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-rw-r--r--src/journal/sd-journal.c3137
1 files changed, 3137 insertions, 0 deletions
diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
new file mode 100644
index 0000000..0f99628
--- /dev/null
+++ b/src/journal/sd-journal.c
@@ -0,0 +1,3137 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <linux/magic.h>
+#include <poll.h>
+#include <stddef.h>
+#include <sys/inotify.h>
+#include <sys/vfs.h>
+#include <unistd.h>
+
+#include "sd-journal.h"
+
+#include "alloc-util.h"
+#include "catalog.h"
+#include "compress.h"
+#include "dirent-util.h"
+#include "env-file.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "format-util.h"
+#include "fs-util.h"
+#include "hashmap.h"
+#include "hostname-util.h"
+#include "id128-util.h"
+#include "io-util.h"
+#include "journal-def.h"
+#include "journal-file.h"
+#include "journal-internal.h"
+#include "list.h"
+#include "lookup3.h"
+#include "missing.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "replace-var.h"
+#include "stat-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "strv.h"
+
+#define JOURNAL_FILES_MAX 7168
+
+#define JOURNAL_FILES_RECHECK_USEC (2 * USEC_PER_SEC)
+
+#define REPLACE_VAR_MAX 256
+
+#define DEFAULT_DATA_THRESHOLD (64*1024)
+
+static void remove_file_real(sd_journal *j, JournalFile *f);
+
+static bool journal_pid_changed(sd_journal *j) {
+ assert(j);
+
+ /* We don't support people creating a journal object and
+ * keeping it around over a fork(). Let's complain. */
+
+ return j->original_pid != getpid_cached();
+}
+
+static int journal_put_error(sd_journal *j, int r, const char *path) {
+ char *copy;
+ int k;
+
+ /* Memorize an error we encountered, and store which
+ * file/directory it was generated from. Note that we store
+ * only *one* path per error code, as the error code is the
+ * key into the hashmap, and the path is the value. This means
+ * we keep track only of all error kinds, but not of all error
+ * locations. This has the benefit that the hashmap cannot
+ * grow beyond bounds.
+ *
+ * We return an error here only if we didn't manage to
+ * memorize the real error. */
+
+ if (r >= 0)
+ return r;
+
+ k = hashmap_ensure_allocated(&j->errors, NULL);
+ if (k < 0)
+ return k;
+
+ if (path) {
+ copy = strdup(path);
+ if (!copy)
+ return -ENOMEM;
+ } else
+ copy = NULL;
+
+ k = hashmap_put(j->errors, INT_TO_PTR(r), copy);
+ if (k < 0) {
+ free(copy);
+
+ if (k == -EEXIST)
+ return 0;
+
+ return k;
+ }
+
+ return 0;
+}
+
+static void detach_location(sd_journal *j) {
+ Iterator i;
+ JournalFile *f;
+
+ assert(j);
+
+ j->current_file = NULL;
+ j->current_field = 0;
+
+ ORDERED_HASHMAP_FOREACH(f, j->files, i)
+ journal_file_reset_location(f);
+}
+
+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(IN_SET(type, LOCATION_DISCRETE, 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, JournalFile *f, Object *o) {
+ assert(j);
+ assert(f);
+ assert(o);
+
+ init_location(&j->current_location, LOCATION_DISCRETE, f, o);
+
+ j->current_file = f;
+ j->current_field = 0;
+
+ /* Let f know its candidate entry was picked. */
+ assert(f->location_type == LOCATION_SEEK);
+ f->location_type = LOCATION_DISCRETE;
+}
+
+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;
+ }
+
+ assert_not_reached("\"=\" not found");
+}
+
+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(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(matches, m->parent->matches, m);
+
+ free(m->data);
+ free(m);
+}
+
+static void match_free_if_empty(Match *m) {
+ if (!m || m->matches)
+ return;
+
+ match_free(m);
+}
+
+_public_ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
+ Match *l3, *l4, *add_here = NULL, *m;
+ le64_t le_hash;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(data, -EINVAL);
+
+ if (size == 0)
+ size = strlen(data);
+
+ assert_return(match_is_valid(data, size), -EINVAL);
+
+ /* level 0: AND term
+ * level 1: OR terms
+ * level 2: AND terms
+ * level 3: OR terms
+ * level 4: concrete matches */
+
+ if (!j->level0) {
+ j->level0 = match_new(NULL, MATCH_AND_TERM);
+ if (!j->level0)
+ return -ENOMEM;
+ }
+
+ if (!j->level1) {
+ j->level1 = match_new(j->level0, MATCH_OR_TERM);
+ if (!j->level1)
+ return -ENOMEM;
+ }
+
+ if (!j->level2) {
+ j->level2 = match_new(j->level1, MATCH_AND_TERM);
+ if (!j->level2)
+ return -ENOMEM;
+ }
+
+ assert(j->level0->type == MATCH_AND_TERM);
+ assert(j->level1->type == MATCH_OR_TERM);
+ assert(j->level2->type == MATCH_AND_TERM);
+
+ le_hash = htole64(hash64(data, size));
+
+ LIST_FOREACH(matches, l3, j->level2->matches) {
+ assert(l3->type == MATCH_OR_TERM);
+
+ LIST_FOREACH(matches, l4, l3->matches) {
+ assert(l4->type == MATCH_DISCRETE);
+
+ /* Exactly the same match already? Then ignore
+ * this addition */
+ if (l4->le_hash == le_hash &&
+ l4->size == size &&
+ memcmp(l4->data, data, size) == 0)
+ return 0;
+
+ /* Same field? Then let's add this to this OR term */
+ if (same_field(data, size, l4->data, l4->size)) {
+ add_here = l3;
+ break;
+ }
+ }
+
+ if (add_here)
+ break;
+ }
+
+ if (!add_here) {
+ add_here = match_new(j->level2, 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:
+ match_free_if_empty(add_here);
+ match_free_if_empty(j->level2);
+ match_free_if_empty(j->level1);
+ match_free_if_empty(j->level0);
+
+ return -ENOMEM;
+}
+
+_public_ int sd_journal_add_conjunction(sd_journal *j) {
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ if (!j->level0)
+ return 0;
+
+ if (!j->level1)
+ return 0;
+
+ if (!j->level1->matches)
+ return 0;
+
+ j->level1 = NULL;
+ j->level2 = NULL;
+
+ return 0;
+}
+
+_public_ int sd_journal_add_disjunction(sd_journal *j) {
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ if (!j->level0)
+ return 0;
+
+ if (!j->level1)
+ return 0;
+
+ if (!j->level2)
+ return 0;
+
+ if (!j->level2->matches)
+ return 0;
+
+ j->level2 = NULL;
+ return 0;
+}
+
+static char *match_make_string(Match *m) {
+ char *p = NULL, *r;
+ Match *i;
+ bool enclose = false;
+
+ if (!m)
+ return strdup("none");
+
+ if (m->type == MATCH_DISCRETE)
+ return cescape_length(m->data, m->size);
+
+ LIST_FOREACH(matches, i, m->matches) {
+ char *t, *k;
+
+ t = match_make_string(i);
+ if (!t)
+ return mfree(p);
+
+ if (p) {
