sd-journal.c revision d5c4ed623b3b83b8caaf6b26f5b4c8006ff372ac
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering/***
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering This file is part of systemd.
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering Copyright 2011 Lennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering systemd is free software; you can redistribute it and/or modify it
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering under the terms of the GNU Lesser General Public License as published by
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering the Free Software Foundation; either version 2.1 of the License, or
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering (at your option) any later version.
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering systemd is distributed in the hope that it will be useful, but
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering WITHOUT ANY WARRANTY; without even the implied warranty of
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering Lesser General Public License for more details.
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering You should have received a copy of the GNU Lesser General Public License
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering along with systemd; If not, see <http://www.gnu.org/licenses/>.
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering***/
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering#include <errno.h>
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering#include <fcntl.h>
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include <stddef.h>
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering#include <unistd.h>
b5efdb8af40ea759a1ea584c1bc44ecc81dd00ceLennart Poettering#include <sys/inotify.h>
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering#include <sys/poll.h>
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include "sd-journal.h"
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include "journal-def.h"
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering#include "journal-file.h"
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering#include "hashmap.h"
4afd3348c7506dd1d36305b7bcb9feb8952b9d6bLennart Poettering#include "list.h"
7fd1b19bc9e9f5574f2877936b8ac267c7706947Harald Hoyer#include "path-util.h"
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering#include "lookup3.h"
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering#include "compress.h"
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering#include "journal-internal.h"
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering#define JOURNAL_FILES_MAX 1024
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poetteringstatic void detach_location(sd_journal *j) {
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering Iterator i;
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering JournalFile *f;
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering assert(j);
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering j->current_file = NULL;
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering j->current_field = 0;
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering HASHMAP_FOREACH(f, j->files, i)
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering f->current_offset = 0;
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering}
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poetteringstatic void reset_location(sd_journal *j) {
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering assert(j);
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering detach_location(j);
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering zero(j->current_location);
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer}
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyerstatic void init_location(Location *l, LocationType type, JournalFile *f, Object *o) {
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer assert(l);
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer assert(type == LOCATION_DISCRETE || type == LOCATION_SEEK);
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer assert(f);
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer assert(o->object.type == OBJECT_ENTRY);
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering l->type = type;
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer l->seqnum = le64toh(o->entry.seqnum);
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer l->seqnum_id = f->header->seqnum_id;
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer l->realtime = le64toh(o->entry.realtime);
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer l->monotonic = le64toh(o->entry.monotonic);
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering l->boot_id = o->entry.boot_id;
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering l->xor_hash = le64toh(o->entry.xor_hash);
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer l->seqnum_set = l->realtime_set = l->monotonic_set = l->xor_hash_set = true;
cd34b3c6670df8a3fd49179131fe762b2dd86b01Harald Hoyer}
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poettering
cbdca8525b4f36297cb9e5cb090a9648763ed1bfLennart Poetteringstatic void set_location(sd_journal *j, LocationType type, JournalFile *f, Object *o, uint64_t offset) {
assert(j);
assert(type == LOCATION_DISCRETE || type == LOCATION_SEEK);
assert(f);
assert(o);
init_location(&j->current_location, type, f, o);
j->current_file = f;
j->current_field = 0;
f->current_offset = offset;
}
static int match_is_valid(const void *data, size_t size) {
