| 1 | /*- |
| 2 | * Copyright (c) 2002 The NetBSD Foundation, Inc. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to The NetBSD Foundation |
| 6 | * by Christos Zoulas. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 18 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 19 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 20 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 21 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 22 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 23 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 24 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 25 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 26 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 27 | * POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #include "namespace.h" |
| 31 | #include <sys/types.h> |
| 32 | #include <sys/param.h> |
| 33 | #include <sys/socket.h> |
| 34 | #include <sys/stat.h> |
| 35 | #include <sys/time.h> |
| 36 | #include <sys/wait.h> |
| 37 | |
| 38 | #include <assert.h> |
| 39 | #include <db.h> |
| 40 | #include <errno.h> |
| 41 | #include <fcntl.h> |
| 42 | #include <stdio.h> |
| 43 | #include <stdlib.h> |
| 44 | #include <string.h> |
| 45 | #include <unistd.h> |
| 46 | #include <pwd.h> |
| 47 | #include <utmp.h> |
| 48 | #include <utmpx.h> |
| 49 | #include <vis.h> |
| 50 | |
| 51 | static FILE *fp; |
| 52 | static int readonly = 0; |
| 53 | static struct utmpx ut; |
| 54 | static char utfile[MAXPATHLEN] = _PATH_UTMPX; |
| 55 | |
| 56 | static struct utmpx *utmp_update(const struct utmpx *); |
| 57 | |
| 58 | static const char vers[] = "utmpx-2.00"; |
| 59 | static utx_db_t dbtype = UTX_DB_UTMPX; |
| 60 | DB *lastlogx_db = NULL; |
| 61 | |
| 62 | static int |
| 63 | _open_db(const char *fname) |
| 64 | { |
| 65 | struct stat st; |
| 66 | |
| 67 | if ((fp = fopen(fname, "re+")) == NULL) |
| 68 | if ((fp = fopen(fname, "we+")) == NULL) { |
| 69 | if ((fp = fopen(fname, "re")) == NULL) |
| 70 | goto fail; |
| 71 | else |
| 72 | readonly = 1; |
| 73 | } |
| 74 | |
| 75 | /* get file size in order to check if new file */ |
| 76 | if (fstat(fileno(fp), &st) == -1) |
| 77 | goto failclose; |
| 78 | |
| 79 | if (st.st_size == 0) { |
| 80 | /* new file, add signature record */ |
| 81 | (void)memset(&ut, 0, sizeof(ut)); |
| 82 | ut.ut_type = SIGNATURE; |
| 83 | (void)memcpy(ut.ut_user, vers, sizeof(vers)); |
| 84 | if (fwrite(&ut, sizeof(ut), 1, fp) != 1) |
| 85 | goto failclose; |
| 86 | } else { |
| 87 | /* old file, read signature record */ |
| 88 | if (fread(&ut, sizeof(ut), 1, fp) != 1) |
| 89 | goto failclose; |
| 90 | if (memcmp(ut.ut_user, vers, 5) != 0 || |
| 91 | ut.ut_type != SIGNATURE) { |
| 92 | errno = EINVAL; |
| 93 | goto failclose; |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | return 0; |
| 98 | failclose: |
| 99 | (void)fclose(fp); |
| 100 | fail: |
| 101 | (void)memset(&ut, 0, sizeof(ut)); |
| 102 | return -1; |
| 103 | } |
| 104 | |
| 105 | int |
| 106 | setutxdb(utx_db_t db_type, const char *fname) |
| 107 | { |
| 108 | switch (db_type) { |
| 109 | case UTX_DB_UTMPX: |
| 110 | if (fname == NULL) |
| 111 | fname = _PATH_UTMPX; |
| 112 | break; |
| 113 | |
| 114 | case UTX_DB_WTMPX: |
| 115 | if (fname == NULL) |
| 116 | fname = _PATH_WTMPX; |
| 117 | break; |
| 118 | |
| 119 | default: |
| 120 | errno = EINVAL; |
| 121 | return -1; |
| 122 | } |
| 123 | |
