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#!/usr/bin/python
# This demo is like demo_simple.py, but it doesn't try to use select()
# to poll the ssh channel for reading, so it can be used on Windows.
# It logs into a shell, executes "ls", prints out the results, and
# exits.
import sys, os, base64, getpass, socket, traceback
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] = {}
if keytype == 'ssh-rsa':
keys[host][keytype] = paramiko.RSAKey(data=base64.decodestring(key))
elif keytype == 'ssh-dss':
keys[host][keytype] = paramiko.DSSKey(data=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, hostkey=hostkey)
chan = t.open_session()
chan.get_pty()
print '*** Here we go!'
print
print '>>> ls'
chan.exec_command('ps auxww')
f = chan.makefile('r+')
for line in f:
print line.strip('\n')
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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