1 /* 2 * Copyright (c) 2001 Dima Dorfman. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 /* 28 * mdmfs (md/MFS) is a wrapper around mdconfig(8), 29 * newfs(8), and mount(8) that mimics the command line option set of 30 * the deprecated mount_mfs(8). 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/mdioctl.h> 38 #include <sys/stat.h> 39 #include <sys/wait.h> 40 41 #include <assert.h> 42 #include <err.h> 43 #include <fcntl.h> 44 #include <grp.h> 45 #include <paths.h> 46 #include <pwd.h> 47 #include <stdarg.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <ctype.h> 52 #include <unistd.h> 53 54 typedef enum { false, true } bool; 55 56 struct mtpt_info { 57 uid_t mi_uid; 58 bool mi_have_uid; 59 gid_t mi_gid; 60 bool mi_have_gid; 61 mode_t mi_mode; 62 bool mi_have_mode; 63 }; 64 65 static bool debug; /* Emit debugging information? */ 66 static bool loudsubs; /* Suppress output from helper programs? */ 67 static bool norun; /* Actually run the helper programs? */ 68 static int unit; /* The unit we're working with. */ 69 static const char *mdname; /* Name of memory disk device (e.g., "md"). */ 70 static const char *mdsuffix; /* Suffix of memory disk device (e.g., ".uzip"). */ 71 static size_t mdnamelen; /* Length of mdname. */ 72 static const char *path_mdconfig =_PATH_MDCONFIG; 73 74 static void argappend(char **, const char *, ...) __printflike(2, 3); 75 static void debugprintf(const char *, ...) __printflike(1, 2); 76 static void do_mdconfig_attach(const char *, const enum md_types); 77 static void do_mdconfig_attach_au(const char *, const enum md_types); 78 static void do_mdconfig_detach(void); 79 static void do_mount(const char *, const char *); 80 static void do_mtptsetup(const char *, struct mtpt_info *); 81 static void do_newfs(const char *); 82 static void extract_ugid(const char *, struct mtpt_info *); 83 static int run(int *, const char *, ...) __printflike(2, 3); 84 static void usage(void); 85 86 int 87 main(int argc, char **argv) 88 { 89 struct mtpt_info mi; /* Mountpoint info. */ 90 char *mdconfig_arg, *newfs_arg, /* Args to helper programs. */ 91 *mount_arg; 92 enum md_types mdtype; /* The type of our memory disk. */ 93 bool have_mdtype; 94 bool detach, softdep, autounit, newfs; 95 char *mtpoint, *unitstr; 96 char *p; 97 int ch; 98 void *set; 99 unsigned long ul; 100 101 /* Misc. initialization. */ 102 (void)memset(&mi, '\0', sizeof(mi)); 103 detach = true; 104 softdep = true; 105 autounit = false; 106 newfs = true; 107 have_mdtype = false; 108 mdtype = MD_SWAP; 109 mdname = MD_NAME; 110 mdnamelen = strlen(mdname); 111 /* 112 * Can't set these to NULL. They may be passed to the 113 * respective programs without modification. I.e., we may not 114 * receive any command-line options which will caused them to 115 * be modified. 116 */ 117 mdconfig_arg = strdup(""); 118 newfs_arg = strdup(""); 119 mount_arg = strdup(""); 120 121 /* If we were started as mount_mfs or mfs, imply -C. */ 122 if (strcmp(getprogname(), "mount_mfs") == 0 || 123 strcmp(getprogname(), "mfs") == 0) { 124 /* Make compatibility assumptions. */ 125 mi.mi_mode = 01777; 126 mi.mi_have_mode = true; 127 } 128 129 while ((ch = getopt(argc, argv, 130 "a:b:Cc:Dd:E:e:F:f:hi:LlMm:Nn:O:o:Pp:Ss:t:Uv:w:X")) != -1) 131 switch (ch) { 132 case 'a': 133 argappend(&newfs_arg, "-a %s", optarg); 134 break; 135 