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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):
sock = getattr(self, 'sock', None)
if sock:
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):
sock = getattr(self, 'sock', None)
if not sock:
return
# Mark as closed in both directions
self.closed['send'] = True
self.closed['recv'] = True
sock.close()
self.sock = None
self._close_msg()
def _close_msg(self):
self.info('Closed connection to %s port %s', 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
|
