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dumprmt.c revision 1.1.1.3 
      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. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)dumprmt.c	8.3 (Berkeley) 4/28/95";
     36 #endif /* not lint */
     37 
     38 #include <sys/param.h>
     39 #include <sys/mtio.h>
     40 #include <sys/ioctl.h>
     41 #include <sys/socket.h>
     42 #include <sys/time.h>
     43 #ifdef sunos
     44 #include <sys/vnode.h>
     45 
     46 #include <ufs/inode.h>
     47 #else
     48 #include <ufs/ufs/dinode.h>
     49 #endif
     50 
     51 #include <netinet/in.h>
     52 #include <netinet/tcp.h>
     53 
     54 #include <protocols/dumprestore.h>
     55 
     56 #include <ctype.h>
     57 #include <err.h>
     58 #include <netdb.h>
     59 #include <pwd.h>
     60 #include <signal.h>
     61 #include <stdio.h>
     62 #ifdef __STDC__
     63 #include <stdlib.h>
     64 #include <string.h>
     65 #include <unistd.h>
     66 #endif
     67 
     68 #include "pathnames.h"
     69 #include "dump.h"
     70 
     71 #define	TS_CLOSED	0
     72 #define	TS_OPEN		1
     73 
     74 static	int rmtstate = TS_CLOSED;
     75 static	int rmtape;
     76 static	char *rmtpeer;
     77 
     78 static	int okname __P((char *));
     79 static	int rmtcall __P((char *, char *));
     80 static	void rmtconnaborted __P((/* int, int */));
     81 static	int rmtgetb __P((void));
     82 static	void rmtgetconn __P((void));
     83 static	void rmtgets __P((char *, int));
     84 static	int rmtreply __P((char *));
     85 
     86 extern	int ntrec;		/* blocking factor on tape */
     87 
     88 int
     89 rmthost(host)
     90 	char *host;
     91 {
     92 
     93 	rmtpeer = malloc(strlen(host) + 1);
     94 	if (rmtpeer)
     95 		strcpy(rmtpeer, host);
     96 	else
     97 		rmtpeer = host;
     98 	signal(SIGPIPE, rmtconnaborted);
     99 	rmtgetconn();
    100 	if (rmtape < 0)
    101 		return (0);
    102 	return (1);
    103 }
    104 
    105 static void
    106 rmtconnaborted()
    107 {
    108 
    109 	errx(1, "Lost connection to remote host.");
    110 }
    111 
    112 void
    113 rmtgetconn()
    114 {
    115 	register char *cp;
    116 	static struct servent *sp = NULL;
    117 	static struct passwd *pwd = NULL;
    118 #ifdef notdef
    119 	static int on = 1;
    120 #endif
    121 	char *tuser;
    122 	int size;
    123 	int maxseg;
    124 
    125 	if (sp == NULL) {
    126 		sp = getservbyname("shell", "tcp");
    127 		if (sp == NULL)
    128 			errx(1, "shell/tcp: unknown service");
    129 		pwd = getpwuid(getuid());
    130 		if (pwd == NULL)
    131 			errx(1, "who are you?");
    132 	}
    133 	if ((cp = strchr(rmtpeer, '@')) != NULL) {
    134 		tuser = rmtpeer;
    135 		*cp = '\0';
    136 		if (!okname(tuser))
    137 			exit(1);
    138 		rmtpeer = ++cp;
    139 	} else
    140 		tuser = pwd->pw_name;
    141 	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, tuser,
    142 	    _PATH_RMT, (int *)0);
    143 	size = ntrec * TP_BSIZE;
    144 	if (size > 60 * 1024)		/* XXX */
    145 		size = 60 * 1024;
    146 	/* Leave some space for rmt request/response protocol */
    147 	size += 2 * 1024;
    148 	while (size > TP_BSIZE &&
    149 	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
    150 		    size -= TP_BSIZE;
    151 	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
    152 	maxseg = 1024;
    153 	if (setsockopt(rmtape, IPPROTO_TCP, TCP_MAXSEG,
    154 	    &maxseg, sizeof (maxseg)) < 0)
    155 		perror("TCP_MAXSEG setsockopt");
    156 
    157 #ifdef notdef
    158 	if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
    159 		perror("TCP_NODELAY setsockopt");
    160 #endif
    161 }
    162 
    163 static int
    164 okname(cp0)
    165 	char *cp0;
    166 {
    167 	register char *cp;
    168 	register int c;
    169 
    170 	for (cp = cp0; *cp; cp++) {
    171 		c = *cp;
    172 		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
    173 			warnx("invalid user name: %s", cp0);
    174 			return (0);
    175 		}
    176 	}
    177 	return (1);
    178 }
    179 
    180 int
    181 rmtopen(tape, mode)
