/* $OpenBSD: tape.c,v 1.13 1998/02/17 00:07:52 millert 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. 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 #if 0 static char sccsid[] = "@(#)tape.c 8.6 (Berkeley) 9/13/94"; #else static char rcsid[] = "$NetBSD: tape.c,v 1.22 1996/11/30 18:31:29 cgd Exp $"; #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 int pathlen; int oldinofmt; /* old inode format conversion required */ int Bcvt; /* Swap Bytes (for CCI or sun) */ static int Qcvt; /* Swap quads (for sun) */ #define FLUSHTAPEBUF() blkcnt = ntrec + 1 static void accthdr __P((struct s_spcl *)); static int checksum __P((int *)); static void findinode __P((struct s_spcl *)); static void findtapeblksize __P((void)); static int gethead __P((struct s_spcl *)); static void readtape __P((char *)); static void setdumpnum __P((void)); static u_long swabl __P((u_long)); static u_char *swablong __P((u_char *, int)); static u_char *swabshort __P((u_char *, int)); static void terminateinput __P((void)); static void xtrfile __P((char *, long)); static void xtrlnkfile __P((char *, long)); static void xtrlnkskip __P((char *, long)); static void xtrmap __P((char *, long)); static void xtrmapskip __P((char *, long)); static void xtrskip __P((char *, long)); /* * Set up an input source */ void setinput(source) char *source; { FLUSHTAPEBUF(); if (bflag) newtapebuf(ntrec); else newtapebuf(NTREC > HIGHDENSITYTREC ? NTREC : HIGHDENSITYTREC); 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)strcpy(magtape, source); } void newtapebuf(size) long size; { static tapebufsize = -1; ntrec = size; if (size <= tapebufsize) return; if (tapebuf != NULL) free(tapebuf); tapebuf = malloc(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() { 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, 0); 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 : 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) 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); /* * 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(nextvol) long nextvol; { long newvol, savecnt, wantnext, i; union u_spcl tmpspcl; # define tmpbuf tmpspcl.s_spcl char buf[TP_BSIZE]; 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"); strcpy(buf, ": "); for (i = 1; i < 32; i++) if (tapesread & (1 << i)) { fprintf(stderr, "%s%ld", 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 %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); (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); 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 %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) { 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 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 %d\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() { if (gettingfile && curfile.action == USING) { printf("Warning: %s %s\n", "End-of-input encountered while extracting", curfile.name); } curfile.name = ""; curfile.action = UNKNOWN; curfile.dip = NULL; 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() { 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, (int)MTIOCTOP, (char *)&tcom) < 0) warn("ioctl MTFSF"); } void printdumpinfo() { 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); } int extractfile(name) char *name; { u_int flags; mode_t mode; struct timeval timep[2]; struct entry *ep; curfile.name = name; curfile.action = USING; timep[0].tv_sec = curfile.dip->di_atime; timep[0].tv_usec = curfile.dip->di_atimensec / 1000; timep[1].tv_sec = curfile.dip->di_mtime; timep[1].tv_usec = curfile.dip->di_mtimensec / 1000; mode = curfile.dip->di_mode; flags = curfile.dip->di_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: { /* Gotta save these, linkit() changes curfile. */ uid_t luid = curfile.dip->di_uid; gid_t lgid = curfile.dip->di_gid; 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, luid, lgid); 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.dip->di_rdev) < 0) { warn("%s: cannot create special file", name); skipfile(); return (FAIL); } (void)chown(name, curfile.dip->di_uid, curfile.dip->di_gid); (void)chmod(name, mode); (void)chflags(name, flags); skipfile(); utimes(name, timep); 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, curfile.dip->di_uid, curfile.dip->di_gid); (void)chmod(name, mode); (void)chflags(name, flags); skipfile(); utimes(name, timep); 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.dip->di_uid, curfile.dip->di_gid); (void)fchmod(ofile, mode); (void)fchflags(ofile, flags); getfile(xtrfile, xtrskip); (void)close(ofile); utimes(name, timep); return (GOOD); } /* NOTREACHED */ } /* * skip over bit maps on the tape */ void skipmaps() { while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI) skipfile(); } /* * skip over a file on the tape */ void skipfile() { 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. */ void getfile(fill, skip) void (*fill) __P((char *, long)); void (*skip) __P((char *, long)); { register int i; volatile int curblk = 0; volatile long size = spcl.c_dinode.di_size; static char clearedbuf[MAXBSIZE]; char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE]; char