case 'b': 136 argappend(&newfs_arg, "-b %s", optarg); 137 break; 138 case 'C': 139 /* Ignored for compatibility. */ 140 break; 141 case 'c': 142 argappend(&newfs_arg, "-c %s", optarg); 143 break; 144 case 'D': 145 detach = false; 146 break; 147 case 'd': 148 argappend(&newfs_arg, "-d %s", optarg); 149 break; 150 case 'E': 151 path_mdconfig = optarg; 152 break; 153 case 'e': 154 argappend(&newfs_arg, "-e %s", optarg); 155 break; 156 case 'F': 157 if (have_mdtype) 158 usage(); 159 mdtype = MD_VNODE; 160 have_mdtype = true; 161 argappend(&mdconfig_arg, "-f %s", optarg); 162 break; 163 case 'f': 164 argappend(&newfs_arg, "-f %s", optarg); 165 break; 166 case 'h': 167 usage(); 168 break; 169 case 'i': 170 argappend(&newfs_arg, "-i %s", optarg); 171 break; 172 case 'L': 173 loudsubs = true; 174 break; 175 case 'l': 176 argappend(&newfs_arg, "-l"); 177 break; 178 case 'M': 179 if (have_mdtype) 180 usage(); 181 mdtype = MD_MALLOC; 182 have_mdtype = true; 183 break; 184 case 'm': 185 argappend(&newfs_arg, "-m %s", optarg); 186 break; 187 case 'N': 188 norun = true; 189 break; 190 case 'n': 191 argappend(&newfs_arg, "-n %s", optarg); 192 break; 193 case 'O': 194 argappend(&newfs_arg, "-o %s", optarg); 195 break; 196 case 'o': 197 argappend(&mount_arg, "-o %s", optarg); 198 break; 199 case 'P': 200 newfs = false; 201 break; 202 case 'p': 203 if ((set = setmode(optarg)) == NULL) 204 usage(); 205 mi.mi_mode = getmode(set, S_IRWXU | S_IRWXG | S_IRWXO); 206 mi.mi_have_mode = true; 207 free(set); 208 break; 209 case 'S': 210 softdep = false; 211 break; 212 case 's': 213 argappend(&mdconfig_arg, "-s %s", optarg); 214 break; 215 case 'U': 216 softdep = true; 217 break; 218 case 'v': 219 argappend(&newfs_arg, "-O %s", optarg); 220 break; 221 case 'w': 222 extract_ugid(optarg, &mi); 223 break; 224 case 'X': 225 debug = true; 226 break; 227 default: 228 usage(); 229 } 230 argc -= optind; 231 argv += optind; 232 if (argc < 2) 233 usage(); 234 235 /* Derive 'unit' (global). */ 236 unitstr = argv[0]; 237 if (strncmp(unitstr, "/dev/", 5) == 0) 238 unitstr += 5; 239 if (strncmp(unitstr, mdname, mdnamelen) == 0) 240 unitstr += mdnamelen; 241 if (!isdigit(*unitstr)) { 242 autounit = true; 243 unit = -1; 244 mdsuffix = unitstr; 245 } else { 246 ul = strtoul(unitstr, &p, 10); 247 if (ul == ULONG_MAX) 248 errx(1, "bad device unit: %s", unitstr); 249 if (*p != '\0') 250 mdsuffix = p; 251 unit = ul; 252 } 253 254 mtpoint = argv[1]; 255 if (!have_mdtype) 256 mdtype = MD_SWAP; 257 if (softdep) 258 argappend(&newfs_arg, "-U"); 259 if (mdtype != MD_VNODE && !newfs) 260 errx(1, "-P requires a vnode-backed disk"); 261 262 /* Do the work. */ 263 if (detach && !autounit) 264 do_mdconfig_detach(); 265 if (autounit) 266 do_mdconfig_attach_au(mdconfig_arg, mdtype); 267 else 268 do_mdconfig_attach(mdconfig_arg, mdtype); 269 if (newfs) 270 do_newfs(newfs_arg); 271 do_mount(mount_arg, mtpoint); 272 do_mtptsetup(mtpoint, &mi); 273 274 return (0); 275 } 276 277 /* 278 * Append the expansion of 'fmt' to the buffer pointed to by '*dstp'; 279 * reallocate as required. 280 */ 281 static void 282 argappend(char **dstp, const char *fmt, ...) 