1

/* $Id$ */

     2

     3

#include "../stdafx.h"

     4

#include "network_data.h"

     5

     6

#if defined(WITH_REV)

     7

	extern const char _openttd_revision[];

     8

#elif defined(WITH_REV_HACK)

     9

	#define WITH_REV

    10

	const char _openttd_revision[] = WITH_REV_HACK;

    11

#else

    12

	const char _openttd_revision[] = NOREV_STRING;

    13

#endif

    14

    15

    16

#ifdef ENABLE_NETWORK

    17

    18

#include "../openttd.h"

    19

#include "../debug.h"

    20

#include "../functions.h"

    21

#include "../string.h"

    22

#include "../strings.h"

    23

#include "../map.h"

    24

#include "../command.h"

    25

#include "../variables.h"

    26

#include "../date.h"

    27

#include "../newgrf_config.h"

    28

#include "table/strings.h"

    29

#include "network_client.h"

    30

#include "network_server.h"

    31

#include "network_udp.h"

    32

#include "network_gamelist.h"

    33

#include "core/udp.h"

    34

#include "core/tcp.h"

    36

#include "network_gui.h"

    37

#include "../console.h" /* IConsoleCmdExec */

    38

#include <stdarg.h> /* va_list */

    39

#include "../md5.h"

    40

    41

// The listen socket for the server

    42

static SOCKET _listensocket;

    43

    44

// The amount of clients connected

    45

static byte _network_clients_connected = 0;

    46

// The index counter for new clients (is never decreased)

    47

static uint16 _network_client_index = NETWORK_SERVER_INDEX + 1;

    48

    49

/* Some externs / forwards */

    50

extern void StateGameLoop(void);

    51

    52

// Function that looks up the CI for a given client-index

    53

NetworkClientInfo *NetworkFindClientInfoFromIndex(uint16 client_index)

    54

{

    55

	NetworkClientInfo *ci;

    56

    57

	for (ci = _network_client_info; ci != endof(_network_client_info); ci++) {

    58

		if (ci->client_index == client_index) return ci;

    59

	}

    60

    61

	return NULL;

    62

}

    63

    64

/** Return the CI for a given IP

    65

 * @param ip IP of the client we are looking for. This must be in string-format

    66

 * @return return a pointer to the corresponding NetworkClientInfo struct or NULL on failure */

    67

NetworkClientInfo *NetworkFindClientInfoFromIP(const char *ip)

    68

{

    69

	NetworkClientInfo *ci;

    70

	uint32 ip_number = inet_addr(ip);

    71

    72

	for (ci = _network_client_info; ci != endof(_network_client_info); ci++) {

    73

		if (ci->client_ip == ip_number) return ci;

    74

	}

    75

    76

	return NULL;

    77

}

    78

    79

// Function that looks up the CS for a given client-index

    80

NetworkClientState *NetworkFindClientStateFromIndex(uint16 client_index)

    81

{

    82

	NetworkClientState *cs;

    83

    85

		if (cs->index == client_index) return cs;

    86

	}

    87

    88

	return NULL;

    89

}

    90

    91

// NetworkGetClientName is a server-safe function to get the name of the client

    92

//  if the user did not send it yet, Client #<no> is used.

    93

void NetworkGetClientName(char *client_name, size_t size, const NetworkClientState *cs)

    94

{

    95

	const NetworkClientInfo *ci = DEREF_CLIENT_INFO(cs);

    96

    97

	if (ci->client_name[0] == '\0') {

    98

		snprintf(client_name, size, "Client #%4d", cs->index);

    99

	} else {

   100

		ttd_strlcpy(client_name, ci->client_name, size);

   101

	}

   102

}

   103

   104

byte NetworkSpectatorCount(void)

   105

{

   106

	const NetworkClientState *cs;

   107

	byte count = 0;

   108

   109

	FOR_ALL_CLIENTS(cs) {

   110

		if (DEREF_CLIENT_INFO(cs)->client_playas == PLAYER_SPECTATOR) count++;

   111

	}

   112

   113

	return count;

   114

}

   115

   116

// This puts a text-message to the console, or in the future, the chat-box,

   117

//  (to keep it all a bit more general)

   118

// If 'self_send' is true, this is the client who is sending the message

   119

void CDECL NetworkTextMessage(NetworkAction action, uint16 color, bool self_send, const char *name, const char *str, ...)

