/*      $NetBSD: log.c,v 1.3 2018/01/13 12:36:35 christos Exp $ */

/*-
* Copyright (c) 2017 The NetBSD Foundation, Inc.
* Copyright (c) 2016 The DragonFly Project
* Copyright (c) 2012 The FreeBSD Foundation
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Tomohiro Kusumi <[email protected]>.
*
* This software was developed by Edward Tomasz Napierala under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: log.c,v 1.3 2018/01/13 12:36:35 christos Exp $");

#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <vis.h>

#include "common.h"

static int log_level = 0;
static char *peer_name = NULL;
static char *peer_addr = NULL;

#define MSGBUF_LEN      1024

void
log_init(int level)
{

       log_level = level;
       openlog(getprogname(), LOG_NDELAY | LOG_PID, LOG_DAEMON);
}

void
log_set_peer_name(const char *name)
{

       /*
        * XXX: Turn it into assertion?
        */
       if (peer_name != NULL)
               log_errx(1, "%s called twice", __func__);
       if (peer_addr == NULL)
               log_errx(1, "%s called before log_set_peer_addr", __func__);

       peer_name = checked_strdup(name);
}

void
log_set_peer_addr(const char *addr)
{

       /*
        * XXX: Turn it into assertion?
        */
       if (peer_addr != NULL)
               log_errx(1, "%s called twice", __func__);

       peer_addr = checked_strdup(addr);
}

static __printflike(3, 0) void
log_common(int priority, int log_errno, const char *fmt, va_list ap)
{
       static char msgbuf[MSGBUF_LEN];
       static char msgbuf_strvised[MSGBUF_LEN * 4 + 1];
       char *errstr;
       int ret;

       ret = vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
       if (ret < 0) {
               fprintf(stderr, "%s: snprintf failed", getprogname());
               syslog(LOG_CRIT, "snprintf failed");
               exit(EXIT_FAILURE);
       }

       ret = strnvis(msgbuf_strvised, sizeof(msgbuf_strvised), msgbuf, VIS_NL);
       if (ret < 0) {
               fprintf(stderr, "%s: strnvis failed", getprogname());
               syslog(LOG_CRIT, "strnvis failed");
               exit(EXIT_FAILURE);
       }

       if (log_errno == -1) {
               if (peer_name != NULL) {
                       fprintf(stderr, "%s: %s (%s): %s\n", getprogname(),
                           peer_addr, peer_name, msgbuf_strvised);
                       syslog(priority, "%s (%s): %s",
                           peer_addr, peer_name, msgbuf_strvised);
               } else if (peer_addr != NULL) {
                       fprintf(stderr, "%s: %s: %s\n", getprogname(),
                           peer_addr, msgbuf_strvised);
                       syslog(priority, "%s: %s",
                           peer_addr, msgbuf_strvised);
               } else {
                       fprintf(stderr, "%s: %s\n", getprogname(),
                           msgbuf_strvised);
                       syslog(priority, "%s", msgbuf_strvised);
               }

       } else {
               errstr = strerror(log_errno);

               if (peer_name != NULL) {
                       fprintf(stderr, "%s: %s (%s): %s: %s\n", getprogname(),
                           peer_addr, peer_name, msgbuf_strvised, errstr);
                       syslog(priority, "%s (%s): %s: %s",
                           peer_addr, peer_name, msgbuf_strvised, errstr);
               } else if (peer_addr != NULL) {
                       fprintf(stderr, "%s: %s: %s: %s\n", getprogname(),
                           peer_addr, msgbuf_strvised, errstr);
                       syslog(priority, "%s: %s: %s",
                           peer_addr, msgbuf_strvised, errstr);
               } else {
                       fprintf(stderr, "%s: %s: %s\n", getprogname(),
                           msgbuf_strvised, errstr);
                       syslog(priority, "%s: %s",
                           msgbuf_strvised, errstr);
               }
       }
}

__dead void
log_err(int eval, const char *fmt, ...)
{
       va_list ap;

       va_start(ap, fmt);
       log_common(LOG_CRIT, errno, fmt, ap);
       va_end(ap);

       exit(eval);
}

__dead void
log_errx(int eval, const char *fmt, ...)
{
       va_list ap;

       va_start(ap, fmt);
       log_common(LOG_CRIT, -1, fmt, ap);
       va_end(ap);

       exit(eval);
}

void
log_warn(const char *fmt, ...)
{
       va_list ap;

       va_start(ap, fmt);
       log_common(LOG_WARNING, errno, fmt, ap);
       va_end(ap);
}

void
log_warnx(const char *fmt, ...)
{
       va_list ap;

       va_start(ap, fmt);
       log_common(LOG_WARNING, -1, fmt, ap);
       va_end(ap);
}

void
log_debugx(const char *fmt, ...)
{
       va_list ap;

       if (log_level == 0)
               return;

       va_start(ap, fmt);
       log_common(LOG_DEBUG, -1, fmt, ap);
       va_end(ap);
}

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