srvstruc.h

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//  header.
//
typedef struct srv_tdshdr {
    BYTE        type;       // io packet type
    BYTE        status;     // io packet status
    DBUSMALLINT length;     // io packet length
    DBUSMALLINT channel;    // io packet subchannel
    BYTE        packet;     // io packet number
    BYTE        window;     // io packet window size

} SRV_TDSHDR;

//  SRV_INPUTBUF
//  This structure maintains the read information when
//  pre-reading packets.
//

typedef struct srv_inputbuf {
    BYTE * pBuffer;
    DWORD  ioStatus;
    DWORD  ioRecvCnt;
    struct srv_inputbuf * pNext;
} SRV_INPUTBUF;

// SRV_COMPORT_QUEUE
// Queue entry for completion port requests.
//
typedef struct srv_comport_queue
{
	struct srv_comport_queue*	Flink;
	struct srv_comport_queue*	Blink;
} SRV_COMPORT_QUEUE;

// SRV_COMPORT_BUF
//	Description of a buffer passed through the srv_post_completion_queue
//  entry point. These buffers are typically posted by the server to
//	perform work on a worker thread that can't be handled by the currently
//	executing thread.
//
typedef struct srv_comportbuf 
{
	SRV_COMPORT_QUEUE	queue;

	// Overlapped structure passed through srv_post_completion_queue
	// overlapped.Offset contains the address of this structure such that
	// 
	OVERLAPPED	overlapped;
	DWORD		message_size;
	BYTE		message [1];
} SRV_COMPORT_BUF;

// WARNING! There is code that assumes it can get to the "last" input
// buffer by looking at the current->pNext buffer. (i.e. It assumes
// SRV_NUMINPUTBUFS == 2).
//
#define SRV_NUMINPUTBUFS 2

//
//  SRV_IO
//  This is the data structure used for reading and writing client
//  connection data for a particular server task.
//
typedef struct srv_io {
    void * server_ep;       // server side endpoint
#ifdef BRIDGE
    void * client_ep;       // client side endpoint
    BOOL       fCSerror;        // flag indicate client-side error
#endif
    HANDLE      cs_sub_handle;  // client-side subchannel local handle
    BYTE  * outbuff;        // send: start of send buffer
    BYTE  * p_outbuff;      // send: next place in buffer
    WORD        n_outbuff;      // send: room left in send buffer
    BYTE  * inbuff;         // recv: start of read buffer
    BYTE  * p_inbuff;       // recv: next place in buffer
    WORD        n_inbuff;       // recv: room left in read buffer
    int         SQLspanned;     // flag indicating that the SQL command
                                //  has spanned more that 1 network buffer.
    int cbflag;	  				// flag indicating that a client buffer is
                                //  available.
    DBUSMALLINT channel;        // io packet subchannel
    BYTE        packet;         // io packet number
    BYTE        window;         // io packet window size
    HANDLE      ioEvent;        // io event handle
    OVERLAPPED  ioOverlapped;   // io overlapped structure.
    SRV_INPUTBUF * pNextInBuf;  // current io input buffer index
    SRV_INPUTBUF   ioInputBuffers[SRV_NUMINPUTBUFS]; // io input buffers
    HANDLE      ss_sub_handle;  // server-side subchannel local handle
    WORD packetsize;	    // TDS packet size
} SRV_IO;

//
//  SRV_COLDESC: column description array (used by srv_describe & srv_sendrow)
//
typedef struct srv_coldesc {
    unsigned long otype;        // output data type
    unsigned long olen;         // length
    unsigned long itype;        // input data type
    unsigned long ilen;         // length
    BYTE    *data;		// data buffer address
    DBINT    user_type;		// user-defined data type
    BYTE     precision; 	// precision
    BYTE     scale;		// scale
} SRV_COLDESC;

//
//  SRV_RPCp: RPC parameter information
//
typedef struct srv_rpcp {
    BYTE          len;          // length of RPC parameter name
    BYTE    * rpc_name;     // pointer to the RPC parameter name
    BYTE          status;       // return status, 1 = passed by reference
    unsigned long user_type;    // User-defined data type
    BYTE          type;         // data type
    unsigned long maxlen;       // maximum possible data length
    unsigned long actual_len;   // actual data length
    void    * value;        // the actual data
} SRV_RPCp;

typedef struct srv_comport {
    HANDLE hdl;
    DWORD  cpu;
} SRV_COMPORT;

