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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
# Copyright (c) 2021 by
# Donatas Abraitis <donatas.abraitis@gmail.com>
#
"""
Test if BGP connection is established if at least one peer
sets `dont-capability-negotiate`.
"""
import os
import sys
import json
import pytest
import functools
pytestmark = pytest.mark.bgpd
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))
# pylint: disable=C0413
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
from lib.common_config import step
pytestmark = [pytest.mark.bgpd]
def setup_module(mod):
topodef = {"s1": ("r1", "r2")}
tgen = Topogen(topodef, mod.__name__)
tgen.start_topology()
router_list = tgen.routers()
for i, (rname, router) in enumerate(router_list.items(), 1):
router.load_config(
TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
)
router.load_config(
TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
)
tgen.start_router()
def teardown_module(mod):
tgen = get_topogen()
tgen.stop_topology()
def bgp_converge(router):
output = json.loads(router.vtysh_cmd("show bgp ipv4 unicast summary json"))
expected = {
"peers": {
"192.168.1.2": {
"pfxRcd": 2,
"pfxSnt": 2,
"state": "Established",
"peerState": "OK",
}
}
}
return topotest.json_cmp(output, expected)
def test_bgp_dont_capability_negotiate():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
r1 = tgen.gears["r1"]
test_func = functools.partial(bgp_converge, r1)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Can't converge with dont-capability-negotiate"
def test_bgp_check_fqdn():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
r1 = tgen.gears["r1"]
r2 = tgen.gears["r2"]
def _bgp_check_fqdn(fqdn=None):
output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast 172.16.16.1/32 json"))
expected = {
"paths": [
{
"nexthops": [
{
"hostname": fqdn,
}
],
"peer": {
"hostname": fqdn,
},
}
]
}
return topotest.json_cmp(output, expected)
step("Enable all capabilities")
r1.vtysh_cmd(
"""
configure terminal
router bgp
address-family ipv4 unicast
no neighbor 192.168.1.2 dont-capability-negotiate
end
clear bgp 192.168.1.2
"""
)
step("Wait to converge")
test_func = functools.partial(bgp_converge, r1)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Can't converge with dont-capability-negotiate"
test_func = functools.partial(_bgp_check_fqdn, "r2")
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "FQDN capability enabled, but r1 can't see it"
step("Disable sending any capabilities from r2")
r2.vtysh_cmd(
"""
configure terminal
router bgp
address-family ipv4 unicast
neighbor 192.168.1.1 dont-capability-negotiate
end
clear bgp 192.168.1.1
"""
)
step("Wait to converge")
test_func = functools.partial(bgp_converge, r1)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "Can't converge with dont-capability-negotiate"
step("Make sure FQDN capability is reset")
test_func = functools.partial(_bgp_check_fqdn)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "FQDN capability disabled, but we still have a hostname"
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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