engine/src/network/BroadcastClient.cpp

   1 /*
   2 Copyright (C) 2008  Mathias Gottschlag
   3
   4 Permission is hereby granted, free of charge, to any person obtaining a copy of
   5 this software and associated documentation files (the "Software"), to deal in the
   6 Software without restriction, including without limitation the rights to use,
   7 copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
   8 Software, and to permit persons to whom the Software is furnished to do so,
   9 subject to the following conditions:
  10
  11 The above copyright notice and this permission notice shall be included in all
  12 copies or substantial portions of the Software.
  13
  14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
  15 INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
  16 PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  17 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  18 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  19 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20 */
  21
  22 #include "network/BroadcastClient.h"
  23 //#include "core/Script.h"
  24 #include "core/Logger.h"
  25
  26 #include <errno.h>
  27
  28 namespace peak
  29 {
  30         BroadcastClient::BroadcastClient()
  31         {
  32                 port = 0;
  33                 bcclients.push_back(this);
  34                 //cbscript = 0;
  35         }
  36         BroadcastClient::~BroadcastClient()
  37         {
  38                 for (unsigned int i = 0; i < bcclients.size(); i++)
  39                 {
  40                         if (bcclients[i] == this)
  41                         {
  42                                 bcclients.erase(bcclients.begin() + i);
  43                                 return;
  44                         }
  45                 }
  46         }
  47
  48         void BroadcastClient::start(int port)
  49         {
  50                 // Create raw socket
  51                 ENetAddress address;
  52                 address.host = ENET_HOST_ANY;
  53                 address.port = ENET_PORT_ANY;
  54                 socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM, &address);
  55                 // enet 1.2 needs ENET_SOCKOPT_NONBLOCK, enet 1.1 does not provide it.
  56                 #ifdef _ENET_1_2_
  57                 enet_socket_set_option(socket, ENET_SOCKOPT_NONBLOCK, 1);
  58                 #endif
  59                 /*if (enet_socket_set_option(socket, ENET_SOCKOPT_BROADCAST, 1) == -1)
  60                 {
  61                         perror("ENET_SOCKOPT_BROADCAST");
  62                 }*/
  63                 this->port = port;
  64                 updatetime = 1000;
  65                 LERROR("Started broadcast client (%d).\n", port);
  66         }
  67         void BroadcastClient::stop(void)
  68         {
  69                 enet_socket_destroy(socket);
  70                 port = 0;
  71         }
  72
  73         void BroadcastClient::clearList(void)
  74         {
  75                 serverinfo.clear();
  76                 serveraddr.clear();
  77         }
  78
  79         int BroadcastClient::getServerCount(void)
  80         {
  81                 return serverinfo.size();
  82         }
  83         std::string BroadcastClient::getServerInfo(int index)
  84         {
  85                 return serverinfo[index];
  86         }
  87         Address BroadcastClient::getServerAddress(int index)
  88         {
  89                 return serveraddr[index];
  90         }
  91
  92         void BroadcastClient::setCallback(Script *script, std::string function)
  93         {
  94                 cbscript = script;
  95                 cbfunc = function;
  96         }
  97
  98         void BroadcastClient::doWork(float msecs)
  99         {
 100                 if (!port)
 101                         return;
 102
 103
 104                 //printf("BroadcastClient: doWork().\n");
 105
 106                 ENetBuffer buffer;
 107                 buffer.data = malloc(1024);
 108                 buffer.dataLength = 1024;
 109                 ENetAddress remoteaddr;
 110                 // Broadcast address
 111                 ENetAddress bcaddr;
 112                 bcaddr.host = ENET_HOST_BROADCAST;
 113                 bcaddr.port = 14141;
 114                 enet_address_set_host(&bcaddr, "127.0.0.1");
 115
 116                 // Message to be sent to all hosts
 117                 char msg[] = "PING";
 118                 ENetBuffer msgbuffer;
 119                 msgbuffer.data = msg;
 120                 msgbuffer.dataLength = 4;
 121
 122
 123                 // Broadcast
 124                 updatetime += msecs;
 125                 if (updatetime > 250)
 126                 {
 127                         LERROR("Sending.\n");
 128                         if (enet_socket_send(socket, &bcaddr, &msgbuffer, 1) == -1)
 129                         {
 130                                 perror("Sending failed");
 131                         }
 132                         updatetime = 0;
 133                 }
 134
 135
 136                 // Receive answers
 137                 bool listchanged = false;
 138                 int length;
 139                 while ((length = enet_socket_receive(socket, &remoteaddr, &buffer, 1) > 0)
 140                                 != 0)
 141                 {
 142                         if (length < 0)
 143                         {
 144                                 LERROR("Socket error: %d\n", errno);
 145                                 break;
 146                         }
 147                         if (length > 0)
 148                         {
 149                                 LDEBUG("Got broadcast response.\n");
 150
 151
 152                                 // Get address
 153                                 char addrstr[16];
 154                                 enet_address_get_host_ip(&remoteaddr, addrstr, 16);
 155                                 Address addr(addrstr);
 156                                 // FIXME: We need the proper port here!
 157                                 addr.setPort(0);
 158
 159
 160                                 // Look if server is already known
 161                                 bool newaddr = true;
 162                                 for (unsigned int i = 0; i < serveraddr.size(); i++)
 163                                 {
 164                                         if (serveraddr[i] == addr)
 165                                         {
 166                                                 newaddr = false;
 167                                                 if (serverinfo[i] != (char*)buffer.data)
 168                                                 {
 169                                                         listchanged = true;
 170                                                         serverinfo[i] = (char*)buffer.data;
 171                                                 }
 172                                                 break;
 173                                         }
 174                                 }
 175
 176
 177                                 // Add server to list
 178                                 if (newaddr)
 179                                 {
 180                                         serveraddr.push_back(addr);
 181                                         serverinfo.push_back((char*)buffer.data);
 182                                         listchanged = true;
 183                                 }
 184
 185                         }
 186                 }
 187                 // Call calback function
 188                 /*if (listchanged && cbscript && (cbfunc != ""))
 189                 {
 190                         cbscript->callFunction(cbfunc);
 191                 }*/
 192
 193                 free(buffer.data);
 194         }
 195
 196         void BroadcastClient::doAllWork(float msecs)
 197         {
 198                 for (unsigned int i = 0; i < bcclients.size(); i++)
 199                 {
 200                         bcclients[i]->doWork(msecs);
 201                 }
 202         }
 203
 204         std::vector<BroadcastClient*> BroadcastClient::bcclients;
 205 }
 206