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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 | * | |
df98bc52 | 24 | * $Id: commio.c 3239 2007-03-05 17:41:40Z jilles $ |
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; | |
59 | ||
e70f8e92 | 60 | inline fde_t * |
61 | comm_locate_fd(int fd) | |
62 | { | |
63 | int bucket = fd % FD_HASH_SIZE; | |
64 | dlink_list *list = &fd_table[bucket]; | |
65 | dlink_node *n; | |
66 | ||
67 | DLINK_FOREACH(n, list->head) | |
68 | { | |
69 | fde_t *F = (fde_t *) n->data; | |
70 | ||
71 | if (F->fd == fd) | |
72 | return F; | |
73 | } | |
74 | ||
75 | return NULL; | |
76 | } | |
77 | ||
78 | inline fde_t * | |
79 | comm_add_fd(int fd) | |
80 | { | |
81 | fde_t *F = comm_locate_fd(fd); | |
82 | dlink_list *list; | |
83 | ||
84 | if (F != NULL) | |
85 | return F; | |
86 | ||
87 | F = calloc(sizeof(fde_t), 1); | |
88 | F->fd = fd; | |
89 | list = &fd_table[fd % FD_HASH_SIZE]; | |
90 | dlinkAdd(F, &F->node, list); | |
91 | ||
92 | return F; | |
93 | } | |
94 | ||
95 | inline void | |
96 | comm_remove_fd(int fd) | |
97 | { | |
98 | int bucket = fd % FD_HASH_SIZE; | |
99 | fde_t *F; | |
100 | dlink_list *list = &fd_table[bucket]; | |
101 | ||
102 | F = comm_locate_fd(fd); | |
103 | if (F == NULL) | |
104 | return; | |
105 | ||
106 | dlinkDelete(&F->node, list); | |
107 | MyFree(F); | |
108 | } | |
109 | ||
212380e3 | 110 | /* 32bit solaris is kinda slow and stdio only supports fds < 256 |
111 | * so we got to do this crap below. | |
112 | * (BTW Fuck you Sun, I hate your guts and I hope you go bankrupt soon) | |
e70f8e92 | 113 | * XXX: this is no longer needed in Solaris 10. --nenolod |
212380e3 | 114 | */ |
115 | #if defined (__SVR4) && defined (__sun) | |
116 | static void comm_fd_hack(int *fd) | |
117 | { | |
118 | int newfd; | |
119 | if(*fd > 256 || *fd < 0) | |
120 | return; | |
121 | if((newfd = fcntl(*fd, F_DUPFD, 256)) != -1) | |
122 | { | |
123 | close(*fd); | |
124 | *fd = newfd; | |
125 | } | |
126 | return; | |
127 | } | |
128 | #else | |
129 | #define comm_fd_hack(fd) | |
130 | #endif | |
131 | ||
132 | ||
133 | /* close_all_connections() can be used *before* the system come up! */ | |
134 | ||
135 | void | |
136 | comm_close_all(void) | |
137 | { | |
138 | int i; | |
139 | #ifndef NDEBUG | |
140 | int fd; | |
141 | #endif | |
142 | ||
143 | /* XXX someone tell me why we care about 4 fd's ? */ | |
144 | /* XXX btw, fd 3 is used for profiler ! */ | |
145 | ||
146 | for (i = 4; i < MAXCONNECTIONS; ++i) | |
147 | { | |
e70f8e92 | 148 | fde_t *F = comm_locate_fd(i); |
149 | ||
150 | if(F != NULL && F->flags.open) | |
212380e3 | 151 | comm_close(i); |
152 | else | |
153 | close(i); | |
154 | } | |
155 | ||
156 | /* XXX should his hack be done in all cases? */ | |
157 | #ifndef NDEBUG | |
158 | /* fugly hack to reserve fd == 2 */ | |
159 | (void) close(2); | |
160 | fd = open("stderr.log", O_WRONLY | O_CREAT | O_APPEND, 0644); | |
161 | if(fd >= 0) | |
162 | { | |
163 | dup2(fd, 2); | |
164 | close(fd); | |
165 | } | |
166 | #endif | |
167 | } | |
168 | ||
169 | /* | |
170 | * get_sockerr - get the error value from the socket or the current errno | |
171 | * | |
172 | * Get the *real* error from the socket (well try to anyway..). | |
