/*-*- 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 <fcntl.h> #include <errno.h> #include <stddef.h> #include <string.h> #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <sys/poll.h> #include <time.h> #include <getopt.h> #include <signal.h> #include <sys/stat.h> #include <sys/ioctl.h> #include <linux/fs.h> #include <locale.h> #include <langinfo.h> #include <systemd/sd-journal.h> #include "log.h" #include "util.h" #include "path-util.h" #include "build.h" #include "pager.h" #include "logs-show.h" #include "strv.h" #include "journal-internal.h" #include "journal-def.h" #include "journal-verify.h" #include "journal-authenticate.h" #include "journal-qrcode.h" #include "fsprg.h" #define DEFAULT_FSS_INTERVAL_USEC (15*USEC_PER_MINUTE) static OutputMode arg_output = OUTPUT_SHORT; static bool arg_follow = false; static bool arg_show_all = false; static bool arg_no_pager = false; static unsigned arg_lines = 0; static bool arg_no_tail = false; static bool arg_quiet = false; static bool arg_merge = false; static bool arg_this_boot = false; static const char *arg_cursor = NULL; static const char *arg_directory = NULL; static int arg_priorities = 0xFF; static const char *arg_verify_key = NULL; #ifdef HAVE_GCRYPT static usec_t arg_interval = DEFAULT_FSS_INTERVAL_USEC; #endif static usec_t arg_since, arg_until; static bool arg_since_set = false, arg_until_set = false; static enum { ACTION_SHOW, ACTION_NEW_ID128, ACTION_PRINT_HEADER, ACTION_SETUP_KEYS, ACTION_VERIFY, ACTION_DISK_USAGE, } arg_action = ACTION_SHOW; static int help(void) { printf("%s [OPTIONS...] [MATCH]\n\n" "Send control commands to or query the journal.\n\n" " -h --help Show this help\n" " --version Show package version\n" " --no-pager Do not pipe output into a pager\n" " -a --all Show all fields, including long and unprintable\n" " -c --cursor=CURSOR Start showing entries from specified cursor\n" " --since=DATE Start showing entries newer or of the specified date\n" " --until=DATE Stop showing entries older or of the specified date\n" " -f --follow Follow journal\n" " -n --lines[=INTEGER] Number of journal entries to show\n" " --no-tail Show all lines, even in follow mode\n" " -o --output=STRING Change journal output mode (short, short-monotonic,\n" " verbose, export, json, json-pretty, json-sse, cat)\n" " -q --quiet Don't show privilege warning\n" " -m --merge Show entries from all available journals\n" " -b --this-boot Show data only from current boot\n" " -D --directory=PATH Show journal files from directory\n" " -p --priority=RANGE Show only messages within the specified priority range\n\n" "Commands:\n" " --new-id128 Generate a new 128 Bit ID\n" " --header Show journal header information\n" " --disk-usage Show total disk usage\n" #ifdef HAVE_GCRYPT " --setup-keys Generate new FSS key pair\n" " --interval=TIME Time interval for changing the FSS sealing key\n" " --verify Verify journal file consistency\n" " --verify-key=KEY Specify FSS verification key\n" #endif , program_invocation_short_name); return 0; } static int parse_argv(int argc, char *argv[]) { enum { ARG_VERSION = 0x100, ARG_NO_PAGER, ARG_NO_TAIL, ARG_NEW_ID128, ARG_HEADER, ARG_SETUP_KEYS, ARG_INTERVAL, ARG_VERIFY, ARG_VERIFY_KEY, ARG_DISK_USAGE, ARG_SINCE, ARG_UNTIL }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "version" , no_argument, NULL, ARG_VERSION }, { "no-pager", no_argument, NULL, ARG_NO_PAGER }, { "follow", no_argument, NULL, 'f' }, { "output", required_argument, NULL, 