/*
 * HTTP samples fetching
 *
 * Copyright 2000-2018 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 <sys/types.h>

#include <ctype.h>
#include <string.h>
#include <time.h>

#include <haproxy/api.h>
#include <haproxy/arg.h>
#include <haproxy/auth.h>
#include <haproxy/base64.h>
#include <haproxy/channel.h>
#include <haproxy/chunk.h>
#include <haproxy/check.h>
#include <haproxy/connection.h>
#include <haproxy/global.h>
#include <haproxy/h1.h>
#include <haproxy/h1_htx.h>
#include <haproxy/http.h>
#include <haproxy/http_ana.h>
#include <haproxy/http_fetch.h>
#include <haproxy/http_htx.h>
#include <haproxy/htx.h>
#include <haproxy/obj_type.h>
#include <haproxy/pool.h>
#include <haproxy/sample.h>
#include <haproxy/sc_strm.h>
#include <haproxy/stream.h>
#include <haproxy/log.h>
#include <haproxy/tools.h>
#include <haproxy/version.h>


/* this struct is used between calls to smp_fetch_hdr() or smp_fetch_cookie() */
static THREAD_LOCAL struct http_hdr_ctx static_http_hdr_ctx;
/* this is used to convert raw connection buffers to htx */
/* NOTE: For now, raw buffers cannot exceeds the standard size */
static THREAD_LOCAL struct buffer static_raw_htx_chunk;
static THREAD_LOCAL char *static_raw_htx_buf;

#define SMP_REQ_CHN(smp) (smp->strm ? &smp->strm->req : NULL)
#define SMP_RES_CHN(smp) (smp->strm ? &smp->strm->res : NULL)

#define SMP_REQ_SC(smp) (smp->strm ? smp->strm->scf : NULL)
#define SMP_RES_SC(smp) (smp->strm ? smp->strm->scb : NULL)

/* This function returns the static htx chunk, where raw connections get
 * converted to HTX as needed for samplxsing.
 */
struct buffer *get_raw_htx_chunk(void)
{
	chunk_reset(&static_raw_htx_chunk);
	return &static_raw_htx_chunk;
}

static int alloc_raw_htx_chunk_per_thread()
{
	static_raw_htx_buf = malloc(global.tune.bufsize);
	if (!static_raw_htx_buf)
		return 0;
	chunk_init(&static_raw_htx_chunk, static_raw_htx_buf, global.tune.bufsize);
	return 1;
}

static void free_raw_htx_chunk_per_thread()
{
	ha_free(&static_raw_htx_buf);
}

REGISTER_PER_THREAD_ALLOC(alloc_raw_htx_chunk_per_thread);
REGISTER_PER_THREAD_FREE(free_raw_htx_chunk_per_thread);

/*
 * Returns the data from Authorization header. Function may be called more
 * than once so data is stored in txn->auth_data. When no header is found
 * or auth method is unknown auth_method is set to HTTP_AUTH_WRONG to avoid
 * searching again for something we are unable to find anyway. However, if
 * the result if valid, the cache is not reused because we would risk to
 * have the credentials overwritten by another stream in parallel.
 * The caller is responsible for passing a sample with a valid stream/txn,
 * and a valid htx.
 */

static int get_http_auth(struct sample *smp, struct htx *htx)
{
	struct stream *s = smp->strm;
	struct http_txn *txn = s->txn.http;
	struct http_hdr_ctx ctx = { .blk = NULL };
	struct ist hdr;
	struct buffer auth_method;
	char *p;
	int len;

#ifdef DEBUG_AUTH
	printf("Auth for stream %p: %d\n", s, txn->auth.method);
#endif
	if (txn->auth.method == HTTP_AUTH_WRONG)
		return 0;

	txn->auth.method = HTTP_AUTH_WRONG;

	if (txn->flags & TX_USE_PX_CONN)
		hdr = ist("Proxy-Authorization");
	else
		hdr = ist("Authorization");

	ctx.blk = NULL;
	if (!http_find_header(htx, hdr, &ctx, 0))
		return 0;

	p = memchr(ctx.value.ptr, ' ', ctx.value.len);
	if (!p || p == ctx.value.ptr) /* if no space was found or if the space is the first character */
		return 0;
	len = p - ctx.value.ptr;

	if (chunk_initlen(&auth_method, ctx.value.ptr, 0, len) != 1)
		return 0;

	/* According to RFC7235, there could be multiple spaces between the
	 * scheme and its value, we must skip all of them.
	 */
	while (p < istend(ctx.value) && *p == ' ')
		++p;

	chunk_initlen(&txn->auth.method_data, p, 0, istend(ctx.value) - p);

	if (!strncasecmp("Basic", auth_method.area, auth_method.data)) {
		struct buffer *http_auth = get_trash_chunk();

		len = base64dec(txn->auth.method_data.area,
				txn->auth.method_data.data,
				http_auth->area, http_auth->size -1);

		if (len < 0)
			return 0;


		http_auth->area[len] = '\0';

		p = strchr(http_auth->area, ':');

		if (!p)
			return 0;

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

		txn->auth.method = HTTP_AUTH_BASIC;
		return 1;
	} else if (!strncasecmp("Bearer", auth_method.area, auth_method.data)) {
		txn->auth.method = HTTP_AUTH_BEARER;
		return 1;
	}

	return 0;
}

/* This function ensures that the prerequisites for an L7 fetch are ready,
 * which means that a request or response is ready. If some data is missing,
 * a parsing attempt is made. This is useful in TCP-based ACLs which are able
 * to extract data from L7. If <vol> is non-null during a prefetch, another
 * test is made to ensure the required information is not gone.
 *
 * The function returns :
 *   NULL with SMP_F_MAY_CHANGE in the sample flags if some data is missing to
 *     decide whether or not an HTTP message is present ;
 *   NULL if the requested data cannot be fetched or if it is certain that
 *     we'll never have any HTTP message there; this includes null strm or chn.
 *   NULL if the sample's direction does not match the channel's (i.e. the
 *     function was asked to work on the wrong channel)
 *   The HTX message if ready
 */
struct htx *smp_prefetch_htx(struct sample *smp, struct channel *chn, struct check *check, int vol)
{
	struct stream *s = smp->strm;
	struct http_txn *txn = NULL;
	struct htx *htx = NULL;
	struct http_msg *msg;
	struct htx_sl *sl;

	if (chn &&
	    (((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_REQ && (chn->flags & CF_ISRESP)) ||
	     ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES && !(chn->flags & CF_ISRESP))))
		return 0;

	/* Note: it is possible that <s> is NULL when called before stream
	 * initialization (eg: tcp-request connection), so this function is the
	 * one responsible for guarding against this case for all HTTP users.
	 *
	 * In the health check context, the stream and the channel must be NULL
	 * and <check> must be set. In this case, only the input buffer,
	 * corresponding to the response, is considered. It is the caller
	 * responsibility to provide <check>.
	 */
	BUG_ON(check && (s || chn));
	if (!s || !chn) {
		if (check) {
			htx = htxbuf(&check->bi);

			/* Analyse not yet started */
			if (htx_is_empty(htx) || htx->first == -1)
				return NULL;

			sl = http_get_stline(htx);
			if (vol && !sl) {
				/* The start-line was already forwarded, it is too late to fetch anything */
				return NULL;
			}
			goto end;
		}

		return NULL;
	}

	if (!s->txn.http && !http_create_txn(s))
		return NULL;
	txn = s->txn.http;
	msg = (!(chn->flags & CF_ISRESP) ? &txn->req : &txn->rsp);

	if (IS_HTX_STRM(s)) {
		htx = htxbuf(&chn->buf);

		if (htx->flags & HTX_FL_PARSING_ERROR)
			return NULL;

		if (msg->msg_state < HTTP_MSG_BODY) {
			/* Analyse not yet started */
			if (htx_is_empty(htx) || htx->first == -1) {
				/* Parsing is done by the mux, just wait */
				smp->flags |= SMP_F_MAY_CHANGE;
				return NULL;
			}
		}
		sl = http_get_stline(htx);
		if (vol && !sl) {
			/* The start-line was already forwarded, it is too late to fetch anything */
			return NULL;
		}
	}
	else { /* RAW mode */
		struct buffer *buf;
		struct h1m h1m;
		struct http_hdr hdrs[global.tune.max_http_hdr];
		union h1_sl h1sl;
		unsigned int flags = HTX_FL_NONE;
		int ret;

		/* no HTTP fetch on the response in TCP mode */
		if (chn->flags & CF_ISRESP)
			return NULL;

		/* Now we are working on the request only */
		buf = &chn->buf;
		if (b_head(buf) + b_data(buf) > b_wrap(buf))
			b_slow_realign(buf, trash.area, 0);

		h1m_init_req(&h1m);
		ret = h1_headers_to_hdr_list(b_head(buf), b_stop(buf),
					     hdrs, sizeof(hdrs)/sizeof(hdrs[0]), &h1m, &h1sl);
		if (ret <= 0) {
			/* Invalid or too big*/
			if (ret < 0 || channel_full(&s->req, global.tune.maxrewrite))
				return NULL;

			/* wait for a full request */
			smp->flags |= SMP_F_MAY_CHANGE;
			return NULL;
		}

		/* OK we just got a valid HTTP message. We have to convert it
		 * into an HTX message.
		 */
		if (unlikely(h1sl.rq.v.len == 0)) {
			/* try to convert HTTP/0.9 requests to HTTP/1.0 */
			if (h1sl.rq.meth != HTTP_METH_GET || !h1sl.rq.u.len)
				return NULL;
			h1sl.rq.v = ist("HTTP/1.0");
		}

		/* Set HTX start-line flags */
		if (h1m.flags & H1_MF_VER_11)
			flags |= HTX_SL_F_VER_11;
		if (h1m.flags & H1_MF_XFER_ENC)
			flags |= HTX_SL_F_XFER_ENC;
		flags |= HTX_SL_F_XFER_LEN;
		if (h1m.flags & H1_MF_CHNK)
			flags |= HTX_SL_F_CHNK;
		else if (h1m.flags & H1_MF_CLEN)
			flags |= HTX_SL_F_CLEN;

		htx = htx_from_buf(get_raw_htx_chunk());
		sl = htx_add_stline(htx, HTX_BLK_REQ_SL, flags, h1sl.rq.m, h1sl.rq.u, h1sl.rq.v);
		if (!sl || !htx_add_all_headers(htx, hdrs))
			return NULL;
		sl->info.req.meth = h1sl.rq.meth;
	}

