forked from Haivision/srt
-
Notifications
You must be signed in to change notification settings - Fork 1
/
transmitmedia.cpp
1244 lines (1036 loc) · 35.4 KB
/
transmitmedia.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
/*
* SRT - Secure, Reliable, Transport
* Copyright (c) 2018 Haivision Systems Inc.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
// Just for formality. This file should be used
#include <iostream>
#include <iomanip>
#include <fstream>
#include <sstream>
#include <memory>
#include <string>
#include <stdexcept>
#include <iterator>
#include <map>
#include <srt.h>
#if !defined(_WIN32)
#include <sys/ioctl.h>
#else
#include <fcntl.h>
#include <io.h>
#endif
#if defined(SUNOS)
#include <sys/filio.h>
#endif
#include "netinet_any.h"
#include "apputil.hpp"
#include "socketoptions.hpp"
#include "uriparser.hpp"
#include "transmitmedia.hpp"
#include "srt_compat.h"
#include "verbose.hpp"
using namespace std;
using namespace srt;
bool g_stats_are_printed_to_stdout = false;
bool transmit_total_stats = false;
unsigned long transmit_bw_report = 0;
unsigned long transmit_stats_report = 0;
unsigned long transmit_chunk_size = SRT_LIVE_MAX_PLSIZE;
class FileSource: public Source
{
ifstream ifile;
string filename_copy;
public:
FileSource(const string& path): ifile(path, ios::in | ios::binary), filename_copy(path)
{
if ( !ifile )
throw std::runtime_error(path + ": Can't open file for reading");
}
int Read(size_t chunk, MediaPacket& pkt, ostream & ignored SRT_ATR_UNUSED = cout) override
{
if (pkt.payload.size() < chunk)
pkt.payload.resize(chunk);
pkt.time = 0;
ifile.read(pkt.payload.data(), chunk);
size_t nread = ifile.gcount();
if (nread < pkt.payload.size())
pkt.payload.resize(nread);
if (pkt.payload.empty())
{
return 0;
}
return (int) nread;
}
bool IsOpen() override { return bool(ifile); }
bool End() override { return ifile.eof(); }
};
class FileTarget: public Target
{
ofstream ofile;
public:
FileTarget(const string& path): ofile(path, ios::out | ios::trunc | ios::binary) {}
int Write(const char* data, size_t size, int64_t time SRT_ATR_UNUSED, ostream & ignored SRT_ATR_UNUSED = cout) override
{
ofile.write(data, size);
return !(ofile.bad()) ? (int) size : 0;
}
bool IsOpen() override { return !!ofile; }
bool Broken() override { return !ofile.good(); }
//~FileTarget() { ofile.close(); }
void Close() override { ofile.close(); }
};
template <class Iface> struct File;
template <> struct File<Source> { typedef FileSource type; };
template <> struct File<Target> { typedef FileTarget type; };
template <class Iface>
Iface* CreateFile(const string& name) { return new typename File<Iface>::type (name); }
shared_ptr<SrtStatsWriter> transmit_stats_writer;
void SrtCommon::InitParameters(string host, map<string,string> par)
{
// Application-specific options: mode, blocking, timeout, adapter
if (Verbose::on && !par.empty())
{
Verb() << "SRT parameters specified:\n";
for (map<string,string>::iterator i = par.begin(); i != par.end(); ++i)
{
cerr << "\t" << i->first << " = '" << i->second << "'\n";
}
}
if (par.count("bind"))
{
string bindspec = par.at("bind");
UriParser u (bindspec, UriParser::EXPECT_HOST);
if ( u.scheme() != ""
|| u.path() != ""
|| !u.parameters().empty()
|| u.portno() == 0)
{
Error("Invalid syntax in 'bind' option");
}
if (u.host() != "")
par["adapter"] = u.host();
par["port"] = u.port();
par.erase("bind");
}
string adapter;
if (par.count("adapter"))
{
adapter = par.at("adapter");
}
m_mode = "default";
if (par.count("mode"))
{
m_mode = par.at("mode");
}
SocketOption::Mode mode = SrtInterpretMode(m_mode, host, adapter);
if (mode == SocketOption::FAILURE)
{
Error("Invalid mode");
}
// Fix the mode name after successful interpretation
m_mode = SocketOption::mode_names[mode];
par.erase("mode");
if (par.count("timeout"))
{
m_timeout = stoi(par.at("timeout"), 0, 0);
par.erase("timeout");
}
if (par.count("adapter"))
{
m_adapter = par.at("adapter");
par.erase("adapter");
}
else if (m_mode == "listener")
{
// For listener mode, adapter is taken from host,
// if 'adapter' parameter is not given
m_adapter = host;
}
if (par.count("tsbpd") && false_names.count(par.at("tsbpd")))
{
m_tsbpdmode = false;
}
if (par.count("port"))
{
m_outgoing_port = stoi(par.at("port"), 0, 0);
par.erase("port");
}
// That's kinda clumsy, but it must rely on the defaults.
