#include <sys/signalfd.h>

#include <sys/ioctl.h>

#include <linux/sockios.h>

#include <sys/statvfs.h>

#include <sys/mman.h>

#include <libudev.h>

#include <systemd/sd-journal.h>

#include <systemd/sd-messages.h>

#include <systemd/sd-daemon.h>

#ifdef HAVE_LOGIND

#include <systemd/sd-login.h>

#endif

#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 <sys/acl.h>

#include <acl/libacl.h>

#include "acl-util.h"

#endif

#ifdef HAVE_SELINUX

#include <selinux/selinux.h>

#endif

#define USER_JOURNALS_MAX 1024

#define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)

#define DEFAULT_RATE_LIMIT_BURST 200

#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) {

char ids[33];

char _cleanup_free_ *p = NULL;

const char *f;

sd_id128_t machine;

struct statvfs ss;

uint64_t sum = 0, avail = 0, ss_avail = 0;

int r;

DIR _cleanup_closedir_ *d = NULL;

usec_t ts;

JournalMetrics *m;

ts = now(CLOCK_MONOTONIC);

if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)

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;

}

avail = sum >= m->max_use ? 0 : m->max_use - sum;

ss_avail = ss.f_bsize * ss.f_bavail;

ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;

if (ss_avail < avail)

avail = ss_avail;

s->cached_available_space = avail;

s->cached_available_space_timestamp = ts;

return avail;

}

static void server_read_file_gid(Server *s) {

const char *adm = "adm";

int r;

assert(s);

if (s->file_gid_valid)

return;

r = get_group_creds(&adm, &s->file_gid);

if (r < 0)

log_warning("Failed to resolve 'adm' group: %s", strerror(-r));

/* if we couldn't read the gid, then it will be 0, but that's

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;

}

}

if (acl_get_permset(entry, &permset) < 0 ||

acl_add_perm(permset, ACL_READ) < 0 ||

acl_calc_mask(&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) {

char *p;

int r;

JournalFile *f;

sd_id128_t machine;

assert(s);

/* We split up user logs only on /var, not on /run. If the

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, s->system_journal, &f);

free(p);

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_vacuum(Server *s) {

char *p;

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) {

p = strappend("/var/log/journal/", ids);

if (!p) {

log_oom();

return;

}

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));

free(p);

}

if (s->runtime_journal) {

p = strappend("/run/log/journal/", ids);

if (!p) {

log_oom();

return;

}

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));

free(p);

}

s->cached_available_space_timestamp = 0;

}

static char *shortened_cgroup_path(pid_t pid) {

int r;

char _cleanup_free_ *process_path = NULL, *init_path = NULL;

char *path;

assert(pid > 0);

r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);

if (r < 0)

return NULL;

r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);

if (r < 0)

return NULL;

if (endswith(init_path, "/system"))

init_path[strlen(init_path) - 7] = 0;

else if (streq(init_path, "/"))

init_path[0] = 0;

if (startswith(process_path, init_path)) {

path = strdup(process_path + strlen(init_path));

} else {

path = process_path;

process_path = NULL;

}

return path;

}

bool shall_try_append_again(JournalFile *f, int r) {

/* -E2BIG Hit configured limit

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) {

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)

return;

if (vacuumed || !shall_try_append_again(f, r)) {

log_error("Failed to write entry, ignoring: %s", 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)

log_error("Failed to write entry, ignoring: %s", strerror(-r));

}

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) {

char _cleanup_free_ *pid = NULL, *uid = NULL, *gid = NULL,

*source_time = NULL, *boot_id = NULL, *machine_id = NULL,

*comm = NULL, *cmdline = NULL, *hostname = NULL,

*audit_session = NULL, *audit_loginuid = NULL,

*exe = NULL, *cgroup = NULL, *session = NULL,

*owner_uid = NULL, *unit = NULL, *selinux_context = NULL;

char idbuf[33];

sd_id128_t id;

int r;

char *t;

uid_t loginuid = 0, realuid = 0, owner = 0, journal_uid;

bool loginuid_valid = false, owner_valid = false;

assert(s);

assert(iovec);

assert(n > 0);

assert(n + N_IOVEC_META_FIELDS <= m);

if (ucred) {

uint32_t audit;

realuid = ucred->uid;

if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)

IOVEC_SET_STRING(iovec[n++], pid);

if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)

IOVEC_SET_STRING(iovec[n++], uid);

if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)

IOVEC_SET_STRING(iovec[n++], gid);

r = get_process_comm(ucred->pid, &t);

if (r >= 0) {

comm = strappend("_COMM=", t);

free(t);

if (comm)

IOVEC_SET_STRING(iovec[n++], comm);

}

r = get_process_exe(ucred->pid, &t);

if (r >= 0) {

exe = strappend("_EXE=", t);

free(t);

if (exe)

IOVEC_SET_STRING(iovec[n++], exe);

}

r = get_process_cmdline(ucred->pid, 0, false, &t);

if (r >= 0) {

cmdline = strappend("_CMDLINE=", t);

free(t);

if (cmdline)

IOVEC_SET_STRING(iovec[n++], cmdline);

}

r = audit_session_from_pid(ucred->pid, &audit);

if (r >= 0)

if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0)

IOVEC_SET_STRING(iovec[n++], audit_session);

r = audit_loginuid_from_pid(ucred->pid, &loginuid);

if (r >= 0) {

loginuid_valid = true;

if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)

IOVEC_SET_STRING(iovec[n++], audit_loginuid);

}

t = shortened_cgroup_path(ucred->pid);

if (t) {

cgroup = strappend("_SYSTEMD_CGROUP=", t);

free(t);

if (cgroup)

