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dumprmt.c revision 1.10 
      1 /*	$NetBSD: dumprmt.c,v 1.10 1996/03/15 22:39:26 scottr 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 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)dumprmt.c	8.1 (Berkeley) 6/5/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: dumprmt.c,v 1.10 1996/03/15 22:39:26 scottr Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include <sys/param.h>
     45 #include <sys/mtio.h>
     46 #include <sys/ioctl.h>
     47 #include <sys/socket.h>
     48 #include <sys/time.h>
     49 #ifdef sunos
     50 #include <sys/vnode.h>
     51 
     52 #include <ufs/inode.h>
     53 #else
     54 #include <ufs/ufs/dinode.h>
     55 #endif
     56 
     57 #include <netinet/in.h>
     58 #include <netinet/tcp.h>
     59 
     60 #include <protocols/dumprestore.h>
     61 
     62 #include <ctype.h>
     63 #include <err.h>
     64 #include <netdb.h>
     65 #include <pwd.h>
     66 #include <signal.h>
     67 #include <stdio.h>
     68 #ifdef __STDC__
     69 #include <stdlib.h>
     70 #include <string.h>
     71 #include <unistd.h>
     72 #endif
     73 
     74 #include "pathnames.h"
     75 #include "dump.h"
     76 
     77 #define	TS_CLOSED	0
     78 #define	TS_OPEN		1
     79 
     80 static	int rmtstate = TS_CLOSED;
     81 static	int rmtape;
     82 static	char *rmtpeer;
     83 
     84 static	int okname __P((char *));
     85 static	int rmtcall __P((char *, char *));
     86 static	void rmtconnaborted __P((/* int, int */));
     87 static	int rmtgetb __P((void));
     88 static	void rmtgetconn __P((void));
     89 static	void rmtgets __P((char *, int));
     90 static	int rmtreply __P((char *));
     91 
     92 extern	int ntrec;		/* blocking factor on tape */
     93 extern	uid_t uid;		/* real uid */
     94 extern	uid_t euid;		/* effective uid */
     95 
     96 int
     97 rmthost(host)
     98 	char *host;
     99 {
    100 
    101 	rmtpeer = malloc(strlen(host) + 1);
    102 	if (rmtpeer)
    103 		strcpy(rmtpeer, host);
    104 	else
    105 		rmtpeer = host;
    106 	signal(SIGPIPE, rmtconnaborted);
    107 	rmtgetconn();
    108 	if (rmtape < 0)
    109 		return (0);
    110 	return (1);
    111 }
    112 
    113 static void
    114 rmtconnaborted()
    115 {
    116 
    117 	errx(1, "Lost connection to remote host.");
    118 }
    119 
    120 void
    121 rmtgetconn()
    122 {
    123 	register char *cp;
    124 	static struct servent *sp = NULL;
    125 	static struct passwd *pwd = NULL;
    126 #ifdef notdef
    127 	static int on = 1;
    128 #endif
    129 	char *tuser;
    130 	int size;
    131 	int maxseg;
    132 
    133 	if (sp == NULL) {
    134 		sp = getservbyname("shell", "tcp");
    135 		if (sp == NULL)
    136 			errx(1, "shell/tcp: unknown service");
    137 		pwd = getpwuid(getuid());
    138 		if (pwd == NULL)
    139 			errx(1, "who are you?");
    140 	}
    141 	if ((cp = strchr(rmtpeer, '@')) != NULL) {
    142 		tuser = rmtpeer;
    143 		*cp = '\0';
    144 		if (!okname(tuser))
    145 			exit(1);
    146 		rmtpeer = ++cp;
    147 	} else
    148 		tuser = pwd->pw_name;
    149 
    150 	(void) seteuid(euid);
    151 	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, tuser,
    152 	    _PATH_RMT, (int *)0);
    153 	(void) setuid(uid);	/* Just to be Really Really safe */
    154 
    155 	size = ntrec * TP_BSIZE;
    156 	if (size > 60 * 1024)		/* XXX */
    157 		size = 60 * 1024;
    158 	/* Leave some space for rmt request/response protocol */
    159 	size += 2 * 1024;
    160 	while (size > TP_BSIZE &&
    161 	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
    162 		    size -= TP_BSIZE;
    163 	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
    164 	maxseg = 1024;
    165 	if (setsockopt(rmtape, IPPROTO_TCP, TCP_MAXSEG,
    166 	    &maxseg, sizeof (maxseg)) < 0)
    167 		perror("TCP_MAXSEG setsockopt");
    168 
    169 #ifdef notdef
    170 	if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
    171 		perror("TCP_NODELAY setsockopt");
    172 #endif
    173 }
    174 
    175 static int
    176 okname(cp0)
    177 	char *cp0;
    178 {
    179 	register char *cp;
    180 	register int c;
    181 
    182 	for (cp = cp0; *cp; cp++) {
    183 		c = *cp;
    184 		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
    185 			warnx("invalid user name: %s", cp0);
    186 			return (0);
    187 		}
