1

#include "stdafx.h"

     2

#include "network_data.h"

     3

     4

#ifdef ENABLE_NETWORK

     5

     6

#include "table/strings.h"

     7

#include "network_client.h"

     8

#include "network_server.h"

     9

#include "network_udp.h"

    10

#include "network_gamelist.h"

    11

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

    12

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

    13

#include "md5.h"

    14

    15

// The listen socket for the server

    16

static SOCKET _listensocket;

    17

    18

// Network copy of patches, so the patches of a client are not fucked up

    19

//  after he joined a server

    20

static Patches network_tmp_patches;

    21

    22

// The amount of clients connected

    23

static byte _network_clients_connected = 0;

    24

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

    25

static uint16 _network_client_index = NETWORK_SERVER_INDEX + 1;

    26

    27

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

    28

NetworkClientInfo *NetworkFindClientInfoFromIndex(uint16 client_index)

    29

{

    30

	NetworkClientInfo *ci;

    31

    32

	for (ci = _network_client_info; ci != &_network_client_info[MAX_CLIENT_INFO]; ci++)

    33

		if (ci->client_index == client_index)

    34

			return ci;

    35

    36

	return NULL;

    37

}

    38

    39

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

    40

ClientState *NetworkFindClientStateFromIndex(uint16 client_index)

    41

{

    42

	ClientState *cs;

    43

    44

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

    45

		if (cs->index == client_index)

    46

			return cs;

    47

    48

	return NULL;

    49

}

    50

    51

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

    52

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

    53

void NetworkGetClientName(char *client_name, size_t size, ClientState *cs)

    54

{

    55

	NetworkClientInfo *ci = DEREF_CLIENT_INFO(cs);

    56

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

    57

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

    58

	else

    59

		snprintf(client_name, size, "%s", ci->client_name);

    60

}

    61

    62

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

    63

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

    64

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

    65

{

    66

	char buf[1024];

    67

	va_list va;

    68

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

    69

    70

	va_start(va, str);

    71

	vsprintf(buf, str, va);

    72

	va_end(va);

    73

    74

	switch (action) {

    75

		case NETWORK_ACTION_JOIN_LEAVE:

    76

			IConsolePrintF(color, "*** %s %s", name, buf);

    77

			AddTextMessage(color, duration, "*** %s %s", name, buf);

    78

			break;

    79

		case NETWORK_ACTION_GIVE_MONEY:

    80

			IConsolePrintF(color, "*** %s %s", name, buf);

    81

			AddTextMessage(color, duration, "*** %s %s", name, buf);

    82

			break;

    83

		case NETWORK_ACTION_CHAT_PLAYER:

    84

			IConsolePrintF(color, "[Team] %s: %s", name, buf);

    85

			AddTextMessage(color, duration, "[Team] %s: %s", name, buf);

    86

			break;

    87

		case NETWORK_ACTION_CHAT_CLIENT:

    88

			IConsolePrintF(color, "[Private] %s: %s", name, buf);

    89

			AddTextMessage(color, duration, "[Private] %s: %s", name, buf);

    90

			break;

    91

		case NETWORK_ACTION_CHAT_TO_CLIENT:

    92

			IConsolePrintF(color, "[Private] To %s: %s", name, buf);

    93

			AddTextMessage(color, duration, "[Private] To %s: %s", name, buf);

    94

			break;

    95

		case NETWORK_ACTION_CHAT_TO_PLAYER:

    96

			IConsolePrintF(color, "[Team] To %s: %s", name, buf);

    97

			AddTextMessage(color, duration, "[Team] To %s: %s", name, buf);

    98

			break;

    99

		case NETWORK_ACTION_NAME_CHANGE:

   100

			IConsolePrintF(color, "*** %s changed his name to %s", name, buf);

   101

			AddTextMessage(color, duration, "*** %s changed his name to %s", name, buf);

   102

			break;

   103

		default:

   104

			IConsolePrintF(color, "[All] %s: %s", name, buf);

   105

			AddTextMessage(color, duration, "[All] %s: %s", name, buf);

   106

			break;

   107

	}

   108

}

   109

   110

// Calculate the frame-lag of a client

   111

uint NetworkCalculateLag(const ClientState *cs)

