lib/mountlist.c

   1 /* mountlist.c -- return a list of mounted filesystems
   2    Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #include <stdio.h>
  23 #include <sys/types.h>
  24 #include "mountlist.h"
  25
  26 #ifdef STDC_HEADERS
  27 # include <stdlib.h>
  28 #else
  29 void free ();
  30 #endif
  31 #if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
  32 # include <string.h>
  33 #else
  34 # include <strings.h>
  35 #endif
  36
  37 char *strstr ();
  38 char *xmalloc ();
  39 char *xrealloc ();
  40 char *xstrdup ();
  41 void error ();
  42
  43 #ifdef HAVE_SYS_PARAM_H
  44 # include <sys/param.h>
  45 #endif
  46
  47 #if defined (MOUNTED_GETFSSTAT) /* __alpha running OSF_1 */
  48 # include <sys/mount.h>
  49 # include <sys/fs_types.h>
  50 #endif /* MOUNTED_GETFSSTAT */
  51
  52 #ifdef MOUNTED_GETMNTENT1       /* 4.3BSD, SunOS, HP-UX, Dynix, Irix.  */
  53 # include <mntent.h>
  54 # if !defined(MOUNTED)
  55 #  if defined(MNT_MNTTAB)       /* HP-UX.  */
  56 #   define MOUNTED MNT_MNTTAB
  57 #  endif
  58 #  if defined(MNTTABNAME)       /* Dynix.  */
  59 #   define MOUNTED MNTTABNAME
  60 #  endif
  61 # endif
  62 #endif
  63
  64 #ifdef MOUNTED_GETMNTINFO       /* 4.4BSD.  */
  65 # include <sys/mount.h>
  66 #endif
  67
  68 #ifdef MOUNTED_GETMNT           /* Ultrix.  */
  69 # include <sys/mount.h>
  70 # include <sys/fs_types.h>
  71 #endif
  72
  73 #ifdef MOUNTED_FREAD            /* SVR2.  */
  74 # include <mnttab.h>
  75 #endif
  76
  77 #ifdef MOUNTED_FREAD_FSTYP      /* SVR3.  */
  78 # include <mnttab.h>
  79 # include <sys/fstyp.h>
  80 # include <sys/statfs.h>
  81 #endif
  82
  83 #ifdef MOUNTED_LISTMNTENT
  84 # include <mntent.h>
  85 #endif
  86
  87 #ifdef MOUNTED_GETMNTENT2       /* SVR4.  */
  88 # include <sys/mnttab.h>
  89 #endif
  90
  91 #ifdef MOUNTED_VMOUNT           /* AIX.  */
  92 # include <fshelp.h>
  93 # include <sys/vfs.h>
  94 #endif
  95
  96 #ifdef DOLPHIN
  97 /* So special that it's not worth putting this in autoconf.  */
  98 # undef MOUNTED_FREAD_FSTYP
  99 # define MOUNTED_GETMNTTBL
 100 #endif
 101
 102 #ifdef HAVE_SYS_MNTENT_H
 103 /* This is to get MNTOPT_IGNORE on e.g. SVR4.  */
 104 # include <sys/mntent.h>
 105 #endif
 106
 107 #if defined (MNTOPT_IGNORE) && defined (HAVE_HASMNTOPT)
 108 # define MNT_IGNORE(M) hasmntopt ((M), MNTOPT_IGNORE)
 109 #else
 110 # define MNT_IGNORE(M) 0
 111 #endif
 112
 113 #ifdef MOUNTED_GETMNTENT1       /* 4.3BSD, SunOS, HP-UX, Dynix, Irix.  */
 114 /* Return the value of the hexadecimal number represented by CP.
