summaryrefslogtreecommitdiffstats
path: root/lib/ngtcp2_log.c
blob: 28f3c93eb7eb49c96a4d5b658907081c69498452 (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
/*
 * ngtcp2
 *
 * Copyright (c) 2018 ngtcp2 contributors
 *
 * 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.
 */
#include "ngtcp2_log.h"

#include <stdio.h>
#ifdef HAVE_UNISTD_H
#  include <unistd.h>
#endif
#include <assert.h>
#include <string.h>

#include "ngtcp2_str.h"
#include "ngtcp2_vec.h"
#include "ngtcp2_macro.h"
#include "ngtcp2_conv.h"
#include "ngtcp2_unreachable.h"
#include "ngtcp2_net.h"

void ngtcp2_log_init(ngtcp2_log *log, const ngtcp2_cid *scid,
                     ngtcp2_printf log_printf, ngtcp2_tstamp ts,
                     void *user_data) {
  if (scid) {
    ngtcp2_encode_hex(log->scid, scid->data, scid->datalen);
  } else {
    log->scid[0] = '\0';
  }
  log->log_printf = log_printf;
  log->ts = log->last_ts = ts;
  log->user_data = user_data;
}

/*
 * # Log header
 *
 * <LEVEL><TIMESTAMP> <SCID> <EVENT>
 *
 * <LEVEL>:
 *   Log level.  I=Info, W=Warning, E=Error
 *
 * <TIMESTAMP>:
 *   Timestamp relative to ngtcp2_log.ts field in milliseconds
 *   resolution.
 *
 * <SCID>:
 *   Source Connection ID in hex string.
 *
 * <EVENT>:
 *   Event.  pkt=packet, frm=frame, rcv=recovery, cry=crypto,
 *   con=connection(catch all)
 *
 * # Frame event
 *
 * <DIR> <PKN> <PKTNAME> <FRAMENAME>(<FRAMETYPE>)
 *
 * <DIR>:
 *   Flow direction.  tx=transmission, rx=reception
 *
 * <PKN>:
 *   Packet number.
 *
 * <PKTNAME>:
 *   Packet name.  (e.g., Initial, Handshake, 1RTT)
 *
 * <FRAMENAME>:
 *   Frame name.  (e.g., STREAM, ACK, PING)
 *
 * <FRAMETYPE>:
 *   Frame type in hex string.
 */

#define NGTCP2_LOG_BUFLEN 4096

/* TODO Split second and remaining fraction with comma */
#define NGTCP2_LOG_HD "I%08" PRIu64 " 0x%s %s"
#define NGTCP2_LOG_PKT NGTCP2_LOG_HD " %s %" PRId64 " %s"
#define NGTCP2_LOG_TP NGTCP2_LOG_HD " remote transport_parameters"

#define NGTCP2_LOG_FRM_HD_FIELDS(DIR)                                          \
  timestamp_cast(log->last_ts - log->ts), (const char *)log->scid, "frm",      \
      (DIR), hd->pkt_num, strpkttype(hd)

#define NGTCP2_LOG_PKT_HD_FIELDS(DIR)                                          \
  timestamp_cast(log->last_ts - log->ts), (const char *)log->scid, "pkt",      \
      (DIR), hd->pkt_num, strpkttype(hd)

#define NGTCP2_LOG_TP_HD_FIELDS                                                \
  timestamp_cast(log->last_ts - log->ts), (const char *)log->scid, "cry"

