strsave.c revision 1219:f89f56c2d9ac 
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, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23/*
24 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
29/*	  All Rights Reserved  	*/
30
31#pragma ident	"%Z%%M%	%I%	%E% SMI"
32
33#include "mt.h"
34#include "uucp.h"
35
36/* copy str into data space -- caller should report errors. */
37
38static char *
39strsave(const char *str)
40{
41	char *rval;
42
43	rval = malloc(strlen(str) + 1);
44	if (rval != 0)
45		(void) strcpy(rval, str);
46	return (rval);
47}
48
49/*
50 * Determine if the effective user id has the appropriate permission
51 *	on a file.  Modeled after access(2).
52 *	amode:
53 *		00	just checks for file existence.
54 *		04	checks read permission.
55 *		02	checks write permission.
56 *		01	checks execute/search permission.
57 *		other bits are ignored quietly.
58 */
59
60static int
61eaccess(char *path, mode_t amode)
62{
63	struct stat	s;
64	uid_t euid;
65
66	if (stat(path, &s) == -1)
67		return (-1);		/* can't stat file */
68	amode &= 07;
69
70	if ((euid = geteuid()) == 0)		/* root can do all */
71		return (0);
72	if (euid == s.st_uid)
73	    s.st_mode >>= 6;		/* use owner bits */
74	else if (getegid() == s.st_gid)
75	    s.st_mode >>= 3;		/* use group bits */
76
77	if ((amode & s.st_mode) == amode)
78		return (0);		/* access permitted */
79	errno = EACCES;
80	return (-1);
81}
82