chiark / gitweb /
util: replace close_nointr_nofail() by a more useful safe_close()
[elogind.git] / src / journal / sd-journal.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /***
4   This file is part of systemd.
5
6   Copyright 2011 Lennart Poettering
7
8   systemd is free software; you can redistribute it and/or modify it
9   under the terms of the GNU Lesser General Public License as published by
10   the Free Software Foundation; either version 2.1 of the License, or
11   (at your option) any later version.
12
13   systemd is distributed in the hope that it will be useful, but
14   WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16   Lesser General Public License for more details.
17
18   You should have received a copy of the GNU Lesser General Public License
19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 ***/
21
22 #include <errno.h>
23 #include <fcntl.h>
24 #include <stddef.h>
25 #include <unistd.h>
26 #include <sys/inotify.h>
27 #include <sys/poll.h>
28 #include <sys/vfs.h>
29 #include <linux/magic.h>
30
31 #include "sd-journal.h"
32 #include "journal-def.h"
33 #include "journal-file.h"
34 #include "hashmap.h"
35 #include "list.h"
36 #include "strv.h"
37 #include "path-util.h"
38 #include "lookup3.h"
39 #include "compress.h"
40 #include "journal-internal.h"
41 #include "missing.h"
42 #include "catalog.h"
43 #include "replace-var.h"
44 #include "fileio.h"
45
46 #define JOURNAL_FILES_MAX 1024
47
48 #define JOURNAL_FILES_RECHECK_USEC (2 * USEC_PER_SEC)
49
50 #define REPLACE_VAR_MAX 256
51
52 #define DEFAULT_DATA_THRESHOLD (64*1024)
53
54 static void remove_file_real(sd_journal *j, JournalFile *f);
55
56 static bool journal_pid_changed(sd_journal *j) {
57         assert(j);
58
59         /* We don't support people creating a journal object and
60          * keeping it around over a fork(). Let's complain. */
61
62         return j->original_pid != getpid();
63 }
64
65 /* We return an error here only if we didn't manage to
66    memorize the real error. */
67 static int set_put_error(sd_journal *j, int r) {
68         int k;
69
70         if (r >= 0)
71                 return r;
72
73         k = set_ensure_allocated(&j->errors, trivial_hash_func, trivial_compare_func);
74         if (k < 0)
75                 return k;
76
77         return set_put(j->errors, INT_TO_PTR(r));
78 }
79
80 static void detach_location(sd_journal *j) {
81         Iterator i;
82         JournalFile *f;
83
84         assert(j);
85
86         j->current_file = NULL;
87         j->current_field = 0;
88
89         HASHMAP_FOREACH(f, j->files, i)
90                 f->current_offset = 0;
91 }
92
93 static void reset_location(sd_journal *j) {
94         assert(j);
95
96         detach_location(j);
97         zero(j->current_location);
98 }
99
100 static void init_location(Location *l, LocationType type, JournalFile *f, Object *o) {
101         assert(l);
102         assert(type == LOCATION_DISCRETE || type == LOCATION_SEEK);
103         assert(f);
104         assert(o->object.type == OBJECT_ENTRY);
105
106         l->type = type;
107         l->seqnum = le64toh(o->entry.seqnum);
108         l->seqnum_id = f->header->seqnum_id;
109         l->realtime = le64toh(o->entry.realtime);
110         l->monotonic = le64toh(o->entry.monotonic);
111         l->boot_id = o->entry.boot_id;
112         l->xor_hash = le64toh(o->entry.xor_hash);
113
114         l->seqnum_set = l->realtime_set = l->monotonic_set = l->xor_hash_set = true;
115 }
116
117 static void set_location(sd_journal *j, LocationType type, JournalFile *f, Object *o,
118                          direction_t direction, uint64_t offset) {
119         assert(j);
120         assert(type == LOCATION_DISCRETE || type == LOCATION_SEEK);
121         assert(f);
122         assert(o);
123
124         init_location(&j->current_location, type, f, o);
125
126         j->current_file = f;
127         j->current_field = 0;
128
129         f->last_direction = direction;
130         f->current_offset = offset;
131 }
132
133 static int match_is_valid(const void *data, size_t size) {
134         const char *b, *p;
135
136         assert(data);
137
138         if (size < 2)
139                 return false;
140
141         if (startswith(data, "__"))
142                 return false;
143
144         b = data;
145         for (p = b; p < b + size; p++) {
146
147                 if (*p == '=')
148                         return p > b;
149
150                 if (*p == '_')
151                         continue;
152
153                 if (*p >= 'A' && *p <= 'Z')
154                         continue;
155
156                 if (*p >= '0' && *p <= '9')
157                         continue;
158
159                 return false;
160         }
161
162         return false;
163 }
164
165 static bool same_field(const void *_a, size_t s, const void *_b, size_t t) {
166         const uint8_t *a = _a, *b = _b;
167         size_t j;
168
169         for (j = 0; j < s && j < t; j++) {
170
171                 if (a[j] != b[j])
172                         return false;
173
174                 if (a[j] == '=')
175                         return true;
176         }
177
178         assert_not_reached("\"=\" not found");
179 }
180
181 static Match *match_new(Match *p, MatchType t) {
182         Match *m;
183
184         m = new0(Match, 1);
185         if (!m)
186                 return NULL;
187
188         m->type = t;
189
190         if (p) {
191                 m->parent = p;
192                 LIST_PREPEND(matches, p->matches, m);
193         }
194
195         return m;
196 }
197
198 static void match_free(Match *m) {
199         assert(m);
200
201         while (m->matches)
202                 match_free(m->matches);
203
204         if (m->parent)
205                 LIST_REMOVE(matches, m->parent->matches, m);
206
207         free(m->data);
208         free(m);
209 }
210
211 static void match_free_if_empty(Match *m) {
212         if (!m || m->matches)
213                 return;
214
215         match_free(m);
216 }
217
218 _public_ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
219         Match *l3, *l4, *add_here = NULL, *m;
220         le64_t le_hash;
221
222         assert_return(j, -EINVAL);
223         assert_return(!journal_pid_changed(j), -ECHILD);
224         assert_return(data, -EINVAL);
225
226         if (size == 0)
227                 size = strlen(data);
228
229         assert_return(match_is_valid(data, size), -EINVAL);
230
231         /* level 0: AND term
232          * level 1: OR terms
233          * level 2: AND terms
234          * level 3: OR terms
235          * level 4: concrete matches */
236
237         if (!j->level0) {
238                 j->level0 = match_new(NULL, MATCH_AND_TERM);
239                 if (!j->level0)
240                         return -ENOMEM;
241         }
242
243         if (!j->level1) {
244                 j->level1 = match_new(j->level0, MATCH_OR_TERM);
245                 if (!j->level1)
246                         return -ENOMEM;
247         }
248
249         if (!j->level2) {
250                 j->level2 = match_new(j->level1, MATCH_AND_TERM);
251                 if (!j->level2)
252                         return -ENOMEM;
253         }
254
255         assert(j->level0->type == MATCH_AND_TERM);
256         assert(j->level1->type == MATCH_OR_TERM);
257         assert(j->level2->type == MATCH_AND_TERM);
258
259         le_hash = htole64(hash64(data, size));
260
261         LIST_FOREACH(matches, l3, j->level2->matches) {
262                 assert(l3->type == MATCH_OR_TERM);
263
264                 LIST_FOREACH(matches, l4, l3->matches) {
265                         assert(l4->type == MATCH_DISCRETE);
266
267                         /* Exactly the same match already? Then ignore
268                          * this addition */
269                         if (l4->le_hash == le_hash &&
270                             l4->size == size &&
271                             memcmp(l4->data, data, size) == 0)
272                                 return 0;
273
274                         /* Same field? Then let's add this to this OR term */
275                         if (same_field(data, size, l4->data, l4->size)) {
276                                 add_here = l3;
277                                 break;
278                         }
279                 }
280
281                 if (add_here)
282                         break;
283         }
284
285         if (!add_here) {
286                 add_here = match_new(j->level2, MATCH_OR_TERM);
287                 if (!add_here)
288                         goto fail;
289         }
290
291         m = match_new(add_here, MATCH_DISCRETE);
292         if (!m)
293                 goto fail;
294
295         m->le_hash = le_hash;
296         m->size = size;
297         m->data = memdup(data, size);
298         if (!m->data)
299                 goto fail;
300
301         detach_location(j);
302
303         return 0;
304
305 fail:
306         match_free_if_empty(add_here);
307         match_free_if_empty(j->level2);
308         match_free_if_empty(j->level1);
309         match_free_if_empty(j->level0);
310
311         return -ENOMEM;
312 }
313
314 _public_ int sd_journal_add_conjunction(sd_journal *j) {
315         assert_return(j, -EINVAL);
316         assert_return(!journal_pid_changed(j), -ECHILD);
317
318         if (!j->level0)
319                 return 0;
320
321         if (!j->level1)
322                 return 0;
323
324         if (!j->level1->matches)
325                 return 0;
326
327         j->level1 = NULL;
328         j->level2 = NULL;
329
330         return 0;
331 }
332
333 _public_ int sd_journal_add_disjunction(sd_journal *j) {
334         assert_return(j, -EINVAL);
335         assert_return(!journal_pid_changed(j), -ECHILD);
336
337         if (!j->level0)
338                 return 0;
339
340         if (!j->level1)
341                 return 0;
342
343         if (!j->level2)
344                 return 0;
345
346         if (!j->level2->matches)
347                 return 0;
348
349         j->level2 = NULL;
350         return 0;
351 }
352
353 static char *match_make_string(Match *m) {
354         char *p, *r;
355         Match *i;
356         bool enclose = false;
357
358         if (!m)
359                 return strdup("none");
360
361         if (m->type == MATCH_DISCRETE)
362                 return strndup(m->data, m->size);
363
364         p = NULL;
365         LIST_FOREACH(matches, i, m->matches) {
366                 char *t, *k;
367
368                 t = match_make_string(i);
369                 if (!t) {
370                         free(p);
371                         return NULL;
372                 }
373
374                 if (p) {
375                         k = strjoin(p, m->type == MATCH_OR_TERM ? " OR " : " AND ", t, NULL);
376                         free(p);
377                         free(t);
378
379                         if (!k)
380                                 return NULL;
381
382                         p = k;
383
384                         enclose = true;
385                 } else
386                         p = t;
387         }
388
389         if (enclose) {
390                 r = strjoin("(", p, ")", NULL);
391                 free(p);
392                 return r;
393         }
394
395         return p;
396 }
397
398 char *journal_make_match_string(sd_journal *j) {
399         assert(j);
400
401         return match_make_string(j->level0);
402 }
403
404 _public_ void sd_journal_flush_matches(sd_journal *j) {
405         if (!j)
406                 return;
407
408         if (j->level0)
409                 match_free(j->level0);
410
411         j->level0 = j->level1 = j->level2 = NULL;
412
413         detach_location(j);
414 }
415
416 static int compare_entry_order(JournalFile *af, Object *_ao,
417                                JournalFile *bf, uint64_t bp) {
418
419         uint64_t a, b;
420         Object *ao, *bo;
421         int r;
422
423         assert(af);
424         assert(bf);
425         assert(_ao);
426
427         /* The mmap cache might invalidate the object from the first
428          * file if we look at the one from the second file. Hence
429          * temporarily copy the header of the first one, and look at
430          * that only. */
431         ao = alloca(offsetof(EntryObject, items));
432         memcpy(ao, _ao, offsetof(EntryObject, items));
433
434         r = journal_file_move_to_object(bf, OBJECT_ENTRY, bp, &bo);
435         if (r < 0)
436                 return strcmp(af->path, bf->path);
437
438         /* We operate on two different files here, hence we can access
439          * two objects at the same time, which we normally can't.
