* Ported to Linux's Second Extended File System as part of the
* dump and restore backup suit
* Remy Card <card@Linux.EU.Org>, 1994-1997
- * Stelian Pop <pop@cybercable.fr>, 1999
+ * Stelian Pop <pop@noos.fr>, 1999-2000
+ * Stelian Pop <pop@noos.fr> - AlcĂ´ve <www.alcove.fr>, 2000
*/
/*
#ifndef lint
static const char rcsid[] =
- "$Id: tape.c,v 1.9 1999/11/22 21:39:42 tiniou Exp $";
+ "$Id: tape.c,v 1.27 2001/03/19 13:22:49 stelian Exp $";
#endif /* not lint */
+#include <config.h>
+#include <errno.h>
+#include <compaterr.h>
+#include <setjmp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
#include <sys/param.h>
#include <sys/file.h>
#include <sys/mtio.h>
#ifdef __linux__
#include <sys/time.h>
+#include <time.h>
#include <linux/ext2_fs.h>
+#include <ext2fs/ext2fs.h>
#include <bsdcompat.h>
#else /* __linux__ */
#include <ufs/ufs/dinode.h>
#endif /* __linux__ */
#include <protocols/dumprestore.h>
-#include <errno.h>
-#include <compaterr.h>
-#include <setjmp.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#ifdef __linux__
-#include <ext2fs/ext2fs.h>
-#endif
+#ifdef HAVE_ZLIB
+#include <zlib.h>
+#endif /* HAVE_ZLIB */
#include "restore.h"
#include "extern.h"
static long fssize = MAXBSIZE;
static int mt = -1;
static int pipein = 0;
-static char magtape[NAME_MAX];
-static char magtapeprefix[NAME_MAX];
+static int magtapein = 0; /* input is from magtape */
+static char magtape[MAXPATHLEN];
+static char magtapeprefix[MAXPATHLEN];
static int blkcnt;
static int numtrec;
-static char *tapebuf;
+static char *tapebuf; /* input buffer for read */
+static int bufsize; /* buffer size without prefix */
+static char *tbufptr = NULL; /* active tape buffer */
+#ifdef HAVE_ZLIB
+static char *comprbuf; /* uncompress work buf */
+static size_t comprlen; /* size including prefix */
+#endif
static union u_spcl endoftapemark;
static long blksread; /* blocks read since last header */
static long tpblksread = 0; /* TP_BSIZE blocks read */
static void readtape __P((char *));
static void setdumpnum __P((void));
static u_int swabi __P((u_int));
+#if 0
static u_long swabl __P((u_long));
+#endif
static u_char *swab64 __P((u_char *, int));
static u_char *swab32 __P((u_char *, int));
static u_char *swab16 __P((u_char *, int));
static void xtrmapskip __P((char *, size_t));
static void xtrskip __P((char *, size_t));
+#ifdef HAVE_ZLIB
+static void newcomprbuf __P((long));
+static void readtape_set __P((char *));
+static void readtape_uncompr __P((char *));
+static void readtape_comprfile __P((char *));
+static void readtape_comprtape __P((char *));
+static char *decompress_tapebuf __P((struct tapebuf *, int));
+static void msg_read_error __P((char *));
+#endif
+static int read_a_block __P((int, void *, size_t, long *));
+#define PREFIXSIZE sizeof(struct tapebuf)
+
+#define COMPARE_ONTHEFLY 1
+
+#if COMPARE_ONTHEFLY
+static int ifile; /* input file for compare */
+static int cmperror; /* compare error */
+static void xtrcmpfile __P((char *, size_t));
+static void xtrcmpskip __P((char *, size_t));
+#endif
+
static int readmapflag;
/*
- * Set up an input source
+ * Set up an input source. This is called from main.c before setup() is.
