| 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 const char *const envok[]= { |
| 36 | "AUTH_TYPE", |
| 37 | "CONTENT_LENGTH", |
| 38 | "CONTENT_TYPE", |
| 39 | "DOCUMENT_ROOT", |
| 40 | "GATEWAY_INTERFACE", |
| 41 | "HTTP_ACCEPT", |
| 42 | "HTTP_ACCEPT_CHARSET", |
| 43 | "HTTP_ACCEPT_ENCODING", |
| 44 | "HTTP_ACCEPT_LANGUAGE", |
| 45 | "HTTP_CACHE_CONTROL", |
| 46 | "HTTP_CONNECTION", |
| 47 | "HTTP_CONTENT_ENCODING", |
| 48 | "HTTP_COOKIE", |
| 49 | "HTTP_DNT", |
| 50 | "HTTP_HOST", |
| 51 | "HTTP_KEEP_ALIVE", |
| 52 | "HTTP_NEGOTIATE", |
| 53 | "HTTP_PRAGMA", |
| 54 | "HTTP_REFERER", |
| 55 | "HTTP_USER_AGENT", |
| 56 | "HTTP_VIA", |
| 57 | "HTTP_X_FORWARDED_FOR", |
| 58 | "HTTPS", |
| 59 | "PATH_INFO", |
| 60 | "PATH_TRANSLATED", |
| 61 | "QUERY_STRING", |
| 62 | "REMOTE_ADDR", |
| 63 | "REMOTE_HOST", |
| 64 | "REMOTE_USER", |
| 65 | "REMOTE_IDENT", |
| 66 | "REQUEST_METHOD", |
| 67 | "REQUEST_URI", |
| 68 | "SCRIPT_FILENAME", |
| 69 | "SCRIPT_NAME", |
| 70 | "SCRIPT_URI", |
| 71 | "SCRIPT_URL", |
| 72 | "SERVER_ADDR", |
| 73 | "SERVER_ADMIN", |
| 74 | "SERVER_NAME", |
| 75 | "SERVER_PORT", |
| 76 | "SERVER_PROTOCOL", |
| 77 | "SERVER_SIGNATURE", |
| 78 | "SERVER_SOFTWARE", |
| 79 | 0 |
| 80 | }; |
| 81 | |
| 82 | static void setenvar(const char *fulln, |
| 83 | const char *en, const char *ep, void *p) { |
| 84 | xsetenv(en, ep, 1); |
| 85 | unsetenv(fulln); |
| 86 | } |
| 87 | |
| 88 | int main(int argc, const char **argv) { |
| 89 | char *scriptpath, *newvar; |
| 90 | const char *nextslash, *lastslash, *pathi, *ev, *ev2, *scriptdir, *av; |
| 91 | const char **arguments; |
| 92 | size_t scriptdirlen, scriptpathlen, l; |
| 93 | struct stat stab; |
| 94 | int r, nargs; |
| 95 | |
| 96 | ev= getenv("USERV_U_DEBUG"); |
| 97 | if (ev && *ev) debugmode= 1; |
| 98 | |
| 99 | D( if (debugmode) printf(";;; UCGITARGET\n"); ) |
| 100 | if (argc > MAX_ARGS) error("too many arguments"); |
| 101 | |
| 102 | if (!*++argv) error("no script directory argument"); |
| 103 | ev= getenv("HOME"); if (!ev) error("no HOME env. var"); |
| 104 | l= strlen(*argv)+strlen(ev); |
| 105 | newvar= xmalloc(l+2); |
| 106 | sprintf(newvar,"%s/%s",ev,*argv); |
| 107 | scriptdir= newvar; |
| 108 | scriptdirlen= strlen(scriptdir); |
| 109 | |
| 110 | filter_environment(0, "USERV_U_E_", envok, setenvar, 0); |
| 111 | |
| 112 | scriptpath= 0; |
| 113 | pathi= getenv("PATH_INFO"); |
| 114 | if (!pathi) error("PATH_INFO not found"); |
| 115 | lastslash= pathi; |
| 116 | D( if (debugmode) { |
| 117 | printf(";; find script name...\n" |
| 118 | ";; PATH_INFO = `%s'\n", |
| 119 | pathi); |
| 120 | } ) |
| 121 | for (;;) { |