440          *
441          * If contents and timestamps match, these entries are
442          * identical, even if the seqnum does not match */
443
444         if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id) &&
445             ao->entry.monotonic == bo->entry.monotonic &&
446             ao->entry.realtime == bo->entry.realtime &&
447             ao->entry.xor_hash == bo->entry.xor_hash)
448                 return 0;
449
450         if (sd_id128_equal(af->header->seqnum_id, bf->header->seqnum_id)) {
451
452                 /* If this is from the same seqnum source, compare
453                  * seqnums */
454                 a = le64toh(ao->entry.seqnum);
455                 b = le64toh(bo->entry.seqnum);
456
457                 if (a < b)
458                         return -1;
459                 if (a > b)
460                         return 1;
461
462                 /* Wow! This is weird, different data but the same
463                  * seqnums? Something is borked, but let's make the
464                  * best of it and compare by time. */
465         }
466
467         if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id)) {
468
469                 /* If the boot id matches, compare monotonic time */
470                 a = le64toh(ao->entry.monotonic);
471                 b = le64toh(bo->entry.monotonic);
472
473                 if (a < b)
474                         return -1;
475                 if (a > b)
476                         return 1;
477         }
478
479         /* Otherwise, compare UTC time */
480         a = le64toh(ao->entry.realtime);
481         b = le64toh(bo->entry.realtime);
482
483         if (a < b)
484                 return -1;
485         if (a > b)
486                 return 1;
487
488         /* Finally, compare by contents */
489         a = le64toh(ao->entry.xor_hash);
490         b = le64toh(bo->entry.xor_hash);
491
492         if (a < b)
493                 return -1;
494         if (a > b)
495                 return 1;
496
497         return 0;
498 }
499
500 _pure_ static int compare_with_location(JournalFile *af, Object *ao, Location *l) {
501         uint64_t a;
502
503         assert(af);
504         assert(ao);
505         assert(l);
506         assert(l->type == LOCATION_DISCRETE || l->type == LOCATION_SEEK);
507
508         if (l->monotonic_set &&
509             sd_id128_equal(ao->entry.boot_id, l->boot_id) &&
510             l->realtime_set &&
511             le64toh(ao->entry.realtime) == l->realtime &&
512             l->xor_hash_set &&
513             le64toh(ao->entry.xor_hash) == l->xor_hash)
514                 return 0;
515
516         if (l->seqnum_set &&
517             sd_id128_equal(af->header->seqnum_id, l->seqnum_id)) {
518
519                 a = le64toh(ao->entry.seqnum);
520
521                 if (a < l->seqnum)
522                         return -1;
523                 if (a > l->seqnum)
524                         return 1;
525         }
526
527         if (l->monotonic_set &&
528             sd_id128_equal(ao->entry.boot_id, l->boot_id)) {
529
530                 a = le64toh(ao->entry.monotonic);
531
532                 if (a < l->monotonic)
533                         return -1;
534                 if (a > l->monotonic)
535                         return 1;
536         }
537
538         if (l->realtime_set) {
539
540                 a = le64toh(ao->entry.realtime);
541
542                 if (a < l->realtime)
543                         return -1;
544                 if (a > l->realtime)
545                         return 1;
546         }
547
548         if (l->xor_hash_set) {
549                 a = le64toh(ao->entry.xor_hash);
550
551                 if (a < l->xor_hash)
552                         return -1;
553                 if (a > l->xor_hash)
554                         return 1;
555         }
556
557         return 0;
558 }
559
560 static int next_for_match(
561                 sd_journal *j,
562                 Match *m,
563                 JournalFile *f,
564                 uint64_t after_offset,
565                 direction_t direction,
566                 Object **ret,
567                 uint64_t *offset) {
568
569         int r;
570         uint64_t np = 0;
571         Object *n;
572
573         assert(j);
574         assert(m);
575         assert(f);
576
577         if (m->type == MATCH_DISCRETE) {
578                 uint64_t dp;
579
580                 r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), NULL, &dp);
581                 if (r <= 0)
582                         return r;
583
584                 return journal_file_move_to_entry_by_offset_for_data(f, dp, after_offset, direction, ret, offset);
585
586         } else if (m->type == MATCH_OR_TERM) {
587                 Match *i;
588
589                 /* Find the earliest match beyond after_offset */
590
591                 LIST_FOREACH(matches, i, m->matches) {
592                         uint64_t cp;
593
594                         r = next_for_match(j, i, f, after_offset, direction, NULL, &cp);
595                         if (r < 0)
596                                 return r;
597                         else if (r > 0) {
598                                 if (np == 0 || (direction == DIRECTION_DOWN ? cp < np : cp > np))
599                                         np = cp;
600                         }
601                 }
602
603                 if (np == 0)
604                         return 0;
605
606         } else if (m->type == MATCH_AND_TERM) {
607                 Match *i, *last_moved;
608
609                 /* Always jump to the next matching entry and repeat
610                  * this until we find an offset that matches for all
611                  * matches. */
612
613                 if (!m->matches)
614                         return 0;
615
616                 r = next_for_match(j, m->matches, f, after_offset, direction, NULL, &np);
617                 if (r <= 0)
618                         return r;
619
620                 assert(direction == DIRECTION_DOWN ? np >= after_offset : np <= after_offset);
621                 last_moved = m->matches;
622
623                 LIST_LOOP_BUT_ONE(matches, i, m->matches, last_moved) {
624                         uint64_t cp;
625
626                         r = next_for_match(j, i, f, np, direction, NULL, &cp);
627                         if (r <= 0)
628                                 return r;
629
630                         assert(direction == DIRECTION_DOWN ? cp >= np : cp <= np);
631                         if (direction == DIRECTION_DOWN ? cp > np : cp < np) {
632                                 np = cp;
633                                 last_moved = i;
634                         }
635                 }
636         }
637
638         assert(np > 0);
639
640         r = journal_file_move_to_object(f, OBJECT_ENTRY, np, &n);
641         if (r < 0)
642                 return r;
643
644         if (ret)
645                 *ret = n;
646         if (offset)
647                 *offset = np;
648
649         return 1;
650 }
651
652 static int find_location_for_match(
653                 sd_journal *j,
654                 Match *m,
655                 JournalFile *f,
656                 direction_t direction,
657                 Object **ret,
658                 uint64_t *offset) {
659
660         int r;
661
662         assert(j);
663         assert(m);
664         assert(f);
665
666         if (m->type == MATCH_DISCRETE) {
667                 uint64_t dp;
668
669                 r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), NULL, &dp);
670                 if (r <= 0)
671                         return r;
672
673                 /* FIXME: missing: find by monotonic */
674
675                 if (j->current_location.type == LOCATION_HEAD)
676                         return journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_DOWN, ret, offset);
677                 if (j->current_location.type == LOCATION_TAIL)
678                         return journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_UP, ret, offset);
679                 if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
680                         return journal_file_move_to_entry_by_seqnum_for_data(f, dp, j->current_location.seqnum, direction, ret, offset);
681                 if (j->current_location.monotonic_set) {
682                         r = journal_file_move_to_entry_by_monotonic_for_data(f, dp, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
683                         if (r != -ENOENT)
684                                 return r;
685                 }
686                 if (j->current_location.realtime_set)
687                         return journal_file_move_to_entry_by_realtime_for_data(f, dp, j->current_location.realtime, direction, ret, offset);
688
689                 return journal_file_next_entry_for_data(f, NULL, 0, dp, direction, ret, offset);
690
691         } else if (m->type == MATCH_OR_TERM) {
692                 uint64_t np = 0;
693                 Object *n;
694                 Match *i;
695
696                 /* Find the earliest match */
697
698                 LIST_FOREACH(matches, i, m->matches) {
699                         uint64_t cp;
700
701                         r = find_location_for_match(j, i, f, direction, NULL, &cp);
702                         if (r < 0)
703                                 return r;
704                         else if (r > 0) {
705                                 if (np == 0 || (direction == DIRECTION_DOWN ? np > cp : np < cp))
706                                         np = cp;
707                         }
708                 }
709
710                 if (np == 0)
711                         return 0;
712
713                 r = journal_file_move_to_object(f, OBJECT_ENTRY, np, &n);
714                 if (r < 0)
715                         return r;
716
717                 if (ret)
718                         *ret = n;
719                 if (offset)
720                         *offset = np;
721
722                 return 1;
723
724         } else {
725                 Match *i;
726                 uint64_t np = 0;
727
728                 assert(m->type == MATCH_AND_TERM);
729
730                 /* First jump to the last match, and then find the
731                  * next one where all matches match */
732
733                 if (!m->matches)
734                         return 0;
735
736                 LIST_FOREACH(matches, i, m->matches) {
737                         uint64_t cp;
738
739                         r = find_location_for_match(j, i, f, direction, NULL, &cp);
740                         if (r <= 0)
741                                 return r;
742
743                         if (np == 0 || (direction == DIRECTION_DOWN ? cp > np : cp < np))
744                                 np = cp;
745                 }
746
747                 return next_for_match(j, m, f, np, direction, ret, offset);
748         }
749 }
750