IOVEC_SET_STRING(iovec[n++], cgroup);

}

#ifdef HAVE_LOGIND

if (sd_pid_get_session(ucred->pid, &t) >= 0) {

session = strappend("_SYSTEMD_SESSION=", t);

free(t);

if (session)

IOVEC_SET_STRING(iovec[n++], session);

}

if (sd_pid_get_owner_uid(ucred->uid, &owner) >= 0) {

owner_valid = true;

if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0)

IOVEC_SET_STRING(iovec[n++], owner_uid);

}

#endif

if (cg_pid_get_unit(ucred->pid, &t) >= 0) {

unit = strappend("_SYSTEMD_UNIT=", t);

free(t);

} else if (cg_pid_get_user_unit(ucred->pid, &t) >= 0) {

unit = strappend("_SYSTEMD_USER_UNIT=", t);

free(t);

} else if (unit_id) {

if (session)

unit = strappend("_SYSTEMD_USER_UNIT=", unit_id);

else

unit = strappend("_SYSTEMD_UNIT=", unit_id);

}

if (unit)

IOVEC_SET_STRING(iovec[n++], unit);

#ifdef HAVE_SELINUX

if (label) {

selinux_context = malloc(sizeof("_SELINUX_CONTEXT=") + label_len);

if (selinux_context) {

memcpy(selinux_context, "_SELINUX_CONTEXT=", sizeof("_SELINUX_CONTEXT=")-1);

memcpy(selinux_context+sizeof("_SELINUX_CONTEXT=")-1, label, label_len);

selinux_context[sizeof("_SELINUX_CONTEXT=")-1+label_len] = 0;

IOVEC_SET_STRING(iovec[n++], selinux_context);

}

} else {

security_context_t con;

if (getpidcon(ucred->pid, &con) >= 0) {

selinux_context = strappend("_SELINUX_CONTEXT=", con);

if (selinux_context)

IOVEC_SET_STRING(iovec[n++], selinux_context);

freecon(con);

}

}

#endif

}

if (tv) {

if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",

(unsigned long long) timeval_load(tv)) >= 0)

IOVEC_SET_STRING(iovec[n++], source_time);

}

/* Note that strictly speaking storing the boot id here is

r = sd_id128_get_boot(&id);

if (r >= 0)

if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)

IOVEC_SET_STRING(iovec[n++], boot_id);

r = sd_id128_get_machine(&id);

if (r >= 0)

if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)

IOVEC_SET_STRING(iovec[n++], machine_id);

t = gethostname_malloc();

if (t) {

hostname = strappend("_HOSTNAME=", t);

free(t);

if (hostname)

IOVEC_SET_STRING(iovec[n++], hostname);

}

assert(n <= m);

if (s->split_mode == SPLIT_UID && realuid > 0)

journal_uid = realuid;

else if (s->split_mode == SPLIT_LOGIN && owner_valid && owner > 0)

journal_uid = owner;

else if (s->split_mode == SPLIT_LOGIN && loginuid_valid && loginuid > 0)

journal_uid = loginuid;

else

journal_uid = 0;

write_to_journal(s, journal_uid, iovec, n);

}

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);

}

zero(ucred);

ucred.pid = getpid();

ucred.uid = getuid();

ucred.gid = getgid();

dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0, NULL);

}

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) {

int rl;

char _cleanup_free_ *path = NULL;

char *c;

assert(s);

assert(iovec || n == 0);

if (n == 0)

return;

if (LOG_PRI(priority) > s->max_level_store)

return;

if (!ucred)

goto finish;

path = shortened_cgroup_path(ucred->pid);

if (!path)

goto finish;

/* example: /user/lennart/3/foobar

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));

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);

}

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

if (s->storage == STORAGE_PERSISTENT)

(void) mkdir("/var/log/journal/", 0755);

fn = strappend("/var/log/journal/", ids);

if (!fn)

return -ENOMEM;

(void) mkdir(fn, 0755);

free(fn);

fn = strjoin("/var/log/journal/", ids, "/system.journal", NULL);

if (!fn)

return -ENOMEM;

r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, NULL, &s->system_journal);

free(fn);

if (r >= 0) {

char fb[FORMAT_BYTES_MAX];

server_fix_perms(s, s->system_journal, 0);

server_driver_message(s, SD_ID128_NULL, "Allowing system journal files to grow to %s.",

format_bytes(fb, sizeof(fb), s->system_metrics.max_use));

} 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

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

(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) {

char fb[FORMAT_BYTES_MAX];

server_fix_perms(s, s->runtime_journal, 0);

server_driver_message(s, SD_ID128_NULL, "Allowing runtime journal files to grow to %s.",

format_bytes(fb, sizeof(fb), s->runtime_metrics.max_use));

}

}

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);

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);

if (j)

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;

}

log_info("Received SIG%s", signal_to_string(sfsi.ssi_signo));

if (sfsi.ssi_signo == SIGUSR1) {

touch("/run/systemd/journal/flushed");

server_flush_to_var(s);

return 1;

}

if (sfsi.ssi_signo == SIGUSR2) {

server_rotate(s);

server_vacuum(s);

return 1;

}

return 0;

} 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

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) {

e = memchr(s->buffer, '\n', n);

if (e)

*e = 0;

else

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

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) {

char _cleanup_free_ *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) {

char _cleanup_free_ *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";

FILE _cleanup_fclose_ *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(fn, f, "Journal\0", config_item_perf_lookup,

(void*) journald_gperf_lookup, false, s);

if (r < 0)

log_warning("Failed to parse configuration file: %s", strerror(-r));

return r;

}

int server_init(Server *s) {

int n, r, fd;

assert(s);

zero(*s);

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->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 = 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->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);

}