plugin/view: server_ip() fails to compare against local address for UDP packets

What happened:

When CoreDNS is configured to listed on the [::] wildcard, view filter that uses serverip() will not match against local IP for UDP packets. This happens because ResponseWriter.LocalAddr() calls PacketConn.LocalAddr() instead of using PacketControl.

What you expected to happen:

serverip() should match against actual local address that received the packet.

How to reproduce it (as minimally and precisely as possible):

. {
    view VIEW {
        expr server_ip() == '<ip>'
    }
    log . "IP MATCHED"
}
. {
    view VIEW {
        expr server_ip() == '[::]'
    }
    log . "WILDCARD MATCHED"
}
. {
    log . "NOT MATCHED"
}

Then make DNS query over UDP via .

Anything else we need to know?:

plugin/log's {local} is also affected.

Environment:

• the version of CoreDNS: 1.14.7