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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" |
5423ccb1 | 26 | #include "nls.h" |
15673c15 | 27 | #include "strutils.h" |
15103c4b | 28 | #include "xalloc.h" |
b8300c0a | 29 | #include "widechar.h" |
e12c9866 | 30 | #include "all-io.h" |
636a6207 | 31 | #include "bitops.h" |
efb8854f | 32 | #include "closestream.h" |
94920134 | 33 | #include "optutils.h" |
6dbe3af9 | 34 | |
59a14899 KZ |
35 | /* Close the log. Currently a NOP. */ |
36 | #define SYSLOG_ACTION_CLOSE 0 | |
37 | /* Open the log. Currently a NOP. */ | |
38 | #define SYSLOG_ACTION_OPEN 1 | |
39 | /* Read from the log. */ | |
40 | #define SYSLOG_ACTION_READ 2 | |
41 | /* Read all messages remaining in the ring buffer. (allowed for non-root) */ | |
42 | #define SYSLOG_ACTION_READ_ALL 3 | |
43 | /* Read and clear all messages remaining in the ring buffer */ | |
44 | #define SYSLOG_ACTION_READ_CLEAR 4 | |
45 | /* Clear ring buffer. */ | |
46 | #define SYSLOG_ACTION_CLEAR 5 | |
47 | /* Disable printk's to console */ | |
48 | #define SYSLOG_ACTION_CONSOLE_OFF 6 | |
49 | /* Enable printk's to console */ | |
50 | #define SYSLOG_ACTION_CONSOLE_ON 7 | |
51 | /* Set level of messages printed to console */ | |
52 | #define SYSLOG_ACTION_CONSOLE_LEVEL 8 | |
53 | /* Return number of unread characters in the log buffer */ | |
54 | #define SYSLOG_ACTION_SIZE_UNREAD 9 | |
55 | /* Return size of the log buffer */ | |
56 | #define SYSLOG_ACTION_SIZE_BUFFER 10 | |
57 | ||
94920134 SK |
58 | #define EXCL_ERROR "--{clear,read-clear,console-level,console-on,console-off}" |
59 | ||
f06ec64f | 60 | /* |
5ef05369 | 61 | * Priority and facility names |
f06ec64f KZ |
62 | */ |
63 | struct dmesg_name { | |
64 | const char *name; | |
65 | const char *help; | |
66 | }; | |
67 | ||
5ef05369 KZ |
68 | /* |
69 | * Priority names -- based on sys/syslog.h | |
70 | */ | |
f06ec64f KZ |
71 | static const struct dmesg_name level_names[] = |
72 | { | |
73 | [LOG_EMERG] = { "emerg", N_("system is unusable") }, | |
74 | [LOG_ALERT] = { "alert", N_("action must be taken immediately") }, | |
75 | [LOG_CRIT] = { "crit", N_("critical conditions") }, | |
76 | [LOG_ERR] = { "err", N_("error conditions") }, | |
77 | [LOG_WARNING] = { "warn", N_("warning conditions") }, | |
78 | [LOG_NOTICE] = { "notice",N_("normal but significant condition") }, | |
79 | [LOG_INFO] = { "info", N_("informational") }, | |
80 | [LOG_DEBUG] = { "debug", N_("debug-level messages") } | |
81 | }; | |
82 | ||
85f3cc55 KZ |
83 | /* |
84 | * sys/syslog.h uses (f << 3) for all facility codes. | |
85 | * We want to use the codes as array idexes, so shift back... | |
86 | * | |
87 | * Note that libc LOG_FAC() macro returns the base codes, not the | |
88 | * shifted code :-) | |
89 | */ | |
90 | #define FAC_BASE(f) ((f) >> 3) | |
91 | ||
92 | static const struct dmesg_name facility_names[] = | |
93 | { | |
94 | [FAC_BASE(LOG_KERN)] = { "kern", N_("kernel messages") }, | |
95 | [FAC_BASE(LOG_USER)] = { "user", N_("random user-level messages") }, | |
96 | [FAC_BASE(LOG_MAIL)] = { "mail", N_("mail system") }, | |
97 | [FAC_BASE(LOG_DAEMON)] = { "daemon", N_("system daemons") }, | |
98 | [FAC_BASE(LOG_AUTH)] = { "auth", N_("security/authorization messages") }, | |
99 | [FAC_BASE(LOG_SYSLOG)] = { "syslog", N_("messages generated internally by syslogd") }, | |
100 | [FAC_BASE(LOG_LPR)] = { "lpr", N_("line printer subsystem") }, | |
101 | [FAC_BASE(LOG_NEWS)] = { "news", N_("network news subsystem") }, | |
102 | [FAC_BASE(LOG_UUCP)] = { "uucp", N_("UUCP subsystem") }, | |
103 | [FAC_BASE(LOG_CRON)] = { "cron", N_("clock daemon") }, | |
104 | [FAC_BASE(LOG_AUTHPRIV)] = { "authpriv", N_("security/authorization messages (private)") }, | |
105 | [FAC_BASE(LOG_FTP)] = { "ftp", N_("ftp daemon") }, | |
106 | }; | |
107 | ||
e6471b9f KZ |
108 | /* supported methods to read message buffer |
109 | */ | |
110 | enum { | |
7af23060 | 111 | DMESG_METHOD_KMSG, /* read messages from /dev/kmsg (default) */ |
