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
  29 #include "sd-journal.h"
  30 #include "journal-def.h"
  31 #include "journal-file.h"
  32 #include "hashmap.h"
  33 #include "list.h"
  34 #include "path-util.h"
  35 #include "lookup3.h"
  36 #include "compress.h"
  37 #include "journal-internal.h"
  38
  39 #define JOURNAL_FILES_MAX 1024
  40
  41 static void detach_location(sd_journal *j) {
  42         Iterator i;
  43         JournalFile *f;
  44
  45         assert(j);
  46
  47         j->current_file = NULL;
  48         j->current_field = 0;
  49
  50         HASHMAP_FOREACH(f, j->files, i)
  51                 f->current_offset = 0;
  52 }
  53
  54 static void reset_location(sd_journal *j) {
  55         assert(j);
  56
  57         detach_location(j);
  58         zero(j->current_location);
  59 }
  60
  61 static void init_location(Location *l, JournalFile *f, Object *o) {
  62         assert(l);
  63         assert(f);
  64         assert(o->object.type == OBJECT_ENTRY);
  65
  66         l->type = LOCATION_DISCRETE;
  67         l->seqnum = le64toh(o->entry.seqnum);
  68         l->seqnum_id = f->header->seqnum_id;
  69         l->realtime = le64toh(o->entry.realtime);
  70         l->monotonic = le64toh(o->entry.monotonic);
  71         l->boot_id = o->entry.boot_id;
  72         l->xor_hash = le64toh(o->entry.xor_hash);
  73
  74         l->seqnum_set = l->realtime_set = l->monotonic_set = l->xor_hash_set = true;
  75 }
  76
  77 static void set_location(sd_journal *j, JournalFile *f, Object *o, uint64_t offset) {
  78         assert(j);
  79         assert(f);
  80         assert(o);
  81
  82         init_location(&j->current_location, f, o);
  83
  84         j->current_file = f;
  85         j->current_field = 0;
  86
  87         f->current_offset = offset;
  88 }
  89
  90 static int match_is_valid(const void *data, size_t size) {
  91         const char *b, *p;
  92
  93         assert(data);
  94
  95         if (size < 2)
  96                 return false;
  97
  98         if (startswith(data, "__"))
  99                 return false;
 100
 101         b = data;
 102         for (p = b; p < b + size; p++) {
 103
 104                 if (*p == '=')
 105                         return p > b;
 106
 107                 if (*p == '_')
 108                         continue;
 109
 110                 if (*p >= 'A' && *p <= 'Z')
 111                         continue;
 112
 113                 if (*p >= '0' && *p <= '9')
 114                         continue;
 115
 116                 return false;
 117         }
 118
 119         return false;
 120 }
 121
 122 static bool same_field(const void *_a, size_t s, const void *_b, size_t t) {
 123         const uint8_t *a = _a, *b = _b;
 124         size_t j;
 125
 126         for (j = 0; j < s && j < t; j++) {
 127
 128                 if (a[j] != b[j])
 129                         return false;
 130
 131                 if (a[j] == '=')
 132                         return true;
 133         }
 134
 135         return true;
 136 }
 137
 138 static Match *match_new(Match *p, MatchType t) {
 139         Match *m;
 140
 141         m = new0(Match, 1);
 142         if (!m)
 143                 return NULL;
 144
 145         m->type = t;
 146
 147         if (p) {
 148                 m->parent = p;
 149                 LIST_PREPEND(Match, matches, p->matches, m);
 150         }
 151
 152         return m;
 153 }
 154
 155 static void match_free(Match *m) {
 156         assert(m);
 157
 158         while (m->matches)
 159                 match_free(m->matches);
 160
 161         if (m->parent)
 162                 LIST_REMOVE(Match, matches, m->parent->matches, m);
 163
 164         free(m->data);
 165         free(m);
 166 }
 167
 168 static void match_free_if_empty(Match *m) {
 169         assert(m);
 170
 171         if (m->matches)
 172                 return;
 173
 174         match_free(m);
 175 }
 176
 177 _public_ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
 178         Match *l2, *l3, *add_here = NULL, *m;
 179         le64_t le_hash;
 180
 181         if (!j)
 182                 return -EINVAL;
 183
 184         if (!data)
 185                 return -EINVAL;
 186
 187         if (size == 0)
 188                 size = strlen(data);
 189
 190         if (!match_is_valid(data, size))
 191                 return -EINVAL;
 192
 193         /* level 0: OR term
 194          * level 1: AND terms
 195          * level 2: OR terms
 196          * level 3: concrete matches */
 197
 198         if (!j->level0) {
 199                 j->level0 = match_new(NULL, MATCH_OR_TERM);
 200                 if (!j->level0)
 201                         return -ENOMEM;
 202         }
 203
 204         if (!j->level1) {
 205                 j->level1 = match_new(j->level0, MATCH_AND_TERM);
 206                 if (!j->level1)
 207                         return -ENOMEM;
 208         }
 209
 210         assert(j->level0->type == MATCH_OR_TERM);
 211         assert(j->level1->type == MATCH_AND_TERM);
 212
 213         le_hash = htole64(hash64(data, size));
 214
 215         LIST_FOREACH(matches, l2, j->level1->matches) {
 216                 assert(l2->type == MATCH_OR_TERM);
 217
 218                 LIST_FOREACH(matches, l3, l2->matches) {
 219                         assert(l3->type == MATCH_DISCRETE);
 220
 221                         /* Exactly the same match already? Then ignore
 222                          * this addition */
 223                         if (l3->le_hash == le_hash &&
 224                             l3->size == size &&
 225                             memcmp(l3->data, data, size) == 0)
 226                                 return 0;
 227
 228                         /* Same field? Then let's add this to this OR term */
 229                         if (same_field(data, size, l3->data, l3->size)) {
 230                                 add_here = l2;
 231                                 break;
 232                         }
 233                 }
 234
 235                 if (add_here)
 236                         break;
 237         }
 238
 239         if (!add_here) {
 240                 add_here = match_new(j->level1, MATCH_OR_TERM);
 241                 if (!add_here)
 242                         goto fail;
 243         }
 244
 245         m = match_new(add_here, MATCH_DISCRETE);
 246         if (!m)
 247                 goto fail;
 248
 249         m->le_hash = le_hash;
 250         m->size = size;
 251         m->data = memdup(data, size);
 252         if (!m->data)
 253                 goto fail;
 254
 255         detach_location(j);
 256
 257         return 0;
 258
 259 fail:
 260         if (add_here)
 261                 match_free_if_empty(add_here);
 262
 263         if (j->level1)
 264                 match_free_if_empty(j->level1);
 265
 266         if (j->level0)
 267                 match_free_if_empty(j->level0);
 268
 269         return -ENOMEM;
 270 }
 271
 272 _public_ int sd_journal_add_disjunction(sd_journal *j) {
 273         Match *m;
 274
 275         assert(j);
 276
 277         if (!j->level0)
 278                 return 0;
 279
 280         if (!j->level1)
 281                 return 0;
 282
 283         if (!j->level1->matches)
 284                 return 0;
 285
 286         m = match_new(j->level0, MATCH_AND_TERM);
 287         if (!m)
 288                 return -ENOMEM;
 289
 290         j->level1 = m;
 291         return 0;
 292 }
 293
 294 static char *match_make_string(Match *m) {
 295         char *p, *r;
 296         Match *i;
 297         bool enclose = false;
 298
 299         if (!m)
 300                 return strdup("");
 301
 302         if (m->type == MATCH_DISCRETE)
 303                 return strndup(m->data, m->size);
 304
 305         p = NULL;
 306         LIST_FOREACH(matches, i, m->matches) {
 307                 char *t, *k;
 308
 309                 t = match_make_string(i);
 310                 if (!t) {
 311                         free(p);
 312                         return NULL;
 313                 }
 314
 315                 if (p) {
 316                         k = strjoin(p, m->type == MATCH_OR_TERM ? " OR " : " AND ", t, NULL);
 317                         free(p);
 318                         free(t);
 319
 320                         if (!k)
 321                                 return NULL;
 322
 323                         p = k;
 324
 325                         enclose = true;
 326                 } else {
 327                         free(p);
 328                         p = t;
 329                 }
 330         }
 331
 332         if (enclose) {
 333                 r = strjoin("(", p, ")", NULL);
 334                 free(p);
 335                 return r;
 336         }
 337
 338         return p;
 339 }
 340
 341 char *journal_make_match_string(sd_journal *j) {
 342         assert(j);
 343
 344         return match_make_string(j->level0);
 345 }
 346
 347 _public_ void sd_journal_flush_matches(sd_journal *j) {
 348
 349         if (!j)
 350                 return;
 351
 352         if (j->level0)
 353                 match_free(j->level0);
 354
 355         j->level0 = j->level1 = NULL;
 356
 357         detach_location(j);
 358 }
 359
 360 static int compare_order(JournalFile *af, Object *ao,
 361                          JournalFile *bf, Object *bo) {
 362
 363         uint64_t a, b;
 364
 365         assert(af);
 366         assert(ao);
 367         assert(bf);
 368         assert(bo);
 369
 370         /* We operate on two different files here, hence we can access
 371          * two objects at the same time, which we normally can't.
