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212380e3 AC |
1 | /* |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * commio.c: Network/file related functions | |
4 | * | |
5 | * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center | |
6 | * Copyright (C) 1996-2002 Hybrid Development Team | |
7 | * Copyright (C) 2002-2005 ircd-ratbox development team | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
22 | * USA | |
23 | * | |
6fcb8629 | 24 | * $Id: commio.c 3354 2007-04-03 09:21:31Z nenolod $ |
212380e3 AC |
25 | */ |
26 | ||
27 | #include "libcharybdis.h" | |
28 | ||
29 | #ifndef IN_LOOPBACKNET | |
30 | #define IN_LOOPBACKNET 0x7f | |
31 | #endif | |
32 | ||
33 | #ifndef INADDR_NONE | |
34 | #define INADDR_NONE ((unsigned int) 0xffffffff) | |
35 | #endif | |
36 | ||
37 | const char *const NONB_ERROR_MSG = "set_non_blocking failed for %s:%s"; | |
38 | const char *const SETBUF_ERROR_MSG = "set_sock_buffers failed for server %s:%s"; | |
39 | ||
40 | static const char *comm_err_str[] = { "Comm OK", "Error during bind()", | |
41 | "Error during DNS lookup", "connect timeout", | |
42 | "Error during connect()", | |
43 | "Comm Error" | |
44 | }; | |
45 | ||
e70f8e92 AC |
46 | #define FD_HASH_SIZE 128 |
47 | static dlink_list fd_table[FD_HASH_SIZE]; | |
212380e3 AC |
48 | |
49 | static void fdlist_update_biggest(int fd, int opening); | |
50 | ||
51 | /* Highest FD and number of open FDs .. */ | |
52 | int highest_fd = -1; /* Its -1 because we haven't started yet -- adrian */ | |
53 | int number_fd = 0; | |
54 | ||
55 | static void comm_connect_callback(int fd, int status); | |
56 | static PF comm_connect_timeout; | |
57 | static void comm_connect_dns_callback(void *vptr, struct DNSReply *reply); | |
58 | static PF comm_connect_tryconnect; | |
6fcb8629 | 59 | static int comm_max_connections = 0; |
212380e3 | 60 | |
e70f8e92 AC |
61 | inline fde_t * |
62 | comm_locate_fd(int fd) | |
63 | { | |
64 | int bucket = fd % FD_HASH_SIZE; | |
65 | dlink_list *list = &fd_table[bucket]; | |
66 | dlink_node *n; | |
67 | ||
68 | DLINK_FOREACH(n, list->head) | |
69 | { | |
70 | fde_t *F = (fde_t *) n->data; | |
71 | ||
72 | if (F->fd == fd) | |
73 | return F; | |
74 | } | |
75 | ||
76 | return NULL; | |
77 | } | |
78 | ||
79 | inline fde_t * | |
80 | comm_add_fd(int fd) | |
81 | { | |
82 | fde_t *F = comm_locate_fd(fd); | |
83 | dlink_list *list; | |
84 | ||
85 | if (F != NULL) | |
86 | return F; | |
87 | ||
88 | F = calloc(sizeof(fde_t), 1); | |
89 | F->fd = fd; | |
90 | list = &fd_table[fd % FD_HASH_SIZE]; | |
91 | dlinkAdd(F, &F->node, list); | |
92 | ||
93 | return F; | |
94 | } | |
95 | ||
96 | inline void | |
97 | comm_remove_fd(int fd) | |
98 | { | |
99 | int bucket = fd % FD_HASH_SIZE; | |
100 | fde_t *F; | |
101 | dlink_list *list = &fd_table[bucket]; | |
102 | ||
103 | F = comm_locate_fd(fd); | |
104 | if (F == NULL) | |
105 | return; | |
106 | ||
107 | dlinkDelete(&F->node, list); | |
108 | MyFree(F); | |
109 | } | |
110 | ||
212380e3 AC |
111 | /* 32bit solaris is kinda slow and stdio only supports fds < 256 |
112 | * so we got to do this crap below. | |
113 | * (BTW Fuck you Sun, I hate your guts and I hope you go bankrupt soon) | |
e70f8e92 | 114 | * XXX: this is no longer needed in Solaris 10. --nenolod |
212380e3 AC |
115 | */ |
116 | #if defined (__SVR4) && defined (__sun) | |
117 | static void comm_fd_hack(int *fd) | |
118 | { | |
119 | int newfd; | |
120 | if(*fd > 256 || *fd < 0) | |
121 | return; | |
122 | if((newfd = fcntl(*fd, F_DUPFD, 256)) != -1) | |