*/
void
setinput(char *source)
}
setuid(getuid()); /* no longer need or want root privileges */
if (Mflag) {
- strncpy(magtapeprefix, source, NAME_MAX);
- magtapeprefix[NAME_MAX-1] = '\0';
- snprintf(magtape, NAME_MAX, "%s%03d", source, 1);
+ strncpy(magtapeprefix, source, MAXPATHLEN);
+ magtapeprefix[MAXPATHLEN-1] = '\0';
+ snprintf(magtape, MAXPATHLEN, "%s%03d", source, 1);
}
else
- strncpy(magtape, source, NAME_MAX);
- magtape[NAME_MAX - 1] = '\0';
+ strncpy(magtape, source, MAXPATHLEN);
+ magtape[MAXPATHLEN - 1] = '\0';
}
void
static int tapebufsize = -1;
ntrec = size;
+ bufsize = ntrec * TP_BSIZE;
if (size <= tapebufsize)
return;
if (tapebuf != NULL)
free(tapebuf);
- tapebuf = malloc(size * TP_BSIZE);
+ tapebuf = malloc(size * TP_BSIZE + sizeof(struct tapebuf));
if (tapebuf == NULL)
errx(1, "Cannot allocate space for tape buffer");
tapebufsize = size;
}
+#ifdef HAVE_ZLIB
+static void
+newcomprbuf(long size)
+{
+ if (size <= comprlen)
+ return;
+ comprlen = size + sizeof(struct tapebuf);
+ if (comprbuf != NULL)
+ free(comprbuf);
+ comprbuf = malloc(comprlen);
+ if (comprbuf == NULL)
+ errx(1, "Cannot allocate space for decompress buffer");
+}
+#endif /* HAVE_ZLIB */
+
/*
* Verify that the tape drive can be accessed and
* that it actually is a dump tape.
{
int i, j, *ip;
struct stat stbuf;
+ struct mtget mt_stat;
Vprintf(stdout, "Verify tape and initialize maps\n");
#ifdef RRESTORE
if (mt < 0)
err(1, "%s", magtape);
volno = 1;
+ if (!pipein) {
+ /* need to know if input is really from a tape */
+#ifdef RRESTORE
+ if (host)
+ magtapein = rmtioctl(MTNOP, 1) != -1;
+ else
+#endif
+ magtapein = ioctl(mt, MTIOCGET, (char *) &mt_stat) == 0;
+ }
+
+ Vprintf(stdout,"Input is from %s\n", magtapein? "tape": "file/pipe");
setdumpnum();
FLUSHTAPEBUF();
- if (!pipein && !bflag)
- findtapeblksize();
+ findtapeblksize();
if (gethead(&spcl) == FAIL) {
blkcnt--; /* push back this block */
blksread--;
errx(1, "Tape is not a dump tape");
fprintf(stderr, "Converting to new file system format.\n");
}
+
+ if (zflag) {
+ fprintf(stderr, "Dump tape is compressed.\n");
+#ifdef HAVE_ZLIB
+ newcomprbuf(bufsize);
+#else
+ errx(1,"This restore version doesn't support decompression");
+#endif /* HAVE_ZLIB */
+ }
if (pipein) {
endoftapemark.s_spcl.c_magic = cvtflag ? OFS_MAGIC : NFS_MAGIC;
endoftapemark.s_spcl.c_type = TS_END;
}
if (vflag || command == 't' || command == 'C')
printdumpinfo();
- if (filesys == NULL) {
- filesys = spcl.c_filesys;
+ if (filesys[0] == '\0') {
+ char *dirptr;
+ strncpy(filesys, spcl.c_filesys, NAMELEN);
+ filesys[NAMELEN - 1] = '\0';
+ dirptr = strstr(filesys, " (dir");
+ if (dirptr != NULL)
+ *dirptr = '\0';
}
dumptime = spcl.c_ddate;
dumpdate = spcl.c_date;
if (spcl.c_type != TS_CLRI)
errx(1, "Cannot find file removal list");
maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1;
- Dprintf(stdout, "maxino = %ld\n", maxino);
+ Dprintf(stdout, "maxino = %ld\n", (long)maxino);
map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
if (map == NULL)
- panic("no memory for active inode map\n");
+ errx(1, "no memory for active inode map");
usedinomap = map;
curfile.action = USING;
getfile(xtrmap, xtrmapskip);
errx(1, "Cannot find file dump list");
map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
if (map == (char *)NULL)
- panic("no memory for file dump list\n");
+ errx(1, "no memory for file dump list");
dumpmap = map;
curfile.action = USING;
getfile(xtrmap, xtrmapskip);
do {
fprintf(stderr, "Specify next volume #: ");
(void) fflush(stderr);
- (void) fgets(buf, BUFSIZ, terminal);
+ (void) fgets(buf, TP_BSIZE, terminal);
} while (!feof(terminal) && buf[0] == '\n');
if (feof(terminal))
exit(1);
}
closemt();
if (Mflag) {
- snprintf(magtape, NAME_MAX, "%s%03ld", magtapeprefix, newvol);
- magtape[NAME_MAX - 1] = '\0';
+ snprintf(magtape, MAXPATHLEN, "%s%03ld", magtapeprefix, newvol);
+ magtape[MAXPATHLEN - 1] = '\0';
}
if (!Mflag || haderror) {
haderror = 0;
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);
+ (void) fgets(buf, TP_BSIZE, terminal);
if (feof(terminal))
exit(1);
if (!strcmp(buf, "none\n")) {
#endif
if (spcl.c_host[0] == '\0')
return;
- fprintf(stderr, "Level %d dump of %s on %s:%s\n",
+ fprintf(stdout, "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);
+ fprintf(stdout, "Label: %s\n", spcl.c_label);
}
int
return;
}
+#if COMPARE_ONTHEFLY
+/*
+ * Compare the next block of a file.