//
//  SRV_PROC:   This is the main connection structure
//
typedef struct srv_proc 
{
    WORD          tdsversion;   // version of tds detected from client
                                //   0x3400 = 3.4, 0x4000 = 4.0
    WORD          status;       // status of this SRV_PROC
    SRV_IO        srvio;        // I/O structure of srvproc
    SRV_LOGINREC  login;        // login record received from the client
    void        * langbuff;     // pointer to language buffer
    unsigned long langlen;      // length of language buffer
    unsigned int  event;        // event variable
    void        * server;       // pointer to associated SRV_SERVER structure
    char        * threadstack;  // stack pointer of event thread stack
    THREAD        threadID;     // thead ID associated with this SRV_PROC
    HANDLE        threadHDL;    // thread handle for resume and suspend
    HANDLE        iowakeup;     // event handle to wait on for overlapped io
                                // and more. Passed on to SQL Server and netlibs.
    HANDLE        exited;       // semaphore indicating that thread
                                //  associated with this SRV_PROC has exited
    DBINT         rowsent;      // # of rows sent to client
    SRV_COLDESC * coldescp;     // pointer to column description array
    DBUSMALLINT   coldescno;    // count of column descriptions
    BYTE        * colnamep;     // pointer to column name list
    WORD          colnamelen;   // length of column name list
    void        * userdata;     // pointer to user's private data area
    void        * event_data;   // pointer to event data area
    BYTE          serverlen;    // length of server name
    BYTE        * servername;   // name of server
    
    //  RPC info
    //
    BYTE           rpc_active;          // flag indicating active RPC (TRUE=active)
    BYTE           rpc_server_len;      // length of RPC server name
    BYTE         * rpc_server;          // name of RPC server
    BYTE           rpc_database_len;    // length of RPC database name
    BYTE         * rpc_database;        // name of RPC database
    BYTE           rpc_owner_len;       // length of RPC owner name
    BYTE         * rpc_owner;           // name of RPC owner
    BYTE           rpc_proc_len;        // length of RPC or stored procecedure name
    BYTE         * rpc_proc_name;       // name of RPC or stored procedure
    unsigned int   rpc_proc_number;     // number of RPC "procedure_name;number"
    unsigned int   rpc_linenumber;      // line number batch error occurred on.
    unsigned short rpc_options;         // recompile option flag (bit 0)
    unsigned short rpc_num_params;      // number of RPC parameters
    SRV_RPCp    ** rpc_params;          // array of pointers to each RPC paramater
    
    // Return information for non-remote procedure call client command.
    // This information is provided by the function srv_returnval().
    // flag indicating active non-RPC values (TRUE = active)
    //
    BYTE non_rpc_active;

    // number of non-RPC parameters
    //
    unsigned short non_rpc_num_params;

    // array of pointers to each non-RPC paramater
    //
    SRV_RPCp ** non_rpc_params;
    
    // temporary work buffer
    //
    char temp_buffer[100];

    // array of subchannel structures
    //
    SRV_SUBCHANNEL * (*subprocs);

    // Data Translation information
    //
    TRANSLATION_INFO     translation_info;
    struct srv_listentry IOListEntry;
    struct srv_listentry CommandListEntry;
    PSRV_LISTHEAD        pNetListHead;
    BOOL                 bNewPacket;
    long	             StatusCrit;	// critical section to check attentions
    void               * serverdata;    // private data area used ONLY by SQL Server
    SRV_SUBCHANNEL     * subchannel;

    // Pre && Post Handler pointers
    //
    SRV_PEVENTS * pre_events;
    SRV_PEVENTS * post_events;

    // current position in language buffer used by processRPC
	// 
    void * p_langbuff;	

	BOOL    fSecureLogin;

	// Set by the server when making an outbound call to an XP.
	//
	BOOL    fInExtendedProc;

	// If TRUE indicates the current buffer is from
	// srv_post_completion_queue and the buffer should be
	// deallocated when the current work is completed.  If
	// FALSE the current buffer came from the network and a
	// new read should be posted on the net.
	//
	unsigned    fLocalPost:1;

	// If TRUE an XP associated with this srvproc made a call back into
	// the server on a bound connection. This flag is used to allow the
	// calling session to wait for logout processing of the XP to complete
	//
	unsigned	fMadeBoundCall:1;

	// Filler to align after flags above.
	//
	unsigned	uFill1:30;

