summaryrefslogtreecommitdiffstats
path: root/ui/qt/follow_stream_dialog.cpp
blob: dbae16044c7febe9f36c58f4e11c13c7532e602c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
/* follow_stream_dialog.cpp
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "follow_stream_dialog.h"
#include <ui_follow_stream_dialog.h>

#include "main_application.h"
#include "main_window.h"

#include "frame_tvbuff.h"
#include "epan/follow.h"
#include "epan/prefs.h"
#include "epan/addr_resolv.h"
#include "epan/charsets.h"
#include "epan/epan_dissect.h"
#include "epan/tap.h"

#include "ui/alert_box.h"
#include "ui/simple_dialog.h"
#include <ui/recent.h>
#include <wsutil/utf8_entities.h>
#include <wsutil/ws_assert.h>

#include "wsutil/file_util.h"
#include "wsutil/str_util.h"

#include "ws_symbol_export.h"

#include <ui/qt/utils/color_utils.h>
#include <ui/qt/utils/qt_ui_utils.h>

#include "progress_frame.h"

#include "ui/qt/widgets/wireshark_file_dialog.h"

#include <QElapsedTimer>
#include <QKeyEvent>
#include <QMessageBox>
#include <QMutex>
#include <QPrintDialog>
#include <QPrinter>
#include <QScrollBar>
#include <QTextCodec>

// To do:
// - Show text while tapping.
// - Instead of calling QMessageBox, display the error message in the text
//   box and disable the appropriate controls.
// - Add a progress bar and connect captureCaptureUpdateContinue to it
// - User's Guide documents the "Raw" type as "same as ASCII, but saving binary
//   data". However it currently displays hex-encoded data.

// Matches SplashOverlay.
static int info_update_freq_ = 100;

// Handle the loop breaking notification properly
static QMutex loop_break_mutex;

// Indicates that a Follow Stream is currently running
static gboolean isReadRunning;

Q_DECLARE_METATYPE(bytes_show_type)

FollowStreamDialog::FollowStreamDialog(QWidget &parent, CaptureFile &cf, int proto_id) :
    WiresharkDialog(parent, cf),
    ui(new Ui::FollowStreamDialog),
    b_find_(NULL),
    follower_(NULL),
    truncated_(false),
    client_buffer_count_(0),
    server_buffer_count_(0),
    client_packet_count_(0),
    server_packet_count_(0),
    last_packet_(0),
    last_from_server_(0),
    turns_(0),
    use_regex_find_(false),
    terminating_(false),
    previous_sub_stream_num_(0)
{
    ui->setupUi(this);
    loadGeometry(parent.width() * 2 / 3, parent.height());

    ui->streamNumberSpinBox->setStyleSheet("QSpinBox { min-width: 2em; }");
    ui->subStreamNumberSpinBox->setStyleSheet("QSpinBox { min-width: 2em; }");
    ui->streamNumberSpinBox->setKeyboardTracking(false);
    ui->subStreamNumberSpinBox->setKeyboardTracking(false);

    follower_ = get_follow_by_proto_id(proto_id);
    if (follower_ == NULL) {
        ws_assert_not_reached();
    }

    memset(&follow_info_, 0, sizeof(follow_info_));
    follow_info_.show_stream = BOTH_HOSTS;
    follow_info_.substream_id = SUBSTREAM_UNUSED;

    ui->teStreamContent->installEventFilter(this);

    connect(ui->leFind, SIGNAL(useRegexFind(bool)), this, SLOT(useRegexFind(bool)));

    QComboBox *cbcs = ui->cbCharset;
    cbcs->blockSignals(true);
    cbcs->addItem(tr("ASCII"), SHOW_ASCII);
    cbcs->addItem(tr("C Arrays"), SHOW_CARRAY);
    cbcs->addItem(tr("EBCDIC"), SHOW_EBCDIC);
    cbcs->addItem(tr("Hex Dump"), SHOW_HEXDUMP);
    cbcs->addItem(tr("Raw"), SHOW_RAW);
    // UTF-8 is guaranteed to exist as a QTextCodec
    cbcs->addItem(tr("UTF-8"), SHOW_CODEC);
    cbcs->addItem(tr("YAML"), SHOW_YAML);
    cbcs->setCurrentIndex(cbcs->findData(recent.gui_follow_show));
    cbcs->blockSignals(false);

    b_filter_out_ = ui->buttonBox->addButton(tr("Filter Out This Stream"), QDialogButtonBox::ActionRole);
    connect(b_filter_out_, SIGNAL(clicked()), this, SLOT(filterOut()));

    b_print_ = ui->buttonBox->addButton(tr("Print"), QDialogButtonBox::ActionRole);
    connect(b_print_, SIGNAL(clicked()), this, SLOT(printStream()));

    b_save_ = ui->buttonBox->addButton(tr("Save as…"), QDialogButtonBox::ActionRole);
    connect(b_save_, SIGNAL(clicked()), this, SLOT(saveAs()));

    b_back_ = ui->buttonBox->addButton(tr("Back"), QDialogButtonBox::ActionRole);
    connect(b_back_, SIGNAL(clicked()), this, SLOT(backButton()));

