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614 lines
16 KiB
C
614 lines
16 KiB
C
/**
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* logging.c - Centralised logging. Originated from the Linux-NTFS project.
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*
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* Copyright (c) 2005 Richard Russon
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* Copyright (c) 2005-2008 Szabolcs Szakacsits
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the NTFS-3G
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_STDARG_H
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#include <stdarg.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_SYSLOG_H
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#include <syslog.h>
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#endif
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#include "logging.h"
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#include "misc.h"
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#ifndef PATH_SEP
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#define PATH_SEP '/'
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#endif
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#ifdef DEBUG
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static int tab;
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#endif
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/* Some gcc 3.x, 4.[01].X crash with internal compiler error. */
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#if __GNUC__ <= 3 || (__GNUC__ == 4 && __GNUC_MINOR__ <= 1)
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# define BROKEN_GCC_FORMAT_ATTRIBUTE
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#else
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# define BROKEN_GCC_FORMAT_ATTRIBUTE __attribute__((format(printf, 6, 0)))
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#endif
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/**
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* struct ntfs_logging - Control info for the logging system
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* @levels: Bitfield of logging levels
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* @flags: Flags which affect the output style
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* @handler: Function to perform the actual logging
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*/
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struct ntfs_logging {
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u32 levels;
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u32 flags;
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ntfs_log_handler *handler BROKEN_GCC_FORMAT_ATTRIBUTE;
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};
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/**
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* ntfs_log
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* This struct controls all the logging within the library and tools.
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*/
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static struct ntfs_logging ntfs_log = {
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#ifdef DEBUG
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NTFS_LOG_LEVEL_DEBUG | NTFS_LOG_LEVEL_TRACE | NTFS_LOG_LEVEL_ENTER |
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NTFS_LOG_LEVEL_LEAVE |
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#endif
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NTFS_LOG_LEVEL_INFO | NTFS_LOG_LEVEL_QUIET | NTFS_LOG_LEVEL_WARNING |
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NTFS_LOG_LEVEL_ERROR | NTFS_LOG_LEVEL_PERROR | NTFS_LOG_LEVEL_CRITICAL |
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NTFS_LOG_LEVEL_PROGRESS,
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NTFS_LOG_FLAG_ONLYNAME,
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#ifdef DEBUG
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ntfs_log_handler_outerr
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#else
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ntfs_log_handler_null
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#endif
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};
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/**
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* ntfs_log_get_levels - Get a list of the current logging levels
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*
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* Find out which logging levels are enabled.
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*
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* Returns: Log levels in a 32-bit field
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*/
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u32 ntfs_log_get_levels(void)
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{
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return ntfs_log.levels;
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}
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/**
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* ntfs_log_set_levels - Enable extra logging levels
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* @levels: 32-bit field of log levels to set
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*
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* Enable one or more logging levels.
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* The logging levels are named: NTFS_LOG_LEVEL_*.
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*
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* Returns: Log levels that were enabled before the call
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*/
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u32 ntfs_log_set_levels(u32 levels)
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{
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u32 old;
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old = ntfs_log.levels;
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ntfs_log.levels |= levels;
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return old;
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}
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/**
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* ntfs_log_clear_levels - Disable some logging levels
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* @levels: 32-bit field of log levels to clear
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*
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* Disable one or more logging levels.
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* The logging levels are named: NTFS_LOG_LEVEL_*.
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*
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* Returns: Log levels that were enabled before the call
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*/
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u32 ntfs_log_clear_levels(u32 levels)
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{
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u32 old;
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old = ntfs_log.levels;
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ntfs_log.levels &= (~levels);
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return old;
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}
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/**
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* ntfs_log_get_flags - Get a list of logging style flags
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*
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* Find out which logging flags are enabled.
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*
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* Returns: Logging flags in a 32-bit field
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*/
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u32 ntfs_log_get_flags(void)
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{
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return ntfs_log.flags;
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}
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/**
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* ntfs_log_set_flags - Enable extra logging style flags
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* @flags: 32-bit field of logging flags to set
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*
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* Enable one or more logging flags.
