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rmt.8
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rmt.c
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Editing: rmt.c
/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if 0 #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1983, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint static char sccsid[] = "@(#)rmt.c 8.1 (Berkeley) 6/6/93"; #endif /* not lint */ #endif #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); /* * rmt */ #include <sys/types.h> #include <sys/socket.h> #include <sys/mtio.h> #include <errno.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> static int tape = -1; static char *record; static int maxrecsize = -1; #define SSIZE 64 static char device[SSIZE]; static char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; static char resp[BUFSIZ]; static FILE *debug; #define DEBUG(f) if (debug) fprintf(debug, f) #define DEBUG1(f,a) if (debug) fprintf(debug, f, a) #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) static char *checkbuf(char *, int); static void error(int); static void getstring(char *); int main(int argc, char **argv) { int rval; char c; int n, i, cc; argc--, argv++; if (argc > 0) { debug = fopen(*argv, "w"); if (debug == NULL) { DEBUG1("rmtd: error to open %s\n", *argv); exit(1); } (void)setbuf(debug, (char *)0); } top: errno = 0; rval = 0; if (read(STDIN_FILENO, &c, 1) != 1) exit(0); switch (c) { case 'O': if (tape >= 0) (void) close(tape); getstring(device); getstring(mode); DEBUG2("rmtd: O %s %s\n", device, mode); /* * XXX the rmt protocol does not provide a means to * specify the permission bits; allow rw for everyone, * as modified by the users umask */ tape = open(device, atoi(mode), 0666); if (tape < 0) goto ioerror; goto respond; case 'C': DEBUG("rmtd: C\n"); getstring(device); /* discard */ if (close(tape) < 0) goto ioerror; tape = -1; goto respond; case 'L': getstring(count); getstring(pos); DEBUG2("rmtd: L %s %s\n", count, pos); rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos)); if (rval < 0) goto ioerror; goto respond; case 'W': getstring(count); n = atoi(count); DEBUG1("rmtd: W %s\n", count); record = checkbuf(record, n); for (i = 0; i < n; i += cc) { cc = read(STDIN_FILENO, &record[i], n - i); if (cc <= 0) { DEBUG("rmtd: premature eof\n"); exit(2); } } rval = write(tape, record, n); if (rval < 0) goto ioerror; goto respond; case 'R': getstring(count); DEBUG1("rmtd: R %s\n", count); n = atoi(count); record = checkbuf(record, n); rval = read(tape, record, n); if (rval < 0) goto ioerror; (void)sprintf(resp, "A%d\n", rval); (void)write(STDOUT_FILENO, resp, strlen(resp)); (void)write(STDOUT_FILENO, record, rval); goto top; case 'I': getstring(op); getstring(count); DEBUG2("rmtd: I %s %s\n", op, count); { struct mtop mtop; mtop.mt_op = atoi(op); mtop.mt_count = atoi(count); if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) goto ioerror; rval = mtop.mt_count; } goto respond; case 'S': /* status */ DEBUG("rmtd: S\n"); { struct mtget mtget; if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) goto ioerror; rval = sizeof (mtget); if (rval > 24) /* original mtget structure size */ rval = 24; (void)sprintf(resp, "A%d\n", rval); (void)write(STDOUT_FILENO, resp, strlen(resp)); (void)write(STDOUT_FILENO, (char *)&mtget, rval); goto top; } case 'V': /* version */ getstring(op); DEBUG1("rmtd: V %s\n", op); rval = 2; goto respond; default: DEBUG1("rmtd: garbage command %c\n", c); exit(3); } respond: DEBUG1("rmtd: A %d\n", rval); (void)sprintf(resp, "A%d\n", rval); (void)write(STDOUT_FILENO, resp, strlen(resp)); goto top; ioerror: error(errno); goto top; } void getstring(char *bp) { int i; char *cp = bp; for (i = 0; i < SSIZE; i++) { if (read(STDIN_FILENO, cp+i, 1) != 1) exit(0); if (cp[i] == '\n') break; } cp[i] = '\0'; } static char * checkbuf(char *rec, int size) { if (size <= maxrecsize) return (rec); if (rec != NULL) free(rec); rec = malloc(size); if (rec == NULL) { DEBUG("rmtd: cannot allocate buffer space\n"); exit(4); } maxrecsize = size; while (size > 1024 && setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) size -= 1024; return (rec); } static void error(int num) { DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); (void)write(STDOUT_FILENO, resp, strlen(resp)); }
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