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"

    35

#include "network_gui.h"

    36

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

    37

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

    38

#include "../md5.h"

    39

    40

#ifdef __MORPHOS__

    41

// the library base is required here

    42

struct Library *SocketBase = NULL;

    43

#endif

    44

    45

// The listen socket for the server

    46

static SOCKET _listensocket;

    47

    48

// The amount of clients connected

    49

static byte _network_clients_connected = 0;

    50

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

    51

static uint16 _network_client_index = NETWORK_SERVER_INDEX + 1;

    52

    53

/* Some externs / forwards */

    54

extern void StateGameLoop(void);

    55

    56

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

    57

NetworkClientInfo *NetworkFindClientInfoFromIndex(uint16 client_index)

    58

{

    59

	NetworkClientInfo *ci;

    60

    61

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

    62

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

    63

	}

    64

    65

	return NULL;

    66

}

    67

    68

/** Return the CI for a given IP

    69

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

    70

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

    71

NetworkClientInfo *NetworkFindClientInfoFromIP(const char *ip)

    72

{

    73

	NetworkClientInfo *ci;

    74

	uint32 ip_number = inet_addr(ip);

    75

    76

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

    77

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

    78

	}

    79

    80

	return NULL;

    81

}

    82

    83

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

    84

NetworkClientState *NetworkFindClientStateFromIndex(uint16 client_index)

    85

{

    86

	NetworkClientState *cs;

    87

    88

	for (cs = _clients; cs != &_clients[MAX_CLIENT_INFO]; cs++) {

    89

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

    90

	}

    91

    92

	return NULL;

    93

}

    94

    95

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

    96

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

    97

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

    98

{

    99

	const NetworkClientInfo *ci = DEREF_CLIENT_INFO(cs);

   100

   101

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

   102

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

   103

	} else {

   104

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

   105

	}

   106

}

   107

   108

byte NetworkSpectatorCount(void)

   109

{

   110

	const NetworkClientState *cs;

   111

	byte count = 0;

   112

   113

	FOR_ALL_CLIENTS(cs) {

   114

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

   115

	}

   116

   117

	return count;

   118

}

   119

   120

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

   121

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

   122

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

   123

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

   124

{

   125

	char buf[1024];

   126

	va_list va;

   127

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

   128

	char message[1024];

   129

	char temp[1024];

   130

   131

	va_start(va, str);

   132

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

   133

	va_end(va);

   134

   135

	switch (action) {

   136

		case NETWORK_ACTION_SERVER_MESSAGE:

   137

			color = 1;

   138

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

   139

			break;

   140

		case NETWORK_ACTION_JOIN:

   141

			color = 1;

   142

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

   143

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

   144

			break;

   145

		case NETWORK_ACTION_LEAVE:

   146

			color = 1;

   147

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

   148

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

   149

			break;

   150

		case NETWORK_ACTION_GIVE_MONEY:

   151

			if (self_send) {

   152

				SetDParamStr(0, name);

   153

				SetDParam(1, atoi(buf));

   154

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

   155

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

   156

			} else {

   157

				SetDParam(0, atoi(buf));

   158

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

   159

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

   160

			}

   161

			break;

   162

		case NETWORK_ACTION_NAME_CHANGE:

   163

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

   164

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

   165

			break;

   166

		case NETWORK_ACTION_CHAT_COMPANY:

   167

			SetDParamStr(0, name);

   168

			SetDParamStr(1, buf);

   169

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

   170

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

   171

			break;

   172

		case NETWORK_ACTION_CHAT_CLIENT:

   173

			SetDParamStr(0, name);

   174

			SetDParamStr(1, buf);

   175

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

   176

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

   177

			break;

   178

		default:

   179

			SetDParamStr(0, name);

   180

			SetDParamStr(1, buf);

   181

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

   182

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

   183

			break;

   184

	}

   185

   186

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

   187

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

   188

}

   189

   190

// Calculate the frame-lag of a client

   191

uint NetworkCalculateLag(const NetworkClientState *cs)

   192

{

   193

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

   194

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

   195

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

   196

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

   197

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

   198

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

   199

   200

	return lag;

   201

}

   202

   203

   204

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

   205

//  error

   206

static void NetworkError(StringID error_string)

   207

{

   208

	_switch_mode = SM_MENU;

   209

	_switch_mode_errorstr = error_string;

   210

}

   211

   212

static void ClientStartError(const char *error)

   213

{

   214

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

   215

	NetworkError(STR_NETWORK_ERR_CLIENT_START);

   216

}

   217

   218

static void ServerStartError(const char *error)

   219

{

   220

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

   221

	NetworkError(STR_NETWORK_ERR_SERVER_START);

   222

}

   223

   224

static void NetworkClientError(NetworkRecvStatus res, NetworkClientState* cs)

   225

{

   226

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

   227

	//  disconnection (and why!)

