[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 1.9 2000/01/11 12:33:44 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;
int rshpid = -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 ((rshpid = 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);
		}
		setpgid(0, getpid());
		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[] =
b80c25f8	43	"$Id: dumprmt.c,v 1.9 2000/01/11 12:33:44 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;
f34aca37	100	int rshpid = -1;
ddd2ef55	101	static const char *rmtpeer = 0;
1227625a	102
ddd2ef55 SP	103	static int okname __P((const char *));
	104	static int rmtcall __P((const char , const char ));
	105	static void rmtconnaborted __P((int));
1227625a	106	static int rmtgetb __P((void));
0c62667d	107	static int rmtgetconn __P((void));
ddd2ef55 SP	108	static void rmtgets __P((char *, size_t));
ddd2ef55 SP	109	static int rmtreply __P((const char *));
0c62667d	110	static int piped_child __P((const char **command));
b45f51d6 SP	111	#ifdef KERBEROS
	112	int krcmd __P((char *, int /u_short/, char , char , int , char *));
	113	#endif
1227625a	114
b45f51d6 SP	115	static int errfd = -1;
b45f51d6 SP	116	extern int dokerberos;
1227625a	117	extern int ntrec; /* blocking factor on tape */
ddd2ef55 SP	118	#ifndef errno
	119	extern int errno;
	120	#endif
1227625a SP	121
1227625a SP	122	int
ddd2ef55	123	rmthost(const char *host)
1227625a	124	{
1227625a	125	if (rmtpeer)
ddd2ef55 SP	126	free((void *)rmtpeer);
ddd2ef55 SP	127	if ((rmtpeer = strdup(host)) == NULL)
1227625a SP	128	rmtpeer = host;
1227625a SP	129	signal(SIGPIPE, rmtconnaborted);
0c62667d	130	return rmtgetconn();
1227625a SP	131	}
	132
	133	static void
ddd2ef55	134	rmtconnaborted(int signo)
1227625a	135	{
b45f51d6 SP	136	msg("Lost connection to remote host.\n");
	137	if (errfd != -1) {
	138	fd_set r;
	139	struct timeval t;
	140
	141	FD_ZERO(&r);
	142	FD_SET(errfd, &r);
	143	t.tv_sec = 0;
	144	t.tv_usec = 0;
	145	if (select(errfd + 1, &r, NULL, NULL, &t)) {
	146	int i;
	147	char buf[2048];
	148
	149	if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
	150	buf[i] = '\0';
	151	msg("on %s: %s%s", rmtpeer, buf,
	152	buf[i - 1] == '\n' ? "" : "\n");
	153	}
	154	}
	155	}
1227625a	156
b45f51d6	157	exit(X_ABORT);
1227625a SP	158	}
1227625a SP	159
0c62667d	160	static int
ddd2ef55	161	rmtgetconn(void)
1227625a SP	162	{
1227625a SP	163	register char *cp;
b45f51d6	164	register const char *rmt;
1227625a SP	165	static struct servent *sp = NULL;
1227625a SP	166	static struct passwd *pwd = NULL;
ddd2ef55	167	const char *tuser;
0c62667d	168	const char *rsh;
1227625a	169	int size;
b45f51d6 SP	170	int throughput;
b45f51d6 SP	171	int on;
1227625a	172
0c62667d SP	173	rsh = getenv("RSH");
	174
	175	if (!rsh && sp == NULL) {
b45f51d6	176	sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
ddd2ef55 SP	177	if (sp == NULL)
ddd2ef55 SP	178	errx(1, "%s/tcp: unknown service",
b45f51d6	179	dokerberos ? "kshell" : "shell");
0c62667d SP	180	}
0c62667d SP	181	if (pwd == NULL) {
1227625a	182	pwd = getpwuid(getuid());
ddd2ef55 SP	183	if (pwd == NULL)
ddd2ef55 SP	184	errx(1, "who are you?");
1227625a SP	185	}
	186	if ((cp = strchr(rmtpeer, '@')) != NULL) {
	187	tuser = rmtpeer;
	188	*cp = '\0';
	189	if (!okname(tuser))
b45f51d6	190	exit(X_STARTUP);
1227625a SP	191	rmtpeer = ++cp;
	192	} else
	193	tuser = pwd->pw_name;
b45f51d6 SP	194	if ((rmt = getenv("RMT")) == NULL)
	195	rmt = _PATH_RMT;
	196	msg("");
0c62667d SP	197
	198	if (rsh) {
	199	const char *rshcmd[6];
	200	rshcmd[0] = rsh;
	201	rshcmd[1] = rmtpeer;
	202	rshcmd[2] = "-l";
	203	rshcmd[3] = tuser;
	204	rshcmd[4] = rmt;
