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source: irc_commands.c @ 7ec2ce8

Last change on this file since 7ec2ce8 was b097945, checked in by Wilmer van der Gaast <github@…>, at 2017-04-06T20:25:08Z
Move canohost functions (diff licence) to separate file.
Property mode set to `100644`
File size: 26.8 KB

Line
1	/********************************************************************\
2	* BitlBee -- An IRC to other IM-networks gateway *
3	* *
4	* Copyright 2002-2012 Wilmer van der Gaast and others *
5	\********************************************************************/
6
7	/* IRC commands */
8
9	/*
10	This program is free software; you can redistribute it and/or modify
11	it under the terms of the GNU General Public License as published by
12	the Free Software Foundation; either version 2 of the License, or
13	(at your option) any later version.
14
15	This program is distributed in the hope that it will be useful,
16	but WITHOUT ANY WARRANTY; without even the implied warranty of
17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	GNU General Public License for more details.
19
20	You should have received a copy of the GNU General Public License with
21	the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
22	if not, write to the Free Software Foundation, Inc., 51 Franklin St.,
23	Fifth Floor, Boston, MA 02110-1301 USA
24	*/
25
26	#define BITLBEE_CORE
27	#include "bitlbee.h"
28	#include "canohost.h"
29	#include "help.h"
30	#include "ipc.h"
31	#include "base64.h"
32
33	static void irc_cmd_pass(irc_t irc, char *cmd)
34	{
35	if (irc->status & USTATUS_LOGGED_IN) {
36	char *send_cmd[] = { "identify", cmd[1], NULL };
37
38	/* We're already logged in, this client seems to send the PASS
39	command last. (Possibly it won't send it at all if it turns
40	out we don't require it, which will break this feature.)
41	Try to identify using the given password. */
42	root_command(irc, send_cmd);
43	return;
44	}
45	/* Handling in pre-logged-in state, first see if this server is
46	password-protected: */
47	else if (global.conf->auth_pass &&
48	(strncmp(global.conf->auth_pass, "md5:", 4) == 0 ?
49	md5_verify_password(cmd[1], global.conf->auth_pass + 4) == 0 :
50	strcmp(cmd[1], global.conf->auth_pass) == 0)) {
51	irc->status \|= USTATUS_AUTHORIZED;
52	irc_check_login(irc);
53	} else if (global.conf->auth_pass) {
54	irc_send_num(irc, 464, ":Incorrect password");
55	} else {
56	/* Remember the password and try to identify after USER/NICK. */
57	irc_setpass(irc, cmd[1]);
58	irc_check_login(irc);
59	}
60	}
61
62	/* http://www.haproxy.org/download/1.8/doc/proxy-protocol.txt
63
64	This isn't actually IRC, it's used by for example stunnel4 to indicate
65	the origin of the secured counterpart of the connection. It'll go wrong
66	with arguments starting with : like for example "::1" but I guess I'm
67	okay with that. */
68	static void irc_cmd_proxy(irc_t irc, char *cmd)
69	{
70	struct addrinfo hints, *ai;
71	struct sockaddr_storage sock;
72	socklen_t socklen = sizeof(sock);
73
74	if (getpeername(irc->fd, (struct sockaddr*) &sock, &socklen) != 0) {
75	return;
76	}
77
78	ipv64_normalise_mapped(&sock, &socklen);
79
80	/* Only accept PROXY "command" on localhost sockets. */
81	if (!((sock.ss_family == AF_INET &&
82	ntohl(((struct sockaddr_in*)&sock)->sin_addr.s_addr) == INADDR_LOOPBACK) \|\|
83	(sock.ss_family == AF_INET6 &&
84	IN6_IS_ADDR_LOOPBACK(&((struct sockaddr_in6*)&sock)->sin6_addr)))) {
85	return;
86	}
87
88	/* And only once. Do this with a pretty dumb regex-match for
89	now, maybe better to use some sort of flag.. */
90	if (!g_regex_match_simple("^(ip6-)?localhost(.(localdomain.?)?)?$", irc->user->host, 0, 0)) {
91	return;
92	}
93
94	memset(&hints, 0, sizeof(hints));
95	hints.ai_flags = AI_NUMERICHOST;
96	if (getaddrinfo(cmd[2], NULL, &hints, &ai) != 0) {
97	return;
98	}
99
100	irc_set_hosts(irc, ai->ai_addr, ai->ai_addrlen);
101	freeaddrinfo(ai);
102	}
103
104	static gboolean irc_sasl_plain_parse(char input, char user, char *pass)
