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[project @ robey@lag.net-20080219075127-fx3aq6ijgm38oxy6] 

cleaned up "forward" example.
This commit is contained in:
Robey Pointer 2008-02-18 23:51:27 -08:00
parent 3319f556d6
commit e963435e92
1 changed files with 76 additions and 118 deletions
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194
demos/forward.py
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@ -1,4 +1,4 @@
#!/usr/bin/python
#!/usr/bin/env python
# Copyright (C) 2003-2007 Robey Pointer <robey@lag.net>
#
@ -37,10 +37,10 @@ from optparse import OptionParser
import paramiko
DEFAULT_PORT = 4000
SSH_PORT = 22
VERBOSE = True
READPASS = False
DEFAULT_PORT = 4000
g_verbose = True
class ForwardServer (SocketServer.ThreadingTCPServer):
@ -65,7 +65,8 @@ class Handler (SocketServer.BaseRequestHandler):
(self.chain_host, self.chain_port))
return
verbose('Connected! Tunnel open.')
verbose('Connected! Tunnel open %r -> %r -> %r' % (self.request.getpeername(),
chan.getpeername(), (self.chain_host, self.chain_port)))
while True:
r, w, x = select.select([self.request, chan], [], [])
if self.request in r:
@ -80,7 +81,7 @@ class Handler (SocketServer.BaseRequestHandler):
self.request.send(data)
chan.close()
self.request.close()
verbose('Tunnel closed.')
verbose('Tunnel closed from %r' % (self.request.getpeername(),))
def forward_tunnel(local_port, remote_host, remote_port, transport):
@ -93,131 +94,88 @@ def forward_tunnel(local_port, remote_host, remote_port, transport):
ssh_transport = transport
ForwardServer(('', local_port), SubHander).serve_forever()
def find_default_key_file():
filename = os.path.expanduser('~/.ssh/id_rsa')
if os.access(filename, os.R_OK):
return filename
filename = os.path.expanduser('~/ssh/id_rsa')
if os.access(filename, os.R_OK):
return filename
filename = os.path.expanduser('~/.ssh/id_dsa')
if os.access(filename, os.R_OK):
return filename
filename = os.path.expanduser('~/ssh/id_dsa')
if os.access(filename, os.R_OK):
return filename
return ''
def verbose(s):
if VERBOSE:
if g_verbose:
print s
#####
HELP = """\
Set up a forward tunnel across an SSH server, using paramiko. A local port
(given with -l) is forwarded across an SSH session to an address:port from
the SSH server. This is similar to the openssh -L option.
"""
parser = OptionParser(usage='usage: %prog [options] <remote-addr>:<remote-port>',
version='%prog 1.0')
parser.add_option('-q', '--quiet', action='store_false', dest='verbose', default=VERBOSE,
help='squelch all informational output')
parser.add_option('-l', '--local-port', action='store', type='int', dest='port',
default=DEFAULT_PORT,
help='local port to forward (default: %d)' % DEFAULT_PORT)
parser.add_option('-r', '--host', action='store', type='string', dest='ssh_host',
help='SSH host to tunnel through (required)')
parser.add_option('-p', '--port', action='store', type='int', dest='ssh_port', default=SSH_PORT,
help='SSH port to tunnel through (default: %d)' % SSH_PORT)
parser.add_option('-u', '--user', action='store', type='string', dest='user',
default=getpass.getuser(),
help='username for SSH authentication (default: %s)' % getpass.getuser())
parser.add_option('-K', '--key', action='store', type='string', dest='keyfile',
default=find_default_key_file(),
help='private key file to use for SSH authentication')
parser.add_option('', '--no-key', action='store_false', dest='use_key', default=True,
help='don\'t look for or use a private key file')
parser.add_option('-P', '--password', action='store_true', dest='readpass', default=READPASS,
help='read password (for key or password auth) from stdin')
options, args = parser.parse_args()
VERBOSE = options.verbose
READPASS = options.readpass
def get_host_port(spec, default_port):
"parse 'hostname:22' into a host and port, with the port optional"
args = (spec.split(':', 1) + [default_port])[:2]
args[1] = int(args[1])
return args[0], args[1]
if len(args) != 1:
parser.error('Incorrect number of arguments.')
remote_host = args[0]
if ':' not in remote_host:
parser.error('Remote port missing.')
remote_host, remote_port = remote_host.split(':', 1)
try:
remote_port = int(remote_port)
except:
parser.error('Remote port must be a number.')
