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/param.h> 30 #include <sys/filio.h> 31 #include <sys/mman.h> 32 #include <sys/stat.h> 33 #include <sys/syscall.h> 34 #include <sys/sysctl.h> 35 #include <sys/user.h> 36 #include <err.h> 37 #include <fcntl.h> 38 #include <grp.h> 39 #include <jail.h> 40 #include <libutil.h> 41 #include <pwd.h> 42 #include <stdbool.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 static void 49 usage(void) 50 { 51 52 fprintf(stderr, "Usage:\n" 53 "posixshmcontrol create [-m <mode>] [-l <largepage>] <path> ...\n" 54 "posixshmcontrol rm <path> ...\n" 55 "posixshmcontrol ls [-h] [-n] [-j jail]\n" 56 "posixshmcontrol dump <path> ...\n" 57 "posixshmcontrol stat [-h] [-n] <path> ...\n" 58 "posixshmcontrol truncate [-s <newlen>] <path> ...\n"); 59 } 60 61 static int 62 create_one_shm(const char *path, long mode, int idx) 63 { 64 int fd; 65 66 if (idx == -1) { 67 fd = shm_open(path, O_RDWR | O_CREAT, mode); 68 if (fd == -1) { 69 warn("create %s", path); 70 return (1); 71 } 72 } else { 73 fd = shm_create_largepage(path, O_RDWR, idx, 74 SHM_LARGEPAGE_ALLOC_DEFAULT, mode); 75 if (fd == -1) { 76 warn("shm_create_largepage %s psind %d", path, idx); 77 return (1); 78 } 79 } 80 close(fd); 81 return (0); 82 } 83 84 static int 85 create_shm(int argc, char **argv) 86 { 87 char *end; 88 size_t *pagesizes; 89 long mode; 90 uint64_t pgsz; 91 int c, i, idx, pn, ret, ret1; 92 bool printed; 93 94 mode = 0600; 95 idx = -1; 96 while ((c = getopt(argc, argv, "l:m:")) != -1) { 97 switch (c) { 98 case 'm': 99 errno = 0; 100 mode = strtol(optarg, &end, 0); 101 if (mode == 0 && errno != 0) 102 err(1, "mode"); 103 if (*end != '\0') 104 errx(1, "non-integer mode"); 105 break; 106 case 'l': 107 if (expand_number(optarg, &pgsz) == -1) 108 err(1, "size"); 109 pn = getpagesizes(NULL, 0); 110 if (pn == -1) 111 err(1, "getpagesizes"); 112 pagesizes = malloc(sizeof(size_t) * pn); 113 if (pagesizes == NULL) 114 err(1, "malloc"); 115 if (getpagesizes(pagesizes, pn) == -1) 116 err(1, "gtpagesizes"); 117 for (idx = 0; idx < pn; idx++) { 118 if (pagesizes[idx] == pgsz) 119 break; 120 } 121 if (idx == pn) { 122 fprintf(stderr, 123 "pagesize should be superpagesize, supported sizes:"); 124 printed = false; 125 for (i = 0; i < pn; i++) { 126 if (pagesizes[i] == 0 || 127 pagesizes[i] == (size_t) 128 getpagesize()) 129 continue; 130 printed = true; 131 fprintf(stderr, " %zu", pagesizes[i]); 132 } 133 if (!printed) 134 fprintf(stderr, " none"); 135 fprintf(stderr, "\n"); 136 exit(1); 137 } 138 if (pgsz == (uint64_t)getpagesize()) 139 errx(1, "pagesize should be large"); 140 free(pagesizes); 141 break; 142 case '?': 143 default: 144 usage(); 145 return (2); 146 } 147 } 148 argc -= optind; 149 argv += optind; 150 151 if (argc == 0) { 152 usage(); 153 return (2); 154 } 155 156 ret = 0; 157 for (i = 0; i < argc; i++) { 158 ret1 = create_one_shm(argv[i], mode, idx); 159 if (ret1 != 0 && ret == 0) 160 ret = ret1; 161 } 162 return (ret); 163 } 164 165 static int 166 delete_one_shm(const char *path) 167 { 168 int error, ret; 169 170 