105	{
106	int i, part, len;
107	guint8 *decoded;
108	char *parts[3];
109
110	/* bitlbee's base64_decode wrapper adds an extra null terminator at the end */
111	len = base64_decode(input, &decoded);
112
113	/* this loop splits the decoded string into the parts array, like this:
114	"username\0username\0password" -> {"username", "username", "password"} */
115
116	for (i = 0, part = 0; i < len && part < 3; part++) {
117	/* set each of parts[] to point to the beginning of a string */
118	parts[part] = (char *) decoded + i;
119
120	/* move the cursor forward to the next null terminator*/
121	i += strlen(parts[part]) + 1;
122	}
123
124	/* sanity checks */
125	if (part != 3 \|\| i != (len + 1) \|\| (parts[0][0] && strcmp(parts[0], parts[1]) != 0)) {
126	g_free(decoded);
127	return FALSE;
128	} else {
129	*user = g_strdup(parts[1]);
130	*pass = g_strdup(parts[2]);
131	g_free(decoded);
132	return TRUE;
133	}
134	}
135
136	static gboolean irc_sasl_check_pass(irc_t irc, char user, char *pass)
137	{
138	storage_status_t status;
139
140	/* just check the password here to be able to reply with useful numerics
141	* the actual identification will be handled later */
142	status = auth_check_pass(irc, user, pass);
143
144	if (status == STORAGE_OK) {
145	if (!irc->user->nick) {
146	/* set the nick here so we have it for the following numeric */
147	irc->user->nick = g_strdup(user);
148	}
149	irc_send_num(irc, 903, ":Password accepted");
150	return TRUE;
151
152	} else if (status == STORAGE_INVALID_PASSWORD) {
153	irc_send_num(irc, 904, ":Incorrect password");
154	} else if (status == STORAGE_NO_SUCH_USER) {
155	irc_send_num(irc, 904, ":The nick is (probably) not registered");
156	} else {
157	irc_send_num(irc, 904, ":Unknown SASL authentication error");
158	}
159
160	return FALSE;
161	}
162
163	static void irc_cmd_authenticate(irc_t irc, char *cmd)
164	{
165	/* require the CAP to be enabled, and don't allow authentication before server password */
166	if (!(irc->caps & CAP_SASL) \|\|
167	(global.conf->authmode == AUTHMODE_CLOSED && !(irc->status & USTATUS_AUTHORIZED))) {
168	return;
169	}
170
171	if (irc->status & USTATUS_SASL_PLAIN_PENDING) {
172	char user, pass;
173
174	irc->status &= ~USTATUS_SASL_PLAIN_PENDING;
175
176	if (!irc_sasl_plain_parse(cmd[1], &user, &pass)) {
177	irc_send_num(irc, 904, ":SASL authentication failed");
178	return;
179	}
180
181	/* let's not support the nick != user case
182	* if NICK is received after SASL, it will just fail after registration */
183	if (user && irc->user->nick && strcmp(user, irc->user->nick) != 0) {
184	irc_send_num(irc, 902, ":Your SASL username does not match your nickname");
185
186	} else if (irc_sasl_check_pass(irc, user, pass)) {
187	/* and here we do the same thing as the PASS command*/
188	if (irc->status & USTATUS_LOGGED_IN) {
189	char *send_cmd[] = { "identify", pass, NULL };
190	root_command(irc, send_cmd);
191	} else {
192	/* no check_login here - wait for CAP END */
193	irc_setpass(irc, pass);
194	}
195	}
196
197	g_free(user);
198	g_free(pass);
199
200	} else if (irc->status & USTATUS_IDENTIFIED) {
201	irc_send_num(irc, 907, ":You have already authenticated");
202
203	} else if (strcmp(cmd[1], "*") == 0) {
204	irc_send_num(irc, 906, ":SASL authentication aborted");
205	irc->status &= ~USTATUS_SASL_PLAIN_PENDING;
206
207	} else if (g_strcasecmp(cmd[1], "PLAIN") == 0) {
208	irc_write(irc, "AUTHENTICATE +");
209	irc->status \|= USTATUS_SASL_PLAIN_PENDING;
210
211	} else {
212	irc_send_num(irc, 908, "PLAIN :is the available SASL mechanism");
213	irc_send_num(irc, 904, ":SASL authentication failed");
214	irc->status &= ~USTATUS_SASL_PLAIN_PENDING;
215	}
216	}
217
218	static void irc_cmd_user(irc_t irc, char *cmd)
219	{
220	irc->user->user = g_strdup(cmd[1]);
221	irc->user->fullname = g_strdup(cmd[4]);
222
223	irc_check_login(irc);
224	}
225
226	static void irc_cmd_nick(irc_t irc, char *cmd)
227	{
228	irc_user_t *iu;
229
