2.2.7.1.1 General Capability Set (TS_GENERAL_CAPABILITYSET)

The TS_GENERAL_CAPABILITYSET structure is used to advertise general characteristics and is based on the capability set specified in [T128] section 8.2.3. This capability is sent by both client and server.

capabilitySetType (2 bytes): A 16-bit, unsigned integer. The type of the capability set. This field MUST be set to CAPSTYPE_GENERAL (1).

lengthCapability (2 bytes): A 16-bit, unsigned integer. The length in bytes of the capability data, including the size of the capabilitySetType and lengthCapability fields.

osMajorType (2 bytes): A 16-bit, unsigned integer. The type of platform.

Value	Meaning
OSMAJORTYPE_UNSPECIFIED 0x0000	Unspecified platform
OSMAJORTYPE_WINDOWS 0x0001	Windows platform
OSMAJORTYPE_OS2 0x0002	OS/2 platform
OSMAJORTYPE_MACINTOSH 0x0003	Macintosh platform
OSMAJORTYPE_UNIX 0x0004	UNIX platform
OSMAJORTYPE_IOS 0x0005	iOS platform
OSMAJORTYPE_OSX 0x0006	OS X platform
OSMAJORTYPE_ANDROID 0x0007	Android platform
OSMAJORTYPE_CHROME_OS 0x0008	Chrome OS platform

osMinorType (2 bytes): A 16-bit, unsigned integer. The version of the platform specified in the osMajorType field.

Value	Meaning
OSMINORTYPE_UNSPECIFIED 0x0000	Unspecified version
OSMINORTYPE_WINDOWS_31X 0x0001	Windows 3.1x
OSMINORTYPE_WINDOWS_95 0x0002	Windows 95
OSMINORTYPE_WINDOWS_NT 0x0003	Windows NT
OSMINORTYPE_OS2_V21 0x0004	OS/2 2.1
OSMINORTYPE_POWER_PC 0x0005	PowerPC
OSMINORTYPE_MACINTOSH 0x0006	Macintosh
OSMINORTYPE_NATIVE_XSERVER 0x0007	Native X Server
OSMINORTYPE_PSEUDO_XSERVER 0x0008	Pseudo X Server
OSMINORTYPE_WINDOWS RT 0x0009	Windows RT

protocolVersion (2 bytes): A 16-bit, unsigned integer. The protocol version. This field MUST be set to TS_CAPS_PROTOCOLVERSION (0x0200).

pad2octetsA (2 bytes): A 16-bit, unsigned integer. Padding. Values in this field MUST be ignored.

compressionTypes (2 bytes): A 16-bit, unsigned integer. General compression types. This field MUST be set to zero.

extraFlags (2 bytes): A 16-bit, unsigned integer. General capability information.

All RDP versions, except for RDP 4.0, support the following flags.

Flag	Meaning
FASTPATH_OUTPUT_SUPPORTED 0x0001	Advertiser supports fast-path output.<24>
NO_BITMAP_COMPRESSION_HDR 0x0400	Advertiser supports excluding the 8-byte Compressed Data Header (section 2.2.9.1.1.3.1.2.3) from the Bitmap Data (section 2.2.9.1.1.3.1.2.2) structure or the Cache Bitmap (Revision 2) Secondary Drawing Order ([MS-RDPEGDI] section 2.2.2.2.1.2.3).

All RDP versions, except for RDP 4.0 and 5.0, support the following additional flags.

Flag	Meaning
LONG_CREDENTIALS_SUPPORTED 0x0004	Advertiser supports long-length credentials for the user name, password, or domain name in the Save Session Info PDU (section 2.2.10.1).<25>

All RDP versions, except for RDP 4.0, 5.0 and 5.1, support the following additional flags.

Flag	Meaning
AUTORECONNECT_SUPPORTED 0x0008	Advertiser supports auto-reconnection (section 5.5).
ENC_SALTED_CHECKSUM 0x0010	Advertiser supports salted MAC generation (section 5.3.6.1.1).

updateCapabilityFlag (2 bytes): A 16-bit, unsigned integer. Support for update capability. This field MUST be set to zero.

remoteUnshareFlag (2 bytes): A 16-bit, unsigned integer. Support for remote unsharing. This field MUST be set to zero.

compressionLevel (2 bytes): A 16-bit, unsigned integer. General compression level. This field MUST be set to zero.

refreshRectSupport (1 byte): An 8-bit, unsigned integer. Server-only flag that indicates whether the Refresh Rect PDU (section 2.2.11.2) is supported.

Value	Meaning
FALSE 0x00	Server does not support Refresh Rect PDU.
TRUE 0x01	Server supports Refresh Rect PDU.

suppressOutputSupport (1 byte): An 8-bit, unsigned integer. Server-only flag that indicates whether the Suppress Output PDU (section 2.2.11.3) is supported.

Value	Meaning
FALSE 0x00	Server does not support Suppress Output PDU.
TRUE 0x01	Server supports Suppress Output PDU.