/*
 * HTTP protocol analyzer
 *
 * Copyright 2000-2010 Willy Tarreau <w@1wt.eu>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 */

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>

#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <common/appsession.h>
#include <common/base64.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/debug.h>
#include <common/memory.h>
#include <common/mini-clist.h>
#include <common/standard.h>
#include <common/ticks.h>
#include <common/time.h>
#include <common/uri_auth.h>
#include <common/version.h>

#include <types/capture.h>
#include <types/global.h>

#include <proto/acl.h>
#include <proto/auth.h>
#include <proto/backend.h>
#include <proto/buffers.h>
#include <proto/checks.h>
#include <proto/dumpstats.h>
#include <proto/fd.h>
#include <proto/frontend.h>
#include <proto/log.h>
#include <proto/hdr_idx.h>
#include <proto/pattern.h>
#include <proto/proto_tcp.h>
#include <proto/proto_http.h>
#include <proto/proxy.h>
#include <proto/queue.h>
#include <proto/server.h>
#include <proto/session.h>
#include <proto/stream_interface.h>
#include <proto/stream_sock.h>
#include <proto/task.h>

const char HTTP_100[] =
	"HTTP/1.1 100 Continue\r\n\r\n";

const struct chunk http_100_chunk = {
	.str = (char *)&HTTP_100,
	.len = sizeof(HTTP_100)-1
};

/* This is used by remote monitoring */
const char HTTP_200[] =
	"HTTP/1.0 200 OK\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Content-Type: text/html\r\n"
	"\r\n"
	"<html><body><h1>200 OK</h1>\nHAProxy: service ready.\n</body></html>\n";

const struct chunk http_200_chunk = {
	.str = (char *)&HTTP_200,
	.len = sizeof(HTTP_200)-1
};

/* Warning: no "connection" header is provided with the 3xx messages below */
const char *HTTP_301 =
	"HTTP/1.1 301 Moved Permanently\r\n"
	"Cache-Control: no-cache\r\n"
	"Content-length: 0\r\n"
	"Location: "; /* not terminated since it will be concatenated with the URL */

const char *HTTP_302 =
	"HTTP/1.1 302 Found\r\n"
	"Cache-Control: no-cache\r\n"
	"Content-length: 0\r\n"
	"Location: "; /* not terminated since it will be concatenated with the URL */

/* same as 302 except that the browser MUST retry with the GET method */
const char *HTTP_303 =
	"HTTP/1.1 303 See Other\r\n"
	"Cache-Control: no-cache\r\n"
	"Content-length: 0\r\n"
	"Location: "; /* not terminated since it will be concatenated with the URL */

/* Warning: this one is an sprintf() fmt string, with <realm> as its only argument */
const char *HTTP_401_fmt =
	"HTTP/1.0 401 Unauthorized\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Content-Type: text/html\r\n"
	"WWW-Authenticate: Basic realm=\"%s\"\r\n"
	"\r\n"
	"<html><body><h1>401 Unauthorized</h1>\nYou need a valid user and password to access this content.\n</body></html>\n";

const char *HTTP_407_fmt =
	"HTTP/1.0 407 Unauthorized\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Content-Type: text/html\r\n"
	"Proxy-Authenticate: Basic realm=\"%s\"\r\n"
	"\r\n"
	"<html><body><h1>401 Unauthorized</h1>\nYou need a valid user and password to access this content.\n</body></html>\n";


const int http_err_codes[HTTP_ERR_SIZE] = {
	[HTTP_ERR_400] = 400,
	[HTTP_ERR_403] = 403,
	[HTTP_ERR_408] = 408,
	[HTTP_ERR_500] = 500,
	[HTTP_ERR_502] = 502,
	[HTTP_ERR_503] = 503,
	[HTTP_ERR_504] = 504,
};

static const char *http_err_msgs[HTTP_ERR_SIZE] = {
	[HTTP_ERR_400] =
	"HTTP/1.0 400 Bad request\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Content-Type: text/html\r\n"
	"\r\n"
	"<html><body><h1>400 Bad request</h1>\nYour browser sent an invalid request.\n</body></html>\n",

	[HTTP_ERR_403] =
	"HTTP/1.0 403 Forbidden\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Content-Type: text/html\r\n"
	"\r\n"
	"<html><body><h1>403 Forbidden</h1>\nRequest forbidden by administrative rules.\n</body></html>\n",

	[HTTP_ERR_408] =
	"HTTP/1.0 408 Request Time-out\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Content-Type: text/html\r\n"
	"\r\n"
	"<html><body><h1>408 Request Time-out</h1>\nYour browser didn't send a complete request in time.\n</body></html>\n",

	[HTTP_ERR_500] =
	"HTTP/1.0 500 Server Error\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Content-Type: text/html\r\n"
	"\r\n"
	"<html><body><h1>500 Server Error</h1>\nAn internal server error occured.\n</body></html>\n",

	[HTTP_ERR_502] =
	"HTTP/1.0 502 Bad Gateway\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Content-Type: text/html\r\n"
	"\r\n"
	"<html><body><h1>502 Bad Gateway</h1>\nThe server returned an invalid or incomplete response.\n</body></html>\n",

	[HTTP_ERR_503] =
	"HTTP/1.0 503 Service Unavailable\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Content-Type: text/html\r\n"
	"\r\n"
	"<html><body><h1>503 Service Unavailable</h1>\nNo server is available to handle this request.\n</body></html>\n",

	[HTTP_ERR_504] =
	"HTTP/1.0 504 Gateway Time-out\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Content-Type: text/html\r\n"
	"\r\n"
	"<html><body><h1>504 Gateway Time-out</h1>\nThe server didn't respond in time.\n</body></html>\n",

};

/* We must put the messages here since GCC cannot initialize consts depending
 * on strlen().
 */
struct chunk http_err_chunks[HTTP_ERR_SIZE];

#define FD_SETS_ARE_BITFIELDS
#ifdef FD_SETS_ARE_BITFIELDS
/*
 * This map is used with all the FD_* macros to check whether a particular bit
 * is set or not. Each bit represents an ACSII code. FD_SET() sets those bytes
 * which should be encoded. When FD_ISSET() returns non-zero, it means that the
 * byte should be encoded. Be careful to always pass bytes from 0 to 255
 * exclusively to the macros.
 */
fd_set hdr_encode_map[(sizeof(fd_set) > (256/8)) ? 1 : ((256/8) / sizeof(fd_set))];
fd_set url_encode_map[(sizeof(fd_set) > (256/8)) ? 1 : ((256/8) / sizeof(fd_set))];

#else
#error "Check if your OS uses bitfields for fd_sets"
#endif

void init_proto_http()
{
	int i;
	char *tmp;
	int msg;

	for (msg = 0; msg < HTTP_ERR_SIZE; msg++) {
		if (!http_err_msgs[msg]) {
			Alert("Internal error: no message defined for HTTP return code %d. Aborting.\n", msg);
			abort();
		}

		http_err_chunks[msg].str = (char *)http_err_msgs[msg];
		http_err_chunks[msg].len = strlen(http_err_msgs[msg]);
	}

	/* initialize the log header encoding map : '{|}"#' should be encoded with
	 * '#' as prefix, as well as non-printable characters ( <32 or >= 127 ).
	 * URL encoding only requires '"', '#' to be encoded as well as non-
	 * printable characters above.
	 */
	memset(hdr_encode_map, 0, sizeof(hdr_encode_map));
	memset(url_encode_map, 0, sizeof(url_encode_map));
	for (i = 0; i < 32; i++) {
		FD_SET(i, hdr_encode_map);
		FD_SET(i, url_encode_map);
	}
	for (i = 127; i < 256; i++) {
		FD_SET(i, hdr_encode_map);
		FD_SET(i, url_encode_map);
	}

	tmp = "\"#{|}";
	while (*tmp) {
		FD_SET(*tmp, hdr_encode_map);
		tmp++;
	}

	tmp = "\"#";
	while (*tmp) {
		FD_SET(*tmp, url_encode_map);
		tmp++;
	}

	/* memory allocations */
	pool2_requri = create_pool("requri", REQURI_LEN, MEM_F_SHARED);
	pool2_capture = create_pool("capture", CAPTURE_LEN, MEM_F_SHARED);
}

/*
 * We have 26 list of methods (1 per first letter), each of which can have
 * up to 3 entries (2 valid, 1 null).
 */
struct http_method_desc {
	http_meth_t meth;
	int len;
	const char text[8];
};

const struct http_method_desc http_methods[26][3] = {
	['C' - 'A'] = {
		[0] = {	.meth = HTTP_METH_CONNECT , .len=7, .text="CONNECT" },
	},
	['D' - 'A'] = {
		[0] = {	.meth = HTTP_METH_DELETE  , .len=6, .text="DELETE"  },
	},
	['G' - 'A'] = {
		[0] = {	.meth = HTTP_METH_GET     , .len=3, .text="GET"     },
	},
	['H' - 'A'] = {
		[0] = {	.meth = HTTP_METH_HEAD    , .len=4, .text="HEAD"    },
	},
	['P' - 'A'] = {
		[0] = {	.meth = HTTP_METH_POST    , .len=4, .text="POST"    },
		[1] = {	.meth = HTTP_METH_PUT     , .len=3, .text="PUT"     },
	},
	['T' - 'A'] = {
		[0] = {	.meth = HTTP_METH_TRACE   , .len=5, .text="TRACE"   },
	},
	/* rest is empty like this :
	 *      [1] = {	.meth = HTTP_METH_NONE    , .len=0, .text=""        },
	 */
};

/* It is about twice as fast on recent architectures to lookup a byte in a
 * table than to perform a boolean AND or OR between two tests. Refer to
 * RFC2616 for those chars.
 */

const char http_is_spht[256] = {
	[' '] = 1, ['\t'] = 1,
};

const char http_is_crlf[256] = {
	['\r'] = 1, ['\n'] = 1,
};

const char http_is_lws[256] = {
	[' '] = 1, ['\t'] = 1,
	['\r'] = 1, ['\n'] = 1,
};

const char http_is_sep[256] = {
	['('] = 1, [')']  = 1, ['<']  = 1, ['>'] = 1,
	['@'] = 1, [',']  = 1, [';']  = 1, [':'] = 1,
	['"'] = 1, ['/']  = 1, ['[']  = 1, [']'] = 1,
	['{'] = 1, ['}']  = 1, ['?']  = 1, ['='] = 1,
	[' '] = 1, ['\t'] = 1, ['\\'] = 1,
};

const char http_is_ctl[256] = {
	[0 ... 31] = 1,
	[127] = 1,
};

/*
 * A token is any ASCII char that is neither a separator nor a CTL char.
 * Do not overwrite values in assignment since gcc-2.95 will not handle
 * them correctly. Instead, define every non-CTL char's status.
 */
const char http_is_token[256] = {
	[' '] = 0, ['!'] = 1, ['"'] = 0, ['#'] = 1,
	['$'] = 1, ['%'] = 1, ['&'] = 1, ['\''] = 1,
	['('] = 0, [')'] = 0, ['*'] = 1, ['+'] = 1,
	[','] = 0, ['-'] = 1, ['.'] = 1, ['/'] = 0,
	['0'] = 1, ['1'] = 1, ['2'] = 1, ['3'] = 1,
	['4'] = 1, ['5'] = 1, ['6'] = 1, ['7'] = 1,
	['8'] = 1, ['9'] = 1, [':'] = 0, [';'] = 0,
	['<'] = 0, ['='] = 0, ['>'] = 0, ['?'] = 0,
	['@'] = 0, ['A'] = 1, ['B'] = 1, ['C'] = 1,
	['D'] = 1, ['E'] = 1, ['F'] = 1, ['G'] = 1,
	['H'] = 1, ['I'] = 1, ['J'] = 1, ['K'] = 1,
	['L'] = 1, ['M'] = 1, ['N'] = 1, ['O'] = 1,
	['P'] = 1, ['Q'] = 1, ['R'] = 1, ['S'] = 1,
	['T'] = 1, ['U'] = 1, ['V'] = 1, ['W'] = 1,
	['X'] = 1, ['Y'] = 1, ['Z'] = 1, ['['] = 0,
	['\\'] = 0, [']'] = 0, ['^'] = 1, ['_'] = 1,
	['`'] = 1, ['a'] = 1, ['b'] = 1, ['c'] = 1,
	['d'] = 1, ['e'] = 1, ['f'] = 1, ['g'] = 1,
	['h'] = 1, ['i'] = 1, ['j'] = 1, ['k'] = 1,
	['l'] = 1, ['m'] = 1, ['n'] = 1, ['o'] = 1,
	['p'] = 1, ['q'] = 1, ['r'] = 1, ['s'] = 1,
	['t'] = 1, ['u'] = 1, ['v'] = 1, ['w'] = 1,
	['x'] = 1, ['y'] = 1, ['z'] = 1, ['{'] = 0,
	['|'] = 1, ['}'] = 0, ['~'] = 1, 
};


/*
 * An http ver_token is any ASCII which can be found in an HTTP version,
 * which includes 'H', 'T', 'P', '/', '.' and any digit.
 */
const char http_is_ver_token[256] = {
	['.'] = 1, ['/'] = 1,
	['0'] = 1, ['1'] = 1, ['2'] = 1, ['3'] = 1, ['4'] = 1,
	['5'] = 1, ['6'] = 1, ['7'] = 1, ['8'] = 1, ['9'] = 1,
	['H'] = 1, ['P'] = 1, ['T'] = 1,
};


/*
 * Silent debug that outputs only in strace, using fd #-1. Trash is modified.
 */
#if defined(DEBUG_FSM)
static void http_silent_debug(int line, struct session *s)
{
	int size = 0;
	size += snprintf(trash + size, sizeof(trash) - size,
			 "[%04d] req: p=%d(%d) s=%d bf=%08x an=%08x data=%p size=%d l=%d w=%p r=%p lr=%p sm=%d fw=%ld tf=%08x\n",
			 line,
			 s->si[0].state, s->si[0].fd, s->txn.req.msg_state, s->req->flags, s->req->analysers,
			 s->req->data, s->req->size, s->req->l, s->req->w, s->req->r, s->req->lr, s->req->send_max, s->req->to_forward, s->txn.flags);
	write(-1, trash, size);
	size = 0;
	size += snprintf(trash + size, sizeof(trash) - size,
			 " %04d  rep: p=%d(%d) s=%d bf=%08x an=%08x data=%p size=%d l=%d w=%p r=%p lr=%p sm=%d fw=%ld\n",
			 line,
			 s->si[1].state, s->si[1].fd, s->txn.rsp.msg_state, s->rep->flags, s->rep->analysers,
			 s->rep->data, s->rep->size, s->rep->l, s->rep->w, s->rep->r, s->rep->lr, s->rep->send_max, s->rep->to_forward);

	write(-1, trash, size);
}
#else
#define http_silent_debug(l,s)  do { } while (0)
#endif

/*
 * Adds a header and its CRLF at the tail of buffer <b>, just before the last
 * CRLF. Text length is measured first, so it cannot be NULL.
 * The header is also automatically added to the index <hdr_idx>, and the end
 * of headers is automatically adjusted. The number of bytes added is returned
 * on success, otherwise <0 is returned indicating an error.
 */
int http_header_add_tail(struct buffer *b, struct http_msg *msg,
			 struct hdr_idx *hdr_idx, const char *text)
{
	int bytes, len;

	len = strlen(text);
	bytes = buffer_insert_line2(b, b->data + msg->eoh, text, len);
	if (!bytes)
		return -1;
	http_msg_move_end(msg, bytes);
	return hdr_idx_add(len, 1, hdr_idx, hdr_idx->tail);
}

/*
 * Adds a header and its CRLF at the tail of buffer <b>, just before the last
 * CRLF. <len> bytes are copied, not counting the CRLF. If <text> is NULL, then
 * the buffer is only opened and the space reserved, but nothing is copied.
 * The header is also automatically added to the index <hdr_idx>, and the end
 * of headers is automatically adjusted. The number of bytes added is returned
 * on success, otherwise <0 is returned indicating an error.
 */
int http_header_add_tail2(struct buffer *b, struct http_msg *msg,
			 struct hdr_idx *hdr_idx, const char *text, int len)
{
	int bytes;

	bytes = buffer_insert_line2(b, b->data + msg->eoh, text, len);
	if (!bytes)
		return -1;
	http_msg_move_end(msg, bytes);
	return hdr_idx_add(len, 1, hdr_idx, hdr_idx->tail);
}

/*
 * Checks if <hdr> is exactly <name> for <len> chars, and ends with a colon.
 * If so, returns the position of the first non-space character relative to
 * <hdr>, or <end>-<hdr> if not found before. If no value is found, it tries
 * to return a pointer to the place after the first space. Returns 0 if the
 * header name does not match. Checks are case-insensitive.
 */
int http_header_match2(const char *hdr, const char *end,
		       const char *name, int len)
{
	const char *val;

	if (hdr + len >= end)
		return 0;
	if (hdr[len] != ':')
		return 0;
	if (strncasecmp(hdr, name, len) != 0)
		return 0;
	val = hdr + len + 1;
	while (val < end && HTTP_IS_SPHT(*val))
		val++;
	if ((val >= end) && (len + 2 <= end - hdr))
		return len + 2; /* we may replace starting from second space */
	return val - hdr;
}

/* Find the end of the header value contained between <s> and <e>. See RFC2616,
 * par 2.2 for more information. Note that it requires a valid header to return
 * a valid result. This works for headers defined as comma-separated lists.
 */
char *find_hdr_value_end(char *s, const char *e)
{
	int quoted, qdpair;

	quoted = qdpair = 0;
	for (; s < e; s++) {
		if (qdpair)                    qdpair = 0;
		else if (quoted) {
			if (*s == '\\')        qdpair = 1;
			else if (*s == '"')    quoted = 0;
		}
		else if (*s == '"')            quoted = 1;
		else if (*s == ',')            return s;
	}
	return s;
}

/* Find the first or next occurrence of header <name> in message buffer <sol>
 * using headers index <idx>, and return it in the <ctx> structure. This
 * structure holds everything necessary to use the header and find next
 * occurrence. If its <idx> member is 0, the header is searched from the
 * beginning. Otherwise, the next occurrence is returned. The function returns
 * 1 when it finds a value, and 0 when there is no more. It is designed to work
 * with headers defined as comma-separated lists. As a special case, if ctx->val
 * is NULL when searching for a new values of a header, the current header is
 * rescanned. This allows rescanning after a header deletion.
 */
int http_find_header2(const char *name, int len,
		      char *sol, struct hdr_idx *idx,
		      struct hdr_ctx *ctx)
{
	char *eol, *sov;
	int cur_idx, old_idx;

	cur_idx = ctx->idx;
	if (cur_idx) {
		/* We have previously returned a value, let's search
		 * another one on the same line.
		 */
		sol = ctx->line;
		ctx->del = ctx->val + ctx->vlen;
		sov = sol + ctx->del;
		eol = sol + idx->v[cur_idx].len;

		if (sov >= eol)
			/* no more values in this header */
			goto next_hdr;

		/* values remaining for this header, skip the comma but save it
		 * for later use (eg: for header deletion).
		 */
		sov++;
		while (sov < eol && http_is_lws[(unsigned char)*sov])
			sov++;

		goto return_hdr;
	}

	/* first request for this header */
	sol += hdr_idx_first_pos(idx);
	old_idx = 0;
	cur_idx = hdr_idx_first_idx(idx);
	while (cur_idx) {
		eol = sol + idx->v[cur_idx].len;

		if (len == 0) {
			/* No argument was passed, we want any header.
			 * To achieve this, we simply build a fake request. */
			while (sol + len < eol && sol[len] != ':')
				len++;
			name = sol;
		}

		if ((len < eol - sol) &&
		    (sol[len] == ':') &&
		    (strncasecmp(sol, name, len) == 0)) {
			ctx->del = len;
			sov = sol + len + 1;
			while (sov < eol && http_is_lws[(unsigned char)*sov])
				sov++;

			ctx->line = sol;
			ctx->prev = old_idx;
		return_hdr:
			ctx->idx  = cur_idx;
			ctx->val  = sov - sol;

			eol = find_hdr_value_end(sov, eol);
			ctx->vlen = eol - sov;
			return 1;
		}
	next_hdr:
		sol = eol + idx->v[cur_idx].cr + 1;
		old_idx = cur_idx;
		cur_idx = idx->v[cur_idx].next;
	}
	return 0;
}

int http_find_header(const char *name,
		     char *sol, struct hdr_idx *idx,
		     struct hdr_ctx *ctx)
{
	return http_find_header2(name, strlen(name), sol, idx, ctx);
}

/* Remove one value of a header. This only works on a <ctx> returned by one of
 * the http_find_header functions. The value is removed, as well as surrounding
 * commas if any. If the removed value was alone, the whole header is removed.
 * The ctx is always updated accordingly, as well as buffer <buf> and HTTP
 * message <msg>. The new index is returned. If it is zero, it means there is
 * no more header, so any processing may stop. The ctx is always left in a form
 * that can be handled by http_find_header2() to find next occurrence.
 */
int http_remove_header2(struct http_msg *msg, struct buffer *buf,
			struct hdr_idx *idx, struct hdr_ctx *ctx)
{
	int cur_idx = ctx->idx;
	char *sol = ctx->line;
	struct hdr_idx_elem *hdr;
	int delta, skip_comma;

	if (!cur_idx)
		return 0;

	hdr = &idx->v[cur_idx];
	if (sol[ctx->del] == ':' && ctx->val + ctx->vlen == hdr->len) {
		/* This was the only value of the header, we must now remove it entirely. */
		delta = buffer_replace2(buf, sol, sol + hdr->len + hdr->cr + 1, NULL, 0);
		http_msg_move_end(msg, delta);
		idx->used--;
		hdr->len = 0;   /* unused entry */
		idx->v[ctx->prev].next = idx->v[ctx->idx].next;
		if (idx->tail == ctx->idx)
			idx->tail = ctx->prev;
		ctx->idx = ctx->prev;    /* walk back to the end of previous header */
		ctx->line -= idx->v[ctx->idx].len + idx->v[cur_idx].cr + 1;
		ctx->val = idx->v[ctx->idx].len; /* point to end of previous header */
		ctx->vlen = 0;
		return ctx->idx;
	}

	/* This was not the only value of this header. We have to remove between
	 * ctx->del+1 and ctx->val+ctx->vlen+1 included. If it is the last entry
	 * of the list, we remove the last separator.
	 */

	skip_comma = (ctx->val + ctx->vlen == hdr->len) ? 0 : 1;
	delta = buffer_replace2(buf, sol + ctx->del + skip_comma,
				sol + ctx->val + ctx->vlen + skip_comma,
				NULL, 0);
	hdr->len += delta;
	http_msg_move_end(msg, delta);
	ctx->val = ctx->del;
	ctx->vlen = 0;
	return ctx->idx;
}

/* This function handles a server error at the stream interface level. The
 * stream interface is assumed to be already in a closed state. An optional
 * message is copied into the input buffer, and an HTTP status code stored.
 * The error flags are set to the values in arguments. Any pending request
 * in this buffer will be lost.
 */
static void http_server_error(struct session *t, struct stream_interface *si,
			      int err, int finst, int status, const struct chunk *msg)
{
	buffer_auto_read(si->ob);
	buffer_abort(si->ob);
	buffer_auto_close(si->ob);
	buffer_erase(si->ob);
	buffer_auto_close(si->ib);
	buffer_auto_read(si->ib);
	if (status > 0 && msg) {
		t->txn.status = status;
		buffer_write(si->ib, msg->str, msg->len);
	}
	if (!(t->flags & SN_ERR_MASK))
		t->flags |= err;
	if (!(t->flags & SN_FINST_MASK))
		t->flags |= finst;
}

/* This function returns the appropriate error location for the given session
 * and message.
 */

struct chunk *error_message(struct session *s, int msgnum)
{
	if (s->be->errmsg[msgnum].str)
		return &s->be->errmsg[msgnum];
	else if (s->fe->errmsg[msgnum].str)
		return &s->fe->errmsg[msgnum];
	else
		return &http_err_chunks[msgnum];
}

/*
 * returns HTTP_METH_NONE if there is nothing valid to read (empty or non-text
 * string), HTTP_METH_OTHER for unknown methods, or the identified method.
 */
static http_meth_t find_http_meth(const char *str, const int len)
{
	unsigned char m;
	const struct http_method_desc *h;

	m = ((unsigned)*str - 'A');

	if (m < 26) {
		for (h = http_methods[m]; h->len > 0; h++) {
			if (unlikely(h->len != len))
				continue;
			if (likely(memcmp(str, h->text, h->len) == 0))
				return h->meth;
		};
		return HTTP_METH_OTHER;
	}
	return HTTP_METH_NONE;

}

/* Parse the URI from the given transaction (which is assumed to be in request
 * phase) and look for the "/" beginning the PATH. If not found, return NULL.
 * It is returned otherwise.
 */
static char *
http_get_path(struct http_txn *txn)
{
	char *ptr, *end;

	ptr = txn->req.sol + txn->req.sl.rq.u;
	end = ptr + txn->req.sl.rq.u_l;

	if (ptr >= end)
		return NULL;

	/* RFC2616, par. 5.1.2 :
	 * Request-URI = "*" | absuri | abspath | authority
	 */

	if (*ptr == '*')
		return NULL;

	if (isalpha((unsigned char)*ptr)) {
		/* this is a scheme as described by RFC3986, par. 3.1 */
		ptr++;
		while (ptr < end &&
		       (isalnum((unsigned char)*ptr) || *ptr == '+' || *ptr == '-' || *ptr == '.'))
			ptr++;
		/* skip '://' */
		if (ptr == end || *ptr++ != ':')
			return NULL;
		if (ptr == end || *ptr++ != '/')
			return NULL;
		if (ptr == end || *ptr++ != '/')
			return NULL;
	}
	/* skip [user[:passwd]@]host[:[port]] */

	while (ptr < end && *ptr != '/')
		ptr++;

	if (ptr == end)
		return NULL;

	/* OK, we got the '/' ! */
	return ptr;
}

/* Returns a 302 for a redirectable request. This may only be called just after
 * the stream interface has moved to SI_ST_ASS. Unprocessable requests are
 * left unchanged and will follow normal proxy processing.
 */
void perform_http_redirect(struct session *s, struct stream_interface *si)
{
	struct http_txn *txn;
	struct chunk rdr;
	char *path;
	int len;

	/* 1: create the response header */
	rdr.len = strlen(HTTP_302);
	rdr.str = trash;
	rdr.size = sizeof(trash);
	memcpy(rdr.str, HTTP_302, rdr.len);

	/* 2: add the server's prefix */
	if (rdr.len + s->srv->rdr_len > rdr.size)
		return;

	/* special prefix "/" means don't change URL */
	if (s->srv->rdr_len != 1 || *s->srv->rdr_pfx != '/') {
		memcpy(rdr.str + rdr.len, s->srv->rdr_pfx, s->srv->rdr_len);
		rdr.len += s->srv->rdr_len;
	}

	/* 3: add the request URI */
	txn = &s->txn;
	path = http_get_path(txn);
	if (!path)
		return;

	len = txn->req.sl.rq.u_l + (txn->req.sol + txn->req.sl.rq.u) - path;
	if (rdr.len + len > rdr.size - 4) /* 4 for CRLF-CRLF */
		return;

	memcpy(rdr.str + rdr.len, path, len);
	rdr.len += len;

	if (unlikely(txn->flags & TX_USE_PX_CONN)) {
		memcpy(rdr.str + rdr.len, "\r\nProxy-Connection: close\r\n\r\n", 29);
		rdr.len += 29;
	} else {
		memcpy(rdr.str + rdr.len, "\r\nConnection: close\r\n\r\n", 23);
		rdr.len += 23;
	}

	/* prepare to return without error. */
	si->shutr(si);
	si->shutw(si);
	si->err_type = SI_ET_NONE;
	si->err_loc  = NULL;
	si->state    = SI_ST_CLO;

	/* send the message */
	http_server_error(s, si, SN_ERR_PRXCOND, SN_FINST_C, 302, &rdr);

	/* FIXME: we should increase a counter of redirects per server and per backend. */
	if (s->srv)
		srv_inc_sess_ctr(s->srv);
}

/* Return the error message corresponding to si->err_type. It is assumed
 * that the server side is closed. Note that err_type is actually a
 * bitmask, where almost only aborts may be cumulated with other
 * values. We consider that aborted operations are more important
 * than timeouts or errors due to the fact that nobody else in the
 * logs might explain incomplete retries. All others should avoid
 * being cumulated. It should normally not be possible to have multiple
 * aborts at once, but just in case, the first one in sequence is reported.
 */
void http_return_srv_error(struct session *s, struct stream_interface *si)
{
	int err_type = si->err_type;

	if (err_type & SI_ET_QUEUE_ABRT)
		http_server_error(s, si, SN_ERR_CLICL, SN_FINST_Q,
				  503, error_message(s, HTTP_ERR_503));
	else if (err_type & SI_ET_CONN_ABRT)
		http_server_error(s, si, SN_ERR_CLICL, SN_FINST_C,
				  503, error_message(s, HTTP_ERR_503));
	else if (err_type & SI_ET_QUEUE_TO)
		http_server_error(s, si, SN_ERR_SRVTO, SN_FINST_Q,
				  503, error_message(s, HTTP_ERR_503));
	else if (err_type & SI_ET_QUEUE_ERR)
		http_server_error(s, si, SN_ERR_SRVCL, SN_FINST_Q,
				  503, error_message(s, HTTP_ERR_503));
	else if (err_type & SI_ET_CONN_TO)
		http_server_error(s, si, SN_ERR_SRVTO, SN_FINST_C,
				  503, error_message(s, HTTP_ERR_503));
	else if (err_type & SI_ET_CONN_ERR)
		http_server_error(s, si, SN_ERR_SRVCL, SN_FINST_C,
				  503, error_message(s, HTTP_ERR_503));
	else /* SI_ET_CONN_OTHER and others */
		http_server_error(s, si, SN_ERR_INTERNAL, SN_FINST_C,
				  500, error_message(s, HTTP_ERR_500));
}

extern const char sess_term_cond[8];
extern const char sess_fin_state[8];
extern const char *monthname[12];
const char sess_cookie[8]     = "NIDVEO67";	/* No cookie, Invalid cookie, cookie for a Down server, Valid cookie, Expired cookie, Old cookie, unknown */
const char sess_set_cookie[8] = "NPDIRU67";	/* No set-cookie, Set-cookie found and left unchanged (passive),
						   Set-cookie Deleted, Set-Cookie Inserted, Set-cookie Rewritten,
						   Set-cookie Updated, unknown, unknown */
struct pool_head *pool2_requri;
struct pool_head *pool2_capture;

void http_sess_clflog(struct session *s)
{
	char pn[INET6_ADDRSTRLEN];
	struct proxy *fe = s->fe;
	struct proxy *be = s->be;
	struct proxy *prx_log;
	struct http_txn *txn = &s->txn;
	int tolog, level, err;
	char *uri, *h;
	char *svid;
	struct tm tm;
	static char tmpline[MAX_SYSLOG_LEN];
	int hdr;
	size_t w;
	int t_request;

	prx_log = fe;
	err = (s->flags & (SN_ERR_MASK | SN_REDISP)) ||
		(s->req->cons->conn_retries != be->conn_retries) ||
		txn->status >= 500;

	if (s->cli_addr.ss_family == AF_INET)
		inet_ntop(AF_INET,
		          (const void *)&((struct sockaddr_in *)&s->cli_addr)->sin_addr,
		          pn, sizeof(pn));
	else if (s->cli_addr.ss_family == AF_INET6)
		inet_ntop(AF_INET6,
		          (const void *)&((struct sockaddr_in6 *)(&s->cli_addr))->sin6_addr,
		          pn, sizeof(pn));
	else
		snprintf(pn, sizeof(pn), "unix:%d", s->listener->luid);

	get_gmtime(s->logs.accept_date.tv_sec, &tm);

	/* FIXME: let's limit ourselves to frontend logging for now. */
	tolog = fe->to_log;

	h = tmpline;

	w = snprintf(h, sizeof(tmpline),
	             "%s - - [%02d/%s/%04d:%02d:%02d:%02d +0000]",
	             pn,
	             tm.tm_mday, monthname[tm.tm_mon], tm.tm_year+1900,
	             tm.tm_hour, tm.tm_min, tm.tm_sec);
	if (w < 0 || w >= sizeof(tmpline) - (h - tmpline))
		goto trunc;
	h += w;

	if (h >= tmpline + sizeof(tmpline) - 4)
		goto trunc;

	*(h++) = ' ';
	*(h++) = '\"';
	uri = txn->uri ? txn->uri : "<BADREQ>";
	h = encode_string(h, tmpline + sizeof(tmpline) - 1,
	                  '#', url_encode_map, uri);
	*(h++) = '\"';

	w = snprintf(h, sizeof(tmpline) - (h - tmpline), " %d %lld", txn->status, s->logs.bytes_out);
	if (w < 0 || w >= sizeof(tmpline) - (h - tmpline))
		goto trunc;
	h += w;

	if (h >= tmpline + sizeof(tmpline) - 9)
		goto trunc;
	memcpy(h, " \"-\" \"-\"", 8);
	h += 8;

	w = snprintf(h, sizeof(tmpline) - (h - tmpline),
	             " %d %03d",
		     s->cli_addr.ss_family == AF_UNIX ? s->listener->luid :
	                 ntohs((s->cli_addr.ss_family == AF_INET) ?
	                       ((struct sockaddr_in *)&s->cli_addr)->sin_port :
	                       ((struct sockaddr_in6 *)&s->cli_addr)->sin6_port),
	             (int)s->logs.accept_date.tv_usec/1000);
	if (w < 0 || w >= sizeof(tmpline) - (h - tmpline))
		goto trunc;
	h += w;

	w = strlen(fe->id);
	if (h >= tmpline + sizeof(tmpline) - 4 - w)
		goto trunc;
	*(h++) = ' ';
	*(h++) = '\"';
	memcpy(h, fe->id, w);
	h += w;
	*(h++) = '\"';

	w = strlen(be->id);
	if (h >= tmpline + sizeof(tmpline) - 4 - w)
		goto trunc;
	*(h++) = ' ';
	*(h++) = '\"';
	memcpy(h, be->id, w);
	h += w;
	*(h++) = '\"';

	svid = (tolog & LW_SVID) ?
		(s->data_source != DATA_SRC_STATS) ?
		(s->srv != NULL) ? s->srv->id : "<NOSRV>" : "<STATS>" : "-";

	w = strlen(svid);
	if (h >= tmpline + sizeof(tmpline) - 4 - w)
		goto trunc;
	*(h++) = ' ';
	*(h++) = '\"';
	memcpy(h, svid, w);
	h += w;
	*(h++) = '\"';

	t_request = -1;
	if (tv_isge(&s->logs.tv_request, &s->logs.tv_accept))
		t_request = tv_ms_elapsed(&s->logs.tv_accept, &s->logs.tv_request);
	w = snprintf(h, sizeof(tmpline) - (h - tmpline),
	             " %d %ld %ld %ld %ld",
	             t_request,
	             (s->logs.t_queue >= 0) ? s->logs.t_queue - t_request : -1,
	             (s->logs.t_connect >= 0) ? s->logs.t_connect - s->logs.t_queue : -1,
	             (s->logs.t_data >= 0) ? s->logs.t_data - s->logs.t_connect : -1,
	             s->logs.t_close);
	if (w < 0 || w >= sizeof(tmpline) - (h - tmpline))
		goto trunc;
	h += w;

	if (h >= tmpline + sizeof(tmpline) - 8)
		goto trunc;
	*(h++) = ' ';
	*(h++) = '\"';
	*(h++) = sess_term_cond[(s->flags & SN_ERR_MASK) >> SN_ERR_SHIFT];
	*(h++) = sess_fin_state[(s->flags & SN_FINST_MASK) >> SN_FINST_SHIFT];
	*(h++) = (be->options & PR_O_COOK_ANY) ? sess_cookie[(txn->flags & TX_CK_MASK) >> TX_CK_SHIFT] : '-',
	*(h++) = (be->options & PR_O_COOK_ANY) ? sess_set_cookie[(txn->flags & TX_SCK_MASK) >> TX_SCK_SHIFT] : '-';
	*(h++) = '\"';

	w = snprintf(h, sizeof(tmpline) - (h - tmpline),
	             " %d %d %d %d %d %ld %ld",
	             actconn, fe->feconn, be->beconn, s->srv ? s->srv->cur_sess : 0,
	             (s->req->cons->conn_retries > 0) ? (be->conn_retries - s->req->cons->conn_retries) : be->conn_retries,
	             s->logs.srv_queue_size, s->logs.prx_queue_size);

	if (w < 0 || w >= sizeof(tmpline) - (h - tmpline))
		goto trunc;
	h += w;

	if (txn->cli_cookie) {
		w = strlen(txn->cli_cookie);
		if (h >= tmpline + sizeof(tmpline) - 4 - w)
			goto trunc;
		*(h++) = ' ';
		*(h++) = '\"';
		memcpy(h, txn->cli_cookie, w);
		h += w;
		*(h++) = '\"';
	} else {
		if (h >= tmpline + sizeof(tmpline) - 5)
			goto trunc;
		memcpy(h, " \"-\"", 4);
		h += 4;
	}

	if (txn->srv_cookie) {
		w = strlen(txn->srv_cookie);
		if (h >= tmpline + sizeof(tmpline) - 4 - w)
			goto trunc;
		*(h++) = ' ';
		*(h++) = '\"';
		memcpy(h, txn->srv_cookie, w);
		h += w;
		*(h++) = '\"';
	} else {
		if (h >= tmpline + sizeof(tmpline) - 5)
			goto trunc;
		memcpy(h, " \"-\"", 4);
		h += 4;
	}

	if ((fe->to_log & LW_REQHDR) && txn->req.cap) {
		for (hdr = 0; hdr < fe->nb_req_cap; hdr++) {
			if (h >= sizeof (tmpline) + tmpline - 4)
				goto trunc;
			if (txn->req.cap[hdr] != NULL) {
				*(h++) = ' ';
				*(h++) = '\"';
				h = encode_string(h, tmpline + sizeof(tmpline) - 2,
						'#', hdr_encode_map, txn->req.cap[hdr]);
				*(h++) = '\"';
			} else {
				memcpy(h, " \"-\"", 4);
				h += 4;
			}
		}
	}

	if ((fe->to_log & LW_RSPHDR) && txn->rsp.cap) {
		for (hdr = 0; hdr < fe->nb_rsp_cap; hdr++) {
			if (h >= sizeof (tmpline) + tmpline - 4)
				goto trunc;
			if (txn->rsp.cap[hdr] != NULL) {
				*(h++) = ' ';
				*(h++) = '\"';
				h = encode_string(h, tmpline + sizeof(tmpline) - 2,
						'#', hdr_encode_map, txn->rsp.cap[hdr]);
				*(h++) = '\"';
			} else {
				memcpy(h, " \"-\"", 4);
				h += 4;
			}
		}
	}

trunc:
	*h = '\0';

	level = LOG_INFO;
	if (err && (fe->options2 & PR_O2_LOGERRORS))
		level = LOG_ERR;

	send_log(prx_log, level, "%s\n", tmpline);

	s->logs.logwait = 0;
}

/*
 * send a log for the session when we have enough info about it.
 * Will not log if the frontend has no log defined.
 */
void http_sess_log(struct session *s)
{
	char pn[INET6_ADDRSTRLEN];
	struct proxy *fe = s->fe;
	struct proxy *be = s->be;
	struct proxy *prx_log;
	struct http_txn *txn = &s->txn;
	int tolog, level, err;
	char *uri, *h;
	char *svid;
	struct tm tm;
	static char tmpline[MAX_SYSLOG_LEN];
	int t_request;
	int hdr;

