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#!/usr/bin/python
import sys, os, base64, getpass, socket, traceback, termios, tty, select
import paramiko
##### utility functions
def load_host_keys():
filename = os.environ['HOME'] + '/.ssh/known_hosts'
keys = {}
try:
f = open(filename, 'r')
except Exception, e:
print '*** Unable to open host keys file (%s)' % filename
return
for line in f:
keylist = line.split(' ')
if len(keylist) != 3:
continue
hostlist, keytype, key = keylist
hosts = hostlist.split(',')
for host in hosts:
if not keys.has_key(host):
keys[host] = {}
keys[host][keytype] = base64.decodestring(key)
f.close()
return keys
# setup logging
paramiko.util.log_to_file('demo.log')
# get hostname
username = ''
if len(sys.argv) > 1:
hostname = sys.argv[1]
if hostname.find('@') >= 0:
username, hostname = hostname.split('@')
else:
hostname = raw_input('Hostname: ')
if len(hostname) == 0:
print '*** Hostname required.'
sys.exit(1)
port = 22
if hostname.find(':') >= 0:
hostname, portstr = hostname.split(':')
port = int(portstr)
# get username
if username == '':
default_username = getpass.getuser()
username = raw_input('Username [%s]: ' % default_username)
if len(username) == 0:
username = default_username
password = getpass.getpass('Password for %s@%s: ' % (username, hostname))
# get host key, if we know one
hostkeytype = None
hostkey = None
hkeys = load_host_keys()
if hkeys.has_key(hostname):
hostkeytype = hkeys[hostname].keys()[0]
hostkey = hkeys[hostname][hostkeytype]
print 'Using host key of type %s' % hostkeytype
# now, connect and use paramiko Transport to negotiate SSH2 across the connection
try:
t = paramiko.Transport((hostname, port))
t.connect(username=username, password=password, hostkeytype=hostkeytype, hostkey=hostkey)
chan = t.open_session()
chan.get_pty()
chan.invoke_shell()
print '*** Here we go!'
print
try:
oldtty = termios.tcgetattr(sys.stdin)
tty.setraw(sys.stdin.fileno())
tty.setcbreak(sys.stdin.fileno())
chan.settimeout(0.0)
while 1:
r, w, e = select.select([chan, sys.stdin], [], [])
if chan in r:
try:
x = chan.recv(1024)
if len(x) == 0:
print '\r\n*** EOF\r\n',
break
sys.stdout.write(x)
sys.stdout.flush()
except socket.timeout:
pass
if sys.stdin in r:
# FIXME: reading 1 byte at a time is incredibly dumb.
x = sys.stdin.read(1)
if len(x) == 0:
print
print '*** Bye.\r\n',
break
chan.send(x)
finally:
termios.tcsetattr(sys.stdin, termios.TCSADRAIN, oldtty)
chan.close()
t.close()
except Exception, e:
print '*** Caught exception: ' + str(e.__class__) + ': ' + str(e)
traceback.print_exc()
try:
t.close()
except:
pass
sys.exit(1)
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