Object Layer
Packet contents at a given protocol layer.
Methods
| Name | In | Out | Description |
|---|---|---|---|
| layer_bytes | number | Number of bytes at this layer. Example: UDP layer has 8 bytes | |
| protocol_id | a GUID | The GUID of the protocol | |
| rawbytes | a Buffer object | Raw bytes | |
| total_bytes | number | Total number bytes in the packet, i.e. same as Packet:wire_length() | |
| packet | a Packet object | The full packet | |
| testbit | bitno | bool | Test if a bit is set in this layer. Bits are numbered serially from 0 to 8*layer_bytes-1 This is a shortcut for layer:rawbytes():hval_8(bitno/8) You are encouraged to use testbit because it increases performance by reducing Lua-C round trips. |
| getbyte | offset | number | Get a byte at this offset. Shortcut for layer:rawbytes():hval_8(offset) You are encouraged to use getbyte because it increases performance by reducing Lua-C round trips. |
| flowkey | string | get the flowkey string for the packet. this is equivalent to layer:packet():flowid():id() but more efficient by avoiding 3 round trips. |