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 (c) 2013 Gary Mills
24 *
25 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
26 * Use is subject to license terms.
27 */
28
29 /* Copyright (c) 1988 AT&T */
30 /* All Rights Reserved */
31
32 #pragma weak _getlogin = getloginx
33 #pragma weak _getlogin_r = getloginx_r
34
35 #include "lint.h"
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <fcntl.h>
39 #include <string.h>
40 #include <stdlib.h>
41 #include <limits.h>
42 #include "utmpx.h"
43 #include <unistd.h>
44 #include <errno.h>
45 #include <thread.h>
46 #include <synch.h>
47 #include <mtlib.h>
48 #include "tsd.h"
49
50 /* Revert the renames done in unistd.h */
51 #ifdef __PRAGMA_REDEFINE_EXTNAME
52 #pragma redefine_extname getlogint getlogin
53 #pragma redefine_extname getlogint_r getlogin_r
54 #pragma redefine_extname __posix_getlogint_r __posix_getlogin_r
55 #else /* __PRAGMA_REDEFINE_EXTNAME */
56 #ifdef getlogin
57 #undef getlogin
58 #endif /* getlogin */
59 #ifdef getlogin_r
60 #undef getlogin_r
61 #endif /* getlogin_r */
62 #ifdef __posix_getlogin_r
63 #undef __posix_getlogin_r
64 #endif /* __posix_getlogin_r */
65 #define getlogint getlogin
66 #define getlogint_r getlogin_r
67 #define __posix_getlogint_r __posix_getlogin_r
68 #endif /* __PRAGMA_REDEFINE_EXTNAME */
69
70 /*
71 * Use the full length of a login name.
72 * The utmpx interface provides for a 32 character login name.
73 */
74 #define NMAX (sizeof (((struct utmpx *)0)->ut_user))
75
76 /*
77 * Common function
78 */
79 static char *
80 getl_r_common(char *answer, size_t namelen, size_t maxlen)
81 {
82 int uf;
83 off64_t me;
84 struct futmpx ubuf;
85
86 if ((me = (off64_t)ttyslot()) < 0)
87 return (NULL);
88 if ((uf = open64(UTMPX_FILE, 0)) < 0)
89 return (NULL);
90 (void) lseek64(uf, me * sizeof (ubuf), SEEK_SET);
91 if (read(uf, &ubuf, sizeof (ubuf)) != sizeof (ubuf)) {
92 (void) close(uf);
93 return (NULL);
94 }
95 (void) close(uf);
96 if (ubuf.ut_user[0] == '\0')
97 return (NULL);
98
99 /* Insufficient buffer size */
100 if (namelen < strnlen(&ubuf.ut_user[0], maxlen)) {
101 errno = ERANGE;
102 return (NULL);
103 }
104 (void) strncpy(&answer[0], &ubuf.ut_user[0], maxlen);
105 answer[maxlen] = '\0';
106 return (&answer[0]);
107 }
108
109 /*
110 * POSIX.1c Draft-6 version of the function getlogin_r.
111 * It was implemented by Solaris 2.3.
112 */
113 char *
114 getlogint_r(char *answer, int namelen)
115 {
116 return (getl_r_common(answer, (size_t)namelen, LOGNAME_MAX_TRAD));
117 }
118
119 /*
120 * POSIX.1c standard version of the function getlogin_r.
121 * User gets it via static getlogin_r from the header file.
122 */
123 int
124 __posix_getlogint_r(char *name, int namelen)
125 {
126 int nerrno = 0;
127 int oerrno = errno;
128
129 errno = 0;
130 if (getl_r_common(name, (size_t)namelen, LOGNAME_MAX_TRAD) == NULL) {
131 if (errno == 0)
132 nerrno = EINVAL;
133 else
134 nerrno = errno;
135 }
136 errno = oerrno;
137 return (nerrno);
138 }
139
140 char *
141 getlogint(void)
142 {
143 char *answer = tsdalloc(_T_LOGIN, LOGIN_NAME_MAX_TRAD, NULL);
144
145 if (answer == NULL)
146 return (NULL);
147 return (getl_r_common(answer, LOGIN_NAME_MAX_TRAD, LOGNAME_MAX_TRAD));
148 }
149
150 /*
151 * POSIX.1c Draft-6 version of the function getlogin_r.
152 * It was implemented by Solaris 2.3.
153 * For extended login names, selected by redefine_extname in unistd.h.
154 */
155 char *
156 getloginx_r(char *answer, int namelen)
157 {
158 return (getl_r_common(answer, (size_t)namelen, NMAX));
159 }
160
161 /*
162 * POSIX.1c standard version of the function getlogin_r.
163 * User gets it via static getlogin_r from the header file.
164 * For extended login names, selected by redefine_extname in unistd.h.
165 */
166 int
167 __posix_getloginx_r(char *name, int namelen)
168 {
169 int nerrno = 0;
170 int oerrno = errno;
171
172 errno = 0;
173 if (getl_r_common(name, (size_t)namelen, NMAX) == NULL) {
174 if (errno == 0)
175 nerrno = EINVAL;
176 else
177 nerrno = errno;
178 }
179 errno = oerrno;
180 return (nerrno);
181 }
182
183 /*
184 * For extended login names, selected by redefine_extname in unistd.h.
185 */
186 char *
187 getloginx(void)
188 {
189 char *answer = tsdalloc(_T_LOGIN, LOGIN_NAME_MAX, NULL);
190
191 if (answer == NULL)
192 return (NULL);
193 return (getl_r_common(answer, LOGIN_NAME_MAX, NMAX));
194 }