forked from sipa/bitcoin-seeder
-
Notifications
You must be signed in to change notification settings - Fork 0
/
bitcoin.cpp
332 lines (302 loc) · 9.41 KB
/
bitcoin.cpp
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
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
#include <algorithm>
#include "db.h"
#include "netbase.h"
#include "protocol.h"
#include "serialize.h"
#include "uint256.h"
#define BITCOIN_SEED_NONCE 0x0539a019ca550825ULL
using namespace std;
class CNode {
SOCKET sock;
CDataStream vSend;
CDataStream vRecv;
unsigned int nHeaderStart;
unsigned int nMessageStart;
int nVersion;
string strSubVer;
int nStartingHeight;
vector<CAddress> *vAddr;
int ban;
int64 doneAfter;
CAddress you;
int GetTimeout() {
if (you.IsTor())
return 120;
else
return 30;
}
void BeginMessage(const char *pszCommand) {
if (nHeaderStart != -1) AbortMessage();
nHeaderStart = vSend.size();
vSend << CMessageHeader(pszCommand, 0);
nMessageStart = vSend.size();
//printf("%s: SEND %s\n", ToString(you).c_str(), pszCommand);
}
void AbortMessage() {
if (nHeaderStart == -1) return;
vSend.resize(nHeaderStart);
nHeaderStart = -1;
nMessageStart = -1;
}
void EndMessage() {
if (nHeaderStart == -1) return;
unsigned int nSize = vSend.size() - nMessageStart;
memcpy((char*)&vSend[nHeaderStart] + offsetof(CMessageHeader, nMessageSize), &nSize, sizeof(nSize));
if (vSend.GetVersion() >= 209) {
uint256 hash = Hash(vSend.begin() + nMessageStart, vSend.end());
unsigned int nChecksum = 0;
memcpy(&nChecksum, &hash, sizeof(nChecksum));
assert(nMessageStart - nHeaderStart >= offsetof(CMessageHeader, nChecksum) + sizeof(nChecksum));
memcpy((char*)&vSend[nHeaderStart] + offsetof(CMessageHeader, nChecksum), &nChecksum, sizeof(nChecksum));
}
nHeaderStart = -1;
nMessageStart = -1;
}
void Send() {
if (sock == INVALID_SOCKET) return;
if (vSend.empty()) return;
int nBytes = send(sock, &vSend[0], vSend.size(), 0);
if (nBytes > 0) {
vSend.erase(vSend.begin(), vSend.begin() + nBytes);
} else {
close(sock);
sock = INVALID_SOCKET;
}
}
void PushVersion()
{
int64 nTime = time(NULL);
uint64 nLocalNonce = BITCOIN_SEED_NONCE;
int64 nLocalServices = 0;
CAddress me(CService("0.0.0.0"));
BeginMessage("version");
int nBestHeight = GetRequireHeight();
string ver = "/Safe Seeder:0.0.1/";
vSend << PROTOCOL_VERSION << nLocalServices << nTime << you << me << nLocalNonce << ver << nBestHeight;
EndMessage();
}
void GotVersion()
{
//printf("\n%s: version %i\n", ToString(you).c_str(), nVersion);
if (vAddr) {
BeginMessage("getaddr");
EndMessage();
doneAfter = time(NULL) + GetTimeout();
} else {
doneAfter = time(NULL) + 1;
}
}
bool ProcessMessage(string strCommand, CDataStream& vRecv)
{
//printf("%s: RECV %s\n", ToString(you).c_str(), strCommand.c_str());
if (strCommand == "version")
{
int64 nTime;
CAddress addrMe;
CAddress addrFrom;
uint64 nNonce = 1;
vRecv >> nVersion >> you.nServices >> nTime >> addrMe;
if (nVersion == 10300) nVersion = 300;
if (nVersion >= 106 && !vRecv.empty())
vRecv >> addrFrom >> nNonce;
if (nVersion >= 106 && !vRecv.empty())
vRecv >> strSubVer;
if (nVersion >= 209 && !vRecv.empty())
vRecv >> nStartingHeight;
if (nVersion >= 209)
{
BeginMessage("verack");
EndMessage();
}
vSend.SetVersion(min(nVersion, PROTOCOL_VERSION));
if (nVersion < 209)
{
this->vRecv.SetVersion(min(nVersion, PROTOCOL_VERSION));
GotVersion();
}
return false;
}
if (strCommand == "verack")
{
this->vRecv.SetVersion(min(nVersion, PROTOCOL_VERSION));
GotVersion();
return false;
}
if (strCommand == "addr" && vAddr)
{
vector<CAddress> vAddrNew;
vRecv >> vAddrNew;
//printf("%s: got %i addresses\n", ToString(you).c_str(), (int)vAddrNew.size());
int64 now = time(NULL);
vector<CAddress>::iterator it = vAddrNew.begin();
if (vAddrNew.size() > 1)
{
if (doneAfter == 0 || doneAfter > now + 1) doneAfter = now + 1;
}
while (it != vAddrNew.end())
{
CAddress &addr = *it;
//printf("%s: got address %s\n", ToString(you).c_str(), addr.ToString().c_str(), (int)(vAddr->size()));
it++;
if (addr.nTime <= 100000000 || addr.nTime > now + 600)
