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source: nick.c @ 5a1b05c

Last change on this file since 5a1b05c was 9c7ef22, checked in by dequis <dx@…>, at 2016-12-26T00:31:18Z

nick_strip: accept null irc parameter

Sometimes I'm randomly reminded that we have a test suite.

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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	strncpy(nick, found_nick, MAX_NICK_LENGTH);
81	} else if ((found_nick = nick_gen(bu))) {
82	strncpy(nick, found_nick, MAX_NICK_LENGTH);
83	g_free(found_nick);
84	} else {
85	/* Keep this fallback since nick_gen() can return NULL in some cases. */
86	char *s;
87
88	g_snprintf(nick, MAX_NICK_LENGTH, "%s", bu->handle);
89	if ((s = strchr(nick, '@'))) {
90	while (*s) {
91	*(s++) = 0;
92	}
93	}
94
95	nick_strip(irc, nick);
96	if (set_getbool(&bu->bee->set, "nick_lowercase")) {
97	nick_lc(irc, nick);
98	}
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_sized_new(MAX_NICK_LENGTH + 1);
113	char *rets;
114	irc_t irc = (irc_t ) bu->bee->ui_data;
115	char *fmt = set_getstr(&bu->ic->acc->set, "nick_format") ? :
116	set_getstr(&bu->bee->set, "nick_format");
117
118	while (fmt && *fmt && ret->len < MAX_NICK_LENGTH) {
119	char part = NULL, chop = '\0', asc = NULL, *s;
120	int len = INT_MAX;
121
122	if (*fmt != '%') {
123	g_string_append_c(ret, *fmt);
124	fmt++;
125	continue;
126	}
127
128	fmt++;
129	while (*fmt) {
130	/* -char means chop off everything from char */
131	if (*fmt == '-') {
132	chop = fmt[1];
133	if (chop == '\0') {
134	g_string_free(ret, TRUE);
135	return NULL;
136	}
137	fmt += 2;
138	} else if (g_ascii_isdigit(*fmt)) {
139	len = 0;
140	/* Grab a number. */
141	while (g_ascii_isdigit(*fmt)) {
142	len = len * 10 + (*(fmt++) - '0');
143	}
144	} else if (g_strncasecmp(fmt, "nick", 4) == 0) {
145	part = bu->nick ? : bu->handle;
146	fmt += 4;
147	ok \|= TRUE;
148	break;
149	} else if (g_strncasecmp(fmt, "handle", 6) == 0) {
150	part = bu->handle;
151	fmt += 6;
152	ok \|= TRUE;
153	break;
154	} else if (g_strncasecmp(fmt, "full_name", 9) == 0) {
155	part = bu->fullname;
156	fmt += 9;
157	ok \|= part && *part;
158	break;
159	} else if (g_strncasecmp(fmt, "first_name", 10) == 0) {
160	part = bu->fullname;
161	fmt += 10;
162	ok \|= part && *part;
163	chop = ' ';
164	break;
165	} else if (g_strncasecmp(fmt, "group", 5) == 0) {
166	part = bu->group ? bu->group->name : NULL;
167	fmt += 5;
168	break;
169	} else if (g_strncasecmp(fmt, "account", 7) == 0) {
170	part = bu->ic->acc->tag;
171	fmt += 7;
172	break;
173	} else {
174	g_string_free(ret, TRUE);
175	return NULL;
176	}
177	}
178
179	if (!part) {
180	continue;
181	}
182
183	/* Credits to Josay_ in #bitlbee for this idea. //TRANSLIT
184	should do lossy/approximate conversions, so letters with
185	accents don't just get stripped. Note that it depends on
186	LC_CTYPE being set to something other than C/POSIX. */
187	if (!(irc && irc->status & IRC_UTF8_NICKS)) {
188	asc = g_convert_with_fallback(part, -1, "ASCII//TRANSLIT", "UTF-8", "", NULL, NULL, NULL);
189
190	if (!asc) {
191	/* If above failed, try again without //TRANSLIT.
192	//TRANSLIT is a GNU iconv special and is not POSIX.
193	Other platforms may not support it. */
194	asc = g_convert_with_fallback(part, -1, "ASCII", "UTF-8", "", NULL, NULL, NULL);
195	}
196
197	part = asc;
198	}
199
200	if (part && chop && (s = strchr(part, chop))) {
201	len = MIN(len, s - part);
202	}
203
204	if (part) {
205	if (len < INT_MAX) {
206	g_string_append_len(ret, part, len);
207	} else {
208	g_string_append(ret, part);
209	}
210	}
211	g_free(asc);
212	}
213
214	rets = g_string_free(ret, FALSE);
215	if (ok && rets && *rets) {
216	nick_strip(irc, rets);
217
218	if (set_getbool(&bu->bee->set, "nick_lowercase")) {
219	nick_lc(irc, rets);
220	}
221
222	truncate_utf8(rets, MAX_NICK_LENGTH);
223	return rets;
224	}
225	g_free(rets);
226	return NULL;
