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Commit | Line | Data |
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5ef05369 KZ |
1 | /* |
2 | * dmesg.c -- Print out the contents of the kernel ring buffer | |
7eda085c | 3 | * |
5ef05369 KZ |
4 | * Copyright (C) 1993 Theodore Ts'o <tytso@athena.mit.edu> |
5 | * Copyright (C) 2011 Karel Zak <kzak@redhat.com> | |
6 | * | |
7 | * This program comes with ABSOLUTELY NO WARRANTY. | |
6dbe3af9 | 8 | */ |
6dbe3af9 KZ |
9 | #include <stdio.h> |
10 | #include <getopt.h> | |
fd6b7a7f | 11 | #include <stdlib.h> |
15673c15 | 12 | #include <sys/klog.h> |
f06ec64f | 13 | #include <sys/syslog.h> |
bd304d92 | 14 | #include <sys/time.h> |
42fac79a | 15 | #include <sys/sysinfo.h> |
15103c4b | 16 | #include <ctype.h> |
bd304d92 | 17 | #include <time.h> |
c672220f KZ |
18 | #include <sys/mman.h> |
19 | #include <sys/types.h> | |
20 | #include <sys/stat.h> | |
21 | #include <unistd.h> | |
22 | #include <fcntl.h> | |
22eb2f01 | 23 | #include <poll.h> |
5423ccb1 | 24 | |
15103c4b | 25 | #include "c.h" |
098ce273 | 26 | #include "colors.h" |
5423ccb1 | 27 | #include "nls.h" |
15673c15 | 28 | #include "strutils.h" |
15103c4b | 29 | #include "xalloc.h" |
b8300c0a | 30 | #include "widechar.h" |
e12c9866 | 31 | #include "all-io.h" |
636a6207 | 32 | #include "bitops.h" |
efb8854f | 33 | #include "closestream.h" |
94920134 | 34 | #include "optutils.h" |
d12d063b | 35 | #include "timeutils.h" |
cd2876d2 | 36 | #include "monotonic.h" |
ddca870a | 37 | #include "mangle.h" |
aa192520 | 38 | #include "pager.h" |
6dbe3af9 | 39 | |
59a14899 KZ |
40 | /* Close the log. Currently a NOP. */ |
41 | #define SYSLOG_ACTION_CLOSE 0 | |
42 | /* Open the log. Currently a NOP. */ | |
43 | #define SYSLOG_ACTION_OPEN 1 | |
44 | /* Read from the log. */ | |
45 | #define SYSLOG_ACTION_READ 2 | |
46 | /* Read all messages remaining in the ring buffer. (allowed for non-root) */ | |
47 | #define SYSLOG_ACTION_READ_ALL 3 | |
48 | /* Read and clear all messages remaining in the ring buffer */ | |
49 | #define SYSLOG_ACTION_READ_CLEAR 4 | |
50 | /* Clear ring buffer. */ | |
51 | #define SYSLOG_ACTION_CLEAR 5 | |
52 | /* Disable printk's to console */ | |
53 | #define SYSLOG_ACTION_CONSOLE_OFF 6 | |
54 | /* Enable printk's to console */ | |
55 | #define SYSLOG_ACTION_CONSOLE_ON 7 | |
56 | /* Set level of messages printed to console */ | |
57 | #define SYSLOG_ACTION_CONSOLE_LEVEL 8 | |
58 | /* Return number of unread characters in the log buffer */ | |
59 | #define SYSLOG_ACTION_SIZE_UNREAD 9 | |
60 | /* Return size of the log buffer */ | |
61 | #define SYSLOG_ACTION_SIZE_BUFFER 10 | |
62 | ||
5aaee63c | 63 | /* |
f4bc7f96 | 64 | * Color scheme |
5aaee63c | 65 | */ |
f4bc7f96 KZ |
66 | struct dmesg_color { |
67 | const char *scheme; /* name used in termina-colors.d/dmesg.scheme */ | |
68 | const char *dflt; /* default color ESC sequence */ | |
69 | }; | |
70 | ||
71 | enum { | |
72 | DMESG_COLOR_SUBSYS, | |
73 | DMESG_COLOR_TIME, | |
33ecab2b | 74 | DMESG_COLOR_TIMEBREAK, |
f4bc7f96 KZ |
75 | DMESG_COLOR_ALERT, |
76 | DMESG_COLOR_CRIT, | |
77 | DMESG_COLOR_ERR, | |
78 | DMESG_COLOR_WARN, | |
79 | DMESG_COLOR_SEGFAULT | |
80 | }; | |
81 | ||
82 | static const struct dmesg_color colors[] = | |
83 | { | |
84 | [DMESG_COLOR_SUBSYS] = { "subsys", UL_COLOR_BROWN }, | |
85 | [DMESG_COLOR_TIME] = { "time", UL_COLOR_GREEN }, | |
33ecab2b | 86 | [DMESG_COLOR_TIMEBREAK] = { "timebreak",UL_COLOR_GREEN UL_COLOR_BOLD }, |
f4bc7f96 KZ |
87 | [DMESG_COLOR_ALERT] = { "alert", UL_COLOR_REVERSE UL_COLOR_RED }, |
88 | [DMESG_COLOR_CRIT] = { "crit", UL_COLOR_BOLD UL_COLOR_RED }, | |
89 | [DMESG_COLOR_ERR] = { "err", UL_COLOR_RED }, | |
90 | [DMESG_COLOR_WARN] = { "warn", UL_COLOR_BOLD }, | |
91 | [DMESG_COLOR_SEGFAULT] = { "segfault", UL_COLOR_HALFBRIGHT UL_COLOR_RED } | |
92 | }; | |
93 | ||
94 | #define dmesg_enable_color(_id) \ | |
95 | color_scheme_enable(colors[_id].scheme, colors[_id].dflt); | |
5aaee63c | 96 | |
f06ec64f | 97 | /* |
5ef05369 | 98 | * Priority and facility names |
f06ec64f KZ |
99 | */ |
100 | struct dmesg_name { | |
101 | const char *name; | |
102 | const char *help; | |
103 | }; | |
104 | ||
5ef05369 KZ |
105 | /* |
106 | * Priority names -- based on sys/syslog.h | |
107 | */ | |
f06ec64f KZ |
108 | static const struct dmesg_name level_names[] = |
109 | { | |
110 | [LOG_EMERG] = { "emerg", N_("system is unusable") }, | |
111 | [LOG_ALERT] = { "alert", N_("action must be taken immediately") }, | |
112 | [LOG_CRIT] = { "crit", N_("critical conditions") }, | |
113 | [LOG_ERR] = { "err", N_("error conditions") }, | |
114 | [LOG_WARNING] = { "warn", N_("warning conditions") }, | |
115 | [LOG_NOTICE] = { "notice",N_("normal but significant condition") }, | |
116 | [LOG_INFO] = { "info", N_("informational") }, | |
117 | [LOG_DEBUG] = { "debug", N_("debug-level messages") } | |
118 | }; | |
119 | ||
85f3cc55 KZ |
120 | /* |
121 | * sys/syslog.h uses (f << 3) for all facility codes. | |
9e930041 | 122 | * We want to use the codes as array indexes, so shift back... |
85f3cc55 KZ |
123 | * |
124 | * Note that libc LOG_FAC() macro returns the base codes, not the | |
125 | * shifted code :-) | |
126 | */ | |
127 | #define FAC_BASE(f) ((f) >> 3) | |
128 | ||
129 | static const struct dmesg_name facility_names[] = | |
130 | { | |
131 | [FAC_BASE(LOG_KERN)] = { "kern", N_("kernel messages") }, | |
132 | [FAC_BASE(LOG_USER)] = { "user", N_("random user-level messages") }, | |
133 | [FAC_BASE(LOG_MAIL)] = { "mail", N_("mail system") }, | |
134 | [FAC_BASE(LOG_DAEMON)] = { "daemon", N_("system daemons") }, | |
135 | [FAC_BASE(LOG_AUTH)] = { "auth", N_("security/authorization messages") }, | |
136 | [FAC_BASE(LOG_SYSLOG)] = { "syslog", N_("messages generated internally by syslogd") }, | |
137 | [FAC_BASE(LOG_LPR)] = { "lpr", N_("line printer subsystem") }, | |
138 | [FAC_BASE(LOG_NEWS)] = { "news", N_("network news subsystem") }, | |
139 | [FAC_BASE(LOG_UUCP)] = { "uucp", N_("UUCP subsystem") }, | |
140 | [FAC_BASE(LOG_CRON)] = { "cron", N_("clock daemon") }, | |
141 | [FAC_BASE(LOG_AUTHPRIV)] = { "authpriv", N_("security/authorization messages (private)") }, | |
4df28845 | 142 | [FAC_BASE(LOG_FTP)] = { "ftp", N_("FTP daemon") }, |
85f3cc55 KZ |
143 | }; |
144 | ||
e6471b9f KZ |
145 | /* supported methods to read message buffer |
146 | */ | |
147 | enum { | |
7af23060 | 148 | DMESG_METHOD_KMSG, /* read messages from /dev/kmsg (default) */ |
e6471b9f KZ |
149 | DMESG_METHOD_SYSLOG, /* klogctl() buffer */ |
150 | DMESG_METHOD_MMAP /* mmap file with records (see --file) */ | |
151 | }; | |
152 | ||
776eabe7 SK |
153 | enum { |
154 | DMESG_TIMEFTM_NONE = 0, | |
155 | DMESG_TIMEFTM_CTIME, /* [ctime] */ | |
156 | DMESG_TIMEFTM_CTIME_DELTA, /* [ctime <delta>] */ | |
157 | DMESG_TIMEFTM_DELTA, /* [<delta>] */ | |
158 | DMESG_TIMEFTM_RELTIME, /* [relative] */ | |
159 | DMESG_TIMEFTM_TIME, /* [time] */ | |
8a8be309 SK |
160 | DMESG_TIMEFTM_TIME_DELTA, /* [time <delta>] */ |
161 | DMESG_TIMEFTM_ISO8601 /* 2013-06-13T22:11:00,123456+0100 */ | |
776eabe7 | 162 | }; |
15a1e371 | 163 | #define is_timefmt(c, f) ((c)->time_fmt == (DMESG_TIMEFTM_ ##f)) |
776eabe7 | 164 | |
aca1633a KZ |
165 | struct dmesg_control { |
166 | /* bit arrays -- see include/bitops.h */ | |
167 | char levels[ARRAY_SIZE(level_names) / NBBY + 1]; | |
168 | char facilities[ARRAY_SIZE(facility_names) / NBBY + 1]; | |
169 | ||
