2 Unix SMB/CIFS implementation.
3 Samba utility functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Elrond 2002
6 Copyright (C) Simo Sorce 2002
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "system/filesys.h"
24 #include "system/syslog.h"
25 #include "lib/util/time.h"
27 /* define what facility to use for syslog */
28 #ifndef SYSLOG_FACILITY
29 #define SYSLOG_FACILITY LOG_DAEMON
32 /* -------------------------------------------------------------------------- **
35 * FORMAT_BUFR_MAX - Index of the last byte of the format buffer;
36 * format_bufr[FORMAT_BUFR_MAX] should always be reserved
37 * for a terminating null byte.
40 #define FORMAT_BUFR_SIZE 1024
41 #define FORMAT_BUFR_MAX (FORMAT_BUFR_SIZE - 1)
43 /* -------------------------------------------------------------------------- **
44 * This module implements Samba's debugging utility.
46 * The syntax of a debugging log file is represented as:
48 * <debugfile> :== { <debugmsg> }
50 * <debugmsg> :== <debughdr> '\n' <debugtext>
52 * <debughdr> :== '[' TIME ',' LEVEL ']' [ [FILENAME ':'] [FUNCTION '()'] ]
54 * <debugtext> :== { <debugline> }
56 * <debugline> :== TEXT '\n'
58 * TEXT is a string of characters excluding the newline character.
59 * LEVEL is the DEBUG level of the message (an integer in the range 0..10).
60 * TIME is a timestamp.
61 * FILENAME is the name of the file from which the debug message was generated.
62 * FUNCTION is the function from which the debug message was generated.
64 * Basically, what that all means is:
66 * - A debugging log file is made up of debug messages.
68 * - Each debug message is made up of a header and text. The header is
69 * separated from the text by a newline.
71 * - The header begins with the timestamp and debug level of the message
72 * enclosed in brackets. The filename and function from which the
73 * message was generated may follow. The filename is terminated by a
74 * colon, and the function name is terminated by parenthesis.
76 * - The message text is made up of zero or more lines, each terminated by
80 /* state variables for the debug system */
83 int fd; /* The log file handle */
84 enum debug_logtype logtype; /* The type of logging we are doing: eg stdout, file, stderr */
85 const char *prog_name;
87 bool schedule_reopen_logs;
89 struct debug_settings settings;
93 .timestamp_logs = true
97 /* -------------------------------------------------------------------------- **
100 * debugf - Debug file name.
101 * DEBUGLEVEL - System-wide debug message limit. Messages with message-
102 * levels higher than DEBUGLEVEL will not be processed.
106 used to check if the user specified a
107 logfile on the command line
109 bool override_logfile;
112 * This is to allow reading of DEBUGLEVEL_CLASS before the debug
113 * system has been initialized.
115 static const int debug_class_list_initial[DBGC_MAX_FIXED + 1];
117 static int debug_num_classes = 0;
118 int *DEBUGLEVEL_CLASS = discard_const_p(int, debug_class_list_initial);
121 /* -------------------------------------------------------------------------- **
122 * Internal variables.
124 * debug_count - Number of debug messages that have been output.
125 * Used to check log size.
127 * syslog_level - Internal copy of the message debug level. Written by
128 * dbghdr() and read by Debug1().
130 * format_bufr - Used to format debug messages. The dbgtext() function
131 * prints debug messages to a string, and then passes the
132 * string to format_debug_text(), which uses format_bufr
133 * to build the formatted output.
135 * format_pos - Marks the first free byte of the format_bufr.
138 * log_overflow - When this variable is true, never attempt to check the
139 * size of the log. This is a hack, so that we can write
140 * a message using DEBUG, from open_logs() when we
141 * are unable to open a new log file for some reason.
144 static int debug_count = 0;
146 static int syslog_level = 0;
148 static char *format_bufr = NULL;
149 static size_t format_pos = 0;
150 static bool log_overflow = false;
153 * Define all the debug class selection names here. Names *MUST NOT* contain
154 * white space. There must be one name for each DBGC_<class name>, and they
155 * must be in the table in the order of DBGC_<class name>..
