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/mount.h> 39 #include <sys/stat.h> 40 #include <sys/wait.h> 41 42 #include <assert.h> 43 #include <err.h> 44 #include <fcntl.h> 45 #include <grp.h> 46 #include <paths.h> 47 #include <pwd.h> 48 #include <stdarg.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <ctype.h> 53 #include <unistd.h> 54 55 typedef enum { false, true } bool; 56 57 struct mtpt_info { 58 uid_t mi_uid; 59 bool mi_have_uid; 60 gid_t mi_gid; 61 bool mi_have_gid; 62 mode_t mi_mode; 63 bool mi_have_mode; 64 bool mi_forced_pw; 65 }; 66 67 static bool debug; /* Emit debugging information? */ 68 static bool loudsubs; /* Suppress output from helper programs? */ 69 static bool norun; /* Actually run the helper programs? */ 70 static int unit; /* The unit we're working with. */ 71 static const char *mdname; /* Name of memory disk device (e.g., "md"). */ 72 static const char *mdsuffix; /* Suffix of memory disk device (e.g., ".uzip"). */ 73 static size_t mdnamelen; /* Length of mdname. */ 74 static const char *path_mdconfig =_PATH_MDCONFIG; 75 76 static void argappend(char **, const char *, ...) __printflike(2, 3); 77 static void debugprintf(const char *, ...) __printflike(1, 2); 78 static void do_mdconfig_attach(const char *, const enum md_types); 79 static void do_mdconfig_attach_au(const char *, const enum md_types); 80 static void do_mdconfig_detach(void); 81 static void do_mount(const char *, const char *); 82 static void do_mtptsetup(const char *, struct mtpt_info *); 83 static void do_newfs(const char *); 84 static void extract_ugid(const char *, struct mtpt_info *); 85 static int run(int *, const char *, ...) __printflike(2, 3); 86 static void usage(void); 87 88 int 89 main(int argc, char **argv) 90 { 91 struct mtpt_info mi; /* Mountpoint info. */ 92 char *mdconfig_arg, *newfs_arg, /* Args to helper programs. */ 93 *mount_arg; 94 enum md_types mdtype; /* The type of our memory disk. */ 95 bool have_mdtype; 96 bool detach, softdep, autounit, newfs; 97 char *mtpoint, *unitstr; 98 char *p; 99 int ch; 100 void *set; 101 unsigned long ul; 102 103 /* Misc. initialization. */ 104 (void)memset(&mi, '\0', sizeof(mi)); 105 detach = true; 106 softdep = true; 107 autounit = false; 108 newfs = true; 109 have_mdtype = false; 110 mdtype = MD_SWAP; 111 mdname = MD_NAME; 112 mdnamelen = strlen(mdname); 113 /* 114 * Can't set these to NULL. They may be passed to the 115 * respective programs without modification. I.e., we may not 116 * receive any command-line options which will caused them to 117 * be modified. 118 */ 119 mdconfig_arg = strdup(""); 120 newfs_arg = strdup(""); 121 mount_arg = strdup(""); 122 123 /* If we were started as mount_mfs or mfs, imply -C. */ 124 if (strcmp(getprogname(), "mount_mfs") == 0 || 125 strcmp(getprogname(), "mfs") == 0) { 126 /* Make compatibility assumptions. */ 127 mi.mi_mode = 01777; 128 mi.mi_have_mode = true; 129 } 130 131 while ((ch = getopt(argc, argv, 132 "a:b:Cc:Dd:E:e:F:f:hi:LlMm:NnO:o:Pp:Ss:tUv:w:X")) != -1) 133 switch (ch) { 134 case 'a': 135 argappend(&newfs_arg, "-a %s", optarg); 136 break; 137 case 'b': 138 argappend(&newfs_arg, "-b %s", optarg); 139 break; 140 case 'C': 141 /* Ignored for compatibility. */ 142 break; 143 case 'c': 144 argappend(&newfs_arg, "-c %s", optarg); 145 break; 146 case 'D': 147 detach = false; 148 break; 149 case 'd': 150 argappend(&newfs_arg, "-d %s", optarg); 151 break; 152 case 