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 #include <sys/param.h> 31 #include <sys/filio.h> 32 #include <sys/mman.h> 33 #include <sys/stat.h> 34 #include <sys/syscall.h> 35 #include <sys/sysctl.h> 36 #include <sys/user.h> 37 #include <err.h> 38 #include <fcntl.h> 39 #include <grp.h> 40 #include <jail.h> 41 #include <libutil.h> 42 #include <pwd.h> 43 #include <stdbool.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 static void 50 usage(void) 51 { 52 53 fprintf(stderr, "Usage:\n" 54 "posixshmcontrol create [-m <mode>] [-l <largepage>] <path> ...\n" 55 "posixshmcontrol rm <path> ...\n" 56 "posixshmcontrol ls [-h] [-n] [-j jail]\n" 57 "posixshmcontrol dump <path> ...\n" 58 "posixshmcontrol stat [-h] [-n] <path> ...\n" 59 "posixshmcontrol truncate [-s <newlen>] <path> ...\n"); 60 } 61 62 static int 63 create_one_shm(const char *path, long mode, int idx) 64 { 65 int fd; 66 67 if (idx == -1) { 68 fd = shm_open(path, O_RDWR | O_CREAT, mode); 69 if (fd == -1) { 70 warn("create %s", path); 71 return (1); 72 } 73 } else { 74 fd = shm_create_largepage(path, O_RDWR, idx, 75 SHM_LARGEPAGE_ALLOC_DEFAULT, mode); 76 if (fd == -1) { 77 warn("shm_create_largepage %s psind %d", path, idx); 78 return (1); 79 } 80 } 81 close(fd); 82 return (0); 83 } 84 85 static int 86 create_shm(int argc, char **argv) 87 { 88 char *end; 89 size_t *pagesizes; 90 long mode; 91 uint64_t pgsz; 92 int c, i, idx, pn, ret, ret1; 93 bool printed; 94 95 mode = 0600; 96 idx = -1; 97 while ((c = getopt(argc, argv, "l:m:")) != -1) { 98 switch (c) { 99 case 'm': 100 errno = 0; 101 mode = strtol(optarg, &end, 0); 102 if (mode == 0 && errno != 0) 103 err(1, "mode"); 104 if (*end != '\0') 105 errx(1, "non-integer mode"); 106 break; 107 case 'l': 108 if (expand_number(optarg, &pgsz) == -1) 109 err(1, "size"); 110 pn = getpagesizes(NULL, 0); 111 if (pn == -1) 112 err(1, "getpagesizes"); 113 pagesizes = malloc(sizeof(size_t) * pn); 114 if (pagesizes == NULL) 115 err(1, "malloc"); 116 if (getpagesizes(pagesizes, pn) == -1) 117 err(1, "gtpagesizes"); 118 for (idx = 0; idx < pn; idx++) { 119 if (pagesizes[idx] == pgsz) 120 break; 121 } 122 if (idx == pn) { 123 fprintf(stderr, 124 "pagesize should be superpagesize, supported sizes:"); 125 printed = false; 126 for (i = 0; i < pn; i++) { 127 if (pagesizes[i] == 0 || 128 pagesizes[i] == (size_t) 129 getpagesize()) 130 continue; 131 printed = true; 132 fprintf(stderr, " %zu", pagesizes[i]); 133 } 134 if (!printed) 135 fprintf(stderr, " none"); 136 fprintf(stderr, "\n"); 137 exit(1); 138 } 139 if (pgsz == (uint64_t)getpagesize()) 140 errx(1, "pagesize should be large"); 141 free(pagesizes); 142 break; 143 case '?': 144 default: 145 usage(); 146 return (2); 147 } 148 } 149 argc -= optind; 150 argv += optind; 151 152 if (argc == 0) { 153 usage(); 154 return (2); 155 } 156 157 ret = 0; 158 for (i = 0; i < argc; i++) { 159 ret1 = create_one_shm(argv[i], mode, idx); 160 if (ret1 != 0 && ret == 0) 161 ret = ret1; 162 } 163 return (ret); 164 } 165 166 static int 167 delete_one_shm(const char *path) 168 { 169 int error, ret; 170 171 error = shm_unlink(path); 172 if (error != 0) { 173 warn("unlink of %s failed", path); 174 ret = 1; 175 } else { 176 ret = 0; 177 } 178 return (ret); 179 } 180 181 static int 182 delete_shm(int argc, char **argv) 183 { 184 int i, ret, ret1; 185 186 if (argc == 1) { 187 usage(); 188 return (2); 189 } 190 191 ret = 0; 192 for (i = 1; i < argc; i++) { 193 ret1 = delete_one_shm(argv[i]); 194 if (ret1 != 0 && ret == 0) 195 ret = ret1; 196 } 197 return (ret); 198 } 199 200 static const char listmib[] = "kern.ipc.posix_shm_list"; 201 202 static void 203 shm_decode_mode(mode_t m, char *str) 204 { 205 int i; 206 207 i = 0; 208 str[i++] = (m & S_IRUSR) != 0 ? 