aboutsummaryrefslogtreecommitdiffstats
path: root/src/plugins/hs_apps/vcl/sock_test_server.c
blob: bd777ccb91733ee20fee70bc2c5b436ac50e0fb1 (plain)
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
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
/*
 * Copyright (c) 2017-2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#include <hs_apps/vcl/sock_test.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>

#define SOCK_SERVER_USE_EPOLL 1
#define VPPCOM_SESSION_ATTR_UNIT_TEST 0

#if SOCK_SERVER_USE_EPOLL
#include <sys/epoll.h>
#if !defined(VCL_TEST)
#include <sys/un.h>
#endif
#endif

#ifdef VCL_TEST
#if VPPCOM_SESSION_ATTR_UNIT_TEST
#define BUFLEN  sizeof (uint64_t) * 16
uint64_t buffer[16];
uint32_t buflen = BUFLEN;
uint32_t *flags = (uint32_t *) buffer;
#endif
#endif

typedef struct
{
  uint8_t is_alloc;
  int fd;
  uint8_t *buf;
  uint32_t buf_size;
  vcl_test_cfg_t cfg;
  vcl_test_stats_t stats;
#ifdef VCL_TEST
  vppcom_endpt_t endpt;
  uint8_t ip[16];
#endif
} sock_server_conn_t;

typedef struct
{
  uint32_t port;
  uint32_t address_ip6;
  uint32_t transport_udp;
} sock_server_cfg_t;

#define SOCK_SERVER_MAX_TEST_CONN  10
#define SOCK_SERVER_MAX_EPOLL_EVENTS 10
typedef struct
{
  int listen_fd;
  sock_server_cfg_t cfg;
#if SOCK_SERVER_USE_EPOLL
  int epfd;
  struct epoll_event listen_ev;
  struct epoll_event wait_events[SOCK_SERVER_MAX_EPOLL_EVENTS];
#if !defined (VCL_TEST)
  int af_unix_listen_fd;
  int af_unix_fd;
  struct epoll_event af_unix_listen_ev;
  struct sockaddr_un serveraddr;
  uint32_t af_unix_xacts;
#endif
#endif
  size_t num_conn;
  size_t conn_pool_size;
  sock_server_conn_t *conn_pool;
  int nfds;
  fd_set rd_fdset;
  fd_set wr_fdset;
  struct timeval timeout;
} sock_server_main_t;

sock_server_main_t sock_server_main;

#if ! SOCK_SERVER_USE_EPOLL
static inline int
get_nfds (void)
{
  sock_server_main_t *ssm = &sock_server_main;
  int i, nfds;

  for (nfds = i = 0; i < FD_SETSIZE; i++)
    {
      if (FD_ISSET (i, &ssm->rd_fdset) || FD_ISSET (i, &ssm->wr_fdset))
	nfds = i + 1;
    }
  return nfds;
}

static inline void
conn_fdset_set (sock_server_conn_t * conn, fd_set * fdset)
{
  sock_server_main_t *ssm = &sock_server_main;

  FD_SET (conn->fd, fdset);
  ssm->nfds = get_nfds ();
}

static inline void
conn_fdset_clr (sock_server_conn_t * conn, fd_set * fdset)
{
  sock_server_main_t *ssm = &sock_server_main;

  FD_CLR (conn->fd, fdset);
  ssm->nfds = get_nfds ();
}
#endif

static inline void
conn_pool_expand (size_t expand_size)
{
  sock_server_main_t *ssm = &sock_server_main;
  sock_server_conn_t *conn_pool;
  size_t new_size = ssm->conn_pool_size + expand_size;
  int i;

  conn_pool = realloc (ssm->conn_pool, new_size * sizeof (*ssm->conn_pool));
  if (conn_pool)
    {
      for (i = ssm->conn_pool_size; i < new_size; i++)
	{
	  sock_server_conn_t *conn = &conn_pool[i];
	  memset (conn, 0, sizeof (*conn));
	  vcl_test_cfg_init (&conn->cfg);
	  vcl_test_buf_alloc (&conn->cfg, 1 /* is_rxbuf */ ,
			      &conn->buf, &conn->buf_size);
	  conn->cfg.txbuf_size = conn->cfg.rxbuf_size;
	}

