/**
* This file is part of Hercules.
* http://herc.ws - http://github.com/HerculesWS/Hercules
*
* Copyright (C) 2016 Hercules Dev Team
*
* 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 "lclif.p.h"
#include "login/ipban.h"
#include "login/login.h"
#include "login/loginlog.h"
#include "common/HPM.h"
#include "common/cbasetypes.h"
#include "common/db.h"
#include "common/md5calc.h"
#include "common/memmgr.h"
#include "common/mmo.h"
#include "common/nullpo.h"
#include "common/random.h"
#include "common/showmsg.h"
#include "common/socket.h"
#include "common/strlib.h"
#include "common/utils.h"
/** @file
* Implementation of the login client interface.
*/
static struct lclif_interface lclif_s;
static struct lclif_interface_private lclif_p;
static struct lclif_interface_dbs lclif_dbs;
struct lclif_interface *lclif;
/// @copydoc lclif_interface::connection_error()
static void lclif_connection_error(int fd, uint8 error)
{
struct packet_SC_NOTIFY_BAN *packet = NULL;
WFIFOHEAD(fd, sizeof(*packet));
packet = WP2PTR(fd);
packet->packet_id = PACKET_ID_SC_NOTIFY_BAN;
packet->error_code = error;
WFIFOSET(fd, sizeof(*packet));
}
/// @copydoc lclif_interface_private::parse_CA_CONNECT_INFO_CHANGED()
static enum parsefunc_rcode lclif_parse_CA_CONNECT_INFO_CHANGED(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_CONNECT_INFO_CHANGED(int fd, struct login_session_data *sd)
{
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_EXE_HASHCHECK()
static enum parsefunc_rcode lclif_parse_CA_EXE_HASHCHECK(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_EXE_HASHCHECK(int fd, struct login_session_data *sd)
{
const struct packet_CA_EXE_HASHCHECK *packet = RP2PTR(fd);
sd->has_client_hash = 1;
memcpy(sd->client_hash, packet->hash_value, 16);
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_LOGIN()
static enum parsefunc_rcode lclif_parse_CA_LOGIN(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_LOGIN(int fd, struct login_session_data *sd)
{
const struct packet_CA_LOGIN *packet = RP2PTR(fd);
sd->version = packet->version;
sd->clienttype = packet->clienttype;
safestrncpy(sd->userid, packet->id, NAME_LENGTH);
safestrncpy(sd->passwd, packet->password, PASSWD_LEN);
if (login->config->use_md5_passwds)
md5->string(sd->passwd, sd->passwd);
sd->passwdenc = PWENC_NONE;
login->client_login(fd, sd);
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_LOGIN2()
static enum parsefunc_rcode lclif_parse_CA_LOGIN2(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_LOGIN2(int fd, struct login_session_data *sd)
{
const struct packet_CA_LOGIN2 *packet = RP2PTR(fd);
sd->version = packet->version;
sd->clienttype = packet->clienttype;
safestrncpy(sd->userid, packet->id, NAME_LENGTH);
bin2hex(sd->passwd, packet->password_md5, 16);
sd->passwdenc = PASSWORDENC;
login->client_login(fd, sd);
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_LOGIN3()
static enum parsefunc_rcode lclif_parse_CA_LOGIN3(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_LOGIN3(int fd, struct login_session_data *sd)
{
const struct packet_CA_LOGIN3 *packet = RP2PTR(fd);
sd->version = packet->version;
sd->clienttype = packet->clienttype;
/* unused */
/* sd->clientinfo = packet->clientinfo; */
safestrncpy(sd->userid, packet->id, NAME_LENGTH);
bin2hex(sd->passwd, packet->password_md5, 16);
sd->passwdenc = PASSWORDENC;
login->client_login(fd, sd);
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_LOGIN4()
static enum parsefunc_rcode lclif_parse_CA_LOGIN4(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_LOGIN4(int fd, struct login_session_data *sd)
