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1 | /* | |
2 | * sslproc.c: An interface to wsockd | |
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 | ||
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 | ||
163 | #if 0 | |
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 | } | |
182 | #endif | |
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"); | |
197 | sendto_realops_snomask(SNO_GENERAL, L_ALL, "wsockd helper died - attempting to restart"); | |
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 | |
217 | restart_wsockd_event(void *unused) | |
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"); | |
226 | sendto_realops_snomask(SNO_GENERAL, L_ALL, "Attempting to restart wsockd processes"); | |
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; | |
236 | #ifdef _WIN32 | |
237 | const char *suffix = ".exe"; | |
238 | #else | |
239 | const char *suffix = ""; | |
240 | #endif | |
241 | ||
242 | char fullpath[PATH_MAX + 1]; | |
243 | char fdarg[6]; | |
244 | const char *parv[2]; | |
245 | char buf[128]; | |
246 | char s_pid[10]; | |
247 | pid_t pid; | |
248 | int started = 0, i; | |
249 | ||
250 | if(wsockd_wait) | |
251 | return 0; | |
252 | ||
253 | if(wsockd_spin_count > 20 && (rb_current_time() - last_spin < 5)) | |
254 | { | |
255 | ilog(L_MAIN, "wsockd helper is spinning - will attempt to restart in 1 minute"); | |
256 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
257 | "wsockd helper is spinning - will attempt to restart in 1 minute"); | |
258 | rb_event_add("restart_wsockd_event", restart_wsockd_event, NULL, 60); | |
259 | wsockd_wait = 1; | |
260 | return 0; | |
261 | } | |
262 | ||
263 | wsockd_spin_count++; | |
264 | last_spin = rb_current_time(); | |
265 | ||
266 | if(wsockd_path == NULL) | |
267 | { | |
268 | snprintf(fullpath, sizeof(fullpath), "%s%cwsockd%s", ircd_paths[IRCD_PATH_LIBEXEC], RB_PATH_SEPARATOR, suffix); | |
269 | ||
270 | if(access(fullpath, X_OK) == -1) | |
271 | { | |
272 | snprintf(fullpath, sizeof(fullpath), "%s%cbin%cwsockd%s", | |
273 | ConfigFileEntry.dpath, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR, suffix); | |
274 | if(access(fullpath, X_OK) == -1) | |
275 | { | |
276 | ilog(L_MAIN, | |
277 | "Unable to execute wsockd%s in %s or %s/bin", | |
278 | suffix, ircd_paths[IRCD_PATH_LIBEXEC], ConfigFileEntry.dpath); | |
279 | return 0; | |
280 | } | |
281 | } | |
282 | wsockd_path = rb_strdup(fullpath); | |
283 | } | |
284 | rb_strlcpy(buf, "-ircd wsockd daemon", sizeof(buf)); | |
285 | parv[0] = buf; | |
286 | parv[1] = NULL; | |
287 | ||
288 | for(i = 0; i < count; i++) | |
289 | { | |
290 | ws_ctl_t *ctl; | |
291 | if(rb_socketpair(AF_UNIX, SOCK_DGRAM, 0, &F1, &F2, "wsockd handle passing socket") == -1) | |
292 | { | |
293 | ilog(L_MAIN, "Unable to create wsockd - rb_socketpair failed: %s", strerror(errno)); | |
294 | return started; | |
295 | } | |
296 | ||
297 | rb_set_buffers(F1, READBUF_SIZE); | |
298 | rb_set_buffers(F2, READBUF_SIZE); | |
299 | snprintf(fdarg, sizeof(fdarg), "%d", rb_get_fd(F2)); | |
300 | rb_setenv("CTL_FD", fdarg, 1); | |
301 | if(rb_pipe(&P1, &P2, "wsockd pipe") == -1) | |
302 | { | |
303 | ilog(L_MAIN, "Unable to create wsockd - rb_pipe failed: %s", strerror(errno)); | |
304 | return started; | |
305 | } | |
306 | snprintf(fdarg, sizeof(fdarg), "%d", rb_get_fd(P1)); | |
307 | rb_setenv("CTL_PIPE", fdarg, 1); | |
308 | snprintf(s_pid, sizeof(s_pid), "%d", (int)getpid()); | |
309 | rb_setenv("CTL_PPID", s_pid, 1); | |
310 | ||
311 | #ifdef _WIN32 | |
312 | SetHandleInformation((HANDLE) rb_get_fd(F2), HANDLE_FLAG_INHERIT, 1); | |
313 | SetHandleInformation((HANDLE) rb_get_fd(P1), HANDLE_FLAG_INHERIT, 1); | |
314 | #endif | |
315 | ||
316 | pid = rb_spawn_process(wsockd_path, (const char **) parv); | |
317 | if(pid == -1) | |
