forked from systemd/systemd
/
journald-server.c
1855 lines (1451 loc) · 63.2 KB
/
journald-server.c
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/*-*- 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 <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
#endif
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/signalfd.h>
#include <sys/statvfs.h>
#include <linux/sockios.h>
#include "libudev.h"
#include "sd-daemon.h"
#include "sd-journal.h"
#include "sd-messages.h"
#include "acl-util.h"
#include "alloc-util.h"
#include "audit-util.h"
#include "cgroup-util.h"
#include "conf-parser.h"
#include "dirent-util.h"
#include "extract-word.h"
#include "fd-util.h"
#include "formats-util.h"
#include "fs-util.h"
#include "hashmap.h"
#include "hostname-util.h"
#include "io-util.h"
#include "journal-authenticate.h"
#include "journal-file.h"
#include "journal-internal.h"
#include "journal-vacuum.h"
#include "journald-audit.h"
#include "journald-kmsg.h"
#include "journald-native.h"
#include "journald-rate-limit.h"
#include "journald-server.h"
#include "journald-stream.h"
#include "journald-syslog.h"
#include "missing.h"
#include "mkdir.h"
#include "parse-util.h"
#include "proc-cmdline.h"
#include "process-util.h"
#include "rm-rf.h"
#include "selinux-util.h"
#include "signal-util.h"
#include "socket-util.h"
#include "string-table.h"
#include "string-util.h"
#define USER_JOURNALS_MAX 1024
#define DEFAULT_SYNC_INTERVAL_USEC (5*USEC_PER_MINUTE)
#define DEFAULT_RATE_LIMIT_INTERVAL (30*USEC_PER_SEC)
#define DEFAULT_RATE_LIMIT_BURST 1000
#define DEFAULT_MAX_FILE_USEC USEC_PER_MONTH
#define RECHECK_SPACE_USEC (30*USEC_PER_SEC)
#define NOTIFY_SNDBUF_SIZE (8*1024*1024)
static int determine_space_for(
Server *s,
JournalMetrics *metrics,
const char *path,
const char *name,
bool verbose,
bool patch_min_use,
uint64_t *available,
uint64_t *limit) {
uint64_t sum = 0, ss_avail, avail;
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
struct statvfs ss;
const char *p;
usec_t ts;
assert(s);
assert(metrics);
assert(path);
assert(name);
ts = now(CLOCK_MONOTONIC);
if (!verbose && s->cached_space_timestamp + RECHECK_SPACE_USEC > ts) {
if (available)
*available = s->cached_space_available;
if (limit)
*limit = s->cached_space_limit;
return 0;
}
p = strjoina(path, SERVER_MACHINE_ID(s));
d = opendir(p);
if (!d)
return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno, "Failed to open %s: %m", p);
if (fstatvfs(dirfd(d), &ss) < 0)
return log_error_errno(errno, "Failed to fstatvfs(%s): %m", p);
FOREACH_DIRENT_ALL(de, d, break) {
struct stat st;
if (!endswith(de->d_name, ".journal") &&
!endswith(de->d_name, ".journal~"))
continue;
if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
log_debug_errno(errno, "Failed to stat %s/%s, ignoring: %m", p, de->d_name);
continue;
}
if (!S_ISREG(st.st_mode))
continue;
sum += (uint64_t) st.st_blocks * 512UL;
}
/* If request, then let's bump the min_use limit to the
* current usage on disk. We do this when starting up and
* first opening the journal files. This way sudden spikes in
* disk usage will not cause journald to vacuum files without
* bounds. Note that this means that only a restart of
* journald will make it reset this value. */
if (patch_min_use)
metrics->min_use = MAX(metrics->min_use, sum);
ss_avail = ss.f_bsize * ss.f_bavail;
avail = LESS_BY(ss_avail, metrics->keep_free);
