package xds import ( "fmt" "regexp" envoycore "github.com/envoyproxy/go-control-plane/envoy/api/v2/core" "github.com/hashicorp/go-version" ) var ( // minSupportedVersion is the oldest mainline version we support. This should always be // the zero'th point release of the last element of proxysupport.EnvoyVersions. minSupportedVersion = version.Must(version.NewVersion("1.12.0")) ) type supportedProxyFeatures struct { // add version dependent feature flags here } func determineSupportedProxyFeatures(node *envoycore.Node) (supportedProxyFeatures, error) { version := determineEnvoyVersionFromNode(node) return determineSupportedProxyFeaturesFromVersion(version) } func determineSupportedProxyFeaturesFromString(vs string) (supportedProxyFeatures, error) { version := version.Must(version.NewVersion(vs)) return determineSupportedProxyFeaturesFromVersion(version) } func determineSupportedProxyFeaturesFromVersion(version *version.Version) (supportedProxyFeatures, error) { if version == nil { // This would happen on either extremely old builds OR perhaps on // custom builds. Should we error? return supportedProxyFeatures{}, nil } if version.LessThan(minSupportedVersion) { return supportedProxyFeatures{}, fmt.Errorf("Envoy %s is too old and is not supported by Consul", version) } return supportedProxyFeatures{}, nil } // example: 1580db37e9a97c37e410bad0e1507ae1a0fd9e77/1.12.4/Clean/RELEASE/BoringSSL var buildVersionPattern = regexp.MustCompile(`^[a-f0-9]{40}/([^/]+)/Clean/RELEASE/BoringSSL$`) func determineEnvoyVersionFromNode(node *envoycore.Node) *version.Version { if node == nil { return nil } if node.UserAgentVersionType == nil { if node.BuildVersion == "" { return nil } // Must be an older pre-1.13 envoy m := buildVersionPattern.FindStringSubmatch(node.BuildVersion) if m == nil { return nil } return version.Must(version.NewVersion(m[1])) } if node.UserAgentName != "envoy" { return nil } bv, ok := node.UserAgentVersionType.(*envoycore.Node_UserAgentBuildVersion) if !ok { // NOTE: we could sniff for *envoycore.Node_UserAgentVersion and do more regex but official builds don't have this problem. return nil } if bv.UserAgentBuildVersion == nil { return nil } v := bv.UserAgentBuildVersion.Version return version.Must(version.NewVersion( fmt.Sprintf("%d.%d.%d", v.GetMajorNumber(), v.GetMinorNumber(), v.GetPatch(), ), )) }