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dns_generator.go
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dns_generator.go
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package generator
import (
"context"
core_xds "github.com/kumahq/kuma/pkg/core/xds"
util_net "github.com/kumahq/kuma/pkg/util/net"
xds_context "github.com/kumahq/kuma/pkg/xds/context"
envoy_listeners "github.com/kumahq/kuma/pkg/xds/envoy/listeners"
"github.com/kumahq/kuma/pkg/xds/envoy/names"
)
// OriginDNS is a marker to indicate by which ProxyGenerator resources were generated.
const OriginDNS = "dns"
type DNSGenerator struct{}
func (g DNSGenerator) Generate(ctx context.Context, xdsCtx xds_context.Context, proxy *core_xds.Proxy) (*core_xds.ResourceSet, error) {
dnsPort := proxy.Metadata.GetDNSPort()
emptyDnsPort := proxy.Metadata.GetEmptyDNSPort()
if dnsPort == 0 || emptyDnsPort == 0 {
return nil, nil
}
if proxy.Dataplane.Spec.GetNetworking().GetTransparentProxying() == nil {
return nil, nil // DNS only makes sense when transparent proxy is used
}
ipV6Enabled := proxy.Dataplane.Spec.GetNetworking().GetTransparentProxying().GetRedirectPortInboundV6() != 0
outboundIPs := map[string]bool{}
for _, outbound := range proxy.Dataplane.Spec.Networking.GetOutboundInterfaces() {
outboundIPs[outbound.DataplaneIP] = true
}
vips := map[string][]string{}
for _, dnsOutbound := range xdsCtx.Mesh.VIPDomains {
if !outboundIPs[dnsOutbound.Address] {
continue // if there is no outbound for given address, there is no point of providing DNS resolver
}
addresses := []string{dnsOutbound.Address}
v6 := util_net.ToV6(dnsOutbound.Address)
if v6 != dnsOutbound.Address && ipV6Enabled {
addresses = append(addresses, v6)
}
for _, domain := range dnsOutbound.Domains {
vips[domain] = addresses
}
}
listener, err := envoy_listeners.NewInboundListenerBuilder(proxy.APIVersion, "127.0.0.1", dnsPort, core_xds.SocketAddressProtocolUDP).
WithOverwriteName(names.GetDNSListenerName()).
Configure(envoy_listeners.DNS(vips, emptyDnsPort, proxy.Metadata.Version.Envoy)).
Build()
if err != nil {
return nil, err
}
resources := core_xds.NewResourceSet()
resources.Add(&core_xds.Resource{
Name: names.GetDNSListenerName(),
Resource: listener,
Origin: OriginDNS,
})
return resources, nil
}