 372          *
 373          * If contents and timestamps match, these entries are
 374          * identical, even if the seqnum does not match */
 375
 376         if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id) &&
 377             ao->entry.monotonic == bo->entry.monotonic &&
 378             ao->entry.realtime == bo->entry.realtime &&
 379             ao->entry.xor_hash == bo->entry.xor_hash)
 380                 return 0;
 381
 382         if (sd_id128_equal(af->header->seqnum_id, bf->header->seqnum_id)) {
 383
 384                 /* If this is from the same seqnum source, compare
 385                  * seqnums */
 386                 a = le64toh(ao->entry.seqnum);
 387                 b = le64toh(bo->entry.seqnum);
 388
 389                 if (a < b)
 390                         return -1;
 391                 if (a > b)
 392                         return 1;
 393
 394                 /* Wow! This is weird, different data but the same
 395                  * seqnums? Something is borked, but let's make the
 396                  * best of it and compare by time. */
 397         }
 398
 399         if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id)) {
 400
 401                 /* If the boot id matches compare monotonic time */
 402                 a = le64toh(ao->entry.monotonic);
 403                 b = le64toh(bo->entry.monotonic);
 404
 405                 if (a < b)
 406                         return -1;
 407                 if (a > b)
 408                         return 1;
 409         }
 410
 411         /* Otherwise compare UTC time */
 412         a = le64toh(ao->entry.realtime);
 413         b = le64toh(bo->entry.realtime);
 414
 415         if (a < b)
 416                 return -1;
 417         if (a > b)
 418                 return 1;
 419
 420         /* Finally, compare by contents */
 421         a = le64toh(ao->entry.xor_hash);
 422         b = le64toh(bo->entry.xor_hash);
 423
 424         if (a < b)
 425                 return -1;
 426         if (a > b)
 427                 return 1;
 428
 429         return 0;
 430 }
 431
 432 static int compare_with_location(JournalFile *af, Object *ao, Location *l) {
 433         uint64_t a;
 434
 435         assert(af);
 436         assert(ao);
 437         assert(l);
 438         assert(l->type == LOCATION_DISCRETE);
 439
 440         if (l->monotonic_set &&
 441             sd_id128_equal(ao->entry.boot_id, l->boot_id) &&
 442             l->realtime_set &&
 443             le64toh(ao->entry.realtime) == l->realtime &&
 444             l->xor_hash_set &&
 445             le64toh(ao->entry.xor_hash) == l->xor_hash)
 446                 return 0;
 447
 448         if (l->seqnum_set &&
 449             sd_id128_equal(af->header->seqnum_id, l->seqnum_id)) {
 450
 451                 a = le64toh(ao->entry.seqnum);
 452
 453                 if (a < l->seqnum)
 454                         return -1;
 455                 if (a > l->seqnum)
 456                         return 1;
 457         }
 458
 459         if (l->monotonic_set &&
 460             sd_id128_equal(ao->entry.boot_id, l->boot_id)) {
 461
 462                 a = le64toh(ao->entry.monotonic);
 463
 464                 if (a < l->monotonic)
 465                         return -1;
 466                 if (a > l->monotonic)
 467                         return 1;
 468         }
 469
 470         if (l->realtime_set) {
 471
 472                 a = le64toh(ao->entry.realtime);
 473
 474                 if (a < l->realtime)
 475                         return -1;
 476                 if (a > l->realtime)
 477                         return 1;
 478         }
 479
 480         if (l->xor_hash_set) {
 481                 a = le64toh(ao->entry.xor_hash);
 482
 483                 if (a < l->xor_hash)
 484                         return -1;
 485                 if (a > l->xor_hash)
 486                         return 1;
 487         }
 488
 489         return 0;
 490 }
 491
 492 static int next_for_match(
 493                 sd_journal *j,
 494                 Match *m,
 495                 JournalFile *f,
 496                 uint64_t after_offset,
 497                 direction_t direction,
 498                 Object **ret,
 499                 uint64_t *offset) {
 500
 501         int r;
 502         uint64_t np = 0;
 503         Object *n;
 504
 505         assert(j);
 506         assert(m);
 507         assert(f);
 508
 509         if (m->type == MATCH_DISCRETE) {
 510                 uint64_t dp;
 511
 512                 r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), NULL, &dp);
 513                 if (r <= 0)
 514                         return r;
 515
 516                 return journal_file_move_to_entry_by_offset_for_data(f, dp, after_offset, direction, ret, offset);
 517
 518         } else if (m->type == MATCH_OR_TERM) {
 519                 Match *i;
 520
 521                 /* Find the earliest match beyond after_offset */
 522
 523                 LIST_FOREACH(matches, i, m->matches) {
 524                         uint64_t cp;
 525
 526                         r = next_for_match(j, i, f, after_offset, direction, NULL, &cp);
 527                         if (r < 0)
 528                                 return r;
 529                         else if (r > 0) {
 530                                 if (np == 0 || (direction == DIRECTION_DOWN ? np > cp : np < cp))
 531                                         np = cp;
 532                         }
 533                 }
 534
 535         } else if (m->type == MATCH_AND_TERM) {
 536                 Match *i;
 537                 bool continue_looking;
 538
 539                 /* Always jump to the next matching entry and repeat
 540                  * this until we fine and offset that matches for all
 541                  * matches. */
 542
 543                 if (!m->matches)
 544                         return 0;
 545
 546                 np = 0;
 547                 do {
 548                         continue_looking = false;
 549
 550                         LIST_FOREACH(matches, i, m->matches) {
 551                                 uint64_t cp, limit;
 552
 553                                 if (np == 0)
 554                                         limit = after_offset;
 555                                 else if (direction == DIRECTION_DOWN)
 556                                         limit = MAX(np, after_offset);
 557                                 else
 558                                         limit = MIN(np, after_offset);
 559
 560                                 r = next_for_match(j, i, f, limit, direction, NULL, &cp);
 561                                 if (r <= 0)
 562                                         return r;
 563
 564                                 if ((direction == DIRECTION_DOWN ? cp >= after_offset : cp <= after_offset) &&
 565                                     (np == 0 || (direction == DIRECTION_DOWN ? cp > np : np < cp))) {
 566                                         np = cp;
 567                                         continue_looking = true;
 568                                 }
 569                         }
 570
 571                 } while (continue_looking);
 572         }
 573
 574         if (np == 0)
 575                 return 0;
 576
 577         r = journal_file_move_to_object(f, OBJECT_ENTRY, np, &n);
 578         if (r < 0)
 579                 return r;
 580
 581         if (ret)
 582                 *ret = n;
 583         if (offset)
 584                 *offset = np;
 585
 586         return 1;
 587 }
 588
 589 static int find_location_for_match(
 590                 sd_journal *j,
 591                 Match *m,
 592                 JournalFile *f,
 593                 direction_t direction,
 594                 Object **ret,
 595                 uint64_t *offset) {
 596
 597         int r;
 598
 599         assert(j);
 600         assert(m);
 601         assert(f);
 602
 603         if (m->type == MATCH_DISCRETE) {
 604                 uint64_t dp;
 605
 606                 r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), NULL, &dp);
 607                 if (r <= 0)
 608                         return r;
 609
 610                 /* FIXME: missing: find by monotonic */