+ k = strjoin(p, m->type == MATCH_OR_TERM ? " OR " : " AND ", t);
+ free(p);
+ free(t);
+
+ if (!k)
+ return NULL;
+
+ p = k;
+
+ enclose = true;
+ } else
+ p = t;
+ }
+
+ if (enclose) {
+ r = strjoin("(", p, ")");
+ 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 = j->level2 = NULL;
+
+ detach_location(j);
+}
+
+_pure_ static int compare_with_location(JournalFile *f, Location *l) {
+ int r;
+
+ assert(f);
+ assert(l);
+ assert(f->location_type == LOCATION_SEEK);
+ assert(IN_SET(l->type, LOCATION_DISCRETE, LOCATION_SEEK));
+
+ if (l->monotonic_set &&
+ sd_id128_equal(f->current_boot_id, l->boot_id) &&
+ l->realtime_set &&
+ f->current_realtime == l->realtime &&
+ l->xor_hash_set &&
+ f->current_xor_hash == l->xor_hash)
+ return 0;
+
+ if (l->seqnum_set &&
+ sd_id128_equal(f->header->seqnum_id, l->seqnum_id)) {
+
+ r = CMP(f->current_seqnum, l->seqnum);
+ if (r != 0)
+ return r;
+ }
+
+ if (l->monotonic_set &&
+ sd_id128_equal(f->current_boot_id, l->boot_id)) {
+
+ r = CMP(f->current_monotonic, l->monotonic);
+ if (r != 0)
+ return r;
+ }
+
+ if (l->realtime_set) {
+
+ r = CMP(f->current_realtime, l->realtime);
+ if (r != 0)
+ return r;
+ }
+
+ if (l->xor_hash_set) {
+
+ r = CMP(f->current_xor_hash, l->xor_hash);
+ if (r != 0)
+ return r;
+ }
+
+ 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 ? cp < np : cp > np))
+ np = cp;
+ }
+ }
+
+ if (np == 0)
+ return 0;
+
+ } else if (m->type == MATCH_AND_TERM) {
+ Match *i, *last_moved;
+
+ /* Always jump to the next matching entry and repeat
+ * this until we find an offset that matches for all
+ * matches. */
+
+ if (!m->matches)
+ return 0;
+
+ r = next_for_match(j, m->matches, f, after_offset, direction, NULL, &np);
+ if (r <= 0)
+ return r;
+
+ assert(direction == DIRECTION_DOWN ? np >= after_offset : np <= after_offset);
+ last_moved = m->matches;
+
+ LIST_LOOP_BUT_ONE(matches, i, m->matches, last_moved) {
+ uint64_t cp;
+
+ r = next_for_match(j, i, f, np, direction, NULL, &cp);
+ if (r <= 0)
+ return r;
+
+ assert(direction == DIRECTION_DOWN ? cp >= np : cp <= np);
+ if (direction == DIRECTION_DOWN ? cp > np : cp < np) {
+ np = cp;
+ last_moved = i;
+ }
+ }
+ }
+
+ assert(np > 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 ? cp > np : cp < np))
+ 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, 0, DIRECTION_DOWN, ret, offset);
+ if (j->current_location.type == LOCATION_TAIL)
+ return journal_file_next_entry(f, 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, 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) {
+
+ assert(j);
+ assert(f);
+ assert(ret);
+ assert(offset);
+
+ /* No matches is easy. We simple advance the file
+ * pointer by one. */
+ if (!j->level0)
+ return journal_file_next_entry(f, f->current_offset, 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 ? f->current_offset + 1
+ : f->current_offset - 1,
+ direction, ret, offset);
+}
+
+static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direction) {
+ Object *c;
+ uint64_t cp, n_entries;
+ int r;
+
+ assert(j);
+ assert(f);
+
+ n_entries = le64toh(f->header->n_entries);
+
+ /* If we hit EOF before, we don't need to look into this file again
+ * unless direction changed or new entries appeared. */
+ if (f->last_direction == direction && f->location_type == LOCATION_TAIL &&
+ n_entries == f->last_n_entries)
+ return 0;
+
+ f->last_n_entries = n_entries;
+
+ if (f->last_direction == direction && f->current_offset > 0) {
+ /* LOCATION_SEEK here means we did the work in a previous
+ * iteration and the current location already points to a
+ * candidate entry. */
+ if (f->location_type != LOCATION_SEEK) {
+ r = next_with_matches(j, f, direction, &c, &cp);
+ if (r <= 0)
+ return r;
+
+ journal_file_save_location(f, c, cp);
+ }
+ } else {
+ f->last_direction = direction;
+
+ r = find_location_with_matches(j, f, direction, &c, &cp);
+ if (r <= 0)
+ return r;
+
+ journal_file_save_location(f, c, cp);
+ }
+
+ /* OK, we found the spot, now let's advance until 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, &j->current_location);
+
+ found = direction == DIRECTION_DOWN ? k > 0 : k < 0;
+ } else
+ found = true;
+
+ if (found)
+ return 1;
+
+ r = next_with_matches(j, f, direction, &c, &cp);
+ if (r <= 0)
+ return r;
+
+ journal_file_save_location(f, c, cp);
+ }
+}
+
+static int real_journal_next(sd_journal *j, direction_t direction) {
+ JournalFile *new_file = NULL;
+ unsigned i, n_files;
+ const void **files;
+ Object *o;
+ int r;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ r = iterated_cache_get(j->files_cache, NULL, &files, &n_files);
+ if (r < 0)
+ return r;
+
+ for (i = 0; i < n_files; i++) {
+ JournalFile *f = (JournalFile *)files[i];
+ bool found;
+
+ r = next_beyond_location(j, f, direction);
+ if (r < 0) {
+ log_debug_errno(r, "Can't iterate through %s, ignoring: %m", f->path);
+ remove_file_real(j, f);
+ continue;
+ } else if (r == 0) {
+ f->location_type = LOCATION_TAIL;
+ continue;
+ }
+
+ if (!new_file)
+ found = true;
+ else {
+ int k;
+
+ k = journal_file_compare_locations(f, new_file);
+
+ found = direction == DIRECTION_DOWN ? k < 0 : k > 0;
+ }
+
+ if (found)
+ new_file = f;
+ }
+
+ if (!new_file)
+ return 0;
+
+ r = journal_file_move_to_object(new_file, OBJECT_ENTRY, new_file->current_offset, &o);
+ if (r < 0)
+ return r;
+
+ set_location(j, new_file, o);
+
+ 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;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ if (skip == 0) {
+ /* If this is not a discrete skip, then at least
+ * resolve the current location */
+ if (j->current_location.type != LOCATION_DISCRETE) {
+ r = real_journal_next(j, direction);
+ if (r < 0)
+ return r;
+ }
+
+ 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];
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(cursor, -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=%"PRIx64";b=%s;m=%"PRIx64";t=%"PRIx64";x=%"PRIx64,
+ sid, le64toh(o->entry.seqnum),
+ bid, le64toh(o->entry.monotonic),
+ le64toh(o->entry.realtime),
+ le64toh(o->entry.xor_hash)) < 0)
+ return -ENOMEM;
+
+ return 0;
+}
+
+_public_ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
+ const char *word, *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;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(!isempty(cursor), -EINVAL);
