#!/usr/bin/env python3.6
import scapy.all as scapy
import argparse
def main():
# All code is in main function because no higher level wrapper functions are needed for scapy
# Argparse setup
parser = argparse.ArgumentParser(description="Packet sniffer")
parser.add_argument("--iface", type=str, help="interface to sniff")
parser.add_argument("--filter", type=str, help="bpf filter string")
parser.add_argument("--outfile", type=str, help="Pcap file to output")
args = parser.parse_args()
if not args.iface:
# Needs an interface
print("--iface required")
exit()
# Default Values for opts
outfile = "out.pcap"
filt = None
try:
pkts = scapy.sniff(filter=filt, iface=args.iface)
scapy.wrpcap(outfile, pkts)
except PermissionError:
# Raw sockets require root privs
print("Must run as root")
exit()
if __name__ == "__main__":
main()
