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 <unistd.h>
  29 #include <sys/types.h>
  30 #include <sys/wait.h>
  31 #include <sys/stat.h>
  32
  33 #include "ucgi.h"
  34
  35 int main(int argc, const char **argv) {
  36   char *uservarn, *scriptpath, *newvar;
  37   const char *nextslash, *lastslash, *pathi, *ev, *ev2, *en, *scriptdir, *av;
  38   const char *const *ep;
  39   const char **arguments;
  40   size_t scriptdirlen, scriptpathlen, l, uservarnl;
  41   struct stat stab;
  42   int r, nargs;
  43
  44   ev= getenv("USERV_U_DEBUG");
  45   if (ev && *ev) debugmode= 1;
  46
  47   if (argc > MAX_ARGS) error("too many arguments");
  48
  49   if (!*++argv) error("no script directory argument");
  50   ev= getenv("HOME"); if (!ev) error("no HOME env. var");
  51   l= strlen(*argv)+strlen(ev);
  52   newvar= xmalloc(l+2);
  53   sprintf(newvar,"%s/%s",ev,*argv);
  54   scriptdir= newvar;
  55   scriptdirlen= strlen(scriptdir);
  56
  57   uservarn= 0;
  58   uservarnl= 0;
  59   for (ep= envok; (en= *ep); ep++) {
  60     l= strlen(en)+11;
  61     if (uservarnl<l) { uservarn= xrealloc(uservarn,l); uservarnl= l; }
  62     sprintf(uservarn,"USERV_U_E_%s",en);
  63     ev= getenv(uservarn); if (!ev) continue;
  64     if (strlen(ev) > MAX_ENVVAR_VALUE) error("environment variable too long");
  65     if (setenv(en,ev,1)) syserror("setenv");
  66     unsetenv(uservarn);
  67   }
  68
  69   scriptpath= 0;
  70   pathi= getenv("PATH_INFO");
  71   if (!pathi) error("PATH_INFO not found");
  72   lastslash= pathi;
  73   for (;;) {
  74     if (*lastslash != '/') error("PATH_INFO expected slash not found");
  75     if (lastslash[1]=='.' || lastslash[1]=='#' || !lastslash[1]) error("bad char begin");
  76     nextslash= strchr(lastslash+1,'/');
  77     if (!nextslash) nextslash= lastslash+1+strlen(lastslash+1);
  78     if (!nextslash) error("insufficient elements in PATH_INFO");
  79     if (nextslash==lastslash+1) error("empty component in PATH_INFO");
  80     if (nextslash-pathi > MAX_SCRIPTPATH_LEN) error("PATH_INFO script path too long");
  81     scriptpathlen= scriptdirlen+(nextslash-pathi);
  82     scriptpath= xrealloc(scriptpath,scriptpathlen+1);
  83     strcpy(scriptpath,scriptdir);
  84     memcpy(scriptpath+scriptdirlen,pathi,nextslash-pathi);
  85     scriptpath[scriptpathlen]= 0;
  86     if (scriptpath[scriptpathlen-1]=='~') error("bad char end");
  87     r= stat(scriptpath,&stab); if (r) syserror("stat script");
  88     if (S_ISREG(stab.st_mode)) break;
  89     if (!S_ISDIR(stab.st_mode)) error("script not directory or file");
  90     lastslash= nextslash;
  91   }
  92   if (*nextslash) xsetenv("PATH_INFO",nextslash,1);
  93   else unsetenv("PATH_INFO");
  94
  95   newvar= xmalloc(scriptpathlen+strlen(nextslash)+3);
  96   sprintf(newvar,"%s%s",scriptpath,nextslash);
  97   xsetenv("PATH_TRANSLATED",newvar,1);
  98
  99   xsetenv("SCRIPT_FILENAME",scriptpath,1);
 100
 101   ev= getenv("SCRIPT_NAME");
 102   if (ev) {
 103     ev2= getenv("USER"); if (!ev2) error("no USER variable");
 104     newvar= xmalloc(strlen(ev)+2+strlen(ev2)+scriptpathlen-scriptdirlen+2);
 105     sprintf(newvar,"%s/~%s%s",ev,ev2,scriptpath+scriptdirlen);
 106     xsetenv("SCRIPT_NAME",newvar,1);
 107   }
 108
 109   arguments= xmalloc(sizeof(const char*)*(argc+5));
 110   nargs= 0;
 111
 112   arguments[nargs++]= scriptpath;
 113   while ((av= (*++argv))) arguments[nargs++]= av;
 114   arguments[nargs++]= 0;
 115
 116   execvp(scriptpath,(char*const*)arguments);
 117   syserror("exec script");
 118   return -1;
 119 }