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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>
Willy Tarreaubaaee002006-06-26 02:48:02 +020029
Willy Tarreaubaaee002006-06-26 02:48:02 +020030#include <types/global.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020031
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +010032#include <proto/acl.h>
Willy Tarreau34db1082012-04-19 17:16:54 +020033#include <proto/arg.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020034#include <proto/backend.h>
Willy Tarreauc7e42382012-08-24 19:22:53 +020035#include <proto/channel.h>
Willy Tarreau03fa5df2010-05-24 21:02:37 +020036#include <proto/frontend.h>
Willy Tarreau6b2e11b2009-10-01 07:52:15 +020037#include <proto/lb_chash.h>
Willy Tarreauf09c6602012-02-13 17:12:08 +010038#include <proto/lb_fas.h>
Willy Tarreauf89c1872009-10-01 11:19:37 +020039#include <proto/lb_fwlc.h>
40#include <proto/lb_fwrr.h>
41#include <proto/lb_map.h>
Willy Tarreau4aac7db2014-05-16 11:48:10 +020042#include <proto/log.h>
Willy Tarreau3fdb3662012-11-12 00:42:33 +010043#include <proto/obj_type.h>
Willy Tarreaud4c33c82013-01-07 21:59:07 +010044#include <proto/payload.h>
Willy Tarreaud1d54542012-09-12 22:58:11 +020045#include <proto/protocol.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020046#include <proto/proto_http.h>
Willy Tarreaua8f55d52010-05-31 17:44:19 +020047#include <proto/proto_tcp.h>
Willy Tarreau4aac7db2014-05-16 11:48:10 +020048#include <proto/proxy.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020049#include <proto/queue.h>
Willy Tarreaud4c33c82013-01-07 21:59:07 +010050#include <proto/sample.h>
Willy Tarreau7f062c42009-03-05 18:43:00 +010051#include <proto/server.h>
Willy Tarreau7c669d72008-06-20 15:04:11 +020052#include <proto/session.h>
Willy Tarreau75bf2c92012-08-20 17:01:35 +020053#include <proto/raw_sock.h>
Willy Tarreau9e000c62011-03-10 14:03:36 +010054#include <proto/stream_interface.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020055#include <proto/task.h>
56
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -050057int be_lastsession(const struct proxy *be)
58{
59 if (be->be_counters.last_sess)
60 return now.tv_sec - be->be_counters.last_sess;
61
62 return -1;
63}
64
Bhaskar98634f02013-10-29 23:30:51 -040065/* helper function to invoke the correct hash method */
Dan Dubovik82456752014-07-08 08:51:03 -070066static unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len)
Bhaskar98634f02013-10-29 23:30:51 -040067{
Dan Dubovik82456752014-07-08 08:51:03 -070068 unsigned int hash;
Bhaskar98634f02013-10-29 23:30:51 -040069
70 switch (px->lbprm.algo & BE_LB_HASH_FUNC) {
71 case BE_LB_HFCN_DJB2:
72 hash = hash_djb2(key, len);
73 break;
Willy Tarreaua0f42712013-11-14 14:30:35 +010074 case BE_LB_HFCN_WT6:
75 hash = hash_wt6(key, len);
76 break;
Bhaskar98634f02013-10-29 23:30:51 -040077 case BE_LB_HFCN_SDBM:
78 /* this is the default hash function */
79 default:
80 hash = hash_sdbm(key, len);
81 break;
82 }
83
84 return hash;
85}
86
Willy Tarreaubaaee002006-06-26 02:48:02 +020087/*
88 * This function recounts the number of usable active and backup servers for
89 * proxy <p>. These numbers are returned into the p->srv_act and p->srv_bck.
Willy Tarreaub625a082007-11-26 01:15:43 +010090 * This function also recomputes the total active and backup weights. However,
Willy Tarreauf4cca452008-03-08 21:42:54 +010091 * it does not update tot_weight nor tot_used. Use update_backend_weight() for
Willy Tarreaub625a082007-11-26 01:15:43 +010092 * this.
Willy Tarreaubaaee002006-06-26 02:48:02 +020093 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +020094void recount_servers(struct proxy *px)
Willy Tarreaubaaee002006-06-26 02:48:02 +020095{
96 struct server *srv;
97
Willy Tarreau20697042007-11-15 23:26:18 +010098 px->srv_act = px->srv_bck = 0;
99 px->lbprm.tot_wact = px->lbprm.tot_wbck = 0;
Willy Tarreaub625a082007-11-26 01:15:43 +0100100 px->lbprm.fbck = NULL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200101 for (srv = px->srv; srv != NULL; srv = srv->next) {
Willy Tarreau87eb1d62014-05-13 18:51:40 +0200102 if (!srv_is_usable(srv))
Willy Tarreaub625a082007-11-26 01:15:43 +0100103 continue;
104
Willy Tarreauc93cd162014-05-13 15:54:22 +0200105 if (srv->flags & SRV_F_BACKUP) {
Willy Tarreaub625a082007-11-26 01:15:43 +0100106 if (!px->srv_bck &&
Willy Tarreauf4cca452008-03-08 21:42:54 +0100107 !(px->options & PR_O_USE_ALL_BK))
Willy Tarreaub625a082007-11-26 01:15:43 +0100108 px->lbprm.fbck = srv;
109 px->srv_bck++;
110 px->lbprm.tot_wbck += srv->eweight;
111 } else {
112 px->srv_act++;
113 px->lbprm.tot_wact += srv->eweight;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200114 }
115 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100116}
Willy Tarreau20697042007-11-15 23:26:18 +0100117
Willy Tarreaub625a082007-11-26 01:15:43 +0100118/* This function simply updates the backend's tot_weight and tot_used values
119 * after servers weights have been updated. It is designed to be used after
120 * recount_servers() or equivalent.
121 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200122void update_backend_weight(struct proxy *px)
Willy Tarreaub625a082007-11-26 01:15:43 +0100123{
Willy Tarreau20697042007-11-15 23:26:18 +0100124 if (px->srv_act) {
125 px->lbprm.tot_weight = px->lbprm.tot_wact;
126 px->lbprm.tot_used = px->srv_act;
127 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100128 else if (px->lbprm.fbck) {
129 /* use only the first backup server */
130 px->lbprm.tot_weight = px->lbprm.fbck->eweight;
131 px->lbprm.tot_used = 1;
Willy Tarreau20697042007-11-15 23:26:18 +0100132 }
133 else {
Willy Tarreaub625a082007-11-26 01:15:43 +0100134 px->lbprm.tot_weight = px->lbprm.tot_wbck;
135 px->lbprm.tot_used = px->srv_bck;
Willy Tarreau20697042007-11-15 23:26:18 +0100136 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100137}
138
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200139/*
140 * This function tries to find a running server for the proxy <px> following
141 * the source hash method. Depending on the number of active/backup servers,
142 * it will either look for active servers, or for backup servers.
143 * If any server is found, it will be returned. If no valid server is found,
144 * NULL is returned.
145 */
146struct server *get_server_sh(struct proxy *px, const char *addr, int len)
147{
148 unsigned int h, l;
149
150 if (px->lbprm.tot_weight == 0)
151 return NULL;
152
153 l = h = 0;
154
155 /* note: we won't hash if there's only one server left */
156 if (px->lbprm.tot_used == 1)
157 goto hash_done;
158
159 while ((l + sizeof (int)) <= len) {
160 h ^= ntohl(*(unsigned int *)(&addr[l]));
161 l += sizeof (int);
162 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500163 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100164 h = full_hash(h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200165 hash_done:
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200166 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
167 return chash_get_server_hash(px, h);
168 else
169 return map_get_server_hash(px, h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200170}
171
172/*
173 * This function tries to find a running server for the proxy <px> following
174 * the URI hash method. In order to optimize cache hits, the hash computation
175 * ends at the question mark. Depending on the number of active/backup servers,
176 * it will either look for active servers, or for backup servers.
177 * If any server is found, it will be returned. If no valid server is found,
178 * NULL is returned.
179 *
180 * This code was contributed by Guillaume Dallaire, who also selected this hash
181 * algorithm out of a tens because it gave him the best results.
182 *
183 */
184struct server *get_server_uh(struct proxy *px, char *uri, int uri_len)
185{
Dan Dubovik82456752014-07-08 08:51:03 -0700186 unsigned int hash = 0;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200187 int c;
188 int slashes = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400189 const char *start, *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200190
191 if (px->lbprm.tot_weight == 0)
192 return NULL;
193
194 /* note: we won't hash if there's only one server left */
195 if (px->lbprm.tot_used == 1)
196 goto hash_done;
197
198 if (px->uri_len_limit)
199 uri_len = MIN(uri_len, px->uri_len_limit);
200
Bhaskar98634f02013-10-29 23:30:51 -0400201 start = end = uri;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200202 while (uri_len--) {
Willy Tarreauac032922014-10-17 12:11:50 +0200203 c = *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200204 if (c == '/') {
205 slashes++;
206 if (slashes == px->uri_dirs_depth1) /* depth+1 */
207 break;
208 }
Oskar Stolc8dc41842012-05-19 10:19:54 +0100209 else if (c == '?' && !px->uri_whole)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200210 break;
Willy Tarreauac032922014-10-17 12:11:50 +0200211 end++;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200212 }
Bhaskar98634f02013-10-29 23:30:51 -0400213
214 hash = gen_hash(px, start, (end - start));
215
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500216 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100217 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200218 hash_done:
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200219 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
220 return chash_get_server_hash(px, hash);
221 else
222 return map_get_server_hash(px, hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200223}
224
Willy Tarreau01732802007-11-01 22:48:15 +0100225/*
226 * This function tries to find a running server for the proxy <px> following
227 * the URL parameter hash method. It looks for a specific parameter in the
228 * URL and hashes it to compute the server ID. This is useful to optimize
229 * performance by avoiding bounces between servers in contexts where sessions
230 * are shared but cookies are not usable. If the parameter is not found, NULL
231 * is returned. If any server is found, it will be returned. If no valid server
232 * is found, NULL is returned.