157 static const char *default_classname_table[] = {
158 "all", /* DBGC_ALL; index refs traditional DEBUGLEVEL */
159 "tdb", /* DBGC_TDB */
160 "printdrivers", /* DBGC_PRINTDRIVERS */
161 "lanman", /* DBGC_LANMAN */
162 "smb", /* DBGC_SMB */
163 "rpc_parse", /* DBGC_RPC_PARSE */
164 "rpc_srv", /* DBGC_RPC_SRV */
165 "rpc_cli", /* DBGC_RPC_CLI */
166 "passdb", /* DBGC_PASSDB */
167 "sam", /* DBGC_SAM */
168 "auth", /* DBGC_AUTH */
169 "winbind", /* DBGC_WINBIND */
170 "vfs", /* DBGC_VFS */
171 "idmap", /* DBGC_IDMAP */
172 "quota", /* DBGC_QUOTA */
173 "acls", /* DBGC_ACLS */
174 "locking", /* DBGC_LOCKING */
175 "msdfs", /* DBGC_MSDFS */
176 "dmapi", /* DBGC_DMAPI */
177 "registry", /* DBGC_REGISTRY */
181 static char **classname_table = NULL;
184 /* -------------------------------------------------------------------------- **
188 static void debug_init(void);
190 /***************************************************************************
191 Free memory pointed to by global pointers.
192 ****************************************************************************/
194 void gfree_debugsyms(void)
196 TALLOC_FREE(classname_table);
198 if ( DEBUGLEVEL_CLASS != debug_class_list_initial ) {
199 TALLOC_FREE( DEBUGLEVEL_CLASS );
200 DEBUGLEVEL_CLASS = discard_const_p(int, debug_class_list_initial);
203 TALLOC_FREE(format_bufr);
205 debug_num_classes = DBGC_MAX_FIXED;
207 state.initialized = false;
210 /****************************************************************************
211 utility lists registered debug class names's
212 ****************************************************************************/
214 char *debug_list_class_names_and_levels(void)
218 /* prepare strings */
219 for (i = 0; i < debug_num_classes; i++) {
220 buf = talloc_asprintf_append(buf,
224 i == (debug_num_classes - 1) ? "\n" : " ");
232 /****************************************************************************
233 Utility to translate names to debug class index's (internal version).
234 ****************************************************************************/
236 static int debug_lookup_classname_int(const char* classname)
240 if (!classname) return -1;
242 for (i=0; i < debug_num_classes; i++) {
243 if (strcmp(classname, classname_table[i])==0)
249 /****************************************************************************
250 Add a new debug class to the system.
251 ****************************************************************************/
253 int debug_add_class(const char *classname)
257 char **new_name_list;
262 /* check the init has yet been called */
265 ndx = debug_lookup_classname_int(classname);
268 ndx = debug_num_classes;
270 if (DEBUGLEVEL_CLASS == debug_class_list_initial) {
271 /* Initial loading... */
272 new_class_list = NULL;
274 new_class_list = DEBUGLEVEL_CLASS;
277 new_class_list = talloc_realloc(NULL, new_class_list, int, ndx + 1);
280 DEBUGLEVEL_CLASS = new_class_list;
282 DEBUGLEVEL_CLASS[ndx] = DEBUGLEVEL_CLASS[DBGC_ALL];
284 new_name_list = talloc_realloc(NULL, classname_table, char *, ndx + 1);
287 classname_table = new_name_list;
289 classname_table[ndx] = talloc_strdup(classname_table, classname);
290 if (! classname_table[ndx])
293 debug_num_classes = ndx + 1;
298 /****************************************************************************
299 Utility to translate names to debug class index's (public version).
300 ****************************************************************************/
302 int debug_lookup_classname(const char *classname)
306 if (!classname || !*classname)
309 ndx = debug_lookup_classname_int(classname);
314 DEBUG(0, ("debug_lookup_classname(%s): Unknown class\n",
316 return debug_add_class(classname);
319 /****************************************************************************
