summaryrefslogtreecommitdiffstats
path: root/kioslave/nntp/nntp.cpp
blob: b109bb58a0a906a9594c08d3ca4a1332f03d6128 (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
/* This file is part of KDE
   Copyright (C) 2000 by Wolfram Diestel <wolfram@steloj.de>
   Copyright (C) 2005 by Tim Way <tim@way.hrcoxmail.com>
   Copyright (C) 2005 by Volker Krause <volker.krause@rwth-aachen.de>

   This is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.
*/

#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>

#include <tqdir.h>
#include <tqregexp.h>

#include <kinstance.h>
#include <kdebug.h>
#include <kglobal.h>
#include <klocale.h>

#include "nntp.h"

#define NNTP_PORT 119
#define NNTPS_PORT 563

#define UDS_ENTRY_CHUNK 50 // so much entries are sent at once in listDir

#define DBG_AREA 7114
#define DBG kdDebug(DBG_AREA)
#define ERR kdError(DBG_AREA)
#define WRN kdWarning(DBG_AREA)
#define FAT kdFatal(DBG_AREA)

using namespace KIO;

extern "C" { int KDE_EXPORT kdemain(int argc, char **argv); }

int kdemain(int argc, char **argv) {

  KInstance instance ("kio_nntp");
  if (argc != 4) {
    fprintf(stderr, "Usage: kio_nntp protocol domain-socket1 domain-socket2\n");
    exit(-1);
  }

  NNTPProtocol *slave;

  // Are we going to use SSL?
  if (strcasecmp(argv[1], "nntps") == 0) {
    slave = new NNTPProtocol(argv[2], argv[3], true);
  } else {
    slave = new NNTPProtocol(argv[2], argv[3], false);
  }

  slave->dispatchLoop();
  delete slave;

  return 0;
}

/****************** NNTPProtocol ************************/

NNTPProtocol::NNTPProtocol ( const TQCString & pool, const TQCString & app, bool isSSL )
  : TCPSlaveBase( (isSSL ? NNTPS_PORT : NNTP_PORT), (isSSL ? "nntps" : "nntp"), pool,
                  app, isSSL )
{
  DBG << "=============> NNTPProtocol::NNTPProtocol" << endl;

  m_bIsSSL = isSSL;
  readBufferLen = 0;
  m_iDefaultPort = m_bIsSSL ? NNTPS_PORT : NNTP_PORT;
  m_iPort = m_iDefaultPort;
}

NNTPProtocol::~NNTPProtocol() {
  DBG << "<============= NNTPProtocol::~NNTPProtocol" << endl;

  // close connection
  nntp_close();
}

void NNTPProtocol::setHost ( const TQString & host, int port, const TQString & user,
                             const TQString & pass )
{
  DBG << "setHost: " << ( ! user.isEmpty() ? (user+"@") : TQString(""))
      << host << ":" << ( ( port == 0 ) ? m_iDefaultPort : port  ) << endl;

  if ( isConnectionValid() && (mHost != host || m_iPort != port ||
       mUser != user || mPass != pass) )
    nntp_close();

  mHost = host;
  m_iPort = ( ( port == 0 ) ? m_iDefaultPort : port );
  mUser = user;
  mPass = pass;
}

void NNTPProtocol::get(const KURL& url) {
  DBG << "get " << url.prettyURL() << endl;
  TQString path = TQDir::cleanDirPath(url.path());
  TQRegExp regMsgId = TQRegExp("^\\/?[a-z0-9\\.\\-_]+\\/<\\S+>$", false);
  int pos;
  TQString group;
  TQString msg_id;

  // path should be like: /group/<msg_id>
  if (regMsgId.search(path) != 0) {
    error(ERR_DOES_NOT_EXIST,path);
    return;
  }

  pos = path.find('<');
  group = path.left(pos);
  msg_id = KURL::decode_string( path.right(path.length()-pos) );
  if (group.left(1) == "/") group.remove(0,1);
  if ((pos = group.find('/')) > 0) group = group.left(pos);
  DBG << "get group: " << group << " msg: " << msg_id << endl;

  if ( !nntp_open() )
    return;

