[网络协议]tcp/http 分析

tcp

tcpdump异常请求分析来源ip

tcpdump -s 0 -A 'tcp dst port 9200 and tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420'

http

tcpdump查看HTTP流量
查看HTTP GET请求
sudo tcpdump -s 0 -A 'tcp dst port 80 and tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420'
查看HTTP POST请求
sudo tcpdump -s 0 -A 'tcp dst port 80 and (tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354)'
查看HTTP请求响应头以及数据
sudo tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'
sudo tcpdump -X -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'