123 | { | |
124 | close(*fd); | |
125 | *fd = newfd; | |
126 | } | |
127 | return; | |
128 | } | |
129 | #else | |
130 | #define comm_fd_hack(fd) | |
131 | #endif | |
132 | ||
133 | ||
134 | /* close_all_connections() can be used *before* the system come up! */ | |
135 | ||
136 | void | |
137 | comm_close_all(void) | |
138 | { | |
139 | int i; | |
140 | #ifndef NDEBUG | |
141 | int fd; | |
142 | #endif | |
143 | ||
6fcb8629 AC |
144 | /* |
145 | * we start at 4 to avoid giving fds where malloc messages | |
146 | * could be written --nenolod | |
147 | */ | |
148 | for (i = 4; i < comm_max_connections; ++i) | |
212380e3 | 149 | { |
e70f8e92 AC |
150 | fde_t *F = comm_locate_fd(i); |
151 | ||
152 | if(F != NULL && F->flags.open) | |
212380e3 AC |
153 | comm_close(i); |
154 | else | |
155 | close(i); | |
156 | } | |
157 | ||
158 | /* XXX should his hack be done in all cases? */ | |
159 | #ifndef NDEBUG | |
160 | /* fugly hack to reserve fd == 2 */ | |
161 | (void) close(2); | |
162 | fd = open("stderr.log", O_WRONLY | O_CREAT | O_APPEND, 0644); | |
163 | if(fd >= 0) | |
164 | { | |
165 | dup2(fd, 2); | |
166 | close(fd); | |
167 | } | |
168 | #endif | |
169 | } | |
170 | ||
171 | /* | |
172 | * get_sockerr - get the error value from the socket or the current errno | |
173 | * | |
174 | * Get the *real* error from the socket (well try to anyway..). | |
175 | * This may only work when SO_DEBUG is enabled but its worth the | |
176 | * gamble anyway. | |
177 | */ | |
178 | int | |
179 | comm_get_sockerr(int fd) | |
180 | { | |
181 | int errtmp = errno; | |
182 | #ifdef SO_ERROR | |
183 | int err = 0; | |
184 | socklen_t len = sizeof(err); | |
185 | ||
186 | if(-1 < fd && !getsockopt(fd, SOL_SOCKET, SO_ERROR, (char *) &err, (socklen_t *) & len)) | |
187 | { | |
188 | if(err) | |
189 | errtmp = err; | |
190 | } | |
191 | errno = errtmp; | |
192 | #endif | |
193 | return errtmp; | |
194 | } | |
195 | ||
196 | /* | |
197 | * set_sock_buffers - set send and receive buffers for socket | |
198 | * | |
199 | * inputs - fd file descriptor | |
200 | * - size to set | |
201 | * output - returns true (1) if successful, false (0) otherwise | |
202 | * side effects - | |
203 | */ | |
204 | int | |
205 | comm_set_buffers(int fd, int size) | |
206 | { | |
207 | if(setsockopt | |
208 | (fd, SOL_SOCKET, SO_RCVBUF, (char *) &size, sizeof(size)) | |
209 | || setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *) &size, sizeof(size))) | |
210 | return 0; | |
211 | return 1; | |
212 | } | |
213 | ||
214 | /* | |
215 | * set_non_blocking - Set the client connection into non-blocking mode. | |
216 | * | |
217 | * inputs - fd to set into non blocking mode | |
218 | * output - 1 if successful 0 if not | |
219 | * side effects - use POSIX compliant non blocking and | |
220 | * be done with it. | |
221 | */ | |
222 | int | |
223 | comm_set_nb(int fd) | |
224 | { | |
225 | int nonb = 0; | |
226 | int res; | |
e70f8e92 | 227 | fde_t *F = comm_locate_fd(fd); |
212380e3 AC |
228 | |
229 | nonb |= O_NONBLOCK; | |
230 | res = fcntl(fd, F_GETFL, 0); | |
231 | if(-1 == res || fcntl(fd, F_SETFL, res | nonb) == -1) | |
232 | return 0; | |
233 | ||
e70f8e92 AC |
234 | if (F != NULL) |
235 | F->flags.nonblocking = 1; | |
236 | ||
212380e3 AC |
237 | return 1; |
238 | } | |
239 | ||
240 | ||
241 | /* | |
242 | * stolen from squid - its a neat (but overused! :) routine which we | |
243 | * can use to see whether we can ignore this errno or not. It is | |
