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source: nick.c @ 94d9511

Last change on this file since 94d9511 was 9ed0081, checked in by Wilmer van der Gaast <wilmer@…>, at 2012-11-25T18:39:11Z
Fixed one potential memory leak, and re-remembered that for GLib + valgrind you REALLY need to set G_SLICE=always-malloc. Argh!
Property mode set to `100644`
File size: 9.6 KB

Line
1	/********************************************************************\
2	* BitlBee -- An IRC to other IM-networks gateway *
3	* *
4	* Copyright 2002-2010 Wilmer van der Gaast and others *
5	\********************************************************************/
6
7	/* Some stuff to fetch, save and handle nicknames for your buddies */
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., 59 Temple Place,
23	Suite 330, Boston, MA 02111-1307 USA
24	*/
25
26	#define BITLBEE_CORE
27	#include "bitlbee.h"
28
29	/* Character maps, _lc_[x] == _uc_[x] (but uppercase), according to the RFC's.
30	With one difference, we allow dashes. These are used to do uc/lc conversions
31	and strip invalid chars. */
32	static char *nick_lc_chars = "0123456789abcdefghijklmnopqrstuvwxyz{}^`-_\|";
33	static char *nick_uc_chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ[]~`-_\\";
34
35	/* Store handles in lower case and strip spaces, because AIM is braindead. */
36	static char clean_handle( const char orig )
37	{
38	char *new = g_malloc( strlen( orig ) + 1 );
39	int i = 0;
40
41	do {
42	if (*orig != ' ')
43	new[i++] = tolower( *orig );
44	}
45	while (*(orig++));
46
47	return new;
48	}
49
50	void nick_set_raw( account_t acc, const char handle, const char *nick )
51	{
52	char store_handle, store_nick = g_malloc( MAX_NICK_LENGTH + 1 );
53
54	store_handle = clean_handle( handle );
55	store_nick[MAX_NICK_LENGTH] = '\0';
56	strncpy( store_nick, nick, MAX_NICK_LENGTH );
57	nick_strip( store_nick );
58
59	g_hash_table_replace( acc->nicks, store_handle, store_nick );
60	}
61
62	void nick_set( bee_user_t bu, const char nick )
63	{
64	nick_set_raw( bu->ic->acc, bu->handle, nick );
65	}
66
67	char nick_get( bee_user_t bu )
68	{
69	static char nick[MAX_NICK_LENGTH+1];
70	char store_handle, found_nick;
71
72	memset( nick, 0, MAX_NICK_LENGTH + 1 );
73
74	store_handle = clean_handle( bu->handle );
75	/* Find out if we stored a nick for this person already. If not, try
76	to generate a sane nick automatically. */
77	if( ( found_nick = g_hash_table_lookup( bu->ic->acc->nicks, store_handle ) ) )
78	{
79	strncpy( nick, found_nick, MAX_NICK_LENGTH );
80	}
81	else if( ( found_nick = nick_gen( bu ) ) )
82	{
83	strncpy( nick, found_nick, MAX_NICK_LENGTH );
84	g_free( found_nick );
85	}
86	else
87	{
88	/* Keep this fallback since nick_gen() can return NULL in some cases. */
89	char *s;
90
91	g_snprintf( nick, MAX_NICK_LENGTH, "%s", bu->handle );
92	if( ( s = strchr( nick, '@' ) ) )
93	while( *s )
94	*(s++) = 0;
95
96	nick_strip( nick );
97	if( set_getbool( &bu->bee->set, "lcnicks" ) )
98	nick_lc( nick );
99	}
100	g_free( store_handle );
101
102	/* Make sure the nick doesn't collide with an existing one by adding
103	underscores and that kind of stuff, if necessary. */
104	nick_dedupe( bu, nick );
105
106	return nick;
107	}
108
109	char nick_gen( bee_user_t bu )
110	{
111	gboolean ok = FALSE; /* Set to true once the nick contains something unique. */