s->cached_space_limit = MIN(MAX(sum + avail, metrics->min_use), metrics->max_use);
s->cached_space_available = LESS_BY(s->cached_space_limit, sum);
s->cached_space_timestamp = ts;
if (verbose) {
char fb1[FORMAT_BYTES_MAX], fb2[FORMAT_BYTES_MAX], fb3[FORMAT_BYTES_MAX],
fb4[FORMAT_BYTES_MAX], fb5[FORMAT_BYTES_MAX], fb6[FORMAT_BYTES_MAX];
server_driver_message(s, SD_MESSAGE_JOURNAL_USAGE,
"%s (%s) is currently using %s.\n"
"Maximum allowed usage is set to %s.\n"
"Leaving at least %s free (of currently available %s of space).\n"
"Enforced usage limit is thus %s, of which %s are still available.",
name, path,
format_bytes(fb1, sizeof(fb1), sum),
format_bytes(fb2, sizeof(fb2), metrics->max_use),
format_bytes(fb3, sizeof(fb3), metrics->keep_free),
format_bytes(fb4, sizeof(fb4), ss_avail),
format_bytes(fb5, sizeof(fb5), s->cached_space_limit),
format_bytes(fb6, sizeof(fb6), s->cached_space_available));
}
if (available)
*available = s->cached_space_available;
if (limit)
*limit = s->cached_space_limit;
return 1;
}
static int determine_space(Server *s, bool verbose, bool patch_min_use, uint64_t *available, uint64_t *limit) {
JournalMetrics *metrics;
const char *path, *name;
assert(s);
if (s->system_journal) {
path = "/var/log/journal/";
metrics = &s->system_metrics;
name = "System journal";
} else {
path = "/run/log/journal/";
metrics = &s->runtime_metrics;
name = "Runtime journal";
}
return determine_space_for(s, metrics, path, name, verbose, patch_min_use, available, limit);
}
void server_fix_perms(Server *s, JournalFile *f, uid_t uid) {
int r;
#ifdef HAVE_ACL
_cleanup_(acl_freep) acl_t acl = NULL;
acl_entry_t entry;
acl_permset_t permset;
#endif
assert(f);
r = fchmod(f->fd, 0640);
if (r < 0)
log_warning_errno(errno, "Failed to fix access mode on %s, ignoring: %m", f->path);
#ifdef HAVE_ACL
if (uid <= SYSTEM_UID_MAX)
return;
acl = acl_get_fd(f->fd);
if (!acl) {
log_warning_errno(errno, "Failed to read ACL on %s, ignoring: %m", f->path);
return;
}
r = acl_find_uid(acl, uid, &entry);
if (r <= 0) {
if (acl_create_entry(&acl, &entry) < 0 ||
acl_set_tag_type(entry, ACL_USER) < 0 ||
acl_set_qualifier(entry, &uid) < 0) {
log_warning_errno(errno, "Failed to patch ACL on %s, ignoring: %m", f->path);
return;
}
}
/* We do not recalculate the mask unconditionally here,
* so that the fchmod() mask above stays intact. */
if (acl_get_permset(entry, &permset) < 0 ||
acl_add_perm(permset, ACL_READ) < 0 ||
calc_acl_mask_if_needed(&acl) < 0) {
log_warning_errno(errno, "Failed to patch ACL on %s, ignoring: %m", f->path);
return;
}
if (acl_set_fd(f->fd, acl) < 0)
log_warning_errno(errno, "Failed to set ACL on %s, ignoring: %m", f->path);
#endif
}
static JournalFile* find_journal(Server *s, uid_t uid) {
_cleanup_free_ char *p = NULL;
int r;
JournalFile *f;
sd_id128_t machine;
assert(s);
/* We split up user logs only on /var, not on /run. If the
* runtime file is open, we write to it exclusively, in order
* to guarantee proper order as soon as we flush /run to
* /var and close the runtime file. */
if (s->runtime_journal)
return s->runtime_journal;
if (uid <= SYSTEM_UID_MAX)
return s->system_journal;
r = sd_id128_get_machine(&machine);
if (r < 0)
return s->system_journal;
f = ordered_hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
if (f)
return f;
if (asprintf(&p, "/var/log/journal/" SD_ID128_FORMAT_STR "/user-"UID_FMT".journal",