e6471b9f KZ |
112 | DMESG_METHOD_SYSLOG, /* klogctl() buffer */ |
113 | DMESG_METHOD_MMAP /* mmap file with records (see --file) */ | |
114 | }; | |
115 | ||
aca1633a KZ |
116 | struct dmesg_control { |
117 | /* bit arrays -- see include/bitops.h */ | |
118 | char levels[ARRAY_SIZE(level_names) / NBBY + 1]; | |
119 | char facilities[ARRAY_SIZE(facility_names) / NBBY + 1]; | |
120 | ||
bd304d92 | 121 | struct timeval lasttime; /* last printed timestamp */ |
42fac79a | 122 | time_t boot_time; /* system boot time */ |
bd304d92 | 123 | |
e6471b9f KZ |
124 | int action; /* SYSLOG_ACTION_* */ |
125 | int method; /* DMESG_METHOD_* */ | |
126 | size_t bufsize; /* size of buffer created by read_buffer() */ | |
7af23060 | 127 | int kmsg; /* /dev/kmsg file descriptor */ |
e6471b9f | 128 | |
c672220f KZ |
129 | /* |
130 | * For the --file option we mmap whole file. The unnecessary (already | |
131 | * printed) pages are always unmapped. The result is that we have in | |
455fe9a0 | 132 | * memory only the currently used page(s). |
c672220f | 133 | */ |
9b3a6984 | 134 | char *filename; |
c672220f KZ |
135 | char *mmap_buff; |
136 | size_t pagesize; | |
137 | ||
9feec79c KZ |
138 | unsigned int raw:1, /* raw mode */ |
139 | fltr_lev:1, /* filter out by levels[] */ | |
140 | fltr_fac:1, /* filter out by facilities[] */ | |
141 | decode:1, /* use "facility: level: " prefix */ | |
142 | notime:1, /* don't print timestamp */ | |
143 | delta:1, /* show time deltas */ | |
144 | ctime:1; /* show human readable time */ | |
aca1633a | 145 | }; |
f4fa5b44 | 146 | |
a7ee94f2 KZ |
147 | struct dmesg_record { |
148 | const char *mesg; | |
149 | size_t mesg_size; | |
150 | ||
151 | int level; | |
152 | int facility; | |
bd304d92 | 153 | struct timeval tv; |
a7ee94f2 KZ |
154 | |
155 | const char *next; /* buffer with next unparsed record */ | |
156 | size_t next_size; /* size of the next buffer */ | |
157 | }; | |
158 | ||
4a3b7949 | 159 | static void __attribute__((__noreturn__)) usage(FILE *out) |
15103c4b | 160 | { |
738767b9 | 161 | size_t i; |
f06ec64f | 162 | |
dcd16b0f KZ |
163 | fputs(_("\nUsage:\n"), out); |
164 | fprintf(out, | |
165 | _(" %s [options]\n"), program_invocation_short_name); | |
166 | ||
167 | fputs(_("\nOptions:\n"), out); | |
168 | fputs(_(" -C, --clear clear the kernel ring buffer\n" | |
169 | " -c, --read-clear read and clear all messages\n" | |
170 | " -D, --console-off disable printing messages to console\n" | |
171 | " -d, --show-delta show time delta between printed messages\n" | |
172 | " -E, --console-on enable printing messages to console\n" | |
c672220f | 173 | " -F, --file <file> use the file instead of the kernel log buffer\n" |
dcd16b0f KZ |
174 | " -f, --facility <list> restrict output to defined facilities\n" |
175 | " -h, --help display this help and exit\n" | |
176 | " -k, --kernel display kernel messages\n" | |
177 | " -l, --level <list> restrict output to defined levels\n" | |
178 | " -n, --console-level <level> set level of messages printed to console\n" | |
179 | " -r, --raw print the raw message buffer\n" | |
ed61acc2 | 180 | " -S, --syslog force to use syslog(2) rather than /dev/kmsg\n" |
dcd16b0f KZ |
181 | " -s, --buffer-size <size> buffer size to query the kernel ring buffer\n" |
182 | " -T, --ctime show human readable timestamp (could be \n" | |
183 | " inaccurate if you have used SUSPEND/RESUME)\n" | |
184 | " -t, --notime don't print messages timestamp\n" | |
185 | " -u, --userspace display userspace messages\n" | |
186 | " -V, --version output version information and exit\n" | |
187 | " -x, --decode decode facility and level to readable string\n"), out); | |
188 | ||
189 | fputs(_("\nSupported log facilities:\n"), out); | |
f06ec64f | 190 | for (i = 0; i < ARRAY_SIZE(level_names); i++) { |
85f3cc55 KZ |
191 | fprintf(stderr, " %7s - %s\n", |
192 | facility_names[i].name, | |
193 | _(facility_names[i].help)); | |
194 | } | |
195 | ||
dcd16b0f | 196 | fputs(_("\nSupported log levels (priorities):\n"), out); |
