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Willy Tarreaubaaee002006-06-26 02:48:02 +02001/*
2 * Backend variables and functions.
3 *
Willy Tarreau1a7eca12013-01-07 22:38:03 +01004 * Copyright 2000-2013 Willy Tarreau <w@1wt.eu>
Willy Tarreaubaaee002006-06-26 02:48:02 +02005 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#include <errno.h>
14#include <fcntl.h>
15#include <stdio.h>
16#include <stdlib.h>
17#include <syslog.h>
Willy Tarreauf19cf372006-11-14 15:40:51 +010018#include <string.h>
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +020019#include <ctype.h>
Dmitry Sivachenkocaf58982009-08-24 15:11:06 +040020#include <sys/types.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020021
Willy Tarreauc7e42382012-08-24 19:22:53 +020022#include <common/buffer.h>
Willy Tarreau2dd0d472006-06-29 17:53:05 +020023#include <common/compat.h>
Willy Tarreaue3ba5f02006-06-29 18:54:54 +020024#include <common/config.h>
Willy Tarreau7c669d72008-06-20 15:04:11 +020025#include <common/debug.h>
Bhaskar98634f02013-10-29 23:30:51 -040026#include <common/hash.h>
Willy Tarreau0c303ee2008-07-07 00:09:58 +020027#include <common/ticks.h>
Willy Tarreau2dd0d472006-06-29 17:53:05 +020028#include <common/time.h>
KOVACS Krisztianb3e54fe2014-11-17 15:11:45 +010029#include <common/namespace.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020030
Willy Tarreaubaaee002006-06-26 02:48:02 +020031#include <types/global.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020032
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +010033#include <proto/acl.h>
Willy Tarreau34db1082012-04-19 17:16:54 +020034#include <proto/arg.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020035#include <proto/backend.h>
Willy Tarreauc7e42382012-08-24 19:22:53 +020036#include <proto/channel.h>
Willy Tarreau03fa5df2010-05-24 21:02:37 +020037#include <proto/frontend.h>
Willy Tarreau6b2e11b2009-10-01 07:52:15 +020038#include <proto/lb_chash.h>
Willy Tarreauf09c6602012-02-13 17:12:08 +010039#include <proto/lb_fas.h>
Willy Tarreauf89c1872009-10-01 11:19:37 +020040#include <proto/lb_fwlc.h>
41#include <proto/lb_fwrr.h>
42#include <proto/lb_map.h>
Willy Tarreau4aac7db2014-05-16 11:48:10 +020043#include <proto/log.h>
Willy Tarreau53a47662017-08-28 10:53:00 +020044#include <proto/mux_pt.h>
Willy Tarreau3fdb3662012-11-12 00:42:33 +010045#include <proto/obj_type.h>
Willy Tarreaud4c33c82013-01-07 21:59:07 +010046#include <proto/payload.h>
Willy Tarreaud1d54542012-09-12 22:58:11 +020047#include <proto/protocol.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020048#include <proto/proto_http.h>
Willy Tarreaua8f55d52010-05-31 17:44:19 +020049#include <proto/proto_tcp.h>
Willy Tarreau4aac7db2014-05-16 11:48:10 +020050#include <proto/proxy.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020051#include <proto/queue.h>
Willy Tarreaud4c33c82013-01-07 21:59:07 +010052#include <proto/sample.h>
Willy Tarreau7f062c42009-03-05 18:43:00 +010053#include <proto/server.h>
Willy Tarreau87b09662015-04-03 00:22:06 +020054#include <proto/stream.h>
Willy Tarreau9e000c62011-03-10 14:03:36 +010055#include <proto/stream_interface.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020056#include <proto/task.h>
57
Willy Tarreau732eac42015-07-09 11:40:25 +020058#ifdef USE_OPENSSL
59#include <proto/ssl_sock.h>
60#endif /* USE_OPENSSL */
61
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -050062int be_lastsession(const struct proxy *be)
63{
64 if (be->be_counters.last_sess)
65 return now.tv_sec - be->be_counters.last_sess;
66
67 return -1;
68}
69
Bhaskar98634f02013-10-29 23:30:51 -040070/* helper function to invoke the correct hash method */
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070071static unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len)
Bhaskar98634f02013-10-29 23:30:51 -040072{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070073 unsigned int hash;
Bhaskar98634f02013-10-29 23:30:51 -040074
75 switch (px->lbprm.algo & BE_LB_HASH_FUNC) {
76 case BE_LB_HFCN_DJB2:
77 hash = hash_djb2(key, len);
78 break;
Willy Tarreaua0f42712013-11-14 14:30:35 +010079 case BE_LB_HFCN_WT6:
80 hash = hash_wt6(key, len);
81 break;
Willy Tarreau324f07f2015-01-20 19:44:50 +010082 case BE_LB_HFCN_CRC32:
83 hash = hash_crc32(key, len);
84 break;
Bhaskar98634f02013-10-29 23:30:51 -040085 case BE_LB_HFCN_SDBM:
86 /* this is the default hash function */
87 default:
88 hash = hash_sdbm(key, len);
89 break;
90 }
91
92 return hash;
93}
94
Willy Tarreaubaaee002006-06-26 02:48:02 +020095/*
96 * This function recounts the number of usable active and backup servers for
97 * proxy <p>. These numbers are returned into the p->srv_act and p->srv_bck.
Willy Tarreaub625a082007-11-26 01:15:43 +010098 * This function also recomputes the total active and backup weights. However,
Willy Tarreauf4cca452008-03-08 21:42:54 +010099 * it does not update tot_weight nor tot_used. Use update_backend_weight() for
Willy Tarreaub625a082007-11-26 01:15:43 +0100100 * this.
Emeric Brun52a91d32017-08-31 14:41:55 +0200101 * This functions is designed to be called before server's weight and state
102 * commit so it uses 'next' weight and states values.
Christopher Faulet5b517552017-06-09 14:17:53 +0200103 *
104 * threads: this is the caller responsibility to lock data. For now, this
105 * function is called from lb modules, so it should be ok. But if you need to
106 * call it from another place, be careful (and update this comment).
Willy Tarreaubaaee002006-06-26 02:48:02 +0200107 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200108void recount_servers(struct proxy *px)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200109{
110 struct server *srv;
111
Willy Tarreau20697042007-11-15 23:26:18 +0100112 px->srv_act = px->srv_bck = 0;
113 px->lbprm.tot_wact = px->lbprm.tot_wbck = 0;
Willy Tarreaub625a082007-11-26 01:15:43 +0100114 px->lbprm.fbck = NULL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200115 for (srv = px->srv; srv != NULL; srv = srv->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +0200116 if (!srv_willbe_usable(srv))
Willy Tarreaub625a082007-11-26 01:15:43 +0100117 continue;
118
Willy Tarreauc93cd162014-05-13 15:54:22 +0200119 if (srv->flags & SRV_F_BACKUP) {
Willy Tarreaub625a082007-11-26 01:15:43 +0100120 if (!px->srv_bck &&
Willy Tarreauf4cca452008-03-08 21:42:54 +0100121 !(px->options & PR_O_USE_ALL_BK))
Willy Tarreaub625a082007-11-26 01:15:43 +0100122 px->lbprm.fbck = srv;
123 px->srv_bck++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400124 srv->cumulative_weight = px->lbprm.tot_wbck;
Emeric Brun52a91d32017-08-31 14:41:55 +0200125 px->lbprm.tot_wbck += srv->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100126 } else {
127 px->srv_act++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400128 srv->cumulative_weight = px->lbprm.tot_wact;
Emeric Brun52a91d32017-08-31 14:41:55 +0200129 px->lbprm.tot_wact += srv->next_eweight;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200130 }
131 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100132}
Willy Tarreau20697042007-11-15 23:26:18 +0100133
Willy Tarreaub625a082007-11-26 01:15:43 +0100134/* This function simply updates the backend's tot_weight and tot_used values
135 * after servers weights have been updated. It is designed to be used after
136 * recount_servers() or equivalent.
Christopher Faulet5b517552017-06-09 14:17:53 +0200137 *
138 * threads: this is the caller responsibility to lock data. For now, this
139 * function is called from lb modules, so it should be ok. But if you need to
140 * call it from another place, be careful (and update this comment).
Willy Tarreaub625a082007-11-26 01:15:43 +0100141 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200142void update_backend_weight(struct proxy *px)
Willy Tarreaub625a082007-11-26 01:15:43 +0100143{
Willy Tarreau20697042007-11-15 23:26:18 +0100144 if (px->srv_act) {
145 px->lbprm.tot_weight = px->lbprm.tot_wact;
146 px->lbprm.tot_used = px->srv_act;
147 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100148 else if (px->lbprm.fbck) {
149 /* use only the first backup server */
Emeric Brun52a91d32017-08-31 14:41:55 +0200150 px->lbprm.tot_weight = px->lbprm.fbck->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100151 px->lbprm.tot_used = 1;
Willy Tarreau20697042007-11-15 23:26:18 +0100152 }
153 else {
Willy Tarreaub625a082007-11-26 01:15:43 +0100154 px->lbprm.tot_weight = px->lbprm.tot_wbck;
155 px->lbprm.tot_used = px->srv_bck;
Willy Tarreau20697042007-11-15 23:26:18 +0100156 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100157}
158
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200159/*
160 * This function tries to find a running server for the proxy <px> following
161 * the source hash method. Depending on the number of active/backup servers,
162 * it will either look for active servers, or for backup servers.
163 * If any server is found, it will be returned. If no valid server is found,
164 * NULL is returned.
165 */
Christopher Fauletf0614e82017-06-09 14:20:29 +0200166static struct server *get_server_sh(struct proxy *px, const char *addr, int len)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200167{
168 unsigned int h, l;
169
170 if (px->lbprm.tot_weight == 0)
171 return NULL;
172
173 l = h = 0;
174
175 /* note: we won't hash if there's only one server left */
176 if (px->lbprm.tot_used == 1)
177 goto hash_done;
178
179 while ((l + sizeof (int)) <= len) {
180 h ^= ntohl(*(unsigned int *)(&addr[l]));
181 l += sizeof (int);
182 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500183 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100184 h = full_hash(h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200185 hash_done:
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200186 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
187 return chash_get_server_hash(px, h);
188 else
189 return map_get_server_hash(px, h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200190}
191
192/*
193 * This function tries to find a running server for the proxy <px> following
194 * the URI hash method. In order to optimize cache hits, the hash computation
195 * ends at the question mark. Depending on the number of active/backup servers,
196 * it will either look for active servers, or for backup servers.
197 * If any server is found, it will be returned. If no valid server is found,
198 * NULL is returned.
199 *
200 * This code was contributed by Guillaume Dallaire, who also selected this hash
201 * algorithm out of a tens because it gave him the best results.
202 *
203 */
Christopher Fauletf0614e82017-06-09 14:20:29 +0200204static struct server *get_server_uh(struct proxy *px, char *uri, int uri_len)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200205{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700206 unsigned int hash = 0;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200207 int c;
208 int slashes = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400209 const char *start, *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200210
211 if (px->lbprm.tot_weight == 0)
212 return NULL;
213
214 /* note: we won't hash if there's only one server left */
215 if (px->lbprm.tot_used == 1)
216 goto hash_done;
217
218 if (px->uri_len_limit)
219 uri_len = MIN(uri_len, px->uri_len_limit);
220
Bhaskar98634f02013-10-29 23:30:51 -0400221 start = end = uri;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200222 while (uri_len--) {
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200223 c = *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200224 if (c == '/') {
225 slashes++;
226 if (slashes == px->uri_dirs_depth1) /* depth+1 */
227 break;
228 }
Oskar Stolc8dc41842012-05-19 10:19:54 +0100229 else if (c == '?' && !px->uri_whole)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200230 break;
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200231 end++;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200232 }
Bhaskar98634f02013-10-29 23:30:51 -0400233
234 hash = gen_hash(px, start, (end - start));
235
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500236 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100237 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200238 hash_done:
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200239 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
240 return chash_get_server_hash(px, hash);
241 else
242 return map_get_server_hash(px, hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200243}
244
Christopher Faulet5b517552017-06-09 14:17:53 +0200245/*
Willy Tarreau01732802007-11-01 22:48:15 +0100246 * This function tries to find a running server for the proxy <px> following
247 * the URL parameter hash method. It looks for a specific parameter in the
248 * URL and hashes it to compute the server ID. This is useful to optimize
249 * performance by avoiding bounces between servers in contexts where sessions
250 * are shared but cookies are not usable. If the parameter is not found, NULL
251 * is returned. If any server is found, it will be returned. If no valid server
252 * is found, NULL is returned.
