[dump.git] / common / dumprmt.c

/*
 *	Ported to Linux's Second Extended File System as part of the
 *	dump and restore backup suit
 *	Remy Card <card@Linux.EU.Org>, 1994-1997
 *	Stelian Pop <pop@cybercable.fr>, 1999
 */

/*-
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] =
	"$Id: dumprmt.c,v 1.7 1999/10/30 22:55:50 tiniou Exp $";
#endif /* not lint */

#ifdef __linux__
#include <sys/types.h>
#include <linux/types.h>
#endif
#include <sys/param.h>
#include <sys/mtio.h>
#include <sys/socket.h>
#include <sys/time.h>
#ifdef __linux__
#include <linux/ext2_fs.h>
#include <bsdcompat.h>
#include <signal.h>
#else
#ifdef sunos
#include <sys/vnode.h>

#include <ufs/inode.h>
#else
#include <ufs/ufs/dinode.h>
#endif
#endif

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>

#include <protocols/dumprestore.h>

#include <ctype.h>
#include <errno.h>
#include <compaterr.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#ifdef __STDC__
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#endif

#ifdef	__linux__
#include <ext2fs/ext2fs.h>
#endif

#include "pathnames.h"
#include "dump.h"

#define	TS_CLOSED	0
#define	TS_OPEN		1

static	int rmtstate = TS_CLOSED;
static	int tormtape = -1;
static	int fromrmtape = -1;
static	const char *rmtpeer = 0;

static	int okname __P((const char *));
static	int rmtcall __P((const char *, const char *));
static	void rmtconnaborted __P((int));
static	int rmtgetb __P((void));
static	int rmtgetconn __P((void));
static	void rmtgets __P((char *, size_t));
static	int rmtreply __P((const char *));
static  int piped_child __P((const char **command));
#ifdef KERBEROS
int	krcmd __P((char **, int /*u_short*/, char *, char *, int *, char *));
#endif

static	int errfd = -1;
extern	int dokerberos;
extern	int ntrec;		/* blocking factor on tape */
#ifndef errno
extern	int errno;
#endif

int
rmthost(const char *host)
{
	if (rmtpeer)
		free((void *)rmtpeer);
	if ((rmtpeer = strdup(host)) == NULL)
		rmtpeer = host;
	signal(SIGPIPE, rmtconnaborted);
	return rmtgetconn();
}

static void
rmtconnaborted(int signo)
{
	msg("Lost connection to remote host.\n");
	if (errfd != -1) {
		fd_set r;
		struct timeval t;

		FD_ZERO(&r);
		FD_SET(errfd, &r);
		t.tv_sec = 0;
		t.tv_usec = 0;
		if (select(errfd + 1, &r, NULL, NULL, &t)) {
			int i;
			char buf[2048];

			if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
				buf[i] = '\0';
				msg("on %s: %s%s", rmtpeer, buf,
					buf[i - 1] == '\n' ? "" : "\n");
			}
		}
	}

	exit(X_ABORT);
}

static int
rmtgetconn(void)
{
	register char *cp;
	register const char *rmt;
	static struct servent *sp = NULL;
	static struct passwd *pwd = NULL;
	const char *tuser;
	const char *rsh;
	int size;
	int throughput;
	int on;

	rsh = getenv("RSH");

	if (!rsh && sp == NULL) {
		sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
		if (sp == NULL)
			errx(1, "%s/tcp: unknown service",
			    dokerberos ? "kshell" : "shell");
	}
	if (pwd == NULL) {
		pwd = getpwuid(getuid());
		if (pwd == NULL)
			errx(1, "who are you?");
	}
	if ((cp = strchr(rmtpeer, '@')) != NULL) {
		tuser = rmtpeer;
		*cp = '\0';
		if (!okname(tuser))
			exit(X_STARTUP);
		rmtpeer = ++cp;
	} else
		tuser = pwd->pw_name;
	if ((rmt = getenv("RMT")) == NULL)
		rmt = _PATH_RMT;
	msg("");

