/*
 * HTTP protocol analyzer
 *
 * Copyright 2000-2008 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/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/backend.h>
#include <proto/buffers.h>
#include <proto/client.h>
#include <proto/dumpstats.h>
#include <proto/fd.h>
#include <proto/log.h>
#include <proto/hdr_idx.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>

/* 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
};

const char *HTTP_301 =
	"HTTP/1.0 301 Moved Permantenly\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Location: "; /* not terminated since it will be concatenated with the URL */

const char *HTTP_302 =
	"HTTP/1.0 302 Found\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\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/1.0 303 See Other\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\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 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,
};


/*
 * 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;
	msg->eoh += 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;
	msg->eoh += 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.
 */
const char *find_hdr_value_end(const char *s, const char *e)
{
	int quoted, qdpair;

	quoted = qdpair = 0;
	for (; s < e; s++) {
		if (qdpair)                    qdpair = 0;
		else if (quoted && *s == '\\') qdpair = 1;
		else if (quoted && *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.
 */
int http_find_header2(const char *name, int len,
		      const char *sol, struct hdr_idx *idx,
		      struct hdr_ctx *ctx)
{
	const char *eol, *sov;
	int cur_idx;

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

			sov = sol + len + 1;
			while (sov < eol && http_is_lws[(unsigned char)*sov])
				sov++;
		return_hdr:
			ctx->line = sol;
			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;
		cur_idx = idx->v[cur_idx].next;
	}
	return 0;
}

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

/* 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_erase(si->ob);
	buffer_erase(si->ib);
	buffer_write_ena(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;
	memcpy(rdr.str, HTTP_302, rdr.len);

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

	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 > sizeof(trash) - 4) /* 4 for CRLF-CRLF */
		return;

	memcpy(rdr.str + rdr.len, path, len);
	rdr.len += len;
	memcpy(rdr.str + rdr.len, "\r\n\r\n", 4);
	rdr.len += 4;

	/* 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[4]     = "NIDV";		/* No cookie, Invalid cookie, cookie for a Down server, Valid cookie */
const char sess_set_cookie[8] = "N1I3PD5R";	/* No set-cookie, unknown, Set-Cookie Inserted, unknown,
					    	   Set-cookie seen and left unchanged (passive), Set-cookie Deleted,
						   unknown, Set-cookie Rewritten */
struct pool_head *pool2_requri;
struct pool_head *pool2_capture;

void http_sess_clflog(struct session *s)
{
	char pn[INET6_ADDRSTRLEN + strlen(":65535")];
	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->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
		inet_ntop(AF_INET6,
		          (const void *)&((struct sockaddr_in6 *)(&s->cli_addr))->sin6_addr,
		          pn, sizeof(pn));

	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_INET) ?
	             ntohs(((struct sockaddr_in *)&s->cli_addr)->sin_port) :
	             ntohs(((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->conn_retries > 0) ? (be->conn_retries - s->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;
			*(h++) = ' ';
			*(h++) = '\"';
			h = encode_string(h, tmpline + sizeof(tmpline) - 2,
			                  '#', hdr_encode_map, txn->req.cap[hdr]);
			*(h++) = '\"';
		}
	}

	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;
			*(h++) = ' ';
			*(h++) = '\"';
			h = encode_string(h, tmpline + sizeof(tmpline) - 2,
			                  '#', hdr_encode_map, txn->rsp.cap[hdr]);
			*(h++) = '\"';
		}
	}

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 + strlen(":65535")];
	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->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
		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",
		 pn,
		 (s->cli_addr.ss_family == AF_INET) ?
		 ntohs(((struct sockaddr_in *)&s->cli_addr)->sin_port) :
		 ntohs(((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->conn_retries>0)?(be->conn_retries - s->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)	{
	http_msg_rpver:
	case 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;

	http_msg_rpver_sp:
	case HTTP_MSG_RPVER_SP:
		if (likely(!HTTP_IS_LWS(*ptr))) {
			msg->sl.st.c = ptr - msg_buf;
			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;

	http_msg_rpcode:
	case 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->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->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->sl.st.r_l = 0;
		goto http_msg_rpline_eol;

	http_msg_rpcode_sp:
	case HTTP_MSG_RPCODE_SP:
		if (likely(!HTTP_IS_LWS(*ptr))) {
			msg->sl.st.r = ptr - msg_buf;
			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;

	http_msg_rpreason:
	case 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->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)	{
	http_msg_rqmeth:
	case 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;
		http_msg_req09_uri_e:
			msg->sl.rq.u_l = (ptr - msg_buf) - msg->sl.rq.u;
		http_msg_req09_ver:
			msg->sl.rq.v = ptr - msg_buf;
			msg->sl.rq.v_l = 0;
			goto http_msg_rqline_eol;
		}
		state = HTTP_MSG_ERROR;
		break;

	http_msg_rqmeth_sp:
	case HTTP_MSG_RQMETH_SP:
		if (likely(!HTTP_IS_LWS(*ptr))) {
			msg->sl.rq.u = ptr - msg_buf;
			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;

	http_msg_rquri:
	case 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->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;

	http_msg_rquri_sp:
	case HTTP_MSG_RQURI_SP:
		if (likely(!HTTP_IS_LWS(*ptr))) {
			msg->sl.rq.v = ptr - msg_buf;
			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;

	http_msg_rqver:
	case 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->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;
}


/*
 * 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.
 */
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).
	 */
	http_msg_rpbefore:
	case HTTP_MSG_RPBEFORE:
		if (likely(HTTP_IS_TOKEN(*ptr))) {
			if (likely(ptr == buf->data)) {
				msg->sol = ptr;
				msg->som = 0;
			} else {
#if PARSE_PRESERVE_EMPTY_LINES
				/* only skip empty leading lines, don't remove them */
				msg->sol = ptr;
				msg->som = ptr - buf->data;
#else
				/* Remove empty leading lines, as recommended by
				 * RFC2616. This takes a lot of time because we
				 * must move all the buffer backwards, but this
				 * is rarely needed. The method above will be
				 * cleaner when we'll be able to start sending
				 * the request from any place in the buffer.
				 */
				buf->lr = ptr;
				buffer_replace2(buf, buf->data, buf->lr, NULL, 0);
				msg->som = 0;
				msg->sol = buf->data;
				ptr = buf->data;
				end = buf->r;
#endif
			}
			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 */

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

	http_msg_rpver:
	case 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;

	http_msg_rpline_end:
	case 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
	 */
	http_msg_rqbefore:
	case HTTP_MSG_RQBEFORE:
		if (likely(HTTP_IS_TOKEN(*ptr))) {
			if (likely(ptr == buf->data)) {
				msg->sol = ptr;
				msg->som = 0;
			} else {
#if PARSE_PRESERVE_EMPTY_LINES
				/* only skip empty leading lines, don't remove them */
				msg->sol = ptr;
				msg->som = ptr - buf->data;
#else
				/* Remove empty leading lines, as recommended by
				 * RFC2616. This takes a lot of time because we
				 * must move all the buffer backwards, but this
				 * is rarely needed. The method above will be
				 * cleaner when we'll be able to start sending
				 * the request from any place in the buffer.
				 */
				buf->lr = ptr;
				buffer_replace2(buf, buf->data, buf->lr, NULL, 0);
				msg->som = 0;
				msg->sol = buf->data;
				ptr = buf->data;
				end = buf->r;
#endif
			}
			/* 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 */