Willy Tarreau01732802007-11-01 22:48:15 +0100253 */
Christopher Faulet8fe48912017-06-09 14:23:09 +0200254static struct server *get_server_ph(struct proxy *px, const char *uri, int uri_len)
Willy Tarreau01732802007-11-01 22:48:15 +0100255{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700256 unsigned int hash = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400257 const char *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200258 const char *p;
259 const char *params;
Willy Tarreau01732802007-11-01 22:48:15 +0100260 int plen;
261
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200262 /* when tot_weight is 0 then so is srv_count */
Willy Tarreau20697042007-11-15 23:26:18 +0100263 if (px->lbprm.tot_weight == 0)
Willy Tarreau01732802007-11-01 22:48:15 +0100264 return NULL;
265
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200266 if ((p = memchr(uri, '?', uri_len)) == NULL)
267 return NULL;
268
Willy Tarreau01732802007-11-01 22:48:15 +0100269 p++;
270
271 uri_len -= (p - uri);
272 plen = px->url_param_len;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200273 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100274
275 while (uri_len > plen) {
276 /* Look for the parameter name followed by an equal symbol */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200277 if (params[plen] == '=') {
278 if (memcmp(params, px->url_param_name, plen) == 0) {
279 /* OK, we have the parameter here at <params>, and
Willy Tarreau01732802007-11-01 22:48:15 +0100280 * the value after the equal sign, at <p>
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200281 * skip the equal symbol
Willy Tarreau01732802007-11-01 22:48:15 +0100282 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200283 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400284 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200285 uri_len -= plen + 1;
286
Bhaskar98634f02013-10-29 23:30:51 -0400287 while (uri_len && *end != '&') {
Willy Tarreau01732802007-11-01 22:48:15 +0100288 uri_len--;
Bhaskar98634f02013-10-29 23:30:51 -0400289 end++;
Willy Tarreau01732802007-11-01 22:48:15 +0100290 }
Bhaskar98634f02013-10-29 23:30:51 -0400291 hash = gen_hash(px, start, (end - start));
292
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500293 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100294 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400295
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200296 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
297 return chash_get_server_hash(px, hash);
298 else
299 return map_get_server_hash(px, hash);
Willy Tarreau01732802007-11-01 22:48:15 +0100300 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200301 }
302 /* skip to next parameter */
303 p = memchr(params, '&', uri_len);
304 if (!p)
305 return NULL;
306 p++;
307 uri_len -= (p - params);
308 params = p;
309 }
310 return NULL;
311}
312
313/*
314 * this does the same as the previous server_ph, but check the body contents
315 */
Christopher Faulet8fe48912017-06-09 14:23:09 +0200316static struct server *get_server_ph_post(struct stream *s)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200317{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700318 unsigned int hash = 0;
Willy Tarreaueee5b512015-04-03 23:46:31 +0200319 struct http_txn *txn = s->txn;
Willy Tarreau22ec1ea2014-11-27 20:45:39 +0100320 struct channel *req = &s->req;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200321 struct http_msg *msg = &txn->req;
322 struct proxy *px = s->be;
323 unsigned int plen = px->url_param_len;
Willy Tarreau2d8e4852014-04-17 20:08:17 +0200324 unsigned long len = http_body_bytes(msg);
Willy Tarreau0d090502014-04-17 20:31:44 +0200325 const char *params = b_ptr(req->buf, -http_data_rewind(msg));
Willy Tarreau157dd632009-12-06 19:18:09 +0100326 const char *p = params;
Bhaskar98634f02013-10-29 23:30:51 -0400327 const char *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200328
Willy Tarreau157dd632009-12-06 19:18:09 +0100329 if (len == 0)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200330 return NULL;
331
Willy Tarreauf69d4ff2015-05-02 00:05:47 +0200332 if (len > req->buf->data + req->buf->size - p)
333 len = req->buf->data + req->buf->size - p;
334
Willy Tarreau157dd632009-12-06 19:18:09 +0100335 if (px->lbprm.tot_weight == 0)
336 return NULL;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200337
338 while (len > plen) {
339 /* Look for the parameter name followed by an equal symbol */
340 if (params[plen] == '=') {
341 if (memcmp(params, px->url_param_name, plen) == 0) {
342 /* OK, we have the parameter here at <params>, and
343 * the value after the equal sign, at <p>
344 * skip the equal symbol
345 */
346 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400347 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200348 len -= plen + 1;
349
Bhaskar98634f02013-10-29 23:30:51 -0400350 while (len && *end != '&') {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200351 if (unlikely(!HTTP_IS_TOKEN(*p))) {
Willy Tarreau157dd632009-12-06 19:18:09 +0100352 /* if in a POST, body must be URI encoded or it's not a URI.
Bhaskar98634f02013-10-29 23:30:51 -0400353 * Do not interpret any possible binary data as a parameter.
Willy Tarreau157dd632009-12-06 19:18:09 +0100354 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200355 if (likely(HTTP_IS_LWS(*p))) /* eol, uncertain uri len */
356 break;
357 return NULL; /* oh, no; this is not uri-encoded.
358 * This body does not contain parameters.
359 */
360 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200361 len--;
Bhaskar98634f02013-10-29 23:30:51 -0400362 end++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200363 /* should we break if vlen exceeds limit? */
364 }
Bhaskar98634f02013-10-29 23:30:51 -0400365 hash = gen_hash(px, start, (end - start));
366
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500367 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100368 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400369
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200370 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
371 return chash_get_server_hash(px, hash);
372 else
373 return map_get_server_hash(px, hash);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200374 }
375 }
Willy Tarreau01732802007-11-01 22:48:15 +0100376 /* skip to next parameter */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200377 p = memchr(params, '&', len);
Willy Tarreau01732802007-11-01 22:48:15 +0100378 if (!p)
379 return NULL;
380 p++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200381 len -= (p - params);
382 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100383 }
384 return NULL;
385}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200386
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200387
Willy Tarreaubaaee002006-06-26 02:48:02 +0200388/*
Benoitaffb4812009-03-25 13:02:10 +0100389 * This function tries to find a running server for the proxy <px> following
390 * the Header parameter hash method. It looks for a specific parameter in the
391 * URL and hashes it to compute the server ID. This is useful to optimize
392 * performance by avoiding bounces between servers in contexts where sessions
393 * are shared but cookies are not usable. If the parameter is not found, NULL
394 * is returned. If any server is found, it will be returned. If no valid server
395 * is found, NULL is returned.
396 */
Christopher Faulet8fe48912017-06-09 14:23:09 +0200397static struct server *get_server_hh(struct stream *s)
Benoitaffb4812009-03-25 13:02:10 +0100398{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700399 unsigned int hash = 0;
Willy Tarreaueee5b512015-04-03 23:46:31 +0200400 struct http_txn *txn = s->txn;
Benoitaffb4812009-03-25 13:02:10 +0100401 struct proxy *px = s->be;
402 unsigned int plen = px->hh_len;
403 unsigned long len;
404 struct hdr_ctx ctx;
405 const char *p;
Bhaskar98634f02013-10-29 23:30:51 -0400406 const char *start, *end;
Benoitaffb4812009-03-25 13:02:10 +0100407
408 /* tot_weight appears to mean srv_count */
409 if (px->lbprm.tot_weight == 0)
410 return NULL;
411
Benoitaffb4812009-03-25 13:02:10 +0100412 ctx.idx = 0;
413
414 /* if the message is chunked, we skip the chunk size, but use the value as len */
Willy Tarreau22ec1ea2014-11-27 20:45:39 +0100415 http_find_header2(px->hh_name, plen, b_ptr(s->req.buf, -http_hdr_rewind(&txn->req)), &txn->hdr_idx, &ctx);
Benoitaffb4812009-03-25 13:02:10 +0100416
417 /* if the header is not found or empty, let's fallback to round robin */
418 if (!ctx.idx || !ctx.vlen)
419 return NULL;
420
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200421 /* note: we won't hash if there's only one server left */
422 if (px->lbprm.tot_used == 1)
423 goto hash_done;
424
Benoitaffb4812009-03-25 13:02:10 +0100425 /* Found a the hh_name in the headers.
426 * we will compute the hash based on this value ctx.val.
427 */
428 len = ctx.vlen;
429 p = (char *)ctx.line + ctx.val;
430 if (!px->hh_match_domain) {
Bhaskar98634f02013-10-29 23:30:51 -0400431 hash = gen_hash(px, p, len);
Benoitaffb4812009-03-25 13:02:10 +0100432 } else {
433 int dohash = 0;
Cyril Bontéf607d812015-01-04 15:17:36 +0100434 p += len;
Benoitaffb4812009-03-25 13:02:10 +0100435 /* special computation, use only main domain name, not tld/host
436 * going back from the end of string, start hashing at first
437 * dot stop at next.
438 * This is designed to work with the 'Host' header, and requires
439 * a special option to activate this.
440 */
Cyril Bontéf607d812015-01-04 15:17:36 +0100441 end = p;
Benoitaffb4812009-03-25 13:02:10 +0100442 while (len) {
Cyril Bontéf607d812015-01-04 15:17:36 +0100443 if (dohash) {
444 /* Rewind the pointer until the previous char
445 * is a dot, this will allow to set the start
446 * position of the domain. */
447 if (*(p - 1) == '.')
Benoitaffb4812009-03-25 13:02:10 +0100448 break;
Benoitaffb4812009-03-25 13:02:10 +0100449 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100450 else if (*p == '.') {
451 /* The pointer is rewinded to the dot before the
452 * tld, we memorize the end of the domain and
453 * can enter the domain processing. */
454 end = p;
455 dohash = 1;
456 }
Benoitaffb4812009-03-25 13:02:10 +0100457 p--;
Cyril Bontéf607d812015-01-04 15:17:36 +0100458 len--;
Benoitaffb4812009-03-25 13:02:10 +0100459 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100460 start = p;
Bhaskar98634f02013-10-29 23:30:51 -0400461 hash = gen_hash(px, start, (end - start));
Benoitaffb4812009-03-25 13:02:10 +0100462 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500463 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100464 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200465 hash_done:
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200466 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
467 return chash_get_server_hash(px, hash);
468 else
469 return map_get_server_hash(px, hash);
Benoitaffb4812009-03-25 13:02:10 +0100470}
471
Willy Tarreau34db1082012-04-19 17:16:54 +0200472/* RDP Cookie HASH. */
Christopher Faulet8fe48912017-06-09 14:23:09 +0200473static struct server *get_server_rch(struct stream *s)
Emeric Brun736aa232009-06-30 17:56:00 +0200474{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700475 unsigned int hash = 0;
Emeric Brun736aa232009-06-30 17:56:00 +0200476 struct proxy *px = s->be;
477 unsigned long len;
Emeric Brun736aa232009-06-30 17:56:00 +0200478 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +0200479 struct sample smp;
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200480 int rewind;
Emeric Brun736aa232009-06-30 17:56:00 +0200481
482 /* tot_weight appears to mean srv_count */
483 if (px->lbprm.tot_weight == 0)
484 return NULL;
485
Willy Tarreau37406352012-04-23 16:16:37 +0200486 memset(&smp, 0, sizeof(smp));
Emeric Brun736aa232009-06-30 17:56:00 +0200487
Willy Tarreau22ec1ea2014-11-27 20:45:39 +0100488 b_rew(s->req.buf, rewind = s->req.buf->o);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200489
Willy Tarreaucadd8c92013-07-22 18:09:52 +0200490 ret = fetch_rdp_cookie_name(s, &smp, px->hh_name, px->hh_len);
Thierry FOURNIER136f9d32015-08-19 09:07:19 +0200491 len = smp.data.u.str.len;
Willy Tarreau664092c2011-12-16 19:11:42 +0100492
Willy Tarreau22ec1ea2014-11-27 20:45:39 +0100493 b_adv(s->req.buf, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200494
Willy Tarreau37406352012-04-23 16:16:37 +0200495 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || len == 0)
Emeric Brun736aa232009-06-30 17:56:00 +0200496 return NULL;
497
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200498 /* note: we won't hash if there's only one server left */
499 if (px->lbprm.tot_used == 1)
500 goto hash_done;
501
Emeric Brun736aa232009-06-30 17:56:00 +0200502 /* Found a the hh_name in the headers.
