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TUN-9472: Add virtual DNS service

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Adds a new reserved service to route UDP requests towards the local DNS
resolver.

Closes TUN-9472
This commit is contained in:
Devin Carr
2025-06-27 13:09:29 -07:00
parent b4a98b13fe
commit 9ca8b41cf7
6 changed files with 310 additions and 5 deletions
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6
ingress/origin_udp_proxy.go
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@@ -22,7 +22,7 @@ type UDPOriginService struct {
// UDPOriginProxy provides a UDP dial operation to a requested addr.
type UDPOriginProxy interface {
DialUDP(addr netip.AddrPort) (*net.UDPConn, error)
DialUDP(addr netip.AddrPort) (net.Conn, error)
}
func NewUDPOriginService(reserved map[netip.AddrPort]UDPOriginProxy, logger *zerolog.Logger) *UDPOriginService {
@@ -40,7 +40,7 @@ func (s *UDPOriginService) SetDefaultDialer(dialer UDPOriginProxy) {
}
// DialUDP will perform a dial UDP to the requested addr.
func (s *UDPOriginService) DialUDP(addr netip.AddrPort) (*net.UDPConn, error) {
func (s *UDPOriginService) DialUDP(addr netip.AddrPort) (net.Conn, error) {
// Check to see if any reserved services are available for this addr and call their dialer instead.
if dialer, ok := s.reservedServices[addr]; ok {
return dialer.DialUDP(addr)
@@ -52,7 +52,7 @@ type defaultUDPDialer struct{}
var DefaultUDPDialer UDPOriginProxy = &defaultUDPDialer{}
func (d *defaultUDPDialer) DialUDP(dest netip.AddrPort) (*net.UDPConn, error) {
func (d *defaultUDPDialer) DialUDP(dest netip.AddrPort) (net.Conn, error) {
addr := net.UDPAddrFromAddrPort(dest)
// We use nil as local addr to force runtime to find the best suitable local address IP given the destination