// Default mode is live, so check if the file mode was enforced
if ((par.count("transtype") == 0 || par["transtype"] != "file")
&& transmit_chunk_size > SRT_LIVE_DEF_PLSIZE)
{
if (transmit_chunk_size > SRT_LIVE_MAX_PLSIZE)
throw std::runtime_error("Chunk size in live mode exceeds 1456 bytes; this is not supported");
par["payloadsize"] = Sprint(transmit_chunk_size);
}
// Assign the others here.
m_options = par;
}
void SrtCommon::PrepareListener(string host, int port, int backlog)
{
m_bindsock = srt_create_socket();
if ( m_bindsock == SRT_ERROR )
Error("srt_create_socket");
int stat = ConfigurePre(m_bindsock);
if ( stat == SRT_ERROR )
Error("ConfigurePre");
sockaddr_any sa = CreateAddr(host, port);
sockaddr* psa = sa.get();
Verb() << "Binding a server on " << host << ":" << port << " ...";
stat = srt_bind(m_bindsock, psa, sizeof sa);
if ( stat == SRT_ERROR )
{
srt_close(m_bindsock);
Error("srt_bind");
}
Verb() << " listen...";
stat = srt_listen(m_bindsock, backlog);
if ( stat == SRT_ERROR )
{
srt_close(m_bindsock);
Error("srt_listen");
}
}
void SrtCommon::StealFrom(SrtCommon& src)
{
// This is used when SrtCommon class designates a listener
// object that is doing Accept in appropriate direction class.
// The new object should get the accepted socket.
m_output_direction = src.m_output_direction;
m_timeout = src.m_timeout;
m_tsbpdmode = src.m_tsbpdmode;
m_options = src.m_options;
m_bindsock = SRT_INVALID_SOCK; // no listener
m_sock = src.m_sock;
src.m_sock = SRT_INVALID_SOCK; // STEALING
}
bool SrtCommon::AcceptNewClient()
{
sockaddr_any scl;
Verb() << " accept... ";
m_sock = srt_accept(m_bindsock, scl.get(), &scl.len);
if ( m_sock == SRT_INVALID_SOCK )
{
srt_close(m_bindsock);
m_bindsock = SRT_INVALID_SOCK;
Error("srt_accept");
}
// we do one client connection at a time,
// so close the listener.
srt_close(m_bindsock);
m_bindsock = SRT_INVALID_SOCK;
Verb() << " connected.";
// ConfigurePre is done on bindsock, so any possible Pre flags
// are DERIVED by sock. ConfigurePost is done exclusively on sock.