503 * we will compute the hash based on this value ctx.val.
504 */
Thierry FOURNIER136f9d32015-08-19 09:07:19 +0200505 hash = gen_hash(px, smp.data.u.str.str, len);
Bhaskar98634f02013-10-29 23:30:51 -0400506
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500507 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100508 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200509 hash_done:
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200510 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
511 return chash_get_server_hash(px, hash);
512 else
513 return map_get_server_hash(px, hash);
Emeric Brun736aa232009-06-30 17:56:00 +0200514}
Christopher Faulet5b517552017-06-09 14:17:53 +0200515
Benoitaffb4812009-03-25 13:02:10 +0100516/*
Willy Tarreau87b09662015-04-03 00:22:06 +0200517 * This function applies the load-balancing algorithm to the stream, as
518 * defined by the backend it is assigned to. The stream is then marked as
Willy Tarreau7c669d72008-06-20 15:04:11 +0200519 * 'assigned'.
520 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200521 * This function MAY NOT be called with SF_ASSIGNED already set. If the stream
Willy Tarreau7c669d72008-06-20 15:04:11 +0200522 * had a server previously assigned, it is rebalanced, trying to avoid the same
Willy Tarreau827aee92011-03-10 16:55:02 +0100523 * server, which should still be present in target_srv(&s->target) before the call.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200524 * The function tries to keep the original connection slot if it reconnects to
525 * the same server, otherwise it releases it and tries to offer it.
526 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200527 * It is illegal to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200528 *
529 * It may return :
Willy Tarreau664beb82011-03-10 11:38:29 +0100530 * SRV_STATUS_OK if everything is OK. ->srv and ->target are assigned.
Willy Tarreau87b09662015-04-03 00:22:06 +0200531 * SRV_STATUS_NOSRV if no server is available. Stream is not ASSIGNED
532 * SRV_STATUS_FULL if all servers are saturated. Stream is not ASSIGNED
Willy Tarreaubaaee002006-06-26 02:48:02 +0200533 * SRV_STATUS_INTERNAL for other unrecoverable errors.
534 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200535 * Upon successful return, the stream flag SF_ASSIGNED is set to indicate that
Willy Tarreau827aee92011-03-10 16:55:02 +0100536 * it does not need to be called anymore. This means that target_srv(&s->target)
537 * can be trusted in balance and direct modes.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200538 *
539 */
540
Willy Tarreau87b09662015-04-03 00:22:06 +0200541int assign_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200542{
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200543 struct connection *conn;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200544 struct server *conn_slot;
Willy Tarreau827aee92011-03-10 16:55:02 +0100545 struct server *srv, *prev_srv;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200546 int err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100547
Simon Horman8effd3d2011-08-13 08:03:52 +0900548 DPRINTF(stderr,"assign_server : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200549
Willy Tarreau7c669d72008-06-20 15:04:11 +0200550 err = SRV_STATUS_INTERNAL;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200551 if (unlikely(s->pend_pos || s->flags & SF_ASSIGNED))
Willy Tarreau7c669d72008-06-20 15:04:11 +0200552 goto out_err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100553
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100554 prev_srv = objt_server(s->target);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200555 conn_slot = s->srv_conn;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200556
Willy Tarreau7c669d72008-06-20 15:04:11 +0200557 /* We have to release any connection slot before applying any LB algo,
558 * otherwise we may erroneously end up with no available slot.
559 */
560 if (conn_slot)
561 sess_change_server(s, NULL);
562
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100563 /* We will now try to find the good server and store it into <objt_server(s->target)>.
564 * Note that <objt_server(s->target)> may be NULL in case of dispatch or proxy mode,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200565 * as well as if no server is available (check error code).
566 */
Willy Tarreau1a20a5d2007-11-01 21:08:19 +0100567
Willy Tarreau827aee92011-03-10 16:55:02 +0100568 srv = NULL;
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100569 s->target = NULL;
Olivier Houchard9aaf7782017-09-13 18:30:23 +0200570 conn = cs_conn(objt_cs(s->si[1].end));
Willy Tarreau664beb82011-03-10 11:38:29 +0100571
Willy Tarreau068621e2013-12-23 15:11:25 +0100572 if (conn &&
Willy Tarreau2481d162014-02-19 18:40:43 +0100573 (conn->flags & CO_FL_CONNECTED) &&
Willy Tarreau9420b122013-12-15 18:58:25 +0100574 objt_server(conn->target) && __objt_server(conn->target)->proxy == s->be &&
Willy Tarreaueee5b512015-04-03 23:46:31 +0200575 ((s->txn && s->txn->flags & TX_PREFER_LAST) ||
Willy Tarreauc35362a2014-04-25 13:58:37 +0200576 ((s->be->options & PR_O_PREF_LAST) &&
Olivier Doucet1ca1b6f2017-01-02 11:48:57 +0100577 (s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI &&
Willy Tarreauc35362a2014-04-25 13:58:37 +0200578 (!s->be->max_ka_queue ||
579 server_has_room(__objt_server(conn->target)) ||
580 (__objt_server(conn->target)->nbpend + 1) < s->be->max_ka_queue))) &&
Emeric Brun52a91d32017-08-31 14:41:55 +0200581 srv_currently_usable(__objt_server(conn->target))) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200582 /* This stream was relying on a server in a previous request
Olivier Doucet1ca1b6f2017-01-02 11:48:57 +0100583 * and the proxy has "option prefer-last-server" set
584 * and balance algorithm dont tell us to do otherwise, so
Willy Tarreau9420b122013-12-15 18:58:25 +0100585 * let's try to reuse the same server.
586 */
587 srv = __objt_server(conn->target);
588 s->target = &srv->obj_type;
589 }
590 else if (s->be->lbprm.algo & BE_LB_KIND) {
Christopher Faulet5b517552017-06-09 14:17:53 +0200591
Willy Tarreau7c669d72008-06-20 15:04:11 +0200592 /* we must check if we have at least one server available */
593 if (!s->be->lbprm.tot_weight) {
594 err = SRV_STATUS_NOSRV;
595 goto out;
596 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200597
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200598 /* First check whether we need to fetch some data or simply call
599 * the LB lookup function. Only the hashing functions will need
600 * some input data in fact, and will support multiple algorithms.
601 */
602 switch (s->be->lbprm.algo & BE_LB_LKUP) {
603 case BE_LB_LKUP_RRTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100604 srv = fwrr_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200605 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200606
Willy Tarreauf09c6602012-02-13 17:12:08 +0100607 case BE_LB_LKUP_FSTREE:
608 srv = fas_get_next_server(s->be, prev_srv);
609 break;
610
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200611 case BE_LB_LKUP_LCTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100612 srv = fwlc_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200613 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200614
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200615 case BE_LB_LKUP_CHTREE:
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200616 case BE_LB_LKUP_MAP:
Willy Tarreau9757a382009-10-03 12:56:50 +0200617 if ((s->be->lbprm.algo & BE_LB_KIND) == BE_LB_KIND_RR) {
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200618 if (s->be->lbprm.algo & BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100619 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200620 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100621 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau9757a382009-10-03 12:56:50 +0200622 break;
623 }
624 else if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200625 /* unknown balancing algorithm */
Willy Tarreau7c669d72008-06-20 15:04:11 +0200626 err = SRV_STATUS_INTERNAL;
627 goto out;
628 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200629
630 switch (s->be->lbprm.algo & BE_LB_PARM) {
631 case BE_LB_HASH_SRC:
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200632 conn = objt_conn(strm_orig(s));
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200633 if (conn && conn->addr.from.ss_family == AF_INET) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200634 srv = get_server_sh(s->be,
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200635 (void *)&((struct sockaddr_in *)&conn->addr.from)->sin_addr,
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200636 4);
637 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200638 else if (conn && conn->addr.from.ss_family == AF_INET6) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200639 srv = get_server_sh(s->be,
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200640 (void *)&((struct sockaddr_in6 *)&conn->addr.from)->sin6_addr,
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200641 16);
642 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200643 else {
644 /* unknown IP family */
645 err = SRV_STATUS_INTERNAL;
646 goto out;
647 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200648 break;
649
650 case BE_LB_HASH_URI:
651 /* URI hashing */
Willy Tarreaueee5b512015-04-03 23:46:31 +0200652 if (!s->txn || s->txn->req.msg_state < HTTP_MSG_BODY)
Willy Tarreaueaed5a12010-03-24 14:54:30 +0100653 break;
Willy Tarreau827aee92011-03-10 16:55:02 +0100654 srv = get_server_uh(s->be,
Willy Tarreaueee5b512015-04-03 23:46:31 +0200655 b_ptr(s->req.buf, -http_uri_rewind(&s->txn->req)),
656 s->txn->req.sl.rq.u_l);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200657 break;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200658
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200659 case BE_LB_HASH_PRM:
660 /* URL Parameter hashing */
Willy Tarreaueee5b512015-04-03 23:46:31 +0200661 if (!s->txn || s->txn->req.msg_state < HTTP_MSG_BODY)
Willy Tarreaueaed5a12010-03-24 14:54:30 +0100662 break;
Willy Tarreau61a21a32011-03-01 20:35:49 +0100663
Willy Tarreau827aee92011-03-10 16:55:02 +0100664 srv = get_server_ph(s->be,
Willy Tarreaueee5b512015-04-03 23:46:31 +0200665 b_ptr(s->req.buf, -http_uri_rewind(&s->txn->req)),
666 s->txn->req.sl.rq.u_l);
Willy Tarreau61a21a32011-03-01 20:35:49 +0100667
Willy Tarreaueee5b512015-04-03 23:46:31 +0200668 if (!srv && s->txn->meth == HTTP_METH_POST)
Willy Tarreau827aee92011-03-10 16:55:02 +0100669 srv = get_server_ph_post(s);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200670 break;
Benoitaffb4812009-03-25 13:02:10 +0100671
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200672 case BE_LB_HASH_HDR:
673 /* Header Parameter hashing */
Willy Tarreaueee5b512015-04-03 23:46:31 +0200674 if (!s->txn || s->txn->req.msg_state < HTTP_MSG_BODY)
Willy Tarreaueaed5a12010-03-24 14:54:30 +0100675 break;
Willy Tarreau827aee92011-03-10 16:55:02 +0100676 srv = get_server_hh(s);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200677 break;
678
679 case BE_LB_HASH_RDP:
680 /* RDP Cookie hashing */
Willy Tarreau827aee92011-03-10 16:55:02 +0100681 srv = get_server_rch(s);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200682 break;
683
684 default:
685 /* unknown balancing algorithm */
686 err = SRV_STATUS_INTERNAL;
687 goto out;
Benoitaffb4812009-03-25 13:02:10 +0100688 }
Emeric Brun736aa232009-06-30 17:56:00 +0200689
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200690 /* If the hashing parameter was not found, let's fall
691 * back to round robin on the map.
692 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100693 if (!srv) {
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200694 if (s->be->lbprm.algo & BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100695 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200696 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100697 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200698 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200699
700 /* end of map-based LB */
Emeric Brun736aa232009-06-30 17:56:00 +0200701 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200702
Willy Tarreau7c669d72008-06-20 15:04:11 +0200703 default:
704 /* unknown balancing algorithm */
705 err = SRV_STATUS_INTERNAL;
706 goto out;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200707 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200708
Willy Tarreau827aee92011-03-10 16:55:02 +0100709 if (!srv) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200710 err = SRV_STATUS_FULL;
711 goto out;
712 }
Willy Tarreau827aee92011-03-10 16:55:02 +0100713 else if (srv != prev_srv) {
Christopher Fauletff8abcd2017-06-02 15:33:24 +0200714 HA_ATOMIC_ADD(&s->be->be_counters.cum_lbconn, 1);
Christopher Faulet29f77e82017-06-08 14:04:45 +0200715 HA_ATOMIC_ADD(&srv->counters.cum_lbconn, 1);
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100716 }
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100717 s->target = &srv->obj_type;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200718 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200719 else if (s->be->options & (PR_O_DISPATCH | PR_O_TRANSP)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100720 s->target = &s->be->obj_type;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200721 }
David du Colombier6f5ccb12011-03-10 22:26:24 +0100722 else if ((s->be->options & PR_O_HTTP_PROXY) &&
Olivier Houchard9aaf7782017-09-13 18:30:23 +0200723 conn && is_addr(&conn->addr.to)) {
Willy Tarreau664beb82011-03-10 11:38:29 +0100724 /* in proxy mode, we need a valid destination address */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100725 s->target = &s->be->obj_type;
Willy Tarreau664beb82011-03-10 11:38:29 +0100726 }
727 else {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200728 err = SRV_STATUS_NOSRV;
729 goto out;
730 }
731
Willy Tarreaue7dff022015-04-03 01:14:29 +0200732 s->flags |= SF_ASSIGNED;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200733 err = SRV_STATUS_OK;
734 out:
735
736 /* Either we take back our connection slot, or we offer it to someone
737 * else if we don't need it anymore.
