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-rw-r--r--src/journal/sd-journal.c2391
1 files changed, 2391 insertions, 0 deletions
diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
new file mode 100644
index 0000000000..a346691e21
--- /dev/null
+++ b/src/journal/sd-journal.c
@@ -0,0 +1,2391 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2011 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <sys/inotify.h>
+#include <sys/poll.h>
+#include <sys/vfs.h>
+#include <linux/magic.h>
+
+#include "sd-journal.h"
+#include "journal-def.h"
+#include "journal-file.h"
+#include "hashmap.h"
+#include "list.h"
+#include "path-util.h"
+#include "lookup3.h"
+#include "compress.h"
+#include "journal-internal.h"
+#include "missing.h"
+
+#define JOURNAL_FILES_MAX 1024
+
+#define JOURNAL_FILES_RECHECK_USEC (2 * USEC_PER_SEC)
+
+static void detach_location(sd_journal *j) {
+ Iterator i;
+ JournalFile *f;
+
+ assert(j);
+
+ j->current_file = NULL;
+ j->current_field = 0;
+
+ HASHMAP_FOREACH(f, j->files, i)
+ f->current_offset = 0;
+}
+
+static void reset_location(sd_journal *j) {
+ assert(j);
+
+ detach_location(j);
+ zero(j->current_location);
+}
+
+static void init_location(Location *l, LocationType type, JournalFile *f, Object *o) {
+ assert(l);
+ assert(type == LOCATION_DISCRETE || type == LOCATION_SEEK);
+ assert(f);
+ assert(o->object.type == OBJECT_ENTRY);
+
+ l->type = type;
+ l->seqnum = le64toh(o->entry.seqnum);
+ l->seqnum_id = f->header->seqnum_id;
+ l->realtime = le64toh(o->entry.realtime);
+ l->monotonic = le64toh(o->entry.monotonic);
+ l->boot_id = o->entry.boot_id;
+ l->xor_hash = le64toh(o->entry.xor_hash);
+
+ l->seqnum_set = l->realtime_set = l->monotonic_set = l->xor_hash_set = true;
+}
+
+static void set_location(sd_journal *j, LocationType type, JournalFile *f, Object *o, uint64_t offset) {
+ assert(j);
+ assert(type == LOCATION_DISCRETE || type == LOCATION_SEEK);
+ assert(f);
+ assert(o);
+
+ init_location(&j->current_location, type, f, o);
+
+ j->current_file = f;
+ j->current_field = 0;
+
+ f->current_offset = offset;
+}
+
+static int match_is_valid(const void *data, size_t size) {
+ const char *b, *p;
+
+ assert(data);
+
+ if (size < 2)
+ return false;
+
+ if (startswith(data, "__"))
+ return false;
+
+ b = data;
+ for (p = b; p < b + size; p++) {
+
+ if (*p == '=')
+ return p > b;
+
+ if (*p == '_')
+ continue;
+
+ if (*p >= 'A' && *p <= 'Z')
+ continue;
+
+ if (*p >= '0' && *p <= '9')
+ continue;
+
+ return false;
+ }
+
+ return false;
+}
+
+static bool same_field(const void *_a, size_t s, const void *_b, size_t t) {
+ const uint8_t *a = _a, *b = _b;
+ size_t j;
+
+ for (j = 0; j < s && j < t; j++) {
+
+ if (a[j] != b[j])
+ return false;
+
+ if (a[j] == '=')
+ return true;
+ }
+
+ return true;
+}
+
+static Match *match_new(Match *p, MatchType t) {
+ Match *m;
+
+ m = new0(Match, 1);
+ if (!m)
+ return NULL;
+
+ m->type = t;
+
+ if (p) {
+ m->parent = p;
+ LIST_PREPEND(Match, matches, p->matches, m);
+ }
+
+ return m;
+}
+
+static void match_free(Match *m) {
+ assert(m);
+
+ while (m->matches)
+ match_free(m->matches);
+
+ if (m->parent)
+ LIST_REMOVE(Match, matches, m->parent->matches, m);
+
+ free(m->data);
+ free(m);
+}
+
+static void match_free_if_empty(Match *m) {
+ assert(m);
+
+ if (m->matches)
+ return;
+
+ match_free(m);
+}
+
+_public_ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
+ Match *l2, *l3, *add_here = NULL, *m;
+ le64_t le_hash;
+
+ if (!j)
+ return -EINVAL;
+
+ if (!data)
+ return -EINVAL;
+
+ if (size == 0)
+ size = strlen(data);
+
+ if (!match_is_valid(data, size))
+ return -EINVAL;
+
+ /* level 0: OR term
+ * level 1: AND terms
+ * level 2: OR terms
+ * level 3: concrete matches */
+
+ if (!j->level0) {
+ j->level0 = match_new(NULL, MATCH_OR_TERM);
+ if (!j->level0)
+ return -ENOMEM;
+ }
+
+ if (!j->level1) {
+ j->level1 = match_new(j->level0, MATCH_AND_TERM);
+ if (!j->level1)
+ return -ENOMEM;
+ }
+
+ assert(j->level0->type == MATCH_OR_TERM);
+ assert(j->level1->type == MATCH_AND_TERM);
+
+ le_hash = htole64(hash64(data, size));
+
+ LIST_FOREACH(matches, l2, j->level1->matches) {
+ assert(l2->type == MATCH_OR_TERM);
+
+ LIST_FOREACH(matches, l3, l2->matches) {
+ assert(l3->type == MATCH_DISCRETE);
+
+ /* Exactly the same match already? Then ignore
+ * this addition */
+ if (l3->le_hash == le_hash &&
+ l3->size == size &&
+ memcmp(l3->data, data, size) == 0)
+ return 0;
+
+ /* Same field? Then let's add this to this OR term */
+ if (same_field(data, size, l3->data, l3->size)) {
+ add_here = l2;
+ break;
+ }
+ }
+
+ if (add_here)
+ break;
+ }
+
+ if (!add_here) {
+ add_here = match_new(j->level1, MATCH_OR_TERM);
+ if (!add_here)
+ goto fail;
+ }
+
+ m = match_new(add_here, MATCH_DISCRETE);
+ if (!m)
+ goto fail;
+
+ m->le_hash = le_hash;
+ m->size = size;
+ m->data = memdup(data, size);
+ if (!m->data)
+ goto fail;
+
+ detach_location(j);
+
+ return 0;
+
+fail:
+ if (add_here)
+ match_free_if_empty(add_here);
+
+ if (j->level1)
+ match_free_if_empty(j->level1);
+
+ if (j->level0)
+ match_free_if_empty(j->level0);
+
+ return -ENOMEM;
+}
+
+_public_ int sd_journal_add_disjunction(sd_journal *j) {
+ Match *m;
+
+ assert(j);
+
+ if (!j->level0)
+ return 0;
+
+ if (!j->level1)
+ return 0;
+
+ if (!j->level1->matches)
+ return 0;
+
+ m = match_new(j->level0, MATCH_AND_TERM);
+ if (!m)
+ return -ENOMEM;
+
+ j->level1 = m;
+ return 0;
+}
+
+static char *match_make_string(Match *m) {
+ char *p, *r;
+ Match *i;
+ bool enclose = false;
+
+ if (!m)
+ return strdup("");
+
+ if (m->type == MATCH_DISCRETE)
+ return strndup(m->data, m->size);
+
+ p = NULL;
+ LIST_FOREACH(matches, i, m->matches) {
+ char *t, *k;
+
+ t = match_make_string(i);
+ if (!t) {
+ free(p);
+ return NULL;
+ }
+
+ if (p) {
+ k = strjoin(p, m->type == MATCH_OR_TERM ? " OR " : " AND ", t, NULL);
+ free(p);
+ free(t);
+
+ if (!k)
+ return NULL;
+
+ p = k;
+
+ enclose = true;
+ } else {
+ free(p);
+ p = t;
+ }
+ }
+
+ if (enclose) {
+ r = strjoin("(", p, ")", NULL);
+ free(p);
+ return r;
+ }
+
+ return p;
+}
+
+char *journal_make_match_string(sd_journal *j) {
+ assert(j);
+
+ return match_make_string(j->level0);
+}
+
+_public_ void sd_journal_flush_matches(sd_journal *j) {
+
+ if (!j)
+ return;
+
+ if (j->level0)
+ match_free(j->level0);
+
+ j->level0 = j->level1 = NULL;
+
+ detach_location(j);
+}
+
+static int compare_entry_order(JournalFile *af, Object *_ao,
+ JournalFile *bf, uint64_t bp) {
+
+ uint64_t a, b;
+ Object *ao, *bo;
+ int r;
+
+ assert(af);
+ assert(bf);
+ assert(_ao);
+
+ /* The mmap cache might invalidate the object from the first
+ * file if we look at the one from the second file. Hence
+ * temporarily copy the header of the first one, and look at
+ * that only. */
+ ao = alloca(offsetof(EntryObject, items));
+ memcpy(ao, _ao, offsetof(EntryObject, items));
+
+ r = journal_file_move_to_object(bf, OBJECT_ENTRY, bp, &bo);
+ if (r < 0)
+ return strcmp(af->path, bf->path);
+
+ /* We operate on two different files here, hence we can access
+ * two objects at the same time, which we normally can't.
