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87d2c1ff LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <fcntl.h> | |
23 | #include <errno.h> | |
24 | #include <stddef.h> | |
3fbf9cbb LP |
25 | #include <string.h> |
26 | #include <stdio.h> | |
27 | #include <unistd.h> | |
28 | #include <stdlib.h> | |
50f20cfd | 29 | #include <sys/poll.h> |
72f59706 | 30 | #include <time.h> |
0d43c694 | 31 | #include <getopt.h> |
87d2c1ff | 32 | |
81527be1 LP |
33 | #include <systemd/sd-journal.h> |
34 | ||
3fbf9cbb | 35 | #include "log.h" |
72f59706 | 36 | #include "util.h" |
0d43c694 LP |
37 | #include "build.h" |
38 | #include "pager.h" | |
86aa7ba4 | 39 | #include "logs-show.h" |
250d54b5 | 40 | |
df50185b | 41 | static OutputMode arg_output = OUTPUT_SHORT; |
72f59706 LP |
42 | static bool arg_follow = false; |
43 | static bool arg_show_all = false; | |
0d43c694 | 44 | static bool arg_no_pager = false; |
2100675e | 45 | static int arg_lines = -1; |
e91af489 | 46 | static bool arg_no_tail = false; |
39f7f5c1 | 47 | static bool arg_new_id128 = false; |
43673799 | 48 | static bool arg_quiet = false; |
50f20cfd | 49 | |
0d43c694 LP |
50 | static int help(void) { |
51 | ||
52 | printf("%s [OPTIONS...] {COMMAND} ...\n\n" | |
df50185b | 53 | "Send control commands to or query the journal.\n\n" |
0d43c694 LP |
54 | " -h --help Show this help\n" |
55 | " --version Show package version\n" | |
56 | " --no-pager Do not pipe output into a pager\n" | |
2af777ba | 57 | " -a --all Show all fields, including long and unprintable\n" |
0d43c694 | 58 | " -f --follow Follow journal\n" |
df50185b | 59 | " -n --lines=INTEGER Journal entries to show\n" |
e91af489 | 60 | " --no-tail Show all lines, even in follow mode\n" |
d3f2bdbf LP |
61 | " -o --output=STRING Change journal output mode (short, short-monotonic,\n" |
62 | " verbose, export, json, cat)\n" | |
43673799 | 63 | " -q --quiet Don't show privilege warning\n" |
39f7f5c1 | 64 | " --new-id128 Generate a new 128 Bit id\n", |
0d43c694 LP |
65 | program_invocation_short_name); |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | static int parse_argv(int argc, char *argv[]) { | |
71 | ||
72 | enum { | |
73 | ARG_VERSION = 0x100, | |
e91af489 | 74 | ARG_NO_PAGER, |
55ee336c | 75 | ARG_NO_TAIL, |
39f7f5c1 | 76 | ARG_NEW_ID128 |
0d43c694 LP |
77 | }; |
78 | ||
79 | static const struct option options[] = { | |
80 | { "help", no_argument, NULL, 'h' }, | |
81 | { "version" , no_argument, NULL, ARG_VERSION }, | |
82 | { "no-pager", no_argument, NULL, ARG_NO_PAGER }, | |
83 | { "follow", no_argument, NULL, 'f' }, | |
84 | { "output", required_argument, NULL, 'o' }, | |
85 | { "all", no_argument, NULL, 'a' }, | |
2100675e | 86 | { "lines", required_argument, NULL, 'n' }, |
e91af489 | 87 | { "no-tail", no_argument, NULL, ARG_NO_TAIL }, |
39f7f5c1 | 88 | { "new-id128", no_argument, NULL, ARG_NEW_ID128 }, |
43673799 | 89 | { "quiet", no_argument, NULL, 'q' }, |
0d43c694 LP |
90 | { NULL, 0, NULL, 0 } |
91 | }; | |
92 | ||
2100675e | 93 | int c, r; |
0d43c694 LP |
94 | |
95 | assert(argc >= 0); | |
96 | assert(argv); | |
97 | ||
43673799 | 98 | while ((c = getopt_long(argc, argv, "hfo:an:q", options, NULL)) >= 0) { |
0d43c694 LP |
99 | |
100 | switch (c) { | |