static const char *strerrorcode(uint64_t error_code) {
  switch (error_code) {
  case NGTCP2_NO_ERROR:
    return "NO_ERROR";
  case NGTCP2_INTERNAL_ERROR:
    return "INTERNAL_ERROR";
  case NGTCP2_CONNECTION_REFUSED:
    return "CONNECTION_REFUSED";
  case NGTCP2_FLOW_CONTROL_ERROR:
    return "FLOW_CONTROL_ERROR";
  case NGTCP2_STREAM_LIMIT_ERROR:
    return "STREAM_LIMIT_ERROR";
  case NGTCP2_STREAM_STATE_ERROR:
    return "STREAM_STATE_ERROR";
  case NGTCP2_FINAL_SIZE_ERROR:
    return "FINAL_SIZE_ERROR";
  case NGTCP2_FRAME_ENCODING_ERROR:
    return "FRAME_ENCODING_ERROR";
  case NGTCP2_TRANSPORT_PARAMETER_ERROR:
    return "TRANSPORT_PARAMETER_ERROR";
  case NGTCP2_CONNECTION_ID_LIMIT_ERROR:
    return "CONNECTION_ID_LIMIT_ERROR";
  case NGTCP2_PROTOCOL_VIOLATION:
    return "PROTOCOL_VIOLATION";
  case NGTCP2_INVALID_TOKEN:
    return "INVALID_TOKEN";
  case NGTCP2_APPLICATION_ERROR:
    return "APPLICATION_ERROR";
  case NGTCP2_CRYPTO_BUFFER_EXCEEDED:
    return "CRYPTO_BUFFER_EXCEEDED";
  case NGTCP2_KEY_UPDATE_ERROR:
    return "KEY_UPDATE_ERROR";
  case NGTCP2_VERSION_NEGOTIATION_ERROR_DRAFT:
    return "VERSION_NEGOTIATION_ERROR";
  default:
    if (0x100u <= error_code && error_code <= 0x1ffu) {
      return "CRYPTO_ERROR";
    }
    return "(unknown)";
  }
}

static const char *strapperrorcode(uint64_t app_error_code) {
  (void)app_error_code;
  return "(unknown)";
}

static const char *strpkttype_long(uint8_t type) {
  switch (type) {
  case NGTCP2_PKT_INITIAL:
    return "Initial";
  case NGTCP2_PKT_RETRY:
    return "Retry";
  case NGTCP2_PKT_HANDSHAKE:
    return "Handshake";
  case NGTCP2_PKT_0RTT:
    return "0RTT";
  default:
    return "(unknown)";
  }
}

static const char *strpkttype(const ngtcp2_pkt_hd *hd) {
  if (hd->flags & NGTCP2_PKT_FLAG_LONG_FORM) {
    return strpkttype_long(hd->type);
  }

  switch (hd->type) {
  case NGTCP2_PKT_VERSION_NEGOTIATION:
    return "VN";
  case NGTCP2_PKT_STATELESS_RESET:
    return "SR";
  case NGTCP2_PKT_1RTT:
    return "1RTT";
  default:
    return "(unknown)";
  }
}

static const char *strpkttype_type_flags(uint8_t type, uint8_t flags) {
  ngtcp2_pkt_hd hd = {0};

  hd.type = type;
  hd.flags = flags;

  return strpkttype(&hd);
}

static const char *strevent(ngtcp2_log_event ev) {
  switch (ev) {
  case NGTCP2_LOG_EVENT_CON:
    return "con";
  case NGTCP2_LOG_EVENT_PKT:
    return "pkt";
  case NGTCP2_LOG_EVENT_FRM:
    return "frm";
  case NGTCP2_LOG_EVENT_RCV:
    return "rcv";
  case NGTCP2_LOG_EVENT_CRY:
    return "cry";
  case NGTCP2_LOG_EVENT_PTV:
    return "ptv";
  case NGTCP2_LOG_EVENT_NONE:
  default:
    return "non";
  }
}

static uint64_t timestamp_cast(uint64_t ns) { return ns / NGTCP2_MILLISECONDS; }

static void log_fr_stream(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                          const ngtcp2_stream *fr, const char *dir) {
  log->log_printf(
      log->user_data,
      (NGTCP2_LOG_PKT " STREAM(0x%02x) id=0x%" PRIx64 " fin=%d offset=%" PRIu64
                      " len=%" PRIu64 " uni=%d"),
      NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type | fr->flags, fr->stream_id,
      fr->fin, fr->offset, ngtcp2_vec_len(fr->data, fr->datacnt),
      (fr->stream_id & 0x2) != 0);
}

static void log_fr_ack(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                       const ngtcp2_ack *fr, const char *dir) {
  int64_t largest_ack, min_ack;
  size_t i;

