xref: /freebsd/usr.sbin/autofs/log.c (revision fd45b686f9d92f583366c75b22c04c7ee49709c0)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2012 The FreeBSD Foundation
5  *
6  * This software was developed by Edward Tomasz Napierala under sponsorship
7  * from the FreeBSD Foundation.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  *
30  */
31 
32 #include <sys/cdefs.h>
33 #include <errno.h>
34 #include <stdarg.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <syslog.h>
39 #include <vis.h>
40 
41 #include "common.h"
42 
43 static int log_level = 0;
44 static char *peer_name = NULL;
45 static char *peer_addr = NULL;
46 
47 #define	MSGBUF_LEN	1024
48 
49 void
50 log_init(int level)
51 {
52 
53 	log_level = level;
54 	openlog(getprogname(), LOG_NDELAY | LOG_PID, LOG_DAEMON);
55 }
56 
57 void
58 log_set_peer_name(const char *name)
59 {
60 
61 	/*
62 	 * XXX: Turn it into assertion?
63 	 */
64 	if (peer_name != NULL)
65 		log_errx(1, "%s called twice", __func__);
66 	if (peer_addr == NULL)
67 		log_errx(1, "%s called before log_set_peer_addr", __func__);
68 
69 	peer_name = checked_strdup(name);
70 }
71 
72 void
73 log_set_peer_addr(const char *addr)
74 {
75 
76 	/*
77 	 * XXX: Turn it into assertion?
78 	 */
79 	if (peer_addr != NULL)
80 		log_errx(1, "%s called twice", __func__);
81 
82 	peer_addr = checked_strdup(addr);
83 }
84 
85 static void
86 log_common(int priority, int log_errno, const char *fmt, va_list ap)
87 {
88 	static char msgbuf[MSGBUF_LEN];
89 	static char msgbuf_strvised[MSGBUF_LEN * 4 + 1];
90 	char *errstr;
91 	int ret;
92 
93 	ret = vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
94 	if (ret < 0) {
95 		fprintf(stderr, "%s: snprintf failed", getprogname());
96 		syslog(LOG_CRIT, "snprintf failed");
97 		exit(1);
98 	}
99 
100 	ret = strnvis(msgbuf_strvised, sizeof(msgbuf_strvised), msgbuf, VIS_NL);
101 	if (ret < 0) {
102 		fprintf(stderr, "%s: strnvis failed", getprogname());
103 		syslog(LOG_CRIT, "strnvis failed");
104 		exit(1);
105 	}
106 
107 	if (log_errno == -1) {
108 		if (peer_name != NULL) {
109 			fprintf(stderr, "%s: %s (%s): %s\n", getprogname(),
110 			    peer_addr, peer_name, msgbuf_strvised);
111 			syslog(priority, "%s (%s): %s",
112 			    peer_addr, peer_name, msgbuf_strvised);
113 		} else if (peer_addr != NULL) {
114 			fprintf(stderr, "%s: %s: %s\n", getprogname(),
115 			    peer_addr, msgbuf_strvised);
116 			syslog(priority, "%s: %s",
117 			    peer_addr, msgbuf_strvised);
118 		} else {
119 			fprintf(stderr, "%s: %s\n", getprogname(), msgbuf_strvised);
120 			syslog(priority, "%s", msgbuf_strvised);
121 		}
122 
123 	} else {
124 		errstr = strerror(log_errno);
125 
126 		if (peer_name != NULL) {
127 			fprintf(stderr, "%s: %s (%s): %s: %s\n", getprogname(),
128 			    peer_addr, peer_name, msgbuf_strvised, errstr);
129 			syslog(priority, "%s (%s): %s: %s",
130 			    peer_addr, peer_name, msgbuf_strvised, errstr);
131 		} else if (peer_addr != NULL) {
132 			fprintf(stderr, "%s: %s: %s: %s\n", getprogname(),
133 			    peer_addr, msgbuf_strvised, errstr);
134 			syslog(priority, "%s: %s: %s",
135 			    peer_addr, msgbuf_strvised, errstr);
136 		} else {
137 			fprintf(stderr, "%s: %s: %s\n", getprogname(),
138 			    msgbuf_strvised, errstr);
139 			syslog(priority, "%s: %s",
140 			    msgbuf_strvised, errstr);
141 		}
142 	}
143 }
144 
145 void
146 log_err(int eval, const char *fmt, ...)
147 {
148 	va_list ap;
149 
150 	va_start(ap, fmt);
151 	log_common(LOG_CRIT, errno, fmt, ap);
152 	va_end(ap);
153 
154 	exit(eval);
155 }
156 
157 void
158 log_errx(int eval, const char *fmt, ...)
159 {
160 	va_list ap;
161 
162 	va_start(ap, fmt);
163 	log_common(LOG_CRIT, -1, fmt, ap);
164 	va_end(ap);
165 
166 	exit(eval);
167 }
168 
169 void
170 log_warn(const char *fmt, ...)
171 {
172 	va_list ap;
173 
174 	va_start(ap, fmt);
175 	log_common(LOG_WARNING, errno, fmt, ap);
176 	va_end(ap);
177 }
178 
179 void
180 log_warnx(const char *fmt, ...)
181 {
182 	va_list ap;
183 
184 	va_start(ap, fmt);
185 	log_common(LOG_WARNING, -1, fmt, ap);
186 	va_end(ap);
187 }
188 
189 void
190 log_debugx(const char *fmt, ...)
191 {
192 	va_list ap;
193 
194 	if (log_level == 0)
195 		return;
196 
197 	va_start(ap, fmt);
198 	log_common(LOG_DEBUG, -1, fmt, ap);
199 	va_end(ap);
200 }
201