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/mman.h> 34 #include <sys/stat.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 <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>] <path> ...\n" 54 "posixshmcontrol rm <path> ...\n" 55 "posixshmcontrol ls [-h] [-n]\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) 63 { 64 int fd; 65 66 fd = shm_open(path, O_RDWR | O_CREAT, mode); 67 if (fd == -1) { 68 warn("create %s", path); 69 return (1); 70 } 71 close(fd); 72 return (0); 73 } 74 75 static int 76 create_shm(int argc, char **argv) 77 { 78 char *end; 79 long mode; 80 int c, i, ret, ret1; 81 82 mode = 0600; 83 while ((c = getopt(argc, argv, "m:")) != -1) { 84 switch (c) { 85 case 'm': 86 errno = 0; 87 mode = strtol(optarg, &end, 0); 88 if (mode == 0 && errno != 0) 89 err(1, "mode:"); 90 if (*end != '\0') 91 errx(1, "non-integer mode"); 92 break; 93 case '?': 94 default: 95 usage(); 96 return (2); 97 } 98 } 99 100 argc -= optind; 101 argv += optind; 102 ret = 0; 103 for (i = 0; i < argc; i++) { 104 ret1 = create_one_shm(argv[i], mode); 105 if (ret1 != 0 && ret == 0) 106 ret = ret1; 107 } 108 return (ret); 109 } 110 111 static int 112 delete_one_shm(const char *path) 113 { 114 int error, ret; 115 116 error = shm_unlink(path); 117 if (error != 0) { 118 warn("unlink of %s failed", path); 119 ret = 1; 120 } else { 121 ret = 0; 122 } 123 return (ret); 124 } 125 126 static int 127 delete_shm(int argc, char **argv) 128 { 129 int i, ret, ret1; 130 131 ret = 0; 132 for (i = 1; i < argc; i++) { 133 ret1 = delete_one_shm(argv[i]); 134 if (ret1 != 0 && ret == 0) 135 ret = ret1; 136 } 137 return (ret); 138 } 139 140 static const char listmib[] = "kern.ipc.posix_shm_list"; 141 142 static void 143 shm_decode_mode(mode_t m, char *str) 144 { 145 int i; 146 147 i = 0; 148 str[i++] = (m & S_IRUSR) != 0 ? 'r' : '-'; 149 str[i++] = (m & S_IWUSR) != 0 ? 'w' : '-'; 150 str[i++] = (m & S_IXUSR) != 0 ? 'x' : '-'; 151 str[i++] = (m & S_IRGRP) != 0 ? 'r' : '-'; 152 str[i++] = (m & S_IWGRP) != 0 ? 'w' : '-'; 153 str[i++] = (m & S_IXGRP) != 0 ? 'x' : '-'; 154 str[i++] = (m & S_IROTH) != 0 ? 'r' : '-'; 155 str[i++] = (m & S_IWOTH) != 0 ? 'w' : '-'; 156 str[i++] = (m & S_IXOTH) != 0 ? 'x' : '-'; 157 str[i] = '\0'; 158 } 159 160 static int 161 list_shm(int argc, char **argv) 162 { 163 char *buf, *bp, sizebuf[8], str[10]; 164 const struct kinfo_file *kif; 165 struct stat st; 166 int c, error, fd, mib[3], ret; 167 size_t len, miblen; 168 bool hsize, uname; 169 170 hsize = false; 171 uname = true; 172 173 while ((c = getopt(argc, argv, "hn")) != -1) { 174 switch (c) { 175 case 'h': 176 hsize = true; 177 break; 178 case 'n': 179 uname = false; 180 break; 181 default: 182 usage(); 183 return (2); 184 } 185 } 186 if (argc != optind) { 187 usage(); 188 return (2); 189 } 190 191 miblen = nitems(mib); 192 error = sysctlnametomib(listmib, mib, &miblen); 193 if (error == -1) { 194 warn("cannot translate %s", listmib); 195 return (1); 196 } 197 len = 0; 198 error = sysctl(mib, miblen, NULL, &len, NULL, 0); 199 if (error == -1) { 200 warn("cannot get %s length", listmib); 201 return (1); 202 } 203 len = len * 4 / 3; 204 buf = malloc(len); 205 if (buf == NULL) { 206 warn("malloc"); 207 return (1); 208 } 209 error = sysctl(mib, miblen, buf, &len, NULL, 0); 210 if (error != 0) { 211 warn("reading %s", listmib); 212 ret = 1; 213 goto out; 214 } 215 ret = 0; 216 printf("MODE \tOWNER\tGROUP\tSIZE\tPATH\n"); 217 for (bp = buf; bp < buf + len; bp += kif->kf_structsize) { 218 kif = (const struct kinfo_file *)(void *)bp; 219 if (kif->kf_structsize == 0) 220 break; 221 fd = shm_open(kif->kf_path, O_RDONLY, 0); 222 if (fd == -1) { 223 warn("open %s", kif->kf_path); 224 ret = 1; 225 continue; 226 } 227 error = fstat(fd, &st); 228 close(fd); 229 if (error != 0) { 230 warn("stat %s", kif->kf_path); 231 ret = 1; 232 continue; 233 } 234 shm_decode_mode(kif->kf_un.kf_file.kf_file_mode, str); 235 printf("%s\t", str); 236 if (uname) { 237 printf("%s\t%s\t", user_from_uid(st.st_uid, 0), 238 group_from_gid(st.st_gid, 0)); 239 } else { 240 printf("%d\t%d\t", st.st_uid, st.st_gid); 241 } 242 if (hsize) { 243 humanize_number(sizebuf, sizeof(sizebuf), 244 kif->kf_un.kf_file.kf_file_size, "", HN_AUTOSCALE, 245 HN_NOSPACE); 246 printf("%s\t", sizebuf); 247 } else { 248 printf("%jd\t", 249 (uintmax_t)kif->kf_un.kf_file.kf_file_size); 250 } 251 printf("%s\n", kif->kf_path); 252 } 253 out: 254 free(buf); 255 return (ret); 256 } 257 258 static int 259 read_one_shm(const char *path) 260 { 261 char buf[4096]; 262 ssize_t size, se; 263 int fd, ret; 264 265 ret = 1; 266 fd = shm_open(path, O_RDONLY, 0); 267 if (fd == -1) { 268 warn("open %s", path); 269 goto out; 270 } 271 for (;;) { 272 size = read(fd, buf, sizeof(buf)); 273 if (size > 0) { 274 se = fwrite(buf, 1, size, stdout); 275 if (se < size) { 276 warnx("short write to stdout"); 277 goto out; 278 } 279 } 280 if (size == (ssize_t)sizeof(buf)) 281 continue; 282 if (size >= 0 && size < (ssize_t)sizeof(buf)) { 283 ret = 0; 284 goto out; 285 } 286 warn("read from %s", path); 287 goto out; 288 } 289 out: 290 close(fd); 291 return (ret); 292 } 293 294 static int 295 read_shm(int argc, char **argv) 296 { 297 int i, ret, ret1; 298 299 ret = 0; 300 for (i = 1; i < argc; i++) { 301 ret1 = read_one_shm(argv[i]); 302 if (ret1 != 0 && ret == 0) 303 ret = ret1; 304 } 305 return (ret); 306 } 307 308 static int 309 stat_one_shm(const char *path, bool hsize, bool uname) 310 { 311 char sizebuf[8]; 312 struct stat st; 313 int error, fd, ret; 314 315 fd = shm_open(path, O_RDONLY, 0); 316 if (fd == -1) { 317 warn("open %s", path); 318 return (1); 319 } 320 ret = 0; 321 error = fstat(fd, &st); 322 if (error == -1) { 323 warn("stat %s", path); 324 ret = 1; 325 } else { 326 printf("path\t%s\n", path); 327 printf("inode\t%jd\n", (uintmax_t)st.st_ino); 328 printf("mode\t%#o\n", st.st_mode); 329 printf("nlink\t%jd\n", (uintmax_t)st.st_nlink); 330 if (uname) { 331 printf("owner\t%s\n", user_from_uid(st.st_uid, 0)); 332 printf("group\t%s\n", group_from_gid(st.st_gid, 0)); 333 } else { 334 printf("uid\t%d\n", st.st_uid); 335 printf("gid\t%d\n", st.st_gid); 336 } 337 if (hsize) { 338 humanize_number(sizebuf, sizeof(sizebuf), 339 st.st_size, "", HN_AUTOSCALE, HN_NOSPACE); 340 printf("size\t%s\n", sizebuf); 341 } else { 342 printf("size\t%jd\n", (uintmax_t)st.st_size); 343 } 344 printf("atime\t%ld.