-
Notifications
You must be signed in to change notification settings - Fork 11
/
Copy pathssmqtt.c
1052 lines (1023 loc) · 30.9 KB
/
ssmqtt.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
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
// MQTT handling for Solar System
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <popt.h>
#include <time.h>
#include <sys/time.h>
#include <stdlib.h>
#include <ctype.h>
#include <err.h>
#include <sys/socket.h>
#include <sys/signal.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <pthread.h>
#include <semaphore.h>
#include "AJL/ajl.h"
#include "sscert.h"
#include "mqttmsg.h"
#include "ssmqtt.h"
#define MAX_SETTING 1400 // Limit size of settings - allow for header and AES padding even
extern const char *cakey;
extern const char *cacert;
extern const char *mqttkey;
extern const char *mqttcert;
extern int sqldebug;
extern int dump;
extern int mqttdump;
SSL_CTX *ctx = NULL;
static void *
insecureserver (void *arg)
{ // Non TLS server that just sends new setting to get secure connection
int sock = -1;
device_t device = "";
char address[40] = "";
{ // Get passed settings
j_t j = arg;
sock = atoi (j_get (j, "socket") ? : "");
if (!sock)
errx (1, "server socket not set");
strncpy (address, j_get (j, "address") ? : "", sizeof (address));
j_delete (&j);
}
warnx ("Connect from %s (insecure)", address);
uint8_t rx[10000];
uint8_t tx[10000];
int pos = 0,
txp = 0;
const char *fail = NULL;
uint16_t keepalive = 0;
time_t katimeout = time (0) + 10;
int nfds = sock;
nfds++;
while (!fail)
{
time_t now = time (0);
if (now >= katimeout)
{
fail = "Timeout";
break;
}
fd_set r;
FD_ZERO (&r);
FD_SET (sock, &r);
{
struct timeval to = { pos ? 1 : katimeout - now, 0 };
select (nfds, &r, NULL, NULL, &to);
}
if (!txp)
{
if (FD_ISSET (sock, &r))
{ // Next block
int len = read (sock, rx + pos, sizeof (rx) - pos);
if (len <= 0)
{
fail = "Closed";
break;
}
pos += len;
}
if (fail)
break;
if (pos < 2)
continue;
int i,
l = 0; // Len is low byte first
for (i = 1; i < pos && (rx[i] & 0x80); i++)
l |= (rx[i] & 0x7F) << ((i - 1) * 7);
l |= (rx[i] & 0x7F) << ((i - 1) * 7);
i++;
if (i > pos || (i == pos && (rx[i - 1] & 0x80)))
continue; // Need more data
katimeout = time (0) + keepalive * 3 / 2;
if (dump)
{
fprintf (stderr, "[insecure]%s<", device);
for (int q = 0; q < i + l; q++)
fprintf (stderr, " %02X", rx[q]);
fprintf (stderr, "\n");
}
uint8_t *data = rx + i,
*end = rx + i + l;
// Process message
const char *process (void)
{
switch (*rx >> 4)
{
case 1: // Connect
{
if (data + 6 > end || data[0] || data[1] != 4 || memcmp (data + 2, "MQTT", 4))
return "Not MQTT format";
data += 6;
if (data + 1 > end || *data != 4)
return "Bad MQTT version";
data++;
if (data + 1 > end)
return "Too short";
data++; // Flags (we don't care)
if (data + 2 > end)
return "Too short";
keepalive = (data[0] << 8) + data[1];
katimeout = time (0) + keepalive * 3 / 2;
data += 2;
// Client ID
int clientlen = (data[0] << 8) + data[1];
data += 2;
char *client = (char *) data;
data += clientlen;
// We don't really care about these
// Will Topic
// Will Message
// Username
// Password
// Send connect ack