244 | * generally useful for non-blocking network IO related errnos. | |
245 | * -- adrian | |
246 | */ | |
247 | int | |
248 | ignoreErrno(int ierrno) | |
249 | { | |
250 | switch (ierrno) | |
251 | { | |
252 | case EINPROGRESS: | |
253 | case EWOULDBLOCK: | |
254 | #if EAGAIN != EWOULDBLOCK | |
255 | case EAGAIN: | |
256 | #endif | |
257 | case EALREADY: | |
258 | case EINTR: | |
259 | #ifdef ERESTART | |
260 | case ERESTART: | |
261 | #endif | |
262 | return 1; | |
263 | default: | |
264 | return 0; | |
265 | } | |
266 | } | |
267 | ||
268 | ||
269 | /* | |
270 | * comm_settimeout() - set the socket timeout | |
271 | * | |
272 | * Set the timeout for the fd | |
273 | */ | |
274 | void | |
275 | comm_settimeout(int fd, time_t timeout, PF * callback, void *cbdata) | |
276 | { | |
277 | fde_t *F; | |
278 | s_assert(fd >= 0); | |
e70f8e92 | 279 | F = comm_locate_fd(fd); |
212380e3 AC |
280 | s_assert(F->flags.open); |
281 | ||
282 | F->timeout = CurrentTime + (timeout / 1000); | |
283 | F->timeout_handler = callback; | |
284 | F->timeout_data = cbdata; | |
285 | } | |
286 | ||
287 | ||
288 | /* | |
289 | * comm_setflush() - set a flush function | |
290 | * | |
291 | * A flush function is simply a function called if found during | |
292 | * comm_timeouts(). Its basically a second timeout, except in this case | |
293 | * I'm too lazy to implement multiple timeout functions! :-) | |
294 | * its kinda nice to have it seperate, since this is designed for | |
295 | * flush functions, and when comm_close() is implemented correctly | |
296 | * with close functions, we _actually_ don't call comm_close() here .. | |
297 | */ | |
298 | void | |
299 | comm_setflush(int fd, time_t timeout, PF * callback, void *cbdata) | |
300 | { | |
301 | fde_t *F; | |
302 | s_assert(fd >= 0); | |
e70f8e92 | 303 | F = comm_locate_fd(fd); |
212380e3 AC |
304 | s_assert(F->flags.open); |
305 | ||
306 | F->flush_timeout = CurrentTime + (timeout / 1000); | |
307 | F->flush_handler = callback; | |
308 | F->flush_data = cbdata; | |
309 | } | |
310 | ||
311 | ||
312 | /* | |
313 | * comm_checktimeouts() - check the socket timeouts | |
314 | * | |
315 | * All this routine does is call the given callback/cbdata, without closing | |
316 | * down the file descriptor. When close handlers have been implemented, | |
317 | * this will happen. | |
318 | */ | |
319 | void | |
320 | comm_checktimeouts(void *notused) | |
321 | { | |
212380e3 AC |
322 | PF *hdl; |
323 | void *data; | |
324 | fde_t *F; | |
d0e1e8ee AC |
325 | dlink_list *bucket; |
326 | int i; | |
327 | dlink_node *n, *n2; | |
328 | ||
61e3b8f2 | 329 | for (i = 0; i <= FD_HASH_SIZE; i++) |
212380e3 | 330 | { |
d0e1e8ee | 331 | bucket = &fd_table[i]; |
212380e3 | 332 | |
d0e1e8ee AC |
333 | if (dlink_list_length(bucket) <= 0) |
334 | continue; | |
212380e3 | 335 | |
d0e1e8ee | 336 | DLINK_FOREACH_SAFE(n, n2, bucket->head) |
212380e3 | 337 | { |
d0e1e8ee AC |
338 | F = (fde_t *) n->data; |
339 | ||
340 | if(F == NULL) | |
341 | continue; | |
342 | if(!F->flags.open) | |
343 | continue; | |
344 | if(F->flags.closing) | |
345 | continue; | |
346 | ||
347 | /* check flush functions */ | |
348 | if(F->flush_handler && | |
349 | F->flush_timeout > 0 && F->flush_timeout < CurrentTime) | |
350 | { | |
351 | hdl = F->flush_handler; | |
352 | data = F->flush_data; | |
353 | comm_setflush(F->fd, 0, NULL, NULL); | |
354 | hdl(F->fd, data); | |
355 | } | |
356 | ||
357 | /* check timeouts */ | |
358 | if(F->timeout_handler && | |
359 | F->timeout > 0 && F->timeout < CurrentTime) | |
