1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 1994, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley 8 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 9 * Support code is derived from software contributed to Berkeley 10 * by Atsushi Murai (amurai@spec.co.jp). 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/mount.h> 41 #include <sys/bio.h> 42 #include <sys/buf.h> 43 #include <sys/vnode.h> 44 #include <sys/malloc.h> 45 #include <sys/stat.h> 46 #include <sys/mutex.h> 47 48 #include <fs/cd9660/iso.h> 49 #include <fs/cd9660/cd9660_node.h> 50 #include <fs/cd9660/cd9660_mount.h> 51 52 static unsigned cd9660_chars2ui(unsigned char *begin, int len); 53 54 /* 55 * Last reference to an inode, write the inode out and if necessary, 56 * truncate and deallocate the file. 57 */ 58 int 59 cd9660_inactive(struct vop_inactive_args *ap) 60 { 61 struct vnode *vp = ap->a_vp; 62 struct iso_node *ip = VTOI(vp); 63 int error = 0; 64 65 /* 66 * If we are done with the inode, reclaim it 67 * so that it can be reused immediately. 68 */ 69 if (ip->inode.iso_mode == 0) 70 vrecycle(vp); 71 return error; 72 } 73 74 /* 75 * Reclaim an inode so that it can be used for other purposes. 76 */ 77 int 78 cd9660_reclaim(struct vop_reclaim_args *ap) 79 { 80 struct vnode *vp = ap->a_vp; 81 82 /* 83 * Remove the inode from its hash chain. 84 */ 85 vfs_hash_remove(vp); 86 87 /* 88 * Purge old data structures associated with the inode. 89 */ 90 free(vp->v_data, M_ISOFSNODE); 91 vp->v_data = NULL; 92 return (0); 93 } 94 95 /* 96 * File attributes 97 */ 98 void 99 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, 100 struct buf *bp, enum ISO_FTYPE ftype) 101 { 102 struct buf *bp2 = NULL; 103 struct iso_mnt *imp; 104 struct iso_extended_attributes *ap = NULL; 105 int off; 106 107 /* high sierra does not have timezone data, flag is one byte ahead */ 108 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 109 &isodir->date[6]: isodir->flags)&2) { 110 inop->inode.iso_mode = S_IFDIR; 111 /* 112 * If we return 2, fts() will assume there are no subdirectories 113 * (just links for the path and .), so instead we return 1. 114 */ 115 inop->inode.iso_links = 1; 116 } else { 117 inop->inode.iso_mode = S_IFREG; 118 inop->inode.iso_links = 1; 119 } 120 if (!bp 121 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 122 && (off = isonum_711(isodir->ext_attr_length))) { 123 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 124 &bp2); 125 bp = bp2; 126 } 127 if (bp) { 128 ap = (struct iso_extended_attributes *)bp->b_data; 129 130 if (isonum_711(ap->version) == 1) { 131 if (!(ap->perm[0]&0x40)) 132 inop->inode.iso_mode |= S_IXOTH; 133 if (!(ap->perm[0]&0x10)) 134 inop->inode.iso_mode |= S_IROTH; 135 if (!(ap->perm[0]&4)) 136 inop->inode.iso_mode |= S_IXGRP; 137 if (!(ap->perm[0]&1)) 138 inop->inode.iso_mode |= S_IRGRP; 139 if (!(ap->perm[1]&0x40)) 140 inop->inode.iso_mode |= S_IXUSR; 141 if (!(ap->perm[1]&0x10)) 142 inop->inode.iso_mode |= S_IRUSR; 143 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 144 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 145 } else 146 ap = NULL; 147 } 148 if (!ap) { 149 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 150 inop->inode.iso_uid = (uid_t)0; 151 inop->inode.iso_gid = (gid_t)0; 152 } 153 if (bp2) 154 brelse(bp2); 155 } 156 157 /* 158 * Time stamps 159 */ 160 void 161 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 162 struct buf *bp, enum ISO_FTYPE ftype) 163 { 164 struct buf *bp2 = NULL; 165 struct iso_mnt *imp; 166 struct