+ */
+static void
+xtrcmpfile(char *buf, size_t size)
+{
+ static char cmpbuf[MAXBSIZE];
+
+ if (cmperror)
+ return;
+
+ if (read(ifile, cmpbuf, size) != size) {
+ fprintf(stderr, "%s: size has changed.\n",
+ curfile.name);
+ cmperror = 1;
+ return;
+ }
+
+ if (memcmp(buf, cmpbuf, size) != 0) {
+ fprintf(stderr, "%s: tape and disk copies are different\n",
+ curfile.name);
+ cmperror = 1;
+ return;
+ }
+}
+
+/*
+ * Skip over a hole in a file.
+ */
+static void
+xtrcmpskip(char *buf, size_t size)
+{
+ static char cmpbuf[MAXBSIZE];
+ int i;
+
+ if (cmperror)
+ return;
+
+ if (read(ifile, cmpbuf, size) != size) {
+ fprintf(stderr, "%s: size has changed.\n",
+ curfile.name);
+ cmperror = 1;
+ return;
+ }
+
+ for (i = 0; i < size; ++i)
+ if (cmpbuf[i] != '\0') {
+ fprintf(stderr, "%s: tape and disk copies are different\n",
+ curfile.name);
+ cmperror = 1;
+ return;
+ }
+}
+#endif /* COMPARE_ONTHEFLY */
+
+#if !COMPARE_ONTHEFLY
static int
do_cmpfiles(int fd_tape, int fd_disk, long size)
{
if (stat(tapefile, &sbuf_tape) != 0) {
panic("Can't lstat tmp file %s: %s\n", tapefile,
strerror(errno));
+ compare_errors = 1;
}
if (sbuf_disk->st_size != sbuf_tape.st_size) {
fprintf(stderr,
"%s: size changed from %ld to %ld.\n",
diskfile, (long)sbuf_tape.st_size, (long)sbuf_disk->st_size);
+ compare_errors = 1;
#ifdef COMPARE_FAIL_KEEP_FILE
return (0);
#else
if ((fd_tape = open(tapefile, O_RDONLY)) < 0) {
panic("Can't open %s: %s\n", tapefile, strerror(errno));
+ compare_errors = 1;
}
if ((fd_disk = open(diskfile, O_RDONLY)) < 0) {
close(fd_tape);
panic("Can't open %s: %s\n", diskfile, strerror(errno));
+ compare_errors = 1;
}
if (do_cmpfiles(fd_tape, fd_disk, sbuf_tape.st_size)) {
diskfile);
close(fd_tape);
close(fd_disk);
+ compare_errors = 1;
#ifdef COMPARE_FAIL_KEEP_FILE
/* rename the file to live in /tmp */
/* rename `tapefile' to /tmp/<basename of diskfile> */
return (1);
#endif
}
+#endif /* !COMPARE_ONTHEFLY */
+#if !COMPARE_ONTHEFLY
static char tmpfilename[MAXPATHLEN];
+#endif
void
comparefile(char *name)
{
- static char *tmpfile = NULL;
int mode;
- struct stat sb, stemp;
+ struct stat sb;
int r;
+#if !COMPARE_ONTHEFLY
+ static char *tmpfile = NULL;
+ struct stat stemp;
+#endif
if ((r = lstat(name, &sb)) != 0) {
warn("%s: does not exist (%d)", name, r);
+ compare_errors = 1;
skipfile();
return;
}
if (sb.st_mode != mode) {
fprintf(stderr, "%s: mode changed from 0%o to 0%o.\n",
name, mode & 07777, sb.st_mode & 07777);
+ compare_errors = 1;
}
switch (mode & IFMT) {
default:
if (!(sb.st_mode & S_IFLNK)) {
fprintf(stderr, "%s: is no longer a symbolic link\n",
name);
+ compare_errors = 1;
return;
}
lnkbuf[0] = '\0';
fprintf(stderr,
"%s: zero length symbolic link (ignored)\n",
name);
+ compare_errors = 1;
return;
}
if ((lsize = readlink(name, lbuf, MAXPATHLEN)) < 0) {
panic("readlink of %s failed: %s", name,
strerror(errno));
+ compare_errors = 1;
}
lbuf[lsize] = 0;
if (strcmp(lbuf, lnkbuf) != 0) {
fprintf(stderr,
"%s: symbolic link changed from %s to %s.\n",
name, lnkbuf, lbuf);