    ProgressFrame::addToButtonBox(ui->buttonBox, &parent);

    connect(ui->buttonBox, SIGNAL(helpRequested()), this, SLOT(helpButton()));
    connect(ui->teStreamContent, SIGNAL(mouseMovedToTextCursorPosition(int)),
            this, SLOT(fillHintLabel(int)));
    connect(ui->teStreamContent, SIGNAL(mouseClickedOnTextCursorPosition(int)),
            this, SLOT(goToPacketForTextPos(int)));

    fillHintLabel(-1);
}

FollowStreamDialog::~FollowStreamDialog()
{
    delete ui;
    resetStream(); // Frees payload
}

void FollowStreamDialog::addCodecs(const QMap<QString, QTextCodec *> &codecMap)
{
    // Make the combobox respect max visible items?
    //ui->cbCharset->setStyleSheet("QComboBox { combobox-popup: 0;}");
    ui->cbCharset->insertSeparator(ui->cbCharset->count());
    for (const auto &codec : codecMap) {
        // This is already in the menu and handled separately
        if (codec->name() != "US-ASCII" && codec->name() != "UTF-8")
            ui->cbCharset->addItem(tr(codec->name()), SHOW_CODEC);
    }
}

void FollowStreamDialog::printStream()
{
#ifndef QT_NO_PRINTER
    QPrinter printer(QPrinter::HighResolution);
    QPrintDialog dialog(&printer, this);
    if (dialog.exec() == QDialog::Accepted)
        ui->teStreamContent->print(&printer);
#endif
}

void FollowStreamDialog::fillHintLabel(int text_pos)
{
    QString hint;
    int pkt = -1;

    if (text_pos >= 0) {
        QMap<int, guint32>::iterator it = text_pos_to_packet_.upperBound(text_pos);
        if (it != text_pos_to_packet_.end()) {
            pkt = it.value();
        }
    }

    if (pkt > 0) {
        hint = QString(tr("Packet %1. ")).arg(pkt);
    }

    hint += tr("%Ln <span style=\"color: %1; background-color:%2\">client</span> pkt(s), ", "", client_packet_count_)
            .arg(ColorUtils::fromColorT(prefs.st_client_fg).name())
            .arg(ColorUtils::fromColorT(prefs.st_client_bg).name())
            + tr("%Ln <span style=\"color: %1; background-color:%2\">server</span> pkt(s), ", "", server_packet_count_)
            .arg(ColorUtils::fromColorT(prefs.st_server_fg).name())
            .arg(ColorUtils::fromColorT(prefs.st_server_bg).name())
            + tr("%Ln turn(s).", "", turns_);

    if (pkt > 0) {
        hint.append(QString(tr(" Click to select.")));
    }

    hint.prepend("<small><i>");
    hint.append("</i></small>");
    ui->hintLabel->setText(hint);
}

void FollowStreamDialog::goToPacketForTextPos(int text_pos)
{
    int pkt = -1;
    if (file_closed_) {
        return;
    }

    if (text_pos >= 0) {
        QMap<int, guint32>::iterator it = text_pos_to_packet_.upperBound(text_pos);
        if (it != text_pos_to_packet_.end()) {
            pkt = it.value();
        }
    }

    if (pkt > 0) {
        emit goToPacket(pkt);
    }
}

void FollowStreamDialog::updateWidgets(bool follow_in_progress)
{
    // XXX: If follow_in_progress set cursor to Qt::BusyCursor or WaitCursor,
    // otherwise unset cursor?
    bool enable = !follow_in_progress;
    if (file_closed_) {
        ui->teStreamContent->setEnabled(true);
        enable = false;
    }

    ui->cbDirections->setEnabled(enable);
    ui->cbCharset->setEnabled(enable);
    ui->streamNumberSpinBox->setReadOnly(!enable);
    if (get_follow_sub_stream_id_func(follower_) != NULL) {
        ui->subStreamNumberSpinBox->setReadOnly(!enable);
    }
    ui->leFind->setEnabled(enable);
    ui->bFind->setEnabled(enable);
    b_filter_out_->setEnabled(enable);
    b_print_->setEnabled(enable);
    b_save_->setEnabled(enable);

    WiresharkDialog::updateWidgets();
}

void FollowStreamDialog::useRegexFind(bool use_regex)
{
    use_regex_find_ = use_regex;
    if (use_regex_find_)
        ui->lFind->setText(tr("Regex Find:"));
    else
        ui->lFind->setText(tr("Find:"));
}

void FollowStreamDialog::findText(bool go_back)
{
    if (ui->leFind->text().isEmpty()) return;

    bool found;
    if (use_regex_find_) {
#if (QT_VERSION >= QT_VERSION_CHECK(5, 13, 0))
        QRegularExpression regex(ui->leFind->text(), QRegularExpression::UseUnicodePropertiesOption);
#else
        QRegExp regex(ui->leFind->text());
#endif
        found = ui->teStreamContent->find(regex);
    } else {
        found = ui->teStreamContent->find(ui->leFind->text());
    }

    if (found) {
        ui->teStreamContent->setFocus();
    } else if (go_back) {
        ui->teStreamContent->moveCursor(QTextCursor::Start);
        findText(false);
    }
}

void FollowStreamDialog::saveAs()
{
    QString file_name = WiresharkFileDialog::getSaveFileName(this, mainApp->windowTitleString(tr("Save Stream Content As…")));
    if (file_name.isEmpty()) {
        return;
    }

    QFile file(file_name);
    if (!file.open(QIODevice::WriteOnly)) {
        open_failure_alert_box(file_name.toUtf8().constData(), errno, TRUE);
        return;
    }

