blob: 61349fef760e788dd60a0e484492e250ea0ea219 [file] [log] [blame]
Willy Tarreaubaaee002006-06-26 02:48:02 +02001/*
2 * Health-checks functions.
3 *
Willy Tarreau26c25062009-03-08 09:38:41 +01004 * Copyright 2000-2009 Willy Tarreau <w@1wt.eu>
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +02005 * Copyright 2007-2009 Krzysztof Piotr Oledzki <ole@ans.pl>
Willy Tarreaubaaee002006-06-26 02:48:02 +02006 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 */
13
Willy Tarreaub8816082008-01-18 12:18:15 +010014#include <assert.h>
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +020015#include <ctype.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020016#include <errno.h>
17#include <fcntl.h>
18#include <stdio.h>
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +020019#include <stdlib.h>
Willy Tarreau2dd0d472006-06-29 17:53:05 +020020#include <string.h>
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +020021#include <time.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020022#include <unistd.h>
23#include <sys/socket.h>
Dmitry Sivachenkocaf58982009-08-24 15:11:06 +040024#include <sys/types.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020025#include <netinet/in.h>
Willy Tarreau1274bc42009-07-15 07:16:31 +020026#include <netinet/tcp.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020027#include <arpa/inet.h>
28
Willy Tarreau2dd0d472006-06-29 17:53:05 +020029#include <common/compat.h>
30#include <common/config.h>
31#include <common/mini-clist.h>
Willy Tarreau83749182007-04-15 20:56:27 +020032#include <common/standard.h>
Willy Tarreau2dd0d472006-06-29 17:53:05 +020033#include <common/time.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020034
35#include <types/global.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020036
37#include <proto/backend.h>
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +020038#include <proto/checks.h>
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +010039#include <proto/buffers.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020040#include <proto/fd.h>
41#include <proto/log.h>
42#include <proto/queue.h>
Willy Tarreauc6f4ce82009-06-10 11:09:37 +020043#include <proto/port_range.h>
Willy Tarreau3d300592007-03-18 18:34:41 +010044#include <proto/proto_http.h>
Willy Tarreaue8c66af2008-01-13 18:40:14 +010045#include <proto/proto_tcp.h>
Willy Tarreau2b5652f2006-12-31 17:46:05 +010046#include <proto/proxy.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020047#include <proto/server.h>
48#include <proto/task.h>
49
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +020050const struct check_status check_statuses[HCHK_STATUS_SIZE] = {
51 [HCHK_STATUS_UNKNOWN] = { SRV_CHK_UNKNOWN, "UNK", "Unknown" },
52 [HCHK_STATUS_INI] = { SRV_CHK_UNKNOWN, "INI", "Initializing" },
53 [HCHK_STATUS_START] = { /* SPECIAL STATUS*/ },
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +020054
Krzysztof Piotr Oledzki97f07b82009-12-15 22:31:24 +010055 [HCHK_STATUS_HANA] = { SRV_CHK_ERROR, "HANA", "Health analyze" },
56
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +020057 [HCHK_STATUS_SOCKERR] = { SRV_CHK_ERROR, "SOCKERR", "Socket error" },
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +020058
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +020059 [HCHK_STATUS_L4OK] = { SRV_CHK_RUNNING, "L4OK", "Layer4 check passed" },
60 [HCHK_STATUS_L4TOUT] = { SRV_CHK_ERROR, "L4TOUT", "Layer4 timeout" },
61 [HCHK_STATUS_L4CON] = { SRV_CHK_ERROR, "L4CON", "Layer4 connection problem" },
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +020062
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +020063 [HCHK_STATUS_L6OK] = { SRV_CHK_RUNNING, "L6OK", "Layer6 check passed" },
64 [HCHK_STATUS_L6TOUT] = { SRV_CHK_ERROR, "L6TOUT", "Layer6 timeout" },
65 [HCHK_STATUS_L6RSP] = { SRV_CHK_ERROR, "L6RSP", "Layer6 invalid response" },
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +020066
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +020067 [HCHK_STATUS_L7TOUT] = { SRV_CHK_ERROR, "L7TOUT", "Layer7 timeout" },
68 [HCHK_STATUS_L7RSP] = { SRV_CHK_ERROR, "L7RSP", "Layer7 invalid response" },
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +020069
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +020070 [HCHK_STATUS_L57DATA] = { /* DUMMY STATUS */ },
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +020071
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +020072 [HCHK_STATUS_L7OKD] = { SRV_CHK_RUNNING, "L7OK", "Layer7 check passed" },
73 [HCHK_STATUS_L7OKCD] = { SRV_CHK_RUNNING | SRV_CHK_DISABLE, "L7OKC", "Layer7 check conditionally passed" },
74 [HCHK_STATUS_L7STS] = { SRV_CHK_ERROR, "L7STS", "Layer7 wrong status" },
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +020075};
76
Krzysztof Piotr Oledzki97f07b82009-12-15 22:31:24 +010077const struct analyze_status analyze_statuses[HANA_STATUS_SIZE] = { /* 0: ignore, 1: error, 2: OK */
78 [HANA_STATUS_UNKNOWN] = { "Unknown", { 0, 0 }},
79
80 [HANA_STATUS_L4_OK] = { "L4 successful connection", { 2, 0 }},
81 [HANA_STATUS_L4_ERR] = { "L4 unsuccessful connection", { 1, 1 }},
82
83 [HANA_STATUS_HTTP_OK] = { "Correct http response", { 0, 2 }},
84 [HANA_STATUS_HTTP_STS] = { "Wrong http response", { 0, 1 }},
85 [HANA_STATUS_HTTP_HDRRSP] = { "Invalid http response (headers)", { 0, 1 }},
86 [HANA_STATUS_HTTP_RSP] = { "Invalid http response", { 0, 1 }},
87
88 [HANA_STATUS_HTTP_READ_ERROR] = { "Read error (http)", { 0, 1 }},
89 [HANA_STATUS_HTTP_READ_TIMEOUT] = { "Read timeout (http)", { 0, 1 }},
90 [HANA_STATUS_HTTP_BROKEN_PIPE] = { "Close from server (http)", { 0, 1 }},
91};
92
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +020093/*
94 * Convert check_status code to description
95 */
96const char *get_check_status_description(short check_status) {
97
98 const char *desc;
99
100 if (check_status < HCHK_STATUS_SIZE)
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200101 desc = check_statuses[check_status].desc;
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200102 else
103 desc = NULL;
104
105 if (desc && *desc)
106 return desc;
107 else
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200108 return check_statuses[HCHK_STATUS_UNKNOWN].desc;
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200109}
110
111/*
112 * Convert check_status code to short info
113 */
114const char *get_check_status_info(short check_status) {
115
116 const char *info;
117
118 if (check_status < HCHK_STATUS_SIZE)
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200119 info = check_statuses[check_status].info;
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200120 else
121 info = NULL;
122
123 if (info && *info)
124 return info;
125 else
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200126 return check_statuses[HCHK_STATUS_UNKNOWN].info;
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200127}
128
Krzysztof Piotr Oledzki97f07b82009-12-15 22:31:24 +0100129const char *get_analyze_status(short analyze_status) {
130
131 const char *desc;
132
133 if (analyze_status < HANA_STATUS_SIZE)
134 desc = analyze_statuses[analyze_status].desc;
135 else
136 desc = NULL;
137
138 if (desc && *desc)
139 return desc;
140 else
141 return analyze_statuses[HANA_STATUS_UNKNOWN].desc;
142}
143
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200144#define SSP_O_HCHK 0x0002
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200145
146static void server_status_printf(struct chunk *msg, struct server *s, unsigned options, int xferred) {
147
Krzysztof Piotr Oledzki5f5b7d22010-01-11 11:13:39 +0100148 if (s->tracked)
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200149 chunk_printf(msg, " via %s/%s",
150 s->tracked->proxy->id, s->tracked->id);
151
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200152 if (options & SSP_O_HCHK) {
153 chunk_printf(msg, ", reason: %s", get_check_status_description(s->check_status));
154
155 if (s->check_status >= HCHK_STATUS_L57DATA)
156 chunk_printf(msg, ", code: %d", s->check_code);
157
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200158 if (*s->check_desc) {
159 struct chunk src;
160
161 chunk_printf(msg, ", info: \"");
162
163 chunk_initlen(&src, s->check_desc, 0, strlen(s->check_desc));
164 chunk_asciiencode(msg, &src, '"');
165
166 chunk_printf(msg, "\"");
167 }
168
Krzysztof Piotr Oledzki97f07b82009-12-15 22:31:24 +0100169 if (s->check_duration >= 0)
170 chunk_printf(msg, ", check duration: %ldms", s->check_duration);
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200171 }
172
Krzysztof Piotr Oledzki5f5b7d22010-01-11 11:13:39 +0100173 if (xferred > 0) {
Krzysztof Piotr Oledzkib16a6072010-01-10 21:12:58 +0100174 if (!(s->state & SRV_RUNNING))
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200175 chunk_printf(msg, ". %d active and %d backup servers left.%s"
Krzysztof Piotr Oledzki9f2b9d52010-01-11 13:16:27 +0100176 " %d sessions active, %d requeued, %d remaining in queue",
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200177 s->proxy->srv_act, s->proxy->srv_bck,
178 (s->proxy->srv_bck && !s->proxy->srv_act) ? " Running on backup." : "",
179 s->cur_sess, xferred, s->nbpend);
180 else
181 chunk_printf(msg, ". %d active and %d backup servers online.%s"
Krzysztof Piotr Oledzki9f2b9d52010-01-11 13:16:27 +0100182 " %d sessions requeued, %d total in queue",
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200183 s->proxy->srv_act, s->proxy->srv_bck,
184 (s->proxy->srv_bck && !s->proxy->srv_act) ? " Running on backup." : "",
185 xferred, s->nbpend);
186 }
187}
188
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200189/*
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200190 * Set s->check_status, update s->check_duration and fill s->result with
191 * an adequate SRV_CHK_* value.
