Thread: I am writing a (http) proxy server in windows, it doesn't work I expect?

  1. #1
    Registered User
    Join Date
    Oct 2010

    I am writing a (http) proxy server in windows, it doesn't work I expect?

    nfds = sacceptedclient > swebside ? sacceptedclient : swebside;
    	send(swebside, buf, sizeof(buf), 0);
    	ZeroMemory(buf, sizeof(buf));
    	//tv.tv_sec = 2;
    	//tv.tv_usec = 20;
    		FD_SET(sacceptedclient, &fds1);
    		FD_SET(swebside, &fds1);
    		if((j = select(nfds+1, &fds1, NULL, NULL, NULL)) == SOCKET_ERROR)
    		//if(j <= 0) break;
    		if(FD_ISSET(swebside, &fds1))
    			ZeroMemory(buf, sizeof(buf));
    			i = recv(swebside, buf, sizeof(buf), 0);
    			if(i > 0)
    			send(sacceptedclient,buf, i, 0);
    			else break;
    		if(FD_ISSET(sacceptedclient, &fds1))
    			ZeroMemory(buf, sizeof(buf));
    			i = recv(sacceptedclient, buf, sizeof(buf), 0);
    			if(i > 0)
    			send(swebside, buf, i, 0);
    			else break;
    I receive http error 400.

    What is the problm?

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    > send(swebside, buf, sizeof(buf), 0);
    Why the whole buffer?
    Why not what is just valid data?

    > ZeroMemory(buf, sizeof(buf));
    If you're doing the right thing with lengths in send and recv calls, then all of these are a waste of effort.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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