1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2016 The DragonFly Project
5 * Copyright (c) 2012 The FreeBSD Foundation
6 * All rights reserved.
7 *
8 * This software was developed by Edward Tomasz Napierala under sponsorship
9 * from the FreeBSD Foundation.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33
34 #include <errno.h>
35 #include <stdarg.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <syslog.h>
40 #include <vis.h>
41
42 #include "common.h"
43
44 static int log_level = 0;
45 static char *peer_name = NULL;
46 static char *peer_addr = NULL;
47
48 #define MSGBUF_LEN 1024
49
50 void
log_init(int level)51 log_init(int level)
52 {
53
54 log_level = level;
55 openlog(getprogname(), LOG_NDELAY | LOG_PID, LOG_DAEMON);
56 }
57
58 void
log_set_peer_name(const char * name)59 log_set_peer_name(const char *name)
60 {
61
62 /*
63 * XXX: Turn it into assertion?
64 */
65 if (peer_name != NULL)
66 log_errx(1, "%s called twice", __func__);
67 if (peer_addr == NULL)
68 log_errx(1, "%s called before log_set_peer_addr", __func__);
69
70 peer_name = checked_strdup(name);
71 }
72
73 void
log_set_peer_addr(const char * addr)74 log_set_peer_addr(const char *addr)
75 {
76
77 /*
78 * XXX: Turn it into assertion?
79 */
80 if (peer_addr != NULL)
81 log_errx(1, "%s called twice", __func__);
82
83 peer_addr = checked_strdup(addr);
84 }
85
86 static void
log_common(int priority,int log_errno,const char * fmt,va_list ap)87 log_common(int priority, int log_errno, const char *fmt, va_list ap)
88 {
89 static char msgbuf[MSGBUF_LEN];
90 static char msgbuf_strvised[MSGBUF_LEN * 4 + 1];
91 char *errstr;
92 int ret;
93
94 ret = vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
95 if (ret < 0) {
96 fprintf(stderr, "%s: snprintf failed", getprogname());
97 syslog(LOG_CRIT, "snprintf failed");
98 exit(1);
99 }
100
101 ret = strnvis(msgbuf_strvised, msgbuf, sizeof(msgbuf_strvised), VIS_NL);
102 if (ret < 0) {
103 fprintf(stderr, "%s: strnvis failed", getprogname());
104 syslog(LOG_CRIT, "strnvis failed");
105 exit(1);
106 }
107
108 if (log_errno == -1) {
109 if (peer_name != NULL) {
110 fprintf(stderr, "%s: %s (%s): %s\n", getprogname(),
111 peer_addr, peer_name, msgbuf_strvised);
112 syslog(priority, "%s (%s): %s",
113 peer_addr, peer_name, msgbuf_strvised);
114 } else if (peer_addr != NULL) {
115 fprintf(stderr, "%s: %s: %s\n", getprogname(),
116 peer_addr, msgbuf_strvised);
117 syslog(priority, "%s: %s",
118 peer_addr, msgbuf_strvised);
119 } else {
120 fprintf(stderr, "%s: %s\n", getprogname(), msgbuf_strvised);
121 syslog(priority, "%s", msgbuf_strvised);
122 }
123
124 } else {
125 errstr = strerror(log_errno);
126
127 if (peer_name != NULL) {
128 fprintf(stderr, "%s: %s (%s): %s: %s\n", getprogname(),
129 peer_addr, peer_name, msgbuf_strvised, errstr);
130 syslog(priority, "%s (%s): %s: %s",
131 peer_addr, peer_name, msgbuf_strvised, errstr);
132 } else if (peer_addr != NULL) {
133 fprintf(stderr, "%s: %s: %s: %s\n", getprogname(),
134 peer_addr, msgbuf_strvised, errstr);
135 syslog(priority, "%s: %s: %s",
136 peer_addr, msgbuf_strvised, errstr);
137 } else {
138 fprintf(stderr, "%s: %s: %s\n", getprogname(),
139 msgbuf_strvised, errstr);
140 syslog(priority, "%s: %s",
141 msgbuf_strvised, errstr);
142 }
143 }
144 }
145
146 void
log_err(int eval,const char * fmt,...)147 log_err(int eval, const char *fmt, ...)
148 {
149 va_list ap;
150
151 va_start(ap, fmt);
152 log_common(LOG_CRIT, errno, fmt, ap);
153 va_end(ap);
154
155 exit(eval);
156 }
157
158 void
log_errx(int eval,const char * fmt,...)159 log_errx(int eval, const char *fmt, ...)
160 {
161 va_list ap;
162
163 va_start(ap, fmt);
164 log_common(LOG_CRIT, -1, fmt, ap);
165 va_end(ap);
166
167 exit(eval);
168 }
169
170 void
log_warn(const char * fmt,...)171 log_warn(const char *fmt, ...)
172 {
173 va_list ap;
174
175 va_start(ap, fmt);
176 log_common(LOG_WARNING, errno, fmt, ap);
177 va_end(ap);
178 }
179
180 void
log_warnx(const char * fmt,...)181 log_warnx(const char *fmt, ...)
182 {
183 va_list ap;
184
185 va_start(ap, fmt);
186 log_common(LOG_WARNING, -1, fmt, ap);
187 va_end(ap);
188 }
189
190 void
log_debugx(const char * fmt,...)191 log_debugx(const char *fmt, ...)
192 {
193 va_list ap;
194
195 if (log_level == 0)
196 return;
197
198 va_start(ap, fmt);
199 log_common(LOG_DEBUG, -1, fmt, ap);
200 va_end(ap);
201 }
202