192 *
193 * Show information in logs about failed health check if server is UP
194 * or succeeded health checks if server is DOWN.
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200195 */
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200196static void set_server_check_status(struct server *s, short status, char *desc) {
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200197
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200198 struct chunk msg;
199
200 if (status == HCHK_STATUS_START) {
201 s->result = SRV_CHK_UNKNOWN; /* no result yet */
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200202 s->check_desc[0] = '\0';
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200203 s->check_start = now;
204 return;
205 }
206
207 if (!s->check_status)
208 return;
209
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200210 if (desc && *desc) {
211 strncpy(s->check_desc, desc, HCHK_DESC_LEN-1);
212 s->check_desc[HCHK_DESC_LEN-1] = '\0';
213 } else
214 s->check_desc[0] = '\0';
215
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200216 s->check_status = status;
217 if (check_statuses[status].result)
Krzysztof Piotr Oledzki97f07b82009-12-15 22:31:24 +0100218 s->result = check_statuses[status].result;
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200219
Krzysztof Piotr Oledzki97f07b82009-12-15 22:31:24 +0100220 if (status == HCHK_STATUS_HANA)
221 s->check_duration = -1;
222 else if (!tv_iszero(&s->check_start)) {
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200223 /* set_server_check_status() may be called more than once */
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200224 s->check_duration = tv_ms_elapsed(&s->check_start, &now);
225 tv_zero(&s->check_start);
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200226 }
227
228 if (s->proxy->options2 & PR_O2_LOGHCHKS &&
229 (((s->health != 0) && (s->result & SRV_CHK_ERROR)) ||
230 ((s->health != s->rise + s->fall - 1) && (s->result & SRV_CHK_RUNNING)) ||
231 ((s->state & SRV_GOINGDOWN) && !(s->result & SRV_CHK_DISABLE)) ||
232 (!(s->state & SRV_GOINGDOWN) && (s->result & SRV_CHK_DISABLE)))) {
233
234 int health, rise, fall, state;
235
236 chunk_init(&msg, trash, sizeof(trash));
237
238 /* FIXME begin: calculate local version of the health/rise/fall/state */
239 health = s->health;
240 rise = s->rise;
241 fall = s->fall;
242 state = s->state;
243
244 if (s->result & SRV_CHK_ERROR) {
245 if (health > rise) {
246 health--; /* still good */
247 } else {
248 if (health == rise)
249 state &= ~(SRV_RUNNING | SRV_GOINGDOWN);
250
251 health = 0;
252 }
253 }
254
255 if (s->result & SRV_CHK_RUNNING) {
256 if (health < rise + fall - 1) {
257 health++; /* was bad, stays for a while */
258
259 if (health == rise)
260 state |= SRV_RUNNING;
261
262 if (health >= rise)
263 health = rise + fall - 1; /* OK now */
264 }
Krzysztof Piotr Oledzki97f07b82009-12-15 22:31:24 +0100265
266 /* clear consecutive_errors if observing is enabled */
267 if (s->onerror)
268 s->consecutive_errors = 0;
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200269 }
270 /* FIXME end: calculate local version of the health/rise/fall/state */
271
272 chunk_printf(&msg,
273 "Health check for %sserver %s/%s %s%s",
274 s->state & SRV_BACKUP ? "backup " : "",
275 s->proxy->id, s->id,
276 (s->result & SRV_CHK_DISABLE)?"conditionally ":"",
277 (s->result & SRV_CHK_RUNNING)?"succeeded":"failed");
278
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200279 server_status_printf(&msg, s, SSP_O_HCHK, -1);
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200280
Krzysztof Piotr Oledzki9f2b9d52010-01-11 13:16:27 +0100281 chunk_printf(&msg, ", status: %d/%d %s",
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200282 (state & SRV_RUNNING) ? (health - rise + 1) : (health),
283 (state & SRV_RUNNING) ? (fall) : (rise),
284 (state & SRV_RUNNING)?"UP":"DOWN");
285
Krzysztof Piotr Oledzki9f2b9d52010-01-11 13:16:27 +0100286 Warning("%s.\n", trash);
287 send_log(s->proxy, LOG_NOTICE, "%s.\n", trash);
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200288 }
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200289}
290
Willy Tarreau48494c02007-11-30 10:41:39 +0100291/* sends a log message when a backend goes down, and also sets last
292 * change date.
293 */
294static void set_backend_down(struct proxy *be)
295{
296 be->last_change = now.tv_sec;
297 be->down_trans++;
298
299 Alert("%s '%s' has no server available!\n", proxy_type_str(be), be->id);
300 send_log(be, LOG_EMERG, "%s %s has no server available!\n", proxy_type_str(be), be->id);
301}
302
303/* Redistribute pending connections when a server goes down. The number of
304 * connections redistributed is returned.
305 */
306static int redistribute_pending(struct server *s)
307{
308 struct pendconn *pc, *pc_bck, *pc_end;
309 int xferred = 0;
310
311 FOREACH_ITEM_SAFE(pc, pc_bck, &s->pendconns, pc_end, struct pendconn *, list) {
312 struct session *sess = pc->sess;
313 if (sess->be->options & PR_O_REDISP) {
314 /* The REDISP option was specified. We will ignore
315 * cookie and force to balance or use the dispatcher.
316 */
Krzysztof Piotr Oledzki25b501a2008-01-06 16:36:16 +0100317
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100318 /* it's left to the dispatcher to choose a server */
Willy Tarreau48494c02007-11-30 10:41:39 +0100319 sess->flags &= ~(SN_DIRECT | SN_ASSIGNED | SN_ADDR_SET);
Krzysztof Piotr Oledzki25b501a2008-01-06 16:36:16 +0100320
Willy Tarreau48494c02007-11-30 10:41:39 +0100321 pendconn_free(pc);
Willy Tarreaufdccded2008-08-29 18:19:04 +0200322 task_wakeup(sess->task, TASK_WOKEN_RES);
Willy Tarreau48494c02007-11-30 10:41:39 +0100323 xferred++;
324 }
325 }
326 return xferred;
327}
328
329/* Check for pending connections at the backend, and assign some of them to
330 * the server coming up. The server's weight is checked before being assigned
331 * connections it may not be able to handle. The total number of transferred
332 * connections is returned.
333 */
334static int check_for_pending(struct server *s)
335{
336 int xferred;
337
338 if (!s->eweight)
339 return 0;
340
341 for (xferred = 0; !s->maxconn || xferred < srv_dynamic_maxconn(s); xferred++) {
342 struct session *sess;
343 struct pendconn *p;
344
345 p = pendconn_from_px(s->proxy);
346 if (!p)
347 break;
348 p->sess->srv = s;
349 sess = p->sess;
350 pendconn_free(p);
Willy Tarreaufdccded2008-08-29 18:19:04 +0200351 task_wakeup(sess->task, TASK_WOKEN_RES);
Willy Tarreau48494c02007-11-30 10:41:39 +0100352 }
353 return xferred;
354}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200355
356/* Sets server <s> down, notifies by all available means, recounts the
357 * remaining servers on the proxy and transfers queued sessions whenever
Willy Tarreau5af3a692007-07-24 23:32:33 +0200358 * possible to other servers. It automatically recomputes the number of
359 * servers, but not the map.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200360 */
Willy Tarreau83749182007-04-15 20:56:27 +0200361static void set_server_down(struct server *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200362{
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100363 struct server *srv;
364 struct chunk msg;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200365 int xferred;
366
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100367 if (s->health == s->rise || s->tracked) {
Willy Tarreau48494c02007-11-30 10:41:39 +0100368 int srv_was_paused = s->state & SRV_GOINGDOWN;
Krzysztof Oledzki85130942007-10-22 16:21:10 +0200369
370 s->last_change = now.tv_sec;
Willy Tarreau48494c02007-11-30 10:41:39 +0100371 s->state &= ~(SRV_RUNNING | SRV_GOINGDOWN);
Willy Tarreaub625a082007-11-26 01:15:43 +0100372 s->proxy->lbprm.set_server_status_down(s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200373
374 /* we might have sessions queued on this server and waiting for
375 * a connection. Those which are redispatchable will be queued
376 * to another server or to the proxy itself.
