config.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@suse.de>
  23  */
  24
  25 #include        "mdadm.h"
  26 #include        "dlink.h"
  27 #include        <dirent.h>
  28 #include        <glob.h>
  29 #include        <fnmatch.h>
  30 #include        <ctype.h>
  31 #include        <pwd.h>
  32 #include        <grp.h>
  33
  34 /*
  35  * Read the config file
  36  *
  37  * conf_get_uuids gets a list of devicename+uuid pairs
  38  * conf_get_devs gets device names after expanding wildcards
  39  *
  40  * Each keeps the returned list and frees it when asked to make
  41  * a new list.
  42  *
  43  * The format of the config file needs to be fairly extensible.
  44  * Now, arrays only have names and uuids and devices merely are.
  45  * But later arrays might want names, and devices might want superblock
  46  * versions, and who knows what else.
  47  * I like free format, abhore backslash line continuation, adore
  48  *   indentation for structure and am ok about # comments.
  49  *
  50  * So, each line that isn't blank or a #comment must either start
  51  *  with a key word, and not be indented, or must start with a
  52  *  non-key-word and must be indented.
  53  *
  54  * Keywords are DEVICE and ARRAY ... and several others.
  55  * DEV{ICE} introduces some devices that might contain raid components.
  56  * e.g.
  57  *   DEV style=0 /dev/sda* /dev/hd*
  58  *   DEV style=1 /dev/sd[b-f]*
  59  * ARR{AY} describes an array giving md device and attributes like uuid=whatever
  60  * e.g.
  61  *   ARRAY /dev/md0 uuid=whatever name=something
  62  * Spaces separate words on each line.  Quoting, with "" or '' protects them,
  63  * but may not wrap over lines
  64  *
  65  */
  66 #ifndef _POSIX_C_SOURCE
  67 #define _POSIX_C_SOURCE 200809L
  68 #endif
  69
  70 #ifndef CONFFILE
  71 #define CONFFILE "/etc/mdadm.conf"
  72 #endif
  73 #ifndef CONFFILE2
  74 /* for Debian compatibility .... */
  75 #define CONFFILE2 "/etc/mdadm/mdadm.conf"
  76 #endif
  77 char DefaultConfFile[] = CONFFILE;
  78 char DefaultConfDir[] = CONFFILE ".d";
  79 char DefaultAltConfFile[] = CONFFILE2;
  80 char DefaultAltConfDir[] = CONFFILE2 ".d";
  81
  82 enum linetype { Devices, Array, Mailaddr, Mailfrom, Program, CreateDev,
  83                 Homehost, HomeCluster, AutoMode, Policy, PartPolicy, LTEnd };
  84 char *keywords[] = {
  85         [Devices]  = "devices",
  86         [Array]    = "array",
  87         [Mailaddr] = "mailaddr",
  88         [Mailfrom] = "mailfrom",
  89         [Program]  = "program",
  90         [CreateDev]= "create",
  91         [Homehost] = "homehost",
  92         [HomeCluster] = "homecluster",
  93         [AutoMode] = "auto",
  94         [Policy]   = "policy",
  95         [PartPolicy]="part-policy",
  96         [LTEnd]    = NULL
  97 };
  98
  99 /*
 100  * match_keyword returns an index into the keywords array, or -1 for no match
 101  * case is ignored, and at least three characters must be given
 102  */
 103
 104 int match_keyword(char *word)
 105 {
 106         int len = strlen(word);
 107         int n;
 108
 109         if (len < 3)
 110                 return -1;
 111         for (n = 0; keywords[n]; n++) {
 112                 if (strncasecmp(word, keywords[n], len) == 0)
 113                         return n;
 114         }
 115
 116         return -1;
 117 }
 118
 119 struct conf_dev {
 120         struct conf_dev *next;
 121         char *name;
 122 } *cdevlist = NULL;
 123
 124 struct mddev_dev *load_partitions(void)
 125 {
 126         FILE *f = fopen("/proc/partitions", "r");
 127         char buf[1024];
 128         struct mddev_dev *rv = NULL;
 129
 130         if (f == NULL) {
 131                 pr_err("cannot open /proc/partitions\n");
 132                 return NULL;
 133         }
 134         while (fgets(buf, 1024, f)) {
 135                 int major, minor;
 136                 char *name, *mp;
 137                 struct mddev_dev *d;
 138
 139                 buf[1023] = '\0';
 140                 if (buf[0] != ' ')
 141                         continue;
 142                 major = strtoul(buf, &mp, 10);
 143                 if (mp == buf || *mp != ' ')
 144                         continue;
 145                 minor = strtoul(mp, NULL, 10);
 146
 147                 name = map_dev(major, minor, 1);
 148                 if (!name)
 149                         continue;
 150                 d = xcalloc(1, sizeof(*d));
 151                 d->devname = xstrdup(name);
 152                 d->next = rv;
 153                 rv = d;
 154         }
 155         fclose(f);
 156         return rv;
 157 }
 158
 159 struct mddev_dev *load_containers(void)
 160 {
 161         struct mdstat_ent *mdstat = mdstat_read(0, 0);
 162         struct mdstat_ent *ent;
 163         struct mddev_dev *d;
 164         struct mddev_dev *rv = NULL;
 165         struct map_ent *map = NULL, *me;
 166
 167         if (!mdstat)
 168                 return NULL;
 169
 170         for (ent = mdstat; ent; ent = ent->next)
 171                 if (ent->metadata_version &&
 172                     strncmp(ent->metadata_version, "external:", 9) == 0 &&
 173                     !is_subarray(&ent->metadata_version[9])) {
 174                         d = xcalloc(1, sizeof(*d));
 175                         me = map_by_devnm(&map, ent->devnm);
 176                         if (me)
 177                                 d->devname = xstrdup(me->path);
 178                         else if (asprintf(&d->devname, "/dev/%s", ent->devnm) < 0) {
 179                                 free(d);
 180                                 continue;
 181                         }
 182                         d->next = rv;
 183                         rv = d;
 184                         map_free(map);
 185                         map = NULL;
 186                 }
 187         free_mdstat(mdstat);
 188
 189         return rv;
 190 }
 191
 192 struct createinfo createinfo = {
 193         .autof = 2, /* by default, create devices with standard names */
 194         .symlinks = 1,
 195         .names = 0, /* By default, stick with numbered md devices. */
