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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.
This commit is contained in:
nemunaire 2026-04-19 10:28:39 +07:00
commit 90f1b4943f
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checker-srv
*.so

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FROM golang:1.25-alpine AS builder
ARG CHECKER_VERSION=custom-build
WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 go build -tags standalone -ldflags "-X main.Version=${CHECKER_VERSION}" -o /checker-srv .
FROM scratch
COPY --from=builder /checker-srv /checker-srv
USER 65534:65534
EXPOSE 8080
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
CMD ["/checker-srv", "-healthcheck"]
ENTRYPOINT ["/checker-srv"]

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happyDomain Licensing
SOFTWARE LICENSING
You may be licensed to use source code to create compiled versions not produced
by the happyDNS team in one of two ways:
1. Under the AGPL v3, subject to the exceptions outlined in this policy;
2. Under a commercial license available from the happyDNS team by contacting
contact@happydns.org.
happyDNS and happyDomain TRADEMARK GUIDELINES
Your use of the mark happyDNS and happyDomain is subject to the happyDNS team's
prior written approval and our organization’s Trademark Standards of Use at
http://www.happydomain.org/trademark-standards-of-use/. For trademark approval
or any questions you have about using these trademarks, please email
contact@happydns.org
------------------------------------------------------------------------------------------------------------------------------
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
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/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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CHECKER_NAME := checker-srv
CHECKER_IMAGE := happydomain/$(CHECKER_NAME)
CHECKER_VERSION ?= custom-build
CHECKER_SOURCES := main.go $(wildcard checker/*.go)
GO_LDFLAGS := -X main.Version=$(CHECKER_VERSION)
.PHONY: all plugin docker test clean
all: $(CHECKER_NAME)
$(CHECKER_NAME): $(CHECKER_SOURCES)
go build -tags standalone -ldflags "$(GO_LDFLAGS)" -o $@ .
plugin: $(CHECKER_NAME).so
$(CHECKER_NAME).so: $(CHECKER_SOURCES) $(wildcard plugin/*.go)
go build -buildmode=plugin -ldflags "$(GO_LDFLAGS)" -o $@ ./plugin/
docker:
docker build --build-arg CHECKER_VERSION=$(CHECKER_VERSION) -t $(CHECKER_IMAGE) .
test:
go test -tags standalone ./...
clean:
rm -f $(CHECKER_NAME) $(CHECKER_NAME).so

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# checker-srv
Generic SRV records checker for [happyDomain](https://www.happydomain.org/).
For every SRV record attached to a service, verifies:
- DNS resolution of each target (A/AAAA)
- RFC 2782 compliance: target is not `"."` (null), target is not a CNAME
- TCP reachability on `target:port` (for `_tcp` SRVs)
- UDP reachability on `target:port` (for `_udp` SRVs), via ICMP port-unreachable detection
TLS/certificate testing is intentionally out of scope, it belongs to a dedicated TLS checker.
The HTML report surfaces the most common failure scenarios at the top with actionable remediation guidance (DNS failure, CNAME-as-target, TCP unreachable, explicit null-target).
## Usage
### Standalone HTTP server
```bash
# Build and run
make
./checker-srv -listen :8080
```
The server exposes:
- `GET /health`, health check
- `GET /definition`, checker definition (options, rules, availability)
- `POST /collect`, collect SRV observations (happyDomain external checker protocol)
- `POST /evaluate`, evaluate observations against the rules
- `POST /report`, render the HTML report
### Docker
```bash
make docker
docker run -p 8080:8080 happydomain/checker-srv
```
### happyDomain plugin
```bash
make plugin
# produces checker-srv.so, loadable by happyDomain as a Go plugin
```
The plugin exposes a `NewCheckerPlugin` symbol returning the checker
definition and observation provider, which happyDomain registers in its
global registries at load time.
### Versioning
The binary, plugin, and Docker image embed a version string overridable
at build time:
```bash
make CHECKER_VERSION=1.2.3
make plugin CHECKER_VERSION=1.2.3
make docker CHECKER_VERSION=1.2.3
```
### happyDomain remote endpoint
Set the `endpoint` admin option for the SRV checker to the URL of the running checker-srv server (e.g., `http://checker-srv:8080`). happyDomain will delegate observation collection to this endpoint.
## Protocol
### POST /collect
Request:
```json
{
"key": "srv_records",
"target": {"userId": "...", "domainId": "...", "serviceId": "..."},
"options": {
"service": {"_svctype": "svcs.UnknownSRV", "Service": {"srv": [ /* dns.SRV records */ ]}},
"subdomain": "_sip._tcp",
"domain": "example.com",
"tcpTimeout": 3000,
"udpTimeout": 2000
}
}
```
Response:
```json
{
"data": {
"serviceDomain": "_sip._tcp.example.com",
"records": [
{
"service": "sip",
"proto": "tcp",
"owner": "_sip._tcp.example.com",
"target": "sip1.example.com",
"port": 5061,
"priority": 10,
"weight": 20,
"addresses": ["203.0.113.5"],
"probes": [
{
"address": "203.0.113.5:5061",
"proto": "tcp",
"connected": true,
"latencyMs": 12.4
}
]
}
]
}
}
```
## Discovered TLS endpoints
As a by-product of every `/collect`, this checker publishes
`DiscoveryEntry` records of type `tls.endpoint.v1` (see
[`checker-tls/contract`](https://git.happydns.org/checker-tls/tree/master/contract))
so that the TLS checker can probe the targets without re-parsing SRV data:
- **Direct TLS** entries (empty `STARTTLS`) for service names that imply
implicit TLS on connect: `_https`, `_ldaps`, `_sips`, `_imaps`, `_pop3s`,
`_smtps`, `_submissions`, `_xmpps-client`, `_xmpps-server`, `_ftps`,
`_nntps`, `_ircs`, `_telnets`, `_ipps`, `_mqtts`, `_coaps`, `_stuns`,
`_turns`.
- **STARTTLS** entries for service names that upgrade mid-stream:
`_smtp` (opportunistic), `_submission` (required), `_imap` (required),
`_pop3` (required), `_xmpp-client` (required), `_xmpp-server`
(opportunistic), `_ldap`, `_nntp`, `_ftp`, `_sieve`, `_postgresql`.
Null targets (`.`) and unknown service names are skipped. SNI is set to
the SRV target hostname.
## Rules
| Name | Description |
|---|---|
| `srv_records_present` | At least one SRV record is published. |
| `srv_null_target` | Detects `"."` targets (RFC 2782, service intentionally unavailable). |
| `srv_target_not_cname` | Warns when an SRV target is a CNAME (RFC 2782 violation). |
| `srv_targets_resolve` | Every target resolves to at least one A/AAAA. |
| `srv_tcp_reachable` | Every `_tcp` SRV `target:port` accepts a TCP connection. |
| `srv_udp_reachable` | UDP targets do not return ICMP port-unreachable. |
| `srv_redundancy` | At least two distinct targets exist (no single point of failure). |
## License & licensing roadmap
This project is currently licensed under the **GNU Affero General Public
License v3.0** (see `LICENSE`), because it still imports
`happydns.ServiceMessage` from the happyDomain server module
(`git.happydns.org/happyDomain/model`), which is itself distributed under
AGPL-3.0 and a commercial license.
The core checker types (`CheckerOptions`, `CheckerDefinition`,
`ObservationProvider`, `CheckRule`, …) have already been migrated to
[`checker-sdk-go`](https://git.happydns.org/checker-sdk-go); only the
service-message types remain on the AGPL side.
**Planned relicensing:** as soon as the remaining `ServiceMessage`
dependency has been removed (moved into a dedicated permissively licensed
module), this project will be relicensed under the **MIT License**, in
line with the rest of the happyDomain checker ecosystem (see
`checker-dummy` for the target shape).
**Contributors notice:** by submitting a contribution to this repository,
you accept that your contribution will be relicensed from AGPL-3.0 to MIT
at the time of the relicensing described above. If you do not agree with
this, please do not submit contributions until the relicensing has taken
place.
The third-party Apache-2.0 attributions for `checker-sdk-go` are recorded
in `NOTICE` and must accompany any binary or source redistribution of this
project.