	205	rshcmd[5] = NULL;
	206
f34aca37	207	if ((rshpid = piped_child(rshcmd)) < 0) {
0c62667d SP	208	msg("cannot open connection\n");
	209	return 0;
	210	}
	211	}
	212	else {
b45f51d6	213	#ifdef KERBEROS
0c62667d SP	214	if (dokerberos)
	215	tormtape = krcmd((char **)&rmtpeer, sp->s_port, tuser, rmt, &errfd,
	216	(char *)0);
	217	else
b45f51d6	218	#endif
0c62667d SP	219	tormtape = rcmd((char **)&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
	220	tuser, rmt, &errfd);
	221	if (tormtape < 0) {
	222	msg("login to %s as %s failed.\n", rmtpeer, tuser);
	223	return 0;
	224	}
	225	size = ntrec * TP_BSIZE;
	226	if (size > 60 * 1024) /* XXX */
	227	size = 60 * 1024;
	228	/* Leave some space for rmt request/response protocol */
	229	size += 2 * 1024;
	230	while (size > TP_BSIZE &&
	231	setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
	232	size -= TP_BSIZE;
	233	(void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
	234	throughput = IPTOS_THROUGHPUT;
	235	if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
	236	&throughput, sizeof(throughput)) < 0)
	237	perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
	238	on = 1;
	239	if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
	240	perror("TCP_NODELAY setsockopt");
	241	fromrmtape = tormtape;
b45f51d6 SP	242	}
b45f51d6 SP	243	(void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
0c62667d	244	return 1;
1227625a SP	245	}
	246
	247	static int
ddd2ef55	248	okname(const char *cp0)
1227625a	249	{
ddd2ef55	250	register const char *cp;
1227625a SP	251	register int c;
	252
	253	for (cp = cp0; *cp; cp++) {
	254	c = *cp;
	255	if (!isascii(c) \|\| !(isalnum(c) \|\| c == '_' \|\| c == '-')) {
ddd2ef55	256	warnx("invalid user name %s\n", cp0);
1227625a SP	257	return (0);
	258	}
	259	}
	260	return (1);
	261	}
	262
	263	int
ddd2ef55	264	rmtopen(const char *tape, int mode)
1227625a	265	{
ddd2ef55	266	char buf[MAXPATHLEN];
1227625a	267
ddd2ef55	268	(void)snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
1227625a SP	269	rmtstate = TS_OPEN;
	270	return (rmtcall(tape, buf));
	271	}
	272
	273	void
ddd2ef55	274	rmtclose(void)
1227625a SP	275	{
	276
	277	if (rmtstate != TS_OPEN)
	278	return;
	279	rmtcall("close", "C\n");
	280	rmtstate = TS_CLOSED;
	281	}
	282
	283	int
ddd2ef55	284	rmtread(char *buf, size_t count)
1227625a SP	285	{
1227625a SP	286	char line[30];
ddd2ef55 SP	287	int n, i;
ddd2ef55 SP	288	ssize_t cc;
1227625a	289
ddd2ef55	290	(void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
1227625a	291	n = rmtcall("read", line);
b45f51d6 SP	292	if (n < 0)
	293	/* rmtcall() properly sets errno for us on errors. */
	294	return (n);
1227625a	295	for (i = 0; i < n; i += cc) {
0c62667d	296	cc = read(fromrmtape, buf+i, n - i);
b45f51d6	297	if (cc <= 0)
ddd2ef55	298	rmtconnaborted(0);
1227625a SP	299	}
	300	return (n);
	301	}
	302
	303	int
ddd2ef55	304	rmtwrite(const char *buf, size_t count)
1227625a SP	305	{
	306	char line[30];
	307
b45f51d6	308	(void)snprintf(line, sizeof (line), "W%d\n", count);
0c62667d SP	309	write(tormtape, line, strlen(line));
0c62667d SP	310	write(tormtape, buf, count);
1227625a SP	311	return (rmtreply("write"));
	312	}
	313
1227625a	314	int
ddd2ef55	315	rmtseek(int offset, int pos)
1227625a SP	316	{
	317	char line[80];
	318
b45f51d6	319	(void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
1227625a SP	320	return (rmtcall("seek", line));
	321	}
	322
	323	struct mtget mts;
	324
	325	struct mtget *
ddd2ef55	326	rmtstatus(void)
1227625a SP	327	{
	328	register int i;
	329	register char *cp;
	330
	331	if (rmtstate != TS_OPEN)
	332	return (NULL);
	333	rmtcall("status", "S\n");