| 124 | /* A previous db file is still open */ |
| 125 | if (fp != NULL) { |
| 126 | fclose(fp); |
| 127 | fp = NULL; |
| 128 | } |
| 129 | if ((_open_db(fname)) == -1) |
| 130 | return -1; |
| 131 | |
| 132 | dbtype = db_type; |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | void |
| 137 | setutxent(void) |
| 138 | { |
| 139 | (void)memset(&ut, 0, sizeof(ut)); |
| 140 | if (fp == NULL) |
| 141 | return; |
| 142 | (void)fseeko(fp, (off_t)sizeof(ut), SEEK_SET); |
| 143 | } |
| 144 | |
| 145 | void |
| 146 | endutxent(void) |
| 147 | { |
| 148 | (void)memset(&ut, 0, sizeof(ut)); |
| 149 | |
| 150 | if (fp != NULL) { |
| 151 | (void)fclose(fp); |
| 152 | fp = NULL; |
| 153 | readonly = 0; |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | struct utmpx * |
| 158 | getutxent(void) |
| 159 | { |
| 160 | if (fp == NULL) { |
| 161 | if ((_open_db(utfile)) == -1) |
| 162 | goto fail; |
| 163 | } |
| 164 | |
| 165 | if (fread(&ut, sizeof(ut), 1, fp) != 1) |
| 166 | goto fail; |
| 167 | |
| 168 | return &ut; |
| 169 | fail: |
| 170 | (void)memset(&ut, 0, sizeof(ut)); |
| 171 | return NULL; |
| 172 | } |
| 173 | |
| 174 | struct utmpx * |
| 175 | getutxid(const struct utmpx *utx) |
| 176 | { |
| 177 | |
| 178 | _DIAGASSERT(utx != NULL); |
| 179 | |
| 180 | if (utx->ut_type == EMPTY) |
| 181 | return NULL; |
| 182 | |
| 183 | do { |
| 184 | if (ut.ut_type == EMPTY) |
| 185 | continue; |
| 186 | switch (utx->ut_type) { |
| 187 | case EMPTY: |
| 188 | return NULL; |
| 189 | case RUN_LVL: |
| 190 | case BOOT_TIME: |
| 191 | case OLD_TIME: |
| 192 | case NEW_TIME: |
| 193 | if (ut.ut_type == utx->ut_type) |
| 194 | return &ut; |
| 195 | break; |
| 196 | case INIT_PROCESS: |
| 197 | case LOGIN_PROCESS: |
| 198 | case USER_PROCESS: |
| 199 | case DEAD_PROCESS: |
| 200 | switch (ut.ut_type) { |
| 201 | case INIT_PROCESS: |
| 202 | case LOGIN_PROCESS: |
| 203 | case USER_PROCESS: |
| 204 | case DEAD_PROCESS: |
| 205 | if (memcmp(ut.ut_id, utx->ut_id, |
| 206 | sizeof(ut.ut_id)) == 0) |
| 207 | return &ut; |
| 208 | break; |
| 209 | default: |
| 210 | break; |
| 211 | } |
| 212 | break; |
| 213 | default: |
| 214 | return NULL; |
| 215 | } |
| 216 | } while (getutxent() != NULL); |
| 217 | return NULL; |
| 218 | } |
| 219 | |
| 220 | struct utmpx * |
| 221 | getutxline(const struct utmpx *utx) |
| 222 | { |
| 223 | |
| 224 | _DIAGASSERT(utx != NULL); |
| 225 | |
| 226 | do { |
| 227 | switch (ut.ut_type) { |
| 228 | case EMPTY: |
| 229 | break; |
| 230 | case LOGIN_PROCESS: |
| 231 | case USER_PROCESS: |
| 232 | if (strncmp(ut.ut_line, utx->ut_line, |
| 233 | sizeof(ut.ut_line)) == 0) |
| 234 | return &ut; |
| 235 | break; |
| 236 | default: |
| 237 | break; |
| 238 | } |
| 239 | } while (getutxent() != NULL); |
| 240 | return NULL; |
| 241 | } |
| 242 | |
| 243 | struct utmpx * |
| 244 | pututxline(const struct utmpx *utx) |
| 245 | { |
| 246 | struct passwd *pw; |
| 247 | struct lastlogx ll; |
| 248 | struct utmpx temp, *u = NULL; |
| 249 | int gotlock = 0; |
| 250 | |
| 251 | _DIAGASSERT(utx != NULL); |
| 252 | |
| 253 | if (utx == NULL) |
| 254 | return NULL; |
| 255 | |
| 256 | if (utx->ut_type == USER_PROCESS) { |
| 257 | ll.ll_tv = utx->ut_tv; |
| 258 | strcpy(ll.ll_host, utx->ut_host); |
| 259 | strcpy(ll.ll_line, utx->ut_line); |
| 260 | pw = getpwnam(utx->ut_name); |
| 261 | if (pw != NULL) |
| 262 | updlastlogx(_PATH_LASTLOGX, pw->pw_uid, &ll); |