const char *b, *p;
assert(data);
if (size < 2)
return false;
if (startswith(data, "__"))
return false;
b = data;
for (p = b; p < b + size; p++) {
if (*p == '=')
return p > b;
if (*p == '_')
continue;
if (*p >= 'A' && *p <= 'Z')
continue;
if (*p >= '0' && *p <= '9')
continue;
return false;
}
return false;
}
static bool same_field(const void *_a, size_t s, const void *_b, size_t t) {
const uint8_t *a = _a, *b = _b;
size_t j;
for (j = 0; j < s && j < t; j++) {
if (a[j] != b[j])
return false;
if (a[j] == '=')
return true;
}
return true;
}
static Match *match_new(Match *p, MatchType t) {
Match *m;
m = new0(Match, 1);
if (!m)
return NULL;
m->type = t;
if (p) {
m->parent = p;
LIST_PREPEND(Match, matches, p->matches, m);
}
return m;
}
static void match_free(Match *m) {
assert(m);
while (m->matches)
match_free(m->matches);
if (m->parent)
LIST_REMOVE(Match, matches, m->parent->matches, m);
free(m->data);
free(m);
}
static void match_free_if_empty(Match *m) {
assert(m);
if (m->matches)
return;
match_free(m);
}
_public_ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
Match *l2, *l3, *add_here = NULL, *m;
le64_t le_hash;
if (!j)
return -EINVAL;
if (!data)
return -EINVAL;
if (size == 0)
size = strlen(data);
if (!match_is_valid(data, size))
return -EINVAL;
/* level 0: OR term
* level 1: AND terms
* level 2: OR terms
* level 3: concrete matches */
if (!j->level0) {
j->level0 = match_new(NULL, MATCH_OR_TERM);
if (!j->level0)
return -ENOMEM;
}
if (!j->level1) {
j->level1 = match_new(j->level0, MATCH_AND_TERM);
if (!j->level1)
return -ENOMEM;
}
assert(j->level0->type == MATCH_OR_TERM);
assert(j->level1->type == MATCH_AND_TERM);
le_hash = htole64(hash64(data, size));
LIST_FOREACH(matches, l2, j->level1->matches) {
assert(l2->type == MATCH_OR_TERM);
LIST_FOREACH(matches, l3, l2->matches) {
assert(l3->type == MATCH_DISCRETE);
/* Exactly the same match already? Then ignore
* this addition */
if (l3->le_hash == le_hash &&
l3->size == size &&
memcmp(l3->data, data, size) == 0)
return 0;
/* Same field? Then let's add this to this OR term */
if (same_field(data, size, l3->data, l3->size)) {
add_here = l2;
break;
}
}
if (add_here)
break;
}
if (!add_here) {
add_here = match_new(j->level1, MATCH_OR_TERM);
if (!add_here)
goto fail;
}
m = match_new(add_here, MATCH_DISCRETE);
if (!m)
goto fail;
m->le_hash = le_hash;
m->size = size;
m->data = memdup(data, size);
if (!m->data)
goto fail;
detach_location(j);
return 0;
fail:
if (add_here)
match_free_if_empty(add_here);
if (j->level1)
match_free_if_empty(j->level1);
if (j->level0)
match_free_if_empty(j->level0);
return -ENOMEM;
}
_public_ int sd_journal_add_disjunction(sd_journal *j) {
Match *m;
assert(j);
if (!j->level0)
return 0;
if (!j->level1)
return 0;
if (!j->level1->matches)
return 0;
m = match_new(j->level0, MATCH_AND_TERM);
if (!m)
return -ENOMEM;
j->level1 = m;
return 0;
}
static char *match_make_string(Match *m) {
char *p, *r;
Match *i;
bool enclose = false;
if (!m)
return strdup("");
if (m->type == MATCH_DISCRETE)
return strndup(m->data, m->size);
p = NULL;
LIST_FOREACH(matches, i, m->matches) {
char *t, *k;
t = match_make_string(i);
if (!t) {
free(p);
return NULL;
}
if (p) {
k = strjoin(p, m->type == MATCH_OR_TERM ? " OR " : " AND ", t, NULL);
free(p);
free(t);
if (!k)
return NULL;
p = k;
enclose = true;
} else {
free(p);
p = t;
}
}
if (enclose) {
r = strjoin("(", p, ")", NULL);
free(p);
return r;
}
return p;
}
char *journal_make_match_string(sd_journal *j) {
assert(j);
return match_make_string(j->level0);
}
_public_ void sd_journal_flush_matches(sd_journal *j) {
if (!j)
return;
if (j->level0)
match_free(j->level0);
j->level0 = j->level1 = NULL;
detach_location(j);
}
static int compare_entry_order(JournalFile *af, Object *_ao,
JournalFile *bf, uint64_t bp) {
uint64_t a, b;
Object *ao, *bo;
int r;
assert(af);
assert(bf);
assert(_ao);
/* The mmap cache might invalidate the object from the first
* file if we look at the one from the second file. Hence
* temporarily copy the header of the first one, and look at
* that only. */
ao = alloca(offsetof(EntryObject, items));
memcpy(ao, _ao, offsetof(EntryObject, items));
r = journal_file_move_to_object(bf, OBJECT_ENTRY, bp, &bo);
if (r < 0)
return strcmp(af->path, bf->path);
/* We operate on two different files here, hence we can access
* two objects at the same time, which we normally can't.
*
* If contents and timestamps match, these entries are
* identical, even if the seqnum does not match */
if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id) &&
ao->entry.monotonic == bo->entry.monotonic &&
ao->entry.realtime == bo->entry.realtime &&
ao->entry.xor_hash == bo->entry.xor_hash)
return 0;
if (sd_id128_equal(af->header->seqnum_id, bf->header->seqnum_id)) {
/* If this is from the same seqnum source, compare
* seqnums */
a = le64toh(ao->entry.seqnum);
b = le64toh(bo->entry.seqnum);
if (a < b)
return -1;
if (a > b)
return 1;
/* Wow! This is weird, different data but the same
* seqnums? Something is borked, but let's make the
* best of it and compare by time. */
}
if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id)) {
/* If the boot id matches compare monotonic time */
a = le64toh(ao->entry.monotonic);
b = le64toh(bo->entry.monotonic);
if (a < b)
return -1;
if (a > b)
return 1;
}
/* Otherwise compare UTC time */
a = le64toh(ao->entry.realtime);
b = le64toh(bo->entry.realtime);
if (a < b)
return -1;
if (a > b)
return 1;
/* Finally, compare by contents */
a = le64toh(ao->entry.xor_hash);
b = le64toh(bo->entry.xor_hash);
if (a < b)
return -1;
if (a > b)
return 1;
return 0;
}
static int compare_with_location(JournalFile *af, Object *ao, Location *l) {
uint64_t a;
assert(af);
