53 lines
1.5 KiB
Go
53 lines
1.5 KiB
Go
package checker
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import (
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"context"
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"fmt"
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sdk "git.happydns.org/checker-sdk-go/checker"
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)
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// noRecursionRule flags authoritative nameservers that still advertise
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// recursion to the public (RA bit set), a classic open-resolver posture.
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type noRecursionRule struct{}
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func (r *noRecursionRule) Name() string { return "ns_no_recursion" }
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func (r *noRecursionRule) Description() string {
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return "Verifies that authoritative nameservers do not advertise recursion (RA bit unset)"
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}
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func (r *noRecursionRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
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report, errSt := loadReport(ctx, obs, "ns_recursion_error")
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if errSt != nil {
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return []sdk.CheckState{*errSt}
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}
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servers := probedServers(report)
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if len(servers) == 0 {
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return []sdk.CheckState{noProbesState("ns_recursion_skipped")}
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}
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out := make([]sdk.CheckState, 0, len(servers))
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for _, srv := range servers {
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state := sdk.CheckState{
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Subject: serverLabel(srv),
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Meta: serverMeta(srv),
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}
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switch {
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case srv.SOA.Error != "":
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state.Status = sdk.StatusUnknown
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state.Code = "ns_recursion_skipped"
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state.Message = fmt.Sprintf("query failed: %s", srv.SOA.Error)
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case srv.SOA.RecursionAvailable:
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state.Status = sdk.StatusWarn
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state.Code = "ns_recursion_available"
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state.Message = "recursion available (RA bit set)"
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default:
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state.Status = sdk.StatusOK
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state.Code = "ns_recursion_ok"
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state.Message = "recursion not available"
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}
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out = append(out, state)
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}
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return out
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}
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