738 */
739 if (conn_slot) {
Willy Tarreau827aee92011-03-10 16:55:02 +0100740 if (conn_slot == srv) {
741 sess_change_server(s, srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200742 } else {
743 if (may_dequeue_tasks(conn_slot, s->be))
744 process_srv_queue(conn_slot);
745 }
746 }
747
748 out_err:
749 return err;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200750}
751
Willy Tarreaubaaee002006-06-26 02:48:02 +0200752/*
Willy Tarreaue7dff022015-04-03 01:14:29 +0200753 * This function assigns a server address to a stream, and sets SF_ADDR_SET.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200754 * The address is taken from the currently assigned server, or from the
755 * dispatch or transparent address.
756 *
757 * It may return :
758 * SRV_STATUS_OK if everything is OK.
759 * SRV_STATUS_INTERNAL for other unrecoverable errors.
760 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200761 * Upon successful return, the stream flag SF_ADDR_SET is set. This flag is
Willy Tarreaubaaee002006-06-26 02:48:02 +0200762 * not cleared, so it's to the caller to clear it if required.
763 *
Willy Tarreau32e3c6a2013-10-11 19:34:20 +0200764 * The caller is responsible for having already assigned a connection
765 * to si->end.
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200766 *
Willy Tarreaubaaee002006-06-26 02:48:02 +0200767 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200768int assign_server_address(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200769{
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200770 struct connection *cli_conn = objt_conn(strm_orig(s));
Olivier Houchard9aaf7782017-09-13 18:30:23 +0200771 struct connection *srv_conn = cs_conn(objt_cs(s->si[1].end));
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200772
Willy Tarreaubaaee002006-06-26 02:48:02 +0200773#ifdef DEBUG_FULL
774 fprintf(stderr,"assign_server_address : s=%p\n",s);
775#endif
776
Willy Tarreaue7dff022015-04-03 01:14:29 +0200777 if ((s->flags & SF_DIRECT) || (s->be->lbprm.algo & BE_LB_KIND)) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200778 /* A server is necessarily known for this stream */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200779 if (!(s->flags & SF_ASSIGNED))
Willy Tarreaubaaee002006-06-26 02:48:02 +0200780 return SRV_STATUS_INTERNAL;
781
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200782 srv_conn->addr.to = objt_server(s->target)->addr;
Willy Tarreau04276f32017-01-06 17:41:29 +0100783 set_host_port(&srv_conn->addr.to, objt_server(s->target)->svc_port);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200784
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200785 if (!is_addr(&srv_conn->addr.to) && cli_conn) {
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200786 /* if the server has no address, we use the same address
787 * the client asked, which is handy for remapping ports
Willy Tarreau9cf8d3f2014-05-09 22:56:10 +0200788 * locally on multiple addresses at once. Nothing is done
789 * for AF_UNIX addresses.
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200790 */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200791 conn_get_to_addr(cli_conn);
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200792
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200793 if (cli_conn->addr.to.ss_family == AF_INET) {
794 ((struct sockaddr_in *)&srv_conn->addr.to)->sin_addr = ((struct sockaddr_in *)&cli_conn->addr.to)->sin_addr;
795 } else if (cli_conn->addr.to.ss_family == AF_INET6) {
796 ((struct sockaddr_in6 *)&srv_conn->addr.to)->sin6_addr = ((struct sockaddr_in6 *)&cli_conn->addr.to)->sin6_addr;
Emeric Brunec810d12010-10-22 16:36:33 +0200797 }
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200798 }
799
Willy Tarreaubaaee002006-06-26 02:48:02 +0200800 /* if this server remaps proxied ports, we'll use
801 * the port the client connected to with an offset. */
Willy Tarreauc93cd162014-05-13 15:54:22 +0200802 if ((objt_server(s->target)->flags & SRV_F_MAPPORTS) && cli_conn) {
David du Colombier6f5ccb12011-03-10 22:26:24 +0100803 int base_port;
804
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200805 conn_get_to_addr(cli_conn);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100806
807 /* First, retrieve the port from the incoming connection */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200808 base_port = get_host_port(&cli_conn->addr.to);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100809
810 /* Second, assign the outgoing connection's port */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200811 base_port += get_host_port(&srv_conn->addr.to);
812 set_host_port(&srv_conn->addr.to, base_port);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200813 }
814 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200815 else if (s->be->options & PR_O_DISPATCH) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200816 /* connect to the defined dispatch addr */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200817 srv_conn->addr.to = s->be->dispatch_addr;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200818 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200819 else if ((s->be->options & PR_O_TRANSP) && cli_conn) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200820 /* in transparent mode, use the original dest addr if no dispatch specified */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200821 conn_get_to_addr(cli_conn);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200822
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200823 if (cli_conn->addr.to.ss_family == AF_INET || cli_conn->addr.to.ss_family == AF_INET6)
824 srv_conn->addr.to = cli_conn->addr.to;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200825 }
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100826 else if (s->be->options & PR_O_HTTP_PROXY) {
827 /* If HTTP PROXY option is set, then server is already assigned
828 * during incoming client request parsing. */
829 }
Willy Tarreau1a1158b2007-01-20 11:07:46 +0100830 else {
831 /* no server and no LB algorithm ! */
832 return SRV_STATUS_INTERNAL;
833 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200834
KOVACS Krisztianb3e54fe2014-11-17 15:11:45 +0100835 /* Copy network namespace from client connection */
Thierry FOURNIERfe1ebcd2014-12-19 13:37:11 +0100836 srv_conn->proxy_netns = cli_conn ? cli_conn->proxy_netns : NULL;
KOVACS Krisztianb3e54fe2014-11-17 15:11:45 +0100837
Willy Tarreaue7dff022015-04-03 01:14:29 +0200838 s->flags |= SF_ADDR_SET;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200839 return SRV_STATUS_OK;
840}
841
Willy Tarreau87b09662015-04-03 00:22:06 +0200842/* This function assigns a server to stream <s> if required, and can add the
Willy Tarreaubaaee002006-06-26 02:48:02 +0200843 * connection to either the assigned server's queue or to the proxy's queue.
Willy Tarreau87b09662015-04-03 00:22:06 +0200844 * If ->srv_conn is set, the stream is first released from the server.
Willy Tarreaue7dff022015-04-03 01:14:29 +0200845 * It may also be called with SF_DIRECT and/or SF_ASSIGNED though. It will
Willy Tarreau7c669d72008-06-20 15:04:11 +0200846 * be called before any connection and after any retry or redispatch occurs.
847 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200848 * It is not allowed to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200849 *
850 * Returns :
851 *
852 * SRV_STATUS_OK if everything is OK.
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100853 * SRV_STATUS_NOSRV if no server is available. objt_server(s->target) = NULL.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200854 * SRV_STATUS_QUEUED if the connection has been queued.
855 * SRV_STATUS_FULL if the server(s) is/are saturated and the
Willy Tarreau827aee92011-03-10 16:55:02 +0100856 * connection could not be queued at the server's,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200857 * which may be NULL if we queue on the backend.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200858 * SRV_STATUS_INTERNAL for other unrecoverable errors.
859 *
860 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200861int assign_server_and_queue(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200862{
863 struct pendconn *p;
Willy Tarreau827aee92011-03-10 16:55:02 +0100864 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200865 int err;
866
867 if (s->pend_pos)
868 return SRV_STATUS_INTERNAL;
869
Willy Tarreau7c669d72008-06-20 15:04:11 +0200870 err = SRV_STATUS_OK;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200871 if (!(s->flags & SF_ASSIGNED)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100872 struct server *prev_srv = objt_server(s->target);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100873
Willy Tarreau7c669d72008-06-20 15:04:11 +0200874 err = assign_server(s);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100875 if (prev_srv) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200876 /* This stream was previously assigned to a server. We have to
877 * update the stream's and the server's stats :
Willy Tarreau7c669d72008-06-20 15:04:11 +0200878 * - if the server changed :
879 * - set TX_CK_DOWN if txn.flags was TX_CK_VALID
Willy Tarreaue7dff022015-04-03 01:14:29 +0200880 * - set SF_REDISP if it was successfully redispatched
Willy Tarreau7c669d72008-06-20 15:04:11 +0200881 * - increment srv->redispatches and be->redispatches
882 * - if the server remained the same : update retries.
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100883 */
884
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100885 if (prev_srv != objt_server(s->target)) {
Willy Tarreaueee5b512015-04-03 23:46:31 +0200886 if (s->txn && (s->txn->flags & TX_CK_MASK) == TX_CK_VALID) {
887 s->txn->flags &= ~TX_CK_MASK;
888 s->txn->flags |= TX_CK_DOWN;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200889 }
Willy Tarreaue7dff022015-04-03 01:14:29 +0200890 s->flags |= SF_REDISP;
Christopher Faulet29f77e82017-06-08 14:04:45 +0200891 HA_ATOMIC_ADD(&prev_srv->counters.redispatches, 1);
Christopher Fauletff8abcd2017-06-02 15:33:24 +0200892 HA_ATOMIC_ADD(&s->be->be_counters.redispatches, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200893 } else {
Christopher Faulet29f77e82017-06-08 14:04:45 +0200894 HA_ATOMIC_ADD(&prev_srv->counters.retries, 1);
Christopher Fauletff8abcd2017-06-02 15:33:24 +0200895 HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100896 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100897 }
898 }
899
Willy Tarreaubaaee002006-06-26 02:48:02 +0200900 switch (err) {
901 case SRV_STATUS_OK:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200902 /* we have SF_ASSIGNED set */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100903 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +0100904 if (!srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200905 return SRV_STATUS_OK; /* dispatch or proxy mode */
906
907 /* If we already have a connection slot, no need to check any queue */
Willy Tarreau827aee92011-03-10 16:55:02 +0100908 if (s->srv_conn == srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200909 return SRV_STATUS_OK;
910
Willy Tarreau87b09662015-04-03 00:22:06 +0200911 /* OK, this stream already has an assigned server, but no
Willy Tarreau7c669d72008-06-20 15:04:11 +0200912 * connection slot yet. Either it is a redispatch, or it was
913 * assigned from persistence information (direct mode).
914 */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200915 if ((s->flags & SF_REDIRECTABLE) && srv->rdr_len) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200916 /* server scheduled for redirection, and already assigned. We
917 * don't want to go further nor check the queue.
Willy Tarreau21d2af32008-02-14 20:25:24 +0100918 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100919 sess_change_server(s, srv); /* not really needed in fact */
Willy Tarreau21d2af32008-02-14 20:25:24 +0100920 return SRV_STATUS_OK;
921 }
922
Willy Tarreau87b09662015-04-03 00:22:06 +0200923 /* We might have to queue this stream if the assigned server is full.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200924 * We know we have to queue it into the server's queue, so if a maxqueue
925 * is set on the server, we must also check that the server's queue is
926 * not full, in which case we have to return FULL.
927 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100928 if (srv->maxconn &&
929 (srv->nbpend || srv->served >= srv_dynamic_maxconn(srv))) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200930
Willy Tarreau827aee92011-03-10 16:55:02 +0100931 if (srv->maxqueue > 0 && srv->nbpend >= srv->maxqueue)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200932 return SRV_STATUS_FULL;
933
Willy Tarreaubaaee002006-06-26 02:48:02 +0200934 p = pendconn_add(s);
935 if (p)
936 return SRV_STATUS_QUEUED;
937 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200938 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200939 }
Willy Tarreau7c669d72008-06-20 15:04:11 +0200940
941 /* OK, we can use this server. Let's reserve our place */
Willy Tarreau827aee92011-03-10 16:55:02 +0100942 sess_change_server(s, srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200943 return SRV_STATUS_OK;
944
945 case SRV_STATUS_FULL:
Willy Tarreau87b09662015-04-03 00:22:06 +0200946 /* queue this stream into the proxy's queue */
Willy Tarreaubaaee002006-06-26 02:48:02 +0200947 p = pendconn_add(s);
948 if (p)
949 return SRV_STATUS_QUEUED;
950 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200951 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200952
953 case SRV_STATUS_NOSRV:
Willy Tarreau7c669d72008-06-20 15:04:11 +0200954 return err;
955
Willy Tarreaubaaee002006-06-26 02:48:02 +0200956 case SRV_STATUS_INTERNAL:
957 return err;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200958
Willy Tarreaubaaee002006-06-26 02:48:02 +0200959 default:
960 return SRV_STATUS_INTERNAL;
961 }
Willy Tarreau5b6995c2008-01-13 16:31:17 +0100962}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200963
Willy Tarreaub1d67742010-03-29 19:36:59 +0200964/* If an explicit source binding is specified on the server and/or backend, and
965 * this source makes use of the transparent proxy, then it is extracted now and
Willy Tarreau87b09662015-04-03 00:22:06 +0200966 * assigned to the stream's pending connection. This function assumes that an
Willy Tarreau350f4872014-11-28 14:42:25 +0100967 * outgoing connection has already been assigned to s->si[1].end.
