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212380e3 | 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 | 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 | 46 | #define FD_HASH_SIZE 128 |
47 | static dlink_list fd_table[FD_HASH_SIZE]; | |
212380e3 | 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 | 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 | ||
86859074 | 88 | F = MyMalloc(sizeof(fde_t)); |
e70f8e92 | 89 | F->fd = fd; |
86859074 WP |
90 | |
91 | F->read_impl = read; | |
92 | F->write_impl = write; | |
93 | ||
e70f8e92 | 94 | list = &fd_table[fd % FD_HASH_SIZE]; |
95 | dlinkAdd(F, &F->node, list); | |
96 | ||
97 | return F; | |
98 | } | |
99 | ||
100 | inline void | |
101 | comm_remove_fd(int fd) | |
102 | { | |
103 | int bucket = fd % FD_HASH_SIZE; | |
104 | fde_t *F; | |
105 | dlink_list *list = &fd_table[bucket]; | |
106 | ||
107 | F = comm_locate_fd(fd); | |
108 | if (F == NULL) | |
109 | return; | |
110 | ||
111 | dlinkDelete(&F->node, list); | |
112 | MyFree(F); | |
113 | } | |
114 | ||
212380e3 | 115 | /* 32bit solaris is kinda slow and stdio only supports fds < 256 |
116 | * so we got to do this crap below. | |
117 | * (BTW Fuck you Sun, I hate your guts and I hope you go bankrupt soon) | |
e70f8e92 | 118 | * XXX: this is no longer needed in Solaris 10. --nenolod |
212380e3 | 119 | */ |
120 | #if defined (__SVR4) && defined (__sun) | |
121 | static void comm_fd_hack(int *fd) | |
122 | { | |
123 | int newfd; | |
124 | if(*fd > 256 || *fd < 0) | |
125 | return; | |
126 | if((newfd = fcntl(*fd, F_DUPFD, 256)) != -1) | |
127 | { | |
128 | close(*fd); | |
129 | *fd = newfd; | |
130 | } | |
131 | return; | |
132 | } | |
133 | #else | |
134 | #define comm_fd_hack(fd) | |
135 | #endif | |
136 | ||
137 | ||
138 | /* close_all_connections() can be used *before* the system come up! */ | |
139 | ||
140 | void | |
141 | comm_close_all(void) | |
142 | { | |
143 | int i; | |
144 | #ifndef NDEBUG | |
145 | int fd; | |
146 | #endif | |
147 | ||
6fcb8629 | 148 | /* |
149 | * we start at 4 to avoid giving fds where malloc messages | |
150 | * could be written --nenolod | |
151 | */ | |
152 | for (i = 4; i < comm_max_connections; ++i) | |
212380e3 | 153 | { |
e70f8e92 | 154 | fde_t *F = comm_locate_fd(i); |
155 | ||
156 | if(F != NULL && F->flags.open) | |
212380e3 | 157 | comm_close(i); |
158 | else | |
159 | close(i); | |
160 | } | |
161 | ||
162 | /* XXX should his hack be done in all cases? */ | |
163 | #ifndef NDEBUG | |
164 | /* fugly hack to reserve fd == 2 */ | |
165 | (void) close(2); | |
166 | fd = open("stderr.log", O_WRONLY | O_CREAT | O_APPEND, 0644); | |
167 | if(fd >= 0) | |
168 | { | |
169 | dup2(fd, 2); | |
170 | close(fd); | |
171 | } | |
172 | #endif | |
173 | } | |
174 | ||
175 | /* | |
176 | * get_sockerr - get the error value from the socket or the current errno | |
177 | * | |
178 | * Get the *real* error from the socket (well try to anyway..). | |
179 | * This may only work when SO_DEBUG is enabled but its worth the | |
180 | * gamble anyway. | |
181 | */ | |
182 | int | |
183 | comm_get_sockerr(int fd) | |
184 | { | |
185 | int errtmp = errno; | |
186 | #ifdef SO_ERROR | |
187 | int err = 0; | |
188 | socklen_t len = sizeof(err); | |
189 | ||
