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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31#if 0
32static char sccsid[] = "@(#)dumprmt.c	8.3 (Berkeley) 4/28/95";
33#endif
34static const char rcsid[] =
35  "$FreeBSD$";
36#endif /* not lint */
37
38#include <sys/param.h>
39#include <sys/mtio.h>
40#include <sys/socket.h>
41#include <sys/time.h>
42
43#include <ufs/ufs/dinode.h>
44
45#include <netinet/in.h>
46#include <netinet/in_systm.h>
47#include <netinet/ip.h>
48#include <netinet/tcp.h>
49
50#include <protocols/dumprestore.h>
51
52#include <ctype.h>
53#include <netdb.h>
54#include <pwd.h>
55#include <stdio.h>
56#include <limits.h>
57#include <errno.h>
58#include <stdlib.h>
59#include <string.h>
60#include <unistd.h>
61
62#include "pathnames.h"
63#include "dump.h"
64
65#define	TS_CLOSED	0
66#define	TS_OPEN		1
67
68static	int rmtstate = TS_CLOSED;
69static	int rmtape;
70static	char *rmtpeer;
71
72static	int okname(const char *);
73static	int rmtcall(const char *, const char *);
74static	void rmtconnaborted(int);
75static	int rmtgetb(void);
76static	void rmtgetconn(void);
77static	void rmtgets(char *, int);
78static	int rmtreply(const char *);
79
80static	int errfd = -1;
81extern	int ntrec;		/* blocking factor on tape */
82
83int
84rmthost(const char *host)
85{
86
87	rmtpeer = strdup(host);
88	if (rmtpeer == NULL)
89		return (0);
90	signal(SIGPIPE, rmtconnaborted);
91	rmtgetconn();
92	if (rmtape < 0)
93		return (0);
94	return (1);
95}
96
97static void
98rmtconnaborted(int sig __unused)
99{
100	msg("Lost connection to remote host.\n");
101	if (errfd != -1) {
102		fd_set r;
103		struct timeval t;
104
105		FD_ZERO(&r);
106		FD_SET(errfd, &r);
107		t.tv_sec = 0;
108		t.tv_usec = 0;
109		if (select(errfd + 1, &r, NULL, NULL, &t)) {
110			int i;
111			char buf[2048];
112
113			if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
114				buf[i] = '\0';
115				msg("on %s: %s%s", rmtpeer, buf,
116					buf[i - 1] == '\n' ? "" : "\n");
117			}
118		}
119	}
120
121	exit(X_ABORT);
122}
123
124void
125rmtgetconn(void)
126{
127	char *cp;
128	const char *rmt;
129	static struct servent *sp = NULL;
130	static struct passwd *pwd = NULL;
131	char *tuser;
132	int size;
133	int throughput;
134	int on;
135
136	if (sp == NULL) {
137		sp = getservbyname("shell", "tcp");
138		if (sp == NULL) {
139			msg("shell/tcp: unknown service\n");
140			exit(X_STARTUP);
141		}
142		pwd = getpwuid(getuid());
143		if (pwd == NULL) {
144			msg("who are you?\n");
145			exit(X_STARTUP);
146		}
147	}
148	if ((cp = strchr(rmtpeer, '@')) != NULL) {
149		tuser = rmtpeer;
150		*cp = '\0';
151		if (!okname(tuser))
152			exit(X_STARTUP);
153		rmtpeer = ++cp;
154	} else
155		tuser = pwd->pw_name;
156	if ((rmt = getenv("RMT")) == NULL)
157		rmt = _PATH_RMT;
158	msg("%s", "");
159	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
160		      tuser, rmt, &errfd);
161	if (rmtape < 0) {
162		msg("login to %s as %s failed.\n", rmtpeer, tuser);
163		return;
164	}
165	(void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
166	size = ntrec * TP_BSIZE;
167	if (size > 60 * 1024)		/* XXX */
168		size = 60 * 1024;
169	/* Leave some space for rmt request/response protocol */
170	size += 2 * 1024;
171	while (size > TP_BSIZE &&
172	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
173		    size -= TP_BSIZE;
174	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
175	throughput = IPTOS_THROUGHPUT;
176	if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
177	    &throughput, sizeof(throughput)) < 0)
178		perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
179	on = 1;
180	if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
181		perror("TCP_NODELAY setsockopt");