751 static int find_location_with_matches(
752                 sd_journal *j,
753                 JournalFile *f,
754                 direction_t direction,
755                 Object **ret,
756                 uint64_t *offset) {
757
758         int r;
759
760         assert(j);
761         assert(f);
762         assert(ret);
763         assert(offset);
764
765         if (!j->level0) {
766                 /* No matches is simple */
767
768                 if (j->current_location.type == LOCATION_HEAD)
769                         return journal_file_next_entry(f, NULL, 0, DIRECTION_DOWN, ret, offset);
770                 if (j->current_location.type == LOCATION_TAIL)
771                         return journal_file_next_entry(f, NULL, 0, DIRECTION_UP, ret, offset);
772                 if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
773                         return journal_file_move_to_entry_by_seqnum(f, j->current_location.seqnum, direction, ret, offset);
774                 if (j->current_location.monotonic_set) {
775                         r = journal_file_move_to_entry_by_monotonic(f, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
776                         if (r != -ENOENT)
777                                 return r;
778                 }
779                 if (j->current_location.realtime_set)
780                         return journal_file_move_to_entry_by_realtime(f, j->current_location.realtime, direction, ret, offset);
781
782                 return journal_file_next_entry(f, NULL, 0, direction, ret, offset);
783         } else
784                 return find_location_for_match(j, j->level0, f, direction, ret, offset);
785 }
786
787 static int next_with_matches(
788                 sd_journal *j,
789                 JournalFile *f,
790                 direction_t direction,
791                 Object **ret,
792                 uint64_t *offset) {
793
794         Object *c;
795         uint64_t cp;
796
797         assert(j);
798         assert(f);
799         assert(ret);
800         assert(offset);
801
802         c = *ret;
803         cp = *offset;
804
805         /* No matches is easy. We simple advance the file
806          * pointer by one. */
807         if (!j->level0)
808                 return journal_file_next_entry(f, c, cp, direction, ret, offset);
809
810         /* If we have a match then we look for the next matching entry
811          * with an offset at least one step larger */
812         return next_for_match(j, j->level0, f, direction == DIRECTION_DOWN ? cp+1 : cp-1, direction, ret, offset);
813 }
814
815 static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) {
816         Object *c;
817         uint64_t cp;
818         int r;
819
820         assert(j);
821         assert(f);
822
823         if (f->last_direction == direction && f->current_offset > 0) {
824                 cp = f->current_offset;
825
826                 r = journal_file_move_to_object(f, OBJECT_ENTRY, cp, &c);
827                 if (r < 0)
828                         return r;
829
830                 r = next_with_matches(j, f, direction, &c, &cp);
831                 if (r <= 0)
832                         return r;
833         } else {
834                 r = find_location_with_matches(j, f, direction, &c, &cp);
835                 if (r <= 0)
836                         return r;
837         }
838
839         /* OK, we found the spot, now let's advance until an entry
840          * that is actually different from what we were previously
841          * looking at. This is necessary to handle entries which exist
842          * in two (or more) journal files, and which shall all be
843          * suppressed but one. */
844
845         for (;;) {
846                 bool found;
847
848                 if (j->current_location.type == LOCATION_DISCRETE) {
849                         int k;
850
851                         k = compare_with_location(f, c, &j->current_location);
852                         if (direction == DIRECTION_DOWN)
853                                 found = k > 0;
854                         else
855                                 found = k < 0;
856                 } else
857                         found = true;
858
859                 if (found) {
860                         if (ret)
861                                 *ret = c;
862                         if (offset)
863                                 *offset = cp;
864                         return 1;
865                 }
866
867                 r = next_with_matches(j, f, direction, &c, &cp);
868                 if (r <= 0)
869                         return r;
870         }
871 }
872
873 static int real_journal_next(sd_journal *j, direction_t direction) {
874         JournalFile *f, *new_file = NULL;
875         uint64_t new_offset = 0;
876         uint64_t p = 0;
877         Iterator i;
878         Object *o;
879         int r;
880
881         assert_return(j, -EINVAL);
882         assert_return(!journal_pid_changed(j), -ECHILD);
883
884         HASHMAP_FOREACH(f, j->files, i) {
885                 bool found;
886
887                 r = next_beyond_location(j, f, direction, &o, &p);
888                 if (r < 0) {
889                         log_debug("Can't iterate through %s, ignoring: %s", f->path, strerror(-r));
890                         remove_file_real(j, f);
891                         continue;
892                 } else if (r == 0)
893                         continue;
894
895                 if (!new_file)
896                         found = true;
897                 else {
898                         int k;
899
900                         k = compare_entry_order(f, o, new_file, new_offset);
901
902                         found = direction == DIRECTION_DOWN ? k < 0 : k > 0;
903                 }
904
905                 if (found) {
906                         new_file = f;
907                         new_offset = p;
908                 }
909         }
910
911         if (!new_file)
912                 return 0;
913
914         r = journal_file_move_to_object(new_file, OBJECT_ENTRY, new_offset, &o);
915         if (r < 0)
916                 return r;
917
918         set_location(j, LOCATION_DISCRETE, new_file, o, direction, new_offset);
919
920         return 1;
921 }
922
923 _public_ int sd_journal_next(sd_journal *j) {
924         return real_journal_next(j, DIRECTION_DOWN);
925 }
926
927 _public_ int sd_journal_previous(sd_journal *j) {
928         return real_journal_next(j, DIRECTION_UP);
929 }
930
931 static int real_journal_next_skip(sd_journal *j, direction_t direction, uint64_t skip) {
932         int c = 0, r;
933
934         assert_return(j, -EINVAL);
935         assert_return(!journal_pid_changed(j), -ECHILD);
936
937         if (skip == 0) {
938                 /* If this is not a discrete skip, then at least
939                  * resolve the current location */
940                 if (j->current_location.type != LOCATION_DISCRETE)
941                         return real_journal_next(j, direction);
942
943                 return 0;
944         }
945
946         do {
947                 r = real_journal_next(j, direction);
948                 if (r < 0)
949                         return r;
950
951                 if (r == 0)
952                         return c;
953
954                 skip--;
955                 c++;
956         } while (skip > 0);
957
958         return c;
959 }
960
961 _public_ int sd_journal_next_skip(sd_journal *j, uint64_t skip) {
962         return real_journal_next_skip(j, DIRECTION_DOWN, skip);
963 }
964
965 _public_ int sd_journal_previous_skip(sd_journal *j, uint64_t skip) {
966         return real_journal_next_skip(j, DIRECTION_UP, skip);
967 }
968
969 _public_ int sd_journal_get_cursor(sd_journal *j, char **cursor) {
970         Object *o;
971         int r;
972         char bid[33], sid[33];
973
974         assert_return(j, -EINVAL);
975         assert_return(!journal_pid_changed(j), -ECHILD);
976         assert_return(cursor, -EINVAL);
977
978         if (!j->current_file || j->current_file->current_offset <= 0)
979                 return -EADDRNOTAVAIL;
980
981         r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
982         if (r < 0)
983                 return r;
984
985         sd_id128_to_string(j->current_file->header->seqnum_id, sid);
986         sd_id128_to_string(o->entry.boot_id, bid);
987
988         if (asprintf(cursor,
989                      "s=%s;i=%"PRIx64";b=%s;m=%"PRIx64";t=%"PRIx64";x=%"PRIx64,
990                      sid, le64toh(o->entry.seqnum),
991                      bid, le64toh(o->entry.monotonic),
992                      le64toh(o->entry.realtime),
993                      le64toh(o->entry.xor_hash)) < 0)
994                 return -ENOMEM;
995
996         return 0;
997 }
998
999 _public_ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
1000         char *w, *state;
1001         size_t l;
1002         unsigned long long seqnum, monotonic, realtime, xor_hash;
1003         bool
1004                 seqnum_id_set = false,
1005                 seqnum_set = false,
1006                 boot_id_set = false,
1007                 monotonic_set = false,
1008                 realtime_set = false,
1009                 xor_hash_set = false;
1010         sd_id128_t seqnum_id, boot_id;
1011
1012         assert_return(j, -EINVAL);
1013         assert_return(!journal_pid_changed(j), -ECHILD);
1014         assert_return(!isempty(cursor), -EINVAL);
1015
1016         FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
1017                 char *item;
1018                 int k = 0;
1019
1020                 if (l < 2 || w[1] != '=')
1021                         return -EINVAL;
1022
1023                 item = strndup(w, l);
1024                 if (!item)
1025                         return -ENOMEM;
1026
1027                 switch (w[0]) {
1028
1029                 case 's':
1030                         seqnum_id_set = true;
1031                         k = sd_id128_from_string(item+2, &seqnum_id);
1032                         break;
1033
1034                 case 'i':
1035                         seqnum_set = true;
1036                         if (sscanf(item+2, "%llx", &seqnum) != 1)
1037                                 k = -EINVAL;
1038                         break;
1039
1040                 case 'b':
1041                         boot_id_set = true;
1042                         k = sd_id128_from_string(item+2, &boot_id);
1043                         break;
1044
1045                 case 'm':
1046                         monotonic_set = true;
1047                         if (sscanf(item+2, "%llx", &monotonic) != 1)
1048                                 k = -EINVAL;
1049                         break;
1050
1051                 case 't':
1052                         realtime_set = true;
1053                         if (sscanf(item+2, "%llx", &realtime) != 1)
1054                                 k = -EINVAL;
1055                         break;
1056
1057                 case 'x':
