iOS Objective-C get VPN IP programmatically - ios

Question

I use a third-party app to connect a VPN, and we can get the detail information in Settings->VPN->information. How can I get the Assigned IP programmatically in our app by Objective-C?

Answer 1

NSString *address = #"error";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
// retrieve the current interfaces - returns 0 on success
success = getifaddrs(&interfaces);
if (success == 0) {
// Loop through linked list of interfaces
temp_addr = interfaces;
while (temp_addr != NULL) {
if( temp_addr->ifa_addr->sa_family == AF_INET) {
// Check if interface is en0 which is the wifi connection on the iPhone
if ([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:#"utun1"])
{
// Get NSString from C String
address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
NSLog(#"ifaName: %#, Address: %#",[NSString stringWithUTF8String:temp_addr->ifa_name],address);
}
}
temp_addr = temp_addr->ifa_next;
}
}
// Free memory
freeifaddrs(interfaces);
address will have the assigned IP Address

Answer 2

This is working on iOS 14:
- (NSString *)getVPNIPAddress
{
NSString *address = #"error";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
// retrieve the current interfaces - returns 0 on success
success = getifaddrs(&interfaces);
if (success == 0)
{
// Loop through linked list of interfaces
temp_addr = interfaces;
while(temp_addr != NULL)
{
if(temp_addr->ifa_addr->sa_family == AF_INET)
{
NSLog(#"%#",[NSString stringWithUTF8String:temp_addr->ifa_name]);
// Check if interface is en0 which is the wifi connection on the iPhone
if(
[[NSString stringWithUTF8String:temp_addr->ifa_name] containsString:#"tun"] ||
[[NSString stringWithUTF8String:temp_addr->ifa_name] containsString:#"tap"] ||
[[NSString stringWithUTF8String:temp_addr->ifa_name] containsString:#"ipsec"] ||
[[NSString stringWithUTF8String:temp_addr->ifa_name] containsString:#"ppp"]){
// Get NSString from C String
struct sockaddr_in *in = (struct sockaddr_in*) temp_addr->ifa_addr;
address = [NSString stringWithUTF8String:inet_ntoa((in)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
// Free memory
freeifaddrs(interfaces);
return address;
}