 115    No prefix (like '0x') or suffix (like 'h') is expected to be
 116    part of CP. */
 117
 118 static int
 119 xatoi (cp)
 120      char *cp;
 121 {
 122   int val;
 123
 124   val = 0;
 125   while (*cp)
 126     {
 127       if (*cp >= 'a' && *cp <= 'f')
 128         val = val * 16 + *cp - 'a' + 10;
 129       else if (*cp >= 'A' && *cp <= 'F')
 130         val = val * 16 + *cp - 'A' + 10;
 131       else if (*cp >= '0' && *cp <= '9')
 132         val = val * 16 + *cp - '0';
 133       else
 134         break;
 135       cp++;
 136     }
 137   return val;
 138 }
 139 #endif /* MOUNTED_GETMNTENT1.  */
 140
 141 #if defined (MOUNTED_GETMNTINFO) && !defined (__NetBSD__) && !defined (__OpenBSD__)
 142 static char *
 143 fstype_to_string (t)
 144      short t;
 145 {
 146   switch (t)
 147     {
 148 # ifdef MOUNT_PC
 149     case MOUNT_PC:
 150       return "pc";
 151 # endif
 152 # ifdef MOUNT_MFS
 153     case MOUNT_MFS:
 154       return "mfs";
 155 # endif
 156 # ifdef MOUNT_LO
 157     case MOUNT_LO:
 158       return "lo";
 159 # endif
 160 # ifdef MOUNT_TFS
 161     case MOUNT_TFS:
 162       return "tfs";
 163 # endif
 164 # ifdef MOUNT_TMP
 165     case MOUNT_TMP:
 166       return "tmp";
 167 # endif
 168 # ifdef MOUNT_UFS
 169    case MOUNT_UFS:
 170      return "ufs" ;
 171 # endif
 172 # ifdef MOUNT_NFS
 173    case MOUNT_NFS:
 174      return "nfs" ;
 175 # endif
 176 # ifdef MOUNT_MSDOS
 177    case MOUNT_MSDOS:
 178      return "msdos" ;
 179 # endif
 180 # ifdef MOUNT_LFS
 181    case MOUNT_LFS:
 182      return "lfs" ;
 183 # endif
 184 # ifdef MOUNT_LOFS
 185    case MOUNT_LOFS:
 186      return "lofs" ;
 187 # endif
 188 # ifdef MOUNT_FDESC
 189    case MOUNT_FDESC:
 190      return "fdesc" ;
 191 # endif
 192 # ifdef MOUNT_PORTAL
 193    case MOUNT_PORTAL:
 194      return "portal" ;
 195 # endif
 196 # ifdef MOUNT_NULL
 197    case MOUNT_NULL:
 198      return "null" ;
 199 # endif
 200 # ifdef MOUNT_UMAP
 201    case MOUNT_UMAP:
 202      return "umap" ;
 203 # endif
 204 # ifdef MOUNT_KERNFS
 205    case MOUNT_KERNFS:
 206      return "kernfs" ;
 207 # endif
 208 # ifdef MOUNT_PROCFS
 209    case MOUNT_PROCFS:
 210      return "procfs" ;
 211 # endif
 212 # ifdef MOUNT_AFS
 213    case MOUNT_AFS:
 214      return "afs" ;
 215 # endif
 216 # ifdef MOUNT_CD9660
 217    case MOUNT_CD9660:
 218      return "cd9660" ;
 219 # endif
 220 # ifdef MOUNT_UNION
 221    case MOUNT_UNION:
 222      return "union" ;
 223 # endif
 224 # ifdef MOUNT_DEVFS
 225    case MOUNT_DEVFS:
 226      return "devfs" ;
 227 # endif
 228 # ifdef MOUNT_EXT2FS
 229    case MOUNT_EXT2FS:
 230      return "ext2fs" ;
 231 # endif
 232     default:
 233       return "?";
 234     }
 235 }
 236 #endif /* MOUNTED_GETMNTINFO */
 237
 238 #ifdef MOUNTED_VMOUNT           /* AIX.  */
 239 static char *
 240 fstype_to_string (t)
 241      int t;
 242 {
 243   struct vfs_ent *e;
 244
 245   e = getvfsbytype (t);
 246   if (!e || !e->vfsent_name)
 247     return "none";
 248   else
 249     return e->vfsent_name;
 250 }
 251 #endif /* MOUNTED_VMOUNT */
 252
 253 /* Return a list of the currently mounted filesystems, or NULL on error.
 254    Add each entry to the tail of the list so that they stay in order.
 255    If NEED_FS_TYPE is nonzero, ensure that the filesystem type fields in
 256    the returned list are valid.  Otherwise, they might not be.
