summaryrefslogtreecommitdiffstats
path: root/src/ftp-ls.c
blob: 7a18584ffcd2b83829fe19071248f55739fb28fc (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
/* Parsing FTP `ls' output.
   Copyright (C) 1996-2011, 2015, 2018-2024 Free Software Foundation,
   Inc.

This file is part of GNU Wget.

GNU Wget is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

GNU Wget is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Wget.  If not, see <http://www.gnu.org/licenses/>.

Additional permission under GNU GPL version 3 section 7

If you modify this program, or any covered work, by linking or
combining it with the OpenSSL project's OpenSSL library (or a
modified version of that library), containing parts covered by the
terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
grants you additional permission to convey the resulting work.
Corresponding Source for a non-source form of such a combination
shall include the source code for the parts of OpenSSL used as well
as that of the covered work.  */

#include "wget.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include "utils.h"
#include "ftp.h"
#include "url.h"
#include "convert.h"            /* for html_quote_string prototype */
#include "retr.h"               /* for output_stream */
#include "c-strcase.h"

/* Converts symbolic permissions to number-style ones, e.g. string
   rwxr-xr-x to 755.  For now, it knows nothing of
   setuid/setgid/sticky.  ACLs are ignored.  */
static int
symperms (const char *s)
{
  int perms = 0, i;

  if (strlen (s) < 9)
    return 0;
  for (i = 0; i < 3; i++, s += 3)
    {
      perms <<= 3;
      perms += (((s[0] == 'r') << 2) + ((s[1] == 'w') << 1) +
                (s[2] == 'x' || s[2] == 's'));
    }
  return perms;
}


/* Cleans a line of text so that it can be consistently parsed. Destroys
   <CR> and <LF> in case that they occur at the end of the line and
   replaces all <TAB> character with <SPACE>. Returns the length of the
   modified line. */
static int
clean_line (char *line, int len)
{
  if (len <= 0) return 0;

  while (len > 0 && (line[len - 1] == '\n' || line[len - 1] == '\r'))
    line[--len] = '\0';

  if (!len) return 0;

  for ( ; *line ; line++ ) if (*line == '\t') *line = ' ';

  return len;
}

/* Convert the Un*x-ish style directory listing stored in FILE to a
   linked list of fileinfo (system-independent) entries.  The contents
   of FILE are considered to be produced by the standard Unix `ls -la'
   output (whatever that might be).  BSD (no group) and SYSV (with
   group) listings are handled.

   The timestamps are stored in a separate variable, time_t
   compatible (I hope).  The timezones are ignored.  */
static struct fileinfo *
ftp_parse_unix_ls (FILE *fp, int ignore_perms)
{
  static const char *months[] = {
    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  };
  int next, len, i, error, ignore;
  int year, month, day;         /* for time analysis */
  int hour, min, sec, ptype;
  struct tm timestruct, *tnow;
  time_t timenow;
  size_t bufsize = 0;

  char *line = NULL, *tok, *ptok;      /* tokenizer */
  struct fileinfo *dir, *l, cur;       /* list creation */

  dir = l = NULL;

  /* Line loop to end of file: */
  while ((len = getline (&line, &bufsize, fp)) > 0)
    {
      len = clean_line (line, len);
      /* Skip if total...  */
      if (!c_strncasecmp (line, "total", 5))
        continue;
      /* Get the first token (permissions).  */
      tok = strtok (line, " ");
      if (!tok)
        continue;

      cur.name = NULL;
      cur.linkto = NULL;

      /* Decide whether we deal with a file or a directory.  */
      switch (*tok)
        {
        case '-':
          cur.type = FT_PLAINFILE;
          DEBUGP (("PLAINFILE; "));
          break;
        case 'd':
          cur.type = FT_DIRECTORY;
          DEBUGP (("DIRECTORY; "));
          break;
        case 'l':
          cur.type = FT_SYMLINK;
          DEBUGP (("SYMLINK; "));
          break;
        default:
          cur.type = FT_UNKNOWN;
          DEBUGP (("UNKNOWN; "));
          break;
        }

      if (ignore_perms)
        {
          switch (cur.type)
            {
            case FT_PLAINFILE:
              cur.perms = 0644;
              break;
            case FT_DIRECTORY:
              cur.perms = 0755;
              break;
            default:
              /*cur.perms = 1023;*/     /* #### What is this?  --hniksic */
              cur.perms = 0644;
            }
          DEBUGP (("implicit perms %0o; ", (unsigned) cur.perms));
        }
       else
         {
           cur.perms = symperms (tok + 1);
           DEBUGP (("perms %0o; ", (unsigned) cur.perms));
         }

      error = ignore = 0;       /* Erroneous and ignoring entries are
                                   treated equally for now.  */
      year = hour = min = sec = 0; /* Silence the compiler.  */
      month = day = 0;
      ptype = TT_DAY;
      next = -1;
      /* While there are tokens on the line, parse them.  Next is the
         number of tokens left until the filename.