   112

{

   113

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

   114

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

   115

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

   116

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

   117

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

   118

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

   119

   120

	return lag;

   121

}

   122

   123

   124

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

   125

//  error

   126

void NetworkError(StringID error_string)

   127

{

   128

	_switch_mode = SM_MENU;

   129

	_switch_mode_errorstr = error_string;

   130

}

   131

   132

void ClientStartError(char *error) {

   133

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

   134

	NetworkError(STR_NETWORK_ERR_CLIENT_START);

   135

}

   136

   137

void ServerStartError(char *error) {

   138

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

   139

	NetworkError(STR_NETWORK_ERR_SERVER_START);

   140

}

   141

   142

void NetworkClientError(byte res, ClientState *cs) {

   143

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

   144

	//  disconnection (and why!)

   145

	NetworkErrorCode errorno;

   146

   147

	// We just want to close the connection..

   148

	if (res == NETWORK_RECV_STATUS_CLOSE_QUERY) {

   149

		cs->quited = true;

   150

		CloseClient(cs);

   151

		_networking = false;

   152

   153

		DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0);

   154

		return;

   155

	}

   156

   157

	switch(res) {

   158

		case NETWORK_RECV_STATUS_DESYNC: errorno = NETWORK_ERROR_DESYNC; break;

   159

		case NETWORK_RECV_STATUS_SAVEGAME: errorno = NETWORK_ERROR_SAVEGAME_FAILED; break;

   160

		default: errorno = NETWORK_ERROR_GENERAL;

   161

	}

   162

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

   163

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

   164

		SEND_COMMAND(PACKET_CLIENT_ERROR)(errorno);

   165

   166

		// Dequeue all commands before closing the socket

   167

		NetworkSend_Packets(DEREF_CLIENT(0));

   168

	}

   169

   170

	_switch_mode = SM_MENU;

   171

	CloseClient(cs);

   172

	_networking = false;

   173

}

   174

   175

// Find all IP-aliases for this host

   176

void NetworkFindIPs(void)

   177

{

   178

	int i, last;

   179

   180

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

   181

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

   182

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

   183

   184

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

   185

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

   186

		if (new_pos == 0) {

   187

			return B_ERROR;

   188

		}

   189

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

   190

		return B_OK;

   191

	}

   192

   193

	int output_length;

   194

	char *output_pointer = NULL;

   195

	char **output;

   196

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

   197

	i = 0;

   198

   199

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

   200

	_network_ip_list[0] = 0;

   201

   202

	if (sock < 0) {

   203

		DEBUG(net, 0)("Error creating socket!");

   204

		return;

   205

	}

   206

   207

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

   208

	if (output_length < 0) {

   209

		DEBUG(net, 0)("Error running _netstat!");

   210

		return;

   211

	}

   212

   213

	output = &output_pointer;

   214

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

   215

		for (;;) {

   216

			uint32 n, fields, read;

   217

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

   218

			struct in_addr inaddr;

   219

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

   220

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

   221

			read += 1;

   222

			if (fields != 9) {

   223

				break;

   224

			}

   225

			inaddr.s_addr = htonl((uint32)i1 << 24 | (uint32)i2 << 16 | (uint32)i3 << 8 | (uint32)i4);

   226

			if (inaddr.s_addr != 0) {

   227

				_network_ip_list[i] = inaddr.s_addr;

   228

				i++;

   229

			}

   230

			if (read < 0) {

   231

				break;

   232

			}

   233

			*output += read;

   234

		}

   235

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

   236

		/*free(output_pointer);*/

   237

		/*free(output);*/

   238

		closesocket(sock);

   239

	}

   240

#elif defined(HAVE_GETIFADDRS)

   241

	struct ifaddrs *ifap, *ifa;

   242

   243

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

   244

	_network_ip_list[0] = 0;

   245

   246

	if (getifaddrs(&ifap) != 0)

   247

		return;

   248

   249

	i = 0;

   250

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

   251

		if (ifa->ifa_addr == NULL || ifa->ifa_addr->sa_family != AF_INET)

   252

			continue;

   253

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

   254

		i++;

   255

	}

   256

	freeifaddrs(ifap);

