| 1 | /*
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| 2 | * Unix SMB/CIFS implementation.
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| 3 | * System QUOTA function wrappers for QUOTACTL_4B
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| 4 |
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| 5 | * Copyright (C) 2011 James Peach.
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| 6 | *
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| 7 | * This program is free software; you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation; either version 2 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * This program is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with this program; if not, write to the Free Software
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| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 20 | */
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| 21 |
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| 22 | #include "includes.h"
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| 23 |
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| 24 | #undef DBGC_CLASS
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| 25 | #define DBGC_CLASS DBGC_QUOTA
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| 26 |
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| 27 | #ifndef HAVE_SYS_QUOTAS
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| 28 | #undef HAVE_QUOTACTL_4B
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| 29 | #endif
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| 30 |
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| 31 | #ifdef HAVE_QUOTACTL_4B
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| 32 | /* int quotactl(const char *path, int cmd, int id, char *addr)
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| 33 | *
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| 34 | * This is used by many (all?) BSD-derived systems. This implementation has
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| 35 | * been developed and tested on Darwin, but may also work on other BSD systems.
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| 36 | */
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| 37 |
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| 38 | #ifdef HAVE_SYS_TYPES_H
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| 39 | #include <sys/types.h>
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| 40 | #endif
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| 41 |
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| 42 | #ifdef HAVE_SYS_QUOTA_H
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| 43 | #include <sys/quota.h>
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| 44 | #endif
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| 45 |
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| 46 | #ifdef HAVE_UFS_UFS_QUOTA_H
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| 47 | #include <ufs/ufs/quota.h>
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| 48 | #endif
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| 49 |
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| 50 | #if defined(DARWINOS)
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| 51 | /* WorkARound broken HFS access checks in hfs_quotactl. Darwin only(?) */
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| 52 | #define HFS_QUOTACTL_WAR 1
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| 53 | #endif
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| 54 |
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| 55 | static void xlate_qblk_to_smb(const struct dqblk * const qblk,
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| 56 | SMB_DISK_QUOTA *dp)
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| 57 | {
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| 58 | ZERO_STRUCTP(dp);
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| 59 |
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| 60 | DEBUG(10, ("unix softlimit=%u hardlimit=%u curblock=%u\n",
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| 61 | (unsigned)qblk->dqb_bsoftlimit, (unsigned)qblk->dqb_bhardlimit,
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| 62 | #ifdef HAVE_STRUCT_DQBLK_DQB_CURBYTES
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| 63 | (unsigned)qblk->dqb_curbytes));
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| 64 | #else
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| 65 | (unsigned)qblk->dqb_curblocks));
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| 66 | #endif
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| 67 |
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| 68 | DEBUGADD(10, ("unix softinodes=%u hardinodes=%u curinodes=%u\n",
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| 69 | (unsigned)qblk->dqb_isoftlimit, (unsigned)qblk->dqb_ihardlimit,
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| 70 | (unsigned)qblk->dqb_curinodes));
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| 71 |
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| 72 | #ifdef HAVE_STRUCT_DQBLK_DQB_CURBYTES
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| 73 | /* On Darwin, quotas are counted in bytes. We report them
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| 74 | * in 512b blocks because various callers have assumptions
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| 75 | * about the block size.
