source: openpam/trunk/lib/openpam_dynamic.c @ 234

Last change on this file since 234 was 234, checked in by Dag-Erling Smørgrav, 17 years ago

Return code paranoia: compare against 0 instead of -1.

Suggested by: Dmitry V. Levin <ldv@…>

File size: 3.1 KB
Line 
1/*-
2 * Copyright (c) 2002,2003 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * Network Associates Laboratories, the Security Research Division of
7 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
8 * ("CBOSS"), as part of the DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior written
20 *    permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $P4: //depot/projects/openpam/lib/openpam_dynamic.c#11 $
35 */
36
37#include <dlfcn.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41
42#include <security/pam_appl.h>
43
44#include "openpam_impl.h"
45
46/*
47 * OpenPAM internal
48 *
49 * Locate a dynamically linked module
50 */
51
52pam_module_t *
53openpam_dynamic(const char *path)
54{
55        pam_module_t *module;
56        char *vpath;
57        void *dlh;
58        int i;
59
60        dlh = NULL;
61        if ((module = calloc(1, sizeof *module)) == NULL)
62                goto buf_err;
63
64        /* try versioned module first, then unversioned module */
65        if (asprintf(&vpath, "%s.%d", path, LIB_MAJ) < 0)
66                goto buf_err;
67        if ((dlh = dlopen(vpath, RTLD_LAZY)) == NULL) {
68                openpam_log(PAM_LOG_DEBUG, "%s: %s", vpath, dlerror());
69                *strrchr(vpath, '.') = '\0';
70                if ((dlh = dlopen(vpath, RTLD_LAZY)) == NULL) {
71                        openpam_log(PAM_LOG_DEBUG, "%s: %s", vpath, dlerror());
72                        FREE(module);
73                        return (NULL);
74                }
75        }
76        FREE(vpath);
77        if ((module->path = strdup(path)) == NULL)
78                goto buf_err;
79        module->dlh = dlh;
80        for (i = 0; i < PAM_NUM_PRIMITIVES; ++i) {
81                module->func[i] = (pam_func_t)dlsym(dlh, _pam_sm_func_name[i]);
82                if (module->func[i] == NULL)
83                        openpam_log(PAM_LOG_DEBUG, "%s: %s(): %s",
84                            path, _pam_sm_func_name[i], dlerror());
85        }
86        return (module);
87 buf_err:
88        openpam_log(PAM_LOG_ERROR, "%m");
89        if (dlh != NULL)
90                dlclose(dlh);
91        FREE(module);
92        return (NULL);
93}
94
95/*
96 * NOPARSE
97 */
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