	if (rsh) {
		const char *rshcmd[6];
		rshcmd[0] = rsh;
		rshcmd[1] = rmtpeer;
		rshcmd[2] = "-l";
		rshcmd[3] = tuser;
		rshcmd[4] = rmt;
		rshcmd[5] = NULL;

		if (piped_child(rshcmd) < 0) {
			msg("cannot open connection\n");
			return 0;
		}
	}
	else {
#ifdef KERBEROS
		if (dokerberos)
			tormtape = krcmd((char **)&rmtpeer, sp->s_port, tuser, rmt, &errfd,
				       (char *)0);
		else
#endif
			tormtape = rcmd((char **)&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
				      tuser, rmt, &errfd);
		if (tormtape < 0) {
			msg("login to %s as %s failed.\n", rmtpeer, tuser);
			return 0;
		}
		size = ntrec * TP_BSIZE;
		if (size > 60 * 1024)		/* XXX */
			size = 60 * 1024;
		/* Leave some space for rmt request/response protocol */
		size += 2 * 1024;
		while (size > TP_BSIZE &&
		    setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
			    size -= TP_BSIZE;
		(void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
		throughput = IPTOS_THROUGHPUT;
		if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
		    &throughput, sizeof(throughput)) < 0)
			perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
		on = 1;
		if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
			perror("TCP_NODELAY setsockopt");
		fromrmtape = tormtape;
	}
	(void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
	return 1;
}

static int
okname(const char *cp0)
{
	register const char *cp;
	register int c;

	for (cp = cp0; *cp; cp++) {
		c = *cp;
		if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
			warnx("invalid user name %s\n", cp0);
			return (0);
		}
	}
	return (1);
}

int
rmtopen(const char *tape, int mode)
{
	char buf[MAXPATHLEN];

	(void)snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
	rmtstate = TS_OPEN;
	return (rmtcall(tape, buf));
}

void
rmtclose(void)
{

	if (rmtstate != TS_OPEN)
		return;
	rmtcall("close", "C\n");
	rmtstate = TS_CLOSED;
}

int
rmtread(char *buf, size_t count)
{
	char line[30];
	int n, i;
	ssize_t cc;

	(void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
	n = rmtcall("read", line);
	if (n < 0)
		/* rmtcall() properly sets errno for us on errors. */
		return (n);
	for (i = 0; i < n; i += cc) {
		cc = read(fromrmtape, buf+i, n - i);
		if (cc <= 0)
			rmtconnaborted(0);
	}
	return (n);
}

int
rmtwrite(const char *buf, size_t count)
{
	char line[30];

	(void)snprintf(line, sizeof (line), "W%d\n", count);
	write(tormtape, line, strlen(line));
	write(tormtape, buf, count);
	return (rmtreply("write"));
}

int
rmtseek(int offset, int pos)
{
	char line[80];

	(void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
	return (rmtcall("seek", line));
}

struct	mtget mts;

struct mtget *
rmtstatus(void)
{
	register int i;
	register char *cp;

	if (rmtstate != TS_OPEN)
		return (NULL);
	rmtcall("status", "S\n");
	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
		*cp++ = rmtgetb();
	return (&mts);
}

int
rmtioctl(int cmd, int count)
{
	char buf[256];

	if (count < 0)
		return (-1);
	(void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
	return (rmtcall("ioctl", buf));
}

static int
rmtcall(const char *cmd, const char *buf)
{

	if (write(tormtape, buf, strlen(buf)) != strlen(buf))
		rmtconnaborted(0);
	return (rmtreply(cmd));
}

static int
rmtreply(const char *cmd)
{
	register char *cp;
	char code[30], emsg[BUFSIZ];

	rmtgets(code, sizeof (code));
	if (*code == 'E' || *code == 'F') {
		rmtgets(emsg, sizeof (emsg));
		msg("%s: %s", cmd, emsg);
		errno = atoi(code + 1);
		if (*code == 'F')
			rmtstate = TS_CLOSED;
		return (-1);
	}
	if (*code != 'A') {
		/* Kill trailing newline */
		cp = code + strlen(code);
		if (cp > code && *--cp == '\n')
			*cp = '\0';

