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/* $OpenBSD: log.c,v 1.12 2017/03/21 12:06:55 bluhm 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 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 <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <syslog.h>
#include <errno.h>
#include <time.h>
static int debug;
static int verbose;
const char *log_procname;
void log_init(int, int);
void log_procinit(const char *);
void log_setverbose(int);
int log_getverbose(void);
void log_warn(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_warnx(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_info(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_debug(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void logit(int, const char *, ...)
__attribute__((__format__ (printf, 2, 3)));
void vlog(int, const char *, va_list)
__attribute__((__format__ (printf, 2, 0)));
__dead void fatal(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
__dead void fatalx(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void
log_init(int n_debug, int facility)
{
extern char *__progname;
debug = n_debug;
verbose = n_debug;
log_procinit(__progname);
if (!debug)
openlog(__progname, LOG_PID | LOG_NDELAY, facility);
tzset();
}
void
log_procinit(const char *procname)
{
if (procname != NULL)
log_procname = procname;
}
void
log_setverbose(int v)
{
verbose = v;
}
int
log_getverbose(void)
{
return (verbose);
}
void
logit(int pri, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vlog(pri, fmt, ap);
va_end(ap);
}
void
vlog(int pri, const char *fmt, va_list ap)
{
char *nfmt;
int saved_errno = errno;
if (debug) {
/* best effort in out of mem situations */
if (asprintf(&nfmt, "%s\n", fmt) == -1) {
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
} else {
vfprintf(stderr, nfmt, ap);
free(nfmt);
}
fflush(stderr);
} else
vsyslog(pri, fmt, ap);
errno = saved_errno;
}
void
log_warn(const char *emsg, ...)
{
char *nfmt;
va_list ap;
int saved_errno = errno;
/* best effort to even work in out of memory situations */
if (emsg == NULL)
logit(LOG_ERR, "%s", strerror(saved_errno));
else {
va_start(ap, emsg);
if (asprintf(&nfmt, "%s: %s", emsg,
strerror(saved_errno)) == -1) {
/* we tried it... */
vlog(LOG_ERR, emsg, ap);
logit(LOG_ERR, "%s", strerror(saved_errno));
} else {
vlog(LOG_ERR, nfmt, ap);
free(nfmt);
}
va_end(ap);
}
errno = saved_errno;
}
void
log_warnx(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vlog(LOG_ERR, emsg, ap);
va_end(ap);
}
void
log_info(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vlog(LOG_INFO, emsg, ap);
va_end(ap);
}
void
log_debug(const char *emsg, ...)
{
va_list ap;
if (verbose > 1) {
va_start(ap, emsg);
vlog(LOG_DEBUG, emsg, ap);
va_end(ap);
}
}
static void
vfatalc(int code, const char *emsg, va_list ap)
{
static char s[BUFSIZ];
const char *sep;
if (emsg != NULL) {
(void)vsnprintf(s, sizeof(s), emsg, ap);
sep = ": ";
} else {
s[0] = '\0';
sep = "";
}
if (code)
logit(LOG_CRIT, "%s: %s%s%s",
log_procname, s, sep, strerror(code));
else
logit(LOG_CRIT, "%s%s%s", log_procname, sep, s);
}
void
fatal(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vfatalc(errno, emsg, ap);
va_end(ap);
exit(1);
}
void
fatalx(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vfatalc(0, emsg, ap);
va_end(ap);
exit(1);
}
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