1058                         xor_hash_set = true;
1059                         if (sscanf(item+2, "%llx", &xor_hash) != 1)
1060                                 k = -EINVAL;
1061                         break;
1062                 }
1063
1064                 free(item);
1065
1066                 if (k < 0)
1067                         return k;
1068         }
1069
1070         if ((!seqnum_set || !seqnum_id_set) &&
1071             (!monotonic_set || !boot_id_set) &&
1072             !realtime_set)
1073                 return -EINVAL;
1074
1075         reset_location(j);
1076
1077         j->current_location.type = LOCATION_SEEK;
1078
1079         if (realtime_set) {
1080                 j->current_location.realtime = (uint64_t) realtime;
1081                 j->current_location.realtime_set = true;
1082         }
1083
1084         if (seqnum_set && seqnum_id_set) {
1085                 j->current_location.seqnum = (uint64_t) seqnum;
1086                 j->current_location.seqnum_id = seqnum_id;
1087                 j->current_location.seqnum_set = true;
1088         }
1089
1090         if (monotonic_set && boot_id_set) {
1091                 j->current_location.monotonic = (uint64_t) monotonic;
1092                 j->current_location.boot_id = boot_id;
1093                 j->current_location.monotonic_set = true;
1094         }
1095
1096         if (xor_hash_set) {
1097                 j->current_location.xor_hash = (uint64_t) xor_hash;
1098                 j->current_location.xor_hash_set = true;
1099         }
1100
1101         return 0;
1102 }
1103
1104 _public_ int sd_journal_test_cursor(sd_journal *j, const char *cursor) {
1105         int r;
1106         char *w, *state;
1107         size_t l;
1108         Object *o;
1109
1110         assert_return(j, -EINVAL);
1111         assert_return(!journal_pid_changed(j), -ECHILD);
1112         assert_return(!isempty(cursor), -EINVAL);
1113
1114         if (!j->current_file || j->current_file->current_offset <= 0)
1115                 return -EADDRNOTAVAIL;
1116
1117         r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
1118         if (r < 0)
1119                 return r;
1120
1121         FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
1122                 _cleanup_free_ char *item = NULL;
1123                 sd_id128_t id;
1124                 unsigned long long ll;
1125                 int k = 0;
1126
1127                 if (l < 2 || w[1] != '=')
1128                         return -EINVAL;
1129
1130                 item = strndup(w, l);
1131                 if (!item)
1132                         return -ENOMEM;
1133
1134                 switch (w[0]) {
1135
1136                 case 's':
1137                         k = sd_id128_from_string(item+2, &id);
1138                         if (k < 0)
1139                                 return k;
1140                         if (!sd_id128_equal(id, j->current_file->header->seqnum_id))
1141                                 return 0;
1142                         break;
1143
1144                 case 'i':
1145                         if (sscanf(item+2, "%llx", &ll) != 1)
1146                                 return -EINVAL;
1147                         if (ll != le64toh(o->entry.seqnum))
1148                                 return 0;
1149                         break;
1150
1151                 case 'b':
1152                         k = sd_id128_from_string(item+2, &id);
1153                         if (k < 0)
1154                                 return k;
1155                         if (!sd_id128_equal(id, o->entry.boot_id))
1156                                 return 0;
1157                         break;
1158
1159                 case 'm':
1160                         if (sscanf(item+2, "%llx", &ll) != 1)
1161                                 return -EINVAL;
1162                         if (ll != le64toh(o->entry.monotonic))
1163                                 return 0;
1164                         break;
1165
1166                 case 't':
1167                         if (sscanf(item+2, "%llx", &ll) != 1)
1168                                 return -EINVAL;
1169                         if (ll != le64toh(o->entry.realtime))
1170                                 return 0;
1171                         break;
1172
1173                 case 'x':
1174                         if (sscanf(item+2, "%llx", &ll) != 1)
1175                                 return -EINVAL;
1176                         if (ll != le64toh(o->entry.xor_hash))
1177                                 return 0;
1178                         break;
1179                 }
1180         }
1181
1182         return 1;
1183 }
1184
1185
1186 _public_ int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t usec) {
1187         assert_return(j, -EINVAL);
1188         assert_return(!journal_pid_changed(j), -ECHILD);
1189
1190         reset_location(j);
1191         j->current_location.type = LOCATION_SEEK;
1192         j->current_location.boot_id = boot_id;
1193         j->current_location.monotonic = usec;
1194         j->current_location.monotonic_set = true;
1195
1196         return 0;
1197 }
1198
1199 _public_ int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec) {
1200         assert_return(j, -EINVAL);
1201         assert_return(!journal_pid_changed(j), -ECHILD);
1202
1203         reset_location(j);
1204         j->current_location.type = LOCATION_SEEK;
1205         j->current_location.realtime = usec;
1206         j->current_location.realtime_set = true;
1207
1208         return 0;
1209 }
1210
1211 _public_ int sd_journal_seek_head(sd_journal *j) {
1212         assert_return(j, -EINVAL);
1213         assert_return(!journal_pid_changed(j), -ECHILD);
1214
1215         reset_location(j);
1216         j->current_location.type = LOCATION_HEAD;
1217
1218         return 0;
1219 }
1220
1221 _public_ int sd_journal_seek_tail(sd_journal *j) {
1222         assert_return(j, -EINVAL);
1223         assert_return(!journal_pid_changed(j), -ECHILD);
1224
1225         reset_location(j);
1226         j->current_location.type = LOCATION_TAIL;
1227
1228         return 0;
1229 }
1230
1231 static void check_network(sd_journal *j, int fd) {
1232         struct statfs sfs;
1233
1234         assert(j);
1235
1236         if (j->on_network)
1237                 return;
1238
1239         if (fstatfs(fd, &sfs) < 0)
1240                 return;
1241
1242         j->on_network =
1243                 F_TYPE_EQUAL(sfs.f_type, CIFS_MAGIC_NUMBER) ||
1244                 F_TYPE_EQUAL(sfs.f_type, CODA_SUPER_MAGIC) ||
1245                 F_TYPE_EQUAL(sfs.f_type, NCP_SUPER_MAGIC) ||
1246                 F_TYPE_EQUAL(sfs.f_type, NFS_SUPER_MAGIC) ||
1247                 F_TYPE_EQUAL(sfs.f_type, SMB_SUPER_MAGIC);
1248 }
1249
1250 static bool file_has_type_prefix(const char *prefix, const char *filename) {
1251         const char *full, *tilded, *atted;
1252
1253         full = strappenda(prefix, ".journal");
1254         tilded = strappenda(full, "~");
1255         atted = strappenda(prefix, "@");
1256
1257         return streq(filename, full) ||
1258                streq(filename, tilded) ||
1259                startswith(filename, atted);
1260 }
1261
1262 static bool file_type_wanted(int flags, const char *filename) {
1263         if (!endswith(filename, ".journal") && !endswith(filename, ".journal~"))
1264                 return false;
1265
1266         /* no flags set → every type is OK */
1267         if (!(flags & (SD_JOURNAL_SYSTEM | SD_JOURNAL_CURRENT_USER)))
1268                 return true;
1269
1270         if (flags & SD_JOURNAL_SYSTEM && file_has_type_prefix("system", filename))
1271                 return true;
1272
1273         if (flags & SD_JOURNAL_CURRENT_USER) {
1274                 char prefix[5 + DECIMAL_STR_MAX(uid_t) + 1];
1275
1276                 assert_se(snprintf(prefix, sizeof(prefix), "user-%lu", (unsigned long) getuid())
1277                           < (int) sizeof(prefix));
1278
1279                 if (file_has_type_prefix(prefix, filename))
1280                         return true;
1281         }
1282
1283         return false;
1284 }
1285
1286 static int add_any_file(sd_journal *j, const char *path) {
1287         JournalFile *f = NULL;
1288         int r;
1289
1290         assert(j);
1291         assert(path);
1292
1293         if (hashmap_get(j->files, path))
1294                 return 0;
1295
1296         if (hashmap_size(j->files) >= JOURNAL_FILES_MAX) {
1297                 log_warning("Too many open journal files, not adding %s.", path);
1298                 return set_put_error(j, -ETOOMANYREFS);
1299         }
1300
1301         r = journal_file_open(path, O_RDONLY, 0, false, false, NULL, j->mmap, NULL, &f);
1302         if (r < 0)
1303                 return r;
1304
1305         /* journal_file_dump(f); */
1306
1307         r = hashmap_put(j->files, f->path, f);
1308         if (r < 0) {
1309                 journal_file_close(f);
1310                 return r;
1311         }
1312
1313         log_debug("File %s added.", f->path);
1314
1315         check_network(j, f->fd);
1316
1317         j->current_invalidate_counter ++;
1318
1319         return 0;
1320 }
1321
1322 static int add_file(sd_journal *j, const char *prefix, const char *filename) {
1323         _cleanup_free_ char *path = NULL;
1324         int r;
1325
1326         assert(j);
1327         assert(prefix);
1328         assert(filename);
1329
1330         if (j->no_new_files ||
1331             !file_type_wanted(j->flags, filename))
1332                 return 0;
1333
1334         path = strjoin(prefix, "/", filename, NULL);
1335         if (!path)
1336                 return -ENOMEM;
1337
1338         r = add_any_file(j, path);
1339         if (r == -ENOENT)
1340                 return 0;
1341         return 0;
1342 }
1343
1344 static int remove_file(sd_journal *j, const char *prefix, const char *filename) {
1345         _cleanup_free_ char *path;
1346         JournalFile *f;
1347
1348         assert(j);
1349         assert(prefix);
1350         assert(filename);
1351
1352         path = strjoin(prefix, "/", filename, NULL);
1353         if (!path)
1354                 return -ENOMEM;
1355
1356         f = hashmap_get(j->files, path);
1357         if (!f)
1358                 return 0;
1359
1360         remove_file_real(j, f);
1361         return 0;
1362 }
1363
1364 static void remove_file_real(sd_journal *j, JournalFile *f) {
1365         assert(j);
1366         assert(f);
1367
1368         hashmap_remove(j->files, f->path);
1369
1370         log_debug("File %s removed.", f->path);
1371
1372         if (j->current_file == f) {
1373                 j->current_file = NULL;
1374                 j->current_field = 0;
1375         }
1376
1377         if (j->unique_file == f) {
1378                 j->unique_file = NULL;
1379                 j->unique_offset = 0;
1380         }
1381
1382         journal_file_close(f);
1383
1384         j->current_invalidate_counter ++;
1385 }
1386
