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#!/usr/bin/python3
# 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.
# pylint: disable=unused-variable
import socket
import time
import pytest
pytest.importorskip("dns", minversion="2.0.0")
import dns.edns
import dns.message
import dns.name
import dns.query
import dns.rdataclass
import dns.rdatatype
import pytest_custom_markers # pylint: disable=import-error
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 timeout():
return time.time() + TIMEOUT
def test_initial_timeout(named_port):
#
# The initial timeout is 2.5 seconds, so this should timeout
#
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
sock.connect(("10.53.0.1", named_port))
time.sleep(3)
msg = create_msg("example.", "A")
with pytest.raises(EOFError):
try:
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
except ConnectionError as e:
raise EOFError from e
def test_idle_timeout(named_port):
#
# The idle timeout is 5 seconds, so the third message should fail
#
msg = create_msg("example.", "A")
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
sock.connect(("10.53.0.1", named_port))
time.sleep(1)
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
time.sleep(2)
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
time.sleep(6)
with pytest.raises(EOFError):
try:
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
except ConnectionError as e:
raise EOFError from e
def test_keepalive_timeout(named_port):
#
# Keepalive is 7 seconds, so the third message should succeed.
#
msg = create_msg("example.", "A")
kopt = dns.edns.GenericOption(11, b"\x00")
msg.use_edns(edns=True, payload=4096, options=[kopt])
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
sock.connect(("10.53.0.1", named_port))
time.sleep(1)
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
time.sleep(2)
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
time.sleep(6)
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
def test_pipelining_timeout(named_port):
#
# The pipelining should only timeout after the last message is received
#
msg = create_msg("example.", "A")
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
sock.connect(("10.53.0.1", named_port))
time.sleep(1)
# Send and receive 25 DNS queries
for n in range(25):
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
for n in range(25):
(response, rtime) = dns.query.receive_tcp(sock, timeout())
time.sleep(3)
# Send and receive 25 DNS queries
for n in range(25):
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
for n in range(25):
(response, rtime) = dns.query.receive_tcp(sock, timeout())
time.sleep(6)
with pytest.raises(EOFError):
try:
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
except ConnectionError as e:
raise EOFError from e
def test_long_axfr(named_port):
#
# The timers should not fire during AXFR, thus the connection should not
# close abruptly
#
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
sock.connect(("10.53.0.1", named_port))
name = dns.name.from_text("example.")
msg = create_msg("example.", "AXFR")
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
# Receive the initial DNS message with SOA
(response, rtime) = dns.query.receive_tcp(
sock, timeout(), one_rr_per_rrset=True
)
soa = response.get_rrset(
dns.message.ANSWER, name, dns.rdataclass.IN, dns.rdatatype.SOA
)
assert soa is not None
# Pull DNS message from wire until the second SOA is received
while True:
(response, rtime) = dns.query.receive_tcp(
sock, timeout(), one_rr_per_rrset=True
)
soa = response.get_rrset(
dns.message.ANSWER, name, dns.rdataclass.IN, dns.rdatatype.SOA
)
if soa is not None:
break
assert soa is not None
# This test relies on the maximum socket send buffer size (wmem_max) being set
# to 212992 bytes (the typical default value on Linux systems). Environments
# that use a different value for this setting (for example, FreeBSD defaults to
# 32768 bytes) may need their system-level settings to be tweaked in order for
# this test to pass.
@pytest_custom_markers.flaky(max_runs=3)
def test_send_timeout(named_port):
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
sock.connect(("10.53.0.1", named_port))
# Send and receive single large RDATA over TCP
msg = create_msg("large.example.", "TXT")
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
# Send and receive 28 large (~32k) DNS queries that should
# fill the default maximum 208k TCP send buffer
for n in range(28):
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
# configure idle interval is 5 seconds, sleep 6 to make sure we are
# above the interval
time.sleep(6)
with pytest.raises(EOFError):
try:
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
except ConnectionError as e:
raise EOFError from e
@pytest_custom_markers.long_test
def test_max_transfer_idle_out(named_port):
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
sock.connect(("10.53.0.1", named_port))
name = dns.name.from_text("example.")
msg = create_msg("example.", "AXFR")
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
# Receive the initial DNS message with SOA
(response, rtime) = dns.query.receive_tcp(
sock, timeout(), one_rr_per_rrset=True
)
soa = response.get_rrset(
dns.message.ANSWER, name, dns.rdataclass.IN, dns.rdatatype.SOA
)
assert soa is not None
time.sleep(61) # max-transfer-idle-out is 1 minute
with pytest.raises(ConnectionResetError):
# Process queued TCP messages
while True:
(response, rtime) = dns.query.receive_tcp(
sock, timeout(), one_rr_per_rrset=True
)
soa = response.get_rrset(
dns.message.ANSWER, name, dns.rdataclass.IN, dns.rdatatype.SOA
)
if soa is not None:
break
assert soa is None
@pytest_custom_markers.long_test
def test_max_transfer_time_out(named_port):
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
sock.connect(("10.53.0.1", named_port))
name = dns.name.from_text("example.")
msg = create_msg("example.", "AXFR")
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
# Receive the initial DNS message with SOA
(response, rtime) = dns.query.receive_tcp(
sock, timeout(), one_rr_per_rrset=True
)
soa = response.get_rrset(
dns.message.ANSWER, name, dns.rdataclass.IN, dns.rdatatype.SOA
)
assert soa is not None
# The loop should timeout at the 5 minutes (max-transfer-time-out)
with pytest.raises(EOFError):
while True:
time.sleep(1)
(response, rtime) = dns.query.receive_tcp(
sock, timeout(), one_rr_per_rrset=True
)
soa = response.get_rrset(
dns.message.ANSWER, name, dns.rdataclass.IN, dns.rdatatype.SOA
)
if soa is not None:
break
assert soa is None
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