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 2009 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#include	<unistd.h>
28#include	<strings.h>
29#include	<limits.h>
30#include	<dlfcn.h>
31#include	"_conv.h"
32#include	"lddstub_msg.h"
33
34static int
35originlddstub(char *buffer, const char *orgfile)
36{
37	int	len;
38
39	if (dlinfo(RTLD_SELF, RTLD_DI_ORIGIN, (void *)buffer) == -1)
40		return (-1);
41	if (strlcat(buffer, orgfile, PATH_MAX) >= PATH_MAX)
42		return (-1);
43	if ((len = resolvepath(buffer, buffer, (PATH_MAX - 1))) == -1)
44		return (-1);
45	buffer[len] = '\0';
46	if (access(buffer, X_OK) == -1)
47		return (-1);
48
49	return (1);
50}
51
52static char	orgstub[PATH_MAX], orgstub64[PATH_MAX];
53static int	orgflag, orgflag64;
54
55/*
56 * Determine what lddstub to run.
57 */
58const char *
59conv_lddstub(int class)
60{
61	const char *stub;
62
63	/*
64	 * Establish defaults.
65	 */
66	if (class == ELFCLASS32)
67		stub = MSG_ORIG(MSG_PTH_LDDSTUB);
68	else
69		stub = MSG_ORIG(MSG_PTH_LDDSTUB_64);
70
71	/*
72	 * Provided we're not secure, determine lddstub's location from our
73	 * own origin.
74	 */
75	if (geteuid()) {
76		if ((class == ELFCLASS32) && (orgflag != -1)) {
77			if (orgflag == 0) {
78				/* BEGIN CSTYLED */
79				if ((orgflag = originlddstub(orgstub,
80#ifdef	_LP64
81				    MSG_ORIG(MSG_ORG_64LDD_32STUB))) == -1)
82#else
83				    MSG_ORIG(MSG_ORG_32LDD_32STUB))) == -1)
84#endif
85					return (stub);
86				/* END CSTYLED */
87			}
88			stub = (const char *)orgstub;
89		}
90		if ((class == ELFCLASS64) && (orgflag64 != -1)) {
91			if (orgflag64 == 0) {
92				/* BEGIN CSTYLED */
93				if ((orgflag64 = originlddstub(orgstub64,
94#ifdef	_LP64
95				    MSG_ORIG(MSG_ORG_64LDD_64STUB))) == -1)
96#else
97				    MSG_ORIG(MSG_ORG_32LDD_64STUB))) == -1)
98#endif
99					return (stub);
100				/* END CSTYLED */
101			}
102			stub = (const char *)orgstub64;
103		}
104	}
105	return (stub);
106}
107