1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
34 #include <systemd/sd-journal.h>
38 #include "path-util.h"
41 #include "logs-show.h"
43 #include "journal-internal.h"
45 static OutputMode arg_output = OUTPUT_SHORT;
46 static bool arg_follow = false;
47 static bool arg_show_all = false;
48 static bool arg_no_pager = false;
49 static int arg_lines = -1;
50 static bool arg_no_tail = false;
51 static bool arg_new_id128 = false;
52 static bool arg_print_header = false;
53 static bool arg_quiet = false;
54 static bool arg_local = false;
55 static bool arg_this_boot = false;
56 static const char *arg_directory = NULL;
58 static int help(void) {
60 printf("%s [OPTIONS...] [MATCH]\n\n"
61 "Send control commands to or query the journal.\n\n"
62 " -h --help Show this help\n"
63 " --version Show package version\n"
64 " --no-pager Do not pipe output into a pager\n"
65 " -a --all Show all fields, including long and unprintable\n"
66 " -f --follow Follow journal\n"
67 " -n --lines=INTEGER Journal entries to show\n"
68 " --no-tail Show all lines, even in follow mode\n"
69 " -o --output=STRING Change journal output mode (short, short-monotonic,\n"
70 " verbose, export, json, cat)\n"
71 " -q --quiet Don't show privilege warning\n"
72 " -l --local Only local entries\n"
73 " -b --this-boot Show data only from current boot\n"
74 " -D --directory=PATH Show journal files from directory\n"
75 " --header Show journal header information\n"
76 " --new-id128 Generate a new 128 Bit id\n",
77 program_invocation_short_name);
82 static int parse_argv(int argc, char *argv[]) {
92 static const struct option options[] = {
93 { "help", no_argument, NULL, 'h' },
94 { "version" , no_argument, NULL, ARG_VERSION },
95 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
96 { "follow", no_argument, NULL, 'f' },
97 { "output", required_argument, NULL, 'o' },
98 { "all", no_argument, NULL, 'a' },
99 { "lines", required_argument, NULL, 'n' },
100 { "no-tail", no_argument, NULL, ARG_NO_TAIL },
101 { "new-id128", no_argument, NULL, ARG_NEW_ID128 },
102 { "quiet", no_argument, NULL, 'q' },
103 { "local", no_argument, NULL, 'l' },
104 { "this-boot", no_argument, NULL, 'b' },
105 { "directory", required_argument, NULL, 'D' },
106 { "header", no_argument, NULL, ARG_HEADER },
115 while ((c = getopt_long(argc, argv, "hfo:an:qlbD:", options, NULL)) >= 0) {
124 puts(PACKAGE_STRING);
126 puts(SYSTEMD_FEATURES);
138 arg_output = output_mode_from_string(optarg);
139 if (arg_output < 0) {
140 log_error("Unknown output '%s'.", optarg);
151 r = safe_atoi(optarg, &arg_lines);
152 if (r < 0 || arg_lines < 0) {
153 log_error("Failed to parse lines '%s'", optarg);
163 arg_new_id128 = true;
175 arg_this_boot = true;
179 arg_directory = optarg;
183 arg_print_header = true;
190 log_error("Unknown option code %c", c);
195 if (arg_follow && !arg_no_tail && arg_lines < 0)
201 static int generate_new_id128(void) {
206 r = sd_id128_randomize(&id);
208 log_error("Failed to generate ID: %s", strerror(-r));
212 printf("As string:\n"
213 SD_ID128_FORMAT_STR "\n\n"
215 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n"
217 "#define MESSAGE_XYZ SD_ID128_MAKE(",
218 SD_ID128_FORMAT_VAL(id),
219 SD_ID128_FORMAT_VAL(id));
221 for (i = 0; i < 16; i++)
222 printf("%02x%s", id.bytes[i], i != 15 ? "," : "");
224 fputs(")\n", stdout);
