from socket import *
from select import select
-from os import popen
+from os import popen4
from time import sleep
+import logging
LATCP_SOCKET = '/var/run/latlogin'
-LAT_VERSION = '1.21'
+LAT_VERSION = '1.22'
LATCP_CMD_VERSION = 8
LATCP_CMD_TERMINALSESSION = 26
LATCP_CMD_ERRORMSG = 99
class LATClientException(Exception): pass
+def read_for_a_bit(rfh):
+ message = ''
+ while 1:
+ r = select([rfh], [], [], 5.0)[0]
+ if r:
+ try:
+ ch = rfh.read(1)
+ except socket.error:
+ ch = ''
+ if ch == '':
+ break
+ message = message + ch
+ else:
+ break
+ logging.debug("Received message: ", repr(message))
+ return message
+
+def write_and_get_response(rfh, wfh, message, expect_echo=True):
+ logging.debug("Writing message:", repr(message))
+ wfh.write(message+'\r\n')
+ wfh.flush()
+ logging.debug(" --> Sent")
+ response = read_for_a_bit(rfh)
+ if response.find(message) == -1 and expect_echo:
+ raise LATClientException("Talking to DEC server, expected to find original message in echo but didn't")
+ return response
+
class LATClient:
def __init__(self, service = None, node = None, port = None,
localport = None, password = None, is_queued = False,
if r:
l = self.rfh.readline()
if l.find('Service in use') >= 0:
- print "Service in use, apparently: restarting DEC server"
+ logging.warning("Service in use, apparently: restarting DEC server")
self.reboot_server()
def __del__(self):
def reboot_server(self):
self.sock.shutdown(2)
self.sock.close()
- mop = popen('/usr/sbin/moprc '+self.server_name, 'w')
- mop.write('\n')
- mop.write(self.connect_password+'\n')
- mop.write('grim reaper\n')
- mop.write('set priv\n')
- mop.write(self.priv_password+'\n')
- mop.write('init del 0\n')
- mop.close()
- print
- print "Waiting 10 seconds for DEC server to come back to life..."
+
+ logging.info('Logging into DEC server')
+ mopw, mopr = popen4('/usr/sbin/moprc '+self.server_name)
+ write_and_get_response(mopr, mopw, '')
+
+ logging.info('Sending password')
+ r = write_and_get_response(mopr, mopw, self.connect_password, False)
+ if r.find('Enter username> ') == -1:
+ logging.warning("Expected username prompt, got " + repr(r))
+ raise LATClientException('failed to reboot server')
+
+ logging.info('Sending username')
+ r = write_and_get_response(mopr, mopw, 'grim reaper')
+ if r.find('Local> ') == -1:
+ logging.warning("Expected DEC server prompt, got " + repr(r))
+ raise LATClientException('failed to reboot server')
+
+ logging.info('Requesting privileges')
+ r = write_and_get_response(mopr, mopw, 'set priv')
+ if r.find('Password> ') == -1:
+ logging.warning("Expected priv password prompt, got " + repr(r))
+ raise LATClientException('failed to reboot server')
+
+ logging.info('Sending password')
+ r = write_and_get_response(mopr, mopw, self.priv_password, False)
+ if r.find('Local> ') == -1:
+ logging.warning("Expected DEC server prompt, got " + repr(r))
+ raise LATClientException('failed to reboot server')
+
+ logging.info('Sending reboot request')
+ r = write_and_get_response(mopr, mopw, 'init del 0')
+ if r.find('Target does not respond') == -1:
+ logging.warning("Expected DEC server to die, got " + repr(r))
+ raise LATClientException('failed to reboot server')
+
+ logging.info('Closed connection to server')
+ mopr.close()
+ mopw.close()
+ logging.info("Waiting 10 seconds for DEC server to come back to life...")
sleep(10)
- print "Rightyo, back to vending!"
- print
+ logging.info("Rightyo, back to vending!")
+ raise LATClientException('needed to reboot server')
def read_reply(self):
head = self.sock.recv(3)
if len(head) != 3:
- sys.stderr.write('Error: Short LAT packet\n')
- return None
+ raise LATClientException('Short LAT packet')
cmd = head[0]
length = ord(head[1])*256 + ord(head[2])
msg = self.sock.recv(length)
if cmd == LATCP_CMD_ERRORMSG:
- sys.stderr.write('Error: Received LAT error: %s\n'%msg)
+ raise LATClientException('Received LAT error: %s'%msg)
return (cmd, msg)
def get_fh(self):