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/* $Id$ */

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#ifdef ENABLE_NETWORK

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#include "network_data.h"

    11

#include "network_gamelist.h"

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#include "network_udp.h"

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    24

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enum {

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	ADVERTISE_NORMAL_INTERVAL = 30000, // interval between advertising in ticks (15 minutes)

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	ADVERTISE_RETRY_INTERVAL  =   300, // readvertise when no response after this many ticks (9 seconds)

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

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};

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

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    33

static NetworkClientState _udp_cs;

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    35

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER)

    36

{

    37

	Packet *packet;

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

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	if (!_network_udp_server)

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		return;

    41

    42

	packet = NetworkSend_Init(PACKET_UDP_SERVER_RESPONSE);

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    44

	// Update some game_info

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    54

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	// Let the client know that we are here

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	NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);

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    58

	free(packet);

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	DEBUG(net, 2, "[udp] queried from '%s'", inet_ntoa(client_addr->sin_addr));

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}

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DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE)

    82

{

    83

	extern const char _openttd_revision[];

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	NetworkGameList *item;

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    86

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

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    89

	DEBUG(net, 4, "[udp] server response from %s:%d", inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));

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	// Find next item

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

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    95

    97

	{

    98

		/* Checks whether there needs to be a request for names of GRFs and makes

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		 * the request if necessary. GRFs that need to be requested are the GRFs

   100

		 * that do not exist on the clients system and we do not have the name

   101

		 * resolved of, i.e. the name is still UNKNOWN_GRF_NAME_PLACEHOLDER.

   102

		 * The in_request array and in_request_count are used so there is no need

   103

		 * to do a second loop over the GRF list, which can be relatively expensive

   104

		 * due to the string comparisons. */

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		const GRFConfig *in_request[NETWORK_MAX_GRF_COUNT];

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		const GRFConfig *c;

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		uint in_request_count = 0;

   108

		struct sockaddr_in out_addr;

   109

   110

		for (c = item->info.grfconfig; c != NULL; c = c->next) {

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			if (!HASBIT(c->flags, GCF_NOT_FOUND) || strcmp(c->name, UNKNOWN_GRF_NAME_PLACEHOLDER) != 0) continue;

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			in_request[in_request_count] = c;

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			in_request_count++;

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		}

   116

   117

		if (in_request_count > 0) {

   118

			/* There are 'unknown' GRFs, now send a request for them */

   119

			uint i;

   120

			Packet *packet = NetworkSend_Init(PACKET_UDP_CLIENT_GET_NEWGRFS);

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   122

			NetworkSend_uint8 (packet, in_request_count);

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			for (i = 0; i < in_request_count; i++) {

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				NetworkSend_GRFIdentifier(packet, in_request[i]);

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			}

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   127

			out_addr.sin_family      = AF_INET;

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			out_addr.sin_port        = htons(item->port);

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			out_addr.sin_addr.s_addr = item->ip;

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			NetworkSendUDP_Packet(_udp_client_socket, packet, &out_addr);

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			free(packet);

   132

		}

   133

	}

   134

   147

	item->online = true;

   148

   149

	UpdateNetworkGameWindow(false);

   150

}

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   152

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO)

   153

{

   154

	NetworkClientState *cs;

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	NetworkClientInfo *ci;

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	Packet *packet;

   157

	Player *player;

   158

	byte current = 0;

   159

	int i;

   160

   161

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

   162

	if (!_network_udp_server) return;

   163

   164

	packet = NetworkSend_Init(PACKET_UDP_SERVER_DETAIL_INFO);

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   166

	/* Send the amount of active companies */

   167

	NetworkSend_uint8 (packet, NETWORK_COMPANY_INFO_VERSION);

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	NetworkSend_uint8 (packet, ActivePlayerCount());

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   170

	/* Fetch the latest version of everything */

   171

	NetworkPopulateCompanyInfo();

