Python Network Programming

How it works...

This recipe uses the sniff() and wrpacp() utility functions of the Scapy library to capture all the network packets and dump them onto a file. After capturing a packet via sniff(), the write_cap() function is called on that packet. Some global variables are used to work on packets one after another. For example, packets are stored in a pkts[] list and packet and variable counts are used. When the value of the count is 3, the pkts list is dumped onto a file named pcap1.pcap, the count variable is reset so that we can continue capturing another three packets and dumped onto pcap2.pcap, and so on.

In the test_dump_file() function, assume the presence of the first dump file, pcap1.dump, in the working directory. Now, sniff()