190 | if(-1 < fd && !getsockopt(fd, SOL_SOCKET, SO_ERROR, (char *) &err, (socklen_t *) & len)) | |
191 | { | |
192 | if(err) | |
193 | errtmp = err; | |
194 | } | |
195 | errno = errtmp; | |
196 | #endif | |
197 | return errtmp; | |
198 | } | |
199 | ||
200 | /* | |
201 | * set_sock_buffers - set send and receive buffers for socket | |
202 | * | |
203 | * inputs - fd file descriptor | |
204 | * - size to set | |
205 | * output - returns true (1) if successful, false (0) otherwise | |
206 | * side effects - | |
207 | */ | |
208 | int | |
209 | comm_set_buffers(int fd, int size) | |
210 | { | |
211 | if(setsockopt | |
212 | (fd, SOL_SOCKET, SO_RCVBUF, (char *) &size, sizeof(size)) | |
213 | || setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *) &size, sizeof(size))) | |
214 | return 0; | |
215 | return 1; | |
216 | } | |
217 | ||
218 | /* | |
219 | * set_non_blocking - Set the client connection into non-blocking mode. | |
220 | * | |
221 | * inputs - fd to set into non blocking mode | |
222 | * output - 1 if successful 0 if not | |
223 | * side effects - use POSIX compliant non blocking and | |
224 | * be done with it. | |
225 | */ | |
226 | int | |
227 | comm_set_nb(int fd) | |
228 | { | |
229 | int nonb = 0; | |
230 | int res; | |
e70f8e92 | 231 | fde_t *F = comm_locate_fd(fd); |
212380e3 | 232 | |
233 | nonb |= O_NONBLOCK; | |
234 | res = fcntl(fd, F_GETFL, 0); | |
235 | if(-1 == res || fcntl(fd, F_SETFL, res | nonb) == -1) | |
236 | return 0; | |
237 | ||
e70f8e92 | 238 | if (F != NULL) |
239 | F->flags.nonblocking = 1; | |
240 | ||
212380e3 | 241 | return 1; |
242 | } | |
243 | ||
244 | ||
245 | /* | |
246 | * stolen from squid - its a neat (but overused! :) routine which we | |
247 | * can use to see whether we can ignore this errno or not. It is | |
248 | * generally useful for non-blocking network IO related errnos. | |
249 | * -- adrian | |
250 | */ | |
251 | int | |
252 | ignoreErrno(int ierrno) | |
253 | { | |
254 | switch (ierrno) | |
255 | { | |
256 | case EINPROGRESS: | |
257 | case EWOULDBLOCK: | |
258 | #if EAGAIN != EWOULDBLOCK | |
259 | case EAGAIN: | |
260 | #endif | |
261 | case EALREADY: | |
262 | case EINTR: | |
263 | #ifdef ERESTART | |
264 | case ERESTART: | |
265 | #endif | |
266 | return 1; | |
267 | default: | |
268 | return 0; | |
269 | } | |
270 | } | |
271 | ||
272 | ||
273 | /* | |
274 | * comm_settimeout() - set the socket timeout | |
275 | * | |
276 | * Set the timeout for the fd | |
277 | */ | |
278 | void | |
279 | comm_settimeout(int fd, time_t timeout, PF * callback, void *cbdata) | |
280 | { | |
281 | fde_t *F; | |
282 | s_assert(fd >= 0); | |
e70f8e92 | 283 | F = comm_locate_fd(fd); |
212380e3 | 284 | s_assert(F->flags.open); |
285 | ||
286 | F->timeout = CurrentTime + (timeout / 1000); | |
287 | F->timeout_handler = callback; | |
288 | F->timeout_data = cbdata; | |
289 | } | |
290 | ||
291 | ||
292 | /* | |
293 | * comm_setflush() - set a flush function | |
294 | * | |
295 | * A flush function is simply a function called if found during | |
296 | * comm_timeouts(). Its basically a second timeout, except in this case | |
297 | * I'm too lazy to implement multiple timeout functions! :-) | |
298 | * its kinda nice to have it seperate, since this is designed for | |