173 | * This may only work when SO_DEBUG is enabled but its worth the | |
174 | * gamble anyway. | |
175 | */ | |
176 | int | |
177 | comm_get_sockerr(int fd) | |
178 | { | |
179 | int errtmp = errno; | |
180 | #ifdef SO_ERROR | |
181 | int err = 0; | |
182 | socklen_t len = sizeof(err); | |
183 | ||
184 | if(-1 < fd && !getsockopt(fd, SOL_SOCKET, SO_ERROR, (char *) &err, (socklen_t *) & len)) | |
185 | { | |
186 | if(err) | |
187 | errtmp = err; | |
188 | } | |
189 | errno = errtmp; | |
190 | #endif | |
191 | return errtmp; | |
192 | } | |
193 | ||
194 | /* | |
195 | * set_sock_buffers - set send and receive buffers for socket | |
196 | * | |
197 | * inputs - fd file descriptor | |
198 | * - size to set | |
199 | * output - returns true (1) if successful, false (0) otherwise | |
200 | * side effects - | |
201 | */ | |
202 | int | |
203 | comm_set_buffers(int fd, int size) | |
204 | { | |
205 | if(setsockopt | |
206 | (fd, SOL_SOCKET, SO_RCVBUF, (char *) &size, sizeof(size)) | |
207 | || setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *) &size, sizeof(size))) | |
208 | return 0; | |
209 | return 1; | |
210 | } | |
211 | ||
212 | /* | |
213 | * set_non_blocking - Set the client connection into non-blocking mode. | |
214 | * | |
215 | * inputs - fd to set into non blocking mode | |
216 | * output - 1 if successful 0 if not | |
217 | * side effects - use POSIX compliant non blocking and | |
218 | * be done with it. | |
219 | */ | |
220 | int | |
221 | comm_set_nb(int fd) | |
222 | { | |
223 | int nonb = 0; | |
224 | int res; | |
e70f8e92 | 225 | fde_t *F = comm_locate_fd(fd); |
212380e3 | 226 | |
227 | nonb |= O_NONBLOCK; | |
228 | res = fcntl(fd, F_GETFL, 0); | |
229 | if(-1 == res || fcntl(fd, F_SETFL, res | nonb) == -1) | |
230 | return 0; | |
231 | ||
e70f8e92 | 232 | if (F != NULL) |
233 | F->flags.nonblocking = 1; | |
234 | ||
212380e3 | 235 | return 1; |
236 | } | |
237 | ||
238 | ||
239 | /* | |
240 | * stolen from squid - its a neat (but overused! :) routine which we | |
241 | * can use to see whether we can ignore this errno or not. It is | |
242 | * generally useful for non-blocking network IO related errnos. | |
243 | * -- adrian | |
244 | */ | |
245 | int | |
246 | ignoreErrno(int ierrno) | |
247 | { | |
248 | switch (ierrno) | |
249 | { | |
250 | case EINPROGRESS: | |
251 | case EWOULDBLOCK: | |
252 | #if EAGAIN != EWOULDBLOCK | |
253 | case EAGAIN: | |
254 | #endif | |
255 | case EALREADY: | |
256 | case EINTR: | |
257 | #ifdef ERESTART | |
258 | case ERESTART: | |
259 | #endif | |
260 | return 1; | |
261 | default: | |
262 | return 0; | |
263 | } | |
264 | } | |
265 | ||
266 | ||
267 | /* | |
268 | * comm_settimeout() - set the socket timeout | |
269 | * | |
270 | * Set the timeout for the fd | |
271 | */ | |
272 | void | |
273 | comm_settimeout(int fd, time_t timeout, PF * callback, void *cbdata) | |
274 | { | |
275 | fde_t *F; | |
276 | s_assert(fd >= 0); | |
e70f8e92 | 277 | F = comm_locate_fd(fd); |
212380e3 | 278 | s_assert(F->flags.open); |
279 | ||
280 | F->timeout = CurrentTime + (timeout / 1000); | |
281 | F->timeout_handler = callback; | |
282 | F->timeout_data = cbdata; | |
283 | } | |
284 | ||
285 | ||
286 | /* | |
