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      1 /*	$NetBSD: dumprmt.c,v 1.37 2013/06/15 01:27:19 christos 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 1.37 2013/06/15 01:27:19 christos 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 
     47 #include <netinet/in.h>
     48 #include <netinet/in_systm.h>
     49 #include <netinet/ip.h>
     50 #include <netinet/tcp.h>
     51 
     52 #include <ctype.h>
     53 #include <err.h>
     54 #include <errno.h>
     55 #include <netdb.h>
     56 #include <pwd.h>
     57 #include <signal.h>
     58 #include <stdio.h>
     59 #include <stdlib.h>
     60 #include <string.h>
     61 #include <unistd.h>
     62 
     63 #include "pathnames.h"
     64 #include "dump.h"
     65 
     66 #define	TS_CLOSED	0
     67 #define	TS_OPEN		1
     68 
     69 static	int rmtstate = TS_CLOSED;
     70 static	int rmtape;
     71 static	char *rmtpeer;
     72 
     73 static	int	okname(const char *);
     74 static	int	rmtcall(const char *, const char *, int);
     75 __dead static	void	rmtconnaborted(int);
     76 static	int	rmtgetb(void);
     77 static	void	rmtgetconn(void);
     78 static	void	rmtgets(char *, int);
     79 	int	rmtread(char *, int);
     80 static	int	rmtreply(const char *, int);
     81 	int	rmtseek(int, int);
     82 
     83 extern	int ntrec;		/* blocking factor on tape */
     84 
     85 int
     86 rmthost(const char *host)
     87 {
     88 
     89 	if ((rmtpeer = strdup(host)) == NULL)
     90 		err(X_STARTUP, "strdup");
     91 	signal(SIGPIPE, rmtconnaborted);
     92 	rmtgetconn();
     93 	if (rmtape < 0)
     94 		return (0);
     95 	return (1);
     96 }
     97 
     98 static void
     99 rmtconnaborted(int dummy __unused)
    100 {
    101 
    102 	errx(X_ABORT, "Lost connection to remote host.");
    103 }
    104 
    105 void
    106 rmtgetconn(void)
    107 {
    108 	char *cp;
    109 	static struct servent *sp = NULL;
    110 	static struct passwd *pwd = NULL;
    111 	char *tuser, *name;
    112 	int size, opt;
    113 
    114 	if (sp == NULL) {
    115 		sp = getservbyname("shell", "tcp");
    116 		if (sp == NULL)
    117 			errx(X_STARTUP, "shell/tcp: unknown service");
    118 		pwd = getpwuid(getuid());
    119 		if (pwd == NULL)
    120 			errx(X_STARTUP, "who are you?");
    121 	}
    122 	if ((name = strdup(pwd->pw_name)) == NULL)
    123 		err(X_STARTUP, "strdup");
    124 	if ((cp = strchr(rmtpeer, '@')) != NULL) {
    125 		tuser = rmtpeer;
    126 		*cp = '\0';
    127 		if (!okname(tuser))
    128 			exit(X_STARTUP);
    129 		rmtpeer = ++cp;
    130 	} else
    131 		tuser = name;
    132 
    133 	rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT,
    134 	    (int *)0);
    135 	(void)free(name);
    136 	if (rmtape < 0)
    137 		return;
    138 
    139 	size = ntrec * TP_BSIZE;
    140 	if (size > 60 * 1024)		/* XXX */
    141 		size = 60 * 1024;
    142 	/* Leave some space for rmt request/response protocol */
    143 	size += 2 * 1024;
    144 	while (size > TP_BSIZE &&
    145 	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
    146 		    size -= TP_BSIZE;
    147 	(void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
    148 
    149 	opt = IPTOS_THROUGHPUT;
    150 	(void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt));
    151 
    152 	opt = 1;
    153 	(void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt));
    154 }
    155 
    156 static int
    157 okname(const char *cp0)
    158 {
    159 	const char *cp;
    160 	unsigned char c;
    161 
    162 	for (cp = cp0; *cp; cp++) {
    163 		c = *cp;
    164 		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
    165 			warnx("invalid user name: %s", cp0);
    166 			return (0);
    167 		}
    168 	}
    169 	return (1);
    170 }
    171 
    172 int
    173 rmtopen(const char *tapedevice, int mode, int verbose)
    174 {
    175 	char buf[256];
    176 
    177 	(void)snprintf(buf, sizeof buf, "O%s\n%d\n", tapedevice, mode);
    178 	rmtstate = TS_OPEN;
    179 	return (rmtcall(tapedevice, buf, verbose));
    180 }
    181 
    182 void
    183 rmtclose(void)
    184 {
    185 