    // Unconditionally save data as UTF-8 (even if data is decoded otherwise).
    QByteArray bytes = ui->teStreamContent->toPlainText().toUtf8();
    if (recent.gui_follow_show == SHOW_RAW) {
        // The "Raw" format is currently displayed as hex data and needs to be
        // converted to binary data.
        bytes = QByteArray::fromHex(bytes);
    }

    QDataStream out(&file);
    out.writeRawData(bytes.constData(), static_cast<int>(bytes.size()));
}

void FollowStreamDialog::helpButton()
{
    mainApp->helpTopicAction(HELP_FOLLOW_STREAM_DIALOG);
}

void FollowStreamDialog::backButton()
{
    if (terminating_)
        return;

    output_filter_ = previous_filter_;

    close();
}

void FollowStreamDialog::filterOut()
{
    if (terminating_)
        return;

    output_filter_ = filter_out_filter_;

    close();
}

void FollowStreamDialog::close()
{
    terminating_ = true;

    // Update filter - Use:
    //     previous_filter if 'Close' (passed in follow() method)
    //     filter_out_filter_ if 'Filter Out This Stream' (built by appending !current_stream to previous_filter)
    //     leave filter alone if window closed. (current stream)
    emit updateFilter(output_filter_, TRUE);

    WiresharkDialog::close();
}

void FollowStreamDialog::on_cbDirections_currentIndexChanged(int idx)
{
    switch(idx)
    {
    case 0 :
        follow_info_.show_stream = BOTH_HOSTS;
        break;
    case 1 :
        follow_info_.show_stream = FROM_SERVER;
        break;
    case 2 :
        follow_info_.show_stream = FROM_CLIENT;
        break;
    default:
        return;
    }

    readStream();
}

void FollowStreamDialog::on_cbCharset_currentIndexChanged(int idx)
{
    if (idx < 0) return;
    recent.gui_follow_show = ui->cbCharset->currentData().value<bytes_show_type>();
    readStream();
}

void FollowStreamDialog::on_bFind_clicked()
{
    findText();
}

void FollowStreamDialog::on_leFind_returnPressed()
{
    findText();
}

void FollowStreamDialog::on_streamNumberSpinBox_valueChanged(int stream_num)
{
    if (file_closed_) return;

    int sub_stream_num = 0;
    ui->subStreamNumberSpinBox->blockSignals(true);
    sub_stream_num = ui->subStreamNumberSpinBox->value();
    ui->subStreamNumberSpinBox->blockSignals(false);

    gboolean ok;
    if (ui->subStreamNumberSpinBox->isVisible()) {
        /* We need to find a suitable sub stream for the new stream */
        follow_sub_stream_id_func sub_stream_func;
        sub_stream_func = get_follow_sub_stream_id_func(follower_);

        if (sub_stream_func == NULL) {
            // Should not happen, this field is only visible for suitable protocols.
            return;
        }

        guint sub_stream_num_new = static_cast<guint>(sub_stream_num);
        if (sub_stream_num < 0) {
            // Stream ID 0 should always exist as it is used for control messages.
            // XXX: That is only guaranteed for HTTP2. For example, in QUIC,
            // stream ID 0 is a normal stream used by the first standard client-
            // initiated bidirectional stream (if it exists, and it might not)
            // and we might have a stream (connection) but only the CRYPTO
            // stream, which does not have a (sub) stream ID.
            // What should we do if there is a stream with no substream to
            // follow? Right now the substream spinbox is left active and
            // the user can change the value to no effect.
            sub_stream_num_new = 0;
            ok = TRUE;
        } else {
            ok = sub_stream_func(static_cast<guint>(stream_num), sub_stream_num_new, FALSE, &sub_stream_num_new);
            if (!ok) {
                ok = sub_stream_func(static_cast<guint>(stream_num), sub_stream_num_new, TRUE, &sub_stream_num_new);
            }
        }
        sub_stream_num = static_cast<gint>(sub_stream_num_new);
    } else {
        /* XXX: For HTTP and TLS, we use the TCP stream index, and really should
         * return false if the TCP stream doesn't have HTTP or TLS. (Or we could
         * switch to having separate HTTP and TLS stream numbers.)
         */
        ok = true;
    }

    if (stream_num >= 0 && ok) {
        follow(previous_filter_, true, stream_num, sub_stream_num);
        previous_sub_stream_num_ = sub_stream_num;
    }
}


void FollowStreamDialog::on_subStreamNumberSpinBox_valueChanged(int sub_stream_num)
{
    if (file_closed_) return;

    int stream_num = 0;
    ui->streamNumberSpinBox->blockSignals(true);
    stream_num = ui->streamNumberSpinBox->value();
    ui->streamNumberSpinBox->blockSignals(false);

    follow_sub_stream_id_func sub_stream_func;
    sub_stream_func = get_follow_sub_stream_id_func(follower_);

    if (sub_stream_func == NULL) {
        // Should not happen, this field is only visible for suitable protocols.
        return;
    }

    guint sub_stream_num_new = static_cast<guint>(sub_stream_num);
    gboolean ok;
    /* previous_sub_stream_num_ is a hack to track which buttons was pressed without event handling */
    if (sub_stream_num < 0) {
        // Stream ID 0 should always exist as it is used for control messages.
        // XXX: That is only guaranteed for HTTP2, see above.
        sub_stream_num_new = 0;
        ok = TRUE;
    } else if (previous_sub_stream_num_ < sub_stream_num) {
        ok = sub_stream_func(static_cast<guint>(stream_num), sub_stream_num_new, FALSE, &sub_stream_num_new);
    } else {
        ok = sub_stream_func(static_cast<guint>(stream_num), sub_stream_num_new, TRUE, &sub_stream_num_new);
    }
    sub_stream_num = static_cast<gint>(sub_stream_num_new);

    if (ok) {
        follow(previous_filter_, true, stream_num, sub_stream_num);
        previous_sub_stream_num_ = sub_stream_num;
    }
}

void FollowStreamDialog::on_buttonBox_rejected()
{
    // Ignore the close button if FollowStreamDialog::close() is running.
    if (terminating_)
        return;