299 | * flush functions, and when comm_close() is implemented correctly | |
300 | * with close functions, we _actually_ don't call comm_close() here .. | |
301 | */ | |
302 | void | |
303 | comm_setflush(int fd, time_t timeout, PF * callback, void *cbdata) | |
304 | { | |
305 | fde_t *F; | |
306 | s_assert(fd >= 0); | |
e70f8e92 | 307 | F = comm_locate_fd(fd); |
212380e3 | 308 | s_assert(F->flags.open); |
309 | ||
310 | F->flush_timeout = CurrentTime + (timeout / 1000); | |
311 | F->flush_handler = callback; | |
312 | F->flush_data = cbdata; | |
313 | } | |
314 | ||
315 | ||
316 | /* | |
317 | * comm_checktimeouts() - check the socket timeouts | |
318 | * | |
319 | * All this routine does is call the given callback/cbdata, without closing | |
320 | * down the file descriptor. When close handlers have been implemented, | |
321 | * this will happen. | |
322 | */ | |
323 | void | |
324 | comm_checktimeouts(void *notused) | |
325 | { | |
212380e3 | 326 | PF *hdl; |
327 | void *data; | |
328 | fde_t *F; | |
d0e1e8ee | 329 | dlink_list *bucket; |
330 | int i; | |
331 | dlink_node *n, *n2; | |
332 | ||
61e3b8f2 | 333 | for (i = 0; i <= FD_HASH_SIZE; i++) |
212380e3 | 334 | { |
d0e1e8ee | 335 | bucket = &fd_table[i]; |
212380e3 | 336 | |
d0e1e8ee | 337 | if (dlink_list_length(bucket) <= 0) |
338 | continue; | |
212380e3 | 339 | |
d0e1e8ee | 340 | DLINK_FOREACH_SAFE(n, n2, bucket->head) |
212380e3 | 341 | { |
d0e1e8ee | 342 | F = (fde_t *) n->data; |
343 | ||
344 | if(F == NULL) | |
345 | continue; | |
346 | if(!F->flags.open) | |
347 | continue; | |
348 | if(F->flags.closing) | |
349 | continue; | |
350 | ||
351 | /* check flush functions */ | |
352 | if(F->flush_handler && | |
353 | F->flush_timeout > 0 && F->flush_timeout < CurrentTime) | |
354 | { | |
355 | hdl = F->flush_handler; | |
356 | data = F->flush_data; | |
357 | comm_setflush(F->fd, 0, NULL, NULL); | |
358 | hdl(F->fd, data); | |
359 | } | |
360 | ||
361 | /* check timeouts */ | |
362 | if(F->timeout_handler && | |
363 | F->timeout > 0 && F->timeout < CurrentTime) | |
364 | { | |
365 | /* Call timeout handler */ | |
366 | hdl = F->timeout_handler; | |
367 | data = F->timeout_data; | |
368 | comm_settimeout(F->fd, 0, NULL, NULL); | |
369 | hdl(F->fd, data); | |
370 | } | |
212380e3 | 371 | } |
372 | } | |
373 | } | |
374 | ||
375 | /* | |
376 | * void comm_connect_tcp(int fd, const char *host, u_short port, | |
377 | * struct sockaddr *clocal, int socklen, | |
378 | * CNCB *callback, void *data, int aftype, int timeout) | |
379 | * Input: An fd to connect with, a host and port to connect to, | |
380 | * a local sockaddr to connect from + length(or NULL to use the | |
381 | * default), a callback, the data to pass into the callback, the | |
382 | * address family. | |
383 | * Output: None. | |
384 | * Side-effects: A non-blocking connection to the host is started, and | |
385 | * if necessary, set up for selection. The callback given | |
386 | * may be called now, or it may be called later. | |
387 | */ | |
388 | void | |
389 | comm_connect_tcp(int fd, const char *host, u_short port, | |
390 | struct sockaddr *clocal, int socklen, CNCB * callback, | |
391 | void *data, int aftype, int timeout) | |
392 | { | |
393 | void *ipptr = NULL; | |
394 | fde_t *F; | |
