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Location: cpp/openttd-patchpack/source/network_udp.c - annotation
r5433:2fbd2e8f1409
27.4 KiB
text/x-c
(svn r7639) -Fix: FS#487 Changed music/qtmidi.c to not use functions deprecated by Apple (pvz)
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r543:efdb197f91ad r543:efdb197f91ad r543:efdb197f91ad | /* $Id$ */
#ifdef ENABLE_NETWORK
#include "stdafx.h"
#include "debug.h"
#include "string.h"
#include "network_data.h"
#include "date.h"
#include "map.h"
#include "network_gamelist.h"
#include "network_udp.h"
#include "variables.h"
#include "newgrf_config.h"
//
// This file handles all the LAN-stuff
// Stuff like:
// - UDP search over the network
//
typedef enum {
PACKET_UDP_CLIENT_FIND_SERVER,
PACKET_UDP_SERVER_RESPONSE,
PACKET_UDP_CLIENT_DETAIL_INFO,
PACKET_UDP_SERVER_DETAIL_INFO, // Is not used in OpenTTD itself, only for external querying
PACKET_UDP_SERVER_REGISTER, // Packet to register itself to the master server
PACKET_UDP_MASTER_ACK_REGISTER, // Packet indicating registration has succedeed
PACKET_UDP_CLIENT_GET_LIST, // Request for serverlist from master server
PACKET_UDP_MASTER_RESPONSE_LIST, // Response from master server with server ip's + port's
PACKET_UDP_SERVER_UNREGISTER, // Request to be removed from the server-list
PACKET_UDP_CLIENT_GET_NEWGRFS, // Requests the name for a list of GRFs (GRF_ID and MD5)
PACKET_UDP_SERVER_NEWGRFS, // Sends the list of NewGRF's requested.
PACKET_UDP_END
} PacketUDPType;
enum {
ADVERTISE_NORMAL_INTERVAL = 30000, // interval between advertising in ticks (15 minutes)
ADVERTISE_RETRY_INTERVAL = 300, // readvertise when no response after this many ticks (9 seconds)
ADVERTISE_RETRY_TIMES = 3 // give up readvertising after this much failed retries
};
#define DEF_UDP_RECEIVE_COMMAND(type) void NetworkPacketReceive_ ## type ## _command(Packet *p, struct sockaddr_in *client_addr)
static void NetworkSendUDP_Packet(SOCKET udp, Packet* p, struct sockaddr_in* recv);
static NetworkClientState _udp_cs;
/**
* Serializes the GRFIdentifier (GRF ID and MD5 checksum) to the packet
* @param p the packet to write the data to
* @param c the configuration to write the GRF ID and MD5 checksum from
*/
static void NetworkSend_GRFIdentifier(Packet *p, const GRFConfig *c)
{
uint j;
NetworkSend_uint32(p, c->grfid);
for (j = 0; j < sizeof(c->md5sum); j++) {
NetworkSend_uint8 (p, c->md5sum[j]);
}
}
/**
* Deserializes the GRFIdentifier (GRF ID and MD5 checksum) from the packet
* @param p the packet to read the data from
* @param c the configuration to write the GRF ID and MD5 checksum to
*/
static void NetworkRecv_GRFIdentifier(Packet *p, GRFConfig *c)
{
uint j;
c->grfid = NetworkRecv_uint32(&_udp_cs, p);
for (j = 0; j < sizeof(c->md5sum); j++) {
c->md5sum[j] = NetworkRecv_uint8(&_udp_cs, p);
}
}
DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER)
{
Packet *packet;
// Just a fail-safe.. should never happen
if (!_network_udp_server)
return;
packet = NetworkSend_Init(PACKET_UDP_SERVER_RESPONSE);
// Update some game_info
_network_game_info.game_date = _date;
_network_game_info.map_width = MapSizeX();
_network_game_info.map_height = MapSizeY();
_network_game_info.map_set = _opt.landscape;
NetworkSend_uint8 (packet, NETWORK_GAME_INFO_VERSION);
/* NETWORK_GAME_INFO_VERSION = 4 */
{
/* Only send the GRF Identification (GRF_ID and MD5 checksum) of
* the GRFs that are needed, i.e. the ones that the server has
* selected in the NewGRF GUI and not the ones that are used due
* to the fact that they are in [newgrf-static] in openttd.cfg */
