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third-party-mirror / systemd / refs/heads/master / . / src / libsystemd / sd-journal / sd-journal.c
blob: 9947947ef2b8aa3a9bfc7018fa73b10ceb4cc503 [file] [log] [blame]
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#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 "inotify-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 "nulstr-util.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"
#include "syslog-util.h"
#define JOURNAL_FILES_RECHECK_USEC (2 * USEC_PER_SEC)
/* The maximum size of variable values we'll expand in catalog entries. We bind this to PATH_MAX for now, as
* we want to be able to show all officially valid paths at least */
#define REPLACE_VAR_MAX PATH_MAX
#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) {
_cleanup_free_ char *copy = NULL;
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;
if (path) {
copy = strdup(path);
if (!copy)
return -ENOMEM;
}
k = hashmap_ensure_put(&j->errors, NULL, INT_TO_PTR(r), copy);
if (k < 0) {
if (k == -EEXIST)
return 0;
return k;
}
TAKE_PTR(copy);
return 0;
}
static void detach_location(sd_journal *j) {
JournalFile *f;
assert(j);
j->current_file = NULL;
j->current_field = 0;
ORDERED_HASHMAP_FOREACH(f, j->files)
journal_file_reset_location(f);
}
static void init_location(Location *l, LocationType type, JournalFile *f, Object *o) {
assert(l);
assert(IN_SET(type, LOCATION_DISCRETE, LOCATION_SEEK));
assert(f);
*l = (Location) {
.type = type,
.seqnum = le64toh(o->entry.seqnum),
.seqnum_id = f->header->seqnum_id,
.realtime = le64toh(o->entry.realtime),
.monotonic = le64toh(o->entry.monotonic),
.boot_id = o->entry.boot_id,
.xor_hash = le64toh(o->entry.xor_hash),
.seqnum_set = true,
.realtime_set = true,
.monotonic_set = true,
.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 = ASSERT_PTR(data);
if (size < 2)
return false;
if (((char*) data)[0] == '_' && ((char*) data)[1] == '_')
return false;
for (const char *p = b; p < b + size; p++) {
if (*p == '=')
return p > b;
if (*p == '_')
continue;
if (*p >= 'A' && *p <= 'Z')
continue;
if (ascii_isdigit(*p))
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;
for (size_t j = 0; j < s && j < t; j++) {
if (a[j] != b[j])
return false;
if (a[j] == '=')
return true;
}
assert_not_reached();
}
static Match *match_new(Match *p, MatchType t) {
Match *m;
m = new(Match, 1);
if (!m)
return NULL;
*m = (Match) {
.type = t,
.parent = p,
};
if (p)
LIST_PREPEND(matches, p->matches, m);
return m;
}
static Match *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);
return mfree(m);
}
static Match *match_free_if_empty(Match *m) {
if (!m || m->matches)
return m;
return match_free(m);
}
_public_ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
Match *add_here = NULL, *m = NULL;
uint64_t 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);
/* Old-style Jenkins (unkeyed) hashing only here. We do not cover new-style siphash (keyed) hashing
* here, since it's different for each file, and thus can't be pre-calculated in the Match object. */
hash = jenkins_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->hash == 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->hash = hash;
m->size = size;
m->data = memdup(data, size);
if (!m->data)
goto fail;
detach_location(j);
return 0;
fail:
match_free(m);
match_free_if_empty(add_here);
j->level2 = match_free_if_empty(j->level2);
j->level1 = match_free_if_empty(j->level1);
j->level0 = 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) {
_cleanup_free_ char *p = NULL;
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) {
_cleanup_free_ char *t = NULL;
t = match_make_string(i);
if (!t)
return NULL;
if (p) {
if (!strextend(&p, m->type == MATCH_OR_TERM ? " OR " : " AND ", t))
return NULL;
enclose = true;
} else
p = TAKE_PTR(t);
}
if (enclose)
return strjoin("(", p, ")");
return TAKE_PTR(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(const JournalFile *f, const Location *l, const JournalFile *current_file) {
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 &&
l->seqnum_set &&