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* The log flags are named: NTFS_LOG_LEVEL_*.
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*
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* Returns: Logging flags that were enabled before the call
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*/
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u32 ntfs_log_set_flags(u32 flags)
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{
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u32 old;
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old = ntfs_log.flags;
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ntfs_log.flags |= flags;
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return old;
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}
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/**
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* ntfs_log_clear_flags - Disable some logging styles
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* @flags: 32-bit field of logging flags to clear
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*
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* Disable one or more logging flags.
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* The log flags are named: NTFS_LOG_LEVEL_*.
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*
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* Returns: Logging flags that were enabled before the call
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*/
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u32 ntfs_log_clear_flags(u32 flags)
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{
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u32 old;
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old = ntfs_log.flags;
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ntfs_log.flags &= (~flags);
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return old;
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}
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/**
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* ntfs_log_get_stream - Default output streams for logging levels
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* @level: Log level
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*
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* By default, urgent messages are sent to "stderr".
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* Other messages are sent to "stdout".
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*
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* Returns: "string" Prefix to be used
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*/
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static FILE * ntfs_log_get_stream(u32 level)
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{
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FILE *stream;
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switch (level) {
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case NTFS_LOG_LEVEL_INFO:
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case NTFS_LOG_LEVEL_QUIET:
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case NTFS_LOG_LEVEL_PROGRESS:
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case NTFS_LOG_LEVEL_VERBOSE:
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stream = stdout;
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break;
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case NTFS_LOG_LEVEL_DEBUG:
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case NTFS_LOG_LEVEL_TRACE:
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case NTFS_LOG_LEVEL_ENTER:
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case NTFS_LOG_LEVEL_LEAVE:
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case NTFS_LOG_LEVEL_WARNING:
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case NTFS_LOG_LEVEL_ERROR:
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case NTFS_LOG_LEVEL_CRITICAL:
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case NTFS_LOG_LEVEL_PERROR:
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default:
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stream = stderr;
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break;
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}
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return stream;
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}
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/**
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* ntfs_log_get_prefix - Default prefixes for logging levels
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* @level: Log level to be prefixed
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*
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* Prefixing the logging output can make it easier to parse.
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*
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* Returns: "string" Prefix to be used
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*/
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static const char * ntfs_log_get_prefix(u32 level)
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{
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const char *prefix;
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switch (level) {
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case NTFS_LOG_LEVEL_DEBUG:
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prefix = "DEBUG: ";
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break;
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case NTFS_LOG_LEVEL_TRACE:
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prefix = "TRACE: ";
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break;
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case NTFS_LOG_LEVEL_QUIET:
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prefix = "QUIET: ";
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break;
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case NTFS_LOG_LEVEL_INFO:
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prefix = "INFO: ";
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break;
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case NTFS_LOG_LEVEL_VERBOSE:
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prefix = "VERBOSE: ";
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break;
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case NTFS_LOG_LEVEL_PROGRESS:
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prefix = "PROGRESS: ";
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break;
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case NTFS_LOG_LEVEL_WARNING:
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prefix = "WARNING: ";
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break;
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case NTFS_LOG_LEVEL_ERROR:
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prefix = "ERROR: ";
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break;
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case NTFS_LOG_LEVEL_PERROR:
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prefix = "ERROR: ";
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break;
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case NTFS_LOG_LEVEL_CRITICAL:
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prefix = "CRITICAL: ";
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break;
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default:
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prefix = "";
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break;
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}
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return prefix;
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}
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/**
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* ntfs_log_set_handler - Provide an alternate logging handler
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* @handler: function to perform the logging
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*
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* This alternate handler will be called for all future logging requests.
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* If no @handler is specified, logging will revert to the default handler.
