src/flt_spoe.c

/*
 * Stream processing offload engine management.
 *
 * Copyright 2016 HAProxy Technologies, Christopher Faulet <cfaulet@haproxy.com>
 *
 * 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 <common/buffer.h>
#include <common/cfgparse.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/debug.h>
#include <common/memory.h>
#include <common/time.h>

#include <types/arg.h>
#include <types/filters.h>
#include <types/global.h>
#include <types/proxy.h>
#include <types/sample.h>
#include <types/stream.h>

#include <proto/arg.h>
#include <proto/backend.h>
#include <proto/filters.h>
#include <proto/frontend.h>
#include <proto/log.h>
#include <proto/proto_http.h>
#include <proto/proxy.h>
#include <proto/sample.h>
#include <proto/session.h>
#include <proto/signal.h>
#include <proto/stream.h>
#include <proto/stream_interface.h>
#include <proto/task.h>
#include <proto/vars.h>

#if defined(DEBUG_SPOE) || defined(DEBUG_FULL)
#define SPOE_PRINTF(x...) fprintf(x)
#else
#define SPOE_PRINTF(x...)
#endif

/* Helper to get ctx inside an appctx */
#define APPCTX_SPOE(appctx) ((appctx)->ctx.spoe)

/* TODO: add an option to customize these values */
/* The maximum number of new applet waiting the end of the hello handshake */
#define MAX_NEW_SPOE_APPLETS 5

/* The maximum number of error when a stream is waiting of a SPOE applet */
#define MAX_NEW_SPOE_APPLET_ERRS 3

/* Minimal size for a frame */
#define MIN_FRAME_SIZE 256

/* Flags set on the SPOE context */
#define SPOE_CTX_FL_CLI_CONNECTED 0x00000001 /* Set after that on-client-session event was processed */
#define SPOE_CTX_FL_SRV_CONNECTED 0x00000002 /* Set after that on-server-session event was processed */
#define SPOE_CTX_FL_REQ_PROCESS   0x00000004 /* Set when SPOE is processing the request */
#define SPOE_CTX_FL_RSP_PROCESS   0x00000008 /* Set when SPOE is processing the response */

#define SPOE_CTX_FL_PROCESS (SPOE_CTX_FL_REQ_PROCESS|SPOE_CTX_FL_RSP_PROCESS)

#define SPOE_APPCTX_ERR_NONE    0x00000000 /* no error yet, leave it to zero */
#define SPOE_APPCTX_ERR_TOUT    0x00000001 /* SPOE applet timeout */

/* All possible states for a SPOE context */
enum spoe_ctx_state {
	SPOE_CTX_ST_NONE = 0,
	SPOE_CTX_ST_READY,
	SPOE_CTX_ST_SENDING_MSGS,
	SPOE_CTX_ST_WAITING_ACK,
	SPOE_CTX_ST_DONE,
	SPOE_CTX_ST_ERROR,
};

/* All possible states for a SPOE applet */
enum spoe_appctx_state {
	SPOE_APPCTX_ST_CONNECT = 0,
	SPOE_APPCTX_ST_CONNECTING,
	SPOE_APPCTX_ST_PROCESSING,
	SPOE_APPCTX_ST_DISCONNECT,
	SPOE_APPCTX_ST_DISCONNECTING,
	SPOE_APPCTX_ST_EXIT,
	SPOE_APPCTX_ST_END,
};

/* All supported SPOE actions */
enum spoe_action_type {
	SPOE_ACT_T_SET_VAR = 1,
	SPOE_ACT_T_UNSET_VAR,
	SPOE_ACT_TYPES,
};

/* All supported SPOE events */
enum spoe_event {
	SPOE_EV_NONE = 0,

	/* Request events */
	SPOE_EV_ON_CLIENT_SESS = 1,
	SPOE_EV_ON_TCP_REQ_FE,
	SPOE_EV_ON_TCP_REQ_BE,
	SPOE_EV_ON_HTTP_REQ_FE,
	SPOE_EV_ON_HTTP_REQ_BE,

	/* Response events */
	SPOE_EV_ON_SERVER_SESS,
	SPOE_EV_ON_TCP_RSP,
	SPOE_EV_ON_HTTP_RSP,

	SPOE_EV_EVENTS
};

/* Errors triggerd by SPOE applet */
enum spoe_frame_error {
	SPOE_FRM_ERR_NONE = 0,
	SPOE_FRM_ERR_IO,
	SPOE_FRM_ERR_TOUT,
	SPOE_FRM_ERR_TOO_BIG,
	SPOE_FRM_ERR_INVALID,
	SPOE_FRM_ERR_NO_VSN,
	SPOE_FRM_ERR_NO_FRAME_SIZE,
	SPOE_FRM_ERR_NO_CAP,
	SPOE_FRM_ERR_BAD_VSN,
	SPOE_FRM_ERR_BAD_FRAME_SIZE,
	SPOE_FRM_ERR_UNKNOWN = 99,
	SPOE_FRM_ERRS,
};

/* Scopes used for variables set by agents. It is a way to be agnotic to vars
 * scope. */
enum spoe_vars_scope {
	SPOE_SCOPE_PROC = 0, /* <=> SCOPE_PROC  */
	SPOE_SCOPE_SESS,     /* <=> SCOPE_SESS */
	SPOE_SCOPE_TXN,      /* <=> SCOPE_TXN  */
	SPOE_SCOPE_REQ,      /* <=> SCOPE_REQ  */
	SPOE_SCOPE_RES,      /* <=> SCOPE_RES  */
};


/* Describe an argument that will be linked to a message. It is a sample fetch,
 * with an optional name. */
struct spoe_arg {
	char               *name;     /* Name of the argument, may be NULL */
	unsigned int        name_len; /* The name length, 0 if NULL */
	struct sample_expr *expr;     /* Sample expression */
	struct list         list;     /* Used to chain SPOE args */
};

/* Used during the config parsing only because, when a SPOE agent section is
 * parsed, messages can be undefined. */
struct spoe_msg_placeholder {
	char       *id;    /* SPOE message placeholder id */
	struct list list;  /* Use to chain SPOE message placeholders */
};

/* Describe a message that will be sent in a NOTIFY frame. A message has a name,
 * an argument list (see above) and it is linked to a specific event. */
struct spoe_message {
	char             *id;      /* SPOE message id */
	unsigned int      id_len;  /* The message id length */
	struct spoe_agent *agent;   /* SPOE agent owning this SPOE message */
        struct {
                char     *file;    /* file where the SPOE message appears */
                int       line;    /* line where the SPOE message appears */
        } conf;                    /* config information */
	struct list       args;    /* Arguments added when the SPOE messages is sent */
	struct list       list;    /* Used to chain SPOE messages */

	enum spoe_event    event;   /* SPOE_EV_* */
};

/* Describe a SPOE agent. */
struct spoe_agent {
	char                 *id;             /* SPOE agent id (name) */
        struct {
                char         *file;           /* file where the SPOE agent appears */
                int           line;           /* line where the SPOE agent appears */
        } conf;                               /* config information */
	union {
		struct proxy *be;             /* Backend used by this agent */
		char         *name;           /* Backend name used during conf parsing */
	} b;
	struct {
		unsigned int  hello;          /* Max time to receive AGENT-HELLO frame */
		unsigned int  idle;           /* Max Idle timeout */
		unsigned int  ack;            /* Max time to acknowledge a NOTIFY frame */
	} timeout;

	char                 *var_pfx;        /* Prefix used for vars set by the agent */

	struct list           cache;          /* List used to cache SPOE streams. In
					       * fact, we cache the SPOE applect ctx */

	struct list messages[SPOE_EV_EVENTS]; /* List of SPOE messages that will be sent
					       * for each supported events */

	struct list        applet_wq;         /* List of streams waiting for a SPOE applet */
	unsigned int       new_applets;       /* The number of new SPOE applets */
};

/* SPOE filter configuration */
struct spoe_config {
	struct proxy      *proxy;       /* Proxy owning the filter */
	struct spoe_agent *agent;       /* Agent used by this filter */
	struct proxy       agent_fe;    /* Agent frontend */
};

/* SPOE context attached to a stream. It is the main structure that handles the
 * processing offload */
struct spoe_context {
	struct filter      *filter;       /* The SPOE filter */
	struct stream      *strm;         /* The stream that should be offloaded */
	struct appctx      *appctx;       /* The SPOE appctx */
	struct list        *messages;     /* List of messages that will be sent during the stream processing */
	struct buffer      *buffer;       /* Buffer used to store a NOTIFY or ACK frame */
	struct list         buffer_wait;  /* position in the list of streams waiting for a buffer */
	struct list         applet_wait;  /* position in the list of streams waiting for a SPOE applet */

	unsigned int        errs;         /* The number of errors to acquire a SPOE applet */

	enum spoe_ctx_state state;        /* SPOE_CTX_ST_* */
	unsigned int        flags;        /* SPOE_CTX_FL_* */

	unsigned int        stream_id;    /* stream_id and frame_id are used */
	unsigned int        frame_id;     /* to map NOTIFY and ACK frames */

};

/* Set if the handle on SIGUSR1 is registered */
static int sighandler_registered = 0;

/* proxy used during the parsing */
struct proxy *curproxy = NULL;

/* The name of the SPOE engine, used during the parsing */
char *curengine = NULL;

/* SPOE agent used during the parsing */
struct spoe_agent *curagent = NULL;

/* SPOE message used during the parsing */
struct spoe_message *curmsg = NULL;

/* list of SPOE messages and placeholders used during the parsing */
struct list curmsgs;
struct list curmps;

/* Pool used to allocate new SPOE contexts */
static struct pool_head *pool2_spoe_ctx = NULL;

/* Temporary variables used to ease error processing */
int  spoe_status_code = SPOE_FRM_ERR_NONE;
char spoe_reason[256];

struct flt_ops spoe_ops;

static void offer_spoe_appctx(struct spoe_agent *agent, struct appctx *appctx);
static void on_new_spoe_appctx_failure(struct spoe_agent *agent);
static void on_new_spoe_appctx_success(struct spoe_agent *agent, struct appctx *appctx);

/********************************************************************
 * helper functions/globals
 ********************************************************************/
static void
release_spoe_msg_placeholder(struct spoe_msg_placeholder *mp)
{
	if (!mp)
		return;
	free(mp->id);
	free(mp);
}


static void
release_spoe_message(struct spoe_message *msg)
{
	struct spoe_arg *arg, *back;

	if (!msg)
		return;
	free(msg->id);
	free(msg->conf.file);
	list_for_each_entry_safe(arg, back, &msg->args, list) {
		release_sample_expr(arg->expr);
		free(arg->name);
		LIST_DEL(&arg->list);
		free(arg);
	}
	free(msg);
}

static void
release_spoe_agent(struct spoe_agent *agent)
{
	struct spoe_message *msg, *back;
	int                  i;

	if (!agent)
		return;
	free(agent->id);
	free(agent->conf.file);
	free(agent->var_pfx);
	for (i = 0; i < SPOE_EV_EVENTS; ++i) {
		list_for_each_entry_safe(msg, back, &agent->messages[i], list) {
			LIST_DEL(&msg->list);
			release_spoe_message(msg);
		}
	}
	free(agent);
}

static const char *spoe_frm_err_reasons[SPOE_FRM_ERRS] = {
	[SPOE_FRM_ERR_NONE]           = "normal",
	[SPOE_FRM_ERR_IO]             = "I/O error",
	[SPOE_FRM_ERR_TOUT]           = "a timeout occurred",
	[SPOE_FRM_ERR_TOO_BIG]        = "frame is too big",
	[SPOE_FRM_ERR_INVALID]        = "invalid frame received",
	[SPOE_FRM_ERR_NO_VSN]         = "version value not found",
	[SPOE_FRM_ERR_NO_FRAME_SIZE]  = "max-frame-size value not found",
	[SPOE_FRM_ERR_NO_CAP]         = "capabilities value not found",
	[SPOE_FRM_ERR_BAD_VSN]        = "unsupported version",
	[SPOE_FRM_ERR_BAD_FRAME_SIZE] = "max-frame-size too big or too small",
	[SPOE_FRM_ERR_UNKNOWN]        = "an unknown error occurred",
};

static const char *spoe_event_str[SPOE_EV_EVENTS] = {
	[SPOE_EV_ON_CLIENT_SESS] = "on-client-session",
	[SPOE_EV_ON_TCP_REQ_FE]  = "on-frontend-tcp-request",
	[SPOE_EV_ON_TCP_REQ_BE]  = "on-backend-tcp-request",
	[SPOE_EV_ON_HTTP_REQ_FE] = "on-frontend-http-request",
	[SPOE_EV_ON_HTTP_REQ_BE] = "on-backend-http-request",

	[SPOE_EV_ON_SERVER_SESS] = "on-server-session",
	[SPOE_EV_ON_TCP_RSP]     = "on-tcp-response",
	[SPOE_EV_ON_HTTP_RSP]    = "on-http-response",
};