const GRFConfig *c;
uint i = 0;
/* Count number of GRFs to send information about */
for (c = _grfconfig; c != NULL; c = c->next) {
if (!HASBIT(c->flags, GCF_STATIC)) i++;
}
NetworkSend_uint8 (packet, i); // Send number of GRFs
/* Send actual GRF Identifications */
for (c = _grfconfig; c != NULL; c = c->next) {
if (!HASBIT(c->flags, GCF_STATIC)) NetworkSend_GRFIdentifier(packet, c);
}
}
/* NETWORK_GAME_INFO_VERSION = 3 */
NetworkSend_uint32(packet, _network_game_info.game_date);
NetworkSend_uint32(packet, _network_game_info.start_date);
/* NETWORK_GAME_INFO_VERSION = 2 */
NetworkSend_uint8 (packet, _network_game_info.companies_max);
NetworkSend_uint8 (packet, ActivePlayerCount());
NetworkSend_uint8 (packet, _network_game_info.spectators_max);
/* NETWORK_GAME_INFO_VERSION = 1 */
NetworkSend_string(packet, _network_game_info.server_name);
NetworkSend_string(packet, _network_game_info.server_revision);
NetworkSend_uint8 (packet, _network_game_info.server_lang);
NetworkSend_uint8 (packet, _network_game_info.use_password);
NetworkSend_uint8 (packet, _network_game_info.clients_max);
NetworkSend_uint8 (packet, _network_game_info.clients_on);
NetworkSend_uint8 (packet, NetworkSpectatorCount());
NetworkSend_string(packet, _network_game_info.map_name);
NetworkSend_uint16(packet, _network_game_info.map_width);
NetworkSend_uint16(packet, _network_game_info.map_height);
NetworkSend_uint8 (packet, _network_game_info.map_set);
NetworkSend_uint8 (packet, _network_game_info.dedicated);
// Let the client know that we are here
NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);
free(packet);
DEBUG(net, 2, "[udp] queried from '%s'", inet_ntoa(client_addr->sin_addr));
}
DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE)
{
extern const char _openttd_revision[];
NetworkGameList *item;
byte game_info_version;
// Just a fail-safe.. should never happen
if (_network_udp_server)
return;
game_info_version = NetworkRecv_uint8(&_udp_cs, p);
if (_udp_cs.has_quit) return;
DEBUG(net, 4, "[udp] server response from %s:%d", inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));
// Find next item
item = NetworkGameListAddItem(inet_addr(inet_ntoa(client_addr->sin_addr)), ntohs(client_addr->sin_port));
item->info.compatible = true;
/* Please observer the order. In the order in which packets are sent
* they are to be received */
switch (game_info_version) {
case 4: {
GRFConfig *c, **dst = &item->info.grfconfig;
const GRFConfig *f;
uint i;
uint num_grfs = NetworkRecv_uint8(&_udp_cs, p);
for (i = 0; i < num_grfs; i++) {
c = calloc(1, sizeof(*c));
NetworkRecv_GRFIdentifier(p, c);
/* Find the matching GRF file */
f = FindGRFConfig(c->grfid, c->md5sum);
if (f == NULL) {
/* Don't know the GRF, so mark game incompatible and the (possibly)
* already resolved name for this GRF (another server has sent the
* name of the GRF already */
item->info.compatible = false;
c->name = FindUnknownGRFName(c->grfid, c->md5sum, true);
SETBIT(c->flags, GCF_NOT_FOUND);
} else {
c->filename = f->filename;
c->name = f->name;
c->info = f->info;
}
SETBIT(c->flags, GCF_COPY);
/* Append GRFConfig to the list */
*dst = c;
dst = &c->next;
}
} /* Fallthrough */
case 3:
item->info.game_date = NetworkRecv_uint32(&_udp_cs, p);
item->info.start_date = NetworkRecv_uint32(&_udp_cs, p);
/* Fallthrough */
case 2:
item->info.companies_max = NetworkRecv_uint8(&_udp_cs, p);
item->info.companies_on = NetworkRecv_uint8(&_udp_cs, p);
item->info.spectators_max = NetworkRecv_uint8(&_udp_cs, p);
/* Fallthrough */
case 1:
NetworkRecv_string(&_udp_cs, p, item->info.server_name, sizeof(item->info.server_name));
