Scapy:如何在现有数据包中插入新层(802.1q)? [英] Scapy: How to insert a new layer (802.1q) into existing packet?
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问题描述
我有一个数据包转储,想向数据包注入一个 vlan 标记(802.1q 标头).
如何做到这一点?
I have a packet dump and want to inject a vlan tag (802.1q header) to the packets.
How to do that?
推荐答案
为了找到答案,我查看了 Scapy: Inserting一个新的层和日志问题,这真的很有帮助,但包含一些细节.
To find the answer, I had a look at Scapy: Inserting a new layer and logging issues, which is really helpful, but contains some cruft.
我添加图层的解决方案,基于引用的问题 (add-dot1q_pcap.py):
My solution for adding a layer, based on the referenced question (add-dot1q_pcap.py):
import sys
from scapy.all import rdpcap, wrpcap, NoPayload, Ether, Dot1Q
# read all packets into buffer
# WARNING works only for small files
packets = []
for packet in rdpcap(sys.argv[1]):
# gets the first layer of the current packet
layer = packet.firstlayer()
# loop over the layers
while not isinstance(layer, NoPayload):
if 'chksum' in layer.default_fields:
del layer.chksum
if (type(layer) is Ether):
# adjust ether type
layer.type = 33024
# add 802.1q layer between Ether and IP
dot1q = Dot1Q(vlan=42)
dot1q.add_payload(layer.payload)
layer.remove_payload()
layer.add_payload(dot1q)
layer = dot1q
# advance to the next layer
layer = layer.payload
packets.append(packet)
wrpcap(sys.argv[2], packets)
脚本添加了一个 vlan id 为 42 的 vlan 标签.
The script adds a vlan tag with vlan id 42.
用法:./add-dot1q_pcap.py
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