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dumprmt.c revision 1.15 
      1 /*	$NetBSD: dumprmt.c,v 1.15 1997/05/27 08:35:27 mrg 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 1.15 1997/05/27 08:35:27 mrg 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/in_systm.h>
     59 #include <netinet/ip.h>
     60 
     61 #include <protocols/dumprestore.h>
     62 
     63 #include <ctype.h>
     64 #include <err.h>
     65 #include <netdb.h>
     66 #include <pwd.h>
     67 #include <signal.h>
     68 #include <stdio.h>
     69 #ifdef __STDC__
     70 #include <stdlib.h>
     71 #include <string.h>
     72 #include <unistd.h>
     73 #endif
     74 
     75 #include "pathnames.h"
     76 #include "dump.h"
     77 
     78 #define	TS_CLOSED	0
     79 #define	TS_OPEN		1
     80 
     81 static	int rmtstate = TS_CLOSED;
     82 static	int rmtape;
     83 static	char *rmtpeer;
     84 
     85 static	int okname __P((char *));
     86 static	int rmtcall __P((char *, char *));
     87 static	void rmtconnaborted __P((/* int, int */));
     88 static	int rmtgetb __P((void));
     89 static	void rmtgetconn __P((void));
     90 static	void rmtgets __P((char *, int));
     91 static	int rmtreply __P((char *));
     92 
     93 extern	int ntrec;		/* blocking factor on tape */
     94 extern	uid_t uid;		/* real uid */
     95 extern	uid_t euid;		/* effective uid */
     96 
     97 int
     98 rmthost(host)
     99 	char *host;
    100 {
    101 
    102 	rmtpeer = malloc(strlen(host) + 1);
    103 	if (rmtpeer)
    104 		strcpy(rmtpeer, host);
    105 	else
    106 		rmtpeer = host;
    107 	signal(SIGPIPE, rmtconnaborted);
    108 	rmtgetconn();
    109 	if (rmtape < 0)
    110 		return (0);
    111 	return (1);
    112 }
    113 
    114 static void
    115 rmtconnaborted()
    116 {
    117 
    118 	errx(1, "Lost connection to remote host.");
    119 }
    120 
    121 void
    122 rmtgetconn()
    123 {
    124 	char *cp;
    125 	static struct servent *sp = NULL;
    126 	static struct passwd *pwd = NULL;
    127 #ifdef notdef
    128 	static int on = 1;
    129 #endif
    130 	char *tuser;
    131 	int size;
    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 	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, tuser,
    151 	    _PATH_RMT, (int *)0);
    152 	if (rmtape < 0)
    153 		return;
    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 }
    165 
    166 static int
    167 okname(cp0)
    168 	char *cp0;
    169 {
    170 	char *cp;
    171 	int c;
    172 
    173 	for (cp = cp0; *cp; cp++) {
    174 		c = *cp;
    175 		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
    176 			warnx("invalid user name: %s", cp0);
    177 			return (0);
    178 		}
    179 	}
    180 	return (1);
    181 }
    182 
    183 int
    184 rmtopen(tape, mode)
    185 	char *tape;
    186 	int mode;
    187 {
    188 	char buf[256];
    189 
    190 	(void)snprintf(buf, sizeof buf, "O%s\n%d\n", tape, mode);
    191 	rmtstate = TS_OPEN;
    192 	return (rmtcall(tape, buf));
    193 }
    194 
    195 void
    196 rmtclose()
    197 {
    198 
    199 	if (rmtstate != TS_OPEN)
    200 		return;
    201 	rmtcall("close", "C\n");
    202 	rmtstate = TS_CLOSED;
    203 }
    204 
    205 int
    206 rmtread(buf, count)
    207 	char *buf;
    208 	int count;
    209 {
    210 	char line[30];
    211 	int n, i, cc;
    212 	extern errno;
    213 
    214 	(void)snprintf(line, sizeof line, "R%d\n", count);
    215 	n = rmtcall("read", line);
    216 	if (n < 0) {
    217 		errno = n;
    218 		return (-1);
    219 	}
    220 	for (i = 0; i < n; i += cc) {