Willy Tarreaub1d67742010-03-29 19:36:59 +0200968 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200969static void assign_tproxy_address(struct stream *s)
Willy Tarreaub1d67742010-03-29 19:36:59 +0200970{
Willy Tarreau29fbe512015-08-20 19:35:14 +0200971#if defined(CONFIG_HAP_TRANSPARENT)
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100972 struct server *srv = objt_server(s->target);
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100973 struct conn_src *src;
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200974 struct connection *cli_conn;
Olivier Houchard9aaf7782017-09-13 18:30:23 +0200975 struct connection *srv_conn = cs_conn(objt_cs(s->si[1].end));
Willy Tarreau827aee92011-03-10 16:55:02 +0100976
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100977 if (srv && srv->conn_src.opts & CO_SRC_BIND)
978 src = &srv->conn_src;
979 else if (s->be->conn_src.opts & CO_SRC_BIND)
980 src = &s->be->conn_src;
981 else
982 return;
Willy Tarreau294c4732011-12-16 21:35:50 +0100983
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100984 switch (src->opts & CO_SRC_TPROXY_MASK) {
985 case CO_SRC_TPROXY_ADDR:
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200986 srv_conn->addr.from = src->tproxy_addr;
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100987 break;
988 case CO_SRC_TPROXY_CLI:
989 case CO_SRC_TPROXY_CIP:
990 /* FIXME: what can we do if the client connects in IPv6 or unix socket ? */
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200991 cli_conn = objt_conn(strm_orig(s));
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200992 if (cli_conn)
993 srv_conn->addr.from = cli_conn->addr.from;
994 else
995 memset(&srv_conn->addr.from, 0, sizeof(srv_conn->addr.from));
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100996 break;
997 case CO_SRC_TPROXY_DYN:
Willy Tarreaueee5b512015-04-03 23:46:31 +0200998 if (src->bind_hdr_occ && s->txn) {
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100999 char *vptr;
1000 int vlen;
1001 int rewind;
Willy Tarreau294c4732011-12-16 21:35:50 +01001002
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001003 /* bind to the IP in a header */
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001004 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_family = AF_INET;
1005 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_port = 0;
1006 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_addr.s_addr = 0;
Willy Tarreau294c4732011-12-16 21:35:50 +01001007
Willy Tarreaueee5b512015-04-03 23:46:31 +02001008 b_rew(s->req.buf, rewind = http_hdr_rewind(&s->txn->req));
1009 if (http_get_hdr(&s->txn->req, src->bind_hdr_name, src->bind_hdr_len,
1010 &s->txn->hdr_idx, src->bind_hdr_occ, NULL, &vptr, &vlen)) {
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001011 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_addr.s_addr =
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001012 htonl(inetaddr_host_lim(vptr, vptr + vlen));
Willy Tarreaubce70882009-09-07 11:51:47 +02001013 }
Willy Tarreau22ec1ea2014-11-27 20:45:39 +01001014 b_adv(s->req.buf, rewind);
Willy Tarreaub1d67742010-03-29 19:36:59 +02001015 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001016 break;
1017 default:
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001018 memset(&srv_conn->addr.from, 0, sizeof(srv_conn->addr.from));
Willy Tarreaub1d67742010-03-29 19:36:59 +02001019 }
1020#endif
1021}
1022
1023
Willy Tarreaubaaee002006-06-26 02:48:02 +02001024/*
Willy Tarreau87b09662015-04-03 00:22:06 +02001025 * This function initiates a connection to the server assigned to this stream
Willy Tarreau350f4872014-11-28 14:42:25 +01001026 * (s->target, s->si[1].addr.to). It will assign a server if none
Willy Tarreau664beb82011-03-10 11:38:29 +01001027 * is assigned yet.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001028 * It can return one of :
Willy Tarreaue7dff022015-04-03 01:14:29 +02001029 * - SF_ERR_NONE if everything's OK
1030 * - SF_ERR_SRVTO if there are no more servers
1031 * - SF_ERR_SRVCL if the connection was refused by the server
1032 * - SF_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
1033 * - SF_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
1034 * - SF_ERR_INTERNAL for any other purely internal errors
Tim Düsterhus4896c442016-11-29 02:15:19 +01001035 * Additionally, in the case of SF_ERR_RESOURCE, an emergency log will be emitted.
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001036 * The server-facing stream interface is expected to hold a pre-allocated connection
Willy Tarreau350f4872014-11-28 14:42:25 +01001037 * in s->si[1].conn.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001038 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001039int connect_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001040{
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001041 struct connection *cli_conn;
Willy Tarreau34601a82013-12-15 16:33:46 +01001042 struct connection *srv_conn;
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001043 struct conn_stream *srv_cs;
1044 struct conn_stream *old_cs;
Willy Tarreau827aee92011-03-10 16:55:02 +01001045 struct server *srv;
Willy Tarreau34601a82013-12-15 16:33:46 +01001046 int reuse = 0;
Willy Tarreau9650f372009-08-16 14:02:45 +02001047 int err;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001048
Willy Tarreau7b004922015-08-04 19:34:21 +02001049 srv = objt_server(s->target);
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001050 srv_cs = objt_cs(s->si[1].end);
1051 srv_conn = cs_conn(srv_cs);
Willy Tarreau34601a82013-12-15 16:33:46 +01001052 if (srv_conn)
1053 reuse = s->target == srv_conn->target;
1054
Willy Tarreau8dff9982015-08-04 20:45:52 +02001055 if (srv && !reuse) {
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001056 old_cs = srv_cs;
1057 if (old_cs) {
Willy Tarreau8dff9982015-08-04 20:45:52 +02001058 srv_conn = NULL;
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001059 srv_cs->data = NULL;
Willy Tarreauefb90f92015-08-06 11:37:10 +02001060 si_detach_endpoint(&s->si[1]);
1061 /* note: if the connection was in a server's idle
1062 * queue, it doesn't get dequeued.
1063 */
Willy Tarreau8dff9982015-08-04 20:45:52 +02001064 }
1065
Willy Tarreau449d74a2015-08-05 17:16:33 +02001066 /* Below we pick connections from the safe or idle lists based
1067 * on the strategy, the fact that this is a first or second
1068 * (retryable) request, with the indicated priority (1 or 2) :
1069 *
1070 * SAFE AGGR ALWS
1071 *
1072 * +-----+-----+ +-----+-----+ +-----+-----+
1073 * req| 1st | 2nd | req| 1st | 2nd | req| 1st | 2nd |
1074 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1075 * safe| - | 2 | safe| 1 | 2 | safe| 1 | 2 |
1076 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1077 * idle| - | 1 | idle| - | 1 | idle| 2 | 1 |
1078 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1079 */
Christopher Faulet40a007c2017-07-03 15:41:01 +02001080 if (srv->idle_conns && !LIST_ISEMPTY(&srv->idle_conns[tid]) &&
Willy Tarreau449d74a2015-08-05 17:16:33 +02001081 ((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR &&
1082 s->txn && (s->txn->flags & TX_NOT_FIRST))) {
Christopher Faulet40a007c2017-07-03 15:41:01 +02001083 srv_conn = LIST_ELEM(srv->idle_conns[tid].n, struct connection *, list);
Willy Tarreau449d74a2015-08-05 17:16:33 +02001084 }
Christopher Faulet40a007c2017-07-03 15:41:01 +02001085 else if (srv->safe_conns && !LIST_ISEMPTY(&srv->safe_conns[tid]) &&
Willy Tarreau449d74a2015-08-05 17:16:33 +02001086 ((s->txn && (s->txn->flags & TX_NOT_FIRST)) ||
1087 (s->be->options & PR_O_REUSE_MASK) >= PR_O_REUSE_AGGR)) {
Christopher Faulet40a007c2017-07-03 15:41:01 +02001088 srv_conn = LIST_ELEM(srv->safe_conns[tid].n, struct connection *, list);
Willy Tarreau449d74a2015-08-05 17:16:33 +02001089 }
Christopher Faulet40a007c2017-07-03 15:41:01 +02001090 else if (srv->idle_conns && !LIST_ISEMPTY(&srv->idle_conns[tid]) &&
Willy Tarreau449d74a2015-08-05 17:16:33 +02001091 (s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) {
Christopher Faulet40a007c2017-07-03 15:41:01 +02001092 srv_conn = LIST_ELEM(srv->idle_conns[tid].n, struct connection *, list);
Willy Tarreau449d74a2015-08-05 17:16:33 +02001093 }
Willy Tarreau8dff9982015-08-04 20:45:52 +02001094
Willy Tarreau449d74a2015-08-05 17:16:33 +02001095 /* If we've picked a connection from the pool, we now have to
1096 * detach it. We may have to get rid of the previous idle
1097 * connection we had, so for this we try to swap it with the
1098 * other owner's. That way it may remain alive for others to
1099 * pick.
1100 */
1101 if (srv_conn) {
Willy Tarreau8dff9982015-08-04 20:45:52 +02001102 LIST_DEL(&srv_conn->list);
1103 LIST_INIT(&srv_conn->list);
1104
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001105 /* XXX cognet: this assumes only 1 conn_stream per
1106 * connection, has to be revisited later
1107 */
1108 srv_cs = srv_conn->mux_ctx;
1109
1110 if (srv_conn->mux == &mux_pt_ops && srv_cs->data) {
1111 si_detach_endpoint(srv_cs->data);
1112 if (old_cs && !(old_cs->conn->flags & CO_FL_PRIVATE)) {
1113 si_attach_cs(srv_cs->data, old_cs);
1114 si_idle_cs(srv_cs->data, NULL);
Willy Tarreau0aae4802016-02-02 18:29:05 +01001115 }
Willy Tarreauefb90f92015-08-06 11:37:10 +02001116 }
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001117 si_attach_cs(&s->si[1], srv_cs);
Willy Tarreau8dff9982015-08-04 20:45:52 +02001118 reuse = 1;
1119 }
Willy Tarreauefb90f92015-08-06 11:37:10 +02001120
Willy Tarreau449d74a2015-08-05 17:16:33 +02001121 /* we may have to release our connection if we couldn't swap it */
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001122 if (old_cs && !old_cs->data)
1123 cs_destroy(old_cs);
Willy Tarreau8dff9982015-08-04 20:45:52 +02001124 }
1125
Willy Tarreau34601a82013-12-15 16:33:46 +01001126 if (reuse) {
1127 /* Disable connection reuse if a dynamic source is used.
1128 * As long as we don't share connections between servers,
1129 * we don't need to disable connection reuse on no-idempotent
1130 * requests nor when PROXY protocol is used.
