OpenBSD-4.6/sbin/restore/tape.c
/* $OpenBSD: tape.c,v 1.37 2008/09/03 23:11:59 krw Exp $ */
/* $NetBSD: tape.c,v 1.26 1997/04/15 07:12:25 lukem Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)tape.c 8.6 (Berkeley) 9/13/94";
#else
static const char rcsid[] = "$OpenBSD: tape.c,v 1.37 2008/09/03 23:11:59 krw Exp $";
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <sys/stat.h>
#include <sys/endian.h>
#include <ufs/ufs/dinode.h>
#include <protocols/dumprestore.h>
#include <err.h>
#include <fcntl.h>
#include <paths.h>
#include <setjmp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "restore.h"
#include "extern.h"
static long fssize = MAXBSIZE;
static int mt = -1;
static int pipein = 0;
static char magtape[BUFSIZ];
static int blkcnt;
static int numtrec;
static char *tapebuf;
static union u_spcl endoftapemark;
static long blksread; /* blocks read since last header */
static long tpblksread = 0; /* TP_BSIZE blocks read */
static long tapesread;
static jmp_buf restart;
static int gettingfile = 0; /* restart has a valid frame */
static char *host = NULL;
static int ofile;
static char *map;
static char lnkbuf[MAXPATHLEN + 1];
static size_t pathlen;
int oldinofmt; /* old inode format conversion required */
int Bcvt; /* Swap Bytes (for CCI or sun) */
#define FLUSHTAPEBUF() blkcnt = ntrec + 1
union u_ospcl {
char dummy[TP_BSIZE];
struct s_ospcl {
int32_t c_type;
int32_t c_date;
int32_t c_ddate;
int32_t c_volume;
int32_t c_tapea;
u_int16_t c_inumber;
int32_t c_magic;
int32_t c_checksum;
struct odinode {
unsigned short odi_mode;
u_int16_t odi_nlink;
u_int16_t odi_uid;
u_int16_t odi_gid;
int32_t odi_size;
int32_t odi_rdev;
char odi_addr[36];
int32_t odi_atime;
int32_t odi_mtime;
int32_t odi_ctime;
} c_odinode;
int32_t c_count;
char c_addr[256];
} s_ospcl;
};
static void accthdr(struct s_spcl *);
static int checksum(int *);
static void findinode(struct s_spcl *);
static void findtapeblksize(void);
static int gethead(struct s_spcl *);
static void readtape(char *);
static void setdumpnum(void);
static void swap_header(struct s_spcl *);
static void swap_old_header(struct s_ospcl *);
static void terminateinput(void);
static void xtrfile(char *, size_t);
static void xtrlnkfile(char *, size_t);
static void xtrlnkskip(char *, size_t);
static void xtrmap(char *, size_t);
static void xtrmapskip(char *, size_t);
static void xtrskip(char *, size_t);
/*
* Set up an input source
*/
void
setinput(char *source)
{
FLUSHTAPEBUF();
if (bflag)
newtapebuf(ntrec);
else
/* Max out buffer size, let findtapeblksize() set ntrec. */
newtapebuf(MAXBSIZE / TP_BSIZE);
terminal = stdin;
#ifdef RRESTORE
if (strchr(source, ':')) {
host = source;
source = strchr(host, ':');
*source++ = '\0';
if (rmthost(host) == 0)
exit(1);
} else
#endif
if (strcmp(source, "-") == 0) {
/*
* Since input is coming from a pipe we must establish
* our own connection to the terminal.
*/
terminal = fopen(_PATH_TTY, "r");
if (terminal == NULL) {
warn("cannot open %s", _PATH_TTY);
terminal = fopen(_PATH_DEVNULL, "r");
if (terminal == NULL)
err(1, "cannot open %s", _PATH_DEVNULL);
}
pipein++;
}
(void)strlcpy(magtape, source, sizeof magtape);
}
void
newtapebuf(long size)
{
static long tapebufsize = -1;
ntrec = size;
if (size <= tapebufsize)
return;
if (tapebuf != NULL)
free(tapebuf);
tapebuf = calloc(size, TP_BSIZE);
if (tapebuf == NULL)
errx(1, "Cannot allocate space for tape buffer");
tapebufsize = size;
}
/*
* Verify that the tape drive can be accessed and
* that it actually is a dump tape.