227	}
228
229	/* Used for nicks and channel names too! */
230	void underscore_dedupe(char nick[MAX_NICK_LENGTH + 1])
231	{
232	if (strlen(nick) < (MAX_NICK_LENGTH - 1)) {
233	nick[strlen(nick) + 1] = 0;
234	nick[strlen(nick)] = '_';
235	} else {
236	/* We've got no more space for underscores,
237	so truncate it and replace the last three
238	chars with a random "_XX" suffix */
239	int len = truncate_utf8(nick, MAX_NICK_LENGTH - 3);
240	nick[len] = '_';
241	g_snprintf(nick + len + 1, 3, "%2x", rand());
242	}
243	}
244
245	void nick_dedupe(bee_user_t *bu, char nick[MAX_NICK_LENGTH + 1])
246	{
247	irc_t irc = (irc_t ) bu->bee->ui_data;
248	int inf_protection = 256;
249	irc_user_t *iu;
250
251	/* Now, find out if the nick is already in use at the moment, and make
252	subtle changes to make it unique. */
253	while (!nick_ok(irc, nick) \|\|
254	((iu = irc_user_by_name(irc, nick)) && iu->bu != bu)) {
255
256	underscore_dedupe(nick);
257
258	if (inf_protection-- == 0) {
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	gboolean nick_underscores = irc ? set_getbool(&irc->b->set, "nick_underscores") : FALSE;
296
297	if (irc && (irc->status & IRC_UTF8_NICKS)) {
298	gunichar c;
299	char p = nick, n, tmp[strlen(nick) + 1];
300
301	while (p && *p) {
302	c = g_utf8_get_char_validated(p, -1);
303	n = g_utf8_find_next_char(p, NULL);
304
305	if (nick_underscores && c == ' ') {
306	*p = '_';
307	p = n;
308	} else if ((c < 0x7f && !(strchr(nick_lc_chars, c) \|\|
309	strchr(nick_uc_chars, c))) \|\|
310	!g_unichar_isgraph(c)) {
311	strcpy(tmp, n);
312	strcpy(p, tmp);
313	} else {
314	p = n;
315	}
316	}
317	if (p) {
318	len = p - nick;
319	}
320	} else {
321	int i;
322
323	for (i = len = 0; nick[i] && len < MAX_NICK_LENGTH; i++) {
324	if (nick_underscores && nick[i] == ' ') {
325	nick[len] = '_';
326	len++;
327	} else if (strchr(nick_lc_chars, nick[i]) \|\|
328	strchr(nick_uc_chars, nick[i])) {
329	nick[len] = nick[i];
330	len++;
331	}
332	}
333	}
334	if (g_ascii_isdigit(nick[0])) {
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
349	gboolean nick_ok(irc_t irc, const char nick)
350	{
351	const char *s;
352
353	/* Empty/long nicks are not allowed, nor numbers at [0] */
354	if (!*nick \|\| g_ascii_isdigit(nick[0]) \|\| strlen(nick) > MAX_NICK_LENGTH) {
355	return 0;
356	}
357
358	if (irc && (irc->status & IRC_UTF8_NICKS)) {
359	gunichar c;
360	const char p = nick, n;
361
362	while (p && *p) {
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	return FALSE;
370	}
371	p = n;
372	}
373	} else {
374	for (s = nick; *s; s++) {
375	if (!strchr(nick_lc_chars, s) && !strchr(nick_uc_chars, s)) {
376	return FALSE;
377	}
378	}
379	}
380
381	return TRUE;
382	}
383
384	int nick_lc(irc_t irc, char nick)
385	{
386	static char tab[128] = { 0 };
387	int i;
388
389	if (tab['A'] == 0) {
390	/* initialize table so nonchars are mapped to themselves */
391	for (i = 0; i < sizeof(tab); i++) {
392	tab[i] = i;
393	}
394	/* replace uppercase chars with lowercase chars */
395	for (i = 0; nick_lc_chars[i]; i++) {
396	tab[(int) nick_uc_chars[i]] = nick_lc_chars[i];
397	}
398	}
399
400	if (irc && (irc->status & IRC_UTF8_NICKS)) {
401	gchar *down = g_utf8_strdown(nick, -1);
402	if (strlen(down) > strlen(nick)) {
403	truncate_utf8(down, strlen(nick));
404	}
405	strcpy(nick, down);
406	g_free(down);
407	}
408
409	for (i = 0; nick[i]; i++) {
410	if (((guchar) nick[i]) < 0x7f) {
411	nick[i] = tab[(guchar) nick[i]];
412	}
413	}
414
415	return nick_ok(irc, nick);
416	}
417
418	int nick_cmp(irc_t irc, const char a, const char *b)
419	{
420	char aa[1024] = "", bb[1024] = "";
421
422	strncpy(aa, a, sizeof(aa) - 1);
423	strncpy(bb, b, sizeof(bb) - 1);
424	if (nick_lc(irc, aa) && nick_lc(irc, bb)) {
425	return(strcmp(aa, bb));
426	} else {
427	return(-1); /* Hmm... Not a clear answer.. :-/ */
428	}
429	}

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