1 /*
2 Copyright (C) 1996-1997 Id Software, Inc.
3
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12
13 See the GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18
19 */
20 // net_udp.c
21
22 #include "quakedef.h"
23
24 #include <sys/types.h>
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <netdb.h>
28 #include <arpa/inet.h> /* for inet_addr() */
29 #include <sys/param.h>
30 #include <sys/ioctl.h>
31 #include <errno.h>
32
33 #ifdef __sun__
34 #include <sys/filio.h>
35 #endif
36
37 #if defined(NeXT) || defined(__APPLE__) || defined(MACOSX)
38 #include <libc.h>
39 #endif
40
41 extern int gethostname (char *, int);
42 extern int close (int);
43
44 extern cvar_t hostname;
45
46 static int net_acceptsocket = -1; // socket for fielding new connections
47 static int net_controlsocket;
48 static int net_broadcastsocket = 0;
49 static struct qsockaddr broadcastaddr;
50
51 static unsigned long myAddr;
52
53 #include "net_udp.h"
54
55 //=============================================================================
56
UDP_Init(void)57 int UDP_Init (void)
58 {
59 struct hostent *local;
60 char buff[MAXHOSTNAMELEN];
61 struct qsockaddr addr;
62 char *colon;
63
64 if (COM_CheckParm ("-noudp"))
65 return -1;
66
67 // determine my name & address
68 #if !defined(_WIN32)
69
70 if (gethostname(buff, MAXHOSTNAMELEN) != 0)
71 {
72 Con_Printf ("UDP init failed. Disabling UDP...\n");
73 return (-1);
74 }
75 local = gethostbyname(buff);
76 if (local == NULL)
77 {
78 Con_Printf ("UDP init failed. Disabling UDP...\n");
79 return (-1);
80 }
81
82 #else
83
84 gethostname(buff, MAXHOSTNAMELEN);
85 local = gethostbyname(buff);
86
87 #endif /* !_WIN32 */
88
89 myAddr = *(int *)local->h_addr_list[0];
90
91 // if the quake hostname isn't set, set it to the machine name
92 if (Q_strcmp(hostname.string, "UNNAMED") == 0)
93 {
94 buff[15] = 0;
95 Cvar_Set ("hostname", buff);
96 }
97
98 if ((net_controlsocket = UDP_OpenSocket (0)) == -1)
99 Sys_Error("UDP_Init: Unable to open control socket\n");
100
101 ((struct sockaddr_in *)&broadcastaddr)->sin_family = AF_INET;
102 ((struct sockaddr_in *)&broadcastaddr)->sin_addr.s_addr = INADDR_BROADCAST;
103 ((struct sockaddr_in *)&broadcastaddr)->sin_port = htons(net_hostport);
104
105 #if !defined (_WIN32)
106
107 if (UDP_GetSocketAddr (net_controlsocket, &addr) != 0)
108 {
109 Con_Printf ("UDP init failed. Disabling UDP...\n");
110 return (-1);
111 }
112
113 #else
114
115 UDP_GetSocketAddr (net_controlsocket, &addr);
116
117 #endif /* !_WIN32 */
118
119 Q_strcpy(my_tcpip_address, UDP_AddrToString (&addr));
120 colon = Q_strrchr (my_tcpip_address, ':');
121 if (colon)
122 *colon = 0;
123
124 Con_Printf("UDP Initialized\n");
125 tcpipAvailable = true;
126
127 return net_controlsocket;
128 }
129
130 //=============================================================================
131
UDP_Shutdown(void)132 void UDP_Shutdown (void)
133 {
134 UDP_Listen (false);
135 UDP_CloseSocket (net_controlsocket);
136 }
137
138 //=============================================================================
139
UDP_Listen(qboolean state)140 void UDP_Listen (qboolean state)
141 {
142 // enable listening
143 if (state)
144 {
145 if (net_acceptsocket != -1)
146 return;
147 if ((net_acceptsocket = UDP_OpenSocket (net_hostport)) == -1)
148 Sys_Error ("UDP_Listen: Unable to open accept socket\n");
149 return;
150 }
151
152 // disable listening
153 if (net_acceptsocket == -1)
154 return;
155 UDP_CloseSocket (net_acceptsocket);
156 net_acceptsocket = -1;
157 }
158
159 //=============================================================================
160
UDP_OpenSocket(int port)161 int UDP_OpenSocket (int port)
162 {
163 int newsocket;
164 struct sockaddr_in address;
165 qboolean _true = true;
166
167 if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
168 return -1;
169
170 if (ioctl (newsocket, FIONBIO, (char *)&_true) == -1)
171 goto ErrorReturn;
172
173 address.sin_family = AF_INET;
174 address.sin_addr.s_addr = INADDR_ANY;
175 address.sin_port = htons(port);
176 if( bind (newsocket, (void *)&address, sizeof(address)) == -1)
177 goto ErrorReturn;
178
179 return newsocket;
180
181 ErrorReturn:
182 close (newsocket);
183 return -1;
184 }
185
186 //=============================================================================
187
UDP_CloseSocket(int socket)188 int UDP_CloseSocket (int socket)
189 {
190 if (socket == net_broadcastsocket)
191 net_broadcastsocket = 0;
192 return close (socket);
193 }
194
195
196 //=============================================================================
197 /*
198 ============
199 PartialIPAddress
200
201 this lets you type only as much of the net address as required, using
202 the local network components to fill in the rest
203 ============
204 */
PartialIPAddress(char * in,struct qsockaddr * hostaddr)205 static int PartialIPAddress (char *in, struct qsockaddr *hostaddr)
206 {
207 char buff[256];
208 char *b;
209 int addr;
210 int num;
211 int mask;
212 int run;
213 int port;
214
215 buff[0] = '.';
216 b = buff;
217 strcpy(buff+1, in);
218 if (buff[1] == '.')
