find-CCSPlayerController_InventoryUpdateThink

Find CCSPlayerController_InventoryUpdateThink

Locate CCSPlayerController_InventoryUpdateThink (the think function wrapper) in CS2 server.dll or server.so using IDA Pro MCP tools.

Background

Think functions in Source 2 are registered through a schema system. The wrapper function pointer is stored in a schema structure, not directly referenced by the string. This requires:

1. Finding the string
2. Locating the schema initialization function
3. Reading the structure to find the wrapper function pointer

Method

1. Search for the think function name string

mcp__ida-pro-mcp__find_regex pattern="InventoryUpdateThink"

2. Get cross-references to the string

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

3. Decompile the referencing function (schema init)

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

Look for the pattern:

qword_XXXXXX = sub_1F007F0("CCSPlayerController", "InventoryUpdateThink");

Note: sub_1F007F0 is a string concatenation function, NOT the actual think function.

4. Find the wrapper function pointer in schema structure

The schema structure stores the wrapper function pointer at a fixed offset from the name string pointer. Read bytes around the name storage location:

mcp__ida-pro-mcp__py_eval code="""
import ida_bytes

# Address where the name string pointer is stored (qword_XXXXXX from step 3)
name_storage_addr = <name_storage_addr>

# Read 128 bytes starting from offset -0x38 to find the wrapper pointer
# The wrapper pointer is typically at offset +0x28 from the name storage
raw_bytes = ida_bytes.get_bytes(name_storage_addr - 0x38, 128)

# Look for function pointers (addresses in .text segment range)
for i in range(0, len(raw_bytes) - 7, 8):
    ptr = int.from_bytes(raw_bytes[i:i+8], 'little')
    if 0x900000 < ptr < 0x2100000:  # Typical .text range for server.so
        print(f"Potential function pointer at offset {hex(i - 0x38)}: {hex(ptr)}")
"""

5. Verify and decompile the wrapper function

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

The wrapper should look like:

const char *__fastcall sub_XXXXXX(__int64 a1)
{
  return InventoryUpdateThink(*(_QWORD *)(a1 + 2744));
}

Where:

• a1 is CCSPlayerController*
• Offset 2744 (0xAB8) retrieves a member pointer
• Calls the real InventoryUpdateThink function

6. Rename the wrapper function

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

7. Generate unique signature

ALWAYS Use SKILL /generate-signature-for-function to generate a robust and unique signature.

8. Write IDA analysis output as YAML

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

Required parameters:

• func_name: CCSPlayerController_InventoryUpdateThink
• func_addr: The wrapper function address from step 5
• func_sig: The validated signature from step 7

Schema Structure Pattern

The CCSPlayerController schema registers multiple think functions:

Function Characteristics

• Wrapper Size: ~12 bytes (very small thunk function)
• Pattern: mov rdi, [rdi+offset]; jmp RealFunction
• Member Offset: 0xAB8 (2744 decimal) - may change between versions

Assembly Pattern

48 8B BF B8 0A 00 00    mov  rdi, [rdi+0xAB8]   ; Get member pointer
E9 XX XX XX XX          jmp  InventoryUpdateThink ; Tail call

Output YAML Format

The output YAML filename depends on the platform:

• server.dll → CCSPlayerController_InventoryUpdateThink.windows.yaml
• server.so / libserver.so → CCSPlayerController_InventoryUpdateThink.linux.yaml

func_va: 0x132C520        # Virtual address - changes with game updates
func_rva: 0x132C520       # Relative virtual address (VA - image base)
func_size: 0xC            # Function size in bytes (typically 12 for wrapper)
func_sig: 48 8B BF B8 0A 00 00 E9  # Unique byte signature

Notes

• This is NOT a virtual function, so no vtable information is needed
• The wrapper is a simple thunk that retrieves a member and tail-calls the real function
• The signature includes the member offset which may change if CCSPlayerController layout changes