Python客户端syn连接实例

环境 

• pip install  impacket（网络包）

实例

import sys
import socket
from impacket import ImpactDecoder, ImpactPacket
import time
 
def main():
 
    if len(sys.argv) < 3:
        print ("Use: %s <src ip> <dst ip>" % sys.argv[0])
        print ("Use: %s <src ip> <dst ip> <cnt>" % sys.argv[0])
        sys.exit(1)
    elif len(sys.argv) == 3:
        src = sys.argv[1]
        dst = sys.argv[2]
        cnt = 1
    elif len(sys.argv) ==4:
        src = sys.argv[1]
        dst = sys.argv[2]
        cnt = sys.argv[3]
    else:
        print ("Input error!")
        sys.exit(1)
#print src, dst
    ip = ImpactPacket.IP()
    ip.set_ip_src(src)
    ip.set_ip_dst(dst)
 
    # Create a new ICMP packet of type ECHO.
    tcp = ImpactPacket.TCP()
    tcp.set_th_sport(55968)
    tcp.set_th_dport(23)
    tcp.set_th_seq(1)
    tcp.set_th_ack(1)
    tcp.set_th_flags(0x18)
    tcp.set_th_win(64)
 
    ip.contains(tcp)
 
    # Open a raw socket. Special permissions are usually required.
    s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP)
    s.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
    seq_id = 0
    while cnt >= 1:
        # Calculate its checksum.
        seq_id = seq_id + 1
        tcp.set_th_seq(seq_id)
        tcp.calculate_checksum()
 
        # Send it to the target host.
        s.sendto(ip.get_packet(), (dst,23))
        cnt= cnt -1

    while True:
        data = s.recv(1024)
        print (data.decode())
        time.sleep(10)
        
 
if __name__ == '__main__':
    main()