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# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
from collections import defaultdict
import dns.message
import dns.query
import dns.rcode
TIMEOUT = 10
def create_msg(qname, qtype):
msg = dns.message.make_query(
qname, qtype, want_dnssec=True, use_edns=0, payload=4096
)
return msg
def udp_query(ip, port, msg):
ans = dns.query.udp(msg, ip, TIMEOUT, port=port)
assert ans.rcode() == dns.rcode.NOERROR
return ans
def tcp_query(ip, port, msg):
ans = dns.query.tcp(msg, ip, TIMEOUT, port=port)
assert ans.rcode() == dns.rcode.NOERROR
return ans
def create_expected(data):
expected = {
"dns-tcp-requests-sizes-received-ipv4": defaultdict(int),
"dns-tcp-responses-sizes-sent-ipv4": defaultdict(int),
"dns-tcp-requests-sizes-received-ipv6": defaultdict(int),
"dns-tcp-responses-sizes-sent-ipv6": defaultdict(int),
"dns-udp-requests-sizes-received-ipv4": defaultdict(int),
"dns-udp-requests-sizes-received-ipv6": defaultdict(int),
"dns-udp-responses-sizes-sent-ipv4": defaultdict(int),
"dns-udp-responses-sizes-sent-ipv6": defaultdict(int),
}
for k, v in data.items():
for kk, vv in v.items():
expected[k][kk] += vv
return expected
def update_expected(expected, key, msg):
msg_len = len(msg.to_wire())
bucket_num = (msg_len // 16) * 16
bucket = "{}-{}".format(bucket_num, bucket_num + 15)
expected[key][bucket] += 1
def check_traffic(data, expected):
def ordered(obj):
if isinstance(obj, dict):
return sorted((k, ordered(v)) for k, v in obj.items())
if isinstance(obj, list):
return sorted(ordered(x) for x in obj)
return obj
ordered_data = ordered(data)
ordered_expected = ordered(expected)
assert len(ordered_data) == 8
assert len(ordered_expected) == 8
assert len(data) == len(ordered_data)
assert len(expected) == len(ordered_expected)
assert ordered_data == ordered_expected
def test_traffic(fetch_traffic, **kwargs):
statsip = kwargs["statsip"]
statsport = kwargs["statsport"]
port = kwargs["port"]
data = fetch_traffic(statsip, statsport)
exp = create_expected(data)
msg = create_msg("short.example.", "TXT")
update_expected(exp, "dns-udp-requests-sizes-received-ipv4", msg)
ans = udp_query(statsip, port, msg)
update_expected(exp, "dns-udp-responses-sizes-sent-ipv4", ans)
data = fetch_traffic(statsip, statsport)
check_traffic(data, exp)
msg = create_msg("long.example.", "TXT")
update_expected(exp, "dns-udp-requests-sizes-received-ipv4", msg)
ans = udp_query(statsip, port, msg)
update_expected(exp, "dns-udp-responses-sizes-sent-ipv4", ans)
data = fetch_traffic(statsip, statsport)
check_traffic(data, exp)
msg = create_msg("short.example.", "TXT")
update_expected(exp, "dns-tcp-requests-sizes-received-ipv4", msg)
ans = tcp_query(statsip, port, msg)
update_expected(exp, "dns-tcp-responses-sizes-sent-ipv4", ans)
data = fetch_traffic(statsip, statsport)
check_traffic(data, exp)
msg = create_msg("long.example.", "TXT")
update_expected(exp, "dns-tcp-requests-sizes-received-ipv4", msg)
ans = tcp_query(statsip, port, msg)
update_expected(exp, "dns-tcp-responses-sizes-sent-ipv4", ans)
data = fetch_traffic(statsip, statsport)
check_traffic(data, exp)
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