proxy server problem c++
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Thread: proxy server problem c++

  1. #1
    Join Date
    Feb 2011
    Posts
    1

    proxy server problem c++

    I'm trying to build a proxy server using socks5 tcp/ip. I'm having problems when sendind packets to the client,i get the following errors when trying to connect to google.com. For client i use Proxifier:
    Code:
    [25:23] Starting: Test 1: Connection to the Proxy Server
    [25:23] IP Address: 127.0.0.1
    [25:23] Connection established
    [25:23] Test passed.
    [25:23] Starting: Test 2: Connection through the Proxy Server
    [25:23] Authentication was successful.
    [25:24] Warning : the proxy server has returned an unexpected answer (0xFFFFFF84).
    [25:24] Connection to www.google.com:80 established through the proxy server.
    [25:24] Error : the reply that was recieved from the target host does not look like a usual Web Server reply.
    	Please make sure that the target host is a Web Server.
    	The error may also indicate that the proxy server is not operating properly.
    	Target host reply = www.google.c
    [25:24] Test failed.
    [25:24] Testing Finished.
    And this is my code where i receive and send packets:
    Code:
    void HandleConnection()
    	{
    		cout << "You are connected !!!" << endl;
    		char temp[30];
    		Recv(temp, sizeof(temp));
    		// Client sends 5,1,0 (version,nr of methods, the method(0 = no auth))
    		if(temp[0] == 5) // test for version
    		{
    			char* reply = new char[2];
    			reply[0] = 5; // version
    			reply[1] = 0; // method choosed (no auth required)
    			Send(reply, sizeof(reply)); // i send 5,0 (version,method choosed) i get warning that i send an unexpected answer
    			delete [] reply;
    			memset(temp, '\0', sizeof(temp));
    
    			Recv(temp, sizeof(temp));
    			// i receive 5,0,0,3,14,www.google.com,80 (version,command, reserved,type of address, dest adress, dest port)
    			int version = static_cast<int>(temp[0]);
    			int connectionType = static_cast<int>(temp[1]);
    			int adrressType = static_cast<int>(temp[3]);
    			int domainLen = static_cast<int>(temp[4]);
    			char* destinationAdrress = static_cast<char*>(&temp[5]);
    			int port1 = static_cast<int>(temp[19]);
    			int port2 = static_cast<int>(temp[20]);
    			int packetSize = sizeof(temp);
    			cout << "Size of packet: " << packetSize << endl;
    			cout << "Version: " << version << endl;
    			cout << "Conn type: " << connectionType << endl;
    			cout << "Adrr type: " << adrressType << endl;
    			cout << "Domain lenght: " << domainLen << endl;
    			cout << "Destination adrress: " << destinationAdrress << endl;
    			cout << "Destination port: " << port2 << endl;
    			if(version == 5) // test for version
    			{
    				char reply[21];
    				reply[0] = 5; // version
    
    				reply[1] = 0; // succed
    				reply[2] = 0; // reserved
    				reply[3] = 3; // its a domain
    				reply[4] = domainLen;; // lenght of domain
    				for(int j = 0; j < domainLen; ++j)
    				{
    					reply[j + 5] = destinationAdrress[j];
    				}
    				reply[5 + domainLen] = htons(port1);
    				reply[6 + domainLen] = htons(port2);
    				Send(reply, sizeof(reply));
    
    				Connect();
    			}
    		}
    
    
    	}
    I hope i find someone who can help me,i'm strugling for days,with no answer.Thanks in advanced.

  2. #2
    Join Date
    Nov 2002
    Location
    California
    Posts
    4,553

    Re: proxy server problem c++

    The variable named "reply" is a char pointer, and its size is therefore 4 bytes.

    Thus, all of your calls to "Send(reply, sizeof(reply))" are wrong, since they always send 4 bytes.

    Mike

    PS: Your call to memset on "temp" is also wrong, for the same reason.

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