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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 Tarreau188e2302018-06-15 11:11:53 +0200325 const char *params = c_ptr(req, -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 Tarreauc9fa0482018-07-10 17:43:27 +0200332 if (len > b_wrap(&req->buf) - p)
333 len = b_wrap(&req->buf) - p;
Willy Tarreauf69d4ff2015-05-02 00:05:47 +0200334
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 Tarreau188e2302018-06-15 11:11:53 +0200415 http_find_header2(px->hh_name, plen, c_ptr(&s->req, -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 Tarreau6a445eb2018-06-19 07:04:45 +0200488 rewind = co_data(&s->req);
489 c_rew(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200490
Willy Tarreaucadd8c92013-07-22 18:09:52 +0200491 ret = fetch_rdp_cookie_name(s, &smp, px->hh_name, px->hh_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200492 len = smp.data.u.str.data;
Willy Tarreau664092c2011-12-16 19:11:42 +0100493
Willy Tarreaubcbd3932018-06-06 07:13:22 +0200494 c_adv(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200495
Willy Tarreau37406352012-04-23 16:16:37 +0200496 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || len == 0)
Emeric Brun736aa232009-06-30 17:56:00 +0200497 return NULL;
498
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200499 /* note: we won't hash if there's only one server left */
500 if (px->lbprm.tot_used == 1)
501 goto hash_done;
502
Emeric Brun736aa232009-06-30 17:56:00 +0200503 /* Found a the hh_name in the headers.
504 * we will compute the hash based on this value ctx.val.
505 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200506 hash = gen_hash(px, smp.data.u.str.area, len);
Bhaskar98634f02013-10-29 23:30:51 -0400507
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500508 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100509 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200510 hash_done:
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200511 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
512 return chash_get_server_hash(px, hash);
513 else
514 return map_get_server_hash(px, hash);
Emeric Brun736aa232009-06-30 17:56:00 +0200515}
Christopher Faulet5b517552017-06-09 14:17:53 +0200516
Willy Tarreau760e81d2018-05-03 07:20:40 +0200517/* random value */
518static struct server *get_server_rnd(struct stream *s)
519{
520 unsigned int hash = 0;
521 struct proxy *px = s->be;
522
523 /* tot_weight appears to mean srv_count */
524 if (px->lbprm.tot_weight == 0)
525 return NULL;
526
527 /* ensure all 32 bits are covered as long as RAND_MAX >= 65535 */
528 hash = ((uint64_t)random() * ((uint64_t)RAND_MAX + 1)) ^ random();
529 return chash_get_server_hash(px, hash);
530}
531
Benoitaffb4812009-03-25 13:02:10 +0100532/*
Willy Tarreau87b09662015-04-03 00:22:06 +0200533 * This function applies the load-balancing algorithm to the stream, as
534 * defined by the backend it is assigned to. The stream is then marked as
Willy Tarreau7c669d72008-06-20 15:04:11 +0200535 * 'assigned'.
536 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200537 * This function MAY NOT be called with SF_ASSIGNED already set. If the stream
Willy Tarreau7c669d72008-06-20 15:04:11 +0200538 * had a server previously assigned, it is rebalanced, trying to avoid the same
Willy Tarreau827aee92011-03-10 16:55:02 +0100539 * server, which should still be present in target_srv(&s->target) before the call.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200540 * The function tries to keep the original connection slot if it reconnects to
541 * the same server, otherwise it releases it and tries to offer it.
542 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200543 * It is illegal to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200544 *
545 * It may return :
Willy Tarreau664beb82011-03-10 11:38:29 +0100546 * SRV_STATUS_OK if everything is OK. ->srv and ->target are assigned.
Willy Tarreau87b09662015-04-03 00:22:06 +0200547 * SRV_STATUS_NOSRV if no server is available. Stream is not ASSIGNED
548 * SRV_STATUS_FULL if all servers are saturated. Stream is not ASSIGNED
Willy Tarreaubaaee002006-06-26 02:48:02 +0200549 * SRV_STATUS_INTERNAL for other unrecoverable errors.
550 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200551 * Upon successful return, the stream flag SF_ASSIGNED is set to indicate that
Willy Tarreau827aee92011-03-10 16:55:02 +0100552 * it does not need to be called anymore. This means that target_srv(&s->target)
553 * can be trusted in balance and direct modes.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200554 *
555 */
556
Willy Tarreau87b09662015-04-03 00:22:06 +0200557int assign_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200558{
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200559 struct connection *conn;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200560 struct server *conn_slot;
Willy Tarreau827aee92011-03-10 16:55:02 +0100561 struct server *srv, *prev_srv;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200562 int err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100563
Simon Horman8effd3d2011-08-13 08:03:52 +0900564 DPRINTF(stderr,"assign_server : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200565
Willy Tarreau7c669d72008-06-20 15:04:11 +0200566 err = SRV_STATUS_INTERNAL;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200567 if (unlikely(s->pend_pos || s->flags & SF_ASSIGNED))
Willy Tarreau7c669d72008-06-20 15:04:11 +0200568 goto out_err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100569
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100570 prev_srv = objt_server(s->target);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200571 conn_slot = s->srv_conn;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200572
Willy Tarreau7c669d72008-06-20 15:04:11 +0200573 /* We have to release any connection slot before applying any LB algo,
574 * otherwise we may erroneously end up with no available slot.
575 */
576 if (conn_slot)
577 sess_change_server(s, NULL);
578
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100579 /* We will now try to find the good server and store it into <objt_server(s->target)>.
580 * Note that <objt_server(s->target)> may be NULL in case of dispatch or proxy mode,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200581 * as well as if no server is available (check error code).
582 */
Willy Tarreau1a20a5d2007-11-01 21:08:19 +0100583
Willy Tarreau827aee92011-03-10 16:55:02 +0100584 srv = NULL;
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100585 s->target = NULL;
Olivier Houchard9aaf7782017-09-13 18:30:23 +0200586 conn = cs_conn(objt_cs(s->si[1].end));
Willy Tarreau664beb82011-03-10 11:38:29 +0100587
Willy Tarreau068621e2013-12-23 15:11:25 +0100588 if (conn &&
Willy Tarreau2481d162014-02-19 18:40:43 +0100589 (conn->flags & CO_FL_CONNECTED) &&
Willy Tarreau9420b122013-12-15 18:58:25 +0100590 objt_server(conn->target) && __objt_server(conn->target)->proxy == s->be &&
Willy Tarreaueee5b512015-04-03 23:46:31 +0200591 ((s->txn && s->txn->flags & TX_PREFER_LAST) ||
Willy Tarreauc35362a2014-04-25 13:58:37 +0200592 ((s->be->options & PR_O_PREF_LAST) &&
Olivier Doucet1ca1b6f2017-01-02 11:48:57 +0100593 (s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI &&
Willy Tarreauc35362a2014-04-25 13:58:37 +0200594 (!s->be->max_ka_queue ||
595 server_has_room(__objt_server(conn->target)) ||
596 (__objt_server(conn->target)->nbpend + 1) < s->be->max_ka_queue))) &&
Emeric Brun52a91d32017-08-31 14:41:55 +0200597 srv_currently_usable(__objt_server(conn->target))) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200598 /* This stream was relying on a server in a previous request
Olivier Doucet1ca1b6f2017-01-02 11:48:57 +0100599 * and the proxy has "option prefer-last-server" set
600 * and balance algorithm dont tell us to do otherwise, so
Willy Tarreau9420b122013-12-15 18:58:25 +0100601 * let's try to reuse the same server.
602 */
603 srv = __objt_server(conn->target);
604 s->target = &srv->obj_type;
605 }
606 else if (s->be->lbprm.algo & BE_LB_KIND) {
Christopher Faulet5b517552017-06-09 14:17:53 +0200607
Willy Tarreau7c669d72008-06-20 15:04:11 +0200608 /* we must check if we have at least one server available */
609 if (!s->be->lbprm.tot_weight) {
610 err = SRV_STATUS_NOSRV;
611 goto out;
612 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200613
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200614 /* First check whether we need to fetch some data or simply call
615 * the LB lookup function. Only the hashing functions will need
616 * some input data in fact, and will support multiple algorithms.
