/*-*- 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
#include
#include
#include
#include "fileio.h"
#include "mkdir.h"
#include "hashmap.h"
#include "journal-file.h"
#include "socket-util.h"
#include "cgroup-util.h"
#include "list.h"
#include "virt.h"
#include "missing.h"
#include "conf-parser.h"
#include "journal-internal.h"
#include "journal-vacuum.h"
#include "journal-authenticate.h"
#include "journald-server.h"
#include "journald-rate-limit.h"
#include "journald-kmsg.h"
#include "journald-syslog.h"
#include "journald-stream.h"
#include "journald-console.h"
#include "journald-native.h"
#ifdef HAVE_ACL
#include
#include
#include "acl-util.h"
#endif
#ifdef HAVE_SELINUX
#include
#endif
#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 RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)
static const char* const storage_table[] = {
[STORAGE_AUTO] = "auto",
[STORAGE_VOLATILE] = "volatile",
[STORAGE_PERSISTENT] = "persistent",
[STORAGE_NONE] = "none"
};
DEFINE_STRING_TABLE_LOOKUP(storage, Storage);
DEFINE_CONFIG_PARSE_ENUM(config_parse_storage, storage, Storage, "Failed to parse storage setting");
static const char* const split_mode_table[] = {
[SPLIT_NONE] = "none",
[SPLIT_UID] = "uid",
[SPLIT_LOGIN] = "login"
};
DEFINE_STRING_TABLE_LOOKUP(split_mode, SplitMode);
DEFINE_CONFIG_PARSE_ENUM(config_parse_split_mode, split_mode, SplitMode, "Failed to parse split mode setting");
static uint64_t available_space(Server *s, bool verbose) {
char ids[33];
_cleanup_free_ char *p = NULL;
sd_id128_t machine;
struct statvfs ss;
uint64_t sum = 0, ss_avail = 0, avail = 0;
int r;
_cleanup_closedir_ DIR *d = NULL;
usec_t ts;
const char *f;
JournalMetrics *m;
ts = now(CLOCK_MONOTONIC);
if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts
&& !verbose)
return s->cached_available_space;
r = sd_id128_get_machine(&machine);
if (r < 0)
return 0;
if (s->system_journal) {
f = "/var/log/journal/";
m = &s->system_metrics;
} else {
f = "/run/log/journal/";
m = &s->runtime_metrics;
}
assert(m);
p = strappend(f, sd_id128_to_string(machine, ids));
if (!p)
return 0;
d = opendir(p);
if (!d)
return 0;
if (fstatvfs(dirfd(d), &ss) < 0)
return 0;
for (;;) {
struct stat st;
struct dirent *de;
union dirent_storage buf;
r = readdir_r(d, &buf.de, &de);
if (r != 0)
break;
if (!de)
break;
if (!endswith(de->d_name, ".journal") &&
!endswith(de->d_name, ".journal~"))
continue;
if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
continue;
if (!S_ISREG(st.st_mode))
continue;
sum += (uint64_t) st.st_blocks * 512UL;
}
ss_avail = ss.f_bsize * ss.f_bavail;
avail = ss_avail > m->keep_free ? ss_avail - m->keep_free : 0;
s->cached_available_space = MIN(m->max_use, avail) > sum ? MIN(m->max_use, avail) - sum : 0;
s->cached_available_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];
server_driver_message(s, SD_MESSAGE_JOURNAL_USAGE,
"%s journal is using %s (max %s, leaving %s of free %s, current limit %s).",
s->system_journal ? "Permanent" : "Runtime",
format_bytes(fb1, sizeof(fb1), sum),
format_bytes(fb2, sizeof(fb2), m->max_use),
format_bytes(fb3, sizeof(fb3), m->keep_free),
format_bytes(fb4, sizeof(fb4), ss_avail),
format_bytes(fb5, sizeof(fb5), MIN(m->max_use, avail)));
}
return s->cached_available_space;
}
static void server_read_file_gid(Server *s) {
const char *g = "systemd-journal";
int r;
assert(s);
if (s->file_gid_valid)
return;
r = get_group_creds(&g, &s->file_gid);
if (r < 0)
log_warning("Failed to resolve '%s' group: %s", g, strerror(-r));
/* if we couldn't read the gid, then it will be 0, but that's
