2025-02-28 01:58:17 +03:00 · 1998-07-31 20:17:36 +00:00 · 1998-07-31 20:17:36 +00:00 · e6b8685091
commit e6b8685091
parent ebd415c03f
1 changed files with 533 additions and 0 deletions
--- a/source3/lib/debug.c
+++ b/source3/lib/debug.c
@ -0,0 +1,533 @@
+/*
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   Samba utility functions
+   Copyright (C) Andrew Tridgell 1992-1998
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/* -------------------------------------------------------------------------- **
+ * This module implements Samba's debugging utility.
+ *
+ * The syntax of a debugging log file is represented as:
+ *
+ *  <debugfile> :== { <debugmsg> }
+ *
+ *  <debugmsg>  :== <debughdr> '\n' <debugtext>
+ *
+ *  <debughdr>  :== '[' TIME ',' LEVEL ']' [ [FILENAME ':'] [FUNCTION '()'] ]
+ *
+ *  <debugtext> :== { <debugline> }
+ *
+ *  <debugline> :== TEXT '\n'
+ *
+ * TEXT     is a string of characters excluding the newline character.
+ * LEVEL    is the DEBUG level of the message (an integer in the range 0..10).
+ * TIME     is a timestamp.
+ * FILENAME is the name of the file from which the debug message was generated.
+ * FUNCTION is the function from which the debug message was generated.
+ *
+ * Basically, what that all means is:
+ *
+ * - A debugging log file is made up of debug messages.
+ *
+ * - Each debug message is made up of a header and text.  The header is
+ *   separated from the text by a newline.
+ *
+ * - The header begins with the timestamp and debug level of the message
+ *   enclosed in brackets.  The filename and function from which the
+ *   message was generated may follow.  The filename is terminated by a
+ *   colon, and the function name is terminated by parenthesis.
+ *
+ * - The message text is made up of zero or more lines, each terminated by
+ *   a newline.
+ */
+
+/* -------------------------------------------------------------------------- **
+ * External variables.
+ *
+ *  dbf           - Global debug file handle.
+ *  debugf        - Debug file name.
+ *  append_log    - If True, then the output file will be opened in append
+ *                  mode.
+ *  DEBUGLEVEL    - System-wide debug message limit.  Messages with message-
+ *                  levels higher than DEBUGLEVEL will not be processed.
+ */
+
+FILE   *dbf        = NULL;
+pstring debugf     = "";
+BOOL    append_log = False;
+int     DEBUGLEVEL = 1;
+
+
+/* -------------------------------------------------------------------------- **
+ * Internal variables.
+ *
+ *  stdout_logging  - Default False, if set to True then dbf will be set to
+ *                    stdout and debug output will go to dbf only, and not
+ *                    to syslog.  Set in setup_logging() and read in Debug1().
+ *
+ *  debug_count     - Number of debug messages that have been output.
+ *                    Used to check log size.
+ *
+ *  syslog_level    - Internal copy of the message debug level.  Written by
+ *                    dbghdr() and read by Debug1().
+ *
+ *  format_bufr     - Used to format debug messages.  The dbgtext() function
+ *                    prints debug messages to a string, and then passes the
+ *                    string to format_debug_text(), which uses format_bufr
+ *                    to build the formatted output.
+ *
+ *  format_pos      - Marks the first free byte of the format_bufr.
+ */
+
+static BOOL    stdout_logging = False;
+static int     debug_count    = 0;
+static int     syslog_level   = 0;
+static pstring format_bufr    = { '\0' };
+static int     format_pos     = 0;
+
+
+/* -------------------------------------------------------------------------- **
+ * Functions...
+ */
+
+#if defined(SIGUSR2)
+/* ************************************************************************** **
+ * catch a sigusr2 - decrease the debug log level.
