How to use scapy - 10 common examples

def _legacy_sign_md5_sha1(self, M):
        M = bytes_encode(M)
        k = self._modulusLen // 8
        EM = _legacy_pkcs1_v1_5_encode_md5_sha1(M, k)
        if EM is None:
            warning("Key._rsassa_pkcs1_v1_5_sign(): unable to encode")
            return None
        m = pkcs_os2ip(EM)
        n = self._modulus
        if isinstance(m, int) and six.PY2:
            m = long(m)  # noqa: F821
        if (six.PY2 and not isinstance(m, long)) or m > n - 1:  # noqa: F821
            warning("Key._rsaep() expects a long between 0 and n-1")
            return None
        privExp = self.key.private_numbers().d
        s = pow(m, privExp, n)
        return pkcs_i2osp(s, k)

def create_packet(self, src_if, dst_if, do_dot1=True):
        packet_sizes = [64, 512, 1518, 9018]
        dst_host = random.choice(self.hosts_by_pg_idx[dst_if.sw_if_index])
        src_host = random.choice(self.hosts_by_pg_idx[src_if.sw_if_index])
        pkt_info = self.create_packet_info(src_if, dst_if)
        payload = self.info_to_payload(pkt_info)
        p = (Ether(dst=dst_host.mac, src=src_host.mac) /
             IP(src=src_host.ip4, dst=dst_host.ip4) /
             UDP(sport=1234, dport=1234) /
             Raw(payload))
        pkt_info.data = p.copy()
        if do_dot1 and hasattr(src_if, 'sub_if'):
            p = src_if.sub_if.add_dot1_layer(p)
        size = random.choice(packet_sizes)
        self.extend_packet(p, size)
        return p

#
        # set the directed broadcast on pg0 first, then config IP4 addresses
        # for pg1 directed broadcast is always disabled
        self.vapi.sw_interface_set_ip_directed_broadcast(
            self.pg0.sw_if_index, 1)

        p0 = (Ether(src=self.pg1.remote_mac,
                    dst=self.pg1.local_mac) /
              IP(src="1.1.1.1",
                 dst=self.pg0._local_ip4_bcast) /
              UDP(sport=1234, dport=1234) /
              Raw(b'\xa5' * 2000))
        p1 = (Ether(src=self.pg0.remote_mac,
                    dst=self.pg0.local_mac) /
              IP(src="1.1.1.1",
                 dst=self.pg1._local_ip4_bcast) /
              UDP(sport=1234, dport=1234) /
              Raw(b'\xa5' * 2000))

        self.pg0.config_ip4()
        self.pg0.resolve_arp()
        self.pg1.config_ip4()
        self.pg1.resolve_arp()

        #
        # test packet is L2 broadcast
        #
        rx = self.send_and_expect(self.pg1, p0 * NUM_PKTS, self.pg0)
        self.assertTrue(rx[0][Ether].dst, "ff:ff:ff:ff:ff:ff")

        self.send_and_assert_no_replies(self.pg0, p1 * NUM_PKTS,

def modify_packet(self, src_if, packet_size, pkt):
        """Add load, set destination IP and extend packet to required packet
        size for defined interface.

        :param VppInterface src_if: Interface to create packet for.
        :param int packet_size: Required packet size.
        :param Scapy pkt: Packet to be modified.
        """
        dst_if_idx = int(packet_size / 10 % 2)
        dst_if = self.flows[src_if][dst_if_idx]
        info = self.create_packet_info(src_if, dst_if)
        payload = self.info_to_payload(info)
        p = pkt/Raw(payload)
        p[IP].dst = dst_if.remote_ip4
        info.data = p.copy()
        if isinstance(src_if, VppSubInterface):
            p = src_if.add_dot1_layer(p)
        self.extend_packet(p, packet_size)

        return p

nh_table_id=1)])
        route_to_src = VppIpRoute(self, "1.1.1.2", 32,
                                  [VppRoutePath("0.0.0.0",
                                                0xffffffff,
                                                nh_table_id=2,
                                                is_source_lookup=1)])
        route_to_dst.add_vpp_config()
        route_to_src.add_vpp_config()

        #
        # packets to these destination are dropped, since they'll
        # hit the respective default routes in the second table
        #
        p_dst = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IP(src="5.5.5.5", dst="1.1.1.1") /
                 TCP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))
        p_src = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IP(src="2.2.2.2", dst="1.1.1.2") /
                 TCP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))
        pkts_dst = p_dst * 257
        pkts_src = p_src * 257

        self.send_and_assert_no_replies(self.pg0, pkts_dst,
                                        "IP in dst table")
        self.send_and_assert_no_replies(self.pg0, pkts_src,
                                        "IP in src table")

        #

def send_frames(payload_len, dump_size, dump_filename):
    """ Send frames function

    send the frames.

