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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 <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" |
ddca870a | 35 | #include "mangle.h" |
aa192520 | 36 | #include "pager.h" |
6dbe3af9 | 37 | |
59a14899 KZ |
38 | /* Close the log. Currently a NOP. */ |
39 | #define SYSLOG_ACTION_CLOSE 0 | |
40 | /* Open the log. Currently a NOP. */ | |
41 | #define SYSLOG_ACTION_OPEN 1 | |
42 | /* Read from the log. */ | |
43 | #define SYSLOG_ACTION_READ 2 | |
44 | /* Read all messages remaining in the ring buffer. (allowed for non-root) */ | |
45 | #define SYSLOG_ACTION_READ_ALL 3 | |
46 | /* Read and clear all messages remaining in the ring buffer */ | |
47 | #define SYSLOG_ACTION_READ_CLEAR 4 | |
48 | /* Clear ring buffer. */ | |
49 | #define SYSLOG_ACTION_CLEAR 5 | |
50 | /* Disable printk's to console */ | |
51 | #define SYSLOG_ACTION_CONSOLE_OFF 6 | |
52 | /* Enable printk's to console */ | |
53 | #define SYSLOG_ACTION_CONSOLE_ON 7 | |
54 | /* Set level of messages printed to console */ | |
55 | #define SYSLOG_ACTION_CONSOLE_LEVEL 8 | |
56 | /* Return number of unread characters in the log buffer */ | |
57 | #define SYSLOG_ACTION_SIZE_UNREAD 9 | |
58 | /* Return size of the log buffer */ | |
59 | #define SYSLOG_ACTION_SIZE_BUFFER 10 | |
60 | ||
5aaee63c KZ |
61 | /* |
62 | * Colors | |
63 | */ | |
64 | #define DMESG_COLOR_SUBSYS UL_COLOR_BROWN | |
65 | #define DMESG_COLOR_TIME UL_COLOR_GREEN | |
66 | #define DMESG_COLOR_RELTIME UL_COLOR_BOLD_GREEN | |
67 | #define DMESG_COLOR_ALERT UL_COLOR_REVERSE UL_COLOR_RED | |
68 | #define DMESG_COLOR_CRIT UL_COLOR_BOLD_RED | |
69 | #define DMESG_COLOR_ERR UL_COLOR_RED | |
70 | #define DMESG_COLOR_WARN UL_COLOR_BOLD | |
71 | #define DMESG_COLOR_SEGFAULT UL_COLOR_HALFBRIGHT UL_COLOR_RED | |
72 | ||
f06ec64f | 73 | /* |
5ef05369 | 74 | * Priority and facility names |
f06ec64f KZ |
75 | */ |
76 | struct dmesg_name { | |
77 | const char *name; | |
78 | const char *help; | |
79 | }; | |
80 | ||
5ef05369 KZ |
81 | /* |
82 | * Priority names -- based on sys/syslog.h | |
83 | */ | |
f06ec64f KZ |
84 | static const struct dmesg_name level_names[] = |
85 | { | |
86 | [LOG_EMERG] = { "emerg", N_("system is unusable") }, | |
87 | [LOG_ALERT] = { "alert", N_("action must be taken immediately") }, | |
88 | [LOG_CRIT] = { "crit", N_("critical conditions") }, | |
89 | [LOG_ERR] = { "err", N_("error conditions") }, | |
90 | [LOG_WARNING] = { "warn", N_("warning conditions") }, | |
91 | [LOG_NOTICE] = { "notice",N_("normal but significant condition") }, | |
92 | [LOG_INFO] = { "info", N_("informational") }, | |
93 | [LOG_DEBUG] = { "debug", N_("debug-level messages") } | |
94 | }; | |
95 | ||
85f3cc55 KZ |
96 | /* |
97 | * sys/syslog.h uses (f << 3) for all facility codes. | |
98 | * We want to use the codes as array idexes, so shift back... | |
99 | * | |
100 | * Note that libc LOG_FAC() macro returns the base codes, not the | |
101 | * shifted code :-) | |
102 | */ | |
103 | #define FAC_BASE(f) ((f) >> 3) | |
104 | ||
105 | static const struct dmesg_name facility_names[] = | |
106 | { | |
107 | [FAC_BASE(LOG_KERN)] = { "kern", N_("kernel messages") }, | |
108 | [FAC_BASE(LOG_USER)] = { "user", N_("random user-level messages") }, | |
109 | [FAC_BASE(LOG_MAIL)] = { "mail", N_("mail system") }, | |
110 | [FAC_BASE(LOG_DAEMON)] = { "daemon", N_("system daemons") }, | |
111 | [FAC_BASE(LOG_AUTH)] = { "auth", N_("security/authorization messages") }, | |
112 | [FAC_BASE(LOG_SYSLOG)] = { "syslog", N_("messages generated internally by syslogd") }, | |
113 | [FAC_BASE(LOG_LPR)] = { "lpr", N_("line printer subsystem") }, | |
114 | [FAC_BASE(LOG_NEWS)] = { "news", N_("network news subsystem") }, | |
115 | [FAC_BASE(LOG_UUCP)] = { "uucp", N_("UUCP subsystem") }, | |
116 | [FAC_BASE(LOG_CRON)] = { "cron", N_("clock daemon") }, | |
117 | [FAC_BASE(LOG_AUTHPRIV)] = { "authpriv", N_("security/authorization messages (private)") }, | |
118 | [FAC_BASE(LOG_FTP)] = { "ftp", N_("ftp daemon") }, | |
119 | }; | |
120 | ||
e6471b9f KZ |
121 | /* supported methods to read message buffer |
122 | */ | |
123 | enum { | |
7af23060 | 124 | DMESG_METHOD_KMSG, /* read messages from /dev/kmsg (default) */ |
e6471b9f KZ |
125 | DMESG_METHOD_SYSLOG, /* klogctl() buffer */ |
126 | DMESG_METHOD_MMAP /* mmap file with records (see --file) */ | |
127 | }; | |
128 | ||
aca1633a KZ |
129 | struct dmesg_control { |
130 | /* bit arrays -- see include/bitops.h */ | |
131 | char levels[ARRAY_SIZE(level_names) / NBBY + 1]; | |
132 | char facilities[ARRAY_SIZE(facility_names) / NBBY + 1]; | |
133 | ||
bd304d92 | 134 | struct timeval lasttime; /* last printed timestamp */ |
60464b1f | 135 | struct tm lasttm; /* last localtime */ |
42fac79a | 136 | time_t boot_time; /* system boot time */ |
bd304d92 | 137 | |
e6471b9f KZ |
138 | int action; /* SYSLOG_ACTION_* */ |
139 | int method; /* DMESG_METHOD_* */ | |
298a073c KZ |
140 | |
141 | size_t bufsize; /* size of syslog buffer */ | |
142 | ||
7af23060 | 143 | int kmsg; /* /dev/kmsg file descriptor */ |
298a073c KZ |
144 | ssize_t kmsg_first_read;/* initial read() return code */ |
145 | char kmsg_buf[BUFSIZ];/* buffer to read kmsg data */ | |
e6471b9f | 146 | |
c672220f KZ |
147 | /* |
148 | * For the --file option we mmap whole file. The unnecessary (already | |
149 | * printed) pages are always unmapped. The result is that we have in | |
455fe9a0 | 150 | * memory only the currently used page(s). |
c672220f | 151 | */ |
9b3a6984 | 152 | char *filename; |
c672220f KZ |
153 | char *mmap_buff; |
154 | size_t pagesize; | |
155 | ||
0fd12a96 KZ |
156 | unsigned int follow:1, /* wait for new messages */ |
157 | raw:1, /* raw mode */ | |
9feec79c KZ |
158 | fltr_lev:1, /* filter out by levels[] */ |
159 | fltr_fac:1, /* filter out by facilities[] */ | |
160 | decode:1, /* use "facility: level: " prefix */ | |
161 | notime:1, /* don't print timestamp */ | |
162 | delta:1, /* show time deltas */ | |
60464b1f | 163 | reltime:1, /* show human readable relative times */ |
098ce273 | 164 | ctime:1, /* show human readable time */ |