error = shm_unlink(path); 171 if (error != 0) { 172 warn("unlink of %s failed", path); 173 ret = 1; 174 } else { 175 ret = 0; 176 } 177 return (ret); 178 } 179 180 static int 181 delete_shm(int argc, char **argv) 182 { 183 int i, ret, ret1; 184 185 if (argc == 1) { 186 usage(); 187 return (2); 188 } 189 190 ret = 0; 191 for (i = 1; i < argc; i++) { 192 ret1 = delete_one_shm(argv[i]); 193 if (ret1 != 0 && ret == 0) 194 ret = ret1; 195 } 196 return (ret); 197 } 198 199 static const char listmib[] = "kern.ipc.posix_shm_list"; 200 201 static void 202 shm_decode_mode(mode_t m, char *str) 203 { 204 int i; 205 206 i = 0; 207 str[i++] = (m & S_IRUSR) != 0 ? 'r' : '-'; 208 str[i++] = (m & S_IWUSR) != 0 ? 'w' : '-'; 209 str[i++] = (m & S_IXUSR) != 0 ? 'x' : '-'; 210 str[i++] = (m & S_IRGRP) != 0 ? 'r' : '-'; 211 str[i++] = (m & S_IWGRP) != 0 ? 'w' : '-'; 212 str[i++] = (m & S_IXGRP) != 0 ? 'x' : '-'; 213 str[i++] = (m & S_IROTH) != 0 ? 'r' : '-'; 214 str[i++] = (m & S_IWOTH) != 0 ? 'w' : '-'; 215 str[i++] = (m & S_IXOTH) != 0 ? 'x' : '-'; 216 str[i] = '\0'; 217 } 218 219 static int 220 list_shm(int argc, char **argv) 221 { 222 char *buf, *bp, *ep, jailpath[MAXPATHLEN], sizebuf[8], str[10]; 223 const char *jailparam; 224 const struct kinfo_file *kif; 225 struct stat st; 226 int c, error, fd, jid, mib[3], ret; 227 size_t len, jailpathlen, miblen; 228 bool hsize, jailed, uname; 229 230 hsize = false; 231 jailed = false; 232 uname = true; 233 234 while ((c = getopt(argc, argv, "hj:n")) != -1) { 235 switch (c) { 236 case 'h': 237 hsize = true; 238 break; 239 case 'n': 240 uname = false; 241 break; 242 case 'j': 243 jid = strtoul(optarg, &ep, 10); 244 if (ep > optarg && !*ep) { 245 jailparam = "jid"; 246 jailed = jid > 0; 247 } else { 248 jailparam = "name"; 249 jailed = true; 250 } 251 if (jailed) { 252 if (jail_getv(0, jailparam, optarg, "path", 253 jailpath, NULL) < 0) { 254 if (errno == ENOENT) 255 warnx("no such jail: %s", optarg); 256 else 257 warnx("%s", jail_errmsg); 258 return (1); 259 } 260 jailpathlen = strlen(jailpath); 261 jailpath[jailpathlen] = '/'; 262 } 263 break; 264 default: 265 usage(); 266 return (2); 267 } 268 } 269 if (argc != optind) { 270 usage(); 271 return (2); 272 } 273 274 miblen = nitems(mib); 275 error = sysctlnametomib(listmib, mib, &miblen); 276 if (error == -1) { 277 warn("cannot translate %s", listmib); 278 return (1); 279 } 280 len = 0; 281 error = sysctl(mib, miblen, NULL, &len, NULL, 0); 282 if (error == -1) { 283 warn("cannot get %s length", listmib); 284 return (1); 285 } 286 len = len * 4 / 3; 287 buf = malloc(len); 288 if (buf == NULL) { 289 warn("malloc"); 290 return (1); 291 } 292 error = sysctl(mib, miblen, buf, &len, NULL, 0); 293 if (error != 0) { 294 warn("reading %s", listmib); 295 ret = 1; 296 goto out; 297 } 298 ret = 0; 299 printf("MODE \tOWNER\tGROUP\tSIZE\tPATH\n"); 300 for (bp = buf; bp < buf + len; bp += kif->kf_structsize) { 301 kif = (const struct kinfo_file *)(void *)bp; 302 if (kif->kf_structsize == 0) 303 break; 304 if (jailed && strncmp(kif->kf_path, jailpath, jailpathlen + 1)) 305 continue; 306 fd = shm_open(kif->kf_path, O_RDONLY, 0); 307 if (fd == -1) { 308 if (errno != EACCES) { 309 warn("open %s", kif->kf_path); 310 ret = 1; 311 } 312 continue; 313 } 314 error = fstat(fd, &st); 315 close(fd); 316 if (error != 0) { 317 warn("stat %s", kif->kf_path); 318 ret = 1; 319 continue; 320 } 321 shm_decode_mode(kif->kf_un.kf_file.kf_file_mode, str); 322 printf("%s\t", str); 323 if (uname) { 324 printf("%s\t%s\t", user_from_uid(st.st_uid, 0), 325 group_from_gid(st.st_gid, 0)); 326 } else { 327 printf("%d\t%d\t", st.st_uid, st.st_gid); 328 } 329 if (hsize) { 330 humanize_number(sizebuf, sizeof(sizebuf), 331 kif->kf_un.kf_file.kf_file_size, "", HN_AUTOSCALE, 332 HN_NOSPACE); 333 printf("%s\t", sizebuf); 334 } else { 335 printf("%jd\t", 336 (uintmax_t)kif->kf_un.kf_file.kf_file_size); 337 } 338 printf("%s\n", kif->kf_path); 339 } 340 out: 341 free(buf); 342 return (ret); 343 } 344 345 static int 346 read_one_shm(const char *path) 347 { 348 char buf[4096]; 349 ssize_t size, se; 350 int fd, ret; 351 352 ret = 1; 353 fd = shm_open(path, O_RDONLY, 0); 354 if (fd == -1) { 355 warn("open %s", path); 356 goto out; 357 } 358 for (;;) { 359 size = read(fd, buf, sizeof(buf)); 360 if (size > 0) { 361 se = fwrite(buf, 1, size, stdout); 362 if (se < size) { 363 warnx("short write to stdout"); 364 goto out; 365 } 366 } 367 if (size == (ssize_t)sizeof(buf)) 368 continue; 369 if (size >= 0 && size < (ssize_t)sizeof(buf)) { 370 ret = 0; 371 goto out; 372 } 373 warn("read from %s", path); 374 goto out; 375 } 376 out: 377 close(fd); 378 return (ret); 379 } 380 381 static int 382 read_shm(int argc, char **argv) 383 { 384 int i, ret, ret1; 385 386 if (argc == 1) { 387 usage(); 388 return (2); 389 } 390 391 ret = 0; 392 for (i = 1; i < argc; i++) { 393 ret1 = read_one_shm(argv[i]); 394 if (ret1 != 0 && ret == 0) 395 ret = ret1; 396 } 397 return (ret); 398 } 399 400 static int 401 stat_one_shm(const char *path, bool hsize, bool uname) 402 { 403 char sizebuf[8]; 404 struct stat st; 405 int error, fd, ret; 406 struct shm_largepage_conf conf_dummy; 407 bool largepage; 408 409 fd = shm_open(path, O_RDONLY, 0); 410 if (fd == -1) { 411 warn("open %s", path); 412 return (1); 413 } 414 ret = 0; 415 error = fstat(fd, &st); 416 if (error == -1) { 417 warn("stat %s", path); 418 ret = 1; 419 } else { 420 printf("path\t%s\n", path); 421 printf("inode\t%jd\n", (uintmax_t)st.st_ino); 422 printf("mode\t%#o\n", st.st_mode); 423 printf("nlink\t%jd\n", (uintmax_t)st.st_nlink); 424 if (uname) { 425 printf("owner\t%s\n", user_from_uid(st.st_uid, 0)); 426 printf("group\t%s\n", group_from_gid(st.st_gid, 0)); 427 } else { 428 printf("uid\t%d\n", st.st_uid); 429 printf("gid\t%d\n", st.st_gid); 430 } 431 if (hsize) { 432 humanize_number(sizebuf, sizeof(sizebuf), 433 st.st_size, "", HN_AUTOSCALE, HN_NOSPACE); 434 printf("size\t%s\n", sizebuf); 435 } else { 436 printf("size\t%jd\n", (uintmax_t)st.st_size); 437 } 438 printf("atime\t%ld.%09ld\n", (long)st.st_atime, 439 (long)st.st_atim.tv_nsec); 440 printf("mtime\t%ld.