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remote
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From: Arnold Robbins <gatech!arnold>
Subject: Remote mag tape routines
Keywords: remote magnetic tapes, tar, dd
Newsgroups: mod.sources
Approved: john@genrad.UUCP
Mod.sources: Volume 2, Issue 21
Submitted by: Arnold Robbins <gatech!arnold>
Title: Remote mag tape routines, re-written as a general library (+ tar, dd)
Although the remote mag tape stuff for tar was just posted recently, this
is worth re-posting since it 1) fixes a few bugs, and 2) provides a much more
general facility for accessing remote tape drives. E.g., to fix dd for
remote tape drives, all I had to do was add one line and recompile with
the library.
Credit is given in the man page for the people who did the work.
Enjoy,
Arnold Robbins
CSNET: arnold@gatech ARPA: arnold%gatech.csnet@csnet-relay.arpa
UUCP: { akgua, allegra, hplabs, ihnp4, seismo, ut-sally }!gatech!arnold
--------------------- axe your screen here -----------------------
#!/bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #!/bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
# README
# dd.1.DIFF
# dd.c.DIFF
# rmt.h
# rmtlib.c
# rmtops.3
# tar.1.DIFF
# tar.c.DIFF
# This archive created: Mon Jul 29 13:04:33 1985
# By: Arnold Robbins (Pr1mebusters!)
export PATH; PATH=/bin:$PATH
echo shar: extracting "'README'" '(851 characters)'
if test -f 'README'
then
echo shar: over-writing existing file "'README'"
fi
cat << \SHAR_EOF > 'README'
README --- remote mag tape library and diffs for tar(1) and dd(1)
The files in this directory implement a library of routines which allow
a user using the Unix system calls for i/o to transparently access a tape
drive on a remote machine, via rsh(1) and rmt(8).
The files are as follows:
README --- This file.
dd.1.DIFF --- Context diff for dd(1) man page.
dd.c.DIFF --- Context diff for dd.c source code.
tar.1.DIFF --- Context diff for tar(1) man page.
tar.c.DIFF --- Context diff for tar.c source code.
rmt.h --- Remote mag tape include file.
rmtlib.c --- Remote mag tape library source code.
rmtops.3 --- Remote mag tape library man page.
The diffs are for BRL Unix 3.0 (4.2 BSD), your line numbers may vary.
The tar(1) diffs include a fix to keep tar from damaging the file system;
existing directories are removed only if they are empty.
SHAR_EOF
echo shar: extracting "'dd.1.DIFF'" '(1273 characters)'
if test -f 'dd.1.DIFF'
then
echo shar: over-writing existing file "'dd.1.DIFF'"
fi
cat << \SHAR_EOF > 'dd.1.DIFF'
*** /usr/man/man1/dd.1 Mon Apr 4 06:12:26 1983
--- dd.1 Wed Jul 24 12:29:58 1985
***************
*** 23,29
.ns
.TP
if=
! input file name; standard input is default
.br
.ns
.TP
--- 23,45 -----
.ns
.TP
if=
! input file name; standard input is default.
! If the input file name has the form
! .IR system [. user ]:/dev/???,
! then
! .I dd
! will attempt to use the tape drive /dev/??? on the remote system
! .IR system ,
! via
! .IR rsh (1),
! and
! .IR rmt (8).
! The optional
! .I user
! specifies the login name to use on the remote system.
! If it is not given, the current user's login name will be used.
! In all cases, the user must have the appropriate
! access permissions on the remote machine in order for this to work.
.br
.ns
.TP
***************
*** 28,34
.ns
.TP
of=
! output file name; standard output is default
.br
.ns
.TP
--- 44,51 -----
.ns
.TP
of=
! output file name; standard output is default,
! remote file names may be used here as well.
.br
.ns
.TP
***************
*** 203,205
raw disks with bad sectors to insure
.I dd
stays synchronized.
--- 220,224 -----
raw disks with bad sectors to insure
.I dd
stays synchronized.
+ .br
+ Using a remote system's tape drive can be slow.