230	if ((iu = irc_user_by_name(irc, cmd[1])) && iu != irc->user) {
231	irc_send_num(irc, 433, "%s :This nick is already in use", cmd[1]);
232	} else if (!nick_ok(NULL, cmd[1])) {
233	/* [SH] Invalid characters. */
234	irc_send_num(irc, 432, "%s :This nick contains invalid characters", cmd[1]);
235	} else if (irc->status & USTATUS_LOGGED_IN) {
236	/* WATCH OUT: iu from the first if reused here to check if the
237	new nickname is the same (other than case, possibly). If it
238	is, no need to reset identify-status. */
239	if ((irc->status & USTATUS_IDENTIFIED) && iu != irc->user) {
240	irc_setpass(irc, NULL);
241	irc->status &= ~USTATUS_IDENTIFIED;
242	irc_umode_set(irc, "-R", 1);
243
244	if (irc->caps & CAP_SASL) {
245	irc_send_num(irc, 901, "%s!%s@%s :You are now logged out",
246	irc->user->nick, irc->user->user, irc->user->host);
247	}
248
249	irc_rootmsg(irc, "Changing nicks resets your identify status. "
250	"Re-identify or register a new account if you want "
251	"your configuration to be saved. See \x02help "
252	"nick_changes\x02.");
253	}
254
255	if (strcmp(cmd[1], irc->user->nick) != 0) {
256	irc_user_set_nick(irc->user, cmd[1]);
257	}
258	} else {
259	g_free(irc->user->nick);
260	irc->user->nick = g_strdup(cmd[1]);
261
262	irc_check_login(irc);
263	}
264	}
265
266	static void irc_cmd_quit(irc_t irc, char *cmd)
267	{
268	if (cmd[1] && *cmd[1]) {
269	irc_abort(irc, 0, "Quit: %s", cmd[1]);
270	} else {
271	irc_abort(irc, 0, "Leaving...");
272	}
273	}
274
275	static void irc_cmd_ping(irc_t irc, char *cmd)
276	{
277	irc_write(irc, ":%s PONG %s :%s", irc->root->host,
278	irc->root->host, cmd[1] ? cmd[1] : irc->root->host);
279	}
280
281	static void irc_cmd_pong(irc_t irc, char *cmd)
282	{
283	/* We could check the value we get back from the user, but in
284	fact we don't care, we're just happy s/he's still alive. */
285	irc->last_pong = gettime();
286	irc->pinging = 0;
287	}
288
289	static void irc_cmd_join(irc_t irc, char *cmd)
290	{
291	char comma, s = cmd[1];
292
293	while (s) {
294	irc_channel_t *ic;
295
296	if ((comma = strchr(s, ','))) {
297	*comma = '\0';
298	}
299
300	if ((ic = irc_channel_by_name(irc, s)) == NULL &&
301	(ic = irc_channel_new(irc, s))) {
302	if (strcmp(set_getstr(&ic->set, "type"), "control") != 0) {
303	/* Autoconfiguration is for control channels only ATM. */
304	} else if (bee_group_by_name(ic->irc->b, ic->name + 1, FALSE)) {
305	set_setstr(&ic->set, "group", ic->name + 1);
306	set_setstr(&ic->set, "fill_by", "group");
307	} else if (set_setstr(&ic->set, "protocol", ic->name + 1)) {
308	set_setstr(&ic->set, "fill_by", "protocol");
309	} else if (set_setstr(&ic->set, "account", ic->name + 1)) {
310	set_setstr(&ic->set, "fill_by", "account");
311	} else {
312	/* The set commands above will run this already,
313	but if we didn't hit any, we have to fill the
314	channel with the default population. */
315	bee_irc_channel_update(ic->irc, ic, NULL);
316	}
317	} else if (ic == NULL) {
318	irc_send_num(irc, 479, "%s :Invalid channel name", s);
319	goto next;
320	}
321
322	if (ic->flags & IRC_CHANNEL_JOINED) {
323	/* Dude, you're already there...
324	RFC doesn't have any reply for that though? */
325	goto next;
326	}
327
328	if (ic->f->join && !ic->f->join(ic)) {
329	/* The story is: FALSE either means the handler
330	showed an error message, or is doing some work
331	before the join should be confirmed. (In the
332	latter case, the caller should take care of that
333	confirmation.) TRUE means all's good, let the
334	user join the channel right away. */
335	goto next;
336	}
337
338	irc_channel_add_user(ic, irc->user);
339
340	next:
341	if (comma) {
342	s = comma + 1;
343	*comma = ',';
344	} else {
345	break;
346	}
347	}
348	}
349
350	static void irc_cmd_names(irc_t irc, char *cmd)
351	{
352	irc_channel_t *ic;
353
354	if (cmd[1] && (ic = irc_channel_by_name(irc, cmd[1]))) {
355	irc_send_names(ic);
356	}
357	/* With no args, we should show /names of all chans. Make the code
358	below work well if necessary.
