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Commit | Line | Data |
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c53ca1e0 | 1 | /* |
bccb7ded | 2 | * sslproc.c: An interface to wsockd |
c53ca1e0 AC |
3 | * Copyright (C) 2007 Aaron Sethman <androsyn@ratbox.org> |
4 | * Copyright (C) 2007 ircd-ratbox development team | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 | |
19 | * USA | |
20 | */ | |
21 | ||
22 | #include <rb_lib.h> | |
23 | #include "stdinc.h" | |
24 | ||
25 | ||
26 | #include "s_conf.h" | |
27 | #include "logger.h" | |
28 | #include "listener.h" | |
29 | #include "wsproc.h" | |
30 | #include "s_serv.h" | |
31 | #include "ircd.h" | |
32 | #include "hash.h" | |
33 | #include "client.h" | |
34 | #include "send.h" | |
35 | #include "packet.h" | |
36 | ||
37 | static void ws_read_ctl(rb_fde_t * F, void *data); | |
38 | static int wsockd_count; | |
39 | ||
c53ca1e0 AC |
40 | #define MAXPASSFD 4 |
41 | #define READSIZE 1024 | |
42 | typedef struct _ws_ctl_buf | |
43 | { | |
44 | rb_dlink_node node; | |
45 | char *buf; | |
46 | size_t buflen; | |
47 | rb_fde_t *F[MAXPASSFD]; | |
48 | int nfds; | |
49 | } ws_ctl_buf_t; | |
50 | ||
51 | ||
52 | struct ws_ctl | |
53 | { | |
54 | rb_dlink_node node; | |
55 | int cli_count; | |
56 | rb_fde_t *F; | |
57 | rb_fde_t *P; | |
58 | pid_t pid; | |
59 | rb_dlink_list readq; | |
60 | rb_dlink_list writeq; | |
61 | uint8_t shutdown; | |
62 | uint8_t dead; | |
63 | }; | |
64 | ||
65 | static rb_dlink_list wsock_daemons; | |
66 | ||
67 | static inline uint32_t | |
68 | buf_to_uint32(char *buf) | |
69 | { | |
70 | uint32_t x; | |
71 | memcpy(&x, buf, sizeof(x)); | |
72 | return x; | |
73 | } | |
74 | ||
75 | static inline void | |
76 | uint32_to_buf(char *buf, uint32_t x) | |
77 | { | |
78 | memcpy(buf, &x, sizeof(x)); | |
79 | return; | |
80 | } | |
81 | ||
82 | static ws_ctl_t * | |
83 | allocate_ws_daemon(rb_fde_t * F, rb_fde_t * P, int pid) | |
84 | { | |
85 | ws_ctl_t *ctl; | |
86 | ||
87 | if(F == NULL || pid < 0) | |
88 | return NULL; | |
89 | ctl = rb_malloc(sizeof(ws_ctl_t)); | |
90 | ctl->F = F; | |
91 | ctl->P = P; | |
92 | ctl->pid = pid; | |
93 | wsockd_count++; | |
94 | rb_dlinkAdd(ctl, &ctl->node, &wsock_daemons); | |
95 | return ctl; | |
96 | } | |
97 | ||
98 | static void | |
99 | free_ws_daemon(ws_ctl_t * ctl) | |
100 | { | |
101 | rb_dlink_node *ptr; | |
102 | ws_ctl_buf_t *ctl_buf; | |
103 | int x; | |
104 | if(ctl->cli_count) | |
105 | return; | |
106 | ||
107 | RB_DLINK_FOREACH(ptr, ctl->readq.head) | |
108 | { | |
109 | ctl_buf = ptr->data; | |
110 | for(x = 0; x < ctl_buf->nfds; x++) | |
111 | rb_close(ctl_buf->F[x]); | |
112 | ||
113 | rb_free(ctl_buf->buf); | |
114 | rb_free(ctl_buf); | |
115 | } | |
116 | ||
