[management] Force routing-peer DNS resolution for reverse-proxy domain targets (#6872)

shared/management/types/network.go

@@ -47,6 +47,10 @@ type NetworkMap struct {
 	ForwardingRules     []*ForwardingRule
 	AuthorizedUsers     map[string]map[string]struct{}
 	EnableSSH           bool
+	// ForceRoutingPeerDNSResolution forces the peer to run/use routing-peer DNS
+	// resolution regardless of the account-global setting, for reverse-proxy
+	// domain targets.
+	ForceRoutingPeerDNSResolution bool
 }
 
 func (nm *NetworkMap) Merge(other *NetworkMap) {
@@ -56,6 +60,7 @@ func (nm *NetworkMap) Merge(other *NetworkMap) {
 	nm.FirewallRules = mergeUnique(nm.FirewallRules, other.FirewallRules)
 	nm.RoutesFirewallRules = mergeUnique(nm.RoutesFirewallRules, other.RoutesFirewallRules)
 	nm.ForwardingRules = mergeUnique(nm.ForwardingRules, other.ForwardingRules)
+	nm.ForceRoutingPeerDNSResolution = nm.ForceRoutingPeerDNSResolution || other.ForceRoutingPeerDNSResolution
 }
 
 type comparableObject[T any] interface {

shared/management/types/networkmap_components.go

@@ -56,6 +56,11 @@ type NetworkMapComponents struct {
 
 	// true when returning an empty-like map (returned instead of nil)
 	empty bool
+
+	// ForceRoutingPeerDNSResolution forces the peer to run/use routing-peer DNS
+	// resolution regardless of the account-global setting, for reverse-proxy
+	// domain targets.
+	ForceRoutingPeerDNSResolution bool
 }
 
 type routeIndexEntry struct {
@@ -190,6 +195,8 @@ func (c *NetworkMapComponents) Calculate(ctx context.Context) *NetworkMap {
 		RoutesFirewallRules: append(networkResourcesFirewallRules, routesFirewallRules...),
 		AuthorizedUsers:     authorizedUsers,
 		EnableSSH:           sshEnabled,
+
+		ForceRoutingPeerDNSResolution: c.ForceRoutingPeerDNSResolution,
 	}
 }