*/
void
setup(void)
{
int i, j, *ip;
struct stat stbuf;
Vprintf(stdout, "Verify tape and initialize maps\n");
#ifdef RRESTORE
if (host)
mt = rmtopen(magtape, 0);
else
#endif
if (pipein)
mt = 0;
else
mt = open(magtape, O_RDONLY);
if (mt < 0)
err(1, "%s", magtape);
volno = 1;
setdumpnum();
FLUSHTAPEBUF();
if (!pipein && !bflag)
findtapeblksize();
if (gethead(&spcl) == FAIL) {
blkcnt--; /* push back this block */
blksread--;
tpblksread--;
cvtflag++;
if (gethead(&spcl) == FAIL)
errx(1, "Tape is not a dump tape");
(void)fputs("Converting to new file system format.\n", stderr);
}
if (pipein) {
endoftapemark.s_spcl.c_magic = cvtflag ? OFS_MAGIC :
FS_UFS2_MAGIC;
endoftapemark.s_spcl.c_type = TS_END;
ip = (int *)&endoftapemark;
j = sizeof(union u_spcl) / sizeof(int);
i = 0;
do
i += *ip++;
while (--j);
endoftapemark.s_spcl.c_checksum = CHECKSUM - i;
}
if (vflag || command == 't')
printdumpinfo();
dumptime = (time_t)spcl.c_ddate;
dumpdate = (time_t)spcl.c_date;
if (stat(".", &stbuf) < 0)
err(1, "cannot stat .");
if (stbuf.st_blksize > 0 && stbuf.st_blksize < TP_BSIZE )
fssize = TP_BSIZE;
if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE)
fssize = stbuf.st_blksize;
if (((fssize - 1) & fssize) != 0)
errx(1, "bad block size %ld", fssize);
if (spcl.c_volume != 1)
errx(1, "Tape is not volume 1 of the dump");
if (gethead(&spcl) == FAIL) {
Dprintf(stdout, "header read failed at %ld blocks\n", blksread);
panic("no header after volume mark!\n");
}
findinode(&spcl);
if (spcl.c_type != TS_CLRI)
errx(1, "Cannot find file removal list");
maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1;
Dprintf(stdout, "maxino = %d\n", maxino);
map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
if (map == NULL)
panic("no memory for active inode map\n");
usedinomap = map;
curfile.action = USING;
getfile(xtrmap, xtrmapskip);
if (spcl.c_type != TS_BITS)
errx(1, "Cannot find file dump list");
map = calloc((size_t)1, (size_t)howmany(maxino, NBBY));
if (map == NULL)
panic("no memory for file dump list\n");
dumpmap = map;
curfile.action = USING;
getfile(xtrmap, xtrmapskip);
}
/*
* Prompt user to load a new dump volume.
* "Nextvol" is the next suggested volume to use.
* This suggested volume is enforced when doing full
* or incremental restores, but can be overrridden by
* the user when only extracting a subset of the files.
*/
void
getvol(long nextvol)
{
long newvol = 0, savecnt = 0, wantnext = 0, i;
union u_spcl tmpspcl;
# define tmpbuf tmpspcl.s_spcl
char buf[TP_BSIZE];
const char *errstr;
if (nextvol == 1) {
tapesread = 0;
gettingfile = 0;
}
if (pipein) {
if (nextvol != 1)
panic("Changing volumes on pipe input?\n");
if (volno == 1)
return;
goto gethdr;
}
savecnt = blksread;
again:
if (pipein)
exit(1); /* pipes do not get a second chance */
if (command == 'R' || command == 'r' || curfile.action != SKIP) {
newvol = nextvol;
wantnext = 1;
} else {
newvol = 0;
wantnext = 0;
}
while (newvol <= 0) {
if (tapesread == 0) {
fprintf(stderr, "%s%s%s%s%s",
"You have not read any tapes yet.\n",
"Unless you know which volume your",
" file(s) are on you should start\n",
"with the last volume and work",
" towards the first.\n");
} else {
fprintf(stderr, "You have read volumes");
strlcpy(buf, ": ", sizeof buf);
for (i = 1; i < 32; i++)
