diff --git a/embassy-net/src/lib.rs b/embassy-net/src/lib.rs index 9f83cb4e..23ec3326 100644 --- a/embassy-net/src/lib.rs +++ b/embassy-net/src/lib.rs @@ -444,14 +444,12 @@ impl Inner { debug!(" DNS server {}: {}", i, s); } + self.static_v4 = Some(config); + #[cfg(feature = "dns")] { - let socket = s.sockets.get_mut::(self.dns_socket); - let servers: Vec = config.dns_servers.iter().map(|c| IpAddress::Ipv4(*c)).collect(); - socket.update_servers(&servers[..]); + self.update_dns_servers(s) } - - self.static_v4 = Some(config) } /// Replaces the current IPv6 static configuration with a newly supplied config. @@ -485,14 +483,47 @@ impl Inner { debug!(" DNS server {}: {}", i, s); } + self.static_v6 = Some(config); + #[cfg(feature = "dns")] { - let socket = s.sockets.get_mut::(self.dns_socket); - let servers: Vec = config.dns_servers.iter().map(|c| IpAddress::Ipv6(*c)).collect(); - socket.update_servers(&servers[..]); + self.update_dns_servers(s) + } + } + + #[cfg(feature = "dns")] + fn update_dns_servers(&mut self, s: &mut SocketStack) { + let socket = s.sockets.get_mut::(self.dns_socket); + + let servers_v4; + #[cfg(feature = "proto-ipv4")] + { + servers_v4 = self + .static_v4 + .iter() + .flat_map(|cfg| cfg.dns_servers.iter().map(|c| IpAddress::Ipv4(*c))); + }; + #[cfg(not(feature = "proto-ipv4"))] + { + servers_v4 = core::iter::empty(); } - self.static_v6 = Some(config) + let servers_v6; + #[cfg(feature = "proto-ipv6")] + { + servers_v6 = self + .static_v6 + .iter() + .flat_map(|cfg| cfg.dns_servers.iter().map(|c| IpAddress::Ipv6(*c))); + } + #[cfg(not(feature = "proto-ipv6"))] + { + servers_v6 = core::iter::empty(); + } + + // Prefer the v6 DNS servers over the v4 servers + let servers: Vec = servers_v6.chain(servers_v4).collect(); + socket.update_servers(&servers[..]); } #[cfg(feature = "dhcpv4")]