1 const char miscutil_rcs[] = "$Id: miscutil.c,v 1.8 2001/06/05 22:32:01 jongfoster 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 1.8 2001/06/05 22:32:01 jongfoster
40 * New function make_path() to splice directory and file names together.
42 * Revision 1.7 2001/06/03 19:12:30 oes
45 * Revision 1.7 2001/06/03 11:03:48 oes
52 * adapted to new enlist_unique arg format
56 * introduced confdir option
58 * filters.c filtrers.h
60 * extracted-CGI relevant stuff
68 * support for new cgi mechansim
72 * functions for new list type: "map"
73 * extended enlist_unique
80 * deleted const struct interceptors
88 * added struct http_response
89 * changes struct interceptors to struct cgi_dispatcher
90 * moved HTML stuff to cgi.h
99 * Revision 1.6 2001/06/01 18:14:49 jongfoster
100 * Changing the calls to strerr() to check HAVE_STRERR (which is defined
101 * in config.h if appropriate) rather than the NO_STRERR macro.
103 * Revision 1.5 2001/06/01 10:31:51 oes
104 * Added character class matching to trivimatch; renamed to simplematch
106 * Revision 1.4 2001/05/31 17:32:31 oes
108 * - Enhanced domain part globbing with infix and prefix asterisk
109 * matching and optional unanchored operation
111 * Revision 1.3 2001/05/29 23:10:09 oes
114 * - Introduced chomp()
115 * - Moved strsav() from showargs to miscutil
117 * Revision 1.2 2001/05/29 09:50:24 jongfoster
118 * Unified blocklist/imagelist/permissionslist.
119 * File format is still under discussion, but the internal changes
122 * Also modified interceptor behaviour:
123 * - We now intercept all URLs beginning with one of the following
124 * prefixes (and *only* these prefixes):
126 * * http://ijbswa.sf.net/config/
127 * * http://ijbswa.sourceforge.net/config/
128 * - New interceptors "home page" - go to http://i.j.b/ to see it.
129 * - Internal changes so that intercepted and fast redirect pages
130 * are not replaced with an image.
131 * - Interceptors now have the option to send a binary page direct
132 * to the client. (i.e. ijb-send-banner uses this)
133 * - Implemented show-url-info interceptor. (Which is why I needed
134 * the above interceptors changes - a typical URL is
135 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
136 * The previous mechanism would not have intercepted that, and
137 * if it had been intercepted then it then it would have replaced
140 * Revision 1.1.1.1 2001/05/15 13:59:00 oes
141 * Initial import of version 2.9.3 source tree
144 *********************************************************************/
155 #include "miscutil.h"
158 const char miscutil_h_rcs[] = MISCUTIL_H_VERSION;
160 /* Fix a problem with Solaris. There should be no effect on other
162 * Solaris's isspace() is a macro which uses it's argument directly
163 * as an array index. Therefore we need to make sure that high-bit
164 * characters generate +ve values, and ideally we also want to make
165 * the argument match the declared parameter type of "int".
167 #define ijb_tolower(__X) tolower((int)(unsigned char)(__X))
168 #define ijb_isspace(__X) isspace((int)(unsigned char)(__X))
170 /*********************************************************************
174 * Description : Malloc some memory and set it to '\0'.
175 * The way calloc() ought to be -acjc
178 * 1 : size = Size of memory chunk to return.
180 * Returns : Pointer to newly malloc'd memory chunk.
182 *********************************************************************/
183 void *zalloc(int size)
187 if ((ret = (void *)malloc(size)) != NULL)
189 memset(ret, 0, size);
196 /*********************************************************************
198 * Function : hash_string
200 * Description : Take a string and compute a (hopefuly) unique numeric
201 * integer value. This has several uses, but being able
202 * to "switch" a string the one of my favorites.
205 * 1 : s : string to be hashed.
207 * Returns : an unsigned long variable with the hashed value.
209 *********************************************************************/
210 unsigned long hash_string( const char* s )
212 unsigned long h = 0ul;
225 /*********************************************************************
229 * Description : For some reason (which is beyond me), gcc and WIN32
230 * don't like strdup. When a "free" is executed on a
231 * strdup'd ptr, it can at times freez up! So I just
232 * replaced it and problem was solved.
235 * 1 : s = string to duplicate
237 * Returns : Pointer to newly malloc'ed copy of the string.
239 *********************************************************************/
240 char *strdup( const char *s )
242 char * result = (char *)malloc( strlen(s)+1 );
252 #endif /* def __MINGW32__ */
256 /*********************************************************************
258 * Function : safe_strerror
260 * Description : Variant of the library routine strerror() which will
261 * work on systems without the library routine, and
262 * which should never return NULL.
265 * 1 : err = the `errno' of the last operation.
267 * Returns : An "English" string of the last `errno'. Allocated
268 * with strdup(), so caller frees. May be NULL if the
269 * system is out of memory.
