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Willy Tarreaudd815982007-10-16 12:25:14 +02001/*
Willy Tarreaud1d54542012-09-12 22:58:11 +02002 * Listener management functions.
Willy Tarreaudd815982007-10-16 12:25:14 +02003 *
Willy Tarreau0ccb7442013-01-07 22:54:17 +01004 * Copyright 2000-2013 Willy Tarreau <w@1wt.eu>
Willy Tarreaudd815982007-10-16 12:25:14 +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
Willy Tarreau44489252014-01-14 17:52:01 +010013#define _GNU_SOURCE
Willy Tarreau6ae1ba62014-05-07 19:01:58 +020014#include <ctype.h>
Willy Tarreaubbebbbf2012-05-07 21:22:09 +020015#include <errno.h>
Willy Tarreaudd815982007-10-16 12:25:14 +020016#include <stdio.h>
17#include <string.h>
Willy Tarreau95ccdde2014-02-01 09:28:36 +010018#include <unistd.h>
19#include <fcntl.h>
Willy Tarreaudd815982007-10-16 12:25:14 +020020
Willy Tarreau1bc4aab2012-10-08 20:11:03 +020021#include <common/accept4.h>
Willy Tarreaudd815982007-10-16 12:25:14 +020022#include <common/config.h>
Willy Tarreaudabf2e22007-10-28 21:59:24 +010023#include <common/errors.h>
Willy Tarreaudd815982007-10-16 12:25:14 +020024#include <common/mini-clist.h>
25#include <common/standard.h>
Willy Tarreaubbebbbf2012-05-07 21:22:09 +020026#include <common/time.h>
27
28#include <types/global.h>
Willy Tarreaud1d54542012-09-12 22:58:11 +020029#include <types/protocol.h>
Willy Tarreaudd815982007-10-16 12:25:14 +020030
Willy Tarreau645513a2010-05-24 20:55:15 +020031#include <proto/acl.h>
Willy Tarreaub648d632007-10-28 22:13:50 +010032#include <proto/fd.h>
Willy Tarreaubbebbbf2012-05-07 21:22:09 +020033#include <proto/freq_ctr.h>
34#include <proto/log.h>
Willy Tarreau0aa1e332016-04-14 11:13:20 +020035#include <proto/listener.h>
Willy Tarreau0ccb7442013-01-07 22:54:17 +010036#include <proto/sample.h>
Willy Tarreaubbebbbf2012-05-07 21:22:09 +020037#include <proto/task.h>
Willy Tarreaub648d632007-10-28 22:13:50 +010038
Willy Tarreau26982662012-09-12 23:17:10 +020039/* List head of all known bind keywords */
40static struct bind_kw_list bind_keywords = {
41 .list = LIST_HEAD_INIT(bind_keywords.list)
42};
43
Willy Tarreaudabf2e22007-10-28 21:59:24 +010044/* This function adds the specified listener's file descriptor to the polling
45 * lists if it is in the LI_LISTEN state. The listener enters LI_READY or
Willy Tarreauae302532014-05-07 19:22:24 +020046 * LI_FULL state depending on its number of connections. In deamon mode, we
47 * also support binding only the relevant processes to their respective
48 * listeners. We don't do that in debug mode however.
Willy Tarreaudabf2e22007-10-28 21:59:24 +010049 */
50void enable_listener(struct listener *listener)
51{
52 if (listener->state == LI_LISTEN) {
Willy Tarreauae302532014-05-07 19:22:24 +020053 if ((global.mode & (MODE_DAEMON | MODE_SYSTEMD)) &&
54 listener->bind_conf->bind_proc &&
55 !(listener->bind_conf->bind_proc & (1UL << (relative_pid - 1)))) {
56 /* we don't want to enable this listener and don't
57 * want any fd event to reach it.
58 */
Willy Tarreau6f4bf1e2016-04-14 12:05:02 +020059 unbind_listener(listener);
Willy Tarreauae302532014-05-07 19:22:24 +020060 }
61 else if (listener->nbconn < listener->maxconn) {
Willy Tarreau49b046d2012-08-09 12:11:58 +020062 fd_want_recv(listener->fd);
Willy Tarreaudabf2e22007-10-28 21:59:24 +010063 listener->state = LI_READY;
Willy Tarreauae302532014-05-07 19:22:24 +020064 }
65 else {
Willy Tarreaudabf2e22007-10-28 21:59:24 +010066 listener->state = LI_FULL;
67 }
68 }
69}
70
71/* This function removes the specified listener's file descriptor from the
72 * polling lists if it is in the LI_READY or in the LI_FULL state. The listener
73 * enters LI_LISTEN.
74 */
75void disable_listener(struct listener *listener)
76{
77 if (listener->state < LI_READY)
78 return;
79 if (listener->state == LI_READY)
Willy Tarreau49b046d2012-08-09 12:11:58 +020080 fd_stop_recv(listener->fd);
Willy Tarreaue6ca1fc2011-07-24 22:03:52 +020081 if (listener->state == LI_LIMITED)
82 LIST_DEL(&listener->wait_queue);
Willy Tarreaudabf2e22007-10-28 21:59:24 +010083 listener->state = LI_LISTEN;
84}
85
Willy Tarreaube58c382011-07-24 18:28:10 +020086/* This function tries to temporarily disable a listener, depending on the OS
87 * capabilities. Linux unbinds the listen socket after a SHUT_RD, and ignores
88 * SHUT_WR. Solaris refuses either shutdown(). OpenBSD ignores SHUT_RD but
89 * closes upon SHUT_WR and refuses to rebind. So a common validation path
90 * involves SHUT_WR && listen && SHUT_RD. In case of success, the FD's polling
91 * is disabled. It normally returns non-zero, unless an error is reported.
