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
21 #include <winsock2.h>
22
23 #include "console.h"
24 #include "net.h"
25 #include "net_wins.h"
26 #include "quakedef.h"
27 #include "sys.h"
28 #include "winquake.h"
29
30 /* socket for fielding new connections */
31 static int net_acceptsocket = -1;
32 static int net_controlsocket;
33 static int net_broadcastsocket = 0;
34 static netadr_t broadcastaddr;
35
36 /*
37 * There are three addresses that we may use in different ways:
38 * myAddr - This is the "default" address returned by the OS
39 * localAddr - This is an address to advertise in CCREP_SERVER_INFO
40 * and CCREP_ACCEPT response packets, rather than the
41 * default address (sometimes the default address is not
42 * suitable for LAN clients; i.e. loopback address). Set
43 * on the command line using the "-localip" option.
44 * bindAddr - The address to which we bind our network socket. The
45 * default is INADDR_ANY, but in some cases we may want
46 * to only listen on a particular address. Set on the
47 * command line using the "-ip" option.
48 */
49 static netadr_t myAddr;
50 static netadr_t localAddr;
51 static netadr_t bindAddr;
52
53 int winsock_initialized = 0;
54 WSADATA winsockdata;
55
56 static double blocktime;
57
58
59 static void
NetadrToSockadr(const netadr_t * a,struct sockaddr_in * s)60 NetadrToSockadr(const netadr_t *a, struct sockaddr_in *s)
61 {
62 memset(s, 0, sizeof(*s));
63 s->sin_family = AF_INET;
64
65 s->sin_addr.s_addr = a->ip.l;
66 s->sin_port = a->port;
67 }
68
69 static void
SockadrToNetadr(const struct sockaddr_in * s,netadr_t * a)70 SockadrToNetadr(const struct sockaddr_in *s, netadr_t *a)
71 {
72 a->ip.l = s->sin_addr.s_addr;
73 a->port = s->sin_port;
74 }
75
76 static BOOL PASCAL FAR
BlockingHook(void)77 BlockingHook(void)
78 {
79 MSG msg;
80 BOOL ret;
81
82 if ((Sys_DoubleTime() - blocktime) > 2.0) {
83 WSACancelBlockingCall();
84 return FALSE;
85 }
86
87 /* get the next message, if any */
88 ret = (BOOL)PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
89
90 /* if we got one, process it */
91 if (ret) {
92 TranslateMessage(&msg);
93 DispatchMessage(&msg);
94 }
95
96 /* TRUE if we got a message */
97 return ret;
98 }
99
100
101 int
WINS_Init(void)102 WINS_Init(void)
103 {
104 int i;
105 int err;
106 char buff[MAXHOSTNAMELEN];
107 char *colon;
108 struct hostent *local;
109 netadr_t addr;
110
111 if (COM_CheckParm("-noudp"))
112 return -1;
113
114 if (!winsock_initialized) {
115 err = WSAStartup(MAKEWORD(1,1), &winsockdata);
116 if (err) {
117 Con_SafePrintf("Winsock initialization failed.\n");
118 return -1;
119 }
120 }
121 winsock_initialized++;
122
123 /* determine my name & address */
124 myAddr.ip.l = htonl(INADDR_LOOPBACK);
125 myAddr.port = htons(DEFAULTnet_hostport);
126 err = gethostname(buff, MAXHOSTNAMELEN);
127 if (err) {
128 Con_Printf("%s: WARNING: gethostname failed.\n", __func__);
129 } else {
130 buff[MAXHOSTNAMELEN - 1] = 0;
131 blocktime = Sys_DoubleTime();
132 WSASetBlockingHook(BlockingHook);
133 local = gethostbyname(buff);
134 WSAUnhookBlockingHook();
135 if (!local) {
136 Con_Printf("%s: WARNING: gethostbyname timed out.\n", __func__);
137 } else if (local->h_addrtype != AF_INET) {
138 Con_Printf("%s: address from gethostbyname not IPv4\n", __func__);
139 } else {
140 struct in_addr *inaddr = (struct in_addr *)local->h_addr_list[0];
141 myAddr.ip.l = inaddr->S_un.S_addr;
142 }
143 }
144 Con_Printf("UDP, Local address: %s\n", NET_AdrToString(&myAddr));
145
146 i = COM_CheckParm("-ip");
147 if (i && i < com_argc - 1) {