sd_id128_equal(f->header->seqnum_id, l->seqnum_id) &&
f->current_seqnum == l->seqnum &&
f != current_file)
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;
assert(j);
assert(m);
assert(f);
if (m->type == MATCH_DISCRETE) {
Object *d;
uint64_t hash;
/* If the keyed hash logic is used, we need to calculate the hash fresh per file. Otherwise
* we can use what we pre-calculated. */
if (JOURNAL_HEADER_KEYED_HASH(f->header))
hash = journal_file_hash_data(f, m->data, m->size);
else
hash = m->hash;
r = journal_file_find_data_object_with_hash(f, m->data, m->size, hash, &d, NULL);
if (r <= 0)
return r;
return journal_file_move_to_entry_by_offset_for_data(f, d, after_offset, direction, ret, offset);
} else if (m->type == MATCH_OR_TERM) {
/* 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 *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);
if (ret) {
r = journal_file_move_to_object(f, OBJECT_ENTRY, np, ret);
if (r < 0)
return r;
}
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) {
Object *d;
uint64_t dp, hash;
if (JOURNAL_HEADER_KEYED_HASH(f->header))
hash = journal_file_hash_data(f, m->data, m->size);
else
hash = m->hash;
r = journal_file_find_data_object_with_hash(f, m->data, m->size, hash, &d, &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, d, DIRECTION_DOWN, ret, offset);
if (j->current_location.type == LOCATION_TAIL)
return journal_file_next_entry_for_data(f, d, 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, d, j->current_location.seqnum, direction, ret, offset);
if (j->current_location.monotonic_set) {
r = journal_file_move_to_entry_by_monotonic_for_data(f, d, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
if (r != -ENOENT)
return r;
/* The data object might have been invalidated. */
r = journal_file_move_to_object(f, OBJECT_DATA, dp, &d);
if (r < 0)
return r;
}
if (j->current_location.realtime_set)
return journal_file_move_to_entry_by_realtime_for_data(f, d, j->current_location.realtime, direction, ret, offset);
return journal_file_next_entry_for_data(f, d, direction, ret, offset);
} else if (m->type == MATCH_OR_TERM) {
uint64_t np = 0;
/* 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;
if (ret) {
r = journal_file_move_to_object(f, OBJECT_ENTRY, np, ret);
if (r < 0)
return r;
}
if (offset)
*offset = np;
return 1;
} else {
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, j->current_file);
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 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 (unsigned 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);
assert_return(skip <= INT_MAX, -ERANGE);
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;
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;
if (asprintf(cursor,
"s=%s;i=%"PRIx64";b=%s;m=%"PRIx64";t=%"PRIx64";x=%"PRIx64,
SD_ID128_TO_STRING(j->current_file->header->seqnum_id), le64toh(o->entry.seqnum),
SD_ID128_TO_STRING(o->entry.boot_id), 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) {
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;
int r;
assert_return(j, -EINVAL);
assert_return(!journal_pid_changed(j), -ECHILD);
assert_return(!isempty(cursor), -EINVAL);
for (const char *p = cursor;;) {
_cleanup_free_ char *word = NULL;
r = extract_first_word(&p, &word, ";", EXTRACT_DONT_COALESCE_SEPARATORS);
if (r < 0)
return r;
if (r == 0)
break;
if (word[0] == '\0' || word[1] != '=')
return -EINVAL;
switch (word[0]) {
case 's':
seqnum_id_set = true;
r = sd_id128_from_string(word + 2, &seqnum_id);
if (r < 0)
return r;
break;
case 'i':
seqnum_set = true;
if (sscanf(word + 2, "%llx", &seqnum) != 1)
return -EINVAL;
break;
case 'b':
boot_id_set = true;
r = sd_id128_from_string(word + 2, &boot_id);
if (r < 0)
return r;
break;
case 'm':
monotonic_set = true;
if (sscanf(word + 2, "%llx", &monotonic) != 1)
return -EINVAL;
break;
case 't':
realtime_set = true;
if (sscanf(word + 2, "%llx", &realtime) != 1)
return -EINVAL;
break;
case 'x':
xor_hash_set = true;
if (sscanf(word + 2, "%llx", &xor_hash) != 1)
return -EINVAL;
break;
}
}
if ((!seqnum_set || !seqnum_id_set) &&
