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/* $OpenBSD: log.c,v 1.19 2019/07/03 05:04:19 otto Exp $ */
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/*
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* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <syslog.h>
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#include <errno.h>
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#include <time.h>
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#include "log.h"
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static int dest;
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static int verbose;
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const char *log_procname;
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void
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log_init(int n_dest, int n_verbose, int facility)
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{
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extern char *__progname;
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dest = n_dest;
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verbose = n_verbose;
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log_procinit(__progname);
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if (dest & LOG_TO_SYSLOG)
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openlog(__progname, LOG_PID | LOG_NDELAY, facility);
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tzset();
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}
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void
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log_procinit(const char *procname)
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{
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if (procname != NULL)
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log_procname = procname;
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}
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void
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log_setverbose(int v)
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{
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verbose = v;
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}
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int
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log_getverbose(void)
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{
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return (verbose);
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}
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void
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logit(int pri, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vlog(pri, fmt, ap);
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va_end(ap);
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}
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void
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vlog(int pri, const char *fmt, va_list ap)
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{
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char *nfmt;
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int saved_errno = errno;
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va_list ap2;
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va_copy(ap2, ap);
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if (dest & LOG_TO_STDERR) {
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/* best effort in out of mem situations */
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if (asprintf(&nfmt, "%s\n", fmt) == -1) {
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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} else {
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vfprintf(stderr, nfmt, ap);
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free(nfmt);
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}
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fflush(stderr);
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}
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if (dest & LOG_TO_SYSLOG)
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vsyslog(pri, fmt, ap2);
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va_end(ap2);
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errno = saved_errno;
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}
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void
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log_warn(const char *emsg, ...)
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{
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char *nfmt;
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va_list ap;
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int saved_errno = errno;
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/* best effort to even work in out of memory situations */
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if (emsg == NULL)
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logit(LOG_ERR, "%s", strerror(saved_errno));
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else {
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va_start(ap, emsg);
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if (asprintf(&nfmt, "%s: %s", emsg,
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strerror(saved_errno)) == -1) {
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/* we tried it... */
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vlog(LOG_ERR, emsg, ap);
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logit(LOG_ERR, "%s", strerror(saved_errno));
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} else {
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vlog(LOG_ERR, nfmt, ap);
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free(nfmt);
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}
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va_end(ap);
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}
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errno = saved_errno;
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}
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void
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log_warnx(const char *emsg, ...)
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{
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va_list ap;
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va_start(ap, emsg);
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vlog(LOG_ERR, emsg, ap);
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va_end(ap);
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}
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void
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log_info(const char *emsg, ...)
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{
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va_list ap;
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va_start(ap, emsg);
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vlog(LOG_INFO, emsg, ap);
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va_end(ap);
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}
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void
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log_debug(const char *emsg, ...)
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{
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va_list ap;
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if (verbose > 1) {
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va_start(ap, emsg);
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vlog(LOG_DEBUG, emsg, ap);
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va_end(ap);
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}
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}
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static void
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vfatalc(int code, const char *emsg, va_list ap)
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{
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static char s[BUFSIZ];
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const char *sep;
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if (emsg != NULL) {
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(void)vsnprintf(s, sizeof(s), emsg, ap);
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sep = ": ";
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} else {
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s[0] = '\0';
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sep = "";
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}
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if (code)
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logit(LOG_CRIT, "%s: %s%s%s",
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log_procname, s, sep, strerror(code));
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else
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logit(LOG_CRIT, "%s%s%s", log_procname, sep, s);
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}
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void
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fatal(const char *emsg, ...)
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{
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va_list ap;
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va_start(ap, emsg);
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vfatalc(errno, emsg, ap);
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va_end(ap);
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exit(1);
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}
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void
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fatalx(const char *emsg, ...)
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{
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va_list ap;
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va_start(ap, emsg);
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vfatalc(0, emsg, ap);
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va_end(ap);
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exit(1);
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}
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