/*
 * PROJECT:         shimdbg utility for WINE and ReactOS
 * LICENSE:         BSD - See COPYING.ARM in the top level directory
 * PURPOSE:         Test tool for SHIM engine caching.
 * PROGRAMMER:      Mark Jansen
 */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <ntndk.h>

void CallApphelp(APPHELPCACHESERVICECLASS Service,
                PAPPHELP_CACHE_SERVICE_LOOKUP CacheEntry)
{
    NTSTATUS Status = NtApphelpCacheControl(Service, CacheEntry);
    printf("NtApphelpCacheControl returned 0x%x\n", (unsigned int)Status);
}

HANDLE MapFile(char* filename, UNICODE_STRING* PathName, int MapIt)
{
    OBJECT_ATTRIBUTES LocalObjectAttributes;
    IO_STATUS_BLOCK IoStatusBlock;
    NTSTATUS Status;
    HANDLE FileHandle = NULL;
    RtlCreateUnicodeStringFromAsciiz(PathName, filename);
    if (MapIt)
    {
        InitializeObjectAttributes(&LocalObjectAttributes, PathName,
            OBJ_CASE_INSENSITIVE, NULL, NULL);
        Status = NtOpenFile(&FileHandle,
                    SYNCHRONIZE | FILE_READ_ATTRIBUTES | FILE_READ_DATA | FILE_EXECUTE,
                    &LocalObjectAttributes, &IoStatusBlock,
                    FILE_SHARE_READ | FILE_SHARE_DELETE,
                    FILE_SYNCHRONOUS_IO_NONALERT | FILE_NON_DIRECTORY_FILE);
        if (!NT_SUCCESS(Status))
        {
            printf("Failed opening the file, using a NULL handle\n");
            FileHandle = NULL;
        }
    }
    return FileHandle;
}

void CallApphelpWithImage(char* filename, int MapIt,
                        APPHELPCACHESERVICECLASS Service, char* ServiceName)
{
    UNICODE_STRING PathName = {0};
    APPHELP_CACHE_SERVICE_LOOKUP CacheEntry;

    HANDLE FileHandle = MapFile(filename, &PathName, MapIt);

    printf("Calling %s %s mapping\n", ServiceName, (MapIt ? "with" : "without"));

    RtlInitUnicodeString(&CacheEntry.ImageName, PathName.Buffer);
    CacheEntry.ImageHandle = FileHandle ? FileHandle : (HANDLE)-1;
    CallApphelp(Service, &CacheEntry);
    // we piggy-back on the PathName, so let the Cleanup take care of the string
    //RtlFreeUnicodeString(&CacheEntry.ImageName);

    if (FileHandle)
        NtClose(FileHandle);
    RtlFreeUnicodeString(&PathName);
}

int IsOpt(char* argv, const char* check)
{
    if( argv && (argv[0] == '-' || argv[0] == '/') ) {
        return !stricmp(argv + 1, check);
    }
    return 0;
}

int HandleImageArg(int argc, char* argv[], int* pn, char MapItChar,
                    APPHELPCACHESERVICECLASS Service, char* ServiceName)
{
    int n = *pn;
    if (n+1 < argc)
    {
        int MapIt = argv[n][1] == MapItChar;
        CallApphelpWithImage(argv[n+1], MapIt, Service, ServiceName);
        (*pn) += 1;
        return 0;
    }
    printf("Error: no image name specified\n");
    return 1;
}


UNICODE_STRING AppCompatCacheKey = RTL_CONSTANT_STRING(L"\\Registry\\MACHINE\\System\\CurrentControlSet\\Control\\Session Manager\\AppCompatCache");
OBJECT_ATTRIBUTES AppCompatKeyAttributes = RTL_CONSTANT_OBJECT_ATTRIBUTES(&AppCompatCacheKey, OBJ_CASE_INSENSITIVE);
UNICODE_STRING AppCompatCacheValue = RTL_CONSTANT_STRING(L"AppCompatCache");
#define REG_BINARY                  ( 3 )   // Free form binary


/* produce a hex dump, stolen from rdesktop.c */
void hexdump(unsigned char *p, unsigned int len)
{
    unsigned char *line = p;
    unsigned int i, thisline, offset = 0;

    while (offset < len)
    {
        printf("%04x ", offset);
        thisline = len - offset;
        if (thisline > 16)
            thisline = 16;

        for (i = 0; i < thisline; i++)
            printf("%02x ", line[i]);

        for (; i < 16; i++)
            printf("   ");

        for (i = 0; i < thisline; i++)
            printf("%c", (line[i] >= 0x20 && line[i] < 0x7f) ? line[i] : '.');

        printf("\n");
        offset += thisline;
        line += thisline;
    }
}

void DumpRegistryData(int IncludeDump)
{
    HANDLE KeyHandle;
    NTSTATUS Status;
    KEY_VALUE_PARTIAL_INFORMATION KeyValueObject;
    PKEY_VALUE_PARTIAL_INFORMATION KeyValueInformation = &KeyValueObject;
    ULONG KeyInfoSize, ResultSize;

    printf("Dumping AppCompatCache registry key\n");

