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dumprmt.c revision 1.35 
      1 /*	$NetBSD: dumprmt.c,v 1.35 2013/01/13 22:53:01 dholland 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)dumprmt.c	8.3 (Berkeley) 4/28/95";
     36 #else
     37 __RCSID("$NetBSD: dumprmt.c,v 1.35 2013/01/13 22:53:01 dholland Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include <sys/param.h>
     42 #include <sys/mtio.h>
     43 #include <sys/ioctl.h>
     44 #include <sys/socket.h>
     45 #include <sys/time.h>
     46 #include <ufs/ufs/dinode.h>
     47 
     48 #include <netinet/in.h>
     49 #include <netinet/in_systm.h>
     50 #include <netinet/ip.h>
     51 #include <netinet/tcp.h>
     52 
     53 #include <protocols/dumprestore.h>
     54 
     55 #include <ctype.h>
     56 #include <err.h>
     57 #include <errno.h>
     58 #include <netdb.h>
     59 #include <pwd.h>
     60 #include <signal.h>
     61 #include <stdio.h>
     62 #include <stdlib.h>
     63 #include <string.h>
     64 #include <unistd.h>
     65 
     66 #include "pathnames.h"
     67 #include "dump.h"
     68 
     69 #define	TS_CLOSED	0
     70 #define	TS_OPEN		1
     71 
     72 static	int rmtstate = TS_CLOSED;
     73 static	int rmtape;
     74 static	char *rmtpeer;
     75 
     76 static	int	okname(const char *);
     77 static	int	rmtcall(const char *, const char *, int);
     78 __dead static	void	rmtconnaborted(int);
     79 static	int	rmtgetb(void);
     80 static	void	rmtgetconn(void);
     81 static	void	rmtgets(char *, int);
     82 	int	rmtread(char *, int);
     83 static	int	rmtreply(const char *, int);
     84 	int	rmtseek(int, int);
     85 
     86 extern	int ntrec;		/* blocking factor on tape */
     87 
     88 int
     89 rmthost(const char *host)
     90 {
     91 
     92 	if ((rmtpeer = strdup(host)) == NULL)
     93 		err(X_STARTUP, "strdup");
     94 	signal(SIGPIPE, rmtconnaborted);
     95 	rmtgetconn();
     96 	if (rmtape < 0)
     97 		return (0);
     98 	return (1);
     99 }
    100 
    101 static void
    102 rmtconnaborted(int dummy __unused)
    103 {
    104 
    105 	errx(X_ABORT, "Lost connection to remote host.");
    106 }
    107 
    108 void
    109 rmtgetconn(void)
    110 {
    111 	char *cp;
    112 	static struct servent *sp = NULL;
    113 	static struct passwd *pwd = NULL;
    114 	char *tuser, *name;
    115 	int size, opt;
    116 
    117 	if (sp == NULL) {
    118 		sp = getservbyname("shell", "tcp");
    119 		if (sp == NULL)
    120 			errx(X_STARTUP, "shell/tcp: unknown service");
    121 		pwd = getpwuid(getuid());
    122 		if (pwd == NULL)
    123 			errx(X_STARTUP, "who are you?");
    124 	}
    125 	if ((name = strdup(pwd->pw_name)) == NULL)
    126 		err(X_STARTUP, "strdup");
    127 	if ((cp = strchr(rmtpeer, '@')) != NULL) {
    128 		tuser = rmtpeer;
    129 		*cp = '\0';
    130 		if (!okname(tuser))
    131 			exit(X_STARTUP);
    132 		rmtpeer = ++cp;
    133 	} else
    134 		tuser = name;
    135 
    136 	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT,
    137 	    (int *)0);
    138 	(void)free(name);
    139 	if (rmtape < 0)
    140 		return;
    141 
    142 	size = ntrec * TP_BSIZE;
    143 	if (size > 60 * 1024)		/* XXX */
    144 		size = 60 * 1024;
    145 	/* Leave some space for rmt request/response protocol */
    146 	size += 2 * 1024;
    147 	while (size > TP_BSIZE &&
    148 	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
    149 		    size -= TP_BSIZE;
    150 	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
    151 
    152 	opt = IPTOS_THROUGHPUT;
    153 	(void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt));
    154 
    155 	opt = 1;
    156 	(void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt));
    157 }
    158 
    159 static int
    160 okname(const char *cp0)
    161 {
    162 	const char *cp;
    163 	int c;
    164 
    165 	for (cp = cp0; *cp; cp++) {
    166 		c = *cp;
    167 		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
    168 			warnx("invalid user name: %s", cp0);
    169 			return (0);
    170 		}
    171 	}
    172 	return (1);
    173 }
    174 
    175 int
    176 rmtopen(const char *tapedevice, int mode, int verbose)
    177 {
    178 	char buf[256];
    179 
    180 	(void)snprintf(buf, sizeof buf, "O%s\n%d\n", tapedevice, mode);
