Added easysock files
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b5a8fd599d
commit
24cf8a9a78
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#include "easysock.h"
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int create_socket(int network, char transport) {
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int domain;
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int type;
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if (network == 4) {
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domain = AF_INET;
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} else if (network == 6) {
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domain = AF_INET6;
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} else {
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return -1;
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}
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if (transport == 'T') {
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type = SOCK_STREAM;
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} else if (transport == 'U') {
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type = SOCK_DGRAM;
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} else {
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return -1;
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}
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int newSock = socket(domain,type,0);
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return newSock;
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}
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int create_addr(int network, char* address, int port,struct sockaddr* dest) {
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if (network == 4) {
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struct sockaddr_in listen_address;
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listen_address.sin_family = AF_INET;
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listen_address.sin_port = htons(port);
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inet_pton(AF_INET,address,&listen_address.sin_addr);
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memcpy(dest,&listen_address,sizeof(listen_address));
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return 0;
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} else if (network == 6) {
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struct sockaddr_in6 listen_ipv6;
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listen_ipv6.sin6_family = AF_INET6;
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listen_ipv6.sin6_port = htons(port);
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inet_pton(AF_INET6,address,&listen_ipv6.sin6_addr);
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memcpy(dest,&listen_ipv6,sizeof(listen_ipv6));
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return 0;
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} else {
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return -202;
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}
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}
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int create_local (int network, char transport, char* address, int port,struct sockaddr* addr_struct) {
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int socket = create_socket(network,transport);
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if (socket < 0) {
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return (-1 * errno);
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}
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create_addr(network,address,port,addr_struct);
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int addrlen;
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if (network == 4) {
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addrlen = sizeof(struct sockaddr_in);
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} else if (network == 6) {
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addrlen = sizeof(struct sockaddr_in6);
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} else {
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return -202;
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}
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/* The value of addrlen should be the size of the 'sockaddr'.
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This should be set to the size of 'sockaddr_in' for IPv4, and 'sockaddr_in6' for IPv6.
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See https://stackoverflow.com/questions/73707162/socket-bind-failed-with-invalid-argument-error-for-program-running-on-macos */
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int i = bind (socket,addr_struct,(socklen_t)addrlen);
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if (i < 0) {
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return (-1 * errno);
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}
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return socket;
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}
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int create_remote (int network,char transport,char* address,int port,struct sockaddr* remote_addr_struct) {
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struct addrinfo hints; /* Used to tell getaddrinfo what kind of address we want */
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struct addrinfo* results; /* Used by getaddrinfo to store the addresses */
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if (check_ip_ver(address) < 0) { /* If the address is a domain name */
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int err_code;
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char* port_str = (char *)malloc(10 * sizeof(char));
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sprintf(port_str,"%d",port); /* getaddrinfo expects a string for its port */
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memset(&hints,'\0',sizeof(hints));
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hints.ai_socktype = char_to_socktype(transport);
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err_code = getaddrinfo(address,port_str,&hints,&results);
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if (err_code != 0) {
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return (-1 * err_code);
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}
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remote_addr_struct = results->ai_addr;
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network = inet_to_int(results->ai_family);
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} else {
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create_addr(network,address,port,remote_addr_struct);
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}
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int socket = create_socket(network,transport);
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if (socket < 0) {
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return (-1 * errno);
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}
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int addrlen;
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if (network == 4) {
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addrlen = sizeof(struct sockaddr_in);
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} else if (network == 6) {
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addrlen = sizeof(struct sockaddr_in6);
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} else {
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return (-202);
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}
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/* The value of addrlen should be the size of the 'sockaddr'.
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This should be set to the size of 'sockaddr_in' for IPv4, and 'sockaddr_in6' for IPv6.
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See https://stackoverflow.com/questions/73707162/socket-bind-failed-with-invalid-argument-error-for-program-running-on-macos */
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int i = connect(socket,remote_addr_struct,(socklen_t)addrlen);
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if (i < 0) {
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return (-1 * errno);
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}
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return socket;
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}
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int check_ip_ver(char* address) {
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char buffer[16]; /* 16 chars - 128 bits - is enough to hold an ipv6 address */
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if (inet_pton(AF_INET,address,buffer) == 1) {
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return 4;
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} else if (inet_pton(AF_INET6,address,buffer) == 1) {
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return 6;
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} else {
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return -1;
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}
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}
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int int_to_inet(int network) {
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if (network == 4) {
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return AF_INET;
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} else if (network == 6) {
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return AF_INET6;
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} else {
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return -202;
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}
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}
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int inet_to_int(int af_type) {
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if (af_type == AF_INET) {
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return 4;
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} else if (af_type == AF_INET6) {
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return 6;
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} else {
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return -207;
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}
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}
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int char_to_socktype(char transport) {
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if (transport == 'T') {
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return SOCK_STREAM;
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} else if (transport == 'U') {
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return SOCK_DGRAM;
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} else {
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return -250;
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}
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}
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@ -0,0 +1,76 @@
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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 returns with -202 if the network parameter contained neither '4'
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nor '6'. */
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int 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 returns ( -1 * 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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If something goes wrong, this function returns with ( -1 * 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 - it returns -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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