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""" Twisted inetd TAP support The purpose of inetdtap is to provide an inetd-like server, to allow Twisted to invoke other programs to handle incoming sockets. This is a useful thing as a "networking swiss army knife" tool, like netcat. """ import pwd, grp, socket from twisted.runner import inetd, inetdconf from twisted.python import log, usage from twisted.internet.protocol import ServerFactory from twisted.application import internet, service as appservice # Protocol map protocolDict = {'tcp': socket.IPPROTO_TCP, 'udp': socket.IPPROTO_UDP} class Options(usage.Options): """ To use it, create a file named `sample-inetd.conf` with: 8123 stream tcp wait some_user /bin/cat - You can then run it as in the following example and port 8123 became an echo server. twistd -n inetd -f sample-inetd.conf """ optParameters = [ ['rpc', 'r', '/etc/rpc', 'DEPRECATED. RPC procedure table file'], ['file', 'f', '/etc/inetd.conf', 'Service configuration file'] ] optFlags = [['nointernal', 'i', "Don't run internal services"]] compData = usage.Completions( optActions={"file": usage.CompleteFiles('*.conf')} ) def makeService(config): s = appservice.MultiService() conf = inetdconf.InetdConf() with open(config['file']) as f: conf.parseFile(f) for service in conf.services: protocol = service.protocol if service.protocol.startswith('rpc/'): log.msg('Skipping rpc service due to lack of rpc support') continue if (protocol, service.socketType) not in [('tcp', 'stream'), ('udp', 'dgram')]: log.msg('Skipping unsupported type/protocol: %s/%s' % (service.socketType, service.protocol)) continue # Convert the username into a uid (if necessary) try: service.user = int(service.user) except ValueError: try: service.user = pwd.getpwnam(service.user)[2] except KeyError: log.msg('Unknown user: ' + service.user) continue # Convert the group name into a gid (if necessary) if service.group is None: # If no group was specified, use the user's primary group service.group = pwd.getpwuid(service.user)[3] else: try: service.group = int(service.group) except ValueError: try: service.group = grp.getgrnam(service.group)[2] except KeyError: log.msg('Unknown group: ' + service.group) continue if service.program == 'internal': if config['nointernal']: continue # Internal services can use a standard ServerFactory if service.name not in inetd.internalProtocols: log.msg('Unknown internal service: ' + service.name) continue factory = ServerFactory() factory.protocol = inetd.internalProtocols[service.name] else: factory = inetd.InetdFactory(service) if protocol == 'tcp': internet.TCPServer(service.port, factory).setServiceParent(s) elif protocol == 'udp': raise RuntimeError("not supporting UDP") return s