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Systemd/src/journal/sd-journal.c

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/***
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 <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 "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "fs-util.h"
#include "hashmap.h"
#include "hostname-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 "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 strndup(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) {
assert(f);
assert(l);
assert(f->location_type == LOCATION_SEEK);
assert(l->type == LOCATION_DISCRETE || l->type == 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)) {
if (f->current_seqnum < l->seqnum)
return -1;
if (f->current_seqnum > l->seqnum)
return 1;
}
if (l->monotonic_set &&
sd_id128_equal(f->current_boot_id, l->boot_id)) {
if (f->current_monotonic < l->monotonic)
return -1;
if (f->current_monotonic > l->monotonic)
return 1;
}
if (l->realtime_set) {
if (f->current_realtime < l->realtime)
return -1;
if (f->current_realtime > l->realtime)
return 1;
}
if (l->xor_hash_set) {
if (f->current_xor_hash < l->xor_hash)
return -1;
if (f->current_xor_hash > 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 ? 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 *f, *new_file = NULL;
Iterator i;
Object *o;
int r;
assert_return(j, -EINVAL);
assert_return(!journal_pid_changed(j), -ECHILD);
ORDERED_HASHMAP_FOREACH(f, j->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) {
struct statfs sfs;
assert(j);
if (j->on_network)
return;
if (fstatfs(fd, &sfs) < 0)
return;
j->on_network =
F_TYPE_EQUAL(sfs.f_type, CIFS_MAGIC_NUMBER) ||
F_TYPE_EQUAL(sfs.f_type, CODA_SUPER_MAGIC) ||
F_TYPE_EQUAL(sfs.f_type, NCP_SUPER_MAGIC) ||
F_TYPE_EQUAL(sfs.f_type, NFS_SUPER_MAGIC) ||
F_TYPE_EQUAL(sfs.f_type, SMB_SUPER_MAGIC);
}
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 streq(filename, full) ||
streq(filename, 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 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) {
JournalFile *f = NULL;
bool close_fd = false;
int r, k;
assert(j);
assert(fd >= 0 || path);
if (path && ordered_hashmap_get(j->files, path))
return 0;
if (ordered_hashmap_size(j->files) >= JOURNAL_FILES_MAX) {
log_debug("Too many open journal files, not adding %s.", path);
r = -ETOOMANYREFS;
goto fail;
}
if (fd < 0 && j->toplevel_fd >= 0) {
/* If there's a top-level fd defined, open the file relative to this now. (Make the path relative,
* explicitly, since otherwise openat() ignores the first argument.) */
fd = openat(j->toplevel_fd, skip_slash(path), O_RDONLY|O_CLOEXEC);
if (fd < 0) {
r = log_debug_errno(errno, "Failed to open journal file %s: %m", path);
goto fail;
}
close_fd = true;
}
r = journal_file_open(fd, path, O_RDONLY, 0, false, false, NULL, j->mmap, NULL, NULL, &f);
if (r < 0) {
if (close_fd)
safe_close(fd);
log_debug_errno(r, "Failed to open journal file %s: %m", path);
goto fail;
}
/* journal_file_dump(f); */
r = ordered_hashmap_put(j->files, f->path, f);
if (r < 0) {
f->close_fd = close_fd;
(void) journal_file_close(f);
goto fail;
}
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;
log_debug("File %s added.", f->path);
check_network(j, f->fd);
j->current_invalidate_counter++;
return 0;
fail:
k = journal_put_error(j, r, path);
if (k < 0)
return k;
return r;
}
static int add_file(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(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);
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 int add_directory(sd_journal *j, const char *prefix, const char *dirname) {
_cleanup_free_ char *path = NULL;
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de = 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;
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) {
r = log_debug_errno(errno, "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;
if (m->wd <= 0 && j->inotify_fd >= 0) {
/* Watch this directory, if it not being watched yet. */
m->wd = inotify_add_watch_fd(j->inotify_fd, 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 (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0)
inotify_rm_watch(j->inotify_fd, m->wd);
}
FOREACH_DIRENT_ALL(de, d, r = log_debug_errno(errno, "Failed to read directory %s: %m", m->path); goto fail) {
if (dirent_is_file_with_suffix(de, ".journal") ||
dirent_is_file_with_suffix(de, ".journal~"))
(void) add_file(j, m->path, de->d_name);
}
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;
struct dirent *de;
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. */
if ((j->flags & SD_JOURNAL_RUNTIME_ONLY) &&
!path_has_prefix(j, p, "/run"))
return -EINVAL;
if (j->prefix)
p = strjoina(j->prefix, p);
if (j->toplevel_fd < 0)
d = opendir(p);
else
d = xopendirat(j->toplevel_fd, skip_slash(p), 0);
if (!d) {
if (errno == ENOENT && missing_ok)
return 0;
r = log_debug_errno(errno, "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;