	/* OK we just got a valid HTTP message. If not already done by
	 * HTTP analyzers, we have some minor preparation to perform so
	 * that further checks can rely on HTTP tests.
	 */
	if (sl && msg->msg_state < HTTP_MSG_BODY) {
		struct ist vsn;

		if (!(chn->flags & CF_ISRESP)) {
			vsn = htx_sl_req_vsn(sl);
			txn->meth = sl->info.req.meth;
			if (txn->meth == HTTP_METH_GET || txn->meth == HTTP_METH_HEAD)
				s->flags |= SF_REDIRECTABLE;
		}
		else {
			vsn = htx_sl_res_vsn(sl);
			if (txn->status == -1)
				txn->status = sl->info.res.status;
			if (txn->server_status == -1)
				txn->server_status = sl->info.res.status;
		}

		if ((sl->flags & HTX_SL_F_NOT_HTTP) || istlen(vsn) != 8) {
			/* Not an HTTP message */
			msg->vsn = 0;
		}
		else {
			char *ptr = istptr(vsn);

			msg->vsn = ((ptr[5] - '0') << 4) + (ptr[7] - '0');
			if (sl->flags & HTX_SL_F_VER_11)
				msg->flags |= HTTP_MSGF_VER_11;
		}
	}

	/* everything's OK */
  end:
	return htx;
}

/* Get the HTTP version from <msg> or <htx> and append it into the chunk <chk>
 * with the format "<major>.<minor>".
 * It returns 0 if <msg> and <htx> are both NULL or if the version
 * is not a valid HTTP version. Otherwise, it returns 1 (success).
 *
 * The version is retrieved from <msg>, if not NULL. Otherwise, it is retrieved
 * from <htx>.
 */
static int get_msg_version(const struct http_msg *msg, const struct htx *htx, struct buffer *chk)
{
	if (msg) {
		if (msg->vsn) {
			chunk_appendf(chk, "%d.%d", (msg->vsn & 0xf0) >> 4, msg->vsn & 0xf);
			return 1;
		}
	}
	else if (htx) {
		struct htx_sl *sl = http_get_stline(htx);
		struct ist vsn = htx_sl_vsn(sl);

		if (!(sl->flags & HTX_SL_F_NOT_HTTP) && istlen(vsn) == 8) {
			chunk_appendf(chk, "%d.%d", istptr(vsn)[5] - '0',  istptr(vsn)[7] - '0');
			return 1;
		}
	}

	/* <msg> and <htx> are both NULL or not a valid HTTP version */
	return 0;
}


/* This function fetches the method of current HTTP request and stores
 * it in the global pattern struct as a chunk. There are two possibilities :
 *   - if the method is known (not HTTP_METH_OTHER), its identifier is stored
 *     in <len> and <ptr> is NULL ;
 *   - if the method is unknown (HTTP_METH_OTHER), <ptr> points to the text and
 *     <len> to its length.
 * This is intended to be used with pat_match_meth() only.
 */
static int smp_fetch_meth(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct http_txn *txn;
	struct htx *htx = NULL;
	int meth;

	txn = (smp->strm ? smp->strm->txn.http : NULL);
	if (!txn)
		return 0;

	meth = txn->meth;
	if (meth == HTTP_METH_OTHER) {
		htx = smp_prefetch_htx(smp, chn, NULL, 1);
		if (!htx)
			return 0;
		meth = txn->meth;
	}

	smp->data.type = SMP_T_METH;
	smp->data.u.meth.meth = meth;
	if (meth == HTTP_METH_OTHER) {
		struct htx_sl *sl;

		sl = http_get_stline(htx);
		smp->flags |= SMP_F_CONST;
		smp->data.u.meth.str.area = HTX_SL_REQ_MPTR(sl);
		smp->data.u.meth.str.data = HTX_SL_REQ_MLEN(sl);
	}
	smp->flags |= SMP_F_VOL_1ST;
	return 1;
}

static int smp_fetch_rqver(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct stream *s = smp->strm;
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct buffer *vsn = get_trash_chunk();

	if (!get_msg_version((s && s->txn.http) ? &s->txn.http->req : NULL, htx, vsn))
		return 0;

	smp->data.type = SMP_T_STR;
	smp->data.u.str = *vsn;
	return 1;
}

static int smp_fetch_stver(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct stream *s = smp->strm;
	struct channel *chn = SMP_RES_CHN(smp);
	struct check *check = objt_check(smp->sess->origin);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct buffer *vsn = get_trash_chunk();

	if (!get_msg_version((s && s->txn.http) ? &s->txn.http->rsp : NULL, htx, vsn))
		return 0;

	smp->data.type = SMP_T_STR;
	smp->data.u.str = *vsn;
	return 1;

	return 1;
}

/* 3. Check on Status Code. We manipulate integers here. */
static int smp_fetch_stcode(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_RES_CHN(smp);
	struct check *check = objt_check(smp->sess->origin);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct htx_sl *sl;
	char *ptr;
	int len;

	if (!htx)
		return 0;

	sl = http_get_stline(htx);
	len = HTX_SL_RES_CLEN(sl);
	ptr = HTX_SL_RES_CPTR(sl);

	smp->data.type = SMP_T_SINT;
	smp->data.u.sint = __strl2ui(ptr, len);
	smp->flags = SMP_F_VOL_1ST;
	return 1;
}

/* It returns the server or the txn status code, depending on the keyword */
static int smp_fetch_srv_status(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct http_txn *txn;
	short status;

	txn = (smp->strm ? smp->strm->txn.http : NULL);
	if (!txn)
		return 0;

	status = (kw[0] == 't' ? txn->status : txn->server_status);
	if (status == -1) {
		struct channel *chn = SMP_RES_CHN(smp);
		struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);

		if (!htx)
			return 0;

		status = (kw[0] == 't' ? txn->status : txn->server_status);
	}

	if (kw[0] != 't')
		smp->flags = SMP_F_VOL_1ST;
	smp->data.type = SMP_T_SINT;
	smp->data.u.sint = status;
	return 1;
}

static int smp_fetch_uniqueid(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct ist unique_id;
	struct check *check;

	if (smp->strm) {
		if (lf_expr_isempty(&smp->sess->fe->format_unique_id))
			return 0;

		unique_id = stream_generate_unique_id(smp->strm, &smp->sess->fe->format_unique_id);
	} else if ((check = objt_check(smp->sess->origin)) != NULL) {
		if (lf_expr_isempty(&check->proxy->format_unique_id))
			return 0;

		unique_id = check_generate_unique_id(check, &check->proxy->format_unique_id);
	} else {
		return 0;
	}

	if (!isttest(unique_id))
		return 0;

	smp->data.u.str.area = istptr(unique_id);
	smp->data.u.str.data = istlen(unique_id);
	smp->data.type = SMP_T_STR;
	smp->flags = SMP_F_CONST;
	return 1;
}

/* Returns a string block containing all headers including the
 * empty line which separates headers from the body. This is useful
 * for some headers analysis.
 */
static int smp_fetch_hdrs(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.hdrs, res.hdrs */
	struct channel *chn = ((kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct buffer *temp;
	int32_t pos;

	if (!htx)
		return 0;
	temp = get_trash_chunk();
	for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
		struct htx_blk *blk = htx_get_blk(htx, pos);
		enum htx_blk_type type = htx_get_blk_type(blk);

		if (type == HTX_BLK_HDR) {
			struct ist n = htx_get_blk_name(htx, blk);
			struct ist v = htx_get_blk_value(htx, blk);

			if (!h1_format_htx_hdr(n, v, temp))
				return 0;
		}
		else if (type == HTX_BLK_EOH) {
			if (!chunk_memcat(temp, "\r\n", 2))
				return 0;
			break;
		}
	}
	smp->data.type = SMP_T_STR;
	smp->data.u.str = *temp;
	return 1;
}

/* Returns the header request in a length/value encoded format.
 * This is useful for exchanges with the SPOE.
 *
 * A "length value" is a multibyte code encoding numbers. It uses the
 * SPOE format. The encoding is the following:
 *
 * Each couple "header name" / "header value" is composed
 * like this:
 *    "length value" "header name bytes"
 *    "length value" "header value bytes"
 * When the last header is reached, the header name and the header
 * value are empty. Their length are 0
 */
static int smp_fetch_hdrs_bin(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.hdrs_bin, res.hdrs_bin */
	struct channel *chn = ((kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct buffer *temp;
	char *p, *end;
	int32_t pos;
	int ret;

	if (!htx)
		return 0;
	temp = get_trash_chunk();
	p = temp->area;
	end = temp->area + temp->size;
	for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
		struct htx_blk *blk = htx_get_blk(htx, pos);
		enum htx_blk_type type = htx_get_blk_type(blk);
		struct ist n, v;

		if (type == HTX_BLK_HDR) {
			n = htx_get_blk_name(htx,blk);
			v = htx_get_blk_value(htx, blk);

			/* encode the header name. */
			ret = encode_varint(n.len, &p, end);
			if (ret == -1)
				return 0;
			if (p + n.len > end)
				return 0;
			memcpy(p, n.ptr, n.len);
			p += n.len;

			/* encode the header value. */
			ret = encode_varint(v.len, &p, end);
			if (ret == -1)
				return 0;
			if (p + v.len > end)
				return 0;
			memcpy(p, v.ptr, v.len);
			p += v.len;

		}
		else if (type == HTX_BLK_EOH) {
			/* encode the end of the header list with empty
			 * header name and header value.
			 */
			ret = encode_varint(0, &p, end);
			if (ret == -1)
				return 0;
			ret = encode_varint(0, &p, end);
			if (ret == -1)
				return 0;
			break;
		}
	}

	/* Initialise sample data which will be filled. */
	smp->data.type = SMP_T_BIN;
	smp->data.u.str.area = temp->area;
	smp->data.u.str.data = p - temp->area;
	smp->data.u.str.size = temp->size;
	return 1;
}