'E': 153 path_mdconfig = optarg; 154 break; 155 case 'e': 156 argappend(&newfs_arg, "-e %s", optarg); 157 break; 158 case 'F': 159 if (have_mdtype) 160 usage(); 161 mdtype = MD_VNODE; 162 have_mdtype = true; 163 argappend(&mdconfig_arg, "-f %s", optarg); 164 break; 165 case 'f': 166 argappend(&newfs_arg, "-f %s", optarg); 167 break; 168 case 'h': 169 usage(); 170 break; 171 case 'i': 172 argappend(&newfs_arg, "-i %s", optarg); 173 break; 174 case 'L': 175 loudsubs = true; 176 break; 177 case 'l': 178 argappend(&newfs_arg, "-l"); 179 break; 180 case 'M': 181 if (have_mdtype) 182 usage(); 183 mdtype = MD_MALLOC; 184 have_mdtype = true; 185 break; 186 case 'm': 187 argappend(&newfs_arg, "-m %s", optarg); 188 break; 189 case 'N': 190 norun = true; 191 break; 192 case 'n': 193 argappend(&newfs_arg, "-n"); 194 break; 195 case 'O': 196 argappend(&newfs_arg, "-o %s", optarg); 197 break; 198 case 'o': 199 argappend(&mount_arg, "-o %s", optarg); 200 break; 201 case 'P': 202 newfs = false; 203 break; 204 case 'p': 205 if ((set = setmode(optarg)) == NULL) 206 usage(); 207 mi.mi_mode = getmode(set, S_IRWXU | S_IRWXG | S_IRWXO); 208 mi.mi_have_mode = true; 209 mi.mi_forced_pw = true; 210 free(set); 211 break; 212 case 'S': 213 softdep = false; 214 break; 215 case 's': 216 argappend(&mdconfig_arg, "-s %s", optarg); 217 break; 218 case 't': 219 argappend(&newfs_arg, "-t"); 220 break; 221 case 'U': 222 softdep = true; 223 break; 224 case 'v': 225 argappend(&newfs_arg, "-O %s", optarg); 226 break; 227 case 'w': 228 extract_ugid(optarg, &mi); 229 mi.mi_forced_pw = true; 230 break; 231 case 'X': 232 debug = true; 233 break; 234 default: 235 usage(); 236 } 237 argc -= optind; 238 argv += optind; 239 if (argc < 2) 240 usage(); 241 242 /* Derive 'unit' (global). */ 243 unitstr = argv[0]; 244 if (strncmp(unitstr, "/dev/", 5) == 0) 245 unitstr += 5; 246 if (strncmp(unitstr, mdname, mdnamelen) == 0) 247 unitstr += mdnamelen; 248 if (!isdigit(*unitstr)) { 249 autounit = true; 250 unit = -1; 251 mdsuffix = unitstr; 252 } else { 253 ul = strtoul(unitstr, &p, 10); 254 if (ul == ULONG_MAX) 255 errx(1, "bad device unit: %s", unitstr); 256 unit = ul; 257 mdsuffix = p; /* can be empty */ 258 } 259 260 mtpoint = argv[1]; 261 if (!have_mdtype) 262 mdtype = MD_SWAP; 263 if (softdep) 264 argappend(&newfs_arg, "-U"); 265 if (mdtype != MD_VNODE && !newfs) 266 errx(1, "-P requires a vnode-backed disk"); 267 268 /* Do the work. */ 269 if (detach && !autounit) 270 do_mdconfig_detach(); 271 if (autounit) 272 do_mdconfig_attach_au(mdconfig_arg, mdtype); 273 else 274 do_mdconfig_attach(mdconfig_arg, mdtype); 275 if (newfs) 276 do_newfs(newfs_arg); 277 do_mount(mount_arg, mtpoint); 278 do_mtptsetup(mtpoint, &mi); 279 280 return (0); 281 } 282 283 /* 284 * Append the expansion of 'fmt' to the buffer pointed to by '*dstp'; 285 * reallocate as required. 286 */ 287 static void 288 argappend(char **dstp, const char *fmt, ...) 289 { 290 char *old, *new; 291 va_list ap; 292 293 old = *dstp; 294 assert(old != NULL); 295 296 va_start(ap, fmt); 297 if (vasprintf(&new, fmt,ap) == -1) 298 errx(1, "vasprintf"); 299 va_end(ap); 300 301 *dstp = new; 302 if (asprintf(&new, "%s %s", old, new) == -1) 303 errx(1, "asprintf"); 304 free(*dstp); 305 free(old); 306 307 *dstp = new; 308 } 309 310 /* 311 * If run-time debugging is enabled, print the expansion of 'fmt'. 312 * Otherwise, do nothing. 313 */ 314 static void 315 debugprintf(const char *fmt, ...) 