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/*
* Copyright (C) 2014-2017 Firejail Authors
*
* This file is part of firejail project
*
* This program 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 2 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
//#define DEBUG
//static int check_sockaddr(int sockfd, const char *call, const struct sockaddr *addr, int rv) {
static int check_sockaddr(const struct sockaddr *addr) {
if (addr->sa_family == AF_UNIX) {
struct sockaddr_un *a = (struct sockaddr_un *) addr;
if (a->sun_path[0] == '\0' && strstr(a->sun_path + 1, "X11-unix")) {
// printf("@%s\n", a->sun_path + 1);
errno = ENOENT;
return -1;
}
}
return 0;
}
//
// syscalls
//
// connect
typedef int (*orig_connect_t)(int sockfd, const struct sockaddr *addr, socklen_t addrlen);
static orig_connect_t orig_connect = NULL;
int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
if (!orig_connect)
orig_connect = (orig_connect_t)dlsym(RTLD_NEXT, "connect");
if (check_sockaddr(addr) == -1)
return -1;
return orig_connect(sockfd, addr, addrlen);
}
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