1131 */
Willy Tarreau34601a82013-12-15 16:33:46 +01001132 if (srv && srv->conn_src.opts & CO_SRC_BIND) {
1133 if ((srv->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1134 reuse = 0;
1135 }
1136 else if (s->be->conn_src.opts & CO_SRC_BIND) {
1137 if ((s->be->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1138 reuse = 0;
1139 }
1140 }
1141
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001142 if (!reuse) {
1143 srv_cs = si_alloc_cs(&s->si[1], NULL);
1144 srv_conn = cs_conn(srv_cs);
1145 } else {
Willy Tarreau323a2d92015-08-04 19:00:17 +02001146 /* reusing our connection, take it out of the idle list */
1147 LIST_DEL(&srv_conn->list);
1148 LIST_INIT(&srv_conn->list);
1149 }
Willy Tarreauc12b5e62015-08-04 19:45:36 +02001150
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001151 if (!srv_cs)
Willy Tarreaue7dff022015-04-03 01:14:29 +02001152 return SF_ERR_RESOURCE;
Willy Tarreau32e3c6a2013-10-11 19:34:20 +02001153
Willy Tarreaue7dff022015-04-03 01:14:29 +02001154 if (!(s->flags & SF_ADDR_SET)) {
Willy Tarreaubaaee002006-06-26 02:48:02 +02001155 err = assign_server_address(s);
1156 if (err != SRV_STATUS_OK)
Willy Tarreaue7dff022015-04-03 01:14:29 +02001157 return SF_ERR_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001158 }
1159
Willy Tarreauff605db2013-12-20 11:09:51 +01001160 if (!conn_xprt_ready(srv_conn)) {
Willy Tarreau87b09662015-04-03 00:22:06 +02001161 /* the target was only on the stream, assign it to the SI now */
Willy Tarreauff605db2013-12-20 11:09:51 +01001162 srv_conn->target = s->target;
Willy Tarreaud88edf22009-06-14 15:48:17 +02001163
Willy Tarreauff605db2013-12-20 11:09:51 +01001164 /* set the correct protocol on the output stream interface */
Willy Tarreau7b004922015-08-04 19:34:21 +02001165 if (srv) {
1166 conn_prepare(srv_conn, protocol_by_family(srv_conn->addr.to.ss_family), srv->xprt);
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001167 /* XXX: Pick the right mux, when we finally have one */
1168 conn_install_mux(srv_conn, &mux_pt_ops, srv_cs);
Willy Tarreauff605db2013-12-20 11:09:51 +01001169 }
1170 else if (obj_type(s->target) == OBJ_TYPE_PROXY) {
1171 /* proxies exclusively run on raw_sock right now */
Willy Tarreaua261e9b2016-12-22 20:44:00 +01001172 conn_prepare(srv_conn, protocol_by_family(srv_conn->addr.to.ss_family), xprt_get(XPRT_RAW));
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001173 if (!objt_cs(s->si[1].end) || !objt_cs(s->si[1].end)->conn->ctrl)
Willy Tarreaue7dff022015-04-03 01:14:29 +02001174 return SF_ERR_INTERNAL;
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001175 /* XXX: Pick the right mux, when we finally have one */
1176 conn_install_mux(srv_conn, &mux_pt_ops, srv_cs);
Willy Tarreauff605db2013-12-20 11:09:51 +01001177 }
1178 else
Willy Tarreaue7dff022015-04-03 01:14:29 +02001179 return SF_ERR_INTERNAL; /* how did we get there ? */
Willy Tarreaud02394b2012-05-11 18:32:18 +02001180
Willy Tarreauff605db2013-12-20 11:09:51 +01001181 /* process the case where the server requires the PROXY protocol to be sent */
1182 srv_conn->send_proxy_ofs = 0;
Willy Tarreau7b004922015-08-04 19:34:21 +02001183 if (srv && srv->pp_opts) {
Willy Tarreau387ebf82015-08-04 19:24:13 +02001184 srv_conn->flags |= CO_FL_PRIVATE;
Willy Tarreauff605db2013-12-20 11:09:51 +01001185 srv_conn->send_proxy_ofs = 1; /* must compute size */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001186 cli_conn = objt_conn(strm_orig(s));
Willy Tarreauff605db2013-12-20 11:09:51 +01001187 if (cli_conn)
1188 conn_get_to_addr(cli_conn);
1189 }
Willy Tarreau2a6e8802013-10-24 15:50:53 +02001190
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001191 si_attach_cs(&s->si[1], srv_cs);
Willy Tarreau26d8c592012-05-07 18:12:14 +02001192
Willy Tarreauff605db2013-12-20 11:09:51 +01001193 assign_tproxy_address(s);
1194 }
1195 else {
1196 /* the connection is being reused, just re-attach it */
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001197 si_attach_cs(&s->si[1], srv_cs);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001198 s->flags |= SF_SRV_REUSED;
Willy Tarreauff605db2013-12-20 11:09:51 +01001199 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001200
William Lallemandb7ff6a32012-03-02 14:35:21 +01001201 /* flag for logging source ip/port */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001202 if (strm_fe(s)->options2 & PR_O2_SRC_ADDR)
Willy Tarreau350f4872014-11-28 14:42:25 +01001203 s->si[1].flags |= SI_FL_SRC_ADDR;
William Lallemandb7ff6a32012-03-02 14:35:21 +01001204
Willy Tarreau14f8e862012-08-30 22:23:13 +02001205 /* disable lingering */
1206 if (s->be->options & PR_O_TCP_NOLING)
Willy Tarreau350f4872014-11-28 14:42:25 +01001207 s->si[1].flags |= SI_FL_NOLINGER;
Willy Tarreau14f8e862012-08-30 22:23:13 +02001208
Willy Tarreau350f4872014-11-28 14:42:25 +01001209 err = si_connect(&s->si[1]);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001210
Willy Tarreaue7dff022015-04-03 01:14:29 +02001211 if (err != SF_ERR_NONE)
Willy Tarreau9650f372009-08-16 14:02:45 +02001212 return err;
Willy Tarreau788e2842008-08-26 13:25:39 +02001213
Willy Tarreau14f8e862012-08-30 22:23:13 +02001214 /* set connect timeout */
Willy Tarreau350f4872014-11-28 14:42:25 +01001215 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.connect);
Willy Tarreau14f8e862012-08-30 22:23:13 +02001216
Willy Tarreau827aee92011-03-10 16:55:02 +01001217 if (srv) {
Christopher Faulet29f77e82017-06-08 14:04:45 +02001218 int count;
1219
Willy Tarreaue7dff022015-04-03 01:14:29 +02001220 s->flags |= SF_CURR_SESS;
Christopher Faulet29f77e82017-06-08 14:04:45 +02001221 count = HA_ATOMIC_ADD(&srv->cur_sess, 1);
1222 HA_ATOMIC_UPDATE_MAX(&srv->counters.cur_sess_max, count);
Willy Tarreau51406232008-03-10 22:04:20 +01001223 if (s->be->lbprm.server_take_conn)
Willy Tarreau827aee92011-03-10 16:55:02 +01001224 s->be->lbprm.server_take_conn(srv);
Willy Tarreau732eac42015-07-09 11:40:25 +02001225
1226#ifdef USE_OPENSSL
1227 if (srv->ssl_ctx.sni) {
1228 struct sample *smp;
1229 int rewind;
1230
1231 /* Tricky case : we have already scheduled the pending
1232 * HTTP request or TCP data for leaving. So in HTTP we
1233 * rewind exactly the headers, otherwise we rewind the
1234 * output data.
1235 */
1236 rewind = s->txn ? http_hdr_rewind(&s->txn->req) : s->req.buf->o;
1237 b_rew(s->req.buf, rewind);
1238
1239 smp = sample_fetch_as_type(s->be, s->sess, s, SMP_OPT_DIR_REQ | SMP_OPT_FINAL, srv->ssl_ctx.sni, SMP_T_STR);
1240
1241 /* restore the pointers */
1242 b_adv(s->req.buf, rewind);
1243
Willy Tarreau2e0565c2016-08-09 11:55:21 +02001244 if (smp_make_safe(smp)) {
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001245 ssl_sock_set_servername(srv_conn, smp->data.u.str.str);
Willy Tarreau387ebf82015-08-04 19:24:13 +02001246 srv_conn->flags |= CO_FL_PRIVATE;
Willy Tarreau732eac42015-07-09 11:40:25 +02001247 }
1248 }
1249#endif /* USE_OPENSSL */
1250
Willy Tarreaubaaee002006-06-26 02:48:02 +02001251 }
1252
Willy Tarreaue7dff022015-04-03 01:14:29 +02001253 return SF_ERR_NONE; /* connection is OK */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001254}
1255
1256
Willy Tarreaubaaee002006-06-26 02:48:02 +02001257/* This function performs the "redispatch" part of a connection attempt. It
1258 * will assign a server if required, queue the connection if required, and
1259 * handle errors that might arise at this level. It can change the server
1260 * state. It will return 1 if it encounters an error, switches the server
1261 * state, or has to queue a connection. Otherwise, it will return 0 indicating
1262 * that the connection is ready to use.
1263 */
1264
Willy Tarreau87b09662015-04-03 00:22:06 +02001265int srv_redispatch_connect(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001266{
Willy Tarreau827aee92011-03-10 16:55:02 +01001267 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001268 int conn_err;
1269
1270 /* We know that we don't have any connection pending, so we will
1271 * try to get a new one, and wait in this state if it's queued
1272 */
Willy Tarreau7c669d72008-06-20 15:04:11 +02001273 redispatch:
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001274 conn_err = assign_server_and_queue(s);
1275 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +01001276
Willy Tarreaubaaee002006-06-26 02:48:02 +02001277 switch (conn_err) {
1278 case SRV_STATUS_OK:
1279 break;
1280
Willy Tarreau7c669d72008-06-20 15:04:11 +02001281 case SRV_STATUS_FULL:
1282 /* The server has reached its maxqueue limit. Either PR_O_REDISP is set
1283 * and we can redispatch to another server, or it is not and we return
1284 * 503. This only makes sense in DIRECT mode however, because normal LB
1285 * algorithms would never select such a server, and hash algorithms
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001286 * would bring us on the same server again. Note that s->target is set
Willy Tarreau827aee92011-03-10 16:55:02 +01001287 * in this case.
Willy Tarreau7c669d72008-06-20 15:04:11 +02001288 */
Willy Tarreaue7dff022015-04-03 01:14:29 +02001289 if (((s->flags & (SF_DIRECT|SF_FORCE_PRST)) == SF_DIRECT) &&
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001290 (s->be->options & PR_O_REDISP)) {
Willy Tarreaue7dff022015-04-03 01:14:29 +02001291 s->flags &= ~(SF_DIRECT | SF_ASSIGNED | SF_ADDR_SET);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001292 goto redispatch;
1293 }
1294
Willy Tarreau350f4872014-11-28 14:42:25 +01001295 if (!s->si[1].err_type) {
1296 s->si[1].err_type = SI_ET_QUEUE_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001297 }
Willy Tarreau7c669d72008-06-20 15:04:11 +02001298
Christopher Faulet29f77e82017-06-08 14:04:45 +02001299 HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
Christopher Fauletff8abcd2017-06-02 15:33:24 +02001300 HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001301 return 1;
1302
Willy Tarreaubaaee002006-06-26 02:48:02 +02001303 case SRV_STATUS_NOSRV:
Willy Tarreau827aee92011-03-10 16:55:02 +01001304 /* note: it is guaranteed that srv == NULL here */
Willy Tarreau350f4872014-11-28 14:42:25 +01001305 if (!s->si[1].err_type) {
1306 s->si[1].err_type = SI_ET_CONN_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001307 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +01001308
Christopher Fauletff8abcd2017-06-02 15:33:24 +02001309 HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001310 return 1;
1311
1312 case SRV_STATUS_QUEUED:
Willy Tarreau350f4872014-11-28 14:42:25 +01001313 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.queue);
1314 s->si[1].state = SI_ST_QUE;
Willy Tarreau87b09662015-04-03 00:22:06 +02001315 /* do nothing else and do not wake any other stream up */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001316 return 1;
1317
Willy Tarreaubaaee002006-06-26 02:48:02 +02001318 case SRV_STATUS_INTERNAL:
1319 default:
Willy Tarreau350f4872014-11-28 14:42:25 +01001320 if (!s->si[1].err_type) {
1321 s->si[1].err_type = SI_ET_CONN_OTHER;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001322 }
1323
Willy Tarreau827aee92011-03-10 16:55:02 +01001324 if (srv)
1325 srv_inc_sess_ctr(srv);
1326 if (srv)
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -05001327 srv_set_sess_last(srv);
1328 if (srv)
Christopher Faulet29f77e82017-06-08 14:04:45 +02001329 HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
Christopher Fauletff8abcd2017-06-02 15:33:24 +02001330 HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001331
Willy Tarreau87b09662015-04-03 00:22:06 +02001332 /* release other streams waiting for this server */
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001333 if (may_dequeue_tasks(srv, s->be))
Willy Tarreau827aee92011-03-10 16:55:02 +01001334 process_srv_queue(srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001335 return 1;
1336 }
1337 /* if we get here, it's because we got SRV_STATUS_OK, which also
1338 * means that the connection has not been queued.
