/** Node type: socket
 *
 * This file implements the socket subtype for nodes.
 *
 * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
 * @copyright 2014, Institute for Automation of Complex Power Systems, EONERC
 */

#ifndef _SOCKET_H_
#define _SOCKET_H_

#include <sys/socket.h>

#include "node.h"

struct socket {
	/** The socket descriptor */
	int sd;
	/** The socket descriptor for an established TCP connection */
	int sd2;
	/** Socket mark for netem, routing and filtering */
	int mark;

	/** Local address of the socket */
	struct sockaddr_storage local;
	/** Remote address of the socket */
	struct sockaddr_storage remote;

	/** Network emulator settings */
	struct netem *netem;

	/* Linked list _per_interface_ */
	struct socket *next;
};

/** Create new socket and connect(), bind(), accept().
 *
 * @param n A pointer to the node.
 * @retval 0 Success. Everything went well.
 * @retval <0 Error. Something went wrong.
 */
int socket_open(struct node *n);

/** Close the socket.
 *
 * @param n A pointer to the node.
 * @retval 0 Success. Everything went well.
 * @retval <0 Error. Something went wrong.
 */
int socket_close(struct node *n);

/** Send a message over a socket connection.
 *
 * @param m A pointer to the message
 * @param n A pointer to the node
 * @retval 0 Success. Everything went well.
 * @retval <0 Error. Something went wrong.
 */
int socket_write(struct node *n, struct msg *m);

/** Receive a message over a socket connection.
 *
 * @param m A pointer to the message
 * @param n A pointer to the node
 * @retval 0 Success. Everything went well.
 * @retval <0 Error. Something went wrong.
 */
int socket_read(struct node *n, struct msg *m);

/** Print details of socket connection
 *
 * @param n A pointer to the node structure
 * @param buf A buffer to be filled.
 * @param len The length of the supplied buffer.
 * @return The length of the address.
 */
int socket_print(struct node *n, char *buf, int len);

/** Generate printable socket address depending on the address family
 *
 * A IPv4 address is formatted as dotted decimals followed by the port/protocol number
 * A link layer address is formatted in hexadecimals digits seperated by colons and the inferface name
 *
 * @param buf A buffer to be filled.
 * @param len The length of the supplied buffer.
 * @param sa A pointer to the socket address.
 * @return The length of the address.
 */
int socket_print_addr(char *buf, int len, struct sockaddr *sa);

/** Parse a socket address depending on the address family
 *
 * A IPv4 address has the follwing format: [hostname/ip]:[port/protocol]
 * A link layer address has the following format: [mac]%[interface]:[ethertype]
 *
 * @todo Add support for autodetection of address type
 *
 * @param str A string specifiying the socket address. See description for allowed formats.
 * @param sa A pointer to the resolved address
 * @param type Specifies the address type in which the addr is given
 * @param flags Flags for getaddrinfo(2)
 * @retval 0 Success. Everything went well.
 * @retval <0 Error. Something went wrong.
 */
int socket_parse_addr(const char *str, struct sockaddr *sa, enum node_type type, int flags);

#endif /* _SOCKET_H_ */