* fine and we shouldn't try to resolve the group again, so
* let's just pretend it worked right-away. */
s->file_gid_valid = true;
}
void server_fix_perms(Server *s, JournalFile *f, uid_t uid) {
int r;
#ifdef HAVE_ACL
acl_t acl;
acl_entry_t entry;
acl_permset_t permset;
#endif
assert(f);
server_read_file_gid(s);
r = fchmod_and_fchown(f->fd, 0640, 0, s->file_gid);
if (r < 0)
log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
#ifdef HAVE_ACL
if (uid <= 0)
return;
acl = acl_get_fd(f->fd);
if (!acl) {
log_warning("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("Failed to patch ACL on %s, ignoring: %m", f->path);
goto finish;
}
}
/* 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("Failed to patch ACL on %s, ignoring: %m", f->path);
goto finish;
}
if (acl_set_fd(f->fd, acl) < 0)
log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
finish:
acl_free(acl);
#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 <= 0)
return s->system_journal;
r = sd_id128_get_machine(&machine);
if (r < 0)
return s->system_journal;
f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
if (f)
return f;
if (asprintf(&p, "/var/log/journal/" SD_ID128_FORMAT_STR "/user-%lu.journal",
SD_ID128_FORMAT_VAL(machine), (unsigned long) uid) < 0)
return s->system_journal;
while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
/* Too many open? Then let's close one */
f = 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 = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
if (r < 0) {
journal_file_close(f);
return s->system_journal;
}
return f;
}
void server_rotate(Server *s) {
JournalFile *f;
void *k;
Iterator i;
int r;
log_debug("Rotating...");
if (s->runtime_journal) {
r = journal_file_rotate(&s->runtime_journal, s->compress, false);
if (r < 0)
if (s->runtime_journal)
log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
else
log_error("Failed to create new runtime journal: %s", strerror(-r));
else
server_fix_perms(s, s->runtime_journal, 0);
}
if (s->system_journal) {
r = journal_file_rotate(&s->system_journal, s->compress, s->seal);
if (r < 0)
if (s->system_journal)
log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
else
log_error("Failed to create new system journal: %s", strerror(-r));
else
server_fix_perms(s, s->system_journal, 0);
}
HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
r = journal_file_rotate(&f, s->compress, s->seal);
if (r < 0)
if (f)
log_error("Failed to rotate %s: %s", f->path, strerror(-r));
else
log_error("Failed to create user journal: %s", strerror(-r));
else {
hashmap_replace(s->user_journals, k, f);
server_fix_perms(s, f, PTR_TO_UINT32(k));
}
}
}
void server_sync(Server *s) {
static const struct itimerspec sync_timer_disable = {};
JournalFile *f;
void *k;
Iterator i;
int r;
if (s->system_journal) {
r = journal_file_set_offline(s->system_journal);
if (r < 0)
log_error("Failed to sync system journal: %s", strerror(-r));
}
HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
r = journal_file_set_offline(f);
if (r < 0)
log_error("Failed to sync user journal: %s", strerror(-r));
}
r = timerfd_settime(s->sync_timer_fd, 0, &sync_timer_disable, NULL);
if (r < 0)
log_error("Failed to disable max timer: %m");
s->sync_scheduled = false;
}
void server_vacuum(Server *s) {
char ids[33];
sd_id128_t machine;
int r;
log_debug("Vacuuming...");
s->oldest_file_usec = 0;
r = sd_id128_get_machine(&machine);
if (r < 0) {
log_error("Failed to get machine ID: %s", strerror(-r));
return;
}
sd_id128_to_string(machine, ids);
if (s->system_journal) {