  // select group
  int res_code = sendCommand( "GROUP " + group );
  if (res_code == 411){
    error(ERR_DOES_NOT_EXIST, path);
    return;
  } else if (res_code != 211) {
    unexpected_response(res_code,"GROUP");
    return;
  }

  // get article
  res_code = sendCommand( "ARTICLE " + msg_id );
  if (res_code == 430) {
    error(ERR_DOES_NOT_EXIST,path);
    return;
  } else if (res_code != 220) {
    unexpected_response(res_code,"ARTICLE");
    return;
  }

  // read and send data
  TQCString line;
  TQByteArray buffer;
  char tmp[MAX_PACKET_LEN];
  int len = 0;
  while ( true ) {
    if ( !waitForResponse( readTimeout() ) ) {
      error( ERR_SERVER_TIMEOUT, mHost );
      return;
    }
    memset( tmp, 0, MAX_PACKET_LEN );
    len = readLine( tmp, MAX_PACKET_LEN );
    line = tmp;
    if ( len <= 0 )
      break;
    if ( line == ".\r\n" )
      break;
    if ( line.left(2) == ".." )
      line.remove( 0, 1 );
    // cannot use TQCString, it would send the 0-terminator too
    buffer.setRawData( line.data(), line.length() );
    data( buffer );
    buffer.resetRawData( line.data(), line.length() );
  }
  // end of data
  buffer.resize(0);
  data(buffer);

  // finish
  finished();
}

void NNTPProtocol::put( const KURL &/*url*/, int /*permissions*/, bool /*overwrite*/, bool /*resume*/ )
{
  if ( !nntp_open() )
    return;
  if ( post_article() )
    finished();
}

void NNTPProtocol::special(const TQByteArray& data) {
  // 1 = post article
  int cmd;
  TQDataStream stream(data, IO_ReadOnly);

  if ( !nntp_open() )
    return;

  stream >> cmd;
  if (cmd == 1) {
    if (post_article()) finished();
  } else {
    error(ERR_UNSUPPORTED_ACTION,i18n("Invalid special command %1").arg(cmd));
  }
}

bool NNTPProtocol::post_article() {
  DBG << "post article " << endl;

  // send post command
  int res_code = sendCommand( "POST" );
  if (res_code == 440) { // posting not allowed
    error(ERR_WRITE_ACCESS_DENIED, mHost);
    return false;
  } else if (res_code != 340) { // 340: ok, send article
    unexpected_response(res_code,"POST");
    return false;
  }

  // send article now
  int result;
  bool last_chunk_had_line_ending = true;
  do {
    TQByteArray buffer;
    TQCString data;
    dataReq();
    result = readData(buffer);
    // treat the buffer data
    if (result>0) {
      data = TQCString(buffer.data(),buffer.size()+1);
      // translate "\r\n." to "\r\n.."
      int pos=0;
      if (last_chunk_had_line_ending && data[0] == '.') {
        data.insert(0,'.');
        pos += 2;
      }
      last_chunk_had_line_ending = (data.right(2) == "\r\n");
      while ((pos = data.find("\r\n.",pos)) > 0) {
        data.insert(pos+2,'.');
        pos += 4;
      }

      // send data to socket, write() doesn't send the terminating 0
      write( data.data(), data.length() );
    }
  } while (result>0);

  // error occurred?
  if (result<0) {
    ERR << "error while getting article data for posting" << endl;
    nntp_close();
    return false;
  }

  // send end mark
  write( "\r\n.\r\n", 5 );

  // get answer
  res_code = evalResponse( readBuffer, readBufferLen );
  if (res_code == 441) { // posting failed
    error(ERR_COULD_NOT_WRITE, mHost);
    return false;
  } else if (res_code != 240) {
    unexpected_response(res_code,"POST");
    return false;
  }

  return true;
}


void NNTPProtocol::stat( const KURL& url ) {
  DBG << "stat " << url.prettyURL() << endl;
  UDSEntry entry;
  TQString path = TQDir::cleanDirPath(url.path());
  TQRegExp regGroup = TQRegExp("^\\/?[a-z0-9\\.\\-_]+\\/?$",false);
  TQRegExp regMsgId = TQRegExp("^\\/?[a-z0-9\\.\\-_]+\\/<\\S+>$", false);
  int pos;
  TQString group;
  TQString msg_id;