287 | * comm_setflush() - set a flush function | |
288 | * | |
289 | * A flush function is simply a function called if found during | |
290 | * comm_timeouts(). Its basically a second timeout, except in this case | |
291 | * I'm too lazy to implement multiple timeout functions! :-) | |
292 | * its kinda nice to have it seperate, since this is designed for | |
293 | * flush functions, and when comm_close() is implemented correctly | |
294 | * with close functions, we _actually_ don't call comm_close() here .. | |
295 | */ | |
296 | void | |
297 | comm_setflush(int fd, time_t timeout, PF * callback, void *cbdata) | |
298 | { | |
299 | fde_t *F; | |
300 | s_assert(fd >= 0); | |
e70f8e92 | 301 | F = comm_locate_fd(fd); |
212380e3 | 302 | s_assert(F->flags.open); |
303 | ||
304 | F->flush_timeout = CurrentTime + (timeout / 1000); | |
305 | F->flush_handler = callback; | |
306 | F->flush_data = cbdata; | |
307 | } | |
308 | ||
309 | ||
310 | /* | |
311 | * comm_checktimeouts() - check the socket timeouts | |
312 | * | |
313 | * All this routine does is call the given callback/cbdata, without closing | |
314 | * down the file descriptor. When close handlers have been implemented, | |
315 | * this will happen. | |
316 | */ | |
317 | void | |
318 | comm_checktimeouts(void *notused) | |
319 | { | |
212380e3 | 320 | PF *hdl; |
321 | void *data; | |
322 | fde_t *F; | |
d0e1e8ee | 323 | dlink_list *bucket; |
324 | int i; | |
325 | dlink_node *n, *n2; | |
326 | ||
61e3b8f2 | 327 | for (i = 0; i <= FD_HASH_SIZE; i++) |
212380e3 | 328 | { |
d0e1e8ee | 329 | bucket = &fd_table[i]; |
212380e3 | 330 | |
d0e1e8ee | 331 | if (dlink_list_length(bucket) <= 0) |
332 | continue; | |
212380e3 | 333 | |
d0e1e8ee | 334 | DLINK_FOREACH_SAFE(n, n2, bucket->head) |
212380e3 | 335 | { |
d0e1e8ee | 336 | F = (fde_t *) n->data; |
337 | ||
338 | if(F == NULL) | |
339 | continue; | |
340 | if(!F->flags.open) | |
341 | continue; | |
342 | if(F->flags.closing) | |
343 | continue; | |
344 | ||
345 | /* check flush functions */ | |
346 | if(F->flush_handler && | |
347 | F->flush_timeout > 0 && F->flush_timeout < CurrentTime) | |
348 | { | |
349 | hdl = F->flush_handler; | |
350 | data = F->flush_data; | |
351 | comm_setflush(F->fd, 0, NULL, NULL); | |
352 | hdl(F->fd, data); | |
353 | } | |
354 | ||
355 | /* check timeouts */ | |
356 | if(F->timeout_handler && | |
357 | F->timeout > 0 && F->timeout < CurrentTime) | |
358 | { | |
359 | /* Call timeout handler */ | |
360 | hdl = F->timeout_handler; | |
361 | data = F->timeout_data; | |
362 | comm_settimeout(F->fd, 0, NULL, NULL); | |
363 | hdl(F->fd, data); | |
364 | } | |
212380e3 | 365 | } |
366 | } | |
367 | } | |
368 | ||
369 | /* | |
370 | * void comm_connect_tcp(int fd, const char *host, u_short port, | |
371 | * struct sockaddr *clocal, int socklen, | |
372 | * CNCB *callback, void *data, int aftype, int timeout) | |
373 | * Input: An fd to connect with, a host and port to connect to, | |
374 | * a local sockaddr to connect from + length(or NULL to use the | |
375 | * default), a callback, the data to pass into the callback, the | |
376 | * address family. | |
377 | * Output: None. | |
378 | * Side-effects: A non-blocking connection to the host is started, and | |