1339 */
1340 return 0;
1341}
1342
Willy Tarreau4aac7db2014-05-16 11:48:10 +02001343/* sends a log message when a backend goes down, and also sets last
1344 * change date.
1345 */
1346void set_backend_down(struct proxy *be)
1347{
1348 be->last_change = now.tv_sec;
Christopher Fauletff8abcd2017-06-02 15:33:24 +02001349 HA_ATOMIC_ADD(&be->down_trans, 1);
Willy Tarreau4aac7db2014-05-16 11:48:10 +02001350
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01001351 if (!(global.mode & MODE_STARTING)) {
1352 Alert("%s '%s' has no server available!\n", proxy_type_str(be), be->id);
1353 send_log(be, LOG_EMERG, "%s %s has no server available!\n", proxy_type_str(be), be->id);
1354 }
Willy Tarreau4aac7db2014-05-16 11:48:10 +02001355}
1356
Willy Tarreau87b09662015-04-03 00:22:06 +02001357/* Apply RDP cookie persistence to the current stream. For this, the function
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001358 * tries to extract an RDP cookie from the request buffer, and look for the
1359 * matching server in the list. If the server is found, it is assigned to the
Willy Tarreau87b09662015-04-03 00:22:06 +02001360 * stream. This always returns 1, and the analyser removes itself from the
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001361 * list. Nothing is performed if a server was already assigned.
1362 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001363int tcp_persist_rdp_cookie(struct stream *s, struct channel *req, int an_bit)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001364{
1365 struct proxy *px = s->be;
1366 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +02001367 struct sample smp;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001368 struct server *srv = px->srv;
Willy Tarreau04276f32017-01-06 17:41:29 +01001369 uint16_t port;
1370 uint32_t addr;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001371 char *p;
1372
Willy Tarreau87b09662015-04-03 00:22:06 +02001373 DPRINTF(stderr,"[%u] %s: stream=%p b=%p, exp(r,w)=%u,%u bf=%08x bh=%d analysers=%02x\n",
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001374 now_ms, __FUNCTION__,
1375 s,
1376 req,
1377 req->rex, req->wex,
1378 req->flags,
Willy Tarreau9b28e032012-10-12 23:49:43 +02001379 req->buf->i,
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001380 req->analysers);
1381
Willy Tarreaue7dff022015-04-03 01:14:29 +02001382 if (s->flags & SF_ASSIGNED)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001383 goto no_cookie;
1384
Willy Tarreau37406352012-04-23 16:16:37 +02001385 memset(&smp, 0, sizeof(smp));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001386
Willy Tarreaucadd8c92013-07-22 18:09:52 +02001387 ret = fetch_rdp_cookie_name(s, &smp, s->be->rdp_cookie_name, s->be->rdp_cookie_len);
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001388 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || smp.data.u.str.len == 0)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001389 goto no_cookie;
1390
Willy Tarreau04276f32017-01-06 17:41:29 +01001391 /* Considering an rdp cookie detected using acl, str ended with <cr><lf> and should return.
1392 * The cookie format is <ip> "." <port> where "ip" is the integer corresponding to the
1393 * server's IP address in network order, and "port" is the integer corresponding to the
1394 * server's port in network order. Comments please Emeric.
1395 */
1396 addr = strtoul(smp.data.u.str.str, &p, 10);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001397 if (*p != '.')
1398 goto no_cookie;
1399 p++;
Willy Tarreau04276f32017-01-06 17:41:29 +01001400
1401 port = ntohs(strtoul(p, &p, 10));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001402 if (*p != '.')
1403 goto no_cookie;
1404
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001405 s->target = NULL;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001406 while (srv) {
Willy Tarreau28e9d062014-05-09 22:47:50 +02001407 if (srv->addr.ss_family == AF_INET &&
Willy Tarreau04276f32017-01-06 17:41:29 +01001408 port == srv->svc_port &&
1409 addr == ((struct sockaddr_in *)&srv->addr)->sin_addr.s_addr) {
Emeric Brun52a91d32017-08-31 14:41:55 +02001410 if ((srv->cur_state != SRV_ST_STOPPED) || (px->options & PR_O_PERSIST)) {
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001411 /* we found the server and it is usable */
Willy Tarreaue7dff022015-04-03 01:14:29 +02001412 s->flags |= SF_DIRECT | SF_ASSIGNED;
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001413 s->target = &srv->obj_type;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001414 break;
1415 }
1416 }
1417 srv = srv->next;
1418 }
1419
1420no_cookie:
1421 req->analysers &= ~an_bit;
1422 req->analyse_exp = TICK_ETERNITY;
1423 return 1;
1424}
1425
Krzysztof Oledzki85130942007-10-22 16:21:10 +02001426int be_downtime(struct proxy *px) {
Willy Tarreaub625a082007-11-26 01:15:43 +01001427 if (px->lbprm.tot_weight && px->last_change < now.tv_sec) // ignore negative time
Krzysztof Oledzki85130942007-10-22 16:21:10 +02001428 return px->down_time;
1429
1430 return now.tv_sec - px->last_change + px->down_time;
1431}
Willy Tarreaubaaee002006-06-26 02:48:02 +02001432
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01001433/*
1434 * This function returns a string containing the balancing
1435 * mode of the proxy in a format suitable for stats.
1436 */
1437
1438const char *backend_lb_algo_str(int algo) {
1439
1440 if (algo == BE_LB_ALGO_RR)
1441 return "roundrobin";
1442 else if (algo == BE_LB_ALGO_SRR)
1443 return "static-rr";
Willy Tarreauf09c6602012-02-13 17:12:08 +01001444 else if (algo == BE_LB_ALGO_FAS)
1445 return "first";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01001446 else if (algo == BE_LB_ALGO_LC)
1447 return "leastconn";
1448 else if (algo == BE_LB_ALGO_SH)
1449 return "source";
1450 else if (algo == BE_LB_ALGO_UH)
1451 return "uri";
1452 else if (algo == BE_LB_ALGO_PH)
1453 return "url_param";
1454 else if (algo == BE_LB_ALGO_HH)
1455 return "hdr";
1456 else if (algo == BE_LB_ALGO_RCH)
1457 return "rdp-cookie";
Willy Tarreaub3e111b2016-11-26 15:52:04 +01001458 else if (algo == BE_LB_ALGO_NONE)
1459 return "none";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01001460 else
Willy Tarreaub3e111b2016-11-26 15:52:04 +01001461 return "unknown";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01001462}
1463
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001464/* This function parses a "balance" statement in a backend section describing
1465 * <curproxy>. It returns -1 if there is any error, otherwise zero. If it
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001466 * returns -1, it will write an error message into the <err> buffer which will
1467 * automatically be allocated and must be passed as NULL. The trailing '\n'
1468 * will not be written. The function must be called with <args> pointing to the
1469 * first word after "balance".
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001470 */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001471int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001472{
1473 if (!*(args[0])) {
1474 /* if no option is set, use round-robin by default */
Willy Tarreau31682232007-11-29 15:38:04 +01001475 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1476 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001477 return 0;
1478 }
1479
1480 if (!strcmp(args[0], "roundrobin")) {
Willy Tarreau31682232007-11-29 15:38:04 +01001481 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1482 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001483 }
Willy Tarreau9757a382009-10-03 12:56:50 +02001484 else if (!strcmp(args[0], "static-rr")) {
1485 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1486 curproxy->lbprm.algo |= BE_LB_ALGO_SRR;
1487 }
Willy Tarreauf09c6602012-02-13 17:12:08 +01001488 else if (!strcmp(args[0], "first")) {
1489 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1490 curproxy->lbprm.algo |= BE_LB_ALGO_FAS;
1491 }
Willy Tarreau51406232008-03-10 22:04:20 +01001492 else if (!strcmp(args[0], "leastconn")) {
1493 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1494 curproxy->lbprm.algo |= BE_LB_ALGO_LC;
1495 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001496 else if (!strcmp(args[0], "source")) {
Willy Tarreau31682232007-11-29 15:38:04 +01001497 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1498 curproxy->lbprm.algo |= BE_LB_ALGO_SH;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001499 }
1500 else if (!strcmp(args[0], "uri")) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001501 int arg = 1;
1502
Willy Tarreau31682232007-11-29 15:38:04 +01001503 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1504 curproxy->lbprm.algo |= BE_LB_ALGO_UH;
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001505
Oskar Stolc8dc41842012-05-19 10:19:54 +01001506 curproxy->uri_whole = 0;
1507
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001508 while (*args[arg]) {
1509 if (!strcmp(args[arg], "len")) {
1510 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001511 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001512 return -1;
1513 }
1514 curproxy->uri_len_limit = atoi(args[arg+1]);
1515 arg += 2;
1516 }
1517 else if (!strcmp(args[arg], "depth")) {
1518 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001519 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001520 return -1;
1521 }
1522 /* hint: we store the position of the ending '/' (depth+1) so
1523 * that we avoid a comparison while computing the hash.
1524 */
1525 curproxy->uri_dirs_depth1 = atoi(args[arg+1]) + 1;
1526 arg += 2;
1527 }
Oskar Stolc8dc41842012-05-19 10:19:54 +01001528 else if (!strcmp(args[arg], "whole")) {
1529 curproxy->uri_whole = 1;
1530 arg += 1;
1531 }
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001532 else {
Oskar Stolc8dc41842012-05-19 10:19:54 +01001533 memprintf(err, "%s only accepts parameters 'len', 'depth', and 'whole' (got '%s').", args[0], args[arg]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001534 return -1;
1535 }
1536 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001537 }
Willy Tarreau01732802007-11-01 22:48:15 +01001538 else if (!strcmp(args[0], "url_param")) {
1539 if (!*args[1]) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001540 memprintf(err, "%s requires an URL parameter name.", args[0]);
Willy Tarreau01732802007-11-01 22:48:15 +01001541 return -1;
1542 }
Willy Tarreau31682232007-11-29 15:38:04 +01001543 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1544 curproxy->lbprm.algo |= BE_LB_ALGO_PH;
Willy Tarreaua534fea2008-08-03 12:19:50 +02001545
1546 free(curproxy->url_param_name);
Willy Tarreau01732802007-11-01 22:48:15 +01001547 curproxy->url_param_name = strdup(args[1]);
Willy Tarreaua534fea2008-08-03 12:19:50 +02001548 curproxy->url_param_len = strlen(args[1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001549 if (*args[2]) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02001550 if (strcmp(args[2], "check_post")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001551 memprintf(err, "%s only accepts 'check_post' modifier (got '%s').", args[0], args[2]);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02001552 return -1;
1553 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02001554 }
Benoitaffb4812009-03-25 13:02:10 +01001555 }
1556 else if (!strncmp(args[0], "hdr(", 4)) {
1557 const char *beg, *end;
1558
1559 beg = args[0] + 4;
1560 end = strchr(beg, ')');
1561
1562 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001563 memprintf(err, "hdr requires an http header field name.");
Benoitaffb4812009-03-25 13:02:10 +01001564 return -1;
1565 }
1566
1567 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1568 curproxy->lbprm.algo |= BE_LB_ALGO_HH;
1569
1570 free(curproxy->hh_name);
1571 curproxy->hh_len = end - beg;
1572 curproxy->hh_name = my_strndup(beg, end - beg);
1573 curproxy->hh_match_domain = 0;
1574
1575 if (*args[1]) {
1576 if (strcmp(args[1], "use_domain_only")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001577 memprintf(err, "%s only accepts 'use_domain_only' modifier (got '%s').", args[0], args[1]);
Benoitaffb4812009-03-25 13:02:10 +01001578 return -1;
1579 }
1580 curproxy->hh_match_domain = 1;
1581 }
Emeric Brun736aa232009-06-30 17:56:00 +02001582 }
1583 else if (!strncmp(args[0], "rdp-cookie", 10)) {
1584 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1585 curproxy->lbprm.algo |= BE_LB_ALGO_RCH;
1586
1587 if ( *(args[0] + 10 ) == '(' ) { /* cookie name */
1588 const char *beg, *end;
1589
1590 beg = args[0] + 11;
1591 end = strchr(beg, ')');
1592
1593 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001594 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02001595 return -1;
1596 }
1597
1598 free(curproxy->hh_name);
1599 curproxy->hh_name = my_strndup(beg, end - beg);
1600 curproxy->hh_len = end - beg;
1601 }
1602 else if ( *(args[0] + 10 ) == '\0' ) { /* default cookie name 'mstshash' */
1603 free(curproxy->hh_name);
1604 curproxy->hh_name = strdup("mstshash");
1605 curproxy->hh_len = strlen(curproxy->hh_name);
1606 }
1607 else { /* syntax */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001608 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02001609 return -1;
1610 }
Willy Tarreau01732802007-11-01 22:48:15 +01001611 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001612 else {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001613 memprintf(err, "only supports 'roundrobin', 'static-rr', 'leastconn', 'source', 'uri', 'url_param', 'hdr(name)' and 'rdp-cookie(name)' options.");
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001614 return -1;
1615 }
1616 return 0;
1617}
1618
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001619
1620/************************************************************************/
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001621/* All supported sample and ACL keywords must be declared here. */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001622/************************************************************************/
1623
Willy Tarreau34db1082012-04-19 17:16:54 +02001624/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001625 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001626 * undefined behaviour.
