1. 代理服务器

1 # coding:utf8  2 # 创建一个 TCP 代理  3   4 import sys  5 import socket  6 import threading  7   8 def server_loop(local_host, local_port, remote_host, remote_port, receive_first):  9  10     server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 11     try: 12         # 服务器监听的 host和端口 13         server.bind((local_host, local_port)) 14     except Exception, e: 15         print "[!!] Failed to listen on %s:%d" % (local_host, local_port) 16         print "[!!] Check for other listening sockets or correct permissions" 17         sys.exit(0) 18      19     print "[*] Listening on %s:%d" % (local_host, local_port) 20      21     #开始监听TCP传入连接 22     server.listen(5) 23  24     while True: 25         # 获取客户端请求过来的数据 26         client_socket, addr = server.accept() 27  28         # 打印出本地客户端连接的信息 29         print "[==>] Received incoming connection from %s:%d" % (addr[0], addr[1]) 30          31         # 开启一个线程 与 远程主机通信 32         proxy_thread = threading.Thread(target=proxy_handler, args=(client_socket, remote_host, remote_port, receive_first)) 33          34         proxy_thread.start() 35  36  37 # 十六进制转储的函数 38 def hexdump(src, length=16): 39     result = [] 40     digits = 4 if isinstance(src, unicode) else 2 41  42     for i in xrange(0, len(src), length): 43         s = src[i:i+length] 44         hexa = b' ' . join(["%0*X" % (digits, ord(x)) for x in s]) 45         text = b''.join([x if 0x20 <= ord(x) < 0x7F else b'.' for x in s]) 46         result.append(b"%04X %-*s %s" % (i, length*(digits + 1), hexa, text)) 47  48     print b'\n'.join(result) 49  50 # 从远程服务器里面接受数据 51 def receive_from(connection): 52     print "receive_from function start ........... " 53     buffer = "" 54  55     # 我们设置了两秒的超时， 这取决于目标的情况， 可能需要调整 56     connection.settimeout(2) 57  58     try: 59         # 持续从缓存中读取数据直到没有数据或者超时 60         while True: 61             data = connection.recv(4096) 62             print "receive_from data is %s " % data 63             if not data: 64                 print "receive_from data is break ......." 65                 break 66  67             buffer += data 68  69     except Exception, e: 70         print str(e) 71         print str(Exception) 72         print 'error for receive_from' 73  74     return buffer 75  76 # 对目标是远程主机的请求进行修改 77 def request_handler(buffer): 78     #执行包修改 79     return buffer 80  81 # 对目标是本地主机的响应进行修改 82 def response_handler(buffer): 83     #执行包修改 84     return buffer 85      86  87  88 def proxy_handler(client_socket, remote_host, remote_port, receive_first): 89     # 连接远程主机 90     remote_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 91  92     print "remote_socket start ...... %s %d" % (remote_host, remote_port) 93     remote_socket.connect((remote_host, remote_port)) 94  95     # 如果必要从远程主机接收数据 96     if receive_first: 97         remote_buffer = receive_from(remote_socket) 98         hexdump(remote_buffer) 99 100         # 发送给我们的响应处理101         remote_buffer = response_handler(remote_buffer)102 103         # 如果我们有数据传递给本地客户端，发送它104         if len(remote_buffer):105             print "[<==] Sending %d bytes to localhost." % len(remote_buffer)106             client_socket.send(remote_buffer)107 108     # 现在我们从本地循环读取数据， 发送给远处主机和本地主机109     while True:110         # 从本地读取数据111         local_buffer = receive_from(client_socket)112         print "local_buffer is %s " % local_buffer113         if len(local_buffer):114             print "[==>] Received %d bytes from localhost." % len(local_buffer)115             hexdump(local_buffer)116 117             # 这里可以改变我们请求的数据 过滤等功能118             local_buffer = request_handler(local_buffer)119 120             # 向远处主机发送数据121             remote_socket.send(local_buffer)122             print "[==>] Sent to remote."123 124         # 接收响应的数据125         remote_buffer = receive_from(remote_socket)126         if len(remote_buffer):127             print "[<==] Received %d bytes from remote." % len(remote_buffer) 128             hexdump(remote_buffer)129 130             # 发送到响应处理函数131             remote_buffer = response_handler(remote_buffer)132 133             # 将响应发送给本地socket134             client_socket.send(remote_buffer)135 136         # 如果两边都没有数据， 关闭连接137         if not len(local_buffer) or not len(remote_buffer):138             client_socket.close()139             remote_socket.close()140             print "[*] No more data. Closing connections."141             sys.exit(0)142             break143 144         145 146 def main():147     if len(sys.argv[1:]) != 5:148         print "Usage: ./proxy.py [localhost] [localport] [remotehost] [remoteport] [receive_first]"149         print "Example: ./proxy.py 127.0.0.1 9000 10.12.132.1 9000 True"150         sys.exit(0)151 152     # 设置本地监听参数153     local_host = sys.argv[1]154     local_port = int(sys.argv[2])155 156     # 设置远程目标157     remote_host = sys.argv[3]158     remote_port = int(sys.argv[4])159 160     # 告诉代理在发送给远程主机之前连接和接受数据161     receive_first = sys.argv[5]162 163     if "True" in receive_first:164         receive_first = True165     else:166         receive_first = False167 168     # 设置好我们的监听 socket169     server_loop(local_host, local_port, remote_host, remote_port, receive_first)170 171 main()172 173 174 ##175 ##python index5.py 0.0.0.0 9999 120.25.249.52 80 True176 ##cd D:\python_code\httPython

这是我们的代理服务器，如果是在本地调试的话，电脑是windows系统.

python index5.py 0.0.0.0 9999 120.25.249.52 80 True  监听本地电脑的9999端口 然后发收到的信息发送到

120.25.249.52:80里面获取网页信息，120.25.249.52这个是我自己的网站。

2. TCP客户端

1 # coding:utf8 2  3 import socket 4  5 target_host = '127.0.0.1' 6 target_port = 9999 7  8 # 建立一个socket 对象  9 # socket.AF_INET表示IPv4地址，或者主机名10 # socket.SCOK_STREAM 这将是一个TCP客户端11 client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)12 13 # 连接客户端14 client.connect((target_host, target_port))15 16 # 发送一些数据17 client.send("GET / HTTP/1.1\r\nHost: chengzhier.com\r\n\r\n") # 这里不要直接打字符串，需要用http的形式请求 18 19 # 接收一些数据20 response = client.recv(4096)21 22 print response