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21c9d815 VY |
1 | /* |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * listener.c: Listens on a port. | |
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 | * | |
24 | * $Id: listener.c 3460 2007-05-18 20:31:33Z jilles $ | |
25 | */ | |
26 | ||
27 | #include "stdinc.h" | |
28 | #include "setup.h" | |
29 | #include "listener.h" | |
30 | #include "client.h" | |
31 | #include "irc_string.h" | |
32 | #include "sprintf_irc.h" | |
33 | #include "ircd.h" | |
34 | #include "ircd_defs.h" | |
35 | #include "numeric.h" | |
36 | #include "s_conf.h" | |
37 | #include "s_newconf.h" | |
38 | #include "s_stats.h" | |
39 | #include "send.h" | |
40 | #include "s_auth.h" | |
41 | #include "reject.h" | |
42 | #include "s_conf.h" | |
43 | #include "hostmask.h" | |
44 | ||
45 | #ifndef INADDR_NONE | |
46 | #define INADDR_NONE ((unsigned int) 0xffffffff) | |
47 | #endif | |
48 | ||
49 | #if defined(NO_IN6ADDR_ANY) && defined(IPV6) | |
50 | static const struct in6_addr in6addr_any = | |
51 | { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }; | |
52 | #endif | |
53 | ||
21c9d815 VY |
54 | static listener_t *ListenerPollList = NULL; |
55 | ||
56 | static listener_t * | |
3ea5fee7 | 57 | make_listener(struct rb_sockaddr_storage *addr) |
21c9d815 VY |
58 | { |
59 | listener_t *listener = (listener_t *) rb_malloc(sizeof(listener_t)); | |
60 | s_assert(0 != listener); | |
21c9d815 | 61 | listener->name = me.name; |
fb968f05 VY |
62 | listener->F = NULL; |
63 | ||
3ea5fee7 | 64 | memcpy(&listener->addr, addr, sizeof(struct rb_sockaddr_storage)); |
21c9d815 VY |
65 | listener->next = NULL; |
66 | return listener; | |
67 | } | |
68 | ||
69 | void | |
70 | free_listener(listener_t *listener) | |
71 | { | |
72 | s_assert(NULL != listener); | |
73 | if(listener == NULL) | |
74 | return; | |
75 | /* | |
76 | * remove from listener list | |
77 | */ | |
78 | if(listener == ListenerPollList) | |
79 | ListenerPollList = listener->next; | |
80 | else | |
81 | { | |
82 | listener_t *prev = ListenerPollList; | |
83 | for (; prev; prev = prev->next) | |
84 | { | |
85 | if(listener == prev->next) | |
86 | { | |
87 | prev->next = listener->next; | |
88 | break; | |
89 | } | |
90 | } | |
91 | } | |
92 | ||
93 | /* free */ | |
94 | rb_free(listener); | |
95 | } | |
96 | ||
97 | #define PORTNAMELEN 6 /* ":31337" */ | |
98 | ||
99 | /* | |
100 | * get_listener_name - return displayable listener name and port | |
101 | * returns "host.foo.org:6667" for a given listener | |
102 | */ | |
103 | const char * | |
104 | get_listener_name(const listener_t *listener) | |
105 | { | |
106 | static char buf[HOSTLEN + HOSTLEN + PORTNAMELEN + 4]; | |
107 | int port = 0; | |
108 | ||
109 | s_assert(NULL != listener); | |
110 | if(listener == NULL) | |
111 | return NULL; | |
112 | ||
113 | #ifdef IPV6 | |
114 | if(listener->addr.ss_family == AF_INET6) | |
115 | port = ntohs(((const struct sockaddr_in6 *)&listener->addr)->sin6_port); | |
116 | else | |
117 | #endif | |
118 | port = ntohs(((const struct sockaddr_in *)&listener->addr)->sin_port); | |
119 | ||
120 | rb_snprintf(buf, sizeof(buf), "%s[%s/%u]", me.name, listener->name, port); | |
121 | return buf; | |
122 | } | |
123 | ||
124 | /* | |
125 | * show_ports - send port listing to a client | |
126 | * inputs - pointer to client to show ports to | |
127 | * output - none | |
128 | * side effects - show ports | |
129 | */ | |
130 | void | |
131 | show_ports(struct Client *source_p) | |
132 | { | |
133 | listener_t *listener = 0; | |
134 | ||
135 | for (listener = ListenerPollList; listener; listener = listener->next) | |
136 | { | |
