#ifndef EASYSOCK_H_
#define EASYSOCK_H_

#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>


/* This function takes:
a layer 3 - network layer - integer, which must be '4' for IPv4
and 6 for IPv6; and
a layer 4 - transport layer - character, which must be 'T' for
TCP or 'U' for UDP. 

It returns the created socket, or -1 if the socket creation failed.*/

int create_socket(int network, char transport);


/* This function fills in the sockaddr struct 'dest' based on the given information.
'network' is an integer that contains '4' for IPv4 or '6' for IPv6;
'address' is the address that is filled into the struct;
port is self-explanatory;
and dest is a pointer to the sockaddr struct that will be filled in. 

The function returns with -202 if the network parameter contained neither '4'
nor '6'. */

int create_addr(int network, char* address, int port,struct sockaddr* dest);



/* This function utilizes the above two functions; it creates the socket and
_binds_ the addresses. It is used for local sockets (server sockets). Parameters are
same as above. 

It prints the error returned by 'bind' if something went wrong, and returns ( -1 * errno ).*/

int create_local (int network, char transport, char* address, int port,struct sockaddr* addr_struct);


/* This function utilizes the same functions as 'create_local' but _connects_ to the
requested address. It is used for remote sockets (client sockets). The paramters are same
as above. This function needs an empty 'sockaddr *' structure passed to it, which it will fill.

If something goes wrong, this function returns with ( -1 * errno ). */

int create_remote (int network,char transport,char* address,int port,struct sockaddr* remote_addr_struct);

/* check_ip_ver - This function checks if the given string is an IPv4 address (returns 4), 
IPv6 address (returns 6) or neither (returns -1). */

int check_ip_ver(char* address);

/* int_to_inet - Takes an int value (4 for IPv4, 6 for IPv6) and returns AF_INET or
AF_INET6 respectively. */

int int_to_inet(int network);

/* char_to_socktype - Takes a character that represents a transport-layer protocol
(currently only supports 'T' for TCP or 'U' for UDP - it returns -250 if 
the given characters is neither of these) and return the appropriate SOCKTYPE value. */

int char_to_socktype(char transport);

/* inet_to_int - Takes an int value that corresponds to AF_INET or AF_INET6,
and returns the appropriate int value. */
int inet_to_int(int af_type);


#endif