1627 */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001628static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001629smp_fetch_nbsrv(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001630{
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02001631 struct proxy *px;
1632
Willy Tarreau37406352012-04-23 16:16:37 +02001633 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001634 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02001635 px = args->data.prx;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001636
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01001637 smp->data.u.sint = be_usable_srv(px);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001638
1639 return 1;
1640}
1641
Willy Tarreau37406352012-04-23 16:16:37 +02001642/* report in smp->flags a success or failure depending on the designated
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001643 * server's state. There is no match function involved since there's no pattern.
Willy Tarreau34db1082012-04-19 17:16:54 +02001644 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1645 * undefined behaviour.
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001646 */
1647static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001648smp_fetch_srv_is_up(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001649{
Willy Tarreau24e32d82012-04-23 23:55:44 +02001650 struct server *srv = args->data.srv;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001651
Willy Tarreau37406352012-04-23 16:16:37 +02001652 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001653 smp->data.type = SMP_T_BOOL;
Emeric Brun52a91d32017-08-31 14:41:55 +02001654 if (!(srv->cur_admin & SRV_ADMF_MAINT) &&
1655 (!(srv->check.state & CHK_ST_CONFIGURED) || (srv->cur_state != SRV_ST_STOPPED)))
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001656 smp->data.u.sint = 1;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001657 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001658 smp->data.u.sint = 0;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001659 return 1;
1660}
1661
Willy Tarreau34db1082012-04-19 17:16:54 +02001662/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001663 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001664 * undefined behaviour.
1665 */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001666static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001667smp_fetch_connslots(const struct arg *args, struct sample *smp, const char *kw, void *private)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001668{
1669 struct server *iterator;
Willy Tarreaud28c3532012-04-19 19:28:33 +02001670
Willy Tarreau37406352012-04-23 16:16:37 +02001671 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001672 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001673 smp->data.u.sint = 0;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001674
Willy Tarreau24e32d82012-04-23 23:55:44 +02001675 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +02001676 if (iterator->cur_state == SRV_ST_STOPPED)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001677 continue;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001678
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001679 if (iterator->maxconn == 0 || iterator->maxqueue == 0) {
Willy Tarreaua5e37562011-12-16 17:06:15 +01001680 /* configuration is stupid */
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001681 smp->data.u.sint = -1; /* FIXME: stupid value! */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001682 return 1;
1683 }
1684
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001685 smp->data.u.sint += (iterator->maxconn - iterator->cur_sess)
Willy Tarreau422aa072012-04-20 20:49:27 +02001686 + (iterator->maxqueue - iterator->nbpend);
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001687 }
1688
1689 return 1;
1690}
1691
Willy Tarreaua5e37562011-12-16 17:06:15 +01001692/* set temp integer to the id of the backend */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001693static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001694smp_fetch_be_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02001695{
Willy Tarreaube508f12016-03-10 11:47:01 +01001696 if (!smp->strm)
1697 return 0;
1698
Willy Tarreauf853c462012-04-23 18:53:56 +02001699 smp->flags = SMP_F_VOL_TXN;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001700 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001701 smp->data.u.sint = smp->strm->be->uuid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001702 return 1;
1703}
1704
Marcin Deranekd2471c22016-12-12 14:08:05 +01001705/* set string to the name of the backend */
1706static int
1707smp_fetch_be_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
1708{
1709 if (!smp->strm)
1710 return 0;
1711
1712 smp->data.u.str.str = (char *)smp->strm->be->id;
1713 if (!smp->data.u.str.str)
1714 return 0;
1715
1716 smp->data.type = SMP_T_STR;
1717 smp->flags = SMP_F_CONST;
1718 smp->data.u.str.len = strlen(smp->data.u.str.str);
1719
1720 return 1;
1721}
1722
Willy Tarreaua5e37562011-12-16 17:06:15 +01001723/* set temp integer to the id of the server */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001724static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001725smp_fetch_srv_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02001726{
Willy Tarreaube508f12016-03-10 11:47:01 +01001727 if (!smp->strm)
1728 return 0;
1729
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02001730 if (!objt_server(smp->strm->target))
Willy Tarreau17af4192011-02-23 14:27:06 +01001731 return 0;
1732
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001733 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001734 smp->data.u.sint = objt_server(smp->strm->target)->puid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001735
1736 return 1;
1737}
1738
Willy Tarreau34db1082012-04-19 17:16:54 +02001739/* set temp integer to the number of connections per second reaching the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001740 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001741 * undefined behaviour.
1742 */
Willy Tarreau079ff0a2009-03-05 21:34:28 +01001743static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001744smp_fetch_be_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau079ff0a2009-03-05 21:34:28 +01001745{
Willy Tarreau37406352012-04-23 16:16:37 +02001746 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001747 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001748 smp->data.u.sint = read_freq_ctr(&args->data.prx->be_sess_per_sec);
Willy Tarreau079ff0a2009-03-05 21:34:28 +01001749 return 1;
1750}
1751
Willy Tarreau34db1082012-04-19 17:16:54 +02001752/* set temp integer to the number of concurrent connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001753 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001754 * undefined behaviour.
1755 */
Willy Tarreaua36af912009-10-10 12:02:45 +02001756static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001757smp_fetch_be_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02001758{
Willy Tarreau37406352012-04-23 16:16:37 +02001759 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001760 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001761 smp->data.u.sint = args->data.prx->beconn;
Willy Tarreaua36af912009-10-10 12:02:45 +02001762 return 1;
1763}
1764
Willy Tarreau34db1082012-04-19 17:16:54 +02001765/* set temp integer to the total number of queued connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001766 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001767 * undefined behaviour.
1768 */
Willy Tarreaua36af912009-10-10 12:02:45 +02001769static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001770smp_fetch_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02001771{
Willy Tarreau37406352012-04-23 16:16:37 +02001772 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001773 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001774 smp->data.u.sint = args->data.prx->totpend;
Willy Tarreaua36af912009-10-10 12:02:45 +02001775 return 1;
1776}
1777
Willy Tarreaua5e37562011-12-16 17:06:15 +01001778/* set temp integer to the total number of queued connections on the backend divided
Willy Tarreaua36af912009-10-10 12:02:45 +02001779 * by the number of running servers and rounded up. If there is no running
1780 * server, we return twice the total, just as if we had half a running server.
1781 * This is more or less correct anyway, since we expect the last server to come
1782 * back soon.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001783 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001784 * undefined behaviour.
Willy Tarreaua36af912009-10-10 12:02:45 +02001785 */
1786static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001787smp_fetch_avg_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02001788{
1789 int nbsrv;
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02001790 struct proxy *px;
Willy Tarreaua36af912009-10-10 12:02:45 +02001791
Willy Tarreau37406352012-04-23 16:16:37 +02001792 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001793 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02001794 px = args->data.prx;
Willy Tarreaua36af912009-10-10 12:02:45 +02001795
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01001796 nbsrv = be_usable_srv(px);
Willy Tarreaua36af912009-10-10 12:02:45 +02001797
1798 if (nbsrv > 0)
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001799 smp->data.u.sint = (px->totpend + nbsrv - 1) / nbsrv;
Willy Tarreaua36af912009-10-10 12:02:45 +02001800 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001801 smp->data.u.sint = px->totpend * 2;
Willy Tarreaua36af912009-10-10 12:02:45 +02001802
1803 return 1;
1804}
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001805
Willy Tarreau34db1082012-04-19 17:16:54 +02001806/* set temp integer to the number of concurrent connections on the server in the backend.
1807 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1808 * undefined behaviour.
1809 */
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02001810static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001811smp_fetch_srv_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02001812{
Willy Tarreauf853c462012-04-23 18:53:56 +02001813 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001814 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001815 smp->data.u.sint = args->data.srv->cur_sess;
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02001816 return 1;
1817}
1818
Willy Tarreauff2b7af2017-10-13 11:46:26 +02001819/* set temp integer to the number of connections pending in the server's queue.
1820 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1821 * undefined behaviour.
1822 */
1823static int
1824smp_fetch_srv_queue(const struct arg *args, struct sample *smp, const char *kw, void *private)
1825{
1826 smp->flags = SMP_F_VOL_TEST;
1827 smp->data.type = SMP_T_SINT;
1828 smp->data.u.sint = args->data.srv->nbpend;
1829 return 1;
1830}
1831
Tait Clarridge7896d522012-12-05 21:39:31 -05001832/* set temp integer to the number of enabled servers on the proxy.
1833 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1834 * undefined behaviour.
1835 */
1836static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001837smp_fetch_srv_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Tait Clarridge7896d522012-12-05 21:39:31 -05001838{
1839 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001840 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001841 smp->data.u.sint = read_freq_ctr(&args->data.srv->sess_per_sec);
Tait Clarridge7896d522012-12-05 21:39:31 -05001842 return 1;
1843}
1844
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01001845static int sample_conv_nbsrv(const struct arg *args, struct sample *smp, void *private)
1846{
1847
1848 struct proxy *px;
1849
1850 if (!smp_make_safe(smp))
1851 return 0;
1852
1853 px = proxy_find_by_name(smp->data.u.str.str, PR_CAP_BE, 0);
1854 if (!px)
1855 return 0;
1856
1857 smp->data.type = SMP_T_SINT;
1858 smp->data.u.sint = be_usable_srv(px);
1859
1860 return 1;
1861}
1862
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001863
1864/* Note: must not be declared <const> as its list will be overwritten.
1865 * Please take care of keeping this list alphabetically sorted.
1866 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02001867static struct sample_fetch_kw_list smp_kws = {ILH, {
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02001868 { "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1869 { "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1870 { "be_id", smp_fetch_be_id, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
Marcin Deranekd2471c22016-12-12 14:08:05 +01001871 { "be_name", smp_fetch_be_name, 0, NULL, SMP_T_STR, SMP_USE_BKEND, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02001872 { "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1873 { "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1874 { "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1875 { "queue", smp_fetch_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1876 { "srv_conn", smp_fetch_srv_conn, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1877 { "srv_id", smp_fetch_srv_id, 0, NULL, SMP_T_SINT, SMP_USE_SERVR, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001878 { "srv_is_up", smp_fetch_srv_is_up, ARG1(1,SRV), NULL, SMP_T_BOOL, SMP_USE_INTRN, },
Willy Tarreauff2b7af2017-10-13 11:46:26 +02001879 { "srv_queue", smp_fetch_srv_queue, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02001880 { "srv_sess_rate", smp_fetch_srv_sess_rate, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001881 { /* END */ },
1882}};
1883
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01001884/* Note: must not be declared <const> as its list will be overwritten */
1885static struct sample_conv_kw_list sample_conv_kws = {ILH, {
1886 { "nbsrv", sample_conv_nbsrv, 0, NULL, SMP_T_STR, SMP_T_SINT },
1887 { /* END */ },
1888}};
1889
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001890
Willy Tarreau61612d42012-04-19 18:42:05 +02001891/* Note: must not be declared <const> as its list will be overwritten.
1892 * Please take care of keeping this list alphabetically sorted.
1893 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02001894static struct acl_kw_list acl_kws = {ILH, {
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001895 { /* END */ },
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001896}};
1897
1898
1899__attribute__((constructor))
1900static void __backend_init(void)
1901{
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001902 sample_register_fetches(&smp_kws);
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01001903 sample_register_convs(&sample_conv_kws);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001904 acl_register_keywords(&acl_kws);
1905}
1906
Willy Tarreaubaaee002006-06-26 02:48:02 +02001907/*
1908 * Local variables:
1909 * c-indent-level: 8
1910 * c-basic-offset: 8
1911 * End:
1912 */