316 { 317 va_list ap; 318 319 if (!debug) 320 return; 321 fprintf(stderr, "DEBUG: "); 322 va_start(ap, fmt); 323 vfprintf(stderr, fmt, ap); 324 va_end(ap); 325 fprintf(stderr, "\n"); 326 fflush(stderr); 327 } 328 329 /* 330 * Attach a memory disk with a known unit. 331 */ 332 static void 333 do_mdconfig_attach(const char *args, const enum md_types mdtype) 334 { 335 int rv; 336 const char *ta; /* Type arg. */ 337 338 switch (mdtype) { 339 case MD_SWAP: 340 ta = "-t swap"; 341 break; 342 case MD_VNODE: 343 ta = "-t vnode"; 344 break; 345 case MD_MALLOC: 346 ta = "-t malloc"; 347 break; 348 default: 349 abort(); 350 } 351 rv = run(NULL, "%s -a %s%s -u %s%d", path_mdconfig, ta, args, 352 mdname, unit); 353 if (rv) 354 errx(1, "mdconfig (attach) exited with error code %d", rv); 355 } 356 357 /* 358 * Attach a memory disk with an unknown unit; use autounit. 359 */ 360 static void 361 do_mdconfig_attach_au(const char *args, const enum md_types mdtype) 362 { 363 const char *ta; /* Type arg. */ 364 char *linep, *linebuf; /* Line pointer, line buffer. */ 365 int fd; /* Standard output of mdconfig invocation. */ 366 FILE *sfd; 367 int rv; 368 char *p; 369 size_t linelen; 370 unsigned long ul; 371 372 switch (mdtype) { 373 case MD_SWAP: 374 ta = "-t swap"; 375 break; 376 case MD_VNODE: 377 ta = "-t vnode"; 378 break; 379 case MD_MALLOC: 380 ta = "-t malloc"; 381 break; 382 default: 383 abort(); 384 } 385 rv = run(&fd, "%s -a %s%s", path_mdconfig, ta, args); 386 if (rv) 387 errx(1, "mdconfig (attach) exited with error code %d", rv); 388 389 /* Receive the unit number. */ 390 if (norun) { /* Since we didn't run, we can't read. Fake it. */ 391 unit = 0; 392 return; 393 } 394 sfd = fdopen(fd, "r"); 395 if (sfd == NULL) 396 err(1, "fdopen"); 397 linep = fgetln(sfd, &linelen); 398 if (linep == NULL && linelen < mdnamelen + 1) 399 errx(1, "unexpected output from mdconfig (attach)"); 400 /* If the output format changes, we want to know about it. */ 401 assert(strncmp(linep, mdname, mdnamelen) == 0); 402 linebuf = malloc(linelen - mdnamelen + 1); 403 assert(linebuf != NULL); 404 /* Can't use strlcpy because linep is not NULL-terminated. */ 405 strncpy(linebuf, linep + mdnamelen, linelen); 406 linebuf[linelen] = '\0'; 407 ul = strtoul(linebuf, &p, 10); 408 if (ul == ULONG_MAX || *p != '\n') 409 errx(1, "unexpected output from mdconfig (attach)"); 410 unit = ul; 411 412 fclose(sfd); 413 close(fd); 414 } 415 416 /* 417 * Detach a memory disk. 418 */ 419 static void 420 do_mdconfig_detach(void) 421 { 422 int rv; 423 424 rv = run(NULL, "%s -d -u %s%d", path_mdconfig, mdname, unit); 425 if (rv && debug) /* This is allowed to fail. */ 426 warnx("mdconfig (detach) exited with error code %d (ignored)", 427 rv); 428 } 429 430 /* 431 * Mount the configured memory disk. 432 */ 433 static void 434 do_mount(const char *args, const char *mtpoint) 435 { 436 int rv; 437 438 rv = run(NULL, "%s%s /dev/%s%d%s %s", _PATH_MOUNT, args, 439 mdname, unit, mdsuffix, mtpoint); 440 if (rv) 441 errx(1, "mount exited with error code %d", rv); 442 } 443 444 /* 445 * Various configuration of the mountpoint. Mostly, enact 'mip'. 