sql-edition/servers/LATClient.py

   1 from socket import *
   2 from select import select
   3 from os import popen
   4 from time import sleep
   5
   6 LATCP_SOCKET = '/var/run/latlogin'
   7
   8 LAT_VERSION = '1.21'
   9 LATCP_CMD_VERSION = 8
  10 LATCP_CMD_TERMINALSESSION = 26
  11 LATCP_CMD_ERRORMSG = 99
  12
  13 class LATClient:
  14         def __init__(self, service = None, node = None, port = None,
  15                      localport = None, password = None, is_queued = False,
  16                      server_name = '', connect_password='', priv_password=''):
  17
  18                 self.server_name = server_name
  19                 self.connect_password = connect_password
  20                 self.priv_password = priv_password
  21
  22                 self.sock = socket(AF_UNIX, SOCK_STREAM, 0);
  23                 self.sock.connect(LATCP_SOCKET)
  24                 self.send_msg(LATCP_CMD_VERSION, LAT_VERSION+'\000')
  25                 (cmd, msg) = self.read_reply()
  26                 if service == None: service = ''
  27                 if node == None: node = ''
  28                 if port == None: port = ''
  29                 if localport == None: localport = ''
  30                 if password == None: password = ''
  31                 if is_queued == True:
  32                         is_queued = 1
  33                 else:
  34                         is_queued = 0
  35                 self.send_msg(LATCP_CMD_TERMINALSESSION, '%c%c%s%c%s%c%s%c%s%c%s' % \
  36                         (is_queued,
  37                          len(service), service,
  38                          len(node), node,
  39                          len(port), port,
  40                          len(localport), localport,
  41                          len(password), password
  42                          ))
  43                 (cmd, msg) = self.read_reply()
  44                 if ord(cmd) == LATCP_CMD_ERRORMSG:
  45                         raise Exception('LATClient: '+msg)
  46
  47                 r = select([self.sock], [], [], 2.0)[0]
  48                 if r:
  49                         l = self.sock.readline()
  50                         if l.find('Service in use') >= 0:
  51                                 print "Service in use, apparently: restarting DEC server"
  52                                 self.reboot_server()
  53
  54         def __del__(self):
  55                 try:
  56                         self.sock.close()
  57                         self.sock.shutdown(2)
  58                 except:
  59                         pass
  60                 del self.sock
  61
  62         def send_msg(self, cmd, msg):
  63                 self.sock.send('%c%c%c%s'%(cmd, len(msg)/256, len(msg)%256, msg))
  64
  65         def reboot_server(self):
  66                 self.sock.shutdown(2)
  67                 self.sock.close()
  68                 mop = popen('/usr/sbin/moprc '+self.server_name, 'w')
  69                 mop.write('\n')
  70                 mop.write(self.connect_password+'\n')
  71                 mop.write('grim reaper\n')
  72                 mop.write('set priv\n')
  73                 mop.write(self.priv_password+'\n')
  74                 mop.write('init del 0\n')
  75                 mop.close()
  76                 print "Waiting 10 seconds for DEC server to come back to life..."
  77                 sleep(10)
  78
  79         def read_reply(self):
  80                 head = self.sock.recv(3)
  81                 if len(head) != 3:
  82                         sys.stderr.write('Error: Short LAT packet\n')
  83                         return None
  84                 cmd = head[0]
  85                 length = ord(head[1])*256 + ord(head[2])
  86                 msg = self.sock.recv(length)
  87                 if cmd == LATCP_CMD_ERRORMSG:
  88                         sys.stderr.write('Error: Received LAT error: %s\n'%msg)
  89                 return (cmd, msg)
  90
  91         def get_fh(self):
  92                 return (self.sock.makefile('r'), self.sock.makefile('w'))