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//--------------------------------------------------------------------
// Copyright (c)1998 Microsoft Corporation, All Rights Reserved.
//
// scep.h
//
// Constants and Types for the Simple Command Execution Protocol
// (SCEP). This is the transport protocol for IrTran-P V1.0.
//
// NOTE: That IrTran-P is a big-endian protocol when on the net.
//
// NOTE: That the protocol data structures below assume that the
// compiler generates structures with natural alignment by
// field type.
//
// Author:
//
// Edward Reus (edwardr) 02-05-98 Initial coding.
//
//--------------------------------------------------------------------
#ifndef _SCEP_H_
#define _SCEP_H_
#ifndef _BFTP_H_
#include "bftp.h"
#endif
//--------------------------------------------------------------------
// Constants:
//--------------------------------------------------------------------
#define LITTLE_ENDIAN
#define PROTOCOL_VERSION 0x01
#define NEGOTIATION_VERSION 0x11 // SCEP_NEGOTIATION revision.
#define INF_VERSION 0x10 // Information Struct version.
#define USE_LENGTH2 0xff
// These PDU sizes are the default and negotiated sizes:
#define PDU_SIZE_1 512
#define PDU_SIZE_2 1024
#define PDU_SIZE_3 2048
#define PDU_SIZE_4 4096
#define MAX_PDU_SIZE PDU_SIZE_4
#define DEFAULT_PDU_SIZE MAX_PDU_SIZE
// These sizes are used to check if we have a complete PDU:
#define MIN_PDU_SIZE_CONNECT 28
#define MAX_PDU_SIZE_CONNECT 256
#define MIN_PDU_SIZE_CONNECT_RESP 24
#define MAX_PDU_SIZE_CONNECT_RESP 255
#define MIN_PDU_SIZE_DATA 8
#define MIN_PDU_SIZE_DISCONNECT 6
// These are the sizes of the SCEP headers:
#define SCEP_HEADER_SIZE 2
#define SCEP_REQ_HEADER_SHORT_SIZE 34
#define COMMAND_HEADER_SIZE 28
#define FILE_NAME_SIZE 12 // 8.3
// These are the attribute strings that go in the negotiation part
// of connect request and response PDUs:
#define CONNECT_PDU_ATTRIBUTES "fr:3\r\nid:Microsoft IrTran-P v1.0\r\n"
#define RESPONSE_PDU_ATTRIBUTES "fr:4\r\nid:Microsoft IrTran-P v1.0\r\n"
// Message Types (field: MsgType):
#define MSG_TYPE_CONNECT_REQ 0x10 // Connection request.
#define MSG_TYPE_CONNECT_RESP 0x11 // Connection confirmation.
#define MSG_TYPE_DATA 0x20 // Data PDU.
#define MSG_TYPE_DISCONNECT 0x30 // Disconnection.
// Information Types (field: InfType):
#define INF_TYPE_VERSION 0x00 // Connection establishment.
#define INF_TYPE_NEGOTIATION 0x01 // Connection establish or accept.
#define INF_TYPE_USER_DATA 0x03 // Only if MsgType is MSG_TYPE_DATA.
#define INF_TYPE_EXTEND 0x10 // Connection establishment.
#define INF_TYPE_REASON 0x20 // Only for disconnect.
// Command Header: Pdu Types (top two bits in PduType):
#define PDU_TYPE_REQUEST 0x00 // b:00000000
#define PDU_TYPE_REPLY_ACK 0x40 // b:01000000
#define PDU_TYPE_REPLY_NACK 0x80 // b:10000000
#define PDU_TYPE_ABORT 0xc0 // b:11000000
#define PDU_TYPE_MASK 0xc0 // b:11000000
#define PDU_TYPE_RESERVED 0x3f // b:00111111
// The machine ID is in the Connect PDU (SCEP_NEGOTIATION), it
// is in EUI-64 format:
#define MACHINE_ID_SIZE 8
// Machine PIDs: In the command header, the default source and destination
// program Ids are unsigned shorts with value 8. Some machines will have
// a PID other than this (see the first command header sent to us):
#define DEFAULT_PID 8
// CFlag meanings:
//
// There are two cases, one where a device/machine can only issue commands,
// the other when a device can both issue and execute commands.