if (tapesread & (1 << i)) {
fprintf(stderr, "%s%ld", buf, i);
strlcpy(buf, ", ", sizeof buf);
}
fprintf(stderr, "\n");
}
do {
fprintf(stderr, "Specify next volume #: ");
(void)fflush(stderr);
if (fgets(buf, sizeof buf, terminal) == NULL)
exit(1);
buf[strcspn(buf, "\n")] = '\0';
newvol = strtonum(buf, 1, INT_MAX, &errstr);
if (errstr)
fprintf(stderr, "Volume number %s: %s\n", errstr, buf);
} while (errstr);
}
if (newvol == volno) {
tapesread |= 1 << volno;
return;
}
closemt();
fprintf(stderr, "Mount tape volume %ld\n", newvol);
fprintf(stderr, "Enter ``none'' if there are no more tapes\n");
fprintf(stderr, "otherwise enter tape name (default: %s) ", magtape);
(void)fflush(stderr);
if (fgets(buf, sizeof buf, terminal) == NULL || feof(terminal))
exit(1);
buf[strcspn(buf, "\n")] = '\0';
if (strcmp(buf, "none") == 0) {
terminateinput();
return;
}
if (buf[0] != '\0')
(void)strlcpy(magtape, buf, sizeof magtape);
#ifdef RRESTORE
if (host)
mt = rmtopen(magtape, 0);
else
#endif
mt = open(magtape, O_RDONLY);
if (mt == -1) {
fprintf(stderr, "Cannot open %s\n", magtape);
volno = -1;
goto again;
}
gethdr:
volno = newvol;
setdumpnum();
FLUSHTAPEBUF();
if (gethead(&tmpbuf) == FAIL) {
Dprintf(stdout, "header read failed at %ld blocks\n", blksread);
fprintf(stderr, "tape is not dump tape\n");
volno = 0;
goto again;
}
if (tmpbuf.c_volume != volno) {
fprintf(stderr, "Wrong volume (%d)\n", tmpbuf.c_volume);
volno = 0;
goto again;
}
if (tmpbuf.c_date != dumpdate || tmpbuf.c_ddate != dumptime) {
time_t t = (time_t)tmpbuf.c_date;
fprintf(stderr, "Wrong dump date\n\tgot: %s", ctime(&t));
fprintf(stderr, "\twanted: %s", ctime(&dumpdate));
volno = 0;
goto again;
}
tapesread |= 1 << volno;
blksread = savecnt;
/*
* If continuing from the previous volume, skip over any
* blocks read already at the end of the previous volume.
*
* If coming to this volume at random, skip to the beginning
* of the next record.
*/
Dprintf(stdout, "read %ld recs, tape starts with %lld\n",
tpblksread, tmpbuf.c_firstrec);
if (tmpbuf.c_type == TS_TAPE && (tmpbuf.c_flags & DR_NEWHEADER)) {
if (!wantnext) {
tpblksread = tmpbuf.c_firstrec;
for (i = tmpbuf.c_count; i > 0; i--)
readtape(buf);
} else if (tmpbuf.c_firstrec > 0 &&
tmpbuf.c_firstrec < tpblksread - 1) {
/*
* -1 since we've read the volume header
*/
i = tpblksread - tmpbuf.c_firstrec - 1;
Dprintf(stderr, "Skipping %ld duplicate record%s.\n",
i, (i == 1) ? "" : "s");
while (--i >= 0)
readtape(buf);
}
}
if (curfile.action == USING) {
if (volno == 1)
panic("active file into volume 1\n");
return;
}
/*
* Skip up to the beginning of the next record
*/
if (tmpbuf.c_type == TS_TAPE && (tmpbuf.c_flags & DR_NEWHEADER))
for (i = tmpbuf.c_count; i > 0; i--)
readtape(buf);
(void)gethead(&spcl);
findinode(&spcl);
if (gettingfile) {
gettingfile = 0;
longjmp(restart, 1);
}
}
/*
* Handle unexpected EOF.
*/
static void
terminateinput(void)
{
if (gettingfile && curfile.action == USING) {
printf("Warning: %s %s\n",
"End-of-input encountered while extracting", curfile.name);
}
curfile.name = "<name unknown>";
curfile.action = UNKNOWN;
curfile.mode = 0;
curfile.ino = maxino;
if (gettingfile) {
gettingfile = 0;
longjmp(restart, 1);
}
}
/*
* handle multiple dumps per tape by skipping forward to the
* appropriate one.