NetworkRecv_string(&_udp_cs, p, item->info.server_revision, sizeof(item->info.server_revision));
item->info.server_lang = NetworkRecv_uint8(&_udp_cs, p);
item->info.use_password = NetworkRecv_uint8(&_udp_cs, p);
item->info.clients_max = NetworkRecv_uint8(&_udp_cs, p);
item->info.clients_on = NetworkRecv_uint8(&_udp_cs, p);
item->info.spectators_on = NetworkRecv_uint8(&_udp_cs, p);
if (game_info_version < 3) { // 16 bits dates got scrapped and are read earlier
item->info.game_date = NetworkRecv_uint16(&_udp_cs, p) + DAYS_TILL_ORIGINAL_BASE_YEAR;
item->info.start_date = NetworkRecv_uint16(&_udp_cs, p) + DAYS_TILL_ORIGINAL_BASE_YEAR;
}
NetworkRecv_string(&_udp_cs, p, item->info.map_name, sizeof(item->info.map_name));
item->info.map_width = NetworkRecv_uint16(&_udp_cs, p);
item->info.map_height = NetworkRecv_uint16(&_udp_cs, p);
item->info.map_set = NetworkRecv_uint8(&_udp_cs, p);
item->info.dedicated = NetworkRecv_uint8(&_udp_cs, p);
if (item->info.server_lang >= NETWORK_NUM_LANGUAGES) item->info.server_lang = 0;
if (item->info.map_set >= NUM_LANDSCAPE ) item->info.map_set = 0;
if (item->info.hostname[0] == '\0')
snprintf(item->info.hostname, sizeof(item->info.hostname), "%s", inet_ntoa(client_addr->sin_addr));
/* Check if we are allowed on this server based on the revision-match */
item->info.version_compatible =
strcmp(item->info.server_revision, _openttd_revision) == 0 ||
strcmp(item->info.server_revision, NOREV_STRING) == 0;
item->info.compatible &= item->info.version_compatible; // Already contains match for GRFs
break;
}
{
/* Checks whether there needs to be a request for names of GRFs and makes
* the request if necessary. GRFs that need to be requested are the GRFs
* that do not exist on the clients system and we do not have the name
* resolved of, i.e. the name is still UNKNOWN_GRF_NAME_PLACEHOLDER.
* The in_request array and in_request_count are used so there is no need
* to do a second loop over the GRF list, which can be relatively expensive
* due to the string comparisons. */
const GRFConfig *in_request[NETWORK_MAX_GRF_COUNT];
const GRFConfig *c;
uint in_request_count = 0;
struct sockaddr_in out_addr;
for (c = item->info.grfconfig; c != NULL; c = c->next) {
if (!HASBIT(c->flags, GCF_NOT_FOUND) || strcmp(c->name, UNKNOWN_GRF_NAME_PLACEHOLDER) != 0) continue;
in_request[in_request_count] = c;
in_request_count++;
}
if (in_request_count > 0) {
/* There are 'unknown' GRFs, now send a request for them */
uint i;
Packet *packet = NetworkSend_Init(PACKET_UDP_CLIENT_GET_NEWGRFS);
NetworkSend_uint8 (packet, in_request_count);
for (i = 0; i < in_request_count; i++) {
NetworkSend_GRFIdentifier(packet, in_request[i]);
}
out_addr.sin_family = AF_INET;
out_addr.sin_port = htons(item->port);
out_addr.sin_addr.s_addr = item->ip;
NetworkSendUDP_Packet(_udp_client_socket, packet, &out_addr);
free(packet);
}
}
item->online = true;
UpdateNetworkGameWindow(false);
}
DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO)
{
NetworkClientState *cs;
NetworkClientInfo *ci;
Packet *packet;
Player *player;
byte current = 0;
int i;
// Just a fail-safe.. should never happen
if (!_network_udp_server) return;
packet = NetworkSend_Init(PACKET_UDP_SERVER_DETAIL_INFO);
/* Send the amount of active companies */
NetworkSend_uint8 (packet, NETWORK_COMPANY_INFO_VERSION);
NetworkSend_uint8 (packet, ActivePlayerCount());
/* Fetch the latest version of everything */
NetworkPopulateCompanyInfo();
/* Go through all the players */
FOR_ALL_PLAYERS(player) {
/* Skip non-active players */