/* returns the longest available part of the body. This requires that the body
 * has been waited for using http-buffer-request.
 */
static int smp_fetch_body(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.body, res.body */
	struct channel *chn = ((kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct buffer *chk = NULL;
	struct ist body = IST_NULL;
	int32_t pos;
	int finished = 0;

	if (!htx)
		return 0;

	if ((htx->flags & (HTX_FL_FRAGMENTED|HTX_FL_UNORDERED)) || htx_space_wraps(htx))
		htx_defrag(htx, NULL, 0);

	for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
		struct htx_blk *blk = htx_get_blk(htx, pos);
		enum htx_blk_type type = htx_get_blk_type(blk);

		if (type == HTX_BLK_TLR || type == HTX_BLK_EOT) {
			finished = 1;
			break;
		}
		if (type == HTX_BLK_DATA) {
			if (isttest(body)) {
				/* More than one DATA block we must use a trash */
				if (!chk) {
					smp->flags &= ~SMP_F_CONST;
					chk = get_trash_chunk_sz(htx->data);
					chunk_istcat(chk, body);
				}
				chunk_istcat(chk, htx_get_blk_value(htx, blk));
				body = ist2(b_orig(chk), b_data(chk));
			}
			else {
				body = htx_get_blk_value(htx, blk);
				smp->flags |= SMP_F_CONST;
			}
		}
	}

	smp->data.type = SMP_T_BIN;
	smp->data.u.str.area = istptr(body);
	smp->data.u.str.data = istlen(body);
	smp->flags |= SMP_F_VOL_TEST;

	if (!finished && (check || (chn && !channel_full(chn, global.tune.maxrewrite) &&
				    !(chn_prod(chn)->flags & (SC_FL_EOI|SC_FL_EOS|SC_FL_ABRT_DONE)))))
		smp->flags |= SMP_F_MAY_CHANGE;

	return 1;
}


/* returns the available length of the body. This requires that the body
 * has been waited for using http-buffer-request.
 */
static int smp_fetch_body_len(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.body_len, res.body_len */
	struct channel *chn = ((kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	int32_t pos;
	unsigned long long len = 0;

	if (!htx)
		return 0;

	for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
		struct htx_blk *blk = htx_get_blk(htx, pos);
		enum htx_blk_type type = htx_get_blk_type(blk);

		if (type == HTX_BLK_TLR || type == HTX_BLK_EOT)
			break;
		if (type == HTX_BLK_DATA)
			len += htx_get_blksz(blk);
	}

	smp->data.type = SMP_T_SINT;
	smp->data.u.sint = len;
	smp->flags = SMP_F_VOL_TEST;
	return 1;
}


/* returns the advertised length of the body, or the advertised size of the
 * chunks available in the buffer. This requires that the body has been waited
 * for using http-buffer-request.
 */
static int smp_fetch_body_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.body_size, res.body_size */
	struct stconn *sc = ((kw[2] == 'q') ? SMP_REQ_SC(smp) : SMP_RES_SC(smp));
	struct check *check = ((kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, (sc ? sc_ic(sc) : NULL), check, 1);
	unsigned long long len = 0;

	if (!htx)
		return 0;
	len = (sc ? sc->sedesc->kip : check->sc->sedesc->kip);

	smp->data.type = SMP_T_SINT;
	smp->data.u.sint = len;
	smp->flags = SMP_F_VOL_TEST;
	return 1;
}


/* 4. Check on URL/URI. A pointer to the URI is stored. */
static int smp_fetch_url(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct htx_sl *sl;

	if (!htx)
		return 0;
	sl = http_get_stline(htx);
	smp->data.type = SMP_T_STR;
	smp->data.u.str.area = HTX_SL_REQ_UPTR(sl);
	smp->data.u.str.data = HTX_SL_REQ_ULEN(sl);
	smp->flags = SMP_F_VOL_1ST | SMP_F_CONST;
	return 1;
}

static int smp_fetch_url_ip(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct htx_sl *sl;
	struct sockaddr_storage addr;

	memset(&addr, 0, sizeof(addr));

	if (!htx)
		return 0;
	sl = http_get_stline(htx);
	if (url2sa(HTX_SL_REQ_UPTR(sl), HTX_SL_REQ_ULEN(sl), &addr, NULL) < 0)
		return 0;

	if (addr.ss_family != AF_INET)
		return 0;

	smp->data.type = SMP_T_IPV4;
	smp->data.u.ipv4 = ((struct sockaddr_in *)&addr)->sin_addr;
	smp->flags = 0;
	return 1;
}

static int smp_fetch_url_port(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct htx_sl *sl;
	struct sockaddr_storage addr;

	memset(&addr, 0, sizeof(addr));

	if (!htx)
		return 0;
	sl = http_get_stline(htx);
	if (url2sa(HTX_SL_REQ_UPTR(sl), HTX_SL_REQ_ULEN(sl), &addr, NULL) < 0)
		return 0;

	if (addr.ss_family != AF_INET)
		return 0;

	smp->data.type = SMP_T_SINT;
	smp->data.u.sint = get_host_port(&addr);
	smp->flags = 0;
	return 1;
}

/* Fetch an HTTP header. A pointer to the beginning of the value is returned.
 * Accepts an optional argument of type string containing the header field name,
 * and an optional argument of type signed or unsigned integer to request an
 * explicit occurrence of the header. Note that in the event of a missing name,
 * headers are considered from the first one. It does not stop on commas and
 * returns full lines instead (useful for User-Agent or Date for example).
 */
static int smp_fetch_fhdr(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.fhdr, res.fhdr */
	struct channel *chn = ((kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct http_hdr_ctx *ctx = smp->ctx.a[0];
	struct ist name;
	int occ = 0;

	if (!ctx) {
		/* first call */
		ctx = &static_http_hdr_ctx;
		ctx->blk = NULL;
		smp->ctx.a[0] = ctx;
	}

	if (args[0].type != ARGT_STR)
		return 0;
	name = ist2(args[0].data.str.area, args[0].data.str.data);

	if (args[1].type == ARGT_SINT)
		occ = args[1].data.sint;

	if (!htx)
		return 0;

	if (ctx && !(smp->flags & SMP_F_NOT_LAST))
		/* search for header from the beginning */
		ctx->blk = NULL;

	if (!occ && !(smp->opt & SMP_OPT_ITERATE))
		/* no explicit occurrence and single fetch => last header by default */
		occ = -1;

	if (!occ)
		/* prepare to report multiple occurrences for ACL fetches */
		smp->flags |= SMP_F_NOT_LAST;

	smp->data.type = SMP_T_STR;
	smp->flags |= SMP_F_VOL_HDR | SMP_F_CONST;
	if (http_get_htx_fhdr(htx, name, occ, ctx, &smp->data.u.str.area, &smp->data.u.str.data))
		return 1;
	smp->flags &= ~SMP_F_NOT_LAST;
	return 0;
}

/* 6. Check on HTTP header count. The number of occurrences is returned.
 * Accepts exactly 1 argument of type string. It does not stop on commas and
 * returns full lines instead (useful for User-Agent or Date for example).
 */
static int smp_fetch_fhdr_cnt(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.fhdr_cnt, res.fhdr_cnt */
	struct channel *chn = ((kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct http_hdr_ctx ctx;
	struct ist name;
	int cnt;

	if (!htx)
		return 0;

	if (args->type == ARGT_STR) {
		name = ist2(args->data.str.area, args->data.str.data);
	} else {
		name = IST_NULL;
	}

	ctx.blk = NULL;
	cnt = 0;
	while (http_find_header(htx, name, &ctx, 1))
		cnt++;
	smp->data.type = SMP_T_SINT;
	smp->data.u.sint = cnt;
	smp->flags = SMP_F_VOL_HDR;
	return 1;
}

static int smp_fetch_hdr_names(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.hdr_names, res.hdr_names */
	struct channel *chn = ((kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct buffer *temp;
	char del = ',';

	int32_t pos;

	if (!htx)
		return 0;

	if (args->type == ARGT_STR)
		del = *args[0].data.str.area;

	temp = get_trash_chunk();
	for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
		struct htx_blk *blk = htx_get_blk(htx, pos);
		enum htx_blk_type type = htx_get_blk_type(blk);
		struct ist n;

		if (type == HTX_BLK_EOH)
			break;
		if (type != HTX_BLK_HDR)
			continue;
		n = htx_get_blk_name(htx, blk);

		if (temp->data)
			temp->area[temp->data++] = del;
		chunk_istcat(temp, n);
	}

	smp->data.type = SMP_T_STR;
	smp->data.u.str = *temp;
	smp->flags = SMP_F_VOL_HDR;
	return 1;
}

/* Fetch an HTTP header. A pointer to the beginning of the value is returned.
 * Accepts an optional argument of type string containing the header field name,
 * and an optional argument of type signed or unsigned integer to request an
 * explicit occurrence of the header. Note that in the event of a missing name,
 * headers are considered from the first one.
 */
static int smp_fetch_hdr(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.hdr / hdr, res.hdr / shdr */
	struct channel *chn = ((kw[0] == 'h' || kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[0] == 's' || kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct http_hdr_ctx *ctx = smp->ctx.a[0];
	struct ist name;
	int occ = 0;

	if (!ctx) {
		/* first call */
		ctx = &static_http_hdr_ctx;
		ctx->blk = NULL;
		smp->ctx.a[0] = ctx;
	}

	if (args[0].type != ARGT_STR)
		return 0;
	name = ist2(args[0].data.str.area, args[0].data.str.data);

	if (args[1].type == ARGT_SINT)
		occ = args[1].data.sint;

	if (!htx)
		return 0;

	if (ctx && !(smp->flags & SMP_F_NOT_LAST))
		/* search for header from the beginning */
		ctx->blk = NULL;

	if (!occ && !(smp->opt & SMP_OPT_ITERATE))
		/* no explicit occurrence and single fetch => last header by default */
		occ = -1;

	if (!occ)
		/* prepare to report multiple occurrences for ACL fetches */
		smp->flags |= SMP_F_NOT_LAST;

	smp->data.type = SMP_T_STR;
	smp->flags |= SMP_F_VOL_HDR | SMP_F_CONST;
	if (http_get_htx_hdr(htx, name, occ, ctx, &smp->data.u.str.area, &smp->data.u.str.data))
		return 1;

	smp->flags &= ~SMP_F_NOT_LAST;
	return 0;
}

/* Same than smp_fetch_hdr() but only relies on the sample direction to choose
 * the right channel. So instead of duplicating the code, we just change the
 * keyword and then fallback on smp_fetch_hdr().
 */
static int smp_fetch_chn_hdr(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	kw = ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_REQ ? "req.hdr" : "res.hdr");
	return smp_fetch_hdr(args, smp, kw, private);
}

