| 1 | # -*- test-case-name: twisted.conch.test.test_conch -*- |
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| 2 | # |
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| 3 | # Copyright (c) Twisted Matrix Laboratories. |
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| 4 | # See LICENSE for details. |
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| 5 | |
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| 6 | # |
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| 7 | # $Id: conch.py,v 1.65 2004/03/11 00:29:14 z3p Exp $ |
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| 8 | |
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| 9 | #""" Implementation module for the `conch` command. |
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| 10 | #""" |
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| 11 | from twisted.conch.client import connect, default, options |
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| 12 | from twisted.conch.error import ConchError |
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| 13 | from twisted.conch.ssh import connection, common |
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| 14 | from twisted.conch.ssh import session, forwarding, channel |
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| 15 | from twisted.internet import reactor, stdio, task |
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| 16 | from twisted.python import log, usage |
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| 17 | |
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| 18 | import os, sys, getpass, struct, tty, fcntl, signal |
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| 19 | |
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| 20 | class ClientOptions(options.ConchOptions): |
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| 21 | |
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| 22 | synopsis = """Usage: conch [options] host [command] |
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| 23 | """ |
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| 24 | longdesc = ("conch is a SSHv2 client that allows logging into a remote " |
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| 25 | "machine and executing commands.") |
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| 26 | |
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| 27 | optParameters = [['escape', 'e', '~'], |
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| 28 | ['localforward', 'L', None, 'listen-port:host:port Forward local port to remote address'], |
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| 29 | ['remoteforward', 'R', None, 'listen-port:host:port Forward remote port to local address'], |
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| 30 | ] |
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| 31 | |
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| 32 | optFlags = [['null', 'n', 'Redirect input from /dev/null.'], |
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| 33 | ['fork', 'f', 'Fork to background after authentication.'], |
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| 34 | ['tty', 't', 'Tty; allocate a tty even if command is given.'], |
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| 35 | ['notty', 'T', 'Do not allocate a tty.'], |
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| 36 | ['noshell', 'N', 'Do not execute a shell or command.'], |
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| 37 | ['subsystem', 's', 'Invoke command (mandatory) as SSH2 subsystem.'], |
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| 38 | ] |
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| 39 | |
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| 40 | compData = usage.Completions( |
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| 41 | mutuallyExclusive=[("tty", "notty")], |
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| 42 | optActions={ |
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| 43 | "localforward": usage.Completer(descr="listen-port:host:port"), |
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| 44 | "remoteforward": usage.Completer(descr="listen-port:host:port")}, |
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| 45 | extraActions=[usage.CompleteUserAtHost(), |
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| 46 | usage.Completer(descr="command"), |
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| 47 | usage.Completer(descr="argument", repeat=True)] |
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| 48 | ) |
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| 49 | |
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| 50 | localForwards = [] |
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| 51 | remoteForwards = [] |
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| 52 | |
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| 53 | def opt_escape(self, esc): |
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| 54 | "Set escape character; ``none'' = disable" |
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| 55 | if esc == 'none': |
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| 56 | self['escape'] = None |
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| 57 | elif esc[0] == '^' and len(esc) == 2: |
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| 58 | self['escape'] = chr(ord(esc[1])-64) |
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| 59 | elif len(esc) == 1: |
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| 60 | self['escape'] = esc |
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| 61 | else: |
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| 62 | sys.exit("Bad escape character '%s'." % esc) |
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| 63 | |
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| 64 | def opt_localforward(self, f): |
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| 65 | "Forward local port to remote address (lport:host:port)" |
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| 66 | localPort, remoteHost, remotePort = f.split(':') # doesn't do v6 yet |
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| 67 | localPort = int(localPort) |
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| 68 | remotePort = int(remotePort) |
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| 69 | self.localForwards.append((localPort, (remoteHost, remotePort))) |
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| 70 | |
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| 71 | def opt_remoteforward(self, f): |
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| 72 | """Forward remote port to local address (rport:host:port)""" |
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| 73 | remotePort, connHost, connPort = f.split(':') # doesn't do v6 yet |
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| 74 | remotePort = int(remotePort) |
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| 75 | connPort = int(connPort) |
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| 76 | self.remoteForwards.append((remotePort, (connHost, connPort))) |
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| 77 | |
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| 78 | def parseArgs(self, host, *command): |
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| 79 | self['host'] = host |
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| 80 | self['command'] = ' '.join(command) |
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| 81 | |
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| 82 | # Rest of code in "run" |