Willy Tarreau01732802007-11-01 22:48:15 +0100233 */
234struct server *get_server_ph(struct proxy *px, const char *uri, int uri_len)
235{
Dan Dubovik82456752014-07-08 08:51:03 -0700236 unsigned int hash = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400237 const char *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200238 const char *p;
239 const char *params;
Willy Tarreau01732802007-11-01 22:48:15 +0100240 int plen;
241
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200242 /* when tot_weight is 0 then so is srv_count */
Willy Tarreau20697042007-11-15 23:26:18 +0100243 if (px->lbprm.tot_weight == 0)
Willy Tarreau01732802007-11-01 22:48:15 +0100244 return NULL;
245
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200246 if ((p = memchr(uri, '?', uri_len)) == NULL)
247 return NULL;
248
Willy Tarreau01732802007-11-01 22:48:15 +0100249 p++;
250
251 uri_len -= (p - uri);
252 plen = px->url_param_len;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200253 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100254
255 while (uri_len > plen) {
256 /* Look for the parameter name followed by an equal symbol */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200257 if (params[plen] == '=') {
258 if (memcmp(params, px->url_param_name, plen) == 0) {
259 /* OK, we have the parameter here at <params>, and
Willy Tarreau01732802007-11-01 22:48:15 +0100260 * the value after the equal sign, at <p>
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200261 * skip the equal symbol
Willy Tarreau01732802007-11-01 22:48:15 +0100262 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200263 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400264 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200265 uri_len -= plen + 1;
266
Bhaskar98634f02013-10-29 23:30:51 -0400267 while (uri_len && *end != '&') {
Willy Tarreau01732802007-11-01 22:48:15 +0100268 uri_len--;
Bhaskar98634f02013-10-29 23:30:51 -0400269 end++;
Willy Tarreau01732802007-11-01 22:48:15 +0100270 }
Bhaskar98634f02013-10-29 23:30:51 -0400271 hash = gen_hash(px, start, (end - start));
272
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500273 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100274 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400275
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200276 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
277 return chash_get_server_hash(px, hash);
278 else
279 return map_get_server_hash(px, hash);
Willy Tarreau01732802007-11-01 22:48:15 +0100280 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200281 }
282 /* skip to next parameter */
283 p = memchr(params, '&', uri_len);
284 if (!p)
285 return NULL;
286 p++;
287 uri_len -= (p - params);
288 params = p;
289 }
290 return NULL;
291}
292
293/*
294 * this does the same as the previous server_ph, but check the body contents
295 */
296struct server *get_server_ph_post(struct session *s)
297{
Dan Dubovik82456752014-07-08 08:51:03 -0700298 unsigned int hash = 0;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200299 struct http_txn *txn = &s->txn;
Willy Tarreau7421efb2012-07-02 15:11:27 +0200300 struct channel *req = s->req;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200301 struct http_msg *msg = &txn->req;
302 struct proxy *px = s->be;
303 unsigned int plen = px->url_param_len;
Willy Tarreau2d8e4852014-04-17 20:08:17 +0200304 unsigned long len = http_body_bytes(msg);
Willy Tarreau0d090502014-04-17 20:31:44 +0200305 const char *params = b_ptr(req->buf, -http_data_rewind(msg));
Willy Tarreau157dd632009-12-06 19:18:09 +0100306 const char *p = params;
Bhaskar98634f02013-10-29 23:30:51 -0400307 const char *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200308
Willy Tarreau157dd632009-12-06 19:18:09 +0100309 if (len == 0)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200310 return NULL;
311
Willy Tarreau157dd632009-12-06 19:18:09 +0100312 if (px->lbprm.tot_weight == 0)
313 return NULL;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200314
315 while (len > plen) {
316 /* Look for the parameter name followed by an equal symbol */
317 if (params[plen] == '=') {
318 if (memcmp(params, px->url_param_name, plen) == 0) {
319 /* OK, we have the parameter here at <params>, and
320 * the value after the equal sign, at <p>
321 * skip the equal symbol
322 */
323 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400324 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200325 len -= plen + 1;
326
Bhaskar98634f02013-10-29 23:30:51 -0400327 while (len && *end != '&') {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200328 if (unlikely(!HTTP_IS_TOKEN(*p))) {
Willy Tarreau157dd632009-12-06 19:18:09 +0100329 /* if in a POST, body must be URI encoded or it's not a URI.
Bhaskar98634f02013-10-29 23:30:51 -0400330 * Do not interpret any possible binary data as a parameter.
Willy Tarreau157dd632009-12-06 19:18:09 +0100331 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200332 if (likely(HTTP_IS_LWS(*p))) /* eol, uncertain uri len */
333 break;
334 return NULL; /* oh, no; this is not uri-encoded.
335 * This body does not contain parameters.
336 */
337 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200338 len--;
Bhaskar98634f02013-10-29 23:30:51 -0400339 end++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200340 /* should we break if vlen exceeds limit? */
341 }
Bhaskar98634f02013-10-29 23:30:51 -0400342 hash = gen_hash(px, start, (end - start));
343
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500344 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100345 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400346
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200347 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
348 return chash_get_server_hash(px, hash);
349 else
350 return map_get_server_hash(px, hash);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200351 }
352 }
Willy Tarreau01732802007-11-01 22:48:15 +0100353 /* skip to next parameter */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200354 p = memchr(params, '&', len);
Willy Tarreau01732802007-11-01 22:48:15 +0100355 if (!p)
356 return NULL;
357 p++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200358 len -= (p - params);
359 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100360 }
361 return NULL;
362}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200363
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200364
Willy Tarreaubaaee002006-06-26 02:48:02 +0200365/*
Benoitaffb4812009-03-25 13:02:10 +0100366 * This function tries to find a running server for the proxy <px> following
367 * the Header parameter hash method. It looks for a specific parameter in the
368 * URL and hashes it to compute the server ID. This is useful to optimize
369 * performance by avoiding bounces between servers in contexts where sessions
370 * are shared but cookies are not usable. If the parameter is not found, NULL
371 * is returned. If any server is found, it will be returned. If no valid server
372 * is found, NULL is returned.
373 */
374struct server *get_server_hh(struct session *s)
375{
Dan Dubovik82456752014-07-08 08:51:03 -0700376 unsigned int hash = 0;
Benoitaffb4812009-03-25 13:02:10 +0100377 struct http_txn *txn = &s->txn;
Benoitaffb4812009-03-25 13:02:10 +0100378 struct proxy *px = s->be;
379 unsigned int plen = px->hh_len;
380 unsigned long len;
381 struct hdr_ctx ctx;
382 const char *p;
Bhaskar98634f02013-10-29 23:30:51 -0400383 const char *start, *end;
Benoitaffb4812009-03-25 13:02:10 +0100384
385 /* tot_weight appears to mean srv_count */
386 if (px->lbprm.tot_weight == 0)
387 return NULL;
388
Benoitaffb4812009-03-25 13:02:10 +0100389 ctx.idx = 0;
390
391 /* if the message is chunked, we skip the chunk size, but use the value as len */
Willy Tarreau211cdec2014-04-17 20:18:08 +0200392 http_find_header2(px->hh_name, plen, b_ptr(s->req->buf, -http_hdr_rewind(&txn->req)), &txn->hdr_idx, &ctx);
Benoitaffb4812009-03-25 13:02:10 +0100393
394 /* if the header is not found or empty, let's fallback to round robin */
395 if (!ctx.idx || !ctx.vlen)
396 return NULL;
397
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200398 /* note: we won't hash if there's only one server left */
399 if (px->lbprm.tot_used == 1)
400 goto hash_done;
401
Benoitaffb4812009-03-25 13:02:10 +0100402 /* Found a the hh_name in the headers.
403 * we will compute the hash based on this value ctx.val.
404 */
405 len = ctx.vlen;
406 p = (char *)ctx.line + ctx.val;
407 if (!px->hh_match_domain) {
Bhaskar98634f02013-10-29 23:30:51 -0400408 hash = gen_hash(px, p, len);
Benoitaffb4812009-03-25 13:02:10 +0100409 } else {
410 int dohash = 0;
411 p += len - 1;
Bhaskar98634f02013-10-29 23:30:51 -0400412 start = end = p;
Benoitaffb4812009-03-25 13:02:10 +0100413 /* special computation, use only main domain name, not tld/host
414 * going back from the end of string, start hashing at first
415 * dot stop at next.
416 * This is designed to work with the 'Host' header, and requires
417 * a special option to activate this.
418 */
419 while (len) {
420 if (*p == '.') {
Bhaskar98634f02013-10-29 23:30:51 -0400421 if (!dohash) {
Benoitaffb4812009-03-25 13:02:10 +0100422 dohash = 1;
Bhaskar98634f02013-10-29 23:30:51 -0400423 start = end = p - 1;
424 }
Benoitaffb4812009-03-25 13:02:10 +0100425 else
426 break;
427 } else {
428 if (dohash)
Bhaskar98634f02013-10-29 23:30:51 -0400429 start--;
Benoitaffb4812009-03-25 13:02:10 +0100430 }
431 len--;
432 p--;
433 }
Bhaskar98634f02013-10-29 23:30:51 -0400434 hash = gen_hash(px, start, (end - start));
Benoitaffb4812009-03-25 13:02:10 +0100435 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500436 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100437 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200438 hash_done:
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200439 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
440 return chash_get_server_hash(px, hash);
441 else
442 return map_get_server_hash(px, hash);
Benoitaffb4812009-03-25 13:02:10 +0100443}
444
Willy Tarreau34db1082012-04-19 17:16:54 +0200445/* RDP Cookie HASH. */
Emeric Brun736aa232009-06-30 17:56:00 +0200446struct server *get_server_rch(struct session *s)
447{
Dan Dubovik82456752014-07-08 08:51:03 -0700448 unsigned int hash = 0;
Emeric Brun736aa232009-06-30 17:56:00 +0200449 struct proxy *px = s->be;
450 unsigned long len;
Emeric Brun736aa232009-06-30 17:56:00 +0200451 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +0200452 struct sample smp;
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200453 int rewind;
Emeric Brun736aa232009-06-30 17:56:00 +0200454
455 /* tot_weight appears to mean srv_count */
456 if (px->lbprm.tot_weight == 0)
457 return NULL;
458
Willy Tarreau37406352012-04-23 16:16:37 +0200459 memset(&smp, 0, sizeof(smp));
Emeric Brun736aa232009-06-30 17:56:00 +0200460
Willy Tarreau9b28e032012-10-12 23:49:43 +0200461 b_rew(s->req->buf, rewind = s->req->buf->o);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200462
Willy Tarreaucadd8c92013-07-22 18:09:52 +0200463 ret = fetch_rdp_cookie_name(s, &smp, px->hh_name, px->hh_len);
Willy Tarreauf853c462012-04-23 18:53:56 +0200464 len = smp.data.str.len;
Willy Tarreau664092c2011-12-16 19:11:42 +0100465
Willy Tarreau9b28e032012-10-12 23:49:43 +0200466 b_adv(s->req->buf, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200467
Willy Tarreau37406352012-04-23 16:16:37 +0200468 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || len == 0)
Emeric Brun736aa232009-06-30 17:56:00 +0200469 return NULL;
470
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200471 /* note: we won't hash if there's only one server left */
472 if (px->lbprm.tot_used == 1)
473 goto hash_done;
474
Emeric Brun736aa232009-06-30 17:56:00 +0200475 /* Found a the hh_name in the headers.
