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 #ifndef lint
33 #if 0
34 static char sccsid[] = "@(#)dumprmt.c 8.3 (Berkeley) 4/28/95";
35 #endif
36 static const char rcsid[] =
37 "$FreeBSD$";
38 #endif /* not lint */
39
40 #include <sys/param.h>
41 #include <sys/mtio.h>
42 #include <sys/socket.h>
43 #include <sys/time.h>
44
45 #include <ufs/ufs/dinode.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 <protocols/dumprestore.h>
53
54 #include <ctype.h>
55 #include <netdb.h>
56 #include <pwd.h>
57 #include <stdio.h>
58 #include <limits.h>
59 #include <errno.h>
60 #include <stdlib.h>
61 #include <string.h>
62 #include <unistd.h>
63
64 #include "pathnames.h"
65 #include "dump.h"
66
67 #define TS_CLOSED 0
68 #define TS_OPEN 1
69
70 static int rmtstate = TS_CLOSED;
71 static int rmtape;
72 static char *rmtpeer;
73
74 static int okname(const char *);
75 static int rmtcall(const char *, const char *);
76 static void rmtconnaborted(int);
77 static int rmtgetb(void);
78 static void rmtgetconn(void);
79 static void rmtgets(char *, int);
80 static int rmtreply(const char *);
81
82 static int errfd = -1;
83 extern int ntrec; /* blocking factor on tape */
84
85 int
rmthost(const char * host)86 rmthost(const char *host)
87 {
88
89 rmtpeer = strdup(host);
90 if (rmtpeer == NULL)
91 return (0);
92 signal(SIGPIPE, rmtconnaborted);
93 rmtgetconn();
94 if (rmtape < 0)
95 return (0);
96 return (1);
97 }
98
99 static void
rmtconnaborted(int sig __unused)100 rmtconnaborted(int sig __unused)
101 {
102 msg("Lost connection to remote host.\n");
103 if (errfd != -1) {
104 fd_set r;
105 struct timeval t;
106
107 FD_ZERO(&r);
108 FD_SET(errfd, &r);
109 t.tv_sec = 0;
110 t.tv_usec = 0;
111 if (select(errfd + 1, &r, NULL, NULL, &t)) {
112 int i;
113 char buf[2048];
114
115 if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
116 buf[i] = '\0';
117 msg("on %s: %s%s", rmtpeer, buf,
118 buf[i - 1] == '\n' ? "" : "\n");
119 }
120 }
121 }
122
123 exit(X_ABORT);
124 }
125
126 void
rmtgetconn(void)127 rmtgetconn(void)
128 {
129 char *cp;
130 const char *rmt;
131 static struct servent *sp = NULL;
132 static struct passwd *pwd = NULL;
133 char *tuser;
134 int size;
135 int throughput;
136 int on;
137
138 if (sp == NULL) {
139 sp = getservbyname("shell", "tcp");
140 if (sp == NULL) {
141 msg("shell/tcp: unknown service\n");
142 exit(X_STARTUP);
143 }
144 pwd = getpwuid(getuid());
145 if (pwd == NULL) {
146 msg("who are you?\n");
147 exit(X_STARTUP);
148 }
149 }
150 if ((cp = strchr(rmtpeer, '@')) != NULL) {
151 tuser = rmtpeer;
152 *cp = '\0';
153 if (!okname(tuser))
154 exit(X_STARTUP);
155 rmtpeer = ++cp;
156 } else
157 tuser = pwd->pw_name;
158 if ((rmt = getenv("RMT")) == NULL)
159 rmt = _PATH_RMT;
160 msg("%s", "");
161 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
162 tuser, rmt, &errfd);
163 if (rmtape < 0) {
164 msg("login to %s as %s failed.\n", rmtpeer, tuser);
165 return;
166 }
167 (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
168 size = ntrec * TP_BSIZE;
169 if (size > 60 * 1024) /* XXX */
170 size = 60 * 1024;
171 /* Leave some space for rmt request/response protocol */
172 size += 2 * 1024;
173 while (size > TP_BSIZE &&
174 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
175 size -= TP_BSIZE;
176 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
177 throughput = IPTOS_THROUGHPUT;
178 if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
179 &throughput, sizeof(throughput)) < 0)
180 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
181 on = 1;
182 if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
183 perror("TCP_NODELAY setsockopt");
184 }
185
186 static int
okname(const char * cp0)187 okname(const char *cp0)
188 {
189 const char *cp;
190 int c;
191
192 for (cp = cp0; *cp; cp++) {
193 c = *cp;