| 263 | } |
| 264 | |
| 265 | if (strcmp(_PATH_UTMPX, utfile) == 0) |
| 266 | if ((fp != NULL && readonly) || (fp == NULL && geteuid() != 0)) |
| 267 | return utmp_update(utx); |
| 268 | |
| 269 | |
| 270 | (void)memcpy(&temp, utx, sizeof(temp)); |
| 271 | |
| 272 | if (fp == NULL) { |
| 273 | (void)getutxent(); |
| 274 | if (fp == NULL || readonly) |
| 275 | return NULL; |
| 276 | } |
| 277 | |
| 278 | if (getutxid(&temp) == NULL) { |
| 279 | setutxent(); |
| 280 | if (getutxid(&temp) == NULL) { |
| 281 | if (lockf(fileno(fp), F_LOCK, (off_t)0) == -1) |
| 282 | return NULL; |
| 283 | gotlock++; |
| 284 | if (fseeko(fp, (off_t)0, SEEK_END) == -1) |
| 285 | goto fail; |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | if (!gotlock) { |
| 290 | /* we are not appending */ |
| 291 | if (fseeko(fp, -(off_t)sizeof(ut), SEEK_CUR) == -1) |
| 292 | return NULL; |
| 293 | } |
| 294 | |
| 295 | if (fwrite(&temp, sizeof (temp), 1, fp) != 1) |
| 296 | goto fail; |
| 297 | |
| 298 | if (fflush(fp) == -1) |
| 299 | goto fail; |
| 300 | |
| 301 | u = memcpy(&ut, &temp, sizeof(ut)); |
| 302 | fail: |
| 303 | if (gotlock) { |
| 304 | if (lockf(fileno(fp), F_ULOCK, (off_t)0) == -1) |
| 305 | return NULL; |
| 306 | } |
| 307 | return u; |
| 308 | } |
| 309 | |
| 310 | static struct utmpx * |
| 311 | utmp_update(const struct utmpx *utx) |
| 312 | { |
| 313 | char buf[sizeof(*utx) * 4 + 1]; |
| 314 | pid_t pid; |
| 315 | int status; |
| 316 | |
| 317 | _DIAGASSERT(utx != NULL); |
| 318 | |
| 319 | (void)strvisx(buf, (const char *)(const void *)utx, sizeof(*utx), |
| 320 | VIS_WHITE | VIS_NOLOCALE); |
| 321 | switch (pid = fork()) { |
| 322 | case 0: |
| 323 | (void)execl(_PATH_UTMP_UPDATE, |
| 324 | strrchr(_PATH_UTMP_UPDATE, '/') + 1, buf, NULL); |
| 325 | _exit(1); |
| 326 | /*NOTREACHED*/ |
| 327 | case -1: |
| 328 | return NULL; |
| 329 | default: |
| 330 | if (waitpid(pid, &status, 0) == -1) |
| 331 | return NULL; |
| 332 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) |
| 333 | return memcpy(&ut, utx, sizeof(ut)); |
| 334 | return NULL; |
| 335 | } |
| 336 | |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * The following are extensions and not part of the X/Open spec. |
| 341 | */ |
| 342 | void |
| 343 | updwtmpx(const char *file, const struct utmpx *utx) |
| 344 | { |
| 345 | (void)_updwtmpx(file, utx); |
| 346 | } |
| 347 | |
| 348 | int |
| 349 | _updwtmpx(const char *file, const struct utmpx *utx) |
| 350 | { |
| 351 | int fd; |
| 352 | int saved_errno; |
| 353 | struct stat st; |
| 354 | |
| 355 | _DIAGASSERT(file != NULL); |
| 356 | _DIAGASSERT(utx != NULL); |
| 357 | |
| 358 | fd = open(file, O_WRONLY|O_APPEND|O_SHLOCK|O_CLOEXEC); |
| 359 | |
| 360 | if (fd == -1) { |
| 361 | if ((fd = open(file, O_CREAT|O_WRONLY|O_EXLOCK|O_CLOEXEC, 0644)) == -1) |
| 362 | goto fail; |
| 363 | } |
| 364 | if (fstat(fd, &st) == -1) |
| 365 | goto failclose; |
| 366 | if (st.st_size == 0) { |
| 367 | /* new file, add signature record */ |
| 368 | (void)memset(&ut, 0, sizeof(ut)); |
| 369 | ut.ut_type = SIGNATURE; |
| 370 | (void)memcpy(ut.ut_user, vers, sizeof(vers)); |
| 371 | if (write(fd, &ut, sizeof(ut)) == -1) |
| 372 | goto failclose; |
| 373 | } |
| 374 | if (write(fd, utx, sizeof(*utx)) == -1) |
| 375 | goto failclose; |
| 376 | if (close(fd) == -1) |
| 377 | return -1; |
| 378 | return 0; |
| 379 | |
| 380 | failclose: |
