-
Notifications
You must be signed in to change notification settings - Fork 13.3k
/
Copy pathESP8266mDNS_Legacy.cpp
1290 lines (1114 loc) · 40.8 KB
/
ESP8266mDNS_Legacy.cpp
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
/*
ESP8266 Multicast DNS (port of CC3000 Multicast DNS library)
Version 1.1
Copyright (c) 2013 Tony DiCola ([email protected])
ESP8266 port (c) 2015 Ivan Grokhotkov ([email protected])
MDNS-SD Suport 2015 Hristo Gochkov
Extended MDNS-SD support 2016 Lars Englund ([email protected])
License (MIT license):
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
// Important RFC's for reference:
// - DNS request and response: http://www.ietf.org/rfc/rfc1035.txt
// - Multicast DNS: http://www.ietf.org/rfc/rfc6762.txt
// - MDNS-SD: https://tools.ietf.org/html/rfc6763
#ifndef LWIP_OPEN_SRC
#define LWIP_OPEN_SRC
#endif
#include "ESP8266mDNS.h"
#include <functional>
#include "debug.h"
extern "C" {
#include "osapi.h"
#include "ets_sys.h"
#include "user_interface.h"
}
#include "WiFiUdp.h"
#include "lwip/opt.h"
#include "lwip/udp.h"
#include "lwip/inet.h"
#include "lwip/igmp.h"
#include "lwip/mem.h"
#include "include/UdpContext.h"
namespace Legacy_MDNSResponder {
#ifdef DEBUG_ESP_MDNS
#define DEBUG_ESP_MDNS_ERR
#define DEBUG_ESP_MDNS_TX
#define DEBUG_ESP_MDNS_RX
#endif
#define MDNS_NAME_REF 0xC000
#define MDNS_TYPE_AAAA 0x001C
#define MDNS_TYPE_A 0x0001
#define MDNS_TYPE_PTR 0x000C
#define MDNS_TYPE_SRV 0x0021
#define MDNS_TYPE_TXT 0x0010
#define MDNS_CLASS_IN 0x0001
#define MDNS_CLASS_IN_FLUSH_CACHE 0x8001
#define MDNS_ANSWERS_ALL 0x0F
#define MDNS_ANSWER_PTR 0x08
#define MDNS_ANSWER_TXT 0x04
#define MDNS_ANSWER_SRV 0x02
#define MDNS_ANSWER_A 0x01
#define _conn_read32() (((uint32_t)_conn->read() << 24) | ((uint32_t)_conn->read() << 16) | ((uint32_t)_conn->read() << 8) | _conn->read())
#define _conn_read16() (((uint16_t)_conn->read() << 8) | _conn->read())
#define _conn_read8() _conn->read()
#define _conn_readS(b,l) _conn->read((char*)(b),l);
static const IPAddress MDNS_MULTICAST_ADDR(224, 0, 0, 251);
static const int MDNS_MULTICAST_TTL = 1;
static const int MDNS_PORT = 5353;
struct MDNSService {
MDNSService* _next;
char _name[32];
char _proto[4];
uint16_t _port;
uint16_t _txtLen; // length of all txts
struct MDNSTxt * _txts;
};
struct MDNSTxt{
MDNSTxt * _next;
String _txt;
};
struct MDNSAnswer {
MDNSAnswer* next;
uint8_t ip[4];
uint16_t port;
char *hostname;
};
struct MDNSQuery {
char _service[32];
char _proto[4];
};
MDNSResponder::MDNSResponder() : _conn(0) {
_services = 0;
_instanceName = "";
_answers = 0;
_query = 0;
_newQuery = false;
_waitingForAnswers = false;
}
MDNSResponder::~MDNSResponder() {
if (_query != 0) {
os_free(_query);
_query = 0;
}
// Clear answer list
MDNSAnswer *answer;
int numAnswers = _getNumAnswers();
for (int n = numAnswers - 1; n >= 0; n--) {
answer = _getAnswerFromIdx(n);
os_free(answer->hostname);
os_free(answer);
answer = 0;
}
_answers = 0;
if (_conn) {
_conn->unref();
}
}
bool MDNSResponder::begin(const char* hostname){
size_t n = strlen(hostname);
if (n > 63) { // max size for a single label.
