2 * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
27 #include <sys/types.h>
32 #include "dynamic-string.h"
39 VLOG_DEFINE_THIS_MODULE(vlog);
41 /* Name for each logging level. */
42 static const char *level_names[VLL_N_LEVELS] = {
43 #define VLOG_LEVEL(NAME, SYSLOG_LEVEL) #NAME,
48 /* Syslog value for each logging level. */
49 static int syslog_levels[VLL_N_LEVELS] = {
50 #define VLOG_LEVEL(NAME, SYSLOG_LEVEL) SYSLOG_LEVEL,
55 /* The log modules. */
56 #if USE_LINKER_SECTIONS
57 extern struct vlog_module *__start_vlog_modules[];
58 extern struct vlog_module *__stop_vlog_modules[];
59 #define vlog_modules __start_vlog_modules
60 #define n_vlog_modules (__stop_vlog_modules - __start_vlog_modules)
62 #define VLOG_MODULE VLOG_DEFINE_MODULE__
63 #include "vlog-modules.def"
66 struct vlog_module *vlog_modules[] = {
67 #define VLOG_MODULE(NAME) &VLM_##NAME,
68 #include "vlog-modules.def"
71 #define n_vlog_modules ARRAY_SIZE(vlog_modules)
74 /* Information about each facility. */
76 const char *name; /* Name. */
77 char *pattern; /* Current pattern. */
78 bool default_pattern; /* Whether current pattern is the default. */
80 static struct facility facilities[VLF_N_FACILITIES] = {
81 #define VLOG_FACILITY(NAME, PATTERN) {#NAME, PATTERN, true},
86 /* VLF_FILE configuration. */
87 static char *log_file_name;
88 static int log_fd = -1;
90 /* vlog initialized? */
91 static bool vlog_inited;
93 static void format_log_message(const struct vlog_module *, enum vlog_level,
94 enum vlog_facility, unsigned int msg_num,
95 const char *message, va_list, struct ds *)
98 /* Searches the 'n_names' in 'names'. Returns the index of a match for
99 * 'target', or 'n_names' if no name matches. */
101 search_name_array(const char *target, const char **names, size_t n_names)
105 for (i = 0; i < n_names; i++) {
107 if (!strcasecmp(names[i], target)) {
114 /* Returns the name for logging level 'level'. */
116 vlog_get_level_name(enum vlog_level level)
118 assert(level < VLL_N_LEVELS);
119 return level_names[level];
122 /* Returns the logging level with the given 'name', or VLL_N_LEVELS if 'name'
123 * is not the name of a logging level. */
125 vlog_get_level_val(const char *name)
127 return search_name_array(name, level_names, ARRAY_SIZE(level_names));
130 /* Returns the name for logging facility 'facility'. */
132 vlog_get_facility_name(enum vlog_facility facility)
134 assert(facility < VLF_N_FACILITIES);
135 return facilities[facility].name;
138 /* Returns the logging facility named 'name', or VLF_N_FACILITIES if 'name' is
139 * not the name of a logging facility. */
141 vlog_get_facility_val(const char *name)
145 for (i = 0; i < VLF_N_FACILITIES; i++) {
146 if (!strcasecmp(facilities[i].name, name)) {
153 /* Returns the name for logging module 'module'. */
155 vlog_get_module_name(const struct vlog_module *module)
160 /* Returns the logging module named 'name', or NULL if 'name' is not the name
161 * of a logging module. */
163 vlog_module_from_name(const char *name)
165 struct vlog_module **mp;
167 for (mp = vlog_modules; mp < &vlog_modules[n_vlog_modules]; mp++) {
168 if (!strcasecmp(name, (*mp)->name)) {
175 /* Returns the current logging level for the given 'module' and 'facility'. */
177 vlog_get_level(const struct vlog_module *module, enum vlog_facility facility)
179 assert(facility < VLF_N_FACILITIES);
180 return module->levels[facility];
184 update_min_level(struct vlog_module *module)
186 enum vlog_facility facility;
188 module->min_level = VLL_OFF;