    WiresharkDialog::reject();
}

void FollowStreamDialog::removeStreamControls()
{
    ui->horizontalLayout->removeItem(ui->streamNumberSpacer);
    ui->streamNumberLabel->setVisible(false);
    ui->streamNumberSpinBox->setVisible(false);
    ui->subStreamNumberLabel->setVisible(false);
    ui->subStreamNumberSpinBox->setVisible(false);
}

void FollowStreamDialog::resetStream()
{
    GList *cur;
    follow_record_t *follow_record;

    filter_out_filter_.clear();
    text_pos_to_packet_.clear();
    if (!data_out_filename_.isEmpty()) {
        ws_unlink(data_out_filename_.toUtf8().constData());
    }
    for (cur = follow_info_.payload; cur; cur = gxx_list_next(cur)) {
        follow_record = gxx_list_data(follow_record_t *, cur);
        if (follow_record->data) {
            g_byte_array_free(follow_record->data, TRUE);
        }
        g_free(follow_record);
    }
    g_list_free(follow_info_.payload);

    //Only TCP stream uses fragments
    for (cur = follow_info_.fragments[0]; cur; cur = gxx_list_next(cur)) {
        follow_record = gxx_list_data(follow_record_t *, cur);
        if (follow_record->data) {
            g_byte_array_free(follow_record->data, TRUE);
        }
        g_free(follow_record);
    }
    follow_info_.fragments[0] = Q_NULLPTR;
    for (cur = follow_info_.fragments[1]; cur; cur = gxx_list_next(cur)) {
        follow_record = gxx_list_data(follow_record_t *, cur);
        if (follow_record->data) {
            g_byte_array_free(follow_record->data, TRUE);
        }
        g_free(follow_record);
    }
    follow_info_.fragments[1] = Q_NULLPTR;

    free_address(&follow_info_.client_ip);
    free_address(&follow_info_.server_ip);
    follow_info_.payload = Q_NULLPTR;
    follow_info_.client_port = 0;
}

frs_return_t
FollowStreamDialog::readStream()
{

    // interrupt any reading already running
    loop_break_mutex.lock();
    isReadRunning = FALSE;
    loop_break_mutex.unlock();

    ui->teStreamContent->clear();
    text_pos_to_packet_.clear();
    switch (recent.gui_follow_show) {

    case SHOW_CARRAY:
    case SHOW_HEXDUMP:
    case SHOW_YAML:
        /* We control the width and insert line breaks in these formats. */
        ui->teStreamContent->setWordWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
        break;

    default:
        /* Everything else might have extremely long lines without whitespace,
         * (SHOW_RAW almost surely so), and QTextEdit is O(N^2) trying
         * to search for word boundaries on long lines when adding text.
         */
        ui->teStreamContent->setWordWrapMode(QTextOption::WrapAnywhere);
    }

    truncated_ = false;
    frs_return_t ret;

    client_buffer_count_ = 0;
    server_buffer_count_ = 0;
    client_packet_count_ = 0;
    server_packet_count_ = 0;
    last_packet_ = 0;
    turns_ = 0;

    if (follower_) {
        ret = readFollowStream();
    } else {
        ret = (frs_return_t)0;
        ws_assert_not_reached();
    }

    ui->teStreamContent->moveCursor(QTextCursor::Start);

    return ret;
}

void
FollowStreamDialog::followStream()
{
    readStream();
}

const int FollowStreamDialog::max_document_length_ = 500 * 1000 * 1000; // Just a guess
void FollowStreamDialog::addText(QString text, gboolean is_from_server, guint32 packet_num, gboolean colorize)
{
    if (truncated_) {
        return;
    }

    int char_count = ui->teStreamContent->document()->characterCount();
    if (char_count + text.length() > max_document_length_) {
        text.truncate(max_document_length_ - char_count);
        truncated_ = true;
    }

    setUpdatesEnabled(false);
    int cur_pos = ui->teStreamContent->verticalScrollBar()->value();
    ui->teStreamContent->moveCursor(QTextCursor::End);

