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[求助]
求助hook程序的注解
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有一下几段HOOK程序，看不太懂，求中文注解 NTSTATUS HookExistingNDISProtocols(void) { UINT *ProtocolPtr; NDIS_HANDLE hBogusProtocol = NULL; PNDIS_OPEN_BLOCK OpenBlockPtr = NULL; PNDIS_PROTOCOL_HOOK pNode; hBogusProtocol = RegisterBogusNDISProtocol(); if(hBogusProtocol == NULL) return STATUS_UNSUCCESSFUL; ProtocolPtr = (UINT*)hBogusProtocol; ProtocolPtr = (UINT*)((PBYTE)ProtocolPtr + sizeof(REFERENCE) + 8); ProtocolPtr = (UINT*)(*ProtocolPtr); while(ProtocolPtr != NULL) { OpenBlockPtr = (PNDIS_OPEN_BLOCK)(*ProtocolPtr); if(OpenBlockPtr != NULL) { pNode = NewNDISNode(); if(pNode != NULL) { pNode->ProtocolBindingContext = OpenBlockPtr->ProtocolBindingContext; pNode->MacBindingContext = OpenBlockPtr->MacBindingHandle; pNode->OpenBlockPtr = OpenBlockPtr; pNode->RealSendHandler = OpenBlockPtr->SendHandler; //How about WanSendHandler? pNode->RealPostNt31ReceiveHandler = OpenBlockPtr->PostNt31ReceiveHandler; InsertNDISNode(pNode); OpenBlockPtr->SendHandler = NDISSendHandler; //How about WanSendHandler? OpenBlockPtr->PostNt31ReceiveHandler = NDISPostNt31ReceiveHandler; } } ProtocolPtr = (UINT*)((PBYTE)ProtocolPtr + sizeof(REFERENCE) + 8); ProtocolPtr = (UINT*)(*ProtocolPtr); } DeregisterBogusNDISProtocol(hBogusProtocol); return STATUS_SUCCESS; } NTSTATUS HookExistingNDISProtocols(void) { UINT *ProtocolPtr; NDIS_HANDLE hBogusProtocol = NULL; PNDIS_OPEN_BLOCK OpenBlockPtr = NULL; PNDIS_PROTOCOL_HOOK pNode; hBogusProtocol = RegisterBogusNDISProtocol(); if(hBogusProtocol == NULL) return STATUS_UNSUCCESSFUL; ProtocolPtr = (UINT*)hBogusProtocol; ProtocolPtr = (UINT*)((PBYTE)ProtocolPtr + sizeof(REFERENCE) + 8); ProtocolPtr = (UINT*)(*ProtocolPtr); while(ProtocolPtr != NULL) { OpenBlockPtr = (PNDIS_OPEN_BLOCK)(*ProtocolPtr); if(OpenBlockPtr != NULL) { pNode = NewNDISNode(); if(pNode != NULL) { pNode->ProtocolBindingContext = OpenBlockPtr->ProtocolBindingContext; pNode->MacBindingContext = OpenBlockPtr->MacBindingHandle; pNode->OpenBlockPtr = OpenBlockPtr; pNode->RealSendHandler = OpenBlockPtr->SendHandler; //How about WanSendHandler? pNode->RealPostNt31ReceiveHandler = OpenBlockPtr->PostNt31ReceiveHandler; InsertNDISNode(pNode); OpenBlockPtr->SendHandler = NDISSendHandler; //How about WanSendHandler? OpenBlockPtr->PostNt31ReceiveHandler = NDISPostNt31ReceiveHandler; } } ProtocolPtr = (UINT*)((PBYTE)ProtocolPtr + sizeof(REFERENCE) + 8); ProtocolPtr = (UINT*)(*ProtocolPtr); } DeregisterBogusNDISProtocol(hBogusProtocol); return STATUS_SUCCESS; } NDIS_STATUS NDISSendHandler( IN NDIS_HANDLE MacBindingHandle, IN PNDIS_PACKET Packet) { PNDIS_PROTOCOL_HOOK Node; Node = FindNDISNode(MacBindingHandle,2); if(Node == NULL) return NDIS_STATUS_SUCCESS; return Node->RealSendHandler(MacBindingHandle,Packet); } NDIS_STATUS NDISPostNt31ReceiveHandler( IN NDIS_HANDLE ProtocolBindingContext, IN NDIS_HANDLE MacReceiveContext, IN PVOID HeaderBuffer, IN UINT HeaderBufferSize, IN PVOID LookAheadBuffer, IN UINT LookAheadBufferSize, IN UINT PacketSize) { PNDIS_PROTOCOL_HOOK Node; Node = FindNDISNode(ProtocolBindingContext,1); if(Node == NULL) return NDIS_STATUS_SUCCESS; return Node->RealPostNt31ReceiveHandler(ProtocolBindingContext,MacReceiveContext, HeaderBuffer,HeaderBufferSize,LookAheadBuffer,LookAheadBufferSize,PacketSize); } |
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nbjnh
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【答案】应助回帖
★ ★ ★ ★ ★
感谢参与，应助指数 +1
zhmindyx: 金币+5, ★★★★★最佳答案 2012-03-26 08:34:44
感谢参与，应助指数 +1
zhmindyx: 金币+5, ★★★★★最佳答案 2012-03-26 08:34:44