377 */
Willy Tarreau48494c02007-11-30 10:41:39 +0100378 xferred = redistribute_pending(s);
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100379
Krzysztof Piotr Oledzki78abe612009-09-27 13:23:20 +0200380 chunk_init(&msg, trash, sizeof(trash));
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100381
Krzysztof Piotr Oledzki78abe612009-09-27 13:23:20 +0200382 chunk_printf(&msg,
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100383 "%sServer %s/%s is DOWN", s->state & SRV_BACKUP ? "Backup " : "",
384 s->proxy->id, s->id);
385
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200386 server_status_printf(&msg, s,
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200387 ((!s->tracked && !(s->proxy->options2 & PR_O2_LOGHCHKS))?SSP_O_HCHK:0),
388 xferred);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200389
Krzysztof Piotr Oledzki9f2b9d52010-01-11 13:16:27 +0100390 Warning("%s.\n", trash);
Krzysztof Oledzki85130942007-10-22 16:21:10 +0200391
Willy Tarreau48494c02007-11-30 10:41:39 +0100392 /* we don't send an alert if the server was previously paused */
393 if (srv_was_paused)
Krzysztof Piotr Oledzki9f2b9d52010-01-11 13:16:27 +0100394 send_log(s->proxy, LOG_NOTICE, "%s.\n", trash);
Willy Tarreau48494c02007-11-30 10:41:39 +0100395 else
Krzysztof Piotr Oledzki9f2b9d52010-01-11 13:16:27 +0100396 send_log(s->proxy, LOG_ALERT, "%s.\n", trash);
Krzysztof Oledzki85130942007-10-22 16:21:10 +0200397
Willy Tarreau48494c02007-11-30 10:41:39 +0100398 if (s->proxy->srv_bck == 0 && s->proxy->srv_act == 0)
399 set_backend_down(s->proxy);
400
Krzysztof Piotr Oledzki052d4fd2009-10-04 14:52:57 +0200401 s->counters.down_trans++;
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100402
Krzysztof Piotr Oledzkif39c71c2009-01-30 00:52:49 +0100403 if (s->state & SRV_CHECKED)
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100404 for(srv = s->tracknext; srv; srv = srv->tracknext)
405 set_server_down(srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200406 }
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100407
Willy Tarreaubaaee002006-06-26 02:48:02 +0200408 s->health = 0; /* failure */
409}
410
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100411static void set_server_up(struct server *s) {
412
413 struct server *srv;
414 struct chunk msg;
415 int xferred;
416
417 if (s->health == s->rise || s->tracked) {
418 if (s->proxy->srv_bck == 0 && s->proxy->srv_act == 0) {
419 if (s->proxy->last_change < now.tv_sec) // ignore negative times
420 s->proxy->down_time += now.tv_sec - s->proxy->last_change;
421 s->proxy->last_change = now.tv_sec;
422 }
423
424 if (s->last_change < now.tv_sec) // ignore negative times
425 s->down_time += now.tv_sec - s->last_change;
426
427 s->last_change = now.tv_sec;
428 s->state |= SRV_RUNNING;
429
430 if (s->slowstart > 0) {
431 s->state |= SRV_WARMINGUP;
432 if (s->proxy->lbprm.algo & BE_LB_PROP_DYN) {
433 /* For dynamic algorithms, start at the first step of the weight,
434 * without multiplying by BE_WEIGHT_SCALE.
435 */
436 s->eweight = s->uweight;
437 if (s->proxy->lbprm.update_server_eweight)
438 s->proxy->lbprm.update_server_eweight(s);
439 }
440 }
441 s->proxy->lbprm.set_server_status_up(s);
442
443 /* check if we can handle some connections queued at the proxy. We
444 * will take as many as we can handle.
445 */
446 xferred = check_for_pending(s);
447
Krzysztof Piotr Oledzki78abe612009-09-27 13:23:20 +0200448 chunk_init(&msg, trash, sizeof(trash));
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100449
Krzysztof Piotr Oledzki78abe612009-09-27 13:23:20 +0200450 chunk_printf(&msg,
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100451 "%sServer %s/%s is UP", s->state & SRV_BACKUP ? "Backup " : "",
452 s->proxy->id, s->id);
453
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200454 server_status_printf(&msg, s,
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200455 ((!s->tracked && !(s->proxy->options2 & PR_O2_LOGHCHKS))?SSP_O_HCHK:0),
Krzysztof Piotr Oledzkib16a6072010-01-10 21:12:58 +0100456 xferred);
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100457
Krzysztof Piotr Oledzki9f2b9d52010-01-11 13:16:27 +0100458 Warning("%s.\n", trash);
459 send_log(s->proxy, LOG_NOTICE, "%s.\n", trash);
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100460
Krzysztof Piotr Oledzkif39c71c2009-01-30 00:52:49 +0100461 if (s->state & SRV_CHECKED)
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100462 for(srv = s->tracknext; srv; srv = srv->tracknext)
463 set_server_up(srv);
464 }
465
466 if (s->health >= s->rise)
467 s->health = s->rise + s->fall - 1; /* OK now */
468
469}
470
471static void set_server_disabled(struct server *s) {
472
473 struct server *srv;
474 struct chunk msg;
475 int xferred;
476
477 s->state |= SRV_GOINGDOWN;
478 s->proxy->lbprm.set_server_status_down(s);
479
480 /* we might have sessions queued on this server and waiting for
481 * a connection. Those which are redispatchable will be queued
482 * to another server or to the proxy itself.
483 */
484 xferred = redistribute_pending(s);
485
Krzysztof Piotr Oledzki78abe612009-09-27 13:23:20 +0200486 chunk_init(&msg, trash, sizeof(trash));
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100487
Krzysztof Piotr Oledzki78abe612009-09-27 13:23:20 +0200488 chunk_printf(&msg,
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100489 "Load-balancing on %sServer %s/%s is disabled",
490 s->state & SRV_BACKUP ? "Backup " : "",
491 s->proxy->id, s->id);
492
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200493 server_status_printf(&msg, s,
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200494 ((!s->tracked && !(s->proxy->options2 & PR_O2_LOGHCHKS))?SSP_O_HCHK:0),
Krzysztof Piotr Oledzkib16a6072010-01-10 21:12:58 +0100495 xferred);
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100496
Krzysztof Piotr Oledzki9f2b9d52010-01-11 13:16:27 +0100497 Warning("%s.\n", trash);
498 send_log(s->proxy, LOG_NOTICE, "%s.\n", trash);
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100499
500 if (!s->proxy->srv_bck && !s->proxy->srv_act)
501 set_backend_down(s->proxy);
502
Krzysztof Piotr Oledzkif39c71c2009-01-30 00:52:49 +0100503 if (s->state & SRV_CHECKED)
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100504 for(srv = s->tracknext; srv; srv = srv->tracknext)
505 set_server_disabled(srv);
506}
507
508static void set_server_enabled(struct server *s) {
509
510 struct server *srv;
511 struct chunk msg;
512 int xferred;
513
514 s->state &= ~SRV_GOINGDOWN;
515 s->proxy->lbprm.set_server_status_up(s);
516
517 /* check if we can handle some connections queued at the proxy. We
518 * will take as many as we can handle.
