]>
Commit | Line | Data |
---|---|---|
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 <linux/unistd.h> |
10 | #include <stdio.h> | |
11 | #include <getopt.h> | |
fd6b7a7f | 12 | #include <stdlib.h> |
15673c15 | 13 | #include <sys/klog.h> |
f06ec64f | 14 | #include <sys/syslog.h> |
bd304d92 | 15 | #include <sys/time.h> |
42fac79a | 16 | #include <sys/sysinfo.h> |
15103c4b | 17 | #include <ctype.h> |
bd304d92 | 18 | #include <time.h> |
c672220f KZ |
19 | #include <sys/mman.h> |
20 | #include <sys/types.h> | |
21 | #include <sys/stat.h> | |
22 | #include <unistd.h> | |
23 | #include <fcntl.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" |
08ca3e26 | 36 | #include "boottime.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. | |
122 | * We want to use the codes as array idexes, so shift back... | |
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 */ | |
e6471b9f | 182 | |
c672220f KZ |
183 | /* |
184 | * For the --file option we mmap whole file. The unnecessary (already | |
185 | * printed) pages are always unmapped. The result is that we have in | |
455fe9a0 | 186 | * memory only the currently used page(s). |
c672220f | 187 | */ |
9b3a6984 | 188 | char *filename; |
c672220f KZ |
189 | char *mmap_buff; |
190 | size_t pagesize; | |
776eabe7 | 191 | unsigned int time_fmt; /* time format */ |
c672220f | 192 | |
0fd12a96 KZ |
193 | unsigned int follow:1, /* wait for new messages */ |
194 | raw:1, /* raw mode */ | |
9feec79c KZ |
195 | fltr_lev:1, /* filter out by levels[] */ |
196 | fltr_fac:1, /* filter out by facilities[] */ | |
197 | decode:1, /* use "facility: level: " prefix */ | |
aa192520 | 198 | pager:1, /* pipe output into a pager */ |
098ce273 | 199 | color:1; /* colorize messages */ |
aca1633a | 200 | }; |
f4fa5b44 | 201 | |
a7ee94f2 KZ |
202 | struct dmesg_record { |
203 | const char *mesg; | |
204 | size_t mesg_size; | |
205 | ||
206 | int level; | |
207 | int facility; | |
bd304d92 | 208 | struct timeval tv; |
a7ee94f2 KZ |
209 | |
210 | const char *next; /* buffer with next unparsed record */ | |
211 | size_t next_size; /* size of the next buffer */ | |
212 | }; | |
213 | ||
ddca870a KZ |
214 | #define INIT_DMESG_RECORD(_r) do { \ |
215 | (_r)->mesg = NULL; \ | |
216 | (_r)->mesg_size = 0; \ | |
217 | (_r)->facility = -1; \ | |
218 | (_r)->level = -1; \ | |
219 | (_r)->tv.tv_sec = 0; \ | |
220 | (_r)->tv.tv_usec = 0; \ | |
221 | } while (0) | |
222 | ||
223 | static int read_kmsg(struct dmesg_control *ctl); | |
224 | ||
5aaee63c | 225 | static int set_level_color(int log_level, const char *mesg, size_t mesgsz) |
098ce273 | 226 | { |
f4bc7f96 KZ |
227 | int id = -1; |
228 | ||
098ce273 OO |
229 | switch (log_level) { |
230 | case LOG_ALERT: | |
f4bc7f96 KZ |
231 | id = DMESG_COLOR_ALERT; |
232 | break; | |
098ce273 | 233 | case LOG_CRIT: |
f4bc7f96 KZ |
234 | id = DMESG_COLOR_CRIT; |
235 | break; | |
098ce273 | 236 | case LOG_ERR: |
f4bc7f96 KZ |
237 | id = DMESG_COLOR_ERR; |
238 | break; | |
5aaee63c | 239 | case LOG_WARNING: |
f4bc7f96 KZ |
240 | id = DMESG_COLOR_WARN; |
241 | break; | |
098ce273 OO |
242 | default: |
243 | break; | |
244 | } | |
245 | ||
5aaee63c KZ |
246 | /* well, sometimes the messges contains important keywords, but in |
247 | * non-warning/error messages | |
248 | */ | |
f4bc7f96 KZ |
249 | if (id < 0 && memmem(mesg, mesgsz, "segfault at", 11)) |
250 | id = DMESG_COLOR_SEGFAULT; | |
5aaee63c | 251 | |
f4bc7f96 KZ |
252 | if (id >= 0) |
253 | dmesg_enable_color(id); | |
254 | ||
255 | return id >= 0 ? 0 : -1; | |
098ce273 | 256 | } |
ddca870a | 257 | |
4a3b7949 | 258 | static void __attribute__((__noreturn__)) usage(FILE *out) |
15103c4b | 259 | { |
738767b9 | 260 | size_t i; |
f06ec64f | 261 | |
fbbc4c88 SK |
262 | fputs(USAGE_HEADER, out); |
263 | fprintf(out, _(" %s [options]\n"), program_invocation_short_name); | |
264 | fputs(USAGE_OPTIONS, out); | |
265 | fputs(_(" -C, --clear clear the kernel ring buffer\n"), out); | |
266 | fputs(_(" -c, --read-clear read and clear all messages\n"), out); | |
267 | fputs(_(" -D, --console-off disable printing messages to console\n"), out); | |
fbbc4c88 SK |
268 | fputs(_(" -E, --console-on enable printing messages to console\n"), out); |
269 | fputs(_(" -F, --file <file> use the file instead of the kernel log buffer\n"), out); | |
270 | fputs(_(" -f, --facility <list> restrict output to defined facilities\n"), out); | |
f0a3a1ca | 271 | fputs(_(" -H, --human human readable output\n"), out); |
fbbc4c88 | 272 | fputs(_(" -k, --kernel display kernel messages\n"), out); |
9bc2b51a | 273 | fputs(_(" -L, --color[=<when>] colorize messages (auto, always or never)\n"), out); |
fbbc4c88 SK |
274 | fputs(_(" -l, --level <list> restrict output to defined levels\n"), out); |
275 | fputs(_(" -n, --console-level <level> set level of messages printed to console\n"), out); | |
aa192520 | 276 | fputs(_(" -P, --nopager do not pipe output into a pager\n"), out); |
fbbc4c88 SK |
277 | fputs(_(" -r, --raw print the raw message buffer\n"), out); |
278 | fputs(_(" -S, --syslog force to use syslog(2) rather than /dev/kmsg\n"), out); | |
279 | fputs(_(" -s, --buffer-size <size> buffer size to query the kernel ring buffer\n"), out); | |
fbbc4c88 SK |
280 | fputs(_(" -u, --userspace display userspace messages\n"), out); |
281 | fputs(_(" -w, --follow wait for new messages\n"), out); | |
282 | fputs(_(" -x, --decode decode facility and level to readable string\n"), out); | |
06dd56f9 SK |
283 | fputs(_(" -d, --show-delta show time delta between printed messages\n"), out); |
284 | fputs(_(" -e, --reltime show local time and time delta in readable format\n"), out); | |
285 | fputs(_(" -T, --ctime show human readable timestamp\n"), out); | |
286 | fputs(_(" -t, --notime don't print messages timestamp\n"), out); | |
