0x00 前言
无聊之余看到XT博客说，使用python创建TCP代理，也来搞了一下，代码无优化，借鉴cnblogs大佬shaoshao的代码，进一步改良。只提供一个轮子，轮子之旅开始。
0x01 XT写的代码
import sys
import threading
import socket
def server_loop(local_host,local_port,remote_host,remote_port,receive_first):
server=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
try:
server.blind((local_host,local_port))
except:
print “[!!] Failed to listen on %s:%d” % (local_host,local_port)
print “[!!] Check for other listing sockets or correct permissions.”
sys.exit(0)
print “[*] Listening on %s:%d” % (local_host,local_port)
server.listen(5)
while True:
client_socket,addr=server.accept()
print “[==>] Received incoming connection from %s:%d %(addr[0],addr[1])”
proxy_thread=threading.Thread(target=proxy_handler,args=(client_socket,remote_host,remote_port,receive_first))
proxy_thread.start()
def proxy_handler(client_socket,remote_host,remote_port,receive_first):
remote_socket=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
remote_socket.connect((remote_host,remote_port))
if receive_first:
remote_buffer=receive_from(remote_socket)
hexdump(remote_buffer)
remote_buffer=response_handler(remote_buffer)
if len(remote_buffer):
print “[<==] Sening %d bytes to localhost.” % len(remote_buffer)
client_socket.send(remote_buffer)
while True:
local_buffer=receive_from(cilent_socket)
if len(local_buffer):
print “[==>] Received %d bytes from localhost.” % len(local_buffer)
hexdump(local_buffer)
local_buffer=request_handler(local_buffer)
remote_socket.send(local_buffer)
print “[==>] Send to remote.”
remote_buffer=receive_from(remote_socket)
if len(remote_buffer):
print “[<==] Received %d bytes from remote.” % len(remote_buffer)
hexdump(remote_buffer)
remote_buffer=response_handler(remote_buffer)
cilent_socket.send(remote_buffer)
print “[<==] Sent to localhost.”
if not len(local_buffer) or not len(remote_buffer):
client_socket.close()
remote_socket.close()
print “[*] No more data.Closing connection.”
break
def hexdump(src,length=16):
result=[]
digits=4 if isinstance(src,unicode) else 2
for i in xrange(0,len(src),length):
s=src[i:i+length]
hexa=b’ ‘.join([“%0*X” % (digits, ord(x)) for x in s])
text=b”.join([x if 0x20 <=ord(x) < 0x7F else b’.’ for x in s])
result.append( b”%04X %S” (i, length*(digits + 1),hexa,text))
print b’\n’,join(result)
def receive_from(connection):
buffer=””
connection.settimeout(2)
try:
while True:
data=connection.recv(4096)
if not data:
break
buffer += data
except:
pass
return buffer
def request_handler(buffer):
return buffer
def response_handler(buffer):
return buffer
def main():
if len(sys.argv[1:]) !=5:
print “Usage: ./proxy.py [localhost] [localport] [remotehost] [remoteport] [receive_first]”
print “Example: ./proxy.py 127.0.0.1 9000 10.12.132.1 9000 Ture”
sys.exit(0)
local_host=sys.argv[1]
local_port=int(sys.argv[2])
remote_host=sys.argv[3]
remote_port=int(sys.argv[4])
receive_first=sys.argv[5]
if “True” in receive_first:
receive_first=True
else:
receive_first=False
server_loop(local_host,local_port,remote_host,remote_port,receive_first)
main()
0x02 代理服务器
# coding:utf8
# 创建一个 TCP 代理
import sys
import socket
import threading
def server_loop(local_host, local_port, remote_host, remote_port, receive_first):
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
# 服务器监听的 host和端口
server.bind((local_host, local_port))
except Exception, e:
print "[!!] Failed to listen on %s:%d" % (local_host, local_port)
print "[!!] Check for other listening sockets or correct permissions"
sys.exit(0)
print "[*] Listening on %s:%d" % (local_host, local_port)
#开始监听TCP传入连接
server.listen(5)
while True:
# 获取客户端请求过来的数据
client_socket, addr = server.accept()
# 打印出本地客户端连接的信息
print "[==>] Received incoming connection from %s:%d" % (addr[0], addr[1])
# 开启一个线程 与 远程主机通信
proxy_thread = threading.Thread(target=proxy_handler, args=(client_socket, remote_host, remote_port, receive_first))
proxy_thread.start()
# 十六进制转储的函数
def hexdump(src, length=16):
result = []
digits = 4 if isinstance(src, unicode) else 2
for i in xrange(0, len(src), length):
s = src[i:i+length]
hexa = b' ' . join(["%0*X" % (digits, ord(x)) for x in s])
text = b''.join([x if 0x20 <= ord(x) < 0x7F else b'.' for x in s])
result.append(b"%04X %-*s %s" % (i, length*(digits + 1), hexa, text))
print b'\n'.join(result)
# 从远程服务器里面接受数据
def receive_from(connection):
print "receive_from function start ........... "
buffer = ""
# 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
connection.settimeout(2)
try:
# 持续从缓存中读取数据直到没有数据或者超时
while True:
data = connection.recv(4096)
print "receive_from data is %s " % data
if not data:
print "receive_from data is break ......."
