python代理服务器非法请求

问题描述

我正在为一个任务制作一个 python 代理服务器。这是我使用 proxy.py 取得的进展。

from socket import *

import sys
import string

if len(sys.argv) <= 1:
    print('\nUsage : "Python proxyServer.py server_ip"\nServer IP : Address of the Proxy Server')
    sys.exit(2)

#create a server socket
SerSocket = socket(AF_INET,SOCK_STREAM)
print("\nSocket successfully Created")
port = 8888
host = ''
SerSocket.bind((host,port))
print("Socket is bound to port: %s" % port)

#listen for incoming connection
SerSocket.listen(5)
print("Socket is listening for incoming connections")

while True:

    #receiving data from client
    print("...Ready to Serve...")

    #establish connection with client
    CliSocket,Clientaddress = SerSocket.accept()
    print('\nRecieve a connection from: ',Clientaddress)
    #CliSocket.connect(Clientaddress)
    message = CliSocket.recv(8)
    #print(message.decode("utf-8"))

    #extract filename from the given message
    print(message.split()[1])
    file1 = message.split()[1]
    print(file1)

    filename = message.decode("utf-8")
    fileExist = "false"
    #filename = "/" + filename
    filetouse = "/" + filename.replace("/","")
    print(filetouse)

    try:
        #check whether the file exist in cache
        f = open(filetouse[1:],"r")
        outputdata = f.readlines()
        fileExist = "true"

        #proxyServer finds a cache hit and generate  response message
        CliSocket.send(bytes("HTTP/1.0 200 OK\r\n","utf-8"))
        #CliSocket.send("HTTP/1.0 200 OK\r\n")
        CliSocket.send(bytes("content-Type: text/html\r\n"))

        respond = ""
        for s in outputdata:
            respond += s
        CliSocket.send(bytes(respond))

        print('...read from cache')

    #error handling for file not found in cache
    except IOError:
        if fileExist == "false":
            #create a socket on the proxy server
            c = socket(AF_INET,SOCK_STREAM)
            hostn = filename.replace("www.","",1)
            #hostn = filename.split('/'[0].replace("www.",1))
            print(hostn)

            try:
                #connect to the socket to port 80
                c.connect((hostn,port))

                #create a temporary file on this socket 
                #and ask port 80 for the file requested by the client
                fileobj = c.makefile('r',0)
                fileobj.write("GET "+"http://" + filename + " HTTP/1.0\n\n")

                #show what request was made
                print("GET "+"http://" + filename + " HTTP/1.0")

                #read the response into buffer
                respond = c.recv(4096)
                response = ""

                while respond:
                    response += respond 
                    respond = c.recv(4096)

                    #create a new file in the cache for the requested file
                    #also send the response in the buffer to clientsocket & the corresponding file in the cache
                    if (filename[-1:] == '/'):
                        filename = filename[:-1]

                    tmp = open("./" + filename,"wb")
                    tmp.write(bytes(response))
                    tmp.close()

                    CliSocket.send(bytes(response))

            except:
                #print (str(e))
                print("..Illegal Request")

        else:
            #HTTP response message for file not found
            pass

    #close the client and server socket
    CliSocket.close()

我正在尝试运行 localhost:8888/www.google.com，但是无论何时我都会收到非法请求错误。一开始我以为这只是一个网站，但我尝试了一系列网站，所有网站都出现了同样的错误。

这是错误：

Receive a connection from:  ('127.0.0.1',49623)
b'/www'
b'/www'
/GET www
GET /www
..Illegal Request
...Ready to Serve...

我该如何解决这个问题？

解决方法

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