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, Sysfs,
  84                 MonitorDelay, LTEnd };
  85 char *keywords[] = {
  86         [Devices]  = "devices",
  87         [Array]    = "array",
  88         [Mailaddr] = "mailaddr",
  89         [Mailfrom] = "mailfrom",
  90         [Program]  = "program",
  91         [CreateDev]= "create",
  92         [Homehost] = "homehost",
  93         [HomeCluster] = "homecluster",
  94         [AutoMode] = "auto",
  95         [Policy]   = "policy",
  96         [PartPolicy]="part-policy",
  97         [Sysfs]    = "sysfs",
  98         [MonitorDelay] = "monitordelay",
  99         [LTEnd]    = NULL
 100 };
 101
 102 /*
 103  * match_keyword returns an index into the keywords array, or -1 for no match
 104  * case is ignored, and at least three characters must be given
 105  */
 106
 107 int match_keyword(char *word)
 108 {
 109         int len = strlen(word);
 110         int n;
 111
 112         if (len < 3)
 113                 return -1;
 114         for (n = 0; keywords[n]; n++) {
 115                 if (strncasecmp(word, keywords[n], len) == 0)
 116                         return n;
 117         }
 118
 119         return -1;
 120 }
 121
 122 /**
 123  * is_devname_ignore() - check if &devname is a special "<ignore>" keyword.
 124  */
 125 bool is_devname_ignore(char *devname)
 126 {
 127         static const char keyword[] = "<ignore>";
 128
 129         if (strcasecmp(devname, keyword) == 0)
 130                 return true;
 131         return false;
 132 }
 133
 134 /**
 135  * ident_init() - Set defaults.
 136  * @ident: ident pointer, not NULL.
 137  */
 138 inline void ident_init(struct mddev_ident *ident)
 139 {
 140         assert(ident);
 141
 142         ident->assembled = false;
 143         ident->autof = 0;
 144         ident->bitmap_fd = -1;
 145         ident->bitmap_file = NULL;
 146         ident->container = NULL;
 147         ident->devices = NULL;
 148         ident->devname = NULL;
 149         ident->level = UnSet;
 150         ident->member = NULL;
 151         ident->name[0] = 0;
 152         ident->next = NULL;
 153         ident->raid_disks = UnSet;
 154         ident->spare_group = NULL;
 155         ident->spare_disks = 0;
 156         ident->st = NULL;
 157         ident->super_minor = UnSet;
 158         ident->uuid[0] = 0;
 159         ident->uuid_set = 0;
 160 }
 161
 162 struct conf_dev {
 163         struct conf_dev *next;
 164         char *name;
 165 } *cdevlist = NULL;
 166
 167 struct mddev_dev *load_partitions(void)
 168 {
 169         FILE *f = fopen("/proc/partitions", "r");
 170         char buf[1024];
 171         struct mddev_dev *rv = NULL;
 172
 173         if (f == NULL) {
 174                 pr_err("cannot open /proc/partitions\n");
 175                 return NULL;
 176         }
 177         while (fgets(buf, 1024, f)) {
 178                 int major, minor;
 179                 char *name, *mp;
 180                 struct mddev_dev *d;
 181
 182                 buf[1023] = '\0';
 183                 if (buf[0] != ' ')
 184                         continue;
 185                 major = strtoul(buf, &mp, 10);
 186                 if (mp == buf || *mp != ' ')
 187                         continue;
 188                 minor = strtoul(mp, NULL, 10);
 189
 190                 name = map_dev(major, minor, 1);
 191                 if (!name)
 192                         continue;
 193                 d = xcalloc(1, sizeof(*d));
 194                 d->devname = xstrdup(name);
 195                 d->next = rv;
 196                 rv = d;
 197         }
 198         fclose(f);
 199         return rv;
 200 }
 201
 202 struct mddev_dev *load_containers(void)
 203 {
 204         struct mdstat_ent *mdstat = mdstat_read(0, 0);
 205         struct mdstat_ent *ent;
 206         struct mddev_dev *d;
 207         struct mddev_dev *rv = NULL;
 208         struct map_ent *map = NULL, *me;
 209
 210         if (!mdstat)
 211                 return NULL;
 212
 213         for (ent = mdstat; ent; ent = ent->next)
 214                 if (ent->metadata_version &&
 215                     strncmp(ent->metadata_version, "external:", 9) == 0 &&
 216                     !is_subarray(&ent->metadata_version[9])) {
 217                         d = xcalloc(1, sizeof(*d));
 218                         me = map_by_devnm(&map, ent->devnm);
 219                         if (me)
 220                                 d->devname = xstrdup(me->path);
 221                         else if (asprintf(&d->devname, "/dev/%s", ent->devnm) < 0) {
 222                                 free(d);
 223                                 continue;
 224                         }
 225                         d->next = rv;
 226                         rv = d;
 227                         map_free(map);
 228                         map = NULL;
 229                 }
 230         free_mdstat(mdstat);
 231
 232         return rv;
 233 }
 234
 235 struct createinfo createinfo = {
 236         .autof = 2, /* by default, create devices with standard names */
 237         .names = 0, /* By default, stick with numbered md devices. */
 238         .bblist = 1, /* Use a bad block list by default */
 239 #ifdef DEBIAN
 240         .gid = 6, /* disk */
 241         .mode = 0660,
 242 #else
 243         .mode = 0600,
 244 #endif
 245 };
 246
 247 int parse_auto(char *str, char *msg, int config)
 248 {
 249         int autof;
 250         if (str == NULL || *str == 0)
 251                 autof = 2;
 252         else if (strcasecmp(str, "no") == 0)
 253                 autof = 1;
 254         else if (strcasecmp(str, "yes") == 0)
 255                 autof = 2;
 256         else if (strcasecmp(str, "md") == 0)
 257                 autof = config ? 5:3;
 258         else {
 259                 /* There might be digits, and maybe a hypen, at the end */
 260                 char *e = str + strlen(str);
 261                 int num = 4;
 262                 int len;
 263                 while (e > str && isdigit(e[-1]))
 264                         e--;
 265                 if (*e) {
 266                         num = atoi(e);
 267                         if (num <= 0)
