source: openpam/trunk/lib/libpam/openpam_log.c @ 686

Last change on this file since 686 was 686, checked in by Dag-Erling Smørgrav, 8 years ago

Document that openpam_log(3) saves and restores errno(2).

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File size: 4.5 KB
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1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2011 Dag-Erling Smørgrav
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by ThinkSec AS and
7 * Network Associates Laboratories, the Security Research Division of
8 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
9 * ("CBOSS"), as part of the DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $Id: openpam_log.c 686 2013-07-11 16:36:02Z des $
36 */
37
38#ifdef HAVE_CONFIG_H
39# include "config.h"
40#endif
41
42#include <errno.h>
43#include <stdarg.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <syslog.h>
47
48#include <security/pam_appl.h>
49
50#include "openpam_impl.h"
51#include "openpam_asprintf.h"
52
53int openpam_debug = 0;
54
55#if !defined(openpam_log)
56
57/*
58 * OpenPAM extension
59 *
60 * Log a message through syslog
61 */
62
63void
64openpam_log(int level, const char *fmt, ...)
65{
66        va_list ap;
67        int priority;
68        int serrno;
69
70        switch (level) {
71        case PAM_LOG_LIBDEBUG:
72        case PAM_LOG_DEBUG:
73                if (!openpam_debug)
74                        return;
75                priority = LOG_DEBUG;
76                break;
77        case PAM_LOG_VERBOSE:
78                priority = LOG_INFO;
79                break;
80        case PAM_LOG_NOTICE:
81                priority = LOG_NOTICE;
82                break;
83        case PAM_LOG_ERROR:
84        default:
85                priority = LOG_ERR;
86                break;
87        }
88        serrno = errno;
89        va_start(ap, fmt);
90        vsyslog(priority, fmt, ap);
91        va_end(ap);
92        errno = serrno;
93}
94
95#else
96
97void
98_openpam_log(int level, const char *func, const char *fmt, ...)
99{
100        va_list ap;
101        char *format;
102        int priority;
103        int serrno;
104
105        switch (level) {
106        case PAM_LOG_LIBDEBUG:
107        case PAM_LOG_DEBUG:
108                if (!openpam_debug)
109                        return;
110                priority = LOG_DEBUG;
111                break;
112        case PAM_LOG_VERBOSE:
113                priority = LOG_INFO;
114                break;
115        case PAM_LOG_NOTICE:
116                priority = LOG_NOTICE;
117                break;
118        case PAM_LOG_ERROR:
119        default:
120                priority = LOG_ERR;
121                break;
122        }
123        serrno = errno;
124        va_start(ap, fmt);
125        if (asprintf(&format, "in %s(): %s", func, fmt) > 0) {
126                errno = serrno;
127                vsyslog(priority, format, ap);
128                FREE(format);
129        } else {
130                errno = serrno;
131                vsyslog(priority, fmt, ap);
132        }
133        va_end(ap);
134        errno = serrno;
135}
136
137#endif
138
139/**
140 * The =openpam_log function logs messages using =syslog.
141 * It is primarily intended for internal use by the library and modules.
142 *
143 * The =level argument indicates the importance of the message.
144 * The following levels are defined:
145 *
146 *      =PAM_LOG_LIBDEBUG:
147 *              Debugging messages.
148 *              For internal use only.
149 *      =PAM_LOG_DEBUG:
150 *              Debugging messages.
151 *              These messages are normally not logged unless the global
152 *              integer variable :openpam_debug is set to a non-zero
153 *              value, in which case they are logged with a =syslog
154 *              priority of =LOG_DEBUG.
155 *      =PAM_LOG_VERBOSE:
156 *              Information about the progress of the authentication
157 *              process, or other non-essential messages.
158 *              These messages are logged with a =syslog priority of
159 *              =LOG_INFO.
160 *      =PAM_LOG_NOTICE:
161 *              Messages relating to non-fatal errors.
162 *              These messages are logged with a =syslog priority of
163 *              =LOG_NOTICE.
164 *      =PAM_LOG_ERROR:
165 *              Messages relating to serious errors.
166 *              These messages are logged with a =syslog priority of
167 *              =LOG_ERR.
168 *
169 * The remaining arguments are a =printf format string and the
170 * corresponding arguments.
171 *
172 * The =openpam_log function does not modify the value of :errno.
173 */
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