babf605d | 287 | fputs(_(" --time-format <format> show time stamp using format:\n" |
06dd56f9 SK |
288 | " [delta|reltime|ctime|notime|iso]\n" |
289 | "Suspending/resume will make ctime and iso timestamps inaccurate.\n"), out); | |
fbbc4c88 SK |
290 | fputs(USAGE_SEPARATOR, out); |
291 | fputs(USAGE_HELP, out); | |
292 | fputs(USAGE_VERSION, out); | |
dcd16b0f | 293 | fputs(_("\nSupported log facilities:\n"), out); |
fbbc4c88 | 294 | for (i = 0; i < ARRAY_SIZE(level_names); i++) |
963ac507 | 295 | fprintf(out, " %7s - %s\n", |
fbbc4c88 SK |
296 | facility_names[i].name, |
297 | _(facility_names[i].help)); | |
85f3cc55 | 298 | |
dcd16b0f | 299 | fputs(_("\nSupported log levels (priorities):\n"), out); |
fbbc4c88 | 300 | for (i = 0; i < ARRAY_SIZE(level_names); i++) |
963ac507 | 301 | fprintf(out, " %7s - %s\n", |
fbbc4c88 SK |
302 | level_names[i].name, |
303 | _(level_names[i].help)); | |
0a86a1a6 | 304 | fputs(USAGE_SEPARATOR, out); |
30b44cf1 | 305 | fprintf(out, USAGE_MAN_TAIL("dmesg(1)")); |
4a3b7949 | 306 | exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); |
6dbe3af9 KZ |
307 | } |
308 | ||
5ef05369 KZ |
309 | /* |
310 | * LEVEL ::= <number> | <name> | |
8c8fa302 BM |
311 | * <number> ::= @len is set: number in range <0..N>, where N < ARRAY_SIZE(level_names) |
312 | * ::= @len not set: number in range <1..N>, where N <= ARRAY_SIZE(level_names) | |
5ef05369 | 313 | * <name> ::= case-insensitive text |
8c8fa302 BM |
314 | * |
315 | * Note that @len argument is not set when parsing "-n <level>" command line | |
316 | * option. The console_level is intepreted as "log level less than the value". | |
317 | * | |
318 | * For example "dmesg -n 8" or "dmesg -n debug" enables debug console log | |
319 | * level by klogctl(SYSLOG_ACTION_CONSOLE_LEVEL, NULL, 8). The @str argument | |
320 | * has to be parsed to number in range <1..8>. | |
5ef05369 | 321 | */ |
5c8f6bc6 | 322 | static int parse_level(const char *str, size_t len) |
f06ec64f | 323 | { |
8c8fa302 BM |
324 | int offset = 0; |
325 | ||
5c8f6bc6 | 326 | if (!str) |
f06ec64f | 327 | return -1; |
8c8fa302 | 328 | if (!len) { |
5c8f6bc6 | 329 | len = strlen(str); |
8c8fa302 BM |
330 | offset = 1; |
331 | } | |
5c8f6bc6 | 332 | errno = 0; |
f06ec64f | 333 | |
5c8f6bc6 KZ |
334 | if (isdigit(*str)) { |
335 | char *end = NULL; | |
8c8fa302 | 336 | long x = strtol(str, &end, 10) - offset; |
5c8f6bc6 | 337 | |
738767b9 KZ |
338 | if (!errno && end && end > str && (size_t) (end - str) == len && |
339 | x >= 0 && (size_t) x < ARRAY_SIZE(level_names)) | |
8c8fa302 | 340 | return x + offset; |
5c8f6bc6 | 341 | } else { |
738767b9 KZ |
342 | size_t i; |
343 | ||
5c8f6bc6 KZ |
344 | for (i = 0; i < ARRAY_SIZE(level_names); i++) { |
345 | const char *n = level_names[i].name; | |
346 | ||
347 | if (strncasecmp(str, n, len) == 0 && *(n + len) == '\0') | |
8c8fa302 | 348 | return i + offset; |
5c8f6bc6 KZ |
349 | } |
350 | } | |
351 | ||
352 | if (errno) | |
353 | err(EXIT_FAILURE, _("failed to parse level '%s'"), str); | |
354 | ||
355 | errx(EXIT_FAILURE, _("unknown level '%s'"), str); | |
f06ec64f KZ |
356 | return -1; |
357 | } | |
358 | ||
5ef05369 KZ |
359 | /* |
360 | * FACILITY ::= <number> | <name> | |
361 | * <number> ::= number in range <0..N>, where N < ARRAY_SIZE(facility_names) | |
362 | * <name> ::= case-insensitive text | |
363 | */ | |
0e24df3b KZ |
364 | static int parse_facility(const char *str, size_t len) |
365 | { | |
0e24df3b KZ |
366 | if (!str) |
367 | return -1; | |
368 | if (!len) | |
369 | len = strlen(str); | |
370 | errno = 0; | |
371 | ||
372 | if (isdigit(*str)) { | |
373 | char *end = NULL; | |
738767b9 | 374 | long x = strtol(str, &end, 10); |
0e24df3b | 375 | |
738767b9 KZ |
376 | if (!errno && end && end > str && (size_t) (end - str) == len && |
377 | x >= 0 && (size_t) x < ARRAY_SIZE(facility_names)) | |
378 | return x; | |
0e24df3b | 379 | } else { |
738767b9 KZ |
380 | size_t i; |
381 | ||
0e24df3b KZ |
382 | for (i = 0; i < ARRAY_SIZE(facility_names); i++) { |
383 | const char *n = facility_names[i].name; | |
384 | ||
385 | if (strncasecmp(str, n, len) == 0 && *(n + len) == '\0') | |
386 | return i; | |
387 | } | |
388 | } | |
389 | ||
390 | if (errno) | |
391 | err(EXIT_FAILURE, _("failed to parse facility '%s'"), str); | |
392 | ||
393 | errx(EXIT_FAILURE, _("unknown facility '%s'"), str); | |
394 | return -1; | |
395 | } | |
396 | ||
5ef05369 KZ |
397 | /* |
398 | * Parses numerical prefix used for all messages in kernel ring buffer. | |
399 | * | |
400 | * Priorities/facilities are encoded into a single 32-bit quantity, where the | |
401 | * bottom 3 bits are the priority (0-7) and the top 28 bits are the facility | |
402 | * (0-big number). | |
403 | * | |
ddca870a | 404 | * Note that the number has to end with '>' or ',' char. |
5ef05369 | 405 | */ |
636a6207 KZ |
406 | static const char *parse_faclev(const char *str, int *fac, int *lev) |
407 | { | |
408 | long num; | |
409 | char *end = NULL; | |
410 | ||
411 | if (!str) | |
412 | return str; | |
413 | ||
414 | errno = 0; | |
415 | num = strtol(str, &end, 10); | |
416 | ||
417 | if (!errno && end && end > str) { | |
418 | *fac = LOG_FAC(num); | |
419 | *lev = LOG_PRI(num); | |
85f3cc55 | 420 | |
738767b9 | 421 | if (*lev < 0 || (size_t) *lev > ARRAY_SIZE(level_names)) |
85f3cc55 | 422 | *lev = -1; |
738767b9 | 423 | if (*fac < 0 || (size_t) *fac > ARRAY_SIZE(facility_names)) |
85f3cc55 | 424 | *fac = -1; |
ddca870a | 425 | return end + 1; /* skip '<' or ',' */ |
636a6207 KZ |
426 | } |
427 | ||
428 | return str; | |
429 | } | |
430 | ||
ddca870a KZ |
431 | /* |
432 | * Parses timestamp from syslog message prefix, expected format: | |
433 | * | |
434 | * seconds.microseconds] | |
435 | * | |
436 | * the ']' is the timestamp field terminator. | |