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NTSTATUS HookExistingNDISProtocols(void) { UINT *ProtocolPtr; NDIS_HANDLE hBogusProtocol = NULL; //定义一个假协议指针 PNDIS_OPEN_BLOCK OpenBlockPtr = NULL; PNDIS_PROTOCOL_HOOK pNode; hBogusProtocol = RegisterBogusNDISProtocol();//注册假协议，以获得协议链表指针 if(hBogusProtocol == NULL) return STATUS_UNSUCCESSFUL;//协议注册不成功，后面的没法玩了，退出 ProtocolPtr = (UINT*)hBogusProtocol; ProtocolPtr = (UINT*)((PBYTE)ProtocolPtr + sizeof(REFERENCE) + 8); ProtocolPtr = (UINT*)(*ProtocolPtr); //估计楼主可能是看不懂上面三句！要了解上面三句先要清楚NDIS_HANDLE的结构。 //第二句是算取ndisProtocolList指针位置；第三句是取该协议链表的地址 /********************************************************************* struct PROTOCOL_HANDLE{ LIST_ENTRY protocolEntry; // +sizeof(REFERENCE) ULONG UnKnown1[2]; // +8 PLIST_ENTRY ndisProtocolList; _NDIS50_PROTOCOL_CHARACTERISTICS Characteristics; _WORK_QUEUE_ITEM Queue; KMUTEX Mutex; ULONG Unknown3[5]; USHORT NameBuff[Characteristics->Name.Length+1]; };//本结构从NdisRegisterProtocol中直接导出，也可以认为NDIS_HANDLE结构 //其实就是NDIS_OPEN_BLOCK结构即 struct _NDIS_PROTOCOL_BLOCK { PNDIS_OPEN_BLOCK OpenQueue; REFERENCE Ref; UINT Length; NDIS50_PROTOCOL_CHARACTERISTICS ProtocolCharacteristics; struct _NDIS_PROTOCOL_BLOCK *NextProtocol; ULONG MaxPatternSize; #if defined(NDIS_WRAPPER) struct _NDIS_PROTOCOL_FILTER * ProtocolFilter[NdisMediumMax+1]; WORK_QUEUE_ITEM WorkItem; KMUTEX Mutex; PKEVENT DeregEvent; #endif }; //不管是哪一个结构，总之ProtocolPtr最后指向协议链表的起点。 *********************************************************************/ while(ProtocolPtr != NULL) { //循环处理协议链表 OpenBlockPtr = (PNDIS_OPEN_BLOCK)(*ProtocolPtr);//取一个协议 if(OpenBlockPtr != NULL) {//如果协议不为空 pNode = NewNDISNode();//创建一个新结点，用于保存原始协议数据，以备恢复HOOK if(pNode != NULL) { pNode->ProtocolBindingContext = OpenBlockPtr->ProtocolBindingContext; pNode->MacBindingContext = OpenBlockPtr->MacBindingHandle; pNode->OpenBlockPtr = OpenBlockPtr; pNode->RealSendHandler = OpenBlockPtr->SendHandler; //How about WanSendHandler? pNode->RealPostNt31ReceiveHandler = OpenBlockPtr->PostNt31ReceiveHandler; InsertNDISNode(pNode); OpenBlockPtr->SendHandler = NDISSendHandler;//修改协议发送例程入口 //How about WanSendHandler? OpenBlockPtr->PostNt31ReceiveHandler = NDISPostNt31ReceiveHandler;//修改协议接收例程入口 /**************************************************************************************** 当网卡有数据包进入时，会通过表中ReceiveHandle或ReceivePacketHandler通知协议驱动程序有一 个该协议的数据包进入，反之协议驱动程序是通过SendHandler或SendPacketsHandler函数向网卡驱动 发送数据包到网络上去的。只要能够将每一个协议程序所填写的派发函数指向自己的函数,就能成功的 对数据包进行拦截。从上面两句代码来看，所有协议收、发例程全部被重新指向到NDISSendHandler() 和NDISPostNt31ReceiveHandler()函数中，那么所有的过滤工作将在这两个函数中完成，并且完成过滤 后，再将数据包转给原来的例程进行处理。 *****************************************************************************************/ } } ProtocolPtr = (UINT*)((PBYTE)ProtocolPtr + sizeof(REFERENCE) + 8); ProtocolPtr = (UINT*)(*ProtocolPtr); //上面两句，计算下一个协议入口。 } DeregisterBogusNDISProtocol(hBogusProtocol); return STATUS_SUCCESS; } NDIS_STATUS NDISSendHandler( IN NDIS_HANDLE MacBindingHandle, IN PNDIS_PACKET Packet) { PNDIS_PROTOCOL_HOOK Node; Node = FindNDISNode(MacBindingHandle,2); if(Node == NULL) return NDIS_STATUS_SUCCESS; return Node->RealSendHandler(MacBindingHandle,Packet); //发送例程没有做任何处理，直接将数据包传给保存在Node中的原例程处理。 //当然，如果需要做过滤的话，也可以添代码。 } NDIS_STATUS NDISPostNt31ReceiveHandler( IN NDIS_HANDLE ProtocolBindingContext, IN NDIS_HANDLE MacReceiveContext, IN PVOID HeaderBuffer, IN UINT HeaderBufferSize, IN PVOID LookAheadBuffer, IN UINT LookAheadBufferSize, IN UINT PacketSize) { PNDIS_PROTOCOL_HOOK Node; Node = FindNDISNode(ProtocolBindingContext,1); if(Node == NULL) return NDIS_STATUS_SUCCESS; return Node->RealPostNt31ReceiveHandler(ProtocolBindingContext,MacReceiveContext, HeaderBuffer,HeaderBufferSize,LookAheadBuffer,LookAheadBufferSize,PacketSize); //收到的包出没有处理，也是直接传给原例程处理的，自己加过滤代码吧。看样子应该是一个 //防火墙的框架程序。 } |
3楼2012-03-22 09:15:37
cmdblock
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2楼2012-03-21 10:19:55