{
const struct packet_CA_LOGIN4 *packet = RP2PTR(fd);
sd->version = packet->version;
sd->clienttype = packet->clienttype;
/* unused */
/* safestrncpy(sd->mac_address, packet->mac_address, sizeof(sd->mac_address)); */
safestrncpy(sd->userid, packet->id, NAME_LENGTH);
bin2hex(sd->passwd, packet->password_md5, 16);
sd->passwdenc = PASSWORDENC;
login->client_login(fd, sd);
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_LOGIN_PCBANG()
static enum parsefunc_rcode lclif_parse_CA_LOGIN_PCBANG(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_LOGIN_PCBANG(int fd, struct login_session_data *sd)
{
const struct packet_CA_LOGIN_PCBANG *packet = RP2PTR(fd);
sd->version = packet->version;
sd->clienttype = packet->clienttype;
/* unused */
/* safestrncpy(sd->ip, packet->ip, sizeof(sd->ip)); */
/* safestrncpy(sd->mac_address, packet->mac_address, sizeof(sd->mac_address)); */
safestrncpy(sd->userid, packet->id, NAME_LENGTH);
safestrncpy(sd->passwd, packet->password, PASSWD_LEN);
if (login->config->use_md5_passwds)
md5->string(sd->passwd, sd->passwd);
sd->passwdenc = PWENC_NONE;
login->client_login(fd, sd);
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_LOGIN_HAN()
static enum parsefunc_rcode lclif_parse_CA_LOGIN_HAN(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_LOGIN_HAN(int fd, struct login_session_data *sd)
{
const struct packet_CA_LOGIN_HAN *packet = RP2PTR(fd);
sd->version = packet->version;
sd->clienttype = packet->clienttype;
/* unused */
/* safestrncpy(sd->ip, packet->ip, sizeof(sd->ip)); */
/* safestrncpy(sd->mac_address, packet->mac_address, sizeof(sd->mac_address)); */
/* sd->ishan = packet->is_han_game_user; */
safestrncpy(sd->userid, packet->id, NAME_LENGTH);
safestrncpy(sd->passwd, packet->password, PASSWD_LEN);
if (login->config->use_md5_passwds)
md5->string(sd->passwd, sd->passwd);
sd->passwdenc = PWENC_NONE;
login->client_login(fd, sd);
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_SSO_LOGIN_REQ()
static enum parsefunc_rcode lclif_parse_CA_SSO_LOGIN_REQ(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_SSO_LOGIN_REQ(int fd, struct login_session_data *sd)
{
const struct packet_CA_SSO_LOGIN_REQ *packet = RP2PTR(fd);
int tokenlen = (int)RFIFOREST(fd) - (int)sizeof(*packet);
if (tokenlen > PASSWD_LEN || tokenlen < 1) {
ShowError("packet_CA_SSO_LOGIN_REQ: Token length is not between allowed password length, kicking player ('%s')", packet->id);
sockt->eof(fd);
return PACKET_VALID;
}
sd->clienttype = packet->clienttype;
sd->version = packet->version;
safestrncpy(sd->userid, packet->id, NAME_LENGTH);
safestrncpy(sd->passwd, packet->t1, min(tokenlen + 1, PASSWD_LEN)); // Variable-length field, don't copy more than necessary
if (login->config->use_md5_passwds)
md5->string(sd->passwd, sd->passwd);
sd->passwdenc = PWENC_NONE;
login->client_login(fd, sd);
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_LOGIN_OTP()
static enum parsefunc_rcode lclif_parse_CA_LOGIN_OTP(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_LOGIN_OTP(int fd, struct login_session_data *sd)
{
//const struct packet_CA_LOGIN_OTP *packet = RP2PTR(fd);
login->client_login_otp(fd, sd);
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_REQ_HASH()
static enum parsefunc_rcode lclif_parse_CA_REQ_HASH(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_REQ_HASH(int fd, struct login_session_data *sd)
{
memset(sd->md5key, '\0', sizeof(sd->md5key));