 611
 612                 if (j->current_location.type == LOCATION_HEAD)
 613                         return journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_DOWN, ret, offset);
 614                 if (j->current_location.type == LOCATION_TAIL)
 615                         return journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_UP, ret, offset);
 616                 if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
 617                         return journal_file_move_to_entry_by_seqnum_for_data(f, dp, j->current_location.seqnum, direction, ret, offset);
 618                 if (j->current_location.monotonic_set) {
 619                         r = journal_file_move_to_entry_by_monotonic_for_data(f, dp, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
 620                         if (r != -ENOENT)
 621                                 return r;
 622                 }
 623                 if (j->current_location.realtime_set)
 624                         return journal_file_move_to_entry_by_realtime_for_data(f, dp, j->current_location.realtime, direction, ret, offset);
 625
 626                 return journal_file_next_entry_for_data(f, NULL, 0, dp, direction, ret, offset);
 627
 628         } else if (m->type == MATCH_OR_TERM) {
 629                 uint64_t np = 0;
 630                 Object *n;
 631                 Match *i;
 632
 633                 /* Find the earliest match */
 634
 635                 LIST_FOREACH(matches, i, m->matches) {
 636                         uint64_t cp;
 637
 638                         r = find_location_for_match(j, i, f, direction, NULL, &cp);
 639                         if (r < 0)
 640                                 return r;
 641                         else if (r > 0) {
 642                                 if (np == 0 || (direction == DIRECTION_DOWN ? np > cp : np < cp))
 643                                         np = cp;
 644                         }
 645                 }
 646
 647                 if (np == 0)
 648                         return 0;
 649
 650                 r = journal_file_move_to_object(f, OBJECT_ENTRY, np, &n);
 651                 if (r < 0)
 652                         return r;
 653
 654                 if (ret)
 655                         *ret = n;
 656                 if (offset)
 657                         *offset = np;
 658
 659                 return 1;
 660
 661         } else {
 662                 Match *i;
 663                 uint64_t np = 0;
 664
 665                 assert(m->type == MATCH_AND_TERM);
 666
 667                 /* First jump to the last match, and then find the
 668                  * next one where all matches match */
 669
 670                 if (!m->matches)
 671                         return 0;
 672
 673                 LIST_FOREACH(matches, i, m->matches) {
 674                         uint64_t cp;
 675
 676                         r = find_location_for_match(j, i, f, direction, NULL, &cp);
 677                         if (r <= 0)
 678                                 return r;
 679
 680                         if (np == 0 || (direction == DIRECTION_DOWN ? np < cp : np > cp))
 681                                 np = cp;
 682                 }
 683
 684                 return next_for_match(j, m, f, np, direction, ret, offset);
 685         }
 686 }
 687
 688 static int find_location_with_matches(
 689                 sd_journal *j,
 690                 JournalFile *f,
 691                 direction_t direction,
 692                 Object **ret,
 693                 uint64_t *offset) {
 694
 695         int r;
 696
 697         assert(j);
 698         assert(f);
 699         assert(ret);
 700         assert(offset);
 701
 702         if (!j->level0) {
 703                 /* No matches is simple */
 704
 705                 if (j->current_location.type == LOCATION_HEAD)
 706                         return journal_file_next_entry(f, NULL, 0, DIRECTION_DOWN, ret, offset);
 707                 if (j->current_location.type == LOCATION_TAIL)
 708                         return journal_file_next_entry(f, NULL, 0, DIRECTION_UP, ret, offset);
 709                 if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
 710                         return journal_file_move_to_entry_by_seqnum(f, j->current_location.seqnum, direction, ret, offset);
 711                 if (j->current_location.monotonic_set) {
 712                         r = journal_file_move_to_entry_by_monotonic(f, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
 713                         if (r != -ENOENT)
 714                                 return r;
 715                 }
 716                 if (j->current_location.realtime_set)
 717                         return journal_file_move_to_entry_by_realtime(f, j->current_location.realtime, direction, ret, offset);
 718
 719                 return journal_file_next_entry(f, NULL, 0, direction, ret, offset);
 720         } else
 721                 return find_location_for_match(j, j->level0, f, direction, ret, offset);
 722 }
 723
 724 static int next_with_matches(
 725                 sd_journal *j,
 726                 JournalFile *f,
 727                 direction_t direction,
 728                 Object **ret,
 729                 uint64_t *offset) {
 730
 731         Object *c;
 732         uint64_t cp;
 733
 734         assert(j);
 735         assert(f);
 736         assert(ret);
 737         assert(offset);
 738
 739         c = *ret;
 740         cp = *offset;
 741
 742         /* No matches is easy. We simple advance the file
 743          * pointer by one. */
 744         if (!j->level0)
 745                 return journal_file_next_entry(f, c, cp, direction, ret, offset);
 746
 747         /* If we have a match then we look for the next matching entry
 748          * with an offset at least one step larger */
 749         return next_for_match(j, j->level0, f, direction == DIRECTION_DOWN ? cp+1 : cp-1, direction, ret, offset);
 750 }
 751
 752 static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) {
 753         Object *c;
 754         uint64_t cp;
 755         int r;
 756
 757         assert(j);
 758         assert(f);
 759
 760         if (f->current_offset > 0) {
 761                 cp = f->current_offset;
 762
 763                 r = journal_file_move_to_object(f, OBJECT_ENTRY, cp, &c);
 764                 if (r < 0)
 765                         return r;
 766
 767                 r = next_with_matches(j, f, direction, &c, &cp);
 768                 if (r <= 0)
 769                         return r;
 770         } else {
 771                 r = find_location_with_matches(j, f, direction, &c, &cp);
 772                 if (r <= 0)
 773                         return r;
 774         }
 775
 776         /* OK, we found the spot, now let's advance until to an entry
 777          * that is actually different from what we were previously
 778          * looking at. This is necessary to handle entries which exist
 779          * in two (or more) journal files, and which shall all be
 780          * suppressed but one. */
 781
 782         for (;;) {
 783                 bool found;
 784
 785                 if (j->current_location.type == LOCATION_DISCRETE) {
 786                         int k;
 787
 788                         k = compare_with_location(f, c, &j->current_location);
 789                         if (direction == DIRECTION_DOWN)
 790                                 found = k > 0;
 791                         else
 792                                 found = k < 0;
 793                 } else
 794                         found = true;
 795
 796                 if (found) {
 797                         if (ret)
 798                                 *ret = c;
 799                         if (offset)
 800                                 *offset = cp;
 801                         return 1;
 802                 }
 803
 804                 r = next_with_matches(j, f, direction, &c, &cp);
 805                 if (r <= 0)
 806                         return r;
 807         }
 808 }
 809
 810 static int real_journal_next(sd_journal *j, direction_t direction) {
 811         JournalFile *f, *new_current = NULL;
