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 * ************************************************************************** **
117 BlockSignals( True, SIGUSR2 );
123 DEBUG( 0, ( "Got SIGUSR2; set debug level to %d.\n", DEBUGLEVEL ) );
125 BlockSignals( False, SIGUSR2 );
127 #ifndef DONT_REINSTALL_SIG
128 signal( SIGUSR2, SIGNAL_CAST sig_usr2 );
135 /* ************************************************************************** **
136 * catch a sigusr1 - increase the debug log level.
137 * ************************************************************************** **
141 BlockSignals( True, SIGUSR1 );
145 if( DEBUGLEVEL > 10 )
148 DEBUG( 0, ( "Got SIGUSR1; set debug level to %d.\n", DEBUGLEVEL ) );
150 BlockSignals( False, SIGUSR1 );
151 #ifndef DONT_REINSTALL_SIG
152 signal( SIGUSR1, SIGNAL_CAST sig_usr1 );
159 /* ************************************************************************** **
160 * get ready for syslog stuff
161 * ************************************************************************** **
163 void setup_logging( char *pname, BOOL interactive )
167 stdout_logging = True;
173 char *p = strrchr( pname,'/' );
178 openlog( pname, LOG_PID, SYSLOG_FACILITY );
179 #else /* for old systems that have no facility codes. */
180 openlog( pname, LOG_PID );
184 } /* setup_logging */
186 /* ************************************************************************** **
187 * reopen the log files
188 * ************************************************************************** **
190 void reopen_logs( void )
196 pstrcpy( fname, debugf );
197 if( lp_loaded() && (*lp_logfile()) )
198 pstrcpy( fname, lp_logfile() );
200 if( !strcsequal( fname, debugf ) || !dbf || !file_exist( debugf, NULL ) )
202 int oldumask = umask( 022 );
204 pstrcpy( debugf, fname );
208 dbf = fopen( debugf, "a" );
210 dbf = fopen( debugf, "w" );
212 * Fix from klausr@ITAP.Physik.Uni-Stuttgart.De
213 * to fix problem where smbd's that generate less
214 * than 100 messages keep growing the log.
216 force_check_log_size();
232 /* ************************************************************************** **
233 * Force a check of the log size.
234 * ************************************************************************** **
236 void force_check_log_size( void )
239 } /* force_check_log_size */
241 /* ************************************************************************** **
242 * Check to see if the log has grown to be too big.
243 * ************************************************************************** **
245 static void check_log_size( void )
250 if( debug_count++ < 100 || getuid() != 0)
253 maxlog = lp_max_log_size() * 1024;
254 if( !dbf || maxlog <= 0 )
257 if( fstat( fileno( dbf ), &st ) == 0 && st.st_size > maxlog )
262 if( dbf && file_size( debugf ) > maxlog )
268 slprintf( name, sizeof(name)-1, "%s.old", debugf );
269 rename( debugf, name );
274 } /* check_log_size */
276 /* ************************************************************************** **
277 * Write an debug message on the debugfile.
278 * This is called by dbghdr() and format_debug_text().
279 * ************************************************************************** **
282 int Debug1( char *format_str, ... )
291 int old_errno = errno;
296 va_start( ap, format_str );
299 format_str = va_arg( ap, char * );
301 vfprintf( dbf, format_str, ap );
308 if( !lp_syslog_only() )
313 int oldumask = umask( 022 );
316 dbf = fopen( debugf, "a" );
318 dbf = fopen( debugf, "w" );
333 if( syslog_level < lp_syslog() )
335 /* map debug levels to syslog() priorities
336 * note that not all DEBUG(0, ...) calls are
339 static int priority_map[] = {
348 if( syslog_level >= ( sizeof(priority_map) / sizeof(priority_map[0]) )
350 priority = LOG_DEBUG;
352 priority = priority_map[syslog_level];
355 va_start( ap, format_str );
358 format_str = va_arg( ap, char * );
360 vslprintf( msgbuf, sizeof(msgbuf)-1, format_str, ap );
364 syslog( priority, "%s", msgbuf );
369 if( !lp_syslog_only() )
373 va_start( ap, format_str );
376 format_str = va_arg( ap, char * );
378 vfprintf( dbf, format_str, ap );
390 /* ************************************************************************** **
391 * Format the debug message text.
