forked from nitmir/btdht-crawler
-
Notifications
You must be signed in to change notification settings - Fork 0
/
torrent.py
439 lines (392 loc) · 16.3 KB
/
torrent.py
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
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
# -*- coding: utf-8 -*-
import time
import hashlib
import socket
import select
import struct
import math
import collections
from threading import Thread
from btdht.utils import bencode, bdecode, _bdecode, BcodeError, ID
class MetaDataDownloaded(Exception):
pass
class MetaDataToBig(Exception):
pass
class ToRead(Exception):
pass
class Client(object):
"""A torrent client retrieving metadata files"""
_am_choking = {} # socket -> bool
_am_interested = {} # socket -> bool
_peer_choking = {} # socket -> bool
_peer_interested = {} # socket -> bool
_am_metadata = 1
_peer_extended = {} # socket -> bool
_peer_metadata = {} # socket -> int
_metadata_size = {}# hash -> int
_metadata_size_qorum = {} # hash -> size -> nb
_metadata_pieces = {} # hash -> list/array
_metadata_pieces_received = {} # hash -> int
_metadata_pieces_nb = {} # hash -> int
_socket_hash = {} # socket -> hash
_socket_toread = {} # socket -> str
_socket_handshake = {} # socket -> bool
_socket_ipport = {} # socket -> (ip, port)
_hash_socket = collections.defaultdict(set) # hash -> socket set
_peers_socket = {} # (ip, port, hash) -> socket
_fd_to_socket = {} # int -> socket
meta_data = {} # hash -> bytes
stoped = True
threads = []
def __init__(self, debug=False):
self.debug = debug
self.poll = select.poll()
def stop(self):
self.stoped = True
for i in range(60):
if not [t for t in self.threads if t.is_alive()]:
break
time.sleep(1)
if [t for t in self.threads if t.is_alive()]:
print "Unable to stop threads"
def start(self):
self.stoped = False
self.id = str(ID())
t = Thread(target=self._recv_loop)
t.setName("Client:recv_loop")
t.daemon = True
t.start()
self.threads.append(t)
def _recv_loop(self):
while True:
if self.stoped:
return
try:
events = self.poll.poll(1000)
#sockets, _, _ = select.select(self._socket_hash.keys(), [], [], 1)
for fileno, flag in events:
s = self._fd_to_socket[fileno]
if (flag & (select.POLLIN|select.POLLPRI)):
try:
self.recv(s)
except (ToRead, socket.timeout):
pass
except socket.error as e:
if e.errno not in [11]:
self.clean_socket(s)
except (MetaDataToBig, BcodeError, ValueError, KeyError) as e:
self.clean_socket(s)
elif (flag & (select.POLLERR | select.POLLHUP | select.POLLNVAL)):
print flag
self.clean_socket(s)
except (socket.error, select.error) as e:
if e.args[0] != 9:
print e
except KeyError:
pass
def init_hash(self, hash):
mps = self.most_probably_size(hash)
self._metadata_size[hash] = mps
self._metadata_pieces_nb[hash] = int(math.ceil(mps/(16.0*1024)))
self._metadata_pieces[hash] = [None] * self._metadata_pieces_nb[hash]
self._metadata_pieces_received[hash] = 0
self._metadata_size_qorum[hash] = {mps:10}
def clean_socket(self, s, hash=None):
def rem(d, s):
try: del d[s]
except KeyError: pass
try:
if hash is None:
hash = self._socket_hash[s]
(ip, port) = self._socket_ipport[s]
rem(self._peers_socket, (ip, port, hash))
except KeyError:
pass
try: self.poll.unregister(s)
except (KeyError, select.error, socket.error): pass
try: del self._fd_to_socket[s.fileno()]
except (KeyError, socket.error): pass
rem(self._socket_toread, s)
rem(self._socket_handshake, s)
rem(self._socket_hash, s)
rem(self._peer_metadata, s)
rem(self._peer_extended, s)
rem(self._am_choking, s)
rem(self._am_interested, s)
rem(self._peer_choking, s)
rem(self._peer_interested, s)
rem(self._socket_ipport, s)
try:self._hash_socket[hash].remove(s)
except KeyError: pass
try:s.close()
except: pass
def clean_hash(self, hash):
def rem(d, s):
try: del d[s]
except KeyError: pass
for s in list(self._hash_socket[hash]):
self.clean_socket(s, hash)
rem(self._metadata_size, hash)
rem(self._metadata_pieces, hash)
rem(self._metadata_pieces_received, hash)
rem(self._metadata_pieces_nb, hash)
rem(self._hash_socket, hash)
rem(self._metadata_size_qorum, hash)
@staticmethod
def _create_connection(addr):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(0.5)
l_onoff = 1
l_linger = 0