(!monotonic_set || !boot_id_set) &&
!realtime_set)
return -EINVAL;
detach_location(j);
j->current_location = (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);
detach_location(j);
j->current_location = (Location) {
.type = LOCATION_SEEK,
.boot_id = boot_id,
.monotonic = usec,
.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);
detach_location(j);
j->current_location = (Location) {
.type = LOCATION_SEEK,
.realtime = usec,
.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);
detach_location(j);
j->current_location = (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);
detach_location(j);
j->current_location = (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) {
_cleanup_close_ int our_fd = -EBADF;
JournalFile *f;
struct stat st;
int r;
assert(j);
assert(fd >= 0 || path);
if (fd < 0) {
assert(path); /* For gcc. */
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 = our_fd = openat(j->toplevel_fd, skip_slash(path), O_RDONLY|O_CLOEXEC|O_NONBLOCK);
else
fd = our_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 error;
}
r = fd_nonblock(fd, false);
if (r < 0) {
r = log_debug_errno(errno, "Failed to turn off O_NONBLOCK for %s: %m", path);
goto error;
}
}
if (fstat(fd, &st) < 0) {
r = log_debug_errno(errno, "Failed to fstat %s: %m", path ?: "fd");
goto error;
}
r = stat_verify_regular(&st);
if (r < 0) {
log_debug_errno(r, "Refusing to open %s: %m", path ?: "fd");
goto error;
}
if (path) {
f = ordered_hashmap_get(j->files, path);
if (f) {
if (stat_inode_same(&f->last_stat, &st)) {
/* 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;
return 0;
}
/* 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) {
r = log_debug_errno(SYNTHETIC_ERRNO(ETOOMANYREFS),
"Too many open journal files, not adding %s.", path ?: "fd");
goto error;
}
r = journal_file_open(fd, path, O_RDONLY, 0, 0, 0, NULL, j->mmap, NULL, &f);
if (r < 0) {
log_debug_errno(r, "Failed to open journal file %s: %m", path ?: "from fd");
goto error;
}
/* journal_file_dump(f); */
/* journal_file_open() generates an replacement fname if necessary, so we can use f->path. */
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). The caller or we will do that ourselves. */
(void) journal_file_close(f);
goto error;
}
TAKE_FD(our_fd); /* 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);
return 0;
error:
(void) journal_put_error(j, r, path); /* path==NULL is OK. */
return r;
}
static int add_file_by_name(
sd_journal *j,
const char *prefix,
const char *filename) {
_cleanup_free_ char *path = NULL;
assert(j);
assert(prefix);
assert(filename);
if (j->no_new_files)
return 0;
if (!file_type_wanted(j->flags, filename))
return 0;
path = path_join(prefix, filename);
if (!path)
return -ENOMEM;
return add_any_file(j, -1, path);
}
static int remove_file_by_name(
sd_journal *j,
const char *prefix,
const char *filename) {
_cleanup_free_ char *path = NULL;
JournalFile *f;
assert(j);
assert(prefix);
assert(filename);
path = path_join(prefix, filename);
if (!path)
return -ENOMEM;
f = ordered_hashmap_get(j->files, path);
if (!f)
return 0;
remove_file_real(j, f);
return 1;
}
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;
const char *e;
int r;
/* Returns true if the specified directory name matches the local machine ID */
r = sd_id128_get_machine(&machine);
if (r < 0)
return r;
e = strchr(fn, '.');
if (e) {
const char *k;
/* Looks like it has a namespace suffix. Verify that. */
if (!log_namespace_name_valid(e + 1))
return false;
k = strndupa_safe(fn, e - fn);
r = sd_id128_from_string(k, &id);
} else
r = sd_id128_from_string(fn, &id);
if (r < 0)
return r;
return sd_id128_equal(id, machine);
}
static int dirname_has_namespace(const char *fn, const char *namespace) {
const char *e;
/* Returns true if the specified directory name matches the specified namespace */
e = strchr(fn, '.');
if (e) {
const char *k;
if (!namespace)
return false;
if (!streq(e + 1, namespace))
return false;
k = strndupa_safe(fn, e - fn);
return id128_is_valid(k);
}
if (namespace)
return false;
return id128_is_valid(fn);
}