  // / = group list
  if (path.isEmpty() || path == "/") {
    DBG << "stat root" << endl;
    fillUDSEntry(entry, TQString::null, 0, postingAllowed, false);

  // /group = message list
  } else if (regGroup.search(path) == 0) {
    if (path.left(1) == "/") path.remove(0,1);
    if ((pos = path.find('/')) > 0) group = path.left(pos);
    else group = path;
    DBG << "stat group: " << group << endl;
    // postingAllowed should be ored here with "group not moderated" flag
    // as size the num of messages (GROUP cmd) could be given
    fillUDSEntry(entry, group, 0, postingAllowed, false);

  // /group/<msg_id> = message
  } else if (regMsgId.search(path) == 0) {
    pos = path.find('<');
    group = path.left(pos);
    msg_id = KURL::decode_string( path.right(path.length()-pos) );
    if (group.left(1) == "/") group.remove(0,1);
    if ((pos = group.find('/')) > 0) group = group.left(pos);
    DBG << "stat group: " << group << " msg: " << msg_id << endl;
    fillUDSEntry(entry, msg_id, 0, false, true);

  // invalid url
  } else {
    error(ERR_DOES_NOT_EXIST,path);
    return;
  }

  statEntry(entry);
  finished();
}

void NNTPProtocol::listDir( const KURL& url ) {
  DBG << "listDir " << url.prettyURL() << endl;
  if ( !nntp_open() )
    return;

  TQString path = TQDir::cleanDirPath(url.path());

  if (path.isEmpty())
  {
    KURL newURL(url);
    newURL.setPath("/");
    DBG << "listDir redirecting to " << newURL.prettyURL() << endl;
    redirection(newURL);
    finished();
    return;
  }
  else if ( path == "/" ) {
    fetchGroups( url.queryItem( "since" ) );
    finished();
  } else {
    // if path = /group
    int pos;
    TQString group;
    if (path.left(1) == "/")
      path.remove(0,1);
    if ((pos = path.find('/')) > 0)
      group = path.left(pos);
    else
      group = path;
    TQString first = url.queryItem( "first" );
    if ( fetchGroup( group, first.toULong() ) )
      finished();
  }
}

void NNTPProtocol::fetchGroups( const TQString &since )
{
  int expected;
  int res;
  if ( since.isEmpty() ) {
    // full listing
    res = sendCommand( "LIST" );
    expected = 215;
  } else {
    // incremental listing
    res = sendCommand( "NEWGROUPS " + since );
    expected = 231;
  }
  if ( res != expected ) {
    unexpected_response( res, "LIST" );
    return;
  }

  // read newsgroups line by line
  TQCString line, group;
  int pos, pos2;
  long msg_cnt;
  bool moderated;
  UDSEntry entry;
  UDSEntryList entryList;

  // read in data and process each group. one line at a time
  while ( true ) {
    if ( ! waitForResponse( readTimeout() ) ) {
      error( ERR_SERVER_TIMEOUT, mHost );
      return;
    }
    memset( readBuffer, 0, MAX_PACKET_LEN );
    readBufferLen = readLine ( readBuffer, MAX_PACKET_LEN );
    line = readBuffer;
    if ( line == ".\r\n" )
      break;

    DBG << "  fetchGroups -- data: " << line.stripWhiteSpace() << endl;

    // group name
    if ((pos = line.find(' ')) > 0) {

      group = line.left(pos);