      ssm->conn_pool = conn_pool;
      ssm->conn_pool_size = new_size;
    }
  else
    {
      int errno_val = errno;
      perror ("ERROR in conn_pool_expand()");
      fprintf (stderr, "SERVER: ERROR: Memory allocation "
	       "failed (errno = %d)!\n", errno_val);
    }
}

static inline sock_server_conn_t *
conn_pool_alloc (void)
{
  sock_server_main_t *ssm = &sock_server_main;
  int i;

  for (i = 0; i < ssm->conn_pool_size; i++)
    {
      if (!ssm->conn_pool[i].is_alloc)
	{
#ifdef VCL_TEST
	  ssm->conn_pool[i].endpt.ip = ssm->conn_pool[i].ip;
#endif
	  ssm->conn_pool[i].is_alloc = 1;
	  return (&ssm->conn_pool[i]);
	}
    }

  return 0;
}

static inline void
conn_pool_free (sock_server_conn_t * conn)
{
#if ! SOCK_SERVER_USE_EPOLL
  sock_server_main_t *ssm = &sock_server_main;

  conn_fdset_clr (conn, &ssm->rd_fdset);
  conn_fdset_clr (conn, &ssm->wr_fdset);
#endif
  conn->fd = 0;
  conn->is_alloc = 0;
}

static inline void
sync_config_and_reply (sock_server_conn_t * conn, vcl_test_cfg_t * rx_cfg)
{
  conn->cfg = *rx_cfg;
  vcl_test_buf_alloc (&conn->cfg, 1 /* is_rxbuf */ ,
		      &conn->buf, &conn->buf_size);
  conn->cfg.txbuf_size = conn->cfg.rxbuf_size;

  if (conn->cfg.verbose)
    {
      printf ("\nSERVER (fd %d): Replying to cfg message!\n", conn->fd);
      vcl_test_cfg_dump (&conn->cfg, 0 /* is_client */ );
    }
  (void) sock_test_write (conn->fd, (uint8_t *) & conn->cfg,
			  sizeof (conn->cfg), NULL, conn->cfg.verbose);
}

static void
stream_test_server_start_stop (sock_server_conn_t * conn,
			       vcl_test_cfg_t * rx_cfg)
{
  sock_server_main_t *ssm = &sock_server_main;
  int client_fd = conn->fd;
  vcl_test_t test = rx_cfg->test;

  if (rx_cfg->ctrl_handle == conn->fd)
    {
      int i;
      clock_gettime (CLOCK_REALTIME, &conn->stats.stop);

      for (i = 0; i < ssm->conn_pool_size; i++)
	{
	  sock_server_conn_t *tc = &ssm->conn_pool[i];

	  if (tc->cfg.ctrl_handle == conn->fd)
	    {
	      vcl_test_stats_accumulate (&conn->stats, &tc->stats);

	      if (conn->cfg.verbose)
		{
		  static char buf[64];

		  snprintf (buf, sizeof (buf), "SERVER (fd %d) RESULTS",
			    tc->fd);
		  vcl_test_stats_dump (buf, &tc->stats, 1 /* show_rx */ ,
				       test == VCL_TEST_TYPE_BI
				       /* show tx */ ,
				       conn->cfg.verbose);
		}
	    }
	}

      vcl_test_stats_dump ("SERVER RESULTS", &conn->stats, 1 /* show_rx */ ,
			   (test == VCL_TEST_TYPE_BI) /* show_tx */ ,
			   conn->cfg.verbose);
      vcl_test_cfg_dump (&conn->cfg, 0 /* is_client */ );
      if (conn->cfg.verbose)
	{
	  printf ("  sock server main\n"
		  VCL_TEST_SEPARATOR_STRING
		  "       buf:  %p\n"
		  "  buf size:  %u (0x%08x)\n"
		  VCL_TEST_SEPARATOR_STRING,
		  conn->buf, conn->buf_size, conn->buf_size);
	}

      sync_config_and_reply (conn, rx_cfg);
      printf ("\nSERVER (fd %d): %s-directional Stream Test Complete!\n"
	      SOCK_TEST_BANNER_STRING "\n", conn->fd,
	      test == VCL_TEST_TYPE_BI ? "Bi" : "Uni");
    }
  else
    {
      printf ("\n" SOCK_TEST_BANNER_STRING
	      "SERVER (fd %d): %s-directional Stream Test!\n"
	      "  Sending client the test cfg to start streaming data...\n",
	      client_fd, test == VCL_TEST_TYPE_BI ? "Bi" : "Uni");

      rx_cfg->ctrl_handle = (rx_cfg->ctrl_handle == ~0) ? conn->fd :
	rx_cfg->ctrl_handle;

      sync_config_and_reply (conn, rx_cfg);

