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
  33 #ifdef _WIN32
  34 #include <winsock.h>
  35 #else
  36 #include <netinet/in.h> /* for htons & co. */
  37 #endif
  38
  39 #include "pstypes.h"
  40 #include "args.h"
  41 #include "error.h"
  42
  43 #include "ipx.h"
  44 #include "ipx_drv.h"
  45 #ifdef NATIVE_IPX
  46 # include "ipx_bsd.h"
  47 #endif //NATIVE_IPX
  48 #ifdef KALINIX
  49 #include "ipx_kali.h"
  50 #endif
  51 #include "ipx_udp.h"
  52 #include "ipx_mcast4.h"
  53 #include "error.h"
  54 #include "inferno.h"
  55 //added 05/17/99 Matt Mueller - needed to redefine FD_* so that no asm is used
  56 //#include "checker.h"
  57 //end addition -MM
  58 #include "byteswap.h"
  59
  60
  61 #ifdef _WIN32
  62 extern struct ipx_driver ipx_win;
  63 #endif
  64
  65 #define MAX_IPX_DATA 576
  66
  67 int ipx_fd;
  68 ipx_socket_t ipx_socket_data;
  69 ubyte ipx_installed=0;
  70 ushort ipx_socket = 0;
  71 uint ipx_network = 0;
  72 ubyte ipx_MyAddress[10];
  73 int ipx_packetnum = 0;                  /* Sequence number */
  74 //int     ipx_packettotal=0,ipx_lastspeed=0;
  75
  76 /* User defined routing stuff */
  77 typedef struct user_address {
  78         ubyte network[4];
  79         ubyte node[6];
  80         ubyte address[6];
  81 } user_address;
  82 #define MAX_USERS 64
  83 int Ipx_num_users = 0;
  84 user_address Ipx_users[MAX_USERS];
  85
  86 #define MAX_NETWORKS 64
  87 int Ipx_num_networks = 0;
  88 uint Ipx_networks[MAX_NETWORKS];
  89
  90 int ipx_general_PacketReady(ipx_socket_t *s) {
  91         fd_set set;
  92         struct timeval tv;
  93
  94         FD_ZERO(&set);
  95         FD_SET(s->fd, &set);
  96         tv.tv_sec = tv.tv_usec = 0;
  97         if (select(s->fd + 1, &set, NULL, NULL, &tv) > 0)
  98                 return 1;
  99         else
 100                 return 0;
 101 }
 102
 103 struct ipx_driver *driver = &ipx_udp;
 104
 105 ubyte * ipx_get_my_server_address()
 106 {
 107         return (ubyte *)&ipx_network;
 108 }
 109
 110 ubyte * ipx_get_my_local_address()
 111 {
 112         return (ubyte *)(ipx_MyAddress + 4);
 113 }
 114
 115 void arch_ipx_set_driver(int ipx_driver)
 116 {
 117         switch(ipx_driver) {
 118 #ifdef _WIN32
 119         case IPX_DRIVER_IPX: driver = &ipx_win; break;
 120 #else
 121 #ifdef NATIVE_IPX
 122         case IPX_DRIVER_IPX: driver = &ipx_bsd; break;
 123 #endif //NATIVE_IPX
 124 #endif
 125 #ifdef KALINIX
 126         case IPX_DRIVER_KALI: driver = &ipx_kali; break;
 127 #endif
 128         case IPX_DRIVER_UDP: driver = &ipx_udp; break;
 129         case IPX_DRIVER_MCAST4: driver = &ipx_mcast4; break;
 130         default: Int3();
 131         }
 132 }
 133
 134 int ipx_init(int socket_number)
 135 {
 136         int i;
 137 #ifdef _WIN32
 138         WORD wVersionRequested;
 139         WSADATA wsaData;
 140
 141         wVersionRequested = MAKEWORD(2, 0);
 142         if (WSAStartup( wVersionRequested, &wsaData))
 143         {
 144                 return IPX_SOCKET_ALREADY_OPEN;
 145         }
 146
 147 #if 0
 148         if ( LOBYTE( wsaData.wVersion ) != 2 ||
 149                 HIBYTE( wsaData.wVersion ) != 0 ) {
 150                 /* We couldn't find a usable WinSock DLL. */
 151                 WSACleanup( );
 152                 return IPX_SOCKET_TABLE_FULL;
 153         }
 154 #endif
 155 #endif
 156
 157         if ((i = FindArg("-ipxnetwork")) && Args[i + 1]) {
 158                 unsigned long n = strtol(Args[i + 1], NULL, 16);
 159                 ipx_MyAddress[0] = n >> 24; ipx_MyAddress[1] = (n >> 16) & 255;
 160                 ipx_MyAddress[2] = (n >> 8) & 255; ipx_MyAddress[3] = n & 255;
 161                 printf("IPX: Using network %08x\n", (unsigned int)n);
 162         }
 163         if (driver->OpenSocket(&ipx_socket_data, socket_number)) {
 164                 return IPX_NOT_INSTALLED;
 165         }
 166         driver->GetMyAddress();
 167         memcpy(&ipx_network, ipx_MyAddress, 4);
 168         Ipx_num_networks = 0;
 169         memcpy( &Ipx_networks[Ipx_num_networks++], &ipx_network, 4 );
 170         ipx_installed = 1;
 171         atexit(ipx_close);
 172         return IPX_INIT_OK;
 173 }
 174
 175 void ipx_close()
 176 {
 177         if (ipx_installed)
 178         {
