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root/svn/ircd-hybrid-7.2/src/irc_string.c
Revision: 176
Committed: Sat Oct 22 00:00:13 2005 UTC (18 years, 5 months ago) by michael
Content type: text/x-csrc
File size: 15087 byte(s)
Log Message:
- Fixed gcc4 related compilewarnings in inet_ntop6().  Reported by ThaPrince

File Contents

# Content
1 /*
2 * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3 * irc_string.c: IRC string functions.
4 *
5 * Copyright (C) 2002 by the past and present ircd coders, and others.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 * USA
21 *
22 * $Id$
23 */
24
25 #include "stdinc.h"
26 #include "tools.h"
27 #include "pcre.h"
28 #include "irc_string.h"
29 #include "sprintf_irc.h"
30 #include "client.h"
31 #include "list.h"
32 #include "memory.h"
33
34 #ifndef INADDRSZ
35 #define INADDRSZ 4
36 #endif
37
38 #ifndef IN6ADDRSZ
39 #define IN6ADDRSZ 16
40 #endif
41
42 #ifndef INT16SZ
43 #define INT16SZ 2
44 #endif
45
46
47 char *
48 xstrldup(const char *s, size_t n)
49 {
50 size_t len = strlen(s) + 1;
51 char *p = NULL;
52
53 if (len > n)
54 len = n;
55 return strlcpy((p = malloc(len)), s, len), p;
56 }
57
58 /*
59 * myctime - This is like standard ctime()-function, but it zaps away
60 * the newline from the end of that string. Also, it takes
61 * the time value as parameter, instead of pointer to it.
62 * Note that it is necessary to copy the string to alternate
63 * buffer (who knows how ctime() implements it, maybe it statically
64 * has newline there and never 'refreshes' it -- zapping that
65 * might break things in other places...)
66 *
67 *
68 * Thu Nov 24 18:22:48 1986
69 */
70 const char *
71 myctime(time_t value)
72 {
73 static char buf[32];
74 char *p;
75
76 strcpy(buf, ctime(&value));
77
78 if ((p = strchr(buf, '\n')) != NULL)
79 *p = '\0';
80 return buf;
81 }
82
83 /*
84 * clean_string - clean up a string possibly containing garbage
85 *
86 * *sigh* Before the kiddies find this new and exciting way of
87 * annoying opers, lets clean up what is sent to local opers
88 * -Dianora
89 */
90 char *
91 clean_string(char* dest, const unsigned char* src, size_t len)
92 {
93 char* d = dest;
94 assert(0 != dest);
95 assert(0 != src);
96
97 if(dest == NULL || src == NULL)
98 return NULL;
99
100 len -= 3; /* allow for worst case, '^A\0' */
101
102 while (*src && (len > 0))
103 {
104 if (*src & 0x80) /* if high bit is set */
105 {
106 *d++ = '.';
107 --len;
108 }
109 else if (!IsPrint(*src)) /* if NOT printable */
110 {
111 *d++ = '^';
112 --len;
113 *d++ = 0x40 + *src; /* turn it into a printable */
114 }
115 else
116 *d++ = *src;
117 ++src, --len;
118 }
119 *d = '\0';
120 return dest;
121 }
122
123 /*
124 * strip_tabs(dst, src, length)
125 *
126 * Copies src to dst, while converting all \t (tabs) into spaces.
