Interposer 1.0.2 Release Notes
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What's Changed
FastDL: Automatic Server Discovery (Endpoint Probing)
FastDL can now discover the server address automatically without a BaseUrl in the config. When ProbeConnections: true, the interposer intercepts every DNS lookup and connection the game makes and accumulates the addresses. The first time a file download is needed, the accumulated addresses are probed in order with a HEAD request; the first one that returns HTTP 200 is used as the FastDL base URL for the rest of the session.
Probing is deferred until a download is actually required, so there is no extra network overhead on the game's normal connection path.
New config keys under FastDL:
| Key | Default | Description |
|---|---|---|
ProbeConnections | false | Enable automatic server discovery |
ProbePort | 80 | HTTP port used for probe requests |
ProbePath | / | HTTP path sent in the HEAD probe (must begin with /); a 200 response confirms FastDL is available |
ProbeTimeout | 2000 | Timeout in milliseconds for each probe (name resolution, connect, send, receive) — keep short to avoid stalling file loads when no server is present |
FilteredPorts | GameSpy range 23000–23009 | Port ranges to skip when collecting addresses. Useful to suppress server browser ports that would otherwise flood the candidate list. Set to [] to disable all filtering. |
BaseUrl and ProbeConnections are complementary: if BaseUrl is set it is used directly and probing is skipped. If BaseUrl is empty and ProbeConnections: true, the server is discovered at runtime.
Network Hooks
To support endpoint probing, the interposer now hooks ws2_32.dll and wsock32.dll (for older Winsock 1 games). The following functions are intercepted:
- ws2_32:
getaddrinfo,GetAddrInfoW,connect,WSAConnect,send,WSASend,recv,WSARecv,sendto,WSASendTo,recvfrom,WSARecvFrom - wsock32:
gethostbyname,connect,send,recv,sendto,recvfrom
Network hooks are skipped entirely when both Logging.Network and FastDL.ProbeConnections are false — no performance impact when neither feature is in use.
Games that load wsock32.dll after injection (rather than at startup) are handled via late hook installation: the interposer monitors DLL loads and patches the wsock32 exports as soon as the module appears.
Network Logging
A new Logging.Network option (default false) logs every unique host address the game resolves or connects to. Entries use the [NET CONNECT] verb and appear in the session log alongside the other subsystems.
Logging:
Network: true # log addresses the game connects to
Borderless Fullscreen: Resize Fix
Fixed window repositioning when a game resizes its window after creation. Previously, SetWindowPos calls that changed the window size could cause the window to drift off-center. The hook now re-centers the window on its monitor whenever its size changes.