92 */
93int pause_listener(struct listener *l)
94{
95 if (l->state <= LI_PAUSED)
96 return 1;
97
Willy Tarreaud903bb32014-07-07 20:22:12 +020098 if (l->proto->pause) {
99 /* Returns < 0 in case of failure, 0 if the listener
100 * was totally stopped, or > 0 if correctly paused.
101 */
102 int ret = l->proto->pause(l);
Willy Tarreaube58c382011-07-24 18:28:10 +0200103
Willy Tarreaud903bb32014-07-07 20:22:12 +0200104 if (ret < 0)
105 return 0;
106 else if (ret == 0)
107 return 1;
Willy Tarreaub3fb60b2012-10-04 08:56:31 +0200108 }
Willy Tarreaube58c382011-07-24 18:28:10 +0200109
Willy Tarreaue6ca1fc2011-07-24 22:03:52 +0200110 if (l->state == LI_LIMITED)
111 LIST_DEL(&l->wait_queue);
112
Willy Tarreau49b046d2012-08-09 12:11:58 +0200113 fd_stop_recv(l->fd);
Willy Tarreaube58c382011-07-24 18:28:10 +0200114 l->state = LI_PAUSED;
115 return 1;
116}
117
Willy Tarreaue6ca1fc2011-07-24 22:03:52 +0200118/* This function tries to resume a temporarily disabled listener. Paused, full,
119 * limited and disabled listeners are handled, which means that this function
120 * may replace enable_listener(). The resulting state will either be LI_READY
121 * or LI_FULL. 0 is returned in case of failure to resume (eg: dead socket).
Willy Tarreauae302532014-05-07 19:22:24 +0200122 * Listeners bound to a different process are not woken up unless we're in
Willy Tarreau06f823d2015-04-14 12:07:16 +0200123 * foreground mode, and are ignored. If the listener was only in the assigned
124 * state, it's totally rebound. This can happen if a pause() has completely
125 * stopped it. If the resume fails, 0 is returned and an error might be
126 * displayed.
Willy Tarreaube58c382011-07-24 18:28:10 +0200127 */
128int resume_listener(struct listener *l)
129{
Willy Tarreauff120902014-07-07 21:06:24 +0200130 if (l->state == LI_ASSIGNED) {
131 char msg[100];
132 int err;
133
134 err = l->proto->bind(l, msg, sizeof(msg));
135 if (err & ERR_ALERT)
136 Alert("Resuming listener: %s\n", msg);
137 else if (err & ERR_WARN)
138 Warning("Resuming listener: %s\n", msg);
139
140 if (err & (ERR_FATAL | ERR_ABORT))
141 return 0;
142 }
143
Willy Tarreaube58c382011-07-24 18:28:10 +0200144 if (l->state < LI_PAUSED)
145 return 0;
146
Willy Tarreauae302532014-05-07 19:22:24 +0200147 if ((global.mode & (MODE_DAEMON | MODE_SYSTEMD)) &&
148 l->bind_conf->bind_proc &&
149 !(l->bind_conf->bind_proc & (1UL << (relative_pid - 1))))
Willy Tarreau06f823d2015-04-14 12:07:16 +0200150 return 1;
Willy Tarreauae302532014-05-07 19:22:24 +0200151
Willy Tarreaub3fb60b2012-10-04 08:56:31 +0200152 if (l->proto->sock_prot == IPPROTO_TCP &&
153 l->state == LI_PAUSED &&
Willy Tarreaube58c382011-07-24 18:28:10 +0200154 listen(l->fd, l->backlog ? l->backlog : l->maxconn) != 0)
155 return 0;
156
157 if (l->state == LI_READY)
158 return 1;
159
Willy Tarreaue6ca1fc2011-07-24 22:03:52 +0200160 if (l->state == LI_LIMITED)
161 LIST_DEL(&l->wait_queue);
162
Willy Tarreaube58c382011-07-24 18:28:10 +0200163 if (l->nbconn >= l->maxconn) {
164 l->state = LI_FULL;
165 return 1;
166 }
167
Willy Tarreau49b046d2012-08-09 12:11:58 +0200168 fd_want_recv(l->fd);
Willy Tarreaube58c382011-07-24 18:28:10 +0200169 l->state = LI_READY;
170 return 1;
171}
172
Willy Tarreau62793712011-07-24 19:23:38 +0200173/* Marks a ready listener as full so that the session code tries to re-enable
174 * it upon next close() using resume_listener().
175 */
176void listener_full(struct listener *l)
177{
178 if (l->state >= LI_READY) {
Willy Tarreaue6ca1fc2011-07-24 22:03:52 +0200179 if (l->state == LI_LIMITED)
180 LIST_DEL(&l->wait_queue);
181
Willy Tarreau49b046d2012-08-09 12:11:58 +0200182 fd_stop_recv(l->fd);
Willy Tarreau62793712011-07-24 19:23:38 +0200183 l->state = LI_FULL;
184 }
185}
186
Willy Tarreaue6ca1fc2011-07-24 22:03:52 +0200187/* Marks a ready listener as limited so that we only try to re-enable it when
188 * resources are free again. It will be queued into the specified queue.