tx[txp++] = 0x20; // connack
tx[txp++] = 2;
tx[txp++] = 0; // no session
tx[txp++] = 0; // clean
if (clientlen != 15 || (strncmp (client, "SS-", 3) && strncmp (client, "SS:", 3)))
return "Bad client ID";
// Send new setting
char *topic = NULL;
if (asprintf (&topic, "setting/SS/%.12s", client + 3) <= 0)
errx (1, "malloc");
j_t j = j_create ();
j_t m = j_store_object (j, "mqtt");
j_store_string (m, "host", CONFIG_MQTT_HOSTNAME);
j_store_string (m, "cert", cacert);
txp += mqtt_encode (tx + txp, sizeof (tx) - txp, topic, j);
j_delete (&j);
free (topic);
}
break;
case 3: // Publish
break;
case 4: // Puback
break;
case 5: // Pubrec
break;
case 6: // pubpel
break;
case 7: // pubcomp
break;
case 8: // sub
{ // ACK the subscribe
if (data + 2 > end)
return "Too short";
unsigned short id = (data[0] << 8) + data[1];
data += 2;
// Ack
tx[txp++] = 0x90;
txp += 2; // len
tx[txp++] = (id >> 8);
tx[txp++] = id;
while (data + 2 <= end)
{
int l = (data[0] << 8) + data[1];
data += 2;
data += l;
uint8_t qos = *data++;
tx[txp++] = qos;
}
tx[1] = 0x80 + ((txp - 3) & 0x7f); // len
tx[2] = ((txp - 3) >> 7);
}
break;
case 10: // unsub
return "Not expecting unsubscribe";
break;
case 12: // pingreq
{
tx[txp++] = 0xD0;
tx[txp++] = 0;
}
break;
case 14: // disconnect
return "*Clean disconnect";
default:
warnx ("Message code %d", *rx >> 4);
return "Unexpected MQTT message code";
}
return NULL;
}
if (!fail)
fail = process ();
if (i + l < pos)
memmove (rx, rx + i + l, pos - i - l); // more
pos -= i + l;
}
if (!fail && txp)
{ // Send data
if (dump)
{
fprintf (stderr, "[insecure]%s>", device);
for (int i = 0; i < txp; i++)
fprintf (stderr, " %02X", tx[i]);
fprintf (stderr, "\n");
}
if (write (sock, tx, txp) <= 0)
fail = "tx fail";
txp = 0;
}
}
if (fail)
warnx ("Disconnect from %s (insecure): %s", address, fail);
close (sock);
return NULL;
}
static void *
server (void *arg)
{
int sock = -1;
device_t device = "";
char address[40] = "";
{ // Get passed settings
j_t j = arg;
sock = atoi (j_get (j, "socket") ? : "");
if (!sock)
errx (1, "server socket not set");
strncpy (address, j_get (j, "address") ? : "", sizeof (address));
j_delete (&j);
}
warnx ("Connect from %s", address);
int relaysock = -1; // The socket we listen to for tx messages to other side
slot_t us = slot_create (&relaysock, address);
if (!us)
{
close (sock);
return "Failed";
}
// TLS
SSL *ssl = SSL_new (ctx);
if (!ssl)
{
close (sock);
errx (1, "Cannot make SSL");
}
if (!SSL_set_fd (ssl, sock) || SSL_accept (ssl) != 1)
{
close (sock);
long e;
while ((e = ERR_get_error ()))
{
char temp[1000];
ERR_error_string_n (e, temp, sizeof (temp));
warnx ("%s", temp);
}
SSL_shutdown (ssl);
SSL_free (ssl);
warnx ("Failed SSL from %s", address);
slot_destroy (us);
return NULL;
}
X509 *cert = SSL_get_peer_certificate (ssl);
if (cert)
{
X509_NAME *subject = X509_get_subject_name (cert);
if (subject)
{
device_t id;
if (X509_NAME_get_text_by_NID (subject, NID_commonName, id, sizeof (id)) == sizeof (id) - 1)
strcpy (device, id);
}
X509_free (cert);
}
void addq (j_t * jp)
{
j_t j = *jp;
if (*device == '-')
j_int (j_path (j, "_meta.local"), us);
else
{
