import socket
import struct

def test_ad_block(server_ip, domain="pagead2.googlesyndication.com"):
    header = struct.pack(">HHHHHH", 0x1234, 0x0100, 1, 0, 0, 0)
    qname = b"".join(bytes([len(p)]) + p.encode("ascii") for p in domain.split(".")) + b"\x00"
    qtype_qclass = struct.pack(">HH", 1, 1)
    packet = header + qname + qtype_qclass

    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.settimeout(3.0)
    try:
        sock.sendto(packet, (server_ip, 53))
        resp, _ = sock.recvfrom(1024)
        # Parse answer IP (last 4 bytes of standard A record answer)
        if len(resp) >= 32:
            ip = ".".join(str(b) for b in resp[-4:])
            print(f"Server {server_ip} returned for {domain} -> {ip}")
            if ip in ["0.0.0.0", "127.0.0.1"]:
                print(f"  [VERIFIED] Ad domain {domain} was BLOCKED (0.0.0.0)!")
    except Exception as e:
        print(f"Error querying {server_ip}: {e}")
    finally:
        sock.close()

test_ad_block("140.44.4.36")
test_ad_block("140.44.4.65")