379 | * if necessary, set up for selection. The callback given | |
380 | * may be called now, or it may be called later. | |
381 | */ | |
382 | void | |
383 | comm_connect_tcp(int fd, const char *host, u_short port, | |
384 | struct sockaddr *clocal, int socklen, CNCB * callback, | |
385 | void *data, int aftype, int timeout) | |
386 | { | |
387 | void *ipptr = NULL; | |
388 | fde_t *F; | |
389 | s_assert(fd >= 0); | |
e70f8e92 | 390 | F = comm_locate_fd(fd); |
212380e3 | 391 | F->flags.called_connect = 1; |
392 | s_assert(callback); | |
393 | F->connect.callback = callback; | |
394 | F->connect.data = data; | |
395 | ||
396 | memset(&F->connect.hostaddr, 0, sizeof(F->connect.hostaddr)); | |
397 | #ifdef IPV6 | |
398 | if(aftype == AF_INET6) | |
399 | { | |
400 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&F->connect.hostaddr; | |
401 | SET_SS_LEN(F->connect.hostaddr, sizeof(struct sockaddr_in6)); | |
402 | in6->sin6_port = htons(port); | |
403 | in6->sin6_family = AF_INET6; | |
404 | ipptr = &in6->sin6_addr; | |
405 | } else | |
406 | #endif | |
407 | { | |
408 | struct sockaddr_in *in = (struct sockaddr_in *)&F->connect.hostaddr; | |
409 | SET_SS_LEN(F->connect.hostaddr, sizeof(struct sockaddr_in)); | |
410 | in->sin_port = htons(port); | |
411 | in->sin_family = AF_INET; | |
412 | ipptr = &in->sin_addr; | |
413 | } | |
414 | ||
415 | /* Note that we're using a passed sockaddr here. This is because | |
416 | * generally you'll be bind()ing to a sockaddr grabbed from | |
417 | * getsockname(), so this makes things easier. | |
418 | * XXX If NULL is passed as local, we should later on bind() to the | |
419 | * virtual host IP, for completeness. | |
420 | * -- adrian | |
421 | */ | |
422 | if((clocal != NULL) && (bind(F->fd, clocal, socklen) < 0)) | |
423 | { | |
424 | /* Failure, call the callback with COMM_ERR_BIND */ | |
425 | comm_connect_callback(F->fd, COMM_ERR_BIND); | |
426 | /* ... and quit */ | |
427 | return; | |
428 | } | |
429 | ||
430 | /* Next, if we have been given an IP, get the addr and skip the | |
431 | * DNS check (and head direct to comm_connect_tryconnect(). | |
432 | */ | |
433 | if(inetpton(aftype, host, ipptr) <= 0) | |
434 | { | |
435 | /* Send the DNS request, for the next level */ | |
436 | F->dns_query = MyMalloc(sizeof(struct DNSQuery)); | |
437 | F->dns_query->ptr = F; | |
438 | F->dns_query->callback = comm_connect_dns_callback; | |
439 | #ifdef IPV6 | |
440 | if (aftype == AF_INET6) | |
441 | gethost_byname_type(host, F->dns_query, T_AAAA); | |
442 | else | |
443 | #endif | |
444 | gethost_byname_type(host, F->dns_query, T_A); | |
445 | } | |
446 | else | |
447 | { | |
448 | /* We have a valid IP, so we just call tryconnect */ | |
449 | /* Make sure we actually set the timeout here .. */ | |
450 | comm_settimeout(F->fd, timeout * 1000, comm_connect_timeout, NULL); | |
451 | comm_connect_tryconnect(F->fd, NULL); | |
452 | } | |
453 | } | |
454 | ||
455 | /* | |
456 | * comm_connect_callback() - call the callback, and continue with life | |
457 | */ | |
458 | static void | |
459 | comm_connect_callback(int fd, int status) | |
460 | { | |
461 | CNCB *hdl; | |
e70f8e92 | 462 | fde_t *F = comm_locate_fd(fd); |
463 | ||
212380e3 | 464 | /* This check is gross..but probably necessary */ |