189 */
190void limit_listener(struct listener *l, struct list *list)
191{
192 if (l->state == LI_READY) {
193 LIST_ADDQ(list, &l->wait_queue);
Willy Tarreau49b046d2012-08-09 12:11:58 +0200194 fd_stop_recv(l->fd);
Willy Tarreaue6ca1fc2011-07-24 22:03:52 +0200195 l->state = LI_LIMITED;
196 }
197}
198
Willy Tarreaudabf2e22007-10-28 21:59:24 +0100199/* This function adds all of the protocol's listener's file descriptors to the
200 * polling lists when they are in the LI_LISTEN state. It is intended to be
201 * used as a protocol's generic enable_all() primitive, for use after the
202 * fork(). It puts the listeners into LI_READY or LI_FULL states depending on
203 * their number of connections. It always returns ERR_NONE.
204 */
205int enable_all_listeners(struct protocol *proto)
206{
207 struct listener *listener;
208
209 list_for_each_entry(listener, &proto->listeners, proto_list)
210 enable_listener(listener);
211 return ERR_NONE;
212}
213
214/* This function removes all of the protocol's listener's file descriptors from
215 * the polling lists when they are in the LI_READY or LI_FULL states. It is
216 * intended to be used as a protocol's generic disable_all() primitive. It puts
217 * the listeners into LI_LISTEN, and always returns ERR_NONE.
218 */
219int disable_all_listeners(struct protocol *proto)
220{
221 struct listener *listener;
222
223 list_for_each_entry(listener, &proto->listeners, proto_list)
224 disable_listener(listener);
225 return ERR_NONE;
226}
227
Willy Tarreaue6ca1fc2011-07-24 22:03:52 +0200228/* Dequeues all of the listeners waiting for a resource in wait queue <queue>. */
229void dequeue_all_listeners(struct list *list)
230{
231 struct listener *listener, *l_back;
232
233 list_for_each_entry_safe(listener, l_back, list, wait_queue) {
234 /* This cannot fail because the listeners are by definition in
235 * the LI_LIMITED state. The function also removes the entry
236 * from the queue.
237 */
238 resume_listener(listener);
239 }
240}
241
Willy Tarreaub648d632007-10-28 22:13:50 +0100242/* This function closes the listening socket for the specified listener,
243 * provided that it's already in a listening state. The listener enters the
244 * LI_ASSIGNED state. It always returns ERR_NONE. This function is intended
245 * to be used as a generic function for standard protocols.
246 */
247int unbind_listener(struct listener *listener)
248{
249 if (listener->state == LI_READY)
Willy Tarreau49b046d2012-08-09 12:11:58 +0200250 fd_stop_recv(listener->fd);
Willy Tarreaub648d632007-10-28 22:13:50 +0100251
Willy Tarreaue6ca1fc2011-07-24 22:03:52 +0200252 if (listener->state == LI_LIMITED)
253 LIST_DEL(&listener->wait_queue);
254
Willy Tarreaube58c382011-07-24 18:28:10 +0200255 if (listener->state >= LI_PAUSED) {
Willy Tarreaub648d632007-10-28 22:13:50 +0100256 fd_delete(listener->fd);
Willy Tarreaufb8bf632014-07-07 18:24:48 +0200257 listener->fd = -1;
Willy Tarreaub648d632007-10-28 22:13:50 +0100258 listener->state = LI_ASSIGNED;
259 }
260 return ERR_NONE;
261}
262
Willy Tarreau3acf8c32007-10-28 22:35:41 +0100263/* This function closes all listening sockets bound to the protocol <proto>,
264 * and the listeners end in LI_ASSIGNED state if they were higher. It does not
265 * detach them from the protocol. It always returns ERR_NONE.
266 */
267int unbind_all_listeners(struct protocol *proto)
268{
269 struct listener *listener;
270
271 list_for_each_entry(listener, &proto->listeners, proto_list)
272 unbind_listener(listener);
273 return ERR_NONE;
274}
275
Willy Tarreau1a64d162007-10-28 22:26:05 +0100276/* Delete a listener from its protocol's list of listeners. The listener's
277 * state is automatically updated from LI_ASSIGNED to LI_INIT. The protocol's
278 * number of listeners is updated. Note that the listener must have previously
279 * been unbound. This is the generic function to use to remove a listener.
280 */
281void delete_listener(struct listener *listener)
282{
283 if (listener->state != LI_ASSIGNED)
284 return;
285 listener->state = LI_INIT;
286 LIST_DEL(&listener->proto_list);
287 listener->proto->nb_listeners--;
288}
289
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200290/* This function is called on a read event from a listening socket, corresponding
291 * to an accept. It tries to accept as many connections as possible, and for each
292 * calls the listener's accept handler (generally the frontend's accept handler).