283 { 284 char *old, *new; 285 va_list ap; 286 287 old = *dstp; 288 assert(old != NULL); 289 290 va_start(ap, fmt); 291 if (vasprintf(&new, fmt,ap) == -1) 292 errx(1, "vasprintf"); 293 va_end(ap); 294 295 *dstp = new; 296 if (asprintf(&new, "%s %s", old, new) == -1) 297 errx(1, "asprintf"); 298 free(*dstp); 299 free(old); 300 301 *dstp = new; 302 } 303 304 /* 305 * If run-time debugging is enabled, print the expansion of 'fmt'. 306 * Otherwise, do nothing. 307 */ 308 static void 309 debugprintf(const char *fmt, ...) 310 { 311 va_list ap; 312 313 if (!debug) 314 return; 315 fprintf(stderr, "DEBUG: "); 316 va_start(ap, fmt); 317 vfprintf(stderr, fmt, ap); 318 va_end(ap); 319 fprintf(stderr, "\n"); 320 fflush(stderr); 321 } 322 323 /* 324 * Attach a memory disk with a known unit. 325 */ 326 static void 327 do_mdconfig_attach(const char *args, const enum md_types mdtype) 328 { 329 int rv; 330 const char *ta; /* Type arg. */ 331 332 switch (mdtype) { 333 case MD_SWAP: 334 ta = "-t swap"; 335 break; 336 case MD_VNODE: 337 ta = "-t vnode"; 338 break; 339 case MD_MALLOC: 340 ta = "-t malloc"; 341 break; 342 default: 343 abort(); 344 } 345 rv = run(NULL, "%s -a %s%s -u %s%d", path_mdconfig, ta, args, 346 mdname, unit); 347 if (rv) 348 errx(1, "mdconfig (attach) exited with error code %d", rv); 349 } 350 351 /* 352 * Attach a memory disk with an unknown unit; use autounit. 353 */ 354 static void 355 do_mdconfig_attach_au(const char *args, const enum md_types mdtype) 356 { 357 const char *ta; /* Type arg. */ 358 char *linep, *linebuf; /* Line pointer, line buffer. */ 359 int fd; /* Standard output of mdconfig invocation. */ 360 FILE *sfd; 361 int rv; 362 char *p; 363 size_t linelen; 364 unsigned long ul; 365 366 switch (mdtype) { 367 case MD_SWAP: 368 ta = "-t swap"; 369 break; 370 case MD_VNODE: 371 ta = "-t vnode"; 372 break; 373 case MD_MALLOC: 374 ta = "-t malloc"; 375 break; 376 default: 377 abort(); 378 } 379 rv = run(&fd, "%s -a %s%s", path_mdconfig, ta, args); 380 if (rv) 381 errx(1, "mdconfig (attach) exited with error code %d", rv); 382 383 /* Receive the unit number. */ 384 if (norun) { /* Since we didn't run, we can't read. Fake it. */ 385 unit = 0; 386 return; 387 } 388 sfd = fdopen(fd, "r"); 389 if (sfd == NULL) 390 err(1, "fdopen"); 391 linep = fgetln(sfd, &linelen); 392 if (linep == NULL && linelen < mdnamelen + 1) 393 errx(1, "unexpected output from mdconfig (attach)"); 394 /* If the output format changes, we want to know about it. */ 395 assert(strncmp(linep, mdname, mdnamelen) == 0); 396 linebuf = malloc(linelen - mdnamelen + 1); 397 assert(linebuf != NULL); 398 /* Can't use strlcpy because linep is not NULL-terminated. */ 399 strncpy(linebuf, linep + mdnamelen, linelen); 400 linebuf[linelen] = '\0'; 401 ul = strtoul(linebuf, &p, 10); 402 if (ul == ULONG_MAX || *p != '\n') 403 errx(1, "unexpected output from mdconfig (attach)"); 404 unit = ul; 405 406 fclose(sfd); 407 close(fd); 408 } 409 410 /* 411 * Detach a memory disk. 412 */ 413 static void 414 do_mdconfig_detach(void) 415 { 416 int rv; 417 418 rv = run(NULL, "%s -d -u %s%d", path_mdconfig, mdname, unit); 419 if (rv && debug) /* This is allowed to fail. */ 420 warnx("mdconfig (detach) exited with error code %d (ignored)", 421 rv); 422 } 423 424 /* 425 * Mount the configured memory disk. 426 */ 427 static void 428 do_mount(const char *args, const char *mtpoint) 429 { 430 int rv; 431 432 rv = run(NULL, "%s%s /dev/%s%d%s %s", _PATH_MOUNT, args, 433 mdname, unit, mdsuffix, mtpoint); 434 if (rv) 435 errx(1, "mount exited with error code %d", rv); 436 } 437 438 /* 439 * Various configuration of the mountpoint. Mostly, enact 'mip'. 