    QTextCharFormat tcf = ui->teStreamContent->currentCharFormat();
    if (!colorize) {
        tcf.setBackground(palette().window().color());
        tcf.setForeground(palette().windowText().color());
    } else if (is_from_server) {
        tcf.setForeground(ColorUtils::fromColorT(prefs.st_server_fg));
        tcf.setBackground(ColorUtils::fromColorT(prefs.st_server_bg));
    } else {
        tcf.setForeground(ColorUtils::fromColorT(prefs.st_client_fg));
        tcf.setBackground(ColorUtils::fromColorT(prefs.st_client_bg));
    }
    ui->teStreamContent->setCurrentCharFormat(tcf);

    ui->teStreamContent->insertPlainText(text);
    text_pos_to_packet_[ui->teStreamContent->textCursor().anchor()] = packet_num;

    if (truncated_) {
        tcf = ui->teStreamContent->currentCharFormat();
        tcf.setBackground(palette().window().color());
        tcf.setForeground(palette().windowText().color());
        ui->teStreamContent->insertPlainText("\n" + tr("[Stream output truncated]"));
        ui->teStreamContent->moveCursor(QTextCursor::End);
    } else {
        ui->teStreamContent->verticalScrollBar()->setValue(cur_pos);
    }
    setUpdatesEnabled(true);
}

// The following keyboard shortcuts should work (although
// they may not work consistently depending on focus):
// / (slash), Ctrl-F - Focus and highlight the search box
// Ctrl-G, Ctrl-N, F3 - Find next
// Should we make it so that typing any text starts searching?
bool FollowStreamDialog::eventFilter(QObject *, QEvent *event)
{
    if (ui->teStreamContent->hasFocus() && event->type() == QEvent::KeyPress) {
        QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
        if (keyEvent->matches(QKeySequence::SelectAll) || keyEvent->matches(QKeySequence::Copy)
                || keyEvent->text().isEmpty()) {
            return false;
        }
        ui->leFind->setFocus();
        if (keyEvent->matches(QKeySequence::Find)) {
            return true;
        } else if (keyEvent->matches(QKeySequence::FindNext)) {
            findText();
            return true;
        }
    }

    return false;
}

void FollowStreamDialog::keyPressEvent(QKeyEvent *event)
{
    if (ui->leFind->hasFocus()) {
        if (event->key() == Qt::Key_Enter || event->key() == Qt::Key_Return) {
            findText();
            return;
        }
    } else {
        if (event->key() == Qt::Key_Slash || event->matches(QKeySequence::Find)) {
            ui->leFind->setFocus();
            ui->leFind->selectAll();
        }
        return;
    }

    if (event->key() == Qt::Key_F3 || (event->key() == Qt::Key_N && event->modifiers() & Qt::ControlModifier)) {
        findText();
        return;
    }

    QDialog::keyPressEvent(event);
}

static inline void sanitize_buffer(char *buffer, size_t nchars) {
    for (size_t i = 0; i < nchars; i++) {
        if (buffer[i] == '\n' || buffer[i] == '\r' || buffer[i] == '\t')
            continue;
        if (! g_ascii_isprint((guchar)buffer[i])) {
            buffer[i] = '.';
        }
    }
}

frs_return_t
FollowStreamDialog::showBuffer(char *buffer, size_t nchars, gboolean is_from_server, guint32 packet_num,
                                nstime_t abs_ts, guint32 *global_pos)
{
    gchar initbuf[256];
    guint32 current_pos;
    static const gchar hexchars[16] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};

    switch (recent.gui_follow_show) {

    case SHOW_EBCDIC:
    {
        /* If our native arch is ASCII, call: */
        EBCDIC_to_ASCII((guint8*)buffer, (guint) nchars);
        sanitize_buffer(buffer, nchars);
        QByteArray ba = QByteArray(buffer, (int)nchars);
        addText(ba, is_from_server, packet_num);
        break;
    }

    case SHOW_ASCII:
    {
        /* If our native arch is EBCDIC, call:
         * ASCII_TO_EBCDIC(buffer, nchars);
         */
        sanitize_buffer(buffer, nchars);
        QByteArray ba = QByteArray(buffer, (int)nchars);
        addText(ba, is_from_server, packet_num);
        break;
    }

    case SHOW_CODEC:
    {
        // This assumes that multibyte characters don't span packets in the
        // stream. To handle that case properly (which might occur with fixed
        // block sizes, e.g. transferring over TFTP, we would need to create
        // two stateful QTextDecoders, one for each direction, presumably in
        // on_cbCharset_currentIndexChanged()
        QTextCodec *codec = QTextCodec::codecForName(ui->cbCharset->currentText().toUtf8());
        QByteArray ba = QByteArray(buffer, (int)nchars);
        QString decoded = codec->toUnicode(ba);
        addText(decoded, is_from_server, packet_num);
        break;
    }

    case SHOW_HEXDUMP:
        current_pos = 0;
        while (current_pos < nchars) {
            gchar hexbuf[256];
            int i;
            gchar *cur = hexbuf, *ascii_start;

            /* is_from_server indentation : put 4 spaces at the
             * beginning of the string */
            /* XXX - We might want to prepend each line with "C" or "S" instead. */
            if (is_from_server && follow_info_.show_stream == BOTH_HOSTS) {
                memset(cur, ' ', 4);
                cur += 4;
            }
            cur += snprintf(cur, 20, "%08X  ", *global_pos);
            /* 49 is space consumed by hex chars */
            ascii_start = cur + 49 + 2;
            for (i = 0; i < 16 && current_pos + i < nchars; i++) {
                *cur++ =
                        hexchars[(buffer[current_pos + i] & 0xf0) >> 4];
                *cur++ =
                        hexchars[buffer[current_pos + i] & 0x0f];
                *cur++ = ' ';
                if (i == 7)
                    *cur++ = ' ';
            }
            /* Fill it up if column isn't complete */
            while (cur < ascii_start)
                *cur++ = ' ';

