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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/* <!-- 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 "DHTRoutingTableDeserializer.h"
#include <cerrno>
#include <cstring>
#include <cassert>
#include <istream>
#include <utility>
#include "DHTNode.h"
#include "DHTConstants.h"
#include "PeerMessageUtil.h"
#include "DlAbortEx.h"
#include "Logger.h"
#include "a2netcompat.h"
#include "StringFormat.h"
#include "Util.h"
#include "array_fun.h"
namespace aria2 {
DHTRoutingTableDeserializer::DHTRoutingTableDeserializer() {}
DHTRoutingTableDeserializer::~DHTRoutingTableDeserializer() {}
static void readBytes(unsigned char* buf, size_t buflen,
std::istream& in, size_t readlen)
{
assert(readlen <= buflen);
in.read(reinterpret_cast<char*>(buf), readlen);
}
#define CHECK_STREAM(in, length) \
if(in.gcount() != length) { \
throw DL_ABORT_EX \
(StringFormat("Failed to load DHT routing table. cause:%s", \
"Unexpected EOF").str()); \
} \
if(!in) { \
throw DL_ABORT_EX \
(StringFormat("Failed to load DHT routing table. cause:%s", \
strerror(errno)).str()); \
}
void DHTRoutingTableDeserializer::deserialize(std::istream& in)
{
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] = 0x03;
char headerCompat[8];
memset(headerCompat, 0, sizeof(headerCompat));
// magic
headerCompat[0] = 0xa1;
headerCompat[1] = 0xa2;
// format ID
headerCompat[2] = 0x02;
// version
headerCompat[6] = 0;
headerCompat[7] = 0x02;
char zero[8];
memset(zero, 0, sizeof(zero));
int version;
// If you change the code to read more than the size of buf, then
// expand the buf size here.
array_wrapper<unsigned char, 255> buf;
// header
readBytes(buf, buf.size(), in, 8);
CHECK_STREAM(in, 8);
if(memcmp(header, buf, 8) == 0) {
version = 3;
} else if(memcmp(headerCompat, buf, 8) == 0) {
version = 2;
} else {
throw DL_ABORT_EX
(StringFormat("Failed to load DHT routing table. cause:%s",
"bad header").str());
}
uint32_t temp32;
uint64_t temp64;
// time
if(version == 2) {
in.read(reinterpret_cast<char*>(&temp32), sizeof(temp32));
CHECK_STREAM(in, sizeof(temp32));
_serializedTime.setTimeInSec(ntohl(temp32));
// 4bytes reserved
readBytes(buf, buf.size(), in, 4);
CHECK_STREAM(in, 4);
} else {
in.read(reinterpret_cast<char*>(&temp64), sizeof(temp64));
CHECK_STREAM(in, sizeof(temp64));
_serializedTime.setTimeInSec(ntoh64(temp64));
}
// localnode
// 8bytes reserved
readBytes(buf, buf.size(), in, 8);
CHECK_STREAM(in, 8);
// localnode ID
readBytes(buf, buf.size(), in, DHT_ID_LENGTH);
CHECK_STREAM(in, DHT_ID_LENGTH);
SharedHandle<DHTNode> localNode(new DHTNode(buf));
// 4bytes reserved
readBytes(buf, buf.size(), in, 4);
CHECK_STREAM(in, 4);
// number of nodes
in.read(reinterpret_cast<char*>(&temp32), sizeof(temp32));
CHECK_STREAM(in, sizeof(temp32));
uint32_t numNodes = ntohl(temp32);
// 4bytes reserved
readBytes(buf, buf.size(), in, 4);
CHECK_STREAM(in, 4);
std::deque<SharedHandle<DHTNode> > nodes;
// nodes
for(size_t i = 0; i < numNodes; ++i) {
// Currently, only IPv4 addresses are supported.
// 1byte compact peer info length
uint8_t peerInfoLen;
in >> peerInfoLen;
if(peerInfoLen != 6) {
// skip this entry
readBytes(buf, buf.size(), in, 42+7+6);
CHECK_STREAM(in, 42+7+6);
continue;
}
// 7bytes reserved
readBytes(buf, buf.size(), in, 7);
CHECK_STREAM(in, 7);
// 6bytes compact peer info
readBytes(buf, buf.size(), in, 6);
CHECK_STREAM(in, 6);
if(memcmp(zero, buf, 6) == 0) {
// skip this entry
readBytes(buf, buf.size(), in, 42);
CHECK_STREAM(in, 42);
continue;
}
std::pair<std::string, uint16_t> peer =
PeerMessageUtil::unpackcompact(buf);
if(peer.first.empty()) {
// skip this entry
readBytes(buf, buf.size(), in, 42);
CHECK_STREAM(in, 42);
continue;
}
// 2bytes reserved
readBytes(buf, buf.size(), in, 2);
CHECK_STREAM(in, 2);
// 16byte reserved
readBytes(buf, buf.size(), in, 16);
CHECK_STREAM(in, 16);
// localnode ID
readBytes(buf, buf.size(), in, DHT_ID_LENGTH);
CHECK_STREAM(in, DHT_ID_LENGTH);
SharedHandle<DHTNode> node(new DHTNode(buf));
node->setIPAddress(peer.first);
node->setPort(peer.second);
// 4bytes reserved
readBytes(buf, buf.size(), in, 4);
CHECK_STREAM(in, 4);
nodes.push_back(node);
}
_localNode = localNode;
_nodes = nodes;
}
} // namespace aria2
|