219 b++;
220
221 addr = 0;
222 mask=-1;
223 while (*b == '.')
224 {
225 b++;
226 num = 0;
227 run = 0;
228 while (!( *b < '0' || *b > '9'))
229 {
230 num = num*10 + *b++ - '0';
231 if (++run > 3)
232 return -1;
233 }
234 if ((*b < '0' || *b > '9') && *b != '.' && *b != ':' && *b != 0)
235 return -1;
236 if (num < 0 || num > 255)
237 return -1;
238 mask<<=8;
239 addr = (addr<<8) + num;
240 }
241
242 if (*b++ == ':')
243 port = Q_atoi(b);
244 else
245 port = net_hostport;
246
247 hostaddr->sa_family = AF_INET;
248 ((struct sockaddr_in *)hostaddr)->sin_port = htons((short)port);
249 ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr = (myAddr & htonl(mask)) | htonl(addr);
250
251 return 0;
252 }
253 //=============================================================================
254
UDP_Connect(int socket,struct qsockaddr * addr)255 int UDP_Connect (int socket, struct qsockaddr *addr)
256 {
257 return 0;
258 }
259
260 //=============================================================================
261
UDP_CheckNewConnections(void)262 int UDP_CheckNewConnections (void)
263 {
264 unsigned long available;
265
266 if (net_acceptsocket == -1)
267 return -1;
268
269 if (ioctl (net_acceptsocket, FIONREAD, &available) == -1)
270 Sys_Error ("UDP: ioctlsocket (FIONREAD) failed\n");
271 if (available)
272 return net_acceptsocket;
273 return -1;
274 }
275
276 //=============================================================================
277
UDP_Read(int socket,byte * buf,int len,struct qsockaddr * addr)278 int UDP_Read (int socket, byte *buf, int len, struct qsockaddr *addr)
279 {
280 int addrlen = sizeof (struct qsockaddr);
281 int ret;
282
283 ret = recvfrom (socket, buf, len, 0, (struct sockaddr *)addr, &addrlen);
284 if (ret == -1 && (errno == EWOULDBLOCK || errno == ECONNREFUSED))
285 return 0;
286 return ret;
287 }
288
289 //=============================================================================
290
UDP_MakeSocketBroadcastCapable(int socket)291 int UDP_MakeSocketBroadcastCapable (int socket)
292 {
293 int i = 1;
294
295 // make this socket broadcast capable
296 if (setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i)) < 0)
297 return -1;
298 net_broadcastsocket = socket;
299
300 return 0;
301 }
302
303 //=============================================================================
304
UDP_Broadcast(int socket,byte * buf,int len)305 int UDP_Broadcast (int socket, byte *buf, int len)
306 {
307 int ret;
308
309 if (socket != net_broadcastsocket)
310 {
311 if (net_broadcastsocket != 0)
312 Sys_Error("Attempted to use multiple broadcasts sockets\n");
313 ret = UDP_MakeSocketBroadcastCapable (socket);
314 if (ret == -1)
315 {
316 Con_Printf("Unable to make socket broadcast capable\n");
317 return ret;
318 }
319 }
320
321 return UDP_Write (socket, buf, len, &broadcastaddr);
322 }
323
324 //=============================================================================
325
UDP_Write(int socket,byte * buf,int len,struct qsockaddr * addr)326 int UDP_Write (int socket, byte *buf, int len, struct qsockaddr *addr)
327 {
328 int ret;
329
330 ret = sendto (socket, buf, len, 0, (struct sockaddr *)addr, sizeof(struct qsockaddr));
331 if (ret == -1 && errno == EWOULDBLOCK)
332 return 0;
333 return ret;
334 }
335
336 //=============================================================================
337
UDP_AddrToString(struct qsockaddr * addr)338 char *UDP_AddrToString (struct qsockaddr *addr)
339 {
340 static char buffer[22];
341 int haddr;
342
343 haddr = ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr);
344 sprintf(buffer, "%d.%d.%d.%d:%d", (haddr >> 24) & 0xff, (haddr >> 16) & 0xff, (haddr >> 8) & 0xff, haddr & 0xff, ntohs(((struct sockaddr_in *)addr)->sin_port));