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// 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"
"encoding/json"
"fmt"
"net"
"strconv"
"strings"
"time"
sdk "git.happydns.org/checker-sdk-go/checker"
happydns "git.happydns.org/happyDomain/model"
)
// We decode SRV records by hand (instead of importing miekg/dns) so the
// checker stays light and its build surface minimal.
type unknownSRVPayload struct {
Records []struct {
Hdr struct {
Name string `json:"Name"`
} `json:"Hdr"`
Priority uint16 `json:"Priority"`
Weight uint16 `json:"Weight"`
Port uint16 `json:"Port"`
Target string `json:"Target"`
} `json:"srv"`
}
func (p *srvProvider) Collect(ctx context.Context, opts sdk.CheckerOptions) (any, error) {
svcMsg, ok := sdk.GetOption[happydns.ServiceMessage](opts, "service")
if !ok {
return p.collectFallback(ctx, opts)
}
if svcMsg.Type != "svcs.UnknownSRV" {
return nil, fmt.Errorf("service type is %q, expected svcs.UnknownSRV", svcMsg.Type)
}
var payload unknownSRVPayload
if err := json.Unmarshal(svcMsg.Service, &payload); err != nil {
return nil, fmt.Errorf("failed to decode UnknownSRV: %w", err)
}
if len(payload.Records) == 0 {
return nil, fmt.Errorf("service contains no SRV records")
}
subdomain, _ := sdk.GetOption[string](opts, "subdomain")
domain, _ := sdk.GetOption[string](opts, "domain")
serviceDomain := strings.TrimSuffix(subdomain, ".")
if domain != "" {
if serviceDomain != "" {
serviceDomain += "." + strings.TrimSuffix(domain, ".")
} else {
serviceDomain = strings.TrimSuffix(domain, ".")
}
}
tcpTimeout := durationOpt(opts, "tcpTimeout", 3000)
udpTimeout := durationOpt(opts, "udpTimeout", 2000)
data := &SRVData{
ServiceDomain: serviceDomain,
Records: make([]SRVRecord, 0, len(payload.Records)),
}
for _, r := range payload.Records {
owner := strings.TrimSuffix(r.Hdr.Name, ".")
svc, proto := parseOwner(owner, serviceDomain)
rec := SRVRecord{
Service: svc,
Proto: proto,
Owner: owner,
Target: strings.TrimSuffix(r.Target, "."),
Port: r.Port,
Priority: r.Priority,
Weight: r.Weight,
}
resolveAndProbe(ctx, &rec, tcpTimeout, udpTimeout)
data.Records = append(data.Records, rec)
}
return data, nil
}
// Owners that don't match _svc._proto have no proto we can trust, so we
// skip probing rather than silently defaulting to TCP and reporting a misleading status.
func resolveAndProbe(ctx context.Context, rec *SRVRecord, tcpTimeout, udpTimeout time.Duration) {
// RFC 2782: "." target means "service decidedly not available".
if rec.Target == "" || rec.Target == "." {
rec.IsNullTarget = true
return
}
// CNAME detection (RFC 2782 §"Usage rules": target MUST be a name that
// resolves to A/AAAA records directly, not a CNAME).
if cname, err := net.DefaultResolver.LookupCNAME(ctx, rec.Target); err == nil {
canon := strings.TrimSuffix(cname, ".")
if canon != "" && !strings.EqualFold(canon, rec.Target) {
rec.IsCNAME = true
rec.CNAMEChain = []string{rec.Target, canon}
}
}
ips, err := net.DefaultResolver.LookupIPAddr(ctx, rec.Target)
if err != nil {
rec.ResolveError = err.Error()
return
}
for _, ip := range ips {
rec.Addresses = append(rec.Addresses, ip.IP.String())
}
for _, addr := range rec.Addresses {
hostport := net.JoinHostPort(addr, strconv.Itoa(int(rec.Port)))
switch rec.Proto {
case protoTCP:
rec.Probes = append(rec.Probes, probeTCP(ctx, hostport, tcpTimeout))
case protoUDP:
rec.Probes = append(rec.Probes, probeUDP(ctx, hostport, udpTimeout))
}
}
}
func parseOwner(owner, serviceDomain string) (svc, proto string) {
// Returns ("", "") when the owner does not match: callers must treat
// that as "unknown" and skip proto-specific probing rather than guessing.
s := strings.TrimSuffix(owner, "."+serviceDomain)
parts := strings.Split(s, ".")
if len(parts) >= 2 && strings.HasPrefix(parts[0], "_") && strings.HasPrefix(parts[1], "_") {
return strings.TrimPrefix(parts[0], "_"), strings.TrimPrefix(parts[1], "_")
}
return "", ""
}
func durationOpt(opts sdk.CheckerOptions, key string, defMs int) time.Duration {
ms := defMs
if v, ok := opts[key]; ok {
switch n := v.(type) {
case float64:
ms = int(n)
case int:
ms = n
}
}
if ms < 100 {
ms = 100
}
if ms > 60000 {
ms = 60000
}
return time.Duration(ms) * time.Millisecond
}
func probeTCP(ctx context.Context, hostport string, timeout time.Duration) ProbeResult {
pr := ProbeResult{Address: hostport, Proto: protoTCP}
start := time.Now()
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
conn, err := (&net.Dialer{}).DialContext(ctx, protoTCP, hostport)
pr.LatencyMs = float64(time.Since(start).Microseconds()) / 1000.0
if err != nil {
pr.Error = err.Error()
return pr
}
_ = conn.Close()
pr.Connected = true
return pr
}
func probeUDP(ctx context.Context, hostport string, timeout time.Duration) ProbeResult {
pr := ProbeResult{Address: hostport, Proto: protoUDP}
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
conn, err := (&net.Dialer{}).DialContext(ctx, protoUDP, hostport)
if err != nil {
pr.Error = err.Error()
return pr
}
defer conn.Close()
// Send a single zero byte. If the host has nothing listening and returns
// ICMP port-unreachable, a subsequent Read will fail with "connection
// refused". Silent drops (firewalled) remain indistinguishable from a
// working service, report as "reachable (no response)".
_ = conn.SetDeadline(time.Now().Add(timeout))
if _, err := conn.Write([]byte{0}); err != nil {
pr.Error = err.Error()
return pr
}
buf := make([]byte, 1)
_, err = conn.Read(buf)
if err != nil {
if ne, ok := err.(net.Error); ok && ne.Timeout() {
// No ICMP unreachable came back: host probably accepts UDP,
// or packets are silently dropped. Treat as "reachable".
pr.Connected = true
pr.Error = "no UDP response (host may still be reachable)"
return pr
}
pr.Error = err.Error()
return pr
}
pr.Connected = true
return pr
}

