How do you get the current DNS servers for Android?

Question

I\'m trying to get hold of the addresses to the currently used DNS servers in my application, either I\'m connected thru Wifi or mobile. The DhcpInfo object should provide t

Answer 1

A native alternative is:

char dns1[PROP_VALUE_MAX];
__system_property_get("net.dns1", dns1);

Or better yet for a comprehensive list:

for (i = 1; i <= MAX_DNS_PROPERTIES; i++) {
    char prop_name[PROP_NAME_MAX];
    snprintf(prop_name, sizeof(prop_name), "net.dns%d", i);
    __system_property_get(prop_name, dns);
}

There are a few advantages to doing it this way:

1. runDHCP is really slow. It can take as long as 5-10 seconds. This can cause a major hang when used incorrectly.
2. runDCHP doesn't seem to work for 3G/4G.
3. Since runDCHP is a hidden API it is subject to change. In fact it did change in ICS. In ICS it takes a new DhcpInfoInternal, so you'll have to create two different to support all phones.