From c1084f3d1cf5dc6d138f43fd874b8066108b8df0 Mon Sep 17 00:00:00 2001 From: millert Date: Sun, 9 Feb 1997 01:10:16 +0000 Subject: [PATCH] Get block size from disklabel. Adds support for setting fs_id for when when we have that in struct fs. --- sbin/fsirand/fsirand.8 | 6 +- sbin/fsirand/fsirand.c | 187 ++++++++++++++++++++++++++++++++--------- 2 files changed, 150 insertions(+), 43 deletions(-) diff --git a/sbin/fsirand/fsirand.8 b/sbin/fsirand/fsirand.8 index 1fd4b39d1d8..cc8b7257b7a 100644 --- a/sbin/fsirand/fsirand.8 +++ b/sbin/fsirand/fsirand.8 @@ -26,7 +26,7 @@ .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF .\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" -.\" $OpenBSD: fsirand.8,v 1.4 1997/02/04 04:44:16 millert Exp $ +.\" $OpenBSD: fsirand.8,v 1.5 1997/02/09 01:10:16 millert Exp $ .\" .Dd January 25, 1997 .Dt FSIRAND 8 @@ -36,6 +36,7 @@ .Nd randomize inode generation numbers .Sh SYNOPSIS .Nm fsirand +.Op Fl b .Op Fl f .Op Fl p .Ar special @@ -60,6 +61,9 @@ but the system should be rebooted via ``reboot -n'' afterwards. .Sh OPTIONS .Bl -tag -width indent The available options are as follows: +.It Fl b +Use the default block size (usuallyt 512 bytes) instead +of the value gleaned from the disklabel. .It Fl f Force .Nm diff --git a/sbin/fsirand/fsirand.c b/sbin/fsirand/fsirand.c index 9e5d9af6057..e102f2c5433 100644 --- a/sbin/fsirand/fsirand.c +++ b/sbin/fsirand/fsirand.c @@ -1,4 +1,4 @@ -/* $OpenBSD: fsirand.c,v 1.4 1997/01/28 04:21:25 millert Exp $ */ +/* $OpenBSD: fsirand.c,v 1.5 1997/02/09 01:10:17 millert Exp $ */ /* * Copyright (c) 1997 Todd C. Miller @@ -31,11 +31,14 @@ */ #ifndef lint -static char rcsid[] = "$OpenBSD: fsirand.c,v 1.4 1997/01/28 04:21:25 millert Exp $"; +static char rcsid[] = "$OpenBSD: fsirand.c,v 1.5 1997/02/09 01:10:17 millert Exp $"; #endif /* not lint */ -#include #include +#include +#include +#include +#include #include #include @@ -50,21 +53,24 @@ static char rcsid[] = "$OpenBSD: fsirand.c,v 1.4 1997/01/28 04:21:25 millert Exp #include void usage __P((int)); -void fsirand __P((char *)); +int fsirand __P((char *)); extern char *__progname; -int printonly = 0, force = 0; +int printonly = 0, force = 0, ignorelabel = 0; int main(argc, argv) int argc; char *argv[]; { - int n; + int n, ex = 0; - while ((n = getopt(argc, argv, "fp")) != -1) { + while ((n = getopt(argc, argv, "bfp")) != -1) { switch (n) { + case 'b': + ignorelabel++; + break; case 'p': printonly++; break; @@ -81,15 +87,15 @@ main(argc, argv) for (n = optind; n < argc; n++) { if (argc - optind != 1) (void)puts(argv[n]); - fsirand(argv[n]); + ex += fsirand(argv[n]); if (n < argc - 1) putchar('\n'); } - exit(0); + exit(ex); } -void +int fsirand(device) char *device; { @@ -98,34 +104,87 @@ fsirand(device) size_t ibufsize; struct fs *sblock; ino_t inumber, maxino; - static daddr_t dblk; - char sbuf[SBSIZE]; - int devfd, n; + daddr_t dblk; + char sbuf[SBSIZE], sbuftmp[SBSIZE]; + int devfd, n, cg; char *devpath; + u_int32_t bsize = DEV_BSIZE; + struct disklabel label; - /* Open device and read in superblock */ if ((devfd = opendev(device, printonly ? O_RDONLY : O_RDWR, - OPENDEV_PART, &devpath)) < 0) - err(1, "Can't open %s", devpath); + OPENDEV_PART, &devpath)) < 0) { + warn("Can't open %s", devpath); + return (1); + } + + /* Get block size (usually 512) from disklabel if possible */ + if (!ignorelabel) { + if (ioctl(devfd, DIOCGDINFO, &label) < 0) + warn("Can't read disklabel, using sector size of %d", + bsize); + else + bsize = label.d_secsize; + } + /* Read in master superblock */ (void)memset(&sbuf, 0, sizeof(sbuf)); sblock = (struct fs *)&sbuf; - if (lseek(devfd, SBOFF, SEEK_SET) == -1) - err(1, "Can't seek to superblock (%qd) on %s", SBOFF, devpath); - if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) - err(1, "Can't read superblock on %s: %s", devpath, + if (lseek(devfd, SBOFF, SEEK_SET) == -1) { + warn("Can't seek to superblock (%qd) on %s", SBOFF, devpath); + return (1); + } + if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { + warnx("Can't read superblock on %s: %s", devpath, (n < SBSIZE) ? "short read" : strerror(errno)); + return (1); + } + maxino = sblock->fs_ncg * sblock->fs_ipg; /* Simple sanity checks on the superblock */ - if (sblock->fs_magic != FS_MAGIC) - errx(1, "Wrong magic number in superblock"); - if (sblock->fs_sbsize > SBSIZE) - errx(1, "Superblock size is preposterous"); - if (!force && !printonly && sblock->fs_clean != FS_ISCLEAN) - errx(1, "Filesystem is not clean, fsck %s before running %s\n", - devpath, __progname); + if (sblock->fs_magic != FS_MAGIC) { + warnx("Bad magic