summary refs log tree commit diff stats
path: root/src/common/url.c
blob: def77628c943f8408803983414741a5b3d9c41ed (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
/* X-Chat
 * Copyright (C) 1998 Peter Zelezny.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "hexchat.h"
#include "hexchatc.h"
#include "cfgfiles.h"
#include "fe.h"
#include "tree.h"
#include "url.h"
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

void *url_tree = NULL;
GTree *url_btree = NULL;
static int do_an_re (const char *word, int *start, int *end, int *type);
static GRegex *re_url (void);
static GRegex *re_host (void);
static GRegex *re_email (void);
static GRegex *re_nick (void);
static GRegex *re_channel (void);
static GRegex *re_path (void);


static int
url_free (char *url, void *data)
{
	free (url);
	return TRUE;
}

void
url_clear (void)
{
	tree_foreach (url_tree, (tree_traverse_func *)url_free, NULL);
	tree_destroy (url_tree);
	url_tree = NULL;
	g_tree_destroy (url_btree);
	url_btree = NULL;
}

static int
url_save_cb (char *url, FILE *fd)
{
	fprintf (fd, "%s\n", url);
	return TRUE;
}

void
url_save_tree (const char *fname, const char *mode, gboolean fullpath)
{
	FILE *fd;

	if (fullpath)
		fd = hexchat_fopen_file (fname, mode, XOF_FULLPATH);
	else
		fd = hexchat_fopen_file (fname, mode, 0);
	if (fd == NULL)
		return;

	tree_foreach (url_tree, (tree_traverse_func *)url_save_cb, fd);
	fclose (fd);
}

static void
url_save_node (char* url)
{
	FILE *fd;

	/* open <config>/url.log in append mode */
	fd = hexchat_fopen_file ("url.log", "a", 0);
	if (fd == NULL)
	{
		return;
	}

	fprintf (fd, "%s\n", url);
	fclose (fd);	
}

static int
url_find (char *urltext)
{
	return (g_tree_lookup_extended (url_btree, urltext, NULL, NULL));
}

static void
url_add (char *urltext, int len)
{
	char *data;
	int size;

	/* we don't need any URLs if we have neither URL grabbing nor URL logging enabled */
	if (!prefs.hex_url_grabber && !prefs.hex_url_logging)
	{
		return;
	}

	data = malloc (len + 1);
	if (!data)
	{
		return;
	}
	memcpy (data, urltext, len);
	data[len] = 0;

	if (data[len - 1] == '.')	/* chop trailing dot */
	{
		len--;
		data[len] = 0;
	}
	/* chop trailing ) but only if there's no counterpart */
	if (data[len - 1] == ')' && strchr (data, '(') == NULL)
	{
		data[len - 1] = 0;
	}

	if (prefs.hex_url_logging)
	{
		url_save_node (data);
	}

	/* the URL is saved already, only continue if we need the URL grabber too */
	if (!prefs.hex_url_grabber)
	{
		free (data);
		return;
	}

	if (!url_tree)
	{
		url_tree = tree_new ((tree_cmp_func *)strcasecmp, NULL);
		url_btree = g_tree_new ((GCompareFunc)strcasecmp);
	}

	if (url_find (data))
	{
		free (data);
		return;
	}

	size = tree_size (url_tree);
	/* 0 is unlimited */
	if (prefs.hex_url_grabber_limit > 0 && size >= prefs.hex_url_grabber_limit)
	{
		/* the loop is necessary to handle having the limit lowered while
		   HexChat is running */
		size -= prefs.hex_url_grabber_limit;
		for(; size > 0; size--)
		{
			char *pos;

			pos = tree_remove_at_pos (url_tree, 0);
			g_tree_remove (url_btree, pos);
			free (pos);
		}
	}

	tree_append (url_tree, data);
	g_tree_insert (url_btree, data, GINT_TO_POINTER (tree_size (url_tree) - 1));
	fe_url_add (data);
}