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

	http_msg_rqmeth:
	case 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;

	http_msg_rqline_end:
	case 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
	 */
	http_msg_hdr_first:
	case 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;

	http_msg_hdr_name:
	case 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);

	http_msg_hdr_l1_sp:
	case 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;

	http_msg_hdr_l1_lf:
	case 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);

	http_msg_hdr_l1_lws:
	case 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;
		
	http_msg_hdr_val:
	case 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;

	http_msg_hdr_l2_lf:
	case 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);

	http_msg_hdr_l2_lws:
	case 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;

	http_msg_last_lf:
	case 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->eoh = msg->sol - buf->data;
		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;

	msg->sol = req->data + msg->som;
	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;
		msg->eoh += delta;
	}
	/* add HTTP version */
	delta = buffer_replace2(req, cur_end, cur_end, " HTTP/1.0\r\n", 11);
	msg->eoh += 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;
}

/* 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 + req->eoh  = end of processed headers / start of current one
	 *   req->data + req->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;
	struct http_txn *txn = &s->txn;
	struct http_msg *msg = &txn->req;

	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;

	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->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.
	 *
	 */

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

		/* 2: have we encountered a read error ? */
		else if (req->flags & BF_READ_ERROR) {
			/* we cannot return any message on error */
			if (msg->err_pos >= 0)
				http_capture_bad_message(&s->fe->invalid_req, s, req, msg, s->fe);
			msg->msg_state = HTTP_MSG_ERROR;
			req->analysers = 0;
			s->fe->failed_req++;
			if (!(s->flags & SN_ERR_MASK))
				s->flags |= SN_ERR_CLICL;
			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)) {
			/* read timeout : give up with an error message. */
			if (msg->err_pos >= 0)
				http_capture_bad_message(&s->fe->invalid_req, s, req, msg, s->fe);
			txn->status = 408;
			stream_int_retnclose(req->prod, error_message(s, HTTP_ERR_408));
			msg->msg_state = HTTP_MSG_ERROR;
			req->analysers = 0;
			s->fe->failed_req++;
			if (!(s->flags & SN_ERR_MASK))
				s->flags |= SN_ERR_CLITO;
			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 (msg->err_pos >= 0)
				http_capture_bad_message(&s->fe->invalid_req, s, req, msg, 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;
			s->fe->failed_req++;

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

		buffer_write_dis(req);
		req->flags |= BF_READ_DONTWAIT; /* try to get back here ASAP */

		/* just set the request timeout once at the beginning of the request */
		if (!tick_isset(req->analyse_exp))
			req->analyse_exp = tick_add_ifset(now_ms, s->be->timeout.httpreq);

		/* we're not ready yet */
		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.
	 */

	/* 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, s->fe);

	/* ensure we keep this pointer to the beginning of the message */
	msg->sol = req->data + msg->som;

	/*
	 * 1: identify the method
	 */
	txn->meth = find_http_meth(&req->data[msg->som], 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(&req->data[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;

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

	/* 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, 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->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 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 redirect_rule *rule;
	int cur_idx;

	if (unlikely(msg->msg_state != HTTP_MSG_BODY)) {
		/* we need more data */
		buffer_write_dis(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));
			goto return_prx_cond;
		}
	}

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

	/* We might have to check for "Connection:" */
	if (((s->fe->options | s->be->options) & (PR_O_HTTP_CLOSE|PR_O_FORCE_CLO)) &&
	    !(s->flags & SN_CONN_CLOSED)) {
		char *cur_ptr, *cur_end, *cur_next;
		int old_idx, delta, val;
		struct hdr_idx_elem *cur_hdr;

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

		while ((cur_idx = txn->hdr_idx.v[old_idx].next)) {
			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;

			val = http_header_match2(cur_ptr, cur_end, "Connection", 10);
			if (val) {
				/* 3 possibilities :
				 * - we have already set Connection: close,
				 *   so we remove this line.
				 * - we have not yet set Connection: close,
				 *   but this line indicates close. We leave
				 *   it untouched and set the flag.
				 * - we have not yet set Connection: close,
				 *   and this line indicates non-close. We
				 *   replace it.
				 */
				if (s->flags & SN_CONN_CLOSED) {
					delta = buffer_replace2(req, cur_ptr, cur_next, NULL, 0);
					txn->req.eoh += delta;
					cur_next += delta;
					txn->hdr_idx.v[old_idx].next = cur_hdr->next;
					txn->hdr_idx.used--;
					cur_hdr->len = 0;
				} else {
					if (strncasecmp(cur_ptr + val, "close", 5) != 0) {
						delta = buffer_replace2(req, cur_ptr + val, cur_end,
									"close", 5);
						cur_next += delta;
						cur_hdr->len += delta;
						txn->req.eoh += delta;
					}
					s->flags |= SN_CONN_CLOSED;
				}
			}
			old_idx = cur_idx;
		}
	}
	/* add request headers from the rule sets in the same order */
	for (cur_idx = 0; cur_idx < px->nb_reqadd; cur_idx++) {
		if (unlikely(http_header_add_tail(req,
						  &txn->req,
						  &txn->hdr_idx,
						  px->req_add[cur_idx])) < 0)
			goto return_bad_req;
	}

	/* check if stats URI was requested, and if an auth is needed */
	if (px->uri_auth != NULL &&
	    (txn->meth == HTTP_METH_GET || txn->meth == HTTP_METH_HEAD)) {
		/* we have to check the URI and auth for this request.
		 * FIXME!!! that one is rather dangerous, we want to
		 * make it follow standard rules (eg: clear req->analysers).
		 */
		if (stats_check_uri_auth(s, px)) {
			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_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 = { trash, 0 };
			const char *msg_fmt;

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

			if (unlikely(rdr.len > sizeof(trash)))
				goto return_bad_req;
			memcpy(rdr.str, msg_fmt, rdr.len);

			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 > sizeof(trash) - 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;
				break;
			}
			case REDIRECT_TYPE_LOCATION:
			default:
				if (rdr.len + rule->rdr_len > sizeof(trash) - 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 */
			memcpy(rdr.str + rdr.len, "\r\n\r\n", 4);
			rdr.len += 4;

			txn->status = rule->code;
			/* let's log the request time */
			s->logs.tv_request = now;
			stream_int_retnclose(req->prod, &rdr);
			goto return_prx_cond;
		}
	}

	/* 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, 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->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_write_dis(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);

	/*
	 * 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(req->data + msg->sl.rq.u, msg->sl.rq.u_l, &s->srv_addr);
	}

	/*
	 * 7: 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 */
	if (s->be->appsession_name) {
		get_srv_from_appsession(s, &req->data[msg->som], msg->sl.rq.l);
	}

	/*
	 * 8: 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);

