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from twisted.internet import reactor
from twisted.internet import protocol
from twisted.protocols import telnet
from xen.ext import xu
from xen.xend import EventServer
eserver = EventServer.instance()
import controller
from messages import *
from params import *
"""Telnet binary option."""
TRANSMIT_BINARY = '0'
WILL = chr(251)
IAC = chr(255)
class ConsoleProtocol(protocol.Protocol):
"""Asynchronous handler for a console TCP socket.
"""
def __init__(self, controller, idx):
self.controller = controller
self.idx = idx
self.addr = None
self.binary = 0
def connectionMade(self):
peer = self.transport.getPeer()
self.addr = (peer.host, peer.port)
if self.controller.connect(self.addr, self):
self.transport.write("Cannot connect to console %d on domain %d\n"
% (self.idx, self.controller.dom))
self.loseConnection()
return
else:
# KAF: A nice quiet successful connect. Don't bother with telnet
# control sequence -- telnet is not the appropriate protocol here.
#self.transport.write("Connected to console %d on domain %d\n"
# % (self.idx, self.controller.dom))
#self.setTelnetTransmitBinary()
eserver.inject('xend.console.connect',
[self.idx, self.addr[0], self.addr[1]])
def setTelnetTransmitBinary(self):
"""Send the sequence to set the telnet TRANSMIT-BINARY option.
"""
self.write(IAC + WILL + TRANSMIT_BINARY)
def dataReceived(self, data):
if self.controller.handleInput(self, data):
self.loseConnection()
def write(self, data):
#if not self.connected: return -1
self.transport.write(data)
return len(data)
def connectionLost(self, reason=None):
eserver.inject('xend.console.disconnect',
[self.idx, self.addr[0], self.addr[1]])
self.controller.disconnect()
def loseConnection(self):
self.transport.loseConnection()
class ConsoleFactory(protocol.ServerFactory):
"""Asynchronous handler for a console server socket.
"""
protocol = ConsoleProtocol
def __init__(self, controller, idx):
#protocol.ServerFactory.__init__(self)
self.controller = controller
self.idx = idx
def buildProtocol(self, addr):
proto = self.protocol(self.controller, self.idx)
proto.factory = self
return proto
class ConsoleControllerFactory(controller.ControllerFactory):
"""Factory for creating console controllers.
"""
def createInstance(self, dom, console_port=None):
if console_port is None:
console_port = CONSOLE_PORT_BASE + dom
console = ConsoleController(self, dom, console_port)
self.addInstance(console)
eserver.inject('xend.console.create',
[console.idx, console.dom, console.console_port])
return console
def consoleClosed(self, console):
eserver.inject('xend.console.close', console.idx)
self.delInstance(console)
class ConsoleController(controller.Controller):
"""Console controller for a domain.
Does not poll for i/o itself, but relies on the notifier to post console
output and the connected TCP sockets to post console input.
"""
def __init__(self, factory, dom, console_port):
#print 'ConsoleController> dom=', dom, type(dom)
controller.Controller.__init__(self, factory, dom)
self.majorTypes = [ CMSG_CONSOLE ]
self.status = "new"
self.addr = None
self.conn = None
self.rbuf = xu.buffer()
self.wbuf = xu.buffer()
self.console_port = console_port
self.registerChannel()
self.listener = None
self.listen()
#print 'ConsoleController<', 'dom=', self.dom, 'idx=', self.idx
def sxpr(self):
val =['console',
['status', self.status ],
['id', self.idx ],
['domain', self.dom ],
['local_port', self.channel.getLocalPort() ],
['remote_port', self.channel.getRemotePort() ],
['console_port', self.console_port ] ]
if self.addr:
val.append(['connected', self.addr[0], self.addr[1]])
return val
def ready(self):
return not (self.closed() or self.rbuf.empty())
def closed(self):
return self.status == 'closed'
def connected(self):
return self.status == 'connected'
def close(self):
try:
#print 'ConsoleController> close dom=', self.dom
self.status = "closed"
if self.conn:
self.conn.loseConnection()
self.listener.stopListening()
self.deregisterChannel()
self.lostChannel()
except Exception, ex:
print 'ConsoleController>close>', ex
raise
def listen(self):
"""Listen for TCP connections to the console port..
"""
if self.closed(): return
self.status = "listening"
if self.listener:
#self.listener.startListening()
pass
else:
f = ConsoleFactory(self, self.idx)
self.listener = reactor.listenTCP(self.console_port, f)
def connect(self, addr, conn):
if self.closed(): return -1
if self.connected(): return -1
self.addr = addr
self.conn = conn
self.status = "connected"
self.handleOutput()
return 0
def disconnect(self):
if self.conn:
self.conn.loseConnection()
self.addr = None
self.conn = None
self.listen()
def requestReceived(self, msg, type, subtype):
#print '***Console', self.dom, msg.get_payload()
self.rbuf.write(msg.get_payload())
self.handleOutput()
def responseReceived(self, msg, type, subtype):
pass
def produceRequests(self):
# Send as much pending console data as there is room for.
work = 0
while not self.wbuf.empty() and self.channel.writeReady():
msg = xu.message(CMSG_CONSOLE, 0, 0)
msg.append_payload(self.wbuf.read(msg.MAX_PAYLOAD))
work += self.channel.writeRequest(msg, notify=0)
return work
def handleInput(self, conn, data):
"""Handle some external input aimed at the console.
Called from a TCP connection (conn).
"""
if self.closed(): return -1
if conn != self.conn: return 0
self.wbuf.write(data)
if self.produceRequests():
self.channel.notify()
return 0
def handleOutput(self):
"""Handle buffered output from the console.
Sends it to the connected console (if any).
"""
if self.closed():
#print 'Console>handleOutput> closed'
return -1
if not self.conn:
#print 'Console>handleOutput> not connected'
return 0
while not self.rbuf.empty():
try:
#print 'Console>handleOutput> writing...'
bytes = self.conn.write(self.rbuf.peek())
if bytes > 0:
self.rbuf.discard(bytes)
except socket.error, error:
pass
#print 'Console>handleOutput<'
return 0
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