      /* read the 1st chunk, record start time */
      memset (&conn->stats, 0, sizeof (conn->stats));
      clock_gettime (CLOCK_REALTIME, &conn->stats.start);
    }
}


static inline void
stream_test_server (sock_server_conn_t * conn, int rx_bytes)
{
  int client_fd = conn->fd;
  vcl_test_t test = conn->cfg.test;

  if (test == VCL_TEST_TYPE_BI)
    (void) sock_test_write (client_fd, conn->buf, rx_bytes, &conn->stats,
			    conn->cfg.verbose);

  if (conn->stats.rx_bytes >= conn->cfg.total_bytes)
    {
      clock_gettime (CLOCK_REALTIME, &conn->stats.stop);
    }
}

#if SOCK_SERVER_USE_EPOLL && !defined (VCL_TEST)
static inline void
af_unix_echo (void)
{
  sock_server_main_t *ssm = &sock_server_main;
  int af_unix_client_fd;
  int rv;
  int errno_val;
  uint8_t buffer[256];
  size_t nbytes = strlen (SOCK_TEST_MIXED_EPOLL_DATA) + 1;

#if HAVE_ACCEPT4
  af_unix_client_fd = accept4 (ssm->af_unix_listen_fd,
			       (struct sockaddr *) NULL, NULL, NULL);
#else
  af_unix_client_fd = accept (ssm->af_unix_listen_fd,
			      (struct sockaddr *) NULL, NULL);
#endif
  if (af_unix_client_fd < 0)
    {
      errno_val = errno;
      perror ("ERROR in af_unix_accept()");
      fprintf (stderr, "SERVER: ERROR: accept failed "
	       "(errno = %d)!\n", errno_val);
      return;
    }

  printf ("SERVER: Got an AF_UNIX connection -- fd = %d (0x%08x)!\n",
	  af_unix_client_fd, af_unix_client_fd);

  memset (buffer, 0, sizeof (buffer));

  rv = read (af_unix_client_fd, buffer, nbytes);
  if (rv < 0)
    {
      errno_val = errno;
      perror ("ERROR in af_unix_echo(): read() failed");
      fprintf (stderr, "SERVER: ERROR: read(af_unix_client_fd %d (0x%x), "
	       "nbytes %lu) failed (errno = %d)!\n", af_unix_client_fd,
	       af_unix_client_fd, nbytes, errno_val);
      goto done;
    }
  /* Make the buffer is NULL-terminated. */
  buffer[sizeof (buffer) - 1] = 0;
  printf ("SERVER (AF_UNIX): RX (%d bytes) - '%s'\n", rv, buffer);

  if (!strncmp (SOCK_TEST_MIXED_EPOLL_DATA, (const char *) buffer, nbytes))
    {
      rv = write (af_unix_client_fd, buffer, nbytes);
      if (rv < 0)
	{
	  errno_val = errno;
	  perror ("ERROR in af_unix_echo(): write() failed");
	  fprintf (stderr,
		   "SERVER: ERROR: write(af_unix_client_fd %d (0x%x), "
		   "\"%s\", nbytes %ld) failed (errno = %d)!\n",
		   af_unix_client_fd, af_unix_client_fd, buffer, nbytes,
		   errno_val);
	  goto done;
	}
      printf ("SERVER (AF_UNIX): TX (%d bytes) - '%s'\n", rv, buffer);
      ssm->af_unix_xacts++;
    }
done:
  close (af_unix_client_fd);
}

#endif

static inline void
new_client (void)
{
  sock_server_main_t *ssm = &sock_server_main;
  int client_fd;
  sock_server_conn_t *conn;

  if (ssm->conn_pool_size < (ssm->num_conn + SOCK_SERVER_MAX_TEST_CONN + 1))
    conn_pool_expand (SOCK_SERVER_MAX_TEST_CONN + 1);

  conn = conn_pool_alloc ();
  if (!conn)
    {
      fprintf (stderr, "\nSERVER: ERROR: No free connections!\n");
      return;
    }

