1

/* $Id$ */

     2

     3

#ifdef ENABLE_NETWORK

     4

     5

#include "../stdafx.h"

     6

#include "../debug.h"

     7

#include "../string.h"

     8

#include "network_data.h"

     9

#include "../date.h"

    10

#include "../map.h"

    11

#include "network_gamelist.h"

    12

#include "network_udp.h"

    13

#include "../variables.h"

    14

#include "../newgrf_config.h"

    15

    16

#include "core/udp.h"

    17

    18

/**

    19

 * @file network_udp.c This file handles the UDP related communication.

    20

 *

    21

 * This is the GameServer <-> MasterServer and GameServer <-> GameClient

    22

 * communication before the game is being joined.

    23

 */

    24

    25

enum {

    26

	ADVERTISE_NORMAL_INTERVAL = 30000, // interval between advertising in ticks (15 minutes)

    27

	ADVERTISE_RETRY_INTERVAL  =   300, // readvertise when no response after this many ticks (9 seconds)

    28

	ADVERTISE_RETRY_TIMES     =     3  // give up readvertising after this much failed retries

    29

};

    30

    31

#define DEF_UDP_RECEIVE_COMMAND(type) void NetworkPacketReceive_ ## type ## _command(Packet *p, const struct sockaddr_in *client_addr)

    32

    33

static NetworkClientState _udp_cs;

    34

    35

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER)

    36

{

    37

	Packet *packet;

    38

	// Just a fail-safe.. should never happen

    39

	if (!_network_udp_server)

    40

		return;

    41

    42

	packet = NetworkSend_Init(PACKET_UDP_SERVER_RESPONSE);

    43

    44

	// Update some game_info

    45

	_network_game_info.game_date     = _date;

    46

	_network_game_info.map_width     = MapSizeX();

    47

	_network_game_info.map_height    = MapSizeY();

    48

	_network_game_info.map_set       = _opt.landscape;

    49

	_network_game_info.companies_on  = ActivePlayerCount();

    50

	_network_game_info.spectators_on = NetworkSpectatorCount();

    51

	_network_game_info.grfconfig     = _grfconfig;

    52

    53

	NetworkSend_NetworkGameInfo(packet, &_network_game_info);

    54

    55

	// Let the client know that we are here

    56

	NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);

    57

    58

	free(packet);

    59

    60

	DEBUG(net, 2, "[udp] queried from '%s'", inet_ntoa(client_addr->sin_addr));

    61

}

    62

    63

void HandleIncomingNetworkGameInfoGRFConfig(GRFConfig *config)

    64

{

    65

	/* Find the matching GRF file */

    66

	const GRFConfig *f = FindGRFConfig(config->grfid, config->md5sum);

    67

	if (f == NULL) {

    68

		/* Don't know the GRF, so mark game incompatible and the (possibly)

    69

		 * already resolved name for this GRF (another server has sent the

    70

		 * name of the GRF already */

    71

		config->name     = FindUnknownGRFName(config->grfid, config->md5sum, true);

    72

		SETBIT(config->flags, GCF_NOT_FOUND);

    73

	} else {

    74

		config->filename = f->filename;

    75

		config->name     = f->name;

    76

		config->info     = f->info;

    77

	}

    78

	SETBIT(config->flags, GCF_COPY);

    79

}

    80

    81

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE)

    82

{

    83

	extern const char _openttd_revision[];

    84

	NetworkGameList *item;

    85

    86

	// Just a fail-safe.. should never happen

    87

	if (_network_udp_server || _udp_cs.has_quit) return;

    88

    89

	DEBUG(net, 4, "[udp] server response from %s:%d", inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));

    90

    91

	// Find next item

    92

	item = NetworkGameListAddItem(inet_addr(inet_ntoa(client_addr->sin_addr)), ntohs(client_addr->sin_port));

    93

    94

	NetworkRecv_NetworkGameInfo(&_udp_cs, p, &item->info);

    95

    96

	item->info.compatible = true;

    97

	{

    98

		/* Checks whether there needs to be a request for names of GRFs and makes

    99

		 * the request if necessary. GRFs that need to be requested are the GRFs

   100

		 * that do not exist on the clients system and we do not have the name

   101

		 * resolved of, i.e. the name is still UNKNOWN_GRF_NAME_PLACEHOLDER.