'o' }, { "all", no_argument, NULL, 'a' }, { "lines", optional_argument, NULL, 'n' }, { "no-tail", no_argument, NULL, ARG_NO_TAIL }, { "new-id128", no_argument, NULL, ARG_NEW_ID128 }, { "quiet", no_argument, NULL, 'q' }, { "merge", no_argument, NULL, 'm' }, { "this-boot", no_argument, NULL, 'b' }, { "directory", required_argument, NULL, 'D' }, { "header", no_argument, NULL, ARG_HEADER }, { "priority", no_argument, NULL, 'p' }, { "setup-keys", no_argument, NULL, ARG_SETUP_KEYS }, { "interval", required_argument, NULL, ARG_INTERVAL }, { "verify", no_argument, NULL, ARG_VERIFY }, { "verify-key", required_argument, NULL, ARG_VERIFY_KEY }, { "disk-usage", no_argument, NULL, ARG_DISK_USAGE }, { "cursor", required_argument, NULL, 'c' }, { "since", required_argument, NULL, ARG_SINCE }, { "until", required_argument, NULL, ARG_UNTIL }, { NULL, 0, NULL, 0 } }; int c, r; assert(argc >= 0); assert(argv); while ((c = getopt_long(argc, argv, "hfo:an::qmbD:p:c:", options, NULL)) >= 0) { switch (c) { case 'h': help(); return 0; case ARG_VERSION: puts(PACKAGE_STRING); puts(DISTRIBUTION); puts(SYSTEMD_FEATURES); return 0; case ARG_NO_PAGER: arg_no_pager = true; break; case 'f': arg_follow = true; signal(SIGWINCH, columns_cache_reset); break; case 'o': arg_output = output_mode_from_string(optarg); if (arg_output < 0) { log_error("Unknown output format '%s'.", optarg); return -EINVAL; } if (arg_output == OUTPUT_EXPORT || arg_output == OUTPUT_JSON || arg_output == OUTPUT_JSON_PRETTY || arg_output == OUTPUT_JSON_SSE || arg_output == OUTPUT_CAT) arg_quiet = true; break; case 'a': arg_show_all = true; break; case 'n': if (optarg) { r = safe_atou(optarg, &arg_lines); if (r < 0 || arg_lines <= 0) { log_error("Failed to parse lines '%s'", optarg); return -EINVAL; } } else arg_lines = 10; break; case ARG_NO_TAIL: arg_no_tail = true; break; case ARG_NEW_ID128: arg_action = ACTION_NEW_ID128; break; case 'q': arg_quiet = true; break; case 'm': arg_merge = true; break; case 'b': arg_this_boot = true; break; case 'D': arg_directory = optarg; break; case 'c': arg_cursor = optarg; break; case ARG_HEADER: arg_action = ACTION_PRINT_HEADER; break; case ARG_VERIFY: arg_action = ACTION_VERIFY; break; case ARG_DISK_USAGE: arg_action = ACTION_DISK_USAGE; break; #ifdef HAVE_GCRYPT case ARG_SETUP_KEYS: arg_action = ACTION_SETUP_KEYS; break; case ARG_VERIFY_KEY: arg_action = ACTION_VERIFY; arg_verify_key = optarg; arg_merge = false; break; case ARG_INTERVAL: r = parse_usec(optarg, &arg_interval); if (r < 0 || arg_interval <= 0) { log_error("Failed to parse sealing key change interval: %s", optarg); return -EINVAL; } break; #else case ARG_SETUP_KEYS: case ARG_VERIFY_KEY: case ARG_INTERVAL: log_error("Forward-secure sealing not available."); return -ENOTSUP; #endif case 'p': { const char *dots; dots = strstr(optarg, ".."); if (dots) { char *a; int from, to, i; /* a range */ a = strndup(optarg, dots - optarg); if (!a) return log_oom(); from = log_level_from_string(a); to = log_level_from_string(dots + 2); free(a); if (from < 0 || to < 0) { log_error("Failed to parse log level range %s", optarg); return -EINVAL; } arg_priorities = 0; if (from < to) { for (i = from; i <= to; i++) arg_priorities |= 1 << i; } else { for (i = to; i <= from; i++) arg_priorities |= 1 << i; } } else { int p, i; p = log_level_from_string(optarg); if (p < 0) { log_error("Unknown log level %s", optarg); return -EINVAL; } arg_priorities = 0; for (i = 0; i <= p; i++) arg_priorities |= 1 << i; } break; } case ARG_SINCE: r = parse_timestamp(optarg, &arg_since); if (r < 0) { log_error("Failed to parse timestamp: %s", optarg); return -EINVAL; } arg_since_set = true; break; case ARG_UNTIL: r = parse_timestamp(optarg, &arg_until); if (r < 0) { log_error("Failed to parse timestamp: %s", optarg); return -EINVAL; } arg_until_set = true; break; case '?': return -EINVAL; default: log_error("Unknown option code %c", c); return -EINVAL; } } if (arg_follow && !arg_no_tail && arg_lines <= 0) arg_lines = 10; if (arg_since_set && arg_until_set && arg_since_set > arg_until_set) { log_error("--since= must be before --until=."); return -EINVAL; } if (arg_cursor && arg_since_set) { log_error("Please specify either --since= or --cursor=, not both."); return -EINVAL; } return 1; } static bool on_tty(void) { static int t = -1; /* Note that this is invoked relatively early, before we start * the pager. That means the value we return reflects whether * we originally were started on a tty, not if we currently * are. But this is intended, since we want colour and so on * when run in our own pager. */ if (_unlikely_(t < 0)) t = isatty(STDOUT_FILENO) > 0; return t; } static int generate_new_id128(void) { sd_id128_t id; int r; unsigned i; r = sd_id128_randomize(&id); if (r < 0) { log_error("Failed to generate ID: %s", strerror(-r)); return r; } printf("As string:\n" SD_ID128_FORMAT_STR "\n\n" "As UUID:\n" "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n" "As macro:\n" "#define MESSAGE_XYZ SD_ID128_MAKE(", SD_ID128_FORMAT_VAL(id), SD_ID128_FORMAT_VAL(id)); for (i = 0; i < 16; i++) printf("%02x%s", id.bytes[i], i != 15 ? "," : ""); fputs(")\n", stdout); return 0; } static int add_matches(sd_journal *j, char **args) { char **i; int r; assert(j); STRV_FOREACH(i, args) { if (streq(*i, "+")) r = sd_journal_add_disjunction(j); else if (path_is_absolute(*i)) { char *p, *t = NULL; const char *path; struct stat st; p = canonicalize_file_name(*i); path = p ? p : *i; if (stat(path, &st) < 0) { free(p); log_error("Couldn't stat file: %m"); return -errno; } if (S_ISREG(st.st_mode) && (0111 & st.st_mode)) t = strappend("_EXE=", path); else if (S_ISCHR(st.st_mode)) asprintf(&t, "_KERNEL_DEVICE=c%u:%u", major(st.st_rdev), minor(st.st_rdev)); else if (S_ISBLK(st.st_mode)) asprintf(&t, "_KERNEL_DEVICE=b%u:%u", major(st.st_rdev), minor(st.st_rdev)); else { free(p); log_error("File is not a device node, regular file or is not executable: %s", *i); return -EINVAL; } free(p); if (!t) return log_oom(); r = sd_journal_add_match(j, t, 0); free(t); } else r = sd_journal_add_match(j, *i, 0); if (r < 0) { log_error("Failed to add match '%s': %s", *i, strerror(-r)); return r; } } return 0; } static int add_this_boot(sd_journal *j) { char match[9+32+1] = "_BOOT_ID="; sd_id128_t boot_id; int r; assert(j); if (!arg_this_boot) return 0; r = sd_id128_get_boot(&boot_id); if (r < 0) { log_error("Failed to get boot id: %s", strerror(-r)); return r; } sd_id128_to_string(boot_id, match + 9); r = sd_journal_add_match(j, match, strlen(match)); if (r < 0) { log_error("Failed to add match: %s", strerror(-r)); return r; } return 0; } static int add_priorities(sd_journal *j) { char match[] = "PRIORITY=0"; int i, r; assert(j); if (arg_priorities == 0xFF) return 0; for (i = LOG_EMERG; i <= LOG_DEBUG; i++) if (arg_priorities & (1 << i)) { match[sizeof(match)-2] = '0' + i; log_info("adding match %s", match); r = sd_journal_add_match(j, match, strlen(match)); if (r < 