+ compare_errors = 1;
return;
}
return;
if (!(sb.st_mode & (S_IFCHR|S_IFBLK))) {
fprintf(stderr, "%s: no longer a special file\n",
name);
+ compare_errors = 1;
skipfile();
return;
}
(int)curfile.dip->di_rdev & 0xff,
((int)sb.st_rdev >> 8) & 0xff,
(int)sb.st_rdev & 0xff);
+ compare_errors = 1;
}
skipfile();
return;
case IFREG:
+#if COMPARE_ONTHEFLY
+ if ((ifile = open(name, O_RDONLY)) < 0) {
+ panic("Can't open %s: %s\n", name, strerror(errno));
+ skipfile();
+ compare_errors = 1;
+ }
+ else {
+ cmperror = 0;
+ getfile(xtrcmpfile, xtrcmpskip);
+ if (!cmperror) {
+ char c;
+ if (read(ifile, &c, 1) != 0) {
+ fprintf(stderr, "%s: size has changed.\n",
+ name);
+ cmperror = 1;
+ }
+ }
+ if (cmperror)
+ compare_errors = 1;
+ close(ifile);
+ }
+#else
if (tmpfile == NULL) {
/* argument to mktemp() must not be in RO space: */
snprintf(tmpfilename, sizeof(tmpfilename), "%s/restoreCXXXXXX", tmpdir);
cmpfiles(tmpfile, name, &sb);
unlink(tmpfile);
#endif
+#endif /* COMPARE_ONTHEFLY */
return;
}
/* NOTREACHED */
}
+#ifdef HAVE_ZLIB
+static void (*readtape_func)(char *) = readtape_set;
+
+/*
+ * Read TP_BSIZE blocks from the input.
+ * Handle read errors, and end of media.
+ * Decompress compressed blocks.
+ */
+static void
+readtape(char *buf)
+{
+ (*readtape_func)(buf); /* call the actual processing routine */
+}
+
+/*
+ * Set function pointer for readtape() routine. zflag and magtapein must
+ * be correctly set before the first call to readtape().
+ */
+static void
+readtape_set(char *buf)
+{
+ if (!zflag)
+ readtape_func = readtape_uncompr;
+ else {
+ if (magtapein)
+ readtape_func = readtape_comprtape;
+ else
+ readtape_func = readtape_comprfile;
+ }
+ readtape(buf);
+}
+
+#endif /* HAVE_ZLIB */
+
/*
+ * This is the original readtape(), it's used for reading uncompressed input.
* Read TP_BSIZE blocks from the input.
* Handle read errors, and end of media.
*/
static void
+#ifdef HAVE_ZLIB
+readtape_uncompr(char *buf)
+#else
readtape(char *buf)
+#endif
{
ssize_t rd, newvol, i;
int cnt, seek_failed;
if (blkcnt < numtrec) {
- memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
+ memmove(buf, &tbufptr[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
blksread++;
tpblksread++;
return;
}
+ tbufptr = tapebuf;
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;
+ if (zflag)
+ cnt += PREFIXSIZE;
rd = 0;
getmore:
#ifdef RRESTORE
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.
#endif
seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1);
- if (seek_failed)
- err(1, "continuation failed");
+ if (seek_failed) {
+ warn("continuation failed");
+ if (!yflag && !reply("assume end-of-tape and continue"))
+ exit(1);
+ i = 0;
+ }
}
/*
* Handle end of tape.
memmove(&tapebuf[rd], &endoftapemark, TP_BSIZE);
}
blkcnt = 0;
- memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
+ memmove(buf, &tbufptr[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
blksread++;
tpblksread++;
}
+#ifdef HAVE_ZLIB
+
+/*
+ * Read a compressed format block from a file or pipe and uncompress it.