+
+ FOREACH_WORD_SEPARATOR(word, l, cursor, ";", state) {
+ char *item;
+ int k = 0;
+
+ if (l < 2 || word[1] != '=')
+ return -EINVAL;
+
+ item = strndup(word, l);
+ if (!item)
+ return -ENOMEM;
+
+ switch (word[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;
+ Object *o;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(!isempty(cursor), -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;
+
+ for (;;) {
+ _cleanup_free_ char *item = NULL;
+ unsigned long long ll;
+ sd_id128_t id;
+ int k = 0;
+
+ r = extract_first_word(&cursor, &item, ";", EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r < 0)
+ return r;
+
+ if (r == 0)
+ break;
+
+ if (strlen(item) < 2 || item[1] != '=')
+ return -EINVAL;
+
+ switch (item[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) {
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ 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) {
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ 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) {
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ reset_location(j);
+ j->current_location.type = LOCATION_HEAD;
+
+ return 0;
+}
+
+_public_ int sd_journal_seek_tail(sd_journal *j) {
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ reset_location(j);
+ j->current_location.type = LOCATION_TAIL;
+
+ return 0;
+}
+
+static void check_network(sd_journal *j, int fd) {
+ assert(j);
+
+ if (j->on_network)
+ return;
+
+ j->on_network = fd_is_network_fs(fd);
+}
+
+static bool file_has_type_prefix(const char *prefix, const char *filename) {
+ const char *full, *tilded, *atted;
+
+ full = strjoina(prefix, ".journal");
+ tilded = strjoina(full, "~");
+ atted = strjoina(prefix, "@");
+
+ return STR_IN_SET(filename, full, tilded) ||
+ startswith(filename, atted);
+}
+
+static bool file_type_wanted(int flags, const char *filename) {
+ assert(filename);
+
+ if (!endswith(filename, ".journal") && !endswith(filename, ".journal~"))
+ return false;
+
+ /* no flags set → every type is OK */
+ if (!(flags & (SD_JOURNAL_SYSTEM | SD_JOURNAL_CURRENT_USER)))
+ return true;
+
+ if (flags & SD_JOURNAL_SYSTEM && file_has_type_prefix("system", filename))
+ return true;
+
+ if (flags & SD_JOURNAL_CURRENT_USER) {
+ char prefix[5 + DECIMAL_STR_MAX(uid_t) + 1];
+
+ xsprintf(prefix, "user-"UID_FMT, getuid());
+
+ if (file_has_type_prefix(prefix, filename))
+ return true;
+ }
+
+ return false;
+}
+
+static bool path_has_prefix(sd_journal *j, const char *path, const char *prefix) {
+ assert(j);
+ assert(path);
+ assert(prefix);
+
+ if (j->toplevel_fd >= 0)
+ return false;
+
+ return path_startswith(path, prefix);
+}
+
+static void track_file_disposition(sd_journal *j, JournalFile *f) {
+ assert(j);
+ assert(f);
+
+ if (!j->has_runtime_files && path_has_prefix(j, f->path, "/run"))
+ j->has_runtime_files = true;
+ else if (!j->has_persistent_files && path_has_prefix(j, f->path, "/var"))
+ j->has_persistent_files = true;
+}
+
+static const char *skip_slash(const char *p) {
+
+ if (!p)
+ return NULL;
+
+ while (*p == '/')
+ p++;
+
+ return p;
+}
+
+static int add_any_file(
+ sd_journal *j,
+ int fd,
+ const char *path) {
+
+ bool close_fd = false;
+ JournalFile *f;
+ struct stat st;
+ int r, k;
+
+ assert(j);
+ assert(fd >= 0 || path);
+
+ if (fd < 0) {
+ if (j->toplevel_fd >= 0)
+ /* If there's a top-level fd defined make the path relative, explicitly, since otherwise
+ * openat() ignores the first argument. */
+
+ fd = openat(j->toplevel_fd, skip_slash(path), O_RDONLY|O_CLOEXEC|O_NONBLOCK);
+ else
+ fd = open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
+ if (fd < 0) {
+ r = log_debug_errno(errno, "Failed to open journal file %s: %m", path);
+ goto finish;
+ }
+
+ close_fd = true;
+
+ r = fd_nonblock(fd, false);
+ if (r < 0) {
+ r = log_debug_errno(errno, "Failed to turn off O_NONBLOCK for %s: %m", path);
+ goto finish;
+ }
+ }
+
+ if (fstat(fd, &st) < 0) {
+ r = log_debug_errno(errno, "Failed to fstat file '%s': %m", path);
+ goto finish;
+ }
+
+ r = stat_verify_regular(&st);
+ if (r < 0) {
+ log_debug_errno(r, "Refusing to open '%s', as it is not a regular file.", path);
+ goto finish;
+ }
+
+ f = ordered_hashmap_get(j->files, path);
+ if (f) {
+ if (f->last_stat.st_dev == st.st_dev &&
+ f->last_stat.st_ino == st.st_ino) {
+
+ /* We already track this file, under the same path and with the same device/inode numbers, it's
+ * hence really the same. Mark this file as seen in this generation. This is used to GC old
+ * files in process_q_overflow() to detect journal files that are still there and discern them
+ * from those which are gone. */
+
+ f->last_seen_generation = j->generation;
+ r = 0;
+ goto finish;
+ }
+
+ /* So we tracked a file under this name, but it has a different inode/device. In that case, it got
+ * replaced (probably due to rotation?), let's drop it hence from our list. */
+ remove_file_real(j, f);
+ f = NULL;
+ }
+
+ if (ordered_hashmap_size(j->files) >= JOURNAL_FILES_MAX) {
+ log_debug("Too many open journal files, not adding %s.", path);
+ r = -ETOOMANYREFS;
+ goto finish;
+ }
+
+ r = journal_file_open(fd, path, O_RDONLY, 0, false, 0, false, NULL, j->mmap, NULL, NULL, &f);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to open journal file %s: %m", path);
+ goto finish;
+ }
+
+ /* journal_file_dump(f); */
+
+ r = ordered_hashmap_put(j->files, f->path, f);
+ if (r < 0) {
+ f->close_fd = false; /* make sure journal_file_close() doesn't close the caller's fd (or our own). We'll let the caller do that, or ourselves */
+ (void) journal_file_close(f);
+ goto finish;
+ }
+
+ close_fd = false; /* the fd is now owned by the JournalFile object */
+
+ f->last_seen_generation = j->generation;
+
+ track_file_disposition(j, f);
+ check_network(j, f->fd);
+
+ j->current_invalidate_counter++;
+
+ log_debug("File %s added.", f->path);
+
+ r = 0;
+
+finish:
+ if (close_fd)
+ safe_close(fd);
+
+ if (r < 0) {
+ k = journal_put_error(j, r, path);
+ if (k < 0)
+ return k;
+ }
+
+ return r;
+}
+
+static int add_file_by_name(
+ sd_journal *j,
+ const char *prefix,
+ const char *filename) {
+
+ const char *path;
+
+ assert(j);
+ assert(prefix);
+ assert(filename);
+
+ if (j->no_new_files)
+ return 0;
+