117 | RB_DLINK_FOREACH(ptr, ctl->writeq.head) | |
118 | { | |
119 | ctl_buf = ptr->data; | |
120 | for(x = 0; x < ctl_buf->nfds; x++) | |
121 | rb_close(ctl_buf->F[x]); | |
122 | ||
123 | rb_free(ctl_buf->buf); | |
124 | rb_free(ctl_buf); | |
125 | } | |
126 | rb_close(ctl->F); | |
127 | rb_close(ctl->P); | |
128 | rb_dlinkDelete(&ctl->node, &wsock_daemons); | |
129 | rb_free(ctl); | |
130 | } | |
131 | ||
132 | static char *wsockd_path; | |
133 | ||
134 | static int wsockd_spin_count = 0; | |
135 | static time_t last_spin; | |
136 | static int wsockd_wait = 0; | |
137 | ||
138 | void | |
139 | restart_wsockd(void) | |
140 | { | |
141 | rb_dlink_node *ptr, *next; | |
142 | ws_ctl_t *ctl; | |
143 | ||
144 | RB_DLINK_FOREACH_SAFE(ptr, next, wsock_daemons.head) | |
145 | { | |
146 | ctl = ptr->data; | |
147 | if(ctl->dead) | |
148 | continue; | |
149 | if(ctl->shutdown) | |
150 | continue; | |
151 | ctl->shutdown = 1; | |
152 | wsockd_count--; | |
153 | if(!ctl->cli_count) | |
154 | { | |
155 | rb_kill(ctl->pid, SIGKILL); | |
156 | free_ws_daemon(ctl); | |
157 | } | |
158 | } | |
159 | ||
160 | start_wsockd(ServerInfo.wsockd_count); | |
161 | } | |
162 | ||
9a9bc518 | 163 | #if 0 |
c53ca1e0 AC |
164 | static void |
165 | ws_killall(void) | |
166 | { | |
167 | rb_dlink_node *ptr, *next; | |
168 | ws_ctl_t *ctl; | |
169 | RB_DLINK_FOREACH_SAFE(ptr, next, wsock_daemons.head) | |
170 | { | |
171 | ctl = ptr->data; | |
172 | if(ctl->dead) | |
173 | continue; | |
174 | ctl->dead = 1; | |
175 | if(!ctl->shutdown) | |
176 | wsockd_count--; | |
177 | rb_kill(ctl->pid, SIGKILL); | |
178 | if(!ctl->cli_count) | |
179 | free_ws_daemon(ctl); | |
180 | } | |
181 | } | |
9a9bc518 | 182 | #endif |
c53ca1e0 AC |
183 | |
184 | static void | |
185 | ws_dead(ws_ctl_t * ctl) | |
186 | { | |
187 | if(ctl->dead) | |
188 | return; | |
189 | ||
190 | ctl->dead = 1; | |
191 | rb_kill(ctl->pid, SIGKILL); /* make sure the process is really gone */ | |
192 | ||
193 | if(!ctl->shutdown) | |
194 | { | |
195 | wsockd_count--; | |
196 | ilog(L_MAIN, "wsockd helper died - attempting to restart"); | |
a9227555 | 197 | sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "wsockd helper died - attempting to restart"); |
c53ca1e0 AC |
198 | start_wsockd(1); |
199 | } | |
200 | } | |
201 | ||
202 | static void | |
203 | ws_do_pipe(rb_fde_t * F, void *data) | |
204 | { | |
205 | int retlen; | |
206 | ws_ctl_t *ctl = data; | |
207 | retlen = rb_write(F, "0", 1); | |
208 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
209 | { | |
210 | ws_dead(ctl); | |
211 | return; | |
212 | } | |
213 | rb_setselect(F, RB_SELECT_READ, ws_do_pipe, data); | |
214 | } | |
215 | ||
216 | static void | |
bccb7ded | 217 | restart_wsockd_event(void *unused) |
c53ca1e0 AC |
218 | { |
