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 "table/strings.h"

    28

#include "network_client.h"

    29

#include "network_server.h"

    30

#include "network_udp.h"

    31

#include "network_gamelist.h"

    32

#include "network_gui.h"

    33

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

    34

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

    35

#include "md5.h"

    36

    37

#ifdef __MORPHOS__

    38

// the library base is required here

    39

struct Library *SocketBase = NULL;

    40

#endif

    41

    42

// The listen socket for the server

    43

static SOCKET _listensocket;

    44

    45

// The amount of clients connected

    46

static byte _network_clients_connected = 0;

    47

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

    48

static uint16 _network_client_index = NETWORK_SERVER_INDEX + 1;

    49

    50

/* Some externs / forwards */

    51

extern void StateGameLoop(void);

    52

    53

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

    54

NetworkClientInfo *NetworkFindClientInfoFromIndex(uint16 client_index)

    55

{

    56

	NetworkClientInfo *ci;

    57

    58

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

    59

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

    60

	}

    61

    62

	return NULL;

    63

}

    64

    65

/** Return the CI for a given IP

    66

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

    67

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

    68

NetworkClientInfo *NetworkFindClientInfoFromIP(const char *ip)

    69

{

    70

	NetworkClientInfo *ci;

    71

	uint32 ip_number = inet_addr(ip);

    72

    73

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

    74

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

    75

	}

    76

    77

	return NULL;

    78

}

    79

    80

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

    81

NetworkClientState *NetworkFindClientStateFromIndex(uint16 client_index)

    82

{

    83

	NetworkClientState *cs;

    84

    85

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

    86

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

    87

	}

    88

    89

	return NULL;

    90

}

    91

    92

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

    93

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

    94

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

    95

{

    96

	const NetworkClientInfo *ci = DEREF_CLIENT_INFO(cs);

    97

    98

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

    99

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

   100

	} else {

   101

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

   102

	}

   103

}

   104

   105

byte NetworkSpectatorCount(void)

   106

{

   107

	const NetworkClientState *cs;

   108

	byte count = 0;

   109

   110

	FOR_ALL_CLIENTS(cs) {

   111

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

   112

	}

   113

   114

	return count;

   115

}

   116

   117

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

   118

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

   119

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

   120

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

   121

{

   122

	char buf[1024];

   123

	va_list va;

   124

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

   125

	char message[1024];

   126

	char temp[1024];

   127

   128

	va_start(va, str);

   129

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

   130

	va_end(va);

   131

   132

	switch (action) {

   133

		case NETWORK_ACTION_SERVER_MESSAGE:

   134

			color = 1;

   135

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

   136

			break;

   137

		case NETWORK_ACTION_JOIN:

   138

			color = 1;

   139

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

   140

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

   141

			break;

   142

		case NETWORK_ACTION_LEAVE:

   143

			color = 1;

   144

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

   145

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

   146

			break;

   147

		case NETWORK_ACTION_GIVE_MONEY:

   148

			if (self_send) {

   149

				SetDParamStr(0, name);

   150

				SetDParam(1, atoi(buf));

   151

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

   152

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

   153

			} else {

   154

				SetDParam(0, atoi(buf));

   155

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

   156

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

   157

			}

   158

			break;

   159

		case NETWORK_ACTION_NAME_CHANGE:

   160

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

   161

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

   162

			break;

   163

		case NETWORK_ACTION_CHAT_COMPANY:

   164

			SetDParamStr(0, name);

   165

			SetDParamStr(1, buf);

   166

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

   167

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

   168

			break;

   169

		case NETWORK_ACTION_CHAT_CLIENT:

   170

			SetDParamStr(0, name);

   171

			SetDParamStr(1, buf);

   172

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

   173

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

   174

			break;

   175

		default:

   176

			SetDParamStr(0, name);

   177

			SetDParamStr(1, buf);

   178

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

   179

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

   180

			break;

   181

	}

   182

   183

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

   184

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

   185

}

   186

   187

// Calculate the frame-lag of a client

   188

uint NetworkCalculateLag(const NetworkClientState *cs)

   189

{

   190

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

   191

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

   192

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

   193

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

   194

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

   195

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

   196

   197

	return lag;