  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT " ACK(0x%02x) largest_ack=%" PRId64
                                  " ack_delay=%" PRIu64 "(%" PRIu64
                                  ") ack_range_count=%zu"),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->largest_ack,
                  fr->ack_delay_unscaled / NGTCP2_MILLISECONDS, fr->ack_delay,
                  fr->rangecnt);

  largest_ack = fr->largest_ack;
  min_ack = fr->largest_ack - (int64_t)fr->first_ack_range;

  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT " ACK(0x%02x) range=[%" PRId64 "..%" PRId64
                                  "] len=%" PRIu64),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, largest_ack, min_ack,
                  fr->first_ack_range);

  for (i = 0; i < fr->rangecnt; ++i) {
    const ngtcp2_ack_range *range = &fr->ranges[i];
    largest_ack = min_ack - (int64_t)range->gap - 2;
    min_ack = largest_ack - (int64_t)range->len;
    log->log_printf(log->user_data,
                    (NGTCP2_LOG_PKT " ACK(0x%02x) range=[%" PRId64 "..%" PRId64
                                    "] gap=%" PRIu64 " len=%" PRIu64),
                    NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, largest_ack,
                    min_ack, range->gap, range->len);
  }

  if (fr->type == NGTCP2_FRAME_ACK_ECN) {
    log->log_printf(log->user_data,
                    (NGTCP2_LOG_PKT " ACK(0x%02x) ect0=%" PRIu64
                                    " ect1=%" PRIu64 " ce=%" PRIu64),
                    NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->ecn.ect0,
                    fr->ecn.ect1, fr->ecn.ce);
  }
}

static void log_fr_padding(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                           const ngtcp2_padding *fr, const char *dir) {
  log->log_printf(log->user_data, (NGTCP2_LOG_PKT " PADDING(0x%02x) len=%zu"),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->len);
}

static void log_fr_reset_stream(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                const ngtcp2_reset_stream *fr,
                                const char *dir) {
  log->log_printf(
      log->user_data,
      (NGTCP2_LOG_PKT " RESET_STREAM(0x%02x) id=0x%" PRIx64
                      " app_error_code=%s(0x%" PRIx64 ") final_size=%" PRIu64),
      NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->stream_id,
      strapperrorcode(fr->app_error_code), fr->app_error_code, fr->final_size);
}

static void log_fr_connection_close(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                    const ngtcp2_connection_close *fr,
                                    const char *dir) {
  char reason[256];
  size_t reasonlen = ngtcp2_min(sizeof(reason) - 1, fr->reasonlen);

  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT
                   " CONNECTION_CLOSE(0x%02x) error_code=%s(0x%" PRIx64 ") "
                   "frame_type=%" PRIx64 " reason_len=%zu reason=[%s]"),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type,
                  fr->type == NGTCP2_FRAME_CONNECTION_CLOSE
                      ? strerrorcode(fr->error_code)
                      : strapperrorcode(fr->error_code),
                  fr->error_code, fr->frame_type, fr->reasonlen,
                  ngtcp2_encode_printable_ascii(reason, fr->reason, reasonlen));
}

static void log_fr_max_data(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                            const ngtcp2_max_data *fr, const char *dir) {
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT " MAX_DATA(0x%02x) max_data=%" PRIu64),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->max_data);
}

static void log_fr_max_stream_data(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                   const ngtcp2_max_stream_data *fr,
                                   const char *dir) {
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT " MAX_STREAM_DATA(0x%02x) id=0x%" PRIx64
                                  " max_stream_data=%" PRIu64),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->stream_id,
                  fr->max_stream_data);
}

static void log_fr_max_streams(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                               const ngtcp2_max_streams *fr, const char *dir) {
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT " MAX_STREAMS(0x%02x) max_streams=%" PRIu64),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->max_streams);
}

static void log_fr_ping(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                        const ngtcp2_ping *fr, const char *dir) {
  log->log_printf(log->user_data, (NGTCP2_LOG_PKT " PING(0x%02x)"),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type);
}

static void log_fr_data_blocked(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                const ngtcp2_data_blocked *fr,
                                const char *dir) {
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT " DATA_BLOCKED(0x%02x) offset=%" PRIu64),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->offset);
}