137 | sendto_one_numeric(source_p, RPL_STATSPLINE, | |
138 | form_str(RPL_STATSPLINE), 'P', | |
139 | #ifdef IPV6 | |
140 | ntohs(listener->addr.ss_family == AF_INET ? ((struct sockaddr_in *)&listener->addr)->sin_port : | |
141 | ((struct sockaddr_in6 *)&listener->addr)->sin6_port), | |
142 | #else | |
143 | ntohs(((struct sockaddr_in *)&listener->addr)->sin_port), | |
144 | #endif | |
145 | IsOperAdmin(source_p) ? listener->name : me.name, | |
146 | listener->ref_count, (listener->active) ? "active" : "disabled"); | |
147 | } | |
148 | } | |
149 | ||
150 | /* | |
151 | * inetport - create a listener socket in the AF_INET or AF_INET6 domain, | |
152 | * bind it to the port given in 'port' and listen to it | |
153 | * returns true (1) if successful false (0) on error. | |
154 | * | |
155 | * If the operating system has a define for SOMAXCONN, use it, otherwise | |
156 | * use RATBOX_SOMAXCONN | |
157 | */ | |
158 | #ifdef SOMAXCONN | |
159 | #undef RATBOX_SOMAXCONN | |
160 | #define RATBOX_SOMAXCONN SOMAXCONN | |
161 | #endif | |
162 | ||
163 | static int | |
164 | inetport(listener_t *listener) | |
165 | { | |
fb968f05 | 166 | rb_fde_t *F; |
21c9d815 VY |
167 | int opt = 1; |
168 | ||
169 | /* | |
170 | * At first, open a new socket | |
171 | */ | |
172 | ||
fb968f05 | 173 | F = rb_socket(GET_SS_FAMILY(&listener->addr), SOCK_STREAM, 0, "Listener socket"); |
21c9d815 VY |
174 | |
175 | #ifdef IPV6 | |
176 | if(listener->addr.ss_family == AF_INET6) | |
177 | { | |
178 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&listener->addr; | |
179 | if(!IN6_ARE_ADDR_EQUAL(&in6->sin6_addr, &in6addr_any)) | |
180 | { | |
181 | inetntop(AF_INET6, &in6->sin6_addr, listener->vhost, sizeof(listener->vhost)); | |
182 | listener->name = listener->vhost; | |
183 | } | |
184 | } else | |
185 | #endif | |
186 | { | |
187 | struct sockaddr_in *in = (struct sockaddr_in *)&listener->addr; | |
188 | if(in->sin_addr.s_addr != INADDR_ANY) | |
189 | { | |
190 | inetntop(AF_INET, &in->sin_addr, listener->vhost, sizeof(listener->vhost)); | |
191 | listener->name = listener->vhost; | |
192 | } | |
193 | } | |
194 | ||
fb968f05 VY |
195 | if(F == NULL)\r |
196 | {\r | |
197 | report_error("opening listener socket %s:%s",\r | |
198 | get_listener_name(listener), \r | |
199 | get_listener_name(listener), errno);\r | |
200 | return 0;\r | |
201 | }\r | |
202 | else if((maxconnections - 10) < rb_get_fd(F)) /* XXX this is kinda bogus*/\r | |
203 | {\r | |
204 | report_error("no more connections left for listener %s:%s",\r | |
205 | get_listener_name(listener), \r | |
206 | get_listener_name(listener), errno);\r | |
207 | rb_close(F);\r | |
208 | return 0;\r | |
21c9d815 VY |
209 | } |
210 | ||
fb968f05 VY |
211 | /*\r |
212 | * XXX - we don't want to do all this crap for a listener\r | |
213 | * set_sock_opts(listener);\r | |
214 | */\r | |
215 | if(setsockopt(rb_get_fd(F), SOL_SOCKET, SO_REUSEADDR, (char *) &opt, sizeof(opt)))\r | |
216 | {\r | |
217 | report_error("setting SO_REUSEADDR for listener %s:%s",\r | |
218 | get_listener_name(listener), \r | |
219 | get_listener_name(listener), errno);\r | |
220 | rb_close(F);\r | |
221 | return 0;\r | |
21c9d815 VY |
222 | } |
223 | ||
fb968f05 VY |
224 | /*\r |
225 | * Bind a port to listen for new connections if port is non-null,\r | |
226 | * else assume it is already open and try get something from it.\r | |
227 | */\r | |
228 | \r | |
229 | if(bind(rb_get_fd(F), (struct sockaddr *) &listener->addr, GET_SS_LEN(&listener->addr)))\r | |
230 | {\r | |
231 | report_error("binding listener socket %s:%s",\r | |
232 | get_listener_name(listener), \r | |
233 | get_listener_name(listener), errno);\r | |
234 | rb_close(F);\r | |