+ if (!file_type_wanted(j->flags, filename))
+ return 0;
+
+ path = strjoina(prefix, "/", filename);
+ return add_any_file(j, -1, path);
+}
+
+static void remove_file_by_name(
+ sd_journal *j,
+ const char *prefix,
+ const char *filename) {
+
+ const char *path;
+ JournalFile *f;
+
+ assert(j);
+ assert(prefix);
+ assert(filename);
+
+ path = strjoina(prefix, "/", filename);
+ f = ordered_hashmap_get(j->files, path);
+ if (!f)
+ return;
+
+ remove_file_real(j, f);
+}
+
+static void remove_file_real(sd_journal *j, JournalFile *f) {
+ assert(j);
+ assert(f);
+
+ (void) ordered_hashmap_remove(j->files, f->path);
+
+ log_debug("File %s removed.", f->path);
+
+ if (j->current_file == f) {
+ j->current_file = NULL;
+ j->current_field = 0;
+ }
+
+ if (j->unique_file == f) {
+ /* Jump to the next unique_file or NULL if that one was last */
+ j->unique_file = ordered_hashmap_next(j->files, j->unique_file->path);
+ j->unique_offset = 0;
+ if (!j->unique_file)
+ j->unique_file_lost = true;
+ }
+
+ if (j->fields_file == f) {
+ j->fields_file = ordered_hashmap_next(j->files, j->fields_file->path);
+ j->fields_offset = 0;
+ if (!j->fields_file)
+ j->fields_file_lost = true;
+ }
+
+ (void) journal_file_close(f);
+
+ j->current_invalidate_counter++;
+}
+
+static int dirname_is_machine_id(const char *fn) {
+ sd_id128_t id, machine;
+ int r;
+
+ r = sd_id128_get_machine(&machine);
+ if (r < 0)
+ return r;
+
+ r = sd_id128_from_string(fn, &id);
+ if (r < 0)
+ return r;
+
+ return sd_id128_equal(id, machine);
+}
+
+static bool dirent_is_journal_file(const struct dirent *de) {
+ assert(de);
+
+ if (!IN_SET(de->d_type, DT_REG, DT_LNK, DT_UNKNOWN))
+ return false;
+
+ return endswith(de->d_name, ".journal") ||
+ endswith(de->d_name, ".journal~");
+}
+
+static bool dirent_is_id128_subdir(const struct dirent *de) {
+ assert(de);
+
+ if (!IN_SET(de->d_type, DT_DIR, DT_LNK, DT_UNKNOWN))
+ return false;
+
+ return id128_is_valid(de->d_name);
+}
+
+static int directory_open(sd_journal *j, const char *path, DIR **ret) {
+ DIR *d;
+
+ assert(j);
+ assert(path);
+ assert(ret);
+
+ if (j->toplevel_fd < 0)
+ d = opendir(path);
+ else
+ /* Open the specified directory relative to the toplevel fd. Enforce that the path specified is
+ * relative, by dropping the initial slash */
+ d = xopendirat(j->toplevel_fd, skip_slash(path), 0);
+ if (!d)
+ return -errno;
+
+ *ret = d;
+ return 0;
+}
+
+static int add_directory(sd_journal *j, const char *prefix, const char *dirname);
+
+static void directory_enumerate(sd_journal *j, Directory *m, DIR *d) {
+ struct dirent *de;
+
+ assert(j);
+ assert(m);
+ assert(d);
+
+ FOREACH_DIRENT_ALL(de, d, goto fail) {
+
+ if (dirent_is_journal_file(de))
+ (void) add_file_by_name(j, m->path, de->d_name);
+
+ if (m->is_root && dirent_is_id128_subdir(de))
+ (void) add_directory(j, m->path, de->d_name);
+ }
+
+ return;
+
+fail:
+ log_debug_errno(errno, "Failed to enumerate directory %s, ignoring: %m", m->path);
+}
+
+static void directory_watch(sd_journal *j, Directory *m, int fd, uint32_t mask) {
+ int r;
+
+ assert(j);
+ assert(m);
+ assert(fd >= 0);
+
+ /* Watch this directory if that's enabled and if it not being watched yet. */
+
+ if (m->wd > 0) /* Already have a watch? */
+ return;
+ if (j->inotify_fd < 0) /* Not watching at all? */
+ return;
+
+ m->wd = inotify_add_watch_fd(j->inotify_fd, fd, mask);
+ if (m->wd < 0) {
+ log_debug_errno(errno, "Failed to watch journal directory '%s', ignoring: %m", m->path);
+ return;
+ }
+
+ r = hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m);
+ if (r == -EEXIST)
+ log_debug_errno(r, "Directory '%s' already being watched under a different path, ignoring: %m", m->path);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to add watch for journal directory '%s' to hashmap, ignoring: %m", m->path);
+ (void) inotify_rm_watch(j->inotify_fd, m->wd);
+ m->wd = -1;
+ }
+}
+
+static int add_directory(sd_journal *j, const char *prefix, const char *dirname) {
+ _cleanup_free_ char *path = NULL;
+ _cleanup_closedir_ DIR *d = NULL;
+ Directory *m;
+ int r, k;
+
+ assert(j);
+ assert(prefix);
+
+ /* Adds a journal file directory to watch. If the directory is already tracked this updates the inotify watch
+ * and reenumerates directory contents */
+
+ if (dirname)
+ path = strjoin(prefix, "/", dirname);
+ else
+ path = strdup(prefix);
+ if (!path) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ log_debug("Considering directory '%s'.", path);
+
+ /* We consider everything local that is in a directory for the local machine ID, or that is stored in /run */
+ if ((j->flags & SD_JOURNAL_LOCAL_ONLY) &&
+ !((dirname && dirname_is_machine_id(dirname) > 0) || path_has_prefix(j, path, "/run")))
+ return 0;
+
+ r = directory_open(j, path, &d);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to open directory '%s': %m", path);
+ goto fail;
+ }
+
+ m = hashmap_get(j->directories_by_path, path);
+ if (!m) {
+ m = new0(Directory, 1);
+ if (!m) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ m->is_root = false;
+ m->path = path;
+
+ if (hashmap_put(j->directories_by_path, m->path, m) < 0) {
+ free(m);
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ path = NULL; /* avoid freeing in cleanup */
+ j->current_invalidate_counter++;
+
+ log_debug("Directory %s added.", m->path);
+
+ } else if (m->is_root)
+ return 0; /* Don't 'downgrade' from root directory */
+
+ m->last_seen_generation = j->generation;
+
+ directory_watch(j, m, dirfd(d),
+ 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 (!j->no_new_files)
+ directory_enumerate(j, m, d);
+
+ check_network(j, dirfd(d));
+
+ return 0;
+
+fail:
+ k = journal_put_error(j, r, path ?: prefix);
+ if (k < 0)
+ return k;
+
+ return r;
+}
+
+static int add_root_directory(sd_journal *j, const char *p, bool missing_ok) {
+
+ _cleanup_closedir_ DIR *d = NULL;
+ Directory *m;
+ int r, k;
+
+ assert(j);
+
+ /* Adds a root directory to our set of directories to use. If the root directory is already in the set, we
+ * update the inotify logic, and renumerate the directory entries. This call may hence be called to initially
+ * populate the set, as well as to update it later. */
+
+ if (p) {
+ /* If there's a path specified, use it. */
+
+ log_debug("Considering root directory '%s'.", p);