bd304d92 | 170 | struct timeval lasttime; /* last printed timestamp */ |
60464b1f | 171 | struct tm lasttm; /* last localtime */ |
3c5384d0 | 172 | struct timeval boot_time; /* system boot time */ |
bd304d92 | 173 | |
e6471b9f KZ |
174 | int action; /* SYSLOG_ACTION_* */ |
175 | int method; /* DMESG_METHOD_* */ | |
298a073c KZ |
176 | |
177 | size_t bufsize; /* size of syslog buffer */ | |
178 | ||
7af23060 | 179 | int kmsg; /* /dev/kmsg file descriptor */ |
298a073c KZ |
180 | ssize_t kmsg_first_read;/* initial read() return code */ |
181 | char kmsg_buf[BUFSIZ];/* buffer to read kmsg data */ | |
22eb2f01 VM |
182 | char kmsg_saved[BUFSIZ];/* buffer to save line after fragment */ |
183 | ssize_t kmsg_saved_size; /* if nonzero, read from kmsg_saved */ | |
e6471b9f | 184 | |
c672220f KZ |
185 | /* |
186 | * For the --file option we mmap whole file. The unnecessary (already | |
187 | * printed) pages are always unmapped. The result is that we have in | |
455fe9a0 | 188 | * memory only the currently used page(s). |
c672220f | 189 | */ |
9b3a6984 | 190 | char *filename; |
c672220f KZ |
191 | char *mmap_buff; |
192 | size_t pagesize; | |
776eabe7 | 193 | unsigned int time_fmt; /* time format */ |
c672220f | 194 | |
0fd12a96 KZ |
195 | unsigned int follow:1, /* wait for new messages */ |
196 | raw:1, /* raw mode */ | |
9feec79c KZ |
197 | fltr_lev:1, /* filter out by levels[] */ |
198 | fltr_fac:1, /* filter out by facilities[] */ | |
199 | decode:1, /* use "facility: level: " prefix */ | |
aa192520 | 200 | pager:1, /* pipe output into a pager */ |
098ce273 | 201 | color:1; /* colorize messages */ |
b45c3da2 | 202 | int indent; /* due to timestamps if newline */ |
aca1633a | 203 | }; |
f4fa5b44 | 204 | |
a7ee94f2 KZ |
205 | struct dmesg_record { |
206 | const char *mesg; | |
207 | size_t mesg_size; | |
208 | ||
209 | int level; | |
210 | int facility; | |
bd304d92 | 211 | struct timeval tv; |
22eb2f01 | 212 | char flags; |
a7ee94f2 KZ |
213 | |
214 | const char *next; /* buffer with next unparsed record */ | |
215 | size_t next_size; /* size of the next buffer */ | |
216 | }; | |
217 | ||
ddca870a KZ |
218 | #define INIT_DMESG_RECORD(_r) do { \ |
219 | (_r)->mesg = NULL; \ | |
220 | (_r)->mesg_size = 0; \ | |
221 | (_r)->facility = -1; \ | |
222 | (_r)->level = -1; \ | |
223 | (_r)->tv.tv_sec = 0; \ | |
224 | (_r)->tv.tv_usec = 0; \ | |
225 | } while (0) | |
226 | ||
227 | static int read_kmsg(struct dmesg_control *ctl); | |
228 | ||
22eb2f01 VM |
229 | |
230 | static int parse_kmsg_record(struct dmesg_control *ctl, | |
231 | struct dmesg_record *rec, | |
232 | char *buf, | |
233 | size_t sz); | |
234 | ||
235 | ||
5aaee63c | 236 | static int set_level_color(int log_level, const char *mesg, size_t mesgsz) |
098ce273 | 237 | { |
f4bc7f96 KZ |
238 | int id = -1; |
239 | ||
098ce273 OO |
240 | switch (log_level) { |
241 | case LOG_ALERT: | |
f4bc7f96 KZ |
242 | id = DMESG_COLOR_ALERT; |
243 | break; | |
098ce273 | 244 | case LOG_CRIT: |
f4bc7f96 KZ |
245 | id = DMESG_COLOR_CRIT; |
246 | break; | |
098ce273 | 247 | case LOG_ERR: |
f4bc7f96 KZ |
248 | id = DMESG_COLOR_ERR; |
249 | break; | |
5aaee63c | 250 | case LOG_WARNING: |
f4bc7f96 KZ |
251 | id = DMESG_COLOR_WARN; |
252 | break; | |
098ce273 OO |
253 | default: |
254 | break; | |
255 | } | |
256 | ||
9e930041 | 257 | /* well, sometimes the messages contains important keywords, but in |
5aaee63c KZ |
258 | * non-warning/error messages |
259 | */ | |
f4bc7f96 KZ |
260 | if (id < 0 && memmem(mesg, mesgsz, "segfault at", 11)) |
261 | id = DMESG_COLOR_SEGFAULT; | |
5aaee63c | 262 | |
f4bc7f96 KZ |
263 | if (id >= 0) |
264 | dmesg_enable_color(id); | |
265 | ||
266 | return id >= 0 ? 0 : -1; | |
098ce273 | 267 | } |
ddca870a | 268 | |
6e1eda6f | 269 | static void __attribute__((__noreturn__)) usage(void) |
15103c4b | 270 | { |
6e1eda6f | 271 | FILE *out = stdout; |
738767b9 | 272 | size_t i; |
f06ec64f | 273 | |
fbbc4c88 SK |
274 | fputs(USAGE_HEADER, out); |
275 | fprintf(out, _(" %s [options]\n"), program_invocation_short_name); | |
451dbcfa BS |
276 | |
277 | fputs(USAGE_SEPARATOR, out); | |
278 | fputs(_("Display or control the kernel ring buffer.\n"), out); | |
279 | ||
fbbc4c88 SK |
280 | fputs(USAGE_OPTIONS, out); |
281 | fputs(_(" -C, --clear clear the kernel ring buffer\n"), out); | |
282 | fputs(_(" -c, --read-clear read and clear all messages\n"), out); | |
283 | fputs(_(" -D, --console-off disable printing messages to console\n"), out); | |
fbbc4c88 SK |
284 | fputs(_(" -E, --console-on enable printing messages to console\n"), out); |
285 | fputs(_(" -F, --file <file> use the file instead of the kernel log buffer\n"), out); | |
286 | fputs(_(" -f, --facility <list> restrict output to defined facilities\n"), out); | |
f0a3a1ca | 287 | fputs(_(" -H, --human human readable output\n"), out); |
fbbc4c88 | 288 | fputs(_(" -k, --kernel display kernel messages\n"), out); |
9bc2b51a | 289 | fputs(_(" -L, --color[=<when>] colorize messages (auto, always or never)\n"), out); |
5d51dc2a KZ |
290 | fprintf(out, |
291 | " %s\n", USAGE_COLORS_DEFAULT); | |
fbbc4c88 SK |
292 | fputs(_(" -l, --level <list> restrict output to defined levels\n"), out); |
293 | fputs(_(" -n, --console-level <level> set level of messages printed to console\n"), out); | |
aa192520 | 294 | fputs(_(" -P, --nopager do not pipe output into a pager\n"), out); |
fbbc4c88 SK |
295 | fputs(_(" -r, --raw print the raw message buffer\n"), out); |
296 | fputs(_(" -S, --syslog force to use syslog(2) rather than /dev/kmsg\n"), out); | |
297 | fputs(_(" -s, --buffer-size <size> buffer size to query the kernel ring buffer\n"), out); | |
fbbc4c88 SK |
298 | fputs(_(" -u, --userspace display userspace messages\n"), out); |
299 | fputs(_(" -w, --follow wait for new messages\n"), out); | |
300 | fputs(_(" -x, --decode decode facility and level to readable string\n"), out); | |
06dd56f9 SK |
301 | fputs(_(" -d, --show-delta show time delta between printed messages\n"), out); |
302 | fputs(_(" -e, --reltime show local time and time delta in readable format\n"), out); | |
0825fe16 BS |
303 | fputs(_(" -T, --ctime show human-readable timestamp (may be inaccurate!)\n"), out); |
304 | fputs(_(" -t, --notime don't show any timestamp with messages\n"), out); | |
305 | fputs(_(" --time-format <format> show timestamp using the given format:\n" | |
06dd56f9 SK |
306 | " [delta|reltime|ctime|notime|iso]\n" |
307 | "Suspending/resume will make ctime and iso timestamps inaccurate.\n"), out); | |
fbbc4c88 | 308 | fputs(USAGE_SEPARATOR, out); |
f45f3ec3 | 309 | printf(USAGE_HELP_OPTIONS(29)); |
dcd16b0f | 310 | fputs(_("\nSupported log facilities:\n"), out); |
fbbc4c88 | 311 | for (i = 0; i < ARRAY_SIZE(level_names); i++) |
963ac507 | 312 | fprintf(out, " %7s - %s\n", |
fbbc4c88 SK |
313 | facility_names[i].name, |
314 | _(facility_names[i].help)); | |
85f3cc55 | 315 | |
dcd16b0f | 316 | fputs(_("\nSupported log levels (priorities):\n"), out); |
fbbc4c88 | 317 | for (i = 0; i < ARRAY_SIZE(level_names); i++) |
963ac507 | 318 | fprintf(out, " %7s - %s\n", |
fbbc4c88 SK |
319 | level_names[i].name, |
320 | _(level_names[i].help)); | |
b3054454 | 321 | |
f45f3ec3 | 322 | printf(USAGE_MAN_TAIL("dmesg(1)")); |
6e1eda6f | 323 | exit(EXIT_SUCCESS); |
6dbe3af9 KZ |
324 | } |
325 | ||
5ef05369 KZ |
326 | /* |
327 | * LEVEL ::= <number> | <name> | |
8c8fa302 BM |
328 | * <number> ::= @len is set: number in range <0..N>, where N < ARRAY_SIZE(level_names) |
