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caebeeca AC |
1 | /* |
2 | * wsockd.c: charybdis websockets helper | |
3 | * Copyright (C) 2007 Aaron Sethman <androsyn@ratbox.org> | |
4 | * Copyright (C) 2007 ircd-ratbox development team | |
5 | * Copyright (C) 2016 William Pitcock <nenolod@dereferenced.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 | |
20 | * USA | |
21 | */ | |
22 | ||
23 | #include "stdinc.h" | |
24 | ||
25 | #define MAXPASSFD 4 | |
26 | #ifndef READBUF_SIZE | |
27 | #define READBUF_SIZE 16384 | |
28 | #endif | |
29 | ||
30 | static void setup_signals(void); | |
31 | static pid_t ppid; | |
32 | ||
33 | static inline uint32_t | |
34 | buf_to_uint32(uint8_t *buf) | |
35 | { | |
36 | uint32_t x; | |
37 | memcpy(&x, buf, sizeof(x)); | |
38 | return x; | |
39 | } | |
40 | ||
41 | static inline void | |
42 | uint32_to_buf(uint8_t *buf, uint32_t x) | |
43 | { | |
44 | memcpy(buf, &x, sizeof(x)); | |
45 | return; | |
46 | } | |
47 | ||
48 | typedef struct _mod_ctl_buf | |
49 | { | |
50 | rb_dlink_node node; | |
51 | uint8_t *buf; | |
52 | size_t buflen; | |
53 | rb_fde_t *F[MAXPASSFD]; | |
54 | int nfds; | |
55 | } mod_ctl_buf_t; | |
56 | ||
57 | typedef struct _mod_ctl | |
58 | { | |
59 | rb_dlink_node node; | |
60 | int cli_count; | |
61 | rb_fde_t *F; | |
62 | rb_fde_t *F_pipe; | |
63 | rb_dlink_list readq; | |
64 | rb_dlink_list writeq; | |
65 | } mod_ctl_t; | |
66 | ||
67 | static mod_ctl_t *mod_ctl; | |
68 | ||
69 | typedef struct _conn | |
70 | { | |
71 | rb_dlink_node node; | |
72 | mod_ctl_t *ctl; | |
73 | rawbuf_head_t *modbuf_out; | |
74 | rawbuf_head_t *plainbuf_out; | |
75 | ||
76 | uint32_t id; | |
77 | ||
78 | rb_fde_t *mod_fd; | |
79 | rb_fde_t *plain_fd; | |
80 | uint64_t mod_out; | |
81 | uint64_t mod_in; | |
82 | uint64_t plain_in; | |
83 | uint64_t plain_out; | |
84 | uint8_t flags; | |
caebeeca AC |
85 | } conn_t; |
86 | ||
87 | #define FLAG_CORK 0x01 | |
88 | #define FLAG_DEAD 0x02 | |
89 | #define FLAG_WSOCK 0x04 | |
90 | ||
91 | #define IsCork(x) ((x)->flags & FLAG_CORK) | |
92 | #define IsDead(x) ((x)->flags & FLAG_DEAD) | |
93 | #define IsWS(x) ((x)->flags & FLAG_WSOCK) | |
94 | ||
95 | #define SetCork(x) ((x)->flags |= FLAG_CORK) | |
96 | #define SetDead(x) ((x)->flags |= FLAG_DEAD) | |
97 | #define SetWS(x) ((x)->flags |= FLAG_WSOCK) | |
98 | ||
99 | #define ClearCork(x) ((x)->flags &= ~FLAG_CORK) | |
100 | #define ClearDead(x) ((x)->flags &= ~FLAG_DEAD) | |
101 | #define ClearWS(x) ((x)->flags &= ~FLAG_WSOCK) | |
102 | ||
103 | #define NO_WAIT 0x0 | |
104 | #define WAIT_PLAIN 0x1 | |
105 | ||
106 | #define HASH_WALK_SAFE(i, max, ptr, next, table) for(i = 0; i < max; i++) { RB_DLINK_FOREACH_SAFE(ptr, next, table[i].head) | |
107 | #define HASH_WALK_END } | |
108 | #define CONN_HASH_SIZE 2000 | |
109 | #define connid_hash(x) (&connid_hash_table[(x % CONN_HASH_SIZE)]) | |
110 | ||
111 | static rb_dlink_list connid_hash_table[CONN_HASH_SIZE]; | |
112 | static rb_dlink_list dead_list; | |
113 | ||
05e0aa9a AC |
114 | static void conn_plain_read_shutdown_cb(rb_fde_t *fd, void *data); |
115 | ||
caebeeca AC |
116 | #ifndef _WIN32 |
