CIFS Server Capability Encoding
The first client request to a server is a SMB_COM_NEGOTIATE command that queries the server capabilities. Server capabilities include string support, large file support, and CIFS commands supported.
| Value | Description |
|---|---|
| 0x0001 | CAP_RAW_MODE The server supports SMB_COM_READ_RAW and SMB_COM_WRITE_RAW. |
| 0x0002 | CAP_MPX_MODE The server supports SMB_COM_READ_MPX and SMB_COM_WRITE_MPX. |
| 0x0004 | CAP_UNICODE The server supports Unicode strings. |
| 0x0008 | CAP_LARGE_FILES The server supports large files with 64-bit offsets. |
| 0x0010 | CAP_NT_SMBS The server supports SMB commands particular to the NTLM 0.12 dialect of CIFS. |
| 0x0020 | CAP_RPC_REMOTE_APIS The sever supports remote API requests using RPC. |
| 0x0040 | CAP_STATUS32 The server can respond with 32-bit status codes in Status.Status. |
| 0x0080 | CAP_LEVEL_II_OPLOCKS The server supports Level II oplocks. |
| 0x0100 | CAP_LOCK_AND_READ The server supports the SMB_COM_LOCK_AND_READ SMB command. |
| 0x0200 | CAP_NT_FIND |
| 0x1000 | CAP_DFS This server is DFS- aware. |
| 0x2000 | CAP_INFOLEVEL_PASSTHRU The server supports Windows NT information level requests passing through. |
| 0x4000 | CAP_LARGE_READX The server supports large read operations. |
| 0x8000 | CAP_LARGE_WRITEX The server supports large write operations. |
| 0x02000000 | CAP_RESERVED Reserved for future use. |
| 0x20000000 | CAP_BULK_TRANSFER The server supports SMB_BULK_READ and SMB_BULK_WRITE. |
| 0x40000000 | CAP_COMPRESSED_DATA The server supports compressed data transfer. This capability must be associated with BULK_TRANSFER. |
| 0x80000000 | CAP_EXTENDED_SECURITY The server supports extended security exchange. |