- class os_ken.lib.packet.udp.udp(src_port=1, dst_port=1, total_length=0, csum=0)¶
UDP (RFC 768) header encoder/decoder class.
An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.
Length (0 means automatically-calculate when encoding)
Checksum (0 means automatically-calculate when encoding)
- static get_packet_type(src_port, dst_port)¶
Per-protocol dict-like get method.
Provided for convenience of protocol implementers. Internal use only.
- classmethod parser(buf)¶
Decode a protocol header.
This method is used only when decoding a packet.
Decode a protocol header at offset 0 in bytearray buf. Returns the following three objects.
An object to describe the decoded header.
A packet_base.PacketBase subclass appropriate for the rest of the packet. None when the rest of the packet should be considered as raw payload.
The rest of packet.
- serialize(payload, prev)¶
Encode a protocol header.
This method is used only when encoding a packet.
Encode a protocol header. Returns a bytearray which contains the header.
payload is the rest of the packet which will immediately follow this header.
prev is a packet_base.PacketBase subclass for the outer protocol header. prev is None if the current header is the outer-most. For example, prev is ipv4 or ipv6 for tcp.serialize.