from socket import *
+from select import select
+from os import popen4
+from time import sleep
LATCP_SOCKET = '/var/run/latlogin'
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:
+ message = message + rfh.read(1)
+ else:
+ break
+ print "Received message: ", repr(message)
+ return message
+
+def write_expecting_echo(rfh, wfh, message):
+ print "Writing message:", repr(message)
+ while len(message) > 0:
+ wfh.write(message[0])
+ wfh.flush()
+ echo = rfh.read(1)
+ if echo != message[0]:
+ print "Gah, expected echo when writing", message[0]
+ message = message[1:]
+ print " --> Sent and echoed."
+
class LATClient:
- def __init__(self, service = None, node = None, port = None, \
- localport = None, password = None, is_queued = False):
+ def __init__(self, service = None, node = None, port = None,
+ localport = None, password = None, is_queued = False,
+ server_name = '', connect_password='', priv_password=''):
+
+ self.server_name = server_name
+ self.connect_password = connect_password
+ self.priv_password = priv_password
+
self.sock = socket(AF_UNIX, SOCK_STREAM, 0);
self.sock.connect(LATCP_SOCKET)
self.send_msg(LATCP_CMD_VERSION, LAT_VERSION+'\000')
))
(cmd, msg) = self.read_reply()
if ord(cmd) == LATCP_CMD_ERRORMSG:
- raise Exception('LATClient: '+msg)
+ raise LATClientException(msg)
+
+ self.rfh = self.sock.makefile('r')
+ self.wfh = self.sock.makefile('w')
+
+ r = select([self.rfh], [], [], 2.0)[0]
+ if r:
+ l = self.rfh.readline()
+ if l.find('Service in use') >= 0:
+ print "Service in use, apparently: restarting DEC server"
+ self.reboot_server()
def __del__(self):
try:
def send_msg(self, cmd, msg):
self.sock.send('%c%c%c%s'%(cmd, len(msg)/256, len(msg)%256, msg))
+ def reboot_server(self):
+ self.sock.shutdown(2)
+ self.sock.close()
+ mopw, mopr = popen4('/usr/sbin/moprc '+self.server_name)
+ write_expecting_echo(mopr, mopw, '\n')
+ read_for_a_bit(mopr)
+ write_expecting_echo(mopr, mopw, self.connect_password+'\n')
+ read_for_a_bit(mopr)
+ write_expecting_echo(mopr, mopw, 'grim reaper\n')
+ read_for_a_bit(mopr)
+ write_expecting_echo(mopr, mopw, 'set priv\n')
+ read_for_a_bit(mopr)
+ write_expecting_echo(mopr, mopw, self.priv_password+'\n')
+ read_for_a_bit(mopr)
+ write_expecting_echo(mopr, mopw, 'init del 0\n')
+ read_for_a_bit(mopr)
+ mopr.close()
+ mopw.close()
+ print
+ print "Waiting 10 seconds for DEC server to come back to life..."
+ sleep(10)
+ print "Rightyo, back to vending!"
+ print
+ 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):
- return (self.sock.makefile('r'), self.sock.makefile('w'))
+ return (self.rfh, self.wfh)