| 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 *en, const char *ev, |
| 44 | struct buildargs *args) { |
| 45 | size_t l; |
| 46 | char *a; |
| 47 | |
| 48 | l= strlen(ev); if (l > MAX_ENVVAR_VALUE) error("environment variable too long"); |
| 49 | a= xmalloc(strlen(en)+l+6); |
| 50 | sprintf(a,"-DE_%s=%s",en,ev); |
| 51 | addarg(args, a); |
| 52 | } |
| 53 | |
| 54 | int main(int argc, const char **argv) { |
| 55 | char *username; |
| 56 | const char *slash2, *pathi, *ev, *en, *av; |
| 57 | const char *const *ep; |
| 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 + nenvok + 10; |
| 94 | args.v= xmalloc(args.max * sizeof(*args.v)); |
| 95 | |
| 96 | addarg(&args, "userv"); |
| 97 | if (debugmode) addarg(&args, "-DDEBUG=1"); |
| 98 | |
| 99 | for (ep= envok; (en= *ep); ep++) { |
| 100 | ev= getenv(en); if (!ev) continue; |
| 101 | add_userv_var(en, ev, &args); |
| 102 | } |
| 103 | |
| 104 | addarg(&args, username); |
| 105 | addarg(&args, "www-cgi"); |
| 106 | while ((av= (*++argv))) addarg(&args, av); |
| 107 | addarg(&args, 0); |
| 108 | |
| 109 | if (debugmode) { |
| 110 | D( fflush(stdout); ) |
| 111 | child= fork(); if (child==-1) syserror("fork"); |
| 112 | if (child) { |
| 113 | rchild= waitpid(child,&status,0); |
| 114 | if (rchild==-1) syserror("waitpid"); |
| 115 | printf("\nexit status %d %d\n",(status>>8)&0x0ff,status&0x0ff); |
| 116 | exit(0); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | D( if (debugmode) { |
| 121 | int i; |
| 122 | |
| 123 | printf(";; final command line...\n"); |
| 124 | for (i = 0; args.v[i]; i++) |
| 125 | printf(";; %s\n", args.v[i]); |
| 126 | fflush(stdout); |
| 127 | } ) |
| 128 | |
| 129 | execvp("userv",(char*const*)args.v); |
| 130 | syserror("exec userv"); |
| 131 | return -1; |
| 132 | } |