1387 static int add_directory(sd_journal *j, const char *prefix, const char *dirname) {
1388         _cleanup_free_ char *path = NULL;
1389         int r;
1390         _cleanup_closedir_ DIR *d = NULL;
1391         sd_id128_t id, mid;
1392         Directory *m;
1393
1394         assert(j);
1395         assert(prefix);
1396         assert(dirname);
1397
1398         log_debug("Considering %s/%s.", prefix, dirname);
1399
1400         if ((j->flags & SD_JOURNAL_LOCAL_ONLY) &&
1401             (sd_id128_from_string(dirname, &id) < 0 ||
1402              sd_id128_get_machine(&mid) < 0 ||
1403              !(sd_id128_equal(id, mid) || path_startswith(prefix, "/run"))))
1404             return 0;
1405
1406         path = strjoin(prefix, "/", dirname, NULL);
1407         if (!path)
1408                 return -ENOMEM;
1409
1410         d = opendir(path);
1411         if (!d) {
1412                 log_debug("Failed to open %s: %m", path);
1413                 if (errno == ENOENT)
1414                         return 0;
1415                 return -errno;
1416         }
1417
1418         m = hashmap_get(j->directories_by_path, path);
1419         if (!m) {
1420                 m = new0(Directory, 1);
1421                 if (!m)
1422                         return -ENOMEM;
1423
1424                 m->is_root = false;
1425                 m->path = path;
1426
1427                 if (hashmap_put(j->directories_by_path, m->path, m) < 0) {
1428                         free(m);
1429                         return -ENOMEM;
1430                 }
1431
1432                 path = NULL; /* avoid freeing in cleanup */
1433                 j->current_invalidate_counter ++;
1434
1435                 log_debug("Directory %s added.", m->path);
1436
1437         } else if (m->is_root)
1438                 return 0;
1439
1440         if (m->wd <= 0 && j->inotify_fd >= 0) {
1441
1442                 m->wd = inotify_add_watch(j->inotify_fd, m->path,
1443                                           IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
1444                                           IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|IN_MOVED_FROM|
1445                                           IN_ONLYDIR);
1446
1447                 if (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0)
1448                         inotify_rm_watch(j->inotify_fd, m->wd);
1449         }
1450
1451         for (;;) {
1452                 struct dirent *de;
1453
1454                 errno = 0;
1455                 de = readdir(d);
1456                 if (!de && errno != 0) {
1457                         r = -errno;
1458                         log_debug("Failed to read directory %s: %s",
1459                                   m->path, strerror(errno));
1460                         return r;
1461                 }
1462                 if (!de)
1463                         break;
1464
1465                 if (dirent_is_file_with_suffix(de, ".journal") ||
1466                     dirent_is_file_with_suffix(de, ".journal~")) {
1467                         r = add_file(j, m->path, de->d_name);
1468                         if (r < 0) {
1469                                 log_debug("Failed to add file %s/%s: %s",
1470                                           m->path, de->d_name, strerror(-r));
1471                                 r = set_put_error(j, r);
1472                                 if (r < 0)
1473                                         return r;
1474                         }
1475                 }
1476         }
1477
1478         check_network(j, dirfd(d));
1479
1480         return 0;
1481 }
1482
1483 static int add_root_directory(sd_journal *j, const char *p) {
1484         _cleanup_closedir_ DIR *d = NULL;
1485         Directory *m;
1486         int r;
1487
1488         assert(j);
1489         assert(p);
1490
1491         if ((j->flags & SD_JOURNAL_RUNTIME_ONLY) &&
1492             !path_startswith(p, "/run"))
1493                 return -EINVAL;
1494
1495         if (j->prefix)
1496                 p = strappenda(j->prefix, p);
1497
1498         d = opendir(p);
1499         if (!d)
1500                 return -errno;
1501
1502         m = hashmap_get(j->directories_by_path, p);
1503         if (!m) {
1504                 m = new0(Directory, 1);
1505                 if (!m)
1506                         return -ENOMEM;
1507
1508                 m->is_root = true;
1509                 m->path = strdup(p);
1510                 if (!m->path) {
1511                         free(m);
1512                         return -ENOMEM;
1513                 }
1514
1515                 if (hashmap_put(j->directories_by_path, m->path, m) < 0) {
1516                         free(m->path);
1517                         free(m);
1518                         return -ENOMEM;
1519                 }
1520
1521                 j->current_invalidate_counter ++;
1522
1523                 log_debug("Root directory %s added.", m->path);
1524
1525         } else if (!m->is_root)
1526                 return 0;
1527
1528         if (m->wd <= 0 && j->inotify_fd >= 0) {
1529
1530                 m->wd = inotify_add_watch(j->inotify_fd, m->path,
1531                                           IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
1532                                           IN_ONLYDIR);
1533
1534                 if (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0)
1535                         inotify_rm_watch(j->inotify_fd, m->wd);
1536         }
1537
1538         if (j->no_new_files)
1539                 return 0;
1540
1541         for (;;) {
1542                 struct dirent *de;
1543                 sd_id128_t id;
1544
1545                 errno = 0;
1546                 de = readdir(d);
1547                 if (!de && errno != 0) {
1548                         r = -errno;
1549                         log_debug("Failed to read directory %s: %s",
1550                                   m->path, strerror(errno));
1551                         return r;
1552                 }
1553                 if (!de)
1554                         break;
1555
1556                 if (dirent_is_file_with_suffix(de, ".journal") ||
1557                     dirent_is_file_with_suffix(de, ".journal~")) {
1558                         r = add_file(j, m->path, de->d_name);
1559                         if (r < 0) {
1560                                 log_debug("Failed to add file %s/%s: %s",
1561                                           m->path, de->d_name, strerror(-r));
1562                                 r = set_put_error(j, r);
1563                                 if (r < 0)
1564                                         return r;
1565                         }
1566                 } else if ((de->d_type == DT_DIR || de->d_type == DT_LNK || de->d_type == DT_UNKNOWN) &&
1567                            sd_id128_from_string(de->d_name, &id) >= 0) {
1568
1569                         r = add_directory(j, m->path, de->d_name);
1570                         if (r < 0)
1571                                 log_debug("Failed to add directory %s/%s: %s", m->path, de->d_name, strerror(-r));
1572                 }
1573         }
1574
1575         check_network(j, dirfd(d));
1576
1577         return 0;
1578 }
1579
1580 static int remove_directory(sd_journal *j, Directory *d) {
1581         assert(j);
1582
1583         if (d->wd > 0) {
1584                 hashmap_remove(j->directories_by_wd, INT_TO_PTR(d->wd));
1585
1586                 if (j->inotify_fd >= 0)
1587                         inotify_rm_watch(j->inotify_fd, d->wd);
1588         }
1589
1590         hashmap_remove(j->directories_by_path, d->path);
1591
1592         if (d->is_root)
1593                 log_debug("Root directory %s removed.", d->path);
1594         else
1595                 log_debug("Directory %s removed.", d->path);
1596
1597         free(d->path);
1598         free(d);
1599
1600         return 0;
1601 }
1602
1603 static int add_search_paths(sd_journal *j) {
1604         int r;
1605         const char search_paths[] =
1606                 "/run/log/journal\0"
1607                 "/var/log/journal\0";
1608         const char *p;
1609
1610         assert(j);
1611
1612         /* We ignore most errors here, since the idea is to only open
1613          * what's actually accessible, and ignore the rest. */
1614
1615         NULSTR_FOREACH(p, search_paths) {
1616                 r = add_root_directory(j, p);
1617                 if (r < 0 && r != -ENOENT) {
1618                         r = set_put_error(j, r);
1619                         if (r < 0)
1620                                 return r;
1621                 }
1622         }
1623
1624         return 0;
1625 }
1626
1627 static int add_current_paths(sd_journal *j) {
1628         Iterator i;
1629         JournalFile *f;
1630
1631         assert(j);
1632         assert(j->no_new_files);
1633
1634         /* Simply adds all directories for files we have open as
1635          * "root" directories. We don't expect errors here, so we
1636          * treat them as fatal. */
1637
1638         HASHMAP_FOREACH(f, j->files, i) {
1639                 _cleanup_free_ char *dir;
1640                 int r;
1641
1642                 dir = dirname_malloc(f->path);
1643                 if (!dir)
1644                         return -ENOMEM;
1645
1646                 r = add_root_directory(j, dir);
1647                 if (r < 0) {
1648                         set_put_error(j, r);
1649                         return r;
1650                 }
1651         }
1652
1653         return 0;
1654 }
1655
1656
1657 static int allocate_inotify(sd_journal *j) {
1658         assert(j);
1659
1660         if (j->inotify_fd < 0) {
1661                 j->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
1662                 if (j->inotify_fd < 0)
1663                         return -errno;
1664         }
1665
1666         if (!j->directories_by_wd) {
1667                 j->directories_by_wd = hashmap_new(trivial_hash_func, trivial_compare_func);
1668                 if (!j->directories_by_wd)
1669                         return -ENOMEM;
1670         }
1671
1672         return 0;
1673 }
1674
1675 static sd_journal *journal_new(int flags, const char *path) {
1676         sd_journal *j;
1677
1678         j = new0(sd_journal, 1);
1679         if (!j)
1680                 return NULL;
1681
1682         j->original_pid = getpid();
1683         j->inotify_fd = -1;
1684         j->flags = flags;
1685         j->data_threshold = DEFAULT_DATA_THRESHOLD;
1686
1687         if (path) {
1688                 j->path = strdup(path);
1689                 if (!j->path)
1690                         goto fail;
1691         }
1692
1693         j->files = hashmap_new(string_hash_func, string_compare_func);
1694         j->directories_by_path = hashmap_new(string_hash_func, string_compare_func);
1695         j->mmap = mmap_cache_new();
1696         if (!j->files || !j->directories_by_path || !j->mmap)
1697                 goto fail;
