arch/linux/linuxnet.c

   1 /* $Id: linuxnet.c,v 1.12 2003-10-12 09:17:47 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 #include "ipx_kali.h"
  45 #include "ipx_udp.h"
  46 #include "ipx_mcast4.h"
  47 #include "error.h"
  48 #include "../../main/player.h"  /* for Players */
  49 #include "../../main/multi.h"   /* for NetPlayers */
  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         case IPX_DRIVER_KALI: driver = &ipx_kali; break;
 112         case IPX_DRIVER_UDP: driver = &ipx_udp; break;
 113         case IPX_DRIVER_MCAST4: driver = &ipx_mcast4; break;
 114         default: Int3();
 115         }
 116 }
 117
 118 int ipx_init(int socket_number)
 119 {
 120         int i;
 121
 122         if ((i = FindArg("-ipxnetwork")) && Args[i + 1]) {
 123                 unsigned long n = strtol(Args[i + 1], NULL, 16);
 124                 ipx_MyAddress[0] = n >> 24; ipx_MyAddress[1] = (n >> 16) & 255;
 125                 ipx_MyAddress[2] = (n >> 8) & 255; ipx_MyAddress[3] = n & 255;
 126                 printf("IPX: Using network %08x\n", (unsigned int)n);
 127         }
 128         if (driver->OpenSocket(&ipx_socket_data, socket_number)) {
 129                 return IPX_NOT_INSTALLED;
 130         }
 131         driver->GetMyAddress();
 132         memcpy(&ipx_network, ipx_MyAddress, 4);
 133         Ipx_num_networks = 0;
 134         memcpy( &Ipx_networks[Ipx_num_networks++], &ipx_network, 4 );
 135         ipx_installed = 1;
 136         atexit(ipx_close);
 137         return IPX_INIT_OK;
 138 }
 139
 140 void ipx_close()
 141 {
 142         if (ipx_installed)
 143                 driver->CloseSocket(&ipx_socket_data);
 144         ipx_installed = 0;
 145 }
 146
 147 int ipx_get_packet_data( ubyte * data )
 148 {
 149         struct ipx_recv_data rd;
 150         char buf[MAX_IPX_DATA];
 151 //killed 6-15-99 to get rid of compile warnings - OE
 152 //      uint best_id = 0;
 153 //      uint pkt_num;
 154 //end kill - OE
 155         int size;
 156         int best_size = 0;
 157 //edited 04/12/99 Matt Mueller - duh, we don't want to throw all that data away!
 158         //--killed-- Like the original, only take latest packet, throw away rest
 159         //do _NOT_ throw them away!
 160         while (driver->PacketReady(&ipx_socket_data)) {
 161                 if ((size =
 162                      driver->ReceivePacket(&ipx_socket_data, buf,
 163                       sizeof(buf), &rd)) > 4) {
 164                      if (!memcmp(rd.src_network, ipx_MyAddress, 10))
 165                         continue;       /* don't get own pkts */
 166 //--killed--                 pkt_num = INTEL_INT(*(uint *)buf);
 167 //--killed--                 if (pkt_num >= best_id) {
 168                         memcpy(data, buf + 4, size - 4);
 169                                 return size-4;
 170 //--killed--                    best_id = pkt_num;
 171 //--killed--                    best_size = size - 4;
 172 //--killed--                 }
 173 //end edit -MM
 174                 }
 175         }
 176         return best_size;
 177 }
 178
 179 void ipx_send_packet_data( ubyte * data, int datasize, ubyte *network, ubyte *address, ubyte *immediate_address )
 180 {
 181         u_char buf[MAX_IPX_DATA];
 182         IPXPacket_t ipx_header;
 183
 184         Assert(datasize <= MAX_IPX_DATA+4);
 185
 186         memcpy(ipx_header.Destination.Network, network, 4);
 187         memcpy(ipx_header.Destination.Node, immediate_address, 6);
 188         *(u_short *)ipx_header.Destination.Socket = htons(ipx_socket_data.socket);
 189         ipx_header.PacketType = 4; /* Packet Exchange */
 190         *(uint *)buf = INTEL_INT(ipx_packetnum);
 191         ipx_packetnum++;
 192     //ipx_packettotal+=datasize+4;
 193     //if (f2i(Players[Player_num].time_level) && (f2i(Players[Player_num].time_level)%10!=ipx_lastspeed))
 194         //{
 195         //   ipx_lastspeed=f2i(Players[Player_num].time_level)%10;
 196         //   printf("tot=%i,t2=%i,time=%i,avg=%i,a2=%i\n",ipx_packetnum,ipx_packettotal,(int)f2i(Players[Player_num].time_level),
 197         //          ipx_packetnum/(int)f2i(Players[Player_num].time_level),
 198         //          ipx_packettotal/(int)f2i(Players[Player_num].time_level));
 199         //}
 200         memcpy(buf + 4, data, datasize);
 201         driver->SendPacket(&ipx_socket_data, &ipx_header, buf, datasize + 4);
 202 }
 203
 204 void ipx_get_local_target( ubyte * server, ubyte * node, ubyte * local_target )
 205 {
 206         // let's hope Linux knows how to route it
 207         memcpy( local_target, node, 6 );
 208 }
 209
 210 void ipx_send_broadcast_packet_data( ubyte * data, int datasize )
 211 {
 212         int i, j;
 213         ubyte broadcast[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 214         ubyte local_address[6];
 215
 216         // Set to all networks besides mine
 217         for (i=0; i<Ipx_num_networks; i++ )     {
 218                 if ( memcmp( &Ipx_networks[i], &ipx_network, 4 ) )      {
 219                         ipx_get_local_target( (ubyte *)&Ipx_networks[i], broadcast, local_address );
 220                         ipx_send_packet_data( data, datasize, (ubyte *)&Ipx_networks[i], broadcast, local_address );
 221                 } else {
 222                         ipx_send_packet_data( data, datasize, (ubyte *)&Ipx_networks[i], broadcast, broadcast );
 223                 }
 224         }
 225
 226         //OLDipx_send_packet_data( data, datasize, (ubyte *)&ipx_network, broadcast, broadcast );
 227
 228         // Send directly to all users not on my network or in the network list.