 179 #ifdef _WIN32
 180                 WSACleanup();
 181 #endif
 182                 driver->CloseSocket(&ipx_socket_data);
 183         }
 184         ipx_installed = 0;
 185 }
 186
 187 int ipx_get_packet_data( ubyte * data )
 188 {
 189         struct ipx_recv_data rd;
 190         char buf[MAX_IPX_DATA];
 191 //killed 6-15-99 to get rid of compile warnings - OE
 192 //      uint best_id = 0;
 193 //      uint pkt_num;
 194 //end kill - OE
 195         int size;
 196         int best_size = 0;
 197 //edited 04/12/99 Matt Mueller - duh, we don't want to throw all that data away!
 198         //--killed-- Like the original, only take latest packet, throw away rest
 199         //do _NOT_ throw them away!
 200         while (driver->PacketReady(&ipx_socket_data)) {
 201                 if ((size =
 202                      driver->ReceivePacket(&ipx_socket_data, buf,
 203                       sizeof(buf), &rd)) > 4) {
 204                      if (!memcmp(rd.src_network, ipx_MyAddress, 10))
 205                         continue;       /* don't get own pkts */
 206 //--killed--                 pkt_num = INTEL_INT(*(uint *)buf);
 207 //--killed--                 if (pkt_num >= best_id) {
 208                         memcpy(data, buf + 4, size - 4);
 209                                 return size-4;
 210 //--killed--                    best_id = pkt_num;
 211 //--killed--                    best_size = size - 4;
 212 //--killed--                 }
 213 //end edit -MM
 214                 }
 215         }
 216         return best_size;
 217 }
 218
 219 void ipx_send_packet_data( ubyte * data, int datasize, ubyte *network, ubyte *address, ubyte *immediate_address )
 220 {
 221         u_char buf[MAX_IPX_DATA];
 222         IPXPacket_t ipx_header;
 223
 224         Assert(datasize <= MAX_IPX_DATA+4);
 225
 226         memcpy(ipx_header.Destination.Network, network, 4);
 227         memcpy(ipx_header.Destination.Node, immediate_address, 6);
 228         {
 229                 u_short socket = htons(ipx_socket_data.socket);
 230                 memcpy(ipx_header.Destination.Socket, &socket, 2);
 231         }
 232         ipx_header.PacketType = 4; /* Packet Exchange */
 233         {
 234                 int packetnum = INTEL_INT(ipx_packetnum);
 235                 memcpy(buf, &packetnum, 4);
 236         }
 237         ipx_packetnum++;
 238     //ipx_packettotal+=datasize+4;
 239     //if (f2i(Players[Player_num].time_level) && (f2i(Players[Player_num].time_level)%10!=ipx_lastspeed))
 240         //{
 241         //   ipx_lastspeed=f2i(Players[Player_num].time_level)%10;
 242         //   printf("tot=%i,t2=%i,time=%i,avg=%i,a2=%i\n",ipx_packetnum,ipx_packettotal,(int)f2i(Players[Player_num].time_level),
 243         //          ipx_packetnum/(int)f2i(Players[Player_num].time_level),
 244         //          ipx_packettotal/(int)f2i(Players[Player_num].time_level));
 245         //}
 246         memcpy(buf + 4, data, datasize);
 247         driver->SendPacket(&ipx_socket_data, &ipx_header, buf, datasize + 4);
 248 }
 249
 250 void ipx_get_local_target( ubyte * server, ubyte * node, ubyte * local_target )
 251 {
 252         // let's hope Linux knows how to route it
 253         memcpy( local_target, node, 6 );
 254 }
 255
 256 void ipx_send_broadcast_packet_data( ubyte * data, int datasize )
 257 {
 258         int i, j;
 259         ubyte broadcast[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 260         ubyte local_address[6];
 261
 262         // Set to all networks besides mine
 263         for (i=0; i<Ipx_num_networks; i++ )     {
 264                 if ( memcmp( &Ipx_networks[i], &ipx_network, 4 ) )      {
 265                         ipx_get_local_target( (ubyte *)&Ipx_networks[i], broadcast, local_address );
 266                         ipx_send_packet_data( data, datasize, (ubyte *)&Ipx_networks[i], broadcast, local_address );
 267                 } else {
 268                         ipx_send_packet_data( data, datasize, (ubyte *)&Ipx_networks[i], broadcast, broadcast );
 269                 }
 270         }
 271
 272         //OLDipx_send_packet_data( data, datasize, (ubyte *)&ipx_network, broadcast, broadcast );
 273
 274         // Send directly to all users not on my network or in the network list.