#if defined(DEBUG_SPOE) || defined(DEBUG_FULL)

static const char *spoe_ctx_state_str[SPOE_CTX_ST_ERROR+1] = {
	[SPOE_CTX_ST_NONE]         = "NONE",
	[SPOE_CTX_ST_READY]        = "READY",
	[SPOE_CTX_ST_SENDING_MSGS] = "SENDING_MSGS",
	[SPOE_CTX_ST_WAITING_ACK]  = "WAITING_ACK",
	[SPOE_CTX_ST_DONE]         = "DONE",
	[SPOE_CTX_ST_ERROR]        = "ERROR",
};

static const char *spoe_appctx_state_str[SPOE_APPCTX_ST_END+1] = {
	[SPOE_APPCTX_ST_CONNECT]       = "CONNECT",
	[SPOE_APPCTX_ST_CONNECTING]    = "CONNECTING",
	[SPOE_APPCTX_ST_PROCESSING]    = "PROCESSING",
	[SPOE_APPCTX_ST_DISCONNECT]    = "DISCONNECT",
	[SPOE_APPCTX_ST_DISCONNECTING] = "DISCONNECTING",
	[SPOE_APPCTX_ST_EXIT]          = "EXIT",
	[SPOE_APPCTX_ST_END]           = "END",
};

#endif
/********************************************************************
 * Functions that encode/decode SPOE frames
 ********************************************************************/
/* Frame Types sent by HAProxy and by agents */
enum spoe_frame_type {
	/* Frames sent by HAProxy */
	SPOE_FRM_T_HAPROXY_HELLO = 1,
	SPOE_FRM_T_HAPROXY_DISCON,
	SPOE_FRM_T_HAPROXY_NOTIFY,

	/* Frames sent by the agents */
	SPOE_FRM_T_AGENT_HELLO = 101,
	SPOE_FRM_T_AGENT_DISCON,
	SPOE_FRM_T_AGENT_ACK
};

/* All supported data types */
enum spoe_data_type {
	SPOE_DATA_T_NULL = 0,
	SPOE_DATA_T_BOOL,
	SPOE_DATA_T_INT32,
	SPOE_DATA_T_UINT32,
	SPOE_DATA_T_INT64,
	SPOE_DATA_T_UINT64,
	SPOE_DATA_T_IPV4,
	SPOE_DATA_T_IPV6,
	SPOE_DATA_T_STR,
	SPOE_DATA_T_BIN,
	SPOE_DATA_TYPES
};

/* Masks to get data type or flags value */
#define SPOE_DATA_T_MASK  0x0F
#define SPOE_DATA_FL_MASK 0xF0

/* Flags to set Boolean values */
#define SPOE_DATA_FL_FALSE 0x00
#define SPOE_DATA_FL_TRUE  0x10

/* Helper to get static string length, excluding the terminating null byte */
#define SLEN(str) (sizeof(str)-1)

/* Predefined key used in HELLO/DISCONNECT frames */
#define SUPPORTED_VERSIONS_KEY     "supported-versions"
#define VERSION_KEY                "version"
#define MAX_FRAME_SIZE_KEY         "max-frame-size"
#define CAPABILITIES_KEY           "capabilities"
#define STATUS_CODE_KEY            "status-code"
#define MSG_KEY                    "message"

struct spoe_version {
	char *str;
	int   min;
	int   max;
};

/* All supported versions */
static struct spoe_version supported_versions[] = {
	{"1.0", 1000, 1000},
	{NULL,  0, 0}
};

/* Comma-separated list of supported versions */
#define SUPPORTED_VERSIONS_VAL  "1.0"

/* Comma-separated list of supported capabilities (none for now) */
#define CAPABILITIES_VAL ""

static int
decode_spoe_version(const char *str, size_t len)
{
	char   tmp[len+1], *start, *end;
	double d;
	int    vsn = -1;

	memset(tmp, 0, len+1);
	memcpy(tmp, str, len);

	start = tmp;
	while (isspace(*start))
		start++;

	d = strtod(start, &end);
	if (d == 0 || start == end)
		goto out;

	if (*end) {
		while (isspace(*end))
			end++;
		if (*end)
			goto out;
	}
	vsn = (int)(d * 1000);
  out:
	return vsn;
}

/* Encode a variable-length integer. This function never fails and returns the
 * number of written bytes. */
static int
encode_spoe_varint(uint64_t i, char *buf)
{
	int idx;

	if (i < 240) {
		buf[0] = (unsigned char)i;
		return 1;
	}

	buf[0] = (unsigned char)i | 240;
	i = (i - 240) >> 4;
	for (idx = 1; i >= 128; ++idx) {
		buf[idx] = (unsigned char)i | 128;
		i = (i - 128) >> 7;
	}
	buf[idx++] = (unsigned char)i;
	return idx;
}

/* Decode a varable-length integer. If the decoding fails, -1 is returned. This
 * happens when the buffer's end in reached. On success, the number of read
 * bytes is returned. */
static int
decode_spoe_varint(const char *buf, const char *end, uint64_t *i)
{
	unsigned char *msg = (unsigned char *)buf;
	int            idx = 0;

	if (msg > (unsigned char *)end)
		return -1;

	if (msg[0] < 240) {
		*i = msg[0];
		return 1;
	}
	*i = msg[0];
	do {
		++idx;
		if (msg+idx > (unsigned char *)end)
			return -1;
		*i += (uint64_t)msg[idx] <<  (4 + 7 * (idx-1));
	} while (msg[idx] >= 128);
	return (idx + 1);
}

/* Encode a string. The string will be prefix by its length, encoded as a
 * variable-length integer. This function never fails and returns the number of
 * written bytes. */
static int
encode_spoe_string(const char *str, size_t len, char *dst)
{
	int idx = 0;

	if (!len) {
		dst[0] = 0;
		return 1;
	}

	idx += encode_spoe_varint(len, dst);
	memcpy(dst+idx, str, len);
	return (idx + len);
}

/* Decode a string. Its length is decoded first as a variable-length integer. If
 * it succeeds, and if the string length is valid, the begin of the string is
 * saved in <*str>, its length is saved in <*len> and the total numbre of bytes
 * read is returned. If an error occurred, -1 is returned and <*str> remains
 * NULL. */
static int
decode_spoe_string(char *buf, char *end, char **str, uint64_t *len)
{
	int i, idx = 0;

	*str = NULL;
	*len = 0;

	if ((i = decode_spoe_varint(buf, end, len)) == -1)
		goto error;
	idx += i;
	if (buf + idx + *len > end)
		goto error;

	*str = buf+idx;
	return (idx + *len);

  error:
	return -1;
}

/* Skip a typed data. If an error occurred, -1 is returned, otherwise the number
 * of bytes read is returned. A types data is composed of a type (1 byte) and
 * corresponding data:
 *  - boolean: non additional data (0 bytes)
 *  - integers: a variable-length integer (see decode_spoe_varint)
 *  - ipv4: 4 bytes
 *  - ipv6: 16 bytes
 *  - binary and string: a buffer prefixed by its size, a variable-length
 *    integer (see decode_spoe_string) */
static int
skip_spoe_data(char *frame, char *end)
{
	uint64_t sz = 0;
	int      i, idx = 0;

	if (frame > end)
		return -1;

	switch (frame[idx++] & SPOE_DATA_T_MASK) {
		case SPOE_DATA_T_BOOL:
			break;
		case SPOE_DATA_T_INT32:
		case SPOE_DATA_T_INT64:
		case SPOE_DATA_T_UINT32:
		case SPOE_DATA_T_UINT64:
			if ((i = decode_spoe_varint(frame+idx, end, &sz)) == -1)
				return -1;
			idx += i;
			break;
		case SPOE_DATA_T_IPV4:
			idx += 4;
			break;
		case SPOE_DATA_T_IPV6:
			idx += 16;
			break;
		case SPOE_DATA_T_STR:
		case SPOE_DATA_T_BIN:
			if ((i = decode_spoe_varint(frame+idx, end, &sz)) == -1)
				return -1;
			idx += i + sz;
			break;
	}

	if (frame+idx > end)
		return -1;
	return idx;
}

/* Decode a typed data. If an error occurred, -1 is returned, otherwise the
 * number of read bytes is returned. See skip_spoe_data for details. */
static int
decode_spoe_data(char *frame, char *end, struct sample *smp)
{
	uint64_t sz = 0;
	int      type, i, idx = 0;

	if (frame > end)
		return -1;

	type = frame[idx++];
	switch (type & SPOE_DATA_T_MASK) {
		case SPOE_DATA_T_BOOL:
			smp->data.u.sint = ((type & SPOE_DATA_FL_TRUE) == SPOE_DATA_FL_TRUE);
			smp->data.type = SMP_T_BOOL;
			break;
		case SPOE_DATA_T_INT32:
		case SPOE_DATA_T_INT64:
		case SPOE_DATA_T_UINT32:
		case SPOE_DATA_T_UINT64:
			if ((i = decode_spoe_varint(frame+idx, end, (uint64_t *)&smp->data.u.sint)) == -1)
				return -1;
			idx += i;
			smp->data.type = SMP_T_SINT;
			break;
		case SPOE_DATA_T_IPV4:
			if (frame+idx+4 > end)
				return -1;
			memcpy(&smp->data.u.ipv4, frame+idx, 4);
			smp->data.type = SMP_T_IPV4;
			idx += 4;
			break;
		case SPOE_DATA_T_IPV6:
			if (frame+idx+16 > end)
				return -1;
			memcpy(&smp->data.u.ipv6, frame+idx, 16);
			smp->data.type = SMP_T_IPV6;
			idx += 16;
			break;
		case SPOE_DATA_T_STR:
			if ((i = decode_spoe_varint(frame+idx, end, &sz)) == -1)
				return -1;
			idx += i;
			if (frame+idx+sz > end)
				return -1;
			smp->data.u.str.str = frame+idx;
			smp->data.u.str.len = sz;
			smp->data.type = SMP_T_STR;
			idx += sz;
			break;
		case SPOE_DATA_T_BIN:
			if ((i = decode_spoe_varint(frame+idx, end, &sz)) == -1)
				return -1;
			idx += i;
			if (frame+idx+sz > end)
				return -1;
			smp->data.u.str.str = frame+idx;
			smp->data.u.str.len = sz;
			smp->data.type = SMP_T_BIN;
			idx += sz;
			break;
	}

	if (frame+idx > end)
		return -1;
	return idx;
}

/* Skip an action in a frame received from an agent. If an error occurred, -1 is
 * returned, otherwise the number of read bytes is returned. An action is
 * composed of the action type followed by a typed data. */
static int
skip_spoe_action(char *frame, char *end)
{
	int n, i, idx = 0;

	if (frame+2 > end)
		return -1;

	idx++; /* Skip the action type */
	n = frame[idx++];
	while (n-- > 0) {
		if ((i = skip_spoe_data(frame+idx, end)) == -1)
			return -1;
		idx += i;
	}

	if (frame+idx > end)
		return -1;
	return idx;
}

/* Encode HELLO frame sent by HAProxy to an agent. It returns the frame size on
 * success, 0 if the frame can be ignored and -1 if an error occurred. */
static int
prepare_spoe_hahello_frame(struct appctx *appctx, char *frame, size_t size)
{
	int      idx = 0;
	size_t   max = (7   /* TYPE + METADATA */
			+ 1 + SLEN(SUPPORTED_VERSIONS_KEY) + 1 + 1 + SLEN(SUPPORTED_VERSIONS_VAL)
			+ 1 + SLEN(MAX_FRAME_SIZE_KEY) + 1 + 4
			+ 1 + SLEN(CAPABILITIES_KEY) + 1 + 1 + SLEN(CAPABILITIES_VAL));

	if (size < max)
		return -1;

	/* Frame type */
	frame[idx++] = SPOE_FRM_T_HAPROXY_HELLO;

	/* No flags for now */
	memset(frame+idx, 0, 4);
	idx += 4;

	/* No stream-id and frame-id for HELLO frames */
	frame[idx++] = 0;
	frame[idx++] = 0;

	/* There are 3 mandatory items: "supported-versions", "max-frame-size"
	 * and "capabilities" */

	/* "supported-versions" K/V item */
	idx += encode_spoe_string(SUPPORTED_VERSIONS_KEY, SLEN(SUPPORTED_VERSIONS_KEY), frame+idx);
	frame[idx++] = SPOE_DATA_T_STR;
	idx += encode_spoe_string(SUPPORTED_VERSIONS_VAL, SLEN(SUPPORTED_VERSIONS_VAL), frame+idx);

	/* "max-fram-size" K/V item */
	idx += encode_spoe_string(MAX_FRAME_SIZE_KEY, SLEN(MAX_FRAME_SIZE_KEY), frame+idx);
	frame[idx++] = SPOE_DATA_T_UINT32;
	idx += encode_spoe_varint(APPCTX_SPOE(appctx).max_frame_size, frame+idx);

	/* "capabilities" K/V item */
	idx += encode_spoe_string(CAPABILITIES_KEY, SLEN(CAPABILITIES_KEY), frame+idx);
	frame[idx++] = SPOE_DATA_T_STR;
	idx += encode_spoe_string(CAPABILITIES_VAL, SLEN(CAPABILITIES_VAL), frame+idx);

	return idx;
}

/* Encode DISCONNECT frame sent by HAProxy to an agent. It returns the frame
 * size on success, 0 if the frame can be ignored and -1 if an error
 * occurred. */
static int
prepare_spoe_hadiscon_frame(struct appctx *appctx, char *frame, size_t size)
{
	const char *reason;
	int         rlen, idx = 0;
	size_t      max = (7   /* TYPE + METADATA */
			   + 1 + SLEN(STATUS_CODE_KEY) + 1 + 2
			   + 1 + SLEN(MSG_KEY) + 1 + 2 + 255);

	if (size < max)
		return -1;

