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 struct buildargs {
  34   const char **v;
  35   int n, max;
  36 };
  37
  38 static void addarg(struct buildargs *args, const char *a) {
  39   if (args->n > args->max) error("too many arguments");
  40   args->v[args->n++]= a;
  41 }
  42
  43 static void add_userv_var(const char *fulln,
  44                           const char *en, const char *ev, void *p) {
  45   struct buildargs *args= p;
  46   size_t l;
  47   char *a;
  48
  49   l= strlen(ev); if (l > MAX_ENVVAR_VALUE) error("environment variable too long");
  50   a= xmalloc(strlen(en)+l+6);
  51   sprintf(a,"-DE_%s=%s",en,ev);
  52   addarg(args, a);
  53 }
  54
  55 int main(int argc, const char **argv) {
  56   char *username;
  57   const char *slash2, *pathi, *av;
  58   size_t usernamelen, l;
  59   struct buildargs args;
  60   pid_t child, rchild;
  61   int status;
  62
  63   l= strlen(argv[0]);
  64   if (l>6 && !strcmp(argv[0]+l-6,"-debug")) debugmode= 1;
  65
  66   if (debugmode) {
  67     if (fputs("Content-Type: text/plain\n\n",stdout)==EOF || fflush(stdout))
  68       syserror("write stdout");
  69     if (dup2(1,2)<0) { perror("dup stdout to stderr"); exit(-1); }
  70     D( printf(";;; UCGI\n"); )
  71   }
  72
  73   if (argc > MAX_ARGS) error("too many arguments");
  74
  75   pathi= getenv("PATH_INFO");
  76   if (!pathi) error("PATH_INFO not found");
  77   D( if (debugmode) {
  78        printf(";; find user name...\n"
  79               ";;   initial PATH_INFO = `%s'\n",
  80               pathi);
  81   } )
  82   if (pathi[0] != '/' || pathi[1] != '~') error("PATH_INFO must start with /~");
  83   slash2= strchr(pathi+2,'/'); if (!slash2) error("PATH_INFO must have more than one /");
  84   usernamelen= slash2-(pathi+2);
  85   if (usernamelen > MAX_USERNAME_LEN) error("PATH_INFO username too long");
  86   username= xmalloc(usernamelen+1);
  87   memcpy(username,pathi+2,usernamelen); username[usernamelen]= 0;
  88   D( if (debugmode)
  89        printf(";;   user = `%s'; tail = `%s'\n", username, slash2); )
  90   if (!isalpha(username[0])) error("username 1st character is not alphabetic");
  91   xsetenv("PATH_INFO",slash2,1);
  92
  93   args.n= 0; args.max= argc + MAX_ENVVARS + 10;
  94   args.v= xmalloc(args.max * sizeof(*args.v));
  95
  96   addarg(&args, "userv");
  97   if (debugmode) addarg(&args, "-DDEBUG=1");
  98
  99   filter_environment(FILTF_WILDCARD, "", envok, add_userv_var, &args);
 100
 101   addarg(&args, username);
 102   addarg(&args, "www-cgi");
 103   while ((av= (*++argv))) addarg(&args, av);
 104   addarg(&args, 0);
 105
 106   if (debugmode) {
 107     D( fflush(stdout); )
 108     child= fork(); if (child==-1) syserror("fork");
 109     if (child) {
 110       rchild= waitpid(child,&status,0);
 111       if (rchild==-1) syserror("waitpid");
 112       printf("\nexit status %d %d\n",(status>>8)&0x0ff,status&0x0ff);
 113       exit(0);
 114     }
 115   }
 116
 117   D( if (debugmode) {
 118        int i;
 119
 120        printf(";; final command line...\n");
 121        for (i = 0; args.v[i]; i++)
 122          printf(";;   %s\n", args.v[i]);
 123        fflush(stdout);
 124   } )
 125
 126   execvp("userv",(char*const*)args.v);
 127   syserror("exec userv");
 128   return -1;
 129 }