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
183
184
185
186
187
188
189
190
191
192
193
194
|
/*
* 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 anytun.org <satp@wirdorange.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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 (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <iostream>
#include <poll.h>
#include "datatypes.h"
#include "log.h"
#include "buffer.h"
#include "packet.h"
#include "cypher.h"
#include "authAlgo.h"
#include "signalController.h"
#include "packetSource.h"
#include "tunDevice.h"
#include "options.h"
#include "seqWindow.h"
#define PAYLOAD_TYPE_TAP 0x6558
#define PAYLOAD_TYPE_TUN 0x0800
struct Param
{
Options& opt;
TunDevice& dev;
Cypher& c;
AuthAlgo& a;
PacketSource& src;
SeqWindow& seq;
};
void* sender(void* p)
{
Param* param = reinterpret_cast<Param*>(p);
seq_nr_t seq = 0;
while(1)
{
Packet pack(1600); // fix me... mtu size
// read packet from device
int len = param->dev.read(pack);
pack.resizeBack(len);
if(param->opt.getRemoteAddr() == "")
continue;
// add payload type
if(param->dev.getType() == TunDevice::TYPE_TUN)
pack.addPayloadType(PAYLOAD_TYPE_TUN);
else if(param->dev.getType() == TunDevice::TYPE_TAP)
pack.addPayloadType(PAYLOAD_TYPE_TAP);
else
pack.addPayloadType(0);
// cypher the packet
param->c.cypher(pack);
// add header to packet
pack.addHeader(param->opt.getSenderId(), seq);
seq++;
// calc auth_tag and add it to the packet
auth_tag_t at = param->a.calc(pack);
pack.addAuthTag(at);
// send it out to remote host
param->src.send(pack, param->opt.getRemoteAddr(), param->opt.getRemotePort());
}
pthread_exit(NULL);
}
void* receiver(void* p)
{
Param* param = reinterpret_cast<Param*>(p);
while(1)
{
string remote_host;
u_int16_t remote_port;
Packet pack(1600); // fix me... mtu size
// read packet from socket
u_int32_t len = param->src.recv(pack, remote_host, remote_port);
pack.resizeBack(len);
pack.withPayloadType(true).withHeader(true).withAuthTag(true);
// check auth_tag and remove it
auth_tag_t at = pack.getAuthTag();
pack.removeAuthTag();
if(at != param->a.calc(pack))
continue;
// autodetect peer
if(param->opt.getRemoteAddr() == "")
{
param->opt.setRemoteAddrPort(remote_host, remote_port);
cLog.msg(Log::PRIO_NOTICE) << "autodetected remote host " << remote_host << ":" << remote_port;
}
// compare sender_id and seq with window
if(param->seq.hasSeqNr(pack.getSenderId(), pack.getSeqNr()))
continue;
param->seq.addSeqNr(pack.getSenderId(), pack.getSeqNr());
pack.removeHeader();
// decypher the packet
param->c.cypher(pack);
// check payload_type and remove it
if((param->dev.getType() == TunDevice::TYPE_TUN && pack.getPayloadType() != PAYLOAD_TYPE_TUN) ||
(param->dev.getType() == TunDevice::TYPE_TAP && pack.getPayloadType() != PAYLOAD_TYPE_TAP))
continue;
pack.removePayloadType();
// write it on the device
param->dev.write(pack);
}
pthread_exit(NULL);
}
int main(int argc, char* argv[])
{
std::cout << "anytun - secure anycast tunneling protocol" << std::endl;
Options opt;
if(!opt.parse(argc, argv))
{
opt.printUsage();
exit(-1);
}
cLog.msg(Log::PRIO_NOTICE) << "anytun started...";
SignalController sig;
sig.init();
TunDevice dev(opt.getDevName().c_str(), opt.getIfconfigParamLocal().c_str(), opt.getIfconfigParamRemoteNetmask().c_str());
SeqWindow seq(opt.getSeqWindowSize());
NullCypher c;
NullAuthAlgo a;
PacketSource* src;
if(opt.getLocalAddr() == "")
src = new UDPPacketSource(opt.getLocalPort());
else
src = new UDPPacketSource(opt.getLocalAddr(), opt.getLocalPort());
struct Param p = {opt, dev, c, a, *src, seq};
std::cout << "dev created (opened)" << std::endl;
std::cout << "dev opened - actual name is '" << p.dev.getActualName() << "'" << std::endl;
std::cout << "dev type is '" << p.dev.getTypeString() << "'" << std::endl;
pthread_t senderThread;
pthread_create(&senderThread, NULL, sender, &p);
pthread_t receiverThread;
pthread_create(&receiverThread, NULL, receiver, &p);
int ret = sig.run();
pthread_cancel(senderThread);
pthread_cancel(receiverThread);
pthread_join(senderThread, NULL);
pthread_join(receiverThread, NULL);
delete src;
return ret;
}
|