 257    If ALL_FS is zero, do not return entries for filesystems that
 258    are automounter (dummy) entries.  */
 259
 260 struct mount_entry *
 261 read_filesystem_list (need_fs_type, all_fs)
 262      int need_fs_type, all_fs;
 263 {
 264   struct mount_entry *mount_list;
 265   struct mount_entry *me;
 266   struct mount_entry *mtail;
 267
 268   /* Start the list off with a dummy entry. */
 269   me = (struct mount_entry *) xmalloc (sizeof (struct mount_entry));
 270   me->me_next = NULL;
 271   mount_list = mtail = me;
 272
 273 #ifdef MOUNTED_LISTMNTENT
 274   {
 275     struct tabmntent *mntlist, *p;
 276     struct mntent *mnt;
 277     struct mount_entry *me;
 278
 279     /* the third and fourth arguments could be used to filter mounts,
 280        but Crays doesn't seem to have any mounts that we want to
 281        remove. Specifically, automount create normal NFS mounts.
 282        */
 283
 284     if(listmntent(&mntlist, KMTAB, NULL, NULL) < 0)
 285       return NULL;
 286     p = mntlist;
 287     while(p){
 288       mnt = p->ment;
 289       me = (struct mount_entry*) xmalloc(sizeof (struct mount_entry));
 290       me->me_devname = xstrdup(mnt->mnt_fsname);
 291       me->me_mountdir = xstrdup(mnt->mnt_dir);
 292       me->me_type = xstrdup(mnt->mnt_type);
 293       me->me_dev = -1;
 294       me->me_next = NULL;
 295       mtail->me_next = me;
 296       mtail = me;
 297       p = p->next;
 298     }
 299     freemntlist(mntlist);
 300   }
 301 #endif
 302
 303 #ifdef MOUNTED_GETMNTENT1       /* 4.3BSD, SunOS, HP-UX, Dynix, Irix.  */
 304   {
 305     struct mntent *mnt;
 306     char *table = MOUNTED;
 307     FILE *fp;
 308     char *devopt;
 309
 310     fp = setmntent (table, "r");
 311     if (fp == NULL)
 312       return NULL;
 313
 314     while ((mnt = getmntent (fp)))
 315       {
 316         if (!all_fs && (!strcmp (mnt->mnt_type, "ignore")
 317                         || !strcmp (mnt->mnt_type, "auto")))
 318           continue;
 319
 320         me = (struct mount_entry *) xmalloc (sizeof (struct mount_entry));
 321         me->me_devname = xstrdup (mnt->mnt_fsname);
 322         me->me_mountdir = xstrdup (mnt->mnt_dir);
 323         me->me_type = xstrdup (mnt->mnt_type);
 324         devopt = strstr (mnt->mnt_opts, "dev=");
 325         if (devopt)
 326           {
 327             if (devopt[4] == '0' && (devopt[5] == 'x' || devopt[5] == 'X'))
 328               me->me_dev = xatoi (devopt + 6);
 329             else
 330               me->me_dev = xatoi (devopt + 4);
 331           }
 332         else
 333           me->me_dev = (dev_t) -1;      /* Magic; means not known yet. */
 334         me->me_next = NULL;
 335
 336         /* Add to the linked list. */
 337         mtail->me_next = me;
 338         mtail = me;
 339       }
 340
 341     if (endmntent (fp) == 0)
 342       return NULL;
 343   }
 344 #endif /* MOUNTED_GETMNTENT1. */
 345
 346 #ifdef MOUNTED_GETMNTINFO       /* 4.4BSD.  */
 347   {
 348     struct statfs *fsp;
 349     int entries;
 350
 351     entries = getmntinfo (&fsp, MNT_NOWAIT);
 352     if (entries < 0)
 353       return NULL;
 354     while (entries-- > 0)
 355       {
 356         me = (struct mount_entry *) xmalloc (sizeof (struct mount_entry));
 357         me->me_devname = xstrdup (fsp->f_mntfromname);
 358         me->me_mountdir = xstrdup (fsp->f_mntonname);
 359 # if defined (__NetBSD__) || defined (__OpenBSD__)
 360         me->me_type = xstrdup (fsp->f_fstypename);
 361 # else
 362         me->me_type = fstype_to_string (fsp->f_type);
 363 # endif
 364         me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */
 365         me->me_next = NULL;
 366
 367         /* Add to the linked list. */
 368         mtail->me_next = me;