395 | s_assert(fd >= 0); | |
e70f8e92 | 396 | F = comm_locate_fd(fd); |
212380e3 | 397 | F->flags.called_connect = 1; |
398 | s_assert(callback); | |
399 | F->connect.callback = callback; | |
400 | F->connect.data = data; | |
401 | ||
402 | memset(&F->connect.hostaddr, 0, sizeof(F->connect.hostaddr)); | |
403 | #ifdef IPV6 | |
404 | if(aftype == AF_INET6) | |
405 | { | |
406 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&F->connect.hostaddr; | |
407 | SET_SS_LEN(F->connect.hostaddr, sizeof(struct sockaddr_in6)); | |
408 | in6->sin6_port = htons(port); | |
409 | in6->sin6_family = AF_INET6; | |
410 | ipptr = &in6->sin6_addr; | |
411 | } else | |
412 | #endif | |
413 | { | |
414 | struct sockaddr_in *in = (struct sockaddr_in *)&F->connect.hostaddr; | |
415 | SET_SS_LEN(F->connect.hostaddr, sizeof(struct sockaddr_in)); | |
416 | in->sin_port = htons(port); | |
417 | in->sin_family = AF_INET; | |
418 | ipptr = &in->sin_addr; | |
419 | } | |
420 | ||
421 | /* Note that we're using a passed sockaddr here. This is because | |
422 | * generally you'll be bind()ing to a sockaddr grabbed from | |
423 | * getsockname(), so this makes things easier. | |
424 | * XXX If NULL is passed as local, we should later on bind() to the | |
425 | * virtual host IP, for completeness. | |
426 | * -- adrian | |
427 | */ | |
428 | if((clocal != NULL) && (bind(F->fd, clocal, socklen) < 0)) | |
429 | { | |
430 | /* Failure, call the callback with COMM_ERR_BIND */ | |
431 | comm_connect_callback(F->fd, COMM_ERR_BIND); | |
432 | /* ... and quit */ | |
433 | return; | |
434 | } | |
435 | ||
436 | /* Next, if we have been given an IP, get the addr and skip the | |
437 | * DNS check (and head direct to comm_connect_tryconnect(). | |
438 | */ | |
439 | if(inetpton(aftype, host, ipptr) <= 0) | |
440 | { | |
441 | /* Send the DNS request, for the next level */ | |
442 | F->dns_query = MyMalloc(sizeof(struct DNSQuery)); | |
443 | F->dns_query->ptr = F; | |
444 | F->dns_query->callback = comm_connect_dns_callback; | |
445 | #ifdef IPV6 | |
446 | if (aftype == AF_INET6) | |
447 | gethost_byname_type(host, F->dns_query, T_AAAA); | |
448 | else | |
449 | #endif | |
450 | gethost_byname_type(host, F->dns_query, T_A); | |
451 | } | |
452 | else | |
453 | { | |
454 | /* We have a valid IP, so we just call tryconnect */ | |
455 | /* Make sure we actually set the timeout here .. */ | |
456 | comm_settimeout(F->fd, timeout * 1000, comm_connect_timeout, NULL); | |
457 | comm_connect_tryconnect(F->fd, NULL); | |
458 | } | |
459 | } | |
460 | ||
461 | /* | |
462 | * comm_connect_callback() - call the callback, and continue with life | |
463 | */ | |
464 | static void | |
465 | comm_connect_callback(int fd, int status) | |
466 | { | |
467 | CNCB *hdl; | |
e70f8e92 | 468 | fde_t *F = comm_locate_fd(fd); |
469 | ||
212380e3 | 470 | /* This check is gross..but probably necessary */ |
e70f8e92 | 471 | if(F == NULL || F->connect.callback == NULL) |
212380e3 | 472 | return; |
e70f8e92 | 473 | |
212380e3 | 474 | /* Clear the connect flag + handler */ |
475 | hdl = F->connect.callback; | |
476 | F->connect.callback = NULL; | |
477 | F->flags.called_connect = 0; | |
478 | ||
479 | /* Clear the timeout handler */ | |
480 | comm_settimeout(F->fd, 0, NULL, NULL); | |
