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
|
/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* 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; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* 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.
*/
/* copyright --> */
#include "DHTRoutingTableSerializer.h"
#include "DHTNode.h"
#include "DlAbortEx.h"
#include "DHTConstants.h"
#include "PeerMessageUtil.h"
#include "Logger.h"
#include "a2netcompat.h"
#include <cerrno>
#include <cstring>
#include <ostream>
namespace aria2 {
DHTRoutingTableSerializer::DHTRoutingTableSerializer():_localNode(0) {}
DHTRoutingTableSerializer::~DHTRoutingTableSerializer() {}
void DHTRoutingTableSerializer::setLocalNode(const SharedHandle<DHTNode>& localNode)
{
_localNode = localNode;
}
void DHTRoutingTableSerializer::setNodes(const std::deque<SharedHandle<DHTNode> >& nodes)
{
_nodes = nodes;
}
void DHTRoutingTableSerializer::serialize(std::ostream& o)
{
char header[8];
memset(header, 0, sizeof(header));
// magic
header[0] = 0xa1;
header[1] = 0xa2;
// format ID
header[2] = 0x02;
// version
header[6] = 0;
header[7] = 0x02;
char zero[16];
memset(zero, 0, sizeof(zero));
try {
o.write(header, 8);
// write save date
uint32_t ntime = htonl(Time().getTime());
o.write(reinterpret_cast<const char*>(&ntime), sizeof(uint32_t));
// 4bytes reserved
o.write(zero, 4);
// localnode
// 8bytes reserved
o.write(zero, 8);
// 20bytes localnode ID
o.write(reinterpret_cast<const char*>(_localNode->getID()), DHT_ID_LENGTH);
// 4bytes reserved
o.write(zero, 4);
// number of nodes
uint32_t numNodes = htonl(_nodes.size());
o.write(reinterpret_cast<const char*>(&numNodes), sizeof(uint32_t));
// 4bytes reserved
o.write(zero, 4);
// nodes
for(std::deque<SharedHandle<DHTNode> >::const_iterator i = _nodes.begin(); i != _nodes.end(); ++i) {
const SharedHandle<DHTNode>& node = *i;
// Currently, only IPv4 address and IPv4-mapped address are saved.
// 6bytes: write IP address + port in Compact IP-address/port info form.
char compactPeer[6];
if(!PeerMessageUtil::createcompact(compactPeer, node->getIPAddress(), node->getPort())) {
memset(compactPeer, 0, 6);
}
// 1byte compact peer format length
o << static_cast<uint8_t>(sizeof(compactPeer));
// 7bytes reserved
o.write(zero, 7);
// 6 bytes compact peer
o.write(compactPeer, 6);
// 2bytes reserved
o.write(zero, 2);
// 16bytes reserved
o.write(zero, 16);
// 20bytes: node ID
o.write(reinterpret_cast<const char*>(node->getID()), DHT_ID_LENGTH);
// 4bytes reserved
o.write(zero, 4);
}
} catch(std::ios::failure const& exception) {
throw new DlAbortEx("Failed to save DHT routing table. cause:%s",
strerror(errno));
}
}
} // namespace aria2
|