   228

	NetworkErrorCode errorno;

   229

   230

	// We just want to close the connection..

   231

	if (res == NETWORK_RECV_STATUS_CLOSE_QUERY) {

   232

		cs->has_quit = true;

   233

		NetworkCloseClient(cs);

   234

		_networking = false;

   235

   236

		DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0);

   237

		return;

   238

	}

   239

   240

	switch (res) {

   241

		case NETWORK_RECV_STATUS_DESYNC:   errorno = NETWORK_ERROR_DESYNC; break;

   242

		case NETWORK_RECV_STATUS_SAVEGAME: errorno = NETWORK_ERROR_SAVEGAME_FAILED; break;

   243

		default:                           errorno = NETWORK_ERROR_GENERAL; break;

   244

	}

   245

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

   246

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

   247

			res != NETWORK_RECV_STATUS_SERVER_BANNED) {

   248

		SEND_COMMAND(PACKET_CLIENT_ERROR)(errorno);

   249

   250

		// Dequeue all commands before closing the socket

   251

		NetworkSend_Packets(DEREF_CLIENT(0));

   252

	}

   253

   254

	_switch_mode = SM_MENU;

   255

	NetworkCloseClient(cs);

   256

	_networking = false;

   257

}

   258

   259

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

   260

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

   261

 * @param err NetworkErrorCode

   262

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

   263

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

   264

{

   265

	/* List of possible network errors, used by

   266

	 * PACKET_SERVER_ERROR and PACKET_CLIENT_ERROR */

   267

	static const StringID network_error_strings[] = {

   268

		STR_NETWORK_ERR_CLIENT_GENERAL,

   269

		STR_NETWORK_ERR_CLIENT_DESYNC,

   270

		STR_NETWORK_ERR_CLIENT_SAVEGAME,

   271

		STR_NETWORK_ERR_CLIENT_CONNECTION_LOST,

   272

		STR_NETWORK_ERR_CLIENT_PROTOCOL_ERROR,

   273

		STR_NETWORK_ERR_CLIENT_NOT_AUTHORIZED,

   274

		STR_NETWORK_ERR_CLIENT_NOT_EXPECTED,

   275

		STR_NETWORK_ERR_CLIENT_WRONG_REVISION,

   276

		STR_NETWORK_ERR_CLIENT_NAME_IN_USE,

   277

		STR_NETWORK_ERR_CLIENT_WRONG_PASSWORD,

   278

		STR_NETWORK_ERR_CLIENT_PLAYER_MISMATCH,

   279

		STR_NETWORK_ERR_CLIENT_KICKED,

   280

		STR_NETWORK_ERR_CLIENT_CHEATER,

   281

		STR_NETWORK_ERR_CLIENT_SERVER_FULL

   282

	};

   283

   284

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

   285

   286

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

   287

}

   288

   289

/* Count the number of active clients connected */

   290

static uint NetworkCountPlayers(void)

   291

{

   292

	const NetworkClientState *cs;

   293

	uint count = 0;

   294

   295

	FOR_ALL_CLIENTS(cs) {

   296

		const NetworkClientInfo *ci = DEREF_CLIENT_INFO(cs);

   297

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

   298

	}

   299

   300

	return count;

   301

}

   302

   303

static bool _min_players_paused = false;

   304

   305

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

   306

void CheckMinPlayers(void)

   307

{

   308

	if (!_network_dedicated) return;

   309

   310

	if (NetworkCountPlayers() < _network_min_players) {

   311

		if (_min_players_paused) return;

   312

   313

		_min_players_paused = true;

   314

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

   315

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

   316

	} else {

   317

		if (!_min_players_paused) return;

   318

   319

		_min_players_paused = false;

   320

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

   321

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

   322

	}

   323

}

   324

   325

// Find all IP-aliases for this host

   326

static void NetworkFindIPs(void)

   327

{

   328

	int i;

   329

   330

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

   331

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

   332

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

   333

   334

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

   335

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

   336

		if (new_pos == 0) {

   337

			return B_ERROR;

   338

		}

   339

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

   340

		return B_OK;

   341

	}

   342

   343

	int output_length;

