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