blob: 181cdd8bdc2fb0bd5992133e282f4fcfcf1370b1 [file] [log] [blame]
Willy Tarreaubaaee002006-06-26 02:48:02 +02001/*
2 * Proxy variables and functions.
3 *
Willy Tarreau3a7d2072009-03-05 23:48:25 +01004 * Copyright 2000-2009 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 <fcntl.h>
14#include <unistd.h>
Willy Tarreauc8f24f82007-11-30 18:38:35 +010015#include <string.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020016#include <sys/types.h>
17#include <sys/socket.h>
18#include <sys/stat.h>
19
Willy Tarreau2dd0d472006-06-29 17:53:05 +020020#include <common/defaults.h>
Willy Tarreau9de1bbd2008-07-09 20:34:27 +020021#include <common/cfgparse.h>
Willy Tarreau2dd0d472006-06-29 17:53:05 +020022#include <common/compat.h>
Willy Tarreaue3ba5f02006-06-29 18:54:54 +020023#include <common/config.h>
Willy Tarreaud740bab2007-10-28 11:14:07 +010024#include <common/errors.h>
Willy Tarreau4d2d0982007-05-14 00:39:29 +020025#include <common/memory.h>
Willy Tarreau2dd0d472006-06-29 17:53:05 +020026#include <common/time.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020027
28#include <types/global.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020029
30#include <proto/client.h>
Alexandre Cassen87ea5482007-10-11 20:48:58 +020031#include <proto/backend.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020032#include <proto/fd.h>
Willy Tarreau51aecc72009-07-12 09:47:04 +020033#include <proto/hdr_idx.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020034#include <proto/log.h>
Willy Tarreaue6b98942007-10-29 01:09:36 +010035#include <proto/protocols.h>
36#include <proto/proto_tcp.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020037#include <proto/proxy.h>
38
39
Willy Tarreaue6b98942007-10-29 01:09:36 +010040int listeners; /* # of proxy listeners, set by cfgparse, unset by maintain_proxies */
Willy Tarreaubaaee002006-06-26 02:48:02 +020041struct proxy *proxy = NULL; /* list of all existing proxies */
Willy Tarreau53fb4ae2009-10-04 23:04:08 +020042struct eb_root used_proxy_id = EB_ROOT; /* list of proxy IDs in use */
Willy Tarreaubaaee002006-06-26 02:48:02 +020043
Willy Tarreau977b8e42006-12-29 14:19:17 +010044/*
Willy Tarreau816eb542007-11-04 07:04:43 +010045 * This function returns a string containing a name describing capabilities to
46 * report comprehensible error messages. Specifically, it will return the words
47 * "frontend", "backend", "ruleset" when appropriate, or "proxy" for all other
48 * cases including the proxies declared in "listen" mode.
Willy Tarreau977b8e42006-12-29 14:19:17 +010049 */
Willy Tarreau816eb542007-11-04 07:04:43 +010050const char *proxy_cap_str(int cap)
Willy Tarreau977b8e42006-12-29 14:19:17 +010051{
Willy Tarreau816eb542007-11-04 07:04:43 +010052 if ((cap & PR_CAP_LISTEN) != PR_CAP_LISTEN) {
53 if (cap & PR_CAP_FE)
54 return "frontend";
55 else if (cap & PR_CAP_BE)
56 return "backend";
57 else if (cap & PR_CAP_RS)
58 return "ruleset";
59 }
60 return "proxy";
Willy Tarreau977b8e42006-12-29 14:19:17 +010061}
62
Krzysztof Piotr Oledzki6eb730d2007-11-03 23:41:58 +010063/*
64 * This function returns a string containing the mode of the proxy in a format
65 * suitable for error messages.
66 */
Krzysztof Piotr Oledzki6eb730d2007-11-03 23:41:58 +010067const char *proxy_mode_str(int mode) {
68
69 if (mode == PR_MODE_TCP)
70 return "tcp";
71 else if (mode == PR_MODE_HTTP)
72 return "http";
73 else if (mode == PR_MODE_HEALTH)
74 return "health";
75 else
76 return "unknown";
77}
78
Willy Tarreauf3950172009-10-10 18:35:51 +020079/*
80 * This function scans the list of backends and servers to retrieve the first
81 * backend and the first server with the given names, and sets them in both
82 * parameters. It returns zero if either is not found, or non-zero and sets
83 * the ones it did not found to NULL. If a NULL pointer is passed for the
84 * backend, only the pointer to the server will be updated.