         Use the month-name token as the "anchor" (the place where the
         position wrt the file name is "known").  When a month name is
         encountered, `next' is set to 5.  Also, the preceding
         characters are parsed to get the file size.

         This tactic is quite dubious when it comes to
         internationalization issues (non-English month names), but it
         works for now.  */
      tok = line;
      while (ptok = tok,
             (tok = strtok (NULL, " ")) != NULL)
        {
          --next;
          if (next < 0)         /* a month name was not encountered */
            {
              for (i = 0; i < 12; i++)
                if (!c_strcasecmp (tok, months[i]))
                  break;
              /* If we got a month, it means the token before it is the
                 size, and the filename is three tokens away.  */
              if (i != 12)
                {
                  wgint size;

                  /* Parse the previous token with str_to_wgint.  */
                  if (ptok == line)
                    {
                      /* Something has gone wrong during parsing. */
                      error = 1;
                      break;
                    }
                  errno = 0;
                  size = str_to_wgint (ptok, NULL, 10);
                  if (size == WGINT_MAX && errno == ERANGE)
                    /* Out of range -- ignore the size.  #### Should
                       we refuse to start the download.  */
                    cur.size = 0;
                  else
                    cur.size = size;
                  DEBUGP (("size: %s; ", number_to_static_string(cur.size)));

                  month = i;
                  next = 5;
                  DEBUGP (("month: %s; ", months[month]));
                }
            }
          else if (next == 4)   /* days */
            {
              if (tok[1])       /* two-digit... */
                day = 10 * (*tok - '0') + tok[1] - '0';
              else              /* ...or one-digit */
                day = *tok - '0';
              DEBUGP (("day: %d; ", day));
            }
          else if (next == 3)
            {
              /* This ought to be either the time, or the year.  Let's
                 be flexible!

                 If we have a number x, it's a year.  If we have x:y,
                 it's hours and minutes.  If we have x:y:z, z are
                 seconds.  */
              year = 0;
              min = hour = sec = 0;
              /* We must deal with digits.  */
              if (c_isdigit (*tok))
                {
                  /* Suppose it's year.  Limit to year 99999 to avoid integer overflow. */
                  for (; c_isdigit (*tok) && year <= 99999; tok++)
                    year = (*tok - '0') + 10 * year;
                  if (*tok == ':')
                    {
                      int n;
                      /* This means these were hours!  */
                      hour = year;
                      year = 0;
                      ptype = TT_HOUR_MIN;
                      ++tok;
                      /* Get the minutes...  */
                      for (n = 0; c_isdigit (*tok) && n < 2; tok++, n++)
                        min = (*tok - '0') + 10 * min;
                      if (*tok == ':')
                        {
                          /* ...and the seconds.  */
                          ++tok;
                          for (n = 0; c_isdigit (*tok) && n < 2; tok++, n++)
                            sec = (*tok - '0') + 10 * sec;
                        }
                    }
                }
              if (year)
                DEBUGP (("year: %d (no tm); ", year));
              else
                DEBUGP (("time: %02d:%02d:%02d (no yr); ", hour, min, sec));
            }
          else if (next == 2)    /* The file name */
            {
              int fnlen;
              char *p;