329 | * ::= @len not set: number in range <1..N>, where N <= ARRAY_SIZE(level_names) | |
5ef05369 | 330 | * <name> ::= case-insensitive text |
8c8fa302 BM |
331 | * |
332 | * Note that @len argument is not set when parsing "-n <level>" command line | |
9e930041 | 333 | * option. The console_level is interpreted as "log level less than the value". |
8c8fa302 BM |
334 | * |
335 | * For example "dmesg -n 8" or "dmesg -n debug" enables debug console log | |
336 | * level by klogctl(SYSLOG_ACTION_CONSOLE_LEVEL, NULL, 8). The @str argument | |
337 | * has to be parsed to number in range <1..8>. | |
5ef05369 | 338 | */ |
5c8f6bc6 | 339 | static int parse_level(const char *str, size_t len) |
f06ec64f | 340 | { |
8c8fa302 BM |
341 | int offset = 0; |
342 | ||
5c8f6bc6 | 343 | if (!str) |
f06ec64f | 344 | return -1; |
8c8fa302 | 345 | if (!len) { |
5c8f6bc6 | 346 | len = strlen(str); |
8c8fa302 BM |
347 | offset = 1; |
348 | } | |
5c8f6bc6 | 349 | errno = 0; |
f06ec64f | 350 | |
5c8f6bc6 KZ |
351 | if (isdigit(*str)) { |
352 | char *end = NULL; | |
8c8fa302 | 353 | long x = strtol(str, &end, 10) - offset; |
5c8f6bc6 | 354 | |
738767b9 KZ |
355 | if (!errno && end && end > str && (size_t) (end - str) == len && |
356 | x >= 0 && (size_t) x < ARRAY_SIZE(level_names)) | |
8c8fa302 | 357 | return x + offset; |
5c8f6bc6 | 358 | } else { |
738767b9 KZ |
359 | size_t i; |
360 | ||
5c8f6bc6 KZ |
361 | for (i = 0; i < ARRAY_SIZE(level_names); i++) { |
362 | const char *n = level_names[i].name; | |
363 | ||
364 | if (strncasecmp(str, n, len) == 0 && *(n + len) == '\0') | |
8c8fa302 | 365 | return i + offset; |
5c8f6bc6 KZ |
366 | } |
367 | } | |
368 | ||
369 | if (errno) | |
370 | err(EXIT_FAILURE, _("failed to parse level '%s'"), str); | |
371 | ||
372 | errx(EXIT_FAILURE, _("unknown level '%s'"), str); | |
f06ec64f KZ |
373 | return -1; |
374 | } | |
375 | ||
5ef05369 KZ |
376 | /* |
377 | * FACILITY ::= <number> | <name> | |
378 | * <number> ::= number in range <0..N>, where N < ARRAY_SIZE(facility_names) | |
379 | * <name> ::= case-insensitive text | |
380 | */ | |
0e24df3b KZ |
381 | static int parse_facility(const char *str, size_t len) |
382 | { | |
0e24df3b KZ |
383 | if (!str) |
384 | return -1; | |
385 | if (!len) | |
386 | len = strlen(str); | |
387 | errno = 0; | |
388 | ||
389 | if (isdigit(*str)) { | |
390 | char *end = NULL; | |
738767b9 | 391 | long x = strtol(str, &end, 10); |
0e24df3b | 392 | |
738767b9 KZ |
393 | if (!errno && end && end > str && (size_t) (end - str) == len && |
394 | x >= 0 && (size_t) x < ARRAY_SIZE(facility_names)) | |
395 | return x; | |
0e24df3b | 396 | } else { |
738767b9 KZ |
397 | size_t i; |
398 | ||
0e24df3b KZ |
399 | for (i = 0; i < ARRAY_SIZE(facility_names); i++) { |
400 | const char *n = facility_names[i].name; | |
401 | ||
402 | if (strncasecmp(str, n, len) == 0 && *(n + len) == '\0') | |
403 | return i; | |
404 | } | |
405 | } | |
406 | ||
407 | if (errno) | |
408 | err(EXIT_FAILURE, _("failed to parse facility '%s'"), str); | |
409 | ||
410 | errx(EXIT_FAILURE, _("unknown facility '%s'"), str); | |
411 | return -1; | |
412 | } | |
413 | ||
5ef05369 KZ |
414 | /* |
415 | * Parses numerical prefix used for all messages in kernel ring buffer. | |
416 | * | |
417 | * Priorities/facilities are encoded into a single 32-bit quantity, where the | |
418 | * bottom 3 bits are the priority (0-7) and the top 28 bits are the facility | |
419 | * (0-big number). | |
420 | * | |
ddca870a | 421 | * Note that the number has to end with '>' or ',' char. |
5ef05369 | 422 | */ |
636a6207 KZ |
423 | static const char *parse_faclev(const char *str, int *fac, int *lev) |
424 | { | |
425 | long num; | |
426 | char *end = NULL; | |
427 | ||
428 | if (!str) | |
429 | return str; | |
430 | ||
431 | errno = 0; | |
432 | num = strtol(str, &end, 10); | |
433 | ||
434 | if (!errno && end && end > str) { | |
435 | *fac = LOG_FAC(num); | |
436 | *lev = LOG_PRI(num); | |
85f3cc55 | 437 | |
738767b9 | 438 | if (*lev < 0 || (size_t) *lev > ARRAY_SIZE(level_names)) |
85f3cc55 | 439 | *lev = -1; |
738767b9 | 440 | if (*fac < 0 || (size_t) *fac > ARRAY_SIZE(facility_names)) |
85f3cc55 | 441 | *fac = -1; |
ddca870a | 442 | return end + 1; /* skip '<' or ',' */ |
636a6207 KZ |
443 | } |
444 | ||
445 | return str; | |
446 | } | |
447 | ||
ddca870a KZ |
448 | /* |
449 | * Parses timestamp from syslog message prefix, expected format: | |
450 | * | |
451 | * seconds.microseconds] | |
452 | * | |
453 | * the ']' is the timestamp field terminator. | |
454 | */ | |
455 | static const char *parse_syslog_timestamp(const char *str0, struct timeval *tv) | |
bd304d92 KZ |
456 | { |
457 | const char *str = str0; | |
458 | char *end = NULL; | |
459 | ||
460 | if (!str0) | |
461 | return str0; | |
462 | ||
463 | errno = 0; | |
464 | tv->tv_sec = strtol(str, &end, 10); | |
465 | ||
466 | if (!errno && end && *end == '.' && *(end + 1)) { | |
467 | str = end + 1; | |
468 | end = NULL; | |
469 | tv->tv_usec = strtol(str, &end, 10); | |
470 | } | |
471 | if (errno || !end || end == str || *end != ']') | |
472 | return str0; | |
473 | ||
474 | return end + 1; /* skip ']' */ | |
475 | } | |
476 | ||
ddca870a KZ |
477 | /* |
478 | * Parses timestamp from /dev/kmsg, expected formats: | |
479 | * | |
480 | * microseconds, | |
481 | * microseconds; | |
482 | * | |
483 | * the ',' is fields separators and ';' items terminator (for the last item) | |
484 | */ | |
485 | static const char *parse_kmsg_timestamp(const char *str0, struct timeval *tv) | |
486 | { | |
487 | const char *str = str0; | |
488 | char *end = NULL; | |
489 | uint64_t usec; | |
490 | ||
491 | if (!str0) | |
492 | return str0; | |
493 | ||
494 | errno = 0; | |
495 | usec = strtoumax(str, &end, 10); | |
496 | ||
497 | if (!errno && end && (*end == ';' || *end == ',')) { | |
498 | tv->tv_usec = usec % 1000000; | |
499 | tv->tv_sec = usec / 1000000; | |
500 | } else | |
501 | return str0; | |
502 | ||
503 | return end + 1; /* skip separator */ | |
504 | } | |
505 | ||
bd304d92 KZ |
506 | |
507 | static double time_diff(struct timeval *a, struct timeval *b) | |
508 | { | |
509 | return (a->tv_sec - b->tv_sec) + (a->tv_usec - b->tv_usec) / 1E6; | |
510 | } | |
511 | ||
7ff1f63f | 512 | static int get_syslog_buffer_size(void) |
eed99b2a KZ |
513 | { |
514 | int n = klogctl(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0); | |
515 | ||
516 | return n > 0 ? n : 0; | |
517 | } | |
518 | ||
c672220f | 519 | /* |
7ff1f63f | 520 | * Reads messages from regular file by mmap |
c672220f | 521 | */ |
7ff1f63f | 522 | static ssize_t mmap_file_buffer(struct dmesg_control *ctl, char **buf) |
c672220f KZ |
523 | { |
524 | struct stat st; | |
9b3a6984 | 525 | int fd; |
c672220f | 526 | |
9b3a6984 KZ |
527 | if (!ctl->filename) |
528 | return -1; | |
529 | ||
530 | fd = open(ctl->filename, O_RDONLY); | |
c672220f | 531 | if (fd < 0) |
9b3a6984 | 532 | err(EXIT_FAILURE, _("cannot open %s"), ctl->filename); |
c672220f | 533 | if (fstat(fd, &st)) |
fc14ceba | 534 | err(EXIT_FAILURE, _("stat of %s failed"), ctl->filename); |
c672220f KZ |
535 | |
536 | *buf = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0); | |
537 | if (*buf == MAP_FAILED) | |
9b3a6984 | 538 | err(EXIT_FAILURE, _("cannot mmap: %s"), ctl->filename); |
c672220f KZ |
539 | ctl->mmap_buff = *buf; |
540 | ctl->pagesize = getpagesize(); | |
541 | close(fd); | |
