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dumprmt.c revision 1.27 
      1 /*	$NetBSD: dumprmt.c,v 1.27 2001/12/14 14:43:33 bouyer 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 1.27 2001/12/14 14:43:33 bouyer 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 #include <stdlib.h>
     73 #include <string.h>
     74 #include <unistd.h>
     75 
     76 #include "pathnames.h"
     77 #include "dump.h"
     78 
     79 #define	TS_CLOSED	0
     80 #define	TS_OPEN		1
     81 
     82 static	int rmtstate = TS_CLOSED;
     83 static	int rmtape;
     84 static	char *rmtpeer;
     85 
     86 static	int	okname(char *);
     87 static	int	rmtcall(char *, char *, int);
     88 static	void	rmtconnaborted(int);
     89 static	int	rmtgetb(void);
     90 static	void	rmtgetconn(void);
     91 static	void	rmtgets(char *, int);
     92 	int	rmtread(char *, int);
     93 static	int	rmtreply(char *, int);
     94 	int	rmtseek(int, int);
     95 
     96 extern	int ntrec;		/* blocking factor on tape */
     97 
     98 int
     99 rmthost(char *host)
    100 {
    101 
    102 	if ((rmtpeer = strdup(host)) == NULL)
    103 		err(1, "strdup");
    104 	signal(SIGPIPE, rmtconnaborted);
    105 	rmtgetconn();
    106 	if (rmtape < 0)
    107 		return (0);
    108 	return (1);
    109 }
    110 
    111 static void
    112 rmtconnaborted(int dummy)
    113 {
    114 
    115 	errx(1, "Lost connection to remote host.");
    116 }
    117 
    118 void
    119 rmtgetconn(void)
    120 {
    121 	char *cp;
    122 	static struct servent *sp = NULL;
    123 	static struct passwd *pwd = NULL;
    124 	char *tuser, *name;
    125 	int size, opt;
    126 
    127 	if (sp == NULL) {
    128 		sp = getservbyname("shell", "tcp");
    129 		if (sp == NULL)
    130 			errx(1, "shell/tcp: unknown service");
    131 		pwd = getpwuid(getuid());
    132 		if (pwd == NULL)
    133 			errx(1, "who are you?");
    134 	}
    135 	if ((name = strdup(pwd->pw_name)) == NULL)
    136 		err(1, "strdup");
    137 	if ((cp = strchr(rmtpeer, '@')) != NULL) {
    138 		tuser = rmtpeer;
    139 		*cp = '\0';
    140 		if (!okname(tuser))
    141 			exit(1);
    142 		rmtpeer = ++cp;
    143 	} else
    144 		tuser = name;
    145 
    146 	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT,
    147 	    (int *)0);
    148 	(void)free(name);
    149 	if (rmtape < 0)
    150 		return;
    151 
    152 	size = ntrec * TP_BSIZE;
    153 	if (size > 60 * 1024)		/* XXX */
    154 		size = 60 * 1024;
    155 	/* Leave some space for rmt request/response protocol */
    156 	size += 2 * 1024;
    157 	while (size > TP_BSIZE &&
    158 	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
    159 		    size -= TP_BSIZE;
    160 	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
    161 
    162 	opt = IPTOS_THROUGHPUT;
    163 	(void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt));
    164 
    165 	opt = 1;
    166 	(void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt));
    167 }
    168 
    169 static int
    170 okname(char *cp0)
    171 {
    172 	char *cp;
    173 	int c;
    174 
    175 	for (cp = cp0; *cp; cp++) {
    176 		c = *cp;
    177 		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
    178 			warnx("invalid user name: %s", cp0);
    179 			return (0);
    180 		}
    181 	}
    182 	return (1);
    183 }
    184 
    185 int
    186 rmtopen(char *tapedevice, int mode, int verbose)
    187 {
    188 	char buf[256];
    189 
    190 	(void)snprintf(buf, sizeof buf, "O%s\n%d\n", tapedevice, mode);
    191 	rmtstate = TS_OPEN;
    192 	return (rmtcall(tapedevice, buf, verbose));
    193 }
    194 
    195 void
    196 rmtclose(void)
    197 {
    198 
    199 	if (rmtstate != TS_OPEN)
    200 		return;
    201 	rmtcall("close", "C\n", 1);
    202 	rmtstate = TS_CLOSED;
    203 }
