#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define ISIZE (sizeof(struct sockaddr_in))
#define MAXCONN 3
#define BUFSIZE 32

int main(int argc, char *argv[]) {
	int fd, connfd, sz, port;
	struct sockaddr_in srv, peer;
	char buf[32];
	char addr[INET_ADDRSTRLEN+1];
	unsigned peersz=ISIZE;

	memset(&srv, 0, ISIZE);
	srv.sin_family = AF_INET;
	inet_pton(AF_INET, argv[1], &(srv.sin_addr));
	srv.sin_port = htons(atoi(argv[2]));

	fd = socket(AF_INET, SOCK_STREAM, 0);

	bind(fd, (struct sockaddr*) &srv, ISIZE);

	listen(fd, MAXCONN);

	while(1) {
		connfd = accept(fd, (struct sockaddr *) &peer, &peersz);
		sz = recv(connfd, buf, BUFSIZE, 0);
		inet_ntop(AF_INET, &peer.sin_addr, addr, INET_ADDRSTRLEN);
		port = ntohs(peer.sin_port);
		printf("Received %d bytes from %s, port %d\n", sz, addr, port);
		send(connfd, buf, sz, 0);
		close(connfd);
	}
	return 0;
}