char *p = strappenda("/var/log/journal/", ids);
r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free, s->max_retention_usec, &s->oldest_file_usec);
if (r < 0 && r != -ENOENT)
log_error("Failed to vacuum %s: %s", p, strerror(-r));
}
if (s->runtime_journal) {
char *p = strappenda("/run/log/journal/", ids);
r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free, s->max_retention_usec, &s->oldest_file_usec);
if (r < 0 && r != -ENOENT)
log_error("Failed to vacuum %s: %s", p, strerror(-r));
}
s->cached_available_space_timestamp = 0;
}
bool shall_try_append_again(JournalFile *f, int r) {
/* -E2BIG Hit configured limit
-EFBIG Hit fs limit
-EDQUOT Quota limit hit
-ENOSPC Disk full
-EHOSTDOWN Other machine
-EBUSY Unclean shutdown
-EPROTONOSUPPORT Unsupported feature
-EBADMSG Corrupted
-ENODATA Truncated
-ESHUTDOWN Already archived */
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
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);
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)) {
size_t size = 0;
unsigned i;
for (i = 0; i < n; i++)
size += iovec[i].iov_len;
log_error("Failed to write entry (%d items, %zu bytes), ignoring: %s", n, size, strerror(-r));
return;
}
server_rotate(s);
server_vacuum(s);
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) {
size_t size = 0;
unsigned i;
for (i = 0; i < n; i++)
size += iovec[i].iov_len;
log_error("Failed to write entry (%d items, %zu bytes) despite vacuuming, ignoring: %s", n, size, strerror(-r));
} else
server_schedule_sync(s, priority);
}
static void dispatch_message_real(
Server *s,
struct iovec *iovec, unsigned n, unsigned m,
struct ucred *ucred,
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)],
boot_id[sizeof("_BOOT_ID=") + 32] = "_BOOT_ID=",
machine_id[sizeof("_MACHINE_ID=") + 32] = "_MACHINE_ID=",
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;
sd_id128_t id;
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=%lu", (unsigned long) ucred->pid);
IOVEC_SET_STRING(iovec[n++], pid);
sprintf(uid, "_UID=%lu", (unsigned long) ucred->uid);
IOVEC_SET_STRING(iovec[n++], uid);
sprintf(gid, "_GID=%lu", (unsigned long) ucred->gid);
IOVEC_SET_STRING(iovec[n++], gid);
r = get_process_comm(ucred->pid, &t);
if (r >= 0) {
x = strappenda("_COMM=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
r = get_process_exe(ucred->pid, &t);
if (r >= 0) {
x = strappenda("_EXE=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
r = get_process_cmdline(ucred->pid, 0, false, &t);
if (r >= 0) {
x = strappenda("_CMDLINE=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
r = get_process_capeff(ucred->pid, &t);
if (r >= 0) {
x = strappenda("_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=%lu", (unsigned long) audit);
IOVEC_SET_STRING(iovec[n++], audit_session);
}
r = audit_loginuid_from_pid(ucred->pid, &loginuid);
if (r >= 0) {
sprintf(audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid);
IOVEC_SET_STRING(iovec[n++], audit_loginuid);
}
#endif
r = cg_pid_get_path_shifted(ucred->pid, NULL, &c);
if (r >= 0) {
char *session = NULL;
x = strappenda("_SYSTEMD_CGROUP=", c);
IOVEC_SET_STRING(iovec[n++], x);
r = cg_path_get_session(c, &t);
if (r >= 0) {
session = strappenda("_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=%lu", (unsigned long) owner);
IOVEC_SET_STRING(iovec[n++], owner_uid);
}
if (cg_path_get_unit(c, &t) >= 0) {
x = strappenda("_SYSTEMD_UNIT=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
} else if (unit_id && !session) {
x = strappenda("_SYSTEMD_UNIT=", unit_id);
