2 Unix SMB/Netbios implementation.
4 Samba utility functions
5 Copyright (C) Andrew Tridgell 1992-1998
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 /* -------------------------------------------------------------------------- **
25 * This module implements Samba's debugging utility.
27 * The syntax of a debugging log file is represented as:
29 * <debugfile> :== { <debugmsg> }
31 * <debugmsg> :== <debughdr> '\n' <debugtext>
33 * <debughdr> :== '[' TIME ',' LEVEL ']' [ [FILENAME ':'] [FUNCTION '()'] ]
35 * <debugtext> :== { <debugline> }
37 * <debugline> :== TEXT '\n'
39 * TEXT is a string of characters excluding the newline character.
40 * LEVEL is the DEBUG level of the message (an integer in the range 0..10).
41 * TIME is a timestamp.
42 * FILENAME is the name of the file from which the debug message was generated.
43 * FUNCTION is the function from which the debug message was generated.
45 * Basically, what that all means is:
47 * - A debugging log file is made up of debug messages.
49 * - Each debug message is made up of a header and text. The header is
50 * separated from the text by a newline.
52 * - The header begins with the timestamp and debug level of the message
53 * enclosed in brackets. The filename and function from which the
54 * message was generated may follow. The filename is terminated by a
55 * colon, and the function name is terminated by parenthesis.
57 * - The message text is made up of zero or more lines, each terminated by
61 /* -------------------------------------------------------------------------- **
64 * dbf - Global debug file handle.
65 * debugf - Debug file name.
66 * append_log - If True, then the output file will be opened in append
68 * DEBUGLEVEL - System-wide debug message limit. Messages with message-
69 * levels higher than DEBUGLEVEL will not be processed.
74 BOOL append_log = False;
78 /* -------------------------------------------------------------------------- **
81 * stdout_logging - Default False, if set to True then dbf will be set to
82 * stdout and debug output will go to dbf only, and not
83 * to syslog. Set in setup_logging() and read in Debug1().
85 * debug_count - Number of debug messages that have been output.
86 * Used to check log size.
88 * syslog_level - Internal copy of the message debug level. Written by
89 * dbghdr() and read by Debug1().
91 * format_bufr - Used to format debug messages. The dbgtext() function
92 * prints debug messages to a string, and then passes the
93 * string to format_debug_text(), which uses format_bufr
94 * to build the formatted output.
96 * format_pos - Marks the first free byte of the format_bufr.
99 static BOOL stdout_logging = False;
100 static int debug_count = 0;
101 static int syslog_level = 0;
102 static pstring format_bufr = { '\0' };
103 static int format_pos = 0;
106 /* -------------------------------------------------------------------------- **
111 /* ************************************************************************** **
112 * catch a sigusr2 - decrease the debug log level.
113 * ************************************************************************** **
115 void sig_usr2( int sig )
117 BlockSignals( True, SIGUSR2 );
123 DEBUG( 0, ( "Got SIGUSR2; set debug level to %d.\n", DEBUGLEVEL ) );
125 BlockSignals( False, SIGUSR2 );
126 CatchSignal( SIGUSR2, SIGNAL_CAST sig_usr2 );
132 /* ************************************************************************** **
133 * catch a sigusr1 - increase the debug log level.
134 * ************************************************************************** **
136 void sig_usr1( int sig )
138 BlockSignals( True, SIGUSR1 );
142 if( DEBUGLEVEL > 10 )
145 DEBUG( 0, ( "Got SIGUSR1; set debug level to %d.\n", DEBUGLEVEL ) );
147 BlockSignals( False, SIGUSR1 );
148 CatchSignal( SIGUSR1, SIGNAL_CAST sig_usr1 );
154 /* ************************************************************************** **
155 * get ready for syslog stuff
156 * ************************************************************************** **
158 void setup_logging( char *pname, BOOL interactive )
162 stdout_logging = True;
168 char *p = strrchr( pname,'/' );
173 openlog( pname, LOG_PID, SYSLOG_FACILITY );
174 #else /* for old systems that have no facility codes. */
175 openlog( pname, LOG_PID );
179 } /* setup_logging */
181 /* ************************************************************************** **
182 * reopen the log files
183 * ************************************************************************** **
185 void reopen_logs( void )
191 pstrcpy( fname, debugf );
192 if( lp_loaded() && (*lp_logfile()) )
193 pstrcpy( fname, lp_logfile() );
195 if( !strcsequal( fname, debugf ) || !dbf || !file_exist( debugf, NULL ) )
197 int oldumask = umask( 022 );
199 pstrcpy( debugf, fname );
203 dbf = fopen( debugf, "a" );
205 dbf = fopen( debugf, "w" );
206 /* Fix from klausr@ITAP.Physik.Uni-Stuttgart.De
207 * to fix problem where smbd's that generate less
208 * than 100 messages keep growing the log.
210 force_check_log_size();
213 (void)umask( oldumask );
226 /* ************************************************************************** **
227 * Force a check of the log size.
228 * ************************************************************************** **
230 void force_check_log_size( void )
233 } /* force_check_log_size */
235 /* ************************************************************************** **
236 * Check to see if the log has grown to be too big.
237 * ************************************************************************** **
239 static void check_log_size( void )
244 if( debug_count++ < 100 || getuid() != 0 )
247 maxlog = lp_max_log_size() * 1024;
248 if( !dbf || maxlog <= 0 )
251 if( fstat( fileno( dbf ), &st ) == 0 && st.st_size > maxlog )
256 if( dbf && file_size( debugf ) > maxlog )
262 slprintf( name, sizeof(name)-1, "%s.old", debugf );
263 (void)rename( debugf, name );
268 } /* check_log_size */
270 /* ************************************************************************** **
271 * Write an debug message on the debugfile.