359	else
360	{
361	GSList *l;
362
363	for( l = irc->channels; l; l = l->next )
364	irc_send_names( l->data );
365	}
366	*/
367	}
368
369	static void irc_cmd_part(irc_t irc, char *cmd)
370	{
371	irc_channel_t *ic;
372
373	if ((ic = irc_channel_by_name(irc, cmd[1])) == NULL) {
374	irc_send_num(irc, 403, "%s :No such channel", cmd[1]);
375	} else if (irc_channel_del_user(ic, irc->user, IRC_CDU_PART, cmd[2])) {
376	if (ic->f->part) {
377	ic->f->part(ic, NULL);
378	}
379	} else {
380	irc_send_num(irc, 442, "%s :You're not on that channel", cmd[1]);
381	}
382	}
383
384	static void irc_cmd_whois(irc_t irc, char *cmd)
385	{
386	char *nick = cmd[1];
387	irc_user_t *iu = irc_user_by_name(irc, nick);
388
389	if (iu) {
390	irc_send_whois(iu);
391	} else {
392	irc_send_num(irc, 401, "%s :Nick does not exist", nick);
393	}
394	}
395
396	static void irc_cmd_whowas(irc_t irc, char *cmd)
397	{
398	/* For some reason irssi tries a whowas when whois fails. We can
399	ignore this, but then the user never gets a "user not found"
400	message from irssi which is a bit annoying. So just respond
401	with not-found and irssi users will get better error messages */
402
403	irc_send_num(irc, 406, "%s :Nick does not exist", cmd[1]);
404	irc_send_num(irc, 369, "%s :End of WHOWAS", cmd[1]);
405	}
406
407	static void irc_cmd_motd(irc_t irc, char *cmd)
408	{
409	irc_send_motd(irc);
410	}
411
412	static void irc_cmd_mode(irc_t irc, char *cmd)
413	{
414	if (irc_channel_name_ok(cmd[1])) {
415	irc_channel_t *ic;
416
417	if ((ic = irc_channel_by_name(irc, cmd[1])) == NULL) {
418	irc_send_num(irc, 403, "%s :No such channel", cmd[1]);
419	} else if (cmd[2]) {
420	if (cmd[2] == '+' \|\| cmd[2] == '-') {
421	irc_send_num(irc, 477, "%s :Can't change channel modes", cmd[1]);
422	} else if (*cmd[2] == 'b') {
423	irc_send_num(irc, 368, "%s :No bans possible", cmd[1]);
424	}
425	} else {
426	irc_send_num(irc, 324, "%s +%s", cmd[1], ic->mode);
427	}
428	} else {
429	if (nick_cmp(NULL, cmd[1], irc->user->nick) == 0) {
430	if (cmd[2]) {
431	irc_umode_set(irc, cmd[2], 0);
432	} else {
433	irc_send_num(irc, 221, "+%s", irc->umode);
434	}
435	} else {
436	irc_send_num(irc, 502, ":Don't touch their modes");
437	}
438	}
439	}
440
441	static void irc_cmd_who(irc_t irc, char *cmd)
442	{
443	char *channel = cmd[1];
444	irc_channel_t *ic;
445	irc_user_t *iu;
446
447	if (!channel \|\| channel == '0' \|\| channel == '' \|\| !channel) {
448	irc_send_who(irc, irc->users, "**");
449	} else if ((ic = irc_channel_by_name(irc, channel))) {
450	irc_send_who(irc, ic->users, channel);
451	} else if ((iu = irc_user_by_name(irc, channel))) {
452	/* Tiny hack! */
453	GSList *l = g_slist_append(NULL, iu);
454	irc_send_who(irc, l, channel);
455	g_slist_free(l);
456	} else {
457	irc_send_num(irc, 403, "%s :No such channel", channel);
458	}
459	}
460
461	static void irc_cmd_privmsg(irc_t irc, char *cmd)
462	{
463	irc_channel_t *ic;
464	irc_user_t *iu;
465
466	if (!cmd[2]) {
467	irc_send_num(irc, 412, ":No text to send");
468	return;
469	}
470
471	/* Don't treat CTCP actions as real CTCPs, just convert them right now. */