476 * we will compute the hash based on this value ctx.val.
477 */
Bhaskar98634f02013-10-29 23:30:51 -0400478 hash = gen_hash(px, smp.data.str.str, len);
479
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500480 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100481 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200482 hash_done:
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200483 if (px->lbprm.algo & BE_LB_LKUP_CHTREE)
484 return chash_get_server_hash(px, hash);
485 else
486 return map_get_server_hash(px, hash);
Emeric Brun736aa232009-06-30 17:56:00 +0200487}
Benoitaffb4812009-03-25 13:02:10 +0100488
489/*
Willy Tarreau7c669d72008-06-20 15:04:11 +0200490 * This function applies the load-balancing algorithm to the session, as
491 * defined by the backend it is assigned to. The session is then marked as
492 * 'assigned'.
493 *
494 * This function MAY NOT be called with SN_ASSIGNED already set. If the session
495 * had a server previously assigned, it is rebalanced, trying to avoid the same
Willy Tarreau827aee92011-03-10 16:55:02 +0100496 * server, which should still be present in target_srv(&s->target) before the call.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200497 * The function tries to keep the original connection slot if it reconnects to
498 * the same server, otherwise it releases it and tries to offer it.
499 *
500 * It is illegal to call this function with a session in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200501 *
502 * It may return :
Willy Tarreau664beb82011-03-10 11:38:29 +0100503 * SRV_STATUS_OK if everything is OK. ->srv and ->target are assigned.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200504 * SRV_STATUS_NOSRV if no server is available. Session is not ASSIGNED
505 * SRV_STATUS_FULL if all servers are saturated. Session is not ASSIGNED
Willy Tarreaubaaee002006-06-26 02:48:02 +0200506 * SRV_STATUS_INTERNAL for other unrecoverable errors.
507 *
Willy Tarreau7c669d72008-06-20 15:04:11 +0200508 * Upon successful return, the session flag SN_ASSIGNED is set to indicate that
Willy Tarreau827aee92011-03-10 16:55:02 +0100509 * it does not need to be called anymore. This means that target_srv(&s->target)
510 * can be trusted in balance and direct modes.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200511 *
512 */
513
514int assign_server(struct session *s)
515{
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200516 struct connection *conn;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200517 struct server *conn_slot;
Willy Tarreau827aee92011-03-10 16:55:02 +0100518 struct server *srv, *prev_srv;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200519 int err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100520
Simon Horman8effd3d2011-08-13 08:03:52 +0900521 DPRINTF(stderr,"assign_server : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200522
Willy Tarreau7c669d72008-06-20 15:04:11 +0200523 err = SRV_STATUS_INTERNAL;
524 if (unlikely(s->pend_pos || s->flags & SN_ASSIGNED))
525 goto out_err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100526
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100527 prev_srv = objt_server(s->target);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200528 conn_slot = s->srv_conn;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200529
Willy Tarreau7c669d72008-06-20 15:04:11 +0200530 /* We have to release any connection slot before applying any LB algo,
531 * otherwise we may erroneously end up with no available slot.
532 */
533 if (conn_slot)
534 sess_change_server(s, NULL);
535
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100536 /* We will now try to find the good server and store it into <objt_server(s->target)>.
537 * Note that <objt_server(s->target)> may be NULL in case of dispatch or proxy mode,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200538 * as well as if no server is available (check error code).
539 */
Willy Tarreau1a20a5d2007-11-01 21:08:19 +0100540
Willy Tarreau827aee92011-03-10 16:55:02 +0100541 srv = NULL;
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100542 s->target = NULL;
Willy Tarreau9420b122013-12-15 18:58:25 +0100543 conn = objt_conn(s->req->cons->end);
Willy Tarreau664beb82011-03-10 11:38:29 +0100544
Willy Tarreau068621e2013-12-23 15:11:25 +0100545 if (conn &&
Willy Tarreau2481d162014-02-19 18:40:43 +0100546 (conn->flags & CO_FL_CONNECTED) &&
Willy Tarreau9420b122013-12-15 18:58:25 +0100547 objt_server(conn->target) && __objt_server(conn->target)->proxy == s->be &&
Willy Tarreauc35362a2014-04-25 13:58:37 +0200548 ((s->txn.flags & TX_PREFER_LAST) ||
549 ((s->be->options & PR_O_PREF_LAST) &&
550 (!s->be->max_ka_queue ||
551 server_has_room(__objt_server(conn->target)) ||
552 (__objt_server(conn->target)->nbpend + 1) < s->be->max_ka_queue))) &&
Willy Tarreau87eb1d62014-05-13 18:51:40 +0200553 srv_is_usable(__objt_server(conn->target))) {
Willy Tarreau9420b122013-12-15 18:58:25 +0100554 /* This session was relying on a server in a previous request
555 * and the proxy has "option prefer-current-server" set, so
556 * let's try to reuse the same server.
557 */
558 srv = __objt_server(conn->target);
559 s->target = &srv->obj_type;
560 }
561 else if (s->be->lbprm.algo & BE_LB_KIND) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200562 /* we must check if we have at least one server available */
563 if (!s->be->lbprm.tot_weight) {
564 err = SRV_STATUS_NOSRV;
565 goto out;
566 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200567
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200568 /* First check whether we need to fetch some data or simply call
569 * the LB lookup function. Only the hashing functions will need
570 * some input data in fact, and will support multiple algorithms.
571 */
572 switch (s->be->lbprm.algo & BE_LB_LKUP) {
573 case BE_LB_LKUP_RRTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100574 srv = fwrr_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200575 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200576
Willy Tarreauf09c6602012-02-13 17:12:08 +0100577 case BE_LB_LKUP_FSTREE:
578 srv = fas_get_next_server(s->be, prev_srv);
579 break;
580
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200581 case BE_LB_LKUP_LCTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100582 srv = fwlc_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200583 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200584
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200585 case BE_LB_LKUP_CHTREE:
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200586 case BE_LB_LKUP_MAP:
Willy Tarreau9757a382009-10-03 12:56:50 +0200587 if ((s->be->lbprm.algo & BE_LB_KIND) == BE_LB_KIND_RR) {
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200588 if (s->be->lbprm.algo & BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100589 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200590 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100591 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau9757a382009-10-03 12:56:50 +0200592 break;
593 }
594 else if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200595 /* unknown balancing algorithm */
Willy Tarreau7c669d72008-06-20 15:04:11 +0200596 err = SRV_STATUS_INTERNAL;
597 goto out;
598 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200599
600 switch (s->be->lbprm.algo & BE_LB_PARM) {
601 case BE_LB_HASH_SRC:
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200602 conn = objt_conn(s->req->prod->end);
603 if (conn && conn->addr.from.ss_family == AF_INET) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200604 srv = get_server_sh(s->be,
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200605 (void *)&((struct sockaddr_in *)&conn->addr.from)->sin_addr,
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200606 4);
607 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200608 else if (conn && conn->addr.from.ss_family == AF_INET6) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200609 srv = get_server_sh(s->be,
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200610 (void *)&((struct sockaddr_in6 *)&conn->addr.from)->sin6_addr,
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200611 16);
612 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200613 else {
614 /* unknown IP family */
615 err = SRV_STATUS_INTERNAL;
616 goto out;
617 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200618 break;
619
620 case BE_LB_HASH_URI:
621 /* URI hashing */
Willy Tarreaueaed5a12010-03-24 14:54:30 +0100622 if (s->txn.req.msg_state < HTTP_MSG_BODY)
623 break;
Willy Tarreau827aee92011-03-10 16:55:02 +0100624 srv = get_server_uh(s->be,
Willy Tarreauda6eed62014-04-17 20:24:24 +0200625 b_ptr(s->req->buf, -http_uri_rewind(&s->txn.req)),
Willy Tarreau827aee92011-03-10 16:55:02 +0100626 s->txn.req.sl.rq.u_l);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200627 break;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200628
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200629 case BE_LB_HASH_PRM:
630 /* URL Parameter hashing */
Willy Tarreaueaed5a12010-03-24 14:54:30 +0100631 if (s->txn.req.msg_state < HTTP_MSG_BODY)
632 break;
Willy Tarreau61a21a32011-03-01 20:35:49 +0100633
Willy Tarreau827aee92011-03-10 16:55:02 +0100634 srv = get_server_ph(s->be,
Willy Tarreauda6eed62014-04-17 20:24:24 +0200635 b_ptr(s->req->buf, -http_uri_rewind(&s->txn.req)),
Willy Tarreau827aee92011-03-10 16:55:02 +0100636 s->txn.req.sl.rq.u_l);
Willy Tarreau61a21a32011-03-01 20:35:49 +0100637
Willy Tarreau827aee92011-03-10 16:55:02 +0100638 if (!srv && s->txn.meth == HTTP_METH_POST)
639 srv = get_server_ph_post(s);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200640 break;
Benoitaffb4812009-03-25 13:02:10 +0100641
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200642 case BE_LB_HASH_HDR:
643 /* Header Parameter hashing */
Willy Tarreaueaed5a12010-03-24 14:54:30 +0100644 if (s->txn.req.msg_state < HTTP_MSG_BODY)
645 break;
Willy Tarreau827aee92011-03-10 16:55:02 +0100646 srv = get_server_hh(s);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200647 break;
648
649 case BE_LB_HASH_RDP:
650 /* RDP Cookie hashing */
Willy Tarreau827aee92011-03-10 16:55:02 +0100651 srv = get_server_rch(s);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200652 break;
653
654 default:
655 /* unknown balancing algorithm */
656 err = SRV_STATUS_INTERNAL;
657 goto out;
Benoitaffb4812009-03-25 13:02:10 +0100658 }
Emeric Brun736aa232009-06-30 17:56:00 +0200659
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200660 /* If the hashing parameter was not found, let's fall
661 * back to round robin on the map.
