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dumprmt.c revision 1.24 
      1 /*	$NetBSD: dumprmt.c,v 1.24 2001/05/27 14:17:56 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 1.24 2001/05/27 14:17:56 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(char *);
     89 static	int	rmtcall(char *, char *);
     90 static	void	rmtconnaborted(int);
     91 static	int	rmtgetb(void);
     92 static	void	rmtgetconn(void);
     93 static	void	rmtgets(char *, int);
     94 	int	rmtioctl(int, int);
     95 	int	rmtread(char *, int);
     96 static	int	rmtreply(char *);
     97 	int	rmtseek(int, int);
     98 
     99 extern	int ntrec;		/* blocking factor on tape */
    100 
    101 int
    102 rmthost(char *host)
    103 {
    104 
    105 	if ((rmtpeer = strdup(host)) == NULL)
    106 		err(1, "strdup");
    107 	signal(SIGPIPE, rmtconnaborted);
    108 	rmtgetconn();
    109 	if (rmtape < 0)
    110 		return (0);
    111 	return (1);
    112 }
    113 
    114 static void
    115 rmtconnaborted(int dummy)
    116 {
    117 
    118 	errx(1, "Lost connection to remote host.");
    119 }
    120 
    121 void
    122 rmtgetconn(void)
    123 {
    124 	char *cp;
    125 	static struct servent *sp = NULL;
    126 	static struct passwd *pwd = NULL;
    127 	char *tuser, *name;
    128 	int size, opt;
    129 
    130 	if (sp == NULL) {
    131 		sp = getservbyname("shell", "tcp");
    132 		if (sp == NULL)
    133 			errx(1, "shell/tcp: unknown service");
    134 		pwd = getpwuid(getuid());
    135 		if (pwd == NULL)
    136 			errx(1, "who are you?");
    137 	}
    138 	if ((name = strdup(pwd->pw_name)) == NULL)
    139 		err(1, "strdup");
    140 	if ((cp = strchr(rmtpeer, '@')) != NULL) {
    141 		tuser = rmtpeer;
    142 		*cp = '\0';
    143 		if (!okname(tuser))
    144 			exit(1);
    145 		rmtpeer = ++cp;
    146 	} else
    147 		tuser = name;
    148 
    149 	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT,
    150 	    (int *)0);
    151 	(void)free(name);
    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 	opt = IPTOS_THROUGHPUT;
    166 	(void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt));
    167 
    168 	opt = 1;
    169 	(void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt));
    170 }
    171 
    172 static int
    173 okname(char *cp0)
    174 {
    175 	char *cp;
    176 	int c;
    177 
    178 	for (cp = cp0; *cp; cp++) {
    179 		c = *cp;
    180 		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
    181 			warnx("invalid user name: %s", cp0);
    182 			return (0);
    183 		}
    184 	}
    185 	return (1);
    186 }
    187 
    188 int
    189 rmtopen(char *tape, int mode)
    190 {
    191 	char buf[256];
    192 
    193 	(void)snprintf(buf, sizeof buf, "O%s\n%d\n", tape, mode);
    194 	rmtstate = TS_OPEN;
    195 	return (rmtcall(tape, buf));
    196 }
    197 
    198 void
    199 rmtclose(void)
    200 {
    201 
    202 	if (rmtstate != TS_OPEN)
    203 		return;
    204 	rmtcall("close", "C\n");
    205 	rmtstate = TS_CLOSED;
    206 }
    207 
    208 int
    209 rmtread(char *buf, int count)
    210 {
    211 	char line[30];
    212 	int n, i, cc;
    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(0);
    224 		}
    225 	}
    226 	return (n);
    227 }
    228 
    229 int
    230 rmtwrite(char *buf, int count)
    231 {
    232 	char line[30];
    233 
    234 	(void)snprintf(line, sizeof line, "W%d\n", count);
    235 	write(rmtape, line, strlen(line));
    236 	write(rmtape, buf, count);
    237 	return (rmtreply("write"));
    238 }
    239 
    240 #if 0		/* XXX unused? */
    241 void
    242 rmtwrite0(int count)
    243 {
    244 	char line[30];
    245 
    246 	(void)snprintf(line, sizeof line, "W%d\n", count);
    247 	write(rmtape, line, strlen(line));
    248 }
    249 
    250 void
    251 rmtwrite1(char *buf, int count)
    252 {
    253 
    254 	write(rmtape, buf, count);
    255 }
    256 
    257 int
    258 rmtwrite2(void)
    259 {
    260 
    261 	return (rmtreply("write"));
    262 }
    263 #endif
    264 
    265 int
    266 rmtseek(int offset, int pos)
    267 {
    268 	char line[80];
    269 
    270 	(void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos);
    271 	return (rmtcall("seek", line));
    272 }
    273 
    274 
    275 #if 0		/* XXX unused? */
    276 struct mtget *
    277 rmtstatus(void)
    278 {
    279 	struct	mtget mts;
    280 	int i;
    281 	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 #endif
    291 
    292 int
    293 rmtioctl(int cmd, int count)
    294 {
    295 	char buf[256];
    296 
    297 	if (count < 0)
    298 		return (-1);
    299 	(void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count);
    300 	return (rmtcall("ioctl", buf));
    301 }
    302 
    303 static int
    304 rmtcall(char *cmd, char *buf)
    305 {
    306 
    307 	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
    308 		rmtconnaborted(0);
    309 	return (rmtreply(cmd));
    310 }
    311 
    312 static int
    313 rmtreply(char *cmd)
    314 {
    315 	char *cp;
    316 	char code[30], emsg[BUFSIZ];
    317 
    318 	rmtgets(code, sizeof (code));
    319 	if (*code == 'E' || *code == 'F') {
    320 		rmtgets(emsg, sizeof (emsg));
    321 		msg("%s: %s", cmd, emsg);
    322 		if (*code == 'F') {
    323 			rmtstate = TS_CLOSED;
    324 			return (-1);
    325 		}
    326 		return (-1);
    327 	}
    328 	if (*code != 'A') {
    329 		/* Kill trailing newline */
    330 		cp = code + strlen(code);
    331 		if (cp > code && *--cp == '\n')
    332 			*cp = '\0';
    333 
    334 		msg("Protocol to remote tape server botched (code \"%s\").\n",
    335 		    code);
    336 		rmtconnaborted(0);
    337 	}
    338 	return (atoi(code + 1));
    339 }
    340 
    341 int
    342 rmtgetb(void)
    343 {
    344 	char c;
    345 
    346 	if (read(rmtape, &c, 1) != 1)
    347 		rmtconnaborted(0);
    348 	return (c);
    349 }
    350 
    351 /* Get a line (guaranteed to have a trailing newline). */
    352 void
    353 rmtgets(char *line, int len)
    354 {
    355 	char *cp = line;
    356 
    357 	while (len > 1) {
    358 		*cp = rmtgetb();
    359 		if (*cp == '\n') {
    360 			cp[1] = '\0';
    361 			return;
    362 		}
    363 		cp++;
    364 		len--;
    365 	}
    366 	*cp = '\0';
    367 	msg("Protocol to remote tape server botched.\n");
    368 	msg("(rmtgets got \"%s\").\n", line);
    369 	rmtconnaborted(0);
    370 }
    371