int stat = ConfigurePost(m_sock);
if ( stat == SRT_ERROR )
Error("ConfigurePost");
return true;
}
void SrtCommon::Init(string host, int port, map<string,string> par, bool dir_output)
{
m_output_direction = dir_output;
InitParameters(host, par);
Verb() << "Opening SRT " << (dir_output ? "target" : "source") << " " << m_mode
<< " on " << host << ":" << port;
if ( m_mode == "caller" )
OpenClient(host, port);
else if ( m_mode == "listener" )
OpenServer(m_adapter, port);
else if ( m_mode == "rendezvous" )
OpenRendezvous(m_adapter, host, port);
else
{
throw std::invalid_argument("Invalid 'mode'. Use 'client' or 'server'");
}
}
int SrtCommon::ConfigurePost(SRTSOCKET sock)
{
bool no = false;
int result = 0;
if ( m_output_direction )
{
result = srt_setsockopt(sock, 0, SRTO_SNDSYN, &no, sizeof no);
if ( result == -1 )
return result;
if ( m_timeout )
return srt_setsockopt(sock, 0, SRTO_SNDTIMEO, &m_timeout, sizeof m_timeout);
}
else
{
result = srt_setsockopt(sock, 0, SRTO_RCVSYN, &no, sizeof no);
if ( result == -1 )
return result;
if ( m_timeout )
return srt_setsockopt(sock, 0, SRTO_RCVTIMEO, &m_timeout, sizeof m_timeout);
}
SrtConfigurePost(sock, m_options);
for (const auto &o: srt_options)
{
if ( o.binding == SocketOption::POST && m_options.count(o.name) )
{
string value = m_options.at(o.name);
bool ok = o.apply<SocketOption::SRT>(sock, value);
if ( !ok )
Verb() << "WARNING: failed to set '" << o.name << "' (post, "
<< (m_output_direction? "target":"source") << ") to "
<< value;
else
Verb() << "NOTE: SRT/post::" << o.name << "=" << value;
}
}
return 0;
}
int SrtCommon::ConfigurePre(SRTSOCKET sock)
{
int result = 0;
bool no = false;
if ( !m_tsbpdmode )
{
result = srt_setsockopt(sock, 0, SRTO_TSBPDMODE, &no, sizeof no);
if ( result == -1 )
return result;
}
result = srt_setsockopt(sock, 0, SRTO_RCVSYN, &no, sizeof no);
if ( result == -1 )
return result;
// host is only checked for emptiness and depending on that the connection mode is selected.
// Here we are not exactly interested with that information.
vector<string> failures;
// NOTE: here host = "", so the 'connmode' will be returned as LISTENER always,
// but it doesn't matter here. We don't use 'connmode' for anything else than
// checking for failures.
SocketOption::Mode conmode = SrtConfigurePre(sock, "", m_options, &failures);
if ( conmode == SocketOption::FAILURE )
{
if ( Verbose::on )
{
cerr << "WARNING: failed to set options: ";
copy(failures.begin(), failures.end(), ostream_iterator<string>(cerr, ", "));
cerr << endl;
}
return SRT_ERROR;
}
return 0;
}
void SrtCommon::SetupAdapter(const string& host, int port)
{
sockaddr_any localsa = CreateAddr(host, port);
sockaddr* psa = localsa.get();
int stat = srt_bind(m_sock, psa, sizeof localsa);
if ( stat == SRT_ERROR )
Error("srt_bind");
}
void SrtCommon::OpenClient(string host, int port)
{
PrepareClient();
if (m_outgoing_port || m_adapter != "")
{
SetupAdapter(m_adapter, m_outgoing_port);
}
ConnectClient(host, port);
}
void SrtCommon::PrepareClient()
{
m_sock = srt_create_socket();
if ( m_sock == SRT_ERROR )
Error("srt_create_socket");
int stat = ConfigurePre(m_sock);
if ( stat == SRT_ERROR )
Error("ConfigurePre");
}
void SrtCommon::ConnectClient(string host, int port)
{
sockaddr_any sa = CreateAddr(host, port);
sockaddr* psa = sa.get();
Verb() << "Connecting to " << host << ":" << port;