aa192520 | 165 | pager:1, /* pipe output into a pager */ |
098ce273 | 166 | color:1; /* colorize messages */ |
aca1633a | 167 | }; |
f4fa5b44 | 168 | |
a7ee94f2 KZ |
169 | struct dmesg_record { |
170 | const char *mesg; | |
171 | size_t mesg_size; | |
172 | ||
173 | int level; | |
174 | int facility; | |
bd304d92 | 175 | struct timeval tv; |
a7ee94f2 KZ |
176 | |
177 | const char *next; /* buffer with next unparsed record */ | |
178 | size_t next_size; /* size of the next buffer */ | |
179 | }; | |
180 | ||
ddca870a KZ |
181 | #define INIT_DMESG_RECORD(_r) do { \ |
182 | (_r)->mesg = NULL; \ | |
183 | (_r)->mesg_size = 0; \ | |
184 | (_r)->facility = -1; \ | |
185 | (_r)->level = -1; \ | |
186 | (_r)->tv.tv_sec = 0; \ | |
187 | (_r)->tv.tv_usec = 0; \ | |
188 | } while (0) | |
189 | ||
190 | static int read_kmsg(struct dmesg_control *ctl); | |
191 | ||
5aaee63c | 192 | static int set_level_color(int log_level, const char *mesg, size_t mesgsz) |
098ce273 OO |
193 | { |
194 | switch (log_level) { | |
195 | case LOG_ALERT: | |
5aaee63c | 196 | color_enable(DMESG_COLOR_ALERT); |
098ce273 OO |
197 | return 0; |
198 | case LOG_CRIT: | |
5aaee63c | 199 | color_enable(DMESG_COLOR_CRIT); |
098ce273 OO |
200 | return 0; |
201 | case LOG_ERR: | |
5aaee63c KZ |
202 | color_enable(DMESG_COLOR_ERR); |
203 | return 0; | |
204 | case LOG_WARNING: | |
205 | color_enable(DMESG_COLOR_WARN); | |
098ce273 OO |
206 | return 0; |
207 | default: | |
208 | break; | |
209 | } | |
210 | ||
5aaee63c KZ |
211 | /* well, sometimes the messges contains important keywords, but in |
212 | * non-warning/error messages | |
213 | */ | |
214 | if (memmem(mesg, mesgsz, "segfault at", 11)) { | |
215 | color_enable(DMESG_COLOR_SEGFAULT); | |
216 | return 0; | |
217 | } | |
218 | ||
098ce273 OO |
219 | return 1; |
220 | } | |
ddca870a | 221 | |
4a3b7949 | 222 | static void __attribute__((__noreturn__)) usage(FILE *out) |
15103c4b | 223 | { |
738767b9 | 224 | size_t i; |
f06ec64f | 225 | |
fbbc4c88 SK |
226 | fputs(USAGE_HEADER, out); |
227 | fprintf(out, _(" %s [options]\n"), program_invocation_short_name); | |
228 | fputs(USAGE_OPTIONS, out); | |
229 | fputs(_(" -C, --clear clear the kernel ring buffer\n"), out); | |
230 | fputs(_(" -c, --read-clear read and clear all messages\n"), out); | |
231 | fputs(_(" -D, --console-off disable printing messages to console\n"), out); | |
232 | fputs(_(" -d, --show-delta show time delta between printed messages\n"), out); | |
233 | fputs(_(" -e, --reltime show local time and time delta in readable format\n"), out); | |
234 | fputs(_(" -E, --console-on enable printing messages to console\n"), out); | |
235 | fputs(_(" -F, --file <file> use the file instead of the kernel log buffer\n"), out); | |
236 | fputs(_(" -f, --facility <list> restrict output to defined facilities\n"), out); | |
f0a3a1ca | 237 | fputs(_(" -H, --human human readable output\n"), out); |
fbbc4c88 | 238 | fputs(_(" -k, --kernel display kernel messages\n"), out); |
9bc2b51a | 239 | fputs(_(" -L, --color[=<when>] colorize messages (auto, always or never)\n"), out); |
fbbc4c88 SK |
240 | fputs(_(" -l, --level <list> restrict output to defined levels\n"), out); |
241 | fputs(_(" -n, --console-level <level> set level of messages printed to console\n"), out); | |
aa192520 | 242 | fputs(_(" -P, --nopager do not pipe output into a pager\n"), out); |
fbbc4c88 SK |
243 | fputs(_(" -r, --raw print the raw message buffer\n"), out); |
244 | fputs(_(" -S, --syslog force to use syslog(2) rather than /dev/kmsg\n"), out); | |
245 | fputs(_(" -s, --buffer-size <size> buffer size to query the kernel ring buffer\n"), out); | |
246 | fputs(_(" -T, --ctime show human readable timestamp (could be \n" | |
247 | " inaccurate if you have used SUSPEND/RESUME)\n"), out); | |
248 | fputs(_(" -t, --notime don't print messages timestamp\n"), out); | |
249 | fputs(_(" -u, --userspace display userspace messages\n"), out); | |
250 | fputs(_(" -w, --follow wait for new messages\n"), out); | |
251 | fputs(_(" -x, --decode decode facility and level to readable string\n"), out); | |
252 | fputs(USAGE_SEPARATOR, out); | |
253 | fputs(USAGE_HELP, out); | |
254 | fputs(USAGE_VERSION, out); | |
dcd16b0f | 255 | fputs(_("\nSupported log facilities:\n"), out); |
fbbc4c88 | 256 | for (i = 0; i < ARRAY_SIZE(level_names); i++) |
963ac507 | 257 | fprintf(out, " %7s - %s\n", |
fbbc4c88 SK |
258 | facility_names[i].name, |
259 | _(facility_names[i].help)); | |
85f3cc55 | 260 | |
dcd16b0f | 261 | fputs(_("\nSupported log levels (priorities):\n"), out); |
fbbc4c88 | 262 | for (i = 0; i < ARRAY_SIZE(level_names); i++) |
963ac507 | 263 | fprintf(out, " %7s - %s\n", |
fbbc4c88 SK |
264 | level_names[i].name, |
265 | _(level_names[i].help)); | |
0a86a1a6 | 266 | fputs(USAGE_SEPARATOR, out); |
30b44cf1 | 267 | fprintf(out, USAGE_MAN_TAIL("dmesg(1)")); |
4a3b7949 | 268 | exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); |
6dbe3af9 KZ |
269 | } |
270 | ||
5ef05369 KZ |
271 | /* |
272 | * LEVEL ::= <number> | <name> | |
8c8fa302 BM |
273 | * <number> ::= @len is set: number in range <0..N>, where N < ARRAY_SIZE(level_names) |
274 | * ::= @len not set: number in range <1..N>, where N <= ARRAY_SIZE(level_names) | |
5ef05369 | 275 | * <name> ::= case-insensitive text |
8c8fa302 BM |
276 | * |
277 | * Note that @len argument is not set when parsing "-n <level>" command line | |
278 | * option. The console_level is intepreted as "log level less than the value". | |
279 | * | |
280 | * For example "dmesg -n 8" or "dmesg -n debug" enables debug console log | |
281 | * level by klogctl(SYSLOG_ACTION_CONSOLE_LEVEL, NULL, 8). The @str argument | |
282 | * has to be parsed to number in range <1..8>. | |
5ef05369 | 283 | */ |
5c8f6bc6 | 284 | static int parse_level(const char *str, size_t len) |
f06ec64f | 285 | { |
8c8fa302 BM |
286 | int offset = 0; |
287 | ||
5c8f6bc6 | 288 | if (!str) |
f06ec64f | 289 | return -1; |
8c8fa302 | 290 | if (!len) { |
5c8f6bc6 | 291 | len = strlen(str); |
8c8fa302 BM |
292 | offset = 1; |
293 | } | |
5c8f6bc6 | 294 | errno = 0; |
f06ec64f | 295 | |
5c8f6bc6 KZ |
296 | if (isdigit(*str)) { |
