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Location: cpp/openttd-patchpack/source/src/network/core/udp.cpp - annotation
r8018:0bb6be7b55d7
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text/x-c
(svn r11578) -Codechange: Introduce the window default flag WDF_TEXTENTRY which specifies that the window holding it is actually one that enables an edit box.
Use this flag when dispatching a key event instead of using some hard coded window IDs.
This should ease a little bit the creation of new edit aware windows.
Use this flag when dispatching a key event instead of using some hard coded window IDs.
This should ease a little bit the creation of new edit aware windows.
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/**
* @file core/udp.cpp Basic functions to receive and send UDP packets.
*/
#ifdef ENABLE_NETWORK
#include "../../stdafx.h"
#include "../../debug.h"
#include "../../macros.h"
#include "../../helpers.hpp"
#include "packet.h"
#include "udp.h"
/**
* Start listening on the given host and port.
* @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 NetworkUDPSocketHandler::Listen(const uint32 host, const uint16 port, const bool broadcast)
{
struct sockaddr_in sin;
/* Make sure socket is closed */
this->Close();
this->sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (!this->IsConnected()) {
DEBUG(net, 0, "[udp] failed to start UDP listener");
return false;
}
SetNonBlocking(this->sock);
sin.sin_family = AF_INET;
/* Listen on all IPs */
sin.sin_addr.s_addr = host;
sin.sin_port = htons(port);
if (bind(this->sock, (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(this->sock, 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 the given UDP socket
*/
void NetworkUDPSocketHandler::Close()
{
if (!this->IsConnected()) return;
closesocket(this->sock);
this->sock = INVALID_SOCKET;
}
NetworkRecvStatus NetworkUDPSocketHandler::CloseConnection()
{
this->has_quit = true;
return NETWORK_RECV_STATUS_OKAY;
}
/**
* Send a packet over UDP
* @param p the packet to send
* @param recv the receiver (target) of the packet
*/
void NetworkUDPSocketHandler::SendPacket(Packet *p, const struct sockaddr_in *recv)
{
int res;
p->PrepareToSend();
/* Send the buffer */
res = sendto(this->sock, (const char*)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());
}
/**
* Receive a packet at UDP level
*/
void NetworkUDPSocketHandler::ReceivePackets()
{
struct sockaddr_in client_addr;
socklen_t client_len;
int nbytes;
Packet p(this);
int packet_len;
if (!this->IsConnected()) return;
packet_len = sizeof(p.buffer);
client_len = sizeof(client_addr);
/* Try to receive anything */
SetNonBlocking(this->sock); // Some OSes seem to loose the non-blocking status of the socket
nbytes = recvfrom(this->sock, (char*)p.buffer, packet_len, 0, (struct sockaddr *)&client_addr, &client_len);
/* We got some bytes for the base header of the packet. */
if (nbytes > 2) {
p.PrepareToRead();
/* If the size does not match the packet must be corrupted.
* Otherwise it will be marked as corrupted later on. */
if (nbytes != p.size) {
DEBUG(net, 1, "received a packet with mismatching size from %s:%d",
inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
return;
}
/* Handle the packet */
this->HandleUDPPacket(&p, &client_addr);
}
}
/**
* Serializes the NetworkGameInfo struct to the packet
* @param p the packet to write the data to
* @param info the NetworkGameInfo struct to serialize
*/
void NetworkUDPSocketHandler::Send_NetworkGameInfo(Packet *p, const NetworkGameInfo *info)
{
p->Send_uint8 (NETWORK_GAME_INFO_VERSION);
/*
* Please observe the order.
* The parts must be read in the same order as they are sent!
*/
/* Update the documentation in udp.h on changes
* to the NetworkGameInfo wire-protocol! */
/* 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++;
}
p->Send_uint8 (count); // Send number of GRFs
/* Send actual GRF Identifications */
for (c = info->grfconfig; c != NULL; c = c->next) {
if (!HasBit(c->flags, GCF_STATIC)) this->Send_GRFIdentifier(p, c);
}
}
/* NETWORK_GAME_INFO_VERSION = 3 */
p->Send_uint32(info->game_date);
p->Send_uint32(info->start_date);
/* NETWORK_GAME_INFO_VERSION = 2 */
p->Send_uint8 (info->companies_max);
p->Send_uint8 (info->companies_on);
p->Send_uint8 (info->spectators_max);
/* NETWORK_GAME_INFO_VERSION = 1 */
p->Send_string(info->server_name);
p->Send_string(info->server_revision);
p->Send_uint8 (info->server_lang);
p->Send_bool (info->use_password);
p->Send_uint8 (info->clients_max);
p->Send_uint8 (info->clients_on);
p->Send_uint8 (info->spectators_on);
p->Send_string(info->map_name);
p->Send_uint16(info->map_width);
p->Send_uint16(info->map_height);
p->Send_uint8 (info->map_set);
p->Send_bool (info->dedicated);
}
/**
* Deserializes the NetworkGameInfo struct from the packet
* @param p the packet to read the data from
* @param info the NetworkGameInfo to deserialize into
*/
void NetworkUDPSocketHandler::Recv_NetworkGameInfo(Packet *p, NetworkGameInfo *info)
{
static const Date MAX_DATE = ConvertYMDToDate(MAX_YEAR, 11, 31); // December is month 11
info->game_info_version = p->Recv_uint8();
/*
* Please observe the order.
