Net2/usr/src/sbin/restore/tape.c
/*
* Copyright (c) 1983 The Regents of the University of California.
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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
static char sccsid[] = "@(#)tape.c 5.21 (Berkeley) 2/22/91";
#endif /* not lint */
#include "restore.h"
#include <protocols/dumprestore.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <sys/file.h>
#include <setjmp.h>
#include <sys/stat.h>
#include "pathnames.h"
static long fssize = MAXBSIZE;
static int mt = -1;
static int pipein = 0;
static char magtape[BUFSIZ];
static int bct;
static int numtrec;
static char *tbf;
static union u_spcl endoftapemark;
static long blksread;
static long tapesread;
static jmp_buf restart;
static int gettingfile = 0; /* restart has a valid frame */
static int ofile;
static char *map;
static char lnkbuf[MAXPATHLEN + 1];
static int pathlen;
int Bcvt; /* Swap Bytes (for CCI or sun) */
static int Qcvt; /* Swap quads (for sun) */
u_long swabl();
/*
* Set up an input source
*/
setinput(source)
char *source;
{
extern int errno;
#ifdef RRESTORE
char *host, *tape;
#endif RRESTORE
char *strerror();
flsht();
if (bflag)
newtapebuf(ntrec);
else
newtapebuf(NTREC > HIGHDENSITYTREC ? NTREC : HIGHDENSITYTREC);
terminal = stdin;
#ifdef RRESTORE
host = source;
tape = index(host, ':');
if (tape == 0) {
nohost:
msg("need keyletter ``f'' and device ``host:tape''\n");
done(1);
}
*tape++ = '\0';
(void) strcpy(magtape, tape);
if (rmthost(host) == 0)
done(1);
setuid(getuid()); /* no longer need or want root privileges */
#else
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));
done(1);
}
}
pipein++;
}
(void) strcpy(magtape, source);
#endif RRESTORE
}
newtapebuf(size)
long size;
{
static tbfsize = -1;
ntrec = size;
if (size <= tbfsize)
return;
if (tbf != NULL)
free(tbf);
tbf = (char *)malloc(size * TP_BSIZE);
if (tbf == NULL) {
fprintf(stderr, "Cannot allocate space for tape buffer\n");
done(1);
}
tbfsize = size;
}
/*
* Verify that the tape drive can be accessed and
* that it actually is a dump tape.
*/
setup()
{
int i, j, *ip;
struct stat stbuf;
extern int xtrmap(), xtrmapskip();
vprintf(stdout, "Verify tape and initialize maps\n");
#ifdef RRESTORE
if ((mt = rmtopen(magtape, 0)) < 0)
#else
if (pipein)
mt = 0;
else if ((mt = open(magtape, 0)) < 0)
#endif
{
perror(magtape);
done(1);
}
volno = 1;
setdumpnum();
flsht();
if (!pipein && !bflag)
findtapeblksize();
if (gethead(&spcl) == FAIL) {
bct--; /* push back this block */
cvtflag++;
if (gethead(&spcl) == FAIL) {
fprintf(stderr, "Tape is not a dump tape\n");
done(1);
}
fprintf(stderr, "Converting to new file system format.\n");
}
if (pipein) {
endoftapemark.s_spcl.c_magic = cvtflag ? OFS_MAGIC : NFS_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) {
perror("cannot stat .");
done(1);
}
if (stbuf.st_blksize > 0 && stbuf.st_blksize <= MAXBSIZE)
fssize = stbuf.st_blksize;
if (((fssize - 1) & fssize) != 0) {
fprintf(stderr, "bad block size %d\n", fssize);
done(1);
}
if (checkvol(&spcl, (long)1) == FAIL) {
fprintf(stderr, "Tape is not volume 1 of the dump\n");
done(1);
}
if (readhdr(&spcl) == FAIL)
panic("no header after volume mark!\n");
findinode(&spcl);
if (checktype(&spcl, TS_CLRI) == FAIL) {
fprintf(stderr, "Cannot find file removal list\n");
done(1);
}
maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1;
dprintf(stdout, "maxino = %d\n", maxino);
map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
if (map == (char *)NIL)
panic("no memory for file removal list\n");
clrimap = map;
curfile.action = USING;
getfile(xtrmap, xtrmapskip);
if (checktype(&spcl, TS_BITS) == FAIL) {
fprintf(stderr, "Cannot find file dump list\n");
done(1);
}
map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
if (map == (char *)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.