297 | char *end = NULL; | |
8c8fa302 | 298 | long x = strtol(str, &end, 10) - offset; |
5c8f6bc6 | 299 | |
738767b9 KZ |
300 | if (!errno && end && end > str && (size_t) (end - str) == len && |
301 | x >= 0 && (size_t) x < ARRAY_SIZE(level_names)) | |
8c8fa302 | 302 | return x + offset; |
5c8f6bc6 | 303 | } else { |
738767b9 KZ |
304 | size_t i; |
305 | ||
5c8f6bc6 KZ |
306 | for (i = 0; i < ARRAY_SIZE(level_names); i++) { |
307 | const char *n = level_names[i].name; | |
308 | ||
309 | if (strncasecmp(str, n, len) == 0 && *(n + len) == '\0') | |
8c8fa302 | 310 | return i + offset; |
5c8f6bc6 KZ |
311 | } |
312 | } | |
313 | ||
314 | if (errno) | |
315 | err(EXIT_FAILURE, _("failed to parse level '%s'"), str); | |
316 | ||
317 | errx(EXIT_FAILURE, _("unknown level '%s'"), str); | |
f06ec64f KZ |
318 | return -1; |
319 | } | |
320 | ||
5ef05369 KZ |
321 | /* |
322 | * FACILITY ::= <number> | <name> | |
323 | * <number> ::= number in range <0..N>, where N < ARRAY_SIZE(facility_names) | |
324 | * <name> ::= case-insensitive text | |
325 | */ | |
0e24df3b KZ |
326 | static int parse_facility(const char *str, size_t len) |
327 | { | |
0e24df3b KZ |
328 | if (!str) |
329 | return -1; | |
330 | if (!len) | |
331 | len = strlen(str); | |
332 | errno = 0; | |
333 | ||
334 | if (isdigit(*str)) { | |
335 | char *end = NULL; | |
738767b9 | 336 | long x = strtol(str, &end, 10); |
0e24df3b | 337 | |
738767b9 KZ |
338 | if (!errno && end && end > str && (size_t) (end - str) == len && |
339 | x >= 0 && (size_t) x < ARRAY_SIZE(facility_names)) | |
340 | return x; | |
0e24df3b | 341 | } else { |
738767b9 KZ |
342 | size_t i; |
343 | ||
0e24df3b KZ |
344 | for (i = 0; i < ARRAY_SIZE(facility_names); i++) { |
345 | const char *n = facility_names[i].name; | |
346 | ||
347 | if (strncasecmp(str, n, len) == 0 && *(n + len) == '\0') | |
348 | return i; | |
349 | } | |
350 | } | |
351 | ||
352 | if (errno) | |
353 | err(EXIT_FAILURE, _("failed to parse facility '%s'"), str); | |
354 | ||
355 | errx(EXIT_FAILURE, _("unknown facility '%s'"), str); | |
356 | return -1; | |
357 | } | |
358 | ||
5ef05369 KZ |
359 | /* |
360 | * Parses numerical prefix used for all messages in kernel ring buffer. | |
361 | * | |
362 | * Priorities/facilities are encoded into a single 32-bit quantity, where the | |
363 | * bottom 3 bits are the priority (0-7) and the top 28 bits are the facility | |
364 | * (0-big number). | |
365 | * | |
ddca870a | 366 | * Note that the number has to end with '>' or ',' char. |
5ef05369 | 367 | */ |
636a6207 KZ |
368 | static const char *parse_faclev(const char *str, int *fac, int *lev) |
369 | { | |
370 | long num; | |
371 | char *end = NULL; | |
372 | ||
373 | if (!str) | |
374 | return str; | |
375 | ||
376 | errno = 0; | |
377 | num = strtol(str, &end, 10); | |
378 | ||
379 | if (!errno && end && end > str) { | |
380 | *fac = LOG_FAC(num); | |
381 | *lev = LOG_PRI(num); | |
85f3cc55 | 382 | |
738767b9 | 383 | if (*lev < 0 || (size_t) *lev > ARRAY_SIZE(level_names)) |
85f3cc55 | 384 | *lev = -1; |
738767b9 | 385 | if (*fac < 0 || (size_t) *fac > ARRAY_SIZE(facility_names)) |
85f3cc55 | 386 | *fac = -1; |
ddca870a | 387 | return end + 1; /* skip '<' or ',' */ |
636a6207 KZ |
388 | } |
389 | ||
390 | return str; | |
391 | } | |
392 | ||
ddca870a KZ |
393 | /* |
394 | * Parses timestamp from syslog message prefix, expected format: | |
395 | * | |
396 | * seconds.microseconds] | |
397 | * | |
398 | * the ']' is the timestamp field terminator. | |
399 | */ | |
400 | static const char *parse_syslog_timestamp(const char *str0, struct timeval *tv) | |
bd304d92 KZ |
401 | { |
402 | const char *str = str0; | |
403 | char *end = NULL; | |
404 | ||
405 | if (!str0) | |
406 | return str0; | |
407 | ||
408 | errno = 0; | |
409 | tv->tv_sec = strtol(str, &end, 10); | |
410 | ||
411 | if (!errno && end && *end == '.' && *(end + 1)) { | |
412 | str = end + 1; | |
413 | end = NULL; | |
414 | tv->tv_usec = strtol(str, &end, 10); | |
415 | } | |
416 | if (errno || !end || end == str || *end != ']') | |
417 | return str0; | |
418 | ||
419 | return end + 1; /* skip ']' */ | |
420 | } | |
421 | ||
ddca870a KZ |
422 | /* |
423 | * Parses timestamp from /dev/kmsg, expected formats: | |
424 | * | |
425 | * microseconds, | |
426 | * microseconds; | |
427 | * | |
428 | * the ',' is fields separators and ';' items terminator (for the last item) | |
429 | */ | |
430 | static const char *parse_kmsg_timestamp(const char *str0, struct timeval *tv) | |
431 | { | |
432 | const char *str = str0; | |
433 | char *end = NULL; | |
434 | uint64_t usec; | |
435 | ||
436 | if (!str0) | |
437 | return str0; | |
438 | ||
439 | errno = 0; | |
440 | usec = strtoumax(str, &end, 10); | |
441 | ||
442 | if (!errno && end && (*end == ';' || *end == ',')) { | |
443 | tv->tv_usec = usec % 1000000; | |
444 | tv->tv_sec = usec / 1000000; | |
445 | } else | |
446 | return str0; | |
447 | ||
448 | return end + 1; /* skip separator */ | |
449 | } | |
450 | ||
bd304d92 KZ |
451 | |
452 | static double time_diff(struct timeval *a, struct timeval *b) | |
453 | { | |
454 | return (a->tv_sec - b->tv_sec) + (a->tv_usec - b->tv_usec) / 1E6; | |
455 | } | |
456 | ||
7ff1f63f | 457 | static int get_syslog_buffer_size(void) |
eed99b2a KZ |
458 | { |
459 | int n = klogctl(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0); | |
460 | ||
461 | return n > 0 ? n : 0; | |
462 | } | |
463 | ||
42fac79a KZ |
464 | static time_t get_boot_time(void) |
465 | { | |
466 | struct sysinfo info; | |
467 | struct timeval tv; | |
468 | ||
469 | if (sysinfo(&info) != 0) | |
470 | warn(_("sysinfo failed")); | |
471 | else if (gettimeofday(&tv, NULL) != 0) | |
472 | warn(_("gettimeofday failed")); | |
473 | else | |
474 | return tv.tv_sec -= info.uptime; | |
475 | return 0; | |
476 | } | |
477 | ||
c672220f | 478 | /* |
7ff1f63f | 479 | * Reads messages from regular file by mmap |
c672220f | 480 | */ |
7ff1f63f | 481 | static ssize_t mmap_file_buffer(struct dmesg_control *ctl, char **buf) |
c672220f KZ |
482 | { |
483 | struct stat st; | |
9b3a6984 | 484 | int fd; |
c672220f | 485 | |
9b3a6984 KZ |
