packet.transport.tcp (3) Linux Manual Page

packet.transport.tcp – TCP module

Description

Decode TCP layer.

Classes

class Flags(baseobj.BaseObj)

Flags object
Methods defined here:
---------------------
__init__(self, data)
Constructor which takes a short integer as input

class TCP(baseobj.BaseObj)

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_raw = int, # Raw flags
 flags = Flags( # Individual 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 = string, # Raw data of TCP options if available
 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: ACK,FIN'

See Also

baseobj(3), packet.application.rpc(3)

Bugs

No known bugs.

Author

Jorge Mora (mora [at] netapp.com)