235 | return 0;\r | |
21c9d815 VY |
236 | } |
237 | ||
fb968f05 VY |
238 | if((ret = rb_listen(F, RATBOX_SOMAXCONN)))\r |
239 | {\r | |
240 | report_error("listen failed for %s:%s", \r | |
241 | get_listener_name(listener), \r | |
242 | get_listener_name(listener), errno);\r | |
243 | rb_close(F);\r | |
244 | return 0;\r | |
21c9d815 VY |
245 | } |
246 | ||
fb968f05 VY |
247 | listener->F = F;\r |
248 | \r | |
249 | rb_accept_tcp(listener->F, accept_precallback, accept_callback, listener); | |
21c9d815 VY |
250 | return 1; |
251 | } | |
252 | ||
253 | static listener_t * | |
3ea5fee7 | 254 | find_listener(struct rb_sockaddr_storage *addr) |
21c9d815 VY |
255 | { |
256 | listener_t *listener = NULL; | |
257 | listener_t *last_closed = NULL; | |
258 | ||
259 | for (listener = ListenerPollList; listener; listener = listener->next) | |
260 | { | |
261 | if(addr->ss_family != listener->addr.ss_family) | |
262 | continue; | |
263 | ||
264 | switch(addr->ss_family) | |
265 | { | |
266 | case AF_INET: | |
267 | { | |
268 | struct sockaddr_in *in4 = (struct sockaddr_in *)addr; | |
269 | struct sockaddr_in *lin4 = (struct sockaddr_in *)&listener->addr; | |
270 | if(in4->sin_addr.s_addr == lin4->sin_addr.s_addr && | |
271 | in4->sin_port == lin4->sin_port ) | |
272 | { | |
fb968f05 VY |
273 | if(listener->F == NULL)\r |
274 | last_closed = listener;\r | |
275 | else\r | |
21c9d815 VY |
276 | return(listener); |
277 | } | |
278 | break; | |
279 | } | |
280 | #ifdef IPV6 | |
281 | case AF_INET6: | |
282 | { | |
283 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)addr; | |
284 | struct sockaddr_in6 *lin6 =(struct sockaddr_in6 *)&listener->addr; | |
285 | if(IN6_ARE_ADDR_EQUAL(&in6->sin6_addr, &lin6->sin6_addr) && | |
286 | in6->sin6_port == lin6->sin6_port) | |
287 | { | |
fb968f05 VY |
288 | if(listener->F == NULL)\r |
289 | last_closed = listener;\r | |
290 | else\r | |
21c9d815 VY |
291 | return(listener); |
292 | } | |
293 | break; | |
294 | ||
295 | } | |
296 | #endif | |
297 | ||
298 | default: | |
299 | break; | |
300 | } | |
301 | } | |
302 | return last_closed; | |
303 | } | |
304 | ||
305 | ||
306 | /* | |
307 | * add_listener- create a new listener | |
308 | * port - the port number to listen on | |
309 | * vhost_ip - if non-null must contain a valid IP address string in | |
310 | * the format "255.255.255.255" | |
311 | */ | |
312 | void | |
313 | add_listener(int port, const char *vhost_ip, int family) | |
314 | { | |
315 | listener_t *listener; | |
3ea5fee7 | 316 | struct rb_sockaddr_storage vaddr; |
21c9d815 VY |
317 | |
318 | /* | |
319 | * if no port in conf line, don't bother | |
320 | */ | |
321 | if(port == 0) | |
322 | return; | |
323 | memset(&vaddr, 0, sizeof(vaddr)); | |
324 | vaddr.ss_family = family; | |
325 | ||
326 | if(vhost_ip != NULL) | |
327 | { | |
328 | if(family == AF_INET) | |
329 | { | |
330 | if(inetpton(family, vhost_ip, &((struct sockaddr_in *)&vaddr)->sin_addr) <= 0) | |
331 | return; | |
332 | } | |
333 | #ifdef IPV6 | |
334 | else | |
335 | { | |
336 | if(inetpton(family, vhost_ip, &((struct sockaddr_in6 *)&vaddr)->sin6_addr) <= 0) | |
337 | return; | |
338 | ||
339 | } | |
340 | #endif | |
341 | } else | |
342 | { | |
343 | switch(family) | |
344 | { | |
345 | case AF_INET: | |
346 | ((struct sockaddr_in *)&vaddr)->sin_addr.s_addr = INADDR_ANY; | |
347 | break; | |
348 | #ifdef IPV6 | |
349 | case AF_INET6: | |
350 | memcpy(&((struct sockaddr_in6 *)&vaddr)->sin6_addr, &in6addr_any, sizeof(struct in6_addr)); | |
351 | break; | |
352 | default: | |
353 | return; | |
354 | #endif | |
355 | } | |
356 | } | |
357 | switch(family) | |
358 | { | |
359 | case AF_INET: | |
