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