/*-
 * Copyright (c) 1980 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.
 */

#if	!defined(lint) && defined(DOSCCS)
static char sccsid[] = "@(#)dumprmt.c	1.2 (2.11BSD GTE) 12/7/94";
#endif

#include <sys/param.h>
#include <sys/mtio.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/inode.h>
#include <signal.h>
#include <netinet/in.h>
#include <netdb.h>
#include <protocols/dumprestor.h>
#include <pwd.h>
#include <stdio.h>

#define	TS_CLOSED	0
#define	TS_OPEN		1

#define	rmtstate	rstate
static	int rmtstate = TS_CLOSED;
int	rmtape;
void	rmtgetconn();
void	rmtconnaborted();
int	rmtreply();
int	rmtgetb();
void	rmtgets();
int	rmtcall();
char	*rmtpeer;

extern void msg();

int
rmthost(host)
	char *host;
{

	rmtpeer = host;
	signal(SIGPIPE, rmtconnaborted);
	rmtgetconn();
	if (rmtape < 0)
		return (0);
	return (1);
}

void
rmtconnaborted()
{

	fprintf(stderr, "rdump: Lost connection to remote host.\n");
	exit(1);
}

void
rmtgetconn()
{
	static struct servent *sp = 0;
	struct passwd *pw;
	char *name = "root";
	int size;

	if (sp == 0) {
		sp = getservbyname("shell", "tcp");
		if (sp == 0) {
			fprintf(stderr, "rdump: shell/tcp: unknown service\n");
			exit(1);
		}
	}
	pw = getpwuid(getuid());
	if (pw && pw->pw_name)
		name = pw->pw_name;
	rmtape = rcmd(&rmtpeer, sp->s_port, name, name, "rmt", 0);
	size = NTREC * DEV_BSIZE;
	while (size > DEV_BSIZE &&
	    setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
		size -= DEV_BSIZE;
}

int
rmtopen(tape, mode)
	char *tape;
	int mode;
{
	char buf[256];

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

void
rmtclose()
{

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

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

	(void)sprintf(line, "W%d\n", count);
	write(rmtape, line, strlen(line));
	write(rmtape, buf, count);
	return (rmtreply("write"));
}

int
rmtcall(cmd, buf)
	char *cmd, *buf;
{

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

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

	rmtgets(code, sizeof (code));
	if (*code == 'E' || *code == 'F') {
		rmtgets(emsg, sizeof (emsg));
		msg("%s: %s\n", cmd, emsg, code + 1);
		if (*code == 'F') {
			rmtstate = TS_CLOSED;
			return (-1);
		}
		return (-1);
	}
	if (*code != 'A') {
		msg("Protocol to remote tape server botched (code %s?).\n",
		    code);
		rmtconnaborted();
	}
	return (atoi(code + 1));
}

int
rmtgetb()
{
	char c;

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

void
rmtgets(cp, len)
	char *cp;
	int len;
{

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