/* Functions for communicating with a remote tape drive.
- Copyright (C) 1988, 1992 Free Software Foundation, Inc.
+
+ Copyright 1988, 1992, 1994, 1996, 1997, 1999, 2000, 2001, 2004 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
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>
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 rmt* calls
+ into macros for speed by Jay Fenlason. Use -DWITH_REXEC for rexec
+ code, courtesy of Dan Kegel. */
+
+#include "system.h"
+#include "common.h"
+#include <safe-read.h>
+#include <full-write.h>
+
+/* Try hard to get EOPNOTSUPP defined. 486/ISC has it in net/errno.h,
+ 3B2/SVR3 has it in sys/inet.h. Otherwise, like on MSDOS, use EINVAL. */
+
+#ifndef EOPNOTSUPP
+# if HAVE_NET_ERRNO_H
+# include <net/errno.h>
+# endif
+# if HAVE_SYS_INET_H
+# include <sys/inet.h>
+# endif
+# ifndef EOPNOTSUPP
+# define EOPNOTSUPP EINVAL
+# endif
#endif
-#ifdef USE_REXEC
-#include <netdb.h>
-#endif
-
-#include <errno.h>
-#include <setjmp.h>
-#include <sys/stat.h>
+#include <signal.h>
-#ifndef errno
-extern int errno;
+#if HAVE_NETDB_H
+# include <netdb.h>
#endif
-/* Maximum size of a fully qualified host name. */
-#define MAXHOSTLEN 257
+#include "rmt.h"
-/* Size of buffers for reading and writing commands to rmt.
- (An arbitrary limit.) */
-#define CMDBUFSIZE 64
+/* Exit status if exec errors. */
+#define EXIT_ON_EXEC_ERROR 128
+
+/* FIXME: Size of buffers for reading and writing commands to rmt. */
+#define COMMAND_BUFFER_SIZE 64
#ifndef RETSIGTYPE
-#define RETSIGTYPE void
+# define RETSIGTYPE void
#endif
-/* Maximum number of simultaneous remote tape connections.
- (Another arbitrary limit.) */
+/* FIXME: Maximum number of simultaneous remote tape connections. */
#define MAXUNIT 4
-/* Return the parent's read side of remote tape connection FILDES. */
-#define READ(fildes) (from_rmt[fildes][0])
+#define PREAD 0 /* read file descriptor from pipe() */
+#define PWRITE 1 /* write file descriptor from pipe() */
+
+/* Return the parent's read side of remote tape connection Fd. */
+#define READ_SIDE(Fd) (from_remote[Fd][PREAD])
-/* Return the parent's write side of remote tape connection FILDES. */
-#define WRITE(fildes) (to_rmt[fildes][1])
+/* Return the parent's write side of remote tape connection Fd. */
+#define WRITE_SIDE(Fd) (to_remote[Fd][PWRITE])
/* The pipes for receiving data from remote tape drives. */
-static int from_rmt[MAXUNIT][2] = {-1, -1, -1, -1, -1, -1, -1, -1};
+static int from_remote[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};
+static int to_remote[MAXUNIT][2] = {{-1, -1}, {-1, -1}, {-1, -1}, {-1, -1}};
/* Temporary variable used by macros in rmt.h. */
-char *__rmt_path;
+char *rmt_path__;
\f
-/* Close remote tape connection FILDES. */
-static void
-_rmt_shutdown (fildes)
- int fildes;
+/* Close remote tape connection HANDLE, and reset errno to ERRNO_VALUE. */
+static void
+_rmt_shutdown (int handle, int errno_value)
{
- close (READ (fildes));
- close (WRITE (fildes));
- READ (fildes) = -1;
- WRITE (fildes) = -1;
+ close (READ_SIDE (handle));
+ close (WRITE_SIDE (handle));
+ READ_SIDE (handle) = -1;
+ WRITE_SIDE (handle) = -1;
+ errno = errno_value;
}
-/* 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;
+/* Attempt to perform the remote tape command specified in BUFFER on
+ remote tape connection HANDLE. Return 0 if successful, -1 on
+ error. */
+static int
+do_command (int handle, const char *buffer)
{
- 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;
- }
+ size_t length = strlen (buffer);
+ RETSIGTYPE (*pipe_handler) () = signal (SIGPIPE, SIG_IGN);
+ ssize_t written = full_write (WRITE_SIDE (handle), buffer, length);
+ signal (SIGPIPE, pipe_handler);
+
+ if (written == length)
+ return 0;
/* Something went wrong. Close down and go home. */
- signal (SIGPIPE, pipe_handler);
- _rmt_shutdown (fildes);
- errno = EIO;
+ _rmt_shutdown (handle, 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;