617 */
618 switch (s->be->lbprm.algo & BE_LB_LKUP) {
619 case BE_LB_LKUP_RRTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100620 srv = fwrr_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200621 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200622
Willy Tarreauf09c6602012-02-13 17:12:08 +0100623 case BE_LB_LKUP_FSTREE:
624 srv = fas_get_next_server(s->be, prev_srv);
625 break;
626
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200627 case BE_LB_LKUP_LCTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100628 srv = fwlc_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200629 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200630
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200631 case BE_LB_LKUP_CHTREE:
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200632 case BE_LB_LKUP_MAP:
Willy Tarreau9757a382009-10-03 12:56:50 +0200633 if ((s->be->lbprm.algo & BE_LB_KIND) == BE_LB_KIND_RR) {
Willy Tarreau760e81d2018-05-03 07:20:40 +0200634 if ((s->be->lbprm.algo & BE_LB_PARM) == BE_LB_RR_RANDOM)
635 srv = get_server_rnd(s);
636 else if (s->be->lbprm.algo & BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100637 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200638 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100639 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau9757a382009-10-03 12:56:50 +0200640 break;
641 }
642 else if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200643 /* unknown balancing algorithm */
Willy Tarreau7c669d72008-06-20 15:04:11 +0200644 err = SRV_STATUS_INTERNAL;
645 goto out;
646 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200647
648 switch (s->be->lbprm.algo & BE_LB_PARM) {
649 case BE_LB_HASH_SRC:
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200650 conn = objt_conn(strm_orig(s));
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200651 if (conn && conn->addr.from.ss_family == AF_INET) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200652 srv = get_server_sh(s->be,
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200653 (void *)&((struct sockaddr_in *)&conn->addr.from)->sin_addr,
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200654 4);
655 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200656 else if (conn && conn->addr.from.ss_family == AF_INET6) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200657 srv = get_server_sh(s->be,
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200658 (void *)&((struct sockaddr_in6 *)&conn->addr.from)->sin6_addr,
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200659 16);
660 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200661 else {
662 /* unknown IP family */
663 err = SRV_STATUS_INTERNAL;
664 goto out;
665 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200666 break;
667
668 case BE_LB_HASH_URI:
669 /* URI hashing */
Willy Tarreaueee5b512015-04-03 23:46:31 +0200670 if (!s->txn || s->txn->req.msg_state < HTTP_MSG_BODY)
Willy Tarreaueaed5a12010-03-24 14:54:30 +0100671 break;
Willy Tarreau827aee92011-03-10 16:55:02 +0100672 srv = get_server_uh(s->be,
Willy Tarreau188e2302018-06-15 11:11:53 +0200673 c_ptr(&s->req, -http_uri_rewind(&s->txn->req)),
Willy Tarreaueee5b512015-04-03 23:46:31 +0200674 s->txn->req.sl.rq.u_l);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200675 break;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200676
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200677 case BE_LB_HASH_PRM:
678 /* URL Parameter hashing */
Willy Tarreaueee5b512015-04-03 23:46:31 +0200679 if (!s->txn || s->txn->req.msg_state < HTTP_MSG_BODY)
Willy Tarreaueaed5a12010-03-24 14:54:30 +0100680 break;
Willy Tarreau61a21a32011-03-01 20:35:49 +0100681
Willy Tarreau827aee92011-03-10 16:55:02 +0100682 srv = get_server_ph(s->be,
Willy Tarreau188e2302018-06-15 11:11:53 +0200683 c_ptr(&s->req, -http_uri_rewind(&s->txn->req)),
Willy Tarreaueee5b512015-04-03 23:46:31 +0200684 s->txn->req.sl.rq.u_l);
Willy Tarreau61a21a32011-03-01 20:35:49 +0100685
Willy Tarreaueee5b512015-04-03 23:46:31 +0200686 if (!srv && s->txn->meth == HTTP_METH_POST)
Willy Tarreau827aee92011-03-10 16:55:02 +0100687 srv = get_server_ph_post(s);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200688 break;
Benoitaffb4812009-03-25 13:02:10 +0100689
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200690 case BE_LB_HASH_HDR:
691 /* Header Parameter hashing */
Willy Tarreaueee5b512015-04-03 23:46:31 +0200692 if (!s->txn || s->txn->req.msg_state < HTTP_MSG_BODY)
Willy Tarreaueaed5a12010-03-24 14:54:30 +0100693 break;
Willy Tarreau827aee92011-03-10 16:55:02 +0100694 srv = get_server_hh(s);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200695 break;
696
697 case BE_LB_HASH_RDP:
698 /* RDP Cookie hashing */
Willy Tarreau827aee92011-03-10 16:55:02 +0100699 srv = get_server_rch(s);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200700 break;
701
702 default:
703 /* unknown balancing algorithm */
704 err = SRV_STATUS_INTERNAL;
705 goto out;
Benoitaffb4812009-03-25 13:02:10 +0100706 }
Emeric Brun736aa232009-06-30 17:56:00 +0200707
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200708 /* If the hashing parameter was not found, let's fall
709 * back to round robin on the map.
710 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100711 if (!srv) {
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200712 if (s->be->lbprm.algo & BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100713 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200714 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100715 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200716 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200717
718 /* end of map-based LB */
Emeric Brun736aa232009-06-30 17:56:00 +0200719 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200720
Willy Tarreau7c669d72008-06-20 15:04:11 +0200721 default:
722 /* unknown balancing algorithm */
723 err = SRV_STATUS_INTERNAL;
724 goto out;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200725 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200726
Willy Tarreau827aee92011-03-10 16:55:02 +0100727 if (!srv) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200728 err = SRV_STATUS_FULL;
729 goto out;
730 }
Willy Tarreau827aee92011-03-10 16:55:02 +0100731 else if (srv != prev_srv) {
Christopher Fauletff8abcd2017-06-02 15:33:24 +0200732 HA_ATOMIC_ADD(&s->be->be_counters.cum_lbconn, 1);
Christopher Faulet29f77e82017-06-08 14:04:45 +0200733 HA_ATOMIC_ADD(&srv->counters.cum_lbconn, 1);
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100734 }
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100735 s->target = &srv->obj_type;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200736 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200737 else if (s->be->options & (PR_O_DISPATCH | PR_O_TRANSP)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100738 s->target = &s->be->obj_type;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200739 }
David du Colombier6f5ccb12011-03-10 22:26:24 +0100740 else if ((s->be->options & PR_O_HTTP_PROXY) &&
Olivier Houchard9aaf7782017-09-13 18:30:23 +0200741 conn && is_addr(&conn->addr.to)) {
Willy Tarreau664beb82011-03-10 11:38:29 +0100742 /* in proxy mode, we need a valid destination address */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100743 s->target = &s->be->obj_type;
Willy Tarreau664beb82011-03-10 11:38:29 +0100744 }
745 else {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200746 err = SRV_STATUS_NOSRV;
747 goto out;
748 }
749
Willy Tarreaue7dff022015-04-03 01:14:29 +0200750 s->flags |= SF_ASSIGNED;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200751 err = SRV_STATUS_OK;
752 out:
753
754 /* Either we take back our connection slot, or we offer it to someone
755 * else if we don't need it anymore.
756 */
757 if (conn_slot) {
Willy Tarreau827aee92011-03-10 16:55:02 +0100758 if (conn_slot == srv) {
759 sess_change_server(s, srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200760 } else {
761 if (may_dequeue_tasks(conn_slot, s->be))
762 process_srv_queue(conn_slot);
763 }
764 }
765
766 out_err:
767 return err;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200768}
769
Willy Tarreaubaaee002006-06-26 02:48:02 +0200770/*
Willy Tarreaue7dff022015-04-03 01:14:29 +0200771 * This function assigns a server address to a stream, and sets SF_ADDR_SET.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200772 * The address is taken from the currently assigned server, or from the
773 * dispatch or transparent address.
774 *
775 * It may return :
776 * SRV_STATUS_OK if everything is OK.
777 * SRV_STATUS_INTERNAL for other unrecoverable errors.
778 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200779 * Upon successful return, the stream flag SF_ADDR_SET is set. This flag is
Willy Tarreaubaaee002006-06-26 02:48:02 +0200780 * not cleared, so it's to the caller to clear it if required.
781 *
Willy Tarreau32e3c6a2013-10-11 19:34:20 +0200782 * The caller is responsible for having already assigned a connection
783 * to si->end.
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200784 *
Willy Tarreaubaaee002006-06-26 02:48:02 +0200785 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200786int assign_server_address(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200787{
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200788 struct connection *cli_conn = objt_conn(strm_orig(s));
Olivier Houchard9aaf7782017-09-13 18:30:23 +0200789 struct connection *srv_conn = cs_conn(objt_cs(s->si[1].end));
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200790
Christopher Faulet56803b12017-11-24 16:06:18 +0100791 DPRINTF(stderr,"assign_server_address : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200792
Willy Tarreaue7dff022015-04-03 01:14:29 +0200793 if ((s->flags & SF_DIRECT) || (s->be->lbprm.algo & BE_LB_KIND)) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200794 /* A server is necessarily known for this stream */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200795 if (!(s->flags & SF_ASSIGNED))
Willy Tarreaubaaee002006-06-26 02:48:02 +0200796 return SRV_STATUS_INTERNAL;
797
Willy Tarreau1e582e52018-09-20 11:29:28 +0200798 srv_conn->addr.to = __objt_server(s->target)->addr;
799 set_host_port(&srv_conn->addr.to, __objt_server(s->target)->svc_port);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200800
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200801 if (!is_addr(&srv_conn->addr.to) && cli_conn) {
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200802 /* if the server has no address, we use the same address
803 * the client asked, which is handy for remapping ports
Willy Tarreau9cf8d3f2014-05-09 22:56:10 +0200804 * locally on multiple addresses at once. Nothing is done
805 * for AF_UNIX addresses.
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200806 */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200807 conn_get_to_addr(cli_conn);
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200808
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200809 if (cli_conn->addr.to.ss_family == AF_INET) {
810 ((struct sockaddr_in *)&srv_conn->addr.to)->sin_addr = ((struct sockaddr_in *)&cli_conn->addr.to)->sin_addr;
811 } else if (cli_conn->addr.to.ss_family == AF_INET6) {
812 ((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 +0200813 }
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200814 }
815
Willy Tarreaubaaee002006-06-26 02:48:02 +0200816 /* if this server remaps proxied ports, we'll use
817 * the port the client connected to with an offset. */
Willy Tarreau1e582e52018-09-20 11:29:28 +0200818 if ((__objt_server(s->target)->flags & SRV_F_MAPPORTS) && cli_conn) {
David du Colombier6f5ccb12011-03-10 22:26:24 +0100819 int base_port;
820
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200821 conn_get_to_addr(cli_conn);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100822
823 /* First, retrieve the port from the incoming connection */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200824 base_port = get_host_port(&cli_conn->addr.to);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100825
826 /* Second, assign the outgoing connection's port */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200827 base_port += get_host_port(&srv_conn->addr.to);
828 set_host_port(&srv_conn->addr.to, base_port);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200829 }
830 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200831 else if (s->be->options & PR_O_DISPATCH) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200832 /* connect to the defined dispatch addr */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200833 srv_conn->addr.to = s->be->dispatch_addr;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200834 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200835 else if ((s->be->options & PR_O_TRANSP) && cli_conn) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200836 /* in transparent mode, use the original dest addr if no dispatch specified */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200837 conn_get_to_addr(cli_conn);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200838
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200839 if (cli_conn->addr.to.ss_family == AF_INET || cli_conn->addr.to.ss_family == AF_INET6)
840 srv_conn->addr.to = cli_conn->addr.to;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200841 }
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100842 else if (s->be->options & PR_O_HTTP_PROXY) {
843 /* If HTTP PROXY option is set, then server is already assigned
844 * during incoming client request parsing. */
845 }
Willy Tarreau1a1158b2007-01-20 11:07:46 +0100846 else {
847 /* no server and no LB algorithm ! */
848 return SRV_STATUS_INTERNAL;
849 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200850
KOVACS Krisztianb3e54fe2014-11-17 15:11:45 +0100851 /* Copy network namespace from client connection */
Thierry FOURNIERfe1ebcd2014-12-19 13:37:11 +0100852 srv_conn->proxy_netns = cli_conn ? cli_conn->proxy_netns : NULL;
KOVACS Krisztianb3e54fe2014-11-17 15:11:45 +0100853
Willy Tarreaue7dff022015-04-03 01:14:29 +0200854 s->flags |= SF_ADDR_SET;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200855 return SRV_STATUS_OK;
856}
857
Willy Tarreau87b09662015-04-03 00:22:06 +0200858/* This function assigns a server to stream <s> if required, and can add the
Willy Tarreaubaaee002006-06-26 02:48:02 +0200859 * connection to either the assigned server's queue or to the proxy's queue.
