mirror of https://github.com/OpenTTD/OpenTTD.git
285 lines
8.1 KiB
C
285 lines
8.1 KiB
C
/* $Id$ */
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#ifdef ENABLE_NETWORK
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#include "../../stdafx.h"
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#include "../../debug.h"
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#include "../../macros.h"
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#include "packet.h"
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#include "udp.h"
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/**
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* @file udp.c Basic functions to receive and send UDP packets.
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*/
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/**
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* Start listening on the given host and port.
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* @param udp the place where the (references to the) UDP are stored
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* @param host the host (ip) to listen on
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* @param port the port to listen on
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* @param broadcast whether to allow broadcast sending/receiving
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* @return true if the listening succeeded
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*/
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bool NetworkUDPListen(SOCKET *udp, const uint32 host, const uint16 port, const bool broadcast)
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{
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struct sockaddr_in sin;
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/* Make sure socket is closed */
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closesocket(*udp);
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*udp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (*udp == INVALID_SOCKET) {
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DEBUG(net, 0, "[udp] failed to start UDP listener");
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return false;
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}
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/* set nonblocking mode for socket */
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{
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unsigned long blocking = 1;
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#ifndef BEOS_NET_SERVER
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ioctlsocket(*udp, FIONBIO, &blocking);
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#else
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setsockopt(*udp, SOL_SOCKET, SO_NONBLOCK, &blocking, NULL);
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#endif
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}
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sin.sin_family = AF_INET;
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/* Listen on all IPs */
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sin.sin_addr.s_addr = host;
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sin.sin_port = htons(port);
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if (bind(*udp, (struct sockaddr*)&sin, sizeof(sin)) != 0) {
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DEBUG(net, 0, "[udp] bind failed on %s:%i", inet_ntoa(*(struct in_addr *)&host), port);
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return false;
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}
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if (broadcast) {
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/* Enable broadcast */
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unsigned long val = 1;
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#ifndef BEOS_NET_SERVER // will work around this, some day; maybe.
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setsockopt(*udp, SOL_SOCKET, SO_BROADCAST, (char *) &val , sizeof(val));
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#endif
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}
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DEBUG(net, 1, "[udp] listening on port %s:%d", inet_ntoa(*(struct in_addr *)&host), port);
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return true;
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}
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/**
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* Close the given UDP socket
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* @param udp the socket to close
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*/
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void NetworkUDPClose(SOCKET *udp)
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{
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if (*udp == INVALID_SOCKET) return;
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closesocket(*udp);
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*udp = INVALID_SOCKET;
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}
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/**
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* Send a packet over UDP
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* @param udp the socket to send over
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* @param p the packet to send
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* @param recv the receiver (target) of the packet
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*/
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void NetworkSendUDP_Packet(const SOCKET udp, Packet *p, const struct sockaddr_in *recv)
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{
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int res;
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NetworkSend_FillPacketSize(p);
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/* Send the buffer */
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res = sendto(udp, p->buffer, p->size, 0, (struct sockaddr *)recv, sizeof(*recv));
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/* Check for any errors, but ignore it otherwise */
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if (res == -1) DEBUG(net, 1, "[udp] sendto failed with: %i", GET_LAST_ERROR());
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}
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/**
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* Receive a packet at UDP level
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* @param udp the socket to receive the packet on
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*/
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void NetworkUDPReceive(const SOCKET udp)
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{
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struct sockaddr_in client_addr;
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socklen_t client_len;
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int nbytes;
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Packet p;
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int packet_len;
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packet_len = sizeof(p.buffer);
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client_len = sizeof(client_addr);
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/* Try to receive anything */
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nbytes = recvfrom(udp, p.buffer, packet_len, 0, (struct sockaddr *)&client_addr, &client_len);
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/* We got some bytes for the base header of the packet.
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* Assume we received the whole packet. */
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if (nbytes > 2) {
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NetworkRecv_ReadPacketSize(&p);
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/* Put the position on the right place */
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p.pos = 2;
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p.next = NULL;
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/* Handle the packet */
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NetworkHandleUDPPacket(udp, &p, &client_addr);
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}
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}
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/**
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* Serializes the GRFIdentifier (GRF ID and MD5 checksum) to the packet
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* @param p the packet to write the data to
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* @param c the configuration to write the GRF ID and MD5 checksum from
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*/
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void NetworkSend_GRFIdentifier(Packet *p, const GRFConfig *c)
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{
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uint j;
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NetworkSend_uint32(p, c->grfid);
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for (j = 0; j < sizeof(c->md5sum); j++) {
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NetworkSend_uint8 (p, c->md5sum[j]);
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}
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}
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/**
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* Deserializes the GRFIdentifier (GRF ID and MD5 checksum) from the packet
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* @param cs the client state (for closing connect on out-of-bounds reading etc)
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* @param p the packet to read the data from
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* @param c the configuration to write the GRF ID and MD5 checksum to
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*/
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void NetworkRecv_GRFIdentifier(NetworkClientState *cs, Packet *p, GRFConfig *c)
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{
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uint j;
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c->grfid = NetworkRecv_uint32(cs, p);
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for (j = 0; j < sizeof(c->md5sum); j++) {
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c->md5sum[j] = NetworkRecv_uint8(cs, p);
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}
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}
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/**
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* Serializes the NetworkGameInfo struct to the packet
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* @param p the packet to write the data to
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* @param info the NetworkGameInfo struct to serialize
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*/
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void NetworkSend_NetworkGameInfo(Packet *p, const NetworkGameInfo *info)
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{
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NetworkSend_uint8 (p, NETWORK_GAME_INFO_VERSION);
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/*
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* Please observe the order.