85 */
86int get_backend_server(const char *bk_name, const char *sv_name,
87 struct proxy **bk, struct server **sv)
88{
89 struct proxy *p;
90 struct server *s;
Willy Tarreaucfeaa472009-10-10 22:33:08 +020091 int pid, sid;
Willy Tarreauf3950172009-10-10 18:35:51 +020092
93 *sv = NULL;
94
Willy Tarreaucfeaa472009-10-10 22:33:08 +020095 pid = 0;
96 if (*bk_name == '#')
97 pid = atoi(bk_name + 1);
98 sid = 0;
99 if (*sv_name == '#')
100 sid = atoi(sv_name + 1);
101
Willy Tarreauf3950172009-10-10 18:35:51 +0200102 for (p = proxy; p; p = p->next)
Willy Tarreaucfeaa472009-10-10 22:33:08 +0200103 if ((p->cap & PR_CAP_BE) &&
104 ((pid && p->uuid == pid) ||
105 (!pid && strcmp(p->id, bk_name) == 0)))
Willy Tarreauf3950172009-10-10 18:35:51 +0200106 break;
107 if (bk)
108 *bk = p;
109 if (!p)
110 return 0;
111
112 for (s = p->srv; s; s = s->next)
Willy Tarreaucfeaa472009-10-10 22:33:08 +0200113 if ((sid && s->puid == sid) ||
114 (!sid && strcmp(s->id, sv_name) == 0))
Willy Tarreauf3950172009-10-10 18:35:51 +0200115 break;
116 *sv = s;
117 if (!s)
118 return 0;
119 return 1;
120}
121
Willy Tarreaue219db72007-12-03 01:30:13 +0100122/* This function parses a "timeout" statement in a proxy section. It returns
123 * -1 if there is any error, 1 for a warning, otherwise zero. If it does not
124 * return zero, it may write an error message into the <err> buffer, for at
125 * most <errlen> bytes, trailing zero included. The trailing '\n' must not
126 * be written. The function must be called with <args> pointing to the first
Willy Tarreau9de1bbd2008-07-09 20:34:27 +0200127 * command line word, with <proxy> pointing to the proxy being parsed, and
Willy Tarreaue219db72007-12-03 01:30:13 +0100128 * <defpx> to the default proxy or NULL. As a special case for compatibility
129 * with older configs, it also accepts "{cli|srv|con}timeout" in args[0].
130 */
Willy Tarreau9de1bbd2008-07-09 20:34:27 +0200131static int proxy_parse_timeout(char **args, int section, struct proxy *proxy,
132 struct proxy *defpx, char *err, int errlen)
Willy Tarreaue219db72007-12-03 01:30:13 +0100133{
134 unsigned timeout;
135 int retval, cap;
136 const char *res, *name;
Willy Tarreau0c303ee2008-07-07 00:09:58 +0200137 int *tv = NULL;
138 int *td = NULL;
Willy Tarreaue219db72007-12-03 01:30:13 +0100139
140 retval = 0;
Willy Tarreau9de1bbd2008-07-09 20:34:27 +0200141
142 /* simply skip "timeout" but remain compatible with old form */
143 if (strcmp(args[0], "timeout") == 0)
144 args++;
145
Willy Tarreaue219db72007-12-03 01:30:13 +0100146 name = args[0];
147 if (!strcmp(args[0], "client") || !strcmp(args[0], "clitimeout")) {
148 name = "client";
Willy Tarreaud7c30f92007-12-03 01:38:36 +0100149 tv = &proxy->timeout.client;
150 td = &defpx->timeout.client;
Willy Tarreaue219db72007-12-03 01:30:13 +0100151 cap = PR_CAP_FE;
152 } else if (!strcmp(args[0], "tarpit")) {
153 tv = &proxy->timeout.tarpit;
154 td = &defpx->timeout.tarpit;
Willy Tarreau51c9bde2008-01-06 13:40:03 +0100155 cap = PR_CAP_FE | PR_CAP_BE;
Willy Tarreau036fae02008-01-06 13:24:40 +0100156 } else if (!strcmp(args[0], "http-request")) {
157 tv = &proxy->timeout.httpreq;
158 td = &defpx->timeout.httpreq;
Willy Tarreaucd7afc02009-07-12 10:03:17 +0200159 cap = PR_CAP_FE | PR_CAP_BE;
Willy Tarreaue219db72007-12-03 01:30:13 +0100160 } else if (!strcmp(args[0], "server") || !strcmp(args[0], "srvtimeout")) {
161 name = "server";
Willy Tarreaud7c30f92007-12-03 01:38:36 +0100162 tv = &proxy->timeout.server;
163 td = &defpx->timeout.server;
Willy Tarreaue219db72007-12-03 01:30:13 +0100164 cap = PR_CAP_BE;
165 } else if (!strcmp(args[0], "connect") || !strcmp(args[0], "contimeout")) {
166 name = "connect";
Willy Tarreaud7c30f92007-12-03 01:38:36 +0100167 tv = &proxy->timeout.connect;
168 td = &defpx->timeout.connect;
Willy Tarreaue219db72007-12-03 01:30:13 +0100169 cap = PR_CAP_BE;
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +0100170 } else if (!strcmp(args[0], "check")) {
171 tv = &proxy->timeout.check;
172 td = &defpx->timeout.check;
173 cap = PR_CAP_BE;
Willy Tarreaue219db72007-12-03 01:30:13 +0100174 } else if (!strcmp(args[0], "appsession")) {
