Head

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 %


/*	$OpenBSD: rmt.c,v 1.20 2016/08/14 18:34:48 guenther Exp $	*/

/*
 * Copyright (c) 1983 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.
 */

/*
 * rmt
 */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include <errno.h>
#include <string.h>
#include <limits.h>

int	tape = -1;

char	*record;
int	maxrecsize = -1;

#define	STRSIZE	64
char	device[PATH_MAX];
char	lastdevice[PATH_MAX] = "";
char	count[STRSIZE], mode[STRSIZE], pos[STRSIZE], op[STRSIZE];

char	resp[BUFSIZ];

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)

char		*checkbuf(char *, int);
void		getstring(char *, int);
void		error(int);
__dead void	usage(void);

int
main(int argc, char *argv[])
{
	off_t orval;
	int rval;
	char c;
	int n, i, cc;
	int ch, rflag = 0, wflag = 0;
	int f, acc;
	mode_t m;
	char *dir = NULL;
	char *devp;
	size_t dirlen;

	if (pledge("stdio rpath wpath cpath inet flock", NULL) == -1)
		err(1, "pledge");

	while ((ch = getopt(argc, argv, "d:rw")) != -1) {
		switch (ch) {
		case 'd':
			dir = optarg;
			if (*dir != '/')
				errx(1, "directory must be absolute");
			break;
		case 'r':
			rflag = 1;
			break;
		case 'w':
			wflag = 1;
			break;
		default:
			usage();
			/* NOTREACHED */
		}
	}
	argc -= optind;
	argv += optind;

	if (rflag && wflag)
		usage();

	if (argc > 0) {
		debug = fopen(*argv, "w");
		if (debug == 0)
			err(1, "cannot open debug file");
		setvbuf(debug, NULL, _IONBF, 0);
	}

	if (dir) {
		if (chdir(dir) != 0)
			err(1, "chdir");
		dirlen = strlen(dir);
	}

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, sizeof(device));
		getstring(mode, sizeof(mode));
		DEBUG2("rmtd: O %s %s\n", device, mode);

		devp = device;
		f = atoi(mode);
		m = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
		acc = f & O_ACCMODE;
		if (dir) {
			/* Strip away valid directory prefix. */
			if (strncmp(dir, devp, dirlen) == 0 &&
			    (devp[dirlen - 1] == '/' ||
			     devp[dirlen] == '/')) {
			     devp += dirlen;
			     while (*devp == '/')
				devp++;
			}
			/* Don't allow directory traversal. */
			if (strchr(devp, '/')) {
				errno = EACCES;
				goto ioerror;
			}
			f |= O_NOFOLLOW;
		}
		if (rflag) {
			/*
			 * Only allow readonly open and ignore file
			 * creation requests.
			 */
			if (acc != O_RDONLY) {
				errno = EPERM;
				goto ioerror;
			}
			f &= ~O_CREAT;
		} else if (wflag) {
			/*
			 * Require, and force creation of, a nonexistant file,
			 * unless we are reopening the last opened file again,
			 * in which case it is opened read-only.
			 */
			if (strcmp(devp, lastdevice) != 0) {
				/*
				 * Disallow read-only open since that would
				 * only result in an empty file.
				 */
				if (acc == O_RDONLY) {
					errno = EPERM;
					goto ioerror;
				}
				f |= O_CREAT | O_EXCL;
			} else {
				acc = O_RDONLY;
			}
			/* Create readonly file */
			m = S_IRUSR|S_IRGRP|S_IROTH;
		}
		/* Apply new access mode. */
		f = (f & ~O_ACCMODE) | acc;

		tape = open(devp, f, m);
		if (tape == -1)
			goto ioerror;
		(void)strlcpy(lastdevice, devp, sizeof(lastdevice));
		goto respond;

	case 'C':
		DEBUG("rmtd: C\n");
		getstring(device, sizeof(device));	/* discard */
		if (close(tape) == -1)
			goto ioerror;
		tape = -1;
		goto respond;