+ *
+ * If contents and timestamps match, these entries are
+ * identical, even if the seqnum does not match */
+
+ if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id) &&
+ ao->entry.monotonic == bo->entry.monotonic &&
+ ao->entry.realtime == bo->entry.realtime &&
+ ao->entry.xor_hash == bo->entry.xor_hash)
+ return 0;
+
+ if (sd_id128_equal(af->header->seqnum_id, bf->header->seqnum_id)) {
+
+ /* If this is from the same seqnum source, compare
+ * seqnums */
+ a = le64toh(ao->entry.seqnum);
+ b = le64toh(bo->entry.seqnum);
+
+ if (a < b)
+ return -1;
+ if (a > b)
+ return 1;
+
+ /* Wow! This is weird, different data but the same
+ * seqnums? Something is borked, but let's make the
+ * best of it and compare by time. */
+ }
+
+ if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id)) {
+
+ /* If the boot id matches compare monotonic time */
+ a = le64toh(ao->entry.monotonic);
+ b = le64toh(bo->entry.monotonic);
+
+ if (a < b)
+ return -1;
+ if (a > b)
+ return 1;
+ }
+
+ /* Otherwise compare UTC time */
+ a = le64toh(ao->entry.realtime);
+ b = le64toh(bo->entry.realtime);
+
+ if (a < b)
+ return -1;
+ if (a > b)
+ return 1;
+
+ /* Finally, compare by contents */
+ a = le64toh(ao->entry.xor_hash);
+ b = le64toh(bo->entry.xor_hash);
+
+ if (a < b)
+ return -1;
+ if (a > b)
+ return 1;
+
+ return 0;
+}
+
+static int compare_with_location(JournalFile *af, Object *ao, Location *l) {
+ uint64_t a;
+
+ assert(af);
+ assert(ao);
+ assert(l);
+ assert(l->type == LOCATION_DISCRETE || l->type == LOCATION_SEEK);
+
+ if (l->monotonic_set &&
+ sd_id128_equal(ao->entry.boot_id, l->boot_id) &&
+ l->realtime_set &&
+ le64toh(ao->entry.realtime) == l->realtime &&
+ l->xor_hash_set &&
+ le64toh(ao->entry.xor_hash) == l->xor_hash)
+ return 0;
+
+ if (l->seqnum_set &&
+ sd_id128_equal(af->header->seqnum_id, l->seqnum_id)) {
+
+ a = le64toh(ao->entry.seqnum);
+
+ if (a < l->seqnum)
+ return -1;
+ if (a > l->seqnum)
+ return 1;
+ }
+
+ if (l->monotonic_set &&
+ sd_id128_equal(ao->entry.boot_id, l->boot_id)) {
+
+ a = le64toh(ao->entry.monotonic);
+
+ if (a < l->monotonic)
+ return -1;
+ if (a > l->monotonic)
+ return 1;
+ }
+
+ if (l->realtime_set) {
+
+ a = le64toh(ao->entry.realtime);
+
+ if (a < l->realtime)
+ return -1;
+ if (a > l->realtime)
+ return 1;
+ }
+
+ if (l->xor_hash_set) {
+ a = le64toh(ao->entry.xor_hash);
+
+ if (a < l->xor_hash)
+ return -1;
+ if (a > l->xor_hash)
+ return 1;
+ }
+
+ return 0;
+}
+
+static int next_for_match(
+ sd_journal *j,
+ Match *m,
+ JournalFile *f,
+ uint64_t after_offset,
+ direction_t direction,
+ Object **ret,
+ uint64_t *offset) {
+
+ int r;
+ uint64_t np = 0;
+ Object *n;
+
+ assert(j);
+ assert(m);
+ assert(f);
+
+ if (m->type == MATCH_DISCRETE) {
+ uint64_t dp;
+
+ r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), NULL, &dp);
+ if (r <= 0)
+ return r;
+
+ return journal_file_move_to_entry_by_offset_for_data(f, dp, after_offset, direction, ret, offset);
+
+ } else if (m->type == MATCH_OR_TERM) {
+ Match *i;
+
+ /* Find the earliest match beyond after_offset */
+
+ LIST_FOREACH(matches, i, m->matches) {
+ uint64_t cp;
+
+ r = next_for_match(j, i, f, after_offset, direction, NULL, &cp);
+ if (r < 0)
+ return r;
+ else if (r > 0) {
+ if (np == 0 || (direction == DIRECTION_DOWN ? np > cp : np < cp))
+ np = cp;
+ }
+ }
+
+ } else if (m->type == MATCH_AND_TERM) {
+ Match *i;
+ bool continue_looking;
+
+ /* Always jump to the next matching entry and repeat
+ * this until we fine and offset that matches for all
+ * matches. */
+
+ if (!m->matches)
+ return 0;
+
+ np = 0;
+ do {
+ continue_looking = false;
+
+ LIST_FOREACH(matches, i, m->matches) {
+ uint64_t cp, limit;
+
+ if (np == 0)
+ limit = after_offset;
+ else if (direction == DIRECTION_DOWN)
+ limit = MAX(np, after_offset);
+ else
+ limit = MIN(np, after_offset);
+
+ r = next_for_match(j, i, f, limit, direction, NULL, &cp);
+ if (r <= 0)
+ return r;
+
+ if ((direction == DIRECTION_DOWN ? cp >= after_offset : cp <= after_offset) &&
+ (np == 0 || (direction == DIRECTION_DOWN ? cp > np : np < cp))) {
+ np = cp;
+ continue_looking = true;
+ }
+ }
+
+ } while (continue_looking);
+ }
+
+ if (np == 0)
+ return 0;
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY, np, &n);
+ if (r < 0)
+ return r;
+
+ if (ret)
+ *ret = n;
+ if (offset)
+ *offset = np;
+
+ return 1;
+}
+
+static int find_location_for_match(
+ sd_journal *j,
+ Match *m,
+ JournalFile *f,
+ direction_t direction,
+ Object **ret,
+ uint64_t *offset) {
+
+ int r;
+
+ assert(j);
+ assert(m);
+ assert(f);
+
+ if (m->type == MATCH_DISCRETE) {
+ uint64_t dp;
+
+ r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), NULL, &dp);
+ if (r <= 0)
+ return r;
+
+ /* FIXME: missing: find by monotonic */
+
+ if (j->current_location.type == LOCATION_HEAD)
+ return journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_DOWN, ret, offset);
+ if (j->current_location.type == LOCATION_TAIL)
+ return journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_UP, ret, offset);
+ if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
+ return journal_file_move_to_entry_by_seqnum_for_data(f, dp, j->current_location.seqnum, direction, ret, offset);
+ if (j->current_location.monotonic_set) {
+ r = journal_file_move_to_entry_by_monotonic_for_data(f, dp, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
+ if (r != -ENOENT)
+ return r;
+ }
+ if (j->current_location.realtime_set)
+ return journal_file_move_to_entry_by_realtime_for_data(f, dp, j->current_location.realtime, direction, ret, offset);
+
+ return journal_file_next_entry_for_data(f, NULL, 0, dp, direction, ret, offset);
+
+ } else if (m->type == MATCH_OR_TERM) {
+ uint64_t np = 0;
+ Object *n;
+ Match *i;
+