    204 
    205 int
    206 rmtread(char *buf, int count)
    207 {
    208 	char line[30];
    209 	int n, i, cc;
    210 
    211 	(void)snprintf(line, sizeof line, "R%d\n", count);
    212 	n = rmtcall("read", line, 1);
    213 	if (n < 0) {
    214 		errno = n;
    215 		return (-1);
    216 	}
    217 	for (i = 0; i < n; i += cc) {
    218 		cc = read(rmtape, buf+i, n - i);
    219 		if (cc <= 0) {
    220 			rmtconnaborted(0);
    221 		}
    222 	}
    223 	return (n);
    224 }
    225 
    226 int
    227 rmtwrite(char *buf, int count)
    228 {
    229 	char line[30];
    230 
    231 	(void)snprintf(line, sizeof line, "W%d\n", count);
    232 	write(rmtape, line, strlen(line));
    233 	write(rmtape, buf, count);
    234 	return (rmtreply("write", 1));
    235 }
    236 
    237 #if 0		/* XXX unused? */
    238 void
    239 rmtwrite0(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 }
    246 
    247 void
    248 rmtwrite1(char *buf, int count)
    249 {
    250 
    251 	write(rmtape, buf, count);
    252 }
    253 
    254 int
    255 rmtwrite2(void)
    256 {
    257 
    258 	return (rmtreply("write", 1));
    259 }
    260 #endif
    261 
    262 int
    263 rmtseek(int offset, int pos)
    264 {
    265 	char line[80];
    266 
    267 	(void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos);
    268 	return (rmtcall("seek", line, 1));
    269 }
    270 
    271 
    272 #if 0		/* XXX unused? */
    273 struct mtget *
    274 rmtstatus(void)
    275 {
    276 	struct	mtget mts;
    277 	int i;
    278 	char *cp;
    279 
    280 	if (rmtstate != TS_OPEN)
    281 		return (NULL);
    282 	rmtcall("status", "S\n", 1);
    283 	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
    284 		*cp++ = rmtgetb();
    285 	return (&mts);
    286 }
    287 #endif
    288 
    289 int
    290 rmtioctl(int cmd, int count)
    291 {
    292 	char buf[256];
    293 
    294 	if (count < 0)
    295 		return (-1);
    296 	(void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count);
    297 	return (rmtcall("ioctl", buf, 1));
    298 }
    299 
    300 static int
    301 rmtcall(char *cmd, char *buf, int verbose)
    302 {
    303 
    304 	if (write(rmtape, buf, strlen(buf)) != strlen(buf))
    305 		rmtconnaborted(0);
    306 	return (rmtreply(cmd, verbose));
    307 }
    308 
    309 static int
    310 rmtreply(char *cmd, int verbose)
    311 {
    312 	char *cp;
    313 	char code[30], emsg[BUFSIZ];
    314 
    315 	rmtgets(code, sizeof (code));
    316 	if (*code == 'E' || *code == 'F') {
    317 		rmtgets(emsg, sizeof (emsg));
    318 		if (verbose)
    319 			msg("%s: %s", cmd, emsg);
    320 		if (*code == 'F') {
    321 			rmtstate = TS_CLOSED;
    322 			return (-1);
    323 		}
    324 		return (-1);
    325 	}
    326 	if (*code != 'A') {
    327 		/* Kill trailing newline */
    328 		cp = code + strlen(code);
    329 		if (cp > code && *--cp == '\n')
    330 			*cp = '\0';
    331 
    332 		msg("Protocol to remote tape server botched (code \"%s\").\n",
    333 		    code);
    334 		rmtconnaborted(0);
    335 	}
    336 	return (atoi(code + 1));
    337 }
    338 
    339 int
    340 rmtgetb(void)
    341 {
    342 	char c;
    343 
    344 	if (read(rmtape, &c, 1) != 1)
    345 		rmtconnaborted(0);
    346 	return (c);
    347 }
    348 
    349 /* Get a line (guaranteed to have a trailing newline). */
    350 void
    351 rmtgets(char *line, int len)
    352 {
    353 	char *cp = line;
    354 
    355 	while (len > 1) {
    356 		*cp = rmtgetb();
    357 		if (*cp == '\n') {
    358 			cp[1] = '\0';
    359 			return;
    360 		}
    361 		cp++;
    362 		len--;
    363 	}
    364 	*cp = '\0';
    365 	msg("Protocol to remote tape server botched.\n");
    366 	msg("(rmtgets got \"%s\").\n", line);
    367 	rmtconnaborted(0);
    368 }
    369