1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2012 The FreeBSD Foundation
5 * All rights reserved.
6 *
7 * This software was developed by Edward Tomasz Napierala under sponsorship
8 * from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
36#include <errno.h>
37#include <stdarg.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <syslog.h>
42#include <vis.h>
43
44#include "iscsid.h"
45
46static int log_level = 0;
47static char *peer_name = NULL;
48static char *peer_addr = NULL;
49
50#define	MSGBUF_LEN	1024
51
52void
53log_init(int level)
54{
55
56	log_level = level;
57	openlog(getprogname(), LOG_NDELAY | LOG_PID, LOG_DAEMON);
58}
59
60void
61log_set_peer_name(const char *name)
62{
63
64	/*
65	 * XXX: Turn it into assertion?
66	 */
67	if (peer_name != NULL)
68		log_errx(1, "%s called twice", __func__);
69	if (peer_addr == NULL)
70		log_errx(1, "%s called before log_set_peer_addr", __func__);
71
72	peer_name = checked_strdup(name);
73}
74
75void
76log_set_peer_addr(const char *addr)
77{
78
79	/*
80	 * XXX: Turn it into assertion?
81	 */
82	if (peer_addr != NULL)
83		log_errx(1, "%s called twice", __func__);
84
85	peer_addr = checked_strdup(addr);
86}
87
88static void
89log_common(int priority, int log_errno, const char *fmt, va_list ap)
90{
91	static char msgbuf[MSGBUF_LEN];
92	static char msgbuf_strvised[MSGBUF_LEN * 4 + 1];
93	char *errstr;
94	int ret;
95
96	ret = vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
97	if (ret < 0) {
98		fprintf(stderr, "%s: snprintf failed", getprogname());
99		syslog(LOG_CRIT, "snprintf failed");
100		exit(1);
101	}
102
103	ret = strnvis(msgbuf_strvised, sizeof(msgbuf_strvised), msgbuf, VIS_NL);
104	if (ret < 0) {
105		fprintf(stderr, "%s: strnvis failed", getprogname());
106		syslog(LOG_CRIT, "strnvis failed");
107		exit(1);
108	}
109
110	if (log_errno == -1) {
111		if (peer_name != NULL) {
112			fprintf(stderr, "%s: %s (%s): %s\n", getprogname(),
113			    peer_addr, peer_name, msgbuf_strvised);
114			syslog(priority, "%s (%s): %s",
115			    peer_addr, peer_name, msgbuf_strvised);
116		} else if (peer_addr != NULL) {
117			fprintf(stderr, "%s: %s: %s\n", getprogname(),
118			    peer_addr, msgbuf_strvised);
119			syslog(priority, "%s: %s",
120			    peer_addr, msgbuf_strvised);
121		} else {
122			fprintf(stderr, "%s: %s\n", getprogname(), msgbuf_strvised);
123			syslog(priority, "%s", msgbuf_strvised);
124		}
125
126	} else {
127		errstr = strerror(log_errno);
128
129		if (peer_name != NULL) {
130			fprintf(stderr, "%s: %s (%s): %s: %s\n", getprogname(),
131			    peer_addr, peer_name, msgbuf_strvised, errstr);
132			syslog(priority, "%s (%s): %s: %s",
133			    peer_addr, peer_name, msgbuf_strvised, errstr);
134		} else if (peer_addr != NULL) {
135			fprintf(stderr, "%s: %s: %s: %s\n", getprogname(),
136			    peer_addr, msgbuf_strvised, errstr);
137			syslog(priority, "%s: %s: %s",
138			    peer_addr, msgbuf_strvised, errstr);
139		} else {
140			fprintf(stderr, "%s: %s: %s\n", getprogname(),
141			    msgbuf_strvised, errstr);
142			syslog(priority, "%s: %s",
143			    msgbuf_strvised, errstr);
144		}
145	}
146}
147
148void
149log_err(int eval, const char *fmt, ...)
150{
151	va_list ap;
152
153	va_start(ap, fmt);
154	log_common(LOG_CRIT, errno, fmt, ap);
155	va_end(ap);
156
157	exit(eval);
158}
159
160void
161log_errx(int eval, const char *fmt, ...)
162{
163	va_list ap;
164
165	va_start(ap, fmt);
166	log_common(LOG_CRIT, -1, fmt, ap);
167	va_end(ap);
168
169	exit(eval);
170}
171
172void
173log_warn(const char *fmt, ...)
174{
175	va_list ap;
176
177	va_start(ap, fmt);
178	log_common(LOG_WARNING, errno, fmt, ap);
179	va_end(ap);
180}
181
182void
183log_warnx(const char *fmt, ...)
184{
185	va_list ap;
186
187	va_start(ap, fmt);
188	log_common(LOG_WARNING, -1, fmt, ap);
189	va_end(ap);
190}
191
192void
193log_debugx(const char *fmt, ...)
194{
195	va_list ap;
196
197	if (log_level == 0)
198		return;
199
200	va_start(ap, fmt);
201	log_common(LOG_DEBUG, -1, fmt, ap);
202	va_end(ap);
203}
204