*/
getvol(nextvol)
long nextvol;
{
long newvol;
long savecnt, i;
union u_spcl tmpspcl;
# define tmpbuf tmpspcl.s_spcl
char buf[TP_BSIZE];
extern char *ctime();
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)
done(1); /* pipes do not get a second chance */
if (command == 'R' || command == 'r' || curfile.action != SKIP)
newvol = nextvol;
else
newvol = 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 towards the first.\n");
} else {
fprintf(stderr, "You have read volumes");
strcpy(tbf, ": ");
for (i = 1; i < 32; i++)
if (tapesread & (1 << i)) {
fprintf(stderr, "%s%d", tbf, i);
strcpy(tbf, ", ");
}
fprintf(stderr, "\n");
}
do {
fprintf(stderr, "Specify next volume #: ");
(void) fflush(stderr);
(void) fgets(tbf, BUFSIZ, terminal);
} while (!feof(terminal) && tbf[0] == '\n');
if (feof(terminal))
done(1);
newvol = atoi(tbf);
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(tbf, BUFSIZ, terminal);
if (feof(terminal))
done(1);
if (!strcmp(tbf, "none\n")) {
curfile.name = "<name unknown>";
curfile.action = UNKNOWN;
curfile.dip = (struct dinode *)NIL;
curfile.ino = maxino;
if (gettingfile) {
gettingfile = 0;
longjmp(restart, 1);
}
}
if (tbf[0] != '\n') {
(void) strcpy(magtape, tbf);
magtape[strlen(magtape) - 1] = '\0';
}
#ifdef RRESTORE
if ((mt = rmtopen(magtape, 0)) == -1)
#else
if ((mt = open(magtape, 0)) == -1)
#endif
{
fprintf(stderr, "Cannot open %s\n", magtape);
volno = -1;
goto again;
}
gethdr:
volno = newvol;
setdumpnum();
flsht();
if (readhdr(&tmpbuf) == FAIL) {
fprintf(stderr, "tape is not dump tape\n");
volno = 0;
goto again;
}
if (checkvol(&tmpbuf, volno) == FAIL) {
fprintf(stderr, "Wrong volume (%d)\n", tmpbuf.c_volume);
volno = 0;
goto again;
}
if (tmpbuf.c_date != dumpdate || tmpbuf.c_ddate != dumptime) {
fprintf(stderr, "Wrong dump date\n\tgot: %s",
ctime(&tmpbuf.c_date));
fprintf(stderr, "\twanted: %s", ctime(&dumpdate));
volno = 0;
goto again;
}
tapesread |= 1 << volno;
blksread = savecnt;
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 multiple dumps per tape by skipping forward to the
* appropriate one.