'r' : '-'; 209 str[i++] = (m & S_IWUSR) != 0 ? 'w' : '-'; 210 str[i++] = (m & S_IXUSR) != 0 ? 'x' : '-'; 211 str[i++] = (m & S_IRGRP) != 0 ? 'r' : '-'; 212 str[i++] = (m & S_IWGRP) != 0 ? 'w' : '-'; 213 str[i++] = (m & S_IXGRP) != 0 ? 'x' : '-'; 214 str[i++] = (m & S_IROTH) != 0 ? 'r' : '-'; 215 str[i++] = (m & S_IWOTH) != 0 ? 'w' : '-'; 216 str[i++] = (m & S_IXOTH) != 0 ? 'x' : '-'; 217 str[i] = '\0'; 218 } 219 220 static int 221 list_shm(int argc, char **argv) 222 { 223 char *buf, *bp, *ep, jailpath[MAXPATHLEN], sizebuf[8], str[10]; 224 const char *jailparam; 225 const struct kinfo_file *kif; 226 struct stat st; 227 int c, error, fd, jid, mib[3], ret; 228 size_t len, jailpathlen, miblen; 229 bool hsize, jailed, uname; 230 231 hsize = false; 232 jailed = false; 233 uname = true; 234 235 while ((c = getopt(argc, argv, "hj:n")) != -1) { 236 switch (c) { 237 case 'h': 238 hsize = true; 239 break; 240 case 'n': 241 uname = false; 242 break; 243 case 'j': 244 jid = strtoul(optarg, &ep, 10); 245 if (ep > optarg && !*ep) { 246 jailparam = "jid"; 247 jailed = jid > 0; 248 } else { 249 jailparam = "name"; 250 jailed = true; 251 } 252 if (jailed) { 253 if (jail_getv(0, jailparam, optarg, "path", 254 jailpath, NULL) < 0) { 255 if (errno == ENOENT) 256 warnx("no such jail: %s", optarg); 257 else 258 warnx("%s", jail_errmsg); 259 return (1); 260 } 261 jailpathlen = strlen(jailpath); 262 jailpath[jailpathlen] = '/'; 263 } 264 break; 265 default: 266 usage(); 267 return (2); 268 } 269 } 270 if (argc != optind) { 271 usage(); 272 return (2); 273 } 274 275 miblen = nitems(mib); 276 error = sysctlnametomib(listmib, mib, &miblen); 277 if (error == -1) { 278 warn("cannot translate %s", listmib); 279 return (1); 280 } 281 len = 0; 282 error = sysctl(mib, miblen, NULL, &len, NULL, 0); 283 if (error == -1) { 284 warn("cannot get %s length", listmib); 285 return (1); 286 } 287 len = len * 4 / 3; 288 buf = malloc(len); 289 if (buf == NULL) { 290 warn("malloc"); 291 return (1); 292 } 293 error = sysctl(mib, miblen, buf, &len, NULL, 0); 294 if (error != 0) { 295 warn("reading %s", listmib); 296 ret = 1; 297 goto out; 298 } 299 ret = 0; 300 printf("MODE \tOWNER\tGROUP\tSIZE\tPATH\n"); 301 for (bp = buf; bp < buf + len; bp += kif->kf_structsize) { 302 kif = (const struct kinfo_file *)(void *)bp; 303 if (kif->kf_structsize == 0) 304 break; 305 if (jailed && strncmp(kif->kf_path, jailpath, jailpathlen + 1)) 306 continue; 307 fd = shm_open(kif->kf_path, O_RDONLY, 0); 308 if (fd == -1) { 309 if (errno != EACCES) { 310 warn("open %s", kif->kf_path); 311 ret = 1; 312 } 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 struct shm_largepage_conf conf_dummy; 408 bool largepage; 409 410 fd = shm_open(path, O_RDONLY, 0); 411 if (fd == -1) { 412 warn("open %s", path); 413 return (1); 414 } 415 ret = 0; 416 error = fstat(fd, &st); 417 if (error == -1) { 418 warn("stat %s", path); 419 ret = 1; 420 } else { 421 printf("path\t%s\n", path); 422 printf("inode\t%jd\n", (uintmax_t)st.st_ino); 423 printf("mode\t%#o\n", st.st_mode); 424 printf("nlink\t%jd\n", (uintmax_t)st.st_nlink); 425 if (uname) { 426 printf("owner\t%s\n", user_from_uid(st.st_uid, 0)); 427 printf("group\t%s\n", group_from_gid(st.st_gid, 0)); 428 } else { 429 printf("uid\t%d\n", st.st_uid); 430 printf("gid\t%d\n", st.st_gid); 431 } 432 if (hsize) { 433 humanize_number(sizebuf, sizeof(sizebuf), 434 st.st_size, "", HN_AUTOSCALE, HN_NOSPACE); 435 printf("size\t%s\n", sizebuf); 436 } else { 437 printf("size\t%jd\n", (uintmax_t)st.st_size); 438 } 439 printf("atime\t%ld.