resolver_ares.py 文件源码

def _lookup_port(self, port, socktype):
        socktypes = []
        if isinstance(port, string_types):
            try:
                port = int(port)
            except ValueError:
                try:
                    if socktype == 0:
                        origport = port
                        try:
                            port = getservbyname(port, 'tcp')
                            socktypes.append(SOCK_STREAM)
                        except error:
                            port = getservbyname(port, 'udp')
                            socktypes.append(SOCK_DGRAM)
                        else:
                            try:
                                if port == getservbyname(origport, 'udp'):
                                    socktypes.append(SOCK_DGRAM)
                            except error:
                                pass
                    elif socktype == SOCK_STREAM:
                        port = getservbyname(port, 'tcp')
                    elif socktype == SOCK_DGRAM:
                        port = getservbyname(port, 'udp')
                    else:
                        raise gaierror(EAI_SERVICE, 'Servname not supported for ai_socktype')
                except error:
                    ex = sys.exc_info()[1]
                    if 'not found' in str(ex):
                        raise gaierror(EAI_SERVICE, 'Servname not supported for ai_socktype')
                    else:
                        raise gaierror(str(ex))
                except UnicodeEncodeError:
                    raise error('Int or String expected')
        elif port is None:
            port = 0
        elif isinstance(port, int):
            pass
        else:
            raise error('Int or String expected')
        port = int(port % 65536)
        if not socktypes and socktype:
            socktypes.append(socktype)
        return port, socktypes