# Read username, output from factory interfacing to OS, drop connections from twisted.internet import protocol, reactor, defer, utils from twisted.protocols import basic class FingerProtocol(basic.LineReceiver): def lineReceived(self, user): d = self.factory.getUser(user) def onError(err): return 'Internal error in server' d.addErrback(onError) def writeResponse(message): self.transport.write(message + '\r\n') self.transport.loseConnection() d.addCallback(writeResponse) class FingerFactory(protocol.ServerFactory): protocol = FingerProtocol def getUser(self, user): return utils.getProcessOutput("finger", [user]) reactor.listenTCP(1079, FingerFactory()) reactor.run()