112	GString *ret = g_string_new( "" );
113	char *fmt = set_getstr( &bu->ic->acc->set, "nick_format" ) ? :
114	set_getstr( &bu->bee->set, "nick_format" );
115
116	while( fmt && *fmt && ret->len < MAX_NICK_LENGTH )
117	{
118	char part = NULL, chop = '\0', asc = NULL;
119	int len = MAX_NICK_LENGTH;
120
121	if( *fmt != '%' )
122	{
123	g_string_append_c( ret, *fmt );
124	fmt ++;
125	continue;
126	}
127
128	fmt ++;
129	while( *fmt )
130	{
131	/* -char means chop off everything from char */
132	if( *fmt == '-' )
133	{
134	chop = fmt[1];
135	if( chop == '\0' )
136	{
137	g_string_free( ret, TRUE );
138	return NULL;
139	}
140	fmt += 2;
141	}
142	else if( isdigit( *fmt ) )
143	{
144	len = 0;
145	/* Grab a number. */
146	while( isdigit( *fmt ) )
147	len = len * 10 + ( *(fmt++) - '0' );
148	}
149	else if( g_strncasecmp( fmt, "nick", 4 ) == 0 )
150	{
151	part = bu->nick ? : bu->handle;
152	fmt += 4;
153	ok \|= TRUE;
154	break;
155	}
156	else if( g_strncasecmp( fmt, "handle", 6 ) == 0 )
157	{
158	part = bu->handle;
159	fmt += 6;
160	ok \|= TRUE;
161	break;
162	}
163	else if( g_strncasecmp( fmt, "full_name", 9 ) == 0 )
164	{
165	part = bu->fullname;
166	fmt += 9;
167	ok \|= part && *part;
168	break;
169	}
170	else if( g_strncasecmp( fmt, "first_name", 10 ) == 0 )
171	{
172	part = bu->fullname;
173	fmt += 10;
174	ok \|= part && *part;
175	chop = ' ';
176	break;
177	}
178	else if( g_strncasecmp( fmt, "group", 5 ) == 0 )
179	{
180	part = bu->group ? bu->group->name : NULL;
181	fmt += 5;
182	break;
183	}
184	else if( g_strncasecmp( fmt, "account", 7 ) == 0 )
185	{
186	part = bu->ic->acc->tag;
187	fmt += 7;
188	break;
189	}
190	else
191	{
192	g_string_free( ret, TRUE );
193	return NULL;
194	}
195	}
196
197	/* Credits to Josay_ in #bitlbee for this idea. //TRANSLIT
198	should do lossy/approximate conversions, so letters with
199	accents don't just get stripped. Note that it depends on
200	LC_CTYPE being set to something other than C/POSIX. */
201	if( part )
202	part = asc = g_convert_with_fallback( part, -1, "ASCII//TRANSLIT",
203	"UTF-8", "", NULL, NULL, NULL );
204
205	if( ret->len == 0 && part && isdigit( *part ) )
206	g_string_append_c( ret, '_' );
207
208	while( part && part && part != chop && len > 0 )
209	{
210	if( strchr( nick_lc_chars, *part ) \|\|
211	strchr( nick_uc_chars, *part ) )
212	g_string_append_c( ret, *part );
213
214	part ++;
215	len --;
216	}
217	g_free( asc );
218	}
219
220	/* This returns NULL if the nick is empty or otherwise not ok. */
221	return g_string_free( ret, ret->len == 0 \|\| !ok );
222	}
223
224	void nick_dedupe( bee_user_t *bu, char nick[MAX_NICK_LENGTH+1] )
225	{
226	irc_t irc = (irc_t) bu->bee->ui_data;
227	int inf_protection = 256;
228	irc_user_t *iu;
229
230	/* Now, find out if the nick is already in use at the moment, and make
231	subtle changes to make it unique. */
232	while( !nick_ok( nick ) \|\|
233	( ( iu = irc_user_by_name( irc, nick ) ) && iu->bu != bu ) )
234	{
235	if( strlen( nick ) < ( MAX_NICK_LENGTH - 1 ) )
236	{
237	nick[strlen(nick)+1] = 0;
238	nick[strlen(nick)] = '_';
239	}
240	else
241	{
242	nick[0] ++;
243	}
244
245	if( inf_protection-- == 0 )
246	{
247	int i;
248
249	irc_rootmsg( irc, "Warning: Almost had an infinite loop in nick_get()! "
250	"This used to be a fatal BitlBee bug, but we tried to fix it. "
251	"This message should never appear anymore. "
