2 This file is part of GNUnet.
3 (C) 2006, 2008, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file util/common_logging.c
23 * @brief error handling API
25 * @author Christian Grothoff
28 #include "gnunet_common.h"
29 #include "gnunet_crypto_lib.h"
30 #include "gnunet_strings_lib.h"
31 #include "gnunet_time_lib.h"
34 * After how many milliseconds do we always print
35 * that "message X was repeated N times"? Use 12h.
37 #define BULK_DELAY_THRESHOLD (12 * 60 * 60 * 1000)
40 * After how many repetitions do we always print
41 * that "message X was repeated N times"? (even if
42 * we have not yet reached the delay threshold)
44 #define BULK_REPEAT_THRESHOLD 1000
47 * How many characters do we use for matching of
50 #define BULK_TRACK_SIZE 256
53 * How many characters do we use for matching of
56 #define COMP_TRACK_SIZE 32
59 * How many characters can a date/time string
62 #define DATE_STR_SIZE 64
65 * Linked list of active loggers.
70 * This is a linked list.
72 struct CustomLogger *next;
86 * The last "bulk" error message that we have been logging.
87 * Note that this message maybe truncated to the first BULK_TRACK_SIZE
88 * characters, in which case it is NOT 0-terminated!
90 static char last_bulk[BULK_TRACK_SIZE];
93 * Type of the last bulk message.
95 static enum GNUNET_ErrorType last_bulk_kind;
98 * Time of the last bulk error message (0 for none)
100 static struct GNUNET_TIME_Absolute last_bulk_time;
103 * Number of times that bulk message has been repeated since.
105 static unsigned int last_bulk_repeat;
108 * Component when the last bulk was logged. Will be 0-terminated.
110 static char last_bulk_comp[COMP_TRACK_SIZE + 1];
115 static char *component;
118 * Running component (without pid).
120 static char *component_nopid;
125 static enum GNUNET_ErrorType min_level;
128 * Linked list of our custom loggres.
130 static struct CustomLogger *loggers;
133 * Number of log calls to ignore.
135 unsigned int skip_log;
138 * File descriptor to use for "stderr", or NULL for none.
140 static FILE *GNUNET_stderr;
143 * Represents a single logging definition
148 * Component name. NULL means that this definition matches any component
153 * File name. NULL means that this definition matches any file
158 * Stores strlen(file)
163 * Function name. NULL means that this definition matches any function
168 * Lowest line at which this definition matches.
169 * Defaults to 0. Must be <= to_line.
174 * Highest line at which this definition matches.
175 * Defaults to INT_MAX. Must be >= from_line.
180 * Maximal log level allowed for calls that match this definition.
181 * Calls with higher log level will be disabled.
187 * 1 if this definition comes from GNUNET_FORCE_LOG, which means that it
188 * overrides any configuration options. 0 otherwise.
194 * Dynamic array of logging definitions
196 struct LogDef *logdefs = NULL;
199 * Allocated size of logdefs array (in units)
201 int logdefs_size = 0;
204 * The number of units used in logdefs array.
209 * GNUNET_YES if GNUNET_LOG environment variable is already parsed.
211 int gnunet_log_parsed = GNUNET_NO;
214 * GNUNET_YES if GNUNET_FORCE_LOG environment variable is already parsed.
216 int gnunet_force_log_parsed = GNUNET_NO;
219 * GNUNET_YES if at least one definition with forced == 1 is available.
221 int gnunet_force_log_present = GNUNET_NO;
225 * Contains the number of performance counts per second.
227 LARGE_INTEGER performance_frequency;
231 * Convert a textual description of a loglevel
232 * to the respective GNUNET_GE_KIND.
234 * @param log loglevel to parse
235 * @return GNUNET_GE_INVALID if log does not parse
237 static enum GNUNET_ErrorType
238 get_type (const char *log)
241 return GNUNET_ERROR_TYPE_UNSPECIFIED;
242 if (0 == strcasecmp (log, _("DEBUG")))
243 return GNUNET_ERROR_TYPE_DEBUG;
244 if (0 == strcasecmp (log, _("INFO")))
245 return GNUNET_ERROR_TYPE_INFO;
246 if (0 == strcasecmp (log, _("WARNING")))
247 return GNUNET_ERROR_TYPE_WARNING;
248 if (0 == strcasecmp (log, _("ERROR")))
249 return GNUNET_ERROR_TYPE_ERROR;
250 if (0 == strcasecmp (log, _("NONE")))
251 return GNUNET_ERROR_TYPE_NONE;
252 return GNUNET_ERROR_TYPE_INVALID;
254 #if !defined(GNUNET_CULL_LOGGING)
256 * Utility function - reallocates logdefs array to be twice as large.