              /* Since the file name may contain a SPC, it is possible
                 for strtok to handle it wrong.  */
              fnlen = strlen (tok);
              if (fnlen < len - (tok - line))
                {
                  /* So we have a SPC in the file name.  Restore the
                     original.  */
                  tok[fnlen] = ' ';
                  /* If the file is a symbolic link, it should have a
                     ` -> ' somewhere.  */
                  if (cur.type == FT_SYMLINK)
                    {
                      p = strstr (tok, " -> ");
                      if (!p)
                        {
                          error = 1;
                          break;
                        }
                      cur.linkto = xstrdup (p + 4);
                      DEBUGP (("link to: %s\n", cur.linkto));
                      /* And separate it from the file name.  */
                      *p = '\0';
                    }
                }
              /* If we have the filename, add it to the list of files or
                 directories.  */
              /* "." and ".." are an exception!  */
              if (!strcmp (tok, ".") || !strcmp (tok, ".."))
                {
                  DEBUGP (("\nIgnoring `.' and `..'; "));
                  ignore = 1;
                  break;
                }
              /* Some FTP sites choose to have ls -F as their default
                 LIST output, which marks the symlinks with a trailing
                 `@', directory names with a trailing `/' and
                 executables with a trailing `*'.  This is no problem
                 unless encountering a symbolic link ending with `@',
                 or an executable ending with `*' on a server without
                 default -F output.  I believe these cases are very
                 rare.  */
              fnlen = strlen (tok); /* re-calculate `fnlen' */
              cur.name = xmalloc (fnlen + 1);
              memcpy (cur.name, tok, fnlen + 1);
              if (fnlen)
                {
                  if (cur.type == FT_DIRECTORY && cur.name[fnlen - 1] == '/')
                    {
                      cur.name[fnlen - 1] = '\0';
                      DEBUGP (("trailing `/' on dir.\n"));
                    }
                  else if (cur.type == FT_SYMLINK && cur.name[fnlen - 1] == '@')
                    {
                      cur.name[fnlen - 1] = '\0';
                      DEBUGP (("trailing `@' on link.\n"));
                    }
                  else if (cur.type == FT_PLAINFILE
                           && (cur.perms & 0111)
                           && cur.name[fnlen - 1] == '*')
                    {
                      cur.name[fnlen - 1] = '\0';
                      DEBUGP (("trailing `*' on exec.\n"));
                    }
                } /* if (fnlen) */
              else
                error = 1;
              break;
            }
          else
            abort ();
        } /* while */

      if (!cur.name || (cur.type == FT_SYMLINK && !cur.linkto))
        error = 1;

      DEBUGP (("%s\n", cur.name ? cur.name : ""));

      if (error || ignore)
        {
          DEBUGP (("Skipping.\n"));
          xfree (cur.name);
          xfree (cur.linkto);
          continue;
        }

      if (!dir)
        {
          l = dir = xnew (struct fileinfo);
          memcpy (l, &cur, sizeof (cur));
          l->prev = l->next = NULL;
        }
      else
        {
          cur.prev = l;
          l->next = xnew (struct fileinfo);
          l = l->next;
          memcpy (l, &cur, sizeof (cur));
          l->next = NULL;
        }
      /* Get the current time.  */
      timenow = time (NULL);
      tnow = localtime (&timenow);
      /* Build the time-stamp (the idea by zaga@fly.cc.fer.hr).  */
      timestruct.tm_sec   = sec;
      timestruct.tm_min   = min;
      timestruct.tm_hour  = hour;
      timestruct.tm_mday  = day;
      timestruct.tm_mon   = month;
      if (year == 0)
        {
          /* Some listings will not specify the year if it is "obvious"
             that the file was from the previous year.  E.g. if today
             is 97-01-12, and you see a file of Dec 15th, its year is
             1996, not 1997.  Thanks to Vladimir Volovich for
             mentioning this!  */
          if (month > tnow->tm_mon)
            timestruct.tm_year = tnow->tm_year - 1;
          else
            timestruct.tm_year = tnow->tm_year;
        }
      else
        timestruct.tm_year = year;
      if (timestruct.tm_year >= 1900)
        timestruct.tm_year -= 1900;
      timestruct.tm_wday  = 0;
      timestruct.tm_yday  = 0;
      timestruct.tm_isdst = -1;
      l->tstamp = mktime (&timestruct); /* store the time-stamp */
      l->ptype = ptype;
    }

  xfree (line);
  return dir;
}

static struct fileinfo *
ftp_parse_winnt_ls (FILE *fp)
{
  int len;
  int year, month, day;         /* for time analysis */
  int hour, min;
  size_t bufsize = 0;
  struct tm timestruct;

  char *line = NULL, *tok;             /* tokenizer */
  char *filename;
  struct fileinfo *dir, *l, cur; /* list creation */

  dir = l = NULL;
  cur.name = NULL;

  /* Line loop to end of file: */
  while ((len = getline (&line, &bufsize, fp)) > 0)
    {
      len = clean_line (line, len);

      /* Name begins at 39 column of the listing if date presented in `mm-dd-yy'
         format or at 41 column if date presented in `mm-dd-yyyy' format. Thus,
         we cannot extract name before we parse date. Using this information we
         also can recognize filenames that begin with a series of space
         characters (but who really wants to use such filenames anyway?). */
      if (len < 40) continue;
      filename = line + 39;