#ifdef VCL_TEST
  client_fd = vppcom_session_accept (ssm->listen_fd, &conn->endpt, 0);
  if (client_fd < 0)
    errno = -client_fd;
#elif HAVE_ACCEPT4
  client_fd = accept4 (ssm->listen_fd, (struct sockaddr *) NULL, NULL, NULL);
#else
  client_fd = accept (ssm->listen_fd, (struct sockaddr *) NULL, NULL);
#endif
  if (client_fd < 0)
    {
      int errno_val;
      errno_val = errno;
      perror ("ERROR in new_client()");
      fprintf (stderr, "SERVER: ERROR: accept failed "
	       "(errno = %d)!\n", errno_val);
      return;
    }

  printf ("SERVER: Got a connection -- fd = %d (0x%08x)!\n",
	  client_fd, client_fd);

  conn->fd = client_fd;

#if ! SOCK_SERVER_USE_EPOLL
  conn_fdset_set (conn, &ssm->rd_fdset);
  ssm->nfds++;
#else
  {
    struct epoll_event ev;
    int rv;

    ev.events = EPOLLIN;
    ev.data.u64 = conn - ssm->conn_pool;
#ifdef VCL_TEST
    rv = vppcom_epoll_ctl (ssm->epfd, EPOLL_CTL_ADD, client_fd, &ev);
    if (rv)
      errno = -rv;
#else
    rv = epoll_ctl (ssm->epfd, EPOLL_CTL_ADD, client_fd, &ev);
#endif
    if (rv < 0)
      {
	int errno_val;
	errno_val = errno;
	perror ("ERROR in new_client()");
	fprintf (stderr, "SERVER: ERROR: epoll_ctl failed (errno = %d)!\n",
		 errno_val);
      }
    else
      ssm->nfds++;
  }
#endif
}

void
print_usage_and_exit (void)
{
  fprintf (stderr,
	   "sock_test_server [OPTIONS] <port>\n"
	   "  OPTIONS\n"
	   "  -h               Print this message and exit.\n"
	   "  -6               Use IPv6\n"
	   "  -u               Use UDP transport layer\n");
  exit (1);
}

int
main (int argc, char **argv)
{
  sock_server_main_t *ssm = &sock_server_main;
  int client_fd, rv, main_rv = 0;
  int tx_bytes, rx_bytes, nbytes;
  sock_server_conn_t *conn;
  vcl_test_cfg_t *rx_cfg;
  uint32_t xtra = 0;
  uint64_t xtra_bytes = 0;
  struct sockaddr_storage servaddr;
  int errno_val;
  int c, v, i;
  uint16_t port = VCL_TEST_SERVER_PORT;
#if ! SOCK_SERVER_USE_EPOLL
  fd_set _rfdset, *rfdset = &_rfdset;
#endif
#ifdef VCL_TEST
  vppcom_endpt_t endpt;
#else
  uint32_t servaddr_size;
#if ! SOCK_SERVER_USE_EPOLL
  fd_set _wfdset, *wfdset = &_wfdset;
#endif
#endif

  opterr = 0;
  while ((c = getopt (argc, argv, "6D")) != -1)
    switch (c)
      {
      case '6':
	ssm->cfg.address_ip6 = 1;
	break;

      case 'D':
	ssm->cfg.transport_udp = 1;
	break;

      case '?':
	switch (optopt)
	  {
	  default:
	    if (isprint (optopt))
	      fprintf (stderr, "SERVER: ERROR: Unknown "
		       "option `-%c'.\n", optopt);
	    else
	      fprintf (stderr, "SERVER: ERROR: Unknown "
		       "option character `\\x%x'.\n", optopt);
	  }
	/* fall thru */
      case 'h':
      default:
	print_usage_and_exit ();
      }

  if (argc < (optind + 1))
    {
      fprintf (stderr, "SERVER: ERROR: Insufficient number of arguments!\n");
      print_usage_and_exit ();
    }

  if (sscanf (argv[optind], "%d", &v) == 1)
    port = (uint16_t) v;
  else
    {
      fprintf (stderr, "SERVER: ERROR: Invalid port (%s)!\n", argv[optind]);
      print_usage_and_exit ();
    }

  conn_pool_expand (SOCK_SERVER_MAX_TEST_CONN + 1);