j_t meta = j_store_object (j, "_meta");
j_store_int (meta, "id", us);
if (*device)
j_store_string (meta, "device", device);
j_store_string (meta, "address", address);
mqtt_topic (j, NULL, 0);
}
mqtt_qin (jp);
}
uint8_t rx[10000];
uint8_t tx[10000];
int pos = 0,
txp = 0;
const char *fail = NULL;
uint16_t keepalive = 0;
time_t katimeout = time (0) + 10;
int nfds = sock;
if (relaysock > sock)
nfds = relaysock;
nfds++;
while (!fail)
{
time_t now = time (0);
if (now >= katimeout)
{
fail = "Timeout";
break;
}
fd_set r;
FD_ZERO (&r);
FD_SET (sock, &r);
if (!SSL_has_pending (ssl))
{
FD_SET (relaysock, &r);
struct timeval to = { pos ? 1 : katimeout - now, 0 }; // The 1 is a catch all for possible multiple messages, should not happen
select (nfds, &r, NULL, NULL, &to);
if (FD_ISSET (relaysock, &r))
{
txp = recv (relaysock, tx, sizeof (tx), 0);
if (txp <= 0)
break; // Closed connection
}
}
if (!txp && FD_ISSET (sock, &r))
{
{ // Next block
int len = SSL_read (ssl, rx + pos, sizeof (rx) - pos);
if (len <= 0)
{
fail = "Closed";
break;
}
pos += len;
}
if (fail)
break;
if (pos < 2)
continue;
int i,
l = 0; // Len is low byte first
for (i = 1; i < pos && (rx[i] & 0x80); i++)
l |= (rx[i] & 0x7F) << ((i - 1) * 7);
l |= (rx[i] & 0x7F) << ((i - 1) * 7);
i++;
if (i > pos || (i == pos && (rx[i - 1] & 0x80)))
continue; // Need more data
katimeout = time (0) + keepalive * 3 / 2;
if (dump)
{
fprintf (stderr, "%s<", device);
for (int q = 0; q < i + l; q++)
fprintf (stderr, " %02X", rx[q]);
fprintf (stderr, "\n");
}
uint8_t *data = rx + i,
*end = rx + i + l;
// Process message
const char *process (void)
{
switch (*rx >> 4)
{
case 1: // Connect
{
if (data + 6 > end || data[0] || data[1] != 4 || memcmp (data + 2, "MQTT", 4))
return "Not MQTT format";
data += 6;
if (data + 1 > end || *data != 4)
return "Bad MQTT version";
data++;
if (data + 1 > end)
return "Too short";
data++; // Flags (we don't care)
if (data + 2 > end)
return "Too short";
keepalive = (data[0] << 8) + data[1];
katimeout = time (0) + keepalive * 3 / 2;
data += 2;
// We don't really care about these
// Client ID
// Will Topic
// Will Message
// Username
// Password
// Send connect ack
tx[txp++] = 0x20; // connack
tx[txp++] = 2;
tx[txp++] = 0; // no session
tx[txp++] = 0; // clean
}
break;
case 3: // Publish
{
uint8_t qos = (*rx >> 1) & 3;
j_t j = mqtt_decode (rx, i + l);
if (j)
{
if (qos)
{
int id = atoi (j_get (j, "_meta.id") ? : "");
tx[txp++] = (qos == 1 ? 0x40 : 0x50); // puback/pubrec
tx[txp++] = 2;
tx[txp++] = (id >> 8);
tx[txp++] = id;
}
addq (&j);
}
}
break;
case 4: // Puback
break;
case 5: // Pubrec
break;
case 6: // pubpel
{
if (data + 2 > end)
return "Too short";
tx[txp++] = 0x70; // pubcomp
tx[txp++] = 2;
tx[txp++] = data[0];
tx[txp++] = data[1];
}
break;
case 7: // pubcomp
break;
case 8: // sub
{
if (data + 2 > end)
return "Too short";
unsigned short id = (data[0] << 8) + data[1];
data += 2;
// Ack
tx[txp++] = 0x90;
txp += 2; // len
tx[txp++] = (id >> 8);
tx[txp++] = id;
j_t j = j_create ();
j_t s = j_array (j_path (j, "_meta.subscribe"));
while (data + 2 <= end)
{
int l = (data[0] << 8) + data[1];
data += 2;
if (data + l <= end)
