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# Copyright (C) 2006-2010 Robey Pointer <robey@lag.net>
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# Copyright (C) 2005 Robey Pointer <robey@lag.net>
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# Copyright (C) 2005, 2006, 2007 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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stdout = stderr = ''
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return stdout + stderr
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def _get_vendor_by_version_string(self, version, progname):
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def _get_vendor_by_version_string(self, version, args):
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"""Return the vendor or None based on output from the subprocess.
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:param version: The output of 'ssh -V' like command.
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elif 'SSH Secure Shell' in version:
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trace.mutter('ssh implementation is SSH Corp.')
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vendor = SSHCorpSubprocessVendor()
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# As plink user prompts are not handled currently, don't auto-detect
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# it by inspection below, but keep this vendor detection for if a path
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# is given in BZR_SSH. See https://bugs.launchpad.net/bugs/414743
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elif 'plink' in version and progname == 'plink':
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# Checking if "plink" was the executed argument as Windows
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# sometimes reports 'ssh -V' incorrectly with 'plink' in it's
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# version. See https://bugs.launchpad.net/bzr/+bug/107155
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trace.mutter("ssh implementation is Putty's plink.")
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vendor = PLinkSubprocessVendor()
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# Auto-detect of plink vendor disabled, on Windows recommended
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# default ssh-client is paramiko
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# see https://bugs.launchpad.net/bugs/414743
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#~elif 'plink' in version and args[0] == 'plink':
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#~ # Checking if "plink" was the executed argument as Windows
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#~ # sometimes reports 'ssh -V' incorrectly with 'plink' in it's
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#~ # version. See https://bugs.launchpad.net/bzr/+bug/107155
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#~ trace.mutter("ssh implementation is Putty's plink.")
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#~ vendor = PLinkSubprocessVendor()
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def _get_vendor_by_inspection(self):
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"""Return the vendor or None by checking for known SSH implementations."""
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version = self._get_ssh_version_string(['ssh', '-V'])
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return self._get_vendor_by_version_string(version, "ssh")
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def _get_vendor_from_path(self, path):
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"""Return the vendor or None using the program at the given path"""
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version = self._get_ssh_version_string([path, '-V'])
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return self._get_vendor_by_version_string(version,
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os.path.splitext(os.path.basename(path))[0])
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for args in (['ssh', '-V'], ['plink', '-V']):
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version = self._get_ssh_version_string(args)
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vendor = self._get_vendor_by_version_string(version, args)
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if vendor is not None:
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def get_vendor(self, environment=None):
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"""Find out what version of SSH is on the system.
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register_ssh_vendor = _ssh_vendor_manager.register_vendor
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def _ignore_signals():
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def _ignore_sigint():
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# TODO: This should possibly ignore SIGHUP as well, but bzr currently
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# doesn't handle it itself.
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# <https://launchpad.net/products/bzr/+bug/41433/+index>
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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# GZ 2010-02-19: Perhaps make this check if breakin is installed instead
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if signal.getsignal(signal.SIGQUIT) != signal.SIG_DFL:
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signal.signal(signal.SIGQUIT, signal.SIG_IGN)
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class SocketAsChannelAdapter(object):
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class OpenSSHSubprocessVendor(SubprocessVendor):
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"""SSH vendor that uses the 'ssh' executable from OpenSSH."""
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executable_path = 'ssh'
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def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
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args = [self.executable_path,
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'-oForwardX11=no', '-oForwardAgent=no',
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'-oClearAllForwardings=yes', '-oProtocol=2',
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'-oNoHostAuthenticationForLocalhost=yes']
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class SSHCorpSubprocessVendor(SubprocessVendor):
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"""SSH vendor that uses the 'ssh' executable from SSH Corporation."""
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executable_path = 'ssh'
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def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
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args = [self.executable_path, '-x']
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if port is not None:
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args.extend(['-p', str(port)])
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if username is not None:
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args.extend([host] + command)
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register_ssh_vendor('sshcorp', SSHCorpSubprocessVendor())
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register_ssh_vendor('ssh', SSHCorpSubprocessVendor())
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class PLinkSubprocessVendor(SubprocessVendor):
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"""SSH vendor that uses the 'plink' executable from Putty."""
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executable_path = 'plink'
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def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
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args = [self.executable_path, '-x', '-a', '-ssh', '-2', '-batch']
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args = ['plink', '-x', '-a', '-ssh', '-2', '-batch']
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if port is not None:
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args.extend(['-P', str(port)])
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if username is not None:
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# Running it in a separate process group is not good because then it
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# can't get non-echoed input of a password or passphrase.
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# <https://launchpad.net/products/bzr/+bug/40508>
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return {'preexec_fn': _ignore_signals,
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return {'preexec_fn': _ignore_sigint,
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'close_fds': True,
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_subproc_weakrefs = set()
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def _close_ssh_proc(proc):
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for func in [proc.stdin.close, proc.stdout.close, proc.wait]:
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class SSHSubprocess(object):
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"""A socket-like object that talks to an ssh subprocess via pipes."""
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def __init__(self, proc):
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# Add a weakref to proc that will attempt to do the same as self.close
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# to avoid leaving processes lingering indefinitely.
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_subproc_weakrefs.remove(ref)
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_close_ssh_proc(proc)
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_subproc_weakrefs.add(weakref.ref(self, terminate))
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def send(self, data):
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return os.write(self.proc.stdin.fileno(), data)