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Diffstat (limited to 'gnu/usr.bin/tar/rtapelib.c')
| -rw-r--r-- | gnu/usr.bin/tar/rtapelib.c | 585 |
1 files changed, 0 insertions, 585 deletions
diff --git a/gnu/usr.bin/tar/rtapelib.c b/gnu/usr.bin/tar/rtapelib.c deleted file mode 100644 index 67fc919..0000000 --- a/gnu/usr.bin/tar/rtapelib.c +++ /dev/null @@ -1,585 +0,0 @@ -/* 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 -DHAVE_NETDB_H for rexec code, courtesy of Dan Kegel, srs!dan. */ - -/* $FreeBSD$ */ - -#include <stdio.h> -#include <sys/types.h> -#include <signal.h> - -#ifdef HAVE_SYS_MTIO_H -#include <sys/ioctl.h> -#include <sys/mtio.h> -#endif - -#ifdef HAVE_NETDB_H -#include <netdb.h> -#endif - -#include <errno.h> -#include <setjmp.h> -#include <sys/stat.h> - -#ifndef errno -extern int errno; -#endif - -#ifdef HAVE_UNISTD_H -#include <unistd.h> -#endif -#ifdef STDC_HEADERS -#include <string.h> -#include <stdlib.h> -#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 HAVE_NETDB_H -/* 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 /* HAVE_NETDB_H */ - -/* 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. */ - char *tar_rsh; - - 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 HAVE_NETDB_H - /* Execute the remote command using rexec. */ - READ (i) = WRITE (i) = _rmt_rexec (system, login); - if (READ (i) < 0) - return -1; -#else /* !HAVE_NETDB_H */ - /* 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 ()); - - tar_rsh = getenv("TAR_RSH"); - - if (*login) - { - if (tar_rsh) { - execlp (tar_rsh, tar_rsh, "-l", login, system, - "/etc/rmt", (char *) 0); - } else { - execl ("/usr/bin/rsh", "rsh", "-l", login, system, - "/etc/rmt", (char *) 0); - execlp ("rsh", "rsh", "-l", login, system, - "/etc/rmt", (char *) 0); - } - } - else - { - if (tar_rsh) { - execlp (tar_rsh, tar_rsh, system, - "/etc/rmt", (char *) 0); - } else { - execl ("/usr/bin/rsh", "rsh", system, - "/etc/rmt", (char *) 0); - execlp ("rsh", "rsh", 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 /* !HAVE_NETDB_H */ - - /* 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 - i); - 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. */ - -#ifdef MTIOCTOP -int -__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 |