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| 83 | options = None |
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| 84 | conn = None |
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| 85 | exitStatus = 0 |
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| 86 | old = None |
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| 87 | _inRawMode = 0 |
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| 88 | _savedRawMode = None |
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| 89 | |
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| 90 | def run(): |
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| 91 | global options, old |
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| 92 | args = sys.argv[1:] |
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| 93 | if '-l' in args: # cvs is an idiot |
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| 94 | i = args.index('-l') |
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| 95 | args = args[i:i+2]+args |
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| 96 | del args[i+2:i+4] |
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| 97 | for arg in args[:]: |
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| 98 | try: |
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| 99 | i = args.index(arg) |
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| 100 | if arg[:2] == '-o' and args[i+1][0]!='-': |
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| 101 | args[i:i+2] = [] # suck on it scp |
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| 102 | except ValueError: |
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| 103 | pass |
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| 104 | options = ClientOptions() |
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| 105 | try: |
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| 106 | options.parseOptions(args) |
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| 107 | except usage.UsageError, u: |
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| 108 | print 'ERROR: %s' % u |
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| 109 | options.opt_help() |
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| 110 | sys.exit(1) |
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| 111 | if options['log']: |
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| 112 | if options['logfile']: |
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| 113 | if options['logfile'] == '-': |
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| 114 | f = sys.stdout |
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| 115 | else: |
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| 116 | f = file(options['logfile'], 'a+') |
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| 117 | else: |
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| 118 | f = sys.stderr |
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| 119 | realout = sys.stdout |
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| 120 | log.startLogging(f) |
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| 121 | sys.stdout = realout |
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| 122 | else: |
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| 123 | log.discardLogs() |
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| 124 | doConnect() |
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| 125 | fd = sys.stdin.fileno() |
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| 126 | try: |
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| 127 | old = tty.tcgetattr(fd) |
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| 128 | except: |
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| 129 | old = None |
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| 130 | try: |
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| 131 | oldUSR1 = signal.signal(signal.SIGUSR1, lambda *a: reactor.callLater(0, reConnect)) |
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| 132 | except: |
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| 133 | oldUSR1 = None |
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| 134 | try: |
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| 135 | reactor.run() |
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| 136 | finally: |
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| 137 | if old: |
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| 138 | tty.tcsetattr(fd, tty.TCSANOW, old) |
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| 139 | if oldUSR1: |
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| 140 | signal.signal(signal.SIGUSR1, oldUSR1) |
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| 141 | if (options['command'] and options['tty']) or not options['notty']: |
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| 142 | signal.signal(signal.SIGWINCH, signal.SIG_DFL) |
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| 143 | if sys.stdout.isatty() and not options['command']: |
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| 144 | print 'Connection to %s closed.' % options['host'] |
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| 145 | sys.exit(exitStatus) |
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| 146 | |
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| 147 | def handleError(): |
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| 148 | from twisted.python import failure |
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| 149 | global exitStatus |
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| 150 | exitStatus = 2 |
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| 151 | reactor.callLater(0.01, _stopReactor) |
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| 152 | log.err(failure.Failure()) |
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| 153 | raise |
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| 154 | |
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| 155 | def _stopReactor(): |
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| 156 | try: |
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| 157 | reactor.stop() |
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| 158 | except: pass |
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| 159 | |
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| 160 | def doConnect(): |
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| 161 | # log.deferr = handleError # HACK |
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| 162 | if '@' in options['host']: |
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| 163 | options['user'], options['host'] = options['host'].split('@',1) |
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| 164 | if not options.identitys: |
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| 165 | options.identitys = ['~/.ssh/id_rsa', '~/.ssh/id_dsa'] |
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| 166 | host = options['host'] |
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| 167 | if not options['user']: |
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| 168 | options['user'] = getpass.getuser() |
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| 169 | if not options['port']: |
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| 170 | options['port'] = 22 |
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| 171 | else: |
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| 172 | options['port'] = int(options['port']) |
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| 173 | host = options['host'] |