182}
183
184static int
185okname(const char *cp0)
186{
187	const char *cp;
188	int c;
189
190	for (cp = cp0; *cp; cp++) {
191		c = *cp;
192		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
193			msg("invalid user name %s\n", cp0);
194			return (0);
195		}
196	}
197	return (1);
198}
199
200int
201rmtopen(const char *tape, int mode)
202{
203	char buf[256];
204
205	(void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode);
206	rmtstate = TS_OPEN;
207	return (rmtcall(tape, buf));
208}
209
210void
211rmtclose(void)
212{
213
214	if (rmtstate != TS_OPEN)
215		return;
216	rmtcall("close", "C\n");
217	rmtstate = TS_CLOSED;
218}
219
220int
221rmtread(char *buf, int count)
222{
223	char line[30];
224	int n, i, cc;
225
226	(void)snprintf(line, sizeof (line), "R%d\n", count);
227	n = rmtcall("read", line);
228	if (n < 0)
229		/* rmtcall() properly sets errno for us on errors. */
230		return (n);
231	for (i = 0; i < n; i += cc) {
232		cc = read(rmtape, buf+i, n - i);
233		if (cc <= 0)
234			rmtconnaborted(0);
235	}
236	return (n);
237}
238
239int
240rmtwrite(const char *buf, int count)
241{
242	char line[30];
243
244	(void)snprintf(line, sizeof (line), "W%d\n", count);
245	write(rmtape, line, strlen(line));
246	write(rmtape, buf, count);
247	return (rmtreply("write"));
248}
249
250void
251rmtwrite0(int count)
252{
253	char line[30];
254
255	(void)snprintf(line, sizeof (line), "W%d\n", count);
256	write(rmtape, line, strlen(line));
257}
258
259void
260rmtwrite1(const char *buf, int count)
261{
262
263	write(rmtape, buf, count);
264}
265
266int
267rmtwrite2(void)
268{
269
270	return (rmtreply("write"));
271}
272
273int
274rmtseek(int offset, int pos)	/* XXX off_t ? */
275{
276	char line[80];
277
278	(void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
279	return (rmtcall("seek", line));
280}
281
282struct	mtget mts;
283
284struct mtget *
285rmtstatus(void)
286{
287	int i;
288	char *cp;
289
290	if (rmtstate != TS_OPEN)
291		return (NULL);
292	rmtcall("status", "S\n");
293	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
294		*cp++ = rmtgetb();
295	return (&mts);
296}
297
298int
299rmtioctl(int cmd, int count)
300{
301	char buf[256];
302
303	if (count < 0)
304		return (-1);
305	(void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
306	return (rmtcall("ioctl", buf));
307}
308
309static int
310rmtcall(const char *cmd, const char *buf)
311{
312
313	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
314		rmtconnaborted(0);
315	return (rmtreply(cmd));
316}
317
318static int
319rmtreply(const char *cmd)
320{
321	char *cp;
322	char code[30], emsg[BUFSIZ];
323
324	rmtgets(code, sizeof (code));
325	if (*code == 'E' || *code == 'F') {
326		rmtgets(emsg, sizeof (emsg));
327		msg("%s: %s", cmd, emsg);
328		errno = atoi(code + 1);
329		if (*code == 'F')
330			rmtstate = TS_CLOSED;
331		return (-1);
332	}
333	if (*code != 'A') {
334		/* Kill trailing newline */
335		cp = code + strlen(code);
336		if (cp > code && *--cp == '\n')
337			*cp = '\0';
338
339		msg("Protocol to remote tape server botched (code \"%s\").\n",
340		    code);
341		rmtconnaborted(0);
342	}
343	return (atoi(code + 1));
344}
345
346int
347rmtgetb(void)
348{
349	char c;
350
351	if (read(rmtape, &c, 1) != 1)
352		rmtconnaborted(0);
353	return (c);
354}
355
356/* Get a line (guaranteed to have a trailing newline). */
357void
358rmtgets(char *line, int len)
359{
360	char *cp = line;
361
362	while (len > 1) {
363		*cp = rmtgetb();
364		if (*cp == '\n') {
365			cp[1] = '\0';
366			return;
367		}
368		cp++;
369		len--;
370	}
371	*cp = '\0';
372	msg("Protocol to remote tape server botched.\n");
373	msg("(rmtgets got \"%s\").\n", line);
374	rmtconnaborted(0);
375}
376