# This will cause TCP to abort the connection when it is closed, flush the data and send a RST
# instead of going to the state TIME_WAIT
s.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER, struct.pack('ii', l_onoff, l_linger))
s.connect(addr)
return s
def add(self, ip, port, hash):
if hash in self.meta_data:
return True
if self.stoped:
return None
if not (ip, port, hash) in self._peers_socket:
try:
s = self._create_connection((ip, port))
except (socket.timeout, socket.error, ValueError, BcodeError):
return False
self._peers_socket[(ip, port, hash)] = s
self._socket_ipport[s] = (ip, port)
self._peer_extended[s] = False
self._peer_metadata[s] = False
self._peer_interested[s] = False
self._peer_choking[s] = True
self._am_interested[s] = False
self._am_choking[s] = True
self._socket_toread[s] = ""
self._socket_handshake[s] = False
self._hash_socket[hash].add(s)
if not hash in self._metadata_size_qorum:
self._metadata_size_qorum[hash] = {}
self._socket_hash[s] = hash
self._fd_to_socket[s.fileno()]=s
try:
self.poll.register(s, select.POLLIN|select.POLLHUP|select.POLLERR|select.POLLNVAL|select.POLLPRI)
self.handshake(s)
s.settimeout(0.0)
except (socket.timeout, socket.error, ValueError, BcodeError) as e:
if self.debug:
print "handshake fail:%r" % e
self.clean_socket(s)
return False
return True
def handle_0(self, s, _): # choke
self._am_choking[s] = True
def handle_1(self, s, _): # unchoke
self._am_choking[s] = False
#print "requesting %s pieces for %s" % (self._metadata_pieces_nb, self.info_hash.encode("hex"))
try:
for i in range(self._metadata_pieces_nb[self._socket_hash[s]]):
if self._metadata_pieces[self._socket_hash[s]][i] is None:
self.metadata_request(s, i)
except IndexError:
pass
def handle_2(self, s, _): # interested
self._peer_interested[s] = True
def handle_3(self, s, _): # not interested
self._peer_interested[s] = False
def handle_4(self, s, _): # have
pass
def handle_5(self, s, payload):
pass
def most_probably_size(self, hash):
s=0
s_nb=0
for size, nb in self._metadata_size_qorum[hash].items():
if nb > s_nb or (nb == s_nb and size < s and size > 0):
s = size
s_nb = nb
return s
def handle_20(self, s, payload): # extension type
msg_typ = ord(payload[0])
msg = payload[1:]
if msg_typ == 0:
hash = self._socket_hash[s]
msg = bdecode(msg)
if 'metadata_size' in msg:
if msg['metadata_size'] > 8192000 or msg['metadata_size'] < 1: # plus de 8000ko or less thant 1o
self.clean_socket(s)
if not msg['metadata_size'] in self._metadata_size_qorum[hash]:
self._metadata_size_qorum[hash][msg['metadata_size']] = 1
else:
self._metadata_size_qorum[hash][msg['metadata_size']]+=1
self._peer_metadata[s] = msg['m']['ut_metadata']
if not hash in self._metadata_size:
self._metadata_size[hash] = msg['metadata_size']
self._metadata_pieces_nb[hash] = int(math.ceil(self._metadata_size[hash]/(16.0*1024)))
self._metadata_pieces[hash] = [None] * self._metadata_pieces_nb[hash]
self._metadata_pieces_received[hash] = 0
else:
mps = self.most_probably_size(hash)
if self._metadata_size[hash] < mps:
piece_nb = int(math.ceil(mps/(16.0*1024)))
self._metadata_pieces[hash] = self._metadata_pieces[hash] + ([None] * (piece_nb - self._metadata_pieces_nb[hash]))
self._metadata_size[hash] = mps
self._metadata_pieces_nb[hash] = piece_nb
elif self._metadata_size[hash] > mps:
self._metadata_size[hash] = mps
self._metadata_pieces_nb[hash] = int(math.ceil(mps/(16.0*1024)))
self._metadata_pieces[hash] = self._metadata_pieces[hash][0:self._metadata_pieces_nb[hash]]
self._metadata_pieces_received[hash] = len([i for i in self._metadata_pieces[hash] if i is not None])
self.interested(s)
elif msg_typ == self._am_metadata:
hash = self._socket_hash[s]
msg, data = _bdecode(msg)
if msg['msg_type'] == 0:
if self._metadata_pieces[hash] and msg['piece'] < self._metadata_pieces_nb[hash]:
self.metadata_data(s, msg['piece'])
else:
self.metadata_reject(s, msg['piece'])
elif msg['msg_type'] == 1:
try:
if msg['piece'] < self._metadata_pieces_nb[hash] and self._metadata_pieces[hash][msg['piece']] is None:
self._metadata_pieces[hash][msg['piece']] = data
self._metadata_pieces_received[hash] += 1
if self._metadata_pieces_received[hash] == self._metadata_pieces_nb[hash]:
