find-CBaseEntity_IsPlayerPawn

Find CBaseEntity_IsPlayerPawn

Locate CBaseEntity_IsPlayerPawn in CS2 server.dll or server.so using IDA Pro MCP tools.

Method

1. Search for Reference String

Search for the string "Ignoring speaking bot %s at round end":

mcp__ida-pro-mcp__find_regex pattern="Ignoring speaking bot.*at round end"

Note the string address.

2. Find Cross-Reference and Containing Function

Get xrefs to the string address:

mcp__ida-pro-mcp__xrefs_to addrs="<string_address>"

This will lead to function CCSGameRules::Think. rename it to CCSGameRules_Think

mcp__ida-pro-mcp__rename batch={"func": [{"addr": "<function_addr>", "name": "CCSGameRules_Think"}]}

3. Decompile CCSGameRules_Think and look for certain code pattern

Decompile it and look for this code pattern:

v81 = (const char *)(*(__int64 (__fastcall **)(_QWORD))(**(_QWORD **)(v78 + 24) + 1128LL))(*(_QWORD *)(v78 + 24));
Msg("Ignoring speaking bot %s at round end\n", v81);
...
sub_XXXXXXX((unsigned __int16 *)&v123);  // <-- This is the player iterator function

Note the address of sub_XXXXXXX (the function called after the Msg).

4. Decompile Player Iterator and Extract VTable Offset

Decompile the player iterator function:

mcp__ida-pro-mcp__decompile addr="<sub_XXXXXXX_address>"

Look for this code pattern:

if ( (*(unsigned __int8 (__fastcall **)(__int64))(*(_QWORD *)v3 + 1344LL))(v3)  // <-- 1344 is IsPlayerPawn vtable offset
    && (*(unsigned __int8 (__fastcall **)(__int64))(*(_QWORD *)v4 + 3344LL))(v4)
    && (*(unsigned __int8 (__fastcall **)(__int64))(*(_QWORD *)v4 + 3208LL))(v4) )
{
    if ( *(_BYTE *)(v4 + 6832) ? *(_QWORD *)(v4 + 6824) : 0LL )
      break;
}

Extract the first vtable offset from this pattern (e.g., 1344). This is the CBaseEntity::IsPlayerPawn vtable offset.

Calculate:

• VTable Offset: The value from the pattern (e.g., 1344 = 0x540)
• VTable Index: offset / 8 (e.g., 1344 / 8 = 168)

5. Write Analysis Results as YAML

ALWAYS Use SKILL /write-vfunc-as-yaml to write the analysis results.

Required parameters:

• func_name: CBaseEntity_IsPlayerPawn
• func_addr: Leave empty, because we don't need it
• func_sig: Leave empty, because we don't need it

VTable parameters:

• vtable_name: CBaseEntity
• vfunc_index: The vtable index from step 4 (e.g., 168)
• vfunc_offset: vfunc_index * 8 (e.g., 1344)

VTable Information

• VTable Name: CBaseEntity::vftable'`
• VTable Mangled Name (Windows): ??_7CBaseEntity@@6B@
• VTable Mangled Name (Linux): _ZTV11CBaseEntity
• VTable Index: 168 - This can change when game updates.
• VTable Offset: 0x540 (168 * 8 = 1344) - This can change when game updates.

• Note that for server.so, the first 16 bytes of "vftable" are for RTTI. The real vftable = _ZTV11CBaseEntity + 0x10.

Output YAML Format

The output YAML filename depends on the platform:

• server.dll → CBaseEntity_IsPlayerPawn.windows.yaml
• server.so → CBaseEntity_IsPlayerPawn.linux.yaml

vtable_name: CBaseEntity
vfunc_index: 168
vfunc_offset: 1344

Notes

• This is a simple virtual function that just return either true or false.
• There is no need to make a signature for it.