*/
setdumpnum()
{
struct mtop tcom;
if (dumpnum == 1 || volno != 1)
return;
if (pipein) {
fprintf(stderr, "Cannot have multiple dumps on pipe input\n");
done(1);
}
tcom.mt_op = MTFSF;
tcom.mt_count = dumpnum - 1;
#ifdef RRESTORE
rmtioctl(MTFSF, dumpnum - 1);
#else
if (ioctl(mt, (int)MTIOCTOP, (char *)&tcom) < 0)
perror("ioctl MTFSF");
#endif
}
printdumpinfo()
{
extern char *ctime();
fprintf(stdout, "Dump date: %s", ctime(&spcl.c_date));
fprintf(stdout, "Dumped from: %s",
(spcl.c_ddate == 0) ? "the epoch\n" : ctime(&spcl.c_ddate));
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);
}
extractfile(name)
char *name;
{
int mode;
struct timeval timep[2];
struct entry *ep;
extern int xtrlnkfile(), xtrlnkskip();
extern int xtrfile(), xtrskip();
curfile.name = name;
curfile.action = USING;
timep[0].tv_sec = curfile.dip->di_atime;
timep[0].tv_usec = 0;
timep[1].tv_sec = curfile.dip->di_mtime;
timep[1].tv_usec = 0;
mode = curfile.dip->di_mode;
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 == NIL || 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);
}
return (linkit(lnkbuf, name, SYMLINK));
case IFCHR:
case IFBLK:
vprintf(stdout, "extract special file %s\n", name);
if (Nflag) {
skipfile();
return (GOOD);
}
if (mknod(name, mode, (int)curfile.dip->di_rdev) < 0) {
fprintf(stderr, "%s: ", name);
(void) fflush(stderr);
perror("cannot create special file");
skipfile();
return (FAIL);
}
(void) chown(name, curfile.dip->di_uid, curfile.dip->di_gid);
(void) chmod(name, mode);
skipfile();
utimes(name, timep);
return (GOOD);
case IFREG:
vprintf(stdout, "extract file %s\n", name);
if (Nflag) {
skipfile();
return (GOOD);
}
if ((ofile = creat(name, 0666)) < 0) {
fprintf(stderr, "%s: ", name);
(void) fflush(stderr);
perror("cannot create file");
skipfile();
return (FAIL);
}
(void) fchown(ofile, curfile.dip->di_uid, curfile.dip->di_gid);
(void) fchmod(ofile, mode);
getfile(xtrfile, xtrskip);
(void) close(ofile);
utimes(name, timep);
return (GOOD);
}
/* NOTREACHED */
}
/*
* skip over bit maps on the tape
*/
skipmaps()
{
while (checktype(&spcl, TS_CLRI) == GOOD ||
checktype(&spcl, TS_BITS) == GOOD)
skipfile();
}
/*
* skip over a file on the tape
*/
skipfile()
{
extern int null();
curfile.action = SKIP;
getfile(null, null);
}
/*
* Do the file extraction, calling the supplied functions
* with the blocks
*/
getfile(f1, f2)
int (*f2)(), (*f1)();
{
register int i;
int curblk = 0;
off_t size = spcl.c_dinode.di_size;
static char clearedbuf[MAXBSIZE];
char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE];
char junk[TP_BSIZE];
if (checktype(&spcl, TS_END) == GOOD)
panic("ran off end of tape\n");
if (ishead(&spcl) == FAIL)
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 (curblk == fssize / TP_BSIZE) {
(*f1)(buf, size > TP_BSIZE ?
(long) (fssize) :
(curblk - 1) * TP_BSIZE + size);
curblk = 0;
}
} else {
if (curblk > 0) {
(*f1)(buf, size > TP_BSIZE ?
(long) (curblk * TP_BSIZE) :
(curblk - 1) * TP_BSIZE + size);
curblk = 0;
}
(*f2)(clearedbuf, size > TP_BSIZE ?
(long) TP_BSIZE : size);
}
if ((size -= TP_BSIZE) <= 0) {
for (i++; i < spcl.c_count; i++)
if (spcl.c_addr[i])
readtape(junk);
break;
}
}
if (readhdr(&spcl) == GOOD && size > 0) {
if (checktype(&spcl, TS_ADDR) == GOOD)
goto loop;
dprintf(stdout, "Missing address (header) block for %s\n",
curfile.name);
}
if (curblk > 0)
(*f1)(buf, (curblk * TP_BSIZE) + size);
findinode(&spcl);
gettingfile = 0;
}
/*
* The next routines are called during file extraction to
* put the data into the right form and place.