662 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100663 if (!srv) {
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200664 if (s->be->lbprm.algo & BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100665 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200666 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100667 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200668 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200669
670 /* end of map-based LB */
Emeric Brun736aa232009-06-30 17:56:00 +0200671 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200672
Willy Tarreau7c669d72008-06-20 15:04:11 +0200673 default:
674 /* unknown balancing algorithm */
675 err = SRV_STATUS_INTERNAL;
676 goto out;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200677 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200678
Willy Tarreau827aee92011-03-10 16:55:02 +0100679 if (!srv) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200680 err = SRV_STATUS_FULL;
681 goto out;
682 }
Willy Tarreau827aee92011-03-10 16:55:02 +0100683 else if (srv != prev_srv) {
Willy Tarreau7d0aaf32011-03-10 23:25:56 +0100684 s->be->be_counters.cum_lbconn++;
Willy Tarreau827aee92011-03-10 16:55:02 +0100685 srv->counters.cum_lbconn++;
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100686 }
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100687 s->target = &srv->obj_type;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200688 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200689 else if (s->be->options & (PR_O_DISPATCH | PR_O_TRANSP)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100690 s->target = &s->be->obj_type;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200691 }
David du Colombier6f5ccb12011-03-10 22:26:24 +0100692 else if ((s->be->options & PR_O_HTTP_PROXY) &&
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200693 (conn = objt_conn(s->req->cons->end)) &&
694 is_addr(&conn->addr.to)) {
Willy Tarreau664beb82011-03-10 11:38:29 +0100695 /* in proxy mode, we need a valid destination address */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100696 s->target = &s->be->obj_type;
Willy Tarreau664beb82011-03-10 11:38:29 +0100697 }
698 else {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200699 err = SRV_STATUS_NOSRV;
700 goto out;
701 }
702
703 s->flags |= SN_ASSIGNED;
704 err = SRV_STATUS_OK;
705 out:
706
707 /* Either we take back our connection slot, or we offer it to someone
708 * else if we don't need it anymore.
709 */
710 if (conn_slot) {
Willy Tarreau827aee92011-03-10 16:55:02 +0100711 if (conn_slot == srv) {
712 sess_change_server(s, srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200713 } else {
714 if (may_dequeue_tasks(conn_slot, s->be))
715 process_srv_queue(conn_slot);
716 }
717 }
718
719 out_err:
720 return err;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200721}
722
723
724/*
725 * This function assigns a server address to a session, and sets SN_ADDR_SET.
726 * The address is taken from the currently assigned server, or from the
727 * dispatch or transparent address.
728 *
729 * It may return :
730 * SRV_STATUS_OK if everything is OK.
731 * SRV_STATUS_INTERNAL for other unrecoverable errors.
732 *
733 * Upon successful return, the session flag SN_ADDR_SET is set. This flag is
734 * not cleared, so it's to the caller to clear it if required.
735 *
Willy Tarreau32e3c6a2013-10-11 19:34:20 +0200736 * The caller is responsible for having already assigned a connection
737 * to si->end.
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200738 *
Willy Tarreaubaaee002006-06-26 02:48:02 +0200739 */
740int assign_server_address(struct session *s)
741{
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200742 struct connection *cli_conn = objt_conn(s->req->prod->end);
Willy Tarreau32e3c6a2013-10-11 19:34:20 +0200743 struct connection *srv_conn = objt_conn(s->req->cons->end);
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200744
Willy Tarreaubaaee002006-06-26 02:48:02 +0200745#ifdef DEBUG_FULL
746 fprintf(stderr,"assign_server_address : s=%p\n",s);
747#endif
748
Willy Tarreauf3e49f92009-10-03 12:21:20 +0200749 if ((s->flags & SN_DIRECT) || (s->be->lbprm.algo & BE_LB_KIND)) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200750 /* A server is necessarily known for this session */
751 if (!(s->flags & SN_ASSIGNED))
752 return SRV_STATUS_INTERNAL;
753
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200754 srv_conn->addr.to = objt_server(s->target)->addr;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200755
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200756 if (!is_addr(&srv_conn->addr.to) && cli_conn) {
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200757 /* if the server has no address, we use the same address
758 * the client asked, which is handy for remapping ports
Willy Tarreau9cf8d3f2014-05-09 22:56:10 +0200759 * locally on multiple addresses at once. Nothing is done
760 * for AF_UNIX addresses.
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200761 */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200762 conn_get_to_addr(cli_conn);
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200763
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200764 if (cli_conn->addr.to.ss_family == AF_INET) {
765 ((struct sockaddr_in *)&srv_conn->addr.to)->sin_addr = ((struct sockaddr_in *)&cli_conn->addr.to)->sin_addr;
766 } else if (cli_conn->addr.to.ss_family == AF_INET6) {
767 ((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 +0200768 }
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200769 }
770
Willy Tarreaubaaee002006-06-26 02:48:02 +0200771 /* if this server remaps proxied ports, we'll use
772 * the port the client connected to with an offset. */
Willy Tarreauc93cd162014-05-13 15:54:22 +0200773 if ((objt_server(s->target)->flags & SRV_F_MAPPORTS) && cli_conn) {
David du Colombier6f5ccb12011-03-10 22:26:24 +0100774 int base_port;
775
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200776 conn_get_to_addr(cli_conn);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100777
778 /* First, retrieve the port from the incoming connection */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200779 base_port = get_host_port(&cli_conn->addr.to);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100780
781 /* Second, assign the outgoing connection's port */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200782 base_port += get_host_port(&srv_conn->addr.to);
783 set_host_port(&srv_conn->addr.to, base_port);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200784 }
785 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200786 else if (s->be->options & PR_O_DISPATCH) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200787 /* connect to the defined dispatch addr */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200788 srv_conn->addr.to = s->be->dispatch_addr;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200789 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200790 else if ((s->be->options & PR_O_TRANSP) && cli_conn) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200791 /* in transparent mode, use the original dest addr if no dispatch specified */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200792 conn_get_to_addr(cli_conn);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200793
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200794 if (cli_conn->addr.to.ss_family == AF_INET || cli_conn->addr.to.ss_family == AF_INET6)
795 srv_conn->addr.to = cli_conn->addr.to;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200796 }
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100797 else if (s->be->options & PR_O_HTTP_PROXY) {
798 /* If HTTP PROXY option is set, then server is already assigned
799 * during incoming client request parsing. */
800 }
Willy Tarreau1a1158b2007-01-20 11:07:46 +0100801 else {
802 /* no server and no LB algorithm ! */
803 return SRV_STATUS_INTERNAL;
804 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200805
806 s->flags |= SN_ADDR_SET;
807 return SRV_STATUS_OK;
808}
809
810
811/* This function assigns a server to session <s> if required, and can add the
812 * connection to either the assigned server's queue or to the proxy's queue.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200813 * If ->srv_conn is set, the session is first released from the server.
814 * It may also be called with SN_DIRECT and/or SN_ASSIGNED though. It will
815 * be called before any connection and after any retry or redispatch occurs.
816 *
817 * It is not allowed to call this function with a session in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200818 *
819 * Returns :
820 *
821 * SRV_STATUS_OK if everything is OK.
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100822 * SRV_STATUS_NOSRV if no server is available. objt_server(s->target) = NULL.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200823 * SRV_STATUS_QUEUED if the connection has been queued.
824 * SRV_STATUS_FULL if the server(s) is/are saturated and the
Willy Tarreau827aee92011-03-10 16:55:02 +0100825 * connection could not be queued at the server's,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200826 * which may be NULL if we queue on the backend.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200827 * SRV_STATUS_INTERNAL for other unrecoverable errors.
828 *
829 */
830int assign_server_and_queue(struct session *s)
831{
832 struct pendconn *p;
Willy Tarreau827aee92011-03-10 16:55:02 +0100833 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200834 int err;
835
836 if (s->pend_pos)
837 return SRV_STATUS_INTERNAL;
838
Willy Tarreau7c669d72008-06-20 15:04:11 +0200839 err = SRV_STATUS_OK;
840 if (!(s->flags & SN_ASSIGNED)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100841 struct server *prev_srv = objt_server(s->target);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100842
Willy Tarreau7c669d72008-06-20 15:04:11 +0200843 err = assign_server(s);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100844 if (prev_srv) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200845 /* This session was previously assigned to a server. We have to
846 * update the session's and the server's stats :
847 * - if the server changed :
848 * - set TX_CK_DOWN if txn.flags was TX_CK_VALID
849 * - set SN_REDISP if it was successfully redispatched
850 * - increment srv->redispatches and be->redispatches
851 * - if the server remained the same : update retries.
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100852 */
853
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100854 if (prev_srv != objt_server(s->target)) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200855 if ((s->txn.flags & TX_CK_MASK) == TX_CK_VALID) {
856 s->txn.flags &= ~TX_CK_MASK;
857 s->txn.flags |= TX_CK_DOWN;
858 }
859 s->flags |= SN_REDISP;
Willy Tarreau3d80d912011-03-10 11:42:13 +0100860 prev_srv->counters.redispatches++;
Willy Tarreau7d0aaf32011-03-10 23:25:56 +0100861 s->be->be_counters.redispatches++;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200862 } else {
Willy Tarreau3d80d912011-03-10 11:42:13 +0100863 prev_srv->counters.retries++;
Willy Tarreau7d0aaf32011-03-10 23:25:56 +0100864 s->be->be_counters.retries++;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100865 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100866 }
867 }
868
Willy Tarreaubaaee002006-06-26 02:48:02 +0200869 switch (err) {
870 case SRV_STATUS_OK:
Willy Tarreau7c669d72008-06-20 15:04:11 +0200871 /* we have SN_ASSIGNED set */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100872 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +0100873 if (!srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200874 return SRV_STATUS_OK; /* dispatch or proxy mode */
875
876 /* If we already have a connection slot, no need to check any queue */
Willy Tarreau827aee92011-03-10 16:55:02 +0100877 if (s->srv_conn == srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200878 return SRV_STATUS_OK;
879
880 /* OK, this session already has an assigned server, but no
881 * connection slot yet. Either it is a redispatch, or it was
882 * assigned from persistence information (direct mode).