 812         Iterator i;
 813         int r;
 814         uint64_t new_offset = 0;
 815         Object *new_entry = NULL;
 816
 817         if (!j)
 818                 return -EINVAL;
 819
 820         HASHMAP_FOREACH(f, j->files, i) {
 821                 Object *o;
 822                 uint64_t p;
 823                 bool found;
 824
 825                 r = next_beyond_location(j, f, direction, &o, &p);
 826                 if (r < 0) {
 827                         log_debug("Can't iterate through %s, ignoring: %s", f->path, strerror(-r));
 828                         continue;
 829                 } else if (r == 0)
 830                         continue;
 831
 832                 if (!new_current)
 833                         found = true;
 834                 else {
 835                         int k;
 836
 837                         k = compare_order(f, o, new_current, new_entry);
 838
 839                         if (direction == DIRECTION_DOWN)
 840                                 found = k < 0;
 841                         else
 842                                 found = k > 0;
 843                 }
 844
 845                 if (found) {
 846                         new_current = f;
 847                         new_entry = o;
 848                         new_offset = p;
 849                 }
 850         }
 851
 852         if (!new_current)
 853                 return 0;
 854
 855         set_location(j, new_current, new_entry, new_offset);
 856
 857         return 1;
 858 }
 859
 860 _public_ int sd_journal_next(sd_journal *j) {
 861         return real_journal_next(j, DIRECTION_DOWN);
 862 }
 863
 864 _public_ int sd_journal_previous(sd_journal *j) {
 865         return real_journal_next(j, DIRECTION_UP);
 866 }
 867
 868 static int real_journal_next_skip(sd_journal *j, direction_t direction, uint64_t skip) {
 869         int c = 0, r;
 870
 871         if (!j)
 872                 return -EINVAL;
 873
 874         if (skip == 0) {
 875                 /* If this is not a discrete skip, then at least
 876                  * resolve the current location */
 877                 if (j->current_location.type != LOCATION_DISCRETE)
 878                         return real_journal_next(j, direction);
 879
 880                 return 0;
 881         }
 882
 883         do {
 884                 r = real_journal_next(j, direction);
 885                 if (r < 0)
 886                         return r;
 887
 888                 if (r == 0)
 889                         return c;
 890
 891                 skip--;
 892                 c++;
 893         } while (skip > 0);
 894
 895         return c;
 896 }
 897
 898 _public_ int sd_journal_next_skip(sd_journal *j, uint64_t skip) {
 899         return real_journal_next_skip(j, DIRECTION_DOWN, skip);
 900 }
 901
 902 _public_ int sd_journal_previous_skip(sd_journal *j, uint64_t skip) {
 903         return real_journal_next_skip(j, DIRECTION_UP, skip);
 904 }
 905
 906 _public_ int sd_journal_get_cursor(sd_journal *j, char **cursor) {
 907         Object *o;
 908         int r;
 909         char bid[33], sid[33];
 910
 911         if (!j)
 912                 return -EINVAL;
 913         if (!cursor)
 914                 return -EINVAL;
 915
 916         if (!j->current_file || j->current_file->current_offset <= 0)
 917                 return -EADDRNOTAVAIL;
 918
 919         r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
 920         if (r < 0)
 921                 return r;
 922
 923         sd_id128_to_string(j->current_file->header->seqnum_id, sid);
 924         sd_id128_to_string(o->entry.boot_id, bid);
 925
 926         if (asprintf(cursor,
 927                      "s=%s;i=%llx;b=%s;m=%llx;t=%llx;x=%llx;p=%s",
 928                      sid, (unsigned long long) le64toh(o->entry.seqnum),
 929                      bid, (unsigned long long) le64toh(o->entry.monotonic),
 930                      (unsigned long long) le64toh(o->entry.realtime),
 931                      (unsigned long long) le64toh(o->entry.xor_hash),
 932                      path_get_file_name(j->current_file->path)) < 0)
 933                 return -ENOMEM;
 934
 935         return 1;
 936 }
 937
 938 _public_ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
 939         char *w;
 940         size_t l;
 941         char *state;
 942         unsigned long long seqnum, monotonic, realtime, xor_hash;
 943         bool
 944                 seqnum_id_set = false,
 945                 seqnum_set = false,
 946                 boot_id_set = false,
 947                 monotonic_set = false,
 948                 realtime_set = false,
 949                 xor_hash_set = false;
 950         sd_id128_t seqnum_id, boot_id;
 951
 952         if (!j)
 953                 return -EINVAL;
 954         if (!cursor)
 955                 return -EINVAL;
 956
 957         FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
 958                 char *item;
 959                 int k = 0;
 960
 961                 if (l < 2 || w[1] != '=')
 962                         return -EINVAL;
 963
 964                 item = strndup(w, l);
 965                 if (!item)
 966                         return -ENOMEM;
 967
 968                 switch (w[0]) {
 969
 970                 case 's':
 971                         seqnum_id_set = true;
 972                         k = sd_id128_from_string(w+2, &seqnum_id);
 973                         break;
 974
 975                 case 'i':
 976                         seqnum_set = true;
 977                         if (sscanf(w+2, "%llx", &seqnum) != 1)
 978                                 k = -EINVAL;
 979                         break;
 980
 981                 case 'b':
 982                         boot_id_set = true;
 983                         k = sd_id128_from_string(w+2, &boot_id);
 984                         break;
 985
 986                 case 'm':
 987                         monotonic_set = true;
 988                         if (sscanf(w+2, "%llx", &monotonic) != 1)
 989                                 k = -EINVAL;
 990                         break;
 991
 992                 case 't':
 993                         realtime_set = true;
 994                         if (sscanf(w+2, "%llx", &realtime) != 1)
 995                                 k = -EINVAL;
 996                         break;
 997
 998                 case 'x':
 999                         xor_hash_set = true;
1000                         if (sscanf(w+2, "%llx", &xor_hash) != 1)
1001                                 k = -EINVAL;
1002                         break;
1003                 }
1004
1005                 free(item);
1006
1007                 if (k < 0)
1008                         return k;
1009         }
1010
1011         if ((!seqnum_set || !seqnum_id_set) &&
1012             (!monotonic_set || !boot_id_set) &&
1013             !realtime_set)
1014                 return -EINVAL;
1015
1016         reset_location(j);
1017
1018         j->current_location.type = LOCATION_DISCRETE;
1019
1020         if (realtime_set) {
1021                 j->current_location.realtime = (uint64_t) realtime;
1022                 j->current_location.realtime_set = true;
1023         }
1024
1025         if (seqnum_set && seqnum_id_set) {
1026                 j->current_location.seqnum = (uint64_t) seqnum;
1027                 j->current_location.seqnum_id = seqnum_id;
1028                 j->current_location.seqnum_set = true;
1029         }
1030
1031         if (monotonic_set && boot_id_set) {
1032                 j->current_location.monotonic = (uint64_t) monotonic;
1033                 j->current_location.boot_id = boot_id;
1034                 j->current_location.monotonic_set = true;
1035         }
1036
1037         if (xor_hash_set) {
1038                 j->current_location.xor_hash = (uint64_t) xor_hash;
1039                 j->current_location.xor_hash_set = true;
1040         }
1041
1042         return 0;
1043 }
1044
1045 _public_ int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t usec) {
1046         if (!j)
1047                 return -EINVAL;
1048
1049         reset_location(j);
1050         j->current_location.type = LOCATION_DISCRETE;
1051         j->current_location.boot_id = boot_id;