 268                                 num = 1;
 269                 }
 270                 if (e > str && e[-1] == '-')
 271                         e--;
 272                 len = e - str;
 273                 if ((len == 2 && strncasecmp(str, "md", 2) == 0)) {
 274                         autof = config ? 5 : 3;
 275                 } else if ((len == 3 && strncasecmp(str, "yes", 3) == 0)) {
 276                         autof = 2;
 277                 } else if ((len == 3 && strncasecmp(str, "mdp", 3) == 0)) {
 278                         autof = config ? 6 : 4;
 279                 } else if ((len == 1 && strncasecmp(str, "p", 1) == 0) ||
 280                            (len >= 4 && strncasecmp(str, "part", 4) == 0)) {
 281                         autof = 6;
 282                 } else {
 283                         pr_err("%s arg of \"%s\" unrecognised: use no,yes,md,mdp,part\n"
 284                                 "        optionally followed by a number.\n",
 285                                 msg, str);
 286                         exit(2);
 287                 }
 288                 autof |= num << 3;
 289         }
 290         return autof;
 291 }
 292
 293 static void createline(char *line)
 294 {
 295         char *w;
 296         char *ep;
 297
 298         for (w = dl_next(line); w != line; w = dl_next(w)) {
 299                 if (strncasecmp(w, "auto=", 5) == 0)
 300                         createinfo.autof = parse_auto(w + 5, "auto=", 1);
 301                 else if (strncasecmp(w, "owner=", 6) == 0) {
 302                         if (w[6] == 0) {
 303                                 pr_err("missing owner name\n");
 304                                 continue;
 305                         }
 306                         createinfo.uid = strtoul(w + 6, &ep, 10);
 307                         if (*ep != 0) {
 308                                 struct passwd *pw;
 309                                 /* must be a name */
 310                                 pw = getpwnam(w + 6);
 311                                 if (pw)
 312                                         createinfo.uid = pw->pw_uid;
 313                                 else
 314                                         pr_err("CREATE user %s not found\n",
 315                                                w + 6);
 316                         }
 317                 } else if (strncasecmp(w, "group=", 6) == 0) {
 318                         if (w[6] == 0) {
 319                                 pr_err("missing group name\n");
 320                                 continue;
 321                         }
 322                         createinfo.gid = strtoul(w + 6, &ep, 10);
 323                         if (*ep != 0) {
 324                                 struct group *gr;
 325                                 /* must be a name */
 326                                 gr = getgrnam(w + 6);
 327                                 if (gr)
 328                                         createinfo.gid = gr->gr_gid;
 329                                 else
 330                                         pr_err("CREATE group %s not found\n",
 331                                                w + 6);
 332                         }
 333                 } else if (strncasecmp(w, "mode=", 5) == 0) {
 334                         if (w[5] == 0) {
 335                                 pr_err("missing CREATE mode\n");
 336                                 continue;
 337                         }
 338                         createinfo.mode = strtoul(w + 5, &ep, 8);
 339                         if (*ep != 0) {
 340                                 createinfo.mode = 0600;
 341                                 pr_err("unrecognised CREATE mode %s\n",
 342                                         w + 5);
 343                         }
 344                 } else if (strncasecmp(w, "metadata=", 9) == 0) {
 345                         /* style of metadata to use by default */
 346                         int i;
 347                         for (i = 0; superlist[i] && !createinfo.supertype; i++)
 348                                 createinfo.supertype = superlist[i]->match_metadata_desc(w + 9);
 349                         if (!createinfo.supertype)
 350                                 pr_err("metadata format %s unknown, ignoring\n",
 351                                         w+9);
 352                 } else if (strncasecmp(w, "names=yes", 12) == 0)
 353                         createinfo.names = 1;
 354                 else if  (strncasecmp(w, "names=no", 11) == 0)
 355                         createinfo.names = 0;
 356                 else if  (strncasecmp(w, "bbl=no", 11) == 0)
 357                         createinfo.bblist = 0;
 358                 else if  (strncasecmp(w, "bbl=yes", 11) == 0)
 359                         createinfo.bblist = 1;
 360                 else {
 361                         pr_err("unrecognised word on CREATE line: %s\n",
 362                                 w);
 363                 }
 364         }
 365 }
 366
 367 void devline(char *line)
 368 {
 369         char *w;
 370         struct conf_dev *cd;
 371
 372         for (w = dl_next(line); w != line; w = dl_next(w)) {
 373                 if (w[0] == '/' || strcasecmp(w, "partitions") == 0 ||
 374                     strcasecmp(w, "containers") == 0) {
 375                         cd = xmalloc(sizeof(*cd));
 376                         cd->name = xstrdup(w);
 377                         cd->next = cdevlist;
 378                         cdevlist = cd;
 379                 } else {
 380                         pr_err("unreconised word on DEVICE line: %s\n", w);
 381                 }
 382         }
 383 }
 384
 385 struct mddev_ident *mddevlist = NULL;
 386 struct mddev_ident **mddevlp = &mddevlist;
 387
 388 void arrayline(char *line)
 389 {
 390         char *w;
 391
 392         struct mddev_ident mis;
 393         struct mddev_ident *mi;
 394
 395         ident_init(&mis);
 396
 397         for (w = dl_next(line); w != line; w = dl_next(w)) {
 398                 if (w[0] == '/' || strchr(w, '=') == NULL) {
 399                         /* This names the device, or is '<ignore>'.