    221 		cc = read(rmtape, buf+i, n - i);
    222 		if (cc <= 0) {
    223 			rmtconnaborted();
    224 		}
    225 	}
    226 	return (n);
    227 }
    228 
    229 int
    230 rmtwrite(buf, count)
    231 	char *buf;
    232 	int count;
    233 {
    234 	char line[30];
    235 
    236 	(void)snprintf(line, sizeof line, "W%d\n", count);
    237 	write(rmtape, line, strlen(line));
    238 	write(rmtape, buf, count);
    239 	return (rmtreply("write"));
    240 }
    241 
    242 void
    243 rmtwrite0(count)
    244 	int count;
    245 {
    246 	char line[30];
    247 
    248 	(void)snprintf(line, sizeof line, "W%d\n", count);
    249 	write(rmtape, line, strlen(line));
    250 }
    251 
    252 void
    253 rmtwrite1(buf, count)
    254 	char *buf;
    255 	int count;
    256 {
    257 
    258 	write(rmtape, buf, count);
    259 }
    260 
    261 int
    262 rmtwrite2()
    263 {
    264 
    265 	return (rmtreply("write"));
    266 }
    267 
    268 int
    269 rmtseek(offset, pos)
    270 	int offset, pos;
    271 {
    272 	char line[80];
    273 
    274 	(void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos);
    275 	return (rmtcall("seek", line));
    276 }
    277 
    278 struct	mtget mts;
    279 
    280 struct mtget *
    281 rmtstatus()
    282 {
    283 	int i;
    284 	char *cp;
    285 
    286 	if (rmtstate != TS_OPEN)
    287 		return (NULL);
    288 	rmtcall("status", "S\n");
    289 	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
    290 		*cp++ = rmtgetb();
    291 	return (&mts);
    292 }
    293 
    294 int
    295 rmtioctl(cmd, count)
    296 	int cmd, count;
    297 {
    298 	char buf[256];
    299 
    300 	if (count < 0)
    301 		return (-1);
    302 	(void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count);
    303 	return (rmtcall("ioctl", buf));
    304 }
    305 
    306 static int
    307 rmtcall(cmd, buf)
    308 	char *cmd, *buf;
    309 {
    310 
    311 	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
    312 		rmtconnaborted();
    313 	return (rmtreply(cmd));
    314 }
    315 
    316 static int
    317 rmtreply(cmd)
    318 	char *cmd;
    319 {
    320 	char *cp;
    321 	char code[30], emsg[BUFSIZ];
    322 
    323 	rmtgets(code, sizeof (code));
    324 	if (*code == 'E' || *code == 'F') {
    325 		rmtgets(emsg, sizeof (emsg));
    326 		msg("%s: %s", cmd, emsg);
    327 		if (*code == 'F') {
    328 			rmtstate = TS_CLOSED;
    329 			return (-1);
    330 		}
    331 		return (-1);
    332 	}
    333 	if (*code != 'A') {
    334 		/* Kill trailing newline */
    335 		cp = code + strlen(code);
    336 		if (cp > code && *--cp == '\n')
    337 			*cp = '\0';
    338 
    339 		msg("Protocol to remote tape server botched (code \"%s\").\n",
    340 		    code);
    341 		rmtconnaborted();
    342 	}
    343 	return (atoi(code + 1));
    344 }
    345 
    346 int
    347 rmtgetb()
    348 {
    349 	char c;
    350 
    351 	if (read(rmtape, &c, 1) != 1)
    352 		rmtconnaborted();
    353 	return (c);
    354 }
    355 
    356 /* Get a line (guaranteed to have a trailing newline). */
    357 void
    358 rmtgets(line, len)
    359 	char *line;
    360 	int len;
    361 {
    362 	char *cp = line;
    363 
    364 	while (len > 1) {
    365 		*cp = rmtgetb();
    366 		if (*cp == '\n') {
    367 			cp[1] = '\0';
    368 			return;
    369 		}
    370 		cp++;
    371 		len--;
    372 	}
    373 	*cp = '\0';
    374 	msg("Protocol to remote tape server botched.\n");
    375 	msg("(rmtgets got \"%s\").\n", line);
    376 	rmtconnaborted();
    377 }
    378