            /* Now dump bytes as text */
            for (i = 0; i < 16 && current_pos + i < nchars; i++) {
                *cur++ =
                        (g_ascii_isprint((guchar)buffer[current_pos + i]) ?
                            buffer[current_pos + i] : '.');
                if (i == 7) {
                    *cur++ = ' ';
                }
            }
            current_pos += i;
            (*global_pos) += i;
            *cur++ = '\n';
            *cur = 0;

            addText(hexbuf, is_from_server, packet_num);
        }
        break;

    case SHOW_CARRAY:
        current_pos = 0;
        snprintf(initbuf, sizeof(initbuf), "char peer%d_%d[] = { /* Packet %u */\n",
                   is_from_server ? 1 : 0,
                   is_from_server ? server_buffer_count_++ : client_buffer_count_++,
                   packet_num);
        addText(initbuf, is_from_server, packet_num);

        while (current_pos < nchars) {
            gchar hexbuf[256];
            int i, cur;

            cur = 0;
            for (i = 0; i < 8 && current_pos + i < nchars; i++) {
                /* Prepend entries with "0x" */
                hexbuf[cur++] = '0';
                hexbuf[cur++] = 'x';
                hexbuf[cur++] =
                        hexchars[(buffer[current_pos + i] & 0xf0) >> 4];
                hexbuf[cur++] =
                        hexchars[buffer[current_pos + i] & 0x0f];

                /* Delimit array entries with a comma */
                if (current_pos + i + 1 < nchars)
                    hexbuf[cur++] = ',';

                hexbuf[cur++] = ' ';
            }

            /* Terminate the array if we are at the end */
            if (current_pos + i == nchars) {
                hexbuf[cur++] = '}';
                hexbuf[cur++] = ';';
            }

            current_pos += i;
            (*global_pos) += i;
            hexbuf[cur++] = '\n';
            hexbuf[cur] = 0;
            addText(hexbuf, is_from_server, packet_num);
        }
        break;

    case SHOW_YAML:
    {
        QString yaml_text;

        const int base64_raw_len = 57; // Encodes to 76 bytes, common in RFCs
        current_pos = 0;

        if (last_packet_ == 0) {
            // Header with general info about peers
            const char *hostname0 = address_to_name(&follow_info_.client_ip);
            const char *hostname1 = address_to_name(&follow_info_.server_ip);

            char *port0 = get_follow_port_to_display(follower_)(NULL, follow_info_.client_port);
            char *port1 = get_follow_port_to_display(follower_)(NULL, follow_info_.server_port);

            addText("peers:\n", false, 0, false);

            addText(QString(
                "  - peer: 0\n"
                "    host: %1\n"
                "    port: %2\n")
                .arg(hostname0)
                .arg(port0), false, 0);

            addText(QString(
                "  - peer: 1\n"
                "    host: %1\n"
                "    port: %2\n")
                .arg(hostname1)
                .arg(port1), true, 0);

            wmem_free(NULL, port0);
            wmem_free(NULL, port1);

            addText("packets:\n", false, 0, false);
        }

        if (packet_num != last_packet_) {
            yaml_text.append(QString("  - packet: %1\n")
                    .arg(packet_num));
            yaml_text.append(QString("    peer: %1\n")
                    .arg(is_from_server ? 1 : 0));
            yaml_text.append(QString("    index: %1\n")
                    .arg(is_from_server ? server_buffer_count_++ : client_buffer_count_++));
            yaml_text.append(QString("    timestamp: %1.%2\n")
                    .arg(abs_ts.secs)
                    .arg(abs_ts.nsecs, 9, 10, QChar('0')));
            yaml_text.append(QString("    data: !!binary |\n"));
        }
        while (current_pos < nchars) {
            int len = current_pos + base64_raw_len < nchars ? base64_raw_len : (int) nchars - current_pos;
            QByteArray base64_data(&buffer[current_pos], len);

            /* XXX: GCC 12.1 has a bogus stringop-overread warning using the Qt
             * conversions from QByteArray to QString at -O2 and higher due to
             * computing a branch that will never be taken.
             */
#if WS_IS_AT_LEAST_GNUC_VERSION(12,1)
DIAG_OFF(stringop-overread)
#endif
            yaml_text += "      " + base64_data.toBase64() + "\n";
#if WS_IS_AT_LEAST_GNUC_VERSION(12,1)
DIAG_ON(stringop-overread)
#endif

            current_pos += len;
            (*global_pos) += len;
        }
        addText(yaml_text, is_from_server, packet_num);
        break;
    }

    case SHOW_RAW:
    {
        QByteArray ba = QByteArray(buffer, (int)nchars).toHex();
        ba += '\n';
        addText(ba, is_from_server, packet_num);
        break;
    }

    default:
        /* The other Show types are supported in Show Packet Bytes but
         * not here in Follow. (XXX: Maybe some could be added?)
         */
        ws_assert_not_reached();
    }

    if (last_packet_ == 0) {
        last_from_server_ = is_from_server;
    }

    if (packet_num != last_packet_) {
        last_packet_ = packet_num;
        if (is_from_server) {
            server_packet_count_++;
        } else {
            client_packet_count_++;
        }
        if (last_from_server_ != is_from_server) {
            last_from_server_ = is_from_server;
            turns_++;
        }
    }