85f3cc55 KZ |
197 | for (i = 0; i < ARRAY_SIZE(level_names); i++) { |
198 | fprintf(stderr, " %7s - %s\n", | |
f06ec64f KZ |
199 | level_names[i].name, |
200 | _(level_names[i].help)); | |
201 | } | |
202 | ||
203 | fputc('\n', out); | |
204 | ||
4a3b7949 | 205 | exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); |
6dbe3af9 KZ |
206 | } |
207 | ||
5ef05369 KZ |
208 | /* |
209 | * LEVEL ::= <number> | <name> | |
210 | * <number> ::= number in range <0..N>, where N < ARRAY_SIZE(level_names) | |
211 | * <name> ::= case-insensitive text | |
212 | */ | |
5c8f6bc6 | 213 | static int parse_level(const char *str, size_t len) |
f06ec64f | 214 | { |
5c8f6bc6 | 215 | if (!str) |
f06ec64f | 216 | return -1; |
5c8f6bc6 KZ |
217 | if (!len) |
218 | len = strlen(str); | |
219 | errno = 0; | |
f06ec64f | 220 | |
5c8f6bc6 KZ |
221 | if (isdigit(*str)) { |
222 | char *end = NULL; | |
738767b9 | 223 | long x = strtol(str, &end, 10); |
5c8f6bc6 | 224 | |
738767b9 KZ |
225 | if (!errno && end && end > str && (size_t) (end - str) == len && |
226 | x >= 0 && (size_t) x < ARRAY_SIZE(level_names)) | |
227 | return x; | |
5c8f6bc6 | 228 | } else { |
738767b9 KZ |
229 | size_t i; |
230 | ||
5c8f6bc6 KZ |
231 | for (i = 0; i < ARRAY_SIZE(level_names); i++) { |
232 | const char *n = level_names[i].name; | |
233 | ||
234 | if (strncasecmp(str, n, len) == 0 && *(n + len) == '\0') | |
235 | return i; | |
236 | } | |
237 | } | |
238 | ||
239 | if (errno) | |
240 | err(EXIT_FAILURE, _("failed to parse level '%s'"), str); | |
241 | ||
242 | errx(EXIT_FAILURE, _("unknown level '%s'"), str); | |
f06ec64f KZ |
243 | return -1; |
244 | } | |
245 | ||
5ef05369 KZ |
246 | /* |
247 | * FACILITY ::= <number> | <name> | |
248 | * <number> ::= number in range <0..N>, where N < ARRAY_SIZE(facility_names) | |
249 | * <name> ::= case-insensitive text | |
250 | */ | |
0e24df3b KZ |
251 | static int parse_facility(const char *str, size_t len) |
252 | { | |
0e24df3b KZ |
253 | if (!str) |
254 | return -1; | |
255 | if (!len) | |
256 | len = strlen(str); | |
257 | errno = 0; | |
258 | ||
259 | if (isdigit(*str)) { | |
260 | char *end = NULL; | |
738767b9 | 261 | long x = strtol(str, &end, 10); |
0e24df3b | 262 | |
738767b9 KZ |
263 | if (!errno && end && end > str && (size_t) (end - str) == len && |
264 | x >= 0 && (size_t) x < ARRAY_SIZE(facility_names)) | |
265 | return x; | |
0e24df3b | 266 | } else { |
738767b9 KZ |
267 | size_t i; |
268 | ||
0e24df3b KZ |
269 | for (i = 0; i < ARRAY_SIZE(facility_names); i++) { |
270 | const char *n = facility_names[i].name; | |
271 | ||
272 | if (strncasecmp(str, n, len) == 0 && *(n + len) == '\0') | |
273 | return i; | |
274 | } | |
275 | } | |
276 | ||
277 | if (errno) | |
278 | err(EXIT_FAILURE, _("failed to parse facility '%s'"), str); | |
279 | ||
280 | errx(EXIT_FAILURE, _("unknown facility '%s'"), str); | |
281 | return -1; | |
282 | } | |
283 | ||
5ef05369 KZ |
284 | /* |
285 | * Parses numerical prefix used for all messages in kernel ring buffer. | |
286 | * | |
287 | * Priorities/facilities are encoded into a single 32-bit quantity, where the | |
288 | * bottom 3 bits are the priority (0-7) and the top 28 bits are the facility | |
289 | * (0-big number). | |
290 | * | |
291 | * Note that the number has to end with '>' char. | |
292 | */ | |
636a6207 KZ |
293 | static const char *parse_faclev(const char *str, int *fac, int *lev) |
294 | { | |
295 | long num; | |
296 | char *end = NULL; | |
297 | ||
298 | if (!str) | |
299 | return str; | |
300 | ||
301 | errno = 0; | |
302 | num = strtol(str, &end, 10); | |
303 | ||
304 | if (!errno && end && end > str) { | |
305 | *fac = LOG_FAC(num); | |
306 | *lev = LOG_PRI(num); | |
85f3cc55 | 307 | |
738767b9 | 308 | if (*lev < 0 || (size_t) *lev > ARRAY_SIZE(level_names)) |
85f3cc55 | 309 | *lev = -1; |
738767b9 | 310 | if (*fac < 0 || (size_t) *fac > ARRAY_SIZE(facility_names)) |
85f3cc55 | 311 | *fac = -1; |
636a6207 KZ |