360 | SET_SS_LEN(vaddr, sizeof(struct sockaddr_in)); | |
361 | ((struct sockaddr_in *)&vaddr)->sin_port = htons(port); | |
362 | break; | |
363 | #ifdef IPV6 | |
364 | case AF_INET6: | |
365 | SET_SS_LEN(vaddr, sizeof(struct sockaddr_in6)); | |
366 | ((struct sockaddr_in6 *)&vaddr)->sin6_port = htons(port); | |
367 | break; | |
368 | #endif | |
369 | default: | |
370 | break; | |
371 | } | |
372 | if((listener = find_listener(&vaddr))) | |
373 | { | |
fb968f05 | 374 | if(listener->F != NULL)\r |
21c9d815 VY |
375 | return; |
376 | } | |
377 | else | |
378 | { | |
379 | listener = make_listener(&vaddr); | |
380 | listener->next = ListenerPollList; | |
381 | ListenerPollList = listener; | |
382 | } | |
383 | ||
fb968f05 | 384 | listener->F = NULL; |
21c9d815 VY |
385 | |
386 | if(inetport(listener)) | |
387 | listener->active = 1; | |
388 | else | |
389 | close_listener(listener); | |
390 | } | |
391 | ||
392 | /* | |
393 | * close_listener - close a single listener | |
394 | */ | |
395 | void | |
396 | close_listener(listener_t *listener) | |
397 | { | |
398 | s_assert(listener != NULL); | |
399 | if(listener == NULL) | |
400 | return; | |
fb968f05 VY |
401 | if(listener->F != NULL)\r |
402 | {\r | |
403 | rb_close(listener->F);\r | |
404 | listener->F = NULL;\r | |
21c9d815 VY |
405 | } |
406 | ||
407 | listener->active = 0; | |
408 | ||
409 | if(listener->ref_count) | |
410 | return; | |
411 | ||
412 | free_listener(listener); | |
413 | } | |
414 | ||
415 | /* | |
416 | * close_listeners - close and free all listeners that are not being used | |
417 | */ | |
418 | void | |
419 | close_listeners() | |
420 | { | |
421 | listener_t *listener; | |
422 | listener_t *listener_next = 0; | |
423 | /* | |
424 | * close all 'extra' listening ports we have | |
425 | */ | |
426 | for (listener = ListenerPollList; listener; listener = listener_next) | |
427 | { | |
428 | listener_next = listener->next; | |
429 | close_listener(listener); | |
430 | } | |
431 | } | |
432 | ||
433 | #define DLINE_WARNING "ERROR :You have been D-lined.\r\n" | |
434 | ||
435 | /* | |
436 | * add_connection - creates a client which has just connected to us on | |
437 | * the given fd. The sockhost field is initialized with the ip# of the host. | |
438 | * The client is sent to the auth module for verification, and not put in | |
439 | * any client list yet. | |
440 | */ | |
441 | static void | |
442 | add_connection(listener_t *listener, int fd, struct sockaddr *sai, int exempt) | |
443 | { | |
444 | struct Client *new_client; | |
445 | s_assert(NULL != listener); | |
446 | ||
447 | /* | |
448 | * get the client socket name from the socket | |
449 | * the client has already been checked out in accept_connection | |
450 | */ | |
451 | new_client = make_client(NULL); | |
452 | ||
3ea5fee7 | 453 | memcpy(&new_client->localClient->ip, sai, sizeof(struct rb_sockaddr_storage)); |
21c9d815 VY |
454 | |
455 | /* | |
456 | * copy address to 'sockhost' as a string, copy it to host too | |
457 | * so we have something valid to put into error messages... | |
458 | */ | |
459 | inetntop_sock((struct sockaddr *)&new_client->localClient->ip, new_client->sockhost, | |
460 | sizeof(new_client->sockhost)); | |
461 | ||
462 | ||
463 | strlcpy(new_client->host, new_client->sockhost, sizeof(new_client->host)); | |
464 | ||
465 | new_client->localClient->F = rb_add_fd(fd); | |
466 | ||
467 | new_client->localClient->listener = listener; | |
468 | ++listener->ref_count; | |
469 | ||
470 | if(!exempt) | |
471 | { | |
472 | if(check_reject(new_client)) | |
473 | return; | |
474 | if(add_unknown_ip(new_client)) | |
475 | return; | |
476 | } | |
477 | ||
478 | start_auth(new_client); | |
479 | } |