*/
static void
setdumpnum(void)
{
struct mtop tcom;
if (dumpnum == 1 || volno != 1)
return;
if (pipein)
errx(1, "Cannot have multiple dumps on pipe input");
tcom.mt_op = MTFSF;
tcom.mt_count = dumpnum - 1;
#ifdef RRESTORE
if (host)
rmtioctl(MTFSF, dumpnum - 1);
else
#endif
if (ioctl(mt, MTIOCTOP, (char *)&tcom) < 0)
warn("ioctl MTFSF");
}
void
printdumpinfo(void)
{
time_t t;
t = (time_t)spcl.c_date;
fprintf(stdout, "Dump date: %s", ctime(&t));
t = (time_t)spcl.c_ddate;
fprintf(stdout, "Dumped from: %s",
(spcl.c_ddate == 0) ? "the epoch\n" : ctime(&t));
if (spcl.c_host[0] == '\0')
return;
fprintf(stderr, "Level %d dump of %s on %s:%s\n",
spcl.c_level, spcl.c_filesys, spcl.c_host, spcl.c_dev);
fprintf(stderr, "Label: %s\n", spcl.c_label);
}
int
extractfile(char *name)
{
u_int flags;
uid_t uid;
gid_t gid;
mode_t mode;
struct timeval mtimep[2], ctimep[2];
struct entry *ep;
int setbirth;
curfile.name = name;
curfile.action = USING;
mtimep[0].tv_sec = curfile.atime_sec;
mtimep[0].tv_usec = curfile.atime_nsec / 1000;
mtimep[1].tv_sec = curfile.mtime_sec;
mtimep[1].tv_usec = curfile.mtime_nsec / 1000;
setbirth = curfile.birthtime_sec != 0;
if (setbirth) {
ctimep[0].tv_sec = curfile.atime_sec;
ctimep[0].tv_usec = curfile.atime_nsec / 1000;
ctimep[1].tv_sec = curfile.birthtime_sec;
ctimep[1].tv_usec = curfile.birthtime_nsec / 1000;
}
uid = curfile.uid;
gid = curfile.gid;
mode = curfile.mode;
flags = curfile.file_flags;
switch (mode & IFMT) {
default:
fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode);
skipfile();
return (FAIL);
case IFSOCK:
Vprintf(stdout, "skipped socket %s\n", name);
skipfile();
return (GOOD);
case IFDIR:
if (mflag) {
ep = lookupname(name);
if (ep == NULL || ep->e_flags & EXTRACT)
panic("unextracted directory %s\n", name);
skipfile();
return (GOOD);
}
Vprintf(stdout, "extract file %s\n", name);
return (genliteraldir(name, curfile.ino));
case IFLNK: {
lnkbuf[0] = '\0';
pathlen = 0;
getfile(xtrlnkfile, xtrlnkskip);
if (pathlen == 0) {
Vprintf(stdout,
"%s: zero length symbolic link (ignored)\n",
name);
return (GOOD);
}
if (linkit(lnkbuf, name, SYMLINK) == FAIL)
return (FAIL);
(void)lchown(name, uid, gid);
return (GOOD);
}
case IFCHR:
case IFBLK:
Vprintf(stdout, "extract special file %s\n", name);
if (Nflag) {
skipfile();
return (GOOD);
}
if (mknod(name, mode, (int)curfile.rdev) < 0) {
warn("%s: cannot create special file", name);
skipfile();
return (FAIL);
}
(void)chown(name, uid, gid);
(void)chmod(name, mode);
(void)chflags(name, flags);
skipfile();
if (setbirth)
(void)utimes(name, ctimep);
(void)utimes(name, mtimep);
return (GOOD);
case IFIFO:
Vprintf(stdout, "extract fifo %s\n", name);
if (Nflag) {
skipfile();
return (GOOD);
}
if (mkfifo(name, mode) < 0) {
warn("%s: cannot create fifo", name);
skipfile();
return (FAIL);
}
(void)chown(name, uid, gid);
(void)chmod(name, mode);
(void)chflags(name, flags);
skipfile();
if (setbirth)
(void)utimes(name, ctimep);
(void)utimes(name, mtimep);
return (GOOD);
case IFREG:
Vprintf(stdout, "extract file %s\n", name);
if (Nflag) {
skipfile();
return (GOOD);
}
if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC,
0666)) < 0) {
warn("%s: cannot create file", name);
skipfile();
return (FAIL);
}
(void)fchown(ofile, curfile.uid, curfile.gid);
(void)fchmod(ofile, mode);
(void)fchflags(ofile, flags);
getfile(xtrfile, xtrskip);
(void)close(ofile);
if (setbirth)
(void)utimes(name, ctimep);
(void)utimes(name, mtimep);
return (GOOD);
}
/* NOTREACHED */
}
/*
* skip over bit maps on the tape
*/
void
skipmaps(void)
{
while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI)
skipfile();
}
/*
* skip over a file on the tape
*/
void
skipfile(void)
{
curfile.action = SKIP;
getfile(xtrnull, xtrnull);
}
/*
* Extract a file from the tape.
* When an allocated block is found it is passed to the fill function;
* when an unallocated block (hole) is found, a zeroed buffer is passed
* to the skip function.
*
* For some block types (TS_BITS, TS_CLRI), the c_addr map is not meaningful
* and no blocks should be skipped.