360 | { | |
361 | /* Call timeout handler */ | |
362 | hdl = F->timeout_handler; | |
363 | data = F->timeout_data; | |
364 | comm_settimeout(F->fd, 0, NULL, NULL); | |
365 | hdl(F->fd, data); | |
366 | } | |
212380e3 AC |
367 | } |
368 | } | |
369 | } | |
370 | ||
371 | /* | |
372 | * void comm_connect_tcp(int fd, const char *host, u_short port, | |
373 | * struct sockaddr *clocal, int socklen, | |
374 | * CNCB *callback, void *data, int aftype, int timeout) | |
375 | * Input: An fd to connect with, a host and port to connect to, | |
376 | * a local sockaddr to connect from + length(or NULL to use the | |
377 | * default), a callback, the data to pass into the callback, the | |
378 | * address family. | |
379 | * Output: None. | |
380 | * Side-effects: A non-blocking connection to the host is started, and | |
381 | * if necessary, set up for selection. The callback given | |
382 | * may be called now, or it may be called later. | |
383 | */ | |
384 | void | |
385 | comm_connect_tcp(int fd, const char *host, u_short port, | |
386 | struct sockaddr *clocal, int socklen, CNCB * callback, | |
387 | void *data, int aftype, int timeout) | |
388 | { | |
389 | void *ipptr = NULL; | |
390 | fde_t *F; | |
391 | s_assert(fd >= 0); | |
e70f8e92 | 392 | F = comm_locate_fd(fd); |
212380e3 AC |
393 | F->flags.called_connect = 1; |
394 | s_assert(callback); | |
395 | F->connect.callback = callback; | |
396 | F->connect.data = data; | |
397 | ||
398 | memset(&F->connect.hostaddr, 0, sizeof(F->connect.hostaddr)); | |
399 | #ifdef IPV6 | |
400 | if(aftype == AF_INET6) | |
401 | { | |
402 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&F->connect.hostaddr; | |
403 | SET_SS_LEN(F->connect.hostaddr, sizeof(struct sockaddr_in6)); | |
404 | in6->sin6_port = htons(port); | |
405 | in6->sin6_family = AF_INET6; | |
406 | ipptr = &in6->sin6_addr; | |
407 | } else | |
408 | #endif | |
409 | { | |
410 | struct sockaddr_in *in = (struct sockaddr_in *)&F->connect.hostaddr; | |
411 | SET_SS_LEN(F->connect.hostaddr, sizeof(struct sockaddr_in)); | |
412 | in->sin_port = htons(port); | |
413 | in->sin_family = AF_INET; | |
414 | ipptr = &in->sin_addr; | |
415 | } | |
416 | ||
417 | /* Note that we're using a passed sockaddr here. This is because | |
418 | * generally you'll be bind()ing to a sockaddr grabbed from | |
419 | * getsockname(), so this makes things easier. | |
420 | * XXX If NULL is passed as local, we should later on bind() to the | |
421 | * virtual host IP, for completeness. | |
422 | * -- adrian | |
423 | */ | |
424 | if((clocal != NULL) && (bind(F->fd, clocal, socklen) < 0)) | |
425 | { | |
426 | /* Failure, call the callback with COMM_ERR_BIND */ | |
427 | comm_connect_callback(F->fd, COMM_ERR_BIND); | |
428 | /* ... and quit */ | |
429 | return; | |
430 | } | |
431 | ||
432 | /* Next, if we have been given an IP, get the addr and skip the | |
433 | * DNS check (and head direct to comm_connect_tryconnect(). | |
434 | */ | |
435 | if(inetpton(aftype, host, ipptr) <= 0) | |
436 | { | |
437 | /* Send the DNS request, for the next level */ | |
438 | F->dns_query = MyMalloc(sizeof(struct DNSQuery)); | |
439 | F->dns_query->ptr = F; | |
440 | F->dns_query->callback = comm_connect_dns_callback; | |
441 | #ifdef IPV6 | |
442 | if (aftype == AF_INET6) | |
443 | gethost_byname_type(host, F->dns_query, T_AAAA); | |
444 | else | |
445 | #endif | |
446 | gethost_byname_type(host, F->dns_query, T_A); | |
447 | } | |
448 | else | |
449 | { | |
450 | /* We have a valid IP, so we just call tryconnect */ | |