IOVEC_SET_STRING(iovec[n++], x);
}
if (cg_path_get_user_unit(c, &t) >= 0) {
x = strappenda("_SYSTEMD_USER_UNIT=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
} else if (unit_id && session) {
x = strappenda("_SYSTEMD_USER_UNIT=", unit_id);
IOVEC_SET_STRING(iovec[n++], x);
}
free(c);
}
#ifdef HAVE_SELINUX
if (label) {
x = alloca(sizeof("_SELINUX_CONTEXT=") + label_len);
*((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 = strappenda("_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=%lu", (unsigned long) 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=%lu", (unsigned long) object_gid);
IOVEC_SET_STRING(iovec[n++], o_gid);
}
r = get_process_comm(object_pid, &t);
if (r >= 0) {
x = strappenda("OBJECT_COMM=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
r = get_process_exe(object_pid, &t);
if (r >= 0) {
x = strappenda("OBJECT_EXE=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
r = get_process_cmdline(object_pid, 0, false, &t);
if (r >= 0) {
x = strappenda("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=%lu", (unsigned long) 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=%lu", (unsigned long) loginuid);
IOVEC_SET_STRING(iovec[n++], o_audit_loginuid);
}
#endif
r = cg_pid_get_path_shifted(object_pid, NULL, &c);
if (r >= 0) {
x = strappenda("OBJECT_SYSTEMD_CGROUP=", c);
IOVEC_SET_STRING(iovec[n++], x);
r = cg_path_get_session(c, &t);
if (r >= 0) {
x = strappenda("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=%lu", (unsigned long) owner);
IOVEC_SET_STRING(iovec[n++], o_owner_uid);
}
if (cg_path_get_unit(c, &t) >= 0) {
x = strappenda("OBJECT_SYSTEMD_UNIT=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
if (cg_path_get_user_unit(c, &t) >= 0) {
x = strappenda("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. */
r = sd_id128_get_boot(&id);
if (r >= 0) {
sd_id128_to_string(id, boot_id + strlen("_BOOT_ID="));
IOVEC_SET_STRING(iovec[n++], boot_id);
}
r = sd_id128_get_machine(&id);
if (r >= 0) {
sd_id128_to_string(id, machine_id + strlen("_MACHINE_ID="));
IOVEC_SET_STRING(iovec[n++], machine_id);
}
t = gethostname_malloc();
if (t) {
x = strappenda("_HOSTNAME=", t);
free(t);
IOVEC_SET_STRING(iovec[n++], x);
}
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, this avoids creation of
* individual journals for system 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 + 4];
int n = 0;
va_list ap;
struct ucred ucred = {};
assert(s);
assert(format);
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);
char_array_0(buffer);
IOVEC_SET_STRING(iovec[n++], buffer);
if (!sd_id128_equal(message_id, SD_ID128_NULL)) {
snprintf(mid, sizeof(mid), MESSAGE_ID(message_id));
char_array_0(mid);
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,
struct ucred *ucred,
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;
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, NULL, &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;
}
}
rl = journal_rate_limit_test(s->rate_limit, path,
priority & LOG_PRIMASK, available_space(s, false));
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) {
int r;
char *fn;
sd_id128_t machine;
char ids[33];
r = sd_id128_get_machine(&machine);
if (r < 0)
return r;
sd_id128_to_string(machine, ids);
if (!s->system_journal &&
(s->storage == STORAGE_PERSISTENT || s->storage == STORAGE_AUTO) &&
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("/var/log/journal/", 0755);
fn = strappenda("/var/log/journal/", ids);
(void) mkdir(fn, 0755);
fn = strappenda(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);