+ /* Find the earliest match */
+
+ LIST_FOREACH(matches, i, m->matches) {
+ uint64_t cp;
+
+ r = find_location_for_match(j, i, f, direction, NULL, &cp);
+ if (r < 0)
+ return r;
+ else if (r > 0) {
+ if (np == 0 || (direction == DIRECTION_DOWN ? np > cp : np < cp))
+ np = cp;
+ }
+ }
+
+ if (np == 0)
+ return 0;
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY, np, &n);
+ if (r < 0)
+ return r;
+
+ if (ret)
+ *ret = n;
+ if (offset)
+ *offset = np;
+
+ return 1;
+
+ } else {
+ Match *i;
+ uint64_t np = 0;
+
+ assert(m->type == MATCH_AND_TERM);
+
+ /* First jump to the last match, and then find the
+ * next one where all matches match */
+
+ if (!m->matches)
+ return 0;
+
+ LIST_FOREACH(matches, i, m->matches) {
+ uint64_t cp;
+
+ r = find_location_for_match(j, i, f, direction, NULL, &cp);
+ if (r <= 0)
+ return r;
+
+ if (np == 0 || (direction == DIRECTION_DOWN ? np < cp : np > cp))
+ np = cp;
+ }
+
+ return next_for_match(j, m, f, np, direction, ret, offset);
+ }
+}
+
+static int find_location_with_matches(
+ sd_journal *j,
+ JournalFile *f,
+ direction_t direction,
+ Object **ret,
+ uint64_t *offset) {
+
+ int r;
+
+ assert(j);
+ assert(f);
+ assert(ret);
+ assert(offset);
+
+ if (!j->level0) {
+ /* No matches is simple */
+
+ if (j->current_location.type == LOCATION_HEAD)
+ return journal_file_next_entry(f, NULL, 0, DIRECTION_DOWN, ret, offset);
+ if (j->current_location.type == LOCATION_TAIL)
+ return journal_file_next_entry(f, NULL, 0, DIRECTION_UP, ret, offset);
+ if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
+ return journal_file_move_to_entry_by_seqnum(f, j->current_location.seqnum, direction, ret, offset);
+ if (j->current_location.monotonic_set) {
+ r = journal_file_move_to_entry_by_monotonic(f, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
+ if (r != -ENOENT)
+ return r;
+ }
+ if (j->current_location.realtime_set)
+ return journal_file_move_to_entry_by_realtime(f, j->current_location.realtime, direction, ret, offset);
+
+ return journal_file_next_entry(f, NULL, 0, direction, ret, offset);
+ } else
+ return find_location_for_match(j, j->level0, f, direction, ret, offset);
+}
+
+static int next_with_matches(
+ sd_journal *j,
+ JournalFile *f,
+ direction_t direction,
+ Object **ret,
+ uint64_t *offset) {
+
+ Object *c;
+ uint64_t cp;
+
+ assert(j);
+ assert(f);
+ assert(ret);
+ assert(offset);
+
+ c = *ret;
+ cp = *offset;
+
+ /* No matches is easy. We simple advance the file
+ * pointer by one. */
+ if (!j->level0)
+ return journal_file_next_entry(f, c, cp, direction, ret, offset);
+
+ /* If we have a match then we look for the next matching entry
+ * with an offset at least one step larger */
+ return next_for_match(j, j->level0, f, direction == DIRECTION_DOWN ? cp+1 : cp-1, direction, ret, offset);
+}
+
+static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) {
+ Object *c;
+ uint64_t cp;
+ int r;
+
+ assert(j);
+ assert(f);
+
+ if (f->current_offset > 0) {
+ cp = f->current_offset;
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY, cp, &c);
+ if (r < 0)
+ return r;
+
+ r = next_with_matches(j, f, direction, &c, &cp);
+ if (r <= 0)
+ return r;
+ } else {
+ r = find_location_with_matches(j, f, direction, &c, &cp);
+ if (r <= 0)
+ return r;
+ }
+
+ /* OK, we found the spot, now let's advance until to an entry
+ * that is actually different from what we were previously
+ * looking at. This is necessary to handle entries which exist
+ * in two (or more) journal files, and which shall all be
+ * suppressed but one. */
+
+ for (;;) {
+ bool found;
+
+ if (j->current_location.type == LOCATION_DISCRETE) {
+ int k;
+
+ k = compare_with_location(f, c, &j->current_location);
+ if (direction == DIRECTION_DOWN)
+ found = k > 0;
+ else
+ found = k < 0;
+ } else
+ found = true;
+
+ if (found) {
+ if (ret)
+ *ret = c;
+ if (offset)
+ *offset = cp;
+ return 1;
+ }
+
+ r = next_with_matches(j, f, direction, &c, &cp);
+ if (r <= 0)
+ return r;
+ }
+}
+
+static int real_journal_next(sd_journal *j, direction_t direction) {
+ JournalFile *f, *new_file = NULL;
+ uint64_t new_offset = 0;
+ Object *o;
+ uint64_t p;
+ Iterator i;
+ int r;
+
+ if (!j)
+ return -EINVAL;
+
+ HASHMAP_FOREACH(f, j->files, i) {
+ bool found;
+
+ r = next_beyond_location(j, f, direction, &o, &p);
+ if (r < 0) {
+ log_debug("Can't iterate through %s, ignoring: %s", f->path, strerror(-r));
+ continue;
+ } else if (r == 0)
+ continue;
+
+ if (!new_file)
+ found = true;
+ else {
+ int k;
+
+ k = compare_entry_order(f, o, new_file, new_offset);
+
+ if (direction == DIRECTION_DOWN)
+ found = k < 0;
+ else
+ found = k > 0;
+ }
+
+ if (found) {
+ new_file = f;
+ new_offset = p;
+ }
+ }
+
+ if (!new_file)
+ return 0;
+
+ r = journal_file_move_to_object(new_file, OBJECT_ENTRY, new_offset, &o);
+ if (r < 0)
+ return r;
+
+ set_location(j, LOCATION_DISCRETE, new_file, o, new_offset);
+
+ return 1;
+}
+
+_public_ int sd_journal_next(sd_journal *j) {
+ return real_journal_next(j, DIRECTION_DOWN);
+}
+
+_public_ int sd_journal_previous(sd_journal *j) {
+ return real_journal_next(j, DIRECTION_UP);
+}
+
+static int real_journal_next_skip(sd_journal *j, direction_t direction, uint64_t skip) {
+ int c = 0, r;
+
+ if (!j)
+ return -EINVAL;
+
+ if (skip == 0) {
+ /* If this is not a discrete skip, then at least
+ * resolve the current location */
+ if (j->current_location.type != LOCATION_DISCRETE)
+ return real_journal_next(j, direction);
+
+ return 0;
+ }
+
+ do {
+ r = real_journal_next(j, direction);
+ if (r < 0)
+ return r;
+
+ if (r == 0)
+ return c;
+
+ skip--;
+ c++;
+ } while (skip > 0);
+
+ return c;
+}
+
+_public_ int sd_journal_next_skip(sd_journal *j, uint64_t skip) {
+ return real_journal_next_skip(j, DIRECTION_DOWN, skip);
+}
+
