91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
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/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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Chollian2000.cpp
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Abstract:
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The application has two problems.
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1. it is expecting metric value 1. it is ok in win9x and win2k but it's not the
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case in winXP.
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2. the application calls CreateIpForwardEntry with MIB_IPPROTO_LOCAL.
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it will fail in winXP. the application should use MIB_IPPROTO_NETMGMT.
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The GetIpForwardTable and CreateIpForwardEntry are shimed to fix this problem.
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In GetIpForwardTable, I changed the metric value to 1. In CreateIpForwardEntry,
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I changed MIB_IPPROTO_LOCAL to MIB_IPPROTO_NETMGMT.
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History:
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06/12/2001 zhongyl Created
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--*/
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#include "precomp.h"
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#include "iphlpapi.h"
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IMPLEMENT_SHIM_BEGIN(Chollian2000)
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#include "ShimHookMacro.h"
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//
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// Add APIs that you wish to hook to this macro construction.
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//
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(CreateIpForwardEntry)
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APIHOOK_ENUM_ENTRY(GetIpForwardTable)
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APIHOOK_ENUM_END
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BOOL
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APIHOOK(CreateIpForwardEntry)(
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PMIB_IPFORWARDROW pRoute
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)
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{
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DWORD dwReturn;
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if (pRoute != NULL)
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pRoute->dwForwardProto = MIB_IPPROTO_NETMGMT;
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// The application used MIB_IPPROTO_LOCAL. It was ok for Win2k but it fails on WinXP. Change it to MIB_IPPROTO_NETMGMT
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dwReturn = ORIGINAL_API(CreateIpForwardEntry)(pRoute);
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return dwReturn;
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}
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BOOL
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APIHOOK(GetIpForwardTable)(
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PMIB_IPFORWARDTABLE pIpForwardTable,
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PULONG pdwSize,
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BOOL bOrder
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)
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{
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DWORD dwReturn;
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dwReturn = ORIGINAL_API(GetIpForwardTable)(pIpForwardTable, pdwSize, bOrder);
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if (pIpForwardTable != NULL)
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if (pIpForwardTable->dwNumEntries > 0)
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pIpForwardTable->table[0].dwForwardMetric1 = 1;
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// The application expects the Metric value to be one. In WinXP, the value is changed to 30. Application should not expect a fixed value here.
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return dwReturn;
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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//
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// Add APIs that you wish to hook here. All API prototypes
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// must be declared in Hooks\inc\ShimProto.h. Compiler errors
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// will result if you forget to add them.
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//
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APIHOOK_ENTRY(iphlpapi.dll,GetIpForwardTable)
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APIHOOK_ENTRY(iphlpapi.dll,CreateIpForwardEntry)
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HOOK_END
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IMPLEMENT_SHIM_END
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