 400                          * The rules match those in create_mddev.
 401                          * 'w' must be:
 402                          *  /dev/md/{anything}
 403                          *  /dev/mdNN
 404                          *  /dev/md_dNN
 405                          *  <ignore>
 406                          *  or anything that doesn't start '/' or '<'
 407                          */
 408                         if (is_devname_ignore(w) == true ||
 409                             strncmp(w, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0 ||
 410                             (w[0] != '/' && w[0] != '<') ||
 411                             is_devname_md_numbered(w) == true ||
 412                             is_devname_md_d_numbered(w) == true) {
 413                                 /* This is acceptable */;
 414                                 if (mis.devname)
 415                                         pr_err("only give one device per ARRAY line: %s and %s\n",
 416                                                 mis.devname, w);
 417                                 else
 418                                         mis.devname = w;
 419                         }else {
 420                                 pr_err("%s is an invalid name for an md device - ignored.\n", w);
 421                         }
 422                 } else if (strncasecmp(w, "uuid=", 5) == 0) {
 423                         if (mis.uuid_set)
 424                                 pr_err("only specify uuid once, %s ignored.\n",
 425                                        w);
 426                         else {
 427                                 if (parse_uuid(w + 5, mis.uuid))
 428                                         mis.uuid_set = 1;
 429                                 else
 430                                         pr_err("bad uuid: %s\n", w);
 431                         }
 432                 } else if (strncasecmp(w, "super-minor=", 12) == 0) {
 433                         if (mis.super_minor != UnSet)
 434                                 pr_err("only specify super-minor once, %s ignored.\n",
 435                                         w);
 436                         else {
 437                                 char *endptr;
 438                                 int minor = strtol(w + 12, &endptr, 10);
 439
 440                                 if (w[12] == 0 || endptr[0] != 0 || minor < 0)
 441                                         pr_err("invalid super-minor number: %s\n",
 442                                                w);
 443                                 else
 444                                         mis.super_minor = minor;
 445                         }
 446                 } else if (strncasecmp(w, "name=", 5) == 0) {
 447                         if (mis.name[0])
 448                                 pr_err("only specify name once, %s ignored.\n",
 449                                         w);
 450                         else if (strlen(w + 5) > 32)
 451                                 pr_err("name too long, ignoring %s\n", w);
 452                         else
 453                                 strcpy(mis.name, w + 5);
 454
 455                 } else if (strncasecmp(w, "bitmap=", 7) == 0) {
 456                         if (mis.bitmap_file)
 457                                 pr_err("only specify bitmap file once. %s ignored\n",
 458                                         w);
 459                         else
 460                                 mis.bitmap_file = xstrdup(w + 7);
 461
 462                 } else if (strncasecmp(w, "devices=", 8 ) == 0) {
 463                         if (mis.devices)
 464                                 pr_err("only specify devices once (use a comma separated list). %s ignored\n",
 465                                         w);
 466                         else
 467                                 mis.devices = xstrdup(w + 8);
 468                 } else if (strncasecmp(w, "spare-group=", 12) == 0) {
 469                         if (mis.spare_group)
 470                                 pr_err("only specify one spare group per array. %s ignored.\n",
 471                                         w);
 472                         else
 473                                 mis.spare_group = xstrdup(w + 12);
 474                 } else if (strncasecmp(w, "level=", 6) == 0 ) {
 475                         /* this is mainly for compatability with --brief output */
 476                         mis.level = map_name(pers, w + 6);
 477                 } else if (strncasecmp(w, "disks=", 6) == 0) {
 478                         /* again, for compat */
 479                         mis.raid_disks = atoi(w + 6);
 480                 } else if (strncasecmp(w, "num-devices=", 12) == 0) {
 481                         /* again, for compat */
 482                         mis.raid_disks = atoi(w + 12);
 483                 } else if (strncasecmp(w, "spares=", 7) == 0) {
 484                         /* for warning if not all spares present */
 485                         mis.spare_disks = atoi(w + 7);
 486                 } else if (strncasecmp(w, "metadata=", 9) == 0) {
 487                         /* style of metadata on the devices. */
 488                         int i;
 489
 490                         for(i=0; superlist[i] && !mis.st; i++)
 491                                 mis.st = superlist[i]->
 492                                         match_metadata_desc(w + 9);
 493
 494                         if (!mis.st)
 495                                 pr_err("metadata format %s unknown, ignored.\n",
 496                                        w + 9);
 497                 } else if (strncasecmp(w, "auto=", 5) == 0 ) {
 498                         /* whether to create device special files as needed */
 499                         mis.autof = parse_auto(w + 5, "auto type", 0);
 500                 } else if (strncasecmp(w, "member=", 7) == 0) {
 501                         /* subarray within a container */
 502                         mis.member = xstrdup(w + 7);
 503                 } else if (strncasecmp(w, "container=", 10) == 0) {
 504                         /* The container holding this subarray.
