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
|
/*
* 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 <string.h>
#include <sstream>
#include <boost/assign.hpp>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <errno.h>
#include <net/if.h>
#include <linux/ip.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#define DEFAULT_DEVICE "/dev/net/tun"
#include "tunDevice.h"
#include "threadUtils.hpp"
#include "log.h"
#include "anytunError.h"
#include "sysExec.h"
TunDevice::TunDevice(std::string dev_name, std::string dev_type, std::string ifcfg_addr, u_int16_t ifcfg_prefix) : conf_(dev_name, dev_type, ifcfg_addr, ifcfg_prefix, 1400)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
if(conf_.type_ == TYPE_TUN) {
ifr.ifr_flags = IFF_TUN;
with_pi_ = true;
}
else if(conf_.type_ == TYPE_TAP) {
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
with_pi_ = false;
}
else
AnytunError::throwErr() << "unable to recognize type of device (tun or tap)";
if(dev_name != "")
strncpy(ifr.ifr_name, dev_name.c_str(), IFNAMSIZ);
fd_ = ::open(DEFAULT_DEVICE, O_RDWR);
if(fd_ < 0)
AnytunError::throwErr() << "can't open device file (" << DEFAULT_DEVICE << "): " << AnytunErrno(errno);
if(!ioctl(fd_, TUNSETIFF, &ifr)) {
actual_name_ = ifr.ifr_name;
} else if(!ioctl(fd_, (('T' << 8) | 202), &ifr)) {
actual_name_ = ifr.ifr_name;
} else {
::close(fd_);
AnytunError::throwErr() << "tun/tap device ioctl failed: " << AnytunErrno(errno);
}
actual_node_ = DEFAULT_DEVICE;
if(ifcfg_addr != "")
do_ifconfig();
}
TunDevice::~TunDevice()
{
if(fd_ > 0)
::close(fd_);
}
int TunDevice::fix_return(int ret, size_t pi_length) const
{
if(ret < 0)
return ret;
return (static_cast<size_t>(ret) > pi_length ? (ret - pi_length) : 0);
}
int TunDevice::read(u_int8_t* buf, u_int32_t len)
{
if(fd_ < 0)
return -1;
if(with_pi_)
{
struct iovec iov[2];
struct tun_pi tpi;
iov[0].iov_base = &tpi;
iov[0].iov_len = sizeof(tpi);
iov[1].iov_base = buf;
iov[1].iov_len = len;
return(fix_return(::readv(fd_, iov, 2), sizeof(tpi)));
}
else
return(::read(fd_, buf, len));
}
int TunDevice::write(u_int8_t* buf, u_int32_t len)
{
if(fd_ < 0)
return -1;
if(!buf)
return 0;
if(with_pi_)
{
struct iovec iov[2];
struct tun_pi tpi;
struct iphdr *hdr = reinterpret_cast<struct iphdr *>(buf);
tpi.flags = 0;
if(hdr->version == 4)
tpi.proto = htons(ETH_P_IP);
else
tpi.proto = htons(ETH_P_IPV6);
iov[0].iov_base = &tpi;
iov[0].iov_len = sizeof(tpi);
iov[1].iov_base = buf;
iov[1].iov_len = len;
return(fix_return(::writev(fd_, iov, 2), sizeof(tpi)));
}
else
return(::write(fd_, buf, len));
}
void TunDevice::init_post()
{
// nothing to be done here
}
void TunDevice::do_ifconfig()
{
std::ostringstream mtu_ss;
mtu_ss << conf_.mtu_;
StringVector args = boost::assign::list_of(actual_name_)(conf_.addr_.toString())("netmask")(conf_.netmask_.toString())("mtu")(mtu_ss.str());
anytun_exec("/sbin/ifconfig", args);
}
|
