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log.c

/* $Id: log.c,v 1.7 2007/03/22 18:56:20 nicm Exp $ */
/*      $OpenBSD: log.c,v 1.6 2004/07/12 09:22:38 dtucker Exp $ */

/*
 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

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

#include "fdm.h"

int   debug;

void  logit(int, const char *, ...);

void
log_init(int n_debug)
{
      debug = n_debug;

      if (!debug)
            openlog(__progname, LOG_PID | LOG_NDELAY, LOG_MAIL);

      tzset();
}

void printflike2
logit(int pri, const char *fmt, ...)
{
      va_list     ap;

      va_start(ap, fmt);
      vlog(stderr, pri, fmt, ap);
      va_end(ap);
}

void
vlog(FILE *f, int pri, const char *fmt, va_list ap)
{
      char  *nfmt;

      if (debug) {
            /* best effort in out of mem situations */
            if (asprintf(&nfmt, "%s\n", fmt) == -1) {
                  vfprintf(f, fmt, ap);
                  fprintf(f, "\n");
            } else {
                  vfprintf(f, nfmt, ap);
                  free(nfmt);
            }
            fflush(f);
      } else
            vsyslog(pri, fmt, ap);
}


void printflike1
log_warn(const char *emsg, ...)
{
      char  *nfmt;
      va_list      ap;

      /* best effort to even work in out of memory situations */
      if (emsg == NULL)
            logit(LOG_CRIT, "%s", strerror(errno));
      else {
            va_start(ap, emsg);

            if (asprintf(&nfmt, "%s: %s", emsg, strerror(errno)) == -1) {
                  /* we tried it... */
                  vlog(stderr, LOG_CRIT, emsg, ap);
                  logit(LOG_CRIT, "%s", strerror(errno));
            } else {
                  vlog(stderr, LOG_CRIT, nfmt, ap);
                  free(nfmt);
            }
            va_end(ap);
      }
}

void printflike1
log_warnx(const char *emsg, ...)
{
      va_list     ap;

      va_start(ap, emsg);
      vlog(stderr, LOG_CRIT, emsg, ap);
      va_end(ap);
}

void printflike1
log_info(const char *emsg, ...)
{
      va_list     ap;

      if (conf.quiet)
            return;

      va_start(ap, emsg);
      vlog(stdout, LOG_INFO, emsg, ap);
      va_end(ap);
}

void printflike1
log_debug(const char *emsg, ...)
{
      va_list     ap;

      if (conf.debug > 0) {
            va_start(ap, emsg);
            vlog(stderr, LOG_DEBUG, emsg, ap);
            va_end(ap);
      }
}

void printflike1
log_debug2(const char *emsg, ...)
{
      va_list     ap;

      if (conf.debug > 1) {
            va_start(ap, emsg);
            vlog(stderr, LOG_DEBUG, emsg, ap);
            va_end(ap);
      }
}

void printflike1
log_debug3(const char *emsg, ...)
{
      va_list     ap;

      if (conf.debug > 2) {
            va_start(ap, emsg);
            vlog(stderr, LOG_DEBUG, emsg, ap);
            va_end(ap);
      }
}

__dead void
fatal(const char *emsg)
{
      if (emsg == NULL)
            logit(LOG_CRIT, "fatal: %s", strerror(errno));
      else
            if (errno)
                  logit(LOG_CRIT, "fatal: %s: %s", emsg, strerror(errno));
            else
                  logit(LOG_CRIT, "fatal: %s", emsg);

      exit(1);
}

__dead void
fatalx(const char *emsg)
{
      errno = 0;
      fatal(emsg);
}

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