451 | /* Make sure we actually set the timeout here .. */ | |
452 | comm_settimeout(F->fd, timeout * 1000, comm_connect_timeout, NULL); | |
453 | comm_connect_tryconnect(F->fd, NULL); | |
454 | } | |
455 | } | |
456 | ||
457 | /* | |
458 | * comm_connect_callback() - call the callback, and continue with life | |
459 | */ | |
460 | static void | |
461 | comm_connect_callback(int fd, int status) | |
462 | { | |
463 | CNCB *hdl; | |
e70f8e92 AC |
464 | fde_t *F = comm_locate_fd(fd); |
465 | ||
212380e3 | 466 | /* This check is gross..but probably necessary */ |
e70f8e92 | 467 | if(F == NULL || F->connect.callback == NULL) |
212380e3 | 468 | return; |
e70f8e92 | 469 | |
212380e3 AC |
470 | /* Clear the connect flag + handler */ |
471 | hdl = F->connect.callback; | |
472 | F->connect.callback = NULL; | |
473 | F->flags.called_connect = 0; | |
474 | ||
475 | /* Clear the timeout handler */ | |
476 | comm_settimeout(F->fd, 0, NULL, NULL); | |
477 | ||
478 | /* Call the handler */ | |
479 | hdl(F->fd, status, F->connect.data); | |
480 | } | |
481 | ||
482 | ||
483 | /* | |
484 | * comm_connect_timeout() - this gets called when the socket connection | |
485 | * times out. This *only* can be called once connect() is initially | |
486 | * called .. | |
487 | */ | |
488 | static void | |
489 | comm_connect_timeout(int fd, void *notused) | |
490 | { | |
491 | /* error! */ | |
492 | comm_connect_callback(fd, COMM_ERR_TIMEOUT); | |
493 | } | |
494 | ||
495 | ||
496 | /* | |
497 | * comm_connect_dns_callback() - called at the completion of the DNS request | |
498 | * | |
499 | * The DNS request has completed, so if we've got an error, return it, | |
500 | * otherwise we initiate the connect() | |
501 | */ | |
502 | static void | |
503 | comm_connect_dns_callback(void *vptr, struct DNSReply *reply) | |
504 | { | |
505 | fde_t *F = vptr; | |
506 | ||
507 | /* Free dns_query now to avoid double reslist free -- jilles */ | |
508 | MyFree(F->dns_query); | |
509 | F->dns_query = NULL; | |
510 | ||
511 | if(!reply) | |
512 | { | |
513 | comm_connect_callback(F->fd, COMM_ERR_DNS); | |
514 | return; | |
515 | } | |
516 | ||
517 | /* No error, set a 10 second timeout */ | |
518 | comm_settimeout(F->fd, 30 * 1000, comm_connect_timeout, NULL); | |
519 | ||
520 | /* Copy over the DNS reply info so we can use it in the connect() */ | |
521 | #ifdef IPV6 | |
522 | if(reply->addr.ss_family == AF_INET6) | |
523 | { | |
524 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&F->connect.hostaddr; | |
525 | memcpy(&in6->sin6_addr, &((struct sockaddr_in6 *)&reply->addr)->sin6_addr, sizeof(struct in6_addr)); | |
526 | } | |
527 | else | |
528 | #endif | |
529 | { | |
530 | struct sockaddr_in *in = (struct sockaddr_in *)&F->connect.hostaddr; | |
531 | in->sin_addr.s_addr = ((struct sockaddr_in *)&reply->addr)->sin_addr.s_addr; | |
532 | } | |
533 | ||
534 | /* Now, call the tryconnect() routine to try a connect() */ | |
535 | comm_connect_tryconnect(F->fd, NULL); | |
536 | } | |
537 | ||
538 | ||
539 | /* static void comm_connect_tryconnect(int fd, void *notused) | |
540 | * Input: The fd, the handler data(unused). | |
541 | * Output: None. | |
542 | * Side-effects: Try and connect with pending connect data for the FD. If | |
543 | * we succeed or get a fatal error, call the callback. | |
544 | * Otherwise, it is still blocking or something, so register | |
545 | * to select for a write event on this FD. | |
546 | */ | |
547 | static void | |
