[英]Scapy: How to insert a new layer (802.1q) into existing packet?
I have a packet dump and want to inject a vlan tag (802.1q header) to the packets. 我有一个数据包转储,并希望向数据包注入vlan标记(802.1q标头)。
How to do that? 怎么做?
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. 为了找到答案,我看了一下Scapy:插入一个新图层和记录问题 ,这确实很有用,但包含了一些内容。
My solution for adding a layer, based on the referenced question (add-dot1q_pcap.py): 我根据引用的问题(add-dot1q_pcap.py)添加图层的解决方案:
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)
The script adds a vlan tag with vlan id 42. 该脚本添加了vlan id为42的vlan标记。
Usage: ./add-dot1q_pcap.py <source_file> <output_file>
用法: ./add-dot1q_pcap.py <source_file> <output_file>
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