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/*
* This file is part of the Distributed Network Block Device 3
*
* Copyright(c) 2011-2012 Simon Rettberg
*
* This file may be licensed under the terms of of the
* GNU General Public License Version 2 (the ``GPL'').
*
* Software distributed under the License is distributed
* on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
* express or implied. See the GPL for the specific language
* governing rights and limitations.
*
* You should have received a copy of the GPL along with this
* program. If not, go to http://www.gnu.org/licenses/gpl.html
* or write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "log.h"
#include <stdarg.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#define LINE_LEN (800)
static pthread_mutex_t logLock = PTHREAD_MUTEX_INITIALIZER;
static logmask_t maskFile = 31;
static logmask_t maskCon = 15;
static char *logFile = NULL;
static int logFd = -1;
static bool consoleTimestamps = false;
static int writeLevel(char *buffer, logmask_t level);
bool log_hasMask(const logmask_t mask)
{
return ( ( maskFile | maskCon ) & mask ) == mask;
}
void log_setFileMask(logmask_t mask)
{
maskFile = mask;
}
void log_setConsoleMask(logmask_t mask)
{
maskCon = mask;
}
void log_setConsoleTimestamps(bool on)
{
consoleTimestamps = on;
}
bool log_openLogFile(const char *path)
{
pthread_mutex_lock( &logLock );
if ( logFd >= 0 ) {
close( logFd );
}
if ( path == NULL && logFile == NULL )
goto unlock;
if ( path != NULL ) {
free( logFile );
logFile = strdup( path );
}
logFd = open( logFile, O_WRONLY | O_CREAT | O_APPEND, 0644 );
if ( logFd < 0 )
goto unlock;
unlock: ;
pthread_mutex_unlock( &logLock );
return logFd >= 0;
}
void logadd(const logmask_t mask, const char *fmt, ...)
{
if ( ( (maskFile | maskCon) & mask ) == 0 )
return;
va_list ap;
int ret;
time_t rawtime;
struct tm timeinfo;
char buffer[LINE_LEN];
bool toFile = maskFile & mask;
bool toStdout = maskCon & mask;
size_t offset;
if ( toFile || ( toStdout && consoleTimestamps ) ) {
time( &rawtime );
localtime_r( &rawtime, &timeinfo );
offset = strftime( buffer, LINE_LEN, "[%d.%m. %H:%M:%S] ", &timeinfo );
} else {
offset = 0;
}
const char *stdoutLine = buffer + offset;
offset += writeLevel( buffer + offset, mask );
va_start( ap, fmt );
ret = vsnprintf( buffer + offset, LINE_LEN - offset, fmt, ap );
va_end( ap );
if ( ret < 0 ) return;
offset += ret;
if ( offset + 1 >= LINE_LEN ) {
buffer[LINE_LEN-2] = '\0';
offset = LINE_LEN - 2;
}
if ( buffer[offset-1] != '\n' ) {
buffer[offset++] = '\n';
buffer[offset] = '\0';
}
if ( toFile ) {
pthread_mutex_lock( &logLock );
if ( logFd >= 0 ) {
size_t done = 0;
while (done < offset ) {
const ssize_t wr = write( logFd, buffer + done, offset - done );
if ( wr < 0 ) {
if ( errno == EINTR ) continue;
printf( "Logging to file failed! (errno=%d)\n", errno );
break;
}
done += (size_t)wr;
}
}
pthread_mutex_unlock( &logLock );
}
if ( toStdout ) {
if ( consoleTimestamps ) stdoutLine = buffer;
#ifdef AFL_MODE
fputs( stdoutLine, stderr );
fflush( stderr );
#else
fputs( stdoutLine, stdout );
fflush( stdout );
#endif
}
}
ssize_t log_fetch(char *buffer, int size)
{
if ( logFile == NULL || size <= 1 )
return -1;
int fd = open( logFile, O_RDONLY );
if ( fd < 0 )
return -1;
off_t off = lseek( fd, 0, SEEK_END );
if ( off == (off_t)-1 ) {
close( fd );
return -1;
}
if ( (off_t)size <= off ) {
off -= size;
} else {
off = 0;
}
ssize_t ret = pread( fd, buffer, size - 1, off );
close( fd );
buffer[ret] = '\0';
return ret;
}
static int writeLevel(char *buffer, logmask_t level)
{
const char *word;
char *dest = buffer;
switch ( level ) {
case LOG_ERROR:
word = "ERROR";
break;
case LOG_WARNING:
word = "WARNING";
break;
case LOG_MINOR:
word = "Warning";
break;
case LOG_INFO:
word = "Info";
break;
case LOG_DEBUG1:
word = "DEBUG1";
break;
case LOG_DEBUG2:
word = "DEBUG2";
break;
default:
word = "!?!?!?";
break;
}
while ( ( *dest++ = *word++ ) );
*--dest = ':';
*++dest = ' ';
return (int)( dest - buffer ) + 1;
}
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