/* check if a word is clickable. This is called on mouse motion events, so
   keep it FAST! This new version was found to be almost 3x faster than
   2.4.4 release. */

static int laststart = 0;
static int lastend = 0;
static int lasttype = 0;

static int
strchrs (char c, char *s)
{
	while (*s)
		if (c == *s++)
			return TRUE;
	return FALSE;
}

#define NICKPRE "~+!@%%&"
int
url_check_word (const char *word)
{
	laststart = lastend = lasttype = 0;
	if (do_an_re (word, &laststart, &lastend, &lasttype))
	{
		switch (lasttype)
		{
			char *str;

			case WORD_NICK:
				if (strchrs (word[laststart], NICKPRE))
					laststart++;
				str = g_strndup (&word[laststart], lastend - laststart);
				if (!userlist_find (current_sess, str))
					lasttype = 0;
				g_free (str);
				return lasttype;
			case WORD_EMAIL:
				if (!isalnum (word[laststart]))
					laststart++;
				/* Fall through */
			case WORD_URL:
			case WORD_HOST:
			case WORD_CHANNEL:
			case WORD_PATH:
				return lasttype;
			default:
				return 0;	/* Should not occur */
		}
	}
	else
		return 0;
}

/* List of IRC commands for which contents (and thus possible URLs)
 * are visible to the user.  NOTE:  Trailing blank required in each. */
static char *commands[] = {
	"NOTICE ",
	"PRIVMSG ",
	"TOPIC ",
	"332 ",		/* RPL_TOPIC */
	"372 "		/* RPL_MOTD */
};

#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))

void
url_check_line (char *buf, int len)
{
	GRegex *re(void);
	GMatchInfo *gmi;
	char *po = buf;
	int i;

	/* Skip over message prefix */
	if (*po == ':')
	{
		po = strchr (po, ' ');
		if (!po)
			return;
		po++;
	}
	/* Allow only commands from the above list */
	for (i = 0; i < ARRAY_SIZE (commands); i++)
	{
		char *cmd = commands[i];
		int len = strlen (cmd);

		if (strncmp (cmd, po, len) == 0)
		{
			po += len;
			break;
		}
	}
	if (i == ARRAY_SIZE (commands))
		return;

	/* Skip past the channel name or user nick */
	po = strchr (po, ' ');
	if (!po)
		return;
	po++;

	g_regex_match(re_url(), po, 0, &gmi);
	while (g_match_info_matches(gmi))
	{
		int start, end;

		g_match_info_fetch_pos(gmi, 0, &start, &end);
		while (end > start && (po[end - 1] == '\r' || po[end - 1] == '\n'))
			end--;
		if (g_strstr_len (po + start, end - start, "://"))
			url_add(po + start, end - start);
		g_match_info_next(gmi, NULL);
	}
	g_match_info_free(gmi);
}

int
url_last (int *lstart, int *lend)
{
	*lstart = laststart;
	*lend = lastend;
	return lasttype;
}

static int
do_an_re(const char *word,int *start, int *end, int *type)
{
	typedef struct func_s {
		GRegex *(*fn)(void);
		int type;
	} func_t;
	func_t funcs[] =
	{
		{ re_url, WORD_URL },
		{ re_email, WORD_EMAIL },
		{ re_channel, WORD_CHANNEL },
		{ re_host, WORD_HOST },
		{ re_path, WORD_PATH },
		{ re_nick, WORD_NICK }
	};

	GMatchInfo *gmi;
	int k;

	for (k = 0; k < sizeof funcs / sizeof (func_t); k++)
	{
		g_regex_match (funcs[k].fn(), word, 0, &gmi);
		if (!g_match_info_matches (gmi))
		{
			g_match_info_free (gmi);
			continue;
		}
		while (g_match_info_matches (gmi))
		{
			g_match_info_fetch_pos (gmi, 0, start, end);
			g_match_info_next (gmi, NULL);
		}
		g_match_info_free (gmi);
		*type = funcs[k].type;
		return TRUE;
	}

	return FALSE;
}

/*	Miscellaneous description --- */
#define DOMAIN "[a-z0-9][-a-z0-9]*(\\.[-a-z0-9]+)*\\."
#define TLD "[a-z][-a-z0-9]*[a-z]"
#define IPADDR "[0-9]{1,3}(\\.[0-9]{1,3}){3}"
#define IPV6ADDR "([0-9a-f]{0,4}(:[0-9a-f]{0,4})*:){2}[0-9a-f]{0,4}(:[0-9a-f]{0,4})*"
#define HOST "(" DOMAIN TLD "|" IPADDR "|" IPV6ADDR ")"
#define OPT_PORT "(:[1-9][0-9]{0,4})?"