return false;
}
// Copy in hostname characters as lowercase
_hostName = hostname;
_hostName.toLowerCase();
// If instance name is not already set copy hostname to instance name
if (_instanceName.equals("") ) _instanceName=hostname;
_gotIPHandler = WiFi.onStationModeGotIP([this](const WiFiEventStationModeGotIP& event){
(void) event;
_restart();
});
_disconnectedHandler = WiFi.onStationModeDisconnected([this](const WiFiEventStationModeDisconnected& event) {
(void) event;
_restart();
});
return _listen();
}
void MDNSResponder::notifyAPChange() {
_restart();
}
void MDNSResponder::_restart() {
if (_conn) {
_conn->unref();
_conn = nullptr;
}
_listen();
}
bool MDNSResponder::_listen() {
// Open the MDNS socket if it isn't already open.
if (!_conn) {
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.println("MDNS listening");
#endif
IPAddress mdns(MDNS_MULTICAST_ADDR);
if (igmp_joingroup(IP4_ADDR_ANY4, mdns)!= ERR_OK) {
return false;
}
_conn = new UdpContext;
_conn->ref();
if (!_conn->listen(IP_ADDR_ANY, MDNS_PORT)) {
return false;
}
_conn->setMulticastTTL(MDNS_MULTICAST_TTL);
_conn->onRx(std::bind(&MDNSResponder::update, this));
_conn->connect(mdns, MDNS_PORT);
}
return true;
}
void MDNSResponder::update() {
if (!_conn || !_conn->next())
return;
_parsePacket();
}
void MDNSResponder::setInstanceName(String name){
if (name.length() > 63)
return;
_instanceName = name;
}
bool MDNSResponder::addServiceTxt(char *name, char *proto, char *key, char *value){
MDNSService* servicePtr;
uint8_t txtLen = os_strlen(key) + os_strlen(value) + 1; // Add one for equals sign
txtLen += 1; //accounts for length byte added when building the txt responce
//Find the service
for (servicePtr = _services; servicePtr; servicePtr = servicePtr->_next) {
//Checking Service names
if(strcmp(servicePtr->_name, name) == 0 && strcmp(servicePtr->_proto, proto) == 0) {
//found a service name match
if (servicePtr->_txtLen + txtLen > 1300)
return false; //max txt record size
MDNSTxt *newtxt = new MDNSTxt;
newtxt->_txt = String(key) + "=" + String(value);
newtxt->_next = 0;
if(servicePtr->_txts == 0) { //no services have been added
//Adding First TXT to service
servicePtr->_txts = newtxt;
servicePtr->_txtLen += txtLen;
return true;
} else {
MDNSTxt * txtPtr = servicePtr->_txts;
while(txtPtr->_next != 0) {
txtPtr = txtPtr->_next;
}
//adding another TXT to service
txtPtr->_next = newtxt;
servicePtr->_txtLen += txtLen;
return true;
}
}
}
return false;
}
void MDNSResponder::addService(char *name, char *proto, uint16_t port){
if(_getServicePort(name, proto) != 0)
return;
if(os_strlen(name) > 32 || os_strlen(proto) != 3)
return; //bad arguments
struct MDNSService *srv = (struct MDNSService*)(os_malloc(sizeof(struct MDNSService)));
os_strcpy(srv->_name, name);
os_strcpy(srv->_proto, proto);
srv->_port = port;
srv->_next = 0;
srv->_txts = 0;
srv->_txtLen = 0;
if(_services == 0) {
_services = srv;
} else {
MDNSService* servicePtr = _services;
while(servicePtr->_next != 0)
servicePtr = servicePtr->_next;
servicePtr->_next = srv;
}
}