+static char *
+get_status_string (int handle, char *command_buffer)
{
- int i;
- char c, *cp;
- char buffer[CMDBUFSIZE];
+ char *cursor;
+ int counter;
/* Read the reply command line. */
- for (i = 0, cp = buffer; i < CMDBUFSIZE; i++, cp++)
+ for (counter = 0, cursor = command_buffer;
+ counter < COMMAND_BUFFER_SIZE;
+ counter++, cursor++)
{
- if (read (READ (fildes), cp, 1) != 1)
+ if (safe_read (READ_SIDE (handle), cursor, 1) != 1)
{
- _rmt_shutdown (fildes);
- errno = EIO;
- return -1;
+ _rmt_shutdown (handle, EIO);
+ return 0;
}
- if (*cp == '\n')
+ if (*cursor == '\n')
{
- *cp = '\0';
+ *cursor = '\0';
break;
}
}
- if (i == CMDBUFSIZE)
+ if (counter == COMMAND_BUFFER_SIZE)
{
- _rmt_shutdown (fildes);
- errno = EIO;
- return -1;
+ _rmt_shutdown (handle, EIO);
+ return 0;
}
/* Check the return status. */
- for (cp = buffer; *cp; cp++)
- if (*cp != ' ')
+ for (cursor = command_buffer; *cursor; cursor++)
+ if (*cursor != ' ')
break;
- if (*cp == 'E' || *cp == 'F')
+ if (*cursor == 'E' || *cursor == '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);
+ /* FIXME: there is better to do than merely ignoring error messages
+ coming from the remote end. Translate them, too... */
- return -1;
+ {
+ char character;
+
+ while (safe_read (READ_SIDE (handle), &character, 1) == 1)
+ if (character == '\n')
+ break;
+ }
+
+ errno = atoi (cursor + 1);
+
+ if (*cursor == 'F')
+ _rmt_shutdown (handle, errno);
+
+ return 0;
}
- /* Check for mis-synced pipes. */
+ /* Check for mis-synced pipes. */
- if (*cp != 'A')
+ if (*cursor != 'A')
{
- _rmt_shutdown (fildes);
- errno = EIO;
- return -1;
+ _rmt_shutdown (handle, EIO);
+ return 0;
}
/* Got an `A' (success) response. */
- return atoi (cp + 1);
+
+ return cursor + 1;
+}
+
+/* Read and return the status from remote tape connection HANDLE. If
+ an error occurred, return -1 and set errno. */
+static long int
+get_status (int handle)
+{
+ char command_buffer[COMMAND_BUFFER_SIZE];
+ const char *status = get_status_string (handle, command_buffer);
+ if (status)
+ {
+ long int result = atol (status);
+ if (0 <= result)
+ return result;
+ errno = EIO;
+ }
+ return -1;
+}
+
+static off_t
+get_status_off (int handle)
+{
+ char command_buffer[COMMAND_BUFFER_SIZE];
+ const char *status = get_status_string (handle, command_buffer);
+
+ if (! status)
+ return -1;
+ else
+ {
+ /* Parse status, taking care to check for overflow.
+ We can't use standard functions,
+ since off_t might be longer than long. */
+
+ off_t count = 0;
+ int negative;
+
+ for (; *status == ' ' || *status == '\t'; status++)
+ continue;
+
+ negative = *status == '-';
+ status += negative || *status == '+';
+
+ for (;;)
+ {
+ int digit = *status++ - '0';
+ if (9 < (unsigned) digit)
+ break;
+ else
+ {
+ off_t c10 = 10 * count;
+ off_t nc = negative ? c10 - digit : c10 + digit;
+ if (c10 / 10 != count || (negative ? c10 < nc : nc < c10))
+ return -1;
+ count = nc;
+ }
+ }
+
+ return count;
+ }
}
-#ifdef USE_REXEC
+#if WITH_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.
+ Return a file descriptor of a bidirectional socket for stdin and
+ stdout. If USER is zero, 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
+ 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;
+_rmt_rexec (char *host, char *user)
{
+ int saved_stdin = dup (STDIN_FILENO);
+ int saved_stdout = dup (STDOUT_FILENO);
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)
+ int result;
+
+ /* 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))
freopen ("/dev/null", "r", stdin);
- if (freopen ("/dev/tty", "w", stdout) == NULL)
+ if (! freopen ("/dev/tty", "w", stdout))
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 */
+ if (rexecserv = getservbyname ("exec", "tcp"), !rexecserv)
+ error (EXIT_ON_EXEC_ERROR, 0, _("exec/tcp: Service not available"));
-/* 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/????'.