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// 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/>.
//go:build !standalone
package checker
import (
"context"
"fmt"
sdk "git.happydns.org/checker-sdk-go/checker"
)
func (p *srvProvider) collectFallback(ctx context.Context, opts sdk.CheckerOptions) (any, error) {
return nil, fmt.Errorf("service not provided")
}

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// 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/>.
//go:build standalone
package checker
import (
"context"
"fmt"
"net"
"strings"
sdk "git.happydns.org/checker-sdk-go/checker"
)
// collectFallback queries DNS for SRV records directly when no upstream
// service payload is available (standalone CLI/HTTP mode).
func (p *srvProvider) collectFallback(ctx context.Context, opts sdk.CheckerOptions) (any, error) {
subdomain, _ := sdk.GetOption[string](opts, "subdomain")
domain, _ := sdk.GetOption[string](opts, "domain")
serviceDomain := strings.TrimSuffix(subdomain, ".")
if domain != "" {
if serviceDomain != "" {
serviceDomain += "." + strings.TrimSuffix(domain, ".")
} else {
serviceDomain = strings.TrimSuffix(domain, ".")
}
}
if serviceDomain == "" {
return nil, fmt.Errorf("missing 'domain' option")
}
// Empty service/proto tells the resolver to query the literal name as-is,
// preserving _svc._proto labels already encoded in serviceDomain.
_, srvs, err := net.DefaultResolver.LookupSRV(ctx, "", "", serviceDomain)
if err != nil {
return nil, fmt.Errorf("SRV lookup for %s: %w", serviceDomain, err)
}
if len(srvs) == 0 {
return nil, fmt.Errorf("no SRV records at %s", serviceDomain)
}
tcpTimeout := durationOpt(opts, "tcpTimeout", 3000)
udpTimeout := durationOpt(opts, "udpTimeout", 2000)
svc, proto := parseOwner(serviceDomain, serviceDomain)
data := &SRVData{
ServiceDomain: serviceDomain,
Records: make([]SRVRecord, 0, len(srvs)),
}
for _, s := range srvs {
rec := SRVRecord{
Service: svc,
Proto: proto,
Owner: serviceDomain,
Target: strings.TrimSuffix(s.Target, "."),
Port: s.Port,
Priority: s.Priority,
Weight: s.Weight,
}
resolveAndProbe(ctx, &rec, tcpTimeout, udpTimeout)
data.Records = append(data.Records, rec)
}
return data, nil
}

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// 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 (
"time"
sdk "git.happydns.org/checker-sdk-go/checker"
)
var Version = "built-in"
func (p *srvProvider) Definition() *sdk.CheckerDefinition {
return &sdk.CheckerDefinition{
ID: "srv",
Name: "SRV Records Tester",
Version: Version,
Availability: sdk.CheckerAvailability{
ApplyToService: true,
LimitToServices: []string{"svcs.UnknownSRV"},
},
HasHTMLReport: true,
ObservationKeys: []sdk.ObservationKey{ObservationKeySRV},
Options: sdk.CheckerOptionsDocumentation{
UserOpts: []sdk.CheckerOptionDocumentation{
{
Id: "tcpTimeout",
Type: "number",
Label: "TCP connect timeout (ms)",
Default: float64(3000),
Description: "Max time to wait for a TCP handshake on each target.",
},
{
Id: "udpTimeout",
Type: "number",
Label: "UDP probe timeout (ms)",
Default: float64(2000),
Description: "Max time to wait for a UDP response or ICMP unreachable.",
},
},
ServiceOpts: []sdk.CheckerOptionDocumentation{
{
Id: "service",
Label: "Service",
AutoFill: sdk.AutoFillService,
Hide: true,
},
{
Id: "subdomain",
Label: "Subdomain",
AutoFill: sdk.AutoFillSubdomain,
Hide: true,
},
{
Id: "domain",
Label: "Domain",
AutoFill: sdk.AutoFillDomainName,
Hide: true,
},
},
},
Rules: Rules(),
Interval: &sdk.CheckIntervalSpec{
Min: 5 * time.Minute,
Max: 7 * 24 * time.Hour,
Default: 6 * time.Hour,
},
}
}