int MDNSResponder::queryService(char *service, char *proto) {
#ifdef DEBUG_ESP_MDNS_TX
DEBUG_ESP_PORT.printf("queryService %s %s\n", service, proto);
#endif
while(_answers!=0){
MDNSAnswer *currAnswer = _answers;
_answers = _answers->next;
os_free(currAnswer->hostname);
os_free(currAnswer);
currAnswer = 0;
}
if (_query != 0) {
os_free(_query);
_query = 0;
}
_query = (struct MDNSQuery*)(os_malloc(sizeof(struct MDNSQuery)));
os_strcpy(_query->_service, service);
os_strcpy(_query->_proto, proto);
_newQuery = true;
char underscore[] = "_";
// build service name with _
char serviceName[os_strlen(service) + 2];
os_strcpy(serviceName, underscore);
os_strcat(serviceName, service);
size_t serviceNameLen = os_strlen(serviceName);
//build proto name with _
char protoName[5];
os_strcpy(protoName, underscore);
os_strcat(protoName, proto);
size_t protoNameLen = 4;
//local string
char localName[] = "local";
size_t localNameLen = 5;
//terminator
char terminator[] = "\0";
// Only supports sending one PTR query
uint8_t questionCount = 1;
_waitingForAnswers = true;
for (int itfn = 0; itfn < 2; itfn++) {
struct ip_info ip_info;
wifi_get_ip_info((!itfn) ? SOFTAP_IF : STATION_IF, &ip_info);
if (!ip_info.ip.addr)
continue;
_conn->setMulticastInterface(IPAddress(ip_info.ip.addr));
// Write the header
_conn->flush();
uint8_t head[12] = {
0x00, 0x00, //ID = 0
0x00, 0x00, //Flags = response + authoritative answer
0x00, questionCount, //Question count
0x00, 0x00, //Answer count
0x00, 0x00, //Name server records
0x00, 0x00 //Additional records
};
_conn->append(reinterpret_cast<const char*>(head), 12);
// Only supports sending one PTR query
// Send the Name field (eg. "_http._tcp.local")
_conn->append(reinterpret_cast<const char*>(&serviceNameLen), 1); // lenght of "_" + service
_conn->append(reinterpret_cast<const char*>(serviceName), serviceNameLen); // "_" + service
_conn->append(reinterpret_cast<const char*>(&protoNameLen), 1); // lenght of "_" + proto
_conn->append(reinterpret_cast<const char*>(protoName), protoNameLen); // "_" + proto
_conn->append(reinterpret_cast<const char*>(&localNameLen), 1); // lenght of "local"
_conn->append(reinterpret_cast<const char*>(localName), localNameLen); // "local"
_conn->append(reinterpret_cast<const char*>(&terminator), 1); // terminator
//Send the type and class
uint8_t ptrAttrs[4] = {
0x00, 0x0c, //PTR record query
0x00, 0x01 //Class IN
};
_conn->append(reinterpret_cast<const char*>(ptrAttrs), 4);
_conn->send();
}
#ifdef DEBUG_ESP_MDNS_TX
DEBUG_ESP_PORT.println("Waiting for answers..");
#endif
interruptable_delay(1000);
_waitingForAnswers = false;
return _getNumAnswers();
}
String MDNSResponder::hostname(int idx) {
MDNSAnswer *answer = _getAnswerFromIdx(idx);
if (answer == 0) {
return String();
}
return answer->hostname;
}
IPAddress MDNSResponder::IP(int idx) {
MDNSAnswer *answer = _getAnswerFromIdx(idx);
if (answer == 0) {
return IPAddress();
}
return IPAddress(answer->ip);
}
uint16_t MDNSResponder::port(int idx) {
MDNSAnswer *answer = _getAnswerFromIdx(idx);