   102

		 * The in_request array and in_request_count are used so there is no need

   103

		 * to do a second loop over the GRF list, which can be relatively expensive

   104

		 * due to the string comparisons. */

   105

		const GRFConfig *in_request[NETWORK_MAX_GRF_COUNT];

   106

		const GRFConfig *c;

   107

		uint in_request_count = 0;

   108

		struct sockaddr_in out_addr;

   109

   110

		for (c = item->info.grfconfig; c != NULL; c = c->next) {

   111

			if (HASBIT(c->flags, GCF_NOT_FOUND)) item->info.compatible = false;

   112

			if (!HASBIT(c->flags, GCF_NOT_FOUND) || strcmp(c->name, UNKNOWN_GRF_NAME_PLACEHOLDER) != 0) continue;

   113

			in_request[in_request_count] = c;

   114

			in_request_count++;

   115

		}

   116

   117

		if (in_request_count > 0) {

   118

			/* There are 'unknown' GRFs, now send a request for them */

   119

			uint i;

   120

			Packet *packet = NetworkSend_Init(PACKET_UDP_CLIENT_GET_NEWGRFS);

   121

   122

			NetworkSend_uint8 (packet, in_request_count);

   123

			for (i = 0; i < in_request_count; i++) {

   124

				NetworkSend_GRFIdentifier(packet, in_request[i]);

   125

			}

   126

   127

			out_addr.sin_family      = AF_INET;

   128

			out_addr.sin_port        = htons(item->port);

   129

			out_addr.sin_addr.s_addr = item->ip;

   130

			NetworkSendUDP_Packet(_udp_client_socket, packet, &out_addr);

   131

			free(packet);

   132

		}

   133

	}

   134

   135

	if (item->info.server_lang >= NETWORK_NUM_LANGUAGES) item->info.server_lang = 0;

   136

	if (item->info.map_set >= NUM_LANDSCAPE ) item->info.map_set = 0;

   137

   138

	if (item->info.hostname[0] == '\0')

   139

		snprintf(item->info.hostname, sizeof(item->info.hostname), "%s", inet_ntoa(client_addr->sin_addr));

   140

   141

	/* Check if we are allowed on this server based on the revision-match */

   142

	item->info.version_compatible =

   143

		strcmp(item->info.server_revision, _openttd_revision) == 0 ||

   144

		strcmp(item->info.server_revision, NOREV_STRING) == 0;

   145

	item->info.compatible &= item->info.version_compatible; // Already contains match for GRFs

   146

   147

	item->online = true;

   148

   149

	UpdateNetworkGameWindow(false);

   150

}

   151

   152

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO)

   153

{

   154

	NetworkClientState *cs;

   155

	NetworkClientInfo *ci;

   156

	Packet *packet;

   157

	Player *player;

   158

	byte current = 0;

   159

	int i;

   160

   161

	// Just a fail-safe.. should never happen

   162

	if (!_network_udp_server) return;

   163

   164

	packet = NetworkSend_Init(PACKET_UDP_SERVER_DETAIL_INFO);

   165

   166

	/* Send the amount of active companies */

   167

	NetworkSend_uint8 (packet, NETWORK_COMPANY_INFO_VERSION);

   168

	NetworkSend_uint8 (packet, ActivePlayerCount());

   169

   170

	/* Fetch the latest version of everything */

   171

	NetworkPopulateCompanyInfo();

   172

   173

	/* Go through all the players */

   174

	FOR_ALL_PLAYERS(player) {

   175

		/* Skip non-active players */

   176

		if (!player->is_active) continue;

   177

   178

		current++;

   179

   180

		/* Send the information */

   181

		NetworkSend_uint8(packet, current);

   182

   183

		NetworkSend_string(packet, _network_player_info[player->index].company_name);

   184

		NetworkSend_uint32(packet, _network_player_info[player->index].inaugurated_year);

   185

		NetworkSend_uint64(packet, _network_player_info[player->index].company_value);

   186

		NetworkSend_uint64(packet, _network_player_info[player->index].money);

   187

		NetworkSend_uint64(packet, _network_player_info[player->index].income);

   188

		NetworkSend_uint16(packet, _network_player_info[player->index].performance);

   189

   190

		/* Send 1 if there is a passord for the company else send 0 */

   191

		if (_network_player_info[player->index].password[0] != '\0') {

   192

			NetworkSend_uint8(packet, 1);

   193

		} else {

   194

			NetworkSend_uint8(packet, 0);

   195

		}

   196

   197

		for (i = 0; i < NETWORK_VEHICLE_TYPES; i++)