SD_ID128_FORMAT_VAL(machine), uid) < 0)
return s->system_journal;
while (ordered_hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
/* Too many open? Then let's close one */
f = ordered_hashmap_steal_first(s->user_journals);
assert(f);
journal_file_close(f);
}
r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, NULL, &f);
if (r < 0)
return s->system_journal;
server_fix_perms(s, f, uid);
r = ordered_hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
if (r < 0) {
journal_file_close(f);
return s->system_journal;
}
return f;
}
static int do_rotate(
Server *s,
JournalFile **f,
const char* name,
bool seal,
uint32_t uid) {
int r;
assert(s);
if (!*f)
return -EINVAL;
r = journal_file_rotate(f, s->compress, seal);
if (r < 0)
if (*f)
log_error_errno(r, "Failed to rotate %s: %m", (*f)->path);
else
log_error_errno(r, "Failed to create new %s journal: %m", name);
else
server_fix_perms(s, *f, uid);
return r;
}
void server_rotate(Server *s) {
JournalFile *f;
void *k;
Iterator i;
int r;
log_debug("Rotating...");
(void) do_rotate(s, &s->runtime_journal, "runtime", false, 0);
(void) do_rotate(s, &s->system_journal, "system", s->seal, 0);
ORDERED_HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
r = do_rotate(s, &f, "user", s->seal, PTR_TO_UINT32(k));
if (r >= 0)
ordered_hashmap_replace(s->user_journals, k, f);
else if (!f)
/* Old file has been closed and deallocated */
ordered_hashmap_remove(s->user_journals, k);
}
}
void server_sync(Server *s) {
JournalFile *f;
void *k;
Iterator i;
int r;
if (s->system_journal) {
r = journal_file_set_offline(s->system_journal);
if (r < 0)
log_warning_errno(r, "Failed to sync system journal, ignoring: %m");
}
ORDERED_HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
r = journal_file_set_offline(f);
if (r < 0)
log_warning_errno(r, "Failed to sync user journal, ignoring: %m");
}
if (s->sync_event_source) {
r = sd_event_source_set_enabled(s->sync_event_source, SD_EVENT_OFF);
if (r < 0)
log_error_errno(r, "Failed to disable sync timer source: %m");
}
s->sync_scheduled = false;
}
static void do_vacuum(
Server *s,
JournalFile *f,
JournalMetrics *metrics,
const char *path,
const char *name,
bool verbose,
bool patch_min_use) {
const char *p;
uint64_t limit;
int r;
assert(s);
assert(metrics);
assert(path);
assert(name);
if (!f)
return;
p = strjoina(path, SERVER_MACHINE_ID(s));
limit = metrics->max_use;
(void) determine_space_for(s, metrics, path, name, verbose, patch_min_use, NULL, &limit);
r = journal_directory_vacuum(p, limit, metrics->n_max_files, s->max_retention_usec, &s->oldest_file_usec, verbose);
if (r < 0 && r != -ENOENT)
log_warning_errno(r, "Failed to vacuum %s, ignoring: %m", p);
}
int server_vacuum(Server *s, bool verbose, bool patch_min_use) {
assert(s);
log_debug("Vacuuming...");
s->oldest_file_usec = 0;
do_vacuum(s, s->system_journal, &s->system_metrics, "/var/log/journal/", "System journal", verbose, patch_min_use);
do_vacuum(s, s->runtime_journal, &s->runtime_metrics, "/run/log/journal/", "Runtime journal", verbose, patch_min_use);
s->cached_space_limit = 0;
s->cached_space_available = 0;
s->cached_space_timestamp = 0;
return 0;
}
static void server_cache_machine_id(Server *s) {
sd_id128_t id;
int r;
assert(s);
r = sd_id128_get_machine(&id);
if (r < 0)
return;
sd_id128_to_string(id, stpcpy(s->machine_id_field, "_MACHINE_ID="));
}
static void server_cache_boot_id(Server *s) {