117 | static void | |
118 | dummy_handler(int sig) | |
119 | { | |
120 | return; | |
121 | } | |
122 | #endif | |
123 | ||
124 | static void | |
125 | setup_signals() | |
126 | { | |
127 | #ifndef _WIN32 | |
128 | struct sigaction act; | |
129 | ||
130 | act.sa_flags = 0; | |
131 | act.sa_handler = SIG_IGN; | |
132 | sigemptyset(&act.sa_mask); | |
133 | sigaddset(&act.sa_mask, SIGPIPE); | |
134 | sigaddset(&act.sa_mask, SIGALRM); | |
135 | #ifdef SIGTRAP | |
136 | sigaddset(&act.sa_mask, SIGTRAP); | |
137 | #endif | |
138 | ||
139 | #ifdef SIGWINCH | |
140 | sigaddset(&act.sa_mask, SIGWINCH); | |
141 | sigaction(SIGWINCH, &act, 0); | |
142 | #endif | |
143 | sigaction(SIGPIPE, &act, 0); | |
144 | #ifdef SIGTRAP | |
145 | sigaction(SIGTRAP, &act, 0); | |
146 | #endif | |
147 | ||
148 | act.sa_handler = dummy_handler; | |
149 | sigaction(SIGALRM, &act, 0); | |
150 | #endif | |
151 | } | |
152 | ||
153 | static int | |
154 | maxconn(void) | |
155 | { | |
156 | #if defined(RLIMIT_NOFILE) && defined(HAVE_SYS_RESOURCE_H) | |
157 | struct rlimit limit; | |
158 | ||
159 | if(!getrlimit(RLIMIT_NOFILE, &limit)) | |
160 | { | |
161 | return limit.rlim_cur; | |
162 | } | |
163 | #endif /* RLIMIT_FD_MAX */ | |
164 | return MAXCONNECTIONS; | |
165 | } | |
166 | ||
167 | static conn_t * | |
168 | conn_find_by_id(uint32_t id) | |
169 | { | |
170 | rb_dlink_node *ptr; | |
171 | conn_t *conn; | |
172 | ||
173 | RB_DLINK_FOREACH(ptr, (connid_hash(id))->head) | |
174 | { | |
175 | conn = ptr->data; | |
176 | if(conn->id == id && !IsDead(conn)) | |
177 | return conn; | |
178 | } | |
179 | return NULL; | |
180 | } | |
181 | ||
182 | static void | |
183 | conn_add_id_hash(conn_t * conn, uint32_t id) | |
184 | { | |
185 | conn->id = id; | |
186 | rb_dlinkAdd(conn, &conn->node, connid_hash(id)); | |
187 | } | |
188 | ||
189 | static void | |
190 | free_conn(conn_t * conn) | |
191 | { | |
192 | rb_free_rawbuffer(conn->modbuf_out); | |
193 | rb_free_rawbuffer(conn->plainbuf_out); | |
194 | rb_free(conn); | |
195 | } | |
196 | ||
197 | static void | |
198 | clean_dead_conns(void *unused) | |
199 | { | |
200 | conn_t *conn; | |
201 | rb_dlink_node *ptr, *next; | |
202 | ||
203 | RB_DLINK_FOREACH_SAFE(ptr, next, dead_list.head) | |
204 | { | |
205 | conn = ptr->data; | |
206 | free_conn(conn); | |
207 | } | |
208 | ||
209 | dead_list.tail = dead_list.head = NULL; | |
210 | } | |
211 | ||
05e0aa9a AC |
212 | static void |
213 | mod_write_ctl(rb_fde_t *F, void *data) | |
214 | { | |
215 | mod_ctl_t *ctl = data; | |
216 | mod_ctl_buf_t *ctl_buf; | |
217 | rb_dlink_node *ptr, *next; | |
218 | int retlen, x; | |
219 | ||
220 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head) | |
221 | { | |
222 | ctl_buf = ptr->data; | |
223 | retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf, | |
224 | ctl_buf->buflen, ppid); | |
225 | if(retlen > 0) | |
226 | { | |
227 | rb_dlinkDelete(ptr, &ctl->writeq); | |
228 | for(x = 0; x < ctl_buf->nfds; x++) | |
229 | rb_close(ctl_buf->F[x]); | |
230 | rb_free(ctl_buf->buf); | |
231 | rb_free(ctl_buf); | |
232 | ||
233 | } | |
234 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