519 */
520 xferred = check_for_pending(s);
521
Krzysztof Piotr Oledzki78abe612009-09-27 13:23:20 +0200522 chunk_init(&msg, trash, sizeof(trash));
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100523
Krzysztof Piotr Oledzki78abe612009-09-27 13:23:20 +0200524 chunk_printf(&msg,
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100525 "Load-balancing on %sServer %s/%s is enabled again",
526 s->state & SRV_BACKUP ? "Backup " : "",
527 s->proxy->id, s->id);
528
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200529 server_status_printf(&msg, s,
Krzysztof Piotr Oledzki99ab5f82009-09-27 17:28:21 +0200530 ((!s->tracked && !(s->proxy->options2 & PR_O2_LOGHCHKS))?SSP_O_HCHK:0),
Krzysztof Piotr Oledzkib16a6072010-01-10 21:12:58 +0100531 xferred);
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100532
Krzysztof Piotr Oledzki9f2b9d52010-01-11 13:16:27 +0100533 Warning("%s.\n", trash);
534 send_log(s->proxy, LOG_NOTICE, "%s.\n", trash);
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100535
Krzysztof Piotr Oledzkif39c71c2009-01-30 00:52:49 +0100536 if (s->state & SRV_CHECKED)
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +0100537 for(srv = s->tracknext; srv; srv = srv->tracknext)
538 set_server_enabled(srv);
539}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200540
Krzysztof Piotr Oledzki97f07b82009-12-15 22:31:24 +0100541void health_adjust(struct server *s, short status) {
542
543 int failed;
544 int expire;
545
546 /* return now if observing nor health check is not enabled */
547 if (!s->observe || !s->check)
548 return;
549
550 if (s->observe >= HANA_OBS_SIZE)
551 return;
552
553 if (status >= HCHK_STATUS_SIZE || !analyze_statuses[status].desc)
554 return;
555
556 switch (analyze_statuses[status].lr[s->observe - 1]) {
557 case 1:
558 failed = 1;
559 break;
560
561 case 2:
562 failed = 0;
563 break;
564
565 default:
566 return;
567 }
568
569 if (!failed) {
570 /* good: clear consecutive_errors */
571 s->consecutive_errors = 0;
572 return;
573 }
574
575 s->consecutive_errors++;
576
577 if (s->consecutive_errors < s->consecutive_errors_limit)
578 return;
579
580 sprintf(trash, "Detected %d consecutive errors, last one was: %s",
581 s->consecutive_errors, get_analyze_status(status));
582
583 switch (s->onerror) {
584 case HANA_ONERR_FASTINTER:
585 /* force fastinter - nothing to do here as all modes force it */
586 break;
587
588 case HANA_ONERR_SUDDTH:
589 /* simulate a pre-fatal failed health check */
590 if (s->health > s->rise)
591 s->health = s->rise + 1;
592
593 /* no break - fall through */
594
595 case HANA_ONERR_FAILCHK:
596 /* simulate a failed health check */
597 set_server_check_status(s, HCHK_STATUS_HANA, trash);
598
599 if (s->health > s->rise) {
600 s->health--; /* still good */
601 s->counters.failed_checks++;
602 }
603 else
604 set_server_down(s);
605
606 break;
607
608 case HANA_ONERR_MARKDWN:
609 /* mark server down */
610 s->health = s->rise;
611 set_server_check_status(s, HCHK_STATUS_HANA, trash);
612 set_server_down(s);
613
614 break;
615
616 default:
617 /* write a warning? */
618 break;
619 }
620
621 s->consecutive_errors = 0;
622 s->counters.failed_hana++;
623
624 if (s->fastinter) {
625 expire = tick_add(now_ms, MS_TO_TICKS(s->fastinter));
626 if (s->check->expire > expire)
627 s->check->expire = expire;
628 }
629}
630
Willy Tarreaubaaee002006-06-26 02:48:02 +0200631/*
632 * This function is used only for server health-checks. It handles
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200633 * the connection acknowledgement. If the proxy requires L7 health-checks,
634 * it sends the request. In other cases, it calls set_server_check_status()
635 * to set s->check_status, s->check_duration and s->result.
Willy Tarreau83749182007-04-15 20:56:27 +0200636 * The function itself returns 0 if it needs some polling before being called
637 * again, otherwise 1.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200638 */
Willy Tarreau83749182007-04-15 20:56:27 +0200639static int event_srv_chk_w(int fd)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200640{
Willy Tarreau6996e152007-04-30 14:37:43 +0200641 __label__ out_wakeup, out_nowake, out_poll, out_error;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200642 struct task *t = fdtab[fd].owner;
643 struct server *s = t->context;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200644
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +0100645 //fprintf(stderr, "event_srv_chk_w, state=%ld\n", unlikely(fdtab[fd].state));
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200646 if (unlikely(fdtab[fd].state == FD_STERROR || (fdtab[fd].ev & FD_POLL_ERR))) {
Krzysztof Piotr Oledzki6492db52010-01-02 22:03:01 +0100647 int skerr, err = errno;
648 socklen_t lskerr = sizeof(skerr);
649
650 if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr) && skerr)
651 err = skerr;
652
653 set_server_check_status(s, HCHK_STATUS_L4CON, strerror(err));
Willy Tarreau6996e152007-04-30 14:37:43 +0200654 goto out_error;
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200655 }
Willy Tarreau6996e152007-04-30 14:37:43 +0200656
657 /* here, we know that the connection is established */
Willy Tarreau83749182007-04-15 20:56:27 +0200658
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100659 if (!(s->result & SRV_CHK_ERROR)) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200660 /* we don't want to mark 'UP' a server on which we detected an error earlier */
Willy Tarreauf3c69202006-07-09 16:42:34 +0200661 if ((s->proxy->options & PR_O_HTTP_CHK) ||
Willy Tarreau23677902007-05-08 23:50:35 +0200662 (s->proxy->options & PR_O_SSL3_CHK) ||
Hervé COMMOWICK698ae002010-01-12 09:25:13 +0100663 (s->proxy->options & PR_O_SMTP_CHK) ||
664 (s->proxy->options2 & PR_O2_MYSQL_CHK)) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200665 int ret;
Willy Tarreauf3c69202006-07-09 16:42:34 +0200666 /* we want to check if this host replies to HTTP or SSLv3 requests
Willy Tarreaubaaee002006-06-26 02:48:02 +0200667 * so we'll send the request, and won't wake the checker up now.
668 */
Willy Tarreauf3c69202006-07-09 16:42:34 +0200669
670 if (s->proxy->options & PR_O_SSL3_CHK) {
671 /* SSL requires that we put Unix time in the request */
Willy Tarreaub7f694f2008-06-22 17:18:02 +0200672 int gmt_time = htonl(date.tv_sec);
Willy Tarreauf3c69202006-07-09 16:42:34 +0200673 memcpy(s->proxy->check_req + 11, &gmt_time, 4);
674 }
675
Willy Tarreaubaaee002006-06-26 02:48:02 +0200676 ret = send(fd, s->proxy->check_req, s->proxy->check_len, MSG_DONTWAIT | MSG_NOSIGNAL);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200677 if (ret == s->proxy->check_len) {
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +0100678 /* we allow up to <timeout.check> if nonzero for a responce */
Willy Tarreau7cd9d942008-12-21 13:00:41 +0100679 if (s->proxy->timeout.check)
680 t->expire = tick_add_ifset(now_ms, s->proxy->timeout.check);
Willy Tarreauf161a342007-04-08 16:59:42 +0200681 EV_FD_SET(fd, DIR_RD); /* prepare for reading reply */
Willy Tarreau83749182007-04-15 20:56:27 +0200682 goto out_nowake;
683 }
Willy Tarreau6996e152007-04-30 14:37:43 +0200684 else if (ret == 0 || errno == EAGAIN)
685 goto out_poll;
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200686 else {
687 switch (errno) {
688 case ECONNREFUSED:
689 case ENETUNREACH:
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200690 set_server_check_status(s, HCHK_STATUS_L4CON, strerror(errno));
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200691 break;
692
693 default:
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200694 set_server_check_status(s, HCHK_STATUS_SOCKERR, strerror(errno));
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200695 }
696
Willy Tarreau6996e152007-04-30 14:37:43 +0200697 goto out_error;
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200698 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200699 }
700 else {
Willy Tarreau6996e152007-04-30 14:37:43 +0200701 /* We have no data to send to check the connection, and
702 * getsockopt() will not inform us whether the connection
703 * is still pending. So we'll reuse connect() to check the
704 * state of the socket. This has the advantage of givig us
705 * the following info :
706 * - error
707 * - connecting (EALREADY, EINPROGRESS)
708 * - connected (EISCONN, 0)
709 */
710
711 struct sockaddr_in sa;
712
713 sa = (s->check_addr.sin_addr.s_addr) ? s->check_addr : s->addr;
714 sa.sin_port = htons(s->check_port);
715
716 if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) == 0)
717 errno = 0;
718
719 if (errno == EALREADY || errno == EINPROGRESS)
720 goto out_poll;
721
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200722 if (errno && errno != EISCONN) {
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200723 set_server_check_status(s, HCHK_STATUS_L4CON, strerror(errno));
Willy Tarreau6996e152007-04-30 14:37:43 +0200724 goto out_error;
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200725 }
Willy Tarreau6996e152007-04-30 14:37:43 +0200726
Willy Tarreaubaaee002006-06-26 02:48:02 +0200727 /* good TCP connection is enough */
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200728 set_server_check_status(s, HCHK_STATUS_L4OK, NULL);
Willy Tarreau6996e152007-04-30 14:37:43 +0200729 goto out_wakeup;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200730 }
731 }
Willy Tarreau83749182007-04-15 20:56:27 +0200732 out_wakeup:
Willy Tarreaufdccded2008-08-29 18:19:04 +0200733 task_wakeup(t, TASK_WOKEN_IO);
Willy Tarreau83749182007-04-15 20:56:27 +0200734 out_nowake:
735 EV_FD_CLR(fd, DIR_WR); /* nothing more to write */
Willy Tarreaud6f087e2008-01-18 17:20:13 +0100736 fdtab[fd].ev &= ~FD_POLL_OUT;
Willy Tarreau83749182007-04-15 20:56:27 +0200737 return 1;
Willy Tarreau6996e152007-04-30 14:37:43 +0200738 out_poll:
739 /* The connection is still pending. We'll have to poll it
740 * before attempting to go further. */
Willy Tarreaud6f087e2008-01-18 17:20:13 +0100741 fdtab[fd].ev &= ~FD_POLL_OUT;
Willy Tarreau6996e152007-04-30 14:37:43 +0200742 return 0;
743 out_error:
Willy Tarreau6996e152007-04-30 14:37:43 +0200744 fdtab[fd].state = FD_STERROR;
745 goto out_wakeup;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200746}
747
748
749/*
Willy Tarreauf3c69202006-07-09 16:42:34 +0200750 * This function is used only for server health-checks. It handles the server's
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200751 * reply to an HTTP request or SSL HELLO. It calls set_server_check_status() to
752 * update s->check_status, s->check_duration and s->result.