	/* if we don't want to log normal traffic, return now */
	err = (s->flags & (SN_ERR_MASK | SN_REDISP)) ||
		(s->req->cons->conn_retries != be->conn_retries) ||
		txn->status >= 500;
	if (!err && (fe->options2 & PR_O2_NOLOGNORM))
		return;

	if (fe->logfac1 < 0 && fe->logfac2 < 0)
		return;
	prx_log = fe;

	if (prx_log->options2 & PR_O2_CLFLOG)
		return http_sess_clflog(s);

	if (s->cli_addr.ss_family == AF_INET)
		inet_ntop(AF_INET,
			  (const void *)&((struct sockaddr_in *)&s->cli_addr)->sin_addr,
			  pn, sizeof(pn));
	else if (s->cli_addr.ss_family == AF_INET6)
		inet_ntop(AF_INET6,
			  (const void *)&((struct sockaddr_in6 *)(&s->cli_addr))->sin6_addr,
			  pn, sizeof(pn));

	get_localtime(s->logs.accept_date.tv_sec, &tm);

	/* FIXME: let's limit ourselves to frontend logging for now. */
	tolog = fe->to_log;

	h = tmpline;
	if (fe->to_log & LW_REQHDR &&
	    txn->req.cap &&
	    (h < tmpline + sizeof(tmpline) - 10)) {
		*(h++) = ' ';
		*(h++) = '{';
		for (hdr = 0; hdr < fe->nb_req_cap; hdr++) {
			if (hdr)
				*(h++) = '|';
			if (txn->req.cap[hdr] != NULL)
				h = encode_string(h, tmpline + sizeof(tmpline) - 7,
						  '#', hdr_encode_map, txn->req.cap[hdr]);
		}
		*(h++) = '}';
	}

	if (fe->to_log & LW_RSPHDR &&
	    txn->rsp.cap &&
	    (h < tmpline + sizeof(tmpline) - 7)) {
		*(h++) = ' ';
		*(h++) = '{';
		for (hdr = 0; hdr < fe->nb_rsp_cap; hdr++) {
			if (hdr)
				*(h++) = '|';
			if (txn->rsp.cap[hdr] != NULL)
				h = encode_string(h, tmpline + sizeof(tmpline) - 4,
						  '#', hdr_encode_map, txn->rsp.cap[hdr]);
		}
		*(h++) = '}';
	}

	if (h < tmpline + sizeof(tmpline) - 4) {
		*(h++) = ' ';
		*(h++) = '"';
		uri = txn->uri ? txn->uri : "<BADREQ>";
		h = encode_string(h, tmpline + sizeof(tmpline) - 1,
				  '#', url_encode_map, uri);
		*(h++) = '"';
	}
	*h = '\0';

	svid = (tolog & LW_SVID) ?
		(s->data_source != DATA_SRC_STATS) ?
		(s->srv != NULL) ? s->srv->id : "<NOSRV>" : "<STATS>" : "-";

	t_request = -1;
	if (tv_isge(&s->logs.tv_request, &s->logs.tv_accept))
		t_request = tv_ms_elapsed(&s->logs.tv_accept, &s->logs.tv_request);

	level = LOG_INFO;
	if (err && (fe->options2 & PR_O2_LOGERRORS))
		level = LOG_ERR;

	send_log(prx_log, level,
		 "%s:%d [%02d/%s/%04d:%02d:%02d:%02d.%03d]"
		 " %s %s/%s %d/%ld/%ld/%ld/%s%ld %d %s%lld"
		 " %s %s %c%c%c%c %d/%d/%d/%d/%s%u %ld/%ld%s\n",
		 (s->cli_addr.ss_family == AF_UNIX) ? "unix" : pn,
		 (s->cli_addr.ss_family == AF_UNIX) ? s->listener->luid :
		     ntohs((s->cli_addr.ss_family == AF_INET) ?
		           ((struct sockaddr_in *)&s->cli_addr)->sin_port :
		           ((struct sockaddr_in6 *)&s->cli_addr)->sin6_port),
		 tm.tm_mday, monthname[tm.tm_mon], tm.tm_year+1900,
		 tm.tm_hour, tm.tm_min, tm.tm_sec, (int)s->logs.accept_date.tv_usec/1000,
		 fe->id, be->id, svid,
		 t_request,
		 (s->logs.t_queue >= 0) ? s->logs.t_queue - t_request : -1,
		 (s->logs.t_connect >= 0) ? s->logs.t_connect - s->logs.t_queue : -1,
		 (s->logs.t_data >= 0) ? s->logs.t_data - s->logs.t_connect : -1,
		 (tolog & LW_BYTES) ? "" : "+", s->logs.t_close,
		 txn->status,
		 (tolog & LW_BYTES) ? "" : "+", s->logs.bytes_out,
		 txn->cli_cookie ? txn->cli_cookie : "-",
		 txn->srv_cookie ? txn->srv_cookie : "-",
		 sess_term_cond[(s->flags & SN_ERR_MASK) >> SN_ERR_SHIFT],
		 sess_fin_state[(s->flags & SN_FINST_MASK) >> SN_FINST_SHIFT],
		 (be->options & PR_O_COOK_ANY) ? sess_cookie[(txn->flags & TX_CK_MASK) >> TX_CK_SHIFT] : '-',
		 (be->options & PR_O_COOK_ANY) ? sess_set_cookie[(txn->flags & TX_SCK_MASK) >> TX_SCK_SHIFT] : '-',
		 actconn, fe->feconn, be->beconn, s->srv ? s->srv->cur_sess : 0,
		 (s->flags & SN_REDISP)?"+":"",
		 (s->req->cons->conn_retries>0)?(be->conn_retries - s->req->cons->conn_retries):be->conn_retries,
		 s->logs.srv_queue_size, s->logs.prx_queue_size, tmpline);

	s->logs.logwait = 0;
}


/*
 * Capture headers from message starting at <som> according to header list
 * <cap_hdr>, and fill the <idx> structure appropriately.
 */
void capture_headers(char *som, struct hdr_idx *idx,
		     char **cap, struct cap_hdr *cap_hdr)
{
	char *eol, *sol, *col, *sov;
	int cur_idx;
	struct cap_hdr *h;
	int len;

	sol = som + hdr_idx_first_pos(idx);
	cur_idx = hdr_idx_first_idx(idx);

	while (cur_idx) {
		eol = sol + idx->v[cur_idx].len;

		col = sol;
		while (col < eol && *col != ':')
			col++;

		sov = col + 1;
		while (sov < eol && http_is_lws[(unsigned char)*sov])
			sov++;
				
		for (h = cap_hdr; h; h = h->next) {
			if ((h->namelen == col - sol) &&
			    (strncasecmp(sol, h->name, h->namelen) == 0)) {
				if (cap[h->index] == NULL)
					cap[h->index] =
						pool_alloc2(h->pool);

				if (cap[h->index] == NULL) {
					Alert("HTTP capture : out of memory.\n");
					continue;
				}
							
				len = eol - sov;
				if (len > h->len)
					len = h->len;
							
				memcpy(cap[h->index], sov, len);
				cap[h->index][len]=0;
			}
		}
		sol = eol + idx->v[cur_idx].cr + 1;
		cur_idx = idx->v[cur_idx].next;
	}
}


/* either we find an LF at <ptr> or we jump to <bad>.
 */
#define EXPECT_LF_HERE(ptr, bad)	do { if (unlikely(*(ptr) != '\n')) goto bad; } while (0)

/* plays with variables <ptr>, <end> and <state>. Jumps to <good> if OK,
 * otherwise to <http_msg_ood> with <state> set to <st>.
 */
#define EAT_AND_JUMP_OR_RETURN(good, st)   do { \
		ptr++;                          \
		if (likely(ptr < end))          \
			goto good;              \
		else {                          \
			state = (st);           \
			goto http_msg_ood;      \
		}                               \
	} while (0)


/*
 * This function parses a status line between <ptr> and <end>, starting with
 * parser state <state>. Only states HTTP_MSG_RPVER, HTTP_MSG_RPVER_SP,
 * HTTP_MSG_RPCODE, HTTP_MSG_RPCODE_SP and HTTP_MSG_RPREASON are handled. Others
 * will give undefined results.
 * Note that it is upon the caller's responsibility to ensure that ptr < end,
 * and that msg->sol points to the beginning of the response.
 * If a complete line is found (which implies that at least one CR or LF is
 * found before <end>, the updated <ptr> is returned, otherwise NULL is
 * returned indicating an incomplete line (which does not mean that parts have
 * not been updated). In the incomplete case, if <ret_ptr> or <ret_state> are
 * non-NULL, they are fed with the new <ptr> and <state> values to be passed
 * upon next call.
 *
 * This function was intentionally designed to be called from
 * http_msg_analyzer() with the lowest overhead. It should integrate perfectly
 * within its state machine and use the same macros, hence the need for same
 * labels and variable names. Note that msg->sol is left unchanged.
 */
const char *http_parse_stsline(struct http_msg *msg, const char *msg_buf,
			       unsigned int state, const char *ptr, const char *end,
			       char **ret_ptr, unsigned int *ret_state)
{
	switch (state)	{
	case HTTP_MSG_RPVER:
	http_msg_rpver:
		if (likely(HTTP_IS_VER_TOKEN(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_rpver, HTTP_MSG_RPVER);

		if (likely(HTTP_IS_SPHT(*ptr))) {
			msg->sl.st.v_l = (ptr - msg_buf) - msg->som;
			EAT_AND_JUMP_OR_RETURN(http_msg_rpver_sp, HTTP_MSG_RPVER_SP);
		}
		state = HTTP_MSG_ERROR;
		break;

	case HTTP_MSG_RPVER_SP:
	http_msg_rpver_sp:
		if (likely(!HTTP_IS_LWS(*ptr))) {
			msg->sl.st.c = (ptr - msg_buf) - msg->som;
			goto http_msg_rpcode;
		}
		if (likely(HTTP_IS_SPHT(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_rpver_sp, HTTP_MSG_RPVER_SP);
		/* so it's a CR/LF, this is invalid */
		state = HTTP_MSG_ERROR;
		break;

	case HTTP_MSG_RPCODE:
	http_msg_rpcode:
		if (likely(!HTTP_IS_LWS(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_rpcode, HTTP_MSG_RPCODE);

		if (likely(HTTP_IS_SPHT(*ptr))) {
			msg->sl.st.c_l = (ptr - msg_buf) - msg->som - msg->sl.st.c;
			EAT_AND_JUMP_OR_RETURN(http_msg_rpcode_sp, HTTP_MSG_RPCODE_SP);
		}

		/* so it's a CR/LF, so there is no reason phrase */
		msg->sl.st.c_l = (ptr - msg_buf) - msg->som - msg->sl.st.c;
	http_msg_rsp_reason:
		/* FIXME: should we support HTTP responses without any reason phrase ? */
		msg->sl.st.r = (ptr - msg_buf) - msg->som;
		msg->sl.st.r_l = 0;
		goto http_msg_rpline_eol;

	case HTTP_MSG_RPCODE_SP:
	http_msg_rpcode_sp:
		if (likely(!HTTP_IS_LWS(*ptr))) {
			msg->sl.st.r = (ptr - msg_buf) - msg->som;
			goto http_msg_rpreason;
		}
		if (likely(HTTP_IS_SPHT(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_rpcode_sp, HTTP_MSG_RPCODE_SP);
		/* so it's a CR/LF, so there is no reason phrase */
		goto http_msg_rsp_reason;

	case HTTP_MSG_RPREASON:
	http_msg_rpreason:
		if (likely(!HTTP_IS_CRLF(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_rpreason, HTTP_MSG_RPREASON);
		msg->sl.st.r_l = (ptr - msg_buf) - msg->som - msg->sl.st.r;
	http_msg_rpline_eol:
		/* We have seen the end of line. Note that we do not
		 * necessarily have the \n yet, but at least we know that we
		 * have EITHER \r OR \n, otherwise the response would not be
		 * complete. We can then record the response length and return
		 * to the caller which will be able to register it.
		 */
		msg->sl.st.l = ptr - msg->sol;
		return ptr;

#ifdef DEBUG_FULL
	default:
		fprintf(stderr, "FIXME !!!! impossible state at %s:%d = %d\n", __FILE__, __LINE__, state);
		exit(1);
#endif
	}

 http_msg_ood:
	/* out of valid data */
	if (ret_state)
		*ret_state = state;
	if (ret_ptr)
		*ret_ptr = (char *)ptr;
	return NULL;
}

/*
 * This function parses a request line between <ptr> and <end>, starting with
 * parser state <state>. Only states HTTP_MSG_RQMETH, HTTP_MSG_RQMETH_SP,
 * HTTP_MSG_RQURI, HTTP_MSG_RQURI_SP and HTTP_MSG_RQVER are handled. Others
 * will give undefined results.
 * Note that it is upon the caller's responsibility to ensure that ptr < end,
 * and that msg->sol points to the beginning of the request.
 * If a complete line is found (which implies that at least one CR or LF is
 * found before <end>, the updated <ptr> is returned, otherwise NULL is
 * returned indicating an incomplete line (which does not mean that parts have
 * not been updated). In the incomplete case, if <ret_ptr> or <ret_state> are
 * non-NULL, they are fed with the new <ptr> and <state> values to be passed
 * upon next call.
 *
 * This function was intentionally designed to be called from
 * http_msg_analyzer() with the lowest overhead. It should integrate perfectly
 * within its state machine and use the same macros, hence the need for same
 * labels and variable names. Note that msg->sol is left unchanged.
 */
const char *http_parse_reqline(struct http_msg *msg, const char *msg_buf,
			       unsigned int state, const char *ptr, const char *end,
			       char **ret_ptr, unsigned int *ret_state)
{
	switch (state)	{
	case HTTP_MSG_RQMETH:
	http_msg_rqmeth:
		if (likely(HTTP_IS_TOKEN(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_rqmeth, HTTP_MSG_RQMETH);

		if (likely(HTTP_IS_SPHT(*ptr))) {
			msg->sl.rq.m_l = (ptr - msg_buf) - msg->som;
			EAT_AND_JUMP_OR_RETURN(http_msg_rqmeth_sp, HTTP_MSG_RQMETH_SP);
		}

		if (likely(HTTP_IS_CRLF(*ptr))) {
			/* HTTP 0.9 request */
			msg->sl.rq.m_l = (ptr - msg_buf) - msg->som;
		http_msg_req09_uri:
			msg->sl.rq.u = (ptr - msg_buf) - msg->som;
		http_msg_req09_uri_e:
			msg->sl.rq.u_l = (ptr - msg_buf) - msg->som - msg->sl.rq.u;
		http_msg_req09_ver:
			msg->sl.rq.v = (ptr - msg_buf) - msg->som;
			msg->sl.rq.v_l = 0;
			goto http_msg_rqline_eol;
		}
		state = HTTP_MSG_ERROR;
		break;

	case HTTP_MSG_RQMETH_SP:
	http_msg_rqmeth_sp:
		if (likely(!HTTP_IS_LWS(*ptr))) {
			msg->sl.rq.u = (ptr - msg_buf) - msg->som;
			goto http_msg_rquri;
		}
		if (likely(HTTP_IS_SPHT(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_rqmeth_sp, HTTP_MSG_RQMETH_SP);
		/* so it's a CR/LF, meaning an HTTP 0.9 request */
		goto http_msg_req09_uri;

	case HTTP_MSG_RQURI:
	http_msg_rquri:
		if (likely(!HTTP_IS_LWS(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_rquri, HTTP_MSG_RQURI);

		if (likely(HTTP_IS_SPHT(*ptr))) {
			msg->sl.rq.u_l = (ptr - msg_buf) - msg->som - msg->sl.rq.u;
			EAT_AND_JUMP_OR_RETURN(http_msg_rquri_sp, HTTP_MSG_RQURI_SP);
		}

		/* so it's a CR/LF, meaning an HTTP 0.9 request */
		goto http_msg_req09_uri_e;

	case HTTP_MSG_RQURI_SP:
	http_msg_rquri_sp:
		if (likely(!HTTP_IS_LWS(*ptr))) {
			msg->sl.rq.v = (ptr - msg_buf) - msg->som;
			goto http_msg_rqver;
		}
		if (likely(HTTP_IS_SPHT(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_rquri_sp, HTTP_MSG_RQURI_SP);
		/* so it's a CR/LF, meaning an HTTP 0.9 request */
		goto http_msg_req09_ver;

	case HTTP_MSG_RQVER:
	http_msg_rqver:
		if (likely(HTTP_IS_VER_TOKEN(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_rqver, HTTP_MSG_RQVER);

		if (likely(HTTP_IS_CRLF(*ptr))) {
			msg->sl.rq.v_l = (ptr - msg_buf) - msg->som - msg->sl.rq.v;
		http_msg_rqline_eol:
			/* We have seen the end of line. Note that we do not
			 * necessarily have the \n yet, but at least we know that we
			 * have EITHER \r OR \n, otherwise the request would not be
			 * complete. We can then record the request length and return
			 * to the caller which will be able to register it.
			 */
			msg->sl.rq.l = ptr - msg->sol;
			return ptr;
		}

		/* neither an HTTP_VER token nor a CRLF */
		state = HTTP_MSG_ERROR;
		break;

#ifdef DEBUG_FULL
	default:
		fprintf(stderr, "FIXME !!!! impossible state at %s:%d = %d\n", __FILE__, __LINE__, state);
		exit(1);
#endif
	}

 http_msg_ood:
	/* out of valid data */
	if (ret_state)
		*ret_state = state;
	if (ret_ptr)
		*ret_ptr = (char *)ptr;
	return NULL;
}

/*
 * Returns the data from Authorization header. Function may be called more
 * than once so data is stored in txn->auth_data. When no header is found
 * or auth method is unknown auth_method is set to HTTP_AUTH_WRONG to avoid
 * searching again for something we are unable to find anyway.
 */

char get_http_auth_buff[BUFSIZE];

int
get_http_auth(struct session *s)
{

	struct http_txn *txn = &s->txn;
	struct chunk auth_method;
	struct hdr_ctx ctx;
	char *h, *p;
	int len;

#ifdef DEBUG_AUTH
	printf("Auth for session %p: %d\n", s, txn->auth.method);
#endif

	if (txn->auth.method == HTTP_AUTH_WRONG)
		return 0;

	if (txn->auth.method)
		return 1;

	txn->auth.method = HTTP_AUTH_WRONG;

	ctx.idx = 0;

	if (txn->flags & TX_USE_PX_CONN) {
		h = "Proxy-Authorization";
		len = strlen(h);
	} else {
		h = "Authorization";
		len = strlen(h);
	}

	if (!http_find_header2(h, len, txn->req.sol, &txn->hdr_idx, &ctx))
		return 0;

	h = ctx.line + ctx.val;

	p = memchr(h, ' ', ctx.vlen);
	if (!p || p == h)
		return 0;

	chunk_initlen(&auth_method, h, 0, p-h);
	chunk_initlen(&txn->auth.method_data, p+1, 0, ctx.vlen-(p-h)-1);

	if (!strncasecmp("Basic", auth_method.str, auth_method.len)) {

		len = base64dec(txn->auth.method_data.str, txn->auth.method_data.len,
				get_http_auth_buff, BUFSIZE - 1);

		if (len < 0)
			return 0;


		get_http_auth_buff[len] = '\0';

		p = strchr(get_http_auth_buff, ':');

		if (!p)
			return 0;

		txn->auth.user = get_http_auth_buff;
		*p = '\0';
		txn->auth.pass = p+1;

		txn->auth.method = HTTP_AUTH_BASIC;
		return 1;
	}

	return 0;
}


/*
 * This function parses an HTTP message, either a request or a response,
 * depending on the initial msg->msg_state. It can be preempted everywhere
 * when data are missing and recalled at the exact same location with no
 * information loss. The header index is re-initialized when switching from
 * MSG_R[PQ]BEFORE to MSG_RPVER|MSG_RQMETH. It modifies msg->sol among other
 * fields. Note that msg->som and msg->sol will be initialized after completing
 * the first state, so that none of the msg pointers has to be initialized
 * prior to the first call.
 */
void http_msg_analyzer(struct buffer *buf, struct http_msg *msg, struct hdr_idx *idx)
{
	unsigned int state;       /* updated only when leaving the FSM */
	register char *ptr, *end; /* request pointers, to avoid dereferences */

	state = msg->msg_state;
	ptr = buf->lr;
	end = buf->r;

	if (unlikely(ptr >= end))
		goto http_msg_ood;

	switch (state)	{
	/*
	 * First, states that are specific to the response only.
	 * We check them first so that request and headers are
	 * closer to each other (accessed more often).
	 */
	case HTTP_MSG_RPBEFORE:
	http_msg_rpbefore:
		if (likely(HTTP_IS_TOKEN(*ptr))) {
			/* we have a start of message, but we have to check
			 * first if we need to remove some CRLF. We can only
			 * do this when send_max=0.
			 */
			char *beg = buf->w + buf->send_max;
			if (beg >= buf->data + buf->size)
				beg -= buf->size;
			if (unlikely(ptr != beg)) {
				if (buf->send_max)
					goto http_msg_ood;
				/* Remove empty leading lines, as recommended by RFC2616. */
				buffer_ignore(buf, ptr - beg);
			}
			msg->som = ptr - buf->data;
			msg->sol = ptr;
			hdr_idx_init(idx);
			state = HTTP_MSG_RPVER;
			goto http_msg_rpver;
		}

		if (unlikely(!HTTP_IS_CRLF(*ptr)))
			goto http_msg_invalid;

		if (unlikely(*ptr == '\n'))
			EAT_AND_JUMP_OR_RETURN(http_msg_rpbefore, HTTP_MSG_RPBEFORE);
		EAT_AND_JUMP_OR_RETURN(http_msg_rpbefore_cr, HTTP_MSG_RPBEFORE_CR);
		/* stop here */

	case HTTP_MSG_RPBEFORE_CR:
	http_msg_rpbefore_cr:
		EXPECT_LF_HERE(ptr, http_msg_invalid);
		EAT_AND_JUMP_OR_RETURN(http_msg_rpbefore, HTTP_MSG_RPBEFORE);
		/* stop here */

	case HTTP_MSG_RPVER:
	http_msg_rpver:
	case HTTP_MSG_RPVER_SP:
	case HTTP_MSG_RPCODE:
	case HTTP_MSG_RPCODE_SP:
	case HTTP_MSG_RPREASON:
		ptr = (char *)http_parse_stsline(msg, buf->data, state, ptr, end,
						 &buf->lr, &msg->msg_state);
		if (unlikely(!ptr))
			return;

		/* we have a full response and we know that we have either a CR
		 * or an LF at <ptr>.
		 */
		//fprintf(stderr,"som=%d rq.l=%d *ptr=0x%02x\n", msg->som, msg->sl.st.l, *ptr);
		hdr_idx_set_start(idx, msg->sl.st.l, *ptr == '\r');

		msg->sol = ptr;
		if (likely(*ptr == '\r'))
			EAT_AND_JUMP_OR_RETURN(http_msg_rpline_end, HTTP_MSG_RPLINE_END);
		goto http_msg_rpline_end;

	case HTTP_MSG_RPLINE_END:
	http_msg_rpline_end:
		/* msg->sol must point to the first of CR or LF. */
		EXPECT_LF_HERE(ptr, http_msg_invalid);
		EAT_AND_JUMP_OR_RETURN(http_msg_hdr_first, HTTP_MSG_HDR_FIRST);
		/* stop here */

	/*
	 * Second, states that are specific to the request only
	 */
	case HTTP_MSG_RQBEFORE:
	http_msg_rqbefore:
		if (likely(HTTP_IS_TOKEN(*ptr))) {
			/* we have a start of message, but we have to check
			 * first if we need to remove some CRLF. We can only
			 * do this when send_max=0.
			 */
			char *beg = buf->w + buf->send_max;
			if (beg >= buf->data + buf->size)
				beg -= buf->size;
			if (likely(ptr != beg)) {
				if (buf->send_max)
					goto http_msg_ood;
				/* Remove empty leading lines, as recommended by RFC2616. */
				buffer_ignore(buf, ptr - beg);
			}
			msg->som = ptr - buf->data;
			msg->sol = ptr;
			/* we will need this when keep-alive will be supported
			   hdr_idx_init(idx);
			 */
			state = HTTP_MSG_RQMETH;
			goto http_msg_rqmeth;
		}

		if (unlikely(!HTTP_IS_CRLF(*ptr)))
			goto http_msg_invalid;

		if (unlikely(*ptr == '\n'))
			EAT_AND_JUMP_OR_RETURN(http_msg_rqbefore, HTTP_MSG_RQBEFORE);
		EAT_AND_JUMP_OR_RETURN(http_msg_rqbefore_cr, HTTP_MSG_RQBEFORE_CR);
		/* stop here */

	case HTTP_MSG_RQBEFORE_CR:
	http_msg_rqbefore_cr:
		EXPECT_LF_HERE(ptr, http_msg_invalid);
		EAT_AND_JUMP_OR_RETURN(http_msg_rqbefore, HTTP_MSG_RQBEFORE);
		/* stop here */

	case HTTP_MSG_RQMETH:
	http_msg_rqmeth:
	case HTTP_MSG_RQMETH_SP:
	case HTTP_MSG_RQURI:
	case HTTP_MSG_RQURI_SP:
	case HTTP_MSG_RQVER:
		ptr = (char *)http_parse_reqline(msg, buf->data, state, ptr, end,
						 &buf->lr, &msg->msg_state);
		if (unlikely(!ptr))
			return;

		/* we have a full request and we know that we have either a CR
		 * or an LF at <ptr>.
		 */
		//fprintf(stderr,"som=%d rq.l=%d *ptr=0x%02x\n", msg->som, msg->sl.rq.l, *ptr);
		hdr_idx_set_start(idx, msg->sl.rq.l, *ptr == '\r');

		msg->sol = ptr;
		if (likely(*ptr == '\r'))
			EAT_AND_JUMP_OR_RETURN(http_msg_rqline_end, HTTP_MSG_RQLINE_END);
		goto http_msg_rqline_end;

	case HTTP_MSG_RQLINE_END:
	http_msg_rqline_end:
		/* check for HTTP/0.9 request : no version information available.
		 * msg->sol must point to the first of CR or LF.
		 */
		if (unlikely(msg->sl.rq.v_l == 0))
			goto http_msg_last_lf;

		EXPECT_LF_HERE(ptr, http_msg_invalid);
		EAT_AND_JUMP_OR_RETURN(http_msg_hdr_first, HTTP_MSG_HDR_FIRST);
		/* stop here */

	/*
	 * Common states below
	 */
	case HTTP_MSG_HDR_FIRST:
	http_msg_hdr_first:
		msg->sol = ptr;
		if (likely(!HTTP_IS_CRLF(*ptr))) {
			goto http_msg_hdr_name;
		}
		
		if (likely(*ptr == '\r'))
			EAT_AND_JUMP_OR_RETURN(http_msg_last_lf, HTTP_MSG_LAST_LF);
		goto http_msg_last_lf;

	case HTTP_MSG_HDR_NAME:
	http_msg_hdr_name:
		/* assumes msg->sol points to the first char */
		if (likely(HTTP_IS_TOKEN(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_hdr_name, HTTP_MSG_HDR_NAME);

		if (likely(*ptr == ':')) {
			msg->col = ptr - buf->data;
			EAT_AND_JUMP_OR_RETURN(http_msg_hdr_l1_sp, HTTP_MSG_HDR_L1_SP);
		}

		if (likely(msg->err_pos < -1) || *ptr == '\n')
			goto http_msg_invalid;

		if (msg->err_pos == -1) /* capture error pointer */
			msg->err_pos = ptr - buf->data; /* >= 0 now */

		/* and we still accept this non-token character */
		EAT_AND_JUMP_OR_RETURN(http_msg_hdr_name, HTTP_MSG_HDR_NAME);

	case HTTP_MSG_HDR_L1_SP:
	http_msg_hdr_l1_sp:
		/* assumes msg->sol points to the first char and msg->col to the colon */
		if (likely(HTTP_IS_SPHT(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_hdr_l1_sp, HTTP_MSG_HDR_L1_SP);

		/* header value can be basically anything except CR/LF */
		msg->sov = ptr - buf->data;

		if (likely(!HTTP_IS_CRLF(*ptr))) {
			goto http_msg_hdr_val;
		}
			
		if (likely(*ptr == '\r'))
			EAT_AND_JUMP_OR_RETURN(http_msg_hdr_l1_lf, HTTP_MSG_HDR_L1_LF);
		goto http_msg_hdr_l1_lf;

	case HTTP_MSG_HDR_L1_LF:
	http_msg_hdr_l1_lf:
		EXPECT_LF_HERE(ptr, http_msg_invalid);
		EAT_AND_JUMP_OR_RETURN(http_msg_hdr_l1_lws, HTTP_MSG_HDR_L1_LWS);

	case HTTP_MSG_HDR_L1_LWS:
	http_msg_hdr_l1_lws:
		if (likely(HTTP_IS_SPHT(*ptr))) {
			/* replace HT,CR,LF with spaces */
			for (; buf->data+msg->sov < ptr; msg->sov++)
				buf->data[msg->sov] = ' ';
			goto http_msg_hdr_l1_sp;
		}
		/* we had a header consisting only in spaces ! */
		msg->eol = buf->data + msg->sov;
		goto http_msg_complete_header;
		
	case HTTP_MSG_HDR_VAL:
	http_msg_hdr_val:
		/* assumes msg->sol points to the first char, msg->col to the
		 * colon, and msg->sov points to the first character of the
		 * value.
		 */
		if (likely(!HTTP_IS_CRLF(*ptr)))
			EAT_AND_JUMP_OR_RETURN(http_msg_hdr_val, HTTP_MSG_HDR_VAL);

		msg->eol = ptr;
		/* Note: we could also copy eol into ->eoh so that we have the
		 * real header end in case it ends with lots of LWS, but is this
		 * really needed ?
		 */
		if (likely(*ptr == '\r'))
			EAT_AND_JUMP_OR_RETURN(http_msg_hdr_l2_lf, HTTP_MSG_HDR_L2_LF);
		goto http_msg_hdr_l2_lf;

	case HTTP_MSG_HDR_L2_LF:
	http_msg_hdr_l2_lf:
		EXPECT_LF_HERE(ptr, http_msg_invalid);
		EAT_AND_JUMP_OR_RETURN(http_msg_hdr_l2_lws, HTTP_MSG_HDR_L2_LWS);

	case HTTP_MSG_HDR_L2_LWS:
	http_msg_hdr_l2_lws:
		if (unlikely(HTTP_IS_SPHT(*ptr))) {
			/* LWS: replace HT,CR,LF with spaces */
			for (; msg->eol < ptr; msg->eol++)
				*msg->eol = ' ';
			goto http_msg_hdr_val;
		}
	http_msg_complete_header:
		/*
		 * It was a new header, so the last one is finished.
		 * Assumes msg->sol points to the first char, msg->col to the
		 * colon, msg->sov points to the first character of the value
		 * and msg->eol to the first CR or LF so we know how the line
		 * ends. We insert last header into the index.
		 */
		/*
		  fprintf(stderr,"registering %-2d bytes : ", msg->eol - msg->sol);
		  write(2, msg->sol, msg->eol-msg->sol);
		  fprintf(stderr,"\n");
		*/

		if (unlikely(hdr_idx_add(msg->eol - msg->sol, *msg->eol == '\r',
					 idx, idx->tail) < 0))
			goto http_msg_invalid;

		msg->sol = ptr;
		if (likely(!HTTP_IS_CRLF(*ptr))) {
			goto http_msg_hdr_name;
		}
		
		if (likely(*ptr == '\r'))
			EAT_AND_JUMP_OR_RETURN(http_msg_last_lf, HTTP_MSG_LAST_LF);
		goto http_msg_last_lf;

	case HTTP_MSG_LAST_LF:
	http_msg_last_lf:
		/* Assumes msg->sol points to the first of either CR or LF */
		EXPECT_LF_HERE(ptr, http_msg_invalid);
		ptr++;
		buf->lr = ptr;
		msg->col = msg->sov = buf->lr - buf->data;
		msg->eoh = msg->sol - buf->data;
		msg->sol = buf->data + msg->som;
		msg->msg_state = HTTP_MSG_BODY;
		return;
#ifdef DEBUG_FULL
	default:
		fprintf(stderr, "FIXME !!!! impossible state at %s:%d = %d\n", __FILE__, __LINE__, state);
		exit(1);
#endif
	}
 http_msg_ood:
	/* out of data */
	msg->msg_state = state;
	buf->lr = ptr;
	return;

 http_msg_invalid:
	/* invalid message */
	msg->msg_state = HTTP_MSG_ERROR;
	buf->lr = ptr;
	return;
}

/* convert an HTTP/0.9 request into an HTTP/1.0 request. Returns 1 if the
 * conversion succeeded, 0 in case of error. If the request was already 1.X,
 * nothing is done and 1 is returned.
 */
static int http_upgrade_v09_to_v10(struct buffer *req, struct http_msg *msg, struct http_txn *txn)
{
	int delta;
	char *cur_end;

	if (msg->sl.rq.v_l != 0)
		return 1;

	cur_end = msg->sol + msg->sl.rq.l;
	delta = 0;

	if (msg->sl.rq.u_l == 0) {
		/* if no URI was set, add "/" */
		delta = buffer_replace2(req, cur_end, cur_end, " /", 2);
		cur_end += delta;
		http_msg_move_end(msg, delta);
	}
	/* add HTTP version */
	delta = buffer_replace2(req, cur_end, cur_end, " HTTP/1.0\r\n", 11);
	http_msg_move_end(msg, delta);
	cur_end += delta;
	cur_end = (char *)http_parse_reqline(msg, req->data,
					     HTTP_MSG_RQMETH,
					     msg->sol, cur_end + 1,
					     NULL, NULL);
	if (unlikely(!cur_end))
		return 0;

	/* we have a full HTTP/1.0 request now and we know that
	 * we have either a CR or an LF at <ptr>.
	 */
	hdr_idx_set_start(&txn->hdr_idx, msg->sl.rq.l, *cur_end == '\r');
	return 1;
}

/* Parse the Connection: header of an HTTP request, looking for both "close"
 * and "keep-alive" values. If a buffer is provided and we already know that
 * some headers may safely be removed, we remove them now. The <to_del> flags
 * are used for that :
 *  - bit 0 means remove "close" headers (in HTTP/1.0 requests/responses)
 *  - bit 1 means remove "keep-alive" headers (in HTTP/1.1 reqs/resp to 1.1).
 * The TX_HDR_CONN_* flags are adjusted in txn->flags depending on what was
 * found, and TX_CON_*_SET is adjusted depending on what is left so only
 * harmless combinations may be removed. Do not call that after changes have
 * been processed. If unused, the buffer can be NULL, and no data will be
 * changed.
 */
void http_parse_connection_header(struct http_txn *txn, struct http_msg *msg, struct buffer *buf, int to_del)
{
	struct hdr_ctx ctx;
	const char *hdr_val = "Connection";
	int hdr_len = 10;

	if (txn->flags & TX_HDR_CONN_PRS)
		return;

	if (unlikely(txn->flags & TX_USE_PX_CONN)) {
		hdr_val = "Proxy-Connection";
		hdr_len = 16;
	}

	ctx.idx = 0;
	txn->flags &= ~(TX_CON_KAL_SET|TX_CON_CLO_SET);
	while (http_find_header2(hdr_val, hdr_len, msg->sol, &txn->hdr_idx, &ctx)) {
		if (ctx.vlen >= 10 && word_match(ctx.line + ctx.val, ctx.vlen, "keep-alive", 10)) {
			txn->flags |= TX_HDR_CONN_KAL;
			if ((to_del & 2) && buf)
				http_remove_header2(msg, buf, &txn->hdr_idx, &ctx);
			else
				txn->flags |= TX_CON_KAL_SET;
		}
		else if (ctx.vlen >= 5 && word_match(ctx.line + ctx.val, ctx.vlen, "close", 5)) {
			txn->flags |= TX_HDR_CONN_CLO;
			if ((to_del & 1) && buf)
				http_remove_header2(msg, buf, &txn->hdr_idx, &ctx);
			else
				txn->flags |= TX_CON_CLO_SET;
		}
	}

	txn->flags |= TX_HDR_CONN_PRS;
	return;
}

/* Apply desired changes on the Connection: header. Values may be removed and/or
 * added depending on the <wanted> flags, which are exclusively composed of
 * TX_CON_CLO_SET and TX_CON_KAL_SET, depending on what flags are desired. The
 * TX_CON_*_SET flags are adjusted in txn->flags depending on what is left.
 */
void http_change_connection_header(struct http_txn *txn, struct http_msg *msg, struct buffer *buf, int wanted)
{
	struct hdr_ctx ctx;
	const char *hdr_val = "Connection";
	int hdr_len = 10;

	ctx.idx = 0;


	if (unlikely(txn->flags & TX_USE_PX_CONN)) {
		hdr_val = "Proxy-Connection";
		hdr_len = 16;
	}

	txn->flags &= ~(TX_CON_CLO_SET | TX_CON_KAL_SET);
	while (http_find_header2(hdr_val, hdr_len, msg->sol, &txn->hdr_idx, &ctx)) {
		if (ctx.vlen >= 10 && word_match(ctx.line + ctx.val, ctx.vlen, "keep-alive", 10)) {
			if (wanted & TX_CON_KAL_SET)
				txn->flags |= TX_CON_KAL_SET;
			else
				http_remove_header2(msg, buf, &txn->hdr_idx, &ctx);
		}
		else if (ctx.vlen >= 5 && word_match(ctx.line + ctx.val, ctx.vlen, "close", 5)) {
			if (wanted & TX_CON_CLO_SET)
				txn->flags |= TX_CON_CLO_SET;
			else
				http_remove_header2(msg, buf, &txn->hdr_idx, &ctx);
		}
	}

	if (wanted == (txn->flags & (TX_CON_CLO_SET|TX_CON_KAL_SET)))
		return;

	if ((wanted & TX_CON_CLO_SET) && !(txn->flags & TX_CON_CLO_SET)) {
		txn->flags |= TX_CON_CLO_SET;
		hdr_val = "Connection: close";
		hdr_len  = 17;
		if (unlikely(txn->flags & TX_USE_PX_CONN)) {
			hdr_val = "Proxy-Connection: close";
			hdr_len = 23;
		}
		http_header_add_tail2(buf, msg, &txn->hdr_idx, hdr_val, hdr_len);
	}

	if ((wanted & TX_CON_KAL_SET) && !(txn->flags & TX_CON_KAL_SET)) {
		txn->flags |= TX_CON_KAL_SET;
		hdr_val = "Connection: keep-alive";
		hdr_len = 22;
		if (unlikely(txn->flags & TX_USE_PX_CONN)) {
			hdr_val = "Proxy-Connection: keep-alive";
			hdr_len = 28;
		}
		http_header_add_tail2(buf, msg, &txn->hdr_idx, hdr_val, hdr_len);
	}
	return;
}