#ifdef VCL_TEST
  rv = vppcom_app_create ("vcl_test_server");
  if (rv)
    {
      errno = -rv;
      ssm->listen_fd = -1;
    }
  else
    {
      ssm->listen_fd = vppcom_session_create (ssm->cfg.transport_udp ?
					      VPPCOM_PROTO_UDP :
					      VPPCOM_PROTO_TCP,
					      0 /* is_nonblocking */ );
    }
#else
  ssm->listen_fd = socket (ssm->cfg.address_ip6 ? AF_INET6 : AF_INET,
			   ssm->cfg.transport_udp ? SOCK_DGRAM : SOCK_STREAM,
			   0);
#if SOCK_SERVER_USE_EPOLL && !defined (VCL_TEST)
  unlink ((const char *) SOCK_TEST_AF_UNIX_FILENAME);
  ssm->af_unix_listen_fd = socket (AF_UNIX, SOCK_STREAM, 0);
  if (ssm->af_unix_listen_fd < 0)
    {
      errno_val = errno;
      perror ("ERROR in main(): socket(AF_UNIX) failed");
      fprintf (stderr,
	       "SERVER: ERROR: socket(AF_UNIX, SOCK_STREAM, 0) failed "
	       "(errno = %d)!\n", errno_val);
      return ssm->af_unix_listen_fd;
    }

  memset (&ssm->serveraddr, 0, sizeof (ssm->serveraddr));
  ssm->serveraddr.sun_family = AF_UNIX;
  strcpy (ssm->serveraddr.sun_path, SOCK_TEST_AF_UNIX_FILENAME);

  rv = bind (ssm->af_unix_listen_fd, (struct sockaddr *) &ssm->serveraddr,
	     SUN_LEN (&ssm->serveraddr));
  if (rv < 0)
    {
      errno_val = errno;
      perror ("ERROR in main(): bind(SOCK_TEST_AF_UNIX_FILENAME) failed");
      fprintf (stderr, "SERVER: ERROR: bind() fd %d, \"%s\": "
	       "failed (errno = %d)!\n", ssm->af_unix_listen_fd,
	       SOCK_TEST_AF_UNIX_FILENAME, errno_val);
      close (ssm->af_unix_listen_fd);
      unlink ((const char *) SOCK_TEST_AF_UNIX_FILENAME);
      return rv;
    }

  rv = listen (ssm->af_unix_listen_fd, 10);
  if (rv < 0)
    {
      errno_val = errno;
      perror ("ERROR in main(): listen(AF_UNIX) failed");
      fprintf (stderr, "SERVER: ERROR: listen() fd %d, \"%s\": "
	       "failed (errno = %d)!\n", ssm->af_unix_listen_fd,
	       SOCK_TEST_AF_UNIX_FILENAME, errno_val);
      close (ssm->af_unix_listen_fd);
      unlink ((const char *) SOCK_TEST_AF_UNIX_FILENAME);
      return rv;
    }
#endif /* SOCK_SERVER_USE_EPOLL */
#endif
  if (ssm->listen_fd < 0)
    {
      errno_val = errno;
      perror ("ERROR in main()");
      fprintf (stderr, "SERVER: ERROR: socket() failed "
	       "(errno = %d)!\n", errno_val);
      return ssm->listen_fd;
    }

  memset (&servaddr, 0, sizeof (servaddr));

  if (ssm->cfg.address_ip6)
    {
      struct sockaddr_in6 *server_addr = (struct sockaddr_in6 *) &servaddr;
#ifndef VCL_TEST
      servaddr_size = sizeof (*server_addr);
#endif
      server_addr->sin6_family = AF_INET6;
      server_addr->sin6_addr = in6addr_any;
      server_addr->sin6_port = htons (port);
    }
  else
    {
      struct sockaddr_in *server_addr = (struct sockaddr_in *) &servaddr;
#ifndef VCL_TEST
      servaddr_size = sizeof (*server_addr);
#endif
      server_addr->sin_family = AF_INET;
      server_addr->sin_addr.s_addr = htonl (INADDR_ANY);
      server_addr->sin_port = htons (port);
    }