*/
xtrfile(buf, size)
char *buf;
long size;
{
if (Nflag)
return;
if (write(ofile, buf, (int) size) == -1) {
fprintf(stderr, "write error extracting inode %d, name %s\n",
curfile.ino, curfile.name);
perror("write");
done(1);
}
}
xtrskip(buf, size)
char *buf;
long size;
{
#ifdef lint
buf = buf;
#endif
if (lseek(ofile, size, 1) == (long)-1) {
fprintf(stderr, "seek error extracting inode %d, name %s\n",
curfile.ino, curfile.name);
perror("lseek");
done(1);
}
}
xtrlnkfile(buf, size)
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);
done(1);
}
(void) strcat(lnkbuf, buf);
}
xtrlnkskip(buf, size)
char *buf;
long size;
{
#ifdef lint
buf = buf, size = size;
#endif
fprintf(stderr, "unallocated block in symbolic link %s\n",
curfile.name);
done(1);
}
xtrmap(buf, size)
char *buf;
long size;
{
bcopy(buf, map, size);
map += size;
}
xtrmapskip(buf, size)
char *buf;
long size;
{
#ifdef lint
buf = buf;
#endif
panic("hole in map\n");
map += size;
}
null() {;}
/*
* Do the tape i/o, dealing with volume changes
* etc..
*/
readtape(b)
char *b;
{
register long i;
long rd, newvol;
int cnt;
top:
if (bct < numtrec) {
bcopy(&tbf[(bct++*TP_BSIZE)], b, (long)TP_BSIZE);
blksread++;
return;
}
for (i = 0; i < ntrec; i++)
((struct s_spcl *)&tbf[i*TP_BSIZE])->c_magic = 0;
if (numtrec == 0)
numtrec = ntrec;
cnt = ntrec*TP_BSIZE;
rd = 0;
getmore:
#ifdef RRESTORE
i = rmtread(&tbf[rd], cnt);
#else
i = read(mt, &tbf[rd], cnt);
#endif
/*
* Check for mid-tape short read error.
* If found, return rest of buffer.
*/
if (numtrec < ntrec && i != 0) {
numtrec = ntrec;
goto top;
}
/*
* Handle partial block read.
*/
if (i > 0 && i != ntrec*TP_BSIZE) {
if (pipein) {
rd += i;
cnt -= i;
if (cnt > 0)
goto getmore;
i = rd;
} else {
if (i % TP_BSIZE != 0)
panic("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 %d\n",
curfile.ino);
break;
}
if (!yflag && !reply("continue"))
done(1);
i = ntrec*TP_BSIZE;
bzero(tbf, i);
#ifdef RRESTORE
if (rmtseek(i, 1) < 0)
#else
if (lseek(mt, i, 1) == (long)-1)
#endif
{
perror("continuation failed");
done(1);
}
}
/*
* Handle end of tape.
*/
if (i == 0) {
if (!pipein) {
newvol = volno + 1;
volno = 0;
numtrec = 0;
getvol(newvol);
readtape(b);
return;
}
if (rd % TP_BSIZE != 0)
panic("partial block read: %d should be %d\n",
rd, ntrec * TP_BSIZE);
bcopy((char *)&endoftapemark, &tbf[rd], (long)TP_BSIZE);
}
bct = 0;
bcopy(&tbf[(bct++*TP_BSIZE)], b, (long)TP_BSIZE);
blksread++;
}
findtapeblksize()
{
register long i;
for (i = 0; i < ntrec; i++)
((struct s_spcl *)&tbf[i * TP_BSIZE])->c_magic = 0;
bct = 0;
#ifdef RRESTORE
i = rmtread(tbf, ntrec * TP_BSIZE);
#else
i = read(mt, tbf, ntrec * TP_BSIZE);
#endif
if (i <= 0) {
perror("Tape read error");
done(1);
}
if (i % TP_BSIZE != 0) {
fprintf(stderr, "Tape block size (%d) %s (%d)\n",
i, "is not a multiple of dump block size", TP_BSIZE);
done(1);
}
ntrec = i / TP_BSIZE;
numtrec = ntrec;
vprintf(stdout, "Tape block size is %d\n", ntrec);
}
flsht()
{
bct = ntrec+1;
}
closemt()
{
if (mt < 0)
return;
#ifdef RRESTORE
rmtclose();
#else
(void) close(mt);
#endif
}
checkvol(b, t)
struct s_spcl *b;
long t;
{
if (b->c_volume != t)
return(FAIL);
return(GOOD);
}
readhdr(b)
struct s_spcl *b;
{
if (gethead(b) == FAIL) {
dprintf(stdout, "readhdr fails at %d blocks\n", blksread);
return(FAIL);
}
return(GOOD);
}
/*
* read the tape into buf, then return whether or
* or not it is a header block.