e70f8e92 | 465 | if(F == NULL || F->connect.callback == NULL) |
212380e3 | 466 | return; |
e70f8e92 | 467 | |
212380e3 | 468 | /* Clear the connect flag + handler */ |
469 | hdl = F->connect.callback; | |
470 | F->connect.callback = NULL; | |
471 | F->flags.called_connect = 0; | |
472 | ||
473 | /* Clear the timeout handler */ | |
474 | comm_settimeout(F->fd, 0, NULL, NULL); | |
475 | ||
476 | /* Call the handler */ | |
477 | hdl(F->fd, status, F->connect.data); | |
478 | } | |
479 | ||
480 | ||
481 | /* | |
482 | * comm_connect_timeout() - this gets called when the socket connection | |
483 | * times out. This *only* can be called once connect() is initially | |
484 | * called .. | |
485 | */ | |
486 | static void | |
487 | comm_connect_timeout(int fd, void *notused) | |
488 | { | |
489 | /* error! */ | |
490 | comm_connect_callback(fd, COMM_ERR_TIMEOUT); | |
491 | } | |
492 | ||
493 | ||
494 | /* | |
495 | * comm_connect_dns_callback() - called at the completion of the DNS request | |
496 | * | |
497 | * The DNS request has completed, so if we've got an error, return it, | |
498 | * otherwise we initiate the connect() | |
499 | */ | |
500 | static void | |
501 | comm_connect_dns_callback(void *vptr, struct DNSReply *reply) | |
502 | { | |
503 | fde_t *F = vptr; | |
504 | ||
505 | /* Free dns_query now to avoid double reslist free -- jilles */ | |
506 | MyFree(F->dns_query); | |
507 | F->dns_query = NULL; | |
508 | ||
509 | if(!reply) | |
510 | { | |
511 | comm_connect_callback(F->fd, COMM_ERR_DNS); | |
512 | return; | |
513 | } | |
514 | ||
515 | /* No error, set a 10 second timeout */ | |
516 | comm_settimeout(F->fd, 30 * 1000, comm_connect_timeout, NULL); | |
517 | ||
518 | /* Copy over the DNS reply info so we can use it in the connect() */ | |
519 | #ifdef IPV6 | |
520 | if(reply->addr.ss_family == AF_INET6) | |
521 | { | |
522 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&F->connect.hostaddr; | |
523 | memcpy(&in6->sin6_addr, &((struct sockaddr_in6 *)&reply->addr)->sin6_addr, sizeof(struct in6_addr)); | |
524 | } | |
525 | else | |
526 | #endif | |
527 | { | |
528 | struct sockaddr_in *in = (struct sockaddr_in *)&F->connect.hostaddr; | |
529 | in->sin_addr.s_addr = ((struct sockaddr_in *)&reply->addr)->sin_addr.s_addr; | |
530 | } | |
531 | ||
532 | /* Now, call the tryconnect() routine to try a connect() */ | |
533 | comm_connect_tryconnect(F->fd, NULL); | |
534 | } | |
535 | ||
536 | ||
537 | /* static void comm_connect_tryconnect(int fd, void *notused) | |
538 | * Input: The fd, the handler data(unused). | |
539 | * Output: None. | |
540 | * Side-effects: Try and connect with pending connect data for the FD. If | |
541 | * we succeed or get a fatal error, call the callback. | |
542 | * Otherwise, it is still blocking or something, so register | |
543 | * to select for a write event on this FD. | |
544 | */ | |
545 | static void | |
546 | comm_connect_tryconnect(int fd, void *notused) | |
547 | { | |
548 | int retval; | |
e70f8e92 | 549 | fde_t *F = comm_locate_fd(fd); |
212380e3 | 550 | |
551 | if(F->connect.callback == NULL) | |
552 | return; | |
553 | /* Try the connect() */ | |
e70f8e92 | 554 | retval = connect(fd, (struct sockaddr *) &F->connect.hostaddr, |