542 | ||
543 | return st.st_size; | |
544 | } | |
545 | ||
5ef05369 | 546 | /* |
7ff1f63f | 547 | * Reads messages from kernel ring buffer by klogctl() |
5ef05369 | 548 | */ |
7ff1f63f | 549 | static ssize_t read_syslog_buffer(struct dmesg_control *ctl, char **buf) |
65e3eed9 KZ |
550 | { |
551 | size_t sz; | |
552 | int rc = -1; | |
65e3eed9 | 553 | |
e6471b9f KZ |
554 | if (ctl->bufsize) { |
555 | sz = ctl->bufsize + 8; | |
65e3eed9 | 556 | *buf = xmalloc(sz * sizeof(char)); |
e6471b9f | 557 | rc = klogctl(ctl->action, *buf, sz); |
65e3eed9 KZ |
558 | } else { |
559 | sz = 16392; | |
560 | while (1) { | |
561 | *buf = xmalloc(sz * sizeof(char)); | |
562 | rc = klogctl(SYSLOG_ACTION_READ_ALL, *buf, sz); | |
738767b9 KZ |
563 | if (rc < 0) |
564 | break; | |
565 | if ((size_t) rc != sz || sz > (1 << 28)) | |
65e3eed9 KZ |
566 | break; |
567 | free(*buf); | |
568 | *buf = NULL; | |
569 | sz *= 4; | |
570 | } | |
571 | ||
e6471b9f | 572 | if (rc > 0 && ctl->action == SYSLOG_ACTION_READ_CLEAR) |
65e3eed9 KZ |
573 | rc = klogctl(SYSLOG_ACTION_READ_CLEAR, *buf, sz); |
574 | } | |
575 | ||
576 | return rc; | |
577 | } | |
578 | ||
7ff1f63f KZ |
579 | /* |
580 | * Top level function to read messages | |
581 | */ | |
e6471b9f KZ |
582 | static ssize_t read_buffer(struct dmesg_control *ctl, char **buf) |
583 | { | |
584 | ssize_t n = -1; | |
585 | ||
586 | switch (ctl->method) { | |
587 | case DMESG_METHOD_MMAP: | |
7ff1f63f | 588 | n = mmap_file_buffer(ctl, buf); |
e6471b9f KZ |
589 | break; |
590 | case DMESG_METHOD_SYSLOG: | |
591 | if (!ctl->bufsize) | |
7ff1f63f | 592 | ctl->bufsize = get_syslog_buffer_size(); |
e6471b9f | 593 | |
7ff1f63f | 594 | n = read_syslog_buffer(ctl, buf); |
e6471b9f | 595 | break; |
ddca870a KZ |
596 | case DMESG_METHOD_KMSG: |
597 | /* | |
598 | * Since kernel 3.5.0 | |
599 | */ | |
600 | n = read_kmsg(ctl); | |
c677ffba KZ |
601 | if (n == 0 && ctl->action == SYSLOG_ACTION_READ_CLEAR) |
602 | n = klogctl(SYSLOG_ACTION_CLEAR, NULL, 0); | |
ddca870a | 603 | break; |
f6f1356f SK |
604 | default: |
605 | abort(); /* impossible method -> drop core */ | |
e6471b9f KZ |
606 | } |
607 | ||
608 | return n; | |
609 | } | |
610 | ||
b8300c0a KZ |
611 | static int fwrite_hex(const char *buf, size_t size, FILE *out) |
612 | { | |
738767b9 | 613 | size_t i; |
b8300c0a KZ |
614 | |
615 | for (i = 0; i < size; i++) { | |
2e45524d | 616 | int rc = fprintf(out, "\\x%02hhx", buf[i]); |
b8300c0a KZ |
617 | if (rc < 0) |
618 | return rc; | |
619 | } | |
620 | return 0; | |
621 | } | |
622 | ||
5ef05369 KZ |
623 | /* |
624 | * Prints to 'out' and non-printable chars are replaced with \x<hex> sequences. | |
625 | */ | |
b45c3da2 | 626 | static void safe_fwrite(const char *buf, size_t size, int indent, FILE *out) |
b8300c0a | 627 | { |
738767b9 | 628 | size_t i; |
b8300c0a KZ |
629 | #ifdef HAVE_WIDECHAR |
630 | mbstate_t s; | |
631 | memset(&s, 0, sizeof (s)); | |
632 | #endif | |
633 | for (i = 0; i < size; i++) { | |
634 | const char *p = buf + i; | |
635 | int rc, hex = 0; | |
d9bdd89d | 636 | size_t len; |
b8300c0a KZ |
637 | |
638 | #ifdef HAVE_WIDECHAR | |
639 | wchar_t wc; | |
0720766e | 640 | len = mbrtowc(&wc, p, size - i, &s); |
b8300c0a KZ |
641 | |
642 | if (len == 0) /* L'\0' */ | |
643 | return; | |
644 | ||
730d5e77 | 645 | if (len == (size_t)-1 || len == (size_t)-2) { /* invalid sequence */ |
b8300c0a KZ |
646 | memset(&s, 0, sizeof (s)); |
647 | len = hex = 1; | |
b8300c0a KZ |
648 | } else if (len > 1 && !iswprint(wc)) { /* non-printable multibyte */ |
649 | hex = 1; | |
b8300c0a | 650 | } |
0720766e PU |
651 | i += len - 1; |
652 | #else | |
d9bdd89d | 653 | len = 1; |
bae57b5a KZ |
654 | if (!isprint((unsigned char) *p) && |
655 | !isspace((unsigned char) *p)) /* non-printable */ | |
0720766e PU |
656 | hex = 1; |
657 | #endif | |
b8300c0a KZ |
658 | if (hex) |
659 | rc = fwrite_hex(p, len, out); | |
b45c3da2 | 660 | else if (*p == '\n' && *(p + 1) && indent) { |
f1300e2c SK |
661 | rc = fwrite(p, 1, len, out) != len; |
662 | if (fprintf(out, "%*s", indent, "") != indent) | |
663 | rc |= 1; | |
b45c3da2 | 664 | } |
b8300c0a | 665 | else |
85f3cc55 | 666 | rc = fwrite(p, 1, len, out) != len; |
97c32789 KZ |
667 | if (rc != 0) { |
668 | if (errno != EPIPE) | |
669 | err(EXIT_FAILURE, _("write failed")); | |
670 | exit(EXIT_SUCCESS); | |
671 | } | |
b8300c0a KZ |
672 | } |
673 | } | |
674 | ||
ddca870a KZ |
675 | static const char *skip_item(const char *begin, const char *end, const char *sep) |
676 | { | |
677 | while (begin < end) { | |
678 | int c = *begin++; | |
679 | ||
680 | if (c == '\0' || strchr(sep, c)) | |
681 | break; | |
682 | } | |
683 | ||
684 | return begin; | |
685 | } | |
686 | ||
60464b1f KZ |
687 | /* |
688 | * Parses one record from syslog(2) buffer | |
689 | */ | |
7af23060 KZ |
690 | static int get_next_syslog_record(struct dmesg_control *ctl, |
691 | struct dmesg_record *rec) | |
f4fa5b44 | 692 | { |
738767b9 | 693 | size_t i; |
b8300c0a KZ |
694 | const char *begin = NULL; |
695 | ||
7af23060 KZ |
696 | if (ctl->method != DMESG_METHOD_MMAP && |
697 | ctl->method != DMESG_METHOD_SYSLOG) | |
698 | return -1; | |
699 | ||
a7ee94f2 KZ |
700 | if (!rec->next || !rec->next_size) |
701 | return 1; | |
f4fa5b44 | 702 | |
ddca870a | 703 | INIT_DMESG_RECORD(rec); |
a7ee94f2 | 704 | |
c672220f KZ |
705 | /* |
706 | * Unmap already printed file data from memory | |
707 | */ | |
708 | if (ctl->mmap_buff && (size_t) (rec->next - ctl->mmap_buff) > ctl->pagesize) { | |
709 | void *x = ctl->mmap_buff; | |
710 | ||
711 | ctl->mmap_buff += ctl->pagesize; | |
712 | munmap(x, ctl->pagesize); | |
713 | } | |
714 | ||
a7ee94f2 KZ |
715 | for (i = 0; i < rec->next_size; i++) { |
716 | const char *p = rec->next + i; | |
717 | const char *end = NULL; | |
b8300c0a KZ |
718 | |
719 | if (!begin) | |
720 | begin = p; | |
a7ee94f2 | 721 | if (i + 1 == rec->next_size) { |
b8300c0a | 722 | end = p + 1; |
f4fa5b44 | 723 | i++; |
22f69825 KZ |
724 | } else if (*p == '\n' && *(p + 1) == '<') |
725 | end = p; | |
726 | ||
a7ee94f2 KZ |
727 | if (begin && !*begin) |
728 | begin = NULL; /* zero(s) at the end of the buffer? */ | |
b8300c0a KZ |
729 | if (!begin || !end) |
730 | continue; | |
731 | if (end <= begin) | |
732 | continue; /* error or empty line? */ | |
733 | ||
636a6207 | 734 | if (*begin == '<') { |
bb901317 | 735 | if (ctl->fltr_lev || ctl->fltr_fac || ctl->decode || ctl->color) |
a7ee94f2 KZ |
736 | begin = parse_faclev(begin + 1, &rec->facility, |
737 | &rec->level); | |
ddca870a KZ |
738 | else |
739 | begin = skip_item(begin, end, ">"); | |
b8300c0a KZ |
740 | } |
741 | ||
bd304d92 KZ |
742 | if (*begin == '[' && (*(begin + 1) == ' ' || |
743 | isdigit(*(begin + 1)))) { | |
776eabe7 SK |
744 | |
745 | if (!is_timefmt(ctl, NONE)) | |
ddca870a | 746 | begin = parse_syslog_timestamp(begin + 1, &rec->tv); |
776eabe7 | 747 | else |
ddca870a KZ |
748 | begin = skip_item(begin, end, "]"); |
749 | ||
31c9099a KZ |
750 | if (begin < end && *begin == ' ') |
751 | begin++; | |
a7ee94f2 | 752 | } |
d74b8dfc | 753 | |
a7ee94f2 KZ |
754 | rec->mesg = begin; |
755 | rec->mesg_size = end - begin; | |
b8300c0a | 756 | |
a7ee94f2 KZ |
757 | rec->next_size -= end - rec->next; |
758 | rec->next = rec->next_size > 0 ? end + 1 : NULL; | |
59202950 PU |
759 | if (rec->next_size > 0) |
760 | rec->next_size--; | |
a7ee94f2 KZ |
761 | |
762 | return 0; | |
763 | } | |
764 | ||