189 for (facility = 0; facility < VLF_N_FACILITIES; facility++) {
190 if (log_fd >= 0 || facility != VLF_FILE) {
191 enum vlog_level level = module->levels[facility];
192 if (level > module->min_level) {
193 module->min_level = level;
200 set_facility_level(enum vlog_facility facility, struct vlog_module *module,
201 enum vlog_level level)
203 assert(facility >= 0 && facility < VLF_N_FACILITIES);
204 assert(level < VLL_N_LEVELS);
207 struct vlog_module **mp;
209 for (mp = vlog_modules; mp < &vlog_modules[n_vlog_modules]; mp++) {
210 (*mp)->levels[facility] = level;
211 update_min_level(*mp);
214 module->levels[facility] = level;
215 update_min_level(module);
219 /* Sets the logging level for the given 'module' and 'facility' to 'level'. A
220 * null 'module' or a 'facility' of VLF_ANY_FACILITY is treated as a wildcard
221 * across all modules or facilities, respectively. */
223 vlog_set_levels(struct vlog_module *module, enum vlog_facility facility,
224 enum vlog_level level)
226 assert(facility < VLF_N_FACILITIES || facility == VLF_ANY_FACILITY);
227 if (facility == VLF_ANY_FACILITY) {
228 for (facility = 0; facility < VLF_N_FACILITIES; facility++) {
229 set_facility_level(facility, module, level);
232 set_facility_level(facility, module, level);
237 do_set_pattern(enum vlog_facility facility, const char *pattern)
239 struct facility *f = &facilities[facility];
240 if (!f->default_pattern) {
243 f->default_pattern = false;
245 f->pattern = xstrdup(pattern);
248 /* Sets the pattern for the given 'facility' to 'pattern'. */
250 vlog_set_pattern(enum vlog_facility facility, const char *pattern)
252 assert(facility < VLF_N_FACILITIES || facility == VLF_ANY_FACILITY);
253 if (facility == VLF_ANY_FACILITY) {
254 for (facility = 0; facility < VLF_N_FACILITIES; facility++) {
255 do_set_pattern(facility, pattern);
258 do_set_pattern(facility, pattern);
262 /* Returns the name of the log file used by VLF_FILE, or a null pointer if no
263 * log file has been set. (A non-null return value does not assert that the
264 * named log file is in use: if vlog_set_log_file() or vlog_reopen_log_file()
265 * fails, it still sets the log file name.) */
267 vlog_get_log_file(void)
269 return log_file_name;
272 /* Sets the name of the log file used by VLF_FILE to 'file_name', or to the
273 * default file name if 'file_name' is null. Returns 0 if successful,
274 * otherwise a positive errno value. */
276 vlog_set_log_file(const char *file_name)
278 char *old_log_file_name;
279 struct vlog_module **mp;
282 /* Close old log file. */
284 VLOG_INFO("closing log file");
289 /* Update log file name and free old name. The ordering is important
290 * because 'file_name' might be 'log_file_name' or some suffix of it. */
291 old_log_file_name = log_file_name;
292 log_file_name = (file_name
294 : xasprintf("%s/%s.log", ovs_logdir(), program_name));
295 free(old_log_file_name);
296 file_name = NULL; /* Might have been freed. */
298 /* Open new log file and update min_levels[] to reflect whether we actually
299 * have a log_file. */
300 log_fd = open(log_file_name, O_WRONLY | O_CREAT | O_APPEND, 0666);
301 for (mp = vlog_modules; mp < &vlog_modules[n_vlog_modules]; mp++) {
302 update_min_level(*mp);
305 /* Log success or failure. */
307 VLOG_WARN("failed to open %s for logging: %s",
308 log_file_name, strerror(errno));
311 VLOG_INFO("opened log file %s", log_file_name);
318 /* Closes and then attempts to re-open the current log file. (This is useful
319 * just after log rotation, to ensure that the new log file starts being used.)