472	if (g_strncasecmp(cmd[2], "\001ACTION", 7) == 0) {
473	cmd[2] += 4;
474	memcpy(cmd[2], "/me", 3);
475	if (cmd[2][strlen(cmd[2]) - 1] == '\001') {
476	cmd[2][strlen(cmd[2]) - 1] = '\0';
477	}
478	}
479
480	if (irc_channel_name_ok(cmd[1]) &&
481	(ic = irc_channel_by_name(irc, cmd[1]))) {
482	if (cmd[2][0] == '\001') {
483	/* CTCPs to channels? Nah. Maybe later. */
484	} else if (ic->f->privmsg) {
485	ic->f->privmsg(ic, cmd[2]);
486	}
487	} else if ((iu = irc_user_by_name(irc, cmd[1]))) {
488	if (cmd[2][0] == '\001') {
489	char **ctcp;
490
491	if (iu->f->ctcp == NULL) {
492	return;
493	}
494	if (cmd[2][strlen(cmd[2]) - 1] == '\001') {
495	cmd[2][strlen(cmd[2]) - 1] = '\0';
496	}
497
498	ctcp = split_command_parts(cmd[2] + 1, 0);
499	iu->f->ctcp(iu, ctcp);
500	} else if (iu->f->privmsg) {
501	iu->last_channel = NULL;
502	iu->f->privmsg(iu, cmd[2]);
503	}
504	} else {
505	irc_send_num(irc, 401, "%s :No such nick/channel", cmd[1]);
506	}
507	}
508
509	static void irc_cmd_notice(irc_t irc, char *cmd)
510	{
511	irc_user_t *iu;
512
513	if (!cmd[2]) {
514	irc_send_num(irc, 412, ":No text to send");
515	return;
516	}
517
518	/* At least for now just echo. IIRC some IRC clients use self-notices
519	for lag checks, so try to support that. */
520	if (nick_cmp(NULL, cmd[1], irc->user->nick) == 0) {
521	irc_send_msg(irc->user, "NOTICE", irc->user->nick, cmd[2], NULL);
522	} else if ((iu = irc_user_by_name(irc, cmd[1]))) {
523	iu->f->privmsg(iu, cmd[2]);
524	}
525	}
526
527	static void irc_cmd_nickserv(irc_t irc, char *cmd)
528	{
529	/* [SH] This aliases the NickServ command to PRIVMSG root */
530	/* [TV] This aliases the NS command to PRIVMSG root as well */
531	root_command(irc, cmd + 1);
532	}
533
534	static void irc_cmd_oper_hack(irc_t irc, char *cmd);
535
536	static void irc_cmd_oper(irc_t irc, char *cmd)
537	{
538	/* Very non-standard evil but useful/secure hack, see below. */
539	if (irc->status & OPER_HACK_ANY) {
540	return irc_cmd_oper_hack(irc, cmd);
541	}
542
543	if (global.conf->oper_pass &&
544	(strncmp(global.conf->oper_pass, "md5:", 4) == 0 ?
545	md5_verify_password(cmd[2], global.conf->oper_pass + 4) == 0 :
546	strcmp(cmd[2], global.conf->oper_pass) == 0)) {
547	irc_umode_set(irc, "+o", 1);
548	irc_send_num(irc, 381, ":Password accepted");
549	} else {
550	irc_send_num(irc, 491, ":Incorrect password");
551	}
552	}
553
554	static void irc_cmd_oper_hack(irc_t irc, char *cmd)
555	{
556	char *password = g_strjoinv(" ", cmd + 2);
557
558	/* /OPER can now also be used to enter IM/identify passwords without
559	echoing. It's a hack but the extra password security is worth it. */
560	if (irc->status & OPER_HACK_ACCOUNT_PASSWORD) {
561	account_t *a;
562
563	for (a = irc->b->accounts; a; a = a->next) {
564	if (strcmp(a->pass, PASSWORD_PENDING) == 0) {
565	set_setstr(&a->set, "password", password);
566	irc_rootmsg(irc, "Password added to IM account "
567	"%s", a->tag);
568	/* The IRC client may expect this. 491 suggests the OPER
569	password was wrong, so the client won't expect a +o.