    return FRS_OK;
}

bool FollowStreamDialog::follow(QString previous_filter, bool use_stream_index, guint stream_num, guint sub_stream_num)
{
    QString             follow_filter;
    const char          *hostname0 = NULL, *hostname1 = NULL;
    char                *port0 = NULL, *port1 = NULL;
    QString             server_to_client_string;
    QString             client_to_server_string;
    QString             both_directions_string;
    gboolean            is_follower = FALSE;
    int                 stream_count;
    follow_stream_count_func stream_count_func = NULL;

    resetStream();

    if (file_closed_)
    {
        QMessageBox::warning(this, tr("No capture file."), tr("Please make sure you have a capture file opened."));
        return false;
    }

    if (!use_stream_index) {
        if (cap_file_.capFile()->edt == NULL)
        {
            QMessageBox::warning(this, tr("Error following stream."), tr("Capture file invalid."));
            return false;
        }
        is_follower = proto_is_frame_protocol(cap_file_.capFile()->edt->pi.layers, proto_get_protocol_filter_name(get_follow_proto_id(follower_)));
        if (!is_follower) {
            QMessageBox::warning(this, tr("Error following stream."), tr("Please make sure you have a %1 packet selected.").arg
                                    (proto_get_protocol_short_name(find_protocol_by_id(get_follow_proto_id(follower_)))));
            return false;
        }
    }

    follow_reset_stream(&follow_info_);

    /* Create a new filter that matches all packets in the TCP stream,
        and set the display filter entry accordingly */
    if (use_stream_index) {
        follow_filter = gchar_free_to_qstring(get_follow_index_func(follower_)(stream_num, sub_stream_num));
    } else {
        follow_filter = gchar_free_to_qstring(get_follow_conv_func(follower_)(cap_file_.capFile()->edt, &cap_file_.capFile()->edt->pi, &stream_num, &sub_stream_num));
    }
    if (follow_filter.isEmpty()) {
        // XXX: This error probably has to do with tunneling (#18231), where
        // the addresses or ports changed after the TCP or UDP layer.
        // (The appropriate layer must be present, or else the GUI
        // doesn't allow the option to be selected.)
        QMessageBox::warning(this,
                             tr("Error creating filter for this stream."),
                             tr("%1 stream not found on the selected packet.").arg(proto_get_protocol_short_name(find_protocol_by_id(get_follow_proto_id(follower_)))));
        return false;
    }

    previous_filter_ = previous_filter;
    /* append the negation */
    if (!previous_filter.isEmpty()) {
        filter_out_filter_ = QString("%1 and !(%2)")
                .arg(previous_filter).arg(follow_filter);
    }
    else
    {
        filter_out_filter_ = QString("!(%1)").arg(follow_filter);
    }

    follow_info_.substream_id = sub_stream_num;

    /* data will be passed via tap callback*/
    if (!registerTapListener(get_follow_tap_string(follower_), &follow_info_,
                                follow_filter.toUtf8().constData(),
                                0, NULL, get_follow_tap_handler(follower_), NULL)) {
        return false;
    }

    stream_count_func = get_follow_stream_count_func(follower_);

    if (stream_count_func == NULL) {
        removeStreamControls();
    } else {
        stream_count = stream_count_func();
        ui->streamNumberSpinBox->blockSignals(true);
        ui->streamNumberSpinBox->setMaximum(stream_count-1);
        ui->streamNumberSpinBox->setValue(stream_num);
        ui->streamNumberSpinBox->blockSignals(false);
        ui->streamNumberSpinBox->setToolTip(tr("%Ln total stream(s).", "", stream_count));
        ui->streamNumberLabel->setToolTip(ui->streamNumberSpinBox->toolTip());
    }

    follow_sub_stream_id_func sub_stream_func;
    sub_stream_func = get_follow_sub_stream_id_func(follower_);
    if (sub_stream_func != NULL) {
        guint substream_max_id = 0;
        sub_stream_func(static_cast<guint>(stream_num), G_MAXINT32, TRUE, &substream_max_id);
        stream_count = static_cast<gint>(substream_max_id);
        ui->subStreamNumberSpinBox->blockSignals(true);
        ui->subStreamNumberSpinBox->setEnabled(true);
        ui->subStreamNumberSpinBox->setMaximum(stream_count);
        ui->subStreamNumberSpinBox->setValue(sub_stream_num);
        ui->subStreamNumberSpinBox->blockSignals(false);
        ui->subStreamNumberSpinBox->setToolTip(tr("Max sub stream ID for the selected stream: %Ln", "", stream_count));
        ui->subStreamNumberSpinBox->setToolTip(ui->subStreamNumberSpinBox->toolTip());
        ui->subStreamNumberSpinBox->setVisible(true);
        ui->subStreamNumberLabel->setVisible(true);
    } else {
        /* disable substream spin box for protocols without substreams */
        ui->subStreamNumberSpinBox->blockSignals(true);
        ui->subStreamNumberSpinBox->setEnabled(false);
        ui->subStreamNumberSpinBox->setValue(0);
        ui->subStreamNumberSpinBox->setKeyboardTracking(false);
        ui->subStreamNumberSpinBox->blockSignals(false);
        ui->subStreamNumberSpinBox->setVisible(false);
        ui->subStreamNumberLabel->setVisible(false);
    }

    beginRetapPackets();
    updateWidgets(true);

