INTERPROCESS COMMUNICATION in Software

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8 INTERPROCESS COMMUNICATION
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Examining the entire stack of the thread identified previously helps identify exactly what function call hangs and what layers are involved in handling that call In the case shown in Listing 86, the client call uses DCOM as indicated by the use of the methods in ole32dll, which in turn uses RPC and, ultimately, LPC to dispatch the call to the server Listing 86 Typical stack of clients using DCOM over LRPC
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0:003> ~0k ChildEBP RetAddr 0012f6e4 7c90e3ed 0012f6e8 77e7cc55 0012f734 77e7aae6 0012f740 776016bf 0012f75c 776011b6 0012f778 7760109a 0012f858 7751047c 0012f8c4 77510414 0012f918 77ef3db5 0012f934 77ef3ead 0012fd10 77ef3e42
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ntdll!KiFastSystemCallRet ntdll!NtRequestWaitReplyPort+0xc RPCRT4!LRPC_CCALL::SendReceive+0x228 RPCRT4!I_RpcSendReceive+0x24 ole32!ThreadSendReceive+0xf5 ole32!CRpcChannelBuffer::SwitchAptAndDispatchCall+0x13d ole32!CRpcChannelBuffer::SendReceive2+0xb9 ole32!CAptRpcChnl::SendReceive+0xab ole32!CCtxComChnl::SendReceive+0x113 RPCRT4!NdrProxySendReceive+0x43 RPCRT4!NdrClientCall2+0x1fa
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(continues)
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Interprocess Communication
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Listing 86 Typical stack of clients using DCOM over LRPC (continued)
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0012fd30 0012fd40 0012fe48 0012ff54 0012ffb8 0012ffc0 0012fff0 77e8a433 0042ea5b 0042e7ae 0042f902 0042f6bd 7c816fd7 00000000 RPCRT4!ObjectStublessClient+0x8b RPCRT4!ObjectStubless+0xf 08CLI!MTAClientCall+0x7b 08CLI!wmain+0xae 08CLI!wmainCRTStartup+0x252 08CLI!wmainCRTStartup+0xd kernel32!BaseProcessStart+0x23
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Even if the relevant client thread has been identified, it makes sense to understand why a second thread is waiting on an outstanding LPC call with a stack shown in Listing 87 The LPC function used in this case, ntdll!NtReplyWaitReceivePort, indicates a server thread waiting to receive a new operation request Although it might seem a little bit confusing that each DCOM client also has a server role, at the beginning of the chapter, we said that DCOM provides added value functionality to the RPC stack, such as distributed garbage collection This thread is part of this entire mechanism peculiar to this client process The client process is notified on this thread when the server goes away, and it cleans up all the structures associated with that server Listing 87 Typical stack of a server thread waiting for a new request on DCOM over LRPC
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ntdll!KiFastSystemCallRet ntdll!NtReplyWaitReceivePortEx+0xc RPCRT4!LRPC_ADDRESS::ReceiveLotsaCalls+0xf4 RPCRT4!RecvLotsaCallsWrapper+0xd RPCRT4!BaseCachedThreadRoutine+0x79 RPCRT4!ThreadStartRoutine+0x1a kernel32!BaseThreadStart+0x37
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NOTE Similar to the naming convention of the CCALL objects, the naming convention for the ADDRESS objects is a good indication of the protocol the process is listening to LRPC_ADDRESS is the server side waiting to handle local calls over LPC; OSF_ADRESS indicates that the server waits on connection-based protocols, such as TCP/IP or named pipes; and DG_CCALL indicates that the server waits on a datagram-based protocol, such as UDP The relationship between those protocols can be seen in Figure 81
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Troubleshooting Local Communication
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At this time, there are several ways to find out the server thread that processes the client requests The first method uses LPC debugging capabilities to track the message being processed, a method requiring kernel mode debugger In the next step, the engineer hooks the kernel mode debugger to the system or uses it from inside the system in local mode, as described in the 2 The remaining steps in this section are performed from within the kernel mode debugger The LRPC calls can also be tracked by the same methods used in tracking remote calls, methods using RPC troubleshooting state information This method is documented in the Troubleshooting Remote Communication section, and it can be used without a problem in the LRPC communication Another option can be to interpret information already available on the client thread and to extract the server information from the MSRPC structures used when making the call Unfortunately, that method is not possible using public symbols It also requires a deep knowledge of the internal structures stored inside MSRPC This method is the least attractive for developers without access to rpcrt4dll private symbols The same instance of the 08cliexe process started in Listing 85 is inspected with the kernel mode debugger We use the !process extension command to list all process threads, as shown in Listing 88 Listing 88 Listing thread summary information
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kd> !process 5b4 4 Searching for Process with Cid == 5b4 PROCESS ffaa62f0 SessionId: 0 Cid: 05b4 Peb: 7ffde000 DirBase: 0a5d0000 ObjectTable: e10a97d0 HandleCount: Image: 08cliexe THREAD ffb10020 THREAD ffafd698 THREAD ffabada8 Cid 05b404f8 Cid 05b401d0 Cid 05b40278
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