	/* Get the message corresponding to the status code */
	if (spoe_status_code >= SPOE_FRM_ERRS)
		spoe_status_code = SPOE_FRM_ERR_UNKNOWN;
	reason = spoe_frm_err_reasons[spoe_status_code];
	rlen   = strlen(reason);

	 /* Frame type */
	frame[idx++] = SPOE_FRM_T_HAPROXY_DISCON;

	/* No flags for now */
	memset(frame+idx, 0, 4);
	idx += 4;

	/* No stream-id and frame-id for DISCONNECT frames */
	frame[idx++] = 0;
	frame[idx++] = 0;

	/* There are 2 mandatory items: "status-code" and "message" */

	/* "status-code" K/V item */
	idx += encode_spoe_string(STATUS_CODE_KEY, SLEN(STATUS_CODE_KEY), frame+idx);
	frame[idx++] = SPOE_DATA_T_UINT32;
	idx += encode_spoe_varint(spoe_status_code, frame+idx);

	/* "message" K/V item */
	idx += encode_spoe_string(MSG_KEY, SLEN(MSG_KEY), frame+idx);
	frame[idx++] = SPOE_DATA_T_STR;
	idx += encode_spoe_string(reason, rlen, frame+idx);

	return idx;
}

/* Encode NOTIFY frame sent by HAProxy to an agent. It returns the frame size on
 * success, 0 if the frame can be ignored and -1 if an error occurred. */
static int
prepare_spoe_hanotify_frame(struct appctx *appctx, char *frame, size_t size)
{
	struct spoe_context *ctx = APPCTX_SPOE(appctx).ctx;
	int                  idx = 0;

	if (size < APPCTX_SPOE(appctx).max_frame_size)
		return -1;

	frame[idx++] = SPOE_FRM_T_HAPROXY_NOTIFY;

	/* No flags for now */
	memset(frame+idx, 0, 4);
	idx += 4;

	/* Set stream-id and frame-id */
	idx += encode_spoe_varint(ctx->stream_id, frame+idx);
	idx += encode_spoe_varint(ctx->frame_id, frame+idx);

	/* Copy encoded messages */
	memcpy(frame+idx, ctx->buffer->p, ctx->buffer->i);
	idx += ctx->buffer->i;

	return idx;
}

/* Decode HELLO frame sent by an agent. It returns the number of by read bytes
 * on success, 0 if the frame can be ignored and -1 if an error occurred. */
static int
handle_spoe_agenthello_frame(struct appctx *appctx, char *frame, size_t size)
{
	int    vsn, max_frame_size;
	int    i, idx = 0;
	size_t min_size = (7   /* TYPE + METADATA */
			   + 1 + SLEN(VERSION_KEY) + 1 + 1 + 3
			   + 1 + SLEN(MAX_FRAME_SIZE_KEY) + 1 + 1
			   + 1 + SLEN(CAPABILITIES_KEY) + 1 + 1 + 0);

	/* Check frame type */
	if (frame[idx++] != SPOE_FRM_T_AGENT_HELLO)
		return 0;

	if (size < min_size) {
		spoe_status_code = SPOE_FRM_ERR_INVALID;
		return -1;
	}

	/* Skip flags: fragmentation is not supported for now */
	idx += 4;

	/* stream-id and frame-id must be cleared */
	if (frame[idx] != 0 || frame[idx+1] != 0) {
		spoe_status_code = SPOE_FRM_ERR_INVALID;
		return -1;
	}
	idx += 2;

	/* There are 3 mandatory items: "version", "max-frame-size" and
	 * "capabilities" */

	/* Loop on K/V items */
	vsn = max_frame_size = 0;
	while (idx < size) {
		char     *str;
		uint64_t  sz;

		/* Decode the item key */
		idx += decode_spoe_string(frame+idx, frame+size, &str, &sz);
		if (str == NULL) {
			spoe_status_code = SPOE_FRM_ERR_INVALID;
			return -1;
		}
		/* Check "version" K/V item */
		if (!memcmp(str, VERSION_KEY, sz)) {
			/* The value must be a string */
			if ((frame[idx++] & SPOE_DATA_T_MASK) != SPOE_DATA_T_STR) {
				spoe_status_code = SPOE_FRM_ERR_INVALID;
				return -1;
			}
			idx += decode_spoe_string(frame+idx, frame+size, &str, &sz);
			if (str == NULL) {
				spoe_status_code = SPOE_FRM_ERR_INVALID;
				return -1;
			}

			vsn = decode_spoe_version(str, sz);
			if (vsn == -1) {
				spoe_status_code = SPOE_FRM_ERR_BAD_VSN;
				return -1;
			}
			for (i = 0; supported_versions[i].str != NULL; ++i) {
				if (vsn >= supported_versions[i].min &&
				    vsn <= supported_versions[i].max)
					break;
			}
			if (supported_versions[i].str == NULL) {
				spoe_status_code = SPOE_FRM_ERR_BAD_VSN;
				return -1;
			}
		}
		/* Check "max-frame-size" K/V item */
		else if (!memcmp(str, MAX_FRAME_SIZE_KEY, sz)) {
			int type;

			/* The value must be integer */
			type = frame[idx++];
			if ((type & SPOE_DATA_T_MASK) != SPOE_DATA_T_INT32 &&
			    (type & SPOE_DATA_T_MASK) != SPOE_DATA_T_INT64 &&
			    (type & SPOE_DATA_T_MASK) != SPOE_DATA_T_UINT32 &&
			    (type & SPOE_DATA_T_MASK) != SPOE_DATA_T_UINT64) {
				spoe_status_code = SPOE_FRM_ERR_INVALID;
				return -1;
			}
			if ((i = decode_spoe_varint(frame+idx, frame+size, &sz)) == -1) {
				spoe_status_code = SPOE_FRM_ERR_INVALID;
				return -1;
			}
			idx += i;
			if (sz < MIN_FRAME_SIZE || sz > APPCTX_SPOE(appctx).max_frame_size) {
				spoe_status_code = SPOE_FRM_ERR_BAD_FRAME_SIZE;
				return -1;
			}
			max_frame_size = sz;
		}
		/* Skip "capabilities" K/V item for now */
		else {
			/* Silently ignore unknown item */
			if ((i = skip_spoe_data(frame+idx, frame+size)) == -1) {
				spoe_status_code = SPOE_FRM_ERR_INVALID;
				return -1;
			}
			idx += i;
		}
	}

	/* Final checks */
	if (!vsn) {
		spoe_status_code = SPOE_FRM_ERR_NO_VSN;
		return -1;
	}
	if (!max_frame_size) {
		spoe_status_code = SPOE_FRM_ERR_NO_FRAME_SIZE;
		return -1;
	}

	APPCTX_SPOE(appctx).version        = (unsigned int)vsn;
	APPCTX_SPOE(appctx).max_frame_size = (unsigned int)max_frame_size;
	return idx;
}

/* Decode DISCONNECT frame sent by an agent. It returns the number of by read
 * bytes on success, 0 if the frame can be ignored and -1 if an error
 * occurred. */
static int
handle_spoe_agentdiscon_frame(struct appctx *appctx, char *frame, size_t size)
{
	int    i, idx = 0;
	size_t min_size = (7   /* TYPE + METADATA */
			   + 1 + SLEN(STATUS_CODE_KEY) + 1 + 1
			   + 1 + SLEN(MSG_KEY) + 1 + 1);

	/* Check frame type */
	if (frame[idx++] != SPOE_FRM_T_AGENT_DISCON)
		return 0;

	if (size < min_size) {
		spoe_status_code = SPOE_FRM_ERR_INVALID;
		return -1;
	}

	/* Skip flags: fragmentation is not supported for now */
	idx += 4;

	/* stream-id and frame-id must be cleared */
	if (frame[idx] != 0 || frame[idx+1] != 0) {
		spoe_status_code = SPOE_FRM_ERR_INVALID;
		return -1;
	}
	idx += 2;

	/* There are 2 mandatory items: "status-code" and "message" */

	/* Loop on K/V items */
	while (idx < size) {
		char     *str;
		uint64_t  sz;

		/* Decode the item key */
		idx += decode_spoe_string(frame+idx, frame+size, &str, &sz);
		if (str == NULL) {
			spoe_status_code = SPOE_FRM_ERR_INVALID;
			return -1;
		}

		/* Check "status-code" K/V item */
		if (!memcmp(str, STATUS_CODE_KEY, sz)) {
			int type;

			/* The value must be an integer */
			type = frame[idx++];
			if ((type & SPOE_DATA_T_MASK) != SPOE_DATA_T_INT32 &&
			    (type & SPOE_DATA_T_MASK) != SPOE_DATA_T_INT64 &&
			    (type & SPOE_DATA_T_MASK) != SPOE_DATA_T_UINT32 &&
			    (type & SPOE_DATA_T_MASK) != SPOE_DATA_T_UINT64) {
				spoe_status_code = SPOE_FRM_ERR_INVALID;
				return -1;
			}
			if ((i = decode_spoe_varint(frame+idx, frame+size, &sz)) == -1) {
				spoe_status_code = SPOE_FRM_ERR_INVALID;
				return -1;
			}
			idx += i;
			spoe_status_code = sz;
		}

		/* Check "message" K/V item */
		else if (sz && !memcmp(str, MSG_KEY, sz)) {
			/* The value must be a string */
			if ((frame[idx++] & SPOE_DATA_T_MASK) != SPOE_DATA_T_STR) {
				spoe_status_code = SPOE_FRM_ERR_INVALID;
				return -1;
			}
			idx += decode_spoe_string(frame+idx, frame+size, &str, &sz);
			if (str == NULL || sz > 255) {
				spoe_status_code = SPOE_FRM_ERR_INVALID;
				return -1;
			}
			memcpy(spoe_reason, str, sz);
			spoe_reason[sz] = 0;
		}
		else {
			/* Silently ignore unknown item */
			if ((i = skip_spoe_data(frame+idx, frame+size)) == -1) {
				spoe_status_code = SPOE_FRM_ERR_INVALID;
				return -1;
			}
			idx += i;
		}
	}

	return idx;
}


/* Decode ACK frame sent by an agent. It returns the number of by read bytes on
 * success, 0 if the frame can be ignored and -1 if an error occurred. */
static int
handle_spoe_agentack_frame(struct appctx *appctx, char *frame, size_t size)
{
	struct spoe_context  *ctx = APPCTX_SPOE(appctx).ctx;
	uint64_t              stream_id, frame_id;
	int                   idx = 0;
	size_t                min_size = (7  /* TYPE + METADATA */);

	/* Check frame type */
	if (frame[idx++] != SPOE_FRM_T_AGENT_ACK)
		return 0;

	if (size < min_size) {
		spoe_status_code = SPOE_FRM_ERR_INVALID;
		return -1;
	}

	/* Skip flags: fragmentation is not supported for now */
	idx += 4;

	/* Get the stream-id and the frame-id */
	idx += decode_spoe_varint(frame+idx, frame+size, &stream_id);
	idx += decode_spoe_varint(frame+idx, frame+size, &frame_id);

	/* Check stream-id and frame-id */
	if (ctx->stream_id != (unsigned int)stream_id ||
	    ctx->frame_id  != (unsigned int)frame_id)
		return 0;

	/* Copy encoded actions */
	b_reset(ctx->buffer);
	memcpy(ctx->buffer->p, frame+idx, size-idx);
	ctx->buffer->i = size-idx;

	return idx;
}


/********************************************************************
 * Functions that manage the SPOE applet
 ********************************************************************/
/* Callback function that catches applet timeouts. If a timeout occurred, we set
 * <appctx->st1> flag and the SPOE applet is woken up. */
static struct task *
process_spoe_applet(struct task * task)
{
	struct appctx *appctx = task->context;

	appctx->st1 = SPOE_APPCTX_ERR_NONE;
	if (tick_is_expired(task->expire, now_ms)) {
		task->expire = TICK_ETERNITY;
		appctx->st1 = SPOE_APPCTX_ERR_TOUT;
	}
	si_applet_want_get(appctx->owner);
	appctx_wakeup(appctx);
	return task;
}

/* Remove a SPOE applet from the agent cache */
static void
remove_spoe_applet_from_cache(struct appctx *appctx)
{
	struct appctx     *a, *back;
	struct spoe_agent *agent = APPCTX_SPOE(appctx).agent;

	if (LIST_ISEMPTY(&agent->cache))
		return;

	list_for_each_entry_safe(a, back, &agent->cache, ctx.spoe.list) {
		if (a == appctx) {
			LIST_DEL(&APPCTX_SPOE(appctx).list);
			break;
		}
	}
}


/* Callback function that releases a SPOE applet. This happens when the
 * connection with the agent is closed. */
static void
release_spoe_applet(struct appctx *appctx)
{
	struct stream_interface *si    = appctx->owner;
	struct spoe_agent       *agent = APPCTX_SPOE(appctx).agent;
	struct spoe_context     *ctx   = APPCTX_SPOE(appctx).ctx;

	if (appctx->st0 == SPOE_APPCTX_ST_CONNECT ||
	    appctx->st0 == SPOE_APPCTX_ST_CONNECTING)
		on_new_spoe_appctx_failure(agent);

	if (appctx->st0 != SPOE_APPCTX_ST_END) {
		si_shutw(si);
		si_shutr(si);
		si_ic(si)->flags |= CF_READ_NULL;
		appctx->st0 = SPOE_APPCTX_ST_END;
	}

	if (ctx != NULL) {
		task_wakeup(ctx->strm->task, TASK_WOKEN_MSG);
		ctx->appctx = NULL;
	}