1698
1699         return j;
1700
1701 fail:
1702         sd_journal_close(j);
1703         return NULL;
1704 }
1705
1706 _public_ int sd_journal_open(sd_journal **ret, int flags) {
1707         sd_journal *j;
1708         int r;
1709
1710         assert_return(ret, -EINVAL);
1711         assert_return((flags & ~(SD_JOURNAL_LOCAL_ONLY|SD_JOURNAL_RUNTIME_ONLY|SD_JOURNAL_SYSTEM|SD_JOURNAL_CURRENT_USER)) == 0, -EINVAL);
1712
1713         j = journal_new(flags, NULL);
1714         if (!j)
1715                 return -ENOMEM;
1716
1717         r = add_search_paths(j);
1718         if (r < 0)
1719                 goto fail;
1720
1721         *ret = j;
1722         return 0;
1723
1724 fail:
1725         sd_journal_close(j);
1726
1727         return r;
1728 }
1729
1730 _public_ int sd_journal_open_container(sd_journal **ret, const char *machine, int flags) {
1731         _cleanup_free_ char *root = NULL, *class = NULL;
1732         sd_journal *j;
1733         char *p;
1734         int r;
1735
1736         assert_return(machine, -EINVAL);
1737         assert_return(ret, -EINVAL);
1738         assert_return((flags & ~(SD_JOURNAL_LOCAL_ONLY|SD_JOURNAL_SYSTEM)) == 0, -EINVAL);
1739         assert_return(filename_is_safe(machine), -EINVAL);
1740
1741         p = strappenda("/run/systemd/machines/", machine);
1742         r = parse_env_file(p, NEWLINE, "ROOT", &root, "CLASS", &class, NULL);
1743         if (r == -ENOENT)
1744                 return -EHOSTDOWN;
1745         if (r < 0)
1746                 return r;
1747         if (!root)
1748                 return -ENODATA;
1749
1750         if (!streq_ptr(class, "container"))
1751                 return -EIO;
1752
1753         j = journal_new(flags, NULL);
1754         if (!j)
1755                 return -ENOMEM;
1756
1757         j->prefix = root;
1758         root = NULL;
1759
1760         r = add_search_paths(j);
1761         if (r < 0)
1762                 goto fail;
1763
1764         *ret = j;
1765         return 0;
1766
1767 fail:
1768         sd_journal_close(j);
1769         return r;
1770 }
1771
1772 _public_ int sd_journal_open_directory(sd_journal **ret, const char *path, int flags) {
1773         sd_journal *j;
1774         int r;
1775
1776         assert_return(ret, -EINVAL);
1777         assert_return(path, -EINVAL);
1778         assert_return(flags == 0, -EINVAL);
1779
1780         j = journal_new(flags, path);
1781         if (!j)
1782                 return -ENOMEM;
1783
1784         r = add_root_directory(j, path);
1785         if (r < 0) {
1786                 set_put_error(j, r);
1787                 goto fail;
1788         }
1789
1790         *ret = j;
1791         return 0;
1792
1793 fail:
1794         sd_journal_close(j);
1795
1796         return r;
1797 }
1798
1799 _public_ int sd_journal_open_files(sd_journal **ret, const char **paths, int flags) {
1800         sd_journal *j;
1801         const char **path;
1802         int r;
1803
1804         assert_return(ret, -EINVAL);
1805         assert_return(flags == 0, -EINVAL);
1806
1807         j = journal_new(flags, NULL);
1808         if (!j)
1809                 return -ENOMEM;
1810
1811         STRV_FOREACH(path, paths) {
1812                 r = add_any_file(j, *path);
1813                 if (r < 0) {
1814                         log_error("Failed to open %s: %s", *path, strerror(-r));
1815                         goto fail;
1816                 }
1817         }
1818
1819         j->no_new_files = true;
1820
1821         *ret = j;
1822         return 0;
1823
1824 fail:
1825         sd_journal_close(j);
1826
1827         return r;
1828 }
1829
1830 _public_ void sd_journal_close(sd_journal *j) {
1831         Directory *d;
1832         JournalFile *f;
1833
1834         if (!j)
1835                 return;
1836
1837         sd_journal_flush_matches(j);
1838
1839         while ((f = hashmap_steal_first(j->files)))
1840                 journal_file_close(f);
1841
1842         hashmap_free(j->files);
1843
1844         while ((d = hashmap_first(j->directories_by_path)))
1845                 remove_directory(j, d);
1846
1847         while ((d = hashmap_first(j->directories_by_wd)))
1848                 remove_directory(j, d);
1849
1850         hashmap_free(j->directories_by_path);
1851         hashmap_free(j->directories_by_wd);
1852
1853         safe_close(j->inotify_fd);
1854
1855         if (j->mmap) {
1856                 log_debug("mmap cache statistics: %u hit, %u miss", mmap_cache_get_hit(j->mmap), mmap_cache_get_missed(j->mmap));
1857                 mmap_cache_unref(j->mmap);
1858         }
1859
1860         free(j->path);
1861         free(j->prefix);
1862         free(j->unique_field);
1863         set_free(j->errors);
1864         free(j);
1865 }
1866
1867 _public_ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
1868         Object *o;
1869         JournalFile *f;
1870         int r;
1871
1872         assert_return(j, -EINVAL);
1873         assert_return(!journal_pid_changed(j), -ECHILD);
1874         assert_return(ret, -EINVAL);
1875
1876         f = j->current_file;
1877         if (!f)
1878                 return -EADDRNOTAVAIL;
1879
1880         if (f->current_offset <= 0)
1881                 return -EADDRNOTAVAIL;
1882
1883         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1884         if (r < 0)
1885                 return r;
1886
1887         *ret = le64toh(o->entry.realtime);
1888         return 0;
1889 }
1890
1891 _public_ int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *ret, sd_id128_t *ret_boot_id) {
1892         Object *o;
1893         JournalFile *f;
1894         int r;
1895         sd_id128_t id;
1896
1897         assert_return(j, -EINVAL);
1898         assert_return(!journal_pid_changed(j), -ECHILD);
1899
1900         f = j->current_file;
1901         if (!f)
1902                 return -EADDRNOTAVAIL;
1903
1904         if (f->current_offset <= 0)
1905                 return -EADDRNOTAVAIL;
1906
1907         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1908         if (r < 0)
1909                 return r;
1910
1911         if (ret_boot_id)
1912                 *ret_boot_id = o->entry.boot_id;
1913         else {
1914                 r = sd_id128_get_boot(&id);
1915                 if (r < 0)
1916                         return r;
1917
1918                 if (!sd_id128_equal(id, o->entry.boot_id))
1919                         return -ESTALE;
1920         }
1921
1922         if (ret)
1923                 *ret = le64toh(o->entry.monotonic);
1924
1925         return 0;
1926 }
1927
1928 static bool field_is_valid(const char *field) {
1929         const char *p;
1930
1931         assert(field);
1932
1933         if (isempty(field))
1934                 return false;
1935
1936         if (startswith(field, "__"))
1937                 return false;
1938
1939         for (p = field; *p; p++) {
1940
1941                 if (*p == '_')
1942                         continue;
1943
1944                 if (*p >= 'A' && *p <= 'Z')
1945                         continue;
1946
1947                 if (*p >= '0' && *p <= '9')
1948                         continue;
1949
1950                 return false;
1951         }
1952
1953         return true;
1954 }
1955
1956 _public_ int sd_journal_get_data(sd_journal *j, const char *field, const void **data, size_t *size) {
1957         JournalFile *f;
1958         uint64_t i, n;
1959         size_t field_length;
1960         int r;
1961         Object *o;
1962
1963         assert_return(j, -EINVAL);
1964         assert_return(!journal_pid_changed(j), -ECHILD);
1965         assert_return(field, -EINVAL);
1966         assert_return(data, -EINVAL);
1967         assert_return(size, -EINVAL);
1968         assert_return(field_is_valid(field), -EINVAL);
1969
1970         f = j->current_file;
1971         if (!f)
1972                 return -EADDRNOTAVAIL;
1973
1974         if (f->current_offset <= 0)
1975                 return -EADDRNOTAVAIL;
1976
1977         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1978         if (r < 0)
1979                 return r;
1980
1981         field_length = strlen(field);
1982
1983         n = journal_file_entry_n_items(o);
1984         for (i = 0; i < n; i++) {
1985                 uint64_t p, l;
1986                 le64_t le_hash;
1987                 size_t t;
1988
1989                 p = le64toh(o->entry.items[i].object_offset);
1990                 le_hash = o->entry.items[i].hash;
1991                 r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
1992                 if (r < 0)
1993                         return r;
1994
1995                 if (le_hash != o->data.hash)
1996                         return -EBADMSG;
1997
1998                 l = le64toh(o->object.size) - offsetof(Object, data.payload);
1999
2000                 if (o->object.flags & OBJECT_COMPRESSED) {
2001
2002 #ifdef HAVE_XZ
2003                         if (uncompress_startswith(o->data.payload, l,
2004                                                   &f->compress_buffer, &f->compress_buffer_size,
2005                                                   field, field_length, '=')) {
2006
2007                                 uint64_t rsize;
2008
2009                                 if (!uncompress_blob(o->data.payload, l,
2010                                                      &f->compress_buffer, &f->compress_buffer_size, &rsize,
2011                                                      j->data_threshold))
2012                                         return -EBADMSG;
2013
2014                                 *data = f->compress_buffer;
2015                                 *size = (size_t) rsize;
2016
2017                                 return 0;
2018                         }
2019 #else
2020                         return -EPROTONOSUPPORT;
2021 #endif
2022
2023                 } else if (l >= field_length+1 &&
2024                            memcmp(o->data.payload, field, field_length) == 0 &&
2025                            o->data.payload[field_length] == '=') {
2026
2027                         t = (size_t) l;
2028
2029                         if ((uint64_t) t != l)
2030                                 return -E2BIG;
2031
2032                         *data = o->data.payload;
2033                         *size = t;
2034
2035                         return 0;
2036                 }
2037
2038                 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
2039                 if (r < 0)
2040                         return r;
2041         }
2042
2043         return -ENOENT;
2044 }
2045
2046 static int return_data(sd_journal *j, JournalFile *f, Object *o, const void **data, size_t *size) {
2047         size_t t;
2048         uint64_t l;
2049
2050         l = le64toh(o->object.size) - offsetof(Object, data.payload);
2051         t = (size_t) l;
2052
2053         /* We can't read objects larger than 4G on a 32bit machine */
2054         if ((uint64_t) t != l)
2055                 return -E2BIG;
2056