if (answer == 0) {
return 0;
}
return answer->port;
}
MDNSAnswer* MDNSResponder::_getAnswerFromIdx(int idx) {
MDNSAnswer *answer = _answers;
while (answer != 0 && idx-- > 0) {
answer = answer->next;
}
if (idx > 0) {
return 0;
}
return answer;
}
int MDNSResponder::_getNumAnswers() {
int numAnswers = 0;
MDNSAnswer *answer = _answers;
while (answer != 0) {
numAnswers++;
answer = answer->next;
}
return numAnswers;
}
MDNSTxt * MDNSResponder::_getServiceTxt(char *name, char *proto){
MDNSService* servicePtr;
for (servicePtr = _services; servicePtr; servicePtr = servicePtr->_next) {
if(servicePtr->_port > 0 && strcmp(servicePtr->_name, name) == 0 && strcmp(servicePtr->_proto, proto) == 0){
if (servicePtr->_txts == 0)
return nullptr;
return servicePtr->_txts;
}
}
return nullptr;
}
uint16_t MDNSResponder::_getServiceTxtLen(char *name, char *proto){
MDNSService* servicePtr;
for (servicePtr = _services; servicePtr; servicePtr = servicePtr->_next) {
if(servicePtr->_port > 0 && strcmp(servicePtr->_name, name) == 0 && strcmp(servicePtr->_proto, proto) == 0){
if (servicePtr->_txts == 0)
return false;
return servicePtr->_txtLen;
}
}
return 0;
}
uint16_t MDNSResponder::_getServicePort(char *name, char *proto){
MDNSService* servicePtr;
for (servicePtr = _services; servicePtr; servicePtr = servicePtr->_next) {
if(servicePtr->_port > 0 && strcmp(servicePtr->_name, name) == 0 && strcmp(servicePtr->_proto, proto) == 0){
return servicePtr->_port;
}
}
return 0;
}
IPAddress MDNSResponder::_getRequestMulticastInterface(){
struct ip_info ip_info;
bool match_ap = false;
if (wifi_get_opmode() & SOFTAP_MODE) {
const IPAddress& remote_ip = _conn->getRemoteAddress();
wifi_get_ip_info(SOFTAP_IF, &ip_info);
IPAddress infoIp(ip_info.ip);
IPAddress infoMask(ip_info.netmask);
if (ip_info.ip.addr && ip_addr_netcmp((const ip_addr_t*)remote_ip, (const ip_addr_t*)infoIp, ip_2_ip4((const ip_addr_t*)infoMask)))
match_ap = true;
}
if (!match_ap)
wifi_get_ip_info(STATION_IF, &ip_info);
return IPAddress(ip_info.ip.addr);
}
void MDNSResponder::_parsePacket(){
int i;
char tmp;
bool serviceParsed = false;
bool protoParsed = false;
bool localParsed = false;
char hostName[255];
uint8_t hostNameLen;
char serviceName[32];
uint8_t serviceNameLen;
uint16_t servicePort = 0;
char protoName[32];
protoName[0] = 0;
uint8_t protoNameLen = 0;
uint16_t packetHeader[6];
for(i=0; i<6; i++)
packetHeader[i] = _conn_read16();
if ((packetHeader[1] & 0x8000) != 0) { // Read answers
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("Reading answers RX: REQ, ID:%u, Q:%u, A:%u, NS:%u, ADD:%u\n", packetHeader[0], packetHeader[2], packetHeader[3], packetHeader[4], packetHeader[5]);
#endif
if (!_waitingForAnswers) {
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.println("Not expecting any answers right now, returning");
#endif
_conn->flush();
return;
}
int numAnswers = packetHeader[3] + packetHeader[5];
// Assume that the PTR answer always comes first and that it is always accompanied by a TXT, SRV, AAAA (optional) and A answer in the same packet.
