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NetBSD/sbin/restore/tape.c
joerg baa8e84b6f Use __dead
2011-08-29 14:34:58 +00:00

1559 lines
36 KiB
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/* $NetBSD: tape.c,v 1.66 2011/08/29 14:35:03 joerg 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)tape.c 8.9 (Berkeley) 5/1/95";
#else
__RCSID("$NetBSD: tape.c,v 1.66 2011/08/29 14:35:03 joerg Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <sys/stat.h>
#include <ufs/ufs/dinode.h>
#include <protocols/dumprestore.h>
#include <err.h>
#include <errno.h>
#include <paths.h>
#include <setjmp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <md5.h>
#include <rmd160.h>
#include <sha1.h>
#include "restore.h"
#include "extern.h"
static u_int32_t 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 int blksread; /* blocks read since last header */
static int tpblksread = 0; /* TP_BSIZE blocks read */
static int tapesread;
static jmp_buf restart;
static int gettingfile = 0; /* restart has a valid frame */
#ifdef RRESTORE
static const char *host = NULL;
#endif
static int ofile;
static char lnkbuf[MAXPATHLEN + 1];
static int pathlen;
int oldinofmt; /* old inode format conversion required */
int Bcvt; /* Swap Bytes (for CCI or sun) */
const struct digest_desc *ddesc;
static union digest_context {
MD5_CTX dc_MD5;
SHA1_CTX dc_SHA1;
RMD160_CTX dc_RMD160;
} dcontext;
/*
* 32 for md5; 40 for sha1 and rmd160
* plus a null terminator.
*/
#define DIGEST_BUFFER_SIZE (40 + 1)
#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 void getbitmap(char **);
static int gethead(struct s_spcl *);
static void readtape(char *);
static void setdumpnum(void);
static void terminateinput(void);
static void xtrfile(char *, long);
static void xtrlnkfile(char *, long);
__dead static void xtrlnkskip(char *, long);
static void xtrskip(char *, long);
static void swap_header(struct s_spcl *);
static void swap_old_header(struct s_ospcl *);
////////////////////////////////////////////////////////////
// thunks for type correctness
#define WRAP(alg) \
static void \
do_##alg##Init(void *ctx) \
{ \
alg##Init(ctx); \
} \
\
static void \
do_##alg##Update(union digest_context *ctx, \
const void *buf, unsigned len) \
{ \
alg##Update(&ctx->dc_##alg, buf, len); \
} \
\
static char * \
do_##alg##End(void *ctx, char *str) \
{ \
return alg##End(ctx, str); \
}
WRAP(MD5);
WRAP(SHA1);
WRAP(RMD160);
static const struct digest_desc digest_descs[] = {
{ "MD5",
do_MD5Init,
do_MD5Update,
do_MD5End, },
{ "SHA1",
do_SHA1Init,
do_SHA1Update,
do_SHA1End, },
{ "RMD160",
do_RMD160Init,
do_RMD160Update,
do_RMD160End, },
{ .dd_name = NULL },
};
////////////////////////////////////////////////////////////
const struct digest_desc *
digest_lookup(const char *name)
{
const struct digest_desc *dd;
for (dd = digest_descs; dd->dd_name != NULL; dd++)
if (strcasecmp(dd->dd_name, name) == 0)
return (dd);
return (NULL);
}
/*
* Set up an input source
*/
void
setinput(const char *source)
{
char *cp;
FLUSHTAPEBUF();
if (bflag)
newtapebuf(ntrec);
else
newtapebuf(NTREC > HIGHDENSITYTREC ? NTREC : HIGHDENSITYTREC);
terminal = stdin;
#ifdef RRESTORE
if ((cp = strchr(source, ':')) != NULL) {