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| 174 | port = options['port'] |
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| 175 | vhk = default.verifyHostKey |
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| 176 | uao = default.SSHUserAuthClient(options['user'], options, SSHConnection()) |
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| 177 | connect.connect(host, port, options, vhk, uao).addErrback(_ebExit) |
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| 178 | |
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| 179 | def _ebExit(f): |
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| 180 | global exitStatus |
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| 181 | if hasattr(f.value, 'value'): |
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| 182 | s = f.value.value |
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| 183 | else: |
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| 184 | s = str(f) |
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| 185 | exitStatus = "conch: exiting with error %s" % f |
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| 186 | reactor.callLater(0.1, _stopReactor) |
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| 187 | |
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| 188 | def onConnect(): |
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| 189 | # if keyAgent and options['agent']: |
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| 190 | # cc = protocol.ClientCreator(reactor, SSHAgentForwardingLocal, conn) |
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| 191 | # cc.connectUNIX(os.environ['SSH_AUTH_SOCK']) |
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| 192 | if hasattr(conn.transport, 'sendIgnore'): |
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| 193 | _KeepAlive(conn) |
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| 194 | if options.localForwards: |
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| 195 | for localPort, hostport in options.localForwards: |
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| 196 | s = reactor.listenTCP(localPort, |
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| 197 | forwarding.SSHListenForwardingFactory(conn, |
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| 198 | hostport, |
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| 199 | SSHListenClientForwardingChannel)) |
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| 200 | conn.localForwards.append(s) |
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| 201 | if options.remoteForwards: |
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| 202 | for remotePort, hostport in options.remoteForwards: |
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| 203 | log.msg('asking for remote forwarding for %s:%s' % |
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| 204 | (remotePort, hostport)) |
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| 205 | conn.requestRemoteForwarding(remotePort, hostport) |
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| 206 | reactor.addSystemEventTrigger('before', 'shutdown', beforeShutdown) |
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| 207 | if not options['noshell'] or options['agent']: |
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| 208 | conn.openChannel(SSHSession()) |
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| 209 | if options['fork']: |
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| 210 | if os.fork(): |
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| 211 | os._exit(0) |
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| 212 | os.setsid() |
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| 213 | for i in range(3): |
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| 214 | try: |
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| 215 | os.close(i) |
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| 216 | except OSError, e: |
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| 217 | import errno |
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| 218 | if e.errno != errno.EBADF: |
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| 219 | raise |
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| 220 | |
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| 221 | def reConnect(): |
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| 222 | beforeShutdown() |
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| 223 | conn.transport.transport.loseConnection() |
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| 224 | |
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| 225 | def beforeShutdown(): |
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| 226 | remoteForwards = options.remoteForwards |
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| 227 | for remotePort, hostport in remoteForwards: |
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| 228 | log.msg('cancelling %s:%s' % (remotePort, hostport)) |
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| 229 | conn.cancelRemoteForwarding(remotePort) |
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| 230 | |
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| 231 | def stopConnection(): |
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| 232 | if not options['reconnect']: |
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| 233 | reactor.callLater(0.1, _stopReactor) |
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| 234 | |
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| 235 | class _KeepAlive: |
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| 236 | |
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| 237 | def __init__(self, conn): |
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| 238 | self.conn = conn |
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| 239 | self.globalTimeout = None |
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| 240 | self.lc = task.LoopingCall(self.sendGlobal) |
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| 241 | self.lc.start(300) |
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| 242 | |
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| 243 | def sendGlobal(self): |
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| 244 | d = self.conn.sendGlobalRequest("conch-keep-alive@twistedmatrix.com", |
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| 245 | "", wantReply = 1) |
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| 246 | d.addBoth(self._cbGlobal) |
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| 247 | self.globalTimeout = reactor.callLater(30, self._ebGlobal) |
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| 248 | |
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| 249 | def _cbGlobal(self, res): |
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| 250 | if self.globalTimeout: |
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| 251 | self.globalTimeout.cancel() |
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| 252 | self.globalTimeout = None |
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| 253 | |
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| 254 | def _ebGlobal(self): |
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| 255 | if self.globalTimeout: |
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| 256 | self.globalTimeout = None |
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| 257 | self.conn.transport.loseConnection() |
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| 258 | |
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| 259 | class SSHConnection(connection.SSHConnection): |