Willy Tarreaud7c30f92007-12-03 01:38:36 +0100175 tv = &proxy->timeout.appsession;
176 td = &defpx->timeout.appsession;
Willy Tarreaue219db72007-12-03 01:30:13 +0100177 cap = PR_CAP_BE;
178 } else if (!strcmp(args[0], "queue")) {
179 tv = &proxy->timeout.queue;
180 td = &defpx->timeout.queue;
181 cap = PR_CAP_BE;
182 } else {
Willy Tarreau036fae02008-01-06 13:24:40 +0100183 snprintf(err, errlen,
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +0100184 "timeout '%s': must be 'client', 'server', 'connect', 'check', "
Willy Tarreau036fae02008-01-06 13:24:40 +0100185 "'appsession', 'queue', 'http-request' or 'tarpit'",
Willy Tarreaue219db72007-12-03 01:30:13 +0100186 args[0]);
187 return -1;
188 }
189
190 if (*args[1] == 0) {
191 snprintf(err, errlen, "%s timeout expects an integer value (in milliseconds)", name);
192 return -1;
193 }
194
195 res = parse_time_err(args[1], &timeout, TIME_UNIT_MS);
196 if (res) {
Willy Tarreaubb9251e2009-03-06 08:05:40 +0100197 snprintf(err, errlen, "unexpected character '%c' in %s timeout", *res, name);
Willy Tarreaue219db72007-12-03 01:30:13 +0100198 return -1;
199 }
200
201 if (!(proxy->cap & cap)) {
202 snprintf(err, errlen, "%s timeout will be ignored because %s '%s' has no %s capability",
203 name, proxy_type_str(proxy), proxy->id,
204 (cap & PR_CAP_BE) ? "backend" : "frontend");
205 retval = 1;
206 }
Willy Tarreau0c303ee2008-07-07 00:09:58 +0200207 else if (defpx && *tv != *td) {
Willy Tarreaue219db72007-12-03 01:30:13 +0100208 snprintf(err, errlen, "overwriting %s timeout which was already specified", name);
209 retval = 1;
210 }
211
Willy Tarreau0c303ee2008-07-07 00:09:58 +0200212 *tv = MS_TO_TICKS(timeout);
Willy Tarreaue219db72007-12-03 01:30:13 +0100213 return retval;
214}
215
Willy Tarreau3a7d2072009-03-05 23:48:25 +0100216/* This function parses a "rate-limit" statement in a proxy section. It returns
217 * -1 if there is any error, 1 for a warning, otherwise zero. If it does not
218 * return zero, it may write an error message into the <err> buffer, for at
219 * most <errlen> bytes, trailing zero included. The trailing '\n' must not
220 * be written. The function must be called with <args> pointing to the first
221 * command line word, with <proxy> pointing to the proxy being parsed, and
222 * <defpx> to the default proxy or NULL.
223 */
224static int proxy_parse_rate_limit(char **args, int section, struct proxy *proxy,
225 struct proxy *defpx, char *err, int errlen)
226{
227 int retval, cap;
228 char *res, *name;
229 unsigned int *tv = NULL;
230 unsigned int *td = NULL;
231 unsigned int val;
232
233 retval = 0;
234
235 /* simply skip "rate-limit" */
236 if (strcmp(args[0], "rate-limit") == 0)
237 args++;
238
239 name = args[0];
240 if (!strcmp(args[0], "sessions")) {
241 name = "sessions";
Willy Tarreau13a34bd2009-05-10 18:52:49 +0200242 tv = &proxy->fe_sps_lim;
243 td = &defpx->fe_sps_lim;
Willy Tarreau3a7d2072009-03-05 23:48:25 +0100244 cap = PR_CAP_FE;
245 } else {
246 snprintf(err, errlen,
247 "%s '%s': must be 'sessions'",
248 "rate-limit", args[0]);
249 return -1;
250 }
251
252 if (*args[1] == 0) {
253 snprintf(err, errlen, "%s %s expects expects an integer value (in sessions/second)", "rate-limit", name);
254 return -1;
255 }
256
257 val = strtoul(args[1], &res, 0);
258 if (*res) {
259 snprintf(err, errlen, "%s %s: unexpected character '%c' in integer value '%s'", "rate-limit", name, *res, args[1]);
260 return -1;
261 }
262
263 if (!(proxy->cap & cap)) {
264 snprintf(err, errlen, "%s %s will be ignored because %s '%s' has no %s capability",
265 "rate-limit", name, proxy_type_str(proxy), proxy->id,
266 (cap & PR_CAP_BE) ? "backend" : "frontend");
267 retval = 1;
268 }
269 else if (defpx && *tv != *td) {
270 snprintf(err, errlen, "overwriting %s %s which was already specified", "rate-limit", name);
271 retval = 1;
272 }
273
274 *tv = val;
275 return retval;
276}
277
Krzysztof Piotr Oledzki6eb730d2007-11-03 23:41:58 +0100278/*
279 * This function finds a proxy with matching name, mode and with satisfying
280 * capabilities. It also checks if there are more matching proxies with
281 * requested name as this often leads into unexpected situations.