	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: appctx=%p\n",
		    (int)now.tv_sec, (int)now.tv_usec, agent->id,
		    __FUNCTION__, appctx);

	/* Release the task attached to the SPOE applet */
	if (APPCTX_SPOE(appctx).task) {
		task_delete(APPCTX_SPOE(appctx).task);
		task_free(APPCTX_SPOE(appctx).task);
	}

	/* And remove it from the agent cache */
	remove_spoe_applet_from_cache(appctx);
	APPCTX_SPOE(appctx).ctx = NULL;
}

/* Send a SPOE frame to an agent. It return -2 when an error occurred, -1 when
 * the frame can be ignored, 0 to retry later and 1 on success. The frame is
 * encoded using the callback function <prepare>. */
static int
send_spoe_frame(struct appctx *appctx,
		int (*prepare)(struct appctx *, char *, size_t))
{
	struct stream_interface *si  = appctx->owner;
	int                      framesz, ret;
	uint32_t                 netint;

	ret = prepare(appctx, trash.str, APPCTX_SPOE(appctx).max_frame_size);
	if (ret <= 0)
		goto skip_or_error;
	framesz = ret;
	netint  = htonl(framesz);
	ret = bi_putblk(si_ic(si), (char *)&netint, sizeof(netint));
	if (ret > 0)
		ret = bi_putblk(si_ic(si), trash.str, framesz);
	if (ret <= 0) {
		if (ret == -1)
			return -1;
		return -2;
	}
	return 1;

 skip_or_error:
	if (!ret)
		return -1;
	return -2;
}

/* Receive a SPOE frame from an agent. It return -2 when an error occurred, -1
 * when the frame can be ignored, 0 to retry later and 1 on success. The frame
 * is decoded using the callback function <handle>. */
static int
recv_spoe_frame(struct appctx *appctx,
		int (*handle)(struct appctx *, char *, size_t))
{
	struct stream_interface *si  = appctx->owner;
	int                      framesz, ret;
	uint32_t                 netint;

	ret = bo_getblk(si_oc(si), (char *)&netint, sizeof(netint), 0);
	if (ret <= 0)
		goto empty_or_error;
	framesz = ntohl(netint);
	if (framesz > APPCTX_SPOE(appctx).max_frame_size) {
		spoe_status_code = SPOE_FRM_ERR_TOO_BIG;
		return -2;
	}

	ret = bo_getblk(si_oc(si), trash.str, framesz, sizeof(netint));
	if (ret <= 0)
		goto empty_or_error;
	bo_skip(si_oc(si), ret+sizeof(netint));

	/* First check if the received frame is a DISCONNECT frame */
	ret = handle_spoe_agentdiscon_frame(appctx, trash.str, framesz);
	if (ret != 0) {
		if (ret > 0) {
			SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: appctx=%p"
				    " - disconnected by peer (%d): %s\n",
				    (int)now.tv_sec, (int)now.tv_usec,
				    ((struct spoe_agent *)APPCTX_SPOE(appctx).agent)->id,
				    __FUNCTION__, appctx, spoe_status_code,
				    spoe_reason);
			return 2;
		}
		SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: appctx=%p"
			    " - error on frame (%s)\n",
			    (int)now.tv_sec, (int)now.tv_usec,
			    ((struct spoe_agent *)APPCTX_SPOE(appctx).agent)->id,
			    __FUNCTION__, appctx,
			    spoe_frm_err_reasons[spoe_status_code]);
		return -2;
	}
	if (handle == NULL)
		goto out;

	/* If not, try to decode it */
	ret = handle(appctx, trash.str, framesz);
	if (ret <= 0) {
		if (!ret)
			return -1;
		SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: appctx=%p"
			    " - error on frame (%s)\n",
			    (int)now.tv_sec, (int)now.tv_usec,
			    ((struct spoe_agent *)APPCTX_SPOE(appctx).agent)->id,
			    __FUNCTION__, appctx,
			    spoe_frm_err_reasons[spoe_status_code]);
		return -2;
	}
  out:
	return 1;

  empty_or_error:
	if (!ret)
		return 0;
	spoe_status_code = SPOE_FRM_ERR_IO;
	return -2;
}

/* I/O Handler processing messages exchanged with the agent */
static void
handle_spoe_applet(struct appctx *appctx)
{
	struct stream_interface *si    = appctx->owner;
	struct stream           *s     = si_strm(si);
	struct spoe_agent       *agent = APPCTX_SPOE(appctx).agent;
	struct spoe_context     *ctx   = APPCTX_SPOE(appctx).ctx;
	int                      ret;

 switchstate:
	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: appctx=%p"
		    " - appctx-state=%s\n",
		    (int)now.tv_sec, (int)now.tv_usec, agent->id,
		    __FUNCTION__, appctx, spoe_appctx_state_str[appctx->st0]);

	switch (appctx->st0) {
		case SPOE_APPCTX_ST_CONNECT:
			spoe_status_code = SPOE_FRM_ERR_NONE;
			if (si->state <= SI_ST_CON) {
				si_applet_want_put(si);
				task_wakeup(s->task, TASK_WOKEN_MSG);
				break;
			}
			else if (si->state != SI_ST_EST) {
				appctx->st0 = SPOE_APPCTX_ST_EXIT;
				on_new_spoe_appctx_failure(agent);
				goto switchstate;
			}
			ret = send_spoe_frame(appctx, &prepare_spoe_hahello_frame);
			if (ret < 0) {
				appctx->st0 = SPOE_APPCTX_ST_EXIT;
				on_new_spoe_appctx_failure(agent);
				goto switchstate;
			}
			else if (!ret)
				goto full;

			/* Hello frame was sent. Set the hello timeout and
			 * wait for the reply. */
			APPCTX_SPOE(appctx).task->expire = tick_add_ifset(now_ms, agent->timeout.hello);
			appctx->st0 = SPOE_APPCTX_ST_CONNECTING;
			/* fall through */

		case SPOE_APPCTX_ST_CONNECTING:
			if (si->state == SI_ST_CLO || si_opposite(si)->state == SI_ST_CLO) {
				appctx->st0 = SPOE_APPCTX_ST_EXIT;
				on_new_spoe_appctx_failure(agent);
				goto switchstate;
			}
			if (appctx->st1 == SPOE_APPCTX_ERR_TOUT) {
				SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: appctx=%p"
					    " - Connection timed out\n",
					    (int)now.tv_sec, (int)now.tv_usec,
					    ((struct spoe_agent *)APPCTX_SPOE(appctx).agent)->id,
					    __FUNCTION__, appctx);
				appctx->st0 = SPOE_APPCTX_ST_EXIT;
				on_new_spoe_appctx_failure(agent);
				goto switchstate;
			}
			ret = recv_spoe_frame(appctx, &handle_spoe_agenthello_frame);
			if (ret < 0) {
				appctx->st0 = SPOE_APPCTX_ST_DISCONNECT;
				on_new_spoe_appctx_failure(agent);
				goto switchstate;
			}
			if (ret == 2) {
				appctx->st0 = SPOE_APPCTX_ST_EXIT;
				on_new_spoe_appctx_failure(agent);
				goto switchstate;
			}
			if (!ret)
				goto out;

			/* hello handshake is finished, set the idle timeout,
			 * Add the appctx in the agent cache, decrease the
			 * number of new applets and wake up waiting streams. */
			APPCTX_SPOE(appctx).task->expire = tick_add_ifset(now_ms, agent->timeout.idle);
			appctx->st0 = SPOE_APPCTX_ST_PROCESSING;
			on_new_spoe_appctx_success(agent, appctx);
			break;

		case SPOE_APPCTX_ST_PROCESSING:
			if (si->state == SI_ST_CLO || si_opposite(si)->state == SI_ST_CLO) {
				appctx->st0 = SPOE_APPCTX_ST_EXIT;
				goto switchstate;
			}
			if (appctx->st1 == SPOE_APPCTX_ERR_TOUT) {
				spoe_status_code = SPOE_FRM_ERR_TOUT;
				appctx->st0 = SPOE_APPCTX_ST_DISCONNECT;
				appctx->st1 = SPOE_APPCTX_ERR_NONE;
				goto switchstate;
			}
			if (ctx != NULL && ctx->state == SPOE_CTX_ST_SENDING_MSGS) {
				ret = send_spoe_frame(appctx, &prepare_spoe_hanotify_frame);
				if (ret < 0) {
					if (ret == -1) {
						ctx->state = SPOE_CTX_ST_ERROR;
						task_wakeup(ctx->strm->task, TASK_WOKEN_MSG);
						goto skip_notify_frame;
					}
					appctx->st0 = SPOE_APPCTX_ST_EXIT;
					goto switchstate;
				}
				else if (!ret)
					goto full;
				ctx->state = SPOE_CTX_ST_WAITING_ACK;
				APPCTX_SPOE(appctx).task->expire = tick_add_ifset(now_ms, agent->timeout.ack);
			}

		  skip_notify_frame:
			if (ctx != NULL && ctx->state == SPOE_CTX_ST_WAITING_ACK) {
				ret = recv_spoe_frame(appctx, &handle_spoe_agentack_frame);
				if (ret < 0) {
					if (ret == -1)
						goto skip_notify_frame;
					ctx->state = SPOE_CTX_ST_ERROR;
					task_wakeup(ctx->strm->task, TASK_WOKEN_MSG);
					appctx->st0 = SPOE_APPCTX_ST_DISCONNECT;
					goto switchstate;
				}
				if (!ret)
					goto out;
				if (ret == 2) {
					ctx->state = SPOE_CTX_ST_ERROR;
					task_wakeup(ctx->strm->task, TASK_WOKEN_MSG);
					appctx->st0 = SPOE_APPCTX_ST_EXIT;
					goto switchstate;
				}
				ctx->state = SPOE_CTX_ST_DONE;
				task_wakeup(ctx->strm->task, TASK_WOKEN_MSG);
				APPCTX_SPOE(appctx).task->expire = tick_add_ifset(now_ms, agent->timeout.idle);
			}
			else {
				if (stopping) {
					appctx->st0 = SPOE_APPCTX_ST_DISCONNECT;
					goto switchstate;
				}

				ret = recv_spoe_frame(appctx, NULL);
				if (ret < 0) {
					if (ret == -1)
						goto skip_notify_frame;
					appctx->st0 = SPOE_APPCTX_ST_DISCONNECT;
					goto switchstate;
				}
				if (!ret)
					goto out;
				if (ret == 2) {
					appctx->st0 = SPOE_APPCTX_ST_EXIT;
					goto switchstate;
				}
				APPCTX_SPOE(appctx).task->expire = tick_add_ifset(now_ms, agent->timeout.idle);
			}
			break;

		case SPOE_APPCTX_ST_DISCONNECT:
			ret = send_spoe_frame(appctx, &prepare_spoe_hadiscon_frame);
			if (ret < 0) {
				appctx->st0 = SPOE_APPCTX_ST_EXIT;
				goto switchstate;
			}
			else if (!ret)
				goto full;
			SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: appctx=%p"
				    " - disconnected by HAProxy (%d): %s\n",
				    (int)now.tv_sec, (int)now.tv_usec,
				    ((struct spoe_agent *)APPCTX_SPOE(appctx).agent)->id,
				    __FUNCTION__, appctx, spoe_status_code,
				    spoe_frm_err_reasons[spoe_status_code]);

			APPCTX_SPOE(appctx).task->expire = tick_add_ifset(now_ms, agent->timeout.ack);
			appctx->st0 = SPOE_APPCTX_ST_DISCONNECTING;
			/* fall through */

		case SPOE_APPCTX_ST_DISCONNECTING:
			if (si->state == SI_ST_CLO || si_opposite(si)->state == SI_ST_CLO) {
				appctx->st0 = SPOE_APPCTX_ST_EXIT;
				goto switchstate;
			}
			if (appctx->st1 == SPOE_APPCTX_ERR_TOUT) {
				appctx->st0 = SPOE_APPCTX_ST_EXIT;
				goto switchstate;
			}
			ret = recv_spoe_frame(appctx, NULL);
			if (ret < 0 || ret == 2) {
				appctx->st0 = SPOE_APPCTX_ST_EXIT;
				goto switchstate;
			}
			break;

		case SPOE_APPCTX_ST_EXIT:
			si_shutw(si);
			si_shutr(si);
			si_ic(si)->flags |= CF_READ_NULL;
			appctx->st0 = SPOE_APPCTX_ST_END;
			APPCTX_SPOE(appctx).task->expire = TICK_ETERNITY;
			/* fall through */

		case SPOE_APPCTX_ST_END:
			break;
	}

 out:
	if (APPCTX_SPOE(appctx).task->expire != TICK_ETERNITY)
		task_queue(APPCTX_SPOE(appctx).task);
	si_oc(si)->flags |= CF_READ_DONTWAIT;
	task_wakeup(si_strm(si)->task, TASK_WOKEN_IO);
	return;
 full:
	si_applet_cant_put(si);
	goto out;
}

struct applet spoe_applet = {
	.obj_type = OBJ_TYPE_APPLET,
	.name = "<SPOE>", /* used for logging */
	.fct = handle_spoe_applet,
	.release = release_spoe_applet,
};

