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This commit is contained in:
François Pinard
1994-11-16 02:55:23 +00:00
parent 8993d67115
commit db2eecfb4b
2 changed files with 656 additions and 0 deletions
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87
src/getoldopt.c Normal file
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/* Replacement for getopt() that can be used by tar.
Copyright (C) 1988 Free Software Foundation
This file is part of GNU Tar.
GNU Tar is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Tar is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Tar; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
* Plug-compatible replacement for getopt() for parsing tar-like
* arguments. If the first argument begins with "-", it uses getopt;
* otherwise, it uses the old rules used by tar, dump, and ps.
*
* Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu)
*/
#include <stdio.h>
#include "getopt.h"
#include "tar.h" /* For msg() declaration if STDC_MSG. */
int
getoldopt(argc, argv, optstring, long_options, opt_index)
int argc;
char **argv;
char *optstring;
struct option *long_options;
int *opt_index;
{
extern char *optarg; /* Points to next arg */
extern int optind; /* Global argv index */
static char *key; /* Points to next keyletter */
static char use_getopt; /* !=0 if argv[1][0] was '-' */
extern char *index();
char c;
char *place;
optarg = NULL;
if (key == NULL) { /* First time */
if (argc < 2) return EOF;
key = argv[1];
if ((*key == '-') || (*key == '+'))
use_getopt++;
else
optind = 2;
}
if (use_getopt)
return getopt_long(argc, argv, optstring,
long_options, opt_index);
c = *key++;
if (c == '\0') {
key--;
return EOF;
}
place = index(optstring, c);
if (place == NULL || c == ':') {
msg("unknown option %c", c);
return('?');
}
place++;
if (*place == ':') {
if (optind < argc) {
optarg = argv[optind];
optind++;
} else {
msg("%c argument missing", c);
return('?');
}
}
return(c);
}

569
src/rtapelib.c Normal file
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/* Functions for communicating with a remote tape drive.
Copyright (C) 1988, 1992 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* 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
Originally written by Jeff Lee, modified some by Arnold Robbins.
Redone as a library that can replace open, read, write, etc., by
Fred Fish, with some additional work by Arnold Robbins.
Modified to make all rmtXXX calls into macros for speed by Jay Fenlason.
Use -DUSE_REXEC for rexec code, courtesy of Dan Kegel, srs!dan. */
#include <stdio.h>
#include <sys/types.h>
#include <signal.h>
#ifndef NO_MTIO
#include <sys/ioctl.h>
#include <sys/mtio.h>
#endif
#ifdef USE_REXEC
#include <netdb.h>
#endif
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>
#ifndef errno
extern int errno;
#endif
/* Maximum size of a fully qualified host name. */
#define MAXHOSTLEN 257
/* Size of buffers for reading and writing commands to rmt.
(An arbitrary limit.) */
#define CMDBUFSIZE 64
#ifndef RETSIGTYPE
#define RETSIGTYPE void
#endif
/* Maximum number of simultaneous remote tape connections.
(Another arbitrary limit.) */
#define MAXUNIT 4
/* Return the parent's read side of remote tape connection FILDES. */
#define READ(fildes) (from_rmt[fildes][0])
/* Return the parent's write side of remote tape connection FILDES. */
#define WRITE(fildes) (to_rmt[fildes][1])
/* The pipes for receiving data from remote tape drives. */
static int from_rmt[MAXUNIT][2] = {-1, -1, -1, -1, -1, -1, -1, -1};
/* The pipes for sending data to remote tape drives. */
static int to_rmt[MAXUNIT][2] = {-1, -1, -1, -1, -1, -1, -1, -1};
/* Temporary variable used by macros in rmt.h. */
char *__rmt_path;
/* Close remote tape connection FILDES. */
static void
_rmt_shutdown (fildes)
int fildes;
{
close (READ (fildes));
close (WRITE (fildes));
READ (fildes) = -1;
WRITE (fildes) = -1;
}
/* Attempt to perform the remote tape command specified in BUF
on remote tape connection FILDES.
Return 0 if successful, -1 on error. */
static int
command (fildes, buf)
int fildes;
char *buf;
{
register int buflen;
RETSIGTYPE (*pipe_handler) ();
/* Save the current pipe handler and try to make the request. */
pipe_handler = signal (SIGPIPE, SIG_IGN);
buflen = strlen (buf);
if (write (WRITE (fildes), buf, buflen) == buflen)
{
signal (SIGPIPE, pipe_handler);
return 0;
}
/* Something went wrong. Close down and go home. */
signal (SIGPIPE, pipe_handler);
_rmt_shutdown (fildes);
errno = EIO;
return -1;
}
/* Read and return the status from remote tape connection FILDES.