1052         j->current_location.monotonic = usec;
1053         j->current_location.monotonic_set = true;
1054
1055         return 0;
1056 }
1057
1058 _public_ int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec) {
1059         if (!j)
1060                 return -EINVAL;
1061
1062         reset_location(j);
1063         j->current_location.type = LOCATION_DISCRETE;
1064         j->current_location.realtime = usec;
1065         j->current_location.realtime_set = true;
1066
1067         return 0;
1068 }
1069
1070 _public_ int sd_journal_seek_head(sd_journal *j) {
1071         if (!j)
1072                 return -EINVAL;
1073
1074         reset_location(j);
1075         j->current_location.type = LOCATION_HEAD;
1076
1077         return 0;
1078 }
1079
1080 _public_ int sd_journal_seek_tail(sd_journal *j) {
1081         if (!j)
1082                 return -EINVAL;
1083
1084         reset_location(j);
1085         j->current_location.type = LOCATION_TAIL;
1086
1087         return 0;
1088 }
1089
1090 static int add_file(sd_journal *j, const char *prefix, const char *filename) {
1091         char *path;
1092         int r;
1093         JournalFile *f;
1094
1095         assert(j);
1096         assert(prefix);
1097         assert(filename);
1098
1099         if ((j->flags & SD_JOURNAL_SYSTEM_ONLY) &&
1100             !(streq(filename, "system.journal") ||
1101               streq(filename, "system.journal~") ||
1102               (startswith(filename, "system@") &&
1103                (endswith(filename, ".journal") || endswith(filename, ".journal~")))))
1104                 return 0;
1105
1106         path = strjoin(prefix, "/", filename, NULL);
1107         if (!path)
1108                 return -ENOMEM;
1109
1110         if (hashmap_get(j->files, path)) {
1111                 free(path);
1112                 return 0;
1113         }
1114
1115         if (hashmap_size(j->files) >= JOURNAL_FILES_MAX) {
1116                 log_debug("Too many open journal files, not adding %s, ignoring.", path);
1117                 free(path);
1118                 return 0;
1119         }
1120
1121         r = journal_file_open(path, O_RDONLY, 0, false, false, NULL, j->mmap, NULL, &f);
1122         free(path);
1123
1124         if (r < 0) {
1125                 if (errno == ENOENT)
1126                         return 0;
1127
1128                 return r;
1129         }
1130
1131         /* journal_file_dump(f); */
1132
1133         r = hashmap_put(j->files, f->path, f);
1134         if (r < 0) {
1135                 journal_file_close(f);
1136                 return r;
1137         }
1138
1139         j->current_invalidate_counter ++;
1140
1141         log_debug("File %s got added.", f->path);
1142
1143         return 0;
1144 }
1145
1146 static int remove_file(sd_journal *j, const char *prefix, const char *filename) {
1147         char *path;
1148         JournalFile *f;
1149
1150         assert(j);
1151         assert(prefix);
1152         assert(filename);
1153
1154         path = strjoin(prefix, "/", filename, NULL);
1155         if (!path)
1156                 return -ENOMEM;
1157
1158         f = hashmap_get(j->files, path);
1159         free(path);
1160         if (!f)
1161                 return 0;
1162
1163         hashmap_remove(j->files, f->path);
1164         journal_file_close(f);
1165
1166         j->current_invalidate_counter ++;
1167
1168         log_debug("File %s got removed.", f->path);
1169         return 0;
1170 }
1171
1172 static int add_directory(sd_journal *j, const char *prefix, const char *dirname) {
1173         char *path;
1174         int r;
1175         DIR *d;
1176         sd_id128_t id, mid;
1177         Directory *m;
1178
1179         assert(j);
1180         assert(prefix);
1181         assert(dirname);
1182
1183         if ((j->flags & SD_JOURNAL_LOCAL_ONLY) &&
1184             (sd_id128_from_string(dirname, &id) < 0 ||
1185              sd_id128_get_machine(&mid) < 0 ||
1186              !sd_id128_equal(id, mid)))
1187             return 0;
1188
1189         path = strjoin(prefix, "/", dirname, NULL);
1190         if (!path)
1191                 return -ENOMEM;
1192
1193         d = opendir(path);
1194         if (!d) {
1195                 log_debug("Failed to open %s: %m", path);
1196                 free(path);
1197
1198                 if (errno == ENOENT)
1199                         return 0;
1200                 return -errno;
1201         }
1202
1203         m = hashmap_get(j->directories_by_path, path);
1204         if (!m) {
1205                 m = new0(Directory, 1);
1206                 if (!m) {
1207                         closedir(d);
1208                         free(path);
1209                         return -ENOMEM;
1210                 }
1211
1212                 m->is_root = false;
1213                 m->path = path;
1214
1215                 if (hashmap_put(j->directories_by_path, m->path, m) < 0) {
1216                         closedir(d);
1217                         free(m->path);
1218                         free(m);
1219                         return -ENOMEM;
1220                 }
1221
1222                 j->current_invalidate_counter ++;
1223
1224                 log_debug("Directory %s got added.", m->path);
1225
1226         } else if (m->is_root) {
1227                 free (path);
1228                 closedir(d);
1229                 return 0;
1230         }  else
1231                 free(path);
1232
1233         if (m->wd <= 0 && j->inotify_fd >= 0) {
1234
1235                 m->wd = inotify_add_watch(j->inotify_fd, m->path,
1236                                           IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
1237                                           IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|
1238                                           IN_ONLYDIR);
1239
1240                 if (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0)
1241                         inotify_rm_watch(j->inotify_fd, m->wd);
1242         }
1243
1244         for (;;) {
1245                 struct dirent buf, *de;
1246
1247                 r = readdir_r(d, &buf, &de);
1248                 if (r != 0 || !de)
1249                         break;
1250
1251                 if (dirent_is_file_with_suffix(de, ".journal") ||
1252                     dirent_is_file_with_suffix(de, ".journal~")) {
1253                         r = add_file(j, m->path, de->d_name);
1254                         if (r < 0)
1255                                 log_debug("Failed to add file %s/%s: %s", m->path, de->d_name, strerror(-r));
1256                 }
1257         }
1258
1259         closedir(d);
1260
1261         return 0;
1262 }
1263
1264 static int add_root_directory(sd_journal *j, const char *p) {
1265         DIR *d;
1266         Directory *m;
1267         int r;
1268
1269         assert(j);
1270         assert(p);
1271
1272         if ((j->flags & SD_JOURNAL_RUNTIME_ONLY) &&
1273             !path_startswith(p, "/run"))
1274                 return -EINVAL;
1275
1276         d = opendir(p);
1277         if (!d)
1278                 return -errno;
1279
1280         m = hashmap_get(j->directories_by_path, p);
1281         if (!m) {
1282                 m = new0(Directory, 1);
1283                 if (!m) {
1284                         closedir(d);
1285                         return -ENOMEM;
1286                 }
1287
1288                 m->is_root = true;
1289                 m->path = strdup(p);
1290                 if (!m->path) {
1291                         closedir(d);
1292                         free(m);
1293                         return -ENOMEM;
1294                 }
1295
1296                 if (hashmap_put(j->directories_by_path, m->path, m) < 0) {
1297                         closedir(d);
1298                         free(m->path);
1299                         free(m);
1300                         return -ENOMEM;
1301                 }
1302
1303                 j->current_invalidate_counter ++;
1304
1305                 log_debug("Root directory %s got added.", m->path);
1306
1307         } else if (!m->is_root) {
1308                 closedir(d);
1309                 return 0;
1310         }
1311
1312         if (m->wd <= 0 && j->inotify_fd >= 0) {
1313