host = source;
/* Ok, because const strings don't have : */
*cp++ = '\0';
source = cp;
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) {
(void)fprintf(stderr, "cannot open %s: %s\n",
_PATH_TTY, strerror(errno));
terminal = fopen(_PATH_DEVNULL, "r");
if (terminal == NULL) {
(void)fprintf(stderr, "cannot open %s: %s\n",
_PATH_DEVNULL, strerror(errno));
exit(1);
}
}
pipein++;
}
(void) strcpy(magtape, source);
}
void
newtapebuf(long size)
{
static int tapebufsize = -1;
ntrec = size;
if (size <= tapebufsize)
return;
if (tapebuf != NULL)
free(tapebuf);
tapebuf = malloc(size * TP_BSIZE);
if (tapebuf == NULL) {
fprintf(stderr, "Cannot allocate space for tape buffer\n");
exit(1);
}
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, 0);
else
#endif
if (pipein)
mt = 0;
else
mt = open(magtape, O_RDONLY, 0);
if (mt < 0) {
fprintf(stderr, "%s: %s\n", magtape, strerror(errno));
exit(1);
}
volno = 1;
setdumpnum();
FLUSHTAPEBUF();
if (!pipein && !bflag)
findtapeblksize();
if (gethead(&spcl) == FAIL) {
blkcnt--; /* push back this block */
blksread--;
tpblksread--;
cvtflag++;
if (gethead(&spcl) == FAIL) {
fprintf(stderr, "Tape is not a dump tape\n");
exit(1);
}
fprintf(stderr, "Converting to new file system format.\n");
}
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 = spcl.c_ddate;
dumpdate = spcl.c_date;
if (stat(".", &stbuf) < 0) {
fprintf(stderr, "cannot stat .: %s\n", strerror(errno));
exit(1);
}
if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE)
fssize = stbuf.st_blksize;
if (((fssize - 1) & fssize) != 0) {
fprintf(stderr, "bad block size %d\n", fssize);
exit(1);
}
if (spcl.c_volume != 1) {
fprintf(stderr, "Tape is not volume 1 of the dump\n");
exit(1);
}
if (gethead(&spcl) == FAIL) {
dprintf(stdout, "header read failed at %d blocks\n", blksread);
panic("no header after volume mark!\n");
}
findinode(&spcl);
if (spcl.c_type != TS_CLRI) {
fprintf(stderr, "Cannot find file removal list\n");
exit(1);
}
getbitmap(&usedinomap);
getbitmap(&dumpmap);
/*
* If there may be whiteout entries on the tape, pretend that the
* whiteout inode exists, so that the whiteout entries can be
* extracted.
*/
if (oldinofmt == 0)
SETINO(WINO, dumpmap);
}
/*
* 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(int nextvol)
{
int newvol, savecnt, wantnext, i;
union u_spcl tmpspcl;
# define tmpbuf tmpspcl.s_spcl
char buf[TP_BSIZE];
newvol = savecnt = wantnext = 0;
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");
fprintf(stderr,
"(Use 1 for the first volume/tape, etc.)\n");
} else {
fprintf(stderr, "You have read volumes");
strcpy(buf, ": ");
for (i = 1; i < 32; i++)
if (tapesread & (1 << i)) {
fprintf(stderr, "%s%d", buf, i);
strcpy(buf, ", ");
}
fprintf(stderr, "\n");
}
do {
fprintf(stderr, "Specify next volume #: ");
(void) fflush(stderr);
(void) fgets(buf, BUFSIZ, terminal);
} while (!feof(terminal) && buf[0] == '\n');
if (feof(terminal))
exit(1);
newvol = atoi(buf);
if (newvol <= 0) {
fprintf(stderr,
"Volume numbers are positive numerics\n");
}
}
if (newvol == volno) {
tapesread |= 1 << volno;
return;
}
closemt();
fprintf(stderr, "Mount tape volume %d\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);