    Status = NtOpenKey(&KeyHandle, KEY_QUERY_VALUE, &AppCompatKeyAttributes);

    Status = NtQueryValueKey(KeyHandle, &AppCompatCacheValue,
                KeyValuePartialInformation, KeyValueInformation,
                sizeof(KeyValueObject), &ResultSize);

    if (Status == STATUS_BUFFER_OVERFLOW)
    {
        KeyInfoSize = sizeof(KEY_VALUE_PARTIAL_INFORMATION) + KeyValueInformation->DataLength;
        KeyValueInformation = malloc(KeyInfoSize);
        if (KeyValueInformation != NULL)
        {
            Status = NtQueryValueKey(KeyHandle, &AppCompatCacheValue,
                        KeyValuePartialInformation, KeyValueInformation,
                        KeyInfoSize, &ResultSize);
        }
    }

    if (NT_SUCCESS(Status) && KeyValueInformation->Type == REG_BINARY)
    {
        ULONG crc;
        if (IncludeDump)
            hexdump(KeyValueInformation->Data, KeyValueInformation->DataLength);
        crc = RtlComputeCrc32(0, KeyValueInformation->Data, KeyValueInformation->DataLength);
        printf("Len: %lu, Crc: 0x%lx\n", KeyValueInformation->DataLength, crc);
    }
    else
    {
        printf("Failed reading AppCompatCache from registry (0x%lx)\n", Status);
    }

    if (KeyValueInformation != &KeyValueObject)
        free(KeyValueInformation);

    if (KeyHandle)
        NtClose(KeyHandle);
}

int _getch();

int main(int argc, char* argv[])
{
    int n, unhandled = 0, keepopen = 0;

    for (n = 1; n < argc; ++n)
    {
        char* arg = argv[n];
        if (IsOpt(arg, "d"))
        {
            printf("Calling ApphelpCacheServiceDump\n");
            CallApphelp(ApphelpCacheServiceDump, NULL);
            unhandled = 0;
        }
        else if (IsOpt(arg, "h"))
        {
            DumpRegistryData(arg[1] == 'h');
            unhandled = 0;
        }
        else if (IsOpt(arg, "f"))
        {
            printf("Calling ApphelpCacheServiceFlush\n");
            CallApphelp(ApphelpCacheServiceFlush, NULL);
            unhandled = 0;
        }
        else if (IsOpt(arg, "z"))
        {
            printf("Calling ApphelpDBGReadRegistry\n");
            CallApphelp(ApphelpDBGReadRegistry, NULL);
            unhandled = 0;
        }
        else if (IsOpt(arg, "x"))
        {
            printf("Calling ApphelpDBGWriteRegistry\n");
            CallApphelp(ApphelpDBGWriteRegistry, NULL);
            unhandled = 0;
        }
        else if (IsOpt(arg, "l"))
        {
            unhandled |= HandleImageArg(argc, argv, &n, 'l',
                        ApphelpCacheServiceLookup, "ApphelpCacheServiceLookup");
        }
        else if (IsOpt(arg, "u"))
        {
            unhandled |= HandleImageArg(argc, argv, &n, 'u',
                        ApphelpCacheServiceUpdate, "ApphelpCacheServiceUpdate");
        }
        else if (IsOpt(arg, "r"))
        {
            unhandled |= HandleImageArg(argc, argv, &n, 'r',
                        ApphelpCacheServiceRemove, "ApphelpCacheServiceRemove");
        }
        else if (IsOpt(arg, "k"))
        {
            keepopen = 1;
        }
        else
        {
            unhandled = 1;
        }
    }
    if (unhandled || argc == 1)
    {
        printf("Usage: %s [-d|-z|-x|-h|-H|-f|-[l|L] <image>|-[u|U] <image>|-[r|R] <image>|-k]\n", argv[0]);
        printf("           -d: Dump shim cache over debug output\n");
        printf("           -z: DEBUG Read shim cache from registry\n");
        printf("           -x: DEBUG Write shim cache to registry\n");
        printf("           -h: Hexdump shim registry key\n");
        printf("           -H: Crc + Length from shim registry key only\n");
        printf("           -f: Flush (clear) the shim cache\n");
        printf("           -l: Lookup <image> in the shim cache\n");
        printf("           -L: Lookup <image> in the shim cache without mapping it\n");
        printf("           -u: Update (insert) <image> in the shim cache\n");
        printf("           -U: Update (insert) <image> in the shim cache without mapping it\n");
        printf("           -r: Remove <image> from the shim cache\n");
        printf("           -R: Remove <image> from the shim cache without mapping it\n");
        printf("           -k: Keep the console open\n");
    }
    if (keepopen)
    {
        _getch();
    }
    return unhandled;
}