/* Parse the chunk size at buf->lr. Once done, it adjusts ->lr to point to the
 * first byte of body, and increments msg->sov by the number of bytes parsed,
 * so that we know we can forward between ->som and ->sov. Note that due to
 * possible wrapping at the end of the buffer, it is possible that msg->sov is
 * lower than msg->som.
 * Return >0 on success, 0 when some data is missing, <0 on error.
 * Note: this function is designed to parse wrapped CRLF at the end of the buffer.
 */
int http_parse_chunk_size(struct buffer *buf, struct http_msg *msg)
{
	char *ptr = buf->lr;
	char *end = buf->data + buf->size;
	unsigned int chunk = 0;

	/* The chunk size is in the following form, though we are only
	 * interested in the size and CRLF :
	 *    1*HEXDIGIT *WSP *[ ';' extensions ] CRLF
	 */
	while (1) {
		int c;
		if (ptr == buf->r)
			return 0;
		c = hex2i(*ptr);
		if (c < 0) /* not a hex digit anymore */
			break;
		if (++ptr >= end)
			ptr = buf->data;
		if (chunk & 0xF000000) /* overflow will occur */
			goto error;
		chunk = (chunk << 4) + c;
	}

	/* empty size not allowed */
	if (ptr == buf->lr)
		goto error;

	while (http_is_spht[(unsigned char)*ptr]) {
		if (++ptr >= end)
			ptr = buf->data;
		if (ptr == buf->r)
			return 0;
	}

	/* Up to there, we know that at least one byte is present at *ptr. Check
	 * for the end of chunk size.
	 */
	while (1) {
		if (likely(HTTP_IS_CRLF(*ptr))) {
			/* we now have a CR or an LF at ptr */
			if (likely(*ptr == '\r')) {
				if (++ptr >= end)
					ptr = buf->data;
				if (ptr == buf->r)
					return 0;
			}

			if (*ptr != '\n')
				goto error;
			if (++ptr >= end)
				ptr = buf->data;
			/* done */
			break;
		}
		else if (*ptr == ';') {
			/* chunk extension, ends at next CRLF */
			if (++ptr >= end)
				ptr = buf->data;
			if (ptr == buf->r)
				return 0;

			while (!HTTP_IS_CRLF(*ptr)) {
				if (++ptr >= end)
					ptr = buf->data;
				if (ptr == buf->r)
					return 0;
			}
			/* we have a CRLF now, loop above */
			continue;
		}
		else
			goto error;
	}

	/* OK we found our CRLF and now <ptr> points to the next byte,
	 * which may or may not be present. We save that into ->lr and
	 * ->sov.
	 */
	msg->sov += ptr - buf->lr;
	buf->lr = ptr;
	msg->hdr_content_len = chunk;
	msg->msg_state = chunk ? HTTP_MSG_DATA : HTTP_MSG_TRAILERS;
	return 1;
 error:
	msg->err_pos = ptr - buf->data;
	return -1;
}

/* This function skips trailers in the buffer <buf> associated with HTTP
 * message <msg>. The first visited position is buf->lr. If the end of
 * the trailers is found, it is automatically scheduled to be forwarded,
 * msg->msg_state switches to HTTP_MSG_DONE, and the function returns >0.
 * If not enough data are available, the function does not change anything
 * except maybe buf->lr and msg->sov if it could parse some lines, and returns
 * zero. If a parse error is encountered, the function returns < 0 and does not
 * change anything except maybe buf->lr and msg->sov. Note that the message
 * must already be in HTTP_MSG_TRAILERS state before calling this function,
 * which implies that all non-trailers data have already been scheduled for
 * forwarding, and that the difference between msg->som and msg->sov exactly
 * matches the length of trailers already parsed and not forwarded. It is also
 * important to note that this function is designed to be able to parse wrapped
 * headers at end of buffer.
 */
int http_forward_trailers(struct buffer *buf, struct http_msg *msg)
{
	/* we have buf->lr which points to next line. Look for CRLF. */
	while (1) {
		char *p1 = NULL, *p2 = NULL;
		char *ptr = buf->lr;
		int bytes;

		/* scan current line and stop at LF or CRLF */
		while (1) {
			if (ptr == buf->r)
				return 0;

			if (*ptr == '\n') {
				if (!p1)
					p1 = ptr;
				p2 = ptr;
				break;
			}

			if (*ptr == '\r') {
				if (p1) {
					msg->err_pos = ptr - buf->data;
					return -1;
				}
				p1 = ptr;
			}

			ptr++;
			if (ptr >= buf->data + buf->size)
				ptr = buf->data;
		}

		/* after LF; point to beginning of next line */
		p2++;
		if (p2 >= buf->data + buf->size)
			p2 = buf->data;

		bytes = p2 - buf->lr;
		if (bytes < 0)
			bytes += buf->size;

		/* schedule this line for forwarding */
		msg->sov += bytes;
		if (msg->sov >= buf->size)
			msg->sov -= buf->size;

		if (p1 == buf->lr) {
			/* LF/CRLF at beginning of line => end of trailers at p2.
			 * Everything was scheduled for forwarding, there's nothing
			 * left from this message.
			 */
			buf->lr = p2;
			msg->msg_state = HTTP_MSG_DONE;
			return 1;
		}
		/* OK, next line then */
		buf->lr = p2;
	}
}

/* This function may be called only in HTTP_MSG_DATA_CRLF. It reads the CRLF or
 * a possible LF alone at the end of a chunk. It automatically adjusts msg->sov,
 * ->som, buf->lr in order to include this part into the next forwarding phase.
 * It also sets msg_state to HTTP_MSG_CHUNK_SIZE and returns >0 on success. If
 * not enough data are available, the function does not change anything and
 * returns zero. If a parse error is encountered, the function returns < 0 and
 * does not change anything. Note: this function is designed to parse wrapped
 * CRLF at the end of the buffer.
 */
int http_skip_chunk_crlf(struct buffer *buf, struct http_msg *msg)
{
	char *ptr;
	int bytes;

	/* NB: we'll check data availabilty at the end. It's not a
	 * problem because whatever we match first will be checked
	 * against the correct length.
	 */
	bytes = 1;
	ptr = buf->lr;
	if (*ptr == '\r') {
		bytes++;
		ptr++;
		if (ptr >= buf->data + buf->size)
			ptr = buf->data;
	}

	if (bytes > buf->l - buf->send_max)
		return 0;

	if (*ptr != '\n') {
		msg->err_pos = ptr - buf->data;
		return -1;
	}

	ptr++;
	if (ptr >= buf->data + buf->size)
		ptr = buf->data;
	buf->lr = ptr;
	/* prepare the CRLF to be forwarded. msg->som may be before data but we don't care */
	msg->sov = ptr - buf->data;
	msg->som = msg->sov - bytes;
	msg->msg_state = HTTP_MSG_CHUNK_SIZE;
	return 1;
}

void http_buffer_heavy_realign(struct buffer *buf, struct http_msg *msg)
{
	char *end = buf->data + buf->size;
	int off = buf->data + buf->size - buf->w;

	/* two possible cases :
	 *   - the buffer is in one contiguous block, we move it in-place
	 *   - the buffer is in two blocks, we move it via the swap_buffer
	 */
	if (buf->l) {
		int block1 = buf->l;
		int block2 = 0;
		if (buf->r <= buf->w) {
			/* non-contiguous block */
			block1 = buf->data + buf->size - buf->w;
			block2 = buf->r - buf->data;
		}
		if (block2)
			memcpy(swap_buffer, buf->data, block2);
		memmove(buf->data, buf->w, block1);
		if (block2)
			memcpy(buf->data + block1, swap_buffer, block2);
	}

	/* adjust all known pointers */
	buf->w    = buf->data;
	buf->lr  += off; if (buf->lr  >= end) buf->lr  -= buf->size;
	buf->r   += off; if (buf->r   >= end) buf->r   -= buf->size;
	msg->sol += off; if (msg->sol >= end) msg->sol -= buf->size;
	msg->eol += off; if (msg->eol >= end) msg->eol -= buf->size;

	/* adjust relative pointers */
	msg->som  = 0;
	msg->eoh += off; if (msg->eoh >= buf->size) msg->eoh -= buf->size;
	msg->col += off; if (msg->col >= buf->size) msg->col -= buf->size;
	msg->sov += off; if (msg->sov >= buf->size) msg->sov -= buf->size;

	if (msg->err_pos >= 0) {
		msg->err_pos += off;
		if (msg->err_pos >= buf->size)
			msg->err_pos -= buf->size;
	}

	buf->flags &= ~BF_FULL;
	if (buf->l >= buffer_max_len(buf))
		buf->flags |= BF_FULL;
}

/* This stream analyser waits for a complete HTTP request. It returns 1 if the
 * processing can continue on next analysers, or zero if it either needs more
 * data or wants to immediately abort the request (eg: timeout, error, ...). It
 * is tied to AN_REQ_WAIT_HTTP and may may remove itself from s->req->analysers
 * when it has nothing left to do, and may remove any analyser when it wants to
 * abort.
 */
int http_wait_for_request(struct session *s, struct buffer *req, int an_bit)
{
	/*
	 * We will parse the partial (or complete) lines.
	 * We will check the request syntax, and also join multi-line
	 * headers. An index of all the lines will be elaborated while
	 * parsing.
	 *
	 * For the parsing, we use a 28 states FSM.
	 *
	 * Here is the information we currently have :
	 *   req->data + msg->som  = beginning of request
	 *   req->data + msg->eoh  = end of processed headers / start of current one
	 *   msg->eol              = end of current header or line (LF or CRLF)
	 *   req->lr = first non-visited byte
	 *   req->r  = end of data
	 *
	 * At end of parsing, we may perform a capture of the error (if any), and
	 * we will set a few fields (msg->sol, txn->meth, sn->flags/SN_REDIRECTABLE).
	 * We also check for monitor-uri, logging, HTTP/0.9 to 1.0 conversion, and
	 * finally headers capture.
	 */

	int cur_idx;
	int use_close_only;
	struct http_txn *txn = &s->txn;
	struct http_msg *msg = &txn->req;
	struct hdr_ctx ctx;

	DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
		now_ms, __FUNCTION__,
		s,
		req,
		req->rex, req->wex,
		req->flags,
		req->l,
		req->analysers);

	/* we're speaking HTTP here, so let's speak HTTP to the client */
	s->srv_error = http_return_srv_error;

	/* There's a protected area at the end of the buffer for rewriting
	 * purposes. We don't want to start to parse the request if the
	 * protected area is affected, because we may have to move processed
	 * data later, which is much more complicated.
	 */
	if (req->l && msg->msg_state < HTTP_MSG_ERROR) {
		if ((txn->flags & TX_NOT_FIRST) &&
		    unlikely((req->flags & BF_FULL) ||
			     req->r < req->lr ||
			     req->r > req->data + req->size - global.tune.maxrewrite)) {
			if (req->send_max) {
				if (req->flags & (BF_SHUTW|BF_SHUTW_NOW|BF_WRITE_ERROR|BF_WRITE_TIMEOUT))
					goto failed_keep_alive;
				/* some data has still not left the buffer, wake us once that's done */
				buffer_dont_connect(req);
				req->flags |= BF_READ_DONTWAIT; /* try to get back here ASAP */
				return 0;
			}
			if (req->r < req->lr || req->r > req->data + req->size - global.tune.maxrewrite)
				http_buffer_heavy_realign(req, msg);
		}

		/* Note that we have the same problem with the response ; we
		 * may want to send a redirect, error or anything which requires
		 * some spare space. So we'll ensure that we have at least
		 * maxrewrite bytes available in the response buffer before
		 * processing that one. This will only affect pipelined
		 * keep-alive requests.
		 */
		if ((txn->flags & TX_NOT_FIRST) &&
		    unlikely((s->rep->flags & BF_FULL) ||
			     s->rep->r < s->rep->lr ||
			     s->rep->r > s->rep->data + s->rep->size - global.tune.maxrewrite)) {
			if (s->rep->send_max) {
				if (s->rep->flags & (BF_SHUTW|BF_SHUTW_NOW|BF_WRITE_ERROR|BF_WRITE_TIMEOUT))
					goto failed_keep_alive;
				/* don't let a connection request be initiated */
				buffer_dont_connect(req);
				s->rep->flags &= ~BF_EXPECT_MORE; /* speed up sending a previous response */
				s->rep->analysers |= an_bit; /* wake us up once it changes */
				return 0;
			}
		}

		if (likely(req->lr < req->r))
			http_msg_analyzer(req, msg, &txn->hdr_idx);
	}

	/* 1: we might have to print this header in debug mode */
	if (unlikely((global.mode & MODE_DEBUG) &&
		     (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)) &&
		     msg->sol &&
		     (msg->msg_state >= HTTP_MSG_BODY || msg->msg_state == HTTP_MSG_ERROR))) {
		char *eol, *sol;

		sol = req->data + msg->som;
		eol = sol + msg->sl.rq.l;
		debug_hdr("clireq", s, sol, eol);

		sol += hdr_idx_first_pos(&txn->hdr_idx);
		cur_idx = hdr_idx_first_idx(&txn->hdr_idx);

		while (cur_idx) {
			eol = sol + txn->hdr_idx.v[cur_idx].len;
			debug_hdr("clihdr", s, sol, eol);
			sol = eol + txn->hdr_idx.v[cur_idx].cr + 1;
			cur_idx = txn->hdr_idx.v[cur_idx].next;
		}
	}


	/*
	 * Now we quickly check if we have found a full valid request.
	 * If not so, we check the FD and buffer states before leaving.
	 * A full request is indicated by the fact that we have seen
	 * the double LF/CRLF, so the state is >= HTTP_MSG_BODY. Invalid
	 * requests are checked first. When waiting for a second request
	 * on a keep-alive session, if we encounter and error, close, t/o,
	 * we note the error in the session flags but don't set any state.
	 * Since the error will be noted there, it will not be counted by
	 * process_session() as a frontend error.
	 * Last, we may increase some tracked counters' http request errors on
	 * the cases that are deliberately the client's fault. For instance,
	 * a timeout or connection reset is not counted as an error. However
	 * a bad request is.
	 */

	if (unlikely(msg->msg_state < HTTP_MSG_BODY)) {
		/*
		 * First, let's catch bad requests.
		 */
		if (unlikely(msg->msg_state == HTTP_MSG_ERROR)) {
			session_inc_http_req_ctr(s);
			session_inc_http_err_ctr(s);
			proxy_inc_fe_req_ctr(s->fe);
			goto return_bad_req;
		}

		/* 1: Since we are in header mode, if there's no space
		 *    left for headers, we won't be able to free more
		 *    later, so the session will never terminate. We
		 *    must terminate it now.
		 */
		if (unlikely(req->flags & BF_FULL)) {
			/* FIXME: check if URI is set and return Status
			 * 414 Request URI too long instead.
			 */
			session_inc_http_req_ctr(s);
			session_inc_http_err_ctr(s);
			proxy_inc_fe_req_ctr(s->fe);
			goto return_bad_req;
		}

		/* 2: have we encountered a read error ? */
		else if (req->flags & BF_READ_ERROR) {
			if (!(s->flags & SN_ERR_MASK))
				s->flags |= SN_ERR_CLICL;

			if (txn->flags & TX_WAIT_NEXT_RQ)
				goto failed_keep_alive;

			/* we cannot return any message on error */
			if (msg->err_pos >= 0) {
				http_capture_bad_message(&s->fe->invalid_req, s, req, msg, msg->msg_state, s->fe);
				session_inc_http_err_ctr(s);
			}

			msg->msg_state = HTTP_MSG_ERROR;
			req->analysers = 0;

			session_inc_http_req_ctr(s);
			proxy_inc_fe_req_ctr(s->fe);
			s->fe->counters.failed_req++;
			if (s->listener->counters)
				s->listener->counters->failed_req++;

			if (!(s->flags & SN_FINST_MASK))
				s->flags |= SN_FINST_R;
			return 0;
		}

		/* 3: has the read timeout expired ? */
		else if (req->flags & BF_READ_TIMEOUT || tick_is_expired(req->analyse_exp, now_ms)) {
			if (!(s->flags & SN_ERR_MASK))
				s->flags |= SN_ERR_CLITO;

			if (txn->flags & TX_WAIT_NEXT_RQ)
				goto failed_keep_alive;

			/* read timeout : give up with an error message. */
			if (msg->err_pos >= 0) {
				http_capture_bad_message(&s->fe->invalid_req, s, req, msg, msg->msg_state, s->fe);
				session_inc_http_err_ctr(s);
			}
			txn->status = 408;
			stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_408));
			msg->msg_state = HTTP_MSG_ERROR;
			req->analysers = 0;

			session_inc_http_req_ctr(s);
			proxy_inc_fe_req_ctr(s->fe);
			s->fe->counters.failed_req++;
			if (s->listener->counters)
				s->listener->counters->failed_req++;

			if (!(s->flags & SN_FINST_MASK))
				s->flags |= SN_FINST_R;
			return 0;
		}

		/* 4: have we encountered a close ? */
		else if (req->flags & BF_SHUTR) {
			if (!(s->flags & SN_ERR_MASK))
				s->flags |= SN_ERR_CLICL;

			if (txn->flags & TX_WAIT_NEXT_RQ)
				goto failed_keep_alive;

			if (msg->err_pos >= 0)
				http_capture_bad_message(&s->fe->invalid_req, s, req, msg, msg->msg_state, s->fe);
			txn->status = 400;
			stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_400));
			msg->msg_state = HTTP_MSG_ERROR;
			req->analysers = 0;

			session_inc_http_err_ctr(s);
			session_inc_http_req_ctr(s);
			proxy_inc_fe_req_ctr(s->fe);
			s->fe->counters.failed_req++;
			if (s->listener->counters)
				s->listener->counters->failed_req++;

			if (!(s->flags & SN_FINST_MASK))
				s->flags |= SN_FINST_R;
			return 0;
		}

		buffer_dont_connect(req);
		req->flags |= BF_READ_DONTWAIT; /* try to get back here ASAP */
		s->rep->flags &= ~BF_EXPECT_MORE; /* speed up sending a previous response */

		if ((msg->msg_state != HTTP_MSG_RQBEFORE) && (txn->flags & TX_WAIT_NEXT_RQ)) {
			/* If the client starts to talk, let's fall back to
			 * request timeout processing.
			 */
			txn->flags &= ~TX_WAIT_NEXT_RQ;
			req->analyse_exp = TICK_ETERNITY;
		}

		/* just set the request timeout once at the beginning of the request */
		if (!tick_isset(req->analyse_exp)) {
			if ((msg->msg_state == HTTP_MSG_RQBEFORE) &&
			    (txn->flags & TX_WAIT_NEXT_RQ) &&
			    tick_isset(s->be->timeout.httpka))
				req->analyse_exp = tick_add(now_ms, s->be->timeout.httpka);
			else
				req->analyse_exp = tick_add_ifset(now_ms, s->be->timeout.httpreq);
		}

		/* we're not ready yet */
		return 0;

	failed_keep_alive:
		/* Here we process low-level errors for keep-alive requests. In
		 * short, if the request is not the first one and it experiences
		 * a timeout, read error or shutdown, we just silently close so
		 * that the client can try again.
		 */
		txn->status = 0;
		msg->msg_state = HTTP_MSG_RQBEFORE;
		req->analysers = 0;
		s->logs.logwait = 0;
		s->rep->flags &= ~BF_EXPECT_MORE; /* speed up sending a previous response */
		stream_int_retnclose(req->prod, NULL);
		return 0;
	}

	/* OK now we have a complete HTTP request with indexed headers. Let's
	 * complete the request parsing by setting a few fields we will need
	 * later. At this point, we have the last CRLF at req->data + msg->eoh.
	 * If the request is in HTTP/0.9 form, the rule is still true, and eoh
	 * points to the CRLF of the request line. req->lr points to the first
	 * byte after the last LF. msg->col and msg->sov point to the first
	 * byte of data. msg->eol cannot be trusted because it may have been
	 * left uninitialized (for instance in the absence of headers).
	 */

	session_inc_http_req_ctr(s);
	proxy_inc_fe_req_ctr(s->fe); /* one more valid request for this FE */

	if (txn->flags & TX_WAIT_NEXT_RQ) {
		/* kill the pending keep-alive timeout */
		txn->flags &= ~TX_WAIT_NEXT_RQ;
		req->analyse_exp = TICK_ETERNITY;
	}


	/* Maybe we found in invalid header name while we were configured not
	 * to block on that, so we have to capture it now.
	 */
	if (unlikely(msg->err_pos >= 0))
		http_capture_bad_message(&s->fe->invalid_req, s, req, msg, msg->msg_state, s->fe);

	/*
	 * 1: identify the method
	 */
	txn->meth = find_http_meth(msg->sol, msg->sl.rq.m_l);

	/* we can make use of server redirect on GET and HEAD */
	if (txn->meth == HTTP_METH_GET || txn->meth == HTTP_METH_HEAD)
		s->flags |= SN_REDIRECTABLE;

	/*
	 * 2: check if the URI matches the monitor_uri.
	 * We have to do this for every request which gets in, because
	 * the monitor-uri is defined by the frontend.
	 */
	if (unlikely((s->fe->monitor_uri_len != 0) &&
		     (s->fe->monitor_uri_len == msg->sl.rq.u_l) &&
		     !memcmp(msg->sol + msg->sl.rq.u,
			     s->fe->monitor_uri,
			     s->fe->monitor_uri_len))) {
		/*
		 * We have found the monitor URI
		 */
		struct acl_cond *cond;

		s->flags |= SN_MONITOR;

		/* Check if we want to fail this monitor request or not */
		list_for_each_entry(cond, &s->fe->mon_fail_cond, list) {
			int ret = acl_exec_cond(cond, s->fe, s, txn, ACL_DIR_REQ);

			ret = acl_pass(ret);
			if (cond->pol == ACL_COND_UNLESS)
				ret = !ret;

			if (ret) {
				/* we fail this request, let's return 503 service unavail */
				txn->status = 503;
				stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_503));
				goto return_prx_cond;
			}
		}

		/* nothing to fail, let's reply normaly */
		txn->status = 200;
		stream_int_retnclose(req->prod, &http_200_chunk);
		goto return_prx_cond;
	}

	/*
	 * 3: Maybe we have to copy the original REQURI for the logs ?
	 * Note: we cannot log anymore if the request has been
	 * classified as invalid.
	 */
	if (unlikely(s->logs.logwait & LW_REQ)) {
		/* we have a complete HTTP request that we must log */
		if ((txn->uri = pool_alloc2(pool2_requri)) != NULL) {
			int urilen = msg->sl.rq.l;

			if (urilen >= REQURI_LEN)
				urilen = REQURI_LEN - 1;
			memcpy(txn->uri, &req->data[msg->som], urilen);
			txn->uri[urilen] = 0;

			if (!(s->logs.logwait &= ~LW_REQ))
				s->do_log(s);
		} else {
			Alert("HTTP logging : out of memory.\n");
		}
	}

	/* 4. We may have to convert HTTP/0.9 requests to HTTP/1.0 */
	if (unlikely(msg->sl.rq.v_l == 0) && !http_upgrade_v09_to_v10(req, msg, txn))
		goto return_bad_req;

	/* ... and check if the request is HTTP/1.1 or above */
	if ((msg->sl.rq.v_l == 8) &&
	    ((msg->sol[msg->sl.rq.v + 5] > '1') ||
	     ((msg->sol[msg->sl.rq.v + 5] == '1') &&
	      (msg->sol[msg->sl.rq.v + 7] >= '1'))))
		txn->flags |= TX_REQ_VER_11;

	/* "connection" has not been parsed yet */
	txn->flags &= ~(TX_HDR_CONN_PRS | TX_HDR_CONN_CLO | TX_HDR_CONN_KAL);

	/* if the frontend has "option http-use-proxy-header", we'll check if
	 * we have what looks like a proxied connection instead of a connection,
	 * and in this case set the TX_USE_PX_CONN flag to use Proxy-connection.
	 * Note that this is *not* RFC-compliant, however browsers and proxies
	 * happen to do that despite being non-standard :-(
	 * We consider that a request not beginning with either '/' or '*' is
	 * a proxied connection, which covers both "scheme://location" and
	 * CONNECT ip:port.
	 */
	if ((s->fe->options2 & PR_O2_USE_PXHDR) &&
	    msg->sol[msg->sl.rq.u] != '/' && msg->sol[msg->sl.rq.u] != '*')
		txn->flags |= TX_USE_PX_CONN;

	/* transfer length unknown*/
	txn->flags &= ~TX_REQ_XFER_LEN;

	/* 5: we may need to capture headers */
	if (unlikely((s->logs.logwait & LW_REQHDR) && s->fe->req_cap))
		capture_headers(msg->sol, &txn->hdr_idx,
				txn->req.cap, s->fe->req_cap);

	/* 6: determine the transfer-length.
	 * According to RFC2616 #4.4, amended by the HTTPbis working group,
	 * the presence of a message-body in a REQUEST and its transfer length
	 * must be determined that way (in order of precedence) :
	 *   1. The presence of a message-body in a request is signaled by the
	 *      inclusion of a Content-Length or Transfer-Encoding header field
	 *      in the request's header fields.  When a request message contains
	 *      both a message-body of non-zero length and a method that does
	 *      not define any semantics for that request message-body, then an
	 *      origin server SHOULD either ignore the message-body or respond
	 *      with an appropriate error message (e.g., 413).  A proxy or
	 *      gateway, when presented the same request, SHOULD either forward
	 *      the request inbound with the message- body or ignore the
	 *      message-body when determining a response.
	 *
	 *   2. If a Transfer-Encoding header field (Section 9.7) is present
	 *      and the "chunked" transfer-coding (Section 6.2) is used, the
	 *      transfer-length is defined by the use of this transfer-coding.
	 *      If a Transfer-Encoding header field is present and the "chunked"
	 *      transfer-coding is not present, the transfer-length is defined
	 *      by the sender closing the connection.
	 *
	 *   3. If a Content-Length header field is present, its decimal value in
	 *      OCTETs represents both the entity-length and the transfer-length.
	 *      If a message is received with both a Transfer-Encoding header
	 *      field and a Content-Length header field, the latter MUST be ignored.
	 *
	 *   4. By the server closing the connection. (Closing the connection
	 *      cannot be used to indicate the end of a request body, since that
	 *      would leave no possibility for the server to send back a response.)
	 *
	 *   Whenever a transfer-coding is applied to a message-body, the set of
	 *   transfer-codings MUST include "chunked", unless the message indicates
	 *   it is terminated by closing the connection.  When the "chunked"
	 *   transfer-coding is used, it MUST be the last transfer-coding applied
	 *   to the message-body.
	 */

	use_close_only = 0;
	ctx.idx = 0;
	/* set TE_CHNK and XFER_LEN only if "chunked" is seen last */
	while ((txn->flags & TX_REQ_VER_11) &&
	       http_find_header2("Transfer-Encoding", 17, msg->sol, &txn->hdr_idx, &ctx)) {
		if (ctx.vlen == 7 && strncasecmp(ctx.line + ctx.val, "chunked", 7) == 0)
			txn->flags |= (TX_REQ_TE_CHNK | TX_REQ_XFER_LEN);
		else if (txn->flags & TX_REQ_TE_CHNK) {
			/* bad transfer-encoding (chunked followed by something else) */
			use_close_only = 1;
			txn->flags &= ~(TX_REQ_TE_CHNK | TX_REQ_XFER_LEN);
			break;
		}
	}

	ctx.idx = 0;
	while (!(txn->flags & TX_REQ_TE_CHNK) && !use_close_only &&
	       http_find_header2("Content-Length", 14, msg->sol, &txn->hdr_idx, &ctx)) {
		signed long long cl;

		if (!ctx.vlen)
			goto return_bad_req;

		if (strl2llrc(ctx.line + ctx.val, ctx.vlen, &cl))
			goto return_bad_req; /* parse failure */

		if (cl < 0)
			goto return_bad_req;

		if ((txn->flags & TX_REQ_CNT_LEN) && (msg->hdr_content_len != cl))
			goto return_bad_req; /* already specified, was different */

		txn->flags |= TX_REQ_CNT_LEN | TX_REQ_XFER_LEN;
		msg->hdr_content_len = cl;
	}

	/* bodyless requests have a known length */
	if (!use_close_only)
		txn->flags |= TX_REQ_XFER_LEN;

	/* end of job, return OK */
	req->analysers &= ~an_bit;
	req->analyse_exp = TICK_ETERNITY;
	return 1;

 return_bad_req:
	/* We centralize bad requests processing here */
	if (unlikely(msg->msg_state == HTTP_MSG_ERROR) || msg->err_pos >= 0) {
		/* we detected a parsing error. We want to archive this request
		 * in the dedicated proxy area for later troubleshooting.
		 */
		http_capture_bad_message(&s->fe->invalid_req, s, req, msg, msg->msg_state, s->fe);
	}

	txn->req.msg_state = HTTP_MSG_ERROR;
	txn->status = 400;
	stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_400));

	s->fe->counters.failed_req++;
	if (s->listener->counters)
		s->listener->counters->failed_req++;

 return_prx_cond:
	if (!(s->flags & SN_ERR_MASK))
		s->flags |= SN_ERR_PRXCOND;
	if (!(s->flags & SN_FINST_MASK))
		s->flags |= SN_FINST_R;

	req->analysers = 0;
	req->analyse_exp = TICK_ETERNITY;
	return 0;
}

/* We reached the stats page through a POST request.
 * Parse the posted data and enable/disable servers if necessary.
 * Returns 1 if request was parsed or zero if it needs more data.
 */
int http_process_req_stat_post(struct session *s, struct buffer *req)
{
	struct http_txn *txn = &s->txn;
	struct proxy *px;
	struct server *sv;

	char *backend = NULL;
	int action = 0;

	char *first_param, *cur_param, *next_param, *end_params;

	first_param = req->data + txn->req.eoh + 2;
	end_params  = first_param + txn->req.hdr_content_len;

	cur_param = next_param = end_params;

	if (end_params >= req->data + req->size - global.tune.maxrewrite) {
		/* Prevent buffer overflow */
		s->data_ctx.stats.st_code = STAT_STATUS_EXCD;
		return 1;
	}
	else if (end_params > req->data + req->l) {
		/* we need more data */
		s->data_ctx.stats.st_code = STAT_STATUS_NONE;
		return 0;
	}

	*end_params = '\0';

	s->data_ctx.stats.st_code = STAT_STATUS_NONE;

	/*
	 * Parse the parameters in reverse order to only store the last value.
	 * From the html form, the backend and the action are at the end.
	 */
	while (cur_param > first_param) {
		char *key, *value;

		cur_param--;
		if ((*cur_param == '&') || (cur_param == first_param)) {
			/* Parse the key */
			key = cur_param;
			if (cur_param != first_param) {
				/* delimit the string for the next loop */
				*key++ = '\0';
			}

			/* Parse the value */
			value = key;
			while (*value != '\0' && *value != '=') {
				value++;
			}
			if (*value == '=') {
				/* Ok, a value is found, we can mark the end of the key */
				*value++ = '\0';
			}

			/* Now we can check the key to see what to do */
			if (!backend && strcmp(key, "b") == 0) {
				backend = value;
			}
			else if (!action && strcmp(key, "action") == 0) {
				if (strcmp(value, "disable") == 0) {
					action = 1;
				}
				else if (strcmp(value, "enable") == 0) {
					action = 2;
				} else {
					/* unknown action, no need to continue */
					break;
				}
			}
			else if (strcmp(key, "s") == 0) {
				if (backend && action && get_backend_server(backend, value, &px, &sv)) {
					switch (action) {
					case 1:
						if (! (sv->state & SRV_MAINTAIN)) {
							/* Not already in maintenance, we can change the server state */
							sv->state |= SRV_MAINTAIN;
							set_server_down(sv);
							s->data_ctx.stats.st_code = STAT_STATUS_DONE;
						}
						break;
					case 2:
						if ((sv->state & SRV_MAINTAIN)) {
							/* Already in maintenance, we can change the server state */
							set_server_up(sv);
							sv->health = sv->rise;	/* up, but will fall down at first failure */
							s->data_ctx.stats.st_code = STAT_STATUS_DONE;
						}
						break;
					}
				}
			}
			next_param = cur_param;
		}
	}
	return 1;
}

/* This stream analyser runs all HTTP request processing which is common to
 * frontends and backends, which means blocking ACLs, filters, connection-close,
 * reqadd, stats and redirects. This is performed for the designated proxy.
 * It returns 1 if the processing can continue on next analysers, or zero if it
 * either needs more data or wants to immediately abort the request (eg: deny,
 * error, ...).
 */
int http_process_req_common(struct session *s, struct buffer *req, int an_bit, struct proxy *px)
{
	struct http_txn *txn = &s->txn;
	struct http_msg *msg = &txn->req;
	struct acl_cond *cond;
	struct req_acl_rule *req_acl, *req_acl_final = NULL;
	struct redirect_rule *rule;
	struct cond_wordlist *wl;
	int del_ka, del_cl, do_stats;

	if (unlikely(msg->msg_state < HTTP_MSG_BODY)) {
		/* we need more data */
		buffer_dont_connect(req);
		return 0;
	}

	req->analysers &= ~an_bit;
	req->analyse_exp = TICK_ETERNITY;

	DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
		now_ms, __FUNCTION__,
		s,
		req,
		req->rex, req->wex,
		req->flags,
		req->l,
		req->analysers);

	/* first check whether we have some ACLs set to block this request */
	list_for_each_entry(cond, &px->block_cond, list) {
		int ret = acl_exec_cond(cond, px, s, txn, ACL_DIR_REQ);

		ret = acl_pass(ret);
		if (cond->pol == ACL_COND_UNLESS)
			ret = !ret;

		if (ret) {
			txn->status = 403;
			/* let's log the request time */
			s->logs.tv_request = now;
			stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_403));
			session_inc_http_err_ctr(s);
			goto return_prx_cond;
		}
	}

	do_stats = stats_check_uri(s, px);

	list_for_each_entry(req_acl, (do_stats?&px->uri_auth->req_acl:&px->req_acl), list) {
		int ret = 1;

		if (req_acl->action >= PR_REQ_ACL_ACT_MAX)
			continue;

		/* check condition, but only if attached */
		if (req_acl->cond) {
			ret = acl_exec_cond(req_acl->cond, px, s, txn, ACL_DIR_REQ);
			ret = acl_pass(ret);

			if (req_acl->cond->pol == ACL_COND_UNLESS)
				ret = !ret;
		}

		if (ret) {
			req_acl_final = req_acl;
			break;
		}
	}

	if (req_acl_final && req_acl_final->action == PR_REQ_ACL_ACT_DENY) {
			txn->status = 403;
			s->logs.tv_request = now;
			stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_403));
			session_inc_http_err_ctr(s);
			goto return_prx_cond;
	}

	/* try headers filters */
	if (px->req_exp != NULL) {
		if (apply_filters_to_request(s, req, px) < 0)
			goto return_bad_req;

		/* has the request been denied ? */
		if (txn->flags & TX_CLDENY) {
			/* no need to go further */
			txn->status = 403;
			/* let's log the request time */
			s->logs.tv_request = now;
			stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_403));
			session_inc_http_err_ctr(s);
			goto return_prx_cond;
		}

		/* When a connection is tarpitted, we use the tarpit timeout,
		 * which may be the same as the connect timeout if unspecified.
		 * If unset, then set it to zero because we really want it to
		 * eventually expire. We build the tarpit as an analyser.
		 */
		if (txn->flags & TX_CLTARPIT) {
			buffer_erase(s->req);
			/* wipe the request out so that we can drop the connection early
			 * if the client closes first.
			 */
			buffer_dont_connect(req);
			req->analysers = 0; /* remove switching rules etc... */
			req->analysers |= AN_REQ_HTTP_TARPIT;
			req->analyse_exp = tick_add_ifset(now_ms,  s->be->timeout.tarpit);
			if (!req->analyse_exp)
				req->analyse_exp = tick_add(now_ms, 0);
			session_inc_http_err_ctr(s);
			return 1;
		}
	}

	/* Until set to anything else, the connection mode is set as TUNNEL. It will
	 * only change if both the request and the config reference something else.
	 * Option httpclose by itself does not set a mode, it remains a tunnel mode
	 * in which headers are mangled. However, if another mode is set, it will
	 * affect it (eg: server-close/keep-alive + httpclose = close). Note that we
	 * avoid to redo the same work if FE and BE have the same settings (common).
	 * The method consists in checking if options changed between the two calls
	 * (implying that either one is non-null, or one of them is non-null and we
	 * are there for the first time.
	 */

	del_cl = del_ka = 0;

	if ((!(txn->flags & TX_HDR_CONN_PRS) &&
	     (s->fe->options & (PR_O_KEEPALIVE|PR_O_SERVER_CLO|PR_O_HTTP_CLOSE|PR_O_FORCE_CLO))) ||
	    ((s->fe->options & (PR_O_KEEPALIVE|PR_O_SERVER_CLO|PR_O_HTTP_CLOSE|PR_O_FORCE_CLO)) !=
	     (s->be->options & (PR_O_KEEPALIVE|PR_O_SERVER_CLO|PR_O_HTTP_CLOSE|PR_O_FORCE_CLO)))) {
		int tmp = TX_CON_WANT_TUN;

		if ((s->fe->options|s->be->options) & PR_O_KEEPALIVE ||
		    ((s->fe->options2|s->be->options2) & PR_O2_FAKE_KA))
			tmp = TX_CON_WANT_KAL;
		if ((s->fe->options|s->be->options) & PR_O_SERVER_CLO)
			tmp = TX_CON_WANT_SCL;
		if ((s->fe->options|s->be->options) & PR_O_FORCE_CLO)
			tmp = TX_CON_WANT_CLO;

		if ((txn->flags & TX_CON_WANT_MSK) < tmp)
			txn->flags = (txn->flags & ~TX_CON_WANT_MSK) | tmp;

		if (!(txn->flags & TX_HDR_CONN_PRS)) {
			/* parse the Connection header and possibly clean it */
			int to_del = 0;
			if ((txn->flags & TX_REQ_VER_11) ||
			    ((txn->flags & TX_CON_WANT_MSK) >= TX_CON_WANT_SCL &&
			     !((s->fe->options2|s->be->options2) & PR_O2_FAKE_KA)))
				to_del |= 2; /* remove "keep-alive" */
			if (!(txn->flags & TX_REQ_VER_11))
				to_del |= 1; /* remove "close" */
			http_parse_connection_header(txn, msg, req, to_del);
		}

