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

   1 /*
   2  * Usage: as CGI script
   3  */
   4 /*
   5  * Copyright (C) 1998-1999,2003 Ian Jackson
   6  *
   7  * This is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with userv-utils; if not, write to the Free Software
  19  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  *
  21  * $Id$
  22  */
  23
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/wait.h>
  30
  31 #include "ucgi.h"
  32
  33 int main(int argc, const char **argv) {
  34   char *defarg, *username;
  35   const char *slash2, *pathi, *ev, *en, *av;
  36   const char *const *ep;
  37   const char **arguments;
  38   size_t usernamelen, l;
  39   pid_t child, rchild;
  40   int nargs, status;
  41
  42   l= strlen(argv[0]);
  43   if (l>6 && !strcmp(argv[0]+l-6,"-debug")) debugmode= 1;
  44
  45   if (debugmode) {
  46     if (fputs("Content-Type: text/plain\n\n",stdout)==EOF || fflush(stdout))
  47       syserror("write stdout");
  48     if (dup2(1,2)<0) { perror("dup stdout to stderr"); exit(-1); }
  49   }
  50
  51   if (argc > MAX_ARGS) error("too many arguments");
  52
  53   pathi= getenv("PATH_INFO");
  54   if (!pathi) error("PATH_INFO not found");
  55   if (pathi[0] != '/' || pathi[1] != '~') error("PATH_INFO must start with /~");
  56   slash2= strchr(pathi+2,'/'); if (!slash2) error("PATH_INFO must have more than one /");
  57   usernamelen= slash2-(pathi+2);
  58   if (usernamelen > MAX_USERNAME_LEN) error("PATH_INFO username too long");
  59   username= xmalloc(usernamelen+1);
  60   memcpy(username,pathi+2,usernamelen); username[usernamelen]= 0;
  61   if (!isalpha(username[0])) error("username 1st character is not alphabetic");
  62   xsetenv("PATH_INFO",slash2,1);
  63
  64   arguments= xmalloc(sizeof(const char*)*(nenvok+argc+10));
  65   nargs= 0;
  66
  67   arguments[nargs++]= "userv";
  68   if (debugmode) arguments[nargs++]= "-DDEBUG=1";
  69
  70   for (ep= envok; (en= *ep); ep++) {
  71     ev= getenv(en); if (!ev) continue;
  72     l= strlen(ev); if (l > MAX_ENVVAR_VALUE) error("environment variable too long");
  73     defarg= xmalloc(strlen(en)+l+6);
  74     sprintf(defarg,"-DE_%s=%s",en,ev);
  75     arguments[nargs++]= defarg;
  76   }
  77
  78   arguments[nargs++]= username;
  79   arguments[nargs++]= "www-cgi";
  80   while ((av= (*++argv))) arguments[nargs++]= av;
  81   arguments[nargs++]= 0;
  82
  83   if (debugmode) {
  84     child= fork(); if (child==-1) syserror("fork");
  85     if (child) {
  86       rchild= waitpid(child,&status,0);
  87       if (rchild==-1) syserror("waitpid");
  88       printf("\nexit status %d %d\n",(status>>8)&0x0ff,status&0x0ff);
  89       exit(0);
  90     }
  91   }
  92
  93   execvp("userv",(char*const*)arguments);
  94   syserror("exec userv");
  95   return -1;
  96 }