883 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100884 if ((s->flags & SN_REDIRECTABLE) && srv->rdr_len) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200885 /* server scheduled for redirection, and already assigned. We
886 * don't want to go further nor check the queue.
Willy Tarreau21d2af32008-02-14 20:25:24 +0100887 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100888 sess_change_server(s, srv); /* not really needed in fact */
Willy Tarreau21d2af32008-02-14 20:25:24 +0100889 return SRV_STATUS_OK;
890 }
891
Willy Tarreau7c669d72008-06-20 15:04:11 +0200892 /* We might have to queue this session if the assigned server is full.
893 * We know we have to queue it into the server's queue, so if a maxqueue
894 * is set on the server, we must also check that the server's queue is
895 * not full, in which case we have to return FULL.
896 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100897 if (srv->maxconn &&
898 (srv->nbpend || srv->served >= srv_dynamic_maxconn(srv))) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200899
Willy Tarreau827aee92011-03-10 16:55:02 +0100900 if (srv->maxqueue > 0 && srv->nbpend >= srv->maxqueue)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200901 return SRV_STATUS_FULL;
902
Willy Tarreaubaaee002006-06-26 02:48:02 +0200903 p = pendconn_add(s);
904 if (p)
905 return SRV_STATUS_QUEUED;
906 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200907 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200908 }
Willy Tarreau7c669d72008-06-20 15:04:11 +0200909
910 /* OK, we can use this server. Let's reserve our place */
Willy Tarreau827aee92011-03-10 16:55:02 +0100911 sess_change_server(s, srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200912 return SRV_STATUS_OK;
913
914 case SRV_STATUS_FULL:
915 /* queue this session into the proxy's queue */
916 p = pendconn_add(s);
917 if (p)
918 return SRV_STATUS_QUEUED;
919 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200920 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200921
922 case SRV_STATUS_NOSRV:
Willy Tarreau7c669d72008-06-20 15:04:11 +0200923 return err;
924
Willy Tarreaubaaee002006-06-26 02:48:02 +0200925 case SRV_STATUS_INTERNAL:
926 return err;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200927
Willy Tarreaubaaee002006-06-26 02:48:02 +0200928 default:
929 return SRV_STATUS_INTERNAL;
930 }
Willy Tarreau5b6995c2008-01-13 16:31:17 +0100931}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200932
Willy Tarreaub1d67742010-03-29 19:36:59 +0200933/* If an explicit source binding is specified on the server and/or backend, and
934 * this source makes use of the transparent proxy, then it is extracted now and
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200935 * assigned to the session's pending connection. This function assumes that an
Willy Tarreau32e3c6a2013-10-11 19:34:20 +0200936 * outgoing connection has already been assigned to s->req->cons->end.
Willy Tarreaub1d67742010-03-29 19:36:59 +0200937 */
938static void assign_tproxy_address(struct session *s)
939{
Pieter Baauwd551fb52013-05-08 22:49:23 +0200940#if defined(CONFIG_HAP_CTTPROXY) || defined(CONFIG_HAP_TRANSPARENT)
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100941 struct server *srv = objt_server(s->target);
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100942 struct conn_src *src;
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200943 struct connection *cli_conn;
Willy Tarreau32e3c6a2013-10-11 19:34:20 +0200944 struct connection *srv_conn = objt_conn(s->req->cons->end);
Willy Tarreau827aee92011-03-10 16:55:02 +0100945
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100946 if (srv && srv->conn_src.opts & CO_SRC_BIND)
947 src = &srv->conn_src;
948 else if (s->be->conn_src.opts & CO_SRC_BIND)
949 src = &s->be->conn_src;
950 else
951 return;
Willy Tarreau294c4732011-12-16 21:35:50 +0100952
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100953 switch (src->opts & CO_SRC_TPROXY_MASK) {
954 case CO_SRC_TPROXY_ADDR:
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200955 srv_conn->addr.from = src->tproxy_addr;
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100956 break;
957 case CO_SRC_TPROXY_CLI:
958 case CO_SRC_TPROXY_CIP:
959 /* FIXME: what can we do if the client connects in IPv6 or unix socket ? */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200960 cli_conn = objt_conn(s->req->prod->end);
961 if (cli_conn)
962 srv_conn->addr.from = cli_conn->addr.from;
963 else
964 memset(&srv_conn->addr.from, 0, sizeof(srv_conn->addr.from));
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100965 break;
966 case CO_SRC_TPROXY_DYN:
967 if (src->bind_hdr_occ) {
968 char *vptr;
969 int vlen;
970 int rewind;
Willy Tarreau294c4732011-12-16 21:35:50 +0100971
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100972 /* bind to the IP in a header */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200973 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_family = AF_INET;
974 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_port = 0;
975 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_addr.s_addr = 0;
Willy Tarreau294c4732011-12-16 21:35:50 +0100976
Willy Tarreau211cdec2014-04-17 20:18:08 +0200977 b_rew(s->req->buf, rewind = http_hdr_rewind(&s->txn.req));
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100978 if (http_get_hdr(&s->txn.req, src->bind_hdr_name, src->bind_hdr_len,
979 &s->txn.hdr_idx, src->bind_hdr_occ, NULL, &vptr, &vlen)) {
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200980 ((struct sockaddr_in *)&srv_conn->addr.from)->sin_addr.s_addr =
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100981 htonl(inetaddr_host_lim(vptr, vptr + vlen));
Willy Tarreaubce70882009-09-07 11:51:47 +0200982 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100983 b_adv(s->req->buf, rewind);
Willy Tarreaub1d67742010-03-29 19:36:59 +0200984 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +0100985 break;
986 default:
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200987 memset(&srv_conn->addr.from, 0, sizeof(srv_conn->addr.from));
Willy Tarreaub1d67742010-03-29 19:36:59 +0200988 }
989#endif
990}
991
992
Willy Tarreaubaaee002006-06-26 02:48:02 +0200993/*
994 * This function initiates a connection to the server assigned to this session
Willy Tarreau6471afb2011-09-23 10:54:59 +0200995 * (s->target, s->req->cons->addr.to). It will assign a server if none
Willy Tarreau664beb82011-03-10 11:38:29 +0100996 * is assigned yet.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200997 * It can return one of :
998 * - SN_ERR_NONE if everything's OK
999 * - SN_ERR_SRVTO if there are no more servers
1000 * - SN_ERR_SRVCL if the connection was refused by the server
1001 * - SN_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
1002 * - SN_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
1003 * - SN_ERR_INTERNAL for any other purely internal errors
1004 * Additionnally, in the case of SN_ERR_RESOURCE, an emergency log will be emitted.
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001005 * The server-facing stream interface is expected to hold a pre-allocated connection
1006 * in s->req->cons->conn.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001007 */
1008int connect_server(struct session *s)
1009{
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001010 struct connection *cli_conn;
Willy Tarreau34601a82013-12-15 16:33:46 +01001011 struct connection *srv_conn;
Willy Tarreau827aee92011-03-10 16:55:02 +01001012 struct server *srv;
Willy Tarreau34601a82013-12-15 16:33:46 +01001013 int reuse = 0;
Willy Tarreau9650f372009-08-16 14:02:45 +02001014 int err;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001015
Willy Tarreau34601a82013-12-15 16:33:46 +01001016 srv_conn = objt_conn(s->req->cons->end);
1017 if (srv_conn)
1018 reuse = s->target == srv_conn->target;
1019
1020 if (reuse) {
1021 /* Disable connection reuse if a dynamic source is used.
1022 * As long as we don't share connections between servers,
1023 * we don't need to disable connection reuse on no-idempotent
1024 * requests nor when PROXY protocol is used.
1025 */
1026 srv = objt_server(s->target);
1027 if (srv && srv->conn_src.opts & CO_SRC_BIND) {
1028 if ((srv->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1029 reuse = 0;
1030 }
1031 else if (s->be->conn_src.opts & CO_SRC_BIND) {
1032 if ((s->be->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1033 reuse = 0;
1034 }
1035 }
1036
1037 srv_conn = si_alloc_conn(s->req->cons, reuse);
Willy Tarreau32e3c6a2013-10-11 19:34:20 +02001038 if (!srv_conn)
1039 return SN_ERR_RESOURCE;
1040
Willy Tarreaubaaee002006-06-26 02:48:02 +02001041 if (!(s->flags & SN_ADDR_SET)) {
1042 err = assign_server_address(s);
1043 if (err != SRV_STATUS_OK)
1044 return SN_ERR_INTERNAL;
1045 }
1046
Willy Tarreauff605db2013-12-20 11:09:51 +01001047 if (!conn_xprt_ready(srv_conn)) {
1048 /* the target was only on the session, assign it to the SI now */
1049 srv_conn->target = s->target;
Willy Tarreaud88edf22009-06-14 15:48:17 +02001050
Willy Tarreauff605db2013-12-20 11:09:51 +01001051 /* set the correct protocol on the output stream interface */
1052 if (objt_server(s->target)) {
1053 conn_prepare(srv_conn, objt_server(s->target)->proto, objt_server(s->target)->xprt);
1054 }
1055 else if (obj_type(s->target) == OBJ_TYPE_PROXY) {
1056 /* proxies exclusively run on raw_sock right now */
1057 conn_prepare(srv_conn, protocol_by_family(srv_conn->addr.to.ss_family), &raw_sock);
1058 if (!objt_conn(s->req->cons->end) || !objt_conn(s->req->cons->end)->ctrl)
1059 return SN_ERR_INTERNAL;
1060 }
1061 else
1062 return SN_ERR_INTERNAL; /* how did we get there ? */
Willy Tarreaud02394b2012-05-11 18:32:18 +02001063
Willy Tarreauff605db2013-12-20 11:09:51 +01001064 /* process the case where the server requires the PROXY protocol to be sent */
1065 srv_conn->send_proxy_ofs = 0;
David Safb76832014-05-08 23:42:08 -04001066 if (objt_server(s->target) && objt_server(s->target)->pp_opts) {
Willy Tarreauff605db2013-12-20 11:09:51 +01001067 srv_conn->send_proxy_ofs = 1; /* must compute size */
1068 cli_conn = objt_conn(s->req->prod->end);
1069 if (cli_conn)
1070 conn_get_to_addr(cli_conn);
1071 }
Willy Tarreau2a6e8802013-10-24 15:50:53 +02001072
Willy Tarreauff605db2013-12-20 11:09:51 +01001073 si_attach_conn(s->req->cons, srv_conn);
Willy Tarreau26d8c592012-05-07 18:12:14 +02001074
Willy Tarreauff605db2013-12-20 11:09:51 +01001075 assign_tproxy_address(s);
1076 }
1077 else {
1078 /* the connection is being reused, just re-attach it */
1079 si_attach_conn(s->req->cons, srv_conn);
Willy Tarreau36346242014-02-24 18:26:30 +01001080 s->flags |= SN_SRV_REUSED;
Willy Tarreauff605db2013-12-20 11:09:51 +01001081 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001082
William Lallemandb7ff6a32012-03-02 14:35:21 +01001083 /* flag for logging source ip/port */
1084 if (s->fe->options2 & PR_O2_SRC_ADDR)
1085 s->req->cons->flags |= SI_FL_SRC_ADDR;
1086
Willy Tarreau14f8e862012-08-30 22:23:13 +02001087 /* disable lingering */
1088 if (s->be->options & PR_O_TCP_NOLING)
1089 s->req->cons->flags |= SI_FL_NOLINGER;
1090
Willy Tarreau73b013b2012-05-21 16:31:45 +02001091 err = si_connect(s->req->cons);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001092
Willy Tarreau9650f372009-08-16 14:02:45 +02001093 if (err != SN_ERR_NONE)
1094 return err;
Willy Tarreau788e2842008-08-26 13:25:39 +02001095
Willy Tarreau14f8e862012-08-30 22:23:13 +02001096 /* set connect timeout */
1097 s->req->cons->exp = tick_add_ifset(now_ms, s->be->timeout.connect);
1098
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001099 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +01001100 if (srv) {
Willy Tarreau1e62de62008-11-11 20:20:02 +01001101 s->flags |= SN_CURR_SESS;
Willy Tarreau827aee92011-03-10 16:55:02 +01001102 srv->cur_sess++;
1103 if (srv->cur_sess > srv->counters.cur_sess_max)
1104 srv->counters.cur_sess_max = srv->cur_sess;
Willy Tarreau51406232008-03-10 22:04:20 +01001105 if (s->be->lbprm.server_take_conn)
Willy Tarreau827aee92011-03-10 16:55:02 +01001106 s->be->lbprm.server_take_conn(srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001107 }
1108
Willy Tarreaubaaee002006-06-26 02:48:02 +02001109 return SN_ERR_NONE; /* connection is OK */
1110}
1111
1112
Willy Tarreaubaaee002006-06-26 02:48:02 +02001113/* This function performs the "redispatch" part of a connection attempt. It
1114 * will assign a server if required, queue the connection if required, and
1115 * handle errors that might arise at this level. It can change the server
1116 * state. It will return 1 if it encounters an error, switches the server
1117 * state, or has to queue a connection. Otherwise, it will return 0 indicating
1118 * that the connection is ready to use.
