TdsParserStaticMethods.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / SqlClient / TdsParserStaticMethods.cs / 1305376 / TdsParserStaticMethods.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
namespace System.Data.SqlClient {
    using System; 
    using System.Data.Common;
    using System.Data.ProviderBase;
    using System.Data.Sql;
    using System.Data.SqlTypes; 
    using System.Diagnostics;
    using System.Globalization; 
    using System.Runtime.CompilerServices; 
    using System.Runtime.InteropServices;
    using System.Security; 
    using System.Security.Permissions;
    using System.Text;
    using System.Threading;
    using System.Runtime.Versioning; 

    internal sealed class TdsParserStaticMethods { 
 
        private TdsParserStaticMethods() { /* prevent utility class from being insantiated*/ }
        // 
        // Static methods
        //

        // SxS: this method accesses registry to resolve the alias. 
        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] 
        static internal void AliasRegistryLookup(ref string host, ref string protocol) { 
            if (!ADP.IsEmpty(host)) {
                const String folder = "SOFTWARE\\Microsoft\\MSSQLServer\\Client\\ConnectTo"; 
                // Put a try...catch... around this so we don't abort ANY connection if we can't read the registry.
                string aliasLookup = (string) ADP.LocalMachineRegistryValue(folder, host);
                if (!ADP.IsEmpty(aliasLookup)) {
                    /* Result will be in the form of: "DBNMPNTW,\\blained1\pipe\sql\query". or 
                         Result will be in the form of: "DBNETLIB, via:\\blained1\pipe\sql\query".
 
                        supported formats: 
                            tcp	- DBMSSOCN,[server|server\instance][,port]
                            np - DBNMPNTW,[\\server\pipe\sql\query | \\server\pipe\MSSQL$instance\sql\query] 
                                  where \sql\query is the pipename and can be replaced with any other pipe name
                            via - [DBMSGNET,server,port | DBNETLIB, via:server, port]
                            sm - DBMSLPCN,server
 
                        unsupported formats:
                            rpc - DBMSRPCN,server,[parameters] where parameters could be "username,password" 
                            bv -  DBMSVINN,service@group@organization 
                            appletalk - DBMSADSN,objectname@zone
                            spx - DBMSSPXN,[service | address,port,network] 
                    */
                    // We must parse into the two component pieces, then map the first protocol piece to the
                    // appropriate value.
                    int index = aliasLookup.IndexOf(','); 

                    // If we found the key, but there was no "," in the string, it is a bad Alias so return. 
                    if (-1 != index) { 
                        string parsedProtocol = aliasLookup.Substring(0, index).ToLower(CultureInfo.InvariantCulture);
 
                        // If index+1 >= length, Alias consisted of "FOO," which is a bad alias so return.
                        if (index+1 < aliasLookup.Length) {
                            string parsedAliasName = aliasLookup.Substring(index+1);
 
                            // Fix bug 298286
                            if ("dbnetlib" == parsedProtocol) { 
                                    index = parsedAliasName.IndexOf(':'); 
                                    if (-1 != index && index + 1 < parsedAliasName.Length) {
                                        parsedProtocol = parsedAliasName.Substring (0, index); 
                                        if (SqlConnectionString.ValidProtocal (parsedProtocol)) {
                                            protocol = parsedProtocol;
                                            host = parsedAliasName.Substring(index + 1);
                                        } 
                                    }
                                } 
                            else { 
                                    protocol = (string)SqlConnectionString.NetlibMapping()[parsedProtocol];
                                    if (null != protocol) { 
                                        host = parsedAliasName;
                                }
                            }
                        } 
                    }
                } 
            } 
        }
 
        static internal Byte[] EncryptPassword(string password) {
            Byte[] bEnc = new Byte[password.Length << 1];
            int s;
            byte bLo; 
            byte bHi;
 
            for (int i = 0; i < password.Length; i ++) { 
                s = (int) password[i];
                bLo = (byte) (s & 0xff); 
                bHi = (byte) ((s >> 8) & 0xff);
                bEnc[i<<1] = (Byte) ( (((bLo & 0x0f) << 4) | (bLo >> 4)) ^  0xa5 );
                bEnc[(i<<1)+1] = (Byte) ( (((bHi & 0x0f) << 4) | (bHi >> 4)) ^  0xa5);
            } 
            return bEnc;
        } 
 
