[hbelusca] 61290: [NTVDM] Hackplement BOP_CMD function 0x08: "Launch external command". Still WIP. Explanation: Launching a command from command.com starts (under certain conditions not implemented...

Author: hbelusca
Date: Wed Dec 18 01:16:54 2013
New Revision: 61290

URL: http://svn.reactos.org/svn/reactos?rev=61290&view=rev
Log:
[NTVDM]
Hackplement BOP_CMD function 0x08: "Launch external command". Still WIP.
Explanation: Launching a command from command.com starts (under certain conditions not
implemented there) "cmd.exe /c <the_command>"

See
https://groups.google.com/forum/#!topic/microsoft.public.win2000.cmdprompt.…
and http://technet.microsoft.com/en-us/library/cc723564.aspx#XSLTsection1231211…
subsection "CMD.EXE and COMMAND.COM":
"Be aware that a command shell is not an MS-DOS command prompt, even though it shares
the same icon.
The Windows NT command shell is a full 32-bit Windows NT console application that resides
in the CMD.EXE executable file.
The MS-DOS command prompt is a 16-bit DOS application that resides in the COMMAND.COM
executable file.
Because COMMAND.COM is a 16-bit DOS executable, Windows NT executes this shell within a
Windows NT virtual DOS machine (VDM).
COMMAND.COM is supplied primarily for compatibility with MS-DOS.
[...]
This behavior reveals a quite subtle feature of Windows NT that is very important. The
16-bit MS-DOS shell (COMMAND.COM)
that ships with Windows NT is specially designed for Windows NT. When a command is entered
for execution by this shell,
it does not actually execute it. Instead, it packages the command text and sends it to a
32-bit CMD.EXE command shell for
execution. Because all commands are actually executed by CMD.EXE (the Windows NT command
shell), the 16-bit shell inherits
all the features and facilities of the full Windows NT shell."


Modified:
    branches/ntvdm/subsystems/ntvdm/dos.c

Modified: branches/ntvdm/subsystems/ntvdm/dos.c
URL:
http://svn.reactos.org/svn/reactos/branches/ntvdm/subsystems/ntvdm/dos.c?re…
==============================================================================
--- branches/ntvdm/subsystems/ntvdm/dos.c	[iso-8859-1] (original)
+++ branches/ntvdm/subsystems/ntvdm/dos.c	[iso-8859-1] Wed Dec 18 01:16:54 2013
@@ -1422,7 +1422,77 @@
     BYTE FuncNum = *(PBYTE)SEG_OFF_TO_PTR(getCS(), getIP());
     setIP(getIP() + 1);
 
-    DPRINT1("Unknown DOS CMD Interpreter BOP Function: 0x%02X\n", FuncNum);
+    switch (FuncNum)
+    {
+        case 0x08: // Launch external command
+        {
+#define CMDLINE_LENGTH  1024
+
+            BOOL Result;
+            DWORD dwExitCode;
+
+            LPSTR Command = (LPSTR)SEG_OFF_TO_PTR(getDS(), getSI());
+            CHAR CommandLine[CMDLINE_LENGTH] = "";
+            STARTUPINFOA StartupInfo;
+            PROCESS_INFORMATION ProcessInformation;
+            DPRINT1("CMD Run Command '%s'\n", Command);
+
+            Command[strlen(Command)-1] = 0;
+            
+            strcpy(CommandLine, "cmd.exe /c ");
+            strcat(CommandLine, Command);
+
+            ZeroMemory(&StartupInfo, sizeof(StartupInfo));
+            ZeroMemory(&ProcessInformation, sizeof(ProcessInformation));
+
+            StartupInfo.cb = sizeof(StartupInfo);
+
+            DosPrintCharacter('\n');
+
+            Result = CreateProcessA(NULL,
+                                    CommandLine,
+                                    NULL,
+                                    NULL,
+                                    TRUE,
+                                    0,
+                                    NULL,
+                                    NULL,
+                                    &StartupInfo,
+                                    &ProcessInformation);
+            if (Result)
+            {
+                DPRINT1("Command '%s' launched successfully\n");
+
+                /* Wait for process termination */
+                WaitForSingleObject(ProcessInformation.hProcess, INFINITE);
+
+                /* Get the exit code */
+                GetExitCodeProcess(ProcessInformation.hProcess, &dwExitCode);
+
+                /* Close handles */
+                CloseHandle(ProcessInformation.hThread);
+                CloseHandle(ProcessInformation.hProcess);
+            }
+            else
+            {
+                DPRINT1("Failed when launched command '%s'\n");
+                dwExitCode = GetLastError();
+            }
+            
+            DosPrintCharacter('\n');
+
+            setAL((UCHAR)dwExitCode);
+
+            break;
+        }
+
+        default:
+        {
+            DPRINT1("Unknown DOS CMD Interpreter BOP Function: 0x%02X\n",
FuncNum);
+            // setCF(1); // Disable, otherwise we enter an infinite loop
+            break;
+        }
+    }
 }
 
 VOID WINAPI DosInt20h(LPWORD Stack)