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| 260 | def serviceStarted(self): |
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| 261 | global conn |
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| 262 | conn = self |
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| 263 | self.localForwards = [] |
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| 264 | self.remoteForwards = {} |
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| 265 | if not isinstance(self, connection.SSHConnection): |
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| 266 | # make these fall through |
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| 267 | del self.__class__.requestRemoteForwarding |
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| 268 | del self.__class__.cancelRemoteForwarding |
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| 269 | onConnect() |
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| 270 | |
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| 271 | def serviceStopped(self): |
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| 272 | lf = self.localForwards |
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| 273 | self.localForwards = [] |
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| 274 | for s in lf: |
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| 275 | s.loseConnection() |
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| 276 | stopConnection() |
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| 277 | |
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| 278 | def requestRemoteForwarding(self, remotePort, hostport): |
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| 279 | data = forwarding.packGlobal_tcpip_forward(('0.0.0.0', remotePort)) |
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| 280 | d = self.sendGlobalRequest('tcpip-forward', data, |
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| 281 | wantReply=1) |
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| 282 | log.msg('requesting remote forwarding %s:%s' %(remotePort, hostport)) |
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| 283 | d.addCallback(self._cbRemoteForwarding, remotePort, hostport) |
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| 284 | d.addErrback(self._ebRemoteForwarding, remotePort, hostport) |
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| 285 | |
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| 286 | def _cbRemoteForwarding(self, result, remotePort, hostport): |
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| 287 | log.msg('accepted remote forwarding %s:%s' % (remotePort, hostport)) |
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| 288 | self.remoteForwards[remotePort] = hostport |
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| 289 | log.msg(repr(self.remoteForwards)) |
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| 290 | |
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| 291 | def _ebRemoteForwarding(self, f, remotePort, hostport): |
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| 292 | log.msg('remote forwarding %s:%s failed' % (remotePort, hostport)) |
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| 293 | log.msg(f) |
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| 294 | |
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| 295 | def cancelRemoteForwarding(self, remotePort): |
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| 296 | data = forwarding.packGlobal_tcpip_forward(('0.0.0.0', remotePort)) |
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| 297 | self.sendGlobalRequest('cancel-tcpip-forward', data) |
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| 298 | log.msg('cancelling remote forwarding %s' % remotePort) |
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| 299 | try: |
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| 300 | del self.remoteForwards[remotePort] |
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| 301 | except: |
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| 302 | pass |
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| 303 | log.msg(repr(self.remoteForwards)) |
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| 304 | |
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| 305 | def channel_forwarded_tcpip(self, windowSize, maxPacket, data): |
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| 306 | log.msg('%s %s' % ('FTCP', repr(data))) |
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| 307 | remoteHP, origHP = forwarding.unpackOpen_forwarded_tcpip(data) |
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| 308 | log.msg(self.remoteForwards) |
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| 309 | log.msg(remoteHP) |
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| 310 | if self.remoteForwards.has_key(remoteHP[1]): |
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| 311 | connectHP = self.remoteForwards[remoteHP[1]] |
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| 312 | log.msg('connect forwarding %s' % (connectHP,)) |
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| 313 | return SSHConnectForwardingChannel(connectHP, |
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| 314 | remoteWindow = windowSize, |
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| 315 | remoteMaxPacket = maxPacket, |
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| 316 | conn = self) |
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| 317 | else: |
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| 318 | raise ConchError(connection.OPEN_CONNECT_FAILED, "don't know about that port") |
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| 319 | |
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| 320 | # def channel_auth_agent_openssh_com(self, windowSize, maxPacket, data): |
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| 321 | # if options['agent'] and keyAgent: |
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| 322 | # return agent.SSHAgentForwardingChannel(remoteWindow = windowSize, |
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| 323 | # remoteMaxPacket = maxPacket, |
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| 324 | # conn = self) |
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| 325 | # else: |
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| 326 | # return connection.OPEN_CONNECT_FAILED, "don't have an agent" |
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| 327 | |
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| 328 | def channelClosed(self, channel): |
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| 329 | log.msg('connection closing %s' % channel) |
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| 330 | log.msg(self.channels) |
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| 331 | if len(self.channels) == 1: # just us left |
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| 332 | log.msg('stopping connection') |
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| 333 | stopConnection() |
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| 334 | else: |
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| 335 | # because of the unix thing |
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| 336 | self.__class__.__bases__[0].channelClosed(self, channel) |
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| 337 | |
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| 338 | class SSHSession(channel.SSHChannel): |
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| 339 | |
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| 340 | name = 'session' |