555 | GET_SS_LEN(F->connect.hostaddr)); | |
212380e3 | 556 | /* Error? */ |
557 | if(retval < 0) | |
558 | { | |
559 | /* | |
560 | * If we get EISCONN, then we've already connect()ed the socket, | |
561 | * which is a good thing. | |
562 | * -- adrian | |
563 | */ | |
564 | if(errno == EISCONN) | |
565 | comm_connect_callback(F->fd, COMM_OK); | |
566 | else if(ignoreErrno(errno)) | |
567 | /* Ignore error? Reschedule */ | |
568 | comm_setselect(F->fd, FDLIST_SERVER, COMM_SELECT_WRITE|COMM_SELECT_RETRY, | |
569 | comm_connect_tryconnect, NULL, 0); | |
570 | else | |
571 | /* Error? Fail with COMM_ERR_CONNECT */ | |
572 | comm_connect_callback(F->fd, COMM_ERR_CONNECT); | |
573 | return; | |
574 | } | |
575 | /* If we get here, we've suceeded, so call with COMM_OK */ | |
576 | comm_connect_callback(F->fd, COMM_OK); | |
577 | } | |
578 | ||
579 | /* | |
580 | * comm_error_str() - return an error string for the given error condition | |
581 | */ | |
582 | const char * | |
583 | comm_errstr(int error) | |
584 | { | |
585 | if(error < 0 || error >= COMM_ERR_MAX) | |
586 | return "Invalid error number!"; | |
587 | return comm_err_str[error]; | |
588 | } | |
589 | ||
590 | ||
591 | /* | |
592 | * comm_socket() - open a socket | |
593 | * | |
594 | * This is a highly highly cut down version of squid's comm_open() which | |
595 | * for the most part emulates socket(), *EXCEPT* it fails if we're about | |
596 | * to run out of file descriptors. | |
597 | */ | |
598 | int | |
599 | comm_socket(int family, int sock_type, int proto, const char *note) | |
600 | { | |
601 | int fd; | |
602 | /* First, make sure we aren't going to run out of file descriptors */ | |
603 | if(number_fd >= MASTER_MAX) | |
604 | { | |
605 | errno = ENFILE; | |
606 | return -1; | |
607 | } | |
608 | ||
609 | /* | |
610 | * Next, we try to open the socket. We *should* drop the reserved FD | |
611 | * limit if/when we get an error, but we can deal with that later. | |
612 | * XXX !!! -- adrian | |
613 | */ | |
614 | fd = socket(family, sock_type, proto); | |
615 | comm_fd_hack(&fd); | |
616 | if(fd < 0) | |
617 | return -1; /* errno will be passed through, yay.. */ | |
618 | ||
619 | #if defined(IPV6) && defined(IPV6_V6ONLY) | |
620 | /* | |
621 | * Make sure we can take both IPv4 and IPv6 connections | |
622 | * on an AF_INET6 socket | |
623 | */ | |
624 | if(family == AF_INET6) | |
625 | { | |
626 | int off = 1; | |
627 | if(setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &off, sizeof(off)) == -1) | |
628 | { | |
629 | libcharybdis_log("comm_socket: Could not set IPV6_V6ONLY option to 1 on FD %d: %s", | |
630 | fd, strerror(errno)); | |
631 | close(fd); | |
632 | return -1; | |
633 | } | |
634 | } | |
635 | #endif | |
636 | ||
637 | /* Set the socket non-blocking, and other wonderful bits */ | |
638 | if(!comm_set_nb(fd)) | |
639 | { | |
640 | libcharybdis_log("comm_open: Couldn't set FD %d non blocking: %s", fd, strerror(errno)); | |
641 | close(fd); | |
642 | return -1; | |
643 | } | |
644 | ||
645 | /* Next, update things in our fd tracking */ | |
646 | comm_open(fd, FD_SOCKET, note); | |
647 | return fd; | |
648 | } | |
649 | ||
650 | ||
651 | /* | |
652 | * comm_accept() - accept an incoming connection | |