if (numAnswers < 4) {
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("Expected a packet with 4 or more answers, got %u\n", numAnswers);
#endif
_conn->flush();
return;
}
uint8_t tmp8;
uint16_t answerPort = 0;
uint8_t answerIp[4] = { 0,0,0,0 };
char answerHostName[255];
bool serviceMatch = false;
MDNSAnswer *answer;
uint8_t partsCollected = 0;
uint8_t stringsRead = 0;
answerHostName[0] = '\0';
// Clear answer list
if (_newQuery) {
int oldAnswers = _getNumAnswers();
for (int n = oldAnswers - 1; n >= 0; n--) {
answer = _getAnswerFromIdx(n);
os_free(answer->hostname);
os_free(answer);
answer = 0;
}
_answers = 0;
_newQuery = false;
}
while (numAnswers--) {
// Read name
stringsRead = 0;
size_t last_bufferpos = 0;
do {
tmp8 = _conn_read8();
if (tmp8 == 0x00) { // End of name
break;
}
if (tmp8 & 0xC0) { // Compressed pointer
uint16_t offset = ((((uint16_t)tmp8) & ~0xC0) << 8) | _conn_read8();
if (_conn->isValidOffset(offset)) {
if (0 == last_bufferpos)
last_bufferpos = _conn->tell();
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.print("Compressed pointer, jumping from ");
DEBUG_ESP_PORT.print(last_bufferpos);
DEBUG_ESP_PORT.print(" to ");
DEBUG_ESP_PORT.println(offset);
#endif
_conn->seek(offset);
tmp8 = _conn_read8();
}
else {
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.print("Skipping malformed compressed pointer");
#endif
tmp8 = _conn_read8();
break;
}
}
if(stringsRead > 3){
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.println("failed to read the response name");
#endif
_conn->flush();
return;
}
_conn_readS(serviceName, tmp8);
serviceName[tmp8] = '\0';
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf(" %d ", tmp8);
for (int n = 0; n < tmp8; n++) {
DEBUG_ESP_PORT.printf("%c", serviceName[n]);
}
DEBUG_ESP_PORT.println();
#endif
if (serviceName[0] == '_') {
if (strcmp(&serviceName[1], _query->_service) == 0) {
serviceMatch = true;
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("found matching service: %s\n", _query->_service);
#endif
}
}
stringsRead++;
} while (true);
if (last_bufferpos > 0)
{
_conn->seek(last_bufferpos);
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.print("Compressed pointer, jumping back to ");
DEBUG_ESP_PORT.println(last_bufferpos);
#endif
}
uint16_t answerType = _conn_read16(); // Read type
uint16_t answerClass = _conn_read16(); // Read class
uint32_t answerTtl = _conn_read32(); // Read ttl
uint16_t answerRdlength = _conn_read16(); // Read rdlength
(void) answerClass;
(void) answerTtl;
if(answerRdlength > 255){
if(answerType == MDNS_TYPE_TXT && answerRdlength < 1460){
while(--answerRdlength) _conn->read();
} else {
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("Data len too long! %u\n", answerRdlength);
#endif
_conn->flush();
return;
}
}
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("type: %04x rdlength: %d\n", answerType, answerRdlength);
#endif
if (answerType == MDNS_TYPE_PTR) {
partsCollected |= 0x01;
_conn_readS(hostName, answerRdlength); // Read rdata
if(hostName[answerRdlength-2] & 0xc0){
memcpy(answerHostName, hostName+1, answerRdlength-3);
answerHostName[answerRdlength-3] = '\0';
}