      /* First column: mm-dd-yy or mm-dd-yyyy. Should atoi() on the month fail,
         january will be assumed.  */
      tok = strtok(line, "-");
      if (tok == NULL) continue;
      month = atoi(tok);
      if (month < 0) month = 0; else month--;
      tok = strtok(NULL, "-");
      if (tok == NULL) continue;
      day = atoi(tok);
      tok = strtok(NULL, " ");
      if (tok == NULL) continue;
      year = atoi(tok);
      /* Assuming the epoch starting at 1.1.1970 */
      if (year <= 70)
        {
          year += 100;
        }
      else if (year >= 1900)
        {
          year -= 1900;
          if (len < 42) continue;
          filename += 2;
        }
      /* Now it is possible to determine the position of the first symbol in
         filename. */
      xfree (cur.name);
      memset(&cur, 0, sizeof (cur));
      cur.name = xstrdup(filename);
      DEBUGP (("Name: '%s'\n", cur.name));


      /* Second column: hh:mm[AP]M, listing does not contain value for
         seconds */
      tok = strtok(NULL,  ":");
      if (tok == NULL) continue;
      hour = atoi(tok);
      tok = strtok(NULL,  "M");
      if (tok == NULL) continue;
      min = atoi(tok);
      /* Adjust hour from AM/PM. Just for the record, the sequence goes
         11:00AM, 12:00PM, 01:00PM ... 11:00PM, 12:00AM, 01:00AM . */
      if (tok[0] && tok[1]) tok+=2;
      if (hour >= 12 || hour < 0)  hour  = 0;
      if (*tok == 'P') hour += 12;

      DEBUGP (("YYYY/MM/DD HH:MM - %d/%02d/%02d %02d:%02d\n",
              year+1900, month, day, hour, min));

      /* Build the time-stamp (copy & paste from above) */
      timestruct.tm_sec   = 0;
      timestruct.tm_min   = min;
      timestruct.tm_hour  = hour;
      timestruct.tm_mday  = day;
      timestruct.tm_mon   = month;
      timestruct.tm_year  = year;
      timestruct.tm_wday  = 0;
      timestruct.tm_yday  = 0;
      timestruct.tm_isdst = -1;
      cur.tstamp = mktime (&timestruct); /* store the time-stamp */
      cur.ptype = TT_HOUR_MIN;

      DEBUGP (("Timestamp: %ld\n", cur.tstamp));

      /* Third column: Either file length, or <DIR>. We also set the
         permissions (guessed as 0644 for plain files and 0755 for
         directories as the listing does not give us a clue) and filetype
         here. */
      tok = strtok(NULL, " ");
      if (tok == NULL) continue;
      while ((tok != NULL) && (*tok == '\0'))  tok = strtok(NULL, " ");
      if (tok == NULL) continue;
      if (*tok == '<')
        {
          cur.type  = FT_DIRECTORY;
          cur.size  = 0;
          cur.perms = 0755;
          DEBUGP (("Directory\n"));
        }
      else
        {
          wgint size;
          cur.type  = FT_PLAINFILE;
          errno = 0;
          size = str_to_wgint (tok, NULL, 10);
          if (size == WGINT_MAX && errno == ERANGE)
            cur.size = 0;       /* overflow */
          else
            cur.size = size;
          cur.perms = 0644;
          DEBUGP (("File, size %s bytes\n", number_to_static_string (cur.size)));
        }

      cur.linkto = NULL;

      /* And put everything into the linked list */
      if (!dir)
        {
          l = dir = xnew (struct fileinfo);
          memcpy (l, &cur, sizeof (cur));
          l->prev = l->next = NULL;
        }
      else
        {
          cur.prev = l;
          l->next = xnew (struct fileinfo);
          l = l->next;
          memcpy (l, &cur, sizeof (cur));
          l->next = NULL;
        }
      cur.name = NULL;
    }

  xfree (cur.name);
  xfree (line);
  return dir;
}



/* Convert the VMS-style directory listing stored in "file" to a
   linked list of fileinfo (system-independent) entries.  The contents
   of FILE are considered to be produced by the standard VMS
   "DIRECTORY [/SIZE [= ALL]] /DATE [/OWNER] [/PROTECTION]" command,
   more or less.  (Different VMS FTP servers may have different headers,
   and may not supply the same data, but all should be subsets of this.)

   VMS normally provides local (server) time and date information.
   Define the logical name or environment variable
   "WGET_TIMEZONE_DIFFERENTIAL" (seconds) to adjust the receiving local
   times if different from the remote local times.

   2005-02-23 SMS.
   Added code to eliminate "^" escape characters from ODS5 extended file
   names.  The TCPIP FTP server (V5.4) seems to prefer requests which do
   not use the escaped names which it provides.
*/

#define VMS_DEFAULT_PROT_FILE 0644
#define VMS_DEFAULT_PROT_DIR 0755

/* 2005-02-23 SMS.
   eat_carets().