assert(ao);
assert(l);
assert(l->type == LOCATION_DISCRETE || l->type == LOCATION_SEEK);
if (l->monotonic_set &&
sd_id128_equal(ao->entry.boot_id, l->boot_id) &&
l->realtime_set &&
le64toh(ao->entry.realtime) == l->realtime &&
l->xor_hash_set &&
le64toh(ao->entry.xor_hash) == l->xor_hash)
return 0;
if (l->seqnum_set &&
sd_id128_equal(af->header->seqnum_id, l->seqnum_id)) {
a = le64toh(ao->entry.seqnum);
if (a < l->seqnum)
return -1;
if (a > l->seqnum)
return 1;
}
if (l->monotonic_set &&
sd_id128_equal(ao->entry.boot_id, l->boot_id)) {
a = le64toh(ao->entry.monotonic);
if (a < l->monotonic)
return -1;
if (a > l->monotonic)
return 1;
}
if (l->realtime_set) {
a = le64toh(ao->entry.realtime);
if (a < l->realtime)
return -1;
if (a > l->realtime)
return 1;
}
if (l->xor_hash_set) {
a = le64toh(ao->entry.xor_hash);
if (a < l->xor_hash)
return -1;
if (a > l->xor_hash)
return 1;
}
return 0;
}
static int next_for_match(
sd_journal *j,
Match *m,
JournalFile *f,
uint64_t after_offset,
direction_t direction,
Object **ret,
uint64_t *offset) {
int r;
uint64_t np = 0;
Object *n;
assert(j);
assert(m);
assert(f);
if (m->type == MATCH_DISCRETE) {
uint64_t dp;
r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), NULL, &dp);
if (r <= 0)
return r;
return journal_file_move_to_entry_by_offset_for_data(f, dp, after_offset, direction, ret, offset);
} else if (m->type == MATCH_OR_TERM) {
Match *i;
/* Find the earliest match beyond after_offset */
LIST_FOREACH(matches, i, m->matches) {
uint64_t cp;
r = next_for_match(j, i, f, after_offset, direction, NULL, &cp);
if (r < 0)
return r;
else if (r > 0) {
if (np == 0 || (direction == DIRECTION_DOWN ? np > cp : np < cp))
np = cp;
}
}
} else if (m->type == MATCH_AND_TERM) {
Match *i;
bool continue_looking;
/* Always jump to the next matching entry and repeat
* this until we fine and offset that matches for all
* matches. */
if (!m->matches)
return 0;
np = 0;
do {
continue_looking = false;
LIST_FOREACH(matches, i, m->matches) {
uint64_t cp, limit;
if (np == 0)
limit = after_offset;
else if (direction == DIRECTION_DOWN)
limit = MAX(np, after_offset);
else
limit = MIN(np, after_offset);
r = next_for_match(j, i, f, limit, direction, NULL, &cp);
if (r <= 0)
return r;
if ((direction == DIRECTION_DOWN ? cp >= after_offset : cp <= after_offset) &&
(np == 0 || (direction == DIRECTION_DOWN ? cp > np : np < cp))) {
np = cp;
continue_looking = true;
}
}
} while (continue_looking);
}
if (np == 0)
return 0;
r = journal_file_move_to_object(f, OBJECT_ENTRY, np, &n);
if (r < 0)
return r;
if (ret)
*ret = n;
if (offset)
*offset = np;
return 1;
}
static int find_location_for_match(
sd_journal *j,
Match *m,
JournalFile *f,
direction_t direction,
Object **ret,
uint64_t *offset) {
int r;
assert(j);
assert(m);
assert(f);
if (m->type == MATCH_DISCRETE) {
uint64_t dp;
r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), NULL, &dp);
if (r <= 0)
return r;
/* FIXME: missing: find by monotonic */
if (j->current_location.type == LOCATION_HEAD)
return journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_DOWN, ret, offset);
if (j->current_location.type == LOCATION_TAIL)
return journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_UP, ret, offset);
if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
return journal_file_move_to_entry_by_seqnum_for_data(f, dp, j->current_location.seqnum, direction, ret, offset);
if (j->current_location.monotonic_set) {
r = journal_file_move_to_entry_by_monotonic_for_data(f, dp, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
if (r != -ENOENT)
return r;
}
if (j->current_location.realtime_set)
return journal_file_move_to_entry_by_realtime_for_data(f, dp, j->current_location.realtime, direction, ret, offset);
return journal_file_next_entry_for_data(f, NULL, 0, dp, direction, ret, offset);
} else if (m->type == MATCH_OR_TERM) {
uint64_t np = 0;
Object *n;
Match *i;
/* Find the earliest match */
LIST_FOREACH(matches, i, m->matches) {
uint64_t cp;
r = find_location_for_match(j, i, f, direction, NULL, &cp);
if (r < 0)
return r;
else if (r > 0) {
if (np == 0 || (direction == DIRECTION_DOWN ? np > cp : np < cp))
np = cp;
}
}
if (np == 0)
return 0;
r = journal_file_move_to_object(f, OBJECT_ENTRY, np, &n);
if (r < 0)
return r;
if (ret)
*ret = n;
if (offset)
*offset = np;
return 1;
} else {
Match *i;
uint64_t np = 0;
assert(m->type == MATCH_AND_TERM);
/* First jump to the last match, and then find the
* next one where all matches match */
if (!m->matches)
return 0;
LIST_FOREACH(matches, i, m->matches) {
uint64_t cp;
r = find_location_for_match(j, i, f, direction, NULL, &cp);
if (r <= 0)
return r;
if (np == 0 || (direction == DIRECTION_DOWN ? np < cp : np > cp))
np = cp;
}
return next_for_match(j, m, f, np, direction, ret, offset);
}
}
static int find_location_with_matches(
sd_journal *j,
JournalFile *f,
direction_t direction,
Object **ret,
uint64_t *offset) {
int r;
assert(j);
assert(f);
assert(ret);
assert(offset);
if (!j->level0) {
/* No matches is simple */
if (j->current_location.type == LOCATION_HEAD)
return journal_file_next_entry(f, NULL, 0, DIRECTION_DOWN, ret, offset);
if (j->current_location.type == LOCATION_TAIL)
return journal_file_next_entry(f, NULL, 0, DIRECTION_UP, ret, offset);
if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
return journal_file_move_to_entry_by_seqnum(f, j->current_location.seqnum, direction, ret, offset);
if (j->current_location.monotonic_set) {
r = journal_file_move_to_entry_by_monotonic(f, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
if (r != -ENOENT)
return r;
}
if (j->current_location.realtime_set)
return journal_file_move_to_entry_by_realtime(f, j->current_location.realtime, direction, ret, offset);
