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  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <stdarg.h>
29 #include <syslog.h>
30 #include <string.h>
31 #include <cryptoutil.h>
32 
33 #define	CRYPTO_DEBUG_ENV	"SUNW_CRYPTO_DEBUG"
34 
35 static char *_cryptodebug_prefix = NULL;
36 static int _cryptodebug_enabled = -1; /* -1 unknown, 0 disabled, 1 enabled */
37 static int _cryptoerror_enabled = 1; /* 0 disabled, 1 enabled */
38 static boolean_t _cryptodebug_syslog = B_TRUE;
39 
40 /*PRINTFLIKE1*/
41 void
cryptodebug(const char * fmt,...)42 cryptodebug(const char *fmt, ...)
43 {
44 	va_list args;
45 	char fmtbuf[BUFSIZ];
46 	char msgbuf[BUFSIZ];
47 
48 	if (fmt == NULL || _cryptodebug_enabled != 1)
49 		return;
50 
51 	va_start(args, fmt);
52 	if (_cryptodebug_prefix == NULL) {
53 		(void) vsnprintf(msgbuf, sizeof (msgbuf), fmt, args);
54 	} else {
55 		(void) snprintf(fmtbuf, sizeof (fmtbuf), "%s: %s",
56 		    _cryptodebug_prefix, fmt);
57 		(void) vsnprintf(msgbuf, sizeof (msgbuf), fmtbuf, args);
58 	}
59 
60 	if (_cryptodebug_syslog) {
61 		syslog(LOG_DEBUG, msgbuf);
62 	} else {
63 		(void) fprintf(stderr, "%s\n", msgbuf);
64 	}
65 	va_end(args);
66 }
67 
68 /*
69  * cryptoerror
70  *
71  * This is intended to be used both by interactive commands like cryptoadm(1m)
72  * digest(1) etc, and by libraries libpkcs11, libelfsign etc.
73  *
74  * A library probably wants most (all?) of its errors going to syslog but
75  * commands are usually happy for them to go to stderr.
76  *
77  * If a syslog priority is passed we log on that priority.  Otherwise we
78  * use LOG_STDERR to mean use stderr instead. LOG_STDERR is defined in
79  * cryptoutil.h
80  */
81 
82 /*PRINTFLIKE2*/
83 void
cryptoerror(int priority,const char * fmt,...)84 cryptoerror(int priority, const char *fmt, ...)
85 {
86 	char fmtbuf[BUFSIZ];
87 	char msgbuf[BUFSIZ];
88 	va_list args;
89 
90 	if (fmt == NULL || _cryptoerror_enabled == 0)
91 		return;
92 
93 	va_start(args, fmt);
94 	if (_cryptodebug_prefix == NULL) {
95 		(void) vsnprintf(msgbuf, sizeof (msgbuf), fmt, args);
96 	} else {
97 		(void) snprintf(fmtbuf, sizeof (fmtbuf), "%s: %s",
98 		    _cryptodebug_prefix, fmt);
99 		(void) vsnprintf(msgbuf, sizeof (msgbuf), fmtbuf, args);
100 	}
101 
102 	if ((priority == LOG_STDERR) || (priority < 0))  {
103 		(void) fprintf(stderr, "%s\n", msgbuf);
104 	} else {
105 		syslog(priority, msgbuf);
106 	}
107 	va_end(args);
108 }
109 
110 void
cryptoerror_off()111 cryptoerror_off()
112 {
113 	_cryptoerror_enabled = 0;
114 }
115 
116 void
cryptoerror_on()117 cryptoerror_on()
118 {
119 	_cryptoerror_enabled = 1;
120 }
121 
122 void
cryptodebug_init(const char * prefix)123 cryptodebug_init(const char *prefix)
124 {
125 	char *envval = NULL;
126 
127 	if (prefix != NULL) {
128 		_cryptodebug_prefix = strdup(prefix);
129 	}
130 
131 	if (_cryptodebug_enabled == -1) {
132 		envval = getenv(CRYPTO_DEBUG_ENV);
133 		/*
134 		 * If unset or it isn't one of syslog or stderr
135 		 * disable debug.
136 		 */
137 		if (envval == NULL || (strcmp(envval, "") == 0)) {
138 			_cryptodebug_enabled = 0;
139 			return;
140 		} else if (strcmp(envval, "stderr") == 0) {
141 			_cryptodebug_syslog = B_FALSE;
142 			_cryptodebug_enabled = 1;
143 		} else if (strcmp(envval, "syslog") == 0) {
144 			_cryptodebug_syslog = B_TRUE;
145 			_cryptodebug_enabled = 1;
146 		}
147 	}
148 
149 	openlog(_cryptodebug_prefix, LOG_PID, LOG_USER);
150 }
151 
152 #pragma fini(_cryptodebug_fini)
153 
154 static void
_cryptodebug_fini(void)155 _cryptodebug_fini(void)
156 {
157 	if (_cryptodebug_prefix != NULL)
158 		free(_cryptodebug_prefix);
159 }
160