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// 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 (
"fmt"
sdk "git.happydns.org/checker-sdk-go/checker"
tlsct "git.happydns.org/checker-tls/contract"
)
// Matching on the service name is more authoritative than matching on the
// port: port 636 could carry anything, but _ldaps._tcp unambiguously
// designates LDAP over TLS, even on a non-standard port.
var directTLSServices = map[string]bool{
"https": true,
"ftps": true, // FTPS implicit
"smtps": true, // SMTP over TLS (legacy port 465 semantics)
"submissions": true, // RFC 8314: SMTP submission over TLS
"imaps": true,
"pop3s": true,
"nntps": true,
"ircs": true,
"telnets": true,
"ldaps": true,
"sips": true,
"ipps": true, // IPP over TLS (printing)
"xmpps-client": true, // XMPP client over direct TLS
"xmpps-server": true, // XMPP server-to-server over direct TLS
"mqtts": true,
"coaps": true,
"stuns": true,
"turns": true,
}
type starttlsSpec struct {
// When two SRV services share the same wire upgrade (submission/smtp both do
// ESMTP STARTTLS), Proto is the canonical one agreed with checker-tls/contract.
Proto string
// Required is false for opportunistic STARTTLS (e.g. SMTP on port 25, s2s XMPP).
// The consumer uses this to pick severity when the server does not advertise STARTTLS.
Required bool
}
// Proto values follow the tls.endpoint.v1 contract's vocabulary; the SDK
// itself has no opinion on these values, they belong to checker-tls.
var starttlsServices = map[string]starttlsSpec{
"submission": {"smtp", true}, // RFC 8314: STARTTLS required
"smtp": {"smtp", false}, // port 25: opportunistic
"imap": {"imap", true},
"pop3": {"pop3", true},
"xmpp-client": {"xmpp-client", true}, // RFC 7590
"xmpp-server": {"xmpp-server", false}, // s2s: opportunistic
"ldap": {"ldap", false},
"nntp": {"nntp", false},
"ftp": {"ftp", false},
"sieve": {"sieve", true},
"postgresql": {"postgres", false},
}
// DiscoverEntries publishes tls.endpoint.v1 entries for known TLS/STARTTLS services.
// Unknown service names produce no entries: we lean on the SRV naming
// convention rather than guessing from the port, since a port alone
// conveys no protocol semantics.
func (p *srvProvider) DiscoverEntries(data any) ([]sdk.DiscoveryEntry, error) {
d, ok := data.(*SRVData)
if !ok {
return nil, fmt.Errorf("unexpected data type %T", data)
}
var out []sdk.DiscoveryEntry
for _, r := range d.Records {
if r.IsNullTarget || r.Target == "" {
continue
}
if directTLSServices[r.Service] {
e, err := tlsct.NewEntry(tlsct.TLSEndpoint{
Host: r.Target,
Port: r.Port,
SNI: r.Target,
})
if err != nil {
return nil, fmt.Errorf("build tls entry for %s:%d: %w", r.Target, r.Port, err)
}
out = append(out, e)
continue
}
if spec, ok := starttlsServices[r.Service]; ok {
e, err := tlsct.NewEntry(tlsct.TLSEndpoint{
Host: r.Target,
Port: r.Port,
SNI: r.Target,
STARTTLS: spec.Proto,
RequireSTARTTLS: spec.Required,
})
if err != nil {
return nil, fmt.Errorf("build starttls entry for %s:%d: %w", r.Target, r.Port, err)
}
out = append(out, e)
}
}
return out, nil
}

70
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// 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/>.
//go:build standalone
package checker
import (
"errors"
"net/http"
"strings"
sdk "git.happydns.org/checker-sdk-go/checker"
)
func (p *srvProvider) RenderForm() []sdk.CheckerOptionField {
return []sdk.CheckerOptionField{
{
Id: "name",
Type: "string",
Label: "SRV record name to check",
Placeholder: "_sip._tcp.example.com",
Required: true,
Description: "Fully-qualified SRV owner name (e.g. _service._proto.domain).",
},
}
}
func (p *srvProvider) ParseForm(r *http.Request) (sdk.CheckerOptions, error) {
name := strings.TrimSpace(r.FormValue("name"))
if name == "" {
return nil, errors.New("name is required")
}
name = strings.TrimSuffix(name, ".")
// Split into subdomain + domain so collect's serviceDomain
// (subdomain + "." + domain) reconstructs the full SRV owner.
parts := strings.SplitN(name, ".", 2)
sub := parts[0]
parent := ""
if len(parts) == 2 {
parent = parts[1]
} else {
parent = name
sub = ""
}
return sdk.CheckerOptions{
"domain": parent,
"subdomain": sub,
}, nil
}

36
checker/provider.go Normal file
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// 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 (
sdk "git.happydns.org/checker-sdk-go/checker"
)
func Provider() sdk.ObservationProvider {
return &srvProvider{}
}
type srvProvider struct{}
func (p *srvProvider) Key() sdk.ObservationKey {
return ObservationKeySRV
}