/* Create a SPOE applet. On success, the created applet is returned, else
 * NULL. */
static struct appctx *
create_spoe_appctx(struct spoe_config *conf)
{
	struct appctx      *appctx;
	struct session     *sess;
	struct task        *task;
	struct stream      *strm;
	struct listener    *l = LIST_NEXT(&conf->agent_fe.conf.listeners,
					  struct listener *, by_fe);

	if ((appctx = appctx_new(&spoe_applet)) == NULL)
		goto out_error;

	appctx->st0 = SPOE_APPCTX_ST_CONNECT;
	if ((APPCTX_SPOE(appctx).task = task_new()) == NULL)
		goto out_free_appctx;
	APPCTX_SPOE(appctx).task->process   = process_spoe_applet;
	APPCTX_SPOE(appctx).task->expire    = TICK_ETERNITY;
	APPCTX_SPOE(appctx).task->context   = appctx;
	APPCTX_SPOE(appctx).agent           = conf->agent;
	APPCTX_SPOE(appctx).ctx             = NULL;
	APPCTX_SPOE(appctx).version         = 0;
	APPCTX_SPOE(appctx).max_frame_size  = global.tune.bufsize;
	task_wakeup(APPCTX_SPOE(appctx).task, TASK_WOKEN_INIT);

	sess = session_new(&conf->agent_fe, l, &appctx->obj_type);
	if (!sess)
		goto out_free_spoe;

	if ((task = task_new()) == NULL)
		goto out_free_sess;

	if ((strm = stream_new(sess, task, &appctx->obj_type)) == NULL)
		goto out_free_task;

	strm->target         = sess->listener->default_target;
	strm->req.analysers |= sess->listener->analysers;
	stream_set_backend(strm, conf->agent->b.be);

	/* applet is waiting for data */
	si_applet_cant_get(&strm->si[0]);
	appctx_wakeup(appctx);

	/* Increase the number of applets waiting the end of the hello
	 * handshake. */
	conf->agent->new_applets++;

	strm->do_log = NULL;
	strm->res.flags |= CF_READ_DONTWAIT;

	conf->agent_fe.feconn++;
	jobs++;
	totalconn++;

	return appctx;

	/* Error unrolling */
 out_free_task:
	task_free(task);
 out_free_sess:
	session_free(sess);
 out_free_spoe:
	task_free(APPCTX_SPOE(appctx).task);
 out_free_appctx:
	appctx_free(appctx);
 out_error:
	return NULL;
}

/* Wake up a SPOE applet attached to a SPOE context. */
static void
wakeup_spoe_appctx(struct spoe_context *ctx)
{
	if (ctx->appctx == NULL)
		return;
	if (ctx->appctx->st0 < SPOE_APPCTX_ST_EXIT) {
		si_applet_want_get(ctx->appctx->owner);
		si_applet_want_put(ctx->appctx->owner);
		appctx_wakeup(ctx->appctx);
	}
}


/* Run across the list of pending streams waiting for a SPOE applet and wake the
 * first. */
static void
offer_spoe_appctx(struct spoe_agent *agent, struct appctx *appctx)
{
	struct spoe_context *ctx;

	if (LIST_ISEMPTY(&agent->applet_wq))
		LIST_ADD(&agent->cache, &APPCTX_SPOE(appctx).list);
	else {
		ctx = LIST_NEXT(&agent->applet_wq, typeof(ctx), applet_wait);
		APPCTX_SPOE(appctx).ctx = ctx;
		ctx->appctx = appctx;
		LIST_DEL(&ctx->applet_wait);
		LIST_INIT(&ctx->applet_wait);
		task_wakeup(ctx->strm->task, TASK_WOKEN_MSG);
		SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p"
			    " - wake up stream to get available SPOE applet\n",
			    (int)now.tv_sec, (int)now.tv_usec, agent->id,
			    __FUNCTION__, ctx->strm);
	}
}

/* A failure occurred during SPOE applet creation. */
static void
on_new_spoe_appctx_failure(struct spoe_agent *agent)
{
	struct spoe_context *ctx;

	agent->new_applets--;
	list_for_each_entry(ctx, &agent->applet_wq, applet_wait) {
		ctx->errs++;
		task_wakeup(ctx->strm->task, TASK_WOKEN_MSG);
		SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p"
			    " - wake up stream because to SPOE applet connection failed\n",
			    (int)now.tv_sec, (int)now.tv_usec, agent->id,
			    __FUNCTION__, ctx->strm);
	}
}

static void
on_new_spoe_appctx_success(struct spoe_agent *agent, struct appctx *appctx)
{
	agent->new_applets--;
	offer_spoe_appctx(agent, appctx);
}
/* Retrieve a SPOE applet from the agent cache if possible, else create it. It
 * returns 1 on success, 0 to retry later and -1 if an error occurred. */
static int
acquire_spoe_appctx(struct spoe_context *ctx, int dir)
{
	struct spoe_config *conf = FLT_CONF(ctx->filter);
	struct spoe_agent  *agent = conf->agent;
	struct appctx      *appctx;

	/* If a process is already started for this SPOE context, retry
	 * later. */
	if (ctx->flags & SPOE_CTX_FL_PROCESS)
		goto wait;

	/* If needed, initialize the buffer that will be used to encode messages
	 * and decode actions. */
	if (ctx->buffer == &buf_empty) {
		if (!LIST_ISEMPTY(&ctx->buffer_wait)) {
			LIST_DEL(&ctx->buffer_wait);
			LIST_INIT(&ctx->buffer_wait);
		}

		if (!b_alloc_margin(&ctx->buffer, 0)) {
			LIST_ADDQ(&buffer_wq, &ctx->buffer_wait);
			goto wait;
		}
	}

	/* If the SPOE applet was already set, all is done. */
	if (ctx->appctx)
		goto success;

	/* Else try to retrieve it from the agent cache */
	if (!LIST_ISEMPTY(&agent->cache)) {
		appctx = LIST_NEXT(&agent->cache, typeof(appctx), ctx.spoe.list);
		LIST_DEL(&APPCTX_SPOE(appctx).list);
		APPCTX_SPOE(appctx).ctx = ctx;
		ctx->appctx = appctx;
		goto success;
	}

	/* If there is no server up for the agent's backend or it too many
	 * failure occurred, this is an error. */
	if ((!agent->b.be->srv_act && !agent->b.be->srv_bck) ||
	    ctx->errs >= MAX_NEW_SPOE_APPLET_ERRS)
		goto error;

	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p"
		    " - waiting for available SPOE appctx\n",
		    (int)now.tv_sec, (int)now.tv_usec, agent->id, __FUNCTION__,
		    ctx->strm);

	/* Else add the stream in the waiting queue. */
	if (LIST_ISEMPTY(&ctx->applet_wait))
		LIST_ADDQ(&agent->applet_wq, &ctx->applet_wait);

	/* Finally, create new SPOE applet if we can */
	if (agent->new_applets < MAX_NEW_SPOE_APPLETS) {
		if (create_spoe_appctx(conf) == NULL)
			goto error;
	}

  wait:
	return 0;

  success:
	/* Remove the stream from the waiting queue */
	if (!LIST_ISEMPTY(&ctx->applet_wait)) {
		LIST_DEL(&ctx->applet_wait);
		LIST_INIT(&ctx->applet_wait);
	}

	/* Set the right flag to prevent request and response processing
	 * in same time. */
	ctx->flags |= ((dir == SMP_OPT_DIR_REQ)
		       ? SPOE_CTX_FL_REQ_PROCESS
		       : SPOE_CTX_FL_RSP_PROCESS);
	ctx->errs = 0;

	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p"
		    " - acquire SPOE appctx %p from cache\n",
		    (int)now.tv_sec, (int)now.tv_usec, agent->id,
		    __FUNCTION__, ctx->strm, ctx->appctx);
	return 1;

  error:
	/* Remove the stream from the waiting queue */
	if (!LIST_ISEMPTY(&ctx->applet_wait)) {
		LIST_DEL(&ctx->applet_wait);
		LIST_INIT(&ctx->applet_wait);
	}

	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p"
		    " - failed to acquire SPOE appctx errs=%u\n",
		    (int)now.tv_sec, (int)now.tv_usec, agent->id,
		    __FUNCTION__, ctx->strm, ctx->errs);
	send_log(ctx->strm->be, LOG_WARNING, "failed to acquire SPOE applet.\n");

	return -1;
}

/* Release a SPOE applet and push it in the agent cache. */
static void
release_spoe_appctx(struct spoe_context *ctx)
{
	struct spoe_config *conf = FLT_CONF(ctx->filter);
	struct spoe_agent  *agent = conf->agent;
	struct appctx      *appctx = ctx->appctx;

	/* Reset the flag to allow next processing */
	ctx->flags &= ~SPOE_CTX_FL_PROCESS;

	/* Release the buffer if needed */
	if (ctx->buffer != &buf_empty) {
		b_free(&ctx->buffer);
		if (!LIST_ISEMPTY(&buffer_wq))
			stream_offer_buffers();
	}

	/* If there is no SPOE applet, all is done */
	if (!appctx)
		return;

	/* Else, reassign it or push it in the agent cache */
	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p"
		    " - release SPOE appctx %p\n",
		    (int)now.tv_sec, (int)now.tv_usec, agent->id,
		    __FUNCTION__, ctx->strm, appctx);

	APPCTX_SPOE(appctx).ctx = NULL;
	ctx->appctx = NULL;
	offer_spoe_appctx(agent, appctx);
}

/***************************************************************************
 * Functions that process SPOE messages and actions
 **************************************************************************/
/* Process SPOE messages for a specific event. During the processing, it returns
 * 0 and it returns 1 when the processing is finished. If an error occurred, -1
 * is returned. */
static int
process_spoe_messages(struct stream *s, struct spoe_context *ctx,
		      struct list *messages, int dir)
{
	struct spoe_message *msg;
	struct sample       *smp;
	struct spoe_arg     *arg;
	char    *p;
	size_t  max_size;
	int     off, flag, idx = 0;

	/* Reserve 32 bytes from the frame Metadata */
	max_size = APPCTX_SPOE(ctx->appctx).max_frame_size - 32;

	b_reset(ctx->buffer);
	p = ctx->buffer->p;

	/* Loop on messages */
	list_for_each_entry(msg, messages, list) {
		if (idx + msg->id_len + 1 > max_size)
			goto skip;

		/* Set the message name */
		idx += encode_spoe_string(msg->id, msg->id_len, p+idx);

		/* Save offset where to store the number of arguments for this
		 * message */
		off = idx++;
		p[off] = 0;

		/* Loop on arguments */
		list_for_each_entry(arg, &msg->args, list) {
			p[off]++; /* Increment the number of arguments */

			if (idx + arg->name_len + 1 > max_size)
				goto skip;

			/* Encode the arguement name as a string. It can by NULL */
			idx += encode_spoe_string(arg->name, arg->name_len, p+idx);

			/* Fetch the arguement value */
			smp = sample_process(s->be, s->sess, s, dir|SMP_OPT_FINAL, arg->expr, NULL);
			if (!smp) {
				/* If no value is available, set it to NULL */
				p[idx++] = SPOE_DATA_T_NULL;
				continue;
			}

			/* Else, encode the arguement value */
			switch (smp->data.type) {
				case SMP_T_BOOL:
					flag = ((!smp->data.u.sint) ? SPOE_DATA_FL_FALSE : SPOE_DATA_FL_TRUE);
					p[idx++] = (SPOE_DATA_T_BOOL | flag);
					break;
				case SMP_T_SINT:
					p[idx++] = SPOE_DATA_T_INT64;
					if (idx + 8 > max_size)
						goto skip;
					idx += encode_spoe_varint(smp->data.u.sint, p+idx);
					break;
				case SMP_T_IPV4:
					p[idx++] = SPOE_DATA_T_IPV4;
					if (idx + 4 > max_size)
						goto skip;
					memcpy(p+idx, &smp->data.u.ipv4, 4);
					idx += 4;
					break;
				case SMP_T_IPV6:
					p[idx++] = SPOE_DATA_T_IPV6;
					if (idx + 16 > max_size)
						goto skip;
					memcpy(p+idx, &smp->data.u.ipv6, 16);
					idx += 16;
					break;
				case SMP_T_STR:
					p[idx++] = SPOE_DATA_T_STR;
					if (idx + smp->data.u.str.len > max_size)
						goto skip;
					idx += encode_spoe_string(smp->data.u.str.str,
								  smp->data.u.str.len,
								  p+idx);
					break;
				case SMP_T_BIN:
					p[idx++] = SPOE_DATA_T_BIN;
					if (idx + smp->data.u.str.len > max_size)
						goto skip;
					idx += encode_spoe_string(smp->data.u.str.str,
								  smp->data.u.str.len,
								  p+idx);
					break;
				case SMP_T_METH:
					if (smp->data.u.meth.meth == HTTP_METH_OTHER) {
						p[idx++] = SPOE_DATA_T_STR;
						if (idx + http_known_methods[smp->data.u.meth.meth].len > max_size)
							goto skip;
						idx += encode_spoe_string(http_known_methods[smp->data.u.meth.meth].name,
									  http_known_methods[smp->data.u.meth.meth].len,
									  p+idx);
					}
					else {
						p[idx++] = SPOE_DATA_T_STR;
						if (idx + smp->data.u.str.len > max_size)
							goto skip;
						idx += encode_spoe_string(smp->data.u.meth.str.str,
									  smp->data.u.meth.str.len,
									  p+idx);
					}
					break;
				default:
					p[idx++] = SPOE_DATA_T_NULL;
			}
		}
	}
	ctx->buffer->i = idx;
	return 1;

  skip:
	b_reset(ctx->buffer);
	return 0;
}

/* Helper function to set a variable */
static void
set_spoe_var(struct spoe_context *ctx, char *scope, char *name, int len,
	     struct sample *smp)
{
	struct spoe_config *conf = FLT_CONF(ctx->filter);
	struct spoe_agent  *agent = conf->agent;
	char                varname[64];

	memset(varname, 0, sizeof(varname));
	len = snprintf(varname, sizeof(varname), "%s.%s.%.*s",
		       scope, agent->var_pfx, len, name);
	vars_set_by_name_ifexist(varname, len, smp);
}