		/* check if client or config asks for explicit close in KAL/SCL */
		if (((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL ||
		     (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL) &&
		    ((txn->flags & TX_HDR_CONN_CLO) ||                         /* "connection: close" */
		     (txn->flags & (TX_REQ_VER_11|TX_HDR_CONN_KAL)) == 0 ||    /* no "connection: k-a" in 1.0 */
		     ((s->fe->options|s->be->options) & PR_O_HTTP_CLOSE) ||    /* httpclose+any = forceclose */
		     !(txn->flags & TX_REQ_XFER_LEN) ||                        /* no length known => close */
		     s->fe->state == PR_STSTOPPED))                            /* frontend is stopping */
		    txn->flags = (txn->flags & ~TX_CON_WANT_MSK) | TX_CON_WANT_CLO;
	}

	/* add request headers from the rule sets in the same order */
	list_for_each_entry(wl, &px->req_add, list) {
		if (wl->cond) {
			int ret = acl_exec_cond(wl->cond, px, s, txn, ACL_DIR_REQ);
			ret = acl_pass(ret);
			if (((struct acl_cond *)wl->cond)->pol == ACL_COND_UNLESS)
				ret = !ret;
			if (!ret)
				continue;
		}

		if (unlikely(http_header_add_tail(req, &txn->req, &txn->hdr_idx, wl->s) < 0))
			goto return_bad_req;
	}

	if (req_acl_final && req_acl_final->action == PR_REQ_ACL_ACT_HTTP_AUTH) {
		struct chunk msg;
		char *realm = req_acl->http_auth.realm;

		if (!realm)
			realm = do_stats?STATS_DEFAULT_REALM:px->id;

		sprintf(trash, (txn->flags & TX_USE_PX_CONN) ? HTTP_407_fmt : HTTP_401_fmt, realm);
		chunk_initlen(&msg, trash, sizeof(trash), strlen(trash));
		txn->status = 401;
		stream_int_retnclose(req->prod, &msg);
		/* on 401 we still count one error, because normal browsing
		 * won't significantly increase the counter but brute force
		 * attempts will.
		 */
		session_inc_http_err_ctr(s);
		goto return_prx_cond;
	}

	if (do_stats) {
		struct stats_admin_rule *stats_admin_rule;

		/* We need to provide stats for this request.
		 * FIXME!!! that one is rather dangerous, we want to
		 * make it follow standard rules (eg: clear req->analysers).
		 */

		/* now check whether we have some admin rules for this request */
		list_for_each_entry(stats_admin_rule, &s->be->uri_auth->admin_rules, list) {
			int ret = 1;

			if (stats_admin_rule->cond) {
				ret = acl_exec_cond(stats_admin_rule->cond, s->be, s, &s->txn, ACL_DIR_REQ);
				ret = acl_pass(ret);
				if (stats_admin_rule->cond->pol == ACL_COND_UNLESS)
					ret = !ret;
			}

			if (ret) {
				/* no rule, or the rule matches */
				s->data_ctx.stats.flags |= STAT_ADMIN;
				break;
			}
		}

		/* Was the status page requested with a POST ? */
		if (txn->meth == HTTP_METH_POST) {
			if (s->data_ctx.stats.flags & STAT_ADMIN) {
				if (msg->msg_state < HTTP_MSG_100_SENT) {
					/* If we have HTTP/1.1 and Expect: 100-continue, then we must
					 * send an HTTP/1.1 100 Continue intermediate response.
					 */
					if (txn->flags & TX_REQ_VER_11) {
						struct hdr_ctx ctx;
						ctx.idx = 0;
						/* Expect is allowed in 1.1, look for it */
						if (http_find_header2("Expect", 6, msg->sol, &txn->hdr_idx, &ctx) &&
						    unlikely(ctx.vlen == 12 && strncasecmp(ctx.line+ctx.val, "100-continue", 12) == 0)) {
							buffer_write(s->rep, http_100_chunk.str, http_100_chunk.len);
						}
					}
					msg->msg_state = HTTP_MSG_100_SENT;
					s->logs.tv_request = now;  /* update the request timer to reflect full request */
				}
				if (!http_process_req_stat_post(s, req)) {
					/* we need more data */
					req->analysers |= an_bit;
					buffer_dont_connect(req);
					return 0;
				}
			} else {
				s->data_ctx.stats.st_code = STAT_STATUS_DENY;
			}
		}

		s->logs.tv_request = now;
		s->data_source = DATA_SRC_STATS;
		s->data_state  = DATA_ST_INIT;
		s->task->nice = -32; /* small boost for HTTP statistics */
		stream_int_register_handler(s->rep->prod, http_stats_io_handler);
		s->rep->prod->private = s;
		s->rep->prod->st0 = s->rep->prod->st1 = 0;
		req->analysers = 0;

		return 0;

	}

	/* check whether we have some ACLs set to redirect this request */
	list_for_each_entry(rule, &px->redirect_rules, list) {
		int ret = ACL_PAT_PASS;

		if (rule->cond) {
			ret = acl_exec_cond(rule->cond, px, s, txn, ACL_DIR_REQ);
			ret = acl_pass(ret);
			if (rule->cond->pol == ACL_COND_UNLESS)
				ret = !ret;
		}

		if (ret) {
			struct chunk rdr = { .str = trash, .size = sizeof(trash), .len = 0 };
			const char *msg_fmt;

			/* build redirect message */
			switch(rule->code) {
			case 303:
				msg_fmt = HTTP_303;
				break;
			case 301:
				msg_fmt = HTTP_301;
				break;
			case 302:
			default:
				msg_fmt = HTTP_302;
				break;
			}

			if (unlikely(!chunk_strcpy(&rdr, msg_fmt)))
				goto return_bad_req;

			switch(rule->type) {
			case REDIRECT_TYPE_PREFIX: {
				const char *path;
				int pathlen;

				path = http_get_path(txn);
				/* build message using path */
				if (path) {
					pathlen = txn->req.sl.rq.u_l + (txn->req.sol + txn->req.sl.rq.u) - path;
					if (rule->flags & REDIRECT_FLAG_DROP_QS) {
						int qs = 0;
						while (qs < pathlen) {
							if (path[qs] == '?') {
								pathlen = qs;
								break;
							}
							qs++;
						}
					}
				} else {
					path = "/";
					pathlen = 1;
				}

				if (rdr.len + rule->rdr_len + pathlen > rdr.size - 4)
					goto return_bad_req;

				/* add prefix. Note that if prefix == "/", we don't want to
				 * add anything, otherwise it makes it hard for the user to
				 * configure a self-redirection.
				 */
				if (rule->rdr_len != 1 || *rule->rdr_str != '/') {
					memcpy(rdr.str + rdr.len, rule->rdr_str, rule->rdr_len);
					rdr.len += rule->rdr_len;
				}

				/* add path */
				memcpy(rdr.str + rdr.len, path, pathlen);
				rdr.len += pathlen;

				/* append a slash at the end of the location is needed and missing */
				if (rdr.len && rdr.str[rdr.len - 1] != '/' &&
				    (rule->flags & REDIRECT_FLAG_APPEND_SLASH)) {
					if (rdr.len > rdr.size - 5)
						goto return_bad_req;
					rdr.str[rdr.len] = '/';
					rdr.len++;
				}

				break;
			}
			case REDIRECT_TYPE_LOCATION:
			default:
				if (rdr.len + rule->rdr_len > rdr.size - 4)
					goto return_bad_req;

				/* add location */
				memcpy(rdr.str + rdr.len, rule->rdr_str, rule->rdr_len);
				rdr.len += rule->rdr_len;
				break;
			}

			if (rule->cookie_len) {
				memcpy(rdr.str + rdr.len, "\r\nSet-Cookie: ", 14);
				rdr.len += 14;
				memcpy(rdr.str + rdr.len, rule->cookie_str, rule->cookie_len);
				rdr.len += rule->cookie_len;
				memcpy(rdr.str + rdr.len, "\r\n", 2);
				rdr.len += 2;
			}

			/* add end of headers and the keep-alive/close status.
			 * We may choose to set keep-alive if the Location begins
			 * with a slash, because the client will come back to the
			 * same server.
			 */
			txn->status = rule->code;
			/* let's log the request time */
			s->logs.tv_request = now;

			if (rule->rdr_len >= 1 && *rule->rdr_str == '/' &&
			    (txn->flags & TX_REQ_XFER_LEN) &&
			    !(txn->flags & TX_REQ_TE_CHNK) && !txn->req.hdr_content_len &&
			    ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL ||
			     (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL)) {
				/* keep-alive possible */
				if (!(txn->flags & TX_REQ_VER_11)) {
					if (unlikely(txn->flags & TX_USE_PX_CONN)) {
						memcpy(rdr.str + rdr.len, "\r\nProxy-Connection: keep-alive", 30);
						rdr.len += 30;
					} else {
						memcpy(rdr.str + rdr.len, "\r\nConnection: keep-alive", 24);
						rdr.len += 24;
					}
				}
				memcpy(rdr.str + rdr.len, "\r\n\r\n", 4);
				rdr.len += 4;
				buffer_write(req->prod->ob, rdr.str, rdr.len);
				/* "eat" the request */
				buffer_ignore(req, msg->sov - msg->som);
				msg->som = msg->sov;
				req->analysers = AN_REQ_HTTP_XFER_BODY;
				s->rep->analysers = AN_RES_HTTP_XFER_BODY;
				txn->req.msg_state = HTTP_MSG_CLOSED;
				txn->rsp.msg_state = HTTP_MSG_DONE;
				break;
			} else {
				/* keep-alive not possible */
				if (unlikely(txn->flags & TX_USE_PX_CONN)) {
					memcpy(rdr.str + rdr.len, "\r\nProxy-Connection: close\r\n\r\n", 29);
					rdr.len += 29;
				} else {
					memcpy(rdr.str + rdr.len, "\r\nConnection: close\r\n\r\n", 23);
					rdr.len += 23;
				}
				stream_int_retnclose(req->prod, &rdr);
				goto return_prx_cond;
			}
		}
	}

	/* POST requests may be accompanied with an "Expect: 100-Continue" header.
	 * If this happens, then the data will not come immediately, so we must
	 * send all what we have without waiting. Note that due to the small gain
	 * in waiting for the body of the request, it's easier to simply put the
	 * BF_SEND_DONTWAIT flag any time. It's a one-shot flag so it will remove
	 * itself once used.
	 */
	req->flags |= BF_SEND_DONTWAIT;

	/* that's OK for us now, let's move on to next analysers */
	return 1;

 return_bad_req:
	/* We centralize bad requests processing here */
	if (unlikely(msg->msg_state == HTTP_MSG_ERROR) || msg->err_pos >= 0) {
		/* we detected a parsing error. We want to archive this request
		 * in the dedicated proxy area for later troubleshooting.
		 */
		http_capture_bad_message(&s->fe->invalid_req, s, req, msg, msg->msg_state, s->fe);
	}

	txn->req.msg_state = HTTP_MSG_ERROR;
	txn->status = 400;
	stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_400));

	s->fe->counters.failed_req++;
	if (s->listener->counters)
		s->listener->counters->failed_req++;

 return_prx_cond:
	if (!(s->flags & SN_ERR_MASK))
		s->flags |= SN_ERR_PRXCOND;
	if (!(s->flags & SN_FINST_MASK))
		s->flags |= SN_FINST_R;

	req->analysers = 0;
	req->analyse_exp = TICK_ETERNITY;
	return 0;
}

/* This function performs all the processing enabled for the current request.
 * It returns 1 if the processing can continue on next analysers, or zero if it
 * needs more data, encounters an error, or wants to immediately abort the
 * request. It relies on buffers flags, and updates s->req->analysers.
 */
int http_process_request(struct session *s, struct buffer *req, int an_bit)
{
	struct http_txn *txn = &s->txn;
	struct http_msg *msg = &txn->req;

	if (unlikely(msg->msg_state < HTTP_MSG_BODY)) {
		/* we need more data */
		buffer_dont_connect(req);
		return 0;
	}

	DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
		now_ms, __FUNCTION__,
		s,
		req,
		req->rex, req->wex,
		req->flags,
		req->l,
		req->analysers);

	/*
	 * Right now, we know that we have processed the entire headers
	 * and that unwanted requests have been filtered out. We can do
	 * whatever we want with the remaining request. Also, now we
	 * may have separate values for ->fe, ->be.
	 */

	/*
	 * If HTTP PROXY is set we simply get remote server address
	 * parsing incoming request.
	 */
	if ((s->be->options & PR_O_HTTP_PROXY) && !(s->flags & SN_ADDR_SET)) {
		url2sa(msg->sol + msg->sl.rq.u, msg->sl.rq.u_l, &s->srv_addr);
	}

	/*
	 * 7: Now we can work with the cookies.
	 * Note that doing so might move headers in the request, but
	 * the fields will stay coherent and the URI will not move.
	 * This should only be performed in the backend.
	 */
	if ((s->be->cookie_name || s->be->appsession_name || s->fe->capture_name)
	    && !(txn->flags & (TX_CLDENY|TX_CLTARPIT)))
		manage_client_side_cookies(s, req);

	/*
	 * 8: the appsession cookie was looked up very early in 1.2,
	 * so let's do the same now.
	 */

	/* It needs to look into the URI unless persistence must be ignored */
	if ((txn->sessid == NULL) && s->be->appsession_name && !(s->flags & SN_IGNORE_PRST)) {
		get_srv_from_appsession(s, msg->sol + msg->sl.rq.u, msg->sl.rq.u_l);
	}

	/*
	 * 9: add X-Forwarded-For if either the frontend or the backend
	 * asks for it.
	 */
	if ((s->fe->options | s->be->options) & PR_O_FWDFOR) {
		if (s->cli_addr.ss_family == AF_INET) {
			/* Add an X-Forwarded-For header unless the source IP is
			 * in the 'except' network range.
			 */
			if ((!s->fe->except_mask.s_addr ||
			     (((struct sockaddr_in *)&s->cli_addr)->sin_addr.s_addr & s->fe->except_mask.s_addr)
			     != s->fe->except_net.s_addr) &&
			    (!s->be->except_mask.s_addr ||
			     (((struct sockaddr_in *)&s->cli_addr)->sin_addr.s_addr & s->be->except_mask.s_addr)
			     != s->be->except_net.s_addr)) {
				int len;
				unsigned char *pn;
				pn = (unsigned char *)&((struct sockaddr_in *)&s->cli_addr)->sin_addr;

				/* Note: we rely on the backend to get the header name to be used for
				 * x-forwarded-for, because the header is really meant for the backends.
				 * However, if the backend did not specify any option, we have to rely
				 * on the frontend's header name.
				 */
				if (s->be->fwdfor_hdr_len) {
					len = s->be->fwdfor_hdr_len;
					memcpy(trash, s->be->fwdfor_hdr_name, len);
				} else {
					len = s->fe->fwdfor_hdr_len;
					memcpy(trash, s->fe->fwdfor_hdr_name, len);
				}
				len += sprintf(trash + len, ": %d.%d.%d.%d", pn[0], pn[1], pn[2], pn[3]);

				if (unlikely(http_header_add_tail2(req, &txn->req,
								   &txn->hdr_idx, trash, len) < 0))
					goto return_bad_req;
			}
		}
		else if (s->cli_addr.ss_family == AF_INET6) {
			/* FIXME: for the sake of completeness, we should also support
			 * 'except' here, although it is mostly useless in this case.
			 */
			int len;
			char pn[INET6_ADDRSTRLEN];
			inet_ntop(AF_INET6,
				  (const void *)&((struct sockaddr_in6 *)(&s->cli_addr))->sin6_addr,
				  pn, sizeof(pn));

			/* Note: we rely on the backend to get the header name to be used for
			 * x-forwarded-for, because the header is really meant for the backends.
			 * However, if the backend did not specify any option, we have to rely
			 * on the frontend's header name.
			 */
			if (s->be->fwdfor_hdr_len) {
				len = s->be->fwdfor_hdr_len;
				memcpy(trash, s->be->fwdfor_hdr_name, len);
			} else {
				len = s->fe->fwdfor_hdr_len;
				memcpy(trash, s->fe->fwdfor_hdr_name, len);
			}
			len += sprintf(trash + len, ": %s", pn);

			if (unlikely(http_header_add_tail2(req, &txn->req,
							   &txn->hdr_idx, trash, len) < 0))
				goto return_bad_req;
		}
	}

	/*
	 * 10: add X-Original-To if either the frontend or the backend
	 * asks for it.
	 */
	if ((s->fe->options | s->be->options) & PR_O_ORGTO) {

		/* FIXME: don't know if IPv6 can handle that case too. */
		if (s->cli_addr.ss_family == AF_INET) {
			/* Add an X-Original-To header unless the destination IP is
			 * in the 'except' network range.
			 */
			if (!(s->flags & SN_FRT_ADDR_SET))
				get_frt_addr(s);

			if (s->frt_addr.ss_family == AF_INET &&
			    ((!s->fe->except_mask_to.s_addr ||
			      (((struct sockaddr_in *)&s->frt_addr)->sin_addr.s_addr & s->fe->except_mask_to.s_addr)
			      != s->fe->except_to.s_addr) &&
			     (!s->be->except_mask_to.s_addr ||
			      (((struct sockaddr_in *)&s->frt_addr)->sin_addr.s_addr & s->be->except_mask_to.s_addr)
			      != s->be->except_to.s_addr))) {
				int len;
				unsigned char *pn;
				pn = (unsigned char *)&((struct sockaddr_in *)&s->frt_addr)->sin_addr;

				/* Note: we rely on the backend to get the header name to be used for
				 * x-original-to, because the header is really meant for the backends.
				 * However, if the backend did not specify any option, we have to rely
				 * on the frontend's header name.
				 */
				if (s->be->orgto_hdr_len) {
					len = s->be->orgto_hdr_len;
					memcpy(trash, s->be->orgto_hdr_name, len);
				} else {
					len = s->fe->orgto_hdr_len;
					memcpy(trash, s->fe->orgto_hdr_name, len);
				}
				len += sprintf(trash + len, ": %d.%d.%d.%d", pn[0], pn[1], pn[2], pn[3]);

				if (unlikely(http_header_add_tail2(req, &txn->req,
								   &txn->hdr_idx, trash, len) < 0))
					goto return_bad_req;
			}
		}
	}

	/* 11: add "Connection: close" or "Connection: keep-alive" if needed and not yet set. */
	if (((txn->flags & TX_CON_WANT_MSK) != TX_CON_WANT_TUN) ||
	    ((s->fe->options|s->be->options) & PR_O_HTTP_CLOSE)) {
		unsigned int want_flags = 0;

		if (txn->flags & TX_REQ_VER_11) {
			if (((txn->flags & TX_CON_WANT_MSK) >= TX_CON_WANT_SCL ||
			    ((s->fe->options|s->be->options) & PR_O_HTTP_CLOSE)) &&
			    !((s->fe->options2|s->be->options2) & PR_O2_FAKE_KA))
				want_flags |= TX_CON_CLO_SET;
		} else {
			if (((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL &&
			     !((s->fe->options|s->be->options) & PR_O_HTTP_CLOSE)) ||
			    ((s->fe->options2|s->be->options2) & PR_O2_FAKE_KA))
				want_flags |= TX_CON_KAL_SET;
		}

		if (want_flags != (txn->flags & (TX_CON_CLO_SET|TX_CON_KAL_SET)))
			http_change_connection_header(txn, msg, req, want_flags);
	}


	/* If we have no server assigned yet and we're balancing on url_param
	 * with a POST request, we may be interested in checking the body for
	 * that parameter. This will be done in another analyser.
	 */
	if (!(s->flags & (SN_ASSIGNED|SN_DIRECT)) &&
	    s->txn.meth == HTTP_METH_POST && s->be->url_param_name != NULL &&
	    s->be->url_param_post_limit != 0 &&
	    (txn->flags & (TX_REQ_CNT_LEN|TX_REQ_TE_CHNK)) &&
	    memchr(msg->sol + msg->sl.rq.u, '?', msg->sl.rq.u_l) == NULL) {
		buffer_dont_connect(req);
		req->analysers |= AN_REQ_HTTP_BODY;
	}

	if (txn->flags & TX_REQ_XFER_LEN)
		req->analysers |= AN_REQ_HTTP_XFER_BODY;

	/*************************************************************
	 * OK, that's finished for the headers. We have done what we *
	 * could. Let's switch to the DATA state.                    *
	 ************************************************************/
	req->analyse_exp = TICK_ETERNITY;
	req->analysers &= ~an_bit;

	s->logs.tv_request = now;
	/* OK let's go on with the BODY now */
	return 1;

 return_bad_req: /* let's centralize all bad requests */
	if (unlikely(msg->msg_state == HTTP_MSG_ERROR) || msg->err_pos >= 0) {
		/* we detected a parsing error. We want to archive this request
		 * in the dedicated proxy area for later troubleshooting.
		 */
		http_capture_bad_message(&s->fe->invalid_req, s, req, msg, msg->msg_state, s->fe);
	}

	txn->req.msg_state = HTTP_MSG_ERROR;
	txn->status = 400;
	req->analysers = 0;
	stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_400));

	s->fe->counters.failed_req++;
	if (s->listener->counters)
		s->listener->counters->failed_req++;

	if (!(s->flags & SN_ERR_MASK))
		s->flags |= SN_ERR_PRXCOND;
	if (!(s->flags & SN_FINST_MASK))
		s->flags |= SN_FINST_R;
	return 0;
}

/* This function is an analyser which processes the HTTP tarpit. It always
 * returns zero, at the beginning because it prevents any other processing
 * from occurring, and at the end because it terminates the request.
 */
int http_process_tarpit(struct session *s, struct buffer *req, int an_bit)
{
	struct http_txn *txn = &s->txn;

	/* This connection is being tarpitted. The CLIENT side has
	 * already set the connect expiration date to the right
	 * timeout. We just have to check that the client is still
	 * there and that the timeout has not expired.
	 */
	buffer_dont_connect(req);
	if ((req->flags & (BF_SHUTR|BF_READ_ERROR)) == 0 &&
	    !tick_is_expired(req->analyse_exp, now_ms))
		return 0;

	/* We will set the queue timer to the time spent, just for
	 * logging purposes. We fake a 500 server error, so that the
	 * attacker will not suspect his connection has been tarpitted.
	 * It will not cause trouble to the logs because we can exclude
	 * the tarpitted connections by filtering on the 'PT' status flags.
	 */
	s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);

	txn->status = 500;
	if (req->flags != BF_READ_ERROR)
		stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_500));

	req->analysers = 0;
	req->analyse_exp = TICK_ETERNITY;

	s->fe->counters.failed_req++;
	if (s->listener->counters)
		s->listener->counters->failed_req++;

	if (!(s->flags & SN_ERR_MASK))
		s->flags |= SN_ERR_PRXCOND;
	if (!(s->flags & SN_FINST_MASK))
		s->flags |= SN_FINST_T;
	return 0;
}

/* This function is an analyser which processes the HTTP request body. It looks
 * for parameters to be used for the load balancing algorithm (url_param). It
 * must only be called after the standard HTTP request processing has occurred,
 * because it expects the request to be parsed. It returns zero if it needs to
 * read more data, or 1 once it has completed its analysis.
 */
int http_process_request_body(struct session *s, struct buffer *req, int an_bit)
{
	struct http_txn *txn = &s->txn;
	struct http_msg *msg = &s->txn.req;
	long long limit = s->be->url_param_post_limit;

	/* We have to parse the HTTP request body to find any required data.
	 * "balance url_param check_post" should have been the only way to get
	 * into this. We were brought here after HTTP header analysis, so all
	 * related structures are ready.
	 */

	if (unlikely(msg->msg_state < HTTP_MSG_BODY))
		goto missing_data;

	if (msg->msg_state < HTTP_MSG_100_SENT) {
		/* If we have HTTP/1.1 and Expect: 100-continue, then we must
		 * send an HTTP/1.1 100 Continue intermediate response.
		 */
		if (txn->flags & TX_REQ_VER_11) {
			struct hdr_ctx ctx;
			ctx.idx = 0;
			/* Expect is allowed in 1.1, look for it */
			if (http_find_header2("Expect", 6, msg->sol, &txn->hdr_idx, &ctx) &&
			    unlikely(ctx.vlen == 12 && strncasecmp(ctx.line+ctx.val, "100-continue", 12) == 0)) {
				buffer_write(s->rep, http_100_chunk.str, http_100_chunk.len);
			}
		}
		msg->msg_state = HTTP_MSG_100_SENT;
	}

	if (msg->msg_state < HTTP_MSG_CHUNK_SIZE) {
		/* we have msg->col and msg->sov which both point to the first
		 * byte of message body. msg->som still points to the beginning
		 * of the message. We must save the body in req->lr because it
		 * survives buffer re-alignments.
		 */
		req->lr = req->data + msg->sov;
		if (txn->flags & TX_REQ_TE_CHNK)
			msg->msg_state = HTTP_MSG_CHUNK_SIZE;
		else
			msg->msg_state = HTTP_MSG_DATA;
	}

	if (msg->msg_state == HTTP_MSG_CHUNK_SIZE) {
		/* read the chunk size and assign it to ->hdr_content_len, then
		 * set ->sov and ->lr to point to the body and switch to DATA or
		 * TRAILERS state.
		 */
		int ret = http_parse_chunk_size(req, msg);

		if (!ret)
			goto missing_data;
		else if (ret < 0) {
			session_inc_http_err_ctr(s);
			goto return_bad_req;
		}
	}

	/* Now we're in HTTP_MSG_DATA or HTTP_MSG_TRAILERS state.
	 * We have the first non-header byte in msg->col, which is either the
	 * beginning of the chunk size or of the data. The first data byte is in
	 * msg->sov, which is equal to msg->col when not using transfer-encoding.
	 * We're waiting for at least <url_param_post_limit> bytes after msg->sov.
	 */

	if (msg->hdr_content_len < limit)
		limit = msg->hdr_content_len;

	if (req->l - (msg->sov - msg->som) >= limit)    /* we have enough bytes now */
		goto http_end;

 missing_data:
	/* we get here if we need to wait for more data */
	if (req->flags & BF_FULL) {
		session_inc_http_err_ctr(s);
		goto return_bad_req;
	}

	if ((req->flags & BF_READ_TIMEOUT) || tick_is_expired(req->analyse_exp, now_ms)) {
		txn->status = 408;
		stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_408));

		if (!(s->flags & SN_ERR_MASK))
			s->flags |= SN_ERR_CLITO;
		if (!(s->flags & SN_FINST_MASK))
			s->flags |= SN_FINST_D;
		goto return_err_msg;
	}

	/* we get here if we need to wait for more data */
	if (!(req->flags & (BF_FULL | BF_READ_ERROR | BF_SHUTR))) {
		/* Not enough data. We'll re-use the http-request
		 * timeout here. Ideally, we should set the timeout
		 * relative to the accept() date. We just set the
		 * request timeout once at the beginning of the
		 * request.
		 */
		buffer_dont_connect(req);
		if (!tick_isset(req->analyse_exp))
			req->analyse_exp = tick_add_ifset(now_ms, s->be->timeout.httpreq);
		return 0;
	}

 http_end:
	/* The situation will not evolve, so let's give up on the analysis. */
	s->logs.tv_request = now;  /* update the request timer to reflect full request */
	req->analysers &= ~an_bit;
	req->analyse_exp = TICK_ETERNITY;
	return 1;

 return_bad_req: /* let's centralize all bad requests */
	txn->req.msg_state = HTTP_MSG_ERROR;
	txn->status = 400;
	stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_400));

	if (!(s->flags & SN_ERR_MASK))
		s->flags |= SN_ERR_PRXCOND;
	if (!(s->flags & SN_FINST_MASK))
		s->flags |= SN_FINST_R;

 return_err_msg:
	req->analysers = 0;
	s->fe->counters.failed_req++;
	if (s->listener->counters)
		s->listener->counters->failed_req++;
	return 0;
}

/* Terminate current transaction and prepare a new one. This is very tricky
 * right now but it works.
 */
void http_end_txn_clean_session(struct session *s)
{
	/* FIXME: We need a more portable way of releasing a backend's and a
	 * server's connections. We need a safer way to reinitialize buffer
	 * flags. We also need a more accurate method for computing per-request
	 * data.
	 */
	http_silent_debug(__LINE__, s);

	s->req->cons->flags |= SI_FL_NOLINGER;
	s->req->cons->shutr(s->req->cons);
	s->req->cons->shutw(s->req->cons);

	http_silent_debug(__LINE__, s);

	if (s->flags & SN_BE_ASSIGNED)
		s->be->beconn--;

	s->logs.t_close = tv_ms_elapsed(&s->logs.tv_accept, &now);
	session_process_counters(s);
	session_stop_backend_counters(s);

	if (s->txn.status) {
		int n;

		n = s->txn.status / 100;
		if (n < 1 || n > 5)
			n = 0;

		if (s->fe->mode == PR_MODE_HTTP)
			s->fe->counters.fe.http.rsp[n]++;

		if ((s->flags & SN_BE_ASSIGNED) &&
		    (s->be->mode == PR_MODE_HTTP))
			s->be->counters.be.http.rsp[n]++;
	}

	/* don't count other requests' data */
	s->logs.bytes_in  -= s->req->l - s->req->send_max;
	s->logs.bytes_out -= s->rep->l - s->rep->send_max;

	/* let's do a final log if we need it */
	if (s->logs.logwait &&
	    !(s->flags & SN_MONITOR) &&
	    (!(s->fe->options & PR_O_NULLNOLOG) || s->req->total)) {
		s->do_log(s);
	}

	s->logs.accept_date = date; /* user-visible date for logging */
	s->logs.tv_accept = now;  /* corrected date for internal use */
	tv_zero(&s->logs.tv_request);
	s->logs.t_queue = -1;
	s->logs.t_connect = -1;
	s->logs.t_data = -1;
	s->logs.t_close = 0;
	s->logs.prx_queue_size = 0;  /* we get the number of pending conns before us */
	s->logs.srv_queue_size = 0; /* we will get this number soon */

	s->logs.bytes_in = s->req->total = s->req->l - s->req->send_max;
	s->logs.bytes_out = s->rep->total = s->rep->l - s->rep->send_max;

	if (s->pend_pos)
		pendconn_free(s->pend_pos);

	if (s->srv) {
		if (s->flags & SN_CURR_SESS) {
			s->flags &= ~SN_CURR_SESS;
			s->srv->cur_sess--;
		}
		if (may_dequeue_tasks(s->srv, s->be))
			process_srv_queue(s->srv);
	}

	if (unlikely(s->srv_conn))
		sess_change_server(s, NULL);
	s->srv = NULL;

	s->req->cons->state     = s->req->cons->prev_state = SI_ST_INI;
	s->req->cons->fd        = -1; /* just to help with debugging */
	s->req->cons->err_type  = SI_ET_NONE;
	s->req->cons->err_loc   = NULL;
	s->req->cons->exp       = TICK_ETERNITY;
	s->req->cons->flags     = SI_FL_NONE;
	s->req->flags &= ~(BF_SHUTW|BF_SHUTW_NOW|BF_AUTO_CONNECT|BF_WRITE_ERROR|BF_STREAMER|BF_STREAMER_FAST);
	s->rep->flags &= ~(BF_SHUTR|BF_SHUTR_NOW|BF_READ_ATTACHED|BF_READ_ERROR|BF_READ_NOEXP|BF_STREAMER|BF_STREAMER_FAST|BF_WRITE_PARTIAL);
	s->flags &= ~(SN_DIRECT|SN_ASSIGNED|SN_ADDR_SET|SN_BE_ASSIGNED|SN_FORCE_PRST|SN_IGNORE_PRST);
	s->flags &= ~(SN_CURR_SESS|SN_REDIRECTABLE);
	s->txn.meth = 0;
	http_reset_txn(s);
	s->txn.flags |= TX_NOT_FIRST | TX_WAIT_NEXT_RQ;
	if (s->fe->options2 & PR_O2_INDEPSTR)
		s->req->cons->flags |= SI_FL_INDEP_STR;

	/* if the request buffer is not empty, it means we're
	 * about to process another request, so send pending
	 * data with MSG_MORE to merge TCP packets when possible.
	 * Just don't do this if the buffer is close to be full,
	 * because the request will wait for it to flush a little
	 * bit before proceeding.
	 */
	if (s->req->l > s->req->send_max) {
		if (s->rep->send_max &&
		    !(s->rep->flags & BF_FULL) &&
		    s->rep->r <= s->rep->data + s->rep->size - global.tune.maxrewrite)
			s->rep->flags |= BF_EXPECT_MORE;
	}

	/* we're removing the analysers, we MUST re-enable events detection */
	buffer_auto_read(s->req);
	buffer_auto_close(s->req);
	buffer_auto_read(s->rep);
	buffer_auto_close(s->rep);

	/* make ->lr point to the first non-forwarded byte */
	s->req->lr = s->req->w + s->req->send_max;
	if (s->req->lr >= s->req->data + s->req->size)
		s->req->lr -= s->req->size;
	s->rep->lr = s->rep->w + s->rep->send_max;
	if (s->rep->lr >= s->rep->data + s->rep->size)
		s->rep->lr -= s->req->size;

	s->req->analysers = s->listener->analysers;
	s->req->analysers &= ~AN_REQ_DECODE_PROXY;
	s->rep->analysers = 0;

	http_silent_debug(__LINE__, s);
}


/* This function updates the request state machine according to the response
 * state machine and buffer flags. It returns 1 if it changes anything (flag
 * or state), otherwise zero. It ignores any state before HTTP_MSG_DONE, as
 * it is only used to find when a request/response couple is complete. Both
 * this function and its equivalent should loop until both return zero. It
 * can set its own state to DONE, CLOSING, CLOSED, TUNNEL, ERROR.
 */
int http_sync_req_state(struct session *s)
{
	struct buffer *buf = s->req;
	struct http_txn *txn = &s->txn;
	unsigned int old_flags = buf->flags;
	unsigned int old_state = txn->req.msg_state;

	http_silent_debug(__LINE__, s);
	if (unlikely(txn->req.msg_state < HTTP_MSG_BODY))
		return 0;

	if (txn->req.msg_state == HTTP_MSG_DONE) {
		/* No need to read anymore, the request was completely parsed.
		 * We can shut the read side unless we want to abort_on_close,
		 * or we have a POST request. The issue with POST requests is
		 * that some browsers still send a CRLF after the request, and
		 * this CRLF must be read so that it does not remain in the kernel
		 * buffers, otherwise a close could cause an RST on some systems
		 * (eg: Linux).
		 */
		if (!(s->be->options & PR_O_ABRT_CLOSE) && txn->meth != HTTP_METH_POST)
			buffer_dont_read(buf);

		if (txn->rsp.msg_state == HTTP_MSG_ERROR)
			goto wait_other_side;

		if (txn->rsp.msg_state < HTTP_MSG_DONE) {
			/* The server has not finished to respond, so we
			 * don't want to move in order not to upset it.
			 */
			goto wait_other_side;
		}

		if (txn->rsp.msg_state == HTTP_MSG_TUNNEL) {
			/* if any side switches to tunnel mode, the other one does too */
			buffer_auto_read(buf);
			txn->req.msg_state = HTTP_MSG_TUNNEL;
			goto wait_other_side;
		}

		/* When we get here, it means that both the request and the
		 * response have finished receiving. Depending on the connection
		 * mode, we'll have to wait for the last bytes to leave in either
		 * direction, and sometimes for a close to be effective.
		 */

		if ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL) {
			/* Server-close mode : queue a connection close to the server */
			if (!(buf->flags & (BF_SHUTW|BF_SHUTW_NOW)))
				buffer_shutw_now(buf);
		}
		else if ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_CLO) {
			/* Option forceclose is set, or either side wants to close,
			 * let's enforce it now that we're not expecting any new
			 * data to come. The caller knows the session is complete
			 * once both states are CLOSED.
			 */
			if (!(buf->flags & (BF_SHUTW|BF_SHUTW_NOW))) {
				buffer_shutr_now(buf);
				buffer_shutw_now(buf);
			}
		}
		else {
			/* The last possible modes are keep-alive and tunnel. Since tunnel
			 * mode does not set the body analyser, we can't reach this place
			 * in tunnel mode, so we're left with keep-alive only.
			 * This mode is currently not implemented, we switch to tunnel mode.
			 */
			buffer_auto_read(buf);
			txn->req.msg_state = HTTP_MSG_TUNNEL;
		}

		if (buf->flags & (BF_SHUTW|BF_SHUTW_NOW)) {
			/* if we've just closed an output, let's switch */
			buf->cons->flags |= SI_FL_NOLINGER;  /* we want to close ASAP */

			if (!(buf->flags & BF_OUT_EMPTY)) {
				txn->req.msg_state = HTTP_MSG_CLOSING;
				goto http_msg_closing;
			}
			else {
				txn->req.msg_state = HTTP_MSG_CLOSED;
				goto http_msg_closed;
			}
		}
		goto wait_other_side;
	}

	if (txn->req.msg_state == HTTP_MSG_CLOSING) {
	http_msg_closing:
		/* nothing else to forward, just waiting for the output buffer
		 * to be empty and for the shutw_now to take effect.
		 */
		if (buf->flags & BF_OUT_EMPTY) {
			txn->req.msg_state = HTTP_MSG_CLOSED;
			goto http_msg_closed;
		}
		else if (buf->flags & BF_SHUTW) {
			txn->req.msg_state = HTTP_MSG_ERROR;
			goto wait_other_side;
		}
	}

	if (txn->req.msg_state == HTTP_MSG_CLOSED) {
	http_msg_closed:
		goto wait_other_side;
	}

 wait_other_side:
	http_silent_debug(__LINE__, s);
	return txn->req.msg_state != old_state || buf->flags != old_flags;
}