j_append_stringn (s, (char *) data, l);
data += l;
uint8_t qos = *data++;
tx[txp++] = qos;
}
addq (&j);
tx[1] = 0x80 + ((txp - 3) & 0x7f); // len
tx[2] = ((txp - 3) >> 7);
}
break;
case 10: // unsub
{
if (data + 2 > end)
return "Too short";
unsigned short id = (data[0] << 8) + data[1];
data += 2;
j_t j = j_create ();
j_t s = j_array (j_path (j, "_meta.unsubscribe"));
while (data + 2 <= end)
{
int l = (data[0] << 8) + data[1];
data += 2;
if (data + l <= end)
j_append_stringn (s, (char *) data, l);
data += l;
}
addq (&j);
// Ack
tx[txp++] = 0xB0;
tx[txp++] = 2;
tx[txp++] = (id >> 8);
tx[txp++] = id;
}
break;
case 12: // pingreq
{
tx[txp++] = 0xD0;
tx[txp++] = 0;
}
break;
case 14: // disconnect
return "*Clean disconnect";
default:
return "Unexpected MQTT message code";
}
return NULL;
}
if (!fail)
fail = process ();
if (i + l < pos)
memmove (rx, rx + i + l, pos - i - l); // more - but we don't expect that as TLS packets should be one message
pos -= i + l;
}
if (!fail && txp)
{ // Send data
if (dump)
{
fprintf (stderr, "%s>", device);
for (int i = 0; i < txp; i++)
fprintf (stderr, " %02X", tx[i]);
fprintf (stderr, "\n");
}
SSL_write (ssl, tx, txp);
txp = 0;
}
}
if (*device != '-')
{ // Down message if it sent and up and not internal
j_t j = j_create ();
addq (&j);
}
slot_t linked = slot_linked (us);
if (linked)
slot_close (linked); // tell linked to close (e.g. fobcommand task)
slot_destroy (us);
if (fail && *fail != '*')
warnx ("Fail from %s (%s)", address, fail);
else
warnx ("Closed from %s", address);
SSL_shutdown (ssl);
SSL_free (ssl);
close (sock);
return NULL;
}
static void *
insecurelistener (void *arg)
{ // Listen thread
arg = arg;
int slisten = -1;
struct addrinfo base = { ai_flags: AI_PASSIVE, ai_family:
#ifdef CONFIG_MQTT_IPV4
AF_INET
#else
AF_INET6
#endif
, ai_socktype:SOCK_STREAM
};
struct addrinfo *a = 0,
*p;
if (getaddrinfo (
#ifdef CONFIG_MQTT_IPV4
CONFIG_MQTT_HOSTNAME,
#else
"::",
#endif
CONFIG_MQTT_INSECURE_PORT, &base, &a) || !a)
errx (1, "Failed to find address for %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_INSECURE_PORT);
for (p = a; p; p = p->ai_next)
{
slisten = socket (p->ai_family, p->ai_socktype, p->ai_protocol);
if (slisten < 0)
continue;
int on = 1;
setsockopt (slisten, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on));
if (bind (slisten, p->ai_addr, p->ai_addrlen) || listen (slisten, 10))
{ // failed to connect
close (slisten);
slisten = -1;
continue;
}
break;
}
freeaddrinfo (a);
if (slisten < 0)
err (1, "Cannot bind local address %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_INSECURE_PORT);
if (sqldebug)
warnx ("Bind %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_INSECURE_PORT);
while (1)
{
struct sockaddr_in6 addr = { 0 };
socklen_t len = sizeof (addr);
int s = accept (slisten, (void *) &addr, &len);
if (s < 0)
{
warn ("Bad accept");
continue;
}
char from[INET6_ADDRSTRLEN + 1] = "";
if (addr.sin6_family == AF_INET)
inet_ntop (addr.sin6_family, &((struct sockaddr_in *) &addr)->sin_addr, from, sizeof (from));
else
inet_ntop (addr.sin6_family, &addr.sin6_addr, from, sizeof (from));
if (!strncmp (from, "::ffff:", 7) && strchr (from, '.'))