1119 */
1120
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001121int srv_redispatch_connect(struct session *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001122{
Willy Tarreau827aee92011-03-10 16:55:02 +01001123 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001124 int conn_err;
1125
1126 /* We know that we don't have any connection pending, so we will
1127 * try to get a new one, and wait in this state if it's queued
1128 */
Willy Tarreau7c669d72008-06-20 15:04:11 +02001129 redispatch:
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001130 conn_err = assign_server_and_queue(s);
1131 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +01001132
Willy Tarreaubaaee002006-06-26 02:48:02 +02001133 switch (conn_err) {
1134 case SRV_STATUS_OK:
1135 break;
1136
Willy Tarreau7c669d72008-06-20 15:04:11 +02001137 case SRV_STATUS_FULL:
1138 /* The server has reached its maxqueue limit. Either PR_O_REDISP is set
1139 * and we can redispatch to another server, or it is not and we return
1140 * 503. This only makes sense in DIRECT mode however, because normal LB
1141 * algorithms would never select such a server, and hash algorithms
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001142 * would bring us on the same server again. Note that s->target is set
Willy Tarreau827aee92011-03-10 16:55:02 +01001143 * in this case.
Willy Tarreau7c669d72008-06-20 15:04:11 +02001144 */
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001145 if (((s->flags & (SN_DIRECT|SN_FORCE_PRST)) == SN_DIRECT) &&
1146 (s->be->options & PR_O_REDISP)) {
1147 s->flags &= ~(SN_DIRECT | SN_ASSIGNED | SN_ADDR_SET);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001148 goto redispatch;
1149 }
1150
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001151 if (!s->req->cons->err_type) {
1152 s->req->cons->err_type = SI_ET_QUEUE_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001153 }
Willy Tarreau7c669d72008-06-20 15:04:11 +02001154
Willy Tarreau827aee92011-03-10 16:55:02 +01001155 srv->counters.failed_conns++;
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001156 s->be->be_counters.failed_conns++;
Willy Tarreau7c669d72008-06-20 15:04:11 +02001157 return 1;
1158
Willy Tarreaubaaee002006-06-26 02:48:02 +02001159 case SRV_STATUS_NOSRV:
Willy Tarreau827aee92011-03-10 16:55:02 +01001160 /* note: it is guaranteed that srv == NULL here */
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001161 if (!s->req->cons->err_type) {
1162 s->req->cons->err_type = SI_ET_CONN_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001163 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +01001164
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001165 s->be->be_counters.failed_conns++;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001166 return 1;
1167
1168 case SRV_STATUS_QUEUED:
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001169 s->req->cons->exp = tick_add_ifset(now_ms, s->be->timeout.queue);
1170 s->req->cons->state = SI_ST_QUE;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001171 /* do nothing else and do not wake any other session up */
1172 return 1;
1173
Willy Tarreaubaaee002006-06-26 02:48:02 +02001174 case SRV_STATUS_INTERNAL:
1175 default:
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001176 if (!s->req->cons->err_type) {
1177 s->req->cons->err_type = SI_ET_CONN_OTHER;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001178 }
1179
Willy Tarreau827aee92011-03-10 16:55:02 +01001180 if (srv)
1181 srv_inc_sess_ctr(srv);
1182 if (srv)
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -05001183 srv_set_sess_last(srv);
1184 if (srv)
Willy Tarreau827aee92011-03-10 16:55:02 +01001185 srv->counters.failed_conns++;
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001186 s->be->be_counters.failed_conns++;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001187
1188 /* release other sessions waiting for this server */
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001189 if (may_dequeue_tasks(srv, s->be))
Willy Tarreau827aee92011-03-10 16:55:02 +01001190 process_srv_queue(srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001191 return 1;
1192 }
1193 /* if we get here, it's because we got SRV_STATUS_OK, which also
1194 * means that the connection has not been queued.
1195 */
1196 return 0;
1197}
1198
Willy Tarreau4aac7db2014-05-16 11:48:10 +02001199/* sends a log message when a backend goes down, and also sets last
1200 * change date.
1201 */
1202void set_backend_down(struct proxy *be)
1203{
1204 be->last_change = now.tv_sec;
1205 be->down_trans++;
1206
1207 Alert("%s '%s' has no server available!\n", proxy_type_str(be), be->id);
1208 send_log(be, LOG_EMERG, "%s %s has no server available!\n", proxy_type_str(be), be->id);
1209}
1210
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001211/* Apply RDP cookie persistence to the current session. For this, the function
1212 * tries to extract an RDP cookie from the request buffer, and look for the
1213 * matching server in the list. If the server is found, it is assigned to the
1214 * session. This always returns 1, and the analyser removes itself from the
1215 * list. Nothing is performed if a server was already assigned.
1216 */
Willy Tarreau7421efb2012-07-02 15:11:27 +02001217int tcp_persist_rdp_cookie(struct session *s, struct channel *req, int an_bit)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001218{
1219 struct proxy *px = s->be;
1220 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +02001221 struct sample smp;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001222 struct server *srv = px->srv;
1223 struct sockaddr_in addr;
1224 char *p;
1225
Willy Tarreau02d6cfc2012-03-01 18:19:58 +01001226 DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bh=%d analysers=%02x\n",
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001227 now_ms, __FUNCTION__,
1228 s,
1229 req,
1230 req->rex, req->wex,
1231 req->flags,
Willy Tarreau9b28e032012-10-12 23:49:43 +02001232 req->buf->i,
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001233 req->analysers);
1234
1235 if (s->flags & SN_ASSIGNED)
1236 goto no_cookie;
1237
Willy Tarreau37406352012-04-23 16:16:37 +02001238 memset(&smp, 0, sizeof(smp));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001239
Willy Tarreaucadd8c92013-07-22 18:09:52 +02001240 ret = fetch_rdp_cookie_name(s, &smp, s->be->rdp_cookie_name, s->be->rdp_cookie_len);
Willy Tarreauf853c462012-04-23 18:53:56 +02001241 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || smp.data.str.len == 0)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001242 goto no_cookie;
1243
1244 memset(&addr, 0, sizeof(addr));
1245 addr.sin_family = AF_INET;
1246
Willy Tarreau664092c2011-12-16 19:11:42 +01001247 /* Considering an rdp cookie detected using acl, str ended with <cr><lf> and should return */
Willy Tarreauf853c462012-04-23 18:53:56 +02001248 addr.sin_addr.s_addr = strtoul(smp.data.str.str, &p, 10);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001249 if (*p != '.')
1250 goto no_cookie;
1251 p++;
1252 addr.sin_port = (unsigned short)strtoul(p, &p, 10);
1253 if (*p != '.')
1254 goto no_cookie;
1255
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001256 s->target = NULL;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001257 while (srv) {
Willy Tarreau28e9d062014-05-09 22:47:50 +02001258 if (srv->addr.ss_family == AF_INET &&
1259 memcmp(&addr, &(srv->addr), sizeof(addr)) == 0) {
Willy Tarreau892337c2014-05-13 23:41:20 +02001260 if ((srv->state != SRV_ST_STOPPED) || (px->options & PR_O_PERSIST)) {
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001261 /* we found the server and it is usable */
1262 s->flags |= SN_DIRECT | SN_ASSIGNED;
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001263 s->target = &srv->obj_type;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02001264 break;
1265 }
1266 }
1267 srv = srv->next;
1268 }
1269
1270no_cookie:
1271 req->analysers &= ~an_bit;
1272 req->analyse_exp = TICK_ETERNITY;
1273 return 1;
1274}
1275
Krzysztof Oledzki85130942007-10-22 16:21:10 +02001276int be_downtime(struct proxy *px) {
Willy Tarreaub625a082007-11-26 01:15:43 +01001277 if (px->lbprm.tot_weight && px->last_change < now.tv_sec) // ignore negative time
Krzysztof Oledzki85130942007-10-22 16:21:10 +02001278 return px->down_time;
1279
1280 return now.tv_sec - px->last_change + px->down_time;
1281}
Willy Tarreaubaaee002006-06-26 02:48:02 +02001282
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01001283/*
1284 * This function returns a string containing the balancing
1285 * mode of the proxy in a format suitable for stats.