break
buffer += data
except Exception, e:
print str(e)
print str(Exception)
print 'error for receive_from'
return buffer
# 对目标是远程主机的请求进行修改
def request_handler(buffer):
#执行包修改
return buffer
# 对目标是本地主机的响应进行修改
def response_handler(buffer):
#执行包修改
return buffer
def proxy_handler(client_socket, remote_host, remote_port, receive_first):
# 连接远程主机
remote_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print "remote_socket start ...... %s %d" % (remote_host, remote_port)
remote_socket.connect((remote_host, remote_port))
# 如果必要从远程主机接收数据
if receive_first:
remote_buffer = receive_from(remote_socket)
hexdump(remote_buffer)
# 发送给我们的响应处理
remote_buffer = response_handler(remote_buffer)
# 如果我们有数据传递给本地客户端，发送它
if len(remote_buffer):
print "[<==] Sending %d bytes to localhost." % len(remote_buffer)
client_socket.send(remote_buffer)
# 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
while True:
# 从本地读取数据
local_buffer = receive_from(client_socket)
print "local_buffer is %s " % local_buffer
if len(local_buffer):
print "[==>] Received %d bytes from localhost." % len(local_buffer)
hexdump(local_buffer)
# 这里可以改变我们请求的数据 过滤等功能
local_buffer = request_handler(local_buffer)
# 向远处主机发送数据
remote_socket.send(local_buffer)
print "[==>] Sent to remote."
# 接收响应的数据
remote_buffer = receive_from(remote_socket)
if len(remote_buffer):
print "[<==] Received %d bytes from remote." % len(remote_buffer)
hexdump(remote_buffer)
# 发送到响应处理函数
remote_buffer = response_handler(remote_buffer)
# 将响应发送给本地socket
client_socket.send(remote_buffer)
# 如果两边都没有数据， 关闭连接
if not len(local_buffer) or not len(remote_buffer):
client_socket.close()
remote_socket.close()
print "[*] No more data. Closing connections."
sys.exit(0)
break
def main():
if len(sys.argv[1:]) != 5:
print "Usage: ./proxy.py [localhost] [localport] [remotehost] [remoteport] [receive_first]"
print "Example: ./proxy.py 127.0.0.1 9000 10.12.132.1 9000 True"
sys.exit(0)
# 设置本地监听参数
local_host = sys.argv[1]
local_port = int(sys.argv[2])
# 设置远程目标
remote_host = sys.argv[3]
remote_port = int(sys.argv[4])
# 告诉代理在发送给远程主机之前连接和接受数据
receive_first = sys.argv[5]
if "True" in receive_first:
receive_first = True
else:
receive_first = False
# 设置好我们的监听 socket
server_loop(local_host, local_port, remote_host, remote_port, receive_first)
main()
##
##python index5.py 0.0.0.0 9999 120.25.249.52 80 True
##cd D:\python_code\httPython
0x03 TCP客户端
# coding:utf8
import socket
target_host = '127.0.0.1'
target_port = 9999
# 建立一个socket 对象
# socket.AF_INET表示IPv4地址，或者主机名
# socket.SCOK_STREAM 这将是一个TCP客户端
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# 连接客户端
client.connect((target_host, target_port))
# 发送一些数据
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
# 接收一些数据
response = client.recv(4096)
print response
0x04 总结
全篇水文，只为以后造轮子，安排！
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