	/*
	 * 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->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" if needed and not yet set.
	 * Note that we do not need to add it in case of HTTP/1.0.
	 */
	if (!(s->flags & SN_CONN_CLOSED) &&
	    ((s->fe->options | s->be->options) & (PR_O_HTTP_CLOSE|PR_O_FORCE_CLO))) {
		if ((unlikely(msg->sl.rq.v_l != 8) ||
		     unlikely(req->data[msg->som + msg->sl.rq.v + 7] != '0')) &&
		    unlikely(http_header_add_tail2(req, &txn->req, &txn->hdr_idx,
						   "Connection: close", 17)) < 0)
			goto return_bad_req;
		s->flags |= SN_CONN_CLOSED;
	}
	/* Before we switch to data, was assignment set in manage_client_side_cookie?
	 * If not assigned, perhaps we are balancing on url_param, but this is a
	 * POST; and the parameters are in the body, maybe scan there to find our server.
	 * (unless headers overflowed the buffer?)
	 */
	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 && !(req->flags & BF_FULL) &&
	    memchr(msg->sol + msg->sl.rq.u, '?', msg->sl.rq.u_l) == NULL) {
		/* are there enough bytes here? total == l || r || rlim ?
		 * len is unsigned, but eoh is int,
		 * how many bytes of body have we received?
		 * eoh is the first empty line of the header
		 */
		/* already established CRLF or LF at eoh, move to start of message, find message length in buffer */
		unsigned long len = req->l - (msg->sol[msg->eoh] == '\r' ? msg->eoh + 2 : msg->eoh + 1);

		/* If we have HTTP/1.1 and Expect: 100-continue, then abort.
		 * We can't assume responsibility for the server's decision,
		 * on this URI and header set. See rfc2616: 14.20, 8.2.3,
		 * We also can't change our mind later, about which server to choose, so round robin.
		 */
		if ((likely(msg->sl.rq.v_l == 8) && req->data[msg->som + msg->sl.rq.v + 7] == '1')) {
			struct hdr_ctx ctx;
			ctx.idx = 0;
			/* Expect is allowed in 1.1, look for it */
			http_find_header2("Expect", 6, msg->sol, &txn->hdr_idx, &ctx);
			if (ctx.idx != 0  &&
			    unlikely(ctx.vlen == 12 && strncasecmp(ctx.line+ctx.val, "100-continue", 12) == 0))
				/* We can't reliablly stall and wait for data, because of
				 * .NET clients that don't conform to rfc2616; so, no need for
				 * the next block to check length expectations.
				 * We could send 100 status back to the client, but then we need to
				 * re-write headers, and send the message. And this isn't the right
				 * place for that action.
				 * TODO: support Expect elsewhere and delete this block.
				 */
				goto end_check_maybe_wait_for_body;
		}

		if (likely(len > s->be->url_param_post_limit)) {
			/* nothing to do, we got enough */
		} else {
			/* limit implies we are supposed to need this many bytes
			 * to find the parameter. Let's see how many bytes we can wait for.
			 */
			long long hint = len;
			struct hdr_ctx ctx;
			ctx.idx = 0;
			http_find_header2("Transfer-Encoding", 17, msg->sol, &txn->hdr_idx, &ctx);
			if (ctx.idx && ctx.vlen >= 7 && strncasecmp(ctx.line+ctx.val, "chunked", 7) == 0) {
				buffer_write_dis(req);
				req->analysers |= AN_REQ_HTTP_BODY;
			}
			else {
				ctx.idx = 0;
				http_find_header2("Content-Length", 14, msg->sol, &txn->hdr_idx, &ctx);
				/* now if we have a length, we'll take the hint */
				if (ctx.idx) {
					/* We have Content-Length */
					if (strl2llrc(ctx.line+ctx.val,ctx.vlen, &hint))
						hint = 0;         /* parse failure, untrusted client */
					else {
						if (hint > 0)
							msg->hdr_content_len = hint;
						else
							hint = 0; /* bad client, sent negative length */
					}
				}
				/* but limited to what we care about, maybe we don't expect any entity data (hint == 0) */
				if (s->be->url_param_post_limit < hint)
					hint = s->be->url_param_post_limit;
				/* now do we really need to buffer more data? */
				if (len < hint) {
					buffer_write_dis(req);
					req->analysers |= AN_REQ_HTTP_BODY;
				}
				/* else... There are no body bytes to wait for */
			}
		}
	}
 end_check_maybe_wait_for_body:

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

	buffer_set_rlim(req, req->size); /* no more rewrite needed */
	s->logs.tv_request = now;

	/* 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_write_dis(req);
		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);
	}

	/* 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, 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->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.
	 */
	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->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_msg *msg = &s->txn.req;
	unsigned long body = msg->sol[msg->eoh] == '\r' ? msg->eoh + 2 : msg->eoh + 1;
	long long limit = s->be->url_param_post_limit;
	struct hdr_ctx ctx;

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

	/* 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.
	 */

	ctx.idx = 0;

	/* now if we have a length, we'll take the hint */
	http_find_header2("Transfer-Encoding", 17, msg->sol, &s->txn.hdr_idx, &ctx);
	if (ctx.idx && ctx.vlen >= 7 && strncasecmp(ctx.line+ctx.val, "chunked", 7) == 0) {
		unsigned int chunk = 0;
		while (body < req->l && !HTTP_IS_CRLF(msg->sol[body])) {
			char c = msg->sol[body];
			if (ishex(c)) {
				unsigned int hex = toupper(c) - '0';
				if (hex > 9)
					hex -= 'A' - '9' - 1;
				chunk = (chunk << 4) | hex;
			} else
				break;
			body++;
		}
		if (body + 2 >= req->l) /* we want CRLF too */
			goto http_body_end; /* end of buffer? data missing! */

		if (memcmp(msg->sol+body, "\r\n", 2) != 0)
			goto http_body_end; /* chunked encoding len ends with CRLF, and we don't have it yet */

		body += 2; // skip CRLF

		/* if we support more then one chunk here, we have to do it again when assigning server
		 * 1. how much entity data do we have? new var
		 * 2. should save entity_start, entity_cursor, elen & rlen in req; so we don't repeat scanning here
		 * 3. test if elen > limit, or set new limit to elen if 0 (end of entity found)
		 */

		if (chunk < limit)
			limit = chunk;                  /* only reading one chunk */
	} else {
		if (msg->hdr_content_len < limit)
			limit = msg->hdr_content_len;
	}

 http_body_end:
	/* we leave once we know we have nothing left to do. This means that we have
	 * enough bytes, or that we know we'll not get any more (buffer full, read
	 * buffer closed).
	 */
	if (req->l - body >= limit ||             /* enough bytes! */
	    req->flags & (BF_FULL | BF_READ_ERROR | BF_SHUTR | BF_READ_TIMEOUT) ||
	    tick_is_expired(req->analyse_exp, now_ms)) {
		/* 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;
	}
	else {
		/* 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_write_dis(req);
		if (!tick_isset(req->analyse_exp))
			req->analyse_exp = tick_add_ifset(now_ms, s->be->timeout.httpreq);
		return 0;
	}
}

/* This function performs all the processing enabled for the current response.
 * It normally returns zero, but may return 1 if it absolutely needs to be
 * called again after other functions. 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 process_response(struct session *t)
{
	struct http_txn *txn = &t->txn;
	struct buffer *req = t->req;
	struct buffer *rep = t->rep;

	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 (rep->analysers & AN_RTR_HTTP_HDR) { /* receiving server headers */
		/*
		 * 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 + rep->som  = beginning of response
		 *   rep->data + rep->eoh  = end of processed headers / start of current one
		 *   rep->data + rep->eol  = end of current header or line (LF or CRLF)
		 *   rep->lr = first non-visited byte
		 *   rep->r  = end of data
		 */

		int cur_idx;
		struct http_msg *msg = &txn->rsp;
		struct proxy *cur_proxy;

