LICENSE

@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2026 The happyDomain Authors
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the “Software”), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

checker/abstract.go

@@ -1,3 +1,24 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 package checker
 
 import (

checker/checks.go

@@ -1,3 +1,24 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 package checker
 
 import (

checker/collect.go

@@ -1,3 +1,24 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 package checker
 
 import (

checker/definition.go

@@ -1,3 +1,24 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 package checker
 
 import (

checker/interactive.go

@@ -1,103 +0,0 @@
-package checker
-
-import (
-	"encoding/json"
-	"errors"
-	"fmt"
-	"net/http"
-	"strings"
-
-	sdk "git.happydns.org/checker-sdk-go/checker"
-	"github.com/miekg/dns"
-)
-
-// RenderForm implements sdk.CheckerInteractive. It lists the minimal human
-// inputs needed to bootstrap a check when this checker runs standalone
-// (outside of a happyDomain host).
-func (p *nsProvider) RenderForm() []sdk.CheckerOptionField {
-	return []sdk.CheckerOptionField{
-		{
-			Id:          "domain",
-			Type:        "string",
-			Label:       "Domain name",
-			Placeholder: "example.com",
-			Required:    true,
-			Description: "Zone to probe. Its NS records will be resolved and each nameserver tested.",
-		},
-	}
-}
-
-// ParseForm implements sdk.CheckerInteractive. It resolves the NS records
-// for the requested domain via DNS and assembles the CheckerOptions that
-// Collect expects — replacing the AutoFill work that happyDomain would
-// otherwise perform.
-func (p *nsProvider) ParseForm(r *http.Request) (sdk.CheckerOptions, error) {
-	domain := strings.TrimSpace(r.FormValue("domain"))
-	if domain == "" {
-		return nil, errors.New("domain is required")
-	}
-	fqdn := dns.Fqdn(domain)
-
-	nsRecords, err := resolveNS(fqdn)
-	if err != nil {
-		return nil, fmt.Errorf("could not resolve NS records for %s: %w", domain, err)
-	}
-	if len(nsRecords) == 0 {
-		return nil, fmt.Errorf("no NS records found for %s", domain)
-	}
-
-	payload, err := json.Marshal(originPayload{NameServers: nsRecords})
-	if err != nil {
-		return nil, fmt.Errorf("failed to encode origin payload: %w", err)
-	}
-
-	svc := serviceMessage{
-		Type:    serviceTypeOrigin,
-		Domain:  "",
-		Service: payload,
-	}
-
-	return sdk.CheckerOptions{
-		"service":    svc,
-		"domainName": strings.TrimSuffix(fqdn, "."),
-	}, nil
-}
-
-// resolveNS queries the system resolver for the NS records of fqdn and
-// returns them as miekg *dns.NS records so they match the shape produced
-// by happyDomain's Origin service payload.
-func resolveNS(fqdn string) ([]*dns.NS, error) {
-	c := new(dns.Client)
-	m := new(dns.Msg)
-	m.SetQuestion(fqdn, dns.TypeNS)
-	m.RecursionDesired = true
-
-	config, err := dns.ClientConfigFromFile("/etc/resolv.conf")
-	if err != nil || config == nil || len(config.Servers) == 0 {
-		config = &dns.ClientConfig{Servers: []string{"1.1.1.1", "8.8.8.8"}, Port: "53"}
-	}
-
-	var lastErr error
-	for _, server := range config.Servers {
-		in, _, err := c.Exchange(m, server+":"+config.Port)
-		if err != nil {
-			lastErr = err
-			continue
-		}
-		if in.Rcode != dns.RcodeSuccess {
-			lastErr = fmt.Errorf("DNS response code %s", dns.RcodeToString[in.Rcode])
-			continue
-		}
-		var records []*dns.NS
-		for _, rr := range in.Answer {
-			if ns, ok := rr.(*dns.NS); ok {
-				records = append(records, ns)
-			}
-		}
-		return records, nil
-	}
-	if lastErr == nil {
-		lastErr = errors.New("no resolver available")
-	}
-	return nil, lastErr
-}

checker/provider.go

@@ -1,3 +1,24 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 package checker
 
 import (

checker/rule.go

@@ -1,8 +1,30 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 package checker
 
 import (
 	"context"
 	"fmt"
+	"strings"
 
 	sdk "git.happydns.org/checker-sdk-go/checker"
 )
@@ -63,65 +85,66 @@ type singleCheckRule struct {
 func (r *singleCheckRule) Name() string        { return r.ruleName }
 func (r *singleCheckRule) Description() string { return r.description }
 
-func (r *singleCheckRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, opts sdk.CheckerOptions) []sdk.CheckState {
+func (r *singleCheckRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, opts sdk.CheckerOptions) sdk.CheckState {
 	var report NSRestrictionsReport
 	if err := obs.Get(ctx, ObservationKeyNSRestrictions, &report); err != nil {
-		return []sdk.CheckState{{
+		return sdk.CheckState{
 			Status:  sdk.StatusError,
 			Message: fmt.Sprintf("Failed to get NS restrictions data: %v", err),
 			Code:    r.code + "_error",
-		}}
+		}
 	}
 