memmove (from, from + 7, strlen (from + 7) + 1);
j_t j = j_create ();
j_store_string (j, "address", from);
j_store_int (j, "socket", s);
pthread_t t;
if (pthread_create (&t, NULL, insecureserver, j))
err (1, "Cannot create insecure server thread");
pthread_detach (t);
}
return NULL;
}
static void *
listener (void *arg)
{ // Listen thread
arg = arg;
ctx = SSL_CTX_new (SSLv23_server_method ());
if (!ctx)
errx (1, "CTX fail");
if (*mqttkey)
{
EVP_PKEY *key = der2pkey (mqttkey);
if (SSL_CTX_use_PrivateKey (ctx, key) != 1)
errx (1, "Failed to set private key");
EVP_PKEY_free (key);
}
if (*mqttcert)
{
X509 *cert = der2x509 (mqttcert);
if (SSL_CTX_use_certificate (ctx, cert) != 1)
errx (1, "Failed to set certificate");
X509_free (cert);
}
if (*cacert)
{
X509 *cert = der2x509 (cacert);
if (SSL_CTX_add_client_CA (ctx, cert) != 1)
errx (1, "Failed to set client CA");
X509_STORE *ca = X509_STORE_new ();
X509_STORE_add_cert (ca, cert);
SSL_CTX_set_cert_store (ctx, ca);
X509_free (cert);
SSL_CTX_set_verify (ctx, SSL_VERIFY_PEER, NULL);
}
int slisten = -1;
struct addrinfo base = { ai_flags: AI_PASSIVE, ai_family:
#ifdef CONFIG_MQTT_IPV4
AF_INET
#else
AF_INET6
#endif
, ai_socktype:SOCK_STREAM
};
struct addrinfo *a = 0,
*p;
if (getaddrinfo (
#ifdef CONFIG_MQTT_IPV4
CONFIG_MQTT_HOSTNAME,
#else
"::",
#endif
CONFIG_MQTT_PORT, &base, &a) || !a)
errx (1, "Failed to find address for %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_PORT);
for (p = a; p; p = p->ai_next)
{
slisten = socket (p->ai_family, p->ai_socktype, p->ai_protocol);
if (slisten < 0)
continue;
int on = 1;
setsockopt (slisten, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on));
if (bind (slisten, p->ai_addr, p->ai_addrlen) || listen (slisten, 10))
{ // failed to connect
close (slisten);
slisten = -1;
continue;
}
break;
}
freeaddrinfo (a);
if (slisten < 0)
err (1, "Cannot bind local address %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_PORT);
if (sqldebug)
warnx ("Bind %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_PORT);
while (1)
{
struct sockaddr_in6 addr = { 0 };
socklen_t len = sizeof (addr);
int s = accept (slisten, (void *) &addr, &len);
if (s < 0)
{
warn ("Bad accept");
continue;
}
char from[INET6_ADDRSTRLEN + 1] = "";
if (addr.sin6_family == AF_INET)
inet_ntop (addr.sin6_family, &((struct sockaddr_in *) &addr)->sin_addr, from, sizeof (from));
else
inet_ntop (addr.sin6_family, &addr.sin6_addr, from, sizeof (from));
if (!strncmp (from, "::ffff:", 7) && strchr (from, '.'))