%09ld\n", (long)st.st_atime, 345 (long)st.st_atim.tv_nsec); 346 printf("mtime\t%ld.%09ld\n", (long)st.st_mtime, 347 (long)st.st_mtim.tv_nsec); 348 printf("ctime\t%ld.%09ld\n", (long)st.st_ctime, 349 (long)st.st_ctim.tv_nsec); 350 printf("birth\t%ld.%09ld\n", (long)st.st_birthtim.tv_sec, 351 (long)st.st_birthtim.tv_nsec); 352 } 353 close(fd); 354 return (ret); 355 } 356 357 static int 358 stat_shm(int argc, char **argv) 359 { 360 int c, i, ret, ret1; 361 bool hsize, uname; 362 363 hsize = false; 364 uname = true; 365 366 while ((c = getopt(argc, argv, "hn")) != -1) { 367 switch (c) { 368 case 'h': 369 hsize = true; 370 break; 371 case 'n': 372 uname = false; 373 break; 374 default: 375 usage(); 376 return (2); 377 } 378 } 379 argc -= optind; 380 argv += optind; 381 382 ret = 0; 383 for (i = 0; i < argc; i++) { 384 ret1 = stat_one_shm(argv[i], hsize, uname); 385 if (ret1 != 0 && ret == 0) 386 ret = ret1; 387 } 388 return (ret); 389 } 390 391 static int 392 truncate_one_shm(const char *path, uint64_t newsize) 393 { 394 int error, fd, ret; 395 396 ret = 0; 397 fd = shm_open(path, O_RDWR, 0); 398 if (fd == -1) { 399 warn("open %s", path); 400 return (1); 401 } 402 error = ftruncate(fd, newsize); 403 if (error == -1) { 404 warn("truncate %s", path); 405 ret = 1; 406 } 407 close(fd); 408 return (ret); 409 } 410 411 static int 412 truncate_shm(int argc, char **argv) 413 { 414 uint64_t newsize; 415 int c, i, ret, ret1; 416 417 newsize = 0; 418 while ((c = getopt(argc, argv, "s:")) != -1) { 419 switch (c) { 420 case 's': 421 if (expand_number(optarg, &newsize) == -1) 422 err(1, "size:"); 423 break; 424 case '?': 425 default: 426 return (2); 427 } 428 } 429 430 argc -= optind; 431 argv += optind; 432 ret = 0; 433 for (i = 0; i < argc; i++) { 434 ret1 = truncate_one_shm(argv[i], newsize); 435 if (ret1 != 0 && ret == 0) 436 ret = ret1; 437 } 438 return (ret); 439 } 440 441 struct opmode { 442 const char *cmd; 443 int (*impl)(int argc, char **argv); 444 }; 445 446 static const struct opmode opmodes[] = { 447 { .cmd = "create", .impl = create_shm}, 448 { .cmd = "rm", .impl = delete_shm, }, 449 { .cmd = "ls", .impl = list_shm }, 450 { .cmd = "dump", .impl = read_shm, }, 451 { .cmd = "stat", .impl = stat_shm, }, 452 { .cmd = "truncate", .impl = truncate_shm, }, 453 }; 454 455 int 456 main(int argc, char *argv[]) 457 { 458 const struct opmode *opmode; 459 int i, ret; 460 461 ret = 0; 462 opmode = NULL; 463 464 if (argc < 2) { 465 usage(); 466 exit(2); 467 } 468 for (i = 0; i < (int)nitems(opmodes); i++) { 469 if (strcmp(argv[1], opmodes[i].cmd) == 0) { 470 opmode = &opmodes[i]; 471 break; 472 } 473 } 474 if (opmode == NULL) { 475 usage(); 476 exit(2); 477 } 478 ret = opmode->impl(argc - 1, argv + 1); 479 exit(ret); 480 } 481