static bool dirent_is_journal_file(const struct dirent *de) {
assert(de);
/* Returns true if the specified directory entry looks like a journal file we might be interested in */
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_journal_subdir(const struct dirent *de) {
const char *e, *n;
assert(de);
/* returns true if the specified directory entry looks like a directory that might contain journal
* files we might be interested in, i.e. is either a 128bit ID or a 128bit ID suffixed by a
* namespace. */
if (!IN_SET(de->d_type, DT_DIR, DT_LNK, DT_UNKNOWN))
return false;
e = strchr(de->d_name, '.');
if (!e)
return id128_is_valid(de->d_name); /* No namespace */
n = strndupa_safe(de->d_name, e - de->d_name);
if (!id128_is_valid(n))
return false;
return log_namespace_name_valid(e + 1);
}
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) {
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_journal_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 */
path = path_join(prefix, dirname);
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 (dirname &&
(!(FLAGS_SET(j->flags, SD_JOURNAL_ALL_NAMESPACES) ||
dirname_has_namespace(dirname, j->namespace) > 0 ||
(FLAGS_SET(j->flags, SD_JOURNAL_INCLUDE_DEFAULT_NAMESPACE) && dirname_has_namespace(dirname, NULL) > 0))))
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 = new(Directory, 1);
if (!m) {
r = -ENOMEM;
goto fail;
}
*m = (Directory) {
.is_root = false,
.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 {
_cleanup_close_ int dfd = -EBADF;
/* 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 = take_fdopendir(&dfd);
if (!d) {
r = -errno;
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)
(void) 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";
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) {
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) {
_cleanup_free_ char *dir = NULL;
int r;
r = path_extract_directory(f->path, &dir);
if (r < 0)
return r;
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, const char *namespace) {
_cleanup_(sd_journal_closep) sd_journal *j = NULL;
j = new(sd_journal, 1);
if (!j)
return NULL;
*j = (sd_journal) {
.original_pid = getpid_cached(),
.toplevel_fd = -EBADF,
.inotify_fd = -EBADF,
.flags = flags,
.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;
}
if (namespace) {
j->namespace = strdup(namespace);
if (!j->namespace)
return NULL;
}
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 | \
SD_JOURNAL_ALL_NAMESPACES | \
SD_JOURNAL_INCLUDE_DEFAULT_NAMESPACE)
_public_ int sd_journal_open_namespace(sd_journal **ret, const char *namespace, 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, namespace);
if (!j)
return -ENOMEM;
r = add_search_paths(j);
if (r < 0)
return r;
*ret = TAKE_PTR(j);
return 0;
}
_public_ int sd_journal_open(sd_journal **ret, int flags) {
return sd_journal_open_namespace(ret, NULL, flags);
}
#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 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(hostname_is_valid(machine, 0), -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, NULL);
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, NULL);
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;
int r;
assert_return(ret, -EINVAL);
assert_return(flags == 0, -EINVAL);
j = journal_new(flags, NULL, 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, 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) {
JournalFile *f;
_cleanup_(sd_journal_closep) sd_journal *j = NULL;
int r;
assert_return(ret, -EINVAL);
assert_return(n_fds > 0, -EBADF);
assert_return(flags == 0, -EINVAL);
j = journal_new(flags, NULL, NULL);
if (!j)
return -ENOMEM;
for (unsigned 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)
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) {
mmap_cache_stats_log_debug(j->mmap);
mmap_cache_unref(j->mmap);
}
hashmap_free_free(j->errors);
free(j->path);
free(j->prefix);
free(j->namespace);
free(j->unique_field);
free(j->fields_buffer);
free(j);
}
_public_ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
JournalFile *f;
Object *o;