Willy Tarreau87b09662015-04-03 00:22:06 +0200860 * If ->srv_conn is set, the stream is first released from the server.
Willy Tarreaue7dff022015-04-03 01:14:29 +0200861 * It may also be called with SF_DIRECT and/or SF_ASSIGNED though. It will
Willy Tarreau7c669d72008-06-20 15:04:11 +0200862 * be called before any connection and after any retry or redispatch occurs.
863 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200864 * It is not allowed to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200865 *
866 * Returns :
867 *
868 * SRV_STATUS_OK if everything is OK.
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100869 * SRV_STATUS_NOSRV if no server is available. objt_server(s->target) = NULL.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200870 * SRV_STATUS_QUEUED if the connection has been queued.
871 * SRV_STATUS_FULL if the server(s) is/are saturated and the
Willy Tarreau827aee92011-03-10 16:55:02 +0100872 * connection could not be queued at the server's,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200873 * which may be NULL if we queue on the backend.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200874 * SRV_STATUS_INTERNAL for other unrecoverable errors.
875 *
876 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200877int assign_server_and_queue(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200878{
879 struct pendconn *p;
Willy Tarreau827aee92011-03-10 16:55:02 +0100880 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200881 int err;
882
883 if (s->pend_pos)
884 return SRV_STATUS_INTERNAL;
885
Willy Tarreau7c669d72008-06-20 15:04:11 +0200886 err = SRV_STATUS_OK;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200887 if (!(s->flags & SF_ASSIGNED)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100888 struct server *prev_srv = objt_server(s->target);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100889
Willy Tarreau7c669d72008-06-20 15:04:11 +0200890 err = assign_server(s);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100891 if (prev_srv) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200892 /* This stream was previously assigned to a server. We have to
893 * update the stream's and the server's stats :
Willy Tarreau7c669d72008-06-20 15:04:11 +0200894 * - if the server changed :
895 * - set TX_CK_DOWN if txn.flags was TX_CK_VALID
Willy Tarreaue7dff022015-04-03 01:14:29 +0200896 * - set SF_REDISP if it was successfully redispatched
Willy Tarreau7c669d72008-06-20 15:04:11 +0200897 * - increment srv->redispatches and be->redispatches
898 * - if the server remained the same : update retries.
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100899 */
900
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100901 if (prev_srv != objt_server(s->target)) {
Willy Tarreaueee5b512015-04-03 23:46:31 +0200902 if (s->txn && (s->txn->flags & TX_CK_MASK) == TX_CK_VALID) {
903 s->txn->flags &= ~TX_CK_MASK;
904 s->txn->flags |= TX_CK_DOWN;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200905 }
Willy Tarreaue7dff022015-04-03 01:14:29 +0200906 s->flags |= SF_REDISP;
Christopher Faulet29f77e82017-06-08 14:04:45 +0200907 HA_ATOMIC_ADD(&prev_srv->counters.redispatches, 1);
Christopher Fauletff8abcd2017-06-02 15:33:24 +0200908 HA_ATOMIC_ADD(&s->be->be_counters.redispatches, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200909 } else {
Christopher Faulet29f77e82017-06-08 14:04:45 +0200910 HA_ATOMIC_ADD(&prev_srv->counters.retries, 1);
Christopher Fauletff8abcd2017-06-02 15:33:24 +0200911 HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100912 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100913 }
914 }
915
Willy Tarreaubaaee002006-06-26 02:48:02 +0200916 switch (err) {
917 case SRV_STATUS_OK:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200918 /* we have SF_ASSIGNED set */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100919 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +0100920 if (!srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200921 return SRV_STATUS_OK; /* dispatch or proxy mode */
922
923 /* If we already have a connection slot, no need to check any queue */
Willy Tarreau827aee92011-03-10 16:55:02 +0100924 if (s->srv_conn == srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200925 return SRV_STATUS_OK;
926
Willy Tarreau87b09662015-04-03 00:22:06 +0200927 /* OK, this stream already has an assigned server, but no
Willy Tarreau7c669d72008-06-20 15:04:11 +0200928 * connection slot yet. Either it is a redispatch, or it was
929 * assigned from persistence information (direct mode).
930 */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200931 if ((s->flags & SF_REDIRECTABLE) && srv->rdr_len) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200932 /* server scheduled for redirection, and already assigned. We
933 * don't want to go further nor check the queue.
Willy Tarreau21d2af32008-02-14 20:25:24 +0100934 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100935 sess_change_server(s, srv); /* not really needed in fact */
Willy Tarreau21d2af32008-02-14 20:25:24 +0100936 return SRV_STATUS_OK;
937 }
938
Willy Tarreau87b09662015-04-03 00:22:06 +0200939 /* We might have to queue this stream if the assigned server is full.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200940 * We know we have to queue it into the server's queue, so if a maxqueue
941 * is set on the server, we must also check that the server's queue is
942 * not full, in which case we have to return FULL.
943 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100944 if (srv->maxconn &&
945 (srv->nbpend || srv->served >= srv_dynamic_maxconn(srv))) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200946
Willy Tarreau827aee92011-03-10 16:55:02 +0100947 if (srv->maxqueue > 0 && srv->nbpend >= srv->maxqueue)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200948 return SRV_STATUS_FULL;
949
Willy Tarreaubaaee002006-06-26 02:48:02 +0200950 p = pendconn_add(s);
951 if (p)
952 return SRV_STATUS_QUEUED;
953 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200954 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200955 }
Willy Tarreau7c669d72008-06-20 15:04:11 +0200956
957 /* OK, we can use this server. Let's reserve our place */
Willy Tarreau827aee92011-03-10 16:55:02 +0100958 sess_change_server(s, srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200959 return SRV_STATUS_OK;
960
961 case SRV_STATUS_FULL:
Willy Tarreau87b09662015-04-03 00:22:06 +0200962 /* queue this stream into the proxy's queue */
Willy Tarreaubaaee002006-06-26 02:48:02 +0200963 p = pendconn_add(s);
964 if (p)
965 return SRV_STATUS_QUEUED;
966 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200967 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200968
969 case SRV_STATUS_NOSRV:
Willy Tarreau7c669d72008-06-20 15:04:11 +0200970 return err;
971
Willy Tarreaubaaee002006-06-26 02:48:02 +0200972 case SRV_STATUS_INTERNAL:
973 return err;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200974
Willy Tarreaubaaee002006-06-26 02:48:02 +0200975 default:
976 return SRV_STATUS_INTERNAL;
977 }
Willy Tarreau5b6995c2008-01-13 16:31:17 +0100978}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200979
Willy Tarreaub1d67742010-03-29 19:36:59 +0200980/* If an explicit source binding is specified on the server and/or backend, and
981 * this source makes use of the transparent proxy, then it is extracted now and
Willy Tarreau87b09662015-04-03 00:22:06 +0200982 * assigned to the stream's pending connection. This function assumes that an
Willy Tarreau350f4872014-11-28 14:42:25 +0100983 * outgoing connection has already been assigned to s->si[1].end.
Willy Tarreaub1d67742010-03-29 19:36:59 +0200984 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200985static void assign_tproxy_address(struct stream *s)
Willy Tarreaub1d67742010-03-29 19:36:59 +0200986{
Willy Tarreau29fbe512015-08-20 19:35:14 +0200987#if defined(CONFIG_HAP_TRANSPARENT)
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100988 struct server *srv = objt_server(s->target);
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100989 struct conn_src *src;
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200990 struct connection *cli_conn;
Olivier Houchard9aaf7782017-09-13 18:30:23 +0200991 struct connection *srv_conn = cs_conn(objt_cs(s->si[1].end));
Willy Tarreau827aee92011-03-10 16:55:02 +0100992
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100993 if (srv && srv->conn_src.opts & CO_SRC_BIND)
994 src = &srv->conn_src;
995 else if (s->be->conn_src.opts & CO_SRC_BIND)
996 src = &s->be->conn_src;
997 else
998 return;
Willy Tarreau294c4732011-12-16 21:35:50 +0100999
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001000 switch (src->opts & CO_SRC_TPROXY_MASK) {
1001 case CO_SRC_TPROXY_ADDR:
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001002 srv_conn->addr.from = src->tproxy_addr;
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001003 break;
1004 case CO_SRC_TPROXY_CLI:
1005 case CO_SRC_TPROXY_CIP:
1006 /* FIXME: what can we do if the client connects in IPv6 or unix socket ? */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001007 cli_conn = objt_conn(strm_orig(s));
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001008 if (cli_conn)
1009 srv_conn->addr.from = cli_conn->addr.from;
1010 else
1011 memset(&srv_conn->addr.from, 0, sizeof(srv_conn->addr.from));
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001012 break;
1013 case CO_SRC_TPROXY_DYN:
Willy Tarreaueee5b512015-04-03 23:46:31 +02001014 if (src->bind_hdr_occ && s->txn) {
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001015 char *vptr;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001016 size_t vlen;
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001017 int rewind;
Willy Tarreau294c4732011-12-16 21:35:50 +01001018
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001019 /* bind to the IP in a header */
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001020 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_family = AF_INET;
1021 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_port = 0;
1022 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_addr.s_addr = 0;
Willy Tarreau294c4732011-12-16 21:35:50 +01001023
Willy Tarreaubcbd3932018-06-06 07:13:22 +02001024 c_rew(&s->req, rewind = http_hdr_rewind(&s->txn->req));
Willy Tarreaueee5b512015-04-03 23:46:31 +02001025 if (http_get_hdr(&s->txn->req, src->bind_hdr_name, src->bind_hdr_len,
1026 &s->txn->hdr_idx, src->bind_hdr_occ, NULL, &vptr, &vlen)) {
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001027 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_addr.s_addr =
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001028 htonl(inetaddr_host_lim(vptr, vptr + vlen));
Willy Tarreaubce70882009-09-07 11:51:47 +02001029 }
Willy Tarreaubcbd3932018-06-06 07:13:22 +02001030 c_adv(&s->req, rewind);
Willy Tarreaub1d67742010-03-29 19:36:59 +02001031 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001032 break;
1033 default:
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001034 memset(&srv_conn->addr.from, 0, sizeof(srv_conn->addr.from));
Willy Tarreaub1d67742010-03-29 19:36:59 +02001035 }
1036#endif
1037}
1038
1039
Willy Tarreaubaaee002006-06-26 02:48:02 +02001040/*
Willy Tarreau87b09662015-04-03 00:22:06 +02001041 * This function initiates a connection to the server assigned to this stream
Willy Tarreau350f4872014-11-28 14:42:25 +01001042 * (s->target, s->si[1].addr.to). It will assign a server if none
Willy Tarreau664beb82011-03-10 11:38:29 +01001043 * is assigned yet.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001044 * It can return one of :
Willy Tarreaue7dff022015-04-03 01:14:29 +02001045 * - SF_ERR_NONE if everything's OK
1046 * - SF_ERR_SRVTO if there are no more servers
1047 * - SF_ERR_SRVCL if the connection was refused by the server
1048 * - SF_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
1049 * - SF_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
1050 * - SF_ERR_INTERNAL for any other purely internal errors
Tim Düsterhus4896c442016-11-29 02:15:19 +01001051 * Additionally, in the case of SF_ERR_RESOURCE, an emergency log will be emitted.