sd_id128_t id;
int r;
assert(s);
r = sd_id128_get_boot(&id);
if (r < 0)
return;
sd_id128_to_string(id, stpcpy(s->boot_id_field, "_BOOT_ID="));
}
static void server_cache_hostname(Server *s) {
_cleanup_free_ char *t = NULL;
char *x;
assert(s);
t = gethostname_malloc();
if (!t)
return;
x = strappend("_HOSTNAME=", t);
if (!x)
return;
free(s->hostname_field);
s->hostname_field = x;
}
static bool shall_try_append_again(JournalFile *f, int r) {
/* -E2BIG Hit configured limit
-EFBIG Hit fs limit
-EDQUOT Quota limit hit
-ENOSPC Disk full
-EIO I/O error of some kind (mmap)
-EHOSTDOWN Other machine
-EBUSY Unclean shutdown
-EPROTONOSUPPORT Unsupported feature
-EBADMSG Corrupted
-ENODATA Truncated
-ESHUTDOWN Already archived
-EIDRM Journal file has been deleted */
if (r == -E2BIG || r == -EFBIG || r == -EDQUOT || r == -ENOSPC)
log_debug("%s: Allocation limit reached, rotating.", f->path);
else if (r == -EHOSTDOWN)
log_info("%s: Journal file from other machine, rotating.", f->path);
else if (r == -EBUSY)
log_info("%s: Unclean shutdown, rotating.", f->path);
else if (r == -EPROTONOSUPPORT)
log_info("%s: Unsupported feature, rotating.", f->path);
else if (r == -EBADMSG || r == -ENODATA || r == ESHUTDOWN)
log_warning("%s: Journal file corrupted, rotating.", f->path);
else if (r == -EIO)
log_warning("%s: IO error, rotating.", f->path);
else if (r == -EIDRM)
log_warning("%s: Journal file has been deleted, rotating.", f->path);
else
return false;
return true;
}
static void write_to_journal(Server *s, uid_t uid, struct iovec *iovec, unsigned n, int priority) {
JournalFile *f;
bool vacuumed = false;
int r;
assert(s);
assert(iovec);
assert(n > 0);
f = find_journal(s, uid);
if (!f)
return;
if (journal_file_rotate_suggested(f, s->max_file_usec)) {
log_debug("%s: Journal header limits reached or header out-of-date, rotating.", f->path);
server_rotate(s);
server_vacuum(s, false, false);
vacuumed = true;
f = find_journal(s, uid);
if (!f)
return;
}
r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
if (r >= 0) {
server_schedule_sync(s, priority);
return;
}
if (vacuumed || !shall_try_append_again(f, r)) {
log_error_errno(r, "Failed to write entry (%d items, %zu bytes), ignoring: %m", n, IOVEC_TOTAL_SIZE(iovec, n));
return;
}
server_rotate(s);
server_vacuum(s, false, false);
f = find_journal(s, uid);
if (!f)
return;
log_debug("Retrying write.");
r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
if (r < 0)
log_error_errno(r, "Failed to write entry (%d items, %zu bytes) despite vacuuming, ignoring: %m", n, IOVEC_TOTAL_SIZE(iovec, n));
else
server_schedule_sync(s, priority);
}
static void dispatch_message_real(
Server *s,
struct iovec *iovec, unsigned n, unsigned m,
const struct ucred *ucred,
const struct timeval *tv,
const char *label, size_t label_len,
const char *unit_id,
int priority,
pid_t object_pid) {
char pid[sizeof("_PID=") + DECIMAL_STR_MAX(pid_t)],
uid[sizeof("_UID=") + DECIMAL_STR_MAX(uid_t)],
gid[sizeof("_GID=") + DECIMAL_STR_MAX(gid_t)],
owner_uid[sizeof("_SYSTEMD_OWNER_UID=") + DECIMAL_STR_MAX(uid_t)],
source_time[sizeof("_SOURCE_REALTIME_TIMESTAMP=") + DECIMAL_STR_MAX(usec_t)],
o_uid[sizeof("OBJECT_UID=") + DECIMAL_STR_MAX(uid_t)],
o_gid[sizeof("OBJECT_GID=") + DECIMAL_STR_MAX(gid_t)],
o_owner_uid[sizeof("OBJECT_SYSTEMD_OWNER_UID=") + DECIMAL_STR_MAX(uid_t)];
uid_t object_uid;
gid_t object_gid;