int stat = srt_connect(m_sock, psa, sizeof sa);
if ( stat == SRT_ERROR )
{
srt_close(m_sock);
Error("srt_connect");
}
stat = ConfigurePost(m_sock);
if ( stat == SRT_ERROR )
Error("ConfigurePost");
}
void SrtCommon::Error(string src)
{
int errnov = 0;
int result = srt_getlasterror(&errnov);
string message = srt_getlasterror_str();
Verb() << "\nERROR #" << result << "." << errnov << ": " << message;
throw TransmissionError("error: " + src + ": " + message);
}
void SrtCommon::OpenRendezvous(string adapter, string host, int port)
{
m_sock = srt_create_socket();
if ( m_sock == SRT_ERROR )
Error("srt_create_socket");
bool yes = true;
srt_setsockopt(m_sock, 0, SRTO_RENDEZVOUS, &yes, sizeof yes);
int stat = ConfigurePre(m_sock);
if ( stat == SRT_ERROR )
Error("ConfigurePre");
sockaddr_any sa = CreateAddr(host, port);
if (sa.family() == AF_UNSPEC)
{
Error("OpenRendezvous: invalid target host specification: " + host);
}
const int outport = m_outgoing_port ? m_outgoing_port : port;
sockaddr_any localsa = CreateAddr(adapter, outport, sa.family());
Verb() << "Binding a server on " << adapter << ":" << outport;
stat = srt_bind(m_sock, localsa.get(), sizeof localsa);
if ( stat == SRT_ERROR )
{
srt_close(m_sock);
Error("srt_bind");
}
Verb() << "Connecting to " << host << ":" << port;
stat = srt_connect(m_sock, sa.get(), sizeof sa);
if ( stat == SRT_ERROR )
{
srt_close(m_sock);
Error("srt_connect");
}
stat = ConfigurePost(m_sock);
if ( stat == SRT_ERROR )
Error("ConfigurePost");
}
void SrtCommon::Close()
{
Verb() << "SrtCommon: DESTROYING CONNECTION, closing sockets (rt%" << m_sock << " ls%" << m_bindsock << ")...";
if ( m_sock != SRT_INVALID_SOCK )
{
srt_close(m_sock);
m_sock = SRT_INVALID_SOCK;
}
if ( m_bindsock != SRT_INVALID_SOCK )
{
srt_close(m_bindsock);
m_bindsock = SRT_INVALID_SOCK ;
}
Verb() << "SrtCommon: ... done.";
}
SrtCommon::~SrtCommon()
{
Close();
}
SrtSource::SrtSource(string host, int port, const map<string,string>& par)
{
Init(host, port, par, false);
ostringstream os;
os << host << ":" << port;
hostport_copy = os.str();
}
int SrtSource::Read(size_t chunk, MediaPacket& pkt, ostream &out_stats)
{
static unsigned long counter = 1;
if (pkt.payload.size() < chunk)
pkt.payload.resize(chunk);
SRT_MSGCTRL ctrl;
const int stat = srt_recvmsg2(m_sock, pkt.payload.data(), (int) chunk, &ctrl);
if (stat <= 0)
{
pkt.payload.clear();
return stat;
}
pkt.time = ctrl.srctime;
chunk = size_t(stat);
if (chunk < pkt.payload.size())
pkt.payload.resize(chunk);
const bool need_bw_report = transmit_bw_report && (counter % transmit_bw_report) == transmit_bw_report - 1;
const bool need_stats_report = transmit_stats_report && (counter % transmit_stats_report) == transmit_stats_report - 1;
if (need_bw_report || need_stats_report)
{
CBytePerfMon perf;
srt_bstats(m_sock, &perf, need_stats_report && !transmit_total_stats);
if (transmit_stats_writer != nullptr)
{
if (need_bw_report)
cerr << transmit_stats_writer->WriteBandwidth(perf.mbpsBandwidth) << std::flush;
if (need_stats_report)
out_stats << transmit_stats_writer->WriteStats(m_sock, perf) << std::flush;
}
}
++counter;
return stat;
}
int SrtTarget::ConfigurePre(SRTSOCKET sock)
{
int result = SrtCommon::ConfigurePre(sock);
if ( result == -1 )
return result;
int yes = 1;
// This is for the HSv4 compatibility; if both parties are HSv5
// (min. version 1.2.1), then this setting simply does nothing.
