dcdf7ba2cd
version 0 RMT protocol, the query of status makes no sense (send back, in binary, the mtget structure), but systems sometimes use it anyway. And when they use it, they get upset if they get back something that is a different size from what they expect. The original mtget structure in BSD 4.3 is 24 bytes in size, and that seems to be what they can cope with. The correct fix would be to go to Version 1 RMT, but that's a horse of another color...
262 lines
6.1 KiB
C
262 lines
6.1 KiB
C
/* $NetBSD: rmt.c,v 1.10 2000/02/08 18:00:05 mjacob Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)rmt.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: rmt.c,v 1.10 2000/02/08 18:00:05 mjacob Exp $");
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#endif
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#endif /* not lint */
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/*
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* rmt
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/mtio.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int tape = -1;
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char *record;
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int maxrecsize = -1;
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#define SSIZE 64
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char device[SSIZE];
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char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
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char resp[BUFSIZ];
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FILE *debug;
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#define DEBUG(f) if (debug) fprintf(debug, f)
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#define DEBUG1(f,a) if (debug) fprintf(debug, f, a)
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#define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
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char *checkbuf __P((char *, int));
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void error __P((int));
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int main __P((int, char **));
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void getstring __P((char *));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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int rval;
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char c;
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int n, i, cc;
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argc--, argv++;
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if (argc > 0) {
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debug = fopen(*argv, "w");
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if (debug == 0)
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exit(1);
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(void)setbuf(debug, (char *)0);
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}
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top:
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errno = 0;
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rval = 0;
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if (read(STDIN_FILENO, &c, 1) != 1)
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exit(0);
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switch (c) {
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case 'O':
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if (tape >= 0)
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(void) close(tape);
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getstring(device);
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getstring(mode);
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DEBUG2("rmtd: O %s %s\n", device, mode);
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tape = open(device, atoi(mode),
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S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
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if (tape < 0)
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goto ioerror;
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goto respond;
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case 'C':
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DEBUG("rmtd: C\n");
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getstring(device); /* discard */
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if (close(tape) < 0)
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goto ioerror;
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tape = -1;
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goto respond;
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case 'L':
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getstring(count);
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getstring(pos);
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DEBUG2("rmtd: L %s %s\n", count, pos);
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rval = lseek(tape, (off_t)strtoq(count, NULL, 10), atoi(pos));
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if (rval < 0)
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goto ioerror;
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goto respond;
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case 'W':
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getstring(count);
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n = atoi(count);
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DEBUG1("rmtd: W %s\n", count);
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record = checkbuf(record, n);
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for (i = 0; i < n; i += cc) {
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cc = read(STDIN_FILENO, &record[i], n - i);
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if (cc <= 0) {
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DEBUG("rmtd: premature eof\n");
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exit(2);
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}
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}
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rval = write(tape, record, n);
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if (rval < 0)
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goto ioerror;
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goto respond;
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case 'R':
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getstring(count);
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DEBUG1("rmtd: R %s\n", count);
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n = atoi(count);
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record = checkbuf(record, n);
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rval = read(tape, record, n);
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if (rval < 0)
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goto ioerror;
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(void)sprintf(resp, "A%d\n", rval);
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(void)write(STDOUT_FILENO, resp, strlen(resp));
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(void)write(STDOUT_FILENO, record, rval);
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goto top;
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case 'I':
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getstring(op);
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getstring(count);
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DEBUG2("rmtd: I %s %s\n", op, count);
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{
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struct mtop mtop;
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mtop.mt_op = atoi(op);
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mtop.mt_count = atoi(count);
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if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
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goto ioerror;
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rval = mtop.mt_count;
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}
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goto respond;
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case 'S': /* status */
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DEBUG("rmtd: S\n");
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{
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struct mtget mtget;
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if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
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goto ioerror;
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rval = sizeof (mtget);
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/* limit size to 'original' mtget size */
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if (rval > 24)
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rval = 24;
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(void)sprintf(resp, "A%d\n", rval);
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(void)write(STDOUT_FILENO, resp, strlen(resp));
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(void)write(STDOUT_FILENO, (char *)&mtget, rval);
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goto top;
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}
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default:
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DEBUG1("rmtd: garbage command %c\n", c);
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exit(3);
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}
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respond:
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DEBUG1("rmtd: A %d\n", rval);
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(void)sprintf(resp, "A%d\n", rval);
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(void)write(STDOUT_FILENO, resp, strlen(resp));
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goto top;
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ioerror:
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error(errno);
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goto top;
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}
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void
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getstring(bp)
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char *bp;
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{
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int i;
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char *cp = bp;
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for (i = 0; i < SSIZE - 1; i++) {
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if (read(STDIN_FILENO, cp+i, 1) != 1)
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exit(0);
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if (cp[i] == '\n')
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break;
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}
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cp[i] = '\0';
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}
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char *
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checkbuf(record, size)
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char *record;
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int size;
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{
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if (size <= maxrecsize)
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return (record);
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if (record != 0)
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free(record);
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record = malloc(size);
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if (record == 0) {
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DEBUG("rmtd: cannot allocate buffer space\n");
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exit(4);
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}
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maxrecsize = size;
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while (size > 1024 &&
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setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
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size -= 1024;
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return (record);
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}
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void
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error(num)
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int num;
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{
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DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
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(void)sprintf(resp, "E%d\n%s\n", num, strerror(num));
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(void)write(STDOUT_FILENO, resp, strlen(resp));
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}
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