   198

			NetworkSend_uint16(packet, _network_player_info[player->index].num_vehicle[i]);

   199

   200

		for (i = 0; i < NETWORK_STATION_TYPES; i++)

   201

			NetworkSend_uint16(packet, _network_player_info[player->index].num_station[i]);

   202

   203

		/* Find the clients that are connected to this player */

   204

		FOR_ALL_CLIENTS(cs) {

   205

			ci = DEREF_CLIENT_INFO(cs);

   206

			if (ci->client_playas == player->index) {

   207

				/* The uint8 == 1 indicates that a client is following */

   208

				NetworkSend_uint8(packet, 1);

   209

				NetworkSend_string(packet, ci->client_name);

   210

				NetworkSend_string(packet, ci->unique_id);

   211

				NetworkSend_uint32(packet, ci->join_date);

   212

			}

   213

		}

   214

		/* Also check for the server itself */

   215

		ci = NetworkFindClientInfoFromIndex(NETWORK_SERVER_INDEX);

   216

		if (ci->client_playas == player->index) {

   217

			/* The uint8 == 1 indicates that a client is following */

   218

			NetworkSend_uint8(packet, 1);

   219

			NetworkSend_string(packet, ci->client_name);

   220

			NetworkSend_string(packet, ci->unique_id);

   221

			NetworkSend_uint32(packet, ci->join_date);

   222

		}

   223

   224

		/* Indicates end of client list */

   225

		NetworkSend_uint8(packet, 0);

   226

	}

   227

   228

	/* And check if we have any spectators */

   229

	FOR_ALL_CLIENTS(cs) {

   230

		ci = DEREF_CLIENT_INFO(cs);

   231

		if (!IsValidPlayer(ci->client_playas)) {

   232

			/* The uint8 == 1 indicates that a client is following */

   233

			NetworkSend_uint8(packet, 1);

   234

			NetworkSend_string(packet, ci->client_name);

   235

			NetworkSend_string(packet, ci->unique_id);

   236

			NetworkSend_uint32(packet, ci->join_date);

   237

		}

   238

	}

   239

   240

	/* Also check for the server itself */

   241

	ci = NetworkFindClientInfoFromIndex(NETWORK_SERVER_INDEX);

   242

	if (!IsValidPlayer(ci->client_playas)) {

   243

		/* The uint8 == 1 indicates that a client is following */

   244

		NetworkSend_uint8(packet, 1);

   245

		NetworkSend_string(packet, ci->client_name);

   246

		NetworkSend_string(packet, ci->unique_id);

   247

		NetworkSend_uint32(packet, ci->join_date);

   248

	}

   249

   250

	/* Indicates end of client list */

   251

	NetworkSend_uint8(packet, 0);

   252

   253

	NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);

   254

   255

	free(packet);

   256

}

   257

   258

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST)

   259

{

   260

	int i;

   261

	struct in_addr ip;

   262

	uint16 port;

   263

	uint8 ver;

   264

   265

	/* packet begins with the protocol version (uint8)

   266

	 * then an uint16 which indicates how many

   267

	 * ip:port pairs are in this packet, after that

   268

	 * an uint32 (ip) and an uint16 (port) for each pair

   269

	 */

   270

   271

	ver = NetworkRecv_uint8(&_udp_cs, p);

   272

   273

	if (_udp_cs.has_quit) return;

   274

   275

	if (ver == 1) {

   276

		for (i = NetworkRecv_uint16(&_udp_cs, p); i != 0 ; i--) {

   277

			ip.s_addr = TO_LE32(NetworkRecv_uint32(&_udp_cs, p));

   278

			port = NetworkRecv_uint16(&_udp_cs, p);

   279

			NetworkUDPQueryServer(inet_ntoa(ip), port);

   280

		}

   281

	}

   282

}

   283

   284

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER)

   285

{

   286

	_network_advertise_retries = 0;

   287

	DEBUG(net, 2, "[udp] advertising on master server successfull");

   288

   289

	/* We are advertised, but we don't want to! */

   290

	if (!_network_advertise) NetworkUDPRemoveAdvertise();

   291

}

   292

   293

/**

   294

 * A client has requested the names of some NewGRFs.

   295

 *

   296

 * Replying this can be tricky as we have a limit of SEND_MTU bytes

   297

 * in the reply packet and we can send up to 100 bytes per NewGRF

   298

 * (GRF ID, MD5sum and NETWORK_GRF_NAME_LENGTH bytes for the name).

