dumprmt.c revision 12377 
1/*-
2 * Copyright (c) 1980, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char sccsid[] = "@(#)dumprmt.c	8.1 (Berkeley) 6/5/93";
36#endif /* not lint */
37
38#include <sys/param.h>
39#include <sys/mtio.h>
40#include <sys/ioctl.h>
41#include <sys/socket.h>
42#include <sys/time.h>
43#ifdef sunos
44#include <sys/vnode.h>
45
46#include <ufs/inode.h>
47#else
48#include <ufs/ufs/dinode.h>
49#endif
50
51#include <netinet/in.h>
52#include <netinet/tcp.h>
53
54#include <protocols/dumprestore.h>
55
56#include <ctype.h>
57#include <netdb.h>
58#include <pwd.h>
59#include <signal.h>
60#include <stdio.h>
61#ifdef __STDC__
62#include <stdlib.h>
63#include <string.h>
64#include <unistd.h>
65#endif
66
67#include "pathnames.h"
68#include "dump.h"
69
70#define	TS_CLOSED	0
71#define	TS_OPEN		1
72
73static	int rmtstate = TS_CLOSED;
74static	int rmtape;
75static	char *rmtpeer;
76
77static	int okname __P((char *));
78static	int rmtcall __P((char *, char *));
79static	void rmtconnaborted __P((/* int, int */));
80static	int rmtgetb __P((void));
81static	void rmtgetconn __P((void));
82static	void rmtgets __P((char *, int));
83static	int rmtreply __P((char *));
84
85extern	int ntrec;		/* blocking factor on tape */
86
87int
88rmthost(host)
89	char *host;
90{
91
92	rmtpeer = malloc(strlen(host) + 1);
93	if (rmtpeer)
94		strcpy(rmtpeer, host);
95	else
96		rmtpeer = host;
97	signal(SIGPIPE, rmtconnaborted);
98	rmtgetconn();
99	if (rmtape < 0)
100		return (0);
101	return (1);
102}
103
104static void
105rmtconnaborted()
106{
107
108	(void) fprintf(stderr, "rdump: Lost connection to remote host.\n");
109	exit(1);
110}
111
112void
113rmtgetconn()
114{
115	register char *cp;
116	register const char *rmt;
117	static struct servent *sp = NULL;
118	static struct passwd *pwd = NULL;
119#ifdef notdef
120	static int on = 1;
121#endif
122	char *tuser;
123	int size;
124	int maxseg;
125
126	if (sp == NULL) {
127		sp = getservbyname("shell", "tcp");
128		if (sp == NULL) {
129			(void) fprintf(stderr,
130			    "rdump: shell/tcp: unknown service\n");
131			exit(1);
132		}
133		pwd = getpwuid(getuid());
134		if (pwd == NULL) {
135			(void) fprintf(stderr, "rdump: who are you?\n");
136			exit(1);
137		}
138	}
139	if ((cp = index(rmtpeer, '@')) != NULL) {
140		tuser = rmtpeer;
141		*cp = '\0';
142		if (!okname(tuser))
143			exit(1);
144		rmtpeer = ++cp;
145	} else
146		tuser = pwd->pw_name;
147	if ((rmt = getenv("RMT")) == NULL)
148		rmt = _PATH_RMT;
149	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, tuser,
150	    rmt, (int *)0);
151	size = ntrec * TP_BSIZE;
152	if (size > 60 * 1024)		/* XXX */
153		size = 60 * 1024;
154	/* Leave some space for rmt request/response protocol */
155	size += 2 * 1024;
156	while (size > TP_BSIZE &&
157	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
158		    size -= TP_BSIZE;
159	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
160	maxseg = 1024;
161	if (setsockopt(rmtape, IPPROTO_TCP, TCP_MAXSEG,
162	    &maxseg, sizeof (maxseg)) < 0)
163		perror("TCP_MAXSEG setsockopt");
164
165#ifdef notdef
166	if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
167		perror("TCP_NODELAY setsockopt");
168#endif
169}
170
171static int
172okname(cp0)
173	char *cp0;
174{
175	register char *cp;
176	register int c;
177
178	for (cp = cp0; *cp; cp++) {
179		c = *cp;
180		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
181			(void) fprintf(stderr, "rdump: invalid user name %s\n",
182			    cp0);