570	It may however repeat the password prompt. We'll see. */
571	irc_send_num(irc, 491, ":Password added to IM account "
572	"%s", a->tag);
573	}
574	}
575	} else if (irc->status & OPER_HACK_IDENTIFY) {
576	char *send_cmd[] = { "identify", password, NULL, NULL };
577	irc->status &= ~OPER_HACK_IDENTIFY;
578	if (irc->status & OPER_HACK_IDENTIFY_NOLOAD) {
579	send_cmd[1] = "-noload";
580	send_cmd[2] = password;
581	} else if (irc->status & OPER_HACK_IDENTIFY_FORCE) {
582	send_cmd[1] = "-force";
583	send_cmd[2] = password;
584	}
585	irc_send_num(irc, 491, ":Trying to identify");
586	root_command(irc, send_cmd);
587	} else if (irc->status & OPER_HACK_REGISTER) {
588	char *send_cmd[] = { "register", password, NULL };
589	irc_send_num(irc, 491, ":Trying to identify");
590	root_command(irc, send_cmd);
591	}
592
593	irc->status &= ~OPER_HACK_ANY;
594	g_free(password);
595	}
596
597	static void irc_cmd_invite(irc_t irc, char *cmd)
598	{
599	irc_channel_t *ic;
600	irc_user_t *iu;
601
602	if ((iu = irc_user_by_name(irc, cmd[1])) == NULL) {
603	irc_send_num(irc, 401, "%s :No such nick", cmd[1]);
604	return;
605	} else if ((ic = irc_channel_by_name(irc, cmd[2])) == NULL) {
606	irc_send_num(irc, 403, "%s :No such channel", cmd[2]);
607	return;
608	}
609
610	if (!ic->f->invite) {
611	irc_send_num(irc, 482, "%s :Can't invite people here", cmd[2]);
612	} else if (ic->f->invite(ic, iu)) {
613	irc_send_num(irc, 341, "%s %s", iu->nick, ic->name);
614	}
615	}
616
617	static void irc_cmd_kick(irc_t irc, char *cmd)
618	{
619	irc_channel_t *ic;
620	irc_user_t *iu;
621
622	if ((iu = irc_user_by_name(irc, cmd[2])) == NULL) {
623	irc_send_num(irc, 401, "%s :No such nick", cmd[2]);
624	return;
625	} else if ((ic = irc_channel_by_name(irc, cmd[1])) == NULL) {
626	irc_send_num(irc, 403, "%s :No such channel", cmd[1]);
627	return;
628	} else if (!ic->f->kick) {
629	irc_send_num(irc, 482, "%s :Can't kick people here", cmd[1]);
630	return;
631	}
632
633	ic->f->kick(ic, iu, cmd[3] ? cmd[3] : NULL);
634	}
635
636	static void irc_cmd_userhost(irc_t irc, char *cmd)
637	{
638	int i;
639
640	/* [TV] Usable USERHOST-implementation according to
641	RFC1459. Without this, mIRC shows an error
642	while connecting, and the used way of rejecting
643	breaks standards.
644	*/
645
646	for (i = 1; cmd[i]; i++) {
647	irc_user_t *iu = irc_user_by_name(irc, cmd[i]);
648
649	if (iu) {
650	irc_send_num(irc, 302, ":%s=%c%s@%s", iu->nick,
651	irc_user_get_away(iu) ? '-' : '+',
652	iu->user, iu->host);
653	}
654	}
655	}
656
657	static void irc_cmd_ison(irc_t irc, char *cmd)
658	{
659	char buff[IRC_MAX_LINE];
660	int lenleft, i;
661
662	buff[0] = '\0';
663
664	/* [SH] Leave room for : and \0 */
665	lenleft = IRC_MAX_LINE - 2;
666
667	for (i = 1; cmd[i]; i++) {
668	char this, next;
669
670	this = cmd[i];
671	while (*this) {
672	irc_user_t *iu;
673
674	if ((next = strchr(this, ' '))) {
675	*next = 0;
676	}
677
678	if ((iu = irc_user_by_name(irc, this)) &&
679	iu->bu && iu->bu->flags & BEE_USER_ONLINE) {
680	lenleft -= strlen(iu->nick) + 1;
681
682	if (lenleft < 0) {
683	break;
684	}
685
686	strcat(buff, iu->nick);
687	strcat(buff, " ");
688	}
689
690	if (next) {
691	*next = ' ';
692	this = next + 1;
693	} else {
694	break;
695	}
696	}
697
698	/* sigh */
699	if (lenleft < 0) {
700	break;
701	}
702	}
703
704	if (strlen(buff) > 0) {
705	buff[strlen(buff) - 1] = '\0';
706	}
707
708	irc_send_num(irc, 303, ":%s", buff);
709	}
710
711	static void irc_cmd_watch(irc_t irc, char *cmd)
712	{
713	int i;
714
715	/* Obviously we could also mark a user structure as being
