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/**
 * This file is part of Hercules.
 * http://herc.ws - http://github.com/HerculesWS/Hercules
 *
 * Copyright (C) 2012-2015  Hercules Dev Team
 * Copyright (C)  Athena Dev Teams
 *
 * Hercules is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#define HERCULES_CORE
 
#include "ipban.h"
 
#include "login/login.h"
#include "login/loginlog.h"
#include "common/cbasetypes.h"
#include "common/nullpo.h"
#include "common/sql.h"
#include "common/strlib.h"
#include "common/timer.h"
#include "common/socket.h"
 
void gepard_update_last_unique_id(int account_id, uint32 unique_id)
{
    if (SQL_SUCCESS != SQL->Query(sql_handle, "UPDATE `login` SET `last_unique_id`= '%u' WHERE `account_id` = '%d'", unique_id, account_id))
    {
        Sql_ShowDebug(sql_handle);
    }
    else if (SQL_SUCCESS == SQL->NextRow(sql_handle))
    {
        Sql_ShowDebug(sql_handle);
    }
 
    SQL->FreeResult(sql_handle);
}
 
bool gepard_check_unique_id(int fd, uint32 unique_id)
{
    if (SQL_SUCCESS != SQL->Query(sql_handle, "SELECT `unban_time`, `reason` FROM `gepard_block` WHERE `unique_id` = '%u'", unique_id))
    {
        Sql_ShowDebug(sql_handle);
        gepard_send_info(fd, GEPARD_INFO_BANNED, "Tell administrator about SQL problem.");
    }
    else if (SQL_SUCCESS == SQL->NextRow(sql_handle))
    {
        char* data;
        struct tm unblock_tm;
        time_t time_unban, time_server;
        int year, month, day, hour, min, sec;
        char reason_str[GEPARD_REASON_LENGTH];
        char unban_time_str[GEPARD_TIME_STR_LENGTH];
 
        memset((void*)&unblock_tm, 0, sizeof(unblock_tm));
 
        SQL->GetData(sql_handle,  0, &data, NULL);
        safestrncpy(unban_time_str, data, sizeof(unban_time_str));
 
        sscanf(unban_time_str, "%d-%d-%d %d:%d:%d", &year, &month, &day, &hour, &min, &sec);
 
        unblock_tm.tm_year = year - 1900;
        unblock_tm.tm_mon = month - 1;
        unblock_tm.tm_mday = day;
        unblock_tm.tm_hour = hour;
        unblock_tm.tm_min = min;
        unblock_tm.tm_sec = sec;
 
        time_unban = mktime(&unblock_tm);
        time(&time_server);
 
        if (time_server <= time_unban)
        {
            char message_info[200];
 
            SQL->GetData(sql_handle,  1, &data, NULL);
            safestrncpy(reason_str, data, sizeof(reason_str));
 
            safesnprintf(message_info, sizeof(message_info), "Unique ID has been banned!\r\rDate of unban:  %s\r\rUnique id: %u\r\rReason: %s", unban_time_str, unique_id, reason_str);
 
            sockt->session[fd]->gepard_info.is_init_ack_received = false;
 
            gepard_send_info(fd, GEPARD_INFO_BANNED, message_info);
        }
        else if (SQL_ERROR == SQL->Query(sql_handle, "DELETE FROM `gepard_block` WHERE `unique_id` = '%u'", unique_id))
        {
            Sql_ShowDebug(sql_handle);
        }
    }
 
    SQL->FreeResult(sql_handle);
 
    return false;
}
 
#include <stdlib.h>
 
// global sql settings
static char   global_db_hostname[32] = "127.0.0.1";
static uint16 global_db_port = 3306;
static char   global_db_username[32] = "ragnarok";
static char   global_db_password[100] = "ragnarok";
static char   global_db_database[32] = "ragnarok";
static char   global_codepage[32] = "";
// local sql settings
static char   ipban_db_hostname[32] = "";
static uint16 ipban_db_port = 0;
static char   ipban_db_username[32] = "";
static char   ipban_db_password[100] = "";
static char   ipban_db_database[32] = "";
static char   ipban_codepage[32] = "";
static char   ipban_table[32] = "ipbanlist";
 
// globals
static struct Sql *sql_handle = NULL;
static int cleanup_timer_id = INVALID_TIMER;
static bool ipban_inited = false;
 
int ipban_cleanup(int tid, int64 tick, int id, intptr_t data);
 
 
// initialize
void ipban_init(void)
{
    const char* username;
    const char* password;
    const char* hostname;
    uint16      port;
    const char* database;
    const char* codepage;
 
    ipban_inited = true;
 
    if (!login->config->ipban)
        return;// ipban disabled
 
    if( ipban_db_hostname[0] != '\0' )
    {// local settings
        username = ipban_db_username;
        password = ipban_db_password;
        hostname = ipban_db_hostname;
        port     = ipban_db_port;
        database = ipban_db_database;
        codepage = ipban_codepage;
    }
    else
    {// global settings
        username = global_db_username;
        password = global_db_password;
        hostname = global_db_hostname;
        port     = global_db_port;
        database = global_db_database;
        codepage = global_codepage;
    }
 
    // establish connections
    sql_handle = SQL->Malloc();
    if( SQL_ERROR == SQL->Connect(sql_handle, username, password, hostname, port, database) )
    {
        Sql_ShowDebug(sql_handle);
        SQL->Free(sql_handle);
        exit(EXIT_FAILURE);
    }
    if( codepage[0] != '\0' && SQL_ERROR == SQL->SetEncoding(sql_handle, codepage) )
        Sql_ShowDebug(sql_handle);
 
    if (login->config->ipban_cleanup_interval > 0)
    { // set up periodic cleanup of connection history and active bans
        timer->add_func_list(ipban_cleanup, "ipban_cleanup");
        cleanup_timer_id = timer->add_interval(timer->gettick()+10, ipban_cleanup, 0, 0, login->config->ipban_cleanup_interval*1000);
    } else // make sure it gets cleaned up on login-server start regardless of interval-based cleanups
        ipban_cleanup(0,0,0,0);
}
 
// finalize
void ipban_final(void)
{
    if (!login->config->ipban)
        return;// ipban disabled
 
    if (login->config->ipban_cleanup_interval > 0)
        // release data
        timer->delete(cleanup_timer_id, ipban_cleanup);
 
    ipban_cleanup(0,0,0,0); // always clean up on login-server stop
 
    // close connections
    SQL->Free(sql_handle);
    sql_handle = NULL;
}
 
// load configuration options
bool ipban_config_read(const char* key, const char* value)
{
    const char* signature;
 
    nullpo_ret(key);
    nullpo_ret(value);
    if( ipban_inited )
        return false;// settings can only be changed before init
 
    signature = "sql.";
    if( strncmpi(key, signature, strlen(signature)) == 0 )
    {
        key += strlen(signature);
        if( strcmpi(key, "db_hostname") == 0 )
            safestrncpy(global_db_hostname, value, sizeof(global_db_hostname));
        else
        if( strcmpi(key, "db_port") == 0 )
            global_db_port = (uint16)strtoul(value, NULL, 10);
        else
        if( strcmpi(key, "db_username") == 0 )
            safestrncpy(global_db_username, value, sizeof(global_db_username));
        else
        if( strcmpi(key, "db_password") == 0 )
            safestrncpy(global_db_password, value, sizeof(global_db_password));
        else
        if( strcmpi(key, "db_database") == 0 )
            safestrncpy(global_db_database, value, sizeof(global_db_database));
        else
        if( strcmpi(key, "codepage") == 0 )
            safestrncpy(global_codepage, value, sizeof(global_codepage));
        else
            return false;// not found
        return true;
    }
 
    signature = "ipban.sql.";
    if( strncmpi(key, signature, strlen(signature)) == 0 )
    {
        key += strlen(signature);
        if( strcmpi(key, "db_hostname") == 0 )
            safestrncpy(ipban_db_hostname, value, sizeof(ipban_db_hostname));
        else
        if( strcmpi(key, "db_port") == 0 )
            ipban_db_port = (uint16)strtoul(value, NULL, 10);
        else
        if( strcmpi(key, "db_username") == 0 )
            safestrncpy(ipban_db_username, value, sizeof(ipban_db_username));
        else
        if( strcmpi(key, "db_password") == 0 )
            safestrncpy(ipban_db_password, value, sizeof(ipban_db_password));
        else
        if( strcmpi(key, "db_database") == 0 )
            safestrncpy(ipban_db_database, value, sizeof(ipban_db_database));
        else
        if( strcmpi(key, "codepage") == 0 )
            safestrncpy(ipban_codepage, value, sizeof(ipban_codepage));
        else
        if( strcmpi(key, "ipban_table") == 0 )
            safestrncpy(ipban_table, value, sizeof(ipban_table));
        else
            return false;// not found
        return true;
    }
 
    signature = "ipban.";
    if( strncmpi(key, signature, strlen(signature)) == 0 )
    {
        key += strlen(signature);
        if( strcmpi(key, "enable") == 0 )
            login->config->ipban = (bool)config_switch(value);
        else
        if( strcmpi(key, "dynamic_pass_failure_ban") == 0 )
            login->config->dynamic_pass_failure_ban = (bool)config_switch(value);
        else
        if( strcmpi(key, "dynamic_pass_failure_ban_interval") == 0 )
            login->config->dynamic_pass_failure_ban_interval = atoi(value);
        else
        if( strcmpi(key, "dynamic_pass_failure_ban_limit") == 0 )
            login->config->dynamic_pass_failure_ban_limit = atoi(value);
        else
        if( strcmpi(key, "dynamic_pass_failure_ban_duration") == 0 )
            login->config->dynamic_pass_failure_ban_duration = atoi(value);
        else
            return false;// not found
        return true;
    }
 
    return false;// not found
}
 
// check ip against active bans list
bool ipban_check(uint32 ip)
{
    uint8* p = (uint8*)&ip;
    char* data = NULL;
    int matches;
 
    if (!login->config->ipban)
        return false;// ipban disabled
 
    if( SQL_ERROR == SQL->Query(sql_handle, "SELECT count(*) FROM `%s` WHERE `rtime` > NOW() AND (`list` = '%u.*.*.*' OR `list` = '%u.%u.*.*' OR `list` = '%u.%u.%u.*' OR `list` = '%u.%u.%u.%u')",
        ipban_table, p[3], p[3], p[2], p[3], p[2], p[1], p[3], p[2], p[1], p[0]) )
    {
        Sql_ShowDebug(sql_handle);
        // close connection because we can't verify their connectivity.
        return true;
    }
 
    if( SQL_SUCCESS != SQL->NextRow(sql_handle) )
        return false;
 
    SQL->GetData(sql_handle, 0, &data, NULL);
    matches = atoi(data);
    SQL->FreeResult(sql_handle);
 
    return( matches > 0 );
}
 
// log failed attempt
void ipban_log(uint32 ip)
{
    unsigned long failures;
 
    if (!login->config->ipban)
        return;// ipban disabled
 
    failures = loginlog_failedattempts(ip, login->config->dynamic_pass_failure_ban_interval);// how many times failed account? in one ip.
 
    // if over the limit, add a temporary ban entry
    if (failures >= login->config->dynamic_pass_failure_ban_limit)
    {
        uint8* p = (uint8*)&ip;
        if (SQL_ERROR == SQL->Query(sql_handle, "INSERT INTO `%s`(`list`,`btime`,`rtime`,`reason`) VALUES ('%u.%u.%u.*', NOW() , NOW() +  INTERVAL %u MINUTE ,'Password error ban')",
            ipban_table, p[3], p[2], p[1], login->config->dynamic_pass_failure_ban_duration))
        {
            Sql_ShowDebug(sql_handle);
        }
    }
}
 
// remove expired bans
int ipban_cleanup(int tid, int64 tick, int id, intptr_t data) {
    if (!login->config->ipban)
        return 0;// ipban disabled
 
    if( SQL_ERROR == SQL->Query(sql_handle, "DELETE FROM `%s` WHERE `rtime` <= NOW()", ipban_table) )
        Sql_ShowDebug(sql_handle);
 
    return 0;
}
 
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