	case 'L':
		getstring(count, sizeof(count));
		getstring(pos, sizeof(pos));
		DEBUG2("rmtd: L %s %s\n", count, pos);
		orval = lseek(tape, strtoll(count, NULL, 0), atoi(pos));
		if (orval == -1)
			goto ioerror;
		goto respond;

	case 'W':
		getstring(count, sizeof(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, sizeof(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) snprintf(resp, sizeof resp, "A%d\n", rval);
		(void) write(STDOUT_FILENO, resp, strlen(resp));
		(void) write(STDOUT_FILENO, record, rval);
		goto top;

	case 'I':
		getstring(op, sizeof(op));
		getstring(count, sizeof(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) == -1)
			goto ioerror;
		  rval = mtop.mt_count;
		}
		goto respond;

	case 'S':		/* status */
		DEBUG("rmtd: S\n");
		{ struct mtget mtget;
		  if (ioctl(tape, MTIOCGET, (char *)&mtget) == -1)
			goto ioerror;
		  rval = sizeof (mtget);
		  (void) snprintf(resp, sizeof resp, "A%d\n", rval);
		  (void) write(STDOUT_FILENO, resp, strlen(resp));
		  (void) write(STDOUT_FILENO, (char *)&mtget, sizeof (mtget));
		  goto top;
		}

	default:
		DEBUG1("rmtd: garbage command %c\n", c);
		exit(3);
	}
respond:
	DEBUG1("rmtd: A %d\n", rval);
	(void) snprintf(resp, sizeof resp, "A%d\n", rval);
	(void) write(STDOUT_FILENO, resp, strlen(resp));
	goto top;
ioerror:
	error(errno);
	goto top;
}

void
getstring(char *bp, int size)
{
	char *cp = bp;
	char *ep = bp + size - 1;

	do {
		if (read(STDIN_FILENO, cp, 1) != 1)
			exit(0);
	} while (*cp != '\n' && ++cp < ep);
	*cp = '\0';
}

char *
checkbuf(char *record, int size)
{
	if (size <= maxrecsize)
		return (record);
	if (record != 0)
		free(record);
	record = malloc(size);
	if (record == 0) {
		DEBUG("rmtd: cannot allocate buffer space\n");
		exit(4);
	}
	maxrecsize = size;
	while (size > 1024 &&
	    setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) == -1)
		size -= 1024;
	return (record);
}