101 | ||
102 | case 'h': | |
103 | help(); | |
104 | return 0; | |
105 | ||
106 | case ARG_VERSION: | |
107 | puts(PACKAGE_STRING); | |
108 | puts(DISTRIBUTION); | |
109 | puts(SYSTEMD_FEATURES); | |
110 | return 0; | |
111 | ||
112 | case ARG_NO_PAGER: | |
113 | arg_no_pager = true; | |
114 | break; | |
115 | ||
116 | case 'f': | |
117 | arg_follow = true; | |
118 | break; | |
119 | ||
120 | case 'o': | |
df50185b LP |
121 | arg_output = output_mode_from_string(optarg); |
122 | if (arg_output < 0) { | |
0d43c694 LP |
123 | log_error("Unknown output '%s'.", optarg); |
124 | return -EINVAL; | |
125 | } | |
df50185b | 126 | |
0d43c694 LP |
127 | break; |
128 | ||
129 | case 'a': | |
130 | arg_show_all = true; | |
131 | break; | |
132 | ||
2100675e LP |
133 | case 'n': |
134 | r = safe_atoi(optarg, &arg_lines); | |
e91af489 | 135 | if (r < 0 || arg_lines < 0) { |
2100675e LP |
136 | log_error("Failed to parse lines '%s'", optarg); |
137 | return -EINVAL; | |
138 | } | |
139 | break; | |
140 | ||
e91af489 LP |
141 | case ARG_NO_TAIL: |
142 | arg_no_tail = true; | |
143 | break; | |
144 | ||
39f7f5c1 LP |
145 | case ARG_NEW_ID128: |
146 | arg_new_id128 = true; | |
55ee336c LP |
147 | break; |
148 | ||
43673799 LP |
149 | case 'q': |
150 | arg_quiet = true; | |
490e567d | 151 | break; |
43673799 | 152 | |
0d43c694 LP |
153 | case '?': |
154 | return -EINVAL; | |
155 | ||
156 | default: | |
157 | log_error("Unknown option code %c", c); | |
158 | return -EINVAL; | |
159 | } | |
160 | } | |
161 | ||
62f21ec9 | 162 | if (arg_follow && !arg_no_tail && arg_lines < 0) |
e91af489 LP |
163 | arg_lines = 10; |
164 | ||
0d43c694 LP |
165 | return 1; |
166 | } | |
167 | ||
39f7f5c1 | 168 | static int generate_new_id128(void) { |
55ee336c LP |
169 | sd_id128_t id; |
170 | int r; | |
171 | unsigned i; | |
172 | ||
173 | r = sd_id128_randomize(&id); | |
174 | if (r < 0) { | |
175 | log_error("Failed to generate ID: %s", strerror(-r)); | |
176 | return r; | |
177 | } | |
178 | ||
179 | printf("As string:\n" | |
180 | SD_ID128_FORMAT_STR "\n\n" | |
181 | "As UUID:\n" | |
182 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n" | |
183 | "As macro:\n" | |
184 | "#define MESSAGE_XYZ SD_ID128_MAKE(", | |
185 | SD_ID128_FORMAT_VAL(id), | |
186 | SD_ID128_FORMAT_VAL(id)); | |
187 | ||
188 | for (i = 0; i < 16; i++) | |
189 | printf("%02x%s", id.bytes[i], i != 15 ? "," : ""); | |
190 | ||
191 | fputs(")\n", stdout); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
87d2c1ff | 196 | int main(int argc, char *argv[]) { |
50f20cfd | 197 | int r, i, fd; |
3fbf9cbb | 198 | sd_journal *j = NULL; |
72f59706 | 199 | unsigned line = 0; |
6f003b43 | 200 | bool need_seek = false; |
3fbf9cbb | 201 | |
87d2c1ff LP |
202 | log_parse_environment(); |
203 | log_open(); | |
204 | ||
0d43c694 LP |
205 | r = parse_argv(argc, argv); |
206 | if (r <= 0) | |
207 | goto finish; | |
208 | ||
39f7f5c1 LP |
209 | if (arg_new_id128) { |
210 | r = generate_new_id128(); | |
55ee336c LP |
211 | goto finish; |
212 | } | |
213 | ||
4f4d6a70 | 214 | #ifdef HAVE_ACL |
43673799 LP |
215 | if (!arg_quiet && geteuid() != 0 && in_group("adm") <= 0) |
