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

   1 /*
   2  * Usage: as CGI script, but called by userv
   3  * environment variables are USERV_U_E_...
   4  */
   5 /*
   6  * Copyright (C) 1998-1999,2003 Ian Jackson
   7  *
   8  * This is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with userv-utils; if not, write to the Free Software
  20  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  *
  22  * $Id$
  23  */
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <ctype.h>
  28 #include <getopt.h>
  29 #include <unistd.h>
  30 #include <sys/types.h>
  31 #include <sys/wait.h>
  32 #include <sys/stat.h>
  33
  34 #include "ucgi.h"
  35
  36 static const char *const default_envok[]= {
  37   "AUTH_TYPE",
  38   "CONTENT_LENGTH",
  39   "CONTENT_TYPE",
  40   "DOCUMENT_ROOT",
  41   "GATEWAY_INTERFACE",
  42   "HTTP_ACCEPT",
  43   "HTTP_ACCEPT_CHARSET",
  44   "HTTP_ACCEPT_ENCODING",
  45   "HTTP_ACCEPT_LANGUAGE",
  46   "HTTP_CACHE_CONTROL",
  47   "HTTP_CONNECTION",
  48   "HTTP_CONTENT_ENCODING",
  49   "HTTP_COOKIE",
  50   "HTTP_DNT",
  51   "HTTP_HOST",
  52   "HTTP_KEEP_ALIVE",
  53   "HTTP_NEGOTIATE",
  54   "HTTP_PRAGMA",
  55   "HTTP_REFERER",
  56   "HTTP_USER_AGENT",
  57   "HTTP_VIA",
  58   "HTTP_X_FORWARDED_FOR",
  59   "HTTPS",
  60   "PATH_INFO",
  61   "PATH_TRANSLATED",
  62   "QUERY_STRING",
  63   "REMOTE_ADDR",
  64   "REMOTE_HOST",
  65   "REMOTE_USER",
  66   "REMOTE_IDENT",
  67   "REQUEST_METHOD",
  68   "REQUEST_URI",
  69   "SCRIPT_FILENAME",
  70   "SCRIPT_NAME",
  71   "SCRIPT_URI",
  72   "SCRIPT_URL",
  73   "SERVER_ADDR",
  74   "SERVER_ADMIN",
  75   "SERVER_NAME",
  76   "SERVER_PORT",
  77   "SERVER_PROTOCOL",
  78   "SERVER_SIGNATURE",
  79   "SERVER_SOFTWARE",
  80   0
  81 };
  82
  83 static void setenvar(const char *fulln,
  84                      const char *en, const char *ep, void *p) {
  85   xsetenv(en, ep, 1);
  86   unsetenv(fulln);
  87 }
  88
  89 int main(int argc, char **argv) {
  90   char *scriptpath, *newvar;
  91   const char *nextslash, *lastslash, *pathi, *ev, *ev2, *scriptdir, *av;
  92   const char *const *envok;
  93   const char **arguments;
  94   size_t scriptdirlen, scriptpathlen, l;
  95   struct stat stab;
  96   int i, r, nargs;
  97   const char *filters= 0;
  98
  99   ev= getenv("USERV_U_DEBUG");
 100   if (ev && *ev) debugmode= 1;
 101
 102   D( if (debugmode) printf(";;; UCGITARGET\n"); )
 103   if (argc > MAX_ARGS) error("too many arguments");
 104
 105   for (;;) {
 106     i= getopt(argc, argv, "+e:"); if (i < 0) break;
 107     switch (i) {
 108     case 'e': filters= optarg; break;
 109     default: error("bad command line"); break;
 110     }
 111   }
 112   argc -= optind; argv += optind;
 113
 114   if (!*argv) error("no script directory argument");
 115   ev= getenv("HOME"); if (!ev) error("no HOME env. var");
 116   l= strlen(*argv)+strlen(ev);
 117   newvar= xmalloc(l+2);
 118   sprintf(newvar,"%s/%s",ev,*argv);
 119   scriptdir= newvar;
 120   scriptdirlen= strlen(scriptdir);
 121
 122   if (filters)
 123     envok= load_filters(LOADF_MUST, filters, LF_END);
 124   else {
 125     envok= load_filters(0,