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* The parts must be read in the same order as they are sent!
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*/
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/* NETWORK_GAME_INFO_VERSION = 4 */
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{
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/* Only send the GRF Identification (GRF_ID and MD5 checksum) of
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* the GRFs that are needed, i.e. the ones that the server has
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* selected in the NewGRF GUI and not the ones that are used due
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* to the fact that they are in [newgrf-static] in openttd.cfg */
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const GRFConfig *c;
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uint count = 0;
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/* Count number of GRFs to send information about */
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for (c = info->grfconfig; c != NULL; c = c->next) {
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if (!HASBIT(c->flags, GCF_STATIC)) count++;
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}
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NetworkSend_uint8 (p, count); // Send number of GRFs
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/* Send actual GRF Identifications */
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for (c = info->grfconfig; c != NULL; c = c->next) {
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if (!HASBIT(c->flags, GCF_STATIC)) NetworkSend_GRFIdentifier(p, c);
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}
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}
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/* NETWORK_GAME_INFO_VERSION = 3 */
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NetworkSend_uint32(p, info->game_date);
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NetworkSend_uint32(p, info->start_date);
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/* NETWORK_GAME_INFO_VERSION = 2 */
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NetworkSend_uint8 (p, info->companies_max);
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NetworkSend_uint8 (p, info->companies_on);
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NetworkSend_uint8 (p, info->spectators_max);
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/* NETWORK_GAME_INFO_VERSION = 1 */
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NetworkSend_string(p, info->server_name);
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NetworkSend_string(p, info->server_revision);
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NetworkSend_uint8 (p, info->server_lang);
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NetworkSend_uint8 (p, info->use_password);
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NetworkSend_uint8 (p, info->clients_max);
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NetworkSend_uint8 (p, info->clients_on);
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NetworkSend_uint8 (p, info->spectators_on);
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NetworkSend_string(p, info->map_name);
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NetworkSend_uint16(p, info->map_width);
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NetworkSend_uint16(p, info->map_height);
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NetworkSend_uint8 (p, info->map_set);
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NetworkSend_uint8 (p, info->dedicated);
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}
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/**
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* Deserializes the NetworkGameInfo struct from the packet
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* @param cs the client state (for closing connect on out-of-bounds reading etc)
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* @param p the packet to read the data from
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* @param info the NetworkGameInfo to deserialize into
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*/
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void NetworkRecv_NetworkGameInfo(NetworkClientState *cs, Packet *p, NetworkGameInfo *info)
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{
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info->game_info_version = NetworkRecv_uint8(cs, p);
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/*
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* Please observe the order.
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* The parts must be read in the same order as they are sent!
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*/
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switch (info->game_info_version) {
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case 4: {
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GRFConfig *c, **dst = &info->grfconfig;
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uint i;
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uint num_grfs = NetworkRecv_uint8(cs, p);
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for (i = 0; i < num_grfs; i++) {
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c = calloc(1, sizeof(*c));
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NetworkRecv_GRFIdentifier(cs, p, c);
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HandleIncomingNetworkGameInfoGRFConfig(c);
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/* Append GRFConfig to the list */
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*dst = c;
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dst = &c->next;
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}
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} /* Fallthrough */
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case 3:
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info->game_date = NetworkRecv_uint32(cs, p);
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info->start_date = NetworkRecv_uint32(cs, p);
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/* Fallthrough */
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case 2:
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info->companies_max = NetworkRecv_uint8 (cs, p);
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info->companies_on = NetworkRecv_uint8 (cs, p);
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info->spectators_max = NetworkRecv_uint8 (cs, p);
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/* Fallthrough */
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case 1:
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NetworkRecv_string(cs, p, info->server_name, sizeof(info->server_name));
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NetworkRecv_string(cs, p, info->server_revision, sizeof(info->server_revision));
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info->server_lang = NetworkRecv_uint8 (cs, p);
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info->use_password = NetworkRecv_uint8 (cs, p);
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info->clients_max = NetworkRecv_uint8 (cs, p);
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info->clients_on = NetworkRecv_uint8 (cs, p);
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info->spectators_on = NetworkRecv_uint8 (cs, p);
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if (info->game_info_version < 3) { // 16 bits dates got scrapped and are read earlier
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info->game_date = NetworkRecv_uint16(cs, p) + DAYS_TILL_ORIGINAL_BASE_YEAR;
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info->start_date = NetworkRecv_uint16(cs, p) + DAYS_TILL_ORIGINAL_BASE_YEAR;
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}
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NetworkRecv_string(cs, p, info->map_name, sizeof(info->map_name));
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info->map_width = NetworkRecv_uint16(cs, p);
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info->map_height = NetworkRecv_uint16(cs, p);
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info->map_set = NetworkRecv_uint8 (cs, p);
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info->dedicated = NetworkRecv_uint8 (cs, p);
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}
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}
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#endif /* ENABLE_NETWORK */
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