   120

{

   121

	char buf[1024];

   122

	va_list va;

   123

	const int duration = 10; // Game days the messages stay visible

   124

	char message[1024];

   125

	char temp[1024];

   126

   127

	va_start(va, str);

   128

	vsnprintf(buf, lengthof(buf), str, va);

   129

	va_end(va);

   130

   131

	switch (action) {

   132

		case NETWORK_ACTION_SERVER_MESSAGE:

   133

			color = 1;

   134

			snprintf(message, sizeof(message), "*** %s", buf);

   135

			break;

   136

		case NETWORK_ACTION_JOIN:

   137

			color = 1;

   138

			GetString(temp, STR_NETWORK_CLIENT_JOINED, lastof(temp));

   139

			snprintf(message, sizeof(message), "*** %s %s", name, temp);

   140

			break;

   141

		case NETWORK_ACTION_LEAVE:

   142

			color = 1;

   143

			GetString(temp, STR_NETWORK_ERR_LEFT, lastof(temp));

   144

			snprintf(message, sizeof(message), "*** %s %s (%s)", name, temp, buf);

   145

			break;

   146

		case NETWORK_ACTION_GIVE_MONEY:

   147

			if (self_send) {

   148

				SetDParamStr(0, name);

   149

				SetDParam(1, atoi(buf));

   150

				GetString(temp, STR_NETWORK_GAVE_MONEY_AWAY, lastof(temp));

   151

				snprintf(message, sizeof(message), "*** %s", temp);

   152

			} else {

   153

				SetDParam(0, atoi(buf));

   154

				GetString(temp, STR_NETWORK_GIVE_MONEY, lastof(temp));

   155

				snprintf(message, sizeof(message), "*** %s %s", name, temp);

   156

			}

   157

			break;

   158

		case NETWORK_ACTION_NAME_CHANGE:

   159

			GetString(temp, STR_NETWORK_NAME_CHANGE, lastof(temp));

   160

			snprintf(message, sizeof(message), "*** %s %s %s", name, temp, buf);

   161

			break;

   162

		case NETWORK_ACTION_CHAT_COMPANY:

   163

			SetDParamStr(0, name);

   164

			SetDParamStr(1, buf);

   165

			GetString(temp, self_send ? STR_NETWORK_CHAT_TO_COMPANY : STR_NETWORK_CHAT_COMPANY, lastof(temp));

   166

			ttd_strlcpy(message, temp, sizeof(message));

   167

			break;

   168

		case NETWORK_ACTION_CHAT_CLIENT:

   169

			SetDParamStr(0, name);

   170

			SetDParamStr(1, buf);

   171

			GetString(temp, self_send ? STR_NETWORK_CHAT_TO_CLIENT : STR_NETWORK_CHAT_CLIENT, lastof(temp));

   172

			ttd_strlcpy(message, temp, sizeof(message));

   173

			break;

   174

		default:

   175

			SetDParamStr(0, name);

   176

			SetDParamStr(1, buf);

   177

			GetString(temp, STR_NETWORK_CHAT_ALL, lastof(temp));

   178

			ttd_strlcpy(message, temp, sizeof(message));

   179

			break;

   180

	}

   181

   182

	IConsolePrintF(color, "%s", message);

   183

	AddTextMessage(color, duration, "%s", message);

   184

}

   185

   186

// Calculate the frame-lag of a client

   187

uint NetworkCalculateLag(const NetworkClientState *cs)

   188

{

   189

	int lag = cs->last_frame_server - cs->last_frame;

   190

	// This client has missed his ACK packet after 1 DAY_TICKS..

   191

	//  so we increase his lag for every frame that passes!

   192

	// The packet can be out by a max of _net_frame_freq

   193

	if (cs->last_frame_server + DAY_TICKS + _network_frame_freq < _frame_counter)

   194

		lag += _frame_counter - (cs->last_frame_server + DAY_TICKS + _network_frame_freq);

   195

   196

	return lag;

   197

}

   198

   199

   200

// There was a non-recoverable error, drop back to the main menu with a nice

   201

//  error

   202

static void NetworkError(StringID error_string)

   203

{

   204

	_switch_mode = SM_MENU;

   205

	_switch_mode_errorstr = error_string;

   206

}

   207

   208

static void ClientStartError(const char *error)

   209

{

   210

	DEBUG(net, 0, "[client] could not start network: %s",error);

   211

	NetworkError(STR_NETWORK_ERR_CLIENT_START);

   212

}

   213

   214

static void ServerStartError(const char *error)

   215

{

   216

	DEBUG(net, 0, "[server] could not start network: %s",error);

   217

	NetworkError(STR_NETWORK_ERR_SERVER_START);

   218

}

   219

   220

static void NetworkClientError(NetworkRecvStatus res, NetworkClientState* cs)

   221

{

   222

	// First, send a CLIENT_ERROR to the server, so he knows we are

   223

	//  disconnection (and why!)

