Class: Mu::Pcap::SCTP::Chunk::InitAck

Inherits:
Init show all
Defined in:
lib/diy/parser/mu/pcap/sctp/chunk/init_ack.rb

Constant Summary

Constants inherited from Packet

Packet::IGNORE_UDP_PORTS

Instance Attribute Summary

Attributes inherited from Init

#a_rwnd, #i_streams, #init_tag, #init_tsn, #o_streams

Attributes inherited from Mu::Pcap::SCTP::Chunk

#flags, #size, #type

Attributes inherited from Packet

#payload, #payload_raw

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Init

#<<, #write

Methods inherited from Mu::Pcap::SCTP::Chunk

dummy_chunk, #padded_size, #write

Methods inherited from Packet

#==, #deepdup, #flow_id, isolate_l7, normalize, #payload_bytes, #to_bytes

Constructor Details

#initialize ⇒ InitAck

Returns a new instance of InitAck.



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# File 'lib/diy/parser/mu/pcap/sctp/chunk/init_ack.rb', line 11

def initialize
    super
    
    @type = CHUNK_INIT_ACK
end

Class Method Details

.from_bytes(flags, size, bytes) ⇒ Object 



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# File 'lib/diy/parser/mu/pcap/sctp/chunk/init_ack.rb', line 17

def self.from_bytes flags, size, bytes
    # Basic validation
    Pcap.assert(bytes.length >= 16,
                "Truncated init_ack chunk header: 16 > #{bytes.length}")
    
    # Read init_ack chunk header
    init_tag, a_rwnd, o_streams, i_streams, init_tsn = bytes.unpack('NNnnN')
    
    # Create init chunk
    init_ack           = InitAck.new
    init_ack.flags     = flags
    init_ack.size      = size
    init_ack.init_tag  = init_tag
    init_ack.a_rwnd    = a_rwnd
    init_ack.o_streams = o_streams
    init_ack.i_streams = i_streams
    init_ack.init_tsn  = init_tsn
    
    # Initialize the counter
    length = 16
    
    # Collect the chunks
    while length < bytes.length
        # Parse new parameter from the bytes
        parameter = Parameter.from_bytes(bytes[length..-1])
        
        # Get parameter size with padding
        length += parameter.padded_size
        
        # Add chunk to the list
        init_ack << parameter
    end
    
    # Return the result
    return init_ack
end

Instance Method Details

#to_s ⇒ Object 



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# File 'lib/diy/parser/mu/pcap/sctp/chunk/init_ack.rb', line 54

def to_s
    return "init_ack(%d, %d, %d, %d, %d, %d, %s)" % [@size,
                                                     @init_tag,
                                                     @a_rwnd,
                                                     @o_streams,
                                                     @i_streams,
                                                     @init_tsn,
                                                     @payload.join(", ")]
end