0) { log_error("Failed to add match: %s", strerror(-r)); return r; } } return 0; } static int setup_keys(void) { #ifdef HAVE_GCRYPT size_t mpk_size, seed_size, state_size, i; uint8_t *mpk, *seed, *state; ssize_t l; int fd = -1, r, attr = 0; sd_id128_t machine, boot; char *p = NULL, *k = NULL; struct FSSHeader h; uint64_t n; r = sd_id128_get_machine(&machine); if (r < 0) { log_error("Failed to get machine ID: %s", strerror(-r)); return r; } r = sd_id128_get_boot(&boot); if (r < 0) { log_error("Failed to get boot ID: %s", strerror(-r)); return r; } if (asprintf(&p, "/var/log/journal/" SD_ID128_FORMAT_STR "/fss", SD_ID128_FORMAT_VAL(machine)) < 0) return log_oom(); if (access(p, F_OK) >= 0) { log_error("Sealing key file %s exists already.", p); r = -EEXIST; goto finish; } if (asprintf(&k, "/var/log/journal/" SD_ID128_FORMAT_STR "/fss.tmp.XXXXXX", SD_ID128_FORMAT_VAL(machine)) < 0) { r = log_oom(); goto finish; } mpk_size = FSPRG_mskinbytes(FSPRG_RECOMMENDED_SECPAR); mpk = alloca(mpk_size); seed_size = FSPRG_RECOMMENDED_SEEDLEN; seed = alloca(seed_size); state_size = FSPRG_stateinbytes(FSPRG_RECOMMENDED_SECPAR); state = alloca(state_size); fd = open("/dev/random", O_RDONLY|O_CLOEXEC|O_NOCTTY); if (fd < 0) { log_error("Failed to open /dev/random: %m"); r = -errno; goto finish; } log_info("Generating seed..."); l = loop_read(fd, seed, seed_size, true); if (l < 0 || (size_t) l != seed_size) { log_error("Failed to read random seed: %s", strerror(EIO)); r = -EIO; goto finish; } log_info("Generating key pair..."); FSPRG_GenMK(NULL, mpk, seed, seed_size, FSPRG_RECOMMENDED_SECPAR); log_info("Generating sealing key..."); FSPRG_GenState0(state, mpk, seed, seed_size); assert(arg_interval > 0); n = now(CLOCK_REALTIME); n /= arg_interval; close_nointr_nofail(fd); fd = mkostemp(k, O_WRONLY|O_CLOEXEC|O_NOCTTY); if (fd < 0) { log_error("Failed to open %s: %m", k); r = -errno; goto finish; } /* Enable secure remove, exclusion from dump, synchronous * writing and in-place updating */ if (ioctl(fd, FS_IOC_GETFLAGS, &attr) < 0) log_warning("FS_IOC_GETFLAGS failed: %m"); attr |= FS_SECRM_FL|FS_NODUMP_FL|FS_SYNC_FL|FS_NOCOW_FL; if (ioctl(fd, FS_IOC_SETFLAGS, &attr) < 0) log_warning("FS_IOC_SETFLAGS failed: %m"); zero(h); memcpy(h.signature, "KSHHRHLP", 8); h.machine_id = machine; h.boot_id = boot; h.header_size = htole64(sizeof(h)); h.start_usec = htole64(n * arg_interval); h.interval_usec = htole64(arg_interval); h.fsprg_secpar = htole16(FSPRG_RECOMMENDED_SECPAR); h.fsprg_state_size = htole64(state_size); l = loop_write(fd, &h, sizeof(h), false); if (l < 0 || (size_t) l != sizeof(h)) { log_error("Failed to write header: %s", strerror(EIO)); r = -EIO; goto finish; } l = loop_write(fd, state, state_size, false); if (l < 0 || (size_t) l != state_size) { log_error("Failed to write state: %s", strerror(EIO)); r = -EIO; goto finish; } if (link(k, p) < 0) { log_error("Failed to link file: %m"); r = -errno; goto finish; } if (isatty(STDOUT_FILENO)) { fprintf(stderr, "\n" "The new key pair has been generated. The " ANSI_HIGHLIGHT_ON "secret sealing key" ANSI_HIGHLIGHT_OFF " has been written to\n" "the following local file. This key file is automatically updated when the\n" "sealing key is advanced. It should not be used on multiple hosts.\n" "\n" "\t%s\n" "\n" "Please write down the following " ANSI_HIGHLIGHT_ON "secret verification key" ANSI_HIGHLIGHT_OFF ". It should be stored\n" "at a safe location and should not be saved locally on disk.