用python模拟TCP3次握手连接及发送数据
源码如下：
1 from scapy.all import * 2 3 4 import logging 5 logging.getLogger('scapy.runtime').setLevel(logging.ERROR) 6 7 target_ip = '192.168.1.1' 8 target_port = 80 9 data = 'GET / HTTP/1.0 \r\n\r\n' 10 11 def start_tcp(target_ip,target_port): 12 global sport,s_seq,d_seq #主要是用于TCP3此握手建立连接后继续发送数据 13 try: 14 #第一次握手，发送SYN包 15 ans = sr1(IP(dst=target_ip)/TCP(dport=target_port,sport=RandShort(),seq=RandInt(),flags='S'),verbose=False) 16 sport = ans[TCP].dport #源随机端口 17 s_seq = ans[TCP].ack #源序列号（其实初始值已经被服务端加1） 18 d_seq = ans[TCP].seq + 1 #确认号，需要把服务端的序列号加1 19 #第三次握手，发送ACK确认包 20 send(IP(dst=target_ip)/TCP(dport=target_port,sport=sport,ack=d_seq,seq=s_seq,flags='A'),verbose=False) 21 except Exception,e: 22 print '[-]有错误，请注意检查！' 23 print e 24 25 def trans_data(target_ip,target_port,data): 26 #先建立TCP连接 27 start_tcp(target_ip=target_ip,target_port=target_port) 28 #print sport,s_seq,d_seq 29 #发起GET请求 30 ans = sr1(IP(dst=target_ip)/TCP(dport=target_port,sport=sport,seq=s_seq,ack=d_seq,flags=24)/data,verbose=False) 31 #ans.show() 32 #读取服务端发来的数据 33 rcv = ans[Raw] 34 print rcv 35 36 if __name__ == '__main__': 37 #start_tcp(target_ip,target_port) 38 trans_data(target_ip,target_port,data)
运行结果如下：
1 # python exp3.py 2 <meta http-equiv="Pragma" content="no-cache"> 3 <meta http-equiv="Expires" content="wed, 26 Feb 1997 08:21:57 GMT"> 4 <html><head><title>505 HTTP Version not supported</title></head><body><center><h1>505 HTTP Version not supported</h1></center></body></html>�p�-1���-1��2��2��D ��o�p�-1��`��D
wireshark抓包截图如下：
