如何搭建TCP代理（三）

 
        # Ignore packets containing data we aren't interested
        # in.
        if hasattr(packet, 'qd') and packet.qd is not None:
            queried_host = packet.qd.qname[:-1].decode("utf-8")
            if queried_host is None:
                print("queried_host is None, dropping request")
                return
 
            # If the queried_host is one of the domains we want
            # to spoof, return the spoof_ip.
            if queried_host in spoof_domains:
                print("!!!! Spoofing DNS request for %s by %s !!!!"
                        % (queried_host, ip.src))
                resolved_ip = spoof_ip
            # Else use dns.resolver to make a real DNS "A record"
            # request, and return the result of that.
            else:
                print("Forwarding DNS request for %s by %s" %
                        (queried_host, ip.src))
                a_records = dns.resolver.query(queried_host, 'A')
                resolved_ip = a_records[0].address
 
            # Build the DNS answer
            dns_answer = scapy.DNSRR(
                rrname=queried_host + ".",
                ttl=330,
                type="A",
                rclass="IN",
                rdata=resolved_ip)
            # Build the DNS response by constructing the IP
            # packet, the UDP "datagram" that goes inside the
            # packet, and finally the DNS response that goes
            # inside the datagram.
            dns_response = /
                scapy.IP(src=ip.dst, dst=ip.src) / /
                scapy.UDP(
                    sport=udp.dport,
                    dport=udp.sport
                ) / /
                scapy.DNS(
                    id = packet[scapy.DNS].id,
                    qr = 1,
                    aa = 0,
                    rcode = 0,

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