When I use the following code to try to obtain an IP address, some phones fail to get the IP address.
+ (NSDictionary *)getWLANAddressInfo {
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
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:@"en0"]) {
// Get NSString from C String
NSString *address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
NSString *dstaddr = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_dstaddr)->sin_addr)];
[dict setObject:address forKey:@"ip"];
[dict setObject:dstaddr forKey:@"dst"];
}
}
temp_addr = temp_addr->ifa_next;
}
}
// Free memory
freeifaddrs(interfaces);
return dict;
}
The affected phones have iOS versions 16.3.1 and 16.4, Has anyone else encountered the same issue?
What's causing this issue and how can I work around it?