if (!player->is_active) continue;
current++;
/* Send the information */
NetworkSend_uint8(packet, current);
NetworkSend_string(packet, _network_player_info[player->index].company_name);
NetworkSend_uint32(packet, _network_player_info[player->index].inaugurated_year);
NetworkSend_uint64(packet, _network_player_info[player->index].company_value);
NetworkSend_uint64(packet, _network_player_info[player->index].money);
NetworkSend_uint64(packet, _network_player_info[player->index].income);
NetworkSend_uint16(packet, _network_player_info[player->index].performance);
/* Send 1 if there is a passord for the company else send 0 */
if (_network_player_info[player->index].password[0] != '\0') {
NetworkSend_uint8(packet, 1);
} else {
NetworkSend_uint8(packet, 0);
}
for (i = 0; i < NETWORK_VEHICLE_TYPES; i++)
NetworkSend_uint16(packet, _network_player_info[player->index].num_vehicle[i]);
for (i = 0; i < NETWORK_STATION_TYPES; i++)
NetworkSend_uint16(packet, _network_player_info[player->index].num_station[i]);
/* Find the clients that are connected to this player */
FOR_ALL_CLIENTS(cs) {
ci = DEREF_CLIENT_INFO(cs);
if (ci->client_playas == player->index) {
/* The uint8 == 1 indicates that a client is following */
NetworkSend_uint8(packet, 1);
NetworkSend_string(packet, ci->client_name);
NetworkSend_string(packet, ci->unique_id);
NetworkSend_uint32(packet, ci->join_date);
}
}
/* Also check for the server itself */
ci = NetworkFindClientInfoFromIndex(NETWORK_SERVER_INDEX);
if (ci->client_playas == player->index) {
/* The uint8 == 1 indicates that a client is following */
NetworkSend_uint8(packet, 1);
NetworkSend_string(packet, ci->client_name);
NetworkSend_string(packet, ci->unique_id);
NetworkSend_uint32(packet, ci->join_date);
}
/* Indicates end of client list */
NetworkSend_uint8(packet, 0);
}
/* And check if we have any spectators */
FOR_ALL_CLIENTS(cs) {
ci = DEREF_CLIENT_INFO(cs);
if (!IsValidPlayer(ci->client_playas)) {
/* The uint8 == 1 indicates that a client is following */
NetworkSend_uint8(packet, 1);
NetworkSend_string(packet, ci->client_name);
NetworkSend_string(packet, ci->unique_id);
NetworkSend_uint32(packet, ci->join_date);
}
}
/* Also check for the server itself */
ci = NetworkFindClientInfoFromIndex(NETWORK_SERVER_INDEX);
if (!IsValidPlayer(ci->client_playas)) {
/* The uint8 == 1 indicates that a client is following */
NetworkSend_uint8(packet, 1);
NetworkSend_string(packet, ci->client_name);
NetworkSend_string(packet, ci->unique_id);
NetworkSend_uint32(packet, ci->join_date);
}
/* Indicates end of client list */
NetworkSend_uint8(packet, 0);
NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);
free(packet);
}
DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST)
{
int i;
struct in_addr ip;
uint16 port;
uint8 ver;
/* packet begins with the protocol version (uint8)
* then an uint16 which indicates how many
* ip:port pairs are in this packet, after that
* an uint32 (ip) and an uint16 (port) for each pair
*/
ver = NetworkRecv_uint8(&_udp_cs, p);
if (_udp_cs.has_quit) return;
if (ver == 1) {
for (i = NetworkRecv_uint16(&_udp_cs, p); i != 0 ; i--) {
ip.s_addr = TO_LE32(NetworkRecv_uint32(&_udp_cs, p));
port = NetworkRecv_uint16(&_udp_cs, p);
NetworkUDPQueryServer(inet_ntoa(ip), port);
}
}
}
DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER)
{
_network_advertise_retries = 0;
DEBUG(net, 2, "[udp] advertising on master server successfull");
/* We are advertised, but we don't want to! */
if (!_network_advertise) NetworkUDPRemoveAdvertise();
}
/**
* A client has requested the names of some NewGRFs.