    182 	char *tape;
    183 	int mode;
    184 {
    185 	char buf[256];
    186 
    187 	(void)sprintf(buf, "O%s\n%d\n", tape, mode);
    188 	rmtstate = TS_OPEN;
    189 	return (rmtcall(tape, buf));
    190 }
    191 
    192 void
    193 rmtclose()
    194 {
    195 
    196 	if (rmtstate != TS_OPEN)
    197 		return;
    198 	rmtcall("close", "C\n");
    199 	rmtstate = TS_CLOSED;
    200 }
    201 
    202 int
    203 rmtread(buf, count)
    204 	char *buf;
    205 	int count;
    206 {
    207 	char line[30];
    208 	int n, i, cc;
    209 	extern errno;
    210 
    211 	(void)sprintf(line, "R%d\n", count);
    212 	n = rmtcall("read", line);
    213 	if (n < 0) {
    214 		errno = n;
    215 		return (-1);
    216 	}
    217 	for (i = 0; i < n; i += cc) {
    218 		cc = read(rmtape, buf+i, n - i);
    219 		if (cc <= 0) {
    220 			rmtconnaborted();
    221 		}
    222 	}
    223 	return (n);
    224 }
    225 
    226 int
    227 rmtwrite(buf, count)
    228 	char *buf;
    229 	int count;
    230 {
    231 	char line[30];
    232 
    233 	(void)sprintf(line, "W%d\n", count);
    234 	write(rmtape, line, strlen(line));
    235 	write(rmtape, buf, count);
    236 	return (rmtreply("write"));
    237 }
    238 
    239 void
    240 rmtwrite0(count)
    241 	int count;
    242 {
    243 	char line[30];
    244 
    245 	(void)sprintf(line, "W%d\n", count);
    246 	write(rmtape, line, strlen(line));
    247 }
    248 
    249 void
    250 rmtwrite1(buf, count)
    251 	char *buf;
    252 	int count;
    253 {
    254 
    255 	write(rmtape, buf, count);
    256 }
    257 
    258 int
    259 rmtwrite2()
    260 {
    261 
    262 	return (rmtreply("write"));
    263 }
    264 
    265 int
    266 rmtseek(offset, pos)
    267 	int offset, pos;
    268 {
    269 	char line[80];
    270 
    271 	(void)sprintf(line, "L%d\n%d\n", offset, pos);
    272 	return (rmtcall("seek", line));
    273 }
    274 
    275 struct	mtget mts;
    276 
    277 struct mtget *
    278 rmtstatus()
    279 {
    280 	register int i;
    281 	register 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 
    291 int
    292 rmtioctl(cmd, count)
    293 	int cmd, count;
    294 {
    295 	char buf[256];
    296 
    297 	if (count < 0)
    298 		return (-1);
    299 	(void)sprintf(buf, "I%d\n%d\n", cmd, count);
    300 	return (rmtcall("ioctl", buf));
    301 }
    302 
    303 static int
    304 rmtcall(cmd, buf)
    305 	char *cmd, *buf;
    306 {
    307 
    308 	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
    309 		rmtconnaborted();
    310 	return (rmtreply(cmd));
    311 }
    312 
    313 static int
    314 rmtreply(cmd)
    315 	char *cmd;
    316 {
    317 	register char *cp;
    318 	char code[30], emsg[BUFSIZ];
    319 
    320 	rmtgets(code, sizeof (code));
    321 	if (*code == 'E' || *code == 'F') {
    322 		rmtgets(emsg, sizeof (emsg));
    323 		msg("%s: %s", cmd, emsg);
    324 		if (*code == 'F') {
    325 			rmtstate = TS_CLOSED;
    326 			return (-1);
    327 		}
    328 		return (-1);
    329 	}
    330 	if (*code != 'A') {
    331 		/* Kill trailing newline */
    332 		cp = code + strlen(code);
    333 		if (cp > code && *--cp == '\n')
    334 			*cp = '\0';
    335 
    336 		msg("Protocol to remote tape server botched (code \"%s\").\n",
    337 		    code);
    338 		rmtconnaborted();
    339 	}
    340 	return (atoi(code + 1));
    341 }
    342 
    343 int
    344 rmtgetb()
    345 {
    346 	char c;
    347 
    348 	if (read(rmtape, &c, 1) != 1)
    349 		rmtconnaborted();
    350 	return (c);
    351 }
    352 
    353 /* Get a line (guaranteed to have a trailing newline). */
    354 void
    355 rmtgets(line, len)
    356 	char *line;
    357 	int len;
    358 {
    359 	register char *cp = line;
    360 
    361 	while (len > 1) {
    362 		*cp = rmtgetb();
    363 		if (*cp == '\n') {
    364 			cp[1] = '\0';
    365 			return;
    366 		}
    367 		cp++;
    368 		len--;
    369 	}
    370 	*cp = '\0';
    371 	msg("Protocol to remote tape server botched.\n");
    372 	msg("(rmtgets got \"%s\").\n", line);
    373 	rmtconnaborted();
    374 }
    375