Scapy REPL demo

[nirs]

Summary

Add a Python demo/tool that uses vmnet-helper to provide an interactive Scapy REPL for vmnet networks. This allows sending and receiving raw Ethernet frames to/from any VM or external host.

Motivation

Normally, raw Ethernet access requires root privileges. vmnet-helper provides unprivileged access to vmnet networks via a file descriptor, making it possible to:

• Debug VM networking - see what's on the wire
• Learn networking - craft packets interactively
• Test connectivity between VMs
• Security testing - inject traffic into VM network

Example usage

from scapy.all import *
import vmnet_helper

# Get file descriptor for the shared network
fd = vmnet_helper.acquire("shared")

# Sniff traffic
sniff(fd=fd, count=5)

# Send ARP request
sendp(Ether()/ARP(pdst="192.168.105.2"), fd=fd)

# Ping external host via vmnet gateway
sendp(Ether()/IP(dst="8.8.8.8")/ICMP(), fd=fd)

[nirs]

We can reuse the infrastructure in the quick tests.