| 381 | saved_errno = errno; |
| 382 | (void) close(fd); |
| 383 | errno = saved_errno; |
| 384 | fail: |
| 385 | return -1; |
| 386 | } |
| 387 | |
| 388 | int |
| 389 | utmpxname(const char *fname) |
| 390 | { |
| 391 | size_t len; |
| 392 | |
| 393 | _DIAGASSERT(fname != NULL); |
| 394 | |
| 395 | len = strlen(fname); |
| 396 | |
| 397 | if (len >= sizeof(utfile)) |
| 398 | return 0; |
| 399 | |
| 400 | /* must end in x! */ |
| 401 | if (fname[len - 1] != 'x') |
| 402 | return 0; |
| 403 | |
| 404 | (void)strlcpy(utfile, fname, sizeof(utfile)); |
| 405 | endutxent(); |
| 406 | return 1; |
| 407 | } |
| 408 | |
| 409 | void |
| 410 | getutmp(const struct utmpx *ux, struct utmp *u) |
| 411 | { |
| 412 | |
| 413 | _DIAGASSERT(ux != NULL); |
| 414 | _DIAGASSERT(u != NULL); |
| 415 | |
| 416 | (void)memcpy(u->ut_name, ux->ut_name, sizeof(u->ut_name)); |
| 417 | (void)memcpy(u->ut_line, ux->ut_line, sizeof(u->ut_line)); |
| 418 | (void)memcpy(u->ut_host, ux->ut_host, sizeof(u->ut_host)); |
| 419 | u->ut_time = ux->ut_tv.tv_sec; |
| 420 | } |
| 421 | |
| 422 | void |
| 423 | getutmpx(const struct utmp *u, struct utmpx *ux) |
| 424 | { |
| 425 | |
| 426 | _DIAGASSERT(ux != NULL); |
| 427 | _DIAGASSERT(u != NULL); |
| 428 | |
| 429 | (void)memcpy(ux->ut_name, u->ut_name, sizeof(u->ut_name)); |
| 430 | (void)memcpy(ux->ut_line, u->ut_line, sizeof(u->ut_line)); |
| 431 | (void)memcpy(ux->ut_host, u->ut_host, sizeof(u->ut_host)); |
| 432 | ux->ut_tv.tv_sec = u->ut_time; |
| 433 | ux->ut_tv.tv_usec = 0; |
| 434 | (void)memset(&ux->ut_ss, 0, sizeof(ux->ut_ss)); |
| 435 | ux->ut_pid = 0; |
| 436 | ux->ut_type = USER_PROCESS; |
| 437 | ux->ut_session = 0; |
| 438 | ux->ut_exit.e_termination = 0; |
| 439 | ux->ut_exit.e_exit = 0; |
| 440 | } |
| 441 | |
| 442 | struct lastlogx * |
| 443 | getlastlogx(const char *fname, uid_t uid, struct lastlogx *ll) |
| 444 | { |
| 445 | DBT key, data; |
| 446 | DB *db; |
| 447 | |
| 448 | _DIAGASSERT(fname != NULL); |
| 449 | _DIAGASSERT(ll != NULL); |
| 450 | |
| 451 | db = dbopen(fname, O_RDONLY|O_SHLOCK|O_CLOEXEC, 0, DB_HASH, NULL); |
| 452 | |
| 453 | if (db == NULL) |
| 454 | return NULL; |
| 455 | |
| 456 | key.data = &uid; |
| 457 | key.size = sizeof(uid); |
| 458 | |
| 459 | if ((db->get)(db, &key, &data, 0) != 0) |
| 460 | goto error; |
| 461 | |
| 462 | if (data.size != sizeof(*ll)) { |
| 463 | errno = EFTYPE; |
| 464 | goto error; |
| 465 | } |
| 466 | |
| 467 | if (ll == NULL) |
| 468 | if ((ll = malloc(sizeof(*ll))) == NULL) |
| 469 | goto done; |
| 470 | |
| 471 | (void)memcpy(ll, data.data, sizeof(*ll)); |
| 472 | goto done; |
| 473 | error: |
| 474 | ll = NULL; |
| 475 | done: |
| 476 | (db->close)(db); |
| 477 | return ll; |
| 478 | } |
| 479 | |
| 480 | int |
| 481 | updlastlogx(const char *fname, uid_t uid, struct lastlogx *ll) |
| 482 | { |
| 483 | DBT key, data; |
| 484 | int error = 0; |
| 485 | DB *db; |
| 486 | |
| 487 | _DIAGASSERT(fname != NULL); |
| 488 | _DIAGASSERT(ll != NULL); |
| 489 | |
| 490 | db = dbopen(fname, O_RDWR|O_CREAT|O_EXLOCK|O_CLOEXEC, 0644, DB_HASH, NULL); |
| 491 | |
| 492 | if (db == NULL) |
| 493 | return -1; |
| 494 | |
| 495 | key.data = &uid; |
| 496 | key.size = sizeof(uid); |
| 497 | data.data = ll; |
| 498 | data.size = sizeof(*ll); |
| 499 | if ((db->put)(db, &key, &data, 0) != 0) |
| 500 | error = -1; |
| 501 | |
| 502 | (db->close)(db); |
| 503 | return error; |
| 504 | } |