#ifdef VCL_TEST
  if (ssm->cfg.address_ip6)
    {
      struct sockaddr_in6 *server_addr = (struct sockaddr_in6 *) &servaddr;
      endpt.is_ip4 = 0;
      endpt.ip = (uint8_t *) & server_addr->sin6_addr;
      endpt.port = (uint16_t) server_addr->sin6_port;
    }
  else
    {
      struct sockaddr_in *server_addr = (struct sockaddr_in *) &servaddr;
      endpt.is_ip4 = 1;
      endpt.ip = (uint8_t *) & server_addr->sin_addr;
      endpt.port = (uint16_t) server_addr->sin_port;
    }

  rv = vppcom_session_bind (ssm->listen_fd, &endpt);
  if (rv)
    {
      errno = -rv;
      rv = -1;
    }
#else
  rv = bind (ssm->listen_fd, (struct sockaddr *) &servaddr, servaddr_size);
#endif
  if (rv < 0)
    {
      errno_val = errno;
      perror ("ERROR in main()");
      fprintf (stderr, "SERVER: ERROR: bind failed (errno = %d)!\n",
	       errno_val);
      return rv;
    }
  if (fcntl (ssm->listen_fd, F_SETFL, O_NONBLOCK) < 0)
    {
      errno_val = errno;
      perror ("ERROR in main()");
      fprintf (stderr, "SERVER: ERROR: fcntl failed (errno = %d)!\n",
	       errno_val);
      return rv;
    }

#ifdef VCL_TEST
  rv = vppcom_session_listen (ssm->listen_fd, 10);
  if (rv)
    {
      errno = -rv;
      rv = -1;
    }
#else
  rv = listen (ssm->listen_fd, 10);
#endif
  if (rv < 0)
    {
      errno_val = errno;
      perror ("ERROR in main()");
      fprintf (stderr, "SERVER: ERROR: listen failed "
	       "(errno = %d)!\n", errno_val);
      return rv;
    }

#if ! SOCK_SERVER_USE_EPOLL

  FD_ZERO (&ssm->wr_fdset);
  FD_ZERO (&ssm->rd_fdset);

  FD_SET (ssm->listen_fd, &ssm->rd_fdset);
  ssm->nfds = ssm->listen_fd + 1;

#else
#ifdef VCL_TEST
  ssm->epfd = vppcom_epoll_create ();
  if (ssm->epfd < 0)
    errno = -ssm->epfd;
#else
  ssm->epfd = epoll_create (1);
#endif
  if (ssm->epfd < 0)
    {
      errno_val = errno;
      perror ("ERROR in main()");
      fprintf (stderr, "SERVER: ERROR: epoll_create failed (errno = %d)!\n",
	       errno_val);
      return ssm->epfd;
    }

  ssm->listen_ev.events = EPOLLIN;
  ssm->listen_ev.data.u32 = ~0;
#ifdef VCL_TEST
  rv = vppcom_epoll_ctl (ssm->epfd, EPOLL_CTL_ADD, ssm->listen_fd,
			 &ssm->listen_ev);
  if (rv < 0)
    errno = -rv;
#else
  ssm->af_unix_listen_ev.events = EPOLLIN;
  ssm->af_unix_listen_ev.data.u32 = SOCK_TEST_AF_UNIX_ACCEPT_DATA;
  rv = epoll_ctl (ssm->epfd, EPOLL_CTL_ADD, ssm->af_unix_listen_fd,
		  &ssm->af_unix_listen_ev);
  if (rv < 0)
    {
      errno_val = errno;
      perror ("ERROR in main(): mixed epoll_ctl(EPOLL_CTL_ADD)");
      fprintf (stderr, "SERVER: ERROR: mixed epoll_ctl(epfd %d (0x%x), "
	       "EPOLL_CTL_ADD, af_unix_listen_fd %d (0x%x), EPOLLIN) failed "
	       "(errno = %d)!\n", ssm->epfd, ssm->epfd,
	       ssm->af_unix_listen_fd, ssm->af_unix_listen_fd, errno_val);
      close (ssm->af_unix_listen_fd);
      unlink ((const char *) SOCK_TEST_AF_UNIX_FILENAME);
      return rv;
    }

  rv = epoll_ctl (ssm->epfd, EPOLL_CTL_ADD, ssm->listen_fd, &ssm->listen_ev);
#endif
  if (rv < 0)
    {
      errno_val = errno;
      perror ("ERROR in main()");
      fprintf (stderr, "SERVER: ERROR: epoll_ctl failed "
	       "(errno = %d)!\n", errno_val);
      return rv;
    }
#endif

  printf ("\nSERVER: Waiting for a client to connect on port %d...\n", port);

  while (1)
    {
#if ! SOCK_SERVER_USE_EPOLL
      _rfdset = ssm->rd_fdset;