486 | if (!ctl->filename) |
487 | return -1; | |
488 | ||
489 | fd = open(ctl->filename, O_RDONLY); | |
c672220f | 490 | if (fd < 0) |
9b3a6984 | 491 | err(EXIT_FAILURE, _("cannot open %s"), ctl->filename); |
c672220f | 492 | if (fstat(fd, &st)) |
9b3a6984 | 493 | err(EXIT_FAILURE, _("stat failed %s"), ctl->filename); |
c672220f KZ |
494 | |
495 | *buf = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0); | |
496 | if (*buf == MAP_FAILED) | |
9b3a6984 | 497 | err(EXIT_FAILURE, _("cannot mmap: %s"), ctl->filename); |
c672220f KZ |
498 | ctl->mmap_buff = *buf; |
499 | ctl->pagesize = getpagesize(); | |
500 | close(fd); | |
501 | ||
502 | return st.st_size; | |
503 | } | |
504 | ||
5ef05369 | 505 | /* |
7ff1f63f | 506 | * Reads messages from kernel ring buffer by klogctl() |
5ef05369 | 507 | */ |
7ff1f63f | 508 | static ssize_t read_syslog_buffer(struct dmesg_control *ctl, char **buf) |
65e3eed9 KZ |
509 | { |
510 | size_t sz; | |
511 | int rc = -1; | |
65e3eed9 | 512 | |
e6471b9f KZ |
513 | if (ctl->bufsize) { |
514 | sz = ctl->bufsize + 8; | |
65e3eed9 | 515 | *buf = xmalloc(sz * sizeof(char)); |
e6471b9f | 516 | rc = klogctl(ctl->action, *buf, sz); |
65e3eed9 KZ |
517 | } else { |
518 | sz = 16392; | |
519 | while (1) { | |
520 | *buf = xmalloc(sz * sizeof(char)); | |
521 | rc = klogctl(SYSLOG_ACTION_READ_ALL, *buf, sz); | |
738767b9 KZ |
522 | if (rc < 0) |
523 | break; | |
524 | if ((size_t) rc != sz || sz > (1 << 28)) | |
65e3eed9 KZ |
525 | break; |
526 | free(*buf); | |
527 | *buf = NULL; | |
528 | sz *= 4; | |
529 | } | |
530 | ||
e6471b9f | 531 | if (rc > 0 && ctl->action == SYSLOG_ACTION_READ_CLEAR) |
65e3eed9 KZ |
532 | rc = klogctl(SYSLOG_ACTION_READ_CLEAR, *buf, sz); |
533 | } | |
534 | ||
535 | return rc; | |
536 | } | |
537 | ||
7ff1f63f KZ |
538 | /* |
539 | * Top level function to read messages | |
540 | */ | |
e6471b9f KZ |
541 | static ssize_t read_buffer(struct dmesg_control *ctl, char **buf) |
542 | { | |
543 | ssize_t n = -1; | |
544 | ||
545 | switch (ctl->method) { | |
546 | case DMESG_METHOD_MMAP: | |
7ff1f63f | 547 | n = mmap_file_buffer(ctl, buf); |
e6471b9f KZ |
548 | break; |
549 | case DMESG_METHOD_SYSLOG: | |
550 | if (!ctl->bufsize) | |
7ff1f63f | 551 | ctl->bufsize = get_syslog_buffer_size(); |
e6471b9f | 552 | |
7ff1f63f | 553 | n = read_syslog_buffer(ctl, buf); |
e6471b9f | 554 | break; |
ddca870a KZ |
555 | case DMESG_METHOD_KMSG: |
556 | /* | |
557 | * Since kernel 3.5.0 | |
558 | */ | |
559 | n = read_kmsg(ctl); | |
c677ffba KZ |
560 | if (n == 0 && ctl->action == SYSLOG_ACTION_READ_CLEAR) |
561 | n = klogctl(SYSLOG_ACTION_CLEAR, NULL, 0); | |
ddca870a | 562 | break; |
e6471b9f KZ |
563 | } |
564 | ||
565 | return n; | |
566 | } | |
567 | ||
b8300c0a KZ |
568 | static int fwrite_hex(const char *buf, size_t size, FILE *out) |
569 | { | |
738767b9 | 570 | size_t i; |
b8300c0a KZ |
571 | |
572 | for (i = 0; i < size; i++) { | |
573 | int rc = fprintf(out, "\\x%02x", buf[i]); | |
574 | if (rc < 0) | |
575 | return rc; | |
576 | } | |
577 | return 0; | |
578 | } | |
579 | ||
5ef05369 KZ |
580 | /* |
581 | * Prints to 'out' and non-printable chars are replaced with \x<hex> sequences. | |
582 | */ | |
b8300c0a KZ |
583 | static void safe_fwrite(const char *buf, size_t size, FILE *out) |
584 | { | |
738767b9 | 585 | size_t i; |
b8300c0a KZ |
586 | #ifdef HAVE_WIDECHAR |
587 | mbstate_t s; | |
588 | memset(&s, 0, sizeof (s)); | |
589 | #endif | |
590 | for (i = 0; i < size; i++) { | |
591 | const char *p = buf + i; | |
592 | int rc, hex = 0; | |
ddca870a | 593 | size_t len = 1; |
b8300c0a KZ |
594 | |
595 | #ifdef HAVE_WIDECHAR | |
596 | wchar_t wc; | |
0720766e | 597 | len = mbrtowc(&wc, p, size - i, &s); |
b8300c0a KZ |
598 | |
599 | if (len == 0) /* L'\0' */ | |
600 | return; | |
601 | ||
730d5e77 | 602 | if (len == (size_t)-1 || len == (size_t)-2) { /* invalid sequence */ |
b8300c0a KZ |
603 | memset(&s, 0, sizeof (s)); |
604 | len = hex = 1; | |
b8300c0a KZ |
605 | } else if (len > 1 && !iswprint(wc)) { /* non-printable multibyte */ |
606 | hex = 1; | |
b8300c0a | 607 | } |
0720766e PU |
608 | i += len - 1; |
609 | #else | |
610 | if (!isprint((unsigned int) *p) && | |
611 | !isspace((unsigned int) *p)) /* non-printable */ | |
612 | hex = 1; | |
613 | #endif | |
b8300c0a KZ |
614 | if (hex) |
615 | rc = fwrite_hex(p, len, out); | |
616 | else | |
85f3cc55 | 617 | rc = fwrite(p, 1, len, out) != len; |
b8300c0a KZ |
618 | if (rc != 0) |
619 | err(EXIT_FAILURE, _("write failed")); | |
620 | } | |
621 | } | |
622 | ||
ddca870a KZ |
623 | static const char *skip_item(const char *begin, const char *end, const char *sep) |
624 | { | |
625 | while (begin < end) { | |
626 | int c = *begin++; | |
627 | ||
628 | if (c == '\0' || strchr(sep, c)) | |
629 | break; | |
630 | } | |
631 | ||
632 | return begin; | |
633 | } | |
634 | ||
60464b1f KZ |
635 | /* |
636 | * Parses one record from syslog(2) buffer | |
637 | */ | |
7af23060 KZ |
638 | static int get_next_syslog_record(struct dmesg_control *ctl, |
639 | struct dmesg_record *rec) | |
f4fa5b44 | 640 | { |
738767b9 | 641 | size_t i; |
b8300c0a KZ |
642 | const char *begin = NULL; |
643 | ||
7af23060 KZ |
644 | if (ctl->method != DMESG_METHOD_MMAP && |
645 | ctl->method != DMESG_METHOD_SYSLOG) | |
646 | return -1; | |
647 | ||
a7ee94f2 KZ |
648 | if (!rec->next || !rec->next_size) |
649 | return 1; | |
f4fa5b44 | 650 | |
ddca870a | 651 | INIT_DMESG_RECORD(rec); |
a7ee94f2 | 652 | |
c672220f KZ |
653 | /* |
654 | * Unmap already printed file data from memory | |
655 | */ | |
656 | if (ctl->mmap_buff && (size_t) (rec->next - ctl->mmap_buff) > ctl->pagesize) { | |
657 | void *x = ctl->mmap_buff; | |
658 | ||
659 | ctl->mmap_buff += ctl->pagesize; | |
660 | munmap(x, ctl->pagesize); | |
661 | } | |
662 | ||
a7ee94f2 KZ |
663 | for (i = 0; i < rec->next_size; i++) { |
664 | const char *p = rec->next + i; | |
665 | const char *end = NULL; | |
b8300c0a KZ |
666 | |
667 | if (!begin) | |
668 | begin = p; | |
a7ee94f2 | 669 | if (i + 1 == rec->next_size) { |
b8300c0a | 670 | end = p + 1; |
f4fa5b44 | 671 | i++; |
22f69825 KZ |