	334	for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
	335	*cp++ = rmtgetb();
	336	return (&mts);
	337	}
	338
	339	int
ddd2ef55	340	rmtioctl(int cmd, int count)
1227625a SP	341	{
	342	char buf[256];
	343
	344	if (count < 0)
	345	return (-1);
b45f51d6	346	(void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
1227625a SP	347	return (rmtcall("ioctl", buf));
	348	}
	349
	350	static int
ddd2ef55	351	rmtcall(const char cmd, const char buf)
1227625a SP	352	{
1227625a SP	353
0c62667d	354	if (write(tormtape, buf, strlen(buf)) != strlen(buf))
ddd2ef55	355	rmtconnaborted(0);
1227625a SP	356	return (rmtreply(cmd));
	357	}
	358
	359	static int
ddd2ef55	360	rmtreply(const char *cmd)
1227625a SP	361	{
	362	register char *cp;
	363	char code[30], emsg[BUFSIZ];
	364
	365	rmtgets(code, sizeof (code));
	366	if (code == 'E' \|\| code == 'F') {
	367	rmtgets(emsg, sizeof (emsg));
	368	msg("%s: %s", cmd, emsg);
b45f51d6 SP	369	errno = atoi(code + 1);
b45f51d6 SP	370	if (*code == 'F')
1227625a	371	rmtstate = TS_CLOSED;
1227625a SP	372	return (-1);
	373	}
	374	if (*code != 'A') {
	375	/* Kill trailing newline */
	376	cp = code + strlen(code);
	377	if (cp > code && *--cp == '\n')
	378	*cp = '\0';
	379
	380	msg("Protocol to remote tape server botched (code \"%s\").\n",
	381	code);
ddd2ef55	382	rmtconnaborted(0);
1227625a SP	383	}
	384	return (atoi(code + 1));
	385	}
	386
ddd2ef55 SP	387	static int
ddd2ef55 SP	388	rmtgetb(void)
1227625a SP	389	{
	390	char c;
	391
0c62667d	392	if (read(fromrmtape, &c, 1) != 1)
ddd2ef55	393	rmtconnaborted(0);
1227625a SP	394	return (c);
	395	}
	396
	397	/* Get a line (guaranteed to have a trailing newline). */
ddd2ef55 SP	398	static void
ddd2ef55 SP	399	rmtgets(char *line, size_t len)
1227625a SP	400	{
	401	register char *cp = line;
	402
	403	while (len > 1) {
	404	*cp = rmtgetb();
	405	if (*cp == '\n') {
	406	cp[1] = '\0';
	407	return;
	408	}
	409	cp++;
	410	len--;
	411	}
	412	*cp = '\0';
	413	msg("Protocol to remote tape server botched.\n");
	414	msg("(rmtgets got \"%s\").\n", line);
ddd2ef55	415	rmtconnaborted(0);
1227625a	416	}
0c62667d SP	417
	418	int piped_child(const char **command) {
	419	int pid;
	420	int to_child_pipe[2];
	421	int from_child_pipe[2];
	422
	423	if (pipe (to_child_pipe) < 0) {
	424	msg ("cannot create pipe: %s\n", strerror(errno));
	425	return -1;
	426	}
	427	if (pipe (from_child_pipe) < 0) {
	428	msg ("cannot create pipe: %s\n", strerror(errno));
	429	return -1;
	430	}
	431	pid = fork ();
	432	if (pid < 0) {
	433	msg ("cannot fork: %s\n", strerror(errno));
	434	return -1;
	435	}
	436	if (pid == 0) {
	437	if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
	438	msg ("cannot dup2 pipe: %s\n", strerror(errno));
	439	exit(1);
	440	}
	441	if (close (to_child_pipe[1]) < 0) {
	442	msg ("cannot close pipe: %s\n", strerror(errno));
	443	exit(1);
	444	}
	445	if (close (from_child_pipe[0]) < 0) {
	446	msg ("cannot close pipe: %s\n", strerror(errno));
	447	exit(1);
	448	}
	449	if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
	450	msg ("cannot dup2 pipe: %s\n", strerror(errno));
	451	exit(1);
	452	}
b80c25f8	453	setpgid(0, getpid());
0c62667d SP	454	execvp (command[0], (char const ) command);
	455	msg("cannot exec %s: %s\n", command[0], strerror(errno));
	456	exit(1);
	457	}
	458	if (close (to_child_pipe[0]) < 0) {
	459	msg ("cannot close pipe: %s\n", strerror(errno));
	460	return -1;
	461	}
	462	if (close (from_child_pipe[1]) < 0) {
	463	msg ("cannot close pipe: %s\n", strerror(errno));
	464	return -1;
	465	}
	466	tormtape = to_child_pipe[1];
	467	fromrmtape = from_child_pipe[0];
	468	return pid;
	469	}