261 logdefs_size = (logdefs_size + 1) * 2;
262 logdefs = GNUNET_realloc (logdefs, logdefs_size * sizeof (struct LogDef));
266 * Utility function - adds a parsed definition to logdefs array.
268 * @param component see struct LogDef, can't be NULL
269 * @param file see struct LogDef, can't be NULL
270 * @param function see struct LogDef, can't be NULL
271 * @param from_line see struct LogDef
272 * @param to_line see struct LogDef
273 * @param level see struct LogDef, must be >= 0
274 * @param force see struct LogDef
277 add_definition (char *component, char *file, char *function, int from_line, int to_line, int level, int force)
279 if (logdefs_size == logdefs_len)
282 memset (&n, 0, sizeof (n));
283 if (strlen (component) > 0 && component[0] != '*')
284 n.component = strdup (component);
285 if (strlen (file) > 0 && file[0] != '*')
287 n.file = strdup (file);
288 n.strlen_file = strlen (file);
290 if (strlen (function) > 0 && function[0] != '*')
291 n.function = strdup (function);
292 n.from_line = from_line;
296 logdefs[logdefs_len++] = n;
301 * Decides whether a particular logging call should or should not be allowed
302 * to be made. Used internally by GNUNET_log*()
304 * @param caller_level loglevel the caller wants to use
305 * @param comp component name the caller uses (NULL means that global
306 * component name is used)
307 * @param file file name containing the logging call, usually __FILE__
308 * @param function function which tries to make a logging call,
309 * usually __FUNCTION__
310 * @param line line at which the call is made, usually __LINE__
311 * @return 0 to disallow the call, 1 to allow it
314 GNUNET_get_log_call_status (int caller_level, const char *comp, const char *file, const char *function, int line)
323 /* Use default component */
324 comp = component_nopid;
326 /* We have no definitions to override globally configured log level,
327 * so just use it right away.
329 if (min_level >= 0 && gnunet_force_log_present == GNUNET_NO)
330 return caller_level <= min_level;
332 /* Only look for forced definitions? */
333 force_only = min_level >= 0;
334 strlen_file = strlen (file);
335 for (i = 0; i < logdefs_len; i++)
338 if ((!force_only || ld->force) &&
339 (line >= ld->from_line && line <= ld->to_line) &&
340 (ld->component == NULL || strcmp (comp, ld->component) == 0) &&
342 (ld->strlen_file <= strlen_file &&
343 strcmp (&file[strlen_file - ld->strlen_file], ld->file) == 0)) &&
344 (ld->function == NULL || strcmp (function, ld->function) == 0)
347 /* This definition matched! */
349 /* And if it allows the call to be made, then we're finished */
350 if (caller_level <= ld->level)
354 /* If some definitions did match, but had too low loglevel to allow logging,
355 * don't check any further.
359 /* Otherwise use global level, if defined */
361 return caller_level <= min_level;
362 /* All programs/services previously defaulted to WARNING.
363 * Now WE default to WARNING, and THEY default to NULL.
365 return caller_level <= GNUNET_ERROR_TYPE_WARNING;
370 * Utility function - parses a definition
373 * component;file;function;from_line-to_line;level[/component...]
374 * All entries are mandatory, but may be empty.
375 * Empty entries for component, file and function are treated as
376 * "matches anything".
377 * Empty line entry is treated as "from 0 to INT_MAX"
378 * Line entry with only one line is treated as "this line only"
379 * Entry for level MUST NOT be empty.
380 * Entries for component, file and function that consist of a
381 * single character "*" are treated (at the moment) the same way
382 * empty entries are treated (wildcard matching is not implemented (yet?)).
383 * file entry is matched to the end of __FILE__. That is, it might be
384 * a base name, or a base name with leading directory names (some compilers
385 * define __FILE__ to absolute file path).
