Initial commit

2026-04-23 19:37:14 +07:00 · 2026-04-23 19:37:14 +07:00 · 2d9a821a65
commit 2d9a821a65
18 changed files with 1821 additions and 0 deletions
--- a/checker/definition.go
+++ b/checker/definition.go
@ -0,0 +1,103 @@
+package checker
+
+import (
+	"time"
+
+	sdk "git.happydns.org/checker-sdk-go/checker"
+)
+
+// Version is the checker version reported in CheckerDefinition.Version.
+var Version = "built-in"
+
+// Definition returns the CheckerDefinition for the alias checker.
+func Definition() *sdk.CheckerDefinition {
+	def := &sdk.CheckerDefinition{
+		ID:      "alias",
+		Name:    "CNAME / DNAME / ALIAS chain",
+		Version: Version,
+		Availability: sdk.CheckerAvailability{
+			ApplyToService: true,
+			ApplyToDomain:  true,
+			ApplyToZone:    true,
+			LimitToServices: []string{
+				"svcs.CNAME",
+				"svcs.SpecialCNAME",
+			},
+		},
+		ObservationKeys: []sdk.ObservationKey{ObservationKeyAlias},
+		Options: sdk.CheckerOptionsDocumentation{
+			UserOpts: []sdk.CheckerOptionDocumentation{
+				{
+					Id:          "maxChainLength",
+					Type:        "uint",
+					Label:       "Maximum chain length",
+					Description: "Above this number of hops the chain is reported as critical. Most resolvers give up around 8–16.",
+					Default:     float64(8),
+				},
+				{
+					Id:          "minTargetTTL",
+					Type:        "uint",
+					Label:       "Minimum TTL (seconds)",
+					Description: "Hops with a TTL below this threshold are flagged as a warning. Very short TTLs degrade cache performance.",
+					Default:     float64(60),
+				},
+				{
+					Id:          "requireResolvableTarget",
+					Type:        "bool",
+					Label:       "Require resolvable target",
+					Description: "When enabled, a chain whose final target returns no A/AAAA is reported as critical (otherwise a warning).",
+					Default:     true,
+				},
+				{
+					Id:          "allowApexCNAME",
+					Type:        "bool",
+					Label:       "Allow CNAME at apex",
+					Description: "When enabled, a CNAME at a zone apex is only reported as warning. RFC 1912 forbids this, so leaving it off is strongly recommended.",
+					Default:     false,
+				},
+				{
+					Id:          "recognizeApexFlattening",
+					Type:        "bool",
+					Label:       "Recognize ALIAS/ANAME flattening",
+					Description: "When enabled, providers that serve A/AAAA at the apex (ALIAS/ANAME pseudo-records) are reported as informational instead of a coexistence violation.",
+					Default:     true,
+				},
+			},
+			DomainOpts: []sdk.CheckerOptionDocumentation{
+				{
+					Id:       "domain_name",
+					Label:    "Parent domain name",
+					AutoFill: sdk.AutoFillDomainName,
+				},
+				{
+					Id:       "subdomain",
+					Label:    "Subdomain",
+					AutoFill: sdk.AutoFillSubdomain,
+				},
+			},
+			ServiceOpts: []sdk.CheckerOptionDocumentation{
+				{
+					Id:       "service_type",
+					Label:    "Service type",
+					AutoFill: sdk.AutoFillServiceType,
+				},
+				{
+					Id:       "service",
+					Label:    "Service",
+					AutoFill: sdk.AutoFillService,
+				},
+			},
+		},
+		Rules: []sdk.CheckRule{
+			Rule(),
+		},
+		HasHTMLReport: true,
+		Interval: &sdk.CheckIntervalSpec{
+			Min:     5 * time.Minute,
+			Max:     24 * time.Hour,
+			Default: 1 * time.Hour,
+		},
+	}
+	def.BuildRulesInfo()
+	return def
+}