   Delete ODS5 extended file name escape characters ("^") in the
   original buffer.
   Note that the current scheme does not handle all EFN cases, but it
   could be made more complicated.
*/

static void eat_carets( char *str)
/* char *str;      Source pointer. */
{
  char *strd;   /* Destination pointer. */
  char hdgt;
  unsigned char uchr;

  /* Skip ahead to the first "^", if any. */
  while ((*str != '\0') && (*str != '^'))
     str++;

  /* If no caret was found, quit early. */
  if (*str != '\0')
  {
    /* Shift characters leftward as carets are found. */
    strd = str;
    while (*str != '\0')
    {
      uchr = *str;
      if (uchr == '^')
      {
        /* Found a caret.  Skip it, and check the next character. */
        if ((char_prop[(unsigned char) str[1]] & 64) && (char_prop[(unsigned char) str[2]] & 64))
        {
          /* Hex digit.  Get char code from this and next hex digit. */
          uchr = *(++str);
          if (uchr <= '9')
          {
            hdgt = uchr - '0';           /* '0' - '9' -> 0 - 9. */
          }
          else
          {
            hdgt = ((uchr - 'A') & 7) + 10;    /* [Aa] - [Ff] -> 10 - 15. */
          }
          hdgt <<= 4;                   /* X16. */
          uchr = *(++str);              /* Next char must be hex digit. */
          if (uchr <= '9')
          {
            uchr = hdgt + uchr - '0';
          }
          else
          {
            uchr = hdgt + ((uchr - 'A') & 15) + 10;
          }
        }
        else if (uchr == '_')
        {
          /* Convert escaped "_" to " ". */
          uchr = ' ';
        }
        else if (uchr == '/')
        {
          /* Convert escaped "/" (invalid Zip) to "?" (invalid VMS). */
          /* Note that this is a left-over from Info-ZIP code, and is
             probably of little value here, except perhaps to avoid
             directory confusion which an unconverted slash might cause.
          */
          uchr = '?';
        }
        /* Else, not a hex digit.  Must be a simple escaped character
           (or Unicode, which is not yet handled here).
        */
      }
      /* Else, not a caret.  Use as-is. */
      *strd = uchr;

      /* Advance destination and source pointers. */
      strd++;
      str++;
    }
    /* Terminate the destination string. */
    *strd = '\0';
  }
}


static struct fileinfo *
ftp_parse_vms_ls (FILE *fp)
{
  int dt, i, j, len;
  int perms;
  size_t bufsize = 0;
  time_t timenow;
  struct tm *timestruct;
  char date_str[32];

  char *line = NULL, *tok; /* tokenizer */
  struct fileinfo *dir, *l, cur; /* list creation */

  dir = l = NULL;

  /* Skip blank lines, Directory heading, and more blank lines. */

  for (j = 0; (i = getline (&line, &bufsize, fp)) > 0; )
    {
      i = clean_line (line, i);
      if (i <= 0)
        continue; /* Ignore blank line. */

      if ((j == 0) && (line[i - 1] == ']'))
        {
          /* Found Directory heading line.  Next non-blank line
          is significant. */
          j = 1;
        }
      else if (!strncmp (line, "Total of ", 9))
        {
          /* Found "Total of ..." footing line.  No valid data
             will follow (empty directory). */
          i = 0; /* Arrange for early exit. */
          break;
        }
      else
        {
          break; /* Must be significant data. */
        }
    }

  /* Read remainder of file until the next blank line or EOF. */

  cur.name = NULL;
  while (i > 0)
    {
      char *p;

      /* The first token is the file name.  After a long name, other
         data may be on the following line.  A valid directory name ends
         in ".DIR;1" (any case), although some VMS FTP servers may omit
         the version number (";1").
      */

      tok = strtok(line, " ");
      if (tok == NULL) tok = line;
      DEBUGP (("file name:   '%s'\n", tok));

      /* Stripping the version number on a VMS system would be wrong.
         It may be foolish on a non-VMS system, too, but that's someone
         else's problem.  (Define PRESERVE_VMS_VERSIONS for proper
         operation on other operating systems.)