*
* Replying this can be tricky as we have a limit of SEND_MTU bytes
* in the reply packet and we can send up to 100 bytes per NewGRF
* (GRF ID, MD5sum and NETWORK_GRF_NAME_LENGTH bytes for the name).
* As SEND_MTU is _much_ less than 100 * NETWORK_MAX_GRF_COUNT, it
* could be that a packet overflows. To stop this we only reply
* with the first N NewGRFs so that if the first N + 1 NewGRFs
* would be sent, the packet overflows.
* in_reply and in_reply_count are used to keep a list of GRFs to
* send in the reply.
*/
DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS)
{
uint8 num_grfs;
uint i;
const GRFConfig *in_reply[NETWORK_MAX_GRF_COUNT];
Packet *packet;
uint8 in_reply_count = 0;
uint packet_len = 0;
/* Just a fail-safe.. should never happen */
if (_udp_cs.has_quit) return;
DEBUG(net, 6, "[udp] newgrf data request from %s:%d", inet_ntoa(client_addr->sin_addr), ntohs(client_addr->sin_port));
num_grfs = NetworkRecv_uint8 (&_udp_cs, p);
if (num_grfs > NETWORK_MAX_GRF_COUNT) return;
for (i = 0; i < num_grfs; i++) {
GRFConfig c;
const GRFConfig *f;
NetworkRecv_GRFIdentifier(p, &c);
/* Find the matching GRF file */
f = FindGRFConfig(c.grfid, c.md5sum);
if (f == NULL) continue; // The GRF is unknown to this server
/* If the reply might exceed the size of the packet, only reply
* the current list and do not send the other data.
* The name could be an empty string, if so take the filename. */
packet_len += sizeof(c.grfid) + sizeof(c.md5sum) +
min(strlen((f->name != NULL && strlen(f->name) > 0) ? f->name : f->filename) + 1, NETWORK_GRF_NAME_LENGTH);
if (packet_len > SEND_MTU - 4) { // 4 is 3 byte header + grf count in reply
break;
}
in_reply[in_reply_count] = f;
in_reply_count++;
}
if (in_reply_count == 0) return;
packet = NetworkSend_Init(PACKET_UDP_SERVER_NEWGRFS);
NetworkSend_uint8 (packet, in_reply_count);
for (i = 0; i < in_reply_count; i++) {
char name[NETWORK_GRF_NAME_LENGTH];
/* The name could be an empty string, if so take the filename */
ttd_strlcpy(name, (in_reply[i]->name != NULL && strlen(in_reply[i]->name) > 0) ?
in_reply[i]->name : in_reply[i]->filename, sizeof(name));
NetworkSend_GRFIdentifier(packet, in_reply[i]);
NetworkSend_string(packet, name);
}
NetworkSendUDP_Packet(_udp_server_socket, packet, client_addr);
free(packet);
}
/** The return of the client's request of the names of some NewGRFs */
DEF_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS)
{
uint8 num_grfs;
uint i;
/* Just a fail-safe.. should never happen */
if (_udp_cs.has_quit) return;
DEBUG(net, 6, "[udp] newgrf data reply from %s:%d", inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));
num_grfs = NetworkRecv_uint8 (&_udp_cs, p);
if (num_grfs > NETWORK_MAX_GRF_COUNT) return;
for (i = 0; i < num_grfs; i++) {
char *unknown_name;
char name[NETWORK_GRF_NAME_LENGTH];
GRFConfig c;
NetworkRecv_GRFIdentifier(p, &c);
NetworkRecv_string(&_udp_cs, p, name, sizeof(name));
/* An empty name is not possible under normal circumstances
* and causes problems when showing the NewGRF list. */
if (strlen(name) == 0) continue;
/* Finds the fake GRFConfig for the just read GRF ID and MD5sum tuple.
