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/*
* anytun
*
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methodes used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* Anytun 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 anytun. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _DAEMON_HPP
#define _DAEMON_HPP
#ifndef NO_DAEMON
#include <poll.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <unistd.h>
void chrootAndDrop(std::string const& chrootdir, std::string const& username)
{
if (getuid() != 0)
{
std::cerr << "this programm has to be run as root in order to run in a chroot" << std::endl;
exit(-1);
}
struct passwd *pw = getpwnam(username.c_str());
if(pw) {
if(chroot(chrootdir.c_str()))
{
std::cerr << "can't chroot to " << chrootdir << std::endl;
exit(-1);
}
cLog.msg(Log::PRIO_NOTICE) << "we are in chroot jail (" << chrootdir << ") now" << std::endl;
if(chdir("/"))
{
std::cerr << "can't change to /" << std::endl;
exit(-1);
}
if (initgroups(pw->pw_name, pw->pw_gid) || setgid(pw->pw_gid) || setuid(pw->pw_uid))
{
std::cerr << "can't drop to user " << username << " " << pw->pw_uid << ":" << pw->pw_gid << std::endl;
exit(-1);
}
cLog.msg(Log::PRIO_NOTICE) << "dropped user to " << username << " " << pw->pw_uid << ":" << pw->pw_gid << std::endl;
}
else
{
std::cerr << "unknown user " << username << std::endl;
exit(-1);
}
}
void daemonize()
{
pid_t pid;
pid = fork();
if(pid) exit(0);
setsid();
pid = fork();
if(pid) exit(0);
// std::cout << "running in background now..." << std::endl;
int fd;
// for (fd=getdtablesize();fd>=0;--fd) // close all file descriptors
for (fd=0;fd<=2;fd++) // close all file descriptors
close(fd);
fd = open("/dev/null",O_RDWR); // stdin
if(fd == -1)
cLog.msg(Log::PRIO_WARNING) << "can't open stdin (chroot and no link to /dev/null?)";
else {
if(dup(fd) == -1) // stdout
cLog.msg(Log::PRIO_WARNING) << "can't open stdout";
if(dup(fd) == -1) // stderr
cLog.msg(Log::PRIO_WARNING) << "can't open stderr";
}
umask(027);
}
#endif
#endif
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