如何使用Python-Scapy或类似的工具创建项目中的HTTP GET请求

Answer 1

如果你想做一个完整的三方握手，你必须手动完成。

从你的SYN包开始：

>>> syn = IP(dst='www.google.com') / TCP(dport=80, flags='S')
>>> syn
<IP  frag=0 proto=tcp dst=Net('www.google.com') |<TCP  dport=www flags=S |>>

然后从服务器接收SYN-ACK包，sr1工作。然后发送HTTP GET请求：

>>> syn_ack = sr1(syn)
Begin emission:
Finished to send 1 packets.
*
Received 1 packets, got 1 answers, remaining 0 packets

>>> syn_ack
<IP  version=4L ihl=5L tos=0x0 len=44 id=424 flags= frag=0L ttl=55 proto=tcp chksum=0x2caa src=74.125.226.148 dst=10.20.30.40 options=[] |<TCP  sport=www dport=ftp_data seq=3833491143 ack=1 dataofs=6L reserved=0L flags=SA window=5720 chksum=0xd8b6 urgptr=0 options=[('MSS', 1430)] |<Padding  load='\x00\x00' |>>>

然后设置TCP序列号和ack号并发送GET：

getStr = 'GET / HTTP/1.1\r\nHost: www.google.com\r\n\r\n'
request = IP(dst='www.google.com') / TCP(dport=80, sport=syn_ack[TCP].dport,
             seq=syn_ack[TCP].ack, ack=syn_ack[TCP].seq + 1, flags='A') / getStr
reply = sr1(request)

Answer 2

FTR，从Scapy 2.4.3开始，在名为“TCP_client”的util中实现了对HTTP数据包的剖析，以自动执行3次握手。

虽然它不像上面的答案那样教诲人，但看一眼也没什么坏处：https://scapy.readthedocs.io/en/latest/layers/http.html#use-scapy-to-send-receive-http-1-x

load_layer("http")
req = HTTP()/HTTPRequest(
    Accept_Encoding=b'gzip, deflate',
    Cache_Control=b'no-cache',
    Connection=b'keep-alive',
    Host=b'www.secdev.org',
    Pragma=b'no-cache'
)
a = TCP_client.tcplink(HTTP, "www.secdev.org", 80)
answser = a.sr1(req)
a.close()

Answer 3

你看过the tutorial吗？只是复制和粘贴，这看起来像是要组合一个HTTP请求：

>>>  a=Ether()/IP(dst="www.slashdot.org")/TCP()/"GET /index.html HTTP/1.0 \n\n"