Reading and writing to pcap files

The pcap files are used to save the captured packets for later use. We can read packets from a pcap file and write them to a pcap file using Scapy.

How to do it...

We can write a script to read and write pcap files with Scapy as follows:

1. We can import the pcap file to Scapy, as follows:

from scapy.all import *
packets = rdpcap("sample.pcap")
packets.summary()  

2. We can iterate and work with the packets as we did for the created packets:

for packet in packets:
    if packet.haslayer(UDP):
        print(packet.summary())  

3. We can also manipulate the packets during the import itself. If we want to change the destination and source MAC address of the packets in the captured pcap...