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# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import android_commands
import constants
import logging
import os
import subprocess
import time
class FakeDns(object):
"""Wrapper class for the fake_dns tool."""
_FAKE_DNS_PATH = constants.TEST_EXECUTABLE_DIR + '/fake_dns'
def __init__(self, adb, build_type):
"""
Args:
adb: the AndroidCommands to use.
build_type: 'Release' or 'Debug'.
"""
self._adb = adb
self._build_type = build_type
self._fake_dns = None
self._original_dns = None
def _PushAndStartFakeDns(self):
"""Starts the fake_dns server that replies all name queries 127.0.0.1.
Returns:
subprocess instance connected to the fake_dns process on the device.
"""
self._adb.PushIfNeeded(
os.path.join(constants.CHROME_DIR, 'out', self._build_type, 'fake_dns'),
FakeDns._FAKE_DNS_PATH)
return subprocess.Popen(
['adb', '-s', self._adb._adb.GetSerialNumber(),
'shell', '%s -D' % FakeDns._FAKE_DNS_PATH])
def SetUp(self):
"""Configures the system to point to a DNS server that replies 127.0.0.1.
This can be used in combination with the forwarder to forward all web
traffic to a replay server.
The TearDown() method will perform all cleanup.
"""
self._adb.RunShellCommand('ip route add 8.8.8.0/24 via 127.0.0.1 dev lo')
self._fake_dns = self._PushAndStartFakeDns()
self._original_dns = self._adb.RunShellCommand('getprop net.dns1')[0]
self._adb.RunShellCommand('setprop net.dns1 127.0.0.1')
time.sleep(2) # Time for server to start and the setprop to take effect.
def TearDown(self):
"""Shuts down the fake_dns."""
if self._fake_dns:
if not self._original_dns or self._original_dns == '127.0.0.1':
logging.warning('Bad original DNS, falling back to Google DNS.')
self._original_dns = '8.8.8.8'
self._adb.RunShellCommand('setprop net.dns1 %s' % self._original_dns)
self._fake_dns.kill()
self._adb.RunShellCommand('ip route del 8.8.8.0/24 via 127.0.0.1 dev lo')
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