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/*
* Copyright (C) 2009 Red Hat Inc.
*
* This application 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; version 2.
*
* This application 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.
*/
/**
* @file log.c
* @author David Sommerseth <davids@redhat.com>
* @date Wed Oct 21 11:38:51 2009
*
* @brief Generic log functions
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <stdarg.h>
#include <pthread.h>
#include <syslog.h>
#include <eurephia_nullsafe.h>
#include <log.h>
/**
* Maps defined log level strings into syslog
* compatible LOG_* integer values
*/
static struct {
const char *priority_str;
const int prio_level;
} syslog_prio_map[] = {
{"emerg", LOG_EMERG},
{"emergency", LOG_EMERG},
{"alert", LOG_ALERT},
{"crit", LOG_CRIT},
{"critical", LOG_CRIT},
{"err", LOG_ERR},
{"error", LOG_ERR},
{"warning", LOG_WARNING},
{"warn", LOG_WARNING},
{"notice", LOG_NOTICE},
{"info", LOG_INFO},
{"debug", LOG_DEBUG},
{NULL, 0}
};
/**
* Initialises a log context. It parses the log destination and log level and
* prepares a context which can be used by writelog()
*
* @param logdest String containing either syslog:[facility], stderr: or stdout:, or a file name.
* @param loglvl Defines the log level. Can be one of the values defined in syslog_prio_map.
*
* @return Returns a pointer to a log context on success, otherwise NULL.
*/
LogContext *init_log(const char *logdest, const char *loglvl) {
LogContext *logctx = NULL;
int i;
logctx = (LogContext *) calloc(1, sizeof(LogContext)+2);
assert( logctx != NULL);
logctx->logfp = NULL;
// Get the int value of the log level string
logctx->verbosity = -1;
if( loglvl ) {
for( i = 0; syslog_prio_map[i].priority_str; i++ ) {
if( strcasecmp(loglvl, syslog_prio_map[i].priority_str) == 0 ) {
logctx->verbosity = syslog_prio_map[i].prio_level;
break;
}
}
}
// If log level is not set, set LOG_INFo as default
if( logctx->verbosity == -1 ) {
logctx->verbosity = LOG_INFO;
}
if( logdest == NULL ) {
logctx->logtype = ltSYSLOG;
openlog("rteval-parserd", LOG_PID, LOG_DAEMON);
} else {
if( strncmp(logdest, "syslog:", 7) == 0 ) {
const char *fac = logdest+7;
int facid = LOG_DAEMON;
if( strcasecmp(fac, "local0") == 0 ) {
facid = LOG_LOCAL0;
} else if( strcasecmp(fac, "local1") == 0 ) {
facid = LOG_LOCAL1;
} else if( strcasecmp(fac, "local2") == 0 ) {
facid = LOG_LOCAL2;
} else if( strcasecmp(fac, "local3") == 0 ) {
facid = LOG_LOCAL3;
} else if( strcasecmp(fac, "local4") == 0 ) {
facid = LOG_LOCAL4;
} else if( strcasecmp(fac, "local5") == 0 ) {
facid = LOG_LOCAL5;
} else if( strcasecmp(fac, "local6") == 0 ) {
facid = LOG_LOCAL6;
} else if( strcasecmp(fac, "local7") == 0 ) {
facid = LOG_LOCAL7;
} else if( strcasecmp(fac, "user") == 0 ) {
facid = LOG_USER;
}
logctx->logtype = ltSYSLOG;
openlog("rteval-parserd", LOG_PID, facid);
} else if( strcmp(logdest, "stderr:") == 0 ) {
logctx->logtype = ltCONSOLE;
logctx->logfp = stderr;
} else if( strcmp(logdest, "stdout:") == 0 ) {
logctx->logtype = ltCONSOLE;
logctx->logfp = stdout;
} else {
logctx->logtype = ltFILE;
logctx->logfp = fopen(logdest, "a");
if( logctx->logfp == NULL ) {
fprintf(stderr, "** ERROR ** Failed to open log file %s: %s\n",
logdest, strerror(errno));
free_nullsafe(logctx);
return NULL;
}
}
}
if( logctx->logtype != ltSYSLOG ) {
static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
logctx->mtx_log = &mtx;
}
return logctx;
}
/**
* Tears down a log context. Closes log files and releases memory used by the log context.
*
* @param lctx Log context to close
*/
void close_log(LogContext *lctx) {
if( !lctx ) {
return;
}
switch( lctx->logtype ) {
case ltFILE:
fclose(lctx->logfp);
break;
case ltSYSLOG:
closelog();
break;
case ltCONSOLE:
break;
}
free_nullsafe(lctx);
}
/**
* Write data to the log.
*
* @param lctx Log context, where the data will be logged
* @param loglvl Log level. See the priorities for syslog(3) for valid values.
* @param fmt Data to be logged (stdarg)
*/
void writelog(LogContext *lctx, unsigned int loglvl, const char *fmt, ... ) {
if( !lctx || !fmt ) {
return;
}
if( lctx->verbosity >= loglvl ) {
va_list ap;
va_start(ap, fmt);
switch( lctx->logtype ) {
case ltSYSLOG:
vsyslog(loglvl, fmt, ap);
break;
case ltCONSOLE:
case ltFILE:
pthread_mutex_lock(lctx->mtx_log);
switch( loglvl ) {
case LOG_EMERG:
fprintf(lctx->logfp, "** EMERG ERROR ** ");
break;
case LOG_ALERT:
fprintf(lctx->logfp, "** ALERT ERROR ** ");
break;
case LOG_CRIT:
fprintf(lctx->logfp, "** CRITICAL ERROR ** ");
break;
case LOG_ERR:
fprintf(lctx->logfp, "** ERROR ** ");
break;
case LOG_WARNING:
fprintf(lctx->logfp, "*WARNING* ");
break;
case LOG_NOTICE:
fprintf(lctx->logfp, "[NOTICE] ");
break;
case LOG_INFO:
fprintf(lctx->logfp, "[INFO] ");
break;
case LOG_DEBUG:
fprintf(lctx->logfp, "[DEBUG] ");
break;
}
vfprintf(lctx->logfp, fmt, ap);
fprintf(lctx->logfp, "\n");
pthread_mutex_unlock(lctx->mtx_log);
if( lctx->logtype == ltFILE ) {
fflush(lctx->logfp);
}
break;
}
va_end(ap);
}
}
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