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source: orxonox.OLD/branches/terrain/src/lib/network/udp_server_socket.cc @ 10721

Last change on this file since 10721 was 9869, checked in by bensch, 18 years ago

orxonox/trunk: merged the new_class_id branche back to the trunk.
merged with command:
svn merge https://svn.orxonox.net/orxonox/branches/new_class_id trunk -r9683:HEAD
no conflicts… puh..

File size: 6.5 KB
Line 
1/*
2   orxonox - the future of 3D-vertical-scrollers
3
4   Copyright (C) 2004 orx
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2, or (at your option)
9   any later version.
10
11### File Specific:
12   main-programmer: Christoph Renner
13   co-programmer:
14*/
15
16#include "udp_server_socket.h"
17#include "debug.h"
18
19
20ObjectListDefinition(UdpServerSocket);
21/**
22 * constructor
23 * @param port port to listen on
24 */
25UdpServerSocket::UdpServerSocket( int port ) : ServerSocket( port )
26{
27  packet = SDLNet_AllocPacket( UDP_PACKET_SIZE );
28
29  if ( !packet )
30  {
31    PRINTF(1)("SDLNet_AllocPacket: %s\n", SDLNet_GetError());
32
33    assert( false );
34    bOk = false;
35  }
36
37  memset( packet->data, 0, UDP_PACKET_SIZE );
38
39  listen( port );
40}
41
42/**
43 * default destructor
44 */
45UdpServerSocket::~UdpServerSocket( )
46{
47  for ( int i = 0; i < (int)packetBuffer.size(); i++ )
48    removeUserPackets( i );
49
50  if ( packet )
51    SDLNet_FreePacket( packet );
52
53  if ( socket )
54    SDLNet_UDP_Close( socket );
55}
56
57/**
58 * tell udpServerSocket to recieve packets on port
59 * @param port port
60 * @return true on success
61 */
62bool UdpServerSocket::listen( unsigned int port )
63{
64  socket = SDLNet_UDP_Open( port );
65
66  PRINTF(0)("listening on port: %d\n", port);
67
68  if ( !socket )
69  {
70
71    bOk = false;
72    return false;
73  }
74
75  return true;
76}
77
78/**
79 * get newly connected socket. note
80 * @return new socket or NULL if no new socket exists
81 */
82NetworkSocket * UdpServerSocket::getNewSocket( void )
83{
84  NetworkSocket * result = NULL;
85
86  if ( newSocketList.size() > 0 )
87  {
88    result = newSocketList.front();
89
90    newSocketList.pop_front();
91  }
92
93  return result;
94}
95
96
97/**
98 * stop listening on server
99 */
100void UdpServerSocket::close( )
101{
102
103  for ( int i = 0; i < (int)packetBuffer.size(); i++ )
104    removeUserPackets( i );
105
106  packetBuffer.clear();
107  userList.clear();
108
109  SDLNet_UDP_Close( socket );
110  socket = NULL;
111}
112
113/**
114 * clean up users buffer
115 * @param userId users userid
116 */
117void UdpServerSocket::removeUserPackets( int userId )
118{
119  if ( userId >= (int)packetBuffer.size() )
120    return;
121
122  for ( NetworkPacketList::iterator it = packetBuffer[userId].begin(); it!=packetBuffer[userId].end(); it++ )
123  {
124    if ( it->data )
125    {
126      free( it->data );
127      it->data = NULL;
128    }
129  }
130
131  packetBuffer[userId].clear();
132}
133
134/**
135 * get next packet for user
136 * @param userId user id
137 * @return recieved packet or packet with length 0 if no packet available
138 */
139NetworkPacket UdpServerSocket::getPacket( int userId )
140{
141  NetworkPacket res;
142  res.data = NULL;
143  res.length = 0;
144
145  if ( (int)packetBuffer.size() > userId && (int)packetBuffer[userId].size() > 0 )
146  {
147    res.data = packetBuffer[userId].front().data;
148    res.length = packetBuffer[userId].front().length;
149    packetBuffer[userId].pop_front();
150  }
151
152  return res;
153}
154
155/**
156 * get number of packets recieved for user
157 * @param userId user id
158 * @return number of packets in buffer
159 */
160int UdpServerSocket::getPacketCount( int userId )
161{
162  if ( userId >= (int)packetBuffer.size() )
163    return -1;
164
165  return packetBuffer[userId].size();
166}
167
168/**
169 * will set user state