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("PTR %d ", answerRdlength);
for (int n = 0; n < answerRdlength; n++) {
DEBUG_ESP_PORT.printf("%c", hostName[n]);
}
DEBUG_ESP_PORT.println();
#endif
}
else if (answerType == MDNS_TYPE_TXT) {
partsCollected |= 0x02;
_conn_readS(hostName, answerRdlength); // Read rdata
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("TXT %d ", answerRdlength);
for (int n = 0; n < answerRdlength; n++) {
DEBUG_ESP_PORT.printf("%c", hostName[n]);
}
DEBUG_ESP_PORT.println();
#endif
}
else if (answerType == MDNS_TYPE_SRV) {
partsCollected |= 0x04;
uint16_t answerPrio = _conn_read16(); // Read priority
uint16_t answerWeight = _conn_read16(); // Read weight
answerPort = _conn_read16(); // Read port
last_bufferpos = 0;
(void) answerPrio;
(void) answerWeight;
// Read hostname
tmp8 = _conn_read8();
if (tmp8 & 0xC0) { // Compressed pointer
uint16_t offset = ((((uint16_t)tmp8) & ~0xC0) << 8) | _conn_read8();
if (_conn->isValidOffset(offset)) {
last_bufferpos = _conn->tell();
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.print("Compressed pointer, jumping from ");
DEBUG_ESP_PORT.print(last_bufferpos);
DEBUG_ESP_PORT.print(" to ");
DEBUG_ESP_PORT.println(offset);
#endif
_conn->seek(offset);
tmp8 = _conn_read8();
}
else {
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.print("Skipping malformed compressed pointer");
#endif
tmp8 = _conn_read8();
break;
}
}
_conn_readS(answerHostName, tmp8);
answerHostName[tmp8] = '\0';
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("SRV %d ", tmp8);
for (int n = 0; n < tmp8; n++) {
DEBUG_ESP_PORT.printf("%02x ", answerHostName[n]);
}
DEBUG_ESP_PORT.printf("\n%s\n", answerHostName);
#endif
if (last_bufferpos > 0)
{
_conn->seek(last_bufferpos);
tmp8 = 2; // Size of compression octets
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.print("Compressed pointer, jumping back to ");
DEBUG_ESP_PORT.println(last_bufferpos);
#endif
}
if (answerRdlength - (6 + 1 + tmp8) > 0) { // Skip any remaining rdata
_conn_readS(hostName, answerRdlength - (6 + 1 + tmp8));
}
}
else if (answerType == MDNS_TYPE_A) {
partsCollected |= 0x08;
for (int i = 0; i < 4; i++) {
answerIp[i] = _conn_read8();
}
}
else {
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("Ignoring unsupported type %02x\n", tmp8);
#endif
for (int n = 0; n < answerRdlength; n++)
(void)_conn_read8();
}
if ((partsCollected == 0x0F) && serviceMatch) {
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.println("All answers parsed, adding to _answers list..");
#endif
// Add new answer to answer list
if (_answers == 0) {
_answers = (struct MDNSAnswer*)(os_malloc(sizeof(struct MDNSAnswer)));
answer = _answers;
}
else {
answer = _answers;
while (answer->next != 0) {
answer = answer->next;
}
answer->next = (struct MDNSAnswer*)(os_malloc(sizeof(struct MDNSAnswer)));
answer = answer->next;
}
answer->next = 0;
answer->hostname = 0;
// Populate new answer
answer->port = answerPort;
for (int i = 0; i < 4; i++) {
answer->ip[i] = answerIp[i];
}
answer->hostname = (char *)os_malloc(strlen(answerHostName) + 1);
os_strcpy(answer->hostname, answerHostName);
_conn->flush();
return;
}
}
_conn->flush();
return;
}
