def __init__(self, broadcast = True, listen_port = 0):
"""
Instantiate a NetBIOS instance, and creates a IPv4 UDP socket to listen/send NBNS packets.
:param boolean broadcast: A boolean flag to indicate if we should setup the listening UDP port in broadcast mode
:param integer listen_port: Specifies the UDP port number to bind to for listening. If zero, OS will automatically select a free port number.
"""
self.broadcast = broadcast
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
if self.broadcast:
self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
if listen_port:
self.sock.bind(( '', listen_port ))
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