         2005-02-23 SMS.
         ODS5 extended file names may contain escaped semi-colons, so
         the version number is identified as right-side decimal digits
         led by a non-escaped semi-colon.  It may be absent.
      */

#if (!defined( __VMS) && !defined( PRESERVE_VMS_VERSIONS))
      for (p = tok + strlen (tok); (--p > tok) && c_isdigit(*p); );
      if (p > tok && (*p == ';') && (*(p - 1) != '^'))
        {
          *p = '\0';
        }
#endif /* (!defined( __VMS) && !defined( PRESERVE_VMS_VERSIONS)) */

      /* 2005-02-23 SMS.
         Eliminate "^" escape characters from ODS5 extended file name.
         (A caret is invalid in an ODS2 name, so this is always safe.)
      */
      eat_carets (tok);
      DEBUGP (("file name-^: '%s'\n", tok));

      /* Differentiate between a directory and any other file.  A VMS
         listing may not include file protections (permissions).  Set a
         default permissions value (according to the file type), which
         may be overwritten later.  Store directory names without the
         ".DIR;1" file type and version number, as the plain name is
         what will work in a CWD command.
      */
      len = strlen (tok);
      if (len >= 4 && !c_strncasecmp(tok + (len - 4), ".DIR", 4))
        {
          *(tok + (len - 4)) = '\0'; /* Discard ".DIR". */
          cur.type  = FT_DIRECTORY;
          cur.perms = VMS_DEFAULT_PROT_DIR;
          DEBUGP (("Directory (nv)\n"));
        }
      else if (len >= 6 && !c_strncasecmp (tok + len - 6, ".DIR;1", 6))
        {
          *(tok + (len - 6)) = '\0'; /* Discard ".DIR;1". */
          cur.type  = FT_DIRECTORY;
          cur.perms = VMS_DEFAULT_PROT_DIR;
          DEBUGP (("Directory (v)\n"));
        }
      else
        {
          cur.type  = FT_PLAINFILE;
          cur.perms = VMS_DEFAULT_PROT_FILE;
          DEBUGP (("File\n"));
        }
      xfree (cur.name);
      cur.name = xstrdup (tok);
      DEBUGP (("Name: '%s'\n", cur.name));

      /* Null the date and time string. */
      *date_str = '\0';

      /* VMS lacks symbolic links. */
      cur.linkto = NULL;

      /* VMS reports file sizes in (512-byte) disk blocks, not bytes,
         hence useless for an integrity check based on byte-count.
         Set size to unknown.
      */
      cur.size = 0;

      /* Get token 2, if any.  A long name may force all other data onto
         a second line.  If needed, read the second line.
      */

      tok = strtok (NULL, " ");
      if (tok == NULL)
        {
          DEBUGP (("Getting additional line.\n"));
          i = getline (&line, &bufsize, fp);
          if (i <= 0)
            {
              DEBUGP (("EOF.  Leaving listing parser.\n"));
              break;
            }

          /* Second line must begin with " ".  Otherwise, it's a first
             line (and we may be confused).
          */
          i = clean_line (line, i);
          if (i <= 0)
            {
              /* Blank line.  End of significant file listing. */
              DEBUGP (("Blank line.  Leaving listing parser.\n"));
              break;
            }
          else if (line[0] != ' ')
            {
              DEBUGP (("Non-blank in column 1.  Must be a new file name?\n"));
              continue;
            }
          else
            {
              tok = strtok (line, " ");
              if (tok == NULL)
                {
                  /* Unexpected non-empty but apparently blank line. */
                  DEBUGP (("Null token.  Leaving listing parser.\n"));
                  break;
                }
            }
        }

      /* Analyze tokens.  (Order is not significant, except date must
         precede time.)

         Size:       ddd or ddd/ddd (where "ddd" is a decimal number)
         Date:       DD-MMM-YYYY
         Time:       HH:MM or HH:MM:SS or HH:MM:SS.CC
         Owner:      [user] or [user,group]
         Protection: (ppp,ppp,ppp,ppp) (where "ppp" is "RWED" or some
         subset thereof, for System, Owner, Group, World.

         If permission is lacking, info may be replaced by the string:
         "No privilege for attempted operation".
      */
      while (tok != NULL)
        {
          DEBUGP (("Token: >%s<: ", tok));