+
+ if ((j->flags & SD_JOURNAL_RUNTIME_ONLY) &&
+ !path_has_prefix(j, p, "/run"))
+ return -EINVAL;
+
+ if (j->prefix)
+ p = strjoina(j->prefix, p);
+
+ r = directory_open(j, p, &d);
+ if (r == -ENOENT && missing_ok)
+ return 0;
+ if (r < 0) {
+ log_debug_errno(r, "Failed to open root directory %s: %m", p);
+ goto fail;
+ }
+ } else {
+ int dfd;
+
+ /* If there's no path specified, then we use the top-level fd itself. We duplicate the fd here, since
+ * opendir() will take possession of the fd, and close it, which we don't want. */
+
+ p = "."; /* store this as "." in the directories hashmap */
+
+ dfd = fcntl(j->toplevel_fd, F_DUPFD_CLOEXEC, 3);
+ if (dfd < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ d = fdopendir(dfd);
+ if (!d) {
+ r = -errno;
+ safe_close(dfd);
+ goto fail;
+ }
+
+ rewinddir(d);
+ }
+
+ m = hashmap_get(j->directories_by_path, p);
+ if (!m) {
+ m = new0(Directory, 1);
+ if (!m) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ m->is_root = true;
+
+ m->path = strdup(p);
+ if (!m->path) {
+ free(m);
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ if (hashmap_put(j->directories_by_path, m->path, m) < 0) {
+ free(m->path);
+ free(m);
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ j->current_invalidate_counter++;
+
+ log_debug("Root directory %s added.", m->path);
+
+ } else if (!m->is_root)
+ return 0;
+
+ directory_watch(j, m, dirfd(d),
+ IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
+ IN_ONLYDIR);
+
+ if (!j->no_new_files)
+ directory_enumerate(j, m, d);
+
+ check_network(j, dirfd(d));
+
+ return 0;
+
+fail:
+ k = journal_put_error(j, r, p);
+ if (k < 0)
+ return k;
+
+ return r;
+}
+
+static void 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 removed.", d->path);
+ else
+ log_debug("Directory %s removed.", d->path);
+
+ free(d->path);
+ free(d);
+}
+
+static int add_search_paths(sd_journal *j) {
+
+ static 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)
+ (void) add_root_directory(j, p, true);
+
+ if (!(j->flags & SD_JOURNAL_LOCAL_ONLY))
+ (void) add_root_directory(j, "/var/log/journal/remote", true);
+
+ return 0;
+}
+
+static int add_current_paths(sd_journal *j) {
+ Iterator i;
+ JournalFile *f;
+
+ assert(j);
+ assert(j->no_new_files);
+
+ /* Simply adds all directories for files we have open as directories. We don't expect errors here, so we
+ * treat them as fatal. */
+
+ ORDERED_HASHMAP_FOREACH(f, j->files, i) {
+ _cleanup_free_ char *dir;
+ int r;
+
+ dir = dirname_malloc(f->path);
+ if (!dir)
+ return -ENOMEM;
+
+ r = add_directory(j, dir, NULL);
+ if (r < 0)
+ return r;
+ }
+
+ 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;
+ }
+
+ return hashmap_ensure_allocated(&j->directories_by_wd, NULL);
+}
+
+static sd_journal *journal_new(int flags, const char *path) {
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+
+ j = new0(sd_journal, 1);
+ if (!j)
+ return NULL;
+
+ j->original_pid = getpid_cached();
+ j->toplevel_fd = -1;
+ j->inotify_fd = -1;
+ j->flags = flags;
+ j->data_threshold = DEFAULT_DATA_THRESHOLD;
+
+ if (path) {
+ char *t;
+
+ t = strdup(path);
+ if (!t)
+ return NULL;
+
+ if (flags & SD_JOURNAL_OS_ROOT)
+ j->prefix = t;
+ else
+ j->path = t;
+ }
+
+ j->files = ordered_hashmap_new(&path_hash_ops);
+ if (!j->files)
+ return NULL;
+
+ j->files_cache = ordered_hashmap_iterated_cache_new(j->files);
+ j->directories_by_path = hashmap_new(&path_hash_ops);
+ j->mmap = mmap_cache_new();
+ if (!j->files_cache || !j->directories_by_path || !j->mmap)
+ return NULL;
+
+ return TAKE_PTR(j);
+}
+
+#define OPEN_ALLOWED_FLAGS \
+ (SD_JOURNAL_LOCAL_ONLY | \
+ SD_JOURNAL_RUNTIME_ONLY | \
+ SD_JOURNAL_SYSTEM | SD_JOURNAL_CURRENT_USER)
+
+_public_ int sd_journal_open(sd_journal **ret, int flags) {
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+ int r;
+
+ assert_return(ret, -EINVAL);
+ assert_return((flags & ~OPEN_ALLOWED_FLAGS) == 0, -EINVAL);
+
+ j = journal_new(flags, NULL);
+ if (!j)
+ return -ENOMEM;
+
+ r = add_search_paths(j);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(j);
+ return 0;
+}
+
+#define OPEN_CONTAINER_ALLOWED_FLAGS \
+ (SD_JOURNAL_LOCAL_ONLY | SD_JOURNAL_SYSTEM)
+
+_public_ int sd_journal_open_container(sd_journal **ret, const char *machine, int flags) {
+ _cleanup_free_ char *root = NULL, *class = NULL;
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+ char *p;
+ int r;
+
+ /* This is pretty much deprecated, people should use machined's OpenMachineRootDirectory() call instead in
+ * combination with sd_journal_open_directory_fd(). */
+
+ assert_return(machine, -EINVAL);
+ assert_return(ret, -EINVAL);
+ assert_return((flags & ~OPEN_CONTAINER_ALLOWED_FLAGS) == 0, -EINVAL);
+ assert_return(machine_name_is_valid(machine), -EINVAL);
+
+ p = strjoina("/run/systemd/machines/", machine);
+ r = parse_env_file(NULL, p,
+ "ROOT", &root,
+ "CLASS", &class);
+ if (r == -ENOENT)
+ return -EHOSTDOWN;
+ if (r < 0)
+ return r;
+ if (!root)
+ return -ENODATA;
+
+ if (!streq_ptr(class, "container"))
+ return -EIO;
+
+ j = journal_new(flags, root);
+ if (!j)
+ return -ENOMEM;
+
+ r = add_search_paths(j);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(j);
+ return 0;
+}
+
+#define OPEN_DIRECTORY_ALLOWED_FLAGS \
+ (SD_JOURNAL_OS_ROOT | \
+ SD_JOURNAL_SYSTEM | SD_JOURNAL_CURRENT_USER )
+
+_public_ int sd_journal_open_directory(sd_journal **ret, const char *path, int flags) {
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+ int r;
+
+ assert_return(ret, -EINVAL);
+ assert_return(path, -EINVAL);
+ assert_return((flags & ~OPEN_DIRECTORY_ALLOWED_FLAGS) == 0, -EINVAL);
+
+ j = journal_new(flags, path);
+ if (!j)
+ return -ENOMEM;
+
+ if (flags & SD_JOURNAL_OS_ROOT)
+ r = add_search_paths(j);
+ else
+ r = add_root_directory(j, path, false);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(j);
+ return 0;
+}
+
+_public_ int sd_journal_open_files(sd_journal **ret, const char **paths, int flags) {
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+ const char **path;
+ int r;
+
+ assert_return(ret, -EINVAL);
+ assert_return(flags == 0, -EINVAL);
+
+ j = journal_new(flags, NULL);
+ if (!j)
+ return -ENOMEM;
+
+ STRV_FOREACH(path, paths) {
+ r = add_any_file(j, -1, *path);
+ if (r < 0)
+ return r;