		msg("Protocol to remote tape server botched (code \"%s\").\n",
		    code);
		rmtconnaborted(0);
	}
	return (atoi(code + 1));
}

static int
rmtgetb(void)
{
	char c;

	if (read(fromrmtape, &c, 1) != 1)
		rmtconnaborted(0);
	return (c);
}

/* Get a line (guaranteed to have a trailing newline). */
static void
rmtgets(char *line, size_t len)
{
	register char *cp = line;

	while (len > 1) {
		*cp = rmtgetb();
		if (*cp == '\n') {
			cp[1] = '\0';
			return;
		}
		cp++;
		len--;
	}
	*cp = '\0';
	msg("Protocol to remote tape server botched.\n");
	msg("(rmtgets got \"%s\").\n", line);
	rmtconnaborted(0);
}

int piped_child(const char **command) {
	int pid;
	int to_child_pipe[2];
	int from_child_pipe[2];

	if (pipe (to_child_pipe) < 0) {
		msg ("cannot create pipe: %s\n", strerror(errno));
		return -1;
	}
	if (pipe (from_child_pipe) < 0) {
		msg ("cannot create pipe: %s\n", strerror(errno)); 
		return -1;
	}
	pid = fork ();
	if (pid < 0) {
		msg ("cannot fork: %s\n", strerror(errno));
		return -1;
	}
	if (pid == 0) {
		if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
			msg ("cannot dup2 pipe: %s\n", strerror(errno));
			exit(1);
		}
		if (close (to_child_pipe[1]) < 0) {
			msg ("cannot close pipe: %s\n", strerror(errno));
			exit(1);
		}
		if (close (from_child_pipe[0]) < 0) {
			msg ("cannot close pipe: %s\n", strerror(errno));
			exit(1);
		}
		if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
			msg ("cannot dup2 pipe: %s\n", strerror(errno));
			exit(1);
		}
		execvp (command[0], (char *const *) command);
		msg("cannot exec %s: %s\n", command[0], strerror(errno));
		exit(1);
	}
	if (close (to_child_pipe[0]) < 0) {
		msg ("cannot close pipe: %s\n", strerror(errno));
		return -1;
	}
	if (close (from_child_pipe[1]) < 0) {
		msg ("cannot close pipe: %s\n", strerror(errno));
		return -1;
	}
	tormtape = to_child_pipe[1];
	fromrmtape = from_child_pipe[0];
	return pid;
}
Commit	Line	Data
1227625a SP	1	/*
	2	* Ported to Linux's Second Extended File System as part of the
	3	* dump and restore backup suit
b45f51d6	4	* Remy Card <card@Linux.EU.Org>, 1994-1997
df9ae507	5	* Stelian Pop <pop@cybercable.fr>, 1999
1227625a SP	6	*/
	7
	8	/*-
	9	* Copyright (c) 1980, 1993
	10	* The Regents of the University of California. All rights reserved.
	11	*
	12	* Redistribution and use in source and binary forms, with or without
	13	* modification, are permitted provided that the following conditions
	14	* are met:
	15	* 1. Redistributions of source code must retain the above copyright
	16	* notice, this list of conditions and the following disclaimer.
	17	* 2. Redistributions in binary form must reproduce the above copyright
	18	* notice, this list of conditions and the following disclaimer in the
	19	* documentation and/or other materials provided with the distribution.
	20	* 3. All advertising materials mentioning features or use of this software
	21	* must display the following acknowledgement:
	22	* This product includes software developed by the University of
	23	* California, Berkeley and its contributors.
	24	* 4. Neither the name of the University nor the names of its contributors