else if (r < 0) {
if (r != -ENOENT && r != -EROFS)
log_warning("Failed to open system journal: %s", strerror(-r));
r = 0;
}
}
if (!s->runtime_journal &&
(s->storage != STORAGE_NONE)) {
fn = strjoin("/run/log/journal/", ids, "/system.journal", NULL);
if (!fn)
return -ENOMEM;
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);
free(fn);
if (r < 0) {
if (r != -ENOENT)
log_warning("Failed to open runtime journal: %s", strerror(-r));
r = 0;
}
} else {
/* OK, we really need the runtime journal, so create
* it if necessary. */
(void) mkdir_parents(fn, 0755);
r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
free(fn);
if (r < 0) {
log_error("Failed to open runtime journal: %s", strerror(-r));
return r;
}
}
if (s->runtime_journal)
server_fix_perms(s, s->runtime_journal, 0);
}
available_space(s, true);
return r;
}
int server_flush_to_var(Server *s) {
int r;
sd_id128_t machine;
sd_journal *j = NULL;
assert(s);
if (s->storage != STORAGE_AUTO &&
s->storage != STORAGE_PERSISTENT)
return 0;
if (!s->runtime_journal)
return 0;
system_journal_open(s);
if (!s->system_journal)
return 0;
log_debug("Flushing to /var...");
r = sd_id128_get_machine(&machine);
if (r < 0) {
log_error("Failed to get machine id: %s", strerror(-r));
return r;
}
r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
if (r < 0) {
log_error("Failed to read runtime journal: %s", strerror(-r));
return r;
}
sd_journal_set_data_threshold(j, 0);
SD_JOURNAL_FOREACH(j) {
Object *o = NULL;
JournalFile *f;
f = j->current_file;
assert(f && f->current_offset > 0);
r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
if (r < 0) {
log_error("Can't read entry: %s", strerror(-r));
goto finish;
}
r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
if (r >= 0)
continue;
if (!shall_try_append_again(s->system_journal, r)) {
log_error("Can't write entry: %s", strerror(-r));
goto finish;
}
server_rotate(s);
server_vacuum(s);
if (!s->system_journal) {
log_notice("Didn't flush runtime journal since rotation of system journal wasn't successful.");
r = -EIO;
goto finish;
}
log_debug("Retrying write.");
r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
if (r < 0) {
log_error("Can't write entry: %s", strerror(-r));
goto finish;
}
}
finish:
journal_file_post_change(s->system_journal);
journal_file_close(s->runtime_journal);
s->runtime_journal = NULL;
if (r >= 0)
rm_rf("/run/log/journal", false, true, false);
sd_journal_close(j);
return r;
}
int process_event(Server *s, struct epoll_event *ev) {
assert(s);
assert(ev);
if (ev->data.fd == s->signal_fd) {
struct signalfd_siginfo sfsi;
ssize_t n;
if (ev->events != EPOLLIN) {
log_error("Got invalid event from epoll.");
return -EIO;
}
n = read(s->signal_fd, &sfsi, sizeof(sfsi));
if (n != sizeof(sfsi)) {
if (n >= 0)
return -EIO;
if (errno == EINTR || errno == EAGAIN)
return 1;
return -errno;
}
if (sfsi.ssi_signo == SIGUSR1) {
touch("/run/systemd/journal/flushed");
server_flush_to_var(s);
server_sync(s);
return 1;
}
if (sfsi.ssi_signo == SIGUSR2) {
server_rotate(s);
server_vacuum(s);
return 1;
}
log_info("Received SIG%s", signal_to_string(sfsi.ssi_signo));
return 0;
} else if (ev->data.fd == s->sync_timer_fd) {
int r;
uint64_t t;
log_debug("Got sync request from epoll.");
r = read(ev->data.fd, (void *)&t, sizeof(t));
if (r < 0)
return 0;
server_sync(s);
return 1;
} else if (ev->data.fd == s->dev_kmsg_fd) {
int r;
if (ev->events != EPOLLIN) {
log_error("Got invalid event from epoll.");
return -EIO;
}
r = server_read_dev_kmsg(s);
if (r < 0)
return r;
return 1;