/* 6. Check on HTTP header count. The number of occurrences is returned.
 * Accepts exactly 1 argument of type string.
 */
static int smp_fetch_hdr_cnt(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.hdr_cnt / hdr_cnt, res.hdr_cnt / shdr_cnt */
	struct channel *chn = ((kw[0] == 'h' || kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[0] == 's' || kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct http_hdr_ctx ctx;
	struct ist name;
	int cnt;

	if (!htx)
		return 0;

	if (args->type == ARGT_STR) {
		name = ist2(args->data.str.area, args->data.str.data);
	} else {
		name = IST_NULL;
	}

	ctx.blk = NULL;
	cnt = 0;
	while (http_find_header(htx, name, &ctx, 0))
		cnt++;

	smp->data.type = SMP_T_SINT;
	smp->data.u.sint = cnt;
	smp->flags = SMP_F_VOL_HDR;
	return 1;
}

/* Fetch an HTTP header's integer value. The integer value is returned. It
 * takes a mandatory argument of type string and an optional one of type int
 * to designate a specific occurrence. It returns an unsigned integer, which
 * may or may not be appropriate for everything.
 */
static int smp_fetch_hdr_val(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	int ret = smp_fetch_hdr(args, smp, kw, private);

	if (ret > 0) {
		smp->data.type = SMP_T_SINT;
		smp->data.u.sint = strl2ic(smp->data.u.str.area,
					   smp->data.u.str.data);
	}

	return ret;
}

/* Fetch an HTTP header's IP value. takes a mandatory argument of type string
 * and an optional one of type int to designate a specific occurrence.
 * It returns an IPv4 or IPv6 address. Addresses surrounded by invalid chars
 * are rejected. However IPv4 addresses may be followed with a colon and a
 * valid port number.
 */
static int smp_fetch_hdr_ip(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct buffer *temp = get_trash_chunk();
	int ret, len;
	int port;

	while ((ret = smp_fetch_hdr(args, smp, kw, private)) > 0) {
		if (smp->data.u.str.data < temp->size - 1) {
			memcpy(temp->area, smp->data.u.str.area,
			       smp->data.u.str.data);
			temp->area[smp->data.u.str.data] = '\0';
			len = url2ipv4((char *) temp->area, &smp->data.u.ipv4);
			if (len > 0 && len == smp->data.u.str.data) {
				/* plain IPv4 address */
				smp->data.type = SMP_T_IPV4;
				break;
			} else if (len > 0 && temp->area[len] == ':' &&
				   strl2irc(temp->area + len + 1, smp->data.u.str.data - len - 1, &port) == 0 &&
				   port >= 0 && port <= 65535) {
				/* IPv4 address suffixed with ':' followed by a valid port number */
				smp->data.type = SMP_T_IPV4;
				break;
			} else if (temp->area[0] == '[' && temp->area[smp->data.u.str.data-1] == ']') {
				/* IPv6 address enclosed in square brackets */
				temp->area[smp->data.u.str.data-1] = '\0';
				if (inet_pton(AF_INET6, temp->area+1, &smp->data.u.ipv6)) {
					smp->data.type = SMP_T_IPV6;
					break;
				}
			} else if (inet_pton(AF_INET6, temp->area, &smp->data.u.ipv6)) {
				/* plain IPv6 address */
				smp->data.type = SMP_T_IPV6;
				break;
			}
		}

		/* if the header doesn't match an IP address, fetch next one */
		if (!(smp->flags & SMP_F_NOT_LAST))
			return 0;
	}
	return ret;
}

/* 8. Check on URI PATH. A pointer to the PATH is stored. The path starts at the
 * first '/' after the possible hostname. It ends before the possible '?' except
 * for 'pathq' keyword.
 */
static int smp_fetch_path(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct htx_sl *sl;
	struct ist path;
	struct http_uri_parser parser;

	if (!htx)
		return 0;

	sl = http_get_stline(htx);
	parser = http_uri_parser_init(htx_sl_req_uri(sl));

	if (kw[4] == 'q' && (kw[0] == 'p' || kw[0] == 'b')) // pathq or baseq
		path = http_parse_path(&parser);
	else
		path = iststop(http_parse_path(&parser), '?');

	if (!isttest(path))
		return 0;

	/* OK, we got the '/' ! */
	smp->data.type = SMP_T_STR;
	smp->data.u.str.area = path.ptr;
	smp->data.u.str.data = path.len;
	smp->flags = SMP_F_VOL_1ST | SMP_F_CONST;
	return 1;
}

/* This produces a concatenation of the first occurrence of the Host header
 * followed by the path component if it begins with a slash ('/'). This means
 * that '*' will not be added, resulting in exactly the first Host entry.
 * If no Host header is found, then the path is returned as-is. The returned
 * value is stored in the trash so it does not need to be marked constant.
 * The returned sample is of type string.
 */
static int smp_fetch_base(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct htx_sl *sl;
	struct buffer *temp;
	struct http_hdr_ctx ctx;
	struct ist path;
	struct http_uri_parser parser;

	if (!htx)
		return 0;

	ctx.blk = NULL;
	if (!http_find_header(htx, ist("Host"), &ctx, 0) || !ctx.value.len)
		return smp_fetch_path(args, smp, kw, private);

	/* OK we have the header value in ctx.value */
	temp = get_trash_chunk();
	chunk_istcat(temp, ctx.value);

	/* now retrieve the path */
	sl = http_get_stline(htx);
	parser = http_uri_parser_init(htx_sl_req_uri(sl));
	path = http_parse_path(&parser);
	if (isttest(path)) {
		size_t len;

		if (kw[4] == 'q' && kw[0] == 'b') { // baseq
			len = path.len;
		} else {
			for (len = 0; len < path.len && *(path.ptr + len) != '?'; len++)
				;
		}

		if (len && *(path.ptr) == '/')
			chunk_memcat(temp, path.ptr, len);
	}

	smp->data.type = SMP_T_STR;
	smp->data.u.str = *temp;
	smp->flags = SMP_F_VOL_1ST;
	return 1;
}

/* This produces a 32-bit hash of the concatenation of the first occurrence of
 * the Host header followed by the path component if it begins with a slash ('/').
 * This means that '*' will not be added, resulting in exactly the first Host
 * entry. If no Host header is found, then the path is used. The resulting value
 * is hashed using the path hash followed by a full avalanche hash and provides a
 * 32-bit integer value. This fetch is useful for tracking per-path activity on
 * high-traffic sites without having to store whole paths.
 */
static int smp_fetch_base32(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct htx_sl *sl;
	struct http_hdr_ctx ctx;
	struct ist path;
	unsigned int hash = 0;
	struct http_uri_parser parser;

	if (!htx)
		return 0;

	ctx.blk = NULL;
	if (http_find_header(htx, ist("Host"), &ctx, 0)) {
		/* OK we have the header value in ctx.value */
		while (ctx.value.len--)
			hash = *(ctx.value.ptr++) + (hash << 6) + (hash << 16) - hash;
	}

	/* now retrieve the path */
	sl = http_get_stline(htx);
	parser = http_uri_parser_init(htx_sl_req_uri(sl));
	path = http_parse_path(&parser);
	if (isttest(path)) {
		size_t len;

		for (len = 0; len < path.len && *(path.ptr + len) != '?'; len++)
			;

		if (len && *(path.ptr) == '/') {
			while (len--)
				hash = *(path.ptr++) + (hash << 6) + (hash << 16) - hash;
		}
	}

	hash = full_hash(hash);

	smp->data.type = SMP_T_SINT;
	smp->data.u.sint = hash;
	smp->flags = SMP_F_VOL_1ST;
	return 1;
}

/* This concatenates the source address with the 32-bit hash of the Host and
 * path as returned by smp_fetch_base32(). The idea is to have per-source and
 * per-path counters. The result is a binary block from 8 to 20 bytes depending
 * on the source address length. The path hash is stored before the address so
 * that in environments where IPv6 is insignificant, truncating the output to
 * 8 bytes would still work.
 */
static int smp_fetch_base32_src(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	const struct sockaddr_storage *src = (smp->strm ? sc_src(smp->strm->scf) : NULL);
	struct buffer *temp;

	if (!src)
		return 0;

	if (!smp_fetch_base32(args, smp, kw, private))
		return 0;

	temp = get_trash_chunk();
	*(unsigned int *) temp->area = htonl(smp->data.u.sint);
	temp->data += sizeof(unsigned int);

	switch (src->ss_family) {
	case AF_INET:
		memcpy(temp->area + temp->data,
		       &((struct sockaddr_in *)src)->sin_addr,
		       4);
		temp->data += 4;
		break;
	case AF_INET6:
		memcpy(temp->area + temp->data,
		       &((struct sockaddr_in6 *)src)->sin6_addr,
		       16);
		temp->data += 16;
		break;
	default:
		return 0;
	}

	smp->data.u.str = *temp;
	smp->data.type = SMP_T_BIN;
	return 1;
}

/* Extracts the query string, which comes after the question mark '?'. If no
 * question mark is found, nothing is returned. Otherwise it returns a sample
 * of type string carrying the whole query string.
 */
static int smp_fetch_query(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct htx_sl *sl;
	char *ptr, *end;

	if (!htx)
		return 0;

	sl = http_get_stline(htx);
	ptr = HTX_SL_REQ_UPTR(sl);
	end = HTX_SL_REQ_UPTR(sl) + HTX_SL_REQ_ULEN(sl);

	/* look up the '?' */
	do {
		if (ptr == end)
			return 0;
	} while (*ptr++ != '?');

	if (ptr != end && args[0].type == ARGT_SINT && args[0].data.sint == 1)
		ptr--;

	smp->data.type = SMP_T_STR;
	smp->data.u.str.area = ptr;
	smp->data.u.str.data = end - ptr;
	smp->flags = SMP_F_VOL_1ST | SMP_F_CONST;
	return 1;
}

static int smp_fetch_proto_http(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 0);

	if (!htx)
		return 0;
	smp->data.type = SMP_T_BOOL;
	smp->data.u.sint = 1;
	return 1;
}

/* return a valid test if the current request is the first one on the connection */
static int smp_fetch_http_first_req(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	if (!smp->strm)
		return 0;

	smp->data.type = SMP_T_BOOL;
	smp->data.u.sint = !(smp->strm->txn.http->flags & TX_NOT_FIRST);
	return 1;
}