271 *********************************************************************/
272 char *safe_strerror(int err)
280 #endif /* HAVE_STRERROR */
284 sprintf(buf, "(errno = %d)", err);
293 /*********************************************************************
295 * Function : strcmpic
297 * Description : Case insensitive string comparison
300 * 1 : s1 = string 1 to compare
301 * 2 : s2 = string 2 to compare
303 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
305 *********************************************************************/
306 int strcmpic(const char *s1, const char *s2)
310 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
316 return(ijb_tolower(*s1) - ijb_tolower(*s2));
321 /*********************************************************************
323 * Function : strncmpic
325 * Description : Case insensitive string comparison (upto n characters)
328 * 1 : s1 = string 1 to compare
329 * 2 : s2 = string 2 to compare
330 * 3 : n = maximum characters to compare
332 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
334 *********************************************************************/
335 int strncmpic(const char *s1, const char *s2, size_t n)
337 if (n <= 0) return(0);
341 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
350 return(ijb_tolower(*s1) - ijb_tolower(*s2));
355 /*********************************************************************
359 * Description : In-situ-eliminate all leading and trailing whitespace
363 * 1 : s : string to be chomped.
365 * Returns : chomped string
367 *********************************************************************/
368 char *chomp(char *string)
373 * strip trailing whitespace
375 p = string + strlen(string);
376 while (p > string && ijb_isspace(*(p-1)))
383 * find end of leading whitespace
386 while (*q && ijb_isspace(*q))
392 * if there was any, move the rest forwards
406 /*********************************************************************
410 * Description : Reallocate "old" and append text to it. This makes
411 * it easier to append to malloc'd strings.
414 * 1 : old = Old text that is to be extended. Will be
415 * free()d by this routine.
416 * 2 : text_to_append = Text to be appended to old.
418 * Returns : Pointer to newly malloc'ed appended string.
419 * If there is no text to append, return old. Caller
422 *********************************************************************/
423 char *strsav(char *old, const char *text_to_append)
425 int old_len, new_len;
428 if (( text_to_append == NULL) || (*text_to_append == '\0'))
435 old_len = strlen(old);
442 new_len = old_len + strlen(text_to_append) + 1;
446 if ((p = realloc(old, new_len)) == NULL)
448 log_error(LOG_LEVEL_FATAL, "realloc(%d) bytes failed!", new_len);
449 /* Never get here - LOG_LEVEL_FATAL causes program exit */
454 if ((p = (char *)malloc(new_len)) == NULL)
456 log_error(LOG_LEVEL_FATAL, "malloc(%d) bytes failed!", new_len);
457 /* Never get here - LOG_LEVEL_FATAL causes program exit */
461 strcpy(p + old_len, text_to_append);
467 /*********************************************************************
469 * Function : simplematch
471 * Description : String matching, with a (greedy) '*' wildcard that
472 * stands for zero or more arbitrary characters and
473 * character classes in [], which take both enumerations
477 * 1 : pattern = pattern for matching
478 * 2 : text = text to be matched
480 * Returns : 0 if match, else nonzero
482 *********************************************************************/
483 int simplematch(char *pattern, char *text)
492 unsigned char charmap[32];
498 /* EOF pattern but !EOF text? */
504 /* '*' in the pattern? */
508 /* The pattern ends afterwards? Speed up the return. */
514 /* Else, set wildcard mode and remember position after '*' */
519 /* Character range specification? */
522 memset(charmap, '\0', sizeof(charmap));
524 while (*++pat != ']')
530 else if (*pat == '-')
532 if ((*++pat == ']') || *pat == '\0')
536 for(i = lastchar; i <= *pat; i++)
538 charmap[i / 8] |= (1 << (i % 8));
543 charmap[*pat / 8] |= (1 << (*pat % 8));
547 } /* -END- if Character range specification */
550 /* Compare: Char match, or char range match*/
552 || ((*pat == ']') && (charmap[*txt / 8] & (1 << (*txt % 8)))) )
554 /* Sucess, go ahead */
559 /* In wildcard mode, just try again after failiure */
574 /* Cut off extra '*'s */
575 if(*pat == '*') pat++;
577 /* If this is the pattern's end, fine! */
583 /*********************************************************************
587 * Description : Duplicate the first n characters of a string that may
588 * contain '\0' characters.
591 * 1 : string = string to be duplicated
592 * 2 : n = number of bytes to duplicate
594 * Returns : pointer to copy, or NULL if failiure
596 *********************************************************************/
597 char *bindup(const char *string, int n)
601 if (NULL == (dup = (char *)malloc(n)))
607 memcpy(dup, string, n);
615 /*********************************************************************
617 * Function : make_path
619 * Description : Takes a directory name and a file name, returns
620 * the complete path. Handles windows/unix differences.
621 * If the file name is already an absolute path, or if
622 * the directory name is NULL or empty, it returns
626 * 1 : dir: Name of directory or NULL for none.
627 * 2 : file: Name of file. Should not be NULL or empty.
629 * Returns : "dir/file" (Or on windows, "dir\file").
630 * It allocates the string on the heap. Caller frees.
631 * Returns NULL in error (i.e. NULL file or out of
634 *********************************************************************/
635 char * make_path(const char * dir, const char * file)
637 if ((file == NULL) || (*file == '\0'))
639 return NULL; /* Error */
642 if ((dir == NULL) || (*dir == '\0') /* No directory specified */
644 || (*file == '\\') || (file[1] == ':') /* Absolute path (DOS) */
645 #else /* ifndef _WIN32 */
646 || (*file == '/') /* Absolute path (U*ix) */
647 #endif /* ifndef _WIN32 */
654 char * path = malloc(strlen(dir) + strlen(file) + 2);
658 #else /* ifndef _WIN32 */
660 #endif /* ifndef _WIN32 */