1314                 m->wd = inotify_add_watch(j->inotify_fd, m->path,
1315                                           IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
1316                                           IN_ONLYDIR);
1317
1318                 if (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0)
1319                         inotify_rm_watch(j->inotify_fd, m->wd);
1320         }
1321
1322         for (;;) {
1323                 struct dirent buf, *de;
1324                 sd_id128_t id;
1325
1326                 r = readdir_r(d, &buf, &de);
1327                 if (r != 0 || !de)
1328                         break;
1329
1330                 if (dirent_is_file_with_suffix(de, ".journal") ||
1331                     dirent_is_file_with_suffix(de, ".journal~")) {
1332                         r = add_file(j, m->path, de->d_name);
1333                         if (r < 0)
1334                                 log_debug("Failed to add file %s/%s: %s", m->path, de->d_name, strerror(-r));
1335
1336                 } else if ((de->d_type == DT_DIR || de->d_type == DT_LNK || de->d_type == DT_UNKNOWN) &&
1337                            sd_id128_from_string(de->d_name, &id) >= 0) {
1338
1339                         r = add_directory(j, m->path, de->d_name);
1340                         if (r < 0)
1341                                 log_debug("Failed to add directory %s/%s: %s", m->path, de->d_name, strerror(-r));
1342                 }
1343         }
1344
1345         closedir(d);
1346
1347         return 0;
1348 }
1349
1350 static int remove_directory(sd_journal *j, Directory *d) {
1351         assert(j);
1352
1353         if (d->wd > 0) {
1354                 hashmap_remove(j->directories_by_wd, INT_TO_PTR(d->wd));
1355
1356                 if (j->inotify_fd >= 0)
1357                         inotify_rm_watch(j->inotify_fd, d->wd);
1358         }
1359
1360         hashmap_remove(j->directories_by_path, d->path);
1361
1362         if (d->is_root)
1363                 log_debug("Root directory %s got removed.", d->path);
1364         else
1365                 log_debug("Directory %s got removed.", d->path);
1366
1367         free(d->path);
1368         free(d);
1369
1370         return 0;
1371 }
1372
1373 static int add_search_paths(sd_journal *j) {
1374
1375         const char search_paths[] =
1376                 "/run/log/journal\0"
1377                 "/var/log/journal\0";
1378         const char *p;
1379
1380         assert(j);
1381
1382         /* We ignore most errors here, since the idea is to only open
1383          * what's actually accessible, and ignore the rest. */
1384
1385         NULSTR_FOREACH(p, search_paths)
1386                 add_root_directory(j, p);
1387
1388         return 0;
1389 }
1390
1391 static int allocate_inotify(sd_journal *j) {
1392         assert(j);
1393
1394         if (j->inotify_fd < 0) {
1395                 j->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
1396                 if (j->inotify_fd < 0)
1397                         return -errno;
1398         }
1399
1400         if (!j->directories_by_wd) {
1401                 j->directories_by_wd = hashmap_new(trivial_hash_func, trivial_compare_func);
1402                 if (!j->directories_by_wd)
1403                         return -ENOMEM;
1404         }
1405
1406         return 0;
1407 }
1408
1409 static sd_journal *journal_new(int flags, const char *path) {
1410         sd_journal *j;
1411
1412         j = new0(sd_journal, 1);
1413         if (!j)
1414                 return NULL;
1415
1416         j->inotify_fd = -1;
1417         j->flags = flags;
1418
1419         if (path) {
1420                 j->path = strdup(path);
1421                 if (!j->path) {
1422                         free(j);
1423                         return NULL;
1424                 }
1425         }
1426
1427         j->files = hashmap_new(string_hash_func, string_compare_func);
1428         if (!j->files) {
1429                 free(j->path);
1430                 free(j);
1431                 return NULL;
1432         }
1433
1434         j->directories_by_path = hashmap_new(string_hash_func, string_compare_func);
1435         if (!j->directories_by_path) {
1436                 hashmap_free(j->files);
1437                 free(j->path);
1438                 free(j);
1439                 return NULL;
1440         }
1441
1442         j->mmap = mmap_cache_new();
1443         if (!j->mmap) {
1444                 hashmap_free(j->files);
1445                 hashmap_free(j->directories_by_path);
1446                 free(j->path);
1447                 free(j);
1448         }
1449
1450         return j;
1451 }
1452
1453 _public_ int sd_journal_open(sd_journal **ret, int flags) {
1454         sd_journal *j;
1455         int r;
1456
1457         if (!ret)
1458                 return -EINVAL;
1459
1460         if (flags & ~(SD_JOURNAL_LOCAL_ONLY|
1461                       SD_JOURNAL_RUNTIME_ONLY|
1462                       SD_JOURNAL_SYSTEM_ONLY))
1463                 return -EINVAL;
1464
1465         j = journal_new(flags, NULL);
1466         if (!j)
1467                 return -ENOMEM;
1468
1469         r = add_search_paths(j);
1470         if (r < 0)
1471                 goto fail;
1472
1473         *ret = j;
1474         return 0;
1475
1476 fail:
1477         sd_journal_close(j);
1478
1479         return r;
1480 }
1481
1482 _public_ int sd_journal_open_directory(sd_journal **ret, const char *path, int flags) {
1483         sd_journal *j;
1484         int r;
1485
1486         if (!ret)
1487                 return -EINVAL;
1488
1489         if (!path || !path_is_absolute(path))
1490                 return -EINVAL;
1491
1492         if (flags != 0)
1493                 return -EINVAL;
1494
1495         j = journal_new(flags, path);
1496         if (!j)
1497                 return -ENOMEM;
1498
1499         r = add_root_directory(j, path);
1500         if (r < 0)
1501                 goto fail;
1502
1503         *ret = j;
1504         return 0;
1505
1506 fail:
1507         sd_journal_close(j);
1508
1509         return r;
1510 }
1511
1512 _public_ void sd_journal_close(sd_journal *j) {
1513         Directory *d;
1514         JournalFile *f;
1515
1516         if (!j)
1517                 return;
1518
1519         while ((f = hashmap_steal_first(j->files)))
1520                 journal_file_close(f);
1521
1522         hashmap_free(j->files);
1523
1524         while ((d = hashmap_first(j->directories_by_path)))
1525                 remove_directory(j, d);
1526
1527         while ((d = hashmap_first(j->directories_by_wd)))
1528                 remove_directory(j, d);
1529
1530         hashmap_free(j->directories_by_path);
1531         hashmap_free(j->directories_by_wd);
1532
1533         if (j->inotify_fd >= 0)
1534                 close_nointr_nofail(j->inotify_fd);
1535
1536         sd_journal_flush_matches(j);
1537
1538         if (j->mmap)
1539                 mmap_cache_unref(j->mmap);
1540
1541         free(j->path);
1542         free(j);
1543 }
1544
1545 _public_ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
1546         Object *o;
1547         JournalFile *f;
1548         int r;
1549
1550         if (!j)
1551                 return -EINVAL;
1552         if (!ret)
1553                 return -EINVAL;
1554
1555         f = j->current_file;
1556         if (!f)
1557                 return -EADDRNOTAVAIL;
1558
1559         if (f->current_offset <= 0)
1560                 return -EADDRNOTAVAIL;
1561
1562         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1563         if (r < 0)
1564                 return r;
1565
1566         *ret = le64toh(o->entry.realtime);
1567         return 0;
1568 }
1569
1570 _public_ int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *ret, sd_id128_t *ret_boot_id) {
1571         Object *o;
1572         JournalFile *f;
1573         int r;
1574         sd_id128_t id;
1575
1576         if (!j)
1577                 return -EINVAL;
1578
1579         f = j->current_file;
1580         if (!f)
1581                 return -EADDRNOTAVAIL;
1582
1583         if (f->current_offset <= 0)
1584                 return -EADDRNOTAVAIL;
1585
1586         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1587         if (r < 0)
