rtldg rtldg

What is Steam Datagram Relay / Steam Networking?

Resources:

Steam Networking is a bundle of APIs that do a lot of things and most notably support Steam Datagram Relay, which is provided by Valve to proxy connections to your server/SRCDS, to protect your server/SRCDS from DDOS, and provide P2P support.

Previously, if you could not port-forward your SRCDS server's ports, it would only work as a LAN server and other players wouldn't be able to join.

Resources

System V AMD64 psABI pdf https://gitlab.com/x86-psABIs/x86-64-ABI/-/jobs/artifacts/master/raw/x86-64-ABI/abi.pdf?job=build
Agner Fog's Calling conventions pdf https://www.agner.org/optimize/calling_conventions.pdf

Random Notes

Right before a call, the stack must be aligned to 16-bytes.
- (Right after a call, (rsp&8) == 8)
In the called function: A frame pointer (RBP) is often used to realign the stack to 16-bytes.
- push rbp + mov rsp, rbp

	function Encode-Url {
	param([string]$url)
	return [System.Net.WebUtility]::UrlEncode($url)
	}

	Push-Location -LiteralPath "$PSScriptRoot"
	$psd = gc "*.psd" -Raw -Encoding UTF8;
	$text_layers = (Select-String -Pattern '<photoshop:LayerText>(.*)</photoshop:LayerText>' -InputObject $psd -AllMatches \|
	Foreach {$_.matches} \|
	Foreach {$_.Groups[1].Value} \|

	// ==UserScript==
	// @name The Dles links
	// @namespace http://tampermonkey.net/
	// @version 2025-12-18
	// @description try to take over the world!
	// @author You
	// @match https://dles.aukspot.com/
	// @icon https://icons.duckduckgo.com/ip2/aukspot.com.ico
	// @grant none
	// ==/UserScript==

	From f3db078d94224f4bebd9c7a8615a277e55b92efe Mon Sep 17 00:00:00 2001
	From: rtldg <rtldg@protonmail.com>
	Date: Thu, 6 Mar 2025 08:14:39 +0000
	Subject: [PATCH] Fix 'non-const reference cannot bind to bit-field' error with
	newer clang versions

	This specifically shows up when trying to use zig 0.14.0 (llvm 19.1.7) to cross-compile to Linux.

	In file included from H:\code\srcwr\srcwrtimer/_external/alliedmodders/sourcemod/public/CDetour/detours.cpp:1:
	In file included from H:\code\srcwr\srcwrtimer/_external/alliedmodders/sourcemod/public/CDetour/detours.h:36:

	ALT+UP=target inner byobu
	ALT+DOWN=target outer byobu
	ALT+LEFT=go left one byobu "page" thing
	ALT+RIGHT=go right one byobu "page" thing
	F2=create new byobu page
	SHIFT+F2=create horizontal split on current byobu panel
	CTRL+F2=create vertical split on current byobu pane
	SHIFT+UP=go up byobu panels
	SHIFT+DOWN=go down byobu panels
	SHIFT+LEFT=go left in byobu panels

	#include <stdio.h>

	#ifdef _MSC_VER
	#define PACKED
	#pragma pack(push, 1)
	#else
	#define PACKED __attribute__((packed))
	#endif
	typedef struct PACKED thing {
	thing() : a(10), b(15) { printf("hello %d %d\n", a, b); }

	-- SPDX-License-Identifier: WTFPL
	-- Copyright 2025 rtldg <rtldg@protonmail.com>

	--[[
	basically this:
	screenshot-template="%F %P %n %{sub-text}"
	Only includes sub-text in filename if the picture includes subs.

	Things this basically does:
	- Trim screenshot filenames to remove trailing '.', '_', and (c <= ' ').

	public void OnPluginStart()
	{
	char output[0xFFFF], data[0xFFFF];
	int outputpos;
	int pointer;

	char code[] = "++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.";

	for (int i; code[i]; i++) {
	switch (code[i]) {