arch/linux/linuxnet.c

   1 /* $Id: linuxnet.c,v 1.13 2003-11-18 01:08:07 btb Exp $ */
   2 /*
   3 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
   4 SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
   5 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
   6 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
   7 IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
   8 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
   9 FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
  10 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
  11 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
  12 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  13 */
  14
  15 /*
  16  *
  17  * Linux lower-level network code.
  18  * implements functions declared in include/ipx.h
  19  *
  20  */
  21
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <conf.h>
  25 #endif
  26
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/time.h>
  33 #include <netinet/in.h> /* for htons & co. */
  34
  35 #include "pstypes.h"
  36 #include "args.h"
  37 #include "error.h"
  38
  39 #include "ipx.h"
  40 #include "ipx_drv.h"
  41 #ifdef NATIVE_IPX
  42 # include "ipx_bsd.h"
  43 #endif //NATIVE_IPX
  44 #ifdef KALINIX
  45 #include "ipx_kali.h"
  46 #endif
  47 #include "ipx_udp.h"
  48 #include "ipx_mcast4.h"
  49 #include "error.h"
  50 #include "../../main/player.h"  /* for Players */
  51 #include "../../main/multi.h"   /* for NetPlayers */
  52 //added 05/17/99 Matt Mueller - needed to redefine FD_* so that no asm is used
  53 //#include "checker.h"
  54 //end addition -MM
  55 #include "byteswap.h"
  56
  57 #define MAX_IPX_DATA 576
  58
  59 int ipx_fd;
  60 ipx_socket_t ipx_socket_data;
  61 ubyte ipx_installed=0;
  62 ushort ipx_socket = 0;
  63 uint ipx_network = 0;
  64 ubyte ipx_MyAddress[10];
  65 int ipx_packetnum = 0;                  /* Sequence number */
  66 //int     ipx_packettotal=0,ipx_lastspeed=0;
  67
  68 /* User defined routing stuff */
  69 typedef struct user_address {
  70         ubyte network[4];
  71         ubyte node[6];
  72         ubyte address[6];
  73 } user_address;
  74 #define MAX_USERS 64
  75 int Ipx_num_users = 0;
  76 user_address Ipx_users[MAX_USERS];
  77
  78 #define MAX_NETWORKS 64
  79 int Ipx_num_networks = 0;
  80 uint Ipx_networks[MAX_NETWORKS];
  81
  82 int ipx_general_PacketReady(ipx_socket_t *s) {
  83         fd_set set;
  84         struct timeval tv;
  85
  86         FD_ZERO(&set);
  87         FD_SET(s->fd, &set);
  88         tv.tv_sec = tv.tv_usec = 0;
  89         if (select(s->fd + 1, &set, NULL, NULL, &tv) > 0)
  90                 return 1;
  91         else
  92                 return 0;
  93 }
  94
  95 struct ipx_driver *driver = &ipx_udp;
  96
  97 ubyte * ipx_get_my_server_address()
  98 {
  99         return (ubyte *)&ipx_network;
 100 }
 101
 102 ubyte * ipx_get_my_local_address()
 103 {
 104         return (ubyte *)(ipx_MyAddress + 4);
 105 }
 106
 107 void arch_ipx_set_driver(int ipx_driver)
 108 {
 109         switch(ipx_driver) {
 110 #ifdef NATIVE_IPX
 111         case IPX_DRIVER_IPX: driver = &ipx_bsd; break;
 112 #endif //NATIVE_IPX
 113 #ifdef KALINIX
 114         case IPX_DRIVER_KALI: driver = &ipx_kali; break;
 115 #endif
 116         case IPX_DRIVER_UDP: driver = &ipx_udp; break;
 117         case IPX_DRIVER_MCAST4: driver = &ipx_mcast4; break;
 118         default: Int3();
 119         }
 120 }
 121
 122 int ipx_init(int socket_number)
 123 {
 124         int i;
 125
 126         if ((i = FindArg("-ipxnetwork")) && Args[i + 1]) {
 127                 unsigned long n = strtol(Args[i + 1], NULL, 16);
 128                 ipx_MyAddress[0] = n >> 24; ipx_MyAddress[1] = (n >> 16) & 255;
 129                 ipx_MyAddress[2] = (n >> 8) & 255; ipx_MyAddress[3] = n & 255;
 130                 printf("IPX: Using network %08x\n", (unsigned int)n);
 131         }
 132         if (driver->OpenSocket(&ipx_socket_data, socket_number)) {
 133                 return IPX_NOT_INSTALLED;
 134         }
 135         driver->GetMyAddress();
 136         memcpy(&ipx_network, ipx_MyAddress, 4);
 137         Ipx_num_networks = 0;
 138         memcpy( &Ipx_networks[Ipx_num_networks++], &ipx_network, 4 );
 139         ipx_installed = 1;
 140         atexit(ipx_close);
 141         return IPX_INIT_OK;
 142 }
 143
 144 void ipx_close()
 145 {
 146         if (ipx_installed)
 147                 driver->CloseSocket(&ipx_socket_data);
 148         ipx_installed = 0;
 149 }
 150
 151 int ipx_get_packet_data( ubyte * data )
 152 {
 153         struct ipx_recv_data rd;
 154         char buf[MAX_IPX_DATA];
 155 //killed 6-15-99 to get rid of compile warnings - OE
 156 //      uint best_id = 0;
 157 //      uint pkt_num;
 158 //end kill - OE
 159         int size;
 160         int best_size = 0;
 161 //edited 04/12/99 Matt Mueller - duh, we don't want to throw all that data away!