672 | } else if (*p == '\n' && *(p + 1) == '<') |
673 | end = p; | |
674 | ||
a7ee94f2 KZ |
675 | if (begin && !*begin) |
676 | begin = NULL; /* zero(s) at the end of the buffer? */ | |
b8300c0a KZ |
677 | if (!begin || !end) |
678 | continue; | |
679 | if (end <= begin) | |
680 | continue; /* error or empty line? */ | |
681 | ||
636a6207 | 682 | if (*begin == '<') { |
bb901317 | 683 | if (ctl->fltr_lev || ctl->fltr_fac || ctl->decode || ctl->color) |
a7ee94f2 KZ |
684 | begin = parse_faclev(begin + 1, &rec->facility, |
685 | &rec->level); | |
ddca870a KZ |
686 | else |
687 | begin = skip_item(begin, end, ">"); | |
b8300c0a KZ |
688 | } |
689 | ||
bd304d92 KZ |
690 | if (*begin == '[' && (*(begin + 1) == ' ' || |
691 | isdigit(*(begin + 1)))) { | |
60464b1f | 692 | if (ctl->delta || ctl->ctime || ctl->reltime) |
ddca870a KZ |
693 | begin = parse_syslog_timestamp(begin + 1, &rec->tv); |
694 | else if (ctl->notime) | |
695 | begin = skip_item(begin, end, "]"); | |
696 | ||
31c9099a KZ |
697 | if (begin < end && *begin == ' ') |
698 | begin++; | |
a7ee94f2 | 699 | } |
d74b8dfc | 700 | |
a7ee94f2 KZ |
701 | rec->mesg = begin; |
702 | rec->mesg_size = end - begin; | |
b8300c0a | 703 | |
a7ee94f2 KZ |
704 | rec->next_size -= end - rec->next; |
705 | rec->next = rec->next_size > 0 ? end + 1 : NULL; | |
59202950 PU |
706 | if (rec->next_size > 0) |
707 | rec->next_size--; | |
a7ee94f2 KZ |
708 | |
709 | return 0; | |
710 | } | |
711 | ||
712 | return 1; | |
713 | } | |
714 | ||
715 | static int accept_record(struct dmesg_control *ctl, struct dmesg_record *rec) | |
716 | { | |
717 | if (ctl->fltr_lev && (rec->facility < 0 || | |
718 | !isset(ctl->levels, rec->level))) | |
719 | return 0; | |
720 | ||
721 | if (ctl->fltr_fac && (rec->facility < 0 || | |
722 | !isset(ctl->facilities, rec->facility))) | |
723 | return 0; | |
724 | ||
725 | return 1; | |
726 | } | |
727 | ||
7ff1f63f | 728 | static void raw_print(struct dmesg_control *ctl, const char *buf, size_t size) |
c672220f KZ |
729 | { |
730 | int lastc = '\n'; | |
731 | ||
732 | if (!ctl->mmap_buff) { | |
733 | /* | |
734 | * Print whole ring buffer | |
735 | */ | |
736 | safe_fwrite(buf, size, stdout); | |
737 | lastc = buf[size - 1]; | |
738 | } else { | |
739 | /* | |
740 | * Print file in small chunks to save memory | |
741 | */ | |
742 | while (size) { | |
743 | size_t sz = size > ctl->pagesize ? ctl->pagesize : size; | |
744 | char *x = ctl->mmap_buff; | |
745 | ||
746 | safe_fwrite(x, sz, stdout); | |
747 | lastc = x[sz - 1]; | |
748 | size -= sz; | |
749 | ctl->mmap_buff += sz; | |
750 | munmap(x, sz); | |
751 | } | |
752 | } | |
753 | ||
754 | if (lastc != '\n') | |
755 | putchar('\n'); | |
756 | } | |
757 | ||
60464b1f KZ |
758 | static struct tm *record_localtime(struct dmesg_control *ctl, |
759 | struct dmesg_record *rec, | |
760 | struct tm *tm) | |
761 | { | |
762 | time_t t = ctl->boot_time + rec->tv.tv_sec; | |
763 | return localtime_r(&t, tm); | |
764 | } | |
765 | ||
0d1b3300 KZ |
766 | static char *record_ctime(struct dmesg_control *ctl, |
767 | struct dmesg_record *rec, | |
768 | char *buf, size_t bufsiz) | |
769 | { | |
60464b1f | 770 | struct tm tm; |
0d1b3300 | 771 | |
60464b1f | 772 | record_localtime(ctl, rec, &tm); |
0d1b3300 | 773 | |
60464b1f | 774 | if (strftime(buf, bufsiz, "%a %b %e %H:%M:%S %Y", &tm) == 0) |
0d1b3300 KZ |
775 | *buf = '\0'; |
776 | return buf; | |
777 | } | |
778 | ||
60464b1f KZ |
779 | static char *short_ctime(struct tm *tm, char *buf, size_t bufsiz) |
780 | { | |
781 | if (strftime(buf, bufsiz, "%b%e %H:%M", tm) == 0) | |
782 | *buf = '\0'; | |
783 | return buf; | |
784 | } | |
785 | ||
786 | static double record_count_delta(struct dmesg_control *ctl, | |
787 | struct dmesg_record *rec) | |
788 | { | |
789 | double delta = 0; | |
790 | ||
791 | if (timerisset(&ctl->lasttime)) | |
792 | delta = time_diff(&rec->tv, &ctl->lasttime); | |
793 | ||
794 | ctl->lasttime = rec->tv; | |
795 | return delta; | |
796 | } | |
797 | ||
5aaee63c KZ |
798 | static const char *get_subsys_delimiter(const char *mesg, size_t mesg_size) |
799 | { | |
800 | const char *p = mesg; | |
801 | size_t sz = mesg_size; | |
802 | ||
803 | while (sz > 0) { | |
804 | const char *d = strnchr(p, sz, ':'); | |
805 | if (!d) | |
806 | return NULL; | |
807 | sz -= d - p; | |
808 | if (sz) { | |
809 | if (isblank(*(d + 1))) | |
810 | return d; | |
811 | p = d + 1; | |
812 | } | |
813 | } | |
814 | return NULL; | |
815 | } | |
816 | ||
60464b1f KZ |
817 | static void print_record(struct dmesg_control *ctl, |
818 | struct dmesg_record *rec) | |
7af23060 | 819 | { |
0d1b3300 | 820 | char buf[256]; |
098ce273 | 821 | int has_color = 0; |
5aaee63c KZ |
822 | const char *mesg; |
823 | size_t mesg_size; | |
7af23060 KZ |
824 | |
825 | if (!accept_record(ctl, rec)) | |
826 | return; | |
827 | ||
828 | if (!rec->mesg_size) { | |
829 | putchar('\n'); | |
830 | return; | |
831 | } | |
832 | ||
0d1b3300 KZ |
833 | /* |
834 | * compose syslog(2) compatible raw output -- used for /dev/kmsg for | |
835 | * backward compatibility with syslog(2) buffers only | |
836 | */ | |
37b04d6c | 837 | if (ctl->raw) { |
37b04d6c KZ |
838 | printf("<%d>[%5d.%06d] ", |
839 | LOG_MAKEPRI(rec->facility, rec->level), | |
840 | (int) rec->tv.tv_sec, | |
841 | (int) rec->tv.tv_usec); | |
842 | ||
843 | goto mesg; | |
844 | } | |
845 | ||
0d1b3300 KZ |
846 | /* |
847 | * facility : priority : | |
848 | */ | |
ae6288da SK |
849 | if (ctl->decode && |
850 | -1 < rec->level && rec->level < (int) ARRAY_SIZE(level_names) && | |
851 | -1 < rec->facility && rec->facility < (int) ARRAY_SIZE(facility_names)) | |
7af23060 KZ |
852 | printf("%-6s:%-6s: ", facility_names[rec->facility].name, |
853 | level_names[rec->level].name); | |
854 | ||
0d1b3300 KZ |
855 | /* |
856 | * [sec.usec <delta>] or [ctime <delta>] | |
857 | */ | |
7af23060 | 858 | if (ctl->delta) { |
5aaee63c KZ |
859 | if (ctl->color) |
860 | color_enable(DMESG_COLOR_TIME); | |
0d1b3300 KZ |
861 | if (ctl->ctime) |
862 | printf("[%s ", record_ctime(ctl, rec, buf, sizeof(buf))); | |
7af23060 KZ |
863 | else if (ctl->notime) |
864 | putchar('['); | |
