Pierre-Olivier Mercier
90f1b4943f
Generic SRV records checker for happyDomain.
For each SRV record attached to an svcs.UnknownSRV service, the checker
resolves every target and probes reachability:
- DNS resolution (A/AAAA), CNAME detection (RFC 2782 violation),
null-target detection (RFC 2782 "service explicitly unavailable")
- TCP connect to target:port for _tcp SRVs
- UDP probe for _udp SRVs, using ICMP port-unreachable detection
The checker also publishes TLS endpoints (host, port, SNI) for every
SRV target hitting a well-known direct-TLS port (443, 465, 636, 853,
993, 995, 5061, 5223, …) via the EndpointDiscoverer SDK interface, so
a downstream TLS checker can pick them up.
The HTML report groups records as cards and surfaces the most common
failure scenarios (DNS failure, CNAME target, TCP unreachable,
null-target) at the top with remediation guidance.
70 lines
2 KiB
Go
70 lines
2 KiB
Go
// This file is part of the happyDomain (R) project.
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// Copyright (c) 2020-2026 happyDomain
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// Authors: Pierre-Olivier Mercier, et al.
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//
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// This program is offered under a commercial and under the AGPL license.
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// For commercial licensing, contact us at <contact@happydomain.org>.
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//
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// For AGPL licensing:
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//go:build standalone
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package checker
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import (
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"errors"
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"net/http"
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"strings"
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sdk "git.happydns.org/checker-sdk-go/checker"
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)
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func (p *srvProvider) RenderForm() []sdk.CheckerOptionField {
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return []sdk.CheckerOptionField{
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{
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Id: "name",
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Type: "string",
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Label: "SRV record name to check",
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Placeholder: "_sip._tcp.example.com",
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Required: true,
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Description: "Fully-qualified SRV owner name (e.g. _service._proto.domain).",
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},
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}
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}
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func (p *srvProvider) ParseForm(r *http.Request) (sdk.CheckerOptions, error) {
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name := strings.TrimSpace(r.FormValue("name"))
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if name == "" {
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return nil, errors.New("name is required")
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}
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name = strings.TrimSuffix(name, ".")
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// Split into subdomain + domain so collect's serviceDomain
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// (subdomain + "." + domain) reconstructs the full SRV owner.
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parts := strings.SplitN(name, ".", 2)
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sub := parts[0]
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parent := ""
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if len(parts) == 2 {
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parent = parts[1]
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} else {
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parent = name
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sub = ""
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}
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return sdk.CheckerOptions{
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"domain": parent,
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"subdomain": sub,
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}, nil
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}
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