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001052 * The server-facing stream interface is expected to hold a pre-allocated connection
Willy Tarreau350f4872014-11-28 14:42:25 +01001053 * in s->si[1].conn.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001054 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001055int connect_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001056{
Olivier Houchard522eea72017-11-03 16:27:47 +01001057 struct connection *cli_conn = NULL;
Willy Tarreau34601a82013-12-15 16:33:46 +01001058 struct connection *srv_conn;
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001059 struct conn_stream *srv_cs;
1060 struct conn_stream *old_cs;
Willy Tarreau827aee92011-03-10 16:55:02 +01001061 struct server *srv;
Willy Tarreau34601a82013-12-15 16:33:46 +01001062 int reuse = 0;
Willy Tarreau9650f372009-08-16 14:02:45 +02001063 int err;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001064
Willy Tarreau7b004922015-08-04 19:34:21 +02001065 srv = objt_server(s->target);
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001066 srv_cs = objt_cs(s->si[1].end);
1067 srv_conn = cs_conn(srv_cs);
Willy Tarreau34601a82013-12-15 16:33:46 +01001068 if (srv_conn)
1069 reuse = s->target == srv_conn->target;
1070
Willy Tarreau8dff9982015-08-04 20:45:52 +02001071 if (srv && !reuse) {
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001072 old_cs = srv_cs;
1073 if (old_cs) {
Willy Tarreau8dff9982015-08-04 20:45:52 +02001074 srv_conn = NULL;
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001075 srv_cs->data = NULL;
Willy Tarreauefb90f92015-08-06 11:37:10 +02001076 si_detach_endpoint(&s->si[1]);
1077 /* note: if the connection was in a server's idle
1078 * queue, it doesn't get dequeued.
1079 */
Willy Tarreau8dff9982015-08-04 20:45:52 +02001080 }
1081
Willy Tarreau449d74a2015-08-05 17:16:33 +02001082 /* Below we pick connections from the safe or idle lists based
1083 * on the strategy, the fact that this is a first or second
1084 * (retryable) request, with the indicated priority (1 or 2) :
1085 *
1086 * SAFE AGGR ALWS
1087 *
1088 * +-----+-----+ +-----+-----+ +-----+-----+
1089 * req| 1st | 2nd | req| 1st | 2nd | req| 1st | 2nd |
1090 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1091 * safe| - | 2 | safe| 1 | 2 | safe| 1 | 2 |
1092 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1093 * idle| - | 1 | idle| - | 1 | idle| 2 | 1 |
1094 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1095 */
Christopher Faulet40a007c2017-07-03 15:41:01 +02001096 if (srv->idle_conns && !LIST_ISEMPTY(&srv->idle_conns[tid]) &&
Willy Tarreau449d74a2015-08-05 17:16:33 +02001097 ((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR &&
1098 s->txn && (s->txn->flags & TX_NOT_FIRST))) {
Christopher Faulet40a007c2017-07-03 15:41:01 +02001099 srv_conn = LIST_ELEM(srv->idle_conns[tid].n, struct connection *, list);
Willy Tarreau449d74a2015-08-05 17:16:33 +02001100 }
Christopher Faulet40a007c2017-07-03 15:41:01 +02001101 else if (srv->safe_conns && !LIST_ISEMPTY(&srv->safe_conns[tid]) &&
Willy Tarreau449d74a2015-08-05 17:16:33 +02001102 ((s->txn && (s->txn->flags & TX_NOT_FIRST)) ||
1103 (s->be->options & PR_O_REUSE_MASK) >= PR_O_REUSE_AGGR)) {
Christopher Faulet40a007c2017-07-03 15:41:01 +02001104 srv_conn = LIST_ELEM(srv->safe_conns[tid].n, struct connection *, list);
Willy Tarreau449d74a2015-08-05 17:16:33 +02001105 }
Christopher Faulet40a007c2017-07-03 15:41:01 +02001106 else if (srv->idle_conns && !LIST_ISEMPTY(&srv->idle_conns[tid]) &&
Willy Tarreau449d74a2015-08-05 17:16:33 +02001107 (s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) {
Christopher Faulet40a007c2017-07-03 15:41:01 +02001108 srv_conn = LIST_ELEM(srv->idle_conns[tid].n, struct connection *, list);
Willy Tarreau449d74a2015-08-05 17:16:33 +02001109 }
Willy Tarreau8dff9982015-08-04 20:45:52 +02001110
Willy Tarreau449d74a2015-08-05 17:16:33 +02001111 /* If we've picked a connection from the pool, we now have to
1112 * detach it. We may have to get rid of the previous idle
1113 * connection we had, so for this we try to swap it with the
1114 * other owner's. That way it may remain alive for others to
1115 * pick.
1116 */
1117 if (srv_conn) {
Willy Tarreau8dff9982015-08-04 20:45:52 +02001118 LIST_DEL(&srv_conn->list);
1119 LIST_INIT(&srv_conn->list);
1120
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001121 /* XXX cognet: this assumes only 1 conn_stream per
1122 * connection, has to be revisited later
1123 */
1124 srv_cs = srv_conn->mux_ctx;
1125
Christopher Fauletb75bb212018-05-23 16:53:38 +02001126 if (srv_cs->data) {
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001127 si_detach_endpoint(srv_cs->data);
1128 if (old_cs && !(old_cs->conn->flags & CO_FL_PRIVATE)) {
1129 si_attach_cs(srv_cs->data, old_cs);
1130 si_idle_cs(srv_cs->data, NULL);
Willy Tarreau0aae4802016-02-02 18:29:05 +01001131 }
Willy Tarreauefb90f92015-08-06 11:37:10 +02001132 }
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001133 si_attach_cs(&s->si[1], srv_cs);
Willy Tarreau8dff9982015-08-04 20:45:52 +02001134 reuse = 1;
1135 }
Willy Tarreauefb90f92015-08-06 11:37:10 +02001136
Willy Tarreau449d74a2015-08-05 17:16:33 +02001137 /* we may have to release our connection if we couldn't swap it */
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001138 if (old_cs && !old_cs->data)
1139 cs_destroy(old_cs);
Willy Tarreau8dff9982015-08-04 20:45:52 +02001140 }
1141
Willy Tarreau34601a82013-12-15 16:33:46 +01001142 if (reuse) {
1143 /* Disable connection reuse if a dynamic source is used.
1144 * As long as we don't share connections between servers,
1145 * we don't need to disable connection reuse on no-idempotent
1146 * requests nor when PROXY protocol is used.
