arch/linux/linuxnet.c

   1 /* $Id: linuxnet.c,v 1.11 2003-10-10 09:36:34 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 #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 #include "ipx_kali.h"
  44 #include "ipx_udp.h"
  45 //added 05/17/99 Matt Mueller - needed to redefine FD_* so that no asm is used
  46 //#include "checker.h"
  47 //end addition -MM
  48 #include "byteswap.h"
  49
  50 #define MAX_IPX_DATA 576
  51
  52 int ipx_fd;
  53 ipx_socket_t ipx_socket_data;
  54 ubyte ipx_installed=0;
  55 ushort ipx_socket = 0;
  56 uint ipx_network = 0;
  57 ubyte ipx_MyAddress[10];
  58 int ipx_packetnum = 0;                  /* Sequence number */
  59 //int     ipx_packettotal=0,ipx_lastspeed=0;
  60
  61 /* User defined routing stuff */
  62 typedef struct user_address {
  63         ubyte network[4];
  64         ubyte node[6];
  65         ubyte address[6];
  66 } user_address;
  67 #define MAX_USERS 64
  68 int Ipx_num_users = 0;
  69 user_address Ipx_users[MAX_USERS];
  70
  71 #define MAX_NETWORKS 64
  72 int Ipx_num_networks = 0;
  73 uint Ipx_networks[MAX_NETWORKS];
  74
  75 int ipx_general_PacketReady(ipx_socket_t *s) {
  76         fd_set set;
  77         struct timeval tv;
  78
  79         FD_ZERO(&set);
  80         FD_SET(s->fd, &set);
  81         tv.tv_sec = tv.tv_usec = 0;
  82         if (select(s->fd + 1, &set, NULL, NULL, &tv) > 0)
  83                 return 1;
  84         else
  85                 return 0;
  86 }
  87
  88 struct ipx_driver *driver = &ipx_udp;
  89
  90 ubyte * ipx_get_my_server_address()
  91 {
  92         return (ubyte *)&ipx_network;
  93 }
  94
  95 ubyte * ipx_get_my_local_address()
  96 {
  97         return (ubyte *)(ipx_MyAddress + 4);
  98 }
  99
 100 void arch_ipx_set_driver(int ipx_driver)
 101 {
 102         switch(ipx_driver) {
 103 #ifdef NATIVE_IPX
 104         case IPX_DRIVER_IPX: driver = &ipx_bsd; break;
 105 #endif //NATIVE_IPX
 106         case IPX_DRIVER_KALI: driver = &ipx_kali; break;
 107         case IPX_DRIVER_UDP: driver = &ipx_udp; break;
 108         default: Int3();
 109         }
 110 }
 111
 112 int ipx_init(int socket_number)
 113 {
 114         int i;
 115
 116         if ((i = FindArg("-ipxnetwork")) && Args[i + 1]) {
 117                 unsigned long n = strtol(Args[i + 1], NULL, 16);
 118                 ipx_MyAddress[0] = n >> 24; ipx_MyAddress[1] = (n >> 16) & 255;
 119                 ipx_MyAddress[2] = (n >> 8) & 255; ipx_MyAddress[3] = n & 255;
 120                 printf("IPX: Using network %08x\n", (unsigned int)n);
 121         }
 122         if (driver->OpenSocket(&ipx_socket_data, socket_number)) {
 123                 return IPX_NOT_INSTALLED;
 124         }
 125         driver->GetMyAddress();
 126         memcpy(&ipx_network, ipx_MyAddress, 4);
 127         Ipx_num_networks = 0;
 128         memcpy( &Ipx_networks[Ipx_num_networks++], &ipx_network, 4 );
 129         ipx_installed = 1;
 130         atexit(ipx_close);
 131         return IPX_INIT_OK;
 132 }
 133
 134 void ipx_close()
 135 {
 136         if (ipx_installed)
 137                 driver->CloseSocket(&ipx_socket_data);
 138         ipx_installed = 0;
 139 }
 140
 141 int ipx_get_packet_data( ubyte * data )
 142 {
 143         struct ipx_recv_data rd;
 144         char buf[MAX_IPX_DATA];
 145 //killed 6-15-99 to get rid of compile warnings - OE
 146 //      uint best_id = 0;
 147 //      uint pkt_num;
 148 //end kill - OE
 149         int size;
 150         int best_size = 0;
 151 //edited 04/12/99 Matt Mueller - duh, we don't want to throw all that data away!
 152         //--killed-- Like the original, only take latest packet, throw away rest
 153         //do _NOT_ throw them away!