memmove (from, from + 7, strlen (from + 7) + 1);
j_t j = j_create ();
j_store_string (j, "address", from);
j_store_int (j, "socket", s);
pthread_t t;
if (pthread_create (&t, NULL, server, j))
err (1, "Cannot create server thread");
pthread_detach (t);
}
return NULL;
}
static pthread_mutex_t rxq_mutex;
static sem_t rxq_sem;
static pthread_mutex_t slot_mutex;
void
mqtt_start (void)
{ // Start MQTT server (not a real MQTT server, just talks MQTT)
OPENSSL_init_ssl (0, NULL);
pthread_mutex_init (&slot_mutex, NULL);
pthread_mutex_init (&rxq_mutex, NULL);
sem_init (&rxq_sem, 0, 0);
{ // Set up listen thread (secure)
pthread_t t;
if (pthread_create (&t, NULL, listener, NULL))
err (1, "Cannot create listener thread");
pthread_detach (t);
}
{ // Set up listen thread (insecure)
pthread_t t;
if (pthread_create (&t, NULL, insecurelistener, NULL))
err (1, "Cannot create listener thread");
pthread_detach (t);
}
}
// Incoming queue
typedef struct rxq_s rxq_t;
struct rxq_s
{
rxq_t *next;
j_t j;
};
static rxq_t *rxq = NULL,
*rxqhead = NULL;
void
mqtt_qin (j_t * jp)
{ // Queue incoming
j_t j = *jp;
rxq_t *q = malloc (sizeof (*q));
q->j = j;
*jp = NULL;
q->next = NULL;
pthread_mutex_lock (&rxq_mutex);
if (rxqhead)
rxqhead->next = q;
else
rxq = q;
rxqhead = q;
sem_post (&rxq_sem);
pthread_mutex_unlock (&rxq_mutex);
}
j_t
incoming (void)
{ // Wait for next rx message
const struct timespec to = { time (0) + 60, 0 };
if (sem_timedwait (&rxq_sem, &to))
return NULL;
pthread_mutex_lock (&rxq_mutex);
rxq_t *q = rxq;
if (q)
{
rxq = q->next;
if (!rxq)
rxqhead = NULL;
}
pthread_mutex_unlock (&rxq_mutex);
if (!q)
return NULL; // Should not happen
j_t j = q->j;
free (q);
if (mqttdump)
{
j_t meta = j_find (j, "_meta");
if (meta)
j_detach (meta);
if (meta)
{
slot_t id = strtoll (j_get (meta, "id") ? : j_get (meta, "local") ? : "", NULL, 10);
if (id)
fprintf (stderr, "%lld", id);
}
fprintf (stderr, "<:");
if (meta)
{
const char *topic = j_get (meta, "topic");
if (topic)
fprintf (stderr, "%s ", topic);
else
{
if ((topic = j_get (meta, "prefix")))
fprintf (stderr, "%s/", topic);
if ((topic = j_get (meta, "target")))
fprintf (stderr, "%s/", topic);
if ((topic = j_get (meta, "suffix")))
fprintf (stderr, "%s", topic);
fprintf (stderr, " ");
}
}
if (j_isobject (j) && !j_len (j) && meta)
{
fprintf (stderr, "*");
j_err (j_write (meta, stderr));
} else
j_err (j_write (j, stderr));
fprintf (stderr, "\n");
if (meta)
j_store_json (j, "_meta", &meta);
}
return j;
}
// Server slot
#define SLOT_MAX 65536
static int slot_count = 0;
struct slots_s
{
slot_t id; // Slot ID
slot_t linked; // Linked ID
int txsock; // Socket for sending data
int rxsock; // Socket for receiving data
};
typedef struct slots_s slots_t;
static slots_t slots[SLOT_MAX] = { };
slot_t
slot_create (int *sockp, const char *address)
{ // Create a slot, and allocated the non blocking linked sockets, returns server socket
static slot_t slot_id = 1; // Next id to allocate
pthread_mutex_lock (&slot_mutex);
if (slot_count >= SLOT_MAX)
{
warnx ("Too many connections");
pthread_mutex_unlock (&slot_mutex);
return 0;
}
slots_t *slot;
while ((slot = &slots[slot_id % SLOT_MAX])->id)
slot_id++; // One has to exist based on slot_count - maybe one day make a free slot linkage