      // number of messages
      line.remove(0,pos+1);
      long last = 0;
      if (((pos = line.find(' ')) > 0 || (pos = line.find('\t')) > 0) &&
          ((pos2 = line.find(' ',pos+1)) > 0 || (pos2 = line.find('\t',pos+1)) > 0)) {
        last = line.left(pos).toLong();
        long first = line.mid(pos+1,pos2-pos-1).toLong();
        msg_cnt = abs(last-first+1);
        // moderated group?
        moderated = (line[pos2+1] == 'n');
      } else {
        msg_cnt = 0;
        moderated = false;
      }

      fillUDSEntry(entry, group, msg_cnt, postingAllowed && !moderated, false);
      // add the last serial number as UDS_EXTRA atom, this is needed for
      // incremental article listing
      UDSAtom atom;
      atom.m_uds = UDS_EXTRA;
      atom.m_str = TQString::number( last );
      entry.append( atom );
      entryList.append(entry);

      if (entryList.count() >= UDS_ENTRY_CHUNK) {
        listEntries(entryList);
        entryList.clear();
      }
    }
  }

  // send rest of entryList
  if (entryList.count() > 0) listEntries(entryList);
}

bool NNTPProtocol::fetchGroup( TQString &group, unsigned long first ) {
  int res_code;
  TQString resp_line;

  // select group
  res_code = sendCommand( "GROUP " + group );
  if (res_code == 411){
    error(ERR_DOES_NOT_EXIST,group);
    return false;
  } else if (res_code != 211) {
    unexpected_response(res_code,"GROUP");
    return false;
  }

  // repsonse to "GROUP <requested-group>" command is 211 then find the message count (cnt)
  // and the first and last message followed by the group name
  int pos, pos2;
  unsigned long firstSerNum;
  resp_line = readBuffer;
  if (((pos = resp_line.find(' ',4)) > 0 || (pos = resp_line.find('\t',4)) > 0) &&
      ((pos2 = resp_line.find(' ',pos+1)) > 0 || (pos = resp_line.find('\t',pos+1)) > 0))
  {
    firstSerNum = resp_line.mid(pos+1,pos2-pos-1).toLong();
  } else {
    error(ERR_INTERNAL,i18n("Could not extract first message number from server response:\n%1").
      arg(resp_line));
    return false;
  }

  if (firstSerNum == 0L)
    return true;
  first = kMax( first, firstSerNum );
  DBG << "Starting from serial number: " << first << " of " << firstSerNum << endl;

  bool notSupported = true;
  if ( fetchGroupXOVER( first, notSupported ) )
    return true;
  else if ( notSupported )
    return fetchGroupRFC977( first );
  return false;
}


bool NNTPProtocol::fetchGroupRFC977( unsigned long first )
{
  UDSEntry entry;
  UDSEntryList entryList;

  // set article pointer to first article and get msg-id of it
  int res_code = sendCommand( "STAT " + TQString::number( first ) );
  TQString resp_line = readBuffer;
  if (res_code != 223) {
    unexpected_response(res_code,"STAT");
    return false;
  }

  //STAT res_line: 223 nnn <msg_id> ...
  TQString msg_id;
  int pos, pos2;
  if ((pos = resp_line.find('<')) > 0 && (pos2 = resp_line.find('>',pos+1))) {
    msg_id = resp_line.mid(pos,pos2-pos+1);
    fillUDSEntry(entry, msg_id, 0, false, true);
    entryList.append(entry);
  } else {
    error(ERR_INTERNAL,i18n("Could not extract first message id from server response:\n%1").
      arg(resp_line));
    return false;
  }

  // go through all articles
  while (true) {
    res_code = sendCommand("NEXT");
    if (res_code == 421) {
      // last article reached
      if ( !entryList.isEmpty() )
        listEntries( entryList );
      return true;
    } else if (res_code != 223) {
      unexpected_response(res_code,"NEXT");
      return false;
    }

    //res_line: 223 nnn <msg_id> ...
    resp_line = readBuffer;
    if ((pos = resp_line.find('<')) > 0 && (pos2 = resp_line.find('>',pos+1))) {
      msg_id = resp_line.mid(pos,pos2-pos+1);
      fillUDSEntry(entry, msg_id, 0, false, true);
      entryList.append(entry);
      if (entryList.count() >= UDS_ENTRY_CHUNK) {
        listEntries(entryList);
        entryList.clear();
      }
    } else {
      error(ERR_INTERNAL,i18n("Could not extract message id from server response:\n%1").
        arg(resp_line));
      return false;
    }
  }
  return true; // Not reached
}


bool NNTPProtocol::fetchGroupXOVER( unsigned long first, bool &notSupported )
{
  notSupported = false;