* The parts must be read in the same order as they are sent!
*/
/* Update the documentation in udp.h on changes
* to the NetworkGameInfo wire-protocol! */
switch (info->game_info_version) {
case 4: {
GRFConfig **dst = &info->grfconfig;
uint i;
uint num_grfs = p->Recv_uint8();
for (i = 0; i < num_grfs; i++) {
GRFConfig *c = CallocT<GRFConfig>(1);
this->Recv_GRFIdentifier(p, c);
this->HandleIncomingNetworkGameInfoGRFConfig(c);
/* Append GRFConfig to the list */
*dst = c;
dst = &c->next;
}
} /* Fallthrough */
case 3:
info->game_date = Clamp(p->Recv_uint32(), 0, MAX_DATE);
info->start_date = Clamp(p->Recv_uint32(), 0, MAX_DATE);
/* Fallthrough */
case 2:
info->companies_max = p->Recv_uint8 ();
info->companies_on = p->Recv_uint8 ();
info->spectators_max = p->Recv_uint8 ();
/* Fallthrough */
case 1:
p->Recv_string(info->server_name, sizeof(info->server_name));
p->Recv_string(info->server_revision, sizeof(info->server_revision));
info->server_lang = p->Recv_uint8 ();
info->use_password = p->Recv_bool ();
info->clients_max = p->Recv_uint8 ();
info->clients_on = p->Recv_uint8 ();
info->spectators_on = p->Recv_uint8 ();
if (info->game_info_version < 3) { // 16 bits dates got scrapped and are read earlier
info->game_date = p->Recv_uint16() + DAYS_TILL_ORIGINAL_BASE_YEAR;
info->start_date = p->Recv_uint16() + DAYS_TILL_ORIGINAL_BASE_YEAR;
}
p->Recv_string(info->map_name, sizeof(info->map_name));
info->map_width = p->Recv_uint16();
info->map_height = p->Recv_uint16();
info->map_set = p->Recv_uint8 ();
info->dedicated = p->Recv_bool ();
if (info->server_lang >= NETWORK_NUM_LANGUAGES) info->server_lang = 0;
if (info->map_set >= NETWORK_NUM_LANDSCAPES) info->map_set = 0;
}
}
/**
* Defines a simple (switch) case for each network packet
* @param type the packet type to create the case for
*/
#define UDP_COMMAND(type) case type: this->NetworkPacketReceive_ ## type ## _command(p, client_addr); break;
/**
* Handle an incoming packets by sending it to the correct function.
* @param p the received packet
* @param client_addr the sender of the packet
*/
void NetworkUDPSocketHandler::HandleUDPPacket(Packet *p, const struct sockaddr_in *client_addr)
{
PacketUDPType type;
/* New packet == new client, which has not quit yet */
this->has_quit = false;
type = (PacketUDPType)p->Recv_uint8();
switch (this->HasClientQuit() ? PACKET_UDP_END : type) {
UDP_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER);
UDP_COMMAND(PACKET_UDP_SERVER_RESPONSE);
UDP_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO);
UDP_COMMAND(PACKET_UDP_SERVER_DETAIL_INFO);
UDP_COMMAND(PACKET_UDP_SERVER_REGISTER);
UDP_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER);
UDP_COMMAND(PACKET_UDP_CLIENT_GET_LIST);
UDP_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST);
UDP_COMMAND(PACKET_UDP_SERVER_UNREGISTER);
UDP_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS);
UDP_COMMAND(PACKET_UDP_SERVER_NEWGRFS);
default:
if (this->HasClientQuit()) {
DEBUG(net, 0, "[udp] received invalid packet type %d from %s:%d", type, inet_ntoa(client_addr->sin_addr), ntohs(client_addr->sin_port));
} else {
DEBUG(net, 0, "[udp] received illegal packet from %s:%d", inet_ntoa(client_addr->sin_addr), ntohs(client_addr->sin_port));
}
break;
}
}
/**
* Create stub implementations for all receive commands that only
* show a warning that the given command is not available for the
* socket where the packet came from.
* @param type the packet type to create the stub for
*/
#define DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(type) \
void NetworkUDPSocketHandler::NetworkPacketReceive_## type ##_command(\
Packet *p, const struct sockaddr_in *client_addr) { \
DEBUG(net, 0, "[udp] received packet type %d on wrong port from %s:%d", \
type, inet_ntoa(client_addr->sin_addr), ntohs(client_addr->sin_port)); \
}
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER);
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE);
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO);
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_DETAIL_INFO);
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_REGISTER);
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER);
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_LIST);
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST);
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_UNREGISTER);
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS);
DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS);
#endif /* ENABLE_NETWORK */
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