 196         .bblist = 1, /* Use a bad block list by default */
 197 #ifdef DEBIAN
 198         .gid = 6, /* disk */
 199         .mode = 0660,
 200 #else
 201         .mode = 0600,
 202 #endif
 203 };
 204
 205 int parse_auto(char *str, char *msg, int config)
 206 {
 207         int autof;
 208         if (str == NULL || *str == 0)
 209                 autof = 2;
 210         else if (strcasecmp(str, "no") == 0)
 211                 autof = 1;
 212         else if (strcasecmp(str, "yes") == 0)
 213                 autof = 2;
 214         else if (strcasecmp(str, "md") == 0)
 215                 autof = config ? 5:3;
 216         else {
 217                 /* There might be digits, and maybe a hypen, at the end */
 218                 char *e = str + strlen(str);
 219                 int num = 4;
 220                 int len;
 221                 while (e > str && isdigit(e[-1]))
 222                         e--;
 223                 if (*e) {
 224                         num = atoi(e);
 225                         if (num <= 0)
 226                                 num = 1;
 227                 }
 228                 if (e > str && e[-1] == '-')
 229                         e--;
 230                 len = e - str;
 231                 if ((len == 2 && strncasecmp(str, "md", 2) == 0)) {
 232                         autof = config ? 5 : 3;
 233                 } else if ((len == 3 && strncasecmp(str, "yes", 3) == 0)) {
 234                         autof = 2;
 235                 } else if ((len == 3 && strncasecmp(str, "mdp", 3) == 0)) {
 236                         autof = config ? 6 : 4;
 237                 } else if ((len == 1 && strncasecmp(str, "p", 1) == 0) ||
 238                            (len >= 4 && strncasecmp(str, "part", 4) == 0)) {
 239                         autof = 6;
 240                 } else {
 241                         pr_err("%s arg of \"%s\" unrecognised: use no,yes,md,mdp,part\n"
 242                                 "        optionally followed by a number.\n",
 243                                 msg, str);
 244                         exit(2);
 245                 }
 246                 autof |= num << 3;
 247         }
 248         return autof;
 249 }
 250
 251 static void createline(char *line)
 252 {
 253         char *w;
 254         char *ep;
 255
 256         for (w = dl_next(line); w != line; w = dl_next(w)) {
 257                 if (strncasecmp(w, "auto=", 5) == 0)
 258                         createinfo.autof = parse_auto(w + 5, "auto=", 1);
 259                 else if (strncasecmp(w, "owner=", 6) == 0) {
 260                         if (w[6] == 0) {
 261                                 pr_err("missing owner name\n");
 262                                 continue;
 263                         }
 264                         createinfo.uid = strtoul(w + 6, &ep, 10);
 265                         if (*ep != 0) {
 266                                 struct passwd *pw;
 267                                 /* must be a name */
 268                                 pw = getpwnam(w + 6);
 269                                 if (pw)
 270                                         createinfo.uid = pw->pw_uid;
 271                                 else
 272                                         pr_err("CREATE user %s not found\n",
 273                                                w + 6);
 274                         }
 275                 } else if (strncasecmp(w, "group=", 6) == 0) {
 276                         if (w[6] == 0) {
 277                                 pr_err("missing group name\n");
 278                                 continue;
 279                         }
 280                         createinfo.gid = strtoul(w + 6, &ep, 10);
 281                         if (*ep != 0) {
 282                                 struct group *gr;
 283                                 /* must be a name */
 284                                 gr = getgrnam(w + 6);
 285                                 if (gr)
 286                                         createinfo.gid = gr->gr_gid;
 287                                 else
 288                                         pr_err("CREATE group %s not found\n",
 289                                                w + 6);
 290                         }
 291                 } else if (strncasecmp(w, "mode=", 5) == 0) {
 292                         if (w[5] == 0) {
 293                                 pr_err("missing CREATE mode\n");
 294                                 continue;
 295                         }
 296                         createinfo.mode = strtoul(w + 5, &ep, 8);
 297                         if (*ep != 0) {
 298                                 createinfo.mode = 0600;
 299                                 pr_err("unrecognised CREATE mode %s\n",
 300                                         w + 5);
 301                         }
 302                 } else if (strncasecmp(w, "metadata=", 9) == 0) {
 303                         /* style of metadata to use by default */
 304                         int i;
 305                         for (i = 0; superlist[i] && !createinfo.supertype; i++)
 306                                 createinfo.supertype = superlist[i]->match_metadata_desc(w + 9);
 307                         if (!createinfo.supertype)
 308                                 pr_err("metadata format %s unknown, ignoring\n",
 309                                         w+9);
 310                 } else if (strncasecmp(w, "symlinks=yes", 12) == 0)
 311                         createinfo.symlinks = 1;
 312                 else if  (strncasecmp(w, "symlinks=no", 11) == 0)
 313                         createinfo.symlinks = 0;
 314                 else if (strncasecmp(w, "names=yes", 12) == 0)
 315                         createinfo.names = 1;
 316                 else if  (strncasecmp(w, "names=no", 11) == 0)
 317                         createinfo.names = 0;
 318                 else if  (strncasecmp(w, "bbl=no", 11) == 0)
 319                         createinfo.bblist = 0;
 320                 else if  (strncasecmp(w, "bbl=yes", 11) == 0)
 321                         createinfo.bblist = 1;