282 */
283
Alex Williams96532db2009-11-01 21:27:13 -0500284struct proxy *findproxy_mode(const char *name, int mode, int cap) {
Krzysztof Piotr Oledzki6eb730d2007-11-03 23:41:58 +0100285
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100286 struct proxy *curproxy, *target = NULL;
Krzysztof Piotr Oledzki6eb730d2007-11-03 23:41:58 +0100287
288 for (curproxy = proxy; curproxy; curproxy = curproxy->next) {
289 if ((curproxy->cap & cap)!=cap || strcmp(curproxy->id, name))
290 continue;
291
Willy Tarreau51aecc72009-07-12 09:47:04 +0200292 if (curproxy->mode != mode &&
293 !(curproxy->mode == PR_MODE_HTTP && mode == PR_MODE_TCP)) {
Krzysztof Piotr Oledzki6eb730d2007-11-03 23:41:58 +0100294 Alert("Unable to use proxy '%s' with wrong mode, required: %s, has: %s.\n",
295 name, proxy_mode_str(mode), proxy_mode_str(curproxy->mode));
296 Alert("You may want to use 'mode %s'.\n", proxy_mode_str(mode));
297 return NULL;
298 }
299
300 if (!target) {
301 target = curproxy;
302 continue;
303 }
304
Willy Tarreau816eb542007-11-04 07:04:43 +0100305 Alert("Refusing to use duplicated proxy '%s' with overlapping capabilities: %s/%s!\n",
Krzysztof Piotr Oledzki6eb730d2007-11-03 23:41:58 +0100306 name, proxy_type_str(curproxy), proxy_type_str(target));
307
308 return NULL;
309 }
310
311 return target;
312}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200313
Alex Williams96532db2009-11-01 21:27:13 -0500314struct proxy *findproxy(const char *name, int cap) {
315
316 struct proxy *curproxy, *target = NULL;
317
318 for (curproxy = proxy; curproxy; curproxy = curproxy->next) {
319 if ((curproxy->cap & cap)!=cap || strcmp(curproxy->id, name))
320 continue;
321
322 if (!target) {
323 target = curproxy;
324 continue;
325 }
326
327 return NULL;
328 }
329
330 return target;
331}
332
Willy Tarreaubaaee002006-06-26 02:48:02 +0200333/*
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100334 * This function finds a server with matching name within selected proxy.
335 * It also checks if there are more matching servers with
336 * requested name as this often leads into unexpected situations.
337 */
338
339struct server *findserver(const struct proxy *px, const char *name) {
340
341 struct server *cursrv, *target = NULL;
342
343 if (!px)
344 return NULL;
345
346 for (cursrv = px->srv; cursrv; cursrv = cursrv->next) {
347 if (strcmp(cursrv->id, name))
348 continue;
349
350 if (!target) {
351 target = cursrv;
352 continue;
353 }
354
355 Alert("Refusing to use duplicated server '%s' fould in proxy: %s!\n",
356 name, px->id);
357
358 return NULL;
359 }
360
361 return target;
362}
363
Willy Tarreauff01a212009-03-15 13:46:16 +0100364/* This function checks that the designated proxy has no http directives
365 * enabled. It will output a warning if there are, and will fix some of them.
366 * It returns the number of fatal errors encountered. This should be called
367 * at the end of the configuration parsing if the proxy is not in http mode.
368 * The <file> argument is used to construct the error message.
369 */
Willy Tarreau915e1eb2009-06-22 15:48:36 +0200370int proxy_cfg_ensure_no_http(struct proxy *curproxy)
Willy Tarreauff01a212009-03-15 13:46:16 +0100371{
372 if (curproxy->cookie_name != NULL) {
Willy Tarreau915e1eb2009-06-22 15:48:36 +0200373 Warning("config : cookie will be ignored for %s '%s' (needs 'mode http').\n",
374 proxy_type_str(curproxy), curproxy->id);
Willy Tarreauff01a212009-03-15 13:46:16 +0100375 }
376 if (curproxy->rsp_exp != NULL) {
Willy Tarreau915e1eb2009-06-22 15:48:36 +0200377 Warning("config : server regular expressions will be ignored for %s '%s' (needs 'mode http').\n",
378 proxy_type_str(curproxy), curproxy->id);
Willy Tarreauff01a212009-03-15 13:46:16 +0100379 }
380 if (curproxy->req_exp != NULL) {
Willy Tarreau915e1eb2009-06-22 15:48:36 +0200381 Warning("config : client regular expressions will be ignored for %s '%s' (needs 'mode http').\n",
382 proxy_type_str(curproxy), curproxy->id);
Willy Tarreauff01a212009-03-15 13:46:16 +0100383 }
384 if (curproxy->monitor_uri != NULL) {
Willy Tarreau915e1eb2009-06-22 15:48:36 +0200385 Warning("config : monitor-uri will be ignored for %s '%s' (needs 'mode http').\n",
386 proxy_type_str(curproxy), curproxy->id);
Willy Tarreauff01a212009-03-15 13:46:16 +0100387 }
Willy Tarreauf3e49f92009-10-03 12:21:20 +0200388 if (curproxy->lbprm.algo & BE_LB_NEED_HTTP) {
Willy Tarreauff01a212009-03-15 13:46:16 +0100389 curproxy->lbprm.algo &= ~BE_LB_ALGO;
390 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreau915e1eb2009-06-22 15:48:36 +0200391 Warning("config : Layer 7 hash not possible for %s '%s' (needs 'mode http'). Falling back to round robin.\n",
392 proxy_type_str(curproxy), curproxy->id);
Willy Tarreauff01a212009-03-15 13:46:16 +0100393 }
394 return 0;
395}
396
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100397/*
Willy Tarreau2ff76222007-04-09 19:29:56 +0200398 * This function creates all proxy sockets. It should be done very early,
399 * typically before privileges are dropped. The sockets will be registered
400 * but not added to any fd_set, in order not to loose them across the fork().
