netcat源代码分析，doexec.c中的句柄

来源：互联网发布：fifa online3数据库15 编辑：程序博客网时间：2024/04/30 08:56

    Result = CreatePipe(&Session->ReadPipeHandle, &ShellStdoutPipe,
                          &SecurityAttributes, 0);
    if (!Result) {
        holler("Failed to create shell stdout pipe, error = %s",
           itoa(GetLastError(), smbuff, 10), NULL, NULL, NULL, NULL, NULL);
        goto Failure;
    }

   fprintf (stderr," Session->ReadPipeHandle = %x\n",Session->ReadPipeHandle);
   fprintf (stderr," ShellStdoutPipe = %x\n",ShellStdoutPipe);

    Result = CreatePipe(&ShellStdinPipe, &Session->WritePipeHandle,
                        &SecurityAttributes, 0);

    if (!Result) {
        holler("Failed to create shell stdin pipe, error = %s",
           itoa(GetLastError(), smbuff, 10), NULL, NULL, NULL, NULL, NULL);
        goto Failure;
    }

   fprintf (stderr," Session->WritePipeHandle = %x\n",Session->WritePipeHandle);
   fprintf (stderr," ShellStdinPipe = %x\n",ShellStdinPipe);

Session->ReadPipeHandle = 738

ShellStdoutPipe = 734
Session->WritePipeHandle = 72c

ShellStdinPipe = 730

上面是调试的结果，下面的是创建的两个管道，4个句柄，其中netcat.exe用到了2个句柄

cmd.exe用到了两个句柄。

ShellStdoutPipe(stdout)   --->   Session->ReadPipeHandle   ReadFile() --> net
   cmd.exe                                         netcat.exe
ShellStdinPipe (stdin )    <---   Session->WritePipeHandle WriteFile() <-- net