293 */
Willy Tarreauafad0e02012-08-09 14:45:22 +0200294void listener_accept(int fd)
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200295{
296 struct listener *l = fdtab[fd].owner;
297 struct proxy *p = l->frontend;
Willy Tarreau50de90a2012-11-23 20:11:45 +0100298 int max_accept = l->maxaccept ? l->maxaccept : 1;
Willy Tarreaubb660302014-05-07 19:47:02 +0200299 int expire;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200300 int cfd;
301 int ret;
Willy Tarreau818dca52014-01-31 19:40:19 +0100302#ifdef USE_ACCEPT4
303 static int accept4_broken;
304#endif
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200305
306 if (unlikely(l->nbconn >= l->maxconn)) {
307 listener_full(l);
Willy Tarreauafad0e02012-08-09 14:45:22 +0200308 return;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200309 }
310
Willy Tarreau93e7c002013-10-07 18:51:07 +0200311 if (!(l->options & LI_O_UNLIMITED) && global.sps_lim) {
312 int max = freq_ctr_remain(&global.sess_per_sec, global.sps_lim, 0);
Willy Tarreau93e7c002013-10-07 18:51:07 +0200313
314 if (unlikely(!max)) {
315 /* frontend accept rate limit was reached */
Willy Tarreau93e7c002013-10-07 18:51:07 +0200316 expire = tick_add(now_ms, next_event_delay(&global.sess_per_sec, global.sps_lim, 0));
Willy Tarreaubb660302014-05-07 19:47:02 +0200317 goto wait_expire;
Willy Tarreau93e7c002013-10-07 18:51:07 +0200318 }
319
320 if (max_accept > max)
321 max_accept = max;
322 }
323
324 if (!(l->options & LI_O_UNLIMITED) && global.cps_lim) {
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200325 int max = freq_ctr_remain(&global.conn_per_sec, global.cps_lim, 0);
326
327 if (unlikely(!max)) {
328 /* frontend accept rate limit was reached */
Willy Tarreau93e7c002013-10-07 18:51:07 +0200329 expire = tick_add(now_ms, next_event_delay(&global.conn_per_sec, global.cps_lim, 0));
Willy Tarreaubb660302014-05-07 19:47:02 +0200330 goto wait_expire;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200331 }
332
333 if (max_accept > max)
334 max_accept = max;
335 }
Willy Tarreaue43d5322013-10-07 20:01:52 +0200336#ifdef USE_OPENSSL
337 if (!(l->options & LI_O_UNLIMITED) && global.ssl_lim && l->bind_conf && l->bind_conf->is_ssl) {
338 int max = freq_ctr_remain(&global.ssl_per_sec, global.ssl_lim, 0);
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200339
Willy Tarreaue43d5322013-10-07 20:01:52 +0200340 if (unlikely(!max)) {
341 /* frontend accept rate limit was reached */
Willy Tarreaue43d5322013-10-07 20:01:52 +0200342 expire = tick_add(now_ms, next_event_delay(&global.ssl_per_sec, global.ssl_lim, 0));
Willy Tarreaubb660302014-05-07 19:47:02 +0200343 goto wait_expire;
Willy Tarreaue43d5322013-10-07 20:01:52 +0200344 }
345
346 if (max_accept > max)
347 max_accept = max;
348 }
349#endif
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200350 if (p && p->fe_sps_lim) {
351 int max = freq_ctr_remain(&p->fe_sess_per_sec, p->fe_sps_lim, 0);
352
353 if (unlikely(!max)) {
354 /* frontend accept rate limit was reached */
355 limit_listener(l, &p->listener_queue);
356 task_schedule(p->task, tick_add(now_ms, next_event_delay(&p->fe_sess_per_sec, p->fe_sps_lim, 0)));
Willy Tarreauafad0e02012-08-09 14:45:22 +0200357 return;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200358 }
359
360 if (max_accept > max)
361 max_accept = max;
362 }
363
364 /* Note: if we fail to allocate a connection because of configured
365 * limits, we'll schedule a new attempt worst 1 second later in the
366 * worst case. If we fail due to system limits or temporary resource
367 * shortage, we try again 100ms later in the worst case.
368 */
369 while (max_accept--) {
370 struct sockaddr_storage addr;
371 socklen_t laddr = sizeof(addr);
372
373 if (unlikely(actconn >= global.maxconn) && !(l->options & LI_O_UNLIMITED)) {
374 limit_listener(l, &global_listener_queue);
375 task_schedule(global_listener_queue_task, tick_add(now_ms, 1000)); /* try again in 1 second */
Willy Tarreauafad0e02012-08-09 14:45:22 +0200376 return;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200377 }
378
379 if (unlikely(p && p->feconn >= p->maxconn)) {
380 limit_listener(l, &p->listener_queue);
Willy Tarreauafad0e02012-08-09 14:45:22 +0200381 return;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200382 }
383
Willy Tarreau1bc4aab2012-10-08 20:11:03 +0200384#ifdef USE_ACCEPT4
Willy Tarreau818dca52014-01-31 19:40:19 +0100385 /* only call accept4() if it's known to be safe, otherwise
386 * fallback to the legacy accept() + fcntl().
387 */
388 if (unlikely(accept4_broken ||
389 ((cfd = accept4(fd, (struct sockaddr *)&addr, &laddr, SOCK_NONBLOCK)) == -1 &&
390 (errno == ENOSYS || errno == EINVAL || errno == EBADF) &&
391 (accept4_broken = 1))))
392#endif
Willy Tarreau6b3b0d42012-10-22 19:32:55 +0200393 if ((cfd = accept(fd, (struct sockaddr *)&addr, &laddr)) != -1)
394 fcntl(cfd, F_SETFL, O_NONBLOCK);
Willy Tarreau818dca52014-01-31 19:40:19 +0100395
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200396 if (unlikely(cfd == -1)) {
397 switch (errno) {
398 case EAGAIN:
Willy Tarreaubb660302014-05-07 19:47:02 +0200399 if (fdtab[fd].ev & FD_POLL_HUP) {
400 /* the listening socket might have been disabled in a shared
401 * process and we're a collateral victim. We'll just pause for
402 * a while in case it comes back. In the mean time, we need to
403 * clear this sticky flag.