/* Fetch the authentication method if there is an Authorization header. It
 * relies on get_http_auth()
 */
static int smp_fetch_http_auth_type(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct http_txn *txn;

	if (!htx)
		return 0;

	txn = smp->strm->txn.http;
	if (!get_http_auth(smp, htx))
		return 0;

	switch (txn->auth.method) {
		case HTTP_AUTH_BASIC:
			smp->data.u.str.area = "Basic";
			smp->data.u.str.data = 5;
			break;
		case HTTP_AUTH_DIGEST:
			/* Unexpected because not supported */
			smp->data.u.str.area = "Digest";
			smp->data.u.str.data = 6;
			break;
		case HTTP_AUTH_BEARER:
			smp->data.u.str.area = "Bearer";
			smp->data.u.str.data = 6;
			break;
		default:
			return 0;
	}

	smp->data.type = SMP_T_STR;
	smp->flags = SMP_F_CONST;
	return 1;
}

/* Fetch the user supplied if there is an Authorization header. It relies on
 * get_http_auth()
 */
static int smp_fetch_http_auth_user(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct http_txn *txn;

	if (!htx)
		return 0;

	txn = smp->strm->txn.http;
	if (!get_http_auth(smp, htx) || txn->auth.method != HTTP_AUTH_BASIC)
		return 0;

	smp->data.type = SMP_T_STR;
	smp->data.u.str.area = txn->auth.user;
	smp->data.u.str.data = strlen(txn->auth.user);
	smp->flags = SMP_F_CONST;
	return 1;
}

/* Fetch the password supplied if there is an Authorization header. It relies on
 * get_http_auth()
 */
static int smp_fetch_http_auth_pass(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct http_txn *txn;

	if (!htx)
		return 0;

	txn = smp->strm->txn.http;
	if (!get_http_auth(smp, htx) || txn->auth.method != HTTP_AUTH_BASIC)
		return 0;

	smp->data.type = SMP_T_STR;
	smp->data.u.str.area = txn->auth.pass;
	smp->data.u.str.data = strlen(txn->auth.pass);
	smp->flags = SMP_F_CONST;
	return 1;
}

static int smp_fetch_http_auth_bearer(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct http_txn *txn;
	struct buffer bearer_val = {};

	if (!htx)
		return 0;

	if (args->type == ARGT_STR) {
		struct http_hdr_ctx ctx;
		struct ist hdr_name = ist2(args->data.str.area, args->data.str.data);

		ctx.blk = NULL;
		if (http_find_header(htx, hdr_name, &ctx, 0)) {
			struct ist type = istsplit(&ctx.value, ' ');

			/* There must be "at least" one space character between
			 * the scheme and the following value so ctx.value might
			 * still have leading spaces here (see RFC7235).
			 */
			ctx.value = istskip(ctx.value, ' ');

			if (isteqi(type, ist("Bearer")) && istlen(ctx.value))
				chunk_initlen(&bearer_val, istptr(ctx.value), 0, istlen(ctx.value));
		}
	}
	else {
		txn = smp->strm->txn.http;
		if (!get_http_auth(smp, htx) || txn->auth.method != HTTP_AUTH_BEARER)
			return 0;

		bearer_val = txn->auth.method_data;
	}

	smp->data.type = SMP_T_STR;
	smp->data.u.str = bearer_val;
	smp->flags = SMP_F_CONST;
	return 1;
}

/* Accepts exactly 1 argument of type userlist */
static int smp_fetch_http_auth(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);

	if (args->type != ARGT_USR)
		return 0;

	if (!htx)
		return 0;
	if (!get_http_auth(smp, htx) || smp->strm->txn.http->auth.method != HTTP_AUTH_BASIC)
		return 0;

	smp->data.type = SMP_T_BOOL;
	smp->data.u.sint = check_user(args->data.usr, smp->strm->txn.http->auth.user,
				      smp->strm->txn.http->auth.pass);
	return 1;
}

/* Accepts exactly 1 argument of type userlist */
static int smp_fetch_http_auth_grp(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);

	if (args->type != ARGT_USR)
		return 0;

	if (!htx)
		return 0;
	if (!get_http_auth(smp, htx) || smp->strm->txn.http->auth.method != HTTP_AUTH_BASIC)
		return 0;

	/* if the user does not belong to the userlist or has a wrong password,
	 * report that it unconditionally does not match. Otherwise we return
	 * a string containing the username.
	 */
	if (!check_user(args->data.usr, smp->strm->txn.http->auth.user,
	                smp->strm->txn.http->auth.pass))
		return 0;

	/* pat_match_auth() will need the user list */
	smp->ctx.a[0] = args->data.usr;

	smp->data.type = SMP_T_STR;
	smp->flags = SMP_F_CONST;
	smp->data.u.str.area = smp->strm->txn.http->auth.user;
	smp->data.u.str.data = strlen(smp->strm->txn.http->auth.user);

	return 1;
}

/* Fetch a captured HTTP request header. The index is the position of
 * the "capture" option in the configuration file
 */
static int smp_fetch_capture_req_hdr(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct proxy *fe;
	int idx;

	if (args->type != ARGT_SINT)
		return 0;

	if (!smp->strm)
		return 0;

	fe = strm_fe(smp->strm);
	idx = args->data.sint;

	if (idx > (fe->nb_req_cap - 1) || smp->strm->req_cap == NULL || smp->strm->req_cap[idx] == NULL)
		return 0;

	smp->data.type = SMP_T_STR;
	smp->flags |= SMP_F_CONST;
	smp->data.u.str.area = smp->strm->req_cap[idx];
	smp->data.u.str.data = strlen(smp->strm->req_cap[idx]);

	return 1;
}

/* Fetch a captured HTTP response header. The index is the position of
 * the "capture" option in the configuration file
 */
static int smp_fetch_capture_res_hdr(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct proxy *fe;
	int idx;

	if (args->type != ARGT_SINT)
		return 0;

	if (!smp->strm)
		return 0;

	fe = strm_fe(smp->strm);
	idx = args->data.sint;

	if (idx > (fe->nb_rsp_cap - 1) || smp->strm->res_cap == NULL || smp->strm->res_cap[idx] == NULL)
		return 0;

	smp->data.type = SMP_T_STR;
	smp->flags |= SMP_F_CONST;
	smp->data.u.str.area = smp->strm->res_cap[idx];
	smp->data.u.str.data = strlen(smp->strm->res_cap[idx]);

	return 1;
}

/* Extracts the METHOD in the HTTP request, the txn->uri should be filled before the call */
static int smp_fetch_capture_req_method(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct buffer *temp;
	struct http_txn *txn;
	char *ptr;

	if (!smp->strm)
		return 0;

	txn = smp->strm->txn.http;
	if (!txn || !txn->uri)
		return 0;

	ptr = txn->uri;

	while (*ptr != ' ' && *ptr != '\0')  /* find first space */
		ptr++;

	temp = get_trash_chunk();
	temp->area = txn->uri;
	temp->data = ptr - txn->uri;
	smp->data.u.str = *temp;
	smp->data.type = SMP_T_STR;
	smp->flags = SMP_F_CONST;

	return 1;

}

/* Extracts the path in the HTTP request, the txn->uri should be filled before the call  */
static int smp_fetch_capture_req_uri(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct http_txn *txn;
	struct ist path;
	const char *ptr;
	struct http_uri_parser parser;

	if (!smp->strm)
		return 0;

	txn = smp->strm->txn.http;
	if (!txn || !txn->uri)
		return 0;

	ptr = txn->uri;

	while (*ptr != ' ' && *ptr != '\0')  /* find first space */
		ptr++;

	if (!*ptr)
		return 0;

	/* skip the first space and find space after URI */
	path = ist2(++ptr, 0);
	while (*ptr != ' ' && *ptr != '\0')
		ptr++;
	path.len = ptr - path.ptr;

	parser = http_uri_parser_init(path);
	path = http_parse_path(&parser);
	if (!isttest(path))
		return 0;

	smp->data.u.str.area = path.ptr;
	smp->data.u.str.data = path.len;
	smp->data.type = SMP_T_STR;
	smp->flags = SMP_F_CONST;

	return 1;
}

/* Retrieves the HTTP version from the request (either 1.0 or 1.1) and emits it
 * as a string (either "HTTP/1.0" or "HTTP/1.1").
 */
static int smp_fetch_capture_req_ver(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct stream *s = smp->strm;
	struct buffer *vsn;

	vsn = get_trash_chunk();
	chunk_memcat(vsn, "HTTP/", 5);
	if (!get_msg_version((s && s->txn.http) ? &s->txn.http->req : NULL, NULL, vsn))
		return 0;

	smp->data.type = SMP_T_STR;
	smp->data.u.str = *vsn;
	return 1;
}

/* Retrieves the HTTP version from the response (either 1.0 or 1.1) and emits it
 * as a string (either "HTTP/1.0" or "HTTP/1.1").
 */
static int smp_fetch_capture_res_ver(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct stream *s = smp->strm;
	struct buffer *vsn;

	vsn = get_trash_chunk();
	chunk_memcat(vsn, "HTTP/", 5);
	if (!get_msg_version((s && s->txn.http) ? &s->txn.http->rsp : NULL, NULL, vsn))
		return 0;

	smp->data.type = SMP_T_STR;
	smp->data.u.str = *vsn;
	return 1;

}

/* Iterate over all cookies present in a message. The context is stored in
 * smp->ctx.a[0] for the in-header position, smp->ctx.a[1] for the
 * end-of-header-value, and smp->ctx.a[2] for the hdr_ctx. Depending on
 * the direction, multiple cookies may be parsed on the same line or not.
 * If provided, the searched cookie name is in args, in args->data.str. If
 * the input options indicate that no iterating is desired, then only last
 * value is fetched if any. If no cookie name is provided, the first cookie
 * value found is fetched. The returned sample is of type CSTR.  Can be used
 * to parse cookies in other files.
 */
static int smp_fetch_cookie(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.cookie / cookie / cook, res.cookie / scook / set-cookie */
	struct channel *chn = ((kw[0] == 'c' || kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[0] == 's' || kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct http_hdr_ctx *ctx = smp->ctx.a[2];
	struct ist hdr;
	char *cook = NULL;
	size_t cook_l = 0;
	int found = 0;

	if (args->type == ARGT_STR) {
		cook = args->data.str.area;
		cook_l = args->data.str.data;
	}

	if (!ctx) {
		/* first call */
		ctx = &static_http_hdr_ctx;
		ctx->blk = NULL;
		smp->ctx.a[2] = ctx;
	}

	if (!htx)
		return 0;

	hdr = (!(check || (chn && chn->flags & CF_ISRESP)) ? ist("Cookie") : ist("Set-Cookie"));