548 | comm_connect_tryconnect(int fd, void *notused) | |
549 | { | |
550 | int retval; | |
e70f8e92 | 551 | fde_t *F = comm_locate_fd(fd); |
212380e3 AC |
552 | |
553 | if(F->connect.callback == NULL) | |
554 | return; | |
555 | /* Try the connect() */ | |
e70f8e92 AC |
556 | retval = connect(fd, (struct sockaddr *) &F->connect.hostaddr, |
557 | GET_SS_LEN(F->connect.hostaddr)); | |
212380e3 AC |
558 | /* Error? */ |
559 | if(retval < 0) | |
560 | { | |
561 | /* | |
562 | * If we get EISCONN, then we've already connect()ed the socket, | |
563 | * which is a good thing. | |
564 | * -- adrian | |
565 | */ | |
566 | if(errno == EISCONN) | |
567 | comm_connect_callback(F->fd, COMM_OK); | |
568 | else if(ignoreErrno(errno)) | |
569 | /* Ignore error? Reschedule */ | |
570 | comm_setselect(F->fd, FDLIST_SERVER, COMM_SELECT_WRITE|COMM_SELECT_RETRY, | |
571 | comm_connect_tryconnect, NULL, 0); | |
572 | else | |
573 | /* Error? Fail with COMM_ERR_CONNECT */ | |
574 | comm_connect_callback(F->fd, COMM_ERR_CONNECT); | |
575 | return; | |
576 | } | |
577 | /* If we get here, we've suceeded, so call with COMM_OK */ | |
578 | comm_connect_callback(F->fd, COMM_OK); | |
579 | } | |
580 | ||
581 | /* | |
582 | * comm_error_str() - return an error string for the given error condition | |
583 | */ | |
584 | const char * | |
585 | comm_errstr(int error) | |
586 | { | |
587 | if(error < 0 || error >= COMM_ERR_MAX) | |
588 | return "Invalid error number!"; | |
589 | return comm_err_str[error]; | |
590 | } | |
591 | ||
592 | ||
593 | /* | |
594 | * comm_socket() - open a socket | |
595 | * | |
596 | * This is a highly highly cut down version of squid's comm_open() which | |
597 | * for the most part emulates socket(), *EXCEPT* it fails if we're about | |
598 | * to run out of file descriptors. | |
599 | */ | |
600 | int | |
601 | comm_socket(int family, int sock_type, int proto, const char *note) | |
602 | { | |
603 | int fd; | |
604 | /* First, make sure we aren't going to run out of file descriptors */ | |
6fcb8629 | 605 | if(number_fd >= comm_max_connections) |
212380e3 AC |
606 | { |
607 | errno = ENFILE; | |
608 | return -1; | |
609 | } | |
610 | ||
611 | /* | |
612 | * Next, we try to open the socket. We *should* drop the reserved FD | |
613 | * limit if/when we get an error, but we can deal with that later. | |
614 | * XXX !!! -- adrian | |
615 | */ | |
616 | fd = socket(family, sock_type, proto); | |
617 | comm_fd_hack(&fd); | |
618 | if(fd < 0) | |
619 | return -1; /* errno will be passed through, yay.. */ | |
620 | ||
621 | #if defined(IPV6) && defined(IPV6_V6ONLY) | |
622 | /* | |
623 | * Make sure we can take both IPv4 and IPv6 connections | |
624 | * on an AF_INET6 socket | |
625 | */ | |
626 | if(family == AF_INET6) | |
627 | { | |
628 | int off = 1; | |
629 | if(setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &off, sizeof(off)) == -1) | |
630 | { | |
631 | libcharybdis_log("comm_socket: Could not set IPV6_V6ONLY option to 1 on FD %d: %s", | |
632 | fd, strerror(errno)); | |
633 | close(fd); | |
634 | return -1; | |
635 | } | |
636 | } | |
637 | #endif | |
638 | ||
639 | /* Set the socket non-blocking, and other wonderful bits */ | |
640 | if(!comm_set_nb(fd)) | |
641 | { | |
642 | libcharybdis_log("comm_open: Couldn't set FD %d non blocking: %s", fd, strerror(errno)); | |
643 | close(fd); | |
644 | return -1; | |
645 | } | |
646 | ||
647 | /* Next, update things in our fd tracking */ | |
648 | comm_open(fd, FD_SOCKET, note); | |
649 | return fd; | |
650 | } | |
651 | ||
652 | ||