320 Dump the current registered debug levels.
321 ****************************************************************************/
323 static void debug_dump_status(int level)
327 DEBUG(level, ("INFO: Current debug levels:\n"));
328 for (q = 0; q < debug_num_classes; q++) {
329 const char *classname = classname_table[q];
330 DEBUGADD(level, (" %s: %d\n",
332 DEBUGLEVEL_CLASS[q]));
336 /****************************************************************************
337 parse the debug levels from smbcontrol. Example debug level parameter:
339 ****************************************************************************/
341 static bool debug_parse_params(char **params)
350 /* Allow DBGC_ALL to be specified w/o requiring its class name e.g."10"
351 * v.s. "all:10", this is the traditional way to set DEBUGLEVEL
353 if (isdigit((int)params[0][0])) {
354 DEBUGLEVEL_CLASS[DBGC_ALL] = atoi(params[0]);
355 i = 1; /* start processing at the next params */
357 DEBUGLEVEL_CLASS[DBGC_ALL] = 0;
358 i = 0; /* DBGC_ALL not specified OR class name was included */
361 /* Array is debug_num_classes long */
362 for (ndx = DBGC_ALL; ndx < debug_num_classes; ndx++) {
363 DEBUGLEVEL_CLASS[ndx] = DEBUGLEVEL_CLASS[DBGC_ALL];
366 /* Fill in new debug class levels */
367 for (; i < debug_num_classes && params[i]; i++) {
369 if ((class_name = strtok_r(params[i],":", &saveptr)) &&
370 (class_level = strtok_r(NULL, "\0", &saveptr)) &&
371 ((ndx = debug_lookup_classname(class_name)) != -1)) {
372 DEBUGLEVEL_CLASS[ndx] = atoi(class_level);
374 DEBUG(0,("debug_parse_params: unrecognized debug class name or format [%s]\n", params[i]));
382 /****************************************************************************
383 Parse the debug levels from smb.conf. Example debug level string:
384 3 tdb:5 printdrivers:7
385 Note: the 1st param has no "name:" preceeding it.
386 ****************************************************************************/
388 bool debug_parse_levels(const char *params_str)
395 params = str_list_make(NULL, params_str, NULL);
397 if (debug_parse_params(params)) {
398 debug_dump_status(5);
407 /* setup for logging of talloc warnings */
408 static void talloc_log_fn(const char *msg)
410 DEBUG(0,("%s", msg));
413 void debug_setup_talloc_log(void)
415 talloc_set_log_fn(talloc_log_fn);
419 /****************************************************************************
420 Init debugging (one time stuff)
421 ****************************************************************************/
423 static void debug_init(void)
427 if (state.initialized)
430 state.initialized = true;
432 debug_setup_talloc_log();
434 for(p = default_classname_table; *p; p++) {
437 format_bufr = talloc_array(NULL, char, FORMAT_BUFR_SIZE);
439 smb_panic("debug_init: unable to create buffer");
443 /* This forces in some smb.conf derived values into the debug system.
444 * There are no pointers in this structure, so we can just
445 * structure-assign it in */
446 void debug_set_settings(struct debug_settings *settings)
448 state.settings = *settings;
452 control the name of the logfile and whether logging will be to stdout, stderr
453 or a file, and set up syslog
455 new_log indicates the destination for the debug log (an enum in
456 order of precedence - once set to DEBUG_FILE, it is not possible to
457 reset to DEBUG_STDOUT for example. This makes it easy to override
458 for debug to stderr on the command line, as the smb.conf cannot
459 reset it back to file-based logging
461 void setup_logging(const char *prog_name, enum debug_logtype new_logtype)
464 if (state.logtype < new_logtype) {
465 state.logtype = new_logtype;
468 state.prog_name = prog_name;
470 reopen_logs_internal();
472 if (state.logtype == DEBUG_FILE) {
474 const char *p = strrchr_m( prog_name,'/' );
478 openlog( prog_name, LOG_PID, SYSLOG_FACILITY );
480 /* for old systems that have no facility codes. */
481 openlog( prog_name, LOG_PID );
487 /***************************************************************************
488 Set the logfile name.
489 **************************************************************************/
491 void debug_set_logfile(const char *name)
493 TALLOC_FREE(state.debugf);
494 state.debugf = talloc_strdup(NULL, name);
497 static void debug_close_fd(int fd)
504 bool debug_get_output_is_stderr(void)
506 return (state.logtype == DEBUG_DEFAULT_STDERR) || (state.logtype == DEBUG_STDERR);
509 /**************************************************************************
511 note that we now do this unconditionally
512 We attempt to open the new debug fp before closing the old. This means
513 if we run out of fd's we just keep using the old fd rather than aborting.