404 */
405 fdtab[fd].ev &= ~FD_POLL_HUP;
406 goto transient_error;
407 }
Willy Tarreauf817e9f2014-01-10 16:58:45 +0100408 fd_cant_recv(fd);
Willy Tarreauafad0e02012-08-09 14:45:22 +0200409 return; /* nothing more to accept */
Willy Tarreaubb660302014-05-07 19:47:02 +0200410 case EINVAL:
411 /* might be trying to accept on a shut fd (eg: soft stop) */
412 goto transient_error;
Willy Tarreaua593ec52014-01-20 21:21:30 +0100413 case EINTR:
414 case ECONNABORTED:
415 continue;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200416 case ENFILE:
417 if (p)
418 send_log(p, LOG_EMERG,
419 "Proxy %s reached system FD limit at %d. Please check system tunables.\n",
420 p->id, maxfd);
Willy Tarreaubb660302014-05-07 19:47:02 +0200421 goto transient_error;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200422 case EMFILE:
423 if (p)
424 send_log(p, LOG_EMERG,
425 "Proxy %s reached process FD limit at %d. Please check 'ulimit-n' and restart.\n",
426 p->id, maxfd);
Willy Tarreaubb660302014-05-07 19:47:02 +0200427 goto transient_error;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200428 case ENOBUFS:
429 case ENOMEM:
430 if (p)
431 send_log(p, LOG_EMERG,
432 "Proxy %s reached system memory limit at %d sockets. Please check system tunables.\n",
433 p->id, maxfd);
Willy Tarreaubb660302014-05-07 19:47:02 +0200434 goto transient_error;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200435 default:
Willy Tarreaua593ec52014-01-20 21:21:30 +0100436 /* unexpected result, let's give up and let other tasks run */
Willy Tarreau6c11bd22014-01-24 00:54:27 +0100437 goto stop;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200438 }
439 }
440
441 if (unlikely(cfd >= global.maxsock)) {
442 send_log(p, LOG_EMERG,
443 "Proxy %s reached the configured maximum connection limit. Please check the global 'maxconn' value.\n",
444 p->id);
445 close(cfd);
446 limit_listener(l, &global_listener_queue);
447 task_schedule(global_listener_queue_task, tick_add(now_ms, 1000)); /* try again in 1 second */
Willy Tarreauafad0e02012-08-09 14:45:22 +0200448 return;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200449 }
450
451 /* increase the per-process number of cumulated connections */
452 if (!(l->options & LI_O_UNLIMITED)) {
453 update_freq_ctr(&global.conn_per_sec, 1);
454 if (global.conn_per_sec.curr_ctr > global.cps_max)
455 global.cps_max = global.conn_per_sec.curr_ctr;
456 actconn++;
457 }
458
459 jobs++;
460 totalconn++;
461 l->nbconn++;
462
463 if (l->counters) {
464 if (l->nbconn > l->counters->conn_max)
465 l->counters->conn_max = l->nbconn;
466 }
467
468 ret = l->accept(l, cfd, &addr);
469 if (unlikely(ret <= 0)) {
470 /* The connection was closed by session_accept(). Either
471 * we just have to ignore it (ret == 0) or it's a critical
472 * error due to a resource shortage, and we must stop the
473 * listener (ret < 0).
474 */
475 if (!(l->options & LI_O_UNLIMITED))
476 actconn--;
477 jobs--;
478 l->nbconn--;
479 if (ret == 0) /* successful termination */
480 continue;
481
Willy Tarreaubb660302014-05-07 19:47:02 +0200482 goto transient_error;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200483 }
484
485 if (l->nbconn >= l->maxconn) {
486 listener_full(l);
Willy Tarreauafad0e02012-08-09 14:45:22 +0200487 return;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200488 }
489
Willy Tarreau93e7c002013-10-07 18:51:07 +0200490 /* increase the per-process number of cumulated connections */
491 if (!(l->options & LI_O_UNLIMITED)) {
492 update_freq_ctr(&global.sess_per_sec, 1);
493 if (global.sess_per_sec.curr_ctr > global.sps_max)
494 global.sps_max = global.sess_per_sec.curr_ctr;
495 }
Willy Tarreaue43d5322013-10-07 20:01:52 +0200496#ifdef USE_OPENSSL
497 if (!(l->options & LI_O_UNLIMITED) && l->bind_conf && l->bind_conf->is_ssl) {
498
499 update_freq_ctr(&global.ssl_per_sec, 1);
500 if (global.ssl_per_sec.curr_ctr > global.ssl_max)
501 global.ssl_max = global.ssl_per_sec.curr_ctr;
502 }
503#endif
Willy Tarreau93e7c002013-10-07 18:51:07 +0200504
Willy Tarreauaece46a2012-07-06 12:25:58 +0200505 } /* end of while (max_accept--) */
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200506
Willy Tarreauaece46a2012-07-06 12:25:58 +0200507 /* we've exhausted max_accept, so there is no need to poll again */
Willy Tarreau6c11bd22014-01-24 00:54:27 +0100508 stop:
509 fd_done_recv(fd);
Willy Tarreauafad0e02012-08-09 14:45:22 +0200510 return;
Willy Tarreaubb660302014-05-07 19:47:02 +0200511
512 transient_error:
513 /* pause the listener and try again in 100 ms */
514 expire = tick_add(now_ms, 100);
515
516 wait_expire:
517 limit_listener(l, &global_listener_queue);
518 task_schedule(global_listener_queue_task, tick_first(expire, global_listener_queue_task->expire));
519 return;
Willy Tarreaubbebbbf2012-05-07 21:22:09 +0200520}
521
Willy Tarreau26982662012-09-12 23:17:10 +0200522/*
523 * Registers the bind keyword list <kwl> as a list of valid keywords for next
524 * parsing sessions.