127 */
128 void
129 strip_tabs(char *dest, const char *src, size_t len)
130 {
131 char *d = dest;
132
133 /* Sanity check; we don't want anything nasty... */
134 assert(dest != NULL);
135 assert(src != NULL);
136 assert(len > 0);
137
138 for (; --len && *src; ++src)
139 *d++ = *src == '\t' ? ' ' : *src;
140
141 *d = '\0'; /* NUL terminate, thanks and goodbye */
142 }
143
144 /*
145 * strtoken - walk through a string of tokens, using a set of separators
146 * argv 9/90
147 *
148 */
149 #ifndef HAVE_STRTOK_R
150
151 char *
152 strtoken(char** save, char* str, const char* fs)
153 {
154 char* pos = *save; /* keep last position across calls */
155 char* tmp;
156
157 if (str)
158 pos = str; /* new string scan */
159
160 while (pos && *pos && strchr(fs, *pos) != NULL)
161 ++pos; /* skip leading separators */
162
163 if (!pos || !*pos)
164 return (pos = *save = NULL); /* string contains only sep's */
165
166 tmp = pos; /* now, keep position of the token */
167
168 while (*pos && strchr(fs, *pos) == NULL)
169 ++pos; /* skip content of the token */
170
171 if (*pos)
172 *pos++ = '\0'; /* remove first sep after the token */
173 else
174 pos = NULL; /* end of string */
175
176 *save = pos;
177 return tmp;
178 }
179
180 #endif /* !HAVE_STRTOK_R */
181
182 /*
183 * From: Thomas Helvey <tomh@inxpress.net>
184 */
185 static const char *IpQuadTab[] =
186 {
187 "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
188 "10", "11", "12", "13", "14", "15", "16", "17", "18", "19",
189 "20", "21", "22", "23", "24", "25", "26", "27", "28", "29",
190 "30", "31", "32", "33", "34", "35", "36", "37", "38", "39",
191 "40", "41", "42", "43", "44", "45", "46", "47", "48", "49",
192 "50", "51", "52", "53", "54", "55", "56", "57", "58", "59",
193 "60", "61", "62", "63", "64", "65", "66", "67", "68", "69",
194 "70", "71", "72", "73", "74", "75", "76", "77", "78", "79",
195 "80", "81", "82", "83", "84", "85", "86", "87", "88", "89",
196 "90", "91", "92", "93", "94", "95", "96", "97", "98", "99",
197 "100", "101", "102", "103", "104", "105", "106", "107", "108", "109",
198 "110", "111", "112", "113", "114", "115", "116", "117", "118", "119",
199 "120", "121", "122", "123", "124", "125", "126", "127", "128", "129",
200 "130", "131", "132", "133", "134", "135", "136", "137", "138", "139",
201 "140", "141", "142", "143", "144", "145", "146", "147", "148", "149",
202 "150", "151", "152", "153", "154", "155", "156", "157", "158", "159",
203 "160", "161", "162", "163", "164", "165", "166", "167", "168", "169",
204 "170", "171", "172", "173", "174", "175", "176", "177", "178", "179",
205 "180", "181", "182", "183", "184", "185", "186", "187", "188", "189",
206 "190", "191", "192", "193", "194", "195", "196", "197", "198", "199",
207 "200", "201", "202", "203", "204", "205", "206", "207", "208", "209",
208 "210", "211", "212", "213", "214", "215", "216", "217", "218", "219",
209 "220", "221", "222", "223", "224", "225", "226", "227", "228", "229",
210 "230", "231", "232", "233", "234", "235", "236", "237", "238", "239",
211 "240", "241", "242", "243", "244", "245", "246", "247", "248", "249",
212 "250", "251", "252", "253", "254", "255"
213 };
214
215 /*
216 * inetntoa - in_addr to string
217 * changed name to remove collision possibility and
218 * so behaviour is guaranteed to take a pointer arg.
219 * -avalon 23/11/92
220 * inet_ntoa -- returned the dotted notation of a given
221 * internet number
222 * argv 11/90).
223 * inet_ntoa -- its broken on some Ultrix/Dynix too. -avalon
224 */
225 const char *
226 inetntoa(const char *in)
227 {
228 static char buf[16];
229 char *bufptr = buf;
230 const unsigned char *a = (const unsigned char *)in;
231 const char *n;
232
233 n = IpQuadTab[ *a++ ];
234 while (*n)
235 *bufptr++ = *n++;
236 *bufptr++ = '.';
237 n = IpQuadTab[ *a++ ];
238 while (*n)
239 *bufptr++ = *n++;
240 *bufptr++ = '.';
241 n = IpQuadTab[ *a++ ];
242 while (*n)
243 *bufptr++ = *n++;
244 *bufptr++ = '.';
245 n = IpQuadTab[ *a ];
246 while (*n)
247 *bufptr++ = *n++;
248 *bufptr = '\0';
249 return buf;
250 }
251
252 #ifndef HAVE_BASENAME
253
254 /* basename()
255 *
256 * input - i.e. "/usr/local/ircd/modules/m_whois.so"
257 * output - i.e. "m_whois.so"
258 * side effects - this will be overwritten on subsequent calls
259 */
260 char *
261 basename(char *path)
262 {
263 char *s;
264
265 if ((s = strrchr(path, '/')) == NULL)
266 s = path;
267 else
268 s++;
269
270 return s;
271 }
272
273 #endif /* !HAVE_BASENAME */
274
275 /*
276 * Copyright (c) 1996-1999 by Internet Software Consortium.