	25	* may be used to endorse or promote products derived from this software
	26	* without specific prior written permission.
	27	*
	28	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	29	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	30	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	31	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	32	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	33	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	34	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	35	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	36	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	37	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	38	* SUCH DAMAGE.
	39	*/
	40
	41	#ifndef lint
b45f51d6	42	static const char rcsid[] =
0c62667d	43	"$Id: dumprmt.c,v 1.7 1999/10/30 22:55:50 tiniou Exp $";
1227625a SP	44	#endif /* not lint */
1227625a SP	45
b45f51d6 SP	46	#ifdef __linux__
	47	#include <sys/types.h>
	48	#include <linux/types.h>
	49	#endif
1227625a SP	50	#include <sys/param.h>
1227625a SP	51	#include <sys/mtio.h>
1227625a SP	52	#include <sys/socket.h>
	53	#include <sys/time.h>
	54	#ifdef __linux__
	55	#include <linux/ext2_fs.h>
	56	#include <bsdcompat.h>
b45f51d6	57	#include <signal.h>
1227625a SP	58	#else
	59	#ifdef sunos
	60	#include <sys/vnode.h>
	61
	62	#include <ufs/inode.h>
	63	#else
	64	#include <ufs/ufs/dinode.h>
	65	#endif
	66	#endif
	67
	68	#include <netinet/in.h>
b45f51d6 SP	69	#include <netinet/in_systm.h>
b45f51d6 SP	70	#include <netinet/ip.h>
1227625a SP	71	#include <netinet/tcp.h>
	72
	73	#include <protocols/dumprestore.h>
	74
	75	#include <ctype.h>
ddd2ef55 SP	76	#include <errno.h>
ddd2ef55 SP	77	#include <compaterr.h>
1227625a SP	78	#include <netdb.h>
1227625a SP	79	#include <pwd.h>
1227625a SP	80	#include <stdio.h>
	81	#ifdef __STDC__
	82	#include <stdlib.h>
	83	#include <string.h>
	84	#include <unistd.h>
	85	#endif
	86
	87	#ifdef __linux__
	88	#include <ext2fs/ext2fs.h>
	89	#endif
	90
	91	#include "pathnames.h"
	92	#include "dump.h"
	93
	94	#define TS_CLOSED 0
	95	#define TS_OPEN 1
	96
	97	static int rmtstate = TS_CLOSED;
0c62667d SP	98	static int tormtape = -1;
0c62667d SP	99	static int fromrmtape = -1;
ddd2ef55	100	static const char *rmtpeer = 0;
1227625a	101
ddd2ef55 SP	102	static int okname __P((const char *));
	103	static int rmtcall __P((const char , const char ));
	104	static void rmtconnaborted __P((int));
1227625a	105	static int rmtgetb __P((void));
0c62667d	106	static int rmtgetconn __P((void));
ddd2ef55 SP	107	static void rmtgets __P((char *, size_t));
ddd2ef55 SP	108	static int rmtreply __P((const char *));
0c62667d	109	static int piped_child __P((const char **command));
b45f51d6 SP	110	#ifdef KERBEROS
	111	int krcmd __P((char *, int /u_short/, char , char , int , char *));
	112	#endif
1227625a	113
b45f51d6 SP	114	static int errfd = -1;
b45f51d6 SP	115	extern int dokerberos;
1227625a	116	extern int ntrec; /* blocking factor on tape */
ddd2ef55 SP	117	#ifndef errno
	118	extern int errno;
	119	#endif
1227625a SP	120
1227625a SP	121	int
ddd2ef55	122	rmthost(const char *host)
