Is there any encapsulation software for constructing network protocol header?

Question

Is there any encapsulation software for constructing network protocol header?

You see my code, I can use struct.pack() to construct a ICMP packet.

import socket
import struct

rawsocket = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.getprotobyname('icmp'))
packet = struct.pack('!BBHHH13s', 8, 0, 0, 1, 0, b'qasdssdehello')
chksum = checksum(packet)

but, I think it is complicated and difficult to use, is there any open source code of encapsulation struct? so I can construct a protocol packet easily.

Answer 1

Scapy is library that allows construction of network packets, in a high-level way:

Example for ICMP ping:

ICMP Ping Classical ICMP Ping can be emulated using the following command:

ans, unans = sr(IP(dst="192.168.1.1-254")/ICMP())

Information on live hosts can be collected with the following request:

ans.summary(lambda s,r: r.sprintf("%IP.src% is alive") )