437 | */ | |
438 | static const char *parse_syslog_timestamp(const char *str0, struct timeval *tv) | |
bd304d92 KZ |
439 | { |
440 | const char *str = str0; | |
441 | char *end = NULL; | |
442 | ||
443 | if (!str0) | |
444 | return str0; | |
445 | ||
446 | errno = 0; | |
447 | tv->tv_sec = strtol(str, &end, 10); | |
448 | ||
449 | if (!errno && end && *end == '.' && *(end + 1)) { | |
450 | str = end + 1; | |
451 | end = NULL; | |
452 | tv->tv_usec = strtol(str, &end, 10); | |
453 | } | |
454 | if (errno || !end || end == str || *end != ']') | |
455 | return str0; | |
456 | ||
457 | return end + 1; /* skip ']' */ | |
458 | } | |
459 | ||
ddca870a KZ |
460 | /* |
461 | * Parses timestamp from /dev/kmsg, expected formats: | |
462 | * | |
463 | * microseconds, | |
464 | * microseconds; | |
465 | * | |
466 | * the ',' is fields separators and ';' items terminator (for the last item) | |
467 | */ | |
468 | static const char *parse_kmsg_timestamp(const char *str0, struct timeval *tv) | |
469 | { | |
470 | const char *str = str0; | |
471 | char *end = NULL; | |
472 | uint64_t usec; | |
473 | ||
474 | if (!str0) | |
475 | return str0; | |
476 | ||
477 | errno = 0; | |
478 | usec = strtoumax(str, &end, 10); | |
479 | ||
480 | if (!errno && end && (*end == ';' || *end == ',')) { | |
481 | tv->tv_usec = usec % 1000000; | |
482 | tv->tv_sec = usec / 1000000; | |
483 | } else | |
484 | return str0; | |
485 | ||
486 | return end + 1; /* skip separator */ | |
487 | } | |
488 | ||
bd304d92 KZ |
489 | |
490 | static double time_diff(struct timeval *a, struct timeval *b) | |
491 | { | |
492 | return (a->tv_sec - b->tv_sec) + (a->tv_usec - b->tv_usec) / 1E6; | |
493 | } | |
494 | ||
7ff1f63f | 495 | static int get_syslog_buffer_size(void) |
eed99b2a KZ |
496 | { |
497 | int n = klogctl(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0); | |
498 | ||
499 | return n > 0 ? n : 0; | |
500 | } | |
501 | ||
c672220f | 502 | /* |
7ff1f63f | 503 | * Reads messages from regular file by mmap |
c672220f | 504 | */ |
7ff1f63f | 505 | static ssize_t mmap_file_buffer(struct dmesg_control *ctl, char **buf) |
c672220f KZ |
506 | { |
507 | struct stat st; | |
9b3a6984 | 508 | int fd; |
c672220f | 509 | |
9b3a6984 KZ |
510 | if (!ctl->filename) |
511 | return -1; | |
512 | ||
513 | fd = open(ctl->filename, O_RDONLY); | |
c672220f | 514 | if (fd < 0) |
9b3a6984 | 515 | err(EXIT_FAILURE, _("cannot open %s"), ctl->filename); |
c672220f | 516 | if (fstat(fd, &st)) |
9b3a6984 | 517 | err(EXIT_FAILURE, _("stat failed %s"), ctl->filename); |
c672220f KZ |
518 | |
519 | *buf = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0); | |
520 | if (*buf == MAP_FAILED) | |
9b3a6984 | 521 | err(EXIT_FAILURE, _("cannot mmap: %s"), ctl->filename); |
c672220f KZ |
522 | ctl->mmap_buff = *buf; |
523 | ctl->pagesize = getpagesize(); | |
524 | close(fd); | |
525 | ||
526 | return st.st_size; | |
527 | } | |
528 | ||
5ef05369 | 529 | /* |
7ff1f63f | 530 | * Reads messages from kernel ring buffer by klogctl() |
5ef05369 | 531 | */ |
7ff1f63f | 532 | static ssize_t read_syslog_buffer(struct dmesg_control *ctl, char **buf) |
65e3eed9 KZ |
533 | { |
534 | size_t sz; | |
535 | int rc = -1; | |
65e3eed9 | 536 | |
e6471b9f KZ |
537 | if (ctl->bufsize) { |
538 | sz = ctl->bufsize + 8; | |
65e3eed9 | 539 | *buf = xmalloc(sz * sizeof(char)); |
e6471b9f | 540 | rc = klogctl(ctl->action, *buf, sz); |
65e3eed9 KZ |
541 | } else { |
542 | sz = 16392; | |
543 | while (1) { | |
544 | *buf = xmalloc(sz * sizeof(char)); | |
545 | rc = klogctl(SYSLOG_ACTION_READ_ALL, *buf, sz); | |
738767b9 KZ |
546 | if (rc < 0) |
547 | break; | |
548 | if ((size_t) rc != sz || sz > (1 << 28)) | |
65e3eed9 KZ |
549 | break; |
550 | free(*buf); | |
551 | *buf = NULL; | |
552 | sz *= 4; | |
553 | } | |
554 | ||
e6471b9f | 555 | if (rc > 0 && ctl->action == SYSLOG_ACTION_READ_CLEAR) |
65e3eed9 KZ |
556 | rc = klogctl(SYSLOG_ACTION_READ_CLEAR, *buf, sz); |
557 | } | |
558 | ||
559 | return rc; | |
560 | } | |
561 | ||
7ff1f63f KZ |
562 | /* |
563 | * Top level function to read messages | |
564 | */ | |
e6471b9f KZ |
565 | static ssize_t read_buffer(struct dmesg_control *ctl, char **buf) |
566 | { | |
567 | ssize_t n = -1; | |
568 | ||
569 | switch (ctl->method) { | |
570 | case DMESG_METHOD_MMAP: | |
7ff1f63f | 571 | n = mmap_file_buffer(ctl, buf); |
e6471b9f KZ |
572 | break; |
573 | case DMESG_METHOD_SYSLOG: | |
574 | if (!ctl->bufsize) | |
7ff1f63f | 575 | ctl->bufsize = get_syslog_buffer_size(); |
e6471b9f | 576 | |
7ff1f63f | 577 | n = read_syslog_buffer(ctl, buf); |
e6471b9f | 578 | break; |
ddca870a KZ |
579 | case DMESG_METHOD_KMSG: |
580 | /* | |
581 | * Since kernel 3.5.0 | |
582 | */ | |
583 | n = read_kmsg(ctl); | |
c677ffba KZ |
584 | if (n == 0 && ctl->action == SYSLOG_ACTION_READ_CLEAR) |
585 | n = klogctl(SYSLOG_ACTION_CLEAR, NULL, 0); | |
ddca870a | 586 | break; |
e6471b9f KZ |
587 | } |
588 | ||
589 | return n; | |
590 | } | |
591 | ||
b8300c0a KZ |
592 | static int fwrite_hex(const char *buf, size_t size, FILE *out) |
593 | { | |
738767b9 | 594 | size_t i; |
b8300c0a KZ |
595 | |
596 | for (i = 0; i < size; i++) { | |
597 | int rc = fprintf(out, "\\x%02x", buf[i]); | |
598 | if (rc < 0) | |
599 | return rc; | |
600 | } | |
601 | return 0; | |
602 | } | |
603 | ||
5ef05369 KZ |
604 | /* |
605 | * Prints to 'out' and non-printable chars are replaced with \x<hex> sequences. | |
606 | */ | |
b8300c0a KZ |
607 | static void safe_fwrite(const char *buf, size_t size, FILE *out) |
608 | { | |
738767b9 | 609 | size_t i; |
b8300c0a KZ |
610 | #ifdef HAVE_WIDECHAR |
611 | mbstate_t s; | |
612 | memset(&s, 0, sizeof (s)); | |
613 | #endif | |
614 | for (i = 0; i < size; i++) { | |
615 | const char *p = buf + i; | |
616 | int rc, hex = 0; | |