   299

 * As SEND_MTU is _much_ less than 100 * NETWORK_MAX_GRF_COUNT, it

   300

 * could be that a packet overflows. To stop this we only reply

   301

 * with the first N NewGRFs so that if the first N + 1 NewGRFs

   302

 * would be sent, the packet overflows.

   303

 * in_reply and in_reply_count are used to keep a list of GRFs to

   304

 * send in the reply.

   305

 */

   306

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS)

   307

{

   308

	uint8 num_grfs;

   309

	uint i;

   310

   311

	const GRFConfig *in_reply[NETWORK_MAX_GRF_COUNT];

   312

	Packet *packet;

   313

	uint8 in_reply_count = 0;

   314

	uint packet_len = 0;

   315

   316

	/* Just a fail-safe.. should never happen */

   317

	if (_udp_cs.has_quit) return;

   318

   319

	DEBUG(net, 6, "[udp] newgrf data request from %s:%d", inet_ntoa(client_addr->sin_addr), ntohs(client_addr->sin_port));

   320

   321

	num_grfs = NetworkRecv_uint8 (&_udp_cs, p);

   322

	if (num_grfs > NETWORK_MAX_GRF_COUNT) return;

   323

   324

	for (i = 0; i < num_grfs; i++) {

   325

		GRFConfig c;

   326

		const GRFConfig *f;

   327

   328

		NetworkRecv_GRFIdentifier(&_udp_cs, p, &c);

   329

   330

		/* Find the matching GRF file */

   331

		f = FindGRFConfig(c.grfid, c.md5sum);

   332

		if (f == NULL) continue; // The GRF is unknown to this server

   333

   334

		/* If the reply might exceed the size of the packet, only reply

   335

		 * the current list and do not send the other data.

   336

		 * The name could be an empty string, if so take the filename. */

   337

		packet_len += sizeof(c.grfid) + sizeof(c.md5sum) +

   338

				min(strlen((f->name != NULL && strlen(f->name) > 0) ? f->name : f->filename) + 1, NETWORK_GRF_NAME_LENGTH);

   339

		if (packet_len > SEND_MTU - 4) { // 4 is 3 byte header + grf count in reply

   340

			break;

   341

		}

   342

		in_reply[in_reply_count] = f;

   343

		in_reply_count++;

   344

	}

   345

   346

	if (in_reply_count == 0) return;

   347

   348

	packet = NetworkSend_Init(PACKET_UDP_SERVER_NEWGRFS);

   349

	NetworkSend_uint8 (packet, in_reply_count);

   350

	for (i = 0; i < in_reply_count; i++) {

   351

		char name[NETWORK_GRF_NAME_LENGTH];

   352

   353

		/* The name could be an empty string, if so take the filename */

   354

		ttd_strlcpy(name, (in_reply[i]->name != NULL && strlen(in_reply[i]->name) > 0) ?

   355

				in_reply[i]->name : in_reply[i]->filename, sizeof(name));

   356

	 	NetworkSend_GRFIdentifier(packet, in_reply[i]);

   357

		NetworkSend_string(packet, name);

   358

	}

   359

   360

	NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);

   361

	free(packet);

   362

}

   363

   364

/** The return of the client's request of the names of some NewGRFs */

   365

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS)

   366

{

   367

	uint8 num_grfs;

   368

	uint i;

   369

   370

	/* Just a fail-safe.. should never happen */

   371

	if (_udp_cs.has_quit) return;

   372

   373

	DEBUG(net, 6, "[udp] newgrf data reply from %s:%d", inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));

   374

   375

	num_grfs = NetworkRecv_uint8 (&_udp_cs, p);

   376

	if (num_grfs > NETWORK_MAX_GRF_COUNT) return;

   377

   378

	for (i = 0; i < num_grfs; i++) {

   379

		char *unknown_name;

   380

		char name[NETWORK_GRF_NAME_LENGTH];

   381

		GRFConfig c;

   382

   383

		NetworkRecv_GRFIdentifier(&_udp_cs, p, &c);

   384

		NetworkRecv_string(&_udp_cs, p, name, sizeof(name));

   385

   386

		/* An empty name is not possible under normal circumstances

   387

		 * and causes problems when showing the NewGRF list. */

   388

		if (strlen(name) == 0) continue;

   389

   390

		/* Finds the fake GRFConfig for the just read GRF ID and MD5sum tuple.