765 | return 1; | |
766 | } | |
767 | ||
768 | static int accept_record(struct dmesg_control *ctl, struct dmesg_record *rec) | |
769 | { | |
770 | if (ctl->fltr_lev && (rec->facility < 0 || | |
771 | !isset(ctl->levels, rec->level))) | |
772 | return 0; | |
773 | ||
774 | if (ctl->fltr_fac && (rec->facility < 0 || | |
775 | !isset(ctl->facilities, rec->facility))) | |
776 | return 0; | |
777 | ||
778 | return 1; | |
779 | } | |
780 | ||
7ff1f63f | 781 | static void raw_print(struct dmesg_control *ctl, const char *buf, size_t size) |
c672220f KZ |
782 | { |
783 | int lastc = '\n'; | |
784 | ||
785 | if (!ctl->mmap_buff) { | |
786 | /* | |
787 | * Print whole ring buffer | |
788 | */ | |
b45c3da2 | 789 | safe_fwrite(buf, size, 0, stdout); |
c672220f KZ |
790 | lastc = buf[size - 1]; |
791 | } else { | |
792 | /* | |
793 | * Print file in small chunks to save memory | |
794 | */ | |
795 | while (size) { | |
796 | size_t sz = size > ctl->pagesize ? ctl->pagesize : size; | |
797 | char *x = ctl->mmap_buff; | |
798 | ||
b45c3da2 | 799 | safe_fwrite(x, sz, 0, stdout); |
c672220f KZ |
800 | lastc = x[sz - 1]; |
801 | size -= sz; | |
802 | ctl->mmap_buff += sz; | |
803 | munmap(x, sz); | |
804 | } | |
805 | } | |
806 | ||
807 | if (lastc != '\n') | |
808 | putchar('\n'); | |
809 | } | |
810 | ||
60464b1f KZ |
811 | static struct tm *record_localtime(struct dmesg_control *ctl, |
812 | struct dmesg_record *rec, | |
813 | struct tm *tm) | |
814 | { | |
3c5384d0 | 815 | time_t t = ctl->boot_time.tv_sec + rec->tv.tv_sec; |
60464b1f KZ |
816 | return localtime_r(&t, tm); |
817 | } | |
818 | ||
0d1b3300 KZ |
819 | static char *record_ctime(struct dmesg_control *ctl, |
820 | struct dmesg_record *rec, | |
821 | char *buf, size_t bufsiz) | |
822 | { | |
60464b1f | 823 | struct tm tm; |
0d1b3300 | 824 | |
60464b1f | 825 | record_localtime(ctl, rec, &tm); |
0d1b3300 | 826 | |
60464b1f | 827 | if (strftime(buf, bufsiz, "%a %b %e %H:%M:%S %Y", &tm) == 0) |
0d1b3300 KZ |
828 | *buf = '\0'; |
829 | return buf; | |
830 | } | |
831 | ||
60464b1f KZ |
832 | static char *short_ctime(struct tm *tm, char *buf, size_t bufsiz) |
833 | { | |
834 | if (strftime(buf, bufsiz, "%b%e %H:%M", tm) == 0) | |
835 | *buf = '\0'; | |
836 | return buf; | |
837 | } | |
838 | ||
8a8be309 | 839 | static char *iso_8601_time(struct dmesg_control *ctl, struct dmesg_record *rec, |
3c6e7c54 | 840 | char *buf, size_t bufsz) |
8a8be309 | 841 | { |
3c6e7c54 KZ |
842 | struct timeval tv = { |
843 | .tv_sec = ctl->boot_time.tv_sec + rec->tv.tv_sec, | |
844 | .tv_usec = rec->tv.tv_usec | |
845 | }; | |
846 | ||
847 | if (strtimeval_iso(&tv, ISO_8601_DATE|ISO_8601_TIME|ISO_8601_COMMAUSEC| | |
848 | ISO_8601_TIMEZONE, | |
849 | buf, bufsz) != 0) | |
850 | return NULL; | |
851 | ||
8a8be309 SK |
852 | return buf; |
853 | } | |
854 | ||
60464b1f KZ |
855 | static double record_count_delta(struct dmesg_control *ctl, |
856 | struct dmesg_record *rec) | |
857 | { | |
858 | double delta = 0; | |
859 | ||
860 | if (timerisset(&ctl->lasttime)) | |
861 | delta = time_diff(&rec->tv, &ctl->lasttime); | |
862 | ||
863 | ctl->lasttime = rec->tv; | |
864 | return delta; | |
865 | } | |
866 | ||
5aaee63c KZ |
867 | static const char *get_subsys_delimiter(const char *mesg, size_t mesg_size) |
868 | { | |
869 | const char *p = mesg; | |
870 | size_t sz = mesg_size; | |
871 | ||
872 | while (sz > 0) { | |
873 | const char *d = strnchr(p, sz, ':'); | |
874 | if (!d) | |
875 | return NULL; | |
876 | sz -= d - p; | |
877 | if (sz) { | |
878 | if (isblank(*(d + 1))) | |
879 | return d; | |
880 | p = d + 1; | |
881 | } | |
882 | } | |
883 | return NULL; | |
884 | } | |
885 | ||
60464b1f KZ |
886 | static void print_record(struct dmesg_control *ctl, |
887 | struct dmesg_record *rec) | |
7af23060 | 888 | { |
0d1b3300 | 889 | char buf[256]; |
098ce273 | 890 | int has_color = 0; |
5aaee63c KZ |
891 | const char *mesg; |
892 | size_t mesg_size; | |
b45c3da2 | 893 | int indent = 0; |
7af23060 KZ |
894 | |
895 | if (!accept_record(ctl, rec)) | |
896 | return; | |
897 | ||
898 | if (!rec->mesg_size) { | |
899 | putchar('\n'); | |
900 | return; | |
901 | } | |
902 | ||
0d1b3300 KZ |
903 | /* |
904 | * compose syslog(2) compatible raw output -- used for /dev/kmsg for | |
905 | * backward compatibility with syslog(2) buffers only | |
906 | */ | |
37b04d6c | 907 | if (ctl->raw) { |
c2114018 | 908 | ctl->indent = printf("<%d>[%5ld.%06ld] ", |
b45c3da2 | 909 | LOG_MAKEPRI(rec->facility, rec->level), |
c2114018 RM |
910 | (long) rec->tv.tv_sec, |
911 | (long) rec->tv.tv_usec); | |
37b04d6c KZ |
912 | |
913 | goto mesg; | |
914 | } | |
915 | ||
0d1b3300 KZ |
916 | /* |
917 | * facility : priority : | |
918 | */ | |
ae6288da SK |
919 | if (ctl->decode && |
920 | -1 < rec->level && rec->level < (int) ARRAY_SIZE(level_names) && | |
921 | -1 < rec->facility && rec->facility < (int) ARRAY_SIZE(facility_names)) | |
b45c3da2 IB |
922 | indent = printf("%-6s:%-6s: ", facility_names[rec->facility].name, |
923 | level_names[rec->level].name); | |
7af23060 | 924 | |
776eabe7 | 925 | if (ctl->color) |
f4bc7f96 | 926 | dmesg_enable_color(DMESG_COLOR_TIME); |
0d1b3300 | 927 | |
776eabe7 | 928 | switch (ctl->time_fmt) { |
60464b1f KZ |
929 | double delta; |
930 | struct tm cur; | |
776eabe7 | 931 | case DMESG_TIMEFTM_NONE: |
b45c3da2 | 932 | ctl->indent = 0; |
776eabe7 SK |
933 | break; |
934 | case DMESG_TIMEFTM_CTIME: | |
b45c3da2 | 935 | ctl->indent = printf("[%s] ", record_ctime(ctl, rec, buf, sizeof(buf))); |
776eabe7 SK |
936 | break; |
937 | case DMESG_TIMEFTM_CTIME_DELTA: | |
b45c3da2 IB |
938 | ctl->indent = printf("[%s <%12.06f>] ", |
939 | record_ctime(ctl, rec, buf, sizeof(buf)), | |
940 | record_count_delta(ctl, rec)); | |
776eabe7 SK |
941 | break; |
942 | case DMESG_TIMEFTM_DELTA: | |
b45c3da2 | 943 | ctl->indent = printf("[<%12.06f>] ", record_count_delta(ctl, rec)); |
776eabe7 SK |
944 | break; |
945 | case DMESG_TIMEFTM_RELTIME: | |
60464b1f KZ |
946 | record_localtime(ctl, rec, &cur); |
947 | delta = record_count_delta(ctl, rec); | |
776eabe7 | 948 | if (cur.tm_min != ctl->lasttm.tm_min || |
60464b1f | 949 | cur.tm_hour != ctl->lasttm.tm_hour || |
5aaee63c | 950 | cur.tm_yday != ctl->lasttm.tm_yday) { |
33ecab2b | 951 | dmesg_enable_color(DMESG_COLOR_TIMEBREAK); |
b45c3da2 | 952 | ctl->indent = printf("[%s] ", short_ctime(&cur, buf, sizeof(buf))); |
5aaee63c | 953 | } else { |
5aaee63c | 954 | if (delta < 10) |
b45c3da2 | 955 | ctl->indent = printf("[ %+8.06f] ", delta); |
5aaee63c | 956 | else |
b45c3da2 | 957 | ctl->indent = printf("[ %+9.06f] ", delta); |
5aaee63c | 958 | } |
60464b1f | 959 | ctl->lasttm = cur; |
776eabe7 SK |
960 | break; |
961 | case DMESG_TIMEFTM_TIME: | |
c2114018 RM |
962 | ctl->indent = printf("[%5ld.%06ld] ", |
963 | (long)rec->tv.tv_sec, (long)rec->tv.tv_usec); | |
776eabe7 SK |
964 | break; |
965 | case DMESG_TIMEFTM_TIME_DELTA: | |
c2114018 RM |
966 | ctl->indent = printf("[%5ld.%06ld <%12.06f>] ", (long)rec->tv.tv_sec, |
967 | (long)rec->tv.tv_usec, record_count_delta(ctl, rec)); | |
776eabe7 | 968 | break; |
8a8be309 | 969 | case DMESG_TIMEFTM_ISO8601: |
54d17232 | 970 | ctl->indent = printf("%s ", iso_8601_time(ctl, rec, buf, sizeof(buf))); |
8a8be309 | 971 | break; |
776eabe7 SK |
972 | default: |
973 | abort(); | |
60464b1f | 974 | } |
7af23060 | 975 | |
b45c3da2 IB |
976 | ctl->indent += indent; |
977 | ||
776eabe7 SK |