//
#define CFLAG_ISSUE_ONLY 0x00
#define CFLAG_ISSUE_OR_EXECUTE 0x04
// DFlag Meanings:
//
// DFlag give information about the data and fragmentation (why did they
// put the reject in here?).
//
#define DFLAG_SINGLE_PDU 0xc1
#define DFLAG_FIRST_FRAGMENT 0x41
#define DFLAG_FRAGMENT 0x01
#define DFLAG_LAST_FRAGMENT 0x81
#define DFLAG_INTERRUPT 0xc2
#define DFLAG_CONNECT_REJECT 0xc3
// Reason Codes:
//
// Currently for V1.0 all reason codes are 2-byte numbers:
#define REASON_CODE_UNSPECIFIED 0x0000
#define REASON_CODE_USER_DISCONNECT 0x0001
#define REASON_CODE_PROVIDER_DISCONNECT 0x0002
// Connection States:
#define STATE_CLOSED 0
#define STATE_CONNECTING 1
#define STATE_CONNECTED 2
// Put Response Protocol Error Codes (sent back to the camera):
#define ERROR_PUT_UNDEFINED_ERROR 0x0000
#define ERROR_PUT_ILLEGAL_DATA 0x0001
#define ERROR_PUT_UNSUPPORTED_PID 0x0002
#define ERROR_PUT_ILLEGAL_ATTRIBUTE 0x0010
#define ERROR_PUT_UNSUPPORTED_CMD 0x0011
#define ERROR_PUT_FILE_SYSTEM_FULL 0x0020
#define ERROR_PUT_NO_FILE_OR_DIR 0x0021
#define ERROR_PUT_LOW_BATTERY 0x0030
#define ERROR_PUT_ABORT_EXECUTION 0x0031
#define ERROR_PUT_NO_ERROR 0xffff
//--------------------------------------------------------------------
// SCEP Protocol Headers:
//--------------------------------------------------------------------
// Turn off warning for zero-sized array...
#pragma warning(disable:4200)
#pragma pack(1)
typedef struct _SCEP_HEADER { UCHAR Null; // Always zero.
UCHAR MsgType; // See MSG_TYPE_* above.
UCHAR Rest[]; // Dependent on the MsgType...
} SCEP_HEADER;
typedef struct _SCEP_VERSION { UCHAR InfType; // Always INF_TYPE_VERSION (0x00).
UCHAR Version; // Currently 0x01 (Version = 1).
} SCEP_VERSION;
typedef struct _SCEP_NEGOTIATION { UCHAR InfType; // Always INF_TYPE_NEGOTATION (0x01).
UCHAR Length; // Length (bytes) from InfVersion to
// the end of the Negotiation information.
// This will be from 0 to 228.
UCHAR InfVersion; // Version of InfType = INF_VERSION.
UCHAR CFlag; //
UCHAR SecondaryMachineId[8]; //
UCHAR PrimaryMachineId[8]; //
UCHAR Negotiation[]; //
} SCEP_NEGOTIATION;
typedef struct _SCEP_DISCONNECT { UCHAR InfType; // Always INF_TYPE_REASON (0x20).
UCHAR Length1; // For V1.0 this should be 2.
USHORT ReasonCode; // See the REASON_CODE_xxx
} SCEP_DISCONNECT;
typedef struct _SCEP_EXTEND { UCHAR InfType; // Always INF_TYPE_EXTEND (0x10).
UCHAR Length; // Always 2 (bytes).
UCHAR Parameter1; UCHAR Parameter2; } SCEP_EXTEND;
typedef struct _COMMAND_HEADER { UCHAR Marker58h; // Always 0x58 (See: 3.2.2.1.3 of Protocol).
UCHAR PduType; // One of: PDU_TYPE_xxxx.
ULONG Length4; UCHAR DestMachineId[MACHINE_ID_SIZE]; UCHAR SrcMachineId[MACHINE_ID_SIZE]; USHORT DestPid; USHORT SrcPid; USHORT CommandId; } COMMAND_HEADER;
typedef struct _SCEP_REQ_HEADER_SHORT { UCHAR InfType; // Always INF_TYPE_USER_DATA (0x03).
UCHAR Length1; UCHAR InfVersion; // Version of InfType = INF_VERSION.
UCHAR DFlag; USHORT Length3; UCHAR CommandHeader[sizeof(COMMAND_HEADER)]; UCHAR UserData[]; } SCEP_REQ_HEADER_SHORT;
typedef struct _SCEP_REQ_HEADER_LONG { UCHAR InfType; // Always INF_TYPE_USER_DATA (0x03).