SHAR_EOF
echo shar: extracting "'dd.c.DIFF'" '(360 characters)'
if test -f 'dd.c.DIFF'
then
echo shar: over-writing existing file "'dd.c.DIFF'"
fi
cat << \SHAR_EOF > 'dd.c.DIFF'
*** /usr/src/bin/dd.c Fri Apr 29 04:20:35 1983
--- dd.c Tue Jul 23 14:13:53 1985
***************
*** 2,7
#include <stdio.h>
#include <signal.h>
#define BIG 2147483647
#define LCASE 01
#define UCASE 02
--- 2,9 -----
#include <stdio.h>
#include <signal.h>
+ #include <rmt.h>
+
#define BIG 2147483647
#define LCASE 01
#define UCASE 02
SHAR_EOF
echo shar: extracting "'rmt.h'" '(904 characters)'
if test -f 'rmt.h'
then
echo shar: over-writing existing file "'rmt.h'"
fi
cat << \SHAR_EOF > 'rmt.h'
/*
* rmt.h
*
* Added routines to replace open(), close(), lseek(), ioctl(), etc.
* The preprocessor can be used to remap these the rmtopen(), etc
* thus minimizing source changes.
*
* This file must be included before <sys/stat.h>, since it redefines
* stat to be rmtstat, so that struct stat xyzzy; declarations work
* properly.
*
* -- Fred Fish (w/some changes by Arnold Robbins)
*/
#ifndef access /* avoid multiple redefinition */
#ifndef lint /* in this case what lint doesn't know won't hurt it */
#define access rmtaccess
#define close rmtclose
#define creat rmtcreat
#define dup rmtdup
#define fcntl rmtfcntl
#define fstat rmtfstat
#define ioctl rmtioctl
#define isatty rmtisatty
#define lseek rmtlseek
#define lstat rmtlstat
#define open rmtopen
#define read rmtread
#define stat rmtstat
#define write rmtwrite
extern long rmtlseek (); /* all the rest are int's */
#endif
#endif
SHAR_EOF
echo shar: extracting "'rmtlib.c'" '(13608 characters)'
if test -f 'rmtlib.c'
then
echo shar: over-writing existing file "'rmtlib.c'"
fi
cat << \SHAR_EOF > 'rmtlib.c'
/*
* rmt --- remote tape emulator subroutines
*
* Originally written by Jeff Lee, modified some by Arnold Robbins
*
* WARNING: The man page rmt(8) for /etc/rmt documents the remote mag
* tape protocol which rdump and rrestore use. Unfortunately, the man
* page is *WRONG*. The author of the routines I'm including originally
* wrote his code just based on the man page, and it didn't work, so he
* went to the rdump source to figure out why. The only thing he had to
* change was to check for the 'F' return code in addition to the 'E',
* and to separate the various arguments with \n instead of a space. I
* personally don't think that this is much of a problem, but I wanted to
* point it out.
* -- Arnold Robbins
*
* Redone as a library that can replace open, read, write, etc, by
* Fred Fish, with some additional work by Arnold Robbins.
*/
/*
* MAXUNIT --- Maximum number of remote tape file units
*
* READ --- Return the number of the read side file descriptor
* WRITE --- Return the number of the write side file descriptor
*/
#define RMTIOCTL 1
#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#ifdef RMTIOCTL
#include <sys/ioctl.h>
#include <sys/mtio.h>
#endif
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>
#define BUFMAGIC 64 /* a magic number for buffer sizes */
#define MAXUNIT 4
#define READ(fd) (Ctp[fd][0])
#define WRITE(fd) (Ptc[fd][1])
static int Ctp[MAXUNIT][2] = { -1, -1, -1, -1, -1, -1, -1, -1 };
static int Ptc[MAXUNIT][2] = { -1, -1, -1, -1, -1, -1, -1, -1 };
static jmp_buf Jmpbuf;
extern int errno;
/*
* abort --- close off a remote tape connection
*/
static void abort(fildes)
int fildes;
{
close(READ(fildes));
close(WRITE(fildes));
READ(fildes) = -1;
WRITE(fildes) = -1;
}
/*
* command --- attempt to perform a remote tape command
*/
static int command(fildes, buf)
int fildes;
char *buf;
{
register int blen;
int (*pstat)();
/*
* save current pipe status and try to make the request
*/
blen = strlen(buf);
pstat = signal(SIGPIPE, SIG_IGN);
if (write(WRITE(fildes), buf, blen) == blen)
{
signal(SIGPIPE, pstat);
return(0);
}
/*
* something went wrong. close down and go home
*/
signal(SIGPIPE, pstat);
abort(fildes);
errno = EIO;
return(-1);
}
/*
* status --- retrieve the status from the pipe
*/
static int status(fildes)
int fildes;
{
int i;
char c, *cp;
char buffer[BUFMAGIC];
/*
* read the reply command line
*/
for (i = 0, cp = buffer; i < BUFMAGIC; i++, cp++)
{
if (read(READ(fildes), cp, 1) != 1)
{
abort(fildes);
errno = EIO;
return(-1);
}
if (*cp == '\n')
{
*cp = 0;
break;
}
}
if (i == BUFMAGIC)
{
abort(fildes);
errno = EIO;
return(-1);
}
/*
* check the return status
*/
for (cp = buffer; *cp; cp++)
if (*cp != ' ')
break;
if (*cp == 'E' || *cp == 'F')
{
errno = atoi(cp + 1);
while (read(READ(fildes), &c, 1) == 1)
if (c == '\n')
break;
if (*cp == 'F')
abort(fildes);
return(-1);
}
/*
* check for mis-synced pipes
*/
if (*cp != 'A')
{
abort(fildes);
errno = EIO;
return(-1);
}
return(atoi(cp + 1));
}
/*
* _rmt_open --- open a magtape device on system specified, as given user
*
* file name has the form system[.user]:/dev/????
