/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see .
***/
#include
#include
#include
#include
#include
#include
#include "sd-journal.h"
#include "journal-def.h"
#include "journal-file.h"
#include "hashmap.h"
#include "list.h"
#include "path-util.h"
#include "lookup3.h"
#include "compress.h"
#include "journal-internal.h"
#define JOURNAL_FILES_MAX 1024
static void detach_location(sd_journal *j) {
Iterator i;
JournalFile *f;
assert(j);
j->current_file = NULL;
j->current_field = 0;
HASHMAP_FOREACH(f, j->files, i)
f->current_offset = 0;
}
static void reset_location(sd_journal *j) {
assert(j);
detach_location(j);
zero(j->current_location);
}
static void init_location(Location *l, LocationType type, JournalFile *f, Object *o) {
assert(l);
assert(type == LOCATION_DISCRETE || type == LOCATION_SEEK);
assert(f);
assert(o->object.type == OBJECT_ENTRY);
l->type = type;
l->seqnum = le64toh(o->entry.seqnum);
l->seqnum_id = f->header->seqnum_id;
l->realtime = le64toh(o->entry.realtime);
l->monotonic = le64toh(o->entry.monotonic);
l->boot_id = o->entry.boot_id;
l->xor_hash = le64toh(o->entry.xor_hash);
l->seqnum_set = l->realtime_set = l->monotonic_set = l->xor_hash_set = true;
}
static void set_location(sd_journal *j, LocationType type, JournalFile *f, Object *o, uint64_t offset) {
assert(j);
assert(type == LOCATION_DISCRETE || type == LOCATION_SEEK);
assert(f);
assert(o);
init_location(&j->current_location, type, f, o);
j->current_file = f;
j->current_field = 0;
f->current_offset = offset;
}
static int match_is_valid(const void *data, size_t size) {
const char *b, *p;
assert(data);
if (size < 2)
return false;
if (startswith(data, "__"))
return false;
b = data;
for (p = b; p < b + size; p++) {
if (*p == '=')
return p > b;
if (*p == '_')
continue;
if (*p >= 'A' && *p <= 'Z')
continue;
if (*p >= '0' && *p <= '9')
continue;
return false;
}
return false;
}
static bool same_field(const void *_a, size_t s, const void *_b, size_t t) {
const uint8_t *a = _a, *b = _b;
size_t j;
for (j = 0; j < s && j < t; j++) {
if (a[j] != b[j])
return false;
if (a[j] == '=')
return true;
}
return true;
}
static Match *match_new(Match *p, MatchType t) {
Match *m;
m = new0(Match, 1);
if (!m)
return NULL;
m->type = t;
if (p) {
m->parent = p;
LIST_PREPEND(Match, matches, p->matches, m);
}
return m;
}
static void match_free(Match *m) {
assert(m);
while (m->matches)
match_free(m->matches);
if (m->parent)
LIST_REMOVE(Match, matches, m->parent->matches, m);
free(m->data);
free(m);
}
static void match_free_if_empty(Match *m) {
assert(m);
if (m->matches)
return;
match_free(m);
}
_public_ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
Match *l2, *l3, *add_here = NULL, *m;
le64_t le_hash;
if (!j)
return -EINVAL;
if (!data)
return -EINVAL;
if (size == 0)
size = strlen(data);
if (!match_is_valid(data, size))
return -EINVAL;
/* level 0: OR term
* level 1: AND terms
* level 2: OR terms
* level 3: concrete matches */
if (!j->level0) {
j->level0 = match_new(NULL, MATCH_OR_TERM);
if (!j->level0)
return -ENOMEM;
}
if (!j->level1) {
j->level1 = match_new(j->level0, MATCH_AND_TERM);
if (!j->level1)
return -ENOMEM;
}
assert(j->level0->type == MATCH_OR_TERM);
assert(j->level1->type == MATCH_AND_TERM);
le_hash = htole64(hash64(data, size));
LIST_FOREACH(matches, l2, j->level1->matches) {
assert(l2->type == MATCH_OR_TERM);
LIST_FOREACH(matches, l3, l2->matches) {
assert(l3->type == MATCH_DISCRETE);
/* Exactly the same match already? Then ignore
* this addition */
if (l3->le_hash == le_hash &&
l3->size == size &&
memcmp(l3->data, data, size) == 0)