#ifdef VCL_TEST
      rv = vppcom_select (ssm->nfds, (unsigned long *) rfdset, NULL, NULL, 0);
#else
      {
	struct timeval timeout;
	timeout = ssm->timeout;
	_wfdset = ssm->wr_fdset;
	rv = select (ssm->nfds, rfdset, wfdset, NULL, &timeout);
      }
#endif
      if (rv < 0)
	{
	  perror ("select()");
	  fprintf (stderr, "\nSERVER: ERROR: select() failed -- aborting!\n");
	  main_rv = -1;
	  goto done;
	}
      else if (rv == 0)
	continue;

      if (FD_ISSET (ssm->listen_fd, rfdset))
	new_client ();

      for (i = 0; i < ssm->conn_pool_size; i++)
	{
	  if (!ssm->conn_pool[i].is_alloc)
	    continue;

	  conn = &ssm->conn_pool[i];
#else
      int num_ev;
#ifdef VCL_TEST
      num_ev = vppcom_epoll_wait (ssm->epfd, ssm->wait_events,
				  SOCK_SERVER_MAX_EPOLL_EVENTS, 60.0);
      if (num_ev < 0)
	errno = -num_ev;
#else
      num_ev = epoll_wait (ssm->epfd, ssm->wait_events,
			   SOCK_SERVER_MAX_EPOLL_EVENTS, 60000);
#endif
      if (num_ev < 0)
	{
	  perror ("epoll_wait()");
	  fprintf (stderr, "\nSERVER: ERROR: epoll_wait() "
		   "failed -- aborting!\n");
	  main_rv = -1;
	  goto done;
	}
      if (num_ev == 0)
	{
	  fprintf (stderr, "\nSERVER: epoll_wait() timeout!\n");
	  continue;
	}
      for (i = 0; i < num_ev; i++)
	{
	  conn = &ssm->conn_pool[ssm->wait_events[i].data.u32];
	  if (ssm->wait_events[i].events & (EPOLLHUP | EPOLLRDHUP))
	    {
#ifdef VCL_TEST
	      vppcom_session_close (conn->fd);
#else
	      close (conn->fd);
#endif
	      continue;
	    }
	  if (ssm->wait_events[i].data.u32 == ~0)
	    {
	      new_client ();
	      continue;
	    }
#if !defined (VCL_TEST)
	  else if (ssm->wait_events[i].data.u32 ==
		   SOCK_TEST_AF_UNIX_ACCEPT_DATA)
	    {
	      af_unix_echo ();
	      continue;
	    }
#endif
#endif
	  client_fd = conn->fd;

#if ! SOCK_SERVER_USE_EPOLL
	  if (FD_ISSET (client_fd, rfdset))
#else
	  if (EPOLLIN & ssm->wait_events[i].events)
#endif
	    {
	    read_again:
	      rx_bytes = sock_test_read (client_fd, conn->buf,
					 conn->buf_size, &conn->stats);
	      if (rx_bytes > 0)
		{
		  rx_cfg = (vcl_test_cfg_t *) conn->buf;
		  if (rx_cfg->magic == VCL_TEST_CFG_CTRL_MAGIC)
		    {
		      if (rx_cfg->verbose)
			{
			  printf ("SERVER (fd %d): Received a cfg message!\n",
				  client_fd);
			  vcl_test_cfg_dump (rx_cfg, 0 /* is_client */ );
			}

		      if (rx_bytes != sizeof (*rx_cfg))
			{
			  printf ("SERVER (fd %d): Invalid cfg message "
				  "size (%d)!\n  Should be %lu bytes.\n",
				  client_fd, rx_bytes, sizeof (*rx_cfg));
			  conn->cfg.rxbuf_size = 0;
			  conn->cfg.num_writes = 0;
			  if (conn->cfg.verbose)
			    {
			      printf ("SERVER (fd %d): Replying to "
				      "cfg message!\n", client_fd);
			      vcl_test_cfg_dump (rx_cfg, 0 /* is_client */ );
			    }
			  sock_test_write (client_fd, (uint8_t *) & conn->cfg,
					   sizeof (conn->cfg), NULL,
					   conn->cfg.verbose);
			  continue;
			}