1227625a	123	{
1227625a	124	if (rmtpeer)
ddd2ef55 SP	125	free((void *)rmtpeer);
ddd2ef55 SP	126	if ((rmtpeer = strdup(host)) == NULL)
1227625a SP	127	rmtpeer = host;
1227625a SP	128	signal(SIGPIPE, rmtconnaborted);
0c62667d	129	return rmtgetconn();
1227625a SP	130	}
	131
	132	static void
ddd2ef55	133	rmtconnaborted(int signo)
1227625a	134	{
b45f51d6 SP	135	msg("Lost connection to remote host.\n");
	136	if (errfd != -1) {
	137	fd_set r;
	138	struct timeval t;
	139
	140	FD_ZERO(&r);
	141	FD_SET(errfd, &r);
	142	t.tv_sec = 0;
	143	t.tv_usec = 0;
	144	if (select(errfd + 1, &r, NULL, NULL, &t)) {
	145	int i;
	146	char buf[2048];
	147
	148	if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
	149	buf[i] = '\0';
	150	msg("on %s: %s%s", rmtpeer, buf,
	151	buf[i - 1] == '\n' ? "" : "\n");
	152	}
	153	}
	154	}
1227625a	155
b45f51d6	156	exit(X_ABORT);
1227625a SP	157	}
1227625a SP	158
0c62667d	159	static int
ddd2ef55	160	rmtgetconn(void)
1227625a SP	161	{
1227625a SP	162	register char *cp;
b45f51d6	163	register const char *rmt;
1227625a SP	164	static struct servent *sp = NULL;
1227625a SP	165	static struct passwd *pwd = NULL;
ddd2ef55	166	const char *tuser;
0c62667d	167	const char *rsh;
1227625a	168	int size;
b45f51d6 SP	169	int throughput;
b45f51d6 SP	170	int on;
1227625a	171
0c62667d SP	172	rsh = getenv("RSH");
	173
	174	if (!rsh && sp == NULL) {
b45f51d6	175	sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
ddd2ef55 SP	176	if (sp == NULL)
ddd2ef55 SP	177	errx(1, "%s/tcp: unknown service",
b45f51d6	178	dokerberos ? "kshell" : "shell");
0c62667d SP	179	}
0c62667d SP	180	if (pwd == NULL) {
1227625a	181	pwd = getpwuid(getuid());
ddd2ef55 SP	182	if (pwd == NULL)
ddd2ef55 SP	183	errx(1, "who are you?");
1227625a SP	184	}
	185	if ((cp = strchr(rmtpeer, '@')) != NULL) {
	186	tuser = rmtpeer;
	187	*cp = '\0';
	188	if (!okname(tuser))
b45f51d6	189	exit(X_STARTUP);
1227625a SP	190	rmtpeer = ++cp;
	191	} else
	192	tuser = pwd->pw_name;
b45f51d6 SP	193	if ((rmt = getenv("RMT")) == NULL)
	194	rmt = _PATH_RMT;
	195	msg("");
0c62667d SP	196
	197	if (rsh) {
	198	const char *rshcmd[6];
	199	rshcmd[0] = rsh;
	200	rshcmd[1] = rmtpeer;
	201	rshcmd[2] = "-l";
	202	rshcmd[3] = tuser;
	203	rshcmd[4] = rmt;
	204	rshcmd[5] = NULL;
	205
	206	if (piped_child(rshcmd) < 0) {
	207	msg("cannot open connection\n");
	208	return 0;
	209	}
	210	}
	211	else {
b45f51d6	212	#ifdef KERBEROS
0c62667d SP	213	if (dokerberos)
	214	tormtape = krcmd((char **)&rmtpeer, sp->s_port, tuser, rmt, &errfd,
	215	(char *)0);
	216	else
b45f51d6	217	#endif
0c62667d SP	218	tormtape = rcmd((char **)&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
	219	tuser, rmt, &errfd);
	220	if (tormtape < 0) {
	221	msg("login to %s as %s failed.\n", rmtpeer, tuser);
	222	return 0;
	223	}
	224	size = ntrec * TP_BSIZE;
	225	if (size > 60 * 1024) /* XXX */
	226	size = 60 * 1024;
	227	/* Leave some space for rmt request/response protocol */
	228	size += 2 * 1024;
	229	while (size > TP_BSIZE &&
	230	setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
	231	size -= TP_BSIZE;
	232	(void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
