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dumprmt.c revision 1.21 
      1 /*	$NetBSD: dumprmt.c,v 1.21 1998/07/30 18:14:00 thorpej Exp $	*/
      2 
      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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)dumprmt.c	8.3 (Berkeley) 4/28/95";
     40 #else
     41 __RCSID("$NetBSD: dumprmt.c,v 1.21 1998/07/30 18:14:00 thorpej Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/mtio.h>
     47 #include <sys/ioctl.h>
     48 #include <sys/socket.h>
     49 #include <sys/time.h>
     50 #ifdef sunos
     51 #include <sys/vnode.h>
     52 
     53 #include <ufs/inode.h>
     54 #else
     55 #include <ufs/ufs/dinode.h>
     56 #endif
     57 
     58 #include <netinet/in.h>
     59 #include <netinet/in_systm.h>
     60 #include <netinet/ip.h>
     61 #include <netinet/tcp.h>
     62 
     63 #include <protocols/dumprestore.h>
     64 
     65 #include <ctype.h>
     66 #include <err.h>
     67 #include <errno.h>
     68 #include <netdb.h>
     69 #include <pwd.h>
     70 #include <signal.h>
     71 #include <stdio.h>
     72 #ifdef __STDC__
     73 #include <stdlib.h>
     74 #include <string.h>
     75 #include <unistd.h>
     76 #endif
     77 
     78 #include "pathnames.h"
     79 #include "dump.h"
     80 
     81 #define	TS_CLOSED	0
     82 #define	TS_OPEN		1
     83 
     84 static	int rmtstate = TS_CLOSED;
     85 static	int rmtape;
     86 static	char *rmtpeer;
     87 
     88 static	int	okname __P((char *));
     89 static	int	rmtcall __P((char *, char *));
     90 	void	rmtclose __P((void));
     91 static	void	rmtconnaborted __P((int));
     92 static	int	rmtgetb __P((void));
     93 static	void	rmtgetconn __P((void));
     94 static	void	rmtgets __P((char *, int));
     95 	int	rmthost __P((char *));
     96 	int	rmtioctl __P((int, int));
     97 	int	rmtopen __P((char *, int));
     98 	int	rmtread __P((char *, int));
     99 static	int	rmtreply __P((char *));
    100 	int	rmtseek __P((int, int));
    101 	int	rmtwrite __P((char *, int));
    102 
    103 extern	int ntrec;		/* blocking factor on tape */
    104 
    105 int
    106 rmthost(host)
    107 	char *host;
    108 {
    109 
    110 	rmtpeer = malloc(strlen(host) + 1);
    111 	if (rmtpeer)
    112 		strcpy(rmtpeer, host);
    113 	else
    114 		rmtpeer = host;
    115 	signal(SIGPIPE, rmtconnaborted);
    116 	rmtgetconn();
    117 	if (rmtape < 0)
    118 		return (0);
    119 	return (1);
    120 }
    121 
    122 static void
    123 rmtconnaborted(dummy)
    124 	int dummy;
    125 {
    126 
    127 	errx(1, "Lost connection to remote host.");
    128 }
    129 
    130 void
    131 rmtgetconn()
    132 {
    133 	char *cp;
    134 	static struct servent *sp = NULL;
    135 	static struct passwd *pwd = NULL;
    136 	char *tuser, *name;
    137 	int size, opt;
    138 
    139 	if (sp == NULL) {
    140 		sp = getservbyname("shell", "tcp");
    141 		if (sp == NULL)
    142 			errx(1, "shell/tcp: unknown service");
    143 		pwd = getpwuid(getuid());
    144 		if (pwd == NULL)
    145 			errx(1, "who are you?");
    146 	}
    147 	if ((name = strdup(pwd->pw_name)) == NULL)
    148 		err(1, "malloc");
    149 	if ((cp = strchr(rmtpeer, '@')) != NULL) {
    150 		tuser = rmtpeer;
    151 		*cp = '\0';
    152 		if (!okname(tuser))
    153 			exit(1);
    154 		rmtpeer = ++cp;
    155 	} else
    156 		tuser = name;
    157 
    158 	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT,
    159 	    (int *)0);
    160 	(void)free(name);
    161 	if (rmtape < 0)
    162 		return;
    163 
    164 	size = ntrec * TP_BSIZE;
    165 	if (size > 60 * 1024)		/* XXX */
    166 		size = 60 * 1024;
    167 	/* Leave some space for rmt request/response protocol */
    168 	size += 2 * 1024;
    169 	while (size > TP_BSIZE &&
    170 	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
    171 		    size -= TP_BSIZE;
    172 	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
    173 
    174 	opt = IPTOS_THROUGHPUT;
    175 	(void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt));
    176 
    177 	opt = 1;
    178 	(void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt));
    179 }
    180 
    181 static int
    182 okname(cp0)
    183 	char *cp0;
    184 {
    185 	char *cp;
    186 	int c;
    187 
    188 	for (cp = cp0; *cp; cp++) {
    189 		c = *cp;
    190 		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
    191 			warnx("invalid user name: %s", cp0);