/* This function updates the response state machine according to the request
 * state machine and buffer flags. It returns 1 if it changes anything (flag
 * or state), otherwise zero. It ignores any state before HTTP_MSG_DONE, as
 * it is only used to find when a request/response couple is complete. Both
 * this function and its equivalent should loop until both return zero. It
 * can set its own state to DONE, CLOSING, CLOSED, TUNNEL, ERROR.
 */
int http_sync_res_state(struct session *s)
{
	struct buffer *buf = s->rep;
	struct http_txn *txn = &s->txn;
	unsigned int old_flags = buf->flags;
	unsigned int old_state = txn->rsp.msg_state;

	http_silent_debug(__LINE__, s);
	if (unlikely(txn->rsp.msg_state < HTTP_MSG_BODY))
		return 0;

	if (txn->rsp.msg_state == HTTP_MSG_DONE) {
		/* In theory, we don't need to read anymore, but we must
		 * still monitor the server connection for a possible close
		 * while the request is being uploaded, so we don't disable
		 * reading.
		 */
		/* buffer_dont_read(buf); */

		if (txn->req.msg_state == HTTP_MSG_ERROR)
			goto wait_other_side;

		if (txn->req.msg_state < HTTP_MSG_DONE) {
			/* The client seems to still be sending data, probably
			 * because we got an error response during an upload.
			 * We have the choice of either breaking the connection
			 * or letting it pass through. Let's do the later.
			 */
			goto wait_other_side;
		}

		if (txn->req.msg_state == HTTP_MSG_TUNNEL) {
			/* if any side switches to tunnel mode, the other one does too */
			buffer_auto_read(buf);
			txn->rsp.msg_state = HTTP_MSG_TUNNEL;
			goto wait_other_side;
		}

		/* When we get here, it means that both the request and the
		 * response have finished receiving. Depending on the connection
		 * mode, we'll have to wait for the last bytes to leave in either
		 * direction, and sometimes for a close to be effective.
		 */

		if ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL) {
			/* Server-close mode : shut read and wait for the request
			 * side to close its output buffer. The caller will detect
			 * when we're in DONE and the other is in CLOSED and will
			 * catch that for the final cleanup.
			 */
			if (!(buf->flags & (BF_SHUTR|BF_SHUTR_NOW)))
				buffer_shutr_now(buf);
		}
		else if ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_CLO) {
			/* Option forceclose is set, or either side wants to close,
			 * let's enforce it now that we're not expecting any new
			 * data to come. The caller knows the session is complete
			 * once both states are CLOSED.
			 */
			if (!(buf->flags & (BF_SHUTW|BF_SHUTW_NOW))) {
				buffer_shutr_now(buf);
				buffer_shutw_now(buf);
			}
		}
		else {
			/* The last possible modes are keep-alive and tunnel. Since tunnel
			 * mode does not set the body analyser, we can't reach this place
			 * in tunnel mode, so we're left with keep-alive only.
			 * This mode is currently not implemented, we switch to tunnel mode.
			 */
			buffer_auto_read(buf);
			txn->rsp.msg_state = HTTP_MSG_TUNNEL;
		}

		if (buf->flags & (BF_SHUTW|BF_SHUTW_NOW)) {
			/* if we've just closed an output, let's switch */
			if (!(buf->flags & BF_OUT_EMPTY)) {
				txn->rsp.msg_state = HTTP_MSG_CLOSING;
				goto http_msg_closing;
			}
			else {
				txn->rsp.msg_state = HTTP_MSG_CLOSED;
				goto http_msg_closed;
			}
		}
		goto wait_other_side;
	}

	if (txn->rsp.msg_state == HTTP_MSG_CLOSING) {
	http_msg_closing:
		/* nothing else to forward, just waiting for the output buffer
		 * to be empty and for the shutw_now to take effect.
		 */
		if (buf->flags & BF_OUT_EMPTY) {
			txn->rsp.msg_state = HTTP_MSG_CLOSED;
			goto http_msg_closed;
		}
		else if (buf->flags & BF_SHUTW) {
			txn->rsp.msg_state = HTTP_MSG_ERROR;
			s->be->counters.cli_aborts++;
			if (s->srv)
				s->srv->counters.cli_aborts++;
			goto wait_other_side;
		}
	}

	if (txn->rsp.msg_state == HTTP_MSG_CLOSED) {
	http_msg_closed:
		/* drop any pending data */
		buffer_ignore(buf, buf->l - buf->send_max);
		buffer_auto_close(buf);
		buffer_auto_read(buf);
		goto wait_other_side;
	}

 wait_other_side:
	http_silent_debug(__LINE__, s);
	return txn->rsp.msg_state != old_state || buf->flags != old_flags;
}


/* Resync the request and response state machines. Return 1 if either state
 * changes.
 */
int http_resync_states(struct session *s)
{
	struct http_txn *txn = &s->txn;
	int old_req_state = txn->req.msg_state;
	int old_res_state = txn->rsp.msg_state;

	http_silent_debug(__LINE__, s);
	http_sync_req_state(s);
	while (1) {
		http_silent_debug(__LINE__, s);
		if (!http_sync_res_state(s))
			break;
		http_silent_debug(__LINE__, s);
		if (!http_sync_req_state(s))
			break;
	}
	http_silent_debug(__LINE__, s);
	/* OK, both state machines agree on a compatible state.
	 * There are a few cases we're interested in :
	 *  - HTTP_MSG_TUNNEL on either means we have to disable both analysers
	 *  - HTTP_MSG_CLOSED on both sides means we've reached the end in both
	 *    directions, so let's simply disable both analysers.
	 *  - HTTP_MSG_CLOSED on the response only means we must abort the
	 *    request.
	 *  - HTTP_MSG_CLOSED on the request and HTTP_MSG_DONE on the response
	 *    with server-close mode means we've completed one request and we
	 *    must re-initialize the server connection.
	 */

	if (txn->req.msg_state == HTTP_MSG_TUNNEL ||
	    txn->rsp.msg_state == HTTP_MSG_TUNNEL ||
	    (txn->req.msg_state == HTTP_MSG_CLOSED &&
	     txn->rsp.msg_state == HTTP_MSG_CLOSED)) {
		s->req->analysers = 0;
		buffer_auto_close(s->req);
		buffer_auto_read(s->req);
		s->rep->analysers = 0;
		buffer_auto_close(s->rep);
		buffer_auto_read(s->rep);
	}
	else if (txn->rsp.msg_state == HTTP_MSG_CLOSED ||
		 txn->rsp.msg_state == HTTP_MSG_ERROR ||
		 txn->req.msg_state == HTTP_MSG_ERROR ||
		 (s->rep->flags & BF_SHUTW)) {
		s->rep->analysers = 0;
		buffer_auto_close(s->rep);
		buffer_auto_read(s->rep);
		s->req->analysers = 0;
		buffer_abort(s->req);
		buffer_auto_close(s->req);
		buffer_auto_read(s->req);
		buffer_ignore(s->req, s->req->l - s->req->send_max);
	}
	else if (txn->req.msg_state == HTTP_MSG_CLOSED &&
		 txn->rsp.msg_state == HTTP_MSG_DONE &&
		 ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL)) {
		/* server-close: terminate this server connection and
		 * reinitialize a fresh-new transaction.
		 */
		http_end_txn_clean_session(s);
	}

	http_silent_debug(__LINE__, s);
	return txn->req.msg_state != old_req_state ||
		txn->rsp.msg_state != old_res_state;
}

/* This function is an analyser which forwards request body (including chunk
 * sizes if any). It is called as soon as we must forward, even if we forward
 * zero byte. The only situation where it must not be called is when we're in
 * tunnel mode and we want to forward till the close. It's used both to forward
 * remaining data and to resync after end of body. It expects the msg_state to
 * be between MSG_BODY and MSG_DONE (inclusive). It returns zero if it needs to
 * read more data, or 1 once we can go on with next request or end the session.
 * When in MSG_DATA or MSG_TRAILERS, it will automatically forward hdr_content_len
 * bytes of pending data + the headers if not already done (between som and sov).
 * It eventually adjusts som to match sov after the data in between have been sent.
 */
int http_request_forward_body(struct session *s, struct buffer *req, int an_bit)
{
	struct http_txn *txn = &s->txn;
	struct http_msg *msg = &s->txn.req;

	if (unlikely(msg->msg_state < HTTP_MSG_BODY))
		return 0;

	if ((req->flags & (BF_READ_ERROR|BF_READ_TIMEOUT|BF_WRITE_ERROR|BF_WRITE_TIMEOUT)) ||
	    ((req->flags & BF_SHUTW) && (req->to_forward || req->send_max))) {
		/* Output closed while we were sending data. We must abort and
		 * wake the other side up.
		 */
		msg->msg_state = HTTP_MSG_ERROR;
		http_resync_states(s);
		return 1;
	}

	/* in most states, we should abort in case of early close */
	buffer_auto_close(req);

	/* Note that we don't have to send 100-continue back because we don't
	 * need the data to complete our job, and it's up to the server to
	 * decide whether to return 100, 417 or anything else in return of
	 * an "Expect: 100-continue" header.
	 */

	if (msg->msg_state < HTTP_MSG_CHUNK_SIZE) {
		/* we have msg->col and msg->sov which both point to the first
		 * byte of message body. msg->som still points to the beginning
		 * of the message. We must save the body in req->lr because it
		 * survives buffer re-alignments.
		 */
		req->lr = req->data + msg->sov;
		if (txn->flags & TX_REQ_TE_CHNK)
			msg->msg_state = HTTP_MSG_CHUNK_SIZE;
		else {
			msg->msg_state = HTTP_MSG_DATA;
		}
	}

	while (1) {
		http_silent_debug(__LINE__, s);
		/* we may have some data pending */
		if (msg->hdr_content_len || msg->som != msg->sov) {
			int bytes = msg->sov - msg->som;
			if (bytes < 0) /* sov may have wrapped at the end */
				bytes += req->size;
			buffer_forward(req, bytes + msg->hdr_content_len);
			msg->hdr_content_len = 0; /* don't forward that again */
			msg->som = msg->sov;
		}

		if (msg->msg_state == HTTP_MSG_DATA) {
			/* must still forward */
			if (req->to_forward)
				goto missing_data;

			/* nothing left to forward */
			if (txn->flags & TX_REQ_TE_CHNK)
				msg->msg_state = HTTP_MSG_DATA_CRLF;
			else
				msg->msg_state = HTTP_MSG_DONE;
		}
		else if (msg->msg_state == HTTP_MSG_CHUNK_SIZE) {
			/* read the chunk size and assign it to ->hdr_content_len, then
			 * set ->sov and ->lr to point to the body and switch to DATA or
			 * TRAILERS state.
			 */
			int ret = http_parse_chunk_size(req, msg);

			if (!ret)
				goto missing_data;
			else if (ret < 0) {
				session_inc_http_err_ctr(s);
				if (msg->err_pos >= 0)
					http_capture_bad_message(&s->fe->invalid_req, s, req, msg, HTTP_MSG_CHUNK_SIZE, s->be);
				goto return_bad_req;
			}
			/* otherwise we're in HTTP_MSG_DATA or HTTP_MSG_TRAILERS state */
			/* Don't set a PUSH at the end of that chunk if it's not the last one */
			if (msg->msg_state == HTTP_MSG_DATA)
				req->flags |= BF_EXPECT_MORE;
		}
		else if (msg->msg_state == HTTP_MSG_DATA_CRLF) {
			/* we want the CRLF after the data */
			int ret;

			req->lr = req->w + req->send_max;
			if (req->lr >= req->data + req->size)
				req->lr -= req->size;

			ret = http_skip_chunk_crlf(req, msg);

			if (ret == 0)
				goto missing_data;
			else if (ret < 0) {
				session_inc_http_err_ctr(s);
				if (msg->err_pos >= 0)
					http_capture_bad_message(&s->fe->invalid_req, s, req, msg, HTTP_MSG_DATA_CRLF, s->be);
				goto return_bad_req;
			}
			/* we're in MSG_CHUNK_SIZE now */
		}
		else if (msg->msg_state == HTTP_MSG_TRAILERS) {
			int ret = http_forward_trailers(req, msg);

			if (ret == 0)
				goto missing_data;
			else if (ret < 0) {
				session_inc_http_err_ctr(s);
				if (msg->err_pos >= 0)
					http_capture_bad_message(&s->fe->invalid_req, s, req, msg, HTTP_MSG_TRAILERS, s->be);
				goto return_bad_req;
			}
			/* we're in HTTP_MSG_DONE now */
		}
		else {
			int old_state = msg->msg_state;

			/* other states, DONE...TUNNEL */
			/* for keep-alive we don't want to forward closes on DONE */
			if ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL ||
			    (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL)
				buffer_dont_close(req);
			if (http_resync_states(s)) {
				/* some state changes occurred, maybe the analyser
				 * was disabled too.
				 */
				if (unlikely(msg->msg_state == HTTP_MSG_ERROR)) {
					if (req->flags & BF_SHUTW) {
						/* request errors are most likely due to
						 * the server aborting the transfer.
						 */
						goto aborted_xfer;
					}
					if (msg->err_pos >= 0)
						http_capture_bad_message(&s->fe->invalid_req, s, req, msg, old_state, s->be);
					goto return_bad_req;
				}
				return 1;
			}

			/* If "option abortonclose" is set on the backend, we
			 * want to monitor the client's connection and forward
			 * any shutdown notification to the server, which will
			 * decide whether to close or to go on processing the
			 * request.
			 */
			if (s->be->options & PR_O_ABRT_CLOSE) {
				buffer_auto_read(req);
				buffer_auto_close(req);
			}
			else if (s->txn.meth == HTTP_METH_POST) {
				/* POST requests may require to read extra CRLF
				 * sent by broken browsers and which could cause
				 * an RST to be sent upon close on some systems
				 * (eg: Linux).
				 */
				buffer_auto_read(req);
			}

			return 0;
		}
	}

 missing_data:
	/* stop waiting for data if the input is closed before the end */
	if (req->flags & BF_SHUTR) {
		if (!(s->flags & SN_ERR_MASK))
			s->flags |= SN_ERR_CLICL;
		if (!(s->flags & SN_FINST_MASK)) {
			if (txn->rsp.msg_state < HTTP_MSG_ERROR)
				s->flags |= SN_FINST_H;
			else
				s->flags |= SN_FINST_D;
		}

		s->fe->counters.cli_aborts++;
		if (s->fe != s->be)
			s->be->counters.cli_aborts++;
		if (s->srv)
			s->srv->counters.cli_aborts++;

		goto return_bad_req_stats_ok;
	}

	/* waiting for the last bits to leave the buffer */
	if (req->flags & BF_SHUTW)
		goto aborted_xfer;

	/* When TE: chunked is used, we need to get there again to parse remaining
	 * chunks even if the client has closed, so we don't want to set BF_DONTCLOSE.
	 */
	if (txn->flags & TX_REQ_TE_CHNK)
		buffer_dont_close(req);

	http_silent_debug(__LINE__, s);
	return 0;

 return_bad_req: /* let's centralize all bad requests */
	s->fe->counters.failed_req++;
	if (s->listener->counters)
		s->listener->counters->failed_req++;
 return_bad_req_stats_ok:
	txn->req.msg_state = HTTP_MSG_ERROR;
	if (txn->status) {
		/* Note: we don't send any error if some data were already sent */
		stream_int_retnclose(req->prod, NULL);
	} else {
		txn->status = 400;
		stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_400));
	}
	req->analysers = 0;
	s->rep->analysers = 0; /* we're in data phase, we want to abort both directions */

	if (!(s->flags & SN_ERR_MASK))
		s->flags |= SN_ERR_PRXCOND;
	if (!(s->flags & SN_FINST_MASK)) {
		if (txn->rsp.msg_state < HTTP_MSG_ERROR)
			s->flags |= SN_FINST_H;
		else
			s->flags |= SN_FINST_D;
	}
	return 0;

 aborted_xfer:
	txn->req.msg_state = HTTP_MSG_ERROR;
	if (txn->status) {
		/* Note: we don't send any error if some data were already sent */
		stream_int_retnclose(req->prod, NULL);
	} else {
		txn->status = 502;
		stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_502));
	}
	req->analysers = 0;
	s->rep->analysers = 0; /* we're in data phase, we want to abort both directions */

	s->fe->counters.srv_aborts++;
	if (s->fe != s->be)
		s->be->counters.srv_aborts++;
	if (s->srv)
		s->srv->counters.srv_aborts++;

	if (!(s->flags & SN_ERR_MASK))
		s->flags |= SN_ERR_SRVCL;
	if (!(s->flags & SN_FINST_MASK)) {
		if (txn->rsp.msg_state < HTTP_MSG_ERROR)
			s->flags |= SN_FINST_H;
		else
			s->flags |= SN_FINST_D;
	}
	return 0;
}

/* This stream analyser waits for a complete HTTP response. It returns 1 if the
 * processing can continue on next analysers, or zero if it either needs more
 * data or wants to immediately abort the response (eg: timeout, error, ...). It
 * is tied to AN_RES_WAIT_HTTP and may may remove itself from s->rep->analysers
 * when it has nothing left to do, and may remove any analyser when it wants to
 * abort.
 */
int http_wait_for_response(struct session *s, struct buffer *rep, int an_bit)
{
	struct http_txn *txn = &s->txn;
	struct http_msg *msg = &txn->rsp;
	struct hdr_ctx ctx;
	int use_close_only;
	int cur_idx;
	int n;

	DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
		now_ms, __FUNCTION__,
		s,
		rep,
		rep->rex, rep->wex,
		rep->flags,
		rep->l,
		rep->analysers);

	/*
	 * Now parse the partial (or complete) lines.
	 * We will check the response syntax, and also join multi-line
	 * headers. An index of all the lines will be elaborated while
	 * parsing.
	 *
	 * For the parsing, we use a 28 states FSM.
	 *
	 * Here is the information we currently have :
	 *   rep->data + msg->som  = beginning of response
	 *   rep->data + msg->eoh  = end of processed headers / start of current one
	 *   msg->eol              = end of current header or line (LF or CRLF)
	 *   rep->lr = first non-visited byte
	 *   rep->r  = end of data
	 * Once we reach MSG_BODY, rep->sol = rep->data + msg->som
	 */

	/* There's a protected area at the end of the buffer for rewriting
	 * purposes. We don't want to start to parse the request if the
	 * protected area is affected, because we may have to move processed
	 * data later, which is much more complicated.
	 */
	if (rep->l && msg->msg_state < HTTP_MSG_ERROR) {
		if (unlikely((rep->flags & BF_FULL) ||
			     rep->r < rep->lr ||
			     rep->r > rep->data + rep->size - global.tune.maxrewrite)) {
			if (rep->send_max) {
				/* some data has still not left the buffer, wake us once that's done */
				if (rep->flags & (BF_SHUTW|BF_SHUTW_NOW|BF_WRITE_ERROR|BF_WRITE_TIMEOUT))
					goto abort_response;
				buffer_dont_close(rep);
				rep->flags |= BF_READ_DONTWAIT; /* try to get back here ASAP */
				return 0;
			}
			if (rep->l <= rep->size - global.tune.maxrewrite)
				http_buffer_heavy_realign(rep, msg);
		}

		if (likely(rep->lr < rep->r))
			http_msg_analyzer(rep, msg, &txn->hdr_idx);
	}

	/* 1: we might have to print this header in debug mode */
	if (unlikely((global.mode & MODE_DEBUG) &&
		     (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)) &&
		     msg->sol &&
		     (msg->msg_state >= HTTP_MSG_BODY || msg->msg_state == HTTP_MSG_ERROR))) {
		char *eol, *sol;

		sol = rep->data + msg->som;
		eol = sol + msg->sl.st.l;
		debug_hdr("srvrep", s, sol, eol);

		sol += hdr_idx_first_pos(&txn->hdr_idx);
		cur_idx = hdr_idx_first_idx(&txn->hdr_idx);

		while (cur_idx) {
			eol = sol + txn->hdr_idx.v[cur_idx].len;
			debug_hdr("srvhdr", s, sol, eol);
			sol = eol + txn->hdr_idx.v[cur_idx].cr + 1;
			cur_idx = txn->hdr_idx.v[cur_idx].next;
		}
	}

	/*
	 * Now we quickly check if we have found a full valid response.
	 * If not so, we check the FD and buffer states before leaving.
	 * A full response is indicated by the fact that we have seen
	 * the double LF/CRLF, so the state is >= HTTP_MSG_BODY. Invalid
	 * responses are checked first.
	 *
	 * Depending on whether the client is still there or not, we
	 * may send an error response back or not. Note that normally
	 * we should only check for HTTP status there, and check I/O
	 * errors somewhere else.
	 */

	if (unlikely(msg->msg_state < HTTP_MSG_BODY)) {
		/* Invalid response */
		if (unlikely(msg->msg_state == HTTP_MSG_ERROR)) {
			/* we detected a parsing error. We want to archive this response
			 * in the dedicated proxy area for later troubleshooting.
			 */
		hdr_response_bad:
			if (msg->msg_state == HTTP_MSG_ERROR || msg->err_pos >= 0)
				http_capture_bad_message(&s->be->invalid_rep, s, rep, msg, msg->msg_state, s->fe);

			s->be->counters.failed_resp++;
			if (s->srv) {
				s->srv->counters.failed_resp++;
				health_adjust(s->srv, HANA_STATUS_HTTP_HDRRSP);
			}
		abort_response:
			buffer_auto_close(rep);
			rep->analysers = 0;
			txn->status = 502;
			rep->prod->flags |= SI_FL_NOLINGER;
			buffer_ignore(rep, rep->l - rep->send_max);
			stream_int_retnclose(rep->cons, error_message(s, HTTP_ERR_502));

			if (!(s->flags & SN_ERR_MASK))
				s->flags |= SN_ERR_PRXCOND;
			if (!(s->flags & SN_FINST_MASK))
				s->flags |= SN_FINST_H;

			return 0;
		}

		/* too large response does not fit in buffer. */
		else if (rep->flags & BF_FULL) {
			goto hdr_response_bad;
		}

		/* read error */
		else if (rep->flags & BF_READ_ERROR) {
			if (msg->err_pos >= 0)
				http_capture_bad_message(&s->be->invalid_rep, s, rep, msg, msg->msg_state, s->fe);

			s->be->counters.failed_resp++;
			if (s->srv) {
				s->srv->counters.failed_resp++;
				health_adjust(s->srv, HANA_STATUS_HTTP_READ_ERROR);
			}

			buffer_auto_close(rep);
			rep->analysers = 0;
			txn->status = 502;
			rep->prod->flags |= SI_FL_NOLINGER;
			buffer_ignore(rep, rep->l - rep->send_max);
			stream_int_retnclose(rep->cons, error_message(s, HTTP_ERR_502));

			if (!(s->flags & SN_ERR_MASK))
				s->flags |= SN_ERR_SRVCL;
			if (!(s->flags & SN_FINST_MASK))
				s->flags |= SN_FINST_H;
			return 0;
		}

		/* read timeout : return a 504 to the client. */
		else if (rep->flags & BF_READ_TIMEOUT) {
			if (msg->err_pos >= 0)
				http_capture_bad_message(&s->be->invalid_rep, s, rep, msg, msg->msg_state, s->fe);

			s->be->counters.failed_resp++;
			if (s->srv) {
				s->srv->counters.failed_resp++;
				health_adjust(s->srv, HANA_STATUS_HTTP_READ_TIMEOUT);
			}

			buffer_auto_close(rep);
			rep->analysers = 0;
			txn->status = 504;
			rep->prod->flags |= SI_FL_NOLINGER;
			buffer_ignore(rep, rep->l - rep->send_max);
			stream_int_retnclose(rep->cons, error_message(s, HTTP_ERR_504));

			if (!(s->flags & SN_ERR_MASK))
				s->flags |= SN_ERR_SRVTO;
			if (!(s->flags & SN_FINST_MASK))
				s->flags |= SN_FINST_H;
			return 0;
		}

		/* close from server */
		else if (rep->flags & BF_SHUTR) {
			if (msg->err_pos >= 0)
				http_capture_bad_message(&s->be->invalid_rep, s, rep, msg, msg->msg_state, s->fe);

			s->be->counters.failed_resp++;
			if (s->srv) {
				s->srv->counters.failed_resp++;
				health_adjust(s->srv, HANA_STATUS_HTTP_BROKEN_PIPE);
			}

			buffer_auto_close(rep);
			rep->analysers = 0;
			txn->status = 502;
			rep->prod->flags |= SI_FL_NOLINGER;
			buffer_ignore(rep, rep->l - rep->send_max);
			stream_int_retnclose(rep->cons, error_message(s, HTTP_ERR_502));

			if (!(s->flags & SN_ERR_MASK))
				s->flags |= SN_ERR_SRVCL;
			if (!(s->flags & SN_FINST_MASK))
				s->flags |= SN_FINST_H;
			return 0;
		}

		/* write error to client (we don't send any message then) */
		else if (rep->flags & BF_WRITE_ERROR) {
			if (msg->err_pos >= 0)
				http_capture_bad_message(&s->be->invalid_rep, s, rep, msg, msg->msg_state, s->fe);

			s->be->counters.failed_resp++;
			rep->analysers = 0;
			buffer_auto_close(rep);

			if (!(s->flags & SN_ERR_MASK))
				s->flags |= SN_ERR_CLICL;
			if (!(s->flags & SN_FINST_MASK))
				s->flags |= SN_FINST_H;

			/* process_session() will take care of the error */
			return 0;
		}

		buffer_dont_close(rep);
		return 0;
	}

	/* More interesting part now : we know that we have a complete
	 * response which at least looks like HTTP. We have an indicator
	 * of each header's length, so we can parse them quickly.
	 */

	if (unlikely(msg->err_pos >= 0))
		http_capture_bad_message(&s->be->invalid_rep, s, rep, msg, msg->msg_state, s->fe);

	/*
	 * 1: get the status code
	 */
	n = msg->sol[msg->sl.st.c] - '0';
	if (n < 1 || n > 5)
		n = 0;
	/* when the client triggers a 4xx from the server, it's most often due
	 * to a missing object or permission. These events should be tracked
	 * because if they happen often, it may indicate a brute force or a
	 * vulnerability scan.
	 */
	if (n == 4)
		session_inc_http_err_ctr(s);

	if (s->srv)
		s->srv->counters.p.http.rsp[n]++;

	/* check if the response is HTTP/1.1 or above */
	if ((msg->sl.st.v_l == 8) &&
	    ((msg->sol[5] > '1') ||
	     ((msg->sol[5] == '1') &&
	      (msg->sol[7] >= '1'))))
		txn->flags |= TX_RES_VER_11;

	/* "connection" has not been parsed yet */
	txn->flags &= ~(TX_HDR_CONN_PRS|TX_HDR_CONN_CLO|TX_HDR_CONN_KAL|TX_CON_CLO_SET|TX_CON_KAL_SET);

	/* transfer length unknown*/
	txn->flags &= ~TX_RES_XFER_LEN;

	txn->status = strl2ui(msg->sol + msg->sl.st.c, msg->sl.st.c_l);

	/* Adjust server's health based on status code. Note: status codes 501
	 * and 505 are triggered on demand by client request, so we must not
	 * count them as server failures.
	 */
	if (s->srv) {
		if (txn->status >= 100 && (txn->status < 500 || txn->status == 501 || txn->status == 505))
			health_adjust(s->srv, HANA_STATUS_HTTP_OK);
		else
			health_adjust(s->srv, HANA_STATUS_HTTP_STS);
	}

	/*
	 * 2: check for cacheability.
	 */

	switch (txn->status) {
	case 200:
	case 203:
	case 206:
	case 300:
	case 301:
	case 410:
		/* RFC2616 @13.4:
		 *   "A response received with a status code of
		 *    200, 203, 206, 300, 301 or 410 MAY be stored
		 *    by a cache (...) unless a cache-control
		 *    directive prohibits caching."
		 *
		 * RFC2616 @9.5: POST method :
		 *   "Responses to this method are not cacheable,
		 *    unless the response includes appropriate
		 *    Cache-Control or Expires header fields."
		 */
		if (likely(txn->meth != HTTP_METH_POST) &&
		    (s->be->options & (PR_O_CHK_CACHE|PR_O_COOK_NOC)))
			txn->flags |= TX_CACHEABLE | TX_CACHE_COOK;
		break;
	default:
		break;
	}

	/*
	 * 3: we may need to capture headers
	 */
	s->logs.logwait &= ~LW_RESP;
	if (unlikely((s->logs.logwait & LW_RSPHDR) && s->fe->rsp_cap))
		capture_headers(msg->sol, &txn->hdr_idx,
				txn->rsp.cap, s->fe->rsp_cap);

	/* 4: determine the transfer-length.
	 * According to RFC2616 #4.4, amended by the HTTPbis working group,
	 * the presence of a message-body in a RESPONSE and its transfer length
	 * must be determined that way :
	 *
	 *   All responses to the HEAD request method MUST NOT include a
	 *   message-body, even though the presence of entity-header fields
	 *   might lead one to believe they do.  All 1xx (informational), 204
	 *   (No Content), and 304 (Not Modified) responses MUST NOT include a
	 *   message-body.  All other responses do include a message-body,
	 *   although it MAY be of zero length.
	 *
	 *   1. Any response which "MUST NOT" include a message-body (such as the
	 *      1xx, 204 and 304 responses and any response to a HEAD request) is
	 *      always terminated by the first empty line after the header fields,
	 *      regardless of the entity-header fields present in the message.
	 *
	 *   2. If a Transfer-Encoding header field (Section 9.7) is present and
	 *      the "chunked" transfer-coding (Section 6.2) is used, the
	 *      transfer-length is defined by the use of this transfer-coding.
	 *      If a Transfer-Encoding header field is present and the "chunked"
	 *      transfer-coding is not present, the transfer-length is defined by
	 *      the sender closing the connection.
	 *
	 *   3. If a Content-Length header field is present, its decimal value in
	 *      OCTETs represents both the entity-length and the transfer-length.
	 *      If a message is received with both a Transfer-Encoding header
	 *      field and a Content-Length header field, the latter MUST be ignored.
	 *
	 *   4. If the message uses the media type "multipart/byteranges", and
	 *      the transfer-length is not otherwise specified, then this self-
	 *      delimiting media type defines the transfer-length.  This media
	 *      type MUST NOT be used unless the sender knows that the recipient
	 *      can parse it; the presence in a request of a Range header with
	 *      multiple byte-range specifiers from a 1.1 client implies that the
	 *      client can parse multipart/byteranges responses.
	 *
	 *   5. By the server closing the connection.
	 */

	/* Skip parsing if no content length is possible. The response flags
	 * remain 0 as well as the hdr_content_len, which may or may not mirror
	 * the real header value, and we note that we know the response's length.
	 * FIXME: should we parse anyway and return an error on chunked encoding ?
	 */
	if (txn->meth == HTTP_METH_HEAD ||
	    (txn->status >= 100 && txn->status < 200) ||
	    txn->status == 204 || txn->status == 304) {
		txn->flags |= TX_RES_XFER_LEN;
		goto skip_content_length;
	}

	use_close_only = 0;
	ctx.idx = 0;
	while ((txn->flags & TX_RES_VER_11) &&
	       http_find_header2("Transfer-Encoding", 17, msg->sol, &txn->hdr_idx, &ctx)) {
		if (ctx.vlen == 7 && strncasecmp(ctx.line + ctx.val, "chunked", 7) == 0)
			txn->flags |= (TX_RES_TE_CHNK | TX_RES_XFER_LEN);
		else if (txn->flags & TX_RES_TE_CHNK) {
			/* bad transfer-encoding (chunked followed by something else) */
			use_close_only = 1;
			txn->flags &= ~(TX_RES_TE_CHNK | TX_RES_XFER_LEN);
			break;
		}
	}

	/* FIXME: below we should remove the content-length header(s) in case of chunked encoding */
	ctx.idx = 0;
	while (!(txn->flags & TX_RES_TE_CHNK) && !use_close_only &&
	       http_find_header2("Content-Length", 14, msg->sol, &txn->hdr_idx, &ctx)) {
		signed long long cl;

		if (!ctx.vlen)
			goto hdr_response_bad;

		if (strl2llrc(ctx.line + ctx.val, ctx.vlen, &cl))
			goto hdr_response_bad; /* parse failure */

		if (cl < 0)
			goto hdr_response_bad;

		if ((txn->flags & TX_RES_CNT_LEN) && (msg->hdr_content_len != cl))
			goto hdr_response_bad; /* already specified, was different */

		txn->flags |= TX_RES_CNT_LEN | TX_RES_XFER_LEN;
		msg->hdr_content_len = cl;
	}

	/* FIXME: we should also implement the multipart/byterange method.
	 * For now on, we resort to close mode in this case (unknown length).
	 */
skip_content_length:

	/* end of job, return OK */
	rep->analysers &= ~an_bit;
	rep->analyse_exp = TICK_ETERNITY;
	buffer_auto_close(rep);
	return 1;
}

/* This function performs all the processing enabled for the current response.
 * It normally returns 1 unless it wants to break. It relies on buffers flags,
 * and updates t->rep->analysers. It might make sense to explode it into several
 * other functions. It works like process_request (see indications above).
 */
int http_process_res_common(struct session *t, struct buffer *rep, int an_bit, struct proxy *px)
{
	struct http_txn *txn = &t->txn;
	struct http_msg *msg = &txn->rsp;
	struct proxy *cur_proxy;
	struct cond_wordlist *wl;

	DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
		now_ms, __FUNCTION__,
		t,
		rep,
		rep->rex, rep->wex,
		rep->flags,
		rep->l,
		rep->analysers);

	if (unlikely(msg->msg_state < HTTP_MSG_BODY))	/* we need more data */
		return 0;

	rep->analysers &= ~an_bit;
	rep->analyse_exp = TICK_ETERNITY;

	/* Now we have to check if we need to modify the Connection header.
	 * This is more difficult on the response than it is on the request,
	 * because we can have two different HTTP versions and we don't know
	 * how the client will interprete a response. For instance, let's say
	 * that the client sends a keep-alive request in HTTP/1.0 and gets an
	 * HTTP/1.1 response without any header. Maybe it will bound itself to
	 * HTTP/1.0 because it only knows about it, and will consider the lack
	 * of header as a close, or maybe it knows HTTP/1.1 and can consider
	 * the lack of header as a keep-alive. Thus we will use two flags
	 * indicating how a request MAY be understood by the client. In case
	 * of multiple possibilities, we'll fix the header to be explicit. If
	 * ambiguous cases such as both close and keepalive are seen, then we
	 * will fall back to explicit close. Note that we won't take risks with
	 * HTTP/1.0 clients which may not necessarily understand keep-alive.
	 * See doc/internals/connection-header.txt for the complete matrix.
	 */

	if (unlikely((txn->meth == HTTP_METH_CONNECT && txn->status == 200) ||
		     txn->status == 101)) {
		/* Either we've established an explicit tunnel, or we're
		 * switching the protocol. In both cases, we're very unlikely
		 * to understand the next protocols. We have to switch to tunnel
		 * mode, so that we transfer the request and responses then let
		 * this protocol pass unmodified. When we later implement specific
		 * parsers for such protocols, we'll want to check the Upgrade
		 * header which contains information about that protocol for
		 * responses with status 101 (eg: see RFC2817 about TLS).
		 */
		txn->flags = (txn->flags & ~TX_CON_WANT_MSK) | TX_CON_WANT_TUN;
	}
	else if ((txn->status >= 200) && !(txn->flags & TX_HDR_CONN_PRS) &&
		 ((txn->flags & TX_CON_WANT_MSK) != TX_CON_WANT_TUN ||
		  ((t->fe->options|t->be->options) & PR_O_HTTP_CLOSE))) {
		int to_del = 0;

		/* on unknown transfer length, we must close */
		if (!(txn->flags & TX_RES_XFER_LEN) &&
		    (txn->flags & TX_CON_WANT_MSK) != TX_CON_WANT_TUN)
			txn->flags = (txn->flags & ~TX_CON_WANT_MSK) | TX_CON_WANT_CLO;

		/* now adjust header transformations depending on current state */
		if ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_TUN ||
		    (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_CLO) {
			to_del |= 2; /* remove "keep-alive" on any response */
			if (!(txn->flags & TX_RES_VER_11))
				to_del |= 1; /* remove "close" for HTTP/1.0 responses */
		}
		else { /* SCL / KAL */
			to_del |= 1; /* remove "close" on any response */
			if ((txn->flags & (TX_RES_VER_11|TX_REQ_VER_11)) == (TX_RES_VER_11|TX_REQ_VER_11))
				to_del |= 2; /* remove "keep-alive" on pure 1.1 responses */
		}

		/* Parse and remove some headers from the connection header */
		http_parse_connection_header(txn, msg, rep, to_del);

		/* Some keep-alive responses are converted to Server-close if
		 * the server wants to close.
		 */
		if ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL) {
			if ((txn->flags & TX_HDR_CONN_CLO) ||
			    (txn->flags & (TX_HDR_CONN_KAL|TX_RES_VER_11)) == 0)
				txn->flags = (txn->flags & ~TX_CON_WANT_MSK) | TX_CON_WANT_SCL;
		}
	}

	if (1) {
		/*
		 * 3: we will have to evaluate the filters.
		 * As opposed to version 1.2, now they will be evaluated in the
		 * filters order and not in the header order. This means that
		 * each filter has to be validated among all headers.
		 *
		 * Filters are tried with ->be first, then with ->fe if it is
		 * different from ->be.
		 */

		cur_proxy = t->be;
		while (1) {
			struct proxy *rule_set = cur_proxy;

			/* try headers filters */
			if (rule_set->rsp_exp != NULL) {
				if (apply_filters_to_response(t, rep, rule_set) < 0) {
				return_bad_resp:
					if (t->srv) {
						t->srv->counters.failed_resp++;
						health_adjust(t->srv, HANA_STATUS_HTTP_RSP);
					}
					cur_proxy->counters.failed_resp++;
				return_srv_prx_502:
					rep->analysers = 0;
					txn->status = 502;
					rep->prod->flags |= SI_FL_NOLINGER;
					buffer_ignore(rep, rep->l - rep->send_max);
					stream_int_retnclose(rep->cons, error_message(t, HTTP_ERR_502));
					if (!(t->flags & SN_ERR_MASK))
						t->flags |= SN_ERR_PRXCOND;
					if (!(t->flags & SN_FINST_MASK))
						t->flags |= SN_FINST_H;
					return 0;
				}
			}

			/* has the response been denied ? */
			if (txn->flags & TX_SVDENY) {
				if (t->srv)
					t->srv->counters.failed_secu++;

				cur_proxy->counters.denied_resp++;
				if (t->listener->counters)
					t->listener->counters->denied_resp++;

				goto return_srv_prx_502;
			}

			/* add response headers from the rule sets in the same order */
			list_for_each_entry(wl, &rule_set->rsp_add, list) {
				if (txn->status < 200)
					break;
				if (wl->cond) {
					int ret = acl_exec_cond(wl->cond, px, t, txn, ACL_DIR_RTR);
					ret = acl_pass(ret);
					if (((struct acl_cond *)wl->cond)->pol == ACL_COND_UNLESS)
						ret = !ret;
					if (!ret)
						continue;
				}
				if (unlikely(http_header_add_tail(rep, &txn->rsp, &txn->hdr_idx, wl->s) < 0))
					goto return_bad_resp;
			}

			/* check whether we're already working on the frontend */
			if (cur_proxy == t->fe)
				break;
			cur_proxy = t->fe;
		}

