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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/>.
*/
#include <iostream>
#include <fstream>
#include <poll.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
#include "datatypes.h"
#include "log.h"
#include "signalController.h"
#include "anyCtrOptions.h"
#include "anyCtrSocket.h"
#include "Sockets/ListenSocket.h"
#include "Sockets/SocketHandler.h"
class ThreadParam
{
public:
ThreadParam() : addr(""), port(0) {};
std::string addr;
u_int16_t port;
};
void* syncListener(void* p )
{
ThreadParam* param = reinterpret_cast<ThreadParam*>(p);
SOCKETS_NAMESPACE::SocketHandler h;
SOCKETS_NAMESPACE::ListenSocket<MuxSocket> l(h,true);
if( l.Bind(param->addr, param->port) )
pthread_exit(NULL);
Utility::ResolveLocal(); // resolve local hostname
h.Add(&l);
h.Select(1,0);
while (1) {
h.Select(1,0);
}
}
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;
chdir("/");
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
dup(fd); // stdout
dup(fd); // stderr
umask(027);
}
int main(int argc, char* argv[])
{
if(!gOpt.parse(argc, argv))
{
gOpt.printUsage();
exit(-1);
}
std::ifstream file( gOpt.getFileName().c_str() );
if( file.is_open() )
file.close();
else
{
std::cout << "ERROR: unable to open file!" << std::endl;
exit(-1);
}
std::ofstream pidFile;
if(gOpt.getPidFile() != "") {
pidFile.open(gOpt.getPidFile().c_str());
if(!pidFile.is_open()) {
std::cout << "can't open pid file" << std::endl;
}
}
if(gOpt.getChroot())
chrootAndDrop(gOpt.getChrootDir(), gOpt.getUsername());
if(gOpt.getDaemonize())
daemonize();
if(pidFile.is_open()) {
pid_t pid = getpid();
pidFile << pid;
pidFile.close();
}
SignalController sig;
sig.init();
ThreadParam p;
p.addr = gOpt.getBindToAddr();
p.port = gOpt.getBindToPort();
pthread_t syncListenerThread;
pthread_create(&syncListenerThread, NULL, syncListener, &p);
int ret = sig.run();
pthread_cancel(syncListenerThread);
pthread_join(syncListenerThread, NULL);
return ret;
}
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