open-consul/agent/connect/sni.go

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package connect
import (
"fmt"
"strings"
"github.com/hashicorp/consul/agent/structs"
)
const (
internal = "internal"
version = "v1"
internalVersion = internal + "-" + version
)
func UpstreamSNI(u *structs.Upstream, subset string, dc string, trustDomain string) string {
if u.Datacenter != "" {
dc = u.Datacenter
}
if u.DestinationType == structs.UpstreamDestTypePreparedQuery {
return QuerySNI(u.DestinationName, dc, trustDomain)
}
// TODO(peering): account for peer here?
return ServiceSNI(u.DestinationName, subset, u.DestinationNamespace, u.DestinationPartition, dc, trustDomain)
}
func GatewaySNI(dc string, partition, trustDomain string) string {
if partition == "" {
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// TODO(partitions) Make default available in OSS as a constant for uses like this one
partition = "default"
}
switch partition {
case "default":
return dotJoin(dc, internal, trustDomain)
default:
return dotJoin(partition, dc, internalVersion, trustDomain)
}
}
func ServiceSNI(service string, subset string, namespace string, partition string, datacenter string, trustDomain string) string {
if namespace == "" {
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namespace = structs.IntentionDefaultNamespace
}
if partition == "" {
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// TODO(partitions) Make default available in OSS as a constant for uses like this one
partition = "default"
}
switch partition {
case "default":
if subset == "" {
return dotJoin(service, namespace, datacenter, internal, trustDomain)
} else {
return dotJoin(subset, service, namespace, datacenter, internal, trustDomain)
}
default:
if subset == "" {
return dotJoin(service, namespace, partition, datacenter, internalVersion, trustDomain)
} else {
return dotJoin(subset, service, namespace, partition, datacenter, internalVersion, trustDomain)
}
}
}
func dotJoin(parts ...string) string {
return strings.Join(parts, ".")
}
func QuerySNI(service string, datacenter string, trustDomain string) string {
return fmt.Sprintf("%s.default.%s.query.%s", service, datacenter, trustDomain)
}
func TargetSNI(target *structs.DiscoveryTarget, trustDomain string) string {
return ServiceSNI(target.Service, target.ServiceSubset, target.Namespace, target.Partition, target.Datacenter, trustDomain)
}