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 /*
28 * Logging support for the DR Daemon
29 */
30
31 #include <stdio.h>
32 #include <stdarg.h>
33 #include <string.h>
34 #include <errno.h>
35 #include <syslog.h>
36
37 #include "drd.h"
38
39 #define DRD_MAX_MSG_LEN 512
40 #define DRD_MAX_TIME_LEN 32
41
42 static char *log_prio_str[] = {
43 "EMERG: ", /* LOG_EMERG */
44 "ALERT: ", /* LOG_ALERT */
45 "CRIT: ", /* LOG_CRIT */
46 "ERROR: ", /* LOG_ERR */
47 "WARNING: ", /* LOG_WARNING */
48 "NOTICE: ", /* LOG_NOTICE */
49 "INFO: ", /* LOG_INFO */
50 "" /* LOG_DEBUG */
51 };
52
53 /*
54 * Generate a timestamp string in the provided buffer.
55 * If any errors are encountered, the function returns
56 * with the buffer containing an empty string.
57 */
58 static void
drd_timestamp(char * buf,size_t buflen)59 drd_timestamp(char *buf, size_t buflen)
60 {
61 struct tm ltime;
62 struct timeval now;
63
64 if ((buf == NULL) || (buflen == 0))
65 return;
66
67 buf[0] = '\0';
68
69 if (gettimeofday(&now, NULL) != 0) {
70 (void) fprintf(stderr, "gettimeofday failed: %s\n",
71 strerror(errno));
72 return;
73 }
74
75 if (localtime_r(&now.tv_sec, <ime) == NULL) {
76 (void) fprintf(stderr, "localtime_r failed: %s\n",
77 strerror(errno));
78 return;
79 }
80
81 if (strftime(buf, buflen, "%b %e %T ", <ime) == 0) {
82 (void) fprintf(stderr, "strftime failed: buffer[%d] too "
83 "small\n", buflen);
84 /*
85 * On failure, the contents of the buffer
86 * are indeterminate. Restore it to a known
87 * state before returning.
88 */
89 buf[0] = '\0';
90 }
91 }
92
93 static void
drd_log_msg(int prio,char * fmt,va_list vap)94 drd_log_msg(int prio, char *fmt, va_list vap)
95 {
96 char msgbuf[DRD_MAX_MSG_LEN];
97 char timebuf[DRD_MAX_TIME_LEN] = "";
98
99 /* generate a timestamp for the SMF log */
100 drd_timestamp(timebuf, sizeof (timebuf));
101
102 (void) vsnprintf(msgbuf, DRD_MAX_MSG_LEN, fmt, vap);
103
104 /*
105 * Print the message to stderr. In daemon mode, it
106 * will be sent to the SMF log. In standalone mode,
107 * it will be sent to the controlling terminal.
108 */
109 (void) fprintf(stderr, "%s%s%s\n", timebuf, log_prio_str[prio], msgbuf);
110
111 if (drd_daemonized)
112 syslog(prio, msgbuf);
113 }
114
115 void
drd_err(char * fmt,...)116 drd_err(char *fmt, ...)
117 {
118 va_list vap;
119
120 va_start(vap, fmt);
121 drd_log_msg(LOG_ERR, fmt, vap);
122 va_end(vap);
123 }
124
125 void
drd_info(char * fmt,...)126 drd_info(char *fmt, ...)
127 {
128 va_list vap;
129
130 va_start(vap, fmt);
131 drd_log_msg(LOG_INFO, fmt, vap);
132 va_end(vap);
133 }
134
135 void
drd_dbg(char * fmt,...)136 drd_dbg(char *fmt, ...)
137 {
138 va_list vap;
139
140 if (!drd_debug) {
141 /* not debugging */
142 return;
143 }
144
145 va_start(vap, fmt);
146 drd_log_msg(LOG_DEBUG, fmt, vap);
147 va_end(vap);
148 }
149