X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=resources%2Flibraries%2Fpython%2FPacketVerifier.py;h=978babf7ce5bd6fa4577f50de0e4a5aa56b3d959;hb=HEAD;hp=54f719fa9add6821504eebda84242e8674b2d8e6;hpb=b92a827b1c7f48da4214e992e5503ebe1c182416;p=csit.git diff --git a/resources/libraries/python/PacketVerifier.py b/resources/libraries/python/PacketVerifier.py deleted file mode 100644 index 54f719fa9a..0000000000 --- a/resources/libraries/python/PacketVerifier.py +++ /dev/null @@ -1,306 +0,0 @@ -# Copyright (c) 2016 Cisco and/or its affiliates. -# Licensed under the Apache License, Version 2.0 (the "License"); -# you may not use this file except in compliance with the License. -# You may obtain a copy of the License at: -# -# http://www.apache.org/licenses/LICENSE-2.0 -# -# Unless required by applicable law or agreed to in writing, software -# distributed under the License is distributed on an "AS IS" BASIS, -# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -# See the License for the specific language governing permissions and -# limitations under the License. - -"""PacketVerifier module. - - :Example: - - >>> from scapy.all import * - >>> from PacketVerifier import * - >>> rxq = RxQueue('eth1') - >>> txq = TxQueue('eth1') - >>> src_mac = "AA:BB:CC:DD:EE:FF" - >>> dst_mac = "52:54:00:ca:5d:0b" - >>> src_ip = "11.11.11.10" - >>> dst_ip = "11.11.11.11" - >>> sent_packets = [] - >>> pkt_send = Ether(src=src_mac, dst=dst_mac) / - ... IP(src=src_ip, dst=dst_ip) / - ... ICMP() - >>> sent_packets.append(pkt_send) - >>> txq.send(pkt_send) - >>> pkt_send = Ether(src=src_mac, dst=dst_mac) / - ... ARP(hwsrc=src_mac, psrc=src_ip, hwdst=dst_mac, pdst=dst_ip, op=2) - >>> sent_packets.append(pkt_send) - >>> txq.send(pkt_send) - >>> rxq.recv(100, sent_packets).show() - ###[ Ethernet ]### - dst = aa:bb:cc:dd:ee:ff - src = 52:54:00:ca:5d:0b - type = 0x800 - ###[ IP ]### - version = 4L - ihl = 5L - tos = 0x0 - len = 28 - id = 43183 - flags = - frag = 0L - ttl = 64 - proto = icmp - chksum = 0xa607 - src = 11.11.11.11 - dst = 11.11.11.10 - \options \ - ###[ ICMP ]### - type = echo-reply - code = 0 - chksum = 0xffff - id = 0x0 - seq = 0x0 - ###[ Padding ]### - load = 'RT\x00\xca]\x0b\xaa\xbb\xcc\xdd\xee\xff\x08\x06\x00\x01\x08\x00' - >>> rxq._proc.terminate() -""" - - -import socket -import os -import time -from multiprocessing import Queue, Process -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 - -__all__ = ['RxQueue', 'TxQueue', 'Interface', 'create_gratuitous_arp_request', - 'auto_pad'] - -# TODO: http://stackoverflow.com/questions/320232/ensuring-subprocesses-are-dead-on-exiting-python-program - -class PacketVerifier(object): - """Base class for TX and RX queue objects for packet verifier.""" - def __init__(self, interface_name): - 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)) - - -def extract_one_packet(buf): - """Extract one packet from the incoming buf buffer. - - Takes string as input and looks for first whole packet in it. - If it finds one, it returns substring from the buf parameter. - - :param buf: string representation of incoming packet buffer. - :type buf: string - :return: String representation of first packet in buf. - :rtype: string - """ - 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: - raise RuntimeError( - 'No EtherType in packet {0}'.format(buf.__repr__())) - - if ether_type == ETH_P_IP: - # 14 is Ethernet fame header size. - # 4 bytes is just enough to look for length in ip header. - # ip total length contains just the IP packet length so add the Ether - # header. - pkt_len = Ether(buf[0:14+4]).len + 14 - if len(buf) < 60: - return None - elif ether_type == ETH_P_IPV6: - if not Ether(buf[0:14+6]).haslayer(IPv6): - raise RuntimeError( - 'Invalid IPv6 packet {0}'.format(buf.