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