1588                 return r;
1589
1590         if (ret_boot_id)
1591                 *ret_boot_id = o->entry.boot_id;
1592         else {
1593                 r = sd_id128_get_boot(&id);
1594                 if (r < 0)
1595                         return r;
1596
1597                 if (!sd_id128_equal(id, o->entry.boot_id))
1598                         return -ESTALE;
1599         }
1600
1601         if (ret)
1602                 *ret = le64toh(o->entry.monotonic);
1603
1604         return 0;
1605 }
1606
1607 static bool field_is_valid(const char *field) {
1608         const char *p;
1609
1610         assert(field);
1611
1612         if (isempty(field))
1613                 return false;
1614
1615         if (startswith(field, "__"))
1616                 return false;
1617
1618         for (p = field; *p; p++) {
1619
1620                 if (*p == '_')
1621                         continue;
1622
1623                 if (*p >= 'A' && *p <= 'Z')
1624                         continue;
1625
1626                 if (*p >= '0' && *p <= '9')
1627                         continue;
1628
1629                 return false;
1630         }
1631
1632         return true;
1633 }
1634
1635 _public_ int sd_journal_get_data(sd_journal *j, const char *field, const void **data, size_t *size) {
1636         JournalFile *f;
1637         uint64_t i, n;
1638         size_t field_length;
1639         int r;
1640         Object *o;
1641
1642         if (!j)
1643                 return -EINVAL;
1644         if (!field)
1645                 return -EINVAL;
1646         if (!data)
1647                 return -EINVAL;
1648         if (!size)
1649                 return -EINVAL;
1650
1651         if (!field_is_valid(field))
1652                 return -EINVAL;
1653
1654         f = j->current_file;
1655         if (!f)
1656                 return -EADDRNOTAVAIL;
1657
1658         if (f->current_offset <= 0)
1659                 return -EADDRNOTAVAIL;
1660
1661         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1662         if (r < 0)
1663                 return r;
1664
1665         field_length = strlen(field);
1666
1667         n = journal_file_entry_n_items(o);
1668         for (i = 0; i < n; i++) {
1669                 uint64_t p, l;
1670                 le64_t le_hash;
1671                 size_t t;
1672
1673                 p = le64toh(o->entry.items[i].object_offset);
1674                 le_hash = o->entry.items[i].hash;
1675                 r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
1676                 if (r < 0)
1677                         return r;
1678
1679                 if (le_hash != o->data.hash)
1680                         return -EBADMSG;
1681
1682                 l = le64toh(o->object.size) - offsetof(Object, data.payload);
1683
1684                 if (o->object.flags & OBJECT_COMPRESSED) {
1685
1686 #ifdef HAVE_XZ
1687                         if (uncompress_startswith(o->data.payload, l,
1688                                                   &f->compress_buffer, &f->compress_buffer_size,
1689                                                   field, field_length, '=')) {
1690
1691                                 uint64_t rsize;
1692
1693                                 if (!uncompress_blob(o->data.payload, l,
1694                                                      &f->compress_buffer, &f->compress_buffer_size, &rsize))
1695                                         return -EBADMSG;
1696
1697                                 *data = f->compress_buffer;
1698                                 *size = (size_t) rsize;
1699
1700                                 return 0;
1701                         }
1702 #else
1703                         return -EPROTONOSUPPORT;
1704 #endif
1705
1706                 } else if (l >= field_length+1 &&
1707                            memcmp(o->data.payload, field, field_length) == 0 &&
1708                            o->data.payload[field_length] == '=') {
1709
1710                         t = (size_t) l;
1711
1712                         if ((uint64_t) t != l)
1713                                 return -E2BIG;
1714
1715                         *data = o->data.payload;
1716                         *size = t;
1717
1718                         return 0;
1719                 }
1720
1721                 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1722                 if (r < 0)
1723                         return r;
1724         }
1725
1726         return -ENOENT;
1727 }
1728
1729 _public_ int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) {
1730         JournalFile *f;
1731         uint64_t p, l, n;
1732         le64_t le_hash;
1733         int r;
1734         Object *o;
1735         size_t t;
1736
1737         if (!j)
1738                 return -EINVAL;
1739         if (!data)
1740                 return -EINVAL;
1741         if (!size)
1742                 return -EINVAL;
1743
1744         f = j->current_file;
1745         if (!f)
1746                 return -EADDRNOTAVAIL;
1747
1748         if (f->current_offset <= 0)
1749                 return -EADDRNOTAVAIL;
1750
1751         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1752         if (r < 0)
1753                 return r;
1754
1755         n = journal_file_entry_n_items(o);
1756         if (j->current_field >= n)
1757                 return 0;
1758
1759         p = le64toh(o->entry.items[j->current_field].object_offset);
1760         le_hash = o->entry.items[j->current_field].hash;
1761         r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
1762         if (r < 0)
1763                 return r;
1764
1765         if (le_hash != o->data.hash)
1766                 return -EBADMSG;
1767
1768         l = le64toh(o->object.size) - offsetof(Object, data.payload);
1769         t = (size_t) l;
1770
1771         /* We can't read objects larger than 4G on a 32bit machine */
1772         if ((uint64_t) t != l)
1773                 return -E2BIG;
1774
1775         if (o->object.flags & OBJECT_COMPRESSED) {
1776 #ifdef HAVE_XZ
1777                 uint64_t rsize;
1778
1779                 if (!uncompress_blob(o->data.payload, l, &f->compress_buffer, &f->compress_buffer_size, &rsize))
1780                         return -EBADMSG;
1781
1782                 *data = f->compress_buffer;
1783                 *size = (size_t) rsize;
1784 #else
1785                 return -EPROTONOSUPPORT;
1786 #endif
1787         } else {
1788                 *data = o->data.payload;
1789                 *size = t;
1790         }
1791
1792         j->current_field ++;
1793
1794         return 1;
1795 }
1796
1797 _public_ void sd_journal_restart_data(sd_journal *j) {
1798         if (!j)
1799                 return;
1800
1801         j->current_field = 0;
1802 }
1803
1804 _public_ int sd_journal_get_fd(sd_journal *j) {
1805         int r;
1806
1807         if (!j)
1808                 return -EINVAL;
1809
1810         if (j->inotify_fd >= 0)
1811                 return j->inotify_fd;
1812
1813         r = allocate_inotify(j);
1814         if (r < 0)
1815                 return r;
1816
1817         /* Iterate through all dirs again, to add them to the
1818          * inotify */
1819         if (j->path)
1820                 r = add_root_directory(j, j->path);
1821         else
1822                 r = add_search_paths(j);
1823         if (r < 0)
1824                 return r;
1825
1826         return j->inotify_fd;
1827 }
1828
1829 static void process_inotify_event(sd_journal *j, struct inotify_event *e) {
1830         Directory *d;
1831         int r;
1832
1833         assert(j);
1834         assert(e);
1835
1836         /* Is this a subdirectory we watch? */
1837         d = hashmap_get(j->directories_by_wd, INT_TO_PTR(e->wd));
1838         if (d) {
1839                 sd_id128_t id;
1840
1841                 if (!(e->mask & IN_ISDIR) && e->len > 0 &&
1842                     (endswith(e->name, ".journal") ||
1843                      endswith(e->name, ".journal~"))) {
1844
1845                         /* Event for a journal file */
1846
1847                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
1848                                 r = add_file(j, d->path, e->name);
1849                                 if (r < 0)
