-
Notifications
You must be signed in to change notification settings - Fork 1.7k
/
sock.py
241 lines (197 loc) · 6.54 KB
/
sock.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
from __future__ import absolute_import
from __future__ import division
import errno
import select
import six
import socket
from pwnlib.log import getLogger
from pwnlib.tubes.tube import tube
log = getLogger(__name__)
class sock(tube):
"""Base type used for :class:`.tubes.remote` and :class:`.tubes.listen` classes"""
def __init__(self, *args, **kwargs):
super(sock, self).__init__(*args, **kwargs)
self.closed = {"recv": False, "send": False}
# Overwritten for better usability
def recvall(self, timeout = tube.forever):
"""recvall() -> str
Receives data until the socket is closed.
"""
if getattr(self, 'type', None) == socket.SOCK_DGRAM:
self.error("UDP sockets does not supports recvall")
else:
return super(sock, self).recvall(timeout)
def recv_raw(self, numb, *a):
if self.closed["recv"]:
raise EOFError
while True:
try:
data = self.sock.recv(numb, *a)
break
except socket.timeout:
return None
except IOError as e:
if e.errno in (errno.EAGAIN, errno.ETIMEDOUT) or 'timed out' in e.strerror:
return None
elif e.errno in (errno.ECONNREFUSED, errno.ECONNRESET):
self.shutdown("recv")
raise EOFError
elif e.errno == errno.EINTR:
continue
else:
raise
if not data:
self.shutdown("recv")
raise EOFError
return data
def send_raw(self, data):
if self.closed["send"]:
raise EOFError
try:
self.sock.sendall(data)
except IOError as e:
eof_numbers = (errno.EPIPE, errno.ECONNRESET, errno.ECONNREFUSED)
if e.errno in eof_numbers or 'Socket is closed' in e.args:
self.shutdown("send")
raise EOFError
else:
raise
def settimeout_raw(self, timeout):
if getattr(self, 'sock', None):
self.sock.settimeout(timeout)
def can_recv_raw(self, timeout):
"""
Tests:
>>> l = listen()
>>> r = remote('localhost', l.lport)
>>> r.can_recv_raw(timeout=0)
False
>>> l.send(b'a')
>>> r.can_recv_raw(timeout=1)
True
>>> r.recv()
b'a'
>>> r.can_recv_raw(timeout=0)
False
>>> l.close()
>>> r.can_recv_raw(timeout=1)
False
>>> r.closed['recv']
True
"""
if not self.sock or self.closed["recv"]:
return False
# select() will tell us data is available at EOF
can_recv = select.select([self.sock], [], [], timeout) == ([self.sock], [], [])
if not can_recv:
return False
# Ensure there's actually data, not just EOF
try:
self.recv_raw(1, socket.MSG_PEEK)
except EOFError:
return False
return True
def connected_raw(self, direction):
"""
Tests:
>>> l = listen()
>>> r = remote('localhost', l.lport)
>>> r.connected()
True
>>> l.close()
>>> time.sleep(0.1) # Avoid race condition
>>> r.connected()
False
"""
# If there's no socket, it's definitely closed
if not self.sock:
return False
# If we have noticed a connection close in a given direction before,
# return fast.
if self.closed.get(direction, False):
return False
# If a connection is closed in all manners, return fast
if all(self.closed.values()):
return False
# Use poll() to determine the connection state
want = {
'recv': select.POLLIN,
'send': select.POLLOUT,
'any': select.POLLIN | select.POLLOUT,
}[direction]
poll = select.poll()
poll.register(self, want | select.POLLHUP | select.POLLERR)
for fd, event in poll.poll(0):
if event & select.POLLHUP:
self.close()
return False
if event & select.POLLIN:
return True
if event & select.POLLOUT:
return True
return True
def close(self):
if not getattr(self, 'sock', None):
return
# Mark as closed in both directions
self.closed['send'] = True
self.closed['recv'] = True
self.sock.close()
self.sock = None
self._close_msg()
def _close_msg(self):
self.info('Closed connection to %s port %d', self.rhost, self.rport)
def fileno(self):
if not self.sock:
self.error("A closed socket does not have a file number")
return self.sock.fileno()
def shutdown_raw(self, direction):
if self.closed[direction]:
return
self.closed[direction] = True
if direction == "send":
try:
self.sock.shutdown(socket.SHUT_WR)
except IOError as e:
if e.errno == errno.ENOTCONN:
pass
else:
raise
if direction == "recv":
try:
self.sock.shutdown(socket.SHUT_RD)
except IOError as e:
if e.errno == errno.ENOTCONN:
pass
else:
raise
if False not in self.closed.values():
self.close()
@classmethod
def _get_family(cls, fam):
if isinstance(fam, six.integer_types):
pass
elif fam == 'any':
fam = socket.AF_UNSPEC
elif fam.lower() in ['ipv4', 'ip4', 'v4', '4']:
fam = socket.AF_INET
elif fam.lower() in ['ipv6', 'ip6', 'v6', '6']:
fam = socket.AF_INET6
else:
self.error("%s(): socket family %r is not supported",
cls.__name__,
fam)
return fam
@classmethod
def _get_type(cls, typ):
if isinstance(typ, six.integer_types):
pass
elif typ == "tcp":
typ = socket.SOCK_STREAM
elif typ == "udp":
typ = socket.SOCK_DGRAM
else:
self.error("%s(): socket type %r is not supported",
cls.__name__,
typ)
return typ