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/*
* Usage: as CGI script
*/
/*
* Copyright 1996-2013,2016 Ian Jackson <ijackson@chiark.greenend.org.uk>
* Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
* Copyright 1999,2003
* Chancellor Masters and Scholars of the University of Cambridge
* Copyright 2010 Tony Finch <fanf@dotat.at>
* Copyright 2013,2016 Mark Wooding <mdw@distorted.org.uk>
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with userv-utils; if not, see http://www.gnu.org/licenses/.
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "ucgi.h"
static const char *const default_envok[] = {
"AUTH_TYPE",
"CONTENT_TYPE",
"CONTENT_LENGTH",
"DOCUMENT_ROOT",
"GATEWAY_INTERFACE",
"HTTP_*",
"HTTPS",
"PATH_INFO",
"PATH_TRANSLATED",
"QUERY_STRING",
"REDIRECT_*",
"REMOTE_*",
"REQUEST_METHOD",
"REQUEST_URI",
"SCRIPT_*",
"SERVER_*",
"SSL_*",
0
};
struct buildargs {
const char **v;
int n, max;
};
static void addarg(struct buildargs *args, const char *a) {
if (args->n > args->max) error("too many arguments", 500);
args->v[args->n++]= a;
}
static void add_userv_var(const char *fulln,
const char *en, const char *ev, void *p) {
struct buildargs *args= p;
size_t l;
char *a;
l= strlen(ev);
if (l > MAX_ENVVAR_VALUE) error("environment variable too long", 500);
a= xmalloc(strlen(en)+l+6);
sprintf(a,"-DE_%s=%s",en,ev);
addarg(args, a);
}
int main(int argc, const char **argv) {
char *username;
const char *slash2, *pathi, *ev, *av;
const char *const *envok = 0;
size_t usernamelen, l;
struct buildargs args;
pid_t child, rchild;
int status;
l= strlen(argv[0]);
if (l>6 && !strcmp(argv[0]+l-6,"-debug")) debugmode= 1;
if (debugmode) {
if (fputs("Content-Type: text/plain\n\n",stdout)==EOF || fflush(stdout))
syserror("write stdout");
if (dup2(1,2)<0) { perror("dup stdout to stderr"); exit(-1); }
D( printf(";;; UCGI\n"); )
}
if (argc > MAX_ARGS) error("too many arguments", 500);
ev= getenv("UCGI_ENV_FILTER");
if (ev)
envok= load_filters(LOADF_MUST, ev, LF_END);
else
envok= load_filters(0, "/etc/userv/ucgi.env-filter", LF_END);
pathi= getenv("PATH_INFO");
if (!pathi) error("PATH_INFO not found", 500);
D( if (debugmode) {
printf(";; find user name...\n"
";; initial PATH_INFO = `%s'\n",
pathi);
} )
if (pathi[0] != '/' || pathi[1] != '~')
error("PATH_INFO must start with /~", 400);
slash2= strchr(pathi+2,'/');
if (!slash2) error("PATH_INFO must have more than one /", 400);
usernamelen= slash2-(pathi+2);
if (usernamelen > MAX_USERNAME_LEN) error("PATH_INFO username too long", 400);
username= xmalloc(usernamelen+1);
memcpy(username,pathi+2,usernamelen); username[usernamelen]= 0;
D( if (debugmode)
printf(";; user = `%s'; tail = `%s'\n", username, slash2); )
if (!isalpha(username[0]))
error("username 1st character is not alphabetic", 400);
xsetenv("PATH_INFO",slash2,1);
args.n= 0; args.max= argc + MAX_ENVVARS + 10;
args.v= xmalloc(args.max * sizeof(*args.v));
addarg(&args, "userv");
if (debugmode) addarg(&args, "-DDEBUG=1");
filter_environment(FILTF_WILDCARD, "", envok, default_envok,
add_userv_var, &args);
addarg(&args, username);
addarg(&args, "www-cgi");
while ((av= (*++argv))) addarg(&args, av);
addarg(&args, 0);
if (debugmode) {
D( fflush(stdout); )
child= fork(); if (child==-1) syserror("fork");
if (child) {
rchild= waitpid(child,&status,0);
if (rchild==-1) syserror("waitpid");
printf("\nexit status %d %d\n",(status>>8)&0x0ff,status&0x0ff);
exit(0);
}
}
D( if (debugmode) {
int i;
printf(";; final command line...\n");
for (i = 0; args.v[i]; i++)
printf(";; %s\n", args.v[i]);
fflush(stdout);
} )
execvp("userv",(char*const*)args.v);
syserror("exec userv");
return -1;
}
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