978 | if (ctl->color) |
979 | color_disable(); | |
ddca870a | 980 | |
37b04d6c | 981 | mesg: |
5aaee63c KZ |
982 | mesg = rec->mesg; |
983 | mesg_size = rec->mesg_size; | |
984 | ||
985 | /* Colorize output */ | |
986 | if (ctl->color) { | |
987 | /* subsystem prefix */ | |
988 | const char *subsys = get_subsys_delimiter(mesg, mesg_size); | |
989 | if (subsys) { | |
f4bc7f96 | 990 | dmesg_enable_color(DMESG_COLOR_SUBSYS); |
b45c3da2 | 991 | safe_fwrite(mesg, subsys - mesg, ctl->indent, stdout); |
5aaee63c KZ |
992 | color_disable(); |
993 | ||
994 | mesg_size -= subsys - mesg; | |
995 | mesg = subsys; | |
996 | } | |
997 | /* error, alert .. etc. colors */ | |
998 | has_color = set_level_color(rec->level, mesg, mesg_size) == 0; | |
b45c3da2 | 999 | safe_fwrite(mesg, mesg_size, ctl->indent, stdout); |
5aaee63c KZ |
1000 | if (has_color) |
1001 | color_disable(); | |
1002 | } else | |
b45c3da2 | 1003 | safe_fwrite(mesg, mesg_size, ctl->indent, stdout); |
098ce273 | 1004 | |
5aaee63c | 1005 | if (*(mesg + mesg_size - 1) != '\n') |
7af23060 KZ |
1006 | putchar('\n'); |
1007 | } | |
1008 | ||
a7ee94f2 KZ |
1009 | /* |
1010 | * Prints the 'buf' kernel ring buffer; the messages are filtered out according | |
1011 | * to 'levels' and 'facilities' bitarrays. | |
1012 | */ | |
7ff1f63f KZ |
1013 | static void print_buffer(struct dmesg_control *ctl, |
1014 | const char *buf, size_t size) | |
a7ee94f2 KZ |
1015 | { |
1016 | struct dmesg_record rec = { .next = buf, .next_size = size }; | |
1017 | ||
1018 | if (ctl->raw) { | |
7ff1f63f | 1019 | raw_print(ctl, buf, size); |
a7ee94f2 KZ |
1020 | return; |
1021 | } | |
1022 | ||
7af23060 KZ |
1023 | while (get_next_syslog_record(ctl, &rec) == 0) |
1024 | print_record(ctl, &rec); | |
1025 | } | |
a7ee94f2 | 1026 | |
22eb2f01 VM |
1027 | /* |
1028 | * Read one record from kmsg, automatically concatenating message fragments | |
1029 | */ | |
4ceb601d MB |
1030 | static ssize_t read_kmsg_one(struct dmesg_control *ctl) |
1031 | { | |
1032 | ssize_t size; | |
22eb2f01 VM |
1033 | struct dmesg_record rec = { .flags = 0 }; |
1034 | char fragment_buf[BUFSIZ] = { 0 }; | |
1035 | ssize_t fragment_offset = 0; | |
1036 | ||
1037 | if (ctl->kmsg_saved_size != 0) { | |
1038 | size = ctl->kmsg_saved_size; | |
1039 | memcpy(ctl->kmsg_buf, ctl->kmsg_saved, size); | |
1040 | ctl->kmsg_saved_size = 0; | |
1041 | return size; | |
1042 | } | |
4ceb601d | 1043 | |
22eb2f01 VM |
1044 | /* |
1045 | * kmsg returns EPIPE if record was modified while reading. | |
1046 | * Read records until there is one with a flag different from 'c'/'+', | |
1047 | * which indicates that a fragment (if it exists) is complete. | |
1048 | */ | |
4ceb601d | 1049 | do { |
22eb2f01 VM |
1050 | /* |
1051 | * If there is a fragment in progress, and we're in follow mode, | |
1052 | * read with a timeout so that if no line is read in 100ms, we can | |
1053 | * assume that the fragment is the last line in /dev/kmsg and it | |
1054 | * is completed. | |
1055 | */ | |
1056 | if (ctl->follow && fragment_offset) { | |
1057 | struct pollfd pfd = {.fd = ctl->kmsg, .events = POLLIN}; | |
1058 | poll(&pfd, 1, 100); | |
1059 | /* If 100ms has passed and kmsg has no data to read() */ | |
1060 | if (!(pfd.revents & POLLIN)) { | |
1061 | memcpy(ctl->kmsg_buf, fragment_buf, fragment_offset); | |
1062 | return fragment_offset + 1; | |
1063 | } | |
1064 | } | |
1065 | size = read(ctl->kmsg, ctl->kmsg_buf, sizeof(ctl->kmsg_buf) - 1); | |
1066 | ||
1067 | /* | |
1068 | * If read() would have blocked and we have a fragment in | |
1069 | * progress, assume that it's completed (ie. it was the last line | |
1070 | * in the ring buffer) otherwise it won't be displayed until | |
1071 | * another non-fragment message is logged. | |
1072 | */ | |
1073 | if (errno == EAGAIN && fragment_offset) { | |
1074 | memcpy(ctl->kmsg_buf, fragment_buf, fragment_offset); | |
1075 | return fragment_offset + 1; | |
1076 | } | |
1077 | ||
1078 | if (parse_kmsg_record(ctl, &rec, ctl->kmsg_buf, | |
1079 | (size_t) size) == 0) { | |
1080 | /* | |
1081 | * 'c' can indicate a start of a fragment or a | |
1082 | * continuation, '+' is used in older kernels to | |
1083 | * indicate a continuation. | |
1084 | */ | |
1085 | if (rec.flags == 'c' || rec.flags == '+') { | |
1086 | if (!fragment_offset) { | |
1087 | memcpy(fragment_buf, ctl->kmsg_buf, size); | |
1088 | fragment_offset = size - 1; | |
1089 | } else { | |
1090 | /* | |
1091 | * In case of a buffer overflow, just | |
1092 | * truncate the fragment - no one should | |
1093 | * be logging this much anyway | |
1094 | */ | |
1095 | ssize_t truncate_size = min( | |
1096 | fragment_offset + rec.mesg_size, | |
1097 | sizeof(fragment_buf)); | |
1098 | ||
1099 | memcpy(fragment_buf + fragment_offset, | |
1100 | rec.mesg, truncate_size); | |
1101 | fragment_offset += rec.mesg_size; | |
1102 | } | |
1103 | ||
1104 | } else if (rec.flags == '-') { | |
1105 | /* | |
1106 | * If there was a fragment being built, move it | |
1107 | * into kmsg_buf, but first save a copy of the | |
1108 | * current message so that it doesn't get lost. | |
1109 | */ | |
1110 | if (fragment_offset) { | |
1111 | memcpy(ctl->kmsg_saved, | |
1112 | ctl->kmsg_buf, size); | |
1113 | ctl->kmsg_saved_size = size; | |
1114 | memcpy(ctl->kmsg_buf, | |
1115 | fragment_buf, fragment_offset); | |
1116 | return fragment_offset + 1; | |
1117 | } | |
1118 | } | |
1119 | } | |
1120 | } while ((size < 0 && errno == EPIPE) || | |
1121 | (rec.flags == 'c' || rec.flags == '+')); | |
4ceb601d MB |
1122 | |
1123 | return size; | |
1124 | } | |
1125 | ||
7af23060 KZ |
1126 | static int init_kmsg(struct dmesg_control *ctl) |
1127 | { | |
0fd12a96 KZ |
1128 | int mode = O_RDONLY; |
1129 | ||
1130 | if (!ctl->follow) | |
1131 | mode |= O_NONBLOCK; | |
3938c08c KZ |
1132 | else |
1133 | setlinebuf(stdout); | |
0fd12a96 KZ |
1134 | |
1135 | ctl->kmsg = open("/dev/kmsg", mode); | |
c677ffba KZ |
1136 | if (ctl->kmsg < 0) |
1137 | return -1; | |
1138 | ||
1139 | /* | |
1140 | * Seek after the last record available at the time | |
1141 | * the last SYSLOG_ACTION_CLEAR was issued. | |
1142 | * | |
1143 | * ... otherwise SYSLOG_ACTION_CLEAR will have no effect for kmsg. | |
1144 | */ | |
1145 | lseek(ctl->kmsg, 0, SEEK_DATA); | |
298a073c KZ |
1146 | |
1147 | /* | |
1148 | * Old kernels (<3.5) allow to successfully open /dev/kmsg for | |
1149 | * read-only, but read() returns -EINVAL :-((( | |
1150 | * | |
1151 | * Let's try to read the first record. The record is later processed in | |
1152 | * read_kmsg(). | |
1153 | */ | |
4ceb601d | 1154 | ctl->kmsg_first_read = read_kmsg_one(ctl); |
298a073c KZ |
1155 | if (ctl->kmsg_first_read < 0) { |
1156 | close(ctl->kmsg); | |
1157 | ctl->kmsg = -1; | |
1158 | return -1; | |
1159 | } | |
1160 | ||
c677ffba | 1161 | return 0; |
f4fa5b44 KZ |
1162 | } |
1163 | ||
ddca870a KZ |
1164 | /* |
1165 | * /dev/kmsg record format: | |
1166 | * | |
9e930041 | 1167 | * faclev,seqnum,timestamp[optional, ...];message\n |
ddca870a KZ |
1168 | * TAGNAME=value |
1169 | * ... | |
1170 | * | |
1171 | * - fields are separated by ',' | |
1172 | * - last field is terminated by ';' | |
1173 | * | |
1174 | */ | |
1175 | #define LAST_KMSG_FIELD(s) (!s || !*s || *(s - 1) == ';') | |
1176 | ||
1177 | static int parse_kmsg_record(struct dmesg_control *ctl, | |
1178 | struct dmesg_record *rec, | |
1179 | char *buf, | |
1180 | size_t sz) | |
1181 | { | |