514 Fix from dgibson@linuxcare.com.
515 **************************************************************************/
518 reopen the log file (usually called because the log file name might have changed)
520 bool reopen_logs_internal(void)
528 if (state.reopening_logs) {
532 /* Now clear the SIGHUP induced flag */
533 state.schedule_reopen_logs = false;
535 switch (state.logtype) {
537 debug_close_fd(state.fd);
541 case DEBUG_DEFAULT_STDERR:
543 debug_close_fd(state.fd);
551 oldumask = umask( 022 );
553 fname = state.debugf;
558 state.reopening_logs = true;
560 new_fd = open( state.debugf, O_WRONLY|O_APPEND|O_CREAT, 0644);
564 DEBUG(0, ("Unable to open new log file %s: %s\n", state.debugf, strerror(errno)));
565 log_overflow = false;
570 debug_close_fd(old_fd);
573 /* Fix from klausr@ITAP.Physik.Uni-Stuttgart.De
574 * to fix problem where smbd's that generate less
575 * than 100 messages keep growing the log.
577 force_check_log_size();
578 (void)umask(oldumask);
580 /* Take over stderr to catch output into logs */
581 if (state.fd > 0 && dup2(state.fd, 2) == -1) {
582 close_low_fds(true); /* Close stderr too, if dup2 can't point it
586 state.reopening_logs = false;
591 /**************************************************************************
592 Force a check of the log size.
593 ***************************************************************************/
595 void force_check_log_size( void )
600 _PUBLIC_ void debug_schedule_reopen_logs(void)
602 state.schedule_reopen_logs = true;
606 /***************************************************************************
607 Check to see if there is any need to check if the logfile has grown too big.
608 **************************************************************************/
610 bool need_to_check_log_size( void )
614 if( debug_count < 100)
617 maxlog = state.settings.max_log_size * 1024;
618 if ( state.fd <=2 || maxlog <= 0 ) {
625 /**************************************************************************
626 Check to see if the log has grown to be too big.
627 **************************************************************************/
629 void check_log_size( void )
635 * We need to be root to check/change log-file, skip this and let the main
636 * loop check do a new check as root.
639 if( geteuid() != 0) {
640 /* We don't check sec_initial_uid() here as it isn't
641 * available in common code and we don't generally
642 * want to rotate and the possibly lose logs in
643 * make test or the build farm */
647 if(log_overflow || (!state.schedule_reopen_logs && !need_to_check_log_size())) {
651 maxlog = state.settings.max_log_size * 1024;
653 if (state.schedule_reopen_logs ||
654 (fstat(state.fd, &st) == 0
655 && st.st_size > maxlog )) {
656 (void)reopen_logs_internal();
657 if (state.fd > 0 && fstat(state.fd, &st) == 0) {
658 if (st.st_size > maxlog) {
661 if (asprintf(&name, "%s.old", state.debugf ) < 0) {
664 (void)rename(state.debugf, name);
666 if (!reopen_logs_internal()) {
667 /* We failed to reopen a log - continue using the old name. */
668 (void)rename(name, state.debugf);
676 * Here's where we need to panic if state.fd == 0 or -1 (invalid values)
680 /* This code should only be reached in very strange
681 * circumstances. If we merely fail to open the new log we
682 * should stick with the old one. ergo this should only be
683 * reached when opening the logs for the first time: at
684 * startup or when the log level is increased from zero.
687 int fd = open( "/dev/console", O_WRONLY, 0);
690 DEBUG(0,("check_log_size: open of debug file %s failed - using console.\n",
694 * We cannot continue without a debug file handle.