iso_extended_attributes *ap = NULL; 167 int off; 168 169 if (!bp 170 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 171 && (off = isonum_711(isodir->ext_attr_length))) { 172 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 173 &bp2); 174 bp = bp2; 175 } 176 if (bp) { 177 ap = (struct iso_extended_attributes *)bp->b_data; 178 179 if (ftype != ISO_FTYPE_HIGH_SIERRA 180 && isonum_711(ap->version) == 1) { 181 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 182 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 183 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 184 inop->inode.iso_ctime = inop->inode.iso_atime; 185 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 186 inop->inode.iso_mtime = inop->inode.iso_ctime; 187 } else 188 ap = NULL; 189 } 190 if (!ap) { 191 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 192 inop->inode.iso_atime = inop->inode.iso_ctime; 193 inop->inode.iso_mtime = inop->inode.iso_ctime; 194 } 195 if (bp2) 196 brelse(bp2); 197 } 198 199 int 200 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype) 201 { 202 int crtime, days; 203 int y, m, d, hour, minute, second, tz; 204 205 y = pi[0] + 1900; 206 m = pi[1]; 207 d = pi[2]; 208 hour = pi[3]; 209 minute = pi[4]; 210 second = pi[5]; 211 if(ftype != ISO_FTYPE_HIGH_SIERRA) 212 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */ 213 else 214 /* original high sierra misses timezone data */ 215 tz = 0; 216 217 if (y < 1970) { 218 pu->tv_sec = 0; 219 pu->tv_nsec = 0; 220 return 0; 221 } else { 222 #ifdef ORIGINAL 223 /* computes day number relative to Sept. 19th,1989 */ 224 /* don't even *THINK* about changing formula. It works! */ 225 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 226 #else 227 /* 228 * Changed :-) to make it relative to Jan. 1st, 1970 229 * and to disambiguate negative division 230 */ 231 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 232 #endif 233 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 234 235 /* timezone offset is unreliable on some disks */ 236 if (-48 <= tz && tz <= 52) 237 crtime -= tz * 15 * 60; 238 } 239 pu->tv_sec = crtime; 240 pu->tv_nsec = 0; 241 return 1; 242 } 243 244 static u_int 245 cd9660_chars2ui(u_char *begin, int len) 246 { 247 u_int rc; 248 249 for (rc = 0; --len >= 0;) { 250 rc *= 10; 251 rc += *begin++ - '0'; 252 } 253 return rc; 254 } 255 256 int 257 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu) 258 { 259 u_char buf[7]; 260 261 /* year:"0001"-"9999" -> -1900 */ 262 buf[0] = cd9660_chars2ui(pi,4) - 1900; 263 264 /* month: " 1"-"12" -> 1 - 12 */ 265 buf[1] = cd9660_chars2ui(pi + 4,2); 266 267 /* day: " 1"-"31" -> 1 - 31 */ 268 buf[2] = cd9660_chars2ui(pi + 6,2); 269 270 /* hour: " 0"-"23" -> 0 - 23 */ 271 buf[3] = cd9660_chars2ui(pi + 8,2); 272 273 /* minute:" 0"-"59" -> 0 - 59 */ 274 buf[4] = cd9660_chars2ui(pi + 10,2); 275 276 /* second:" 0"-"59" -> 0 - 59 */ 277 buf[5] = cd9660_chars2ui(pi + 12,2); 278 279 /* difference of GMT */ 280 buf[6] = pi[16]; 281 282 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 283 } 284 285 cd_ino_t 286 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 287 { 288 cd_ino_t ino; 289 290 /* 291 * Note there is an inverse calculation in 292 * cd9660_vfsops.c:cd9660_vget_internal(): 293 * ip->iso_start = ino >> imp->im_bshift; 294 * and also a calculation of the isodir pointer 295 * from an inode in cd9660_vnops.c:cd9660_readlink() 296 */ 297 ino = ((cd_ino_t)isonum_733(isodir->extent) + 298 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 299 return ino; 300 } 301