 275         for (i=0; i<Ipx_num_users; i++ )        {
 276                 if ( memcmp( Ipx_users[i].network, &ipx_network, 4 ) )  {
 277                         for (j=0; j<Ipx_num_networks; j++ )             {
 278                                 if (!memcmp( Ipx_users[i].network, &Ipx_networks[j], 4 ))
 279                                         goto SkipUser;
 280                         }
 281                         ipx_send_packet_data( data, datasize, Ipx_users[i].network, Ipx_users[i].node, Ipx_users[i].address );
 282 SkipUser:
 283                         j = 0;
 284                 }
 285         }
 286 }
 287
 288 // Sends a non-localized packet... needs 4 byte server, 6 byte address
 289 void ipx_send_internetwork_packet_data( ubyte * data, int datasize, ubyte * server, ubyte *address )
 290 {
 291         ubyte local_address[6];
 292
 293 #ifdef WORDS_NEED_ALIGNMENT
 294         int zero = 0;
 295         if (memcmp(server, &zero, 4)) {
 296 #else // WORDS_NEED_ALIGNMENT
 297         if ((*(uint *)server) != 0) {
 298 #endif // WORDS_NEED_ALIGNMENT
 299                 ipx_get_local_target( server, address, local_address );
 300                 ipx_send_packet_data( data, datasize, server, address, local_address );
 301         } else {
 302                 // Old method, no server info.
 303                 ipx_send_packet_data( data, datasize, server, address, address );
 304         }
 305 }
 306
 307 int ipx_change_default_socket( ushort socket_number )
 308 {
 309         if ( !ipx_installed ) return -3;
 310
 311         driver->CloseSocket(&ipx_socket_data);
 312         if (driver->OpenSocket(&ipx_socket_data, socket_number)) {
 313                 return -3;
 314         }
 315         return 0;
 316 }
 317
 318 void ipx_read_user_file(char * filename)
 319 {
 320         FILE * fp;
 321         user_address tmp;
 322         char temp_line[132], *p1;
 323         int n, ln=0, x;
 324
 325         if (!filename) return;
 326
 327         Ipx_num_users = 0;
 328
 329         fp = fopen( filename, "rt" );
 330         if ( !fp ) return;
 331
 332         printf( "Broadcast Users:\n" );
 333
 334         while (fgets(temp_line, 132, fp)) {
 335                 ln++;
 336                 p1 = strchr(temp_line,'\n'); if (p1) *p1 = '\0';
 337                 p1 = strchr(temp_line,';'); if (p1) *p1 = '\0';
 338 #if 1 // adb: replaced sscanf(..., "%2x...", (char *)...) with better, but longer code
 339                 if (strlen(temp_line) >= 21 && temp_line[8] == '/') {
 340                         for (n = 0; n < 4; n++) {
 341                                 if (sscanf(temp_line + n * 2, "%2x", &x) != 1)
 342                                         break;
 343                                 tmp.network[n] = x;
 344                         }
 345                         if (n != 4)
 346                                 continue;
 347                         for (n = 0; n < 6; n++) {
 348                                 if (sscanf(temp_line + 9 + n * 2, "%2x", &x) != 1)
 349                                         break;
 350                                 tmp.node[n] = x;
 351                         }
 352                         if (n != 6)
 353                                 continue;
 354                 } else
 355                         continue;
 356 #else
 357                 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] );
 358                 if ( n != 10 ) continue;
 359 #endif
 360                 if ( Ipx_num_users < MAX_USERS )        {
 361                         ubyte * ipx_real_buffer = (ubyte *)&tmp;
 362                         ipx_get_local_target( tmp.network, tmp.node, tmp.address );
 363                         Ipx_users[Ipx_num_users++] = tmp;
 364                         printf( "%02X%02X%02X%02X/", ipx_real_buffer[0],ipx_real_buffer[1],ipx_real_buffer[2],ipx_real_buffer[3] );
 365                         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] );
 366                 } else {
 367                         printf( "Too many addresses in %s! (Limit of %d)\n", filename, MAX_USERS );
 368                         fclose(fp);
 369                         return;
 370                 }
 371         }
 372         fclose(fp);
 373 }
 374
 375
 376 void ipx_read_network_file(char * filename)
 377 {