    192 			return (0);
    193 		}
    194 	}
    195 	return (1);
    196 }
    197 
    198 int
    199 rmtopen(tape, mode)
    200 	char *tape;
    201 	int mode;
    202 {
    203 	char buf[256];
    204 
    205 	(void)snprintf(buf, sizeof buf, "O%s\n%d\n", tape, mode);
    206 	rmtstate = TS_OPEN;
    207 	return (rmtcall(tape, buf));
    208 }
    209 
    210 void
    211 rmtclose()
    212 {
    213 
    214 	if (rmtstate != TS_OPEN)
    215 		return;
    216 	rmtcall("close", "C\n");
    217 	rmtstate = TS_CLOSED;
    218 }
    219 
    220 int
    221 rmtread(buf, count)
    222 	char *buf;
    223 	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 		errno = n;
    232 		return (-1);
    233 	}
    234 	for (i = 0; i < n; i += cc) {
    235 		cc = read(rmtape, buf+i, n - i);
    236 		if (cc <= 0) {
    237 			rmtconnaborted(0);
    238 		}
    239 	}
    240 	return (n);
    241 }
    242 
    243 int
    244 rmtwrite(buf, count)
    245 	char *buf;
    246 	int count;
    247 {
    248 	char line[30];
    249 
    250 	(void)snprintf(line, sizeof line, "W%d\n", count);
    251 	write(rmtape, line, strlen(line));
    252 	write(rmtape, buf, count);
    253 	return (rmtreply("write"));
    254 }
    255 
    256 #if 0		/* XXX unused? */
    257 void
    258 rmtwrite0(count)
    259 	int count;
    260 {
    261 	char line[30];
    262 
    263 	(void)snprintf(line, sizeof line, "W%d\n", count);
    264 	write(rmtape, line, strlen(line));
    265 }
    266 
    267 void
    268 rmtwrite1(buf, count)
    269 	char *buf;
    270 	int count;
    271 {
    272 
    273 	write(rmtape, buf, count);
    274 }
    275 
    276 int
    277 rmtwrite2()
    278 {
    279 
    280 	return (rmtreply("write"));
    281 }
    282 #endif
    283 
    284 int
    285 rmtseek(offset, pos)
    286 	int offset, pos;
    287 {
    288 	char line[80];
    289 
    290 	(void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos);
    291 	return (rmtcall("seek", line));
    292 }
    293 
    294 
    295 #if 0		/* XXX unused? */
    296 struct mtget *
    297 rmtstatus()
    298 {
    299 	struct	mtget mts;
    300 	int i;
    301 	char *cp;
    302 
    303 	if (rmtstate != TS_OPEN)
    304 		return (NULL);
    305 	rmtcall("status", "S\n");
    306 	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
    307 		*cp++ = rmtgetb();
    308 	return (&mts);
    309 }
    310 #endif
    311 
    312 int
    313 rmtioctl(cmd, count)
    314 	int cmd, count;
    315 {
    316 	char buf[256];
    317 
    318 	if (count < 0)
    319 		return (-1);
    320 	(void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count);
    321 	return (rmtcall("ioctl", buf));
    322 }
    323 
    324 static int
    325 rmtcall(cmd, buf)
    326 	char *cmd, *buf;
    327 {
    328 
    329 	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
    330 		rmtconnaborted(0);
    331 	return (rmtreply(cmd));
    332 }
    333 
    334 static int
    335 rmtreply(cmd)
    336 	char *cmd;
    337 {
    338 	char *cp;
    339 	char code[30], emsg[BUFSIZ];
    340 
    341 	rmtgets(code, sizeof (code));
    342 	if (*code == 'E' || *code == 'F') {
    343 		rmtgets(emsg, sizeof (emsg));
    344 		msg("%s: %s", cmd, emsg);
    345 		if (*code == 'F') {
    346 			rmtstate = TS_CLOSED;
    347 			return (-1);
    348 		}
    349 		return (-1);
    350 	}
    351 	if (*code != 'A') {
    352 		/* Kill trailing newline */
    353 		cp = code + strlen(code);
    354 		if (cp > code && *--cp == '\n')
    355 			*cp = '\0';
    356 
    357 		msg("Protocol to remote tape server botched (code \"%s\").\n",
    358 		    code);
    359 		rmtconnaborted(0);
    360 	}
    361 	return (atoi(code + 1));
    362 }
    363 
    364 int
    365 rmtgetb()
    366 {
    367 	char c;
    368 
    369 	if (read(rmtape, &c, 1) != 1)
    370 		rmtconnaborted(0);
    371 	return (c);
    372 }
    373 
    374 /* Get a line (guaranteed to have a trailing newline). */
    375 void
    376 rmtgets(line, len)
    377 	char *line;
    378 	int len;
    379 {
    380 	char *cp = line;
    381 
    382 	while (len > 1) {
    383 		*cp = rmtgetb();
    384 		if (*cp == '\n') {
    385 			cp[1] = '\0';
    386 			return;
    387 		}
    388 		cp++;
    389 		len--;
    390 	}
    391 	*cp = '\0';
    392 	msg("Protocol to remote tape server botched.\n");
    393 	msg("(rmtgets got \"%s\").\n", line);
    394 	rmtconnaborted(0);
    395 }
    396