    181 	rmtstate = TS_OPEN;
    182 	return (rmtcall(tapedevice, buf, verbose));
    183 }
    184 
    185 void
    186 rmtclose(void)
    187 {
    188 
    189 	if (rmtstate != TS_OPEN)
    190 		return;
    191 	rmtcall("close", "C\n", 1);
    192 	rmtstate = TS_CLOSED;
    193 }
    194 
    195 int
    196 rmtread(char *buf, int count)
    197 {
    198 	char line[30];
    199 	int n, i, cc;
    200 
    201 	(void)snprintf(line, sizeof line, "R%d\n", count);
    202 	n = rmtcall("read", line, 1);
    203 	if (n < 0) {
    204 		/* rmtcall() properly sets errno for us on errors. */
    205 		return (n);
    206 	}
    207 	for (i = 0; i < n; i += cc) {
    208 		cc = read(rmtape, buf+i, n - i);
    209 		if (cc <= 0) {
    210 			rmtconnaborted(0);
    211 		}
    212 	}
    213 	return (n);
    214 }
    215 
    216 int
    217 rmtwrite(const char *buf, int count)
    218 {
    219 	char line[30];
    220 
    221 	(void)snprintf(line, sizeof line, "W%d\n", count);
    222 	write(rmtape, line, strlen(line));
    223 	write(rmtape, buf, count);
    224 	return (rmtreply("write", 1));
    225 }
    226 
    227 #if 0		/* XXX unused? */
    228 void
    229 rmtwrite0(int count)
    230 {
    231 	char line[30];
    232 
    233 	(void)snprintf(line, sizeof line, "W%d\n", count);
    234 	write(rmtape, line, strlen(line));
    235 }
    236 
    237 void
    238 rmtwrite1(char *buf, int count)
    239 {
    240 
    241 	write(rmtape, buf, count);
    242 }
    243 
    244 int
    245 rmtwrite2(void)
    246 {
    247 
    248 	return (rmtreply("write", 1));
    249 }
    250 #endif
    251 
    252 int
    253 rmtseek(int offset, int pos)
    254 {
    255 	char line[80];
    256 
    257 	(void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos);
    258 	return (rmtcall("seek", line, 1));
    259 }
    260 
    261 
    262 #if 0		/* XXX unused? */
    263 struct mtget *
    264 rmtstatus(void)
    265 {
    266 	struct	mtget mts;
    267 	int i;
    268 	char *cp;
    269 
    270 	if (rmtstate != TS_OPEN)
    271 		return (NULL);
    272 	rmtcall("status", "S\n", 1);
    273 	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
    274 		*cp++ = rmtgetb();
    275 	return (&mts);
    276 }
    277 #endif
    278 
    279 int
    280 rmtioctl(int cmd, int count)
    281 {
    282 	char buf[256];
    283 
    284 	if (count < 0)
    285 		return (-1);
    286 	(void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count);
    287 	return (rmtcall("ioctl", buf, 1));
    288 }
    289 
    290 static int
    291 rmtcall(const char *cmd, const char *buf, int verbose)
    292 {
    293 
    294 	if ((size_t)write(rmtape, buf, strlen(buf)) != strlen(buf))
    295 		rmtconnaborted(0);
    296 	return (rmtreply(cmd, verbose));
    297 }
    298 
    299 static int
    300 rmtreply(const char *cmd, int verbose)
    301 {
    302 	char *cp;
    303 	char code[30], emsg[BUFSIZ];
    304 
    305 	rmtgets(code, sizeof (code));
    306 	if (*code == 'E' || *code == 'F') {
    307 		rmtgets(emsg, sizeof (emsg));
    308 		if (verbose)
    309 			msg("%s: %s", cmd, emsg);
    310 		errno = atoi(code + 1);
    311 		if (*code == 'F')
    312 			rmtstate = TS_CLOSED;
    313 		return (-1);
    314 	}
    315 	if (*code != 'A') {
    316 		/* Kill trailing newline */
    317 		cp = code + strlen(code);
    318 		if (cp > code && *--cp == '\n')
    319 			*cp = '\0';
    320 
    321 		msg("Protocol to remote tape server botched (code \"%s\").\n",
    322 		    code);
    323 		rmtconnaborted(0);
    324 	}
    325 	return (atoi(code + 1));
    326 }
    327 
    328 int
    329 rmtgetb(void)
    330 {
    331 	char c;
    332 
    333 	if (read(rmtape, &c, 1) != 1)
    334 		rmtconnaborted(0);
    335 	return (c);
    336 }
    337 
    338 /* Get a line (guaranteed to have a trailing newline). */
    339 void
    340 rmtgets(char *line, int len)
    341 {
    342 	char *cp = line;
    343 
    344 	while (len > 1) {
    345 		*cp = rmtgetb();
    346 		if (*cp == '\n') {
    347 			cp[1] = '\0';
    348 			return;
    349 		}
    350 		cp++;
    351 		len--;
    352 	}
    353 	*cp = '\0';
    354 	msg("Protocol to remote tape server botched.\n");
    355 	msg("(rmtgets got \"%s\").\n", line);
    356 	rmtconnaborted(0);
    357 }
    358