1 /************************************************************************
2 * IRC - Internet Relay Chat, src/listener.c
3 * Copyright (C) 1999 Thomas Helvey <tomh@inxpress.net>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 1, or (at your option)
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "ircd_alloc.h"
27 #include "ircd_events.h"
28 #include "ircd_features.h"
29 #include "ircd_osdep.h"
30 #include "ircd_reply.h"
31 #include "ircd_string.h"
37 #include "sprintf_irc.h"
38 #include "sys.h" /* MAXCLIENTS */
47 #include <sys/socket.h>
48 #include <arpa/inet.h>
51 #define INADDR_NONE ((unsigned int) 0xffffffff)
54 struct Listener* ListenerPollList = 0;
56 static void accept_connection(struct Event* ev);
58 static struct Listener* make_listener(int port, struct in_addr addr)
60 struct Listener* listener =
61 (struct Listener*) MyMalloc(sizeof(struct Listener));
62 assert(0 != listener);
64 memset(listener, 0, sizeof(struct Listener));
67 listener->port = port;
68 listener->addr.s_addr = addr.s_addr;
70 #ifdef NULL_POINTER_NOT_ZERO
71 listener->next = NULL;
72 listener->conf = NULL;
77 static void free_listener(struct Listener* listener)
79 assert(0 != listener);
83 #define PORTNAMELEN 10 /* ":31337" */
86 * get_listener_name - return displayable listener name and port
87 * returns "host.foo.org:6667" for a given listener
89 const char* get_listener_name(const struct Listener* listener)
91 static char buf[HOSTLEN + PORTNAMELEN + 4];
92 assert(0 != listener);
93 sprintf_irc(buf, "%s:%u", cli_name(&me), listener->port);
98 * count_listener_memory - count memory and listeners
100 void count_listener_memory(int* count_out, size_t* size_out)
104 assert(0 != count_out);
105 assert(0 != size_out);
106 for (l = ListenerPollList; l; l = l->next)
109 *size_out = count * sizeof(struct Listener);
113 * show_ports - send port listing to a client
114 * inputs - pointer to client to show ports to
116 * side effects - show ports
119 void show_ports(struct Client* sptr, int show_hidden, int port, int count)
121 struct Listener* listener = 0;
125 for (listener = ListenerPollList; listener; listener = listener->next) {
126 if (port && port != listener->port)
128 flags[0] = (listener->server) ? 'S' : 'C';
129 if (listener->hidden) {
138 send_reply(sptr, RPL_STATSPLINE, listener->port, listener->ref_count,
139 flags, (listener->active) ? "active" : "disabled");
146 * inetport - create a listener socket in the AF_INET domain,
147 * bind it to the port given in 'port' and listen to it
148 * returns true (1) if successful false (0) on error.
150 * If the operating system has a define for SOMAXCONN, use it, otherwise
151 * use HYBRID_SOMAXCONN -Dianora
152 * NOTE: Do this in os_xxxx.c files
155 #define HYBRID_SOMAXCONN SOMAXCONN
157 #define HYBRID_SOMAXCONN 64
160 static int inetport(struct Listener* listener)
162 struct sockaddr_in sin;
166 * At first, open a new socket
168 if (-1 == (fd = socket(AF_INET, SOCK_STREAM, 0))) {
169 report_error(SOCKET_ERROR_MSG, get_listener_name(listener), errno);
172 else if (fd > MAXCLIENTS - 1) {
173 report_error(CONNLIMIT_ERROR_MSG, get_listener_name(listener), 0);
178 if (!os_set_reuseaddr(fd)) {
179 report_error(REUSEADDR_ERROR_MSG, get_listener_name(listener), errno);
184 * Bind a port to listen for new connections if port is non-null,
185 * else assume it is already open and try get something from it.
