5 * Copyright 1996-2013,2016 Ian Jackson <ijackson@chiark.greenend.org.uk>
6 * Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
8 * Chancellor Masters and Scholars of the University of Cambridge
9 * Copyright 2010 Tony Finch <fanf@dotat.at>
10 * Copyright 2013,2016 Mark Wooding <mdw@distorted.org.uk>
12 * This is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 3 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with userv-utils; if not, see http://www.gnu.org/licenses/.
30 #include <sys/types.h>
35 static const char *const default_envok[] = {
61 static void addarg(struct buildargs *args, const char *a) {
62 if (args->n > args->max) error("too many arguments", 500);
63 args->v[args->n++]= a;
66 static void add_userv_var(const char *fulln,
67 const char *en, const char *ev, void *p) {
68 struct buildargs *args= p;
73 if (l > MAX_ENVVAR_VALUE) error("environment variable too long", 500);
74 a= xmalloc(strlen(en)+l+6);
75 sprintf(a,"-DE_%s=%s",en,ev);
79 int main(int argc, const char **argv) {
81 const char *slash2, *pathi, *ev, *av;
82 const char *const *envok = 0;
83 size_t usernamelen, l;
84 struct buildargs args;
89 if (l>6 && !strcmp(argv[0]+l-6,"-debug")) debugmode= 1;
92 if (fputs("Content-Type: text/plain\n\n",stdout)==EOF || fflush(stdout))
93 syserror("write stdout");
94 if (dup2(1,2)<0) { perror("dup stdout to stderr"); exit(-1); }
95 D( printf(";;; UCGI\n"); )
98 if (argc > MAX_ARGS) error("too many arguments", 500);
100 ev= getenv("UCGI_ENV_FILTER");
102 envok= load_filters(LOADF_MUST, ev, LF_END);
104 envok= load_filters(0, "/etc/userv/ucgi.env-filter", LF_END);
106 pathi= getenv("PATH_INFO");
107 if (!pathi) error("PATH_INFO not found", 500);
109 printf(";; find user name...\n"
110 ";; initial PATH_INFO = `%s'\n",
113 if (pathi[0] != '/' || pathi[1] != '~')
114 error("PATH_INFO must start with /~", 400);
115 slash2= strchr(pathi+2,'/');
116 if (!slash2) error("PATH_INFO must have more than one /", 400);
117 usernamelen= slash2-(pathi+2);
118 if (usernamelen > MAX_USERNAME_LEN) error("PATH_INFO username too long", 400);
119 username= xmalloc(usernamelen+1);
120 memcpy(username,pathi+2,usernamelen); username[usernamelen]= 0;
122 printf(";; user = `%s'; tail = `%s'\n", username, slash2); )
123 if (!isalpha(username[0]))
124 error("username 1st character is not alphabetic", 400);
125 xsetenv("PATH_INFO",slash2,1);
127 args.n= 0; args.max= argc + MAX_ENVVARS + 10;
128 args.v= xmalloc(args.max * sizeof(*args.v));
130 addarg(&args, "userv");
131 if (debugmode) addarg(&args, "-DDEBUG=1");
133 filter_environment(FILTF_WILDCARD, "", envok, default_envok,
134 add_userv_var, &args);
136 addarg(&args, username);
137 addarg(&args, "www-cgi");
138 while ((av= (*++argv))) addarg(&args, av);
143 child= fork(); if (child==-1) syserror("fork");
145 rchild= waitpid(child,&status,0);
146 if (rchild==-1) syserror("waitpid");
147 printf("\nexit status %d %d\n",(status>>8)&0x0ff,status&0x0ff);
155 printf(";; final command line...\n");
156 for (i = 0; args.v[i]; i++)
157 printf(";; %s\n", args.v[i]);
161 execvp("userv",(char*const*)args.v);
162 syserror("exec userv");