716	watched, but what if the WATCH command is sent right
717	after connecting? The user won't exist yet then... */
718	for (i = 1; cmd[i]; i++) {
719	char *nick;
720	irc_user_t *iu;
721
722	if (!cmd[i][0] \|\| !cmd[i][1]) {
723	break;
724	}
725
726	nick = g_strdup(cmd[i] + 1);
727	nick_lc(irc, nick);
728
729	iu = irc_user_by_name(irc, nick);
730
731	if (cmd[i][0] == '+') {
732	if (!g_hash_table_lookup(irc->watches, nick)) {
733	g_hash_table_insert(irc->watches, nick, nick);
734	}
735
736	if (iu && iu->bu && iu->bu->flags & BEE_USER_ONLINE) {
737	irc_send_num(irc, 604, "%s %s %s %d :%s", iu->nick, iu->user,
738	iu->host, (int) time(NULL), "is online");
739	} else {
740	irc_send_num(irc, 605, "%s %s %s %d :%s", nick, "", "",
741	(int) time(NULL), "is offline");
742	}
743	} else if (cmd[i][0] == '-') {
744	gpointer okey, ovalue;
745
746	if (g_hash_table_lookup_extended(irc->watches, nick, &okey, &ovalue)) {
747	g_hash_table_remove(irc->watches, okey);
748	g_free(okey);
749
750	irc_send_num(irc, 602, "%s %s %s %d :%s", nick, "", "", 0, "Stopped watching");
751	}
752	}
753	}
754	}
755
756	static void irc_cmd_topic(irc_t irc, char *cmd)
757	{
758	irc_channel_t *ic = irc_channel_by_name(irc, cmd[1]);
759	const char *new = cmd[2];
760
761	if (ic == NULL) {
762	irc_send_num(irc, 403, "%s :No such channel", cmd[1]);
763	} else if (new) {
764	if (ic->f->topic == NULL) {
765	irc_send_num(irc, 482, "%s :Can't change this channel's topic", ic->name);
766	} else if (ic->f->topic(ic, new)) {
767	irc_send_topic(ic, TRUE);
768	}
769	} else {
770	irc_send_topic(ic, FALSE);
771	}
772	}
773
774	static void irc_cmd_away(irc_t irc, char *cmd)
775	{
776	if (cmd[1] && *cmd[1]) {
777	char away[strlen(cmd[1]) + 1];
778	int i, j;
779
780	/* Copy away string, but skip control chars. Mainly because
781	Jabber really doesn't like them. */
782	for (i = j = 0; cmd[1][i]; i++) {
783	if ((unsigned char) (away[j] = cmd[1][i]) >= ' ') {
784	j++;
785	}
786	}
787	away[j] = '\0';
788
789	irc_send_num(irc, 306, ":You're now away: %s", away);
790	set_setstr(&irc->b->set, "away", away);
791	} else {
792	irc_send_num(irc, 305, ":Welcome back");
793	set_setstr(&irc->b->set, "away", NULL);
794	}
795	}
796
797	static void irc_cmd_list(irc_t irc, char *cmd)
798	{
799	GSList *l;
800
801	for (l = irc->channels; l; l = l->next) {
802	irc_channel_t *ic = l->data;
803
804	irc_send_num(irc, 322, "%s %d :%s",
805	ic->name, g_slist_length(ic->users), ic->topic ? : "");
806	}
807	irc_send_num(irc, 323, ":%s", "End of /LIST");
808	}
809
810	static void irc_cmd_version(irc_t irc, char *cmd)
811	{
812	irc_send_num(irc, 351, "%s-%s. %s :",
813	PACKAGE, BITLBEE_VERSION, irc->root->host);
814	}
815
816	static void irc_cmd_completions(irc_t irc, char *cmd)
817	{
818	help_t *h;
819	set_t *s;
820	int i;
821
822	irc_send_msg_raw(irc->root, "NOTICE", irc->user->nick, "COMPLETIONS OK");
823
824	for (i = 0; root_commands[i].command; i++) {
825	irc_send_msg_f(irc->root, "NOTICE", irc->user->nick, "COMPLETIONS %s", root_commands[i].command);
826	}
827
828	for (h = global.help; h; h = h->next) {
829	irc_send_msg_f(irc->root, "NOTICE", irc->user->nick, "COMPLETIONS help %s", h->title);
830	}
831
832	for (s = irc->b->set; s; s = s->next) {
833	irc_send_msg_f(irc->root, "NOTICE", irc->user->nick, "COMPLETIONS set %s", s->key);
834	}
835
836	irc_send_msg_raw(irc->root, "NOTICE", irc->user->nick, "COMPLETIONS END");
837	}
838
839	static void irc_cmd_rehash(irc_t irc, char *cmd)
840	{
841	if (global.conf->runmode == RUNMODE_INETD) {
842	ipc_master_cmd_rehash(NULL, NULL);
843	} else {
844	ipc_to_master(cmd);
845	}
846
