#include <amxmisc>

#define VERSION "2.2"

new g_filenameprecached[64], test_opengl32[33], precache_opengl32[64][64]
new g_num_opengl32 = 0
new g_configsdir[64], md5buffer[34]

public plugin_init()
{
    register_plugin("CSF OpenGL32", VERSION, "CSF")
    
    server_cmd("mp_consistency 1")

    if(file_exists("..\opengl32.dll"))
    {
        md5_file("..\opengl32.dll", md5buffer)
    }
    server_print("^n    [CSF-AC] OpenGL32 * FileName <%s>", g_filenameprecached)
    server_print("^n    [CSF-AC] OpenGL32 * MD5 <%s>", md5buffer)
}

public plugin_precache()
{
    get_configsdir(g_configsdir, 63)
    checkfiles_opengl32()
    setfile_opengl32()
    force_unmodified(force_exactfile, {0,0,0}, {0,0,0}, "../opengl32.dll")
}

public setfile_opengl32()
{
    if(g_num_opengl32==0)
    {
        server_print("^t[CSF-AC] OpenGL32 * Not Found Files")
        return PLUGIN_HANDLED
    }
    new len, text[64], next_file[64], check, notagain, frmError[64], filecfg[128]
    format(filecfg, 127, "%s/csf_anticheat/csf_ac_opengl32_lastdll.cfg", g_configsdir)
    if(file_exists(filecfg))
        read_file(filecfg, 0, text, 63, len)
    else
        write_file(filecfg, "", 0)
    
    for(new i;i<=g_num_opengl32;i++)
    {
        if(check == 1 && notagain == 0)
        {
            notagain = 1
            format(next_file, 63, "%s", precache_opengl32[i])
        }
        if(equal(text, precache_opengl32[i]))
        {
            check = 1
        }
    }
    
    if(file_exists("..\opengl32.dll"))
    {
        delete_file("..\opengl32.dll")
    }
    
    if(strlen(next_file) < 3 || check == 0)
    {
        format(g_filenameprecached, 63, "%s", precache_opengl32[1])
        file_copy(precache_opengl32[1], "..\opengl32.dll", frmError, 63, true)
        format(next_file, 63, "%s", precache_opengl32[1])
    }
    else
    {
        format(g_filenameprecached, 63, "%s", next_file)
        file_copy(next_file, "..\opengl32.dll", frmError, 63, true)
    }
    
    if(strlen(frmError) > 0)
        server_print("^t[CSF-AC] OpenGL32 * %s", frmError)
    
    write_file(filecfg, next_file, 0)
    
    return PLUGIN_HANDLED
}

public checkfiles_opengl32()
{
    new filename[32], len, md5buffer[34], flieopengl32[64], num
    new pDir = open_dir("..\opengl32\", filename, 31)
    if(pDir) {
        do{
            len = strlen(filename)
            if(len > 4)
            {
                if(equal(filename[len-4], ".dll"))
                {
                    num++
                    format(flieopengl32, 63, "..\opengl32\%s", filename)
                    precache_opengl32[num] = flieopengl32
                    md5_file(flieopengl32, md5buffer)
                }
            }
        }
        while(next_file(pDir, filename, 31))
        close_dir(pDir)
    }
    g_num_opengl32 = num
}

public inconsistent_file(id, const filename[], reason[64])
{
    if(equal(filename, "../opengl32.dll"))
    {
        test_opengl32[id] = 1
        return PLUGIN_HANDLED
    }
    return PLUGIN_CONTINUE
}

public client_connect(id)
{
    test_opengl32[id] = 0
    if(task_exists(id+443))    remove_task(id+443)
}

public client_putinserver(id)
{
    if(!is_user_bot(id) && !is_user_hltv(id))
    {
        set_task(10.0, "check_opengl32", id+443)
    }
    return PLUGIN_HANDLED
}

public client_disconnect(id)
{
    test_opengl32[id] = 0
    if(task_exists(id+443))    remove_task(id+443)

    return PLUGIN_HANDLED
}

public check_opengl32(id)
{
    id-=443
    if(test_opengl32[id]==0)
    {
        new szName[32], szAuthid[32], szIP[16]
        get_user_name(id, szName, charsmax(szName))
        get_user_authid(id, szAuthid, charsmax(szAuthid))
        get_user_ip(id, szIP, charsmax(szIP), 1)

        server_cmd("amx_ban 0 %s ^"[CSF-AC] OpenGL32 Hack Detected^"", szAuthid)

        client_print(0, print_chat, "[CSF-AC] OpenGL32 Hack Detected with %s.", szName)
        log_to_file("csf_opengl32.log", "|%-30s|%-15s|%-22s|%s", szName, szIP, szAuthid, g_filenameprecached)
    }
    return PLUGIN_HANDLED
}

stock bool:file_copy(SOURCE[], TARGET[], error[], const ERRORLEN, const bool:REPLACE_TARGET = false) {
    if (!file_exists(SOURCE)) {
        format(error, ERRORLEN, "File copy error: Source ^"%s^" doesn't exist!", SOURCE)
        return false
    }
    if (!REPLACE_TARGET && file_exists(TARGET)) {
        format(error, ERRORLEN, "File copy error: Target ^"%s^" exists!", TARGET)
        return false
    }
    
    new source = fopen(SOURCE, "rb")
    if (!source) {
        format(error, ERRORLEN, "File copy error: Opening source ^"%s^" failed!", SOURCE)
        return false
    }
    
    new target = fopen(TARGET, "wb")
    if (!target) {
        format(error, ERRORLEN, "File copy error: Opening target ^"%s^" failed!", TARGET)
        fclose(source)
        return false
    }
    
    for (new buffer, eof = feof(source); !eof; !eof && fputc(target, buffer)) {
        buffer = fgetc(source)
        eof = feof(source)
    }
    fclose(source)
    fclose(target)
    
    return true
}