219 | wsockd_spin_count = 0; | |
220 | last_spin = 0; | |
221 | wsockd_wait = 0; | |
222 | if(ServerInfo.wsockd_count > get_wsockd_count()) | |
223 | { | |
224 | int start = ServerInfo.wsockd_count - get_wsockd_count(); | |
225 | ilog(L_MAIN, "Attempting to restart wsockd processes"); | |
a9227555 | 226 | sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "Attempting to restart wsockd processes"); |
c53ca1e0 AC |
227 | start_wsockd(start); |
228 | } | |
229 | } | |
230 | ||
231 | int | |
232 | start_wsockd(int count) | |
233 | { | |
234 | rb_fde_t *F1, *F2; | |
235 | rb_fde_t *P1, *P2; | |
c53ca1e0 AC |
236 | char fullpath[PATH_MAX + 1]; |
237 | char fdarg[6]; | |
238 | const char *parv[2]; | |
239 | char buf[128]; | |
240 | char s_pid[10]; | |
241 | pid_t pid; | |
242 | int started = 0, i; | |
243 | ||
244 | if(wsockd_wait) | |
245 | return 0; | |
246 | ||
247 | if(wsockd_spin_count > 20 && (rb_current_time() - last_spin < 5)) | |
248 | { | |
bccb7ded | 249 | ilog(L_MAIN, "wsockd helper is spinning - will attempt to restart in 1 minute"); |
a9227555 | 250 | sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, |
bccb7ded AC |
251 | "wsockd helper is spinning - will attempt to restart in 1 minute"); |
252 | rb_event_add("restart_wsockd_event", restart_wsockd_event, NULL, 60); | |
c53ca1e0 AC |
253 | wsockd_wait = 1; |
254 | return 0; | |
255 | } | |
256 | ||
257 | wsockd_spin_count++; | |
258 | last_spin = rb_current_time(); | |
259 | ||
260 | if(wsockd_path == NULL) | |
261 | { | |
8f0c3422 | 262 | snprintf(fullpath, sizeof(fullpath), "%s/wsockd", ircd_paths[IRCD_PATH_LIBEXEC]); |
c53ca1e0 AC |
263 | |
264 | if(access(fullpath, X_OK) == -1) | |
265 | { | |
8f0c3422 | 266 | snprintf(fullpath, sizeof(fullpath), "%s/bin/wsockd", ConfigFileEntry.dpath); |
c53ca1e0 AC |
267 | if(access(fullpath, X_OK) == -1) |
268 | { | |
269 | ilog(L_MAIN, | |
8f0c3422 | 270 | "Unable to execute wsockd in %s or %s/bin", |
271 | ircd_paths[IRCD_PATH_LIBEXEC], ConfigFileEntry.dpath); | |
c53ca1e0 AC |
272 | return 0; |
273 | } | |
274 | } | |
275 | wsockd_path = rb_strdup(fullpath); | |
276 | } | |
bccb7ded | 277 | rb_strlcpy(buf, "-ircd wsockd daemon", sizeof(buf)); |
c53ca1e0 AC |
278 | parv[0] = buf; |
279 | parv[1] = NULL; | |
280 | ||
281 | for(i = 0; i < count; i++) | |
282 | { | |
283 | ws_ctl_t *ctl; | |
284 | if(rb_socketpair(AF_UNIX, SOCK_DGRAM, 0, &F1, &F2, "wsockd handle passing socket") == -1) | |
285 | { | |
286 | ilog(L_MAIN, "Unable to create wsockd - rb_socketpair failed: %s", strerror(errno)); | |
287 | return started; | |
288 | } | |
289 | ||
290 | rb_set_buffers(F1, READBUF_SIZE); | |
291 | rb_set_buffers(F2, READBUF_SIZE); | |
292 | snprintf(fdarg, sizeof(fdarg), "%d", rb_get_fd(F2)); | |
293 | rb_setenv("CTL_FD", fdarg, 1); | |
