dhcp解析dns

import socket
import struct

def request_ip_address(server_ip, mac_address):
    # DHCP discover packet
    discover_packet = struct.pack('!BBBBIHHII6s10s',
                                  1, 1, 6, 0, 1234, 0, 0, 0, 0,
                                  b'\x00'*6, b'\x00'*10)
    
    # Send discover packet to DHCP server
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    sock.sendto(discover_packet, (server_ip, 67))
    
    # Receive offer packet from DHCP server
    data, _ = sock.recvfrom(1024)
    offer_packet = struct.unpack('!BBBBIHHII6s10s', data)
    
    # DHCP request packet
    request_packet = struct.pack('!BBBBIHHII6s10s',
                                 1, 1, 6, 0, 1234, 0, 0, 0, 0,
                                 mac_address, b'\x00'*10)
    request_packet += struct.pack('!BII', 53, 1, len(offer_packet[20:28]))
    request_packet += offer_packet[20:28]
    
    # Send request packet to DHCP server
    sock.sendto(request_packet, (server_ip, 67))
    
    # Receive ACK packet from DHCP server
    data, _ = sock.recvfrom(1024)
    ack_packet = struct.unpack('!BBBBIHHII6s10s', data)
    
    # Extract assigned IP address
    ip_address = '.'.join(map(str, ack_packet[20:24]))
    return ip_address

# Example usage
server_ip = '192.168.1.1'
mac_address = b'\x00\x1A\x2B\x3C\x4D\x5E'
ip_address = request_ip_address(server_ip, mac_address)
print(f'Assigned IP address: {ip_address}')