320 * Returns 0 if successful, otherwise a positive errno value. */
322 vlog_reopen_log_file(void)
324 struct stat old, new;
326 /* Skip re-opening if there's nothing to reopen. */
327 if (!log_file_name) {
331 /* Skip re-opening if it would be a no-op because the old and new files are
332 * the same. (This avoids writing "closing log file" followed immediately
333 * by "opened log file".) */
335 && !fstat(log_fd, &old)
336 && !stat(log_file_name, &new)
337 && old.st_dev == new.st_dev
338 && old.st_ino == new.st_ino) {
342 return vlog_set_log_file(log_file_name);
345 /* Set debugging levels. Returns null if successful, otherwise an error
346 * message that the caller must free(). */
348 vlog_set_levels_from_string(const char *s_)
350 char *s = xstrdup(s_);
351 char *save_ptr = NULL;
355 word = strtok_r(s, " ,:\t", &save_ptr);
356 if (word && !strcasecmp(word, "PATTERN")) {
357 enum vlog_facility facility;
359 word = strtok_r(NULL, " ,:\t", &save_ptr);
361 msg = xstrdup("missing facility");
365 facility = (!strcasecmp(word, "ANY")
367 : vlog_get_facility_val(word));
368 if (facility == VLF_N_FACILITIES) {
369 msg = xasprintf("unknown facility \"%s\"", word);
372 vlog_set_pattern(facility, save_ptr);
374 struct vlog_module *module = NULL;
375 enum vlog_level level = VLL_N_LEVELS;
376 enum vlog_facility facility = VLF_N_FACILITIES;
378 for (; word != NULL; word = strtok_r(NULL, " ,:\t", &save_ptr)) {
379 if (!strcasecmp(word, "ANY")) {
381 } else if (vlog_get_facility_val(word) != VLF_N_FACILITIES) {
382 if (facility != VLF_N_FACILITIES) {
383 msg = xstrdup("cannot specify multiple facilities");
386 facility = vlog_get_facility_val(word);
387 } else if (vlog_get_level_val(word) != VLL_N_LEVELS) {
388 if (level != VLL_N_LEVELS) {
389 msg = xstrdup("cannot specify multiple levels");
392 level = vlog_get_level_val(word);
393 } else if (vlog_module_from_name(word)) {
395 msg = xstrdup("cannot specify multiple modules");
398 module = vlog_module_from_name(word);
400 msg = xasprintf("no facility, level, or module \"%s\"", word);
405 if (facility == VLF_N_FACILITIES) {
406 facility = VLF_ANY_FACILITY;
408 if (level == VLL_N_LEVELS) {
411 vlog_set_levels(module, facility, level);
419 /* If 'arg' is null, configure maximum verbosity. Otherwise, sets
420 * configuration according to 'arg' (see vlog_set_levels_from_string()). */
422 vlog_set_verbosity(const char *arg)
425 char *msg = vlog_set_levels_from_string(arg);
427 ovs_fatal(0, "processing \"%s\": %s", arg, msg);
430 vlog_set_levels(NULL, VLF_ANY_FACILITY, VLL_DBG);
435 vlog_unixctl_set(struct unixctl_conn *conn, int argc, const char *argv[],
436 void *aux OVS_UNUSED)
440 for (i = 1; i < argc; i++) {
441 char *msg = vlog_set_levels_from_string(argv[i]);
443 unixctl_command_reply_error(conn, msg);
448 unixctl_command_reply(conn, NULL);
452 vlog_unixctl_list(struct unixctl_conn *conn, int argc OVS_UNUSED,
453 const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
455 char *msg = vlog_get_levels();
456 unixctl_command_reply(conn, msg);
461 vlog_unixctl_reopen(struct unixctl_conn *conn, int argc OVS_UNUSED,
462 const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
465 int error = vlog_reopen_log_file();
467 unixctl_command_reply_error(conn, strerror(errno));
469 unixctl_command_reply(conn, NULL);
472 unixctl_command_reply_error(conn, "Logging to file not configured");
476 /* Initializes the logging subsystem and registers its unixctl server
481 static char *program_name_copy;
489 /* openlog() is allowed to keep the pointer passed in, without making a
490 * copy. The daemonize code sometimes frees and replaces 'program_name',
491 * so make a private copy just for openlog(). (We keep a pointer to the
492 * private copy to suppress memory leak warnings in case openlog() does
493 * make its own copy.) */
494 program_name_copy = program_name ? xstrdup(program_name) : NULL;
495 openlog(program_name_copy, LOG_NDELAY, LOG_DAEMON);
503 strftime(s, sizeof s, "%a, %d %b %Y %H:%M:%S", &tm);
504 VLOG_ERR("current time is negative: %s (%ld)", s, (long int) now);
507 unixctl_command_register(
508 "vlog/set", "{spec | PATTERN:facility:pattern}",
509 1, INT_MAX, vlog_unixctl_set, NULL);
510 unixctl_command_register("vlog/list", "", 0, 0, vlog_unixctl_list, NULL);