1182 | const char *p = buf, *end; | |
1183 | ||
1184 | if (sz == 0 || !buf || !*buf) | |
1185 | return -1; | |
1186 | ||
1187 | end = buf + (sz - 1); | |
1188 | INIT_DMESG_RECORD(rec); | |
1189 | ||
1190 | while (p < end && isspace(*p)) | |
1191 | p++; | |
1192 | ||
1193 | /* A) priority and facility */ | |
098ce273 OO |
1194 | if (ctl->fltr_lev || ctl->fltr_fac || ctl->decode || |
1195 | ctl->raw || ctl->color) | |
ddca870a KZ |
1196 | p = parse_faclev(p, &rec->facility, &rec->level); |
1197 | else | |
1198 | p = skip_item(p, end, ","); | |
1199 | if (LAST_KMSG_FIELD(p)) | |
1200 | goto mesg; | |
1201 | ||
1202 | /* B) sequence number */ | |
1203 | p = skip_item(p, end, ",;"); | |
1204 | if (LAST_KMSG_FIELD(p)) | |
1205 | goto mesg; | |
1206 | ||
1207 | /* C) timestamp */ | |
776eabe7 | 1208 | if (is_timefmt(ctl, NONE)) |
ddca870a KZ |
1209 | p = skip_item(p, end, ",;"); |
1210 | else | |
1211 | p = parse_kmsg_timestamp(p, &rec->tv); | |
1212 | if (LAST_KMSG_FIELD(p)) | |
1213 | goto mesg; | |
1214 | ||
22eb2f01 VM |
1215 | /* D) flags */ |
1216 | rec->flags = *p; // flag is one char | |
1217 | p = p + 1; | |
1218 | if (LAST_KMSG_FIELD(p)) | |
1219 | goto mesg; | |
1220 | ||
1221 | /* E) optional fields (ignore) */ | |
ddca870a | 1222 | p = skip_item(p, end, ";"); |
ddca870a KZ |
1223 | |
1224 | mesg: | |
22eb2f01 | 1225 | /* F) message text */ |
ddca870a KZ |
1226 | rec->mesg = p; |
1227 | p = skip_item(p, end, "\n"); | |
1228 | ||
1229 | if (!p) | |
1230 | return -1; | |
1231 | ||
1232 | rec->mesg_size = p - rec->mesg; | |
1233 | ||
1234 | /* | |
9e930041 | 1235 | * Kernel escapes non-printable characters, unfortunately kernel |
ddca870a KZ |
1236 | * definition of "non-printable" is too strict. On UTF8 console we can |
1237 | * print many chars, so let's decode from kernel. | |
1238 | */ | |
1239 | unhexmangle_to_buffer(rec->mesg, (char *) rec->mesg, rec->mesg_size + 1); | |
1240 | ||
22eb2f01 | 1241 | /* G) message tags (ignore) */ |
ddca870a KZ |
1242 | |
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * Note that each read() call for /dev/kmsg returns always one record. It means | |
1248 | * that we don't have to read whole message buffer before the records parsing. | |
1249 | * | |
1250 | * So this function does not compose one huge buffer (like read_syslog_buffer()) | |
1251 | * and print_buffer() is unnecessary. All is done in this function. | |
1252 | * | |
1253 | * Returns 0 on success, -1 on error. | |
1254 | */ | |
1255 | static int read_kmsg(struct dmesg_control *ctl) | |
1256 | { | |
ddca870a | 1257 | struct dmesg_record rec; |
298a073c | 1258 | ssize_t sz; |
ddca870a KZ |
1259 | |
1260 | if (ctl->method != DMESG_METHOD_KMSG || ctl->kmsg < 0) | |
1261 | return -1; | |
1262 | ||
298a073c KZ |
1263 | /* |
1264 | * The very first read() call is done in kmsg_init() where we test | |
1265 | * /dev/kmsg usability. The return code from the initial read() is | |
1266 | * stored in ctl->kmsg_first_read; | |
1267 | */ | |
1268 | sz = ctl->kmsg_first_read; | |
ddca870a | 1269 | |
298a073c KZ |
1270 | while (sz > 0) { |
1271 | *(ctl->kmsg_buf + sz) = '\0'; /* for debug messages */ | |
ddca870a | 1272 | |
298a073c KZ |
1273 | if (parse_kmsg_record(ctl, &rec, |
1274 | ctl->kmsg_buf, (size_t) sz) == 0) | |
1275 | print_record(ctl, &rec); | |
37b04d6c | 1276 | |
4ceb601d | 1277 | sz = read_kmsg_one(ctl); |
298a073c | 1278 | } |
ddca870a KZ |
1279 | |
1280 | return 0; | |
1281 | } | |
1282 | ||
eb2306e6 | 1283 | static int which_time_format(const char *s) |
babf605d | 1284 | { |
eb2306e6 | 1285 | if (!strcmp(s, "notime")) |
babf605d | 1286 | return DMESG_TIMEFTM_NONE; |
eb2306e6 | 1287 | if (!strcmp(s, "ctime")) |
babf605d | 1288 | return DMESG_TIMEFTM_CTIME; |
eb2306e6 | 1289 | if (!strcmp(s, "delta")) |
babf605d | 1290 | return DMESG_TIMEFTM_DELTA; |
eb2306e6 | 1291 | if (!strcmp(s, "reltime")) |
babf605d | 1292 | return DMESG_TIMEFTM_RELTIME; |
eb2306e6 | 1293 | if (!strcmp(s, "iso")) |
8a8be309 | 1294 | return DMESG_TIMEFTM_ISO8601; |
eb2306e6 | 1295 | errx(EXIT_FAILURE, _("unknown time format: %s"), s); |
babf605d SK |
1296 | } |
1297 | ||
5a34fb8a KZ |
1298 | #ifdef TEST_DMESG |
1299 | static inline int dmesg_get_boot_time(struct timeval *tv) | |
1300 | { | |
1301 | char *str = getenv("DMESG_TEST_BOOTIME"); | |
1302 | uintmax_t sec, usec; | |
1303 | ||
1304 | if (str && sscanf(str, "%ju.%ju", &sec, &usec) == 2) { | |
1305 | tv->tv_sec = sec; | |
1306 | tv->tv_usec = usec; | |
1307 | return tv->tv_sec >= 0 && tv->tv_usec >= 0 ? 0 : -EINVAL; | |
1308 | } | |
1309 | ||
1310 | return get_boot_time(tv); | |
1311 | } | |
1312 | #else | |
1313 | # define dmesg_get_boot_time get_boot_time | |
1314 | #endif | |
1315 | ||
15103c4b MP |
1316 | int main(int argc, char *argv[]) |
1317 | { | |
1318 | char *buf = NULL; | |
aa192520 | 1319 | int c, nopager = 0; |
48c5c662 | 1320 | int console_level = 0; |
6e9b06cc | 1321 | int klog_rc = 0; |
776eabe7 | 1322 | int delta = 0; |
6e9b06cc | 1323 | ssize_t n; |
9b3a6984 | 1324 | static struct dmesg_control ctl = { |
e6471b9f | 1325 | .filename = NULL, |
7ff1f63f | 1326 | .action = SYSLOG_ACTION_READ_ALL, |
ed61acc2 | 1327 | .method = DMESG_METHOD_KMSG, |
7af23060 | 1328 | .kmsg = -1, |
776eabe7 | 1329 | .time_fmt = DMESG_TIMEFTM_TIME, |
b45c3da2 | 1330 | .indent = 0, |
9b3a6984 | 1331 | }; |
d0c9ddc3 | 1332 | int colormode = UL_COLORMODE_UNDEF; |
babf605d SK |
1333 | enum { |
1334 | OPT_TIME_FORMAT = CHAR_MAX + 1, | |
1335 | }; | |
6dbe3af9 | 1336 | |
4a3b7949 | 1337 | static const struct option longopts[] = { |
4a3b7949 | 1338 | { "buffer-size", required_argument, NULL, 's' }, |
5ef05369 | 1339 | { "clear", no_argument, NULL, 'C' }, |
9bc2b51a | 1340 | { "color", optional_argument, NULL, 'L' }, |
4a3b7949 | 1341 | { "console-level", required_argument, NULL, 'n' }, |
bd304d92 KZ |
1342 | { "console-off", no_argument, NULL, 'D' }, |
1343 | { "console-on", no_argument, NULL, 'E' }, | |
5ef05369 | 1344 | { "decode", no_argument, NULL, 'x' }, |
c672220f | 1345 | { "file", required_argument, NULL, 'F' }, |
0e24df3b | 1346 | { "facility", required_argument, NULL, 'f' }, |
0fd12a96 | 1347 | { "follow", no_argument, NULL, 'w' }, |
f0a3a1ca | 1348 | { "human", no_argument, NULL, 'H' }, |
4a3b7949 | 1349 | { "help", no_argument, NULL, 'h' }, |
25000180 | 1350 | { "kernel", no_argument, NULL, 'k' }, |
5ef05369 | 1351 | { "level", required_argument, NULL, 'l' }, |
ed61acc2 | 1352 | { "syslog", no_argument, NULL, 'S' }, |
5ef05369 KZ |
1353 | { "raw", no_argument, NULL, 'r' }, |
1354 | { "read-clear", no_argument, NULL, 'c' }, | |
60464b1f | 1355 | { "reltime", no_argument, NULL, 'e' }, |
bd304d92 | 1356 | { "show-delta", no_argument, NULL, 'd' }, |
42fac79a | 1357 | { "ctime", no_argument, NULL, 'T' }, |
d74b8dfc | 1358 | { "notime", no_argument, NULL, 't' }, |
aa192520 | 1359 | { "nopager", no_argument, NULL, 'P' }, |
25000180 | 1360 | { "userspace", no_argument, NULL, 'u' }, |
5ef05369 | 1361 | { "version", no_argument, NULL, 'V' }, |
babf605d | 1362 | { "time-format", required_argument, NULL, OPT_TIME_FORMAT }, |
4a3b7949 KZ |
1363 | { NULL, 0, NULL, 0 } |
1364 | }; | |
1365 | ||
a7349ee3 | 1366 | static const ul_excl_t excl[] = { /* rows and cols in ASCII order */ |
1a38ad5c | 1367 | { 'C','D','E','c','n','r' }, /* clear,off,on,read-clear,level,raw*/ |
f0a3a1ca | 1368 | { 'H','r' }, /* human, raw */ |
5aaee63c | 1369 | { 'L','r' }, /* color, raw */ |
