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