/*-*- 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/>. ***/ #include <sys/signalfd.h> #include <sys/ioctl.h> #include <linux/sockios.h> #include <sys/statvfs.h> #include <sys/mman.h> #include <sys/timerfd.h> #include <libudev.h> #include "sd-journal.h" #include "sd-messages.h" #include "sd-daemon.h" #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 "missing.h" #include "conf-parser.h" #include "selinux-util.h" #include "journal-internal.h" #include "journal-vacuum.h" #include "journal-authenticate.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" #include "journald-server.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_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_MAX] = { [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_MAX] = { [SPLIT_LOGIN] = "login", [SPLIT_UID] = "uid", [SPLIT_NONE] = "none", }; 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; errno = 0; de = readdir(d); if (!de && errno != 0) return 0; 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; /* If we reached a high mark, we will always allow this much * again, unless usage goes above max_use. This watermark * value is cached so that we don't give up space on pressure, * but hover below the maximum usage. */ if (m->use < sum) m->use = sum; avail = LESS_BY(ss_avail, m->keep_free); s->cached_available_space = LESS_BY(MIN(m->max_use, avail), sum); 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 allowed %s, " "trying to leave %s free of %s available → 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), s->cached_available_space + sum)); } return s->cached_available_space; } 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); r = fchmod(f->fd, 0640); if (r < 0) log_warning("Failed to fix access mode 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 <= SYSTEM_UID_MAX) 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-"UID_FMT".journal", SD_ID128_FORMAT_VAL(machine), 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; } 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("Failed to rotate %s: %s", (*f)->path, strerror(-r)); else log_error("Failed to create new %s journal: %s", name, strerror(-r)); 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..."); do_rotate(s, &s->runtime_journal, "runtime", false, 0); do_rotate(s, &s->system_journal, "system", s->seal, 0); HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) { r = do_rotate(s, &f, "user", s->seal, PTR_TO_UINT32(k)); if (r >= 0) hashmap_replace(s->user_journals, k, f); else if (!f) /* Old file has been closed and deallocated */ 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_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)); } if (s->sync_event_source) { r = sd_event_source_set_enabled(s->sync_event_source, SD_EVENT_OFF); if (r < 0) log_error("Failed to disable sync timer source: %s", strerror(-r)); } s->sync_scheduled = false; } static void do_vacuum(Server *s, char *ids, JournalFile *f, const char* path, JournalMetrics *metrics) { char *p; int r; if (!f) return; p = strappenda(path, ids); r = journal_directory_vacuum(p, metrics->max_use, s->max_retention_usec, &s->oldest_file_usec); if (r < 0 && r != -ENOENT) log_error("Failed to vacuum %s: %s", p, strerror(-r)); } 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); do_vacuum(s, ids, s->system_journal, "/var/log/journal/", &s->system_metrics); do_vacuum(s, ids, s->runtime_journal, "/run/log/journal/", &s->runtime_metrics); s->cached_available_space_timestamp = 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; } 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)], 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 = 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=%"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 = 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="UID_FMT, 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); } if (cg_path_get_slice(c, &t) >= 0) { x = strappenda("_SYSTEMD_SLICE=", t); free(t); IOVEC_SET_STRING(iovec[n++], x); } free(c); } else if (unit_id) { x = strappenda("_SYSTEMD_UNIT=", unit_id); IOVEC_SET_STRING(iovec[n++], x); } #ifdef HAVE_SELINUX if (use_selinux()) { 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 = 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="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 = 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=%"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 = 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="UID_FMT, 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. */ 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, 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, 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; } } 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) { log_error("Failed to get machine id: %s", strerror(-r)); 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("/run/log", 0755); (void) mkdir("/run/log/journal", 0755); (void) mkdir_parents(fn, 0750); 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) { sd_id128_t machine; sd_journal *j = NULL; char ts[FORMAT_TIMESPAN_MAX]; usec_t start; unsigned n = 0; int r; 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..."); start = now(CLOCK_MONOTONIC); r = sd_id128_get_machine(&machine); if (r < 0) 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); n++; 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); server_driver_message(s, SD_ID128_NULL, "Time spent on flushing to /var is %s for %u entries.", format_timespan(ts, sizeof(ts), now(CLOCK_MONOTONIC) - start, 0), n); return r; } int process_datagram(sd_event_source *es, int fd, uint32_t revents, void *userdata) { Server *s = userdata; assert(s); assert(fd == s->native_fd || fd == s->syslog_fd); if (revents != EPOLLIN) { log_error("Got invalid event from epoll for datagram fd: %"PRIx32, revents); return -EIO; } for (;;) { struct ucred *ucred = NULL; struct timeval *tv = NULL; struct cmsghdr *cmsg; char *label = NULL; size_t label_len = 0; struct iovec iovec; 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 = {}; struct msghdr msghdr = { .msg_iov = &iovec, .msg_iovlen = 1, .msg_control = &control, .msg_controllen = sizeof(control), }; ssize_t n; int v; int *fds = NULL; unsigned n_fds = 0; if (ioctl(fd, SIOCINQ, &v) < 0) { log_error("SIOCINQ failed: %m"); return -errno; } if (!GREEDY_REALLOC(s->buffer, s->buffer_size, LINE_MAX + (size_t) v)) return log_oom(); iovec.iov_base = s->buffer; iovec.iov_len = s->buffer_size; n = recvmsg(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); if (n < 0) { if (errno == EINTR || errno == EAGAIN) return 0; 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 (fd == s->syslog_fd) { 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); } } static int dispatch_sigusr1(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) { Server *s = userdata; assert(s); log_info("Received request to flush runtime journal from PID %"PRIu32, si->ssi_pid); touch("/run/systemd/journal/flushed"); server_flush_to_var(s); server_sync(s); return 0; } static int dispatch_sigusr2(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) { Server *s = userdata; assert(s); log_info("Received request to rotate journal from PID %"PRIu32, si->ssi_pid); server_rotate(s); server_vacuum(s); return 0; } static int dispatch_sigterm(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) { Server *s = userdata; assert(s); log_received_signal(LOG_INFO, si); sd_event_exit(s->event, 0); return 0; } static int setup_signals(Server *s) { sigset_t mask; int r; assert(s); assert_se(sigemptyset(&mask) == 0); sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, SIGUSR2, -1); assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); r = sd_event_add_signal(s->event, &s->sigusr1_event_source, SIGUSR1, dispatch_sigusr1, s); if (r < 0) return r; r = sd_event_add_signal(s->event, &s->sigusr2_event_source, SIGUSR2, dispatch_sigusr2, s); if (r < 0) return r; r = sd_event_add_signal(s->event, &s->sigterm_event_source, SIGTERM, dispatch_sigterm, s); if (r < 0) return r; r = sd_event_add_signal(s->event, &s->sigint_event_source, SIGINT, dispatch_sigterm, s); if (r < 0) return r; return 0; } static int server_parse_proc_cmdline(Server *s) { _cleanup_free_ char *line = NULL; char *w, *state; size_t l; int r; r = proc_cmdline(&line); if (r < 0) log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); if (r <= 0) 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.forward_to_wall=")) { r = parse_boolean(word + 33); if (r < 0) log_warning("Failed to parse forward to wall switch %s. Ignoring.", word + 33); else s->forward_to_wall = 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_dispatch_sync(sd_event_source *es, usec_t t, void *userdata) { Server *s = userdata; assert(s); server_sync(s); 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 > 0) { usec_t when; r = sd_event_now(s->event, CLOCK_MONOTONIC, &when); if (r < 0) return r; when += s->sync_interval_usec; if (!s->sync_event_source) { r = sd_event_add_time( s->event, &s->sync_event_source, CLOCK_MONOTONIC, when, 0, server_dispatch_sync, s); if (r < 0) return r; r = sd_event_source_set_priority(s->sync_event_source, SD_EVENT_PRIORITY_IMPORTANT); } else { r = sd_event_source_set_time(s->sync_event_source, when); if (r < 0) return r; r = sd_event_source_set_enabled(s->sync_event_source, SD_EVENT_ONESHOT); } if (r < 0) return r; s->sync_scheduled = true; } return 0; } static int dispatch_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { Server *s = userdata; assert(s); server_cache_hostname(s); return 0; } static int server_open_hostname(Server *s) { int r; assert(s); s->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY); if (s->hostname_fd < 0) { log_error("Failed to open /proc/sys/kernel/hostname: %m"); return -errno; } r = sd_event_add_io(s->event, &s->hostname_event_source, s->hostname_fd, 0, dispatch_hostname_change, s); if (r < 0) { /* kernels prior to 3.2 don't support polling this file. Ignore * the failure. */ if (r == -EPERM) { log_warning("Failed to register hostname fd in event loop: %s. Ignoring.", strerror(-r)); s->hostname_fd = safe_close(s->hostname_fd); return 0; } log_error("Failed to register hostname fd in event loop: %s", strerror(-r)); return r; } r = sd_event_source_set_priority(s->hostname_event_source, SD_EVENT_PRIORITY_IMPORTANT-10); if (r < 0) { log_error("Failed to adjust priority of host name event source: %s", strerror(-r)); return r; } return 0; } int server_init(Server *s) { int n, r, fd; assert(s); zero(*s); s->syslog_fd = s->native_fd = s->stdout_fd = s->dev_kmsg_fd = s->hostname_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->forward_to_wall = 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; s->max_level_wall = LOG_EMERG; 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(); r = sd_event_default(&s->event); if (r < 0) { log_error("Failed to create event loop: %s", strerror(-r)); return r; } sd_event_set_watchdog(s->event, true); 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 || sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/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_hostname(s); if (r < 0) return r; r = setup_signals(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 = cg_get_root_path(&s->cgroup_root); if (r < 0) return r; server_cache_hostname(s); server_cache_boot_id(s); server_cache_machine_id(s); 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); sd_event_source_unref(s->syslog_event_source); sd_event_source_unref(s->native_event_source); sd_event_source_unref(s->stdout_event_source); sd_event_source_unref(s->dev_kmsg_event_source); sd_event_source_unref(s->sync_event_source); sd_event_source_unref(s->sigusr1_event_source); sd_event_source_unref(s->sigusr2_event_source); sd_event_source_unref(s->sigterm_event_source); sd_event_source_unref(s->sigint_event_source); sd_event_source_unref(s->hostname_event_source); sd_event_unref(s->event); safe_close(s->syslog_fd); safe_close(s->native_fd); safe_close(s->stdout_fd); safe_close(s->dev_kmsg_fd); safe_close(s->hostname_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); free(s->cgroup_root); if (s->mmap) mmap_cache_unref(s->mmap); if (s->udev) udev_unref(s->udev); }