+_public_ int sd_journal_previous_skip(sd_journal *j, uint64_t skip) {
+ return real_journal_next_skip(j, DIRECTION_UP, skip);
+}
+
+_public_ int sd_journal_get_cursor(sd_journal *j, char **cursor) {
+ Object *o;
+ int r;
+ char bid[33], sid[33];
+
+ if (!j)
+ return -EINVAL;
+ if (!cursor)
+ return -EINVAL;
+
+ if (!j->current_file || j->current_file->current_offset <= 0)
+ return -EADDRNOTAVAIL;
+
+ r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
+ if (r < 0)
+ return r;
+
+ sd_id128_to_string(j->current_file->header->seqnum_id, sid);
+ sd_id128_to_string(o->entry.boot_id, bid);
+
+ if (asprintf(cursor,
+ "s=%s;i=%llx;b=%s;m=%llx;t=%llx;x=%llx",
+ sid, (unsigned long long) le64toh(o->entry.seqnum),
+ bid, (unsigned long long) le64toh(o->entry.monotonic),
+ (unsigned long long) le64toh(o->entry.realtime),
+ (unsigned long long) le64toh(o->entry.xor_hash)) < 0)
+ return -ENOMEM;
+
+ return 1;
+}
+
+_public_ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
+ char *w, *state;
+ size_t l;
+ unsigned long long seqnum, monotonic, realtime, xor_hash;
+ bool
+ seqnum_id_set = false,
+ seqnum_set = false,
+ boot_id_set = false,
+ monotonic_set = false,
+ realtime_set = false,
+ xor_hash_set = false;
+ sd_id128_t seqnum_id, boot_id;
+
+ if (!j)
+ return -EINVAL;
+ if (isempty(cursor))
+ return -EINVAL;
+
+ FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
+ char *item;
+ int k = 0;
+
+ if (l < 2 || w[1] != '=')
+ return -EINVAL;
+
+ item = strndup(w, l);
+ if (!item)
+ return -ENOMEM;
+
+ switch (w[0]) {
+
+ case 's':
+ seqnum_id_set = true;
+ k = sd_id128_from_string(item+2, &seqnum_id);
+ break;
+
+ case 'i':
+ seqnum_set = true;
+ if (sscanf(item+2, "%llx", &seqnum) != 1)
+ k = -EINVAL;
+ break;
+
+ case 'b':
+ boot_id_set = true;
+ k = sd_id128_from_string(item+2, &boot_id);
+ break;
+
+ case 'm':
+ monotonic_set = true;
+ if (sscanf(item+2, "%llx", &monotonic) != 1)
+ k = -EINVAL;
+ break;
+
+ case 't':
+ realtime_set = true;
+ if (sscanf(item+2, "%llx", &realtime) != 1)
+ k = -EINVAL;
+ break;
+
+ case 'x':
+ xor_hash_set = true;
+ if (sscanf(item+2, "%llx", &xor_hash) != 1)
+ k = -EINVAL;
+ break;
+ }
+
+ free(item);
+
+ if (k < 0)
+ return k;
+ }
+
+ if ((!seqnum_set || !seqnum_id_set) &&
+ (!monotonic_set || !boot_id_set) &&
+ !realtime_set)
+ return -EINVAL;
+
+ reset_location(j);
+
+ j->current_location.type = LOCATION_SEEK;
+
+ if (realtime_set) {
+ j->current_location.realtime = (uint64_t) realtime;
+ j->current_location.realtime_set = true;
+ }
+
+ if (seqnum_set && seqnum_id_set) {
+ j->current_location.seqnum = (uint64_t) seqnum;
+ j->current_location.seqnum_id = seqnum_id;
+ j->current_location.seqnum_set = true;
+ }
+
+ if (monotonic_set && boot_id_set) {
+ j->current_location.monotonic = (uint64_t) monotonic;
+ j->current_location.boot_id = boot_id;
+ j->current_location.monotonic_set = true;
+ }
+
+ if (xor_hash_set) {
+ j->current_location.xor_hash = (uint64_t) xor_hash;
+ j->current_location.xor_hash_set = true;
+ }
+
+ return 0;
+}
+
+_public_ int sd_journal_test_cursor(sd_journal *j, const char *cursor) {
+ int r;
+ char *w, *state;
+ size_t l;
+ Object *o;
+
+ if (!j)
+ return -EINVAL;
+ if (isempty(cursor))
+ return -EINVAL;
+
+ if (!j->current_file || j->current_file->current_offset <= 0)
+ return -EADDRNOTAVAIL;
+
+ r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
+ if (r < 0)
+ return r;
+
+ FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
+ _cleanup_free_ char *item = NULL;
+ sd_id128_t id;
+ unsigned long long ll;
+ int k = 0;
+
+ if (l < 2 || w[1] != '=')
+ return -EINVAL;
+
+ item = strndup(w, l);
+ if (!item)
+ return -ENOMEM;
+
+ switch (w[0]) {
+
+ case 's':
+ k = sd_id128_from_string(item+2, &id);
+ if (k < 0)
+ return k;
+ if (!sd_id128_equal(id, j->current_file->header->seqnum_id))
+ return 0;
+ break;
+
+ case 'i':
+ if (sscanf(item+2, "%llx", &ll) != 1)
+ return -EINVAL;
+ if (ll != le64toh(o->entry.seqnum))
+ return 0;
+ break;
+
+ case 'b':
+ k = sd_id128_from_string(item+2, &id);
+ if (k < 0)
+ return k;
+ if (!sd_id128_equal(id, o->entry.boot_id))
+ return 0;
+ break;
+
+ case 'm':
+ if (sscanf(item+2, "%llx", &ll) != 1)
+ return -EINVAL;
+ if (ll != le64toh(o->entry.monotonic))
+ return 0;
+ break;
+
+ case 't':
+ if (sscanf(item+2, "%llx", &ll) != 1)
+ return -EINVAL;
+ if (ll != le64toh(o->entry.realtime))
+ return 0;
+ break;
+
+ case 'x':
+ if (sscanf(item+2, "%llx", &ll) != 1)
+ return -EINVAL;
+ if (ll != le64toh(o->entry.xor_hash))
+ return 0;
+ break;
+ }
+ }
+
+ return 1;
+}
+
+
+_public_ int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t usec) {
+ if (!j)
+ return -EINVAL;
+
+ reset_location(j);
+ j->current_location.type = LOCATION_SEEK;
+ j->current_location.boot_id = boot_id;
+ j->current_location.monotonic = usec;
+ j->current_location.monotonic_set = true;
+
+ return 0;
+}
+
+_public_ int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec) {
+ if (!j)
+ return -EINVAL;
+
+ reset_location(j);
+ j->current_location.type = LOCATION_SEEK;
+ j->current_location.realtime = usec;
+ j->current_location.realtime_set = true;
+
+ return 0;
+}
+
+_public_ int sd_journal_seek_head(sd_journal *j) {
+ if (!j)
+ return -EINVAL;
+
+ reset_location(j);
+ j->current_location.type = LOCATION_HEAD;
+
+ return 0;
+}
+
+_public_ int sd_journal_seek_tail(sd_journal *j) {
+ if (!j)
+ return -EINVAL;
+
+ reset_location(j);
+ j->current_location.type = LOCATION_TAIL;
+
+ return 0;
+}
+
+static void check_network(sd_journal *j, int fd) {
+ struct statfs sfs;
+
+ assert(j);
+
+ if (j->on_network)
+ return;
+
+ if (fstatfs(fd, &sfs) < 0)
+ return;
+
+ j->on_network =
+ sfs.f_type == CIFS_MAGIC_NUMBER ||
+ sfs.f_type == CODA_SUPER_MAGIC ||