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   173

	/* Go through all the players */

   174

	FOR_ALL_PLAYERS(player) {

   175

		/* Skip non-active players */

   176

		if (!player->is_active) continue;

   177

   178

		current++;

   179

   180

		/* Send the information */

   181

		NetworkSend_uint8(packet, current);

   182

   183

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

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		NetworkSend_uint32(packet, _network_player_info[player->index].inaugurated_year);

   185

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

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

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

   188

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

   189

   190

		/* Send 1 if there is a passord for the company else send 0 */

   191

		if (_network_player_info[player->index].password[0] != '\0') {

   192

			NetworkSend_uint8(packet, 1);

   193

		} else {

   194

			NetworkSend_uint8(packet, 0);

   195

		}

   196

   197

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

   198

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

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   200

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

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

   202

   203

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

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		FOR_ALL_CLIENTS(cs) {

   205

			ci = DEREF_CLIENT_INFO(cs);

   206

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

   207

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

   208

				NetworkSend_uint8(packet, 1);

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				NetworkSend_string(packet, ci->client_name);

   210

				NetworkSend_string(packet, ci->unique_id);

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				NetworkSend_uint32(packet, ci->join_date);

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			}

   213

		}

   214

		/* Also check for the server itself */

   215

		ci = NetworkFindClientInfoFromIndex(NETWORK_SERVER_INDEX);

   216

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

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

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			NetworkSend_uint8(packet, 1);

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			NetworkSend_string(packet, ci->client_name);

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			NetworkSend_string(packet, ci->unique_id);

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			NetworkSend_uint32(packet, ci->join_date);

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		}

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   224

		/* Indicates end of client list */

   225

		NetworkSend_uint8(packet, 0);

   226

	}

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   228

	/* And check if we have any spectators */

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	FOR_ALL_CLIENTS(cs) {

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		ci = DEREF_CLIENT_INFO(cs);

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		if (!IsValidPlayer(ci->client_playas)) {

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

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			NetworkSend_uint8(packet, 1);

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			NetworkSend_string(packet, ci->client_name);

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			NetworkSend_string(packet, ci->unique_id);

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			NetworkSend_uint32(packet, ci->join_date);

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		}

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	}

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   240

	/* Also check for the server itself */

   241

	ci = NetworkFindClientInfoFromIndex(NETWORK_SERVER_INDEX);

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	if (!IsValidPlayer(ci->client_playas)) {

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

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		NetworkSend_uint8(packet, 1);

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		NetworkSend_string(packet, ci->client_name);

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		NetworkSend_string(packet, ci->unique_id);

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		NetworkSend_uint32(packet, ci->join_date);

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	}

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   250

	/* Indicates end of client list */

   251

	NetworkSend_uint8(packet, 0);

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   253

	NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);

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	free(packet);

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}

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   258

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST)

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{

   260

	int i;

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	struct in_addr ip;

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	uint16 port;

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	uint8 ver;

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   265

	/* packet begins with the protocol version (uint8)

   266

	 * then an uint16 which indicates how many

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

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

   269

	 */

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   271

	ver = NetworkRecv_uint8(&_udp_cs, p);

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   273

	if (_udp_cs.has_quit) return;

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   275

	if (ver == 1) {

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

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			ip.s_addr = TO_LE32(NetworkRecv_uint32(&_udp_cs, p));

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			port = NetworkRecv_uint16(&_udp_cs, p);

   279

			NetworkUDPQueryServer(inet_ntoa(ip), port);

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		}

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	}

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}

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DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER)

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{

   286

	_network_advertise_retries = 0;

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	DEBUG(net, 2, "[udp] advertising on master server successfull");

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   289

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

   290

	if (!_network_advertise) NetworkUDPRemoveAdvertise();

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}

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/**

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 * A client has requested the names of some NewGRFs.