+ }
+
+ j->no_new_files = true;
+
+ *ret = TAKE_PTR(j);
+ return 0;
+}
+
+#define OPEN_DIRECTORY_FD_ALLOWED_FLAGS \
+ (SD_JOURNAL_OS_ROOT | \
+ SD_JOURNAL_SYSTEM | SD_JOURNAL_CURRENT_USER )
+
+_public_ int sd_journal_open_directory_fd(sd_journal **ret, int fd, int flags) {
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+ struct stat st;
+ int r;
+
+ assert_return(ret, -EINVAL);
+ assert_return(fd >= 0, -EBADF);
+ assert_return((flags & ~OPEN_DIRECTORY_FD_ALLOWED_FLAGS) == 0, -EINVAL);
+
+ if (fstat(fd, &st) < 0)
+ return -errno;
+
+ if (!S_ISDIR(st.st_mode))
+ return -EBADFD;
+
+ j = journal_new(flags, NULL);
+ if (!j)
+ return -ENOMEM;
+
+ j->toplevel_fd = fd;
+
+ if (flags & SD_JOURNAL_OS_ROOT)
+ r = add_search_paths(j);
+ else
+ r = add_root_directory(j, NULL, false);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(j);
+ return 0;
+}
+
+_public_ int sd_journal_open_files_fd(sd_journal **ret, int fds[], unsigned n_fds, int flags) {
+ Iterator iterator;
+ JournalFile *f;
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+ unsigned i;
+ int r;
+
+ assert_return(ret, -EINVAL);
+ assert_return(n_fds > 0, -EBADF);
+ assert_return(flags == 0, -EINVAL);
+
+ j = journal_new(flags, NULL);
+ if (!j)
+ return -ENOMEM;
+
+ for (i = 0; i < n_fds; i++) {
+ struct stat st;
+
+ if (fds[i] < 0) {
+ r = -EBADF;
+ goto fail;
+ }
+
+ if (fstat(fds[i], &st) < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ r = stat_verify_regular(&st);
+ if (r < 0)
+ goto fail;
+
+ r = add_any_file(j, fds[i], NULL);
+ if (r < 0)
+ goto fail;
+ }
+
+ j->no_new_files = true;
+ j->no_inotify = true;
+
+ *ret = TAKE_PTR(j);
+ return 0;
+
+fail:
+ /* If we fail, make sure we don't take possession of the files we managed to make use of successfully, and they
+ * remain open */
+ ORDERED_HASHMAP_FOREACH(f, j->files, iterator)
+ f->close_fd = false;
+
+ return r;
+}
+
+_public_ void sd_journal_close(sd_journal *j) {
+ Directory *d;
+
+ if (!j)
+ return;
+
+ sd_journal_flush_matches(j);
+
+ ordered_hashmap_free_with_destructor(j->files, journal_file_close);
+ iterated_cache_free(j->files_cache);
+
+ 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);
+
+ safe_close(j->inotify_fd);
+
+ if (j->mmap) {
+ log_debug("mmap cache statistics: %u hit, %u miss", mmap_cache_get_hit(j->mmap), mmap_cache_get_missed(j->mmap));
+ mmap_cache_unref(j->mmap);
+ }
+
+ hashmap_free_free(j->errors);
+
+ free(j->path);
+ free(j->prefix);
+ free(j->unique_field);
+ free(j->fields_buffer);
+ free(j);
+}
+
+_public_ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
+ Object *o;
+ JournalFile *f;
+ int r;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(ret, -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;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ 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;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(field, -EINVAL);
+ assert_return(data, -EINVAL);
+ assert_return(size, -EINVAL);
+ assert_return(field_is_valid(field), -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;
+ int compression;
+
+ 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);
+
+ compression = o->object.flags & OBJECT_COMPRESSION_MASK;
+ if (compression) {
+#if HAVE_XZ || HAVE_LZ4
+ r = decompress_startswith(compression,
+ o->data.payload, l,
+ &f->compress_buffer, &f->compress_buffer_size,
+ field, field_length, '=');
+ if (r < 0)
+ log_debug_errno(r, "Cannot decompress %s object of length %"PRIu64" at offset "OFSfmt": %m",
+ object_compressed_to_string(compression), l, p);
+ else if (r > 0) {
+
+ size_t rsize;
+
+ r = decompress_blob(compression,
+ o->data.payload, l,
+ &f->compress_buffer, &f->compress_buffer_size, &rsize,
+ j->data_threshold);
+ if (r < 0)
+ return r;
+
+ *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(sd_journal *j, JournalFile *f, Object *o, const void **data, size_t *size) {
+ size_t t;
+ uint64_t l;
+ int compression;
+
+ 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;
+
+ compression = o->object.flags & OBJECT_COMPRESSION_MASK;
+ if (compression) {
+#if HAVE_XZ || HAVE_LZ4
+ size_t rsize;
+ int r;
+
+ r = decompress_blob(compression,
+ o->data.payload, l, &f->compress_buffer,
+ &f->compress_buffer_size, &rsize, j->data_threshold);
+ if (r < 0)
+ return r;
+
+ *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;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(data, -EINVAL);
+ assert_return(size, -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(j, 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;
+}
+
+static int reiterate_all_paths(sd_journal *j) {
+ assert(j);
+
+ if (j->no_new_files)
+ return add_current_paths(j);
+
+ if (j->flags & SD_JOURNAL_OS_ROOT)
+ return add_search_paths(j);
+
+ if (j->toplevel_fd >= 0)
+ return add_root_directory(j, NULL, false);
+
+ if (j->path)
+ return add_root_directory(j, j->path, true);
+
+ return add_search_paths(j);
+}
+
+_public_ int sd_journal_get_fd(sd_journal *j) {
+ int r;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ if (j->no_inotify)
+ return -EMEDIUMTYPE;
+
+ if (j->inotify_fd >= 0)
+ return j->inotify_fd;
+
+ r = allocate_inotify(j);
+ if (r < 0)
+ return r;
+
+ log_debug("Reiterating files to get inotify watches established.");
+
+ /* Iterate through all dirs again, to add them to the inotify */
+ r = reiterate_all_paths(j);
+ if (r < 0)
+ return r;
+
+ return j->inotify_fd;
+}
+
+_public_ int sd_journal_get_events(sd_journal *j) {
+ int fd;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ fd = sd_journal_get_fd(j);
+ if (fd < 0)
+ return fd;
+
+ return POLLIN;
+}
+
+_public_ int sd_journal_get_timeout(sd_journal *j, uint64_t *timeout_usec) {
+ int fd;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(timeout_usec, -EINVAL);
+
+ fd = sd_journal_get_fd(j);
+ if (fd < 0)
+ return fd;
+
+ if (!j->on_network) {
+ *timeout_usec = (uint64_t) -1;
+ return 0;
+ }
+
+ /* If we are on the network we need to regularly check for
+ * changes manually */
+
+ *timeout_usec = j->last_process_usec + JOURNAL_FILES_RECHECK_USEC;
+ return 1;
+}
+
+static void process_q_overflow(sd_journal *j) {
+ JournalFile *f;
+ Directory *m;
+ Iterator i;
+
+ assert(j);
+
+ /* When the inotify queue overruns we need to enumerate and re-validate all journal files to bring our list