272 * This is called by dbghdr() and format_debug_text().
273 * ************************************************************************** **
276 int Debug1( char *format_str, ... )
285 int old_errno = errno;
290 va_start( ap, format_str );
293 format_str = va_arg( ap, char * );
295 (void)vfprintf( dbf, format_str, ap );
302 if( !lp_syslog_only() )
307 int oldumask = umask( 022 );
310 dbf = fopen( debugf, "a" );
312 dbf = fopen( debugf, "w" );
313 (void)umask( oldumask );
327 if( syslog_level < lp_syslog() )
329 /* map debug levels to syslog() priorities
330 * note that not all DEBUG(0, ...) calls are
333 static int priority_map[] = {
342 if( syslog_level >= ( sizeof(priority_map) / sizeof(priority_map[0]) )
344 priority = LOG_DEBUG;
346 priority = priority_map[syslog_level];
349 va_start( ap, format_str );
352 format_str = va_arg( ap, char * );
354 vslprintf( msgbuf, sizeof(msgbuf)-1, format_str, ap );
358 syslog( priority, "%s", msgbuf );
363 if( !lp_syslog_only() )
367 va_start( ap, format_str );
370 format_str = va_arg( ap, char * );
372 (void)vfprintf( dbf, format_str, ap );
385 /* ************************************************************************** **
386 * Print the buffer content via Debug1(), then reset the buffer.
391 * ************************************************************************** **
393 static void bufr_print( void )
395 format_bufr[format_pos] = '\0';
396 (void)Debug1( "%s", format_bufr );
400 /* ************************************************************************** **
401 * Format the debug message text.
403 * Input: msg - Text to be added to the "current" debug message text.
407 * Notes: The purpose of this is two-fold. First, each call to syslog()
408 * (used by Debug1(), see above) generates a new line of syslog
409 * output. This is fixed by storing the partial lines until the
410 * newline character is encountered. Second, printing the debug
411 * message lines when a newline is encountered allows us to add
412 * spaces, thus indenting the body of the message and making it
415 * ************************************************************************** **
417 static void format_debug_text( char *msg )
419 int max = sizeof( format_bufr ) - 1;
422 for( i = 0; msg[i]; i++ )
424 /* Indent two spaces at each new line. */
425 if( 0 == format_pos )
427 format_bufr[0] = format_bufr[1] = ' ';
431 /* If there's room, copy the character to the format buffer. */
432 if( format_pos < max )
433 format_bufr[format_pos++] = msg[i];
435 /* If a newline is encountered, print & restart. */
440 /* Just to be safe... */
441 format_bufr[format_pos] = '\0';
442 } /* format_debug_text */
444 /* ************************************************************************** **
445 * Flush debug output, including the format buffer content.
450 * ************************************************************************** **
452 void dbgflush( void )
458 /* ************************************************************************** **
459 * Print a Debug Header.
461 * Input: level - Debug level of the message (not the system-wide debug
463 * file - Pointer to a string containing the name of the file
464 * from which this function was called, or an empty string
465 * if the __FILE__ macro is not implemented.
466 * func - Pointer to a string containing the name of the function
467 * from which this function was called, or an empty string
468 * if the __FUNCTION__ macro is not implemented.
469 * line - line number of the call to dbghdr, assuming __LINE__
472 * Output: Always True. This makes it easy to fudge a call to dbghdr()
473 * in a macro, since the function can be called as part of a test.
474 * Eg: ( (level <= DEBUGLEVEL) && (dbghdr(level,"",line)) )
476 * Notes: This function takes care of setting syslog_level.
478 * ************************************************************************** **
480 BOOL dbghdr( int level, char *file, char *func, int line )
484 /* This is a fudge. If there is stuff sitting in the format_bufr, then
485 * the *right* thing to do is to call
486 * format_debug_text( "\n" );
487 * to write the remainder, and then proceed with the new header.
488 * Unfortunately, there are several places in the code at which
489 * the DEBUG() macro is used to build partial lines. That in mind,
490 * we'll work under the assumption that an incomplete line indicates
491 * that a new header is *not* desired.
496 /* Set syslog_level. */
497 syslog_level = level;
499 /* Don't print a header if we're logging to stdout. */
503 /* Print the header if timestamps are turned on. If parameters are
504 * not yet loaded, then default to timestamps on.
506 if( lp_timestamp_logs() || !(lp_loaded()) )
508 /* Print it all out at once to prevent split syslog output. */
509 (void)Debug1( "[%s, %d] %s:%s(%d)\n",
510 timestring(), level, file, func, line );
516 /* ************************************************************************** **
517 * Add text to the body of the "current" debug message via the format buffer.
519 * Input: format_str - Format string, as used in printf(), et. al.
520 * ... - Variable argument list.
522 * ..or.. va_alist - Old style variable parameter list starting point.
524 * Output: Always True. See dbghdr() for more info, though this is not
525 * likely to be used in the same way.
527 * ************************************************************************** **
530 BOOL dbgtext( char *format_str, ... )
535 va_start( ap, format_str );
536 vslprintf( msgbuf, sizeof(msgbuf)-1, format_str, ap );
539 format_debug_text( msgbuf );
545 BOOL dbgtext( va_alist )
553 format_str = va_arg( ap, char * );
554 vslprintf( msgbuf, sizeof(msgbuf)-1, format_str, ap );
557 format_debug_text( msgbuf );
564 /* ************************************************************************** */