Fixed IPv6 bug (sockaddr size too small) when binding socket to address

TODO.txt

@@ -8,4 +8,6 @@
 
 3. Add support for configuration files, which can be specified via a command-line arg
 
-4. Fix Makefile - Doesn't recompile if source files have changed, only if .o files have.
+---SHOULD BE DONE---- 4. Fix Makefile - Doesn't recompile if source files have changed, only if .o files have.
+
+5. Check IPv6 support for remote socket

easysock.c

@@ -51,11 +51,23 @@ void create_addr(int network, char* address, int port,struct sockaddr* dest) {
 
 int create_local (int network, char transport, char* address, int port,struct sockaddr* addr_struct) {
 	int socket = create_socket(network,transport);
-	if (socket == -1) {
-		exit(-1);
+	if (socket < 0) {
+		printf("Something went wrong creating the socket: %s\n",strerror(errno));
 	}
 	create_addr(network,address,port,addr_struct);
-	int addrlen = sizeof(*addr_struct);
+	int addrlen;
+	if (network == 4) {
+		addrlen = sizeof(struct sockaddr_in);
+	} else if (network == 6) {
+		addrlen = sizeof(struct sockaddr_in6);
+	} else {
+		exit(-7);
+	}
+
+	/* 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) {
 		printf("Something went wrong: %s\n",strerror(errno));
@@ -73,7 +85,19 @@ int create_remote (int network,char transport,char* address,int port) {
         }
 	struct sockaddr remote_addr_struct;
         create_addr(network,address,port,&remote_addr_struct);
-        int addrlen = sizeof(remote_addr_struct);
+        int addrlen;
+	if (network == 4) {
+		addrlen = sizeof(struct sockaddr_in);
+	} else if (network == 6) {
+		addrlen = sizeof(struct sockaddr_in6);
+	} else {
+		exit(-7);
+	}
+
+	/* 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) {
 		printf("Something went wrong: %s\n",strerror(errno));

main.c

@@ -40,7 +40,7 @@ int main(int argc,char* argv[]) {
 	int preferred_remote_network = check_ip_ver(remote_addr);
 	printf("Using %d for local\nUsing %d for remote\n",preferred_local_network,preferred_remote_network);
 	
-	if ((preferred_local_network == -1) && (preferred_remote_network == -1)) {
+	if ((preferred_local_network == -1) || (preferred_remote_network == -1)) {
 		exit(-7);
 	}