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source: nick.c @ c27a923

Last change on this file since c27a923 was cce1b63, checked in by dequis <dx@…>, at 2014-02-27T23:46:35Z
Fix for null pointer in nick_gen (Ticket #1101)
Property mode set to `100644`
File size: 10.2 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	/* 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	irc_t irc = (irc_t ) acc->bee->ui_data;
54
55	store_handle = clean_handle( handle );
56	store_nick[MAX_NICK_LENGTH] = '\0';
57	strncpy( store_nick, nick, MAX_NICK_LENGTH );
58	nick_strip( irc, store_nick );
59
60	g_hash_table_replace( acc->nicks, store_handle, store_nick );
61	}
62
63	void nick_set( bee_user_t bu, const char nick )
64	{
65	nick_set_raw( bu->ic->acc, bu->handle, nick );
66	}
67
68	char nick_get( bee_user_t bu )
69	{
70	static char nick[MAX_NICK_LENGTH+1];
71	char store_handle, found_nick;
72	irc_t irc = (irc_t ) bu->bee->ui_data;
73
74	memset( nick, 0, MAX_NICK_LENGTH + 1 );
75
76	store_handle = clean_handle( bu->handle );
77	/* Find out if we stored a nick for this person already. If not, try
78	to generate a sane nick automatically. */
79	if( ( found_nick = g_hash_table_lookup( bu->ic->acc->nicks, store_handle ) ) )
80	{
81	strncpy( nick, found_nick, MAX_NICK_LENGTH );
82	}
83	else if( ( found_nick = nick_gen( bu ) ) )
84	{
85	strncpy( nick, found_nick, MAX_NICK_LENGTH );
86	g_free( found_nick );
87	}
88	else
89	{
90	/* Keep this fallback since nick_gen() can return NULL in some cases. */
91	char *s;
92
93	g_snprintf( nick, MAX_NICK_LENGTH, "%s", bu->handle );
94	if( ( s = strchr( nick, '@' ) ) )
95	while( *s )
96	*(s++) = 0;
97
98	nick_strip( irc, nick );
99	if( set_getbool( &bu->bee->set, "lcnicks" ) )
100	nick_lc( irc, nick );
101	}
102	g_free( store_handle );
103
104	/* Make sure the nick doesn't collide with an existing one by adding
105	underscores and that kind of stuff, if necessary. */
106	nick_dedupe( bu, nick );
107
108	return nick;
109	}
110
111	char nick_gen( bee_user_t bu )
112	{
113	gboolean ok = FALSE; /* Set to true once the nick contains something unique. */
114	GString *ret = g_string_sized_new( MAX_NICK_LENGTH + 1 );
115	char *rets;
116	irc_t irc = (irc_t ) bu->bee->ui_data;
117	char *fmt = set_getstr( &bu->ic->acc->set, "nick_format" ) ? :
118	set_getstr( &bu->bee->set, "nick_format" );
119
120	while( fmt && *fmt && ret->len < MAX_NICK_LENGTH )
121	{
122	char part = NULL, chop = '\0', asc = NULL, *s;
123	int len = INT_MAX;
124
125	if( *fmt != '%' )
126	{
127	g_string_append_c( ret, *fmt );
128	fmt ++;
129	continue;
130	}
131
132	fmt ++;
133	while( *fmt )
134	{
135	/* -char means chop off everything from char */
136	if( *fmt == '-' )
137	{
138	chop = fmt[1];
139	if( chop == '\0' )
140	{
141	g_string_free( ret, TRUE );
142	return NULL;
143	}
144	fmt += 2;
145	}
146	else if( isdigit( *fmt ) )
147	{
148	len = 0;
149	/* Grab a number. */
150	while( isdigit( *fmt ) )
151	len = len * 10 + ( *(fmt++) - '0' );
152	}
153	else if( g_strncasecmp( fmt, "nick", 4 ) == 0 )
154	{
155	part = bu->nick ? : bu->handle;
156	fmt += 4;
157	ok \|= TRUE;
158	break;
159	}