   224

	NetworkErrorCode errorno;

   225

   226

	// We just want to close the connection..

   227

	if (res == NETWORK_RECV_STATUS_CLOSE_QUERY) {

   228

		cs->has_quit = true;

   229

		NetworkCloseClient(cs);

   230

		_networking = false;

   231

   232

		DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0);

   233

		return;

   234

	}

   235

   236

	switch (res) {

   237

		case NETWORK_RECV_STATUS_DESYNC:   errorno = NETWORK_ERROR_DESYNC; break;

   238

		case NETWORK_RECV_STATUS_SAVEGAME: errorno = NETWORK_ERROR_SAVEGAME_FAILED; break;

   239

		default:                           errorno = NETWORK_ERROR_GENERAL; break;

   240

	}

   241

	// This means we fucked up and the server closed the connection

   242

	if (res != NETWORK_RECV_STATUS_SERVER_ERROR && res != NETWORK_RECV_STATUS_SERVER_FULL &&

   243

			res != NETWORK_RECV_STATUS_SERVER_BANNED) {

   244

		SEND_COMMAND(PACKET_CLIENT_ERROR)(errorno);

   245

   246

		// Dequeue all commands before closing the socket

   247

		NetworkSend_Packets(DEREF_CLIENT(0));

   248

	}

   249

   250

	_switch_mode = SM_MENU;

   251

	NetworkCloseClient(cs);

   252

	_networking = false;

   253

}

   254

   255

/** Retrieve a string representation of an internal error number

   256

 * @param buf buffer where the error message will be stored

   257

 * @param err NetworkErrorCode

   258

 * @return returns a pointer to the error message (buf) */

   259

char* GetNetworkErrorMsg(char* buf, NetworkErrorCode err, const char* last)

   260

{

   261

	/* List of possible network errors, used by

   262

	 * PACKET_SERVER_ERROR and PACKET_CLIENT_ERROR */

   263

	static const StringID network_error_strings[] = {

   264

		STR_NETWORK_ERR_CLIENT_GENERAL,

   265

		STR_NETWORK_ERR_CLIENT_DESYNC,

   266

		STR_NETWORK_ERR_CLIENT_SAVEGAME,

   267

		STR_NETWORK_ERR_CLIENT_CONNECTION_LOST,

   268

		STR_NETWORK_ERR_CLIENT_PROTOCOL_ERROR,

   269

		STR_NETWORK_ERR_CLIENT_NOT_AUTHORIZED,

   270

		STR_NETWORK_ERR_CLIENT_NOT_EXPECTED,

   271

		STR_NETWORK_ERR_CLIENT_WRONG_REVISION,

   272

		STR_NETWORK_ERR_CLIENT_NAME_IN_USE,

   273

		STR_NETWORK_ERR_CLIENT_WRONG_PASSWORD,

   274

		STR_NETWORK_ERR_CLIENT_PLAYER_MISMATCH,

   275

		STR_NETWORK_ERR_CLIENT_KICKED,

   276

		STR_NETWORK_ERR_CLIENT_CHEATER,

   277

		STR_NETWORK_ERR_CLIENT_SERVER_FULL

   278

	};

   279

   280

	if (err >= lengthof(network_error_strings)) err = 0;

   281

   282

	return GetString(buf, network_error_strings[err], last);

   283

}

   284

   285

/* Count the number of active clients connected */

   286

static uint NetworkCountPlayers(void)

   287

{

   288

	const NetworkClientState *cs;

   289

	uint count = 0;

   290

   291

	FOR_ALL_CLIENTS(cs) {

   292

		const NetworkClientInfo *ci = DEREF_CLIENT_INFO(cs);

   293

		if (IsValidPlayer(ci->client_playas)) count++;

   294

	}

   295

   296

	return count;

   297

}

   298

   299

static bool _min_players_paused = false;

   300

   301

/* Check if the minimum number of players has been reached and pause or unpause the game as appropriate */

   302

void CheckMinPlayers(void)

   303

{

   304

	if (!_network_dedicated) return;

   305

   306

	if (NetworkCountPlayers() < _network_min_players) {

   307

		if (_min_players_paused) return;

   308

   309

		_min_players_paused = true;

   310

		DoCommandP(0, 1, 0, NULL, CMD_PAUSE);

   311

		NetworkServer_HandleChat(NETWORK_ACTION_SERVER_MESSAGE, DESTTYPE_BROADCAST, 0, "Game paused (not enough players)", NETWORK_SERVER_INDEX);

   312

	} else {

   313

		if (!_min_players_paused) return;

   314

   315

		_min_players_paused = false;

