1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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/param.h>
33#include <sys/mtio.h>
34#include <sys/socket.h>
35#include <sys/time.h>
36
37#include <ufs/ufs/dinode.h>
38
39#include <netinet/in.h>
40#include <netinet/in_systm.h>
41#include <netinet/ip.h>
42#include <netinet/tcp.h>
43
44#include <protocols/dumprestore.h>
45
46#include <ctype.h>
47#include <netdb.h>
48#include <pwd.h>
49#include <stdio.h>
50#include <limits.h>
51#include <errno.h>
52#include <stdlib.h>
53#include <string.h>
54#include <unistd.h>
55
56#include "pathnames.h"
57#include "dump.h"
58
59#define	TS_CLOSED	0
60#define	TS_OPEN		1
61
62static	int rmtstate = TS_CLOSED;
63static	int rmtape;
64static	char *rmtpeer;
65
66static	int okname(const char *);
67static	int rmtcall(const char *, const char *);
68static	void rmtconnaborted(int);
69static	int rmtgetb(void);
70static	void rmtgetconn(void);
71static	void rmtgets(char *, int);
72static	int rmtreply(const char *);
73
74static	int errfd = -1;
75
76int
77rmthost(const char *host)
78{
79
80	rmtpeer = strdup(host);
81	if (rmtpeer == NULL)
82		return (0);
83	signal(SIGPIPE, rmtconnaborted);
84	rmtgetconn();
85	if (rmtape < 0)
86		return (0);
87	return (1);
88}
89
90static void
91rmtconnaborted(int sig __unused)
92{
93	msg("Lost connection to remote host.\n");
94	if (errfd != -1) {
95		fd_set r;
96		struct timeval t;
97
98		FD_ZERO(&r);
99		FD_SET(errfd, &r);
100		t.tv_sec = 0;
101		t.tv_usec = 0;
102		if (select(errfd + 1, &r, NULL, NULL, &t)) {
103			int i;
104			char buf[2048];
105
106			if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
107				buf[i] = '\0';
108				msg("on %s: %s%s", rmtpeer, buf,
109					buf[i - 1] == '\n' ? "" : "\n");
110			}
111		}
112	}
113
114	exit(X_ABORT);
115}
116
117void
118rmtgetconn(void)
119{
120	char *cp;
121	const char *rmt;
122	static struct servent *sp = NULL;
123	static struct passwd *pwd = NULL;
124	char *tuser;
125	int size;
126	int throughput;
127	int on;
128
129	if (sp == NULL) {
130		sp = getservbyname("shell", "tcp");
131		if (sp == NULL) {
132			msg("shell/tcp: unknown service\n");
133			exit(X_STARTUP);
134		}
135		pwd = getpwuid(getuid());
136		if (pwd == NULL) {
137			msg("who are you?\n");
138			exit(X_STARTUP);
139		}
140	}
141	if ((cp = strchr(rmtpeer, '@')) != NULL) {
142		tuser = rmtpeer;
143		*cp = '\0';
144		if (!okname(tuser))
145			exit(X_STARTUP);
146		rmtpeer = ++cp;
147	} else
148		tuser = pwd->pw_name;
149	if ((rmt = getenv("RMT")) == NULL)
150		rmt = _PATH_RMT;
151	msg("%s", "");
152	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
153		      tuser, rmt, &errfd);
154	if (rmtape < 0) {
155		msg("login to %s as %s failed.\n", rmtpeer, tuser);
156		return;
157	}
158	(void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
159	size = ntrec * TP_BSIZE;
160	if (size > 60 * 1024)		/* XXX */
161		size = 60 * 1024;
162	/* Leave some space for rmt request/response protocol */
163	size += 2 * 1024;
164	while (size > TP_BSIZE &&
165	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
166		    size -= TP_BSIZE;
167	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
168	throughput = IPTOS_THROUGHPUT;
169	if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
170	    &throughput, sizeof(throughput)) < 0)
171		perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
172	on = 1;
173	if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
174		perror("TCP_NODELAY setsockopt");
175}
176
177static int
178okname(const char *cp0)
179{
180	const char *cp;
181	int c;
182
183	for (cp = cp0; *cp; cp++) {