char *x;
int r;
char *t, *c;
uid_t realuid = 0, owner = 0, journal_uid;
bool owner_valid = false;
#ifdef HAVE_AUDIT
char audit_session[sizeof("_AUDIT_SESSION=") + DECIMAL_STR_MAX(uint32_t)],
audit_loginuid[sizeof("_AUDIT_LOGINUID=") + DECIMAL_STR_MAX(uid_t)],
o_audit_session[sizeof("OBJECT_AUDIT_SESSION=") + DECIMAL_STR_MAX(uint32_t)],
o_audit_loginuid[sizeof("OBJECT_AUDIT_LOGINUID=") + DECIMAL_STR_MAX(uid_t)];
uint32_t audit;
uid_t loginuid;
#endif
assert(s);
assert(iovec);
assert(n > 0);
assert(n + N_IOVEC_META_FIELDS + (object_pid ? N_IOVEC_OBJECT_FIELDS : 0) <= m);
if (ucred) {
realuid = ucred->uid;
sprintf(pid, "_PID="PID_FMT, ucred->pid);
IOVEC_SET_STRING(iovec[n++], pid);
sprintf(uid, "_UID="UID_FMT, ucred->uid);
IOVEC_SET_STRING(iovec[n++], uid);
sprintf(gid, "_GID="GID_FMT, ucred->gid);
IOVEC_SET_STRING(iovec[n++], gid);
r = get_process_comm(ucred->pid, &t);
if (r >= 0) {
x = strjoina("_COMM=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
r = get_process_exe(ucred->pid, &t);
if (r >= 0) {
x = strjoina("_EXE=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
r = get_process_cmdline(ucred->pid, 0, false, &t);
if (r >= 0) {
x = strjoina("_CMDLINE=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
r = get_process_capeff(ucred->pid, &t);
if (r >= 0) {
x = strjoina("_CAP_EFFECTIVE=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
#ifdef HAVE_AUDIT
r = audit_session_from_pid(ucred->pid, &audit);
if (r >= 0) {
sprintf(audit_session, "_AUDIT_SESSION=%"PRIu32, audit);
IOVEC_SET_STRING(iovec[n++], audit_session);
}
r = audit_loginuid_from_pid(ucred->pid, &loginuid);
if (r >= 0) {
sprintf(audit_loginuid, "_AUDIT_LOGINUID="UID_FMT, loginuid);
IOVEC_SET_STRING(iovec[n++], audit_loginuid);
}
#endif
r = cg_pid_get_path_shifted(ucred->pid, s->cgroup_root, &c);
if (r >= 0) {
char *session = NULL;
x = strjoina("_SYSTEMD_CGROUP=", c);
IOVEC_SET_STRING(iovec[n++], x);
r = cg_path_get_session(c, &t);
if (r >= 0) {
session = strjoina("_SYSTEMD_SESSION=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], session);
}
if (cg_path_get_owner_uid(c, &owner) >= 0) {
owner_valid = true;
sprintf(owner_uid, "_SYSTEMD_OWNER_UID="UID_FMT, owner);
IOVEC_SET_STRING(iovec[n++], owner_uid);
}
if (cg_path_get_unit(c, &t) >= 0) {
x = strjoina("_SYSTEMD_UNIT=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
} else if (unit_id && !session) {
x = strjoina("_SYSTEMD_UNIT=", unit_id);
IOVEC_SET_STRING(iovec[n++], x);
}
if (cg_path_get_user_unit(c, &t) >= 0) {
x = strjoina("_SYSTEMD_USER_UNIT=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
} else if (unit_id && session) {
x = strjoina("_SYSTEMD_USER_UNIT=", unit_id);
IOVEC_SET_STRING(iovec[n++], x);
}
if (cg_path_get_slice(c, &t) >= 0) {
x = strjoina("_SYSTEMD_SLICE=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
free(c);
} else if (unit_id) {
x = strjoina("_SYSTEMD_UNIT=", unit_id);
IOVEC_SET_STRING(iovec[n++], x);
}
#ifdef HAVE_SELINUX
if (mac_selinux_use()) {
if (label) {
x = alloca(strlen("_SELINUX_CONTEXT=") + label_len + 1);
*((char*) mempcpy(stpcpy(x, "_SELINUX_CONTEXT="), label, label_len)) = 0;
IOVEC_SET_STRING(iovec[n++], x);
} else {
security_context_t con;
if (getpidcon(ucred->pid, &con) >= 0) {
x = strjoina("_SELINUX_CONTEXT=", con);
freecon(con);
IOVEC_SET_STRING(iovec[n++], x);
}
}
}
#endif
}
assert(n <= m);
if (object_pid) {