1147 */
Willy Tarreau34601a82013-12-15 16:33:46 +01001148 if (srv && srv->conn_src.opts & CO_SRC_BIND) {
1149 if ((srv->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1150 reuse = 0;
1151 }
1152 else if (s->be->conn_src.opts & CO_SRC_BIND) {
1153 if ((s->be->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1154 reuse = 0;
1155 }
1156 }
1157
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001158 if (!reuse) {
1159 srv_cs = si_alloc_cs(&s->si[1], NULL);
1160 srv_conn = cs_conn(srv_cs);
1161 } else {
Willy Tarreau323a2d92015-08-04 19:00:17 +02001162 /* reusing our connection, take it out of the idle list */
1163 LIST_DEL(&srv_conn->list);
1164 LIST_INIT(&srv_conn->list);
1165 }
Willy Tarreauc12b5e62015-08-04 19:45:36 +02001166
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001167 if (!srv_cs)
Willy Tarreaue7dff022015-04-03 01:14:29 +02001168 return SF_ERR_RESOURCE;
Willy Tarreau32e3c6a2013-10-11 19:34:20 +02001169
Willy Tarreaue7dff022015-04-03 01:14:29 +02001170 if (!(s->flags & SF_ADDR_SET)) {
Willy Tarreaubaaee002006-06-26 02:48:02 +02001171 err = assign_server_address(s);
1172 if (err != SRV_STATUS_OK)
Willy Tarreaue7dff022015-04-03 01:14:29 +02001173 return SF_ERR_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001174 }
1175
Willy Tarreauff605db2013-12-20 11:09:51 +01001176 if (!conn_xprt_ready(srv_conn)) {
Willy Tarreau87b09662015-04-03 00:22:06 +02001177 /* the target was only on the stream, assign it to the SI now */
Willy Tarreauff605db2013-12-20 11:09:51 +01001178 srv_conn->target = s->target;
Willy Tarreaud88edf22009-06-14 15:48:17 +02001179
Willy Tarreauff605db2013-12-20 11:09:51 +01001180 /* set the correct protocol on the output stream interface */
Christopher Faulet2bf88c02018-02-28 10:33:34 +01001181 if (srv)
Willy Tarreau7b004922015-08-04 19:34:21 +02001182 conn_prepare(srv_conn, protocol_by_family(srv_conn->addr.to.ss_family), srv->xprt);
Willy Tarreauff605db2013-12-20 11:09:51 +01001183 else if (obj_type(s->target) == OBJ_TYPE_PROXY) {
1184 /* proxies exclusively run on raw_sock right now */
Willy Tarreaua261e9b2016-12-22 20:44:00 +01001185 conn_prepare(srv_conn, protocol_by_family(srv_conn->addr.to.ss_family), xprt_get(XPRT_RAW));
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001186 if (!objt_cs(s->si[1].end) || !objt_cs(s->si[1].end)->conn->ctrl)
Willy Tarreaue7dff022015-04-03 01:14:29 +02001187 return SF_ERR_INTERNAL;
Willy Tarreauff605db2013-12-20 11:09:51 +01001188 }
1189 else
Willy Tarreaue7dff022015-04-03 01:14:29 +02001190 return SF_ERR_INTERNAL; /* how did we get there ? */
Willy Tarreaud02394b2012-05-11 18:32:18 +02001191
Willy Tarreau33dd4ef2018-10-03 10:20:19 +02001192 if (conn_install_mux_be(srv_conn, srv_cs) < 0)
1193 return SF_ERR_INTERNAL;
Christopher Faulet2bf88c02018-02-28 10:33:34 +01001194
Willy Tarreauff605db2013-12-20 11:09:51 +01001195 /* process the case where the server requires the PROXY protocol to be sent */
1196 srv_conn->send_proxy_ofs = 0;
Olivier Houchard522eea72017-11-03 16:27:47 +01001197 cli_conn = objt_conn(strm_orig(s));
1198
Willy Tarreau7b004922015-08-04 19:34:21 +02001199 if (srv && srv->pp_opts) {
Willy Tarreau387ebf82015-08-04 19:24:13 +02001200 srv_conn->flags |= CO_FL_PRIVATE;
Willy Tarreauff605db2013-12-20 11:09:51 +01001201 srv_conn->send_proxy_ofs = 1; /* must compute size */
Willy Tarreauff605db2013-12-20 11:09:51 +01001202 if (cli_conn)
1203 conn_get_to_addr(cli_conn);
1204 }
Willy Tarreau2a6e8802013-10-24 15:50:53 +02001205
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001206 si_attach_cs(&s->si[1], srv_cs);
Willy Tarreau26d8c592012-05-07 18:12:14 +02001207
Willy Tarreauff605db2013-12-20 11:09:51 +01001208 assign_tproxy_address(s);
1209 }
1210 else {
1211 /* the connection is being reused, just re-attach it */
Olivier Houchard9aaf7782017-09-13 18:30:23 +02001212 si_attach_cs(&s->si[1], srv_cs);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001213 s->flags |= SF_SRV_REUSED;
Willy Tarreauff605db2013-12-20 11:09:51 +01001214 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001215
William Lallemandb7ff6a32012-03-02 14:35:21 +01001216 /* flag for logging source ip/port */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001217 if (strm_fe(s)->options2 & PR_O2_SRC_ADDR)
Willy Tarreau350f4872014-11-28 14:42:25 +01001218 s->si[1].flags |= SI_FL_SRC_ADDR;
William Lallemandb7ff6a32012-03-02 14:35:21 +01001219
Willy Tarreau14f8e862012-08-30 22:23:13 +02001220 /* disable lingering */
1221 if (s->be->options & PR_O_TCP_NOLING)
Willy Tarreau350f4872014-11-28 14:42:25 +01001222 s->si[1].flags |= SI_FL_NOLINGER;
Willy Tarreau14f8e862012-08-30 22:23:13 +02001223
Willy Tarreau350f4872014-11-28 14:42:25 +01001224 err = si_connect(&s->si[1]);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001225
Willy Tarreau46c9d3e2017-11-08 14:25:59 +01001226#ifdef USE_OPENSSL
Olivier Houchard522eea72017-11-03 16:27:47 +01001227 if (!reuse && cli_conn && srv &&
1228 (srv->ssl_ctx.options & SRV_SSL_O_EARLY_DATA) &&
1229 (cli_conn->flags & CO_FL_EARLY_DATA) &&
1230 !channel_is_empty(si_oc(&s->si[1])) &&
1231 srv_conn->flags & CO_FL_SSL_WAIT_HS) {
1232 srv_conn->flags &= ~(CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN);
1233 srv_conn->flags |= CO_FL_EARLY_SSL_HS;
1234 }
Willy Tarreau46c9d3e2017-11-08 14:25:59 +01001235#endif
Olivier Houchard522eea72017-11-03 16:27:47 +01001236
Willy Tarreaue7dff022015-04-03 01:14:29 +02001237 if (err != SF_ERR_NONE)
Willy Tarreau9650f372009-08-16 14:02:45 +02001238 return err;
Willy Tarreau788e2842008-08-26 13:25:39 +02001239
Willy Tarreau14f8e862012-08-30 22:23:13 +02001240 /* set connect timeout */
Willy Tarreau350f4872014-11-28 14:42:25 +01001241 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.connect);
Willy Tarreau14f8e862012-08-30 22:23:13 +02001242
Willy Tarreau827aee92011-03-10 16:55:02 +01001243 if (srv) {
Christopher Faulet29f77e82017-06-08 14:04:45 +02001244 int count;
1245
Willy Tarreaue7dff022015-04-03 01:14:29 +02001246 s->flags |= SF_CURR_SESS;
Christopher Faulet29f77e82017-06-08 14:04:45 +02001247 count = HA_ATOMIC_ADD(&srv->cur_sess, 1);
1248 HA_ATOMIC_UPDATE_MAX(&srv->counters.cur_sess_max, count);
Willy Tarreau51406232008-03-10 22:04:20 +01001249 if (s->be->lbprm.server_take_conn)
Willy Tarreau827aee92011-03-10 16:55:02 +01001250 s->be->lbprm.server_take_conn(srv);
Willy Tarreau732eac42015-07-09 11:40:25 +02001251
1252#ifdef USE_OPENSSL
1253 if (srv->ssl_ctx.sni) {
1254 struct sample *smp;
1255 int rewind;
1256
1257 /* Tricky case : we have already scheduled the pending
1258 * HTTP request or TCP data for leaving. So in HTTP we
1259 * rewind exactly the headers, otherwise we rewind the
1260 * output data.
1261 */
Willy Tarreau6a445eb2018-06-19 07:04:45 +02001262 rewind = s->txn ? http_hdr_rewind(&s->txn->req) : co_data(&s->req);
Willy Tarreaubcbd3932018-06-06 07:13:22 +02001263 c_rew(&s->req, rewind);
Willy Tarreau732eac42015-07-09 11:40:25 +02001264
1265 smp = sample_fetch_as_type(s->be, s->sess, s, SMP_OPT_DIR_REQ | SMP_OPT_FINAL, srv->ssl_ctx.sni, SMP_T_STR);
1266
1267 /* restore the pointers */
Willy Tarreaubcbd3932018-06-06 07:13:22 +02001268 c_adv(&s->req, rewind);
Willy Tarreau732eac42015-07-09 11:40:25 +02001269
Willy Tarreau2e0565c2016-08-09 11:55:21 +02001270 if (smp_make_safe(smp)) {
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001271 ssl_sock_set_servername(srv_conn,
1272 smp->data.u.str.area);
Willy Tarreau387ebf82015-08-04 19:24:13 +02001273 srv_conn->flags |= CO_FL_PRIVATE;
Willy Tarreau732eac42015-07-09 11:40:25 +02001274 }
1275 }
1276#endif /* USE_OPENSSL */
1277
Willy Tarreaubaaee002006-06-26 02:48:02 +02001278 }
1279
Willy Tarreaue7dff022015-04-03 01:14:29 +02001280 return SF_ERR_NONE; /* connection is OK */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001281}
1282
1283
Willy Tarreaubaaee002006-06-26 02:48:02 +02001284/* This function performs the "redispatch" part of a connection attempt. It
1285 * will assign a server if required, queue the connection if required, and
1286 * handle errors that might arise at this level. It can change the server
1287 * state. It will return 1 if it encounters an error, switches the server
1288 * state, or has to queue a connection. Otherwise, it will return 0 indicating
1289 * that the connection is ready to use.
1290 */
1291
Willy Tarreau87b09662015-04-03 00:22:06 +02001292int srv_redispatch_connect(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001293{
Willy Tarreau827aee92011-03-10 16:55:02 +01001294 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001295 int conn_err;
1296
1297 /* We know that we don't have any connection pending, so we will
1298 * try to get a new one, and wait in this state if it's queued
1299 */
Willy Tarreau7c669d72008-06-20 15:04:11 +02001300 redispatch:
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001301 conn_err = assign_server_and_queue(s);
1302 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +01001303
Willy Tarreaubaaee002006-06-26 02:48:02 +02001304 switch (conn_err) {
1305 case SRV_STATUS_OK:
1306 break;
1307
Willy Tarreau7c669d72008-06-20 15:04:11 +02001308 case SRV_STATUS_FULL:
1309 /* The server has reached its maxqueue limit. Either PR_O_REDISP is set
1310 * and we can redispatch to another server, or it is not and we return
1311 * 503. This only makes sense in DIRECT mode however, because normal LB
1312 * algorithms would never select such a server, and hash algorithms
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001313 * would bring us on the same server again. Note that s->target is set
Willy Tarreau827aee92011-03-10 16:55:02 +01001314 * in this case.