	/* OK so basically here, either we want only one value or we want to
	 * iterate over all of them and we fetch the next one. In this last case
	 * SMP_OPT_ITERATE option is set.
	 */

	if (!(smp->flags & SMP_F_NOT_LAST)) {
		/* search for the header from the beginning, we must first initialize
		 * the search parameters.
		 */
		smp->ctx.a[0] = NULL;
		ctx->blk = NULL;
	}

	smp->flags |= SMP_F_VOL_HDR;
	while (1) {
		/* Note: smp->ctx.a[0] == NULL every time we need to fetch a new header */
		if (!smp->ctx.a[0]) {
			if (!http_find_header(htx, hdr, ctx, 0))
				goto out;

			if (ctx->value.len < cook_l + 1)
				continue;

			smp->ctx.a[0] = ctx->value.ptr;
			smp->ctx.a[1] = smp->ctx.a[0] + ctx->value.len;
		}

		smp->data.type = SMP_T_STR;
		smp->flags |= SMP_F_CONST;
		smp->ctx.a[0] = http_extract_cookie_value(smp->ctx.a[0], smp->ctx.a[1],
							  cook, cook_l,
							  (smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_REQ,
							  &smp->data.u.str.area,
							  &smp->data.u.str.data);
		if (smp->ctx.a[0]) {
			found = 1;
			if (smp->opt & SMP_OPT_ITERATE) {
				/* iterate on cookie value */
				smp->flags |= SMP_F_NOT_LAST;
				return 1;
			}
			if (args->data.str.data == 0) {
				/* No cookie name, first occurrence returned */
				break;
			}
		}
		/* if we're looking for last occurrence, let's loop */
	}

	/* all cookie headers and values were scanned. If we're looking for the
	 * last occurrence, we may return it now.
	 */
  out:
	smp->flags &= ~SMP_F_NOT_LAST;
	return found;
}

/* Same than smp_fetch_cookie() but only relies on the sample direction to
 * choose the right channel. So instead of duplicating the code, we just change
 * the keyword and then fallback on smp_fetch_cookie().
 */
static int smp_fetch_chn_cookie(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	kw = ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_REQ ? "req.cook" : "res.cook");
	return smp_fetch_cookie(args, smp, kw, private);
}

/* Iterate over all cookies present in a request to count how many occurrences
 * match the name in args and args->data.str.len. If <multi> is non-null, then
 * multiple cookies may be parsed on the same line. The returned sample is of
 * type UINT. Accepts exactly 1 argument of type string.
 */
static int smp_fetch_cookie_cnt(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.cook_cnt / cook_cnt, res.cook_cnt / scook_cnt */
	struct channel *chn = ((kw[0] == 'c' || kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[0] == 's' || kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct http_hdr_ctx ctx;
	struct ist hdr;
	char *val_beg, *val_end;
	char *cook = NULL;
	size_t cook_l = 0;
	int cnt;

	if (args->type == ARGT_STR){
		cook = args->data.str.area;
		cook_l = args->data.str.data;
	}

	if (!htx)
		return 0;

	hdr = (!(check || (chn && chn->flags & CF_ISRESP)) ? ist("Cookie") : ist("Set-Cookie"));

	val_end = val_beg = NULL;
	ctx.blk = NULL;
	cnt = 0;
	while (1) {
		/* Note: val_beg == NULL every time we need to fetch a new header */
		if (!val_beg) {
			if (!http_find_header(htx, hdr, &ctx, 0))
				break;

			if (ctx.value.len < cook_l + 1)
				continue;

			val_beg = ctx.value.ptr;
			val_end = val_beg + ctx.value.len;
		}

		smp->data.type = SMP_T_STR;
		smp->flags |= SMP_F_CONST;
		while ((val_beg = http_extract_cookie_value(val_beg, val_end,
							    cook, cook_l,
							    (smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_REQ,
							    &smp->data.u.str.area,
							    &smp->data.u.str.data))) {
			cnt++;
		}
	}

	smp->data.type = SMP_T_SINT;
	smp->data.u.sint = cnt;
	smp->flags |= SMP_F_VOL_HDR;
	return 1;
}

/* Fetch an cookie's integer value. The integer value is returned. It
 * takes a mandatory argument of type string. It relies on smp_fetch_cookie().
 */
static int smp_fetch_cookie_val(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	int ret = smp_fetch_cookie(args, smp, kw, private);

	if (ret > 0) {
		smp->data.type = SMP_T_SINT;
		smp->data.u.sint = strl2ic(smp->data.u.str.area,
					   smp->data.u.str.data);
	}

	return ret;
}

/* Iterate over all cookies present in a message,
 * and return the list of cookie names separated by
 * the input argument character.
 * If no input argument is provided,
 * the default delimiter is ','.
 * The returned sample is of type CSTR.
 */
static int smp_fetch_cookie_names(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	/* possible keywords: req.cook_names, res.cook_names */
	struct channel *chn = ((kw[2] == 'q') ? SMP_REQ_CHN(smp) : SMP_RES_CHN(smp));
	struct check *check = ((kw[2] == 's') ? objt_check(smp->sess->origin) : NULL);
	struct htx *htx = smp_prefetch_htx(smp, chn, check, 1);
	struct http_hdr_ctx ctx;
	struct ist hdr;
	struct buffer *temp;
	char del = ',';
	char *ptr, *attr_beg, *attr_end;
	size_t len = 0;
	int is_req = !(check || (chn && chn->flags & CF_ISRESP));

	if (!htx)
		return 0;

	if (args->type == ARGT_STR)
		del = *args[0].data.str.area;

	hdr = (is_req ? ist("Cookie") : ist("Set-Cookie"));
	temp = get_trash_chunk();

	smp->flags |= SMP_F_VOL_HDR;
	attr_end = attr_beg = NULL;
	ctx.blk = NULL;
	/* Scan through all headers and extract all cookie names from
	 * 1. Cookie header(s) for request channel OR
	 * 2. Set-Cookie header(s) for response channel
	 */
	while (1) {
		/* Note: attr_beg == NULL every time we need to fetch a new header */
		if (!attr_beg) {
			/* For Set-Cookie, we need to fetch the entire header line (set flag to 1) */
			if (!http_find_header(htx, hdr, &ctx, !is_req))
				break;
			attr_beg = ctx.value.ptr;
			attr_end = attr_beg + ctx.value.len;
		}

		while (1) {
			attr_beg = http_extract_next_cookie_name(attr_beg, attr_end, is_req, &ptr, &len);
			if (!attr_beg)
				break;

			/* prepend delimiter if this is not the first cookie name found */
			if (temp->data)
				temp->area[temp->data++] = del;

			/* At this point ptr should point to the start of the cookie name and len would be the length of the cookie name */
			if (!chunk_memcat(temp, ptr, len))
				return 0;
		}
	}
	smp->data.type = SMP_T_STR;
	smp->data.u.str = *temp;
	return 1;
}

/************************************************************************/
/*           The code below is dedicated to sample fetches              */
/************************************************************************/

/* This scans a URL-encoded query string. It takes an optionally wrapping
 * string whose first contiguous chunk has its beginning in ctx->a[0] and end
 * in ctx->a[1], and the optional second part in (ctx->a[2]..ctx->a[3]). The
 * pointers are updated for next iteration before leaving.
 */
static int smp_fetch_param(char delim, const char *name, int name_len, const struct arg *args, struct sample *smp, const char *kw, void *private, char insensitive)
{
	const char *vstart, *vend;
	struct buffer *temp;
	const char **chunks = (const char **)smp->ctx.a;

	if (!http_find_next_url_param(chunks, name, name_len,
	                         &vstart, &vend, delim, insensitive))
		return 0;

	/* Create sample. If the value is contiguous, return the pointer as CONST,
	 * if the value is wrapped, copy-it in a buffer.
	 */
	smp->data.type = SMP_T_STR;
	if (chunks[2] &&
	    vstart >= chunks[0] && vstart <= chunks[1] &&
	    vend >= chunks[2] && vend <= chunks[3]) {
		/* Wrapped case. */
		size_t len1 = ( chunks[1] - vstart );
		size_t len2 = ( vend - chunks[2] );

		temp = get_trash_chunk_sz(len1 + len2);
		if (!temp)
			return 0;
		memcpy(temp->area, vstart, len1);
		memcpy(temp->area + len1, chunks[2], len2);
		smp->data.u.str.area = temp->area;
		smp->data.u.str.data = len1 + len2;
	} else {
		/* Contiguous case. */
		smp->data.u.str.area = (char *)vstart;
		smp->data.u.str.data = vend - vstart;
		smp->flags = SMP_F_VOL_1ST | SMP_F_CONST;
	}

	/* Update context, check wrapping. */
	chunks[0] = vend;
	if (chunks[2] && vend >= chunks[2] && vend <= chunks[3]) {
		chunks[1] = chunks[3];
		chunks[2] = NULL;
	}

	if (chunks[0] < chunks[1])
		smp->flags |= SMP_F_NOT_LAST;

	return 1;
}

/* This function iterates over each parameter of the query string. It uses
 * ctx->a[0] and ctx->a[1] to store the beginning and end of the current
 * parameter. Since it uses smp_fetch_param(), ctx->a[2..3] are both NULL.
 * An optional parameter name is passed in args[0], otherwise any parameter is
 * considered. It supports an optional delimiter argument for the beginning of
 * the string in args[1], which defaults to "?".
 */
static int smp_fetch_url_param(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	char delim = '?';
	const char *name;
	int name_len;
	char insensitive = 0;

	if ((args[0].type && args[0].type != ARGT_STR) ||
		(args[1].type && args[1].type != ARGT_STR) ||
	    (args[2].type && args[2].type != ARGT_STR))
		return 0;

	name = "";
	name_len = 0;
	if (args->type == ARGT_STR) {
		name     = args->data.str.area;
		name_len = args->data.str.data;
	}

	if (args[1].type && *args[1].data.str.area)
		delim = *args[1].data.str.area;
	if (args[2].type && *args[2].data.str.area == 'i')
		insensitive = 1;

	if (!smp->ctx.a[0]) { // first call, find the query string
		struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
		struct htx_sl *sl;

		if (!htx)
			return 0;

		sl = http_get_stline(htx);
		smp->ctx.a[0] = http_find_param_list(HTX_SL_REQ_UPTR(sl), HTX_SL_REQ_ULEN(sl), delim);
		if (!smp->ctx.a[0])
			return 0;

		smp->ctx.a[1] = HTX_SL_REQ_UPTR(sl) + HTX_SL_REQ_ULEN(sl);

