-
Notifications
You must be signed in to change notification settings - Fork 0
/
netop.c
528 lines (436 loc) · 13.5 KB
/
netop.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
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
/* @(#) implementation of network operations for udpxy
*
* Copyright 2008-2011 Pavel V. Cherenkov (pcherenkov@gmail.com)
*
* This file is part of udpxy.
*
* udpxy 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 3 of the License, or
* (at your option) any later version.
*
* udpxy 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 udpxy. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include "udpxy.h"
#include "netop.h"
#include "util.h"
#include "mtrace.h"
#include "osdef.h"
extern FILE* g_flog; /* application log */
/* set up (server) listening sockfd
*/
int
setup_listener( const char* ipaddr, int port, int* sockfd, int bklog )
{
#define LOWMARK 10 /* do not accept input of less than X octets */
int rc, lsock, wmark = LOWMARK;
struct sockaddr_in servaddr;
const int ON = 1;
extern const char IPv4_ALL[];
assert( (port > 0) && sockfd && ipaddr );
(void)IPv4_ALL;
TRACE( (void)tmfprintf( g_flog, "Setting up listener for [%s:%d]\n",
ipaddr[0] ? ipaddr : IPv4_ALL, port) );
rc = ERR_INTERNAL;
do {
lsock = socket( AF_INET, SOCK_STREAM, 0 );
if( -1 == lsock ) break;
(void) memset( &servaddr, 0, sizeof(servaddr) );
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons( (short)port );
if( '\0' != ipaddr[0] ) {
if( 1 != inet_aton(ipaddr, &servaddr.sin_addr) ) {
TRACE( (void)tmfprintf( g_flog, "Invalid server IP: [%s]\n",
ipaddr) );
rc = ERR_PARAM;
break;
}
}
else {
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
}
rc = setsockopt( lsock, SOL_SOCKET, SO_REUSEADDR,
&ON, sizeof(ON) );
if( 0 != rc ) {
mperror(g_flog, errno, "%s: setsockopt SO_REUSEADDR",
__func__);
break;
}
#define NONBLOCK 1
rc = set_nblock (lsock, NONBLOCK);
if (0 != rc) break;
TRACE( (void)tmfprintf (g_flog, "Setting low watermark for "
"server socket [%d] to [%d]\n", lsock, wmark) );
rc = setsockopt (lsock, SOL_SOCKET, SO_RCVLOWAT,
(char*)&wmark, sizeof(wmark));
if (rc) {
mperror (g_flog, errno, "%s: setsockopt SO_RCVLOWAT",
__func__);
break;
}
rc = bind( lsock, (struct sockaddr*)&servaddr, sizeof(servaddr) );
if( 0 != rc ) break;
rc = listen (lsock, (bklog > 0 ? bklog : 1));
if( 0 != rc ) break;
rc = 0;
} while(0);
if( 0 != rc ) {
if(errno)
mperror(g_flog, errno, "%s: socket/bind/listen error",
__func__);
if( lsock ) {
(void) close( lsock );
}
}
else {
*sockfd = lsock;
TRACE( (void)tmfprintf( g_flog, "Created server socket=[%d], backlog=[%d]\n",
lsock, bklog) );
}
return rc;
}
/* add or drop membership in a multicast group
*/
int
set_multicast( int msockfd, const struct in_addr* mifaddr,
int opname )
{
struct sockaddr_in addr;
a_socklen_t len = sizeof(addr);
struct ip_mreq mreq;
int rc = 0;
const char *opstr =
((IP_DROP_MEMBERSHIP == opname) ? "DROP" :
((IP_ADD_MEMBERSHIP == opname) ? "ADD" : ""));
assert( opstr[0] );
assert( (msockfd > 0) && mifaddr );
(void) memset( &mreq, 0, sizeof(mreq) );
(void) memcpy( &mreq.imr_interface, mifaddr,
sizeof(struct in_addr) );
(void) memset( &addr, 0, sizeof(addr) );
rc = getsockname( msockfd, (struct sockaddr*)&addr, &len );
if( 0 != rc ) {
mperror( g_flog, errno, "%s: getsockname", __func__ );
return -1;
}
(void) memcpy( &mreq.imr_multiaddr, &addr.sin_addr,
sizeof(struct in_addr) );
rc = setsockopt( msockfd, IPPROTO_IP, opname,
&mreq, sizeof(mreq) );
if( 0 != rc ) {
mperror( g_flog, errno, "%s: setsockopt MCAST option: %s",
__func__, opstr );
return rc;
}
TRACE( (void)tmfprintf( g_flog, "multicast-group [%s]\n",
opstr ) );
return rc;
}
/* set up the socket to receive multicast data
*
*/
/*jivco*/
int
setup_mcast_listener( struct sockaddr_in* sa,
const struct in_addr* mifaddr,
int* mcastfd,
int sockbuflen )
{
int sockfd, rc;
int ON = 1;
int buflen = sockbuflen;
size_t rcvbuf_len = 0;
assert( sa && mifaddr && mcastfd && (sockbuflen >= 0) );
TRACE( (void)tmfprintf( g_flog, "Setting up multicast listener\n") );
rc = ERR_INTERNAL;
do {
sockfd = socket( AF_INET, SOCK_DGRAM, 0 );
if( -1 == sockfd ) {
mperror(g_flog, errno, "%s: socket", __func__);
break;
}
if (buflen != 0) {
rc = get_rcvbuf( sockfd, &rcvbuf_len );
if (0 != rc) break;
if ((size_t)buflen > rcvbuf_len) {
rc = set_rcvbuf( sockfd, buflen );
if (0 != rc) break;
}
}
else {
TRACE( (void)tmfprintf( g_flog, "Must not adjust buffer size "
"for mcast socket [%d]\n", sockfd ) );
}
rc = setsockopt( sockfd, SOL_SOCKET, SO_REUSEADDR,
&ON, sizeof(ON) );
if( 0 != rc ) {
mperror(g_flog, errno, "%s: setsockopt SO_REUSEADDR",
__func__);
break;
}
#ifdef SO_REUSEPORT
/* On some systems (such as FreeBSD) SO_REUSEADDR
just isn't enough to subscribe to N same channels for different clients.