1850                                         log_debug("Failed to add file %s/%s: %s", d->path, e->name, strerror(-r));
1851
1852                         } else if (e->mask & (IN_DELETE|IN_UNMOUNT)) {
1853
1854                                 r = remove_file(j, d->path, e->name);
1855                                 if (r < 0)
1856                                         log_debug("Failed to remove file %s/%s: %s", d->path, e->name, strerror(-r));
1857                         }
1858
1859                 } else if (!d->is_root && e->len == 0) {
1860
1861                         /* Event for a subdirectory */
1862
1863                         if (e->mask & (IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT)) {
1864                                 r = remove_directory(j, d);
1865                                 if (r < 0)
1866                                         log_debug("Failed to remove directory %s: %s", d->path, strerror(-r));
1867                         }
1868
1869
1870                 } else if (d->is_root && (e->mask & IN_ISDIR) && e->len > 0 && sd_id128_from_string(e->name, &id) >= 0) {
1871
1872                         /* Event for root directory */
1873
1874                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
1875                                 r = add_directory(j, d->path, e->name);
1876                                 if (r < 0)
1877                                         log_debug("Failed to add directory %s/%s: %s", d->path, e->name, strerror(-r));
1878                         }
1879                 }
1880
1881                 return;
1882         }
1883
1884         if (e->mask & IN_IGNORED)
1885                 return;
1886
1887         log_warning("Unknown inotify event.");
1888 }
1889
1890 static int determine_change(sd_journal *j) {
1891         bool b;
1892
1893         assert(j);
1894
1895         b = j->current_invalidate_counter != j->last_invalidate_counter;
1896         j->last_invalidate_counter = j->current_invalidate_counter;
1897
1898         return b ? SD_JOURNAL_INVALIDATE : SD_JOURNAL_APPEND;
1899 }
1900
1901 _public_ int sd_journal_process(sd_journal *j) {
1902         uint8_t buffer[sizeof(struct inotify_event) + FILENAME_MAX] _alignas_(struct inotify_event);
1903         bool got_something = false;
1904
1905         if (!j)
1906                 return -EINVAL;
1907
1908         for (;;) {
1909                 struct inotify_event *e;
1910                 ssize_t l;
1911
1912                 l = read(j->inotify_fd, buffer, sizeof(buffer));
1913                 if (l < 0) {
1914                         if (errno == EAGAIN || errno == EINTR)
1915                                 return got_something ? determine_change(j) : SD_JOURNAL_NOP;
1916
1917                         return -errno;
1918                 }
1919
1920                 got_something = true;
1921
1922                 e = (struct inotify_event*) buffer;
1923                 while (l > 0) {
1924                         size_t step;
1925
1926                         process_inotify_event(j, e);
1927
1928                         step = sizeof(struct inotify_event) + e->len;
1929                         assert(step <= (size_t) l);
1930
1931                         e = (struct inotify_event*) ((uint8_t*) e + step);
1932                         l -= step;
1933                 }
1934         }
1935
1936         return determine_change(j);
1937 }
1938
1939 _public_ int sd_journal_wait(sd_journal *j, uint64_t timeout_usec) {
1940         int r;
1941
1942         assert(j);
1943
1944         if (j->inotify_fd < 0) {
1945
1946                 /* This is the first invocation, hence create the
1947                  * inotify watch */
1948                 r = sd_journal_get_fd(j);
1949                 if (r < 0)
1950                         return r;
1951
1952                 /* The journal might have changed since the context
1953                  * object was created and we weren't watching before,
1954                  * hence don't wait for anything, and return
1955                  * immediately. */
1956                 return determine_change(j);
1957         }
1958
1959         do {
1960                 r = fd_wait_for_event(j->inotify_fd, POLLIN, timeout_usec);
1961         } while (r == -EINTR);
1962
1963         if (r < 0)
1964                 return r;
1965
1966         return sd_journal_process(j);
1967 }
1968
1969 _public_ int sd_journal_get_cutoff_realtime_usec(sd_journal *j, uint64_t *from, uint64_t *to) {
1970         Iterator i;
1971         JournalFile *f;
1972         bool first = true;
1973         int r;
1974
1975         if (!j)
1976                 return -EINVAL;
1977         if (!from && !to)
1978                 return -EINVAL;
1979
1980         HASHMAP_FOREACH(f, j->files, i) {
1981                 usec_t fr, t;
1982
1983                 r = journal_file_get_cutoff_realtime_usec(f, &fr, &t);
1984                 if (r == -ENOENT)
1985                         continue;
1986                 if (r < 0)
1987                         return r;
1988                 if (r == 0)
1989                         continue;
1990
1991                 if (first) {
1992                         if (from)
1993                                 *from = fr;
1994                         if (to)
1995                                 *to = t;
1996                         first = false;
1997                 } else {
1998                         if (from)
1999                                 *from = MIN(fr, *from);
2000                         if (to)
2001                                 *to = MIN(t, *to);
2002                 }
2003         }
2004
2005         return first ? 0 : 1;
2006 }
2007
2008 _public_ int sd_journal_get_cutoff_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t *from, uint64_t *to) {
2009         Iterator i;
2010         JournalFile *f;
2011         bool first = true;
2012         int r;
2013
2014         if (!j)
2015                 return -EINVAL;
2016         if (!from && !to)
2017                 return -EINVAL;
2018
2019         HASHMAP_FOREACH(f, j->files, i) {
2020                 usec_t fr, t;
2021
2022                 r = journal_file_get_cutoff_monotonic_usec(f, boot_id, &fr, &t);
2023                 if (r == -ENOENT)
2024                         continue;
2025                 if (r < 0)
2026                         return r;
2027                 if (r == 0)
2028                         continue;
2029
2030                 if (first) {
2031                         if (from)
2032                                 *from = fr;
2033                         if (to)
2034                                 *to = t;
2035                         first = false;
2036                 } else {
2037                         if (from)
2038                                 *from = MIN(fr, *from);
2039                         if (to)
2040                                 *to = MIN(t, *to);
2041                 }
2042         }
2043
2044         return first ? 0 : 1;
2045 }
2046
2047 void journal_print_header(sd_journal *j) {
2048         Iterator i;
2049         JournalFile *f;
2050         bool newline = false;
2051
2052         assert(j);
2053
2054         HASHMAP_FOREACH(f, j->files, i) {
2055                 if (newline)
2056                         putchar('\n');
2057                 else
2058                         newline = true;
2059
2060                 journal_file_print_header(f);
2061         }
2062 }
2063
2064 /* _public_ int sd_journal_query_unique(sd_journal *j, const char *field) { */
2065 /*         if (!j) */
2066 /*                 return -EINVAL; */
2067 /*         if (!field) */
2068 /*                 return -EINVAL; */
2069
2070 /*         return -ENOTSUP; */
2071 /* } */
2072
2073 /* _public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l) { */
2074 /*         if (!j) */
2075 /*                 return -EINVAL; */
2076 /*         if (!data) */
2077 /*                 return -EINVAL; */
2078 /*         if (!l) */
2079 /*                 return -EINVAL; */
2080
2081 /*         return -ENOTSUP; */
2082 /* } */
2083
2084 /* _public_ void sd_journal_restart_unique(sd_journal *j) { */
2085 /*         if (!j) */
2086 /*                 return; */
2087 /* } */