arch/linux/linuxnet.c

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