525 */
526void bind_register_keywords(struct bind_kw_list *kwl)
527{
528 LIST_ADDQ(&bind_keywords.list, &kwl->list);
529}
530
531/* Return a pointer to the bind keyword <kw>, or NULL if not found. If the
532 * keyword is found with a NULL ->parse() function, then an attempt is made to
533 * find one with a valid ->parse() function. This way it is possible to declare
534 * platform-dependant, known keywords as NULL, then only declare them as valid
535 * if some options are met. Note that if the requested keyword contains an
536 * opening parenthesis, everything from this point is ignored.
537 */
538struct bind_kw *bind_find_kw(const char *kw)
539{
540 int index;
541 const char *kwend;
542 struct bind_kw_list *kwl;
543 struct bind_kw *ret = NULL;
544
545 kwend = strchr(kw, '(');
546 if (!kwend)
547 kwend = kw + strlen(kw);
548
549 list_for_each_entry(kwl, &bind_keywords.list, list) {
550 for (index = 0; kwl->kw[index].kw != NULL; index++) {
551 if ((strncmp(kwl->kw[index].kw, kw, kwend - kw) == 0) &&
552 kwl->kw[index].kw[kwend-kw] == 0) {
553 if (kwl->kw[index].parse)
554 return &kwl->kw[index]; /* found it !*/
555 else
556 ret = &kwl->kw[index]; /* may be OK */
557 }
558 }
559 }
560 return ret;
561}
562
Willy Tarreau8638f482012-09-18 18:01:17 +0200563/* Dumps all registered "bind" keywords to the <out> string pointer. The
564 * unsupported keywords are only dumped if their supported form was not
565 * found.
566 */
567void bind_dump_kws(char **out)
568{
569 struct bind_kw_list *kwl;
570 int index;
571
572 *out = NULL;
573 list_for_each_entry(kwl, &bind_keywords.list, list) {
574 for (index = 0; kwl->kw[index].kw != NULL; index++) {
575 if (kwl->kw[index].parse ||
576 bind_find_kw(kwl->kw[index].kw) == &kwl->kw[index]) {
Willy Tarreau51fb7652012-09-18 18:24:39 +0200577 memprintf(out, "%s[%4s] %s%s%s\n", *out ? *out : "",
578 kwl->scope,
Willy Tarreau8638f482012-09-18 18:01:17 +0200579 kwl->kw[index].kw,
Willy Tarreau51fb7652012-09-18 18:24:39 +0200580 kwl->kw[index].skip ? " <arg>" : "",
581 kwl->kw[index].parse ? "" : " (not supported)");
Willy Tarreau8638f482012-09-18 18:01:17 +0200582 }
583 }
584 }
585}
586
Willy Tarreau645513a2010-05-24 20:55:15 +0200587/************************************************************************/
Willy Tarreau0ccb7442013-01-07 22:54:17 +0100588/* All supported sample and ACL keywords must be declared here. */
Willy Tarreau645513a2010-05-24 20:55:15 +0200589/************************************************************************/
590
Willy Tarreaua5e37562011-12-16 17:06:15 +0100591/* set temp integer to the number of connexions to the same listening socket */
Willy Tarreau645513a2010-05-24 20:55:15 +0200592static int
Willy Tarreau0ccb7442013-01-07 22:54:17 +0100593smp_fetch_dconn(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +0200594 const struct arg *args, struct sample *smp, const char *kw)
Willy Tarreau645513a2010-05-24 20:55:15 +0200595{
Willy Tarreauf853c462012-04-23 18:53:56 +0200596 smp->type = SMP_T_UINT;
597 smp->data.uint = l4->listener->nbconn;
Willy Tarreau645513a2010-05-24 20:55:15 +0200598 return 1;
599}
600
Willy Tarreaua5e37562011-12-16 17:06:15 +0100601/* set temp integer to the id of the socket (listener) */
Willy Tarreau645513a2010-05-24 20:55:15 +0200602static int
Willy Tarreau0ccb7442013-01-07 22:54:17 +0100603smp_fetch_so_id(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
Willy Tarreauef38c392013-07-22 16:29:32 +0200604 const struct arg *args, struct sample *smp, const char *kw)
Willy Tarreau37406352012-04-23 16:16:37 +0200605{
Willy Tarreauf853c462012-04-23 18:53:56 +0200606 smp->type = SMP_T_UINT;
607 smp->data.uint = l4->listener->luid;
Willy Tarreau645513a2010-05-24 20:55:15 +0200608 return 1;
609}
610
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200611/* parse the "accept-proxy" bind keyword */
Willy Tarreau4348fad2012-09-20 16:48:07 +0200612static int bind_parse_accept_proxy(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200613{
614 struct listener *l;
615
Willy Tarreau4348fad2012-09-20 16:48:07 +0200616 list_for_each_entry(l, &conf->listeners, by_bind)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200617 l->options |= LI_O_ACC_PROXY;
618
619 return 0;
620}
621
622/* parse the "backlog" bind keyword */
Willy Tarreau4348fad2012-09-20 16:48:07 +0200623static int bind_parse_backlog(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200624{
625 struct listener *l;
626 int val;
627
628 if (!*args[cur_arg + 1]) {
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200629 memprintf(err, "'%s' : missing value", args[cur_arg]);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200630 return ERR_ALERT | ERR_FATAL;
631 }
632
633 val = atol(args[cur_arg + 1]);
634 if (val <= 0) {