865 | else | |
866 | printf("[%5d.%06d ", (int) rec->tv.tv_sec, | |
867 | (int) rec->tv.tv_usec); | |
60464b1f | 868 | printf("<%12.06f>] ", record_count_delta(ctl, rec)); |
5aaee63c KZ |
869 | if (ctl->color) |
870 | color_disable(); | |
0d1b3300 KZ |
871 | |
872 | /* | |
873 | * [ctime] | |
874 | */ | |
5aaee63c KZ |
875 | } else if (ctl->ctime) { |
876 | if (ctl->color) | |
877 | color_enable(DMESG_COLOR_TIME); | |
0d1b3300 | 878 | printf("[%s] ", record_ctime(ctl, rec, buf, sizeof(buf))); |
5aaee63c KZ |
879 | if (ctl->color) |
880 | color_disable(); | |
881 | } | |
0d1b3300 | 882 | |
60464b1f KZ |
883 | /* |
884 | * [reltime] | |
885 | */ | |
886 | else if (ctl->reltime) { | |
887 | double delta; | |
888 | struct tm cur; | |
889 | ||
890 | record_localtime(ctl, rec, &cur); | |
891 | delta = record_count_delta(ctl, rec); | |
892 | ||
893 | if (cur.tm_min != ctl->lasttm.tm_min || | |
894 | cur.tm_hour != ctl->lasttm.tm_hour || | |
5aaee63c KZ |
895 | cur.tm_yday != ctl->lasttm.tm_yday) { |
896 | if (ctl->color) | |
897 | color_enable(DMESG_COLOR_RELTIME); | |
60464b1f | 898 | printf("[%s] ", short_ctime(&cur, buf, sizeof(buf))); |
5aaee63c KZ |
899 | } else { |
900 | if (ctl->color) | |
901 | color_enable(DMESG_COLOR_TIME); | |
902 | if (delta < 10) | |
903 | printf("[ %+8.06f] ", delta); | |
904 | else | |
905 | printf("[ %+9.06f] ", delta); | |
906 | } | |
907 | if (ctl->color) | |
908 | color_disable(); | |
60464b1f KZ |
909 | ctl->lasttm = cur; |
910 | } | |
7af23060 | 911 | |
ddca870a KZ |
912 | /* |
913 | * In syslog output the timestamp is part of the message and we don't | |
914 | * parse the timestamp by default. We parse the timestamp only if | |
915 | * --show-delta or --ctime is specified. | |
916 | * | |
917 | * In kmsg output we always parse the timesptamp, so we have to compose | |
918 | * the [sec.usec] string. | |
919 | */ | |
920 | if (ctl->method == DMESG_METHOD_KMSG && | |
5aaee63c KZ |
921 | !ctl->notime && !ctl->delta && !ctl->ctime && !ctl->reltime) { |
922 | if (ctl->color) | |
923 | color_enable(DMESG_COLOR_TIME); | |
ddca870a | 924 | printf("[%5d.%06d] ", (int) rec->tv.tv_sec, (int) rec->tv.tv_usec); |
5aaee63c KZ |
925 | if (ctl->color) |
926 | color_disable(); | |
927 | } | |
ddca870a | 928 | |
37b04d6c | 929 | mesg: |
5aaee63c KZ |
930 | mesg = rec->mesg; |
931 | mesg_size = rec->mesg_size; | |
932 | ||
933 | /* Colorize output */ | |
934 | if (ctl->color) { | |
935 | /* subsystem prefix */ | |
936 | const char *subsys = get_subsys_delimiter(mesg, mesg_size); | |
937 | if (subsys) { | |
938 | color_enable(DMESG_COLOR_SUBSYS); | |
939 | safe_fwrite(mesg, subsys - mesg, stdout); | |
940 | color_disable(); | |
941 | ||
942 | mesg_size -= subsys - mesg; | |
943 | mesg = subsys; | |
944 | } | |
945 | /* error, alert .. etc. colors */ | |
946 | has_color = set_level_color(rec->level, mesg, mesg_size) == 0; | |
947 | safe_fwrite(mesg, mesg_size, stdout); | |
948 | if (has_color) | |
949 | color_disable(); | |
950 | } else | |
951 | safe_fwrite(mesg, mesg_size, stdout); | |
098ce273 | 952 | |
5aaee63c | 953 | if (*(mesg + mesg_size - 1) != '\n') |
7af23060 KZ |
954 | putchar('\n'); |
955 | } | |
956 | ||
a7ee94f2 KZ |
957 | /* |
958 | * Prints the 'buf' kernel ring buffer; the messages are filtered out according | |
959 | * to 'levels' and 'facilities' bitarrays. | |
960 | */ | |
7ff1f63f KZ |
961 | static void print_buffer(struct dmesg_control *ctl, |
962 | const char *buf, size_t size) | |
a7ee94f2 KZ |
963 | { |
964 | struct dmesg_record rec = { .next = buf, .next_size = size }; | |
965 | ||
966 | if (ctl->raw) { | |
7ff1f63f | 967 | raw_print(ctl, buf, size); |
a7ee94f2 KZ |
968 | return; |
969 | } | |
970 | ||
7af23060 KZ |
971 | while (get_next_syslog_record(ctl, &rec) == 0) |
972 | print_record(ctl, &rec); | |
973 | } | |
a7ee94f2 | 974 | |
4ceb601d MB |
975 | static ssize_t read_kmsg_one(struct dmesg_control *ctl) |
976 | { | |
977 | ssize_t size; | |
978 | ||
979 | /* kmsg returns EPIPE if record was modified while reading */ | |
980 | do { | |
981 | size = read(ctl->kmsg, ctl->kmsg_buf, | |
982 | sizeof(ctl->kmsg_buf) - 1); | |
983 | } while (size < 0 && errno == EPIPE); | |
984 | ||
985 | return size; | |
986 | } | |
987 | ||
7af23060 KZ |
988 | static int init_kmsg(struct dmesg_control *ctl) |
989 | { | |
0fd12a96 KZ |
990 | int mode = O_RDONLY; |
991 | ||
992 | if (!ctl->follow) | |
993 | mode |= O_NONBLOCK; | |
994 | ||
995 | ctl->kmsg = open("/dev/kmsg", mode); | |
c677ffba KZ |
996 | if (ctl->kmsg < 0) |
997 | return -1; | |
998 | ||
999 | /* | |
1000 | * Seek after the last record available at the time | |
1001 | * the last SYSLOG_ACTION_CLEAR was issued. | |
1002 | * | |
1003 | * ... otherwise SYSLOG_ACTION_CLEAR will have no effect for kmsg. | |
1004 | */ | |
1005 | lseek(ctl->kmsg, 0, SEEK_DATA); | |
298a073c KZ |
1006 | |
1007 | /* | |
1008 | * Old kernels (<3.5) allow to successfully open /dev/kmsg for | |
1009 | * read-only, but read() returns -EINVAL :-((( | |
1010 | * | |
1011 | * Let's try to read the first record. The record is later processed in | |
1012 | * read_kmsg(). | |
1013 | */ | |
4ceb601d | 1014 | ctl->kmsg_first_read = read_kmsg_one(ctl); |
298a073c KZ |
1015 | if (ctl->kmsg_first_read < 0) { |
1016 | close(ctl->kmsg); | |
1017 | ctl->kmsg = -1; | |
1018 | return -1; | |
1019 | } | |
1020 | ||
c677ffba | 1021 | return 0; |
f4fa5b44 KZ |
1022 | } |
1023 | ||
ddca870a KZ |
1024 | /* |
1025 | * /dev/kmsg record format: | |
1026 | * | |
1027 | * faclev,seqnum,timestamp[optional, ...];messgage\n | |
1028 | * TAGNAME=value | |
1029 | * ... | |
1030 | * | |
1031 | * - fields are separated by ',' | |
1032 | * - last field is terminated by ';' | |
1033 | * | |
1034 | */ | |
1035 | #define LAST_KMSG_FIELD(s) (!s || !*s || *(s - 1) == ';') | |
1036 | ||
1037 | static int parse_kmsg_record(struct dmesg_control *ctl, | |
1038 | struct dmesg_record *rec, | |
1039 | char *buf, | |
1040 | size_t sz) | |
1041 | { | |
1042 | const char *p = buf, *end; | |
1043 | ||
1044 | if (sz == 0 || !buf || !*buf) | |
1045 | return -1; | |
1046 | ||
1047 | end = buf + (sz - 1); | |