 505                          * Either a device name or a uuid */
 506                         mis.container = xstrdup(w + 10);
 507                 } else {
 508                         pr_err("unrecognised word on ARRAY line: %s\n",
 509                                 w);
 510                 }
 511         }
 512         if (mis.uuid_set == 0 && mis.devices == NULL &&
 513             mis.super_minor == UnSet && mis.name[0] == 0 &&
 514             (mis.container == NULL || mis.member == NULL))
 515                 pr_err("ARRAY line %s has no identity information.\n",
 516                        mis.devname);
 517         else {
 518                 mi = xmalloc(sizeof(*mi));
 519                 *mi = mis;
 520                 mi->devname = mis.devname ? xstrdup(mis.devname) : NULL;
 521                 mi->next = NULL;
 522                 *mddevlp = mi;
 523                 mddevlp = &mi->next;
 524         }
 525 }
 526
 527 static char *alert_email = NULL;
 528 void mailline(char *line)
 529 {
 530         char *w;
 531
 532         for (w = dl_next(line); w != line; w = dl_next(w))
 533                 if (alert_email == NULL)
 534                         alert_email = xstrdup(w);
 535 }
 536
 537 static char *alert_mail_from = NULL;
 538 void mailfromline(char *line)
 539 {
 540         char *w;
 541
 542         for (w = dl_next(line); w != line; w = dl_next(w)) {
 543                 if (alert_mail_from == NULL)
 544                         alert_mail_from = xstrdup(w);
 545                 else {
 546                         char *t = NULL;
 547
 548                         if (xasprintf(&t, "%s %s", alert_mail_from, w) > 0) {
 549                                 free(alert_mail_from);
 550                                 alert_mail_from = t;
 551                         }
 552                 }
 553         }
 554 }
 555
 556 static char *alert_program = NULL;
 557 void programline(char *line)
 558 {
 559         char *w;
 560
 561         for (w = dl_next(line); w != line; w = dl_next(w))
 562                 if (alert_program == NULL)
 563                         alert_program = xstrdup(w);
 564 }
 565
 566 static char *home_host = NULL;
 567 static int require_homehost = 1;
 568 void homehostline(char *line)
 569 {
 570         char *w;
 571
 572         for (w = dl_next(line); w != line; w = dl_next(w)) {
 573                 if (is_devname_ignore(w) == true)
 574                         require_homehost = 0;
 575                 else if (home_host == NULL) {
 576                         if (strcasecmp(w, "<none>") == 0)
 577                                 home_host = xstrdup("");
 578                         else
 579                                 home_host = xstrdup(w);
 580                 }
 581         }
 582 }
 583
 584 static char *home_cluster = NULL;
 585 void homeclusterline(char *line)
 586 {
 587         char *w;
 588
 589         for (w = dl_next(line); w != line; w = dl_next(w)) {
 590                 if (home_cluster == NULL) {
 591                         if (strcasecmp(w, "<none>") == 0)
 592                                 home_cluster = xstrdup("");
 593                         else
 594                                 home_cluster = xstrdup(w);
 595                 }
 596         }
 597 }
 598
 599 static int monitor_delay;
 600 void monitordelayline(char *line)
 601 {
 602         char *w;
 603
 604         for (w = dl_next(line); w != line; w = dl_next(w)) {
 605                 if (monitor_delay == 0)
 606                         monitor_delay = strtol(w, NULL, 10);
 607         }
 608 }
 609
 610 char auto_yes[] = "yes";
 611 char auto_no[] = "no";
 612 char auto_homehost[] = "homehost";
 613
 614 static int auto_seen = 0;
 615 void autoline(char *line)
 616 {
 617         char *w;
 618         char *seen;
 619         int super_cnt;
 620         char *dflt = auto_yes;
 621         int homehost = 0;
 622         int i;
 623
 624         if (auto_seen)
 625                 return;
 626         auto_seen = 1;
 627
 628         /*
 629          * Parse the 'auto' line creating policy statements for the 'auto'
 630          * policy.
 631          *
 632          * The default is 'yes' but the 'auto' line might over-ride that.