235 | exit(0); | |
236 | ||
237 | } | |
238 | if(rb_dlink_list_length(&ctl->writeq) > 0) | |
239 | rb_setselect(ctl->F, RB_SELECT_WRITE, mod_write_ctl, ctl); | |
240 | } | |
241 | ||
242 | static void | |
243 | mod_cmd_write_queue(mod_ctl_t * ctl, const void *data, size_t len) | |
244 | { | |
245 | mod_ctl_buf_t *ctl_buf; | |
246 | ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t)); | |
247 | ctl_buf->buf = rb_malloc(len); | |
248 | ctl_buf->buflen = len; | |
249 | memcpy(ctl_buf->buf, data, len); | |
250 | ctl_buf->nfds = 0; | |
251 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->writeq); | |
252 | mod_write_ctl(ctl->F, ctl); | |
253 | } | |
254 | ||
255 | static void | |
256 | close_conn(conn_t * conn, int wait_plain, const char *fmt, ...) | |
257 | { | |
258 | va_list ap; | |
259 | char reason[128]; /* must always be under 250 bytes */ | |
260 | uint8_t buf[256]; | |
261 | int len; | |
262 | if(IsDead(conn)) | |
263 | return; | |
264 | ||
265 | rb_rawbuf_flush(conn->modbuf_out, conn->mod_fd); | |
266 | rb_rawbuf_flush(conn->plainbuf_out, conn->plain_fd); | |
267 | rb_close(conn->mod_fd); | |
268 | SetDead(conn); | |
269 | ||
270 | rb_dlinkDelete(&conn->node, connid_hash(conn->id)); | |
271 | ||
272 | if(!wait_plain || fmt == NULL) | |
273 | { | |
274 | rb_close(conn->plain_fd); | |
275 | rb_dlinkAdd(conn, &conn->node, &dead_list); | |
276 | return; | |
277 | } | |
278 | ||
279 | rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_shutdown_cb, conn); | |
280 | rb_setselect(conn->plain_fd, RB_SELECT_WRITE, NULL, NULL); | |
281 | ||
282 | va_start(ap, fmt); | |
283 | vsnprintf(reason, sizeof(reason), fmt, ap); | |
284 | va_end(ap); | |
285 | ||
286 | buf[0] = 'D'; | |
287 | uint32_to_buf(&buf[1], conn->id); | |
288 | rb_strlcpy((char *) &buf[5], reason, sizeof(buf) - 5); | |
289 | len = (strlen(reason) + 1) + 5; | |
290 | mod_cmd_write_queue(conn->ctl, buf, len); | |
291 | } | |
292 | ||
caebeeca AC |
293 | static conn_t * |
294 | make_conn(mod_ctl_t * ctl, rb_fde_t *mod_fd, rb_fde_t *plain_fd) | |
295 | { | |
296 | conn_t *conn = rb_malloc(sizeof(conn_t)); | |
297 | conn->ctl = ctl; | |
298 | conn->modbuf_out = rb_new_rawbuffer(); | |
299 | conn->plainbuf_out = rb_new_rawbuffer(); | |
300 | conn->mod_fd = mod_fd; | |
301 | conn->plain_fd = plain_fd; | |
302 | conn->id = -1; | |
caebeeca AC |
303 | rb_set_nb(mod_fd); |
304 | rb_set_nb(plain_fd); | |
305 | return conn; | |
306 | } | |
307 | ||
308 | static void | |
309 | cleanup_bad_message(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb) | |
310 | { | |
311 | int i; | |
312 | ||
313 | /* XXX should log this somehow */ | |
314 | for (i = 0; i < ctlb->nfds; i++) | |
315 | rb_close(ctlb->F[i]); | |
316 | } | |
317 | ||
318 | static void | |
05e0aa9a AC |
319 | conn_mod_handshake_cb(rb_fde_t *fd, void *data) |
320 | { | |
321 | char inbuf[READBUF_SIZE]; | |
322 | conn_t *conn = data; | |
323 | int length = 0; | |
324 | if (conn == NULL) | |
325 | return; | |
326 | ||
327 | if (IsDead(conn)) | |
328 | return; | |
329 | ||
330 | while (1) | |
331 | { | |
332 | if (IsDead(conn)) | |
333 | return; | |