return journal_file_next_entry(f, NULL, 0, direction, ret, offset);
} else
return find_location_for_match(j, j->level0, f, direction, ret, offset);
}
static int next_with_matches(
sd_journal *j,
JournalFile *f,
direction_t direction,
Object **ret,
uint64_t *offset) {
Object *c;
uint64_t cp;
assert(j);
assert(f);
assert(ret);
assert(offset);
c = *ret;
cp = *offset;
/* No matches is easy. We simple advance the file
* pointer by one. */
if (!j->level0)
return journal_file_next_entry(f, c, cp, direction, ret, offset);
/* If we have a match then we look for the next matching entry
* with an offset at least one step larger */
return next_for_match(j, j->level0, f, direction == DIRECTION_DOWN ? cp+1 : cp-1, direction, ret, offset);
}
static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) {
Object *c;
uint64_t cp;
int r;
assert(j);
assert(f);
if (f->current_offset > 0) {
cp = f->current_offset;
r = journal_file_move_to_object(f, OBJECT_ENTRY, cp, &c);
if (r < 0)
return r;
r = next_with_matches(j, f, direction, &c, &cp);
if (r <= 0)
return r;
} else {
r = find_location_with_matches(j, f, direction, &c, &cp);
if (r <= 0)
return r;
}
/* OK, we found the spot, now let's advance until to an entry
* that is actually different from what we were previously
* looking at. This is necessary to handle entries which exist
* in two (or more) journal files, and which shall all be
* suppressed but one. */
for (;;) {
bool found;
if (j->current_location.type == LOCATION_DISCRETE) {
int k;
k = compare_with_location(f, c, &j->current_location);
if (direction == DIRECTION_DOWN)
found = k > 0;
else
found = k < 0;
} else
found = true;
if (found) {
if (ret)
*ret = c;
if (offset)
*offset = cp;
return 1;
}
r = next_with_matches(j, f, direction, &c, &cp);
if (r <= 0)
return r;
}
}
static int real_journal_next(sd_journal *j, direction_t direction) {
JournalFile *f, *new_file = NULL;
uint64_t new_offset = 0;
Object *o;
uint64_t p;
Iterator i;
int r;
if (!j)
return -EINVAL;
HASHMAP_FOREACH(f, j->files, i) {
bool found;
r = next_beyond_location(j, f, direction, &o, &p);
if (r < 0) {
log_debug("Can't iterate through %s, ignoring: %s", f->path, strerror(-r));
continue;
} else if (r == 0)
continue;
if (!new_file)
found = true;
else {
int k;
k = compare_entry_order(f, o, new_file, new_offset);
if (direction == DIRECTION_DOWN)
found = k < 0;
else
found = k > 0;
}
if (found) {
new_file = f;
new_offset = p;
}
}
if (!new_file)
return 0;
r = journal_file_move_to_object(new_file, OBJECT_ENTRY, new_offset, &o);
if (r < 0)
return r;
set_location(j, LOCATION_DISCRETE, new_file, o, new_offset);
return 1;
}
_public_ int sd_journal_next(sd_journal *j) {
return real_journal_next(j, DIRECTION_DOWN);
}
_public_ int sd_journal_previous(sd_journal *j) {
return real_journal_next(j, DIRECTION_UP);
}
static int real_journal_next_skip(sd_journal *j, direction_t direction, uint64_t skip) {
int c = 0, r;
if (!j)
return -EINVAL;
if (skip == 0) {
/* If this is not a discrete skip, then at least
* resolve the current location */
if (j->current_location.type != LOCATION_DISCRETE)
return real_journal_next(j, direction);
return 0;
}
do {
r = real_journal_next(j, direction);
if (r < 0)
return r;
if (r == 0)
return c;
skip--;
c++;
} while (skip > 0);
return c;
}
_public_ int sd_journal_next_skip(sd_journal *j, uint64_t skip) {
return real_journal_next_skip(j, DIRECTION_DOWN, skip);
}
_public_ int sd_journal_previous_skip(sd_journal *j, uint64_t skip) {
return real_journal_next_skip(j, DIRECTION_UP, skip);
}
_public_ int sd_journal_get_cursor(sd_journal *j, char **cursor) {
Object *o;
int r;
char bid[33], sid[33];
if (!j)
return -EINVAL;
if (!cursor)
return -EINVAL;
if (!j->current_file || j->current_file->current_offset <= 0)
return -EADDRNOTAVAIL;
r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
if (r < 0)
return r;
sd_id128_to_string(j->current_file->header->seqnum_id, sid);
sd_id128_to_string(o->entry.boot_id, bid);
if (asprintf(cursor,
"s=%s;i=%llx;b=%s;m=%llx;t=%llx;x=%llx",
sid, (unsigned long long) le64toh(o->entry.seqnum),
bid, (unsigned long long) le64toh(o->entry.monotonic),
(unsigned long long) le64toh(o->entry.realtime),
(unsigned long long) le64toh(o->entry.xor_hash)) < 0)
return -ENOMEM;
return 1;
}
_public_ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
char *w, *state;
size_t l;
unsigned long long seqnum, monotonic, realtime, xor_hash;
bool
seqnum_id_set = false,
seqnum_set = false,
boot_id_set = false,
monotonic_set = false,
realtime_set = false,
xor_hash_set = false;
sd_id128_t seqnum_id, boot_id;
if (!j)
return -EINVAL;
if (isempty(cursor))
return -EINVAL;
FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
char *item;
int k = 0;
if (l < 2 || w[1] != '=')
return -EINVAL;
item = strndup(w, l);
if (!item)
return -ENOMEM;
switch (w[0]) {
case 's':
seqnum_id_set = true;
k = sd_id128_from_string(item+2, &seqnum_id);
break;
case 'i':
seqnum_set = true;
if (sscanf(item+2, "%llx", &seqnum) != 1)
k = -EINVAL;
break;
case 'b':
boot_id_set = true;
k = sd_id128_from_string(item+2, &boot_id);
break;
case 'm':
monotonic_set = true;
if (sscanf(item+2, "%llx", &monotonic) != 1)
k = -EINVAL;
break;
case 't':
realtime_set = true;
if (sscanf(item+2, "%llx", &realtime) != 1)
k = -EINVAL;
break;
case 'x':
xor_hash_set = true;
if (sscanf(item+2, "%llx", &xor_hash) != 1)
k = -EINVAL;
break;
}
free(item);
if (k < 0)
return k;
}
if ((!seqnum_set || !seqnum_id_set) &&
(!monotonic_set || !boot_id_set) &&
!realtime_set)
return -EINVAL;
reset_location(j);
j->current_location.type = LOCATION_SEEK;
if (realtime_set) {
j->current_location.realtime = (uint64_t) realtime;
j->current_location.realtime_set = true;