481 | ||
482 | /* Call the handler */ | |
483 | hdl(F->fd, status, F->connect.data); | |
484 | } | |
485 | ||
486 | ||
487 | /* | |
488 | * comm_connect_timeout() - this gets called when the socket connection | |
489 | * times out. This *only* can be called once connect() is initially | |
490 | * called .. | |
491 | */ | |
492 | static void | |
493 | comm_connect_timeout(int fd, void *notused) | |
494 | { | |
495 | /* error! */ | |
496 | comm_connect_callback(fd, COMM_ERR_TIMEOUT); | |
497 | } | |
498 | ||
499 | ||
500 | /* | |
501 | * comm_connect_dns_callback() - called at the completion of the DNS request | |
502 | * | |
503 | * The DNS request has completed, so if we've got an error, return it, | |
504 | * otherwise we initiate the connect() | |
505 | */ | |
506 | static void | |
507 | comm_connect_dns_callback(void *vptr, struct DNSReply *reply) | |
508 | { | |
509 | fde_t *F = vptr; | |
510 | ||
511 | /* Free dns_query now to avoid double reslist free -- jilles */ | |
512 | MyFree(F->dns_query); | |
513 | F->dns_query = NULL; | |
514 | ||
515 | if(!reply) | |
516 | { | |
517 | comm_connect_callback(F->fd, COMM_ERR_DNS); | |
518 | return; | |
519 | } | |
520 | ||
521 | /* No error, set a 10 second timeout */ | |
522 | comm_settimeout(F->fd, 30 * 1000, comm_connect_timeout, NULL); | |
523 | ||
524 | /* Copy over the DNS reply info so we can use it in the connect() */ | |
525 | #ifdef IPV6 | |
526 | if(reply->addr.ss_family == AF_INET6) | |
527 | { | |
528 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&F->connect.hostaddr; | |
529 | memcpy(&in6->sin6_addr, &((struct sockaddr_in6 *)&reply->addr)->sin6_addr, sizeof(struct in6_addr)); | |
530 | } | |
531 | else | |
532 | #endif | |
533 | { | |
534 | struct sockaddr_in *in = (struct sockaddr_in *)&F->connect.hostaddr; | |
535 | in->sin_addr.s_addr = ((struct sockaddr_in *)&reply->addr)->sin_addr.s_addr; | |
536 | } | |
537 | ||
538 | /* Now, call the tryconnect() routine to try a connect() */ | |
539 | comm_connect_tryconnect(F->fd, NULL); | |
540 | } | |
541 | ||
542 | ||
543 | /* static void comm_connect_tryconnect(int fd, void *notused) | |
544 | * Input: The fd, the handler data(unused). | |
545 | * Output: None. | |
546 | * Side-effects: Try and connect with pending connect data for the FD. If | |
547 | * we succeed or get a fatal error, call the callback. | |
548 | * Otherwise, it is still blocking or something, so register | |
549 | * to select for a write event on this FD. | |
550 | */ | |
551 | static void | |
552 | comm_connect_tryconnect(int fd, void *notused) | |
553 | { | |
554 | int retval; | |
e70f8e92 | 555 | fde_t *F = comm_locate_fd(fd); |
212380e3 | 556 | |
557 | if(F->connect.callback == NULL) | |
558 | return; | |
559 | /* Try the connect() */ | |
e70f8e92 | 560 | retval = connect(fd, (struct sockaddr *) &F->connect.hostaddr, |
561 | GET_SS_LEN(F->connect.hostaddr)); | |
212380e3 | 562 | /* Error? */ |
563 | if(retval < 0) | |
564 | { | |
565 | /* | |
566 | * If we get EISCONN, then we've already connect()ed the socket, | |
567 | * which is a good thing. | |
568 | * -- adrian | |
569 | */ | |
570 | if(errno == EISCONN) | |
571 | comm_connect_callback(F->fd, COMM_OK); | |
572 | else if(ignoreErrno(errno)) | |