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 *

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 * Replying this can be tricky as we have a limit of SEND_MTU bytes

   297

 * in the reply packet and we can send up to 100 bytes per NewGRF

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 * (GRF ID, MD5sum and NETWORK_GRF_NAME_LENGTH bytes for the name).

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 * As SEND_MTU is _much_ less than 100 * NETWORK_MAX_GRF_COUNT, it

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 * could be that a packet overflows. To stop this we only reply

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 * with the first N NewGRFs so that if the first N + 1 NewGRFs

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 * would be sent, the packet overflows.

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 * in_reply and in_reply_count are used to keep a list of GRFs to

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 * send in the reply.

   305

 */

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DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS)

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{

   308

	uint8 num_grfs;

   309

	uint i;

   310

   311

	const GRFConfig *in_reply[NETWORK_MAX_GRF_COUNT];

   312

	Packet *packet;

   313

	uint8 in_reply_count = 0;

   314

	uint packet_len = 0;

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   316

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

   317

	if (_udp_cs.has_quit) return;

   318

   319

	DEBUG(net, 6, "[udp] newgrf data request from %s:%d", inet_ntoa(client_addr->sin_addr), ntohs(client_addr->sin_port));

   320

   321

	num_grfs = NetworkRecv_uint8 (&_udp_cs, p);

   322

	if (num_grfs > NETWORK_MAX_GRF_COUNT) return;

   323

   324

	for (i = 0; i < num_grfs; i++) {

   325

		GRFConfig c;

   326

		const GRFConfig *f;

   327

   329

   330

		/* Find the matching GRF file */

   331

		f = FindGRFConfig(c.grfid, c.md5sum);

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		if (f == NULL) continue; // The GRF is unknown to this server

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   334

		/* If the reply might exceed the size of the packet, only reply

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		 * the current list and do not send the other data.

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		 * The name could be an empty string, if so take the filename. */

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		packet_len += sizeof(c.grfid) + sizeof(c.md5sum) +

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				min(strlen((f->name != NULL && strlen(f->name) > 0) ? f->name : f->filename) + 1, NETWORK_GRF_NAME_LENGTH);

   339

		if (packet_len > SEND_MTU - 4) { // 4 is 3 byte header + grf count in reply

   340

			break;

   341

		}

   342

		in_reply[in_reply_count] = f;

   343

		in_reply_count++;

   344

	}

   345

   346

	if (in_reply_count == 0) return;

   347

   348

	packet = NetworkSend_Init(PACKET_UDP_SERVER_NEWGRFS);

   349

	NetworkSend_uint8 (packet, in_reply_count);

   350

	for (i = 0; i < in_reply_count; i++) {

   351

		char name[NETWORK_GRF_NAME_LENGTH];

   352

   353

		/* The name could be an empty string, if so take the filename */

   354

		ttd_strlcpy(name, (in_reply[i]->name != NULL && strlen(in_reply[i]->name) > 0) ?

   355

				in_reply[i]->name : in_reply[i]->filename, sizeof(name));

   356

	 	NetworkSend_GRFIdentifier(packet, in_reply[i]);

   357

		NetworkSend_string(packet, name);

   358

	}

   359

   360

	NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);

   361

	free(packet);

   362

}

   363

   364

/** The return of the client's request of the names of some NewGRFs */

   365

DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS)

   366

{

   367

	uint8 num_grfs;

   368

	uint i;

   369

   370

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

   371

	if (_udp_cs.has_quit) return;

   372

   373

	DEBUG(net, 6, "[udp] newgrf data reply from %s:%d", inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));

   374

   375

	num_grfs = NetworkRecv_uint8 (&_udp_cs, p);

   376

	if (num_grfs > NETWORK_MAX_GRF_COUNT) return;

   377

   378

	for (i = 0; i < num_grfs; i++) {

   379

		char *unknown_name;

   380

		char name[NETWORK_GRF_NAME_LENGTH];

   381

		GRFConfig c;

   382

   384

		NetworkRecv_string(&_udp_cs, p, name, sizeof(name));

   385

   386

		/* An empty name is not possible under normal circumstances

   387

		 * and causes problems when showing the NewGRF list. */

   388

		if (strlen(name) == 0) continue;

   389

   390

		/* Finds the fake GRFConfig for the just read GRF ID and MD5sum tuple.