		/*
		 * We may be facing a 100-continue response, in which case this
		 * is not the right response, and we're waiting for the next one.
		 * Let's allow this response to go to the client and wait for the
		 * next one.
		 */
		if (unlikely(txn->status == 100)) {
			hdr_idx_init(&txn->hdr_idx);
			buffer_forward(rep, rep->lr - msg->sol);
			msg->msg_state = HTTP_MSG_RPBEFORE;
			txn->status = 0;
			rep->analysers |= AN_RES_WAIT_HTTP | an_bit;
			return 1;
		}
		else if (unlikely(txn->status < 200))
			goto skip_header_mangling;

		/* we don't have any 1xx status code now */

		/*
		 * 4: check for server cookie.
		 */
		if (t->be->cookie_name || t->be->appsession_name || t->fe->capture_name ||
		    (t->be->options & PR_O_CHK_CACHE))
			manage_server_side_cookies(t, rep);


		/*
		 * 5: check for cache-control or pragma headers if required.
		 */
		if ((t->be->options & (PR_O_COOK_NOC | PR_O_CHK_CACHE)) != 0)
			check_response_for_cacheability(t, rep);

		/*
		 * 6: add server cookie in the response if needed
		 */
		if ((t->srv) && (t->be->options & PR_O_COOK_INS) &&
		    !((txn->flags & TX_SCK_FOUND) && (t->be->options2 & PR_O2_COOK_PSV)) &&
		    (!(t->flags & SN_DIRECT) ||
		     ((t->be->cookie_maxidle || txn->cookie_last_date) &&
		      (!txn->cookie_last_date || (txn->cookie_last_date - date.tv_sec) < 0)) ||
		     (t->be->cookie_maxlife && !txn->cookie_first_date) ||  // set the first_date
		     (!t->be->cookie_maxlife && txn->cookie_first_date)) && // remove the first_date
		    (!(t->be->options & PR_O_COOK_POST) || (txn->meth == HTTP_METH_POST)) &&
		    !(t->flags & SN_IGNORE_PRST)) {
			int len;
			/* the server is known, it's not the one the client requested, or the
			 * cookie's last seen date needs to be refreshed. We have to
			 * insert a set-cookie here, except if we want to insert only on POST
			 * requests and this one isn't. Note that servers which don't have cookies
			 * (eg: some backup servers) will return a full cookie removal request.
			 */
			if (!t->srv->cookie) {
				len = sprintf(trash,
					      "Set-Cookie: %s=; Expires=Thu, 01-Jan-1970 00:00:01 GMT; path=/",
					      t->be->cookie_name);
			}
			else {
				len = sprintf(trash, "Set-Cookie: %s=%s", t->be->cookie_name, t->srv->cookie);

				if (t->be->cookie_maxidle || t->be->cookie_maxlife) {
					/* emit last_date, which is mandatory */
					trash[len++] = COOKIE_DELIM_DATE;
					s30tob64((date.tv_sec+3) >> 2, trash + len); len += 5;
					if (t->be->cookie_maxlife) {
						/* emit first_date, which is either the original one or
						 * the current date.
						 */
						trash[len++] = COOKIE_DELIM_DATE;
						s30tob64(txn->cookie_first_date ?
							 txn->cookie_first_date >> 2 :
							 (date.tv_sec+3) >> 2, trash + len);
						len += 5;
					}
				}
				len += sprintf(trash + len, "; path=/");
			}

			if (t->be->cookie_domain)
				len += sprintf(trash+len, "; domain=%s", t->be->cookie_domain);

			if (unlikely(http_header_add_tail2(rep, &txn->rsp, &txn->hdr_idx,
							   trash, len) < 0))
				goto return_bad_resp;

			txn->flags &= ~TX_SCK_MASK;
			if (t->srv->cookie && (t->flags & SN_DIRECT))
				/* the server did not change, only the date was updated */
				txn->flags |= TX_SCK_UPDATED;
			else
				txn->flags |= TX_SCK_INSERTED;

			/* Here, we will tell an eventual cache on the client side that we don't
			 * want it to cache this reply because HTTP/1.0 caches also cache cookies !
			 * Some caches understand the correct form: 'no-cache="set-cookie"', but
			 * others don't (eg: apache <= 1.3.26). So we use 'private' instead.
			 */
			if ((t->be->options & PR_O_COOK_NOC) && (txn->flags & TX_CACHEABLE)) {

				txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;

				if (unlikely(http_header_add_tail2(rep, &txn->rsp, &txn->hdr_idx,
								   "Cache-control: private", 22) < 0))
					goto return_bad_resp;
			}
		}

		/*
		 * 7: check if result will be cacheable with a cookie.
		 * We'll block the response if security checks have caught
		 * nasty things such as a cacheable cookie.
		 */
		if (((txn->flags & (TX_CACHEABLE | TX_CACHE_COOK | TX_SCK_PRESENT)) ==
		     (TX_CACHEABLE | TX_CACHE_COOK | TX_SCK_PRESENT)) &&
		    (t->be->options & PR_O_CHK_CACHE)) {

			/* we're in presence of a cacheable response containing
			 * a set-cookie header. We'll block it as requested by
			 * the 'checkcache' option, and send an alert.
			 */
			if (t->srv)
				t->srv->counters.failed_secu++;

			cur_proxy->counters.denied_resp++;
			if (t->listener->counters)
				t->listener->counters->denied_resp++;

			Alert("Blocking cacheable cookie in response from instance %s, server %s.\n",
			      t->be->id, t->srv?t->srv->id:"<dispatch>");
			send_log(t->be, LOG_ALERT,
				 "Blocking cacheable cookie in response from instance %s, server %s.\n",
				 t->be->id, t->srv?t->srv->id:"<dispatch>");
			goto return_srv_prx_502;
		}

		/*
		 * 8: adjust "Connection: close" or "Connection: keep-alive" if needed.
		 */
		if (((txn->flags & TX_CON_WANT_MSK) != TX_CON_WANT_TUN) ||
		    ((t->fe->options|t->be->options) & PR_O_HTTP_CLOSE)) {
			unsigned int want_flags = 0;

			if ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL ||
			    (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL) {
				/* we want a keep-alive response here. Keep-alive header
				 * required if either side is not 1.1.
				 */
				if ((txn->flags & (TX_REQ_VER_11|TX_RES_VER_11)) != (TX_REQ_VER_11|TX_RES_VER_11))
					want_flags |= TX_CON_KAL_SET;
			}
			else {
				/* we want a close response here. Close header required if
				 * the server is 1.1, regardless of the client.
				 */
				if (txn->flags & TX_RES_VER_11)
					want_flags |= TX_CON_CLO_SET;
			}

			if (want_flags != (txn->flags & (TX_CON_CLO_SET|TX_CON_KAL_SET)))
				http_change_connection_header(txn, msg, rep, want_flags);
		}

	skip_header_mangling:
		if ((txn->flags & TX_RES_XFER_LEN) ||
		    (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_TUN)
			rep->analysers |= AN_RES_HTTP_XFER_BODY;

		/*************************************************************
		 * OK, that's finished for the headers. We have done what we *
		 * could. Let's switch to the DATA state.                    *
		 ************************************************************/

		t->logs.t_data = tv_ms_elapsed(&t->logs.tv_accept, &now);

		/* if the user wants to log as soon as possible, without counting
		 * bytes from the server, then this is the right moment. We have
		 * to temporarily assign bytes_out to log what we currently have.
		 */
		if (t->fe->to_log && !(t->logs.logwait & LW_BYTES)) {
			t->logs.t_close = t->logs.t_data; /* to get a valid end date */
			t->logs.bytes_out = txn->rsp.eoh;
			t->do_log(t);
			t->logs.bytes_out = 0;
		}

		/* Note: we must not try to cheat by jumping directly to DATA,
		 * otherwise we would not let the client side wake up.
		 */

		return 1;
	}
	return 1;
}

/* This function is an analyser which forwards response body (including chunk
 * sizes if any). It is called as soon as we must forward, even if we forward
 * zero byte. The only situation where it must not be called is when we're in
 * tunnel mode and we want to forward till the close. It's used both to forward
 * remaining data and to resync after end of body. It expects the msg_state to
 * be between MSG_BODY and MSG_DONE (inclusive). It returns zero if it needs to
 * read more data, or 1 once we can go on with next request or end the session.
 * When in MSG_DATA or MSG_TRAILERS, it will automatically forward hdr_content_len
 * bytes of pending data + the headers if not already done (between som and sov).
 * It eventually adjusts som to match sov after the data in between have been sent.
 */
int http_response_forward_body(struct session *s, struct buffer *res, int an_bit)
{
	struct http_txn *txn = &s->txn;
	struct http_msg *msg = &s->txn.rsp;

	if (unlikely(msg->msg_state < HTTP_MSG_BODY))
		return 0;

	if ((res->flags & (BF_READ_ERROR|BF_READ_TIMEOUT|BF_WRITE_ERROR|BF_WRITE_TIMEOUT)) ||
	    ((res->flags & BF_SHUTW) && (res->to_forward || res->send_max)) ||
	    !s->req->analysers) {
		/* Output closed while we were sending data. We must abort and
		 * wake the other side up.
		 */
		msg->msg_state = HTTP_MSG_ERROR;
		http_resync_states(s);
		return 1;
	}

	/* in most states, we should abort in case of early close */
	buffer_auto_close(res);

	if (msg->msg_state < HTTP_MSG_CHUNK_SIZE) {
		/* we have msg->col and msg->sov which both point to the first
		 * byte of message body. msg->som still points to the beginning
		 * of the message. We must save the body in req->lr because it
		 * survives buffer re-alignments.
		 */
		res->lr = res->data + msg->sov;
		if (txn->flags & TX_RES_TE_CHNK)
			msg->msg_state = HTTP_MSG_CHUNK_SIZE;
		else {
			msg->msg_state = HTTP_MSG_DATA;
		}
	}

	while (1) {
		http_silent_debug(__LINE__, s);
		/* we may have some data pending */
		if (msg->hdr_content_len || msg->som != msg->sov) {
			int bytes = msg->sov - msg->som;
			if (bytes < 0) /* sov may have wrapped at the end */
				bytes += res->size;
			buffer_forward(res, bytes + msg->hdr_content_len);
			msg->hdr_content_len = 0; /* don't forward that again */
			msg->som = msg->sov;
		}

		if (msg->msg_state == HTTP_MSG_DATA) {
			/* must still forward */
			if (res->to_forward)
				goto missing_data;

			/* nothing left to forward */
			if (txn->flags & TX_RES_TE_CHNK)
				msg->msg_state = HTTP_MSG_DATA_CRLF;
			else
				msg->msg_state = HTTP_MSG_DONE;
		}
		else if (msg->msg_state == HTTP_MSG_CHUNK_SIZE) {
			/* read the chunk size and assign it to ->hdr_content_len, then
			 * set ->sov to point to the body and switch to DATA or TRAILERS state.
			 */
			int ret = http_parse_chunk_size(res, msg);

			if (!ret)
				goto missing_data;
			else if (ret < 0) {
				if (msg->err_pos >= 0)
					http_capture_bad_message(&s->be->invalid_rep, s, res, msg, HTTP_MSG_CHUNK_SIZE, s->fe);
				goto return_bad_res;
			}
			/* otherwise we're in HTTP_MSG_DATA or HTTP_MSG_TRAILERS state */
			/* Don't set a PUSH at the end of that chunk if it's not the last one */
			if (msg->msg_state == HTTP_MSG_DATA)
				res->flags |= BF_EXPECT_MORE;
		}
		else if (msg->msg_state == HTTP_MSG_DATA_CRLF) {
			/* we want the CRLF after the data */
			int ret;

			res->lr = res->w + res->send_max;
			if (res->lr >= res->data + res->size)
				res->lr -= res->size;

			ret = http_skip_chunk_crlf(res, msg);

			if (!ret)
				goto missing_data;
			else if (ret < 0) {
				if (msg->err_pos >= 0)
					http_capture_bad_message(&s->be->invalid_rep, s, res, msg, HTTP_MSG_DATA_CRLF, s->fe);
				goto return_bad_res;
			}
			/* we're in MSG_CHUNK_SIZE now */
		}
		else if (msg->msg_state == HTTP_MSG_TRAILERS) {
			int ret = http_forward_trailers(res, msg);

			if (ret == 0)
				goto missing_data;
			else if (ret < 0) {
				if (msg->err_pos >= 0)
					http_capture_bad_message(&s->be->invalid_rep, s, res, msg, HTTP_MSG_TRAILERS, s->fe);
				goto return_bad_res;
			}
			/* we're in HTTP_MSG_DONE now */
		}
		else {
			int old_state = msg->msg_state;

			/* other states, DONE...TUNNEL */
			/* for keep-alive we don't want to forward closes on DONE */
			if ((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL ||
			    (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL)
				buffer_dont_close(res);
			if (http_resync_states(s)) {
				http_silent_debug(__LINE__, s);
				/* some state changes occurred, maybe the analyser
				 * was disabled too.
				 */
				if (unlikely(msg->msg_state == HTTP_MSG_ERROR)) {
					if (res->flags & BF_SHUTW) {
						/* response errors are most likely due to
						 * the client aborting the transfer.
						 */
						goto aborted_xfer;
					}
					if (msg->err_pos >= 0)
						http_capture_bad_message(&s->be->invalid_rep, s, res, msg, old_state, s->fe);
					goto return_bad_res;
				}
				return 1;
			}
			return 0;
		}
	}

 missing_data:
	/* stop waiting for data if the input is closed before the end */
	if (res->flags & BF_SHUTR) {
		if (!(s->flags & SN_ERR_MASK))
			s->flags |= SN_ERR_SRVCL;
		s->be->counters.srv_aborts++;
		if (s->srv)
			s->srv->counters.srv_aborts++;
		goto return_bad_res_stats_ok;
	}

	if (res->flags & BF_SHUTW)
		goto aborted_xfer;

	/* we need to obey the req analyser, so if it leaves, we must too */
	if (!s->req->analysers)
		goto return_bad_res;

	/* forward the chunk size as well as any pending data */
	if (msg->hdr_content_len || msg->som != msg->sov) {
		buffer_forward(res, msg->sov - msg->som + msg->hdr_content_len);
		msg->hdr_content_len = 0; /* don't forward that again */
		msg->som = msg->sov;
	}

	/* When TE: chunked is used, we need to get there again to parse remaining
	 * chunks even if the server has closed, so we don't want to set BF_DONTCLOSE.
	 * Similarly, with keep-alive on the client side, we don't want to forward a
	 * close.
	 */
	if ((txn->flags & TX_RES_TE_CHNK) ||
	    (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL ||
	    (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL)
		buffer_dont_close(res);

	/* the session handler will take care of timeouts and errors */
	http_silent_debug(__LINE__, s);
	return 0;

 return_bad_res: /* let's centralize all bad responses */
	s->be->counters.failed_resp++;
	if (s->srv)
		s->srv->counters.failed_resp++;

 return_bad_res_stats_ok:
	txn->rsp.msg_state = HTTP_MSG_ERROR;
	/* don't send any error message as we're in the body */
	stream_int_retnclose(res->cons, NULL);
	res->analysers = 0;
	s->req->analysers = 0; /* we're in data phase, we want to abort both directions */
	if (s->srv)
		health_adjust(s->srv, HANA_STATUS_HTTP_HDRRSP);

	if (!(s->flags & SN_ERR_MASK))
		s->flags |= SN_ERR_PRXCOND;
	if (!(s->flags & SN_FINST_MASK))
		s->flags |= SN_FINST_D;
	return 0;

 aborted_xfer:
	txn->rsp.msg_state = HTTP_MSG_ERROR;
	/* don't send any error message as we're in the body */
	stream_int_retnclose(res->cons, NULL);
	res->analysers = 0;
	s->req->analysers = 0; /* we're in data phase, we want to abort both directions */

	s->fe->counters.cli_aborts++;
	if (s->fe != s->be)
		s->be->counters.cli_aborts++;
	if (s->srv)
		s->srv->counters.cli_aborts++;

	if (!(s->flags & SN_ERR_MASK))
		s->flags |= SN_ERR_CLICL;
	if (!(s->flags & SN_FINST_MASK))
		s->flags |= SN_FINST_D;
	return 0;
}

/* Iterate the same filter through all request headers.
 * Returns 1 if this filter can be stopped upon return, otherwise 0.
 * Since it can manage the switch to another backend, it updates the per-proxy
 * DENY stats.
 */
int apply_filter_to_req_headers(struct session *t, struct buffer *req, struct hdr_exp *exp)
{
	char term;
	char *cur_ptr, *cur_end, *cur_next;
	int cur_idx, old_idx, last_hdr;
	struct http_txn *txn = &t->txn;
	struct hdr_idx_elem *cur_hdr;
	int len, delta;

	last_hdr = 0;

	cur_next = txn->req.sol + hdr_idx_first_pos(&txn->hdr_idx);
	old_idx = 0;

	while (!last_hdr) {
		if (unlikely(txn->flags & (TX_CLDENY | TX_CLTARPIT)))
			return 1;
		else if (unlikely(txn->flags & TX_CLALLOW) &&
			 (exp->action == ACT_ALLOW ||
			  exp->action == ACT_DENY ||
			  exp->action == ACT_TARPIT))
			return 0;

		cur_idx = txn->hdr_idx.v[old_idx].next;
		if (!cur_idx)
			break;

		cur_hdr  = &txn->hdr_idx.v[cur_idx];
		cur_ptr  = cur_next;
		cur_end  = cur_ptr + cur_hdr->len;
		cur_next = cur_end + cur_hdr->cr + 1;

		/* Now we have one header between cur_ptr and cur_end,
		 * and the next header starts at cur_next.
		 */

		/* The annoying part is that pattern matching needs
		 * that we modify the contents to null-terminate all
		 * strings before testing them.
		 */

		term = *cur_end;
		*cur_end = '\0';

		if (regexec(exp->preg, cur_ptr, MAX_MATCH, pmatch, 0) == 0) {
			switch (exp->action) {
			case ACT_SETBE:
				/* It is not possible to jump a second time.
				 * FIXME: should we return an HTTP/500 here so that
				 * the admin knows there's a problem ?
				 */
				if (t->be != t->fe)
					break;

				/* Swithing Proxy */
				session_set_backend(t, (struct proxy *)exp->replace);
				last_hdr = 1;
				break;

			case ACT_ALLOW:
				txn->flags |= TX_CLALLOW;
				last_hdr = 1;
				break;

			case ACT_DENY:
				txn->flags |= TX_CLDENY;
				last_hdr = 1;

				t->be->counters.denied_req++;
				if (t->listener->counters)
					t->listener->counters->denied_req++;

				break;

			case ACT_TARPIT:
				txn->flags |= TX_CLTARPIT;
				last_hdr = 1;

				t->be->counters.denied_req++;
				if (t->listener->counters)
					t->listener->counters->denied_req++;

				break;

			case ACT_REPLACE:
				len = exp_replace(trash, cur_ptr, exp->replace, pmatch);
				delta = buffer_replace2(req, cur_ptr, cur_end, trash, len);
				/* FIXME: if the user adds a newline in the replacement, the
				 * index will not be recalculated for now, and the new line
				 * will not be counted as a new header.
				 */

				cur_end += delta;
				cur_next += delta;
				cur_hdr->len += delta;
				http_msg_move_end(&txn->req, delta);
				break;

			case ACT_REMOVE:
				delta = buffer_replace2(req, cur_ptr, cur_next, NULL, 0);
				cur_next += delta;

				http_msg_move_end(&txn->req, delta);
				txn->hdr_idx.v[old_idx].next = cur_hdr->next;
				txn->hdr_idx.used--;
				cur_hdr->len = 0;
				cur_end = NULL; /* null-term has been rewritten */
				cur_idx = old_idx;
				break;

			}
		}
		if (cur_end)
			*cur_end = term; /* restore the string terminator */

		/* keep the link from this header to next one in case of later
		 * removal of next header.
		 */
		old_idx = cur_idx;
	}
	return 0;
}


/* Apply the filter to the request line.
 * Returns 0 if nothing has been done, 1 if the filter has been applied,
 * or -1 if a replacement resulted in an invalid request line.
 * Since it can manage the switch to another backend, it updates the per-proxy
 * DENY stats.
 */
int apply_filter_to_req_line(struct session *t, struct buffer *req, struct hdr_exp *exp)
{
	char term;
	char *cur_ptr, *cur_end;
	int done;
	struct http_txn *txn = &t->txn;
	int len, delta;


	if (unlikely(txn->flags & (TX_CLDENY | TX_CLTARPIT)))
		return 1;
	else if (unlikely(txn->flags & TX_CLALLOW) &&
		 (exp->action == ACT_ALLOW ||
		  exp->action == ACT_DENY ||
		  exp->action == ACT_TARPIT))
		return 0;
	else if (exp->action == ACT_REMOVE)
		return 0;

	done = 0;

	cur_ptr = txn->req.sol;
	cur_end = cur_ptr + txn->req.sl.rq.l;

	/* Now we have the request line between cur_ptr and cur_end */

	/* The annoying part is that pattern matching needs
	 * that we modify the contents to null-terminate all
	 * strings before testing them.
	 */

	term = *cur_end;
	*cur_end = '\0';

	if (regexec(exp->preg, cur_ptr, MAX_MATCH, pmatch, 0) == 0) {
		switch (exp->action) {
		case ACT_SETBE:
			/* It is not possible to jump a second time.
			 * FIXME: should we return an HTTP/500 here so that
			 * the admin knows there's a problem ?
			 */
			if (t->be != t->fe)
				break;

			/* Swithing Proxy */
			session_set_backend(t, (struct proxy *)exp->replace);
			done = 1;
			break;

		case ACT_ALLOW:
			txn->flags |= TX_CLALLOW;
			done = 1;
			break;

		case ACT_DENY:
			txn->flags |= TX_CLDENY;

			t->be->counters.denied_req++;
			if (t->listener->counters)
				t->listener->counters->denied_req++;

			done = 1;
			break;

		case ACT_TARPIT:
			txn->flags |= TX_CLTARPIT;

			t->be->counters.denied_req++;
			if (t->listener->counters)
				t->listener->counters->denied_req++;

			done = 1;
			break;

		case ACT_REPLACE:
			*cur_end = term; /* restore the string terminator */
			len = exp_replace(trash, cur_ptr, exp->replace, pmatch);
			delta = buffer_replace2(req, cur_ptr, cur_end, trash, len);
			/* FIXME: if the user adds a newline in the replacement, the
			 * index will not be recalculated for now, and the new line
			 * will not be counted as a new header.
			 */

			http_msg_move_end(&txn->req, delta);
			cur_end += delta;
			cur_end = (char *)http_parse_reqline(&txn->req, req->data,
							     HTTP_MSG_RQMETH,
							     cur_ptr, cur_end + 1,
							     NULL, NULL);
			if (unlikely(!cur_end))
				return -1;

			/* we have a full request and we know that we have either a CR
			 * or an LF at <ptr>.
			 */
			txn->meth = find_http_meth(cur_ptr, txn->req.sl.rq.m_l);
			hdr_idx_set_start(&txn->hdr_idx, txn->req.sl.rq.l, *cur_end == '\r');
			/* there is no point trying this regex on headers */
			return 1;
		}
	}
	*cur_end = term; /* restore the string terminator */
	return done;
}


/*
 * Apply all the req filters of proxy <px> to all headers in buffer <req> of session <s>.
 * Returns 0 if everything is alright, or -1 in case a replacement lead to an
 * unparsable request. Since it can manage the switch to another backend, it
 * updates the per-proxy DENY stats.
 */
int apply_filters_to_request(struct session *s, struct buffer *req, struct proxy *px)
{
	struct http_txn *txn = &s->txn;
	struct hdr_exp *exp;

	for (exp = px->req_exp; exp; exp = exp->next) {
		int ret;

		/*
		 * The interleaving of transformations and verdicts
		 * makes it difficult to decide to continue or stop
		 * the evaluation.
		 */

		if (txn->flags & (TX_CLDENY|TX_CLTARPIT))
			break;

		if ((txn->flags & TX_CLALLOW) &&
		    (exp->action == ACT_ALLOW || exp->action == ACT_DENY ||
		     exp->action == ACT_TARPIT || exp->action == ACT_PASS))
			continue;

		/* if this filter had a condition, evaluate it now and skip to
		 * next filter if the condition does not match.
		 */
		if (exp->cond) {
			ret = acl_exec_cond(exp->cond, px, s, txn, ACL_DIR_REQ);
			ret = acl_pass(ret);
			if (((struct acl_cond *)exp->cond)->pol == ACL_COND_UNLESS)
				ret = !ret;

			if (!ret)
				continue;
		}

		/* Apply the filter to the request line. */
		ret = apply_filter_to_req_line(s, req, exp);
		if (unlikely(ret < 0))
			return -1;

		if (likely(ret == 0)) {
			/* The filter did not match the request, it can be
			 * iterated through all headers.
			 */
			apply_filter_to_req_headers(s, req, exp);
		}
	}
	return 0;
}


/*
 * Try to retrieve the server associated to the appsession.
 * If the server is found, it's assigned to the session.
 */
void manage_client_side_appsession(struct session *t, const char *buf, int len) {
	struct http_txn *txn = &t->txn;
	appsess *asession = NULL;
	char *sessid_temp = NULL;

	if (len > t->be->appsession_len) {
		len = t->be->appsession_len;
	}

	if (t->be->options2 & PR_O2_AS_REQL) {
		/* request-learn option is enabled : store the sessid in the session for future use */
		if (txn->sessid != NULL) {
			/* free previously allocated memory as we don't need the session id found in the URL anymore */
			pool_free2(apools.sessid, txn->sessid);
		}

		if ((txn->sessid = pool_alloc2(apools.sessid)) == NULL) {
			Alert("Not enough memory process_cli():asession->sessid:malloc().\n");
			send_log(t->be, LOG_ALERT, "Not enough memory process_cli():asession->sessid:malloc().\n");
			return;
		}

		memcpy(txn->sessid, buf, len);
		txn->sessid[len] = 0;
	}

	if ((sessid_temp = pool_alloc2(apools.sessid)) == NULL) {
		Alert("Not enough memory process_cli():asession->sessid:malloc().\n");
		send_log(t->be, LOG_ALERT, "Not enough memory process_cli():asession->sessid:malloc().\n");
		return;
	}

	memcpy(sessid_temp, buf, len);
	sessid_temp[len] = 0;

	asession = appsession_hash_lookup(&(t->be->htbl_proxy), sessid_temp);
	/* free previously allocated memory */
	pool_free2(apools.sessid, sessid_temp);

	if (asession != NULL) {
		asession->expire = tick_add_ifset(now_ms, t->be->timeout.appsession);
		if (!(t->be->options2 & PR_O2_AS_REQL))
			asession->request_count++;

		if (asession->serverid != NULL) {
			struct server *srv = t->be->srv;

			while (srv) {
				if (strcmp(srv->id, asession->serverid) == 0) {
					if ((srv->state & SRV_RUNNING) ||
					    (t->be->options & PR_O_PERSIST) ||
					    (t->flags & SN_FORCE_PRST)) {
						/* we found the server and it's usable */
						txn->flags &= ~TX_CK_MASK;
						txn->flags |= (srv->state & SRV_RUNNING) ? TX_CK_VALID : TX_CK_DOWN;
						t->flags |= SN_DIRECT | SN_ASSIGNED;
						t->srv = srv;
						break;
					} else {
						txn->flags &= ~TX_CK_MASK;
						txn->flags |= TX_CK_DOWN;
					}
				}
				srv = srv->next;
			}
		}
	}
}

/* Find the end of a cookie value contained between <s> and <e>. It works the
 * same way as with headers above except that the semi-colon also ends a token.
 * See RFC2965 for more information. Note that it requires a valid header to
 * return a valid result.
 */
char *find_cookie_value_end(char *s, const char *e)
{
	int quoted, qdpair;

	quoted = qdpair = 0;
	for (; s < e; s++) {
		if (qdpair)                    qdpair = 0;
		else if (quoted) {
			if (*s == '\\')        qdpair = 1;
			else if (*s == '"')    quoted = 0;
		}
		else if (*s == '"')            quoted = 1;
		else if (*s == ',' || *s == ';') return s;
	}
	return s;
}

/* Delete a value in a header between delimiters <from> and <next> in buffer
 * <buf>. The number of characters displaced is returned, and the pointer to
 * the first delimiter is updated if required. The function tries as much as
 * possible to respect the following principles :
 *  - replace <from> delimiter by the <next> one unless <from> points to a
 *    colon, in which case <next> is simply removed
 *  - set exactly one space character after the new first delimiter, unless
 *    there are not enough characters in the block being moved to do so.
 *  - remove unneeded spaces before the previous delimiter and after the new
 *    one.
 *
 * It is the caller's responsibility to ensure that :
 *   - <from> points to a valid delimiter or the colon ;
 *   - <next> points to a valid delimiter or the final CR/LF ;
 *   - there are non-space chars before <from> ;
 *   - there is a CR/LF at or after <next>.
 */
int del_hdr_value(struct buffer *buf, char **from, char *next)
{
	char *prev = *from;

	if (*prev == ':') {
		/* We're removing the first value, preserve the colon and add a
		 * space if possible.
		 */
		if (!http_is_crlf[(unsigned char)*next])
			next++;
		prev++;
		if (prev < next)
			*prev++ = ' ';

		while (http_is_spht[(unsigned char)*next])
			next++;
	} else {
		/* Remove useless spaces before the old delimiter. */
		while (http_is_spht[(unsigned char)*(prev-1)])
			prev--;
		*from = prev;

		/* copy the delimiter and if possible a space if we're
		 * not at the end of the line.
		 */
		if (!http_is_crlf[(unsigned char)*next]) {
			*prev++ = *next++;
			if (prev + 1 < next)
				*prev++ = ' ';
			while (http_is_spht[(unsigned char)*next])
				next++;
		}
	}
	return buffer_replace2(buf, prev, next, NULL, 0);
}

/*
 * Manage client-side cookie. It can impact performance by about 2% so it is
 * desirable to call it only when needed. This code is quite complex because
 * of the multiple very crappy and ambiguous syntaxes we have to support. it
 * highly recommended not to touch this part without a good reason !
 */
void manage_client_side_cookies(struct session *t, struct buffer *req)
{
	struct http_txn *txn = &t->txn;
	int preserve_hdr;
	int cur_idx, old_idx;
	char *hdr_beg, *hdr_end, *hdr_next, *del_from;
	char *prev, *att_beg, *att_end, *equal, *val_beg, *val_end, *next;

	/* Iterate through the headers, we start with the start line. */
	old_idx = 0;
	hdr_next = txn->req.sol + hdr_idx_first_pos(&txn->hdr_idx);

	while ((cur_idx = txn->hdr_idx.v[old_idx].next)) {
		struct hdr_idx_elem *cur_hdr;
		int val;

		cur_hdr  = &txn->hdr_idx.v[cur_idx];
		hdr_beg  = hdr_next;
		hdr_end  = hdr_beg + cur_hdr->len;
		hdr_next = hdr_end + cur_hdr->cr + 1;

		/* We have one full header between hdr_beg and hdr_end, and the
		 * next header starts at hdr_next. We're only interested in
		 * "Cookie:" headers.
		 */

		val = http_header_match2(hdr_beg, hdr_end, "Cookie", 6);
		if (!val) {
			old_idx = cur_idx;
			continue;
		}

		del_from = NULL;  /* nothing to be deleted */
		preserve_hdr = 0; /* assume we may kill the whole header */

		/* Now look for cookies. Conforming to RFC2109, we have to support
		 * attributes whose name begin with a '$', and associate them with
		 * the right cookie, if we want to delete this cookie.
		 * So there are 3 cases for each cookie read :
		 * 1) it's a special attribute, beginning with a '$' : ignore it.
		 * 2) it's a server id cookie that we *MAY* want to delete : save
		 *    some pointers on it (last semi-colon, beginning of cookie...)
		 * 3) it's an application cookie : we *MAY* have to delete a previous
		 *    "special" cookie.
		 * At the end of loop, if a "special" cookie remains, we may have to
		 * remove it. If no application cookie persists in the header, we
		 * *MUST* delete it.
		 *
		 * Note: RFC2965 is unclear about the processing of spaces around
		 * the equal sign in the ATTR=VALUE form. A careful inspection of
		 * the RFC explicitly allows spaces before it, and not within the
		 * tokens (attrs or values). An inspection of RFC2109 allows that
		 * too but section 10.1.3 lets one think that spaces may be allowed
		 * after the equal sign too, resulting in some (rare) buggy
		 * implementations trying to do that. So let's do what servers do.
		 * Latest ietf draft forbids spaces all around. Also, earlier RFCs
		 * allowed quoted strings in values, with any possible character
		 * after a backslash, including control chars and delimitors, which
		 * causes parsing to become ambiguous. Browsers also allow spaces
		 * within values even without quotes.
		 *
		 * We have to keep multiple pointers in order to support cookie
		 * removal at the beginning, middle or end of header without
		 * corrupting the header. All of these headers are valid :
		 *
		 * Cookie:NAME1=VALUE1;NAME2=VALUE2;NAME3=VALUE3\r\n
		 * Cookie:NAME1=VALUE1;NAME2_ONLY ;NAME3=VALUE3\r\n
		 * Cookie:    NAME1  =  VALUE 1  ; NAME2 = VALUE2 ; NAME3 = VALUE3\r\n
		 * |     |    |    | |  |      | |                                |
		 * |     |    |    | |  |      | |                     hdr_end <--+
		 * |     |    |    | |  |      | +--> next
		 * |     |    |    | |  |      +----> val_end
		 * |     |    |    | |  +-----------> val_beg
		 * |     |    |    | +--------------> equal
		 * |     |    |    +----------------> att_end
		 * |     |    +---------------------> att_beg
		 * |     +--------------------------> prev
		 * +--------------------------------> hdr_beg
		 */

		for (prev = hdr_beg + 6; prev < hdr_end; prev = next) {
			/* Iterate through all cookies on this line */

			/* find att_beg */
			att_beg = prev + 1;
			while (att_beg < hdr_end && http_is_spht[(unsigned char)*att_beg])
				att_beg++;

			/* find att_end : this is the first character after the last non
			 * space before the equal. It may be equal to hdr_end.
			 */
			equal = att_end = att_beg;

			while (equal < hdr_end) {
				if (*equal == '=' || *equal == ',' || *equal == ';')
					break;
				if (http_is_spht[(unsigned char)*equal++])
					continue;
				att_end = equal;
			}

			/* here, <equal> points to '=', a delimitor or the end. <att_end>
			 * is between <att_beg> and <equal>, both may be identical.
			 */

			/* look for end of cookie if there is an equal sign */
			if (equal < hdr_end && *equal == '=') {
				/* look for the beginning of the value */
				val_beg = equal + 1;
				while (val_beg < hdr_end && http_is_spht[(unsigned char)*val_beg])
					val_beg++;

				/* find the end of the value, respecting quotes */
				next = find_cookie_value_end(val_beg, hdr_end);

				/* make val_end point to the first white space or delimitor after the value */
				val_end = next;
				while (val_end > val_beg && http_is_spht[(unsigned char)*(val_end - 1)])
					val_end--;
			} else {
				val_beg = val_end = next = equal;
			}

			/* We have nothing to do with attributes beginning with '$'. However,
			 * they will automatically be removed if a header before them is removed,
			 * since they're supposed to be linked together.
			 */
			if (*att_beg == '$')
				continue;

			/* Ignore cookies with no equal sign */
			if (equal == next) {
				/* This is not our cookie, so we must preserve it. But if we already
				 * scheduled another cookie for removal, we cannot remove the
				 * complete header, but we can remove the previous block itself.
				 */
				preserve_hdr = 1;
				if (del_from != NULL) {
					int delta = del_hdr_value(req, &del_from, prev);
					val_end  += delta;
					next     += delta;
					hdr_end  += delta;
					hdr_next += delta;
					cur_hdr->len += delta;
					http_msg_move_end(&txn->req, delta);
					prev     = del_from;
					del_from = NULL;
				}
				continue;
			}

			/* if there are spaces around the equal sign, we need to
			 * strip them otherwise we'll get trouble for cookie captures,
			 * or even for rewrites. Since this happens extremely rarely,
			 * it does not hurt performance.
			 */
			if (unlikely(att_end != equal || val_beg > equal + 1)) {
				int stripped_before = 0;
				int stripped_after = 0;

				if (att_end != equal) {
					stripped_before = buffer_replace2(req, att_end, equal, NULL, 0);
					equal   += stripped_before;
					val_beg += stripped_before;
				}

				if (val_beg > equal + 1) {
					stripped_after = buffer_replace2(req, equal + 1, val_beg, NULL, 0);
					val_beg += stripped_after;
					stripped_before += stripped_after;
				}

				val_end      += stripped_before;
				next         += stripped_before;
				hdr_end      += stripped_before;
				hdr_next     += stripped_before;
				cur_hdr->len += stripped_before;
				http_msg_move_end(&txn->req, stripped_before);
			}
			/* now everything is as on the diagram above */

			/* First, let's see if we want to capture this cookie. We check
			 * that we don't already have a client side cookie, because we
			 * can only capture one. Also as an optimisation, we ignore
			 * cookies shorter than the declared name.
			 */
			if (t->fe->capture_name != NULL && txn->cli_cookie == NULL &&
			    (val_end - att_beg >= t->fe->capture_namelen) &&
			    memcmp(att_beg, t->fe->capture_name, t->fe->capture_namelen) == 0) {
				int log_len = val_end - att_beg;

				if ((txn->cli_cookie = pool_alloc2(pool2_capture)) == NULL) {
					Alert("HTTP logging : out of memory.\n");
				} else {
					if (log_len > t->fe->capture_len)
						log_len = t->fe->capture_len;
					memcpy(txn->cli_cookie, att_beg, log_len);
					txn->cli_cookie[log_len] = 0;
				}
			}

			/* Persistence cookies in passive, rewrite or insert mode have the
			 * following form :
			 *
			 *    Cookie: NAME=SRV[|<lastseen>[|<firstseen>]]
			 *
			 * For cookies in prefix mode, the form is :
			 *
			 *    Cookie: NAME=SRV~VALUE
			 */
			if ((att_end - att_beg == t->be->cookie_len) && (t->be->cookie_name != NULL) &&
			    (memcmp(att_beg, t->be->cookie_name, att_end - att_beg) == 0)) {
				struct server *srv = t->be->srv;
				char *delim;