511 unixctl_command_register("vlog/reopen", "", 0, 0,
512 vlog_unixctl_reopen, NULL);
515 /* Closes the logging subsystem. */
525 /* Print the current logging level for each module. */
527 vlog_get_levels(void)
529 struct ds s = DS_EMPTY_INITIALIZER;
530 struct vlog_module **mp;
531 struct svec lines = SVEC_EMPTY_INITIALIZER;
535 ds_put_format(&s, " console syslog file\n");
536 ds_put_format(&s, " ------- ------ ------\n");
538 for (mp = vlog_modules; mp < &vlog_modules[n_vlog_modules]; mp++) {
539 line = xasprintf("%-16s %4s %4s %4s\n",
540 vlog_get_module_name(*mp),
541 vlog_get_level_name(vlog_get_level(*mp, VLF_CONSOLE)),
542 vlog_get_level_name(vlog_get_level(*mp, VLF_SYSLOG)),
543 vlog_get_level_name(vlog_get_level(*mp, VLF_FILE)));
544 svec_add_nocopy(&lines, line);
548 SVEC_FOR_EACH (i, line, &lines) {
549 ds_put_cstr(&s, line);
551 svec_destroy(&lines);
556 /* Returns true if a log message emitted for the given 'module' and 'level'
557 * would cause some log output, false if that module and level are completely
560 vlog_is_enabled(const struct vlog_module *module, enum vlog_level level)
562 return module->min_level >= level;
566 fetch_braces(const char *p, const char *def, char *out, size_t out_size)
569 size_t n = strcspn(p + 1, "}");
570 size_t n_copy = MIN(n, out_size - 1);
571 memcpy(out, p + 1, n_copy);
575 ovs_strlcpy(out, def, out_size);
581 format_log_message(const struct vlog_module *module, enum vlog_level level,
582 enum vlog_facility facility, unsigned int msg_num,
583 const char *message, va_list args_, struct ds *s)
590 for (p = facilities[facility].pattern; *p != '\0'; ) {
591 enum { LEFT, RIGHT } justify = RIGHT;
593 size_t length, field, used;
596 ds_put_char(s, *p++);
610 while (isdigit((unsigned char)*p)) {
611 field = (field * 10) + (*p - '0');
618 ds_put_cstr(s, program_name);
621 p = fetch_braces(p, "", tmp, sizeof tmp);
622 ds_put_cstr(s, vlog_get_module_name(module));
625 p = fetch_braces(p, "%Y-%m-%d %H:%M:%S", tmp, sizeof tmp);
626 ds_put_strftime(s, tmp, false);
629 p = fetch_braces(p, "%Y-%m-%d %H:%M:%S", tmp, sizeof tmp);
630 ds_put_strftime(s, tmp, true);
633 /* Format user-supplied log message and trim trailing new-lines. */
635 va_copy(args, args_);
636 ds_put_format_valist(s, message, args);
638 while (s->length > length && s->string[s->length - 1] == '\n') {
643 ds_put_format(s, "%u", msg_num);
646 ds_put_char(s, '\n');
649 ds_put_cstr(s, vlog_get_level_name(level));
652 ds_put_format(s, "%ld", (long int) getpid());
655 ds_put_format(s, "%lld", time_msec() - time_boot_msec());
658 ds_put_cstr(s, subprogram_name[0] ? subprogram_name : "main");
661 if (subprogram_name[0]) {
662 ds_put_format(s, "(%s)", subprogram_name);
666 ds_put_char(s, p[-1]);
669 used = s->length - length;
671 size_t n_pad = field - used;
672 if (justify == RIGHT) {
673 ds_put_uninit(s, n_pad);
674 memmove(&s->string[length + n_pad], &s->string[length], used);
675 memset(&s->string[length], pad, n_pad);
677 ds_put_char_multiple(s, pad, n_pad);
683 /* Writes 'message' to the log at the given 'level' and as coming from the
686 * Guaranteed to preserve errno. */
688 vlog_valist(const struct vlog_module *module, enum vlog_level level,
689 const char *message, va_list args)
691 bool log_to_console = module->levels[VLF_CONSOLE] >= level;
692 bool log_to_syslog = module->levels[VLF_SYSLOG] >= level;
693 bool log_to_file = module->levels[VLF_FILE] >= level && log_fd >= 0;
694 if (log_to_console || log_to_syslog || log_to_file) {
695 int save_errno = errno;
696 static unsigned int msg_num;
702 ds_reserve(&s, 1024);
705 if (log_to_console) {
706 format_log_message(module, level, VLF_CONSOLE, msg_num,
708 ds_put_char(&s, '\n');
709 fputs(ds_cstr(&s), stderr);
713 int syslog_level = syslog_levels[level];
714 char *save_ptr = NULL;
717 format_log_message(module, level, VLF_SYSLOG, msg_num,
719 for (line = strtok_r(s.string, "\n", &save_ptr); line;
720 line = strtok_r(NULL, "\n", &save_ptr)) {
721 syslog(syslog_level, "%s", line);
726 format_log_message(module, level, VLF_FILE, msg_num,
728 ds_put_char(&s, '\n');
729 write(log_fd, s.string, s.length);
738 vlog(const struct vlog_module *module, enum vlog_level level,
739 const char *message, ...)