return 0;
/* Same field? Then let's add this to this OR term */
if (same_field(data, size, l3->data, l3->size)) {
add_here = l2;
break;
}
}
if (add_here)
break;
}
if (!add_here) {
add_here = match_new(j->level1, MATCH_OR_TERM);
if (!add_here)
goto fail;
}
m = match_new(add_here, MATCH_DISCRETE);
if (!m)
goto fail;
m->le_hash = le_hash;
m->size = size;
m->data = memdup(data, size);
if (!m->data)
goto fail;
detach_location(j);
return 0;
fail:
if (add_here)
match_free_if_empty(add_here);
if (j->level1)
match_free_if_empty(j->level1);
if (j->level0)
match_free_if_empty(j->level0);
return -ENOMEM;
}
_public_ int sd_journal_add_disjunction(sd_journal *j) {
Match *m;
assert(j);
if (!j->level0)
return 0;
if (!j->level1)
return 0;
if (!j->level1->matches)
return 0;
m = match_new(j->level0, MATCH_AND_TERM);
if (!m)
return -ENOMEM;
j->level1 = m;
return 0;
}
static char *match_make_string(Match *m) {
char *p, *r;
Match *i;
bool enclose = false;
if (!m)
return strdup("");
if (m->type == MATCH_DISCRETE)
return strndup(m->data, m->size);
p = NULL;
LIST_FOREACH(matches, i, m->matches) {
char *t, *k;
t = match_make_string(i);
if (!t) {
free(p);
return NULL;
}
if (p) {
k = strjoin(p, m->type == MATCH_OR_TERM ? " OR " : " AND ", t, NULL);
free(p);
free(t);
if (!k)
return NULL;
p = k;
enclose = true;
} else {
free(p);
p = t;
}
}
if (enclose) {
r = strjoin("(", p, ")", NULL);
free(p);
return r;
}
return p;
}
char *journal_make_match_string(sd_journal *j) {
assert(j);
return match_make_string(j->level0);
}
_public_ void sd_journal_flush_matches(sd_journal *j) {
if (!j)
return;
if (j->level0)
match_free(j->level0);
j->level0 = j->level1 = NULL;
detach_location(j);
}
static int compare_entry_order(JournalFile *af, Object *_ao,
JournalFile *bf, uint64_t bp) {
uint64_t a, b;
Object *ao, *bo;
int r;
assert(af);
assert(bf);
assert(_ao);
/* The mmap cache might invalidate the object from the first
* file if we look at the one from the second file. Hence
* temporarily copy the header of the first one, and look at
* that only. */
ao = alloca(offsetof(EntryObject, items));
memcpy(ao, _ao, offsetof(EntryObject, items));
r = journal_file_move_to_object(bf, OBJECT_ENTRY, bp, &bo);
if (r < 0)
return strcmp(af->path, bf->path);
/* We operate on two different files here, hence we can access
* two objects at the same time, which we normally can't.
*
* If contents and timestamps match, these entries are
* identical, even if the seqnum does not match */
if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id) &&
ao->entry.monotonic == bo->entry.monotonic &&
ao->entry.realtime == bo->entry.realtime &&
ao->entry.xor_hash == bo->entry.xor_hash)
return 0;
if (sd_id128_equal(af->header->seqnum_id, bf->header->seqnum_id)) {
/* If this is from the same seqnum source, compare
* seqnums */
a = le64toh(ao->entry.seqnum);
b = le64toh(bo->entry.seqnum);
if (a < b)
return -1;
if (a > b)
return 1;
/* Wow! This is weird, different data but the same
* seqnums? Something is borked, but let's make the
* best of it and compare by time. */
}
if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id)) {
/* If the boot id matches compare monotonic time */
a = le64toh(ao->entry.monotonic);
b = le64toh(bo->entry.monotonic);
if (a < b)
return -1;
if (a > b)
return 1;
}
/* Otherwise compare UTC time */
a = le64toh(ao->entry.realtime);
b = le64toh(bo->entry.realtime);
if (a < b)
return -1;
if (a > b)
return 1;
/* Finally, compare by contents */
a = le64toh(ao->entry.xor_hash);
b = le64toh(bo->entry.xor_hash);
if (a < b)
return -1;
if (a > b)
return 1;
return 0;
}
