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 } 195