2057         if (o->object.flags & OBJECT_COMPRESSED) {
2058 #ifdef HAVE_XZ
2059                 uint64_t rsize;
2060
2061                 if (!uncompress_blob(o->data.payload, l, &f->compress_buffer, &f->compress_buffer_size, &rsize, j->data_threshold))
2062                         return -EBADMSG;
2063
2064                 *data = f->compress_buffer;
2065                 *size = (size_t) rsize;
2066 #else
2067                 return -EPROTONOSUPPORT;
2068 #endif
2069         } else {
2070                 *data = o->data.payload;
2071                 *size = t;
2072         }
2073
2074         return 0;
2075 }
2076
2077 _public_ int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) {
2078         JournalFile *f;
2079         uint64_t p, n;
2080         le64_t le_hash;
2081         int r;
2082         Object *o;
2083
2084         assert_return(j, -EINVAL);
2085         assert_return(!journal_pid_changed(j), -ECHILD);
2086         assert_return(data, -EINVAL);
2087         assert_return(size, -EINVAL);
2088
2089         f = j->current_file;
2090         if (!f)
2091                 return -EADDRNOTAVAIL;
2092
2093         if (f->current_offset <= 0)
2094                 return -EADDRNOTAVAIL;
2095
2096         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
2097         if (r < 0)
2098                 return r;
2099
2100         n = journal_file_entry_n_items(o);
2101         if (j->current_field >= n)
2102                 return 0;
2103
2104         p = le64toh(o->entry.items[j->current_field].object_offset);
2105         le_hash = o->entry.items[j->current_field].hash;
2106         r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
2107         if (r < 0)
2108                 return r;
2109
2110         if (le_hash != o->data.hash)
2111                 return -EBADMSG;
2112
2113         r = return_data(j, f, o, data, size);
2114         if (r < 0)
2115                 return r;
2116
2117         j->current_field ++;
2118
2119         return 1;
2120 }
2121
2122 _public_ void sd_journal_restart_data(sd_journal *j) {
2123         if (!j)
2124                 return;
2125
2126         j->current_field = 0;
2127 }
2128
2129 _public_ int sd_journal_get_fd(sd_journal *j) {
2130         int r;
2131
2132         assert_return(j, -EINVAL);
2133         assert_return(!journal_pid_changed(j), -ECHILD);
2134
2135         if (j->inotify_fd >= 0)
2136                 return j->inotify_fd;
2137
2138         r = allocate_inotify(j);
2139         if (r < 0)
2140                 return r;
2141
2142         /* Iterate through all dirs again, to add them to the
2143          * inotify */
2144         if (j->no_new_files)
2145                 r = add_current_paths(j);
2146         else if (j->path)
2147                 r = add_root_directory(j, j->path);
2148         else
2149                 r = add_search_paths(j);
2150         if (r < 0)
2151                 return r;
2152
2153         return j->inotify_fd;
2154 }
2155
2156 _public_ int sd_journal_get_events(sd_journal *j) {
2157         int fd;
2158
2159         assert_return(j, -EINVAL);
2160         assert_return(!journal_pid_changed(j), -ECHILD);
2161
2162         fd = sd_journal_get_fd(j);
2163         if (fd < 0)
2164                 return fd;
2165
2166         return POLLIN;
2167 }
2168
2169 _public_ int sd_journal_get_timeout(sd_journal *j, uint64_t *timeout_usec) {
2170         int fd;
2171
2172         assert_return(j, -EINVAL);
2173         assert_return(!journal_pid_changed(j), -ECHILD);
2174         assert_return(timeout_usec, -EINVAL);
2175
2176         fd = sd_journal_get_fd(j);
2177         if (fd < 0)
2178                 return fd;
2179
2180         if (!j->on_network) {
2181                 *timeout_usec = (uint64_t) -1;
2182                 return 0;
2183         }
2184
2185         /* If we are on the network we need to regularly check for
2186          * changes manually */
2187
2188         *timeout_usec = j->last_process_usec + JOURNAL_FILES_RECHECK_USEC;
2189         return 1;
2190 }
2191
2192 static void process_inotify_event(sd_journal *j, struct inotify_event *e) {
2193         Directory *d;
2194         int r;
2195
2196         assert(j);
2197         assert(e);
2198
2199         /* Is this a subdirectory we watch? */
2200         d = hashmap_get(j->directories_by_wd, INT_TO_PTR(e->wd));
2201         if (d) {
2202                 sd_id128_t id;
2203
2204                 if (!(e->mask & IN_ISDIR) && e->len > 0 &&
2205                     (endswith(e->name, ".journal") ||
2206                      endswith(e->name, ".journal~"))) {
2207
2208                         /* Event for a journal file */
2209
2210                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
2211                                 r = add_file(j, d->path, e->name);
2212                                 if (r < 0) {
2213                                         log_debug("Failed to add file %s/%s: %s",
2214                                                   d->path, e->name, strerror(-r));
2215                                         set_put_error(j, r);
2216                                 }
2217
2218                         } else if (e->mask & (IN_DELETE|IN_MOVED_FROM|IN_UNMOUNT)) {
2219
2220                                 r = remove_file(j, d->path, e->name);
2221                                 if (r < 0)
2222                                         log_debug("Failed to remove file %s/%s: %s", d->path, e->name, strerror(-r));
2223                         }
2224
2225                 } else if (!d->is_root && e->len == 0) {
2226
2227                         /* Event for a subdirectory */
2228
2229                         if (e->mask & (IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT)) {
2230                                 r = remove_directory(j, d);
2231                                 if (r < 0)
2232                                         log_debug("Failed to remove directory %s: %s", d->path, strerror(-r));
2233                         }
2234
2235
2236                 } else if (d->is_root && (e->mask & IN_ISDIR) && e->len > 0 && sd_id128_from_string(e->name, &id) >= 0) {
2237
2238                         /* Event for root directory */
2239
2240                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
2241                                 r = add_directory(j, d->path, e->name);
2242                                 if (r < 0)
2243                                         log_debug("Failed to add directory %s/%s: %s", d->path, e->name, strerror(-r));
2244                         }
2245                 }
2246
2247                 return;
2248         }
2249
2250         if (e->mask & IN_IGNORED)
2251                 return;
2252
2253         log_warning("Unknown inotify event.");
2254 }
2255
2256 static int determine_change(sd_journal *j) {
2257         bool b;
2258
2259         assert(j);
2260
2261         b = j->current_invalidate_counter != j->last_invalidate_counter;
2262         j->last_invalidate_counter = j->current_invalidate_counter;
2263
2264         return b ? SD_JOURNAL_INVALIDATE : SD_JOURNAL_APPEND;
2265 }
2266
2267 _public_ int sd_journal_process(sd_journal *j) {
2268         uint8_t buffer[sizeof(struct inotify_event) + FILENAME_MAX] _alignas_(struct inotify_event);
2269         bool got_something = false;
2270
2271         assert_return(j, -EINVAL);
2272         assert_return(!journal_pid_changed(j), -ECHILD);
2273
2274         j->last_process_usec = now(CLOCK_MONOTONIC);
2275
2276         for (;;) {
2277                 struct inotify_event *e;
2278                 ssize_t l;
2279
2280                 l = read(j->inotify_fd, buffer, sizeof(buffer));
2281                 if (l < 0) {
2282                         if (errno == EAGAIN || errno == EINTR)
2283                                 return got_something ? determine_change(j) : SD_JOURNAL_NOP;
2284
2285                         return -errno;
2286                 }
2287
2288                 got_something = true;
2289
2290                 e = (struct inotify_event*) buffer;
2291                 while (l > 0) {
2292                         size_t step;
2293
2294                         process_inotify_event(j, e);
2295
2296                         step = sizeof(struct inotify_event) + e->len;
2297                         assert(step <= (size_t) l);
2298
2299                         e = (struct inotify_event*) ((uint8_t*) e + step);
2300                         l -= step;
2301                 }
2302         }
2303 }
2304
2305 _public_ int sd_journal_wait(sd_journal *j, uint64_t timeout_usec) {
2306         int r;
2307         uint64_t t;
2308
2309         assert_return(j, -EINVAL);
2310         assert_return(!journal_pid_changed(j), -ECHILD);
2311
2312         if (j->inotify_fd < 0) {
2313
2314                 /* This is the first invocation, hence create the
2315                  * inotify watch */
2316                 r = sd_journal_get_fd(j);
2317                 if (r < 0)
2318                         return r;
2319
2320                 /* The journal might have changed since the context
2321                  * object was created and we weren't watching before,
2322                  * hence don't wait for anything, and return
2323                  * immediately. */
2324                 return determine_change(j);
2325         }
2326
2327         r = sd_journal_get_timeout(j, &t);
2328         if (r < 0)
2329                 return r;
2330
2331         if (t != (uint64_t) -1) {
2332                 usec_t n;
2333
2334                 n = now(CLOCK_MONOTONIC);
2335                 t = t > n ? t - n : 0;
2336
2337                 if (timeout_usec == (uint64_t) -1 || timeout_usec > t)
2338                         timeout_usec = t;
2339         }
2340
2341         do {
2342                 r = fd_wait_for_event(j->inotify_fd, POLLIN, timeout_usec);
2343         } while (r == -EINTR);
2344
2345         if (r < 0)
2346                 return r;
2347
2348         return sd_journal_process(j);
2349 }
2350
2351 _public_ int sd_journal_get_cutoff_realtime_usec(sd_journal *j, uint64_t *from, uint64_t *to) {
2352         Iterator i;
2353         JournalFile *f;
2354         bool first = true;
2355         uint64_t fmin = 0, tmax = 0;
2356         int r;
2357
2358         assert_return(j, -EINVAL);
2359         assert_return(!journal_pid_changed(j), -ECHILD);
2360         assert_return(from || to, -EINVAL);
2361         assert_return(from != to, -EINVAL);
2362
2363         HASHMAP_FOREACH(f, j->files, i) {
2364                 usec_t fr, t;
2365
2366                 r = journal_file_get_cutoff_realtime_usec(f, &fr, &t);
2367                 if (r == -ENOENT)
2368                         continue;
2369                 if (r < 0)
2370                         return r;
2371                 if (r == 0)
2372                         continue;
2373
2374                 if (first) {
2375                         fmin = fr;
2376                         tmax = t;
2377                         first = false;
2378                 } else {