\n" "\n\t" ANSI_HIGHLIGHT_RED_ON, p); fflush(stderr); } for (i = 0; i < seed_size; i++) { if (i > 0 && i % 3 == 0) putchar('-'); printf("%02x", ((uint8_t*) seed)[i]); } printf("/%llx-%llx\n", (unsigned long long) n, (unsigned long long) arg_interval); if (isatty(STDOUT_FILENO)) { char tsb[FORMAT_TIMESPAN_MAX], *hn; fprintf(stderr, ANSI_HIGHLIGHT_OFF "\n" "The sealing key is automatically changed every %s.\n", format_timespan(tsb, sizeof(tsb), arg_interval)); hn = gethostname_malloc(); if (hn) { hostname_cleanup(hn); fprintf(stderr, "\nThe keys have been generated for host %s/" SD_ID128_FORMAT_STR ".\n", hn, SD_ID128_FORMAT_VAL(machine)); } else fprintf(stderr, "\nThe keys have been generated for host " SD_ID128_FORMAT_STR ".\n", SD_ID128_FORMAT_VAL(machine)); #ifdef HAVE_QRENCODE /* If this is not an UTF-8 system don't print any QR codes */ setlocale(LC_CTYPE, ""); if (streq_ptr(nl_langinfo(CODESET), "UTF-8")) { fputs("\nTo transfer the verification key to your phone please scan the QR code below:\n\n", stderr); print_qr_code(stderr, seed, seed_size, n, arg_interval, hn, machine); } #endif free(hn); } r = 0; finish: if (fd >= 0) close_nointr_nofail(fd); if (k) { unlink(k); free(k); } free(p); return r; #else log_error("Forward-secure sealing not available."); return -ENOTSUP; #endif } static int verify(sd_journal *j) { int r = 0; Iterator i; JournalFile *f; assert(j); log_show_color(true); HASHMAP_FOREACH(f, j->files, i) { int k; usec_t first, validated, last; #ifdef HAVE_GCRYPT if (!arg_verify_key && JOURNAL_HEADER_SEALED(f->header)) log_notice("Journal file %s has sealing enabled but verification key has not been passed using --verify-key=.", f->path); #endif k = journal_file_verify(f, arg_verify_key, &first, &validated, &last, true); if (k == -EINVAL) { /* If the key was invalid give up right-away. */ return k; } else if (k < 0) { log_warning("FAIL: %s (%s)", f->path, strerror(-k)); r = k; } else { char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX], c[FORMAT_TIMESPAN_MAX]; log_info("PASS: %s", f->path); if (arg_verify_key && JOURNAL_HEADER_SEALED(f->header)) { if (validated > 0) { log_info("=> Validated from %s to %s, final %s entries not sealed.", format_timestamp(a, sizeof(a), first), format_timestamp(b, sizeof(b), validated), format_timespan(c, sizeof(c), last > validated ? last - validated : 0)); } else if (last > 0) log_info("=> No sealing yet, %s of entries not sealed.", format_timespan(c, sizeof(c), last - first)); else log_info("=> No sealing yet, no entries in file."); } } } return r; } int main(int argc, char *argv[]) { int r; sd_journal *j = NULL; bool need_seek = false; sd_id128_t previous_boot_id; bool previous_boot_id_valid = false; bool have_pager; unsigned n_shown = 0; log_parse_environment(); log_open(); r = parse_argv(argc, argv); if (r <= 0) goto finish; if (arg_action == ACTION_NEW_ID128) { r = generate_new_id128(); goto finish; } if (arg_action == ACTION_SETUP_KEYS) { r = setup_keys(); goto finish; } if (arg_directory) r = sd_journal_open_directory(&j, arg_directory, 0); else r = sd_journal_open(&j, arg_merge ? 0 : SD_JOURNAL_LOCAL_ONLY); if (r < 0) { log_error("Failed to open journal: %s", strerror(-r)); goto finish; } if (arg_action == ACTION_VERIFY) { r = verify(j); goto finish; } if (arg_action == ACTION_PRINT_HEADER) { journal_print_header(j); r = 0; goto finish; } if (arg_action == ACTION_DISK_USAGE) { uint64_t bytes; char sbytes[FORMAT_BYTES_MAX]; r = sd_journal_get_usage(j, &bytes); if (r < 0) goto finish; printf("Journals take up %s on disk.