*/
void
getfile(void (*fill)(char *, size_t), void (*skip)(char *, size_t))
{
int i;
volatile int curblk = 0;
volatile off_t size = spcl.c_size;
static char clearedbuf[MAXBSIZE];
char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE];
char junk[TP_BSIZE];
volatile int noskip = (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI);
if (spcl.c_type == TS_END)
panic("ran off end of tape\n");
if (spcl.c_magic != FS_UFS2_MAGIC)
panic("not at beginning of a file\n");
if (!gettingfile && setjmp(restart) != 0)
return;
gettingfile++;
loop:
for (i = 0; i < spcl.c_count; i++) {
if (noskip || spcl.c_addr[i]) {
readtape(&buf[curblk++][0]);
if (curblk == fssize / TP_BSIZE) {
(*fill)((char *)buf, size > TP_BSIZE ?
fssize :
((off_t)curblk - 1) * TP_BSIZE + size);
curblk = 0;
}
} else {
if (curblk > 0) {
(*fill)((char *)buf, size > TP_BSIZE ?
(curblk * TP_BSIZE) :
((off_t)curblk - 1) * TP_BSIZE + size);
curblk = 0;
}
(*skip)(clearedbuf, size > TP_BSIZE ?
TP_BSIZE : size);
}
if ((size -= TP_BSIZE) <= 0) {
for (i++; i < spcl.c_count; i++)
if (noskip || spcl.c_addr[i])
readtape(junk);
break;
}
}
if (gethead(&spcl) == GOOD && size > 0) {
if (spcl.c_type == TS_ADDR)
goto loop;
Dprintf(stdout,
"Missing address (header) block for %s at %ld blocks\n",
curfile.name, blksread);
}
if (curblk > 0)
(*fill)((char *)buf, ((off_t)curblk * TP_BSIZE) + size);
findinode(&spcl);
gettingfile = 0;
}
/*
* Write out the next block of a file.
*/
static void
xtrfile(char *buf, size_t size)
{
if (Nflag)
return;
if (write(ofile, buf, size) == -1)
err(1, "write error extracting inode %d, name %s\nwrite",
curfile.ino, curfile.name);
}
/*
* Skip over a hole in a file.
*/
/* ARGSUSED */
static void
xtrskip(char *buf, size_t size)
{
if (lseek(ofile, (off_t)size, SEEK_CUR) == -1)
err(1, "seek error extracting inode %d, name %s\nlseek",
curfile.ino, curfile.name);
}
/*
* Collect the next block of a symbolic link.
*/
static void
xtrlnkfile(char *buf, size_t size)
{
pathlen += size;
if (pathlen > MAXPATHLEN)
errx(1, "symbolic link name: %s->%s%s; too long %lu",
curfile.name, lnkbuf, buf, (u_long)pathlen);
(void)strlcat(lnkbuf, buf, sizeof(lnkbuf));
}
/*
* Skip over a hole in a symbolic link (should never happen).
*/
/* ARGSUSED */
static void
xtrlnkskip(char *buf, size_t size)
{
errx(1, "unallocated block in symbolic link %s", curfile.name);
}
/*
* Collect the next block of a bit map.
*/
static void
xtrmap(char *buf, size_t size)
{
memcpy(map, buf, size);
map += size;
}
/*
* Skip over a hole in a bit map (should never happen).
*/
/* ARGSUSED */
static void
xtrmapskip(char *buf, size_t size)
{
panic("hole in map\n");
map += size;
}
/*
* Noop, when an extraction function is not needed.
*/
/* ARGSUSED */
void
xtrnull(char *buf, size_t size)
{
return;
}
/*
* Read TP_BSIZE blocks from the input.
* Handle read errors, and end of media.
*/
static void
readtape(char *buf)
{
long rd, newvol, i;
int cnt, seek_failed;
if (blkcnt < numtrec) {
memcpy(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE);
blksread++;
tpblksread++;
return;
}
for (i = 0; i < ntrec; i++)
((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
if (numtrec == 0)
numtrec = ntrec;
cnt = ntrec * TP_BSIZE;
rd = 0;
getmore:
#ifdef RRESTORE
if (host)
i = rmtread(&tapebuf[rd], cnt);
else
#endif
i = read(mt, &tapebuf[rd], cnt);
/*
* Check for mid-tape short read error.
* If found, skip rest of buffer and start with the next.
*/
if (!pipein && numtrec < ntrec && i > 0) {
Dprintf(stdout, "mid-media short read error.\n");
numtrec = ntrec;
}
/*
* Handle partial block read.
*/
if (pipein && i == 0 && rd > 0)
i = rd;
else if (i > 0 && i != ntrec * TP_BSIZE) {
if (pipein) {
rd += i;
cnt -= i;
if (cnt > 0)
goto getmore;
i = rd;
} else {
/*
* Short read. Process the blocks read.