+ sfs.f_type == NCP_SUPER_MAGIC ||
+ sfs.f_type == NFS_SUPER_MAGIC ||
+ sfs.f_type == SMB_SUPER_MAGIC;
+}
+
+static int add_file(sd_journal *j, const char *prefix, const char *filename) {
+ char *path;
+ int r;
+ JournalFile *f;
+
+ assert(j);
+ assert(prefix);
+ assert(filename);
+
+ if ((j->flags & SD_JOURNAL_SYSTEM_ONLY) &&
+ !(streq(filename, "system.journal") ||
+ streq(filename, "system.journal~") ||
+ (startswith(filename, "system@") &&
+ (endswith(filename, ".journal") || endswith(filename, ".journal~")))))
+ return 0;
+
+ path = strjoin(prefix, "/", filename, NULL);
+ if (!path)
+ return -ENOMEM;
+
+ if (hashmap_get(j->files, path)) {
+ free(path);
+ return 0;
+ }
+
+ if (hashmap_size(j->files) >= JOURNAL_FILES_MAX) {
+ log_debug("Too many open journal files, not adding %s, ignoring.", path);
+ free(path);
+ return 0;
+ }
+
+ r = journal_file_open(path, O_RDONLY, 0, false, false, NULL, j->mmap, NULL, &f);
+ free(path);
+
+ if (r < 0) {
+ if (errno == ENOENT)
+ return 0;
+
+ return r;
+ }
+
+ /* journal_file_dump(f); */
+
+ r = hashmap_put(j->files, f->path, f);
+ if (r < 0) {
+ journal_file_close(f);
+ return r;
+ }
+
+ check_network(j, f->fd);
+
+ j->current_invalidate_counter ++;
+
+ log_debug("File %s got added.", f->path);
+
+ return 0;
+}
+
+static int remove_file(sd_journal *j, const char *prefix, const char *filename) {
+ char *path;
+ JournalFile *f;
+
+ assert(j);
+ assert(prefix);
+ assert(filename);
+
+ path = strjoin(prefix, "/", filename, NULL);
+ if (!path)
+ return -ENOMEM;
+
+ f = hashmap_get(j->files, path);
+ free(path);
+ if (!f)
+ return 0;
+
+ hashmap_remove(j->files, f->path);
+
+ log_debug("File %s got removed.", f->path);
+
+ if (j->current_file == f) {
+ j->current_file = NULL;
+ j->current_field = 0;
+ }
+
+ if (j->unique_file == f) {
+ j->unique_file = NULL;
+ j->unique_offset = 0;
+ }
+
+ journal_file_close(f);
+
+ j->current_invalidate_counter ++;
+
+ return 0;
+}
+
+static int add_directory(sd_journal *j, const char *prefix, const char *dirname) {
+ char *path;
+ int r;
+ DIR *d;
+ sd_id128_t id, mid;
+ Directory *m;
+
+ assert(j);
+ assert(prefix);
+ assert(dirname);
+
+ if ((j->flags & SD_JOURNAL_LOCAL_ONLY) &&
+ (sd_id128_from_string(dirname, &id) < 0 ||
+ sd_id128_get_machine(&mid) < 0 ||
+ !sd_id128_equal(id, mid)))
+ return 0;
+
+ path = strjoin(prefix, "/", dirname, NULL);
+ if (!path)
+ return -ENOMEM;
+
+ d = opendir(path);
+ if (!d) {
+ log_debug("Failed to open %s: %m", path);
+ free(path);
+
+ if (errno == ENOENT)
+ return 0;
+ return -errno;
+ }
+
+ m = hashmap_get(j->directories_by_path, path);
+ if (!m) {
+ m = new0(Directory, 1);
+ if (!m) {
+ closedir(d);
+ free(path);
+ return -ENOMEM;
+ }
+
+ m->is_root = false;
+ m->path = path;
+
+ if (hashmap_put(j->directories_by_path, m->path, m) < 0) {
+ closedir(d);
+ free(m->path);
+ free(m);
+ return -ENOMEM;
+ }
+
+ j->current_invalidate_counter ++;
+
+ log_debug("Directory %s got added.", m->path);
+
+ } else if (m->is_root) {
+ free (path);
+ closedir(d);
+ return 0;
+ } else
+ free(path);
+
+ if (m->wd <= 0 && j->inotify_fd >= 0) {
+
+ m->wd = inotify_add_watch(j->inotify_fd, m->path,
+ IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
+ IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|IN_MOVED_FROM|
+ IN_ONLYDIR);
+
+ if (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0)
+ inotify_rm_watch(j->inotify_fd, m->wd);
+ }
+
+ for (;;) {
+ struct dirent *de;
+ union dirent_storage buf;
+
+ r = readdir_r(d, &buf.de, &de);
+ if (r != 0 || !de)
+ break;
+
+ if (dirent_is_file_with_suffix(de, ".journal") ||
+ dirent_is_file_with_suffix(de, ".journal~")) {
+ r = add_file(j, m->path, de->d_name);
+ if (r < 0)
+ log_debug("Failed to add file %s/%s: %s", m->path, de->d_name, strerror(-r));
+ }
+ }
+
+ check_network(j, dirfd(d));
+
+ closedir(d);
+
+ return 0;
+}
+
+static int add_root_directory(sd_journal *j, const char *p) {
+ DIR *d;
+ Directory *m;
+ int r;
+
+ assert(j);
+ assert(p);
+
+ if ((j->flags & SD_JOURNAL_RUNTIME_ONLY) &&
+ !path_startswith(p, "/run"))
+ return -EINVAL;
+
+ d = opendir(p);
+ if (!d)
+ return -errno;
+
+ m = hashmap_get(j->directories_by_path, p);
+ if (!m) {
+ m = new0(Directory, 1);
+ if (!m) {
+ closedir(d);
+ return -ENOMEM;
+ }
+
+ m->is_root = true;
+ m->path = strdup(p);
+ if (!m->path) {
+ closedir(d);
+ free(m);
+ return -ENOMEM;
+ }
+
+ if (hashmap_put(j->directories_by_path, m->path, m) < 0) {
+ closedir(d);
+ free(m->path);
+ free(m);
+ return -ENOMEM;
+ }
+
+ j->current_invalidate_counter ++;
+
+ log_debug("Root directory %s got added.", m->path);
+
+ } else if (!m->is_root) {
+ closedir(d);
+ return 0;
+ }
+
+ if (m->wd <= 0 && j->inotify_fd >= 0) {
+
+ m->wd = inotify_add_watch(j->inotify_fd, m->path,
+ IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
+ IN_ONLYDIR);
+
+ if (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0)
+ inotify_rm_watch(j->inotify_fd, m->wd);
+ }
+
+ for (;;) {
+ struct dirent *de;
+ union dirent_storage buf;
+ sd_id128_t id;
+
+ r = readdir_r(d, &buf.de, &de);
+ if (r != 0 || !de)
+ break;
+
+ if (dirent_is_file_with_suffix(de, ".journal") ||
+ dirent_is_file_with_suffix(de, ".journal~")) {
+ r = add_file(j, m->path, de->d_name);
+ if (r < 0)
+ log_debug("Failed to add file %s/%s: %s", m->path, de->d_name, strerror(-r));
+
+ } else if ((de->d_type == DT_DIR || de->d_type == DT_LNK || de->d_type == DT_UNKNOWN) &&
+ sd_id128_from_string(de->d_name, &id) >= 0) {
+
+ r = add_directory(j, m->path, de->d_name);
+ if (r < 0)
+ log_debug("Failed to add directory %s/%s: %s", m->path, de->d_name, strerror(-r));
+ }
+ }
+
+ check_network(j, dirfd(d));
+
+ closedir(d);
+
+ return 0;
+}
+
+static int remove_directory(sd_journal *j, Directory *d) {