334 | ||
335 | length = rb_read(conn->plain_fd, inbuf, sizeof(inbuf)); | |
336 | if (length == 0 || (length < 0 && !rb_ignore_errno(errno))) | |
337 | { | |
338 | close_conn(conn, NO_WAIT, "Connection closed"); | |
339 | return; | |
340 | } | |
341 | } | |
342 | } | |
343 | ||
344 | static void | |
345 | conn_mod_read_cb(rb_fde_t *fd, void *data) | |
346 | { | |
347 | } | |
348 | ||
349 | static void | |
350 | conn_plain_read_cb(rb_fde_t *fd, void *data) | |
351 | { | |
352 | } | |
353 | ||
354 | static void | |
355 | conn_plain_read_shutdown_cb(rb_fde_t *fd, void *data) | |
356 | { | |
357 | char inbuf[READBUF_SIZE]; | |
358 | conn_t *conn = data; | |
359 | int length = 0; | |
360 | ||
361 | if(conn == NULL) | |
362 | return; | |
363 | ||
364 | while(1) | |
365 | { | |
366 | length = rb_read(conn->plain_fd, inbuf, sizeof(inbuf)); | |
367 | ||
368 | if(length == 0 || (length < 0 && !rb_ignore_errno(errno))) | |
369 | { | |
370 | rb_close(conn->plain_fd); | |
371 | rb_dlinkAdd(conn, &conn->node, &dead_list); | |
372 | return; | |
373 | } | |
374 | ||
375 | if(length < 0) | |
376 | { | |
377 | rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_shutdown_cb, conn); | |
378 | return; | |
379 | } | |
380 | } | |
381 | } | |
382 | ||
383 | static void | |
384 | wsock_process(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb) | |
caebeeca AC |
385 | { |
386 | conn_t *conn; | |
387 | uint32_t id; | |
388 | ||
389 | conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]); | |
390 | ||
391 | id = buf_to_uint32(&ctlb->buf[1]); | |
392 | conn_add_id_hash(conn, id); | |
393 | SetWS(conn); | |
394 | ||
395 | if(rb_get_type(conn->mod_fd) & RB_FD_UNKNOWN) | |
396 | rb_set_type(conn->mod_fd, RB_FD_SOCKET); | |
397 | ||
398 | if(rb_get_type(conn->plain_fd) == RB_FD_UNKNOWN) | |
399 | rb_set_type(conn->plain_fd, RB_FD_SOCKET); | |
400 | ||
05e0aa9a | 401 | conn_mod_handshake_cb(conn->mod_fd, conn); |
caebeeca AC |
402 | } |
403 | ||
404 | static void | |
405 | mod_process_cmd_recv(mod_ctl_t * ctl) | |
406 | { | |
407 | rb_dlink_node *ptr, *next; | |
408 | mod_ctl_buf_t *ctl_buf; | |
409 | ||
410 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head) | |
411 | { | |
412 | ctl_buf = ptr->data; | |
413 | ||
414 | switch (*ctl_buf->buf) | |
415 | { | |
416 | case 'A': | |
417 | { | |
418 | if (ctl_buf->nfds != 2 || ctl_buf->buflen != 5) | |
419 | { | |
420 | cleanup_bad_message(ctl, ctl_buf); | |
421 | break; | |
422 | } | |
05e0aa9a | 423 | wsock_process(ctl, ctl_buf); |
caebeeca AC |
424 | break; |
425 | } | |
426 | default: | |
427 | break; | |
428 | /* Log unknown commands */ | |
429 | } | |
430 | rb_dlinkDelete(ptr, &ctl->readq); | |
431 | rb_free(ctl_buf->buf); | |
432 | rb_free(ctl_buf); | |
433 | } | |
434 | ||
435 | } | |
436 | ||
437 | static void | |
438 | mod_read_ctl(rb_fde_t *F, void *data) | |
439 | { | |
440 | mod_ctl_buf_t *ctl_buf; | |
441 | mod_ctl_t *ctl = data; | |
442 | int retlen; | |
443 | int i; | |
444 | ||
445 | do | |
446 | { | |
447 | ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t)); | |
448 | ctl_buf->buf = rb_malloc(READBUF_SIZE); | |