}
if (seqnum_set && seqnum_id_set) {
j->current_location.seqnum = (uint64_t) seqnum;
j->current_location.seqnum_id = seqnum_id;
j->current_location.seqnum_set = true;
}
if (monotonic_set && boot_id_set) {
j->current_location.monotonic = (uint64_t) monotonic;
j->current_location.boot_id = boot_id;
j->current_location.monotonic_set = true;
}
if (xor_hash_set) {
j->current_location.xor_hash = (uint64_t) xor_hash;
j->current_location.xor_hash_set = true;
}
return 0;
}
_public_ int sd_journal_test_cursor(sd_journal *j, const char *cursor) {
int r;
char *w, *state;
size_t l;
Object *o;
if (!j)
return -EINVAL;
if (isempty(cursor))
return -EINVAL;
if (!j->current_file || j->current_file->current_offset <= 0)
return -EADDRNOTAVAIL;
r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
if (r < 0)
return r;
FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
_cleanup_free_ char *item = NULL;
sd_id128_t id;
unsigned long long ll;
int k = 0;
if (l < 2 || w[1] != '=')
return -EINVAL;
item = strndup(w, l);
if (!item)
return -ENOMEM;
switch (w[0]) {
case 's':
k = sd_id128_from_string(item+2, &id);
if (k < 0)
return k;
if (!sd_id128_equal(id, j->current_file->header->seqnum_id))
return 0;
break;
case 'i':
if (sscanf(item+2, "%llx", &ll) != 1)
return -EINVAL;
if (ll != le64toh(o->entry.seqnum))
return 0;
break;
case 'b':
k = sd_id128_from_string(item+2, &id);
if (k < 0)
return k;
if (!sd_id128_equal(id, o->entry.boot_id))
return 0;
break;
case 'm':
if (sscanf(item+2, "%llx", &ll) != 1)
return -EINVAL;
if (ll != le64toh(o->entry.monotonic))
return 0;
break;
case 't':
if (sscanf(item+2, "%llx", &ll) != 1)
return -EINVAL;
if (ll != le64toh(o->entry.realtime))
return 0;
break;
case 'x':
if (sscanf(item+2, "%llx", &ll) != 1)
return -EINVAL;
if (ll != le64toh(o->entry.xor_hash))
return 0;
break;
}
}
return 1;
}
_public_ int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t usec) {
if (!j)
return -EINVAL;
reset_location(j);
j->current_location.type = LOCATION_SEEK;
j->current_location.boot_id = boot_id;
j->current_location.monotonic = usec;
j->current_location.monotonic_set = true;
return 0;
}
_public_ int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec) {
if (!j)
return -EINVAL;
reset_location(j);
j->current_location.type = LOCATION_SEEK;
j->current_location.realtime = usec;
j->current_location.realtime_set = true;
return 0;
}
_public_ int sd_journal_seek_head(sd_journal *j) {
if (!j)
return -EINVAL;
reset_location(j);
j->current_location.type = LOCATION_HEAD;
return 0;
}
_public_ int sd_journal_seek_tail(sd_journal *j) {
if (!j)
return -EINVAL;
reset_location(j);
j->current_location.type = LOCATION_TAIL;
return 0;
}
static int add_file(sd_journal *j, const char *prefix, const char *filename) {
char *path;
int r;
JournalFile *f;
assert(j);
assert(prefix);
assert(filename);
if ((j->flags & SD_JOURNAL_SYSTEM_ONLY) &&
!(streq(filename, "system.journal") ||
streq(filename, "system.journal~") ||
(startswith(filename, "system@") &&
(endswith(filename, ".journal") || endswith(filename, ".journal~")))))
return 0;
path = strjoin(prefix, "/", filename, NULL);
if (!path)
return -ENOMEM;
if (hashmap_get(j->files, path)) {
free(path);
return 0;
}
if (hashmap_size(j->files) >= JOURNAL_FILES_MAX) {
log_debug("Too many open journal files, not adding %s, ignoring.", path);
free(path);
return 0;
}
r = journal_file_open(path, O_RDONLY, 0, false, false, NULL, j->mmap, NULL, &f);
free(path);
if (r < 0) {
if (errno == ENOENT)
return 0;
return r;
}
/* journal_file_dump(f); */
r = hashmap_put(j->files, f->path, f);
if (r < 0) {
journal_file_close(f);
return r;
}
j->current_invalidate_counter ++;
log_debug("File %s got added.", f->path);
return 0;
}
static int remove_file(sd_journal *j, const char *prefix, const char *filename) {
char *path;
JournalFile *f;
assert(j);
assert(prefix);
assert(filename);
path = strjoin(prefix, "/", filename, NULL);
if (!path)
return -ENOMEM;
f = hashmap_get(j->files, path);
free(path);
if (!f)
return 0;
hashmap_remove(j->files, f->path);
log_debug("File %s got removed.", f->path);
if (j->current_file == f) {
j->current_file = NULL;
j->current_field = 0;
}
if (j->unique_file == f) {
j->unique_file = NULL;
j->unique_offset = 0;
}
journal_file_close(f);
j->current_invalidate_counter ++;
return 0;
}
static int add_directory(sd_journal *j, const char *prefix, const char *dirname) {
char *path;
int r;
DIR *d;
sd_id128_t id, mid;
Directory *m;
assert(j);
assert(prefix);
assert(dirname);
if ((j->flags & SD_JOURNAL_LOCAL_ONLY) &&
(sd_id128_from_string(dirname, &id) < 0 ||
sd_id128_get_machine(&mid) < 0 ||
!sd_id128_equal(id, mid)))
return 0;
path = strjoin(prefix, "/", dirname, NULL);
if (!path)
return -ENOMEM;
d = opendir(path);
if (!d) {
log_debug("Failed to open %s: %m", path);
free(path);
if (errno == ENOENT)
return 0;
return -errno;
}
m = hashmap_get(j->directories_by_path, path);
if (!m) {
m = new0(Directory, 1);
if (!m) {
closedir(d);
free(path);
return -ENOMEM;
}
m->is_root = false;
m->path = path;
if (hashmap_put(j->directories_by_path, m->path, m) < 0) {
closedir(d);
free(m->path);
free(m);
return -ENOMEM;
}
j->current_invalidate_counter ++;
log_debug("Directory %s got added.", m->path);
} else if (m->is_root) {
free (path);
closedir(d);
return 0;
} else
free(path);
if (m->wd <= 0 && j->inotify_fd >= 0) {
m->wd = inotify_add_watch(j->inotify_fd, m->path,
IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|IN_MOVED_FROM|
IN_ONLYDIR);
if (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0)
inotify_rm_watch(j->inotify_fd, m->wd);
}
for (;;) {
struct dirent *de;
union dirent_storage buf;
r = readdir_r(d, &buf.de, &de);
if (r != 0 || !de)