   198

}

   199

   200

   201

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

   202

//  error

   203

static void NetworkError(StringID error_string)

   204

{

   205

	_switch_mode = SM_MENU;

   206

	_switch_mode_errorstr = error_string;

   207

}

   208

   209

static void ClientStartError(const char *error)

   210

{

   211

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

   212

	NetworkError(STR_NETWORK_ERR_CLIENT_START);

   213

}

   214

   215

static void ServerStartError(const char *error)

   216

{

   217

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

   218

	NetworkError(STR_NETWORK_ERR_SERVER_START);

   219

}

   220

   221

static void NetworkClientError(NetworkRecvStatus res, NetworkClientState* cs)

   222

{

   223

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

   224

	//  disconnection (and why!)

   225

	NetworkErrorCode errorno;

   226

   227

	// We just want to close the connection..

   228

	if (res == NETWORK_RECV_STATUS_CLOSE_QUERY) {

   229

		cs->has_quit = true;

   230

		NetworkCloseClient(cs);

   231

		_networking = false;

   232

   233

		DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0);

   234

		return;

   235

	}

   236

   237

	switch (res) {

   238

		case NETWORK_RECV_STATUS_DESYNC:   errorno = NETWORK_ERROR_DESYNC; break;

   239

		case NETWORK_RECV_STATUS_SAVEGAME: errorno = NETWORK_ERROR_SAVEGAME_FAILED; break;

   240

		default:                           errorno = NETWORK_ERROR_GENERAL; break;

   241

	}

   242

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

   243

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

   244

			res != NETWORK_RECV_STATUS_SERVER_BANNED) {

   245

		SEND_COMMAND(PACKET_CLIENT_ERROR)(errorno);

   246

   247

		// Dequeue all commands before closing the socket

   248

		NetworkSend_Packets(DEREF_CLIENT(0));

   249

	}

   250

   251

	_switch_mode = SM_MENU;

   252

	NetworkCloseClient(cs);

   253

	_networking = false;

   254

}

   255

   256

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

   257

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

   258

 * @param err NetworkErrorCode

   259

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

   260

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

   261

{

   262

	/* List of possible network errors, used by

   263

	 * PACKET_SERVER_ERROR and PACKET_CLIENT_ERROR */

   264

	static const StringID network_error_strings[] = {

   265

		STR_NETWORK_ERR_CLIENT_GENERAL,

   266

		STR_NETWORK_ERR_CLIENT_DESYNC,

   267

		STR_NETWORK_ERR_CLIENT_SAVEGAME,

   268

		STR_NETWORK_ERR_CLIENT_CONNECTION_LOST,

   269

		STR_NETWORK_ERR_CLIENT_PROTOCOL_ERROR,

   270

		STR_NETWORK_ERR_CLIENT_NOT_AUTHORIZED,

   271

		STR_NETWORK_ERR_CLIENT_NOT_EXPECTED,

   272

		STR_NETWORK_ERR_CLIENT_WRONG_REVISION,

   273

		STR_NETWORK_ERR_CLIENT_NAME_IN_USE,

   274

		STR_NETWORK_ERR_CLIENT_WRONG_PASSWORD,

   275

		STR_NETWORK_ERR_CLIENT_PLAYER_MISMATCH,

   276

		STR_NETWORK_ERR_CLIENT_KICKED,

   277

		STR_NETWORK_ERR_CLIENT_CHEATER,

   278

		STR_NETWORK_ERR_CLIENT_SERVER_FULL

   279

	};

   280

   281

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

   282

   283

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

   284

}

   285

   286

/* Count the number of active clients connected */

   287

static uint NetworkCountPlayers(void)

   288

{

   289

	const NetworkClientState *cs;

   290

	uint count = 0;

   291

   292

	FOR_ALL_CLIENTS(cs) {

   293

		const NetworkClientInfo *ci = DEREF_CLIENT_INFO(cs);

   294

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

   295

	}

   296

   297

	return count;

   298

}

   299

   300

static bool _min_players_paused = false;

   301

   302

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

   303

void CheckMinPlayers(void)

   304

{

   305

	if (!_network_dedicated) return;