401 * The proxies also start in IDLE state, meaning that it will be
402 * maintain_proxies that will finally complete their loading.
403 *
404 * Its return value is composed from ERR_NONE, ERR_RETRYABLE and ERR_FATAL.
405 * Retryable errors will only be printed if <verbose> is not zero.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200406 */
407int start_proxies(int verbose)
408{
409 struct proxy *curproxy;
410 struct listener *listener;
Willy Tarreaue6b98942007-10-29 01:09:36 +0100411 int lerr, err = ERR_NONE;
412 int pxerr;
413 char msg[100];
Willy Tarreaubaaee002006-06-26 02:48:02 +0200414
415 for (curproxy = proxy; curproxy != NULL; curproxy = curproxy->next) {
416 if (curproxy->state != PR_STNEW)
417 continue; /* already initialized */
418
419 pxerr = 0;
420 for (listener = curproxy->listen; listener != NULL; listener = listener->next) {
Willy Tarreaue6b98942007-10-29 01:09:36 +0100421 if (listener->state != LI_ASSIGNED)
422 continue; /* already started */
Willy Tarreaubaaee002006-06-26 02:48:02 +0200423
Willy Tarreaue6b98942007-10-29 01:09:36 +0100424 lerr = tcp_bind_listener(listener, msg, sizeof(msg));
Willy Tarreaubaaee002006-06-26 02:48:02 +0200425
Willy Tarreaue6b98942007-10-29 01:09:36 +0100426 /* errors are reported if <verbose> is set or if they are fatal */
427 if (verbose || (lerr & (ERR_FATAL | ERR_ABORT))) {
428 if (lerr & ERR_ALERT)
429 Alert("Starting %s %s: %s\n",
430 proxy_type_str(curproxy), curproxy->id, msg);
431 else if (lerr & ERR_WARN)
432 Warning("Starting %s %s: %s\n",
433 proxy_type_str(curproxy), curproxy->id, msg);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200434 }
435
Willy Tarreaue6b98942007-10-29 01:09:36 +0100436 err |= lerr;
437 if (lerr & (ERR_ABORT | ERR_FATAL)) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200438 pxerr |= 1;
Willy Tarreaue6b98942007-10-29 01:09:36 +0100439 break;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200440 }
Willy Tarreaue6b98942007-10-29 01:09:36 +0100441 else if (lerr & ERR_CODE) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200442 pxerr |= 1;
443 continue;
444 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200445 }
446
447 if (!pxerr) {
Willy Tarreau2ff76222007-04-09 19:29:56 +0200448 curproxy->state = PR_STIDLE;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200449 send_log(curproxy, LOG_NOTICE, "Proxy %s started.\n", curproxy->id);
450 }
Willy Tarreaue6b98942007-10-29 01:09:36 +0100451
452 if (err & ERR_ABORT)
453 break;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200454 }
455
456 return err;
457}
458
459
460/*
461 * this function enables proxies when there are enough free sessions,
462 * or stops them when the table is full. It is designed to be called from the
Willy Tarreau58b458d2008-06-29 22:40:23 +0200463 * select_loop(). It adjusts the date of next expiration event during stop
464 * time if appropriate.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200465 */
Willy Tarreau0c303ee2008-07-07 00:09:58 +0200466void maintain_proxies(int *next)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200467{
468 struct proxy *p;
469 struct listener *l;
Willy Tarreau79584222009-03-06 09:18:27 +0100470 unsigned int wait;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200471
472 p = proxy;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200473
474 /* if there are enough free sessions, we'll activate proxies */
475 if (actconn < global.maxconn) {
Willy Tarreau3a7d2072009-03-05 23:48:25 +0100476 for (; p; p = p->next) {
477 /* check the various reasons we may find to block the frontend */
478 if (p->feconn >= p->maxconn)
479 goto do_block;
480
Willy Tarreau13a34bd2009-05-10 18:52:49 +0200481 if (p->fe_sps_lim &&
482 (wait = next_event_delay(&p->fe_sess_per_sec, p->fe_sps_lim, 0))) {
Willy Tarreau3a7d2072009-03-05 23:48:25 +0100483 /* we're blocking because a limit was reached on the number of
484 * requests/s on the frontend. We want to re-check ASAP, which
Willy Tarreauefcbc6e2009-03-06 08:27:10 +0100485 * means in 1 ms before estimated expiration date, because the
486 * timer will have settled down. Note that we may already be in
487 * IDLE state here.