+ * Attempt to handle read errors, and end of file.
+ */
static void
-findtapeblksize(void)
+readtape_comprfile(char *buf)
{
- register long i;
+ long rl, size, i, ret;
+ int newvol;
+ struct tapebuf *tpb;
+ if (blkcnt < numtrec) {
+ memmove(buf, &tbufptr[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
+ blksread++;
+ tpblksread++;
+ return;
+ }
+ /* need to read the next block */
+ tbufptr = tapebuf;
for (i = 0; i < ntrec; i++)
((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
+ numtrec = ntrec;
+ tpb = (struct tapebuf *) tapebuf;
+
+ /* read the block prefix */
+ ret = read_a_block(mt, tapebuf, PREFIXSIZE, &rl);
+ if (ret <= 0)
+ goto readerr;
+
+ /* read the data */
+ size = tpb->length;
+ if (size > bufsize) {
+ /* something's wrong */
+ Vprintf(stdout, "Prefix size error, max size %d, got %ld\n",
+ bufsize, size);
+ size = bufsize;
+ tpb->length = bufsize;
+ }
+ ret = read_a_block(mt, tpb->buf, size, &rl);
+ if (ret <= 0)
+ goto readerr;
+
+ tbufptr = decompress_tapebuf(tpb, rl + PREFIXSIZE);
+ if (tbufptr == NULL) {
+ msg_read_error("File decompression error while");
+ if (!yflag && !reply("continue"))
+ exit(1);
+ memset(tapebuf, 0, bufsize);
+ tbufptr = tapebuf;
+ }
+
blkcnt = 0;
+ memmove(buf, &tbufptr[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
+ blksread++;
+ tpblksread++;
+ return;
+
+readerr:
+ /* Errors while reading from a file or pipe are catastrophic. Since
+ * there are no block boundaries, it's impossible to bypass the
+ * block in error and find the start of the next block.
+ */
+ if (ret == 0) {
+ /* It's possible to have multiple input files using -M
+ * and -f file1,file2...
+ */
+ Vprintf(stdout, "End-of-File encountered\n");
+ if (!pipein) {
+ newvol = volno + 1;
+ volno = 0;
+ numtrec = 0;
+ getvol(newvol);
+ readtape(buf);
+ return;
+ }
+ }
+ msg_read_error("Read error while");
+ /* if (!yflag && !reply("continue")) */
+ exit(1);
+}
+
+/*
+ * Read compressed data from a tape and uncompress it.
+ * Handle read errors, and end of media.
+ * Since a tape consists of separate physical blocks, we try
+ * to recover from errors by repositioning the tape to the next
+ * block.
+ */
+static void
+readtape_comprtape(char *buf)
+{
+ long rl, size, i;
+ int ret, newvol;
+ struct tapebuf *tpb;
+ struct mtop tcom;
+
+ if (blkcnt < numtrec) {
+ memmove(buf, &tbufptr[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
+ blksread++;
+ tpblksread++;
+ return;
+ }
+ /* need to read the next block */
+ tbufptr = tapebuf;
+ for (i = 0; i < ntrec; i++)
+ ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
+ numtrec = ntrec;
+ tpb = (struct tapebuf *) tapebuf;
+
+ /* read the block */
+ size = bufsize + PREFIXSIZE;
+ ret = read_a_block(mt, tapebuf, size, &rl);
+ if (ret <= 0)
+ goto readerr;
+
+ tbufptr = decompress_tapebuf(tpb, rl);
+ if (tbufptr == NULL) {
+ msg_read_error("Tape decompression error while");
+ if (!yflag && !reply("continue"))
+ exit(1);
+ memset(tapebuf, 0, PREFIXSIZE + bufsize);
+ tbufptr = tapebuf;
+ }
+ goto moverecord;
+
+readerr:
+ /* Handle errors: EOT switches to the next volume, other errors
+ * attempt to position the tape to the next block.