318 | { | |
319 | ilog(L_MAIN, "Unable to create wsockd: %s\n", strerror(errno)); | |
320 | rb_close(F1); | |
321 | rb_close(F2); | |
322 | rb_close(P1); | |
323 | rb_close(P2); | |
324 | return started; | |
325 | } | |
326 | started++; | |
327 | rb_close(F2); | |
328 | rb_close(P1); | |
329 | ctl = allocate_ws_daemon(F1, P2, pid); | |
330 | ws_read_ctl(ctl->F, ctl); | |
331 | ws_do_pipe(P2, ctl); | |
332 | ||
333 | } | |
334 | return started; | |
335 | } | |
336 | ||
337 | static void | |
338 | ws_process_dead_fd(ws_ctl_t * ctl, ws_ctl_buf_t * ctl_buf) | |
339 | { | |
340 | struct Client *client_p; | |
341 | char reason[256]; | |
342 | uint32_t fd; | |
343 | ||
344 | if(ctl_buf->buflen < 6) | |
345 | return; /* bogus message..drop it.. XXX should warn here */ | |
346 | ||
347 | fd = buf_to_uint32(&ctl_buf->buf[1]); | |
348 | rb_strlcpy(reason, &ctl_buf->buf[5], sizeof(reason)); | |
349 | client_p = find_cli_connid_hash(fd); | |
350 | if(client_p == NULL) | |
351 | return; | |
352 | if(IsAnyServer(client_p) || IsRegistered(client_p)) | |
353 | { | |
354 | /* read any last moment ERROR, QUIT or the like -- jilles */ | |
355 | if (!strcmp(reason, "Remote host closed the connection")) | |
356 | read_packet(client_p->localClient->F, client_p); | |
357 | if (IsAnyDead(client_p)) | |
358 | return; | |
359 | } | |
360 | exit_client(client_p, client_p, &me, reason); | |
361 | } | |
362 | ||
363 | ||
364 | static void | |
365 | ws_process_cmd_recv(ws_ctl_t * ctl) | |
366 | { | |
367 | rb_dlink_node *ptr, *next; | |
368 | ws_ctl_buf_t *ctl_buf; | |
369 | ||
370 | if(ctl->dead) | |
371 | return; | |
372 | ||
373 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head) | |
374 | { | |
375 | ctl_buf = ptr->data; | |
376 | switch (*ctl_buf->buf) | |
377 | { | |
378 | case 'D': | |
379 | ws_process_dead_fd(ctl, ctl_buf); | |
380 | break; | |
381 | default: | |
382 | ilog(L_MAIN, "Received invalid command from wsockd: %s", ctl_buf->buf); | |
383 | sendto_realops_snomask(SNO_GENERAL, L_ALL, "Received invalid command from wsockd"); | |
384 | break; | |
385 | } | |
386 | rb_dlinkDelete(ptr, &ctl->readq); | |
387 | rb_free(ctl_buf->buf); | |
388 | rb_free(ctl_buf); | |
389 | } | |
390 | ||
391 | } | |
392 | ||
393 | ||
394 | static void | |
395 | ws_read_ctl(rb_fde_t * F, void *data) | |
396 | { | |
397 | ws_ctl_buf_t *ctl_buf; | |
398 | ws_ctl_t *ctl = data; | |
399 | int retlen; | |
400 | ||
401 | if(ctl->dead) | |
402 | return; | |
403 | do | |
404 | { | |
405 | ctl_buf = rb_malloc(sizeof(ws_ctl_buf_t)); | |
406 | ctl_buf->buf = rb_malloc(READSIZE); | |
407 | retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, READSIZE, ctl_buf->F, 4); | |
408 | ctl_buf->buflen = retlen; | |
409 | if(retlen <= 0) | |
410 | { | |
411 | rb_free(ctl_buf->buf); | |
412 | rb_free(ctl_buf); | |
413 | } | |
414 | else | |
415 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq); | |
416 | } | |
417 | while(retlen > 0); | |
418 | ||
419 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
420 | { | |
421 | ws_dead(ctl); | |
422 | return; | |
423 | } | |
424 | ws_process_cmd_recv(ctl); | |
425 | rb_setselect(ctl->F, RB_SELECT_READ, ws_read_ctl, ctl); | |
426 | } | |
427 | ||
428 | static ws_ctl_t * | |
429 | which_wsockd(void) | |
430 | { | |
431 | ws_ctl_t *ctl, *lowest = NULL; | |
432 | rb_dlink_node *ptr; | |
433 | ||
434 | RB_DLINK_FOREACH(ptr, wsock_daemons.head) | |
435 | { | |
436 | ctl = ptr->data; | |
437 | if(ctl->dead) | |
438 | continue; | |
439 | if(ctl->shutdown) | |
440 | continue; | |
441 | if(lowest == NULL) | |
442 | { | |
443 | lowest = ctl; | |
444 | continue; | |
445 | } | |
446 | if(ctl->cli_count < lowest->cli_count) | |
447 | lowest = ctl; | |
448 | } | |
449 | ||
450 | return (lowest); | |
451 | } | |
452 | ||
453 | static void | |
