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174 lines
4.1 KiB
C
174 lines
4.1 KiB
C
5 months ago
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//go:build exclude
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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 = 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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