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200635 memprintf(err, "'%s' : invalid value %d, must be > 0", args[cur_arg], val);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200636 return ERR_ALERT | ERR_FATAL;
637 }
638
Willy Tarreau4348fad2012-09-20 16:48:07 +0200639 list_for_each_entry(l, &conf->listeners, by_bind)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200640 l->backlog = val;
641
642 return 0;
643}
644
645/* parse the "id" bind keyword */
Willy Tarreau4348fad2012-09-20 16:48:07 +0200646static int bind_parse_id(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200647{
648 struct eb32_node *node;
Willy Tarreau4348fad2012-09-20 16:48:07 +0200649 struct listener *l, *new;
Thierry Fournierd357edf2016-02-26 08:45:58 +0100650 char *error;
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200651
Willy Tarreau4348fad2012-09-20 16:48:07 +0200652 if (conf->listeners.n != conf->listeners.p) {
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200653 memprintf(err, "'%s' can only be used with a single socket", args[cur_arg]);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200654 return ERR_ALERT | ERR_FATAL;
655 }
656
657 if (!*args[cur_arg + 1]) {
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200658 memprintf(err, "'%s' : expects an integer argument", args[cur_arg]);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200659 return ERR_ALERT | ERR_FATAL;
660 }
661
Willy Tarreau4348fad2012-09-20 16:48:07 +0200662 new = LIST_NEXT(&conf->listeners, struct listener *, by_bind);
Thierry Fournierd357edf2016-02-26 08:45:58 +0100663 new->luid = strtol(args[cur_arg + 1], &error, 10);
664 if (*error != '\0') {
665 memprintf(err, "'%s' : expects an integer argument, found '%s'", args[cur_arg], args[cur_arg + 1]);
666 return ERR_ALERT | ERR_FATAL;
667 }
Willy Tarreau4348fad2012-09-20 16:48:07 +0200668 new->conf.id.key = new->luid;
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200669
Willy Tarreau4348fad2012-09-20 16:48:07 +0200670 if (new->luid <= 0) {
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200671 memprintf(err, "'%s' : custom id has to be > 0", args[cur_arg]);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200672 return ERR_ALERT | ERR_FATAL;
673 }
674
Willy Tarreau4348fad2012-09-20 16:48:07 +0200675 node = eb32_lookup(&px->conf.used_listener_id, new->luid);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200676 if (node) {
677 l = container_of(node, struct listener, conf.id);
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200678 memprintf(err, "'%s' : custom id %d already used at %s:%d ('bind %s')",
679 args[cur_arg], l->luid, l->bind_conf->file, l->bind_conf->line,
680 l->bind_conf->arg);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200681 return ERR_ALERT | ERR_FATAL;
682 }
683
Willy Tarreau4348fad2012-09-20 16:48:07 +0200684 eb32_insert(&px->conf.used_listener_id, &new->conf.id);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200685 return 0;
686}
687
688/* parse the "maxconn" bind keyword */
Willy Tarreau4348fad2012-09-20 16:48:07 +0200689static int bind_parse_maxconn(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200690{
691 struct listener *l;
692 int val;
693
694 if (!*args[cur_arg + 1]) {
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200695 memprintf(err, "'%s' : missing value", args[cur_arg]);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200696 return ERR_ALERT | ERR_FATAL;
697 }
698
699 val = atol(args[cur_arg + 1]);
700 if (val <= 0) {
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200701 memprintf(err, "'%s' : invalid value %d, must be > 0", args[cur_arg], val);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200702 return ERR_ALERT | ERR_FATAL;
703 }
704
Willy Tarreau4348fad2012-09-20 16:48:07 +0200705 list_for_each_entry(l, &conf->listeners, by_bind)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200706 l->maxconn = val;
707
708 return 0;
709}
710
711/* parse the "name" bind keyword */
Willy Tarreau4348fad2012-09-20 16:48:07 +0200712static int bind_parse_name(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200713{
714 struct listener *l;
715
716 if (!*args[cur_arg + 1]) {
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200717 memprintf(err, "'%s' : missing name", args[cur_arg]);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200718 return ERR_ALERT | ERR_FATAL;
719 }
720
Willy Tarreau4348fad2012-09-20 16:48:07 +0200721 list_for_each_entry(l, &conf->listeners, by_bind)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200722 l->name = strdup(args[cur_arg + 1]);
723
724 return 0;
725}
726
727/* parse the "nice" bind keyword */
Willy Tarreau4348fad2012-09-20 16:48:07 +0200728static int bind_parse_nice(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200729{
730 struct listener *l;
731 int val;
732
733 if (!*args[cur_arg + 1]) {