d9bdd89d | 617 | size_t len; |
b8300c0a KZ |
618 | |
619 | #ifdef HAVE_WIDECHAR | |
620 | wchar_t wc; | |
0720766e | 621 | len = mbrtowc(&wc, p, size - i, &s); |
b8300c0a KZ |
622 | |
623 | if (len == 0) /* L'\0' */ | |
624 | return; | |
625 | ||
730d5e77 | 626 | if (len == (size_t)-1 || len == (size_t)-2) { /* invalid sequence */ |
b8300c0a KZ |
627 | memset(&s, 0, sizeof (s)); |
628 | len = hex = 1; | |
b8300c0a KZ |
629 | } else if (len > 1 && !iswprint(wc)) { /* non-printable multibyte */ |
630 | hex = 1; | |
b8300c0a | 631 | } |
0720766e PU |
632 | i += len - 1; |
633 | #else | |
d9bdd89d | 634 | len = 1; |
0720766e PU |
635 | if (!isprint((unsigned int) *p) && |
636 | !isspace((unsigned int) *p)) /* non-printable */ | |
637 | hex = 1; | |
638 | #endif | |
b8300c0a KZ |
639 | if (hex) |
640 | rc = fwrite_hex(p, len, out); | |
641 | else | |
85f3cc55 | 642 | rc = fwrite(p, 1, len, out) != len; |
97c32789 KZ |
643 | if (rc != 0) { |
644 | if (errno != EPIPE) | |
645 | err(EXIT_FAILURE, _("write failed")); | |
646 | exit(EXIT_SUCCESS); | |
647 | } | |
b8300c0a KZ |
648 | } |
649 | } | |
650 | ||
ddca870a KZ |
651 | static const char *skip_item(const char *begin, const char *end, const char *sep) |
652 | { | |
653 | while (begin < end) { | |
654 | int c = *begin++; | |
655 | ||
656 | if (c == '\0' || strchr(sep, c)) | |
657 | break; | |
658 | } | |
659 | ||
660 | return begin; | |
661 | } | |
662 | ||
60464b1f KZ |
663 | /* |
664 | * Parses one record from syslog(2) buffer | |
665 | */ | |
7af23060 KZ |
666 | static int get_next_syslog_record(struct dmesg_control *ctl, |
667 | struct dmesg_record *rec) | |
f4fa5b44 | 668 | { |
738767b9 | 669 | size_t i; |
b8300c0a KZ |
670 | const char *begin = NULL; |
671 | ||
7af23060 KZ |
672 | if (ctl->method != DMESG_METHOD_MMAP && |
673 | ctl->method != DMESG_METHOD_SYSLOG) | |
674 | return -1; | |
675 | ||
a7ee94f2 KZ |
676 | if (!rec->next || !rec->next_size) |
677 | return 1; | |
f4fa5b44 | 678 | |
ddca870a | 679 | INIT_DMESG_RECORD(rec); |
a7ee94f2 | 680 | |
c672220f KZ |
681 | /* |
682 | * Unmap already printed file data from memory | |
683 | */ | |
684 | if (ctl->mmap_buff && (size_t) (rec->next - ctl->mmap_buff) > ctl->pagesize) { | |
685 | void *x = ctl->mmap_buff; | |
686 | ||
687 | ctl->mmap_buff += ctl->pagesize; | |
688 | munmap(x, ctl->pagesize); | |
689 | } | |
690 | ||
a7ee94f2 KZ |
691 | for (i = 0; i < rec->next_size; i++) { |
692 | const char *p = rec->next + i; | |
693 | const char *end = NULL; | |
b8300c0a KZ |
694 | |
695 | if (!begin) | |
696 | begin = p; | |
a7ee94f2 | 697 | if (i + 1 == rec->next_size) { |
b8300c0a | 698 | end = p + 1; |
f4fa5b44 | 699 | i++; |
22f69825 KZ |
700 | } else if (*p == '\n' && *(p + 1) == '<') |
701 | end = p; | |
702 | ||
a7ee94f2 KZ |
703 | if (begin && !*begin) |
704 | begin = NULL; /* zero(s) at the end of the buffer? */ | |
b8300c0a KZ |
705 | if (!begin || !end) |
706 | continue; | |
707 | if (end <= begin) | |
708 | continue; /* error or empty line? */ | |
709 | ||
636a6207 | 710 | if (*begin == '<') { |
bb901317 | 711 | if (ctl->fltr_lev || ctl->fltr_fac || ctl->decode || ctl->color) |
a7ee94f2 KZ |
712 | begin = parse_faclev(begin + 1, &rec->facility, |
713 | &rec->level); | |
ddca870a KZ |
714 | else |
715 | begin = skip_item(begin, end, ">"); | |
b8300c0a KZ |
716 | } |
717 | ||
bd304d92 KZ |
718 | if (*begin == '[' && (*(begin + 1) == ' ' || |
719 | isdigit(*(begin + 1)))) { | |
776eabe7 SK |
720 | |
721 | if (!is_timefmt(ctl, NONE)) | |
ddca870a | 722 | begin = parse_syslog_timestamp(begin + 1, &rec->tv); |
776eabe7 | 723 | else |
ddca870a KZ |
724 | begin = skip_item(begin, end, "]"); |
725 | ||
31c9099a KZ |
726 | if (begin < end && *begin == ' ') |
727 | begin++; | |
a7ee94f2 | 728 | } |
d74b8dfc | 729 | |
a7ee94f2 KZ |
730 | rec->mesg = begin; |
731 | rec->mesg_size = end - begin; | |
b8300c0a | 732 | |
a7ee94f2 KZ |
733 | rec->next_size -= end - rec->next; |
734 | rec->next = rec->next_size > 0 ? end + 1 : NULL; | |
59202950 PU |
735 | if (rec->next_size > 0) |
736 | rec->next_size--; | |
a7ee94f2 KZ |
737 | |
738 | return 0; | |
739 | } | |
740 | ||
741 | return 1; | |
742 | } | |
743 | ||
744 | static int accept_record(struct dmesg_control *ctl, struct dmesg_record *rec) | |
745 | { | |
746 | if (ctl->fltr_lev && (rec->facility < 0 || | |
747 | !isset(ctl->levels, rec->level))) | |
748 | return 0; | |
749 | ||
750 | if (ctl->fltr_fac && (rec->facility < 0 || | |
751 | !isset(ctl->facilities, rec->facility))) | |
752 | return 0; | |
753 | ||
754 | return 1; | |
755 | } | |
756 | ||
7ff1f63f | 757 | static void raw_print(struct dmesg_control *ctl, const char *buf, size_t size) |
c672220f KZ |
758 | { |
759 | int lastc = '\n'; | |
760 | ||
761 | if (!ctl->mmap_buff) { | |
762 | /* | |
763 | * Print whole ring buffer | |
764 | */ | |
765 | safe_fwrite(buf, size, stdout); | |
766 | lastc = buf[size - 1]; | |
767 | } else { | |
768 | /* | |
769 | * Print file in small chunks to save memory | |
770 | */ | |
771 | while (size) { | |
772 | size_t sz = size > ctl->pagesize ? ctl->pagesize : size; | |
773 | char *x = ctl->mmap_buff; | |
774 | ||
775 | safe_fwrite(x, sz, stdout); | |
776 | lastc = x[sz - 1]; | |
777 | size -= sz; | |
778 | ctl->mmap_buff += sz; | |
779 | munmap(x, sz); | |
780 | } | |
781 | } | |
782 | ||
783 | if (lastc != '\n') | |
784 | putchar('\n'); | |
785 | } | |
786 | ||
60464b1f KZ |
787 | static struct tm *record_localtime(struct dmesg_control *ctl, |
788 | struct dmesg_record *rec, | |
789 | struct tm *tm) | |
790 | { | |
3c5384d0 | 791 | time_t t = ctl->boot_time.tv_sec + rec->tv.tv_sec; |
60464b1f KZ |
792 | return localtime_r(&t, tm); |
793 | } | |
794 | ||
0d1b3300 KZ |
795 | static char *record_ctime(struct dmesg_control *ctl, |
796 | struct dmesg_record *rec, | |
