Date: Wed, 10 Jan 2001 21:42:41 +0300 From: andrew deryabin <djsf@sema.ru> To: freebsd-bugs@FreeBSD.ORG Subject: patch for /usr/src/sbin/mount_cd9660/mount_cd9660.c Message-ID: <20010110214241.A2276@technarchy.nodns>
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This helps to mount CDs with extra non-ISOFS (e.g., junk-filled) sessions.
get_ssector() function skips tracks without correct ISOFS signature.
Similar changes in iso_get_ssector() function in /sys/isofs/cd9660/cd9660_vfsops.c
would help to mount such CDs as root (but does anybody use w1nd0ze software for
burning bootable FreeBSD disks? :)
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cu,djsf
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--- mount_cd9660.c.ORiG Sat Oct 9 15:54:08 1999
+++ mount_cd9660.c Wed Jan 10 21:19:04 2001
@@ -57,6 +57,7 @@
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/../isofs/cd9660/cd9660_mount.h>
+#include <sys/../isofs/cd9660/iso.h>
#include <err.h>
#include <stdlib.h>
@@ -194,7 +195,11 @@
struct ioc_toc_header h;
struct ioc_read_toc_entry t;
struct cd_toc_entry toc_buffer[100];
- int fd, ntocentries, i;
+ int fd, ntocentries, i, ssector, blkn;
+ union {
+ char iso_blk[ISO_DEFAULT_BLOCK_SIZE];
+ struct iso_volume_descriptor vd;
+ } blk;
if ((fd = open(dev, O_RDONLY)) == -1)
return -1;
@@ -218,14 +223,25 @@
close(fd);
return -1;
}
- close(fd);
for (i = ntocentries - 1; i >= 0; i--)
- if ((toc_buffer[i].control & 4) != 0)
- /* found a data track */
- break;
- if (i < 0)
- return -1;
+ if ((toc_buffer[i].control & 4) != 0) {
+ /* found a data track, checking for ISOFS signature */
+ /* (stolen from /sys/isofs/cd9660/cd9660_vfsops.c) */
+ ssector = ntohl(toc_buffer[i].addr.lba);
+
+ if (lseek(fd, ISO_DEFAULT_BLOCK_SIZE * (16 + ssector), SEEK_SET) != -1)
+ for (blkn = 100-16; blkn; blkn--) {
+ if (read(fd, &blk, sizeof(blk)) == -1)
+ break;
+ if (!(bcmp(blk.vd.id, ISO_STANDARD_ID, sizeof(blk.vd.id)) &&
+ bcmp(blk.vd.id, ISO_SIERRA_ID, sizeof(blk.vd.id)))) {
+ close(fd);
+ return ssector;
+ }
+ }
+ }
- return ntohl(toc_buffer[i].addr.lba);
+ close(fd);
+ return -1;
}
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