log.c revision 1.6 
1/*	$NetBSD: log.c,v 1.6 2021/04/07 03:36:48 christos Exp $	*/
2/*	$OpenBSD: err.c,v 1.2 2002/06/25 15:50:15 mickey Exp $	*/
3
4/*
5 * log.c
6 *
7 * Based on err.c, which was adapted from OpenBSD libc *err* *warn* code.
8 *
9 * Copyright (c) 2005-2012 Niels Provos and Nick Mathewson
10 *
11 * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
12 *
13 * Copyright (c) 1993
14 *	The Regents of the University of California.  All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 * 3. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41#include "event2/event-config.h"
42#include <sys/cdefs.h>
43__RCSID("$NetBSD: log.c,v 1.6 2021/04/07 03:36:48 christos Exp $");
44#include "evconfig-private.h"
45
46#ifdef _WIN32
47#include <winsock2.h>
48#define WIN32_LEAN_AND_MEAN
49#include <windows.h>
50#undef WIN32_LEAN_AND_MEAN
51#endif
52#include <sys/types.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <stdarg.h>
56#include <string.h>
57#include <errno.h>
58#include "event2/event.h"
59#include "event2/util.h"
60
61#include "log-internal.h"
62
63static void event_log(int severity, const char *msg);
64static void event_exit(int errcode) EV_NORETURN;
65
66static event_fatal_cb fatal_fn = NULL;
67
68#ifdef EVENT_DEBUG_LOGGING_ENABLED
69#ifdef USE_DEBUG
70#define DEFAULT_MASK EVENT_DBG_ALL
71#else
72#define DEFAULT_MASK 0
73#endif
74
75EVENT2_EXPORT_SYMBOL ev_uint32_t event_debug_logging_mask_ = DEFAULT_MASK;
76#endif /* EVENT_DEBUG_LOGGING_ENABLED */
77
78void
79event_enable_debug_logging(ev_uint32_t which)
80{
81#ifdef EVENT_DEBUG_LOGGING_ENABLED
82	event_debug_logging_mask_ = which;
83#endif
84}
85
86void
87event_set_fatal_callback(event_fatal_cb cb)
88{
89	fatal_fn = cb;
90}
91
92static void
93event_exit(int errcode)
94{
95	if (fatal_fn) {
96		fatal_fn(errcode);
97		exit(errcode); /* should never be reached */
98	} else if (errcode == EVENT_ERR_ABORT_)
99		abort();
100	else
101		exit(errcode);
102}
103
104void
105event_err(int eval, const char *fmt, ...)
106{
107	va_list ap;
108
109	va_start(ap, fmt);
110	event_logv_(EVENT_LOG_ERR, strerror(errno), fmt, ap);
111	va_end(ap);
112	event_exit(eval);
113}
114
115void
116event_warn(const char *fmt, ...)
117{
118	va_list ap;
119
120	va_start(ap, fmt);
121	event_logv_(EVENT_LOG_WARN, strerror(errno), fmt, ap);
122	va_end(ap);
123}
124
125void
126event_sock_err(int eval, evutil_socket_t sock, const char *fmt, ...)
127{
128	va_list ap;
129	int err = evutil_socket_geterror(sock);
130
131	va_start(ap, fmt);
132	event_logv_(EVENT_LOG_ERR, evutil_socket_error_to_string(err), fmt, ap);
133	va_end(ap);
134	event_exit(eval);
135}
136
137void
138event_sock_warn(evutil_socket_t sock, const char *fmt, ...)
139{
140	va_list ap;
141	int err = evutil_socket_geterror(sock);
142
143	va_start(ap, fmt);
144	event_logv_(EVENT_LOG_WARN, evutil_socket_error_to_string(err), fmt, ap);
145	va_end(ap);
146}
147
148void
149event_errx(int eval, const char *fmt, ...)
150{
151	va_list ap;
152
153	va_start(ap, fmt);
154	event_logv_(EVENT_LOG_ERR, NULL, fmt, ap);
155	va_end(ap);
156	event_exit(eval);
157}
158
159void
160event_warnx(const char *fmt, ...)
161{
162	va_list ap;
163
164	va_start(ap, fmt);
165	event_logv_(EVENT_LOG_WARN, NULL, fmt, ap);
166	va_end(ap);
167}
168
169void
170event_msgx(const char *fmt, ...)
171{
172	va_list ap;
173
174	va_start(ap, fmt);
175	event_logv_(EVENT_LOG_MSG, NULL, fmt, ap);
176	va_end(ap);
177}
178
179void
180event_debugx_(const char *fmt, ...)
181{
182	va_list ap;
183
184	va_start(ap, fmt);
185	event_logv_(EVENT_LOG_DEBUG, NULL, fmt, ap);
186	va_end(ap);
187}
188
189void
190event_logv_(int severity, const char *errstr, const char *fmt, va_list ap)
191{
192	char buf[1024];
193	size_t len;
194
195	if (severity == EVENT_LOG_DEBUG && !event_debug_get_logging_mask_())
196		return;
197
198	if (fmt != NULL)
199		evutil_vsnprintf(buf, sizeof(buf), fmt, ap);
200	else
201		buf[0] = '\0';
202
203	if (errstr) {
204		len = strlen(buf);
205		if (len < sizeof(buf) - 3) {
206			evutil_snprintf(buf + len, sizeof(buf) - len, ": %s", errstr);
207		}
208	}
209
210	event_log(severity, buf);
211}
212
213static event_log_cb log_fn = NULL;
214
215void
216event_set_log_callback(event_log_cb cb)
217{
218	log_fn = cb;
219}
220
221static void
222event_log(int severity, const char *msg)
223{
224	if (log_fn)
225		log_fn(severity, msg);
226	else {
227		const char *severity_str;
228		switch (severity) {
229		case EVENT_LOG_DEBUG:
230			severity_str = "debug";
231			break;
232		case EVENT_LOG_MSG:
233			severity_str = "msg";
234			break;
235		case EVENT_LOG_WARN:
236			severity_str = "warn";
237			break;
238		case EVENT_LOG_ERR:
239			severity_str = "err";
240			break;
241		default:
242			severity_str = "???";
243			break;
244		}
245		(void)fprintf(stderr, "[%s] %s\n", severity_str, msg);
246	}
247}
248