+ * ************************************************************************** **
+ */
+int sig_usr2( void )
+  {
+  BlockSignals( True, SIGUSR2 );
+
+  DEBUGLEVEL--;
+  if( DEBUGLEVEL < 0 )
+    DEBUGLEVEL = 0;
+
+  DEBUG( 0, ( "Got SIGUSR2; set debug level to %d.\n", DEBUGLEVEL ) );
+
+  BlockSignals( False, SIGUSR2 );
+
+#ifndef DONT_REINSTALL_SIG
+  signal( SIGUSR2, SIGNAL_CAST sig_usr2 );
+#endif
+  return( 0 );
+  } /* sig_usr2 */
+#endif /* SIGUSR1 */
+   
+#if defined(SIGUSR1)
+/* ************************************************************************** **
+ * catch a sigusr1 - increase the debug log level. 
+ * ************************************************************************** **
+ */
+int sig_usr1( void )
+  {
+  BlockSignals( True, SIGUSR1 );
+
+  DEBUGLEVEL++;
+
+  if( DEBUGLEVEL > 10 )
+    DEBUGLEVEL = 10;
+
+  DEBUG( 0, ( "Got SIGUSR1; set debug level to %d.\n", DEBUGLEVEL ) );
+
+  BlockSignals( False, SIGUSR1 );
+#ifndef DONT_REINSTALL_SIG
+  signal( SIGUSR1, SIGNAL_CAST sig_usr1 );
+#endif
+  return( 0 );
+  } /* sig_usr1 */
+#endif /* SIGUSR1 */
+
+
+/* ************************************************************************** **
+ * get ready for syslog stuff
+ * ************************************************************************** **
+ */
+void setup_logging( char *pname, BOOL interactive )
+  {
+  if( interactive )
+    {
+    stdout_logging = True;
+    dbf = stdout;
+    }
+#ifdef SYSLOG
+  else
+    {
+    char *p = strrchr( pname,'/' );
+
+    if( p )
+      pname = p + 1;
+#ifdef LOG_DAEMON
+    openlog( pname, LOG_PID, SYSLOG_FACILITY );
+#else /* for old systems that have no facility codes. */
+    openlog( pname, LOG_PID );
+#endif
+    }
+#endif
+  } /* setup_logging */
+
+/* ************************************************************************** **
+ * reopen the log files
+ * ************************************************************************** **
+ */
+void reopen_logs( void )
+  {
+  pstring fname;
+  
+  if( DEBUGLEVEL > 0 )
+    {
+    pstrcpy( fname, debugf );
+    if( lp_loaded() && (*lp_logfile()) )
+      pstrcpy( fname, lp_logfile() );
+
+    if( !strcsequal( fname, debugf ) || !dbf || !file_exist( debugf, NULL ) )
+      {
+      int oldumask = umask( 022 );
+
+      pstrcpy( debugf, fname );
+      if( dbf )
+        fclose( dbf );
+      if( append_log )
+        dbf = fopen( debugf, "a" );
+      else
+        dbf = fopen( debugf, "w" );
+      /*
+       * Fix from klausr@ITAP.Physik.Uni-Stuttgart.De
+       * to fix problem where smbd's that generate less
+       * than 100 messages keep growing the log.
+       */
+      force_check_log_size();
+      if( dbf )
+        setbuf( dbf, NULL );
+      umask( oldumask );
+      }
+    }
+  else
+    {
+    if( dbf )
+      {
+      fclose( dbf );
+      dbf = NULL;
+      }
+    }
+  } /* reopen_logs */
+
+/* ************************************************************************** **
+ * Force a check of the log size.
+ * ************************************************************************** **
+ */
+void force_check_log_size( void )
+  {
+  debug_count = 100;
+  } /* force_check_log_size */
+
+/* ************************************************************************** **
+ * Check to see if the log has grown to be too big.