int r;
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;
uint64_t t = le64toh(o->entry.realtime);
if (!VALID_REALTIME(t))
return -EBADMSG;
if (ret)
*ret = t;
return 0;
}
_public_ int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *ret, sd_id128_t *ret_boot_id) {
JournalFile *f;
Object *o;
int r;
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 {
sd_id128_t id;
r = sd_id128_get_boot(&id);
if (r < 0)
return r;
if (!sd_id128_equal(id, o->entry.boot_id))
return -ESTALE;
}
uint64_t t = le64toh(o->entry.monotonic);
if (!VALID_MONOTONIC(t))
return -EBADMSG;
if (ret)
*ret = t;
return 0;
}
static bool field_is_valid(const char *field) {
assert(field);
if (isempty(field))
return false;
if (startswith(field, "__"))
return false;
for (const char *p = field; *p; p++) {
if (*p == '_')
continue;
if (*p >= 'A' && *p <= 'Z')
continue;
if (ascii_isdigit(*p))
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;
size_t field_length;
Object *o;
int r;
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);
uint64_t n = journal_file_entry_n_items(f, o);
for (uint64_t i = 0; i < n; i++) {
uint64_t p;
void *d;
size_t l;
p = journal_file_entry_item_object_offset(f, o, i);
r = journal_file_data_payload(f, NULL, p, field, field_length, j->data_threshold, &d, &l);
if (r == 0)
goto next;
if (IN_SET(r, -EADDRNOTAVAIL, -EBADMSG)) {
log_debug_errno(r, "Entry item %"PRIu64" data object is bad, skipping over it: %m", i);
goto next;
}
if (r < 0)
return r;
*data = d;
*size = l;
return 0;
next:
/* journal_file_data_payload() may clear or overwrite cached object. */
r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
if (r < 0)
return r;
}
return -ENOENT;
}
_public_ int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) {
JournalFile *f;
Object *o;
int r;
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;
for (uint64_t n = journal_file_entry_n_items(f, o); j->current_field < n; j->current_field++) {
uint64_t p;
void *d;
size_t l;
p = journal_file_entry_item_object_offset(f, o, j->current_field);
r = journal_file_data_payload(f, NULL, p, NULL, 0, j->data_threshold, &d, &l);
if (IN_SET(r, -EADDRNOTAVAIL, -EBADMSG)) {
log_debug_errno(r, "Entry item %"PRIu64" data object is bad, skipping over it: %m", j->current_field);
goto next;
}
if (r < 0)
return r;
assert(r > 0);
*data = d;
*size = l;
j->current_field++;
return 1;
next:
/* journal_file_data_payload() may clear or overwrite cached object. */
r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
if (r < 0)
return r;
}
return 0;
}
_public_ int sd_journal_enumerate_available_data(sd_journal *j, const void **data, size_t *size) {
for (;;) {
int r;
r = sd_journal_enumerate_data(j, data, size);
if (r >= 0)
return r;
if (!JOURNAL_ERRNO_IS_UNAVAILABLE_FIELD(r))
return r;
j->current_field++; /* Try with the next field */
}
}
_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_MAX;
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;
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) {
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) {
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, const 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))
(void) 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;
ssize_t l;
l = read(j->inotify_fd, &buffer, sizeof(buffer));
if (l < 0) {
if (ERRNO_IS_TRANSIENT(errno))
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) {
JournalFile *f;
/* This is the first invocation, hence create the inotify watch */
r = sd_journal_get_fd(j);
if (r < 0)
return r;
/* Server might have done some vacuuming while we weren't watching. Get rid of the deleted
* files now so they don't stay around indefinitely. */
ORDERED_HASHMAP_FOREACH(f, j->files) {
r = journal_file_fstat(f);
if (r == -EIDRM)
remove_file_real(j, f);
else if (r < 0)
log_debug_errno(r, "Failed to fstat() journal file '%s', ignoring: %m", f->path);
}
/* 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_MAX) {
t = usec_sub_unsigned(t, now(CLOCK_MONOTONIC));
if (timeout_usec == UINT64_MAX || 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) {
