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
|
/*
* 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 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) 2007-2014 Markus Grüneis, 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 as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* 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/>.
*
* 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.
*/
#ifndef ANYTUN_routingTree_hpp_INCLUDED
#define ANYTUN_routingTree_hpp_INCLUDED
#include "anytunError.h"
class RoutingTree
{
public:
template <class BinaryType>
static void walk(BinaryType bytes ,RoutingTreeNode* node,uint8_t length,uint16_t mux) {
for(int i=0; i<(length/8); i++) {
if(!node->nodes_[bytes[i]]) {
node->nodes_[bytes[i]] = new RoutingTreeNode;
}
node=node->nodes_[bytes[i]];
}
if(length%8) {
unsigned char idx=0xff;
idx <<=8-(length%8);
idx &= bytes[length/8];
unsigned char maxidx=0xff;
maxidx>>=(length%8);
maxidx|=idx;
for(unsigned char i=idx; i<=maxidx; i++) {
if(!node->nodes_[i]) {
node->nodes_[i] = new RoutingTreeNode;
}
node->nodes_[i]->valid_=true;
node->nodes_[i]->mux_=mux;
}
} else {
node->valid_=true;
node->mux_=mux;
}
}
template <class BinaryType>
static uint16_t find(BinaryType bytes ,RoutingTreeNode& root) {
bool valid=0;
uint16_t mux=0;
RoutingTreeNode* node = &root;
if(root.valid_) {
mux=root.mux_;
valid=1;
}
for(size_t level=0; level<bytes.size(); level++) {
if(node->nodes_[bytes[level]]) {
node=node->nodes_[bytes[level]];
if(node->valid_) {
mux=node->mux_;
valid=1;
}
} else {
break;
}
}
if(!valid) {
AnytunError::throwErr() << "no route";
}
return mux;
}
};
#endif
|
