Added easysock files
parent
b5a8fd599d
commit
24cf8a9a78
@ -0,0 +1,170 @@
|
||||
#include "easysock.h"
|
||||
|
||||
|
||||
int create_socket(int network, char transport) {
|
||||
int domain;
|
||||
int type;
|
||||
|
||||
if (network == 4) {
|
||||
domain = AF_INET;
|
||||
} else if (network == 6) {
|
||||
domain = AF_INET6;
|
||||
} else {
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (transport == 'T') {
|
||||
type = SOCK_STREAM;
|
||||
} else if (transport == 'U') {
|
||||
type = SOCK_DGRAM;
|
||||
} else {
|
||||
return -1;
|
||||
}
|
||||
|
||||
int newSock = socket(domain,type,0);
|
||||
return newSock;
|
||||
}
|
||||
|
||||
|
||||
int create_addr(int network, char* address, int port,struct sockaddr* dest) {
|
||||
if (network == 4) {
|
||||
struct sockaddr_in listen_address;
|
||||
|
||||
listen_address.sin_family = AF_INET;
|
||||
listen_address.sin_port = htons(port);
|
||||
inet_pton(AF_INET,address,&listen_address.sin_addr);
|
||||
memcpy(dest,&listen_address,sizeof(listen_address));
|
||||
return 0;
|
||||
|
||||
} else if (network == 6) {
|
||||
struct sockaddr_in6 listen_ipv6;
|
||||
listen_ipv6.sin6_family = AF_INET6;
|
||||
listen_ipv6.sin6_port = htons(port);
|
||||
inet_pton(AF_INET6,address,&listen_ipv6.sin6_addr);
|
||||
memcpy(dest,&listen_ipv6,sizeof(listen_ipv6));
|
||||
return 0;
|
||||
|
||||
} else {
|
||||
return -202;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
int create_local (int network, char transport, char* address, int port,struct sockaddr* addr_struct) {
|
||||
int socket = create_socket(network,transport);
|
||||
if (socket < 0) {
|
||||
return (-1 * errno);
|
||||
}
|
||||
create_addr(network,address,port,addr_struct);
|
||||
int addrlen;
|
||||
if (network == 4) {
|
||||
addrlen = sizeof(struct sockaddr_in);
|
||||
} else if (network == 6) {
|
||||
addrlen = sizeof(struct sockaddr_in6);
|
||||
} else {
|
||||
return -202;
|
||||
}
|
||||
|
||||
/* The value of addrlen should be the size of the 'sockaddr'.
|
||||
This should be set to the size of 'sockaddr_in' for IPv4, and 'sockaddr_in6' for IPv6.
|
||||
See https://stackoverflow.com/questions/73707162/socket-bind-failed-with-invalid-argument-error-for-program-running-on-macos */
|
||||
|
||||
int i = bind (socket,addr_struct,(socklen_t)addrlen);
|
||||
if (i < 0) {
|
||||
return (-1 * errno);
|
||||
}
|
||||
return socket;
|
||||
}
|
||||
|
||||
int create_remote (int network,char transport,char* address,int port,struct sockaddr* remote_addr_struct) {
|
||||
|
||||
struct addrinfo hints; /* Used to tell getaddrinfo what kind of address we want */
|
||||
struct addrinfo* results; /* Used by getaddrinfo to store the addresses */
|
||||
|
||||
|
||||
if (check_ip_ver(address) < 0) { /* If the address is a domain name */
|
||||
int err_code;
|
||||
char* port_str = (char *)malloc(10 * sizeof(char));
|
||||
|
||||
sprintf(port_str,"%d",port); /* getaddrinfo expects a string for its port */
|
||||
|
||||
|
||||
memset(&hints,'\0',sizeof(hints));
|
||||
hints.ai_socktype = char_to_socktype(transport);
|
||||
|
||||
err_code = getaddrinfo(address,port_str,&hints,&results);
|
||||
if (err_code != 0) {
|
||||
return (-1 * err_code);
|
||||
}
|
||||
remote_addr_struct = results->ai_addr;
|
||||
network = inet_to_int(results->ai_family);
|
||||
} else {
|
||||
create_addr(network,address,port,remote_addr_struct);
|
||||
}
|
||||
|
||||
int socket = create_socket(network,transport);
|
||||
if (socket < 0) {
|
||||
return (-1 * errno);
|
||||
}
|
||||
|
||||
int addrlen;
|
||||
if (network == 4) {
|
||||
addrlen = sizeof(struct sockaddr_in);
|
||||
} else if (network == 6) {
|
||||
addrlen = sizeof(struct sockaddr_in6);
|
||||
} else {
|
||||
return (-202);
|
||||
}
|
||||
|
||||
/* The value of addrlen should be the size of the 'sockaddr'.
|
||||
This should be set to the size of 'sockaddr_in' for IPv4, and 'sockaddr_in6' for IPv6.
|
||||
See https://stackoverflow.com/questions/73707162/socket-bind-failed-with-invalid-argument-error-for-program-running-on-macos */
|
||||
|
||||
int i = connect(socket,remote_addr_struct,(socklen_t)addrlen);
|
||||
if (i < 0) {
|
||||
return (-1 * errno);
|
||||
}
|
||||
return socket;
|
||||
}
|
||||
|
||||
|
||||
int check_ip_ver(char* address) {
|
||||
char buffer[16]; /* 16 chars - 128 bits - is enough to hold an ipv6 address */
|
||||
if (inet_pton(AF_INET,address,buffer) == 1) {
|
||||
return 4;
|
||||
} else if (inet_pton(AF_INET6,address,buffer) == 1) {
|
||||
return 6;
|
||||
} else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
int int_to_inet(int network) {
|
||||
if (network == 4) {
|
||||
return AF_INET;
|
||||
} else if (network == 6) {
|
||||
return AF_INET6;
|
||||
} else {
|
||||
return -202;
|
||||
}
|
||||
}
|
||||
|
||||
int inet_to_int(int af_type) {
|
||||
if (af_type == AF_INET) {
|
||||
return 4;
|
||||
} else if (af_type == AF_INET6) {
|
||||
return 6;
|
||||
} else {
|
||||
return -207;
|
||||
}
|
||||
}
|
||||
|
||||
int char_to_socktype(char transport) {
|
||||
if (transport == 'T') {
|
||||
return SOCK_STREAM;
|
||||
} else if (transport == 'U') {
|
||||
return SOCK_DGRAM;
|
||||
} else {
|
||||
return -250;
|
||||
}
|
||||
}
|
@ -0,0 +1,76 @@
|
||||
#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
|
Loading…
Reference in New Issue