387 * @param constname name of the environment variable from which to get the
388 * string to be parsed
389 * @param force 1 if definitions found in @constname are to be forced
390 * @return number of added definitions
393 parse_definitions (const char *constname, int force)
399 char *function = NULL;
405 int from_line, to_line;
407 int keep_looking = 1;
408 tmp = getenv (constname);
415 for (p = def, state = 0, start = def; keep_looking; p++)
419 case ';': /* found a field separator */
423 case 0: /* within a component name */
426 case 1: /* within a file name */
429 case 2: /* within a function name */
430 /* after a file name there must be a function name */
433 case 3: /* within a from-to line range */
434 if (strlen (start) > 0)
437 from_line = strtol (start, &t, 10);
438 if (errno != 0 || from_line < 0)
443 if (t < p && t[0] == '-')
447 to_line = strtol (start, &t, 10);
448 if (errno != 0 || to_line < 0 || t != p)
454 else /* one number means "match this line only" */
457 else /* default to 0-max */
467 case '\0': /* found EOL */
469 /* fall through to '/' */
470 case '/': /* found a definition separator */
473 case 4: /* within a log level */
476 level = get_type ((const char *) start);
477 if (level == GNUNET_ERROR_TYPE_INVALID || level == GNUNET_ERROR_TYPE_UNSPECIFIED)
482 add_definition (comp, file, function, from_line, to_line, level, force);
498 * Utility function - parses GNUNET_LOG and GNUNET_FORCE_LOG.
501 parse_all_definitions ()
503 if (gnunet_log_parsed == GNUNET_NO)
504 parse_definitions ("GNUNET_LOG", 0);
505 gnunet_log_parsed = GNUNET_YES;
506 if (gnunet_force_log_parsed == GNUNET_NO)
507 gnunet_force_log_present = parse_definitions ("GNUNET_FORCE_LOG", 1) > 0 ? GNUNET_YES : GNUNET_NO;
508 gnunet_force_log_parsed = GNUNET_YES;
514 * @param comp default component to use
515 * @param loglevel what types of messages should be logged
516 * @param logfile which file to write log messages to (can be NULL)
517 * @return GNUNET_OK on success
520 GNUNET_log_setup (const char *comp, const char *loglevel, const char *logfile)
525 const char *env_logfile = NULL;
527 min_level = get_type (loglevel);
528 #if !defined(GNUNET_CULL_LOGGING)
529 parse_all_definitions ();
532 QueryPerformanceFrequency (&performance_frequency);
534 GNUNET_free_non_null (component);
535 GNUNET_asprintf (&component, "%s-%d", comp, getpid ());
536 GNUNET_free_non_null (component_nopid);
537 component_nopid = strdup (comp);
539 env_logfile = getenv ("GNUNET_FORCE_LOGFILE");
540 if (env_logfile != NULL)
541 logfile = env_logfile;
545 fn = GNUNET_STRINGS_filename_expand (logfile);
547 return GNUNET_SYSERR;
548 dirwarn = (GNUNET_OK != GNUNET_DISK_directory_create_for_file (fn));
549 altlog = FOPEN (fn, "a");
552 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "fopen", fn);
554 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
555 _("Failed to create or access directory for log file `%s'\n"),
558 return GNUNET_SYSERR;
561 if (GNUNET_stderr != NULL)
562 fclose (GNUNET_stderr);
563 GNUNET_stderr = altlog;
568 * Add a custom logger.
570 * @param logger log function
571 * @param logger_cls closure for logger
574 GNUNET_logger_add (GNUNET_Logger logger, void *logger_cls)
576 struct CustomLogger *entry;
578 entry = GNUNET_malloc (sizeof (struct CustomLogger));
579 entry->logger = logger;
580 entry->logger_cls = logger_cls;
581 entry->next = loggers;
586 * Remove a custom logger.
588 * @param logger log function
589 * @param logger_cls closure for logger
592 GNUNET_logger_remove (GNUNET_Logger logger, void *logger_cls)
594 struct CustomLogger *pos;
595 struct CustomLogger *prev;
599 while ((pos != NULL) &&
600 ((pos->logger != logger) || (pos->logger_cls != logger_cls)))
605 GNUNET_assert (pos != NULL);
609 prev->next = pos->next;
615 * Actually output the log message.
617 * @param kind how severe was the issue
618 * @param comp component responsible
619 * @param datestr current date/time
620 * @param msg the actual message
623 output_message (enum GNUNET_ErrorType kind, const char *comp,
624 const char *datestr, const char *msg)
626 struct CustomLogger *pos;
628 if (GNUNET_stderr != NULL)
630 fprintf (GNUNET_stderr, "%s %s %s %s", datestr, comp,
631 GNUNET_error_type_to_string (kind), msg);
632 fflush (GNUNET_stderr);
637 pos->logger (pos->logger_cls, kind, comp, datestr, msg);
644 * Flush an existing bulk report to the output.
