/**
 * @file trace.cpp
 * @author Sina Karvandi (sina@hyperdbg.org)
 * @brief !trace command
 * @details
 * @version 0.7
 * @date 2023-11-02
 *
 * @copyright This project is released under the GNU Public License v3.
 *
 */
#include "pch.h"

/**
 * @brief help of the !trace command
 *
 * @return VOID
 */
VOID
CommandTraceHelp()
{
    ShowMessages("!trace : traces the execution of user-mode/kernel-mode instructions.\n\n");

    ShowMessages("syntax : \t!trace [TraceType (string)] [pid ProcessId (hex)] [core CoreId (hex)] [imm IsImmediate (yesno)] "
                 "[sc EnableShortCircuiting (onoff)] [buffer PreAllocatedBuffer (hex)] [script { Script (string) }] "
                 "[asm condition { Condition (assembly/hex) }] [asm code { Code (assembly/hex) }] [output {OutputName (string)}]\n");

    ShowMessages("\n");
    ShowMessages("\t\te.g : !trace step-out\n");
    ShowMessages("\t\te.g : !trace step-in pid 1c0\n");
    ShowMessages("\t\te.g : !trace instrument-step core 2 pid 400\n");
    ShowMessages("\t\te.g : !trace instrument-step asm code { nop; nop; nop }\n");

    ShowMessages("\n");
    ShowMessages("valid trace types: \n");

    ShowMessages("\tstep-in : single step-in (regular)\n");
    ShowMessages("\tstep-out : single step-out (regular)\n");
    ShowMessages("\tinstrument-step : single step-in (instrumentation)\n");
}

/**
 * @brief !trace command handler
 *
 * @param CommandTokens
 * @param Command
 *
 * @return VOID
 */
VOID
CommandTrace(vector<CommandToken> CommandTokens, string Command)
{
    PDEBUGGER_GENERAL_EVENT_DETAIL     Event                 = NULL;
    PDEBUGGER_GENERAL_ACTION           ActionBreakToDebugger = NULL;
    PDEBUGGER_GENERAL_ACTION           ActionCustomCode      = NULL;
    PDEBUGGER_GENERAL_ACTION           ActionScript          = NULL;
    UINT32                             EventLength;
    UINT32                             ActionBreakToDebuggerLength = 0;
    UINT32                             ActionCustomCodeLength      = 0;
    UINT32                             ActionScriptLength          = 0;
    DEBUGGER_EVENT_PARSING_ERROR_CAUSE EventParsingErrorCause;
    BOOLEAN                            SetTraceType = FALSE;
    DEBUGGER_EVENT_TRACE_TYPE          TargetTrace  = DEBUGGER_EVENT_TRACE_TYPE_INVALID;

    //
    // Interpret and fill the general event and action fields
    //
    //
    if (!InterpretGeneralEventAndActionsFields(
            &CommandTokens,
            TRAP_EXECUTION_INSTRUCTION_TRACE,
            &Event,
            &EventLength,
            &ActionBreakToDebugger,
            &ActionBreakToDebuggerLength,
            &ActionCustomCode,
            &ActionCustomCodeLength,
            &ActionScript,
            &ActionScriptLength,
            &EventParsingErrorCause))
    {
        return;
    }

    //
    // Check for size
    //
    if (CommandTokens.size() > 2)
    {
        ShowMessages("incorrect use of the '%s'\n\n",
                     GetCaseSensitiveStringFromCommandToken(CommandTokens.at(0)).c_str());
        CommandTraceHelp();

        FreeEventsAndActionsMemory(Event, ActionBreakToDebugger, ActionCustomCode, ActionScript);
        return;
    }

    //
    // Interpret command specific details (if any)
    //
    for (auto Section : CommandTokens)
    {
        if (CompareLowerCaseStrings(Section, "!trace"))
        {
            continue;
        }
        else if ((CompareLowerCaseStrings(Section, "step-in") || CompareLowerCaseStrings(Section, "stepin") || CompareLowerCaseStrings(Section, "step")) && !SetTraceType)
        {
            TargetTrace  = DEBUGGER_EVENT_TRACE_TYPE_STEP_IN;
            SetTraceType = TRUE;
        }
        else if ((CompareLowerCaseStrings(Section, "step-out") || CompareLowerCaseStrings(Section, "stepout")) && !SetTraceType)
        {
            TargetTrace  = DEBUGGER_EVENT_TRACE_TYPE_STEP_OUT;
            SetTraceType = TRUE;
        }
        else if ((CompareLowerCaseStrings(Section, "step-instrument") || CompareLowerCaseStrings(Section, "instrument-step") ||
                  CompareLowerCaseStrings(Section, "instrumentstep") ||
                  CompareLowerCaseStrings(Section, "instrument-step-in")) &&
                 !SetTraceType)
        {
            TargetTrace  = DEBUGGER_EVENT_TRACE_TYPE_INSTRUMENTATION_STEP_IN;
            SetTraceType = TRUE;
        }
        else
        {
            //
            // Couldn't resolve or unknown parameter
            //
            ShowMessages("err, couldn't resolve error at '%s'\n\n",
                         GetCaseSensitiveStringFromCommandToken(Section).c_str());
            CommandTraceHelp();

            FreeEventsAndActionsMemory(Event, ActionBreakToDebugger, ActionCustomCode, ActionScript);
        }
    }

    //
    // Check if user specified the execution mode or not
    //
    if (!SetTraceType)
    {
        ShowMessages("please specify the trace type\n");

        FreeEventsAndActionsMemory(Event, ActionBreakToDebugger, ActionCustomCode, ActionScript);
        return;
    }

    //
    // Set the first parameter to the required trace type
    //
    Event->Options.OptionalParam1 = (UINT64)SetTraceType;

    //
    // Send the ioctl to the kernel for event registration
    //
    if (!SendEventToKernel(Event, EventLength))
    {
        //
        // There was an error, probably the handle was not initialized
        // we have to free the Action before exit, it is because, we
        // already freed the Event and string buffers
        //

        FreeEventsAndActionsMemory(Event, ActionBreakToDebugger, ActionCustomCode, ActionScript);
        return;
    }

    //
    // Add the event to the kernel
    //
    if (!RegisterActionToEvent(Event,
                               ActionBreakToDebugger,
                               ActionBreakToDebuggerLength,
                               ActionCustomCode,
                               ActionCustomCodeLength,
                               ActionScript,
                               ActionScriptLength))
    {
        //
        // There was an error
        //

        FreeEventsAndActionsMemory(Event, ActionBreakToDebugger, ActionCustomCode, ActionScript);
        return;
    }
}