if (m->wd <= 0 && j->inotify_fd >= 0) {
m->wd = inotify_add_watch_fd(j->inotify_fd, dirfd(d),
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);
}
if (j->no_new_files)
return 0;
FOREACH_DIRENT_ALL(de, d, r = log_debug_errno(errno, "Failed to read directory %s: %m", m->path); goto fail) {
sd_id128_t id;
if (dirent_is_file_with_suffix(de, ".journal") ||
dirent_is_file_with_suffix(de, ".journal~"))
(void) add_file(j, m->path, de->d_name);
else if (IN_SET(de->d_type, DT_DIR, DT_LNK, DT_UNKNOWN) &&
sd_id128_from_string(de->d_name, &id) >= 0)
(void) add_directory(j, m->path, de->d_name);
}
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) {
sd_journal *j;
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)
goto fail;
if (flags & SD_JOURNAL_OS_ROOT)
j->prefix = t;
else
j->path = t;
}
j->files = ordered_hashmap_new(&string_hash_ops);
j->directories_by_path = hashmap_new(&string_hash_ops);
j->mmap = mmap_cache_new();
if (!j->files || !j->directories_by_path || !j->mmap)
goto fail;
return j;
fail:
sd_journal_close(j);
return NULL;
}
#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) {
sd_journal *j;
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)
goto fail;
*ret = j;
return 0;
fail:
sd_journal_close(j);
return r;
}
#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;
sd_journal *j;
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(p, NEWLINE, "ROOT", &root, "CLASS", &class, NULL);
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)
goto fail;
*ret = j;
return 0;
fail:
sd_journal_close(j);
return r;
}
#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) {
sd_journal *j;
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)
goto fail;
*ret = j;
return 0;
fail:
sd_journal_close(j);
return r;
}
_public_ int sd_journal_open_files(sd_journal **ret, const char **paths, int flags) {
sd_journal *j;
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)
goto fail;
}
j->no_new_files = true;
*ret = j;
return 0;
fail:
sd_journal_close(j);
return r;
}
#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) {
sd_journal *j;
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)
goto fail;
*ret = j;
return 0;
fail:
sd_journal_close(j);
return r;
}
_public_ int sd_journal_open_files_fd(sd_journal **ret, int fds[], unsigned n_fds, int flags) {
Iterator iterator;
JournalFile *f;
sd_journal *j;
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;
}
if (!S_ISREG(st.st_mode)) {
r = -EBADFD;
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 = 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;
sd_journal_close(j);
return r;
}
_public_ void sd_journal_close(sd_journal *j) {
Directory *d;
JournalFile *f;
char *p;
if (!j)
return;
sd_journal_flush_matches(j);
while ((f = ordered_hashmap_steal_first(j->files)))
(void) journal_file_close(f);
ordered_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);
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);
}
while ((p = hashmap_steal_first(j->errors)))
free(p);
hashmap_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;
}
_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 */
if (j->no_new_files)
r = add_current_paths(j);
else if (j->flags & SD_JOURNAL_OS_ROOT)
r = add_search_paths(j);
else if (j->toplevel_fd >= 0)
r = add_root_directory(j, NULL, false);
else if (j->path)
r = add_root_directory(j, j->path, true);
else
r = add_search_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_inotify_event(sd_journal *j, struct inotify_event *e) {
Directory *d;
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))
(void) add_file(j, d->path, e->name);
else if (e->mask & (IN_DELETE|IN_MOVED_FROM|IN_UNMOUNT))
remove_file(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 && sd_id128_from_string(e->name, &id) >= 0) {
/* 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("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) {
bool got_something = false;
assert_return(j, -EINVAL);
assert_return(!journal_pid_changed(j), -ECHILD);
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) {
log_debug("%s:offset " OFSfmt ": object has type %d, expected %d",
j->unique_file->path, j->unique_offset,
o->object.type, OBJECT_DATA);
return -EBADMSG;
}
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) {
log_debug("%s:offset " OFSfmt ": object has size %zu, expected at least %zu",
j->unique_file->path, j->unique_offset,
ol, k + 1);
return -EBADMSG;
}
if (memcmp(odata, j->unique_field, k) || ((const char*) odata)[k] != '=') {
log_debug("%s:offset " OFSfmt ": object does not start with \"%s=\"",
j->unique_file->path, j->unique_offset,
j->unique_field);
return -EBADMSG;
}
/* 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) {
log_debug("%s:offset " OFSfmt ": object has type %i, expected %i", f->path, j->fields_offset, o->object.type, OBJECT_FIELD);
return -EBADMSG;
}
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;
}
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