		/* Assume that the context is filled with NULL pointer
		 * before the first call.
		 * smp->ctx.a[2] = NULL;
		 * smp->ctx.a[3] = NULL;
		 */
	}

	return smp_fetch_param(delim, name, name_len, args, smp, kw, private, insensitive);
}

/* This function iterates over each parameter of the body. This requires
 * that the body has been waited for using http-buffer-request. It uses
 * ctx->a[0] and ctx->a[1] to store the beginning and end of the first
 * contiguous part of the body, and optionally ctx->a[2..3] to reference the
 * optional second part if the body wraps at the end of the buffer. An optional
 * parameter name is passed in args[0], otherwise any parameter is considered.
 */
static int smp_fetch_body_param(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	const char *name;
	int name_len;
	char insensitive = 0;

	if ((args[0].type && args[0].type != ARGT_STR) ||
	    (args[1].type && args[1].type != ARGT_STR))
		return 0;

	name = "";
	name_len = 0;
	if (args[0].type == ARGT_STR) {
		name     = args[0].data.str.area;
		name_len = args[0].data.str.data;
	}

	if (args[1].type && *args[1].data.str.area == 'i')
		insensitive = 1;

	if (!smp->ctx.a[0]) { // first call, find the query string
		struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
		struct buffer *chk = NULL;
		struct ist body = IST_NULL;
		int32_t pos;

		if (!htx)
			return 0;

		if ((htx->flags & (HTX_FL_FRAGMENTED|HTX_FL_UNORDERED)) || htx_space_wraps(htx))
			htx_defrag(htx, NULL, 0);

		for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
			struct htx_blk   *blk  = htx_get_blk(htx, pos);
			enum htx_blk_type type = htx_get_blk_type(blk);

			if (type == HTX_BLK_TLR || type == HTX_BLK_EOT)
				break;
			if (type == HTX_BLK_DATA) {
				if (isttest(body)) {
					/* More than one DATA block we must use a trash */
					if (!chk) {
						chk = get_trash_chunk_sz(htx->data);
						chunk_istcat(chk, body);
					}
					chunk_istcat(chk, htx_get_blk_value(htx, blk));
					body = ist2(b_orig(chk), b_data(chk));
				}
				else
					body = htx_get_blk_value(htx, blk);
			}
		}

		smp->ctx.a[0] = istptr(body);
		smp->ctx.a[1] = istend(body);

		/* Assume that the context is filled with NULL pointer
		 * before the first call.
		 * smp->ctx.a[2] = NULL;
		 * smp->ctx.a[3] = NULL;
		 */
	}

	return smp_fetch_param('&', name, name_len, args, smp, kw, private, insensitive);
}

/* Return the signed integer value for the specified url parameter (see url_param
 * above).
 */
static int smp_fetch_url_param_val(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	int ret = smp_fetch_url_param(args, smp, kw, private);

	if (ret > 0) {
		smp->data.type = SMP_T_SINT;
		smp->data.u.sint = strl2ic(smp->data.u.str.area,
					   smp->data.u.str.data);
	}

	return ret;
}

/* This produces a 32-bit hash of the concatenation of the first occurrence of
 * the Host header followed by the path component if it begins with a slash ('/').
 * This means that '*' will not be added, resulting in exactly the first Host
 * entry. If no Host header is found, then the path is used. The resulting value
 * is hashed using the url hash followed by a full avalanche hash and provides a
 * 32-bit integer value. This fetch is useful for tracking per-URL activity on
 * high-traffic sites without having to store whole paths.
 * this differs from the base32 functions in that it includes the url parameters
 * as well as the path
 */
static int smp_fetch_url32(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn = SMP_REQ_CHN(smp);
	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
	struct http_hdr_ctx ctx;
	struct htx_sl *sl;
	struct ist path;
	unsigned int hash = 0;
	struct http_uri_parser parser;

	if (!htx)
		return 0;

	ctx.blk = NULL;
	if (http_find_header(htx, ist("Host"), &ctx, 1)) {
		/* OK we have the header value in ctx.value */
		while (ctx.value.len--)
			hash = *(ctx.value.ptr++) + (hash << 6) + (hash << 16) - hash;
	}

	/* now retrieve the path */
	sl = http_get_stline(htx);
	parser = http_uri_parser_init(htx_sl_req_uri(sl));
	path = http_parse_path(&parser);
	if (path.len && *(path.ptr) == '/') {
		while (path.len--)
			hash = *(path.ptr++) + (hash << 6) + (hash << 16) - hash;
	}

	hash = full_hash(hash);

	smp->data.type = SMP_T_SINT;
	smp->data.u.sint = hash;
	smp->flags = SMP_F_VOL_1ST;
	return 1;
}

/* This concatenates the source address with the 32-bit hash of the Host and
 * URL as returned by smp_fetch_base32(). The idea is to have per-source and
 * per-url counters. The result is a binary block from 8 to 20 bytes depending
 * on the source address length. The URL hash is stored before the address so
 * that in environments where IPv6 is insignificant, truncating the output to
 * 8 bytes would still work.
 */
static int smp_fetch_url32_src(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	const struct sockaddr_storage *src = (smp->strm ? sc_src(smp->strm->scf) : NULL);
	struct buffer *temp;

	if (!src)
		return 0;

	if (!smp_fetch_url32(args, smp, kw, private))
		return 0;

	temp = get_trash_chunk();
	*(unsigned int *) temp->area = htonl(smp->data.u.sint);
	temp->data += sizeof(unsigned int);

	switch (src->ss_family) {
	case AF_INET:
		memcpy(temp->area + temp->data,
		       &((struct sockaddr_in *)src)->sin_addr,
		       4);
		temp->data += 4;
		break;
	case AF_INET6:
		memcpy(temp->area + temp->data,
		       &((struct sockaddr_in6 *)src)->sin6_addr,
		       16);
		temp->data += 16;
		break;
	default:
		return 0;
	}

	smp->data.u.str = *temp;
	smp->data.type = SMP_T_BIN;
	return 1;
}

/************************************************************************/
/*                          Other utility functions                     */
/************************************************************************/

/* This function is used to validate the arguments passed to any "hdr" fetch
 * keyword. These keywords support an optional positive or negative occurrence
 * number. We must ensure that the number is greater than -MAX_HDR_HISTORY. It
 * is assumed that the types are already the correct ones. Returns 0 on error,
 * non-zero if OK. If <err> is not NULL, it will be filled with a pointer to an
 * error message in case of error, that the caller is responsible for freeing.
 * The initial location must either be freeable or NULL.
 * Note: this function's pointer is checked from Lua.
 */
int val_hdr(struct arg *arg, char **err_msg)
{
	if (arg && arg[1].type == ARGT_SINT && arg[1].data.sint < -MAX_HDR_HISTORY) {
		memprintf(err_msg, "header occurrence must be >= %d", -MAX_HDR_HISTORY);
		return 0;
	}
	return 1;
}

int val_query(struct arg *args, char **err_msg)
{
	int val = 0;

	if (args[0].type == ARGT_STOP)
		return 1;

	if (args[0].type != ARGT_STR) {
		memprintf(err_msg, "first argument must be a string");
		return 0;
	}

	if (args[0].data.str.data != 0) {
		if (chunk_strcmp(&args[0].data.str, "with_qm") != 0) {
			memprintf(err_msg, "supported options are: 'with_qm'");
			return 0;
		}
		val = 1;
	}

	chunk_destroy(&args[0].data.str);
	args[0].type = ARGT_SINT;
	args[0].data.sint = val;
	return 1;

}
/************************************************************************/
/*      All supported sample fetch keywords must be declared here.      */
/************************************************************************/

/* Note: must not be declared <const> as its list will be overwritten */
static struct sample_fetch_kw_list sample_fetch_keywords = {ILH, {
	{ "base",               smp_fetch_base,               0,                NULL,   SMP_T_STR,  SMP_USE_HRQHV },
	{ "base32",             smp_fetch_base32,             0,                NULL,   SMP_T_SINT, SMP_USE_HRQHV },
	{ "base32+src",         smp_fetch_base32_src,         0,                NULL,   SMP_T_BIN,  SMP_USE_HRQHV },
	{ "baseq",              smp_fetch_base,               0,                NULL,   SMP_T_STR,  SMP_USE_HRQHV },

	/* capture are allocated and are permanent in the stream */
	{ "capture.req.hdr",    smp_fetch_capture_req_hdr,    ARG1(1,SINT),     NULL,   SMP_T_STR,  SMP_USE_HRQHP },

	/* retrieve these captures from the HTTP logs */
	{ "capture.req.method", smp_fetch_capture_req_method, 0,                NULL,   SMP_T_STR,  SMP_USE_HRQHP },
	{ "capture.req.uri",    smp_fetch_capture_req_uri,    0,                NULL,   SMP_T_STR,  SMP_USE_HRQHP },
	{ "capture.req.ver",    smp_fetch_capture_req_ver,    0,                NULL,   SMP_T_STR,  SMP_USE_HRQHP },

	{ "capture.res.hdr",    smp_fetch_capture_res_hdr,    ARG1(1,SINT),     NULL,   SMP_T_STR,  SMP_USE_HRSHP },
	{ "capture.res.ver",    smp_fetch_capture_res_ver,    0,                NULL,   SMP_T_STR,  SMP_USE_HRQHP },

	/* cookie is valid in both directions (eg: for "stick ...") but cook*
	 * are only here to match the ACL's name, are request-only and are used
	 * for ACL compatibility only.
	 */
	{ "cook",               smp_fetch_cookie,             ARG1(0,STR),      NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "cookie",             smp_fetch_chn_cookie,         ARG1(0,STR),      NULL,    SMP_T_STR,  SMP_USE_HRQHV|SMP_USE_HRSHV },
	{ "cook_cnt",           smp_fetch_cookie_cnt,         ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRQHV },
	{ "cook_val",           smp_fetch_cookie_val,         ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRQHV },

	/* hdr is valid in both directions (eg: for "stick ...") but hdr_* are
	 * only here to match the ACL's name, are request-only and are used for
	 * ACL compatibility only.
	 */
	{ "hdr",                smp_fetch_chn_hdr,            ARG2(0,STR,SINT), val_hdr, SMP_T_STR,  SMP_USE_HRQHV|SMP_USE_HRSHV },
	{ "hdr_cnt",            smp_fetch_hdr_cnt,            ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRQHV },
	{ "hdr_ip",             smp_fetch_hdr_ip,             ARG2(0,STR,SINT), val_hdr, SMP_T_ADDR, SMP_USE_HRQHV },
	{ "hdr_val",            smp_fetch_hdr_val,            ARG2(0,STR,SINT), val_hdr, SMP_T_SINT, SMP_USE_HRQHV },

	{ "http_auth_type",     smp_fetch_http_auth_type,     0,                NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "http_auth_user",     smp_fetch_http_auth_user,     0,                NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "http_auth_pass",     smp_fetch_http_auth_pass,     0,                NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "http_auth_bearer",   smp_fetch_http_auth_bearer,   ARG1(0,STR),      NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "http_auth",          smp_fetch_http_auth,          ARG1(1,USR),      NULL,    SMP_T_BOOL, SMP_USE_HRQHV },
	{ "http_auth_group",    smp_fetch_http_auth_grp,      ARG1(1,USR),      NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "http_first_req",     smp_fetch_http_first_req,     0,                NULL,    SMP_T_BOOL, SMP_USE_HRQHP },
	{ "method",             smp_fetch_meth,               0,                NULL,    SMP_T_METH, SMP_USE_HRQHP },
	{ "path",               smp_fetch_path,               0,                NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "pathq",              smp_fetch_path,               0,                NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "query",              smp_fetch_query,              ARG1(0,STR), val_query,    SMP_T_STR,  SMP_USE_HRQHV },

	/* HTTP protocol on the request path */
	{ "req.proto_http",     smp_fetch_proto_http,         0,                NULL,    SMP_T_BOOL, SMP_USE_HRQHP },
	{ "req_proto_http",     smp_fetch_proto_http,         0,                NULL,    SMP_T_BOOL, SMP_USE_HRQHP },

	/* HTTP version on the request path */
	{ "req.ver",            smp_fetch_rqver,              0,                NULL,    SMP_T_STR,  SMP_USE_HRQHP },
	{ "req_ver",            smp_fetch_rqver,              0,                NULL,    SMP_T_STR,  SMP_USE_HRQHP },

	{ "req.body",           smp_fetch_body,               0,                NULL,    SMP_T_BIN,  SMP_USE_HRQHV },
	{ "req.body_len",       smp_fetch_body_len,           0,                NULL,    SMP_T_SINT, SMP_USE_HRQHV },
	{ "req.body_size",      smp_fetch_body_size,          0,                NULL,    SMP_T_SINT, SMP_USE_HRQHV },
	{ "req.body_param",     smp_fetch_body_param,         ARG2(0,STR,STR),  NULL,    SMP_T_BIN,  SMP_USE_HRQHV },

	{ "req.hdrs",           smp_fetch_hdrs,               0,                NULL,    SMP_T_BIN,  SMP_USE_HRQHV },
	{ "req.hdrs_bin",       smp_fetch_hdrs_bin,           0,                NULL,    SMP_T_BIN,  SMP_USE_HRQHV },

	/* HTTP version on the response path */
	{ "res.ver",            smp_fetch_stver,              0,                NULL,    SMP_T_STR,  SMP_USE_HRSHP },
	{ "resp_ver",           smp_fetch_stver,              0,                NULL,    SMP_T_STR,  SMP_USE_HRSHP },

	{ "res.body",           smp_fetch_body,               0,                NULL,    SMP_T_BIN,  SMP_USE_HRSHV },
	{ "res.body_len",       smp_fetch_body_len,           0,                NULL,    SMP_T_SINT, SMP_USE_HRSHV },
	{ "res.body_size",      smp_fetch_body_size,          0,                NULL,    SMP_T_SINT, SMP_USE_HRSHV },

	{ "res.hdrs",           smp_fetch_hdrs,               0,                NULL,    SMP_T_BIN,  SMP_USE_HRSHV },
	{ "res.hdrs_bin",       smp_fetch_hdrs_bin,           0,                NULL,    SMP_T_BIN,  SMP_USE_HRSHV },

	/* explicit req.{cook,hdr} are used to force the fetch direction to be request-only */
	{ "req.cook",           smp_fetch_cookie,             ARG1(0,STR),      NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "req.cook_cnt",       smp_fetch_cookie_cnt,         ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRQHV },
	{ "req.cook_val",       smp_fetch_cookie_val,         ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRQHV },
	{ "req.cook_names",     smp_fetch_cookie_names,       ARG1(0,STR),      NULL,    SMP_T_STR,  SMP_USE_HRQHV },

	{ "req.fhdr",           smp_fetch_fhdr,               ARG2(0,STR,SINT), val_hdr, SMP_T_STR,  SMP_USE_HRQHV },
	{ "req.fhdr_cnt",       smp_fetch_fhdr_cnt,           ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRQHV },
	{ "req.hdr",            smp_fetch_hdr,                ARG2(0,STR,SINT), val_hdr, SMP_T_STR,  SMP_USE_HRQHV },
	{ "req.hdr_cnt",        smp_fetch_hdr_cnt,            ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRQHV },
	{ "req.hdr_ip",         smp_fetch_hdr_ip,             ARG2(0,STR,SINT), val_hdr, SMP_T_ADDR, SMP_USE_HRQHV },
	{ "req.hdr_names",      smp_fetch_hdr_names,          ARG1(0,STR),      NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "req.hdr_val",        smp_fetch_hdr_val,            ARG2(0,STR,SINT), val_hdr, SMP_T_SINT, SMP_USE_HRQHV },

	/* explicit req.{cook,hdr} are used to force the fetch direction to be response-only */
	{ "res.cook",           smp_fetch_cookie,             ARG1(0,STR),      NULL,    SMP_T_STR,  SMP_USE_HRSHV },
	{ "res.cook_cnt",       smp_fetch_cookie_cnt,         ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRSHV },
	{ "res.cook_val",       smp_fetch_cookie_val,         ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRSHV },
	{ "res.cook_names",     smp_fetch_cookie_names,       ARG1(0,STR),      NULL,    SMP_T_STR,  SMP_USE_HRSHV },

	{ "res.fhdr",           smp_fetch_fhdr,               ARG2(0,STR,SINT), val_hdr, SMP_T_STR,  SMP_USE_HRSHV },
	{ "res.fhdr_cnt",       smp_fetch_fhdr_cnt,           ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRSHV },
	{ "res.hdr",            smp_fetch_hdr,                ARG2(0,STR,SINT), val_hdr, SMP_T_STR,  SMP_USE_HRSHV },
	{ "res.hdr_cnt",        smp_fetch_hdr_cnt,            ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRSHV },
	{ "res.hdr_ip",         smp_fetch_hdr_ip,             ARG2(0,STR,SINT), val_hdr, SMP_T_ADDR, SMP_USE_HRSHV },
	{ "res.hdr_names",      smp_fetch_hdr_names,          ARG1(0,STR),      NULL,    SMP_T_STR,  SMP_USE_HRSHV },
	{ "res.hdr_val",        smp_fetch_hdr_val,            ARG2(0,STR,SINT), val_hdr, SMP_T_SINT, SMP_USE_HRSHV },

	{ "server_status",      smp_fetch_srv_status,         0,                NULL,    SMP_T_SINT, SMP_USE_HRSHP },

	/* scook is valid only on the response and is used for ACL compatibility */
	{ "scook",              smp_fetch_cookie,             ARG1(0,STR),      NULL,    SMP_T_STR,  SMP_USE_HRSHV },
	{ "scook_cnt",          smp_fetch_cookie_cnt,         ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRSHV },
	{ "scook_val",          smp_fetch_cookie_val,         ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRSHV },

	/* shdr is valid only on the response and is used for ACL compatibility */
	{ "shdr",               smp_fetch_hdr,                ARG2(0,STR,SINT), val_hdr, SMP_T_STR,  SMP_USE_HRSHV },
	{ "shdr_cnt",           smp_fetch_hdr_cnt,            ARG1(0,STR),      NULL,    SMP_T_SINT, SMP_USE_HRSHV },
	{ "shdr_ip",            smp_fetch_hdr_ip,             ARG2(0,STR,SINT), val_hdr, SMP_T_ADDR, SMP_USE_HRSHV },
	{ "shdr_val",           smp_fetch_hdr_val,            ARG2(0,STR,SINT), val_hdr, SMP_T_SINT, SMP_USE_HRSHV },

	{ "status",             smp_fetch_stcode,             0,                NULL,    SMP_T_SINT, SMP_USE_HRSHP },
	{ "txn.status",         smp_fetch_srv_status,         0,                NULL,    SMP_T_SINT, SMP_USE_HRSHP },
	{ "unique-id",          smp_fetch_uniqueid,           0,                NULL,    SMP_T_STR,  SMP_SRC_L4SRV },
	{ "url",                smp_fetch_url,                0,                NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "url32",              smp_fetch_url32,              0,                NULL,    SMP_T_SINT, SMP_USE_HRQHV },
	{ "url32+src",          smp_fetch_url32_src,          0,                NULL,    SMP_T_BIN,  SMP_USE_HRQHV },
	{ "url_ip",             smp_fetch_url_ip,             0,                NULL,    SMP_T_IPV4, SMP_USE_HRQHV },
	{ "url_port",           smp_fetch_url_port,           0,                NULL,    SMP_T_SINT, SMP_USE_HRQHV },
	{ "url_param",          smp_fetch_url_param,          ARG3(0,STR,STR,STR),  NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "urlp"     ,          smp_fetch_url_param,          ARG3(0,STR,STR,STR),  NULL,    SMP_T_STR,  SMP_USE_HRQHV },
	{ "urlp_val",           smp_fetch_url_param_val,      ARG3(0,STR,STR,STR),  NULL,    SMP_T_SINT, SMP_USE_HRQHV },

	{ /* END */ },
}};

INITCALL1(STG_REGISTER, sample_register_fetches, &sample_fetch_keywords);

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