 633          * Words in the line are processed in order with the first
 634          * match winning.
 635          * word can be:
 636          *   +version   - that version can be assembled
 637          *   -version   - that version cannot be auto-assembled
 638          *   yes or +all - any other version can be assembled
 639          *   no or -all  - no other version can be assembled.
 640          *   homehost   - any array associated by 'homehost' to this
 641          *                host can be assembled.
 642          *
 643          * Thus:
 644          *   +ddf -0.90 homehost -all
 645          * will auto-assemble any ddf array, no 0.90 array, and
 646          * any other array (imsm, 1.x) if and only if it is identified
 647          * as belonging to this host.
 648          *
 649          * We translate that to policy by creating 'auto=yes' when we see
 650          * a '+version' line, 'auto=no' if we see '-version' before 'homehost',
 651          * or 'auto=homehost' if we see '-version' after 'homehost'.
 652          * When we see yes, no, +all or -all we stop and any version that hasn't
 653          * been seen gets an appropriate auto= entry.
 654          */
 655
 656         /*
 657          * If environment variable MDADM_CONF_AUTO is defined, then
 658          * it is prepended to the auto line.  This allow a script
 659          * to easily disable some metadata types.
 660          */
 661         w = getenv("MDADM_CONF_AUTO");
 662         if (w && *w) {
 663                 char *l = xstrdup(w);
 664                 char *head = line;
 665                 w = strtok(l, " \t");
 666                 while (w) {
 667                         char *nw = dl_strdup(w);
 668                         dl_insert(head, nw);
 669                         head = nw;
 670                         w = strtok(NULL, " \t");
 671                 }
 672                 free(l);
 673         }
 674
 675         for (super_cnt = 0; superlist[super_cnt]; super_cnt++)
 676                 ;
 677         seen = xcalloc(super_cnt, 1);
 678
 679         for (w = dl_next(line); w != line; w = dl_next(w)) {
 680                 char *val;
 681
 682                 if (strcasecmp(w, "yes") == 0) {
 683                         dflt = auto_yes;
 684                         break;
 685                 }
 686                 if (strcasecmp(w, "no") == 0) {
 687                         if (homehost)
 688                                 dflt = auto_homehost;
 689                         else
 690                                 dflt = auto_no;
 691                         break;
 692                 }
 693                 if (strcasecmp(w, "homehost") == 0) {
 694                         homehost = 1;
 695                         continue;
 696                 }
 697                 if (w[0] == '+')
 698                         val = auto_yes;
 699                 else if (w[0] == '-') {
 700                         if (homehost)
 701                                 val = auto_homehost;
 702                         else
 703                                 val = auto_no;
 704                 } else
 705                         continue;
 706
 707                 if (strcasecmp(w + 1, "all") == 0) {
 708                         dflt = val;
 709                         break;
 710                 }
 711                 for (i = 0; superlist[i]; i++) {
 712                         const char *version = superlist[i]->name;
 713                         if (strcasecmp(w + 1, version) == 0)
 714                                 break;
 715                         /* 1 matches 1.x, 0 matches 0.90 */
 716                         if (version[1] == '.' && strlen(w + 1) == 1 &&
 717                             w[1] == version[0])
 718                                 break;
 719                         /* 1.anything matches 1.x */
 720                         if (strcmp(version, "1.x") == 0 &&
 721                             strncmp(w + 1, "1.", 2) == 0)
 722                                 break;
 723                 }
 724                 if (superlist[i] == NULL)
 725                         /* ignore this word */
 726                         continue;
 727                 if (seen[i])
 728                         /* already know about this metadata */
 729                         continue;
 730                 policy_add(rule_policy, pol_auto, val, pol_metadata,
 731                            superlist[i]->name, NULL);
 732                 seen[i] = 1;
 733         }
 734         for (i = 0; i < super_cnt; i++)
 735                 if (!seen[i])
 736                         policy_add(rule_policy, pol_auto, dflt, pol_metadata,
 737                                    superlist[i]->name, NULL);
 738
 739         free(seen);
 740 }
 741
 742 int loaded = 0;
 743
 744 static char *conffile = NULL;
 745 void set_conffile(char *file)
 746 {
 747         conffile = file;
 748 }
 749
 750 void conf_file(FILE *f)
 751 {
 752         char *line;
 753         while ((line = conf_line(f))) {
 754                 switch(match_keyword(line)) {
 755                 case Devices:
 756                         devline(line);
 757                         break;
 758                 case Array:
 759                         arrayline(line);
 760                         break;
 761                 case Mailaddr:
 762                         mailline(line);
 763                         break;
 764                 case Mailfrom:
 765                         mailfromline(line);
 766                         break;
 767                 case Program:
 768                         programline(line);
 769                         break;
 770                 case CreateDev:
 771                         createline(line);
 772                         break;
 773                 case Homehost:
 774                         homehostline(line);
 775                         break;
 776                 case HomeCluster:
 777                         homeclusterline(line);
 778                         break;
 779                 case AutoMode:
 780                         autoline(line);
 781                         break;
 782                 case Policy:
 783                         policyline(line, rule_policy);
 784                         break;
 785                 case PartPolicy:
 786                         policyline(line, rule_part);
 787                         break;
 788                 case Sysfs:
 789                         sysfsline(line);
 790                         break;
 791                 case MonitorDelay:
 792                         monitordelayline(line);
 793                         break;
 794                 default:
 795                         pr_err("Unknown keyword %s\n", line);
 796                 }
 797                 free_line(line);
 798         }
 799 }
 800
 801 struct fname {
 802         struct fname *next;
 803         char name[];
 804 };
 805
 806 void conf_file_or_dir(FILE *f)
 807 {
 808         struct stat st;
 809         DIR *dir;
 810         struct dirent *dp;
 811         struct fname *list = NULL;
 812
 813         fstat(fileno(f), &st);
 814         if (S_ISREG(st.st_mode))
 815                 conf_file(f);
 816         else if (!S_ISDIR(st.st_mode))
 817                 return;
 818 #if _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
 819         dir = fdopendir(fileno(f));
 820         if (!dir)
 821                 return;
 822         while ((dp = readdir(dir)) != NULL) {
 823                 int l;
 824                 struct fname *fn, **p;
 825                 if (dp->d_ino == 0)
 826                         continue;
 827                 if (dp->d_name[0] == '.')