} else if (ev->data.fd == s->native_fd ||
ev->data.fd == s->syslog_fd) {
if (ev->events != EPOLLIN) {
log_error("Got invalid event from epoll.");
return -EIO;
}
for (;;) {
struct msghdr msghdr;
struct iovec iovec;
struct ucred *ucred = NULL;
struct timeval *tv = NULL;
struct cmsghdr *cmsg;
char *label = NULL;
size_t label_len = 0;
union {
struct cmsghdr cmsghdr;
/* We use NAME_MAX space for the
* SELinux label here. The kernel
* currently enforces no limit, but
* according to suggestions from the
* SELinux people this will change and
* it will probably be identical to
* NAME_MAX. For now we use that, but
* this should be updated one day when
* the final limit is known.*/
uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
CMSG_SPACE(sizeof(struct timeval)) +
CMSG_SPACE(sizeof(int)) + /* fd */
CMSG_SPACE(NAME_MAX)]; /* selinux label */
} control;
ssize_t n;
int v;
int *fds = NULL;
unsigned n_fds = 0;
if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
log_error("SIOCINQ failed: %m");
return -errno;
}
if (s->buffer_size < (size_t) v) {
void *b;
size_t l;
l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
b = realloc(s->buffer, l+1);
if (!b) {
log_error("Couldn't increase buffer.");
return -ENOMEM;
}
s->buffer_size = l;
s->buffer = b;
}
zero(iovec);
iovec.iov_base = s->buffer;
iovec.iov_len = s->buffer_size;
zero(control);
zero(msghdr);
msghdr.msg_iov = &iovec;
msghdr.msg_iovlen = 1;
msghdr.msg_control = &control;
msghdr.msg_controllen = sizeof(control);
n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
if (n < 0) {
if (errno == EINTR || errno == EAGAIN)
return 1;
log_error("recvmsg() failed: %m");
return -errno;
}
for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
if (cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_CREDENTIALS &&
cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
ucred = (struct ucred*) CMSG_DATA(cmsg);
else if (cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_SECURITY) {
label = (char*) CMSG_DATA(cmsg);
label_len = cmsg->cmsg_len - CMSG_LEN(0);
} else if (cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SO_TIMESTAMP &&
cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
tv = (struct timeval*) CMSG_DATA(cmsg);
else if (cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_RIGHTS) {
fds = (int*) CMSG_DATA(cmsg);
n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
}
}
if (ev->data.fd == s->syslog_fd) {
char *e;
if (n > 0 && n_fds == 0) {
s->buffer[n] = 0;
server_process_syslog_message(s, strstrip(s->buffer), ucred, tv, label, label_len);
} else if (n_fds > 0)
log_warning("Got file descriptors via syslog socket. Ignoring.");
} else {
if (n > 0 && n_fds == 0)
server_process_native_message(s, s->buffer, n, ucred, tv, label, label_len);
else if (n == 0 && n_fds == 1)
server_process_native_file(s, fds[0], ucred, tv, label, label_len);
else if (n_fds > 0)
log_warning("Got too many file descriptors via native socket. Ignoring.");
}
close_many(fds, n_fds);
}
return 1;
} else if (ev->data.fd == s->stdout_fd) {
if (ev->events != EPOLLIN) {
log_error("Got invalid event from epoll.");
return -EIO;
}
stdout_stream_new(s);
return 1;
} else {
StdoutStream *stream;
if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
log_error("Got invalid event from epoll.");
return -EIO;
}
/* If it is none of the well-known fds, it must be an
* stdout stream fd. Note that this is a bit ugly here
* (since we rely that none of the well-known fds
* could be interpreted as pointer), but nonetheless
* safe, since the well-known fds would never get an
