#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#define HOSTNAME "localhost"
#define PORT "1235"

int main(int argc, char** argv) {
	int status, sock, bytes_sent;
	struct addrinfo hints, *servinfo;
	char msg[] = "hello!!";
	memset(&hints, 0, sizeof hints);
	hints.ai_family = AF_INET;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_flags = AI_PASSIVE;
	
	//Not correct usage, print help and exit.
	if (argc != 3) {
		printf("Usage : %s HOSTNAME PORT\n", argv[0]);
		return -1;
	}
	//get info about remote host.
	if ((status = getaddrinfo(argv[1], argv[2], &hints, &servinfo)) != 0) {
		printf("Error during getaddrinfo() : %s\n", gai_strerror(status));
		return -1;
	}
	//Initialize socket.
	if ((sock = socket(servinfo->ai_family, servinfo->ai_socktype, servinfo->ai_protocol)) == -1) {
		printf(" Error during socket() : %s\n", strerror(errno));
		freeaddrinfo(servinfo); //free servinfo allocated space and exit.
		return -1;
	}
	//connect to remote host.
	if (connect(sock, servinfo->ai_addr, servinfo->ai_addrlen) == -1 ) {
		printf("Error during connect() : %s\n", strerror(errno));
		freeaddrinfo(servinfo);
		close(sock); //Also close the socket.
		return -1;
	}
	if ( (bytes_sent = send(sock, msg, strlen(msg), 0)) == -1 ) {
		printf("Error during send() : %s\n", strerror(errno));
		freeaddrinfo(servinfo);
		close(sock);
		return -1;
	}
	
	printf("Sent %d bytes.\n", bytes_sent);
	freeaddrinfo(servinfo);
	close(sock);
	return 0;
}