1048 | INIT_DMESG_RECORD(rec); | |
1049 | ||
1050 | while (p < end && isspace(*p)) | |
1051 | p++; | |
1052 | ||
1053 | /* A) priority and facility */ | |
098ce273 OO |
1054 | if (ctl->fltr_lev || ctl->fltr_fac || ctl->decode || |
1055 | ctl->raw || ctl->color) | |
ddca870a KZ |
1056 | p = parse_faclev(p, &rec->facility, &rec->level); |
1057 | else | |
1058 | p = skip_item(p, end, ","); | |
1059 | if (LAST_KMSG_FIELD(p)) | |
1060 | goto mesg; | |
1061 | ||
1062 | /* B) sequence number */ | |
1063 | p = skip_item(p, end, ",;"); | |
1064 | if (LAST_KMSG_FIELD(p)) | |
1065 | goto mesg; | |
1066 | ||
1067 | /* C) timestamp */ | |
1068 | if (ctl->notime) | |
1069 | p = skip_item(p, end, ",;"); | |
1070 | else | |
1071 | p = parse_kmsg_timestamp(p, &rec->tv); | |
1072 | if (LAST_KMSG_FIELD(p)) | |
1073 | goto mesg; | |
1074 | ||
1075 | /* D) optional fields (ignore) */ | |
1076 | p = skip_item(p, end, ";"); | |
1077 | if (LAST_KMSG_FIELD(p)) | |
1078 | goto mesg; | |
1079 | ||
1080 | mesg: | |
1081 | /* E) message text */ | |
1082 | rec->mesg = p; | |
1083 | p = skip_item(p, end, "\n"); | |
1084 | ||
1085 | if (!p) | |
1086 | return -1; | |
1087 | ||
1088 | rec->mesg_size = p - rec->mesg; | |
1089 | ||
1090 | /* | |
1091 | * Kernel escapes non-printable characters, unfortuately kernel | |
1092 | * definition of "non-printable" is too strict. On UTF8 console we can | |
1093 | * print many chars, so let's decode from kernel. | |
1094 | */ | |
1095 | unhexmangle_to_buffer(rec->mesg, (char *) rec->mesg, rec->mesg_size + 1); | |
1096 | ||
1097 | /* F) message tags (ignore) */ | |
1098 | ||
1099 | return 0; | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * Note that each read() call for /dev/kmsg returns always one record. It means | |
1104 | * that we don't have to read whole message buffer before the records parsing. | |
1105 | * | |
1106 | * So this function does not compose one huge buffer (like read_syslog_buffer()) | |
1107 | * and print_buffer() is unnecessary. All is done in this function. | |
1108 | * | |
1109 | * Returns 0 on success, -1 on error. | |
1110 | */ | |
1111 | static int read_kmsg(struct dmesg_control *ctl) | |
1112 | { | |
ddca870a | 1113 | struct dmesg_record rec; |
298a073c | 1114 | ssize_t sz; |
ddca870a KZ |
1115 | |
1116 | if (ctl->method != DMESG_METHOD_KMSG || ctl->kmsg < 0) | |
1117 | return -1; | |
1118 | ||
298a073c KZ |
1119 | /* |
1120 | * The very first read() call is done in kmsg_init() where we test | |
1121 | * /dev/kmsg usability. The return code from the initial read() is | |
1122 | * stored in ctl->kmsg_first_read; | |
1123 | */ | |
1124 | sz = ctl->kmsg_first_read; | |
ddca870a | 1125 | |
298a073c KZ |
1126 | while (sz > 0) { |
1127 | *(ctl->kmsg_buf + sz) = '\0'; /* for debug messages */ | |
ddca870a | 1128 | |
298a073c KZ |
1129 | if (parse_kmsg_record(ctl, &rec, |
1130 | ctl->kmsg_buf, (size_t) sz) == 0) | |
1131 | print_record(ctl, &rec); | |
37b04d6c | 1132 | |
4ceb601d | 1133 | sz = read_kmsg_one(ctl); |
298a073c | 1134 | } |
ddca870a KZ |
1135 | |
1136 | return 0; | |
1137 | } | |
1138 | ||
15103c4b MP |
1139 | int main(int argc, char *argv[]) |
1140 | { | |
1141 | char *buf = NULL; | |
aa192520 | 1142 | int c, nopager = 0; |
48c5c662 | 1143 | int console_level = 0; |
6e9b06cc KZ |
1144 | int klog_rc = 0; |
1145 | ssize_t n; | |
9b3a6984 | 1146 | static struct dmesg_control ctl = { |
e6471b9f | 1147 | .filename = NULL, |
7ff1f63f | 1148 | .action = SYSLOG_ACTION_READ_ALL, |
ed61acc2 | 1149 | .method = DMESG_METHOD_KMSG, |
7af23060 | 1150 | .kmsg = -1, |
9b3a6984 | 1151 | }; |
9bc2b51a | 1152 | int colormode = UL_COLORMODE_NEVER; |
6dbe3af9 | 1153 | |
4a3b7949 | 1154 | static const struct option longopts[] = { |
4a3b7949 | 1155 | { "buffer-size", required_argument, NULL, 's' }, |
5ef05369 | 1156 | { "clear", no_argument, NULL, 'C' }, |
9bc2b51a | 1157 | { "color", optional_argument, NULL, 'L' }, |
4a3b7949 | 1158 | { "console-level", required_argument, NULL, 'n' }, |
bd304d92 KZ |
1159 | { "console-off", no_argument, NULL, 'D' }, |
1160 | { "console-on", no_argument, NULL, 'E' }, | |
5ef05369 | 1161 | { "decode", no_argument, NULL, 'x' }, |
c672220f | 1162 | { "file", required_argument, NULL, 'F' }, |
0e24df3b | 1163 | { "facility", required_argument, NULL, 'f' }, |
0fd12a96 | 1164 | { "follow", no_argument, NULL, 'w' }, |
f0a3a1ca | 1165 | { "human", no_argument, NULL, 'H' }, |
4a3b7949 | 1166 | { "help", no_argument, NULL, 'h' }, |
25000180 | 1167 | { "kernel", no_argument, NULL, 'k' }, |
5ef05369 | 1168 | { "level", required_argument, NULL, 'l' }, |
ed61acc2 | 1169 | { "syslog", no_argument, NULL, 'S' }, |
5ef05369 KZ |
1170 | { "raw", no_argument, NULL, 'r' }, |
1171 | { "read-clear", no_argument, NULL, 'c' }, | |
60464b1f | 1172 | { "reltime", no_argument, NULL, 'e' }, |
bd304d92 | 1173 | { "show-delta", no_argument, NULL, 'd' }, |
42fac79a | 1174 | { "ctime", no_argument, NULL, 'T' }, |
d74b8dfc | 1175 | { "notime", no_argument, NULL, 't' }, |
aa192520 | 1176 | { "nopager", no_argument, NULL, 'P' }, |
25000180 | 1177 | { "userspace", no_argument, NULL, 'u' }, |
5ef05369 | 1178 | { "version", no_argument, NULL, 'V' }, |
4a3b7949 KZ |
1179 | { NULL, 0, NULL, 0 } |
1180 | }; | |
1181 | ||
43d2eeef KZ |
1182 | static const ul_excl_t excl[] = { /* rows and cols in in ASCII order */ |
1183 | { 'C','D','E','c','n' }, /* clear,off,on,read-clear,level*/ | |
f0a3a1ca | 1184 | { 'H','r' }, /* human, raw */ |
5aaee63c | 1185 | { 'L','r' }, /* color, raw */ |
43d2eeef KZ |
1186 | { 'S','w' }, /* syslog,follow */ |
1187 | { 0 } | |
1188 | }; | |
1189 | int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT; | |
1190 | ||
df1dddf9 KZ |
1191 | setlocale(LC_ALL, ""); |
1192 | bindtextdomain(PACKAGE, LOCALEDIR); | |
1193 | textdomain(PACKAGE); | |
efb8854f | 1194 | atexit(close_stdout); |
7eda085c | 1195 | |
9bc2b51a | 1196 | while ((c = getopt_long(argc, argv, "CcDdEeF:f:HhkL::l:n:iPrSs:TtuVwx", |
aca1633a | 1197 | longopts, NULL)) != -1) { |
43d2eeef KZ |
1198 | |
1199 | err_exclusive_options(c, longopts, excl, excl_st); | |
1200 | ||
df1dddf9 | 1201 | switch (c) { |