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*/
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void ntfs_log_set_handler(ntfs_log_handler *handler)
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{
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if (handler) {
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ntfs_log.handler = handler;
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#ifdef HAVE_SYSLOG_H
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if (handler == ntfs_log_handler_syslog)
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openlog("ntfs-3g", LOG_PID, LOG_USER);
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#endif
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} else
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ntfs_log.handler = ntfs_log_handler_null;
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}
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/**
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* ntfs_log_redirect - Pass on the request to the real handler
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* @function: Function in which the log line occurred
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* @file: File in which the log line occurred
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* @line: Line number on which the log line occurred
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* @level: Level at which the line is logged
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* @data: User specified data, possibly specific to a handler
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* @format: printf-style formatting string
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* @...: Arguments to be formatted
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*
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* This is just a redirector function. The arguments are simply passed to the
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* main logging handler (as defined in the global logging struct @ntfs_log).
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*
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* Returns: -1 Error occurred
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* 0 Message wasn't logged
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* num Number of output characters
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*/
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int ntfs_log_redirect(const char *function, const char *file,
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int line, u32 level, void *data, const char *format, ...)
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{
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int olderr = errno;
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int ret;
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va_list args;
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if (!(ntfs_log.levels & level)) /* Don't log this message */
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return 0;
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va_start(args, format);
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errno = olderr;
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ret = ntfs_log.handler(function, file, line, level, data, format, args);
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va_end(args);
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errno = olderr;
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return ret;
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}
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/**
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* ntfs_log_handler_syslog - syslog logging handler
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* @function: Function in which the log line occurred
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* @file: File in which the log line occurred
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* @line: Line number on which the log line occurred
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* @level: Level at which the line is logged
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* @data: User specified data, possibly specific to a handler
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* @format: printf-style formatting string
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* @args: Arguments to be formatted
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*
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* A simple syslog logging handler. Ignores colors.
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*
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* Returns: -1 Error occurred
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* 0 Message wasn't logged
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* num Number of output characters
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*/
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#ifdef HAVE_SYSLOG_H
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#define LOG_LINE_LEN 512
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int ntfs_log_handler_syslog(const char *function __attribute__((unused)),
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const char *file __attribute__((unused)),
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int line __attribute__((unused)), u32 level,
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void *data __attribute__((unused)),
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const char *format, va_list args)
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{
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char logbuf[LOG_LINE_LEN];
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int ret, olderr = errno;
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#ifndef DEBUG
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if ((level & NTFS_LOG_LEVEL_PERROR) && errno == ENOSPC)
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return 1;
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#endif
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ret = vsnprintf(logbuf, LOG_LINE_LEN, format, args);
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if (ret < 0) {
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vsyslog(LOG_NOTICE, format, args);
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ret = 1;
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goto out;
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}
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if ((LOG_LINE_LEN > ret + 3) && (level & NTFS_LOG_LEVEL_PERROR)) {
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strncat(logbuf, ": ", LOG_LINE_LEN - ret - 1);
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strncat(logbuf, strerror(olderr), LOG_LINE_LEN - (ret + 3));
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ret = strlen(logbuf);
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}
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syslog(LOG_NOTICE, "%s", logbuf);
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out:
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errno = olderr;
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return ret;
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}
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#endif
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/**
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* ntfs_log_handler_fprintf - Basic logging handler
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* @function: Function in which the log line occurred
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* @file: File in which the log line occurred
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* @line: Line number on which the log line occurred
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* @level: Level at which the line is logged
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* @data: User specified data, possibly specific to a handler
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* @format: printf-style formatting string
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* @args: Arguments to be formatted
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*
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* A simple logging handler. This is where the log line is finally displayed.
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* It is more likely that you will want to set the handler to either
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* ntfs_log_handler_outerr or ntfs_log_handler_stderr.
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*
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* Note: For this handler, @data is a pointer to a FILE output stream.
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* If @data is NULL, nothing will be displayed.