   344

	char *output_pointer = NULL;

   345

	char **output;

   346

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

   347

	i = 0;

   348

   349

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

   350

	_broadcast_list[0] = 0;

   351

   352

	if (sock < 0) {

   353

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

   354

		return;

   355

	}

   356

   357

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

   358

	if (output_length < 0) {

   359

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

   360

		return;

   361

	}

   362

   363

	output = &output_pointer;

   364

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

   365

		for (;;) {

   366

			uint32 n, fields, read;

   367

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

   368

			struct in_addr inaddr;

   369

			uint32 ip;

   370

			uint32 netmask;

   371

   372

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

   373

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

   374

			read += 1;

   375

			if (fields != 9) {

   376

				break;

   377

			}

   378

   379

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

   380

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

   381

   382

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

   383

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

   384

				_broadcast_list[i] = inaddr.s_addr;

   385

				i++;

   386

			}

   387

			if (read < 0) {

   388

				break;

   389

			}

   390

			*output += read;

   391

		}

   392

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

   393

		/*free(output_pointer);*/

   394

		/*free(output);*/

   395

		closesocket(sock);

   396

	}

   397

#elif defined(HAVE_GETIFADDRS)

   398

	struct ifaddrs *ifap, *ifa;

   399

   400

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

   401

	_broadcast_list[0] = 0;

   402

   403

	if (getifaddrs(&ifap) != 0)

   404

		return;

   405

   406

	i = 0;

   407

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

   408

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

   409

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

   410

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

   411

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

   412

		i++;

   413

	}

   414

	freeifaddrs(ifap);

   415

   416

#else /* not HAVE_GETIFADDRS */

   417

	SOCKET sock;

   418

#ifdef WIN32

   419

	DWORD len = 0;

   420

	INTERFACE_INFO ifo[MAX_INTERFACES];

   421

	uint j;

   422

#else

   423

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

   424

	struct ifconf ifconf;

   425

	const char* buf_end;

   426

	const char* p;

   427

#endif

   428

   429

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

   430

	_broadcast_list[0] = 0;

   431

   432

	sock = socket(AF_INET, SOCK_DGRAM, 0);

   433

	if (sock == INVALID_SOCKET) return;

   434

   435

#ifdef WIN32

   436

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

   437

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

   438

		closesocket(sock);

   439

		return;

   440

	}

   441

   442

	i = 0;

   443

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

   444

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

   445

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

   446

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

   447

		 * 255.255.255.255.

   448

		 */

   449

		_broadcast_list[i++] =

   450

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

   451

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

   452

	}

   453

#else

   454

	ifconf.ifc_len = sizeof(buf);

   455

	ifconf.ifc_buf = buf;

   456

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

   457

		closesocket(sock);

   458

		return;

   459

	}

   460

   461

	i = 0;

   462

	buf_end = buf + ifconf.ifc_len;

   463

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

   464

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

   465

   466

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

   467

			struct ifreq r;

   468

   469

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

   470

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

   471

					r.ifr_flags & IFF_BROADCAST &&

   472

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

   473

				_broadcast_list[i++] =

   474

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

   475

			}

   476

		}

   477

   478

		p += sizeof(struct ifreq);

   479

#ifdef AF_LINK

   480

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

   481

#endif

   482

	}

   483

#endif

   484

   485

	closesocket(sock);

   486

#endif /* not HAVE_GETIFADDRS */

   487

   488

	_broadcast_list[i] = 0;

   489

   490

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

   491

	// Now display to the debug all the detected ips

   492

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

   493

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

   494

	}

   495

}

   496

   497

// Resolve a hostname to a inet_addr

   498

unsigned long NetworkResolveHost(const char *hostname)

   499

{

   500

	in_addr_t ip;

   501

   502

	// First try: is it an ip address?

   503

	ip = inet_addr(hostname);

   504

   505

	// If not try to resolve the name

   506

	if (ip == INADDR_NONE) {

   507

		struct hostent *he = gethostbyname(hostname);

   508

		if (he == NULL) {

   509

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

   510

		} else {

   511

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

   512

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

   513

			ip = addr.s_addr;

   514

		}

   515

	}

   516

	return ip;

   517

}

   518

   519

// Converts a string to ip/port/player

   520

//  Format: IP#player:port

   521

//

   522

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

   523

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

   524

// occupied by connection_string.

   525

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

   526

{

   527

	char *p;

   528

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

   529

		if (*p == '#') {

   530

			*p = '\0';