+ * back in sync with what's on disk. For this we pick a new generation counter value. It'll be assigned to all
+ * journal files we encounter. All journal files and all directories that don't carry it after reenumeration
+ * are subject for unloading. */
+
+ log_debug("Inotify queue overrun, reiterating everything.");
+
+ j->generation++;
+ (void) reiterate_all_paths(j);
+
+ ORDERED_HASHMAP_FOREACH(f, j->files, i) {
+
+ if (f->last_seen_generation == j->generation)
+ continue;
+
+ log_debug("File '%s' hasn't been seen in this enumeration, removing.", f->path);
+ remove_file_real(j, f);
+ }
+
+ HASHMAP_FOREACH(m, j->directories_by_path, i) {
+
+ if (m->last_seen_generation == j->generation)
+ continue;
+
+ if (m->is_root) /* Never GC root directories */
+ continue;
+
+ log_debug("Directory '%s' hasn't been seen in this enumeration, removing.", f->path);
+ remove_directory(j, m);
+ }
+
+ log_debug("Reiteration complete.");
+}
+
+static void process_inotify_event(sd_journal *j, struct inotify_event *e) {
+ Directory *d;
+
+ assert(j);
+ assert(e);
+
+ if (e->mask & IN_Q_OVERFLOW) {
+ process_q_overflow(j);
+ return;
+ }
+
+ /* Is this a subdirectory we watch? */
+ d = hashmap_get(j->directories_by_wd, INT_TO_PTR(e->wd));
+ if (d) {
+ 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))
+ (void) add_file_by_name(j, d->path, e->name);
+ else if (e->mask & (IN_DELETE|IN_MOVED_FROM|IN_UNMOUNT))
+ remove_file_by_name(j, d->path, e->name);
+
+ } else if (!d->is_root && e->len == 0) {
+
+ /* Event for a subdirectory */
+
+ if (e->mask & (IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT))
+ remove_directory(j, d);
+
+ } else if (d->is_root && (e->mask & IN_ISDIR) && e->len > 0 && id128_is_valid(e->name)) {
+
+ /* Event for root directory */
+
+ if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB))
+ (void) add_directory(j, d->path, e->name);
+ }
+
+ return;
+ }
+
+ if (e->mask & IN_IGNORED)
+ return;
+
+ log_debug("Unexpected 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) {
+ bool got_something = false;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ if (j->inotify_fd < 0) /* We have no inotify fd yet? Then there's noting to process. */
+ return 0;
+
+ j->last_process_usec = now(CLOCK_MONOTONIC);
+ j->last_invalidate_counter = j->current_invalidate_counter;
+
+ for (;;) {
+ union inotify_event_buffer buffer;
+ struct inotify_event *e;
+ ssize_t l;
+
+ l = read(j->inotify_fd, &buffer, sizeof(buffer));
+ if (l < 0) {
+ if (IN_SET(errno, EAGAIN, EINTR))
+ return got_something ? determine_change(j) : SD_JOURNAL_NOP;
+
+ return -errno;
+ }
+
+ got_something = true;
+
+ FOREACH_INOTIFY_EVENT(e, buffer, l)
+ process_inotify_event(j, e);
+ }
+}
+
+_public_ int sd_journal_wait(sd_journal *j, uint64_t timeout_usec) {
+ int r;
+ uint64_t t;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ 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);
+ }
+
+ r = sd_journal_get_timeout(j, &t);
+ if (r < 0)
+ return r;
+
+ if (t != (uint64_t) -1) {
+ usec_t n;
+
+ n = now(CLOCK_MONOTONIC);
+ t = t > n ? t - n : 0;
+
+ if (timeout_usec == (uint64_t) -1 || timeout_usec > t)
+ timeout_usec = t;
+ }
+
+ 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;
+ uint64_t fmin = 0, tmax = 0;
+ int r;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(from || to, -EINVAL);
+ assert_return(from != to, -EINVAL);
+
+ ORDERED_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) {
+ fmin = fr;
+ tmax = t;
+ first = false;
+ } else {
+ fmin = MIN(fr, fmin);
+ tmax = MAX(t, tmax);
+ }
+ }
+
+ if (from)
+ *from = fmin;
+ if (to)
+ *to = tmax;
+
+ 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 found = false;
+ int r;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(from || to, -EINVAL);
+ assert_return(from != to, -EINVAL);
+
+ ORDERED_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 (found) {
+ if (from)
+ *from = MIN(fr, *from);
+ if (to)
+ *to = MAX(t, *to);
+ } else {
+ if (from)
+ *from = fr;
+ if (to)
+ *to = t;
+ found = true;
+ }
+ }
+
+ return found;
+}
+
+void journal_print_header(sd_journal *j) {
+ Iterator i;
+ JournalFile *f;
+ bool newline = false;
+
+ assert(j);
+
+ ORDERED_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;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(bytes, -EINVAL);
+
+ ORDERED_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;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(!isempty(field), -EINVAL);
+ assert_return(field_is_valid(field), -EINVAL);
+
+ f = strdup(field);
+ if (!f)
+ return -ENOMEM;
+
+ free(j->unique_field);
+ j->unique_field = f;
+ j->unique_file = NULL;
+ j->unique_offset = 0;
+ j->unique_file_lost = false;
+
+ return 0;
+}
+
+_public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l) {
+ size_t k;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(data, -EINVAL);
+ assert_return(l, -EINVAL);
+ assert_return(j->unique_field, -EINVAL);
+
+ k = strlen(j->unique_field);
+
+ if (!j->unique_file) {
+ if (j->unique_file_lost)
+ return 0;
+
+ j->unique_file = ordered_hashmap_first(j->files);
+ if (!j->unique_file)
+ return 0;
+
+ j->unique_offset = 0;
+ }
+
+ for (;;) {
+ JournalFile *of;
+ Iterator i;
+ Object *o;
+ const void *odata;
+ size_t ol;
+ bool found;
+ int r;
+
+ /* 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) {
+ j->unique_file = ordered_hashmap_next(j->files, j->unique_file->path);
+ if (!j->unique_file)
+ return 0;
+
+ continue;
+ }
+
+ /* We do not use OBJECT_DATA context here, but OBJECT_UNUSED
+ * 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, OBJECT_UNUSED, 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 log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
+ "%s:offset " OFSfmt ": object has type %d, expected %d",
+ j->unique_file->path,
+ j->unique_offset,
+ o->object.type, OBJECT_DATA);
+
+ r = return_data(j, j->unique_file, o, &odata, &ol);
+ if (r < 0)
+ return r;
+
+ /* Check if we have at least the field name and "=". */
+ if (ol <= k)
+ return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
+ "%s:offset " OFSfmt ": object has size %zu, expected at least %zu",
+ j->unique_file->path,
+ j->unique_offset, ol, k + 1);
+