\n", format_bytes(sbytes, sizeof(sbytes), bytes)); r = 0; goto finish; } #ifdef HAVE_ACL if (access("/var/log/journal", F_OK) < 0 && geteuid() != 0 && in_group("adm") <= 0) { log_error("Unprivileged users can't see messages unless persistent log storage is enabled. Users in the group 'adm' can always see messages."); r = -EACCES; goto finish; } if (!arg_quiet && geteuid() != 0 && in_group("adm") <= 0) log_warning("Showing user generated messages only. Users in the group 'adm' can see all messages. Pass -q to turn this notice off."); #else if (geteuid() != 0 && in_group("adm") <= 0) { log_error("No access to messages. Only users in the group 'adm' can see messages."); r = -EACCES; goto finish; } #endif r = add_this_boot(j); if (r < 0) goto finish; r = add_matches(j, argv + optind); if (r < 0) goto finish; r = add_priorities(j); if (r < 0) goto finish; if (arg_cursor) { r = sd_journal_seek_cursor(j, arg_cursor); if (r < 0) { log_error("Failed to seek to cursor: %s", strerror(-r)); goto finish; } r = sd_journal_next(j); } else if (arg_since_set) { r = sd_journal_seek_realtime_usec(j, arg_since); if (r < 0) { log_error("Failed to seek to date: %s", strerror(-r)); goto finish; } r = sd_journal_next(j); } else if (arg_lines > 0) { r = sd_journal_seek_tail(j); if (r < 0) { log_error("Failed to seek to tail: %s", strerror(-r)); goto finish; } r = sd_journal_previous_skip(j, arg_lines); } else { r = sd_journal_seek_head(j); if (r < 0) { log_error("Failed to seek to head: %s", strerror(-r)); goto finish; } r = sd_journal_next(j); } if (r < 0) { log_error("Failed to iterate through journal: %s", strerror(-r)); goto finish; } on_tty(); have_pager = !arg_no_pager && !arg_follow && pager_open(); if (!arg_quiet) { usec_t start, end; char start_buf[FORMAT_TIMESTAMP_MAX], end_buf[FORMAT_TIMESTAMP_MAX]; r = sd_journal_get_cutoff_realtime_usec(j, &start, &end); if (r < 0) { log_error("Failed to get cutoff: %s", strerror(-r)); goto finish; } if (r > 0) { if (arg_follow) printf("-- Logs begin at %s. --\n", format_timestamp(start_buf, sizeof(start_buf), start)); else printf("-- Logs begin at %s, end at %s. --\n", format_timestamp(start_buf, sizeof(start_buf), start), format_timestamp(end_buf, sizeof(end_buf), end)); } } for (;;) { while (arg_lines == 0 || arg_follow || n_shown < arg_lines) { int flags; if (need_seek) { r = sd_journal_next(j); if (r < 0) { log_error("Failed to iterate through journal: %s", strerror(-r)); goto finish; } } if (r == 0) break; if (arg_until_set) { usec_t usec; r = sd_journal_get_realtime_usec(j, &usec); if (r < 0) { log_error("Failed to determine timestamp: %s", strerror(-r)); goto finish; } } if (!arg_merge) { sd_id128_t boot_id; r = sd_journal_get_monotonic_usec(j, NULL, &boot_id); if (r >= 0) { if (previous_boot_id_valid && !sd_id128_equal(boot_id, previous_boot_id)) printf(ANSI_HIGHLIGHT_ON "-- Reboot --" ANSI_HIGHLIGHT_OFF "\n"); previous_boot_id = boot_id; previous_boot_id_valid = true; } } flags = arg_show_all * OUTPUT_SHOW_ALL | have_pager * OUTPUT_FULL_WIDTH | on_tty() * OUTPUT_COLOR; r = output_journal(stdout, j, arg_output, 0, flags); if (r < 0) goto finish; need_seek = true; n_shown++; } if (!arg_follow) break; r = sd_journal_wait(j, (uint64_t) -1); if (r < 0) { log_error("Couldn't wait for journal event: %s", strerror(-r)); goto finish; } } finish: if (j) sd_journal_close(j); pager_close(); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }