#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/ip.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<stdio.h>



int main(){
	int skt = socket(AF_INET, SOCK_DGRAM, 0);

	struct sockaddr_in sad;
	sad.sin_port = htons(5141);
	sad.sin_addr.s_addr = INADDR_ANY;
	sad.sin_family = AF_INET;
	if( bind(skt, (struct sockaddr *)(&sad), sizeof(struct sockaddr_in)) ){ // step 2
		perror("bind");
		return 1;
	}

	char buffer[1024];
	struct sockaddr_in sender_address;
	socklen_t sad_len = sizeof(sender_address);
	while(1){
		ssize_t reclen = recvfrom(skt, buffer, 1024, 0, (struct sockaddr *)&sender_address, &sad_len);
		buffer[reclen] = 0;
		printf("Received \"%s\" from %s on port %d\n", buffer, inet_ntoa(sender_address.sin_addr), ntohs(sender_address.sin_port));
		sendto(skt, "Elephant", 9, 0, (struct sockaddr *)&sender_address, sad_len);
		
	}
	return 0;
}