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));
}

__dead void
usage(void)
{
	extern char *__progname;

	(void)fprintf(stderr, "usage: %s [-r | -w] [-d directory]\n",
	    __progname);
	exit(1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: rmt.c,v 1.20 2016/08/14 18:34:48 guenther Exp $ */
2
3			/*
4			* Copyright (c) 1983 Regents of the University of California.
5			* All rights reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without
8			* modification, are permitted provided that the following conditions
9			* are met:
10			* 1. Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in the
14			* documentation and/or other materials provided with the distribution.
15			* 3. Neither the name of the University nor the names of its contributors
16			* may be used to endorse or promote products derived from this software
17			* without specific prior written permission.
18			*
19			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29			* SUCH DAMAGE.
30			*/
31
32			/*
33			* rmt
34			*/
35			#include <sys/types.h>
36			#include <sys/socket.h>
37			#include <sys/file.h>
38			#include <sys/stat.h>
39			#include <sys/ioctl.h>
40			#include <sys/mtio.h>
41			#include <unistd.h>
42			#include <stdio.h>
43			#include <stdlib.h>
44			#include <err.h>
45			#include <errno.h>
46			#include <string.h>
47			#include <limits.h>
48
49			int tape = -1;
50
51			char *record;
52			int maxrecsize = -1;
53
54			#define STRSIZE 64
55			char device[PATH_MAX];
56			char lastdevice[PATH_MAX] = "";
57			char count[STRSIZE], mode[STRSIZE], pos[STRSIZE], op[STRSIZE];
58
59			char resp[BUFSIZ];
60
61			FILE *debug;
62			#define DEBUG(f) if (debug) fprintf(debug, f)
63			#define DEBUG1(f,a) if (debug) fprintf(debug, f, a)
64			#define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
65
66			char checkbuf(char , int);
67			void getstring(char *, int);
68			void error(int);
69			__dead void usage(void);
70
71			int
72			main(int argc, char *argv[])
73			{
74			off_t orval;
75			int rval;
76			char c;
77			int n, i, cc;
78			int ch, rflag = 0, wflag = 0;
79			int f, acc;
80			mode_t m;
81			char *dir = NULL;
82			char *devp;
83			size_t dirlen;
84
85			if (pledge("stdio rpath wpath cpath inet flock", NULL) == -1)
86			err(1, "pledge");
87
88			while ((ch = getopt(argc, argv, "d:rw")) != -1) {
89			switch (ch) {
90			case 'd':
91			dir = optarg;
92			if (*dir != '/')
93			errx(1, "directory must be absolute");
94			break;
95			case 'r':
96			rflag = 1;
97			break;
98			case 'w':
99			wflag = 1;
100			break;
101			default:
102			usage();
103			/* NOTREACHED */
104			}
105			}
106			argc -= optind;
107			argv += optind;
108
109			if (rflag && wflag)
110			usage();
111
112			if (argc > 0) {
113			debug = fopen(*argv, "w");
114			if (debug == 0)
115			err(1, "cannot open debug file");
116			setvbuf(debug, NULL, _IONBF, 0);
117			}
118
119			if (dir) {
120			if (chdir(dir) != 0)
121			err(1, "chdir");
122			dirlen = strlen(dir);
123			}
124
125			top:
126			errno = 0;
127			rval = 0;
128			if (read(STDIN_FILENO, &c, 1) != 1)
129			exit(0);
130			switch (c) {
131
132			case 'O':
133			if (tape >= 0)
134			(void) close(tape);
135			getstring(device, sizeof(device));
136			getstring(mode, sizeof(mode));
137			DEBUG2("rmtd: O %s %s\n", device, mode);
138
139			devp = device;
140			f = atoi(mode);
141			m = S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH;
142			acc = f & O_ACCMODE;
143			if (dir) {
144			/* Strip away valid directory prefix. */
145			if (strncmp(dir, devp, dirlen) == 0 &&
146			(devp[dirlen - 1] == '/' \|\|
147			devp[dirlen] == '/')) {
148			devp += dirlen;
149			while (*devp == '/')
150			devp++;
151			}
152			/* Don't allow directory traversal. */
153			if (strchr(devp, '/')) {
154			errno = EACCES;
155			goto ioerror;
156			}
157			f \|= O_NOFOLLOW;
158			}
159			if (rflag) {
160			/*
161			* Only allow readonly open and ignore file
162			* creation requests.
163			*/
164			if (acc != O_RDONLY) {