static void log_fr_stream_data_blocked(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                       const ngtcp2_stream_data_blocked *fr,
                                       const char *dir) {
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT " STREAM_DATA_BLOCKED(0x%02x) id=0x%" PRIx64
                                  " offset=%" PRIu64),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->stream_id,
                  fr->offset);
}

static void log_fr_streams_blocked(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                   const ngtcp2_streams_blocked *fr,
                                   const char *dir) {
  log->log_printf(
      log->user_data,
      (NGTCP2_LOG_PKT " STREAMS_BLOCKED(0x%02x) max_streams=%" PRIu64),
      NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->max_streams);
}

static void log_fr_new_connection_id(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                     const ngtcp2_new_connection_id *fr,
                                     const char *dir) {
  uint8_t buf[sizeof(fr->stateless_reset_token) * 2 + 1];
  uint8_t cid[sizeof(fr->cid.data) * 2 + 1];

  log->log_printf(
      log->user_data,
      (NGTCP2_LOG_PKT " NEW_CONNECTION_ID(0x%02x) seq=%" PRIu64
                      " cid=0x%s retire_prior_to=%" PRIu64
                      " stateless_reset_token=0x%s"),
      NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->seq,
      (const char *)ngtcp2_encode_hex(cid, fr->cid.data, fr->cid.datalen),
      fr->retire_prior_to,
      (const char *)ngtcp2_encode_hex(buf, fr->stateless_reset_token,
                                      sizeof(fr->stateless_reset_token)));
}

static void log_fr_stop_sending(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                const ngtcp2_stop_sending *fr,
                                const char *dir) {
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT " STOP_SENDING(0x%02x) id=0x%" PRIx64
                                  " app_error_code=%s(0x%" PRIx64 ")"),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->stream_id,
                  strapperrorcode(fr->app_error_code), fr->app_error_code);
}

static void log_fr_path_challenge(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                  const ngtcp2_path_challenge *fr,
                                  const char *dir) {
  uint8_t buf[sizeof(fr->data) * 2 + 1];

  log->log_printf(
      log->user_data, (NGTCP2_LOG_PKT " PATH_CHALLENGE(0x%02x) data=0x%s"),
      NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type,
      (const char *)ngtcp2_encode_hex(buf, fr->data, sizeof(fr->data)));
}

static void log_fr_path_response(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                 const ngtcp2_path_response *fr,
                                 const char *dir) {
  uint8_t buf[sizeof(fr->data) * 2 + 1];

  log->log_printf(
      log->user_data, (NGTCP2_LOG_PKT " PATH_RESPONSE(0x%02x) data=0x%s"),
      NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type,
      (const char *)ngtcp2_encode_hex(buf, fr->data, sizeof(fr->data)));
}

static void log_fr_crypto(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                          const ngtcp2_crypto *fr, const char *dir) {
  log->log_printf(
      log->user_data,
      (NGTCP2_LOG_PKT " CRYPTO(0x%02x) offset=%" PRIu64 " len=%" PRIu64),
      NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->offset,
      ngtcp2_vec_len(fr->data, fr->datacnt));
}

static void log_fr_new_token(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                             const ngtcp2_new_token *fr, const char *dir) {
  /* Show at most first 64 bytes of token.  If token is longer than 64
     bytes, log first 64 bytes and then append "*" */
  uint8_t buf[128 + 1 + 1];
  uint8_t *p;

  if (fr->token.len > 64) {
    p = ngtcp2_encode_hex(buf, fr->token.base, 64);
    p[128] = '*';
    p[129] = '\0';
  } else {
    p = ngtcp2_encode_hex(buf, fr->token.base, fr->token.len);
  }
  log->log_printf(
      log->user_data, (NGTCP2_LOG_PKT " NEW_TOKEN(0x%02x) token=0x%s len=%zu"),
      NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, (const char *)p, fr->token.len);
}

static void log_fr_retire_connection_id(ngtcp2_log *log,
                                        const ngtcp2_pkt_hd *hd,
                                        const ngtcp2_retire_connection_id *fr,
                                        const char *dir) {
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT " RETIRE_CONNECTION_ID(0x%02x) seq=%" PRIu64),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type, fr->seq);
}

static void log_fr_handshake_done(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                                  const ngtcp2_handshake_done *fr,
                                  const char *dir) {
  log->log_printf(log->user_data, (NGTCP2_LOG_PKT " HANDSHAKE_DONE(0x%02x)"),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type);
}