148 bindAddr.ip.l = inet_addr(com_argv[i + 1]);
149 if (bindAddr.ip.l == INADDR_NONE)
150 Sys_Error("%s: %s is not a valid IP address", __func__,
151 com_argv[i + 1]);
152 Con_Printf("Binding to IP Interface Address of %s\n", com_argv[i + 1]);
153 } else {
154 bindAddr.ip.l = INADDR_NONE;
155 }
156
157 i = COM_CheckParm("-localip");
158 if (i && i < com_argc - 1) {
159 localAddr.ip.l = inet_addr(com_argv[i + 1]);
160 if (localAddr.ip.l == INADDR_NONE)
161 Sys_Error("%s: %s is not a valid IP address", __func__,
162 com_argv[i + 1]);
163 Con_Printf("Advertising %s as the local IP in response packets\n",
164 com_argv[i + 1]);
165 } else {
166 localAddr.ip.l = INADDR_NONE;
167 }
168
169 net_controlsocket = WINS_OpenSocket(0);
170 if (net_controlsocket == -1) {
171 Con_Printf("%s: Unable to open control socket\n", __func__);
172 if (--winsock_initialized == 0)
173 WSACleanup();
174 return -1;
175 }
176
177 broadcastaddr.ip.l = INADDR_BROADCAST;
178 broadcastaddr.port = htons(net_hostport);
179
180 WINS_GetSocketAddr(net_controlsocket, &addr);
181 strcpy(my_tcpip_address, NET_AdrToString(&addr));
182 colon = strrchr(my_tcpip_address, ':');
183 if (colon)
184 *colon = 0;
185
186 Con_Printf("Winsock TCP/IP Initialized (%s)\n", my_tcpip_address);
187 tcpipAvailable = true;
188
189 return net_controlsocket;
190 }
191
192
193 void
WINS_Shutdown(void)194 WINS_Shutdown(void)
195 {
196 WINS_Listen(false);
197 WINS_CloseSocket(net_controlsocket);
198 if (--winsock_initialized == 0)
199 WSACleanup();
200 }
201
202
203 void
WINS_Listen(qboolean state)204 WINS_Listen(qboolean state)
205 {
206 /* enable listening */
207 if (state) {
208 if (net_acceptsocket != -1)
209 return;
210 if ((net_acceptsocket = WINS_OpenSocket(net_hostport)) == -1)
211 Sys_Error("%s: Unable to open accept socket", __func__);
212 return;
213 }
214
215 /* disable listening */
216 if (net_acceptsocket == -1)
217 return;
218
219 WINS_CloseSocket(net_acceptsocket);
220 net_acceptsocket = -1;
221 }
222
223
224 int
WINS_OpenSocket(int port)225 WINS_OpenSocket(int port)
226 {
227 int newsocket;
228 struct sockaddr_in address;
229 netadr_t addr;
230 u_long _true = 1;
231
232 if ((newsocket = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
233 return -1;
234 if (ioctlsocket(newsocket, FIONBIO, &_true) == -1)
235 goto ErrorReturn;
236
237 address.sin_family = AF_INET;
238 if (bindAddr.ip.l != INADDR_NONE)
239 address.sin_addr.s_addr = bindAddr.ip.l;
240 else
241 address.sin_addr.s_addr = INADDR_ANY;
242 address.sin_port = htons((unsigned short)port);
243 if (bind(newsocket, (struct sockaddr *)&address, sizeof(address)) == 0)
244 return newsocket;
245
246 SockadrToNetadr(&address, &addr);
247 if (tcpipAvailable)
248 Sys_Error("Unable to bind to %s", NET_AdrToString(&addr));
249 else /* we are still in init phase, no need to error */
250 Con_Printf("Unable to bind to %s\n", NET_AdrToString(&addr));
251
252 ErrorReturn:
253 closesocket(newsocket);
254 return -1;
255 }
256
257
258 int
WINS_CloseSocket(int socket)259 WINS_CloseSocket(int socket)
260 {
261 if (socket == net_broadcastsocket)
262 net_broadcastsocket = 0;
263 return closesocket(socket);
264 }
265
266
267 int
WINS_CheckNewConnections(void)268 WINS_CheckNewConnections(void)
269 {
270 char buf[4096];
271 int ret;
272
273 if (net_acceptsocket == -1)
274 return -1;
275
276 ret = recvfrom(net_acceptsocket, buf, sizeof(buf), MSG_PEEK, NULL, NULL);
277 if (ret >= 0)
278 return net_acceptsocket;
279
280 return -1;
281 }
282
283
284 int
WINS_Read(int socket,void * buf,int len,netadr_t * addr)285 WINS_Read(int socket, void *buf, int len, netadr_t *addr)