{
int sp[2];
if (socketpair (AF_LOCAL, SOCK_DGRAM, 0, sp) < 0)
err (1, "socketpair");
slot->txsock = sp[0];
slot->rxsock = sp[1];
if (sockp)
*sockp = sp[1];
}
slot->id = slot_id;
slot->linked = 0;
slot_count++;
pthread_mutex_unlock (&slot_mutex);
if (mqttdump)
warnx ("Create %lld, slot count %d, %s", slot_id, slot_count, address);
return slot_id;
}
slot_t
slot_linked (slot_t id)
{ // Return the linked slot (cleared if linked slot has been destroyed)
if (!id)
return 0;
slot_t linked = 0;
slots_t *s = &slots[id % SLOT_MAX];
pthread_mutex_lock (&slot_mutex);
if (s->id == id && (linked = s->linked) && slots[linked % SLOT_MAX].id != linked)
s->linked = linked = 0; // Bad far end
pthread_mutex_unlock (&slot_mutex);
return linked;
}
void
slot_link (slot_t id, slot_t linked)
{ // Link two slots, both show slot_linked as the other
if (!id)
return;
slots_t *s = &slots[id % SLOT_MAX];
pthread_mutex_lock (&slot_mutex);
if (s->linked && slots[s->linked % SLOT_MAX].id && slots[s->linked % SLOT_MAX].linked == id)
slots[s->linked % SLOT_MAX].linked = 0; // Unlink
if (s->id == id)
s->linked = linked;
pthread_mutex_unlock (&slot_mutex);
}
void
slot_close (slot_t id)
{ // Sends the server a zero length message to the server asking it to close and destroy
if (!id)
return;
slots_t *s = &slots[id % SLOT_MAX];
pthread_mutex_lock (&slot_mutex);
if (s->id == id)
send (s->txsock, NULL, 0, 0); // Could, in theory, hang...
pthread_mutex_unlock (&slot_mutex);
if (mqttdump)
warnx ("Close request %lld", id);
}
void
slot_destroy (slot_t id)
{ // Destroy a slot, called by server when closing, handles socket closing, unlinks
if (!id)
return;
slots_t *s = &slots[id % SLOT_MAX];
pthread_mutex_lock (&slot_mutex);
if (s->id == id)
{
slot_t linked = s->linked;
if (slots[linked % SLOT_MAX].id == linked && slots[linked % SLOT_MAX].linked == id)
slots[linked % SLOT_MAX].linked = 0;
s->id = 0;
s->linked = 0;
close (s->txsock);
close (s->rxsock);
s->txsock = -1;
s->rxsock = -1;
slot_count--;
}
pthread_mutex_unlock (&slot_mutex);
if (mqttdump)
warnx ("Destroy %lld, slot count %d", id, slot_count);
}
const char *
slot_send (slot_t id, const char *prefix, const char *deviceid, const char *suffix, j_t * jp)
{
char *topic = NULL;
j_t j = NULL;
if (jp)
{
j = *jp;
*jp = NULL;
}
const char *process (j_t j)
{
if (!topic
&& ((!prefix && !(topic = strdup ("")))
|| (prefix
&& asprintf (&topic, "%s/SS/%s%s%s", prefix, (deviceid && *deviceid) ? deviceid : "*", suffix ? "/" : "",
suffix ? : "") < 0)))
return "malloc";
uint8_t tx[2048]; // Sane limit
unsigned int txp = mqtt_encode (tx, sizeof (tx), topic, j);
pthread_mutex_lock (&slot_mutex);
if (slots[id % SLOT_MAX].id != id)
{
pthread_mutex_unlock (&slot_mutex);
warnx ("Slot Send %lld but slot is %lld", id, slots[id % SLOT_MAX].id);
return slots[id % SLOT_MAX].id ? "Recycled id" : "Closed id";
}
if (send (slots[id % SLOT_MAX].txsock, tx, txp, 0) < 0)
{
pthread_mutex_unlock (&slot_mutex);
return "Failed to send";
}
pthread_mutex_unlock (&slot_mutex);
if (mqttdump)
{
fprintf (stderr, "%lld>:%s ", id, topic);
if (j)
j_err (j_write (j, stderr));
fprintf (stderr, "\n");
}
return NULL;
}
const char *fail = NULL;
#ifdef MAX_SETTING
if (prefix && !strcmp (prefix, "setting"))
{