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
44 static 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 */
60 static void
drd_timestamp(char * buf,size_t buflen)61 drd_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, <ime) == 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 ", <ime) == 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
95 static void
drd_log_msg(int prio,char * fmt,va_list vap)96 drd_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
117 void
drd_err(char * fmt,...)118 drd_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
127 void
drd_info(char * fmt,...)128 drd_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
137 void
drd_dbg(char * fmt,...)138 drd_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