author | celestar |
Thu, 11 Jan 2007 13:16:26 +0000 | |
branch | custombridgeheads |
changeset 5648 | 1608018c5ff2 |
parent 5643 | 3778051e8095 |
permissions | -rw-r--r-- |
5642 | 1 |
/* $Id$ */ |
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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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NetworkUDPClose(udp); |
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*udp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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31 |
if (*udp == INVALID_SOCKET) { |
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32 |
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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39 |
#ifndef BEOS_NET_SERVER |
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ioctlsocket(*udp, FIONBIO, &blocking); |
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41 |
#else |
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setsockopt(*udp, SOL_SOCKET, SO_NONBLOCK, &blocking, NULL); |
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43 |
#endif |
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44 |
} |
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46 |
sin.sin_family = AF_INET; |
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/* Listen on all IPs */ |
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48 |
sin.sin_addr.s_addr = host; |
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49 |
sin.sin_port = htons(port); |
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51 |
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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53 |
return false; |
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54 |
} |
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56 |
if (broadcast) { |
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/* Enable broadcast */ |
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58 |
unsigned long val = 1; |
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59 |
#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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61 |
#endif |
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62 |
} |
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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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/** |
5642 | 102 |
* 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) |
5642 | 106 |
{ |
107 |
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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113 |
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. */ |
5642 | 120 |
if (nbytes > 2) { |
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NetworkRecv_ReadPacketSize(&p); |
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/* If the size does not match the packet must be corrupted. |
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* Otherwise it will be marked as corrupted later on. */ |
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if (nbytes != p.size) { |
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DEBUG(net, 1, "received a packet with mismatching size from %s:%d", |
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inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port)); |
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return; |
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} |
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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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156 |
/** |
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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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181 |
/* |
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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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/* Update the documentation in udp.h on changes |
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* to the NetworkGameInfo wire-protocol! */ |
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/* NETWORK_GAME_INFO_VERSION = 4 */ |
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190 |
{ |
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191 |
/* Only send the GRF Identification (GRF_ID and MD5 checksum) of |
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192 |
* 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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195 |
const GRFConfig *c; |
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196 |
uint count = 0; |
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198 |
/* 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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200 |
if (!HASBIT(c->flags, GCF_STATIC)) count++; |
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201 |
} |
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202 |
NetworkSend_uint8 (p, count); // Send number of GRFs |
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203 |
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204 |
/* Send actual GRF Identifications */ |
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205 |
for (c = info->grfconfig; c != NULL; c = c->next) { |
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206 |
if (!HASBIT(c->flags, GCF_STATIC)) NetworkSend_GRFIdentifier(p, c); |
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207 |
} |
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208 |
} |
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209 |
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210 |
/* NETWORK_GAME_INFO_VERSION = 3 */ |
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211 |
NetworkSend_uint32(p, info->game_date); |
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NetworkSend_uint32(p, info->start_date); |
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214 |
/* NETWORK_GAME_INFO_VERSION = 2 */ |
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NetworkSend_uint8 (p, info->companies_max); |
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216 |
NetworkSend_uint8 (p, info->companies_on); |
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217 |
NetworkSend_uint8 (p, info->spectators_max); |
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218 |
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219 |
/* 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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226 |
NetworkSend_uint8 (p, info->spectators_on); |
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227 |
NetworkSend_string(p, info->map_name); |
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228 |
NetworkSend_uint16(p, info->map_width); |
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229 |
NetworkSend_uint16(p, info->map_height); |
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NetworkSend_uint8 (p, info->map_set); |
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231 |
NetworkSend_uint8 (p, info->dedicated); |
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232 |
} |
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233 |
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234 |
/** |
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235 |
* Deserializes the NetworkGameInfo struct from the packet |
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236 |
* @param cs the client state (for closing connect on out-of-bounds reading etc) |
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237 |
* @param p the packet to read the data from |
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238 |
* @param info the NetworkGameInfo to deserialize into |
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239 |
*/ |
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240 |
void NetworkRecv_NetworkGameInfo(NetworkClientState *cs, Packet *p, NetworkGameInfo *info) |
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241 |
{ |
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242 |
info->game_info_version = NetworkRecv_uint8(cs, p); |
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243 |
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244 |
/* |
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245 |
* Please observe the order. |
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246 |
* The parts must be read in the same order as they are sent! |
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247 |
*/ |
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/* Update the documentation in udp.h on changes |
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* to the NetworkGameInfo wire-protocol! */ |
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switch (info->game_info_version) { |
253 |
case 4: { |
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254 |
GRFConfig *c, **dst = &info->grfconfig; |
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255 |
uint i; |
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256 |
uint num_grfs = NetworkRecv_uint8(cs, p); |
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257 |
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258 |
for (i = 0; i < num_grfs; i++) { |
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259 |
c = calloc(1, sizeof(*c)); |
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260 |
NetworkRecv_GRFIdentifier(cs, p, c); |
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261 |
HandleIncomingNetworkGameInfoGRFConfig(c); |
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262 |
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263 |
/* Append GRFConfig to the list */ |
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264 |
*dst = c; |
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265 |
dst = &c->next; |
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266 |
} |
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267 |
} /* Fallthrough */ |
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268 |
case 3: |
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269 |
info->game_date = NetworkRecv_uint32(cs, p); |
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270 |
info->start_date = NetworkRecv_uint32(cs, p); |
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271 |
/* Fallthrough */ |
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272 |
case 2: |
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273 |
info->companies_max = NetworkRecv_uint8 (cs, p); |
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274 |
info->companies_on = NetworkRecv_uint8 (cs, p); |
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275 |
info->spectators_max = NetworkRecv_uint8 (cs, p); |
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276 |
/* Fallthrough */ |
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277 |
case 1: |
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278 |
NetworkRecv_string(cs, p, info->server_name, sizeof(info->server_name)); |
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279 |
NetworkRecv_string(cs, p, info->server_revision, sizeof(info->server_revision)); |
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280 |
info->server_lang = NetworkRecv_uint8 (cs, p); |
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281 |
info->use_password = NetworkRecv_uint8 (cs, p); |
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282 |
info->clients_max = NetworkRecv_uint8 (cs, p); |
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283 |
info->clients_on = NetworkRecv_uint8 (cs, p); |
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284 |
info->spectators_on = NetworkRecv_uint8 (cs, p); |
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285 |
if (info->game_info_version < 3) { // 16 bits dates got scrapped and are read earlier |
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286 |
info->game_date = NetworkRecv_uint16(cs, p) + DAYS_TILL_ORIGINAL_BASE_YEAR; |
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287 |
info->start_date = NetworkRecv_uint16(cs, p) + DAYS_TILL_ORIGINAL_BASE_YEAR; |
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288 |
} |
|
289 |
NetworkRecv_string(cs, p, info->map_name, sizeof(info->map_name)); |
|
290 |
info->map_width = NetworkRecv_uint16(cs, p); |
|
291 |
info->map_height = NetworkRecv_uint16(cs, p); |
|
292 |
info->map_set = NetworkRecv_uint8 (cs, p); |
|
293 |
info->dedicated = NetworkRecv_uint8 (cs, p); |
|
294 |
} |
|
295 |
} |
|
296 |
||
297 |
#endif /* ENABLE_NETWORK */ |