753
754 * The set_server_check_status function is called with HCHK_STATUS_L7OKD if
755 * an HTTP server replies HTTP 2xx or 3xx (valid responses), if an SMTP server
756 * returns 2xx, HCHK_STATUS_L6OK if an SSL server returns at least 5 bytes in
757 * response to an SSL HELLO (the principle is that this is enough to
758 * distinguish between an SSL server and a pure TCP relay). All other cases will
759 * call it with a proper error status like HCHK_STATUS_L7STS, HCHK_STATUS_L6RSP,
760 * etc.
761 *
762 * The function returns 0 if it needs to be called again after some polling,
763 * otherwise non-zero..
Willy Tarreaubaaee002006-06-26 02:48:02 +0200764 */
Willy Tarreau83749182007-04-15 20:56:27 +0200765static int event_srv_chk_r(int fd)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200766{
Willy Tarreau83749182007-04-15 20:56:27 +0200767 __label__ out_wakeup;
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100768 int len;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200769 struct task *t = fdtab[fd].owner;
770 struct server *s = t->context;
771 int skerr;
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200772 char *desc;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200773 socklen_t lskerr = sizeof(skerr);
774
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100775 len = -1;
Willy Tarreau83749182007-04-15 20:56:27 +0200776
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100777 if (unlikely((s->result & SRV_CHK_ERROR) ||
778 (fdtab[fd].state == FD_STERROR) ||
Willy Tarreau83749182007-04-15 20:56:27 +0200779 (fdtab[fd].ev & FD_POLL_ERR) ||
780 (getsockopt(fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr) == -1) ||
781 (skerr != 0))) {
782 /* in case of TCP only, this tells us if the connection failed */
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200783
784 if (!(s->result & SRV_CHK_ERROR))
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200785 set_server_check_status(s, HCHK_STATUS_SOCKERR, NULL);
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200786
Willy Tarreau83749182007-04-15 20:56:27 +0200787 goto out_wakeup;
788 }
789
Willy Tarreau83749182007-04-15 20:56:27 +0200790 /* Warning! Linux returns EAGAIN on SO_ERROR if data are still available
791 * but the connection was closed on the remote end. Fortunately, recv still
792 * works correctly and we don't need to do the getsockopt() on linux.
793 */
Krzysztof Oledzki6b3f8b42007-10-11 18:41:08 +0200794 len = recv(fd, trash, sizeof(trash), MSG_NOSIGNAL);
Willy Tarreau83749182007-04-15 20:56:27 +0200795 if (unlikely(len < 0 && errno == EAGAIN)) {
796 /* we want some polling to happen first */
Willy Tarreaud6f087e2008-01-18 17:20:13 +0100797 fdtab[fd].ev &= ~FD_POLL_IN;
Willy Tarreau83749182007-04-15 20:56:27 +0200798 return 0;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200799 }
800
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200801 if (len < sizeof(trash))
802 trash[len] = '\0';
803 else
804 trash[len-1] = '\0';
805
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100806 /* Note: the response will only be accepted if read at once */
807 if (s->proxy->options & PR_O_HTTP_CHK) {
808 /* Check if the server speaks HTTP 1.X */
809 if ((len < strlen("HTTP/1.0 000\r")) ||
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200810 (memcmp(trash, "HTTP/1.", 7) != 0 ||
811 (trash[12] != ' ' && trash[12] != '\r')) ||
812 !isdigit(trash[9]) || !isdigit(trash[10]) || !isdigit(trash[11])) {
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200813
814 cut_crlf(trash);
815 set_server_check_status(s, HCHK_STATUS_L7RSP, trash);
816
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100817 goto out_wakeup;
818 }
819
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200820 s->check_code = str2uic(&trash[9]);
821
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200822 desc = ltrim(&trash[12], ' ');
823 cut_crlf(desc);
824
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100825 /* check the reply : HTTP/1.X 2xx and 3xx are OK */
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200826 if (trash[9] == '2' || trash[9] == '3')
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200827 set_server_check_status(s, HCHK_STATUS_L7OKD, desc);
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200828 else if ((s->proxy->options & PR_O_DISABLE404) &&
Willy Tarreau48494c02007-11-30 10:41:39 +0100829 (s->state & SRV_RUNNING) &&
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200830 (s->check_code == 404))
831 /* 404 may be accepted as "stopping" only if the server was up */
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200832 set_server_check_status(s, HCHK_STATUS_L7OKCD, desc);
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200833 else
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200834 set_server_check_status(s, HCHK_STATUS_L7STS, desc);
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100835 }
836 else if (s->proxy->options & PR_O_SSL3_CHK) {
837 /* Check for SSLv3 alert or handshake */
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200838 if ((len >= 5) && (trash[0] == 0x15 || trash[0] == 0x16))
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200839 set_server_check_status(s, HCHK_STATUS_L6OK, NULL);
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200840 else
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200841 set_server_check_status(s, HCHK_STATUS_L6RSP, NULL);
Willy Tarreau6996e152007-04-30 14:37:43 +0200842 }
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100843 else if (s->proxy->options & PR_O_SMTP_CHK) {
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200844 /* Check if the server speaks SMTP */
845 if ((len < strlen("000\r")) ||
846 (trash[3] != ' ' && trash[3] != '\r') ||
847 !isdigit(trash[0]) || !isdigit(trash[1]) || !isdigit(trash[2])) {
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200848
849 cut_crlf(trash);
850 set_server_check_status(s, HCHK_STATUS_L7RSP, trash);
851
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +0200852 goto out_wakeup;
853 }
854
855 s->check_code = str2uic(&trash[0]);
856
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200857 desc = ltrim(&trash[3], ' ');
858 cut_crlf(desc);
859
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100860 /* Check for SMTP code 2xx (should be 250) */
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200861 if (trash[0] == '2')
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200862 set_server_check_status(s, HCHK_STATUS_L7OKD, desc);
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +0200863 else
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200864 set_server_check_status(s, HCHK_STATUS_L7STS, desc);
Willy Tarreau6996e152007-04-30 14:37:43 +0200865 }
Hervé COMMOWICK698ae002010-01-12 09:25:13 +0100866 else if (s->proxy->options2 & PR_O2_MYSQL_CHK) {
867 /* MySQL Error packet always begin with field_count = 0xff
868 * contrary to OK Packet who always begin whith 0x00 */
869 if (trash[4] != -1) {
870 /* We set the MySQL Version in description for information purpose
871 * FIXME : it can be cool to use MySQL Version for other purpose,
872 * like mark as down old MySQL server.
