[BUG] Sniffer performance issue due to limits of Scapy library

[AleksaMCode]

Is there an existing issue for this?

• I have searched the existing issues

Description

When capturing Probe Requests with both, the PNLS and Airodump-ng, I've noticed that not all SSIDs are displayed on PNLS web UI.

System information

1. Kali Linux
2. 2023.3
3. Raspberry Pi 4

Actual Behavior

Some of the packets are never captured in moments of heavy packet loads.

Expected Behavior

To capture all of the packets.

Steps To Reproduce

Run the PNLS normally.

Anything else?

Scapy doesn't handle heavy loads very well because it processes packets too slowly. The load could be decreased, if you make the OS filter the packets instead of Scapy, which can be done when using the filter= argument.

Here are some useful links:

• Scapy AsyncSniffer can miss packets when many are sent
• Performance of Scapy

[AleksaMCode]

Also, in addition to looking into Scapy, the parser function could be updated.

• A Deque could be added as a structure where data from the parser will be temporary stored instead of sending it directly through a socket.
  

  Preferred-Network-List-Sniffer/sniffer/parser.py

  Lines 25 to 34 in bc2023a

  	web_socket.send(
  	json.dumps(
  	{
  	"ssid": ssid,
  	"timestamp": datetime.utcfromtimestamp(
  	float(packet.time)
  	).strftime(TIMESTAMP_FORMAT)[:-3],
  	}
  	)
  	)

• Another Thread will then read data from the shared Deque and send it over the publishing socket connection.