/* Helper function to unset a variable */
static void
unset_spoe_var(struct spoe_context *ctx, char *scope, char *name, int len,
	       struct sample *smp)
{
	struct spoe_config *conf = FLT_CONF(ctx->filter);
	struct spoe_agent  *agent = conf->agent;
	char                varname[64];

	memset(varname, 0, sizeof(varname));
	len = snprintf(varname, sizeof(varname), "%s.%s.%.*s",
		       scope, agent->var_pfx, len, name);
	vars_unset_by_name_ifexist(varname, len, smp);
}


/* Process SPOE actions for a specific event. During the processing, it returns
 * 0 and it returns 1 when the processing is finished. If an error occurred, -1
 * is returned. */
static int
process_spoe_actions(struct stream *s, struct spoe_context *ctx,
		     enum spoe_event ev, int dir)
{
	char  *p;
	size_t size;
	int    off, i, idx = 0;

	p    = ctx->buffer->p;
	size = ctx->buffer->i;

	while (idx < size)  {
		char                 *str;
		uint64_t              sz;
		struct sample         smp;
		enum spoe_action_type type;

		off = idx;
		if (idx+2 > size)
			goto skip;

		type = p[idx++];
		switch (type) {
			case SPOE_ACT_T_SET_VAR: {
				char *scope;

				if (p[idx++] != 3)
					goto skip_action;

				switch (p[idx++]) {
					case SPOE_SCOPE_PROC: scope = "proc"; break;
					case SPOE_SCOPE_SESS: scope = "sess"; break;
					case SPOE_SCOPE_TXN : scope = "txn";  break;
					case SPOE_SCOPE_REQ : scope = "req";  break;
					case SPOE_SCOPE_RES : scope = "res";  break;
					default: goto skip;
				}

				idx += decode_spoe_string(p+idx, p+size, &str, &sz);
				if (str == NULL)
					goto skip;
				memset(&smp, 0, sizeof(smp));
				smp_set_owner(&smp, s->be, s->sess, s, dir|SMP_OPT_FINAL);
				if (decode_spoe_data(p+idx, p+size, &smp) == -1)
					goto skip;

				SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p"
					    " - set-var '%s.%s.%.*s'\n",
					    (int)now.tv_sec, (int)now.tv_usec,
					    ((struct spoe_config *)FLT_CONF(ctx->filter))->agent->id,
					    __FUNCTION__, s, scope,
					    ((struct spoe_config *)FLT_CONF(ctx->filter))->agent->var_pfx,
					    (int)sz, str);

				set_spoe_var(ctx, scope, str, sz, &smp);
				break;
			}

			case SPOE_ACT_T_UNSET_VAR: {
				char *scope;

				if (p[idx++] != 2)
					goto skip_action;

				switch (p[idx++]) {
					case SPOE_SCOPE_PROC: scope = "proc"; break;
					case SPOE_SCOPE_SESS: scope = "sess"; break;
					case SPOE_SCOPE_TXN : scope = "txn";  break;
					case SPOE_SCOPE_REQ : scope = "req";  break;
					case SPOE_SCOPE_RES : scope = "res";  break;
					default: goto skip;
				}

				idx += decode_spoe_string(p+idx, p+size, &str, &sz);
				if (str == NULL)
					goto skip;
				memset(&smp, 0, sizeof(smp));
				smp_set_owner(&smp, s->be, s->sess, s, dir|SMP_OPT_FINAL);

				SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p"
					    " - unset-var '%s.%s.%.*s'\n",
					    (int)now.tv_sec, (int)now.tv_usec,
					    ((struct spoe_config *)FLT_CONF(ctx->filter))->agent->id,
					    __FUNCTION__, s, scope,
					    ((struct spoe_config *)FLT_CONF(ctx->filter))->agent->var_pfx,
					    (int)sz, str);

				unset_spoe_var(ctx, scope, str, sz, &smp);
				break;
			}

			default:
			  skip_action:
				if ((i = skip_spoe_action(p+off, p+size)) == -1)
					goto skip;
				idx += i;
		}
	}

	return 1;
  skip:
	return 0;
}


/* Process a SPOE event. First, this functions will process messages attached to
 * this event and send them to an agent in a NOTIFY frame. Then, it will wait a
 * ACK frame to process corresponding actions. During all the processing, it
 * returns 0 and it returns 1 when the processing is finished. If an error
 * occurred, -1 is returned. */
static int
process_spoe_event(struct stream *s, struct spoe_context *ctx,
		   enum spoe_event ev)
{
	int dir, ret = 1;

	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p"
		    " - ctx-state=%s - event=%s\n",
		    (int)now.tv_sec, (int)now.tv_usec,
		    ((struct spoe_config *)FLT_CONF(ctx->filter))->agent->id,
		    __FUNCTION__, s, spoe_ctx_state_str[ctx->state],
		    spoe_event_str[ev]);

	dir = ((ev < SPOE_EV_ON_SERVER_SESS) ? SMP_OPT_DIR_REQ : SMP_OPT_DIR_RES);

	if (LIST_ISEMPTY(&(ctx->messages[ev])))
		goto out;

	if (ctx->state == SPOE_CTX_ST_ERROR)
		goto error;

	if (ctx->state == SPOE_CTX_ST_READY) {
		ret = acquire_spoe_appctx(ctx, dir);
		if (ret <= 0) {
			if (!ret)
				goto out;
			goto error;
		}
		ctx->state = SPOE_CTX_ST_SENDING_MSGS;
	}

	if (ctx->appctx == NULL)
		goto error;

	if (ctx->state == SPOE_CTX_ST_SENDING_MSGS) {
		ret = process_spoe_messages(s, ctx, &(ctx->messages[ev]), dir);
		if (ret <= 0) {
			if (!ret)
				goto skip;
			goto error;
		}
		wakeup_spoe_appctx(ctx);
		ret = 0;
		goto out;
	}

	if (ctx->state == SPOE_CTX_ST_WAITING_ACK) {
		wakeup_spoe_appctx(ctx);
		ret = 0;
		goto out;
	}

	if (ctx->state == SPOE_CTX_ST_DONE) {
		ret = process_spoe_actions(s, ctx, ev, dir);
		if (ret <= 0) {
			if (!ret)
				goto skip;
			goto error;
		}
		ctx->frame_id++;
		release_spoe_appctx(ctx);
		ctx->state = SPOE_CTX_ST_READY;
	}

  out:
	return ret;

  skip:
	release_spoe_appctx(ctx);
	ctx->state = SPOE_CTX_ST_READY;
	return 1;

  error:
	release_spoe_appctx(ctx);
	ctx->state = SPOE_CTX_ST_ERROR;
	return 1;
}


/***************************************************************************
 * Functions that create/destroy SPOE contexts
 **************************************************************************/
static struct spoe_context *
create_spoe_context(struct filter *filter)
{
	struct spoe_config  *conf = FLT_CONF(filter);
	struct spoe_context *ctx;

	ctx = pool_alloc_dirty(pool2_spoe_ctx);
	if (ctx == NULL) {
		return NULL;
	}
	memset(ctx, 0, sizeof(*ctx));
	ctx->filter   = filter;
	ctx->state    = SPOE_CTX_ST_NONE;
	ctx->flags    = 0;
	ctx->errs     = 0;
	ctx->messages = conf->agent->messages;
	ctx->buffer   = &buf_empty;
	LIST_INIT(&ctx->buffer_wait);
	LIST_INIT(&ctx->applet_wait);

	ctx->stream_id  = 0;
	ctx->frame_id   = 1;

	return ctx;
}

static void
destroy_spoe_context(struct spoe_context *ctx)
{
	if (!ctx)
		return;

	if (ctx->appctx)
		APPCTX_SPOE(ctx->appctx).ctx = NULL;
	if (!LIST_ISEMPTY(&ctx->buffer_wait))
		LIST_DEL(&ctx->buffer_wait);
	if (!LIST_ISEMPTY(&ctx->applet_wait))
		LIST_DEL(&ctx->applet_wait);
	pool_free2(pool2_spoe_ctx, ctx);
}

static void
reset_spoe_context(struct spoe_context *ctx)
{
	ctx->state  = SPOE_CTX_ST_READY;
	ctx->flags &= ~SPOE_CTX_FL_PROCESS;
}


/***************************************************************************
 * Hooks that manage the filter lifecycle (init/check/deinit)
 **************************************************************************/
/* Signal handler: Do a soft stop, wakeup SPOE applet */
static void
sig_stop_spoe(struct sig_handler *sh)
{
	struct proxy *p;

	p = proxy;
	while (p) {
		struct flt_conf *fconf;

		list_for_each_entry(fconf, &p->filter_configs, list) {
			struct spoe_config *conf  = fconf->conf;
			struct spoe_agent  *agent = conf->agent;
			struct appctx      *appctx;

			list_for_each_entry(appctx, &agent->cache, ctx.spoe.list) {
				si_applet_want_get(appctx->owner);
				si_applet_want_put(appctx->owner);
				appctx_wakeup(appctx);
			}
		}
		p = p->next;
	}
}


/* Initialize the SPOE filter. Returns -1 on error, else 0. */
static int
spoe_init(struct proxy *px, struct flt_conf *fconf)
{
	struct spoe_config *conf = fconf->conf;
	struct listener   *l;

        memset(&conf->agent_fe, 0, sizeof(conf->agent_fe));
        init_new_proxy(&conf->agent_fe);
        conf->agent_fe.parent = conf->agent;
        conf->agent_fe.last_change = now.tv_sec;
        conf->agent_fe.id = conf->agent->id;
        conf->agent_fe.cap = PR_CAP_FE;
        conf->agent_fe.mode = PR_MODE_TCP;
        conf->agent_fe.maxconn = 0;
        conf->agent_fe.options2 |= PR_O2_INDEPSTR;
        conf->agent_fe.conn_retries = CONN_RETRIES;
        conf->agent_fe.accept = frontend_accept;
        conf->agent_fe.srv = NULL;
        conf->agent_fe.timeout.client = TICK_ETERNITY;
	conf->agent_fe.default_target = &spoe_applet.obj_type;
	conf->agent_fe.fe_req_ana = AN_REQ_SWITCHING_RULES;

	if ((l = calloc(1, sizeof(*l))) == NULL) {
		Alert("spoe_init : out of memory.\n");
		goto out_error;
	}
	l->obj_type = OBJ_TYPE_LISTENER;
        l->obj_type  = OBJ_TYPE_LISTENER;
        l->frontend  = &conf->agent_fe;
        l->state     = LI_READY;
        l->analysers = conf->agent_fe.fe_req_ana;
	LIST_ADDQ(&conf->agent_fe.conf.listeners, &l->by_fe);

	if (!sighandler_registered) {
		signal_register_fct(0, sig_stop_spoe, 0);
		sighandler_registered = 1;
	}

	return 0;

 out_error:
	return -1;
}

/* Free ressources allocated by the SPOE filter. */
static void
spoe_deinit(struct proxy *px, struct flt_conf *fconf)
{
	struct spoe_config *conf = fconf->conf;

	if (conf) {
		struct spoe_agent *agent = conf->agent;
		struct listener   *l = LIST_NEXT(&conf->agent_fe.conf.listeners,
						 struct listener *, by_fe);

		free(l);
		release_spoe_agent(agent);
		free(conf);
	}
	fconf->conf = NULL;
}

/* Check configuration of a SPOE filter for a specified proxy.
 * Return 1 on error, else 0. */
static int
spoe_check(struct proxy *px, struct flt_conf *fconf)
{
	struct spoe_config *conf = fconf->conf;
	struct proxy       *target;

	target = proxy_be_by_name(conf->agent->b.name);
	if (target == NULL) {
		Alert("Proxy %s : unknown backend '%s' used by SPOE agent '%s'"
		      " declared at %s:%d.\n",
		      px->id, conf->agent->b.name, conf->agent->id,
		      conf->agent->conf.file, conf->agent->conf.line);
		return 1;
	}
	if (target->mode != PR_MODE_TCP) {
		Alert("Proxy %s : backend '%s' used by SPOE agent '%s' declared"
		      " at %s:%d does not support HTTP mode.\n",
		      px->id, target->id, conf->agent->id,
		      conf->agent->conf.file, conf->agent->conf.line);
		return 1;
	}

	free(conf->agent->b.name);
	conf->agent->b.name = NULL;
	conf->agent->b.be = target;
	return 0;
}

/**************************************************************************
 * Hooks attached to a stream
 *************************************************************************/
/* Called when a filter instance is created and attach to a stream. It creates
 * the context that will be used to process this stream. */
static int
spoe_start(struct stream *s, struct filter *filter)
{
	struct spoe_context *ctx;