| 122 | if (*lastslash != '/') error("PATH_INFO expected slash not found"); |
| 123 | if (lastslash[1]=='.' || lastslash[1]=='#' || !lastslash[1]) error("bad char begin"); |
| 124 | nextslash= strchr(lastslash+1,'/'); |
| 125 | if (!nextslash) nextslash= lastslash+1+strlen(lastslash+1); |
| 126 | if (!nextslash) error("insufficient elements in PATH_INFO"); |
| 127 | if (nextslash==lastslash+1) error("empty component in PATH_INFO"); |
| 128 | if (nextslash-pathi > MAX_SCRIPTPATH_LEN) error("PATH_INFO script path too long"); |
| 129 | scriptpathlen= scriptdirlen+(nextslash-pathi); |
| 130 | scriptpath= xrealloc(scriptpath,scriptpathlen+1); |
| 131 | strcpy(scriptpath,scriptdir); |
| 132 | memcpy(scriptpath+scriptdirlen,pathi,nextslash-pathi); |
| 133 | scriptpath[scriptpathlen]= 0; |
| 134 | if (scriptpath[scriptpathlen-1]=='~') error("bad char end"); |
| 135 | D( if (debugmode) printf(";; try `%s'\n", scriptpath); ) |
| 136 | r= stat(scriptpath,&stab); if (r) syserror("stat script"); |
| 137 | if (S_ISREG(stab.st_mode)) break; |
| 138 | if (!S_ISDIR(stab.st_mode)) error("script not directory or file"); |
| 139 | lastslash= nextslash; |
| 140 | } |
| 141 | D( if (debugmode) printf(";; found script: tail = `%s'\n", nextslash); ) |
| 142 | if (*nextslash) xsetenv("PATH_INFO",nextslash,1); |
| 143 | else unsetenv("PATH_INFO"); |
| 144 | |
| 145 | newvar= xmalloc(scriptpathlen+strlen(nextslash)+3); |
| 146 | sprintf(newvar,"%s%s",scriptpath,nextslash); |
| 147 | xsetenv("PATH_TRANSLATED",newvar,1); |
| 148 | |
| 149 | xsetenv("SCRIPT_FILENAME",scriptpath,1); |
| 150 | |
| 151 | ev= getenv("SCRIPT_NAME"); |
| 152 | if (ev) { |
| 153 | ev2= getenv("USER"); if (!ev2) error("no USER variable"); |
| 154 | newvar= xmalloc(strlen(ev)+2+strlen(ev2)+scriptpathlen-scriptdirlen+2); |
| 155 | sprintf(newvar,"%s/~%s%s",ev,ev2,scriptpath+scriptdirlen); |
| 156 | xsetenv("SCRIPT_NAME",newvar,1); |
| 157 | } |
| 158 | |
| 159 | arguments= xmalloc(sizeof(const char*)*(argc+5)); |
| 160 | nargs= 0; |
| 161 | |
| 162 | arguments[nargs++]= scriptpath; |
| 163 | while ((av= (*++argv))) arguments[nargs++]= av; |
| 164 | arguments[nargs++]= 0; |
| 165 | |
| 166 | D( if (debugmode) { |
| 167 | int i; |
| 168 | |
| 169 | printf(";; final environment...\n"); |
| 170 | for (i = 0; environ[i]; i++) |
| 171 | printf(";; %s\n", environ[i]); |
| 172 | |
| 173 | printf(";; final command line...\n"); |
| 174 | for (i = 0; arguments[i]; i++) |
| 175 | printf(";; %s\n", arguments[i]); |
| 176 | fflush(stdout); |
| 177 | } ) |
| 178 | |
| 179 | execvp(scriptpath,(char*const*)arguments); |
| 180 | syserror("exec script"); |
| 181 | return -1; |
| 182 | } |