312 | return end + 1; /* skip '<' */ |
313 | } | |
314 | ||
315 | return str; | |
316 | } | |
317 | ||
bd304d92 KZ |
318 | static const char *parse_timestamp(const char *str0, struct timeval *tv) |
319 | { | |
320 | const char *str = str0; | |
321 | char *end = NULL; | |
322 | ||
323 | if (!str0) | |
324 | return str0; | |
325 | ||
326 | errno = 0; | |
327 | tv->tv_sec = strtol(str, &end, 10); | |
328 | ||
329 | if (!errno && end && *end == '.' && *(end + 1)) { | |
330 | str = end + 1; | |
331 | end = NULL; | |
332 | tv->tv_usec = strtol(str, &end, 10); | |
333 | } | |
334 | if (errno || !end || end == str || *end != ']') | |
335 | return str0; | |
336 | ||
337 | return end + 1; /* skip ']' */ | |
338 | } | |
339 | ||
340 | ||
341 | static double time_diff(struct timeval *a, struct timeval *b) | |
342 | { | |
343 | return (a->tv_sec - b->tv_sec) + (a->tv_usec - b->tv_usec) / 1E6; | |
344 | } | |
345 | ||
7ff1f63f | 346 | static int get_syslog_buffer_size(void) |
eed99b2a KZ |
347 | { |
348 | int n = klogctl(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0); | |
349 | ||
350 | return n > 0 ? n : 0; | |
351 | } | |
352 | ||
42fac79a KZ |
353 | static time_t get_boot_time(void) |
354 | { | |
355 | struct sysinfo info; | |
356 | struct timeval tv; | |
357 | ||
358 | if (sysinfo(&info) != 0) | |
359 | warn(_("sysinfo failed")); | |
360 | else if (gettimeofday(&tv, NULL) != 0) | |
361 | warn(_("gettimeofday failed")); | |
362 | else | |
363 | return tv.tv_sec -= info.uptime; | |
364 | return 0; | |
365 | } | |
366 | ||
c672220f | 367 | /* |
7ff1f63f | 368 | * Reads messages from regular file by mmap |
c672220f | 369 | */ |
7ff1f63f | 370 | static ssize_t mmap_file_buffer(struct dmesg_control *ctl, char **buf) |
c672220f KZ |
371 | { |
372 | struct stat st; | |
9b3a6984 | 373 | int fd; |
c672220f | 374 | |
9b3a6984 KZ |
375 | if (!ctl->filename) |
376 | return -1; | |
377 | ||
378 | fd = open(ctl->filename, O_RDONLY); | |
c672220f | 379 | if (fd < 0) |
9b3a6984 | 380 | err(EXIT_FAILURE, _("cannot open %s"), ctl->filename); |
c672220f | 381 | if (fstat(fd, &st)) |
9b3a6984 | 382 | err(EXIT_FAILURE, _("stat failed %s"), ctl->filename); |
c672220f KZ |
383 | |
384 | *buf = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0); | |
385 | if (*buf == MAP_FAILED) | |
9b3a6984 | 386 | err(EXIT_FAILURE, _("cannot mmap: %s"), ctl->filename); |
c672220f KZ |
387 | ctl->mmap_buff = *buf; |
388 | ctl->pagesize = getpagesize(); | |
389 | close(fd); | |
390 | ||
391 | return st.st_size; | |
392 | } | |
393 | ||
5ef05369 | 394 | /* |
7ff1f63f | 395 | * Reads messages from kernel ring buffer by klogctl() |
5ef05369 | 396 | */ |
7ff1f63f | 397 | static ssize_t read_syslog_buffer(struct dmesg_control *ctl, char **buf) |
65e3eed9 KZ |
398 | { |
399 | size_t sz; | |
400 | int rc = -1; | |
65e3eed9 | 401 | |
e6471b9f KZ |
402 | if (ctl->bufsize) { |
403 | sz = ctl->bufsize + 8; | |
65e3eed9 | 404 | *buf = xmalloc(sz * sizeof(char)); |
e6471b9f | 405 | rc = klogctl(ctl->action, *buf, sz); |
65e3eed9 KZ |
406 | } else { |
407 | sz = 16392; | |
408 | while (1) { | |
409 | *buf = xmalloc(sz * sizeof(char)); | |
410 | rc = klogctl(SYSLOG_ACTION_READ_ALL, *buf, sz); | |
738767b9 KZ |
411 | if (rc < 0) |
412 | break; | |
413 | if ((size_t) rc != sz || sz > (1 << 28)) | |
65e3eed9 KZ |
414 | break; |
415 | free(*buf); | |
416 | *buf = NULL; | |
417 | sz *= 4; | |
418 | } | |
419 | ||
e6471b9f | 420 | if (rc > 0 && ctl->action == SYSLOG_ACTION_READ_CLEAR) |
65e3eed9 KZ |
421 | rc = klogctl(SYSLOG_ACTION_READ_CLEAR, *buf, sz); |
422 | } | |
423 | ||
424 | return rc; | |
425 | } | |
426 | ||
7ff1f63f KZ |
427 | /* |
428 | * Top level function to read messages | |
429 | */ | |
e6471b9f KZ |
430 | static ssize_t read_buffer(struct dmesg_control *ctl, char **buf) |
431 | { | |
432 | ssize_t n = -1; | |
433 | ||
434 | switch (ctl->method) { | |
435 | case DMESG_METHOD_MMAP: | |
7ff1f63f | 436 | n = mmap_file_buffer(ctl, buf); |
e6471b9f KZ |
437 | break; |