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*
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* Returns: -1 Error occurred
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* 0 Message wasn't logged
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* num Number of output characters
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*/
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int ntfs_log_handler_fprintf(const char *function, const char *file,
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int line, u32 level, void *data, const char *format, va_list args)
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{
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#ifdef DEBUG
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int i;
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#endif
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int ret = 0;
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int olderr = errno;
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FILE *stream;
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if (!data) /* Interpret data as a FILE stream. */
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return 0; /* If it's NULL, we can't do anything. */
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stream = (FILE*)data;
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#ifdef DEBUG
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if (level == NTFS_LOG_LEVEL_LEAVE) {
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if (tab)
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tab--;
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return 0;
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}
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for (i = 0; i < tab; i++)
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ret += fprintf(stream, " ");
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#endif
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if ((ntfs_log.flags & NTFS_LOG_FLAG_ONLYNAME) &&
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(strchr(file, PATH_SEP))) /* Abbreviate the filename */
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file = strrchr(file, PATH_SEP) + 1;
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if (ntfs_log.flags & NTFS_LOG_FLAG_PREFIX) /* Prefix the output */
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ret += fprintf(stream, "%s", ntfs_log_get_prefix(level));
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if (ntfs_log.flags & NTFS_LOG_FLAG_FILENAME) /* Source filename */
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ret += fprintf(stream, "%s ", file);
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if (ntfs_log.flags & NTFS_LOG_FLAG_LINE) /* Source line number */
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ret += fprintf(stream, "(%d) ", line);
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if ((ntfs_log.flags & NTFS_LOG_FLAG_FUNCTION) || /* Source function */
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(level & NTFS_LOG_LEVEL_TRACE) || (level & NTFS_LOG_LEVEL_ENTER))
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ret += fprintf(stream, "%s(): ", function);
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ret += vfprintf(stream, format, args);
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if (level & NTFS_LOG_LEVEL_PERROR)
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ret += fprintf(stream, ": %s\n", strerror(olderr));
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#ifdef DEBUG
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if (level == NTFS_LOG_LEVEL_ENTER)
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tab++;
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#endif
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fflush(stream);
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errno = olderr;
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return ret;
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}
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/**
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* ntfs_log_handler_null - Null logging handler (no output)
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* @function: Function in which the log line occurred
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* @file: File in which the log line occurred
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* @line: Line number on which the log line occurred
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* @level: Level at which the line is logged
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* @data: User specified data, possibly specific to a handler
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* @format: printf-style formatting string
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* @args: Arguments to be formatted
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*
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* This handler produces no output. It provides a way to temporarily disable
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* logging, without having to change the levels and flags.
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*
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* Returns: 0 Message wasn't logged
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*/
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int ntfs_log_handler_null(const char *function __attribute__((unused)), const char *file __attribute__((unused)),
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int line __attribute__((unused)), u32 level __attribute__((unused)), void *data __attribute__((unused)),
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const char *format __attribute__((unused)), va_list args __attribute__((unused)))
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{
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return 0;
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}
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/**
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* ntfs_log_handler_stdout - All logs go to stdout
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* @function: Function in which the log line occurred
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* @file: File in which the log line occurred
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* @line: Line number on which the log line occurred
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* @level: Level at which the line is logged
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* @data: User specified data, possibly specific to a handler
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* @format: printf-style formatting string
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* @args: Arguments to be formatted
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*
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* Display a log message to stdout.
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*
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* Note: For this handler, @data is a pointer to a FILE output stream.
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* If @data is NULL, then stdout will be used.
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*
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* Note: This function calls ntfs_log_handler_fprintf to do the main work.
