GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/rmt/rmt.c Lines: 0 144 0.0 %
Date: 2017-11-13 Branches: 0 116 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: rmt.c,v 1.20 2016/08/14 18:34:48 guenther Exp $	*/
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/*
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 * Copyright (c) 1983 Regents of the University of California.
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 * 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. 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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/*
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 * rmt
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 */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/mtio.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <err.h>
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#include <errno.h>
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#include <string.h>
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#include <limits.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	STRSIZE	64
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char	device[PATH_MAX];
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char	lastdevice[PATH_MAX] = "";
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char	count[STRSIZE], mode[STRSIZE], pos[STRSIZE], op[STRSIZE];
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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(char *, int);
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void		getstring(char *, int);
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void		error(int);
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__dead void	usage(void);
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int
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main(int argc, char *argv[])
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{
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	off_t orval;
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	int rval;
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	char c;
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	int n, i, cc;
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	int ch, rflag = 0, wflag = 0;
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	int f, acc;
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	mode_t m;
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	char *dir = NULL;
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	char *devp;
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	size_t dirlen;
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	if (pledge("stdio rpath wpath cpath inet flock", NULL) == -1)
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		err(1, "pledge");
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	while ((ch = getopt(argc, argv, "d:rw")) != -1) {
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		switch (ch) {
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		case 'd':
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			dir = optarg;
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			if (*dir != '/')
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				errx(1, "directory must be absolute");
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			break;
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		case 'r':
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			rflag = 1;
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			break;
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		case 'w':
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			wflag = 1;
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			break;
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		default:
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			usage();
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			/* NOTREACHED */
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		}
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	}
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	argc -= optind;
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	argv += optind;
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	if (rflag && wflag)
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		usage();
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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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			err(1, "cannot open debug file");
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		setvbuf(debug, NULL, _IONBF, 0);
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	}
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	if (dir) {
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		if (chdir(dir) != 0)
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			err(1, "chdir");
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		dirlen = strlen(dir);
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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, sizeof(device));
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		getstring(mode, sizeof(mode));
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		DEBUG2("rmtd: O %s %s\n", device, mode);
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		devp = device;
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		f = atoi(mode);
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		m = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
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		acc = f & O_ACCMODE;
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		if (dir) {
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			/* Strip away valid directory prefix. */
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			if (strncmp(dir, devp, dirlen) == 0 &&
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			    (devp[dirlen - 1] == '/' ||
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			     devp[dirlen] == '/')) {
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			     devp += dirlen;
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			     while (*devp == '/')
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				devp++;
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			}
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			/* Don't allow directory traversal. */
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			if (strchr(devp, '/')) {
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				errno = EACCES;
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				goto ioerror;
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			}
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			f |= O_NOFOLLOW;
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		}
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		if (rflag) {
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			/*
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			 * Only allow readonly open and ignore file
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			 * creation requests.
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			 */
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			if (acc != O_RDONLY) {
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				errno = EPERM;
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				goto ioerror;
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			}
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			f &= ~O_CREAT;
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		} else if (wflag) {
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			/*
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			 * Require, and force creation of, a nonexistant file,
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			 * unless we are reopening the last opened file again,
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			 * in which case it is opened read-only.
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			 */
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			if (strcmp(devp, lastdevice) != 0) {
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				/*
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				 * Disallow read-only open since that would
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				 * only result in an empty file.
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				 */
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				if (acc == O_RDONLY) {
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					errno = EPERM;
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					goto ioerror;
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				}
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				f |= O_CREAT | O_EXCL;
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			} else {
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				acc = O_RDONLY;
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			}
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			/* Create readonly file */
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			m = S_IRUSR|S_IRGRP|S_IROTH;
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		}
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		/* Apply new access mode. */
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		f = (f & ~O_ACCMODE) | acc;
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		tape = open(devp, f, m);
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		if (tape == -1)
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			goto ioerror;
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		(void)strlcpy(lastdevice, devp, sizeof(lastdevice));
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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, sizeof(device));	/* discard */
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		if (close(tape) == -1)
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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, sizeof(count));
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		getstring(pos, sizeof(pos));
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		DEBUG2("rmtd: L %s %s\n", count, pos);
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		orval = lseek(tape, strtoll(count, NULL, 0), atoi(pos));
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		if (orval == -1)
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			goto ioerror;
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		goto respond;
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	case 'W':
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		getstring(count, sizeof(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, sizeof(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) snprintf(resp, sizeof 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, sizeof(op));
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		getstring(count, sizeof(count));
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		DEBUG2("rmtd: I %s %s\n", op, count);
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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) == -1)
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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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		{ struct mtget mtget;
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		  if (ioctl(tape, MTIOCGET, (char *)&mtget) == -1)
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			goto ioerror;
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		  rval = sizeof (mtget);
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		  (void) snprintf(resp, sizeof 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, sizeof (mtget));
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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) snprintf(resp, sizeof 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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286
void
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getstring(char *bp, int size)
288
{
289
	char *cp = bp;
290
	char *ep = bp + size - 1;
291
292
	do {
293
		if (read(STDIN_FILENO, cp, 1) != 1)
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			exit(0);
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	} while (*cp != '\n' && ++cp < ep);
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	*cp = '\0';
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}
298
299
char *
300
checkbuf(char *record, int size)
301
{
302
	if (size <= maxrecsize)
303
		return (record);
304
	if (record != 0)
305
		free(record);
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	record = malloc(size);
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	if (record == 0) {
308
		DEBUG("rmtd: cannot allocate buffer space\n");
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		exit(4);
310
	}
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	maxrecsize = size;
312
	while (size > 1024 &&
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	    setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) == -1)
314
		size -= 1024;
315
	return (record);
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}
317
318
void
319
error(int num)
320
{
321
322
	DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
323
	(void) snprintf(resp, sizeof (resp), "E%d\n%s\n", num, strerror(num));
324
	(void) write(STDOUT_FILENO, resp, strlen(resp));
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}
326
327
__dead void
328
usage(void)
329
{
330
	extern char *__progname;
331
332
	(void)fprintf(stderr, "usage: %s [-r | -w] [-d directory]\n",
333
	    __progname);
334
	exit(1);
335
}