+ * ************************************************************************** **
+ */
+static void check_log_size( void )
+  {
+  int         maxlog;
+  struct stat st;
+
+  if( debug_count++ < 100 || getuid() != 0)
+    return;
+
+  maxlog = lp_max_log_size() * 1024;
+  if( !dbf || maxlog <= 0 )
+    return;
+
+  if( fstat( fileno( dbf ), &st ) == 0 && st.st_size > maxlog )
+    {
+    fclose( dbf );
+    dbf = NULL;
+    reopen_logs();
+    if( dbf && file_size( debugf ) > maxlog )
+      {
+      pstring name;
+
+      fclose( dbf );
+      dbf = NULL;
+      slprintf( name, sizeof(name)-1, "%s.old", debugf );
+      rename( debugf, name );
+      reopen_logs();
+      }
+    }
+  debug_count = 0;
+  } /* check_log_size */
+
+/* ************************************************************************** **
+ * Write an debug message on the debugfile.
+ * This is called by dbghdr() and format_debug_text().
+ * ************************************************************************** **
+ */
+#ifdef __STDC__
+ int Debug1( char *format_str, ... )
+{
+#else
+ int Debug1(va_alist)
+va_dcl
+{  
+  char *format_str;
+#endif
+  va_list ap;  
+  int old_errno = errno;
+
+  if( stdout_logging )
+    {
+#ifdef __STDC__
+    va_start( ap, format_str );
+#else
+    va_start( ap );
+    format_str = va_arg( ap, char * );
+#endif
+    vfprintf( dbf, format_str, ap );
+    va_end( ap );
+    errno = old_errno;
+    return( 0 );
+    }
+  
+#ifdef SYSLOG
+  if( !lp_syslog_only() )
+#endif
+    {
+    if( !dbf )
+      {
+      int oldumask = umask( 022 );
+
+      if( append_log )
+        dbf = fopen( debugf, "a" );
+      else
+        dbf = fopen( debugf, "w" );
+      umask( oldumask );
+      if( dbf )
+        {
+        setbuf( dbf, NULL );
+        }
+      else
+        {
+        errno = old_errno;
+        return(0);
+        }
+      }
+    }
+
+#ifdef SYSLOG
+  if( syslog_level < lp_syslog() )
+    {
+    /* map debug levels to syslog() priorities
+     * note that not all DEBUG(0, ...) calls are
+     * necessarily errors
+     */
+    static int priority_map[] = { 
+      LOG_ERR,     /* 0 */
+      LOG_WARNING, /* 1 */
+      LOG_NOTICE,  /* 2 */
+      LOG_INFO,    /* 3 */
+      };
+    int     priority;
+    pstring msgbuf;
+
+    if( syslog_level >= ( sizeof(priority_map) / sizeof(priority_map[0]) )
+     || syslog_level < 0)
+      priority = LOG_DEBUG;
+    else
+      priority = priority_map[syslog_level];
+      
+#ifdef __STDC__
+    va_start( ap, format_str );
+#else
+    va_start( ap );
+    format_str = va_arg( ap, char * );
+#endif
+    vslprintf( msgbuf, sizeof(msgbuf)-1, format_str, ap );
+    va_end( ap );
+      
+    msgbuf[255] = '\0';
+    syslog( priority, "%s", msgbuf );
+    }
+#endif
+  
+#ifdef SYSLOG
+  if( !lp_syslog_only() )
+#endif
+    {
+#ifdef __STDC__
+    va_start( ap, format_str );
+#else
+    va_start( ap );
+    format_str = va_arg( ap, char * );
+#endif
+    vfprintf( dbf, format_str, ap );
+    va_end( ap );
+    fflush( dbf );
+    }
+
+  check_log_size();
+
+  errno = old_errno;
+
+  return( 0 );
+  } /* Debug1 */
+
+/* ************************************************************************** **
+ * Format the debug message text.
+ *
+ *  Input:  msg - Text to be added to the "current" debug message text.
+ *
+ *  Output: none.
+ *
+ *  Notes:  The purpose of this is two-fold.  First, each call to syslog()
+ *          (used by Debug1(), see above) generates a new line of syslog
+ *          output.  This is fixed by storing the partial lines until the
+ *          newline character is encountered.  Second, printing the debug
+ *          message lines when a newline is encountered allows us to add
+ *          spaces, thus indenting the body of the message and making it
+ *          more readable.