 126                         ".userv/ucgitarget.env-filter",
 127                         "/etc/userv/ucgitarget.env-filter",
 128                         LF_END);
 129     if (!envok) envok= default_envok;
 130   }
 131
 132   filter_environment(0, "USERV_U_E_", envok, setenvar, 0);
 133
 134   scriptpath= 0;
 135   pathi= getenv("PATH_INFO");
 136   if (!pathi) error("PATH_INFO not found");
 137   lastslash= pathi;
 138   D( if (debugmode) {
 139        printf(";; find script name...\n"
 140               ";;   PATH_INFO = `%s'\n",
 141               pathi);
 142   } )
 143   for (;;) {
 144     if (*lastslash != '/') error("PATH_INFO expected slash not found");
 145     if (lastslash[1]=='.' || lastslash[1]=='#' || !lastslash[1]) error("bad char begin");
 146     nextslash= strchr(lastslash+1,'/');
 147     if (!nextslash) nextslash= lastslash+1+strlen(lastslash+1);
 148     if (!nextslash) error("insufficient elements in PATH_INFO");
 149     if (nextslash==lastslash+1) error("empty component in PATH_INFO");
 150     if (nextslash-pathi > MAX_SCRIPTPATH_LEN) error("PATH_INFO script path too long");
 151     scriptpathlen= scriptdirlen+(nextslash-pathi);
 152     scriptpath= xrealloc(scriptpath,scriptpathlen+1);
 153     strcpy(scriptpath,scriptdir);
 154     memcpy(scriptpath+scriptdirlen,pathi,nextslash-pathi);
 155     scriptpath[scriptpathlen]= 0;
 156     if (scriptpath[scriptpathlen-1]=='~') error("bad char end");
 157     D( if (debugmode) printf(";;   try `%s'\n", scriptpath); )
 158     r= stat(scriptpath,&stab); if (r) syserror("stat script");
 159     if (S_ISREG(stab.st_mode)) break;
 160     if (!S_ISDIR(stab.st_mode)) error("script not directory or file");
 161     lastslash= nextslash;
 162   }
 163   D( if (debugmode) printf(";;   found script: tail = `%s'\n", nextslash); )
 164   if (*nextslash) xsetenv("PATH_INFO",nextslash,1);
 165   else unsetenv("PATH_INFO");
 166
 167   newvar= xmalloc(scriptpathlen+strlen(nextslash)+3);
 168   sprintf(newvar,"%s%s",scriptpath,nextslash);
 169   xsetenv("PATH_TRANSLATED",newvar,1);
 170
 171   xsetenv("SCRIPT_FILENAME",scriptpath,1);
 172
 173   ev= getenv("SCRIPT_NAME");
 174   if (ev) {
 175     ev2= getenv("USER"); if (!ev2) error("no USER variable");
 176     newvar= xmalloc(strlen(ev)+2+strlen(ev2)+scriptpathlen-scriptdirlen+2);
 177     sprintf(newvar,"%s/~%s%s",ev,ev2,scriptpath+scriptdirlen);
 178     xsetenv("SCRIPT_NAME",newvar,1);
 179   }
 180
 181   arguments= xmalloc(sizeof(const char*)*(argc+5));
 182   nargs= 0;
 183
 184   arguments[nargs++]= scriptpath;
 185   while ((av= (*++argv))) arguments[nargs++]= av;
 186   arguments[nargs++]= 0;
 187
 188   D( if (debugmode) {
 189        int i;
 190
 191        printf(";; final environment...\n");
 192        for (i = 0; environ[i]; i++)
 193          printf(";;   %s\n", environ[i]);
 194
 195        printf(";; final command line...\n");
 196        for (i = 0; arguments[i]; i++)
 197          printf(";;   %s\n", arguments[i]);
 198        fflush(stdout);
 199   } )
 200
 201   execvp(scriptpath,(char*const*)arguments);
 202   syserror("exec script");
 203   return -1;
 204 }