 369         mtail = me;
 370         fsp++;
 371       }
 372   }
 373 #endif /* MOUNTED_GETMNTINFO */
 374
 375 #ifdef MOUNTED_GETMNT           /* Ultrix.  */
 376   {
 377     int offset = 0;
 378     int val;
 379     struct fs_data fsd;
 380
 381     while ((val = getmnt (&offset, &fsd, sizeof (fsd), NOSTAT_MANY,
 382                           (char *) 0)) > 0)
 383       {
 384         me = (struct mount_entry *) xmalloc (sizeof (struct mount_entry));
 385         me->me_devname = xstrdup (fsd.fd_req.devname);
 386         me->me_mountdir = xstrdup (fsd.fd_req.path);
 387         me->me_type = gt_names[fsd.fd_req.fstype];
 388         me->me_dev = fsd.fd_req.dev;
 389         me->me_next = NULL;
 390
 391         /* Add to the linked list. */
 392         mtail->me_next = me;
 393         mtail = me;
 394       }
 395     if (val < 0)
 396       return NULL;
 397   }
 398 #endif /* MOUNTED_GETMNT. */
 399
 400 #if defined (MOUNTED_GETFSSTAT) /* __alpha running OSF_1 */
 401   {
 402     int numsys, counter, bufsize;
 403     struct statfs *stats;
 404
 405     numsys = getfsstat ((struct statfs *)0, 0L, MNT_WAIT);
 406     if (numsys < 0)
 407       return (NULL);
 408
 409     bufsize = (1 + numsys) * sizeof (struct statfs);
 410     stats = (struct statfs *)xmalloc (bufsize);
 411     numsys = getfsstat (stats, bufsize, MNT_WAIT);
 412
 413     if (numsys < 0)
 414       {
 415         free (stats);
 416         return (NULL);
 417       }
 418
 419     for (counter = 0; counter < numsys; counter++)
 420       {
 421         me = (struct mount_entry *) xmalloc (sizeof (struct mount_entry));
 422         me->me_devname = xstrdup (stats[counter].f_mntfromname);
 423         me->me_mountdir = xstrdup (stats[counter].f_mntonname);
 424         me->me_type = mnt_names[stats[counter].f_type];
 425         me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */
 426         me->me_next = NULL;
 427
 428         /* Add to the linked list. */
 429         mtail->me_next = me;
 430         mtail = me;
 431       }
 432
 433     free (stats);
 434   }
 435 #endif /* MOUNTED_GETFSSTAT */
 436
 437 #if defined (MOUNTED_FREAD) || defined (MOUNTED_FREAD_FSTYP) /* SVR[23].  */
 438   {
 439     struct mnttab mnt;
 440     char *table = "/etc/mnttab";
 441     FILE *fp;
 442
 443     fp = fopen (table, "r");
 444     if (fp == NULL)
 445       return NULL;
 446
 447     while (fread (&mnt, sizeof mnt, 1, fp) > 0)
 448       {
 449         me = (struct mount_entry *) xmalloc (sizeof (struct mount_entry));
 450 # ifdef GETFSTYP                        /* SVR3.  */
 451         me->me_devname = xstrdup (mnt.mt_dev);
 452 # else
 453         me->me_devname = xmalloc (strlen (mnt.mt_dev) + 6);
 454         strcpy (me->me_devname, "/dev/");
 455         strcpy (me->me_devname + 5, mnt.mt_dev);
 456 # endif
 457         me->me_mountdir = xstrdup (mnt.mt_filsys);
 458         me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */
 459         me->me_type = "";
 460 # ifdef GETFSTYP                        /* SVR3.  */
 461         if (need_fs_type)
 462           {
 463             struct statfs fsd;
 464             char typebuf[FSTYPSZ];
 465
 466             if (statfs (me->me_mountdir, &fsd, sizeof fsd, 0) != -1
 467                 && sysfs (GETFSTYP, fsd.f_fstyp, typebuf) != -1)
 468               me->me_type = xstrdup (typebuf);
 469           }
 470 # endif
 471         me->me_next = NULL;
 472
 473         /* Add to the linked list. */
 474         mtail->me_next = me;
 475         mtail = me;
 476       }
 477
 478     if (fclose (fp) == EOF)
 479       return NULL;
 480   }
 481 #endif /* MOUNTED_FREAD || MOUNTED_FREAD_FSTYP.  */
 482
 483 #ifdef MOUNTED_GETMNTTBL        /* DolphinOS goes it's own way */
 484   {