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| 76 | */
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| 77 | #define XLATE_TO_BLOCKS(bytes) (((bytes) + 1) / 512)
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| 78 | dp->bsize = 512;
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| 79 |
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| 80 | dp->softlimit = XLATE_TO_BLOCKS(qblk->dqb_bsoftlimit);
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| 81 | dp->hardlimit = XLATE_TO_BLOCKS(qblk->dqb_bhardlimit);
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| 82 | dp->curblocks = XLATE_TO_BLOCKS(qblk->dqb_curbytes);
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| 83 | #undef XLATE_TO_BLOCKS
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| 84 | #else
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| 85 | dp->bsize = DEV_BSIZE;
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| 86 |
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| 87 | dp->softlimit = qblk->dqb_bsoftlimit;
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| 88 | dp->hardlimit = qblk->dqb_bhardlimit;
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| 89 | dp->curblocks = qblk->dqb_curblocks;
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| 90 | #endif
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| 91 |
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| 92 | dp->ihardlimit = qblk->dqb_ihardlimit;
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| 93 | dp->isoftlimit = qblk->dqb_isoftlimit;
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| 94 | dp->curinodes = qblk->dqb_curinodes;
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| 95 |
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| 96 | dp->qflags = QUOTAS_ENABLED | QUOTAS_DENY_DISK;
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| 97 |
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| 98 | DEBUG(10, ("softlimit=%u hardlimit=%u curblock=%u\n",
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| 99 | (unsigned)dp->softlimit, (unsigned)dp->hardlimit,
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| 100 | (unsigned)dp->curblocks));
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| 101 |
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| 102 | DEBUGADD(10, ("softinodes=%u hardinodes=%u curinodes=%u\n",
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| 103 | (unsigned)dp->isoftlimit, (unsigned)dp->ihardlimit,
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| 104 | (unsigned)dp->curinodes));
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| 105 |
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| 106 | }
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| 107 |
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| 108 | static void xlate_smb_to_qblk(const SMB_DISK_QUOTA * const dp,
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| 109 | struct dqblk *qblk)
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| 110 | {
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| 111 | ZERO_STRUCTP(qblk);
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| 112 |
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| 113 | qblk->dqb_bsoftlimit = dp->softlimit;
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| 114 | qblk->dqb_bhardlimit = dp->hardlimit;
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| 115 | #ifdef HAVE_STRUCT_DQBLK_DQB_CURBYTES
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| 116 | /* On Darwin, quotas are counted in bytes. */
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| 117 | qblk->dqb_bsoftlimit *= dp->bsize;
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| 118 | qblk->dqb_bhardlimit *= dp->bsize;
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| 119 | #endif
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| 120 | qblk->dqb_ihardlimit = dp->ihardlimit;
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| 121 | qblk->dqb_isoftlimit = dp->isoftlimit;
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| 122 | }
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| 123 |
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| 124 | static int sys_quotactl_4B(const char * path, int cmd,
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| 125 | int id, struct dqblk *qblk)
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| 126 | {
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| 127 | int ret;
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| 128 |
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| 129 | /* NB: We must test GRPQUOTA here, because USRQUOTA is 0. */
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| 130 | DEBUG(10, ("%s quota for %s ID %u on %s\n",
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| 131 | (cmd & QCMD(Q_GETQUOTA, 0)) ? "getting" : "setting",
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| 132 | (cmd & QCMD(0, GRPQUOTA)) ? "group" : "user",
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| 133 | (unsigned)id, path));
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| 134 |
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| 135 | #ifdef HFS_QUOTACTL_WAR
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| 136 | become_root();
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| 137 | #endif /* HFS_QUOTACTL_WAR */
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| 138 |
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| 139 | ret = quotactl(path, cmd, id, qblk);
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| 140 | if (ret == -1) {
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| 141 | /* ENOTSUP means quota support is not compiled in. EINVAL
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| 142 | * means that quotas are not configured (commonly).