UCHAR Length1; USHORT Length2; // Only present if Length1 == 0xff.
UCHAR InfVersion; // Version of InfType = INF_VERSION.
UCHAR DFlag; USHORT Length3; UCHAR CommandHeader[sizeof(COMMAND_HEADER)]; UCHAR UserData[]; } SCEP_REQ_HEADER_LONG;
typedef struct _SCEP_REQ_HEADER_SHORT_FRAG { UCHAR Inftype; // Always INF_TYPE_USER_DATA (0x03).
UCHAR Length1; UCHAR InfVersion; // Version of InfType = INF_VERSION.
UCHAR DFlag; USHORT Length3; DWORD SequenceNo; // Fragment number.
DWORD RestNo; // Number of fragments left for this PDU.
UCHAR CommandHeader[sizeof(COMMAND_HEADER)]; UCHAR UserData[]; } SCEP_REQ_HEADER_SHORT_FRAG;
typedef struct _SCEP_REQ_HEADER_LONG_FRAG { UCHAR InfType; // Always INF_TYPE_USER_DATA (0x03).
UCHAR Length1; USHORT Length2; // Only present if Length1 == 0xff.
UCHAR InfVersion; // Version of InfType = INF_VERSION.
UCHAR DFlag; USHORT Length3; DWORD SequenceNo; // Fragment number.
DWORD RestNo; // Number of fragments left for this PDU.
UCHAR CommandHeader[sizeof(COMMAND_HEADER)]; UCHAR UserData[]; } SCEP_REQ_HEADER_LONG_FRAG;
#pragma pack()
#pragma warning(default:4200)
//--------------------------------------------------------------------
// SCEP API Structures:
//--------------------------------------------------------------------
class CSCEP_CONNECTION{public: CSCEP_CONNECTION(); ~CSCEP_CONNECTION();
void *operator new( IN size_t Size );
void operator delete( IN void *pObj, IN size_t Size );
// Assemble the next PDU as data comes in:
DWORD AssemblePdu( IN void *pInputData, IN DWORD dwInputDataSize, OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
// Parse the PDU returned from AssemblePdu():
DWORD ParsePdu( IN SCEP_HEADER *pPdu, IN DWORD dwPduSize, OUT COMMAND_HEADER **ppCommand, OUT UCHAR **ppUserData, OUT DWORD *pdwUserDataSize );
DWORD SetScepLength( IN SCEP_HEADER *pPdu, IN DWORD dwTotalPduSize );
// Construct SCEP connection/control PDUs:
DWORD BuildConnectPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD BuildConnectRespPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD BuildConnectNackPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD BuildAbortPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD BuildStopPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD BuildDisconnectPdu( IN USHORT ReasonCode, OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
// Build bFTP request (client-side) PDUs:
DWORD BuildBftpWht0RinfPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize, OUT SCEP_REQ_HEADER_LONG **ppCommand, OUT COMMAND_HEADER **ppCommandHeader );
DWORD BuildBftpPutPdu( IN DWORD dwUpfFileSize, IN CHAR *pszUpfFile, IN OUT DWORD *pdwFragNo, OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize, OUT SCEP_REQ_HEADER_LONG_FRAG **ppCommand );
// Build bFTP response PDUs:
DWORD BuildBftpRespPdu( IN DWORD dwPduSize, OUT SCEP_HEADER **ppPdu, OUT SCEP_REQ_HEADER_SHORT **ppCommand, OUT COMMAND_HEADER **ppCommandHeader );