break;
if (dirent_is_file_with_suffix(de, ".journal") ||
dirent_is_file_with_suffix(de, ".journal~")) {
r = add_file(j, m->path, de->d_name);
if (r < 0)
log_debug("Failed to add file %s/%s: %s", m->path, de->d_name, strerror(-r));
}
}
closedir(d);
return 0;
}
static int add_root_directory(sd_journal *j, const char *p) {
DIR *d;
Directory *m;
int r;
assert(j);
assert(p);
if ((j->flags & SD_JOURNAL_RUNTIME_ONLY) &&
!path_startswith(p, "/run"))
return -EINVAL;
d = opendir(p);
if (!d)
return -errno;
m = hashmap_get(j->directories_by_path, p);
if (!m) {
m = new0(Directory, 1);
if (!m) {
closedir(d);
return -ENOMEM;
}
m->is_root = true;
m->path = strdup(p);
if (!m->path) {
closedir(d);
free(m);
return -ENOMEM;
}
if (hashmap_put(j->directories_by_path, m->path, m) < 0) {
closedir(d);
free(m->path);
free(m);
return -ENOMEM;
}
j->current_invalidate_counter ++;
log_debug("Root directory %s got added.", m->path);
} else if (!m->is_root) {
closedir(d);
return 0;
}
if (m->wd <= 0 && j->inotify_fd >= 0) {
m->wd = inotify_add_watch(j->inotify_fd, m->path,
IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
IN_ONLYDIR);
if (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0)
inotify_rm_watch(j->inotify_fd, m->wd);
}
for (;;) {
struct dirent *de;
union dirent_storage buf;
sd_id128_t id;
r = readdir_r(d, &buf.de, &de);
if (r != 0 || !de)
break;
if (dirent_is_file_with_suffix(de, ".journal") ||
dirent_is_file_with_suffix(de, ".journal~")) {
r = add_file(j, m->path, de->d_name);
if (r < 0)
log_debug("Failed to add file %s/%s: %s", m->path, de->d_name, strerror(-r));
} else if ((de->d_type == DT_DIR || de->d_type == DT_LNK || de->d_type == DT_UNKNOWN) &&
sd_id128_from_string(de->d_name, &id) >= 0) {
r = add_directory(j, m->path, de->d_name);
if (r < 0)
log_debug("Failed to add directory %s/%s: %s", m->path, de->d_name, strerror(-r));
}
}
closedir(d);
return 0;
}
static int remove_directory(sd_journal *j, Directory *d) {
assert(j);
if (d->wd > 0) {
hashmap_remove(j->directories_by_wd, INT_TO_PTR(d->wd));
if (j->inotify_fd >= 0)
inotify_rm_watch(j->inotify_fd, d->wd);
}
hashmap_remove(j->directories_by_path, d->path);
if (d->is_root)
log_debug("Root directory %s got removed.", d->path);
else
log_debug("Directory %s got removed.", d->path);
free(d->path);
free(d);
return 0;
}
static int add_search_paths(sd_journal *j) {
const char search_paths[] =
"/run/log/journal\0"
"/var/log/journal\0";
const char *p;
assert(j);
/* We ignore most errors here, since the idea is to only open
* what's actually accessible, and ignore the rest. */
NULSTR_FOREACH(p, search_paths)
add_root_directory(j, p);
return 0;
}
static int allocate_inotify(sd_journal *j) {
assert(j);
if (j->inotify_fd < 0) {
j->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
if (j->inotify_fd < 0)
return -errno;
}
if (!j->directories_by_wd) {
j->directories_by_wd = hashmap_new(trivial_hash_func, trivial_compare_func);
if (!j->directories_by_wd)
return -ENOMEM;
}
return 0;
}
static sd_journal *journal_new(int flags, const char *path) {
sd_journal *j;
j = new0(sd_journal, 1);
if (!j)
return NULL;
j->inotify_fd = -1;
j->flags = flags;
if (path) {
j->path = strdup(path);
if (!j->path) {
free(j);
return NULL;
}
}
j->files = hashmap_new(string_hash_func, string_compare_func);
if (!j->files) {
free(j->path);
free(j);
return NULL;
}
j->directories_by_path = hashmap_new(string_hash_func, string_compare_func);
if (!j->directories_by_path) {
hashmap_free(j->files);
free(j->path);
free(j);
return NULL;
}
j->mmap = mmap_cache_new();
if (!j->mmap) {
hashmap_free(j->files);
hashmap_free(j->directories_by_path);
free(j->path);
free(j);
return NULL;
}
return j;
}
_public_ int sd_journal_open(sd_journal **ret, int flags) {
sd_journal *j;
int r;
if (!ret)
return -EINVAL;
if (flags & ~(SD_JOURNAL_LOCAL_ONLY|
SD_JOURNAL_RUNTIME_ONLY|
SD_JOURNAL_SYSTEM_ONLY))
return -EINVAL;
j = journal_new(flags, NULL);
if (!j)
return -ENOMEM;
r = add_search_paths(j);
if (r < 0)
goto fail;
*ret = j;
return 0;
fail:
sd_journal_close(j);
return r;
}
_public_ int sd_journal_open_directory(sd_journal **ret, const char *path, int flags) {
sd_journal *j;
int r;
if (!ret)
return -EINVAL;
if (!path || !path_is_absolute(path))
return -EINVAL;
if (flags != 0)
return -EINVAL;
j = journal_new(flags, path);
if (!j)
return -ENOMEM;
r = add_root_directory(j, path);
if (r < 0)
goto fail;
*ret = j;
return 0;
fail:
sd_journal_close(j);
return r;
}
_public_ void sd_journal_close(sd_journal *j) {
Directory *d;
JournalFile *f;
if (!j)
return;
while ((f = hashmap_steal_first(j->files)))
journal_file_close(f);
hashmap_free(j->files);
while ((d = hashmap_first(j->directories_by_path)))
remove_directory(j, d);
while ((d = hashmap_first(j->directories_by_wd)))
remove_directory(j, d);
hashmap_free(j->directories_by_path);
hashmap_free(j->directories_by_wd);
if (j->inotify_fd >= 0)
close_nointr_nofail(j->inotify_fd);
sd_journal_flush_matches(j);
if (j->mmap)
mmap_cache_unref(j->mmap);
free(j->path);
free(j->unique_field);
free(j);
}
_public_ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
Object *o;
JournalFile *f;
int r;
if (!j)
return -EINVAL;
if (!ret)
return -EINVAL;
f = j->current_file;
if (!f)
return -EADDRNOTAVAIL;
if (f->current_offset <= 0)
return -EADDRNOTAVAIL;
r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
if (r < 0)
return r;
*ret = le64toh(o->entry.realtime);
return 0;
}
_public_ int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *ret, sd_id128_t *ret_boot_id) {
Object *o;
JournalFile *f;
int r;
sd_id128_t id;
if (!j)
return -EINVAL;
f = j->current_file;
if (!f)
return -EADDRNOTAVAIL;
if (f->current_offset <= 0)
return -EADDRNOTAVAIL;