312
checker/report.go Normal file
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// 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"
"fmt"
"html/template"
"strings"
sdk "git.happydns.org/checker-sdk-go/checker"
)
type reportData struct {
ServiceDomain string
Records []reportRecord
Alerts []reportAlert
Totals reportTotals
}
type reportRecord struct {
Owner string
Service string
Proto string
Target string
Port uint16
Priority uint16
Weight uint16
IsNullTarget bool
IsCNAME bool
CNAMEChain string
Addresses []string
ResolveError string
Probes []reportProbe
}
type reportProbe struct {
Address string
Proto string
Connected bool
LatencyMs float64
Error string
StatusClass string
StatusLabel string
}
type reportAlert struct {
Severity string // "crit", "warn", "info"
Title string
Body template.HTML
}
type reportTotals struct {
Records int
OKProbes int
BadProbes int
}
var htmlTpl = template.Must(template.New("srv").Parse(`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>SRV Records Report</title>
<style>
*,*::before,*::after{box-sizing:border-box}
:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:14px;line-height:1.5;color:#1f2937;background:#f3f4f6}
body{margin:0;padding:1rem}
code{font-family:ui-monospace,monospace;font-size:.9em}
h1{margin:0 0 .4rem;font-size:1.15rem}
h2{font-size:1rem;margin:0 0 .6rem}
h3{font-size:.9rem;font-weight:600;margin:0 0 .4rem}
.hd,.section{background:#fff;border-radius:10px;padding:1rem 1.25rem;margin-bottom:.75rem;box-shadow:0 1px 3px rgba(0,0,0,.08)}
.section{border-radius:8px;padding:.85rem 1rem;margin-bottom:.6rem}
.badge{display:inline-flex;align-items:center;padding:.2em .65em;border-radius:9999px;font-size:.78rem;font-weight:700}
.ok{background:#d1fae5;color:#065f46}
.warn{background:#fef3c7;color:#92400e}
.crit{background:#fee2e2;color:#991b1b}
.info{background:#dbeafe;color:#1e40af}
.alert{border-left:4px solid #d1d5db;padding:.6rem .85rem;margin-bottom:.55rem;background:#fff;border-radius:6px;box-shadow:0 1px 3px rgba(0,0,0,.05)}
.alert.crit{border-left-color:#dc2626}
.alert.warn{border-left-color:#d97706}
.alert.info{border-left-color:#2563eb}
.alert .title{font-weight:600;margin-bottom:.2rem}
.alert .body{font-size:.88rem;color:#374151}
.alert .body code{background:#f3f4f6;padding:.05rem .3rem;border-radius:3px}
.rec{border:1px solid #e5e7eb;border-radius:8px;padding:.7rem .85rem;margin-bottom:.55rem;background:#fff}
.rec-hd{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin-bottom:.4rem}
.rec-hd .target{font-family:ui-monospace,monospace;font-weight:600}
.rec-hd .meta{color:#6b7280;font-size:.82rem}
table{border-collapse:collapse;width:100%;font-size:.85rem;margin-top:.25rem}
th,td{text-align:left;padding:.3rem .5rem;border-bottom:1px solid #f3f4f6}
th{font-weight:600;color:#6b7280;background:#f9fafb}
.errmsg{color:#b91c1c}
.note{color:#6b7280;font-size:.85rem}
.totals{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.25rem}
.tot{background:#f3f4f6;border-radius:6px;padding:.25rem .6rem;font-size:.8rem}
</style>
</head>
<body>
<div class="hd">
<h1>SRV Records &mdash; {{if .ServiceDomain}}<code>{{.ServiceDomain}}</code>{{else}}service{{end}}</h1>
<div class="totals">
<span class="tot">{{.Totals.Records}} record(s)</span>
<span class="tot">{{.Totals.OKProbes}} reachable probe(s)</span>
{{if .Totals.BadProbes}}<span class="tot" style="background:#fee2e2;color:#991b1b">{{.Totals.BadProbes}} failed probe(s)</span>{{end}}
</div>
</div>
{{if .Alerts}}
<div class="section">
<h2>What needs attention</h2>
{{range .Alerts}}
<div class="alert {{.Severity}}">
<div class="title">{{.Title}}</div>
<div class="body">{{.Body}}</div>
</div>
{{end}}
</div>
{{end}}
<div class="section">
<h2>Records</h2>
{{range .Records}}
<div class="rec">
<div class="rec-hd">
<span class="target">{{if .IsNullTarget}}<em>(null target)</em>{{else}}{{.Target}}{{end}}:{{.Port}}</span>
<span class="meta">prio {{.Priority}} &middot; weight {{.Weight}}</span>
{{if .Service}}<span class="meta">_{{.Service}}._{{.Proto}}</span>{{end}}
{{if .IsNullTarget}}<span class="badge warn">null target</span>{{end}}
{{if .IsCNAME}}<span class="badge warn">target is CNAME</span>{{end}}
{{if .ResolveError}}<span class="badge crit">DNS error</span>{{end}}
</div>
{{if .CNAMEChain}}
<p class="note">CNAME chain: <code>{{.CNAMEChain}}</code> &mdash; RFC 2782 forbids a CNAME as SRV target.</p>
{{end}}
{{if .ResolveError}}
<p class="errmsg">Resolution failed: {{.ResolveError}}</p>
{{end}}
{{if .Addresses}}
<p class="note">Resolves to: {{range .Addresses}}<code>{{.}}</code> {{end}}</p>
{{end}}
{{if .Probes}}
<table>
<tr>
<th>Address</th><th>Proto</th><th>Status</th><th>Latency</th><th>Details</th>
</tr>
{{range .Probes}}
<tr>
<td><code>{{.Address}}</code></td>
<td>{{.Proto}}</td>
<td><span class="badge {{.StatusClass}}">{{.StatusLabel}}</span></td>
<td>{{if .LatencyMs}}{{printf "%.1f ms" .LatencyMs}}{{end}}</td>
<td>{{if .Error}}<span class="errmsg">{{.Error}}</span>{{end}}</td>
</tr>
{{end}}
</table>
{{end}}
</div>
{{end}}
</div>
</body>
</html>`))
func (p *srvProvider) GetHTMLReport(ctx sdk.ReportContext) (string, error) {
var d SRVData
if err := json.Unmarshal(ctx.Data(), &d); err != nil {
return "", fmt.Errorf("failed to unmarshal SRV report: %w", err)
}
rd := reportData{ServiceDomain: d.ServiceDomain}
rd.Totals.Records = len(d.Records)
var resolveFails, cnames, nulls []string
type tcpFailure struct{ owner, address, err string }
var tcpDown []tcpFailure
for _, r := range d.Records {
rec := reportRecord{
Owner: r.Owner,
Service: r.Service,
Proto: r.Proto,
Target: r.Target,
Port: r.Port,
Priority: r.Priority,
Weight: r.Weight,
IsNullTarget: r.IsNullTarget,
IsCNAME: r.IsCNAME,
Addresses: r.Addresses,
ResolveError: r.ResolveError,
}
if len(r.CNAMEChain) > 0 {
rec.CNAMEChain = strings.Join(r.CNAMEChain, " → ")
}
if r.IsNullTarget {
nulls = append(nulls, r.Owner)
}
if r.IsCNAME {
cnames = append(cnames, template.HTMLEscapeString(r.Target))
}
if r.ResolveError != "" {
resolveFails = append(resolveFails, fmt.Sprintf("%s (%s)",
template.HTMLEscapeString(r.Target),
template.HTMLEscapeString(r.ResolveError)))
}
for _, pr := range r.Probes {
rp := reportProbe{
Address: pr.Address,
Proto: pr.Proto,
Connected: pr.Connected,
LatencyMs: pr.LatencyMs,
Error: pr.Error,
}
switch {
case pr.Connected:
rp.StatusClass = "ok"
rp.StatusLabel = "reachable"
rd.Totals.OKProbes++
default:
rp.StatusClass = "crit"
rp.StatusLabel = "unreachable"
rd.Totals.BadProbes++
if pr.Proto == "tcp" {
tcpDown = append(tcpDown, tcpFailure{r.Owner, pr.Address, pr.Error})
}
}
rec.Probes = append(rec.Probes, rp)
}
rd.Records = append(rd.Records, rec)
}
if len(resolveFails) > 0 {
rd.Alerts = append(rd.Alerts, reportAlert{
Severity: "crit",
Title: fmt.Sprintf("DNS resolution failed for %d SRV target(s)", len(resolveFails)),
Body: template.HTML(fmt.Sprintf(
"%s<br>Clients will not be able to reach the service. Fix: either publish A/AAAA records for the target(s), or remove the broken SRV record.",
strings.Join(resolveFails, "<br>"))),
})
}
if len(cnames) > 0 {
rd.Alerts = append(rd.Alerts, reportAlert{
Severity: "warn",
Title: "SRV target is a CNAME (RFC 2782 violation)",
Body: template.HTML(fmt.Sprintf(
"Target(s): %s<br>RFC 2782 requires SRV targets to resolve directly to A/AAAA. "+
"Some clients will refuse to follow the CNAME. Fix: point the SRV record to a hostname with A/AAAA records, "+
"or replace the CNAME with an ALIAS/ANAME at the DNS provider.",
"<code>"+strings.Join(cnames, "</code>, <code>")+"</code>")),
})
}
if len(tcpDown) > 0 {
var items []string
for _, f := range tcpDown {
items = append(items, fmt.Sprintf("<code>%s</code> (%s): %s",
template.HTMLEscapeString(f.address),
template.HTMLEscapeString(f.owner),
template.HTMLEscapeString(f.err)))
}
rd.Alerts = append(rd.Alerts, reportAlert{
Severity: "crit",
Title: fmt.Sprintf("%d target(s) unreachable on their advertised TCP port", len(tcpDown)),
Body: template.HTML(strings.Join(items, "<br>") +
"<br>Check: (1) the server is running and bound to the right port; " +
"(2) firewall/security-group allows inbound TCP to that port; " +
"(3) the SRV record is not pointing at an old IP."),
})
}
if len(nulls) > 0 && len(nulls) == len(d.Records) {
rd.Alerts = append(rd.Alerts, reportAlert{
Severity: "warn",
Title: "All SRV records use the null target (\".\"): service is explicitly disabled",
Body: template.HTML(
"RFC 2782 defines a single SRV record with target <code>\".\"</code> to signal that the service is " +
"intentionally not available. If this is what you want, the configuration is correct. " +
"If you expected clients to reach this service, replace the null target with a real hostname."),
})
}
var buf strings.Builder
if err := htmlTpl.Execute(&buf, rd); err != nil {
return "", fmt.Errorf("failed to render SRV HTML report: %w", err)
}
return buf.String(), nil
}

