mount_cd9660.c revision 74097
1/* 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley 6 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 7 * Support code is derived from software contributed to Berkeley 8 * by Atsushi Murai (amurai@spec.co.jp). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)mount_cd9660.c 8.7 (Berkeley) 5/1/95 39 */ 40 41#ifndef lint 42static char copyright[] = 43"@(#) Copyright (c) 1992, 1993, 1994\n\ 44 The Regents of the University of California. All rights reserved.\n"; 45#endif /* not lint */ 46 47#ifndef lint 48/* 49static char sccsid[] = "@(#)mount_cd9660.c 8.7 (Berkeley) 5/1/95"; 50*/ 51static const char rcsid[] = 52 "$FreeBSD: head/sbin/mount_cd9660/mount_cd9660.c 74097 2001-03-11 10:06:28Z bp $"; 53#endif /* not lint */ 54 55#include <sys/cdio.h> 56#include <sys/file.h> 57#include <sys/param.h> 58#include <sys/mount.h> 59#include <sys/../isofs/cd9660/cd9660_mount.h> 60 61#include <err.h> 62#include <errno.h> 63#include <stdlib.h> 64#include <stdio.h> 65#include <string.h> 66#include <sysexits.h> 67#include <unistd.h> 68 69#include "mntopts.h" 70 71struct mntopt mopts[] = { 72 MOPT_STDOPTS, 73 MOPT_UPDATE, 74 { "extatt", 0, ISOFSMNT_EXTATT, 1 }, 75 { "gens", 0, ISOFSMNT_GENS, 1 }, 76 { "rrip", 1, ISOFSMNT_NORRIP, 1 }, 77 { "joliet", 1, ISOFSMNT_NOJOLIET, 1 }, 78 { "strictjoliet", 1, ISOFSMNT_BROKENJOLIET, 1 }, 79 { NULL } 80}; 81 82int get_ssector(const char *dev); 83void usage(void); 84 85int 86main(int argc, char **argv) 87{ 88 struct iso_args args; 89 int ch, mntflags, opts; 90 char *dev, *dir, mntpath[MAXPATHLEN]; 91 struct vfsconf vfc; 92 int error, verbose; 93 94 mntflags = opts = verbose = 0; 95 memset(&args, 0, sizeof args); 96 args.ssector = -1; 97 while ((ch = getopt(argc, argv, "begjo:rs:v")) != -1) 98 switch (ch) { 99 case 'b': 100 opts |= ISOFSMNT_BROKENJOLIET; 101 break; 102 case 'e': 103 opts |= ISOFSMNT_EXTATT; 104 break; 105 case 'g': 106 opts |= ISOFSMNT_GENS; 107 break; 108 case 'j': 109 opts |= ISOFSMNT_NOJOLIET; 110 break; 111 case 'o': 112 getmntopts(optarg, mopts, &mntflags, &opts); 113 break; 114 case 'r': 115 opts |= ISOFSMNT_NORRIP; 116 break; 117 case 's': 118 args.ssector = atoi(optarg); 119 break; 120 case 'v': 121 verbose++; 122 break; 123 case '?': 124 default: 125 usage(); 126 } 127 argc -= optind; 128 argv += optind; 129 130 if (argc != 2) 131 usage(); 132 133 dev = argv[0]; 134 dir = argv[1]; 135 136 /* 137 * Resolve the mountpoint with realpath(3) and remove unnecessary 138 * slashes from the devicename if there are any. 139 */ 140 (void)checkpath(dir, mntpath); 141 (void)rmslashes(dev, dev); 142 143#define DEFAULT_ROOTUID -2 144 /* 145 * ISO 9660 filesystems are not writeable. 146 */ 147 mntflags |= MNT_RDONLY; 148 args.export.ex_flags = MNT_EXRDONLY; 149 args.fspec = dev; 150 args.export.ex_root = DEFAULT_ROOTUID; 151 args.flags = opts; 152 153 if (args.ssector == -1) { 154 /* 155 * The start of the session has not been specified on 156 * the command line. If we can successfully read the 157 * TOC of a CD-ROM, use the last data track we find. 158 * Otherwise, just use 0, in order to mount the very 159 * first session. This is compatible with the 160 * historic behaviour of mount_cd9660(8). If the user 161 * has specified -s <ssector> above, we don't get here 162 * and leave the user's will. 163 */ 164 if ((args.ssector = get_ssector(dev)) == -1) { 165 if (verbose) 166 printf("could not determine starting sector, " 167 "using very first session\n"); 168 args.ssector = 0; 169 } else if (verbose) 170 printf("using starting sector %d\n", args.ssector); 171 } 172 173 error = getvfsbyname("cd9660", &vfc); 174 if (error && vfsisloadable("cd9660")) { 175 if (vfsload("cd9660")) 176 err(EX_OSERR, "vfsload(cd9660)"); 177 endvfsent(); /* flush cache */ 178 error = getvfsbyname("cd9660", &vfc); 179 } 180 if (error) 181 errx(1, "cd9660 filesystem is not available"); 182 183 if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0) 184 err(1, "%s", args.fspec); 185 exit(0); 186} 187 188void 189usage(void) 190{ 191 (void)fprintf(stderr, 192 "usage: mount_cd9660 [-egrv] [-o options] [-s startsector] special node\n"); 193 exit(EX_USAGE); 194} 195 196int 197get_ssector(const char *dev) 198{ 199 struct ioc_toc_header h; 200 struct ioc_read_toc_entry t; 201 struct cd_toc_entry toc_buffer[100]; 202 int fd, ntocentries, i; 203 204 if ((fd = open(dev, O_RDONLY)) == -1) 205 return -1; 206 if (ioctl(fd, CDIOREADTOCHEADER, &h) == -1) { 207 close(fd); 208 return -1; 209 } 210 211 ntocentries = h.ending_track - h.starting_track + 1; 212 if (ntocentries > 100) { 213 /* unreasonable, only 100 allowed */ 214 close(fd); 215 return -1; 216 } 217 t.address_format = CD_LBA_FORMAT; 218 t.starting_track = 0; 219 t.data_len = ntocentries * sizeof(struct cd_toc_entry); 220 t.data = toc_buffer; 221 222 if (ioctl(fd, CDIOREADTOCENTRYS, (char *) &t) == -1) { 223 close(fd); 224 return -1; 225 } 226 close(fd); 227 228 for (i = ntocentries - 1; i >= 0; i--) 229 if ((toc_buffer[i].control & 4) != 0) 230 /* found a data track */ 231 break; 232 if (i < 0) 233 return -1; 234 235 return ntohl(toc_buffer[i].addr.lba); 236} 237