DWORD BuildWht0RespPdu( IN DWORD dwWht0Type, OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD BuildPutRespPdu( IN DWORD dwPduAckOrNack, IN USHORT usErrorCode, OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
// Parse the bFTP in a SCEP command request PDU:
DWORD ParseBftp( IN UCHAR *pvBftpData, IN DWORD dwDataSize, IN BOOL fSaveAsUPF, OUT DWORD *pdwBftpOp, OUT UCHAR **ppPutData, OUT DWORD *pdwPutDataSize );
// Parse and save the create date/time that was specified as a
// bFTP option:
DWORD SaveBftpCreateDate( IN UCHAR *pDate, IN DWORD dwLength );
// Parse the UPF file header to find the image JPEG file:
DWORD ParseUpfHeaders( IN UCHAR *pPutData, IN DWORD dwPutDataSize, OUT DWORD *pdwJpegOffset, OUT DWORD *pdwJpegSize );
// Used when a SCEP command PDU is received:
BOOL IsFragmented(); DWORD GetSequenceNo(); DWORD GetRestNo(); DWORD GetCommandId(); CHAR *GetFileName(); UCHAR GetDFlag(); FILETIME *GetCreateTime();
protected:
DWORD CheckPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD CheckConnectPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD CheckAckPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD CheckNackPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD CheckConnectRespPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD CheckDataPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD CheckDisconnectPdu( OUT SCEP_HEADER **ppPdu, OUT DWORD *pdwPduSize );
DWORD ParseConnectPdu( IN SCEP_HEADER *pPdu, IN DWORD dwPduSize );
DWORD ParseConnectRespPdu( IN SCEP_HEADER *pPdu, IN DWORD dwPduSize );
DWORD ParseDataPdu( IN SCEP_HEADER *pPdu, IN DWORD dwPduSize, OUT COMMAND_HEADER **ppCommand, OUT UCHAR **ppUserData, OUT DWORD *pdwUserDataSize );
DWORD ParseDisconnectPdu( IN SCEP_HEADER *pPdu, IN DWORD dwPduSize );
DWORD ParseNegotiation( IN UCHAR *pNegotiation, IN DWORD dwNegotiationSize );
UCHAR *ParseAttribute( IN UCHAR *pAttributes, IN OUT DWORD *pdwAttributeSize, OUT DWORD *pdwStatus );
DWORD ParseSingleLongPdu( IN SCEP_HEADER *pPdu, IN DWORD dwPduSize );
BFTP_ATTRIBUTE *ParseBftpAttributeName( IN BFTP_ATTRIBUTE *pAttr, IN OUT DWORD *pdwSize, OUT DWORD *pdwWhichAttr );
DWORD m_dwConnectionState; DWORD m_dwPduSendSize; DWORD m_dwPduReceiveSize; UCHAR m_CFlag; UCHAR *m_pPrimaryMachineId; UCHAR *m_pSecondaryMachineId; USHORT m_DestPid; // My PID (Camera point of view).
USHORT m_SrcPid; // Camera's PID (Camera point of view).
UCHAR *m_pszProductId; UCHAR *m_pszUserName; UCHAR *m_pszPassword;
// Used during PDU assembley process.
UCHAR *m_pAssembleBuffer; DWORD m_dwAssembleBufferSize; DWORD m_dwMaxAssembleBufferSize; BOOL m_fDidByteSwap;
// Used to manage the current SCEP command PDU.
UCHAR m_Fragmented; UCHAR m_DFlag; DWORD m_dwSequenceNo; DWORD m_dwRestNo; DWORD m_dwCommandId; COMMAND_HEADER *m_pCommandHeader;
//
// NOTE: The m_pszFileName is the file name that the camera sent us,
// while pszSaveFileName is the file name will will actually
// save the file under (different extension). m_pszLongFileName
// is the optional BFTP file name (not currently used), it
// is not usually present in the BFTP.
