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

#define DATA "The sea is calm tonight, the tide is full . . ."

int
main(int argc, char **argv)
{
	int sock;
	struct sockaddr_in name;
	struct hostent *hp, *gethostbyname();

	/* Create socket on which to send. */
	sock = socket(AF_INET, SOCK_DGRAM, 0);
	if (sock < 0) {
		perror("opening datagram socket");
		exit(1);
	}
	/*
	* Construct name,  with no wildcards,  of the socket  to send to.
	* gethostbyname()  returns  a structure  including  the network address
	* of the specified host.  The port number is taken from the command
	* line.
	*/
	hp = gethostbyname(argv[1]);
	if (hp == 0) {
		fprintf(stderr, "%s: unknown host\n", argv[1]);
		exit(2);
	}
	memcpy(&name.sin_addr, hp->h_addr, hp->h_length);
	name.sin_family = AF_INET;
	name.sin_port = htons(atoi(argv[2]));
	/* Send message. */
	if (sendto(sock, DATA, sizeof(DATA), 0, (struct sockaddr *)&name, sizeof(name)) < 0)
		perror("sending datagram message");
	close(sock);
	return 0;
}