dns数据包解析代码

import socket

def dns_packet_parse(packet):
    # 解析DNS报文头部
    header = packet[:12]
    id = int.from_bytes(header[:2], byteorder='big')
    flags = int.from_bytes(header[2:4], byteorder='big')
    qdcount = int.from_bytes(header[4:6], byteorder='big')
    ancount = int.from_bytes(header[6:8], byteorder='big')
    nscount = int.from_bytes(header[8:10], byteorder='big')
    arcount = int.from_bytes(header[10:12], byteorder='big')

    # 解析DNS查询部分
    queries = []
    offset = 12
    for _ in range(qdcount):
        qname = ''
        while True:
            length = packet[offset]
            if length == 0:
                offset += 1
                break
            qname += packet[offset+1:offset+1+length].decode('utf-8') + '.'
            offset += length + 1
        qtype = int.from_bytes(packet[offset:offset+2], byteorder='big')
        qclass = int.from_bytes(packet[offset+2:offset+4], byteorder='big')
        offset += 4
        queries.append((qname, qtype, qclass))

    # 解析DNS回答部分
    answers = []
    for _ in range(ancount):
        # 解析每个回答的名称、类型、类、TTL和数据长度
        # 解析不同类型的记录数据
        pass

    return id, flags, queries, answers

# 示例用法
packet = b'\x00\x01\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x03www\x06google\x03com\x00\x00\x01\x00\x01'
id, flags, queries, answers = dns_packet_parse(packet)
print(f'ID: {id}')
print(f'Flags: {flags}')
print(f'Queries: {queries}')
print(f'Answers: {answers}')