847	irc_send_num(irc, 382, "%s :Rehashing", global.conf_file);
848	}
849
850	static const command_t irc_commands[] = {
851	{ "cap", 1, irc_cmd_cap, 0 },
852	{ "pass", 1, irc_cmd_pass, 0 },
853	{ "proxy", 5, irc_cmd_proxy, IRC_CMD_PRE_LOGIN },
854	{ "user", 4, irc_cmd_user, IRC_CMD_PRE_LOGIN },
855	{ "nick", 1, irc_cmd_nick, 0 },
856	{ "quit", 0, irc_cmd_quit, 0 },
857	{ "ping", 0, irc_cmd_ping, 0 },
858	{ "pong", 0, irc_cmd_pong, IRC_CMD_LOGGED_IN },
859	{ "join", 1, irc_cmd_join, IRC_CMD_LOGGED_IN },
860	{ "names", 1, irc_cmd_names, IRC_CMD_LOGGED_IN },
861	{ "part", 1, irc_cmd_part, IRC_CMD_LOGGED_IN },
862	{ "whois", 1, irc_cmd_whois, IRC_CMD_LOGGED_IN },
863	{ "whowas", 1, irc_cmd_whowas, IRC_CMD_LOGGED_IN },
864	{ "motd", 0, irc_cmd_motd, IRC_CMD_LOGGED_IN },
865	{ "mode", 1, irc_cmd_mode, IRC_CMD_LOGGED_IN },
866	{ "who", 0, irc_cmd_who, IRC_CMD_LOGGED_IN },
867	{ "privmsg", 1, irc_cmd_privmsg, IRC_CMD_LOGGED_IN },
868	{ "notice", 1, irc_cmd_notice, IRC_CMD_LOGGED_IN },
869	{ "nickserv", 1, irc_cmd_nickserv, IRC_CMD_LOGGED_IN },
870	{ "ns", 1, irc_cmd_nickserv, IRC_CMD_LOGGED_IN },
871	{ "away", 0, irc_cmd_away, IRC_CMD_LOGGED_IN },
872	{ "version", 0, irc_cmd_version, IRC_CMD_LOGGED_IN },
873	{ "completions", 0, irc_cmd_completions, IRC_CMD_LOGGED_IN },
874	{ "userhost", 1, irc_cmd_userhost, IRC_CMD_LOGGED_IN },
875	{ "ison", 1, irc_cmd_ison, IRC_CMD_LOGGED_IN },
876	{ "watch", 1, irc_cmd_watch, IRC_CMD_LOGGED_IN },
877	{ "invite", 2, irc_cmd_invite, IRC_CMD_LOGGED_IN },
878	{ "kick", 2, irc_cmd_kick, IRC_CMD_LOGGED_IN },
879	{ "topic", 1, irc_cmd_topic, IRC_CMD_LOGGED_IN },
880	{ "oper", 2, irc_cmd_oper, IRC_CMD_LOGGED_IN },
881	{ "list", 0, irc_cmd_list, IRC_CMD_LOGGED_IN },
882	{ "die", 0, NULL, IRC_CMD_OPER_ONLY \| IRC_CMD_TO_MASTER },
883	{ "deaf", 0, NULL, IRC_CMD_OPER_ONLY \| IRC_CMD_TO_MASTER },
884	{ "wallops", 1, NULL, IRC_CMD_OPER_ONLY \| IRC_CMD_TO_MASTER },
885	{ "wall", 1, NULL, IRC_CMD_OPER_ONLY \| IRC_CMD_TO_MASTER },
886	{ "rehash", 0, irc_cmd_rehash, IRC_CMD_OPER_ONLY },
887	{ "restart", 0, NULL, IRC_CMD_OPER_ONLY \| IRC_CMD_TO_MASTER },
888	{ "kill", 2, NULL, IRC_CMD_OPER_ONLY \| IRC_CMD_TO_MASTER },
889	{ "authenticate", 1, irc_cmd_authenticate, 0 },
890	{ NULL }
891	};
892
893	void irc_exec(irc_t irc, char cmd[])
894	{
895	int i, n_arg;
896
897	if (!cmd[0]) {
898	return;
899	}
900
901	for (i = 0; irc_commands[i].command; i++) {
902	if (g_strcasecmp(irc_commands[i].command, cmd[0]) == 0) {
903	/* There should be no typo in the next line: */
904	for (n_arg = 0; cmd[n_arg]; n_arg++) {
905	;
906	}
907	n_arg--;
908
909	if (irc_commands[i].flags & IRC_CMD_PRE_LOGIN && irc->status & USTATUS_LOGGED_IN) {
910	irc_send_num(irc, 462, ":Only allowed before logging in");
911	} else if (irc_commands[i].flags & IRC_CMD_LOGGED_IN && !(irc->status & USTATUS_LOGGED_IN)) {
912	irc_send_num(irc, 451, ":Register first");
913	} else if (irc_commands[i].flags & IRC_CMD_OPER_ONLY && !strchr(irc->umode, 'o')) {
914	irc_send_num(irc, 481, ":Permission denied - You're not an IRC operator");
915	} else if (n_arg < irc_commands[i].required_parameters) {
916	irc_send_num(irc, 461, "%s :Need more parameters", cmd[0]);
917	} else if (irc_commands[i].flags & IRC_CMD_TO_MASTER) {
918	/* IPC doesn't make sense in inetd mode,
919	but the function will catch that. */
920	ipc_to_master(cmd);
921	} else {
922	irc_commands[i].execute(irc, cmd);
923	}
924
925	return;
926	}
927	}
928
929	if (irc->status & USTATUS_LOGGED_IN) {
930	irc_send_num(irc, 421, "%s :Unknown command", cmd[0]);
931	}
932	}

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