authRTESFinalAssignment/lib/helpers.c

#include "helpers.h"

int create_socket(uint16_t port) {
	int sock;
	struct sockaddr_in socket_name;

	// Creates the socket
	sock = socket (PF_INET, SOCK_STREAM, 0); //TODO: check if PF_INET is the right one
	if (sock < 0) {
		perror("Couldn't create the socket.");
		exit(EXIT_FAILURE);
	}

	// Gives the socket a name
	socket_name.sin_family = AF_INET;
	socket_name.sin_port = htons(port);
	socket_name.sin_addr.s_addr = htonl(INADDR_ANY);

	// Binds own address structure to socket
	if (bind(sock, (struct sockaddr *) &socket_name, sizeof(socket_name)) < 0) {
		perror("Couldn't bind the address structure to the socket.");
		exit(EXIT_FAILURE);
	}

	return sock;
}

int read_from_client(int file_des, uint16_t max_line) {
	char buffer[max_line];
	int nbytes;

	nbytes = read(file_des, buffer, sizeof(buffer));
	if (nbytes < 0) {
		perror("Couldn't read from client.");
		exit(EXIT_FAILURE);
	} else if (nbytes == 0)
		// End-of-file
		return -1;
	else {
		fprintf(stderr, "Server: got message: `%s'\n", buffer);
		return 0;
	}
}

void init_sockaddr(struct sockaddr_in *name, const char *hostname, uint16_t port) {
	struct hostent *hostinfo;

	name->sin_family = AF_INET;
	name->sin_port = htons(port);
	hostinfo = gethostbyname(hostname);
	if (hostinfo == NULL) {
		fprintf(stderr, "Unknown host %s.\n", hostname);
		exit(EXIT_FAILURE);
	}
	name->sin_addr = *(struct in_addr *) hostinfo->h_addr_list[0];
}