		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->msg_state == HTTP_MSG_BODY || msg->msg_state == HTTP_MSG_ERROR))) {
			char *eol, *sol;

			sol = rep->data + msg->som;
			eol = sol + msg->sl.rq.l;
			debug_hdr("srvrep", t, 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", t, 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(&t->be->invalid_rep, t, rep, msg, t->fe);

				buffer_shutr_now(rep);
				buffer_shutw_now(req);
				if (t->srv)
					t->srv->failed_resp++;
				t->be->failed_resp++;
				rep->analysers = 0;
				txn->status = 502;
				stream_int_return(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;
			}
			/* 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(&t->be->invalid_rep, t, rep, msg, t->fe);
				buffer_shutr_now(rep);
				buffer_shutw_now(req);
				if (t->srv)
					t->srv->failed_resp++;
				t->be->failed_resp++;
				rep->analysers = 0;
				txn->status = 502;
				stream_int_return(rep->cons, error_message(t, HTTP_ERR_502));
				if (!(t->flags & SN_ERR_MASK))
					t->flags |= SN_ERR_SRVCL;
				if (!(t->flags & SN_FINST_MASK))
					t->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(&t->be->invalid_rep, t, rep, msg, t->fe);
				buffer_shutr_now(rep);
				buffer_shutw_now(req);
				if (t->srv)
					t->srv->failed_resp++;
				t->be->failed_resp++;
				rep->analysers = 0;
				txn->status = 504;
				stream_int_return(rep->cons, error_message(t, HTTP_ERR_504));
				if (!(t->flags & SN_ERR_MASK))
					t->flags |= SN_ERR_SRVTO;
				if (!(t->flags & SN_FINST_MASK))
					t->flags |= SN_FINST_H;
				return 0;
			}
			/* close from server */
			else if (rep->flags & BF_SHUTR) {
				if (msg->err_pos >= 0)
					http_capture_bad_message(&t->be->invalid_rep, t, rep, msg, t->fe);
				buffer_shutw_now(req);
				if (t->srv)
					t->srv->failed_resp++;
				t->be->failed_resp++;
				rep->analysers = 0;
				txn->status = 502;
				stream_int_return(rep->cons, error_message(t, HTTP_ERR_502));
				if (!(t->flags & SN_ERR_MASK))
					t->flags |= SN_ERR_SRVCL;
				if (!(t->flags & SN_FINST_MASK))
					t->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(&t->be->invalid_rep, t, rep, msg, t->fe);
				buffer_shutr_now(rep);
				t->be->failed_resp++;
				rep->analysers = 0;
				if (!(t->flags & SN_ERR_MASK))
					t->flags |= SN_ERR_CLICL;
				if (!(t->flags & SN_FINST_MASK))
					t->flags |= SN_FINST_H;
				return 0;
			}
			buffer_write_dis(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 (msg->err_pos >= 0)
			http_capture_bad_message(&t->be->invalid_rep, t, rep, msg, t->fe);

		rep->analysers &= ~AN_RTR_HTTP_HDR;

		/* ensure we keep this pointer to the beginning of the message */
		msg->sol = rep->data + msg->som;

		/*
		 * 1: get the status code and check for cacheability.
		 */

		t->logs.logwait &= ~LW_RESP;
		txn->status = strl2ui(rep->data + msg->sl.st.c, msg->sl.st.c_l);

		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) &&
			    (t->be->options & (PR_O_CHK_CACHE|PR_O_COOK_NOC)))
				txn->flags |= TX_CACHEABLE | TX_CACHE_COOK;
			break;
		default:
			break;
		}

		/*
		 * 2: we may need to capture headers
		 */
		if (unlikely((t->logs.logwait & LW_RSPHDR) && t->fe->rsp_cap))
			capture_headers(rep->data + msg->som, &txn->hdr_idx,
					txn->rsp.cap, t->fe->rsp_cap);

		/*
		 * 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.
		 */

		t->flags &= ~SN_CONN_CLOSED; /* prepare for inspection */

		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->rsp_exp) < 0) {
				return_bad_resp:
					if (t->srv)
						t->srv->failed_resp++;
					cur_proxy->failed_resp++;
				return_srv_prx_502:
					buffer_shutr_now(rep);
					buffer_shutw_now(req);
					rep->analysers = 0;
					txn->status = 502;
					stream_int_return(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->failed_secu++;
				cur_proxy->denied_resp++;
				goto return_srv_prx_502;
			}

			/* We might have to check for "Connection:" */
			if (((t->fe->options | t->be->options) & (PR_O_HTTP_CLOSE|PR_O_FORCE_CLO)) &&
			    !(t->flags & SN_CONN_CLOSED)) {
				char *cur_ptr, *cur_end, *cur_next;
				int cur_idx, old_idx, delta, val;
				struct hdr_idx_elem *cur_hdr;

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

				while ((cur_idx = txn->hdr_idx.v[old_idx].next)) {
					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;

					val = http_header_match2(cur_ptr, cur_end, "Connection", 10);
					if (val) {
						/* 3 possibilities :
						 * - we have already set Connection: close,
						 *   so we remove this line.
						 * - we have not yet set Connection: close,
						 *   but this line indicates close. We leave
						 *   it untouched and set the flag.
						 * - we have not yet set Connection: close,
						 *   and this line indicates non-close. We
						 *   replace it.
						 */
						if (t->flags & SN_CONN_CLOSED) {
							delta = buffer_replace2(rep, cur_ptr, cur_next, NULL, 0);
							txn->rsp.eoh += delta;
							cur_next += delta;
							txn->hdr_idx.v[old_idx].next = cur_hdr->next;
							txn->hdr_idx.used--;
							cur_hdr->len = 0;
						} else {
							if (strncasecmp(cur_ptr + val, "close", 5) != 0) {
								delta = buffer_replace2(rep, cur_ptr + val, cur_end,
											"close", 5);
								cur_next += delta;
								cur_hdr->len += delta;
								txn->rsp.eoh += delta;
							}
							t->flags |= SN_CONN_CLOSED;
						}
					}
					old_idx = cur_idx;
				}
			}

			/* add response headers from the rule sets in the same order */
			for (cur_idx = 0; cur_idx < rule_set->nb_rspadd; cur_idx++) {
				if (unlikely(http_header_add_tail(rep, &txn->rsp, &txn->hdr_idx,
								  rule_set->rsp_add[cur_idx])) < 0)
					goto return_bad_resp;
			}

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

		/*
		 * 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->flags & SN_DIRECT) && (t->be->options & PR_O_COOK_INS) &&
		    (!(t->be->options & PR_O_COOK_POST) || (txn->meth == HTTP_METH_POST))) {
			int len;

			/* the server is known, it's not the one the client requested, 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.
			 */
			len = sprintf(trash, "Set-Cookie: %s=%s; path=/",
				      t->be->cookie_name,
				      t->srv->cookie ? t->srv->cookie : "; Expires=Thu, 01-Jan-1970 00:00:01 GMT");