Willy Tarreau7c669d72008-06-20 15:04:11 +02001315 */
Willy Tarreaue7dff022015-04-03 01:14:29 +02001316 if (((s->flags & (SF_DIRECT|SF_FORCE_PRST)) == SF_DIRECT) &&
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001317 (s->be->options & PR_O_REDISP)) {
Willy Tarreaue7dff022015-04-03 01:14:29 +02001318 s->flags &= ~(SF_DIRECT | SF_ASSIGNED | SF_ADDR_SET);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001319 goto redispatch;
1320 }
1321
Willy Tarreau350f4872014-11-28 14:42:25 +01001322 if (!s->si[1].err_type) {
1323 s->si[1].err_type = SI_ET_QUEUE_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001324 }
Willy Tarreau7c669d72008-06-20 15:04:11 +02001325
Christopher Faulet29f77e82017-06-08 14:04:45 +02001326 HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
Christopher Fauletff8abcd2017-06-02 15:33:24 +02001327 HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001328 return 1;
1329
Willy Tarreaubaaee002006-06-26 02:48:02 +02001330 case SRV_STATUS_NOSRV:
Willy Tarreau827aee92011-03-10 16:55:02 +01001331 /* note: it is guaranteed that srv == NULL here */
Willy Tarreau350f4872014-11-28 14:42:25 +01001332 if (!s->si[1].err_type) {
1333 s->si[1].err_type = SI_ET_CONN_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001334 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +01001335
Christopher Fauletff8abcd2017-06-02 15:33:24 +02001336 HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001337 return 1;
1338
1339 case SRV_STATUS_QUEUED:
Willy Tarreau350f4872014-11-28 14:42:25 +01001340 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.queue);
1341 s->si[1].state = SI_ST_QUE;
Willy Tarreau87b09662015-04-03 00:22:06 +02001342 /* do nothing else and do not wake any other stream up */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001343 return 1;
1344
Willy Tarreaubaaee002006-06-26 02:48:02 +02001345 case SRV_STATUS_INTERNAL:
1346 default:
Willy Tarreau350f4872014-11-28 14:42:25 +01001347 if (!s->si[1].err_type) {
1348 s->si[1].err_type = SI_ET_CONN_OTHER;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001349 }
1350
Willy Tarreau827aee92011-03-10 16:55:02 +01001351 if (srv)
1352 srv_inc_sess_ctr(srv);
1353 if (srv)
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -05001354 srv_set_sess_last(srv);
1355 if (srv)
Christopher Faulet29f77e82017-06-08 14:04:45 +02001356 HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
Christopher Fauletff8abcd2017-06-02 15:33:24 +02001357 HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001358
Willy Tarreau87b09662015-04-03 00:22:06 +02001359 /* release other streams waiting for this server */
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001360 if (may_dequeue_tasks(srv, s->be))
Willy Tarreau827aee92011-03-10 16:55:02 +01001361 process_srv_queue(srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001362 return 1;
1363 }
1364 /* if we get here, it's because we got SRV_STATUS_OK, which also
1365 * means that the connection has not been queued.
1366 */
1367 return 0;
1368}
1369
Willy Tarreau4aac7db2014-05-16 11:48:10 +02001370/* sends a log message when a backend goes down, and also sets last
1371 * change date.
1372 */
1373void set_backend_down(struct proxy *be)
1374{
1375 be->last_change = now.tv_sec;
Christopher Fauletff8abcd2017-06-02 15:33:24 +02001376 HA_ATOMIC_ADD(&be->down_trans, 1);
Willy Tarreau4aac7db2014-05-16 11:48:10 +02001377
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01001378 if (!(global.mode & MODE_STARTING)) {
Christopher Faulet767a84b2017-11-24 16:50:31 +01001379 ha_alert("%s '%s' has no server available!\n", proxy_type_str(be), be->id);
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01001380 send_log(be, LOG_EMERG, "%s %s has no server available!\n", proxy_type_str(be), be->id);
1381 }
Willy Tarreau4aac7db2014-05-16 11:48:10 +02001382}
1383
Willy Tarreau87b09662015-04-03 00:22:06 +02001384/* Apply RDP cookie persistence to the current stream. For this, the function
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001385 * tries to extract an RDP cookie from the request buffer, and look for the
1386 * matching server in the list. If the server is found, it is assigned to the
Willy Tarreau87b09662015-04-03 00:22:06 +02001387 * stream. This always returns 1, and the analyser removes itself from the
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001388 * list. Nothing is performed if a server was already assigned.
1389 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001390int tcp_persist_rdp_cookie(struct stream *s, struct channel *req, int an_bit)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001391{
1392 struct proxy *px = s->be;
1393 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +02001394 struct sample smp;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001395 struct server *srv = px->srv;
Willy Tarreau04276f32017-01-06 17:41:29 +01001396 uint16_t port;
1397 uint32_t addr;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001398 char *p;
1399
Christopher Faulet45073512018-07-20 10:16:29 +02001400 DPRINTF(stderr,"[%u] %s: stream=%p b=%p, exp(r,w)=%u,%u bf=%08x bh=%lu analysers=%02x\n",
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001401 now_ms, __FUNCTION__,
1402 s,
1403 req,
1404 req->rex, req->wex,
1405 req->flags,
Christopher Faulet45073512018-07-20 10:16:29 +02001406 ci_data(req),
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001407 req->analysers);
1408
Willy Tarreaue7dff022015-04-03 01:14:29 +02001409 if (s->flags & SF_ASSIGNED)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001410 goto no_cookie;
1411
Willy Tarreau37406352012-04-23 16:16:37 +02001412 memset(&smp, 0, sizeof(smp));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001413
Willy Tarreaucadd8c92013-07-22 18:09:52 +02001414 ret = fetch_rdp_cookie_name(s, &smp, s->be->rdp_cookie_name, s->be->rdp_cookie_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001415 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || smp.data.u.str.data == 0)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001416 goto no_cookie;
1417
Willy Tarreau04276f32017-01-06 17:41:29 +01001418 /* Considering an rdp cookie detected using acl, str ended with <cr><lf> and should return.
1419 * The cookie format is <ip> "." <port> where "ip" is the integer corresponding to the
1420 * server's IP address in network order, and "port" is the integer corresponding to the
1421 * server's port in network order. Comments please Emeric.
1422 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001423 addr = strtoul(smp.data.u.str.area, &p, 10);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001424 if (*p != '.')
1425 goto no_cookie;
1426 p++;
Willy Tarreau04276f32017-01-06 17:41:29 +01001427
1428 port = ntohs(strtoul(p, &p, 10));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001429 if (*p != '.')
1430 goto no_cookie;
1431
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001432 s->target = NULL;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001433 while (srv) {
Willy Tarreau28e9d062014-05-09 22:47:50 +02001434 if (srv->addr.ss_family == AF_INET &&
Willy Tarreau04276f32017-01-06 17:41:29 +01001435 port == srv->svc_port &&
1436 addr == ((struct sockaddr_in *)&srv->addr)->sin_addr.s_addr) {
Emeric Brun52a91d32017-08-31 14:41:55 +02001437 if ((srv->cur_state != SRV_ST_STOPPED) || (px->options & PR_O_PERSIST)) {
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001438 /* we found the server and it is usable */
Willy Tarreaue7dff022015-04-03 01:14:29 +02001439 s->flags |= SF_DIRECT | SF_ASSIGNED;
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001440 s->target = &srv->obj_type;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001441 break;
1442 }
1443 }
1444 srv = srv->next;
1445 }
1446
1447no_cookie:
1448 req->analysers &= ~an_bit;
1449 req->analyse_exp = TICK_ETERNITY;
1450 return 1;
1451}
1452
Krzysztof Oledzki85130942007-10-22 16:21:10 +02001453int be_downtime(struct proxy *px) {
Willy Tarreaub625a082007-11-26 01:15:43 +01001454 if (px->lbprm.tot_weight && px->last_change < now.tv_sec) // ignore negative time
Krzysztof Oledzki85130942007-10-22 16:21:10 +02001455 return px->down_time;
1456
1457 return now.tv_sec - px->last_change + px->down_time;
1458}
Willy Tarreaubaaee002006-06-26 02:48:02 +02001459
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01001460/*
1461 * This function returns a string containing the balancing
1462 * mode of the proxy in a format suitable for stats.
1463 */
1464
1465const char *backend_lb_algo_str(int algo) {
1466
1467 if (algo == BE_LB_ALGO_RR)
1468 return "roundrobin";
1469 else if (algo == BE_LB_ALGO_SRR)
1470 return "static-rr";
Willy Tarreauf09c6602012-02-13 17:12:08 +01001471 else if (algo == BE_LB_ALGO_FAS)
1472 return "first";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01001473 else if (algo == BE_LB_ALGO_LC)
1474 return "leastconn";
1475 else if (algo == BE_LB_ALGO_SH)
1476 return "source";
1477 else if (algo == BE_LB_ALGO_UH)
1478 return "uri";
1479 else if (algo == BE_LB_ALGO_PH)
1480 return "url_param";
1481 else if (algo == BE_LB_ALGO_HH)
1482 return "hdr";
1483 else if (algo == BE_LB_ALGO_RCH)
1484 return "rdp-cookie";
Willy Tarreaub3e111b2016-11-26 15:52:04 +01001485 else if (algo == BE_LB_ALGO_NONE)
1486 return "none";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01001487 else
Willy Tarreaub3e111b2016-11-26 15:52:04 +01001488 return "unknown";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01001489}
1490
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001491/* This function parses a "balance" statement in a backend section describing
1492 * <curproxy>. It returns -1 if there is any error, otherwise zero. If it
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001493 * returns -1, it will write an error message into the <err> buffer which will
1494 * automatically be allocated and must be passed as NULL. The trailing '\n'
1495 * will not be written. The function must be called with <args> pointing to the
1496 * first word after "balance".
