1/*	$NetBSD: dumprmt.c,v 1.36 2013/01/13 22:54:24 dholland Exp $	*/
2
3/*-
4 * Copyright (c) 1980, 1993
5 *	The Regents of the University of California.  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#include <sys/cdefs.h>
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)dumprmt.c	8.3 (Berkeley) 4/28/95";
36#else
37__RCSID("$NetBSD: dumprmt.c,v 1.36 2013/01/13 22:54:24 dholland Exp $");
38#endif
39#endif /* not lint */
40
41#include <sys/param.h>
42#include <sys/mtio.h>
43#include <sys/ioctl.h>
44#include <sys/socket.h>
45#include <sys/time.h>
46
47#include <netinet/in.h>
48#include <netinet/in_systm.h>
49#include <netinet/ip.h>
50#include <netinet/tcp.h>
51
52#include <ctype.h>
53#include <err.h>
54#include <errno.h>
55#include <netdb.h>
56#include <pwd.h>
57#include <signal.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <unistd.h>
62
63#include "pathnames.h"
64#include "dump.h"
65
66#define	TS_CLOSED	0
67#define	TS_OPEN		1
68
69static	int rmtstate = TS_CLOSED;
70static	int rmtape;
71static	char *rmtpeer;
72
73static	int	okname(const char *);
74static	int	rmtcall(const char *, const char *, int);
75__dead static	void	rmtconnaborted(int);
76static	int	rmtgetb(void);
77static	void	rmtgetconn(void);
78static	void	rmtgets(char *, int);
79	int	rmtread(char *, int);
80static	int	rmtreply(const char *, int);
81	int	rmtseek(int, int);
82
83extern	int ntrec;		/* blocking factor on tape */
84
85int
86rmthost(const char *host)
87{
88
89	if ((rmtpeer = strdup(host)) == NULL)
90		err(X_STARTUP, "strdup");
91	signal(SIGPIPE, rmtconnaborted);
92	rmtgetconn();
93	if (rmtape < 0)
94		return (0);
95	return (1);
96}
97
98static void
99rmtconnaborted(int dummy __unused)
100{
101
102	errx(X_ABORT, "Lost connection to remote host.");
103}
104
105void
106rmtgetconn(void)
107{
108	char *cp;
109	static struct servent *sp = NULL;
110	static struct passwd *pwd = NULL;
111	char *tuser, *name;
112	int size, opt;
113
114	if (sp == NULL) {
115		sp = getservbyname("shell", "tcp");
116		if (sp == NULL)
117			errx(X_STARTUP, "shell/tcp: unknown service");
118		pwd = getpwuid(getuid());
119		if (pwd == NULL)
120			errx(X_STARTUP, "who are you?");
121	}
122	if ((name = strdup(pwd->pw_name)) == NULL)
123		err(X_STARTUP, "strdup");
124	if ((cp = strchr(rmtpeer, '@')) != NULL) {
125		tuser = rmtpeer;
126		*cp = '\0';
127		if (!okname(tuser))
128			exit(X_STARTUP);
129		rmtpeer = ++cp;
130	} else
131		tuser = name;
132
133	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT,
134	    (int *)0);
135	(void)free(name);
136	if (rmtape < 0)
137		return;
138
139	size = ntrec * TP_BSIZE;
140	if (size > 60 * 1024)		/* XXX */
141		size = 60 * 1024;
142	/* Leave some space for rmt request/response protocol */
143	size += 2 * 1024;
144	while (size > TP_BSIZE &&
145	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
146		    size -= TP_BSIZE;
147	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
148
149	opt = IPTOS_THROUGHPUT;
150	(void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt));
151
152	opt = 1;
153	(void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt));
154}
155
156static int
157okname(const char *cp0)
158{
159	const char *cp;
160	unsigned char c;
161
162	for (cp = cp0; *cp; cp++) {
163		c = *cp;
164		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
165			warnx("invalid user name: %s", cp0);
166			return (0);
167		}
168	}
169	return (1);
170}
171
172int
173rmtopen(const char *tapedevice, int mode, int verbose)
174{
175	char buf[256];