+ *
+ * ************************************************************************** **
+ */
+static void format_debug_text( char *msg )
+  {
+  int max = sizeof( format_bufr ) - 1;
+  int i;
+
+  for( i = 0; msg[i]; i++ )
+    {
+    /* Indent two spaces at each new line. */
+    if( 0 == format_pos )
+      {
+      format_bufr[0] = format_bufr[1] = ' ';
+      format_pos = 2;
+      }
+
+    /* If there's room, copy the character to the format buffer. */
+    if( format_pos < max )
+      format_bufr[format_pos++] = msg[i];
+
+    /* If a newline is encountered, print & restart. */
+    if( '\n' == msg[i] )
+      {
+      format_bufr[format_pos] = '\0';
+      Debug1( format_bufr );
+      format_pos = 0;
+      }
+    }
+
+  /* Just to be safe... */
+  format_bufr[format_pos] = '\0';
+  } /* format_debug_text */
+
+/* ************************************************************************** **
+ * Print a Debug Header.
+ *
+ *  Input:  level - Debug level of the message (not the system-wide debug
+ *                  level.
+ *          file  - Pointer to a string containing the name of the file
+ *                  from which this function was called, or an empty string
+ *                  if the __FILE__ macro is not implemented.
+ *          func  - Pointer to a string containing the name of the function
+ *                  from which this function was called, or an empty string
+ *                  if the __FUNCTION__ macro is not implemented.
+ *          line  - line number of the call to dbghdr, assuming __LINE__
+ *                  works.
+ *
+ *  Output: Always True.  This makes it easy to fudge a call to dbghdr()
+ *          in a macro, since the function can be called as part of a test.
+ *          Eg: ( (level <= DEBUGLEVEL) && (dbghdr(level,"",line)) )
+ *
+ *  Notes:  This function takes care of setting syslog_level.
+ *
+ * ************************************************************************** **
+ */
+BOOL dbghdr( int level, char *file, char *func, int line )
+  {
+  if( format_pos )
+    {
+    /* This is a fudge.  If there is stuff sitting in the format_bufr, then
+     * the *right* thing to do is to call
+     *   format_debug_text( "\n" );
+     * to write the remainder, and then proceed with the new header.
+     * Unfortunately, there are several places in the code at which
+     * the DEBUG() macro is used to build partial lines.  That in mind,
+     * we'll work under the assumption that an incomplete line indicates
+     * that a new header is *not* desired.
+     */
+    return( True );
+    }
+
+  /* Set syslog_level. */
+  syslog_level = level;
+
+  /* Print it all out at once. */
+  Debug1( "[%s, %d] %s%s%s(%d)\n",
+          timestring(), level, file, (*file)?":":"", func, line );
+  return( True );
+  } /* dbghdr */
+
+/* ************************************************************************** **
+ * Add text to the body of the "current" debug message via the format buffer.
+ *
+ *  Input:  format_str  - Format string, as used in printf(), et. al.
+ *          ...         - Variable argument list.
+ *
+ *  ..or..  va_alist    - Old style variable parameter list starting point.
+ *
+ *  Output: Always True.  See dbghdr() for more info, though this is not
+ *          likely to be used in the same way.
+ *
+ * ************************************************************************** **
+ */
+#ifdef __STDC__
+ BOOL dbgtext( char *format_str, ... )
+  {
+  va_list ap;
+  pstring msgbuf;
+
+  va_start( ap, format_str ); 
+  vslprintf( msgbuf, sizeof(msgbuf)-1, format_str, ap );
+  va_end( ap );
+
+  format_debug_text( msgbuf );
+
+  return( True );
+  } /* dbgtext */
+
+#else
+ BOOL dbgtext( va_alist )
+ va_dcl
+  {
+  char *format_str;
+  va_list ap;
+  pstring msgbuf;
+
+  va_start( ap );
+  format_str = va_arg( ap, char * );
+  vslprintf( msgbuf, sizeof(msgbuf)-1, format_str, ap );
+  va_end( ap );
+
+  format_debug_text( msgbuf );
+
+  return( True );
+  } /* dbgtext */
+
+#endif
+
+/* ************************************************************************** */