* If it exists and not resolved yet, then name of the fake GRF is
* overwritten with the name from the reply. */
unknown_name = FindUnknownGRFName(c.grfid, c.md5sum, false);
if (unknown_name != NULL && strcmp(unknown_name, UNKNOWN_GRF_NAME_PLACEHOLDER) == 0) {
ttd_strlcpy(unknown_name, name, NETWORK_GRF_NAME_LENGTH);
}
}
}
// The layout for the receive-functions by UDP
typedef void NetworkUDPPacket(Packet *p, struct sockaddr_in *client_addr);
static NetworkUDPPacket* const _network_udp_packet[] = {
RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER),
RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE),
RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO),
NULL,
NULL,
RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER),
NULL,
RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST),
NULL,
RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS),
RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS),
};
// If this fails, check the array above with network_data.h
assert_compile(lengthof(_network_udp_packet) == PACKET_UDP_END);
static void NetworkHandleUDPPacket(Packet* p, struct sockaddr_in* client_addr)
{
byte type;
/* Fake a client, so we can see when there is an illegal packet */
_udp_cs.socket = INVALID_SOCKET;
_udp_cs.has_quit = false;
type = NetworkRecv_uint8(&_udp_cs, p);
if (type < PACKET_UDP_END && _network_udp_packet[type] != NULL && !_udp_cs.has_quit) {
_network_udp_packet[type](p, client_addr);
} else {
if (!_udp_cs.has_quit) {
DEBUG(net, 0, "[udp] received invalid packet type %d", type);
} else {
DEBUG(net, 0, "[udp] received illegal packet");
}
}
}
// Send a packet over UDP
static void NetworkSendUDP_Packet(SOCKET udp, Packet* p, struct sockaddr_in* recv)
{
int res;
// Put the length in the buffer
p->buffer[0] = p->size & 0xFF;
p->buffer[1] = p->size >> 8;
// Send the buffer
res = sendto(udp, p->buffer, p->size, 0, (struct sockaddr *)recv, sizeof(*recv));
// Check for any errors, but ignore it otherwise
if (res == -1) DEBUG(net, 1, "[udp] sendto failed with: %i", GET_LAST_ERROR());
}
// Start UDP listener
bool NetworkUDPListen(SOCKET *udp, uint32 host, uint16 port, bool broadcast)
{
struct sockaddr_in sin;
// Make sure socket is closed
closesocket(*udp);
*udp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (*udp == INVALID_SOCKET) {
DEBUG(net, 0, "[udp] failed to start UDP listener");
return false;
}
// set nonblocking mode for socket
{
unsigned long blocking = 1;
#ifndef BEOS_NET_SERVER
ioctlsocket(*udp, FIONBIO, &blocking);
#else
setsockopt(*udp, SOL_SOCKET, SO_NONBLOCK, &blocking, NULL);
#endif
}
sin.sin_family = AF_INET;
// Listen on all IPs
sin.sin_addr.s_addr = host;
sin.sin_port = htons(port);
if (bind(*udp, (struct sockaddr*)&sin, sizeof(sin)) != 0) {
DEBUG(net, 0, "[udp] bind failed on %s:%i", inet_ntoa(*(struct in_addr *)&host), port);
return false;
}
if (broadcast) {
/* Enable broadcast */
unsigned long val = 1;
#ifndef BEOS_NET_SERVER // will work around this, some day; maybe.
