1

#include "stdafx.h"

     2

#include "network_data.h"

     3

     4

#ifdef ENABLE_NETWORK

     5

     6

#include "map.h"

     7

#include "network_gamelist.h"

     8

#include "network_udp.h"

     9

    10

extern void UpdateNetworkGameWindow(bool unselect);

    11

extern void NetworkPopulateCompanyInfo(void);

    12

    13

//

    14

// This file handles all the LAN-stuff

    15

// Stuff like:

    16

//   - UDP search over the network

    17

//

    18

    19

typedef enum {

    20

	PACKET_UDP_CLIENT_FIND_SERVER,

    21

	PACKET_UDP_SERVER_RESPONSE,

    22

	PACKET_UDP_CLIENT_DETAIL_INFO,

    23

	PACKET_UDP_SERVER_DETAIL_INFO, // Is not used in OpenTTD itself, only for external querying

    24

	PACKET_UDP_SERVER_REGISTER, // Packet to register itself to the master server

    25

	PACKET_UDP_MASTER_ACK_REGISTER, // Packet indicating registration has succedeed

    26

	PACKET_UDP_CLIENT_GET_LIST, // Request for serverlist from master server

    27

	PACKET_UDP_MASTER_RESPONSE_LIST, // Response from master server with server ip's + port's

    28

	PACKET_UDP_SERVER_UNREGISTER, // Request to be removed from the server-list

    29

	PACKET_UDP_END

    30

} PacketUDPType;

    31

    32

enum {

    33

	ADVERTISE_NORMAL_INTERVAL = 450,	// interval between advertising in days

    34

	ADVERTISE_RETRY_INTERVAL = 5,			// readvertise when no response after this amount of days

    35

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

    36

};

    37

    38

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

    39

void NetworkSendUDP_Packet(SOCKET udp, Packet *p, struct sockaddr_in *recv);

    40

    41

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER)

    42

{

    43

	Packet *packet;

    44

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

    45

	if (!_network_udp_server)

    46

		return;

    47

    48

	packet = NetworkSend_Init(PACKET_UDP_SERVER_RESPONSE);

    49

    50

	// Update some game_info

    51

	_network_game_info.game_date = _date;

    52

	_network_game_info.map_width = MapSizeX();

    53

	_network_game_info.map_height = MapSizeY();

    54

	_network_game_info.map_set = _opt.landscape;

    55

    56

	NetworkSend_uint8 (packet, NETWORK_GAME_INFO_VERSION);

    57

	NetworkSend_string(packet, _network_game_info.server_name);

    58

	NetworkSend_string(packet, _network_game_info.server_revision);

    59

	NetworkSend_uint8 (packet, _network_game_info.server_lang);

    60

	NetworkSend_uint8 (packet, _network_game_info.use_password);

    61

	NetworkSend_uint8 (packet, _network_game_info.clients_max);

    62

	NetworkSend_uint8 (packet, _network_game_info.clients_on);

    63

	NetworkSend_uint8 (packet, _network_game_info.spectators_on);

    64

	NetworkSend_uint16(packet, _network_game_info.game_date);

    65

	NetworkSend_uint16(packet, _network_game_info.start_date);

    66

	NetworkSend_string(packet, _network_game_info.map_name);

    67

	NetworkSend_uint16(packet, _network_game_info.map_width);

    68

	NetworkSend_uint16(packet, _network_game_info.map_height);

    69

	NetworkSend_uint8 (packet, _network_game_info.map_set);

    70

	NetworkSend_uint8 (packet, _network_game_info.dedicated);

    71

    72

	// Let the client know that we are here

    73

	NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);

    74

    75

	free(packet);

    76

    77

	DEBUG(net, 2)("[NET][UDP] Queried from %s", inet_ntoa(client_addr->sin_addr));

    78

}

    79

    80

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE)

    81

{

    82

	NetworkGameList *item;

    83

	byte game_info_version;

    84

    85

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

    86

	if (_network_udp_server)

    87

		return;