 322                 else {
 323                         pr_err("unrecognised word on CREATE line: %s\n",
 324                                 w);
 325                 }
 326         }
 327 }
 328
 329 void devline(char *line)
 330 {
 331         char *w;
 332         struct conf_dev *cd;
 333
 334         for (w = dl_next(line); w != line; w = dl_next(w)) {
 335                 if (w[0] == '/' || strcasecmp(w, "partitions") == 0 ||
 336                     strcasecmp(w, "containers") == 0) {
 337                         cd = xmalloc(sizeof(*cd));
 338                         cd->name = xstrdup(w);
 339                         cd->next = cdevlist;
 340                         cdevlist = cd;
 341                 } else {
 342                         pr_err("unreconised word on DEVICE line: %s\n", w);
 343                 }
 344         }
 345 }
 346
 347 struct mddev_ident *mddevlist = NULL;
 348 struct mddev_ident **mddevlp = &mddevlist;
 349
 350 static int is_number(char *w)
 351 {
 352         /* check if there are 1 or more digits and nothing else */
 353         int digits = 0;
 354         while (*w && isdigit(*w)) {
 355                 digits++;
 356                 w++;
 357         }
 358         return (digits && ! *w);
 359 }
 360
 361 void arrayline(char *line)
 362 {
 363         char *w;
 364
 365         struct mddev_ident mis;
 366         struct mddev_ident *mi;
 367
 368         mis.uuid_set = 0;
 369         mis.super_minor = UnSet;
 370         mis.level = UnSet;
 371         mis.raid_disks = UnSet;
 372         mis.spare_disks = 0;
 373         mis.devices = NULL;
 374         mis.devname = NULL;
 375         mis.spare_group = NULL;
 376         mis.autof = 0;
 377         mis.next = NULL;
 378         mis.st = NULL;
 379         mis.bitmap_fd = -1;
 380         mis.bitmap_file = NULL;
 381         mis.name[0] = 0;
 382         mis.container = NULL;
 383         mis.member = NULL;
 384
 385         for (w = dl_next(line); w != line; w = dl_next(w)) {
 386                 if (w[0] == '/' || strchr(w, '=') == NULL) {
 387                         /* This names the device, or is '<ignore>'.
 388                          * The rules match those in create_mddev.
 389                          * 'w' must be:
 390                          *  /dev/md/{anything}
 391                          *  /dev/mdNN
 392                          *  /dev/md_dNN
 393                          *  <ignore>
 394                          *  or anything that doesn't start '/' or '<'
 395                          */
 396                         if (strcasecmp(w, "<ignore>") == 0 ||
 397                             strncmp(w, "/dev/md/", 8) == 0 ||
 398                             (w[0] != '/' && w[0] != '<') ||
 399                             (strncmp(w, "/dev/md", 7) == 0 &&
 400                              is_number(w + 7)) ||
 401                             (strncmp(w, "/dev/md_d", 9) == 0 &&
 402                              is_number(w + 9))) {
 403                                 /* This is acceptable */;
 404                                 if (mis.devname)
 405                                         pr_err("only give one device per ARRAY line: %s and %s\n",
 406                                                 mis.devname, w);
 407                                 else
 408                                         mis.devname = w;
 409                         }else {
 410                                 pr_err("%s is an invalid name for an md device - ignored.\n", w);
 411                         }
 412                 } else if (strncasecmp(w, "uuid=", 5) == 0) {
 413                         if (mis.uuid_set)
 414                                 pr_err("only specify uuid once, %s ignored.\n",
 415                                        w);
 416                         else {
 417                                 if (parse_uuid(w + 5, mis.uuid))
 418                                         mis.uuid_set = 1;
 419                                 else
 420                                         pr_err("bad uuid: %s\n", w);
 421                         }
 422                 } else if (strncasecmp(w, "super-minor=", 12) == 0) {
 423                         if (mis.super_minor != UnSet)
 424                                 pr_err("only specify super-minor once, %s ignored.\n",
 425                                         w);
 426                         else {
 427                                 char *endptr;
 428                                 int minor = strtol(w + 12, &endptr, 10);
 429
 430                                 if (w[12] == 0 || endptr[0] != 0 || minor < 0)
 431                                         pr_err("invalid super-minor number: %s\n",
 432                                                w);
 433                                 else
 434                                         mis.super_minor = minor;
 435                         }
 436                 } else if (strncasecmp(w, "name=", 5) == 0) {
 437                         if (mis.name[0])
 438                                 pr_err("only specify name once, %s ignored.\n",
 439                                         w);
 440                         else if (strlen(w + 5) > 32)
 441                                 pr_err("name too long, ignoring %s\n", w);
 442                         else
 443                                 strcpy(mis.name, w + 5);
 444
 445                 } else if (strncasecmp(w, "bitmap=", 7) == 0) {
 446                         if (mis.bitmap_file)
 447                                 pr_err("only specify bitmap file once. %s ignored\n",
 448                                         w);
 449                         else
 450                                 mis.bitmap_file = xstrdup(w + 7);
 451
 452                 } else if (strncasecmp(w, "devices=", 8 ) == 0) {
 453                         if (mis.devices)
 454                                 pr_err("only specify devices once (use a comma separated list). %s ignored\n",
 455                                         w);
 456                         else
 457                                 mis.devices = xstrdup(w + 8);