873 */
874 if (len > 51) {
875 desc = ltrim(&trash[5], ' ');
876 set_server_check_status(s, HCHK_STATUS_L7OKD, desc);
877 }
878 else {
879 /* it seems we have a OK packet but without a valid length,
880 * it must be a protocol error
881 */
882 set_server_check_status(s, HCHK_STATUS_L7RSP, trash);
883 }
884 }
885 else {
886 /* An error message is attached in the Error packet,
887 * so we can display it ! :)
888 */
889 desc = ltrim(&trash[7], ' ');
890 set_server_check_status(s, HCHK_STATUS_L7STS, desc);
891 }
892 }
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100893 else {
894 /* other checks are valid if the connection succeeded anyway */
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200895 set_server_check_status(s, HCHK_STATUS_L4OK, NULL);
Willy Tarreau23677902007-05-08 23:50:35 +0200896 }
Willy Tarreau83749182007-04-15 20:56:27 +0200897
Willy Tarreauc7dd71a2007-11-30 08:33:21 +0100898 out_wakeup:
899 if (s->result & SRV_CHK_ERROR)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200900 fdtab[fd].state = FD_STERROR;
901
Willy Tarreauf161a342007-04-08 16:59:42 +0200902 EV_FD_CLR(fd, DIR_RD);
Willy Tarreaufdccded2008-08-29 18:19:04 +0200903 task_wakeup(t, TASK_WOKEN_IO);
Willy Tarreaud6f087e2008-01-18 17:20:13 +0100904 fdtab[fd].ev &= ~FD_POLL_IN;
Willy Tarreau83749182007-04-15 20:56:27 +0200905 return 1;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200906}
907
908/*
909 * manages a server health-check. Returns
910 * the time the task accepts to wait, or TIME_ETERNITY for infinity.
911 */
Willy Tarreau26c25062009-03-08 09:38:41 +0100912struct task *process_chk(struct task *t)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200913{
Willy Tarreaue3838802009-03-21 18:58:32 +0100914 int attempts = 0;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200915 struct server *s = t->context;
916 struct sockaddr_in sa;
917 int fd;
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +0200918 int rv;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200919
920 //fprintf(stderr, "process_chk: task=%p\n", t);
921
922 new_chk:
Willy Tarreaue3838802009-03-21 18:58:32 +0100923 if (attempts++ > 0) {
924 /* we always fail to create a server, let's stop insisting... */
925 while (tick_is_expired(t->expire, now_ms))
926 t->expire = tick_add(t->expire, MS_TO_TICKS(s->inter));
927 return t;
928 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200929 fd = s->curfd;
930 if (fd < 0) { /* no check currently running */
931 //fprintf(stderr, "process_chk: 2\n");
Willy Tarreau26c25062009-03-08 09:38:41 +0100932 if (!tick_is_expired(t->expire, now_ms)) /* woke up too early */
933 return t;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200934
935 /* we don't send any health-checks when the proxy is stopped or when
936 * the server should not be checked.
937 */
938 if (!(s->state & SRV_CHECKED) || s->proxy->state == PR_STSTOPPED) {
Willy Tarreau0c303ee2008-07-07 00:09:58 +0200939 while (tick_is_expired(t->expire, now_ms))
940 t->expire = tick_add(t->expire, MS_TO_TICKS(s->inter));
Willy Tarreau26c25062009-03-08 09:38:41 +0100941 return t;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200942 }
943
944 /* we'll initiate a new check */
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +0200945 set_server_check_status(s, HCHK_STATUS_START, NULL);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200946 if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) != -1) {
947 if ((fd < global.maxsock) &&
948 (fcntl(fd, F_SETFL, O_NONBLOCK) != -1) &&
949 (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &one, sizeof(one)) != -1)) {
950 //fprintf(stderr, "process_chk: 3\n");
951
Willy Tarreau9edd1612007-10-18 18:07:48 +0200952 if (s->proxy->options & PR_O_TCP_NOLING) {
953 /* We don't want to useless data */
954 setsockopt(fd, SOL_SOCKET, SO_LINGER, (struct linger *) &nolinger, sizeof(struct linger));
955 }
Willy Tarreau2ea3abb2007-03-25 16:45:16 +0200956
Willy Tarreau0f03c6f2007-03-25 20:46:19 +0200957 if (s->check_addr.sin_addr.s_addr)
958 /* we'll connect to the check addr specified on the server */
Willy Tarreau2ea3abb2007-03-25 16:45:16 +0200959 sa = s->check_addr;
Willy Tarreau2ea3abb2007-03-25 16:45:16 +0200960 else
Willy Tarreau0f03c6f2007-03-25 20:46:19 +0200961 /* we'll connect to the addr on the server */
Willy Tarreau2ea3abb2007-03-25 16:45:16 +0200962 sa = s->addr;
Willy Tarreau0f03c6f2007-03-25 20:46:19 +0200963
Willy Tarreaubaaee002006-06-26 02:48:02 +0200964 /* we'll connect to the check port on the server */
Willy Tarreaubaaee002006-06-26 02:48:02 +0200965 sa.sin_port = htons(s->check_port);
966
967 /* allow specific binding :
968 * - server-specific at first
969 * - proxy-specific next
970 */
971 if (s->state & SRV_BIND_SRC) {
Willy Tarreaue8c66af2008-01-13 18:40:14 +0100972 struct sockaddr_in *remote = NULL;
973 int ret, flags = 0;
Willy Tarreau163c5322006-11-14 16:18:41 +0100974
Willy Tarreaucf1d5722008-02-14 20:28:18 +0100975#if defined(CONFIG_HAP_CTTPROXY) || defined(CONFIG_HAP_LINUX_TPROXY)
Willy Tarreaue8c66af2008-01-13 18:40:14 +0100976 if ((s->state & SRV_TPROXY_MASK) == SRV_TPROXY_ADDR) {
977 remote = (struct sockaddr_in *)&s->tproxy_addr;
978 flags = 3;
979 }
Willy Tarreaucf1d5722008-02-14 20:28:18 +0100980#endif
Willy Tarreauc76721d2009-02-04 20:20:58 +0100981#ifdef SO_BINDTODEVICE
982 /* Note: this might fail if not CAP_NET_RAW */
983 if (s->iface_name)
984 setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
Willy Tarreau604e8302009-03-06 00:48:23 +0100985 s->iface_name, s->iface_len + 1);
Willy Tarreauc76721d2009-02-04 20:20:58 +0100986#endif
Willy Tarreauc6f4ce82009-06-10 11:09:37 +0200987 if (s->sport_range) {
988 int bind_attempts = 10; /* should be more than enough to find a spare port */
989 struct sockaddr_in src;
990
991 ret = 1;
992 src = s->source_addr;
993
994 do {
995 /* note: in case of retry, we may have to release a previously
996 * allocated port, hence this loop's construct.
997 */
Willy Tarreau8d5d77e2009-10-18 07:25:52 +0200998 port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port);
999 fdinfo[fd].port_range = NULL;
Willy Tarreauc6f4ce82009-06-10 11:09:37 +02001000
1001 if (!bind_attempts)
1002 break;
1003 bind_attempts--;
1004
Willy Tarreau8d5d77e2009-10-18 07:25:52 +02001005 fdinfo[fd].local_port = port_range_alloc_port(s->sport_range);
1006 if (!fdinfo[fd].local_port)
Willy Tarreauc6f4ce82009-06-10 11:09:37 +02001007 break;
1008
Willy Tarreau8d5d77e2009-10-18 07:25:52 +02001009 fdinfo[fd].port_range = s->sport_range;
1010 src.sin_port = htons(fdinfo[fd].local_port);
Willy Tarreauc6f4ce82009-06-10 11:09:37 +02001011
1012 ret = tcpv4_bind_socket(fd, flags, &src, remote);
1013 } while (ret != 0); /* binding NOK */
1014 }
1015 else {
1016 ret = tcpv4_bind_socket(fd, flags, &s->source_addr, remote);
1017 }
1018
Willy Tarreaue8c66af2008-01-13 18:40:14 +01001019 if (ret) {
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +02001020 set_server_check_status(s, HCHK_STATUS_SOCKERR, NULL);
Willy Tarreaue8c66af2008-01-13 18:40:14 +01001021 switch (ret) {
1022 case 1:
1023 Alert("Cannot bind to source address before connect() for server %s/%s. Aborting.\n",
1024 s->proxy->id, s->id);
1025 break;
1026 case 2:
Willy Tarreau163c5322006-11-14 16:18:41 +01001027 Alert("Cannot bind to tproxy source address before connect() for server %s/%s. Aborting.\n",
1028 s->proxy->id, s->id);
Willy Tarreaue8c66af2008-01-13 18:40:14 +01001029 break;
Willy Tarreau163c5322006-11-14 16:18:41 +01001030 }
1031 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001032 }
1033 else if (s->proxy->options & PR_O_BIND_SRC) {
Willy Tarreaue8c66af2008-01-13 18:40:14 +01001034 struct sockaddr_in *remote = NULL;
1035 int ret, flags = 0;
1036
Willy Tarreaucf1d5722008-02-14 20:28:18 +01001037#if defined(CONFIG_HAP_CTTPROXY) || defined(CONFIG_HAP_LINUX_TPROXY)
Willy Tarreau163c5322006-11-14 16:18:41 +01001038 if ((s->proxy->options & PR_O_TPXY_MASK) == PR_O_TPXY_ADDR) {
Willy Tarreaue8c66af2008-01-13 18:40:14 +01001039 remote = (struct sockaddr_in *)&s->proxy->tproxy_addr;
1040 flags = 3;
1041 }
Willy Tarreaucf1d5722008-02-14 20:28:18 +01001042#endif
Willy Tarreaud53f96b2009-02-04 18:46:54 +01001043#ifdef SO_BINDTODEVICE
1044 /* Note: this might fail if not CAP_NET_RAW */
1045 if (s->proxy->iface_name)
1046 setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
Willy Tarreau604e8302009-03-06 00:48:23 +01001047 s->proxy->iface_name, s->proxy->iface_len + 1);
Willy Tarreaud53f96b2009-02-04 18:46:54 +01001048#endif
Willy Tarreaue8c66af2008-01-13 18:40:14 +01001049 ret = tcpv4_bind_socket(fd, flags, &s->proxy->source_addr, remote);
1050 if (ret) {
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +02001051 set_server_check_status(s, HCHK_STATUS_SOCKERR, NULL);
Willy Tarreaue8c66af2008-01-13 18:40:14 +01001052 switch (ret) {
1053 case 1:
1054 Alert("Cannot bind to source address before connect() for %s '%s'. Aborting.\n",
1055 proxy_type_str(s->proxy), s->proxy->id);
1056 break;
1057 case 2:
Willy Tarreau2b5652f2006-12-31 17:46:05 +01001058 Alert("Cannot bind to tproxy source address before connect() for %s '%s'. Aborting.\n",
1059 proxy_type_str(s->proxy), s->proxy->id);
Willy Tarreaue8c66af2008-01-13 18:40:14 +01001060 break;
Willy Tarreau163c5322006-11-14 16:18:41 +01001061 }
1062 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001063 }
1064
Willy Tarreauc7dd71a2007-11-30 08:33:21 +01001065 if (s->result == SRV_CHK_UNKNOWN) {
Dmitry Sivachenkocaf58982009-08-24 15:11:06 +04001066#if defined(TCP_QUICKACK)
Willy Tarreau1274bc42009-07-15 07:16:31 +02001067 /* disabling tcp quick ack now allows
1068 * the request to leave the machine with
1069 * the first ACK.