+ result = rexec (&host, rexecserv->s_port, user, 0, "/etc/rmt", 0);
+ if (fclose (stdin) == EOF)
+ error (0, errno, _("stdin"));
+ fdopen (saved_stdin, "r");
+ if (fclose (stdout) == EOF)
+ error (0, errno, _("stdout"));
+ fdopen (saved_stdout, "w");
- OFLAG is O_RDONLY, O_WRONLY, etc.
- MODE is ignored; 0666 is always used.
+ return result;
+}
- If successful, return the remote tape pipe number plus BIAS.
- On error, return -1. */
+#endif /* WITH_REXEC */
-int
-__rmt_open (path, oflag, mode, bias)
- char *path;
- int oflag;
- int mode;
- int bias;
+/* Place into BUF a string representing OFLAG, which must be suitable
+ as argument 2 of `open'. BUF must be large enough to hold the
+ result. This function should generate a string that decode_oflag
+ can parse. */
+static void
+encode_oflag (char *buf, int oflag)
{
- 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. */
+ sprintf (buf, "%d ", oflag);
- sys = system;
- dev = device;
- user = login;
+ switch (oflag & O_ACCMODE)
+ {
+ case O_RDONLY: strcat (buf, "O_RDONLY"); break;
+ case O_RDWR: strcat (buf, "O_RDWR"); break;
+ case O_WRONLY: strcat (buf, "O_WRONLY"); break;
+ default: abort ();
+ }
+
+#ifdef O_APPEND
+ if (oflag & O_APPEND) strcat (buf, "|O_APPEND");
+#endif
+ if (oflag & O_CREAT) strcat (buf, "|O_CREAT");
+#ifdef O_DSYNC
+ if (oflag & O_DSYNC) strcat (buf, "|O_DSYNC");
+#endif
+ if (oflag & O_EXCL) strcat (buf, "|O_EXCL");
+#ifdef O_LARGEFILE
+ if (oflag & O_LARGEFILE) strcat (buf, "|O_LARGEFILE");
+#endif
+#ifdef O_NOCTTY
+ if (oflag & O_NOCTTY) strcat (buf, "|O_NOCTTY");
+#endif
+#ifdef O_NONBLOCK
+ if (oflag & O_NONBLOCK) strcat (buf, "|O_NONBLOCK");
+#endif
+#ifdef O_RSYNC
+ if (oflag & O_RSYNC) strcat (buf, "|O_RSYNC");
+#endif
+#ifdef O_SYNC
+ if (oflag & O_SYNC) strcat (buf, "|O_SYNC");
+#endif
+ if (oflag & O_TRUNC) strcat (buf, "|O_TRUNC");
+}
+
+/* Open a file (a magnetic tape device?) on the system specified in
+ PATH, as the given user. PATH has the form `[USER@]HOST:FILE'.
+ OPEN_MODE is O_RDONLY, O_WRONLY, etc. If successful, return the
+ remote pipe number plus BIAS. REMOTE_SHELL may be overridden. On
+ error, return -1. */
+int
+rmt_open__ (const char *path, int open_mode, int bias, const char *remote_shell)
+{
+ int remote_pipe_number; /* pseudo, biased file descriptor */
+ char *path_copy ; /* copy of path string */
+ char *remote_host; /* remote host name */
+ char *remote_file; /* remote file name (often a device) */
+ char *remote_user; /* remote user name */
/* Find an unused pair of file descriptors. */
- for (i = 0; i < MAXUNIT; i++)
- if (READ (i) == -1 && WRITE (i) == -1)
+ for (remote_pipe_number = 0;
+ remote_pipe_number < MAXUNIT;
+ remote_pipe_number++)
+ if (READ_SIDE (remote_pipe_number) == -1
+ && WRITE_SIDE (remote_pipe_number) == -1)
break;
- if (i == MAXUNIT)
+ if (remote_pipe_number == MAXUNIT)
{
errno = EMFILE;
return -1;
}
- /* Pull apart the system and device, and optional user.
- Don't munge the original string. */
+ /* Pull apart the system and device, and optional user. */
- while (*path != '@'
-#ifdef COMPAT
- && *path != '.'
