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