* fd > 4096, i.e. beyond the first memory page */
stream = ev->data.ptr;
if (stdout_stream_process(stream) <= 0)
stdout_stream_free(stream);
return 1;
}
log_error("Unknown event.");
return 0;
}
static int open_signalfd(Server *s) {
sigset_t mask;
struct epoll_event ev;
assert(s);
assert_se(sigemptyset(&mask) == 0);
sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, SIGUSR2, -1);
assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
if (s->signal_fd < 0) {
log_error("signalfd(): %m");
return -errno;
}
zero(ev);
ev.events = EPOLLIN;
ev.data.fd = s->signal_fd;
if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
log_error("epoll_ctl(): %m");
return -errno;
}
return 0;
}
static int server_parse_proc_cmdline(Server *s) {
_cleanup_free_ char *line = NULL;
char *w, *state;
int r;
size_t l;
if (detect_container(NULL) > 0)
return 0;
r = read_one_line_file("/proc/cmdline", &line);
if (r < 0) {
log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
return 0;
}
FOREACH_WORD_QUOTED(w, l, line, state) {
_cleanup_free_ char *word;
word = strndup(w, l);
if (!word)
return -ENOMEM;
if (startswith(word, "systemd.journald.forward_to_syslog=")) {
r = parse_boolean(word + 35);
if (r < 0)
log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
else
s->forward_to_syslog = r;
} else if (startswith(word, "systemd.journald.forward_to_kmsg=")) {
r = parse_boolean(word + 33);
if (r < 0)
log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
else
s->forward_to_kmsg = r;
} else if (startswith(word, "systemd.journald.forward_to_console=")) {
r = parse_boolean(word + 36);
if (r < 0)
log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
else
s->forward_to_console = r;
} else if (startswith(word, "systemd.journald"))
log_warning("Invalid systemd.journald parameter. Ignoring.");
}
return 0;
}
static int server_parse_config_file(Server *s) {
static const char fn[] = "/etc/systemd/journald.conf";
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(s);
f = fopen(fn, "re");
if (!f) {
if (errno == ENOENT)
return 0;
log_warning("Failed to open configuration file %s: %m", fn);
return -errno;
}
r = config_parse(NULL, fn, f, "Journal\0", config_item_perf_lookup,
(void*) journald_gperf_lookup, false, false, s);
if (r < 0)
log_warning("Failed to parse configuration file: %s", strerror(-r));
return r;
}
static int server_open_sync_timer(Server *s) {
int r;
struct epoll_event ev;
assert(s);
s->sync_timer_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
if (s->sync_timer_fd < 0)
return -errno;
zero(ev);
ev.events = EPOLLIN;
ev.data.fd = s->sync_timer_fd;
r = epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->sync_timer_fd, &ev);
if (r < 0) {
log_error("Failed to add idle timer fd to epoll object: %m");
return -errno;
}
return 0;
}
int server_schedule_sync(Server *s, int priority) {
int r;
assert(s);
if (priority <= LOG_CRIT) {
/* Immediately sync to disk when this is of priority CRIT, ALERT, EMERG */
server_sync(s);
return 0;
}
if (s->sync_scheduled)
return 0;
if (s->sync_interval_usec) {
struct itimerspec sync_timer_enable = {};
timespec_store(&sync_timer_enable.it_value, s->sync_interval_usec);
r = timerfd_settime(s->sync_timer_fd, 0, &sync_timer_enable, NULL);
if (r < 0)
return -errno;
}
s->sync_scheduled = true;
return 0;
}
int server_init(Server *s) {
int n, r, fd;
assert(s);
zero(*s);
s->sync_timer_fd = s->syslog_fd = s->native_fd = s->stdout_fd =
s->signal_fd = s->epoll_fd = s->dev_kmsg_fd = -1;
s->compress = true;
s->seal = true;
s->sync_interval_usec = DEFAULT_SYNC_INTERVAL_USEC;