If an error occurred, return -1 and set errno. */
static int
status (fildes)
int fildes;
{
int i;
char c, *cp;
char buffer[CMDBUFSIZE];
/* Read the reply command line. */
for (i = 0, cp = buffer; i < CMDBUFSIZE; i++, cp++)
{
if (read (READ (fildes), cp, 1) != 1)
{
_rmt_shutdown (fildes);
errno = EIO;
return -1;
}
if (*cp == '\n')
{
*cp = '\0';
break;
}
}
if (i == CMDBUFSIZE)
{
_rmt_shutdown (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);
/* Skip the error message line. */
while (read (READ (fildes), &c, 1) == 1)
if (c == '\n')
break;
if (*cp == 'F')
_rmt_shutdown (fildes);
return -1;
}
/* Check for mis-synced pipes. */
if (*cp != 'A')
{
_rmt_shutdown (fildes);
errno = EIO;
return -1;
}
/* Got an `A' (success) response. */
return atoi (cp + 1);
}
#ifdef USE_REXEC
/* Execute /etc/rmt as user USER on remote system HOST using rexec.
Return a file descriptor of a bidirectional socket for stdin and stdout.
If USER is NULL, or an empty string, use the current username.
By default, this code is not used, since it requires that
the user have a .netrc file in his/her home directory, or that the
application designer be willing to have rexec prompt for login and
password info. This may be unacceptable, and .rhosts files for use
with rsh are much more common on BSD systems. */
static int
_rmt_rexec (host, user)
char *host;
char *user;
{
struct servent *rexecserv;
int save_stdin = dup (fileno (stdin));
int save_stdout = dup (fileno (stdout));
int tape_fd; /* Return value. */
/* When using cpio -o < filename, stdin is no longer the tty.
But the rexec subroutine reads the login and the passwd on stdin,
to allow remote execution of the command.
So, reopen stdin and stdout on /dev/tty before the rexec and
give them back their original value after. */
if (freopen ("/dev/tty", "r", stdin) == NULL)
freopen ("/dev/null", "r", stdin);
if (freopen ("/dev/tty", "w", stdout) == NULL)
freopen ("/dev/null", "w", stdout);
rexecserv = getservbyname ("exec", "tcp");
if (NULL == rexecserv)
{
fprintf (stderr, "exec/tcp: service not available");
exit (1);
}
if (user != NULL && *user == '\0')
user = NULL;
tape_fd = rexec (&host, rexecserv->s_port, user, NULL,
"/etc/rmt", (int *) NULL);
fclose (stdin);
fdopen (save_stdin, "r");
fclose (stdout);
fdopen (save_stdout, "w");
return tape_fd;
}
#endif /* USE_REXEC */
/* Open a magtape device on the system specified in PATH, as the given user.
PATH has the form `[user@]system:/dev/????'.
If COMPAT is defined, it can also have the form `system[.user]:/dev/????'.
OFLAG is O_RDONLY, O_WRONLY, etc.
MODE is ignored; 0666 is always used.
If successful, return the remote tape pipe number plus BIAS.
On error, return -1. */
int
__rmt_open (path, oflag, mode, bias)
char *path;
int oflag;
int mode;
int bias;
{
int i, rc;
char buffer[CMDBUFSIZE]; /* Command buffer. */
char system[MAXHOSTLEN]; /* The remote host name. */
char device[CMDBUFSIZE]; /* The remote device name. */
char login[CMDBUFSIZE]; /* The remote user name. */
char *sys, *dev, *user; /* For copying into the above buffers. */
sys = system;
dev = device;
user = login;
/* Find an unused 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 the system and device, and optional user.
Don't munge the original string. */
while (*path != '@'
#ifdef COMPAT
&& *path != '.'
#endif
&& *path != ':')
{
*sys++ = *path++;
}
*sys = '\0';
path++;
if (*(path - 1) == '@')
{
/* Saw user part of user@host. Start over. */
strcpy (user, system);
sys = system;
while (*path != ':')
{
*sys++ = *path++;
}
*sys = '\0';
path++;
}
#ifdef COMPAT
else if (*(path - 1) == '.')