    188 	}
    189 	return (1);
    190 }
    191 
    192 int
    193 rmtopen(tape, mode)
    194 	char *tape;
    195 	int mode;
    196 {
    197 	char buf[256];
    198 
    199 	(void)sprintf(buf, "O%s\n%d\n", tape, mode);
    200 	rmtstate = TS_OPEN;
    201 	return (rmtcall(tape, buf));
    202 }
    203 
    204 void
    205 rmtclose()
    206 {
    207 
    208 	if (rmtstate != TS_OPEN)
    209 		return;
    210 	rmtcall("close", "C\n");
    211 	rmtstate = TS_CLOSED;
    212 }
    213 
    214 int
    215 rmtread(buf, count)
    216 	char *buf;
    217 	int count;
    218 {
    219 	char line[30];
    220 	int n, i, cc;
    221 	extern errno;
    222 
    223 	(void)sprintf(line, "R%d\n", count);
    224 	n = rmtcall("read", line);
    225 	if (n < 0) {
    226 		errno = n;
    227 		return (-1);
    228 	}
    229 	for (i = 0; i < n; i += cc) {
    230 		cc = read(rmtape, buf+i, n - i);
    231 		if (cc <= 0) {
    232 			rmtconnaborted();
    233 		}
    234 	}
    235 	return (n);
    236 }
    237 
    238 int
    239 rmtwrite(buf, count)
    240 	char *buf;
    241 	int count;
    242 {
    243 	char line[30];
    244 
    245 	(void)sprintf(line, "W%d\n", count);
    246 	write(rmtape, line, strlen(line));
    247 	write(rmtape, buf, count);
    248 	return (rmtreply("write"));
    249 }
    250 
    251 void
    252 rmtwrite0(count)
    253 	int count;
    254 {
    255 	char line[30];
    256 
    257 	(void)sprintf(line, "W%d\n", count);
    258 	write(rmtape, line, strlen(line));
    259 }
    260 
    261 void
    262 rmtwrite1(buf, count)
    263 	char *buf;
    264 	int count;
    265 {
    266 
    267 	write(rmtape, buf, count);
    268 }
    269 
    270 int
    271 rmtwrite2()
    272 {
    273 
    274 	return (rmtreply("write"));
    275 }
    276 
    277 int
    278 rmtseek(offset, pos)
    279 	int offset, pos;
    280 {
    281 	char line[80];
    282 
    283 	(void)sprintf(line, "L%d\n%d\n", offset, pos);
    284 	return (rmtcall("seek", line));
    285 }
    286 
    287 struct	mtget mts;
    288 
    289 struct mtget *
    290 rmtstatus()
    291 {
    292 	register int i;
    293 	register char *cp;
    294 
    295 	if (rmtstate != TS_OPEN)
    296 		return (NULL);
    297 	rmtcall("status", "S\n");
    298 	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
    299 		*cp++ = rmtgetb();
    300 	return (&mts);
    301 }
    302 
    303 int
    304 rmtioctl(cmd, count)
    305 	int cmd, count;
    306 {
    307 	char buf[256];
    308 
    309 	if (count < 0)
    310 		return (-1);
    311 	(void)sprintf(buf, "I%d\n%d\n", cmd, count);
    312 	return (rmtcall("ioctl", buf));
    313 }
    314 
    315 static int
    316 rmtcall(cmd, buf)
    317 	char *cmd, *buf;
    318 {
    319 
    320 	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
    321 		rmtconnaborted();
    322 	return (rmtreply(cmd));
    323 }
    324 
    325 static int
    326 rmtreply(cmd)
    327 	char *cmd;
    328 {
    329 	register char *cp;
    330 	char code[30], emsg[BUFSIZ];
    331 
    332 	rmtgets(code, sizeof (code));
    333 	if (*code == 'E' || *code == 'F') {
    334 		rmtgets(emsg, sizeof (emsg));
    335 		msg("%s: %s", cmd, emsg);
    336 		if (*code == 'F') {
    337 			rmtstate = TS_CLOSED;
    338 			return (-1);
    339 		}
    340 		return (-1);
    341 	}
    342 	if (*code != 'A') {
    343 		/* Kill trailing newline */
    344 		cp = code + strlen(code);
    345 		if (cp > code && *--cp == '\n')
    346 			*cp = '\0';
    347 
    348 		msg("Protocol to remote tape server botched (code \"%s\").\n",
    349 		    code);
    350 		rmtconnaborted();
    351 	}
    352 	return (atoi(code + 1));
    353 }
    354 
    355 int
    356 rmtgetb()
    357 {
    358 	char c;
    359 
    360 	if (read(rmtape, &c, 1) != 1)
    361 		rmtconnaborted();
    362 	return (c);
    363 }
    364 
    365 /* Get a line (guaranteed to have a trailing newline). */
    366 void
    367 rmtgets(line, len)
    368 	char *line;
    369 	int len;
    370 {
    371 	register char *cp = line;
    372 
    373 	while (len > 1) {
    374 		*cp = rmtgetb();
    375 		if (*cp == '\n') {
    376 			cp[1] = '\0';
    377 			return;
    378 		}
    379 		cp++;
    380 		len--;
    381 	}
    382 	*cp = '\0';
    383 	msg("Protocol to remote tape server botched.\n");
    384 	msg("(rmtgets got \"%s\").\n", line);
    385 	rmtconnaborted();
    386 }
    387