183			return (0);
184		}
185	}
186	return (1);
187}
188
189int
190rmtopen(tape, mode)
191	char *tape;
192	int mode;
193{
194	char buf[256];
195
196	(void)sprintf(buf, "O%s\n%d\n", tape, mode);
197	rmtstate = TS_OPEN;
198	return (rmtcall(tape, buf));
199}
200
201void
202rmtclose()
203{
204
205	if (rmtstate != TS_OPEN)
206		return;
207	rmtcall("close", "C\n");
208	rmtstate = TS_CLOSED;
209}
210
211int
212rmtread(buf, count)
213	char *buf;
214	int count;
215{
216	char line[30];
217	int n, i, cc;
218	extern errno;
219
220	(void)sprintf(line, "R%d\n", count);
221	n = rmtcall("read", line);
222	if (n < 0) {
223		errno = n;
224		return (-1);
225	}
226	for (i = 0; i < n; i += cc) {
227		cc = read(rmtape, buf+i, n - i);
228		if (cc <= 0) {
229			rmtconnaborted();
230		}
231	}
232	return (n);
233}
234
235int
236rmtwrite(buf, count)
237	char *buf;
238	int count;
239{
240	char line[30];
241
242	(void)sprintf(line, "W%d\n", count);
243	write(rmtape, line, strlen(line));
244	write(rmtape, buf, count);
245	return (rmtreply("write"));
246}
247
248void
249rmtwrite0(count)
250	int count;
251{
252	char line[30];
253
254	(void)sprintf(line, "W%d\n", count);
255	write(rmtape, line, strlen(line));
256}
257
258void
259rmtwrite1(buf, count)
260	char *buf;
261	int count;
262{
263
264	write(rmtape, buf, count);
265}
266
267int
268rmtwrite2()
269{
270
271	return (rmtreply("write"));
272}
273
274int
275rmtseek(offset, pos)
276	int offset, pos;
277{
278	char line[80];
279
280	(void)sprintf(line, "L%d\n%d\n", offset, pos);
281	return (rmtcall("seek", line));
282}
283
284struct	mtget mts;
285
286struct mtget *
287rmtstatus()
288{
289	register int i;
290	register char *cp;
291
292	if (rmtstate != TS_OPEN)
293		return (NULL);
294	rmtcall("status", "S\n");
295	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
296		*cp++ = rmtgetb();
297	return (&mts);
298}
299
300int
301rmtioctl(cmd, count)
302	int cmd, count;
303{
304	char buf[256];
305
306	if (count < 0)
307		return (-1);
308	(void)sprintf(buf, "I%d\n%d\n", cmd, count);
309	return (rmtcall("ioctl", buf));
310}
311
312static int
313rmtcall(cmd, buf)
314	char *cmd, *buf;
315{
316
317	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
318		rmtconnaborted();
319	return (rmtreply(cmd));
320}
321
322static int
323rmtreply(cmd)
324	char *cmd;
325{
326	register char *cp;
327	char code[30], emsg[BUFSIZ];
328
329	rmtgets(code, sizeof (code));
330	if (*code == 'E' || *code == 'F') {
331		rmtgets(emsg, sizeof (emsg));
332		msg("%s: %s", cmd, emsg);
333		if (*code == 'F') {
334			rmtstate = TS_CLOSED;
335			return (-1);
336		}
337		return (-1);
338	}
339	if (*code != 'A') {
340		/* Kill trailing newline */
341		cp = code + strlen(code);
342		if (cp > code && *--cp == '\n')
343			*cp = '\0';
344
345		msg("Protocol to remote tape server botched (code \"%s\").\n",
346		    code);
347		rmtconnaborted();
348	}
349	return (atoi(code + 1));
350}
351
352int
353rmtgetb()
354{
355	char c;
356
357	if (read(rmtape, &c, 1) != 1)
358		rmtconnaborted();
359	return (c);
360}
361
362/* Get a line (guaranteed to have a trailing newline). */
363void
364rmtgets(line, len)
365	char *line;
366	int len;
367{
368	register char *cp = line;
369
370	while (len > 1) {
371		*cp = rmtgetb();
372		if (*cp == '\n') {
373			cp[1] = '\0';
374			return;
375		}
376		cp++;
377		len--;
378	}
379	*cp = '\0';
380	msg("Protocol to remote tape server botched.\n");
381	msg("(rmtgets got \"%s\").\n", line);
382	rmtconnaborted();
383}
384