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
|
/*
* �Anytun
*
* �Anytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation �Anytun 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 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 Christian Pointner <equinox@anytun.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 "datatypes.h"
#include "udp.h"
#include "log.h"
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
void udp_init(udp_socket_t** sock, const char* local_addr, const char* port)
{
if(!sock || !port)
return;
*sock = malloc(sizeof(udp_socket_t));
if(!*sock)
return;
struct addrinfo hints, *res;
memset (&hints, 0, sizeof (hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags |= AI_PASSIVE;
int errcode = getaddrinfo(local_addr, port, &hints, &res);
if (errcode != 0) {
log_printf(ERR, "Error resolving local address: %s", gai_strerror(errcode));
free(*sock);
*sock = NULL;
return;
}
memcpy(&((*sock)->local_end_), res->ai_addr, sizeof(*(res->ai_addr)));
(*sock)->fd_ = socket(res->ai_family, SOCK_DGRAM, 0);
if((*sock)->fd_ < 0) {
log_printf(ERR, "Error on opening udp socket: %m");
free(*sock);
*sock = NULL;
return;
}
errcode = bind((*sock)->fd_, res->ai_addr, res->ai_addrlen);
if(errcode) {
log_printf(ERR, "Error on binding udp socket: %m");
free(*sock);
*sock = NULL;
return;
}
freeaddrinfo(res);
}
void udp_set_remote(udp_socket_t* sock, const char* remote_addr, const char* port)
{
if(!sock || !remote_addr || !port)
return;
struct addrinfo hints, *res;
memset (&hints, 0, sizeof (hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags |= AI_CANONNAME;
int errcode = getaddrinfo(remote_addr, port, &hints, &res);
if (errcode != 0) {
log_printf(ERR, "Error resolving remote address: %s", gai_strerror(errcode));
return;
}
memcpy(&(sock->remote_end_), res->ai_addr, sizeof(*(res->ai_addr)));
freeaddrinfo(res);
}
void udp_close(udp_socket_t** sock)
{
if(!sock || !(*sock))
return;
if((*sock)->fd_ > 0)
close((*sock)->fd_);
free(*sock);
*sock = NULL;
}
int udp_read(udp_socket_t* sock, u_int8_t* buf, u_int32_t len, struct sockaddr_storage* remote_end_)
{
if(!sock || !remote_end_)
return -1;
return 0;
}
int udp_write(udp_socket_t* sock, u_int8_t* buf, u_int32_t len)
{
if(!sock)
return -1;
return 0;
}
|