294 | if(rb_pipe(&P1, &P2, "wsockd pipe") == -1) | |
295 | { | |
296 | ilog(L_MAIN, "Unable to create wsockd - rb_pipe failed: %s", strerror(errno)); | |
297 | return started; | |
298 | } | |
299 | snprintf(fdarg, sizeof(fdarg), "%d", rb_get_fd(P1)); | |
300 | rb_setenv("CTL_PIPE", fdarg, 1); | |
301 | snprintf(s_pid, sizeof(s_pid), "%d", (int)getpid()); | |
302 | rb_setenv("CTL_PPID", s_pid, 1); | |
303 | ||
12fd6e80 DF |
304 | rb_clear_cloexec(F2); |
305 | rb_clear_cloexec(P1); | |
c53ca1e0 AC |
306 | |
307 | pid = rb_spawn_process(wsockd_path, (const char **) parv); | |
308 | if(pid == -1) | |
309 | { | |
bccb7ded | 310 | ilog(L_MAIN, "Unable to create wsockd: %s\n", strerror(errno)); |
c53ca1e0 AC |
311 | rb_close(F1); |
312 | rb_close(F2); | |
313 | rb_close(P1); | |
314 | rb_close(P2); | |
315 | return started; | |
316 | } | |
317 | started++; | |
318 | rb_close(F2); | |
319 | rb_close(P1); | |
320 | ctl = allocate_ws_daemon(F1, P2, pid); | |
321 | ws_read_ctl(ctl->F, ctl); | |
322 | ws_do_pipe(P2, ctl); | |
323 | ||
324 | } | |
325 | return started; | |
326 | } | |
327 | ||
328 | static void | |
329 | ws_process_dead_fd(ws_ctl_t * ctl, ws_ctl_buf_t * ctl_buf) | |
330 | { | |
331 | struct Client *client_p; | |
332 | char reason[256]; | |
333 | uint32_t fd; | |
334 | ||
335 | if(ctl_buf->buflen < 6) | |
336 | return; /* bogus message..drop it.. XXX should warn here */ | |
337 | ||
338 | fd = buf_to_uint32(&ctl_buf->buf[1]); | |
339 | rb_strlcpy(reason, &ctl_buf->buf[5], sizeof(reason)); | |
340 | client_p = find_cli_connid_hash(fd); | |
341 | if(client_p == NULL) | |
342 | return; | |
343 | if(IsAnyServer(client_p) || IsRegistered(client_p)) | |
344 | { | |
345 | /* read any last moment ERROR, QUIT or the like -- jilles */ | |
346 | if (!strcmp(reason, "Remote host closed the connection")) | |
347 | read_packet(client_p->localClient->F, client_p); | |
348 | if (IsAnyDead(client_p)) | |
349 | return; | |
350 | } | |
351 | exit_client(client_p, client_p, &me, reason); | |
352 | } | |
353 | ||
354 | ||
355 | static void | |
356 | ws_process_cmd_recv(ws_ctl_t * ctl) | |
357 | { | |
c53ca1e0 AC |
358 | rb_dlink_node *ptr, *next; |
359 | ws_ctl_buf_t *ctl_buf; | |
c53ca1e0 AC |
360 | |
361 | if(ctl->dead) | |
362 | return; | |
363 | ||
364 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head) | |
365 | { | |
366 | ctl_buf = ptr->data; | |
367 | switch (*ctl_buf->buf) | |
368 | { | |
369 | case 'D': | |
370 | ws_process_dead_fd(ctl, ctl_buf); | |
371 | break; | |
372 | default: | |
bccb7ded | 373 | ilog(L_MAIN, "Received invalid command from wsockd: %s", ctl_buf->buf); |
a9227555 | 374 | sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "Received invalid command from wsockd"); |
c53ca1e0 AC |
375 | break; |
