mdw@git.distorted.org.uk Git - userv-utils/blob - www-cgi/ucgicommon.c

   1 /*
   2  * Copyright (C) 1998-1999,2003 Ian Jackson
   3  *
   4  * This is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with userv-utils; if not, write to the Free Software
  16  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  * $Id$
  19  */
  20
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <errno.h>
  24
  25 #include <unistd.h>
  26
  27 #include "ucgi.h"
  28
  29 const char *const envok[]= {
  30   "AUTH_TYPE",
  31   "CONTENT_LENGTH",
  32   "CONTENT_TYPE",
  33   "DOCUMENT_ROOT",
  34   "GATEWAY_INTERFACE",
  35   "HTTP_ACCEPT",
  36   "HTTP_ACCEPT_CHARSET",
  37   "HTTP_ACCEPT_ENCODING",
  38   "HTTP_ACCEPT_LANGUAGE",
  39   "HTTP_CACHE_CONTROL",
  40   "HTTP_CONNECTION",
  41   "HTTP_CONTENT_ENCODING",
  42   "HTTP_COOKIE",
  43   "HTTP_DNT",
  44   "HTTP_HOST",
  45   "HTTP_KEEP_ALIVE",
  46   "HTTP_NEGOTIATE",
  47   "HTTP_PRAGMA",
  48   "HTTP_REFERER",
  49   "HTTP_USER_AGENT",
  50   "HTTP_VIA",
  51   "HTTP_X_FORWARDED_FOR",
  52   "HTTPS",
  53   "PATH_INFO",
  54   "PATH_TRANSLATED",
  55   "QUERY_STRING",
  56   "REMOTE_ADDR",
  57   "REMOTE_HOST",
  58   "REMOTE_USER",
  59   "REMOTE_IDENT",
  60   "REQUEST_METHOD",
  61   "REQUEST_URI",
  62   "SCRIPT_FILENAME",
  63   "SCRIPT_NAME",
  64   "SCRIPT_URI",
  65   "SCRIPT_URL",
  66   "SERVER_ADDR",
  67   "SERVER_ADMIN",
  68   "SERVER_NAME",
  69   "SERVER_PORT",
  70   "SERVER_PROTOCOL",
  71   "SERVER_SIGNATURE",
  72   "SERVER_SOFTWARE",
  73   0
  74 };
  75 const int nenvok= sizeof(envok)/sizeof(envok[0]);
  76
  77 int debugmode= 0;
  78
  79 static void outerror(void) {
  80   perror("stdout");
  81   exit(debugmode ? 0 : -1);
  82 }
  83
  84 void syserror(const char *m) {
  85   if (printf("Content-Type: text/plain\n\n"
  86              "ucgi: system call error:\n"
  87              "%s: %s\n",
  88              m,strerror(errno))==EOF || fflush(stdout)) outerror();
  89   exit(0);
  90 }
  91
  92 void error(const char *m) {
  93   if (printf("Content-Type: text/plain\n\n"
  94              "ucgi: error:\n"
  95              "%s\n",
  96              m)==EOF || fflush(stdout)) outerror();
  97   exit(0);
  98 }
  99
 100 void *xmalloc(size_t sz) {
 101   void *r;
 102
 103   r= malloc(sz);
 104   if (!r) syserror("malloc failed");
 105   return r;
 106 }
 107
 108 void *xrealloc(void *ptr, size_t sz) {
 109   void *r;
 110
 111   r= realloc(ptr,sz);
 112   if (!r) syserror("realloc failed");
 113   return r;
 114 }
 115
 116 void xsetenv(const char *en, const char *ev, int overwrite) {
 117   if (setenv(en,ev,overwrite)) syserror("setenv");
 118 }
 119
 120 void filter_environment(unsigned flags, const char *prefix_in,
 121                         const char *const *patv,
 122                         void (*foundone)(const char *fulln,
 123                                          const char *en, const char *ev,
 124                                          void *p),
 125                         void *p)
 126 {
 127   char *const *ep;
 128   const char *const *patp;
 129   const char *en, *ev, *pat, *q;
 130   char enbuf[MAX_ENVVAR_NAME];
 131   size_t n, pn = strlen(prefix_in);
 132   int acceptp;
 133
 134   D( if (debugmode) printf(";; filter_environment...\n"); )
 135   for (ep= environ; (en= *ep); ep++) {
 136     D( if (debugmode) printf(";;   consider env-var `%s'\n", en); )
 137     if (strncmp(en, prefix_in, pn) != 0 || !en[pn]) {
 138       D( if (debugmode) printf(";;     doesn't match prefix\n"); )
 139       goto next_ev;
 140     }
 141     for (patp= patv; (pat= *patp); patp++) {
 142       q= en + pn;
 143       acceptp= 1;
 144       if (*pat == '!' && (flags & FILTF_WILDCARD)) {
 145         acceptp= 0; pat++;
 146       }
 147       for (;;) {
 148         if (!*pat) {
 149           if (*q != '=') {
 150             D( if (debugmode)
 151                  printf(";;     mismatch `%s' (prefix)\n", *patp); )
 152             goto next_pat;
 153           }
 154           D( if (debugmode) printf(";;     matched `%s'\n", *patp); )
 155           ev = q + 1;
 156           break;
 157         } else if (*pat == '*' && (flags & FILTF_WILDCARD)) {
 158           q = strchr(q, '=');
 159           if (!q) {
 160             D( if (debugmode)
 161                  printf(";;     mismatch `%s' (discard: no `=')\n", *patp); )
 162             goto next_ev;
 163           }
 164           D( if (debugmode)
 165                printf(";;     wildcard match for `%s'\n", *patp); )
 166           ev = q + 1;
 167           break;
 168         } else
 169           if (*pat++ != *q++) {
 170             D( if (debugmode) printf(";;     mismatch `%s'\n", *patp); )
 171             goto next_pat;
 172           }
 173       }
 174       if (acceptp) {
 175         n= q - en;
 176         if (n >= sizeof(enbuf))
 177           error("environment variable name too long");
 178         memcpy(enbuf, en, n);
 179         enbuf[n]= 0;
 180         D( if (debugmode)
 181              printf(";;     full = `%s'; tail = `%s'; value = `%s'\n",
 182                     enbuf, enbuf + pn, ev); )
 183         foundone(enbuf, enbuf + pn, ev, p);
 184       } D( else if (debugmode)
 185              printf(";;     matched negated pattern\n"); )
 186       goto next_ev;
 187     next_pat:;
 188     }
 189   next_ev:;
 190   }
 191 }