438 | case DMESG_METHOD_SYSLOG: | |
439 | if (!ctl->bufsize) | |
7ff1f63f | 440 | ctl->bufsize = get_syslog_buffer_size(); |
e6471b9f | 441 | |
7ff1f63f | 442 | n = read_syslog_buffer(ctl, buf); |
e6471b9f KZ |
443 | break; |
444 | } | |
445 | ||
446 | return n; | |
447 | } | |
448 | ||
b8300c0a KZ |
449 | static int fwrite_hex(const char *buf, size_t size, FILE *out) |
450 | { | |
738767b9 | 451 | size_t i; |
b8300c0a KZ |
452 | |
453 | for (i = 0; i < size; i++) { | |
454 | int rc = fprintf(out, "\\x%02x", buf[i]); | |
455 | if (rc < 0) | |
456 | return rc; | |
457 | } | |
458 | return 0; | |
459 | } | |
460 | ||
5ef05369 KZ |
461 | /* |
462 | * Prints to 'out' and non-printable chars are replaced with \x<hex> sequences. | |
463 | */ | |
b8300c0a KZ |
464 | static void safe_fwrite(const char *buf, size_t size, FILE *out) |
465 | { | |
738767b9 | 466 | size_t i; |
b8300c0a KZ |
467 | #ifdef HAVE_WIDECHAR |
468 | mbstate_t s; | |
469 | memset(&s, 0, sizeof (s)); | |
470 | #endif | |
471 | for (i = 0; i < size; i++) { | |
472 | const char *p = buf + i; | |
473 | int rc, hex = 0; | |
0720766e | 474 | size_t len = 1; |
b8300c0a KZ |
475 | |
476 | #ifdef HAVE_WIDECHAR | |
477 | wchar_t wc; | |
0720766e | 478 | len = mbrtowc(&wc, p, size - i, &s); |
b8300c0a KZ |
479 | |
480 | if (len == 0) /* L'\0' */ | |
481 | return; | |
482 | ||
730d5e77 | 483 | if (len == (size_t)-1 || len == (size_t)-2) { /* invalid sequence */ |
b8300c0a KZ |
484 | memset(&s, 0, sizeof (s)); |
485 | len = hex = 1; | |
b8300c0a KZ |
486 | } else if (len > 1 && !iswprint(wc)) { /* non-printable multibyte */ |
487 | hex = 1; | |
b8300c0a | 488 | } |
0720766e PU |
489 | i += len - 1; |
490 | #else | |
491 | if (!isprint((unsigned int) *p) && | |
492 | !isspace((unsigned int) *p)) /* non-printable */ | |
493 | hex = 1; | |
494 | #endif | |
b8300c0a KZ |
495 | if (hex) |
496 | rc = fwrite_hex(p, len, out); | |
497 | else | |
85f3cc55 | 498 | rc = fwrite(p, 1, len, out) != len; |
b8300c0a KZ |
499 | if (rc != 0) |
500 | err(EXIT_FAILURE, _("write failed")); | |
501 | } | |
502 | } | |
503 | ||
7af23060 KZ |
504 | static int get_next_syslog_record(struct dmesg_control *ctl, |
505 | struct dmesg_record *rec) | |
f4fa5b44 | 506 | { |
738767b9 | 507 | size_t i; |
b8300c0a KZ |
508 | const char *begin = NULL; |
509 | ||
7af23060 KZ |
510 | if (ctl->method != DMESG_METHOD_MMAP && |
511 | ctl->method != DMESG_METHOD_SYSLOG) | |
512 | return -1; | |
513 | ||
a7ee94f2 KZ |
514 | if (!rec->next || !rec->next_size) |
515 | return 1; | |
f4fa5b44 | 516 | |
a7ee94f2 KZ |
517 | rec->mesg = NULL; |
518 | rec->mesg_size = 0; | |
519 | rec->facility = -1; | |
520 | rec->level = -1; | |
bd304d92 KZ |
521 | rec->tv.tv_sec = 0; |
522 | rec->tv.tv_usec = 0; | |
a7ee94f2 | 523 | |
c672220f KZ |
524 | /* |
525 | * Unmap already printed file data from memory | |
526 | */ | |
527 | if (ctl->mmap_buff && (size_t) (rec->next - ctl->mmap_buff) > ctl->pagesize) { | |
528 | void *x = ctl->mmap_buff; | |
529 | ||
530 | ctl->mmap_buff += ctl->pagesize; | |
531 | munmap(x, ctl->pagesize); | |
532 | } | |
533 | ||
a7ee94f2 KZ |
534 | for (i = 0; i < rec->next_size; i++) { |
535 | const char *p = rec->next + i; | |
536 | const char *end = NULL; | |
b8300c0a KZ |
537 | |
538 | if (!begin) | |
539 | begin = p; | |
a7ee94f2 | 540 | if (i + 1 == rec->next_size) { |
b8300c0a | 541 | end = p + 1; |
f4fa5b44 | 542 | i++; |
22f69825 KZ |
543 | } else if (*p == '\n' && *(p + 1) == '<') |
544 | end = p; | |
545 | ||
a7ee94f2 KZ |
546 | if (begin && !*begin) |
547 | begin = NULL; /* zero(s) at the end of the buffer? */ | |
b8300c0a KZ |
548 | if (!begin || !end) |
549 | continue; | |
550 | if (end <= begin) | |
551 | continue; /* error or empty line? */ | |
552 | ||
636a6207 | 553 | if (*begin == '<') { |
aca1633a | 554 | if (ctl->fltr_lev || ctl->fltr_fac || ctl->decode) { |
a7ee94f2 KZ |
555 | begin = parse_faclev(begin + 1, &rec->facility, |
556 | &rec->level); | |
636a6207 KZ |
557 | } else { |