194 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
195 msg("invalid user name %s\n", cp0);
196 return (0);
197 }
198 }
199 return (1);
200 }
201
202 int
rmtopen(const char * tape,int mode)203 rmtopen(const char *tape, int mode)
204 {
205 char buf[256];
206
207 (void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode);
208 rmtstate = TS_OPEN;
209 return (rmtcall(tape, buf));
210 }
211
212 void
rmtclose(void)213 rmtclose(void)
214 {
215
216 if (rmtstate != TS_OPEN)
217 return;
218 rmtcall("close", "C\n");
219 rmtstate = TS_CLOSED;
220 }
221
222 int
rmtread(char * buf,int count)223 rmtread(char *buf, int count)
224 {
225 char line[30];
226 int n, i, cc;
227
228 (void)snprintf(line, sizeof (line), "R%d\n", count);
229 n = rmtcall("read", line);
230 if (n < 0)
231 /* rmtcall() properly sets errno for us on errors. */
232 return (n);
233 for (i = 0; i < n; i += cc) {
234 cc = read(rmtape, buf+i, n - i);
235 if (cc <= 0)
236 rmtconnaborted(0);
237 }
238 return (n);
239 }
240
241 int
rmtwrite(const char * buf,int count)242 rmtwrite(const char *buf, int count)
243 {
244 char line[30];
245
246 (void)snprintf(line, sizeof (line), "W%d\n", count);
247 write(rmtape, line, strlen(line));
248 write(rmtape, buf, count);
249 return (rmtreply("write"));
250 }
251
252 void
rmtwrite0(int count)253 rmtwrite0(int count)
254 {
255 char line[30];
256
257 (void)snprintf(line, sizeof (line), "W%d\n", count);
258 write(rmtape, line, strlen(line));
259 }
260
261 void
rmtwrite1(const char * buf,int count)262 rmtwrite1(const char *buf, int count)
263 {
264
265 write(rmtape, buf, count);
266 }
267
268 int
rmtwrite2(void)269 rmtwrite2(void)
270 {
271
272 return (rmtreply("write"));
273 }
274
275 int
rmtseek(int offset,int pos)276 rmtseek(int offset, int pos) /* XXX off_t ? */
277 {
278 char line[80];
279
280 (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
281 return (rmtcall("seek", line));
282 }
283
284 struct mtget mts;
285
286 struct mtget *
rmtstatus(void)287 rmtstatus(void)
288 {
289 int i;
290 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
300 int
rmtioctl(int cmd,int count)301 rmtioctl(int cmd, int count)
302 {
303 char buf[256];
304
305 if (count < 0)
306 return (-1);
307 (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
308 return (rmtcall("ioctl", buf));
309 }
310
311 static int
rmtcall(const char * cmd,const char * buf)312 rmtcall(const char *cmd, const char *buf)
313 {
314
315 if (write(rmtape, buf, strlen(buf)) != strlen(buf))
316 rmtconnaborted(0);
317 return (rmtreply(cmd));
318 }
319
320 static int
rmtreply(const char * cmd)321 rmtreply(const char *cmd)
322 {
323 char *cp;
324 char code[30], emsg[BUFSIZ];
325
326 rmtgets(code, sizeof (code));
327 if (*code == 'E' || *code == 'F') {
328 rmtgets(emsg, sizeof (emsg));
329 msg("%s: %s", cmd, emsg);
330 errno = atoi(code + 1);
331 if (*code == 'F')
332 rmtstate = TS_CLOSED;
333 return (-1);
334 }
335 if (*code != 'A') {
336 /* Kill trailing newline */
337 cp = code + strlen(code);
338 if (cp > code && *--cp == '\n')
339 *cp = '\0';
340
341 msg("Protocol to remote tape server botched (code \"%s\").\n",
342 code);
343 rmtconnaborted(0);
344 }
345 return (atoi(code + 1));
346 }
347
348 int
rmtgetb(void)349 rmtgetb(void)
350 {
351 char c;
352
353 if (read(rmtape, &c, 1) != 1)
354 rmtconnaborted(0);
355 return (c);
356 }
357
358 /* Get a line (guaranteed to have a trailing newline). */
359 void
rmtgets(char * line,int len)360 rmtgets(char *line, int len)
361 {
362 char *cp = line;
363
364 while (len > 1) {
365 *cp = rmtgetb();
366 if (*cp == '\n') {
367 cp[1] = '\0';
368 return;
369 }
370 cp++;
371 len--;
372 }
373 *cp = '\0';
374 msg("Protocol to remote tape server botched.\n");
375 msg("(rmtgets got \"%s\").\n", line);
376 rmtconnaborted(0);
377 }
378