454 | ws_write_ctl(rb_fde_t * F, void *data) | |
455 | { | |
456 | ws_ctl_t *ctl = data; | |
457 | ws_ctl_buf_t *ctl_buf; | |
458 | rb_dlink_node *ptr, *next; | |
459 | int retlen, x; | |
460 | ||
461 | if(ctl->dead) | |
462 | return; | |
463 | ||
464 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head) | |
465 | { | |
466 | ctl_buf = ptr->data; | |
467 | /* in theory unix sock_dgram shouldn't ever short write this.. */ | |
468 | retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf, ctl_buf->buflen, ctl->pid); | |
469 | if(retlen > 0) | |
470 | { | |
471 | rb_dlinkDelete(ptr, &ctl->writeq); | |
472 | for(x = 0; x < ctl_buf->nfds; x++) | |
473 | rb_close(ctl_buf->F[x]); | |
474 | rb_free(ctl_buf->buf); | |
475 | rb_free(ctl_buf); | |
476 | ||
477 | } | |
478 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
479 | { | |
480 | ws_dead(ctl); | |
481 | return; | |
482 | } | |
483 | else | |
484 | { | |
485 | rb_setselect(ctl->F, RB_SELECT_WRITE, ws_write_ctl, ctl); | |
486 | } | |
487 | } | |
488 | } | |
489 | ||
490 | static void | |
491 | ws_cmd_write_queue(ws_ctl_t * ctl, rb_fde_t ** F, int count, const void *buf, size_t buflen) | |
492 | { | |
493 | ws_ctl_buf_t *ctl_buf; | |
494 | int x; | |
495 | ||
496 | /* don't bother */ | |
497 | if(ctl->dead) | |
498 | return; | |
499 | ||
500 | ctl_buf = rb_malloc(sizeof(ws_ctl_buf_t)); | |
501 | ctl_buf->buf = rb_malloc(buflen); | |
502 | memcpy(ctl_buf->buf, buf, buflen); | |
503 | ctl_buf->buflen = buflen; | |
504 | ||
505 | for(x = 0; x < count && x < MAXPASSFD; x++) | |
506 | { | |
507 | ctl_buf->F[x] = F[x]; | |
508 | } | |
509 | ctl_buf->nfds = count; | |
510 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->writeq); | |
511 | ws_write_ctl(ctl->F, ctl); | |
512 | } | |
513 | ||
514 | ws_ctl_t * | |
515 | start_wsockd_accept(rb_fde_t * sslF, rb_fde_t * plainF, uint32_t id) | |
516 | { | |
517 | rb_fde_t *F[2]; | |
518 | ws_ctl_t *ctl; | |
519 | char buf[5]; | |
520 | F[0] = sslF; | |
521 | F[1] = plainF; | |
522 | ||
523 | buf[0] = 'A'; | |
524 | uint32_to_buf(&buf[1], id); | |
525 | ctl = which_wsockd(); | |
526 | if(!ctl) | |
527 | return NULL; | |
528 | ctl->cli_count++; | |
529 | ws_cmd_write_queue(ctl, F, 2, buf, sizeof(buf)); | |
530 | return ctl; | |
531 | } | |
532 | ||
533 | void | |
534 | wsockd_decrement_clicount(ws_ctl_t * ctl) | |
535 | { | |
536 | if(ctl == NULL) | |
537 | return; | |
538 | ||
539 | ctl->cli_count--; | |
540 | if(ctl->shutdown && !ctl->cli_count) | |
541 | { | |
542 | ctl->dead = 1; | |
543 | rb_kill(ctl->pid, SIGKILL); | |
544 | } | |
545 | if(ctl->dead && !ctl->cli_count) | |
546 | { | |
547 | free_ws_daemon(ctl); | |
548 | } | |
549 | } | |
550 | ||
551 | static void | |
552 | cleanup_dead_ws(void *unused) | |
553 | { | |
554 | rb_dlink_node *ptr, *next; | |
555 | ws_ctl_t *ctl; | |
556 | RB_DLINK_FOREACH_SAFE(ptr, next, wsock_daemons.head) | |
557 | { | |
558 | ctl = ptr->data; | |
559 | if(ctl->dead && !ctl->cli_count) | |
560 | { | |
561 | free_ws_daemon(ctl); | |
562 | } | |
563 | } | |
564 | } | |
565 | ||
566 | int | |
567 | get_wsockd_count(void) | |
568 | { | |
569 | return wsockd_count; | |
570 | } | |
571 | ||
572 | void | |
573 | wsockd_foreach_info(void (*func)(void *data, pid_t pid, int cli_count, enum wsockd_status status), void *data) | |
574 | { | |
575 | rb_dlink_node *ptr, *next; | |
576 | ws_ctl_t *ctl; | |
577 | RB_DLINK_FOREACH_SAFE(ptr, next, wsock_daemons.head) | |
578 | { | |
579 | ctl = ptr->data; | |
580 | func(data, ctl->pid, ctl->cli_count, | |
581 | ctl->dead ? WSOCKD_DEAD : | |
582 | (ctl->shutdown ? WSOCKD_SHUTDOWN : WSOCKD_ACTIVE)); | |
583 | } | |
584 | } | |
585 | ||
586 | void | |
587 | init_wsockd(void) | |
588 | { | |
589 | rb_event_addish("cleanup_dead_ws", cleanup_dead_ws, NULL, 60); | |
590 | } |