573 | /* Ignore error? Reschedule */ | |
574 | comm_setselect(F->fd, FDLIST_SERVER, COMM_SELECT_WRITE|COMM_SELECT_RETRY, | |
575 | comm_connect_tryconnect, NULL, 0); | |
576 | else | |
577 | /* Error? Fail with COMM_ERR_CONNECT */ | |
578 | comm_connect_callback(F->fd, COMM_ERR_CONNECT); | |
579 | return; | |
580 | } | |
581 | /* If we get here, we've suceeded, so call with COMM_OK */ | |
582 | comm_connect_callback(F->fd, COMM_OK); | |
583 | } | |
584 | ||
585 | /* | |
586 | * comm_error_str() - return an error string for the given error condition | |
587 | */ | |
588 | const char * | |
589 | comm_errstr(int error) | |
590 | { | |
591 | if(error < 0 || error >= COMM_ERR_MAX) | |
592 | return "Invalid error number!"; | |
593 | return comm_err_str[error]; | |
594 | } | |
595 | ||
596 | ||
597 | /* | |
598 | * comm_socket() - open a socket | |
599 | * | |
600 | * This is a highly highly cut down version of squid's comm_open() which | |
601 | * for the most part emulates socket(), *EXCEPT* it fails if we're about | |
602 | * to run out of file descriptors. | |
603 | */ | |
604 | int | |
605 | comm_socket(int family, int sock_type, int proto, const char *note) | |
606 | { | |
607 | int fd; | |
608 | /* First, make sure we aren't going to run out of file descriptors */ | |
6fcb8629 | 609 | if(number_fd >= comm_max_connections) |
212380e3 | 610 | { |
611 | errno = ENFILE; | |
612 | return -1; | |
613 | } | |
614 | ||
615 | /* | |
616 | * Next, we try to open the socket. We *should* drop the reserved FD | |
617 | * limit if/when we get an error, but we can deal with that later. | |
618 | * XXX !!! -- adrian | |
619 | */ | |
620 | fd = socket(family, sock_type, proto); | |
621 | comm_fd_hack(&fd); | |
622 | if(fd < 0) | |
623 | return -1; /* errno will be passed through, yay.. */ | |
624 | ||
625 | #if defined(IPV6) && defined(IPV6_V6ONLY) | |
626 | /* | |
627 | * Make sure we can take both IPv4 and IPv6 connections | |
628 | * on an AF_INET6 socket | |
629 | */ | |
630 | if(family == AF_INET6) | |
631 | { | |
632 | int off = 1; | |
633 | if(setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &off, sizeof(off)) == -1) | |
634 | { | |
635 | libcharybdis_log("comm_socket: Could not set IPV6_V6ONLY option to 1 on FD %d: %s", | |
636 | fd, strerror(errno)); | |
637 | close(fd); | |
638 | return -1; | |
639 | } | |
640 | } | |
641 | #endif | |
642 | ||
643 | /* Set the socket non-blocking, and other wonderful bits */ | |
644 | if(!comm_set_nb(fd)) | |
645 | { | |
646 | libcharybdis_log("comm_open: Couldn't set FD %d non blocking: %s", fd, strerror(errno)); | |
647 | close(fd); | |
648 | return -1; | |
649 | } | |
650 | ||
651 | /* Next, update things in our fd tracking */ | |
652 | comm_open(fd, FD_SOCKET, note); | |
653 | return fd; | |
654 | } | |
655 | ||
656 | ||
657 | /* | |
658 | * comm_accept() - accept an incoming connection | |
659 | * | |
660 | * This is a simple wrapper for accept() which enforces FD limits like | |
661 | * comm_open() does. | |
662 | */ | |
663 | int | |
664 | comm_accept(int fd, struct sockaddr *pn, socklen_t *addrlen) | |
665 | { | |
666 | int newfd; | |
6fcb8629 | 667 | if(number_fd >= comm_max_connections) |
212380e3 | 668 | { |
669 | errno = ENFILE; | |
670 | return -1; | |