+ assert(j);
+
+ if (d->wd > 0) {
+ hashmap_remove(j->directories_by_wd, INT_TO_PTR(d->wd));
+
+ if (j->inotify_fd >= 0)
+ inotify_rm_watch(j->inotify_fd, d->wd);
+ }
+
+ hashmap_remove(j->directories_by_path, d->path);
+
+ if (d->is_root)
+ log_debug("Root directory %s got removed.", d->path);
+ else
+ log_debug("Directory %s got removed.", d->path);
+
+ free(d->path);
+ free(d);
+
+ return 0;
+}
+
+static int add_search_paths(sd_journal *j) {
+
+ const char search_paths[] =
+ "/run/log/journal\0"
+ "/var/log/journal\0";
+ const char *p;
+
+ assert(j);
+
+ /* We ignore most errors here, since the idea is to only open
+ * what's actually accessible, and ignore the rest. */
+
+ NULSTR_FOREACH(p, search_paths)
+ add_root_directory(j, p);
+
+ return 0;
+}
+
+static int allocate_inotify(sd_journal *j) {
+ assert(j);
+
+ if (j->inotify_fd < 0) {
+ j->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
+ if (j->inotify_fd < 0)
+ return -errno;
+ }
+
+ if (!j->directories_by_wd) {
+ j->directories_by_wd = hashmap_new(trivial_hash_func, trivial_compare_func);
+ if (!j->directories_by_wd)
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static sd_journal *journal_new(int flags, const char *path) {
+ sd_journal *j;
+
+ j = new0(sd_journal, 1);
+ if (!j)
+ return NULL;
+
+ j->inotify_fd = -1;
+ j->flags = flags;
+
+ if (path) {
+ j->path = strdup(path);
+ if (!j->path) {
+ free(j);
+ return NULL;
+ }
+ }
+
+ j->files = hashmap_new(string_hash_func, string_compare_func);
+ if (!j->files) {
+ free(j->path);
+ free(j);
+ return NULL;
+ }
+
+ j->directories_by_path = hashmap_new(string_hash_func, string_compare_func);
+ if (!j->directories_by_path) {
+ hashmap_free(j->files);
+ free(j->path);
+ free(j);
+ return NULL;
+ }
+
+ j->mmap = mmap_cache_new();
+ if (!j->mmap) {
+ hashmap_free(j->files);
+ hashmap_free(j->directories_by_path);
+ free(j->path);
+ free(j);
+ return NULL;
+ }
+
+ return j;
+}
+
+_public_ int sd_journal_open(sd_journal **ret, int flags) {
+ sd_journal *j;
+ int r;
+
+ if (!ret)
+ return -EINVAL;
+
+ if (flags & ~(SD_JOURNAL_LOCAL_ONLY|
+ SD_JOURNAL_RUNTIME_ONLY|
+ SD_JOURNAL_SYSTEM_ONLY))
+ return -EINVAL;
+
+ j = journal_new(flags, NULL);
+ if (!j)
+ return -ENOMEM;
+
+ r = add_search_paths(j);
+ if (r < 0)
+ goto fail;
+
+ *ret = j;
+ return 0;
+
+fail:
+ sd_journal_close(j);
+
+ return r;
+}
+
+_public_ int sd_journal_open_directory(sd_journal **ret, const char *path, int flags) {
+ sd_journal *j;
+ int r;
+
+ if (!ret)
+ return -EINVAL;
+
+ if (!path || !path_is_absolute(path))
+ return -EINVAL;
+
+ if (flags != 0)
+ return -EINVAL;
+
+ j = journal_new(flags, path);
+ if (!j)
+ return -ENOMEM;
+
+ r = add_root_directory(j, path);
+ if (r < 0)
+ goto fail;
+
+ *ret = j;
+ return 0;
+
+fail:
+ sd_journal_close(j);
+
+ return r;
+}
+
+_public_ void sd_journal_close(sd_journal *j) {
+ Directory *d;
+ JournalFile *f;
+
+ if (!j)
+ return;
+
+ while ((f = hashmap_steal_first(j->files)))
+ journal_file_close(f);
+
+ hashmap_free(j->files);
+
+ while ((d = hashmap_first(j->directories_by_path)))
+ remove_directory(j, d);
+
+ while ((d = hashmap_first(j->directories_by_wd)))
+ remove_directory(j, d);
+
+ hashmap_free(j->directories_by_path);
+ hashmap_free(j->directories_by_wd);
+
+ if (j->inotify_fd >= 0)
+ close_nointr_nofail(j->inotify_fd);
+
+ sd_journal_flush_matches(j);
+
+ if (j->mmap)
+ mmap_cache_unref(j->mmap);
+
+ free(j->path);
+ free(j->unique_field);
+ free(j);
+}
+
+_public_ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
+ Object *o;
+ JournalFile *f;
+ int r;
+
+ if (!j)
+ return -EINVAL;
+ if (!ret)
+ return -EINVAL;
+
+ f = j->current_file;
+ if (!f)
+ return -EADDRNOTAVAIL;
+
+ if (f->current_offset <= 0)
+ return -EADDRNOTAVAIL;
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
+ if (r < 0)
+ return r;
+
+ *ret = le64toh(o->entry.realtime);
+ return 0;
+}
+
+_public_ int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *ret, sd_id128_t *ret_boot_id) {
+ Object *o;
+ JournalFile *f;
+ int r;
+ sd_id128_t id;
+
+ if (!j)
+ return -EINVAL;
+
+ f = j->current_file;
+ if (!f)
+ return -EADDRNOTAVAIL;
+
+ if (f->current_offset <= 0)
+ return -EADDRNOTAVAIL;
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
+ if (r < 0)
+ return r;
+
+ if (ret_boot_id)
+ *ret_boot_id = o->entry.boot_id;
+ else {
+ r = sd_id128_get_boot(&id);
+ if (r < 0)
+ return r;
+
+ if (!sd_id128_equal(id, o->entry.boot_id))
+ return -ESTALE;
+ }
+
+ if (ret)
+ *ret = le64toh(o->entry.monotonic);
+
+ return 0;
+}
+
+static bool field_is_valid(const char *field) {
+ const char *p;
+
+ assert(field);
+
+ if (isempty(field))
+ return false;
+
+ if (startswith(field, "__"))
+ return false;
+
+ for (p = field; *p; p++) {
+
+ if (*p == '_')
+ continue;
+
+ if (*p >= 'A' && *p <= 'Z')
+ continue;
+
+ if (*p >= '0' && *p <= '9')
+ continue;
+
+ return false;
+ }
+
+ return true;
+}
+
+_public_ int sd_journal_get_data(sd_journal *j, const char *field, const void **data, size_t *size) {
+ JournalFile *f;
+ uint64_t i, n;
+ size_t field_length;
+ int r;
+ Object *o;
+
+ if (!j)
+ return -EINVAL;
+ if (!field)
+ return -EINVAL;
+ if (!data)
+ return -EINVAL;
+ if (!size)
+ return -EINVAL;
+
+ if (!field_is_valid(field))
+ return -EINVAL;
+
+ f = j->current_file;
+ if (!f)
+ return -EADDRNOTAVAIL;
+
+ if (f->current_offset <= 0)
+ return -EADDRNOTAVAIL;
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
+ if (r < 0)
+ return r;
+
+ field_length = strlen(field);
+
+ n = journal_file_entry_n_items(o);
+ for (i = 0; i < n; i++) {
+ uint64_t p, l;
+ le64_t le_hash;
+ size_t t;
+
+ p = le64toh(o->entry.items[i].object_offset);
+ le_hash = o->entry.items[i].hash;
+ r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