// PARSE REQUEST NAME
hostNameLen = _conn_read8() % 255;
_conn_readS(hostName, hostNameLen);
hostName[hostNameLen] = '\0';
if(hostName[0] == '_'){
serviceParsed = true;
memcpy(serviceName, hostName+1, hostNameLen);
serviceNameLen = hostNameLen-1;
hostNameLen = 0;
}
if(hostNameLen > 0 && !_hostName.equals(hostName) && !_instanceName.equals(hostName)){
#ifdef DEBUG_ESP_MDNS_ERR
DEBUG_ESP_PORT.printf("ERR_NO_HOST: %s\n", hostName);
DEBUG_ESP_PORT.printf("hostname: %s\n", _hostName.c_str() );
DEBUG_ESP_PORT.printf("instance: %s\n", _instanceName.c_str() );
#endif
_conn->flush();
return;
}
if(!serviceParsed){
serviceNameLen = _conn_read8() % 255;
_conn_readS(serviceName, serviceNameLen);
serviceName[serviceNameLen] = '\0';
if(serviceName[0] == '_'){
memmove(serviceName, serviceName+1, serviceNameLen);
serviceNameLen--;
serviceParsed = true;
} else if(serviceNameLen == 5 && strcmp("local", serviceName) == 0){
tmp = _conn_read8();
if(tmp == 0){
serviceParsed = true;
serviceNameLen = 0;
protoParsed = true;
protoNameLen = 0;
localParsed = true;
} else {
#ifdef DEBUG_ESP_MDNS_ERR
DEBUG_ESP_PORT.printf("ERR_FQDN: %s\n", serviceName);
#endif
_conn->flush();
return;
}
} else {
#ifdef DEBUG_ESP_MDNS_ERR
DEBUG_ESP_PORT.printf("ERR_SERVICE: %s\n", serviceName);
#endif
_conn->flush();
return;
}
}
if(!protoParsed){
protoNameLen = _conn_read8() % 255;
_conn_readS(protoName, protoNameLen);
protoName[protoNameLen] = '\0';
if(protoNameLen == 4 && protoName[0] == '_'){
memmove(protoName, protoName+1, protoNameLen);
protoNameLen--;
protoParsed = true;
} else if(strcmp("services", serviceName) == 0 && strcmp("_dns-sd", protoName) == 0){
_conn->flush();
IPAddress interface = _getRequestMulticastInterface();
_replyToTypeEnumRequest(interface);
return;
} else {
#ifdef DEBUG_ESP_MDNS_ERR
DEBUG_ESP_PORT.printf("ERR_PROTO: %s\n", protoName);
#endif
_conn->flush();
return;
}
}
if(!localParsed){
char localName[32];
uint8_t localNameLen = _conn_read8() % 31;
_conn_readS(localName, localNameLen);
localName[localNameLen] = '\0';
tmp = _conn_read8();
if(localNameLen == 5 && strcmp("local", localName) == 0 && tmp == 0){
localParsed = true;
} else {
#ifdef DEBUG_ESP_MDNS_ERR
DEBUG_ESP_PORT.printf("ERR_FQDN: %s\n", localName);
#endif
_conn->flush();
return;
}
}
if(serviceNameLen > 0 && protoNameLen > 0){
servicePort = _getServicePort(serviceName, protoName);
if(servicePort == 0){
#ifdef DEBUG_ESP_MDNS_ERR
DEBUG_ESP_PORT.printf("ERR_NO_SERVICE: %s\n", serviceName);
#endif
_conn->flush();
return;
}
} else if(serviceNameLen > 0 || protoNameLen > 0){
#ifdef DEBUG_ESP_MDNS_ERR
DEBUG_ESP_PORT.printf("ERR_SERVICE_PROTO: %s\n", serviceName);
#endif
_conn->flush();
return;
}
// RESPOND
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("RX: REQ, ID:%u, Q:%u, A:%u, NS:%u, ADD:%u\n", packetHeader[0], packetHeader[2], packetHeader[3], packetHeader[4], packetHeader[5]);
#endif
uint16_t currentType;
uint16_t currentClass;
int numQuestions = packetHeader[2];
if(numQuestions > 4) numQuestions = 4;
uint16_t questions[4];
int question = 0;
while(numQuestions--){
currentType = _conn_read16();
if(currentType & MDNS_NAME_REF){ //new header handle it better!
