source/smbd/quotas.c

   1 #ifdef QUOTAS
   2 /*
   3    Unix SMB/Netbios implementation.
   4    Version 1.9.
   5    support for quotas
   6    Copyright (C) Andrew Tridgell 1992-1997
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23
  24 /*
  25  * This is one of the most system dependent parts of Samba, and its
  26  * done a litle differently. Each system has its own way of doing
  27  * things :-(
  28  */
  29
  30 #include "includes.h"
  31
  32 extern int DEBUGLEVEL;
  33
  34 #ifdef LINUX
  35
  36 #include <sys/types.h>
  37 #include <asm/types.h>
  38 #include <sys/quota.h>
  39
  40 #include <mntent.h>
  41 #include <linux/unistd.h>
  42
  43 _syscall4(int, quotactl, int, cmd, const char *, special, int, id, caddr_t, addr);
  44
  45 /****************************************************************************
  46 try to get the disk space from disk quotas (LINUX version)
  47 ****************************************************************************/
  48
  49 BOOL disk_quotas(char *path, int *bsize, int *dfree, int *dsize)
  50 {
  51   uid_t euser_id;
  52   int r;
  53   char dev_disk[256];
  54   struct dqblk D;
  55   struct stat S;
  56   FILE *fp;
  57   struct mntent *mnt;
  58   int devno;
  59   int found;
  60
  61   /* find the block device file */
  62
  63   if ( stat(path, &S) == -1 ) {
  64     return(False) ;
  65   }
  66
  67   devno = S.st_dev ;
  68
  69   fp = setmntent(MOUNTED,"r");
  70   found = False ;
  71
  72   while ((mnt = getmntent(fp))) {
  73     if ( stat(mnt->mnt_dir,&S) == -1 )
  74       continue ;
  75     if (S.st_dev == devno) {
  76       found = True ;
  77       break ;
  78     }
  79   }
  80   endmntent(fp) ;
  81
  82   if (!found) {
  83       return(False);
  84     }
  85
  86   euser_id=geteuid();
  87   seteuid(0);
  88   r=quotactl(QCMD(Q_GETQUOTA,USRQUOTA), mnt->mnt_fsname, euser_id, (caddr_t)&D);
  89       seteuid(euser_id);
  90
  91   /* Use softlimit to determine disk space, except when it has been exceeded */
  92   *bsize = 1024;
  93   if (r)
  94     {
  95       if (errno == EDQUOT)
  96        {
  97          *dfree =0;
  98          *dsize =D.dqb_curblocks;
  99          return (True);
 100     }
 101       else return(False);
 102   }
 103   /* Use softlimit to determine disk space, except when it has been exceeded */
 104   if (
 105       (D.dqb_bsoftlimit && D.dqb_curblocks>=D.dqb_bsoftlimit) ||
 106       (D.dqb_bhardlimit && D.dqb_curblocks>=D.dqb_bhardlimit) ||
 107       (D.dqb_isoftlimit && D.dqb_curinodes>=D.dqb_isoftlimit) ||
 108       (D.dqb_ihardlimit && D.dqb_curinodes>=D.dqb_ihardlimit)
 109      )
 110     {
 111       *dfree = 0;
 112       *dsize = D.dqb_curblocks;
 113     }
 114   else if (D.dqb_bsoftlimit==0 && D.dqb_bhardlimit==0)
 115     {
 116       return(False);
 117     }
 118   else {
 119     *dfree = D.dqb_bsoftlimit - D.dqb_curblocks;
 120     *dsize = D.dqb_bsoftlimit;
 121   }
 122   return (True);
 123 }
 124
 125 #elif defined(CRAY)
 126
 127 #include <sys/quota.h>
 128 #include <mntent.h>
 129
 130 /****************************************************************************
 131 try to get the disk space from disk quotas (CRAY VERSION)
 132 ****************************************************************************/
 133 BOOL disk_quotas(char *path, int *bsize, int *dfree, int *dsize)
 134 {
 135   struct mntent *mnt;
 136   FILE *fd;
 137   struct stat sbuf;
 138   dev_t devno ;
 139   static dev_t devno_cached = 0 ;
 140   static char name[MNTMAXSTR] ;
 141   struct q_request request ;
 142   struct qf_header header ;
 143   static int quota_default = 0 ;
 144   int found ;
 145
 146   if ( stat(path,&sbuf) == -1 )
 147     return(False) ;
 148
 149   devno = sbuf.st_dev ;
 150
 151   if ( devno != devno_cached ) {
 152
 153     devno_cached = devno ;
 154
 155     if ((fd = setmntent(KMTAB)) == NULL)
 156       return(False) ;
 157
 158     found = False ;
 159