  TQString line;
  TQStringList headers;

  int res = sendCommand( "LIST OVERVIEW.FMT" );
  if ( res == 215 ) {
    while ( true ) {
      if ( ! waitForResponse( readTimeout() ) ) {
        error( ERR_SERVER_TIMEOUT, mHost );
        return false;
      }
      memset( readBuffer, 0, MAX_PACKET_LEN );
      readBufferLen = readLine ( readBuffer, MAX_PACKET_LEN );
      line = readBuffer;
      if ( line == ".\r\n" )
        break;
      headers << line.stripWhiteSpace();
      DBG << "OVERVIEW.FMT: " << line.stripWhiteSpace() << endl;
    }
  } else {
    // fallback to defaults
    headers << "Subject:" << "From:" << "Date:" << "Message-ID:"
        << "References:" << "Bytes:" << "Lines:";
  }

  res = sendCommand( "XOVER " + TQString::number( first ) + "-" );
  if ( res == 420 )
    return true; // no articles selected
  if ( res == 500 )
    notSupported = true; // unknwon command
  if ( res != 224 )
    return false;

  long msgSize;
  TQString msgId;
  UDSAtom atom;
  UDSEntry entry;
  UDSEntryList entryList;

  TQStringList fields;
  while ( true ) {
    if ( ! waitForResponse( readTimeout() ) ) {
      error( ERR_SERVER_TIMEOUT, mHost );
      return false;
    }
    memset( readBuffer, 0, MAX_PACKET_LEN );
    readBufferLen = readLine ( readBuffer, MAX_PACKET_LEN );
    line = readBuffer;
    if ( line == ".\r\n" ) {
      // last article reached
      if ( !entryList.isEmpty() )
        listEntries( entryList );
      return true;
    }

    fields = TQStringList::split( "\t", line, true );
    msgId = TQString::null;
    msgSize = 0;
    TQStringList::ConstIterator it = headers.constBegin();
    TQStringList::ConstIterator it2 = fields.constBegin();
    ++it2; // first entry is the serial number
    for ( ; it != headers.constEnd() && it2 != fields.constEnd(); ++it, ++it2 ) {
      if ( (*it).contains( "Message-ID:", false ) ) {
        msgId = (*it2);
        continue;
      }
      if ( (*it) == "Bytes:" ) {
        msgSize = (*it2).toLong();
        continue;
      }
      atom.m_uds = UDS_EXTRA;
      if ( (*it).endsWith( "full" ) )
        atom.m_str = (*it2).stripWhiteSpace();
      else
        atom.m_str = (*it) + " " + (*it2).stripWhiteSpace();
      entry.append( atom );
    }
    if ( msgId.isEmpty() )
      msgId = fields[0]; // fallback to serial number
    fillUDSEntry( entry, msgId, msgSize, false, true );
    entryList.append( entry );
    if (entryList.count() >= UDS_ENTRY_CHUNK) {
      listEntries(entryList);
      entryList.clear();
    }
  }
  return true;
}


void NNTPProtocol::fillUDSEntry(UDSEntry& entry, const TQString& name, long size,
  bool posting_allowed, bool is_article) {

  long posting=0;

  UDSAtom atom;
  entry.clear();

  // entry name
  atom.m_uds = UDS_NAME;
  atom.m_str = name;
  atom.m_long = 0;
  entry.append(atom);

  // entry size
  atom.m_uds = UDS_SIZE;
  atom.m_str = TQString::null;
  atom.m_long = size;
  entry.append(atom);

  // file type
  atom.m_uds = UDS_FILE_TYPE;
  atom.m_long = is_article? S_IFREG : S_IFDIR;
  atom.m_str = TQString::null;
  entry.append(atom);