558 | /* ignore facility and level */ | |
559 | while (begin < end) { | |
560 | begin++; | |
561 | if (*(begin - 1) == '>') | |
562 | break; | |
563 | } | |
b8300c0a KZ |
564 | } |
565 | } | |
566 | ||
bd304d92 KZ |
567 | if (*begin == '[' && (*(begin + 1) == ' ' || |
568 | isdigit(*(begin + 1)))) { | |
608d4501 KZ |
569 | if (ctl->delta || ctl->ctime) { |
570 | begin = parse_timestamp(begin + 1, &rec->tv); | |
571 | } else if (ctl->notime) { | |
bd304d92 KZ |
572 | while (begin < end) { |
573 | begin++; | |
574 | if (*(begin - 1) == ']') | |
575 | break; | |
576 | } | |
d74b8dfc | 577 | } |
31c9099a KZ |
578 | if (begin < end && *begin == ' ') |
579 | begin++; | |
a7ee94f2 | 580 | } |
d74b8dfc | 581 | |
a7ee94f2 KZ |
582 | rec->mesg = begin; |
583 | rec->mesg_size = end - begin; | |
b8300c0a | 584 | |
a7ee94f2 KZ |
585 | rec->next_size -= end - rec->next; |
586 | rec->next = rec->next_size > 0 ? end + 1 : NULL; | |
59202950 PU |
587 | if (rec->next_size > 0) |
588 | rec->next_size--; | |
a7ee94f2 KZ |
589 | |
590 | return 0; | |
591 | } | |
592 | ||
593 | return 1; | |
594 | } | |
595 | ||
596 | static int accept_record(struct dmesg_control *ctl, struct dmesg_record *rec) | |
597 | { | |
598 | if (ctl->fltr_lev && (rec->facility < 0 || | |
599 | !isset(ctl->levels, rec->level))) | |
600 | return 0; | |
601 | ||
602 | if (ctl->fltr_fac && (rec->facility < 0 || | |
603 | !isset(ctl->facilities, rec->facility))) | |
604 | return 0; | |
605 | ||
606 | return 1; | |
607 | } | |
608 | ||
7ff1f63f | 609 | static void raw_print(struct dmesg_control *ctl, const char *buf, size_t size) |
c672220f KZ |
610 | { |
611 | int lastc = '\n'; | |
612 | ||
613 | if (!ctl->mmap_buff) { | |
614 | /* | |
615 | * Print whole ring buffer | |
616 | */ | |
617 | safe_fwrite(buf, size, stdout); | |
618 | lastc = buf[size - 1]; | |
619 | } else { | |
620 | /* | |
621 | * Print file in small chunks to save memory | |
622 | */ | |
623 | while (size) { | |
624 | size_t sz = size > ctl->pagesize ? ctl->pagesize : size; | |
625 | char *x = ctl->mmap_buff; | |
626 | ||
627 | safe_fwrite(x, sz, stdout); | |
628 | lastc = x[sz - 1]; | |
629 | size -= sz; | |
630 | ctl->mmap_buff += sz; | |
631 | munmap(x, sz); | |
632 | } | |
633 | } | |
634 | ||
635 | if (lastc != '\n') | |
636 | putchar('\n'); | |
637 | } | |
638 | ||
7af23060 KZ |
639 | static void print_record(struct dmesg_control *ctl, struct dmesg_record *rec) |
640 | { | |
641 | char tbuf[256]; | |
642 | ||
643 | if (!accept_record(ctl, rec)) | |
644 | return; | |
645 | ||
646 | if (!rec->mesg_size) { | |
647 | putchar('\n'); | |
648 | return; | |
649 | } | |
650 | ||
651 | if (ctl->decode && rec->level >= 0 && rec->facility >= 0) | |
652 | printf("%-6s:%-6s: ", facility_names[rec->facility].name, | |
653 | level_names[rec->level].name); | |
654 | ||
655 | *tbuf = '\0'; | |
656 | if (ctl->ctime) { | |
657 | time_t t = ctl->boot_time + rec->tv.tv_sec; | |
658 | if (strftime(tbuf, sizeof(tbuf), "%a %b %e %H:%M:%S %Y", | |
659 | localtime(&t)) == 0) | |
660 | *tbuf = '\0'; | |
661 | } | |
662 | if (ctl->delta) { | |
663 | double delta = 0; | |
664 | ||
665 | if (timerisset(&ctl->lasttime)) | |
666 | delta = time_diff(&rec->tv, &ctl->lasttime); | |
667 | ctl->lasttime = rec->tv; | |
668 | ||
669 | if (ctl->ctime && *tbuf) | |
670 | printf("[%s ", tbuf); | |
671 | else if (ctl->notime) | |
672 | putchar('['); | |
673 | else | |
674 | printf("[%5d.%06d ", (int) rec->tv.tv_sec, | |
675 | (int) rec->tv.tv_usec); | |
676 | printf("<%12.06f>] ", delta); | |
677 | } else if (ctl->ctime && *tbuf) { | |
678 | printf("[%s] ", tbuf); | |
679 | } | |
680 | ||
681 | safe_fwrite(rec->mesg, rec->mesg_size, stdout); | |
682 | ||
683 | if (*(rec->mesg + rec->mesg_size - 1) != '\n') | |
684 | putchar('\n'); | |
685 | } | |
686 | ||
a7ee94f2 KZ |
687 | /* |
688 | * Prints the 'buf' kernel ring buffer; the messages are filtered out according | |
689 | * to 'levels' and 'facilities' bitarrays. | |
690 | */ | |
