1 /*- 2 * Copyright (c) 2010 Ed Schouten <ed@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "namespace.h" 31 #include <sys/endian.h> 32 #include <sys/param.h> 33 #include <sys/stat.h> 34 #include <errno.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <utmpx.h> 38 #include "utxdb.h" 39 #include "un-namespace.h" 40 41 static FILE *uf = NULL; 42 static int udb; 43 44 int 45 setutxdb(int db, const char *file) 46 { 47 struct stat sb; 48 49 switch (db) { 50 case UTXDB_ACTIVE: 51 if (file == NULL) 52 file = _PATH_UTX_ACTIVE; 53 break; 54 case UTXDB_LASTLOGIN: 55 if (file == NULL) 56 file = _PATH_UTX_LASTLOGIN; 57 break; 58 case UTXDB_LOG: 59 if (file == NULL) 60 file = _PATH_UTX_LOG; 61 break; 62 default: 63 errno = EINVAL; 64 return (-1); 65 } 66 67 if (uf != NULL) 68 fclose(uf); 69 uf = fopen(file, "r"); 70 if (uf == NULL) 71 return (-1); 72 73 if (db != UTXDB_LOG) { 74 /* Safety check: never use broken files. */ 75 if (_fstat(fileno(uf), &sb) != -1 && 76 sb.st_size % sizeof(struct futx) != 0) { 77 fclose(uf); 78 uf = NULL; 79 errno = EFTYPE; 80 return (-1); 81 } 82 /* Prevent reading of partial records. */ 83 (void)setvbuf(uf, NULL, _IOFBF, 84 rounddown(BUFSIZ, sizeof(struct futx))); 85 } 86 87 udb = db; 88 return (0); 89 } 90 91 void 92 setutxent(void) 93 { 94 95 setutxdb(UTXDB_ACTIVE, NULL); 96 } 97 98 void 99 endutxent(void) 100 { 101 102 if (uf != NULL) { 103 fclose(uf); 104 uf = NULL; 105 } 106 } 107 108 static int 109 getfutxent(struct futx *fu) 110 { 111 112 if (uf == NULL) 113 setutxent(); 114 if (uf == NULL) 115 return (-1); 116 117 if (udb == UTXDB_LOG) { 118 uint16_t len; 119 120 if (fread(&len, sizeof(len), 1, uf) != 1) 121 return (-1); 122 len = be16toh(len); 123 if (len > sizeof *fu) { 124 /* Forward compatibility. */ 125 if (fread(fu, sizeof(*fu), 1, uf) != 1) 126 return (-1); 127 fseek(uf, len - sizeof(*fu), SEEK_CUR); 128 } else { 129 /* Partial record. */ 130 memset(fu, 0, sizeof(*fu)); 131 if (fread(fu, len, 1, uf) != 1) 132 return (-1); 133 } 134 } else { 135 if (fread(fu, sizeof(*fu), 1, uf) != 1) 136 return (-1); 137 } 138 return (0); 139 } 140 141 struct utmpx * 142 getutxent(void) 143 { 144 struct futx fu; 145 146 if (getfutxent(&fu) != 0) 147 return (NULL); 148 return (futx_to_utx(&fu)); 149 } 150 151 struct utmpx * 152 getutxid(const struct utmpx *id) 153 { 154 struct futx fu; 155 156 for (;;) { 157 if (getfutxent(&fu) != 0) 158 return (NULL); 159 160 switch (fu.fu_type) { 161 case USER_PROCESS: 162 case INIT_PROCESS: 163 case LOGIN_PROCESS: 164 case DEAD_PROCESS: 165 switch (id->ut_type) { 166 case USER_PROCESS: 167 case INIT_PROCESS: 168 case LOGIN_PROCESS: 169 case DEAD_PROCESS: 170 if (memcmp(fu.fu_id, id->ut_id, 171 MIN(sizeof(fu.fu_id), sizeof(id->ut_id))) == 172 0) 173 goto found; 174 } 175 break; 176 default: 177 if (fu.fu_type == id->ut_type) 178 goto found; 179 break; 180 } 181 } 182 183 found: 184 return (futx_to_utx(&fu)); 185 } 186 187 struct utmpx * 188 getutxline(const struct utmpx *line) 189 { 190 struct futx fu; 191 192 for (;;) { 193 if (getfutxent(&fu) != 0) 194 return (NULL); 195 196 switch (fu.fu_type) { 197 case USER_PROCESS: 198 case LOGIN_PROCESS: 199 if (strncmp(fu.fu_line, line->ut_line, 200 MIN(sizeof(fu.fu_line), sizeof(line->ut_line))) == 201 0) 202 goto found; 203 break; 204 } 205 } 206 207 found: 208 return (futx_to_utx(&fu)); 209 } 210 211 struct utmpx * 212 getutxuser(const char *user) 213 { 214 struct futx fu; 215 216 for (;;) { 217 if (getfutxent(&fu) != 0) 218 return (NULL); 219 220 switch (fu.fu_type) { 221 case USER_PROCESS: 222 if (strncmp(fu.fu_user, user, sizeof(fu.fu_user)) == 0) 223 goto found; 224 break; 225 } 226 } 227 228 found: 229 return (futx_to_utx(&fu)); 230 } 231