r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
if (r < 0)
return r;
if (ret_boot_id)
*ret_boot_id = o->entry.boot_id;
else {
r = sd_id128_get_boot(&id);
if (r < 0)
return r;
if (!sd_id128_equal(id, o->entry.boot_id))
return -ESTALE;
}
if (ret)
*ret = le64toh(o->entry.monotonic);
return 0;
}
static bool field_is_valid(const char *field) {
const char *p;
assert(field);
if (isempty(field))
return false;
if (startswith(field, "__"))
return false;
for (p = field; *p; p++) {
if (*p == '_')
continue;
if (*p >= 'A' && *p <= 'Z')
continue;
if (*p >= '0' && *p <= '9')
continue;
return false;
}
return true;
}
_public_ int sd_journal_get_data(sd_journal *j, const char *field, const void **data, size_t *size) {
JournalFile *f;
uint64_t i, n;
size_t field_length;
int r;
Object *o;
if (!j)
return -EINVAL;
if (!field)
return -EINVAL;
if (!data)
return -EINVAL;
if (!size)
return -EINVAL;
if (!field_is_valid(field))
return -EINVAL;
f = j->current_file;
if (!f)
return -EADDRNOTAVAIL;
if (f->current_offset <= 0)
return -EADDRNOTAVAIL;
r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
if (r < 0)
return r;
field_length = strlen(field);
n = journal_file_entry_n_items(o);
for (i = 0; i < n; i++) {
uint64_t p, l;
le64_t le_hash;
size_t t;
p = le64toh(o->entry.items[i].object_offset);
le_hash = o->entry.items[i].hash;
r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
if (r < 0)
return r;
if (le_hash != o->data.hash)
return -EBADMSG;
l = le64toh(o->object.size) - offsetof(Object, data.payload);
if (o->object.flags & OBJECT_COMPRESSED) {
#ifdef HAVE_XZ
if (uncompress_startswith(o->data.payload, l,
&f->compress_buffer, &f->compress_buffer_size,
field, field_length, '=')) {
uint64_t rsize;
if (!uncompress_blob(o->data.payload, l,
&f->compress_buffer, &f->compress_buffer_size, &rsize))
return -EBADMSG;
*data = f->compress_buffer;
*size = (size_t) rsize;
return 0;
}
#else
return -EPROTONOSUPPORT;
#endif
} else if (l >= field_length+1 &&
memcmp(o->data.payload, field, field_length) == 0 &&
o->data.payload[field_length] == '=') {
t = (size_t) l;
if ((uint64_t) t != l)
return -E2BIG;
*data = o->data.payload;
*size = t;
return 0;
}
r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
if (r < 0)
return r;
}
return -ENOENT;
}
static int return_data(JournalFile *f, Object *o, const void **data, size_t *size) {
size_t t;
uint64_t l;
l = le64toh(o->object.size) - offsetof(Object, data.payload);
t = (size_t) l;
/* We can't read objects larger than 4G on a 32bit machine */
if ((uint64_t) t != l)
return -E2BIG;
if (o->object.flags & OBJECT_COMPRESSED) {
#ifdef HAVE_XZ
uint64_t rsize;
if (!uncompress_blob(o->data.payload, l, &f->compress_buffer, &f->compress_buffer_size, &rsize))
return -EBADMSG;
*data = f->compress_buffer;
*size = (size_t) rsize;
#else
return -EPROTONOSUPPORT;
#endif
} else {
*data = o->data.payload;
*size = t;
}
return 0;
}
_public_ int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) {
JournalFile *f;
uint64_t p, n;
le64_t le_hash;
int r;
Object *o;
if (!j)
return -EINVAL;
if (!data)
return -EINVAL;
if (!size)
return -EINVAL;
f = j->current_file;
if (!f)
return -EADDRNOTAVAIL;
if (f->current_offset <= 0)
return -EADDRNOTAVAIL;
r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
if (r < 0)
return r;
n = journal_file_entry_n_items(o);
if (j->current_field >= n)
return 0;
p = le64toh(o->entry.items[j->current_field].object_offset);
le_hash = o->entry.items[j->current_field].hash;
r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
if (r < 0)
return r;
if (le_hash != o->data.hash)
return -EBADMSG;
r = return_data(f, o, data, size);
if (r < 0)
return r;
j->current_field ++;
return 1;
}
_public_ void sd_journal_restart_data(sd_journal *j) {
if (!j)
return;
j->current_field = 0;
}
_public_ int sd_journal_get_fd(sd_journal *j) {
int r;
if (!j)
return -EINVAL;
if (j->inotify_fd >= 0)
return j->inotify_fd;
r = allocate_inotify(j);
if (r < 0)
return r;
/* Iterate through all dirs again, to add them to the
* inotify */
if (j->path)
r = add_root_directory(j, j->path);
else
r = add_search_paths(j);
if (r < 0)
return r;
return j->inotify_fd;
}
static void process_inotify_event(sd_journal *j, struct inotify_event *e) {
Directory *d;
int r;
assert(j);
assert(e);
/* Is this a subdirectory we watch? */
d = hashmap_get(j->directories_by_wd, INT_TO_PTR(e->wd));
if (d) {
sd_id128_t id;
if (!(e->mask & IN_ISDIR) && e->len > 0 &&
(endswith(e->name, ".journal") ||
endswith(e->name, ".journal~"))) {
/* Event for a journal file */
if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
r = add_file(j, d->path, e->name);
if (r < 0)
log_debug("Failed to add file %s/%s: %s", d->path, e->name, strerror(-r));
} else if (e->mask & (IN_DELETE|IN_MOVED_FROM|IN_UNMOUNT)) {
r = remove_file(j, d->path, e->name);
if (r < 0)
log_debug("Failed to remove file %s/%s: %s", d->path, e->name, strerror(-r));
}
} else if (!d->is_root && e->len == 0) {
/* Event for a subdirectory */
if (e->mask & (IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT)) {
r = remove_directory(j, d);
if (r < 0)
log_debug("Failed to remove directory %s: %s", d->path, strerror(-r));
}
} else if (d->is_root && (e->mask & IN_ISDIR) && e->len > 0 && sd_id128_from_string(e->name, &id) >= 0) {
/* Event for root directory */
if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
r = add_directory(j, d->path, e->name);
if (r < 0)
log_debug("Failed to add directory %s/%s: %s", d->path, e->name, strerror(-r));
}
}
return;
}
if (e->mask & IN_IGNORED)
return;
log_warning("Unknown inotify event.");
}
static int determine_change(sd_journal *j) {
bool b;
assert(j);
b = j->current_invalidate_counter != j->last_invalidate_counter;