7ff1f63f KZ |
691 | static void print_buffer(struct dmesg_control *ctl, |
692 | const char *buf, size_t size) | |
a7ee94f2 KZ |
693 | { |
694 | struct dmesg_record rec = { .next = buf, .next_size = size }; | |
695 | ||
696 | if (ctl->raw) { | |
7ff1f63f | 697 | raw_print(ctl, buf, size); |
a7ee94f2 KZ |
698 | return; |
699 | } | |
700 | ||
7af23060 KZ |
701 | while (get_next_syslog_record(ctl, &rec) == 0) |
702 | print_record(ctl, &rec); | |
703 | } | |
a7ee94f2 | 704 | |
7af23060 KZ |
705 | static int init_kmsg(struct dmesg_control *ctl) |
706 | { | |
707 | ctl->kmsg = open("/dev/kmsg", O_RDONLY|O_NONBLOCK); | |
708 | return ctl->kmsg < 0 ? -1 : 0; | |
f4fa5b44 KZ |
709 | } |
710 | ||
15103c4b MP |
711 | int main(int argc, char *argv[]) |
712 | { | |
713 | char *buf = NULL; | |
c672220f | 714 | ssize_t n; |
df1dddf9 | 715 | int c; |
48c5c662 | 716 | int console_level = 0; |
9b3a6984 | 717 | static struct dmesg_control ctl = { |
e6471b9f | 718 | .filename = NULL, |
7ff1f63f | 719 | .action = SYSLOG_ACTION_READ_ALL, |
ed61acc2 | 720 | .method = DMESG_METHOD_KMSG, |
7af23060 | 721 | .kmsg = -1, |
9b3a6984 | 722 | }; |
6dbe3af9 | 723 | |
94920134 SK |
724 | enum { |
725 | EXCL_NONE, | |
726 | EXCL_CLEAR, | |
727 | EXCL_READ_CLEAR, | |
728 | EXCL_CONSOLE_LEVEL, | |
729 | EXCL_CONSOLE_ON, | |
730 | EXCL_CONSOLE_OFF | |
731 | }; | |
732 | int excl_any = EXCL_NONE; | |
733 | ||
4a3b7949 | 734 | static const struct option longopts[] = { |
4a3b7949 | 735 | { "buffer-size", required_argument, NULL, 's' }, |
5ef05369 | 736 | { "clear", no_argument, NULL, 'C' }, |
4a3b7949 | 737 | { "console-level", required_argument, NULL, 'n' }, |
bd304d92 KZ |
738 | { "console-off", no_argument, NULL, 'D' }, |
739 | { "console-on", no_argument, NULL, 'E' }, | |
5ef05369 | 740 | { "decode", no_argument, NULL, 'x' }, |
c672220f | 741 | { "file", required_argument, NULL, 'F' }, |
0e24df3b | 742 | { "facility", required_argument, NULL, 'f' }, |
4a3b7949 | 743 | { "help", no_argument, NULL, 'h' }, |
25000180 | 744 | { "kernel", no_argument, NULL, 'k' }, |
5ef05369 | 745 | { "level", required_argument, NULL, 'l' }, |
ed61acc2 | 746 | { "syslog", no_argument, NULL, 'S' }, |
5ef05369 KZ |
747 | { "raw", no_argument, NULL, 'r' }, |
748 | { "read-clear", no_argument, NULL, 'c' }, | |
bd304d92 | 749 | { "show-delta", no_argument, NULL, 'd' }, |
42fac79a | 750 | { "ctime", no_argument, NULL, 'T' }, |
d74b8dfc | 751 | { "notime", no_argument, NULL, 't' }, |
25000180 | 752 | { "userspace", no_argument, NULL, 'u' }, |
5ef05369 | 753 | { "version", no_argument, NULL, 'V' }, |
4a3b7949 KZ |
754 | { NULL, 0, NULL, 0 } |
755 | }; | |
756 | ||
df1dddf9 KZ |
757 | setlocale(LC_ALL, ""); |
758 | bindtextdomain(PACKAGE, LOCALEDIR); | |
759 | textdomain(PACKAGE); | |
efb8854f | 760 | atexit(close_stdout); |
7eda085c | 761 | |
ed61acc2 | 762 | while ((c = getopt_long(argc, argv, "CcDdEF:f:hkl:n:rSs:TtuVx", |
aca1633a | 763 | longopts, NULL)) != -1) { |
df1dddf9 | 764 | switch (c) { |
04199860 | 765 | case 'C': |
94920134 | 766 | exclusive_option(&excl_any, EXCL_CLEAR, EXCL_ERROR); |
e6471b9f | 767 | ctl.action = SYSLOG_ACTION_CLEAR; |
04199860 | 768 | break; |
df1dddf9 | 769 | case 'c': |
94920134 | 770 | exclusive_option(&excl_any, EXCL_READ_CLEAR, EXCL_ERROR); |
e6471b9f | 771 | ctl.action = SYSLOG_ACTION_READ_CLEAR; |
df1dddf9 | 772 | break; |
bd304d92 | 773 | case 'D': |
94920134 | 774 | exclusive_option(&excl_any, EXCL_CONSOLE_OFF, EXCL_ERROR); |
e6471b9f | 775 | ctl.action = SYSLOG_ACTION_CONSOLE_OFF; |
2170174e | 776 | break; |
bd304d92 KZ |
777 | case 'd': |
778 | ctl.delta = 1; | |
779 | break; | |
780 | case 'E': | |
94920134 | 781 | exclusive_option(&excl_any, EXCL_CONSOLE_ON, EXCL_ERROR); |
e6471b9f | 782 | ctl.action = SYSLOG_ACTION_CONSOLE_ON; |
2170174e | 783 | break; |
c672220f | 784 | case 'F': |
9b3a6984 | 785 | ctl.filename = optarg; |
e6471b9f | 786 | ctl.method = DMESG_METHOD_MMAP; |
c672220f | 787 | break; |
0e24df3b | 788 | case 'f': |