671 | } | |
672 | ||
673 | /* | |
674 | * Next, do the accept(). if we get an error, we should drop the | |
675 | * reserved fd limit, but we can deal with that when comm_open() | |
676 | * also does it. XXX -- adrian | |
677 | */ | |
678 | newfd = accept(fd, (struct sockaddr *) pn, addrlen); | |
679 | comm_fd_hack(&newfd); | |
680 | ||
681 | if(newfd < 0) | |
682 | return -1; | |
683 | ||
684 | /* Set the socket non-blocking, and other wonderful bits */ | |
685 | if(!comm_set_nb(newfd)) | |
686 | { | |
687 | libcharybdis_log("comm_accept: Couldn't set FD %d non blocking!", newfd); | |
688 | close(newfd); | |
689 | return -1; | |
690 | } | |
691 | ||
692 | /* Next, tag the FD as an incoming connection */ | |
693 | comm_open(newfd, FD_SOCKET, "Incoming connection"); | |
694 | ||
695 | /* .. and return */ | |
696 | return newfd; | |
697 | } | |
698 | ||
699 | /* | |
700 | * If a sockaddr_storage is AF_INET6 but is a mapped IPv4 | |
701 | * socket manged the sockaddr. | |
702 | */ | |
703 | #ifndef mangle_mapped_sockaddr | |
704 | void | |
705 | mangle_mapped_sockaddr(struct sockaddr *in) | |
706 | { | |
707 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in; | |
708 | ||
709 | if(in->sa_family == AF_INET) | |
710 | return; | |
711 | ||
712 | if(in->sa_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&in6->sin6_addr)) | |
713 | { | |
714 | struct sockaddr_in in4; | |
715 | memset(&in4, 0, sizeof(struct sockaddr_in)); | |
716 | in4.sin_family = AF_INET; | |
717 | in4.sin_port = in6->sin6_port; | |
718 | in4.sin_addr.s_addr = ((uint32_t *)&in6->sin6_addr)[3]; | |
719 | memcpy(in, &in4, sizeof(struct sockaddr_in)); | |
720 | } | |
721 | return; | |
722 | } | |
723 | #endif | |
724 | ||
725 | ||
726 | static void | |
727 | fdlist_update_biggest(int fd, int opening) | |
728 | { | |
729 | if(fd < highest_fd) | |
730 | return; | |
6fcb8629 | 731 | s_assert(fd < comm_max_connections); |
212380e3 | 732 | |
733 | if(fd > highest_fd) | |
734 | { | |
735 | /* | |
736 | * s_assert that we are not closing a FD bigger than | |
737 | * our known biggest FD | |
738 | */ | |
739 | s_assert(opening); | |
740 | highest_fd = fd; | |
741 | return; | |
742 | } | |
743 | /* if we are here, then fd == Biggest_FD */ | |
744 | /* | |
745 | * s_assert that we are closing the biggest FD; we can't be | |
746 | * re-opening it | |
747 | */ | |
748 | s_assert(!opening); | |
a6a30f6f | 749 | while (highest_fd >= 0 && comm_locate_fd(fd) != NULL) |
212380e3 | 750 | highest_fd--; |
751 | } | |
752 | ||
753 | ||
754 | void | |
755 | fdlist_init(void) | |
756 | { | |
757 | static int initialized = 0; | |
6fcb8629 | 758 | struct rlimit limit; |
212380e3 | 759 | |
760 | if(!initialized) | |
761 | { | |
e70f8e92 | 762 | memset(&fd_table, '\0', sizeof(dlink_list) * FD_HASH_SIZE); |
6fcb8629 | 763 | |
764 | /* set up comm_max_connections. */ | |
765 | if(!getrlimit(RLIMIT_NOFILE, &limit)) | |
766 | comm_max_connections = limit.rlim_cur; | |
767 | ||
212380e3 | 768 | initialized = 1; |
769 | } | |
770 | } | |
771 | ||
772 | /* Called to open a given filedescriptor */ | |
773 | void | |
774 | comm_open(int fd, unsigned int type, const char *desc) | |
775 | { | |
e70f8e92 | 776 | fde_t *F = comm_add_fd(fd); |
212380e3 | 777 | s_assert(fd >= 0); |