646 * @param datestr our current timestamp
649 flush_bulk (const char *datestr)
651 char msg[DATE_STR_SIZE + BULK_TRACK_SIZE + 256];
656 if ((last_bulk_time.abs_value == 0) || (last_bulk_repeat == 0))
659 last = memchr (last_bulk, '\0', BULK_TRACK_SIZE);
661 last = &last_bulk[BULK_TRACK_SIZE - 1];
662 else if (last != last_bulk)
669 ft = GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration
671 snprintf (msg, sizeof (msg),
672 _("Message `%.*s' repeated %u times in the last %s\n"),
673 BULK_TRACK_SIZE, last_bulk, last_bulk_repeat, ft);
677 output_message (last_bulk_kind, last_bulk_comp, datestr, msg);
678 last_bulk_time = GNUNET_TIME_absolute_get ();
679 last_bulk_repeat = 0;
684 * Ignore the next n calls to the log function.
686 * @param n number of log calls to ignore
687 * @param check_reset GNUNET_YES to assert that the log skip counter is currently zero
690 GNUNET_log_skip (unsigned int n, int check_reset)
696 ok = (0 == skip_log);
707 * Output a log message using the default mechanism.
709 * @param kind how severe was the issue
710 * @param comp component responsible
711 * @param message the actual message
712 * @param va arguments to the format string "message"
715 mylog (enum GNUNET_ErrorType kind, const char *comp, const char *message,
718 char date[DATE_STR_SIZE];
719 char date2[DATE_STR_SIZE];
721 struct timeval timeofday;
728 size = VSNPRINTF (NULL, 0, message, vacp) + 1;
733 VSNPRINTF (buf, size, message, va);
735 memset (date, 0, DATE_STR_SIZE);
736 tmptr = localtime (&timetmp);
737 gettimeofday (&timeofday, NULL);
744 QueryPerformanceCounter (&pc);
745 strftime (date2, DATE_STR_SIZE, "%b %d %H:%M:%S-%%020llu", tmptr);
746 snprintf (date, sizeof (date), date2,
747 (long long) (pc.QuadPart /
748 (performance_frequency.QuadPart / 1000)));
750 strftime (date2, DATE_STR_SIZE, "%b %d %H:%M:%S-%%06u", tmptr);
751 snprintf (date, sizeof (date), date2, timeofday.tv_usec);
755 strcpy (date, "localtime error");
756 if ((0 != (kind & GNUNET_ERROR_TYPE_BULK)) && (last_bulk_time.abs_value != 0)
757 && (0 == strncmp (buf, last_bulk, sizeof (last_bulk))))
760 if ((GNUNET_TIME_absolute_get_duration (last_bulk_time).rel_value >
761 BULK_DELAY_THRESHOLD) || (last_bulk_repeat > BULK_REPEAT_THRESHOLD))
767 strncpy (last_bulk, buf, sizeof (last_bulk));
768 last_bulk_repeat = 0;
769 last_bulk_kind = kind;
770 last_bulk_time = GNUNET_TIME_absolute_get ();
771 strncpy (last_bulk_comp, comp, COMP_TRACK_SIZE);
772 output_message (kind, comp, date, buf);
780 * @param kind how serious is the error?
781 * @param message what is the message (format string)
782 * @param ... arguments for format string
785 GNUNET_log_nocheck (enum GNUNET_ErrorType kind, const char *message, ...)
789 va_start (va, message);
790 mylog (kind, component, message, va);
796 * Log function that specifies an alternative component.
797 * This function should be used by plugins.
799 * @param kind how serious is the error?
800 * @param comp component responsible for generating the message
801 * @param message what is the message (format string)
802 * @param ... arguments for format string
805 GNUNET_log_from_nocheck (enum GNUNET_ErrorType kind, const char *comp,
806 const char *message, ...)
809 char comp_w_pid[128];
812 comp = component_nopid;
814 va_start (va, message);
815 GNUNET_snprintf (comp_w_pid, sizeof (comp_w_pid), "%s-%d", comp, getpid ());
816 mylog (kind, comp_w_pid, message, va);
822 * Convert error type to string.