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200734 memprintf(err, "'%s' : missing value", args[cur_arg]);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200735 return ERR_ALERT | ERR_FATAL;
736 }
737
738 val = atol(args[cur_arg + 1]);
739 if (val < -1024 || val > 1024) {
Willy Tarreaueb6cead2012-09-20 19:43:14 +0200740 memprintf(err, "'%s' : invalid value %d, allowed range is -1024..1024", args[cur_arg], val);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200741 return ERR_ALERT | ERR_FATAL;
742 }
743
Willy Tarreau4348fad2012-09-20 16:48:07 +0200744 list_for_each_entry(l, &conf->listeners, by_bind)
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200745 l->nice = val;
746
747 return 0;
748}
749
Willy Tarreau6ae1ba62014-05-07 19:01:58 +0200750/* parse the "process" bind keyword */
751static int bind_parse_process(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
752{
753 unsigned long set = 0;
754 unsigned int low, high;
755
756 if (strcmp(args[cur_arg + 1], "all") == 0) {
757 set = 0;
758 }
759 else if (strcmp(args[cur_arg + 1], "odd") == 0) {
760 set |= ~0UL/3UL; /* 0x555....555 */
761 }
762 else if (strcmp(args[cur_arg + 1], "even") == 0) {
763 set |= (~0UL/3UL) << 1; /* 0xAAA...AAA */
764 }
765 else if (isdigit((int)*args[cur_arg + 1])) {
766 char *dash = strchr(args[cur_arg + 1], '-');
767
768 low = high = str2uic(args[cur_arg + 1]);
769 if (dash)
770 high = str2uic(dash + 1);
771
772 if (high < low) {
773 unsigned int swap = low;
774 low = high;
775 high = swap;
776 }
777
778 if (low < 1 || high > LONGBITS) {
779 memprintf(err, "'%s' : invalid range %d-%d, allowed range is 1..%d", args[cur_arg], low, high, LONGBITS);
780 return ERR_ALERT | ERR_FATAL;
781 }
782 while (low <= high)
783 set |= 1UL << (low++ - 1);
784 }
785 else {
786 memprintf(err, "'%s' expects 'all', 'odd', 'even', or a process range with numbers from 1 to %d.", args[cur_arg], LONGBITS);
787 return ERR_ALERT | ERR_FATAL;
788 }
789
790 conf->bind_proc = set;
791 return 0;
792}
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200793
Willy Tarreau61612d42012-04-19 18:42:05 +0200794/* Note: must not be declared <const> as its list will be overwritten.
795 * Please take care of keeping this list alphabetically sorted.
796 */
Willy Tarreaudc13c112013-06-21 23:16:39 +0200797static struct sample_fetch_kw_list smp_kws = {ILH, {
Willy Tarreau0ccb7442013-01-07 22:54:17 +0100798 { "dst_conn", smp_fetch_dconn, 0, NULL, SMP_T_UINT, SMP_USE_FTEND, },
799 { "so_id", smp_fetch_so_id, 0, NULL, SMP_T_UINT, SMP_USE_FTEND, },
800 { /* END */ },
801}};
802
803/* Note: must not be declared <const> as its list will be overwritten.
804 * Please take care of keeping this list alphabetically sorted.
805 */
Willy Tarreaudc13c112013-06-21 23:16:39 +0200806static struct acl_kw_list acl_kws = {ILH, {
Willy Tarreau0ccb7442013-01-07 22:54:17 +0100807 { /* END */ },
Willy Tarreau645513a2010-05-24 20:55:15 +0200808}};
809
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200810/* Note: must not be declared <const> as its list will be overwritten.
811 * Please take care of keeping this list alphabetically sorted, doing so helps
812 * all code contributors.
813 * Optional keywords are also declared with a NULL ->parse() function so that
814 * the config parser can report an appropriate error when a known keyword was
815 * not enabled.
816 */
Willy Tarreau51fb7652012-09-18 18:24:39 +0200817static struct bind_kw_list bind_kws = { "ALL", { }, {
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200818 { "accept-proxy", bind_parse_accept_proxy, 0 }, /* enable PROXY protocol */
819 { "backlog", bind_parse_backlog, 1 }, /* set backlog of listening socket */
820 { "id", bind_parse_id, 1 }, /* set id of listening socket */
821 { "maxconn", bind_parse_maxconn, 1 }, /* set maxconn of listening socket */
822 { "name", bind_parse_name, 1 }, /* set name of listening socket */
823 { "nice", bind_parse_nice, 1 }, /* set nice of listening socket */
Willy Tarreau6ae1ba62014-05-07 19:01:58 +0200824 { "process", bind_parse_process, 1 }, /* set list of allowed process for this socket */
Willy Tarreau0ccb7442013-01-07 22:54:17 +0100825 { /* END */ },
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200826}};
827
Willy Tarreau645513a2010-05-24 20:55:15 +0200828__attribute__((constructor))
Willy Tarreaud1d54542012-09-12 22:58:11 +0200829static void __listener_init(void)
Willy Tarreau645513a2010-05-24 20:55:15 +0200830{
Willy Tarreau0ccb7442013-01-07 22:54:17 +0100831 sample_register_fetches(&smp_kws);
Willy Tarreau645513a2010-05-24 20:55:15 +0200832 acl_register_keywords(&acl_kws);
Willy Tarreau3dcc3412012-09-18 17:17:28 +0200833 bind_register_keywords(&bind_kws);
Willy Tarreau645513a2010-05-24 20:55:15 +0200834}
835
836/*
837 * Local variables:
838 * c-indent-level: 8
839 * c-basic-offset: 8
840 * End:
841 */