 162         //--killed-- Like the original, only take latest packet, throw away rest
 163         //do _NOT_ throw them away!
 164         while (driver->PacketReady(&ipx_socket_data)) {
 165                 if ((size =
 166                      driver->ReceivePacket(&ipx_socket_data, buf,
 167                       sizeof(buf), &rd)) > 4) {
 168                      if (!memcmp(rd.src_network, ipx_MyAddress, 10))
 169                         continue;       /* don't get own pkts */
 170 //--killed--                 pkt_num = INTEL_INT(*(uint *)buf);
 171 //--killed--                 if (pkt_num >= best_id) {
 172                         memcpy(data, buf + 4, size - 4);
 173                                 return size-4;
 174 //--killed--                    best_id = pkt_num;
 175 //--killed--                    best_size = size - 4;
 176 //--killed--                 }
 177 //end edit -MM
 178                 }
 179         }
 180         return best_size;
 181 }
 182
 183 void ipx_send_packet_data( ubyte * data, int datasize, ubyte *network, ubyte *address, ubyte *immediate_address )
 184 {
 185         u_char buf[MAX_IPX_DATA];
 186         IPXPacket_t ipx_header;
 187
 188         Assert(datasize <= MAX_IPX_DATA+4);
 189
 190         memcpy(ipx_header.Destination.Network, network, 4);
 191         memcpy(ipx_header.Destination.Node, immediate_address, 6);
 192         *(u_short *)ipx_header.Destination.Socket = htons(ipx_socket_data.socket);
 193         ipx_header.PacketType = 4; /* Packet Exchange */
 194         *(uint *)buf = INTEL_INT(ipx_packetnum);
 195         ipx_packetnum++;
 196     //ipx_packettotal+=datasize+4;
 197     //if (f2i(Players[Player_num].time_level) && (f2i(Players[Player_num].time_level)%10!=ipx_lastspeed))
 198         //{
 199         //   ipx_lastspeed=f2i(Players[Player_num].time_level)%10;
 200         //   printf("tot=%i,t2=%i,time=%i,avg=%i,a2=%i\n",ipx_packetnum,ipx_packettotal,(int)f2i(Players[Player_num].time_level),
 201         //          ipx_packetnum/(int)f2i(Players[Player_num].time_level),
 202         //          ipx_packettotal/(int)f2i(Players[Player_num].time_level));
 203         //}
 204         memcpy(buf + 4, data, datasize);
 205         driver->SendPacket(&ipx_socket_data, &ipx_header, buf, datasize + 4);
 206 }
 207
 208 void ipx_get_local_target( ubyte * server, ubyte * node, ubyte * local_target )
 209 {
 210         // let's hope Linux knows how to route it
 211         memcpy( local_target, node, 6 );
 212 }
 213
 214 void ipx_send_broadcast_packet_data( ubyte * data, int datasize )
 215 {
 216         int i, j;
 217         ubyte broadcast[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 218         ubyte local_address[6];
 219
 220         // Set to all networks besides mine
 221         for (i=0; i<Ipx_num_networks; i++ )     {
 222                 if ( memcmp( &Ipx_networks[i], &ipx_network, 4 ) )      {
 223                         ipx_get_local_target( (ubyte *)&Ipx_networks[i], broadcast, local_address );
 224                         ipx_send_packet_data( data, datasize, (ubyte *)&Ipx_networks[i], broadcast, local_address );
 225                 } else {
 226                         ipx_send_packet_data( data, datasize, (ubyte *)&Ipx_networks[i], broadcast, broadcast );
 227                 }
 228         }
 229
 230         //OLDipx_send_packet_data( data, datasize, (ubyte *)&ipx_network, broadcast, broadcast );
 231
 232         // Send directly to all users not on my network or in the network list.
