1/*	$OpenBSD: log.c,v 1.10 2017/04/06 12:20:48 gsoares Exp $ */
2
3/*
4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <errno.h>
20#include <stdarg.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24#include <syslog.h>
25#include <time.h>
26
27#include "log.h"
28
29int		 debug;
30int		 verbose;
31const char	*log_procname;
32
33void
34log_init(int n_debug)
35{
36	extern char	*__progname;
37
38	debug = n_debug;
39
40	if (!debug)
41		openlog(__progname, LOG_PID | LOG_NDELAY, LOG_DAEMON);
42
43	tzset();
44}
45
46void
47log_verbose(int v)
48{
49	verbose = v;
50}
51
52void
53logit(int pri, const char *fmt, ...)
54{
55	va_list	ap;
56
57	va_start(ap, fmt);
58	vlog(pri, fmt, ap);
59	va_end(ap);
60}
61
62void
63vlog(int pri, const char *fmt, va_list ap)
64{
65	char	*nfmt;
66
67	if (debug) {
68		/* best effort in out of mem situations */
69		if (asprintf(&nfmt, "%s\n", fmt) == -1) {
70			vfprintf(stderr, fmt, ap);
71			fprintf(stderr, "\n");
72		} else {
73			vfprintf(stderr, nfmt, ap);
74			free(nfmt);
75		}
76		fflush(stderr);
77	} else
78		vsyslog(pri, fmt, ap);
79}
80
81void
82log_warn(const char *emsg, ...)
83{
84	char	*nfmt;
85	va_list	 ap;
86
87	/* best effort to even work in out of memory situations */
88	if (emsg == NULL)
89		logit(LOG_ERR, "%s", strerror(errno));
90	else {
91		va_start(ap, emsg);
92
93		if (asprintf(&nfmt, "%s: %s", emsg, strerror(errno)) == -1) {
94			/* we tried it... */
95			vlog(LOG_ERR, emsg, ap);
96			logit(LOG_ERR, "%s", strerror(errno));
97		} else {
98			vlog(LOG_ERR, nfmt, ap);
99			free(nfmt);
100		}
101		va_end(ap);
102	}
103}
104
105void
106log_warnx(const char *emsg, ...)
107{
108	va_list	 ap;
109
110	va_start(ap, emsg);
111	vlog(LOG_ERR, emsg, ap);
112	va_end(ap);
113}
114
115void
116log_info(const char *emsg, ...)
117{
118	va_list	 ap;
119
120	va_start(ap, emsg);
121	vlog(LOG_INFO, emsg, ap);
122	va_end(ap);
123}
124
125void
126log_debug(const char *emsg, ...)
127{
128	va_list	 ap;
129
130	if (verbose) {
131		va_start(ap, emsg);
132		vlog(LOG_DEBUG, emsg, ap);
133		va_end(ap);
134	}
135}
136
137void
138fatal(const char *emsg, ...)
139{
140	char	 s[1024];
141	va_list	 ap;
142
143	va_start(ap, emsg);
144	vsnprintf(s, sizeof(s), emsg, ap);
145	va_end(ap);
146
147	if (emsg == NULL)
148		logit(LOG_CRIT, "fatal in %s: %s", log_procname,
149		    strerror(errno));
150	else
151		if (errno)
152			logit(LOG_CRIT, "fatal in %s: %s: %s",
153			    log_procname, s, strerror(errno));
154		else
155			logit(LOG_CRIT, "fatal in %s: %s",
156			    log_procname, s);
157
158	exit(1);
159}
160
161void
162fatalx(const char *emsg)
163{
164	errno = 0;
165	fatal("%s", emsg);
166}
167