dumprmt.c revision 25288 
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	8.3 (Berkeley) 4/28/95";
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/in_systm.h>
53#include <netinet/ip.h>
54
55#include <protocols/dumprestore.h>
56
57#include <ctype.h>
58#include <err.h>
59#include <netdb.h>
60#include <pwd.h>
61#include <signal.h>
62#include <stdio.h>
63#ifdef __STDC__
64#include <stdlib.h>
65#include <string.h>
66#include <unistd.h>
67#endif
68
69#include "pathnames.h"
70#include "dump.h"
71
72#define	TS_CLOSED	0
73#define	TS_OPEN		1
74
75static	int rmtstate = TS_CLOSED;
76static	int rmtape;
77static	char *rmtpeer;
78
79static	int okname __P((char *));
80static	int rmtcall __P((char *, char *));
81static	void rmtconnaborted __P((/* int, int */));
82static	int rmtgetb __P((void));
83static	void rmtgetconn __P((void));
84static	void rmtgets __P((char *, int));
85static	int rmtreply __P((char *));
86#ifdef KERBEROS
87int	krcmd __P((char **, int /*u_short*/, char *, char *, int *, char *));
88#endif
89
90static	int errfd = -1;
91extern	int dokerberos;
92extern	int ntrec;		/* blocking factor on tape */
93
94int
95rmthost(host)
96	char *host;
97{
98
99	rmtpeer = malloc(strlen(host) + 1);
100	if (rmtpeer)
101		strcpy(rmtpeer, host);
102	else
103		rmtpeer = host;
104	signal(SIGPIPE, rmtconnaborted);
105	rmtgetconn();
106	if (rmtape < 0)
107		return (0);
108	return (1);
109}
110
111static void
112rmtconnaborted()
113{
114	msg("Lost connection to remote host.\n");
115	if (errfd != -1) {
116		fd_set r;
117		struct timeval t;
118
119		FD_ZERO(&r);
120		FD_SET(errfd, &r);
121		t.tv_sec = 0;
122		t.tv_usec = 0;
123		if (select(errfd + 1, &r, NULL, NULL, &t)) {
124			int i;
125			char buf[2048];
126
127			if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
128				buf[i] = '\0';
129				msg("on %s: %s%s", rmtpeer, buf,
130					buf[i - 1] == '\n' ? "" : "\n");
131			}
132		}
133	}
134
135	exit(X_ABORT);
136}
137
138void
139rmtgetconn()
140{
141	register char *cp;
142	register const char *rmt;
143	static struct servent *sp = NULL;
144	static struct passwd *pwd = NULL;
145#ifdef notdef
146	static int on = 1;
147#endif
148	char *tuser;
149	int size;
150	int throughput;
151
152	if (sp == NULL) {
153		sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
154		if (sp == NULL) {
155			msg("%s/tcp: unknown service\n",
156			    dokerberos ? "kshell" : "shell");
157			exit(X_ABORT);
158		}
159		pwd = getpwuid(getuid());
160		if (pwd == NULL) {
161			msg("who are you?\n");
162			exit(X_ABORT);
163		}
164	}
165	if ((cp = strchr(rmtpeer, '@')) != NULL) {
166		tuser = rmtpeer;
167		*cp = '\0';
168		if (!okname(tuser))
169			exit(X_ABORT);
170		rmtpeer = ++cp;
171	} else
172		tuser = pwd->pw_name;
173	if ((rmt = getenv("RMT")) == NULL)
174		rmt = _PATH_RMT;
175	msg("");
176#ifdef KERBEROS
177	if (dokerberos)
178		rmtape = krcmd(&rmtpeer, sp->s_port, tuser, rmt, &errfd,
179			       (char *)0);
180	else
181#endif
182		rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
183			      tuser, rmt, &errfd);
184	if (rmtape < 0) {
185		msg("login to %s as %s failed.\n", rmtpeer, tuser);
186		return;
187	}
188	(void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
189	size = ntrec * TP_BSIZE;
190	if (size > 60 * 1024)		/* XXX */
191		size = 60 * 1024;
192	/* Leave some space for rmt request/response protocol */
193	size += 2 * 1024;
194	while (size > TP_BSIZE &&
195	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
196		    size -= TP_BSIZE;
197	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
198	throughput = IPTOS_THROUGHPUT;
199	if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
200	    &throughput, sizeof(throughput)) < 0)
201		perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
202
203#ifdef notdef
204	if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
