/*-*- 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 <systemd/sd-journal.h> #include <systemd/sd-messages.h> #include <systemd/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 "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_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) { 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_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) 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) { log_info("Received request to flush runtime journal from PID %"PRIu32, sfsi.ssi_pid); touch("/run/systemd/journal/flushed"); server_flush_to_var(s); server_sync(s); return 1; } if (sfsi.ssi_signo == SIGUSR2) { log_info("Received request to rotate journal from PID %"PRIu32, sfsi.ssi_pid); 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) { 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); }