1070 */
1071 if (s->proxy->options2 & PR_O2_SMARTCON)
Dmitry Sivachenkocaf58982009-08-24 15:11:06 +04001072 setsockopt(fd, IPPROTO_TCP, TCP_QUICKACK, (char *) &zero, sizeof(zero));
Willy Tarreau1274bc42009-07-15 07:16:31 +02001073#endif
Willy Tarreaubaaee002006-06-26 02:48:02 +02001074 if ((connect(fd, (struct sockaddr *)&sa, sizeof(sa)) != -1) || (errno == EINPROGRESS)) {
1075 /* OK, connection in progress or established */
1076
1077 //fprintf(stderr, "process_chk: 4\n");
1078
1079 s->curfd = fd; /* that's how we know a test is in progress ;-) */
Willy Tarreau7a966482007-04-15 10:58:02 +02001080 fd_insert(fd);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001081 fdtab[fd].owner = t;
Willy Tarreau54469402006-07-29 16:59:06 +02001082 fdtab[fd].cb[DIR_RD].f = &event_srv_chk_r;
1083 fdtab[fd].cb[DIR_RD].b = NULL;
1084 fdtab[fd].cb[DIR_WR].f = &event_srv_chk_w;
1085 fdtab[fd].cb[DIR_WR].b = NULL;
Willy Tarreau8d5d77e2009-10-18 07:25:52 +02001086 fdinfo[fd].peeraddr = (struct sockaddr *)&sa;
1087 fdinfo[fd].peerlen = sizeof(sa);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001088 fdtab[fd].state = FD_STCONN; /* connection in progress */
Willy Tarreaufb14edc2009-06-14 15:24:37 +02001089 fdtab[fd].flags = FD_FL_TCP | FD_FL_TCP_NODELAY;
Willy Tarreauf161a342007-04-08 16:59:42 +02001090 EV_FD_SET(fd, DIR_WR); /* for connect status */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001091#ifdef DEBUG_FULL
Willy Tarreauf161a342007-04-08 16:59:42 +02001092 assert (!EV_FD_ISSET(fd, DIR_RD));
Willy Tarreaubaaee002006-06-26 02:48:02 +02001093#endif
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001094 //fprintf(stderr, "process_chk: 4+, %lu\n", __tv_to_ms(&s->proxy->timeout.connect));
1095 /* we allow up to min(inter, timeout.connect) for a connection
1096 * to establish but only when timeout.check is set
1097 * as it may be to short for a full check otherwise
1098 */
Willy Tarreau0c303ee2008-07-07 00:09:58 +02001099 t->expire = tick_add(now_ms, MS_TO_TICKS(s->inter));
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001100
Willy Tarreau0c303ee2008-07-07 00:09:58 +02001101 if (s->proxy->timeout.check && s->proxy->timeout.connect) {
1102 int t_con = tick_add(now_ms, s->proxy->timeout.connect);
1103 t->expire = tick_first(t->expire, t_con);
Willy Tarreau60548192008-02-17 11:34:10 +01001104 }
Willy Tarreau26c25062009-03-08 09:38:41 +01001105 return t;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001106 }
1107 else if (errno != EALREADY && errno != EISCONN && errno != EAGAIN) {
Krzysztof Piotr Oledzki213014e2009-09-27 15:50:02 +02001108 /* a real error */
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +02001109
1110 switch (errno) {
1111 /* FIXME: is it possible to get ECONNREFUSED/ENETUNREACH with O_NONBLOCK? */
1112 case ECONNREFUSED:
1113 case ENETUNREACH:
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +02001114 set_server_check_status(s, HCHK_STATUS_L4CON, strerror(errno));
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +02001115 break;
1116
1117 default:
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +02001118 set_server_check_status(s, HCHK_STATUS_SOCKERR, strerror(errno));
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +02001119 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001120 }
1121 }
1122 }
Willy Tarreau8d5d77e2009-10-18 07:25:52 +02001123 port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port);
1124 fdinfo[fd].port_range = NULL;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001125 close(fd); /* socket creation error */
1126 }
1127
Willy Tarreauc7dd71a2007-11-30 08:33:21 +01001128 if (s->result == SRV_CHK_UNKNOWN) { /* nothing done */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001129 //fprintf(stderr, "process_chk: 6\n");
Willy Tarreau0c303ee2008-07-07 00:09:58 +02001130 while (tick_is_expired(t->expire, now_ms))
1131 t->expire = tick_add(t->expire, MS_TO_TICKS(s->inter));
Willy Tarreaubaaee002006-06-26 02:48:02 +02001132 goto new_chk; /* may be we should initialize a new check */
1133 }
1134
1135 /* here, we have seen a failure */
1136 if (s->health > s->rise) {
1137 s->health--; /* still good */
Krzysztof Piotr Oledzki052d4fd2009-10-04 14:52:57 +02001138 s->counters.failed_checks++;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001139 }
1140 else
1141 set_server_down(s);
1142
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001143 //fprintf(stderr, "process_chk: 7, %lu\n", __tv_to_ms(&s->proxy->timeout.connect));
1144 /* we allow up to min(inter, timeout.connect) for a connection
1145 * to establish but only when timeout.check is set
1146 * as it may be to short for a full check otherwise
1147 */
Willy Tarreau0c303ee2008-07-07 00:09:58 +02001148 while (tick_is_expired(t->expire, now_ms)) {
1149 int t_con;
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001150
Willy Tarreau0c303ee2008-07-07 00:09:58 +02001151 t_con = tick_add(t->expire, s->proxy->timeout.connect);
1152 t->expire = tick_add(t->expire, MS_TO_TICKS(s->inter));
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001153
Willy Tarreau0c303ee2008-07-07 00:09:58 +02001154 if (s->proxy->timeout.check)
1155 t->expire = tick_first(t->expire, t_con);
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001156 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001157 goto new_chk;
1158 }
1159 else {
1160 //fprintf(stderr, "process_chk: 8\n");
1161 /* there was a test running */
Willy Tarreauc7dd71a2007-11-30 08:33:21 +01001162 if ((s->result & (SRV_CHK_ERROR|SRV_CHK_RUNNING)) == SRV_CHK_RUNNING) { /* good server detected */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001163 //fprintf(stderr, "process_chk: 9\n");
Krzysztof Oledzki85130942007-10-22 16:21:10 +02001164
Willy Tarreau9909fc12007-11-30 17:42:05 +01001165 if (s->state & SRV_WARMINGUP) {
1166 if (now.tv_sec < s->last_change || now.tv_sec >= s->last_change + s->slowstart) {
1167 s->state &= ~SRV_WARMINGUP;
1168 if (s->proxy->lbprm.algo & BE_LB_PROP_DYN)
1169 s->eweight = s->uweight * BE_WEIGHT_SCALE;
1170 if (s->proxy->lbprm.update_server_eweight)
1171 s->proxy->lbprm.update_server_eweight(s);
1172 }
1173 else if (s->proxy->lbprm.algo & BE_LB_PROP_DYN) {
1174 /* for dynamic algorithms, let's update the weight */
Willy Tarreau5542af62007-12-03 02:04:00 +01001175 s->eweight = (BE_WEIGHT_SCALE * (now.tv_sec - s->last_change) +
1176 s->slowstart - 1) / s->slowstart;
Willy Tarreau9909fc12007-11-30 17:42:05 +01001177 s->eweight *= s->uweight;
1178 if (s->proxy->lbprm.update_server_eweight)
1179 s->proxy->lbprm.update_server_eweight(s);
1180 }
1181 /* probably that we can refill this server with a bit more connections */
1182 check_for_pending(s);
1183 }
1184
Willy Tarreau48494c02007-11-30 10:41:39 +01001185 /* we may have to add/remove this server from the LB group */
1186 if ((s->state & SRV_RUNNING) && (s->proxy->options & PR_O_DISABLE404)) {
1187 if ((s->state & SRV_GOINGDOWN) &&