160	else if( g_strncasecmp( fmt, "handle", 6 ) == 0 )
161	{
162	part = bu->handle;
163	fmt += 6;
164	ok \|= TRUE;
165	break;
166	}
167	else if( g_strncasecmp( fmt, "full_name", 9 ) == 0 )
168	{
169	part = bu->fullname;
170	fmt += 9;
171	ok \|= part && *part;
172	break;
173	}
174	else if( g_strncasecmp( fmt, "first_name", 10 ) == 0 )
175	{
176	part = bu->fullname;
177	fmt += 10;
178	ok \|= part && *part;
179	chop = ' ';
180	break;
181	}
182	else if( g_strncasecmp( fmt, "group", 5 ) == 0 )
183	{
184	part = bu->group ? bu->group->name : NULL;
185	fmt += 5;
186	break;
187	}
188	else if( g_strncasecmp( fmt, "account", 7 ) == 0 )
189	{
190	part = bu->ic->acc->tag;
191	fmt += 7;
192	break;
193	}
194	else
195	{
196	g_string_free( ret, TRUE );
197	return NULL;
198	}
199	}
200
201	if( !part )
202	continue;
203
204	/* Credits to Josay_ in #bitlbee for this idea. //TRANSLIT
205	should do lossy/approximate conversions, so letters with
206	accents don't just get stripped. Note that it depends on
207	LC_CTYPE being set to something other than C/POSIX. */
208	if( !( irc && irc->status & IRC_UTF8_NICKS ) )
209	part = asc = g_convert_with_fallback( part, -1, "ASCII//TRANSLIT",
210	"UTF-8", "", NULL, NULL, NULL );
211
212	if( part && chop && ( s = strchr( part, chop ) ) )
213	len = MIN( len, s - part );
214
215	if( part )
216	{
217	if( len < INT_MAX )
218	g_string_append_len( ret, part, len );
219	else
220	g_string_append( ret, part );
221	}
222	g_free( asc );
223	}
224
225	rets = g_string_free( ret, FALSE );
226	if( ok && rets && *rets )
227	{
228	nick_strip( irc, rets );
229	rets[MAX_NICK_LENGTH] = '\0';
230	return rets;
231	}
232	g_free( rets );
233	return NULL;
234	}
235
236	void nick_dedupe( bee_user_t *bu, char nick[MAX_NICK_LENGTH+1] )
237	{
238	irc_t irc = (irc_t) bu->bee->ui_data;
239	int inf_protection = 256;
240	irc_user_t *iu;
241
242	/* Now, find out if the nick is already in use at the moment, and make
243	subtle changes to make it unique. */
244	while( !nick_ok( irc, nick ) \|\|
245	( ( iu = irc_user_by_name( irc, nick ) ) && iu->bu != bu ) )
246	{
247	if( strlen( nick ) < ( MAX_NICK_LENGTH - 1 ) )
248	{
249	nick[strlen(nick)+1] = 0;
250	nick[strlen(nick)] = '_';
251	}
252	else
253	{
254	nick[0] ++;
255	}
256
257	if( inf_protection-- == 0 )
258	{
259	g_snprintf( nick, MAX_NICK_LENGTH + 1, "xx%x", rand() );
260
261	irc_rootmsg( irc, "Warning: Something went wrong while trying "
262	"to generate a nickname for contact %s on %s.",
263	bu->handle, bu->ic->acc->tag );
264	irc_rootmsg( irc, "This might be a bug in BitlBee, or the result "
265	"of a faulty nick_format setting. Will use %s "
266	"instead.", nick );
267
268	break;
269	}
270	}
271	}
272
273	/* Just check if there is a nickname set for this buddy or if we'd have to
274	generate one. */
275	int nick_saved( bee_user_t *bu )
276	{
277	char store_handle, found;
278
279	store_handle = clean_handle( bu->handle );
280	found = g_hash_table_lookup( bu->ic->acc->nicks, store_handle );
281	g_free( store_handle );
282
283	return found != NULL;
284	}
285
286	void nick_del( bee_user_t *bu )
287	{
288	g_hash_table_remove( bu->ic->acc->nicks, bu->handle );
289	}
290
291
292	void nick_strip( irc_t irc, char nick )
293	{
294	int len = 0;
295
296	if( irc && ( irc->status & IRC_UTF8_NICKS ) )
297	{
298	gunichar c;
299	char p = nick, n, tmp[strlen(nick)+1];
300
301	while( p && *p )
302	{
303	c = g_utf8_get_char_validated( p, -1 );
304	n = g_utf8_find_next_char( p, NULL );
305
306	if( ( c < 0x7f && !( strchr( nick_lc_chars, c ) \|\|
307	strchr( nick_uc_chars, c ) ) ) \|\|
308	!g_unichar_isgraph( c ) )
309	{
310	strcpy( tmp, n );
311	strcpy( p, tmp );
312	}
313	else
314	p = n;
315	}
316	if( p )
317	len = p - nick;
318	}
319	else
320	{
321	int i;
322
323	for( i = len = 0; nick[i] && len < MAX_NICK_LENGTH; i++ )
324	{
325	if( strchr( nick_lc_chars, nick[i] ) \|\|
326	strchr( nick_uc_chars, nick[i] ) )
327	{
328	nick[len] = nick[i];
329	len++;
330	}
331	}
332	}
333	if( isdigit( nick[0] ) )
334	{
335	char *orig;
336
337	/* First character of a nick can't be a digit, so insert an
338	underscore if necessary. */
339	orig = g_strdup( nick );
340	g_snprintf( nick, MAX_NICK_LENGTH, "_%s", orig );
341	g_free( orig );
342	len ++;
343	}
344	while( len <= MAX_NICK_LENGTH )
345	nick[len++] = '\0';
346	}
347
348	gboolean nick_ok( irc_t irc, const char nick )
349	{
350	const char *s;
351
352	/* Empty/long nicks are not allowed, nor numbers at [0] */
353	if( !*nick \|\| isdigit( nick[0] ) \|\| strlen( nick ) > MAX_NICK_LENGTH )
354	return 0;
355
356	if( irc && ( irc->status & IRC_UTF8_NICKS ) )
357	{
358	gunichar c;
359	const char p = nick, n;
360
361	while( p && *p )
362	{
363	c = g_utf8_get_char_validated( p, -1 );
364	n = g_utf8_find_next_char( p, NULL );
365
366	if( ( c < 0x7f && !( strchr( nick_lc_chars, c ) \|\|
367	strchr( nick_uc_chars, c ) ) ) \|\|
368	!g_unichar_isgraph( c ) )
369	{
370	return FALSE;
371	}
372	p = n;
373	}
374	}
375	else
376	{
377	for( s = nick; *s; s ++ )
378	if( !strchr( nick_lc_chars, s ) && !strchr( nick_uc_chars, s ) )
379	return FALSE;
380	}
381
382	return TRUE;
383	}
384
385	int nick_lc( irc_t irc, char nick )
386	{
387	static char tab[128] = { 0 };
388	int i;
389
390	if( tab['A'] == 0 )
391	for( i = 0; nick_lc_chars[i]; i ++ )
392	{
393	tab[(int)nick_uc_chars[i]] = nick_lc_chars[i];
394	tab[(int)nick_lc_chars[i]] = nick_lc_chars[i];
395	}
396
397	if( irc && ( irc->status & IRC_UTF8_NICKS ) )
398	{
399	gchar *down = g_utf8_strdown( nick, -1 );
400	if( strlen( down ) > strlen( nick ) )
401	{
402	/* Well crap. Corrupt it if we have to. */
403	down[strlen(nick)] = '\0';
404	}
405	strcpy( nick, down );
406	g_free( down );
407	}
408
409	for( i = 0; nick[i]; i ++ )
410	if( nick[i] < 0x7f )
411	nick[i] = tab[(int)nick[i]];
412
413	return nick_ok( irc, nick );
414	}
415
416	int nick_cmp( irc_t irc, const char a, const char *b )
417	{
418	char aa[1024] = "", bb[1024] = "";
419
420	strncpy( aa, a, sizeof( aa ) - 1 );
421	strncpy( bb, b, sizeof( bb ) - 1 );
422	if( nick_lc( irc, aa ) && nick_lc( irc, bb ) )
423	{
424	return( strcmp( aa, bb ) );
425	}
426	else
427	{
428	return( -1 ); /* Hmm... Not a clear answer.. :-/ */
429	}
430	}

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