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#
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (c) 2023 Rubicon Communications, LLC (Netgate)
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
import pytest
from atf_python.sys.net.tools import ToolsHelper
from atf_python.sys.net.vnet import VnetTestTemplate
import os
import socket
import struct
import sys
import logging
logging.getLogger("scapy").setLevel(logging.CRITICAL)
curdir = os.path.dirname(os.path.realpath(__file__))
netpfil_common = curdir + "/../netpfil/common"
sys.path.append(netpfil_common)
sc = None
sp = None
def check_igmpv3(args, pkt):
igmp = pkt.getlayer(sc.igmpv3.IGMPv3)
if igmp is None:
return False
igmpmr = pkt.getlayer(sc.igmpv3.IGMPv3mr)
if igmpmr is None:
return False
for r in igmpmr.records:
if r.maddr != args["group"]:
return False
if args["type"] == "join":
if r.rtype != 4:
return False
elif args["type"] == "leave":
if r.rtype != 3:
return False
r.show()
return True
def check_igmpv2(args, pkt):
pkt.show()
igmp = pkt.getlayer(sc.igmp.IGMP)
if igmp is None:
return False
if igmp.gaddr != args["group"]:
return False
if args["type"] == "join":
if igmp.type != 0x16:
return False
if args["type"] == "leave":
if igmp.type != 0x17:
return False
return True
class TestIGMP(VnetTestTemplate):
REQUIRED_MODULES = []
TOPOLOGY = {
"vnet1": { "ifaces": [ "if1" ] },
"if1": { "prefixes4": [ ("192.0.2.1/24", "192.0.2.2/24" ) ] },
}
def setup_method(self, method):
global sc
if sc is None:
import scapy.contrib as _sc
import scapy.contrib.igmp
import scapy.contrib.igmpv3
import scapy.all as _sp
sc = _sc
sp = _sp
super().setup_method(method)
@pytest.mark.require_progs(["scapy"])
def test_igmp3_join_leave(self):
"Test that we send the expected join/leave IGMPv3 messages"
if1 = self.vnet.iface_alias_map["if1"]
# Start a background sniff
from sniffer import Sniffer
expected_pkt = { "type": "join", "group": "230.0.0.1" }
sniffer = Sniffer(expected_pkt, check_igmpv3, if1.name, timeout=10)
# Now join a multicast group, and see if we're getting the igmp packet we expect
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
mreq = struct.pack("4sl", socket.inet_aton('230.0.0.1'), socket.INADDR_ANY)
s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
# Wait for the sniffer to see the join packet
sniffer.join()
assert(sniffer.correctPackets > 0)
# Now leave, check for the packet
expected_pkt = { "type": "leave", "group": "230.0.0.1" }
sniffer = Sniffer(expected_pkt, check_igmpv3, if1.name)
s.close()
sniffer.join()
assert(sniffer.correctPackets > 0)
@pytest.mark.require_progs(["scapy"])
def test_igmp2_join_leave(self):
"Test that we send the expected join/leave IGMPv2 messages"
ToolsHelper.print_output("/sbin/sysctl net.inet.igmp.default_version=2")
if1 = self.vnet.iface_alias_map["if1"]
# Start a background sniff
from sniffer import Sniffer
expected_pkt = { "type": "join", "group": "230.0.0.1" }
sniffer = Sniffer(expected_pkt, check_igmpv2, if1.name, timeout=10)
# Now join a multicast group, and see if we're getting the igmp packet we expect
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
mreq = struct.pack("4sl", socket.inet_aton('230.0.0.1'), socket.INADDR_ANY)
s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
# Wait for the sniffer to see the join packet
sniffer.join()
assert(sniffer.correctPackets > 0)
# Now leave, check for the packet
expected_pkt = { "type": "leave", "group": "230.0.0.1" }
sniffer = Sniffer(expected_pkt, check_igmpv2, if1.name)
s.close()
sniffer.join()
assert(sniffer.correctPackets > 0)
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