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python原始套接字編程示例分享

更新時間：2014年02月21日 16:20:31 作者：

在實驗中需要自己構(gòu)造單獨的HTTP數(shù)據(jù)報文，而使用SOCK_STREAM進行發(fā)送數(shù)據(jù)包，需要進行完整的TCP交互。因此想使用原始套接字進行編程，直接構(gòu)造數(shù)據(jù)包，并在IP層進行發(fā)送，即采用SOCK_RAW進行數(shù)據(jù)發(fā)送。使用SOCK_RAW的優(yōu)勢是，可以對數(shù)據(jù)包進行完整的修改，可以處理IP層上的所有數(shù)據(jù)包，對各字段進行修改，而不受UDP和TCP的限制。

下面開始構(gòu)造HTTP數(shù)據(jù)包，

IP層和TCP層使用python的Impacket庫，http內(nèi)容自行填寫。

復(fù)制代碼代碼如下:

#!/usr/bin/env python

#-------------------------------------------------------------------------------
# Name:     raw_http.py
# Purpose:       construct a raw http get packet
#
# Author:    Yangjun
#
# Created:       08/02/2014
# Copyright:   (c) Yangjun 2014
# Licence:       <your licence>
#-------------------------------------------------------------------------------

import sys
import socket
from impacket import ImpactDecoder, ImpactPacket

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.
    icmp = ImpactPacket.ICMP()
    tcp = ImpactPacket.TCP()
    tcp.set_th_sport(55968)
    tcp.set_th_dport(80)
    tcp.set_th_seq(1)
    tcp.set_th_ack(1)
    tcp.set_th_flags(0x18)
    tcp.set_th_win(64)

    tcp.contains( ImpactPacket.Data("GET /att/DIYLife/41264/528 HTTP/1.1\r\nHost: 192.168.111.1\r\nAccept-Encoding: identity\r\n\r\n"))

    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,80))
        cnt= cnt -1

if __name__ == '__main__':
    main()