			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_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_ANY)) ==
		     (TX_CACHEABLE | TX_CACHE_COOK | TX_SCK_ANY)) &&
		    (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->failed_secu++;
			t->be->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: add "Connection: close" if needed and not yet set.
		 * Note that we do not need to add it in case of HTTP/1.0.
		 */
		if (!(t->flags & SN_CONN_CLOSED) &&
		    ((t->fe->options | t->be->options) & (PR_O_HTTP_CLOSE|PR_O_FORCE_CLO))) {
			if ((unlikely(msg->sl.st.v_l != 8) ||
			     unlikely(req->data[msg->som + 7] != '0')) &&
			    unlikely(http_header_add_tail2(rep, &txn->rsp, &txn->hdr_idx,
							   "Connection: close", 17)) < 0)
				goto return_bad_resp;
			t->flags |= SN_CONN_CLOSED;
		}

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

		buffer_set_rlim(rep, rep->size); /* no more rewrite needed */
		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 0;
	}

	/* Note: eventhough nobody should set an unknown flag, clearing them right now will
	 * probably reduce one day's debugging session.
	 */
#ifdef DEBUG_DEV
	if (rep->analysers & ~(AN_RTR_HTTP_HDR)) {
		fprintf(stderr, "FIXME !!!! unknown analysers flags %s:%d = 0x%08X\n",
			__FILE__, __LINE__, rep->analysers);
		ABORT_NOW();
	}
#endif
	rep->analysers &= AN_RTR_HTTP_HDR;
	return 0;
}

/*
 * Produces data for the session <s> depending on its source. Expects to be
 * called with client socket shut down on input. Right now, only statistics can
 * be produced. It stops by itself by unsetting the BF_HIJACK flag from the
 * buffer, which it uses to keep on being called when there is free space in
 * the buffer, or simply by letting an empty buffer upon return.
 */
void produce_content(struct session *s, struct buffer *rep)
{
	if (s->data_source == DATA_SRC_NONE) {
		buffer_stop_hijack(rep);
		return;
	}
	else if (s->data_source == DATA_SRC_STATS) {
		/* dump server statistics */
		int ret = stats_dump_http(s, rep, s->be->uri_auth);
		if (ret >= 0)
			return;
		/* -1 indicates an error */
	}

	/* unknown data source or internal error */
	s->txn.status = 500;
	stream_int_retnclose(rep->cons, error_message(s, HTTP_ERR_500));
	if (!(s->flags & SN_ERR_MASK))
		s->flags |= SN_ERR_PRXCOND;
	if (!(s->flags & SN_FINST_MASK))
		s->flags |= SN_FINST_R;
	buffer_stop_hijack(rep);
	return;
}


/* 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 = req->data + txn->req.som + 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->denied_req++;
				break;

			case ACT_TARPIT:
				txn->flags |= TX_CLTARPIT;
				last_hdr = 1;
				t->be->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;
				txn->req.eoh += delta;
				break;

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

				/* FIXME: this should be a separate function */
				txn->req.eoh += 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 */
				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 = req->data + txn->req.som; /* should be equal to txn->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->denied_req++;
			done = 1;
			break;

		case ACT_TARPIT:
			txn->flags |= TX_CLTARPIT;
			t->be->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.
			 */

			txn->req.eoh += delta;
			cur_end += delta;

			txn->req.sol = req->data + txn->req.som; /* should be equal to txn->sol */
			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 <exp> to all headers in buffer <req> of session <t>.
 * 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 *t, struct buffer *req, struct hdr_exp *exp)
{
	struct http_txn *txn = &t->txn;
	/* iterate through the filters in the outer loop */
	while (exp && !(txn->flags & (TX_CLDENY|TX_CLTARPIT))) {
		int ret;

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

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

		/* Apply the filter to the request line. */
		ret = apply_filter_to_req_line(t, 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(t, req, exp);
		}
		exp = exp->next;
	}
	return 0;
}


/*
 * Manage client-side cookie. It can impact performance by about 2% so it is
 * desirable to call it only when needed.
 */
void manage_client_side_cookies(struct session *t, struct buffer *req)
{
	struct http_txn *txn = &t->txn;
	char *p1, *p2, *p3, *p4;
	char *del_colon, *del_cookie, *colon;
	int app_cookies;

	appsess *asession_temp = NULL;
	appsess local_asession;

	char *cur_ptr, *cur_end, *cur_next;
	int cur_idx, old_idx;

	/* Iterate through the headers.
	 * we start with the start line.
	 */
	old_idx = 0;
	cur_next = req->data + txn->req.som + 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];
		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, "Cookie", 6);
		if (!val) {
			old_idx = cur_idx;
			continue;
		}

		/* 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
		 */

		colon = p1 = cur_ptr + val; /* first non-space char after 'Cookie:' */

		/* del_cookie == NULL => nothing to be deleted */
		del_colon = del_cookie = NULL;
		app_cookies = 0;
		
		while (p1 < cur_end) {
			/* skip spaces and colons, but keep an eye on these ones */
			while (p1 < cur_end) {
				if (*p1 == ';' || *p1 == ',')
					colon = p1;
				else if (!isspace((unsigned char)*p1))
					break;
				p1++;
			}

			if (p1 == cur_end)
				break;
		    
			/* p1 is at the beginning of the cookie name */
			p2 = p1;
			while (p2 < cur_end && *p2 != '=')
				p2++;

			if (p2 == cur_end)
				break;

			p3 = p2 + 1; /* skips the '=' sign */
			if (p3 == cur_end)
				break;
		    
			p4 = p3;
			while (p4 < cur_end && !isspace((unsigned char)*p4) && *p4 != ';' && *p4 != ',')
				p4++;

			/* here, we have the cookie name between p1 and p2,
			 * and its value between p3 and p4.
			 * we can process it :
			 *
			 * Cookie: NAME=VALUE;
			 * |      ||   ||    |
			 * |      ||   ||    +--> p4
			 * |      ||   |+-------> p3
			 * |      ||   +--------> p2
			 * |      |+------------> p1
			 * |      +-------------> colon
			 * +--------------------> cur_ptr
			 */
		    
			if (*p1 == '$') {
				/* skip this one */
			}
			else {
				/* first, let's see if we want to capture it */
				if (t->fe->capture_name != NULL &&
				    txn->cli_cookie == NULL &&
				    (p4 - p1 >= t->fe->capture_namelen) &&
				    memcmp(p1, t->fe->capture_name, t->fe->capture_namelen) == 0) {
					int log_len = p4 - p1;

					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, p1, log_len);
						txn->cli_cookie[log_len] = 0;
					}
				}

				if ((p2 - p1 == t->be->cookie_len) && (t->be->cookie_name != NULL) &&
				    (memcmp(p1, t->be->cookie_name, p2 - p1) == 0)) {
					/* Cool... it's the right one */
					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 betweek p3 and delim, and the original cookie between
					 * delim+1 and p4. Otherwise, delim==p4 :
					 *
					 * Cookie: NAME=SRV~VALUE;
					 * |      ||   ||  |     |
					 * |      ||   ||  |     +--> p4
					 * |      ||   ||  +--------> delim
					 * |      ||   |+-----------> p3
					 * |      ||   +------------> p2
					 * |      |+----------------> p1
					 * |      +-----------------> colon
					 * +------------------------> cur_ptr
					 */

					if (t->be->options & PR_O_COOK_PFX) {
						for (delim = p3; delim < p4; delim++)
							if (*delim == COOKIE_DELIM)
								break;
					}
					else
						delim = p4;


