#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/ip.h>
#include<arpa/inet.h>
#include<string.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;
	bind(skt, (const sockaddr*)&sad, sizeof(sad));

	char message[1024];
	struct sockaddr_in src_addr;
	socklen_t addrlen;
	const char *reply = "There was a pig in the ceiling, but it fell out through a hole\n";
	for(;;){
		size_t msglen = recvfrom(skt, message, 1024, 0, (struct sockaddr*)&src_addr, &addrlen);
		message[msglen] = 0;
		printf("Message from %s:%d : %s\n", inet_ntoa(src_addr.sin_addr), src_addr.sin_port, message);
		sendto(skt, reply, strlen(reply), 0, (struct sockaddr*)&src_addr, addrlen);
	}

	return 0;
}