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 * 3. 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 * @(#)dumprmt.c 8.3 (Berkeley) 4/28/95
30 * $FreeBSD: src/sbin/dump/dumprmt.c,v 1.14.2.1 2000/07/01 06:31:52 ps Exp $
31 */
32
33 #include <sys/param.h>
34 #include <sys/mtio.h>
35 #include <sys/socket.h>
36 #include <sys/time.h>
37 #include <vfs/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 <err.h>
48 #include <netdb.h>
49 #include <pwd.h>
50 #include <stdio.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
62 static int rmtstate = TS_CLOSED;
63 static int rmtape;
64 static char *rmtpeer;
65
66 static int okname(char *);
67 static int rmtcall(const char *, const char *);
68 static void rmtconnaborted(int);
69 static int rmtgetb(void);
70 static void rmtgetconn(void);
71 static void rmtgets(char *, int);
72 static int rmtreply(const char *);
73 #ifdef KERBEROS
74 int krcmd(char **, int /*u_short*/, char *, char *, int *, char *);
75 #endif
76
77 static int errfd = -1;
78
79 int
rmthost(const char * hostname)80 rmthost(const char *hostname)
81 {
82
83 if ((rmtpeer = strdup(hostname)) == NULL)
84 err(1, "strdup failed");
85 signal(SIGPIPE, rmtconnaborted);
86 rmtgetconn();
87 if (rmtape < 0)
88 return (0);
89 return (1);
90 }
91
92 static void
rmtconnaborted(int signo __unused)93 rmtconnaborted(int signo __unused)
94 {
95 msg("Lost connection to remote host.\n");
96 if (errfd != -1) {
97 fd_set r;
98 struct timeval t;
99
100 FD_ZERO(&r);
101 FD_SET(errfd, &r);
102 t.tv_sec = 0;
103 t.tv_usec = 0;
104 if (select(errfd + 1, &r, NULL, NULL, &t)) {
105 int i;
106 char buf[2048];
107
108 if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
109 buf[i] = '\0';
110 msg("on %s: %s%s", rmtpeer, buf,
111 buf[i - 1] == '\n' ? "" : "\n");
112 }
113 }
114 }
115
116 exit(X_ABORT);
117 }
118
119 void
rmtgetconn(void)120 rmtgetconn(void)
121 {
122 char *cp;
123 const char *rmt;
124 static struct servent *sp = NULL;
125 static struct passwd *pwd = NULL;
126 char *tuser;
127 int size;
128 int throughput;
129 int on;
130
131 if (sp == NULL) {
132 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
133 if (sp == NULL) {
134 msg("%s/tcp: unknown service\n",
135 dokerberos ? "kshell" : "shell");
136 exit(X_STARTUP);
137 }
138 pwd = getpwuid(getuid());
139 if (pwd == NULL) {
140 msg("who are you?\n");
141 exit(X_STARTUP);
142 }
143 }
144 if ((cp = strchr(rmtpeer, '@')) != NULL) {
145 tuser = rmtpeer;
146 *cp = '\0';
147 if (!okname(tuser))
148 exit(X_STARTUP);
149 rmtpeer = ++cp;
150 } else
151 tuser = pwd->pw_name;
152 if ((rmt = getenv("RMT")) == NULL)
153 rmt = _PATH_RMT;
154 msg("%s", "");
155 #ifdef KERBEROS
156 if (dokerberos)
157 rmtape = krcmd(&rmtpeer, sp->s_port, tuser, rmt, &errfd, NULL);
158 else
159 #endif
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 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 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(char * cp0)186 okname(char *cp0)
187 {
188 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 * rtape,int mode)202 rmtopen(const char *rtape, int mode)
203 {
204 char buf[256];
205
206 snprintf(buf, sizeof (buf), "O%.226s\n%d\n", rtape, mode);
207 rmtstate = TS_OPEN;
208 return (rmtcall(rtape, 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 #ifdef RRESTORE
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 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
rmtseek(int offset,int pos)242 rmtseek(int offset, int pos)
243 {
244 char line[80];
245
246 snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
247 return (rmtcall("seek", line));
248 }
249
250 int
rmtioctl(int cmd,int count)251 rmtioctl(int cmd, int count)
252 {
253 char buf[256];
254
255 if (count < 0)
256 return (-1);
257 snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
258 return (rmtcall("ioctl", buf));
259 }
260 #endif /* RRESTORE */
261
262 int
rmtwrite(const void * buf,int count)263 rmtwrite(const void *buf, int count)
264 {
265 char line[30];
266
267 snprintf(line, sizeof (line), "W%d\n", count);
268 write(rmtape, line, strlen(line));
269 write(rmtape, buf, count);
270 return (rmtreply("write"));
271 }
272
273 static int
rmtcall(const char * cmd,const char * buf)274 rmtcall(const char *cmd, const char *buf)
275 {
276 ssize_t len = (ssize_t)strlen(buf);
277
278 if (write(rmtape, buf, len) != len)
279 rmtconnaborted(0);
280 return (rmtreply(cmd));
281 }
282
283 static int
rmtreply(const char * cmd)284 rmtreply(const char *cmd)
285 {
286 char *cp;
287 char code[30], emsg[BUFSIZ];
288
289 rmtgets(code, sizeof (code));
290 if (*code == 'E' || *code == 'F') {
291 rmtgets(emsg, sizeof (emsg));
292 msg("%s: %s", cmd, emsg);
293 errno = atoi(code + 1);
294 if (*code == 'F')
295 rmtstate = TS_CLOSED;
296 return (-1);
297 }
298 if (*code != 'A') {
299 /* Kill trailing newline */
300 cp = code + strlen(code);
301 if (cp > code && *--cp == '\n')
302 *cp = '\0';
303
304 msg("Protocol to remote tape server botched (code \"%s\").\n",
305 code);
306 rmtconnaborted(0);
307 }
308 return (atoi(code + 1));
309 }
310
311 int
rmtgetb(void)312 rmtgetb(void)
313 {
314 char c;
315
316 if (read(rmtape, &c, 1) != 1)
317 rmtconnaborted(0);
318 return (c);
319 }
320
321 /* Get a line (guaranteed to have a trailing newline). */
322 void
rmtgets(char * line,int len)323 rmtgets(char *line, int len)
324 {
325 char *cp = line;
326
327 while (len > 1) {
328 *cp = rmtgetb();
329 if (*cp == '\n') {
330 cp[1] = '\0';
331 return;
332 }
333 cp++;
334 len--;
335 }
336 *cp = '\0';
337 msg("Protocol to remote tape server botched.\n");
338 msg("(rmtgets got \"%s\").\n", line);
339 rmtconnaborted(0);
340 }
341