chksum = 0xa607
src = 11.11.11.11
dst = 11.11.11.10
- \options \
+ options
###[ ICMP ]###
type = echo-reply
code = 0
load = 'RT\x00\xca]\x0b\xaa\xbb\xcc\xdd\xee\xff\x08\x06\x00\x01\x08\x00'
"""
-
import os
-import socket
import select
+import interruptingcow
+from scapy.config import conf
from scapy.all import ETH_P_IP, ETH_P_IPV6, ETH_P_ALL, ETH_P_ARP
-from scapy.all import Ether, ARP, Packet
from scapy.layers.inet6 import IPv6
+from scapy.layers.l2 import Ether, ARP
+
+# Enable libpcap's L2listen
+conf.use_pcap = True
+import scapy.arch.pcapdnet # pylint: disable=C0413, unused-import
__all__ = ['RxQueue', 'TxQueue', 'Interface', 'create_gratuitous_arp_request',
'auto_pad', 'checksum_equal']
-# TODO: http://stackoverflow.com/questions/320232/ensuring-subprocesses-are-dead-on-exiting-python-program
+# TODO: http://stackoverflow.com/questions/320232/
+# ensuring-subprocesses-are-dead-on-exiting-python-program
class PacketVerifier(object):
os.system('sudo echo 1 > /proc/sys/net/ipv6/conf/{0}/disable_ipv6'
.format(interface_name))
os.system('sudo ip link set {0} up promisc on'.format(interface_name))
- self._sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW,
- ETH_P_ALL)
- self._sock.bind((interface_name, ETH_P_ALL))
self._ifname = interface_name
:param buf: String representation of incoming packet buffer.
:type buf: str
- :return: String representation of first packet in buf.
+ :returns: String representation of first packet in buf.
:rtype: str
"""
pkt_len = 0
if len(buf) < 60:
return None
- # print
- # print buf.__repr__()
- # print Ether(buf).__repr__()
- # print len(Ether(buf))
- # print
try:
ether_type = Ether(buf[0:14]).type
except AttributeError:
:param queue: Queue in which this function will push incoming packets.
:type interface_name: str
:type queue: multiprocessing.Queue
- :return: None
+ :returns: None
"""
- sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, ETH_P_ALL)
- sock.bind((interface_name, ETH_P_ALL))
+ sock = conf.L2listen(iface=interface_name, type=ETH_P_ALL)
while True:
pkt = sock.recv(0x7fff)
"""
def __init__(self, interface_name):
PacketVerifier.__init__(self, interface_name)
+ self._sock = conf.L2listen(iface=interface_name, type=ETH_P_ALL)
def recv(self, timeout=3, ignore=None, verbose=True):
"""Read next received packet.
:type ignore: list
:type verbose: bool
- :return: Ether() initialized object from packet data.
+ :returns: Ether() initialized object from packet data.
:rtype: scapy.Ether
"""
(rlist, _, _) = select.select([self._sock], [], [], timeout)
if self._sock not in rlist:
return None
-
- pkt = self._sock.recv(0x7fff)
- pkt_pad = auto_pad(pkt)
- print 'Received packet on {0} of len {1}'.format(self._ifname, len(pkt))
- if verbose:
- Ether(pkt).show2()
- print
-
- if ignore is not None:
- for i, ig_pkt in enumerate(ignore):
- # Auto pad all packets in ignore list
- ignore[i] = auto_pad(ig_pkt)
- for ig_pkt in ignore:
- if ig_pkt == pkt_pad:
- # Found the packet in ignore list, get another one
- # TODO: subtract timeout - time_spent in here
- ignore.remove(ig_pkt)
- return self.recv(timeout, ignore, verbose)
-
- return Ether(pkt)
+ try:
+ with interruptingcow.timeout(timeout,
+ exception=RuntimeError('Timeout')):
+ ignore_list = list()
+ if ignore is not None:
+ for ig_pkt in ignore:
+ # Auto pad all packets in ignore list
+ ignore_list.append(auto_pad(ig_pkt))
+ while True:
+ pkt = self._sock.recv(0x7fff)
+ pkt_pad = auto_pad(pkt)
+ print 'Received packet on {0} of len {1}'\
+ .format(self._ifname, len(pkt))
+ if verbose:
+ pkt.show2() # pylint: disable=no-member
+ print
+ if pkt_pad in ignore_list:
+ ignore_list.remove(pkt_pad)
+ print 'Received packet ignored.'
+ continue
+ else:
+ return pkt
+ except RuntimeError:
+ return None
class TxQueue(PacketVerifier):
"""
def __init__(self, interface_name):
PacketVerifier.__init__(self, interface_name)
+ self._sock = conf.L2socket(iface=interface_name, type=ETH_P_ALL)
def send(self, pkt, verbose=True):
"""Send packet out of the bound interface.
class Interface(object):
+ """Class for network interfaces. Contains methods for sending and receiving
+ packets."""
def __init__(self, if_name):
+ """Initialize the interface class.
+
+ :param if_name: Name of the interface.
+ :type if_name: str
+ """
self.if_name = if_name
self.sent_packets = []
self.rxq = RxQueue(if_name)
self.txq = TxQueue(if_name)
def send_pkt(self, pkt):
+ """Send the provided packet out the interface."""
self.sent_packets.append(pkt)
self.txq.send(pkt)
def recv_pkt(self, timeout=3):
+ """Read one packet from the interface's receive queue.
+
+ :param timeout: Timeout value in seconds.
+ :type timeout: int
+ :returns: Ether() initialized object from packet data.
+ :rtype: scapy.Ether
+ """
return self.rxq.recv(timeout, self.sent_packets)
:type chksum1: uint16
:type chksum2: uint16
- :return: True if checksums are equivalent, False otherwise.
+ :returns: True if checksums are equivalent, False otherwise.
:rtype: boolean
"""
if chksum1 == 0xFFFF:
Code Review / csit.git / blobdiff