j->last_invalidate_counter = j->current_invalidate_counter;
return b ? SD_JOURNAL_INVALIDATE : SD_JOURNAL_APPEND;
}
_public_ int sd_journal_process(sd_journal *j) {
uint8_t buffer[sizeof(struct inotify_event) + FILENAME_MAX] _alignas_(struct inotify_event);
bool got_something = false;
if (!j)
return -EINVAL;
for (;;) {
struct inotify_event *e;
ssize_t l;
l = read(j->inotify_fd, buffer, sizeof(buffer));
if (l < 0) {
if (errno == EAGAIN || errno == EINTR)
return got_something ? determine_change(j) : SD_JOURNAL_NOP;
return -errno;
}
got_something = true;
e = (struct inotify_event*) buffer;
while (l > 0) {
size_t step;
process_inotify_event(j, e);
step = sizeof(struct inotify_event) + e->len;
assert(step <= (size_t) l);
e = (struct inotify_event*) ((uint8_t*) e + step);
l -= step;
}
}
return determine_change(j);
}
_public_ int sd_journal_wait(sd_journal *j, uint64_t timeout_usec) {
int r;
assert(j);
if (j->inotify_fd < 0) {
/* This is the first invocation, hence create the
* inotify watch */
r = sd_journal_get_fd(j);
if (r < 0)
return r;
/* The journal might have changed since the context
* object was created and we weren't watching before,
* hence don't wait for anything, and return
* immediately. */
return determine_change(j);
}
do {
r = fd_wait_for_event(j->inotify_fd, POLLIN, timeout_usec);
} while (r == -EINTR);
if (r < 0)
return r;
return sd_journal_process(j);
}
_public_ int sd_journal_get_cutoff_realtime_usec(sd_journal *j, uint64_t *from, uint64_t *to) {
Iterator i;
JournalFile *f;
bool first = true;
int r;
if (!j)
return -EINVAL;
if (!from && !to)
return -EINVAL;
HASHMAP_FOREACH(f, j->files, i) {
usec_t fr, t;
r = journal_file_get_cutoff_realtime_usec(f, &fr, &t);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
if (r == 0)
continue;
if (first) {
if (from)
*from = fr;
if (to)
*to = t;
first = false;
} else {
if (from)
*from = MIN(fr, *from);
if (to)
*to = MIN(t, *to);
}
}
return first ? 0 : 1;
}
_public_ int sd_journal_get_cutoff_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t *from, uint64_t *to) {
Iterator i;
JournalFile *f;
bool first = true;
int r;
if (!j)
return -EINVAL;
if (!from && !to)
return -EINVAL;
HASHMAP_FOREACH(f, j->files, i) {
usec_t fr, t;
r = journal_file_get_cutoff_monotonic_usec(f, boot_id, &fr, &t);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
if (r == 0)
continue;
if (first) {
if (from)
*from = fr;
if (to)
*to = t;
first = false;
} else {
if (from)
*from = MIN(fr, *from);
if (to)
*to = MIN(t, *to);
}
}
return first ? 0 : 1;
}
void journal_print_header(sd_journal *j) {
Iterator i;
JournalFile *f;
bool newline = false;
assert(j);
HASHMAP_FOREACH(f, j->files, i) {
if (newline)
putchar('\n');
else
newline = true;
journal_file_print_header(f);
}
}
_public_ int sd_journal_get_usage(sd_journal *j, uint64_t *bytes) {
Iterator i;
JournalFile *f;
uint64_t sum = 0;
if (!j)
return -EINVAL;
if (!bytes)
return -EINVAL;
HASHMAP_FOREACH(f, j->files, i) {
struct stat st;
if (fstat(f->fd, &st) < 0)
return -errno;
sum += (uint64_t) st.st_blocks * 512ULL;
}
*bytes = sum;
return 0;
}
_public_ int sd_journal_query_unique(sd_journal *j, const char *field) {
char *f;
if (!j)
return -EINVAL;
if (isempty(field))
return -EINVAL;
if (!field_is_valid(field))
return -EINVAL;
f = strdup(field);
if (!f)
return -ENOMEM;
free(j->unique_field);
j->unique_field = f;
j->unique_file = NULL;
j->unique_offset = 0;
return 0;
}
_public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l) {
Object *o;
size_t k;
int r;
if (!j)
return -EINVAL;
if (!data)
return -EINVAL;
if (!l)
return -EINVAL;
if (!j->unique_field)
return -EINVAL;
k = strlen(j->unique_field);
if (!j->unique_file) {
j->unique_file = hashmap_first(j->files);
if (!j->unique_file)
return 0;
j->unique_offset = 0;
}
for (;;) {
JournalFile *of;
Iterator i;
const void *odata;
size_t ol;
bool found;
/* Proceed to next data object in list the field's linked list */
if (j->unique_offset == 0) {
r = journal_file_find_field_object(j->unique_file, j->unique_field, k, &o, NULL);
if (r < 0)
return r;
j->unique_offset = r > 0 ? le64toh(o->field.head_data_offset) : 0;
} else {
r = journal_file_move_to_object(j->unique_file, OBJECT_DATA, j->unique_offset, &o);
if (r < 0)
return r;
j->unique_offset = le64toh(o->data.next_field_offset);
}
/* We reached the end of the list? Then start again, with the next file */
if (j->unique_offset == 0) {
JournalFile *n;
n = hashmap_next(j->files, j->unique_file->path);
if (!n)
return 0;
j->unique_file = n;
continue;
}
/* We do not use the type context here, but 0 instead,
* so that we can look at this data object at the same
* time as one on another file */
r = journal_file_move_to_object(j->unique_file, 0, j->unique_offset, &o);
if (r < 0)
return r;
/* Let's do the type check by hand, since we used 0 context above. */
if (o->object.type != OBJECT_DATA)
return -EBADMSG;
r = return_data(j->unique_file, o, &odata, &ol);
if (r < 0)
return r;
/* OK, now let's see if we already returned this data
* object by checking if it exists in the earlier
* traversed files. */
found = false;
HASHMAP_FOREACH(of, j->files, i) {
Object *oo;
uint64_t op;
if (of == j->unique_file)
break;
/* Skip this file it didn't have any fields
* indexed */
if (JOURNAL_HEADER_CONTAINS(of->header, n_fields) &&
le64toh(of->header->n_fields) <= 0)
continue;
r = journal_file_find_data_object_with_hash(of, odata, ol, le64toh(o->data.hash), &oo, &op);
if (r < 0)
return r;
if (r > 0)
found = true;
}
if (found)
continue;
r = return_data(j->unique_file, o, data, l);
if (r < 0)
return r;
return 1;
}
}
_public_ void sd_journal_restart_unique(sd_journal *j) {
if (!j)
return;
j->unique_file = NULL;
j->unique_offset = 0;
}