setsockopt(*udp, SOL_SOCKET, SO_BROADCAST, (char *) &val , sizeof(val));
#endif
}
DEBUG(net, 1, "[udp] listening on port %s:%d", inet_ntoa(*(struct in_addr *)&host), port);
return true;
}
// Close UDP connection
void NetworkUDPClose(void)
{
DEBUG(net, 1, "[udp] closed listeners");
if (_network_udp_server) {
if (_udp_server_socket != INVALID_SOCKET) {
closesocket(_udp_server_socket);
_udp_server_socket = INVALID_SOCKET;
}
if (_udp_master_socket != INVALID_SOCKET) {
closesocket(_udp_master_socket);
_udp_master_socket = INVALID_SOCKET;
}
_network_udp_server = false;
_network_udp_broadcast = 0;
} else {
if (_udp_client_socket != INVALID_SOCKET) {
closesocket(_udp_client_socket);
_udp_client_socket = INVALID_SOCKET;
}
_network_udp_broadcast = 0;
}
}
// Receive something on UDP level
void NetworkUDPReceive(SOCKET udp)
{
struct sockaddr_in client_addr;
socklen_t client_len;
int nbytes;
static Packet *p = NULL;
int packet_len;
// If p is NULL, malloc him.. this prevents unneeded mallocs
if (p == NULL) p = malloc(sizeof(*p));
packet_len = sizeof(p->buffer);
client_len = sizeof(client_addr);
// Try to receive anything
nbytes = recvfrom(udp, p->buffer, packet_len, 0, (struct sockaddr *)&client_addr, &client_len);
// We got some bytes.. just asume we receive the whole packet
if (nbytes > 0) {
// Get the size of the buffer
p->size = (uint16)p->buffer[0];
p->size += (uint16)p->buffer[1] << 8;
// Put the position on the right place
p->pos = 2;
p->next = NULL;
// Handle the packet
NetworkHandleUDPPacket(p, &client_addr);
// Free the packet
free(p);
p = NULL;
}
}
// Broadcast to all ips
static void NetworkUDPBroadCast(SOCKET udp)
{
Packet* p = NetworkSend_Init(PACKET_UDP_CLIENT_FIND_SERVER);
uint i;
for (i = 0; _broadcast_list[i] != 0; i++) {
struct sockaddr_in out_addr;
out_addr.sin_family = AF_INET;
out_addr.sin_port = htons(_network_server_port);
out_addr.sin_addr.s_addr = _broadcast_list[i];
DEBUG(net, 4, "[udp] broadcasting to %s", inet_ntoa(out_addr.sin_addr));
NetworkSendUDP_Packet(udp, p, &out_addr);
}
free(p);
}
// Request the the server-list from the master server
void NetworkUDPQueryMasterServer(void)
{
struct sockaddr_in out_addr;
Packet *p;
if (_udp_client_socket == INVALID_SOCKET)
if (!NetworkUDPListen(&_udp_client_socket, 0, 0, true))
return;
p = NetworkSend_Init(PACKET_UDP_CLIENT_GET_LIST);
out_addr.sin_family = AF_INET;
out_addr.sin_port = htons(NETWORK_MASTER_SERVER_PORT);
out_addr.sin_addr.s_addr = NetworkResolveHost(NETWORK_MASTER_SERVER_HOST);
// packet only contains protocol version
NetworkSend_uint8(p, NETWORK_MASTER_SERVER_VERSION);
NetworkSendUDP_Packet(_udp_client_socket, p, &out_addr);
DEBUG(net, 2, "[udp] master server queried at %s:%d", inet_ntoa(out_addr.sin_addr),ntohs(out_addr.sin_port));
free(p);
}
// Find all servers
void NetworkUDPSearchGame(void)
{
// We are still searching..
if (_network_udp_broadcast > 0) return;
// No UDP-socket yet..
if (_udp_client_socket == INVALID_SOCKET)
if (!NetworkUDPListen(&_udp_client_socket, 0, 0, true))
return;
DEBUG(net, 0, "[udp] searching server");
NetworkUDPBroadCast(_udp_client_socket);
_network_udp_broadcast = 300; // Stay searching for 300 ticks
}
NetworkGameList *NetworkUDPQueryServer(const char* host, unsigned short port)
{
struct sockaddr_in out_addr;
Packet *p;
NetworkGameList *item;
// No UDP-socket yet..