   316

		DoCommandP(0, 0, 0, NULL, CMD_PAUSE);

   317

		NetworkServer_HandleChat(NETWORK_ACTION_SERVER_MESSAGE, DESTTYPE_BROADCAST, 0, "Game unpaused (enough players)", NETWORK_SERVER_INDEX);

   318

	}

   319

}

   320

   321

// Find all IP-aliases for this host

   322

static void NetworkFindIPs(void)

   323

{

   324

	int i;

   325

   326

#if defined(BEOS_NET_SERVER) /* doesn't have neither getifaddrs or net/if.h */

   327

	/* Based on Andrew Bachmann's netstat+.c. Big thanks to him! */

   328

	int _netstat(int fd, char **output, int verbose);

   329

   330

	int seek_past_header(char **pos, const char *header) {

   331

		char *new_pos = strstr(*pos, header);

   332

		if (new_pos == 0) {

   333

			return B_ERROR;

   334

		}

   335

		*pos += strlen(header) + new_pos - *pos + 1;

   336

		return B_OK;

   337

	}

   338

   339

	int output_length;

   340

	char *output_pointer = NULL;

   341

	char **output;

   342

	int sock = socket(AF_INET, SOCK_DGRAM, 0);

   343

	i = 0;

   344

   345

	// If something fails, make sure the list is empty

   346

	_broadcast_list[0] = 0;

   347

   348

	if (sock < 0) {

   349

		DEBUG(net, 0, "[core] error creating socket");

   350

		return;

   351

	}

   352

   353

	output_length = _netstat(sock, &output_pointer, 1);

   354

	if (output_length < 0) {

   355

		DEBUG(net, 0, "[core] error running _netstat");

   356

		return;

   357

	}

   358

   359

	output = &output_pointer;

   360

	if (seek_past_header(output, "IP Interfaces:") == B_OK) {

   361

		for (;;) {

   362

			uint32 n, fields, read;

   363

			uint8 i1, i2, i3, i4, j1, j2, j3, j4;

   364

			struct in_addr inaddr;

   365

			uint32 ip;

   366

			uint32 netmask;

   367

   368

			fields = sscanf(*output, "%u: %hhu.%hhu.%hhu.%hhu, netmask %hhu.%hhu.%hhu.%hhu%n",

   369

												&n, &i1,&i2,&i3,&i4, &j1,&j2,&j3,&j4, &read);

   370

			read += 1;

   371

			if (fields != 9) {

   372

				break;

   373

			}

   374

   375

			ip      = (uint32)i1 << 24 | (uint32)i2 << 16 | (uint32)i3 << 8 | (uint32)i4;

   376

			netmask = (uint32)j1 << 24 | (uint32)j2 << 16 | (uint32)j3 << 8 | (uint32)j4;

   377

   378

			if (ip != INADDR_LOOPBACK && ip != INADDR_ANY) {

   379

				inaddr.s_addr = htonl(ip | ~netmask);

   380

				_broadcast_list[i] = inaddr.s_addr;

   381

				i++;

   382

			}

   383

			if (read < 0) {

   384

				break;

   385

			}

   386

			*output += read;

   387

		}

   388

		/* XXX - Using either one of these crashes openttd heavily? - wber */

   389

		/*free(output_pointer);*/

   390

		/*free(output);*/

   391

		closesocket(sock);

   392

	}

   393

#elif defined(HAVE_GETIFADDRS)

   394

	struct ifaddrs *ifap, *ifa;

   395

   396

	// If something fails, make sure the list is empty

   397

	_broadcast_list[0] = 0;

   398

   399

	if (getifaddrs(&ifap) != 0)

   400

		return;

   401

   402

	i = 0;

   403

	for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {

   404

		if (!(ifa->ifa_flags & IFF_BROADCAST)) continue;

   405

		if (ifa->ifa_broadaddr == NULL) continue;

   406

		if (ifa->ifa_broadaddr->sa_family != AF_INET) continue;

   407

		_broadcast_list[i] = ((struct sockaddr_in*)ifa->ifa_broadaddr)->sin_addr.s_addr;

   408

		i++;

   409

	}

   410

	freeifaddrs(ifap);

   411

   412

#else /* not HAVE_GETIFADDRS */

   413

	SOCKET sock;

   414

#ifdef WIN32

   415

	DWORD len = 0;

   416

	INTERFACE_INFO ifo[MAX_INTERFACES];

   417

	uint j;

   418

#else

   419

	char buf[4 * 1024]; // Arbitrary buffer size

   420

	struct ifconf ifconf;

   421

	const char* buf_end;

   422

	const char* p;