    /* Run the display filter so it goes in effect - even if it's the
       same as the previous display filter. */
    emit updateFilter(follow_filter, TRUE);

    removeTapListeners();

    hostname0 = address_to_name(&follow_info_.client_ip);
    hostname1 = address_to_name(&follow_info_.server_ip);

    port0 = get_follow_port_to_display(follower_)(NULL, follow_info_.client_port);
    port1 = get_follow_port_to_display(follower_)(NULL, follow_info_.server_port);

    server_to_client_string =
            QString("%1:%2 %3 %4:%5 (%6)")
            .arg(hostname0).arg(port0)
            .arg(UTF8_RIGHTWARDS_ARROW)
            .arg(hostname1).arg(port1)
            .arg(gchar_free_to_qstring(format_size(
                                            follow_info_.bytes_written[0],
                                        FORMAT_SIZE_UNIT_BYTES, FORMAT_SIZE_PREFIX_SI)));

    client_to_server_string =
            QString("%1:%2 %3 %4:%5 (%6)")
            .arg(hostname1).arg(port1)
            .arg(UTF8_RIGHTWARDS_ARROW)
            .arg(hostname0).arg(port0)
            .arg(gchar_free_to_qstring(format_size(
                                            follow_info_.bytes_written[1],
                                        FORMAT_SIZE_UNIT_BYTES, FORMAT_SIZE_PREFIX_SI)));

    wmem_free(NULL, port0);
    wmem_free(NULL, port1);

    both_directions_string = tr("Entire conversation (%1)")
            .arg(gchar_free_to_qstring(format_size(
                                            follow_info_.bytes_written[0] + follow_info_.bytes_written[1],
                    FORMAT_SIZE_UNIT_BYTES, FORMAT_SIZE_PREFIX_SI)));
    setWindowSubtitle(tr("Follow %1 Stream (%2)").arg(proto_get_protocol_short_name(find_protocol_by_id(get_follow_proto_id(follower_))))
                                                 .arg(follow_filter));

    ui->cbDirections->blockSignals(true);
    ui->cbDirections->clear();
    ui->cbDirections->addItem(both_directions_string);
    ui->cbDirections->addItem(client_to_server_string);
    ui->cbDirections->addItem(server_to_client_string);
    ui->cbDirections->blockSignals(false);

    followStream();
    fillHintLabel(-1);

    updateWidgets(false);
    endRetapPackets();

    if (prefs.restore_filter_after_following_stream) {
        emit updateFilter(previous_filter_, TRUE);
    }

    return true;
}

void FollowStreamDialog::captureFileClosed()
{
    QString tooltip = tr("File closed.");
    ui->streamNumberSpinBox->setToolTip(tooltip);
    ui->streamNumberLabel->setToolTip(tooltip);
    WiresharkDialog::captureFileClosed();
}

/*
 * XXX - the routine pointed to by "print_line_fcn_p" doesn't get handed lines,
 * it gets handed bufferfuls.  That's fine for "follow_write_raw()"
 * and "follow_add_to_gtk_text()", but, as "follow_print_text()" calls
 * the "print_line()" routine from "print.c", and as that routine might
 * genuinely expect to be handed a line (if, for example, it's using
 * some OS or desktop environment's printing API, and that API expects
 * to be handed lines), "follow_print_text()" should probably accumulate
 * lines in a buffer and hand them "print_line()".  (If there's a
 * complete line in a buffer - i.e., there's nothing of the line in
 * the previous buffer or the next buffer - it can just hand that to
 * "print_line()" after filtering out non-printables, as an
 * optimization.)
 *
 * This might or might not be the reason why C arrays display
 * correctly but get extra blank lines very other line when printed.
 */
frs_return_t
FollowStreamDialog::readFollowStream()
{
    guint32 global_client_pos = 0, global_server_pos = 0;
    guint32 *global_pos;
    gboolean skip;
    GList* cur;
    frs_return_t frs_return;
    follow_record_t *follow_record;
    QElapsedTimer elapsed_timer;

    elapsed_timer.start();

    loop_break_mutex.lock();
    isReadRunning = TRUE;
    loop_break_mutex.unlock();

    for (cur = g_list_last(follow_info_.payload); cur; cur = g_list_previous(cur)) {
        if (dialogClosed() || !isReadRunning) break;

        follow_record = (follow_record_t *)cur->data;
        skip = FALSE;
        if (!follow_record->is_server) {
            global_pos = &global_client_pos;
            if (follow_info_.show_stream == FROM_SERVER) {
                skip = TRUE;
            }
        } else {
            global_pos = &global_server_pos;
            if (follow_info_.show_stream == FROM_CLIENT) {
                skip = TRUE;
            }
        }

        QByteArray buffer;
        if (!skip) {
            // We want a deep copy.
            buffer.clear();
            buffer.append((const char *) follow_record->data->data,
                                     follow_record->data->len);
            frs_return = showBuffer(
                        buffer.data(),
                        follow_record->data->len,
                        follow_record->is_server,
                        follow_record->packet_num,
                        follow_record->abs_ts,
                        global_pos);
            if (frs_return == FRS_PRINT_ERROR)
                return frs_return;
            if (elapsed_timer.elapsed() > info_update_freq_) {
                fillHintLabel(ui->teStreamContent->textCursor().position());
                mainApp->processEvents();
                elapsed_timer.start();
            }
        }
    }

    loop_break_mutex.lock();
    isReadRunning = FALSE;
    loop_break_mutex.unlock();

    return FRS_OK;
}