   257

   258

#else /* not HAVE_GETIFADDRS */

   259

   260

	unsigned long len = 0;

   261

	SOCKET sock;

   262

	IFREQ ifo[MAX_INTERFACES];

   263

   264

#ifndef WIN32

   265

	struct ifconf if_conf;

   266

#endif

   267

   268

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

   269

	_network_ip_list[0] = 0;

   270

   271

	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {

   272

		return;

   273

	}

   274

   275

#ifdef WIN32

   276

	// On windows it is easy

   277

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

   278

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

   279

		closesocket(sock);

   280

		return;

   281

	}

   282

#else

   283

	// On linux a bit harder

   284

	if_conf.ifc_len = (sizeof (struct ifreq)) * MAX_INTERFACES;

   285

	if_conf.ifc_buf = (char *)&ifo[0];

   286

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

   287

		closesocket(sock);

   288

		return;

   289

	}

   290

	len = if_conf.ifc_len;

   291

#endif /* WIN32 */

   292

   293

	// Now walk through all IPs and list them

   294

	for (i = 0; i < (int)(len / sizeof(IFREQ)); i++) {

   295

		// Request IP for this interface

   296

#ifdef WIN32

   297

		_network_ip_list[i] = *(&ifo[i].iiAddress.AddressIn.sin_addr.s_addr);

   298

#else

   299

		if ((ioctl(sock, SIOCGIFADDR, &ifo[i])) != 0) {

   300

			closesocket(sock);

   301

			return;

   302

		}

   303

   304

		_network_ip_list[i] = ((struct sockaddr_in *)&ifo[i].ifr_addr)->sin_addr.s_addr;

   305

#endif

   306

	}

   307

   308

	closesocket(sock);

   309

   310

#endif /* not HAVE_GETIFADDRS */

   311

   312

	_network_ip_list[i] = 0;

   313

	last = i - 1;

   314

   315

	DEBUG(net, 3)("Detected IPs:");

   316

	// Now display to the debug all the detected ips

   317

	i = 0;

   318

	while (_network_ip_list[i] != 0) {

   319

		// Also check for non-used ips (127.0.0.1)

   320

		if (_network_ip_list[i] == inet_addr("127.0.0.1")) {

   321

			// If there is an ip after thisone, put him in here

   322

			if (last > i)

   323

				_network_ip_list[i] = _network_ip_list[last];

   324

			// Clear the last ip

   325

			_network_ip_list[last] = 0;

   326

			// And we have 1 ip less

   327

			last--;

   328

			continue;

   329

		}

   330

   331

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

   332

		i++;

   333

	}

   334

}

   335

   336

// Resolve a hostname to a inet_addr

   337

unsigned long NetworkResolveHost(const char *hostname)

   338

{

   339

	in_addr_t ip;

   340

   341

	// First try: is it an ip address?

   342

	ip = inet_addr(hostname);

   343

   344

	// If not try to resolve the name

   345

	if (ip == INADDR_NONE) {

   346

		struct hostent *he = gethostbyname(hostname);

   347

		if (he == NULL) {

   348

			DEBUG(net, 0) ("[NET] Cannot resolve %s", hostname);

   349

		} else {

   350

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

   351

			DEBUG(net, 1) ("[NET] Resolved %s to %s", hostname, inet_ntoa(addr));

   352

			ip = addr.s_addr;

   353

		}

   354

	}

   355

	return ip;

   356

}

   357

   358

// Converts a string to ip/port/player

   359

//  Format: IP#player:port

   360

//

   361

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

   362

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

   363

// occupied by connection_string.

   364

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

   365

{

   366

	byte *p;

   367

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

   368

		if (*p == '#') {

   369

			*player = p + 1;

   370

			*p = '\0';

   371

		} else if (*p == ':') {

   372

			*port = p + 1;

   373

			*p = '\0';

   374

		}

   375

	}

   376

}

   377

   378

// Creates a new client from a socket

   379

//   Used both by the server and the client

   380

static ClientState *AllocClient(SOCKET s)

   381

{

   382

	ClientState *cs;

   383

	NetworkClientInfo *ci;

   384

	byte client_no;

   385

   386

	client_no = 0;

   387

   388

	if (_network_server) {

   389

		// Can we handle a new client?