 828                         continue;
 829                 l = strlen(dp->d_name);
 830                 if (l < 6 || strcmp(dp->d_name + l - 5, ".conf") != 0)
 831                         continue;
 832                 fn = xmalloc(sizeof(*fn) + l + 1);
 833                 strcpy(fn->name, dp->d_name);
 834                 for (p = &list;
 835                      *p && strcmp((*p)->name, fn->name) < 0;
 836                      p = & (*p)->next)
 837                         ;
 838                 fn->next = *p;
 839                 *p = fn;
 840         }
 841         while (list) {
 842                 int fd;
 843                 FILE *f2;
 844                 struct fname *fn = list;
 845                 list = list->next;
 846                 fd = openat(fileno(f), fn->name, O_RDONLY);
 847                 free(fn);
 848                 if (fd < 0)
 849                         continue;
 850                 f2 = fdopen(fd, "r");
 851                 if (!f2) {
 852                         close(fd);
 853                         continue;
 854                 }
 855                 conf_file(f2);
 856                 fclose(f2);
 857         }
 858         closedir(dir);
 859 #endif
 860 }
 861
 862 void load_conffile(void)
 863 {
 864         FILE *f;
 865         char *confdir = NULL;
 866         char *head;
 867
 868         if (loaded)
 869                 return;
 870         if (conffile == NULL) {
 871                 conffile = DefaultConfFile;
 872                 confdir = DefaultConfDir;
 873         }
 874
 875         if (strcmp(conffile, "partitions") == 0) {
 876                 char *list = dl_strdup("DEV");
 877                 dl_init(list);
 878                 dl_add(list, dl_strdup("partitions"));
 879                 devline(list);
 880                 free_line(list);
 881         } else if (strcmp(conffile, "none") != 0) {
 882                 f = fopen(conffile, "r");
 883                 /* Debian chose to relocate mdadm.conf into /etc/mdadm/.
 884                  * To allow Debian users to compile from clean source and still
 885                  * have a working mdadm, we read /etc/mdadm/mdadm.conf
 886                  * if /etc/mdadm.conf doesn't exist
 887                  */
 888                 if (f == NULL && conffile == DefaultConfFile) {
 889                         f = fopen(DefaultAltConfFile, "r");
 890                         if (f) {
 891                                 conffile = DefaultAltConfFile;
 892                                 confdir = DefaultAltConfDir;
 893                         }
 894                 }
 895                 if (f) {
 896                         conf_file_or_dir(f);
 897                         fclose(f);
 898                 }
 899                 if (confdir) {
 900                         f = fopen(confdir, "r");
 901                         if (f) {
 902                                 conf_file_or_dir(f);
 903                                 fclose(f);
 904                         }
 905                 }
 906         }
 907         /* If there was no AUTO line, process an empty line
 908          * now so that the MDADM_CONF_AUTO env var gets processed.