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| 341 | |
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| 342 | def channelOpen(self, foo): |
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| 343 | log.msg('session %s open' % self.id) |
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| 344 | if options['agent']: |
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| 345 | d = self.conn.sendRequest(self, 'auth-agent-req@openssh.com', '', wantReply=1) |
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| 346 | d.addBoth(lambda x:log.msg(x)) |
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| 347 | if options['noshell']: return |
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| 348 | if (options['command'] and options['tty']) or not options['notty']: |
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| 349 | _enterRawMode() |
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| 350 | c = session.SSHSessionClient() |
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| 351 | if options['escape'] and not options['notty']: |
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| 352 | self.escapeMode = 1 |
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| 353 | c.dataReceived = self.handleInput |
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| 354 | else: |
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| 355 | c.dataReceived = self.write |
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| 356 | c.connectionLost = lambda x=None,s=self:s.sendEOF() |
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| 357 | self.stdio = stdio.StandardIO(c) |
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| 358 | fd = 0 |
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| 359 | if options['subsystem']: |
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| 360 | self.conn.sendRequest(self, 'subsystem', \ |
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| 361 | common.NS(options['command'])) |
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| 362 | elif options['command']: |
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| 363 | if options['tty']: |
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| 364 | term = os.environ['TERM'] |
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| 365 | winsz = fcntl.ioctl(fd, tty.TIOCGWINSZ, '12345678') |
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| 366 | winSize = struct.unpack('4H', winsz) |
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| 367 | ptyReqData = session.packRequest_pty_req(term, winSize, '') |
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| 368 | self.conn.sendRequest(self, 'pty-req', ptyReqData) |
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| 369 | signal.signal(signal.SIGWINCH, self._windowResized) |
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| 370 | self.conn.sendRequest(self, 'exec', \ |
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| 371 | common.NS(options['command'])) |
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| 372 | else: |
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| 373 | if not options['notty']: |
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| 374 | term = os.environ['TERM'] |
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| 375 | winsz = fcntl.ioctl(fd, tty.TIOCGWINSZ, '12345678') |
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| 376 | winSize = struct.unpack('4H', winsz) |
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| 377 | ptyReqData = session.packRequest_pty_req(term, winSize, '') |
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| 378 | self.conn.sendRequest(self, 'pty-req', ptyReqData) |
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| 379 | signal.signal(signal.SIGWINCH, self._windowResized) |
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| 380 | self.conn.sendRequest(self, 'shell', '') |
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| 381 | #if hasattr(conn.transport, 'transport'): |
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| 382 | # conn.transport.transport.setTcpNoDelay(1) |
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| 383 | |
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| 384 | def handleInput(self, char): |
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| 385 | #log.msg('handling %s' % repr(char)) |
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| 386 | if char in ('\n', '\r'): |
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| 387 | self.escapeMode = 1 |
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| 388 | self.write(char) |
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| 389 | elif self.escapeMode == 1 and char == options['escape']: |
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| 390 | self.escapeMode = 2 |
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| 391 | elif self.escapeMode == 2: |
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| 392 | self.escapeMode = 1 # so we can chain escapes together |
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| 393 | if char == '.': # disconnect |
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| 394 | log.msg('disconnecting from escape') |
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| 395 | stopConnection() |
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| 396 | return |
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| 397 | elif char == '\x1a': # ^Z, suspend |
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| 398 | def _(): |
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| 399 | _leaveRawMode() |
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| 400 | sys.stdout.flush() |
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| 401 | sys.stdin.flush() |
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| 402 | os.kill(os.getpid(), signal.SIGTSTP) |
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| 403 | _enterRawMode() |
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| 404 | reactor.callLater(0, _) |
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| 405 | return |
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| 406 | elif char == 'R': # rekey connection |
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| 407 | log.msg('rekeying connection') |
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| 408 | self.conn.transport.sendKexInit() |
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| 409 | return |
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| 410 | elif char == '#': # display connections |
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| 411 | self.stdio.write('\r\nThe following connections are open:\r\n') |
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| 412 | channels = self.conn.channels.keys() |
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| 413 | channels.sort() |
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| 414 | for channelId in channels: |
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| 415 | self.stdio.write(' #%i %s\r\n' % (channelId, str(self.conn.channels[channelId]))) |
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| 416 | return |
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| 417 | self.write('~' + char) |
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| 418 | else: |
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| 419 | self.escapeMode = 0 |
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| 420 | self.write(char) |
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| 421 | |
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| 422 | def dataReceived(self, data): |