Willy Tarreau3a7d2072009-03-05 23:48:25 +0100488 */
Willy Tarreauefcbc6e2009-03-06 08:27:10 +0100489 *next = tick_first(*next, tick_add(now_ms, wait));
Willy Tarreau3a7d2072009-03-05 23:48:25 +0100490 goto do_block;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200491 }
Willy Tarreau3a7d2072009-03-05 23:48:25 +0100492
493 /* OK we have no reason to block, so let's unblock if we were blocking */
494 if (p->state == PR_STIDLE) {
495 for (l = p->listen; l != NULL; l = l->next)
496 enable_listener(l);
497 p->state = PR_STRUN;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200498 }
Willy Tarreau3a7d2072009-03-05 23:48:25 +0100499 continue;
500
501 do_block:
502 if (p->state == PR_STRUN) {
503 for (l = p->listen; l != NULL; l = l->next)
504 disable_listener(l);
505 p->state = PR_STIDLE;
506 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200507 }
508 }
509 else { /* block all proxies */
510 while (p) {
511 if (p->state == PR_STRUN) {
Willy Tarreaue6b98942007-10-29 01:09:36 +0100512 for (l = p->listen; l != NULL; l = l->next)
513 disable_listener(l);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200514 p->state = PR_STIDLE;
515 }
516 p = p->next;
517 }
518 }
519
520 if (stopping) {
521 p = proxy;
522 while (p) {
523 if (p->state != PR_STSTOPPED) {
524 int t;
Willy Tarreau0c303ee2008-07-07 00:09:58 +0200525 t = tick_remain(now_ms, p->stop_time);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200526 if (t == 0) {
527 Warning("Proxy %s stopped.\n", p->id);
528 send_log(p, LOG_WARNING, "Proxy %s stopped.\n", p->id);
Willy Tarreauda250db2008-10-12 12:07:48 +0200529 stop_proxy(p);
Willy Tarreau4d2d0982007-05-14 00:39:29 +0200530 /* try to free more memory */
531 pool_gc2();
Willy Tarreaubaaee002006-06-26 02:48:02 +0200532 }
533 else {
Willy Tarreau0c303ee2008-07-07 00:09:58 +0200534 *next = tick_first(*next, p->stop_time);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200535 }
536 }
537 p = p->next;
538 }
539 }
Willy Tarreaud825eef2007-05-12 22:35:00 +0200540 return;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200541}
542
543
544/*
545 * this function disables health-check servers so that the process will quickly be ignored
546 * by load balancers. Note that if a proxy was already in the PAUSED state, then its grace
547 * time will not be used since it would already not listen anymore to the socket.
548 */
549void soft_stop(void)
550{
551 struct proxy *p;
552
553 stopping = 1;
554 p = proxy;
Willy Tarreaub0b37bc2008-06-23 14:00:57 +0200555 tv_update_date(0,1); /* else, the old time before select will be used */
Willy Tarreaubaaee002006-06-26 02:48:02 +0200556 while (p) {
557 if (p->state != PR_STSTOPPED) {
Willy Tarreauf8fbcef2008-10-10 17:51:34 +0200558 Warning("Stopping %s %s in %d ms.\n", proxy_cap_str(p->cap), p->id, p->grace);
559 send_log(p, LOG_WARNING, "Stopping %s %s in %d ms.\n", proxy_cap_str(p->cap), p->id, p->grace);
Willy Tarreau0c303ee2008-07-07 00:09:58 +0200560 p->stop_time = tick_add(now_ms, p->grace);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200561 }
562 p = p->next;
563 }
564}
565
566
567/*
568 * Linux unbinds the listen socket after a SHUT_RD, and ignores SHUT_WR.
569 * Solaris refuses either shutdown().
570 * OpenBSD ignores SHUT_RD but closes upon SHUT_WR and refuses to rebind.
571 * So a common validation path involves SHUT_WR && listen && SHUT_RD.
572 * If disabling at least one listener returns an error, then the proxy
573 * state is set to PR_STERROR because we don't know how to resume from this.