*/
#define MAXHOSTLEN 257 /* BSD allows very long host names... */
static int _rmt_open (path, oflag, mode)
char *path;
int oflag;
int mode;
{
int i, rc;
char buffer[BUFMAGIC];
char system[MAXHOSTLEN];
char device[BUFMAGIC];
char login[BUFMAGIC];
char *sys, *dev, *user;
sys = system;
dev = device;
user = login;
/*
* first, find an open pair of file descriptors
*/
for (i = 0; i < MAXUNIT; i++)
if (READ(i) == -1 && WRITE(i) == -1)
break;
if (i == MAXUNIT)
{
errno = EMFILE;
return(-1);
}
/*
* pull apart system and device, and optional user
* don't munge original string
*/
while (*path != '.' && *path != ':') {
*sys++ = *path++;
}
*sys = '\0';
path++;
if (*(path - 1) == '.')
{
while (*path != ':') {
*user++ = *path++;
}
*user = '\0';
path++;
}
else
*user = '\0';
while (*path) {
*dev++ = *path++;
}
*dev = '\0';
/*
* setup the pipes for the 'rsh' command and fork
*/
if (pipe(Ptc[i]) == -1 || pipe(Ctp[i]) == -1)
return(-1);
if ((rc = fork()) == -1)
return(-1);
if (rc == 0)
{
close(0);
dup(Ptc[i][0]);
close(Ptc[i][0]); close(Ptc[i][1]);
close(1);
dup(Ctp[i][1]);
close(Ctp[i][0]); close(Ctp[i][1]);
(void) setuid (getuid ());
(void) setgid (getgid ());
if (*user)
{
execl("/usr/ucb/rsh", "rsh", system, "-l", login,
"/etc/rmt", (char *) 0);
execl("/usr/bin/remsh", "remsh", system, "-l", login,
"/etc/rmt", (char *) 0);
}
else
{
execl("/usr/ucb/rsh", "rsh", system,
"/etc/rmt", (char *) 0);
execl("/usr/bin/remsh", "remsh", system,
"/etc/rmt", (char *) 0);
}
/*
* bad problems if we get here
*/
perror("exec");
exit(1);
}
close(Ptc[i][0]); close(Ctp[i][1]);
/*
* now attempt to open the tape device
*/
sprintf(buffer, "O%s\n%d\n", device, oflag);
if (command(i, buffer) == -1 || status(i) == -1)
return(-1);
return(i);
}
/*
* _rmt_close --- close a remote magtape unit and shut down
*/
static int _rmt_close(fildes)
int fildes;
{
int rc;
if (command(fildes, "C\n") != -1)
{
rc = status(fildes);
abort(fildes);
return(rc);
}
return(-1);
}
/*
* _rmt_read --- read a buffer from a remote tape
*/
static int _rmt_read(fildes, buf, nbyte)
int fildes;
char *buf;
unsigned int nbyte;
{
int rc, i;
char buffer[BUFMAGIC];
sprintf(buffer, "R%d\n", nbyte);
if (command(fildes, buffer) == -1 || (rc = status(fildes)) == -1)
return(-1);
for (i = 0; i < rc; i += nbyte, buf += nbyte)
{
nbyte = read(READ(fildes), buf, rc);
if (nbyte <= 0)
{
abort(fildes);
errno = EIO;
return(-1);
}
}
return(rc);
}
/*
* _rmt_write --- write a buffer to the remote tape
*/
static int _rmt_write(fildes, buf, nbyte)
int fildes;
char *buf;
unsigned int nbyte;
{
int rc;
char buffer[BUFMAGIC];
int (*pstat)();
sprintf(buffer, "W%d\n", nbyte);
if (command(fildes, buffer) == -1)
return(-1);
pstat = signal(SIGPIPE, SIG_IGN);
if (write(WRITE(fildes), buf, nbyte) == nbyte)
{
signal (SIGPIPE, pstat);
return(status(fildes));
}
signal (SIGPIPE, pstat);
abort(fildes);
errno = EIO;
return(-1);
}
/*