 233         for (i=0; i<Ipx_num_users; i++ )        {
 234                 if ( memcmp( Ipx_users[i].network, &ipx_network, 4 ) )  {
 235                         for (j=0; j<Ipx_num_networks; j++ )             {
 236                                 if (!memcmp( Ipx_users[i].network, &Ipx_networks[j], 4 ))
 237                                         goto SkipUser;
 238                         }
 239                         ipx_send_packet_data( data, datasize, Ipx_users[i].network, Ipx_users[i].node, Ipx_users[i].address );
 240 SkipUser:
 241                         j = 0;
 242                 }
 243         }
 244 }
 245
 246 // Sends a non-localized packet... needs 4 byte server, 6 byte address
 247 void ipx_send_internetwork_packet_data( ubyte * data, int datasize, ubyte * server, ubyte *address )
 248 {
 249         ubyte local_address[6];
 250
 251 #ifdef WORDS_NEED_ALIGNMENT
 252         int zero = 0;
 253         if (memcmp(server, &zero, 4)) {
 254 #else // WORDS_NEED_ALIGNMENT
 255         if ((*(uint *)server) != 0) {
 256 #endif // WORDS_NEED_ALIGNMENT
 257                 ipx_get_local_target( server, address, local_address );
 258                 ipx_send_packet_data( data, datasize, server, address, local_address );
 259         } else {
 260                 // Old method, no server info.
 261                 ipx_send_packet_data( data, datasize, server, address, address );
 262         }
 263 }
 264
 265 int ipx_change_default_socket( ushort socket_number )
 266 {
 267         if ( !ipx_installed ) return -3;
 268
 269         driver->CloseSocket(&ipx_socket_data);
 270         if (driver->OpenSocket(&ipx_socket_data, socket_number)) {
 271                 return -3;
 272         }
 273         return 0;
 274 }
 275
 276 void ipx_read_user_file(char * filename)
 277 {
 278         FILE * fp;
 279         user_address tmp;
 280         char temp_line[132], *p1;
 281         int n, ln=0, x;
 282
 283         if (!filename) return;
 284
 285         Ipx_num_users = 0;
 286
 287         fp = fopen( filename, "rt" );
 288         if ( !fp ) return;
 289
 290         printf( "Broadcast Users:\n" );
 291
 292         while (fgets(temp_line, 132, fp)) {
 293                 ln++;
 294                 p1 = strchr(temp_line,'\n'); if (p1) *p1 = '\0';
 295                 p1 = strchr(temp_line,';'); if (p1) *p1 = '\0';
 296 #if 1 // adb: replaced sscanf(..., "%2x...", (char *)...) with better, but longer code
 297                 if (strlen(temp_line) >= 21 && temp_line[8] == '/') {
 298                         for (n = 0; n < 4; n++) {
 299                                 if (sscanf(temp_line + n * 2, "%2x", &x) != 1)
 300                                         break;
 301                                 tmp.network[n] = x;
 302                         }
 303                         if (n != 4)
 304                                 continue;
 305                         for (n = 0; n < 6; n++) {
 306                                 if (sscanf(temp_line + 9 + n * 2, "%2x", &x) != 1)
 307                                         break;
 308                                 tmp.node[n] = x;
 309                         }
 310                         if (n != 6)
 311                                 continue;
 312                 } else
 313                         continue;
 314 #else
 315                 n = sscanf( temp_line, "%2x%2x%2x%2x/%2x%2x%2x%2x%2x%2x", &tmp.network[0], &tmp.network[1], &tmp.network[2], &tmp.network[3], &tmp.node[0], &tmp.node[1], &tmp.node[2],&tmp.node[3], &tmp.node[4], &tmp.node[5] );
 316                 if ( n != 10 ) continue;
 317 #endif
 318                 if ( Ipx_num_users < MAX_USERS )        {
 319                         ubyte * ipx_real_buffer = (ubyte *)&tmp;
 320                         ipx_get_local_target( tmp.network, tmp.node, tmp.address );
 321                         Ipx_users[Ipx_num_users++] = tmp;
 322                         printf( "%02X%02X%02X%02X/", ipx_real_buffer[0],ipx_real_buffer[1],ipx_real_buffer[2],ipx_real_buffer[3] );
 323                         printf( "%02X%02X%02X%02X%02X%02X\n", ipx_real_buffer[4],ipx_real_buffer[5],ipx_real_buffer[6],ipx_real_buffer[7],ipx_real_buffer[8],ipx_real_buffer[9] );
 324                 } else {
 325                         printf( "Too many addresses in %s! (Limit of %d)\n", filename, MAX_USERS );
 326                         fclose(fp);
 327                         return;