824 * @param kind type to convert
825 * @return string corresponding to the type
828 GNUNET_error_type_to_string (enum GNUNET_ErrorType kind)
830 if ((kind & GNUNET_ERROR_TYPE_ERROR) > 0)
832 if ((kind & GNUNET_ERROR_TYPE_WARNING) > 0)
834 if ((kind & GNUNET_ERROR_TYPE_INFO) > 0)
836 if ((kind & GNUNET_ERROR_TYPE_DEBUG) > 0)
838 if ((kind & ~GNUNET_ERROR_TYPE_BULK) == 0)
845 * Convert a hash to a string (for printing debug messages).
846 * This is one of the very few calls in the entire API that is
849 * @param hc the hash code
850 * @return string form; will be overwritten by next call to GNUNET_h2s.
853 GNUNET_h2s (const GNUNET_HashCode * hc)
855 static struct GNUNET_CRYPTO_HashAsciiEncoded ret;
857 GNUNET_CRYPTO_hash_to_enc (hc, &ret);
858 ret.encoding[8] = '\0';
859 return (const char *) ret.encoding;
863 * Convert a hash to a string (for printing debug messages).
864 * This is one of the very few calls in the entire API that is
867 * @param hc the hash code
868 * @return string form; will be overwritten by next call to GNUNET_h2s_full.
871 GNUNET_h2s_full (const GNUNET_HashCode * hc)
873 static struct GNUNET_CRYPTO_HashAsciiEncoded ret;
875 GNUNET_CRYPTO_hash_to_enc (hc, &ret);
876 ret.encoding[sizeof (ret) - 1] = '\0';
877 return (const char *) ret.encoding;
881 * Convert a peer identity to a string (for printing debug messages).
882 * This is one of the very few calls in the entire API that is
885 * @param pid the peer identity
886 * @return string form of the pid; will be overwritten by next
887 * call to GNUNET_i2s.
890 GNUNET_i2s (const struct GNUNET_PeerIdentity *pid)
892 static struct GNUNET_CRYPTO_HashAsciiEncoded ret;
894 GNUNET_CRYPTO_hash_to_enc (&pid->hashPubKey, &ret);
895 ret.encoding[4] = '\0';
896 return (const char *) ret.encoding;
902 * Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string
903 * (for printing debug messages). This is one of the very few calls
904 * in the entire API that is NOT reentrant!
906 * @param addr the address
907 * @param addrlen the length of the address
908 * @return nicely formatted string for the address
909 * will be overwritten by next call to GNUNET_a2s.
912 GNUNET_a2s (const struct sockaddr *addr, socklen_t addrlen)
914 static char buf[INET6_ADDRSTRLEN + 8];
916 const struct sockaddr_in *v4;
917 const struct sockaddr_un *un;
918 const struct sockaddr_in6 *v6;
922 return _("unknown address");
923 switch (addr->sa_family)
926 if (addrlen != sizeof (struct sockaddr_in))
927 return "<invalid v4 address>";
928 v4 = (const struct sockaddr_in *) addr;
929 inet_ntop (AF_INET, &v4->sin_addr, buf, INET_ADDRSTRLEN);
930 if (0 == ntohs (v4->sin_port))
933 GNUNET_snprintf (b2, sizeof (b2), "%u", ntohs (v4->sin_port));
937 if (addrlen != sizeof (struct sockaddr_in6))
938 return "<invalid v4 address>";
939 v6 = (const struct sockaddr_in6 *) addr;
941 inet_ntop (AF_INET6, &v6->sin6_addr, &buf[1], INET6_ADDRSTRLEN);
942 if (0 == ntohs (v6->sin6_port))
945 GNUNET_snprintf (b2, sizeof (b2), "%u", ntohs (v6->sin6_port));
949 if (addrlen <= sizeof (sa_family_t))
950 return "<unbound UNIX client>";
951 un = (const struct sockaddr_un *) addr;
953 if (un->sun_path[0] == '\0')
955 snprintf (buf, sizeof (buf), "%s%.*s", (off == 1) ? "@" : "",
956 (int) (addrlen - sizeof (sa_family_t) - 1 - off),
960 return _("invalid address");
968 void __attribute__ ((constructor)) GNUNET_util_cl_init ()
970 GNUNET_stderr = stderr;
980 void __attribute__ ((destructor)) GNUNET_util_cl_fini ()
987 /* end of common_logging.c */