778 | ||
779 | if(F->flags.open) | |
780 | { | |
781 | comm_close(fd); | |
782 | } | |
783 | s_assert(!F->flags.open); | |
784 | F->fd = fd; | |
785 | F->type = type; | |
786 | F->flags.open = 1; | |
787 | #ifdef NOTYET | |
788 | F->defer.until = 0; | |
789 | F->defer.n = 0; | |
790 | F->defer.handler = NULL; | |
791 | #endif | |
792 | fdlist_update_biggest(fd, 1); | |
793 | F->comm_index = -1; | |
794 | F->list = FDLIST_NONE; | |
795 | if(desc) | |
796 | strlcpy(F->desc, desc, sizeof(F->desc)); | |
797 | number_fd++; | |
798 | } | |
799 | ||
800 | ||
801 | /* Called to close a given filedescriptor */ | |
802 | void | |
803 | comm_close(int fd) | |
804 | { | |
e70f8e92 | 805 | fde_t *F = comm_locate_fd(fd); |
212380e3 | 806 | s_assert(F->flags.open); |
807 | /* All disk fd's MUST go through file_close() ! */ | |
808 | s_assert(F->type != FD_FILE); | |
809 | if(F->type == FD_FILE) | |
810 | { | |
811 | s_assert(F->read_handler == NULL); | |
812 | s_assert(F->write_handler == NULL); | |
813 | } | |
814 | comm_setselect(F->fd, FDLIST_NONE, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0); | |
815 | comm_setflush(F->fd, 0, NULL, NULL); | |
df98bc52 | 816 | F->timeout = 0; |
212380e3 | 817 | |
818 | if (F->dns_query != NULL) | |
819 | { | |
820 | delete_resolver_queries(F->dns_query); | |
821 | MyFree(F->dns_query); | |
822 | F->dns_query = NULL; | |
823 | } | |
824 | ||
825 | F->flags.open = 0; | |
826 | fdlist_update_biggest(fd, 0); | |
827 | number_fd--; | |
e70f8e92 | 828 | comm_remove_fd(fd); |
829 | ||
212380e3 | 830 | /* Unlike squid, we're actually closing the FD here! -- adrian */ |
831 | close(fd); | |
832 | } | |
833 | ||
212380e3 | 834 | /* |
835 | * comm_dump() - dump the list of active filedescriptors | |
836 | */ | |
837 | void | |
838 | comm_dump(struct Client *source_p) | |
839 | { | |
840 | int i; | |
841 | ||
e70f8e92 | 842 | for (i = 0; i <= FD_HASH_SIZE; i++) |
212380e3 | 843 | { |
e70f8e92 | 844 | dlink_node *n; |
845 | ||
846 | if (dlink_list_length(&fd_table[i]) <= 0) | |
212380e3 | 847 | continue; |
848 | ||
e70f8e92 | 849 | DLINK_FOREACH(n, fd_table[i].head) |
850 | { | |
851 | fde_t *F = (fde_t *) n->data; | |
852 | ||
853 | if(F == NULL || !F->flags.open) | |
854 | continue; | |
855 | ||
856 | sendto_one_numeric(source_p, RPL_STATSDEBUG, | |
857 | "F :fd %-3d bucket %-3d desc '%s'", | |
858 | F->fd, i, F->desc); | |
859 | } | |
212380e3 | 860 | } |
861 | } | |
862 | ||
863 | /* | |
864 | * comm_note() - set the fd note | |
865 | * | |
866 | * Note: must be careful not to overflow fd_table[fd].desc when | |
867 | * calling. | |
868 | */ | |
869 | void | |
870 | comm_note(int fd, const char *format, ...) | |
871 | { | |
872 | va_list args; | |
e70f8e92 | 873 | fde_t *F = comm_add_fd(fd); /* XXX: epoll, kqueue. */ |
212380e3 | 874 | |
875 | if(format) | |
876 | { | |
877 | va_start(args, format); | |
e70f8e92 | 878 | ircvsnprintf(F->desc, FD_DESC_SZ, format, args); |
212380e3 | 879 | va_end(args); |
880 | } | |
881 | else | |
e70f8e92 | 882 | F->desc[0] = '\0'; |
212380e3 | 883 | } |
884 | ||
6fcb8629 | 885 | extern int |
886 | comm_get_maxconnections(void) | |
887 | { | |
888 | fdlist_init(); | |
212380e3 | 889 | |
6fcb8629 | 890 | return comm_max_connections; |
891 | } |