170 * @param userId users id
171 * @param ip users host / port
172 */
173void UdpServerSocket::initUser( int userId, IPaddress ip, byte randomByte )
174{
175  int channel = SDLNet_UDP_Bind( socket, userId, &ip );
176  if( channel != userId )
177  {
178    PRINTF(1)("SDLNet_UDP_Bind: %s\n", SDLNet_GetError());
179    assert(false);
180    return;
181  }
182
183  if ( userId < (int)packetBuffer.size() )
184    removeUserPackets( userId );
185
186  if ( (int)packetBuffer.size() <= userId )
187    packetBuffer.resize( userId + 1 );
188
189  if ( (int)userList.size() <= userId )
190    userList.resize( userId + 1 );
191
192  userList[ userId ].addr = ip;
193  userList[ userId ].randomByte = randomByte;
194}
195
196/**
197 * remove user from list
198 * @param userId user id
199 */
200void UdpServerSocket::removeUser( int userId )
201{
202  removeUserPackets( userId );
203
204  if ( userId >= (int)userList.size() )
205    return;
206
207  userList[userId].addr.host = 0;
208  userList[userId].addr.port = 0;
209
210  SDLNet_UDP_Unbind( socket, userId );
211}
212
213/**
214 * send one packet to client associated to userId
215 * @param networkPacket packet to send
216 * @param userId users id
217 * @return true on success
218 */
219bool UdpServerSocket::sendPacket( NetworkPacket networkPacket , int userId )
220{
221  if ( !socket )
222    return false;
223
224  assert( networkPacket.length <= UDP_PACKET_SIZE );
225
226  memcpy( packet->data, networkPacket.data, networkPacket.length );
227  packet->len = networkPacket.length;
228  packet->channel = -1;
229
230  if ( SDLNet_UDP_Send( socket, userId, packet ) == 0 )
231  {
232    PRINTF(1)("SDLNet_UDP_Send: %s\n", SDLNet_GetError());
233    return false;
234  }
235
236  return true;
237}
238
239/**
240 * do periodically things
241 */
242void UdpServerSocket::update( )
243{
244  int res;
245  int newConn = 0;
246
247  // iterate through all newly received packets and assign them to the users packet buffer
248  for ( res = SDLNet_UDP_Recv( socket, packet ); res == 1; res = SDLNet_UDP_Recv( socket, packet ) )
249  {
250    int userId;
251    bool isNewConnection = false;
252
253    if ( packet->len <= 0 )
254      continue;
255
256    // search the user id this backet belongs to
257    for ( userId = 0; userId < (int)userList.size(); userId++ )
258    {
259      if ( userList[userId].addr.host == packet->address.host &&
260           userList[userId].addr.port == packet->address.port &&
261           userList[userId].randomByte == ( packet->data[0] & 0xFC ) )
262        break;
263    }
264
265    // is it a new packet initializing a new connecion?
266    if ( userId >= (int)userList.size() )
267    {
268      newConn++;
269      isNewConnection = true;
270
271      if ( newConn > MAX_NEW_CONNECTIONS )
272      {
273        PRINTF(2)("Too many new connections. Dropping packet\n");
274        continue;
275      }
276
277      for ( userId =0; userId < (int)userList.size(); userId++ )
278        if ( userList[userId].addr.host == 0 && userList[userId].addr.port == 0 )
279          break;
280
281      this->initUser( userId, packet->address, packet->data[0] & 0xFC );
282      UdpSocket * sock = new UdpSocket( this, packet->address, userId, packet->data[0] & 0xFC );
283      newSocketList.push_back( sock );
284      PRINTF(0)("NEW CONNECTION %x\n", packet->address.host );
285    }
286
287
288    // add new packet to packetbuffer
289    NetworkPacket networkPacket;
290    networkPacket.length = packet->len;
291    if ( packet->len != 0 )
292    {
293      networkPacket.data = (byte*)malloc( packet->len );
294      assert( networkPacket.data );
295    }
296    else
297    {
298      networkPacket.data = NULL;
299    }
300    memcpy( networkPacket.data, packet->data, packet->len );
301    packetBuffer[userId].push_back( networkPacket );
302  }
303
304  assert( res == 0 );
305}
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