*/
if (i % TP_BSIZE != 0)
Vprintf(stdout,
"partial block read: %ld should be %ld\n",
i, ntrec * TP_BSIZE);
numtrec = i / TP_BSIZE;
}
}
/*
* Handle read error.
*/
if (i < 0) {
fprintf(stderr, "Tape read error while ");
switch (curfile.action) {
default:
fprintf(stderr, "trying to set up tape\n");
break;
case UNKNOWN:
fprintf(stderr, "trying to resynchronize\n");
break;
case USING:
fprintf(stderr, "restoring %s\n", curfile.name);
break;
case SKIP:
fprintf(stderr, "skipping over inode %d\n",
curfile.ino);
break;
}
if (!yflag && !reply("continue"))
exit(1);
i = ntrec * TP_BSIZE;
memset(tapebuf, 0, i);
#ifdef RRESTORE
if (host)
seek_failed = (rmtseek(i, 1) < 0);
else
#endif
seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1);
if (seek_failed)
err(1, "continuation failed");
}
/*
* Handle end of tape.
*/
if (i == 0) {
Vprintf(stdout, "End-of-tape encountered\n");
if (!pipein) {
newvol = volno + 1;
volno = 0;
numtrec = 0;
getvol(newvol);
readtape(buf);
return;
}
if (rd % TP_BSIZE != 0)
panic("partial block read: %d should be %d\n",
rd, ntrec * TP_BSIZE);
terminateinput();
memcpy(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE);
}
blkcnt = 0;
memcpy(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE);
blksread++;
tpblksread++;
}
static void
findtapeblksize(void)
{
long i;
for (i = 0; i < ntrec; i++)
((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
blkcnt = 0;
#ifdef RRESTORE
if (host)
i = rmtread(tapebuf, ntrec * TP_BSIZE);
else
#endif
i = read(mt, tapebuf, ntrec * TP_BSIZE);
if (i <= 0)
err(1, "tape read error");
if (i % TP_BSIZE != 0) {
errx(1,
"Tape block size (%ld) is not a multiple of dump block size (%d)",
i, TP_BSIZE);
}
ntrec = i / TP_BSIZE;
numtrec = ntrec;
Vprintf(stdout, "Tape block size is %ld\n", ntrec);
}
void
closemt(void)
{
if (mt < 0)
return;
#ifdef RRESTORE
if (host)
rmtclose();
else
#endif
(void)close(mt);
}
/*
* Read the next block from the tape.
* Check to see if it is one of several vintage headers.
* If it is an old style header, convert it to a new style header.
* If it is not any valid header, return an error.
*/
static int
gethead(struct s_spcl *buf)
{
union u_ospcl u_ospcl;
if (!cvtflag) {
readtape((char *)buf);
if (buf->c_magic != NFS_MAGIC &&
buf->c_magic != FS_UFS2_MAGIC) {
if (swap32(buf->c_magic) != NFS_MAGIC &&
swap32(buf->c_magic) != FS_UFS2_MAGIC)
return (FAIL);
if (!Bcvt) {
Vprintf(stdout, "Note: Doing Byte swapping\n");
Bcvt = 1;
}
}
if (checksum((int *)buf) == FAIL)
return (FAIL);
if (Bcvt)
swap_header(buf);
goto good;
}
readtape((char *)(&u_ospcl.s_ospcl));
if (checksum((int *)(&u_ospcl.s_ospcl)) == FAIL)
return (FAIL);
if (u_ospcl.s_ospcl.c_magic != OFS_MAGIC) {
if (swap32(u_ospcl.s_ospcl.c_magic) != OFS_MAGIC)
return (FAIL);
if (!Bcvt) {
fprintf(stdout, "Note: Doing Byte swapping\n");
Bcvt = 1;
}
swap_old_header(&u_ospcl.s_ospcl);
}
memset(buf, 0, (long)TP_BSIZE);
buf->c_type = u_ospcl.s_ospcl.c_type;
buf->c_date = u_ospcl.s_ospcl.c_date;
buf->c_ddate = u_ospcl.s_ospcl.c_ddate;
buf->c_volume = u_ospcl.s_ospcl.c_volume;