1286 */
1287
1288const char *backend_lb_algo_str(int algo) {
1289
1290 if (algo == BE_LB_ALGO_RR)
1291 return "roundrobin";
1292 else if (algo == BE_LB_ALGO_SRR)
1293 return "static-rr";
Willy Tarreauf09c6602012-02-13 17:12:08 +01001294 else if (algo == BE_LB_ALGO_FAS)
1295 return "first";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01001296 else if (algo == BE_LB_ALGO_LC)
1297 return "leastconn";
1298 else if (algo == BE_LB_ALGO_SH)
1299 return "source";
1300 else if (algo == BE_LB_ALGO_UH)
1301 return "uri";
1302 else if (algo == BE_LB_ALGO_PH)
1303 return "url_param";
1304 else if (algo == BE_LB_ALGO_HH)
1305 return "hdr";
1306 else if (algo == BE_LB_ALGO_RCH)
1307 return "rdp-cookie";
1308 else
1309 return NULL;
1310}
1311
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001312/* This function parses a "balance" statement in a backend section describing
1313 * <curproxy>. It returns -1 if there is any error, otherwise zero. If it
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001314 * returns -1, it will write an error message into the <err> buffer which will
1315 * automatically be allocated and must be passed as NULL. The trailing '\n'
1316 * will not be written. The function must be called with <args> pointing to the
1317 * first word after "balance".
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001318 */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001319int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001320{
1321 if (!*(args[0])) {
1322 /* if no option is set, use round-robin by default */
Willy Tarreau31682232007-11-29 15:38:04 +01001323 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1324 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001325 return 0;
1326 }
1327
1328 if (!strcmp(args[0], "roundrobin")) {
Willy Tarreau31682232007-11-29 15:38:04 +01001329 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1330 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001331 }
Willy Tarreau9757a382009-10-03 12:56:50 +02001332 else if (!strcmp(args[0], "static-rr")) {
1333 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1334 curproxy->lbprm.algo |= BE_LB_ALGO_SRR;
1335 }
Willy Tarreauf09c6602012-02-13 17:12:08 +01001336 else if (!strcmp(args[0], "first")) {
1337 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1338 curproxy->lbprm.algo |= BE_LB_ALGO_FAS;
1339 }
Willy Tarreau51406232008-03-10 22:04:20 +01001340 else if (!strcmp(args[0], "leastconn")) {
1341 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1342 curproxy->lbprm.algo |= BE_LB_ALGO_LC;
1343 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001344 else if (!strcmp(args[0], "source")) {
Willy Tarreau31682232007-11-29 15:38:04 +01001345 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1346 curproxy->lbprm.algo |= BE_LB_ALGO_SH;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001347 }
1348 else if (!strcmp(args[0], "uri")) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001349 int arg = 1;
1350
Willy Tarreau31682232007-11-29 15:38:04 +01001351 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1352 curproxy->lbprm.algo |= BE_LB_ALGO_UH;
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001353
Oskar Stolc8dc41842012-05-19 10:19:54 +01001354 curproxy->uri_whole = 0;
1355
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001356 while (*args[arg]) {
1357 if (!strcmp(args[arg], "len")) {
1358 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001359 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001360 return -1;
1361 }
1362 curproxy->uri_len_limit = atoi(args[arg+1]);
1363 arg += 2;
1364 }
1365 else if (!strcmp(args[arg], "depth")) {
1366 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001367 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001368 return -1;
1369 }
1370 /* hint: we store the position of the ending '/' (depth+1) so
1371 * that we avoid a comparison while computing the hash.
1372 */
1373 curproxy->uri_dirs_depth1 = atoi(args[arg+1]) + 1;
1374 arg += 2;
1375 }
Oskar Stolc8dc41842012-05-19 10:19:54 +01001376 else if (!strcmp(args[arg], "whole")) {
1377 curproxy->uri_whole = 1;
1378 arg += 1;
1379 }
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001380 else {
Oskar Stolc8dc41842012-05-19 10:19:54 +01001381 memprintf(err, "%s only accepts parameters 'len', 'depth', and 'whole' (got '%s').", args[0], args[arg]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001382 return -1;
1383 }
1384 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001385 }
Willy Tarreau01732802007-11-01 22:48:15 +01001386 else if (!strcmp(args[0], "url_param")) {
1387 if (!*args[1]) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001388 memprintf(err, "%s requires an URL parameter name.", args[0]);
Willy Tarreau01732802007-11-01 22:48:15 +01001389 return -1;
1390 }
Willy Tarreau31682232007-11-29 15:38:04 +01001391 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1392 curproxy->lbprm.algo |= BE_LB_ALGO_PH;
Willy Tarreaua534fea2008-08-03 12:19:50 +02001393
1394 free(curproxy->url_param_name);
Willy Tarreau01732802007-11-01 22:48:15 +01001395 curproxy->url_param_name = strdup(args[1]);
Willy Tarreaua534fea2008-08-03 12:19:50 +02001396 curproxy->url_param_len = strlen(args[1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02001397 if (*args[2]) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02001398 if (strcmp(args[2], "check_post")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001399 memprintf(err, "%s only accepts 'check_post' modifier (got '%s').", args[0], args[2]);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02001400 return -1;
1401 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02001402 }
Benoitaffb4812009-03-25 13:02:10 +01001403 }
1404 else if (!strncmp(args[0], "hdr(", 4)) {
1405 const char *beg, *end;
1406
1407 beg = args[0] + 4;
1408 end = strchr(beg, ')');
1409
1410 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001411 memprintf(err, "hdr requires an http header field name.");
Benoitaffb4812009-03-25 13:02:10 +01001412 return -1;
1413 }
1414
1415 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1416 curproxy->lbprm.algo |= BE_LB_ALGO_HH;
1417
1418 free(curproxy->hh_name);
1419 curproxy->hh_len = end - beg;
1420 curproxy->hh_name = my_strndup(beg, end - beg);
1421 curproxy->hh_match_domain = 0;
1422
1423 if (*args[1]) {
1424 if (strcmp(args[1], "use_domain_only")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001425 memprintf(err, "%s only accepts 'use_domain_only' modifier (got '%s').", args[0], args[1]);
Benoitaffb4812009-03-25 13:02:10 +01001426 return -1;
1427 }
1428 curproxy->hh_match_domain = 1;
1429 }
Emeric Brun736aa232009-06-30 17:56:00 +02001430 }
1431 else if (!strncmp(args[0], "rdp-cookie", 10)) {
1432 curproxy->lbprm.algo &= ~BE_LB_ALGO;
1433 curproxy->lbprm.algo |= BE_LB_ALGO_RCH;
1434
1435 if ( *(args[0] + 10 ) == '(' ) { /* cookie name */
1436 const char *beg, *end;
1437
1438 beg = args[0] + 11;
1439 end = strchr(beg, ')');
1440
1441 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001442 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02001443 return -1;
1444 }
1445
1446 free(curproxy->hh_name);
1447 curproxy->hh_name = my_strndup(beg, end - beg);
1448 curproxy->hh_len = end - beg;
1449 }
1450 else if ( *(args[0] + 10 ) == '\0' ) { /* default cookie name 'mstshash' */
1451 free(curproxy->hh_name);
1452 curproxy->hh_name = strdup("mstshash");
1453 curproxy->hh_len = strlen(curproxy->hh_name);
1454 }
1455 else { /* syntax */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001456 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02001457 return -1;
1458 }
Willy Tarreau01732802007-11-01 22:48:15 +01001459 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01001460 else {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02001461 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 +01001462 return -1;
1463 }
1464 return 0;
1465}
1466
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001467
1468/************************************************************************/
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001469/* All supported sample and ACL keywords must be declared here. */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001470/************************************************************************/
1471
Willy Tarreau34db1082012-04-19 17:16:54 +02001472/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001473 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001474 * undefined behaviour.
1475 */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001476static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001477smp_fetch_nbsrv(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001478 const struct arg *args, struct sample *smp, const char *kw)
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001479{
Willy Tarreau37406352012-04-23 16:16:37 +02001480 smp->flags = SMP_F_VOL_TEST;
Willy Tarreauf853c462012-04-23 18:53:56 +02001481 smp->type = SMP_T_UINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02001482 px = args->data.prx;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001483
1484 if (px->srv_act)
Willy Tarreauf853c462012-04-23 18:53:56 +02001485 smp->data.uint = px->srv_act;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001486 else if (px->lbprm.fbck)
Willy Tarreauf853c462012-04-23 18:53:56 +02001487 smp->data.uint = 1;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001488 else
Willy Tarreauf853c462012-04-23 18:53:56 +02001489 smp->data.uint = px->srv_bck;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001490
1491 return 1;
1492}
1493
Willy Tarreau37406352012-04-23 16:16:37 +02001494/* report in smp->flags a success or failure depending on the designated
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001495 * server's state. There is no match function involved since there's no pattern.
Willy Tarreau34db1082012-04-19 17:16:54 +02001496 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1497 * undefined behaviour.
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001498 */
1499static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001500smp_fetch_srv_is_up(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001501 const struct arg *args, struct sample *smp, const char *kw)
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001502{
Willy Tarreau24e32d82012-04-23 23:55:44 +02001503 struct server *srv = args->data.srv;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001504
Willy Tarreau37406352012-04-23 16:16:37 +02001505 smp->flags = SMP_F_VOL_TEST;
Willy Tarreauf853c462012-04-23 18:53:56 +02001506 smp->type = SMP_T_BOOL;
Willy Tarreau20125212014-05-13 19:44:56 +02001507 if (!(srv->admin & SRV_ADMF_MAINT) &&
Willy Tarreau892337c2014-05-13 23:41:20 +02001508 (!(srv->check.state & CHK_ST_CONFIGURED) || (srv->state != SRV_ST_STOPPED)))
Willy Tarreau197e10a2012-04-23 19:18:42 +02001509 smp->data.uint = 1;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001510 else
Willy Tarreau197e10a2012-04-23 19:18:42 +02001511 smp->data.uint = 0;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02001512 return 1;
1513}
1514
Willy Tarreau34db1082012-04-19 17:16:54 +02001515/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001516 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001517 * undefined behaviour.
