Class: Mu::Pcap::SCTP::Parameter

Inherits:
Packet
  • Object
show all
Defined in:
lib/diy/parser/mu/pcap/sctp/parameter.rb,
lib/diy/parser/mu/pcap/sctp/parameter/ip_address.rb

Direct Known Subclasses

IpAddress

Defined Under Namespace

Classes: IpAddress

Constant Summary

Constants inherited from Packet

Packet::IGNORE_UDP_PORTS

Instance Attribute Summary collapse

Attributes inherited from Packet

#payload, #payload_raw

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Packet

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

Constructor Details

#initialize ⇒ Parameter

Returns a new instance of Parameter.



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# File 'lib/diy/parser/mu/pcap/sctp/parameter.rb', line 12

def initialize
    super
    
    @type  = 0
    @size  = 0
end

Instance Attribute Details

#size ⇒ Object

Returns the value of attribute size.



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# File 'lib/diy/parser/mu/pcap/sctp/parameter.rb', line 10

def size
  @size
end

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/diy/parser/mu/pcap/sctp/parameter.rb', line 10

def type
  @type
end

Class Method Details

.dummy_parameter(type, size, bytes) ⇒ Object 



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# File 'lib/diy/parser/mu/pcap/sctp/parameter.rb', line 91

def self.dummy_parameter type, size, bytes
    # Create new dummy parameter
    parameter       = Parameter.new
    parameter.type  = type
    parameter.size  = size
    
    # Save the payload
    parameter.payload = bytes[4..parameter.padded_size - 1]
    parameter.payload_raw = parameter.payload

    # Return the result
    return parameter
end

.from_bytes(bytes) ⇒ Object 



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# File 'lib/diy/parser/mu/pcap/sctp/parameter.rb', line 19

def self.from_bytes bytes
    # Basic validation
    Pcap.assert(bytes.length >= 4,
                "Truncated parameter header: 4 > #{bytes.length}")
    
    # Read chunk header
    type, size = bytes.unpack('nn')
    
    # Validate chunk size
    Pcap.assert(bytes.length >= size,
                "Truncated parameter: #{size} set, #{bytes.length} available")
    
    # Create chunk based on type
    case type
        when PARAM_IPV4
            parameter = IpAddress.from_bytes(type, size, bytes[4..-1])
        when PARAM_IPV6
            parameter = IpAddress.from_bytes(type, size, bytes[4..-1])
        when PARAM_STATE_COOKIE
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_COOKIE_PRESERVATIVE
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_HOST_NAME_ADDR
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_SUPPORTED_ADDR_TYPES
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_ECN
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_RANDOM
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_CHUNK_LIST
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_HMAC_ALGORITHM
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_PADDING
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_SUPPORTED_EXTENSIONS
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_FORWARD_TSN
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_SET_PRIMARY_ADDR
            parameter = dummy_parameter(type, size, bytes)
        when PARAM_ADAPTATION_LAYER_INDICATION
            parameter = dummy_parameter(type, size, bytes)
        else
            parameter = dummy_parameter(type, size, bytes)
    end
    
    # Return the result
    return parameter
end

Instance Method Details

#padded_size ⇒ Object 



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# File 'lib/diy/parser/mu/pcap/sctp/parameter.rb', line 79

def padded_size
    if 0 == @size % 4
        return @size
    else
        return (@size + 4 - (@size % 4))
    end
end

#to_s ⇒ Object 



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# File 'lib/diy/parser/mu/pcap/sctp/parameter.rb', line 87

def to_s
    return "parameter(%d, %d)" % [@type, @size]
end

#write(io, ip) ⇒ Object 



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# File 'lib/diy/parser/mu/pcap/sctp/parameter.rb', line 71

def write io, ip
    header = [@type, @size].pack('nn')
    
    # Write Parameter header followed by the payload
    io.write(header)
    io.write(@payload_raw)
end