 458                 } else if (strncasecmp(w, "spare-group=", 12) == 0) {
 459                         if (mis.spare_group)
 460                                 pr_err("only specify one spare group per array. %s ignored.\n",
 461                                         w);
 462                         else
 463                                 mis.spare_group = xstrdup(w + 12);
 464                 } else if (strncasecmp(w, "level=", 6) == 0 ) {
 465                         /* this is mainly for compatability with --brief output */
 466                         mis.level = map_name(pers, w + 6);
 467                 } else if (strncasecmp(w, "disks=", 6) == 0) {
 468                         /* again, for compat */
 469                         mis.raid_disks = atoi(w + 6);
 470                 } else if (strncasecmp(w, "num-devices=", 12) == 0) {
 471                         /* again, for compat */
 472                         mis.raid_disks = atoi(w + 12);
 473                 } else if (strncasecmp(w, "spares=", 7) == 0) {
 474                         /* for warning if not all spares present */
 475                         mis.spare_disks = atoi(w + 7);
 476                 } else if (strncasecmp(w, "metadata=", 9) == 0) {
 477                         /* style of metadata on the devices. */
 478                         int i;
 479
 480                         for(i=0; superlist[i] && !mis.st; i++)
 481                                 mis.st = superlist[i]->
 482                                         match_metadata_desc(w + 9);
 483
 484                         if (!mis.st)
 485                                 pr_err("metadata format %s unknown, ignored.\n",
 486                                        w + 9);
 487                 } else if (strncasecmp(w, "auto=", 5) == 0 ) {
 488                         /* whether to create device special files as needed */
 489                         mis.autof = parse_auto(w + 5, "auto type", 0);
 490                 } else if (strncasecmp(w, "member=", 7) == 0) {
 491                         /* subarray within a container */
 492                         mis.member = xstrdup(w + 7);
 493                 } else if (strncasecmp(w, "container=", 10) == 0) {
 494                         /* The container holding this subarray.
 495                          * Either a device name or a uuid */
 496                         mis.container = xstrdup(w + 10);
 497                 } else {
 498                         pr_err("unrecognised word on ARRAY line: %s\n",
 499                                 w);
 500                 }
 501         }
 502         if (mis.uuid_set == 0 && mis.devices == NULL &&
 503             mis.super_minor == UnSet && mis.name[0] == 0 &&
 504             (mis.container == NULL || mis.member == NULL))
 505                 pr_err("ARRAY line %s has no identity information.\n",
 506                        mis.devname);
 507         else {
 508                 mi = xmalloc(sizeof(*mi));
 509                 *mi = mis;
 510                 mi->devname = mis.devname ? xstrdup(mis.devname) : NULL;
 511                 mi->next = NULL;
 512                 *mddevlp = mi;
 513                 mddevlp = &mi->next;
 514         }
 515 }
 516
 517 static char *alert_email = NULL;
 518 void mailline(char *line)
 519 {
 520         char *w;
 521
 522         for (w = dl_next(line); w != line; w = dl_next(w))
 523                 if (alert_email == NULL)
 524                         alert_email = xstrdup(w);
 525 }
 526
 527 static char *alert_mail_from = NULL;
 528 void mailfromline(char *line)
 529 {
 530         char *w;
 531
 532         for (w = dl_next(line); w != line; w = dl_next(w)) {
 533                 if (alert_mail_from == NULL)
 534                         alert_mail_from = xstrdup(w);
 535                 else {
 536                         char *t = NULL;
 537
 538                         if (xasprintf(&t, "%s %s", alert_mail_from, w) > 0) {
 539                                 free(alert_mail_from);
 540                                 alert_mail_from = t;
 541                         }
 542                 }
 543         }
 544 }
 545
 546 static char *alert_program = NULL;
 547 void programline(char *line)
 548 {
 549         char *w;
 550
 551         for (w = dl_next(line); w != line; w = dl_next(w))
 552                 if (alert_program == NULL)
 553                         alert_program = xstrdup(w);
 554 }
 555
 556 static char *home_host = NULL;
 557 static int require_homehost = 1;
 558 void homehostline(char *line)
 559 {
 560         char *w;
 561
 562         for (w = dl_next(line); w != line; w = dl_next(w)) {
 563                 if (strcasecmp(w, "<ignore>") == 0)
 564                         require_homehost = 0;
 565                 else if (home_host == NULL) {
 566                         if (strcasecmp(w, "<none>") == 0)
 567                                 home_host = xstrdup("");
 568                         else
 569                                 home_host = xstrdup(w);
 570                 }
 571         }
 572 }
 573
 574 static char *home_cluster = NULL;
 575 void homeclusterline(char *line)
 576 {
 577         char *w;
 578
 579         for (w = dl_next(line); w != line; w = dl_next(w)) {
 580                 if (home_cluster == NULL) {
 581                         if (strcasecmp(w, "<none>") == 0)
 582                                 home_cluster = xstrdup("");
 583                         else
 584                                 home_cluster = xstrdup(w);
 585                 }
 586         }
 587 }
 588
 589 char auto_yes[] = "yes";
 590 char auto_no[] = "no";
 591 char auto_homehost[] = "homehost";
 592
 593 static int auto_seen = 0;
 594 void autoline(char *line)
 595 {
 596         char *w;
 597         char *seen;
 598         int super_cnt;
 599         char *dflt = auto_yes;
 600         int homehost = 0;
 601         int i;
 602
 603         if (auto_seen)
 604                 return;
 605         auto_seen = 1;
 606
 607         /*
 608          * Parse the 'auto' line creating policy statements for the 'auto'
 609          * policy.