653 | /* | |
654 | * comm_accept() - accept an incoming connection | |
655 | * | |
656 | * This is a simple wrapper for accept() which enforces FD limits like | |
657 | * comm_open() does. | |
658 | */ | |
659 | int | |
660 | comm_accept(int fd, struct sockaddr *pn, socklen_t *addrlen) | |
661 | { | |
662 | int newfd; | |
6fcb8629 | 663 | if(number_fd >= comm_max_connections) |
212380e3 AC |
664 | { |
665 | errno = ENFILE; | |
666 | return -1; | |
667 | } | |
668 | ||
669 | /* | |
670 | * Next, do the accept(). if we get an error, we should drop the | |
671 | * reserved fd limit, but we can deal with that when comm_open() | |
672 | * also does it. XXX -- adrian | |
673 | */ | |
674 | newfd = accept(fd, (struct sockaddr *) pn, addrlen); | |
675 | comm_fd_hack(&newfd); | |
676 | ||
677 | if(newfd < 0) | |
678 | return -1; | |
679 | ||
680 | /* Set the socket non-blocking, and other wonderful bits */ | |
681 | if(!comm_set_nb(newfd)) | |
682 | { | |
683 | libcharybdis_log("comm_accept: Couldn't set FD %d non blocking!", newfd); | |
684 | close(newfd); | |
685 | return -1; | |
686 | } | |
687 | ||
688 | /* Next, tag the FD as an incoming connection */ | |
689 | comm_open(newfd, FD_SOCKET, "Incoming connection"); | |
690 | ||
691 | /* .. and return */ | |
692 | return newfd; | |
693 | } | |
694 | ||
695 | /* | |
696 | * If a sockaddr_storage is AF_INET6 but is a mapped IPv4 | |
697 | * socket manged the sockaddr. | |
698 | */ | |
699 | #ifndef mangle_mapped_sockaddr | |
700 | void | |
701 | mangle_mapped_sockaddr(struct sockaddr *in) | |
702 | { | |
703 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in; | |
704 | ||
705 | if(in->sa_family == AF_INET) | |
706 | return; | |
707 | ||
708 | if(in->sa_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&in6->sin6_addr)) | |
709 | { | |
710 | struct sockaddr_in in4; | |
711 | memset(&in4, 0, sizeof(struct sockaddr_in)); | |
712 | in4.sin_family = AF_INET; | |
713 | in4.sin_port = in6->sin6_port; | |
714 | in4.sin_addr.s_addr = ((uint32_t *)&in6->sin6_addr)[3]; | |
715 | memcpy(in, &in4, sizeof(struct sockaddr_in)); | |
716 | } | |
717 | return; | |
718 | } | |
719 | #endif | |
720 | ||
721 | ||
722 | static void | |
723 | fdlist_update_biggest(int fd, int opening) | |
724 | { | |
725 | if(fd < highest_fd) | |
726 | return; | |
6fcb8629 | 727 | s_assert(fd < comm_max_connections); |
212380e3 AC |
728 | |
729 | if(fd > highest_fd) | |
730 | { | |
731 | /* | |
732 | * s_assert that we are not closing a FD bigger than | |
733 | * our known biggest FD | |
734 | */ | |
735 | s_assert(opening); | |
736 | highest_fd = fd; | |
737 | return; | |
738 | } | |
739 | /* if we are here, then fd == Biggest_FD */ | |
740 | /* | |
741 | * s_assert that we are closing the biggest FD; we can't be | |
742 | * re-opening it | |
743 | */ | |
744 | s_assert(!opening); | |
a6a30f6f | 745 | while (highest_fd >= 0 && comm_locate_fd(fd) != NULL) |
212380e3 AC |
746 | highest_fd--; |
747 | } | |
748 | ||
749 | ||
750 | void | |
751 | fdlist_init(void) | |
752 | { | |
753 | static int initialized = 0; | |
6fcb8629 | 754 | struct rlimit limit; |
212380e3 AC |
755 | |
756 | if(!initialized) | |
757 | { | |
e70f8e92 | 758 | memset(&fd_table, '\0', sizeof(dlink_list) * FD_HASH_SIZE); |
6fcb8629 AC |
759 | |
760 | /* set up comm_max_connections. */ | |
761 | if(!getrlimit(RLIMIT_NOFILE, &limit)) | |
762 | comm_max_connections = limit.rlim_cur; | |
763 | ||
212380e3 AC |
764 | initialized = 1; |
765 | } | |
766 | } | |
767 | ||