574 */
575void pause_proxy(struct proxy *p)
576{
577 struct listener *l;
578 for (l = p->listen; l != NULL; l = l->next) {
579 if (shutdown(l->fd, SHUT_WR) == 0 &&
Willy Tarreauc73ce2b2008-01-06 10:55:10 +0100580 listen(l->fd, p->backlog ? p->backlog : p->maxconn) == 0 &&
Willy Tarreaubaaee002006-06-26 02:48:02 +0200581 shutdown(l->fd, SHUT_RD) == 0) {
Willy Tarreauf161a342007-04-08 16:59:42 +0200582 EV_FD_CLR(l->fd, DIR_RD);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200583 if (p->state != PR_STERROR)
584 p->state = PR_STPAUSED;
585 }
586 else
587 p->state = PR_STERROR;
588 }
Willy Tarreauda250db2008-10-12 12:07:48 +0200589}
590
591
592/*
593 * This function completely stops a proxy and releases its listeners. It has
594 * to be called when going down in order to release the ports so that another
595 * process may bind to them. It must also be called on disabled proxies at the
596 * end of start-up. When all listeners are closed, the proxy is set to the
597 * PR_STSTOPPED state.
598 */
599void stop_proxy(struct proxy *p)
600{
601 struct listener *l;
602
603 for (l = p->listen; l != NULL; l = l->next) {
604 unbind_listener(l);
605 if (l->state >= LI_ASSIGNED) {
606 delete_listener(l);
607 listeners--;
608 }
609 }
610 p->state = PR_STSTOPPED;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200611}
612
613/*
614 * This function temporarily disables listening so that another new instance
615 * can start listening. It is designed to be called upon reception of a
616 * SIGTTOU, after which either a SIGUSR1 can be sent to completely stop
617 * the proxy, or a SIGTTIN can be sent to listen again.
618 */
619void pause_proxies(void)
620{
621 int err;
622 struct proxy *p;
623
624 err = 0;
625 p = proxy;
Willy Tarreaub0b37bc2008-06-23 14:00:57 +0200626 tv_update_date(0,1); /* else, the old time before select will be used */
Willy Tarreaubaaee002006-06-26 02:48:02 +0200627 while (p) {
Willy Tarreauf8fbcef2008-10-10 17:51:34 +0200628 if (p->cap & PR_CAP_FE &&
629 p->state != PR_STERROR &&
Willy Tarreaubaaee002006-06-26 02:48:02 +0200630 p->state != PR_STSTOPPED &&
631 p->state != PR_STPAUSED) {
Willy Tarreauf8fbcef2008-10-10 17:51:34 +0200632 Warning("Pausing %s %s.\n", proxy_cap_str(p->cap), p->id);
633 send_log(p, LOG_WARNING, "Pausing %s %s.\n", proxy_cap_str(p->cap), p->id);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200634 pause_proxy(p);
635 if (p->state != PR_STPAUSED) {
636 err |= 1;
Willy Tarreauf8fbcef2008-10-10 17:51:34 +0200637 Warning("%s %s failed to enter pause mode.\n", proxy_cap_str(p->cap), p->id);
638 send_log(p, LOG_WARNING, "%s %s failed to enter pause mode.\n", proxy_cap_str(p->cap), p->id);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200639 }
640 }
641 p = p->next;
642 }
643 if (err) {
644 Warning("Some proxies refused to pause, performing soft stop now.\n");
645 send_log(p, LOG_WARNING, "Some proxies refused to pause, performing soft stop now.\n");
646 soft_stop();
647 }
648}
649
650
651/*
652 * This function reactivates listening. This can be used after a call to
653 * sig_pause(), for example when a new instance has failed starting up.
654 * It is designed to be called upon reception of a SIGTTIN.
655 */
656void listen_proxies(void)
657{
658 struct proxy *p;
659 struct listener *l;
660
661 p = proxy;
Willy Tarreaub0b37bc2008-06-23 14:00:57 +0200662 tv_update_date(0,1); /* else, the old time before select will be used */
Willy Tarreaubaaee002006-06-26 02:48:02 +0200663 while (p) {
664 if (p->state == PR_STPAUSED) {
Willy Tarreauf8fbcef2008-10-10 17:51:34 +0200665 Warning("Enabling %s %s.\n", proxy_cap_str(p->cap), p->id);
666 send_log(p, LOG_WARNING, "Enabling %s %s.\n", proxy_cap_str(p->cap), p->id);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200667
668 for (l = p->listen; l != NULL; l = l->next) {
Willy Tarreauc73ce2b2008-01-06 10:55:10 +0100669 if (listen(l->fd, p->backlog ? p->backlog : p->maxconn) == 0) {
Willy Tarreauf1221aa2006-12-17 22:14:12 +0100670 if (actconn < global.maxconn && p->feconn < p->maxconn) {
Willy Tarreauf161a342007-04-08 16:59:42 +0200671 EV_FD_SET(l->fd, DIR_RD);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200672 p->state = PR_STRUN;
673 }
674 else
675 p->state = PR_STIDLE;
676 } else {
677 int port;
678
679 if (l->addr.ss_family == AF_INET6)
680 port = ntohs(((struct sockaddr_in6 *)(&l->addr))->sin6_port);
681 else
682 port = ntohs(((struct sockaddr_in *)(&l->addr))->sin_port);
683
Willy Tarreauf8fbcef2008-10-10 17:51:34 +0200684 Warning("Port %d busy while trying to enable %s %s.\n",
685 port, proxy_cap_str(p->cap), p->id);
686 send_log(p, LOG_WARNING, "Port %d busy while trying to enable %s %s.\n",
687 port, proxy_cap_str(p->cap), p->id);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200688 /* Another port might have been enabled. Let's stop everything. */
689 pause_proxy(p);
690 break;
691 }
692 }
693 }
694 p = p->next;
695 }
696}
697
Willy Tarreau1d0dfb12009-07-07 15:10:31 +0200698/* Set current session's backend to <be>. Nothing is done if the
699 * session already had a backend assigned, which is indicated by
700 * s->flags & SN_BE_ASSIGNED.