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// 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"
sdk "git.happydns.org/checker-sdk-go/checker"
)
// One rule per concern so each failure is individually visible rather than buried in a single rule's Code field.
func Rules() []sdk.CheckRule {
return []sdk.CheckRule{
RulePresent(),
RuleNullTarget(),
RuleTargetNotCNAME(),
RuleTargetsResolve(),
RuleTCPReachable(),
RuleUDPReachable(),
RulePortValid(),
RulePriorityWeightSanity(),
RuleRedundancy(),
}
}
func getData(ctx context.Context, obs sdk.ObservationGetter) (*SRVData, *sdk.CheckState) {
var d SRVData
if err := obs.Get(ctx, ObservationKeySRV, &d); err != nil {
return nil, &sdk.CheckState{
Status: sdk.StatusError,
Message: fmt.Sprintf("Failed to load SRV observation: %v", err),
Code: "srv_obs_error",
}
}
return &d, nil
}
func countProbeResults(d *SRVData, proto string) (total, ok int, failed []string) {
for _, r := range d.Records {
if r.IsNullTarget || r.Proto != proto {
continue
}
for _, pr := range r.Probes {
total++
if pr.Connected {
ok++
} else {
failed = append(failed, fmt.Sprintf("%s: %s", pr.Address, pr.Error))
}
}
}
return
}

59
checker/rules_cname.go Normal file
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// 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"
)
type ruleTargetNotCNAME struct{}
func RuleTargetNotCNAME() sdk.CheckRule { return &ruleTargetNotCNAME{} }
func (ruleTargetNotCNAME) Name() string { return "srv_target_not_cname" }
func (ruleTargetNotCNAME) Description() string {
return "RFC 2782: SRV targets must resolve directly to A/AAAA, not through a CNAME."
}
func (ruleTargetNotCNAME) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
d, cs := getData(ctx, obs)
if cs != nil {
return []sdk.CheckState{*cs}
}
var bad []string
for _, r := range d.Records {
if r.IsNullTarget {
continue
}
if r.IsCNAME {
bad = append(bad, r.Target)
}
}
if len(bad) == 0 {
return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_targets_not_cname",
Message: "All SRV targets resolve directly (no CNAME)."}}
}
return []sdk.CheckState{{Status: sdk.StatusWarn, Code: "srv_targets_are_cname",
Message: fmt.Sprintf("RFC 2782 violation, SRV target(s) are CNAMEs: %s", strings.Join(bad, ", "))}}
}

60
checker/rules_null_target.go Normal file
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// 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"
)
type ruleNullTarget struct{}
func RuleNullTarget() sdk.CheckRule { return &ruleNullTarget{} }
func (ruleNullTarget) Name() string { return "srv_null_target" }
func (ruleNullTarget) Description() string {
return "Detects SRV records with target \".\", which signals the service is intentionally not available."
}
func (ruleNullTarget) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
d, cs := getData(ctx, obs)
if cs != nil {
return []sdk.CheckState{*cs}
}
var nulls []string
for _, r := range d.Records {
if r.IsNullTarget {
nulls = append(nulls, r.Owner)
}
}
if len(nulls) == 0 {
return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_no_null",
Message: "No null-target SRV records."}}
}
if len(nulls) == len(d.Records) {
return []sdk.CheckState{{Status: sdk.StatusWarn, Code: "srv_all_null",
Message: fmt.Sprintf("All %d SRV records use null target (\".\"): service explicitly disabled.", len(nulls))}}
}
return []sdk.CheckState{{Status: sdk.StatusInfo, Code: "srv_some_null",
Message: fmt.Sprintf("%d record(s) have null target: %s", len(nulls), strings.Join(nulls, ", "))}}
}

