Python 从 Wireshark 捕获文件 pcap 解析 DNS 的库

Question

我从 Python 开始。我有一个由 Wireshark 捕获的 .pcap 文件，其中包含 DNS 查询和响应。我需要打开这个文件并提取请求的主机名和返回的记录类型和 IP 地址。我发现了几个能够读取 pcap 文件的库，但我不知道哪个最适合这个。可以推荐一下吗？

Answer 1

Scapy 不错。

from scapy.all import *
from scapy.layers.dns import DNS, DNSQR

types = {0: 'ANY', 255: 'ALL',1: 'A', 2: 'NS', 3: 'MD', 4: 'MD', 5: 'CNAME',
         6: 'SOA', 7:  'MB',8: 'MG',9: 'MR',10: 'NULL',11: 'WKS',12: 'PTR',
         13: 'HINFO',14: 'MINFO',15: 'MX',16: 'TXT',17: 'RP',18: 'AFSDB',
         28: 'AAAA', 33: 'SRV',38: 'A6',39: 'DNAME'}

dns_packets = rdpcap('file.pcap')
for packet in dns_packets:
    if packet.haslayer(DNS):
        print(packet.show())
        dst = packet[IP].dst
        rec_type = packet[DNSQR].qtype
        print(dst, types[rec_type])

输出示例：

###[ Ethernet ]###
  dst       = 00:16:e3:19:27:15
  src       = 00:04:76:96:7b:da
  type      = 0x800
###[ IP ]###
     version   = 4L
     ihl       = 5L
     tos       = 0x0
     len       = 70
     id        = 0
     flags     = DF
     frag      = 0L
     ttl       = 64
     proto     = udp
     chksum    = 0xb753
     src       = 192.168.1.2
     dst       = 192.168.1.1
     \options   \
###[ UDP ]###
        sport     = 2128
        dport     = domain
        len       = 50
        chksum    = 0x8397
###[ DNS ]###
           id        = 12575
           qr        = 0L
           opcode    = QUERY
           aa        = 0L
           tc        = 0L
           rd        = 1L
           ra        = 0L
           z         = 0L
           ad        = 0L
           cd        = 0L
           rcode     = ok
           qdcount   = 1
           ancount   = 0
           nscount   = 0
           arcount   = 0
           \qd        \
            |###[ DNS Question Record ]###
            |  qname     = '2.1.168.192.in-addr.arpa.'
            |  qtype     = PTR
            |  qclass    = IN
           an        = None
           ns        = None
           ar        = None

('192.168.1.1', 'PTR')

最后一行是外发IP地址和记录类型。资料一堆，正好select你需要的

Python 从 Wireshark 捕获文件 pcap 解析 DNS 的库

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