797 | char *buf, size_t bufsiz) | |
798 | { | |
60464b1f | 799 | struct tm tm; |
0d1b3300 | 800 | |
60464b1f | 801 | record_localtime(ctl, rec, &tm); |
0d1b3300 | 802 | |
60464b1f | 803 | if (strftime(buf, bufsiz, "%a %b %e %H:%M:%S %Y", &tm) == 0) |
0d1b3300 KZ |
804 | *buf = '\0'; |
805 | return buf; | |
806 | } | |
807 | ||
60464b1f KZ |
808 | static char *short_ctime(struct tm *tm, char *buf, size_t bufsiz) |
809 | { | |
810 | if (strftime(buf, bufsiz, "%b%e %H:%M", tm) == 0) | |
811 | *buf = '\0'; | |
812 | return buf; | |
813 | } | |
814 | ||
8a8be309 SK |
815 | static char *iso_8601_time(struct dmesg_control *ctl, struct dmesg_record *rec, |
816 | char *buf, size_t bufsiz) | |
817 | { | |
818 | struct tm tm; | |
819 | size_t len; | |
820 | record_localtime(ctl, rec, &tm); | |
821 | if (strftime(buf, bufsiz, "%Y-%m-%dT%H:%M:%S", &tm) == 0) { | |
822 | *buf = '\0'; | |
823 | return buf; | |
824 | } | |
825 | len = strlen(buf); | |
826 | snprintf(buf + len, bufsiz - len, ",%06d", (int)rec->tv.tv_usec); | |
827 | len = strlen(buf); | |
828 | strftime(buf + len, bufsiz - len, "%z", &tm); | |
829 | return buf; | |
830 | } | |
831 | ||
60464b1f KZ |
832 | static double record_count_delta(struct dmesg_control *ctl, |
833 | struct dmesg_record *rec) | |
834 | { | |
835 | double delta = 0; | |
836 | ||
837 | if (timerisset(&ctl->lasttime)) | |
838 | delta = time_diff(&rec->tv, &ctl->lasttime); | |
839 | ||
840 | ctl->lasttime = rec->tv; | |
841 | return delta; | |
842 | } | |
843 | ||
5aaee63c KZ |
844 | static const char *get_subsys_delimiter(const char *mesg, size_t mesg_size) |
845 | { | |
846 | const char *p = mesg; | |
847 | size_t sz = mesg_size; | |
848 | ||
849 | while (sz > 0) { | |
850 | const char *d = strnchr(p, sz, ':'); | |
851 | if (!d) | |
852 | return NULL; | |
853 | sz -= d - p; | |
854 | if (sz) { | |
855 | if (isblank(*(d + 1))) | |
856 | return d; | |
857 | p = d + 1; | |
858 | } | |
859 | } | |
860 | return NULL; | |
861 | } | |
862 | ||
60464b1f KZ |
863 | static void print_record(struct dmesg_control *ctl, |
864 | struct dmesg_record *rec) | |
7af23060 | 865 | { |
0d1b3300 | 866 | char buf[256]; |
098ce273 | 867 | int has_color = 0; |
5aaee63c KZ |
868 | const char *mesg; |
869 | size_t mesg_size; | |
7af23060 KZ |
870 | |
871 | if (!accept_record(ctl, rec)) | |
872 | return; | |
873 | ||
874 | if (!rec->mesg_size) { | |
875 | putchar('\n'); | |
876 | return; | |
877 | } | |
878 | ||
0d1b3300 KZ |
879 | /* |
880 | * compose syslog(2) compatible raw output -- used for /dev/kmsg for | |
881 | * backward compatibility with syslog(2) buffers only | |
882 | */ | |
37b04d6c | 883 | if (ctl->raw) { |
37b04d6c KZ |
884 | printf("<%d>[%5d.%06d] ", |
885 | LOG_MAKEPRI(rec->facility, rec->level), | |
886 | (int) rec->tv.tv_sec, | |
887 | (int) rec->tv.tv_usec); | |
888 | ||
889 | goto mesg; | |
890 | } | |
891 | ||
0d1b3300 KZ |
892 | /* |
893 | * facility : priority : | |
894 | */ | |
ae6288da SK |
895 | if (ctl->decode && |
896 | -1 < rec->level && rec->level < (int) ARRAY_SIZE(level_names) && | |
897 | -1 < rec->facility && rec->facility < (int) ARRAY_SIZE(facility_names)) | |
7af23060 KZ |
898 | printf("%-6s:%-6s: ", facility_names[rec->facility].name, |
899 | level_names[rec->level].name); | |
900 | ||
776eabe7 | 901 | if (ctl->color) |
f4bc7f96 | 902 | dmesg_enable_color(DMESG_COLOR_TIME); |
0d1b3300 | 903 | |
776eabe7 | 904 | switch (ctl->time_fmt) { |
60464b1f KZ |
905 | double delta; |
906 | struct tm cur; | |
776eabe7 SK |
907 | case DMESG_TIMEFTM_NONE: |
908 | break; | |
909 | case DMESG_TIMEFTM_CTIME: | |
910 | printf("[%s] ", record_ctime(ctl, rec, buf, sizeof(buf))); | |
911 | break; | |
912 | case DMESG_TIMEFTM_CTIME_DELTA: | |
913 | printf("[%s <%12.06f>] ", | |
914 | record_ctime(ctl, rec, buf, sizeof(buf)), | |
915 | record_count_delta(ctl, rec)); | |
916 | break; | |
917 | case DMESG_TIMEFTM_DELTA: | |
918 | printf("[<%12.06f>] ", record_count_delta(ctl, rec)); | |
919 | break; | |
920 | case DMESG_TIMEFTM_RELTIME: | |
60464b1f KZ |
921 | record_localtime(ctl, rec, &cur); |
922 | delta = record_count_delta(ctl, rec); | |
776eabe7 | 923 | if (cur.tm_min != ctl->lasttm.tm_min || |
60464b1f | 924 | cur.tm_hour != ctl->lasttm.tm_hour || |
5aaee63c | 925 | cur.tm_yday != ctl->lasttm.tm_yday) { |
33ecab2b | 926 | dmesg_enable_color(DMESG_COLOR_TIMEBREAK); |
60464b1f | 927 | printf("[%s] ", short_ctime(&cur, buf, sizeof(buf))); |
5aaee63c | 928 | } else { |
5aaee63c KZ |
929 | if (delta < 10) |
930 | printf("[ %+8.06f] ", delta); | |
931 | else | |
932 | printf("[ %+9.06f] ", delta); | |
933 | } | |
60464b1f | 934 | ctl->lasttm = cur; |
776eabe7 SK |
935 | break; |
936 | case DMESG_TIMEFTM_TIME: | |
937 | printf("[%5d.%06d] ", (int)rec->tv.tv_sec, (int)rec->tv.tv_usec); | |
938 | break; | |
939 | case DMESG_TIMEFTM_TIME_DELTA: | |
940 | printf("[%5d.%06d <%12.06f>] ", (int)rec->tv.tv_sec, | |
941 | (int)rec->tv.tv_usec, record_count_delta(ctl, rec)); | |
942 | break; | |
8a8be309 SK |
943 | case DMESG_TIMEFTM_ISO8601: |
944 | printf("%s ", iso_8601_time(ctl, rec, buf, sizeof(buf))); | |
945 | break; | |
776eabe7 SK |
946 | default: |
947 | abort(); | |
60464b1f | 948 | } |
7af23060 | 949 | |
776eabe7 SK |
950 | if (ctl->color) |
951 | color_disable(); | |
ddca870a | 952 | |
37b04d6c | 953 | mesg: |
5aaee63c KZ |
954 | mesg = rec->mesg; |
955 | mesg_size = rec->mesg_size; | |
956 | ||
957 | /* Colorize output */ | |
958 | if (ctl->color) { | |
959 | /* subsystem prefix */ | |
960 | const char *subsys = get_subsys_delimiter(mesg, mesg_size); | |
961 | if (subsys) { | |
f4bc7f96 | 962 | dmesg_enable_color(DMESG_COLOR_SUBSYS); |
5aaee63c KZ |
963 | safe_fwrite(mesg, subsys - mesg, stdout); |
964 | color_disable(); | |
965 | ||