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| 423 | self.stdio.write(data) |
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| 424 | |
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| 425 | def extReceived(self, t, data): |
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| 426 | if t==connection.EXTENDED_DATA_STDERR: |
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| 427 | log.msg('got %s stderr data' % len(data)) |
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| 428 | sys.stderr.write(data) |
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| 429 | |
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| 430 | def eofReceived(self): |
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| 431 | log.msg('got eof') |
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| 432 | self.stdio.loseWriteConnection() |
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| 433 | |
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| 434 | def closeReceived(self): |
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| 435 | log.msg('remote side closed %s' % self) |
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| 436 | self.conn.sendClose(self) |
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| 437 | |
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| 438 | def closed(self): |
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| 439 | global old |
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| 440 | log.msg('closed %s' % self) |
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| 441 | log.msg(repr(self.conn.channels)) |
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| 442 | |
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| 443 | def request_exit_status(self, data): |
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| 444 | global exitStatus |
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| 445 | exitStatus = int(struct.unpack('>L', data)[0]) |
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| 446 | log.msg('exit status: %s' % exitStatus) |
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| 447 | |
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| 448 | def sendEOF(self): |
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| 449 | self.conn.sendEOF(self) |
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| 450 | |
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| 451 | def stopWriting(self): |
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| 452 | self.stdio.pauseProducing() |
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| 453 | |
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| 454 | def startWriting(self): |
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| 455 | self.stdio.resumeProducing() |
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| 456 | |
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| 457 | def _windowResized(self, *args): |
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| 458 | winsz = fcntl.ioctl(0, tty.TIOCGWINSZ, '12345678') |
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| 459 | winSize = struct.unpack('4H', winsz) |
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| 460 | newSize = winSize[1], winSize[0], winSize[2], winSize[3] |
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| 461 | self.conn.sendRequest(self, 'window-change', struct.pack('!4L', *newSize)) |
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| 462 | |
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| 463 | |
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| 464 | class SSHListenClientForwardingChannel(forwarding.SSHListenClientForwardingChannel): pass |
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| 465 | class SSHConnectForwardingChannel(forwarding.SSHConnectForwardingChannel): pass |
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| 466 | |
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| 467 | def _leaveRawMode(): |
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| 468 | global _inRawMode |
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| 469 | if not _inRawMode: |
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| 470 | return |
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| 471 | fd = sys.stdin.fileno() |
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| 472 | tty.tcsetattr(fd, tty.TCSANOW, _savedMode) |
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| 473 | _inRawMode = 0 |
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| 474 | |
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| 475 | def _enterRawMode(): |
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| 476 | global _inRawMode, _savedMode |
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| 477 | if _inRawMode: |
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| 478 | return |
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| 479 | fd = sys.stdin.fileno() |
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| 480 | try: |
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| 481 | old = tty.tcgetattr(fd) |
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| 482 | new = old[:] |
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| 483 | except: |
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| 484 | log.msg('not a typewriter!') |
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| 485 | else: |
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| 486 | # iflage |
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| 487 | new[0] = new[0] | tty.IGNPAR |
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| 488 | new[0] = new[0] & ~(tty.ISTRIP | tty.INLCR | tty.IGNCR | tty.ICRNL | |
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| 489 | tty.IXON | tty.IXANY | tty.IXOFF) |
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| 490 | if hasattr(tty, 'IUCLC'): |
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| 491 | new[0] = new[0] & ~tty.IUCLC |
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| 492 | |
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| 493 | # lflag |
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| 494 | new[3] = new[3] & ~(tty.ISIG | tty.ICANON | tty.ECHO | tty.ECHO | |
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| 495 | tty.ECHOE | tty.ECHOK | tty.ECHONL) |
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| 496 | if hasattr(tty, 'IEXTEN'): |
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| 497 | new[3] = new[3] & ~tty.IEXTEN |
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| 498 | |
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| 499 | #oflag |
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| 500 | new[1] = new[1] & ~tty.OPOST |
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| 501 | |
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| 502 | new[6][tty.VMIN] = 1 |
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| 503 | new[6][tty.VTIME] = 0 |
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| 504 | |
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| 505 | _savedMode = old |
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| 506 | tty.tcsetattr(fd, tty.TCSANOW, new) |
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| 507 | #tty.setraw(fd) |
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| 508 | _inRawMode = 1 |
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| 509 | |
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| 510 | if __name__ == '__main__': |
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| 511 | run() |
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