%09ld\n", (long)st.st_mtime, 441 (long)st.st_mtim.tv_nsec); 442 printf("ctime\t%ld.%09ld\n", (long)st.st_ctime, 443 (long)st.st_ctim.tv_nsec); 444 printf("birth\t%ld.%09ld\n", (long)st.st_birthtim.tv_sec, 445 (long)st.st_birthtim.tv_nsec); 446 error = ioctl(fd, FIOGSHMLPGCNF, &conf_dummy); 447 largepage = error == 0; 448 if (st.st_blocks != 0 && largepage) 449 printf("pagesz\t%jd\n", roundup((uintmax_t)st.st_size, 450 PAGE_SIZE) / st.st_blocks); 451 else 452 printf("pages\t%jd\n", st.st_blocks); 453 } 454 close(fd); 455 return (ret); 456 } 457 458 static int 459 stat_shm(int argc, char **argv) 460 { 461 int c, i, ret, ret1; 462 bool hsize, uname; 463 464 hsize = false; 465 uname = true; 466 467 while ((c = getopt(argc, argv, "hn")) != -1) { 468 switch (c) { 469 case 'h': 470 hsize = true; 471 break; 472 case 'n': 473 uname = false; 474 break; 475 default: 476 usage(); 477 return (2); 478 } 479 } 480 argc -= optind; 481 argv += optind; 482 483 if (argc == 0) { 484 usage(); 485 return (2); 486 } 487 488 ret = 0; 489 for (i = 0; i < argc; i++) { 490 ret1 = stat_one_shm(argv[i], hsize, uname); 491 if (ret1 != 0 && ret == 0) 492 ret = ret1; 493 } 494 return (ret); 495 } 496 497 static int 498 truncate_one_shm(const char *path, uint64_t newsize) 499 { 500 int error, fd, ret; 501 502 ret = 0; 503 fd = shm_open(path, O_RDWR, 0); 504 if (fd == -1) { 505 warn("open %s", path); 506 return (1); 507 } 508 error = ftruncate(fd, newsize); 509 if (error == -1) { 510 warn("truncate %s", path); 511 ret = 1; 512 } 513 close(fd); 514 return (ret); 515 } 516 517 static int 518 truncate_shm(int argc, char **argv) 519 { 520 uint64_t newsize; 521 int c, i, ret, ret1; 522 523 newsize = 0; 524 while ((c = getopt(argc, argv, "s:")) != -1) { 525 switch (c) { 526 case 's': 527 if (expand_number(optarg, &newsize) == -1) 528 err(1, "size"); 529 break; 530 case '?': 531 default: 532 return (2); 533 } 534 } 535 argc -= optind; 536 argv += optind; 537 538 if (argc == 0) { 539 usage(); 540 return (2); 541 } 542 543 ret = 0; 544 for (i = 0; i < argc; i++) { 545 ret1 = truncate_one_shm(argv[i], newsize); 546 if (ret1 != 0 && ret == 0) 547 ret = ret1; 548 } 549 return (ret); 550 } 551 552 struct opmode { 553 const char *cmd; 554 int (*impl)(int argc, char **argv); 555 }; 556 557 static const struct opmode opmodes[] = { 558 { .cmd = "create", .impl = create_shm}, 559 { .cmd = "rm", .impl = delete_shm, }, 560 { .cmd = "list", .impl = list_shm }, 561 { .cmd = "ls", .impl = list_shm }, 562 { .cmd = "dump", .impl = read_shm, }, 563 { .cmd = "stat", .impl = stat_shm, }, 564 { .cmd = "truncate", .impl = truncate_shm, }, 565 }; 566 567 int 568 main(int argc, char *argv[]) 569 { 570 const struct opmode *opmode; 571 int i, ret; 572 573 ret = 0; 574 opmode = NULL; 575 576 if (argc < 2) { 577 usage(); 578 exit(2); 579 } 580 for (i = 0; i < (int)nitems(opmodes); i++) { 581 if (strcmp(argv[1], opmodes[i].cmd) == 0) { 582 opmode = &opmodes[i]; 583 break; 584 } 585 } 586 if (opmode == NULL) { 587 usage(); 588 exit(2); 589 } 590 ret = opmode->impl(argc - 1, argv + 1); 591 exit(ret); 592 } 593