   423

#endif

   424

   425

	// If something fails, make sure the list is empty

   426

	_broadcast_list[0] = 0;

   427

   428

	sock = socket(AF_INET, SOCK_DGRAM, 0);

   429

	if (sock == INVALID_SOCKET) return;

   430

   431

#ifdef WIN32

   432

	memset(&ifo[0], 0, sizeof(ifo));

   433

	if ((WSAIoctl(sock, SIO_GET_INTERFACE_LIST, NULL, 0, &ifo[0], sizeof(ifo), &len, NULL, NULL)) != 0) {

   434

		closesocket(sock);

   435

		return;

   436

	}

   437

   438

	i = 0;

   439

	for (j = 0; j < len / sizeof(*ifo); j++) {

   440

		if (ifo[j].iiFlags & IFF_LOOPBACK) continue;

   441

		if (!(ifo[j].iiFlags & IFF_BROADCAST)) continue;

   442

		/* iiBroadcast is unusable, because it always seems to be set to

   443

		 * 255.255.255.255.

   444

		 */

   445

		_broadcast_list[i++] =

   446

			 ifo[j].iiAddress.AddressIn.sin_addr.s_addr |

   447

			~ifo[j].iiNetmask.AddressIn.sin_addr.s_addr;

   448

	}

   449

#else

   450

	ifconf.ifc_len = sizeof(buf);

   451

	ifconf.ifc_buf = buf;

   452

	if (ioctl(sock, SIOCGIFCONF, &ifconf) == -1) {

   453

		closesocket(sock);

   454

		return;

   455

	}

   456

   457

	i = 0;

   458

	buf_end = buf + ifconf.ifc_len;

   459

	for (p = buf; p < buf_end;) {

   460

		const struct ifreq* req = (const struct ifreq*)p;

   461

   462

		if (req->ifr_addr.sa_family == AF_INET) {

   463

			struct ifreq r;

   464

   465

			strncpy(r.ifr_name, req->ifr_name, lengthof(r.ifr_name));

   466

			if (ioctl(sock, SIOCGIFFLAGS, &r) != -1 &&

   467

					r.ifr_flags & IFF_BROADCAST &&

   468

					ioctl(sock, SIOCGIFBRDADDR, &r) != -1) {

   469

				_broadcast_list[i++] =

   470

					((struct sockaddr_in*)&r.ifr_broadaddr)->sin_addr.s_addr;

   471

			}

   472

		}

   473

   474

		p += sizeof(struct ifreq);

   475

#ifdef AF_LINK

   476

		p += req->ifr_addr.sa_len - sizeof(struct sockaddr);

   477

#endif

   478

	}

   479

#endif

   480

   481

	closesocket(sock);

   482

#endif /* not HAVE_GETIFADDRS */

   483

   484

	_broadcast_list[i] = 0;

   485

   486

	DEBUG(net, 3, "Detected broadcast addresses:");

   487

	// Now display to the debug all the detected ips

   488

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

   489

		DEBUG(net, 3, "%d) %s", i, inet_ntoa(*(struct in_addr *)&_broadcast_list[i]));//inet_ntoa(inaddr));

   490

	}

   491

}

   492

   493

// Resolve a hostname to a inet_addr

   494

unsigned long NetworkResolveHost(const char *hostname)

   495

{

   496

	in_addr_t ip;

   497

   498

	// First try: is it an ip address?

   499

	ip = inet_addr(hostname);

   500

   501

	// If not try to resolve the name

   502

	if (ip == INADDR_NONE) {

   503

		struct hostent *he = gethostbyname(hostname);

   504

		if (he == NULL) {

   505

			DEBUG(net, 0, "Cannot resolve '%s'", hostname);

   506

		} else {

   507

			struct in_addr addr = *(struct in_addr *)he->h_addr_list[0];

   508

			DEBUG(net, 1, "Resolved '%s' to %s", hostname, inet_ntoa(addr));

   509

			ip = addr.s_addr;

   510

		}

   511

	}

   512

	return ip;

   513

}

   514

   515

// Converts a string to ip/port/player

   516

//  Format: IP#player:port

   517

//

   518

// connection_string will be re-terminated to seperate out the hostname, and player and port will

   519

// be set to the player and port strings given by the user, inside the memory area originally

   520

// occupied by connection_string.

   521

void ParseConnectionString(const char **player, const char **port, char *connection_string)

   522

{

   523

	char *p;

   524

	for (p = connection_string; *p != '\0'; p++) {

   525

		if (*p == '#') {

   526

			*p = '\0';

   527

			*player = ++p;

   528

			while (IsValidChar(*p, CS_NUMERAL)) p++;

   529

			if (*p == '\0') break;