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Location: cpp/openttd-patchpack/source/src/network/core/udp.c
r5520:aa1247f0561e
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(svn r7823) -Fix (r7384 / r7368 / r3757 / r7388): News windows could still cause crashes because
DeleteVehicleNews shuffles around _news_items which can wreak havoc with the NewsItem*
of a currently open news window. While here also correctly update _current_news and
_forced_news for the same reasons. Should really work now.
DeleteVehicleNews shuffles around _news_items which can wreak havoc with the NewsItem*
of a currently open news window. While here also correctly update _current_news and
_forced_news for the same reasons. Should really work now.
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#ifdef ENABLE_NETWORK
#include "../../stdafx.h"
#include "../../date.h"
#include "../../debug.h"
#include "../../macros.h"
#include "../../newgrf_config.h"
#include "os_abstraction.h"
#include "config.h"
#include "game.h"
#include "packet.h"
#include "udp.h"
/**
* @file udp.c Basic functions to receive and send UDP packets.
*/
/**
* Send a packet over UDP
* @param udp the socket to send over
* @param p the packet to send
* @param recv the receiver (target) of the packet
*/
void NetworkSendUDP_Packet(SOCKET udp, Packet *p, struct sockaddr_in *recv)
{
int res;
NetworkSend_FillPacketSize(p);
/* 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 listening on the given host and port.
* @param udp the place where the (references to the) UDP are stored
* @param host the host (ip) to listen on
* @param port the port to listen on
* @param broadcast whether to allow broadcast sending/receiving
* @return true if the listening succeeded
*/
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;
}
/**
* Receive a packet at UDP level
* @param udp the socket to receive the packet on
*/
void NetworkUDPReceive(SOCKET udp)
{
struct sockaddr_in client_addr;
socklen_t client_len;
int nbytes;
Packet p;
int packet_len;
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 for the base header of the packet.
* Assume we received the whole packet. */
if (nbytes > 2) {
NetworkRecv_ReadPacketSize(&p);
/* Put the position on the right place */
p.pos = 2;
p.next = NULL;
/* Handle the packet */
NetworkHandleUDPPacket(udp, &p, &client_addr);
}
}
/**
* 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
*/
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 cs the client state (for closing connect on out-of-bounds reading etc)
* @param p the packet to read the data from
* @param c the configuration to write the GRF ID and MD5 checksum to
*/
void NetworkRecv_GRFIdentifier(NetworkClientState *cs, Packet *p, GRFConfig *c)
{
uint j;
c->grfid = NetworkRecv_uint32(cs, p);
for (j = 0; j < sizeof(c->md5sum); j++) {
c->md5sum[j] = NetworkRecv_uint8(cs, p);
}
}
/**
* Serializes the NetworkGameInfo struct to the packet
* @param p the packet to write the data to
* @param info the NetworkGameInfo struct to serialize
*/
void NetworkSend_NetworkGameInfo(Packet *p, const NetworkGameInfo *info)
{
NetworkSend_uint8 (p, NETWORK_GAME_INFO_VERSION);
/*
* Please observe the order.
* The parts must be read in the same order as they are sent!
*/
/* 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 count = 0;
/* Count number of GRFs to send information about */
for (c = info->grfconfig; c != NULL; c = c->next) {
if (!HASBIT(c->flags, GCF_STATIC)) count++;
}
NetworkSend_uint8 (p, count); // Send number of GRFs
/* Send actual GRF Identifications */
for (c = info->grfconfig; c != NULL; c = c->next) {
if (!HASBIT(c->flags, GCF_STATIC)) NetworkSend_GRFIdentifier(p, c);
}
}
/* NETWORK_GAME_INFO_VERSION = 3 */
NetworkSend_uint32(p, info->game_date);
NetworkSend_uint32(p, info->start_date);
/* NETWORK_GAME_INFO_VERSION = 2 */
NetworkSend_uint8 (p, info->companies_max);
NetworkSend_uint8 (p, info->companies_on);
NetworkSend_uint8 (p, info->spectators_max);
/* NETWORK_GAME_INFO_VERSION = 1 */
NetworkSend_string(p, info->server_name);
NetworkSend_string(p, info->server_revision);
NetworkSend_uint8 (p, info->server_lang);
NetworkSend_uint8 (p, info->use_password);
NetworkSend_uint8 (p, info->clients_max);
NetworkSend_uint8 (p, info->clients_on);
NetworkSend_uint8 (p, info->spectators_on);
NetworkSend_string(p, info->map_name);
NetworkSend_uint16(p, info->map_width);
NetworkSend_uint16(p, info->map_height);
NetworkSend_uint8 (p, info->map_set);
NetworkSend_uint8 (p, info->dedicated);
}
/**
* Deserializes the NetworkGameInfo struct from the packet
* @param cs the client state (for closing connect on out-of-bounds reading etc)
* @param p the packet to read the data from
* @param info the NetworkGameInfo to deserialize into
*/
void NetworkRecv_NetworkGameInfo(NetworkClientState *cs, Packet *p, NetworkGameInfo *info)
{
info->game_info_version = NetworkRecv_uint8(cs, p);
/*
* Please observe the order.
* The parts must be read in the same order as they are sent!
*/
switch (info->game_info_version) {
case 4: {
GRFConfig *c, **dst = &info->grfconfig;
uint i;
uint num_grfs = NetworkRecv_uint8(cs, p);
for (i = 0; i < num_grfs; i++) {
c = calloc(1, sizeof(*c));
NetworkRecv_GRFIdentifier(cs, p, c);
HandleIncomingNetworkGameInfoGRFConfig(c);
/* Append GRFConfig to the list */
*dst = c;
dst = &c->next;
}
} /* Fallthrough */
case 3:
info->game_date = NetworkRecv_uint32(cs, p);
info->start_date = NetworkRecv_uint32(cs, p);
/* Fallthrough */
case 2:
info->companies_max = NetworkRecv_uint8 (cs, p);
info->companies_on = NetworkRecv_uint8 (cs, p);
info->spectators_max = NetworkRecv_uint8 (cs, p);
/* Fallthrough */
case 1:
NetworkRecv_string(cs, p, info->server_name, sizeof(info->server_name));
NetworkRecv_string(cs, p, info->server_revision, sizeof(info->server_revision));
info->server_lang = NetworkRecv_uint8 (cs, p);
info->use_password = NetworkRecv_uint8 (cs, p);
info->clients_max = NetworkRecv_uint8 (cs, p);
info->clients_on = NetworkRecv_uint8 (cs, p);
info->spectators_on = NetworkRecv_uint8 (cs, p);
if (info->game_info_version < 3) { // 16 bits dates got scrapped and are read earlier
info->game_date = NetworkRecv_uint16(cs, p) + DAYS_TILL_ORIGINAL_BASE_YEAR;
info->start_date = NetworkRecv_uint16(cs, p) + DAYS_TILL_ORIGINAL_BASE_YEAR;
}
NetworkRecv_string(cs, p, info->map_name, sizeof(info->map_name));
info->map_width = NetworkRecv_uint16(cs, p);
info->map_height = NetworkRecv_uint16(cs, p);
info->map_set = NetworkRecv_uint8 (cs, p);
info->dedicated = NetworkRecv_uint8 (cs, p);
}
}
#endif /* ENABLE_NETWORK */
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