 328                 }
 329         }
 330         fclose(fp);
 331 }
 332
 333
 334 void ipx_read_network_file(char * filename)
 335 {
 336         FILE * fp;
 337         user_address tmp;
 338         char temp_line[132], *p1;
 339         int i, n, ln=0, x;
 340
 341         if (!filename) return;
 342
 343         fp = fopen( filename, "rt" );
 344         if ( !fp ) return;
 345
 346         printf( "Using Networks:\n" );
 347         for (i=0; i<Ipx_num_networks; i++ )             {
 348                 ubyte * n1 = (ubyte *)&Ipx_networks[i];
 349                 printf("* %02x%02x%02x%02x\n", n1[0], n1[1], n1[2], n1[3] );
 350         }
 351
 352         while (fgets(temp_line, 132, fp)) {
 353                 ln++;
 354                 p1 = strchr(temp_line,'\n'); if (p1) *p1 = '\0';
 355                 p1 = strchr(temp_line,';'); if (p1) *p1 = '\0';
 356 #if 1 // adb: replaced sscanf(..., "%2x...", (char *)...) with better, but longer code
 357                 if (strlen(temp_line) >= 8) {
 358                         for (n = 0; n < 4; n++) {
 359                                 if (sscanf(temp_line + n * 2, "%2x", &x) != 1)
 360                                         break;
 361                                 tmp.network[n] = x;
 362                         }
 363                         if (n != 4)
 364                                 continue;
 365                 } else
 366                         continue;
 367 #else
 368                 n = sscanf( temp_line, "%2x%2x%2x%2x", &tmp.network[0], &tmp.network[1], &tmp.network[2], &tmp.network[3] );
 369                 if ( n != 4 ) continue;
 370 #endif
 371                 if ( Ipx_num_networks < MAX_NETWORKS  ) {
 372                         int j;
 373                         for (j=0; j<Ipx_num_networks; j++ )
 374                                 if ( !memcmp( &Ipx_networks[j], tmp.network, 4 ) )
 375                                         break;
 376                         if ( j >= Ipx_num_networks )    {
 377                                 memcpy( &Ipx_networks[Ipx_num_networks++], tmp.network, 4 );
 378                                 printf("  %02x%02x%02x%02x\n", tmp.network[0], tmp.network[1], tmp.network[2], tmp.network[3] );
 379                         }
 380                 } else {
 381                         printf( "Too many networks in %s! (Limit of %d)\n", filename, MAX_NETWORKS );
 382                         fclose(fp);
 383                         return;
 384                 }
 385         }
 386         fclose(fp);
 387 }
 388
 389 // Initalizes the protocol-specific member of the netgame packet.
 390 void ipx_init_netgame_aux_data(ubyte buf[])
 391 {
 392         if(driver->InitNetgameAuxData)
 393                 driver->InitNetgameAuxData(&ipx_socket_data, buf);
 394 }
 395
 396 // Handles the protocol-specific member of the netgame packet.
 397 int ipx_handle_netgame_aux_data(const ubyte buf[])
 398 {
 399         if(driver->HandleNetgameAuxData)
 400                 return driver->HandleNetgameAuxData(&ipx_socket_data, buf);
 401         return 0;
 402 }
 403
 404 // Notifies the protocol that we're done with a particular game
 405 void ipx_handle_leave_game()
 406 {
 407         if(driver->HandleLeaveGame)
 408                 driver->HandleLeaveGame(&ipx_socket_data);
 409 }
 410
 411 // Send a packet to every member of the game.
 412 int ipx_send_game_packet(ubyte *data, int datasize)
 413 {
 414         if(driver->SendGamePacket) {
 415                 u_char buf[MAX_IPX_DATA];
 416
 417                 *(uint *)buf = ipx_packetnum++;
 418                 memcpy(buf + 4, data, datasize);
 419                 *(uint *)data = ipx_packetnum++;
 420                 return driver->SendGamePacket(&ipx_socket_data, buf, datasize + 4);
 421         } else {
 422                 // Loop through all the players unicasting the packet.
 423                 int i;
 424
 425                 //printf("Sending game packet: N_players = %i\n", N_players);
 426
 427                 for(i=0; i<N_players; i++) {
 428                         if(Players[i].connected && (i != Player_num))
 429                                 ipx_send_packet_data(data, datasize, NetPlayers.players[i].network.ipx.server, NetPlayers.players[i].network.ipx.node,Players[i].net_address);
 430                 }
 431                 return datasize;
 432         }
 433
 434         return 0;
 435 }