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Ewan Mellor
027a790317
code from the relocation protocol handling and some plumbing. Add a new configuration entry for the Xen-API server, including use of this mechanism. Signed-off-by: Ewan Mellor <ewan@xensource.com>
128 lines
3.7 KiB
Python
128 lines
3.7 KiB
Python
#============================================================================
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# This library is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#============================================================================
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# Copyright (C) 2005 Mike Wray <mike.wray@hp.com>
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# Copyright (C) 2005 XenSource Ltd.
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#============================================================================
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import sys
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import threading
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import socket
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import fcntl
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from errno import EAGAIN, EINTR, EWOULDBLOCK
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from xen.xend.XendLogging import log
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"""General classes to support server and client sockets, without
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specifying what kind of socket they are. There are subclasses
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for TCP and unix-domain sockets (see tcp.py and unix.py).
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"""
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BUFFER_SIZE = 1024
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BACKLOG = 5
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class SocketServerConnection:
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"""An accepted connection to a server.
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"""
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def __init__(self, sock, protocol_class):
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self.sock = sock
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self.protocol = protocol_class()
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self.protocol.setTransport(self)
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threading.Thread(target=self.main).start()
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def main(self):
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try:
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while True:
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try:
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data = self.sock.recv(BUFFER_SIZE)
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if data == '':
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break
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if self.protocol.dataReceived(data):
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break
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except socket.error, ex:
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if ex.args[0] not in (EWOULDBLOCK, EAGAIN, EINTR):
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break
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finally:
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try:
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self.sock.close()
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except:
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pass
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def close(self):
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self.sock.close()
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def write(self, data):
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self.sock.send(data)
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class SocketListener:
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"""A server socket, running listen in a thread.
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Accepts connections and runs a thread for each one.
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"""
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def __init__(self, protocol_class):
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self.protocol_class = protocol_class
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self.sock = self.createSocket()
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threading.Thread(target=self.main).start()
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def close(self):
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try:
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self.sock.close()
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except:
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pass
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def createSocket(self):
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raise NotImplementedError()
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def acceptConnection(self, sock, protocol, addr):
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raise NotImplementedError()
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def main(self):
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try:
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fcntl.fcntl(self.sock.fileno(), fcntl.F_SETFD, fcntl.FD_CLOEXEC)
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self.sock.listen(BACKLOG)
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while True:
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try:
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(sock, addr) = self.sock.accept()
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self.acceptConnection(sock, addr)
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except socket.error, ex:
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if ex.args[0] not in (EWOULDBLOCK, EAGAIN, EINTR):
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break
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finally:
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self.close()
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def hostAllowed(addrport, hosts_allowed):
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if hosts_allowed is None:
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return True
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else:
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fqdn = socket.getfqdn(addrport[0])
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for h in hosts_allowed:
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if h.match(fqdn) or h.match(addrport[0]):
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return True
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log.warn("Rejected connection from %s (%s).", addrport[0], fqdn)
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return False
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