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*
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* Returns: -1 Error occurred
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* 0 Message wasn't logged
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* num Number of output characters
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*/
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int ntfs_log_handler_stdout(const char *function, const char *file,
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int line, u32 level, void *data, const char *format, va_list args)
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{
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if (!data)
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data = stdout;
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return ntfs_log_handler_fprintf(function, file, line, level, data, format, args);
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}
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/**
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* ntfs_log_handler_outerr - Logs go to stdout/stderr depending on level
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* @function: Function in which the log line occurred
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* @file: File in which the log line occurred
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* @line: Line number on which the log line occurred
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* @level: Level at which the line is logged
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* @data: User specified data, possibly specific to a handler
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* @format: printf-style formatting string
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* @args: Arguments to be formatted
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*
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* Display a log message. The output stream will be determined by the log
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* level.
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*
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* Note: For this handler, @data is a pointer to a FILE output stream.
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* If @data is NULL, the function ntfs_log_get_stream will be called
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*
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* Note: This function calls ntfs_log_handler_fprintf to do the main work.
|
|
*
|
|
* Returns: -1 Error occurred
|
|
* 0 Message wasn't logged
|
|
* num Number of output characters
|
|
*/
|
|
int ntfs_log_handler_outerr(const char *function, const char *file,
|
|
int line, u32 level, void *data, const char *format, va_list args)
|
|
{
|
|
if (!data)
|
|
data = ntfs_log_get_stream(level);
|
|
|
|
return ntfs_log_handler_fprintf(function, file, line, level, data, format, args);
|
|
}
|
|
|
|
/**
|
|
* ntfs_log_handler_stderr - All logs go to stderr
|
|
* @function: Function in which the log line occurred
|
|
* @file: File in which the log line occurred
|
|
* @line: Line number on which the log line occurred
|
|
* @level: Level at which the line is logged
|
|
* @data: User specified data, possibly specific to a handler
|
|
* @format: printf-style formatting string
|
|
* @args: Arguments to be formatted
|
|
*
|
|
* Display a log message to stderr.
|
|
*
|
|
* Note: For this handler, @data is a pointer to a FILE output stream.
|
|
* If @data is NULL, then stdout will be used.
|
|
*
|
|
* Note: This function calls ntfs_log_handler_fprintf to do the main work.
|
|
*
|
|
* Returns: -1 Error occurred
|
|
* 0 Message wasn't logged
|
|
* num Number of output characters
|
|
*/
|
|
int ntfs_log_handler_stderr(const char *function, const char *file,
|
|
int line, u32 level, void *data, const char *format, va_list args)
|
|
{
|
|
if (!data)
|
|
data = stderr;
|
|
|
|
return ntfs_log_handler_fprintf(function, file, line, level, data, format, args);
|
|
}
|
|
|
|
|
|
/**
|
|
* ntfs_log_parse_option - Act upon command line options
|
|
* @option: Option flag
|
|
*
|
|
* Delegate some of the work of parsing the command line. All the options begin
|
|
* with "--log-". Options cause log levels to be enabled in @ntfs_log (the
|
|
* global logging structure).
|
|
*
|
|
* Note: The "colour" option changes the logging handler.
|
|
*
|
|
* Returns: TRUE Option understood
|
|
* FALSE Invalid log option
|
|
*/
|
|
BOOL ntfs_log_parse_option(const char *option)
|
|
{
|
|
if (strcmp(option, "--log-debug") == 0) {
|
|
ntfs_log_set_levels(NTFS_LOG_LEVEL_DEBUG);
|
|
return TRUE;
|
|
} else if (strcmp(option, "--log-verbose") == 0) {
|
|
ntfs_log_set_levels(NTFS_LOG_LEVEL_VERBOSE);
|
|
return TRUE;
|
|
} else if (strcmp(option, "--log-quiet") == 0) {
|
|
ntfs_log_clear_levels(NTFS_LOG_LEVEL_QUIET);
|
|
return TRUE;
|
|
} else if (strcmp(option, "--log-trace") == 0) {
|
|
ntfs_log_set_levels(NTFS_LOG_LEVEL_TRACE);
|
|
return TRUE;
|
|
}
|
|
|
|
ntfs_log_debug("Unknown logging option '%s'\n", option);
|
|
return FALSE;
|
|
}
|
|
|