+ */
+ if (ret == 0) {
+ Vprintf(stdout, "End-of-tape encountered\n");
+ newvol = volno + 1;
+ volno = 0;
+ numtrec = 0;
+ getvol(newvol);
+ readtape(buf);
+ return;
+ }
+
+ msg_read_error("Tape read error while");
+ if (!yflag && !reply("continue"))
+ exit(1);
+ memset(tapebuf, 0, PREFIXSIZE + bufsize);
+ tbufptr = tapebuf;
+
#ifdef RRESTORE
if (host)
- i = rmtread(tapebuf, (size_t)(ntrec * TP_BSIZE));
+ rl = rmtioctl(MTFSR, 1);
else
#endif
- i = read(mt, tapebuf, (size_t)(ntrec * TP_BSIZE));
+ {
+ tcom.mt_op = MTFSR;
+ tcom.mt_count = 1;
+ rl = ioctl(mt, MTIOCTOP, &tcom);
+ }
+
+ if (rl < 0) {
+ warn("continuation failed");
+ if (!yflag && !reply("assume end-of-tape and continue"))
+ exit(1);
+ ret = 0; /* end of tape */
+ goto readerr;
+ }
- 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)",
- (long)i, TP_BSIZE);
+moverecord:
+ blkcnt = 0;
+ memmove(buf, &tbufptr[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
+ blksread++;
+ tpblksread++;
+}
+
+/*
+ * Decompress a struct tapebuf into a buffer. readsize is the size read
+ * from the tape/file and is used for error messages. Returns a pointer
+ * to the location of the uncompressed buffer or NULL on errors.
+ * Adjust numtrec and complain for a short block.
+ */
+static char *
+decompress_tapebuf(struct tapebuf *tpbin, int readsize)
+{
+ /* If zflag is on, all blocks have a struct tapebuf prefix */
+ /* zflag gets set in setup() from the dump header */
+ int cresult, blocklen;
+ unsigned long worklen;
+ char *output = NULL,*reason = NULL, *lengtherr = NULL;
+
+ /* build a length error message */
+ blocklen = tpbin->length;
+ if (readsize < blocklen + PREFIXSIZE)
+ lengtherr = "short";
+ else
+ if (readsize > blocklen + PREFIXSIZE)
+ lengtherr = "long";
+
+ worklen = comprlen;
+ cresult = Z_OK;
+ if (tpbin->compressed) {
+ /* uncompress whatever we read, if it fails, complain later */
+ cresult = uncompress(comprbuf, &worklen, tpbin->buf, blocklen);
+ output = comprbuf;
+ }
+ else {
+ output = tpbin->buf;
+ worklen = blocklen;
+ }
+ switch (cresult) {
+ case Z_OK:
+ if (worklen != ntrec * TP_BSIZE) {
+ /* short block, shouldn't happen, but... */
+ reason = "length mismatch";
+ if (worklen % TP_BSIZE == 0)
+ numtrec = worklen / TP_BSIZE;
+ }
+ break;
+ case Z_MEM_ERROR:
+ reason = "not enough memory";
+ break;
+ case Z_BUF_ERROR:
+ reason = "buffer too small";
+ break;
+ case Z_DATA_ERROR:
+ reason = "data error";
+ break;
+ default:
+ reason = "unknown";
+ } /*switch */
+ if (reason) {
+ if (lengtherr)
+ fprintf(stderr, "%s compressed block: %d expected: %d\n",
+ lengtherr, readsize, tpbin->length + PREFIXSIZE);
+ fprintf(stderr, "decompression error, block %ld: %s\n",
+ tpblksread+1, reason);
+ if (cresult != Z_OK) output = NULL;
+ }
+ return output;
+}
+
+/*
+ * Print an error message for a read error.
+ * This was exteracted from the original readtape().
+ */
+static void
+msg_read_error(char *m)
+{
+ switch (curfile.action) {
+ default:
+ fprintf(stderr, "%s trying to set up tape\n", m);
+ break;
+ case UNKNOWN:
+ fprintf(stderr, "%s trying to resynchronize\n", m);
+ break;
+ case USING:
+ fprintf(stderr, "%s restoring %s\n", m, curfile.name);
+ break;
+ case SKIP:
+ fprintf(stderr, "%s skipping over inode %lu\n", m,
+ (unsigned long)curfile.ino);
+ break;
+ }
+}
+#endif /* HAVE_ZLIB */
+
+/*
+ * Read the first block and set the blocksize from its length. Test
+ * if the block looks like a compressed dump tape. setup() will make
+ * the final determination by checking the compressed flag if gethead()
+ * finds a valid header. The test here is necessary to offset the buffer
+ * by the size of the compressed prefix. zflag is set here so that
+ * readtape_set can set the correct function pointer for readtape().