216 | log_warning("Showing user generated messages only. Users in the group 'adm' can see all messages. Pass -q to turn this message off."); | |
4f4d6a70 | 217 | #endif |
43673799 | 218 | |
cf244689 | 219 | r = sd_journal_open(&j, 0); |
87d2c1ff LP |
220 | if (r < 0) { |
221 | log_error("Failed to open journal: %s", strerror(-r)); | |
3fbf9cbb | 222 | goto finish; |
87d2c1ff LP |
223 | } |
224 | ||
0d43c694 | 225 | for (i = optind; i < argc; i++) { |
de7b95cd LP |
226 | r = sd_journal_add_match(j, argv[i], strlen(argv[i])); |
227 | if (r < 0) { | |
228 | log_error("Failed to add match: %s", strerror(-r)); | |
229 | goto finish; | |
230 | } | |
231 | } | |
232 | ||
50f20cfd LP |
233 | fd = sd_journal_get_fd(j); |
234 | if (fd < 0) { | |
235 | log_error("Failed to get wakeup fd: %s", strerror(-fd)); | |
236 | goto finish; | |
237 | } | |
8725d60a | 238 | |
2100675e LP |
239 | if (arg_lines >= 0) { |
240 | r = sd_journal_seek_tail(j); | |
241 | if (r < 0) { | |
242 | log_error("Failed to seek to tail: %s", strerror(-r)); | |
243 | goto finish; | |
244 | } | |
245 | ||
246 | r = sd_journal_previous_skip(j, arg_lines); | |
2100675e LP |
247 | } else { |
248 | r = sd_journal_seek_head(j); | |
249 | if (r < 0) { | |
250 | log_error("Failed to seek to head: %s", strerror(-r)); | |
251 | goto finish; | |
252 | } | |
6f003b43 LP |
253 | |
254 | r = sd_journal_next(j); | |
255 | } | |
256 | ||
257 | if (r < 0) { | |
258 | log_error("Failed to iterate through journal: %s", strerror(-r)); | |
259 | goto finish; | |
50f20cfd | 260 | } |
87d2c1ff | 261 | |
0d43c694 LP |
262 | if (!arg_no_pager && !arg_follow) { |
263 | columns(); | |
264 | pager_open(); | |
265 | } | |
266 | ||
267 | if (arg_output == OUTPUT_JSON) { | |
72f59706 | 268 | fputc('[', stdout); |
0d43c694 LP |
269 | fflush(stdout); |
270 | } | |
72f59706 | 271 | |
50f20cfd | 272 | for (;;) { |
0d43c694 | 273 | for (;;) { |
6f003b43 LP |
274 | if (need_seek) { |
275 | r = sd_journal_next(j); | |
276 | if (r < 0) { | |
277 | log_error("Failed to iterate through journal: %s", strerror(-r)); | |
278 | goto finish; | |
279 | } | |
0d43c694 LP |
280 | } |
281 | ||
282 | if (r == 0) | |
283 | break; | |
284 | ||
72f59706 | 285 | line ++; |
50f20cfd | 286 | |
34a35ece | 287 | r = output_journal(j, arg_output, line, 0, arg_show_all); |
72f59706 LP |
288 | if (r < 0) |
289 | goto finish; | |
6f003b43 LP |
290 | |
291 | need_seek = true; | |
87d2c1ff LP |
292 | } |
293 | ||
50f20cfd LP |
294 | if (!arg_follow) |
295 | break; | |
296 | ||
8f2d43a0 | 297 | r = fd_wait_for_event(fd, POLLIN, (usec_t) -1); |
df50185b LP |
298 | if (r < 0) { |
299 | log_error("Couldn't wait for event: %s", strerror(-r)); | |
50f20cfd LP |
300 | goto finish; |
301 | } | |
8725d60a | 302 | |
50f20cfd LP |
303 | r = sd_journal_process(j); |
304 | if (r < 0) { | |
305 | log_error("Failed to process: %s", strerror(-r)); | |
306 | goto finish; | |
307 | } | |
de190aef | 308 | } |
87d2c1ff | 309 | |
72f59706 LP |
310 | if (arg_output == OUTPUT_JSON) |
311 | fputs("\n]\n", stdout); | |
312 | ||
87d2c1ff | 313 | finish: |
3fbf9cbb LP |
314 | if (j) |
315 | sd_journal_close(j); | |
87d2c1ff | 316 | |
0d43c694 LP |
317 | pager_close(); |
318 | ||
3fbf9cbb | 319 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
87d2c1ff | 320 | } |