    88

    89

	game_info_version = NetworkRecv_uint8(p);

    90

    91

    92

	DEBUG(net, 6)("[NET][UDP] Server response from %s:%d", inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));

    93

    94

	// Find next item

    95

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

    96

    97

	if (game_info_version == 1) {

    98

		NetworkRecv_string(p, item->info.server_name, sizeof(item->info.server_name));

    99

		NetworkRecv_string(p, item->info.server_revision, sizeof(item->info.server_revision));

   100

		item->info.server_lang = NetworkRecv_uint8(p);

   101

		item->info.use_password = NetworkRecv_uint8(p);

   102

		item->info.clients_max = NetworkRecv_uint8(p);

   103

		item->info.clients_on = NetworkRecv_uint8(p);

   104

		item->info.spectators_on = NetworkRecv_uint8(p);

   105

		item->info.game_date = NetworkRecv_uint16(p);

   106

		item->info.start_date = NetworkRecv_uint16(p);

   107

		NetworkRecv_string(p, item->info.map_name, sizeof(item->info.map_name));

   108

		item->info.map_width = NetworkRecv_uint16(p);

   109

		item->info.map_height = NetworkRecv_uint16(p);

   110

		item->info.map_set = NetworkRecv_uint8(p);

   111

		item->info.dedicated = NetworkRecv_uint8(p);

   112

   113

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

   114

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

   115

	}

   116

   117

	item->online = true;

   118

   119

	UpdateNetworkGameWindow(false);

   120

}

   121

   122

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO)

   123

{

   124

	NetworkClientState *cs;

   125

	NetworkClientInfo *ci;

   126

	Packet *packet;

   127

	Player *player;

   128

	byte active = 0;

   129

	byte current = 0;

   130

	int i;

   131

   132

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

   133

	if (!_network_udp_server)

   134

		return;

   135

   136

	packet = NetworkSend_Init(PACKET_UDP_SERVER_DETAIL_INFO);

   137

   138

	FOR_ALL_PLAYERS(player) {

   139

		if (player->is_active)

   140

			active++;

   141

	}

   142

   143

	/* Send the amount of active companies */

   144

	NetworkSend_uint8 (packet, NETWORK_COMPANY_INFO_VERSION);

   145

	NetworkSend_uint8 (packet, active);

   146

   147

	/* Fetch the latest version of everything */

   148

	NetworkPopulateCompanyInfo();

   149

   150

	/* Go through all the players */

   151

	FOR_ALL_PLAYERS(player) {

   152

		/* Skip non-active players */

   153

		if (!player->is_active)

   154

			continue;

   155

   156

		current++;

   157

   158

		/* Send the information */

   159

		NetworkSend_uint8 (packet, current);

   160

   161

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

   162

		NetworkSend_uint8 (packet, _network_player_info[player->index].inaugurated_year);

   163

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

   164

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

   165

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

   166

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

   167

   168

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

   169

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

   170

   171

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

   172

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

   173

   174

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

   175

		FOR_ALL_CLIENTS(cs) {

   176

			ci = DEREF_CLIENT_INFO(cs);

   177

			if ((ci->client_playas - 1) == player->index) {

   178

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

   179

				NetworkSend_uint8(packet, 1);

   180

				NetworkSend_string(packet, ci->client_name);

   181

				NetworkSend_string(packet, ci->unique_id);

   182

				NetworkSend_uint16(packet, ci->join_date);

   183

			}

   184

		}

   185

		/* Also check for the server itself */

   186

		ci = NetworkFindClientInfoFromIndex(NETWORK_SERVER_INDEX);

   187

		if ((ci->client_playas - 1) == player->index) {

   188

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

   189

			NetworkSend_uint8(packet, 1);

   190

			NetworkSend_string(packet, ci->client_name);

   191

			NetworkSend_string(packet, ci->unique_id);

   192

			NetworkSend_uint16(packet, ci->join_date);

   193

		}

   194

   195

		/* Indicates end of client list */

   196

		NetworkSend_uint8(packet, 0);