static int compare_with_location(JournalFile *af, Object *ao, Location *l) {
uint64_t a;
assert(af);
assert(ao);
assert(l);
assert(l->type == LOCATION_DISCRETE || l->type == LOCATION_SEEK);
if (l->monotonic_set &&
sd_id128_equal(ao->entry.boot_id, l->boot_id) &&
l->realtime_set &&
le64toh(ao->entry.realtime) == l->realtime &&
l->xor_hash_set &&
le64toh(ao->entry.xor_hash) == l->xor_hash)
return 0;
if (l->seqnum_set &&
sd_id128_equal(af->header->seqnum_id, l->seqnum_id)) {
a = le64toh(ao->entry.seqnum);
if (a < l->seqnum)
return -1;
if (a > l->seqnum)
return 1;
}
if (l->monotonic_set &&
sd_id128_equal(ao->entry.boot_id, l->boot_id)) {
a = le64toh(ao->entry.monotonic);
if (a < l->monotonic)
return -1;
if (a > l->monotonic)
return 1;
}
if (l->realtime_set) {
a = le64toh(ao->entry.realtime);
if (a < l->realtime)
return -1;
if (a > l->realtime)
return 1;
}
if (l->xor_hash_set) {
a = le64toh(ao->entry.xor_hash);
if (a < l->xor_hash)
return -1;
if (a > l->xor_hash)
return 1;
}
return 0;
}
static int next_for_match(
sd_journal *j,
Match *m,
JournalFile *f,
uint64_t after_offset,
direction_t direction,
Object **ret,
uint64_t *offset) {
int r;
uint64_t np = 0;
Object *n;
assert(j);
assert(m);
assert(f);
if (m->type == MATCH_DISCRETE) {
uint64_t dp;
r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), NULL, &dp);
if (r <= 0)
return r;
return journal_file_move_to_entry_by_offset_for_data(f, dp, after_offset, direction, ret, offset);
} else if (m->type == MATCH_OR_TERM) {
Match *i;
/* Find the earliest match beyond after_offset */
LIST_FOREACH(matches, i, m->matches) {
uint64_t cp;
r = next_for_match(j, i, f, after_offset, direction, NULL, &cp);
if (r < 0)
return r;
else if (r > 0) {
if (np == 0 || (direction == DIRECTION_DOWN ? np > cp : np < cp))
np = cp;
}
}
} else if (m->type == MATCH_AND_TERM) {
Match *i;
bool continue_looking;
/* Always jump to the next matching entry and repeat
* this until we fine and offset that matches for all
* matches. */
if (!m->matches)
return 0;
np = 0;
do {
continue_looking = false;
LIST_FOREACH(matches, i, m->matches) {
uint64_t cp, limit;
if (np == 0)
limit = after_offset;
else if (direction == DIRECTION_DOWN)
limit = MAX(np, after_offset);
else
limit = MIN(np, after_offset);
r = next_for_match(j, i, f, limit, direction, NULL, &cp);
if (r <= 0)
return r;
if ((direction == DIRECTION_DOWN ? cp >= after_offset : cp <= after_offset) &&
(np == 0 || (direction == DIRECTION_DOWN ? cp > np : np < cp))) {
np = cp;
continue_looking = true;
}
}
} while (continue_looking);
}
if (np == 0)
return 0;
r = journal_file_move_to_object(f, OBJECT_ENTRY, np, &n);
if (r < 0)
return r;
if (ret)
*ret = n;
if (offset)
*offset = np;
return 1;
}
static int find_location_for_match(
sd_journal *j,
Match *m,
JournalFile *f,
direction_t direction,
Object **ret,
uint64_t *offset) {
int r;
assert(j);
assert(m);
assert(f);
if (m->type == MATCH_DISCRETE) {
uint64_t dp;
r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), NULL, &dp);
if (r <= 0)
return r;
/* FIXME: missing: find by monotonic */
if (j->current_location.type == LOCATION_HEAD)
return journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_DOWN, ret, offset);
if (j->current_location.type == LOCATION_TAIL)
return journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_UP, ret, offset);
if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
return journal_file_move_to_entry_by_seqnum_for_data(f, dp, j->current_location.seqnum, direction, ret, offset);
if (j->current_location.monotonic_set) {