 229         for (i=0; i<Ipx_num_users; i++ )        {
 230                 if ( memcmp( Ipx_users[i].network, &ipx_network, 4 ) )  {
 231                         for (j=0; j<Ipx_num_networks; j++ )             {
 232                                 if (!memcmp( Ipx_users[i].network, &Ipx_networks[j], 4 ))
 233                                         goto SkipUser;
 234                         }
 235                         ipx_send_packet_data( data, datasize, Ipx_users[i].network, Ipx_users[i].node, Ipx_users[i].address );
 236 SkipUser:
 237                         j = 0;
 238                 }
 239         }
 240 }
 241
 242 // Sends a non-localized packet... needs 4 byte server, 6 byte address
 243 void ipx_send_internetwork_packet_data( ubyte * data, int datasize, ubyte * server, ubyte *address )
 244 {
 245         ubyte local_address[6];
 246
 247 #ifdef WORDS_NEED_ALIGNMENT
 248         int zero = 0;
 249         if (memcmp(server, &zero, 4)) {
 250 #else // WORDS_NEED_ALIGNMENT
 251         if ((*(uint *)server) != 0) {
 252 #endif // WORDS_NEED_ALIGNMENT
 253                 ipx_get_local_target( server, address, local_address );
 254                 ipx_send_packet_data( data, datasize, server, address, local_address );
 255         } else {
 256                 // Old method, no server info.
 257                 ipx_send_packet_data( data, datasize, server, address, address );
 258         }
 259 }
 260
 261 int ipx_change_default_socket( ushort socket_number )
 262 {
 263         if ( !ipx_installed ) return -3;
 264
 265         driver->CloseSocket(&ipx_socket_data);
 266         if (driver->OpenSocket(&ipx_socket_data, socket_number)) {
 267                 return -3;
 268         }
 269         return 0;
 270 }
 271
 272 void ipx_read_user_file(char * filename)
 273 {
 274         FILE * fp;
 275         user_address tmp;
 276         char temp_line[132], *p1;
 277         int n, ln=0, x;
 278
 279         if (!filename) return;
 280
 281         Ipx_num_users = 0;
 282
 283         fp = fopen( filename, "rt" );
 284         if ( !fp ) return;
 285
 286         printf( "Broadcast Users:\n" );
 287
 288         while (fgets(temp_line, 132, fp)) {
 289                 ln++;
 290                 p1 = strchr(temp_line,'\n'); if (p1) *p1 = '\0';
 291                 p1 = strchr(temp_line,';'); if (p1) *p1 = '\0';
 292 #if 1 // adb: replaced sscanf(..., "%2x...", (char *)...) with better, but longer code
 293                 if (strlen(temp_line) >= 21 && temp_line[8] == '/') {
 294                         for (n = 0; n < 4; n++) {
 295                                 if (sscanf(temp_line + n * 2, "%2x", &x) != 1)
 296                                         break;
 297                                 tmp.network[n] = x;
 298                         }
 299                         if (n != 4)
 300                                 continue;
 301                         for (n = 0; n < 6; n++) {
 302                                 if (sscanf(temp_line + 9 + n * 2, "%2x", &x) != 1)
 303                                         break;
 304                                 tmp.node[n] = x;
 305                         }
 306                         if (n != 6)
 307                                 continue;
 308                 } else
 309                         continue;
 310 #else
 311                 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] );
 312                 if ( n != 10 ) continue;
 313 #endif
 314                 if ( Ipx_num_users < MAX_USERS )        {
 315                         ubyte * ipx_real_buffer = (ubyte *)&tmp;
 316                         ipx_get_local_target( tmp.network, tmp.node, tmp.address );
 317                         Ipx_users[Ipx_num_users++] = tmp;
 318                         printf( "%02X%02X%02X%02X/", ipx_real_buffer[0],ipx_real_buffer[1],ipx_real_buffer[2],ipx_real_buffer[3] );
 319                         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] );
 320                 } else {
 321                         printf( "Too many addresses in %s! (Limit of %d)\n", filename, MAX_USERS );
 322                         fclose(fp);
 323                         return;
 324                 }
 325         }
 326         fclose(fp);
 327 }
 328
 329
 330 void ipx_read_network_file(char * filename)