//
CHAR *m_pszFileName; CHAR *m_pszSaveFileName; CHAR *m_pszLongFileName;
FILETIME m_CreateTime;};
//--------------------------------------------------------------------
// Inline Functions:
//--------------------------------------------------------------------
inline BOOL CSCEP_CONNECTION::IsFragmented() { return m_Fragmented; }
inline DWORD CSCEP_CONNECTION::GetSequenceNo() { return m_dwSequenceNo; }
inline DWORD CSCEP_CONNECTION::GetRestNo() { return m_dwRestNo; }
inline DWORD CSCEP_CONNECTION::GetCommandId() { return m_dwCommandId; }
inline CHAR *CSCEP_CONNECTION::GetFileName() { return m_pszSaveFileName; }
inline UCHAR CSCEP_CONNECTION::GetDFlag() { return m_DFlag; }
inline FILETIME *CSCEP_CONNECTION::GetCreateTime() { if ( (m_CreateTime.dwLowDateTime) || (m_CreateTime.dwHighDateTime) ) { return &m_CreateTime; } else { return 0; } }
//--------------------------------------------------------------------
// Utility Functions/Macros:
//--------------------------------------------------------------------
#define ByteSwapShort(Value) \
( (((Value) & 0x00FF) << 8) \ | (((Value) & 0xFF00) >> 8))
#define ByteSwapLong(Value) \
( (((Value) & 0xFF000000) >> 24) \ | (((Value) & 0x00FF0000) >> 8) \ | (((Value) & 0x0000FF00) << 8) \ | (((Value) & 0x000000FF) << 24))
extern void ByteSwapReqHeaderShort( SCEP_REQ_HEADER_SHORT *pSingleShort );
extern void ByteSwapReqHeaderLong( SCEP_REQ_HEADER_LONG *pSingleLong );
extern void ByteSwapCommandHeader( COMMAND_HEADER *pCommandHeader );
//--------------------------------------------------------------------
// Memory management functions:
//--------------------------------------------------------------------
DWORD InitializeMemory();
DWORD UninitializeMemory();
void *AllocateMemory( DWORD dwBytes ); DWORD FreeMemory( void *pvMemory );
SCEP_HEADER *NewPdu( DWORD dwPduSize = MAX_PDU_SIZE );
void DeletePdu( SCEP_HEADER *pPdu );
#if FALSE
//--------------------------------------------------------------------
SCEP Connect PDU ----------------
Connection request PDU. This is a SCEP_HEADER with Rest[] filled with three Inf Records, a SCEP_VERSION followed by a SCEP_NEGOTIATION followed by a SCEP_EXTEND. The Connect PDU must be less than or equal to 256 bytes in length.
SCEP_HEADER 2 bytes. Rest[]: SCEP_VERSION 2 bytes. SCEP_NEGOTIATION 20 - 228 bytes. SCEP_EXTEND 4 bytes. -------- 28 - 256 bytes.
- If either the SecondaryMachineId[] or PrimariyMachineId is unused, then they are set to 00,00,00,00,00,00,00,00. - If a machine gets a Connect PDU but can't execute commands (CFlag = CFLAG_ISSUE_ONLY), then it needs to respond with a NACK PDU. - The negotiation information is a simple text based command language.
SCEP Connection ACK PDU -----------------------
Connection acceptance PDU. This is a SCEP_HEADER with Rest[] filled with two Inf Records, a SCEP_VERSION followed by a SCEP_NEGOTIATION.
SCEP_HEADER 2 bytes. SCEP_VERSION 2 bytes. Rest[]: SCEP_NEGOTIATION 20-251 bytes. ------ 24-255 bytes.
- Note that the size of the ACK PDU is limited by the fact that the Length field is a single byte and that the ACK PDU can not be fragmented. Normally these PDUs will never be this long.
SCEP Connection NACK PDU ------------------------
Connection rejected PDU. This one can have either of two different formats.
SCEP_HEADER Rest[]: SCEP_REQ_HEADER_SHORT
or
SCEP_HEADER Rest[]: SCEP_REQ_HEADER_LONG
- In the first case, Length1 = 4, DFlag = DFLAG_CONNECT_REJECT, and Length 3 = 0. - In the second case, Length1 = 0xff, DFlag = DFLAG_CONNECT_REJECT, and Length 3 = 0.
SCEP Disconnect PDU -------------------
A disconnect can be generated by either side of the connection, or by one of the transports at any time.
SCEP_HEADER Rest[]: SCEP_DISCONNECT
- For V1.0, Length1 = 2, and ReasonCode is a USHORT.
SCEP Command Request and Response PDUs (Non-fragmented) -------------------------------------------------------
SCEP_HEADER 2 bytes Rest[]: SCEP_REQ_HEADER_SHORT 4 + 0-254 bytes --------- 6 - 260 bytes or
SCEP_HEADER 2 bytes Rest[]: SCEP_REQ_HEADER_LONG 4 + 0-4090 bytes (1) ---------- 6 - 4096 bytes
- In either case, DFlag = DFLAG_SINGLE_PDU. - PduType = PDU_TYPE_REQUEST. - If Length1 = 0xff then the long version is used. - The Length1(2) field specifies the byte size from InfVersion to the end of the user data. If the total size will exceed the maximum PDU size then the request must be fragmented. - So the total PDU size is: 6 + Length1(2) bytes.
(1) Assuming the maximum PDU size is 4096 (fr:4).