(void) fgets(buf, BUFSIZ, terminal);
if (feof(terminal))
exit(1);
if (!strcmp(buf, "none\n")) {
terminateinput();
return;
}
if (buf[0] != '\n') {
(void) strcpy(magtape, buf);
magtape[strlen(magtape) - 1] = '\0';
}
#ifdef RRESTORE
if (host)
mt = rmtopen(magtape, 0, 0);
else
#endif
mt = open(magtape, O_RDONLY, 0);
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 %d blocks\n", blksread);
fprintf(stderr, "tape is not dump tape\n");
volno = 0;
goto again;
}
if (tmpbuf.c_volume != volno) {
fprintf(stderr,
"Volume mismatch: expecting %d, tape header claims it is %d\n",
volno, tmpbuf.c_volume);
volno = 0;
goto again;
}
if (tmpbuf.c_date != dumpdate || tmpbuf.c_ddate != dumptime) {
time_t ttime = tmpbuf.c_date;
fprintf(stderr, "Wrong dump date\n\tgot: %s",
ctime(&ttime));
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 %ld\n",
(long)tpblksread, (long)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 %d 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) {
fprintf(stderr, "Cannot have multiple dumps on pipe input\n");
exit(1);
}
tcom.mt_op = MTFSF;
tcom.mt_count = dumpnum - 1;
#ifdef RRESTORE
if (host)
rmtioctl(MTFSF, dumpnum - 1);
else
#endif
if (ioctl(mt, (int)MTIOCTOP, (char *)&tcom) < 0)
fprintf(stderr, "ioctl MTFSF: %s\n", strerror(errno));
}
void
printdumpinfo(void)
{
time_t ttime;
ttime = spcl.c_date;
fprintf(stdout, "Dump date: %s", ctime(&ttime));
ttime = spcl.c_ddate;
fprintf(stdout, "Dumped from: %s",
(spcl.c_ddate == 0) ? "the epoch\n" : ctime(&ttime));
fprintf(stderr, "Level %d dump of %s on %s:%s\n",
spcl.c_level, spcl.c_filesys,
*spcl.c_host? spcl.c_host: "[unknown]", spcl.c_dev);
fprintf(stderr, "Label: %s\n", spcl.c_label);
if (Mtreefile) {
ttime = spcl.c_date;
fprintf(Mtreefile, "#Dump date: %s", ctime(&ttime));
ttime = spcl.c_ddate;
fprintf(Mtreefile, "#Dumped from: %s",
(spcl.c_ddate == 0) ? "the epoch\n" : ctime(&ttime));
fprintf(Mtreefile, "#Level %d dump of %s on %s:%s\n",
spcl.c_level, spcl.c_filesys,
*spcl.c_host? spcl.c_host: "[unknown]", spcl.c_dev);
fprintf(Mtreefile, "#Label: %s\n", spcl.c_label);
fprintf(Mtreefile, "/set uname=root gname=wheel\n");
if (ferror(Mtreefile))
err(1, "error writing to mtree file");
}
}
int
extractfile(char *name)
{
char dbuffer[DIGEST_BUFFER_SIZE];
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 (uflag)
(void) unlink(name);
if (linkit(lnkbuf, name, SYMLINK) == GOOD) {
if (setbirth)
(void) lutimes(name, ctimep);
(void) lutimes(name, mtimep);
(void) lchown(name, uid, gid);
(void) lchmod(name, mode);
if (Mtreefile) {
writemtree(name, "link",
uid, gid, mode, flags);
} else
(void) lchflags(name, flags);
return (GOOD);
}
return (FAIL);
case IFCHR:
case IFBLK:
vprintf(stdout, "extract special file %s\n", name);
if (Nflag) {
skipfile();
return (GOOD);
}
if (uflag)
(void) unlink(name);
if (mknod(name, (mode & (IFCHR | IFBLK)) | 0600,
(int)curfile.rdev) < 0) {
fprintf(stderr, "%s: cannot create special file: %s\n",
name, strerror(errno));
skipfile();
return (FAIL);
}
skipfile();
if (setbirth)
(void) utimes(name, ctimep);
(void) utimes(name, mtimep);
(void) chown(name, uid, gid);
(void) chmod(name, mode);
if (Mtreefile) {
writemtree(name,
((mode & (S_IFBLK | IFCHR)) == IFBLK) ?