%09ld\n", (long)st.st_atime, 440 (long)st.st_atim.tv_nsec); 441 printf("mtime\t%ld.%09ld\n", (long)st.st_mtime, 442 (long)st.st_mtim.tv_nsec); 443 printf("ctime\t%ld.%09ld\n", (long)st.st_ctime, 444 (long)st.st_ctim.tv_nsec); 445 printf("birth\t%ld.%09ld\n", (long)st.st_birthtim.tv_sec, 446 (long)st.st_birthtim.tv_nsec); 447 error = ioctl(fd, FIOGSHMLPGCNF, &conf_dummy); 448 largepage = error == 0; 449 if (st.st_blocks != 0 && largepage) 450 printf("pagesz\t%jd\n", roundup((uintmax_t)st.st_size, 451 PAGE_SIZE) / st.st_blocks); 452 else 453 printf("pages\t%jd\n", st.st_blocks); 454 } 455 close(fd); 456 return (ret); 457 } 458 459 static int 460 stat_shm(int argc, char **argv) 461 { 462 int c, i, ret, ret1; 463 bool hsize, uname; 464 465 hsize = false; 466 uname = true; 467 468 while ((c = getopt(argc, argv, "hn")) != -1) { 469 switch (c) { 470 case 'h': 471 hsize = true; 472 break; 473 case 'n': 474 uname = false; 475 break; 476 default: 477 usage(); 478 return (2); 479 } 480 } 481 argc -= optind; 482 argv += optind; 483 484 if (argc == 0) { 485 usage(); 486 return (2); 487 } 488 489 ret = 0; 490 for (i = 0; i < argc; i++) { 491 ret1 = stat_one_shm(argv[i], hsize, uname); 492 if (ret1 != 0 && ret == 0) 493 ret = ret1; 494 } 495 return (ret); 496 } 497 498 static int 499 truncate_one_shm(const char *path, uint64_t newsize) 500 { 501 int error, fd, ret; 502 503 ret = 0; 504 fd = shm_open(path, O_RDWR, 0); 505 if (fd == -1) { 506 warn("open %s", path); 507 return (1); 508 } 509 error = ftruncate(fd, newsize); 510 if (error == -1) { 511 warn("truncate %s", path); 512 ret = 1; 513 } 514 close(fd); 515 return (ret); 516 } 517 518 static int 519 truncate_shm(int argc, char **argv) 520 { 521 uint64_t newsize; 522 int c, i, ret, ret1; 523 524 newsize = 0; 525 while ((c = getopt(argc, argv, "s:")) != -1) { 526 switch (c) { 527 case 's': 528 if (expand_number(optarg, &newsize) == -1) 529 err(1, "size"); 530 break; 531 case '?': 532 default: 533 return (2); 534 } 535 } 536 argc -= optind; 537 argv += optind; 538 539 if (argc == 0) { 540 usage(); 541 return (2); 542 } 543 544 ret = 0; 545 for (i = 0; i < argc; i++) { 546 ret1 = truncate_one_shm(argv[i], newsize); 547 if (ret1 != 0 && ret == 0) 548 ret = ret1; 549 } 550 return (ret); 551 } 552 553 struct opmode { 554 const char *cmd; 555 int (*impl)(int argc, char **argv); 556 }; 557 558 static const struct opmode opmodes[] = { 559 { .cmd = "create", .impl = create_shm}, 560 { .cmd = "rm", .impl = delete_shm, }, 561 { .cmd = "list", .impl = list_shm }, 562 { .cmd = "ls", .impl = list_shm }, 563 { .cmd = "dump", .impl = read_shm, }, 564 { .cmd = "stat", .impl = stat_shm, }, 565 { .cmd = "truncate", .impl = truncate_shm, }, 566 }; 567 568 int 569 main(int argc, char *argv[]) 570 { 571 const struct opmode *opmode; 572 int i, ret; 573 574 ret = 0; 575 opmode = NULL; 576 577 if (argc < 2) { 578 usage(); 579 exit(2); 580 } 581 for (i = 0; i < (int)nitems(opmodes); i++) { 582 if (strcmp(argv[1], opmodes[i].cmd) == 0) { 583 opmode = &opmodes[i]; 584 break; 585 } 586 } 587 if (opmode == NULL) { 588 usage(); 589 exit(2); 590 } 591 ret = opmode->impl(argc - 1, argv + 1); 592 exit(ret); 593 } 594