  // access permissions
  atom.m_uds = UDS_ACCESS;
  posting = posting_allowed? (S_IWUSR | S_IWGRP | S_IWOTH) : 0;
  atom.m_long = (is_article)? (S_IRUSR | S_IRGRP | S_IROTH) :
    (S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH | posting);
  atom.m_str = TQString::null;
  entry.append(atom);

  atom.m_uds = UDS_USER;
  atom.m_str = mUser.isEmpty() ? TQString("root") : mUser;
  atom.m_long= 0;
  entry.append(atom);

  /*
  atom.m_uds = UDS_GROUP;
  atom.m_str = "root";
  atom.m_long=0;
  entry->append(atom);
  */

  // MIME type
  if (is_article) {
    atom.m_uds = UDS_MIME_TYPE;
    atom.m_long= 0;
    atom.m_str = "message/news";
    entry.append(atom);
  }
}

void NNTPProtocol::nntp_close () {
  if ( isConnectionValid() ) {
    write( "QUIT\r\n", 6 );
    closeDescriptor();
    opened = false;
  }
}

bool NNTPProtocol::nntp_open()
{
  // if still connected reuse connection
  if ( isConnectionValid() ) {
    DBG << "reusing old connection" << endl;
    return true;
  }

  DBG << "  nntp_open -- creating a new connection to " << mHost << ":" << m_iPort << endl;
  // create a new connection
  if ( connectToHost( mHost.latin1(), m_iPort, true ) )
  {
    DBG << "  nntp_open -- connection is open " << endl;

    // read greeting
    int res_code = evalResponse( readBuffer, readBufferLen );

    /* expect one of
         200 server ready - posting allowed
         201 server ready - no posting allowed
    */
    if ( ! ( res_code == 200 || res_code == 201 ) )
    {
      unexpected_response(res_code,"CONNECT");
      return false;
    }

    DBG << "  nntp_open -- greating was read res_code : " << res_code << endl;
    // let local class know that we are connected
    opened = true;

    res_code = sendCommand("MODE READER");

    // TODO: not in RFC 977, so we should not abort here
    if ( !(res_code == 200 || res_code == 201) ) {
      unexpected_response( res_code, "MODE READER" );
      return false;
    }

    // let local class know whether posting is allowed or not
    postingAllowed = (res_code == 200);

    // activate TLS if requested
    if ( metaData("tls") == "on" ) {
      if ( sendCommand( "STARTTLS" ) != 382 ) {
        error( ERR_COULD_NOT_CONNECT, i18n("This server does not support TLS") );
        return false;
      }
      int tlsrc = startTLS();
      if ( tlsrc != 1 ) {
        error( ERR_COULD_NOT_CONNECT, i18n("TLS negotiation failed") );
        return false;
      }
    }

    return true;
  }
  // connection attempt failed
  else
  {
    DBG << "  nntp_open -- connection attempt failed" << endl;
    error( ERR_COULD_NOT_CONNECT, mHost );
    return false;
  }
}

int NNTPProtocol::sendCommand( const TQString &cmd )
{
  int res_code = 0;

  if ( !opened ) {
    ERR << "NOT CONNECTED, cannot send cmd " << cmd << endl;
    return 0;
  }

  DBG << "sending cmd " << cmd << endl;

  write( cmd.latin1(), cmd.length() );
  // check the command for proper termination
  if ( !cmd.endsWith( "\r\n" ) )
    write( "\r\n", 2 );
  res_code =  evalResponse( readBuffer, readBufferLen );

  // if authorization needed send user info
  if (res_code == 480) {
    DBG << "auth needed, sending user info" << endl;

    if ( mUser.isEmpty() || mPass.isEmpty() ) {
      KIO::AuthInfo authInfo;
      authInfo.username = mUser;
      authInfo.password = mPass;
      if ( openPassDlg( authInfo ) ) {
        mUser = authInfo.username;
        mPass = authInfo.password;
      }
    }
    if ( mUser.isEmpty() || mPass.isEmpty() )
      return res_code;