"block" : "char",
uid, gid, mode, flags);
} else
(void) chflags(name, flags);
return (GOOD);
case IFIFO:
vprintf(stdout, "extract fifo %s\n", name);
if (Nflag) {
skipfile();
return (GOOD);
}
if (uflag)
(void) unlink(name);
if (mkfifo(name, 0600) < 0) {
fprintf(stderr, "%s: cannot create fifo: %s\n",
name, strerror(errno));
skipfile();
return (FAIL);
}
skipfile();
if (setbirth)
(void) utimes(name, ctimep);
(void) utimes(name, mtimep);
(void) chown(name, uid, gid);
(void) chmod(name, mode);
if (Mtreefile) {
writemtree(name, "fifo",
uid, gid, mode, flags);
} else
(void) chflags(name, flags);
return (GOOD);
case IFREG:
vprintf(stdout, "extract file %s\n", name);
if (uflag)
(void) unlink(name);
if (!Nflag && (ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC,
0600)) < 0) {
fprintf(stderr, "%s: cannot create file: %s\n",
name, strerror(errno));
skipfile();
return (FAIL);
}
if (Dflag)
(*ddesc->dd_init)(&dcontext);
getfile(xtrfile, xtrskip);
if (Dflag) {
(*ddesc->dd_end)(&dcontext, dbuffer);
for (ep = lookupname(name); ep != NULL;
ep = ep->e_links)
fprintf(stdout, "%s (%s) = %s\n",
ddesc->dd_name, myname(ep),
dbuffer);
}
if (Nflag)
return (GOOD);
if (setbirth)
(void) futimes(ofile, ctimep);
(void) futimes(ofile, mtimep);
(void) fchown(ofile, uid, gid);
(void) fchmod(ofile, mode);
if (Mtreefile) {
writemtree(name, "file",
uid, gid, mode, flags);
} else
(void) fchflags(ofile, flags);
(void) close(ofile);
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 bitmap from the tape.
* The first bitmap sets maxino;
* other bitmaps must be of same size.
*/
void
getbitmap(char **map)
{
int i;
size_t volatile size = spcl.c_size;
size_t volatile mapsize = size;
char *mapptr;
curfile.action = USING;
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++;
mapptr = *map = malloc(size);
loop:
if (*map == NULL)
panic("no memory for %s\n", curfile.name);
for (i = 0; i < spcl.c_count && size >= TP_BSIZE; i++) {
readtape(mapptr);
mapptr += TP_BSIZE;
size -= TP_BSIZE;
}
if (size != 0 || i != spcl.c_count)
panic("%s: inconsistent map size\n", curfile.name);
if (gethead(&spcl) == GOOD && spcl.c_type == TS_ADDR) {
size = spcl.c_count * TP_BSIZE;
*map = realloc(*map, mapsize + size);
mapptr = *map + mapsize;
mapsize += size;
goto loop;
}
if (maxino == 0)
maxino = mapsize * NBBY + 1;
else if (maxino != mapsize * NBBY + 1)
panic("%s: map size changed\n", curfile.name);
findinode(&spcl);
gettingfile = 0;
}
/*
* 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.
*/
void
getfile(void (*fill)(char *buf, long size),
void (*skip)(char *buf, long size))
{
int i;
int volatile curblk;
quad_t volatile size;
static char clearedbuf[MAXBSIZE];
char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE];
char junk[TP_BSIZE];
curblk = 0;
size = spcl.c_size;
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 (spcl.c_addr[i]) {
readtape(&buf[curblk++][0]);
if ((uint32_t)curblk == fssize / TP_BSIZE) {
(*fill)((char *)buf, (long)(size > TP_BSIZE ?
fssize : (curblk - 1) * TP_BSIZE + size));
curblk = 0;
}
} else {
if (curblk > 0) {
(*fill)((char *)buf, (long)(size > TP_BSIZE ?
curblk * TP_BSIZE :
(curblk - 1) * TP_BSIZE + size));
curblk = 0;
}
(*skip)(clearedbuf, (long)(size > TP_BSIZE ?