440 */ 441 static void 442 do_mtptsetup(const char *mtpoint, struct mtpt_info *mip) 443 { 444 445 if (mip->mi_have_mode) { 446 debugprintf("changing mode of %s to %o.", mtpoint, 447 mip->mi_mode); 448 if (!norun) 449 if (chmod(mtpoint, mip->mi_mode) == -1) 450 err(1, "chmod: %s", mtpoint); 451 } 452 /* 453 * We have to do these separately because the user may have 454 * only specified one of them. 455 */ 456 if (mip->mi_have_uid) { 457 debugprintf("changing owner (user) or %s to %u.", mtpoint, 458 mip->mi_uid); 459 if (!norun) 460 if (chown(mtpoint, mip->mi_uid, -1) == -1) 461 err(1, "chown %s to %u (user)", mtpoint, 462 mip->mi_uid); 463 } 464 if (mip->mi_have_gid) { 465 debugprintf("changing owner (group) or %s to %u.", mtpoint, 466 mip->mi_gid); 467 if (!norun) 468 if (chown(mtpoint, -1, mip->mi_gid) == -1) 469 err(1, "chown %s to %u (group)", mtpoint, 470 mip->mi_gid); 471 } 472 } 473 474 /* 475 * Put a file system on the memory disk. 476 */ 477 static void 478 do_newfs(const char *args) 479 { 480 int rv; 481 482 rv = run(NULL, "%s%s /dev/%s%d", _PATH_NEWFS, args, mdname, unit); 483 if (rv) 484 errx(1, "newfs exited with error code %d", rv); 485 } 486 487 /* 488 * 'str' should be a user and group name similar to the last argument 489 * to chown(1); i.e., a user, followed by a colon, followed by a 490 * group. The user and group in 'str' may be either a [ug]id or a 491 * name. Upon return, the uid and gid fields in 'mip' will contain 492 * the uid and gid of the user and group name in 'str', respectively. 493 * 494 * In other words, this derives a user and group id from a string 495 * formatted like the last argument to chown(1). 496 * 497 * Notice: At this point we don't support only a username or only a 498 * group name. do_mtptsetup already does, so when this feature is 499 * desired, this is the only routine that needs to be changed. 500 */ 501 static void 502 extract_ugid(const char *str, struct mtpt_info *mip) 503 { 504 char *ug; /* Writable 'str'. */ 505 char *user, *group; /* Result of extracton. */ 506 struct passwd *pw; 507 struct group *gr; 508 char *p; 509 uid_t *uid; 510 gid_t *gid; 511 512 uid = &mip->mi_uid; 513 gid = &mip->mi_gid; 514 mip->mi_have_uid = mip->mi_have_gid = false; 515 516 /* Extract the user and group from 'str'. Format above. */ 517 ug = strdup(str); 518 assert(ug != NULL); 519 group = ug; 520 user = strsep(&group, ":"); 521 if (user == NULL || group == NULL || *user == '\0' || *group == '\0') 522 usage(); 523 524 /* Derive uid. */ 525 *uid = strtoul(user, &p, 10); 526 if (*uid == (uid_t)ULONG_MAX) 527 usage(); 528 if (*p != '\0') { 529 pw = getpwnam(user); 530 if (pw == NULL) 531 errx(1, "invalid user: %s", user); 532 *uid = pw->pw_uid; 533 } 534 mip->mi_have_uid = true; 535 536 /* Derive gid. */ 537 *gid = strtoul(group, &p, 10); 538 if (*gid == (gid_t)ULONG_MAX) 539 usage(); 540 if (*p != '\0') { 541 gr = getgrnam(group); 542 if (gr == NULL) 543 errx(1, "invalid group: %s", group); 544 *gid = gr->gr_gid; 545 } 546 mip->mi_have_gid = true; 547 548 free(ug); 549 } 550 551 /* 552 * Run a process with command name and arguments pointed to by the 553 * formatted string 'cmdline'. Since system(3) is not used, the first 554 * space-delimited token of 'cmdline' must be the full pathname of the 555 * program to run. The return value is the return code of the process 556 * spawned. If 'ofd' is non-NULL, it is set to the standard output of 557 * the program spawned (i.e., you can read from ofd and get the output 558 * of the program). 