1 /*- 2 * Copyright (c) 2019 The FreeBSD Foundation 3 * 4 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 5 * under sponsorship from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/filio.h> 34 #include <sys/mman.h> 35 #include <sys/stat.h> 36 #include <sys/syscall.h> 37 #include <sys/sysctl.h> 38 #include <sys/user.h> 39 #include <err.h> 40 #include <fcntl.h> 41 #include <grp.h> 42 #include <jail.h> 43 #include <libutil.h> 44 #include <pwd.h> 45 #include <stdbool.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 static void 52 usage(void) 53 { 54 55 fprintf(stderr, "Usage:\n" 56 "posixshmcontrol create [-m <mode>] [-l <largepage>] <path> ...\n" 57 "posixshmcontrol rm <path> ...\n" 58 "posixshmcontrol ls [-h] [-n] [-j jail]\n" 59 "posixshmcontrol dump <path> ...\n" 60 "posixshmcontrol stat [-h] [-n] <path> ...\n" 61 "posixshmcontrol truncate [-s <newlen>] <path> ...\n"); 62 } 63 64 static int 65 create_one_shm(const char *path, long mode, int idx) 66 { 67 int fd; 68 69 if (idx == -1) { 70 fd = shm_open(path, O_RDWR | O_CREAT, mode); 71 if (fd == -1) { 72 warn("create %s", path); 73 return (1); 74 } 75 } else { 76 fd = shm_create_largepage(path, O_RDWR, idx, 77 SHM_LARGEPAGE_ALLOC_DEFAULT, mode); 78 if (fd == -1) { 79 warn("shm_create_largepage %s psind %d", path, idx); 80 return (1); 81 } 82 } 83 close(fd); 84 return (0); 85 } 86 87 static int 88 create_shm(int argc, char **argv) 89 { 90 char *end; 91 size_t *pagesizes; 92 long mode; 93 uint64_t pgsz; 94 int c, i, idx, pn, ret, ret1; 95 bool printed; 96 97 mode = 0600; 98 idx = -1; 99 while ((c = getopt(argc, argv, "l:m:")) != -1) { 100 switch (c) { 101 case 'm': 102 errno = 0; 103 mode = strtol(optarg, &end, 0); 104 if (mode == 0 && errno != 0) 105 err(1, "mode"); 106 if (*end != '\0') 107 errx(1, "non-integer mode"); 108 break; 109 case 'l': 110 if (expand_number(optarg, &pgsz) == -1) 111 err(1, "size"); 112 pn = getpagesizes(NULL, 0); 113 if (pn == -1) 114 err(1, "getpagesizes"); 115 pagesizes = malloc(sizeof(size_t) * pn); 116 if (pagesizes == NULL) 117 err(1, "malloc"); 118 if (getpagesizes(pagesizes, pn) == -1) 119 err(1, "gtpagesizes"); 120 for (idx = 0; idx < pn; idx++) { 121 if (pagesizes[idx] == pgsz) 122 break; 123 } 124 if (idx == pn) { 125 fprintf(stderr, 126 "pagesize should be superpagesize, supported sizes:"); 127 printed = false; 128 for (i = 0; i < pn; i++) { 129 if (pagesizes[i] == 0 || 130 pagesizes[i] == (size_t) 131 getpagesize()) 132 continue; 133 printed = true; 134 fprintf(stderr, " %zu", pagesizes[i]); 135 } 136 if (!printed) 137 fprintf(stderr, " none"); 138 fprintf(stderr, "\n"); 139 exit(1); 140 } 141 if (pgsz == (uint64_t)getpagesize()) 142 errx(1, "pagesize should be large"); 143 free(pagesizes); 144 break; 145 case '?': 146 default: 147 usage(); 148 return (2); 149 } 150 } 151 argc -= optind; 152 argv += optind; 153 154 if (argc == 0) { 155 usage(); 156 return (2); 157 } 158 159 ret = 0; 160 for (i = 0; i < argc; i++) { 161 ret1 = create_one_shm(argv[i], mode, idx); 162 if (ret1 != 0 && ret == 0) 163 ret = ret1; 164 } 165 return (ret); 166 } 167 168 static int 169 delete_one_shm(const char *path) 170 { 171 int error, ret; 172 173 error = shm_unlink(path); 174 if (error != 0) { 175 warn("unlink of %s failed", path); 176 ret = 1; 177 } else { 178 ret = 0; 179 } 180 return (ret); 181 } 182 183 static int 184 delete_shm(int argc, char **argv) 185 { 186 int i, ret, ret1; 187 188 if (argc == 1) { 189 usage(); 190 return (2); 191 } 192 193 ret = 0; 194 for (i = 1; i < argc; i++) { 195 ret1 = delete_one_shm(argv[i]); 196 if (ret1 != 0 && ret == 0) 197 ret = ret1; 198 } 199 return (ret); 200 } 201 202 static const char listmib[] = "kern.ipc.posix_shm_list"; 203 204 static void 205 shm_decode_mode(mode_t m, char *str) 206 { 207 int i; 208 209 i = 0; 210 str[i++] = (m & S_IRUSR) != 0 ? 'r' : '-'; 211 str[i++] = (m & S_IWUSR) != 0 ? 'w' : '-'; 212 str[i++] = (m & S_IXUSR) != 0 ? 'x' : '-'; 213 str[i++] = (m & S_IRGRP) != 0 ? 'r' : '-'; 214 str[i++] = (m & S_IWGRP) != 0 ? 'w' : '-'; 215 str[i++] = (m & S_IXGRP) != 0 ? 'x' : '-'; 216 str[i++] = (m & S_IROTH) != 0 ? 'r' : '-'; 217 str[i++] = (m & S_IWOTH) != 0 ? 'w' : '-'; 218 str[i++] = (m & S_IXOTH) != 0 ? 'x' : '-'; 219 str[i] = '\0'; 220 } 221 222 static int 223 list_shm(int argc, char **argv) 224 { 225 char *buf, *bp, *ep, jailpath[MAXPATHLEN], sizebuf[8], str[10]; 226 const char *jailparam; 227 const struct kinfo_file *kif; 228 struct stat st; 229 int c, error, fd, jid, mib[3], ret; 230 size_t len, jailpathlen, miblen; 231 bool hsize, jailed, uname; 232 233 hsize = false; 234 jailed = false; 235 uname = true; 236 237 while ((c = getopt(argc, argv, "hj:n")) != -1) { 238 switch (c) { 239 case 'h': 240 hsize = true; 241 break; 242 case 'n': 243 uname = false; 244 break; 245 case 'j': 246 jid = strtoul(optarg, &ep, 10); 247 if (ep > optarg && !*ep) { 248 jailparam = "jid"; 249 jailed = jid > 0; 250 } else { 251 jailparam = "name"; 252 jailed = true; 253 } 254 if (jailed) { 255 if (jail_getv(0, jailparam, optarg, "path", 256 jailpath, NULL) < 0) { 257 if (errno == ENOENT) 258 warnx("no such jail: %s", optarg); 259 else 260 warnx("%s", jail_errmsg); 261 return (1); 262 } 263 jailpathlen = strlen(jailpath); 264 jailpath[jailpathlen] = '/'; 265 } 266 break; 267 default: 268 usage(); 269 return (2); 270 } 271 } 272 if (argc != optind) { 273 usage(); 274 return (2); 275 } 276 277 miblen = nitems(mib); 278 error = sysctlnametomib(listmib, mib, &miblen); 279 if (error == -1) { 280 warn("cannot translate %s", listmib); 281 return (1); 282 } 283 len = 0; 284 error = sysctl(mib, miblen, NULL, &len, NULL, 0); 285 if (error == -1) { 286 warn("cannot get %s length", listmib); 287 return (1); 288 } 289 len = len * 4 / 3; 290 buf = malloc(len); 291 if (buf == NULL) { 292 warn("malloc"); 293 return (1); 294 } 295 error = sysctl(mib, miblen, buf, &len, NULL, 0); 296 if (error != 0) { 297 warn("reading %s", listmib); 298 ret = 1; 299 goto out; 300 } 301 ret = 0; 302 printf("MODE \tOWNER\tGROUP\tSIZE\tPATH\n"); 303 for (bp = buf; bp < buf + len; bp += kif->kf_structsize) { 304 kif = (const struct kinfo_file *)(void *)bp; 305 if (kif->kf_structsize == 0) 306 break; 307 if (jailed && strncmp(kif->kf_path, jailpath, jailpathlen + 1)) 308 continue; 309 fd = shm_open(kif->kf_path, O_RDONLY, 0); 310 if (fd == -1) { 311 warn("open %s", kif->kf_path); 312 ret = 1; 313 continue; 314 } 315 error = fstat(fd, &st); 316 close(fd); 317 if (error != 0) { 318 warn("stat %s", kif->kf_path); 319 ret = 1; 320 continue; 321 } 322 shm_decode_mode(kif->kf_un.kf_file.kf_file_mode, str); 323 printf("%s\t", str); 324 if (uname) { 325 printf("%s\t%s\t", user_from_uid(st.st_uid, 0), 326 group_from_gid(st.st_gid, 0)); 327 } else { 328 printf("%d\t%d\t", st.st_uid, st.st_gid); 329 } 330 if (hsize) { 331 humanize_number(sizebuf, sizeof(sizebuf), 332 kif->kf_un.kf_file.kf_file_size, "", HN_AUTOSCALE, 333 HN_NOSPACE); 334 printf("%s\t", sizebuf); 335 } else { 336 printf("%jd\t", 337 (uintmax_t)kif->kf_un.kf_file.kf_file_size); 338 } 339 printf("%s\n", kif->kf_path); 340 } 341 out: 342 free(buf); 343 return (ret); 344 } 345 346 static int 347 read_one_shm(const char *path) 348 { 349 char buf[4096]; 350 ssize_t size, se; 351 int fd, ret; 352 353 ret = 1; 354 fd = shm_open(path, O_RDONLY, 0); 355 if (fd == -1) { 356 warn("open %s", path); 357 goto out; 358 } 359 for (;;) { 360 size = read(fd, buf, sizeof(buf)); 361 if (size > 0) { 362 se = fwrite(buf, 1, size, stdout); 363 if (se < size) { 364 warnx("short write to stdout"); 365 goto out; 366 } 367 } 368 if (size == (ssize_t)sizeof(buf)) 369 continue; 370 if (size >= 0 && size < (ssize_t)sizeof(buf)) { 371 ret = 0; 372 goto out; 373 } 374 warn("read from %s", path); 375 goto out; 376 } 377 out: 378 close(fd); 379 return (ret); 380 } 381 382 static int 383 read_shm(int argc, char **argv) 384 { 385 int i, ret, ret1; 386 387 if (argc == 1) { 388 usage(); 389 return (2); 390 } 391 392 ret = 0; 393 for (i = 1; i < argc; i++) { 394 ret1 = read_one_shm(argv[i]); 395 if (ret1 != 0 && ret == 0) 396 ret = ret1; 397 } 398 return (ret); 399 } 400 401 static int 402 stat_one_shm(const char *path, bool hsize, bool uname) 403 { 404 char sizebuf[8]; 405 struct stat st; 406 int error, fd, ret; 407 408 fd = shm_open(path, O_RDONLY, 0); 409 if (fd == -1) { 410 warn("open %s", path); 411 return (1); 412 } 413 ret = 0; 414 error = fstat(fd, &st); 415 if (error == -1) { 416 warn("stat %s", path); 417 ret = 1; 418 } else { 419 printf("path\t%s\n", path); 420 printf("inode\t%jd\n", (uintmax_t)st.st_ino); 421 printf("mode\t%#o\n", st.st_mode); 422 printf("nlink\t%jd\n", (uintmax_t)st.st_nlink); 423 if (uname) { 424 printf("owner\t%s\n", user_from_uid(st.st_uid, 0)); 425 printf("group\t%s\n", group_from_gid(st.st_gid, 0)); 426 } else { 427 printf("uid\t%d\n", st.st_uid); 428 printf("gid\t%d\n", st.st_gid); 429 } 430 if (hsize) { 431 humanize_number(sizebuf, sizeof(sizebuf), 432 st.st_size, "", HN_AUTOSCALE, HN_NOSPACE); 433 printf("size\t%s\n", sizebuf); 434 } else { 435 printf("size\t%jd\n", (uintmax_t)st.st_size); 436 } 437 printf("atime\t%ld.