   391

		 * If it exists and not resolved yet, then name of the fake GRF is

   392

		 * overwritten with the name from the reply. */

   393

		unknown_name = FindUnknownGRFName(c.grfid, c.md5sum, false);

   394

		if (unknown_name != NULL && strcmp(unknown_name, UNKNOWN_GRF_NAME_PLACEHOLDER) == 0) {

   395

			ttd_strlcpy(unknown_name, name, NETWORK_GRF_NAME_LENGTH);

   396

		}

   397

	}

   398

}

   399

   400

/**

   401

 * Every type of UDP packet should only be received by a single socket;

   402

 * The socket communicating with the masterserver should receive the

   403

 * game information of some 'random' host.

   404

 */

   405

typedef struct NetworkUDPPacketAndSocket {

   406

	void (*callback)(Packet *p, const struct sockaddr_in *client_addr);

   407

	SOCKET *incoming_socket;

   408

} NetworkUPDPacketAndSocket;

   409

   410

static const NetworkUPDPacketAndSocket _network_udp_packet[PACKET_UDP_END] = {

   411

	{ RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER),   &_udp_server_socket },

   412

	{ RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE),      &_udp_client_socket },

   413

	{ RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO),   &_udp_server_socket },

   414

	{ NULL,                                             NULL                },

   415

	{ NULL,                                             NULL                },

   416

	{ RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER),  &_udp_master_socket },

   417

	{ NULL,                                             NULL                },

   418

	{ RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST), &_udp_client_socket },

   419

	{ NULL,                                             NULL                },

   420

	{ RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS),   &_udp_server_socket },

   421

	{ RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS),       &_udp_client_socket },

   422

};

   423

   424

void NetworkHandleUDPPacket(const SOCKET udp, Packet *p, const struct sockaddr_in *client_addr)

   425

{

   426

	byte type;

   427

   428

	/* Fake a client, so we can see when there is an illegal packet */

   429

	_udp_cs.socket = INVALID_SOCKET;

   430

	_udp_cs.has_quit = false;

   431

   432

	type = NetworkRecv_uint8(&_udp_cs, p);

   433

   434

	if (type < PACKET_UDP_END && *_network_udp_packet[type].incoming_socket == udp && !_udp_cs.has_quit) {

   435

		_network_udp_packet[type].callback(p, client_addr);

   436

	} else {

   437

		if (*_network_udp_packet[type].incoming_socket != udp) {

   438

			DEBUG(net, 0, "[udp] received packet on wrong port from %s:%d", inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));

   439

		} else if (!_udp_cs.has_quit) {

   440

			DEBUG(net, 0, "[udp] received invalid packet type %d from %s:%d", type,  inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));

   441

		} else {

   442

			DEBUG(net, 0, "[udp] received illegal packet from %s:%d", inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));

   443

		}

   444

	}

   445

}

   446

   447

   448

// Close UDP connection

   449

void NetworkUDPStop(void)

   450

{

   451

	DEBUG(net, 1, "[udp] closed listeners");

   452

   453

	if (_network_udp_server) {

   454

		NetworkUDPClose(&_udp_server_socket);

   455

		NetworkUDPClose(&_udp_master_socket);

   456

	} else {

   457

		NetworkUDPClose(&_udp_client_socket);

   458

	}

   459

   460

	_network_udp_server = false;

   461

	_network_udp_broadcast = 0;

   462

}

   463

   464

// Broadcast to all ips

   465

static void NetworkUDPBroadCast(SOCKET udp)

   466

{

   467

	Packet* p = NetworkSend_Init(PACKET_UDP_CLIENT_FIND_SERVER);

   468

	uint i;

   469

   470

	for (i = 0; _broadcast_list[i] != 0; i++) {

   471

		struct sockaddr_in out_addr;

   472

   473

		out_addr.sin_family = AF_INET;

   474

		out_addr.sin_port = htons(_network_server_port);

   475

		out_addr.sin_addr.s_addr = _broadcast_list[i];

   476

   477

		DEBUG(net, 4, "[udp] broadcasting to %s", inet_ntoa(out_addr.sin_addr));

   478

   479

		NetworkSendUDP_Packet(udp, p, &out_addr);

   480

	}

   481

   482

	free(p);

   483

}

   484

   485

   486

// Request the the server-list from the master server

   487

void NetworkUDPQueryMasterServer(void)

   488

{

   489

	struct sockaddr_in out_addr;

   490

	Packet *p;

   491