+ if (memcmp(odata, j->unique_field, k) || ((const char*) odata)[k] != '=')
+ return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
+ "%s:offset " OFSfmt ": object does not start with \"%s=\"",
+ j->unique_file->path,
+ j->unique_offset,
+ j->unique_field);
+
+ /* OK, now let's see if we already returned this data
+ * object by checking if it exists in the earlier
+ * traversed files. */
+ found = false;
+ ORDERED_HASHMAP_FOREACH(of, j->files, i) {
+ 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), NULL, NULL);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ found = true;
+ break;
+ }
+ }
+
+ if (found)
+ continue;
+
+ r = return_data(j, 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;
+ j->unique_file_lost = false;
+}
+
+_public_ int sd_journal_enumerate_fields(sd_journal *j, const char **field) {
+ int r;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(field, -EINVAL);
+
+ if (!j->fields_file) {
+ if (j->fields_file_lost)
+ return 0;
+
+ j->fields_file = ordered_hashmap_first(j->files);
+ if (!j->fields_file)
+ return 0;
+
+ j->fields_hash_table_index = 0;
+ j->fields_offset = 0;
+ }
+
+ for (;;) {
+ JournalFile *f, *of;
+ Iterator i;
+ uint64_t m;
+ Object *o;
+ size_t sz;
+ bool found;
+
+ f = j->fields_file;
+
+ if (j->fields_offset == 0) {
+ bool eof = false;
+
+ /* We are not yet positioned at any field. Let's pick the first one */
+ r = journal_file_map_field_hash_table(f);
+ if (r < 0)
+ return r;
+
+ m = le64toh(f->header->field_hash_table_size) / sizeof(HashItem);
+ for (;;) {
+ if (j->fields_hash_table_index >= m) {
+ /* Reached the end of the hash table, go to the next file. */
+ eof = true;
+ break;
+ }
+
+ j->fields_offset = le64toh(f->field_hash_table[j->fields_hash_table_index].head_hash_offset);
+
+ if (j->fields_offset != 0)
+ break;
+
+ /* Empty hash table bucket, go to next one */
+ j->fields_hash_table_index++;
+ }
+
+ if (eof) {
+ /* Proceed with next file */
+ j->fields_file = ordered_hashmap_next(j->files, f->path);
+ if (!j->fields_file) {
+ *field = NULL;
+ return 0;
+ }
+
+ j->fields_offset = 0;
+ j->fields_hash_table_index = 0;
+ continue;
+ }
+
+ } else {
+ /* We are already positioned at a field. If so, let's figure out the next field from it */
+
+ r = journal_file_move_to_object(f, OBJECT_FIELD, j->fields_offset, &o);
+ if (r < 0)
+ return r;
+
+ j->fields_offset = le64toh(o->field.next_hash_offset);
+ if (j->fields_offset == 0) {
+ /* Reached the end of the hash table chain */
+ j->fields_hash_table_index++;
+ continue;
+ }
+ }
+
+ /* We use OBJECT_UNUSED here, so that the iterator below doesn't remove our mmap window */
+ r = journal_file_move_to_object(f, OBJECT_UNUSED, j->fields_offset, &o);
+ if (r < 0)
+ return r;
+
+ /* Because we used OBJECT_UNUSED above, we need to do our type check manually */
+ if (o->object.type != OBJECT_FIELD)
+ return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
+ "%s:offset " OFSfmt ": object has type %i, expected %i",
+ f->path, j->fields_offset,
+ o->object.type, OBJECT_FIELD);
+
+ sz = le64toh(o->object.size) - offsetof(Object, field.payload);
+
+ /* Let's see if we already returned this field name before. */
+ found = false;
+ ORDERED_HASHMAP_FOREACH(of, j->files, i) {
+ if (of == f)
+ 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_field_object_with_hash(of, o->field.payload, sz, le64toh(o->field.hash), NULL, NULL);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ found = true;
+ break;
+ }
+ }
+
+ if (found)
+ continue;
+
+ /* Check if this is really a valid string containing no NUL byte */
+ if (memchr(o->field.payload, 0, sz))
+ return -EBADMSG;
+
+ if (sz > j->data_threshold)
+ sz = j->data_threshold;
+
+ if (!GREEDY_REALLOC(j->fields_buffer, j->fields_buffer_allocated, sz + 1))
+ return -ENOMEM;
+
+ memcpy(j->fields_buffer, o->field.payload, sz);
+ j->fields_buffer[sz] = 0;
+
+ if (!field_is_valid(j->fields_buffer))
+ return -EBADMSG;
+
+ *field = j->fields_buffer;
+ return 1;
+ }
+}
+
+_public_ void sd_journal_restart_fields(sd_journal *j) {
+ if (!j)
+ return;
+
+ j->fields_file = NULL;
+ j->fields_hash_table_index = 0;
+ j->fields_offset = 0;
+ j->fields_file_lost = false;
+}
+
+_public_ int sd_journal_reliable_fd(sd_journal *j) {
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ return !j->on_network;
+}
+
+static char *lookup_field(const char *field, void *userdata) {
+ sd_journal *j = userdata;
+ const void *data;
+ size_t size, d;
+ int r;
+
+ assert(field);
+ assert(j);
+
+ r = sd_journal_get_data(j, field, &data, &size);
+ if (r < 0 ||
+ size > REPLACE_VAR_MAX)
+ return strdup(field);
+
+ d = strlen(field) + 1;
+
+ return strndup((const char*) data + d, size - d);
+}
+
+_public_ int sd_journal_get_catalog(sd_journal *j, char **ret) {
+ const void *data;
+ size_t size;
+ sd_id128_t id;
+ _cleanup_free_ char *text = NULL, *cid = NULL;
+ char *t;
+ int r;
+
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(ret, -EINVAL);
+
+ r = sd_journal_get_data(j, "MESSAGE_ID", &data, &size);
+ if (r < 0)
+ return r;
+
+ cid = strndup((const char*) data + 11, size - 11);
+ if (!cid)
+ return -ENOMEM;
+
+ r = sd_id128_from_string(cid, &id);
+ if (r < 0)
+ return r;
+
+ r = catalog_get(CATALOG_DATABASE, id, &text);
+ if (r < 0)
+ return r;
+
+ t = replace_var(text, lookup_field, j);
+ if (!t)
+ return -ENOMEM;
+
+ *ret = t;
+ return 0;
+}
+
+_public_ int sd_journal_get_catalog_for_message_id(sd_id128_t id, char **ret) {
+ assert_return(ret, -EINVAL);
+
+ return catalog_get(CATALOG_DATABASE, id, ret);
+}
+
+_public_ int sd_journal_set_data_threshold(sd_journal *j, size_t sz) {
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+
+ j->data_threshold = sz;
+ return 0;
+}
+
+_public_ int sd_journal_get_data_threshold(sd_journal *j, size_t *sz) {
+ assert_return(j, -EINVAL);
+ assert_return(!journal_pid_changed(j), -ECHILD);
+ assert_return(sz, -EINVAL);
+
+ *sz = j->data_threshold;
+ return 0;
+}
+
+_public_ int sd_journal_has_runtime_files(sd_journal *j) {
+ assert_return(j, -EINVAL);
+
+ return j->has_runtime_files;
+}
+
+_public_ int sd_journal_has_persistent_files(sd_journal *j) {
+ assert_return(j, -EINVAL);
+
+ return j->has_persistent_files;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 10:34:11 +0000