static void log_fr_datagram(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                            const ngtcp2_datagram *fr, const char *dir) {
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_PKT " DATAGRAM(0x%02x) len=%" PRIu64),
                  NGTCP2_LOG_FRM_HD_FIELDS(dir), fr->type,
                  ngtcp2_vec_len(fr->data, fr->datacnt));
}

static void log_fr(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                   const ngtcp2_frame *fr, const char *dir) {
  switch (fr->type) {
  case NGTCP2_FRAME_STREAM:
    log_fr_stream(log, hd, &fr->stream, dir);
    break;
  case NGTCP2_FRAME_ACK:
  case NGTCP2_FRAME_ACK_ECN:
    log_fr_ack(log, hd, &fr->ack, dir);
    break;
  case NGTCP2_FRAME_PADDING:
    log_fr_padding(log, hd, &fr->padding, dir);
    break;
  case NGTCP2_FRAME_RESET_STREAM:
    log_fr_reset_stream(log, hd, &fr->reset_stream, dir);
    break;
  case NGTCP2_FRAME_CONNECTION_CLOSE:
  case NGTCP2_FRAME_CONNECTION_CLOSE_APP:
    log_fr_connection_close(log, hd, &fr->connection_close, dir);
    break;
  case NGTCP2_FRAME_MAX_DATA:
    log_fr_max_data(log, hd, &fr->max_data, dir);
    break;
  case NGTCP2_FRAME_MAX_STREAM_DATA:
    log_fr_max_stream_data(log, hd, &fr->max_stream_data, dir);
    break;
  case NGTCP2_FRAME_MAX_STREAMS_BIDI:
  case NGTCP2_FRAME_MAX_STREAMS_UNI:
    log_fr_max_streams(log, hd, &fr->max_streams, dir);
    break;
  case NGTCP2_FRAME_PING:
    log_fr_ping(log, hd, &fr->ping, dir);
    break;
  case NGTCP2_FRAME_DATA_BLOCKED:
    log_fr_data_blocked(log, hd, &fr->data_blocked, dir);
    break;
  case NGTCP2_FRAME_STREAM_DATA_BLOCKED:
    log_fr_stream_data_blocked(log, hd, &fr->stream_data_blocked, dir);
    break;
  case NGTCP2_FRAME_STREAMS_BLOCKED_BIDI:
  case NGTCP2_FRAME_STREAMS_BLOCKED_UNI:
    log_fr_streams_blocked(log, hd, &fr->streams_blocked, dir);
    break;
  case NGTCP2_FRAME_NEW_CONNECTION_ID:
    log_fr_new_connection_id(log, hd, &fr->new_connection_id, dir);
    break;
  case NGTCP2_FRAME_STOP_SENDING:
    log_fr_stop_sending(log, hd, &fr->stop_sending, dir);
    break;
  case NGTCP2_FRAME_PATH_CHALLENGE:
    log_fr_path_challenge(log, hd, &fr->path_challenge, dir);
    break;
  case NGTCP2_FRAME_PATH_RESPONSE:
    log_fr_path_response(log, hd, &fr->path_response, dir);
    break;
  case NGTCP2_FRAME_CRYPTO:
    log_fr_crypto(log, hd, &fr->crypto, dir);
    break;
  case NGTCP2_FRAME_NEW_TOKEN:
    log_fr_new_token(log, hd, &fr->new_token, dir);
    break;
  case NGTCP2_FRAME_RETIRE_CONNECTION_ID:
    log_fr_retire_connection_id(log, hd, &fr->retire_connection_id, dir);
    break;
  case NGTCP2_FRAME_HANDSHAKE_DONE:
    log_fr_handshake_done(log, hd, &fr->handshake_done, dir);
    break;
  case NGTCP2_FRAME_DATAGRAM:
  case NGTCP2_FRAME_DATAGRAM_LEN:
    log_fr_datagram(log, hd, &fr->datagram, dir);
    break;
  default:
    ngtcp2_unreachable();
  }
}

void ngtcp2_log_rx_fr(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                      const ngtcp2_frame *fr) {
  if (!log->log_printf) {
    return;
  }