					/* 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.
					 */
					if (delim == p3)
						srv = NULL;

					while (srv) {
						if (srv->cookie && (srv->cklen == delim - p3) &&
						    !memcmp(p3, srv->cookie, delim - p3)) {
							if (srv->state & SRV_RUNNING || t->be->options & PR_O_PERSIST) {
								/* we found the server and it's usable */
								txn->flags &= ~TX_CK_MASK;
								txn->flags |= TX_CK_VALID;
								t->flags |= SN_DIRECT | SN_ASSIGNED;
								t->srv = srv;
								break;
							} else {
								/* we found a server, but it's down */
								txn->flags &= ~TX_CK_MASK;
								txn->flags |= TX_CK_DOWN;
							}
						}
						srv = srv->next;
					}

					if (!srv && !(txn->flags & TX_CK_DOWN)) {
						/* 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 != p4)) {
						int delta; /* negative */

						delta = buffer_replace2(req, p3, delim + 1, NULL, 0);
						p4  += delta;
						cur_end += delta;
						cur_next += delta;
						cur_hdr->len += delta;
						txn->req.eoh += delta;

						del_cookie = del_colon = NULL;
						app_cookies++;	/* protect the header from deletion */
					}
					else if (del_cookie == NULL &&
						 (t->be->options & (PR_O_COOK_INS | PR_O_COOK_IND)) == (PR_O_COOK_INS | PR_O_COOK_IND)) {
						del_cookie = p1;
						del_colon = colon;
					}
				} else {
					/* now we know that we must keep this cookie since it's
					 * not ours. But if we wanted to delete our cookie
					 * earlier, we cannot remove the complete header, but we
					 * can remove the previous block itself.
					 */
					app_cookies++;

					if (del_cookie != NULL) {
						int delta; /* negative */

						delta = buffer_replace2(req, del_cookie, p1, NULL, 0);
						p4  += delta;
						cur_end += delta;
						cur_next += delta;
						cur_hdr->len += delta;
						txn->req.eoh += delta;
						del_cookie = del_colon = NULL;
					}
				}

				if ((t->be->appsession_name != NULL) &&
				    (memcmp(p1, t->be->appsession_name, p2 - p1) == 0)) {
					/* first, let's see if the cookie is our appcookie*/

					/* Cool... it's the right one */

					asession_temp = &local_asession;
			  
					if ((asession_temp->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(asession_temp->sessid, p3, t->be->appsession_len);
					asession_temp->sessid[t->be->appsession_len] = 0;
					asession_temp->serverid = NULL;

					/* only do insert, if lookup fails */
					asession_temp = appsession_hash_lookup(&(t->be->htbl_proxy), asession_temp->sessid);
					if (asession_temp == NULL) {
						if ((asession_temp = pool_alloc2(pool2_appsess)) == NULL) {
							/* free previously allocated memory */
							pool_free2(apools.sessid, local_asession.sessid);
							Alert("Not enough memory process_cli():asession:calloc().\n");
							send_log(t->be, LOG_ALERT, "Not enough memory process_cli():asession:calloc().\n");
							return;
						}

						asession_temp->sessid = local_asession.sessid;
						asession_temp->serverid = local_asession.serverid;
						asession_temp->request_count = 0;
						appsession_hash_insert(&(t->be->htbl_proxy), asession_temp);
					} else {
						/* free previously allocated memory */
						pool_free2(apools.sessid, local_asession.sessid);
					}
					if (asession_temp->serverid == NULL) {
						/* TODO redispatch request */
						Alert("Found Application Session without matching server.\n");
					} else {
						struct server *srv = t->be->srv;
						while (srv) {
							if (strcmp(srv->id, asession_temp->serverid) == 0) {
								if (srv->state & SRV_RUNNING || t->be->options & PR_O_PERSIST) {
									/* we found the server and it's usable */
									txn->flags &= ~TX_CK_MASK;
									txn->flags |= TX_CK_VALID;
									t->flags |= SN_DIRECT | SN_ASSIGNED;
									t->srv = srv;
									break;
								} else {
									txn->flags &= ~TX_CK_MASK;
									txn->flags |= TX_CK_DOWN;
								}
							}
							srv = srv->next;
						}/* end while(srv) */
					}/* end else if server == NULL */

					asession_temp->expire = tick_add_ifset(now_ms, t->be->timeout.appsession);
					asession_temp->request_count++;
#if defined(DEBUG_HASH)
					Alert("manage_client_side_cookies\n");
					appsession_hash_dump(&(t->be->htbl_proxy));
#endif
				}/* end if ((t->proxy->appsession_name != NULL) ... */
			}

			/* we'll have to look for another cookie ... */
			p1 = p4;
		} /* while (p1 < cur_end) */

		/* There's no more cookie on this line.
		 * We may have marked the last one(s) for deletion.
		 * We must do this now in two ways :
		 *  - if there is no app cookie, we simply delete the header ;
		 *  - if there are app cookies, we must delete the end of the
		 *    string properly, including the colon/semi-colon before
		 *    the cookie name.
		 */
		if (del_cookie != NULL) {
			int delta;
			if (app_cookies) {
				delta = buffer_replace2(req, del_colon, cur_end, NULL, 0);
				cur_end = del_colon;
				cur_hdr->len += delta;
			} else {
				delta = buffer_replace2(req, cur_ptr, cur_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_next += delta;
			txn->req.eoh += delta;
		}

		/* keep the link from this header to next one */
		old_idx = cur_idx;
	} /* end of cookie processing on this header */
}


/* 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 = rtr->data + txn->rsp.som + 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;
				txn->rsp.eoh += delta;
				break;

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

				/* FIXME: this should be a separate function */
				txn->rsp.eoh += 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 */
				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 = rtr->data + txn->rsp.som; /* should be equal to txn->sol */
	cur_end = cur_ptr + txn->rsp.sl.rq.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.
			 */

			txn->rsp.eoh += delta;
			cur_end += delta;

			txn->rsp.sol = rtr->data + txn->rsp.som; /* should be equal to txn->sol */
			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(rtr->data + txn->rsp.sl.st.c, txn->rsp.sl.st.c_l);
			hdr_idx_set_start(&txn->hdr_idx, txn->rsp.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 resp filters <exp> to all headers in buffer <rtr> of session <t>.
 * Returns 0 if everything is alright, or -1 in case a replacement lead to an
 * unparsable response.
 */
int apply_filters_to_response(struct session *t, struct buffer *rtr, struct hdr_exp *exp)
{
	struct http_txn *txn = &t->txn;
	/* iterate through the filters in the outer loop */
	while (exp && !(txn->flags & TX_SVDENY)) {
		int ret;

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

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

		/* Apply the filter to the status line. */
		ret = apply_filter_to_sts_line(t, 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(t, rtr, exp);
		}
		exp = exp->next;
	}
	return 0;
}


/*
 * Manage server-side cookies. It can impact performance by about 2% so it is
 * desirable to call it only when needed.
 */
void manage_server_side_cookies(struct session *t, struct buffer *rtr)
{
	struct http_txn *txn = &t->txn;
	char *p1, *p2, *p3, *p4;

	appsess *asession_temp = NULL;
	appsess local_asession;

	char *cur_ptr, *cur_end, *cur_next;
	int cur_idx, old_idx, delta;

	/* Iterate through the headers.
	 * we start with the start line.
	 */
	old_idx = 0;
	cur_next = rtr->data + txn->rsp.som + 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];
		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, "Set-Cookie", 10);
		if (!val) {
			old_idx = cur_idx;
			continue;
		}