def parse_options():
global g_verbose
parser = OptionParser(usage='usage: %prog [options] <ssh-server>[:<server-port>]',
version='%prog 1.0', description=HELP)
parser.add_option('-q', '--quiet', action='store_false', dest='verbose', default=True,
help='squelch all informational output')
parser.add_option('-l', '--local-port', action='store', type='int', dest='port',
default=DEFAULT_PORT,
help='local port to forward (default: %d)' % DEFAULT_PORT)
parser.add_option('-u', '--user', action='store', type='string', dest='user',
default=getpass.getuser(),
help='username for SSH authentication (default: %s)' % getpass.getuser())
parser.add_option('-K', '--key', action='store', type='string', dest='keyfile',
default=None,
help='private key file to use for SSH authentication')
parser.add_option('', '--no-key', action='store_false', dest='look_for_keys', default=True,
help='don\'t look for or use a private key file')
parser.add_option('-P', '--password', action='store_true', dest='readpass', default=False,
help='read password (for key or password auth) from stdin')
parser.add_option('-r', '--remote', action='store', type='string', dest='remote', default=None, metavar='host:port',
help='remote host and port to forward to')
options, args = parser.parse_args()
if not options.ssh_host:
parser.error('SSH host is required.')
if ':' in options.ssh_host:
options.ssh_host, options.ssh_port = options.ssh_host.split(':', 1)
if len(args) != 1:
parser.error('Incorrect number of arguments.')
if options.remote is None:
parser.error('Remote address required (-r).')
g_verbose = options.verbose
server_host, server_port = get_host_port(args[0], SSH_PORT)
remote_host, remote_port = get_host_port(options.remote, SSH_PORT)
return options, (server_host, server_port), (remote_host, remote_port)
def main():
options, server, remote = parse_options()
password = None
if options.readpass:
password = getpass.getpass('Enter SSH password: ')
client = paramiko.SSHClient()
client.load_system_host_keys()
client.set_missing_host_key_policy(paramiko.WarningPolicy())
verbose('Connecting to ssh host %s:%d ...' % (server[0], server[1]))
try:
options.ssh_port = int(options.ssh_port)
except:
parser.error('SSH port must be a number.')
try:
host_keys = paramiko.util.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
except IOError:
try:
host_keys = paramiko.util.load_host_keys(os.path.expanduser('~/ssh/known_hosts'))
except IOError:
print '*** Unable to open host keys file'
host_keys = {}
if not host_keys.has_key(options.ssh_host):
print '*** Warning: no host key for %s' % options.ssh_host
expected_host_key_type = None
expected_host_key = None
else:
expected_host_key_type = host_keys[options.ssh_host].keys()[0]
expected_host_key = host_keys[options.ssh_host][expected_host_key_type]
key = None
password = None
if options.use_key:
try:
key = paramiko.RSAKey.from_private_key_file(options.keyfile)
except paramiko.PasswordRequiredException:
if not READPASS:
print '*** Password needed for keyfile (use -P): %s' % options.keyfile
sys.exit(1)
key_password = getpass.getpass('Enter password for key: ')
try:
key = paramiko.RSAKey.from_private_key_file(options.keyfile, key_password)
except:
print '*** Unable to read keyfile: %s' % options.keyfile
sys.exit(1)
except:
pass
if key is None:
# try reading a password then
if not READPASS:
print '*** Either a valid private key or password is required (use -K or -P).'
client.connect(server[0], server[1], username=options.user, key_filename=options.keyfile,
look_for_keys=options.look_for_keys, password=password)
except Exception, e:
print '*** Failed to connect to %s:%d: %r' % (server[0], server[1], e)
sys.exit(1)
password = getpass.getpass('Enter password: ')
verbose('Connecting to ssh host %s:%d ...' % (options.ssh_host, options.ssh_port))
verbose('Now forwarding port %d to %s:%d ...' % (options.port, remote[0], remote[1]))
transport = paramiko.Transport((options.ssh_host, options.ssh_port))
transport.connect(hostkeytype=expected_host_key_type,
hostkey=expected_host_key,
username=options.user,
password=password,
pkey=key)
try:
forward_tunnel(options.port, remote[0], remote[1], client.get_transport())
except KeyboardInterrupt:
print 'C-c: Port forwarding stopped.'
sys.exit(0)
verbose('Now forwarding port %d to %s:%d ...' % (options.port, remote_host, remote_port))
try:
forward_tunnel(options.port, remote_host, remote_port, transport)
except KeyboardInterrupt:
print 'Port forwarding stopped.'
sys.exit(0)
if __name__ == '__main__':
main()