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log.c
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log.c
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/**
* @author mads
* @email 86625902@qq.com
* @create date 2020-03-19 16:04:46
* @modify date 2020-03-19 16:04:46
* @desc proxy to system logger, import from openssh 2.9.9p2.
*/
#include "log.h"
#include "includes.h"
#include <syslog.h>
static LogLevel log_level = LOG_LEVEL_INFO;
static int log_on_stderr = 1;
static LogFacility log_facility = LOG_AUTHPRIV;
static char *argv0;
extern char *__progname;
static void do_log(LogLevel, const char *fmt, va_list);
/**
* Initialize logger.
*/
void
log_init(char *av0, LogLevel level, LogFacility facility, int on_stderr)
{
log_on_stderr = on_stderr;
argv0 = av0;
switch(level){
case LOG_LEVEL_ERR:
case LOG_LEVEL_WARNING:
case LOG_LEVEL_INFO:
case LOG_LEVEL_DEBUG:
log_level = level;
break;
default:
fprintf(stderr, "Unrecognized internal syslog level code %d\n", (int)level);
exit(1);
}
if(on_stderr) return;
switch(facility){
case LOG_FACILITY_AUTHPRIV:
log_facility = LOG_AUTHPRIV;
break;
case LOG_FACILITY_DAEMON:
log_facility = LOG_DAEMON;
break;
case LOG_FACILITY_USER:
log_facility = LOG_USER;
break;
default:
fprintf(stderr, "Unrecognized internal syslog facility code %d\n", (int)facility);
exit(1);
}
}
void
error(const char *fmt,...)
{
va_list args;
va_start(args, fmt);
do_log(LOG_LEVEL_ERR, fmt, args);
va_end(args);
exit(1);
}
void
info(const char *fmt,...)
{
va_list args;
va_start(args, fmt);
do_log(LOG_LEVEL_INFO, fmt, args);
va_end(args);
}
void
warn(const char *fmt,...)
{
va_list args;
va_start(args, fmt);
do_log(LOG_LEVEL_WARNING, fmt, args);
va_end(args);
}
void
debug(const char *fmt,...)
{
va_list args;
va_start(args, fmt);
do_log(LOG_LEVEL_DEBUG, fmt, args);
va_end(args);
}
static void
do_log(LogLevel level, const char *fmt, va_list args)
{
char msgbuf[1024];
char fmtbuf[1024];
char *txt = NULL;
char *color = NULL;
int pri = LOG_INFO;
/* Equals to setlogmask */
if (level > log_level){
return;
}
switch(level){
case LOG_LEVEL_ERR:
pri = LOG_ERR;
color = "\033[31m";
txt = "ERROR";
break;
case LOG_LEVEL_WARNING:
pri = LOG_WARNING;
color = "\033[33m";
txt = "WARN";
break;
case LOG_LEVEL_INFO:
pri = LOG_INFO;
color = "\033[34m";
txt = "INFO";
break;
case LOG_LEVEL_DEBUG:
pri = LOG_DEBUG;
color = "\033[32m";
txt = "DEBUG";
break;
default:
pri = LOG_ERR;
color = "\033[31m";
txt = "log internal error";
break;
}
if(log_on_stderr){
snprintf(fmtbuf, sizeof(fmtbuf), "%s%-5s\033[0m: %s", color, txt, fmt);
}else{
snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
}
vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
if(log_on_stderr){
fprintf(stderr, "%s\r\n", msgbuf);
}else{
openlog(argv0 ? argv0 : __progname, LOG_PID | LOG_PERROR, log_facility);
syslog(pri, "%.500s", msgbuf);
closelog();
}
}