   197

	}

   198

   199

	/* And check if we have any spectators */

   200

	FOR_ALL_CLIENTS(cs) {

   201

		ci = DEREF_CLIENT_INFO(cs);

   202

		if ((ci->client_playas - 1) > MAX_PLAYERS) {

   203

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

   204

			NetworkSend_uint8(packet, 1);

   205

			NetworkSend_string(packet, ci->client_name);

   206

			NetworkSend_string(packet, ci->unique_id);

   207

			NetworkSend_uint16(packet, ci->join_date);

   208

		}

   209

	}

   210

	/* Also check for the server itself */

   211

	ci = NetworkFindClientInfoFromIndex(NETWORK_SERVER_INDEX);

   212

	if ((ci->client_playas - 1) > MAX_PLAYERS) {

   213

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

   214

		NetworkSend_uint8(packet, 1);

   215

		NetworkSend_string(packet, ci->client_name);

   216

		NetworkSend_string(packet, ci->unique_id);

   217

		NetworkSend_uint16(packet, ci->join_date);

   218

	}

   219

   220

	/* Indicates end of client list */

   221

	NetworkSend_uint8(packet, 0);

   222

   223

	NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);

   224

   225

	free(packet);

   226

}

   227

   228

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST) {

   229

	int i;

   230

	struct in_addr ip;

   231

	uint16 port;

   232

	uint8 ver;

   233

   234

	/* packet begins with the protocol version (uint8)

   235

	 * then an uint16 which indicates how many

   236

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

   237

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

   238

	 */

   239

   240

	ver = NetworkRecv_uint8(p);

   241

   242

	if (ver == 1) {

   243

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

   244

			ip.s_addr = TO_LE32(NetworkRecv_uint32(p));

   245

			port = NetworkRecv_uint16(p);

   246

			NetworkUDPQueryServer(inet_ntoa(ip), port);

   247

		}

   248

	}

   249

}

   250

   251

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER) {

   252

	_network_advertise_retries = 0;

   253

	DEBUG(net, 2)("[NET][UDP] We are advertised on the master-server!");

   254

   255

	if (!_network_advertise)

   256

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

   257

		NetworkUDPRemoveAdvertise();

   258

}

   259

   260

   261

// The layout for the receive-functions by UDP

   262

typedef void NetworkUDPPacket(Packet *p, struct sockaddr_in *client_addr);

   263

   264

static NetworkUDPPacket* const _network_udp_packet[] = {

   265

	RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER),

   266

	RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE),

   267

	RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO),

   268

	NULL,

   269

	NULL,

   270

	RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER),

   271

	NULL,

   272

	RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST),

   273

	NULL

   274

};

   275

   276

   277

// If this fails, check the array above with network_data.h

   278

assert_compile(lengthof(_network_udp_packet) == PACKET_UDP_END);

   279

   280

   281

void NetworkHandleUDPPacket(Packet *p, struct sockaddr_in *client_addr)

   282

{

   283

	byte type;

   284

   285

	type = NetworkRecv_uint8(p);

   286

   287

	if (type < PACKET_UDP_END && _network_udp_packet[type] != NULL) {

   288

		_network_udp_packet[type](p, client_addr);

   289

	}	else {

   290

		DEBUG(net, 0)("[NET][UDP] Received invalid packet type %d", type);

   291

	}

   292

}

   293

   294

   295

// Send a packet over UDP

   296

void NetworkSendUDP_Packet(SOCKET udp, Packet *p, struct sockaddr_in *recv)

   297

{

   298

	int res;

   299

   300

	// Put the length in the buffer

   301

	p->buffer[0] = p->size & 0xFF;

   302

	p->buffer[1] = p->size >> 8;

   303

   304

	// Send the buffer

   305

	res = sendto(udp, p->buffer, p->size, 0, (struct sockaddr *)recv, sizeof(*recv));

