2.2.12.1 Monitor Layout PDU
The Monitor Layout PDU is used by the server to notify the client of the monitor layout in the session on the remote server.
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tpktHeader |
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mcsSDin (variable) |
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securityHeader (variable) |
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shareDataHeader (18 bytes) |
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monitorCount |
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monitorDefArray (variable) |
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tpktHeader (4 bytes): A TPKT Header, as specified in [T123] section 8.
x224Data (3 bytes): An X.224 Class 0 Data TPDU, as specified in [X224] section 13.7.
mcsSDin (variable): Variable-length PER-encoded MCS Domain PDU (DomainMCSPDU) which encapsulates an MCS Send Data Indication structure (SDin, choice 26 from DomainMCSPDU), as specified in [T125] section 11.33 (the ASN.1 structure definitions are given in [T125] section 7, parts 7 and 10). The userData field of the MCS Send Data Indication contains a Security Header, Share Data Header, monitor count, and a monitor definition array.
securityHeader (variable): Optional security header. The presence and format of the security header depends on the Encryption Level and Encryption Method selected by the server (sections 5.3.2 and 2.2.1.4.3). If the Encryption Level selected by the server is greater than ENCRYPTION_LEVEL_NONE (0) and the Encryption Method selected by the server is greater than ENCRYPTION_METHOD_NONE (0), then this field MUST contain one of the following headers:
Basic Security Header (section 2.2.8.1.1.2.1) if the Encryption Level selected by the server is ENCRYPTION_LEVEL_LOW (1).
Non-FIPS Security Header (section 2.2.8.1.1.2.2) if the Encryption Method selected by the server is ENCRYPTION_METHOD_40BIT (0x00000001), ENCRYPTION_METHOD_56BIT (0x00000008), or ENCRYPTION_METHOD_128BIT (0x00000002).
FIPS Security Header (section 2.2.8.1.1.2.3) if the Encryption Method selected by the server is ENCRYPTION_METHOD_FIPS (0x00000010).
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If the Encryption Level selected by the server is ENCRYPTION_LEVEL_NONE (0) and the Encryption Method selected by the server is ENCRYPTION_METHOD_NONE (0), then this header MUST NOT be included in the PDU.
shareDataHeader (18 bytes): A Share Data Header containing information about the packet. The type subfield of the pduType field of the Share Control Header (section 2.2.8.1.1.1.1) MUST be set to PDUTYPE_DATAPDU (7). The pduType2 field of the Share Data Header MUST be set to PDUTYPE2_MONITOR_LAYOUT_PDU (55), and the pduSource field MUST be set to zero.
monitorCount (4 bytes): A 32-bit, unsigned integer. The number of display monitor definitions in the monitorDefArray field.
monitorDefArray (variable): A variable-length array containing a series of TS_MONITOR_DEF structures (section 2.2.1.3.6.1), which describe the display monitor layout of the session on the remote server. The number of TS_MONITOR_DEF structures that follows is given by the monitorCount field.