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
|
/*
* uAnytun
*
* uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation uAnytun has no support for multiple connections
* or synchronisation. It is a small single threaded implementation intended
* to act as a client on small platforms.
* 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 methods 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) 2007-2016 Christian Pointner <equinox@anytun.org>
*
* This file is part of uAnytun.
*
* uAnytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* uAnytun 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 uAnytun. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#include "datatypes.h"
#include "plain_packet.h"
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
void plain_packet_init(plain_packet_t* packet)
{
if(!packet)
return;
memset (packet, 0, sizeof(*packet));
}
u_int32_t plain_packet_get_header_length()
{
return sizeof(payload_type_t);
}
u_int8_t* plain_packet_get_packet(plain_packet_t* packet)
{
if(!packet)
return NULL;
return packet->data_.buf_;
}
u_int32_t plain_packet_get_length(plain_packet_t* packet)
{
if(!packet)
return 0;
return (packet->payload_length_ + sizeof(payload_type_t));
}
void plain_packet_set_length(plain_packet_t* packet, u_int32_t len)
{
if(!packet)
return;
if(len > PLAIN_PACKET_SIZE_MAX)
len = PLAIN_PACKET_SIZE_MAX - sizeof(payload_type_t);
else if(len < sizeof(payload_type_t))
len = 0;
else
len -= sizeof(payload_type_t);
packet->payload_length_ = len;
}
u_int8_t* plain_packet_get_payload(plain_packet_t* packet)
{
if(!packet || !packet->payload_length_)
return NULL;
return (packet->data_.buf_ + sizeof(payload_type_t));
}
u_int32_t plain_packet_get_payload_length(plain_packet_t* packet)
{
if(!packet)
return 0;
return packet->payload_length_;
}
void plain_packet_set_payload_length(plain_packet_t* packet, u_int32_t len)
{
if(!packet)
return;
if(len > PLAIN_PACKET_SIZE_MAX || (len + sizeof(payload_type_t)) > PLAIN_PACKET_SIZE_MAX)
len = PLAIN_PACKET_SIZE_MAX - sizeof(payload_type_t);
packet->payload_length_ = len;
}
payload_type_t plain_packet_get_type(plain_packet_t* packet)
{
if(!packet)
return 0;
return PAYLOAD_TYPE_T_NTOH(packet->data_.payload_type_);
}
void plain_packet_set_type(plain_packet_t* packet, payload_type_t type)
{
if(!packet)
return;
if(type == PAYLOAD_TYPE_TUN) {
if(!packet->payload_length_) {
packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN);
return;
}
struct ip* hdr = (struct ip*)(packet->data_.buf_ + sizeof(payload_type_t));
if(hdr->ip_v == 4)
packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN4);
else if(hdr->ip_v == 6)
packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN6);
}
else
packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(type);
}
|