286 {
287 struct sockaddr_in saddr;
288 int addrlen = sizeof(saddr);
289 int ret;
290
291 ret = recvfrom(socket, (char *)buf, len, 0, (struct sockaddr *)&saddr,
292 &addrlen);
293 SockadrToNetadr(&saddr, addr);
294 if (ret == -1) {
295 int err = WSAGetLastError();
296
297 if (err == WSAEWOULDBLOCK || err == WSAECONNREFUSED)
298 return 0;
299 }
300 return ret;
301 }
302
303
304 static int
WINS_MakeSocketBroadcastCapable(int socket)305 WINS_MakeSocketBroadcastCapable(int socket)
306 {
307 int i = 1;
308
309 /* make this socket broadcast capable */
310 if (setsockopt
311 (socket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i)) < 0)
312 return -1;
313 net_broadcastsocket = socket;
314
315 return 0;
316 }
317
318
319 int
WINS_Broadcast(int socket,const void * buf,int len)320 WINS_Broadcast(int socket, const void *buf, int len)
321 {
322 int ret;
323
324 if (socket != net_broadcastsocket) {
325 if (net_broadcastsocket != 0)
326 Sys_Error("Attempted to use multiple broadcasts sockets");
327 ret = WINS_MakeSocketBroadcastCapable(socket);
328 if (ret == -1) {
329 Con_Printf("Unable to make socket broadcast capable\n");
330 return ret;
331 }
332 }
333
334 return WINS_Write(socket, buf, len, &broadcastaddr);
335 }
336
337
338 int
WINS_Write(int socket,const void * buf,int len,const netadr_t * addr)339 WINS_Write(int socket, const void *buf, int len, const netadr_t *addr)
340 {
341 struct sockaddr_in saddr;
342 int ret;
343
344 NetadrToSockadr(addr, &saddr);
345 ret = sendto(socket, (char *)buf, len, 0, (struct sockaddr *)&saddr,
346 sizeof(saddr));
347 if (ret == -1)
348 if (WSAGetLastError() == WSAEWOULDBLOCK)
349 return 0;
350
351 return ret;
352 }
353
354
355 int
WINS_GetSocketAddr(int socket,netadr_t * addr)356 WINS_GetSocketAddr(int socket, netadr_t *addr)
357 {
358 struct sockaddr_in saddr;
359 int len = sizeof(saddr);
360
361 memset(&saddr, 0, len);
362 getsockname(socket, (struct sockaddr *)&saddr, &len);
363
364 /*
365 * The returned IP is embedded in our repsonse to a broadcast request for
366 * server info from clients. The server admin may wish to advertise a
367 * specific IP for various reasons, so allow the "default" address
368 * returned by the OS to be overridden.
369 */
370 if (localAddr.ip.l != INADDR_NONE)
371 saddr.sin_addr.s_addr = localAddr.ip.l;
372 else {
373 struct in_addr a = saddr.sin_addr;
374 if (!a.s_addr || a.s_addr == htonl(INADDR_LOOPBACK))
375 saddr.sin_addr.s_addr = myAddr.ip.l;
376 }
377 SockadrToNetadr(&saddr, addr);
378
379 return 0;
380 }
381
382
383 int
WINS_GetNameFromAddr(const netadr_t * addr,char * name)384 WINS_GetNameFromAddr(const netadr_t *addr, char *name)
385 {
386 struct hostent *hostentry;
387
388 hostentry = gethostbyaddr((char *)&addr->ip.l, sizeof(addr->ip.l), AF_INET);
389 if (hostentry) {
390 strncpy(name, (char *)hostentry->h_name, NET_NAMELEN - 1);
391 return 0;
392 }
393 strcpy(name, NET_AdrToString(addr));
394
395 return 0;
396 }
397
398
399 int
WINS_GetAddrFromName(const char * name,netadr_t * addr)400 WINS_GetAddrFromName(const char *name, netadr_t *addr)
401 {
402 struct hostent *hostentry;
403
404 if (name[0] >= '0' && name[0] <= '9')
405 return NET_PartialIPAddress(name, &myAddr, addr);
406
407 hostentry = gethostbyname(name);
408 if (!hostentry)
409 return -1;
410
411 addr->ip.l = *(int *)hostentry->h_addr_list[0];
412 addr->port = htons(net_hostport);
413
414 return 0;
415 }
416
417
418 int
WINS_GetDefaultMTU(void)419 WINS_GetDefaultMTU(void)
420 {
421 return 1400;
422 }
423