add IPv4 multicasting support
[btb/d2x.git] / 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 }