buf->c_tapea = u_ospcl.s_ospcl.c_tapea;
buf->c_inumber = u_ospcl.s_ospcl.c_inumber;
buf->c_checksum = u_ospcl.s_ospcl.c_checksum;
buf->c_mode = u_ospcl.s_ospcl.c_odinode.odi_mode;
buf->c_uid = u_ospcl.s_ospcl.c_odinode.odi_uid;
buf->c_gid = u_ospcl.s_ospcl.c_odinode.odi_gid;
buf->c_size = u_ospcl.s_ospcl.c_odinode.odi_size;
buf->c_rdev = u_ospcl.s_ospcl.c_odinode.odi_rdev;
buf->c_atime = u_ospcl.s_ospcl.c_odinode.odi_atime;
buf->c_mtime = u_ospcl.s_ospcl.c_odinode.odi_mtime;
buf->c_count = u_ospcl.s_ospcl.c_count;
memcpy(buf->c_addr, u_ospcl.s_ospcl.c_addr, (long)256);
buf->c_magic = FS_UFS2_MAGIC;
good:
switch (buf->c_type) {
case TS_CLRI:
case TS_BITS:
/*
* Have to patch up missing information in bit map headers
*/
buf->c_inumber = 0;
buf->c_size = buf->c_count * TP_BSIZE;
break;
case TS_TAPE:
if ((buf->c_flags & DR_NEWINODEFMT) == 0)
oldinofmt = 1;
/* fall through */
case TS_END:
buf->c_inumber = 0;
break;
case TS_INODE:
if (buf->c_magic == NFS_MAGIC) {
buf->c_tapea = buf->c_old_tapea;
buf->c_firstrec = buf->c_old_firstrec;
buf->c_date = buf->c_old_date;
buf->c_ddate = buf->c_old_ddate;
buf->c_atime = buf->c_old_atime;
buf->c_mtime = buf->c_old_mtime;
buf->c_birthtime = 0;
buf->c_birthtimensec = 0;
buf->c_atimensec = buf->c_mtimensec = 0;
}
case TS_ADDR:
break;
default:
panic("gethead: unknown inode type %d\n", buf->c_type);
break;
}
buf->c_magic = FS_UFS2_MAGIC;
/*
* If we are restoring a filesystem with old format inodes,
* copy the uid/gid to the new location.
*/
if (oldinofmt) {
buf->c_uid = buf->c_spare1[1];
buf->c_gid = buf->c_spare1[2];
}
if (dflag)
accthdr(buf);
return(GOOD);
}
/*
* Check that a header is where it belongs and predict the next header
*/
static void
accthdr(struct s_spcl *header)
{
static ino_t previno = 0x7fffffff;
static int prevtype;
static long predict;
long blks, i;
if (header->c_type == TS_TAPE) {
fprintf(stderr, "Volume header (%s inode format) ",
oldinofmt ? "old" : "new");
if (header->c_firstrec)
fprintf(stderr, "begins with record %lld",
(long long)header->c_firstrec);
fprintf(stderr, "\n");
previno = 0x7fffffff;
return;
}
if (previno == 0x7fffffff)
goto newcalc;
switch (prevtype) {
case TS_BITS:
fprintf(stderr, "Dumped inodes map header");
break;
case TS_CLRI:
fprintf(stderr, "Used inodes map header");
break;
case TS_INODE:
fprintf(stderr, "File header, ino %d", previno);
break;
case TS_ADDR:
fprintf(stderr, "File continuation header, ino %d", previno);
break;
case TS_END:
fprintf(stderr, "End of tape header");
break;
}
if (predict != blksread - 1)
fprintf(stderr, "; predicted %ld blocks, got %ld blocks",
predict, blksread - 1);
fprintf(stderr, "\n");
newcalc:
blks = 0;
switch (header->c_type) {
case TS_BITS:
case TS_CLRI:
blks = header->c_count;
break;
case TS_END:
break;
default:
for (i = 0; i < header->c_count; i++)
if (header->c_addr[i] != 0)
blks++;
}
predict = blks;
blksread = 0;
prevtype = header->c_type;
previno = header->c_inumber;
}
/*
* Find an inode header.
* Complain if had to skip, and complain is set.