 610          *
 611          * The default is 'yes' but the 'auto' line might over-ride that.
 612          * Words in the line are processed in order with the first
 613          * match winning.
 614          * word can be:
 615          *   +version   - that version can be assembled
 616          *   -version   - that version cannot be auto-assembled
 617          *   yes or +all - any other version can be assembled
 618          *   no or -all  - no other version can be assembled.
 619          *   homehost   - any array associated by 'homehost' to this
 620          *                host can be assembled.
 621          *
 622          * Thus:
 623          *   +ddf -0.90 homehost -all
 624          * will auto-assemble any ddf array, no 0.90 array, and
 625          * any other array (imsm, 1.x) if and only if it is identified
 626          * as belonging to this host.
 627          *
 628          * We translate that to policy by creating 'auto=yes' when we see
 629          * a '+version' line, 'auto=no' if we see '-version' before 'homehost',
 630          * or 'auto=homehost' if we see '-version' after 'homehost'.
 631          * When we see yes, no, +all or -all we stop and any version that hasn't
 632          * been seen gets an appropriate auto= entry.
 633          */
 634
 635         /*
 636          * If environment variable MDADM_CONF_AUTO is defined, then
 637          * it is prepended to the auto line.  This allow a script
 638          * to easily disable some metadata types.
 639          */
 640         w = getenv("MDADM_CONF_AUTO");
 641         if (w && *w) {
 642                 char *l = xstrdup(w);
 643                 char *head = line;
 644                 w = strtok(l, " \t");
 645                 while (w) {
 646                         char *nw = dl_strdup(w);
 647                         dl_insert(head, nw);
 648                         head = nw;
 649                         w = strtok(NULL, " \t");
 650                 }
 651                 free(l);
 652         }
 653
 654         for (super_cnt = 0; superlist[super_cnt]; super_cnt++)
 655                 ;
 656         seen = xcalloc(super_cnt, 1);
 657
 658         for (w = dl_next(line); w != line; w = dl_next(w)) {
 659                 char *val;
 660
 661                 if (strcasecmp(w, "yes") == 0) {
 662                         dflt = auto_yes;
 663                         break;
 664                 }
 665                 if (strcasecmp(w, "no") == 0) {
 666                         if (homehost)
 667                                 dflt = auto_homehost;
 668                         else
 669                                 dflt = auto_no;
 670                         break;
 671                 }
 672                 if (strcasecmp(w, "homehost") == 0) {
 673                         homehost = 1;
 674                         continue;
 675                 }
 676                 if (w[0] == '+')
 677                         val = auto_yes;
 678                 else if (w[0] == '-') {
 679                         if (homehost)
 680                                 val = auto_homehost;
 681                         else
 682                                 val = auto_no;
 683                 } else
 684                         continue;
 685
 686                 if (strcasecmp(w + 1, "all") == 0) {
 687                         dflt = val;
 688                         break;
 689                 }
 690                 for (i = 0; superlist[i]; i++) {
 691                         const char *version = superlist[i]->name;
 692                         if (strcasecmp(w + 1, version) == 0)
 693                                 break;
 694                         /* 1 matches 1.x, 0 matches 0.90 */
 695                         if (version[1] == '.' && strlen(w + 1) == 1 &&
 696                             w[1] == version[0])
 697                                 break;
 698                         /* 1.anything matches 1.x */
 699                         if (strcmp(version, "1.x") == 0 &&
 700                             strncmp(w + 1, "1.", 2) == 0)
 701                                 break;
 702                 }
 703                 if (superlist[i] == NULL)
 704                         /* ignore this word */
 705                         continue;
 706                 if (seen[i])
 707                         /* already know about this metadata */
 708                         continue;
 709                 policy_add(rule_policy, pol_auto, val, pol_metadata,
 710                            superlist[i]->name, NULL);
 711                 seen[i] = 1;
 712         }
 713         for (i = 0; i < super_cnt; i++)
 714                 if (!seen[i])
 715                         policy_add(rule_policy, pol_auto, dflt, pol_metadata,
 716                                    superlist[i]->name, NULL);
 717
 718         free(seen);
 719 }
 720
 721 int loaded = 0;
 722
 723 static char *conffile = NULL;
 724 void set_conffile(char *file)
 725 {
 726         conffile = file;
 727 }
 728
 729 void conf_file(FILE *f)
 730 {
 731         char *line;
 732         while ((line = conf_line(f))) {
 733                 switch(match_keyword(line)) {
 734                 case Devices:
 735                         devline(line);
 736                         break;
 737                 case Array:
 738                         arrayline(line);