* _rmt_lseek --- perform an imitation lseek operation remotely
*/
static long _rmt_lseek(fildes, offset, whence)
int fildes;
long offset;
int whence;
{
char buffer[BUFMAGIC];
sprintf(buffer, "L%d\n%d\n", offset, whence);
if (command(fildes, buffer) == -1)
return(-1);
return(status(fildes));
}
#ifdef RMTIOCTL
/*
* _rmt_ioctl --- perform raw tape operations remotely
*/
static _rmt_ioctl(fildes, op, arg)
int fildes, op;
char *arg;
{
char c;
int rc, cnt;
char buffer[BUFMAGIC];
/*
* MTIOCOP is the easy one. nothing is transfered in binary
*/
if (op == MTIOCTOP)
{
sprintf(buffer, "I%d\n%d\n", ((struct mtop *) arg)->mt_op,
((struct mtop *) arg)->mt_count);
if (command(fildes, buffer) == -1)
return(-1);
return(status(fildes));
}
/*
* we can only handle 2 ops, if not the other one, punt
*/
if (op != MTIOCGET)
{
errno = EINVAL;
return(-1);
}
/*
* grab the status and read it directly into the structure
* this assumes that the status buffer is (hopefully) not
* padded and that 2 shorts fit in a long without any word
* alignment problems, ie - the whole struct is contiguous
* NOTE - this is probably NOT a good assumption.
*/
if (command(fildes, "S\n") == -1 || (rc = status(fildes)) == -1)
return(-1);
for (; rc > 0; rc -= cnt, arg += cnt)
{
cnt = read(READ(fildes), arg, rc);
if (cnt <= 0)
{
abort(fildes);
errno = EIO;
return(-1);
}
}
/*
* now we check for byte position. mt_type is a small integer field
* (normally) so we will check its magnitude. if it is larger than
* 256, we will assume that the bytes are swapped and go through
* and reverse all the bytes
*/
if (((struct mtget *) arg)->mt_type < 256)
return(0);
for (cnt = 0; cnt < rc; cnt += 2)
{
c = arg[cnt];
arg[cnt] = arg[cnt+1];
arg[cnt+1] = c;
}
return(0);
}
#endif /* RMTIOCTL */
/*
* Added routines to replace open(), close(), lseek(), ioctl(), etc.
* The preprocessor can be used to remap these the rmtopen(), etc
* thus minimizing source changes:
*
* #ifdef REMOTETAPE
* # define access rmtaccess
* # define close rmtclose
* # define creat rmtcreat
* # define dup rmtdup
* # define fcntl rmtfcntl
* # define fstat rmtfstat
* # define ioctl rmtioctl
* # define isatty rmtisatty
* # define lseek rmtlseek
* # define lstat rmtlstat
* # define open rmtopen
* # define read rmtread
* # define stat rmtstat
* # define write rmtwrite
* # define access rmtaccess
* # define close rmtclose
* # define creat rmtcreat
* # define dup rmtdup
* # define fcntl rmtfcntl
* # define fstat rmtfstat
* # define ioctl rmtioctl
* # define lseek rmtlseek
* # define open rmtopen
* # define read rmtread
* # define stat rmtstat
* # define write rmtwrite
* #endif
*
* -- Fred Fish
*
* ADR --- I set up a <rmt.h> include file for this
*
*/
/*
* Note that local vs remote file descriptors are distinquished
* by adding a bias to the remote descriptors. This is a quick
* and dirty trick that may not be portable to some systems.