number in superblock"); + return (1); + } + if (sblock->fs_sbsize > SBSIZE) { + warnx("Superblock size is preposterous"); + return (1); + } + if (sblock->fs_postblformat == FS_42POSTBLFMT) { + warnx("Filesystem format is too old, sorry"); + return (1); + } + if (!force && !printonly && sblock->fs_clean != FS_ISCLEAN) { + warnx("Filesystem is not clean, fsck %s first.", devpath); + return (1); + } - maxino = sblock->fs_ncg * sblock->fs_ipg; + /* Make sure backup superblocks are sane. */ + sblock = (struct fs *)&sbuftmp; + for (cg = 0; cg < sblock->fs_ncg; cg++) { + dblk = fsbtodb(sblock, cgsblock(sblock, cg)); + if (lseek(devfd, (off_t)(dblk * bsize), SEEK_SET) < 0) { + warn("Can't seek to %qd", (off_t)(dblk * bsize)); + return (1); + } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { + warn("Can't read backup superblock %d on %s: %s", + cg + 1, devpath, (n < SBSIZE) ? "short write" + : strerror(errno)); + return (1); + } + if (sblock->fs_magic != FS_MAGIC) { + warnx("Bad magic number in backup superblock %d on %s", + cg + 1, devpath); + return (1); + } + if (sblock->fs_sbsize > SBSIZE) { + warnx("Size of backup superblock %d on %s is preposterous", + cg + 1, devpath); + return (1); + } + } + sblock = (struct fs *)&sbuf; + + /* XXX - should really cap buffer at 512kb or so */ ibufsize = sizeof(struct dinode) * sblock->fs_ipg; if (oldibufsize < ibufsize) { if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL) @@ -133,18 +192,61 @@ fsirand(device) oldibufsize = ibufsize; } - /* Randomize inodes a cylinder group at a time */ - for (inumber = 0; inumber < maxino;) { +#ifdef HAVE_FS_ID + if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { + if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0]) + (void)printf("%s was randomized on %s", devpath, + ctime((const time_t *)&(sblock->fs_id[0]))); + (void)printf("fsid: %x %x\n", sblock->fs_id[0], + sblock->fs_id[1]); + } + + /* Randomize fs_id unless old 4.2BSD filesystem */ + if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { + /* Randomize fs_id and write out new sblock and backups */ + sblock->fs_id[0] = (u_int32_t)time(NULL); + sblock->fs_id[1] = arc4random(); + + if (lseek(devfd, SBOFF, SEEK_SET) == -1) { + warn("Can't seek to superblock (%qd) on %s", SBOFF, + devpath); + return (1); + } + if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { + warn("Can't read superblock on %s: %s", devpath, + (n < SBSIZE) ? "short write" : strerror(errno)); + return (1); + } + } +#endif + + /* For each cylinder group, randomize inodes and update backup sblock */ + for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) { +#ifdef HAVE_FS_ID + /* Update superblock if appropriate */ + if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { + dblk = fsbtodb(sblock, cgsblock(sblock, cg)); + if (lseek(devfd, (off_t)(dblk * bsize), SEEK_SET) < 0) { + warn("Can't seek to %qd", (off_t)(dblk * bsize)); + return (1); + } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { + warn("Can't read backup superblock %d on %s: %s", + cg + 1, devpath, (n < SBSIZE) ? "short write" + : strerror(errno)); + return (1); + } + } +#endif + /* Read in inodes, then print or randomize generation nums */ dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); - /* XXX - don't use DEV_BSIZE, get value from disklabel! */ - if (lseek(devfd, (off_t)(dblk * DEV_BSIZE), SEEK_SET) < 0) { - warn("Can't seek to %qd", (off_t)(dblk * DEV_BSIZE)); - return; + if (lseek(devfd, (off_t)(dblk * bsize), SEEK_SET) < 0) { + warn("Can't seek to %qd", (off_t)(dblk * bsize)); + return (1); } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { warnx("Can't read inodes: %s", (n < ibufsize) ? "short read" : strerror(errno)); - return; + return (1); } for (n = 0; n < sblock->fs_ipg; n++, inumber++) { @@ -159,28 +261,29 @@ fsirand(device) /* Write out modified inodes */ if (!printonly) { - /* XXX - don't use DEV_BSIZE, get from disklabel! */ - if (lseek(devfd, (off_t)(dblk * DEV_BSIZE), SEEK_SET) < 0) { + if (lseek(devfd, (off_t)(dblk * bsize), SEEK_SET) < 0) { warn("Can't seek to %qd", - (off_t)(dblk * DEV_BSIZE)); - return; + (off_t)(dblk * bsize)); + return (1); } else if ((n = write(devfd, inodebuf, ibufsize)) != ibufsize) { - errx(1, "Can't write inodes: %s", + warnx("Can't write inodes: %s", (n != ibufsize) ? "short write" : strerror(errno)); - return; + return (1); } } } (void)close(devfd); + + return(0); } void usage(ex) int ex; { - (void)fprintf(stderr, "Usage: %s [ -p ] special [special ...]\n", + (void)fprintf(stderr, "Usage: %s [ -b ] [ -f ] [ -p ] special [special ...]\n", __progname); exit(ex); } -- 2.20.1