 909          */
 910         head = dl_strdup("AUTO");
 911         dl_init(head);
 912         autoline(head);
 913         free_line(head);
 914
 915         loaded = 1;
 916 }
 917
 918 char *conf_get_mailaddr(void)
 919 {
 920         load_conffile();
 921         return alert_email;
 922 }
 923
 924 char *conf_get_mailfrom(void)
 925 {
 926         load_conffile();
 927         return alert_mail_from;
 928 }
 929
 930 char *conf_get_program(void)
 931 {
 932         load_conffile();
 933         return alert_program;
 934 }
 935
 936 char *conf_get_homehost(int *require_homehostp)
 937 {
 938         load_conffile();
 939         if (require_homehostp)
 940                 *require_homehostp = require_homehost;
 941         return home_host;
 942 }
 943
 944 char *conf_get_homecluster(void)
 945 {
 946         load_conffile();
 947         return home_cluster;
 948 }
 949
 950 int conf_get_monitor_delay(void)
 951 {
 952         load_conffile();
 953         return monitor_delay;
 954 }
 955
 956 struct createinfo *conf_get_create_info(void)
 957 {
 958         load_conffile();
 959         return &createinfo;
 960 }
 961
 962 struct mddev_ident *conf_get_ident(char *dev)
 963 {
 964         struct mddev_ident *rv;
 965         load_conffile();
 966         rv = mddevlist;
 967         while (dev && rv && (rv->devname == NULL ||
 968                              !devname_matches(dev, rv->devname)))
 969                 rv = rv->next;
 970         return rv;
 971 }
 972
 973 static void append_dlist(struct mddev_dev **dlp, struct mddev_dev *list)
 974 {
 975         while (*dlp)
 976                 dlp = &(*dlp)->next;
 977         *dlp = list;
 978 }
 979
 980 struct mddev_dev *conf_get_devs()
 981 {
 982         glob_t globbuf;
 983         struct conf_dev *cd;
 984         int flags = 0;
 985         static struct mddev_dev *dlist = NULL;
 986         unsigned int i;
 987
 988         while (dlist) {
 989                 struct mddev_dev *t = dlist;
 990                 dlist = dlist->next;
 991                 free(t->devname);
 992                 free(t);
 993         }
 994
 995         load_conffile();
 996
 997         if (cdevlist == NULL) {
 998                 /* default to 'partitions' and 'containers' */
 999                 dlist = load_partitions();
1000                 append_dlist(&dlist, load_containers());
1001         }
1002
1003         for (cd = cdevlist; cd; cd = cd->next) {
1004                 if (strcasecmp(cd->name, "partitions") == 0)
1005                         append_dlist(&dlist, load_partitions());
1006                 else if (strcasecmp(cd->name, "containers") == 0)
1007                         append_dlist(&dlist, load_containers());
1008                 else {
1009                         glob(cd->name, flags, NULL, &globbuf);
1010                         flags |= GLOB_APPEND;
1011                 }
1012         }
1013         if (flags & GLOB_APPEND) {
1014                 for (i = 0; i < globbuf.gl_pathc; i++) {
1015                         struct mddev_dev *t;
1016                         t = xcalloc(1, sizeof(*t));
1017                         t->devname = xstrdup(globbuf.gl_pathv[i]);
1018                         t->next = dlist;
1019                         dlist = t;
1020 /*      printf("one dev is %s\n", t->devname);*/
1021                 }
1022                 globfree(&globbuf);
1023         }
1024
1025         return dlist;
1026 }
1027
1028 int conf_test_dev(char *devname)
1029 {
1030         struct conf_dev *cd;
1031         if (cdevlist == NULL)
1032                 /* allow anything by default */
1033                 return 1;
1034         for (cd = cdevlist; cd; cd = cd->next) {
1035                 if (strcasecmp(cd->name, "partitions") == 0)
1036                         return 1;
1037                 if (fnmatch(cd->name, devname, FNM_PATHNAME) == 0)
1038                         return 1;
1039         }
1040         return 0;
1041 }
1042
1043 int conf_test_metadata(const char *version, struct dev_policy *pol, int is_homehost)
1044 {
1045         /* If anyone said 'yes', that sticks.
1046          * else if homehost applies, use that
1047          * else if there is a 'no', say 'no'.
1048          * else 'yes'.
1049          */
1050         struct dev_policy *p;
1051         int no = 0, found_homehost = 0;
1052         load_conffile();
1053
1054         pol = pol_find(pol, pol_auto);
1055         pol_for_each(p, pol, version) {
1056                 if (strcmp(p->value, "yes") == 0)
1057                         return 1;
1058                 if (strcmp(p->value, "homehost") == 0)
1059                         found_homehost = 1;
1060                 if (strcmp(p->value, "no") == 0)
1061                         no = 1;
1062         }
1063         if (is_homehost && found_homehost)
1064                 return 1;
1065         if (no)
1066                 return 0;
1067         return 1;
1068 }
1069
1070 int match_oneof(char *devices, char *devname)
1071 {
1072         /* check if one of the comma separated patterns in devices
1073          * matches devname
1074          */
1075
1076         while (devices && *devices) {
1077                 char patn[1024];
1078                 char *p = devices;
1079                 devices = strchr(devices, ',');
1080                 if (!devices)
1081                         devices = p + strlen(p);
1082                 if (devices-p < 1024) {
1083                         strncpy(patn, p, devices - p);
1084                         patn[devices-p] = 0;
1085                         if (fnmatch(patn, devname, FNM_PATHNAME) == 0)
1086                                 return 1;
1087                 }
1088                 if (*devices == ',')
1089                         devices++;
1090         }
1091         return 0;
1092 }
1093
1094 int devname_matches(char *name, char *match)
1095 {
1096         /* See if the given array name matches the
1097          * given match from config file.