176
177	(void)snprintf(buf, sizeof buf, "O%s\n%d\n", tapedevice, mode);
178	rmtstate = TS_OPEN;
179	return (rmtcall(tapedevice, buf, verbose));
180}
181
182void
183rmtclose(void)
184{
185
186	if (rmtstate != TS_OPEN)
187		return;
188	rmtcall("close", "C\n", 1);
189	rmtstate = TS_CLOSED;
190}
191
192int
193rmtread(char *buf, int count)
194{
195	char line[30];
196	int n, i, cc;
197
198	(void)snprintf(line, sizeof line, "R%d\n", count);
199	n = rmtcall("read", line, 1);
200	if (n < 0) {
201		/* rmtcall() properly sets errno for us on errors. */
202		return (n);
203	}
204	for (i = 0; i < n; i += cc) {
205		cc = read(rmtape, buf+i, n - i);
206		if (cc <= 0) {
207			rmtconnaborted(0);
208		}
209	}
210	return (n);
211}
212
213int
214rmtwrite(const char *buf, int count)
215{
216	char line[30];
217
218	(void)snprintf(line, sizeof line, "W%d\n", count);
219	write(rmtape, line, strlen(line));
220	write(rmtape, buf, count);
221	return (rmtreply("write", 1));
222}
223
224#if 0		/* XXX unused? */
225void
226rmtwrite0(int count)
227{
228	char line[30];
229
230	(void)snprintf(line, sizeof line, "W%d\n", count);
231	write(rmtape, line, strlen(line));
232}
233
234void
235rmtwrite1(char *buf, int count)
236{
237
238	write(rmtape, buf, count);
239}
240
241int
242rmtwrite2(void)
243{
244
245	return (rmtreply("write", 1));
246}
247#endif
248
249int
250rmtseek(int offset, int pos)
251{
252	char line[80];
253
254	(void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos);
255	return (rmtcall("seek", line, 1));
256}
257
258
259#if 0		/* XXX unused? */
260struct mtget *
261rmtstatus(void)
262{
263	struct	mtget mts;
264	int i;
265	char *cp;
266
267	if (rmtstate != TS_OPEN)
268		return (NULL);
269	rmtcall("status", "S\n", 1);
270	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
271		*cp++ = rmtgetb();
272	return (&mts);
273}
274#endif
275
276int
277rmtioctl(int cmd, int count)
278{
279	char buf[256];
280
281	if (count < 0)
282		return (-1);
283	(void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count);
284	return (rmtcall("ioctl", buf, 1));
285}
286
287static int
288rmtcall(const char *cmd, const char *buf, int verbose)
289{
290
291	if ((size_t)write(rmtape, buf, strlen(buf)) != strlen(buf))
292		rmtconnaborted(0);
293	return (rmtreply(cmd, verbose));
294}
295
296static int
297rmtreply(const char *cmd, int verbose)
298{
299	char *cp;
300	char code[30], emsg[BUFSIZ];
301
302	rmtgets(code, sizeof (code));
303	if (*code == 'E' || *code == 'F') {
304		rmtgets(emsg, sizeof (emsg));
305		if (verbose)
306			msg("%s: %s", cmd, emsg);
307		errno = atoi(code + 1);
308		if (*code == 'F')
309			rmtstate = TS_CLOSED;
310		return (-1);
311	}
312	if (*code != 'A') {
313		/* Kill trailing newline */
314		cp = code + strlen(code);
315		if (cp > code && *--cp == '\n')
316			*cp = '\0';
317
318		msg("Protocol to remote tape server botched (code \"%s\").\n",
319		    code);
320		rmtconnaborted(0);
321	}
322	return (atoi(code + 1));
323}
324
325int
326rmtgetb(void)
327{
328	char c;
329
330	if (read(rmtape, &c, 1) != 1)
331		rmtconnaborted(0);
332	return (c);
333}
334
335/* Get a line (guaranteed to have a trailing newline). */
336void
337rmtgets(char *line, int len)
338{
339	char *cp = line;
340
341	while (len > 1) {
342		*cp = rmtgetb();
343		if (*cp == '\n') {
344			cp[1] = '\0';
345			return;
346		}
347		cp++;
348		len--;
349	}
350	*cp = '\0';
351	msg("Protocol to remote tape server botched.\n");
352	msg("(rmtgets got \"%s\").\n", line);
353	rmtconnaborted(0);
354}
355