GRegex *
make_re(char *grist, char *type)
{
	GRegex *ret;
	GError *err = NULL;

	ret = g_regex_new (grist, G_REGEX_CASELESS | G_REGEX_OPTIMIZE, 0, &err);
	g_free (grist);
	return ret;
}

/*	HOST description --- */
/* (see miscellaneous above) */
static GRegex *
re_host (void)
{
	static GRegex *host_ret;
	char *grist;

	if (host_ret) return host_ret;

	grist = g_strdup_printf (
		"("	/* HOST */
			HOST OPT_PORT
		")"
	);
	host_ret = make_re (grist, "re_host");
	return host_ret;
}

/*	URL description --- */
#define SCHEME "(%s)"
#define LPAR "\\("
#define RPAR "\\)"
#define NOPARENS "[^() \t]*"
#define PATH								\
	"("								\
	   "(" LPAR NOPARENS RPAR ")"					\
	   "|"								\
	   "(" NOPARENS ")"						\
	")*"	/* Zero or more occurrences of either of these */	\
	"(?<![.,?!\\]])"	/* Not allowed to end with these */
#define USERINFO "([-a-z0-9._~%]+@)"

/* Flags used to describe URIs (RFC 3986)
 *
 * Bellow is an example of what the flags match.
 *
 * URI_AUTHORITY - http://example.org:80/foo/bar
 *                      ^^^^^^^^^^^^^^^^
 * URI_USERINFO/URI_OPT_USERINFO - http://user@example.org:80/foo/bar
 *                                        ^^^^^
 * URI_PATH - http://example.org:80/foo/bar
 *                                 ^^^^^^^^
 */
#define URI_AUTHORITY     (1 << 0)
#define URI_OPT_USERINFO  (1 << 1)
#define URI_USERINFO      (1 << 2)
#define URI_PATH          (1 << 3)

struct
{
	const char *scheme;    /* scheme name. e.g. http */
	const char *path_sep;  /* string that begins the path */
	int flags;             /* see above (flag definitions) */
} uri[] = {
	{ "irc",       "/", URI_AUTHORITY | URI_PATH },
	{ "ircs",      "/", URI_AUTHORITY | URI_PATH },
	{ "rtsp",      "/", URI_AUTHORITY | URI_PATH },
	{ "feed",      "/", URI_AUTHORITY | URI_PATH },
	{ "teamspeak", "?", URI_AUTHORITY | URI_PATH },
	{ "ftp",       "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "sftp",      "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "ftps",      "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "http",      "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "https",     "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "cvs",       "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "svn",       "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "git",       "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "rsync",     "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "mumble",    "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "ventrilo",  "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "xmpp",      "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "file",      "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "h323",      ";", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "imap",      "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "pop",       "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "nfs",       "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "smb",       "/", URI_AUTHORITY | URI_OPT_USERINFO | URI_PATH },
	{ "ssh",       "",  URI_AUTHORITY | URI_OPT_USERINFO },
	{ "sip",       "",  URI_AUTHORITY | URI_USERINFO },
	{ "sips",      "",  URI_AUTHORITY | URI_USERINFO },
	{ "magnet",    "?", URI_PATH },
	{ "mailto",    "",  URI_PATH },
	{ "bitcoin",   "",  URI_PATH },
	{ "gtalk",     "",  URI_PATH },
	{ "steam",     "",  URI_PATH },
	{ NULL, '\0', 0}
};

static GRegex *
re_url (void)
{
	static GRegex *url_ret = NULL;
	GString *grist_gstr;
	char *grist;
	int i;

	if (url_ret) return url_ret;

	grist_gstr = g_string_new (NULL);