-#endif
- && *path != ':')
- {
- *sys++ = *path++;
- }
- *sys = '\0';
- path++;
+ {
+ char *cursor;
- 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 != ':')
+ path_copy = xstrdup (path);
+ remote_host = path_copy;
+ remote_user = 0;
+ remote_file = 0;
+
+ for (cursor = path_copy; *cursor; cursor++)
+ switch (*cursor)
{
- *user++ = *path++;
+ default:
+ break;
+
+ case '\n':
+ /* Do not allow newlines in the path, since the protocol
+ uses newline delimiters. */
+ free (path_copy);
+ errno = ENOENT;
+ return -1;
+
+ case '@':
+ if (!remote_user)
+ {
+ remote_user = remote_host;
+ *cursor = '\0';
+ remote_host = cursor + 1;
+ }
+ break;
+
+ case ':':
+ if (!remote_file)
+ {
+ *cursor = '\0';
+ remote_file = cursor + 1;
+ }
+ break;
}
- *user = '\0';
- path++;
- }
-#endif
- else
- *user = '\0';
+ }
+
+ /* FIXME: Should somewhat validate the decoding, here. */
+
+ if (remote_user && *remote_user == '\0')
+ remote_user = 0;
+
+#if WITH_REXEC
+
+ /* Execute the remote command using rexec. */
- while (*path)
+ READ_SIDE (remote_pipe_number) = _rmt_rexec (remote_host, remote_user);
+ if (READ_SIDE (remote_pipe_number) < 0)
{
- *dev++ = *path++;
+ int e = errno;
+ free (path_copy);
+ errno = e;
+ return -1;
}
- *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. */
+ WRITE_SIDE (remote_pipe_number) = READ_SIDE (remote_pipe_number);
- if (pipe (to_rmt[i]) == -1 || pipe (from_rmt[i]) == -1)
- return -1;
+#else /* not WITH_REXEC */
+ {
+ const char *remote_shell_basename;
+ pid_t status;
- rc = fork ();
- if (rc == -1)
- return -1;
+ /* Identify the remote command to be executed. */
- if (rc == 0)
- {
- /* Child. */
- close (0);
- dup (to_rmt[i][0]);
- close (to_rmt[i][0]);
- close (to_rmt[i][1]);
+ if (!remote_shell)
+ {
+#ifdef REMOTE_SHELL
+ remote_shell = REMOTE_SHELL;
+#else
+ free (path_copy);
+ errno = EIO;
+ return -1;
+#endif
+ }
+ remote_shell_basename = base_name (remote_shell);
- close (1);
- dup (from_rmt[i][1]);
- close (from_rmt[i][0]);
- close (from_rmt[i][1]);
+ /* Set up the pipes for the `rsh' command, and fork. */
- setuid (getuid ());
- setgid (getgid ());
+ if (pipe (to_remote[remote_pipe_number]) == -1
+ || pipe (from_remote[remote_pipe_number]) == -1)
+ {
+ int e = errno;
+ free (path_copy);
+ errno = e;
+ return -1;
+ }
+
+ status = fork ();
+ if (status == -1)
+ {
+ int e = errno;
+ free (path_copy);
+ errno = e;
+ return -1;
+ }
- 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,
+ if (status == 0)
+ {
+ /* Child. */
+
+ close (STDIN_FILENO);
+ dup (to_remote[remote_pipe_number][PREAD]);
+ close (to_remote[remote_pipe_number][PREAD]);
+ close (to_remote[remote_pipe_number][PWRITE]);
+
+ close (STDOUT_FILENO);
+ dup (from_remote[remote_pipe_number][PWRITE]);
+ close (from_remote[remote_pipe_number][PREAD]);
+ close (from_remote[remote_pipe_number][PWRITE]);
+
+ sys_reset_uid_gid ();
+
+ if (remote_user)
+ execl (remote_shell, remote_shell_basename, remote_host,
+ "-l", remote_user, "/etc/rmt", (char *) 0);
+ else
+ execl (remote_shell, remote_shell_basename, remote_host,
"/etc/rmt", (char *) 0);
- }
- /* Bad problems if we get here. */
+ /* Bad problems if we get here. */
- perror ("cannot execute remote shell");
- _exit (1);
- }
+ /* In a previous version, _exit was used here instead of exit. */
+ error (EXIT_ON_EXEC_ERROR, errno, _("Cannot execute remote shell"));
+ }
+
+ /* Parent. */
- /* Parent. */
- close (to_rmt[i][0]);
- close (from_rmt[i][1]);
-#endif /* !USE_REXEC */
+ close (from_remote[remote_pipe_number][PWRITE]);
+ close (to_remote[remote_pipe_number][PREAD]);
+ }
+#endif /* not WITH_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;
+ {
+ size_t remote_file_len = strlen (remote_file);
+ char *command_buffer = xmalloc (remote_file_len + 1000);
+ sprintf (command_buffer, "O%s\n", remote_file);
+ encode_oflag (command_buffer + remote_file_len + 2, open_mode);
+ strcat (command_buffer, "\n");
+ if (do_command (remote_pipe_number, command_buffer) == -1
+ || get_status (remote_pipe_number) == -1)
+ {
+ int e = errno;
+ free (command_buffer);
+ free (path_copy);
+ _rmt_shutdown (remote_pipe_number, e);
+ return -1;
+ }
+ free (command_buffer);
+ }
- return i + bias;
+ free (path_copy);
+ return remote_pipe_number + bias;
}
-/* Close remote tape connection FILDES and shut down.