        [ResourceExposure(ResourceScope.None)] // SxS: we use this method for TDS login only
        [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] 
        static internal int GetCurrentProcessIdForTdsLoginOnly() {
            return SafeNativeMethods.GetCurrentProcessId();
        }
 

        [SecurityPermission(SecurityAction.Assert, Flags = SecurityPermissionFlag.UnmanagedCode)] 
        [ResourceExposure(ResourceScope.None)] // SxS: we use this method for TDS login only 
        [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)]
        static internal Int32 GetCurrentThreadIdForTdsLoginOnly() { 
#pragma warning disable 618
            return AppDomain.GetCurrentThreadId(); // don't need this to be support fibres;
#pragma warning restore 618
        } 

 
        [ResourceExposure(ResourceScope.None)] // SxS: we use MAC address for TDS login only 
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)]
        static internal byte[] GetNetworkPhysicalAddressForTdsLoginOnly() { 
            // NIC address is stored in NetworkAddress key.  However, if NetworkAddressLocal key
            // has a value that is not zero, then we cannot use the NetworkAddress key and must
            // instead generate a random one.  I do not fully understand why, this is simply what
            // the native providers do.  As for generation, I use a random number generator, which 
            // means that different processes on the same machine will have different NIC address
            // values on the server.  It is not ideal, but native does not have the same value for 
            // different processes either. 

            const string key        = "NetworkAddress"; 
            const string localKey   = "NetworkAddressLocal";
            const string folder     = "SOFTWARE\\Description\\Microsoft\\Rpc\\UuidTemporaryData";

            int result = 0; 
            byte[] nicAddress = null;
 
            object temp = ADP.LocalMachineRegistryValue(folder, localKey); 
            if (temp is int) {
                result = (int) temp; 
            }

            if (result <= 0) {
                temp = ADP.LocalMachineRegistryValue(folder, key); 
                if (temp is byte[]) {
                    nicAddress = (byte[]) temp; 
                } 
            }
 
            if (null == nicAddress) {
                nicAddress = new byte[TdsEnums.MAX_NIC_SIZE];
                Random random = new Random();
                random.NextBytes(nicAddress); 
            }
 
            return nicAddress; 
        }
        // translates remaining time in stateObj (from user specified timeout) to timout value for SNI 
        static internal Int32 GetTimeoutMilliseconds(long timeoutTime) {
            // User provided timeout t | timeout value for SNI | meaning
            // ------------------------+-----------------------+------------------------------
            //      t == long.MaxValue |                    -1 | infinite timeout (no timeout) 
            //   t>0 && tint.MaxValue |          int.MaxValue | must not exceed int.MaxValue 
 
            if (Int64.MaxValue == timeoutTime) {
                return -1;  // infinite timeout 
            }

            long msecRemaining = ADP.TimerRemainingMilliseconds(timeoutTime);
 
            if (msecRemaining < 0) {
                return 0; 
            } 
            if (msecRemaining > (long)Int32.MaxValue) {
                return Int32.MaxValue; 
            }
            return (Int32)msecRemaining;
        }
 
        static internal long GetTimeoutSeconds(int timeoutSeconds) {
            long result; 
            if (0 == timeoutSeconds) { 
                result = Int64.MaxValue; // no timeout...
            } 
            else {
                long ticksNow = ADP.TimerCurrent();
                result = ticksNow + ADP.TimerFromSeconds(timeoutSeconds);
            } 
            return result;
        } 
 
        static internal bool TimeoutHasExpired(long timeoutTime) {
            bool result = false; 

            if (0 != timeoutTime && Int64.MaxValue != timeoutTime) {
                result = ADP.TimerHasExpired(timeoutTime);
            } 
            return result;
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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