 739                         break;
 740                 case Mailaddr:
 741                         mailline(line);
 742                         break;
 743                 case Mailfrom:
 744                         mailfromline(line);
 745                         break;
 746                 case Program:
 747                         programline(line);
 748                         break;
 749                 case CreateDev:
 750                         createline(line);
 751                         break;
 752                 case Homehost:
 753                         homehostline(line);
 754                         break;
 755                 case HomeCluster:
 756                         homeclusterline(line);
 757                         break;
 758                 case AutoMode:
 759                         autoline(line);
 760                         break;
 761                 case Policy:
 762                         policyline(line, rule_policy);
 763                         break;
 764                 case PartPolicy:
 765                         policyline(line, rule_part);
 766                         break;
 767                 default:
 768                         pr_err("Unknown keyword %s\n", line);
 769                 }
 770                 free_line(line);
 771         }
 772 }
 773
 774 struct fname {
 775         struct fname *next;
 776         char name[];
 777 };
 778
 779 void conf_file_or_dir(FILE *f)
 780 {
 781         struct stat st;
 782         DIR *dir;
 783         struct dirent *dp;
 784         struct fname *list = NULL;
 785
 786         fstat(fileno(f), &st);
 787         if (S_ISREG(st.st_mode))
 788                 conf_file(f);
 789         else if (!S_ISDIR(st.st_mode))
 790                 return;
 791 #if _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
 792         dir = fdopendir(fileno(f));
 793         if (!dir)
 794                 return;
 795         while ((dp = readdir(dir)) != NULL) {
 796                 int l;
 797                 struct fname *fn, **p;
 798                 if (dp->d_ino == 0)
 799                         continue;
 800                 if (dp->d_name[0] == '.')
 801                         continue;
 802                 l = strlen(dp->d_name);
 803                 if (l < 6 || strcmp(dp->d_name + l - 5, ".conf") != 0)
 804                         continue;
 805                 fn = xmalloc(sizeof(*fn) + l + 1);
 806                 strcpy(fn->name, dp->d_name);
 807                 for (p = &list;
 808                      *p && strcmp((*p)->name, fn->name) < 0;
 809                      p = & (*p)->next)
 810                         ;
 811                 fn->next = *p;
 812                 *p = fn;
 813         }
 814         while (list) {
 815                 int fd;
 816                 FILE *f2;
 817                 struct fname *fn = list;
 818                 list = list->next;
 819                 fd = openat(fileno(f), fn->name, O_RDONLY);
 820                 free(fn);
 821                 if (fd < 0)
 822                         continue;
 823                 f2 = fdopen(fd, "r");
 824                 if (!f2) {
 825                         close(fd);
 826                         continue;
 827                 }
 828                 conf_file(f2);
 829                 fclose(f2);
 830         }
 831         closedir(dir);
 832 #endif
 833 }
 834
 835 void load_conffile(void)
 836 {
 837         FILE *f;
 838         char *confdir = NULL;
 839         char *head;
 840
 841         if (loaded)
 842                 return;
 843         if (conffile == NULL) {
 844                 conffile = DefaultConfFile;
 845                 confdir = DefaultConfDir;
 846         }
 847
 848         if (strcmp(conffile, "partitions") == 0) {
 849                 char *list = dl_strdup("DEV");
 850                 dl_init(list);
 851                 dl_add(list, dl_strdup("partitions"));
 852                 devline(list);
 853                 free_line(list);
 854         } else if (strcmp(conffile, "none") != 0) {
 855                 f = fopen(conffile, "r");
 856                 /* Debian chose to relocate mdadm.conf into /etc/mdadm/.
 857                  * To allow Debian users to compile from clean source and still
 858                  * have a working mdadm, we read /etc/mdadm/mdadm.conf
 859                  * if /etc/mdadm.conf doesn't exist
 860                  */
 861                 if (f == NULL && conffile == DefaultConfFile) {
 862                         f = fopen(DefaultAltConfFile, "r");
 863                         if (f) {
 864                                 conffile = DefaultAltConfFile;
 865                                 confdir = DefaultAltConfDir;
 866                         }
 867                 }
 868                 if (f) {
 869                         conf_file_or_dir(f);
 870                         fclose(f);
 871                 }
 872                 if (confdir) {
 873                         f = fopen(confdir, "r");
 874                         if (f) {
 875                                 conf_file_or_dir(f);
 876                                 fclose(f);
 877                         }
 878                 }
 879         }
 880         /* If there was no AUTO line, process an empty line
 881          * now so that the MDADM_CONF_AUTO env var gets processed.