%09ld\n", (long)st.st_atime, 438 (long)st.st_atim.tv_nsec); 439 printf("mtime\t%ld.%09ld\n", (long)st.st_mtime, 440 (long)st.st_mtim.tv_nsec); 441 printf("ctime\t%ld.%09ld\n", (long)st.st_ctime, 442 (long)st.st_ctim.tv_nsec); 443 printf("birth\t%ld.%09ld\n", (long)st.st_birthtim.tv_sec, 444 (long)st.st_birthtim.tv_nsec); 445 if (st.st_blocks != 0) 446 printf("pagesz\t%jd\n", roundup((uintmax_t)st.st_size, 447 PAGE_SIZE) / st.st_blocks); 448 } 449 close(fd); 450 return (ret); 451 } 452 453 static int 454 stat_shm(int argc, char **argv) 455 { 456 int c, i, ret, ret1; 457 bool hsize, uname; 458 459 hsize = false; 460 uname = true; 461 462 while ((c = getopt(argc, argv, "hn")) != -1) { 463 switch (c) { 464 case 'h': 465 hsize = true; 466 break; 467 case 'n': 468 uname = false; 469 break; 470 default: 471 usage(); 472 return (2); 473 } 474 } 475 argc -= optind; 476 argv += optind; 477 478 if (argc == 0) { 479 usage(); 480 return (2); 481 } 482 483 ret = 0; 484 for (i = 0; i < argc; i++) { 485 ret1 = stat_one_shm(argv[i], hsize, uname); 486 if (ret1 != 0 && ret == 0) 487 ret = ret1; 488 } 489 return (ret); 490 } 491 492 static int 493 truncate_one_shm(const char *path, uint64_t newsize) 494 { 495 int error, fd, ret; 496 497 ret = 0; 498 fd = shm_open(path, O_RDWR, 0); 499 if (fd == -1) { 500 warn("open %s", path); 501 return (1); 502 } 503 error = ftruncate(fd, newsize); 504 if (error == -1) { 505 warn("truncate %s", path); 506 ret = 1; 507 } 508 close(fd); 509 return (ret); 510 } 511 512 static int 513 truncate_shm(int argc, char **argv) 514 { 515 uint64_t newsize; 516 int c, i, ret, ret1; 517 518 newsize = 0; 519 while ((c = getopt(argc, argv, "s:")) != -1) { 520 switch (c) { 521 case 's': 522 if (expand_number(optarg, &newsize) == -1) 523 err(1, "size"); 524 break; 525 case '?': 526 default: 527 return (2); 528 } 529 } 530 argc -= optind; 531 argv += optind; 532 533 if (argc == 0) { 534 usage(); 535 return (2); 536 } 537 538 ret = 0; 539 for (i = 0; i < argc; i++) { 540 ret1 = truncate_one_shm(argv[i], newsize); 541 if (ret1 != 0 && ret == 0) 542 ret = ret1; 543 } 544 return (ret); 545 } 546 547 struct opmode { 548 const char *cmd; 549 int (*impl)(int argc, char **argv); 550 }; 551 552 static const struct opmode opmodes[] = { 553 { .cmd = "create", .impl = create_shm}, 554 { .cmd = "rm", .impl = delete_shm, }, 555 { .cmd = "list", .impl = list_shm }, 556 { .cmd = "ls", .impl = list_shm }, 557 { .cmd = "dump", .impl = read_shm, }, 558 { .cmd = "stat", .impl = stat_shm, }, 559 { .cmd = "truncate", .impl = truncate_shm, }, 560 }; 561 562 int 563 main(int argc, char *argv[]) 564 { 565 const struct opmode *opmode; 566 int i, ret; 567 568 ret = 0; 569 opmode = NULL; 570 571 if (argc < 2) { 572 usage(); 573 exit(2); 574 } 575 for (i = 0; i < (int)nitems(opmodes); i++) { 576 if (strcmp(argv[1], opmodes[i].cmd) == 0) { 577 opmode = &opmodes[i]; 578 break; 579 } 580 } 581 if (opmode == NULL) { 582 usage(); 583 exit(2); 584 } 585 ret = opmode->impl(argc - 1, argv + 1); 586 exit(ret); 587 } 588