*/
static void
findinode(struct s_spcl *header)
{
static long skipcnt = 0;
long i;
char buf[TP_BSIZE];
curfile.name = "<name unknown>";
curfile.action = UNKNOWN;
curfile.mode = 0;
curfile.ino = 0;
do {
if (header->c_magic != FS_UFS2_MAGIC) {
skipcnt++;
while (gethead(header) == FAIL ||
header->c_date != dumpdate)
skipcnt++;
}
switch (header->c_type) {
case TS_ADDR:
/*
* Skip up to the beginning of the next record
*/
for (i = 0; i < header->c_count; i++)
if (header->c_addr[i])
readtape(buf);
while (gethead(header) == FAIL ||
header->c_date != dumpdate)
skipcnt++;
break;
case TS_INODE:
curfile.mode = header->c_mode;
curfile.uid = header->c_uid;
curfile.gid = header->c_gid;
curfile.file_flags = header->c_file_flags;
curfile.rdev = header->c_rdev;
curfile.atime_sec = header->c_atime;
curfile.atime_nsec = header->c_atimensec;
curfile.mtime_sec = header->c_mtime;
curfile.mtime_nsec = header->c_mtimensec;
curfile.birthtime_sec = header->c_birthtime;
curfile.birthtime_nsec = header->c_birthtimensec;
curfile.size = header->c_size;
curfile.ino = header->c_inumber;
break;
case TS_END:
curfile.ino = maxino;
break;
case TS_CLRI:
curfile.name = "<file removal list>";
break;
case TS_BITS:
curfile.name = "<file dump list>";
break;
case TS_TAPE:
panic("unexpected tape header\n");
/* NOTREACHED */
default:
panic("unknown tape header type %d\n", spcl.c_type);
/* NOTREACHED */
}
} while (header->c_type == TS_ADDR);
if (skipcnt > 0)
fprintf(stderr, "resync restore, skipped %ld blocks\n", skipcnt);
skipcnt = 0;
}
static int
checksum(int *buf)
{
int i, j;
j = sizeof(union u_spcl) / sizeof(int);
i = 0;
if (!Bcvt) {
do
i += *buf++;
while (--j);
} else {
do
i += swap32(*buf++);
while (--j);
}
if (i != CHECKSUM) {
fprintf(stderr, "Checksum error %o, inode %d file %s\n", i,
curfile.ino, curfile.name);
return(FAIL);
}
return(GOOD);
}
#ifdef RRESTORE
#include <stdarg.h>
void
msg(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
}
#endif /* RRESTORE */
static void
swap_header(struct s_spcl *s)
{
s->c_type = swap32(s->c_type);
s->c_old_date = swap32(s->c_old_date);
s->c_old_ddate = swap32(s->c_old_ddate);
s->c_volume = swap32(s->c_volume);
s->c_old_tapea = swap32(s->c_old_tapea);
s->c_inumber = swap32(s->c_inumber);
s->c_magic = swap32(s->c_magic);
s->c_checksum = swap32(s->c_checksum);
s->c_mode = swap16(s->c_mode);
s->c_size = swap64(s->c_size);
s->c_old_atime = swap32(s->c_old_atime);
s->c_atimensec = swap32(s->c_atimensec);
s->c_old_mtime = swap32(s->c_old_mtime);
s->c_mtimensec = swap32(s->c_mtimensec);
s->c_rdev = swap32(s->c_rdev);
s->c_birthtimensec = swap32(s->c_birthtimensec);
s->c_birthtime = swap64(s->c_birthtime);
s->c_atime = swap64(s->c_atime);
s->c_mtime = swap64(s->c_mtime);
s->c_file_flags = swap32(s->c_file_flags);
s->c_uid = swap32(s->c_uid);
s->c_gid = swap32(s->c_gid);
s->c_count = swap32(s->c_count);
s->c_level = swap32(s->c_level);
s->c_flags = swap32(s->c_flags);
s->c_old_firstrec = swap32(s->c_old_firstrec);
s->c_date = swap64(s->c_date);
s->c_ddate = swap64(s->c_ddate);
s->c_tapea = swap64(s->c_tapea);
s->c_firstrec = swap64(s->c_firstrec);
/*
* These are ouid and ogid.
*/
s->c_spare1[1] = swap16(s->c_spare1[1]);
s->c_spare1[2] = swap16(s->c_spare1[2]);
}
static void
swap_old_header(struct s_ospcl *os)
{
os->c_type = swap32(os->c_type);
os->c_date = swap32(os->c_date);
os->c_ddate = swap32(os->c_ddate);
os->c_volume = swap32(os->c_volume);
os->c_tapea = swap32(os->c_tapea);
os->c_inumber = swap16(os->c_inumber);
os->c_magic = swap32(os->c_magic);
os->c_checksum = swap32(os->c_checksum);
os->c_odinode.odi_mode = swap16(os->c_odinode.odi_mode);
os->c_odinode.odi_nlink = swap16(os->c_odinode.odi_nlink);
os->c_odinode.odi_uid = swap16(os->c_odinode.odi_uid);
os->c_odinode.odi_gid = swap16(os->c_odinode.odi_gid);
os->c_odinode.odi_size = swap32(os->c_odinode.odi_size);
os->c_odinode.odi_rdev = swap32(os->c_odinode.odi_rdev);
os->c_odinode.odi_atime = swap32(os->c_odinode.odi_atime);
os->c_odinode.odi_mtime = swap32(os->c_odinode.odi_mtime);
os->c_odinode.odi_ctime = swap32(os->c_odinode.odi_ctime);
os->c_count = swap32(os->c_count);
}