	/* Add regex "host/path", representing a "schemeless" url */
	g_string_append (grist_gstr, "(" HOST OPT_PORT "/" "(" PATH ")?" ")");

	for (i = 0; uri[i].scheme; i++)
	{
		g_string_append (grist_gstr, "|(");
		g_string_append_printf (grist_gstr, "%s:", uri[i].scheme);

		if (uri[i].flags & URI_AUTHORITY)
			g_string_append (grist_gstr, "//");

		if (uri[i].flags & URI_USERINFO)
			g_string_append (grist_gstr, USERINFO);
		else if (uri[i].flags & URI_OPT_USERINFO)
			g_string_append (grist_gstr, USERINFO "?");

		if (uri[i].flags & URI_AUTHORITY)
			g_string_append (grist_gstr, HOST OPT_PORT);
		
		if (uri[i].flags & URI_PATH)
		{
			char *sep_escaped;
			
			sep_escaped = g_regex_escape_string (uri[i].path_sep, 
							     strlen(uri[i].path_sep));

			g_string_append_printf(grist_gstr, "(" "%s" PATH ")?",
					       sep_escaped);

			g_free(sep_escaped);
		}


		g_string_append(grist_gstr, ")");
	}

	grist = g_string_free (grist_gstr, FALSE);

	url_ret = make_re (grist, "re_url");

	return url_ret;
}

/*	EMAIL description --- */
#define EMAIL "[a-z][-_a-z0-9]+@" "(" HOST ")"

static GRegex *
re_email (void)
{
	static GRegex *email_ret;
	char *grist;

	if (email_ret) return email_ret;

	grist = g_strdup_printf (
		"("	/* EMAIL */
			EMAIL
		")"
	);
	email_ret = make_re (grist, "re_email");
	return email_ret;
}

/*	NICK description --- */
/* For NICKPRE see before url_check_word() */
#define NICKHYP	"-"
#define NICKLET "a-z"
#define NICKDIG "0-9"
/*	Note for NICKSPE:  \\\\ boils down to a single \ */
#define NICKSPE	"\\[\\]\\\\`_^{|}"
#if 0
#define NICK0 "[" NICKPRE "]?[" NICKLET NICKSPE "]"
#else
/* Allow violation of rfc 2812 by allowing digit as first char */
/* Rationale is that do_an_re() above will anyway look up what */
/* we find, and that WORD_NICK is the last item in the array */
/* that do_an_re() runs through. */
#define NICK0 "[" NICKPRE "]?[" NICKLET NICKDIG NICKSPE "]"
#endif
#define NICK1 "[" NICKHYP NICKLET NICKDIG NICKSPE "]*"
#define NICK	NICK0 NICK1

static GRegex *
re_nick (void)
{
	static GRegex *nick_ret;
	char *grist;

	if (nick_ret) return nick_ret;

	grist = g_strdup_printf (
		"("	/* NICK */
			NICK
		")"
	);
	nick_ret = make_re (grist, "re_nick");
	return nick_ret;
}

/*	CHANNEL description --- */
#define CHANNEL "#[^ \t\a,:]+"

static GRegex *
re_channel (void)
{
	static GRegex *channel_ret;
	char *grist;

	if (channel_ret) return channel_ret;

	grist = g_strdup_printf (
		"("	/* CHANNEL */
			CHANNEL
		")"
	);
	channel_ret = make_re (grist, "re_channel");
	return channel_ret;
}

/*	PATH description --- */
#ifdef WIN32
/* Windows path can be .\ ..\ or C: D: etc */
#define FS_PATH "^(\\.{1,2}\\\\|[a-z]:).*"
#else
/* Linux path can be / or ./ or ../ etc */
#define FS_PATH "^(/|\\./|\\.\\./).*"
#endif

static GRegex *
re_path (void)
{
	static GRegex *path_ret;
	char *grist;

	if (path_ret) return path_ret;

	grist = g_strdup_printf (
		"("	/* FS_PATH */
			FS_PATH
		")"
	);
	path_ret = make_re (grist, "re_path");
	return path_ret;
}