2379                         fmin = MIN(fr, fmin);
2380                         tmax = MAX(t, tmax);
2381                 }
2382         }
2383
2384         if (from)
2385                 *from = fmin;
2386         if (to)
2387                 *to = tmax;
2388
2389         return first ? 0 : 1;
2390 }
2391
2392 _public_ int sd_journal_get_cutoff_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t *from, uint64_t *to) {
2393         Iterator i;
2394         JournalFile *f;
2395         bool first = true;
2396         int r;
2397
2398         assert_return(j, -EINVAL);
2399         assert_return(!journal_pid_changed(j), -ECHILD);
2400         assert_return(from || to, -EINVAL);
2401         assert_return(from != to, -EINVAL);
2402
2403         HASHMAP_FOREACH(f, j->files, i) {
2404                 usec_t fr, t;
2405
2406                 r = journal_file_get_cutoff_monotonic_usec(f, boot_id, &fr, &t);
2407                 if (r == -ENOENT)
2408                         continue;
2409                 if (r < 0)
2410                         return r;
2411                 if (r == 0)
2412                         continue;
2413
2414                 if (first) {
2415                         if (from)
2416                                 *from = fr;
2417                         if (to)
2418                                 *to = t;
2419                         first = false;
2420                 } else {
2421                         if (from)
2422                                 *from = MIN(fr, *from);
2423                         if (to)
2424                                 *to = MAX(t, *to);
2425                 }
2426         }
2427
2428         return first ? 0 : 1;
2429 }
2430
2431 void journal_print_header(sd_journal *j) {
2432         Iterator i;
2433         JournalFile *f;
2434         bool newline = false;
2435
2436         assert(j);
2437
2438         HASHMAP_FOREACH(f, j->files, i) {
2439                 if (newline)
2440                         putchar('\n');
2441                 else
2442                         newline = true;
2443
2444                 journal_file_print_header(f);
2445         }
2446 }
2447
2448 _public_ int sd_journal_get_usage(sd_journal *j, uint64_t *bytes) {
2449         Iterator i;
2450         JournalFile *f;
2451         uint64_t sum = 0;
2452
2453         assert_return(j, -EINVAL);
2454         assert_return(!journal_pid_changed(j), -ECHILD);
2455         assert_return(bytes, -EINVAL);
2456
2457         HASHMAP_FOREACH(f, j->files, i) {
2458                 struct stat st;
2459
2460                 if (fstat(f->fd, &st) < 0)
2461                         return -errno;
2462
2463                 sum += (uint64_t) st.st_blocks * 512ULL;
2464         }
2465
2466         *bytes = sum;
2467         return 0;
2468 }
2469
2470 _public_ int sd_journal_query_unique(sd_journal *j, const char *field) {
2471         char *f;
2472
2473         assert_return(j, -EINVAL);
2474         assert_return(!journal_pid_changed(j), -ECHILD);
2475         assert_return(!isempty(field), -EINVAL);
2476         assert_return(field_is_valid(field), -EINVAL);
2477
2478         f = strdup(field);
2479         if (!f)
2480                 return -ENOMEM;
2481
2482         free(j->unique_field);
2483         j->unique_field = f;
2484         j->unique_file = NULL;
2485         j->unique_offset = 0;
2486
2487         return 0;
2488 }
2489
2490 _public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l) {
2491         size_t k;
2492
2493         assert_return(j, -EINVAL);
2494         assert_return(!journal_pid_changed(j), -ECHILD);
2495         assert_return(data, -EINVAL);
2496         assert_return(l, -EINVAL);
2497         assert_return(j->unique_field, -EINVAL);
2498
2499         k = strlen(j->unique_field);
2500
2501         if (!j->unique_file) {
2502                 j->unique_file = hashmap_first(j->files);
2503                 if (!j->unique_file)
2504                         return 0;
2505                 j->unique_offset = 0;
2506         }
2507
2508         for (;;) {
2509                 JournalFile *of;
2510                 Iterator i;
2511                 Object *o;
2512                 const void *odata;
2513                 size_t ol;
2514                 bool found;
2515                 int r;
2516
2517                 /* Proceed to next data object in the field's linked list */
2518                 if (j->unique_offset == 0) {
2519                         r = journal_file_find_field_object(j->unique_file, j->unique_field, k, &o, NULL);
2520                         if (r < 0)
2521                                 return r;
2522
2523                         j->unique_offset = r > 0 ? le64toh(o->field.head_data_offset) : 0;
2524                 } else {
2525                         r = journal_file_move_to_object(j->unique_file, OBJECT_DATA, j->unique_offset, &o);
2526                         if (r < 0)
2527                                 return r;
2528
2529                         j->unique_offset = le64toh(o->data.next_field_offset);
2530                 }
2531
2532                 /* We reached the end of the list? Then start again, with the next file */
2533                 if (j->unique_offset == 0) {
2534                         JournalFile *n;
2535
2536                         n = hashmap_next(j->files, j->unique_file->path);
2537                         if (!n)
2538                                 return 0;
2539
2540                         j->unique_file = n;
2541                         continue;
2542                 }
2543
2544                 /* We do not use the type context here, but 0 instead,
2545                  * so that we can look at this data object at the same
2546                  * time as one on another file */
2547                 r = journal_file_move_to_object(j->unique_file, 0, j->unique_offset, &o);
2548                 if (r < 0)
2549                         return r;
2550
2551                 /* Let's do the type check by hand, since we used 0 context above. */
2552                 if (o->object.type != OBJECT_DATA) {
2553                         log_error("%s:offset " OFSfmt ": object has type %d, expected %d",
2554                                   j->unique_file->path, j->unique_offset,
2555                                   o->object.type, OBJECT_DATA);
2556                         return -EBADMSG;
2557                 }
2558
2559                 r = journal_file_object_keep(j->unique_file, o, j->unique_offset);
2560                 if (r < 0)
2561                         return r;
2562
2563                 r = return_data(j, j->unique_file, o, &odata, &ol);
2564                 if (r < 0)
2565                         return r;
2566
2567                 /* OK, now let's see if we already returned this data
2568                  * object by checking if it exists in the earlier
2569                  * traversed files. */
2570                 found = false;
2571                 HASHMAP_FOREACH(of, j->files, i) {
2572                         Object *oo;
2573                         uint64_t op;
2574
2575                         if (of == j->unique_file)
2576                                 break;
2577
2578                         /* Skip this file it didn't have any fields
2579                          * indexed */
2580                         if (JOURNAL_HEADER_CONTAINS(of->header, n_fields) &&
2581                             le64toh(of->header->n_fields) <= 0)
2582                                 continue;
2583
2584                         r = journal_file_find_data_object_with_hash(of, odata, ol, le64toh(o->data.hash), &oo, &op);
2585                         if (r < 0)
2586                                 return r;
2587
2588                         if (r > 0)
2589                                 found = true;
2590                 }
2591
2592                 if (found)
2593                         continue;
2594
2595                 r = journal_file_object_release(j->unique_file, o, j->unique_offset);
2596                 if (r < 0)
2597                         return r;
2598
2599                 r = return_data(j, j->unique_file, o, data, l);
2600                 if (r < 0)
2601                         return r;
2602
2603                 return 1;
2604         }
2605 }
2606
2607 _public_ void sd_journal_restart_unique(sd_journal *j) {
2608         if (!j)
2609                 return;
2610
2611         j->unique_file = NULL;
2612         j->unique_offset = 0;
2613 }
2614
2615 _public_ int sd_journal_reliable_fd(sd_journal *j) {
2616         assert_return(j, -EINVAL);
2617         assert_return(!journal_pid_changed(j), -ECHILD);
2618
2619         return !j->on_network;
2620 }
2621
2622 static char *lookup_field(const char *field, void *userdata) {
2623         sd_journal *j = userdata;
2624         const void *data;
2625         size_t size, d;
2626         int r;
2627
2628         assert(field);
2629         assert(j);
2630
2631         r = sd_journal_get_data(j, field, &data, &size);
2632         if (r < 0 ||
2633             size > REPLACE_VAR_MAX)
2634                 return strdup(field);
2635
2636         d = strlen(field) + 1;
2637
2638         return strndup((const char*) data + d, size - d);
2639 }
2640
2641 _public_ int sd_journal_get_catalog(sd_journal *j, char **ret) {
2642         const void *data;
2643         size_t size;
2644         sd_id128_t id;
2645         _cleanup_free_ char *text = NULL, *cid = NULL;
2646         char *t;
2647         int r;
2648
2649         assert_return(j, -EINVAL);
2650         assert_return(!journal_pid_changed(j), -ECHILD);
2651         assert_return(ret, -EINVAL);
2652
2653         r = sd_journal_get_data(j, "MESSAGE_ID", &data, &size);
2654         if (r < 0)
2655                 return r;
2656
2657         cid = strndup((const char*) data + 11, size - 11);
2658         if (!cid)
2659                 return -ENOMEM;
2660
2661         r = sd_id128_from_string(cid, &id);
2662         if (r < 0)
2663                 return r;
2664
2665         r = catalog_get(CATALOG_DATABASE, id, &text);
2666         if (r < 0)
2667                 return r;
2668
2669         t = replace_var(text, lookup_field, j);
2670         if (!t)
2671                 return -ENOMEM;
2672
2673         *ret = t;
2674         return 0;
2675 }
2676
2677 _public_ int sd_journal_get_catalog_for_message_id(sd_id128_t id, char **ret) {
2678         assert_return(ret, -EINVAL);
2679
2680         return catalog_get(CATALOG_DATABASE, id, ret);
2681 }
2682
2683 _public_ int sd_journal_set_data_threshold(sd_journal *j, size_t sz) {
2684         assert_return(j, -EINVAL);
2685         assert_return(!journal_pid_changed(j), -ECHILD);
2686
2687         j->data_threshold = sz;
2688         return 0;
2689 }
2690
2691 _public_ int sd_journal_get_data_threshold(sd_journal *j, size_t *sz) {
2692         assert_return(j, -EINVAL);
2693         assert_return(!journal_pid_changed(j), -ECHILD);
2694         assert_return(sz, -EINVAL);
2695
2696         *sz = j->data_threshold;
2697         return 0;
2698 }