653 | * | |
654 | * This is a simple wrapper for accept() which enforces FD limits like | |
655 | * comm_open() does. | |
656 | */ | |
657 | int | |
658 | comm_accept(int fd, struct sockaddr *pn, socklen_t *addrlen) | |
659 | { | |
660 | int newfd; | |
661 | if(number_fd >= MASTER_MAX) | |
662 | { | |
663 | errno = ENFILE; | |
664 | return -1; | |
665 | } | |
666 | ||
667 | /* | |
668 | * Next, do the accept(). if we get an error, we should drop the | |
669 | * reserved fd limit, but we can deal with that when comm_open() | |
670 | * also does it. XXX -- adrian | |
671 | */ | |
672 | newfd = accept(fd, (struct sockaddr *) pn, addrlen); | |
673 | comm_fd_hack(&newfd); | |
674 | ||
675 | if(newfd < 0) | |
676 | return -1; | |
677 | ||
678 | /* Set the socket non-blocking, and other wonderful bits */ | |
679 | if(!comm_set_nb(newfd)) | |
680 | { | |
681 | libcharybdis_log("comm_accept: Couldn't set FD %d non blocking!", newfd); | |
682 | close(newfd); | |
683 | return -1; | |
684 | } | |
685 | ||
686 | /* Next, tag the FD as an incoming connection */ | |
687 | comm_open(newfd, FD_SOCKET, "Incoming connection"); | |
688 | ||
689 | /* .. and return */ | |
690 | return newfd; | |
691 | } | |
692 | ||
693 | /* | |
694 | * If a sockaddr_storage is AF_INET6 but is a mapped IPv4 | |
695 | * socket manged the sockaddr. | |
696 | */ | |
697 | #ifndef mangle_mapped_sockaddr | |
698 | void | |
699 | mangle_mapped_sockaddr(struct sockaddr *in) | |
700 | { | |
701 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in; | |
702 | ||
703 | if(in->sa_family == AF_INET) | |
704 | return; | |
705 | ||
706 | if(in->sa_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&in6->sin6_addr)) | |
707 | { | |
708 | struct sockaddr_in in4; | |
709 | memset(&in4, 0, sizeof(struct sockaddr_in)); | |
710 | in4.sin_family = AF_INET; | |
711 | in4.sin_port = in6->sin6_port; | |
712 | in4.sin_addr.s_addr = ((uint32_t *)&in6->sin6_addr)[3]; | |
713 | memcpy(in, &in4, sizeof(struct sockaddr_in)); | |
714 | } | |
715 | return; | |
716 | } | |
717 | #endif | |
718 | ||
719 | ||
720 | static void | |
721 | fdlist_update_biggest(int fd, int opening) | |
722 | { | |
723 | if(fd < highest_fd) | |
724 | return; | |
725 | s_assert(fd < MAXCONNECTIONS); | |
726 | ||
727 | if(fd > highest_fd) | |
728 | { | |
729 | /* | |
730 | * s_assert that we are not closing a FD bigger than | |
731 | * our known biggest FD | |
732 | */ | |
733 | s_assert(opening); | |
734 | highest_fd = fd; | |
735 | return; | |
736 | } | |
737 | /* if we are here, then fd == Biggest_FD */ | |
738 | /* | |
739 | * s_assert that we are closing the biggest FD; we can't be | |
740 | * re-opening it | |
741 | */ | |
742 | s_assert(!opening); | |
e70f8e92 | 743 | while (highest_fd >= 0 && comm_locate_fd(fd)->flags.open) /* XXX */ |
212380e3 | 744 | highest_fd--; |
745 | } | |
746 | ||
747 | ||
748 | void | |
749 | fdlist_init(void) | |
750 | { | |
751 | static int initialized = 0; | |
752 | ||
753 | if(!initialized) | |
754 | { | |
e70f8e92 | 755 | memset(&fd_table, '\0', sizeof(dlink_list) * FD_HASH_SIZE); |
212380e3 | 756 | initialized = 1; |
757 | } | |
758 | } | |
759 | ||
760 | /* Called to open a given filedescriptor */ | |
761 | void | |