229 static int add_matches(sd_journal *j, char **args) {
235 STRV_FOREACH(i, args) {
238 r = sd_journal_add_disjunction(j);
239 else if (path_is_absolute(*i)) {
244 p = canonicalize_file_name(*i);
247 if (stat(path, &st) < 0) {
249 log_error("Couldn't stat file: %m");
253 if (S_ISREG(st.st_mode) && (0111 & st.st_mode)) {
256 t = strappend("_EXE=", path);
262 r = sd_journal_add_match(j, t, 0);
266 log_error("File is not a regular file or is not executable: %s", *i);
272 r = sd_journal_add_match(j, *i, 0);
275 log_error("Failed to add match '%s': %s", *i, strerror(-r));
283 static int add_this_boot(sd_journal *j) {
284 char match[9+32+1] = "_BOOT_ID=";
291 r = sd_id128_get_boot(&boot_id);
293 log_error("Failed to get boot id: %s", strerror(-r));
297 sd_id128_to_string(boot_id, match + 9);
298 r = sd_journal_add_match(j, match, strlen(match));
300 log_error("Failed to add match: %s", strerror(-r));
307 int main(int argc, char *argv[]) {
309 sd_journal *j = NULL;
311 bool need_seek = false;
312 sd_id128_t previous_boot_id;
313 bool previous_boot_id_valid = false;
316 log_parse_environment();
319 r = parse_argv(argc, argv);
324 r = generate_new_id128();
329 if (!arg_quiet && geteuid() != 0 && in_group("adm") <= 0)
330 log_warning("Showing user generated messages only. Users in the group 'adm' can see all messages. Pass -q to turn this message off.");
334 r = sd_journal_open_directory(&j, arg_directory, 0);
336 r = sd_journal_open(&j, arg_local ? SD_JOURNAL_LOCAL_ONLY : 0);
339 log_error("Failed to open journal: %s", strerror(-r));
343 if (arg_print_header) {
344 journal_print_header(j);
349 r = add_this_boot(j);
353 r = add_matches(j, argv + optind);
359 char start_buf[FORMAT_TIMESTAMP_MAX], end_buf[FORMAT_TIMESTAMP_MAX];
361 r = sd_journal_get_cutoff_realtime_usec(j, &start, &end);
363 log_error("Failed to get cutoff: %s", strerror(-r));
369 printf("Logs begin at %s.\n", format_timestamp(start_buf, sizeof(start_buf), start));
371 printf("Logs begin at %s, end at %s.\n",
372 format_timestamp(start_buf, sizeof(start_buf), start),
373 format_timestamp(end_buf, sizeof(end_buf), end));
377 if (arg_lines >= 0) {
378 r = sd_journal_seek_tail(j);
380 log_error("Failed to seek to tail: %s", strerror(-r));
384 r = sd_journal_previous_skip(j, arg_lines);
386 r = sd_journal_seek_head(j);
388 log_error("Failed to seek to head: %s", strerror(-r));
392 r = sd_journal_next(j);
396 log_error("Failed to iterate through journal: %s", strerror(-r));
400 have_pager = !arg_no_pager && !arg_follow && pager_open();
402 if (arg_output == OUTPUT_JSON) {
410 int flags = (arg_show_all*OUTPUT_SHOW_ALL |
411 have_pager*OUTPUT_FULL_WIDTH);
414 r = sd_journal_next(j);
416 log_error("Failed to iterate through journal: %s", strerror(-r));
424 r = sd_journal_get_monotonic_usec(j, NULL, &boot_id);
426 if (previous_boot_id_valid &&
427 !sd_id128_equal(boot_id, previous_boot_id))
428 printf(ANSI_HIGHLIGHT_ON "----- Reboot -----" ANSI_HIGHLIGHT_OFF "\n");
430 previous_boot_id = boot_id;
431 previous_boot_id_valid = true;
436 r = output_journal(j, arg_output, line, 0, flags);
446 r = sd_journal_wait(j, (uint64_t) -1);
448 log_error("Couldn't wait for log event: %s", strerror(-r));
453 if (arg_output == OUTPUT_JSON)
454 fputs("\n]\n", stdout);
462 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;