sd->md5keylen = (uint16)(12 + rnd() % 4);
md5->salt(sd->md5keylen, sd->md5key);
lclif->coding_key(fd, sd);
return PACKET_VALID;
}
/// @copydoc lclif_interface_private::parse_CA_CHARSERVERCONNECT()
static enum parsefunc_rcode lclif_parse_CA_CHARSERVERCONNECT(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static enum parsefunc_rcode lclif_parse_CA_CHARSERVERCONNECT(int fd, struct login_session_data *sd)
{
char ip[16];
uint32 ipl = sockt->session[fd]->client_addr;
sockt->ip2str(ipl, ip);
login->parse_request_connection(fd, sd, ip, ipl);
return PACKET_STOPPARSE;
}
/// @copydoc lclif_interface::server_list()
static bool lclif_send_server_list(struct login_session_data *sd)
{
int server_num = 0, i, n, length;
uint32 ip;
struct packet_AC_ACCEPT_LOGIN *packet = NULL;
for (i = 0; i < ARRAYLENGTH(login->dbs->server); ++i) {
if (sockt->session_is_active(login->dbs->server[i].fd))
server_num++;
}
if (server_num == 0)
return false;
length = sizeof(*packet) + sizeof(packet->server_list[0]) * server_num;
ip = sockt->session[sd->fd]->client_addr;
// Allocate the packet
WFIFOHEAD(sd->fd, length);
packet = WP2PTR(sd->fd);
#if PACKETVER < 20170315
packet->packet_id = PACKET_ID_AC_ACCEPT_LOGIN;
#else
packet->packet_id = PACKET_ID_AC_ACCEPT_LOGIN2;
#endif
packet->packet_len = length;
packet->auth_code = sd->login_id1;
packet->aid = sd->account_id;
packet->user_level = sd->login_id2;
packet->last_login_ip = 0; // Not used anymore
memset(packet->last_login_time, '\0', sizeof(packet->last_login_time)); // Not used anymore
packet->sex = sex_str2num(sd->sex);
for (i = 0, n = 0; i < ARRAYLENGTH(login->dbs->server); ++i) {
uint32 subnet_char_ip;
if (!sockt->session_is_valid(login->dbs->server[i].fd))
continue;
subnet_char_ip = login->lan_subnet_check(ip);
packet->server_list[n].ip = htonl((subnet_char_ip) ? subnet_char_ip : login->dbs->server[i].ip);
packet->server_list[n].port = sockt->ntows(htons(login->dbs->server[i].port)); // [!] LE byte order here [!]
safestrncpy(packet->server_list[n].name, login->dbs->server[i].name, 20);
packet->server_list[n].usercount = login->convert_users_to_colors(login->dbs->server[i].users);
if (login->dbs->server[i].type == CST_PAYING && sd->expiration_time > time(NULL))
packet->server_list[n].property = CST_NORMAL;
else
packet->server_list[n].property = login->dbs->server[i].type;
packet->server_list[n].state = login->dbs->server[i].new_;
++n;
}
WFIFOSET(sd->fd, length);
return true;
}
/// @copydoc lclif_interface::auth_failed()
static void lclif_send_auth_failed(int fd, time_t ban, uint32 error)
{
#if PACKETVER >= 20180627
struct packet_AC_REFUSE_LOGIN_R2 *packet = NULL;
int packet_id = PACKET_ID_AC_REFUSE_LOGIN_R3;
#elif PACKETVER >= 20101123
struct packet_AC_REFUSE_LOGIN_R2 *packet = NULL;
int packet_id = PACKET_ID_AC_REFUSE_LOGIN_R2;
#else
struct packet_AC_REFUSE_LOGIN *packet = NULL;
int packet_id = PACKET_ID_AC_REFUSE_LOGIN;
#endif
WFIFOHEAD(fd, sizeof(*packet));
packet = WP2PTR(fd);
packet->packet_id = packet_id;
packet->error_code = error;
if (error == 6)
timestamp2string(packet->block_date, sizeof(packet->block_date), ban, login->config->date_format);
else
memset(packet->block_date, '\0', sizeof(packet->block_date));
WFIFOSET(fd, sizeof(*packet));
}
/// @copydoc lclif_interface::login_error()
static void lclif_send_login_error(int fd, uint8 error)
{
struct packet_AC_REFUSE_LOGIN *packet = NULL;
WFIFOHEAD(fd, sizeof(*packet));
packet = WP2PTR(fd);
packet->packet_id = PACKET_ID_AC_REFUSE_LOGIN;
packet->error_code = error;
memset(packet->block_date, '\0', sizeof(packet->block_date));
WFIFOSET(fd, sizeof(*packet));
}
/// @copydoc lclif_interface::coding_key()
static void lclif_send_coding_key(int fd, struct login_session_data *sd) __attribute__((nonnull (2)));
static void lclif_send_coding_key(int fd, struct login_session_data *sd)
{
struct packet_AC_ACK_HASH *packet = NULL;
int16 size = sizeof(*packet) + sd->md5keylen;
WFIFOHEAD(fd, size);
packet = WP2PTR(fd);
packet->packet_id = PACKET_ID_AC_ACK_HASH;
packet->packet_len = size;
memcpy(packet->secret, sd->md5key, sd->md5keylen);
WFIFOSET(fd, size);
}
/// @copydoc lclif_interface::parse()
static int lclif_parse(int fd)
{
struct login_session_data *sd = NULL;
int i;
char ip[16];
uint32 ipl = sockt->session[fd]->client_addr;
sockt->ip2str(ipl, ip);
if (sockt->session[fd]->flag.eof) {
ShowInfo("Closed connection from '"CL_WHITE"%s"CL_RESET"'.\n", ip);
sockt->close(fd);
return 0;
}
if ((sd = sockt->session[fd]->session_data) == NULL) {
// Perform ip-ban check
if (login->config->ipban && !sockt->trusted_ip_check(ipl) && ipban->check(ipl)) {
ShowStatus("Connection refused: IP isn't authorized (deny/allow, ip: %s).\n", ip);
loginlog->log(ipl, "unknown", -3, "ip banned");
lclif->login_error(fd, 3); // 3 = Rejected from Server
sockt->eof(fd);
return 0;
}
// create a session for this new connection
CREATE(sockt->session[fd]->session_data, struct login_session_data, 1);
sd = sockt->session[fd]->session_data;
sd->fd = fd;
}
for (i = 0; i < MAX_PROCESSED_PACKETS; ++i) {
enum parsefunc_rcode result;
int16 packet_id = RFIFOW(fd, 0);
int packet_len = (int)RFIFOREST(fd);
if (packet_len < 2)
return 0;
result = lclif->p->parse_sub(fd, sd);
switch (result) {
case PACKET_SKIP:
continue;
case PACKET_INCOMPLETE:
case PACKET_STOPPARSE:
return 0;
case PACKET_UNKNOWN:
ShowWarning("lclif_parse: Received unsupported packet (packet 0x%04x, %d bytes received), disconnecting session #%d.\n", (unsigned int)packet_id, packet_len, fd);
#ifdef DUMP_INVALID_PACKET
ShowDump(RFIFOP(fd, 0), RFIFOREST(fd));
#endif
sockt->eof(fd);
return 0;
case PACKET_INVALIDLENGTH:
ShowWarning("lclif_parse: Received packet 0x%04x specifies invalid packet_len (%d), disconnecting session #%d.\n", (unsigned int)packet_id, packet_len, fd);
#ifdef DUMP_INVALID_PACKET
ShowDump(RFIFOP(fd, 0), RFIFOREST(fd));
#endif
sockt->eof(fd);
return 0;
}
}
return 0;
}
/// @copydoc lclif_interface_private::parse_sub()
static enum parsefunc_rcode lclif_parse_sub(int fd, struct login_session_data *sd)
{
int packet_len = (int)RFIFOREST(fd);
int16 packet_id = RFIFOW(fd, 0);
const struct login_packet_db *lpd;
if (VECTOR_LENGTH(HPM->packets[hpParse_Login]) > 0) {
int result = HPM->parse_packets(fd, packet_id, hpParse_Login);
if (result == 1)
return PACKET_VALID;
if (result == 2)
return PACKET_INCOMPLETE; // Packet not completed yet
}
lpd = lclif->packet(packet_id);
if (lpd == NULL)
return PACKET_UNKNOWN;
if (lpd->len == 0)
return PACKET_UNKNOWN;
if (lpd->len > 0 && lpd->pFunc == NULL)
return PACKET_UNKNOWN; //This Packet is defined for length purpose ? should never be sent from client ?
if (lpd->len == -1) {
uint16 packet_var_len = 0; //Max Variable Packet length is signed int16 size
if (packet_len < 4)
return PACKET_INCOMPLETE; //Packet incomplete
packet_var_len = RFIFOW(fd, 2);
if (packet_var_len < 4 || packet_var_len > SINT16_MAX)
return PACKET_INVALIDLENGTH; //Something is wrong, close connection.
if (RFIFOREST(fd) < packet_var_len)
return PACKET_INCOMPLETE; //Packet incomplete again.
return lclif->parse_packet(lpd, fd, sd);
} else if (lpd->len <= packet_len) {
return lclif->parse_packet(lpd, fd, sd);
}
return PACKET_VALID;
}
/// @copydoc lclif_interface::packet()
static const struct login_packet_db *lclif_packet(int16 packet_id)
{
if (packet_id == PACKET_ID_CA_CHARSERVERCONNECT)
return &lclif->p->dbs->packet_db[0];
if (packet_id > MAX_PACKET_LOGIN_DB || packet_id < MIN_PACKET_DB)
return NULL;
return &lclif->p->dbs->packet_db[packet_id];
}
/// @copydoc lclif_interface::parse_packet()
static enum parsefunc_rcode lclif_parse_packet(const struct login_packet_db *lpd, int fd, struct login_session_data *sd)
{
int result;
result = (*lpd->pFunc)(fd, sd);
RFIFOSKIP(fd, (lpd->len == -1) ? RFIFOW(fd, 2) : lpd->len);
return result;
}
/// @copydoc lclif_interface_private::packetdb_loaddb()
static void packetdb_loaddb(void)
{
int i;
struct packet {
int16 packet_id;
int16 packet_len;
LoginParseFunc **pFunc;
} packet[] = {
#define packet_def(name) { PACKET_ID_ ## name, sizeof(struct packet_ ## name), &lclif->p->parse_ ## name }
#define packet_def2(name, len) { PACKET_ID_ ## name, (len), &lclif->p->parse_ ## name }
packet_def(CA_CONNECT_INFO_CHANGED),
packet_def(CA_EXE_HASHCHECK),
packet_def(CA_LOGIN),
packet_def(CA_LOGIN2),
packet_def(CA_LOGIN3),
packet_def(CA_LOGIN4),
packet_def(CA_LOGIN_PCBANG),
packet_def(CA_LOGIN_HAN),
packet_def2(CA_SSO_LOGIN_REQ, -1),
packet_def(CA_LOGIN_OTP),
packet_def(CA_REQ_HASH),
#undef packet_def
#undef packet_def2
};
int length = ARRAYLENGTH(packet);
memset(lclif->p->dbs->packet_db, '\0', sizeof(lclif->p->dbs->packet_db));
for (i = 0; i < length; ++i) {
int16 packet_id = packet[i].packet_id;
Assert_retb(packet_id >= MIN_PACKET_DB && packet_id <= MAX_PACKET_LOGIN_DB);
lclif->p->dbs->packet_db[packet_id].len = packet[i].packet_len;
lclif->p->dbs->packet_db[packet_id].pFunc = packet[i].pFunc;
}
//Explict case, we will save character login packet in position 0 which is unused and not valid by normal
lclif->p->dbs->packet_db[0].len = sizeof(struct packet_CA_CHARSERVERCONNECT);
lclif->p->dbs->packet_db[0].pFunc = &lclif->p->parse_CA_CHARSERVERCONNECT;
}
/// @copydoc lclif_interface::init()
static void lclif_init(void)
{
lclif->p->packetdb_loaddb();
}
/// @copydoc lclif_interface::final()
static void lclif_final(void)
{
}
/// Interface base initialization.
void lclif_defaults(void)
{
lclif = &lclif_s;
lclif->p = &lclif_p;
lclif->p->dbs = &lclif_dbs;
lclif->init = lclif_init;
lclif->final = lclif_final;
lclif->connection_error = lclif_connection_error;
lclif->server_list = lclif_send_server_list;
lclif->auth_failed = lclif_send_auth_failed;
lclif->login_error = lclif_send_login_error;
lclif->coding_key = lclif_send_coding_key;
lclif->packet = lclif_packet;
lclif->parse_packet = lclif_parse_packet;
lclif->parse = lclif_parse;
lclif->p->packetdb_loaddb = packetdb_loaddb;
lclif->p->parse_sub = lclif_parse_sub;
lclif->p->parse_CA_CONNECT_INFO_CHANGED = lclif_parse_CA_CONNECT_INFO_CHANGED;
lclif->p->parse_CA_EXE_HASHCHECK = lclif_parse_CA_EXE_HASHCHECK;
lclif->p->parse_CA_LOGIN = lclif_parse_CA_LOGIN;
lclif->p->parse_CA_LOGIN2 = lclif_parse_CA_LOGIN2;
lclif->p->parse_CA_LOGIN3 = lclif_parse_CA_LOGIN3;
lclif->p->parse_CA_LOGIN4 = lclif_parse_CA_LOGIN4;
lclif->p->parse_CA_LOGIN_PCBANG = lclif_parse_CA_LOGIN_PCBANG;
lclif->p->parse_CA_LOGIN_HAN = lclif_parse_CA_LOGIN_HAN;
lclif->p->parse_CA_SSO_LOGIN_REQ = lclif_parse_CA_SSO_LOGIN_REQ;
lclif->p->parse_CA_LOGIN_OTP = lclif_parse_CA_LOGIN_OTP;
lclif->p->parse_CA_REQ_HASH = lclif_parse_CA_REQ_HASH;
lclif->p->parse_CA_CHARSERVERCONNECT = lclif_parse_CA_CHARSERVERCONNECT;
}