 154         while (driver->PacketReady(&ipx_socket_data)) {
 155                 if ((size =
 156                      driver->ReceivePacket(&ipx_socket_data, buf,
 157                       sizeof(buf), &rd)) > 4) {
 158                      if (!memcmp(rd.src_network, ipx_MyAddress, 10))
 159                         continue;       /* don't get own pkts */
 160 //--killed--                 pkt_num = INTEL_INT(*(uint *)buf);
 161 //--killed--                 if (pkt_num >= best_id) {
 162                         memcpy(data, buf + 4, size - 4);
 163                                 return size-4;
 164 //--killed--                    best_id = pkt_num;
 165 //--killed--                    best_size = size - 4;
 166 //--killed--                 }
 167 //end edit -MM
 168                 }
 169         }
 170         return best_size;
 171 }
 172
 173 void ipx_send_packet_data( ubyte * data, int datasize, ubyte *network, ubyte *address, ubyte *immediate_address )
 174 {
 175         u_char buf[MAX_IPX_DATA];
 176         IPXPacket_t ipx_header;
 177
 178         memcpy(ipx_header.Destination.Network, network, 4);
 179         memcpy(ipx_header.Destination.Node, immediate_address, 6);
 180         *(u_short *)ipx_header.Destination.Socket = htons(ipx_socket_data.socket);
 181         ipx_header.PacketType = 4; /* Packet Exchange */
 182         *(uint *)buf = INTEL_INT(ipx_packetnum);
 183         ipx_packetnum++;
 184     //ipx_packettotal+=datasize+4;
 185     //if (f2i(Players[Player_num].time_level) && (f2i(Players[Player_num].time_level)%10!=ipx_lastspeed))
 186         //{
 187         //   ipx_lastspeed=f2i(Players[Player_num].time_level)%10;
 188         //   printf("tot=%i,t2=%i,time=%i,avg=%i,a2=%i\n",ipx_packetnum,ipx_packettotal,(int)f2i(Players[Player_num].time_level),
 189         //          ipx_packetnum/(int)f2i(Players[Player_num].time_level),
 190         //          ipx_packettotal/(int)f2i(Players[Player_num].time_level));
 191         //}
 192         memcpy(buf + 4, data, datasize);
 193         driver->SendPacket(&ipx_socket_data, &ipx_header, buf, datasize + 4);
 194 }
 195
 196 void ipx_get_local_target( ubyte * server, ubyte * node, ubyte * local_target )
 197 {
 198         // let's hope Linux knows how to route it
 199         memcpy( local_target, node, 6 );
 200 }
 201
 202 void ipx_send_broadcast_packet_data( ubyte * data, int datasize )
 203 {
 204         int i, j;
 205         ubyte broadcast[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 206         ubyte local_address[6];
 207
 208         // Set to all networks besides mine
 209         for (i=0; i<Ipx_num_networks; i++ )     {
 210                 if ( memcmp( &Ipx_networks[i], &ipx_network, 4 ) )      {
 211                         ipx_get_local_target( (ubyte *)&Ipx_networks[i], broadcast, local_address );
 212                         ipx_send_packet_data( data, datasize, (ubyte *)&Ipx_networks[i], broadcast, local_address );
 213                 } else {
 214                         ipx_send_packet_data( data, datasize, (ubyte *)&Ipx_networks[i], broadcast, broadcast );
 215                 }
 216         }
 217
 218         //OLDipx_send_packet_data( data, datasize, (ubyte *)&ipx_network, broadcast, broadcast );
 219
 220         // Send directly to all users not on my network or in the network list.
 221         for (i=0; i<Ipx_num_users; i++ )        {
 222                 if ( memcmp( Ipx_users[i].network, &ipx_network, 4 ) )  {
 223                         for (j=0; j<Ipx_num_networks; j++ )             {
 224                                 if (!memcmp( Ipx_users[i].network, &Ipx_networks[j], 4 ))
 225                                         goto SkipUser;
 226                         }
 227                         ipx_send_packet_data( data, datasize, Ipx_users[i].network, Ipx_users[i].node, Ipx_users[i].address );
 228 SkipUser:
 229                         j = 0;
 230                 }
 231         }
 232 }
 233
 234 // Sends a non-localized packet... needs 4 byte server, 6 byte address
 235 void ipx_send_internetwork_packet_data( ubyte * data, int datasize, ubyte * server, ubyte *address )
 236 {
 237         ubyte local_address[6];
 238
 239 #ifdef WORDS_NEED_ALIGNMENT
 240         int zero = 0;
 241         if (memcmp(server, &zero, 4)) {
 242 #else // WORDS_NEED_ALIGNMENT
 243         if ((*(uint *)server) != 0) {
 244 #endif // WORDS_NEED_ALIGNMENT
 245                 ipx_get_local_target( server, address, local_address );
 246                 ipx_send_packet_data( data, datasize, server, address, local_address );
 247         } else {
 248                 // Old method, no server info.