r = journal_file_move_to_entry_by_monotonic_for_data(f, dp, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
if (r != -ENOENT)
return r;
}
if (j->current_location.realtime_set)
return journal_file_move_to_entry_by_realtime_for_data(f, dp, j->current_location.realtime, direction, ret, offset);
return journal_file_next_entry_for_data(f, NULL, 0, dp, direction, ret, offset);
} else if (m->type == MATCH_OR_TERM) {
uint64_t np = 0;
Object *n;
Match *i;
/* Find the earliest match */
LIST_FOREACH(matches, i, m->matches) {
uint64_t cp;
r = find_location_for_match(j, i, f, direction, NULL, &cp);
if (r < 0)
return r;
else if (r > 0) {
if (np == 0 || (direction == DIRECTION_DOWN ? np > cp : np < cp))
np = cp;
}
}
if (np == 0)
return 0;
r = journal_file_move_to_object(f, OBJECT_ENTRY, np, &n);
if (r < 0)
return r;
if (ret)
*ret = n;
if (offset)
*offset = np;
return 1;
} else {
Match *i;
uint64_t np = 0;
assert(m->type == MATCH_AND_TERM);
/* First jump to the last match, and then find the
* next one where all matches match */
if (!m->matches)
return 0;
LIST_FOREACH(matches, i, m->matches) {
uint64_t cp;
r = find_location_for_match(j, i, f, direction, NULL, &cp);
if (r <= 0)
return r;
if (np == 0 || (direction == DIRECTION_DOWN ? np < cp : np > cp))
np = cp;
}
return next_for_match(j, m, f, np, direction, ret, offset);
}
}
static int find_location_with_matches(
sd_journal *j,
JournalFile *f,
direction_t direction,
Object **ret,
uint64_t *offset) {
int r;
assert(j);
assert(f);
assert(ret);
assert(offset);
if (!j->level0) {
/* No matches is simple */
if (j->current_location.type == LOCATION_HEAD)
return journal_file_next_entry(f, NULL, 0, DIRECTION_DOWN, ret, offset);
if (j->current_location.type == LOCATION_TAIL)
return journal_file_next_entry(f, NULL, 0, DIRECTION_UP, ret, offset);
if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
return journal_file_move_to_entry_by_seqnum(f, j->current_location.seqnum, direction, ret, offset);
if (j->current_location.monotonic_set) {
r = journal_file_move_to_entry_by_monotonic(f, j->current_location.boot_id, j->current_location.monotonic, direction, ret, offset);
if (r != -ENOENT)
return r;
}
if (j->current_location.realtime_set)
return journal_file_move_to_entry_by_realtime(f, j->current_location.realtime, direction, ret, offset);
return journal_file_next_entry(f, NULL, 0, direction, ret, offset);
} else
return find_location_for_match(j, j->level0, f, direction, ret, offset);
}
static int next_with_matches(
sd_journal *j,
JournalFile *f,
direction_t direction,
Object **ret,
uint64_t *offset) {
Object *c;
uint64_t cp;
assert(j);
assert(f);
assert(ret);
assert(offset);
c = *ret;
cp = *offset;
/* No matches is easy. We simple advance the file
* pointer by one. */
if (!j->level0)
return journal_file_next_entry(f, c, cp, direction, ret, offset);
/* If we have a match then we look for the next matching entry
* with an offset at least one step larger */
return next_for_match(j, j->level0, f, direction == DIRECTION_DOWN ? cp+1 : cp-1, direction, ret, offset);
}
static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) {
Object *c;
uint64_t cp;
int r;
assert(j);
assert(f);
if (f->current_offset > 0) {
cp = f->current_offset;
r = journal_file_move_to_object(f, OBJECT_ENTRY, cp, &c);
if (r < 0)
return r;
r = next_with_matches(j, f, direction, &c, &cp);
if (r <= 0)
return r;
} else {
r = find_location_with_matches(j, f, direction, &c, &cp);
if (r <= 0)
return r;
}
/* OK, we found the spot, now let's advance until to an entry
* that is actually different from what we were previously
* looking at. This is necessary to handle entries which exist