187 memset(&sin, 0, sizeof(sin));
188 sin.sin_family = AF_INET;
189 sin.sin_addr = listener->addr;
190 sin.sin_port = htons(listener->port);
192 if (bind(fd, (struct sockaddr*) &sin, sizeof(sin))) {
193 report_error(BIND_ERROR_MSG, get_listener_name(listener), errno);
198 * Set the buffer sizes for the listener. Accepted connections
199 * inherit the accepting sockets settings for SO_RCVBUF S_SNDBUF
200 * The window size is set during the SYN ACK so setting it anywhere
201 * else has no effect whatsoever on the connection.
202 * NOTE: this must be set before listen is called
204 if (!os_set_sockbufs(fd, (listener->server) ? SERVER_TCP_WINDOW : CLIENT_TCP_WINDOW)) {
205 report_error(SETBUFS_ERROR_MSG, get_listener_name(listener), errno);
209 if (!os_set_listen(fd, HYBRID_SOMAXCONN)) {
210 report_error(LISTEN_ERROR_MSG, get_listener_name(listener), errno);
215 * XXX - this should always work, performance will suck if it doesn't
217 if (!os_set_nonblocking(fd)) {
218 report_error(NONB_ERROR_MSG, get_listener_name(listener), errno);
223 * Set the TOS bits - this is nonfatal if it doesn't stick.
225 if (!os_set_tos(fd,feature_int((listener->server)?FEAT_TOS_SERVER : FEAT_TOS_CLIENT))) {
226 report_error(TOS_ERROR_MSG, get_listener_name(listener), errno);
229 if (!socket_add(&listener->socket, accept_connection, (void*) listener,
230 SS_LISTENING, 0, fd)) {
231 /* Error should already have been reported to the logs */
242 * find_listener - find a listener in the list
244 * XXX - this function does N comparisons so if the list is huge
245 * we may want to do something else for this. (rehash and init use this)
247 static struct Listener* find_listener(int port, struct in_addr addr)
249 struct Listener* listener;
250 for (listener = ListenerPollList; listener; listener = listener->next) {
251 if (port == listener->port && addr.s_addr == listener->addr.s_addr)
258 * set_listener_mask - set the connection mask for this listener
260 static void set_listener_mask(struct Listener* listener, const char* mask)
265 assert(0 != listener);
267 if (EmptyString(mask) || 0 == strcmp(mask, "*")) {
268 listener->mask.s_addr = 0;
271 ad[0] = ad[1] = ad[2] = ad[3] = 0;
273 * do it this way because building ip# from separate values for each
274 * byte requires endian knowledge or some nasty messing. Also means
275 * easy conversion of "*" 0.0.0.0 or 134.* to 134.0.0.0 :-)
277 sscanf(mask, "%d.%d.%d.%d", &ad[0], &ad[1], &ad[2], &ad[3]);
278 sprintf_irc(ipname, "%d.%d.%d.%d", ad[0], ad[1], ad[2], ad[3]);
279 listener->mask.s_addr = inet_addr(ipname);
283 * connection_allowed - spin through mask and addr passed to see if connect
284 * allowed on a listener, uses mask generated by set_listener_mask
286 static int connection_allowed(const char* addr, const char* mask)
289 for ( ; i > 0; --i) {
290 if (*mask && *addr != *mask)
300 * add_listener- create a new listener
301 * port - the port number to listen on
302 * vhost_ip - if non-null must contain a valid IP address string in
303 * the format "255.255.255.255"
305 void add_listener(int port, const char* vhost_ip, const char* mask,
306 int is_server, int is_hidden)
308 struct Listener* listener;
309 struct in_addr vaddr;
312 * if no port in conf line, don't bother
317 vaddr.s_addr = INADDR_ANY;
319 if (!EmptyString(vhost_ip) && strcmp(vhost_ip,"*") != 0) {
320 vaddr.s_addr = inet_addr(vhost_ip);
321 if (INADDR_NONE == vaddr.s_addr)
325 if ((listener = find_listener(port, vaddr))) {
327 * set active flag and change connect mask here, it's the only thing
328 * that can change on a rehash
330 listener->active = 1;
331 set_listener_mask(listener, mask);
332 listener->hidden = is_hidden;
333 listener->server = is_server;
337 listener = make_listener(port, vaddr);