376 | } | |
377 | rb_dlinkDelete(ptr, &ctl->readq); | |
378 | rb_free(ctl_buf->buf); | |
379 | rb_free(ctl_buf); | |
380 | } | |
381 | ||
382 | } | |
383 | ||
384 | ||
385 | static void | |
386 | ws_read_ctl(rb_fde_t * F, void *data) | |
387 | { | |
388 | ws_ctl_buf_t *ctl_buf; | |
389 | ws_ctl_t *ctl = data; | |
390 | int retlen; | |
391 | ||
392 | if(ctl->dead) | |
393 | return; | |
394 | do | |
395 | { | |
396 | ctl_buf = rb_malloc(sizeof(ws_ctl_buf_t)); | |
397 | ctl_buf->buf = rb_malloc(READSIZE); | |
398 | retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, READSIZE, ctl_buf->F, 4); | |
399 | ctl_buf->buflen = retlen; | |
400 | if(retlen <= 0) | |
401 | { | |
402 | rb_free(ctl_buf->buf); | |
403 | rb_free(ctl_buf); | |
404 | } | |
405 | else | |
406 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq); | |
407 | } | |
408 | while(retlen > 0); | |
409 | ||
410 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
411 | { | |
412 | ws_dead(ctl); | |
413 | return; | |
414 | } | |
415 | ws_process_cmd_recv(ctl); | |
416 | rb_setselect(ctl->F, RB_SELECT_READ, ws_read_ctl, ctl); | |
417 | } | |
418 | ||
419 | static ws_ctl_t * | |
420 | which_wsockd(void) | |
421 | { | |
422 | ws_ctl_t *ctl, *lowest = NULL; | |
423 | rb_dlink_node *ptr; | |
424 | ||
425 | RB_DLINK_FOREACH(ptr, wsock_daemons.head) | |
426 | { | |
427 | ctl = ptr->data; | |
428 | if(ctl->dead) | |
429 | continue; | |
430 | if(ctl->shutdown) | |
431 | continue; | |
432 | if(lowest == NULL) | |
433 | { | |
434 | lowest = ctl; | |
435 | continue; | |
436 | } | |
437 | if(ctl->cli_count < lowest->cli_count) | |
438 | lowest = ctl; | |
439 | } | |
440 | ||
441 | return (lowest); | |
442 | } | |
443 | ||
444 | static void | |
445 | ws_write_ctl(rb_fde_t * F, void *data) | |
446 | { | |
447 | ws_ctl_t *ctl = data; | |
448 | ws_ctl_buf_t *ctl_buf; | |
449 | rb_dlink_node *ptr, *next; | |
450 | int retlen, x; | |
451 | ||
452 | if(ctl->dead) | |
453 | return; | |
454 | ||
455 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head) | |
456 | { | |
457 | ctl_buf = ptr->data; | |
458 | /* in theory unix sock_dgram shouldn't ever short write this.. */ | |
459 | retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf, ctl_buf->buflen, ctl->pid); | |
460 | if(retlen > 0) | |
461 | { | |
462 | rb_dlinkDelete(ptr, &ctl->writeq); | |
463 | for(x = 0; x < ctl_buf->nfds; x++) | |
464 | rb_close(ctl_buf->F[x]); | |
465 | rb_free(ctl_buf->buf); | |
466 | rb_free(ctl_buf); | |
467 | ||
468 | } | |
469 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
470 | { | |
471 | ws_dead(ctl); | |
472 | return; | |
473 | } | |
474 | else | |
475 | { | |
476 | rb_setselect(ctl->F, RB_SELECT_WRITE, ws_write_ctl, ctl); | |
477 | } | |
478 | } | |
479 | } | |
480 | ||
