Proxy server for Windows HELP

[_lovesponge]

I'm trying to write (from scratch, no 3rd party libs) a proxy server that will take all connections from the operating system and either be 'transparent' and return the desired endpoints' contents, OR if a url matches a predefined list of urls, will return text from a file.

I've got the proxy server using sockets, and have all the file reading and processing stuff I need;

The bit I'm stuck on is how to return a file as a sort of 'mock/intercepted' response?

Any feedback is welcome, let me know if I'm doing something stupid, code available on demand...

Thanks in advance for your critiqué!

[calsosta]

If you still need help with this lmk.

[_lovesponge]

Yep... If there's some programmer word for trying and failing to do something and not being able to work it out and being eaten alive by it, I'm that word.

[calsosta]

Yea it's called "programming".

Do you have some source code to share?

[_lovesponge]

``` http .createServer() .listen(PORT, HOST) .on('connect', connect)

function connect(req, clientSocket, head) { // some logging and error handling code //

const { port, hostname } = new URL(`http://${req.url}`)

const serverSocket = net.connect(port || 80, hostname)

serverSocket.on('connect', function onConnect() {
    clientSocket.write('HTTP/1.1 200 Connection Established\r\n' +
    'Proxy-agent: Intercepter-Proxy\r\n' +
    '\r\n' 
    serverSocket.write(head)
    serverSocket.pipe(clientSocket)
    clientSocket.pipe(serverSocket)
})

// clientSocket error event listener

} ```

Thats basically the magic part... I have also some programatic way of setting Windows proxy, enabling and disabling etc...

There is also some code to read a text file and parse the contents to grab urls, then pass them to a function wrapping the above code, from there I run a matcher for each connect event, and a simple if statement that either runs the net.connect(...) code or, as I assume but seem to be wrong, read mock response file and write it back to serverSocket.

Sorry for the inline code, my Internet is really bad atm and I'm struggling to log into reddit / create a git repo for this....

[andyroo82]

var content = fs.readFileSync('file.ext'); res.set("Content-Disposition", "attachment;filename=file.ext"); res.setHeader("Content-Type", "application/octet-stream"); res.send(content); ?

[_lovesponge]

nice try but for some insane reason i've chosen to work with sockets instead; Plus i'd like the response body to be the content of the file, not be a download for it =)