summaryrefslogtreecommitdiff
path: root/src/anytun-controld.cpp
blob: 4f59743852ffaa28be8f17a40c87a386cd76fa5b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/*
 *  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;
}