1/*	$OpenBSD: log.c,v 1.10 2023/04/19 12:58:16 jsg 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 <sys/types.h>
20
21#include <arpa/inet.h>
22#include <errno.h>
23#include <netdb.h>
24#include <stdarg.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
28#include <syslog.h>
29#include <time.h>
30#include <unistd.h>
31
32#include "eigrpd.h"
33#include "log.h"
34
35int		 debug;
36int		 verbose;
37const char	*log_procname;
38
39void
40log_init(int n_debug)
41{
42	extern char	*__progname;
43
44	debug = n_debug;
45
46	if (!debug)
47		openlog(__progname, LOG_PID | LOG_NDELAY, LOG_DAEMON);
48
49	tzset();
50}
51
52void
53log_verbose(int v)
54{
55	verbose = v;
56}
57
58void
59logit(int pri, const char *fmt, ...)
60{
61	va_list	ap;
62
63	va_start(ap, fmt);
64	vlog(pri, fmt, ap);
65	va_end(ap);
66}
67
68void
69vlog(int pri, const char *fmt, va_list ap)
70{
71	char	*nfmt;
72
73	if (debug) {
74		/* best effort in out of mem situations */
75		if (asprintf(&nfmt, "%s\n", fmt) == -1) {
76			vfprintf(stderr, fmt, ap);
77			fprintf(stderr, "\n");
78		} else {
79			vfprintf(stderr, nfmt, ap);
80			free(nfmt);
81		}
82		fflush(stderr);
83	} else
84		vsyslog(pri, fmt, ap);
85}
86
87void
88log_warn(const char *emsg, ...)
89{
90	char	*nfmt;
91	va_list	 ap;
92
93	/* best effort to even work in out of memory situations */
94	if (emsg == NULL)
95		logit(LOG_ERR, "%s", strerror(errno));
96	else {
97		va_start(ap, emsg);
98
99		if (asprintf(&nfmt, "%s: %s", emsg, strerror(errno)) == -1) {
100			/* we tried it... */
101			vlog(LOG_ERR, emsg, ap);
102			logit(LOG_ERR, "%s", strerror(errno));
103		} else {
104			vlog(LOG_ERR, nfmt, ap);
105			free(nfmt);
106		}
107		va_end(ap);
108	}
109}
110
111void
112log_warnx(const char *emsg, ...)
113{
114	va_list	 ap;
115
116	va_start(ap, emsg);
117	vlog(LOG_ERR, emsg, ap);
118	va_end(ap);
119}
120
121void
122log_info(const char *emsg, ...)
123{
124	va_list	 ap;
125
126	va_start(ap, emsg);
127	vlog(LOG_INFO, emsg, ap);
128	va_end(ap);
129}
130
131void
132log_debug(const char *emsg, ...)
133{
134	va_list	 ap;
135
136	if (verbose) {
137		va_start(ap, emsg);
138		vlog(LOG_DEBUG, emsg, ap);
139		va_end(ap);
140	}
141}
142
143void
144fatal(const char *emsg)
145{
146	if (emsg == NULL)
147		logit(LOG_CRIT, "fatal in %s: %s", log_procname,
148		    strerror(errno));
149	else
150		if (errno)
151			logit(LOG_CRIT, "fatal in %s: %s: %s",
152			    log_procname, emsg, strerror(errno));
153		else
154			logit(LOG_CRIT, "fatal in %s: %s",
155			    log_procname, emsg);
156
157	exit(1);
158}
159
160void
161fatalx(const char *emsg)
162{
163	errno = 0;
164	fatal(emsg);
165}
166