 160     while ((mnt = getmntent(fd)) != NULL) {
 161
 162       if ( stat(mnt->mnt_dir,&sbuf) == -1 )
 163         continue ;
 164
 165       if (sbuf.st_dev == devno) {
 166
 167         found = True ;
 168         break ;
 169
 170       }
 171
 172     }
 173
 174     strcpy(name,mnt->mnt_dir) ;
 175     endmntent(fd) ;
 176
 177     if ( ! found )
 178       return(False) ;
 179   }
 180
 181   request.qf_magic = QF_MAGIC ;
 182   request.qf_entry.id = geteuid() ;
 183
 184   if (quotactl(name, Q_GETQUOTA, &request) == -1)
 185     return(False) ;
 186
 187   if ( ! request.user )
 188     return(False) ;
 189
 190   if ( request.qf_entry.user_q.f_quota == QFV_DEFAULT ) {
 191
 192     if ( ! quota_default ) {
 193
 194       if ( quotactl(name, Q_GETHEADER, &header) == -1 )
 195         return(False) ;
 196       else
 197         quota_default = header.user_h.def_fq ;
 198     }
 199
 200     *dfree = quota_default ;
 201
 202   }else if ( request.qf_entry.user_q.f_quota == QFV_PREVENT ) {
 203
 204     *dfree = 0 ;
 205
 206   }else{
 207
 208     *dfree = request.qf_entry.user_q.f_quota ;
 209
 210   }
 211
 212   *dsize = request.qf_entry.user_q.f_use ;
 213
 214   if ( *dfree )
 215     *dfree -= *dsize ;
 216
 217   if ( *dfree < 0 )
 218     *dfree = 0 ;
 219
 220   *bsize = 4096 ;  /* Cray blocksize */
 221
 222   return(True) ;
 223
 224 }
 225
 226
 227 #elif defined(SUNOS5) || defined(SUNOS4)
 228
 229 #include <fcntl.h>
 230 #if defined(SUNOS5)
 231 #include <sys/fs/ufs_quota.h>
 232 #include <sys/mnttab.h>
 233 #else /* defined(SUNOS4) */
 234 #include <ufs/quota.h>
 235 #include <mntent.h>
 236 #endif
 237
 238 /****************************************************************************
 239 try to get the disk space from disk quotas (solaris 2 version)
 240 ****************************************************************************/
 241 /* Quota code by Peter Urbanec (amiga@cse.unsw.edu.au) */
 242 BOOL disk_quotas(char *path, int *bsize, int *dfree, int *dsize)
 243 {
 244   uid_t user_id, euser_id;
 245   int ret;
 246   struct dqblk D;
 247 #if defined(SUNOS5)
 248   struct quotctl command;
 249   int file;
 250   struct mnttab mnt;
 251   static char name[MNT_LINE_MAX] ;
 252 #else
 253   struct mntent *mnt;
 254   static char name[MNTMAXSTR] ;
 255 #endif
 256   FILE *fd;
 257   struct stat sbuf;
 258   dev_t devno ;
 259   static dev_t devno_cached = 0 ;
 260   int found ;
 261
 262   if ( stat(path,&sbuf) == -1 )
 263     return(False) ;
 264
 265   devno = sbuf.st_dev ;
 266   DEBUG(5,("disk_quotas: looking for path \"%s\" devno=%o\n", path,devno));
 267   if ( devno != devno_cached ) {
 268     devno_cached = devno ;
 269 #if defined(SUNOS5)
 270     if ((fd = fopen(MNTTAB, "r")) == NULL)
 271       return(False) ;
 272
 273     found = False ;
 274     while (getmntent(fd, &mnt) == 0) {
 275       if ( stat(mnt.mnt_mountp,&sbuf) == -1 )
 276         continue ;
 277       DEBUG(5,("disk_quotas: testing \"%s\" devno=%o\n",
 278                mnt.mnt_mountp,sbuf.st_dev));
 279       if (sbuf.st_dev == devno) {
 280         found = True ;
 281         break ;
 282       }
 283     }
 284
 285     strcpy(name,mnt.mnt_mountp) ;
 286     strcat(name,"/quotas") ;
 287     fclose(fd) ;
 288 #else
 289     if ((fd = setmntent(MOUNTED, "r")) == NULL)
 290       return(False) ;
 291
 292     found = False ;
 293     while ((mnt = getmntent(fd)) != NULL) {
 294       if ( stat(mnt->mnt_dir,&sbuf) == -1 )
 295         continue ;
 296       DEBUG(5,("disk_quotas: testing \"%s\" devno=%o\n",
 297                mnt->mnt_dir,sbuf.st_dev));
 298       if (sbuf.st_dev == devno) {
 299         found = True ;
 300         break ;
 301       }
 302     }
 303
 304     strcpy(name,mnt->mnt_fsname) ;
 305     endmntent(fd) ;
 306 #endif
 307
 308     if ( ! found )
 309       return(False) ;
 310   }
 311
 312   euser_id = geteuid();
 313   user_id = getuid();
 314