	233	throughput = IPTOS_THROUGHPUT;
	234	if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
	235	&throughput, sizeof(throughput)) < 0)
	236	perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
	237	on = 1;
	238	if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
	239	perror("TCP_NODELAY setsockopt");
	240	fromrmtape = tormtape;
b45f51d6 SP	241	}
b45f51d6 SP	242	(void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
0c62667d	243	return 1;
1227625a SP	244	}
	245
	246	static int
ddd2ef55	247	okname(const char *cp0)
1227625a	248	{
ddd2ef55	249	register const char *cp;
1227625a SP	250	register int c;
	251
	252	for (cp = cp0; *cp; cp++) {
	253	c = *cp;
	254	if (!isascii(c) \|\| !(isalnum(c) \|\| c == '_' \|\| c == '-')) {
ddd2ef55	255	warnx("invalid user name %s\n", cp0);
1227625a SP	256	return (0);
	257	}
	258	}
	259	return (1);
	260	}
	261
	262	int
ddd2ef55	263	rmtopen(const char *tape, int mode)
1227625a	264	{
ddd2ef55	265	char buf[MAXPATHLEN];
1227625a	266
ddd2ef55	267	(void)snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
1227625a SP	268	rmtstate = TS_OPEN;
	269	return (rmtcall(tape, buf));
	270	}
	271
	272	void
ddd2ef55	273	rmtclose(void)
1227625a SP	274	{
	275
	276	if (rmtstate != TS_OPEN)
	277	return;
	278	rmtcall("close", "C\n");
	279	rmtstate = TS_CLOSED;
	280	}
	281
	282	int
ddd2ef55	283	rmtread(char *buf, size_t count)
1227625a SP	284	{
1227625a SP	285	char line[30];
ddd2ef55 SP	286	int n, i;
ddd2ef55 SP	287	ssize_t cc;
1227625a	288
ddd2ef55	289	(void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
1227625a	290	n = rmtcall("read", line);
b45f51d6 SP	291	if (n < 0)
	292	/* rmtcall() properly sets errno for us on errors. */
	293	return (n);
1227625a	294	for (i = 0; i < n; i += cc) {
0c62667d	295	cc = read(fromrmtape, buf+i, n - i);
b45f51d6	296	if (cc <= 0)
ddd2ef55	297	rmtconnaborted(0);
1227625a SP	298	}
	299	return (n);
	300	}
	301
	302	int
ddd2ef55	303	rmtwrite(const char *buf, size_t count)
1227625a SP	304	{
	305	char line[30];
	306
b45f51d6	307	(void)snprintf(line, sizeof (line), "W%d\n", count);
0c62667d SP	308	write(tormtape, line, strlen(line));
0c62667d SP	309	write(tormtape, buf, count);
1227625a SP	310	return (rmtreply("write"));
	311	}
	312
1227625a	313	int
ddd2ef55	314	rmtseek(int offset, int pos)
1227625a SP	315	{
	316	char line[80];
	317
b45f51d6	318	(void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
1227625a SP	319	return (rmtcall("seek", line));
	320	}
	321
	322	struct mtget mts;
	323
	324	struct mtget *
ddd2ef55	325	rmtstatus(void)
1227625a SP	326	{
	327	register int i;
	328	register char *cp;
	329
	330	if (rmtstate != TS_OPEN)
	331	return (NULL);
	332	rmtcall("status", "S\n");
	333	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
	334	*cp++ = rmtgetb();
	335	return (&mts);
	336	}
	337
	338	int
ddd2ef55	339	rmtioctl(int cmd, int count)
1227625a SP	340	{
	341	char buf[256];
	342
	343	if (count < 0)
	344	return (-1);
b45f51d6	345	(void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
1227625a SP	346	return (rmtcall("ioctl", buf));
	347	}
	348
	349	static int
ddd2ef55	350	rmtcall(const char cmd, const char buf)
