2 * Usage: as CGI script, but called by userv
3 * environment variables are USERV_U_E_...
6 * Copyright 1996-2013,2016 Ian Jackson <ijackson@chiark.greenend.org.uk>
7 * Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
9 * Chancellor Masters and Scholars of the University of Cambridge
10 * Copyright 2010 Tony Finch <fanf@dotat.at>
11 * Copyright 2013,2016 Mark Wooding <mdw@distorted.org.uk>
13 * This is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 3 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with userv-utils; if not, see http://www.gnu.org/licenses/.
32 #include <sys/types.h>
38 static const char *const default_envok[]= {
45 "HTTP_ACCEPT_CHARSET",
46 "HTTP_ACCEPT_ENCODING",
47 "HTTP_ACCEPT_LANGUAGE",
50 "HTTP_CONTENT_ENCODING",
60 "HTTP_X_FORWARDED_FOR",
66 "REDIRECT_SCRIPT_URI",
67 "REDIRECT_SCRIPT_URL",
94 static void setenvar(const char *fulln,
95 const char *en, const char *ep, void *p) {
100 int main(int argc, char **argv) {
101 char *scriptpath, *newvar;
102 const char *nextslash, *lastslash, *pathi, *ev, *ev2, *scriptdir, *av;
103 const char *const *envok;
104 const char **arguments;
105 size_t scriptdirlen, scriptpathlen, l;
108 const char *filters= 0;
110 ev= getenv("USERV_U_DEBUG");
111 if (ev && *ev) debugmode= 1;
113 D( if (debugmode) printf(";;; UCGITARGET\n"); )
114 if (argc > MAX_ARGS) error("too many arguments", 500);
117 i= getopt(argc, argv, "+e:"); if (i < 0) break;
119 case 'e': filters= optarg; break;
120 default: error("bad command line", 500); break;
123 argc -= optind; argv += optind;
125 if (!*argv) error("no script directory argument", 500);
126 ev= getenv("HOME"); if (!ev) error("no HOME env. var", 500);
127 l= strlen(*argv)+strlen(ev);
128 newvar= xmalloc(l+2);
129 sprintf(newvar,"%s/%s",ev,*argv);
131 scriptdirlen= strlen(scriptdir);
134 envok= load_filters(LOADF_MUST, filters, LF_END);
136 envok= load_filters(0,
137 ".userv/ucgitarget.env-filter",
138 "/etc/userv/ucgitarget.env-filter",
142 filter_environment(0, "USERV_U_E_", envok, default_envok, setenvar, 0);
145 pathi= getenv("PATH_INFO");
146 if (!pathi) error("PATH_INFO not found", 500);
149 printf(";; find script name...\n"
150 ";; PATH_INFO = `%s'\n",
154 if (*lastslash != '/') error("PATH_INFO expected slash not found", 400);
155 if (lastslash[1]=='.' || lastslash[1]=='#' || !lastslash[1])
156 error("bad char begin", 400);
157 nextslash= strchr(lastslash+1,'/');
158 if (!nextslash) nextslash= lastslash+1+strlen(lastslash+1);
159 if (!nextslash) error("insufficient elements in PATH_INFO", 400);
160 if (nextslash==lastslash+1) error("empty component in PATH_INFO", 400);
161 if (nextslash-pathi > MAX_SCRIPTPATH_LEN)
162 error("PATH_INFO script path too long", 400);
163 scriptpathlen= scriptdirlen+(nextslash-pathi);
164 scriptpath= xrealloc(scriptpath,scriptpathlen+1);
165 strcpy(scriptpath,scriptdir);
166 memcpy(scriptpath+scriptdirlen,pathi,nextslash-pathi);
167 scriptpath[scriptpathlen]= 0;
168 if (scriptpath[scriptpathlen-1]=='~') error("bad char end", 400);
169 D( if (debugmode) printf(";; try `%s'\n", scriptpath); )
170 r= stat(scriptpath,&stab); if (r) syserror("stat script");
171 if (S_ISREG(stab.st_mode)) break;
172 if (!S_ISDIR(stab.st_mode)) error("script not directory or file", 500);
173 lastslash= nextslash;
175 D( if (debugmode) printf(";; found script: tail = `%s'\n", nextslash); )
176 if (*nextslash) xsetenv("PATH_INFO",nextslash,1);
177 else unsetenv("PATH_INFO");
179 newvar= xmalloc(scriptpathlen+strlen(nextslash)+3);
180 sprintf(newvar,"%s%s",scriptpath,nextslash);
181 xsetenv("PATH_TRANSLATED",newvar,1);
183 xsetenv("SCRIPT_FILENAME",scriptpath,1);
185 ev= getenv("SCRIPT_NAME");
187 ev2= getenv("USER"); if (!ev2) error("no USER variable", 500);
188 newvar= xmalloc(strlen(ev)+2+strlen(ev2)+scriptpathlen-scriptdirlen+2);
189 sprintf(newvar,"%s/~%s%s",ev,ev2,scriptpath+scriptdirlen);
190 xsetenv("SCRIPT_NAME",newvar,1);
193 arguments= xmalloc(sizeof(const char*)*(argc+5));
196 arguments[nargs++]= scriptpath;
197 while ((av= (*++argv))) arguments[nargs++]= av;
198 arguments[nargs++]= 0;
203 printf(";; final environment...\n");
204 for (i = 0; environ[i]; i++)
205 printf(";; %s\n", environ[i]);
207 printf(";; final command line...\n");
208 for (i = 0; arguments[i]; i++)
209 printf(";; %s\n", arguments[i]);
213 execvp(scriptpath,(char*const*)arguments);
214 syserror("exec script");