/* $Id: barrier.c,v 1.13 2001/08/13 20:55:24 garbled Exp $ */
/*
 * Copyright (c) 1998, 1999, 2000
 *	Tim Rightnour.  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 Tim Rightnour.
 * 4. The name of Tim Rightnour may not be used to endorse or promote 
 *    products derived from this software without specific prior written 
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TIM RIGHTNOUR ``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 TIM RIGHTNOUR 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.
 */

#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>

#include "../common/common.h"
#include "../common/sockcommon.h"

#if !defined(lint) && defined(__NetBSD__)
__COPYRIGHT(
"@(#) Copyright (c) 1998, 1999, 2000\n\
        Tim Rightnour.  All rights reserved\n");
__RCSID("$Id: barrier.c,v 1.13 2001/08/13 20:55:24 garbled Exp $");
#endif

int quietflag, barrier_port, debug;
char *barrier_host;
char *progname;

#ifndef __P
#define __P(protos) protos
#endif

int make_barrier __P((char *key, int nodes));
int write_to_server __P((int filedes, char *buf));
void log_bailout __P((int));

int
main(int argc, char *argv[])
{
	extern char *optarg;

	char *key;
	int nodes, ch, code;
	
	barrier_port = BARRIER_SOCK;
	barrier_host = NULL;
	quietflag = 1;
	key = NULL;
	nodes = 0;

	while ((ch = getopt(argc, argv, "?dh:k:p:s:")) != -1)
		switch (ch) {
		case 'q':
			quietflag = 0;
			break;
		case 'h':
			barrier_host = strdup(optarg);
			break;
		case 'k':
			key = strdup(optarg);
			break;
		case 'p':
			barrier_port = atoi(optarg);
			break;
		case 's':
			nodes = atoi(optarg);
			break;
		case '?':
			(void)fprintf(stderr, "usage: barrier [-q] [-h barrier_host]"
			    " [-k key] [-p port] -s cluster_size\n");
			exit(EXIT_FAILURE);
			break;
		default:
			break;
	}
	if (nodes < 1) {
		(void)fprintf(stderr, "usage: barrier [-q] [-h barrier_host] "
			"[-k key] [-p port] -s cluster_size\n");
		exit(EXIT_FAILURE);
	}
	if (key == NULL)
		key = strdup("barrier");
	if (key == NULL)
		bailout(__LINE__);

	if (barrier_port == BARRIER_SOCK)
		if (getenv("BARRIER_PORT") != NULL)
			barrier_port = atoi(getenv("BARRIER_PORT"));

	if (barrier_host == NULL) {
		if (getenv("BARRIER_HOST") != NULL)
			barrier_host = strdup(getenv("BARRIER_HOST"));
		else {
			(void)fprintf(stderr, "No barrier host given on command line,"
				" and BARRIER_HOST environment not found.\n");
			exit(EXIT_FAILURE);
		}
	}

	code = make_barrier(key, nodes);
	if (code == 6) {
		if (!quietflag)
			(void)printf("Barrier met, continuing: %s\n", key);
		return(EXIT_SUCCESS);
	} else
		if (!quietflag)
			(void)printf("Barrier encountered a server error, aborting.\n");
	return(EXIT_FAILURE); 
}

int make_barrier(key, nodes)
	char *key;
	int nodes;
{
	int sock;
	char *p;
	char message[256];
	struct sockaddr_in name;
	struct hostent *hostinfo;

	/* create socket */
	sock = socket(PF_INET, SOCK_STREAM, 0);
	if (sock < 0) {
		perror("socket");
		exit(EXIT_FAILURE);
	}

	name.sin_family = AF_INET;
	name.sin_port = htons(barrier_port);
	hostinfo = gethostbyname(barrier_host);

	if (hostinfo == NULL) {
		(void)fprintf(stderr, "Unknown host %s.\n", barrier_host);
		exit(EXIT_FAILURE);
	}

	name.sin_addr = *(struct in_addr *) hostinfo->h_addr;

	if (connect (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
		perror ("connect");
		exit (EXIT_FAILURE);
	}
	if (!quietflag)
		(void)printf("Barrier syncing with token: %s\n", key);
	(void)sprintf(message, "%s %d", key, nodes);
	write_to_server(sock, message);
	return(read(sock, &p, 6));
}

int write_to_server(int filedes, char *buf)
{
	int nbytes;

	nbytes = write(filedes, buf, strlen(buf));
	if (nbytes < 0) {
		return(EXIT_FAILURE);
	}
	return(0);
}

void
log_bailout(line)
{
	bailout(line);
}