packet.transport.tcp - Man Page

TCP Option flags


Methods defined here:
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__str__ = str_flags(self)
Display the flag names which are set, e.g., in the above example
the output will be "bit1,bit3" (bit1=1, bit3=1)
Use "__str__ = OptionFlags.str_flags" to have it as the default
string representation

Option object


Methods defined here:
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__init__(self, unpack)
Constructor which takes an unpack object as input

TCP stream buffer object


Methods defined here:
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__init__(self, seqno)

add_fragment(self, data, seq)
Add fragment data to stream buffer

missing_fragment(self, seq)
Check if given sequence number is within a missing fragment

TCP object

Usage:
    from packet.transport.tcp import TCP

    x = TCP(pktt)

Object definition:

TCP(
    src_port    = int, # Source port
    dst_port    = int, # Destination port
    seq_number  = int, # Sequence number
    ack_number  = int, # Acknowledgment number
    hl          = int, # Data offset or header length (32bit words)
    header_size = int, # Data offset or header length in bytes
    flags = Flags(     # TCP flags:
        rawflags = int,#   Raw flags
        FIN = int,     #   No more data from sender
        SYN = int,     #   Synchronize sequence numbers
        RST = int,     #   Synchronize sequence numbers
        PSH = int,     #   Push function. Asks to push the buffered
                       #     data to the receiving application
        ACK = int,     #   Acknowledgment field is significant
        URG = int,     #   Urgent pointer field is significant
        ECE = int,     #   ECN-Echo has a dual role:
                       #     SYN=1, the TCP peer is ECN capable.
                       #     SYN=0, packet with Congestion Experienced
                       #     flag in IP header set is received during
                       #     normal transmission
        CWR = int,     #   Congestion Window Reduced
        NS  = int,     #   ECN-nonce concealment protection
    ),
    window_size = int, # Window size
    checksum    = int, # Checksum
    urgent_ptr  = int, # Urgent pointer
    seq         = int, # Relative sequence number
    options = list,    # List of TCP options
    data = string,     # Raw data of payload if unable to decode
)


Methods defined here:
---------------------

__init__(self, pktt)
Constructor

Initialize object's private data.

        pktt:
    Packet trace object (packet.pktt.Pktt) so this layer has
    access to the parent layers.

__str__(self)
String representation of object

The representation depends on the verbose level set by debug_repr().
If set to 0 the generic object representation is returned.
If set to 1 the representation of the object is condensed:
    'TCP 708 -> 2049, seq: 3294175829, ack: 3395739041, ACK,FIN'

If set to 2 the representation of the object also includes the
length of payload and a little bit more verbose:
    'src port 708 -> dst port 2049, seq: 3294175829, ack: 3395739041, len: 0, flags: FIN,ACK'