    // send username to server and confirm response
    write( "AUTHINFO USER ", 14 );
    write( mUser.latin1(), mUser.length() );
    write( "\r\n", 2 );
    res_code = evalResponse( readBuffer, readBufferLen );

    if (res_code != 381) {
      // error should be handled by invoking function
      return res_code;
    }

    // send password
    write( "AUTHINFO PASS ", 14 );
    write( mPass.latin1(), mPass.length() );
    write( "\r\n", 2 );
    res_code = evalResponse( readBuffer, readBufferLen );

    if (res_code != 281) {
      // error should be handled by invoking function
      return res_code;
    }

    // ok now, resend command
    write( cmd.latin1(), cmd.length() );
    if ( !cmd.endsWith( "\r\n" ) )
      write( "\r\n", 2 );
    res_code = evalResponse( readBuffer, readBufferLen );
  }

  return res_code;
}

void NNTPProtocol::unexpected_response( int res_code, const TQString & command) {
  ERR << "Unexpected response to " << command << " command: (" << res_code << ") "
      << readBuffer << endl;
  error(ERR_INTERNAL,i18n("Unexpected server response to %1 command:\n%2").
    arg(command).arg(readBuffer));

  // close connection
  nntp_close();
}

int NNTPProtocol::evalResponse ( char *data, ssize_t &len )
{
  if ( !waitForResponse( responseTimeout() ) ) {
    error( ERR_SERVER_TIMEOUT , mHost );
    return -1;
  }
  memset( data, 0, MAX_PACKET_LEN );
  len = readLine( data, MAX_PACKET_LEN );

  if ( len < 3 )
    return -1;

  // get the first three characters. should be the response code
  int respCode = ( ( data[0] - 48 ) * 100 ) + ( ( data[1] - 48 ) * 10 ) + ( ( data[2] - 48 ) );

  DBG << "evalResponse - got: " << respCode << endl;

  return respCode;
}

/* not really necessary, because the slave has to
   use the KIO::Error's instead, but let this here for
   documentation of the NNTP response codes and may
   by later use.
TQString& NNTPProtocol::errorStr(int resp_code) {
  TQString ret;

  switch (resp_code) {
  case 100: ret = "help text follows"; break;
  case 199: ret = "debug output"; break;

  case 200: ret = "server ready - posting allowed"; break;
  case 201: ret = "server ready - no posting allowed"; break;
  case 202: ret = "slave status noted"; break;
  case 205: ret = "closing connection - goodbye!"; break;
  case 211: ret = "group selected"; break;
  case 215: ret = "list of newsgroups follows"; break;
  case 220: ret = "article retrieved - head and body follow"; break;
  case 221: ret = "article retrieved - head follows"; break;
  case 222: ret = "article retrieved - body follows"; break;
  case 223: ret = "article retrieved - request text separately"; break;
  case 230: ret = "list of new articles by message-id follows"; break;
  case 231: ret = "list of new newsgroups follows"; break;
  case 235: ret = "article transferred ok"; break;
  case 240: ret = "article posted ok"; break;

  case 335: ret = "send article to be transferred"; break;
  case 340: ret = "send article to be posted"; break;

  case 400: ret = "service discontinued"; break;
  case 411: ret = "no such news group"; break;
  case 412: ret = "no newsgroup has been selected"; break;
  case 420: ret = "no current article has been selected"; break;
  case 421: ret = "no next article in this group"; break;
  case 422: ret = "no previous article in this group"; break;
  case 423: ret = "no such article number in this group"; break;
  case 430: ret = "no such article found"; break;
  case 435: ret = "article not wanted - do not send it"; break;
  case 436: ret = "transfer failed - try again later"; break;
  case 437: ret = "article rejected - do not try again"; break;
  case 440: ret = "posting not allowed"; break;
  case 441: ret = "posting failed"; break;

  case 500: ret = "command not recognized"; break;
  case 501: ret = "command syntax error"; break;
  case 502: ret = "access restriction or permission denied"; break;
  case 503: ret = "program fault - command not performed"; break;
  default:  ret = TQString("unknown NNTP response code %1").arg(resp_code);
  }

  return ret;
}
*/