__repr__())) - # ... to add to the above, 40 bytes is the length of IPV6 header. - # The ipv6.len only contains length of the payload and not the header - pkt_len = Ether(buf)['IPv6'].plen + 14 + 40 - if len(buf) < 60: - return None - elif ether_type == ETH_P_ARP: - pkt = Ether(buf[:20]) - if not pkt.haslayer(ARP): - raise RuntimeError('Incomplete ARP packet') - # len(eth) + arp(2 hw addr type + 2 proto addr type - # + 1b len + 1b len + 2b operation) - - pkt_len = 14 + 8 - pkt_len += 2 * pkt.getlayer(ARP).hwlen - pkt_len += 2 * pkt.getlayer(ARP).plen - - del pkt - elif ether_type == 32821: # RARP (Reverse ARP) - pkt = Ether(buf[:20]) - pkt.type = ETH_P_ARP # Change to ARP so it works with scapy - pkt = Ether(str(pkt)) - if not pkt.haslayer(ARP): - pkt.show() - raise RuntimeError('Incomplete RARP packet') - - # len(eth) + arp(2 hw addr type + 2 proto addr type - # + 1b len + 1b len + 2b operation) - pkt_len = 14 + 8 - pkt_len += 2 * pkt.getlayer(ARP).hwlen - pkt_len += 2 * pkt.getlayer(ARP).plen - - del pkt - else: - raise RuntimeError('Unknown protocol {0}'.format(ether_type)) - - if pkt_len < 60: - pkt_len = 60 - - if len(buf) < pkt_len: - return None - - return buf[0:pkt_len] - - -def packet_reader(interface_name, queue): - """Sub-process routine that reads packets and puts them to queue. - - This function is meant to be run in separate subprocess and is in tight - loop reading raw packets from interface passed as parameter. - - :param interace_name: Name of interface to read packets from. - :param queue: Queue in which this function will push incoming packets. - :type interface_name: string - :type queue: multiprocessing.Queue - :return: None - """ - sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, ETH_P_ALL) - sock.bind((interface_name, ETH_P_ALL)) - - buf = "" - while True: - recvd = sock.recv(1514) - buf = buf + recvd - - pkt = extract_one_packet(buf) - while pkt is not None: - if pkt is None: - break - queue.put(pkt) - buf = buf[len(pkt):] - pkt = extract_one_packet(buf) - - -class RxQueue(PacketVerifier): - """Receive queue object. - - This object creates raw socket, reads packets from it and provides - function to access them. - - :param interface_name: Which interface to bind to. - :type interface_name: string - """ - - def __init__(self, interface_name): - PacketVerifier.__init__(self, interface_name) - - self._queue = Queue() - self._proc = Process(target=packet_reader, args=(interface_name, - self._queue)) - self._proc.daemon = True - self._proc.start() - time.sleep(2) - - def recv(self, timeout=3, ignore=None): - """Read next received packet. - - Returns scapy's Ether() object created from next packet in the queue. - Queue is being filled in parallel in subprocess. If no packet - arrives in given timeout queue.Empty exception will be risen. - - :param timeout: How many seconds to wait for next packet. - :type timeout: int - - :return: Ether() initialized object from packet data. - :rtype: scapy.Ether - """ - - pkt = self._queue.get(True, timeout=timeout) - - 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: - # 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) - - return Ether(pkt) - - -class TxQueue(PacketVerifier): - """Transmission queue object. - - This object is used to send packets over RAW socket on a interface. - - :param interface_name: Which interface to send packets from. - :type interface_name: string - """ - def __init__(self, interface_name): - PacketVerifier.__init__(self, interface_name) - - def send(self, pkt): - """Send packet out of the bound interface. - - :param pkt: Packet to send. - :type pkt: string or scapy Packet derivative. - """ - if isinstance(pkt, Packet): - pkt = str(pkt) - pkt = auto_pad(pkt) - self._sock.send(pkt) - - -class Interface(object): - def __init__(self, if_name): - self.if_name = if_name - self.sent_packets = [] - self.txq = TxQueue(if_name) - self.rxq = RxQueue(if_name) - - def send_pkt(self, pkt): - self.sent_packets.append(pkt) - self.txq.send(pkt) - - def recv_pkt(self, timeout=3): - return self.rxq.recv(timeout, self.sent_packets) - - def close(self): - self.rxq._proc.terminate() - - -def create_gratuitous_arp_request(src_mac, src_ip): - """Creates scapy representation of gratuitous ARP request""" - return (Ether(src=src_mac, dst='ff:ff:ff:ff:ff:ff') / - ARP(psrc=src_ip, hwsrc=src_mac, pdst=src_ip)) - - -def auto_pad(packet): - """Pads zeroes at the end of the packet if the total len < 60 bytes.""" - padded = str(packet) - if len(padded) < 60: - padded += ('\0' * (60 - len(padded))) - return padded -