966 | mesg_size -= subsys - mesg; | |
967 | mesg = subsys; | |
968 | } | |
969 | /* error, alert .. etc. colors */ | |
970 | has_color = set_level_color(rec->level, mesg, mesg_size) == 0; | |
971 | safe_fwrite(mesg, mesg_size, stdout); | |
972 | if (has_color) | |
973 | color_disable(); | |
974 | } else | |
975 | safe_fwrite(mesg, mesg_size, stdout); | |
098ce273 | 976 | |
5aaee63c | 977 | if (*(mesg + mesg_size - 1) != '\n') |
7af23060 KZ |
978 | putchar('\n'); |
979 | } | |
980 | ||
a7ee94f2 KZ |
981 | /* |
982 | * Prints the 'buf' kernel ring buffer; the messages are filtered out according | |
983 | * to 'levels' and 'facilities' bitarrays. | |
984 | */ | |
7ff1f63f KZ |
985 | static void print_buffer(struct dmesg_control *ctl, |
986 | const char *buf, size_t size) | |
a7ee94f2 KZ |
987 | { |
988 | struct dmesg_record rec = { .next = buf, .next_size = size }; | |
989 | ||
990 | if (ctl->raw) { | |
7ff1f63f | 991 | raw_print(ctl, buf, size); |
a7ee94f2 KZ |
992 | return; |
993 | } | |
994 | ||
7af23060 KZ |
995 | while (get_next_syslog_record(ctl, &rec) == 0) |
996 | print_record(ctl, &rec); | |
997 | } | |
a7ee94f2 | 998 | |
4ceb601d MB |
999 | static ssize_t read_kmsg_one(struct dmesg_control *ctl) |
1000 | { | |
1001 | ssize_t size; | |
1002 | ||
1003 | /* kmsg returns EPIPE if record was modified while reading */ | |
1004 | do { | |
1005 | size = read(ctl->kmsg, ctl->kmsg_buf, | |
1006 | sizeof(ctl->kmsg_buf) - 1); | |
1007 | } while (size < 0 && errno == EPIPE); | |
1008 | ||
1009 | return size; | |
1010 | } | |
1011 | ||
7af23060 KZ |
1012 | static int init_kmsg(struct dmesg_control *ctl) |
1013 | { | |
0fd12a96 KZ |
1014 | int mode = O_RDONLY; |
1015 | ||
1016 | if (!ctl->follow) | |
1017 | mode |= O_NONBLOCK; | |
3938c08c KZ |
1018 | else |
1019 | setlinebuf(stdout); | |
0fd12a96 KZ |
1020 | |
1021 | ctl->kmsg = open("/dev/kmsg", mode); | |
c677ffba KZ |
1022 | if (ctl->kmsg < 0) |
1023 | return -1; | |
1024 | ||
1025 | /* | |
1026 | * Seek after the last record available at the time | |
1027 | * the last SYSLOG_ACTION_CLEAR was issued. | |
1028 | * | |
1029 | * ... otherwise SYSLOG_ACTION_CLEAR will have no effect for kmsg. | |
1030 | */ | |
1031 | lseek(ctl->kmsg, 0, SEEK_DATA); | |
298a073c KZ |
1032 | |
1033 | /* | |
1034 | * Old kernels (<3.5) allow to successfully open /dev/kmsg for | |
1035 | * read-only, but read() returns -EINVAL :-((( | |
1036 | * | |
1037 | * Let's try to read the first record. The record is later processed in | |
1038 | * read_kmsg(). | |
1039 | */ | |
4ceb601d | 1040 | ctl->kmsg_first_read = read_kmsg_one(ctl); |
298a073c KZ |
1041 | if (ctl->kmsg_first_read < 0) { |
1042 | close(ctl->kmsg); | |
1043 | ctl->kmsg = -1; | |
1044 | return -1; | |
1045 | } | |
1046 | ||
c677ffba | 1047 | return 0; |
f4fa5b44 KZ |
1048 | } |
1049 | ||
ddca870a KZ |
1050 | /* |
1051 | * /dev/kmsg record format: | |
1052 | * | |
1053 | * faclev,seqnum,timestamp[optional, ...];messgage\n | |
1054 | * TAGNAME=value | |
1055 | * ... | |
1056 | * | |
1057 | * - fields are separated by ',' | |
1058 | * - last field is terminated by ';' | |
1059 | * | |
1060 | */ | |
1061 | #define LAST_KMSG_FIELD(s) (!s || !*s || *(s - 1) == ';') | |
1062 | ||
1063 | static int parse_kmsg_record(struct dmesg_control *ctl, | |
1064 | struct dmesg_record *rec, | |
1065 | char *buf, | |
1066 | size_t sz) | |
1067 | { | |
1068 | const char *p = buf, *end; | |
1069 | ||
1070 | if (sz == 0 || !buf || !*buf) | |
1071 | return -1; | |
1072 | ||
1073 | end = buf + (sz - 1); | |
1074 | INIT_DMESG_RECORD(rec); | |
1075 | ||
1076 | while (p < end && isspace(*p)) | |
1077 | p++; | |
1078 | ||
1079 | /* A) priority and facility */ | |
098ce273 OO |
1080 | if (ctl->fltr_lev || ctl->fltr_fac || ctl->decode || |
1081 | ctl->raw || ctl->color) | |
ddca870a KZ |
1082 | p = parse_faclev(p, &rec->facility, &rec->level); |
1083 | else | |
1084 | p = skip_item(p, end, ","); | |
1085 | if (LAST_KMSG_FIELD(p)) | |
1086 | goto mesg; | |
1087 | ||
1088 | /* B) sequence number */ | |
1089 | p = skip_item(p, end, ",;"); | |
1090 | if (LAST_KMSG_FIELD(p)) | |
1091 | goto mesg; | |
1092 | ||
1093 | /* C) timestamp */ | |
776eabe7 | 1094 | if (is_timefmt(ctl, NONE)) |
ddca870a KZ |
1095 | p = skip_item(p, end, ",;"); |
1096 | else | |
1097 | p = parse_kmsg_timestamp(p, &rec->tv); | |
1098 | if (LAST_KMSG_FIELD(p)) | |
1099 | goto mesg; | |
1100 | ||
1101 | /* D) optional fields (ignore) */ | |
1102 | p = skip_item(p, end, ";"); | |
1103 | if (LAST_KMSG_FIELD(p)) | |
1104 | goto mesg; | |
1105 | ||
1106 | mesg: | |
1107 | /* E) message text */ | |
1108 | rec->mesg = p; | |
1109 | p = skip_item(p, end, "\n"); | |
1110 | ||
1111 | if (!p) | |
1112 | return -1; | |
1113 | ||
1114 | rec->mesg_size = p - rec->mesg; | |
1115 | ||
1116 | /* | |
1117 | * Kernel escapes non-printable characters, unfortuately kernel | |
1118 | * definition of "non-printable" is too strict. On UTF8 console we can | |
1119 | * print many chars, so let's decode from kernel. | |
1120 | */ | |
1121 | unhexmangle_to_buffer(rec->mesg, (char *) rec->mesg, rec->mesg_size + 1); | |
1122 | ||
1123 | /* F) message tags (ignore) */ | |
1124 | ||
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Note that each read() call for /dev/kmsg returns always one record. It means | |
1130 | * that we don't have to read whole message buffer before the records parsing. | |
1131 | * | |
1132 | * So this function does not compose one huge buffer (like read_syslog_buffer()) | |
1133 | * and print_buffer() is unnecessary. All is done in this function. | |
1134 | * | |
1135 | * Returns 0 on success, -1 on error. | |
1136 | */ | |
1137 | static int read_kmsg(struct dmesg_control *ctl) | |
1138 | { | |
ddca870a | 1139 | struct dmesg_record rec; |
298a073c | 1140 | ssize_t sz; |
ddca870a KZ |