768 | /* Called to open a given filedescriptor */ | |
769 | void | |
770 | comm_open(int fd, unsigned int type, const char *desc) | |
771 | { | |
e70f8e92 | 772 | fde_t *F = comm_add_fd(fd); |
212380e3 AC |
773 | s_assert(fd >= 0); |
774 | ||
775 | if(F->flags.open) | |
776 | { | |
777 | comm_close(fd); | |
778 | } | |
779 | s_assert(!F->flags.open); | |
780 | F->fd = fd; | |
781 | F->type = type; | |
782 | F->flags.open = 1; | |
783 | #ifdef NOTYET | |
784 | F->defer.until = 0; | |
785 | F->defer.n = 0; | |
786 | F->defer.handler = NULL; | |
787 | #endif | |
788 | fdlist_update_biggest(fd, 1); | |
789 | F->comm_index = -1; | |
790 | F->list = FDLIST_NONE; | |
791 | if(desc) | |
792 | strlcpy(F->desc, desc, sizeof(F->desc)); | |
793 | number_fd++; | |
794 | } | |
795 | ||
796 | ||
797 | /* Called to close a given filedescriptor */ | |
798 | void | |
799 | comm_close(int fd) | |
800 | { | |
e70f8e92 | 801 | fde_t *F = comm_locate_fd(fd); |
212380e3 AC |
802 | s_assert(F->flags.open); |
803 | /* All disk fd's MUST go through file_close() ! */ | |
804 | s_assert(F->type != FD_FILE); | |
805 | if(F->type == FD_FILE) | |
806 | { | |
807 | s_assert(F->read_handler == NULL); | |
808 | s_assert(F->write_handler == NULL); | |
809 | } | |
810 | comm_setselect(F->fd, FDLIST_NONE, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0); | |
811 | comm_setflush(F->fd, 0, NULL, NULL); | |
df98bc52 | 812 | F->timeout = 0; |
212380e3 AC |
813 | |
814 | if (F->dns_query != NULL) | |
815 | { | |
816 | delete_resolver_queries(F->dns_query); | |
817 | MyFree(F->dns_query); | |
818 | F->dns_query = NULL; | |
819 | } | |
820 | ||
821 | F->flags.open = 0; | |
822 | fdlist_update_biggest(fd, 0); | |
823 | number_fd--; | |
e70f8e92 AC |
824 | comm_remove_fd(fd); |
825 | ||
212380e3 AC |
826 | /* Unlike squid, we're actually closing the FD here! -- adrian */ |
827 | close(fd); | |
828 | } | |
829 | ||
212380e3 AC |
830 | /* |
831 | * comm_dump() - dump the list of active filedescriptors | |
832 | */ | |
833 | void | |
834 | comm_dump(struct Client *source_p) | |
835 | { | |
836 | int i; | |
837 | ||
e70f8e92 | 838 | for (i = 0; i <= FD_HASH_SIZE; i++) |
212380e3 | 839 | { |
e70f8e92 AC |
840 | dlink_node *n; |
841 | ||
842 | if (dlink_list_length(&fd_table[i]) <= 0) | |
212380e3 AC |
843 | continue; |
844 | ||
e70f8e92 AC |
845 | DLINK_FOREACH(n, fd_table[i].head) |
846 | { | |
847 | fde_t *F = (fde_t *) n->data; | |
848 | ||
849 | if(F == NULL || !F->flags.open) | |
850 | continue; | |
851 | ||
852 | sendto_one_numeric(source_p, RPL_STATSDEBUG, | |
853 | "F :fd %-3d bucket %-3d desc '%s'", | |
854 | F->fd, i, F->desc); | |
855 | } | |
212380e3 AC |
856 | } |
857 | } | |
858 | ||
859 | /* | |
860 | * comm_note() - set the fd note | |
861 | * | |
862 | * Note: must be careful not to overflow fd_table[fd].desc when | |
863 | * calling. | |
864 | */ | |
865 | void | |
866 | comm_note(int fd, const char *format, ...) | |
867 | { | |
868 | va_list args; | |
e70f8e92 | 869 | fde_t *F = comm_add_fd(fd); /* XXX: epoll, kqueue. */ |
212380e3 AC |
870 | |
871 | if(format) | |
872 | { | |
873 | va_start(args, format); | |
e70f8e92 | 874 | ircvsnprintf(F->desc, FD_DESC_SZ, format, args); |
212380e3 AC |
875 | va_end(args); |
876 | } | |
877 | else | |
e70f8e92 | 878 | F->desc[0] = '\0'; |
212380e3 AC |
879 | } |
880 | ||
6fcb8629 AC |
881 | extern int |
882 | comm_get_maxconnections(void) | |
883 | { | |
884 | fdlist_init(); | |
212380e3 | 885 | |
6fcb8629 AC |
886 | return comm_max_connections; |
887 | } |