+ if (r < 0)
+ return r;
+
+ if (le_hash != o->data.hash)
+ return -EBADMSG;
+
+ l = le64toh(o->object.size) - offsetof(Object, data.payload);
+
+ if (o->object.flags & OBJECT_COMPRESSED) {
+
+#ifdef HAVE_XZ
+ if (uncompress_startswith(o->data.payload, l,
+ &f->compress_buffer, &f->compress_buffer_size,
+ field, field_length, '=')) {
+
+ uint64_t rsize;
+
+ if (!uncompress_blob(o->data.payload, l,
+ &f->compress_buffer, &f->compress_buffer_size, &rsize))
+ return -EBADMSG;
+
+ *data = f->compress_buffer;
+ *size = (size_t) rsize;
+
+ return 0;
+ }
+#else
+ return -EPROTONOSUPPORT;
+#endif
+
+ } else if (l >= field_length+1 &&
+ memcmp(o->data.payload, field, field_length) == 0 &&
+ o->data.payload[field_length] == '=') {
+
+ t = (size_t) l;
+
+ if ((uint64_t) t != l)
+ return -E2BIG;
+
+ *data = o->data.payload;
+ *size = t;
+
+ return 0;
+ }
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
+ if (r < 0)
+ return r;
+ }
+
+ return -ENOENT;
+}
+
+static int return_data(JournalFile *f, Object *o, const void **data, size_t *size) {
+ size_t t;
+ uint64_t l;
+
+ l = le64toh(o->object.size) - offsetof(Object, data.payload);
+ t = (size_t) l;
+
+ /* We can't read objects larger than 4G on a 32bit machine */
+ if ((uint64_t) t != l)
+ return -E2BIG;
+
+ if (o->object.flags & OBJECT_COMPRESSED) {
+#ifdef HAVE_XZ
+ uint64_t rsize;
+
+ if (!uncompress_blob(o->data.payload, l, &f->compress_buffer, &f->compress_buffer_size, &rsize))
+ return -EBADMSG;
+
+ *data = f->compress_buffer;
+ *size = (size_t) rsize;
+#else
+ return -EPROTONOSUPPORT;
+#endif
+ } else {
+ *data = o->data.payload;
+ *size = t;
+ }
+
+ return 0;
+}
+
+_public_ int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) {
+ JournalFile *f;
+ uint64_t p, n;
+ le64_t le_hash;
+ int r;
+ Object *o;
+
+ if (!j)
+ return -EINVAL;
+ if (!data)
+ return -EINVAL;
+ if (!size)
+ return -EINVAL;
+
+ f = j->current_file;
+ if (!f)
+ return -EADDRNOTAVAIL;
+
+ if (f->current_offset <= 0)
+ return -EADDRNOTAVAIL;
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
+ if (r < 0)
+ return r;
+
+ n = journal_file_entry_n_items(o);
+ if (j->current_field >= n)
+ return 0;
+
+ p = le64toh(o->entry.items[j->current_field].object_offset);
+ le_hash = o->entry.items[j->current_field].hash;
+ r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
+ if (r < 0)
+ return r;
+
+ if (le_hash != o->data.hash)
+ return -EBADMSG;
+
+ r = return_data(f, o, data, size);
+ if (r < 0)
+ return r;
+
+ j->current_field ++;
+
+ return 1;
+}
+
+_public_ void sd_journal_restart_data(sd_journal *j) {
+ if (!j)
+ return;
+
+ j->current_field = 0;
+}
+
+_public_ int sd_journal_get_fd(sd_journal *j) {
+ int r;
+
+ if (!j)
+ return -EINVAL;
+
+ if (j->inotify_fd >= 0)
+ return j->inotify_fd;
+
+ r = allocate_inotify(j);
+ if (r < 0)
+ return r;
+
+ /* Iterate through all dirs again, to add them to the
+ * inotify */
+ if (j->path)
+ r = add_root_directory(j, j->path);
+ else
+ r = add_search_paths(j);
+ if (r < 0)
+ return r;
+
+ return j->inotify_fd;
+}
+
+static void process_inotify_event(sd_journal *j, struct inotify_event *e) {
+ Directory *d;
+ int r;
+
+ assert(j);
+ assert(e);
+
+ /* Is this a subdirectory we watch? */
+ d = hashmap_get(j->directories_by_wd, INT_TO_PTR(e->wd));
+ if (d) {
+ sd_id128_t id;
+
+ if (!(e->mask & IN_ISDIR) && e->len > 0 &&
+ (endswith(e->name, ".journal") ||
+ endswith(e->name, ".journal~"))) {
+
+ /* Event for a journal file */
+
+ if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
+ r = add_file(j, d->path, e->name);
+ if (r < 0)
+ log_debug("Failed to add file %s/%s: %s", d->path, e->name, strerror(-r));
+
+ } else if (e->mask & (IN_DELETE|IN_MOVED_FROM|IN_UNMOUNT)) {
+
+ r = remove_file(j, d->path, e->name);
+ if (r < 0)
+ log_debug("Failed to remove file %s/%s: %s", d->path, e->name, strerror(-r));
+ }
+
+ } else if (!d->is_root && e->len == 0) {
+
+ /* Event for a subdirectory */
+
+ if (e->mask & (IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT)) {
+ r = remove_directory(j, d);
+ if (r < 0)
+ log_debug("Failed to remove directory %s: %s", d->path, strerror(-r));
+ }
+
+
+ } else if (d->is_root && (e->mask & IN_ISDIR) && e->len > 0 && sd_id128_from_string(e->name, &id) >= 0) {
+
+ /* Event for root directory */
+
+ if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
+ r = add_directory(j, d->path, e->name);
+ if (r < 0)
+ log_debug("Failed to add directory %s/%s: %s", d->path, e->name, strerror(-r));
+ }
+ }
+
+ return;
+ }
+
+ if (e->mask & IN_IGNORED)
+ return;
+
+ log_warning("Unknown inotify event.");
+}
+
+static int determine_change(sd_journal *j) {
+ bool b;
+
+ assert(j);
+
+ b = j->current_invalidate_counter != j->last_invalidate_counter;
+ j->last_invalidate_counter = j->current_invalidate_counter;
+
+ return b ? SD_JOURNAL_INVALIDATE : SD_JOURNAL_APPEND;
+}
+
+_public_ int sd_journal_process(sd_journal *j) {
+ uint8_t buffer[sizeof(struct inotify_event) + FILENAME_MAX] _alignas_(struct inotify_event);
+ bool got_something = false;
+
+ if (!j)
+ return -EINVAL;
+
+ for (;;) {
+ struct inotify_event *e;
+ ssize_t l;
+
+ l = read(j->inotify_fd, buffer, sizeof(buffer));
+ if (l < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ return got_something ? determine_change(j) : SD_JOURNAL_NOP;
+
+ return -errno;
+ }
+
+ got_something = true;
+
+ e = (struct inotify_event*) buffer;
+ while (l > 0) {
+ size_t step;
+
+ process_inotify_event(j, e);
+
+ step = sizeof(struct inotify_event) + e->len;
+ assert(step <= (size_t) l);
+
+ e = (struct inotify_event*) ((uint8_t*) e + step);
+ l -= step;
+ }
+ }
+
+ return determine_change(j);
+}
+
+_public_ int sd_journal_wait(sd_journal *j, uint64_t timeout_usec) {
+ int r;
+
+ assert(j);
+