1141 | |
1142 | if (ctl->method != DMESG_METHOD_KMSG || ctl->kmsg < 0) | |
1143 | return -1; | |
1144 | ||
298a073c KZ |
1145 | /* |
1146 | * The very first read() call is done in kmsg_init() where we test | |
1147 | * /dev/kmsg usability. The return code from the initial read() is | |
1148 | * stored in ctl->kmsg_first_read; | |
1149 | */ | |
1150 | sz = ctl->kmsg_first_read; | |
ddca870a | 1151 | |
298a073c KZ |
1152 | while (sz > 0) { |
1153 | *(ctl->kmsg_buf + sz) = '\0'; /* for debug messages */ | |
ddca870a | 1154 | |
298a073c KZ |
1155 | if (parse_kmsg_record(ctl, &rec, |
1156 | ctl->kmsg_buf, (size_t) sz) == 0) | |
1157 | print_record(ctl, &rec); | |
37b04d6c | 1158 | |
4ceb601d | 1159 | sz = read_kmsg_one(ctl); |
298a073c | 1160 | } |
ddca870a KZ |
1161 | |
1162 | return 0; | |
1163 | } | |
1164 | ||
babf605d SK |
1165 | static int which_time_format(const char *optarg) |
1166 | { | |
1167 | if (!strcmp(optarg, "notime")) | |
1168 | return DMESG_TIMEFTM_NONE; | |
1169 | if (!strcmp(optarg, "ctime")) | |
1170 | return DMESG_TIMEFTM_CTIME; | |
1171 | if (!strcmp(optarg, "delta")) | |
1172 | return DMESG_TIMEFTM_DELTA; | |
1173 | if (!strcmp(optarg, "reltime")) | |
1174 | return DMESG_TIMEFTM_RELTIME; | |
8a8be309 SK |
1175 | if (!strcmp(optarg, "iso")) |
1176 | return DMESG_TIMEFTM_ISO8601; | |
babf605d SK |
1177 | errx(EXIT_FAILURE, _("unknown time format: %s"), optarg); |
1178 | } | |
1179 | ||
15103c4b MP |
1180 | int main(int argc, char *argv[]) |
1181 | { | |
1182 | char *buf = NULL; | |
aa192520 | 1183 | int c, nopager = 0; |
48c5c662 | 1184 | int console_level = 0; |
6e9b06cc | 1185 | int klog_rc = 0; |
776eabe7 | 1186 | int delta = 0; |
6e9b06cc | 1187 | ssize_t n; |
9b3a6984 | 1188 | static struct dmesg_control ctl = { |
e6471b9f | 1189 | .filename = NULL, |
7ff1f63f | 1190 | .action = SYSLOG_ACTION_READ_ALL, |
ed61acc2 | 1191 | .method = DMESG_METHOD_KMSG, |
7af23060 | 1192 | .kmsg = -1, |
776eabe7 | 1193 | .time_fmt = DMESG_TIMEFTM_TIME, |
9b3a6984 | 1194 | }; |
d0c9ddc3 | 1195 | int colormode = UL_COLORMODE_UNDEF; |
babf605d SK |
1196 | enum { |
1197 | OPT_TIME_FORMAT = CHAR_MAX + 1, | |
1198 | }; | |
6dbe3af9 | 1199 | |
4a3b7949 | 1200 | static const struct option longopts[] = { |
4a3b7949 | 1201 | { "buffer-size", required_argument, NULL, 's' }, |
5ef05369 | 1202 | { "clear", no_argument, NULL, 'C' }, |
9bc2b51a | 1203 | { "color", optional_argument, NULL, 'L' }, |
4a3b7949 | 1204 | { "console-level", required_argument, NULL, 'n' }, |
bd304d92 KZ |
1205 | { "console-off", no_argument, NULL, 'D' }, |
1206 | { "console-on", no_argument, NULL, 'E' }, | |
5ef05369 | 1207 | { "decode", no_argument, NULL, 'x' }, |
c672220f | 1208 | { "file", required_argument, NULL, 'F' }, |
0e24df3b | 1209 | { "facility", required_argument, NULL, 'f' }, |
0fd12a96 | 1210 | { "follow", no_argument, NULL, 'w' }, |
f0a3a1ca | 1211 | { "human", no_argument, NULL, 'H' }, |
4a3b7949 | 1212 | { "help", no_argument, NULL, 'h' }, |
25000180 | 1213 | { "kernel", no_argument, NULL, 'k' }, |
5ef05369 | 1214 | { "level", required_argument, NULL, 'l' }, |
ed61acc2 | 1215 | { "syslog", no_argument, NULL, 'S' }, |
5ef05369 KZ |
1216 | { "raw", no_argument, NULL, 'r' }, |
1217 | { "read-clear", no_argument, NULL, 'c' }, | |
60464b1f | 1218 | { "reltime", no_argument, NULL, 'e' }, |
bd304d92 | 1219 | { "show-delta", no_argument, NULL, 'd' }, |
42fac79a | 1220 | { "ctime", no_argument, NULL, 'T' }, |
d74b8dfc | 1221 | { "notime", no_argument, NULL, 't' }, |
aa192520 | 1222 | { "nopager", no_argument, NULL, 'P' }, |
25000180 | 1223 | { "userspace", no_argument, NULL, 'u' }, |
5ef05369 | 1224 | { "version", no_argument, NULL, 'V' }, |
babf605d | 1225 | { "time-format", required_argument, NULL, OPT_TIME_FORMAT }, |
4a3b7949 KZ |
1226 | { NULL, 0, NULL, 0 } |
1227 | }; | |
1228 | ||
43d2eeef | 1229 | static const ul_excl_t excl[] = { /* rows and cols in in ASCII order */ |
1a38ad5c | 1230 | { 'C','D','E','c','n','r' }, /* clear,off,on,read-clear,level,raw*/ |
f0a3a1ca | 1231 | { 'H','r' }, /* human, raw */ |
5aaee63c | 1232 | { 'L','r' }, /* color, raw */ |
43d2eeef | 1233 | { 'S','w' }, /* syslog,follow */ |
1a38ad5c KZ |
1234 | { 'T','r' }, /* ctime, raw */ |
1235 | { 'd','r' }, /* delta, raw */ | |
1236 | { 'e','r' }, /* reltime, raw */ | |
1237 | { 'r','x' }, /* raw, decode */ | |
1238 | { 'r','t' }, /* notime, raw */ | |
43d2eeef KZ |
1239 | { 0 } |
1240 | }; | |
1241 | int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT; | |
1242 | ||
df1dddf9 KZ |
1243 | setlocale(LC_ALL, ""); |
1244 | bindtextdomain(PACKAGE, LOCALEDIR); | |
1245 | textdomain(PACKAGE); | |
efb8854f | 1246 | atexit(close_stdout); |
7eda085c | 1247 | |
9bc2b51a | 1248 | while ((c = getopt_long(argc, argv, "CcDdEeF:f:HhkL::l:n:iPrSs:TtuVwx", |
aca1633a | 1249 | longopts, NULL)) != -1) { |
43d2eeef KZ |
1250 | |
1251 | err_exclusive_options(c, longopts, excl, excl_st); | |
1252 | ||
df1dddf9 | 1253 | switch (c) { |
04199860 | 1254 | case 'C': |
e6471b9f | 1255 | ctl.action = SYSLOG_ACTION_CLEAR; |
04199860 | 1256 | break; |
df1dddf9 | 1257 | case 'c': |
e6471b9f | 1258 | ctl.action = SYSLOG_ACTION_READ_CLEAR; |
df1dddf9 | 1259 | break; |
bd304d92 | 1260 | case 'D': |
e6471b9f | 1261 | ctl.action = SYSLOG_ACTION_CONSOLE_OFF; |
2170174e | 1262 | break; |
bd304d92 | 1263 | case 'd': |
776eabe7 | 1264 | delta = 1; |
bd304d92 KZ |
1265 | break; |
1266 | case 'E': | |
e6471b9f | 1267 | ctl.action = SYSLOG_ACTION_CONSOLE_ON; |
2170174e | 1268 | break; |
60464b1f | 1269 | case 'e': |
776eabe7 | 1270 | ctl.time_fmt = DMESG_TIMEFTM_RELTIME; |
60464b1f | 1271 | break; |
c672220f | 1272 | case 'F': |
9b3a6984 | 1273 | ctl.filename = optarg; |
e6471b9f | 1274 | ctl.method = DMESG_METHOD_MMAP; |
c672220f | 1275 | break; |