* in two (or more) journal files, and which shall all be
* suppressed but one. */
for (;;) {
bool found;
if (j->current_location.type == LOCATION_DISCRETE) {
int k;
k = compare_with_location(f, c, &j->current_location);
if (direction == DIRECTION_DOWN)
found = k > 0;
else
found = k < 0;
} else
found = true;
if (found) {
if (ret)
*ret = c;
if (offset)
*offset = cp;
return 1;
}
r = next_with_matches(j, f, direction, &c, &cp);
if (r <= 0)
return r;
}
}
static int real_journal_next(sd_journal *j, direction_t direction) {
JournalFile *f, *new_file = NULL;
uint64_t new_offset = 0;
Object *o;
uint64_t p;
Iterator i;
int r;
if (!j)
return -EINVAL;
HASHMAP_FOREACH(f, j->files, i) {
bool found;
r = next_beyond_location(j, f, direction, &o, &p);
if (r < 0) {
log_debug("Can't iterate through %s, ignoring: %s", f->path, strerror(-r));
continue;
} else if (r == 0)
continue;
if (!new_file)
found = true;
else {
int k;
k = compare_entry_order(f, o, new_file, new_offset);
if (direction == DIRECTION_DOWN)
found = k < 0;
else
found = k > 0;
}
if (found) {
new_file = f;
new_offset = p;
}
}
if (!new_file)
return 0;
r = journal_file_move_to_object(new_file, OBJECT_ENTRY, new_offset, &o);
if (r < 0)
return r;
set_location(j, LOCATION_DISCRETE, new_file, o, new_offset);
return 1;
}
_public_ int sd_journal_next(sd_journal *j) {
return real_journal_next(j, DIRECTION_DOWN);
}
_public_ int sd_journal_previous(sd_journal *j) {
return real_journal_next(j, DIRECTION_UP);
}
static int real_journal_next_skip(sd_journal *j, direction_t direction, uint64_t skip) {
int c = 0, r;
if (!j)
return -EINVAL;
if (skip == 0) {
/* If this is not a discrete skip, then at least
* resolve the current location */
if (j->current_location.type != LOCATION_DISCRETE)
return real_journal_next(j, direction);
return 0;
}
do {
r = real_journal_next(j, direction);
if (r < 0)
return r;
if (r == 0)
return c;
skip--;
c++;
} while (skip > 0);
return c;
}
_public_ int sd_journal_next_skip(sd_journal *j, uint64_t skip) {
return real_journal_next_skip(j, DIRECTION_DOWN, skip);
}
_public_ int sd_journal_previous_skip(sd_journal *j, uint64_t skip) {
return real_journal_next_skip(j, DIRECTION_UP, skip);
}
_public_ int sd_journal_get_cursor(sd_journal *j, char **cursor) {
Object *o;
int r;
char bid[33], sid[33];
if (!j)
return -EINVAL;
if (!cursor)
return -EINVAL;
if (!j->current_file || j->current_file->current_offset <= 0)
return -EADDRNOTAVAIL;
r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
if (r < 0)
return r;
sd_id128_to_string(j->current_file->header->seqnum_id, sid);
sd_id128_to_string(o->entry.boot_id, bid);
if (asprintf(cursor,
"s=%s;i=%llx;b=%s;m=%llx;t=%llx;x=%llx",
sid, (unsigned long long) le64toh(o->entry.seqnum),
bid, (unsigned long long) le64toh(o->entry.monotonic),
(unsigned long long) le64toh(o->entry.realtime),
(unsigned long long) le64toh(o->entry.xor_hash)) < 0)
return -ENOMEM;
return 1;
}
_public_ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
char *w, *state;
size_t l;
unsigned long long seqnum, monotonic, realtime, xor_hash;
bool
seqnum_id_set = false,
seqnum_set = false,
boot_id_set = false,
monotonic_set = false,
realtime_set = false,
xor_hash_set = false;
sd_id128_t seqnum_id, boot_id;
if (!j)
return -EINVAL;
if (isempty(cursor))
return -EINVAL;
FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
char *item;
int k = 0;
if (l < 2 || w[1] != '=')
return -EINVAL;
item = strndup(w, l);
if (!item)
return -ENOMEM;
switch (w[0]) {
case 's':
seqnum_id_set = true;
k = sd_id128_from_string(item+2, &seqnum_id);