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001497 */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001498int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001499{
1500 if (!*(args[0])) {
1501 /* if no option is set, use round-robin by default */
Willy Tarreau31682232007-11-29 15:38:04 +01001502 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1503 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001504 return 0;
1505 }
1506
1507 if (!strcmp(args[0], "roundrobin")) {
Willy Tarreau31682232007-11-29 15:38:04 +01001508 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1509 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001510 }
Willy Tarreau9757a382009-10-03 12:56:50 +02001511 else if (!strcmp(args[0], "static-rr")) {
1512 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1513 curproxy->lbprm.algo |= BE_LB_ALGO_SRR;
1514 }
Willy Tarreauf09c6602012-02-13 17:12:08 +01001515 else if (!strcmp(args[0], "first")) {
1516 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1517 curproxy->lbprm.algo |= BE_LB_ALGO_FAS;
1518 }
Willy Tarreau51406232008-03-10 22:04:20 +01001519 else if (!strcmp(args[0], "leastconn")) {
1520 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1521 curproxy->lbprm.algo |= BE_LB_ALGO_LC;
1522 }
Willy Tarreau760e81d2018-05-03 07:20:40 +02001523 else if (!strcmp(args[0], "random")) {
1524 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1525 curproxy->lbprm.algo |= BE_LB_ALGO_RND;
1526 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001527 else if (!strcmp(args[0], "source")) {
Willy Tarreau31682232007-11-29 15:38:04 +01001528 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1529 curproxy->lbprm.algo |= BE_LB_ALGO_SH;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001530 }
1531 else if (!strcmp(args[0], "uri")) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001532 int arg = 1;
1533
Willy Tarreau31682232007-11-29 15:38:04 +01001534 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1535 curproxy->lbprm.algo |= BE_LB_ALGO_UH;
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001536
Oskar Stolc8dc41842012-05-19 10:19:54 +01001537 curproxy->uri_whole = 0;
1538
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001539 while (*args[arg]) {
1540 if (!strcmp(args[arg], "len")) {
1541 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001542 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001543 return -1;
1544 }
1545 curproxy->uri_len_limit = atoi(args[arg+1]);
1546 arg += 2;
1547 }
1548 else if (!strcmp(args[arg], "depth")) {
1549 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001550 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001551 return -1;
1552 }
1553 /* hint: we store the position of the ending '/' (depth+1) so
1554 * that we avoid a comparison while computing the hash.
1555 */
1556 curproxy->uri_dirs_depth1 = atoi(args[arg+1]) + 1;
1557 arg += 2;
1558 }
Oskar Stolc8dc41842012-05-19 10:19:54 +01001559 else if (!strcmp(args[arg], "whole")) {
1560 curproxy->uri_whole = 1;
1561 arg += 1;
1562 }
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001563 else {
Oskar Stolc8dc41842012-05-19 10:19:54 +01001564 memprintf(err, "%s only accepts parameters 'len', 'depth', and 'whole' (got '%s').", args[0], args[arg]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001565 return -1;
1566 }
1567 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001568 }
Willy Tarreau01732802007-11-01 22:48:15 +01001569 else if (!strcmp(args[0], "url_param")) {
1570 if (!*args[1]) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001571 memprintf(err, "%s requires an URL parameter name.", args[0]);
Willy Tarreau01732802007-11-01 22:48:15 +01001572 return -1;
1573 }
Willy Tarreau31682232007-11-29 15:38:04 +01001574 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1575 curproxy->lbprm.algo |= BE_LB_ALGO_PH;
Willy Tarreaua534fea2008-08-03 12:19:50 +02001576
1577 free(curproxy->url_param_name);
Willy Tarreau01732802007-11-01 22:48:15 +01001578 curproxy->url_param_name = strdup(args[1]);
Willy Tarreaua534fea2008-08-03 12:19:50 +02001579 curproxy->url_param_len = strlen(args[1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001580 if (*args[2]) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02001581 if (strcmp(args[2], "check_post")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001582 memprintf(err, "%s only accepts 'check_post' modifier (got '%s').", args[0], args[2]);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02001583 return -1;
1584 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02001585 }
Benoitaffb4812009-03-25 13:02:10 +01001586 }
1587 else if (!strncmp(args[0], "hdr(", 4)) {
1588 const char *beg, *end;
1589
1590 beg = args[0] + 4;
1591 end = strchr(beg, ')');
1592
1593 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001594 memprintf(err, "hdr requires an http header field name.");
Benoitaffb4812009-03-25 13:02:10 +01001595 return -1;
1596 }
1597
1598 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1599 curproxy->lbprm.algo |= BE_LB_ALGO_HH;
1600
1601 free(curproxy->hh_name);
1602 curproxy->hh_len = end - beg;
1603 curproxy->hh_name = my_strndup(beg, end - beg);
1604 curproxy->hh_match_domain = 0;
1605
1606 if (*args[1]) {
1607 if (strcmp(args[1], "use_domain_only")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001608 memprintf(err, "%s only accepts 'use_domain_only' modifier (got '%s').", args[0], args[1]);
Benoitaffb4812009-03-25 13:02:10 +01001609 return -1;
1610 }
1611 curproxy->hh_match_domain = 1;
1612 }
Emeric Brun736aa232009-06-30 17:56:00 +02001613 }
1614 else if (!strncmp(args[0], "rdp-cookie", 10)) {
1615 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1616 curproxy->lbprm.algo |= BE_LB_ALGO_RCH;
1617
1618 if ( *(args[0] + 10 ) == '(' ) { /* cookie name */
1619 const char *beg, *end;
1620
1621 beg = args[0] + 11;
1622 end = strchr(beg, ')');
1623
1624 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001625 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02001626 return -1;
1627 }
1628
1629 free(curproxy->hh_name);
1630 curproxy->hh_name = my_strndup(beg, end - beg);
1631 curproxy->hh_len = end - beg;
1632 }
1633 else if ( *(args[0] + 10 ) == '\0' ) { /* default cookie name 'mstshash' */
1634 free(curproxy->hh_name);
1635 curproxy->hh_name = strdup("mstshash");
1636 curproxy->hh_len = strlen(curproxy->hh_name);
1637 }
1638 else { /* syntax */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001639 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02001640 return -1;
1641 }
Willy Tarreau01732802007-11-01 22:48:15 +01001642 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001643 else {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001644 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 +01001645 return -1;
1646 }
1647 return 0;
1648}
1649
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001650
1651/************************************************************************/
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001652/* All supported sample and ACL keywords must be declared here. */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001653/************************************************************************/
1654
Willy Tarreau34db1082012-04-19 17:16:54 +02001655/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001656 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001657 * undefined behaviour.
1658 */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001659static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001660smp_fetch_nbsrv(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001661{
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02001662 struct proxy *px;
1663
Willy Tarreau37406352012-04-23 16:16:37 +02001664 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001665 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02001666 px = args->data.prx;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001667
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01001668 smp->data.u.sint = be_usable_srv(px);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001669
1670 return 1;
1671}
1672
Willy Tarreau37406352012-04-23 16:16:37 +02001673/* report in smp->flags a success or failure depending on the designated
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001674 * server's state. There is no match function involved since there's no pattern.
Willy Tarreau34db1082012-04-19 17:16:54 +02001675 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1676 * undefined behaviour.
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001677 */
1678static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001679smp_fetch_srv_is_up(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001680{
Willy Tarreau24e32d82012-04-23 23:55:44 +02001681 struct server *srv = args->data.srv;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001682
Willy Tarreau37406352012-04-23 16:16:37 +02001683 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001684 smp->data.type = SMP_T_BOOL;
Emeric Brun52a91d32017-08-31 14:41:55 +02001685 if (!(srv->cur_admin & SRV_ADMF_MAINT) &&
1686 (!(srv->check.state & CHK_ST_CONFIGURED) || (srv->cur_state != SRV_ST_STOPPED)))
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001687 smp->data.u.sint = 1;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001688 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001689 smp->data.u.sint = 0;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001690 return 1;
1691}
1692
Willy Tarreau34db1082012-04-19 17:16:54 +02001693/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001694 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001695 * undefined behaviour.
1696 */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001697static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001698smp_fetch_connslots(const struct arg *args, struct sample *smp, const char *kw, void *private)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001699{
1700 struct server *iterator;
Willy Tarreaud28c3532012-04-19 19:28:33 +02001701
Willy Tarreau37406352012-04-23 16:16:37 +02001702 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001703 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001704 smp->data.u.sint = 0;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001705
Willy Tarreau24e32d82012-04-23 23:55:44 +02001706 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +02001707 if (iterator->cur_state == SRV_ST_STOPPED)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001708 continue;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001709
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001710 if (iterator->maxconn == 0 || iterator->maxqueue == 0) {
Willy Tarreaua5e37562011-12-16 17:06:15 +01001711 /* configuration is stupid */
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001712 smp->data.u.sint = -1; /* FIXME: stupid value! */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001713 return 1;
1714 }
1715
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001716 smp->data.u.sint += (iterator->maxconn - iterator->cur_sess)
Willy Tarreau422aa072012-04-20 20:49:27 +02001717 + (iterator->maxqueue - iterator->nbpend);
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001718 }
1719
1720 return 1;
1721}
1722
Willy Tarreaua5e37562011-12-16 17:06:15 +01001723/* set temp integer to the id of the backend */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001724static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001725smp_fetch_be_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
Willy Tarreauf853c462012-04-23 18:53:56 +02001730 smp->flags = SMP_F_VOL_TXN;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001731 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001732 smp->data.u.sint = smp->strm->be->uuid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001733 return 1;
1734}
1735
Marcin Deranekd2471c22016-12-12 14:08:05 +01001736/* set string to the name of the backend */
1737static int
1738smp_fetch_be_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
1739{
1740 if (!smp->strm)
1741 return 0;
1742
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001743 smp->data.u.str.area = (char *)smp->strm->be->id;
1744 if (!smp->data.u.str.area)
Marcin Deranekd2471c22016-12-12 14:08:05 +01001745 return 0;
1746
1747 smp->data.type = SMP_T_STR;
1748 smp->flags = SMP_F_CONST;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001749 smp->data.u.str.data = strlen(smp->data.u.str.area);
Marcin Deranekd2471c22016-12-12 14:08:05 +01001750
1751 return 1;
1752}
1753
Willy Tarreaua5e37562011-12-16 17:06:15 +01001754/* set temp integer to the id of the server */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001755static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001756smp_fetch_srv_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02001757{
Willy Tarreaube508f12016-03-10 11:47:01 +01001758 if (!smp->strm)
1759 return 0;
1760
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02001761 if (!objt_server(smp->strm->target))
Willy Tarreau17af4192011-02-23 14:27:06 +01001762 return 0;
1763
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001764 smp->data.type = SMP_T_SINT;
Willy Tarreau1e582e52018-09-20 11:29:28 +02001765 smp->data.u.sint = __objt_server(smp->strm->target)->puid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001766
1767 return 1;
1768}
1769
Willy Tarreau34db1082012-04-19 17:16:54 +02001770/* set temp integer to the number of connections per second reaching the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001771 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001772 * undefined behaviour.
