1 const char miscutil_rcs[] = "$Id: miscutil.c,v 1.7 2001/06/03 11:03:48 oes Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/miscutil.c,v $
6 * Purpose : zalloc, hash_string, safe_strerror, strcmpic,
7 * strncmpic, strsav, chomp, and MinGW32 strdup
9 * These are each too small to deserve their own file
10 * but don't really fit in any other file.
12 * Copyright : Written by and Copyright (C) 2001 the SourceForge
13 * IJBSWA team. http://ijbswa.sourceforge.net
15 * Based on the Internet Junkbuster originally written
16 * by and Copyright (C) 1997 Anonymous Coders and
17 * Junkbusters Corporation. http://www.junkbusters.com
19 * This program is free software; you can redistribute it
20 * and/or modify it under the terms of the GNU General
21 * Public License as published by the Free Software
22 * Foundation; either version 2 of the License, or (at
23 * your option) any later version.
25 * This program is distributed in the hope that it will
26 * be useful, but WITHOUT ANY WARRANTY; without even the
27 * implied warranty of MERCHANTABILITY or FITNESS FOR A
28 * PARTICULAR PURPOSE. See the GNU General Public
29 * License for more details.
31 * The GNU General Public License should be included with
32 * this file. If not, you can view it at
33 * http://www.gnu.org/copyleft/gpl.html
34 * or write to the Free Software Foundation, Inc., 59
35 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 * $Log: miscutil.c,v $
39 * Revision 1.7 2001/06/03 11:03:48 oes
46 * adapted to new enlist_unique arg format
50 * introduced confdir option
52 * filters.c filtrers.h
54 * extracted-CGI relevant stuff
62 * support for new cgi mechansim
66 * functions for new list type: "map"
67 * extended enlist_unique
74 * deleted const struct interceptors
82 * added struct http_response
83 * changes struct interceptors to struct cgi_dispatcher
84 * moved HTML stuff to cgi.h
93 * Revision 1.6 2001/06/01 18:14:49 jongfoster
94 * Changing the calls to strerr() to check HAVE_STRERR (which is defined
95 * in config.h if appropriate) rather than the NO_STRERR macro.
97 * Revision 1.5 2001/06/01 10:31:51 oes
98 * Added character class matching to trivimatch; renamed to simplematch
100 * Revision 1.4 2001/05/31 17:32:31 oes
102 * - Enhanced domain part globbing with infix and prefix asterisk
103 * matching and optional unanchored operation
105 * Revision 1.3 2001/05/29 23:10:09 oes
108 * - Introduced chomp()
109 * - Moved strsav() from showargs to miscutil
111 * Revision 1.2 2001/05/29 09:50:24 jongfoster
112 * Unified blocklist/imagelist/permissionslist.
113 * File format is still under discussion, but the internal changes
116 * Also modified interceptor behaviour:
117 * - We now intercept all URLs beginning with one of the following
118 * prefixes (and *only* these prefixes):
120 * * http://ijbswa.sf.net/config/
121 * * http://ijbswa.sourceforge.net/config/
122 * - New interceptors "home page" - go to http://i.j.b/ to see it.
123 * - Internal changes so that intercepted and fast redirect pages
124 * are not replaced with an image.
125 * - Interceptors now have the option to send a binary page direct
126 * to the client. (i.e. ijb-send-banner uses this)
127 * - Implemented show-url-info interceptor. (Which is why I needed
128 * the above interceptors changes - a typical URL is
129 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
130 * The previous mechanism would not have intercepted that, and
131 * if it had been intercepted then it then it would have replaced
134 * Revision 1.1.1.1 2001/05/15 13:59:00 oes
135 * Initial import of version 2.9.3 source tree
138 *********************************************************************/
149 #include "miscutil.h"
152 const char miscutil_h_rcs[] = MISCUTIL_H_VERSION;
154 /* Fix a problem with Solaris. There should be no effect on other
156 * Solaris's isspace() is a macro which uses it's argument directly
157 * as an array index. Therefore we need to make sure that high-bit
158 * characters generate +ve values, and ideally we also want to make
159 * the argument match the declared parameter type of "int".
161 #define ijb_tolower(__X) tolower((int)(unsigned char)(__X))
162 #define ijb_isspace(__X) isspace((int)(unsigned char)(__X))
164 /*********************************************************************
168 * Description : Malloc some memory and set it to '\0'.
169 * The way calloc() ought to be -acjc
172 * 1 : size = Size of memory chunk to return.
174 * Returns : Pointer to newly malloc'd memory chunk.
176 *********************************************************************/
177 void *zalloc(int size)
181 if ((ret = (void *)malloc(size)) != NULL)
183 memset(ret, 0, size);
190 /*********************************************************************
192 * Function : hash_string
194 * Description : Take a string and compute a (hopefuly) unique numeric
195 * integer value. This has several uses, but being able
196 * to "switch" a string the one of my favorites.
199 * 1 : s : string to be hashed.
201 * Returns : an unsigned long variable with the hashed value.
203 *********************************************************************/
204 unsigned long hash_string( const char* s )
206 unsigned long h = 0ul;
219 /*********************************************************************
223 * Description : For some reason (which is beyond me), gcc and WIN32
224 * don't like strdup. When a "free" is executed on a
225 * strdup'd ptr, it can at times freez up! So I just
226 * replaced it and problem was solved.
