Find CServerSideClientBaseGetUserIDString (Agent fallback)

Use this fallback only after ida_preprocessor_scripts/find-CServerSideClientBase_GetUserIDString.py fails. The target is the CServerSideClientBase member that returns/formats a client's user-ID string; it is not the nearby network-ID helper, HLTV/replay formatter, or a console command.

Step 0. Skip an existing output

If CServerSideClientBase_GetUserIDString.<platform>.yaml already exists as a non-empty mapping in the active artifact module directory, skip it. Never derive the artifact path from bin or write into checkout expected artifacts while analyzing.

Step 1. Locate the target in IDA

Search the current binary for exact string literals matching the user-ID fallback values:

• STEAM_ID_LAN
• STEAM_ID_PENDING
• HLTV
• REPLAY
• UNKNOWN

Enumerate code xrefs and decompile candidate functions. Prefer the function whose first argument is the CServerSideClientBase object (rcx on Windows, normally rdi on Linux) and which returns or writes the formatted user ID. The deterministic finder intentionally excludes unrelated matches such as %.3f min, for %.2f minutes, removeid: couldn't find %s, FULLMATCH:%s %s, and banid 0 %s.

Confirm the candidate's semantics: it reads the client's identity/auth state, selects a fallback such as STEAM_ID_LAN, STEAM_ID_PENDING, HLTV, REPLAY, or UNKNOWN, and returns the resulting string (or a pointer to it). Reject functions that only produce the network ID, register a command, or log a diagnostic. The old build-14167 values are orientation only; do not copy an address without checking the current binary.

Step 2. Generate and write the artifact

Rename the verified function with IDA MCP. Use /generate-signature-for-function to generate a unique signature from the current function body, then use /write-func-as-yaml with:

• func_name=CServerSideClientBase_GetUserIDString
• verified current func_addr
• func_rva relative to the current image base
• current func_size
• validated func_sig

Write only the active platform output:

• CServerSideClientBase_GetUserIDString.windows.yaml beside engine2.dll
• CServerSideClientBase_GetUserIDString.linux.yaml beside libengine2.so

The trusted analyzer performs final canonical serialization; this skill supplies semantic fields only.

Failure handling

• If no candidate combines the identity fallbacks with CServerSideClientBase receiver semantics, stop and report the ambiguity rather than guessing from reference addresses.
• Never emit a Windows result while analyzing Linux, or vice versa.
• If the output cannot be uniquely signed, retain only fields accepted by the analyzer's schema and report why the signature was omitted; do not invent a signature.