  log_fr(log, hd, fr, "rx");
}

void ngtcp2_log_tx_fr(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                      const ngtcp2_frame *fr) {
  if (!log->log_printf) {
    return;
  }

  log_fr(log, hd, fr, "tx");
}

void ngtcp2_log_rx_vn(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                      const uint32_t *sv, size_t nsv) {
  size_t i;

  if (!log->log_printf) {
    return;
  }

  for (i = 0; i < nsv; ++i) {
    log->log_printf(log->user_data, (NGTCP2_LOG_PKT " v=0x%08x"),
                    NGTCP2_LOG_PKT_HD_FIELDS("rx"), sv[i]);
  }
}

void ngtcp2_log_rx_sr(ngtcp2_log *log, const ngtcp2_pkt_stateless_reset *sr) {
  uint8_t buf[sizeof(sr->stateless_reset_token) * 2 + 1];
  ngtcp2_pkt_hd shd;
  ngtcp2_pkt_hd *hd = &shd;

  if (!log->log_printf) {
    return;
  }

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

  shd.type = NGTCP2_PKT_STATELESS_RESET;

  log->log_printf(
      log->user_data, (NGTCP2_LOG_PKT " token=0x%s randlen=%zu"),
      NGTCP2_LOG_PKT_HD_FIELDS("rx"),
      (const char *)ngtcp2_encode_hex(buf, sr->stateless_reset_token,
                                      sizeof(sr->stateless_reset_token)),
      sr->randlen);
}

void ngtcp2_log_remote_tp(ngtcp2_log *log, uint8_t exttype,
                          const ngtcp2_transport_params *params) {
  uint8_t token[NGTCP2_STATELESS_RESET_TOKENLEN * 2 + 1];
  uint8_t addr[16 * 2 + 7 + 1];
  uint8_t cid[NGTCP2_MAX_CIDLEN * 2 + 1];
  size_t i;
  const ngtcp2_sockaddr_in *sa_in;
  const ngtcp2_sockaddr_in6 *sa_in6;
  const uint8_t *p;
  uint32_t version;

  if (!log->log_printf) {
    return;
  }

  if (exttype == NGTCP2_TRANSPORT_PARAMS_TYPE_ENCRYPTED_EXTENSIONS) {
    if (params->stateless_reset_token_present) {
      log->log_printf(log->user_data,
                      (NGTCP2_LOG_TP " stateless_reset_token=0x%s"),
                      NGTCP2_LOG_TP_HD_FIELDS,
                      (const char *)ngtcp2_encode_hex(
                          token, params->stateless_reset_token,
                          sizeof(params->stateless_reset_token)));
    }

    if (params->preferred_address_present) {
      if (params->preferred_address.ipv4_present) {
        sa_in = &params->preferred_address.ipv4;

        log->log_printf(log->user_data,
                        (NGTCP2_LOG_TP " preferred_address.ipv4_addr=%s"),
                        NGTCP2_LOG_TP_HD_FIELDS,
                        (const char *)ngtcp2_encode_ipv4(
                            addr, (const uint8_t *)&sa_in->sin_addr));
        log->log_printf(log->user_data,
                        (NGTCP2_LOG_TP " preferred_address.ipv4_port=%u"),
                        NGTCP2_LOG_TP_HD_FIELDS, ngtcp2_ntohs(sa_in->sin_port));
      }

      if (params->preferred_address.ipv6_present) {
        sa_in6 = &params->preferred_address.ipv6;

        log->log_printf(log->user_data,
                        (NGTCP2_LOG_TP " preferred_address.ipv6_addr=%s"),
                        NGTCP2_LOG_TP_HD_FIELDS,
                        (const char *)ngtcp2_encode_ipv6(
                            addr, (const uint8_t *)&sa_in6->sin6_addr));
        log->log_printf(
            log->user_data, (NGTCP2_LOG_TP " preferred_address.ipv6_port=%u"),
            NGTCP2_LOG_TP_HD_FIELDS, ngtcp2_ntohs(sa_in6->sin6_port));
      }