SCEP Command Request and Response PDUs (Fragmented) ---------------------------------------------------
For requests these PDUs are generated when the PDU size is greater than that of the responder that you are connected to. For responses, the PDUs are fragmented when the returned data is greater than the maximum that the requester specified during the connection establishment.
SCEP_HEADER 2 bytes Rest[]: SCEP_REQ_HEADER_SHORT_FRAG 6 + 0-254 bytes --------- 8 - 260 bytes or
SCEP_HEADER 2 bytes Rest[]: SCEP_REQ_HEADER_LONG_FRAG 8 + 0-4088 bytes (1) --------- 10 - 4096 bytes
- For the first PDU fragment, DFlag = DFLAG_FIRST_FRAGMENT, for intermediate fragments, DFlag = DFLAG_FRAGMENT, and for the last fragment, DFlag = DFLAG_LAST_FRAGMENT. - PduType = PDU_TYPE_REQUEST for the request. - PduType = PDU_TYPE_REPLY_ACK or PDU_TYPE_REPLY_NACK in the response. - If Length1 = 0xff then the long version is used. - Length1(2) can not exceed the maximum PDU size - 6 bytes. - SequenceNo is 0 for the first PDU (NOTE: 4 bytes). - RestNo is the remaining number of PDUs to get. It is 1 for the last PDU (really, it says so in the spec!). So, a client should start this as the total number of PDUs in the first fragment (not really the number remaining). NOTE: 4 bytes.
(1) Assuming the maximum PDU size is 4096 (fr:4).
SCEP Abort PDU --------------
Use the abort to stop execution of a command (specified by the DestPid and CommandId) after ALL of the request PDUs have been sent. An abort PDU also has two possible formats.
SCEP_HEADER 2 bytes Rest[]: SCEP_REQ_HEADER_SHORT 34 bytes -- 36 bytes or
SCEP_HEADER 2 bytes Rest[]: SCEP_REQ_HEADER_LONG 36 bytes -- 38 bytes
- In either case, DFlag = DFLAG_SINGLE_PDU. - In either case, PduType = PDU_TYPE_ABORT. - For the short PDU, Length1 = 0x20 (32), and Length3 = 0x1c (28). - For the long PDU, Length1 = 0xff, Length2 = 0x20 (32), and Length3 = 0x1c (28).
SCEP Stop (Interrupt) PDU -------------------------
If an Abort PDU has been sent out to stop a command, and as the command is halted some response data has already been sent, the the responder will send this PDU. It appears that a Stop PDU should not be sent if no response has yet been sent back.
SCEP_HEADER 2 bytes Rest[]: SCEP_REQ_HEADER_SHORT 6 bytes -- 8 bytes or
SCEP_HEADER 2 bytes Rest[]: SCEP_REQ_HEADER_LONG 8 bytes -- 10 bytes
- In either case, DFlag = DFLAG_INTERRUPT. - For the short PDU, Length1 = 4, and Length3 = 0. - For the long PDU, Length1 = 0xff, Length2 = 4, and Length3 = 0.
Negotiation Information -----------------------
The negotiation information is used to convey the frame size, authentication data, and product information, etc.
Its structure is a version code (currently 0x11) followed by text in the following syntax:
NegInf -> Attribute ':' Spaces Value CrLf
Attribute -> AttribChar AttribChar
AttribChar-> 'a-zA-Z'
Value -> ValueChar Value ->
ValueChar -> 'ASCII string, bytes must be between 0x20 and 0x8e inclusive'
Spaces -> ' ' Spaces ->
CrLf -> 0x0d 0x0a
Attribute Meaning --------- ------- fr Frame (PDU) size. The sender requests the maximum receivable PDU size, the receiver decides the transmission PDU size in accordance with the senders requested PDU size. The maximum PDU size of the sender may be different than that of the receiver. The value is one of:
1 - 512 bytes PDU size (default). 2 - 1024 bytes PDU size. 3 - 2048 bytes PDU size. 4 - 4096 bytes PDU size.
id Product Identification string.
nm User name. any byte string that doesn't include CR or LF (note the conflict in by values with the syntax specification above). The user name may be up to 32 characters long.
pw Password. This is a MD5 encoded password expressed in a 16 byte "hex" string, no spaces are allowd. It appears that this will always be 32 characters long. For example: 0aff3728e4a62791337984282871a6bc
//--------------------------------------------------------------------
#endif
#endif //_SCEP_H_
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