345 return buffer;
346 }
347
348 //=============================================================================
349
UDP_StringToAddr(char * string,struct qsockaddr * addr)350 int UDP_StringToAddr (char *string, struct qsockaddr *addr)
351 {
352 int ha1, ha2, ha3, ha4, hp;
353 int ipaddr;
354
355 sscanf(string, "%d.%d.%d.%d:%d", &ha1, &ha2, &ha3, &ha4, &hp);
356 ipaddr = (ha1 << 24) | (ha2 << 16) | (ha3 << 8) | ha4;
357
358 addr->sa_family = AF_INET;
359 ((struct sockaddr_in *)addr)->sin_addr.s_addr = htonl(ipaddr);
360 ((struct sockaddr_in *)addr)->sin_port = htons(hp);
361 return 0;
362 }
363
364 //=============================================================================
365
UDP_GetSocketAddr(int socket,struct qsockaddr * addr)366 int UDP_GetSocketAddr (int socket, struct qsockaddr *addr)
367 {
368 int addrlen = sizeof(struct qsockaddr);
369 unsigned int a;
370
371 Q_memset(addr, 0, sizeof(struct qsockaddr));
372
373 #if !defined(_WIN32)
374
375 if (getsockname(socket, (struct sockaddr *)addr, &addrlen) != 0)
376 return (-1);
377
378 #else
379
380 getsockname(socket, (struct sockaddr *)addr, &addrlen);
381
382 #endif /* !_WIN32 */
383
384 a = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
385 if (a == 0 || a == inet_addr("127.0.0.1"))
386 ((struct sockaddr_in *)addr)->sin_addr.s_addr = myAddr;
387
388 return 0;
389 }
390
391 //=============================================================================
392
UDP_GetNameFromAddr(struct qsockaddr * addr,char * name)393 int UDP_GetNameFromAddr (struct qsockaddr *addr, char *name)
394 {
395 struct hostent *hostentry;
396
397 hostentry = gethostbyaddr ((char *)&((struct sockaddr_in *)addr)->sin_addr, sizeof(struct in_addr), AF_INET);
398 if (hostentry)
399 {
400 Q_strncpy (name, (char *)hostentry->h_name, NET_NAMELEN - 1);
401 return 0;
402 }
403
404 Q_strcpy (name, UDP_AddrToString (addr));
405 return 0;
406 }
407
408 //=============================================================================
409
UDP_GetAddrFromName(char * name,struct qsockaddr * addr)410 int UDP_GetAddrFromName(char *name, struct qsockaddr *addr)
411 {
412 struct hostent *hostentry;
413
414 if (name[0] >= '0' && name[0] <= '9')
415 return PartialIPAddress (name, addr);
416
417 hostentry = gethostbyname (name);
418 if (!hostentry)
419 return -1;
420
421 addr->sa_family = AF_INET;
422 ((struct sockaddr_in *)addr)->sin_port = htons(net_hostport);
423 ((struct sockaddr_in *)addr)->sin_addr.s_addr = *(int *)hostentry->h_addr_list[0];
424
425 return 0;
426 }
427
428 //=============================================================================
429
UDP_AddrCompare(struct qsockaddr * addr1,struct qsockaddr * addr2)430 int UDP_AddrCompare (struct qsockaddr *addr1, struct qsockaddr *addr2)
431 {
432 if (addr1->sa_family != addr2->sa_family)
433 return -1;
434
435 if (((struct sockaddr_in *)addr1)->sin_addr.s_addr != ((struct sockaddr_in *)addr2)->sin_addr.s_addr)
436 return -1;
437
438 if (((struct sockaddr_in *)addr1)->sin_port != ((struct sockaddr_in *)addr2)->sin_port)
439 return 1;
440
441 return 0;
442 }
443
444 //=============================================================================
445
UDP_GetSocketPort(struct qsockaddr * addr)446 int UDP_GetSocketPort (struct qsockaddr *addr)
447 {
448 return ntohs(((struct sockaddr_in *)addr)->sin_port);
449 }
450
451
UDP_SetSocketPort(struct qsockaddr * addr,int port)452 int UDP_SetSocketPort (struct qsockaddr *addr, int port)
453 {
454 ((struct sockaddr_in *)addr)->sin_port = htons(port);
455 return 0;
456 }
457
458 //=============================================================================
459