   306

   307

	if (NetworkCountPlayers() < _network_min_players) {

   308

		if (_min_players_paused) return;

   309

   310

		_min_players_paused = true;

   311

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

   312

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

   313

	} else {

   314

		if (!_min_players_paused) return;

   315

   316

		_min_players_paused = false;

   317

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

   318

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

   319

	}

   320

}

   321

   322

// Find all IP-aliases for this host

   323

static void NetworkFindIPs(void)

   324

{

   325

	int i;

   326

   327

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

   328

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

   329

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

   330

   331

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

   332

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

   333

		if (new_pos == 0) {

   334

			return B_ERROR;

   335

		}

   336

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

   337

		return B_OK;

   338

	}

   339

   340

	int output_length;

   341

	char *output_pointer = NULL;

   342

	char **output;

   343

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

   344

	i = 0;

   345

   346

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

   347

	_broadcast_list[0] = 0;

   348

   349

	if (sock < 0) {

   350

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

   351

		return;

   352

	}

   353

   354

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

   355

	if (output_length < 0) {

   356

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

   357

		return;

   358

	}

   359

   360

	output = &output_pointer;

   361

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

   362

		for (;;) {

   363

			uint32 n, fields, read;

   364

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

   365

			struct in_addr inaddr;

   366

			uint32 ip;

   367

			uint32 netmask;

   368

   369

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

   370

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

   371

			read += 1;

   372

			if (fields != 9) {

   373

				break;

   374

			}

   375

   376

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

   377

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

   378

   379

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

   380

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

   381

				_broadcast_list[i] = inaddr.s_addr;

   382

				i++;

   383

			}

   384

			if (read < 0) {

   385

				break;

   386

			}

   387

			*output += read;

   388

		}

   389

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

   390

		/*free(output_pointer);*/

   391

		/*free(output);*/

   392

		closesocket(sock);

   393

	}

   394

#elif defined(HAVE_GETIFADDRS)

   395

	struct ifaddrs *ifap, *ifa;

   396

   397

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

   398

	_broadcast_list[0] = 0;

   399

   400

	if (getifaddrs(&ifap) != 0)

   401

		return;

   402

   403

	i = 0;

   404

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

   405

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

   406

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

   407

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

   408

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

   409

		i++;

   410

	}

   411

	freeifaddrs(ifap);

   412

   413

#else /* not HAVE_GETIFADDRS */

   414

	SOCKET sock;

   415

#ifdef WIN32

   416

	DWORD len = 0;

   417

	INTERFACE_INFO ifo[MAX_INTERFACES];

   418

	uint j;

   419

#else

   420

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

   421

	struct ifconf ifconf;

   422

	const char* buf_end;

   423

	const char* p;

   424

#endif

   425

   426

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

   427

	_broadcast_list[0] = 0;

   428

   429

	sock = socket(AF_INET, SOCK_DGRAM, 0);

   430

	if (sock == INVALID_SOCKET) return;

   431

   432

#ifdef WIN32

   433

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

   434

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

   435

		closesocket(sock);

   436

		return;

   437

	}

   438

   439

	i = 0;

   440

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

   441

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

   442

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

   443

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

   444

		 * 255.255.255.255.

   445

		 */

   446

		_broadcast_list[i++] =

   447

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

   448

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

   449

	}

   450

#else

   451

	ifconf.ifc_len = sizeof(buf);

   452

	ifconf.ifc_buf = buf;

   453

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

   454

		closesocket(sock);

   455

		return;

   456

	}

   457

   458

	i = 0;

   459

	buf_end = buf + ifconf.ifc_len;

   460

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

   461

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

   462

   463

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

   464

			struct ifreq r;

   465

   466

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

   467

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

   468

					r.ifr_flags & IFF_BROADCAST &&

   469

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

   470

				_broadcast_list[i++] =

   471

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

   472

			}

   473

		}

   474

   475

		p += sizeof(struct ifreq);

   476

#ifdef AF_LINK

   477

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

   478

#endif

   479

	}

   480

#endif

   481

   482

	closesocket(sock);

   483

#endif /* not HAVE_GETIFADDRS */

   484

   485

	_broadcast_list[i] = 0;

   486