04199860 | 1202 | case 'C': |
e6471b9f | 1203 | ctl.action = SYSLOG_ACTION_CLEAR; |
04199860 | 1204 | break; |
df1dddf9 | 1205 | case 'c': |
e6471b9f | 1206 | ctl.action = SYSLOG_ACTION_READ_CLEAR; |
df1dddf9 | 1207 | break; |
bd304d92 | 1208 | case 'D': |
e6471b9f | 1209 | ctl.action = SYSLOG_ACTION_CONSOLE_OFF; |
2170174e | 1210 | break; |
bd304d92 KZ |
1211 | case 'd': |
1212 | ctl.delta = 1; | |
1213 | break; | |
1214 | case 'E': | |
e6471b9f | 1215 | ctl.action = SYSLOG_ACTION_CONSOLE_ON; |
2170174e | 1216 | break; |
60464b1f | 1217 | case 'e': |
f0a3a1ca | 1218 | ctl.reltime = 1; |
60464b1f | 1219 | break; |
c672220f | 1220 | case 'F': |
9b3a6984 | 1221 | ctl.filename = optarg; |
e6471b9f | 1222 | ctl.method = DMESG_METHOD_MMAP; |
c672220f | 1223 | break; |
0e24df3b | 1224 | case 'f': |
aca1633a | 1225 | ctl.fltr_fac = 1; |
c87638ad KZ |
1226 | if (string_to_bitarray(optarg, |
1227 | ctl.facilities, parse_facility) < 0) | |
1228 | return EXIT_FAILURE; | |
0e24df3b | 1229 | break; |
f0a3a1ca KZ |
1230 | case 'H': |
1231 | ctl.reltime = 1; | |
1232 | ctl.color = 1; | |
aa192520 | 1233 | ctl.pager = 1; |
f0a3a1ca | 1234 | break; |
5ef05369 KZ |
1235 | case 'h': |
1236 | usage(stdout); | |
df1dddf9 | 1237 | break; |
25000180 | 1238 | case 'k': |
aca1633a KZ |
1239 | ctl.fltr_fac = 1; |
1240 | setbit(ctl.facilities, FAC_BASE(LOG_KERN)); | |
25000180 | 1241 | break; |
098ce273 | 1242 | case 'L': |
9bc2b51a KZ |
1243 | colormode = UL_COLORMODE_AUTO; |
1244 | if (optarg) { | |
1245 | char *p = *optarg == '=' ? optarg + 1 : optarg; | |
1246 | colormode = colormode_from_string(p); | |
1247 | if (colormode < 0) | |
1248 | errx(EXIT_FAILURE, _("unsupported color mode: '%s'"), p); | |
1249 | } | |
098ce273 | 1250 | break; |
636a6207 | 1251 | case 'l': |
aca1633a | 1252 | ctl.fltr_lev= 1; |
c87638ad KZ |
1253 | if (string_to_bitarray(optarg, |
1254 | ctl.levels, parse_level) < 0) | |
1255 | return EXIT_FAILURE; | |
636a6207 | 1256 | break; |
5ef05369 | 1257 | case 'n': |
e6471b9f | 1258 | ctl.action = SYSLOG_ACTION_CONSOLE_LEVEL; |
5ef05369 KZ |
1259 | console_level = parse_level(optarg, 0); |
1260 | break; | |
aa192520 KZ |
1261 | case 'P': |
1262 | nopager = 1; | |
1263 | break; | |
11ea22d5 | 1264 | case 'r': |
aca1633a | 1265 | ctl.raw = 1; |
11ea22d5 | 1266 | break; |
ed61acc2 KZ |
1267 | case 'S': |
1268 | ctl.method = DMESG_METHOD_SYSLOG; | |
1269 | break; | |
df1dddf9 | 1270 | case 's': |
e6471b9f KZ |
1271 | ctl.bufsize = strtou32_or_err(optarg, |
1272 | _("invalid buffer size argument")); | |
1273 | if (ctl.bufsize < 4096) | |
1274 | ctl.bufsize = 4096; | |
df1dddf9 | 1275 | break; |
42fac79a KZ |
1276 | case 'T': |
1277 | ctl.boot_time = get_boot_time(); | |
1278 | if (ctl.boot_time) | |
1279 | ctl.ctime = 1; | |
1280 | break; | |
d74b8dfc | 1281 | case 't': |
aca1633a | 1282 | ctl.notime = 1; |
d74b8dfc | 1283 | break; |
25000180 | 1284 | case 'u': |
aca1633a | 1285 | ctl.fltr_fac = 1; |
738767b9 | 1286 | for (n = 1; (size_t) n < ARRAY_SIZE(facility_names); n++) |
aca1633a | 1287 | setbit(ctl.facilities, n); |
25000180 | 1288 | break; |
4a3b7949 KZ |
1289 | case 'V': |
1290 | printf(_("%s from %s\n"), program_invocation_short_name, | |
1291 | PACKAGE_STRING); | |
1292 | return EXIT_SUCCESS; | |
0fd12a96 | 1293 | case 'w': |
0fd12a96 KZ |
1294 | ctl.follow = 1; |
1295 | break; | |
5ef05369 | 1296 | case 'x': |
aca1633a | 1297 | ctl.decode = 1; |
4a3b7949 | 1298 | break; |
df1dddf9 KZ |
1299 | case '?': |
1300 | default: | |
4a3b7949 | 1301 | usage(stderr); |
df1dddf9 KZ |
1302 | } |
1303 | } | |
1304 | argc -= optind; | |
1305 | argv += optind; | |
e6c379eb | 1306 | |
15103c4b | 1307 | if (argc > 1) |
4a3b7949 | 1308 | usage(stderr); |
6dbe3af9 | 1309 | |
641986cf KZ |
1310 | if (ctl.raw && (ctl.fltr_lev || ctl.fltr_fac || ctl.delta || |
1311 | ctl.notime || ctl.ctime || ctl.decode)) | |
1312 | errx(EXIT_FAILURE, _("--raw can't be used together with level, " | |
1313 | "facility, decode, delta, ctime or notime options")); | |
1314 | ||
60464b1f KZ |
1315 | if (ctl.notime && (ctl.ctime || ctl.reltime)) |
1316 | errx(EXIT_FAILURE, _("--notime can't be used together with --ctime or --reltime")); | |
1317 | if (ctl.reltime && ctl.ctime) | |
1318 | errx(EXIT_FAILURE, _("--reltime can't be used together with --ctime ")); | |
85f3cc55 | 1319 | |
f0a3a1ca KZ |
1320 | if (ctl.reltime) { |
1321 | ctl.boot_time = get_boot_time(); | |
1322 | if (!ctl.boot_time) | |
1323 | ctl.reltime = 0; | |
1324 | } | |
9bc2b51a KZ |
1325 | |
1326 | ctl.color = colors_init(colormode) ? 1 : 0; | |
f0a3a1ca | 1327 | |
aa192520 KZ |
1328 | ctl.pager = nopager ? 0 : ctl.pager; |
1329 | if (ctl.pager) | |
1330 | setup_pager(); | |
1331 | ||
e6471b9f | 1332 | switch (ctl.action) { |
48c5c662 KZ |
1333 | case SYSLOG_ACTION_READ_ALL: |
1334 | case SYSLOG_ACTION_READ_CLEAR: | |
7af23060 KZ |
1335 | if (ctl.method == DMESG_METHOD_KMSG && init_kmsg(&ctl) != 0) |
1336 | ctl.method = DMESG_METHOD_SYSLOG; | |
aa192520 KZ |
1337 | if (ctl.pager) |
1338 | setup_pager(); | |
6e9b06cc KZ |
1339 | n = read_buffer(&ctl, &buf); |
1340 | if (n > 0) | |
1341 | print_buffer(&ctl, buf, n); | |
7ff1f63f | 1342 | if (!ctl.mmap_buff) |
c672220f | 1343 | free(buf); |
6e9b06cc KZ |
1344 | if (n < 0) |
1345 | err(EXIT_FAILURE, _("read kernel buffer failed")); | |
1346 | if (ctl.kmsg >= 0) | |
1347 | close(ctl.kmsg); | |
48c5c662 | 1348 | break; |
04199860 | 1349 | case SYSLOG_ACTION_CLEAR: |
2170174e KZ |
1350 | case SYSLOG_ACTION_CONSOLE_OFF: |
1351 | case SYSLOG_ACTION_CONSOLE_ON: | |
6e9b06cc | 1352 | klog_rc = klogctl(ctl.action, NULL, 0); |
04199860 | 1353 | break; |
48c5c662 | 1354 | case SYSLOG_ACTION_CONSOLE_LEVEL: |
6e9b06cc | 1355 | klog_rc = klogctl(ctl.action, NULL, console_level); |
48c5c662 KZ |
1356 | break; |
1357 | default: | |
1358 | errx(EXIT_FAILURE, _("unsupported command")); | |
1359 | break; | |
df1dddf9 | 1360 | } |
6dbe3af9 | 1361 | |
7af23060 | 1362 | |
6e9b06cc | 1363 | if (klog_rc) |
15103c4b | 1364 | err(EXIT_FAILURE, _("klogctl failed")); |
6dbe3af9 | 1365 | |
15103c4b | 1366 | return EXIT_SUCCESS; |
6dbe3af9 | 1367 | } |