*/
#define REM_BIAS 128
/*
* Test pathname to see if it is local or remote. A remote device
* is any string that contains ":/dev/". Returns 1 if remote,
* 0 otherwise.
*/
static int remdev (path)
register char *path;
{
#define strchr index
extern char *strchr ();
if ((path = strchr (path, ':')) != NULL)
{
if (strncmp (path + 1, "/dev/", 5) == 0)
{
return (1);
}
}
return (0);
}
/*
* Open a local or remote file. Looks just like open(2) to
* caller.
*/
int rmtopen (path, oflag, mode)
char *path;
int oflag;
int mode;
{
if (remdev (path))
{
return (_rmt_open (path, oflag, mode) + REM_BIAS);
}
else
{
return (open (path, oflag, mode));
}
}
/*
* Test pathname for specified access. Looks just like access(2)
* to caller.
*/
int rmtaccess (path, amode)
char *path;
int amode;
{
if (remdev (path))
{
return (0); /* Let /etc/rmt find out */
}
else
{
return (access (path, amode));
}
}
/*
* Read from stream. Looks just like read(2) to caller.
*/
int rmtread (fildes, buf, nbyte)
int fildes;
char *buf;
unsigned int nbyte;
{
if (isrmt (fildes))
{
return (_rmt_read (fildes - REM_BIAS, buf, nbyte));
}
else
{
return (read (fildes, buf, nbyte));
}
}
/*
* Write to stream. Looks just like write(2) to caller.
*/
int rmtwrite (fildes, buf, nbyte)
int fildes;
char *buf;
unsigned int nbyte;
{
if (isrmt (fildes))
{
return (_rmt_write (fildes - REM_BIAS, buf, nbyte));
}
else
{
return (write (fildes, buf, nbyte));
}
}
/*
* Perform lseek on file. Looks just like lseek(2) to caller.
*/
long rmtlseek (fildes, offset, whence)
int fildes;
long offset;
int whence;
{
if (isrmt (fildes))
{
return (_rmt_lseek (fildes - REM_BIAS, offset, whence));
}
else
{
return (lseek (fildes, offset, whence));
}
}
/*
* Close a file. Looks just like close(2) to caller.
*/
int rmtclose (fildes)
int fildes;
{
if (isrmt (fildes))
{
return (_rmt_close (fildes - REM_BIAS));
}
else
{
return (close (fildes));
}
}
/*
* Do ioctl on file. Looks just like ioctl(2) to caller.
*/
int rmtioctl (fildes, request, arg)
int fildes, request, arg;
{
if (isrmt (fildes))
{
errno = EOPNOTSUPP;
return (-1); /* For now (fnf) */
}
else
{
return (ioctl (fildes, request, arg));
}
}
/*
* Duplicate an open file descriptor. Looks just like dup(2)
* to caller.
*/
int rmtdup (fildes)
int fildes;
{
if (isrmt (fildes))
{
errno = EOPNOTSUPP;
return (-1); /* For now (fnf) */
}
else
{
return (dup (fildes));
}
}
/*
* Get file status. Looks just like fstat(2) to caller.
*/
int rmtfstat (fildes, buf)
int fildes;
struct stat *buf;
{
if (isrmt (fildes))
{
errno = EOPNOTSUPP;
return (-1); /* For now (fnf) */
}
else
{
return (fstat (fildes, buf));
}
}
/*
* Get file status. Looks just like stat(2) to caller.
*/
int rmtstat (path, buf)
char *path;
struct stat *buf;
{
if (remdev (path))
{
errno = EOPNOTSUPP;
return (-1); /* For now (fnf) */
}
else
{
return (stat (path, buf));
}
}
/*
* Create a file from scratch. Looks just like creat(2) to the caller.
*/
#include <sys/file.h> /* BSD DEPENDANT!!! */
/* #include <fcntl.h> /* use this one for S5 with remote stuff */
int rmtcreat (path, mode)
char *path;
int mode;
{
if (remdev (path))
{
return (rmtopen (path, 1 | O_CREAT, mode));
}
else
{
return (creat (path, mode));
}
}
/*
* Isrmt. Let a programmer know he has a remote device.
*/
int isrmt (fd)
int fd;
{
return (fd >= REM_BIAS);
}