393 * Input: msg - Text to be added to the "current" debug message text.
397 * Notes: The purpose of this is two-fold. First, each call to syslog()
398 * (used by Debug1(), see above) generates a new line of syslog
399 * output. This is fixed by storing the partial lines until the
400 * newline character is encountered. Second, printing the debug
401 * message lines when a newline is encountered allows us to add
402 * spaces, thus indenting the body of the message and making it
405 * ************************************************************************** **
407 static void format_debug_text( char *msg )
409 int max = sizeof( format_bufr ) - 1;
412 for( i = 0; msg[i]; i++ )
414 /* Indent two spaces at each new line. */
415 if( 0 == format_pos )
417 format_bufr[0] = format_bufr[1] = ' ';
421 /* If there's room, copy the character to the format buffer. */
422 if( format_pos < max )
423 format_bufr[format_pos++] = msg[i];
425 /* If a newline is encountered, print & restart. */
428 format_bufr[format_pos] = '\0';
429 Debug1( format_bufr );
434 /* Just to be safe... */
435 format_bufr[format_pos] = '\0';
436 } /* format_debug_text */
438 /* ************************************************************************** **
439 * Print a Debug Header.
441 * Input: level - Debug level of the message (not the system-wide debug
443 * file - Pointer to a string containing the name of the file
444 * from which this function was called, or an empty string
445 * if the __FILE__ macro is not implemented.
446 * func - Pointer to a string containing the name of the function
447 * from which this function was called, or an empty string
448 * if the __FUNCTION__ macro is not implemented.
449 * line - line number of the call to dbghdr, assuming __LINE__
452 * Output: Always True. This makes it easy to fudge a call to dbghdr()
453 * in a macro, since the function can be called as part of a test.
454 * Eg: ( (level <= DEBUGLEVEL) && (dbghdr(level,"",line)) )
456 * Notes: This function takes care of setting syslog_level.
458 * ************************************************************************** **
460 BOOL dbghdr( int level, char *file, char *func, int line )
464 /* This is a fudge. If there is stuff sitting in the format_bufr, then
465 * the *right* thing to do is to call
466 * format_debug_text( "\n" );
467 * to write the remainder, and then proceed with the new header.
468 * Unfortunately, there are several places in the code at which
469 * the DEBUG() macro is used to build partial lines. That in mind,
470 * we'll work under the assumption that an incomplete line indicates
471 * that a new header is *not* desired.
476 /* Set syslog_level. */
477 syslog_level = level;
479 /* Don't print a header if we're logging to stdout. */
483 /* Print it all out at once. */
484 Debug1( "[%s, %d] %s%s%s(%d)\n",
485 timestring(), level, file, (*file)?":":"", func, line );
489 /* ************************************************************************** **
490 * Add text to the body of the "current" debug message via the format buffer.
492 * Input: format_str - Format string, as used in printf(), et. al.
493 * ... - Variable argument list.
495 * ..or.. va_alist - Old style variable parameter list starting point.
497 * Output: Always True. See dbghdr() for more info, though this is not
498 * likely to be used in the same way.
500 * ************************************************************************** **
503 BOOL dbgtext( char *format_str, ... )
508 va_start( ap, format_str );
509 vslprintf( msgbuf, sizeof(msgbuf)-1, format_str, ap );
512 format_debug_text( msgbuf );
518 BOOL dbgtext( va_alist )
526 format_str = va_arg( ap, char * );
527 vslprintf( msgbuf, sizeof(msgbuf)-1, format_str, ap );
530 format_debug_text( msgbuf );
537 /* ************************************************************************** */