702 /*************************************************************************
703 Write an debug message on the debugfile.
704 This is called by dbghdr() and format_debug_text().
705 ************************************************************************/
707 int Debug1( const char *format_str, ... )
710 int old_errno = errno;
714 if ( state.logtype != DEBUG_FILE ) {
715 va_start( ap, format_str );
717 (void)vdprintf( state.fd, format_str, ap );
724 if( !state.settings.syslog_only)
727 if( state.fd <= 0 ) {
728 mode_t oldumask = umask( 022 );
729 int fd = open( state.debugf, O_WRONLY|O_APPEND|O_CREAT, 0644 );
730 (void)umask( oldumask );
740 if( syslog_level < state.settings.syslog ) {
741 /* map debug levels to syslog() priorities
742 * note that not all DEBUG(0, ...) calls are
743 * necessarily errors */
744 static const int priority_map[4] = {
754 if( syslog_level >= ARRAY_SIZE(priority_map) || syslog_level < 0)
755 priority = LOG_DEBUG;
757 priority = priority_map[syslog_level];
760 * Specify the facility to interoperate with other syslog
761 * callers (vfs_full_audit for example).
763 priority |= SYSLOG_FACILITY;
765 va_start(ap, format_str);
766 ret = vasprintf(&msgbuf, format_str, ap);
770 syslog(priority, "%s", msgbuf);
779 if( !state.settings.syslog_only)
782 va_start( ap, format_str );
784 (void)vdprintf( state.fd, format_str, ap );
795 /**************************************************************************
796 Print the buffer content via Debug1(), then reset the buffer.
799 ****************************************************************************/
801 static void bufr_print( void )
803 format_bufr[format_pos] = '\0';
804 (void)Debug1( "%s", format_bufr );
808 /***************************************************************************
809 Format the debug message text.
811 Input: msg - Text to be added to the "current" debug message text.
815 Notes: The purpose of this is two-fold. First, each call to syslog()
816 (used by Debug1(), see above) generates a new line of syslog
817 output. This is fixed by storing the partial lines until the
818 newline character is encountered. Second, printing the debug
819 message lines when a newline is encountered allows us to add
820 spaces, thus indenting the body of the message and making it
822 **************************************************************************/
824 static void format_debug_text( const char *msg )
827 bool timestamp = (state.logtype == DEBUG_FILE && (state.settings.timestamp_logs));
833 for( i = 0; msg[i]; i++ ) {
834 /* Indent two spaces at each new line. */
835 if(timestamp && 0 == format_pos) {
836 format_bufr[0] = format_bufr[1] = ' ';
840 /* If there's room, copy the character to the format buffer. */
841 if( format_pos < FORMAT_BUFR_MAX )
842 format_bufr[format_pos++] = msg[i];
844 /* If a newline is encountered, print & restart. */
848 /* If the buffer is full dump it out, reset it, and put out a line
849 * continuation indicator.
851 if( format_pos >= FORMAT_BUFR_MAX ) {
853 (void)Debug1( " +>\n" );
857 /* Just to be safe... */
858 format_bufr[format_pos] = '\0';
861 /***************************************************************************
862 Flush debug output, including the format buffer content.
866 ***************************************************************************/
868 void dbgflush( void )
873 /***************************************************************************
874 Print a Debug Header.
876 Input: level - Debug level of the message (not the system-wide debug
878 cls - Debuglevel class of the calling module.
879 file - Pointer to a string containing the name of the file
880 from which this function was called, or an empty string
881 if the __FILE__ macro is not implemented.
882 func - Pointer to a string containing the name of the function
883 from which this function was called, or an empty string
884 if the __FUNCTION__ macro is not implemented.
885 line - line number of the call to dbghdr, assuming __LINE__
888 Output: Always true. This makes it easy to fudge a call to dbghdr()
889 in a macro, since the function can be called as part of a test.