				/* if we're in cookie prefix mode, we'll search the delimitor so that we
				 * have the server ID between val_beg and delim, and the original cookie between
				 * delim+1 and val_end. Otherwise, delim==val_end :
				 *
				 * Cookie: NAME=SRV;          # in all but prefix modes
				 * Cookie: NAME=SRV~OPAQUE ;  # in prefix mode
				 * |      ||   ||  |      |+-> next
				 * |      ||   ||  |      +--> val_end
				 * |      ||   ||  +---------> delim
				 * |      ||   |+------------> val_beg
				 * |      ||   +-------------> att_end = equal
				 * |      |+-----------------> att_beg
				 * |      +------------------> prev
				 * +-------------------------> hdr_beg
				 */

				if (t->be->options & PR_O_COOK_PFX) {
					for (delim = val_beg; delim < val_end; delim++)
						if (*delim == COOKIE_DELIM)
							break;
				} else {
					char *vbar1;
					delim = val_end;
					/* Now check if the cookie contains a date field, which would
					 * appear after a vertical bar ('|') just after the server name
					 * and before the delimiter.
					 */
					vbar1 = memchr(val_beg, COOKIE_DELIM_DATE, val_end - val_beg);
					if (vbar1) {
						/* OK, so left of the bar is the server's cookie and
						 * right is the last seen date. It is a base64 encoded
						 * 30-bit value representing the UNIX date since the
						 * epoch in 4-second quantities.
						 */
						int val;
						delim = vbar1++;
						if (val_end - vbar1 >= 5) {
							val = b64tos30(vbar1);
							if (val > 0)
								txn->cookie_last_date = val << 2;
						}
						/* look for a second vertical bar */
						vbar1 = memchr(vbar1, COOKIE_DELIM_DATE, val_end - vbar1);
						if (vbar1 && (val_end - vbar1 > 5)) {
							val = b64tos30(vbar1 + 1);
							if (val > 0)
								txn->cookie_first_date = val << 2;
						}
					}
				}

				/* if the cookie has an expiration date and the proxy wants to check
				 * it, then we do that now. We first check if the cookie is too old,
				 * then only if it has expired. We detect strict overflow because the
				 * time resolution here is not great (4 seconds). Cookies with dates
				 * in the future are ignored if their offset is beyond one day. This
				 * allows an admin to fix timezone issues without expiring everyone
				 * and at the same time avoids keeping unwanted side effects for too
				 * long.
				 */
				if (txn->cookie_first_date && t->be->cookie_maxlife &&
				    (((signed)(date.tv_sec - txn->cookie_first_date) > (signed)t->be->cookie_maxlife) ||
				     ((signed)(txn->cookie_first_date - date.tv_sec) > 86400))) {
					txn->flags &= ~TX_CK_MASK;
					txn->flags |= TX_CK_OLD;
					delim = val_beg; // let's pretend we have not found the cookie
					txn->cookie_first_date = 0;
					txn->cookie_last_date = 0;
				}
				else if (txn->cookie_last_date && t->be->cookie_maxidle &&
					 (((signed)(date.tv_sec - txn->cookie_last_date) > (signed)t->be->cookie_maxidle) ||
					  ((signed)(txn->cookie_last_date - date.tv_sec) > 86400))) {
					txn->flags &= ~TX_CK_MASK;
					txn->flags |= TX_CK_EXPIRED;
					delim = val_beg; // let's pretend we have not found the cookie
					txn->cookie_first_date = 0;
					txn->cookie_last_date = 0;
				}

				/* Here, we'll look for the first running server which supports the cookie.
				 * This allows to share a same cookie between several servers, for example
				 * to dedicate backup servers to specific servers only.
				 * However, to prevent clients from sticking to cookie-less backup server
				 * when they have incidentely learned an empty cookie, we simply ignore
				 * empty cookies and mark them as invalid.
				 * The same behaviour is applied when persistence must be ignored.
				 */
				if ((delim == val_beg) || (t->flags & SN_IGNORE_PRST))
					srv = NULL;

				while (srv) {
					if (srv->cookie && (srv->cklen == delim - val_beg) &&
					    !memcmp(val_beg, srv->cookie, delim - val_beg)) {
						if ((srv->state & SRV_RUNNING) ||
						    (t->be->options & PR_O_PERSIST) ||
						    (t->flags & SN_FORCE_PRST)) {
							/* we found the server and we can use it */
							txn->flags &= ~TX_CK_MASK;
							txn->flags |= (srv->state & SRV_RUNNING) ? TX_CK_VALID : TX_CK_DOWN;
							t->flags |= SN_DIRECT | SN_ASSIGNED;
							t->srv = srv;
							break;
						} else {
							/* we found a server, but it's down,
							 * mark it as such and go on in case
							 * another one is available.
							 */
							txn->flags &= ~TX_CK_MASK;
							txn->flags |= TX_CK_DOWN;
						}
					}
					srv = srv->next;
				}

				if (!srv && !(txn->flags & (TX_CK_DOWN|TX_CK_EXPIRED|TX_CK_OLD))) {
					/* no server matched this cookie */
					txn->flags &= ~TX_CK_MASK;
					txn->flags |= TX_CK_INVALID;
				}

				/* depending on the cookie mode, we may have to either :
				 * - delete the complete cookie if we're in insert+indirect mode, so that
				 *   the server never sees it ;
				 * - remove the server id from the cookie value, and tag the cookie as an
				 *   application cookie so that it does not get accidentely removed later,
				 *   if we're in cookie prefix mode
				 */
				if ((t->be->options & PR_O_COOK_PFX) && (delim != val_end)) {
					int delta; /* negative */

					delta = buffer_replace2(req, val_beg, delim + 1, NULL, 0);
					val_end  += delta;
					next     += delta;
					hdr_end  += delta;
					hdr_next += delta;
					cur_hdr->len += delta;
					http_msg_move_end(&txn->req, delta);

					del_from = NULL;
					preserve_hdr = 1; /* we want to keep this cookie */
				}
				else if (del_from == NULL &&
					 (t->be->options & (PR_O_COOK_INS | PR_O_COOK_IND)) == (PR_O_COOK_INS | PR_O_COOK_IND)) {
					del_from = prev;
				}
			} else {
				/* This is not our cookie, so we must preserve it. But if we already
				 * scheduled another cookie for removal, we cannot remove the
				 * complete header, but we can remove the previous block itself.
				 */
				preserve_hdr = 1;

				if (del_from != NULL) {
					int delta = del_hdr_value(req, &del_from, prev);
					if (att_beg >= del_from)
						att_beg += delta;
					if (att_end >= del_from)
						att_end += delta;
					val_beg  += delta;
					val_end  += delta;
					next     += delta;
					hdr_end  += delta;
					hdr_next += delta;
					cur_hdr->len += delta;
					http_msg_move_end(&txn->req, delta);
					prev     = del_from;
					del_from = NULL;
				}
			}

			/* Look for the appsession cookie unless persistence must be ignored */
			if (!(t->flags & SN_IGNORE_PRST) && (t->be->appsession_name != NULL)) {
				int cmp_len, value_len;
				char *value_begin;

				if (t->be->options2 & PR_O2_AS_PFX) {
					cmp_len     = MIN(val_end - att_beg, t->be->appsession_name_len);
					value_begin = att_beg + t->be->appsession_name_len;
					value_len   = val_end - att_beg - t->be->appsession_name_len;
				} else {
					cmp_len     = att_end - att_beg;
					value_begin = val_beg;
					value_len   = val_end - val_beg;
				}

				/* let's see if the cookie is our appcookie */
				if (cmp_len == t->be->appsession_name_len &&
				    memcmp(att_beg, t->be->appsession_name, cmp_len) == 0) {
					manage_client_side_appsession(t, value_begin, value_len);
				}
			}

			/* continue with next cookie on this header line */
			att_beg = next;
		} /* for each cookie */

		/* There are no more cookies on this line.
		 * We may still have one (or several) marked for deletion at the
		 * end of the line. We must do this now in two ways :
		 *  - if some cookies must be preserved, we only delete from the
		 *    mark to the end of line ;
		 *  - if nothing needs to be preserved, simply delete the whole header
		 */
		if (del_from) {
			int delta;
			if (preserve_hdr) {
				delta = del_hdr_value(req, &del_from, hdr_end);
				hdr_end = del_from;
				cur_hdr->len += delta;
			} else {
				delta = buffer_replace2(req, hdr_beg, hdr_next, NULL, 0);

				/* FIXME: this should be a separate function */
				txn->hdr_idx.v[old_idx].next = cur_hdr->next;
				txn->hdr_idx.used--;
				cur_hdr->len = 0;
				cur_idx = old_idx;
			}
			hdr_next += delta;
			http_msg_move_end(&txn->req, delta);
		}

		/* check next header */
		old_idx = cur_idx;
	}
}


/* Iterate the same filter through all response headers contained in <rtr>.
 * Returns 1 if this filter can be stopped upon return, otherwise 0.
 */
int apply_filter_to_resp_headers(struct session *t, struct buffer *rtr, struct hdr_exp *exp)
{
	char term;
	char *cur_ptr, *cur_end, *cur_next;
	int cur_idx, old_idx, last_hdr;
	struct http_txn *txn = &t->txn;
	struct hdr_idx_elem *cur_hdr;
	int len, delta;

	last_hdr = 0;

	cur_next = txn->rsp.sol + hdr_idx_first_pos(&txn->hdr_idx);
	old_idx = 0;

	while (!last_hdr) {
		if (unlikely(txn->flags & TX_SVDENY))
			return 1;
		else if (unlikely(txn->flags & TX_SVALLOW) &&
			 (exp->action == ACT_ALLOW ||
			  exp->action == ACT_DENY))
			return 0;

		cur_idx = txn->hdr_idx.v[old_idx].next;
		if (!cur_idx)
			break;

		cur_hdr  = &txn->hdr_idx.v[cur_idx];
		cur_ptr  = cur_next;
		cur_end  = cur_ptr + cur_hdr->len;
		cur_next = cur_end + cur_hdr->cr + 1;

		/* Now we have one header between cur_ptr and cur_end,
		 * and the next header starts at cur_next.
		 */

		/* The annoying part is that pattern matching needs
		 * that we modify the contents to null-terminate all
		 * strings before testing them.
		 */

		term = *cur_end;
		*cur_end = '\0';

		if (regexec(exp->preg, cur_ptr, MAX_MATCH, pmatch, 0) == 0) {
			switch (exp->action) {
			case ACT_ALLOW:
				txn->flags |= TX_SVALLOW;
				last_hdr = 1;
				break;

			case ACT_DENY:
				txn->flags |= TX_SVDENY;
				last_hdr = 1;
				break;

			case ACT_REPLACE:
				len = exp_replace(trash, cur_ptr, exp->replace, pmatch);
				delta = buffer_replace2(rtr, cur_ptr, cur_end, trash, len);
				/* FIXME: if the user adds a newline in the replacement, the
				 * index will not be recalculated for now, and the new line
				 * will not be counted as a new header.
				 */

				cur_end += delta;
				cur_next += delta;
				cur_hdr->len += delta;
				http_msg_move_end(&txn->rsp, delta);
				break;

			case ACT_REMOVE:
				delta = buffer_replace2(rtr, cur_ptr, cur_next, NULL, 0);
				cur_next += delta;

				http_msg_move_end(&txn->rsp, delta);
				txn->hdr_idx.v[old_idx].next = cur_hdr->next;
				txn->hdr_idx.used--;
				cur_hdr->len = 0;
				cur_end = NULL; /* null-term has been rewritten */
				cur_idx = old_idx;
				break;

			}
		}
		if (cur_end)
			*cur_end = term; /* restore the string terminator */

		/* keep the link from this header to next one in case of later
		 * removal of next header.
		 */
		old_idx = cur_idx;
	}
	return 0;
}


/* Apply the filter to the status line in the response buffer <rtr>.
 * Returns 0 if nothing has been done, 1 if the filter has been applied,
 * or -1 if a replacement resulted in an invalid status line.
 */
int apply_filter_to_sts_line(struct session *t, struct buffer *rtr, struct hdr_exp *exp)
{
	char term;
	char *cur_ptr, *cur_end;
	int done;
	struct http_txn *txn = &t->txn;
	int len, delta;


	if (unlikely(txn->flags & TX_SVDENY))
		return 1;
	else if (unlikely(txn->flags & TX_SVALLOW) &&
		 (exp->action == ACT_ALLOW ||
		  exp->action == ACT_DENY))
		return 0;
	else if (exp->action == ACT_REMOVE)
		return 0;

	done = 0;

	cur_ptr = txn->rsp.sol;
	cur_end = cur_ptr + txn->rsp.sl.st.l;

	/* Now we have the status line between cur_ptr and cur_end */

	/* The annoying part is that pattern matching needs
	 * that we modify the contents to null-terminate all
	 * strings before testing them.
	 */

	term = *cur_end;
	*cur_end = '\0';

	if (regexec(exp->preg, cur_ptr, MAX_MATCH, pmatch, 0) == 0) {
		switch (exp->action) {
		case ACT_ALLOW:
			txn->flags |= TX_SVALLOW;
			done = 1;
			break;

		case ACT_DENY:
			txn->flags |= TX_SVDENY;
			done = 1;
			break;

		case ACT_REPLACE:
			*cur_end = term; /* restore the string terminator */
			len = exp_replace(trash, cur_ptr, exp->replace, pmatch);
			delta = buffer_replace2(rtr, cur_ptr, cur_end, trash, len);
			/* FIXME: if the user adds a newline in the replacement, the
			 * index will not be recalculated for now, and the new line
			 * will not be counted as a new header.
			 */

			http_msg_move_end(&txn->rsp, delta);
			cur_end += delta;
			cur_end = (char *)http_parse_stsline(&txn->rsp, rtr->data,
							     HTTP_MSG_RPVER,
							     cur_ptr, cur_end + 1,
							     NULL, NULL);
			if (unlikely(!cur_end))
				return -1;

			/* we have a full respnse and we know that we have either a CR
			 * or an LF at <ptr>.
			 */
			txn->status = strl2ui(txn->rsp.sol + txn->rsp.sl.st.c, txn->rsp.sl.st.c_l);
			hdr_idx_set_start(&txn->hdr_idx, txn->rsp.sl.st.l, *cur_end == '\r');
			/* there is no point trying this regex on headers */
			return 1;
		}
	}
	*cur_end = term; /* restore the string terminator */
	return done;
}


/*
 * Apply all the resp filters of proxy <px> to all headers in buffer <rtr> of session <s>.
 * Returns 0 if everything is alright, or -1 in case a replacement lead to an
 * unparsable response.
 */
int apply_filters_to_response(struct session *s, struct buffer *rtr, struct proxy *px)
{
	struct http_txn *txn = &s->txn;
	struct hdr_exp *exp;

	for (exp = px->rsp_exp; exp; exp = exp->next) {
		int ret;

		/*
		 * The interleaving of transformations and verdicts
		 * makes it difficult to decide to continue or stop
		 * the evaluation.
		 */

		if (txn->flags & TX_SVDENY)
			break;

		if ((txn->flags & TX_SVALLOW) &&
		    (exp->action == ACT_ALLOW || exp->action == ACT_DENY ||
		     exp->action == ACT_PASS)) {
			exp = exp->next;
			continue;
		}

		/* if this filter had a condition, evaluate it now and skip to
		 * next filter if the condition does not match.
		 */
		if (exp->cond) {
			ret = acl_exec_cond(exp->cond, px, s, txn, ACL_DIR_RTR);
			ret = acl_pass(ret);
			if (((struct acl_cond *)exp->cond)->pol == ACL_COND_UNLESS)
				ret = !ret;
			if (!ret)
				continue;
		}

		/* Apply the filter to the status line. */
		ret = apply_filter_to_sts_line(s, rtr, exp);
		if (unlikely(ret < 0))
			return -1;

		if (likely(ret == 0)) {
			/* The filter did not match the response, it can be
			 * iterated through all headers.
			 */
			apply_filter_to_resp_headers(s, rtr, exp);
		}
	}
	return 0;
}


/*
 * Manage server-side cookies. It can impact performance by about 2% so it is
 * desirable to call it only when needed. This function is also used when we
 * just need to know if there is a cookie (eg: for check-cache).
 */
void manage_server_side_cookies(struct session *t, struct buffer *res)
{
	struct http_txn *txn = &t->txn;
	int is_cookie2;
	int cur_idx, old_idx, delta;
	char *hdr_beg, *hdr_end, *hdr_next;
	char *prev, *att_beg, *att_end, *equal, *val_beg, *val_end, *next;

	/* Iterate through the headers.
	 * we start with the start line.
	 */
	old_idx = 0;
	hdr_next = txn->rsp.sol + hdr_idx_first_pos(&txn->hdr_idx);

	while ((cur_idx = txn->hdr_idx.v[old_idx].next)) {
		struct hdr_idx_elem *cur_hdr;
		int val;

		cur_hdr  = &txn->hdr_idx.v[cur_idx];
		hdr_beg  = hdr_next;
		hdr_end  = hdr_beg + cur_hdr->len;
		hdr_next = hdr_end + cur_hdr->cr + 1;

		/* We have one full header between hdr_beg and hdr_end, and the
		 * next header starts at hdr_next. We're only interested in
		 * "Set-Cookie" and "Set-Cookie2" headers.
		 */

		is_cookie2 = 0;
		prev = hdr_beg + 10;
		val = http_header_match2(hdr_beg, hdr_end, "Set-Cookie", 10);
		if (!val) {
			val = http_header_match2(hdr_beg, hdr_end, "Set-Cookie2", 11);
			if (!val) {
				old_idx = cur_idx;
				continue;
			}
			is_cookie2 = 1;
			prev = hdr_beg + 11;
		}

		/* OK, right now we know we have a Set-Cookie* at hdr_beg, and
		 * <prev> points to the colon.
		 */
		txn->flags |= TX_SCK_PRESENT;

		/* Maybe we only wanted to see if there was a Set-Cookie (eg:
		 * check-cache is enabled) and we are not interested in checking
		 * them. Warning, the cookie capture is declared in the frontend.
		 */
		if (t->be->cookie_name == NULL &&
		    t->be->appsession_name == NULL &&
		    t->fe->capture_name == NULL)
			return;

		/* OK so now we know we have to process this response cookie.
		 * The format of the Set-Cookie header is slightly different
		 * from the format of the Cookie header in that it does not
		 * support the comma as a cookie delimiter (thus the header
		 * cannot be folded) because the Expires attribute described in
		 * the original Netscape's spec may contain an unquoted date
		 * with a comma inside. We have to live with this because
		 * many browsers don't support Max-Age and some browsers don't
		 * support quoted strings. However the Set-Cookie2 header is
		 * clean.
		 *
		 * We have to keep multiple pointers in order to support cookie
		 * removal at the beginning, middle or end of header without
		 * corrupting the header (in case of set-cookie2). A special
		 * pointer, <scav> points to the beginning of the set-cookie-av
		 * fields after the first semi-colon. The <next> pointer points
		 * either to the end of line (set-cookie) or next unquoted comma
		 * (set-cookie2). All of these headers are valid :
		 *
		 * Set-Cookie:    NAME1  =  VALUE 1  ; Secure; Path="/"\r\n
		 * Set-Cookie:NAME=VALUE; Secure; Expires=Thu, 01-Jan-1970 00:00:01 GMT\r\n
		 * Set-Cookie: NAME = VALUE ; Secure; Expires=Thu, 01-Jan-1970 00:00:01 GMT\r\n
		 * Set-Cookie2: NAME1 = VALUE 1 ; Max-Age=0, NAME2=VALUE2; Discard\r\n
		 * |          | |   | | |     | |          |                      |
		 * |          | |   | | |     | |          +-> next    hdr_end <--+
		 * |          | |   | | |     | +------------> scav
		 * |          | |   | | |     +--------------> val_end
		 * |          | |   | | +--------------------> val_beg
		 * |          | |   | +----------------------> equal
		 * |          | |   +------------------------> att_end
		 * |          | +----------------------------> att_beg
		 * |          +------------------------------> prev
		 * +-----------------------------------------> hdr_beg
		 */

		for (; prev < hdr_end; prev = next) {
			/* Iterate through all cookies on this line */

			/* find att_beg */
			att_beg = prev + 1;
			while (att_beg < hdr_end && http_is_spht[(unsigned char)*att_beg])
				att_beg++;

			/* find att_end : this is the first character after the last non
			 * space before the equal. It may be equal to hdr_end.
			 */
			equal = att_end = att_beg;

			while (equal < hdr_end) {
				if (*equal == '=' || *equal == ';' || (is_cookie2 && *equal == ','))
					break;
				if (http_is_spht[(unsigned char)*equal++])
					continue;
				att_end = equal;
			}

			/* here, <equal> points to '=', a delimitor or the end. <att_end>
			 * is between <att_beg> and <equal>, both may be identical.
			 */

			/* look for end of cookie if there is an equal sign */
			if (equal < hdr_end && *equal == '=') {
				/* look for the beginning of the value */
				val_beg = equal + 1;
				while (val_beg < hdr_end && http_is_spht[(unsigned char)*val_beg])
					val_beg++;

				/* find the end of the value, respecting quotes */
				next = find_cookie_value_end(val_beg, hdr_end);

				/* make val_end point to the first white space or delimitor after the value */
				val_end = next;
				while (val_end > val_beg && http_is_spht[(unsigned char)*(val_end - 1)])
					val_end--;
			} else {
				/* <equal> points to next comma, semi-colon or EOL */
				val_beg = val_end = next = equal;
			}

			if (next < hdr_end) {
				/* Set-Cookie2 supports multiple cookies, and <next> points to
				 * a colon or semi-colon before the end. So skip all attr-value
				 * pairs and look for the next comma. For Set-Cookie, since
				 * commas are permitted in values, skip to the end.
				 */
				if (is_cookie2)
					next = find_hdr_value_end(next, hdr_end);
				else
					next = hdr_end;
			}

			/* Now everything is as on the diagram above */

			/* Ignore cookies with no equal sign */
			if (equal == val_end)
				continue;

			/* If there are spaces around the equal sign, we need to
			 * strip them otherwise we'll get trouble for cookie captures,
			 * or even for rewrites. Since this happens extremely rarely,
			 * it does not hurt performance.
			 */
			if (unlikely(att_end != equal || val_beg > equal + 1)) {
				int stripped_before = 0;
				int stripped_after = 0;

				if (att_end != equal) {
					stripped_before = buffer_replace2(res, att_end, equal, NULL, 0);
					equal   += stripped_before;
					val_beg += stripped_before;
				}

				if (val_beg > equal + 1) {
					stripped_after = buffer_replace2(res, equal + 1, val_beg, NULL, 0);
					val_beg += stripped_after;
					stripped_before += stripped_after;
				}

				val_end      += stripped_before;
				next         += stripped_before;
				hdr_end      += stripped_before;
				hdr_next     += stripped_before;
				cur_hdr->len += stripped_before;
				http_msg_move_end(&txn->req, stripped_before);
			}

			/* First, let's see if we want to capture this cookie. We check
			 * that we don't already have a server side cookie, because we
			 * can only capture one. Also as an optimisation, we ignore
			 * cookies shorter than the declared name.
			 */
			if (t->fe->capture_name != NULL &&
			    txn->srv_cookie == NULL &&
			    (val_end - att_beg >= t->fe->capture_namelen) &&
			    memcmp(att_beg, t->fe->capture_name, t->fe->capture_namelen) == 0) {
				int log_len = val_end - att_beg;
				if ((txn->srv_cookie = pool_alloc2(pool2_capture)) == NULL) {
					Alert("HTTP logging : out of memory.\n");
				}
				else {
					if (log_len > t->fe->capture_len)
						log_len = t->fe->capture_len;
					memcpy(txn->srv_cookie, att_beg, log_len);
					txn->srv_cookie[log_len] = 0;
				}
			}

			/* now check if we need to process it for persistence */
			if (!(t->flags & SN_IGNORE_PRST) &&
			    (att_end - att_beg == t->be->cookie_len) && (t->be->cookie_name != NULL) &&
			    (memcmp(att_beg, t->be->cookie_name, att_end - att_beg) == 0)) {
				/* assume passive cookie by default */
				txn->flags &= ~TX_SCK_MASK;
				txn->flags |= TX_SCK_FOUND;
			
				/* If the cookie is in insert mode on a known server, we'll delete
				 * this occurrence because we'll insert another one later.
				 * We'll delete it too if the "indirect" option is set and we're in
				 * a direct access.
				 */
				if (t->be->options2 & PR_O2_COOK_PSV) {
					/* The "preserve" flag was set, we don't want to touch the
					 * server's cookie.
					 */
				}
				else if (((t->srv) && (t->be->options & PR_O_COOK_INS)) ||
				    ((t->flags & SN_DIRECT) && (t->be->options & PR_O_COOK_IND))) {
					/* this cookie must be deleted */
					if (*prev == ':' && next == hdr_end) {
						/* whole header */
						delta = buffer_replace2(res, hdr_beg, hdr_next, NULL, 0);
						txn->hdr_idx.v[old_idx].next = cur_hdr->next;
						txn->hdr_idx.used--;
						cur_hdr->len = 0;
						cur_idx = old_idx;
						hdr_next += delta;
						http_msg_move_end(&txn->rsp, delta);
						/* note: while both invalid now, <next> and <hdr_end>
						 * are still equal, so the for() will stop as expected.
						 */
					} else {
						/* just remove the value */
						int delta = del_hdr_value(res, &prev, next);
						next      = prev;
						hdr_end  += delta;
						hdr_next += delta;
						cur_hdr->len += delta;
						http_msg_move_end(&txn->rsp, delta);
					}
					txn->flags &= ~TX_SCK_MASK;
					txn->flags |= TX_SCK_DELETED;
					/* and go on with next cookie */
				}
				else if ((t->srv) && (t->srv->cookie) &&
					 (t->be->options & PR_O_COOK_RW)) {
					/* replace bytes val_beg->val_end with the cookie name associated
					 * with this server since we know it.
					 */
					delta = buffer_replace2(res, val_beg, val_end, t->srv->cookie, t->srv->cklen);
					next     += delta;
					hdr_end  += delta;
					hdr_next += delta;
					cur_hdr->len += delta;
					http_msg_move_end(&txn->rsp, delta);

					txn->flags &= ~TX_SCK_MASK;
					txn->flags |= TX_SCK_REPLACED;
				}
				else if ((t->srv) && (t->srv->cookie) &&
					 (t->be->options & PR_O_COOK_PFX)) {
					/* insert the cookie name associated with this server
					 * before existing cookie, and insert a delimiter between them..
					 */
					delta = buffer_replace2(res, val_beg, val_beg, t->srv->cookie, t->srv->cklen + 1);
					next     += delta;
					hdr_end  += delta;
					hdr_next += delta;
					cur_hdr->len += delta;
					http_msg_move_end(&txn->rsp, delta);

					val_beg[t->srv->cklen] = COOKIE_DELIM;
					txn->flags &= ~TX_SCK_MASK;
					txn->flags |= TX_SCK_REPLACED;
				}
			}
			/* next, let's see if the cookie is our appcookie, unless persistence must be ignored */
			else if (!(t->flags & SN_IGNORE_PRST) && (t->be->appsession_name != NULL)) {
				int cmp_len, value_len;
				char *value_begin;

				if (t->be->options2 & PR_O2_AS_PFX) {
					cmp_len = MIN(val_end - att_beg, t->be->appsession_name_len);
					value_begin = att_beg + t->be->appsession_name_len;
					value_len = MIN(t->be->appsession_len, val_end - att_beg - t->be->appsession_name_len);
				} else {
					cmp_len = att_end - att_beg;
					value_begin = val_beg;
					value_len = MIN(t->be->appsession_len, val_end - val_beg);
				}

				if ((cmp_len == t->be->appsession_name_len) &&
				    (memcmp(att_beg, t->be->appsession_name, t->be->appsession_name_len) == 0)) {
					/* free a possibly previously allocated memory */
					pool_free2(apools.sessid, txn->sessid);

					/* Store the sessid in the session for future use */
					if ((txn->sessid = pool_alloc2(apools.sessid)) == NULL) {
						Alert("Not enough Memory process_srv():asession->sessid:malloc().\n");
						send_log(t->be, LOG_ALERT, "Not enough Memory process_srv():asession->sessid:malloc().\n");
						return;
					}
					memcpy(txn->sessid, value_begin, value_len);
					txn->sessid[value_len] = 0;
				}
			}
			/* that's done for this cookie, check the next one on the same
			 * line when next != hdr_end (only if is_cookie2).
			 */
		}
		/* check next header */
		old_idx = cur_idx;
	}

	if (txn->sessid != NULL) {
		appsess *asession = NULL;
		/* only do insert, if lookup fails */
		asession = appsession_hash_lookup(&(t->be->htbl_proxy), txn->sessid);
		if (asession == NULL) {
			size_t server_id_len;
			if ((asession = pool_alloc2(pool2_appsess)) == NULL) {
				Alert("Not enough Memory process_srv():asession:calloc().\n");
				send_log(t->be, LOG_ALERT, "Not enough Memory process_srv():asession:calloc().\n");
				return;
			}
			asession->serverid = NULL; /* to avoid a double free in case of allocation error */

			if ((asession->sessid = pool_alloc2(apools.sessid)) == NULL) {
				Alert("Not enough Memory process_srv():asession->sessid:malloc().\n");
				send_log(t->be, LOG_ALERT, "Not enough Memory process_srv():asession->sessid:malloc().\n");
				t->be->htbl_proxy.destroy(asession);
				return;
			}
			memcpy(asession->sessid, txn->sessid, t->be->appsession_len);
			asession->sessid[t->be->appsession_len] = 0;

			server_id_len = strlen(t->srv->id) + 1;
			if ((asession->serverid = pool_alloc2(apools.serverid)) == NULL) {
				Alert("Not enough Memory process_srv():asession->serverid:malloc().\n");
				send_log(t->be, LOG_ALERT, "Not enough Memory process_srv():asession->sessid:malloc().\n");
				t->be->htbl_proxy.destroy(asession);
				return;
			}
			asession->serverid[0] = '\0';
			memcpy(asession->serverid, t->srv->id, server_id_len);

			asession->request_count = 0;
			appsession_hash_insert(&(t->be->htbl_proxy), asession);
		}

		asession->expire = tick_add_ifset(now_ms, t->be->timeout.appsession);
		asession->request_count++;
	}
}


/*
 * Check if response is cacheable or not. Updates t->flags.
 */
void check_response_for_cacheability(struct session *t, struct buffer *rtr)
{
	struct http_txn *txn = &t->txn;
	char *p1, *p2;

	char *cur_ptr, *cur_end, *cur_next;
	int cur_idx;

	if (!(txn->flags & TX_CACHEABLE))
		return;

	/* Iterate through the headers.
	 * we start with the start line.
	 */
	cur_idx = 0;
	cur_next = txn->rsp.sol + hdr_idx_first_pos(&txn->hdr_idx);

	while ((cur_idx = txn->hdr_idx.v[cur_idx].next)) {
		struct hdr_idx_elem *cur_hdr;
		int val;

		cur_hdr  = &txn->hdr_idx.v[cur_idx];
		cur_ptr  = cur_next;
		cur_end  = cur_ptr + cur_hdr->len;
		cur_next = cur_end + cur_hdr->cr + 1;

		/* We have one full header between cur_ptr and cur_end, and the
		 * next header starts at cur_next. We're only interested in
		 * "Cookie:" headers.
		 */

		val = http_header_match2(cur_ptr, cur_end, "Pragma", 6);
		if (val) {
			if ((cur_end - (cur_ptr + val) >= 8) &&
			    strncasecmp(cur_ptr + val, "no-cache", 8) == 0) {
				txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
				return;
			}
		}

		val = http_header_match2(cur_ptr, cur_end, "Cache-control", 13);
		if (!val)
			continue;

		/* OK, right now we know we have a cache-control header at cur_ptr */

		p1 = cur_ptr + val; /* first non-space char after 'cache-control:' */

		if (p1 >= cur_end)	/* no more info */
			continue;

		/* p1 is at the beginning of the value */
		p2 = p1;

		while (p2 < cur_end && *p2 != '=' && *p2 != ',' && !isspace((unsigned char)*p2))
			p2++;

		/* we have a complete value between p1 and p2 */
		if (p2 < cur_end && *p2 == '=') {
			/* we have something of the form no-cache="set-cookie" */
			if ((cur_end - p1 >= 21) &&
			    strncasecmp(p1, "no-cache=\"set-cookie", 20) == 0
			    && (p1[20] == '"' || p1[20] == ','))
				txn->flags &= ~TX_CACHE_COOK;
			continue;
		}

		/* OK, so we know that either p2 points to the end of string or to a comma */
		if (((p2 - p1 ==  7) && strncasecmp(p1, "private", 7) == 0) ||
		    ((p2 - p1 ==  8) && strncasecmp(p1, "no-store", 8) == 0) ||
		    ((p2 - p1 ==  9) && strncasecmp(p1, "max-age=0", 9) == 0) ||
		    ((p2 - p1 == 10) && strncasecmp(p1, "s-maxage=0", 10) == 0)) {
			txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
			return;
		}

		if ((p2 - p1 ==  6) && strncasecmp(p1, "public", 6) == 0) {
			txn->flags |= TX_CACHEABLE | TX_CACHE_COOK;
			continue;
		}
	}
}


/*
 * Try to retrieve a known appsession in the URI, then the associated server.
 * If the server is found, it's assigned to the session.
 */
void get_srv_from_appsession(struct session *t, const char *begin, int len)
{
	char *end_params, *first_param, *cur_param, *next_param;
	char separator;
	int value_len;

	int mode = t->be->options2 & PR_O2_AS_M_ANY;

	if (t->be->appsession_name == NULL ||
	    (t->txn.meth != HTTP_METH_GET && t->txn.meth != HTTP_METH_POST && t->txn.meth != HTTP_METH_HEAD)) {
		return;
	}

	first_param = NULL;
	switch (mode) {
	case PR_O2_AS_M_PP:
		first_param = memchr(begin, ';', len);
		break;
	case PR_O2_AS_M_QS:
		first_param = memchr(begin, '?', len);
		break;
	}

	if (first_param == NULL) {
		return;
	}

	switch (mode) {
	case PR_O2_AS_M_PP:
		if ((end_params = memchr(first_param, '?', len - (begin - first_param))) == NULL) {
			end_params = (char *) begin + len;
		}
		separator = ';';
		break;
	case PR_O2_AS_M_QS:
		end_params = (char *) begin + len;
		separator = '&';
		break;
	default:
		/* unknown mode, shouldn't happen */
		return;
	}
	
	cur_param = next_param = end_params;
	while (cur_param > first_param) {
		cur_param--;
		if ((cur_param[0] == separator) || (cur_param == first_param)) {
			/* let's see if this is the appsession parameter */
			if ((cur_param + t->be->appsession_name_len + 1 < next_param) &&
				((t->be->options2 & PR_O2_AS_PFX) || cur_param[t->be->appsession_name_len + 1] == '=') &&
				(strncasecmp(cur_param + 1, t->be->appsession_name, t->be->appsession_name_len) == 0)) {
				/* Cool... it's the right one */
				cur_param += t->be->appsession_name_len + (t->be->options2 & PR_O2_AS_PFX ? 1 : 2);
				value_len = MIN(t->be->appsession_len, next_param - cur_param);
				if (value_len > 0) {
					manage_client_side_appsession(t, cur_param, value_len);
				}
				break;
			}
			next_param = cur_param;
		}
	}
#if defined(DEBUG_HASH)
	Alert("get_srv_from_appsession\n");
	appsession_hash_dump(&(t->be->htbl_proxy));
#endif
}

/*
 * In a GET, HEAD or POST request, check if the requested URI matches the stats uri
 * for the current backend.
 *
 * It is assumed that the request is either a HEAD, GET, or POST and that the
 * t->be->uri_auth field is valid.
 *
 * Returns 1 if stats should be provided, otherwise 0.
 */
int stats_check_uri(struct session *t, struct proxy *backend)
{
	struct http_txn *txn = &t->txn;
	struct uri_auth *uri_auth = backend->uri_auth;
	char *h;

	if (!uri_auth)
		return 0;

	if (txn->meth != HTTP_METH_GET && txn->meth != HTTP_METH_HEAD && txn->meth != HTTP_METH_POST)
		return 0;

	memset(&t->data_ctx.stats, 0, sizeof(t->data_ctx.stats));

	/* check URI size */
	if (uri_auth->uri_len > txn->req.sl.rq.u_l)
		return 0;

	h = txn->req.sol + txn->req.sl.rq.u;

	/* the URI is in h */
	if (memcmp(h, uri_auth->uri_prefix, uri_auth->uri_len) != 0)
		return 0;

	h += uri_auth->uri_len;
	while (h <= txn->req.sol + txn->req.sl.rq.u + txn->req.sl.rq.u_l - 3) {
		if (memcmp(h, ";up", 3) == 0) {
			t->data_ctx.stats.flags |= STAT_HIDE_DOWN;
			break;
		}
		h++;
	}

	if (uri_auth->refresh) {
		h = txn->req.sol + txn->req.sl.rq.u + uri_auth->uri_len;
		while (h <= txn->req.sol + txn->req.sl.rq.u + txn->req.sl.rq.u_l - 10) {
			if (memcmp(h, ";norefresh", 10) == 0) {
				t->data_ctx.stats.flags |= STAT_NO_REFRESH;
				break;
			}
			h++;
		}
	}

	h = txn->req.sol + txn->req.sl.rq.u + uri_auth->uri_len;
	while (h <= txn->req.sol + txn->req.sl.rq.u + txn->req.sl.rq.u_l - 4) {
		if (memcmp(h, ";csv", 4) == 0) {
			t->data_ctx.stats.flags |= STAT_FMT_CSV;
			break;
		}
		h++;
	}

	h = txn->req.sol + txn->req.sl.rq.u + uri_auth->uri_len;
	while (h <= txn->req.sol + txn->req.sl.rq.u + txn->req.sl.rq.u_l - 8) {
		if (memcmp(h, ";st=", 4) == 0) {
			h += 4;

			if (memcmp(h, STAT_STATUS_DONE, 4) == 0)
				t->data_ctx.stats.st_code = STAT_STATUS_DONE;
			else if (memcmp(h, STAT_STATUS_NONE, 4) == 0)
				t->data_ctx.stats.st_code = STAT_STATUS_NONE;
			else if (memcmp(h, STAT_STATUS_EXCD, 4) == 0)
				t->data_ctx.stats.st_code = STAT_STATUS_EXCD;
			else if (memcmp(h, STAT_STATUS_DENY, 4) == 0)
				t->data_ctx.stats.st_code = STAT_STATUS_DENY;
			else
				t->data_ctx.stats.st_code = STAT_STATUS_UNKN;
			break;
		}
		h++;
	}

	t->data_ctx.stats.flags |= STAT_SHOW_STAT | STAT_SHOW_INFO;

	return 1;
}

/*
 * Capture a bad request or response and archive it in the proxy's structure.
 * WARNING: it's unlikely that we've reached HTTP_MSG_BODY here so we must not
 * assume that msg->sol = buf->data + msg->som.
 */
void http_capture_bad_message(struct error_snapshot *es, struct session *s,
                              struct buffer *buf, struct http_msg *msg,
			      int state, struct proxy *other_end)
{
	if (buf->r <= (buf->data + msg->som)) { /* message wraps */
		int len1 = buf->size - msg->som;
		es->len = buf->r - (buf->data + msg->som) + buf->size;
		memcpy(es->buf, buf->data + msg->som, MIN(len1, sizeof(es->buf)));
		if (es->len > len1 && len1 < sizeof(es->buf))
			memcpy(es->buf, buf->data, MIN(es->len, sizeof(es->buf)) - len1);
	}
	else {
		es->len = buf->r - (buf->data + msg->som);
		memcpy(es->buf, buf->data + msg->som, MIN(es->len, sizeof(es->buf)));
	}

	if (msg->err_pos >= 0)
		es->pos  = msg->err_pos - msg->som;
	else if (buf->lr >= (buf->data + msg->som))
		es->pos  = buf->lr - (buf->data + msg->som);
	else
		es->pos  = buf->lr - (buf->data + msg->som) + buf->size;

	es->when = date; // user-visible date
	es->sid  = s->uniq_id;
	es->srv  = s->srv;
	es->oe   = other_end;
	es->src  = s->cli_addr;
	es->state = state;
	es->flags = buf->flags;
	es->ev_id = error_snapshot_id++;
}

