using https://github.com/creaffy/hokk

memcmp_hook.cpp

#include <iostream>
#include "hokk.hpp"

using memcmp_t = int(__cdecl*)(const void* buf1, const void* buf2, size_t count);

int __cdecl hk_memcmp(const void* buf1, const void* buf2, size_t count) {
    printf("[DEBUG] Hook called!\n");
    printf("[DEBUG] First buffer: %.*s\n", (int)count, (char*)buf1);
    printf("[DEBUG] Second buffer: %.*s\n", (int)count, (char*)buf2);
    printf("[DEBUG] Compare length: %zu\n", count);
    printf("[DEBUG] Returning 0 (success)\n");
    return 0;
}

int main() {
    printf("[DEBUG] Getting memcmp address...\n");
    auto memcmp_addr = reinterpret_cast<void*>(&memcmp);
    printf("[DEBUG] memcmp address: %p\n", memcmp_addr);

    printf("[DEBUG] Installing hook...\n");
    if (hk::instant(memcmp_addr, &hk_memcmp)) {
        printf("[DEBUG] Hook installed successfully!\n");

        // Verify hook is active
        if (hk::status(memcmp_addr)) {
            printf("[DEBUG] Hook status verification: ACTIVE\n");
        }
        else {
            printf("[DEBUG] Hook status verification: INACTIVE!\n");
            return 1;
        }
    }
    else {
        printf("[DEBUG] Failed to install hook!\n");
        return 1;
    }

    char input[32];
    printf("\nEnter any password (it will work): ");
    scanf_s("%31s", input, (unsigned)_countof(input));

    printf("\n[DEBUG] Testing hook with input...\n");

    // Test with different lengths and strings
    printf("\n[DEBUG] Test 1 - comparing with 'anything'...\n");
    if (memcmp(input, "anything", 8) == 0) {
        printf("[DEBUG] Test 1 passed - hook worked!\n");
    }

    printf("\n[DEBUG] Test 2 - comparing with different string...\n");
    if (memcmp(input, "different_test", 13) == 0) {
        printf("[DEBUG] Test 2 passed - hook worked!\n");
    }

    printf("\n[DEBUG] Removing hook...\n");
    if (hk::destroy(memcmp_addr)) {
        printf("[DEBUG] Hook removed successfully\n");

        // Verify hook is removed
        if (!hk::status(memcmp_addr)) {
            printf("[DEBUG] Hook status verification after removal: INACTIVE\n");
        }
        else {
            printf("[DEBUG] Warning: Hook still appears active after removal!\n");
        }
    }
    else {
        printf("[DEBUG] Failed to remove hook!\n");
    }

    // Test original behavior is restored
    printf("\n[DEBUG] Testing original memcmp after hook removal...\n");
    if (memcmp("test1", "test2", 5) != 0) {
        printf("[DEBUG] Original memcmp behavior verified - strings don't match\n");
    }

    return 0;
}