67
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// 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"
)
// Port 0 is valid on the wire but no client can connect to it; null targets are exempt since their port is irrelevant.
type rulePortValid struct{}
func RulePortValid() sdk.CheckRule { return &rulePortValid{} }
func (rulePortValid) Name() string { return "srv_port_valid" }
func (rulePortValid) Description() string {
return "SRV records advertise a non-zero port that clients can actually connect to."
}
func (rulePortValid) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
d, cs := getData(ctx, obs)
if cs != nil {
return []sdk.CheckState{*cs}
}
var bad []string
var checked int
for _, r := range d.Records {
if r.IsNullTarget {
continue
}
checked++
if r.Port == 0 {
bad = append(bad, fmt.Sprintf("%s (port %d)", r.Owner, r.Port))
}
}
if checked == 0 {
return []sdk.CheckState{{Status: sdk.StatusInfo, Code: "srv_port_na",
Message: "No active SRV targets to check ports on."}}
}
if len(bad) == 0 {
return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_port_ok",
Message: fmt.Sprintf("All %d SRV record(s) advertise a non-zero port.", checked)}}
}
return []sdk.CheckState{{Status: sdk.StatusCrit, Code: "srv_port_zero",
Message: fmt.Sprintf("SRV record(s) advertise port 0: %s", strings.Join(bad, ", "))}}
}

49
checker/rules_present.go Normal file
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// 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"
sdk "git.happydns.org/checker-sdk-go/checker"
)
type rulePresent struct{}
func RulePresent() sdk.CheckRule { return &rulePresent{} }
func (rulePresent) Name() string { return "srv_records_present" }
func (rulePresent) Description() string {
return "At least one SRV record is published for this service."
}
func (rulePresent) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
d, cs := getData(ctx, obs)
if cs != nil {
return []sdk.CheckState{*cs}
}
if len(d.Records) == 0 {
return []sdk.CheckState{{Status: sdk.StatusCrit, Code: "srv_missing",
Message: "No SRV records published."}}
}
return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_present",
Message: fmt.Sprintf("%d SRV record(s) published.", len(d.Records))}}
}

107
checker/rules_priority_weight.go Normal file
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// 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"
)
// Single-priority with multiple targets is Info (not Warn) because it is legal; all-zero-weight within a group is Warn because it almost always indicates a misconfiguration.
type rulePriorityWeightSanity struct{}
func RulePriorityWeightSanity() sdk.CheckRule { return &rulePriorityWeightSanity{} }
func (rulePriorityWeightSanity) Name() string { return "srv_priority_weight_sanity" }
func (rulePriorityWeightSanity) Description() string {
return "Priority/weight values follow RFC 2782 conventions (failover present, weights meaningful)."
}
func (rulePriorityWeightSanity) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
d, cs := getData(ctx, obs)
if cs != nil {
return []sdk.CheckState{*cs}
}
type groupKey struct{ owner string }
type group struct {
priorities map[uint16]int
zeroWeight map[uint16]int
}
groups := map[groupKey]*group{}
for _, r := range d.Records {
if r.IsNullTarget {
continue
}
k := groupKey{owner: r.Owner}
g := groups[k]
if g == nil {
g = &group{priorities: map[uint16]int{}, zeroWeight: map[uint16]int{}}
groups[k] = g
}
g.priorities[r.Priority]++
if r.Weight == 0 {
g.zeroWeight[r.Priority]++
}
}
if len(groups) == 0 {
return []sdk.CheckState{{Status: sdk.StatusInfo, Code: "srv_prio_weight_na",
Message: "No active SRV records to analyse."}}
}
var noFailover []string
var zeroWeightGroups []string
for k, g := range groups {
if len(g.priorities) < 2 {
total := 0
for _, c := range g.priorities {
total += c
}
if total > 1 {
noFailover = append(noFailover, k.owner)
}
}
for prio, zc := range g.zeroWeight {
if zc > 1 && zc == g.priorities[prio] {
zeroWeightGroups = append(zeroWeightGroups, fmt.Sprintf("%s@prio=%d", k.owner, prio))
}
}
}
var out []sdk.CheckState
if len(zeroWeightGroups) > 0 {
out = append(out, sdk.CheckState{Status: sdk.StatusWarn, Code: "srv_weight_all_zero",
Message: fmt.Sprintf("Priority group(s) with multiple targets all weighted 0: %s", strings.Join(zeroWeightGroups, ", "))})
}
if len(noFailover) > 0 {
out = append(out, sdk.CheckState{Status: sdk.StatusInfo, Code: "srv_single_priority",
Message: fmt.Sprintf("Service(s) with multiple records but a single priority tier (no failover): %s", strings.Join(noFailover, ", "))})
}
if len(out) == 0 {
out = append(out, sdk.CheckState{Status: sdk.StatusOK, Code: "srv_prio_weight_ok",
Message: "Priority and weight values are consistent with RFC 2782 conventions."})
}
return out
}

84
checker/rules_reachable.go Normal file
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@ -0,0 +1,84 @@
// 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"
)
type ruleTCPReachable struct{}
func RuleTCPReachable() sdk.CheckRule { return &ruleTCPReachable{} }
func (ruleTCPReachable) Name() string { return "srv_tcp_reachable" }
func (ruleTCPReachable) Description() string {
return "Every TCP SRV target:port accepts a TCP connection."
}
func (ruleTCPReachable) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
d, cs := getData(ctx, obs)
if cs != nil {
return []sdk.CheckState{*cs}
}
total, ok, failed := countProbeResults(d, protoTCP)
if total == 0 {
return []sdk.CheckState{{Status: sdk.StatusUnknown, Code: "srv_tcp_na",
Message: "No TCP targets to test."}}
}
if ok == total {
return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_tcp_ok",
Message: fmt.Sprintf("All %d TCP target(s) reachable.", total)}}
}
if ok == 0 {
return []sdk.CheckState{{Status: sdk.StatusCrit, Code: "srv_tcp_all_down",
Message: fmt.Sprintf("All %d TCP target(s) unreachable: %s", total, strings.Join(failed, "; "))}}
}
return []sdk.CheckState{{Status: sdk.StatusWarn, Code: "srv_tcp_partial",
Message: fmt.Sprintf("%d/%d TCP target(s) unreachable: %s", total-ok, total, strings.Join(failed, "; "))}}
}
type ruleUDPReachable struct{}
func RuleUDPReachable() sdk.CheckRule { return &ruleUDPReachable{} }
func (ruleUDPReachable) Name() string { return "srv_udp_reachable" }
func (ruleUDPReachable) Description() string {
return "UDP SRV targets do not return ICMP port-unreachable."
}
func (ruleUDPReachable) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
d, cs := getData(ctx, obs)
if cs != nil {
return []sdk.CheckState{*cs}
}
total, ok, failed := countProbeResults(d, protoUDP)
if total == 0 {
return []sdk.CheckState{{Status: sdk.StatusUnknown, Code: "srv_udp_na",
Message: "No UDP targets to test."}}
}
if ok == total {
return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_udp_ok",
Message: fmt.Sprintf("All %d UDP target(s) reachable.", total)}}
}
return []sdk.CheckState{{Status: sdk.StatusWarn, Code: "srv_udp_issue",
Message: fmt.Sprintf("%d/%d UDP target(s) reported port unreachable: %s", total-ok, total, strings.Join(failed, "; "))}}
}