		/* OK, right now we know we have a set-cookie at cur_ptr */
		txn->flags |= TX_SCK_ANY;


		/* maybe we only wanted to see if there was a set-cookie. Note that
		 * the cookie capture is declared in the fronend.
		 */
		if (t->be->cookie_name == NULL &&
		    t->be->appsession_name == NULL &&
		    t->fe->capture_name == NULL)
			return;

		p1 = cur_ptr + val; /* first non-space char after 'Set-Cookie:' */
		
		while (p1 < cur_end) { /* in fact, we'll break after the first cookie */
			if (p1 == cur_end || *p1 == ';') /* end of cookie */
				break;

			/* p1 is at the beginning of the cookie name */
			p2 = p1;

			while (p2 < cur_end && *p2 != '=' && *p2 != ';')
				p2++;

			if (p2 == cur_end || *p2 == ';') /* next cookie */
				break;

			p3 = p2 + 1; /* skip the '=' sign */
			if (p3 == cur_end)
				break;

			p4 = p3;
			while (p4 < cur_end && !isspace((unsigned char)*p4) && *p4 != ';')
				p4++;

			/* here, we have the cookie name between p1 and p2,
			 * and its value between p3 and p4.
			 * we can process it.
			 */

			/* first, let's see if we want to capture it */
			if (t->fe->capture_name != NULL &&
			    txn->srv_cookie == NULL &&
			    (p4 - p1 >= t->fe->capture_namelen) &&
			    memcmp(p1, t->fe->capture_name, t->fe->capture_namelen) == 0) {
				int log_len = p4 - p1;

				if ((txn->srv_cookie = pool_alloc2(pool2_capture)) == NULL) {
					Alert("HTTP logging : out of memory.\n");
				}

				if (log_len > t->fe->capture_len)
					log_len = t->fe->capture_len;
				memcpy(txn->srv_cookie, p1, log_len);
				txn->srv_cookie[log_len] = 0;
			}

			/* now check if we need to process it for persistence */
			if ((p2 - p1 == t->be->cookie_len) && (t->be->cookie_name != NULL) &&
			    (memcmp(p1, t->be->cookie_name, p2 - p1) == 0)) {
				/* Cool... it's the right one */
				txn->flags |= TX_SCK_SEEN;
			
				/* 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->srv) && (t->be->options & PR_O_COOK_INS)) ||
				    ((t->flags & SN_DIRECT) && (t->be->options & PR_O_COOK_IND))) {
					/* this header must be deleted */
					delta = buffer_replace2(rtr, cur_ptr, cur_next, NULL, 0);
					txn->hdr_idx.v[old_idx].next = cur_hdr->next;
					txn->hdr_idx.used--;
					cur_hdr->len = 0;
					cur_next += delta;
					txn->rsp.eoh += delta;

					txn->flags |= TX_SCK_DELETED;
				}
				else if ((t->srv) && (t->srv->cookie) &&
					 (t->be->options & PR_O_COOK_RW)) {
					/* replace bytes p3->p4 with the cookie name associated
					 * with this server since we know it.
					 */
					delta = buffer_replace2(rtr, p3, p4, t->srv->cookie, t->srv->cklen);
					cur_hdr->len += delta;
					cur_next += delta;
					txn->rsp.eoh += delta;

					txn->flags |= TX_SCK_INSERTED | TX_SCK_DELETED;
				}
				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 delimitor between them..
					 */
					delta = buffer_replace2(rtr, p3, p3, t->srv->cookie, t->srv->cklen + 1);
					cur_hdr->len += delta;
					cur_next += delta;
					txn->rsp.eoh += delta;

					p3[t->srv->cklen] = COOKIE_DELIM;
					txn->flags |= TX_SCK_INSERTED | TX_SCK_DELETED;
				}
			}
			/* next, let's see if the cookie is our appcookie */
			else if ((t->be->appsession_name != NULL) &&
			         (memcmp(p1, t->be->appsession_name, p2 - p1) == 0)) {

				/* Cool... it's the right one */

				size_t server_id_len = strlen(t->srv->id) + 1;
				asession_temp = &local_asession;
		      
				if ((asession_temp->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(asession_temp->sessid, p3, t->be->appsession_len);
				asession_temp->sessid[t->be->appsession_len] = 0;
				asession_temp->serverid = NULL;

				/* only do insert, if lookup fails */
				asession_temp = appsession_hash_lookup(&(t->be->htbl_proxy), asession_temp->sessid);
				if (asession_temp == NULL) {
					if ((asession_temp = 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_temp->sessid = local_asession.sessid;
					asession_temp->serverid = local_asession.serverid;
					asession_temp->request_count = 0;
					appsession_hash_insert(&(t->be->htbl_proxy), asession_temp);
				} else {
					/* free wasted memory */
					pool_free2(apools.sessid, local_asession.sessid);
				}

				if (asession_temp->serverid == NULL) {
					if ((asession_temp->serverid = pool_alloc2(apools.serverid)) == 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;
					}
					asession_temp->serverid[0] = '\0';
				}
		      
				if (asession_temp->serverid[0] == '\0')
					memcpy(asession_temp->serverid, t->srv->id, server_id_len);
		      
				asession_temp->expire = tick_add_ifset(now_ms, t->be->timeout.appsession);
				asession_temp->request_count++;
#if defined(DEBUG_HASH)
				Alert("manage_server_side_cookies\n");
				appsession_hash_dump(&(t->be->htbl_proxy));
#endif
			}/* end if ((t->proxy->appsession_name != NULL) ... */
			break; /* we don't want to loop again since there cannot be another cookie on the same line */
		} /* we're now at the end of the cookie value */

		/* keep the link from this header to next one */
		old_idx = cur_idx;
	} /* end of cookie processing on this header */
}


/*
 * 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 = rtr->data + txn->rsp.som + 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)
{
	struct http_txn *txn = &t->txn;
	appsess *asession_temp = NULL;
	appsess local_asession;
	char *request_line;

	if (t->be->appsession_name == NULL ||
	    (t->txn.meth != HTTP_METH_GET && t->txn.meth != HTTP_METH_POST) ||
	    (request_line = memchr(begin, ';', len)) == NULL ||
	    ((1 + t->be->appsession_name_len + 1 + t->be->appsession_len) > (begin + len - request_line)))
		return;

	/* skip ';' */
	request_line++;

	/* look if we have a jsessionid */
	if (strncasecmp(request_line, t->be->appsession_name, t->be->appsession_name_len) != 0)
		return;

	/* skip jsessionid= */
	request_line += t->be->appsession_name_len + 1;
	
	/* First try if we already have an appsession */
	asession_temp = &local_asession;
	
	if ((asession_temp->sessid = pool_alloc2(apools.sessid)) == NULL) {
		Alert("Not enough memory process_cli():asession_temp->sessid:calloc().\n");
		send_log(t->be, LOG_ALERT, "Not enough Memory process_cli():asession_temp->sessid:calloc().\n");
		return;
	}
	
	/* Copy the sessionid */
	memcpy(asession_temp->sessid, request_line, t->be->appsession_len);
	asession_temp->sessid[t->be->appsession_len] = 0;
	asession_temp->serverid = NULL;
	
