/
net_udp.c
377 lines (290 loc) · 8.91 KB
/
net_udp.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
/*
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// net_udp.c
#include "quakedef.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <unistd.h>
#ifdef __sun__
#include <sys/filio.h>
#endif
#ifdef NeXT
#include <libc.h>
#endif
extern int close (int);
extern cvar_t hostname;
static int net_acceptsocket = -1; // socket for fielding new connections
static int net_broadcastsocket = 0;
#include "net_udp.h"
//=============================================================================
void UDP_Shutdown (void)
{
UDP_Listen (false);
UDP_CloseSocket (UDP_GetControlSocket());
}
//=============================================================================
void UDP_Listen (qboolean state)
{
// enable listening
if (state)
{
if (net_acceptsocket != -1)
return;
if ((net_acceptsocket = UDP_OpenSocket (net_hostport)) == -1)
Sys_Error ("UDP_Listen: Unable to open accept socket\n");
return;
}
// disable listening
if (net_acceptsocket == -1)
return;
UDP_CloseSocket (net_acceptsocket);
net_acceptsocket = -1;
}
//=============================================================================
int UDP_OpenSocket (int port)
{
int newsocket;
struct sockaddr_in address;
qboolean _true = true;
if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
return -1;
if (ioctl (newsocket, FIONBIO, (char *)&_true) == -1)
goto ErrorReturn;
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(port);
if( bind (newsocket, (void *)&address, sizeof(address)) == -1)
goto ErrorReturn;
return newsocket;
ErrorReturn:
close (newsocket);
return -1;
}
//=============================================================================
int UDP_CloseSocket (int socket)
{
if (socket == net_broadcastsocket)
net_broadcastsocket = 0;
return close (socket);
}
//=============================================================================
/*
============
PartialIPAddress
this lets you type only as much of the net address as required, using
the local network components to fill in the rest
============
*/
static int PartialIPAddress (char *in, struct qsockaddr *hostaddr)
{
char buff[256];
char *b;
int addr;
int num;
int mask;
int run;
int port;
buff[0] = '.';
b = buff;
strcpy(buff+1, in);
if (buff[1] == '.')
b++;
addr = 0;
mask=-1;
while (*b == '.')
{
b++;
num = 0;
run = 0;
while (!( *b < '0' || *b > '9'))
{
num = num*10 + *b++ - '0';
if (++run > 3)
return -1;
}
if ((*b < '0' || *b > '9') && *b != '.' && *b != ':' && *b != 0)
return -1;
if (num < 0 || num > 255)
return -1;
mask<<=8;
addr = (addr<<8) + num;
}
if (*b++ == ':')
port = Q_atoi(b);
else
port = net_hostport;
hostaddr->sa_family = AF_INET;
((struct sockaddr_in *)hostaddr)->sin_port = htons((short)port);
((struct sockaddr_in *)hostaddr)->sin_addr.s_addr = (UDP_GetMyAddr() & htonl(mask)) | htonl(addr);
return 0;
}
//=============================================================================
int UDP_Connect (int socket, struct qsockaddr *addr)
{
return 0;
}
//=============================================================================
int UDP_CheckNewConnections (void)
{
unsigned long available;
if (net_acceptsocket == -1)
return -1;
if (ioctl (net_acceptsocket, FIONREAD, &available) == -1)
Sys_Error ("UDP: ioctlsocket (FIONREAD) failed\n");
if (available)
return net_acceptsocket;
return -1;
}
//=============================================================================
int UDP_Read (int socket, byte *buf, int len, struct qsockaddr *addr)
{
socklen_t addrlen = sizeof (struct qsockaddr);
int ret;
ret = recvfrom (socket, buf, len, 0, (struct sockaddr *)addr, &addrlen);
if (ret == -1)
{
int lastError = errno;
if (lastError == EWOULDBLOCK || lastError == ECONNREFUSED)
{
return 0;
}
}
return ret;
}
//=============================================================================
int UDP_MakeSocketBroadcastCapable (int socket)
{
int i = 1;
// make this socket broadcast capable