+ if (j->inotify_fd < 0) {
+
+ /* This is the first invocation, hence create the
+ * inotify watch */
+ r = sd_journal_get_fd(j);
+ if (r < 0)
+ return r;
+
+ /* The journal might have changed since the context
+ * object was created and we weren't watching before,
+ * hence don't wait for anything, and return
+ * immediately. */
+ return determine_change(j);
+ }
+
+ if (j->on_network) {
+ /* If we are on the network we need to regularly check
+ * for changes manually */
+
+ if (timeout_usec == (uint64_t) -1 || timeout_usec > JOURNAL_FILES_RECHECK_USEC)
+ timeout_usec = JOURNAL_FILES_RECHECK_USEC;
+ }
+
+ do {
+ r = fd_wait_for_event(j->inotify_fd, POLLIN, timeout_usec);
+ } while (r == -EINTR);
+
+ if (r < 0)
+ return r;
+
+ return sd_journal_process(j);
+}
+
+_public_ int sd_journal_get_cutoff_realtime_usec(sd_journal *j, uint64_t *from, uint64_t *to) {
+ Iterator i;
+ JournalFile *f;
+ bool first = true;
+ int r;
+
+ if (!j)
+ return -EINVAL;
+ if (!from && !to)
+ return -EINVAL;
+
+ HASHMAP_FOREACH(f, j->files, i) {
+ usec_t fr, t;
+
+ r = journal_file_get_cutoff_realtime_usec(f, &fr, &t);
+ if (r == -ENOENT)
+ continue;
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ if (first) {
+ if (from)
+ *from = fr;
+ if (to)
+ *to = t;
+ first = false;
+ } else {
+ if (from)
+ *from = MIN(fr, *from);
+ if (to)
+ *to = MAX(t, *to);
+ }
+ }
+
+ return first ? 0 : 1;
+}
+
+_public_ int sd_journal_get_cutoff_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t *from, uint64_t *to) {
+ Iterator i;
+ JournalFile *f;
+ bool first = true;
+ int r;
+
+ if (!j)
+ return -EINVAL;
+ if (!from && !to)
+ return -EINVAL;
+
+ HASHMAP_FOREACH(f, j->files, i) {
+ usec_t fr, t;
+
+ r = journal_file_get_cutoff_monotonic_usec(f, boot_id, &fr, &t);
+ if (r == -ENOENT)
+ continue;
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ if (first) {
+ if (from)
+ *from = fr;
+ if (to)
+ *to = t;
+ first = false;
+ } else {
+ if (from)
+ *from = MIN(fr, *from);
+ if (to)
+ *to = MAX(t, *to);
+ }
+ }
+
+ return first ? 0 : 1;
+}
+
+void journal_print_header(sd_journal *j) {
+ Iterator i;
+ JournalFile *f;
+ bool newline = false;
+
+ assert(j);
+
+ HASHMAP_FOREACH(f, j->files, i) {
+ if (newline)
+ putchar('\n');
+ else
+ newline = true;
+
+ journal_file_print_header(f);
+ }
+}
+
+_public_ int sd_journal_get_usage(sd_journal *j, uint64_t *bytes) {
+ Iterator i;
+ JournalFile *f;
+ uint64_t sum = 0;
+
+ if (!j)
+ return -EINVAL;
+ if (!bytes)
+ return -EINVAL;
+
+ HASHMAP_FOREACH(f, j->files, i) {
+ struct stat st;
+
+ if (fstat(f->fd, &st) < 0)
+ return -errno;
+
+ sum += (uint64_t) st.st_blocks * 512ULL;
+ }
+
+ *bytes = sum;
+ return 0;
+}
+
+_public_ int sd_journal_query_unique(sd_journal *j, const char *field) {
+ char *f;
+
+ if (!j)
+ return -EINVAL;
+ if (isempty(field))
+ return -EINVAL;
+ if (!field_is_valid(field))
+ return -EINVAL;
+
+ f = strdup(field);
+ if (!f)
+ return -ENOMEM;
+
+ free(j->unique_field);
+ j->unique_field = f;
+ j->unique_file = NULL;
+ j->unique_offset = 0;
+
+ return 0;
+}
+
+_public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l) {
+ Object *o;
+ size_t k;
+ int r;
+
+ if (!j)
+ return -EINVAL;
+ if (!data)
+ return -EINVAL;
+ if (!l)
+ return -EINVAL;
+ if (!j->unique_field)
+ return -EINVAL;
+
+ k = strlen(j->unique_field);
+
+ if (!j->unique_file) {
+ j->unique_file = hashmap_first(j->files);
+ if (!j->unique_file)
+ return 0;
+ j->unique_offset = 0;
+ }
+
+ for (;;) {
+ JournalFile *of;
+ Iterator i;
+ const void *odata;
+ size_t ol;
+ bool found;
+
+ /* Proceed to next data object in the field's linked list */
+ if (j->unique_offset == 0) {
+ r = journal_file_find_field_object(j->unique_file, j->unique_field, k, &o, NULL);
+ if (r < 0)
+ return r;
+
+ j->unique_offset = r > 0 ? le64toh(o->field.head_data_offset) : 0;
+ } else {
+ r = journal_file_move_to_object(j->unique_file, OBJECT_DATA, j->unique_offset, &o);
+ if (r < 0)
+ return r;
+
+ j->unique_offset = le64toh(o->data.next_field_offset);
+ }
+
+ /* We reached the end of the list? Then start again, with the next file */
+ if (j->unique_offset == 0) {
+ JournalFile *n;
+
+ n = hashmap_next(j->files, j->unique_file->path);
+ if (!n)
+ return 0;
+
+ j->unique_file = n;
+ continue;
+ }
+
+ /* We do not use the type context here, but 0 instead,
+ * so that we can look at this data object at the same
+ * time as one on another file */
+ r = journal_file_move_to_object(j->unique_file, 0, j->unique_offset, &o);
+ if (r < 0)
+ return r;
+
+ /* Let's do the type check by hand, since we used 0 context above. */
+ if (o->object.type != OBJECT_DATA)
+ return -EBADMSG;
+
+ r = return_data(j->unique_file, o, &odata, &ol);
+ if (r < 0)
+ return r;
+
+ /* OK, now let's see if we already returned this data
+ * object by checking if it exists in the earlier
+ * traversed files. */
+ found = false;
+ HASHMAP_FOREACH(of, j->files, i) {
+ Object *oo;
+ uint64_t op;
+
+ if (of == j->unique_file)
+ break;
+
+ /* Skip this file it didn't have any fields
+ * indexed */
+ if (JOURNAL_HEADER_CONTAINS(of->header, n_fields) &&
+ le64toh(of->header->n_fields) <= 0)
+ continue;
+
+ r = journal_file_find_data_object_with_hash(of, odata, ol, le64toh(o->data.hash), &oo, &op);
+ if (r < 0)
+ return r;
+
+ if (r > 0)
+ found = true;
+ }
+
+ if (found)
+ continue;
+
+ r = return_data(j->unique_file, o, data, l);
+ if (r < 0)
+ return r;
+
+ return 1;
+ }
+}
+
+_public_ void sd_journal_restart_unique(sd_journal *j) {
+ if (!j)
+ return;
+
+ j->unique_file = NULL;
+ j->unique_offset = 0;
+}
+
+_public_ int sd_journal_reliable_fd(sd_journal *j) {
+ if (!j)
+ return -EINVAL;
+
+ return !j->on_network;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-09-19 21:35:06 +0000