 882          */
 883         head = dl_strdup("AUTO");
 884         dl_init(head);
 885         autoline(head);
 886         free_line(head);
 887
 888         loaded = 1;
 889 }
 890
 891 char *conf_get_mailaddr(void)
 892 {
 893         load_conffile();
 894         return alert_email;
 895 }
 896
 897 char *conf_get_mailfrom(void)
 898 {
 899         load_conffile();
 900         return alert_mail_from;
 901 }
 902
 903 char *conf_get_program(void)
 904 {
 905         load_conffile();
 906         return alert_program;
 907 }
 908
 909 char *conf_get_homehost(int *require_homehostp)
 910 {
 911         load_conffile();
 912         if (require_homehostp)
 913                 *require_homehostp = require_homehost;
 914         return home_host;
 915 }
 916
 917 char *conf_get_homecluster(void)
 918 {
 919         load_conffile();
 920         return home_cluster;
 921 }
 922
 923 struct createinfo *conf_get_create_info(void)
 924 {
 925         load_conffile();
 926         return &createinfo;
 927 }
 928
 929 struct mddev_ident *conf_get_ident(char *dev)
 930 {
 931         struct mddev_ident *rv;
 932         load_conffile();
 933         rv = mddevlist;
 934         while (dev && rv && (rv->devname == NULL ||
 935                              !devname_matches(dev, rv->devname)))
 936                 rv = rv->next;
 937         return rv;
 938 }
 939
 940 static void append_dlist(struct mddev_dev **dlp, struct mddev_dev *list)
 941 {
 942         while (*dlp)
 943                 dlp = &(*dlp)->next;
 944         *dlp = list;
 945 }
 946
 947 struct mddev_dev *conf_get_devs()
 948 {
 949         glob_t globbuf;
 950         struct conf_dev *cd;
 951         int flags = 0;
 952         static struct mddev_dev *dlist = NULL;
 953         unsigned int i;
 954
 955         while (dlist) {
 956                 struct mddev_dev *t = dlist;
 957                 dlist = dlist->next;
 958                 free(t->devname);
 959                 free(t);
 960         }
 961
 962         load_conffile();
 963
 964         if (cdevlist == NULL) {
 965                 /* default to 'partitions' and 'containers' */
 966                 dlist = load_partitions();
 967                 append_dlist(&dlist, load_containers());
 968         }
 969
 970         for (cd = cdevlist; cd; cd = cd->next) {
 971                 if (strcasecmp(cd->name, "partitions") == 0)
 972                         append_dlist(&dlist, load_partitions());
 973                 else if (strcasecmp(cd->name, "containers") == 0)
 974                         append_dlist(&dlist, load_containers());
 975                 else {
 976                         glob(cd->name, flags, NULL, &globbuf);
 977                         flags |= GLOB_APPEND;
 978                 }
 979         }
 980         if (flags & GLOB_APPEND) {
 981                 for (i = 0; i < globbuf.gl_pathc; i++) {
 982                         struct mddev_dev *t;
 983                         t = xcalloc(1, sizeof(*t));
 984                         t->devname = xstrdup(globbuf.gl_pathv[i]);
 985                         t->next = dlist;
 986                         dlist = t;
 987 /*      printf("one dev is %s\n", t->devname);*/
 988                 }
 989                 globfree(&globbuf);
 990         }
 991
 992         return dlist;
 993 }
 994
 995 int conf_test_dev(char *devname)
 996 {
 997         struct conf_dev *cd;
 998         if (cdevlist == NULL)
 999                 /* allow anything by default */
1000                 return 1;
1001         for (cd = cdevlist; cd; cd = cd->next) {
1002                 if (strcasecmp(cd->name, "partitions") == 0)
1003                         return 1;
1004                 if (fnmatch(cd->name, devname, FNM_PATHNAME) == 0)
1005                         return 1;
1006         }
1007         return 0;
1008 }
1009
1010 int conf_test_metadata(const char *version, struct dev_policy *pol, int is_homehost)
1011 {
1012         /* If anyone said 'yes', that sticks.
1013          * else if homehost applies, use that
1014          * else if there is a 'no', say 'no'.
1015          * else 'yes'.
1016          */
1017         struct dev_policy *p;
1018         int no = 0, found_homehost = 0;
1019         load_conffile();
1020
1021         pol = pol_find(pol, pol_auto);
1022         pol_for_each(p, pol, version) {
1023                 if (strcmp(p->value, "yes") == 0)
1024                         return 1;
1025                 if (strcmp(p->value, "homehost") == 0)
1026                         found_homehost = 1;
1027                 if (strcmp(p->value, "no") == 0)
1028                         no = 1;
1029         }
1030         if (is_homehost && found_homehost)
1031                 return 1;
1032         if (no)
1033                 return 0;
1034         return 1;
1035 }
1036
1037 int match_oneof(char *devices, char *devname)
1038 {
1039         /* check if one of the comma separated patterns in devices
1040          * matches devname
1041          */
1042
1043         while (devices && *devices) {
1044                 char patn[1024];
1045                 char *p = devices;
1046                 devices = strchr(devices, ',');
1047                 if (!devices)
1048                         devices = p + strlen(p);
1049                 if (devices-p < 1024) {
1050                         strncpy(patn, p, devices - p);
1051                         patn[devices-p] = 0;
1052                         if (fnmatch(patn, devname, FNM_PATHNAME) == 0)
1053                                 return 1;
1054                 }
1055                 if (*devices == ',')
1056                         devices++;
1057         }
1058         return 0;
1059 }
1060
1061 int devname_matches(char *name, char *match)
1062 {
1063         /* See if the given array name matches the
1064          * given match from config file.