break;
case 'i':
seqnum_set = true;
if (sscanf(item+2, "%llx", &seqnum) != 1)
k = -EINVAL;
break;
case 'b':
boot_id_set = true;
k = sd_id128_from_string(item+2, &boot_id);
break;
case 'm':
monotonic_set = true;
if (sscanf(item+2, "%llx", &monotonic) != 1)
k = -EINVAL;
break;
case 't':
realtime_set = true;
if (sscanf(item+2, "%llx", &realtime) != 1)
k = -EINVAL;
break;
case 'x':
xor_hash_set = true;
if (sscanf(item+2, "%llx", &xor_hash) != 1)
k = -EINVAL;
break;
}
free(item);
if (k < 0)
return k;
}
if ((!seqnum_set || !seqnum_id_set) &&
(!monotonic_set || !boot_id_set) &&
!realtime_set)
return -EINVAL;
reset_location(j);
j->current_location.type = LOCATION_SEEK;
if (realtime_set) {
j->current_location.realtime = (uint64_t) realtime;
j->current_location.realtime_set = true;
}
if (seqnum_set && seqnum_id_set) {
j->current_location.seqnum = (uint64_t) seqnum;
j->current_location.seqnum_id = seqnum_id;
j->current_location.seqnum_set = true;
}
if (monotonic_set && boot_id_set) {
j->current_location.monotonic = (uint64_t) monotonic;
j->current_location.boot_id = boot_id;
j->current_location.monotonic_set = true;
}
if (xor_hash_set) {
j->current_location.xor_hash = (uint64_t) xor_hash;
j->current_location.xor_hash_set = true;
}
return 0;
}
_public_ int sd_journal_test_cursor(sd_journal *j, const char *cursor) {
int r;
char *w, *state;
size_t l;
Object *o;
if (!j)
return -EINVAL;
if (isempty(cursor))
return -EINVAL;
if (!j->current_file || j->current_file->current_offset <= 0)
return -EADDRNOTAVAIL;
r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
if (r < 0)
return r;
FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
_cleanup_free_ char *item = NULL;
sd_id128_t id;
unsigned long long ll;
int k = 0;
if (l < 2 || w[1] != '=')
return -EINVAL;
item = strndup(w, l);
if (!item)
return -ENOMEM;
switch (w[0]) {
case 's':
k = sd_id128_from_string(item+2, &id);
if (k < 0)
return k;
if (!sd_id128_equal(id, j->current_file->header->seqnum_id))
return 0;
break;
case 'i':
if (sscanf(item+2, "%llx", &ll) != 1)
return -EINVAL;
if (ll != le64toh(o->entry.seqnum))
return 0;
break;
case 'b':
k = sd_id128_from_string(item+2, &id);
if (k < 0)
return k;
if (!sd_id128_equal(id, o->entry.boot_id))
return 0;
break;
case 'm':
if (sscanf(item+2, "%llx", &ll) != 1)
return -EINVAL;
if (ll != le64toh(o->entry.monotonic))
return 0;
break;
case 't':
if (sscanf(item+2, "%llx", &ll) != 1)
return -EINVAL;
if (ll != le64toh(o->entry.realtime))
return 0;
break;
case 'x':
if (sscanf(item+2, "%llx", &ll) != 1)
return -EINVAL;
if (ll != le64toh(o->entry.xor_hash))
return 0;
break;
}
}
return 1;
}
_public_ int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t usec) {
if (!j)
return -EINVAL;
reset_location(j);
j->current_location.type = LOCATION_SEEK;
j->current_location.boot_id = boot_id;
j->current_location.monotonic = usec;
j->current_location.monotonic_set = true;
return 0;
}
_public_ int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec) {
if (!j)
return -EINVAL;
reset_location(j);
j->current_location.type = LOCATION_SEEK;
j->current_location.realtime = usec;
j->current_location.realtime_set = true;
return 0;
}
_public_ int sd_journal_seek_head(sd_journal *j) {
if (!j)
return -EINVAL;
reset_location(j);
j->current_location.type = LOCATION_HEAD;
return 0;
}
_public_ int sd_journal_seek_tail(sd_journal *j) {
if (!j)
return -EINVAL;
reset_location(j);
j->current_location.type = LOCATION_TAIL;
return 0;
}
static 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;
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;
}