- Return 0 if successful, -1 on error. */
-
-int
-__rmt_close (fildes)
- int fildes;
+/* Close remote tape connection HANDLE and shut down. Return 0 if
+ successful, -1 on error. */
+int
+rmt_close__ (int handle)
{
- int rc;
+ long int status;
- if (command (fildes, "C\n") == -1)
+ if (do_command (handle, "C\n") == -1)
return -1;
- rc = status (fildes);
- _rmt_shutdown (fildes);
- return rc;
+ status = get_status (handle);
+ _rmt_shutdown (handle, errno);
+ return status;
}
-/* 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;
+/* Read up to LENGTH bytes into BUFFER from remote tape connection HANDLE.
+ Return the number of bytes read on success, SAFE_READ_ERROR on error. */
+size_t
+rmt_read__ (int handle, char *buffer, size_t length)
{
- int rc, i;
- char buffer[CMDBUFSIZE];
+ char command_buffer[COMMAND_BUFFER_SIZE];
+ size_t status;
+ size_t rlen;
+ size_t counter;
- sprintf (buffer, "R%d\n", nbyte);
- if (command (fildes, buffer) == -1 || (rc = status (fildes)) == -1)
- return -1;
+ sprintf (command_buffer, "R%lu\n", (unsigned long) length);
+ if (do_command (handle, command_buffer) == -1
+ || (status = get_status (handle)) == SAFE_READ_ERROR)
+ return SAFE_READ_ERROR;
- for (i = 0; i < rc; i += nbyte, buf += nbyte)
+ for (counter = 0; counter < status; counter += rlen, buffer += rlen)
{
- nbyte = read (READ (fildes), buf, rc);
- if (nbyte <= 0)
+ rlen = safe_read (READ_SIDE (handle), buffer, status - counter);
+ if (rlen == SAFE_READ_ERROR || rlen == 0)
{
- _rmt_shutdown (fildes);
- errno = EIO;
- return -1;
+ _rmt_shutdown (handle, EIO);
+ return SAFE_READ_ERROR;
}
}
- return rc;
+ return status;
}
-/* 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;
+/* Write LENGTH bytes from BUFFER to remote tape connection HANDLE.