currentType = _conn_read16();
}
currentClass = _conn_read16();
if(currentClass & MDNS_CLASS_IN) questions[question++] = currentType;
if(numQuestions > 0){
if(_conn_read16() != 0xC00C){//new question but for another host/service
_conn->flush();
numQuestions = 0;
}
}
#ifdef DEBUG_ESP_MDNS_RX
DEBUG_ESP_PORT.printf("REQ: ");
if(hostNameLen > 0)
DEBUG_ESP_PORT.printf("%s.", hostName);
if(serviceNameLen > 0)
DEBUG_ESP_PORT.printf("_%s.", serviceName);
if(protoNameLen > 0)
DEBUG_ESP_PORT.printf("_%s.", protoName);
DEBUG_ESP_PORT.printf("local. ");
if(currentType == MDNS_TYPE_AAAA)
DEBUG_ESP_PORT.printf(" AAAA ");
else if(currentType == MDNS_TYPE_A)
DEBUG_ESP_PORT.printf(" A ");
else if(currentType == MDNS_TYPE_PTR)
DEBUG_ESP_PORT.printf(" PTR ");
else if(currentType == MDNS_TYPE_SRV)
DEBUG_ESP_PORT.printf(" SRV ");
else if(currentType == MDNS_TYPE_TXT)
DEBUG_ESP_PORT.printf(" TXT ");
else
DEBUG_ESP_PORT.printf(" 0x%04X ", currentType);
if(currentClass == MDNS_CLASS_IN)
DEBUG_ESP_PORT.printf(" IN ");
else if(currentClass == MDNS_CLASS_IN_FLUSH_CACHE)
DEBUG_ESP_PORT.printf(" IN[F] ");
else
DEBUG_ESP_PORT.printf(" 0x%04X ", currentClass);
DEBUG_ESP_PORT.printf("\n");
#endif
}
uint8_t questionMask = 0;
uint8_t responseMask = 0;
for(i=0;i<question;i++){
if(questions[i] == MDNS_TYPE_A) {
questionMask |= 0x1;
responseMask |= 0x1;
} else if(questions[i] == MDNS_TYPE_SRV) {
questionMask |= 0x2;
responseMask |= 0x3;
} else if(questions[i] == MDNS_TYPE_TXT) {
questionMask |= 0x4;
responseMask |= 0x4;
} else if(questions[i] == MDNS_TYPE_PTR) {
questionMask |= 0x8;
responseMask |= 0xF;
}
}
IPAddress interface = _getRequestMulticastInterface();
return _replyToInstanceRequest(questionMask, responseMask, serviceName, protoName, servicePort, interface);
}
/**
* STRINGIZE
*/
#ifndef STRINGIZE
#define STRINGIZE(x) #x
#endif
#ifndef STRINGIZE_VALUE_OF
#define STRINGIZE_VALUE_OF(x) STRINGIZE(x)
#endif
void MDNSResponder::enableArduino(uint16_t port, bool auth){
addService("arduino", "tcp", port);
addServiceTxt("arduino", "tcp", "tcp_check", "no");
addServiceTxt("arduino", "tcp", "ssh_upload", "no");
addServiceTxt("arduino", "tcp", "board", STRINGIZE_VALUE_OF(ARDUINO_BOARD));
addServiceTxt("arduino", "tcp", "auth_upload", (auth) ? "yes":"no");
}
void MDNSResponder::_replyToTypeEnumRequest(IPAddress multicastInterface) {
MDNSService* servicePtr;
for (servicePtr = _services; servicePtr; servicePtr = servicePtr->_next) {
if(servicePtr->_port > 0){
char *service = servicePtr->_name;
char *proto = servicePtr->_proto;
//uint16_t port = servicePtr->_port;
#ifdef DEBUG_ESP_MDNS_TX
DEBUG_ESP_PORT.printf("TX: service:%s, proto:%s\n", service, proto);