if (setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i)) < 0)
return -1;
net_broadcastsocket = socket;
return 0;
}
//=============================================================================
int UDP_Broadcast (int socket, byte *buf, int len)
{
int ret;
if (socket != net_broadcastsocket)
{
if (net_broadcastsocket != 0)
Sys_Error("Attempted to use multiple broadcasts sockets\n");
ret = UDP_MakeSocketBroadcastCapable (socket);
if (ret == -1)
{
Con_Printf("Unable to make socket broadcast capable\n");
return ret;
}
}
return UDP_Write (socket, buf, len, UDP_GetBroadcastAddr());
}
//=============================================================================
int UDP_Write (int socket, byte *buf, int len, const struct qsockaddr *addr)
{
int ret;
ret = sendto (socket, buf, len, 0, (const struct sockaddr *)addr, sizeof(struct qsockaddr));
if (ret == -1 && errno == EWOULDBLOCK)
return 0;
return ret;
}
//=============================================================================
char *UDP_AddrToString (struct qsockaddr *addr)
{
static char buffer[22];
int haddr;
haddr = ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr);
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));
return buffer;
}
//=============================================================================
int UDP_StringToAddr (char *string, struct qsockaddr *addr)
{
int ha1, ha2, ha3, ha4, hp;
int ipaddr;
sscanf(string, "%d.%d.%d.%d:%d", &ha1, &ha2, &ha3, &ha4, &hp);
ipaddr = (ha1 << 24) | (ha2 << 16) | (ha3 << 8) | ha4;
addr->sa_family = AF_INET;
((struct sockaddr_in *)addr)->sin_addr.s_addr = htonl(ipaddr);
((struct sockaddr_in *)addr)->sin_port = htons(hp);
return 0;
}
//=============================================================================
int UDP_GetSocketAddr (int socket, struct qsockaddr *addr)
{
socklen_t addrlen = sizeof(struct qsockaddr);
unsigned int a;
Q_memset(addr, 0, sizeof(struct qsockaddr));
getsockname(socket, (struct sockaddr *)addr, &addrlen);
a = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
if (a == 0 || a == inet_addr("127.0.0.1"))
((struct sockaddr_in *)addr)->sin_addr.s_addr = UDP_GetMyAddr();
return 0;
}
//=============================================================================
int UDP_GetNameFromAddr (struct qsockaddr *addr, char *name)
{
struct hostent *hostentry;
hostentry = gethostbyaddr ((char *)&((struct sockaddr_in *)addr)->sin_addr, sizeof(struct in_addr), AF_INET);
if (hostentry)
{
Q_strncpy (name, (char *)hostentry->h_name, NET_NAMELEN - 1);
return 0;
}
Q_strcpy (name, UDP_AddrToString (addr));
return 0;
}
//=============================================================================
int UDP_GetAddrFromName(char *name, struct qsockaddr *addr)
{
struct hostent *hostentry;
if (name[0] >= '0' && name[0] <= '9')
return PartialIPAddress (name, addr);
hostentry = gethostbyname (name);
if (!hostentry)
return -1;
addr->sa_family = AF_INET;
((struct sockaddr_in *)addr)->sin_port = htons(net_hostport);
((struct sockaddr_in *)addr)->sin_addr.s_addr = *(int *)hostentry->h_addr_list[0];
return 0;
}
//=============================================================================
int UDP_AddrCompare (struct qsockaddr *addr1, struct qsockaddr *addr2)
{
/* kja: recvfrom doesn't seem to correctly fill the sa_family field of the recieved address?
if (addr1->sa_family != addr2->sa_family)
return -1;*/
if (((struct sockaddr_in *)addr1)->sin_addr.s_addr != ((struct sockaddr_in *)addr2)->sin_addr.s_addr)
return -1;
if (((struct sockaddr_in *)addr1)->sin_port != ((struct sockaddr_in *)addr2)->sin_port)
return 1;
return 0;
}
//=============================================================================
int UDP_GetSocketPort (struct qsockaddr *addr)
{
return ntohs(((struct sockaddr_in *)addr)->sin_port);
}
int UDP_SetSocketPort (struct qsockaddr *addr, int port)
{
((struct sockaddr_in *)addr)->sin_port = htons(port);
return 0;
}
//=============================================================================