762 | comm_open(int fd, unsigned int type, const char *desc) | |
763 | { | |
e70f8e92 | 764 | fde_t *F = comm_add_fd(fd); |
212380e3 | 765 | s_assert(fd >= 0); |
766 | ||
767 | if(F->flags.open) | |
768 | { | |
769 | comm_close(fd); | |
770 | } | |
771 | s_assert(!F->flags.open); | |
772 | F->fd = fd; | |
773 | F->type = type; | |
774 | F->flags.open = 1; | |
775 | #ifdef NOTYET | |
776 | F->defer.until = 0; | |
777 | F->defer.n = 0; | |
778 | F->defer.handler = NULL; | |
779 | #endif | |
780 | fdlist_update_biggest(fd, 1); | |
781 | F->comm_index = -1; | |
782 | F->list = FDLIST_NONE; | |
783 | if(desc) | |
784 | strlcpy(F->desc, desc, sizeof(F->desc)); | |
785 | number_fd++; | |
786 | } | |
787 | ||
788 | ||
789 | /* Called to close a given filedescriptor */ | |
790 | void | |
791 | comm_close(int fd) | |
792 | { | |
e70f8e92 | 793 | fde_t *F = comm_locate_fd(fd); |
212380e3 | 794 | s_assert(F->flags.open); |
795 | /* All disk fd's MUST go through file_close() ! */ | |
796 | s_assert(F->type != FD_FILE); | |
797 | if(F->type == FD_FILE) | |
798 | { | |
799 | s_assert(F->read_handler == NULL); | |
800 | s_assert(F->write_handler == NULL); | |
801 | } | |
802 | comm_setselect(F->fd, FDLIST_NONE, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0); | |
803 | comm_setflush(F->fd, 0, NULL, NULL); | |
df98bc52 | 804 | F->timeout = 0; |
212380e3 | 805 | |
806 | if (F->dns_query != NULL) | |
807 | { | |
808 | delete_resolver_queries(F->dns_query); | |
809 | MyFree(F->dns_query); | |
810 | F->dns_query = NULL; | |
811 | } | |
812 | ||
813 | F->flags.open = 0; | |
814 | fdlist_update_biggest(fd, 0); | |
815 | number_fd--; | |
e70f8e92 | 816 | comm_remove_fd(fd); |
817 | ||
212380e3 | 818 | /* Unlike squid, we're actually closing the FD here! -- adrian */ |
819 | close(fd); | |
820 | } | |
821 | ||
212380e3 | 822 | /* |
823 | * comm_dump() - dump the list of active filedescriptors | |
824 | */ | |
825 | void | |
826 | comm_dump(struct Client *source_p) | |
827 | { | |
828 | int i; | |
829 | ||
e70f8e92 | 830 | for (i = 0; i <= FD_HASH_SIZE; i++) |
212380e3 | 831 | { |
e70f8e92 | 832 | dlink_node *n; |
833 | ||
834 | if (dlink_list_length(&fd_table[i]) <= 0) | |
212380e3 | 835 | continue; |
836 | ||
e70f8e92 | 837 | DLINK_FOREACH(n, fd_table[i].head) |
838 | { | |
839 | fde_t *F = (fde_t *) n->data; | |
840 | ||
841 | if(F == NULL || !F->flags.open) | |
842 | continue; | |
843 | ||
844 | sendto_one_numeric(source_p, RPL_STATSDEBUG, | |
845 | "F :fd %-3d bucket %-3d desc '%s'", | |
846 | F->fd, i, F->desc); | |
847 | } | |
212380e3 | 848 | } |
849 | } | |
850 | ||
851 | /* | |
852 | * comm_note() - set the fd note | |
853 | * | |
854 | * Note: must be careful not to overflow fd_table[fd].desc when | |
855 | * calling. | |
856 | */ | |
857 | void | |
858 | comm_note(int fd, const char *format, ...) | |
859 | { | |
860 | va_list args; | |
e70f8e92 | 861 | fde_t *F = comm_add_fd(fd); /* XXX: epoll, kqueue. */ |
212380e3 | 862 | |
863 | if(format) | |
864 | { | |
865 | va_start(args, format); | |
e70f8e92 | 866 | ircvsnprintf(F->desc, FD_DESC_SZ, format, args); |
212380e3 | 867 | va_end(args); |
868 | } | |
869 | else | |
e70f8e92 | 870 | F->desc[0] = '\0'; |
212380e3 | 871 | } |
872 | ||
873 |