   390

		if (_network_clients_connected >= MAX_CLIENTS)

   391

			return NULL;

   392

   393

		if (_network_game_info.clients_on >= _network_game_info.clients_max)

   394

			return NULL;

   395

   396

		// Register the login

   397

		client_no = _network_clients_connected++;

   398

	}

   399

   400

	cs = &_clients[client_no];

   401

	memset(cs, 0, sizeof(*cs));

   402

	cs->socket = s;

   403

	cs->last_frame = 0;

   404

	cs->quited = false;

   405

   406

	if (_network_server) {

   407

		ci = &_network_client_info[client_no];

   408

		memset(ci, 0, sizeof(*ci));

   409

   410

		cs->index = _network_client_index++;

   411

		ci->client_index = cs->index;

   412

		ci->join_date = _date;

   413

   414

		InvalidateWindow(WC_CLIENT_LIST, 0);

   415

	}

   416

   417

	return cs;

   418

}

   419

   420

// Close a connection

   421

void CloseClient(ClientState *cs)

   422

{

   423

	NetworkClientInfo *ci;

   424

	// Socket is already dead

   425

	if (cs->socket == INVALID_SOCKET) return;

   426

   427

	DEBUG(net, 1) ("[NET] Closed client connection");

   428

   429

	if (!cs->quited && _network_server && cs->status > STATUS_INACTIVE) {

   430

		// We did not receive a leave message from this client...

   431

		NetworkErrorCode errorno = NETWORK_ERROR_CONNECTION_LOST;

   432

		char str1[100], str2[100];

   433

		char client_name[NETWORK_NAME_LENGTH];

   434

		ClientState *new_cs;

   435

   436

		NetworkGetClientName(client_name, sizeof(client_name), cs);

   437

   438

		GetString(str1, STR_NETWORK_ERR_LEFT);

   439

		GetString(str2, STR_NETWORK_ERR_CLIENT_GENERAL + errorno);

   440

   441

		NetworkTextMessage(NETWORK_ACTION_JOIN_LEAVE, 1, client_name, "%s (%s)", str1, str2);

   442

   443

		// Inform other clients of this... strange leaving ;)

   444

		FOR_ALL_CLIENTS(new_cs) {

   445

			if (new_cs->status > STATUS_AUTH && cs != new_cs) {

   446

				SEND_COMMAND(PACKET_SERVER_ERROR_QUIT)(new_cs, cs->index, errorno);

   447

			}

   448

		}

   449

	}

   450

   451

	closesocket(cs->socket);

   452

	cs->writable = false;

   453

   454

	// Free all pending and partially received packets

   455

	while (cs->packet_queue != NULL) {

   456

		Packet *p = cs->packet_queue->next;

   457

		free(cs->packet_queue);

   458

		cs->packet_queue = p;

   459

	}

   460

	free(cs->packet_recv);

   461

	cs->packet_recv = NULL;

   462

   463

	while (cs->command_queue != NULL) {

   464

		CommandPacket *p = cs->command_queue->next;

   465

		free(cs->command_queue);

   466

		cs->command_queue = p;

   467

	}

   468

   469

	// Close the gap in the client-list

   470

	ci = DEREF_CLIENT_INFO(cs);

   471

   472

	if (_network_server) {

   473

		// We just lost one client :(

   474

		if (cs->status > STATUS_INACTIVE)

   475

			_network_game_info.clients_on--;

   476

		_network_clients_connected--;

   477

   478

		while ((cs + 1) != DEREF_CLIENT(MAX_CLIENTS) && (cs + 1)->socket != INVALID_SOCKET) {

   479

			*cs = *(cs + 1);

   480

			*ci = *(ci + 1);

   481

			cs++;

   482

			ci++;

   483

		}

   484

   485

		InvalidateWindow(WC_CLIENT_LIST, 0);

   486

	}

   487

   488

	// Reset the status of the last socket

   489

	cs->socket = INVALID_SOCKET;

   490

	cs->status = STATUS_INACTIVE;

   491

	cs->index = NETWORK_EMPTY_INDEX;

   492

	ci->client_index = NETWORK_EMPTY_INDEX;

   493

}

   494