205		perror("TCP_NODELAY setsockopt");
206#endif
207}
208
209static int
210okname(cp0)
211	char *cp0;
212{
213	register char *cp;
214	register int c;
215
216	for (cp = cp0; *cp; cp++) {
217		c = *cp;
218		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
219			msg("invalid user name %s\n", cp0);
220			return (0);
221		}
222	}
223	return (1);
224}
225
226int
227rmtopen(tape, mode)
228	char *tape;
229	int mode;
230{
231	char buf[256];
232
233	(void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode);
234	rmtstate = TS_OPEN;
235	return (rmtcall(tape, buf));
236}
237
238void
239rmtclose()
240{
241
242	if (rmtstate != TS_OPEN)
243		return;
244	rmtcall("close", "C\n");
245	rmtstate = TS_CLOSED;
246}
247
248int
249rmtread(buf, count)
250	char *buf;
251	int count;
252{
253	char line[30];
254	int n, i, cc;
255	extern errno;
256
257	(void)snprintf(line, sizeof (line), "R%d\n", count);
258	n = rmtcall("read", line);
259	if (n < 0) {
260		errno = n;
261		return (-1);
262	}
263	for (i = 0; i < n; i += cc) {
264		cc = read(rmtape, buf+i, n - i);
265		if (cc <= 0) {
266			rmtconnaborted();
267		}
268	}
269	return (n);
270}
271
272int
273rmtwrite(buf, count)
274	char *buf;
275	int count;
276{
277	char line[30];
278
279	(void)snprintf(line, sizeof (line), "W%d\n", count);
280	write(rmtape, line, strlen(line));
281	write(rmtape, buf, count);
282	return (rmtreply("write"));
283}
284
285void
286rmtwrite0(count)
287	int count;
288{
289	char line[30];
290
291	(void)snprintf(line, sizeof (line), "W%d\n", count);
292	write(rmtape, line, strlen(line));
293}
294
295void
296rmtwrite1(buf, count)
297	char *buf;
298	int count;
299{
300
301	write(rmtape, buf, count);
302}
303
304int
305rmtwrite2()
306{
307
308	return (rmtreply("write"));
309}
310
311int
312rmtseek(offset, pos)
313	int offset, pos;
314{
315	char line[80];
316
317	(void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
318	return (rmtcall("seek", line));
319}
320
321struct	mtget mts;
322
323struct mtget *
324rmtstatus()
325{
326	register int i;
327	register char *cp;
328
329	if (rmtstate != TS_OPEN)
330		return (NULL);
331	rmtcall("status", "S\n");
332	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
333		*cp++ = rmtgetb();
334	return (&mts);
335}
336
337int
338rmtioctl(cmd, count)
339	int cmd, count;
340{
341	char buf[256];
342
343	if (count < 0)
344		return (-1);
345	(void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
346	return (rmtcall("ioctl", buf));
347}
348
349static int
350rmtcall(cmd, buf)
351	char *cmd, *buf;
352{
353
354	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
355		rmtconnaborted();
356	return (rmtreply(cmd));
357}
358
359static int
360rmtreply(cmd)
361	char *cmd;
362{
363	register char *cp;
364	char code[30], emsg[BUFSIZ];
365
366	rmtgets(code, sizeof (code));
367	if (*code == 'E' || *code == 'F') {
368		rmtgets(emsg, sizeof (emsg));
369		msg("%s: %s", cmd, emsg);
370		if (*code == 'F') {
371			rmtstate = TS_CLOSED;
372			return (-1);
373		}
374		return (-1);
375	}
376	if (*code != 'A') {
377		/* Kill trailing newline */
378		cp = code + strlen(code);
379		if (cp > code && *--cp == '\n')
380			*cp = '\0';
381
382		msg("Protocol to remote tape server botched (code \"%s\").\n",
383		    code);
384		rmtconnaborted();
385	}
386	return (atoi(code + 1));
387}
388
389int
390rmtgetb()
391{
392	char c;
393
394	if (read(rmtape, &c, 1) != 1)
395		rmtconnaborted();
396	return (c);
397}
398
399/* Get a line (guaranteed to have a trailing newline). */
400void
401rmtgets(line, len)
402	char *line;
403	int len;
404{
405	register char *cp = line;
406
407	while (len > 1) {
408		*cp = rmtgetb();
409		if (*cp == '\n') {
410			cp[1] = '\0';
411			return;
412		}
413		cp++;
414		len--;
415	}
416	*cp = '\0';
417	msg("Protocol to remote tape server botched.\n");
418	msg("(rmtgets got \"%s\").\n", line);
419	rmtconnaborted();
420}
421