I've been trying to create a proxy server to analyze TCP packages sent between my computer and a game server.
Now I know that you can do this kind of stuff with Wireshark, but I want to understand the logic of it and how the connections are made.
My main question is that I don't know where to start from. I have the server IP and port from Process Explorer and have the basic socket programming knowledge in python, but as I said, I don't know what to code.
Am I supposed to write a socket that hijacks the incoming TCP connection and forward it to my localhost? but then how would my client send data to server?
As you can see, I'm a bit lost, and I would be very happy if someone could put me in a correct path (what should I research?).
Thank you in advance.
I think there is a useful tools can help you: iptables and netfilter. Using this, you can hijacks the incoming TCP connection and forward it to your localhost easily.
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I have to edit an existing VB6 application that deals with Socket requests from client endpoints. What are tools (Classes/methods) that allow one to make an SSL Socket instead of a classic socket. I found out that there is a control called WinSock, but I don't know whether it is suitable for the server's tasks or not.
Any kind of help will be appreciated.
Thanks.
I want to connect to a locally running TCP service from a web application I'm building using the Play framework and scala.
I'm not sure how to open this connection and send commands to it, should I be writing raw socket code? Also, how should I be managing the connection? Can I just open the connection once and send commands from each web request to it? What if the connection is closed or falls over?
Not sure Pay will be of much help here, most of its modules focus on HTTP communication. You should have a look at Akka-IO though.
If you telnet to the ip address 192.43.244.18 port 13, you'll get the current time.
well, if I'm not wrong, this is simply a server socket. But there's one thing strange: how's this socket always listening?
If I take a PHP page and program sockets in there, I still have to request for the page first in order to activate the server socket, but this one isn't associated with any pages, and even if a make a perl script, I still have to request for that in order to run the server socket!
My question is: how can I make such a thing - an always listening socket - on a webhost (any language will do)?
You can run the process that's listening on the socket as a daemon (Linux) or service (Windows), or just a regular program really (although that's less elegant).
A simple place to begin would be http://docs.oracle.com/javase/tutorial/networking/sockets/clientServer.html which teaches you how to make a simple serversocket in Java that listens for a connection on a specific port. The program created will have to be run at all times to be able to accept the connections.
I have installed a streaming server "Lighttpd" (light-tpd) which runs on port 81.
I have a C program that listens to http requests on port 80 using a server socket created by socket api.
I want that as soon as I get a request on the port 80 from a client I forward that to the streaming server and the remaining conversation takes place b/w the Streaming Server and client & they bypass my C program completely.
The problem is client would be expecting msgs from socket at port 80 (i.e from the socket of my C program) since it had sent request to port 80 only rather than from the Streaming server which gives service on port 81.
can anyone help me out on this issue of bypassing the socket on port 80 for replying to the client.
Solution I think: my program can be a middle man...It will forward the request to port 81 of streaming server and when it get replies from there it forwards them to the client...but bypassing would be efficient and I don't know how to do that. Please help me out.
Thanks in advance
Why put your C program in front? Lighttpd is designed to act as a frontend proxy (among other uses), so you can put lighttpd in front and use its mod_proxy_core to pass requests to your C program. You can use X-Rewrite and/or X-Sendfile to pass requests back to Lighttpd after doing some processing inside your application.
I have recently implemented a similar technique where a single program accepts a TCP connection and then 'passes' that connection to another component and plays no further part in the socket conversation. It uses the technique of passing the file descriptor of the accepted socket over a UNIX socket to the server component which effectively does an inter-process dup() of the fd.
See here and here.
This works for me as I have control of both ends of the UNIX socket on the server-side, but to work for you, you'd need:
A UNIX socket between your dispatching component and server components.
Full control of the server component.
You might need to hack away at the lighttpd source code...
Sorry, not really an proper answer...
I do know that I can't have two programs listening to the same port, but I am wondering if it is possible to fake it somehow, for an example:
My machine has two applications, one listening to port 80 and the other to port 6653.
If I get an incoming connection, let's say mysite.com:80/chat then it would be forwarded internally to the application listening on port 6653 and the data returned from that server would be forwarded back to port 80 somehow.
The reason I want to accomplish this is because there are many firewalls that seem to block connections to ports other than 80.
I have a chat server that I want to run on port 80, perhaps I could get another IP and machine for that, but it feels like too much trouble for a single chat server.
Any helpful feedback would be appreciated. Thanks!
You can probably do this with mod_rewrite if you're running Apache. That link has plenty of examples, including what you want (I think).
EDIT: I see you've updated the tags to say "asp.net". I'm guessing that you're not running Apache, then. I'm sure there is a similar tool for IIS, or you can use a proxy server that does the same thing.
There is a module called URL Rewrite that you can install on Windows Server 2008 (and R2) that is functionally the same as Mod_Rewrite. Download it here: http://www.iis.net/download/URLRewrite