   306

   307

	// Check for any errors, but ignore it for the rest

   308

	if (res == -1) {

   309

		DEBUG(net, 1)("[NET][UDP] Send error: %i", GET_LAST_ERROR());

   310

	}

   311

}

   312

   313

// Start UDP listener

   314

bool NetworkUDPListen(SOCKET *udp, uint32 host, uint16 port, bool broadcast)

   315

{

   316

	struct sockaddr_in sin;

   317

   318

	// Make sure socket is closed

   319

	closesocket(*udp);

   320

   321

	*udp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

   322

	if (*udp == INVALID_SOCKET) {

   323

		DEBUG(net, 1)("[NET][UDP] Failed to start UDP support");

   324

		return false;

   325

	}

   326

   327

	// set nonblocking mode for socket

   328

	{

   329

		unsigned long blocking = 1;

   330

		ioctlsocket(*udp, FIONBIO, &blocking);

   331

	}

   332

   333

	sin.sin_family = AF_INET;

   334

	// Listen on all IPs

   335

	sin.sin_addr.s_addr = host;

   336

	sin.sin_port = htons(port);

   337

   338

	if (bind(*udp, (struct sockaddr*)&sin, sizeof(sin)) != 0) {

   339

		DEBUG(net, 1) ("[NET][UDP] error: bind failed on %s:%i", inet_ntoa(*(struct in_addr *)&host), port);

   340

		return false;

   341

	}

   342

   343

	if (broadcast) {

   344

		/* Enable broadcast */

   345

		unsigned long val = 1;

   346

		setsockopt(*udp, SOL_SOCKET, SO_BROADCAST, (char *) &val , sizeof(val));

   347

	}

   348

   349

	DEBUG(net, 1)("[NET][UDP] Listening on port %s:%d", inet_ntoa(*(struct in_addr *)&host), port);

   350

   351

	return true;

   352

}

   353

   354

// Close UDP connection

   355

void NetworkUDPClose(void)

   356

{

   357

	DEBUG(net, 1) ("[NET][UDP] Closed listeners");

   358

   359

	if (_network_udp_server) {

   360

		closesocket(_udp_server_socket);

   361

		_udp_server_socket = INVALID_SOCKET;

   362

   363

		closesocket(_udp_master_socket);

   364

		_udp_master_socket = INVALID_SOCKET;

   365

   366

		_network_udp_server = false;

   367

		_network_udp_broadcast = 0;

   368

	} else {

   369

		closesocket(_udp_client_socket);

   370

		_udp_client_socket = INVALID_SOCKET;

   371

		_network_udp_broadcast = 0;

   372

	}

   373

}

   374

   375

// Receive something on UDP level

   376

void NetworkUDPReceive(SOCKET udp)

   377

{

   378

	struct sockaddr_in client_addr;

   379

#ifndef __MORPHOS__

   380

	int client_len;

   381

#else

   382

	LONG client_len; // for some reason we need a 'LONG' under MorphOS

   383

#endif

   384

	int nbytes;

   385

	static Packet *p = NULL;

   386

	int packet_len;

   387

   388

	// If p is NULL, malloc him.. this prevents unneeded mallocs

   389

	if (p == NULL)

   390

		p = malloc(sizeof(Packet));

   391

   392

	packet_len = sizeof(p->buffer);

   393

	client_len = sizeof(client_addr);

   394

   395

	// Try to receive anything

   396

	nbytes = recvfrom(udp, p->buffer, packet_len, 0, (struct sockaddr *)&client_addr, &client_len);

   397

   398

	// We got some bytes.. just asume we receive the whole packet

   399

	if (nbytes > 0) {

   400

		// Get the size of the buffer

   401

		p->size = (uint16)p->buffer[0];

   402

		p->size += (uint16)p->buffer[1] << 8;

   403

		// Put the position on the right place

   404

		p->pos = 2;

   405

		p->next = NULL;

   406

   407

		// Handle the packet

   408

		NetworkHandleUDPPacket(p, &client_addr);

   409

   410

		// Free the packet

   411

		free(p);

   412

		p = NULL;