446 */ 447 static void 448 do_mtptsetup(const char *mtpoint, struct mtpt_info *mip) 449 { 450 struct statfs sfs; 451 452 if (!mip->mi_have_mode && !mip->mi_have_uid && !mip->mi_have_gid) 453 return; 454 455 if (!norun) { 456 if (statfs(mtpoint, &sfs) == -1) { 457 warn("statfs: %s", mtpoint); 458 return; 459 } 460 if ((sfs.f_flags & MNT_RDONLY) != 0) { 461 if (mip->mi_forced_pw) { 462 warnx( 463 "Not changing mode/owner of %s since it is read-only", 464 mtpoint); 465 } else { 466 debugprintf( 467 "Not changing mode/owner of %s since it is read-only", 468 mtpoint); 469 } 470 return; 471 } 472 } 473 474 if (mip->mi_have_mode) { 475 debugprintf("changing mode of %s to %o.", mtpoint, 476 mip->mi_mode); 477 if (!norun) 478 if (chmod(mtpoint, mip->mi_mode) == -1) 479 err(1, "chmod: %s", mtpoint); 480 } 481 /* 482 * We have to do these separately because the user may have 483 * only specified one of them. 484 */ 485 if (mip->mi_have_uid) { 486 debugprintf("changing owner (user) or %s to %u.", mtpoint, 487 mip->mi_uid); 488 if (!norun) 489 if (chown(mtpoint, mip->mi_uid, -1) == -1) 490 err(1, "chown %s to %u (user)", mtpoint, 491 mip->mi_uid); 492 } 493 if (mip->mi_have_gid) { 494 debugprintf("changing owner (group) or %s to %u.", mtpoint, 495 mip->mi_gid); 496 if (!norun) 497 if (chown(mtpoint, -1, mip->mi_gid) == -1) 498 err(1, "chown %s to %u (group)", mtpoint, 499 mip->mi_gid); 500 } 501 } 502 503 /* 504 * Put a file system on the memory disk. 505 */ 506 static void 507 do_newfs(const char *args) 508 { 509 int rv; 510 511 rv = run(NULL, "%s%s /dev/%s%d", _PATH_NEWFS, args, mdname, unit); 512 if (rv) 513 errx(1, "newfs exited with error code %d", rv); 514 } 515 516 /* 517 * 'str' should be a user and group name similar to the last argument 518 * to chown(1); i.e., a user, followed by a colon, followed by a 519 * group. The user and group in 'str' may be either a [ug]id or a 520 * name. Upon return, the uid and gid fields in 'mip' will contain 521 * the uid and gid of the user and group name in 'str', respectively. 522 * 523 * In other words, this derives a user and group id from a string 524 * formatted like the last argument to chown(1). 525 * 526 * Notice: At this point we don't support only a username or only a 527 * group name. do_mtptsetup already does, so when this feature is 528 * desired, this is the only routine that needs to be changed. 529 */ 530 static void 531 extract_ugid(const char *str, struct mtpt_info *mip) 532 { 533 char *ug; /* Writable 'str'. */ 534 char *user, *group; /* Result of extracton. */ 535 struct passwd *pw; 536 struct group *gr; 537 char *p; 538 uid_t *uid; 539 gid_t *gid; 540 541 uid = &mip->mi_uid; 542 gid = &mip->mi_gid; 543 mip->mi_have_uid = mip->mi_have_gid = false; 544 545 /* Extract the user and group from 'str'. Format above. */ 546 ug = strdup(str); 547 assert(ug != NULL); 548 group = ug; 549 user = strsep(&group, ":"); 550 if (user == NULL || group == NULL || *user == '\0' || *group == '\0') 551 usage(); 552 553 /* Derive uid. */ 554 *uid = strtoul(user, &p, 10); 555 if (*uid == (uid_t)ULONG_MAX) 556 usage(); 557 if (*p != '\0') { 558 pw = getpwnam(user); 559 if (pw == NULL) 560 errx(1, "invalid user: %s", user); 561 *uid = pw->pw_uid; 562 } 563 mip->mi_have_uid = true; 564 565 /* Derive gid. */ 566 *gid = strtoul(group, &p, 10); 567 if (*gid == (gid_t)ULONG_MAX) 568 usage(); 569 if (*p != '\0') { 570 gr = getgrnam(group); 571 if (gr == NULL) 572 errx(1, "invalid group: %s", group); 573 *gid = gr->gr_gid; 574 } 575 mip->mi_have_gid = true; 576 577 free(ug); 578 } 579 580 /* 581 * Run a process with command name and arguments pointed to by the 582 * formatted string 'cmdline'. Since system(3) is not used, the first 583 * space-delimited token of 'cmdline' must be the full pathname of the 584 * program to run. The return value is the return code of the process 585 * spawned. If 'ofd' is non-NULL, it is set to the standard output of 586 * the program spawned (i.e., you can read from ofd and get the output 587 * of the program). 