*/
rc = setsockopt( sockfd, SOL_SOCKET, SO_REUSEPORT,
&ON, sizeof(ON) );
if( 0 != rc ) {
mperror(g_flog, errno, "%s: setsockopt SO_REUSEPORT",
__func__);
break;
}
#endif /* SO_REUSEPORT */
rc = bind( sockfd, (struct sockaddr*)sa, sizeof(*sa) );
if( 0 != rc ) {
mperror(g_flog, errno, "%s: bind", __func__);
break;
}
rc = set_multicast( sockfd, mifaddr, IP_ADD_MEMBERSHIP );
if( 0 != rc )
break;
} while(0);
if( 0 == rc ) {
*mcastfd = sockfd;
TRACE( (void)tmfprintf( g_flog, "Mcast listener socket=[%d] set up\n",
sockfd) );
}
else {
(void)close(sockfd);
}
return rc;
}
/* unsubscribe from multicast and close the reader socket
*/
void
close_mcast_listener( int msockfd, const struct in_addr* mifaddr )
{
assert( mifaddr );
if( msockfd <= 0 ) return;
(void) set_multicast( msockfd, mifaddr, IP_DROP_MEMBERSHIP );
(void) close( msockfd );
TRACE( (void)tmfprintf( g_flog, "Mcast listener socket=[%d] closed\n",
msockfd) );
return;
}
/* drop from and add into a multicast group
*/
int
renew_multicast( int msockfd, const struct in_addr* mifaddr )
{
int rc = 0;
rc = set_multicast( msockfd, mifaddr, IP_DROP_MEMBERSHIP );
if( 0 != rc ) return rc;
rc = set_multicast( msockfd, mifaddr, IP_ADD_MEMBERSHIP );
return rc;
}
/* set send/receive timeouts on socket(s)
*/
int
set_timeouts( int rsock, int ssock,
u_short rcv_tmout_sec, u_short rcv_tmout_usec,
u_short snd_tmout_sec, u_short snd_tmout_usec )
{
struct timeval rtv, stv;
int rc = 0;
if( rsock ) {
rtv.tv_sec = rcv_tmout_sec;
rtv.tv_usec = rcv_tmout_usec;
rc = setsockopt( rsock, SOL_SOCKET, SO_RCVTIMEO, &rtv, sizeof(rtv) );
if( -1 == rc ) {
mperror(g_flog, errno, "%s: setsockopt - SO_RCVTIMEO",
__func__);
return ERR_INTERNAL;
}
TRACE( (void)tmfprintf (g_flog, "socket %d: RCV timeout set to %ld sec, %ld usec\n",
rsock, rtv.tv_sec, rtv.tv_usec) );
}
if( ssock ) {
stv.tv_sec = snd_tmout_sec;
stv.tv_usec = snd_tmout_usec;
rc = setsockopt( ssock, SOL_SOCKET, SO_SNDTIMEO, &stv, sizeof(stv) );
if( -1 == rc ) {
mperror(g_flog, errno, "%s: setsockopt - SO_SNDTIMEO", __func__);
return ERR_INTERNAL;
}
TRACE( (void)tmfprintf (g_flog, "socket %d: SEND timeout set to %ld sec, %ld usec\n",
rsock, rtv.tv_sec, rtv.tv_usec) );
}
return rc;
}
/* set socket's send/receive buffer size
*/
static int
set_sockbuf_size( int sockfd, int option, const size_t len,
const char* bufname )
{
size_t data_len = len;
int rc = 0;
assert( bufname );
rc = setsockopt( sockfd, SOL_SOCKET, option,
&data_len, sizeof(data_len) );
if( 0 != rc ) {
mperror(g_flog, errno, "%s: setsockopt %s [%d]",
__func__, bufname, option);
return -1;
}
else {
TRACE( (void)tmfprintf( g_flog,
"%s buffer size set to [%u] bytes for socket [%d]\n",
bufname, data_len, sockfd ) );
}
return rc;
}
/* set socket's send buffer value
*/
int
set_sendbuf( int sockfd, const size_t len )
{
return set_sockbuf_size( sockfd, SO_SNDBUF, len, "send" );
}
/* set socket's receive buffer value
*/
int
set_rcvbuf( int sockfd, const size_t len )
