Home | History | Annotate | Line # | Download | only in dump
dumprmt.c revision 1.23 
      1 /*	$NetBSD: dumprmt.c,v 1.23 2001/05/26 07:48:15 lukem 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 1.23 2001/05/26 07:48:15 lukem 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 static	void	rmtconnaborted __P((int));
     91 static	int	rmtgetb __P((void));
     92 static	void	rmtgetconn __P((void));
     93 static	void	rmtgets __P((char *, int));
     94 	int	rmtioctl __P((int, int));
     95 	int	rmtread __P((char *, int));
     96 static	int	rmtreply __P((char *));
     97 	int	rmtseek __P((int, int));
     98 
     99 extern	int ntrec;		/* blocking factor on tape */
    100 
    101 int
    102 rmthost(host)
    103 	char *host;
    104 {
    105 
    106 	if ((rmtpeer = strdup(host)) == NULL)
    107 		err(1, "strdup");
    108 	signal(SIGPIPE, rmtconnaborted);
    109 	rmtgetconn();
    110 	if (rmtape < 0)
    111 		return (0);
    112 	return (1);
    113 }
    114 
    115 static void
    116 rmtconnaborted(dummy)
    117 	int dummy;
    118 {
    119 
    120 	errx(1, "Lost connection to remote host.");
    121 }
    122 
    123 void
    124 rmtgetconn()
    125 {
    126 	char *cp;
    127 	static struct servent *sp = NULL;
    128 	static struct passwd *pwd = NULL;
    129 	char *tuser, *name;
    130 	int size, opt;
    131 
    132 	if (sp == NULL) {
    133 		sp = getservbyname("shell", "tcp");
    134 		if (sp == NULL)
    135 			errx(1, "shell/tcp: unknown service");
    136 		pwd = getpwuid(getuid());
    137 		if (pwd == NULL)
    138 			errx(1, "who are you?");
    139 	}
    140 	if ((name = strdup(pwd->pw_name)) == NULL)
    141 		err(1, "strdup");
    142 	if ((cp = strchr(rmtpeer, '@')) != NULL) {
    143 		tuser = rmtpeer;
    144 		*cp = '\0';
    145 		if (!okname(tuser))
    146 			exit(1);
    147 		rmtpeer = ++cp;
    148 	} else
    149 		tuser = name;
    150 
    151 	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT,
    152 	    (int *)0);
    153 	(void)free(name);
    154 	if (rmtape < 0)
    155 		return;
    156 
    157 	size = ntrec * TP_BSIZE;
    158 	if (size > 60 * 1024)		/* XXX */
    159 		size = 60 * 1024;
    160 	/* Leave some space for rmt request/response protocol */
    161 	size += 2 * 1024;
    162 	while (size > TP_BSIZE &&
    163 	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
    164 		    size -= TP_BSIZE;
    165 	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
    166 
    167 	opt = IPTOS_THROUGHPUT;
    168 	(void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt));
    169 
    170 	opt = 1;
    171 	(void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt));
    172 }
    173 
    174 static int
    175 okname(cp0)
    176 	char *cp0;
    177 {
    178 	char *cp;
    179 	int c;
    180 
    181 	for (cp = cp0; *cp; cp++) {
    182 		c = *cp;
    183 		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
    184 			warnx("invalid user name: %s", cp0);
    185 			return (0);
    186 		}
    187 	}
    188 	return (1);
    189 }
    190 
    191 int
    192 rmtopen(tape, mode)
    193 	char *tape;
    194 	int mode;
    195 {
    196 	char buf[256];
    197 
    198 	(void)snprintf(buf, sizeof buf, "O%s\n%d\n", tape, mode);
    199 	rmtstate = TS_OPEN;
    200 	return (rmtcall(tape, buf));
    201 }
    202 
    203 void
    204 rmtclose()
    205 {
    206 
    207 	if (rmtstate != TS_OPEN)
    208 		return;
    209 	rmtcall("close", "C\n");
    210 	rmtstate = TS_CLOSED;
    211 }
    212 
    213 int
    214 rmtread(buf, count)
    215 	char *buf;
    216 	int count;
    217 {
    218 	char line[30];
    219 	int n, i, cc;
    220 
    221 	(void)snprintf(line, sizeof line, "R%d\n", count);
