Query GNS remote IPv4 endpoint

server/native_transport/co_gns_server_endpoint.cpp

@@ -0,0 +1,34 @@
+#include "co_gns_server_bridge.h"
+
+#include <steam/steamnetworkingsockets.h>
+
+extern "C"
+{
+    int co_gns_server_remote_ipv4(
+        co_gns_server_handle handle,
+        uint32_t connection_id,
+        uint32_t* out_ipv4_host_order,
+        uint16_t* out_port)
+    {
+        if (handle == nullptr || connection_id == 0 || out_ipv4_host_order == nullptr || out_port == nullptr) {
+            return 0;
+        }
+
+        auto* networking = SteamNetworkingSockets();
+        if (networking == nullptr) {
+            return 0;
+        }
+
+        SteamNetConnectionInfo_t info{};
+        if (!networking->GetConnectionInfo(static_cast<HSteamNetConnection>(connection_id), &info)) {
+            return 0;
+        }
+        if (!info.m_addrRemote.IsIPv4()) {
+            return 0;
+        }
+
+        *out_ipv4_host_order = info.m_addrRemote.GetIPv4();
+        *out_port = info.m_addrRemote.m_port;
+        return 1;
+    }
+}