743 va_start(args, message);
744 vlog_valist(module, level, message, args);
748 /* Logs 'message' to 'module' at maximum verbosity, then exits with a failure
749 * exit code. Always writes the message to stderr, even if the console
750 * facility is disabled.
752 * Choose this function instead of vlog_abort_valist() if the daemon monitoring
753 * facility shouldn't automatically restart the current daemon. */
755 vlog_fatal_valist(const struct vlog_module *module_,
756 const char *message, va_list args)
758 struct vlog_module *module = (struct vlog_module *) module_;
760 /* Don't log this message to the console to avoid redundancy with the
761 * message written by the later ovs_fatal_valist(). */
762 module->levels[VLF_CONSOLE] = VLL_OFF;
764 vlog_valist(module, VLL_EMER, message, args);
765 ovs_fatal_valist(0, message, args);
768 /* Logs 'message' to 'module' at maximum verbosity, then exits with a failure
769 * exit code. Always writes the message to stderr, even if the console
770 * facility is disabled.
772 * Choose this function instead of vlog_abort() if the daemon monitoring
773 * facility shouldn't automatically restart the current daemon. */
775 vlog_fatal(const struct vlog_module *module, const char *message, ...)
779 va_start(args, message);
780 vlog_fatal_valist(module, message, args);
784 /* Logs 'message' to 'module' at maximum verbosity, then calls abort(). Always
785 * writes the message to stderr, even if the console facility is disabled.
787 * Choose this function instead of vlog_fatal_valist() if the daemon monitoring
788 * facility should automatically restart the current daemon. */
790 vlog_abort_valist(const struct vlog_module *module_,
791 const char *message, va_list args)
793 struct vlog_module *module = (struct vlog_module *) module_;
795 /* Don't log this message to the console to avoid redundancy with the
796 * message written by the later ovs_abort_valist(). */
797 module->levels[VLF_CONSOLE] = VLL_OFF;
799 vlog_valist(module, VLL_EMER, message, args);
800 ovs_abort_valist(0, message, args);
803 /* Logs 'message' to 'module' at maximum verbosity, then calls abort(). Always
804 * writes the message to stderr, even if the console facility is disabled.
806 * Choose this function instead of vlog_fatal() if the daemon monitoring
807 * facility should automatically restart the current daemon. */
809 vlog_abort(const struct vlog_module *module, const char *message, ...)
813 va_start(args, message);
814 vlog_abort_valist(module, message, args);
819 vlog_should_drop(const struct vlog_module *module, enum vlog_level level,
820 struct vlog_rate_limit *rl)
822 if (!vlog_is_enabled(module, level)) {
826 if (!token_bucket_withdraw(&rl->token_bucket, VLOG_MSG_TOKENS)) {
827 time_t now = time_now();
828 if (!rl->n_dropped) {
829 rl->first_dropped = now;
831 rl->last_dropped = now;
837 time_t now = time_now();
838 unsigned int first_dropped_elapsed = now - rl->first_dropped;
839 unsigned int last_dropped_elapsed = now - rl->last_dropped;
842 "Dropped %u log messages in last %u seconds (most recently, "
843 "%u seconds ago) due to excessive rate",
844 rl->n_dropped, first_dropped_elapsed, last_dropped_elapsed);
852 vlog_rate_limit(const struct vlog_module *module, enum vlog_level level,
853 struct vlog_rate_limit *rl, const char *message, ...)
855 if (!vlog_should_drop(module, level, rl)) {
858 va_start(args, message);
859 vlog_valist(module, level, message, args);
867 printf("\nLogging options:\n"
868 " -v, --verbose=[SPEC] set logging levels\n"
869 " -v, --verbose set maximum verbosity level\n"
870 " --log-file[=FILE] enable logging to specified FILE\n"
871 " (default: %s/%s.log)\n",
872 ovs_logdir(), program_name);