          if ((strlen (tok) < 12) && (strchr( tok, '-') != NULL))
            {
              /* Date. */
              DEBUGP (("Date.\n"));
				  snprintf(date_str, sizeof(date_str), "%s ", tok);
            }
          else if ((strlen (tok) < 12) && (strchr( tok, ':') != NULL))
            {
              /* Time. */
              DEBUGP (("Time. "));
              strncat( date_str,
                       tok,
                       (sizeof( date_str)- strlen (date_str) - 1));
              DEBUGP (("Date time: >%s<\n", date_str));
            }
          else if (strchr (tok, '[') != NULL)
            {
              /* Owner.  (Ignore.) */
              DEBUGP (("Owner.\n"));
            }
          else if (strchr (tok, '(') != NULL)
            {
              /* Protections (permissions). */
              perms = 0;
              j = 0;
              /*FIXME: Should not be using the variable like this. */
              for (i = 0; i < (int) strlen(tok); i++)
                {
                  switch (tok[ i])
                    {
                    case '(':
                      break;
                    case ')':
                      break;
                    case ',':
                      if (j == 0)
                        {
                          perms = 0;
                        }
                      else if (j < 4)
                        {
                          perms <<= 3;
                        }
                      j++;
                      break;
                    case 'R':
                      perms |= 4;
                      break;
                    case 'W':
                      perms |= 2;
                      break;
                    case 'E':
                      perms |= 1;
                      break;
                    case 'D':
                      perms |= 2;
                      break;
                    }
                }
              cur.perms = perms;
              DEBUGP (("Prot.  perms = %0o.\n", (unsigned) cur.perms));
            }
          else
            {
              /* Nondescript.  Probably size(s), probably in blocks.
                 Could be "No privilege ..." message.  (Ignore.)
              */
              DEBUGP (("Ignored (size?).\n"));
            }

          tok = strtok (NULL, " ");
        }

      /* Tokens exhausted.  Interpret the data, and fill in the
         structure.
      */
      /* Fill tm timestruct according to date-time string.  Fractional
         seconds are ignored.  Default to current time, if conversion
         fails.
      */
      timenow = time( NULL);
      timestruct = localtime( &timenow );
      strptime( date_str, "%d-%b-%Y %H:%M:%S", timestruct);

      /* Convert struct tm local time to time_t local time. */
      timenow = mktime (timestruct);
      /* Offset local time according to environment variable (seconds). */
      if ((tok = getenv ( "WGET_TIMEZONE_DIFFERENTIAL")) != NULL)
        {
          dt = atoi (tok);
          DEBUGP (("Time differential = %d.\n", dt));
        }
      else
        dt = 0;

      if (dt >= 0)
        timenow += dt;
      else
        timenow -= (-dt);

      cur.tstamp = timenow; /* Store the time-stamp. */
      DEBUGP (("Timestamp: %ld\n", cur.tstamp));
      cur.ptype = TT_HOUR_MIN;

      /* Add the data for this item to the linked list, */
      if (!dir)
        {
          l = dir = xmalloc (sizeof (struct fileinfo));
          cur.prev = cur.next = NULL;
          memcpy (l, &cur, sizeof (cur));
        }
      else
        {
          cur.prev = l;
			 cur.next = NULL;
          l->next = xmalloc (sizeof (struct fileinfo));
          l = l->next;
          memcpy (l, &cur, sizeof (cur));
        }
      cur.name = NULL;

      i = getline (&line, &bufsize, fp);
      if (i > 0)
        {
          i = clean_line (line, i);
          if (i <= 0)
            {
              /* Blank line.  End of significant file listing. */
              break;
            }
        }
    }

  xfree (cur.name);
  xfree (line);
  return dir;
}


/* This function switches between the correct parsing routine depending on
   the SYSTEM_TYPE. The system type should be based on the result of the
   "SYST" response of the FTP server. According to this response we will
   use on of the three different listing parsers that cover the most of FTP
   servers used nowadays.  */

struct fileinfo *
ftp_parse_ls (const char *file, const enum stype system_type)
{
  FILE *fp;
  struct fileinfo *fi;

  fp = fopen (file, "rb");
  if (!fp)
    {
      logprintf (LOG_NOTQUIET, "%s: %s\n", file, strerror (errno));
      return NULL;
    }

  fi = ftp_parse_ls_fp (fp, system_type);
  fclose(fp);

  return fi;
}

struct fileinfo *
ftp_parse_ls_fp (FILE *fp, const enum stype system_type)
{
  switch (system_type)
    {
    case ST_UNIX:
      return ftp_parse_unix_ls (fp, 0);
    case ST_WINNT:
      {
        /* Detect whether the listing is simulating the UNIX format */
        int   c = fgetc(fp);
        rewind(fp);

        /* If the first character of the file is '0'-'9', it's WINNT
           format. */
        if (c >= '0' && c <='9')
          return ftp_parse_winnt_ls (fp);
        else
          return ftp_parse_unix_ls (fp, 1);
      }
    case ST_VMS:
      return ftp_parse_vms_ls (fp);
    case ST_MACOS:
      return ftp_parse_unix_ls (fp, 1);
    default:
      logprintf (LOG_NOTQUIET, _("\
Unsupported listing type, trying Unix listing parser.\n"));
      return ftp_parse_unix_ls (fp, 0);
    }
}