 315   setuid(0);  /* Solaris seems to want to give info only to super-user */
 316   seteuid(0);
 317
 318 #if defined(SUNOS5)
 319   DEBUG(5,("disk_quotas: looking for quotas file \"%s\"\n", name));
 320   if((file=open(name, O_RDONLY))<0) {
 321     setuid(user_id);  /* Restore the original UID status */
 322     seteuid(euser_id);
 323     return(False);
 324   }
 325   command.op = Q_GETQUOTA;
 326   command.uid = euser_id;
 327   command.addr = (caddr_t) &D;
 328   ret = ioctl(file, Q_QUOTACTL, &command);
 329   close(file);
 330 #else
 331   DEBUG(5,("disk_quotas: trying quotactl on device \"%s\"\n", name));
 332   ret = quotactl(Q_GETQUOTA, name, euser_id, &D);
 333 #endif
 334
 335   setuid(user_id);  /* Restore the original UID status */
 336   seteuid(euser_id);
 337
 338   if (ret < 0) {
 339     DEBUG(2,("disk_quotas ioctl (Solaris) failed\n"));
 340     return(False);
 341   }
 342
 343
 344   /* Use softlimit to determine disk space. A user exceeding the quota is told
 345    * that there's no space left. Writes might actually work for a bit if the
 346    * hardlimit is set higher than softlimit. Effectively the disk becomes
 347    * made of rubber latex and begins to expand to accommodate the user :-)
 348    */
 349
 350   if (D.dqb_bsoftlimit==0)
 351     return(False);
 352   *bsize = 512;
 353   *dfree = D.dqb_bsoftlimit - D.dqb_curblocks;
 354   *dsize = D.dqb_bsoftlimit;
 355   if(*dfree < 0)
 356     {
 357      *dfree = 0;
 358      *dsize = D.dqb_curblocks;
 359     }
 360
 361 DEBUG(5,("disk_quotas for path \"%s\" returning  bsize %d, dfree %d, dsize %d\n",
 362          path,*bsize,*dfree,*dsize));
 363
 364       return(True);
 365 }
 366
 367 #else
 368
 369 #ifdef        __FreeBSD__
 370 #include <ufs/ufs/quota.h>
 371 #else
 372 #include <sys/quota.h>
 373 #include <devnm.h>
 374 #endif
 375
 376 /****************************************************************************
 377 try to get the disk space from disk quotas - default version
 378 ****************************************************************************/
 379 BOOL disk_quotas(char *path, int *bsize, int *dfree, int *dsize)
 380 {
 381   uid_t user_id, euser_id;
 382   int r;
 383   char dev_disk[256];
 384   struct dqblk D;
 385   struct stat S;
 386 #ifndef __FreeBSD__
 387   /* find the block device file */
 388   if ((stat(path, &S)<0) ||
 389       (devnm(S_IFBLK, S.st_dev, dev_disk, 256, 0)<0)) return (False);
 390 #endif
 391
 392   euser_id = geteuid();
 393
 394 #ifdef USE_SETRES
 395   /* for HPUX, real uid must be same as euid to execute quotactl for euid */
 396   user_id = getuid();
 397   setresuid(euser_id,-1,-1);
 398   r=quotactl(Q_GETQUOTA, dev_disk, euser_id, &D);
 399   if (setresuid(user_id,-1,-1))
 400     DEBUG(5,("Unable to reset uid to %d\n", user_id));
 401 #else
 402 #if defined(__FreeBSD__)
 403   r= quotactl(path,Q_GETQUOTA,euser_id,(char *) &D);
 404 #else
 405   r=quotactl(Q_GETQUOTA, dev_disk, euser_id, &D);
 406 #endif
 407 #endif
 408
 409   /* Use softlimit to determine disk space, except when it has been exceeded */
 410   *bsize = 1024;
 411   if (r)
 412     {
 413       if (errno == EDQUOT)
 414         {
 415           *dfree =0;
 416           *dsize =D.dqb_curblocks;
 417           return (True);
 418         }
 419       else return(False);
 420     }
 421   if (D.dqb_bsoftlimit==0)
 422     return(False);
 423   /* Use softlimit to determine disk space, except when it has been exceeded */
 424   if ((D.dqb_curblocks>D.dqb_bsoftlimit)
 425 #if !defined(__FreeBSD__)
 426 ||(D.dqb_curfiles>D.dqb_fsoftlimit)
 427 #endif
 428     ) {
 429       *dfree = 0;
 430       *dsize = D.dqb_curblocks;
 431     }
 432   else {
 433     *dfree = D.dqb_bsoftlimit - D.dqb_curblocks;
 434     *dsize = D.dqb_bsoftlimit;
 435   }
 436   return (True);
 437 }
 438
 439 #endif
 440
 441 #else
 442 /* this keeps fussy compilers happy */
 443  void quotas_dummy(void) {}
 444 #endif /* QUOTAS */
 445