Indy HTTP(s) reverse proxy - delphi

I'm trying to create a HTTP(s) proxy server that will act like this:
Browser configured to use proxy on 127.0.0.1:1080. On this port, I need to have a server (TIdTCPServer?) that will pass data coming to a client, that is connected on this same server (maybe into another port to make things easier). The client need to be connected, and not serving connection because of possible NAT restrictions.
The idea is that the client will execute the requests and send back to the server, which should send to the browser.
Browser > connect to local server > send to client connected which make the request
I thought about IdHTTPProxy, but no idea on how to pass request to a client, and client execute, gets back the data to the server / browser.
I read about TIdMappedPortTCP, but looks like this should connect into another host/port, and in my case the client can't receive connections.

Related

Rails. using a web socket like rest, but with an open connection

I have a web api that posts json to different external endpoints on certain conditions. We have a new client that wants us to open a web socket connection with them during an event, send them the data (json) when we get it via this socket, and close the socket after the event. I'm having a hard time figuring out the rails way to do this.
How do I open a web socket connection and keep it open? (basically where would the client sit/ what would the definition look like).
How do I send messages over the socket from a controller? (eg. after processing a post request send new data to this websocket)
How do I close the connection?
You can try using this gem called Faye. Here's an example for connecting and sending data: (note: I didn't test it)
# Open the connection
ws = Faye::WebSocket::Client.new('ws://www.example.com/')
# Send data to connection
ws.send(YOURJSONDATA)
# Close connection (RFC 6455)
ws.close
Notes for faye:
Using the WebSocket client
Adding headers and other options to connection
WebSocket API
RFC 6455
Hope it helps!

Creating a websocket with ngrok

I am using ngrok to tunnel to my ASP.NET core application. I am using Fleck to try and create a websocket connection between my application (server side) and an external API (client side). The problem is, the API requires a URL (ws://mysite.com/socket) that it will request a websocket connection from, however, the WebSocketServer(ip) object creates a websocket on a certain IP address and port. Can I tell the API to try and establish a connection with ws://5f1ce6fe.ngrok.io? Also, how do I find the IP address/port combination using ngrok that I will use to open the appropriate websocket on my server so that it accepts a websocket request at ws://5f1ce6fe.ngrok.io?
Thanks

Client server login

I have a server available which can be reached via an IP address and port 22. The server can only be accessed via a username and password. If I send the assignment "getinfo" to the server, it will give some text which I need.
I can access this via an SSH client, like KITTY, but how do I do this in Delphi?
I assume that the TIdTCPClient component will suffice, but I do not understand how a login can be implemented.

How socks protocol is working

Currently I need to implement socks client. According RFC, Socks protocol has two main commands: CONNECT and BIND. CONNECT is used to forward an outbound connection from socks' client to desired Server. BIND is used to forward an inbound connection from desired Server to socks' client.
My client work as follows:
Firstly It makes connection to socks Server, let us call it a "client connection".
After that it issues commands.
I have some misunderstanding with a "client connection" utilisation. Hence, I have the following questions:
A "client connection" could be used only for one CONNECTION command, is that right ? So for each desired communication I need to create a new "client connection" and after that issue command CONNECT.
For BINDing, firstly, i need to issue CONNECT and after issue command BIND. These commands must be issued in a one "client connection", am I right ?
How many inbound connections socks server could receive on BIND socket ? Only one ?
How traffic flows in case of BIND is used ? We have a "client connection" to socks server. For the "client connection" socks server has one connection to desired server and one incoming connection from desired server. Hence, socks server could receive data from two connections. How this traffic is mixed to the "client connection"?
Yes.
No. BIND is separate from CONNECT. It is for when you want to listen, so you tell the server to listen on your behalf and tell him what port you're listening on.
Pass.
There is only one connection between the client and the SOCKS server. Everything arriving from the client is sent to the 'desired server'. Everything arriving from the 'desired server' is sent to the client. There is nothing to mix. You wouldn't want the client's sends to be sent back to him, would you?

Asynchronous Socket Programming

I've created a project using socket programming. If I connect a single client to my server, the data I send from my client is successfully received by the server. But whenever I connect more than one client, only one client's data is received by the server. The other clients fail to connect. How can I make the server accept all new incoming connections, and how can I make the server receive two files from the same client?
If your code uses BeginAccept, EndAccept methods to accept new connection asynchonously, don't forget to call again BeginAccept after EndAccept call in your AcceptCallback.
Regards

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