+ Return the number of bytes written. */
+size_t
+rmt_write__ (int handle, char *buffer, size_t length)
{
- char buffer[CMDBUFSIZE];
+ char command_buffer[COMMAND_BUFFER_SIZE];
RETSIGTYPE (*pipe_handler) ();
+ size_t written;
- sprintf (buffer, "W%d\n", nbyte);
- if (command (fildes, buffer) == -1)
- return -1;
+ sprintf (command_buffer, "W%lu\n", (unsigned long) length);
+ if (do_command (handle, command_buffer) == -1)
+ return 0;
pipe_handler = signal (SIGPIPE, SIG_IGN);
- if (write (WRITE (fildes), buf, nbyte) == nbyte)
+ written = full_write (WRITE_SIDE (handle), buffer, length);
+ signal (SIGPIPE, pipe_handler);
+ if (written == length)
{
- signal (SIGPIPE, pipe_handler);
- return status (fildes);
+ long int r = get_status (handle);
+ if (r < 0)
+ return 0;
+ if (r == length)
+ return length;
+ written = r;
}
/* 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. */
+ _rmt_shutdown (handle, EIO);
+ return written;
+}
-long
-__rmt_lseek (fildes, offset, whence)
- int fildes;
- long offset;
- int whence;
+/* Perform an imitation lseek operation on remote tape connection
+ HANDLE. Return the new file offset if successful, -1 if on error. */
+off_t
+rmt_lseek__ (int handle, off_t offset, int whence)
{
- char buffer[CMDBUFSIZE];
+ char command_buffer[COMMAND_BUFFER_SIZE];
+ char operand_buffer[UINTMAX_STRSIZE_BOUND];
+ uintmax_t u = offset < 0 ? - (uintmax_t) offset : (uintmax_t) offset;
+ char *p = operand_buffer + sizeof operand_buffer;
+
+ *--p = 0;
+ do
+ *--p = '0' + (int) (u % 10);
+ while ((u /= 10) != 0);
+ if (offset < 0)
+ *--p = '-';
+
+ switch (whence)
+ {
+ case SEEK_SET: whence = 0; break;
+ case SEEK_CUR: whence = 1; break;
+ case SEEK_END: whence = 2; break;
+ default: abort ();
+ }
- sprintf (buffer, "L%ld\n%d\n", offset, whence);
- if (command (fildes, buffer) == -1)
+ sprintf (command_buffer, "L%s\n%d\n", p, whence);
+
+ if (do_command (handle, command_buffer) == -1)
return -1;
- return status (fildes);
+ return get_status_off (handle);
}
-/* Perform a raw tape operation on remote tape connection FILDES.
+/* Perform a raw tape operation on remote tape connection HANDLE.
Return the results of the ioctl, or -1 on error. */
-
-#ifndef NO_MTIO
-__rmt_ioctl (fildes, op, arg)
- int fildes, op;
- char *arg;
+int
+rmt_ioctl__ (int handle, int operation, char *argument)
{
- char c;
- int rc, cnt;
- char buffer[CMDBUFSIZE];
-
- switch (op)
+ switch (operation)
{
default:
- errno = EINVAL;
+ errno = EOPNOTSUPP;
return -1;
+#ifdef MTIOCTOP
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. */
+ {
+ char command_buffer[COMMAND_BUFFER_SIZE];
+ char operand_buffer[UINTMAX_STRSIZE_BOUND];
+ uintmax_t u = (((struct mtop *) argument)->mt_count < 0
+ ? - (uintmax_t) ((struct mtop *) argument)->mt_count
+ : (uintmax_t) ((struct mtop *) argument)->mt_count);
+ char *p = operand_buffer + sizeof operand_buffer;
+
+ *--p = 0;
+ do
+ *--p = '0' + (int) (u % 10);
+ while ((u /= 10) != 0);
+ if (((struct mtop *) argument)->mt_count < 0)
+ *--p = '-';
+
+ /* MTIOCTOP is the easy one. Nothing is transferred in binary. */
+
+ sprintf (command_buffer, "I%d\n%s\n",
+ ((struct mtop *) argument)->mt_op, p);
+ if (do_command (handle, command_buffer) == -1)
+ return -1;
+
+ return get_status (handle);
+ }
+#endif /* MTIOCTOP */
+#ifdef MTIOCGET
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. */
+ {
+ ssize_t status;
+ size_t counter;
+
+ /* 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 (do_command (handle, "S") == -1
+ || (status = get_status (handle), status == -1))
+ return -1;
- if (command (fildes, "S") == -1 || (rc = status (fildes)) == -1)
- return -1;
+ for (; status > 0; status -= counter, argument += counter)
+ {
+ counter = safe_read (READ_SIDE (handle), argument, status);
+ if (counter == SAFE_READ_ERROR || counter == 0)
+ {
+ _rmt_shutdown (handle, EIO);
+ 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 (or mt_model) 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. */
- /* 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 *) argument)->MTIO_CHECK_FIELD < 256)
+ return 0;
- if (((struct mtget *) arg)->mt_type < 256)
- return 0;
+ for (counter = 0; counter < status; counter += 2)
+ {
+ char copy = argument[counter];
- for (cnt = 0; cnt < rc; cnt += 2)
- {
- c = arg[cnt];
- arg[cnt] = arg[cnt + 1];
- arg[cnt + 1] = c;
- }
+ argument[counter] = argument[counter + 1];
+ argument[counter + 1] = copy;
+ }
+
+ return 0;
+ }
+#endif /* MTIOCGET */
- return 0;
}
}
-#endif /* NO_MTIO */
projects / chaz / tar / blobdiff