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#ifndef EASYSOCK_H_
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#define EASYSOCK_H_
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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/* This function takes:
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a layer 3 - network layer - integer, which must be '4' for IPv4
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and 6 for IPv6; and
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a layer 4 - transport layer - character, which must be 'T' for
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TCP or 'U' for UDP.
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It returns the created socket, or -1 if the socket creation failed.*/
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int create_socket(int network, char transport);
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/* This function fills in the sockaddr struct 'dest' based on the given information.
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'network' is an integer that contains '4' for IPv4 or '6' for IPv6;
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'address' is the address that is filled into the struct;
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port is self-explanatory;
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and dest is a pointer to the sockaddr struct that will be filled in.
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The function exits with error code 202 if the network parameter contained neither '4'
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nor '6'. */
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void create_addr(int network, char* address, int port,struct sockaddr* dest);
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/* This function utilizes the above two functions; it creates the socket and
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_binds_ the addresses. It is used for local sockets (server sockets). Parameters are
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same as above.
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It prints the error returned by 'bind' if something went wrong, and exits with errno.*/
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int create_local (int network, char transport, char* address, int port,struct sockaddr* addr_struct);
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/* This function utilizes the same functions as 'create_local' but _connects_ to the
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requested address. It is used for remote sockets (client sockets). The paramters are same
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as above. This function needs an empty 'sockaddr *' structure passed to it, which it will fill.
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It prints the error returned by 'connect' if something went wrong, and exits with errno.*/
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int create_remote (int network,char transport,char* address,int port,struct sockaddr* remote_addr_struct);
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/* check_ip_ver - This function checks if the given string is an IPv4 address (returns 4),
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IPv6 address (returns 6) or neither (returns -1). */
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int check_ip_ver(char* address);
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/* int_to_inet - Takes an int value (4 for IPv4, 6 for IPv6) and returns AF_INET or
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AF_INET6 respectively. */
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int int_to_inet(int network);
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/* char_to_socktype - Takes a character that represents a transport-layer protocol
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(currently only supports 'T' for TCP or 'U' for UDP - exits with error code 250 if
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the given characters is neither of these) and return the appropriate SOCKTYPE value. */
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int char_to_socktype(char transport);
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/* inet_to_int - Takes an int value that corresponds to AF_INET or AF_INET6,
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and returns the appropriate int value. */
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int inet_to_int(int af_type);
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#endif
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