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1 /*	$OpenBSD: err.c,v 1.2 2002/06/25 15:50:15 mickey Exp $	*/
2 
3 /*
4  * log.c
5  *
6  * Based on err.c, which was adapted from OpenBSD libc *err* *warn* code.
7  *
8  * Copyright (c) 2005 Nick Mathewson <nickm@freehaven.net>
9  *
10  * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
11  *
12  * Copyright (c) 1993
13  *	The Regents of the University of California.  All rights reserved.
14  *
15  * Redistribution and use in source and binary forms, with or without
16  * modification, are permitted provided that the following conditions
17  * are met:
18  * 1. Redistributions of source code must retain the above copyright
19  *    notice, this list of conditions and the following disclaimer.
20  * 2. Redistributions in binary form must reproduce the above copyright
21  *    notice, this list of conditions and the following disclaimer in the
22  *    documentation and/or other materials provided with the distribution.
23  * 3. Neither the name of the University nor the names of its contributors
24  *    may be used to endorse or promote products derived from this software
25  *    without specific prior written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37  * SUCH DAMAGE.
38  */
39 
40 #ifdef HAVE_CONFIG_H
41 #include "config.h"
42 #endif
43 
44 #ifdef WIN32
45 #define WIN32_LEAN_AND_MEAN
46 #include <windows.h>
47 #undef WIN32_LEAN_AND_MEAN
48 #endif
49 #include <sys/types.h>
50 #ifdef HAVE_SYS_TIME_H
51 #include <sys/time.h>
52 #else
53 #include <sys/_libevent_time.h>
54 #endif
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <stdarg.h>
58 #include <string.h>
59 #include <errno.h>
60 #include "event.h"
61 
62 #include "log.h"
63 #include "evutil.h"
64 
65 static void _warn_helper(int severity, int log_errno, const char *fmt,
66                          va_list ap);
67 static void event_log(int severity, const char *msg);
68 
69 void
event_err(int eval,const char * fmt,...)70 event_err(int eval, const char *fmt, ...)
71 {
72 	va_list ap;
73 
74 	va_start(ap, fmt);
75 	_warn_helper(_EVENT_LOG_ERR, errno, fmt, ap);
76 	va_end(ap);
77 	exit(eval);
78 }
79 
80 void
event_warn(const char * fmt,...)81 event_warn(const char *fmt, ...)
82 {
83 	va_list ap;
84 
85 	va_start(ap, fmt);
86 	_warn_helper(_EVENT_LOG_WARN, errno, fmt, ap);
87 	va_end(ap);
88 }
89 
90 void
event_errx(int eval,const char * fmt,...)91 event_errx(int eval, const char *fmt, ...)
92 {
93 	va_list ap;
94 
95 	va_start(ap, fmt);
96 	_warn_helper(_EVENT_LOG_ERR, -1, fmt, ap);
97 	va_end(ap);
98 	exit(eval);
99 }
100 
101 void
event_warnx(const char * fmt,...)102 event_warnx(const char *fmt, ...)
103 {
104 	va_list ap;
105 
106 	va_start(ap, fmt);
107 	_warn_helper(_EVENT_LOG_WARN, -1, fmt, ap);
108 	va_end(ap);
109 }
110 
111 void
event_msgx(const char * fmt,...)112 event_msgx(const char *fmt, ...)
113 {
114 	va_list ap;
115 
116 	va_start(ap, fmt);
117 	_warn_helper(_EVENT_LOG_MSG, -1, fmt, ap);
118 	va_end(ap);
119 }
120 
121 void
_event_debugx(const char * fmt,...)122 _event_debugx(const char *fmt, ...)
123 {
124 	va_list ap;
125 
126 	va_start(ap, fmt);
127 	_warn_helper(_EVENT_LOG_DEBUG, -1, fmt, ap);
128 	va_end(ap);
129 }
130 
131 static void
_warn_helper(int severity,int log_errno,const char * fmt,va_list ap)132 _warn_helper(int severity, int log_errno, const char *fmt, va_list ap)
133 {
134 	char buf[1024];
135 	size_t len;
136 
137 	if (fmt != NULL)
138 		evutil_vsnprintf(buf, sizeof(buf), fmt, ap);
139 	else
140 		buf[0] = '\0';
141 
142 	if (log_errno >= 0) {
143 		len = strlen(buf);
144 		if (len < sizeof(buf) - 3) {
145 			evutil_snprintf(buf + len, sizeof(buf) - len, ": %s",
146 			    strerror(log_errno));
147 		}
148 	}
149 
150 	event_log(severity, buf);
151 }
152 
153 static event_log_cb log_fn = NULL;
154 
155 void
event_set_log_callback(event_log_cb cb)156 event_set_log_callback(event_log_cb cb)
157 {
158 	log_fn = cb;
159 }
160 
161 static void
event_log(int severity,const char * msg)162 event_log(int severity, const char *msg)
163 {
164 	if (log_fn)
165 		log_fn(severity, msg);
166 	else {
167 		const char *severity_str;
168 		switch (severity) {
169 		case _EVENT_LOG_DEBUG:
170 			severity_str = "debug";
171 			break;
172 		case _EVENT_LOG_MSG:
173 			severity_str = "msg";
174 			break;
175 		case _EVENT_LOG_WARN:
176 			severity_str = "warn";
177 			break;
178 		case _EVENT_LOG_ERR:
179 			severity_str = "err";
180 			break;
181 		default:
182 			severity_str = "???";
183 			break;
184 		}
185 		(void)fprintf(stderr, "[%s] %s\n", severity_str, msg);
186 	}
187 }
188