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
32 static char sccsid[] = "@(#)dumprmt.c 8.3 (Berkeley) 4/28/95";
33 #endif
34 static 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
68 static int rmtstate = TS_CLOSED;
69 static int rmtape;
70 static char *rmtpeer;
71
72 static int okname(const char *);
73 static int rmtcall(const char *, const char *);
74 static void rmtconnaborted(int);
75 static int rmtgetb(void);
76 static void rmtgetconn(void);
77 static void rmtgets(char *, int);
78 static int rmtreply(const char *);
79
80 static int errfd = -1;
81 extern int ntrec; /* blocking factor on tape */
82
83 int
rmthost(const char * host)84 rmthost(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
97 static void
rmtconnaborted(int sig __unused)98 rmtconnaborted(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
124 void
rmtgetconn(void)125 rmtgetconn(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
184 static int
okname(const char * cp0)185 okname(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
200 int
rmtopen(const char * tape,int mode)201 rmtopen(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
210 void
rmtclose(void)211 rmtclose(void)
212 {
213
214 if (rmtstate != TS_OPEN)
215 return;
216 rmtcall("close", "C\n");
217 rmtstate = TS_CLOSED;
218 }
219
220 int
rmtread(char * buf,int count)221 rmtread(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
239 int
rmtwrite(const char * buf,int count)240 rmtwrite(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
250 void
rmtwrite0(int count)251 rmtwrite0(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
259 void
rmtwrite1(const char * buf,int count)260 rmtwrite1(const char *buf, int count)
261 {
262
263 write(rmtape, buf, count);
264 }
265
266 int
rmtwrite2(void)267 rmtwrite2(void)
268 {
269
270 return (rmtreply("write"));
271 }
272
273 int
rmtseek(int offset,int pos)274 rmtseek(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
282 struct mtget mts;
283
284 struct mtget *
rmtstatus(void)285 rmtstatus(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
298 int
rmtioctl(int cmd,int count)299 rmtioctl(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
309 static int
rmtcall(const char * cmd,const char * buf)310 rmtcall(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
318 static int
rmtreply(const char * cmd)319 rmtreply(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
346 int
rmtgetb(void)347 rmtgetb(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). */
357 void
rmtgets(char * line,int len)358 rmtgets(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