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 /* Safety check: never use broken files. */ 74 if (db != UTXDB_LOG && _fstat(fileno(uf), &sb) != -1 && 75 sb.st_size % sizeof(struct futx) != 0) { 76 fclose(uf); 77 uf = NULL; 78 errno = EFTYPE; 79 return (-1); 80 } 81 82 udb = db; 83 return (0); 84 } 85 86 void 87 setutxent(void) 88 { 89 90 setutxdb(UTXDB_ACTIVE, NULL); 91 } 92 93 void 94 endutxent(void) 95 { 96 97 if (uf != NULL) { 98 fclose(uf); 99 uf = NULL; 100 } 101 } 102 103 static int 104 getfutxent(struct futx *fu) 105 { 106 107 if (uf == NULL) 108 setutxent(); 109 if (uf == NULL) 110 return (-1); 111 112 if (udb == UTXDB_LOG) { 113 uint16_t len; 114 115 if (fread(&len, sizeof len, 1, uf) != 1) 116 return (-1); 117 len = be16toh(len); 118 if (len > sizeof *fu) { 119 /* Forward compatibility. */ 120 if (fread(fu, sizeof *fu, 1, uf) != 1) 121 return (-1); 122 fseek(uf, len - sizeof *fu, SEEK_CUR); 123 } else { 124 /* Partial record. */ 125 memset(fu, 0, sizeof *fu); 126 if (fread(fu, len, 1, uf) != 1) 127 return (-1); 128 } 129 } else { 130 if (fread(fu, sizeof *fu, 1, uf) != 1) 131 return (-1); 132 } 133 return (0); 134 } 135 136 struct utmpx * 137 getutxent(void) 138 { 139 struct futx fu; 140 141 if (getfutxent(&fu) != 0) 142 return (NULL); 143 return (futx_to_utx(&fu)); 144 } 145 146 struct utmpx * 147 getutxid(const struct utmpx *id) 148 { 149 struct futx fu; 150 151 for (;;) { 152 if (getfutxent(&fu) != 0) 153 return (NULL); 154 155 switch (fu.fu_type) { 156 case USER_PROCESS: 157 case INIT_PROCESS: 158 case LOGIN_PROCESS: 159 case DEAD_PROCESS: 160 switch (id->ut_type) { 161 case USER_PROCESS: 162 case INIT_PROCESS: 163 case LOGIN_PROCESS: 164 case DEAD_PROCESS: 165 if (memcmp(fu.fu_id, id->ut_id, 166 MIN(sizeof fu.fu_id, sizeof id->ut_id)) == 0) 167 goto found; 168 } 169 break; 170 default: 171 if (fu.fu_type == id->ut_type) 172 goto found; 173 break; 174 } 175 } 176 177 found: 178 return (futx_to_utx(&fu)); 179 } 180 181 struct utmpx * 182 getutxline(const struct utmpx *line) 183 { 184 struct futx fu; 185 186 for (;;) { 187 if (getfutxent(&fu) != 0) 188 return (NULL); 189 190 switch (fu.fu_type) { 191 case USER_PROCESS: 192 case LOGIN_PROCESS: 193 if (strncmp(fu.fu_line, line->ut_line, 194 MIN(sizeof fu.fu_line, sizeof line->ut_line)) == 0) 195 goto found; 196 break; 197 } 198 } 199 200 found: 201 return (futx_to_utx(&fu)); 202 } 203 204 struct utmpx * 205 getutxuser(const char *user) 206 { 207 struct futx fu; 208 209 for (;;) { 210 if (getfutxent(&fu) != 0) 211 return (NULL); 212 213 switch (fu.fu_type) { 214 case USER_PROCESS: 215 if (strncmp(fu.fu_user, user, sizeof fu.fu_user) == 0) 216 goto found; 217 break; 218 } 219 } 220 221 found: 222 return (futx_to_utx(&fu)); 223 } 224