s->sync_scheduled = false;
s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
s->forward_to_syslog = true;
s->max_level_store = LOG_DEBUG;
s->max_level_syslog = LOG_DEBUG;
s->max_level_kmsg = LOG_NOTICE;
s->max_level_console = LOG_INFO;
memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
server_parse_config_file(s);
server_parse_proc_cmdline(s);
if (!!s->rate_limit_interval ^ !!s->rate_limit_burst) {
log_debug("Setting both rate limit interval and burst from %llu,%u to 0,0",
(long long unsigned) s->rate_limit_interval,
s->rate_limit_burst);
s->rate_limit_interval = s->rate_limit_burst = 0;
}
mkdir_p("/run/systemd/journal", 0755);
s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
if (!s->user_journals)
return log_oom();
s->mmap = mmap_cache_new();
if (!s->mmap)
return log_oom();
s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
if (s->epoll_fd < 0) {
log_error("Failed to create epoll object: %m");
return -errno;
}
n = sd_listen_fds(true);
if (n < 0) {
log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
return n;
}
for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
if (s->native_fd >= 0) {
log_error("Too many native sockets passed.");
return -EINVAL;
}
s->native_fd = fd;
} else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
if (s->stdout_fd >= 0) {
log_error("Too many stdout sockets passed.");
return -EINVAL;
}
s->stdout_fd = fd;
} else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
if (s->syslog_fd >= 0) {
log_error("Too many /dev/log sockets passed.");
return -EINVAL;
}
s->syslog_fd = fd;
} else {
log_error("Unknown socket passed.");
return -EINVAL;
}
}
r = server_open_syslog_socket(s);
if (r < 0)
return r;
r = server_open_native_socket(s);
if (r < 0)
return r;
r = server_open_stdout_socket(s);
if (r < 0)
return r;
r = server_open_dev_kmsg(s);
if (r < 0)
return r;
r = server_open_kernel_seqnum(s);
if (r < 0)
return r;
r = server_open_sync_timer(s);
if (r < 0)
return r;
r = open_signalfd(s);
if (r < 0)
return r;
s->udev = udev_new();
if (!s->udev)
return -ENOMEM;
s->rate_limit = journal_rate_limit_new(s->rate_limit_interval,
s->rate_limit_burst);
if (!s->rate_limit)
return -ENOMEM;
r = system_journal_open(s);
if (r < 0)
return r;
return 0;
}
void server_maybe_append_tags(Server *s) {
#ifdef HAVE_GCRYPT
JournalFile *f;
Iterator i;
usec_t n;
n = now(CLOCK_REALTIME);
if (s->system_journal)
journal_file_maybe_append_tag(s->system_journal, n);
HASHMAP_FOREACH(f, s->user_journals, i)
journal_file_maybe_append_tag(f, n);
#endif
}
void server_done(Server *s) {
JournalFile *f;
assert(s);
while (s->stdout_streams)
stdout_stream_free(s->stdout_streams);
if (s->system_journal)
journal_file_close(s->system_journal);
if (s->runtime_journal)
journal_file_close(s->runtime_journal);
while ((f = hashmap_steal_first(s->user_journals)))
journal_file_close(f);
hashmap_free(s->user_journals);
if (s->epoll_fd >= 0)
close_nointr_nofail(s->epoll_fd);
if (s->signal_fd >= 0)
close_nointr_nofail(s->signal_fd);
if (s->syslog_fd >= 0)
close_nointr_nofail(s->syslog_fd);
if (s->native_fd >= 0)
close_nointr_nofail(s->native_fd);
if (s->stdout_fd >= 0)
close_nointr_nofail(s->stdout_fd);
if (s->dev_kmsg_fd >= 0)
close_nointr_nofail(s->dev_kmsg_fd);
if (s->sync_timer_fd >= 0)
close_nointr_nofail(s->sync_timer_fd);
if (s->rate_limit)
journal_rate_limit_free(s->rate_limit);
if (s->kernel_seqnum)
munmap(s->kernel_seqnum, sizeof(uint64_t));
free(s->buffer);
free(s->tty_path);
if (s->mmap)
mmap_cache_unref(s->mmap);
if (s->udev)
udev_unref(s->udev);
}