+ * Note that the first block of each tape/file will not be compressed.
+ */
+static void
+findtapeblksize(void)
+{
+ long i;
+ size_t len;
+ struct tapebuf *tpb = (struct tapebuf *) tapebuf;
+ struct s_spcl *spclpt = (struct s_spcl *) tpb->buf;
+
+ for (i = 0; i < ntrec; i++)
+ ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
+ blkcnt = 0;
+ tbufptr = tapebuf;
+ /*
+ * For a pipe or file, read in the first record. For a tape, read
+ * the first block.
+ */
+ len = magtapein ? bufsize + PREFIXSIZE: TP_BSIZE;
+
+ if (read_a_block(mt, tapebuf, len, &i) <= 0)
+ errx(1, "Tape read error on first record");
+
+ /*
+ * If the input is from a file or a pipe, we read TP_BSIZE
+ * bytes looking for a compressed dump header, we then
+ * need to read in the rest of the record, as determined by
+ * tpb->length or bufsize. The first block of the dump is
+ * guaranteed to not be compressed so we look at the header.
+ */
+ if (!magtapein) {
+ if (tpb->length % TP_BSIZE == 0
+ && tpb->length <= bufsize
+ && tpb->compressed == 0
+ && spclpt->c_type == TS_TAPE
+ && spclpt->c_flags & DR_COMPRESSED) {
+ /* Looks like it's a compressed dump block prefix, */
+ /* read in the rest of the block based on tpb->length. */
+ len = tpb->length - TP_BSIZE + PREFIXSIZE;
+ if (read_a_block(mt, tapebuf+TP_BSIZE, len, &i) <= 0
+ || i != len)
+ errx(1,"Error reading dump file header");
+ tbufptr = tpb->buf;
+ numtrec = ntrec = tpb->length / TP_BSIZE;
+ zflag = 1;
+ }
+ else {
+ /* read in the rest of the block based on bufsize */
+ len = bufsize - TP_BSIZE;
+ if (read_a_block(mt, tapebuf+TP_BSIZE, len, &i) <= 0
+ || i != len)
+ errx(1,"Error reading dump file header");
+ tbufptr = tapebuf;
+ numtrec = ntrec;
+ }
+ Vprintf(stdout, "Input block size is %ld\n", ntrec);
+ return;
+ }
+
+ /*
+ * If the input is a tape, we tried to read PREFIXSIZE +
+ * ntrec * TP_BSIZE bytes. If it's not a compressed dump tape
+ * or the value of ntrec is too large, we have read less than
+ * what we asked for; adjust the value of ntrec and test for
+ * a compressed dump tape prefix.
+ */
+
+ if (i % TP_BSIZE != 0) {
+ if (i % TP_BSIZE == PREFIXSIZE
+ && tpb->compressed == 0
+ && spclpt->c_type == TS_TAPE
+ && spclpt->c_flags & DR_COMPRESSED) {
+
+ zflag = 1;
+ tbufptr = tpb->buf;
+ if (tpb->length > bufsize)
+ errx(1, "Tape blocksize is too large, use "
+ "\'-b %d\' ", tpb->length / TP_BSIZE);
+ }
+ else
+ 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);
}
+/*
+ * Read a block of data handling all of the messy details.
+ */
+static int read_a_block(int fd, void *buf, size_t len, long *lengthread)
+{
+ long i = 1, size;
+
+ size = len;
+ while (size > 0) {
+#ifdef RRESTORE
+ if (host)
+ i = rmtread(buf, size);
+ else
+#endif
+ i = read(fd, buf, size);
+
+ if (i <= 0)
+ break; /* EOD or error */
+ size -= i;
+ if (magtapein)
+ break; /* block at a time for mt */
+ buf += i;
+ }
+ *lengthread = len - size;
+ return i;
+}
+
void
closemt(void)
{
fprintf(stderr, "File header, ino %lu", (unsigned long)previno);
break;
case TS_ADDR:
- fprintf(stderr, "File continuation header, ino %ld", previno);
+ fprintf(stderr, "File continuation header, ino %ld", (long)previno);
break;
case TS_END:
fprintf(stderr, "End of tape header");
return (x);
}
+#if 0
static u_long
swabl(u_long x)
{
swabst((u_char *)"l", (u_char *)&x);
return (x);
}
+#endif