229 * 1 : s = string to duplicate
231 * Returns : Pointer to newly malloc'ed copy of the string.
233 *********************************************************************/
234 char *strdup( const char *s )
236 char * result = (char *)malloc( strlen(s)+1 );
246 #endif /* def __MINGW32__ */
250 /*********************************************************************
252 * Function : safe_strerror
254 * Description : Variant of the library routine strerror() which will
255 * work on systems without the library routine, and
256 * which should never return NULL.
259 * 1 : err = the `errno' of the last operation.
261 * Returns : An "English" string of the last `errno'. Allocated
262 * with strdup(), so caller frees. May be NULL if the
263 * system is out of memory.
265 *********************************************************************/
266 char *safe_strerror(int err)
274 #endif /* HAVE_STRERROR */
278 sprintf(buf, "(errno = %d)", err);
287 /*********************************************************************
289 * Function : strcmpic
291 * Description : Case insensitive string comparison
294 * 1 : s1 = string 1 to compare
295 * 2 : s2 = string 2 to compare
297 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
299 *********************************************************************/
300 int strcmpic(const char *s1, const char *s2)
304 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
310 return(ijb_tolower(*s1) - ijb_tolower(*s2));
315 /*********************************************************************
317 * Function : strncmpic
319 * Description : Case insensitive string comparison (upto n characters)
322 * 1 : s1 = string 1 to compare
323 * 2 : s2 = string 2 to compare
324 * 3 : n = maximum characters to compare
326 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
328 *********************************************************************/
329 int strncmpic(const char *s1, const char *s2, size_t n)
331 if (n <= 0) return(0);
335 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
344 return(ijb_tolower(*s1) - ijb_tolower(*s2));
349 /*********************************************************************
353 * Description : In-situ-eliminate all leading and trailing whitespace
357 * 1 : s : string to be chomped.
359 * Returns : chomped string
361 *********************************************************************/
362 char *chomp(char *string)
367 * strip trailing whitespace
369 p = string + strlen(string);
370 while (p > string && ijb_isspace(*(p-1)))
377 * find end of leading whitespace
380 while (*q && ijb_isspace(*q))
386 * if there was any, move the rest forwards
400 /*********************************************************************
404 * Description : Reallocate "old" and append text to it. This makes
405 * it easier to append to malloc'd strings.
408 * 1 : old = Old text that is to be extended. Will be
409 * free()d by this routine.
410 * 2 : text_to_append = Text to be appended to old.
412 * Returns : Pointer to newly malloc'ed appended string.
413 * If there is no text to append, return old. Caller
416 *********************************************************************/
417 char *strsav(char *old, const char *text_to_append)
419 int old_len, new_len;
422 if (( text_to_append == NULL) || (*text_to_append == '\0'))
429 old_len = strlen(old);
436 new_len = old_len + strlen(text_to_append) + 1;
440 if ((p = realloc(old, new_len)) == NULL)
442 log_error(LOG_LEVEL_FATAL, "realloc(%d) bytes failed!", new_len);
443 /* Never get here - LOG_LEVEL_FATAL causes program exit */
448 if ((p = (char *)malloc(new_len)) == NULL)
450 log_error(LOG_LEVEL_FATAL, "malloc(%d) bytes failed!", new_len);
451 /* Never get here - LOG_LEVEL_FATAL causes program exit */
455 strcpy(p + old_len, text_to_append);
461 /*********************************************************************
463 * Function : simplematch
465 * Description : String matching, with a (greedy) '*' wildcard that
466 * stands for zero or more arbitrary characters and
467 * character classes in [], which take both enumerations
471 * 1 : pattern = pattern for matching
472 * 2 : text = text to be matched
474 * Returns : 0 if match, else nonzero
476 *********************************************************************/
477 int simplematch(char *pattern, char *text)
486 unsigned char charmap[32];
492 /* EOF pattern but !EOF text? */
498 /* '*' in the pattern? */
502 /* The pattern ends afterwards? Speed up the return. */
508 /* Else, set wildcard mode and remember position after '*' */
513 /* Character range specification? */
516 memset(charmap, '\0', sizeof(charmap));
518 while (*++pat != ']')
524 else if (*pat == '-')
526 if ((*++pat == ']') || *pat == '\0')
530 for(i = lastchar; i <= *pat; i++)
532 charmap[i / 8] |= (1 << (i % 8));
537 charmap[*pat / 8] |= (1 << (*pat % 8));
541 } /* -END- if Character range specification */
544 /* Compare: Char match, or char range match*/
546 || ((*pat == ']') && (charmap[*txt / 8] & (1 << (*txt % 8)))) )
548 /* Sucess, go ahead */
553 /* In wildcard mode, just try again after failiure */
568 /* Cut off extra '*'s */
569 if(*pat == '*') pat++;
571 /* If this is the pattern's end, fine! */
577 /*********************************************************************
581 * Description : Duplicate the first n characters of a string that may
582 * contain '\0' characters.
585 * 1 : string = string to be duplicated
586 * 2 : n = number of bytes to duplicate
588 * Returns : pointer to copy, or NULL if failiure
590 *********************************************************************/
591 char *bindup(const char *string, int n)
595 if (NULL == (dup = (char *)malloc(n)))
601 memcpy(dup, string, n);