addr.nTime = now - 5 * 86400;
if (addr.nTime > now - 604800)
vAddr->push_back(addr);
//printf("%s: added address %s (#%i)\n", ToString(you).c_str(), addr.ToString().c_str(), (int)(vAddr->size()));
if (vAddr->size() > 1000) {doneAfter = 1; return true; }
}
return false;
}
return false;
}
bool ProcessMessages()
{
if (vRecv.empty()) return false;
do {
CDataStream::iterator pstart = search(vRecv.begin(), vRecv.end(), BEGIN(pchMessageStart), END(pchMessageStart));
int nHeaderSize = vRecv.GetSerializeSize(CMessageHeader());
if (vRecv.end() - pstart < nHeaderSize)
{
if (vRecv.size() > nHeaderSize)
{
vRecv.erase(vRecv.begin(), vRecv.end() - nHeaderSize);
}
break;
}
vRecv.erase(vRecv.begin(), pstart);
vector<char> vHeaderSave(vRecv.begin(), vRecv.begin() + nHeaderSize);
CMessageHeader hdr;
vRecv >> hdr;
if (!hdr.IsValid())
{
//printf("%s: BAD (invalid header)\n", ToString(you).c_str());
ban = 100000;
return true;
}
string strCommand = hdr.GetCommand();
unsigned int nMessageSize = hdr.nMessageSize;
if (nMessageSize > MAX_SIZE)
{
//printf("%s: BAD (message too large)\n", ToString(you).c_str());
ban = 100000;
return true;
}
if (nMessageSize > vRecv.size())
{
vRecv.insert(vRecv.begin(), vHeaderSave.begin(), vHeaderSave.end());
break;
}
if (vRecv.GetVersion() >= 209)
{
uint256 hash = Hash(vRecv.begin(), vRecv.begin() + nMessageSize);
unsigned int nChecksum = 0;
memcpy(&nChecksum, &hash, sizeof(nChecksum));
if (nChecksum != hdr.nChecksum) continue;
}
CDataStream vMsg(vRecv.begin(), vRecv.begin() + nMessageSize, vRecv.nType, vRecv.nVersion);
vRecv.ignore(nMessageSize);
if (ProcessMessage(strCommand, vMsg))
return true;
//printf("%s: done processing %s\n", ToString(you).c_str(), strCommand.c_str());
} while(1);
return false;
}
public:
CNode(const CService& ip, vector<CAddress>* vAddrIn) : you(ip), nHeaderStart(-1), nMessageStart(-1), vAddr(vAddrIn), ban(0), doneAfter(0), nVersion(0) {
vSend.SetType(SER_NETWORK);
vSend.SetVersion(0);
vRecv.SetType(SER_NETWORK);
vRecv.SetVersion(0);
if (time(NULL) > 1329696000) {
vSend.SetVersion(209);
vRecv.SetVersion(209);
}
}
bool Run()
{
bool res = true;
if (!ConnectSocket(you, sock)) return false;
PushVersion();
Send();
int64 now;
while (now = time(NULL), ban == 0 && (doneAfter == 0 || doneAfter > now) && sock != INVALID_SOCKET) {
char pchBuf[0x10000];
fd_set set;
FD_ZERO(&set);
FD_SET(sock,&set);
struct timeval wa;
if (doneAfter) {
wa.tv_sec = doneAfter - now;
wa.tv_usec = 0;
} else {
wa.tv_sec = GetTimeout();
wa.tv_usec = 0;
}
int ret = select(sock+1, &set, NULL, &set, &wa);
if (ret != 1) {
if (!doneAfter) res = false;
break;
}
int nBytes = recv(sock, pchBuf, sizeof(pchBuf), 0);
int nPos = vRecv.size();
if (nBytes > 0) {
vRecv.resize(nPos + nBytes);
memcpy(&vRecv[nPos], pchBuf, nBytes);
} else if (nBytes == 0) {
//printf("%s: BAD (connection closed prematurely)\n", ToString(you).c_str());
res = false;
break;
} else {
//printf("%s: BAD (connection error)\n", ToString(you).c_str());
res = false;
break;
}
ProcessMessages();
Send();
}
if (sock == INVALID_SOCKET) res = false;
close(sock);
sock = INVALID_SOCKET;
return (ban == 0) && res;
}
int GetBan() {
return ban;
}
int GetClientVersion() {
return nVersion;
}
std::string GetClientSubVersion() {
return strSubVer;
}
int GetStartingHeight() {
return nStartingHeight;
}
};
bool TestNode(const CService &cip, int &ban, int &clientV, std::string &clientSV, int &blocks, vector<CAddress>* vAddr) {
try {
CNode node(cip, vAddr);
bool ret = node.Run();
if (!ret) {
ban = node.GetBan();
} else {
ban = 0;
}
clientV = node.GetClientVersion();
clientSV = node.GetClientSubVersion();
blocks = node.GetStartingHeight();
//printf("%s: %s!!!\n", cip.ToString().c_str(), ret ? "GOOD" : "BAD");
return ret;
} catch(std::ios_base::failure& e) {
ban = 0;
return false;
}
}
/*
int main(void) {
CService ip("47.74.13.245", 5555, true);
vector<CAddress> vAddr;
vAddr.clear();
int ban = 0;
bool ret = TestNode(ip, ban, vAddr);
printf("ret=%s ban=%i vAddr.size()=%i\n", ret ? "good" : "bad", ban, (int)vAddr.size());
}*/