    """
    for int_iterator in range(dump_size):
        l2_header = Ether(src="00:11:22:33:44:55", dst="55:44:33:22:11")
        l3_header = IP(src="192.168.1.1", dst="192.168.1.2", id=int_iterator)
        payload = Raw(make_payload(
            PAYLOAD_SEED,
            payload_len.rand_payload_len(),
            len(l3_header)))
        pkt = l2_header / l3_header / payload
        sendp(pkt, iface=dump_filename, verbose=False)
        if int_iterator % 100 == 0:
            print "... " + str(int_iterator) + " packets sent..."

ARP(op="who-has",
                 hwsrc=self.pg0.remote_mac,
                 pdst=self.pg1.local_ip4,
                 psrc=self.pg1.remote_ip4))
        self.send_and_assert_no_replies(self.pg0, p,
                                        "ARP req diff sub-net")
        self.assertFalse(find_nbr(self,
                                  self.pg0.sw_if_index,
                                  self.pg1.remote_ip4))

        #
        #  2 - don't respond to ARP request from an address not within the
        #      interface's sub-net
        #   2b - to a proxied address
        #   2c - not within a different interface's sub-net
        p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg0.remote_mac) /
             ARP(op="who-has",
                 hwsrc=self.pg0.remote_mac,
                 psrc="10.10.10.3",
                 pdst=self.pg0.local_ip4))
        self.send_and_assert_no_replies(self.pg0, p,
                                        "ARP req for non-local source")
        p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg2.remote_mac) /
             ARP(op="who-has",
                 hwsrc=self.pg2.remote_mac,
                 psrc="10.10.10.3",
                 pdst=self.pg0.local_ip4))
        self.send_and_assert_no_replies(
            self.pg0, p,
            "ARP req for non-local source - unnum")
        p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg0.remote_mac) /
             ARP(op="who-has",

def create_tunnel_stream_4o4(self, src_if,
                                 tunnel_src, tunnel_dst,
                                 src_ip, dst_ip):
        pkts = []
        for i in range(0, 257):
            info = self.create_packet_info(src_if, src_if)
            payload = self.info_to_payload(info)
            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
                 IP(src=tunnel_src, dst=tunnel_dst) /
                 GRE() /
                 IP(src=src_ip, dst=dst_ip) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            pkts.append(p)
        return pkts

def compare_rx_tx_packet_End_AD_L2_out(self, tx_pkt, rx_pkt):
        """ Compare input and output packet after passing End.AD with L2

        :param tx_pkt: transmitted packet
        :param rx_pkt: received packet
        """

        # get IPv4 header of rx'ed packet
        rx_eth = rx_pkt.getlayer(Ether)

        tx_ip = tx_pkt.getlayer(IPv6)
        # we can't just get the 2nd Ether layer
        # get the Raw content and dissect it as Ether
        tx_eth1 = Ether(scapy.compat.raw(tx_pkt[Raw]))

        # verify if rx'ed packet has no SRH
        self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))

        # the whole rx_eth pkt should be equal to tx_eth1
        self.assertEqual(rx_eth, tx_eth1)

        self.logger.debug("packet verification: SUCCESS")

# epg is not learnt, becasue the EPG is unknwon
        self.assertEqual(len(self.vapi.gbp_endpoint_dump()), 1)

        #
        # Learn new EPs from IP packets
        #
        for ii, l in enumerate(learnt):
            # a packet with an sclass from a knwon EPG
            # arriving on an unknown TEP
            p = (Ether(src=self.pg2.remote_mac,
                       dst=self.pg2.local_mac) /
                 IP(src=self.pg2.remote_hosts[1].ip4,
                    dst=self.pg2.local_ip4) /
                 UDP(sport=1234, dport=48879) /
                 VXLAN(vni=99, gpid=112, flags=0x88) /
                 Ether(src=l['mac'], dst=ep.mac) /
                 IP(src=l['ip'], dst=ep.ip4.address) /
                 UDP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))

            rx = self.send_and_expect(self.pg2, [p], self.pg0)

            # the new TEP
            tep1_sw_if_index = find_vxlan_gbp_tunnel(
                self,
                self.pg2.local_ip4,
                self.pg2.remote_hosts[1].ip4,
                99)
            self.assertNotEqual(INDEX_INVALID, tep1_sw_if_index)

            #
            # the EP is learnt via the learnt TEP