0e24df3b | 1276 | case 'f': |
aca1633a | 1277 | ctl.fltr_fac = 1; |
c87638ad KZ |
1278 | if (string_to_bitarray(optarg, |
1279 | ctl.facilities, parse_facility) < 0) | |
1280 | return EXIT_FAILURE; | |
0e24df3b | 1281 | break; |
f0a3a1ca | 1282 | case 'H': |
776eabe7 | 1283 | ctl.time_fmt = DMESG_TIMEFTM_RELTIME; |
81bd88e4 | 1284 | colormode = UL_COLORMODE_AUTO; |
aa192520 | 1285 | ctl.pager = 1; |
f0a3a1ca | 1286 | break; |
5ef05369 KZ |
1287 | case 'h': |
1288 | usage(stdout); | |
df1dddf9 | 1289 | break; |
25000180 | 1290 | case 'k': |
aca1633a KZ |
1291 | ctl.fltr_fac = 1; |
1292 | setbit(ctl.facilities, FAC_BASE(LOG_KERN)); | |
25000180 | 1293 | break; |
098ce273 | 1294 | case 'L': |
9bc2b51a | 1295 | colormode = UL_COLORMODE_AUTO; |
b7faf991 KZ |
1296 | if (optarg) |
1297 | colormode = colormode_or_err(optarg, | |
1298 | _("unsupported color mode")); | |
098ce273 | 1299 | break; |
636a6207 | 1300 | case 'l': |
aca1633a | 1301 | ctl.fltr_lev= 1; |
c87638ad KZ |
1302 | if (string_to_bitarray(optarg, |
1303 | ctl.levels, parse_level) < 0) | |
1304 | return EXIT_FAILURE; | |
636a6207 | 1305 | break; |
5ef05369 | 1306 | case 'n': |
e6471b9f | 1307 | ctl.action = SYSLOG_ACTION_CONSOLE_LEVEL; |
5ef05369 KZ |
1308 | console_level = parse_level(optarg, 0); |
1309 | break; | |
aa192520 KZ |
1310 | case 'P': |
1311 | nopager = 1; | |
1312 | break; | |
11ea22d5 | 1313 | case 'r': |
aca1633a | 1314 | ctl.raw = 1; |
11ea22d5 | 1315 | break; |
ed61acc2 KZ |
1316 | case 'S': |
1317 | ctl.method = DMESG_METHOD_SYSLOG; | |
1318 | break; | |
df1dddf9 | 1319 | case 's': |
e6471b9f KZ |
1320 | ctl.bufsize = strtou32_or_err(optarg, |
1321 | _("invalid buffer size argument")); | |
1322 | if (ctl.bufsize < 4096) | |
1323 | ctl.bufsize = 4096; | |
df1dddf9 | 1324 | break; |
42fac79a | 1325 | case 'T': |
776eabe7 | 1326 | ctl.time_fmt = DMESG_TIMEFTM_CTIME; |
42fac79a | 1327 | break; |
d74b8dfc | 1328 | case 't': |
776eabe7 SK |
1329 | ctl.time_fmt = DMESG_TIMEFTM_NONE; |
1330 | delta = 0; | |
d74b8dfc | 1331 | break; |
25000180 | 1332 | case 'u': |
aca1633a | 1333 | ctl.fltr_fac = 1; |
738767b9 | 1334 | for (n = 1; (size_t) n < ARRAY_SIZE(facility_names); n++) |
aca1633a | 1335 | setbit(ctl.facilities, n); |
25000180 | 1336 | break; |
4a3b7949 | 1337 | case 'V': |
f6277500 | 1338 | printf(UTIL_LINUX_VERSION); |
4a3b7949 | 1339 | return EXIT_SUCCESS; |
0fd12a96 | 1340 | case 'w': |
0fd12a96 KZ |
1341 | ctl.follow = 1; |
1342 | break; | |
5ef05369 | 1343 | case 'x': |
aca1633a | 1344 | ctl.decode = 1; |
4a3b7949 | 1345 | break; |
babf605d SK |
1346 | case OPT_TIME_FORMAT: |
1347 | ctl.time_fmt = which_time_format(optarg); | |
1348 | break; | |
df1dddf9 KZ |
1349 | case '?': |
1350 | default: | |
4a3b7949 | 1351 | usage(stderr); |
df1dddf9 KZ |
1352 | } |
1353 | } | |
1354 | argc -= optind; | |
1355 | argv += optind; | |
e6c379eb | 1356 | |
15103c4b | 1357 | if (argc > 1) |
4a3b7949 | 1358 | usage(stderr); |
6dbe3af9 | 1359 | |
15a1e371 KZ |
1360 | if (is_timefmt(&ctl, RELTIME) || |
1361 | is_timefmt(&ctl, CTIME) || | |
1362 | is_timefmt(&ctl, ISO8601)) { | |
1363 | ||
3c5384d0 | 1364 | if (get_boot_time(&ctl.boot_time) != 0) |
776eabe7 | 1365 | ctl.time_fmt = DMESG_TIMEFTM_NONE; |
f0a3a1ca | 1366 | } |
9bc2b51a | 1367 | |
776eabe7 SK |
1368 | if (delta) |
1369 | switch (ctl.time_fmt) { | |
1370 | case DMESG_TIMEFTM_CTIME: | |
1371 | ctl.time_fmt = DMESG_TIMEFTM_CTIME_DELTA; | |
1372 | break; | |
1373 | case DMESG_TIMEFTM_TIME: | |
1374 | ctl.time_fmt = DMESG_TIMEFTM_TIME_DELTA; | |
1375 | break; | |
e7ba987a SK |
1376 | case DMESG_TIMEFTM_ISO8601: |
1377 | warnx(_("--show-delta is ignored when used together with iso8601 time format")); | |
1378 | break; | |
776eabe7 SK |
1379 | default: |
1380 | ctl.time_fmt = DMESG_TIMEFTM_DELTA; | |
1381 | } | |
1382 | ||
776eabe7 | 1383 | |
d0c9ddc3 | 1384 | ctl.color = colors_init(colormode, "dmesg") ? 1 : 0; |
5042cdcf KZ |
1385 | if (ctl.follow) |
1386 | nopager = 1; | |
aa192520 KZ |
1387 | ctl.pager = nopager ? 0 : ctl.pager; |
1388 | if (ctl.pager) | |
1389 | setup_pager(); | |
1390 | ||
e6471b9f | 1391 | switch (ctl.action) { |
48c5c662 KZ |
1392 | case SYSLOG_ACTION_READ_ALL: |
1393 | case SYSLOG_ACTION_READ_CLEAR: | |
7af23060 KZ |
1394 | if (ctl.method == DMESG_METHOD_KMSG && init_kmsg(&ctl) != 0) |
1395 | ctl.method = DMESG_METHOD_SYSLOG; | |
1a38ad5c KZ |
1396 | |
1397 | if (ctl.raw | |
1398 | && ctl.method != DMESG_METHOD_KMSG | |
1399 | && (ctl.fltr_lev || ctl.fltr_fac)) | |
62698149 BS |
1400 | errx(EXIT_FAILURE, _("--raw can be used together with --level or " |
1401 | "--facility only when reading messages from /dev/kmsg")); | |
aa192520 KZ |
1402 | if (ctl.pager) |
1403 | setup_pager(); | |
6e9b06cc KZ |
1404 | n = read_buffer(&ctl, &buf); |
1405 | if (n > 0) | |
1406 | print_buffer(&ctl, buf, n); | |
7ff1f63f | 1407 | if (!ctl.mmap_buff) |
c672220f | 1408 | free(buf); |
6e9b06cc KZ |
1409 | if (n < 0) |
1410 | err(EXIT_FAILURE, _("read kernel buffer failed")); | |
1411 | if (ctl.kmsg >= 0) | |
1412 | close(ctl.kmsg); | |
48c5c662 | 1413 | break; |
04199860 | 1414 | case SYSLOG_ACTION_CLEAR: |
2170174e KZ |
1415 | case SYSLOG_ACTION_CONSOLE_OFF: |
1416 | case SYSLOG_ACTION_CONSOLE_ON: | |
6e9b06cc | 1417 | klog_rc = klogctl(ctl.action, NULL, 0); |
04199860 | 1418 | break; |
48c5c662 | 1419 | case SYSLOG_ACTION_CONSOLE_LEVEL: |
6e9b06cc | 1420 | klog_rc = klogctl(ctl.action, NULL, console_level); |
48c5c662 KZ |
1421 | break; |
1422 | default: | |
1423 | errx(EXIT_FAILURE, _("unsupported command")); | |
1424 | break; | |
df1dddf9 | 1425 | } |
6dbe3af9 | 1426 | |
7af23060 | 1427 | |
6e9b06cc | 1428 | if (klog_rc) |
15103c4b | 1429 | err(EXIT_FAILURE, _("klogctl failed")); |
6dbe3af9 | 1430 | |
15103c4b | 1431 | return EXIT_SUCCESS; |
6dbe3af9 | 1432 | } |