// In HSv4 this setting is obligatory; otherwise the SRT handshake
// extension will not be done at all.
result = srt_setsockopt(sock, 0, SRTO_SENDER, &yes, sizeof yes);
if ( result == -1 )
return result;
return 0;
}
int SrtTarget::Write(const char* data, size_t size, int64_t src_time, ostream &out_stats)
{
static unsigned long counter = 1;
SRT_MSGCTRL ctrl = srt_msgctrl_default;
ctrl.srctime = src_time;
int stat = srt_sendmsg2(m_sock, data, (int) size, &ctrl);
if (stat == SRT_ERROR)
{
return stat;
}
const bool need_bw_report = transmit_bw_report && (counter % transmit_bw_report) == transmit_bw_report - 1;
const bool need_stats_report = transmit_stats_report && (counter % transmit_stats_report) == transmit_stats_report - 1;
if (need_bw_report || need_stats_report)
{
CBytePerfMon perf;
srt_bstats(m_sock, &perf, need_stats_report && !transmit_total_stats);
if (transmit_stats_writer != nullptr)
{
if (need_bw_report)
cerr << transmit_stats_writer->WriteBandwidth(perf.mbpsBandwidth) << std::flush;
if (need_stats_report)
out_stats << transmit_stats_writer->WriteStats(m_sock, perf) << std::flush;
}
}
++counter;
return stat;
}
SrtModel::SrtModel(string host, int port, map<string,string> par)
{
InitParameters(host, par);
if (m_mode == "caller")
is_caller = true;
else if (m_mode != "listener")
throw std::invalid_argument("Only caller and listener modes supported");
m_host = host;
m_port = port;
}
void SrtModel::Establish(std::string& w_name)
{
// This does connect or accept.
// When this returned true, the caller should create
// a new SrtSource or SrtTaget then call StealFrom(*this) on it.
// If this is a connector and the peer doesn't have a corresponding
// medium, it should send back a single byte with value 0. This means
// that agent should stop connecting.
if (is_caller)
{
// Establish a connection
PrepareClient();
if (w_name != "")
{
Verb() << "Connect with requesting stream [" << w_name << "]";
srt::setstreamid(m_sock, w_name);
}
else
{
Verb() << "NO STREAM ID for SRT connection";
}
if (m_outgoing_port)
{
Verb() << "Setting outgoing port: " << m_outgoing_port;
SetupAdapter("", m_outgoing_port);
}
ConnectClient(m_host, m_port);
if (m_outgoing_port == 0)
{
// Must rely on a randomly selected one. Extract the port
// so that it will be reused next time.
sockaddr_any s(AF_INET);
int namelen = s.size();
if ( srt_getsockname(Socket(), s.get(), &namelen) == SRT_ERROR )
{
Error("srt_getsockname");
}
m_outgoing_port = s.hport();
Verb() << "Extracted outgoing port: " << m_outgoing_port;
}
}
else
{
// Listener - get a socket by accepting.
// Check if the listener is already created first
if (Listener() == SRT_INVALID_SOCK)
{
Verb() << "Setting up listener: port=" << m_port << " backlog=5";
PrepareListener(m_adapter, m_port, 5);
}
Verb() << "Accepting a client...";
AcceptNewClient();
// This rewrites m_sock with a new SRT socket ("accepted" socket)
w_name = srt::getstreamid(m_sock);
Verb() << "... GOT CLIENT for stream [" << w_name << "]";
}
}
template <class Iface> struct Srt;
template <> struct Srt<Source> { typedef SrtSource type; };
template <> struct Srt<Target> { typedef SrtTarget type; };
template <class Iface>
Iface* CreateSrt(const string& host, int port, const map<string,string>& par) { return new typename Srt<Iface>::type (host, port, par); }
class ConsoleSource: public Source
{
public:
ConsoleSource()
{
#ifdef _WIN32
// The default stdin mode on windows is text.
// We have to set it to the binary mode
_setmode(_fileno(stdin), _O_BINARY);
#endif
}
int Read(size_t chunk, MediaPacket& pkt, ostream & ignored SRT_ATR_UNUSED = cout) override
{
if (pkt.payload.size() < chunk)
pkt.payload.resize(chunk);
bool st = cin.read(pkt.payload.data(), chunk).good();
chunk = cin.gcount();
if (chunk == 0 || !st)
{
pkt.payload.clear();
return 0;
}
// Save this time to potentially use it for SRT target.
pkt.time = srt_time_now();
if (chunk < pkt.payload.size())
pkt.payload.resize(chunk);
return (int) chunk;
}
bool IsOpen() override { return cin.good(); }
bool End() override { return cin.eof(); }
int GetSysSocket() const override { return 0; };
};
class ConsoleTarget: public Target
{
public:
ConsoleTarget()
{
#ifdef _WIN32
// The default stdout mode on windows is text.