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| 143 | */
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| 144 | if (errno != ENOTSUP && errno != EINVAL) {
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| 145 | DEBUG(0, ("failed to %s quota for %s ID %u on %s: %s\n",
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| 146 | (cmd & QCMD(Q_GETQUOTA, 0)) ? "get" : "set",
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| 147 | (cmd & QCMD(0, GRPQUOTA)) ? "group" : "user",
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| 148 | (unsigned)id, path, strerror(errno)));
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| 149 | }
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| 150 |
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| 151 | #ifdef HFS_QUOTACTL_WAR
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| 152 | unbecome_root();
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| 153 | #endif /* HFS_QUOTACTL_WAR */
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| 154 |
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| 155 |
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| 156 | return -1;
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| 157 | }
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| 158 |
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| 159 | #ifdef HFS_QUOTACTL_WAR
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| 160 | unbecome_root();
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| 161 | #endif /* HFS_QUOTACTL_WAR */
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| 162 |
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| 163 | return 0;
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| 164 | }
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| 165 |
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| 166 | int sys_get_vfs_quota(const char *path, const char *bdev,
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| 167 | enum SMB_QUOTA_TYPE qtype, unid_t id, SMB_DISK_QUOTA *dp)
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| 168 | {
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| 169 | int ret;
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| 170 | struct dqblk qblk;
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| 171 |
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| 172 | ZERO_STRUCT(qblk);
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| 173 |
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| 174 | switch (qtype) {
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| 175 | case SMB_USER_QUOTA_TYPE:
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| 176 | /* Get quota for provided UID. */
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| 177 | ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, USRQUOTA),
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| 178 | id.uid, &qblk);
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| 179 | break;
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| 180 | case SMB_USER_FS_QUOTA_TYPE:
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| 181 | /* Get quota for current UID. */
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| 182 | ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, USRQUOTA),
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| 183 | geteuid(), &qblk);
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| 184 | break;
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| 185 | case SMB_GROUP_QUOTA_TYPE:
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| 186 | /* Get quota for provided GID. */
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| 187 | ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, GRPQUOTA),
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| 188 | id.gid, &qblk);
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| 189 | break;
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| 190 | case SMB_GROUP_FS_QUOTA_TYPE:
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| 191 | /* Get quota for current GID. */
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| 192 | ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, GRPQUOTA),
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| 193 | getegid(), &qblk);
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| 194 | break;
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| 195 | default:
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| 196 | DEBUG(0, ("cannot get unsupported quota type: %u\n",
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| 197 | (unsigned)qtype));
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| 198 | errno = ENOSYS;
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| 199 | return -1;
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| 200 | }
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| 201 |
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| 202 | if (ret == -1) {
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| 203 | return -1;
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| 204 | }
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| 205 |
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| 206 | xlate_qblk_to_smb(&qblk, dp);
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| 207 | dp->qtype = qtype;
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| 208 |
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| 209 | return ret;
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| 210 | }
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| 211 |
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| 212 | int sys_set_vfs_quota(const char *path, const char *bdev,
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| 213 | enum SMB_QUOTA_TYPE qtype, unid_t id, SMB_DISK_QUOTA *dp)
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| 214 | {
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| 215 | struct dqblk qblk;
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| 216 |
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| 217 | xlate_smb_to_qblk(dp, &qblk);
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| 218 |
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| 219 | switch (qtype) {
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| 220 | case SMB_USER_QUOTA_TYPE:
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| 221 | /* Set quota for provided UID. */
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| 222 | return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, USRQUOTA),
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| 223 | id.uid, &qblk);
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| 224 | case SMB_USER_FS_QUOTA_TYPE:
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| 225 | /* Set quota for current UID. */
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| 226 | return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, USRQUOTA),
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| 227 | geteuid(), &qblk);
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| 228 | case SMB_GROUP_QUOTA_TYPE:
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| 229 | /* Set quota for provided GID. */
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| 230 | return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, GRPQUOTA),
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| 231 | id.gid, &qblk);
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| 232 | case SMB_GROUP_FS_QUOTA_TYPE:
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| 233 | /* Set quota for current GID. */
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| 234 | return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, GRPQUOTA),
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| 235 | getegid(), &qblk);
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| 236 | default:
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| 237 | DEBUG(0, ("cannot set unsupported quota type: %u\n",
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| 238 | (unsigned)qtype));
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| 239 | errno = ENOSYS;
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| 240 | return -1;
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| 241 | }
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| 242 | }
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| 243 |
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| 244 | #endif /* HAVE_QUOTACTL_4B */
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