559 */ 560 static int 561 run(int *ofd, const char *cmdline, ...) 562 { 563 char **argv, **argvp; /* Result of splitting 'cmd'. */ 564 int argc; 565 char *cmd; /* Expansion of 'cmdline'. */ 566 int pid, status; /* Child info. */ 567 int pfd[2]; /* Pipe to the child. */ 568 int nfd; /* Null (/dev/null) file descriptor. */ 569 bool dup2dn; /* Dup /dev/null to stdout? */ 570 va_list ap; 571 char *p; 572 int rv, i; 573 574 dup2dn = true; 575 va_start(ap, cmdline); 576 rv = vasprintf(&cmd, cmdline, ap); 577 if (rv == -1) 578 err(1, "vasprintf"); 579 va_end(ap); 580 581 /* Split up 'cmd' into 'argv' for use with execve. */ 582 for (argc = 1, p = cmd; (p = strchr(p, ' ')) != NULL; p++) 583 argc++; /* 'argc' generation loop. */ 584 argv = (char **)malloc(sizeof(*argv) * (argc + 1)); 585 assert(argv != NULL); 586 for (p = cmd, argvp = argv; (*argvp = strsep(&p, " ")) != NULL;) 587 if (**argv != '\0') 588 if (++argvp >= &argv[argc]) { 589 *argvp = NULL; 590 break; 591 } 592 assert(*argv); 593 594 /* Make sure the above loop works as expected. */ 595 if (debug) { 596 /* 597 * We can't, but should, use debugprintf here. First, 598 * it appends a trailing newline to the output, and 599 * second it prepends "DEBUG: " to the output. The 600 * former is a problem for this would-be first call, 601 * and the latter for the would-be call inside the 602 * loop. 603 */ 604 (void)fprintf(stderr, "DEBUG: running:"); 605 /* Should be equivilent to 'cmd' (before strsep, of course). */ 606 for (i = 0; argv[i] != NULL; i++) 607 (void)fprintf(stderr, " %s", argv[i]); 608 (void)fprintf(stderr, "\n"); 609 } 610 611 /* Create a pipe if necessary and fork the helper program. */ 612 if (ofd != NULL) { 613 if (pipe(&pfd[0]) == -1) 614 err(1, "pipe"); 615 *ofd = pfd[0]; 616 dup2dn = false; 617 } 618 pid = fork(); 619 switch (pid) { 620 case 0: 621 /* XXX can we call err() in here? */ 622 if (norun) 623 _exit(0); 624 if (ofd != NULL) 625 if (dup2(pfd[1], STDOUT_FILENO) < 0) 626 err(1, "dup2"); 627 if (!loudsubs) { 628 nfd = open(_PATH_DEVNULL, O_RDWR); 629 if (nfd == -1) 630 err(1, "open: %s", _PATH_DEVNULL); 631 if (dup2(nfd, STDIN_FILENO) < 0) 632 err(1, "dup2"); 633 if (dup2dn) 634 if (dup2(nfd, STDOUT_FILENO) < 0) 635 err(1, "dup2"); 636 if (dup2(nfd, STDERR_FILENO) < 0) 637 err(1, "dup2"); 638 } 639 640 (void)execv(argv[0], argv); 641 warn("exec: %s", argv[0]); 642 _exit(-1); 643 case -1: 644 err(1, "fork"); 645 } 646 647 free(cmd); 648 free(argv); 649 while (waitpid(pid, &status, 0) != pid) 650 ; 651 return (WEXITSTATUS(status)); 652 } 653 654 static void 655 usage(void) 656 { 657 658 fprintf(stderr, 659 "usage: %s [-DLlMNPSUX] [-a maxcontig] [-b block-size]\n" 660 "\t[-c blocks-per-cylinder-group][-d max-extent-size] [-E path-mdconfig]\n" 661 "\t[-e maxbpg] [-F file] [-f frag-size] [-i bytes] [-m percent-free]\n" 662 "\t[-n rotational-positions] [-O optimization] [-o mount-options]\n" 663 "\t[-p permissions] [-s size] [-v version] [-w user:group]\n" 664 "\tmd-device mount-point\n", getprogname()); 665 exit(1); 666 } 667