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 static void *xrealloc(void *ptr, size_t sz) {
  36   void *r;
  37
  38   r= realloc(ptr,sz);
  39   if (!r) syserror("realloc failed");
  40   return r;
  41 }
  42
  43 int main(int argc, const char **argv) {
  44   char *uservarn, *scriptpath, *newvar;
  45   const char *nextslash, *lastslash, *pathi, *ev, *ev2, *en, *scriptdir, *av;
  46   const char *const *ep;
  47   const char **arguments;
  48   size_t scriptdirlen, scriptpathlen, l, uservarnl;
  49   struct stat stab;
  50   int r, nargs;
  51
  52   ev= getenv("USERV_U_DEBUG");
  53   if (ev && *ev) debugmode= 1;
  54
  55   if (argc > MAX_ARGS) error("too many arguments");
  56
  57   if (!*++argv) error("no script directory argument");
  58   ev= getenv("HOME"); if (!ev) error("no HOME env. var");
  59   l= strlen(*argv)+strlen(ev);
  60   newvar= xmalloc(l+2);
  61   sprintf(newvar,"%s/%s",ev,*argv);
  62   scriptdir= newvar;
  63   scriptdirlen= strlen(scriptdir);
  64
  65   uservarn= 0;
  66   uservarnl= 0;
  67   for (ep= envok; (en= *ep); ep++) {
  68     l= strlen(en)+11;
  69     if (uservarnl<l) { uservarn= xrealloc(uservarn,l); uservarnl= l; }
  70     sprintf(uservarn,"USERV_U_E_%s",en);
  71     ev= getenv(uservarn); if (!ev) continue;
  72     if (strlen(ev) > MAX_ENVVAR_VALUE) error("environment variable too long");
  73     if (setenv(en,ev,1)) syserror("setenv");
  74     unsetenv(uservarn);
  75   }
  76
  77   scriptpath= 0;
  78   pathi= getenv("PATH_INFO");
  79   if (!pathi) error("PATH_INFO not found");
  80   lastslash= pathi;
  81   for (;;) {
  82     if (*lastslash != '/') error("PATH_INFO expected slash not found");
  83     if (lastslash[1]=='.' || lastslash[1]=='#' || !lastslash[1]) error("bad char begin");
  84     nextslash= strchr(lastslash+1,'/');
  85     if (!nextslash) nextslash= lastslash+1+strlen(lastslash+1);
  86     if (!nextslash) error("insufficient elements in PATH_INFO");
  87     if (nextslash==lastslash+1) error("empty component in PATH_INFO");
  88     if (nextslash-pathi > MAX_SCRIPTPATH_LEN) error("PATH_INFO script path too long");
  89     scriptpathlen= scriptdirlen+(nextslash-pathi);
  90     scriptpath= xrealloc(scriptpath,scriptpathlen+1);
  91     strcpy(scriptpath,scriptdir);
  92     memcpy(scriptpath+scriptdirlen,pathi,nextslash-pathi);
  93     scriptpath[scriptpathlen]= 0;
  94     if (scriptpath[scriptpathlen-1]=='~') error("bad char end");
  95     r= stat(scriptpath,&stab); if (r) syserror("stat script");
  96     if (S_ISREG(stab.st_mode)) break;
  97     if (!S_ISDIR(stab.st_mode)) syserror("script not directory or file");
  98     lastslash= nextslash;
  99   }
 100   if (*nextslash) xsetenv("PATH_INFO",nextslash,1);
 101   else unsetenv("PATH_INFO");
 102
 103   newvar= xmalloc(scriptpathlen+strlen(nextslash)+3);
 104   sprintf(newvar,"%s%s",scriptpath,nextslash);
 105   xsetenv("PATH_TRANSLATED",newvar,1);
 106
 107   xsetenv("SCRIPT_FILENAME",scriptpath,1);
 108
 109   ev= getenv("SCRIPT_NAME");
 110   if (ev) {
 111     ev2= getenv("USER"); if (!ev2) error("no USER variable");
 112     newvar= xmalloc(strlen(ev)+2+strlen(ev2)+scriptpathlen-scriptdirlen+2);
 113     sprintf(newvar,"%s/~%s%s",ev,ev2,scriptpath+scriptdirlen);
 114     xsetenv("SCRIPT_NAME",newvar,1);
 115   }
 116
 117   arguments= xmalloc(sizeof(const char*)*(argc+5));
 118   nargs= 0;
 119
 120   arguments[nargs++]= scriptpath;
 121   while ((av= (*++argv))) arguments[nargs++]= av;
 122   arguments[nargs++]= 0;
 123
 124   execvp(scriptpath,(char*const*)arguments);
 125   syserror("exec script");
 126   return -1;
 127 }