   413

	}

   414

}

   415

   416

// Broadcast to all ips

   417

void NetworkUDPBroadCast(SOCKET udp)

   418

{

   419

	int i;

   420

	struct sockaddr_in out_addr;

   421

	byte *bcptr;

   422

	uint32 bcaddr;

   423

	Packet *p;

   424

   425

	// Init the packet

   426

	p = NetworkSend_Init(PACKET_UDP_CLIENT_FIND_SERVER);

   427

   428

	// Go through all the ips on this pc

   429

	i = 0;

   430

	while (_network_ip_list[i] != 0) {

   431

		bcaddr = _network_ip_list[i];

   432

		bcptr = (byte *)&bcaddr;

   433

		// Make the address a broadcast address

   434

		bcptr[3] = 255;

   435

   436

		DEBUG(net, 6)("[NET][UDP] Broadcasting to %s", inet_ntoa(*(struct in_addr *)&bcaddr));

   437

   438

		out_addr.sin_family = AF_INET;

   439

		out_addr.sin_port = htons(_network_server_port);

   440

		out_addr.sin_addr.s_addr = bcaddr;

   441

   442

		NetworkSendUDP_Packet(udp, p, &out_addr);

   443

   444

		i++;

   445

	}

   446

}

   447

   448

   449

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

   450

void NetworkUDPQueryMasterServer(void)

   451

{

   452

	struct sockaddr_in out_addr;

   453

	Packet *p;

   454

   455

	if (_udp_client_socket == INVALID_SOCKET)

   456

		if (!NetworkUDPListen(&_udp_client_socket, 0, 0, true))

   457

			return;

   458

   459

	p = NetworkSend_Init(PACKET_UDP_CLIENT_GET_LIST);

   460

   461

	out_addr.sin_family = AF_INET;

   462

	out_addr.sin_port = htons(NETWORK_MASTER_SERVER_PORT);

   463

	out_addr.sin_addr.s_addr = NetworkResolveHost(NETWORK_MASTER_SERVER_HOST);

   464

   465

	// packet only contains protocol version

   466

	NetworkSend_uint8(p, NETWORK_MASTER_SERVER_VERSION);

   467

   468

	NetworkSendUDP_Packet(_udp_client_socket, p, &out_addr);

   469

   470

	DEBUG(net, 2)("[NET][UDP] Queried Master Server at %s:%d", inet_ntoa(out_addr.sin_addr),ntohs(out_addr.sin_port));

   471

   472

	free(p);

   473

}

   474

   475

// Find all servers

   476

void NetworkUDPSearchGame(void)

   477

{

   478

	// We are still searching..

   479

	if (_network_udp_broadcast > 0)

   480

		return;

   481

   482

	// No UDP-socket yet..

   483

	if (_udp_client_socket == INVALID_SOCKET)

   484

		if (!NetworkUDPListen(&_udp_client_socket, 0, 0, true))

   485

			return;

   486

   487

	DEBUG(net, 0)("[NET][UDP] Searching server");

   488

   489

	NetworkUDPBroadCast(_udp_client_socket);

   490

	_network_udp_broadcast = 300; // Stay searching for 300 ticks

   491

}

   492

   493

NetworkGameList *NetworkUDPQueryServer(const byte* host, unsigned short port)

   494

{

   495

	struct sockaddr_in out_addr;

   496

	Packet *p;

   497

	NetworkGameList *item;

   498

	char hostname[NETWORK_HOSTNAME_LENGTH];

   499

   500

	// No UDP-socket yet..

   501

	if (_udp_client_socket == INVALID_SOCKET)

   502

		if (!NetworkUDPListen(&_udp_client_socket, 0, 0, true))

   503

			return NULL;

   504

   505

	ttd_strlcpy(hostname, host, sizeof(hostname));

   506

   507

	out_addr.sin_family = AF_INET;

   508

	out_addr.sin_port = htons(port);

   509

	out_addr.sin_addr.s_addr = NetworkResolveHost(host);