 485     struct mntent **mnttbl=getmnttbl(),**ent;
 486     for (ent=mnttbl;*ent;ent++)
 487       {
 488         me = (struct mount_entry *) xmalloc (sizeof (struct mount_entry));
 489         me->me_devname = xstrdup ( (*ent)->mt_resource);
 490         me->me_mountdir = xstrdup( (*ent)->mt_directory);
 491         me->me_type =  xstrdup ((*ent)->mt_fstype);
 492         me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */
 493         me->me_next = NULL;
 494
 495         /* Add to the linked list. */
 496         mtail->me_next = me;
 497         mtail = me;
 498       }
 499     endmnttbl();
 500   }
 501 #endif
 502
 503 #ifdef MOUNTED_GETMNTENT2       /* SVR4.  */
 504   {
 505     struct mnttab mnt;
 506     char *table = MNTTAB;
 507     FILE *fp;
 508     int ret;
 509
 510     fp = fopen (table, "r");
 511     if (fp == NULL)
 512       return NULL;
 513
 514     while ((ret = getmntent (fp, &mnt)) == 0)
 515       {
 516         /* Don't show automounted filesystems twice on e.g., Solaris.  */
 517         if (!all_fs && MNT_IGNORE (&mnt))
 518           continue;
 519
 520         me = (struct mount_entry *) xmalloc (sizeof (struct mount_entry));
 521         me->me_devname = xstrdup (mnt.mnt_special);
 522         me->me_mountdir = xstrdup (mnt.mnt_mountp);
 523         me->me_type = xstrdup (mnt.mnt_fstype);
 524         me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */
 525         me->me_next = NULL;
 526
 527         /* Add to the linked list. */
 528         mtail->me_next = me;
 529         mtail = me;
 530       }
 531
 532     if (ret > 0)
 533       return NULL;
 534    if (fclose (fp) == EOF)
 535       return NULL;
 536   }
 537 #endif /* MOUNTED_GETMNTENT2.  */
 538
 539 #ifdef MOUNTED_VMOUNT           /* AIX.  */
 540   {
 541     int bufsize;
 542     char *entries, *thisent;
 543     struct vmount *vmp;
 544
 545     /* Ask how many bytes to allocate for the mounted filesystem info.  */
 546     mntctl (MCTL_QUERY, sizeof bufsize, (struct vmount *) &bufsize);
 547     entries = xmalloc (bufsize);
 548
 549     /* Get the list of mounted filesystems.  */
 550     mntctl (MCTL_QUERY, bufsize, (struct vmount *) entries);
 551
 552     for (thisent = entries; thisent < entries + bufsize;
 553          thisent += vmp->vmt_length)
 554       {
 555         vmp = (struct vmount *) thisent;
 556         me = (struct mount_entry *) xmalloc (sizeof (struct mount_entry));
 557         if (vmp->vmt_flags & MNT_REMOTE)
 558           {
 559             char *host, *path;
 560
 561             /* Prepend the remote pathname.  */
 562             host = thisent + vmp->vmt_data[VMT_HOSTNAME].vmt_off;
 563             path = thisent + vmp->vmt_data[VMT_OBJECT].vmt_off;
 564             me->me_devname = xmalloc (strlen (host) + strlen (path) + 2);
 565             strcpy (me->me_devname, host);
 566             strcat (me->me_devname, ":");
 567             strcat (me->me_devname, path);
 568           }
 569         else
 570           {
 571             me->me_devname = xstrdup (thisent +
 572                                       vmp->vmt_data[VMT_OBJECT].vmt_off);
 573           }
 574         me->me_mountdir = xstrdup (thisent + vmp->vmt_data[VMT_STUB].vmt_off);
 575         me->me_type = xstrdup (fstype_to_string (vmp->vmt_gfstype));
 576         me->me_dev = (dev_t) -1; /* vmt_fsid might be the info we want.  */
 577         me->me_next = NULL;
 578
 579         /* Add to the linked list. */
 580         mtail->me_next = me;
 581         mtail = me;
 582       }
 583     free (entries);
 584   }
 585 #endif /* MOUNTED_VMOUNT. */
 586
 587   /* Free the dummy head. */
 588   me = mount_list;
 589   mount_list = mount_list->me_next;
 590   free (me);
 591   return mount_list;
 592 }