      log->log_printf(log->user_data,
                      (NGTCP2_LOG_TP " preferred_address.cid=0x%s"),
                      NGTCP2_LOG_TP_HD_FIELDS,
                      (const char *)ngtcp2_encode_hex(
                          cid, params->preferred_address.cid.data,
                          params->preferred_address.cid.datalen));
      log->log_printf(
          log->user_data,
          (NGTCP2_LOG_TP " preferred_address.stateless_reset_token=0x%s"),
          NGTCP2_LOG_TP_HD_FIELDS,
          (const char *)ngtcp2_encode_hex(
              token, params->preferred_address.stateless_reset_token,
              sizeof(params->preferred_address.stateless_reset_token)));
    }

    log->log_printf(
        log->user_data,
        (NGTCP2_LOG_TP " original_destination_connection_id=0x%s"),
        NGTCP2_LOG_TP_HD_FIELDS,
        (const char *)ngtcp2_encode_hex(cid, params->original_dcid.data,
                                        params->original_dcid.datalen));

    if (params->retry_scid_present) {
      log->log_printf(
          log->user_data, (NGTCP2_LOG_TP " retry_source_connection_id=0x%s"),
          NGTCP2_LOG_TP_HD_FIELDS,
          (const char *)ngtcp2_encode_hex(cid, params->retry_scid.data,
                                          params->retry_scid.datalen));
    }
  }

  log->log_printf(
      log->user_data, (NGTCP2_LOG_TP " initial_source_connection_id=0x%s"),
      NGTCP2_LOG_TP_HD_FIELDS,
      (const char *)ngtcp2_encode_hex(cid, params->initial_scid.data,
                                      params->initial_scid.datalen));

  log->log_printf(
      log->user_data,
      (NGTCP2_LOG_TP " initial_max_stream_data_bidi_local=%" PRIu64),
      NGTCP2_LOG_TP_HD_FIELDS, params->initial_max_stream_data_bidi_local);
  log->log_printf(
      log->user_data,
      (NGTCP2_LOG_TP " initial_max_stream_data_bidi_remote=%" PRIu64),
      NGTCP2_LOG_TP_HD_FIELDS, params->initial_max_stream_data_bidi_remote);
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_TP " initial_max_stream_data_uni=%" PRIu64),
                  NGTCP2_LOG_TP_HD_FIELDS, params->initial_max_stream_data_uni);
  log->log_printf(log->user_data, (NGTCP2_LOG_TP " initial_max_data=%" PRIu64),
                  NGTCP2_LOG_TP_HD_FIELDS, params->initial_max_data);
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_TP " initial_max_streams_bidi=%" PRIu64),
                  NGTCP2_LOG_TP_HD_FIELDS, params->initial_max_streams_bidi);
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_TP " initial_max_streams_uni=%" PRIu64),
                  NGTCP2_LOG_TP_HD_FIELDS, params->initial_max_streams_uni);
  log->log_printf(log->user_data, (NGTCP2_LOG_TP " max_idle_timeout=%" PRIu64),
                  NGTCP2_LOG_TP_HD_FIELDS,
                  params->max_idle_timeout / NGTCP2_MILLISECONDS);
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_TP " max_udp_payload_size=%" PRIu64),
                  NGTCP2_LOG_TP_HD_FIELDS, params->max_udp_payload_size);
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_TP " ack_delay_exponent=%" PRIu64),
                  NGTCP2_LOG_TP_HD_FIELDS, params->ack_delay_exponent);
  log->log_printf(log->user_data, (NGTCP2_LOG_TP " max_ack_delay=%" PRIu64),
                  NGTCP2_LOG_TP_HD_FIELDS,
                  params->max_ack_delay / NGTCP2_MILLISECONDS);
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_TP " active_connection_id_limit=%" PRIu64),
                  NGTCP2_LOG_TP_HD_FIELDS, params->active_connection_id_limit);
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_TP " disable_active_migration=%d"),
                  NGTCP2_LOG_TP_HD_FIELDS, params->disable_active_migration);
  log->log_printf(log->user_data,
                  (NGTCP2_LOG_TP " max_datagram_frame_size=%" PRIu64),
                  NGTCP2_LOG_TP_HD_FIELDS, params->max_datagram_frame_size);
  log->log_printf(log->user_data, (NGTCP2_LOG_TP " grease_quic_bit=%d"),
                  NGTCP2_LOG_TP_HD_FIELDS, params->grease_quic_bit);