if (_udp_client_socket == INVALID_SOCKET)
if (!NetworkUDPListen(&_udp_client_socket, 0, 0, true))
return NULL;
out_addr.sin_family = AF_INET;
out_addr.sin_port = htons(port);
out_addr.sin_addr.s_addr = NetworkResolveHost(host);
// Clear item in gamelist
item = NetworkGameListAddItem(inet_addr(inet_ntoa(out_addr.sin_addr)), ntohs(out_addr.sin_port));
memset(&item->info, 0, sizeof(item->info));
ttd_strlcpy(item->info.server_name, host, lengthof(item->info.server_name));
ttd_strlcpy(item->info.hostname, host, lengthof(item->info.hostname));
item->online = false;
// Init the packet
p = NetworkSend_Init(PACKET_UDP_CLIENT_FIND_SERVER);
NetworkSendUDP_Packet(_udp_client_socket, p, &out_addr);
free(p);
UpdateNetworkGameWindow(false);
return item;
}
/* Remove our advertise from the master-server */
void NetworkUDPRemoveAdvertise(void)
{
struct sockaddr_in out_addr;
Packet *p;
/* Check if we are advertising */
if (!_networking || !_network_server || !_network_udp_server) return;
/* check for socket */
if (_udp_master_socket == INVALID_SOCKET)
if (!NetworkUDPListen(&_udp_master_socket, _network_server_bind_ip, 0, false))
return;
DEBUG(net, 1, "[udp] removing advertise from master server");
/* Find somewhere to send */
out_addr.sin_family = AF_INET;
out_addr.sin_port = htons(NETWORK_MASTER_SERVER_PORT);
out_addr.sin_addr.s_addr = NetworkResolveHost(NETWORK_MASTER_SERVER_HOST);
/* Send the packet */
p = NetworkSend_Init(PACKET_UDP_SERVER_UNREGISTER);
/* Packet is: Version, server_port */
NetworkSend_uint8(p, NETWORK_MASTER_SERVER_VERSION);
NetworkSend_uint16(p, _network_server_port);
NetworkSendUDP_Packet(_udp_master_socket, p, &out_addr);
free(p);
}
/* Register us to the master server
This function checks if it needs to send an advertise */
void NetworkUDPAdvertise(void)
{
struct sockaddr_in out_addr;
Packet *p;
/* Check if we should send an advertise */
if (!_networking || !_network_server || !_network_udp_server || !_network_advertise)
return;
/* check for socket */
if (_udp_master_socket == INVALID_SOCKET)
if (!NetworkUDPListen(&_udp_master_socket, _network_server_bind_ip, 0, false))
return;
if (_network_need_advertise) {
_network_need_advertise = false;
_network_advertise_retries = ADVERTISE_RETRY_TIMES;
} else {
/* Only send once every ADVERTISE_NORMAL_INTERVAL ticks */
if (_network_advertise_retries == 0) {
if ((_network_last_advertise_frame + ADVERTISE_NORMAL_INTERVAL) > _frame_counter)
return;
_network_advertise_retries = ADVERTISE_RETRY_TIMES;
}
if ((_network_last_advertise_frame + ADVERTISE_RETRY_INTERVAL) > _frame_counter)
return;
}
_network_advertise_retries--;
_network_last_advertise_frame = _frame_counter;
/* Find somewhere to send */
out_addr.sin_family = AF_INET;
out_addr.sin_port = htons(NETWORK_MASTER_SERVER_PORT);
out_addr.sin_addr.s_addr = NetworkResolveHost(NETWORK_MASTER_SERVER_HOST);
DEBUG(net, 1, "[udp] advertising to master server");
/* Send the packet */
p = NetworkSend_Init(PACKET_UDP_SERVER_REGISTER);
/* Packet is: WELCOME_MESSAGE, Version, server_port */
NetworkSend_string(p, NETWORK_MASTER_SERVER_WELCOME_MESSAGE);
NetworkSend_uint8(p, NETWORK_MASTER_SERVER_VERSION);
NetworkSend_uint16(p, _network_server_port);
NetworkSendUDP_Packet(_udp_master_socket, p, &out_addr);
free(p);
}
void NetworkUDPInitialize(void)
{
_udp_client_socket = INVALID_SOCKET;
_udp_server_socket = INVALID_SOCKET;
_udp_master_socket = INVALID_SOCKET;
_network_udp_server = false;
_network_udp_broadcast = 0;
}
#endif /* ENABLE_NETWORK */
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