// We have to set it to the binary mode
_setmode(_fileno(stdout), _O_BINARY);
#endif
}
virtual ~ConsoleTarget()
{
cout.flush();
}
int Write(const char* data, size_t len, int64_t src_time SRT_ATR_UNUSED, ostream & ignored SRT_ATR_UNUSED = cout) override
{
cout.write(data, len);
return (int) len;
}
bool IsOpen() override { return cout.good(); }
bool Broken() override { return cout.eof(); }
int GetSysSocket() const override { return 0; };
};
template <class Iface> struct Console;
template <> struct Console<Source> { typedef ConsoleSource type; };
template <> struct Console<Target> { typedef ConsoleTarget type; };
template <class Iface>
Iface* CreateConsole() { return new typename Console<Iface>::type (); }
// More options can be added in future.
SocketOption udp_options [] {
{ "iptos", IPPROTO_IP, IP_TOS, SocketOption::PRE, SocketOption::INT, nullptr },
// IP_TTL and IP_MULTICAST_TTL are handled separately by a common option, "ttl".
{ "mcloop", IPPROTO_IP, IP_MULTICAST_LOOP, SocketOption::PRE, SocketOption::INT, nullptr },
{ "sndbuf", SOL_SOCKET, SO_SNDBUF, SocketOption::PRE, SocketOption::INT, nullptr},
{ "rcvbuf", SOL_SOCKET, SO_RCVBUF, SocketOption::PRE, SocketOption::INT, nullptr}
};
static inline bool IsMulticast(in_addr adr)
{
unsigned char* abytes = (unsigned char*)&adr.s_addr;
unsigned char c = abytes[0];
return c >= 224 && c <= 239;
}
class UdpCommon
{
protected:
int m_sock = -1;
sockaddr_any sadr;
string adapter;
map<string, string> m_options;
void Setup(string host, int port, map<string,string> attr)
{
m_sock = (int)socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (m_sock == -1)
Error(SysError(), "UdpCommon::Setup: socket");
int yes = 1;
::setsockopt(m_sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&yes, sizeof yes);
// set non-blocking mode
#if defined(_WIN32)
unsigned long ulyes = 1;
if (ioctlsocket(m_sock, FIONBIO, &ulyes) == SOCKET_ERROR)
#else
if (ioctl(m_sock, FIONBIO, (const char *)&yes) < 0)
#endif
{
Error(SysError(), "UdpCommon::Setup: ioctl FIONBIO");
}
sadr = CreateAddr(host, port);
bool is_multicast = false;
if (attr.count("multicast"))
{
// XXX: Here provide support for IPv6 multicast #1479
if (sadr.family() != AF_INET)
{
throw std::runtime_error("UdpCommon: Multicast on IPv6 is not yet supported");
}
if (!IsMulticast(sadr.sin.sin_addr))
{
throw std::runtime_error("UdpCommon: requested multicast for a non-multicast-type IP address");
}
is_multicast = true;
}
else if (sadr.family() == AF_INET && IsMulticast(sadr.sin.sin_addr))
{
is_multicast = true;
}
if (is_multicast)
{
ip_mreq mreq;
sockaddr_any maddr (AF_INET);
int opt_name;
void* mreq_arg_ptr;
socklen_t mreq_arg_size;
adapter = attr.count("adapter") ? attr.at("adapter") : string();
if ( adapter == "" )
{
Verb() << "Multicast: home address: INADDR_ANY:" << port;
maddr.sin.sin_family = AF_INET;
maddr.sin.sin_addr.s_addr = htonl(INADDR_ANY);
maddr.sin.sin_port = htons(port); // necessary for temporary use
}
else
{
Verb() << "Multicast: home address: " << adapter << ":" << port;
maddr = CreateAddr(adapter, port);
}
if (attr.count("source"))
{
#ifdef IP_ADD_SOURCE_MEMBERSHIP
ip_mreq_source mreq_ssm;
/* this is an ssm. we need to use the right struct and opt */