    186 	if (rmtstate != TS_OPEN)
    187 		return;
    188 	rmtcall("close", "C\n", 1);
    189 	rmtstate = TS_CLOSED;
    190 }
    191 
    192 int
    193 rmtread(char *buf, int count)
    194 {
    195 	char line[30];
    196 	int n, i, cc;
    197 
    198 	(void)snprintf(line, sizeof line, "R%d\n", count);
    199 	n = rmtcall("read", line, 1);
    200 	if (n < 0) {
    201 		/* rmtcall() properly sets errno for us on errors. */
    202 		return (n);
    203 	}
    204 	for (i = 0; i < n; i += cc) {
    205 		cc = read(rmtape, buf+i, n - i);
    206 		if (cc <= 0) {
    207 			rmtconnaborted(0);
    208 		}
    209 	}
    210 	return (n);
    211 }
    212 
    213 int
    214 rmtwrite(const char *buf, int count)
    215 {
    216 	char line[30];
    217 
    218 	(void)snprintf(line, sizeof line, "W%d\n", count);
    219 	write(rmtape, line, strlen(line));
    220 	write(rmtape, buf, count);
    221 	return (rmtreply("write", 1));
    222 }
    223 
    224 #if 0		/* XXX unused? */
    225 void
    226 rmtwrite0(int count)
    227 {
    228 	char line[30];
    229 
    230 	(void)snprintf(line, sizeof line, "W%d\n", count);
    231 	write(rmtape, line, strlen(line));
    232 }
    233 
    234 void
    235 rmtwrite1(char *buf, int count)
    236 {
    237 
    238 	write(rmtape, buf, count);
    239 }
    240 
    241 int
    242 rmtwrite2(void)
    243 {
    244 
    245 	return (rmtreply("write", 1));
    246 }
    247 #endif
    248 
    249 int
    250 rmtseek(int offset, int pos)
    251 {
    252 	char line[80];
    253 
    254 	(void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos);
    255 	return (rmtcall("seek", line, 1));
    256 }
    257 
    258 
    259 #if 0		/* XXX unused? */
    260 struct mtget *
    261 rmtstatus(void)
    262 {
    263 	struct	mtget mts;
    264 	int i;
    265 	char *cp;
    266 
    267 	if (rmtstate != TS_OPEN)
    268 		return (NULL);
    269 	rmtcall("status", "S\n", 1);
    270 	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
    271 		*cp++ = rmtgetb();
    272 	return (&mts);
    273 }
    274 #endif
    275 
    276 int
    277 rmtioctl(int cmd, int count)
    278 {
    279 	char buf[256];
    280 
    281 	if (count < 0)
    282 		return (-1);
    283 	(void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count);
    284 	return (rmtcall("ioctl", buf, 1));
    285 }
    286 
    287 static int
    288 rmtcall(const char *cmd, const char *buf, int verbose)
    289 {
    290 
    291 	if ((size_t)write(rmtape, buf, strlen(buf)) != strlen(buf))
    292 		rmtconnaborted(0);
    293 	return (rmtreply(cmd, verbose));
    294 }
    295 
    296 static int
    297 rmtreply(const char *cmd, int verbose)
    298 {
    299 	char *cp;
    300 	char code[30], emsg[BUFSIZ];
    301 
    302 	rmtgets(code, sizeof (code));
    303 	if (*code == 'E' || *code == 'F') {
    304 		rmtgets(emsg, sizeof (emsg));
    305 		if (verbose)
    306 			msg("%s: %s", cmd, emsg);
    307 		errno = atoi(code + 1);
    308 		if (*code == 'F')
    309 			rmtstate = TS_CLOSED;
    310 		return (-1);
    311 	}
    312 	if (*code != 'A') {
    313 		/* Kill trailing newline */
    314 		cp = code + strlen(code);
    315 		if (cp > code && *--cp == '\n')
    316 			*cp = '\0';
    317 
    318 		msg("Protocol to remote tape server botched (code \"%s\").\n",
    319 		    code);
    320 		rmtconnaborted(0);
    321 	}
    322 	return (atoi(code + 1));
    323 }
    324 
    325 int
    326 rmtgetb(void)
    327 {
    328 	char c;
    329 
    330 	if (read(rmtape, &c, 1) != 1)
    331 		rmtconnaborted(0);
    332 	return (c);
    333 }
    334 
    335 /* Get a line (guaranteed to have a trailing newline). */
    336 void
    337 rmtgets(char *line, int len)
    338 {
    339 	char *cp = line;
    340 
    341 	while (len > 1) {
    342 		*cp = rmtgetb();
    343 		if (*cp == '\n') {
    344 			cp[1] = '\0';
    345 			return;
    346 		}
    347 		cp++;
    348 		len--;
    349 	}
    350 	*cp = '\0';
    351 	msg("Protocol to remote tape server botched.\n");
    352 	msg("(rmtgets got \"%s\").\n", line);
    353 	rmtconnaborted(0);
    354 }
    355