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) {
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 *ret_from,
uint64_t *ret_to) {
uint64_t from = UINT64_MAX, to = UINT64_MAX;
bool found = false;
JournalFile *f;
int r;
assert_return(j, -EINVAL);
assert_return(!journal_pid_changed(j), -ECHILD);
assert_return(ret_from != ret_to, -EINVAL);
ORDERED_HASHMAP_FOREACH(f, j->files) {
usec_t ff, tt;
r = journal_file_get_cutoff_monotonic_usec(f, boot_id, &ff, &tt);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
if (r == 0)
continue;
if (found) {
from = MIN(ff, from);
to = MAX(tt, to);
} else {
from = ff;
to = tt;
found = true;
}
}
if (ret_from)
*ret_from = from;
if (ret_to)
*ret_to = to;
return found;
}
void journal_print_header(sd_journal *j) {
JournalFile *f;
bool newline = false;
assert(j);
ORDERED_HASHMAP_FOREACH(f, j->files) {
if (newline)
putchar('\n');
else
newline = true;
journal_file_print_header(f);
}
}
_public_ int sd_journal_get_usage(sd_journal *j, uint64_t *ret) {
JournalFile *f;
uint64_t sum = 0;
assert_return(j, -EINVAL);
assert_return(!journal_pid_changed(j), -ECHILD);
assert_return(ret, -EINVAL);
ORDERED_HASHMAP_FOREACH(f, j->files) {
struct stat st;
uint64_t b;
if (fstat(f->fd, &st) < 0)
return -errno;
b = (uint64_t) st.st_blocks;
if (b > UINT64_MAX / 512)
return -EOVERFLOW;
b *= 512;
if (sum > UINT64_MAX - b)
return -EOVERFLOW;
sum += b;
}
*ret = sum;
return 0;
}
_public_ int sd_journal_query_unique(sd_journal *j, const char *field) {
int r;
assert_return(j, -EINVAL);
assert_return(!journal_pid_changed(j), -ECHILD);
assert_return(!isempty(field), -EINVAL);
assert_return(field_is_valid(field), -EINVAL);
r = free_and_strdup(&j->unique_field, field);
if (r < 0)
return r;
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 **ret_data,
size_t *ret_size) {
size_t k;
assert_return(j, -EINVAL);
assert_return(!journal_pid_changed(j), -ECHILD);
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;
Object *o;
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 = journal_file_data_payload(j->unique_file, o, j->unique_offset, NULL, 0,
j->data_threshold, &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) != 0 || ((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) {
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;
/* We can reuse the hash from our current file only on old-style journal files
* without keyed hashes. On new-style files we have to calculate the hash anew, to
* take the per-file hash seed into consideration. */
if (!JOURNAL_HEADER_KEYED_HASH(j->unique_file->header) && !JOURNAL_HEADER_KEYED_HASH(of->header))
r = journal_file_find_data_object_with_hash(of, odata, ol, le64toh(o->data.hash), NULL, NULL);
else
r = journal_file_find_data_object(of, odata, ol, NULL, NULL);
if (r < 0)
return r;
if (r > 0) {
found = true;
break;
}
}
if (found)
continue;
*ret_data = odata;
*ret_size = ol;
return 1;
}
}
_public_ int sd_journal_enumerate_available_unique(sd_journal *j, const void **data, size_t *size) {
for (;;) {
int r;
r = sd_journal_enumerate_unique(j, data, size);
if (r >= 0)
return r;
if (!JOURNAL_ERRNO_IS_UNAVAILABLE_FIELD(r))
return r;
/* Try with the next field. sd_journal_enumerate_unique() modifies state, so on the next try
* we will access the next field. */
}
}
_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;
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) {
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;
if (!JOURNAL_HEADER_KEYED_HASH(f->header) && !JOURNAL_HEADER_KEYED_HASH(of->header))
r = journal_file_find_field_object_with_hash(of, o->field.payload, sz,
le64toh(o->field.hash), NULL, NULL);
else
r = journal_file_find_field_object(of, o->field.payload, sz, 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 (j->data_threshold > 0 && sz > j->data_threshold)
sz = j->data_threshold;
if (!GREEDY_REALLOC(j->fields_buffer, 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 = ASSERT_PTR(userdata);
const void *data;
size_t size, d;
int r;
assert(field);
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;
}