 249                 ipx_send_packet_data( data, datasize, server, address, address );
 250         }
 251 }
 252
 253 int ipx_change_default_socket( ushort socket_number )
 254 {
 255         if ( !ipx_installed ) return -3;
 256
 257         driver->CloseSocket(&ipx_socket_data);
 258         if (driver->OpenSocket(&ipx_socket_data, socket_number)) {
 259                 return -3;
 260         }
 261         return 0;
 262 }
 263
 264 void ipx_read_user_file(char * filename)
 265 {
 266         FILE * fp;
 267         user_address tmp;
 268         char temp_line[132], *p1;
 269         int n, ln=0, x;
 270
 271         if (!filename) return;
 272
 273         Ipx_num_users = 0;
 274
 275         fp = fopen( filename, "rt" );
 276         if ( !fp ) return;
 277
 278         printf( "Broadcast Users:\n" );
 279
 280         while (fgets(temp_line, 132, fp)) {
 281                 ln++;
 282                 p1 = strchr(temp_line,'\n'); if (p1) *p1 = '\0';
 283                 p1 = strchr(temp_line,';'); if (p1) *p1 = '\0';
 284 #if 1 // adb: replaced sscanf(..., "%2x...", (char *)...) with better, but longer code
 285                 if (strlen(temp_line) >= 21 && temp_line[8] == '/') {
 286                         for (n = 0; n < 4; n++) {
 287                                 if (sscanf(temp_line + n * 2, "%2x", &x) != 1)
 288                                         break;
 289                                 tmp.network[n] = x;
 290                         }
 291                         if (n != 4)
 292                                 continue;
 293                         for (n = 0; n < 6; n++) {
 294                                 if (sscanf(temp_line + 9 + n * 2, "%2x", &x) != 1)
 295                                         break;
 296                                 tmp.node[n] = x;
 297                         }
 298                         if (n != 6)
 299                                 continue;
 300                 } else
 301                         continue;
 302 #else
 303                 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] );
 304                 if ( n != 10 ) continue;
 305 #endif
 306                 if ( Ipx_num_users < MAX_USERS )        {
 307                         ubyte * ipx_real_buffer = (ubyte *)&tmp;
 308                         ipx_get_local_target( tmp.network, tmp.node, tmp.address );
 309                         Ipx_users[Ipx_num_users++] = tmp;
 310                         printf( "%02X%02X%02X%02X/", ipx_real_buffer[0],ipx_real_buffer[1],ipx_real_buffer[2],ipx_real_buffer[3] );
 311                         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] );
 312                 } else {
 313                         printf( "Too many addresses in %s! (Limit of %d)\n", filename, MAX_USERS );
 314                         fclose(fp);
 315                         return;
 316                 }
 317         }
 318         fclose(fp);
 319 }
 320
 321
 322 void ipx_read_network_file(char * filename)
 323 {
 324         FILE * fp;
 325         user_address tmp;
 326         char temp_line[132], *p1;
 327         int i, n, ln=0, x;
 328
 329         if (!filename) return;
 330
 331         fp = fopen( filename, "rt" );
 332         if ( !fp ) return;
 333
 334         printf( "Using Networks:\n" );
 335         for (i=0; i<Ipx_num_networks; i++ )             {
 336                 ubyte * n1 = (ubyte *)&Ipx_networks[i];
 337                 printf("* %02x%02x%02x%02x\n", n1[0], n1[1], n1[2], n1[3] );
 338         }
 339
 340         while (fgets(temp_line, 132, fp)) {
 341                 ln++;
 342                 p1 = strchr(temp_line,'\n'); if (p1) *p1 = '\0';
 343                 p1 = strchr(temp_line,';'); if (p1) *p1 = '\0';
 344 #if 1 // adb: replaced sscanf(..., "%2x...", (char *)...) with better, but longer code
 345                 if (strlen(temp_line) >= 8) {
 346                         for (n = 0; n < 4; n++) {
 347                                 if (sscanf(temp_line + n * 2, "%2x", &x) != 1)
 348                                         break;
 349                                 tmp.network[n] = x;
 350                         }
 351                         if (n != 4)
 352                                 continue;
 353                 } else
 354                         continue;
 355 #else
 356                 n = sscanf( temp_line, "%2x%2x%2x%2x", &tmp.network[0], &tmp.network[1], &tmp.network[2], &tmp.network[3] );
 357                 if ( n != 4 ) continue;
 358 #endif
 359                 if ( Ipx_num_networks < MAX_NETWORKS  ) {
 360                         int j;
 361                         for (j=0; j<Ipx_num_networks; j++ )
 362                                 if ( !memcmp( &Ipx_networks[j], tmp.network, 4 ) )
 363                                         break;
 364                         if ( j >= Ipx_num_networks )    {
 365                                 memcpy( &Ipx_networks[Ipx_num_networks++], tmp.network, 4 );
 366                                 printf("  %02x%02x%02x%02x\n", tmp.network[0], tmp.network[1], tmp.network[2], tmp.network[3] );
 367                         }
 368                 } else {
 369                         printf( "Too many networks in %s! (Limit of %d)\n", filename, MAX_NETWORKS );
 370                         fclose(fp);
 371                         return;
 372                 }
 373         }
 374         fclose(fp);
 375 }