1065          *
1066          * First strip and /dev/md/ or /dev/, then
1067          * see if there might be a numeric match of
1068          *  mdNN with NN
1069          * then just strcmp
1070          */
1071         if (strncmp(name, "/dev/md/", 8) == 0)
1072                 name += 8;
1073         else if (strncmp(name, "/dev/", 5) == 0)
1074                 name += 5;
1075
1076         if (strncmp(match, "/dev/md/", 8) == 0)
1077                 match += 8;
1078         else if (strncmp(match, "/dev/", 5) == 0)
1079                 match += 5;
1080
1081         if (strncmp(name, "md", 2) == 0 && isdigit(name[2]))
1082                 name += 2;
1083         if (strncmp(match, "md", 2) == 0 && isdigit(match[2]))
1084                 match += 2;
1085
1086         return (strcmp(name, match) == 0);
1087 }
1088
1089 int conf_name_is_free(char *name)
1090 {
1091         /* Check if this name is already taken by an ARRAY entry in
1092          * the config file.
1093          * It can be taken either by a match on devname, name, or
1094          * even super-minor.
1095          */
1096         struct mddev_ident *dev;
1097
1098         load_conffile();
1099         for (dev = mddevlist; dev; dev = dev->next) {
1100                 char nbuf[100];
1101                 if (dev->devname && devname_matches(name, dev->devname))
1102                         return 0;
1103                 if (dev->name[0] && devname_matches(name, dev->name))
1104                         return 0;
1105                 sprintf(nbuf, "%d", dev->super_minor);
1106                 if (dev->super_minor != UnSet && devname_matches(name, nbuf))
1107                         return 0;
1108         }
1109         return 1;
1110 }
1111
1112 struct mddev_ident *conf_match(struct supertype *st,
1113                                struct mdinfo *info,
1114                                char *devname,
1115                                int verbose, int *rvp)
1116 {
1117         struct mddev_ident *array_list, *match;
1118         array_list = conf_get_ident(NULL);
1119         match = NULL;
1120         for (; array_list; array_list = array_list->next) {
1121                 if (array_list->uuid_set &&
1122                     same_uuid(array_list->uuid, info->uuid,
1123                               st->ss->swapuuid) == 0) {
1124                         if (verbose >= 2 && array_list->devname)
1125                                 pr_err("UUID differs from %s.\n",
1126                                        array_list->devname);
1127                         continue;
1128                 }
1129                 if (array_list->name[0] &&
1130                     strcasecmp(array_list->name, info->name) != 0) {
1131                         if (verbose >= 2 && array_list->devname)
1132                                 pr_err("Name differs from %s.\n",
1133                                        array_list->devname);
1134                         continue;
1135                 }
1136                 if (array_list->devices && devname &&
1137                     !match_oneof(array_list->devices, devname)) {
1138                         if (verbose >= 2 && array_list->devname)
1139                                 pr_err("Not a listed device for %s.\n",
1140                                        array_list->devname);
1141                         continue;
1142                 }
1143                 if (array_list->super_minor != UnSet &&
1144                     array_list->super_minor != info->array.md_minor) {
1145                         if (verbose >= 2 && array_list->devname)
1146                                 pr_err("Different super-minor to %s.\n",
1147                                        array_list->devname);
1148                         continue;
1149                 }
1150                 if (!array_list->uuid_set && !array_list->name[0] &&
1151                     !array_list->devices && array_list->super_minor == UnSet) {
1152                         if (verbose >= 2 && array_list->devname)
1153                                 pr_err("%s doesn't have any identifying information.\n",
1154                                        array_list->devname);
1155                         continue;
1156                 }
1157                 /* FIXME, should I check raid_disks and level too?? */
1158
1159                 if (match) {
1160                         if (verbose >= 0) {
1161                                 if (match->devname && array_list->devname)
1162                                         pr_err("we match both %s and %s - cannot decide which to use.\n",
1163                                                match->devname,
1164                                                array_list->devname);
1165                                 else
1166                                         pr_err("multiple lines in mdadm.conf match\n");
1167                         }
1168                         if (rvp)
1169                                 *rvp = 2;
1170                         match = NULL;
1171                         break;
1172                 }
1173                 match = array_list;
1174         }
1175         return match;
1176 }
1177
1178 int conf_verify_devnames(struct mddev_ident *array_list)
1179 {
1180         struct mddev_ident *a1, *a2;
1181
1182         for (a1 = array_list; a1; a1 = a1->next) {
1183                 if (!a1->devname)
1184                         continue;
1185                 if (strcmp(a1->devname, "<ignore>") == 0)
1186                         continue;
1187                 for (a2 = a1->next; a2; a2 = a2->next) {
1188                         if (!a2->devname)
1189                                 continue;
1190                         if (strcmp(a1->devname, a2->devname) != 0)
1191                                 continue;
1192
1193                         if (a1->uuid_set && a2->uuid_set) {
1194                                 char nbuf[64];
1195                                 __fname_from_uuid(a1->uuid, 0, nbuf, ':');
1196                                 pr_err("Devices %s and ",
1197                                        nbuf);
1198                                 __fname_from_uuid(a2->uuid, 0, nbuf, ':');
1199                                 fprintf(stderr,
1200                                         "%s have the same name: %s\n",
1201                                         nbuf, a1->devname);
1202                         } else
1203                                 pr_err("Device %s given twice in config file\n", a1->devname);
1204                         return 1;
1205                 }
1206         }
1207
1208         return 0;
1209 }