*/
gethead(buf)
struct s_spcl *buf;
{
long i;
union u_ospcl {
char dummy[TP_BSIZE];
struct s_ospcl {
long c_type;
long c_date;
long c_ddate;
long c_volume;
long c_tapea;
u_short c_inumber;
long c_magic;
long c_checksum;
struct odinode {
unsigned short odi_mode;
u_short odi_nlink;
u_short odi_uid;
u_short odi_gid;
long odi_size;
long odi_rdev;
char odi_addr[36];
long odi_atime;
long odi_mtime;
long odi_ctime;
} c_dinode;
long c_count;
char c_addr[256];
} s_ospcl;
} u_ospcl;
if (!cvtflag) {
readtape((char *)buf);
if (buf->c_magic != NFS_MAGIC) {
if (swabl(buf->c_magic) != NFS_MAGIC)
return (FAIL);
if (!Bcvt) {
vprintf(stdout, "Note: Doing Byte swapping\n");
Bcvt = 1;
}
}
if (checksum((int *)buf) == FAIL)
return (FAIL);
if (Bcvt)
swabst("8l4s31l", (char *)buf);
goto good;
}
readtape((char *)(&u_ospcl.s_ospcl));
bzero((char *)buf, (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_magic = u_ospcl.s_ospcl.c_magic;
buf->c_dinode.di_mode = u_ospcl.s_ospcl.c_dinode.odi_mode;
buf->c_dinode.di_nlink = u_ospcl.s_ospcl.c_dinode.odi_nlink;
buf->c_dinode.di_uid = u_ospcl.s_ospcl.c_dinode.odi_uid;
buf->c_dinode.di_gid = u_ospcl.s_ospcl.c_dinode.odi_gid;
buf->c_dinode.di_size = u_ospcl.s_ospcl.c_dinode.odi_size;
buf->c_dinode.di_rdev = u_ospcl.s_ospcl.c_dinode.odi_rdev;
buf->c_dinode.di_atime = u_ospcl.s_ospcl.c_dinode.odi_atime;
buf->c_dinode.di_mtime = u_ospcl.s_ospcl.c_dinode.odi_mtime;
buf->c_dinode.di_ctime = u_ospcl.s_ospcl.c_dinode.odi_ctime;
buf->c_count = u_ospcl.s_ospcl.c_count;
bcopy(u_ospcl.s_ospcl.c_addr, buf->c_addr, (long)256);
if (u_ospcl.s_ospcl.c_magic != OFS_MAGIC ||
checksum((int *)(&u_ospcl.s_ospcl)) == FAIL)
return(FAIL);
buf->c_magic = NFS_MAGIC;
good:
if (buf->c_dinode.di_size == 0 &&
(buf->c_dinode.di_mode & IFMT) == IFDIR && Qcvt == 0) {
if (buf->c_dinode.di_qsize.val[0] ||
buf->c_dinode.di_qsize.val[1]) {
printf("Note: Doing Quad swapping\n");
Qcvt = 1;
}
}
if (Qcvt) {
i = buf->c_dinode.di_qsize.val[1];
buf->c_dinode.di_qsize.val[1] = buf->c_dinode.di_qsize.val[0];
buf->c_dinode.di_qsize.val[0] = i;
}
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_dinode.di_size = buf->c_count * TP_BSIZE;
for (i = 0; i < buf->c_count; i++)
buf->c_addr[i]++;
break;
case TS_TAPE:
case TS_END:
buf->c_inumber = 0;
break;
case TS_INODE:
case TS_ADDR:
break;
default:
panic("gethead: unknown inode type %d\n", buf->c_type);
break;
}
if (dflag)
accthdr(buf);
return(GOOD);
}
/*
* Check that a header is where it belongs and predict the next header
*/
accthdr(header)
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\n");
previno = 0x7fffffff;
return;
}
if (previno == 0x7fffffff)
goto newcalc;
switch (prevtype) {
case TS_BITS:
fprintf(stderr, "Dump mask header");
break;
case TS_CLRI:
fprintf(stderr, "Remove mask 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 %d blocks, got %d blocks",
predict, blksread - 1);
fprintf(stderr, "\n");
newcalc:
blks = 0;
if (header->c_type != TS_END)
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.