165			errno = EPERM;
166			goto ioerror;
167			}
168			f &= ~O_CREAT;
169			} else if (wflag) {
170			/*
171			* Require, and force creation of, a nonexistant file,
172			* unless we are reopening the last opened file again,
173			* in which case it is opened read-only.
174			*/
175			if (strcmp(devp, lastdevice) != 0) {
176			/*
177			* Disallow read-only open since that would
178			* only result in an empty file.
179			*/
180			if (acc == O_RDONLY) {
181			errno = EPERM;
182			goto ioerror;
183			}
184			f \|= O_CREAT \| O_EXCL;
185			} else {
186			acc = O_RDONLY;
187			}
188			/* Create readonly file */
189			m = S_IRUSR\|S_IRGRP\|S_IROTH;
190			}
191			/* Apply new access mode. */
192			f = (f & ~O_ACCMODE) \| acc;
193
194			tape = open(devp, f, m);
195			if (tape == -1)
196			goto ioerror;
197			(void)strlcpy(lastdevice, devp, sizeof(lastdevice));
198			goto respond;
199
200			case 'C':
201			DEBUG("rmtd: C\n");
202			getstring(device, sizeof(device)); /* discard */
203			if (close(tape) == -1)
204			goto ioerror;
205			tape = -1;
206			goto respond;
207
208			case 'L':
209			getstring(count, sizeof(count));
210			getstring(pos, sizeof(pos));
211			DEBUG2("rmtd: L %s %s\n", count, pos);
212			orval = lseek(tape, strtoll(count, NULL, 0), atoi(pos));
213			if (orval == -1)
214			goto ioerror;
215			goto respond;
216
217			case 'W':
218			getstring(count, sizeof(count));
219			n = atoi(count);
220			DEBUG1("rmtd: W %s\n", count);
221			record = checkbuf(record, n);
222			for (i = 0; i < n; i += cc) {
223			cc = read(STDIN_FILENO, &record[i], n - i);
224			if (cc <= 0) {
225			DEBUG("rmtd: premature eof\n");
226			exit(2);
227			}
228			}
229			rval = write(tape, record, n);
230			if (rval < 0)
231			goto ioerror;
232			goto respond;
233
234			case 'R':
235			getstring(count, sizeof(count));
236			DEBUG1("rmtd: R %s\n", count);
237			n = atoi(count);
238			record = checkbuf(record, n);
239			rval = read(tape, record, n);
240			if (rval < 0)
241			goto ioerror;
242			(void) snprintf(resp, sizeof resp, "A%d\n", rval);
243			(void) write(STDOUT_FILENO, resp, strlen(resp));
244			(void) write(STDOUT_FILENO, record, rval);
245			goto top;
246
247			case 'I':
248			getstring(op, sizeof(op));
249			getstring(count, sizeof(count));
250			DEBUG2("rmtd: I %s %s\n", op, count);
251			{ struct mtop mtop;
252			mtop.mt_op = atoi(op);
253			mtop.mt_count = atoi(count);
254			if (ioctl(tape, MTIOCTOP, (char *)&mtop) == -1)
255			goto ioerror;
256			rval = mtop.mt_count;
257			}
258			goto respond;
259
260			case 'S': /* status */
261			DEBUG("rmtd: S\n");
262			{ struct mtget mtget;
263			if (ioctl(tape, MTIOCGET, (char *)&mtget) == -1)
264			goto ioerror;
265			rval = sizeof (mtget);
266			(void) snprintf(resp, sizeof resp, "A%d\n", rval);
267			(void) write(STDOUT_FILENO, resp, strlen(resp));
268			(void) write(STDOUT_FILENO, (char *)&mtget, sizeof (mtget));
269			goto top;
270			}
271
272			default:
273			DEBUG1("rmtd: garbage command %c\n", c);
274			exit(3);
275			}
276			respond:
277			DEBUG1("rmtd: A %d\n", rval);
278			(void) snprintf(resp, sizeof resp, "A%d\n", rval);
279			(void) write(STDOUT_FILENO, resp, strlen(resp));
280			goto top;
281			ioerror:
282			error(errno);
283			goto top;
284			}
285
286			void
287			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)
294			exit(0);
295			} while (*cp != '\n' && ++cp < ep);
296			*cp = '\0';
297			}
298
299			char *
300			checkbuf(char *record, int size)
301			{
302			if (size <= maxrecsize)
303			return (record);
304			if (record != 0)
305			free(record);
306			record = malloc(size);
307			if (record == 0) {
308			DEBUG("rmtd: cannot allocate buffer space\n");
309			exit(4);
310			}
311			maxrecsize = size;
312			while (size > 1024 &&
313			setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) == -1)
314			size -= 1024;
315			return (record);
316			}
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));
325			}
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			}