43d2eeef | 1370 | { 'S','w' }, /* syslog,follow */ |
1a38ad5c KZ |
1371 | { 'T','r' }, /* ctime, raw */ |
1372 | { 'd','r' }, /* delta, raw */ | |
1373 | { 'e','r' }, /* reltime, raw */ | |
1374 | { 'r','x' }, /* raw, decode */ | |
1375 | { 'r','t' }, /* notime, raw */ | |
43d2eeef KZ |
1376 | { 0 } |
1377 | }; | |
1378 | int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT; | |
1379 | ||
df1dddf9 KZ |
1380 | setlocale(LC_ALL, ""); |
1381 | bindtextdomain(PACKAGE, LOCALEDIR); | |
1382 | textdomain(PACKAGE); | |
efb8854f | 1383 | atexit(close_stdout); |
7eda085c | 1384 | |
9bc2b51a | 1385 | while ((c = getopt_long(argc, argv, "CcDdEeF:f:HhkL::l:n:iPrSs:TtuVwx", |
aca1633a | 1386 | longopts, NULL)) != -1) { |
43d2eeef KZ |
1387 | |
1388 | err_exclusive_options(c, longopts, excl, excl_st); | |
1389 | ||
df1dddf9 | 1390 | switch (c) { |
04199860 | 1391 | case 'C': |
e6471b9f | 1392 | ctl.action = SYSLOG_ACTION_CLEAR; |
04199860 | 1393 | break; |
df1dddf9 | 1394 | case 'c': |
e6471b9f | 1395 | ctl.action = SYSLOG_ACTION_READ_CLEAR; |
df1dddf9 | 1396 | break; |
bd304d92 | 1397 | case 'D': |
e6471b9f | 1398 | ctl.action = SYSLOG_ACTION_CONSOLE_OFF; |
2170174e | 1399 | break; |
bd304d92 | 1400 | case 'd': |
776eabe7 | 1401 | delta = 1; |
bd304d92 KZ |
1402 | break; |
1403 | case 'E': | |
e6471b9f | 1404 | ctl.action = SYSLOG_ACTION_CONSOLE_ON; |
2170174e | 1405 | break; |
60464b1f | 1406 | case 'e': |
776eabe7 | 1407 | ctl.time_fmt = DMESG_TIMEFTM_RELTIME; |
60464b1f | 1408 | break; |
c672220f | 1409 | case 'F': |
9b3a6984 | 1410 | ctl.filename = optarg; |
e6471b9f | 1411 | ctl.method = DMESG_METHOD_MMAP; |
c672220f | 1412 | break; |
0e24df3b | 1413 | case 'f': |
aca1633a | 1414 | ctl.fltr_fac = 1; |
c87638ad KZ |
1415 | if (string_to_bitarray(optarg, |
1416 | ctl.facilities, parse_facility) < 0) | |
1417 | return EXIT_FAILURE; | |
0e24df3b | 1418 | break; |
f0a3a1ca | 1419 | case 'H': |
776eabe7 | 1420 | ctl.time_fmt = DMESG_TIMEFTM_RELTIME; |
81bd88e4 | 1421 | colormode = UL_COLORMODE_AUTO; |
aa192520 | 1422 | ctl.pager = 1; |
f0a3a1ca | 1423 | break; |
5ef05369 | 1424 | case 'h': |
6e1eda6f | 1425 | usage(); |
df1dddf9 | 1426 | break; |
25000180 | 1427 | case 'k': |
aca1633a KZ |
1428 | ctl.fltr_fac = 1; |
1429 | setbit(ctl.facilities, FAC_BASE(LOG_KERN)); | |
25000180 | 1430 | break; |
098ce273 | 1431 | case 'L': |
9bc2b51a | 1432 | colormode = UL_COLORMODE_AUTO; |
b7faf991 KZ |
1433 | if (optarg) |
1434 | colormode = colormode_or_err(optarg, | |
1435 | _("unsupported color mode")); | |
098ce273 | 1436 | break; |
636a6207 | 1437 | case 'l': |
aca1633a | 1438 | ctl.fltr_lev= 1; |
c87638ad KZ |
1439 | if (string_to_bitarray(optarg, |
1440 | ctl.levels, parse_level) < 0) | |
1441 | return EXIT_FAILURE; | |
636a6207 | 1442 | break; |
5ef05369 | 1443 | case 'n': |
e6471b9f | 1444 | ctl.action = SYSLOG_ACTION_CONSOLE_LEVEL; |
5ef05369 KZ |
1445 | console_level = parse_level(optarg, 0); |
1446 | break; | |
aa192520 KZ |
1447 | case 'P': |
1448 | nopager = 1; | |
1449 | break; | |
11ea22d5 | 1450 | case 'r': |
aca1633a | 1451 | ctl.raw = 1; |
11ea22d5 | 1452 | break; |
ed61acc2 KZ |
1453 | case 'S': |
1454 | ctl.method = DMESG_METHOD_SYSLOG; | |
1455 | break; | |
df1dddf9 | 1456 | case 's': |
e6471b9f KZ |
1457 | ctl.bufsize = strtou32_or_err(optarg, |
1458 | _("invalid buffer size argument")); | |
1459 | if (ctl.bufsize < 4096) | |
1460 | ctl.bufsize = 4096; | |
df1dddf9 | 1461 | break; |
42fac79a | 1462 | case 'T': |
776eabe7 | 1463 | ctl.time_fmt = DMESG_TIMEFTM_CTIME; |
42fac79a | 1464 | break; |
d74b8dfc | 1465 | case 't': |
776eabe7 | 1466 | ctl.time_fmt = DMESG_TIMEFTM_NONE; |
d74b8dfc | 1467 | break; |
25000180 | 1468 | case 'u': |
aca1633a | 1469 | ctl.fltr_fac = 1; |
738767b9 | 1470 | for (n = 1; (size_t) n < ARRAY_SIZE(facility_names); n++) |
aca1633a | 1471 | setbit(ctl.facilities, n); |
25000180 | 1472 | break; |
4a3b7949 | 1473 | case 'V': |
f6277500 | 1474 | printf(UTIL_LINUX_VERSION); |
4a3b7949 | 1475 | return EXIT_SUCCESS; |
0fd12a96 | 1476 | case 'w': |
0fd12a96 KZ |
1477 | ctl.follow = 1; |
1478 | break; | |
5ef05369 | 1479 | case 'x': |
aca1633a | 1480 | ctl.decode = 1; |
4a3b7949 | 1481 | break; |
babf605d SK |
1482 | case OPT_TIME_FORMAT: |
1483 | ctl.time_fmt = which_time_format(optarg); | |
1484 | break; | |
df1dddf9 | 1485 | default: |
677ec86c | 1486 | errtryhelp(EXIT_FAILURE); |
df1dddf9 KZ |
1487 | } |
1488 | } | |
e6c379eb | 1489 | |
6e1eda6f RM |
1490 | if (argc != optind) { |
1491 | warnx(_("bad usage")); | |
1492 | errtryhelp(EXIT_FAILURE); | |
1493 | } | |
6dbe3af9 | 1494 | |
74ce680a SK |
1495 | if ((is_timefmt(&ctl, RELTIME) || |
1496 | is_timefmt(&ctl, CTIME) || | |
1497 | is_timefmt(&ctl, ISO8601)) | |
1498 | && dmesg_get_boot_time(&ctl.boot_time) != 0) | |
1499 | ctl.time_fmt = DMESG_TIMEFTM_NONE; | |
9bc2b51a | 1500 | |
776eabe7 SK |
1501 | if (delta) |
1502 | switch (ctl.time_fmt) { | |
1503 | case DMESG_TIMEFTM_CTIME: | |
1504 | ctl.time_fmt = DMESG_TIMEFTM_CTIME_DELTA; | |
1505 | break; | |
1506 | case DMESG_TIMEFTM_TIME: | |
1507 | ctl.time_fmt = DMESG_TIMEFTM_TIME_DELTA; | |
1508 | break; | |
e7ba987a SK |
1509 | case DMESG_TIMEFTM_ISO8601: |
1510 | warnx(_("--show-delta is ignored when used together with iso8601 time format")); | |
1511 | break; | |
776eabe7 SK |
1512 | default: |
1513 | ctl.time_fmt = DMESG_TIMEFTM_DELTA; | |
1514 | } | |
1515 | ||
776eabe7 | 1516 | |
d0c9ddc3 | 1517 | ctl.color = colors_init(colormode, "dmesg") ? 1 : 0; |
5042cdcf KZ |
1518 | if (ctl.follow) |
1519 | nopager = 1; | |
aa192520 KZ |
1520 | ctl.pager = nopager ? 0 : ctl.pager; |
1521 | if (ctl.pager) | |
e215d467 | 1522 | pager_redirect(); |
aa192520 | 1523 | |
e6471b9f | 1524 | switch (ctl.action) { |
48c5c662 KZ |
1525 | case SYSLOG_ACTION_READ_ALL: |
1526 | case SYSLOG_ACTION_READ_CLEAR: | |
7af23060 KZ |
1527 | if (ctl.method == DMESG_METHOD_KMSG && init_kmsg(&ctl) != 0) |
1528 | ctl.method = DMESG_METHOD_SYSLOG; | |
1a38ad5c KZ |
1529 | |
1530 | if (ctl.raw | |
1531 | && ctl.method != DMESG_METHOD_KMSG | |
1532 | && (ctl.fltr_lev || ctl.fltr_fac)) | |
62698149 BS |
1533 | errx(EXIT_FAILURE, _("--raw can be used together with --level or " |
1534 | "--facility only when reading messages from /dev/kmsg")); | |
aa192520 | 1535 | if (ctl.pager) |
e215d467 | 1536 | pager_redirect(); |
6e9b06cc KZ |
1537 | n = read_buffer(&ctl, &buf); |
1538 | if (n > 0) | |
1539 | print_buffer(&ctl, buf, n); | |
7ff1f63f | 1540 | if (!ctl.mmap_buff) |
c672220f | 1541 | free(buf); |
6e9b06cc KZ |
1542 | if (n < 0) |
1543 | err(EXIT_FAILURE, _("read kernel buffer failed")); | |
1544 | if (ctl.kmsg >= 0) | |
1545 | close(ctl.kmsg); | |
48c5c662 | 1546 | break; |
04199860 | 1547 | case SYSLOG_ACTION_CLEAR: |
2170174e KZ |
1548 | case SYSLOG_ACTION_CONSOLE_OFF: |
1549 | case SYSLOG_ACTION_CONSOLE_ON: | |
6e9b06cc | 1550 | klog_rc = klogctl(ctl.action, NULL, 0); |
04199860 | 1551 | break; |
48c5c662 | 1552 | case SYSLOG_ACTION_CONSOLE_LEVEL: |
6e9b06cc | 1553 | klog_rc = klogctl(ctl.action, NULL, console_level); |
48c5c662 KZ |
1554 | break; |
1555 | default: | |
1556 | errx(EXIT_FAILURE, _("unsupported command")); | |
1557 | break; | |
df1dddf9 | 1558 | } |
6dbe3af9 | 1559 | |
7af23060 | 1560 | |
6e9b06cc | 1561 | if (klog_rc) |
15103c4b | 1562 | err(EXIT_FAILURE, _("klogctl failed")); |
6dbe3af9 | 1563 | |
15103c4b | 1564 | return EXIT_SUCCESS; |
6dbe3af9 | 1565 | } |