This effectively means that doggo @2001:DB8::53 example.org works just like we know it from dig(1). This already works for IPv4 because url.Parse accepts a literal IPv4 address, but not a literal IPv6 address (due to parsing ambiguities with strings that look like an IPv4 address I guess).
This is implemented by checking if the nameserver argument is a valid IP if the URL validation failed. If that's the case, ns is returned directly with the [2001:DB8::53]:53 as address (from net.JoinHostPort with the default DNS port) and UDP as protocol (also the default if not specified).
mr-karan
commented
1 year ago
This effectively means that
doggo @2001:DB8::53 example.orgworks just like we know it fromdig(1). This already works for IPv4 becauseurl.Parseaccepts a literal IPv4 address, but not a literal IPv6 address (due to parsing ambiguities with strings that look like an IPv4 address I guess).This is implemented by checking if the nameserver argument is a valid IP if the URL validation failed. If that's the case,
nsis returned directly with the[2001:DB8::53]:53as address (fromnet.JoinHostPortwith the default DNS port) and UDP as protocol (also the default if not specified).