TP_BSIZE : size));
}
if ((size -= TP_BSIZE) <= 0) {
for (i++; i < spcl.c_count; i++)
if (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 %d blocks\n",
curfile.name, blksread);
}
if (curblk > 0)
(*fill)((char *)buf, (long)((curblk * TP_BSIZE) + size));
/* Skip over Linux extended attributes. */
if (spcl.c_type == TS_INODE && (spcl.c_flags & DR_EXTATTRIBUTES)) {
for (i = 0; i < spcl.c_count; i++)
readtape(junk);
(void)gethead(&spcl);
}
findinode(&spcl);
gettingfile = 0;
}
/*
* Write out the next block of a file.
*/
static void
xtrfile(char *buf, long size)
{
if (Dflag)
(*ddesc->dd_update)(&dcontext, buf, size);
if (Nflag)
return;
if (write(ofile, buf, (int) size) == -1) {
fprintf(stderr,
"write error extracting inode %llu, name %s\nwrite: %s\n",
(unsigned long long)curfile.ino, curfile.name,
strerror(errno));
exit(1);
}
}
/*
* Skip over a hole in a file.
*/
/* ARGSUSED */
static void
xtrskip(char *buf, long size)
{
if (Dflag)
(*ddesc->dd_update)(&dcontext, buf, size);
if (Nflag)
return;
if (lseek(ofile, size, SEEK_CUR) == -1) {
fprintf(stderr,
"seek error extracting inode %llu, name %s\nlseek: %s\n",
(unsigned long long)curfile.ino, curfile.name,
strerror(errno));
exit(1);
}
}
/*
* Collect the next block of a symbolic link.
*/
static void
xtrlnkfile(char *buf, long size)
{
pathlen += size;
if (pathlen > MAXPATHLEN) {
fprintf(stderr, "symbolic link name: %s->%s%s; too long %d\n",
curfile.name, lnkbuf, buf, pathlen);
exit(1);
}
(void) strcat(lnkbuf, buf);
}
/*
* Skip over a hole in a symbolic link (should never happen).
*/
/* ARGSUSED */
static void
xtrlnkskip(char *buf __unused, long size __unused)
{
fprintf(stderr, "unallocated block in symbolic link %s\n",
curfile.name);
exit(1);
}
/*
* Noop, when an extraction function is not needed.
*/
/* ARGSUSED */
void
xtrnull(char *buf __unused, long size __unused)
{
return;
}
/*
* Read TP_BSIZE blocks from the input.
* Handle read errors, and end of media.
*/
static void
readtape(char *buf)
{
int rd, newvol, i;
int cnt, seek_failed;
if (blkcnt < numtrec) {
memmove(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: %d should be %d\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 %llu\n",
(unsigned long long)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) {
fprintf(stderr,
"continuation failed: %s\n", strerror(errno));
exit(1);
}
}
/*
* 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();
memmove(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE);
}
blkcnt = 0;
memmove(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) {
fprintf(stderr, "tape read error: %s\n", strerror(errno));
exit(1);
}
if (i % TP_BSIZE != 0) {
fprintf(stderr, "Tape block size (%ld) %s (%ld)\n",
(long)i, "is not a multiple of dump block size",
(long)TP_BSIZE);
exit(1);
}
ntrec = i / TP_BSIZE;
numtrec = ntrec;
vprintf(stdout, "Tape block size is %d\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 (bswap32(buf->c_magic) != NFS_MAGIC &&
bswap32(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 (bswap32(u_ospcl.s_ospcl.c_magic) != OFS_MAGIC)
return (FAIL);
if (!Bcvt) {
vprintf(stdout, "Note: Doing Byte swapping\n");
Bcvt = 1;
}
swap_old_header(&u_ospcl.s_ospcl);
}
memset(buf, 0, 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;
memmove(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 %llu",
(unsigned long long)previno);
break;
case TS_ADDR:
fprintf(stderr, "File continuation header, ino %llu",
(unsigned long long)previno);
break;
case TS_END:
fprintf(stderr, "End of tape header");
break;
}
if (predict != blksread - 1)
fprintf(stderr, "; predicted %ld blocks, got %ld blocks",
(long)predict, (long)(blksread - 1));
fprintf(stderr, "\n");
newcalc:
blks = 0;
switch (header->c_type) {
case TS_END:
break;
case TS_CLRI:
case TS_BITS:
blks = header->c_count;
break;
default:
for (i = 0; i < header->c_count; i++)
if (header->c_addr[i] != 0)
blks++;
break;
}
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;
top:
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++;
/* We've read a header; don't drop it. */
goto top;
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");
break;
default:
panic("unknown tape header type %d\n", spcl.c_type);
break;
}
} while (header->c_type == TS_ADDR);
if (skipcnt > 0)
fprintf(stderr, "resync restore, skipped %ld blocks\n",
(long)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 += bswap32(*buf++);
while (--j);
}
if (i != CHECKSUM) {
fprintf(stderr, "Checksum error %o, inode %llu file %s\n", i,
(unsigned long long)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 = bswap32(s->c_type);
s->c_old_date = bswap32(s->c_old_date);
s->c_old_ddate = bswap32(s->c_old_ddate);
s->c_volume = bswap32(s->c_volume);
s->c_old_tapea = bswap32(s->c_old_tapea);
s->c_inumber = bswap32(s->c_inumber);
s->c_magic = bswap32(s->c_magic);
s->c_checksum = bswap32(s->c_checksum);
s->c_mode = bswap16(s->c_mode);
s->c_size = bswap64(s->c_size);
s->c_old_atime = bswap32(s->c_old_atime);
s->c_atimensec = bswap32(s->c_atimensec);
s->c_old_mtime = bswap32(s->c_old_mtime);
s->c_mtimensec = bswap32(s->c_mtimensec);
s->c_rdev = bswap32(s->c_rdev);
s->c_birthtimensec = bswap32(s->c_birthtimensec);
s->c_birthtime = bswap64(s->c_birthtime);
s->c_atime = bswap64(s->c_atime);
s->c_mtime = bswap64(s->c_mtime);
s->c_file_flags = bswap32(s->c_file_flags);
s->c_uid = bswap32(s->c_uid);
s->c_gid = bswap32(s->c_gid);
s->c_count = bswap32(s->c_count);
s->c_level = bswap32(s->c_level);
s->c_flags = bswap32(s->c_flags);
s->c_old_firstrec = bswap32(s->c_old_firstrec);
s->c_date = bswap64(s->c_date);
s->c_ddate = bswap64(s->c_ddate);
s->c_tapea = bswap64(s->c_tapea);
s->c_firstrec = bswap64(s->c_firstrec);
/*
* These are ouid and ogid.
*/
s->c_spare1[1] = bswap16(s->c_spare1[1]);
s->c_spare1[2] = bswap16(s->c_spare1[2]);
}
static void
swap_old_header(struct s_ospcl *os)
{
os->c_type = bswap32(os->c_type);
os->c_date = bswap32(os->c_date);
os->c_ddate = bswap32(os->c_ddate);
os->c_volume = bswap32(os->c_volume);
os->c_tapea = bswap32(os->c_tapea);
os->c_inumber = bswap16(os->c_inumber);
os->c_magic = bswap32(os->c_magic);
os->c_checksum = bswap32(os->c_checksum);
os->c_odinode.odi_mode = bswap16(os->c_odinode.odi_mode);
os->c_odinode.odi_nlink = bswap16(os->c_odinode.odi_nlink);
os->c_odinode.odi_uid = bswap16(os->c_odinode.odi_uid);
os->c_odinode.odi_gid = bswap16(os->c_odinode.odi_gid);
os->c_odinode.odi_size = bswap32(os->c_odinode.odi_size);
os->c_odinode.odi_rdev = bswap32(os->c_odinode.odi_rdev);
os->c_odinode.odi_atime = bswap32(os->c_odinode.odi_atime);
os->c_odinode.odi_mtime = bswap32(os->c_odinode.odi_mtime);
os->c_odinode.odi_ctime = bswap32(os->c_odinode.odi_ctime);
os->c_count = bswap32(os->c_count);
}
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