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +01001188 ((s->result & (SRV_CHK_RUNNING|SRV_CHK_DISABLE)) == SRV_CHK_RUNNING))
1189 set_server_enabled(s);
Willy Tarreau48494c02007-11-30 10:41:39 +01001190 else if (!(s->state & SRV_GOINGDOWN) &&
1191 ((s->result & (SRV_CHK_RUNNING | SRV_CHK_DISABLE)) ==
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +01001192 (SRV_CHK_RUNNING | SRV_CHK_DISABLE)))
1193 set_server_disabled(s);
Willy Tarreau48494c02007-11-30 10:41:39 +01001194 }
1195
Krzysztof Oledzki85130942007-10-22 16:21:10 +02001196 if (s->health < s->rise + s->fall - 1) {
1197 s->health++; /* was bad, stays for a while */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001198
Krzysztof Piotr Oledzkic8b16fc2008-02-18 01:26:35 +01001199 set_server_up(s);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001200 }
1201 s->curfd = -1; /* no check running anymore */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001202 fd_delete(fd);
Willy Tarreau44ec0f02007-10-14 23:47:04 +02001203
1204 rv = 0;
1205 if (global.spread_checks > 0) {
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001206 rv = srv_getinter(s) * global.spread_checks / 100;
Willy Tarreau44ec0f02007-10-14 23:47:04 +02001207 rv -= (int) (2 * rv * (rand() / (RAND_MAX + 1.0)));
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001208 //fprintf(stderr, "process_chk(%p): (%d+/-%d%%) random=%d\n", s, srv_getinter(s), global.spread_checks, rv);
Willy Tarreau44ec0f02007-10-14 23:47:04 +02001209 }
Willy Tarreau0c303ee2008-07-07 00:09:58 +02001210 t->expire = tick_add(now_ms, MS_TO_TICKS(srv_getinter(s) + rv));
Willy Tarreaubaaee002006-06-26 02:48:02 +02001211 goto new_chk;
1212 }
Willy Tarreau0c303ee2008-07-07 00:09:58 +02001213 else if ((s->result & SRV_CHK_ERROR) || tick_is_expired(t->expire, now_ms)) {
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +02001214 if (!(s->result & SRV_CHK_ERROR)) {
1215 if (!EV_FD_ISSET(fd, DIR_RD)) {
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +02001216 set_server_check_status(s, HCHK_STATUS_L4TOUT, NULL);
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +02001217 } else {
1218 if (s->proxy->options & PR_O_SSL3_CHK)
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +02001219 set_server_check_status(s, HCHK_STATUS_L6TOUT, NULL);
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +02001220 else /* HTTP, SMTP */
Krzysztof Piotr Oledzkif7089f52009-10-10 21:06:49 +02001221 set_server_check_status(s, HCHK_STATUS_L7TOUT, NULL);
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +02001222 }
1223 }
1224
Willy Tarreaubaaee002006-06-26 02:48:02 +02001225 //fprintf(stderr, "process_chk: 10\n");
1226 /* failure or timeout detected */
1227 if (s->health > s->rise) {
1228 s->health--; /* still good */
Krzysztof Piotr Oledzki052d4fd2009-10-04 14:52:57 +02001229 s->counters.failed_checks++;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001230 }
1231 else
1232 set_server_down(s);
1233 s->curfd = -1;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001234 fd_delete(fd);
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +02001235
1236 rv = 0;
1237 if (global.spread_checks > 0) {
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001238 rv = srv_getinter(s) * global.spread_checks / 100;
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +02001239 rv -= (int) (2 * rv * (rand() / (RAND_MAX + 1.0)));
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001240 //fprintf(stderr, "process_chk(%p): (%d+/-%d%%) random=%d\n", s, srv_getinter(s), global.spread_checks, rv);
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +02001241 }
Willy Tarreau0c303ee2008-07-07 00:09:58 +02001242 t->expire = tick_add(now_ms, MS_TO_TICKS(srv_getinter(s) + rv));
Willy Tarreaubaaee002006-06-26 02:48:02 +02001243 goto new_chk;
1244 }
Willy Tarreauc7dd71a2007-11-30 08:33:21 +01001245 /* if result is unknown and there's no timeout, we have to wait again */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001246 }
1247 //fprintf(stderr, "process_chk: 11\n");
Willy Tarreauc7dd71a2007-11-30 08:33:21 +01001248 s->result = SRV_CHK_UNKNOWN;
Willy Tarreau26c25062009-03-08 09:38:41 +01001249 return t;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001250}
1251
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +02001252/*
1253 * Start health-check.
1254 * Returns 0 if OK, -1 if error, and prints the error in this case.
1255 */
1256int start_checks() {
1257
1258 struct proxy *px;
1259 struct server *s;
1260 struct task *t;
1261 int nbchk=0, mininter=0, srvpos=0;
1262
Willy Tarreau2c43a1e2007-10-14 23:05:39 +02001263 /* 1- count the checkers to run simultaneously.
1264 * We also determine the minimum interval among all of those which
1265 * have an interval larger than SRV_CHK_INTER_THRES. This interval
1266 * will be used to spread their start-up date. Those which have
1267 * a shorter interval will start independantly and will not dictate
1268 * too short an interval for all others.
1269 */
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +02001270 for (px = proxy; px; px = px->next) {
1271 for (s = px->srv; s; s = s->next) {
1272 if (!(s->state & SRV_CHECKED))
1273 continue;
1274
Krzysztof Piotr Oledzki5259dfe2008-01-21 01:54:06 +01001275 if ((srv_getinter(s) >= SRV_CHK_INTER_THRES) &&
1276 (!mininter || mininter > srv_getinter(s)))
1277 mininter = srv_getinter(s);
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +02001278
1279 nbchk++;
1280 }
1281 }
1282
1283 if (!nbchk)
1284 return 0;
1285
1286 srand((unsigned)time(NULL));
1287
1288 /*
1289 * 2- start them as far as possible from each others. For this, we will
1290 * start them after their interval set to the min interval divided by
1291 * the number of servers, weighted by the server's position in the list.
1292 */
1293 for (px = proxy; px; px = px->next) {
1294 for (s = px->srv; s; s = s->next) {
1295 if (!(s->state & SRV_CHECKED))
1296 continue;
1297
Willy Tarreaua4613182009-03-21 18:13:21 +01001298 if ((t = task_new()) == NULL) {
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +02001299 Alert("Starting [%s:%s] check: out of memory.\n", px->id, s->id);
1300 return -1;
1301 }
1302
Krzysztof Piotr Oledzkia643baf2008-05-29 23:53:44 +02001303 s->check = t;
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +02001304 t->process = process_chk;
1305 t->context = s;
1306
1307 /* check this every ms */
Willy Tarreau0c303ee2008-07-07 00:09:58 +02001308 t->expire = tick_add(now_ms,
1309 MS_TO_TICKS(((mininter && mininter >= srv_getinter(s)) ?
1310 mininter : srv_getinter(s)) * srvpos / nbchk));
Krzysztof Piotr Oledzki09605412009-09-23 22:09:24 +02001311 s->check_start = now;
Krzysztof Oledzkib304dc72007-10-14 23:40:01 +02001312 task_queue(t);
1313
1314 srvpos++;
1315 }
1316 }
1317 return 0;
1318}
Willy Tarreaubaaee002006-06-26 02:48:02 +02001319
1320/*
1321 * Local variables:
1322 * c-indent-level: 8
1323 * c-basic-offset: 8
1324 * End:
1325 */