339 if (inetport(listener)) {
340 listener->active = 1;
341 set_listener_mask(listener, mask);
342 listener->hidden = is_hidden;
343 listener->server = is_server;
344 listener->next = ListenerPollList;
345 ListenerPollList = listener;
348 free_listener(listener);
352 * mark_listeners_closing - iterate through listeners and mark them as
355 void mark_listeners_closing(void)
357 struct Listener* listener;
358 for (listener = ListenerPollList; listener; listener = listener->next)
359 listener->active = 0;
363 * close_listener - close a single listener
365 void close_listener(struct Listener* listener)
367 assert(0 != listener);
369 * remove from listener list
371 if (listener == ListenerPollList)
372 ListenerPollList = listener->next;
374 struct Listener* prev = ListenerPollList;
375 for ( ; prev; prev = prev->next) {
376 if (listener == prev->next) {
377 prev->next = listener->next;
382 if (-1 < listener->fd)
384 socket_del(&listener->socket);
388 * close_listeners - close and free all listeners that are not being used
390 void close_listeners()
392 struct Listener* listener;
393 struct Listener* listener_next = 0;
395 * close all 'extra' listening ports we have
397 for (listener = ListenerPollList; listener; listener = listener_next) {
398 listener_next = listener->next;
399 if (0 == listener->active && 0 == listener->ref_count)
400 close_listener(listener);
404 void release_listener(struct Listener* listener)
406 assert(0 != listener);
407 assert(0 < listener->ref_count);
408 if (0 == --listener->ref_count && !listener->active)
409 close_listener(listener);
413 * accept_connection - accept a connection on a listener
415 static void accept_connection(struct Event* ev)
417 struct Listener* listener;
418 struct sockaddr_in addr = { 0 };
419 unsigned int addrlen = sizeof(struct sockaddr_in);
422 assert(0 != ev_socket(ev));
423 assert(0 != s_data(ev_socket(ev)));
425 listener = s_data(ev_socket(ev));
427 if (ev_type(ev) == ET_DESTROY) /* being destroyed */
428 free_listener(listener);
430 assert(ev_type(ev) == ET_ACCEPT);
432 listener->last_accept = CurrentTime;
434 * There may be many reasons for error return, but
435 * in otherwise correctly working environment the
436 * probable cause is running out of file descriptors
437 * (EMFILE, ENFILE or others?). The man pages for
438 * accept don't seem to list these as possible,
439 * although it's obvious that it may happen here.
440 * Thus no specific errors are tested at this
441 * point, just assume that connections cannot
442 * be accepted until some old is closed first.
444 if (-1 == (fd = accept(listener->fd, (struct sockaddr*) &addr,
446 /* Lotsa admins seem to have problems with not giving enough file
447 * descriptors to their server so we'll add a generic warning mechanism
448 * here. If it turns out too many messages are generated for
449 * meaningless reasons we can filter them back.
451 sendto_opmask_butone(0, SNO_TCPCOMMON,
452 "Unable to accept connection: %m");
456 * check for connection limit
458 if (fd > MAXCLIENTS - 1) {
459 ++ServerStats->is_ref;
460 send(fd, "ERROR :All connections in use\r\n", 32, 0);
465 * check to see if listener is shutting down
467 if (!listener->active) {
468 ++ServerStats->is_ref;
469 send(fd, "ERROR :Use another port\r\n", 25, 0);
474 * check to see if connection is allowed for this address mask
476 if (!connection_allowed((const char*) &addr,
477 (const char*) &listener->mask)) {
478 ++ServerStats->is_ref;
479 send(fd, "ERROR :Use another port\r\n", 25, 0);
485 * check conf for ip address access
487 if (!conf_connect_allowed(addr.sin_addr)) {
488 ++ServerStats->is_ref;
489 send(fd, "ERROR :Not authorized\r\n", 23, 0);
494 ++ServerStats->is_ac;
495 /* nextping = CurrentTime; */
497 add_connection(listener, fd);