		      switch (rx_cfg->test)
			{
			case VCL_TEST_TYPE_NONE:
			case VCL_TEST_TYPE_ECHO:
			  sync_config_and_reply (conn, rx_cfg);
			  break;

			case VCL_TEST_TYPE_BI:
			case VCL_TEST_TYPE_UNI:
			  stream_test_server_start_stop (conn, rx_cfg);
			  break;

			case VCL_TEST_TYPE_EXIT:
			  printf ("SERVER: Have a great day, "
				  "connection %d!\n", client_fd);
#ifdef VCL_TEST
			  vppcom_session_close (client_fd);
#else
			  close (client_fd);
#endif
			  conn_pool_free (conn);
			  printf ("SERVER: Closed client fd %d\n", client_fd);
#if ! SOCK_SERVER_USE_EPOLL
			  if (ssm->nfds == (ssm->listen_fd + 1))
#else
			  ssm->nfds--;
			  if (!ssm->nfds)
#endif
			    {
			      printf ("SERVER: All client connections "
				      "closed.\n\nSERVER: "
				      "May the force be with you!\n\n");
			      goto done;
			    }
			  break;

			default:
			  fprintf (stderr,
				   "SERVER: ERROR: Unknown test type!\n");
			  vcl_test_cfg_dump (rx_cfg, 0 /* is_client */ );
			  break;
			}
		      continue;
		    }

		  else if ((conn->cfg.test == VCL_TEST_TYPE_UNI) ||
			   (conn->cfg.test == VCL_TEST_TYPE_BI))
		    {
		      stream_test_server (conn, rx_bytes);
		      if (ioctl (conn->fd, FIONREAD))
			goto read_again;
		      continue;
		    }

		  else if (isascii (conn->buf[0]))
		    {
		      // If it looks vaguely like a string, make sure it's terminated
		      ((char *) conn->buf)[rx_bytes <
					   conn->buf_size ? rx_bytes :
					   conn->buf_size - 1] = 0;
		      printf ("SERVER (fd %d): RX (%d bytes) - '%s'\n",
			      conn->fd, rx_bytes, conn->buf);
		    }
		}
	      else		// rx_bytes < 0
		{
		  if (errno == ECONNRESET)
		    {
		      printf ("\nSERVER: Connection reset by remote peer.\n"
			      "  Y'all have a great day now!\n\n");
		      break;
		    }
		  else
		    continue;
		}

	      if (isascii (conn->buf[0]))
		{
		  /* If it looks vaguely like a string,
		   * make sure it's terminated
		   */
		  ((char *) conn->buf)[rx_bytes <
				       conn->buf_size ? rx_bytes :
				       conn->buf_size - 1] = 0;
		  if (xtra)
		    fprintf (stderr, "SERVER: ERROR: "
			     "FIFO not drained in previous test!\n"
			     "       extra chunks %u (0x%x)\n"
			     "        extra bytes %lu (0x%lx)\n",
			     xtra, xtra, xtra_bytes, xtra_bytes);

		  xtra = 0;
		  xtra_bytes = 0;

		  if (conn->cfg.verbose)
		    printf ("SERVER (fd %d): Echoing back\n", client_fd);

		  nbytes = strlen ((const char *) conn->buf) + 1;

		  tx_bytes = sock_test_write (client_fd, conn->buf,
					      nbytes, &conn->stats,
					      conn->cfg.verbose);
		  if (tx_bytes >= 0)
		    printf ("SERVER (fd %d): TX (%d bytes) - '%s'\n",
			    conn->fd, tx_bytes, conn->buf);
		}

	      else		// Extraneous read data from non-echo tests???
		{
		  xtra++;
		  xtra_bytes += rx_bytes;
		}
	    }
	}
    }

done:
#ifdef VCL_TEST
  vppcom_session_close (ssm->listen_fd);
  vppcom_app_destroy ();
#else
  close (ssm->listen_fd);

#if SOCK_SERVER_USE_EPOLL && !defined (VCL_TEST)
  close (ssm->af_unix_listen_fd);
  unlink ((const char *) SOCK_TEST_AF_UNIX_FILENAME);
#endif /* SOCK_SERVER_USE_EPOLL */

#endif
  if (ssm->conn_pool)
    free (ssm->conn_pool);

  return main_rv;
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */