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source: nick.c @ 73ee390

Last change on this file since 73ee390 was eb4ad8d, checked in by Wilmer van der Gaast <wilmer@…>, at 2015-01-17T20:13:19Z
Merging random other fixes/cleanups.
Property mode set to `100644`
File size: 10.5 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., 51 Franklin St.,
23	Fifth Floor, Boston, MA 02110-1301 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++] = g_ascii_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( g_ascii_isdigit( *fmt ) )
147	{
148	len = 0;
149	/* Grab a number. */
150	while( g_ascii_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	truncate_utf8( rets, MAX_NICK_LENGTH );
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	/* We've got no more space for underscores,
255	so truncate it and replace the last three
256	chars with a random "_XX" suffix */
257	int len = truncate_utf8( nick, MAX_NICK_LENGTH - 3 );
258	nick[len] = '_';
259	g_snprintf(nick + len + 1, 3, "%2x", rand() );
260	}
261
262	if( inf_protection-- == 0 )
263	{
264	g_snprintf( nick, MAX_NICK_LENGTH + 1, "xx%x", rand() );
265
266	irc_rootmsg( irc, "Warning: Something went wrong while trying "
267	"to generate a nickname for contact %s on %s.",
268	bu->handle, bu->ic->acc->tag );
269	irc_rootmsg( irc, "This might be a bug in BitlBee, or the result "
270	"of a faulty nick_format setting. Will use %s "
271	"instead.", nick );
272
273	break;
274	}
275	}
276	}
277
278	/* Just check if there is a nickname set for this buddy or if we'd have to
279	generate one. */
280	int nick_saved( bee_user_t *bu )
281	{
282	char store_handle, found;
283
284	store_handle = clean_handle( bu->handle );
285	found = g_hash_table_lookup( bu->ic->acc->nicks, store_handle );
286	g_free( store_handle );
287
288	return found != NULL;
289	}
290
291	void nick_del( bee_user_t *bu )
292	{
293	g_hash_table_remove( bu->ic->acc->nicks, bu->handle );
294	}
295
296
297	void nick_strip( irc_t irc, char nick )
298	{
299	int len = 0;
300
301	if( irc && ( irc->status & IRC_UTF8_NICKS ) )
302	{
303	gunichar c;
304	char p = nick, n, tmp[strlen(nick)+1];
305
306	while( p && *p )
307	{
308	c = g_utf8_get_char_validated( p, -1 );
309	n = g_utf8_find_next_char( p, NULL );
310
311	if( ( c < 0x7f && !( strchr( nick_lc_chars, c ) \|\|
312	strchr( nick_uc_chars, c ) ) ) \|\|
313	!g_unichar_isgraph( c ) )
314	{
315	strcpy( tmp, n );
316	strcpy( p, tmp );
317	}
318	else
319	p = n;
320	}
321	if( p )
322	len = p - nick;
323	}
324	else
325	{
326	int i;
327
328	for( i = len = 0; nick[i] && len < MAX_NICK_LENGTH; i++ )
329	{
330	if( strchr( nick_lc_chars, nick[i] ) \|\|
331	strchr( nick_uc_chars, nick[i] ) )
332	{
333	nick[len] = nick[i];
334	len++;
335	}
336	}
337	}
338	if( g_ascii_isdigit( nick[0] ) )
339	{
340	char *orig;
341
342	/* First character of a nick can't be a digit, so insert an
343	underscore if necessary. */
344	orig = g_strdup( nick );
345	g_snprintf( nick, MAX_NICK_LENGTH, "_%s", orig );
346	g_free( orig );
347	len ++;
348	}
349	while( len <= MAX_NICK_LENGTH )
350	nick[len++] = '\0';
351	}
352
353	gboolean nick_ok( irc_t irc, const char nick )
354	{
355	const char *s;
356
357	/* Empty/long nicks are not allowed, nor numbers at [0] */
358	if( !*nick \|\| g_ascii_isdigit( nick[0] ) \|\| strlen( nick ) > MAX_NICK_LENGTH )
359	return 0;
360
361	if( irc && ( irc->status & IRC_UTF8_NICKS ) )
362	{
363	gunichar c;
364	const char p = nick, n;
365
366	while( p && *p )
367	{
368	c = g_utf8_get_char_validated( p, -1 );
369	n = g_utf8_find_next_char( p, NULL );
370
371	if( ( c < 0x7f && !( strchr( nick_lc_chars, c ) \|\|
372	strchr( nick_uc_chars, c ) ) ) \|\|
373	!g_unichar_isgraph( c ) )
374	{
375	return FALSE;
376	}
377	p = n;
378	}
379	}
380	else
381	{
382	for( s = nick; *s; s ++ )
383	if( !strchr( nick_lc_chars, s ) && !strchr( nick_uc_chars, s ) )
384	return FALSE;
385	}
386
387	return TRUE;
388	}
389
390	int nick_lc( irc_t irc, char nick )
391	{
392	static char tab[128] = { 0 };
393	int i;
394
395	if( tab['A'] == 0 )
396	for( i = 0; nick_lc_chars[i]; i ++ )
397	{
398	tab[(int)nick_uc_chars[i]] = nick_lc_chars[i];
399	tab[(int)nick_lc_chars[i]] = nick_lc_chars[i];
400	}
401
402	if( irc && ( irc->status & IRC_UTF8_NICKS ) )
403	{
404	gchar *down = g_utf8_strdown( nick, -1 );
405	if( strlen( down ) > strlen( nick ) )
406	{
407	truncate_utf8( down, strlen( nick ) );
408	}
409	strcpy( nick, down );
410	g_free( down );
411	}
412
413	for( i = 0; nick[i]; i ++ )
414	if( ((guchar)nick[i]) < 0x7f )
415	nick[i] = tab[(guchar)nick[i]];
416
417	return nick_ok( irc, nick );
418	}
419
420	int nick_cmp( irc_t irc, const char a, const char *b )
421	{
422	char aa[1024] = "", bb[1024] = "";
423
424	strncpy( aa, a, sizeof( aa ) - 1 );
425	strncpy( bb, b, sizeof( bb ) - 1 );
426	if( nick_lc( irc, aa ) && nick_lc( irc, bb ) )
427	{
428	return( strcmp( aa, bb ) );
429	}
430	else
431	{
432	return( -1 ); /* Hmm... Not a clear answer.. :-/ */
433	}
434	}

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