aca1633a | 789 | ctl.fltr_fac = 1; |
c87638ad KZ |
790 | if (string_to_bitarray(optarg, |
791 | ctl.facilities, parse_facility) < 0) | |
792 | return EXIT_FAILURE; | |
0e24df3b | 793 | break; |
5ef05369 KZ |
794 | case 'h': |
795 | usage(stdout); | |
df1dddf9 | 796 | break; |
25000180 | 797 | case 'k': |
aca1633a KZ |
798 | ctl.fltr_fac = 1; |
799 | setbit(ctl.facilities, FAC_BASE(LOG_KERN)); | |
25000180 | 800 | break; |
636a6207 | 801 | case 'l': |
aca1633a | 802 | ctl.fltr_lev= 1; |
c87638ad KZ |
803 | if (string_to_bitarray(optarg, |
804 | ctl.levels, parse_level) < 0) | |
805 | return EXIT_FAILURE; | |
636a6207 | 806 | break; |
5ef05369 | 807 | case 'n': |
94920134 | 808 | exclusive_option(&excl_any, EXCL_CONSOLE_LEVEL, EXCL_ERROR); |
e6471b9f | 809 | ctl.action = SYSLOG_ACTION_CONSOLE_LEVEL; |
5ef05369 KZ |
810 | console_level = parse_level(optarg, 0); |
811 | break; | |
11ea22d5 | 812 | case 'r': |
aca1633a | 813 | ctl.raw = 1; |
11ea22d5 | 814 | break; |
ed61acc2 KZ |
815 | case 'S': |
816 | ctl.method = DMESG_METHOD_SYSLOG; | |
817 | break; | |
df1dddf9 | 818 | case 's': |
e6471b9f KZ |
819 | ctl.bufsize = strtou32_or_err(optarg, |
820 | _("invalid buffer size argument")); | |
821 | if (ctl.bufsize < 4096) | |
822 | ctl.bufsize = 4096; | |
df1dddf9 | 823 | break; |
42fac79a KZ |
824 | case 'T': |
825 | ctl.boot_time = get_boot_time(); | |
826 | if (ctl.boot_time) | |
827 | ctl.ctime = 1; | |
828 | break; | |
d74b8dfc | 829 | case 't': |
aca1633a | 830 | ctl.notime = 1; |
d74b8dfc | 831 | break; |
25000180 | 832 | case 'u': |
aca1633a | 833 | ctl.fltr_fac = 1; |
738767b9 | 834 | for (n = 1; (size_t) n < ARRAY_SIZE(facility_names); n++) |
aca1633a | 835 | setbit(ctl.facilities, n); |
25000180 | 836 | break; |
4a3b7949 KZ |
837 | case 'V': |
838 | printf(_("%s from %s\n"), program_invocation_short_name, | |
839 | PACKAGE_STRING); | |
840 | return EXIT_SUCCESS; | |
5ef05369 | 841 | case 'x': |
aca1633a | 842 | ctl.decode = 1; |
4a3b7949 | 843 | break; |
df1dddf9 KZ |
844 | case '?': |
845 | default: | |
4a3b7949 | 846 | usage(stderr); |
df1dddf9 KZ |
847 | } |
848 | } | |
849 | argc -= optind; | |
850 | argv += optind; | |
25000180 | 851 | n = 0; |
e6c379eb | 852 | |
15103c4b | 853 | if (argc > 1) |
4a3b7949 | 854 | usage(stderr); |
6dbe3af9 | 855 | |
641986cf KZ |
856 | if (ctl.raw && (ctl.fltr_lev || ctl.fltr_fac || ctl.delta || |
857 | ctl.notime || ctl.ctime || ctl.decode)) | |
858 | errx(EXIT_FAILURE, _("--raw can't be used together with level, " | |
859 | "facility, decode, delta, ctime or notime options")); | |
860 | ||
608d4501 KZ |
861 | if (ctl.notime && ctl.ctime) |
862 | errx(EXIT_FAILURE, _("--notime can't be used together with ctime ")); | |
85f3cc55 | 863 | |
e6471b9f | 864 | switch (ctl.action) { |
48c5c662 KZ |
865 | case SYSLOG_ACTION_READ_ALL: |
866 | case SYSLOG_ACTION_READ_CLEAR: | |
7af23060 KZ |
867 | if (ctl.method == DMESG_METHOD_KMSG && init_kmsg(&ctl) != 0) |
868 | ctl.method = DMESG_METHOD_SYSLOG; | |
869 | ||
e6471b9f | 870 | n = read_buffer(&ctl, &buf); |
48c5c662 | 871 | if (n > 0) |
7ff1f63f | 872 | print_buffer(&ctl, buf, n); |
7ff1f63f | 873 | if (!ctl.mmap_buff) |
c672220f | 874 | free(buf); |
48c5c662 | 875 | break; |
04199860 | 876 | case SYSLOG_ACTION_CLEAR: |
2170174e KZ |
877 | case SYSLOG_ACTION_CONSOLE_OFF: |
878 | case SYSLOG_ACTION_CONSOLE_ON: | |
e6471b9f | 879 | n = klogctl(ctl.action, NULL, 0); |
04199860 | 880 | break; |
48c5c662 | 881 | case SYSLOG_ACTION_CONSOLE_LEVEL: |
e6471b9f | 882 | n = klogctl(ctl.action, NULL, console_level); |
48c5c662 KZ |
883 | break; |
884 | default: | |
885 | errx(EXIT_FAILURE, _("unsupported command")); | |
886 | break; | |
df1dddf9 | 887 | } |
6dbe3af9 | 888 | |
7af23060 KZ |
889 | if (ctl.kmsg >= 0) |
890 | close(ctl.kmsg); | |
891 | ||
7ff1f63f | 892 | if (n < 0 && ctl.method == DMESG_METHOD_SYSLOG) |
15103c4b | 893 | err(EXIT_FAILURE, _("klogctl failed")); |
6dbe3af9 | 894 | |
15103c4b | 895 | return EXIT_SUCCESS; |
6dbe3af9 | 896 | } |