481 | static void | |
482 | ws_cmd_write_queue(ws_ctl_t * ctl, rb_fde_t ** F, int count, const void *buf, size_t buflen) | |
483 | { | |
484 | ws_ctl_buf_t *ctl_buf; | |
485 | int x; | |
486 | ||
487 | /* don't bother */ | |
488 | if(ctl->dead) | |
489 | return; | |
490 | ||
491 | ctl_buf = rb_malloc(sizeof(ws_ctl_buf_t)); | |
492 | ctl_buf->buf = rb_malloc(buflen); | |
493 | memcpy(ctl_buf->buf, buf, buflen); | |
494 | ctl_buf->buflen = buflen; | |
495 | ||
496 | for(x = 0; x < count && x < MAXPASSFD; x++) | |
497 | { | |
498 | ctl_buf->F[x] = F[x]; | |
499 | } | |
500 | ctl_buf->nfds = count; | |
501 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->writeq); | |
502 | ws_write_ctl(ctl->F, ctl); | |
503 | } | |
504 | ||
505 | ws_ctl_t * | |
506 | start_wsockd_accept(rb_fde_t * sslF, rb_fde_t * plainF, uint32_t id) | |
507 | { | |
508 | rb_fde_t *F[2]; | |
509 | ws_ctl_t *ctl; | |
510 | char buf[5]; | |
511 | F[0] = sslF; | |
512 | F[1] = plainF; | |
513 | ||
514 | buf[0] = 'A'; | |
515 | uint32_to_buf(&buf[1], id); | |
516 | ctl = which_wsockd(); | |
517 | if(!ctl) | |
518 | return NULL; | |
519 | ctl->cli_count++; | |
520 | ws_cmd_write_queue(ctl, F, 2, buf, sizeof(buf)); | |
521 | return ctl; | |
522 | } | |
523 | ||
524 | void | |
525 | wsockd_decrement_clicount(ws_ctl_t * ctl) | |
526 | { | |
527 | if(ctl == NULL) | |
528 | return; | |
529 | ||
530 | ctl->cli_count--; | |
531 | if(ctl->shutdown && !ctl->cli_count) | |
532 | { | |
533 | ctl->dead = 1; | |
534 | rb_kill(ctl->pid, SIGKILL); | |
535 | } | |
536 | if(ctl->dead && !ctl->cli_count) | |
537 | { | |
538 | free_ws_daemon(ctl); | |
539 | } | |
540 | } | |
541 | ||
542 | static void | |
543 | cleanup_dead_ws(void *unused) | |
544 | { | |
545 | rb_dlink_node *ptr, *next; | |
546 | ws_ctl_t *ctl; | |
547 | RB_DLINK_FOREACH_SAFE(ptr, next, wsock_daemons.head) | |
548 | { | |
549 | ctl = ptr->data; | |
550 | if(ctl->dead && !ctl->cli_count) | |
551 | { | |
552 | free_ws_daemon(ctl); | |
553 | } | |
554 | } | |
555 | } | |
556 | ||
557 | int | |
558 | get_wsockd_count(void) | |
559 | { | |
560 | return wsockd_count; | |
561 | } | |
562 | ||
563 | void | |
564 | wsockd_foreach_info(void (*func)(void *data, pid_t pid, int cli_count, enum wsockd_status status), void *data) | |
565 | { | |
566 | rb_dlink_node *ptr, *next; | |
567 | ws_ctl_t *ctl; | |
568 | RB_DLINK_FOREACH_SAFE(ptr, next, wsock_daemons.head) | |
569 | { | |
570 | ctl = ptr->data; | |
571 | func(data, ctl->pid, ctl->cli_count, | |
572 | ctl->dead ? WSOCKD_DEAD : | |
573 | (ctl->shutdown ? WSOCKD_SHUTDOWN : WSOCKD_ACTIVE)); | |
574 | } | |
575 | } | |
576 | ||
577 | void | |
578 | init_wsockd(void) | |
579 | { | |
580 | rb_event_addish("cleanup_dead_ws", cleanup_dead_ws, NULL, 60); | |
581 | } |