/* Stuff for creating FTP index. */

/* The function creates an HTML index containing references to given
   directories and files on the appropriate host.  The references are
   FTP.  */
uerr_t
ftp_index (const char *file, struct url *u, struct fileinfo *f)
{
  FILE *fp;
  char *upwd;
  char *htcldir;                /* HTML-clean dir name */
  char *htclfile;               /* HTML-clean file name */
  char *urlclfile;              /* URL-clean file name */

  if (!output_stream)
    {
      fp = fopen (file, "wb");
      if (!fp)
        {
          logprintf (LOG_NOTQUIET, "%s: %s\n", file, strerror (errno));
          return FOPENERR;
        }
    }
  else
    fp = output_stream;
  if (u->user)
    {
      char *tmpu, *tmpp;        /* temporary, clean user and passwd */

      tmpu = url_escape (u->user);
      tmpp = u->passwd ? url_escape (u->passwd) : NULL;
      if (tmpp)
        upwd = concat_strings (tmpu, ":", tmpp, "@", (char *) 0);
      else
        upwd = concat_strings (tmpu, "@", (char *) 0);
      xfree (tmpu);
      xfree (tmpp);
    }
  else
    upwd = xstrdup ("");

  htcldir = html_quote_string (u->dir);

  fprintf (fp, "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n");
  fprintf (fp, "<html>\n<head>\n<title>");
  fprintf (fp, _("Index of /%s on %s:%d"), htcldir, u->host, u->port);
  fprintf (fp, "</title>\n</head>\n<body>\n<h1>");
  fprintf (fp, _("Index of /%s on %s:%d"), htcldir, u->host, u->port);
  fprintf (fp, "</h1>\n<hr>\n<pre>\n");

  while (f)
    {
      fprintf (fp, "  ");
      if (f->tstamp != -1)
        {
          /* #### Should we translate the months?  Or, even better, use
             ISO 8601 dates?  */
          static const char *months[] = {
            "Jan", "Feb", "Mar", "Apr", "May", "Jun",
            "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
          };
          time_t tstamp = f->tstamp;
          struct tm *ptm = localtime (&tstamp);

          fprintf (fp, "%d %s %02d ", ptm->tm_year + 1900, months[ptm->tm_mon],
                  ptm->tm_mday);
          if (f->ptype == TT_HOUR_MIN)
            fprintf (fp, "%02d:%02d  ", ptm->tm_hour, ptm->tm_min);
          else
            fprintf (fp, "       ");
        }
      else
        fprintf (fp, _("time unknown       "));
      switch (f->type)
        {
        case FT_PLAINFILE:
          fprintf (fp, _("File        "));
          break;
        case FT_DIRECTORY:
          fprintf (fp, _("Directory   "));
          break;
        case FT_SYMLINK:
          fprintf (fp, _("Link        "));
          break;
        default:
          fprintf (fp, _("Not sure    "));
          break;
        }
      htclfile = html_quote_string (f->name);
      urlclfile = url_escape_unsafe_and_reserved (f->name);
      fprintf (fp, "<a href=\"ftp://%s%s:%d", upwd, u->host, u->port);
      if (*u->dir != '/')
        putc ('/', fp);
      /* XXX: Should probably URL-escape dir components here, rather
       * than just HTML-escape, for consistency with the next bit where
       * we use urlclfile for the file component. Anyway, this is safer
       * than what we had... */
      fprintf (fp, "%s", htcldir);
      if (*u->dir)
        putc ('/', fp);
      fprintf (fp, "%s", urlclfile);
      if (f->type == FT_DIRECTORY)
        putc ('/', fp);
      fprintf (fp, "\">%s", htclfile);
      if (f->type == FT_DIRECTORY)
        putc ('/', fp);
      fprintf (fp, "</a> ");
      if (f->type == FT_PLAINFILE)
        fprintf (fp, _(" (%s bytes)"), number_to_static_string (f->size));
      else if (f->type == FT_SYMLINK)
        fprintf (fp, "-> %s", f->linkto ? f->linkto : "(nil)");
      putc ('\n', fp);
      xfree (htclfile);
      xfree (urlclfile);
      f = f->next;
    }
  fprintf (fp, "</pre>\n</body>\n</html>\n");
  xfree (htcldir);
  xfree (upwd);
  if (!output_stream)
    fclose (fp);
  else
    fflush (fp);
  return FTPOK;
}