{
while (*path != ':')
{
*user++ = *path++;
}
*user = '\0';
path++;
}
#endif
else
*user = '\0';
while (*path)
{
*dev++ = *path++;
}
*dev = '\0';
#ifdef USE_REXEC
/* Execute the remote command using rexec. */
READ (i) = WRITE (i) = _rmt_rexec (system, login);
if (READ (i) < 0)
return -1;
#else /* !USE_REXEC */
/* Set up the pipes for the `rsh' command, and fork. */
if (pipe (to_rmt[i]) == -1 || pipe (from_rmt[i]) == -1)
return -1;
rc = fork ();
if (rc == -1)
return -1;
if (rc == 0)
{
/* Child. */
close (0);
dup (to_rmt[i][0]);
close (to_rmt[i][0]);
close (to_rmt[i][1]);
close (1);
dup (from_rmt[i][1]);
close (from_rmt[i][0]);
close (from_rmt[i][1]);
setuid (getuid ());
setgid (getgid ());
if (*login)
{
execl ("/usr/ucb/rsh", "rsh", system, "-l", login,
"/etc/rmt", (char *) 0);
execl ("/usr/bin/remsh", "remsh", system, "-l", login,
"/etc/rmt", (char *) 0);
execl ("/usr/bin/rsh", "rsh", system, "-l", login,
"/etc/rmt", (char *) 0);
execl ("/usr/bsd/rsh", "rsh", system, "-l", login,
"/etc/rmt", (char *) 0);
execl ("/usr/bin/nsh", "nsh", 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);
execl ("/usr/bin/rsh", "rsh", system,
"/etc/rmt", (char *) 0);
execl ("/usr/bsd/rsh", "rsh", system,
"/etc/rmt", (char *) 0);
execl ("/usr/bin/nsh", "nsh", system,
"/etc/rmt", (char *) 0);
}
/* Bad problems if we get here. */
perror ("cannot execute remote shell");
_exit (1);
}
/* Parent. */
close (to_rmt[i][0]);
close (from_rmt[i][1]);
#endif /* !USE_REXEC */
/* 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 + bias;
}
/* Close remote tape connection FILDES and shut down.
Return 0 if successful, -1 on error. */
int
__rmt_close (fildes)
int fildes;
{
int rc;
if (command (fildes, "C\n") == -1)
return -1;
rc = status (fildes);
_rmt_shutdown (fildes);
return rc;
}
/* Read up to NBYTE bytes into BUF from remote tape connection FILDES.
Return the number of bytes read on success, -1 on error. */
int
__rmt_read (fildes, buf, nbyte)
int fildes;
char *buf;
unsigned int nbyte;
{
int rc, i;
char buffer[CMDBUFSIZE];
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)
{
_rmt_shutdown (fildes);
errno = EIO;
return -1;
}
}
return rc;
}
/* Write NBYTE bytes from BUF to remote tape connection FILDES.
Return the number of bytes written on success, -1 on error. */
int
__rmt_write (fildes, buf, nbyte)
int fildes;
char *buf;
unsigned int nbyte;
{
char buffer[CMDBUFSIZE];
RETSIGTYPE (*pipe_handler) ();
sprintf (buffer, "W%d\n", nbyte);
if (command (fildes, buffer) == -1)
return -1;
pipe_handler = signal (SIGPIPE, SIG_IGN);
if (write (WRITE (fildes), buf, nbyte) == nbyte)
{
signal (SIGPIPE, pipe_handler);
return status (fildes);
}
/* Write error. */
signal (SIGPIPE, pipe_handler);
_rmt_shutdown (fildes);
errno = EIO;
return -1;
}
/* Perform an imitation lseek operation on remote tape connection FILDES.
Return the new file offset if successful, -1 if on error. */
long
__rmt_lseek (fildes, offset, whence)
int fildes;
long offset;
int whence;
{
char buffer[CMDBUFSIZE];
sprintf (buffer, "L%ld\n%d\n", offset, whence);
if (command (fildes, buffer) == -1)
return -1;
return status (fildes);
}
/* Perform a raw tape operation on remote tape connection FILDES.
Return the results of the ioctl, or -1 on error. */
#ifndef NO_MTIO
__rmt_ioctl (fildes, op, arg)
int fildes, op;
char *arg;
{
char c;
int rc, cnt;
char buffer[CMDBUFSIZE];
switch (op)
{
default:
errno = EINVAL;
return -1;
case MTIOCTOP:
/* MTIOCTOP is the easy one. Nothing is transfered in binary. */
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); /* Return the count. */
case MTIOCGET:
/* Grab the status and read it directly into the structure.
This assumes that the status buffer is not padded
and that 2 shorts fit in a long without any word
alignment problems; i.e., the whole struct is contiguous.
NOTE - this is probably NOT a good assumption. */
if (command (fildes, "S") == -1 || (rc = status (fildes)) == -1)
return -1;
for (; rc > 0; rc -= cnt, arg += cnt)
{
cnt = read (READ (fildes), arg, rc);
if (cnt <= 0)
{
_rmt_shutdown (fildes);
errno = EIO;
return -1;
}
}
/* 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 /* NO_MTIO */