Constructor
new TCP()
Properties| Name | Type | Description |
|---|---|---|
src | number | Source TCP port. |
dst | number | Destination TCP port. |
seq | number | Sequence number. |
ack | number | Acknowledgment number. |
windowSize | number | The size of the receive window, which specifies the number of window size units (by default, bytes). |
checksum | number | The 16-bit checksum field is used for error-checking of the header and data. |
urgentPointer | number | If the URG flag is set, then this 16-bit field is an offset from the sequence number indicating the last urgent data byte. |
flags | TCPFlags | TCP flags. |
- Implements
- Source
Members
flags :TCPFlags
Get the flags object. Changes to this object will update the associated buffer.
Type:
- Source
length :number
Number of bytes occupied by the layer.
Type:
- number
- Implements
- Source
options :Iterable.<TLVOption>
TLV options;
Type:
- Iterable.<TLVOption>
- Source
osi :OsiModelLayers
Respective protocol OSI layer.
Type:
- Implements
- Source
Methods
calculateChecksum()
Calculates and updates the checksum for the TCP layer. This method mutates the object by setting the `checksum` property based on the current state of the `buffer` and `prev` field.
- Source
toObject() → {Object}
Retrieves all fields of the TCP layer.
- Implements
- Source
Returns:
The TCP layer fields as an object.
- Type:
- Object
Example
tcp.toObject();
// {
// src: 52622,
// dst: 24043,
// seq: 3994458414,
// ack: 3198720281,
// dataOffset: 8,
// windowSize: 2048,
// checksum: 3346,
// urgentPointer: 0,
// flags: {
// reserved: 0,
// cwr: 0,
// ece: 0,
// urg: 0,
// ack: 1,
// psh: 0,
// rst: 0,
// syn: 0,
// fin: 0
// },
// options: [
// { type: 1 },
// { type: 1 },
// { type: 8, recLength: 10, value: Buffer.from([0x52, 0xd3, 0xc6, 0x50, 0xdd, 0x04, 0xcd, 0xd6]) }
// ],
// }