Adding upstream version 2.6.12.upstream/2.6.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2248 insertions, 0 deletions

diff --git a/src/http_fetch.c b/src/http_fetch.c
new file mode 100644
index 0000000..1028599
--- /dev/null
+++ b/src/http_fetch.c
@@ -0,0 +1,2248 @@
+/*
+ * 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/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/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 */
+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)
+
+/* 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;
+	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, global.tune.bufsize - 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_create_txn(s))
+		return NULL;
+	txn = s->txn;
+	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) {
+		if (!(chn->flags & CF_ISRESP)) {
+			txn->meth = sl->info.req.meth;
+			if (txn->meth == HTTP_METH_GET || txn->meth == HTTP_METH_HEAD)
+				s->flags |= SF_REDIRECTABLE;
+		}
+		else if (txn->status == -1)
+			txn->status = sl->info.res.status;
+		if (sl->flags & HTX_SL_F_VER_11)
+			msg->flags |= HTTP_MSGF_VER_11;
+	}
+
+	/* everything's OK */
+  end:
+	return htx;
+}
+
+/* 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 : 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 channel *chn = SMP_REQ_CHN(smp);
+	struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 1);
+	struct htx_sl *sl;
+	char *ptr;
+	int len;
+
+	if (!htx)
+		return 0;
+
+	sl = http_get_stline(htx);
+	len = HTX_SL_REQ_VLEN(sl);
+	ptr = HTX_SL_REQ_VPTR(sl);
+
+	while ((len-- > 0) && (*ptr++ != '/'));
+	if (len <= 0)
+		return 0;
+
+	smp->data.type = SMP_T_STR;
+	smp->data.u.str.area = ptr;
+	smp->data.u.str.data = len;
+
+	smp->flags = SMP_F_VOL_1ST | SMP_F_CONST;
+	return 1;
+}
+
+static int smp_fetch_stver(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_VLEN(sl);
+	ptr = HTX_SL_RES_VPTR(sl);
+
+	while ((len-- > 0) && (*ptr++ != '/'));
+	if (len <= 0)
+		return 0;
+
+	smp->data.type = SMP_T_STR;
+	smp->data.u.str.area = ptr;
+	smp->data.u.str.data = len;
+
+	smp->flags = SMP_F_VOL_1ST | SMP_F_CONST;
+	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;
+}
+
+static int smp_fetch_uniqueid(const struct arg *args, struct sample *smp, const char *kw, void *private)
+{
+	struct ist unique_id;
+
+	if (LIST_ISEMPTY(&smp->sess->fe->format_unique_id))
+		return 0;
+
+	if (!smp->strm)
+		return 0;
+
+	unique_id = stream_generate_unique_id(smp->strm, &smp->sess->fe->format_unique_id);
+	if (!isttest(unique_id))
+		return 0;
+
+	smp->data.u.str.area = smp->strm->unique_id.ptr;
+	smp->data.u.str.data = smp->strm->unique_id.len;
+	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 separes 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 *temp;
+	int32_t pos;
+	int finished = 0;
+
+	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_TLR || type == HTX_BLK_EOT) {
+			finished = 1;
+			break;
+		}
+		if (type == HTX_BLK_DATA) {
+			if (!h1_format_htx_data(htx_get_blk_value(htx, blk), temp, 0))
+				return 0;
+		}
+	}
+
+	smp->data.type = SMP_T_BIN;
+	smp->data.u.str = *temp;
+	smp->flags = SMP_F_VOL_TEST;
+
+	if (!finished && (check || (chn && !channel_full(chn, global.tune.maxrewrite) &&
+				    !(chn->flags & (CF_EOI|CF_SHUTR|CF_READ_ERROR)))))
+		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 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);
+	}
+	if (htx->extra != ULLONG_MAX)
+		len += htx->extra;
+
+	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 (inet_pton(AF_INET6, temp->area, &smp->data.u.ipv6)) {
+				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++ != '?');
+
+	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->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;
+	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;
+	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;
+	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;
+		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->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->auth.user,
+				      smp->strm->txn->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->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->auth.user,
+	                smp->strm->txn->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->auth.user;
+	smp->data.u.str.data = strlen(smp->strm->txn->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;
+	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;
+	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 http_txn *txn;
+
+	if (!smp->strm)
+		return 0;
+
+	txn = smp->strm->txn;
+	if (!txn || txn->req.msg_state < HTTP_MSG_BODY)
+		return 0;
+
+	if (txn->req.flags & HTTP_MSGF_VER_11)
+		smp->data.u.str.area = "HTTP/1.1";
+	else
+		smp->data.u.str.area = "HTTP/1.0";
+
+	smp->data.u.str.data = 8;
+	smp->data.type  = SMP_T_STR;
+	smp->flags = SMP_F_CONST;
+	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 http_txn *txn;
+
+	if (!smp->strm)
+		return 0;
+
+	txn = smp->strm->txn;
+	if (!txn || txn->rsp.msg_state < HTTP_MSG_BODY)
+		return 0;
+
+	if (txn->rsp.flags & HTTP_MSGF_VER_11)
+		smp->data.u.str.area = "HTTP/1.1";
+	else
+		smp->data.u.str.area = "HTTP/1.0";
+
+	smp->data.u.str.data = 8;
+	smp->data.type  = SMP_T_STR;
+	smp->flags = SMP_F_CONST;
+	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;
+}
+
+/************************************************************************/
+/*           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)
+{
+	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))
+		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. */
+		temp = get_trash_chunk();
+		memcpy(temp->area, vstart, chunks[1] - vstart);
+		memcpy(temp->area + ( chunks[1] - vstart ), chunks[2],
+		       vend - chunks[2]);
+		smp->data.u.str.area = temp->area;
+		smp->data.u.str.data = ( chunks[1] - vstart ) + ( vend - chunks[2] );
+	} 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;
+
+	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->type == ARGT_STR) {
+		name     = args->data.str.area;
+		name_len = args->data.str.data;
+	}
+
+	if (args[1].type)
+		delim = *args[1].data.str.area;
+
+	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);
+}
+
+/* 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;
+
+	if (args[0].type && args[0].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 (!smp->ctx.a[0]) { // first call, find the query string
+		struct htx *htx = smp_prefetch_htx(smp, chn, NULL, 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_TLR || type == HTX_BLK_EOT)
+				break;
+			if (type == HTX_BLK_DATA) {
+				if (!h1_format_htx_data(htx_get_blk_value(htx, blk), temp, 0))
+					return 0;
+			}
+		}
+
+		smp->ctx.a[0] = temp->area;
+		smp->ctx.a[1] = temp->area + temp->data;
+
+		/* 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);
+}
+
+/* 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;
+}
+
+/************************************************************************/
+/*      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_IPV4, 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,              0,                NULL,    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_HRQHV },
+	{ "req_ver",            smp_fetch_rqver,              0,                NULL,    SMP_T_STR,  SMP_USE_HRQHV },
+
+	{ "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,         ARG1(0,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_HRSHV },
+	{ "resp_ver",           smp_fetch_stver,              0,                NULL,    SMP_T_STR,  SMP_USE_HRSHV },
+
+	{ "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.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_IPV4, 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.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_IPV4, 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 },
+
+	/* 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_IPV4, 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 },
+	{ "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,          ARG2(0,STR,STR),  NULL,    SMP_T_STR,  SMP_USE_HRQHV },
+	{ "urlp"     ,          smp_fetch_url_param,          ARG2(0,STR,STR),  NULL,    SMP_T_STR,  SMP_USE_HRQHV },
+	{ "urlp_val",           smp_fetch_url_param_val,      ARG2(0,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:
+ */