r = get_process_uid(object_pid, &object_uid);
if (r >= 0) {
sprintf(o_uid, "OBJECT_UID="UID_FMT, object_uid);
IOVEC_SET_STRING(iovec[n++], o_uid);
}
r = get_process_gid(object_pid, &object_gid);
if (r >= 0) {
sprintf(o_gid, "OBJECT_GID="GID_FMT, object_gid);
IOVEC_SET_STRING(iovec[n++], o_gid);
}
r = get_process_comm(object_pid, &t);
if (r >= 0) {
x = strjoina("OBJECT_COMM=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
r = get_process_exe(object_pid, &t);
if (r >= 0) {
x = strjoina("OBJECT_EXE=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
r = get_process_cmdline(object_pid, 0, false, &t);
if (r >= 0) {
x = strjoina("OBJECT_CMDLINE=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
#ifdef HAVE_AUDIT
r = audit_session_from_pid(object_pid, &audit);
if (r >= 0) {
sprintf(o_audit_session, "OBJECT_AUDIT_SESSION=%"PRIu32, audit);
IOVEC_SET_STRING(iovec[n++], o_audit_session);
}
r = audit_loginuid_from_pid(object_pid, &loginuid);
if (r >= 0) {
sprintf(o_audit_loginuid, "OBJECT_AUDIT_LOGINUID="UID_FMT, loginuid);
IOVEC_SET_STRING(iovec[n++], o_audit_loginuid);
}
#endif
r = cg_pid_get_path_shifted(object_pid, s->cgroup_root, &c);
if (r >= 0) {
x = strjoina("OBJECT_SYSTEMD_CGROUP=", c);
IOVEC_SET_STRING(iovec[n++], x);
r = cg_path_get_session(c, &t);
if (r >= 0) {
x = strjoina("OBJECT_SYSTEMD_SESSION=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
if (cg_path_get_owner_uid(c, &owner) >= 0) {
sprintf(o_owner_uid, "OBJECT_SYSTEMD_OWNER_UID="UID_FMT, owner);
IOVEC_SET_STRING(iovec[n++], o_owner_uid);
}
if (cg_path_get_unit(c, &t) >= 0) {
x = strjoina("OBJECT_SYSTEMD_UNIT=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
if (cg_path_get_user_unit(c, &t) >= 0) {
x = strjoina("OBJECT_SYSTEMD_USER_UNIT=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
free(c);
}
}
assert(n <= m);
if (tv) {
sprintf(source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu", (unsigned long long) timeval_load(tv));
IOVEC_SET_STRING(iovec[n++], source_time);
}
/* Note that strictly speaking storing the boot id here is
* redundant since the entry includes this in-line
* anyway. However, we need this indexed, too. */
if (!isempty(s->boot_id_field))
IOVEC_SET_STRING(iovec[n++], s->boot_id_field);
if (!isempty(s->machine_id_field))
IOVEC_SET_STRING(iovec[n++], s->machine_id_field);
if (!isempty(s->hostname_field))
IOVEC_SET_STRING(iovec[n++], s->hostname_field);
assert(n <= m);
if (s->split_mode == SPLIT_UID && realuid > 0)
/* Split up strictly by any UID */
journal_uid = realuid;
else if (s->split_mode == SPLIT_LOGIN && realuid > 0 && owner_valid && owner > 0)
/* Split up by login UIDs. We do this only if the
* realuid is not root, in order not to accidentally
* leak privileged information to the user that is
* logged by a privileged process that is part of an
* unprivileged session. */
journal_uid = owner;
else
journal_uid = 0;
write_to_journal(s, journal_uid, iovec, n, priority);
}
void server_driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
char mid[11 + 32 + 1];
char buffer[16 + LINE_MAX + 1];
struct iovec iovec[N_IOVEC_META_FIELDS + 6];
int n = 0;
va_list ap;
struct ucred ucred = {};
assert(s);
assert(format);
IOVEC_SET_STRING(iovec[n++], "SYSLOG_FACILITY=3");
IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=systemd-journald");
IOVEC_SET_STRING(iovec[n++], "PRIORITY=6");
IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
