1/*	$OpenBSD: log.c,v 1.1 2019/03/01 08:02:25 florian 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 <stdio.h>
20#include <stdlib.h>
21#include <stdarg.h>
22#include <string.h>
23#include <syslog.h>
24#include <errno.h>
25#include <time.h>
26
27#include "log.h"
28
29static int		 debug;
30static int		 verbose;
31static const char	*log_procname;
32
33void
34uw_log_init(int n_debug, int facility)
35{
36	extern char	*__progname;
37
38	debug = n_debug;
39	verbose = n_debug;
40	log_procinit(__progname);
41
42	if (!debug)
43		openlog(__progname, LOG_PID | LOG_NDELAY, facility);
44
45	tzset();
46}
47
48int
49log_getdebug(void)
50{
51	return (debug);
52}
53
54void
55log_procinit(const char *procname)
56{
57	if (procname != NULL)
58		log_procname = procname;
59}
60
61void
62log_setverbose(int v)
63{
64	verbose = v;
65}
66
67int
68log_getverbose(void)
69{
70	return (verbose);
71}
72
73void
74logit(int pri, const char *fmt, ...)
75{
76	va_list	ap;
77
78	va_start(ap, fmt);
79	vlog(pri, fmt, ap);
80	va_end(ap);
81}
82
83void
84vlog(int pri, const char *fmt, va_list ap)
85{
86	char	*nfmt;
87	int	 saved_errno = errno;
88
89	if (debug) {
90		/* best effort in out of mem situations */
91		if (asprintf(&nfmt, "%s\n", fmt) == -1) {
92			vfprintf(stderr, fmt, ap);
93			fprintf(stderr, "\n");
94		} else {
95			vfprintf(stderr, nfmt, ap);
96			free(nfmt);
97		}
98		fflush(stderr);
99	} else
100		vsyslog(pri, fmt, ap);
101
102	errno = saved_errno;
103}
104
105void
106uw_log_warn(const char *emsg, ...)
107{
108	char		*nfmt;
109	va_list		 ap;
110	int		 saved_errno = errno;
111
112	/* best effort to even work in out of memory situations */
113	if (emsg == NULL)
114		logit(LOG_ERR, "%s", strerror(saved_errno));
115	else {
116		va_start(ap, emsg);
117
118		if (asprintf(&nfmt, "%s: %s", emsg,
119		    strerror(saved_errno)) == -1) {
120			/* we tried it... */
121			vlog(LOG_ERR, emsg, ap);
122			logit(LOG_ERR, "%s", strerror(saved_errno));
123		} else {
124			vlog(LOG_ERR, nfmt, ap);
125			free(nfmt);
126		}
127		va_end(ap);
128	}
129
130	errno = saved_errno;
131}
132
133void
134log_warnx(const char *emsg, ...)
135{
136	va_list	 ap;
137
138	va_start(ap, emsg);
139	vlog(LOG_ERR, emsg, ap);
140	va_end(ap);
141}
142
143void
144uw_log_info(const char *emsg, ...)
145{
146	va_list	 ap;
147
148	va_start(ap, emsg);
149	vlog(LOG_INFO, emsg, ap);
150	va_end(ap);
151}
152
153void
154log_debug(const char *emsg, ...)
155{
156	va_list	 ap;
157
158	if (verbose) {
159		va_start(ap, emsg);
160		vlog(LOG_DEBUG, emsg, ap);
161		va_end(ap);
162	}
163}
164
165static void
166vfatalc(int code, const char *emsg, va_list ap)
167{
168	static char	s[BUFSIZ];
169	const char	*sep;
170
171	if (emsg != NULL) {
172		(void)vsnprintf(s, sizeof(s), emsg, ap);
173		sep = ": ";
174	} else {
175		s[0] = '\0';
176		sep = "";
177	}
178	if (code)
179		logit(LOG_CRIT, "fatal in %s: %s%s%s",
180		    log_procname, s, sep, strerror(code));
181	else
182		logit(LOG_CRIT, "fatal in %s%s%s", log_procname, sep, s);
183}
184
185void
186fatal(const char *emsg, ...)
187{
188	va_list	ap;
189
190	va_start(ap, emsg);
191	vfatalc(errno, emsg, ap);
192	va_end(ap);
193	exit(1);
194}
195
196void
197fatalx(const char *emsg, ...)
198{
199	va_list	ap;
200
201	va_start(ap, emsg);
202	vfatalc(0, emsg, ap);
203	va_end(ap);
204	exit(1);
205}
206