 378         FILE * fp;
 379         user_address tmp;
 380         char temp_line[132], *p1;
 381         int i, n, ln=0, x;
 382
 383         if (!filename) return;
 384
 385         fp = fopen( filename, "rt" );
 386         if ( !fp ) return;
 387
 388         printf( "Using Networks:\n" );
 389         for (i=0; i<Ipx_num_networks; i++ )             {
 390                 ubyte * n1 = (ubyte *)&Ipx_networks[i];
 391                 printf("* %02x%02x%02x%02x\n", n1[0], n1[1], n1[2], n1[3] );
 392         }
 393
 394         while (fgets(temp_line, 132, fp)) {
 395                 ln++;
 396                 p1 = strchr(temp_line,'\n'); if (p1) *p1 = '\0';
 397                 p1 = strchr(temp_line,';'); if (p1) *p1 = '\0';
 398 #if 1 // adb: replaced sscanf(..., "%2x...", (char *)...) with better, but longer code
 399                 if (strlen(temp_line) >= 8) {
 400                         for (n = 0; n < 4; n++) {
 401                                 if (sscanf(temp_line + n * 2, "%2x", &x) != 1)
 402                                         break;
 403                                 tmp.network[n] = x;
 404                         }
 405                         if (n != 4)
 406                                 continue;
 407                 } else
 408                         continue;
 409 #else
 410                 n = sscanf( temp_line, "%2x%2x%2x%2x", &tmp.network[0], &tmp.network[1], &tmp.network[2], &tmp.network[3] );
 411                 if ( n != 4 ) continue;
 412 #endif
 413                 if ( Ipx_num_networks < MAX_NETWORKS  ) {
 414                         int j;
 415                         for (j=0; j<Ipx_num_networks; j++ )
 416                                 if ( !memcmp( &Ipx_networks[j], tmp.network, 4 ) )
 417                                         break;
 418                         if ( j >= Ipx_num_networks )    {
 419                                 memcpy( &Ipx_networks[Ipx_num_networks++], tmp.network, 4 );
 420                                 printf("  %02x%02x%02x%02x\n", tmp.network[0], tmp.network[1], tmp.network[2], tmp.network[3] );
 421                         }
 422                 } else {
 423                         printf( "Too many networks in %s! (Limit of %d)\n", filename, MAX_NETWORKS );
 424                         fclose(fp);
 425                         return;
 426                 }
 427         }
 428         fclose(fp);
 429 }
 430
 431 // Initalizes the protocol-specific member of the netgame packet.
 432 void ipx_init_netgame_aux_data(ubyte buf[])
 433 {
 434         if(driver->InitNetgameAuxData)
 435                 driver->InitNetgameAuxData(&ipx_socket_data, buf);
 436 }
 437
 438 // Handles the protocol-specific member of the netgame packet.
 439 int ipx_handle_netgame_aux_data(const ubyte buf[])
 440 {
 441         if(driver->HandleNetgameAuxData)
 442                 return driver->HandleNetgameAuxData(&ipx_socket_data, buf);
 443         return 0;
 444 }
 445
 446 // Notifies the protocol that we're done with a particular game
 447 void ipx_handle_leave_game()
 448 {
 449         if(driver->HandleLeaveGame)
 450                 driver->HandleLeaveGame(&ipx_socket_data);
 451 }
 452
 453 // Send a packet to every member of the game.
 454 int ipx_send_game_packet(ubyte *data, int datasize)
 455 {
 456         if(driver->SendGamePacket) {
 457                 u_char buf[MAX_IPX_DATA];
 458
 459                 memcpy(buf, &ipx_packetnum, 4);
 460                 ipx_packetnum++;
 461                 memcpy(buf + 4, data, datasize);
 462                 *(uint *)data = ipx_packetnum++;
 463                 return driver->SendGamePacket(&ipx_socket_data, buf, datasize + 4);
 464         } else {
 465                 // Loop through all the players unicasting the packet.
 466                 int i;
 467
 468                 //printf("Sending game packet: N_players = %i\n", N_players);
 469
 470                 for(i=0; i<N_players; i++) {
 471                         if(Players[i].connected && (i != Player_num))
 472                                 ipx_send_packet_data(data, datasize, NetPlayers.players[i].network.ipx.server, NetPlayers.players[i].network.ipx.node,Players[i].net_address);
 473                 }
 474                 return datasize;
 475         }
 476
 477         return 0;
 478 }