  if (params->version_info_present) {
    log->log_printf(
        log->user_data,
        (NGTCP2_LOG_TP " version_information.chosen_version=0x%08x"),
        NGTCP2_LOG_TP_HD_FIELDS, params->version_info.chosen_version);

    assert(!(params->version_info.other_versionslen & 0x3));

    for (i = 0, p = params->version_info.other_versions;
         i < params->version_info.other_versionslen; i += sizeof(uint32_t)) {
      p = ngtcp2_get_uint32(&version, p);

      log->log_printf(
          log->user_data,
          (NGTCP2_LOG_TP " version_information.other_versions[%zu]=0x%08x"),
          NGTCP2_LOG_TP_HD_FIELDS, i >> 2, version);
    }
  }
}

void ngtcp2_log_pkt_lost(ngtcp2_log *log, int64_t pkt_num, uint8_t type,
                         uint8_t flags, ngtcp2_tstamp sent_ts) {
  if (!log->log_printf) {
    return;
  }

  ngtcp2_log_info(log, NGTCP2_LOG_EVENT_RCV,
                  "pkn=%" PRId64 " lost type=%s sent_ts=%" PRIu64, pkt_num,
                  strpkttype_type_flags(type, flags), sent_ts);
}

static void log_pkt_hd(ngtcp2_log *log, const ngtcp2_pkt_hd *hd,
                       const char *dir) {
  uint8_t dcid[sizeof(hd->dcid.data) * 2 + 1];
  uint8_t scid[sizeof(hd->scid.data) * 2 + 1];

  if (!log->log_printf) {
    return;
  }

  if (hd->type == NGTCP2_PKT_1RTT) {
    ngtcp2_log_info(
        log, NGTCP2_LOG_EVENT_PKT, "%s pkn=%" PRId64 " dcid=0x%s type=%s k=%d",
        dir, hd->pkt_num,
        (const char *)ngtcp2_encode_hex(dcid, hd->dcid.data, hd->dcid.datalen),
        strpkttype(hd), (hd->flags & NGTCP2_PKT_FLAG_KEY_PHASE) != 0);
  } else {
    ngtcp2_log_info(
        log, NGTCP2_LOG_EVENT_PKT,
        "%s pkn=%" PRId64 " dcid=0x%s scid=0x%s version=0x%08x type=%s len=%zu",
        dir, hd->pkt_num,
        (const char *)ngtcp2_encode_hex(dcid, hd->dcid.data, hd->dcid.datalen),
        (const char *)ngtcp2_encode_hex(scid, hd->scid.data, hd->scid.datalen),
        hd->version, strpkttype(hd), hd->len);
  }
}

void ngtcp2_log_rx_pkt_hd(ngtcp2_log *log, const ngtcp2_pkt_hd *hd) {
  log_pkt_hd(log, hd, "rx");
}

void ngtcp2_log_tx_pkt_hd(ngtcp2_log *log, const ngtcp2_pkt_hd *hd) {
  log_pkt_hd(log, hd, "tx");
}

void ngtcp2_log_info(ngtcp2_log *log, ngtcp2_log_event ev, const char *fmt,
                     ...) {
  va_list ap;
  int n;
  char buf[NGTCP2_LOG_BUFLEN];

  if (!log->log_printf) {
    return;
  }

  va_start(ap, fmt);
  n = vsnprintf(buf, sizeof(buf), fmt, ap);
  va_end(ap);

  if (n < 0 || (size_t)n >= sizeof(buf)) {
    return;
  }

  log->log_printf(log->user_data, (NGTCP2_LOG_HD " %s"),
                  timestamp_cast(log->last_ts - log->ts), log->scid,
                  strevent(ev), buf);
}

void ngtcp2_log_tx_cancel(ngtcp2_log *log, const ngtcp2_pkt_hd *hd) {
  ngtcp2_log_info(log, NGTCP2_LOG_EVENT_PKT,
                  "cancel tx pkn=%" PRId64 " type=%s", hd->pkt_num,
                  strpkttype(hd));
}