https://crowbar.team/tags/steam-api/ Recent content in Steam-Api on crowbar Hugo en-us Sat, 01 Feb 2020 02:00:00 +0000 https://crowbar.team/posts/csgo-ip-grabber/ Sat, 01 Feb 2020 02:00:00 +0000 https://crowbar.team/posts/csgo-ip-grabber/ <h2 id="overview">Overview</h2> <p>CSGO&rsquo;s lobby architecture implements a decentralized peer-to-peer topology, where clients establish direct connections to exchange game state and synchronize player actions. This design exposes the underlying <code>ISteamNetworking</code> interface, which leaks remote peer IPv4 addresses through the <code>P2PSessionState_t</code> structure. This enables trivial IP enumeration of all players in an active lobby.</p> <h2 id="architecture-analysis">Architecture Analysis</h2> <h3 id="steam-networking-stack">Steam Networking Stack</h3> <p>CSGO leverages Valve&rsquo;s proprietary Steam networking layer built atop the Source engine. The P2P system abstracts away NAT traversal through a combination of direct connections and relay servers, exposing the following critical structures via the Source SDK:</p>