/*
 * SPDX-FileCopyrightText: 2019 Helmut Pozimski <helmut@pozimski.eu>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 */

#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

/*
 * Function: tcpserver_start
 * ----------------------------
 *    Creates a socket and starts to listen on a specified port and address 
 * 
 * address: the IPv4 address to listen to
 * port: the TCP port to bind to
 *
 * returns: the socket used for the connection, -1 on failures
 */
int tcpserver_start(const char *address, uint16_t port) {
	struct sockaddr_in server;
	int sock;
	server.sin_family = AF_INET;
	server.sin_port = htons(port);
	inet_pton(AF_INET ,address, &server.sin_addr.s_addr);
	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		close(sock);
		return -1;
	}
	if (bind(sock, (struct sockaddr*) &server, sizeof(server)) < 0 ) {
		close(sock);
		return -1;
	}
	if (listen(sock, 1) != 0) {
		close(sock);
		return -1;
	}
	return sock;
}

/*
 * Function: tcpserver_stop
 * ------------------------
 *     Stops the tcp server by closing the socket
 *
 * sock: the socket used for the connection
 *
 */
void tcpserver_stop(int sock) {
	shutdown(sock, SHUT_RDWR);
	close(sock);
}