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Imported Upstream version 4.6.0.125
Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4
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//------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------
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namespace System.ServiceModel.Transactions
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{
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.IO;
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using System.Net;
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using System.Runtime;
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using System.Security.Permissions;
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using System.Text;
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using Microsoft.Transactions.Wsat.Protocol;
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using Microsoft.Transactions.Wsat.Recovery;
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class WhereaboutsReader
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{
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string hostName;
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ProtocolInformationReader protocolInfo;
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// Whereabouts internals
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static Guid GuidWhereaboutsInfo = new Guid("{2adb4462-bd41-11d0-b12e-00c04fc2f3ef}");
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const long STmToTmProtocolSize = 4 + 4;
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enum TmProtocol
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{
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TmProtocolNone = 0,
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TmProtocolTip = 1,
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TmProtocolMsdtcV1 = 2,
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TmProtocolMsdtcV2 = 3, // unicode host names in nameobject blobs etc
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TmProtocolExtended = 4 // other stuff (e.g., WS-AT)
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}
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public WhereaboutsReader(byte[] whereabouts)
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{
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MemoryStream mem = new MemoryStream(whereabouts,
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0,
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whereabouts.Length,
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false,
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true); // Enable calls to GetBuffer()
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DeserializeWhereabouts(mem);
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}
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public string HostName
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{
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get { return this.hostName; }
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}
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public ProtocolInformationReader ProtocolInformation
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{
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get { return this.protocolInfo; }
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}
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[SuppressMessage(FxCop.Category.Security, FxCop.Rule.AptcaMethodsShouldOnlyCallAptcaMethods, Justification = "The calls to SerializationException and SerializationUtils are safe.")]
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void DeserializeWhereabouts(MemoryStream mem)
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{
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// guidSignature
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Guid signature = SerializationUtils.ReadGuid(mem);
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if (signature != GuidWhereaboutsInfo)
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
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new SerializationException(SR.GetString(SR.WhereaboutsSignatureMissing)));
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}
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// cTmToTmProtocols
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uint cTmToTmProtocols = SerializationUtils.ReadUInt(mem);
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// Make sure that cTmToTmProtocols is at least plausible
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if (cTmToTmProtocols * STmToTmProtocolSize > mem.Length - mem.Position)
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
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new SerializationException(SR.GetString(SR.WhereaboutsImplausibleProtocolCount)));
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}
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// Loop through each protocol
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for (uint i = 0; i < cTmToTmProtocols; i++)
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{
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DeserializeWhereaboutsProtocol(mem);
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}
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// Require a host name
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if (string.IsNullOrEmpty(this.hostName))
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
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new SerializationException(SR.GetString(SR.WhereaboutsNoHostName)));
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}
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}
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[SuppressMessage(FxCop.Category.Security, FxCop.Rule.AptcaMethodsShouldOnlyCallAptcaMethods, Justification = "The calls to SerializationUtils are safe.")]
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void DeserializeWhereaboutsProtocol(MemoryStream mem)
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{
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// tmprotDescribed
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TmProtocol tmprotDescribed = (TmProtocol)SerializationUtils.ReadInt(mem);
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// cbTmProtocolData
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uint cbTmProtocolData = SerializationUtils.ReadUInt(mem);
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switch (tmprotDescribed)
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{
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case TmProtocol.TmProtocolMsdtcV2:
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ReadMsdtcV2Protocol(mem, cbTmProtocolData);
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break;
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case TmProtocol.TmProtocolExtended:
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ReadExtendedProtocol(mem, cbTmProtocolData);
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break;
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default:
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// We don't care about this protocol
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SerializationUtils.IncrementPosition(mem, cbTmProtocolData);
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break;
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}
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// Align the cursor to a 4-byte boundary
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SerializationUtils.AlignPosition(mem, 4);
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}
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[SuppressMessage(FxCop.Category.Security, FxCop.Rule.AptcaMethodsShouldOnlyCallAptcaMethods, Justification = "The calls to SerializationException and SerializationUtils are safe.")]
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void ReadMsdtcV2Protocol(MemoryStream mem, uint cbTmProtocolData)
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{
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const int MaxComputerName = 15;
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//
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// The host name is encoded in unicode format
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// It is followed by a null-terminating unicode character,
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// plus some padding to align on 4
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//
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// Reject host names of disproportionate size
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if (cbTmProtocolData > (MaxComputerName + 1) * 2)
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
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new SerializationException(SR.GetString(SR.WhereaboutsImplausibleHostNameByteCount)));
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}
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byte[] chars = SerializationUtils.ReadBytes(mem, (int)cbTmProtocolData);
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// Count the bytes until the first null terminating character
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int cbString = 0;
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while (cbString < cbTmProtocolData - 1 &&
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(chars[cbString] != 0 || chars[cbString + 1] != 0))
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{
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cbString += 2;
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}
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if (cbString == 0)
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
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new SerializationException(SR.GetString(SR.WhereaboutsInvalidHostName)));
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}
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try
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{
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this.hostName = Encoding.Unicode.GetString(chars, 0, cbString);
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}
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catch (ArgumentException e)
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
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new SerializationException(SR.GetString(SR.WhereaboutsInvalidHostName), e));
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}
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}
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// The demand is not added now (in 4.5), to avoid a breaking change. To be considered in the next version.
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/*
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[PermissionSet(SecurityAction.Demand, Unrestricted = true)] // because we use ProtocolInformationReader, which is defined in a non-APTCA assembly; WSATs are not supported in partial trust, so customers should not be broken by this demand
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*/
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void ReadExtendedProtocol(MemoryStream mem, uint cbTmProtocolData)
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{
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// Read the WSAT1.0 protoocol identifier
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Guid guid = SerializationUtils.ReadGuid(mem);
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if (guid == PluggableProtocol10.ProtocolGuid || guid == PluggableProtocol11.ProtocolGuid)
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{
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// This is the WS-AT extended whereabouts blob
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this.protocolInfo = new ProtocolInformationReader(mem);
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}
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else
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{
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// Some other gateway protocol... Skip the rest of the data
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SerializationUtils.IncrementPosition(mem, cbTmProtocolData - 16);
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}
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}
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}
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}
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