opt_name = IP_ADD_SOURCE_MEMBERSHIP;
mreq_ssm.imr_multiaddr.s_addr = sadr.sin.sin_addr.s_addr;
mreq_ssm.imr_interface.s_addr = maddr.sin.sin_addr.s_addr;
inet_pton(AF_INET, attr.at("source").c_str(), &mreq_ssm.imr_sourceaddr);
mreq_arg_size = sizeof(mreq_ssm);
mreq_arg_ptr = &mreq_ssm;
#else
throw std::runtime_error("UdpCommon: source-filter multicast not supported by OS");
#endif
}
else
{
opt_name = IP_ADD_MEMBERSHIP;
mreq.imr_multiaddr.s_addr = sadr.sin.sin_addr.s_addr;
mreq.imr_interface.s_addr = maddr.sin.sin_addr.s_addr;
mreq_arg_size = sizeof(mreq);
mreq_arg_ptr = &mreq;
}
#ifdef _WIN32
const char* mreq_arg = (const char*)mreq_arg_ptr;
const auto status_error = SOCKET_ERROR;
#else
const void* mreq_arg = mreq_arg_ptr;
const auto status_error = -1;
#endif
#if defined(_WIN32) || defined(__CYGWIN__)
// On Windows it somehow doesn't work when bind()
// is called with multicast address. Write the address
// that designates the network device here.
// Also, sets port sharing when working with multicast
sadr = maddr;
int reuse = 1;
int shareAddrRes = setsockopt(m_sock, SOL_SOCKET, SO_REUSEADDR, reinterpret_cast<const char*>(&reuse), sizeof(reuse));
if (shareAddrRes == status_error)
{
throw runtime_error("marking socket for shared use failed");
}
Verb() << "Multicast(Windows): will bind to home address";
#else
Verb() << "Multicast(POSIX): will bind to IGMP address: " << host;
#endif
int res = setsockopt(m_sock, IPPROTO_IP, opt_name, mreq_arg, mreq_arg_size);
if ( res == status_error )
{
Error(errno, "adding to multicast membership failed");
}
attr.erase("multicast");
attr.erase("adapter");
}
// The "ttl" options is handled separately, it maps to both IP_TTL
// and IP_MULTICAST_TTL so that TTL setting works for both uni- and multicast.
if (attr.count("ttl"))
{
int ttl = stoi(attr.at("ttl"));
int res = setsockopt(m_sock, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof ttl);
if (res == -1)
Verb() << "WARNING: failed to set 'ttl' (IP_TTL) to " << ttl;
res = setsockopt(m_sock, IPPROTO_IP, IP_MULTICAST_TTL, (const char*)&ttl, sizeof ttl);
if (res == -1)
Verb() << "WARNING: failed to set 'ttl' (IP_MULTICAST_TTL) to " << ttl;
attr.erase("ttl");
}
m_options = attr;
for (auto o: udp_options)
{
// Ignore "binding" - for UDP there are no post options.
if ( m_options.count(o.name) )
{
string value = m_options.at(o.name);
bool ok = o.apply<SocketOption::SYSTEM>(m_sock, value);
if ( !ok )
Verb() << "WARNING: failed to set '" << o.name << "' to " << value;
}
}
}
void Error(int err, string src)
{
char buf[512];
string message = SysStrError(err, buf, 512u);
cerr << "\nERROR #" << err << ": " << message << endl;
throw TransmissionError("error: " + src + ": " + message);
}
~UdpCommon()
{
#ifdef _WIN32
if (m_sock != -1)
{
shutdown(m_sock, SD_BOTH);
closesocket(m_sock);
m_sock = -1;
}
#else
close(m_sock);
#endif
}
};
class UdpSource: public Source, public UdpCommon
{
protected:
bool eof = true;
public:
UdpSource(string host, int port, const map<string,string>& attr)
{
Setup(host, port, attr);
int stat = ::bind(m_sock, sadr.get(), sadr.size());
if ( stat == -1 )
Error(SysError(), "Binding address for UDP");
eof = false;
}