Initial commit

2026-04-26 11:27:12 +07:00 · 2026-04-26 11:27:12 +07:00 · 67c955129d
commit 67c955129d
20 changed files with 2203 additions and 0 deletions
--- a/checker/definition.go
+++ b/checker/definition.go
@ -0,0 +1,87 @@
+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 PTR checker.
+func (p *ptrProvider) Definition() *sdk.CheckerDefinition {
+	def := &sdk.CheckerDefinition{
+		ID:      "ptr",
+		Name:    "PTR / Reverse DNS",
+		Version: Version,
+		Availability: sdk.CheckerAvailability{
+			ApplyToService:  true,
+			LimitToServices: []string{"svcs.PTR"},
+		},
+		ObservationKeys: []sdk.ObservationKey{ObservationKeyPTR},
+		Options: sdk.CheckerOptionsDocumentation{
+			UserOpts: []sdk.CheckerOptionDocumentation{
+				{
+					Id:          "requireForwardMatch",
+					Type:        "bool",
+					Label:       "Require forward-confirmed reverse DNS (FCrDNS)",
+					Description: "When enabled, a PTR whose target does not resolve back to the original IP is reported as critical (otherwise as warning). Mail servers and many SSH setups require FCrDNS.",
+					Default:     true,
+				},
+				{
+					Id:          "allowMultiplePTR",
+					Type:        "bool",
+					Label:       "Allow multiple PTR records on the same IP",
+					Description: "When disabled, more than one PTR at the same owner name is reported as warning (RFC 1912 §2.1 recommends a single PTR per IP).",
+					Default:     false,
+				},
+				{
+					Id:          "minTTL",
+					Type:        "uint",
+					Label:       "Minimum PTR TTL (seconds)",
+					Description: "PTR records with a TTL below this threshold are flagged as warning. Very short TTLs degrade resolver cache efficiency.",
+					Default:     float64(300),
+				},
+				{
+					Id:          "flagGenericPTR",
+					Type:        "bool",
+					Label:       "Flag generic-looking PTR hostnames",
+					Description: "When enabled, PTR targets that embed the dotted IP or match common ISP auto-generated patterns are reported as warning.",
+					Default:     true,
+				},
+			},
+			ServiceOpts: []sdk.CheckerOptionDocumentation{
+				{
+					Id:       "service_type",
+					Label:    "Service type",
+					AutoFill: sdk.AutoFillServiceType,
+				},
+				{
+					Id:       "service",
+					Label:    "Service",
+					AutoFill: sdk.AutoFillService,
+				},
+				{
+					Id:       "domain_name",
+					Label:    "Reverse zone",
+					AutoFill: sdk.AutoFillDomainName,
+				},
+				{
+					Id:       "subdomain",
+					Label:    "PTR record",
+					AutoFill: sdk.AutoFillSubdomain,
+				},
+			},
+		},
+		Rules:         Rules(),
+		HasHTMLReport: true,
+		Interval: &sdk.CheckIntervalSpec{
+			Min:     5 * time.Minute,
+			Max:     24 * time.Hour,
+			Default: 1 * time.Hour,
+		},
+	}
+	def.BuildRulesInfo()
+	return def
+}