 331 {
 332         FILE * fp;
 333         user_address tmp;
 334         char temp_line[132], *p1;
 335         int i, n, ln=0, x;
 336
 337         if (!filename) return;
 338
 339         fp = fopen( filename, "rt" );
 340         if ( !fp ) return;
 341
 342         printf( "Using Networks:\n" );
 343         for (i=0; i<Ipx_num_networks; i++ )             {
 344                 ubyte * n1 = (ubyte *)&Ipx_networks[i];
 345                 printf("* %02x%02x%02x%02x\n", n1[0], n1[1], n1[2], n1[3] );
 346         }
 347
 348         while (fgets(temp_line, 132, fp)) {
 349                 ln++;
 350                 p1 = strchr(temp_line,'\n'); if (p1) *p1 = '\0';
 351                 p1 = strchr(temp_line,';'); if (p1) *p1 = '\0';
 352 #if 1 // adb: replaced sscanf(..., "%2x...", (char *)...) with better, but longer code
 353                 if (strlen(temp_line) >= 8) {
 354                         for (n = 0; n < 4; n++) {
 355                                 if (sscanf(temp_line + n * 2, "%2x", &x) != 1)
 356                                         break;
 357                                 tmp.network[n] = x;
 358                         }
 359                         if (n != 4)
 360                                 continue;
 361                 } else
 362                         continue;
 363 #else
 364                 n = sscanf( temp_line, "%2x%2x%2x%2x", &tmp.network[0], &tmp.network[1], &tmp.network[2], &tmp.network[3] );
 365                 if ( n != 4 ) continue;
 366 #endif
 367                 if ( Ipx_num_networks < MAX_NETWORKS  ) {
 368                         int j;
 369                         for (j=0; j<Ipx_num_networks; j++ )
 370                                 if ( !memcmp( &Ipx_networks[j], tmp.network, 4 ) )
 371                                         break;
 372                         if ( j >= Ipx_num_networks )    {
 373                                 memcpy( &Ipx_networks[Ipx_num_networks++], tmp.network, 4 );
 374                                 printf("  %02x%02x%02x%02x\n", tmp.network[0], tmp.network[1], tmp.network[2], tmp.network[3] );
 375                         }
 376                 } else {
 377                         printf( "Too many networks in %s! (Limit of %d)\n", filename, MAX_NETWORKS );
 378                         fclose(fp);
 379                         return;
 380                 }
 381         }
 382         fclose(fp);
 383 }
 384
 385 // Initalizes the protocol-specific member of the netgame packet.
 386 void ipx_init_netgame_aux_data(ubyte buf[])
 387 {
 388         if(driver->InitNetgameAuxData)
 389                 driver->InitNetgameAuxData(&ipx_socket_data, buf);
 390 }
 391
 392 // Handles the protocol-specific member of the netgame packet.
 393 int ipx_handle_netgame_aux_data(const ubyte buf[])
 394 {
 395         if(driver->HandleNetgameAuxData)
 396                 return driver->HandleNetgameAuxData(&ipx_socket_data, buf);
 397         return 0;
 398 }
 399
 400 // Notifies the protocol that we're done with a particular game
 401 void ipx_handle_leave_game()
 402 {
 403         if(driver->HandleLeaveGame)
 404                 driver->HandleLeaveGame(&ipx_socket_data);
 405 }
 406
 407 // Send a packet to every member of the game.
 408 int ipx_send_game_packet(ubyte *data, int datasize)
 409 {
 410         if(driver->SendGamePacket) {
 411                 u_char buf[MAX_IPX_DATA];
 412
 413                 *(uint *)buf = ipx_packetnum++;
 414                 memcpy(buf + 4, data, datasize);
 415                 *(uint *)data = ipx_packetnum++;
 416                 return driver->SendGamePacket(&ipx_socket_data, buf, datasize + 4);
 417         } else {
 418                 // Loop through all the players unicasting the packet.
 419                 int i;
 420
 421                 //printf("Sending game packet: N_players = %i\n", N_players);
 422
 423                 for(i=0; i<N_players; i++) {
 424                         if(Players[i].connected && (i != Player_num))
 425                                 ipx_send_packet_data(data, datasize, NetPlayers.players[i].network.ipx.server, NetPlayers.players[i].network.ipx.node,Players[i].net_address);
 426                 }
 427                 return datasize;
 428         }
 429
 430         return 0;
 431 }