junk[TP_BSIZE]; if (spcl.c_type == TS_END) panic("ran off end of tape\n"); if (spcl.c_magic != NFS_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 (curblk == fssize / TP_BSIZE) { (*fill)((char *)buf, size > TP_BSIZE ? (long) (fssize) : (curblk - 1) * TP_BSIZE + size); curblk = 0; } } else { if (curblk > 0) { (*fill)((char *)buf, size > TP_BSIZE ? (long) (curblk * TP_BSIZE) : (curblk - 1) * TP_BSIZE + size); curblk = 0; } (*skip)(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 (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, (curblk * TP_BSIZE) + size); findinode(&spcl); gettingfile = 0; } /* * Write out the next block of a file. */ static void xtrfile(buf, size) char *buf; long size; { if (Nflag) return; if (write(ofile, buf, (int) 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(buf, size) char *buf; long size; { if (lseek(ofile, 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(buf, size) char *buf; long size; { pathlen += size; if (pathlen > MAXPATHLEN) errx(1, "symbolic link name: %s->%s%s; too long %d", curfile.name, lnkbuf, buf, pathlen); (void)strcat(lnkbuf, buf); } /* * Skip over a hole in a symbolic link (should never happen). */ /* ARGSUSED */ static void xtrlnkskip(buf, size) char *buf; long size; { errx(1, "unallocated block in symbolic link %s", curfile.name); } /* * Collect the next block of a bit map. */ static void xtrmap(buf, size) char *buf; long size; { memcpy(map, buf, size); map += size; } /* * Skip over a hole in a bit map (should never happen). */ /* ARGSUSED */ static void xtrmapskip(buf, size) char *buf; long size; { panic("hole in map\n"); map += size; } /* * Noop, when an extraction function is not needed. */ /* ARGSUSED */ void xtrnull(buf, size) char *buf; long size; { return; } /* * Read TP_BSIZE blocks from the input. * Handle read errors, and end of media. */ static void readtape(buf) 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() { register 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() { 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(buf) struct s_spcl *buf; { long i; union { quad_t qval; int32_t val[2]; } qcvt; 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_dinode; int32_t 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((u_char *)"8l4s31l528b1l192b2l", (u_char *)buf); goto good; } readtape((char *)(&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_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; memcpy(buf->c_addr, u_ospcl.s_ospcl.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_size > 0xfffffff) && (buf->c_dinode.di_mode & IFMT) == IFDIR && Qcvt == 0) { qcvt.qval = buf->c_dinode.di_size; if (qcvt.val[0] || qcvt.val[1]) { printf("Note: Doing Quad swapping\n"); Qcvt = 1; } } if (Qcvt) { qcvt.qval = buf->c_dinode.di_size; i = qcvt.val[1]; qcvt.val[1] = qcvt.val[0]; qcvt.val[0] = i; buf->c_dinode.di_size = qcvt.qval; } 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: if ((buf->c_flags & DR_NEWINODEFMT) == 0) oldinofmt = 1; /* fall through */ 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 we are restoring a filesystem with old format inodes, * copy the uid/gid to the new location. */ if (oldinofmt) { buf->c_dinode.di_uid = buf->c_dinode.di_ouid; buf->c_dinode.di_gid = buf->c_dinode.di_ogid; } if (dflag) accthdr(buf); return(GOOD); } /* * Check that a header is where it belongs and predict the next header */ static void 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 (%s inode format) ", oldinofmt ? "old" : "new"); if (header->c_firstrec) fprintf(stderr, "begins with record %d", 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; 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. */ static void findinode(header) struct s_spcl *header; { static long skipcnt = 0; long i; char buf[TP_BSIZE]; curfile.name = ""; curfile.action = UNKNOWN; curfile.dip = NULL; curfile.ino = 0; do { if (header->c_magic != NFS_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.dip = &header->c_dinode; curfile.ino = header->c_inumber; break; case TS_END: curfile.ino = maxino; break; case TS_CLRI: curfile.name = ""; break; case TS_BITS: curfile.name = ""; 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(buf) register int *buf; { register int i, j; j = sizeof(union u_spcl) / sizeof(int); i = 0; if(!Bcvt) { do i += *buf++; while (--j); } else { /* What happens if we want to read restore tapes for a 16bit int machine??? */ do i += swabl(*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 #ifdef __STDC__ #include #else #include #endif void #ifdef __STDC__ msg(const char *fmt, ...) #else msg(fmt, va_alist) char *fmt; va_dcl #endif { va_list ap; #ifdef __STDC__ va_start(ap, fmt); #else va_start(ap); #endif (void)vfprintf(stderr, fmt, ap); va_end(ap); } #endif /* RRESTORE */ static 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); } static 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); } void swabst(cp, sp) register u_char *cp, *sp; { int n = 0; 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; } } static u_long swabl(x) u_long x; { swabst((u_char *)"l", (u_char *)&x); return (x); }