277 *
278 * Permission to use, copy, modify, and distribute this software for any
279 * purpose with or without fee is hereby granted, provided that the above
280 * copyright notice and this permission notice appear in all copies.
281 *
282 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
283 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
284 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
285 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
286 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
287 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
288 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
289 * SOFTWARE.
290 */
291
292 #define SPRINTF(x) ((size_t)ircsprintf x)
293
294 /*
295 * WARNING: Don't even consider trying to compile this on a system where
296 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
297 */
298
299 static const char *inet_ntop4(const unsigned char *src, char *dst, unsigned int size);
300 #ifdef IPV6
301 static const char *inet_ntop6(const unsigned char *src, char *dst, unsigned int size);
302 #endif
303
304 /* const char *
305 * inet_ntop4(src, dst, size)
306 * format an IPv4 address
307 * return:
308 * `dst' (as a const)
309 * notes:
310 * (1) uses no statics
311 * (2) takes a unsigned char* not an in_addr as input
312 * author:
313 * Paul Vixie, 1996.
314 */
315 static const char *
316 inet_ntop4(const unsigned char *src, char *dst, unsigned int size)
317 {
318 if (size < 16)
319 return NULL;
320
321 return strcpy(dst, inetntoa((const char *)src));
322 }
323
324 /* const char *
325 * inet_ntop6(src, dst, size)
326 * convert IPv6 binary address into presentation (printable) format
327 * author:
328 * Paul Vixie, 1996.
329 */
330 #ifdef IPV6
331 static const char *
332 inet_ntop6(const unsigned char *src, char *dst, unsigned int size)
333 {
334 /*
335 * Note that int32_t and int16_t need only be "at least" large enough
336 * to contain a value of the specified size. On some systems, like
337 * Crays, there is no such thing as an integer variable with 16 bits.
338 * Keep this in mind if you think this function should have been coded
339 * to use pointer overlays. All the world's not a VAX.
340 */
341 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
342 struct { int base, len; } best = {0,0}, cur = {0,0};
343 unsigned int words[IN6ADDRSZ / INT16SZ];
344 int i;
345
346 /*
347 * Preprocess:
348 * Copy the input (bytewise) array into a wordwise array.
349 * Find the longest run of 0x00's in src[] for :: shorthanding.
350 */
351 memset(words, '\0', sizeof words);
352 for (i = 0; i < IN6ADDRSZ; i += 2)
353 words[i / 2] = (src[i] << 8) | src[i + 1];
354 best.base = -1;
355 cur.base = -1;
356 for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
357 if (words[i] == 0) {
358 if (cur.base == -1)
359 cur.base = i, cur.len = 1;
360 else
361 cur.len++;
362 } else {
363 if (cur.base != -1) {
364 if (best.base == -1 || cur.len > best.len)
365 best = cur;
366 cur.base = -1;
367 }
368 }
369 }
370 if (cur.base != -1) {
371 if (best.base == -1 || cur.len > best.len)
372 best = cur;
373 }
374 if (best.base != -1 && best.len < 2)
375 best.base = -1;
376
377 /*
378 * Format the result.
379 */
380 tp = tmp;
381 for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
382 /* Are we inside the best run of 0x00's? */
383 if (best.base != -1 && i >= best.base &&
384 i < (best.base + best.len)) {
385 if (i == best.base)
386 *tp++ = ':';
387 continue;
388 }
389 /* Are we following an initial run of 0x00s or any real hex? */
390 if (i != 0)
391 *tp++ = ':';
392 /* Is this address an encapsulated IPv4? */
393 if (i == 6 && best.base == 0 &&
394 (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
395 if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
396 return (NULL);
397 tp += strlen(tp);
398 break;
399 }
400 tp += SPRINTF((tp, "%x", words[i]));
401 }
402 /* Was it a trailing run of 0x00's? */
403 if (best.base != -1 && (best.base + best.len) ==
404 (IN6ADDRSZ / INT16SZ))
405 *tp++ = ':';
406 *tp++ = '\0';
407
408 /*
409 * Check for overflow, copy, and we're done.
