4.3BSD-UWisc/src/etc/restore/tape.c
#ifndef lint
static char sccsid[] = "@(#)tape.c 1.1 85/05/30 SMI"; /* from UCB 3.20 83/07/01 */
#endif
/* Copyright (c) 1983 Regents of the University of California */
#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>
#define MAXINO 65535 /* KLUDGE */
static long fssize;
static int mt = -1;
static int pipein = 0;
static char *magtape;
static int bct;
int ntrec = NTREC;
static char *tbf = NULL;
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;
char *host;
/*
* Set up an input source
*/
setinput(source)
char *source;
{
terminal = stdin;
if (index(source, ':')) {
host = source;
magtape = index(host, ':');
*magtape++ = '\0';
if (rmthost(host) == 0)
done(1);
setuid(getuid());
} else {
if (strcmp(source, "-") == 0) {
/*
* Since input is coming from a pipe we must establish
* our own connection to the terminal.
*/
terminal = fopen("/dev/tty", "r");
if (terminal == NULL) {
perror("open(\"/dev/tty\")");
done(1);
}
pipein++;
}
magtape = source;
}
}
/*
* 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 char *ctime();
extern int xtrmap(), xtrmapskip();
vprintf(stdout, "Verify tape and initialize maps\n");
if (host) {
if ((mt = rmtopen(magtape, 0)) < 0) {
perror(magtape);
done(1);
}
} else {
if (pipein)
mt = 0;
else if ((mt = open(magtape, 0)) < 0) {
perror(magtape);
done(1);
}
}
volno = 1;
setdumpnum();
flsht();
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') {
fprintf(stdout, "Dump date: %s", ctime(&spcl.c_date));
fprintf(stdout, "Dumped from: %s", ctime(&spcl.c_ddate));
}
dumptime = spcl.c_ddate;
dumpdate = spcl.c_date;
if (stat(".", &stbuf) < 0) {
perror("cannot stat .");
done(1);
}
fssize = stbuf.st_blksize;
if (fssize <= 0 || ((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, 1);
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);
/*
* Allocate space for at least MAXINO inodes to allow us
* to restore partial dump tapes written before dump was
* fixed to write out the entire inode map.
*/
map = calloc((unsigned)1,
(unsigned)howmany(maxino > MAXINO ? maxino : MAXINO, NBBY));
if (map == (char *)NIL)
panic("no memory for file removal list\n");
clrimap = map;
curfile.action = USING;
getfile(xtrmap, xtrmapskip);
if (MAXINO > maxino)
maxino = MAXINO;
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);
}
/*
* Initialize fssize variable for 'R' command to work.
*/
setupR()
{
struct stat stbuf;
if (stat(".", &stbuf) < 0) {
perror("cannot stat .");
done(1);
}
fssize = stbuf.st_blksize;
if (fssize <= 0 || ((fssize - 1) & fssize) != 0) {
fprintf(stderr, "bad block size %d\n", fssize);
done(1);
}
}
/*
* 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
if (nextvol == 1)
tapesread = 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 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 then type return ", newvol);
(void) fflush(stderr);
while (getc(terminal) != '\n')
;
if ((host != 0 && (mt = rmtopen(magtape, 0)) == -1) ||
(host == 0 && (mt = open(magtape, 0)) == -1)) {
fprintf(stderr, "Cannot open tape!\n");
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;
}
(void) gethead(&spcl);
findinode(&spcl, curfile.action == UNKNOWN ? 1 : 0);
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;
if (host)
rmtioctl(MTFSF, dumpnum - 1);
else
if (ioctl(mt, (int)MTIOCTOP, (char *)&tcom) < 0)
perror("ioctl MTFSF");
}
extractfile(name)
char *name;
{
int mode;
time_t timep[2];
struct entry *ep;
extern int xtrlnkfile(), xtrlnkskip();
extern int xtrfile(), xtrskip();
curfile.name = name;
curfile.action = USING;
timep[0] = curfile.dip->di_atime;
timep[1] = curfile.dip->di_mtime;
mode = curfile.dip->di_mode;
switch (mode & IFMT) {
default:
fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode);
skipfile();
return (FAIL);
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);
} else if (symlink(lnkbuf, name) < 0) {
fprintf(stderr, "%s: ", name);
(void) fflush(stderr);
perror("cannot create symbolic link");
return (FAIL);
} else
vprintf(stdout, "extract symbolic link %s\n", name);
return (GOOD);
case IFCHR:
case IFBLK:
vprintf(stdout, "extract special file %s\n", name);
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();
utime(name, timep);
return (GOOD);
case IFREG:
vprintf(stdout, "extract file %s\n", name);
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);
utime(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];
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)
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, 1);
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 (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;
if (bct >= ntrec) {
for (i = 0; i < ntrec; i++)
((struct s_spcl *)&tbf[i*TP_BSIZE])->c_magic = 0;
bct = 0;
cnt = ntrec*TP_BSIZE;
rd = 0;
getmore:
if (host)
i = rmtread(&tbf[rd], cnt);
else
i = read(mt, &tbf[rd], cnt);
if (i > 0 && i != ntrec*TP_BSIZE) {
if (!pipein)
panic("partial block read: %d should be %d\n",
i, ntrec*TP_BSIZE);
rd += i;
cnt -= i;
if (cnt > 0)
goto getmore;
i = rd;
}
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 resyncronize\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);
if ((host != 0 && rmtseek(i, 1) < 0) ||
(host == 0 && lseek(mt, i, 1) == (long)-1)) {
perror("continuation failed");
done(1);
}
}
if (i == 0) {
if (pipein) {
bcopy((char *)&endoftapemark, b,
(long)TP_BSIZE);
flsht();
return;
}
newvol = volno + 1;
volno = 0;
getvol(newvol);
readtape(b);
return;
}
}
bcopy(&tbf[(bct++*TP_BSIZE)], b, (long)TP_BSIZE);
blksread++;
}
flsht()
{
if (tbf == NULL) {
tbf = malloc(ntrec*TP_BSIZE);
if (tbf == NULL) {
fprintf(stderr, "can't allocate tape buffer\n");
done(1);
}
}
bct = ntrec+1;
}
closemt()
{
if (mt < 0)
return;
if (host)
rmtclose();
else
(void) close(mt);
}
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 || checksum((int *)buf) == FAIL)
return(FAIL);
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:
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");
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, complain)
struct s_spcl *header;
int complain;
{
static long skipcnt = 0;
curfile.name = "<name unknown>";
curfile.action = UNKNOWN;
curfile.dip = (struct dinode *)NIL;
curfile.ino = 0;
if (ishead(header) == FAIL) {
skipcnt++;
while (gethead(header) == FAIL)
skipcnt++;
}
for (;;) {
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 && complain)
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;
do
i += *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);
}
/* VARARGS1 */
msg(cp, a1, a2, a3)
char *cp;
{
fprintf(stderr, cp, a1, a2, a3);
}