#include <sys/socket.h>

#include <netinet/in.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h> /* getopt */

#define HOST "192.168.0.1"
#define PORT (22)

int main(argc, argv)
	int argc;
	char *argv[];
{
	int sockfd;
	int c;
	struct linger ling;
	struct sockaddr_in servaddr;
	char *host = HOST;
	unsigned short port = PORT;
	


	while ((c = getopt(argc, argv, "h:p:")) != -1) {
		switch (c) {
			case 'h':
				host = (char *)strdup(optarg);
				break;
			case 'p':
				port = atoi(optarg);
				break;
			default:
				break;
		}
	}

	sockfd = socket(AF_INET, SOCK_STREAM, 0);

	if (sockfd < 0) {
		printf("socket\n");
		exit(1);
	}

	bzero(&servaddr, sizeof(struct sockaddr_in));

	servaddr.sin_family = AF_INET;
	servaddr.sin_port   = htons(port);
	servaddr.sin_addr.s_addr   = inet_addr(host);

	ling.l_onoff = 1;
	ling.l_linger = 0;

	if (setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling)) < 0) {
		printf("setsockopt\n");
		exit(1);
	}

	printf("connecting ..\n");
	if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(struct sockaddr_in)) < 0) {
		printf("connect: %s\n", strerror(errno));
		exit(1);
	}

	printf("closing ...\n");
	close(sockfd);	/* send RST */
	printf("closed.\n");

	exit(0);
}