metadata = "".join(self._metadata_pieces[hash])
if hashlib.sha1(metadata).digest() == hash:
self.meta_data[hash] = metadata
self.clean_hash(hash)
if self.debug:
print "metadata complete"
else:
self.init_hash(hash)
if self.debug:
print "bad metadata %s != %s" % (hashlib.sha1(metadata).hexdigest(), hash.encode("hex"))
except (IndexError, TypeError):
pass
elif msg['msg_type'] == 2:
pass
else:
pass
def recv(self, s):
hash = self._socket_hash[s]
if hash in self.meta_data:
self.clean_socket(s)
msgl_old = len(self._socket_toread[s])
self._socket_toread[s] += s.recv(4096)
msgl = len(self._socket_toread[s])
# if read 0B socket closed
if msgl_old == msgl:
raise socket.error("recv 0 bytes")
while self._socket_toread[s]:
msg = self._socket_toread[s]
msgl = len(msg)
# if handshake not received
if not self._socket_handshake[s]:
pstrlen = ord(msg[0])
if len(msg) < 1+pstrlen+8+20+20:
raise ToRead()
self._socket_handshake[s] = True
self._socket_toread[s] = msg[1+pstrlen+8+20+20:]
self.handle_handshake(s, msg[:1+pstrlen+8+20+20])
else:
if msgl < 4:
raise ToRead()
msg_len = struct.unpack("!I", msg[:4])[0]
if msgl < msg_len + 4:
raise ToRead()
if msg_len > 0:
msg_typ = ord(msg[4])
paypload = msg[5:4+msg_len]
self._socket_toread[s] = msg[4+msg_len:]
if hasattr(self, "handle_%s" % msg_typ):
getattr(self, "handle_%s" % msg_typ)(s, paypload)
else:
self._socket_toread[s] = msg[4:]
def recv_fixlen(self, s, i):
msg = ""
msgl = 0
while msgl < i:
tmp = s.recv(i-msgl)
if tmp == "":
raise socket.error("recv 0 bytes")
msg+=tmp
msgl+=len(tmp)
return msg
def handle_handshake(self, s, msg):
pstrlen = ord(msg[0])
pstr = msg[1:1+pstrlen]
reserved = msg[1+pstrlen:1+pstrlen+8]
self._peer_extended[s] = (ord(reserved[5]) & 16) == 16
info_hash = msg[1+pstrlen+8:1+pstrlen+8+20]
peer_id = msg[1+pstrlen+8+20:1+pstrlen+8+20+20]
if self._peer_extended[s]:
self.extended_handshake(s)
else:
self.clean_socket(s)
def handshake(self, s):
reserved_bits = ["\0","\0","\0","\0","\0","\0","\0","\0"]
# advertise Extension Protocol
reserved_bits[5]= chr(ord(reserved_bits[5]) | ord('\x10'))
reserved_bits="".join(reserved_bits)
msg="%sBitTorrent protocol%s%s%s" % (chr(19), reserved_bits, self._socket_hash[s], self.id)
s.send(msg)
def keep_alive(self, s):
msg=struct.pack("!I", 0)
s.send(msg)
def choke(self, s):
msg=struct.pack("!IB", 1, 0)
s.send(msg)
def unckoke(self, s):
msg=struct.pack("!IB", 1, 1)
s.send(msg)
def interested(self, s):
if self._am_interested[s]:
raise ValueError("already interested")
msg=struct.pack("!IB", 1, 2)
s.send(msg)
self._am_interested[s] = True
def notinterested(self, s):
if not self._am_interested[s]:
raise ValueError("already not interested")
msg=struct.pack("!IB", 1, 3)
s.send(msg)
self._am_interested[s] = False
def have(self, s, piece_index):
msg=struct.pack("!IBI", 5, 4, piece_index)
s.send(msg)
def extended_handshake(self, s):
if not self._peer_extended[s]:
raise ValueError("Peer does not support extension protocol")
pl = bencode({'m':{'ut_metadata': self._am_metadata}})
msg=struct.pack("!IBB", 1 + 1 + len(pl), 20, 0)
msg+=pl
s.send(msg)
def metadata_request(self, s, piece):
if not self._peer_metadata[s]:
raise ValueError("peer does not support metadata extension")
if self._am_choking[s]:
raise ValueError("chocked")
if piece < self._metadata_pieces_nb[self._socket_hash[s]]:
pl = bencode({'msg_type': 0, 'piece': piece})
msg=struct.pack("!IBB", 1 + 1 + len(pl), 20, self._peer_metadata[s])
msg+=pl
s.send(msg)
def metadata_reject(self, s, piece):
if not self._peer_metadata[s]:
raise ValueError("peer does not support metadata extension")
if self._am_choking[s]:
raise ValueError("chocked")
pl = bencode({'msg_type': 2, 'piece': piece})
msg=struct.pack("!IBB", 1 + 1 + len(pl), 20, self._peer_metadata[s])
msg+=pl
s.send(msg)
def metadata_data(self, s, piece):
if not self._peer_metadata[s]:
raise ValueError("peer does not support metadata extension")
if self._am_choking[s]:
raise ValueError("chocked")
pl = bencode({'msg_type': 1, 'piece': piece, 'total_size': len(self._metadata_pieces[self._socket_hash[s]][piece])})
pl += self._metadata_pieces[self._socket_hash[s]][piece]
msg=struct.pack("!IBB", 1 + 1 + len(pl), 20, self._peer_metadata[s])
msg+=pl
s.send(msg)