dig without all options

dns-requester.py

#!/usr/bin/env python3

from scapy.all import *
import sys

if len(sys.argv) > 4:
    sys.stderr.out("error: ./dns-request.py query nameserver-ip [-a]")
sender = IP()/UDP()/DNS(qd=DNSQR(qname=sys.argv[1]))
print(sys.argv)
if len(sys.argv) > 3:
    sender[IP].dst = sys.argv[2]
else:
    resolv = open('/etc/resolv.conf', 'r').read().split('\n')
    for x in resolv:
        if 'nameserver' in x:
            nameserver = x.split(' ')[1]
            sender[IP].dst = nameserver
rec = sr1(sender)
if '-a' in sys.argv:
    sys.stdout.write(str(rec.show()))
else:
    sys.stdout.write(str(rec[DNS].an.show()))