	// List of requests posted using srv_post_completion_queue. Entries are
	// dynamically allocated inside srv_post_completion_queue and enqueued
	// in netIOCompletionRoutine. After the request has been processed the
	// entry is removed from this queue and deallocated.
	//
	// NOTE: Must hold SRV_PROC spinlock while altering queue.
	//
	SRV_COMPORT_QUEUE	comport_queue;

    // Data pointers reserved for the Starfighter team
    //
    void * pSF1;    // Currently in use by SQLTrace
    void * pSF2;    // Reserved

    // Pre and Post handler semephores used during handler instals
    // and deinstals.
    //
    HANDLE hPreHandlerMutex;
    HANDLE hPostHandlerMutex;
	BOOL   bSAxp;		// Used by XP's to determine if running as SA

} SRV_PROC;

typedef struct srv_control 
{
    unsigned int status;        // status of process
    unsigned int connects;      // current number of connections

    SRV_PROC * (* srvprocs);    // array of SRV_PROC connection structures

    // semaphore indicating that the connects counter is being accessed or
    // modified
    //
    HANDLE connects_sem;
    
    // semaphore indicating that thread has started
    //
    HANDLE start_sem;
    
    // semaphore indicating that some event has occurred
    //
    HANDLE event_sem;
    
    // semaphore indicating that log file is being written to
    //
    HANDLE log_sem;
    
    // shutdown critical section
    //
    long ShutDownCrit;

    // Network list critical section
    //
    long NetQueueCrit;

    // Thread Pool critical section
    //
    long ThreadPoolCrit;

    // print screen critical section
    //
    long ScrnPrnt;

    unsigned int remote_sites;      // current number of remote sites connected
    unsigned int remote_connects;   // current number of in/out remote connections

    // semaphore indicating that the remote sites counter is being accessed or
    // modified
    //
    HANDLE remote_sites_sem;

    // semaphore indicating that the remote connections counter is being accessed or
    // modified
    //
    HANDLE remote_connects_sem;

    // network request queue list
    //
    SRV_QUEUEHEAD netQueueList;
    int           numNetQueueEntries;
    int           maxNetQueueEntries;

    // command queue list
    //
    PSRV_LISTHEAD CommandQueueHead;

    // Server statistics.
    //
    SRV_STATS   Stats;

    DWORD * pSharedCounter;

    HANDLE srvproc_mutex;

    DWORD  dwWorkingThreadCnt;
    DWORD  maxWorkingThreadCnt;

    SRV_COMPORT *comport;
    BYTE   num_comports;

    BYTE   ProcessorCnt;

} SRV_CONTROL;

typedef struct srv_server {
    LGFARPROC  SSNetLib[SRV_SERVNETFUNCS];  // Server Side NetLib functions
    HANDLE     SSModule;                    // Server Side DLL
    DWORD      ep_size;
    void * listen_ep;
#ifdef BRIDGE
    LGFARPROC CSNetLib[SRV_CLIENTNETFUNCS]; // Client Side NetLib functions
    HANDLE    CSModule;                     // Client Side DLL
    char      client_name[SRV_MAXFILENAME];
#endif
    THREAD net_threadID;        // thead ID of client network event thread
    HANDLE net_threadHDL;       // thread handle for resume and suspend

    //
    // connection information
    //
    char connect_name[SRV_MAXFILENAME];
    char connect_dll[SRV_MAXFILENAME];
    char connect_version[SRV_MAXFILENAME];

    //
    // temporary work buffer
    //
    char temp_buffer[100];
    //
    // server configuration information
    //
    SRV_CONFIG config;
    // server control information
    //
    SRV_CONTROL * control;

    // define the event handlers         
    //
    SRV_EVENTS * events;

    // Pre && Post Handler pointers
    SRV_PEVENTS * pre_events;
    SRV_PEVENTS * post_events;

    // Pre and Post handler semephores
    //
    HANDLE hPreHandlerMutex;    // Single writer
    HANDLE hPostHandlerMutex;
    HANDLE hPreHandlerSem;      // Multiple reader
    HANDLE hPostHandlerSem;

} SRV_SERVER;

// Private structure used to export server entry points as ODS callbacks
// for SQLServer use only.
//
typedef struct ods_callbacks
{
    int (*sql_getbindtoken) (void*, char*);
	void (*sql_getdtcxact) (void*, void**);
    int (*sql_startinexec) (void*);
    void (*sql_stopinexec) (void*);
    // Place new callbacks at the end of the structure.

} ODS_CALLBACKS;