701 * All flags, stats and counters which need be updated are updated.
Willy Tarreaubedb9ba2009-07-12 08:27:39 +0200702 * Returns 1 if done, 0 in case of internal error, eg: lack of resource.
Willy Tarreau1d0dfb12009-07-07 15:10:31 +0200703 */
Willy Tarreaubedb9ba2009-07-12 08:27:39 +0200704int session_set_backend(struct session *s, struct proxy *be)
Willy Tarreau1d0dfb12009-07-07 15:10:31 +0200705{
706 if (s->flags & SN_BE_ASSIGNED)
Willy Tarreaubedb9ba2009-07-12 08:27:39 +0200707 return 1;
Willy Tarreau1d0dfb12009-07-07 15:10:31 +0200708 s->be = be;
709 be->beconn++;
Krzysztof Piotr Oledzki052d4fd2009-10-04 14:52:57 +0200710 if (be->beconn > be->counters.beconn_max)
711 be->counters.beconn_max = be->beconn;
Willy Tarreau1d0dfb12009-07-07 15:10:31 +0200712 proxy_inc_be_ctr(be);
713
714 /* assign new parameters to the session from the new backend */
715 s->rep->rto = s->req->wto = be->timeout.server;
716 s->req->cto = be->timeout.connect;
717 s->conn_retries = be->conn_retries;
Willy Tarreauf27b5ea2009-10-03 22:01:18 +0200718 s->si[1].flags &= ~SI_FL_INDEP_STR;
719 if (be->options2 & PR_O2_INDEPSTR)
720 s->si[1].flags |= SI_FL_INDEP_STR;
721
Willy Tarreau1d0dfb12009-07-07 15:10:31 +0200722 if (be->options2 & PR_O2_RSPBUG_OK)
723 s->txn.rsp.err_pos = -1; /* let buggy responses pass */
724 s->flags |= SN_BE_ASSIGNED;
Willy Tarreau51aecc72009-07-12 09:47:04 +0200725
726 /* If the target backend requires HTTP processing, we have to allocate
727 * a struct hdr_idx for it if we did not have one.
728 */
729 if (unlikely(!s->txn.hdr_idx.v && (be->acl_requires & ACL_USE_L7_ANY))) {
730 if ((s->txn.hdr_idx.v = pool_alloc2(s->fe->hdr_idx_pool)) == NULL)
731 return 0; /* not enough memory */
732 s->txn.hdr_idx.size = MAX_HTTP_HDR;
733 hdr_idx_init(&s->txn.hdr_idx);
734 }
735
Willy Tarreauc1a21672009-08-16 22:37:44 +0200736 /* We want to enable the backend-specific analysers except those which
737 * were already run as part of the frontend/listener. Note that it would
738 * be more reliable to store the list of analysers that have been run,
739 * but what we do here is OK for now.
Emeric Brun647caf12009-06-30 17:57:00 +0200740 */
Willy Tarreauc1a21672009-08-16 22:37:44 +0200741 s->req->analysers |= be->be_req_ana & ~(s->listener->analysers);
Emeric Brun647caf12009-06-30 17:57:00 +0200742
Willy Tarreaubedb9ba2009-07-12 08:27:39 +0200743 return 1;
Willy Tarreau1d0dfb12009-07-07 15:10:31 +0200744}
745
Willy Tarreau9de1bbd2008-07-09 20:34:27 +0200746static struct cfg_kw_list cfg_kws = {{ },{
747 { CFG_LISTEN, "timeout", proxy_parse_timeout },
748 { CFG_LISTEN, "clitimeout", proxy_parse_timeout },
749 { CFG_LISTEN, "contimeout", proxy_parse_timeout },
750 { CFG_LISTEN, "srvtimeout", proxy_parse_timeout },
Willy Tarreau3a7d2072009-03-05 23:48:25 +0100751 { CFG_LISTEN, "rate-limit", proxy_parse_rate_limit },
Willy Tarreau9de1bbd2008-07-09 20:34:27 +0200752 { 0, NULL, NULL },
753}};
754
755__attribute__((constructor))
756static void __proxy_module_init(void)
757{
758 cfg_register_keywords(&cfg_kws);
759}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200760
761/*
762 * Local variables:
763 * c-indent-level: 8
764 * c-basic-offset: 8
765 * End:
766 */