source: openpam/trunk/lib/libpam/openpam_log.c @ 681

Last change on this file since 681 was 681, checked in by Dag-Erling Smørgrav, 8 years ago

Always restore errno before returning from openpam_log().

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 4.5 KB
Line 
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 681 2013-04-14 14:36:05Z 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
53#ifdef OPENPAM_DEBUG
54int openpam_debug = 1;
55#else
56int openpam_debug = 0;
57#endif
58
59#if !defined(openpam_log)
60
61/*
62 * OpenPAM extension
63 *
64 * Log a message through syslog
65 */
66
67void
68openpam_log(int level, const char *fmt, ...)
69{
70        va_list ap;
71        int priority;
72        int serrno;
73
74        switch (level) {
75        case PAM_LOG_LIBDEBUG:
76        case PAM_LOG_DEBUG:
77                if (!openpam_debug)
78                        return;
79                priority = LOG_DEBUG;
80                break;
81        case PAM_LOG_VERBOSE:
82                priority = LOG_INFO;
83                break;
84        case PAM_LOG_NOTICE:
85                priority = LOG_NOTICE;
86                break;
87        case PAM_LOG_ERROR:
88        default:
89                priority = LOG_ERR;
90                break;
91        }
92        serrno = errno;
93        va_start(ap, fmt);
94        vsyslog(priority, fmt, ap);
95        va_end(ap);
96        errno = serrno;
97}
98
99#else
100
101void
102_openpam_log(int level, const char *func, const char *fmt, ...)
103{
104        va_list ap;
105        char *format;
106        int priority;
107        int serrno;
108
109        switch (level) {
110        case PAM_LOG_LIBDEBUG:
111        case PAM_LOG_DEBUG:
112                if (!openpam_debug)
113                        return;
114                priority = LOG_DEBUG;
115                break;
116        case PAM_LOG_VERBOSE:
117                priority = LOG_INFO;
118                break;
119        case PAM_LOG_NOTICE:
120                priority = LOG_NOTICE;
121                break;
122        case PAM_LOG_ERROR:
123        default:
124                priority = LOG_ERR;
125                break;
126        }
127        serrno = errno;
128        va_start(ap, fmt);
129        if (asprintf(&format, "in %s(): %s", func, fmt) > 0) {
130                errno = serrno;
131                vsyslog(priority, format, ap);
132                FREE(format);
133        } else {
134                errno = serrno;
135                vsyslog(priority, fmt, ap);
136        }
137        va_end(ap);
138        errno = serrno;
139}
140
141#endif
142
143/**
144 * The =openpam_log function logs messages using =syslog.
145 * It is primarily intended for internal use by the library and modules.
146 *
147 * The =level argument indicates the importance of the message.
148 * The following levels are defined:
149 *
150 *      =PAM_LOG_LIBDEBUG:
151 *              Debugging messages.
152 *              For internal use only.
153 *      =PAM_LOG_DEBUG:
154 *              Debugging messages.
155 *              These messages are normally not logged unless the global
156 *              integer variable :openpam_debug is set to a non-zero
157 *              value, in which case they are logged with a =syslog
158 *              priority of =LOG_DEBUG.
159 *      =PAM_LOG_VERBOSE:
160 *              Information about the progress of the authentication
161 *              process, or other non-essential messages.
162 *              These messages are logged with a =syslog priority of
163 *              =LOG_INFO.
164 *      =PAM_LOG_NOTICE:
165 *              Messages relating to non-fatal errors.
166 *              These messages are logged with a =syslog priority of
167 *              =LOG_NOTICE.
168 *      =PAM_LOG_ERROR:
169 *              Messages relating to serious errors.
170 *              These messages are logged with a =syslog priority of
171 *              =LOG_ERR.
172 *
173 * The remaining arguments are a =printf format string and the
174 * corresponding arguments.
175 */
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