890 Eg: ( (level <= DEBUGLEVEL) && (dbghdr(level,"",line)) )
892 Notes: This function takes care of setting syslog_level.
894 ****************************************************************************/
896 bool dbghdrclass(int level, int cls, const char *location, const char *func)
898 /* Ensure we don't lose any real errno value. */
899 int old_errno = errno;
902 /* This is a fudge. If there is stuff sitting in the format_bufr, then
903 * the *right* thing to do is to call
904 * format_debug_text( "\n" );
905 * to write the remainder, and then proceed with the new header.
906 * Unfortunately, there are several places in the code at which
907 * the DEBUG() macro is used to build partial lines. That in mind,
908 * we'll work under the assumption that an incomplete line indicates
909 * that a new header is *not* desired.
915 /* Set syslog_level. */
916 syslog_level = level;
919 /* Don't print a header if we're logging to stdout. */
920 if ( state.logtype != DEBUG_FILE ) {
924 /* Print the header if timestamps are turned on. If parameters are
925 * not yet loaded, then default to timestamps on.
927 if( state.settings.timestamp_logs || state.settings.debug_prefix_timestamp) {
928 char header_str[200];
930 header_str[0] = '\0';
932 if( state.settings.debug_pid)
933 slprintf(header_str,sizeof(header_str)-1,", pid=%u",(unsigned int)getpid());
935 if( state.settings.debug_uid) {
936 size_t hs_len = strlen(header_str);
937 slprintf(header_str + hs_len,
938 sizeof(header_str) - 1 - hs_len,
939 ", effective(%u, %u), real(%u, %u)",
940 (unsigned int)geteuid(), (unsigned int)getegid(),
941 (unsigned int)getuid(), (unsigned int)getgid());
944 if (state.settings.debug_class && (cls != DBGC_ALL)) {
945 size_t hs_len = strlen(header_str);
946 slprintf(header_str + hs_len,
947 sizeof(header_str) -1 - hs_len,
949 default_classname_table[cls]);
952 /* Print it all out at once to prevent split syslog output. */
953 if( state.settings.debug_prefix_timestamp ) {
954 char *time_str = current_timestring(NULL,
955 state.settings.debug_hires_timestamp);
956 (void)Debug1( "[%s, %2d%s] ",
959 talloc_free(time_str);
961 char *time_str = current_timestring(NULL,
962 state.settings.debug_hires_timestamp);
963 (void)Debug1( "[%s, %2d%s] %s(%s)\n",
965 level, header_str, location, func );
966 talloc_free(time_str);
974 /***************************************************************************
975 Add text to the body of the "current" debug message via the format buffer.
977 Input: format_str - Format string, as used in printf(), et. al.
978 ... - Variable argument list.
980 ..or.. va_alist - Old style variable parameter list starting point.
982 Output: Always true. See dbghdr() for more info, though this is not
983 likely to be used in the same way.
985 ***************************************************************************/
987 bool dbgtext( const char *format_str, ... )
994 va_start(ap, format_str);
995 res = vasprintf(&msgbuf, format_str, ap);
999 format_debug_text(msgbuf);
1008 /* the registered mutex handlers */
1011 struct debug_ops ops;
1015 log suspicious usage - print comments and backtrace
1017 _PUBLIC_ void log_suspicious_usage(const char *from, const char *info)
1019 if (!debug_handlers.ops.log_suspicious_usage) return;
1021 debug_handlers.ops.log_suspicious_usage(from, info);
1026 print suspicious usage - print comments and backtrace
1028 _PUBLIC_ void print_suspicious_usage(const char* from, const char* info)
1030 if (!debug_handlers.ops.print_suspicious_usage) return;
1032 debug_handlers.ops.print_suspicious_usage(from, info);
1035 _PUBLIC_ uint32_t get_task_id(void)
1037 if (debug_handlers.ops.get_task_id) {
1038 return debug_handlers.ops.get_task_id();
1043 _PUBLIC_ void log_task_id(void)
1045 if (!debug_handlers.ops.log_task_id) return;
1047 if (!reopen_logs_internal()) return;
1049 debug_handlers.ops.log_task_id(state.fd);
1053 register a set of debug handlers.
1055 _PUBLIC_ void register_debug_handlers(const char *name, struct debug_ops *ops)
1057 debug_handlers.name = name;
1058 debug_handlers.ops = *ops;