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

void listen_for_client(int skt){
	int client_fd;
	struct sockaddr_in client_address;
	char client_message[8];
	char *cm = client_message;
	printf("Client message[64] = %x, needs to be %x\n", client_message[64], client_message[64] - 0x32);
//	client_message[48] = 0x7a;
	
	socklen_t address_size = sizeof(struct sockaddr_in);
	printf("Listening on socket %d\n", skt);
	client_fd = accept(skt, (struct sockaddr *)(&client_address), &address_size); // step 4
	ssize_t readlen = read(client_fd, cm, 200);
	printf("Client sent:  %s\n", client_message);
	printf("Connection made from address %s, fd %d\n", inet_ntoa(client_address.sin_addr), client_fd);
	close(client_fd);
}

int main(int argc, char ** argv){
	struct sockaddr_in sad;
	sad.sin_port = htons(5143);
	sad.sin_addr.s_addr = INADDR_ANY;
	sad.sin_family = AF_INET;

	int skt = socket(AF_INET, SOCK_STREAM, 0); // Step 1
	if(skt == -1){
		perror("socket");
		return 1;
	}
	if( bind(skt, (struct sockaddr*)(&sad), sizeof(struct sockaddr_in)) ){ // step 2
		perror("bind");
		return 1;
	}
	if( listen(skt, 5) ){ // step 3
		perror("listen");
		return 1;
	}
	if(argc > 1 && !strcmp(argv[1], "admin")){
		puts("This is an administration only feature");
		puts("The secret password is gerbil");
	}
	printf("We can't print this twice!\n");
	while(1){
		listen_for_client(skt);
	}
	
	return 0;
}