588 */ 589 static int 590 run(int *ofd, const char *cmdline, ...) 591 { 592 char **argv, **argvp; /* Result of splitting 'cmd'. */ 593 int argc; 594 char *cmd; /* Expansion of 'cmdline'. */ 595 int pid, status; /* Child info. */ 596 int pfd[2]; /* Pipe to the child. */ 597 int nfd; /* Null (/dev/null) file descriptor. */ 598 bool dup2dn; /* Dup /dev/null to stdout? */ 599 va_list ap; 600 char *p; 601 int rv, i; 602 603 dup2dn = true; 604 va_start(ap, cmdline); 605 rv = vasprintf(&cmd, cmdline, ap); 606 if (rv == -1) 607 err(1, "vasprintf"); 608 va_end(ap); 609 610 /* Split up 'cmd' into 'argv' for use with execve. */ 611 for (argc = 1, p = cmd; (p = strchr(p, ' ')) != NULL; p++) 612 argc++; /* 'argc' generation loop. */ 613 argv = (char **)malloc(sizeof(*argv) * (argc + 1)); 614 assert(argv != NULL); 615 for (p = cmd, argvp = argv; (*argvp = strsep(&p, " ")) != NULL;) 616 if (**argvp != '\0') 617 if (++argvp >= &argv[argc]) { 618 *argvp = NULL; 619 break; 620 } 621 assert(*argv); 622 /* The argv array ends up NULL-terminated here. */ 623 624 /* Make sure the above loop works as expected. */ 625 if (debug) { 626 /* 627 * We can't, but should, use debugprintf here. First, 628 * it appends a trailing newline to the output, and 629 * second it prepends "DEBUG: " to the output. The 630 * former is a problem for this would-be first call, 631 * and the latter for the would-be call inside the 632 * loop. 633 */ 634 (void)fprintf(stderr, "DEBUG: running:"); 635 /* Should be equivilent to 'cmd' (before strsep, of course). */ 636 for (i = 0; argv[i] != NULL; i++) 637 (void)fprintf(stderr, " %s", argv[i]); 638 (void)fprintf(stderr, "\n"); 639 } 640 641 /* Create a pipe if necessary and fork the helper program. */ 642 if (ofd != NULL) { 643 if (pipe(&pfd[0]) == -1) 644 err(1, "pipe"); 645 *ofd = pfd[0]; 646 dup2dn = false; 647 } 648 pid = fork(); 649 switch (pid) { 650 case 0: 651 /* XXX can we call err() in here? */ 652 if (norun) 653 _exit(0); 654 if (ofd != NULL) 655 if (dup2(pfd[1], STDOUT_FILENO) < 0) 656 err(1, "dup2"); 657 if (!loudsubs) { 658 nfd = open(_PATH_DEVNULL, O_RDWR); 659 if (nfd == -1) 660 err(1, "open: %s", _PATH_DEVNULL); 661 if (dup2(nfd, STDIN_FILENO) < 0) 662 err(1, "dup2"); 663 if (dup2dn) 664 if (dup2(nfd, STDOUT_FILENO) < 0) 665 err(1, "dup2"); 666 if (dup2(nfd, STDERR_FILENO) < 0) 667 err(1, "dup2"); 668 } 669 670 (void)execv(argv[0], argv); 671 warn("exec: %s", argv[0]); 672 _exit(-1); 673 case -1: 674 err(1, "fork"); 675 } 676 677 free(cmd); 678 free(argv); 679 while (waitpid(pid, &status, 0) != pid) 680 ; 681 return (WEXITSTATUS(status)); 682 } 683 684 static void 685 usage(void) 686 { 687 688 fprintf(stderr, 689 "usage: %s [-DLlMNnPStUX] [-a maxcontig] [-b block-size]\n" 690 "\t[-c blocks-per-cylinder-group][-d max-extent-size] [-E path-mdconfig]\n" 691 "\t[-e maxbpg] [-F file] [-f frag-size] [-i bytes] [-m percent-free]\n" 692 "\t[-O optimization] [-o mount-options]\n" 693 "\t[-p permissions] [-s size] [-v version] [-w user:group]\n" 694 "\tmd-device mount-point\n", getprogname()); 695 exit(1); 696 } 697