{
return set_sockbuf_size( sockfd, SO_RCVBUF, len, "receive" );
}
static int
get_sockbuf_size( int sockfd, int option, size_t* const len,
const char* bufname )
{
int rc = 0;
size_t buflen = 0;
socklen_t varsz = sizeof(buflen);
assert( sockfd && len && bufname );
rc = getsockopt( sockfd, SOL_SOCKET, option, &buflen, &varsz );
if (0 != rc) {
mperror( g_flog, errno, "%s: getsockopt (%s) [%d]", __func__,
bufname, option);
return -1;
}
else {
TRACE( (void)tmfprintf( g_flog,
"current %s buffer size is [%u] bytes for socket [%d]\n",
bufname, buflen, sockfd ) );
*len = buflen;
}
return rc;
}
/* get socket's send buffer size
*/
int
get_sendbuf( int sockfd, size_t* const len )
{
return get_sockbuf_size( sockfd, SO_SNDBUF, len, "send" );
}
/* get socket's receive buffer size
*/
int
get_rcvbuf( int sockfd, size_t* const len )
{
return get_sockbuf_size( sockfd, SO_RCVBUF, len, "receive" );
}
/* set/clear file/socket's mode as non-blocking
*/
int
set_nblock( int fd, int set )
{
int flags = 0;
flags = fcntl( fd, F_GETFL, 0 );
if( flags < 0 ) {
mperror( g_flog, errno, "%s: fcntl() getting flags on fd=[%d]",
__func__, fd );
return -1;
}
if( set )
flags |= O_NONBLOCK;
else
flags &= ~O_NONBLOCK;
if( fcntl( fd, F_SETFL, flags ) < 0 ) {
mperror( g_flog, errno, "%s: fcntl() %s non-blocking mode "
"on fd=[%d]", __func__, (set ? "setting" : "clearing"),
fd );
return -1;
}
return 0;
}
static int
sock_info (int peer, int sockfd, char* addr, size_t alen, int* port)
{
int rc = 0;
union {
struct sockaddr sa;
char data [sizeof(struct sockaddr_in6)];
} gsa;
socklen_t len;
const void* dst = NULL;
struct sockaddr_in6 *sa6 = NULL;
struct sockaddr_in *sa4 = NULL;
len = sizeof (gsa.data);
rc = peer ? getpeername (sockfd, (struct sockaddr*)gsa.data, &len):
getsockname (sockfd, (struct sockaddr*)gsa.data, &len);
if (0 != rc) {
rc = errno;
(void) fprintf (g_flog, "getsockname error [%d]: %s\n",
rc, strerror (rc));
return rc;
}
switch (gsa.sa.sa_family) {
case AF_INET:
sa4 = (struct sockaddr_in*)&gsa.sa;
if (addr) {
dst = inet_ntop (gsa.sa.sa_family, &(sa4->sin_addr),
addr, (socklen_t)alen);
}
if (port) *port = (int) ntohs (sa4->sin_port);
break;
case AF_INET6:
sa6 = (struct sockaddr_in6*)&gsa.sa;
if (addr) {
dst = inet_ntop (gsa.sa.sa_family, &(sa6->sin6_addr),
addr, (socklen_t)alen);
}
if (port) *port = (int) ntohs (sa6->sin6_port);
break;
default:
(void) tmfprintf (g_flog, "%s: unsupported socket family: %d\n",
__func__, (int)gsa.sa.sa_family);
return EAFNOSUPPORT;
}
if (addr && !dst) {
rc = errno;
(void) tmfprintf (g_flog, "%s: inet_pton error [%d]: %s\n",
__func__, rc, strerror (rc));
return rc;
}
return rc;
}
enum {e_host = 0, e_peer = 1};
int
get_sockinfo (int sockfd, char* addr, size_t alen, int* port)
{
return sock_info (e_host, sockfd, addr, alen, port);
}
int
get_peerinfo (int sockfd, char* addr, size_t alen, int* port)
{
return sock_info (e_peer, sockfd, addr, alen, port);
}
/* __EOF__ */