	/* only do insert, if lookup fails */
	asession_temp = appsession_hash_lookup(&(t->be->htbl_proxy), asession_temp->sessid);
	if (asession_temp == NULL) {
		if ((asession_temp = pool_alloc2(pool2_appsess)) == NULL) {
			/* free previously allocated memory */
			pool_free2(apools.sessid, local_asession.sessid);
			Alert("Not enough memory process_cli():asession:calloc().\n");
			send_log(t->be, LOG_ALERT, "Not enough memory process_cli():asession:calloc().\n");
			return;
		}
		asession_temp->sessid = local_asession.sessid;
		asession_temp->serverid = local_asession.serverid;
		asession_temp->request_count=0;
		appsession_hash_insert(&(t->be->htbl_proxy), asession_temp);
	}
	else {
		/* free previously allocated memory */
		pool_free2(apools.sessid, local_asession.sessid);
	}

	asession_temp->expire = tick_add_ifset(now_ms, t->be->timeout.appsession);
	asession_temp->request_count++;

#if defined(DEBUG_HASH)
	Alert("get_srv_from_appsession\n");
	appsession_hash_dump(&(t->be->htbl_proxy));
#endif
	if (asession_temp->serverid == NULL) {
		/* TODO redispatch request */
		Alert("Found Application Session without matching server.\n");
	} else {
		struct server *srv = t->be->srv;
		while (srv) {
			if (strcmp(srv->id, asession_temp->serverid) == 0) {
				if (srv->state & SRV_RUNNING || t->be->options & PR_O_PERSIST) {
					/* we found the server and it's usable */
					txn->flags &= ~TX_CK_MASK;
					txn->flags |= TX_CK_VALID;
					t->flags |= SN_DIRECT | SN_ASSIGNED;
					t->srv = srv;
					break;
				} else {
					txn->flags &= ~TX_CK_MASK;
					txn->flags |= TX_CK_DOWN;
				}
			}
			srv = srv->next;
		}
	}
}


/*
 * In a GET or HEAD request, check if the requested URI matches the stats uri
 * for the current backend, and if an authorization has been passed and is valid.
 *
 * It is assumed that the request is either a HEAD or GET and that the
 * t->be->uri_auth field is valid. An HTTP/401 response may be sent, or
 * produce_content() can be called to start sending data.
 *
 * Returns 1 if the session's state changes, otherwise 0.
 */
int stats_check_uri_auth(struct session *t, struct proxy *backend)
{
	struct http_txn *txn = &t->txn;
	struct uri_auth *uri_auth = backend->uri_auth;
	struct user_auth *user;
	int authenticated, cur_idx;
	char *h;

	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 = t->req->data + 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 <= t->req->data + 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 = t->req->data + txn->req.sl.rq.u + uri_auth->uri_len;
		while (h <= t->req->data + 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 = t->req->data + txn->req.sl.rq.u + uri_auth->uri_len;
	while (h <= t->req->data + 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++;
	}

	t->data_ctx.stats.flags |= STAT_SHOW_STAT | STAT_SHOW_INFO;

	/* we are in front of a interceptable URI. Let's check
	 * if there's an authentication and if it's valid.
	 */
	user = uri_auth->users;
	if (!user) {
		/* no user auth required, it's OK */
		authenticated = 1;
	} else {
		authenticated = 0;

		/* a user list is defined, we have to check.
		 * skip 21 chars for "Authorization: Basic ".
		 */

		/* FIXME: this should move to an earlier place */
		cur_idx = 0;
		h = t->req->data + txn->req.som + hdr_idx_first_pos(&txn->hdr_idx);
		while ((cur_idx = txn->hdr_idx.v[cur_idx].next)) {
			int len = txn->hdr_idx.v[cur_idx].len;
			if (len > 14 &&
			    !strncasecmp("Authorization:", h, 14)) {
				txn->auth_hdr.str = h;
				txn->auth_hdr.len = len;
				break;
			}
			h += len + txn->hdr_idx.v[cur_idx].cr + 1;
		}

		if (txn->auth_hdr.len < 21 ||
		    memcmp(txn->auth_hdr.str + 14, " Basic ", 7))
			user = NULL;

		while (user) {
			if ((txn->auth_hdr.len == user->user_len + 14 + 7)
			    && !memcmp(txn->auth_hdr.str + 14 + 7,
				       user->user_pwd, user->user_len)) {
				authenticated = 1;
				break;
			}
			user = user->next;
		}
	}

	if (!authenticated) {
		struct chunk msg;

		/* no need to go further */
		msg.str = trash;
		msg.len = sprintf(trash, HTTP_401_fmt, uri_auth->auth_realm);
		txn->status = 401;
		stream_int_retnclose(t->req->prod, &msg);
		t->req->analysers = 0;
		if (!(t->flags & SN_ERR_MASK))
			t->flags |= SN_ERR_PRXCOND;
		if (!(t->flags & SN_FINST_MASK))
			t->flags |= SN_FINST_R;
		return 1;
	}

	/* The request is valid, the user is authenticated. Let's start sending
	 * data.
	 */
	buffer_write_dis(t->req);
	buffer_shutw_now(t->req);
	buffer_shutr_now(t->rep);
	t->logs.tv_request = now;
	t->data_source = DATA_SRC_STATS;
	t->data_state  = DATA_ST_INIT;
	t->task->nice = -32; /* small boost for HTTP statistics */
	buffer_install_hijacker(t, t->rep, produce_content);
	return 1;
}

/*
 * Capture a bad request or response and archive it in the proxy's structure.
 */
void http_capture_bad_message(struct error_snapshot *es, struct session *s,
                              struct buffer *buf, struct http_msg *msg,
			      struct proxy *other_end)
{
	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
		es->pos  = buf->lr - (buf->data + msg->som);
	es->when = date; // user-visible date
	es->sid  = s->uniq_id;
	es->srv  = s->srv;
	es->oe   = other_end;
	es->src  = s->cli_addr;
}

/*
 * 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);
}


/************************************************************************/
/*        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 - txn->req.som;

	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 - txn->rsp.som;

	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);
}

/* 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.
	 */
	msg->sol = req->data + msg->som;
	txn->meth = find_http_meth(&req->data[msg->som], 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;
}


/************************************************************************/
/*             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  },
	{ "resp_ver",   acl_parse_ver,   acl_fetch_stver,  acl_match_str,  ACL_USE_L7RTR_VOLATILE  },
	{ "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 },
	{ "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 },
	{ "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 },
	{ "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 },

	{ "shdr",       acl_parse_str,   acl_fetch_shdr,    acl_match_str, ACL_USE_L7RTR_VOLATILE },
	{ "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 },

	{ "path",       acl_parse_str,   acl_fetch_path,   acl_match_str, ACL_USE_L7REQ_VOLATILE },
	{ "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 },

	{ NULL, NULL, NULL, NULL },

#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   },

	{ "auth_user",  acl_parse_str,   acl_fetch_user,   acl_match_str   },
	{ "auth_regex", acl_parse_reg,   acl_fetch_user,   acl_match_reg   },
	{ "auth_clear", acl_parse_str,   acl_fetch_auth,   acl_match_str   },
	{ "auth_md5",   acl_parse_str,   acl_fetch_auth,   acl_match_md5   },
	{ NULL, NULL, NULL, NULL },
#endif
}};


__attribute__((constructor))
static void __http_protocol_init(void)
{
	acl_register_keywords(&acl_kws);
}


/*
 * Local variables:
 *  c-indent-level: 8
 *  c-basic-offset: 8
 * End:
 */