1518 */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001519static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001520smp_fetch_connslots(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001521 const struct arg *args, struct sample *smp, const char *kw)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001522{
1523 struct server *iterator;
Willy Tarreaud28c3532012-04-19 19:28:33 +02001524
Willy Tarreau37406352012-04-23 16:16:37 +02001525 smp->flags = SMP_F_VOL_TEST;
Willy Tarreauf853c462012-04-23 18:53:56 +02001526 smp->type = SMP_T_UINT;
1527 smp->data.uint = 0;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001528
Willy Tarreau24e32d82012-04-23 23:55:44 +02001529 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
Willy Tarreau892337c2014-05-13 23:41:20 +02001530 if (iterator->state == SRV_ST_STOPPED)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001531 continue;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001532
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001533 if (iterator->maxconn == 0 || iterator->maxqueue == 0) {
Willy Tarreaua5e37562011-12-16 17:06:15 +01001534 /* configuration is stupid */
Willy Tarreauf853c462012-04-23 18:53:56 +02001535 smp->data.uint = -1; /* FIXME: stupid value! */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001536 return 1;
1537 }
1538
Willy Tarreauf853c462012-04-23 18:53:56 +02001539 smp->data.uint += (iterator->maxconn - iterator->cur_sess)
Willy Tarreau422aa072012-04-20 20:49:27 +02001540 + (iterator->maxqueue - iterator->nbpend);
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08001541 }
1542
1543 return 1;
1544}
1545
Willy Tarreaua5e37562011-12-16 17:06:15 +01001546/* set temp integer to the id of the backend */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001547static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001548smp_fetch_be_id(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001549 const struct arg *args, struct sample *smp, const char *kw)
Willy Tarreau37406352012-04-23 16:16:37 +02001550{
Willy Tarreauf853c462012-04-23 18:53:56 +02001551 smp->flags = SMP_F_VOL_TXN;
1552 smp->type = SMP_T_UINT;
1553 smp->data.uint = l4->be->uuid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001554 return 1;
1555}
1556
Willy Tarreaua5e37562011-12-16 17:06:15 +01001557/* set temp integer to the id of the server */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001558static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001559smp_fetch_srv_id(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001560 const struct arg *args, struct sample *smp, const char *kw)
Willy Tarreau37406352012-04-23 16:16:37 +02001561{
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001562 if (!objt_server(l4->target))
Willy Tarreau17af4192011-02-23 14:27:06 +01001563 return 0;
1564
Willy Tarreauf853c462012-04-23 18:53:56 +02001565 smp->type = SMP_T_UINT;
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001566 smp->data.uint = objt_server(l4->target)->puid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01001567
1568 return 1;
1569}
1570
Willy Tarreau34db1082012-04-19 17:16:54 +02001571/* set temp integer to the number of connections per second reaching the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001572 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001573 * undefined behaviour.
1574 */
Willy Tarreau079ff0a2009-03-05 21:34:28 +01001575static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001576smp_fetch_be_sess_rate(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001577 const struct arg *args, struct sample *smp, const char *kw)
Willy Tarreau079ff0a2009-03-05 21:34:28 +01001578{
Willy Tarreau37406352012-04-23 16:16:37 +02001579 smp->flags = SMP_F_VOL_TEST;
Willy Tarreauf853c462012-04-23 18:53:56 +02001580 smp->type = SMP_T_UINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02001581 smp->data.uint = read_freq_ctr(&args->data.prx->be_sess_per_sec);
Willy Tarreau079ff0a2009-03-05 21:34:28 +01001582 return 1;
1583}
1584
Willy Tarreau34db1082012-04-19 17:16:54 +02001585/* set temp integer to the number of concurrent connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001586 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001587 * undefined behaviour.
1588 */
Willy Tarreaua36af912009-10-10 12:02:45 +02001589static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001590smp_fetch_be_conn(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001591 const struct arg *args, struct sample *smp, const char *kw)
Willy Tarreaua36af912009-10-10 12:02:45 +02001592{
Willy Tarreau37406352012-04-23 16:16:37 +02001593 smp->flags = SMP_F_VOL_TEST;
Willy Tarreauf853c462012-04-23 18:53:56 +02001594 smp->type = SMP_T_UINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02001595 smp->data.uint = args->data.prx->beconn;
Willy Tarreaua36af912009-10-10 12:02:45 +02001596 return 1;
1597}
1598
Willy Tarreau34db1082012-04-19 17:16:54 +02001599/* set temp integer to the total number of queued connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001600 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001601 * undefined behaviour.
1602 */
Willy Tarreaua36af912009-10-10 12:02:45 +02001603static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001604smp_fetch_queue_size(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001605 const struct arg *args, struct sample *smp, const char *kw)
Willy Tarreaua36af912009-10-10 12:02:45 +02001606{
Willy Tarreau37406352012-04-23 16:16:37 +02001607 smp->flags = SMP_F_VOL_TEST;
Willy Tarreauf853c462012-04-23 18:53:56 +02001608 smp->type = SMP_T_UINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02001609 smp->data.uint = args->data.prx->totpend;
Willy Tarreaua36af912009-10-10 12:02:45 +02001610 return 1;
1611}
1612
Willy Tarreaua5e37562011-12-16 17:06:15 +01001613/* set temp integer to the total number of queued connections on the backend divided
Willy Tarreaua36af912009-10-10 12:02:45 +02001614 * by the number of running servers and rounded up. If there is no running
1615 * server, we return twice the total, just as if we had half a running server.
1616 * This is more or less correct anyway, since we expect the last server to come
1617 * back soon.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02001618 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02001619 * undefined behaviour.
Willy Tarreaua36af912009-10-10 12:02:45 +02001620 */
1621static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001622smp_fetch_avg_queue_size(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001623 const struct arg *args, struct sample *smp, const char *kw)
Willy Tarreaua36af912009-10-10 12:02:45 +02001624{
1625 int nbsrv;
1626
Willy Tarreau37406352012-04-23 16:16:37 +02001627 smp->flags = SMP_F_VOL_TEST;
Willy Tarreauf853c462012-04-23 18:53:56 +02001628 smp->type = SMP_T_UINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02001629 px = args->data.prx;
Willy Tarreaua36af912009-10-10 12:02:45 +02001630
1631 if (px->srv_act)
1632 nbsrv = px->srv_act;
1633 else if (px->lbprm.fbck)
1634 nbsrv = 1;
1635 else
1636 nbsrv = px->srv_bck;
1637
1638 if (nbsrv > 0)
Willy Tarreauf853c462012-04-23 18:53:56 +02001639 smp->data.uint = (px->totpend + nbsrv - 1) / nbsrv;
Willy Tarreaua36af912009-10-10 12:02:45 +02001640 else
Willy Tarreauf853c462012-04-23 18:53:56 +02001641 smp->data.uint = px->totpend * 2;
Willy Tarreaua36af912009-10-10 12:02:45 +02001642
1643 return 1;
1644}
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001645
Willy Tarreau34db1082012-04-19 17:16:54 +02001646/* set temp integer to the number of concurrent connections on the server in the backend.
1647 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1648 * undefined behaviour.
1649 */
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02001650static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001651smp_fetch_srv_conn(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001652 const struct arg *args, struct sample *smp, const char *kw)
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02001653{
Willy Tarreauf853c462012-04-23 18:53:56 +02001654 smp->flags = SMP_F_VOL_TEST;
1655 smp->type = SMP_T_UINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02001656 smp->data.uint = args->data.srv->cur_sess;
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02001657 return 1;
1658}
1659
Tait Clarridge7896d522012-12-05 21:39:31 -05001660/* set temp integer to the number of enabled servers on the proxy.
1661 * Accepts exactly 1 argument. Argument is a server, other types will lead to
1662 * undefined behaviour.
1663 */
1664static int
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001665smp_fetch_srv_sess_rate(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +02001666 const struct arg *args, struct sample *smp, const char *kw)
Tait Clarridge7896d522012-12-05 21:39:31 -05001667{
1668 smp->flags = SMP_F_VOL_TEST;
1669 smp->type = SMP_T_UINT;
1670 smp->data.uint = read_freq_ctr(&args->data.srv->sess_per_sec);
1671 return 1;
1672}
1673
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001674
1675/* Note: must not be declared <const> as its list will be overwritten.
1676 * Please take care of keeping this list alphabetically sorted.
1677 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02001678static struct sample_fetch_kw_list smp_kws = {ILH, {
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001679 { "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
1680 { "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
1681 { "be_id", smp_fetch_be_id, 0, NULL, SMP_T_UINT, SMP_USE_BKEND, },
1682 { "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
1683 { "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
1684 { "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
1685 { "queue", smp_fetch_queue_size, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
1686 { "srv_conn", smp_fetch_srv_conn, ARG1(1,SRV), NULL, SMP_T_UINT, SMP_USE_INTRN, },
1687 { "srv_id", smp_fetch_srv_id, 0, NULL, SMP_T_UINT, SMP_USE_SERVR, },
1688 { "srv_is_up", smp_fetch_srv_is_up, ARG1(1,SRV), NULL, SMP_T_BOOL, SMP_USE_INTRN, },
1689 { "srv_sess_rate", smp_fetch_srv_sess_rate, ARG1(1,SRV), NULL, SMP_T_UINT, SMP_USE_INTRN, },
1690 { /* END */ },
1691}};
1692
1693
Willy Tarreau61612d42012-04-19 18:42:05 +02001694/* Note: must not be declared <const> as its list will be overwritten.
1695 * Please take care of keeping this list alphabetically sorted.
1696 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02001697static struct acl_kw_list acl_kws = {ILH, {
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001698 { /* END */ },
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001699}};
1700
1701
1702__attribute__((constructor))
1703static void __backend_init(void)
1704{
Willy Tarreau1a7eca12013-01-07 22:38:03 +01001705 sample_register_fetches(&smp_kws);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01001706 acl_register_keywords(&acl_kws);
1707}
1708
Willy Tarreaubaaee002006-06-26 02:48:02 +02001709/*
1710 * Local variables:
1711 * c-indent-level: 8
1712 * c-basic-offset: 8
1713 * End:
1714 */