/* return the IP address pointed to by occurrence <occ> of header <hname> in
 * HTTP message <msg> indexed in <idx>. If <occ> is strictly positive, the
 * occurrence number corresponding to this value is returned. If <occ> is
 * strictly negative, the occurrence number before the end corresponding to
 * this value is returned. If <occ> is null, any value is returned, so it is
 * not recommended to use it that way. Negative occurrences are limited to
 * a small value because it is required to keep them in memory while scanning.
 * IP address 0.0.0.0 is returned if no match is found.
 */
unsigned int get_ip_from_hdr2(struct http_msg *msg, const char *hname, int hlen, struct hdr_idx *idx, int occ)
{
	struct hdr_ctx ctx;
	unsigned int hdr_hist[MAX_HDR_HISTORY];
	unsigned int hist_ptr;
	int found = 0;

	ctx.idx = 0;
	if (occ >= 0) {
		while (http_find_header2(hname, hlen, msg->sol, idx, &ctx)) {
			occ--;
			if (occ <= 0) {
				found = 1;
				break;
			}
		}
		if (!found)
			return 0;
		return inetaddr_host_lim(ctx.line+ctx.val, ctx.line+ctx.val+ctx.vlen);
	}

	/* negative occurrence, we scan all the list then walk back */
	if (-occ > MAX_HDR_HISTORY)
		return 0;

	hist_ptr = 0;
	hdr_hist[hist_ptr] = 0;
	while (http_find_header2(hname, hlen, msg->sol, idx, &ctx)) {
		hdr_hist[hist_ptr++] = inetaddr_host_lim(ctx.line+ctx.val, ctx.line+ctx.val+ctx.vlen);
		if (hist_ptr >= MAX_HDR_HISTORY)
			hist_ptr = 0;
		found++;
	}
	if (-occ > found)
		return 0;
	/* OK now we have the last occurrence in [hist_ptr-1], and we need to
	 * find occurrence -occ, so we have to check [hist_ptr+occ].
	 */
	hist_ptr += occ;
	if (hist_ptr >= MAX_HDR_HISTORY)
		hist_ptr -= MAX_HDR_HISTORY;
	return hdr_hist[hist_ptr];
}

/*
 * Print a debug line with a header
 */
void debug_hdr(const char *dir, struct session *t, const char *start, const char *end)
{
	int len, max;
	len = sprintf(trash, "%08x:%s.%s[%04x:%04x]: ", t->uniq_id, t->be->id,
		      dir, (unsigned  short)t->req->prod->fd, (unsigned short)t->req->cons->fd);
	max = end - start;
	UBOUND(max, sizeof(trash) - len - 1);
	len += strlcpy2(trash + len, start, max + 1);
	trash[len++] = '\n';
	write(1, trash, len);
}

/*
 * Initialize a new HTTP transaction for session <s>. It is assumed that all
 * the required fields are properly allocated and that we only need to (re)init
 * them. This should be used before processing any new request.
 */
void http_init_txn(struct session *s)
{
	struct http_txn *txn = &s->txn;
	struct proxy *fe = s->fe;

	txn->flags = 0;
	txn->status = -1;

	txn->cookie_first_date = 0;
	txn->cookie_last_date = 0;

	txn->req.sol = txn->req.eol = NULL;
	txn->req.som = txn->req.eoh = 0; /* relative to the buffer */
	txn->rsp.sol = txn->rsp.eol = NULL;
	txn->rsp.som = txn->rsp.eoh = 0; /* relative to the buffer */
	txn->req.hdr_content_len = 0LL;
	txn->rsp.hdr_content_len = 0LL;
	txn->req.msg_state = HTTP_MSG_RQBEFORE; /* at the very beginning of the request */
	txn->rsp.msg_state = HTTP_MSG_RPBEFORE; /* at the very beginning of the response */

	txn->auth.method = HTTP_AUTH_UNKNOWN;

	txn->req.err_pos = txn->rsp.err_pos = -2; /* block buggy requests/responses */
	if (fe->options2 & PR_O2_REQBUG_OK)
		txn->req.err_pos = -1;            /* let buggy requests pass */

	if (txn->req.cap)
		memset(txn->req.cap, 0, fe->nb_req_cap * sizeof(void *));

	if (txn->rsp.cap)
		memset(txn->rsp.cap, 0, fe->nb_rsp_cap * sizeof(void *));

	if (txn->hdr_idx.v)
		hdr_idx_init(&txn->hdr_idx);
}

/* to be used at the end of a transaction */
void http_end_txn(struct session *s)
{
	struct http_txn *txn = &s->txn;

	/* these ones will have been dynamically allocated */
	pool_free2(pool2_requri, txn->uri);
	pool_free2(pool2_capture, txn->cli_cookie);
	pool_free2(pool2_capture, txn->srv_cookie);
	pool_free2(apools.sessid, txn->sessid);

	txn->sessid = NULL;
	txn->uri = NULL;
	txn->srv_cookie = NULL;
	txn->cli_cookie = NULL;

	if (txn->req.cap) {
		struct cap_hdr *h;
		for (h = s->fe->req_cap; h; h = h->next)
			pool_free2(h->pool, txn->req.cap[h->index]);
		memset(txn->req.cap, 0, s->fe->nb_req_cap * sizeof(void *));
	}

	if (txn->rsp.cap) {
		struct cap_hdr *h;
		for (h = s->fe->rsp_cap; h; h = h->next)
			pool_free2(h->pool, txn->rsp.cap[h->index]);
		memset(txn->rsp.cap, 0, s->fe->nb_rsp_cap * sizeof(void *));
	}

}

/* to be used at the end of a transaction to prepare a new one */
void http_reset_txn(struct session *s)
{
	http_end_txn(s);
	http_init_txn(s);

	s->be = s->fe;
	s->logs.logwait = s->fe->to_log;
	s->srv = s->prev_srv = s->srv_conn = NULL;
	/* re-init store persistence */
	s->store_count = 0;

	s->pend_pos = NULL;

	s->req->flags |= BF_READ_DONTWAIT; /* one read is usually enough */

	/* We must trim any excess data from the response buffer, because we
	 * may have blocked an invalid response from a server that we don't
	 * want to accidentely forward once we disable the analysers, nor do
	 * we want those data to come along with next response. A typical
	 * example of such data would be from a buggy server responding to
	 * a HEAD with some data, or sending more than the advertised
	 * content-length.
	 */
	if (unlikely(s->rep->l > s->rep->send_max)) {
		s->rep->l = s->rep->send_max;
		s->rep->r = s->rep->w + s->rep->l;
		if (s->rep->r >= s->rep->data + s->rep->size)
			s->rep->r -= s->rep->size;
	}

	s->req->rto = s->fe->timeout.client;
	s->req->wto = TICK_ETERNITY;

	s->rep->rto = TICK_ETERNITY;
	s->rep->wto = s->fe->timeout.client;

	s->req->rex = TICK_ETERNITY;
	s->req->wex = TICK_ETERNITY;
	s->req->analyse_exp = TICK_ETERNITY;
	s->rep->rex = TICK_ETERNITY;
	s->rep->wex = TICK_ETERNITY;
	s->rep->analyse_exp = TICK_ETERNITY;
}

/************************************************************************/
/*        The code below is dedicated to ACL parsing and matching       */
/************************************************************************/


/* 1. Check on METHOD
 * We use the pre-parsed method if it is known, and store its number as an
 * integer. If it is unknown, we use the pointer and the length.
 */
static int acl_parse_meth(const char **text, struct acl_pattern *pattern, int *opaque)
{
	int len, meth;

	len  = strlen(*text);
	meth = find_http_meth(*text, len);

	pattern->val.i = meth;
	if (meth == HTTP_METH_OTHER) {
		pattern->ptr.str = strdup(*text);
		if (!pattern->ptr.str)
			return 0;
		pattern->len = len;
	}
	return 1;
}

static int
acl_fetch_meth(struct proxy *px, struct session *l4, void *l7, int dir,
               struct acl_expr *expr, struct acl_test *test)
{
	int meth;
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->req.msg_state < HTTP_MSG_BODY)
		return 0;

	meth = txn->meth;
	test->i = meth;
	if (meth == HTTP_METH_OTHER) {
		if (txn->rsp.msg_state != HTTP_MSG_RPBEFORE)
			/* ensure the indexes are not affected */
			return 0;
		test->len = txn->req.sl.rq.m_l;
		test->ptr = txn->req.sol;
	}
	test->flags = ACL_TEST_F_READ_ONLY | ACL_TEST_F_VOL_1ST;
	return 1;
}

static int acl_match_meth(struct acl_test *test, struct acl_pattern *pattern)
{
	int icase;

	if (test->i != pattern->val.i)
		return ACL_PAT_FAIL;

	if (test->i != HTTP_METH_OTHER)
		return ACL_PAT_PASS;

	/* Other method, we must compare the strings */
	if (pattern->len != test->len)
		return ACL_PAT_FAIL;

	icase = pattern->flags & ACL_PAT_F_IGNORE_CASE;
	if ((icase && strncasecmp(pattern->ptr.str, test->ptr, test->len) != 0) ||
	    (!icase && strncmp(pattern->ptr.str, test->ptr, test->len) != 0))
		return ACL_PAT_FAIL;
	return ACL_PAT_PASS;
}

/* 2. Check on Request/Status Version
 * We simply compare strings here.
 */
static int acl_parse_ver(const char **text, struct acl_pattern *pattern, int *opaque)
{
	pattern->ptr.str = strdup(*text);
	if (!pattern->ptr.str)
		return 0;
	pattern->len = strlen(*text);
	return 1;
}

static int
acl_fetch_rqver(struct proxy *px, struct session *l4, void *l7, int dir,
                struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;
	char *ptr;
	int len;

	if (!txn)
		return 0;

	if (txn->req.msg_state < HTTP_MSG_BODY)
		return 0;

	len = txn->req.sl.rq.v_l;
	ptr = txn->req.sol + txn->req.sl.rq.v;

	while ((len-- > 0) && (*ptr++ != '/'));
	if (len <= 0)
		return 0;

	test->ptr = ptr;
	test->len = len;

	test->flags = ACL_TEST_F_READ_ONLY | ACL_TEST_F_VOL_1ST;
	return 1;
}

static int
acl_fetch_stver(struct proxy *px, struct session *l4, void *l7, int dir,
                struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;
	char *ptr;
	int len;

	if (!txn)
		return 0;

	if (txn->rsp.msg_state < HTTP_MSG_BODY)
		return 0;

	len = txn->rsp.sl.st.v_l;
	ptr = txn->rsp.sol;

	while ((len-- > 0) && (*ptr++ != '/'));
	if (len <= 0)
		return 0;

	test->ptr = ptr;
	test->len = len;

	test->flags = ACL_TEST_F_READ_ONLY | ACL_TEST_F_VOL_1ST;
	return 1;
}

/* 3. Check on Status Code. We manipulate integers here. */
static int
acl_fetch_stcode(struct proxy *px, struct session *l4, void *l7, int dir,
                 struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;
	char *ptr;
	int len;

	if (!txn)
		return 0;

	if (txn->rsp.msg_state < HTTP_MSG_BODY)
		return 0;

	len = txn->rsp.sl.st.c_l;
	ptr = txn->rsp.sol + txn->rsp.sl.st.c;

	test->i = __strl2ui(ptr, len);
	test->flags = ACL_TEST_F_VOL_1ST;
	return 1;
}

/* 4. Check on URL/URI. A pointer to the URI is stored. */
static int
acl_fetch_url(struct proxy *px, struct session *l4, void *l7, int dir,
              struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->req.msg_state < HTTP_MSG_BODY)
		return 0;

	if (txn->rsp.msg_state != HTTP_MSG_RPBEFORE)
		/* ensure the indexes are not affected */
		return 0;

	test->len = txn->req.sl.rq.u_l;
	test->ptr = txn->req.sol + txn->req.sl.rq.u;

	/* we do not need to set READ_ONLY because the data is in a buffer */
	test->flags = ACL_TEST_F_VOL_1ST;
	return 1;
}

static int
acl_fetch_url_ip(struct proxy *px, struct session *l4, void *l7, int dir,
		 struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->req.msg_state < HTTP_MSG_BODY)
		return 0;

	if (txn->rsp.msg_state != HTTP_MSG_RPBEFORE)
		/* ensure the indexes are not affected */
		return 0;

	/* Parse HTTP request */
	url2sa(txn->req.sol + txn->req.sl.rq.u, txn->req.sl.rq.u_l, &l4->srv_addr);
	test->ptr = (void *)&((struct sockaddr_in *)&l4->srv_addr)->sin_addr;
	test->i = AF_INET;

	/*
	 * If we are parsing url in frontend space, we prepare backend stage
	 * to not parse again the same url ! optimization lazyness...
	 */
	if (px->options & PR_O_HTTP_PROXY)
		l4->flags |= SN_ADDR_SET;

	test->flags = ACL_TEST_F_READ_ONLY;
	return 1;
}

static int
acl_fetch_url_port(struct proxy *px, struct session *l4, void *l7, int dir,
		   struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->req.msg_state < HTTP_MSG_BODY)
		return 0;

	if (txn->rsp.msg_state != HTTP_MSG_RPBEFORE)
		/* ensure the indexes are not affected */
		return 0;

	/* Same optimization as url_ip */
	url2sa(txn->req.sol + txn->req.sl.rq.u, txn->req.sl.rq.u_l, &l4->srv_addr);
	test->i = ntohs(((struct sockaddr_in *)&l4->srv_addr)->sin_port);

	if (px->options & PR_O_HTTP_PROXY)
		l4->flags |= SN_ADDR_SET;

	test->flags = ACL_TEST_F_READ_ONLY;
	return 1;
}

/* 5. Check on HTTP header. A pointer to the beginning of the value is returned.
 * This generic function is used by both acl_fetch_chdr() and acl_fetch_shdr().
 */
static int
acl_fetch_hdr(struct proxy *px, struct session *l4, void *l7, char *sol,
              struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;
	struct hdr_idx *idx = &txn->hdr_idx;
	struct hdr_ctx *ctx = (struct hdr_ctx *)test->ctx.a;

	if (!txn)
		return 0;

	if (!(test->flags & ACL_TEST_F_FETCH_MORE))
		/* search for header from the beginning */
		ctx->idx = 0;

	if (http_find_header2(expr->arg.str, expr->arg_len, sol, idx, ctx)) {
		test->flags |= ACL_TEST_F_FETCH_MORE;
		test->flags |= ACL_TEST_F_VOL_HDR;
		test->len = ctx->vlen;
		test->ptr = (char *)ctx->line + ctx->val;
		return 1;
	}

	test->flags &= ~ACL_TEST_F_FETCH_MORE;
	test->flags |= ACL_TEST_F_VOL_HDR;
	return 0;
}

static int
acl_fetch_chdr(struct proxy *px, struct session *l4, void *l7, int dir,
	       struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->req.msg_state < HTTP_MSG_BODY)
		return 0;

	if (txn->rsp.msg_state != HTTP_MSG_RPBEFORE)
		/* ensure the indexes are not affected */
		return 0;

	return acl_fetch_hdr(px, l4, txn, txn->req.sol, expr, test);
}

static int
acl_fetch_shdr(struct proxy *px, struct session *l4, void *l7, int dir,
	       struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->rsp.msg_state < HTTP_MSG_BODY)
		return 0;

	return acl_fetch_hdr(px, l4, txn, txn->rsp.sol, expr, test);
}

/* 6. Check on HTTP header count. The number of occurrences is returned.
 * This generic function is used by both acl_fetch_chdr* and acl_fetch_shdr*.
 */
static int
acl_fetch_hdr_cnt(struct proxy *px, struct session *l4, void *l7, char *sol,
                  struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;
	struct hdr_idx *idx = &txn->hdr_idx;
	struct hdr_ctx ctx;
	int cnt;

	if (!txn)
		return 0;

	ctx.idx = 0;
	cnt = 0;
	while (http_find_header2(expr->arg.str, expr->arg_len, sol, idx, &ctx))
		cnt++;

	test->i = cnt;
	test->flags = ACL_TEST_F_VOL_HDR;
	return 1;
}

static int
acl_fetch_chdr_cnt(struct proxy *px, struct session *l4, void *l7, int dir,
		   struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->req.msg_state < HTTP_MSG_BODY)
		return 0;

	if (txn->rsp.msg_state != HTTP_MSG_RPBEFORE)
		/* ensure the indexes are not affected */
		return 0;

	return acl_fetch_hdr_cnt(px, l4, txn, txn->req.sol, expr, test);
}

static int
acl_fetch_shdr_cnt(struct proxy *px, struct session *l4, void *l7, int dir,
		   struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->rsp.msg_state < HTTP_MSG_BODY)
		return 0;

	return acl_fetch_hdr_cnt(px, l4, txn, txn->rsp.sol, expr, test);
}

/* 7. Check on HTTP header's integer value. The integer value is returned.
 * FIXME: the type is 'int', it may not be appropriate for everything.
 * This generic function is used by both acl_fetch_chdr* and acl_fetch_shdr*.
 */
static int
acl_fetch_hdr_val(struct proxy *px, struct session *l4, void *l7, char *sol,
                  struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;
	struct hdr_idx *idx = &txn->hdr_idx;
	struct hdr_ctx *ctx = (struct hdr_ctx *)test->ctx.a;

	if (!txn)
		return 0;

	if (!(test->flags & ACL_TEST_F_FETCH_MORE))
		/* search for header from the beginning */
		ctx->idx = 0;

	if (http_find_header2(expr->arg.str, expr->arg_len, sol, idx, ctx)) {
		test->flags |= ACL_TEST_F_FETCH_MORE;
		test->flags |= ACL_TEST_F_VOL_HDR;
		test->i = strl2ic((char *)ctx->line + ctx->val, ctx->vlen);
		return 1;
	}

	test->flags &= ~ACL_TEST_F_FETCH_MORE;
	test->flags |= ACL_TEST_F_VOL_HDR;
	return 0;
}

static int
acl_fetch_chdr_val(struct proxy *px, struct session *l4, void *l7, int dir,
		   struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->req.msg_state < HTTP_MSG_BODY)
		return 0;

	if (txn->rsp.msg_state != HTTP_MSG_RPBEFORE)
		/* ensure the indexes are not affected */
		return 0;

	return acl_fetch_hdr_val(px, l4, txn, txn->req.sol, expr, test);
}

static int
acl_fetch_shdr_val(struct proxy *px, struct session *l4, void *l7, int dir,
		   struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->rsp.msg_state < HTTP_MSG_BODY)
		return 0;

	return acl_fetch_hdr_val(px, l4, txn, txn->rsp.sol, expr, test);
}

/* 7. Check on HTTP header's IPv4 address value. The IPv4 address is returned.
 * This generic function is used by both acl_fetch_chdr* and acl_fetch_shdr*.
 */
static int
acl_fetch_hdr_ip(struct proxy *px, struct session *l4, void *l7, char *sol,
                  struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;
	struct hdr_idx *idx = &txn->hdr_idx;
	struct hdr_ctx *ctx = (struct hdr_ctx *)test->ctx.a;

	if (!txn)
		return 0;

	if (!(test->flags & ACL_TEST_F_FETCH_MORE))
		/* search for header from the beginning */
		ctx->idx = 0;

	if (http_find_header2(expr->arg.str, expr->arg_len, sol, idx, ctx)) {
		test->flags |= ACL_TEST_F_FETCH_MORE;
		test->flags |= ACL_TEST_F_VOL_HDR;
		/* Same optimization as url_ip */
		memset(&l4->srv_addr.sin_addr, 0, sizeof(l4->srv_addr.sin_addr));
		url2ip((char *)ctx->line + ctx->val, &l4->srv_addr.sin_addr);
		test->ptr = (void *)&l4->srv_addr.sin_addr;
		test->i = AF_INET;
		return 1;
	}

	test->flags &= ~ACL_TEST_F_FETCH_MORE;
	test->flags |= ACL_TEST_F_VOL_HDR;
	return 0;
}

static int
acl_fetch_chdr_ip(struct proxy *px, struct session *l4, void *l7, int dir,
		   struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->req.msg_state < HTTP_MSG_BODY)
		return 0;

	if (txn->rsp.msg_state != HTTP_MSG_RPBEFORE)
		/* ensure the indexes are not affected */
		return 0;

	return acl_fetch_hdr_ip(px, l4, txn, txn->req.sol, expr, test);
}

static int
acl_fetch_shdr_ip(struct proxy *px, struct session *l4, void *l7, int dir,
		   struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;

	if (!txn)
		return 0;

	if (txn->rsp.msg_state < HTTP_MSG_BODY)
		return 0;

	return acl_fetch_hdr_ip(px, l4, txn, txn->rsp.sol, expr, test);
}

/* 8. Check on URI PATH. A pointer to the PATH is stored. The path starts at
 * the first '/' after the possible hostname, and ends before the possible '?'.
 */
static int
acl_fetch_path(struct proxy *px, struct session *l4, void *l7, int dir,
               struct acl_expr *expr, struct acl_test *test)
{
	struct http_txn *txn = l7;
	char *ptr, *end;

	if (!txn)
		return 0;

	if (txn->req.msg_state < HTTP_MSG_BODY)
		return 0;

	if (txn->rsp.msg_state != HTTP_MSG_RPBEFORE)
		/* ensure the indexes are not affected */
		return 0;

	end = txn->req.sol + txn->req.sl.rq.u + txn->req.sl.rq.u_l;
	ptr = http_get_path(txn);
	if (!ptr)
		return 0;

	/* OK, we got the '/' ! */
	test->ptr = ptr;

	while (ptr < end && *ptr != '?')
		ptr++;

	test->len = ptr - test->ptr;

	/* we do not need to set READ_ONLY because the data is in a buffer */
	test->flags = ACL_TEST_F_VOL_1ST;
	return 1;
}

static int
acl_fetch_proto_http(struct proxy *px, struct session *s, void *l7, int dir,
		     struct acl_expr *expr, struct acl_test *test)
{
	struct buffer *req = s->req;
	struct http_txn *txn = &s->txn;
	struct http_msg *msg = &txn->req;

	/* Note: hdr_idx.v cannot be NULL in this ACL because the ACL is tagged
	 * as a layer7 ACL, which involves automatic allocation of hdr_idx.
	 */

	if (!s || !req)
		return 0;

	if (unlikely(msg->msg_state >= HTTP_MSG_BODY)) {
		/* Already decoded as OK */
		test->flags |= ACL_TEST_F_SET_RES_PASS;
		return 1;
	}

	/* Try to decode HTTP request */
	if (likely(req->lr < req->r))
		http_msg_analyzer(req, msg, &txn->hdr_idx);

	if (unlikely(msg->msg_state < HTTP_MSG_BODY)) {
		if ((msg->msg_state == HTTP_MSG_ERROR) || (req->flags & BF_FULL)) {
			test->flags |= ACL_TEST_F_SET_RES_FAIL;
			return 1;
		}
		/* wait for final state */
		test->flags |= ACL_TEST_F_MAY_CHANGE;
		return 0;
	}

	/* OK we got a valid HTTP request. We have some minor preparation to
	 * perform so that further checks can rely on HTTP tests.
	 */
	txn->meth = find_http_meth(msg->sol, msg->sl.rq.m_l);
	if (txn->meth == HTTP_METH_GET || txn->meth == HTTP_METH_HEAD)
		s->flags |= SN_REDIRECTABLE;

	if (unlikely(msg->sl.rq.v_l == 0) && !http_upgrade_v09_to_v10(req, msg, txn)) {
		test->flags |= ACL_TEST_F_SET_RES_FAIL;
		return 1;
	}

	test->flags |= ACL_TEST_F_SET_RES_PASS;
	return 1;
}

/* return a valid test if the current request is the first one on the connection */
static int
acl_fetch_http_first_req(struct proxy *px, struct session *s, void *l7, int dir,
		     struct acl_expr *expr, struct acl_test *test)
{
	if (!s)
		return 0;

	if (s->txn.flags & TX_NOT_FIRST)
		test->flags |= ACL_TEST_F_SET_RES_FAIL;
	else
		test->flags |= ACL_TEST_F_SET_RES_PASS;

	return 1;
}

static int
acl_fetch_http_auth(struct proxy *px, struct session *s, void *l7, int dir,
		    struct acl_expr *expr, struct acl_test *test)
{

	if (!s)
		return 0;

	if (!get_http_auth(s))
		return 0;

	test->ctx.a[0] = expr->arg.ul;
	test->ctx.a[1] = s->txn.auth.user;
	test->ctx.a[2] = s->txn.auth.pass;

	test->flags |= ACL_TEST_F_READ_ONLY | ACL_TEST_F_NULL_MATCH;

	return 1;
}

/************************************************************************/
/*             All supported keywords must be declared here.            */
/************************************************************************/

/* Note: must not be declared <const> as its list will be overwritten */
static struct acl_kw_list acl_kws = {{ },{
	{ "req_proto_http", acl_parse_nothing, acl_fetch_proto_http, acl_match_nothing, ACL_USE_L7REQ_PERMANENT },

	{ "method",     acl_parse_meth,  acl_fetch_meth,   acl_match_meth, ACL_USE_L7REQ_PERMANENT },
	{ "req_ver",    acl_parse_ver,   acl_fetch_rqver,  acl_match_str,  ACL_USE_L7REQ_VOLATILE|ACL_MAY_LOOKUP },
	{ "resp_ver",   acl_parse_ver,   acl_fetch_stver,  acl_match_str,  ACL_USE_L7RTR_VOLATILE|ACL_MAY_LOOKUP },
	{ "status",     acl_parse_int,   acl_fetch_stcode, acl_match_int,  ACL_USE_L7RTR_PERMANENT },

	{ "url",        acl_parse_str,   acl_fetch_url,      acl_match_str,  ACL_USE_L7REQ_VOLATILE|ACL_MAY_LOOKUP },
	{ "url_beg",    acl_parse_str,   acl_fetch_url,      acl_match_beg,  ACL_USE_L7REQ_VOLATILE },
	{ "url_end",    acl_parse_str,   acl_fetch_url,      acl_match_end,  ACL_USE_L7REQ_VOLATILE },
	{ "url_sub",    acl_parse_str,   acl_fetch_url,      acl_match_sub,  ACL_USE_L7REQ_VOLATILE },
	{ "url_dir",    acl_parse_str,   acl_fetch_url,      acl_match_dir,  ACL_USE_L7REQ_VOLATILE },
	{ "url_dom",    acl_parse_str,   acl_fetch_url,      acl_match_dom,  ACL_USE_L7REQ_VOLATILE },
	{ "url_reg",    acl_parse_reg,   acl_fetch_url,      acl_match_reg,  ACL_USE_L7REQ_VOLATILE },
	{ "url_ip",     acl_parse_ip,    acl_fetch_url_ip,   acl_match_ip,   ACL_USE_L7REQ_VOLATILE|ACL_MAY_LOOKUP },
	{ "url_port",   acl_parse_int,   acl_fetch_url_port, acl_match_int,  ACL_USE_L7REQ_VOLATILE },

	/* note: we should set hdr* to use ACL_USE_HDR_VOLATILE, and chdr* to use L7REQ_VOLATILE */
	{ "hdr",        acl_parse_str,   acl_fetch_chdr,    acl_match_str, ACL_USE_L7REQ_VOLATILE|ACL_MAY_LOOKUP },
	{ "hdr_reg",    acl_parse_reg,   acl_fetch_chdr,    acl_match_reg, ACL_USE_L7REQ_VOLATILE },
	{ "hdr_beg",    acl_parse_str,   acl_fetch_chdr,    acl_match_beg, ACL_USE_L7REQ_VOLATILE },
	{ "hdr_end",    acl_parse_str,   acl_fetch_chdr,    acl_match_end, ACL_USE_L7REQ_VOLATILE },
	{ "hdr_sub",    acl_parse_str,   acl_fetch_chdr,    acl_match_sub, ACL_USE_L7REQ_VOLATILE },
	{ "hdr_dir",    acl_parse_str,   acl_fetch_chdr,    acl_match_dir, ACL_USE_L7REQ_VOLATILE },
	{ "hdr_dom",    acl_parse_str,   acl_fetch_chdr,    acl_match_dom, ACL_USE_L7REQ_VOLATILE },
	{ "hdr_cnt",    acl_parse_int,   acl_fetch_chdr_cnt,acl_match_int, ACL_USE_L7REQ_VOLATILE },
	{ "hdr_val",    acl_parse_int,   acl_fetch_chdr_val,acl_match_int, ACL_USE_L7REQ_VOLATILE },
	{ "hdr_ip",     acl_parse_ip,    acl_fetch_chdr_ip, acl_match_ip,  ACL_USE_L7REQ_VOLATILE|ACL_MAY_LOOKUP },

	{ "shdr",       acl_parse_str,   acl_fetch_shdr,    acl_match_str, ACL_USE_L7RTR_VOLATILE|ACL_MAY_LOOKUP },
	{ "shdr_reg",   acl_parse_reg,   acl_fetch_shdr,    acl_match_reg, ACL_USE_L7RTR_VOLATILE },
	{ "shdr_beg",   acl_parse_str,   acl_fetch_shdr,    acl_match_beg, ACL_USE_L7RTR_VOLATILE },
	{ "shdr_end",   acl_parse_str,   acl_fetch_shdr,    acl_match_end, ACL_USE_L7RTR_VOLATILE },
	{ "shdr_sub",   acl_parse_str,   acl_fetch_shdr,    acl_match_sub, ACL_USE_L7RTR_VOLATILE },
	{ "shdr_dir",   acl_parse_str,   acl_fetch_shdr,    acl_match_dir, ACL_USE_L7RTR_VOLATILE },
	{ "shdr_dom",   acl_parse_str,   acl_fetch_shdr,    acl_match_dom, ACL_USE_L7RTR_VOLATILE },
	{ "shdr_cnt",   acl_parse_int,   acl_fetch_shdr_cnt,acl_match_int, ACL_USE_L7RTR_VOLATILE },
	{ "shdr_val",   acl_parse_int,   acl_fetch_shdr_val,acl_match_int, ACL_USE_L7RTR_VOLATILE },
	{ "shdr_ip",    acl_parse_ip,    acl_fetch_shdr_ip, acl_match_ip,  ACL_USE_L7RTR_VOLATILE|ACL_MAY_LOOKUP },

	{ "path",       acl_parse_str,   acl_fetch_path,   acl_match_str, ACL_USE_L7REQ_VOLATILE|ACL_MAY_LOOKUP },
	{ "path_reg",   acl_parse_reg,   acl_fetch_path,   acl_match_reg, ACL_USE_L7REQ_VOLATILE },
	{ "path_beg",   acl_parse_str,   acl_fetch_path,   acl_match_beg, ACL_USE_L7REQ_VOLATILE },
	{ "path_end",   acl_parse_str,   acl_fetch_path,   acl_match_end, ACL_USE_L7REQ_VOLATILE },
	{ "path_sub",   acl_parse_str,   acl_fetch_path,   acl_match_sub, ACL_USE_L7REQ_VOLATILE },
	{ "path_dir",   acl_parse_str,   acl_fetch_path,   acl_match_dir, ACL_USE_L7REQ_VOLATILE },
	{ "path_dom",   acl_parse_str,   acl_fetch_path,   acl_match_dom, ACL_USE_L7REQ_VOLATILE },

#if 0
	{ "line",       acl_parse_str,   acl_fetch_line,   acl_match_str   },
	{ "line_reg",   acl_parse_reg,   acl_fetch_line,   acl_match_reg   },
	{ "line_beg",   acl_parse_str,   acl_fetch_line,   acl_match_beg   },
	{ "line_end",   acl_parse_str,   acl_fetch_line,   acl_match_end   },
	{ "line_sub",   acl_parse_str,   acl_fetch_line,   acl_match_sub   },
	{ "line_dir",   acl_parse_str,   acl_fetch_line,   acl_match_dir   },
	{ "line_dom",   acl_parse_str,   acl_fetch_line,   acl_match_dom   },

	{ "cook",       acl_parse_str,   acl_fetch_cook,   acl_match_str   },
	{ "cook_reg",   acl_parse_reg,   acl_fetch_cook,   acl_match_reg   },
	{ "cook_beg",   acl_parse_str,   acl_fetch_cook,   acl_match_beg   },
	{ "cook_end",   acl_parse_str,   acl_fetch_cook,   acl_match_end   },
	{ "cook_sub",   acl_parse_str,   acl_fetch_cook,   acl_match_sub   },
	{ "cook_dir",   acl_parse_str,   acl_fetch_cook,   acl_match_dir   },
	{ "cook_dom",   acl_parse_str,   acl_fetch_cook,   acl_match_dom   },
	{ "cook_pst",   acl_parse_none,  acl_fetch_cook,   acl_match_pst   },
#endif

	{ "http_auth",       acl_parse_nothing, acl_fetch_http_auth, acl_match_auth, ACL_USE_L7REQ_PERMANENT },
	{ "http_auth_group", acl_parse_strcat,  acl_fetch_http_auth, acl_match_auth, ACL_USE_L7REQ_PERMANENT },
	{ "http_first_req",  acl_parse_nothing, acl_fetch_http_first_req, acl_match_nothing, ACL_USE_L7REQ_PERMANENT },
	{ NULL, NULL, NULL, NULL },
}};

/************************************************************************/
/*     The code below is dedicated to pattern fetching and matching     */
/************************************************************************/

/* extract the IP address from the last occurrence of specified header. Note
 * that we should normally first extract the string then convert it to IP,
 * but right now we have all the functions to do this seemlessly, and we will
 * be able to change that later without touching the configuration.
 */
static int
pattern_fetch_hdr_ip(struct proxy *px, struct session *l4, void *l7, int dir,
                     const struct pattern_arg *arg_p, int arg_i, union pattern_data *data)
{
	struct http_txn *txn = l7;

	data->ip.s_addr = htonl(get_ip_from_hdr2(&txn->req, arg_p->data.str.str, arg_p->data.str.len, &txn->hdr_idx, -1));
	return data->ip.s_addr != 0;
}

/*
 * Given a path string and its length, find the position of beginning of the
 * query string. Returns NULL if no query string is found in the path.
 *
 * Example: if path = "/foo/bar/fubar?yo=mama;ye=daddy", and n = 22:
 *
 * find_query_string(path, n) points to "yo=mama;ye=daddy" string.
 */
static inline char *find_query_string(char *path, size_t path_l)
{
	char *p;

	p = memchr(path, '?', path_l);
	return p ? p + 1 : NULL;
}

static inline int is_param_delimiter(char c)
{
	return c == '&' || c == ';';
}

/*
 * Given a url parameter, find the starting position of the first occurence,
 * or NULL if the parameter is not found.
 *
 * Example: if query_string is "yo=mama;ye=daddy" and url_param_name is "ye",
 * the function will return query_string+8.
 */
static char*
find_url_param_pos(char* query_string, size_t query_string_l,
                   char* url_param_name, size_t url_param_name_l)
{
	char *pos, *last;

	pos  = query_string;
	last = query_string + query_string_l - url_param_name_l - 1;

	while (pos <= last) {
		if (pos[url_param_name_l] == '=') {
			if (memcmp(pos, url_param_name, url_param_name_l) == 0)
				return pos;
			pos += url_param_name_l + 1;
		}
		while (pos <= last && !is_param_delimiter(*pos))
			pos++;
		pos++;
	}
	return NULL;
}

/*
 * Given a url parameter name, returns its value and size into *value and
 * *value_l respectively, and returns non-zero. If the parameter is not found,
 * zero is returned and value/value_l are not touched.
 */
static int
find_url_param_value(char* path, size_t path_l,
                     char* url_param_name, size_t url_param_name_l,
                     char** value, size_t* value_l)
{
	char *query_string, *qs_end;
	char *arg_start;
	char *value_start, *value_end;

	query_string = find_query_string(path, path_l);
	if (!query_string)
		return 0;

	qs_end = path + path_l;
	arg_start = find_url_param_pos(query_string, qs_end - query_string,
				       url_param_name, url_param_name_l);
	if (!arg_start)
		return 0;

	value_start = arg_start + url_param_name_l + 1;
	value_end = value_start;

	while ((value_end < qs_end) && !is_param_delimiter(*value_end))
		value_end++;

	*value = value_start;
	*value_l = value_end - value_start;
	return value_end != value_start;
}

static int
pattern_fetch_url_param(struct proxy *px, struct session *l4, void *l7, int dir,
                     const struct pattern_arg *arg_p, int arg_i, union pattern_data *data)
{
	struct http_txn *txn = l7;
	struct http_msg *msg = &txn->req;
	char  *url_param_value;
	size_t url_param_value_l;

	if (!find_url_param_value(msg->sol + msg->sl.rq.u, msg->sl.rq.u_l,
				  arg_p->data.str.str, arg_p->data.str.len,
				  &url_param_value, &url_param_value_l))
		return 0;

	data->str.str = url_param_value;
	data->str.len = url_param_value_l;
	return 1;
}


/************************************************************************/
/*             All supported keywords must be declared here.            */
/************************************************************************/
/* Note: must not be declared <const> as its list will be overwritten */
static struct pattern_fetch_kw_list pattern_fetch_keywords = {{ },{
	{ "hdr", pattern_fetch_hdr_ip, pattern_arg_str, PATTERN_TYPE_IP, PATTERN_FETCH_REQ },
	{ "url_param", pattern_fetch_url_param, pattern_arg_str, PATTERN_TYPE_STRING, PATTERN_FETCH_REQ },
	{ NULL, NULL, NULL, 0, 0 },
}};


__attribute__((constructor))
static void __http_protocol_init(void)
{
	acl_register_keywords(&acl_kws);
	pattern_register_fetches(&pattern_fetch_keywords);
}


/*
 * Local variables:
 *  c-indent-level: 8
 *  c-basic-offset: 8
 * End:
 */