1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29/*
30 * Logging support for the DR Daemon
31 */
32
33#include <stdio.h>
34#include <stdarg.h>
35#include <string.h>
36#include <errno.h>
37#include <syslog.h>
38
39#include "drd.h"
40
41#define	DRD_MAX_MSG_LEN		512
42#define	DRD_MAX_TIME_LEN	32
43
44static char *log_prio_str[] = {
45	"EMERG: ",	/* LOG_EMERG */
46	"ALERT: ",	/* LOG_ALERT */
47	"CRIT: ",	/* LOG_CRIT */
48	"ERROR: ",	/* LOG_ERR */
49	"WARNING: ",	/* LOG_WARNING */
50	"NOTICE: ",	/* LOG_NOTICE */
51	"INFO: ",	/* LOG_INFO */
52	""		/* LOG_DEBUG */
53};
54
55/*
56 * Generate a timestamp string in the provided buffer.
57 * If any errors are encountered, the function returns
58 * with the buffer containing an empty string.
59 */
60static void
61drd_timestamp(char *buf, size_t buflen)
62{
63	struct tm	ltime;
64	struct timeval	now;
65
66	if ((buf == NULL) || (buflen == 0))
67		return;
68
69	buf[0] = '\0';
70
71	if (gettimeofday(&now, NULL) != 0) {
72		(void) fprintf(stderr, "gettimeofday failed: %s\n",
73		    strerror(errno));
74		return;
75	}
76
77	if (localtime_r(&now.tv_sec, &ltime) == NULL) {
78		(void) fprintf(stderr, "localtime_r failed: %s\n",
79		    strerror(errno));
80		return;
81	}
82
83	if (strftime(buf, buflen, "%b %e %T ", &ltime) == 0) {
84		(void) fprintf(stderr, "strftime failed: buffer[%d] too "
85		    "small\n", buflen);
86		/*
87		 * On failure, the contents of the buffer
88		 * are indeterminate. Restore it to a known
89		 * state before returning.
90		 */
91		buf[0] = '\0';
92	}
93}
94
95static void
96drd_log_msg(int prio, char *fmt, va_list vap)
97{
98	char msgbuf[DRD_MAX_MSG_LEN];
99	char timebuf[DRD_MAX_TIME_LEN] = "";
100
101	/* generate a timestamp for the SMF log */
102	drd_timestamp(timebuf, sizeof (timebuf));
103
104	(void) vsnprintf(msgbuf, DRD_MAX_MSG_LEN, fmt, vap);
105
106	/*
107	 * Print the message to stderr. In daemon mode, it
108	 * will be sent to the SMF log. In standalone mode,
109	 * it will be sent to the controlling terminal.
110	 */
111	(void) fprintf(stderr, "%s%s%s\n", timebuf, log_prio_str[prio], msgbuf);
112
113	if (drd_daemonized)
114		syslog(prio, msgbuf);
115}
116
117void
118drd_err(char *fmt, ...)
119{
120	va_list vap;
121
122	va_start(vap, fmt);
123	drd_log_msg(LOG_ERR, fmt, vap);
124	va_end(vap);
125}
126
127void
128drd_info(char *fmt, ...)
129{
130	va_list vap;
131
132	va_start(vap, fmt);
133	drd_log_msg(LOG_INFO, fmt, vap);
134	va_end(vap);
135}
136
137void
138drd_dbg(char *fmt, ...)
139{
140	va_list vap;
141
142	if (!drd_debug) {
143		/* not debugging */
144		return;
145	}
146
147	va_start(vap, fmt);
148	drd_log_msg(LOG_DEBUG, fmt, vap);
149	va_end(vap);
150}
151