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/param.h> 38 #include <sys/systm.h> 39 #include <sys/mount.h> 40 #include <sys/bio.h> 41 #include <sys/buf.h> 42 #include <sys/vnode.h> 43 #include <sys/malloc.h> 44 #include <sys/stat.h> 45 #include <sys/mutex.h> 46 47 #include <fs/cd9660/iso.h> 48 #include <fs/cd9660/cd9660_node.h> 49 #include <fs/cd9660/cd9660_mount.h> 50 51 static unsigned cd9660_chars2ui(unsigned char *begin, int len); 52 53 /* 54 * Last reference to an inode, write the inode out and if necessary, 55 * truncate and deallocate the file. 56 */ 57 int 58 cd9660_inactive(struct vop_inactive_args *ap) 59 { 60 struct vnode *vp = ap->a_vp; 61 struct iso_node *ip = VTOI(vp); 62 int error = 0; 63 64 /* 65 * If we are done with the inode, reclaim it 66 * so that it can be reused immediately. 67 */ 68 if (ip->inode.iso_mode == 0) 69 vrecycle(vp); 70 return error; 71 } 72 73 /* 74 * Reclaim an inode so that it can be used for other purposes. 75 */ 76 int 77 cd9660_reclaim(struct vop_reclaim_args *ap) 78 { 79 struct vnode *vp = ap->a_vp; 80 81 /* 82 * Remove the inode from its hash chain. 83 */ 84 vfs_hash_remove(vp); 85 86 /* 87 * Purge old data structures associated with the inode. 88 */ 89 free(vp->v_data, M_ISOFSNODE); 90 vp->v_data = NULL; 91 return (0); 92 } 93 94 /* 95 * File attributes 96 */ 97 void 98 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, 99 struct buf *bp, enum ISO_FTYPE ftype) 100 { 101 struct buf *bp2 = NULL; 102 struct iso_mnt *imp; 103 struct iso_extended_attributes *ap = NULL; 104 int off; 105 106 /* high sierra does not have timezone data, flag is one byte ahead */ 107 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 108 &isodir->date[6]: isodir->flags)&2) { 109 inop->inode.iso_mode = S_IFDIR; 110 /* 111 * If we return 2, fts() will assume there are no subdirectories 112 * (just links for the path and .), so instead we return 1. 113 */ 114 inop->inode.iso_links = 1; 115 } else { 116 inop->inode.iso_mode = S_IFREG; 117 inop->inode.iso_links = 1; 118 } 119 if (!bp 120 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 121 && (off = isonum_711(isodir->ext_attr_length))) { 122 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 123 &bp2); 124 bp = bp2; 125 } 126 if (bp) { 127 ap = (struct iso_extended_attributes *)bp->b_data; 128 129 if (isonum_711(ap->version) == 1) { 130 if (!(ap->perm[0]&0x40)) 131 inop->inode.iso_mode |= S_IXOTH; 132 if (!(ap->perm[0]&0x10)) 133 inop->inode.iso_mode |= S_IROTH; 134 if (!(ap->perm[0]&4)) 135 inop->inode.iso_mode |= S_IXGRP; 136 if (!(ap->perm[0]&1)) 137 inop->inode.iso_mode |= S_IRGRP; 138 if (!(ap->perm[1]&0x40)) 139 inop->inode.iso_mode |= S_IXUSR; 140 if (!(ap->perm[1]&0x10)) 141 inop->inode.iso_mode |= S_IRUSR; 142 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 143 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 144 } else 145 ap = NULL; 146 } 147 if (!ap) { 148 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 149 inop->inode.iso_uid = (uid_t)0; 150 inop->inode.iso_gid = (gid_t)0; 151 } 152 if (bp2) 153 brelse(bp2); 154 } 155 156 /* 157 * Time stamps 158 */ 159 void 160 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 161 struct buf *bp, enum ISO_FTYPE ftype) 162 { 163 struct buf *bp2 = NULL; 164 struct iso_mnt *imp; 165 struct iso_extended_attributes *ap = NULL; 166 int off; 167 168 if (!bp 169 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 170 && (off = isonum_711(isodir->ext_attr_length))) { 171 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 172 &bp2); 173 bp = bp2; 174 } 175 if (bp) { 176 ap = (struct iso_extended_attributes *)bp->b_data; 177 178 if (ftype != ISO_FTYPE_HIGH_SIERRA 179 && isonum_711(ap->version) == 1) { 180 /* 181 * The extended attributes include create 182 * (ctime), modify (mtime), expiration 183 * (xtime), and effective (ftime) timstamps. 