	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p\n",
		    (int)now.tv_sec, (int)now.tv_usec,
		    ((struct spoe_config *)FLT_CONF(filter))->agent->id,
		    __FUNCTION__, s);

	ctx = create_spoe_context(filter);
	if (ctx == NULL) {
		send_log(s->be, LOG_EMERG,
			 "failed to create SPOE context for proxy %s\n",
			 s->be->id);
		return 0;
	}

	ctx->strm   = s;
	ctx->state  = SPOE_CTX_ST_READY;
	filter->ctx = ctx;

	if (!LIST_ISEMPTY(&ctx->messages[SPOE_EV_ON_TCP_REQ_FE]))
		filter->pre_analyzers |= AN_REQ_INSPECT_FE;

	if (!LIST_ISEMPTY(&ctx->messages[SPOE_EV_ON_TCP_REQ_BE]))
		filter->pre_analyzers |= AN_REQ_INSPECT_BE;

	if (!LIST_ISEMPTY(&ctx->messages[SPOE_EV_ON_TCP_RSP]))
		filter->pre_analyzers |= AN_RES_INSPECT;

	if (!LIST_ISEMPTY(&ctx->messages[SPOE_EV_ON_HTTP_REQ_FE]))
		filter->pre_analyzers |= AN_REQ_HTTP_PROCESS_FE;

	if (!LIST_ISEMPTY(&ctx->messages[SPOE_EV_ON_HTTP_REQ_BE]))
		filter->pre_analyzers |= AN_REQ_HTTP_PROCESS_BE;

	if (!LIST_ISEMPTY(&ctx->messages[SPOE_EV_ON_HTTP_RSP]))
		filter->pre_analyzers |= AN_RES_HTTP_PROCESS_FE;

	return 1;
}

/* Called when a filter instance is detached from a stream. It release the
 * attached SPOE context. */
static void
spoe_stop(struct stream *s, struct filter *filter)
{
	struct spoe_context *ctx = filter->ctx;

	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p\n",
		    (int)now.tv_sec, (int)now.tv_usec,
		    ((struct spoe_config *)FLT_CONF(filter))->agent->id,
		    __FUNCTION__, s);

	if (ctx) {
		release_spoe_appctx(ctx);
		destroy_spoe_context(ctx);
	}
}

/* Called when we are ready to filter data on a channel */
static int
spoe_start_analyze(struct stream *s, struct filter *filter, struct channel *chn)
{
	struct spoe_context *ctx = filter->ctx;
	int                  ret = 1;

	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p - ctx-state=%s"
		    " - ctx-flags=0x%08x\n",
		    (int)now.tv_sec, (int)now.tv_usec,
		    ((struct spoe_config *)FLT_CONF(filter))->agent->id,
		    __FUNCTION__, s, spoe_ctx_state_str[ctx->state], ctx->flags);

	if (!(chn->flags & CF_ISRESP)) {
		if (filter->pre_analyzers & AN_REQ_INSPECT_FE)
			chn->analysers |= AN_REQ_INSPECT_FE;
		if (filter->pre_analyzers & AN_REQ_INSPECT_BE)
			chn->analysers |= AN_REQ_INSPECT_BE;

		if (ctx->flags & SPOE_CTX_FL_CLI_CONNECTED)
			goto out;

		ctx->stream_id = s->uniq_id;
		if (ctx->state != SPOE_CTX_ST_NONE && ctx->state != SPOE_CTX_ST_ERROR) {
			ret = process_spoe_event(s, ctx, SPOE_EV_ON_CLIENT_SESS);
			if (ret != 1)
				goto out;
		}
		ctx->flags |= SPOE_CTX_FL_CLI_CONNECTED;
	}
	else {
		if (filter->pre_analyzers & SPOE_EV_ON_TCP_RSP)
			chn->analysers |= AN_RES_INSPECT;

		if (ctx->flags & SPOE_CTX_FL_SRV_CONNECTED)
			goto out;

		if (ctx->state != SPOE_CTX_ST_NONE && ctx->state != SPOE_CTX_ST_ERROR) {
			ret = process_spoe_event(s, ctx, SPOE_EV_ON_SERVER_SESS);
			if (ret != 1)
				goto out;
		}
		ctx->flags |= SPOE_CTX_FL_SRV_CONNECTED;
	}

  out:
	if (!ret) {
                channel_dont_read(chn);
                channel_dont_close(chn);
	}
	return ret;
}

/* Called before a processing happens on a given channel */
static int
spoe_chn_pre_analyze(struct stream *s, struct filter *filter,
		     struct channel *chn, unsigned an_bit)
{
	struct spoe_context *ctx = filter->ctx;
	int                  ret = 1;

	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p - ctx-state=%s"
		    " - ctx-flags=0x%08x - ana=0x%08x\n",
		    (int)now.tv_sec, (int)now.tv_usec,
		    ((struct spoe_config *)FLT_CONF(filter))->agent->id,
		    __FUNCTION__, s, spoe_ctx_state_str[ctx->state],
		    ctx->flags, an_bit);

	if (ctx->state == SPOE_CTX_ST_NONE || ctx->state == SPOE_CTX_ST_ERROR)
		goto out;

	switch (an_bit) {
		case AN_REQ_INSPECT_FE:
			ret = process_spoe_event(s, ctx, SPOE_EV_ON_TCP_REQ_FE);
			break;
		case AN_REQ_INSPECT_BE:
			ret = process_spoe_event(s, ctx, SPOE_EV_ON_TCP_REQ_BE);
			break;
		case AN_RES_INSPECT:
			ret = process_spoe_event(s, ctx, SPOE_EV_ON_TCP_RSP);
			break;
		case AN_REQ_HTTP_PROCESS_FE:
			ret = process_spoe_event(s, ctx, SPOE_EV_ON_HTTP_REQ_FE);
			break;
		case AN_REQ_HTTP_PROCESS_BE:
			ret = process_spoe_event(s, ctx, SPOE_EV_ON_HTTP_REQ_BE);
			break;
		case AN_RES_HTTP_PROCESS_FE:
			ret = process_spoe_event(s, ctx, SPOE_EV_ON_HTTP_RSP);
			break;
	}

  out:
	if (!ret) {
                channel_dont_read(chn);
                channel_dont_close(chn);
	}
	return ret;
}

/* Called when the filtering on the channel ends. */
static int
spoe_end_analyze(struct stream *s, struct filter *filter, struct channel *chn)
{
	struct spoe_context *ctx = filter->ctx;

	SPOE_PRINTF(stderr, "%d.%06d [SPOE/%-15s] %s: stream=%p - ctx-state=%s"
		    " - ctx-flags=0x%08x\n",
		    (int)now.tv_sec, (int)now.tv_usec,
		    ((struct spoe_config *)FLT_CONF(filter))->agent->id,
		    __FUNCTION__, s, spoe_ctx_state_str[ctx->state], ctx->flags);

	if (!(ctx->flags & SPOE_CTX_FL_PROCESS)) {
		reset_spoe_context(ctx);
	}

	return 1;
}

/********************************************************************
 * Functions that manage the filter initialization
 ********************************************************************/
struct flt_ops spoe_ops = {
	/* Manage SPOE filter, called for each filter declaration */
	.init   = spoe_init,
	.deinit = spoe_deinit,
	.check  = spoe_check,

	/* Handle start/stop of SPOE */
	.attach = spoe_start,
	.detach = spoe_stop,

	/* Handle channels activity */
	.channel_start_analyze = spoe_start_analyze,
	.channel_pre_analyze   = spoe_chn_pre_analyze,
	.channel_end_analyze   = spoe_end_analyze,
};


static int
cfg_parse_spoe_agent(const char *file, int linenum, char **args, int kwm)
{
	const char *err;
	int         i, err_code = 0;

	if ((cfg_scope == NULL && curengine != NULL) ||
	    (cfg_scope != NULL && curengine == NULL) ||
	    strcmp(curengine, cfg_scope))
		goto out;

	if (!strcmp(args[0], "spoe-agent")) { /* new spoe-agent section */
		if (!*args[1]) {
			Alert("parsing [%s:%d] : missing name for spoe-agent section.\n",
			      file, linenum);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}
		if (*args[2]) {
			Alert("parsing [%s:%d] : cannot handle unexpected argument '%s'.\n",
			      file, linenum, args[2]);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}

		err = invalid_char(args[1]);
		if (err) {
			Alert("parsing [%s:%d] : character '%c' is not permitted in '%s' name '%s'.\n",
			      file, linenum, *err, args[0], args[1]);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}

		if (curagent != NULL) {
			Alert("parsing [%s:%d] : another spoe-agent section previously defined.\n",
			      file, linenum);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}
		if ((curagent = calloc(1, sizeof(*curagent))) == NULL) {
			Alert("parsing [%s:%d] : out of memory.\n", file, linenum);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}

		curagent->id              = strdup(args[1]);
		curagent->conf.file       = strdup(file);
		curagent->conf.line       = linenum;
		curagent->timeout.hello   = TICK_ETERNITY;
		curagent->timeout.ack     = TICK_ETERNITY;
		curagent->timeout.idle    = TICK_ETERNITY;
		curagent->var_pfx         = NULL;
		curagent->new_applets     = 0;

		for (i = 0; i < SPOE_EV_EVENTS; ++i)
			LIST_INIT(&curagent->messages[i]);
		LIST_INIT(&curagent->cache);
		LIST_INIT(&curagent->applet_wq);
	}
	else if (!strcmp(args[0], "use-backend")) {
		if (!*args[1]) {
			Alert("parsing [%s:%d] : '%s' expects a backend name.\n",
			      file, linenum, args[0]);
			err_code |= ERR_ALERT | ERR_FATAL;
			goto out;
		}
		if (*args[2]) {
			Alert("parsing [%s:%d] : cannot handle unexpected argument '%s'.\n",
			      file, linenum, args[2]);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}
		free(curagent->b.name);
		curagent->b.name = strdup(args[1]);
	}
	else if (!strcmp(args[0], "messages")) {
		int cur_arg = 1;
		while (*args[cur_arg]) {
			struct spoe_msg_placeholder *mp = NULL;

			list_for_each_entry(mp, &curmps, list) {
				if (!strcmp(mp->id, args[cur_arg])) {
					Alert("parsing [%s:%d]: spoe-message message '%s' already declared.\n",
					      file, linenum, args[cur_arg]);
					err_code |= ERR_ALERT | ERR_FATAL;
					goto out;
				}
			}

			if ((mp = calloc(1, sizeof(*mp))) == NULL) {
				Alert("parsing [%s:%d] : out of memory.\n", file, linenum);
				err_code |= ERR_ALERT | ERR_ABORT;
				goto out;
			}
			mp->id = strdup(args[cur_arg]);
			LIST_ADDQ(&curmps, &mp->list);
			cur_arg++;
		}
	}
	else if (!strcmp(args[0], "timeout")) {
		unsigned int *tv = NULL;
		const char   *res;
		unsigned      timeout;

		if (!*args[1]) {
			Alert("parsing [%s:%d] : 'timeout' expects 'connect', 'idle' and 'ack'.\n",
			      file, linenum);
			err_code |= ERR_ALERT | ERR_FATAL;
			goto out;
		}
		if (!strcmp(args[1], "hello"))
			tv = &curagent->timeout.hello;
		else if (!strcmp(args[1], "idle"))
			tv = &curagent->timeout.idle;
		else if (!strcmp(args[1], "ack"))
			tv = &curagent->timeout.ack;
		else {
			Alert("parsing [%s:%d] : 'timeout' supports 'connect', 'idle' and 'ack' (got %s).\n",
			      file, linenum, args[1]);
			err_code |= ERR_ALERT | ERR_FATAL;
			goto out;
		}
		if (!*args[2]) {
			Alert("parsing [%s:%d] : 'timeout %s' expects an integer value (in milliseconds).\n",
			      file, linenum, args[1]);
			err_code |= ERR_ALERT | ERR_FATAL;
			goto out;
		}
		res = parse_time_err(args[2], &timeout, TIME_UNIT_MS);
		if (res) {
			Alert("parsing [%s:%d] : unexpected character '%c' in 'timeout %s'.\n",
			      file, linenum, *res, args[1]);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}
		if (*args[3]) {
			Alert("parsing [%s:%d] : cannot handle unexpected argument '%s'.\n",
			      file, linenum, args[3]);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}
		*tv = MS_TO_TICKS(timeout);
	}
	else if (!strcmp(args[0], "option")) {
		if (!*args[1]) {
                        Alert("parsing [%s:%d]: '%s' expects an option name.\n",
                              file, linenum, args[0]);
                        err_code |= ERR_ALERT | ERR_FATAL;
                        goto out;
                }
		if (!strcmp(args[1], "var-prefix")) {
			char *tmp;

			if (!*args[2]) {
				Alert("parsing [%s:%d]: '%s %s' expects a value.\n",
				      file, linenum, args[0],
				      args[1]);
				err_code |= ERR_ALERT | ERR_FATAL;
				goto out;
			}
			tmp = args[2];
			while (*tmp) {
				if (!isalnum(*tmp) && *tmp != '_' && *tmp != '.') {
					Alert("parsing [%s:%d]: '%s %s' only supports [a-zA-Z_-.] chars.\n",
					      file, linenum, args[0], args[1]);
					err_code |= ERR_ALERT | ERR_FATAL;
					goto out;
				}
				tmp++;
			}
			curagent->var_pfx = strdup(args[2]);
		}
		else {
			Alert("parsing [%s:%d]: option '%s' is not supported.\n",
			      file, linenum, args[1]);
			err_code |= ERR_ALERT | ERR_FATAL;
			goto out;
		}
	}
	else if (*args[0]) {
		Alert("parsing [%s:%d] : unknown keyword '%s' in spoe-agent section.\n",
		      file, linenum, args[0]);
		err_code |= ERR_ALERT | ERR_FATAL;
		goto out;
	}
 out:
	return err_code;
}