1227625a SP	351	{
1227625a SP	352
0c62667d	353	if (write(tormtape, buf, strlen(buf)) != strlen(buf))
ddd2ef55	354	rmtconnaborted(0);
1227625a SP	355	return (rmtreply(cmd));
	356	}
	357
	358	static int
ddd2ef55	359	rmtreply(const char *cmd)
1227625a SP	360	{
	361	register char *cp;
	362	char code[30], emsg[BUFSIZ];
	363
	364	rmtgets(code, sizeof (code));
	365	if (code == 'E' \|\| code == 'F') {
	366	rmtgets(emsg, sizeof (emsg));
	367	msg("%s: %s", cmd, emsg);
b45f51d6 SP	368	errno = atoi(code + 1);
b45f51d6 SP	369	if (*code == 'F')
1227625a	370	rmtstate = TS_CLOSED;
1227625a SP	371	return (-1);
	372	}
	373	if (*code != 'A') {
	374	/* Kill trailing newline */
	375	cp = code + strlen(code);
	376	if (cp > code && *--cp == '\n')
	377	*cp = '\0';
	378
	379	msg("Protocol to remote tape server botched (code \"%s\").\n",
	380	code);
ddd2ef55	381	rmtconnaborted(0);
1227625a SP	382	}
	383	return (atoi(code + 1));
	384	}
	385
ddd2ef55 SP	386	static int
ddd2ef55 SP	387	rmtgetb(void)
1227625a SP	388	{
	389	char c;
	390
0c62667d	391	if (read(fromrmtape, &c, 1) != 1)
ddd2ef55	392	rmtconnaborted(0);
1227625a SP	393	return (c);
	394	}
	395
	396	/* Get a line (guaranteed to have a trailing newline). */
ddd2ef55 SP	397	static void
ddd2ef55 SP	398	rmtgets(char *line, size_t len)
1227625a SP	399	{
	400	register char *cp = line;
	401
	402	while (len > 1) {
	403	*cp = rmtgetb();
	404	if (*cp == '\n') {
	405	cp[1] = '\0';
	406	return;
	407	}
	408	cp++;
	409	len--;
	410	}
	411	*cp = '\0';
	412	msg("Protocol to remote tape server botched.\n");
	413	msg("(rmtgets got \"%s\").\n", line);
ddd2ef55	414	rmtconnaborted(0);
1227625a	415	}
0c62667d SP	416
	417	int piped_child(const char **command) {
	418	int pid;
	419	int to_child_pipe[2];
	420	int from_child_pipe[2];
	421
	422	if (pipe (to_child_pipe) < 0) {
	423	msg ("cannot create pipe: %s\n", strerror(errno));
	424	return -1;
	425	}
	426	if (pipe (from_child_pipe) < 0) {
	427	msg ("cannot create pipe: %s\n", strerror(errno));
	428	return -1;
	429	}
	430	pid = fork ();
	431	if (pid < 0) {
	432	msg ("cannot fork: %s\n", strerror(errno));
	433	return -1;
	434	}
	435	if (pid == 0) {
	436	if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
	437	msg ("cannot dup2 pipe: %s\n", strerror(errno));
	438	exit(1);
	439	}
	440	if (close (to_child_pipe[1]) < 0) {
	441	msg ("cannot close pipe: %s\n", strerror(errno));
	442	exit(1);
	443	}
	444	if (close (from_child_pipe[0]) < 0) {
	445	msg ("cannot close pipe: %s\n", strerror(errno));
	446	exit(1);
	447	}
	448	if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
	449	msg ("cannot dup2 pipe: %s\n", strerror(errno));
	450	exit(1);
	451	}
	452	execvp (command[0], (char const ) command);
	453	msg("cannot exec %s: %s\n", command[0], strerror(errno));
	454	exit(1);
	455	}
	456	if (close (to_child_pipe[0]) < 0) {
	457	msg ("cannot close pipe: %s\n", strerror(errno));
	458	return -1;
	459	}
	460	if (close (from_child_pipe[1]) < 0) {
	461	msg ("cannot close pipe: %s\n", strerror(errno));
	462	return -1;
	463	}
	464	tormtape = to_child_pipe[1];
	465	fromrmtape = from_child_pipe[0];
	466	return pid;
	467	}