1773 */
Willy Tarreau079ff0a2009-03-05 21:34:28 +01001774static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001775smp_fetch_be_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau079ff0a2009-03-05 21:34:28 +01001776{
Willy Tarreau37406352012-04-23 16:16:37 +02001777 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001778 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001779 smp->data.u.sint = read_freq_ctr(&args->data.prx->be_sess_per_sec);
Willy Tarreau079ff0a2009-03-05 21:34:28 +01001780 return 1;
1781}
1782
Willy Tarreau34db1082012-04-19 17:16:54 +02001783/* set temp integer to the number of concurrent connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001784 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001785 * undefined behaviour.
1786 */
Willy Tarreaua36af912009-10-10 12:02:45 +02001787static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001788smp_fetch_be_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02001789{
Willy Tarreau37406352012-04-23 16:16:37 +02001790 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001791 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001792 smp->data.u.sint = args->data.prx->beconn;
Willy Tarreaua36af912009-10-10 12:02:45 +02001793 return 1;
1794}
1795
Patrick Hemmer4cdf3ab2018-06-14 17:10:27 -04001796/* set temp integer to the number of available connections across available
1797 * servers on the backend.
1798 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
1799 * undefined behaviour.
1800 */
1801static int
1802smp_fetch_be_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
1803{
1804 struct server *iterator;
1805 struct proxy *px;
1806 unsigned int maxconn;
1807
1808 smp->flags = SMP_F_VOL_TEST;
1809 smp->data.type = SMP_T_SINT;
1810 smp->data.u.sint = 0;
1811
1812 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
1813 if (iterator->cur_state == SRV_ST_STOPPED)
1814 continue;
1815
1816 px = iterator->proxy;
1817 if (!srv_currently_usable(iterator) ||
1818 ((iterator->flags & SRV_F_BACKUP) &&
1819 (px->srv_act || (iterator != px->lbprm.fbck && !(px->options & PR_O_USE_ALL_BK)))))
1820 continue;
1821
1822 if (iterator->maxconn == 0) {
1823 /* one active server is unlimited, return -1 */
1824 smp->data.u.sint = -1;
1825 return 1;
1826 }
1827
1828 maxconn = srv_dynamic_maxconn(iterator);
1829 if (maxconn > iterator->cur_sess)
1830 smp->data.u.sint += maxconn - iterator->cur_sess;
1831 }
1832
1833 return 1;
1834}
1835
Willy Tarreau34db1082012-04-19 17:16:54 +02001836/* set temp integer to the total number of queued connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001837 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001838 * undefined behaviour.
1839 */
Willy Tarreaua36af912009-10-10 12:02:45 +02001840static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001841smp_fetch_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02001842{
Willy Tarreau37406352012-04-23 16:16:37 +02001843 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001844 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001845 smp->data.u.sint = args->data.prx->totpend;
Willy Tarreaua36af912009-10-10 12:02:45 +02001846 return 1;
1847}
1848
Willy Tarreaua5e37562011-12-16 17:06:15 +01001849/* set temp integer to the total number of queued connections on the backend divided
Willy Tarreaua36af912009-10-10 12:02:45 +02001850 * by the number of running servers and rounded up. If there is no running
1851 * server, we return twice the total, just as if we had half a running server.
1852 * This is more or less correct anyway, since we expect the last server to come
1853 * back soon.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001854 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001855 * undefined behaviour.
Willy Tarreaua36af912009-10-10 12:02:45 +02001856 */
1857static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001858smp_fetch_avg_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02001859{
1860 int nbsrv;
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02001861 struct proxy *px;
Willy Tarreaua36af912009-10-10 12:02:45 +02001862
Willy Tarreau37406352012-04-23 16:16:37 +02001863 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001864 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02001865 px = args->data.prx;
Willy Tarreaua36af912009-10-10 12:02:45 +02001866
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01001867 nbsrv = be_usable_srv(px);
Willy Tarreaua36af912009-10-10 12:02:45 +02001868
1869 if (nbsrv > 0)
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001870 smp->data.u.sint = (px->totpend + nbsrv - 1) / nbsrv;
Willy Tarreaua36af912009-10-10 12:02:45 +02001871 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001872 smp->data.u.sint = px->totpend * 2;
Willy Tarreaua36af912009-10-10 12:02:45 +02001873
1874 return 1;
1875}
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001876
Willy Tarreau34db1082012-04-19 17:16:54 +02001877/* set temp integer to the number of concurrent connections on the server in the backend.
1878 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1879 * undefined behaviour.
1880 */
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02001881static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001882smp_fetch_srv_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02001883{
Willy Tarreauf853c462012-04-23 18:53:56 +02001884 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001885 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001886 smp->data.u.sint = args->data.srv->cur_sess;
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02001887 return 1;
1888}
1889
Patrick Hemmer155e93e2018-06-14 18:01:35 -04001890/* set temp integer to the number of available connections on the server in the backend.
1891 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1892 * undefined behaviour.
1893 */
1894static int
1895smp_fetch_srv_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
1896{
1897 unsigned int maxconn;
1898
1899 smp->flags = SMP_F_VOL_TEST;
1900 smp->data.type = SMP_T_SINT;
1901
1902 if (args->data.srv->maxconn == 0) {
1903 /* one active server is unlimited, return -1 */
1904 smp->data.u.sint = -1;
1905 return 1;
1906 }
1907
1908 maxconn = srv_dynamic_maxconn(args->data.srv);
1909 if (maxconn > args->data.srv->cur_sess)
1910 smp->data.u.sint = maxconn - args->data.srv->cur_sess;
1911 else
1912 smp->data.u.sint = 0;
1913
1914 return 1;
1915}
1916
Willy Tarreauff2b7af2017-10-13 11:46:26 +02001917/* set temp integer to the number of connections pending in the server's queue.
1918 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1919 * undefined behaviour.
1920 */
1921static int
1922smp_fetch_srv_queue(const struct arg *args, struct sample *smp, const char *kw, void *private)
1923{
1924 smp->flags = SMP_F_VOL_TEST;
1925 smp->data.type = SMP_T_SINT;
1926 smp->data.u.sint = args->data.srv->nbpend;
1927 return 1;
1928}
1929
Tait Clarridge7896d522012-12-05 21:39:31 -05001930/* set temp integer to the number of enabled servers on the proxy.
1931 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1932 * undefined behaviour.
1933 */
1934static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02001935smp_fetch_srv_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Tait Clarridge7896d522012-12-05 21:39:31 -05001936{
1937 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02001938 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02001939 smp->data.u.sint = read_freq_ctr(&args->data.srv->sess_per_sec);
Tait Clarridge7896d522012-12-05 21:39:31 -05001940 return 1;
1941}
1942
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01001943static int sample_conv_nbsrv(const struct arg *args, struct sample *smp, void *private)
1944{
1945
1946 struct proxy *px;
1947
1948 if (!smp_make_safe(smp))
1949 return 0;
1950
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001951 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01001952 if (!px)
1953 return 0;
1954
1955 smp->data.type = SMP_T_SINT;
1956 smp->data.u.sint = be_usable_srv(px);
1957
1958 return 1;
1959}
1960
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001961
1962/* Note: must not be declared <const> as its list will be overwritten.
1963 * Please take care of keeping this list alphabetically sorted.
1964 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02001965static struct sample_fetch_kw_list smp_kws = {ILH, {
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02001966 { "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1967 { "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Patrick Hemmer4cdf3ab2018-06-14 17:10:27 -04001968 { "be_conn_free", smp_fetch_be_conn_free, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02001969 { "be_id", smp_fetch_be_id, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
Marcin Deranekd2471c22016-12-12 14:08:05 +01001970 { "be_name", smp_fetch_be_name, 0, NULL, SMP_T_STR, SMP_USE_BKEND, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02001971 { "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1972 { "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1973 { "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1974 { "queue", smp_fetch_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
1975 { "srv_conn", smp_fetch_srv_conn, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Patrick Hemmer155e93e2018-06-14 18:01:35 -04001976 { "srv_conn_free", smp_fetch_srv_conn_free, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02001977 { "srv_id", smp_fetch_srv_id, 0, NULL, SMP_T_SINT, SMP_USE_SERVR, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001978 { "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 +02001979 { "srv_queue", smp_fetch_srv_queue, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02001980 { "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 +01001981 { /* END */ },
1982}};
1983
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01001984/* Note: must not be declared <const> as its list will be overwritten */
1985static struct sample_conv_kw_list sample_conv_kws = {ILH, {
1986 { "nbsrv", sample_conv_nbsrv, 0, NULL, SMP_T_STR, SMP_T_SINT },
1987 { /* END */ },
1988}};
1989
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001990
Willy Tarreau61612d42012-04-19 18:42:05 +02001991/* Note: must not be declared <const> as its list will be overwritten.
1992 * Please take care of keeping this list alphabetically sorted.
1993 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02001994static struct acl_kw_list acl_kws = {ILH, {
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001995 { /* END */ },
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001996}};
1997
1998
1999__attribute__((constructor))
2000static void __backend_init(void)
2001{
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002002 sample_register_fetches(&smp_kws);
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002003 sample_register_convs(&sample_conv_kws);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002004 acl_register_keywords(&acl_kws);
2005}
2006
Willy Tarreaubaaee002006-06-26 02:48:02 +02002007/*
2008 * Local variables:
2009 * c-indent-level: 8
2010 * c-basic-offset: 8
2011 * End:
2012 */