410 */
411
412 assert (tp - tmp >= 0);
413
414 if ((unsigned int)(tp - tmp) > size) {
415 return (NULL);
416 }
417 return strcpy(dst, tmp);
418 }
419 #endif
420
421 /* char *
422 * inetntop(af, src, dst, size)
423 * convert a network format address to presentation format.
424 * return:
425 * pointer to presentation format address (`dst'), or NULL (see errno).
426 * author:
427 * Paul Vixie, 1996.
428 */
429 const char *
430 inetntop(int af, const void *src, char *dst, unsigned int size)
431 {
432 switch (af)
433 {
434 case AF_INET:
435 return inet_ntop4(src, dst, size);
436 #ifdef IPV6
437 case AF_INET6:
438 if (IN6_IS_ADDR_V4MAPPED((const struct in6_addr *)src) ||
439 IN6_IS_ADDR_V4COMPAT((const struct in6_addr *)src))
440 return inet_ntop4((unsigned char *)&((const struct in6_addr *)src)->s6_addr[12], dst, size);
441 else
442 return inet_ntop6(src, dst, size);
443 #endif
444 default:
445 return NULL;
446 }
447 /* NOTREACHED */
448 }
449
450 /*
451 * strlcat and strlcpy were ripped from openssh 2.5.1p2
452 * They had the following Copyright info:
453 *
454 *
455 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
456 * All rights reserved.
457 *
458 * Redistribution and use in source and binary forms, with or without
459 * modification, are permitted provided that the following conditions
460 * are met:
461 * 1. Redistributions of source code must retain the above copyright
462 * notice, this list of conditions and the following disclaimer.
463 * 2. Redistributions in binary form must reproduce the above copyright
464 * notice, this list of conditions and the following disclaimer in the
465 * documentation and/or other materials provided with the distribution.
466 * 3. The name of the author may not be used to endorse or promote products
467 * derived from this software without specific prior written permission.
468 *
469 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
470 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
471 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
472 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
473 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
474 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
475 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
476 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
477 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
478 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
479 */
480
481 #ifndef HAVE_STRLCAT
482 size_t
483 strlcat(char *dst, const char *src, size_t siz)
484 {
485 char *d = dst;
486 const char *s = src;
487 size_t n = siz, dlen;
488
489 while (n-- != 0 && *d != '\0')
490 d++;
491
492 dlen = d - dst;
493 n = siz - dlen;
494
495 if (n == 0)
496 return(dlen + strlen(s));
497
498 while (*s != '\0')
499 {
500 if (n != 1)
501 {
502 *d++ = *s;
503 n--;
504 }
505
506 s++;
507 }
508
509 *d = '\0';
510 return dlen + (s - src); /* count does not include NUL */
511 }
512 #endif
513
514 #ifndef HAVE_STRLCPY
515 size_t
516 strlcpy(char *dst, const char *src, size_t siz)
517 {
518 char *d = dst;
519 const char *s = src;
520 size_t n = siz;
521
522 /* Copy as many bytes as will fit */
523 if (n != 0 && --n != 0)
524 {
525 do
526 {
527 if ((*d++ = *s++) == 0)
528 break;
529 } while (--n != 0);
530 }
531
532 /* Not enough room in dst, add NUL and traverse rest of src */
533 if (n == 0)
534 {
535 if (siz != 0)
536 *d = '\0'; /* NUL-terminate dst */
537 while (*s++)
538 ;
539 }
540
541 return s - src - 1; /* count does not include NUL */
542 }
543 #endif
544
545 pcre *
546 ircd_pcre_compile(const char *pattern, const char **errptr)
547 {
548 int erroroffset = 0;
549 int options = PCRE_EXTRA;
550
551 assert(pattern);
552
553 return pcre_compile(pattern, options, errptr, &erroroffset, NULL);
554 }
555
556 int
557 ircd_pcre_exec(const pcre *code, const char *subject)
558 {
559 assert(code && subject);
560
561 return pcre_exec(code, NULL, subject, strlen(subject), 0, 0, NULL, 0) < 0;
562 }

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