184		c = *cp;
185		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
186			msg("invalid user name %s\n", cp0);
187			return (0);
188		}
189	}
190	return (1);
191}
192
193int
194rmtopen(const char *tape, int mode)
195{
196	char buf[256];
197
198	(void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode);
199	rmtstate = TS_OPEN;
200	return (rmtcall(tape, buf));
201}
202
203void
204rmtclose(void)
205{
206
207	if (rmtstate != TS_OPEN)
208		return;
209	rmtcall("close", "C\n");
210	rmtstate = TS_CLOSED;
211}
212
213int
214rmtread(char *buf, int count)
215{
216	char line[30];
217	int n, i, cc;
218
219	(void)snprintf(line, sizeof (line), "R%d\n", count);
220	n = rmtcall("read", line);
221	if (n < 0)
222		/* rmtcall() properly sets errno for us on errors. */
223		return (n);
224	for (i = 0; i < n; i += cc) {
225		cc = read(rmtape, buf+i, n - i);
226		if (cc <= 0)
227			rmtconnaborted(0);
228	}
229	return (n);
230}
231
232int
233rmtwrite(const char *buf, int count)
234{
235	char line[30];
236
237	(void)snprintf(line, sizeof (line), "W%d\n", count);
238	write(rmtape, line, strlen(line));
239	write(rmtape, buf, count);
240	return (rmtreply("write"));
241}
242
243void
244rmtwrite0(int count)
245{
246	char line[30];
247
248	(void)snprintf(line, sizeof (line), "W%d\n", count);
249	write(rmtape, line, strlen(line));
250}
251
252void
253rmtwrite1(const char *buf, int count)
254{
255
256	write(rmtape, buf, count);
257}
258
259int
260rmtwrite2(void)
261{
262
263	return (rmtreply("write"));
264}
265
266int
267rmtseek(int offset, int pos)	/* XXX off_t ? */
268{
269	char line[80];
270
271	(void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
272	return (rmtcall("seek", line));
273}
274
275struct	mtget mts;
276
277struct mtget *
278rmtstatus(void)
279{
280	int i;
281	char *cp;
282
283	if (rmtstate != TS_OPEN)
284		return (NULL);
285	rmtcall("status", "S\n");
286	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
287		*cp++ = rmtgetb();
288	return (&mts);
289}
290
291int
292rmtioctl(int cmd, int count)
293{
294	char buf[256];
295
296	if (count < 0)
297		return (-1);
298	(void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
299	return (rmtcall("ioctl", buf));
300}
301
302static int
303rmtcall(const char *cmd, const char *buf)
304{
305
306	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
307		rmtconnaborted(0);
308	return (rmtreply(cmd));
309}
310
311static int
312rmtreply(const char *cmd)
313{
314	char *cp;
315	char code[30], emsg[BUFSIZ];
316
317	rmtgets(code, sizeof (code));
318	if (*code == 'E' || *code == 'F') {
319		rmtgets(emsg, sizeof (emsg));
320		msg("%s: %s", cmd, emsg);
321		errno = atoi(code + 1);
322		if (*code == 'F')
323			rmtstate = TS_CLOSED;
324		return (-1);
325	}
326	if (*code != 'A') {
327		/* Kill trailing newline */
328		cp = code + strlen(code);
329		if (cp > code && *--cp == '\n')
330			*cp = '\0';
331
332		msg("Protocol to remote tape server botched (code \"%s\").\n",
333		    code);
334		rmtconnaborted(0);
335	}
336	return (atoi(code + 1));
337}
338
339int
340rmtgetb(void)
341{
342	char c;
343
344	if (read(rmtape, &c, 1) != 1)
345		rmtconnaborted(0);
346	return (c);
347}
348
349/* Get a line (guaranteed to have a trailing newline). */
350void
351rmtgets(char *line, int len)
352{
353	char *cp = line;
354
355	while (len > 1) {
356		*cp = rmtgetb();
357		if (*cp == '\n') {
358			cp[1] = '\0';
359			return;
360		}
361		cp++;
362		len--;
363	}
364	*cp = '\0';
365	msg("Protocol to remote tape server botched.\n");
366	msg("(rmtgets got \"%s\").\n", line);
367	rmtconnaborted(0);
368}
369