UpnpPunch.py 文件源码

def _m_search_ssdp(local_ip):
    """
    Broadcast a UDP SSDP M-SEARCH packet and return response.
    """
    search_target = "urn:schemas-upnp-org:device:InternetGatewayDevice:1"

    ssdp_request = ''.join(
        ['M-SEARCH * HTTP/1.1\r\n',
         'HOST: 239.255.255.250:1900\r\n',
         'MAN: "ssdp:discover"\r\n',
         'MX: 2\r\n',
         'ST: {0}\r\n'.format(search_target),
         '\r\n']
    )

    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

    sock.bind((local_ip, 10000))

    sock.sendto(ssdp_request, ('239.255.255.250', 1900))
    if local_ip == "127.0.0.1":
        sock.settimeout(1)
    else:
        sock.settimeout(5)

    try:
        return sock.recv(2048)
    except socket.error, err:
        # no reply from IGD, possibly no IGD on LAN
        logging.debug("UDP SSDP M-SEARCH send error using ip %s: %s" % (local_ip, err))
        return False