memcpy(buffer, "MESSAGE=", 8);
va_start(ap, format);
vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
va_end(ap);
IOVEC_SET_STRING(iovec[n++], buffer);
if (!sd_id128_equal(message_id, SD_ID128_NULL)) {
snprintf(mid, sizeof(mid), LOG_MESSAGE_ID(message_id));
IOVEC_SET_STRING(iovec[n++], mid);
}
ucred.pid = getpid();
ucred.uid = getuid();
ucred.gid = getgid();
dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0, NULL, LOG_INFO, 0);
}
void server_dispatch_message(
Server *s,
struct iovec *iovec, unsigned n, unsigned m,
const struct ucred *ucred,
const struct timeval *tv,
const char *label, size_t label_len,
const char *unit_id,
int priority,
pid_t object_pid) {
int rl, r;
_cleanup_free_ char *path = NULL;
uint64_t available = 0;
char *c;
assert(s);
assert(iovec || n == 0);
if (n == 0)
return;
if (LOG_PRI(priority) > s->max_level_store)
return;
/* Stop early in case the information will not be stored
* in a journal. */
if (s->storage == STORAGE_NONE)
return;
if (!ucred)
goto finish;
r = cg_pid_get_path_shifted(ucred->pid, s->cgroup_root, &path);
if (r < 0)
goto finish;
/* example: /user/lennart/3/foobar
* /system/dbus.service/foobar
*
* So let's cut of everything past the third /, since that is
* where user directories start */
c = strchr(path, '/');
if (c) {
c = strchr(c+1, '/');
if (c) {
c = strchr(c+1, '/');
if (c)
*c = 0;
}
}
(void) determine_space(s, false, false, &available, NULL);
rl = journal_rate_limit_test(s->rate_limit, path, priority & LOG_PRIMASK, available);
if (rl == 0)
return;
/* Write a suppression message if we suppressed something */
if (rl > 1)
server_driver_message(s, SD_MESSAGE_JOURNAL_DROPPED,
"Suppressed %u messages from %s", rl - 1, path);
finish:
dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len, unit_id, priority, object_pid);
}
static int system_journal_open(Server *s, bool flush_requested) {
const char *fn;
int r = 0;
if (!s->system_journal &&
(s->storage == STORAGE_PERSISTENT || s->storage == STORAGE_AUTO) &&
(flush_requested
|| access("/run/systemd/journal/flushed", F_OK) >= 0)) {
/* If in auto mode: first try to create the machine
* path, but not the prefix.
*
* If in persistent mode: create /var/log/journal and
* the machine path */
if (s->storage == STORAGE_PERSISTENT)
(void) mkdir_p("/var/log/journal/", 0755);
fn = strjoina("/var/log/journal/", SERVER_MACHINE_ID(s));
(void) mkdir(fn, 0755);
fn = strjoina(fn, "/system.journal");
r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, NULL, &s->system_journal);
if (r >= 0) {
server_fix_perms(s, s->system_journal, 0);
(void) determine_space_for(s, &s->system_metrics, "/var/log/journal/", "System journal", true, true, NULL, NULL);
} else if (r < 0) {
if (r != -ENOENT && r != -EROFS)
log_warning_errno(r, "Failed to open system journal: %m");
r = 0;
}
}
if (!s->runtime_journal &&
(s->storage != STORAGE_NONE)) {
fn = strjoina("/run/log/journal/", SERVER_MACHINE_ID(s), "/system.journal");
if (s->system_journal) {
/* Try to open the runtime journal, but only
* if it already exists, so that we can flush
* it into the system journal */
r = journal_file_open(fn, O_RDWR, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
if (r < 0) {
if (r != -ENOENT)
log_warning_errno(r, "Failed to open runtime journal: %m");
r = 0;
}
} else {
/* OK, we really need the runtime journal, so create
* it if necessary. */