252	"If it does, please do send us a bug report! "
253	"Please send all the following lines in your report:" );
254
255	irc_rootmsg( irc, "Trying to get a sane nick for handle %s", bu->handle );
256	for( i = 0; i < MAX_NICK_LENGTH; i ++ )
257	irc_rootmsg( irc, "Char %d: %c/%d", i, nick[i], nick[i] );
258
259	irc_rootmsg( irc, "FAILED. Returning an insane nick now. Things might break. "
260	"Good luck, and please don't forget to paste the lines up here "
261	"in #bitlbee on OFTC or in a mail to wilmer@gaast.net" );
262
263	g_snprintf( nick, MAX_NICK_LENGTH + 1, "xx%x", rand() );
264
265	break;
266	}
267	}
268	}
269
270	/* Just check if there is a nickname set for this buddy or if we'd have to
271	generate one. */
272	int nick_saved( bee_user_t *bu )
273	{
274	char store_handle, found;
275
276	store_handle = clean_handle( bu->handle );
277	found = g_hash_table_lookup( bu->ic->acc->nicks, store_handle );
278	g_free( store_handle );
279
280	return found != NULL;
281	}
282
283	void nick_del( bee_user_t *bu )
284	{
285	g_hash_table_remove( bu->ic->acc->nicks, bu->handle );
286	}
287
288
289	void nick_strip( char *nick )
290	{
291	int i, j;
292
293	for( i = j = 0; nick[i] && j < MAX_NICK_LENGTH; i++ )
294	{
295	if( strchr( nick_lc_chars, nick[i] ) \|\|
296	strchr( nick_uc_chars, nick[i] ) )
297	{
298	nick[j] = nick[i];
299	j++;
300	}
301	}
302	if( isdigit( nick[0] ) )
303	{
304	char *orig;
305
306	orig = g_strdup( nick );
307	g_snprintf( nick, MAX_NICK_LENGTH, "_%s", orig );
308	g_free( orig );
309	j ++;
310	}
311	while( j <= MAX_NICK_LENGTH )
312	nick[j++] = '\0';
313	}
314
315	int nick_ok( const char *nick )
316	{
317	const char *s;
318
319	/* Empty/long nicks are not allowed, nor numbers at [0] */
320	if( !*nick \|\| isdigit( nick[0] ) \|\| strlen( nick ) > MAX_NICK_LENGTH )
321	return( 0 );
322
323	for( s = nick; *s; s ++ )
324	if( !strchr( nick_lc_chars, s ) && !strchr( nick_uc_chars, s ) )
325	return( 0 );
326
327	return( 1 );
328	}
329
330	int nick_lc( char *nick )
331	{
332	static char tab[128] = { 0 };
333	int i;
334
335	if( tab['A'] == 0 )
336	for( i = 0; nick_lc_chars[i]; i ++ )
337	{
338	tab[(int)nick_uc_chars[i]] = nick_lc_chars[i];
339	tab[(int)nick_lc_chars[i]] = nick_lc_chars[i];
340	}
341
342	for( i = 0; nick[i]; i ++ )
343	{
344	if( !tab[(int)nick[i]] )
345	return( 0 );
346
347	nick[i] = tab[(int)nick[i]];
348	}
349
350	return( 1 );
351	}
352
353	int nick_uc( char *nick )
354	{
355	static char tab[128] = { 0 };
356	int i;
357
358	if( tab['A'] == 0 )
359	for( i = 0; nick_lc_chars[i]; i ++ )
360	{
361	tab[(int)nick_uc_chars[i]] = nick_uc_chars[i];
362	tab[(int)nick_lc_chars[i]] = nick_uc_chars[i];
363	}
364
365	for( i = 0; nick[i]; i ++ )
366	{
367	if( !tab[(int)nick[i]] )
368	return( 0 );
369
370	nick[i] = tab[(int)nick[i]];
371	}
372
373	return( 1 );
374	}
375
376	int nick_cmp( const char a, const char b )
377	{
378	char aa[1024] = "", bb[1024] = "";
379
380	strncpy( aa, a, sizeof( aa ) - 1 );
381	strncpy( bb, b, sizeof( bb ) - 1 );
382	if( nick_lc( aa ) && nick_lc( bb ) )
383	{
384	return( strcmp( aa, bb ) );
385	}
386	else
387	{
388	return( -1 ); /* Hmm... Not a clear answer.. :-/ */
389	}
390	}
391
392	char nick_dup( const char nick )
393	{
394	return g_strndup( nick, MAX_NICK_LENGTH );
395	}

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