static int
cfg_parse_spoe_message(const char *file, int linenum, char **args, int kwm)
{
	struct spoe_message *msg;
	struct spoe_arg     *arg;
	const char          *err;
	char                *errmsg   = NULL;
	int                  err_code = 0;

	if ((cfg_scope == NULL && curengine != NULL) ||
	    (cfg_scope != NULL && curengine == NULL) ||
	    strcmp(curengine, cfg_scope))
		goto out;

	if (!strcmp(args[0], "spoe-message")) { /* new spoe-message section */
		if (!*args[1]) {
			Alert("parsing [%s:%d] : missing name for spoe-message section.\n",
			      file, linenum);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}
		if (*args[2]) {
			Alert("parsing [%s:%d] : cannot handle unexpected argument '%s'.\n",
			      file, linenum, args[2]);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}

		err = invalid_char(args[1]);
		if (err) {
			Alert("parsing [%s:%d] : character '%c' is not permitted in '%s' name '%s'.\n",
			      file, linenum, *err, args[0], args[1]);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}

		list_for_each_entry(msg, &curmsgs, list) {
			if (!strcmp(msg->id, args[1])) {
				Alert("parsing [%s:%d]: spoe-message section '%s' has the same"
				      " name as another one declared at %s:%d.\n",
				      file, linenum, args[1], msg->conf.file, msg->conf.line);
				err_code |= ERR_ALERT | ERR_FATAL;
				goto out;
			}
		}

		if ((curmsg = calloc(1, sizeof(*curmsg))) == NULL) {
			Alert("parsing [%s:%d] : out of memory.\n", file, linenum);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}

		curmsg->id = strdup(args[1]);
		curmsg->id_len = strlen(curmsg->id);
		curmsg->event  = SPOE_EV_NONE;
		curmsg->conf.file = strdup(file);
		curmsg->conf.line = linenum;
		LIST_INIT(&curmsg->args);
		LIST_ADDQ(&curmsgs, &curmsg->list);
	}
	else if (!strcmp(args[0], "args")) {
		int cur_arg = 1;

		curproxy->conf.args.ctx  = ARGC_SPOE;
		curproxy->conf.args.file = file;
		curproxy->conf.args.line = linenum;
		while (*args[cur_arg]) {
			char *delim = strchr(args[cur_arg], '=');
			int   idx = 0;

			if ((arg = calloc(1, sizeof(*arg))) == NULL) {
				Alert("parsing [%s:%d] : out of memory.\n", file, linenum);
				err_code |= ERR_ALERT | ERR_ABORT;
				goto out;
			}

			if (!delim) {
				arg->name = NULL;
				arg->name_len  = 0;
				delim = args[cur_arg];
			}
			else {
				arg->name = my_strndup(args[cur_arg], delim - args[cur_arg]);
				arg->name_len = delim - args[cur_arg];
				delim++;
			}

			arg->expr = sample_parse_expr(&delim, &idx, file, linenum, &errmsg, &curproxy->conf.args);
			if (arg->expr == NULL) {
				Alert("parsing [%s:%d] : '%s': %s.\n", file, linenum, args[0], errmsg);
				err_code |= ERR_ALERT | ERR_FATAL;
				free(arg->name);
				free(arg);
				goto out;
			}
			LIST_ADDQ(&curmsg->args, &arg->list);
			cur_arg++;
		}
		curproxy->conf.args.file = NULL;
		curproxy->conf.args.line = 0;
	}
	else if (!strcmp(args[0], "event")) {
		if (!*args[1]) {
			Alert("parsing [%s:%d] : missing event name.\n", file, linenum);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}
		if (!strcmp(args[1], spoe_event_str[SPOE_EV_ON_CLIENT_SESS]))
			curmsg->event = SPOE_EV_ON_CLIENT_SESS;
		else if (!strcmp(args[1], spoe_event_str[SPOE_EV_ON_SERVER_SESS]))
			curmsg->event = SPOE_EV_ON_SERVER_SESS;

		else if (!strcmp(args[1], spoe_event_str[SPOE_EV_ON_TCP_REQ_FE]))
			curmsg->event = SPOE_EV_ON_TCP_REQ_FE;
		else if (!strcmp(args[1], spoe_event_str[SPOE_EV_ON_TCP_REQ_BE]))
			curmsg->event = SPOE_EV_ON_TCP_REQ_BE;
		else if (!strcmp(args[1], spoe_event_str[SPOE_EV_ON_TCP_RSP]))
			curmsg->event = SPOE_EV_ON_TCP_RSP;

		else if (!strcmp(args[1], spoe_event_str[SPOE_EV_ON_HTTP_REQ_FE]))
			curmsg->event = SPOE_EV_ON_HTTP_REQ_FE;
		else if (!strcmp(args[1], spoe_event_str[SPOE_EV_ON_HTTP_REQ_BE]))
			curmsg->event = SPOE_EV_ON_HTTP_REQ_BE;
		else if (!strcmp(args[1], spoe_event_str[SPOE_EV_ON_HTTP_RSP]))
			curmsg->event = SPOE_EV_ON_HTTP_RSP;
		else {
			Alert("parsing [%s:%d] : unkown event '%s'.\n",
			      file, linenum, args[1]);
			err_code |= ERR_ALERT | ERR_ABORT;
			goto out;
		}
	}
	else if (!*args[0]) {
		Alert("parsing [%s:%d] : unknown keyword '%s' in spoe-message section.\n",
		      file, linenum, args[0]);
		err_code |= ERR_ALERT | ERR_FATAL;
		goto out;
	}
 out:
	free(errmsg);
	return err_code;
}

/* Return -1 on error, else 0 */
static int
parse_spoe_flt(char **args, int *cur_arg, struct proxy *px,
                struct flt_conf *fconf, char **err, void *private)
{
	struct list backup_sections;
	struct spoe_config          *conf;
	struct spoe_message         *msg, *msgback;
	struct spoe_msg_placeholder *mp, *mpback;
	char                        *file = NULL, *engine = NULL;
	int                          ret, pos = *cur_arg + 1;

	conf = calloc(1, sizeof(*conf));
	if (conf == NULL) {
		memprintf(err, "%s: out of memory", args[*cur_arg]);
		goto error;
	}
	conf->proxy = px;

	while (*args[pos]) {
		if (!strcmp(args[pos], "config")) {
			if (!*args[pos+1]) {
				memprintf(err, "'%s' : '%s' option without value",
					  args[*cur_arg], args[pos]);
				goto error;
			}
			file = args[pos+1];
			pos += 2;
		}
		else if (!strcmp(args[pos], "engine")) {
			if (!*args[pos+1]) {
				memprintf(err, "'%s' : '%s' option without value",
					  args[*cur_arg], args[pos]);
				goto error;
			}
			engine = args[pos+1];
			pos += 2;
		}
		else {
			memprintf(err, "unknown keyword '%s'", args[pos]);
			goto error;
		}
	}
	if (file == NULL) {
		memprintf(err, "'%s' : missing config file", args[*cur_arg]);
		goto error;
	}

	/* backup sections and register SPOE sections */
	LIST_INIT(&backup_sections);
	cfg_backup_sections(&backup_sections);
	cfg_register_section("spoe-agent",   cfg_parse_spoe_agent);
	cfg_register_section("spoe-message", cfg_parse_spoe_message);

	/* Parse SPOE filter configuration file */
	curengine = engine;
	curproxy  = px;
	curagent  = NULL;
	curmsg    = NULL;
	ret = readcfgfile(file);
	curproxy = NULL;

	/* unregister SPOE sections and restore previous sections */
	cfg_unregister_sections();
	cfg_restore_sections(&backup_sections);

	if (ret == -1) {
		memprintf(err, "Could not open configuration file %s : %s",
			  file, strerror(errno));
		goto error;
	}
	if (ret & (ERR_ABORT|ERR_FATAL)) {
		memprintf(err, "Error(s) found in configuration file %s", file);
		goto error;
	}

	/* Check SPOE agent */
	if (curagent == NULL) {
		memprintf(err, "No SPOE agent found in file %s", file);
		goto error;
	}
	if (curagent->b.name == NULL) {
		memprintf(err, "No backend declared for SPOE agent '%s' declared at %s:%d",
			  curagent->id, curagent->conf.file, curagent->conf.line);
		goto error;
	}
	if (curagent->timeout.hello == TICK_ETERNITY ||
	    curagent->timeout.idle  == TICK_ETERNITY ||
	    curagent->timeout.ack   == TICK_ETERNITY) {
		Warning("Proxy '%s': missing timeouts for SPOE agent '%s' declare at %s:%d.\n"
			"   | While not properly invalid, you will certainly encounter various problems\n"
			"   | with such a configuration. To fix this, please ensure that all following\n"
			"   | timeouts are set to a non-zero value: 'hello', 'idle', 'ack'.\n",
			px->id, curagent->id, curagent->conf.file, curagent->conf.line);
	}
	if (curagent->var_pfx == NULL) {
		char *tmp = curagent->id;

		while (*tmp) {
			if (!isalnum(*tmp) && *tmp != '_' && *tmp != '.') {
				memprintf(err, "Invalid variable prefix '%s' for SPOE agent '%s' declared at %s:%d. "
					  "Use 'option var-prefix' to set it. Only [a-zA-Z0-9_.] chars are supported.\n",
					  curagent->id, curagent->id, curagent->conf.file, curagent->conf.line);
				goto error;
			}
			tmp++;
		}
		curagent->var_pfx = strdup(curagent->id);
	}

	if (LIST_ISEMPTY(&curmps)) {
		Warning("Proxy '%s': No message used by SPOE agent '%s' declared at %s:%d.\n",
			px->id, curagent->id, curagent->conf.file, curagent->conf.line);
		goto finish;
	}

	list_for_each_entry_safe(mp, mpback, &curmps, list) {
		list_for_each_entry_safe(msg, msgback, &curmsgs, list) {
			if (!strcmp(msg->id, mp->id)) {
				if ((px->cap & (PR_CAP_FE|PR_CAP_BE)) == (PR_CAP_FE|PR_CAP_BE)) {
					if (msg->event == SPOE_EV_ON_TCP_REQ_BE)
						msg->event = SPOE_EV_ON_TCP_REQ_FE;
					if (msg->event == SPOE_EV_ON_HTTP_REQ_BE)
						msg->event = SPOE_EV_ON_HTTP_REQ_FE;
				}
				if (!(px->cap & PR_CAP_FE) && (msg->event == SPOE_EV_ON_CLIENT_SESS ||
							       msg->event == SPOE_EV_ON_TCP_REQ_FE ||
							       msg->event == SPOE_EV_ON_HTTP_REQ_FE)) {
					Warning("Proxy '%s': frontend event used on a backend proxy at %s:%d.\n",
						px->id, msg->conf.file, msg->conf.line);
					goto next;
				}
				if (msg->event == SPOE_EV_NONE) {
					Warning("Proxy '%s': Ignore SPOE message without event at %s:%d.\n",
						px->id, msg->conf.file, msg->conf.line);
					goto next;
				}
				msg->agent = curagent;
				LIST_DEL(&msg->list);
				LIST_ADDQ(&curagent->messages[msg->event], &msg->list);
				goto next;
			}
		}
		memprintf(err, "SPOE agent '%s' try to use undefined SPOE message '%s' at %s:%d",
			  curagent->id, mp->id, curagent->conf.file, curagent->conf.line);
		goto error;
	  next:
		continue;
	}

 finish:
	conf->agent = curagent;
	list_for_each_entry_safe(mp, mpback, &curmps, list) {
		LIST_DEL(&mp->list);
		release_spoe_msg_placeholder(mp);
	}
	list_for_each_entry_safe(msg, msgback, &curmsgs, list) {
		Warning("Proxy '%s': Ignore unused SPOE messages '%s' declared at %s:%d.\n",
			px->id, msg->id, msg->conf.file, msg->conf.line);
		LIST_DEL(&msg->list);
		release_spoe_message(msg);
	}

	*cur_arg    = pos;
	fconf->ops  = &spoe_ops;
	fconf->conf = conf;
	return 0;

 error:
	release_spoe_agent(curagent);
	list_for_each_entry_safe(mp, mpback, &curmps, list) {
		LIST_DEL(&mp->list);
		release_spoe_msg_placeholder(mp);
	}
	list_for_each_entry_safe(msg, msgback, &curmsgs, list) {
		LIST_DEL(&msg->list);
		release_spoe_message(msg);
	}
	free(conf);
	return -1;
}


/* Declare the filter parser for "spoe" keyword */
static struct flt_kw_list flt_kws = { "SPOE", { }, {
		{ "spoe", parse_spoe_flt, NULL },
		{ NULL, NULL, NULL },
	}
};

__attribute__((constructor))
static void __spoe_init(void)
{
	flt_register_keywords(&flt_kws);

	LIST_INIT(&curmsgs);
	LIST_INIT(&curmps);
	pool2_spoe_ctx = create_pool("spoe_ctx", sizeof(struct spoe_context), MEM_F_SHARED);
}

__attribute__((destructor))
static void
__spoe_deinit(void)
{
	pool_destroy2(pool2_spoe_ctx);
}