449 | ctl_buf->buflen = READBUF_SIZE; | |
450 | retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, ctl_buf->buflen, ctl_buf->F, | |
451 | MAXPASSFD); | |
452 | if(retlen <= 0) | |
453 | { | |
454 | rb_free(ctl_buf->buf); | |
455 | rb_free(ctl_buf); | |
456 | } | |
457 | else | |
458 | { | |
459 | ctl_buf->buflen = retlen; | |
460 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq); | |
461 | for (i = 0; i < MAXPASSFD && ctl_buf->F[i] != NULL; i++) | |
462 | ; | |
463 | ctl_buf->nfds = i; | |
464 | } | |
465 | } | |
466 | while(retlen > 0); | |
467 | ||
468 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
469 | exit(0); | |
470 | ||
471 | mod_process_cmd_recv(ctl); | |
472 | rb_setselect(ctl->F, RB_SELECT_READ, mod_read_ctl, ctl); | |
473 | } | |
474 | ||
caebeeca AC |
475 | static void |
476 | read_pipe_ctl(rb_fde_t *F, void *data) | |
477 | { | |
478 | char inbuf[READBUF_SIZE]; | |
479 | int retlen; | |
480 | while((retlen = rb_read(F, inbuf, sizeof(inbuf))) > 0) | |
481 | { | |
482 | ;; /* we don't do anything with the pipe really, just care if the other process dies.. */ | |
483 | } | |
484 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
485 | exit(0); | |
486 | rb_setselect(F, RB_SELECT_READ, read_pipe_ctl, NULL); | |
487 | } | |
488 | ||
489 | int | |
490 | main(int argc, char **argv) | |
491 | { | |
492 | const char *s_ctlfd, *s_pipe, *s_pid; | |
493 | int ctlfd, pipefd, x, maxfd; | |
494 | maxfd = maxconn(); | |
495 | ||
496 | s_ctlfd = getenv("CTL_FD"); | |
497 | s_pipe = getenv("CTL_PIPE"); | |
498 | s_pid = getenv("CTL_PPID"); | |
499 | ||
500 | if(s_ctlfd == NULL || s_pipe == NULL || s_pid == NULL) | |
501 | { | |
502 | fprintf(stderr, | |
503 | "This is the charybdis wsockd for internal ircd use.\n"); | |
504 | fprintf(stderr, | |
505 | "You aren't supposed to run me directly. Exiting.\n"); | |
506 | exit(1); | |
507 | } | |
508 | ||
509 | ctlfd = atoi(s_ctlfd); | |
510 | pipefd = atoi(s_pipe); | |
511 | ppid = atoi(s_pid); | |
512 | x = 0; | |
513 | #ifndef _WIN32 | |
514 | for(x = 0; x < maxfd; x++) | |
515 | { | |
516 | if(x != ctlfd && x != pipefd && x > 2) | |
517 | close(x); | |
518 | } | |
519 | x = open("/dev/null", O_RDWR); | |
520 | ||
521 | if(x >= 0) | |
522 | { | |
523 | if(ctlfd != 0 && pipefd != 0) | |
524 | dup2(x, 0); | |
525 | if(ctlfd != 1 && pipefd != 1) | |
526 | dup2(x, 1); | |
527 | if(ctlfd != 2 && pipefd != 2) | |
528 | dup2(x, 2); | |
529 | if(x > 2) | |
530 | close(x); | |
531 | } | |
532 | #endif | |
533 | setup_signals(); | |
534 | rb_lib_init(NULL, NULL, NULL, 0, maxfd, 1024, 4096); | |
535 | rb_init_rawbuffers(1024); | |
536 | ||
537 | mod_ctl = rb_malloc(sizeof(mod_ctl_t)); | |
538 | mod_ctl->F = rb_open(ctlfd, RB_FD_SOCKET, "ircd control socket"); | |
539 | mod_ctl->F_pipe = rb_open(pipefd, RB_FD_PIPE, "ircd pipe"); | |
540 | rb_set_nb(mod_ctl->F); | |
541 | rb_set_nb(mod_ctl->F_pipe); | |
542 | rb_event_addish("clean_dead_conns", clean_dead_conns, NULL, 10); | |
543 | read_pipe_ctl(mod_ctl->F_pipe, NULL); | |
544 | mod_read_ctl(mod_ctl->F, mod_ctl); | |
545 | ||
546 | rb_lib_loop(0); | |
547 | return 0; | |
548 | } |