-	out := make([]sdk.CheckState, 0, len(report.Servers))
+	status := sdk.StatusOK
-	for _, srv := range report.Servers {
+	var summaryParts []string
-		meta := map[string]any{
+	failingServers := make([]map[string]string, 0)
-			"check":   r.checkName,
+	checked := false
-			"name":    srv.Name,
-			"address": srv.Address,
-		}
 
+	for _, srv := range report.Servers {
 		item, found := findCheck(srv.Checks, r.checkName)
 		if !found {
-			message := "check not performed"
+			// The collect step did not run this check on this server
+			// (e.g. IPv6 unreachable, DNS resolution failure). Surface
+			// the reason from whichever entry the server does have.
 			if len(srv.Checks) > 0 {
-				message = fmt.Sprintf("skipped: %s", srv.Checks[0].Detail)
+				summaryParts = append(summaryParts, fmt.Sprintf("%s: skipped (%s)", serverLabel(srv), srv.Checks[0].Detail))
+			} else {
+				summaryParts = append(summaryParts, fmt.Sprintf("%s: skipped", serverLabel(srv)))
 			}
-			out = append(out, sdk.CheckState{
-				Status:  sdk.StatusUnknown,
-				Message: message,
-				Code:    r.code + "_skipped",
-				Subject: serverLabel(srv),
-				Meta:    meta,
-			})
 			continue
 		}
 
-		state := sdk.CheckState{
+		checked = true
-			Code:    r.code + "_result",
+
-			Subject: serverLabel(srv),
-			Meta:    meta,
-			Message: item.Detail,
-		}
 		if item.OK {
-			state.Status = sdk.StatusOK
+			summaryParts = append(summaryParts, fmt.Sprintf("%s: OK", serverLabel(srv)))
-			if state.Message == "" {
+			continue
-				state.Message = "OK"
-			}
-		} else {
-			state.Status = r.failStatus
 		}
-		out = append(out, state)
+
+		if status < r.failStatus {
+			status = r.failStatus
+		}
+		summaryParts = append(summaryParts, fmt.Sprintf("%s: FAIL (%s)", serverLabel(srv), item.Detail))
+		failingServers = append(failingServers, map[string]string{
+			"name":    srv.Name,
+			"address": srv.Address,
+			"detail":  item.Detail,
+		})
 	}
 
-	if len(out) == 0 {
+	if !checked {
-		return []sdk.CheckState{{
+		status = sdk.StatusUnknown
-			Status:  sdk.StatusUnknown,
+	}
-			Message: "no nameserver to evaluate",
+
-			Code:    r.code + "_result",
+	return sdk.CheckState{
-		}}
+		Status:  status,
+		Message: strings.Join(summaryParts, " | "),
+		Code:    r.code + "_result",
+		Meta: map[string]any{
+			"check":           r.checkName,
+			"failing_servers": failingServers,
+		},
 	}
-	return out
 }
 
 func findCheck(items []NSCheckItem, name string) (NSCheckItem, bool) {

checker/types.go

@@ -1,3 +1,24 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 package checker
 
 import "encoding/json"

go.mod

@@ -3,7 +3,7 @@ module git.happydns.org/checker-ns-restrictions
 go 1.25.0
 
 require (
-	git.happydns.org/checker-sdk-go v1.2.0
+	git.happydns.org/checker-sdk-go v0.0.1
 	github.com/miekg/dns v1.1.72
 )
 

go.sum

@@ -1,5 +1,5 @@
-git.happydns.org/checker-sdk-go v1.2.0 h1:v4MpKAz0W3PwP+bxx3pya8w893sVH5xTD1of1cc0TV8=
+git.happydns.org/checker-sdk-go v0.0.1 h1:4RxCJr73HWKxjOyU/6NJMO8lXJmH0gMLA68EzTqLbQI=
-git.happydns.org/checker-sdk-go v1.2.0/go.mod h1:aNAcfYFfbhvH9kJhE0Njp5GX0dQbxdRB0rJ0KvSC5nI=
+git.happydns.org/checker-sdk-go v0.0.1/go.mod h1:aNAcfYFfbhvH9kJhE0Njp5GX0dQbxdRB0rJ0KvSC5nI=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/miekg/dns v1.1.72 h1:vhmr+TF2A3tuoGNkLDFK9zi36F2LS+hKTRW0Uf8kbzI=

main.go

@@ -1,3 +1,24 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 package main
 
 import (
@@ -8,14 +29,14 @@ import (
 	sdk "git.happydns.org/checker-sdk-go/checker"
 )
 
+var listenAddr = flag.String("listen", ":8080", "HTTP listen address")
+
 // Version is the standalone binary's version. It defaults to "custom-build"
 // and is meant to be overridden by the CI at link time:
 //
 //	go build -ldflags "-X main.Version=1.2.3" .
 var Version = "custom-build"
 
-var listenAddr = flag.String("listen", ":8080", "HTTP listen address")
-
 func main() {
 	flag.Parse()