*/
findinode(header)
struct s_spcl *header;
{
static long skipcnt = 0;
long i;
char buf[TP_BSIZE];
curfile.name = "<name unknown>";
curfile.action = UNKNOWN;
curfile.dip = (struct dinode *)NIL;
curfile.ino = 0;
if (ishead(header) == FAIL) {
skipcnt++;
while (gethead(header) == FAIL || header->c_date != dumpdate)
skipcnt++;
}
for (;;) {
if (checktype(header, TS_ADDR) == GOOD) {
/*
* Skip up to the beginning of the next record
*/
for (i = 0; i < header->c_count; i++)
if (header->c_addr[i])
readtape(buf);
(void) gethead(header);
continue;
}
if (checktype(header, TS_INODE) == GOOD) {
curfile.dip = &header->c_dinode;
curfile.ino = header->c_inumber;
break;
}
if (checktype(header, TS_END) == GOOD) {
curfile.ino = maxino;
break;
}
if (checktype(header, TS_CLRI) == GOOD) {
curfile.name = "<file removal list>";
break;
}
if (checktype(header, TS_BITS) == GOOD) {
curfile.name = "<file dump list>";
break;
}
while (gethead(header) == FAIL)
skipcnt++;
}
if (skipcnt > 0)
fprintf(stderr, "resync restore, skipped %d blocks\n", skipcnt);
skipcnt = 0;
}
/*
* return whether or not the buffer contains a header block
*/
ishead(buf)
struct s_spcl *buf;
{
if (buf->c_magic != NFS_MAGIC)
return(FAIL);
return(GOOD);
}
checktype(b, t)
struct s_spcl *b;
int t;
{
if (b->c_type != t)
return(FAIL);
return(GOOD);
}
checksum(b)
register int *b;
{
register int i, j;
j = sizeof(union u_spcl) / sizeof(int);
i = 0;
if(!Bcvt) {
do
i += *b++;
while (--j);
} else {
/* What happens if we want to read restore tapes
for a 16bit int machine??? */
do
i += swabl(*b++);
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
/* VARARGS1 */
msg(cp, a1, a2, a3)
char *cp;
{
fprintf(stderr, cp, a1, a2, a3);
}
#endif RRESTORE
u_char *
swabshort(sp, n)
register u_char *sp;
register int n;
{
char c;
while (--n >= 0) {
c = sp[0]; sp[0] = sp[1]; sp[1] = c;
sp += 2;
}
return (sp);
}
u_char *
swablong(sp, n)
register u_char *sp;
register int n;
{
char c;
while (--n >= 0) {
c = sp[0]; sp[0] = sp[3]; sp[3] = c;
c = sp[2]; sp[2] = sp[1]; sp[1] = c;
sp += 4;
}
return (sp);
}
swabst(cp, sp)
register u_char *cp, *sp;
{
int n = 0;
u_char c;
while (*cp) {
switch (*cp) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
n = (n * 10) + (*cp++ - '0');
continue;
case 's': case 'w': case 'h':
if (n == 0)
n = 1;
sp = swabshort(sp, n);
break;
case 'l':
if (n == 0)
n = 1;
sp = swablong(sp, n);
break;
default: /* Any other character, like 'b' counts as byte. */
if (n == 0)
n = 1;
sp += n;
break;
}
cp++;
n = 0;
}
}
u_long
swabl(x)
u_long x;
{
swabst("l", (char *)&x);
return (x);
}