1098          *
1099          * First strip and /dev/md/ or /dev/, then
1100          * see if there might be a numeric match of
1101          *  mdNN with NN
1102          * then just strcmp
1103          */
1104         if (strncmp(name, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0)
1105                 name += DEV_MD_DIR_LEN;
1106         else if (strncmp(name, "/dev/", 5) == 0)
1107                 name += 5;
1108
1109         if (strncmp(match, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0)
1110                 match += DEV_MD_DIR_LEN;
1111         else if (strncmp(match, "/dev/", 5) == 0)
1112                 match += 5;
1113
1114         if (strncmp(name, "md", 2) == 0 && isdigit(name[2]))
1115                 name += 2;
1116         if (strncmp(match, "md", 2) == 0 && isdigit(match[2]))
1117                 match += 2;
1118
1119         return (strcmp(name, match) == 0);
1120 }
1121
1122 int conf_name_is_free(char *name)
1123 {
1124         /* Check if this name is already taken by an ARRAY entry in
1125          * the config file.
1126          * It can be taken either by a match on devname, name, or
1127          * even super-minor.
1128          */
1129         struct mddev_ident *dev;
1130
1131         load_conffile();
1132         for (dev = mddevlist; dev; dev = dev->next) {
1133                 char nbuf[100];
1134                 if (dev->devname && devname_matches(name, dev->devname))
1135                         return 0;
1136                 if (dev->name[0] && devname_matches(name, dev->name))
1137                         return 0;
1138                 sprintf(nbuf, "%d", dev->super_minor);
1139                 if (dev->super_minor != UnSet && devname_matches(name, nbuf))
1140                         return 0;
1141         }
1142         return 1;
1143 }
1144
1145 struct mddev_ident *conf_match(struct supertype *st,
1146                                struct mdinfo *info,
1147                                char *devname,
1148                                int verbose, int *rvp)
1149 {
1150         struct mddev_ident *array_list, *match;
1151         array_list = conf_get_ident(NULL);
1152         match = NULL;
1153         for (; array_list; array_list = array_list->next) {
1154                 if (array_list->uuid_set &&
1155                     same_uuid(array_list->uuid, info->uuid,
1156                               st->ss->swapuuid) == 0) {
1157                         if (verbose >= 2 && array_list->devname)
1158                                 pr_err("UUID differs from %s.\n",
1159                                        array_list->devname);
1160                         continue;
1161                 }
1162                 if (array_list->name[0] &&
1163                     strcasecmp(array_list->name, info->name) != 0) {
1164                         if (verbose >= 2 && array_list->devname)
1165                                 pr_err("Name differs from %s.\n",
1166                                        array_list->devname);
1167                         continue;
1168                 }
1169                 if (array_list->devices && devname &&
1170                     !match_oneof(array_list->devices, devname)) {
1171                         if (verbose >= 2 && array_list->devname)
1172                                 pr_err("Not a listed device for %s.\n",
1173                                        array_list->devname);
1174                         continue;
1175                 }
1176                 if (array_list->super_minor != UnSet &&
1177                     array_list->super_minor != info->array.md_minor) {
1178                         if (verbose >= 2 && array_list->devname)
1179                                 pr_err("Different super-minor to %s.\n",
1180                                        array_list->devname);
1181                         continue;
1182                 }
1183                 if (!array_list->uuid_set && !array_list->name[0] &&
1184                     !array_list->devices && array_list->super_minor == UnSet) {
1185                         if (verbose >= 2 && array_list->devname)
1186                                 pr_err("%s doesn't have any identifying information.\n",
1187                                        array_list->devname);
1188                         continue;
1189                 }
1190                 /* FIXME, should I check raid_disks and level too?? */
1191
1192                 if (match) {
1193                         if (verbose >= 0) {
1194                                 if (match->devname && array_list->devname)
1195                                         pr_err("we match both %s and %s - cannot decide which to use.\n",
1196                                                match->devname,
1197                                                array_list->devname);
1198                                 else
1199                                         pr_err("multiple lines in mdadm.conf match\n");
1200                         }
1201                         if (rvp)
1202                                 *rvp = 2;
1203                         match = NULL;
1204                         break;
1205                 }
1206                 match = array_list;
1207         }
1208         return match;
1209 }
1210
1211 int conf_verify_devnames(struct mddev_ident *array_list)
1212 {
1213         struct mddev_ident *a1, *a2;
1214
1215         for (a1 = array_list; a1; a1 = a1->next) {
1216                 if (!a1->devname)
1217                         continue;
1218                 if (strcmp(a1->devname, "<ignore>") == 0)
1219                         continue;
1220                 for (a2 = a1->next; a2; a2 = a2->next) {
1221                         if (!a2->devname)
1222                                 continue;
1223                         if (strcmp(a1->devname, a2->devname) != 0)
1224                                 continue;
1225
1226                         if (a1->uuid_set && a2->uuid_set) {
1227                                 char nbuf[64];
1228                                 __fname_from_uuid(a1->uuid, 0, nbuf, ':');
1229                                 pr_err("Devices %s and ",
1230                                        nbuf);
1231                                 __fname_from_uuid(a2->uuid, 0, nbuf, ':');
1232                                 fprintf(stderr,
1233                                         "%s have the same name: %s\n",
1234                                         nbuf, a1->devname);
1235                         } else
1236                                 pr_err("Device %s given twice in config file\n", a1->devname);
1237                         return 1;
1238                 }
1239         }
1240
1241         return 0;
1242 }