| Chip Boling | f5af85d | 2019-02-12 15:36:17 -0600 | [diff] [blame] | 1 | # Copyright 2017-present Adtran, Inc. |
| 2 | # |
| 3 | # Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | # you may not use this file except in compliance with the License. |
| 5 | # You may obtain a copy of the License at |
| 6 | # |
| 7 | # http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | # |
| 9 | # Unless required by applicable law or agreed to in writing, software |
| 10 | # distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | # See the License for the specific language governing permissions and |
| 13 | # limitations under the License. |
| 14 | |
| 15 | import structlog |
| 16 | from twisted.internet.defer import Deferred, succeed |
| 17 | from twisted.internet.protocol import Factory, Protocol |
| 18 | from twisted.conch.client.knownhosts import ConsoleUI, KnownHostsFile |
| 19 | from twisted.conch.endpoints import SSHCommandClientEndpoint |
| 20 | from twisted.internet import reactor |
| 21 | |
| 22 | log = structlog.get_logger() |
| 23 | _open = open |
| 24 | |
| 25 | |
| 26 | class RCmd(object): |
| 27 | """ |
| 28 | Execute a one-time remote command via SSH |
| 29 | """ |
| 30 | def __init__(self, host, username, password, |
| 31 | command, |
| 32 | port=None, |
| 33 | keys=None, |
| 34 | known_hosts=None, |
| 35 | agent=None): |
| 36 | self.reactor = reactor |
| 37 | self.host = host |
| 38 | self.port = port |
| 39 | self.username = username |
| 40 | self.password = password |
| 41 | self.keys = keys |
| 42 | # self.knownHosts = known_hosts |
| 43 | self.knownHosts = known_hosts |
| 44 | self.agent = agent |
| 45 | self.command = command |
| 46 | self.ui = RCmd.FixedResponseUI(True) |
| 47 | |
| 48 | class NoiseProtocol(Protocol): |
| 49 | def __init__(self): |
| 50 | self.finished = Deferred() |
| 51 | self.strings = ["bif", "pow", "zot"] |
| 52 | |
| 53 | def connectionMade(self): |
| 54 | log.debug('connection-made') |
| 55 | self._send_noise() |
| 56 | |
| 57 | def _send_noise(self): |
| 58 | if self.strings: |
| 59 | self.transport.write(self.strings.pop(0) + "\n") |
| 60 | else: |
| 61 | self.transport.loseConnection() |
| 62 | |
| 63 | def dataReceived(self, data): |
| 64 | log.debug('rx', data=data) |
| 65 | if self.finished is not None and not self.finished.called: |
| 66 | self.finished.callback(data) |
| 67 | self._send_noise() |
| 68 | |
| 69 | def connectionLost(self, reason): |
| 70 | log.debug('connection-lost') |
| 71 | if not self.finished.called: |
| 72 | self.finished.callback(reason) |
| 73 | |
| 74 | class PermissiveKnownHosts(KnownHostsFile): |
| 75 | def verifyHostKey(self, ui, hostname, ip, key): |
| 76 | log.debug('verifyHostKey') |
| 77 | return True |
| 78 | |
| 79 | class FixedResponseUI(ConsoleUI): |
| 80 | def __init__(self, result): |
| 81 | super(RCmd.FixedResponseUI, self).__init__(lambda: _open("/dev/null", |
| 82 | "r+b", |
| 83 | buffering=0)) |
| 84 | self.result = result |
| 85 | |
| 86 | def prompt(self, _): |
| 87 | log.debug('prompt') |
| 88 | return succeed(True) |
| 89 | |
| 90 | def warn(self, text): |
| 91 | log.debug('warn') |
| 92 | pass |
| 93 | |
| 94 | def _endpoint_for_command(self, command): |
| 95 | return SSHCommandClientEndpoint.newConnection( |
| 96 | self.reactor, command, self.username, self.host, |
| 97 | port=self.port, |
| 98 | password=self.password, |
| 99 | keys=self.keys, |
| 100 | agentEndpoint=self.agent, |
| 101 | knownHosts=self.knownHosts, |
| 102 | ui=self.ui |
| 103 | ) |
| 104 | |
| 105 | def execute(self): |
| 106 | endpoint = self._endpoint_for_command(self.command) |
| 107 | factory = Factory() |
| 108 | factory.protocol = RCmd.NoiseProtocol |
| 109 | |
| 110 | d = endpoint.connect(factory) |
| 111 | d.addCallback(lambda proto: proto.finished) |
| 112 | return d |