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