    222 	n = rmtcall("read", line);
    223 	if (n < 0) {
    224 		errno = n;
    225 		return (-1);
    226 	}
    227 	for (i = 0; i < n; i += cc) {
    228 		cc = read(rmtape, buf+i, n - i);
    229 		if (cc <= 0) {
    230 			rmtconnaborted(0);
    231 		}
    232 	}
    233 	return (n);
    234 }
    235 
    236 int
    237 rmtwrite(buf, count)
    238 	char *buf;
    239 	int count;
    240 {
    241 	char line[30];
    242 
    243 	(void)snprintf(line, sizeof line, "W%d\n", count);
    244 	write(rmtape, line, strlen(line));
    245 	write(rmtape, buf, count);
    246 	return (rmtreply("write"));
    247 }
    248 
    249 #if 0		/* XXX unused? */
    250 void
    251 rmtwrite0(count)
    252 	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
    261 rmtwrite1(buf, count)
    262 	char *buf;
    263 	int count;
    264 {
    265 
    266 	write(rmtape, buf, count);
    267 }
    268 
    269 int
    270 rmtwrite2()
    271 {
    272 
    273 	return (rmtreply("write"));
    274 }
    275 #endif
    276 
    277 int
    278 rmtseek(offset, pos)
    279 	int offset, pos;
    280 {
    281 	char line[80];
    282 
    283 	(void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos);
    284 	return (rmtcall("seek", line));
    285 }
    286 
    287 
    288 #if 0		/* XXX unused? */
    289 struct mtget *
    290 rmtstatus()
    291 {
    292 	struct	mtget mts;
    293 	int i;
    294 	char *cp;
    295 
    296 	if (rmtstate != TS_OPEN)
    297 		return (NULL);
    298 	rmtcall("status", "S\n");
    299 	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
    300 		*cp++ = rmtgetb();
    301 	return (&mts);
    302 }
    303 #endif
    304 
    305 int
    306 rmtioctl(cmd, count)
    307 	int cmd, count;
    308 {
    309 	char buf[256];
    310 
    311 	if (count < 0)
    312 		return (-1);
    313 	(void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count);
    314 	return (rmtcall("ioctl", buf));
    315 }
    316 
    317 static int
    318 rmtcall(cmd, buf)
    319 	char *cmd, *buf;
    320 {
    321 
    322 	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
    323 		rmtconnaborted(0);
    324 	return (rmtreply(cmd));
    325 }
    326 
    327 static int
    328 rmtreply(cmd)
    329 	char *cmd;
    330 {
    331 	char *cp;
    332 	char code[30], emsg[BUFSIZ];
    333 
    334 	rmtgets(code, sizeof (code));
    335 	if (*code == 'E' || *code == 'F') {
    336 		rmtgets(emsg, sizeof (emsg));
    337 		msg("%s: %s", cmd, emsg);
    338 		if (*code == 'F') {
    339 			rmtstate = TS_CLOSED;
    340 			return (-1);
    341 		}
    342 		return (-1);
    343 	}
    344 	if (*code != 'A') {
    345 		/* Kill trailing newline */
    346 		cp = code + strlen(code);
    347 		if (cp > code && *--cp == '\n')
    348 			*cp = '\0';
    349 
    350 		msg("Protocol to remote tape server botched (code \"%s\").\n",
    351 		    code);
    352 		rmtconnaborted(0);
    353 	}
    354 	return (atoi(code + 1));
    355 }
    356 
    357 int
    358 rmtgetb()
    359 {
    360 	char c;
    361 
    362 	if (read(rmtape, &c, 1) != 1)
    363 		rmtconnaborted(0);
    364 	return (c);
    365 }
    366 
    367 /* Get a line (guaranteed to have a trailing newline). */
    368 void
    369 rmtgets(line, len)
    370 	char *line;
    371 	int len;
    372 {
    373 	char *cp = line;
    374 
    375 	while (len > 1) {
    376 		*cp = rmtgetb();
    377 		if (*cp == '\n') {
    378 			cp[1] = '\0';
    379 			return;
    380 		}
    381 		cp++;
    382 		len--;
    383 	}
    384 	*cp = '\0';
    385 	msg("Protocol to remote tape server botched.\n");
    386 	msg("(rmtgets got \"%s\").\n", line);
    387 	rmtconnaborted(0);
    388 }
    389