   391

		 * If it exists and not resolved yet, then name of the fake GRF is

   392

		 * overwritten with the name from the reply. */

   393

		unknown_name = FindUnknownGRFName(c.grfid, c.md5sum, false);

   394

		if (unknown_name != NULL && strcmp(unknown_name, UNKNOWN_GRF_NAME_PLACEHOLDER) == 0) {

   395

			ttd_strlcpy(unknown_name, name, NETWORK_GRF_NAME_LENGTH);

   396

		}

   397

	}

   398

}

   399

   400

   401

// The layout for the receive-functions by UDP

   402

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

   403

   404

static NetworkUDPPacket* const _network_udp_packet[] = {

   405

	RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER),

   406

	RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE),

   407

	RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO),

   408

	NULL,

   409

	NULL,

   410

	RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER),

   411

	NULL,

   412

	RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST),

   413

	NULL,

   414

	RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS),

   415

	RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS),

   416

};

   417

   418

   419

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

   420

assert_compile(lengthof(_network_udp_packet) == PACKET_UDP_END);

   421

   422

   424

{

   425

	byte type;

   426

   427

	/* Fake a client, so we can see when there is an illegal packet */

   428

	_udp_cs.socket = INVALID_SOCKET;

   429

	_udp_cs.has_quit = false;

   430

   431

	type = NetworkRecv_uint8(&_udp_cs, p);

   432

   433

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

   434

		_network_udp_packet[type](p, client_addr);

   435

	} else {

   436

		if (!_udp_cs.has_quit) {

   437

			DEBUG(net, 0, "[udp] received invalid packet type %d", type);

   438

		} else {

   439

			DEBUG(net, 0, "[udp] received illegal packet");

   440

		}

   441

	}

   442

}

   443

   444

   445

// Close UDP connection

   446

void NetworkUDPClose(void)

   447

{

   448

	DEBUG(net, 1, "[udp] closed listeners");

   449

   450

	if (_network_udp_server) {

   451

		if (_udp_server_socket != INVALID_SOCKET) {

   452

			closesocket(_udp_server_socket);

   453

			_udp_server_socket = INVALID_SOCKET;

   454

		}

   455

   456

		if (_udp_master_socket != INVALID_SOCKET) {

   457

			closesocket(_udp_master_socket);

   458

			_udp_master_socket = INVALID_SOCKET;

   459

		}

   460

   461

		_network_udp_server = false;

   462

		_network_udp_broadcast = 0;

   463

	} else {

   464

		if (_udp_client_socket != INVALID_SOCKET) {

   465

			closesocket(_udp_client_socket);

   466

			_udp_client_socket = INVALID_SOCKET;

   467

		}

   468

		_network_udp_broadcast = 0;

   469

	}

   470

}

   471

   472

// Broadcast to all ips

   473

static void NetworkUDPBroadCast(SOCKET udp)

   474

{

   475

	Packet* p = NetworkSend_Init(PACKET_UDP_CLIENT_FIND_SERVER);

   476

	uint i;

   477

   478

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

   479

		struct sockaddr_in out_addr;

   480

   481

		out_addr.sin_family = AF_INET;

   482

		out_addr.sin_port = htons(_network_server_port);

   483

		out_addr.sin_addr.s_addr = _broadcast_list[i];

   484

   485

		DEBUG(net, 4, "[udp] broadcasting to %s", inet_ntoa(out_addr.sin_addr));

   486

   487

		NetworkSendUDP_Packet(udp, p, &out_addr);

   488

	}

   489

   490

	free(p);

   491

}