184 * Only the first two are meaningful for struct 185 * stat. 186 */ 187 if (!cd9660_tstamp_conv17(ap->ctime, 188 &inop->inode.iso_birthtime)) 189 memset(&inop->inode.iso_birthtime, 0, 190 sizeof(inop->inode.iso_birthtime)); 191 if (!cd9660_tstamp_conv17(ap->mtime, 192 &inop->inode.iso_mtime)) 193 inop->inode.iso_mtime = 194 inop->inode.iso_birthtime; 195 inop->inode.iso_ctime = inop->inode.iso_mtime; 196 inop->inode.iso_atime = inop->inode.iso_mtime; 197 } else 198 ap = NULL; 199 } 200 if (!ap) { 201 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 202 inop->inode.iso_atime = inop->inode.iso_ctime; 203 inop->inode.iso_mtime = inop->inode.iso_ctime; 204 inop->inode.iso_birthtime = inop->inode.iso_ctime; 205 } 206 if (bp2) 207 brelse(bp2); 208 } 209 210 int 211 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype) 212 { 213 int crtime, days; 214 int y, m, d, hour, minute, second, tz; 215 216 y = pi[0] + 1900; 217 m = pi[1]; 218 d = pi[2]; 219 hour = pi[3]; 220 minute = pi[4]; 221 second = pi[5]; 222 if(ftype != ISO_FTYPE_HIGH_SIERRA) 223 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */ 224 else 225 /* original high sierra misses timezone data */ 226 tz = 0; 227 228 if (y < 1970) { 229 pu->tv_sec = 0; 230 pu->tv_nsec = 0; 231 return 0; 232 } else { 233 #ifdef ORIGINAL 234 /* computes day number relative to Sept. 19th,1989 */ 235 /* don't even *THINK* about changing formula. It works! */ 236 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 237 #else 238 /* 239 * Changed :-) to make it relative to Jan. 1st, 1970 240 * and to disambiguate negative division 241 */ 242 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 243 #endif 244 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 245 246 /* timezone offset is unreliable on some disks */ 247 if (-48 <= tz && tz <= 52) 248 crtime -= tz * 15 * 60; 249 } 250 pu->tv_sec = crtime; 251 pu->tv_nsec = 0; 252 return 1; 253 } 254 255 static u_int 256 cd9660_chars2ui(u_char *begin, int len) 257 { 258 u_int rc; 259 260 for (rc = 0; --len >= 0;) { 261 rc *= 10; 262 rc += *begin++ - '0'; 263 } 264 return rc; 265 } 266 267 int 268 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu) 269 { 270 u_char buf[7]; 271 272 /* year:"0001"-"9999" -> -1900 */ 273 buf[0] = cd9660_chars2ui(pi,4) - 1900; 274 275 /* month: " 1"-"12" -> 1 - 12 */ 276 buf[1] = cd9660_chars2ui(pi + 4,2); 277 278 /* day: " 1"-"31" -> 1 - 31 */ 279 buf[2] = cd9660_chars2ui(pi + 6,2); 280 281 /* hour: " 0"-"23" -> 0 - 23 */ 282 buf[3] = cd9660_chars2ui(pi + 8,2); 283 284 /* minute:" 0"-"59" -> 0 - 59 */ 285 buf[4] = cd9660_chars2ui(pi + 10,2); 286 287 /* second:" 0"-"59" -> 0 - 59 */ 288 buf[5] = cd9660_chars2ui(pi + 12,2); 289 290 /* difference of GMT */ 291 buf[6] = pi[16]; 292 293 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 294 } 295 296 ino_t 297 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 298 { 299 ino_t ino; 300 301 /* 302 * Note there is an inverse calculation in 303 * cd9660_vfsops.c:cd9660_vget_internal(): 304 * ip->iso_start = ino >> imp->im_bshift; 305 * and also a calculation of the isodir pointer 306 * from an inode in cd9660_vnops.c:cd9660_readlink() 307 */ 308 ino = ((ino_t)isonum_733(isodir->extent) + 309 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 310 return ino; 311 } 312