60
checker/rules_redundancy.go Normal file
View file

@ -0,0 +1,60 @@
// 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"
sdk "git.happydns.org/checker-sdk-go/checker"
)
type ruleRedundancy struct{}
func RuleRedundancy() sdk.CheckRule { return &ruleRedundancy{} }
func (ruleRedundancy) Name() string { return "srv_redundancy" }
func (ruleRedundancy) Description() string {
return "At least two distinct SRV targets exist (avoids single point of failure)."
}
func (ruleRedundancy) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
d, cs := getData(ctx, obs)
if cs != nil {
return []sdk.CheckState{*cs}
}
targets := map[string]bool{}
for _, r := range d.Records {
if r.IsNullTarget {
continue
}
targets[r.Target] = true
}
if len(targets) >= 2 {
return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_redundant",
Message: fmt.Sprintf("%d distinct targets.", len(targets))}}
}
if len(targets) == 1 {
return []sdk.CheckState{{Status: sdk.StatusInfo, Code: "srv_single_target",
Message: "Single SRV target: no redundancy at DNS level."}}
}
return []sdk.CheckState{{Status: sdk.StatusUnknown, Code: "srv_no_targets_redundancy",
Message: "No usable SRV targets."}}
}

65
checker/rules_resolve.go Normal file
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@ -0,0 +1,65 @@
// 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"
)
type ruleTargetsResolve struct{}
func RuleTargetsResolve() sdk.CheckRule { return &ruleTargetsResolve{} }
func (ruleTargetsResolve) Name() string { return "srv_targets_resolve" }
func (ruleTargetsResolve) Description() string {
return "Every SRV target resolves to at least one A/AAAA address."
}
func (ruleTargetsResolve) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
d, cs := getData(ctx, obs)
if cs != nil {
return []sdk.CheckState{*cs}
}
var failed []string
var checked int
for _, r := range d.Records {
if r.IsNullTarget {
continue
}
checked++
if len(r.Addresses) == 0 {
failed = append(failed, fmt.Sprintf("%s (%s)", r.Target, r.ResolveError))
}
}
if checked == 0 {
return []sdk.CheckState{{Status: sdk.StatusUnknown, Code: "srv_no_targets",
Message: "No resolvable targets to test."}}
}
if len(failed) == 0 {
return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_all_resolve",
Message: fmt.Sprintf("All %d target(s) resolve.", checked)}}
}
return []sdk.CheckState{{Status: sdk.StatusCrit, Code: "srv_resolve_fail",
Message: fmt.Sprintf("Target(s) failed DNS resolution: %s", strings.Join(failed, "; "))}}
}

73
checker/types.go Normal file
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@ -0,0 +1,73 @@
// 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 implements the generic SRV records checker for happyDomain.
//
// TLS/certificate testing is intentionally out of scope: it is handled by a
// dedicated TLS checker.
package checker
import (
sdk "git.happydns.org/checker-sdk-go/checker"
)
const ObservationKeySRV sdk.ObservationKey = "srv_records"
const (
protoTCP = "tcp"
protoUDP = "udp"
)
type SRVRecord struct {
Service string `json:"service"`
Proto string `json:"proto"`
Owner string `json:"owner"`
Target string `json:"target"`
Port uint16 `json:"port"`
Priority uint16 `json:"priority"`
Weight uint16 `json:"weight"`
IsNullTarget bool `json:"isNullTarget,omitempty"` // target == "." means "no service"
IsCNAME bool `json:"isCNAME,omitempty"` // RFC 2782: MUST NOT be CNAME
CNAMEChain []string `json:"cnameChain,omitempty"`
Addresses []string `json:"addresses,omitempty"`
ResolveError string `json:"resolveError,omitempty"`
Probes []ProbeResult `json:"probes,omitempty"`
}
type ProbeResult struct {
Address string `json:"address"`
Proto string `json:"proto"`
// Connected reports whether the probe should be treated as reachable.
// For TCP this is a true handshake. For UDP, where silent drops are
// indistinguishable from a working service, a timeout also sets
// Connected=true and populates Error with an explanatory note: the
// rule treats "no ICMP unreachable" as best-effort reachable.
Connected bool `json:"connected"`
LatencyMs float64 `json:"latencyMs,omitempty"`
Error string `json:"error,omitempty"`
}
type SRVData struct {
ServiceDomain string `json:"serviceDomain"`
Records []SRVRecord `json:"records"`
}

46
go.mod Normal file
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@ -0,0 +1,46 @@
module git.happydns.org/checker-srv
go 1.25.0
require (
git.happydns.org/checker-sdk-go v1.5.0
git.happydns.org/checker-tls v0.6.2
git.happydns.org/happyDomain v0.7.0
)
require (
github.com/bytedance/gopkg v0.1.3 // indirect
github.com/bytedance/sonic v1.15.0 // indirect
github.com/bytedance/sonic/loader v0.5.0 // indirect
github.com/cloudwego/base64x v0.1.6 // indirect
github.com/gabriel-vasile/mimetype v1.4.13 // indirect
github.com/gin-contrib/sse v1.1.0 // indirect
github.com/gin-gonic/gin v1.12.0 // indirect
github.com/go-playground/locales v0.14.1 // indirect
github.com/go-playground/universal-translator v0.18.1 // indirect
github.com/go-playground/validator/v10 v10.30.1 // indirect
github.com/goccy/go-json v0.10.5 // indirect
github.com/goccy/go-yaml v1.19.2 // indirect
github.com/json-iterator/go v1.1.13-0.20220915233716-71ac16282d12 // indirect
github.com/klauspost/cpuid/v2 v2.3.0 // indirect
github.com/leodido/go-urn v1.4.0 // indirect
github.com/mattn/go-isatty v0.0.20 // indirect
github.com/miekg/dns v1.1.72 // indirect
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
github.com/modern-go/reflect2 v1.0.2 // indirect
github.com/pelletier/go-toml/v2 v2.2.4 // indirect
github.com/quic-go/qpack v0.6.0 // indirect
github.com/quic-go/quic-go v0.59.0 // indirect
github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
github.com/ugorji/go/codec v1.3.1 // indirect
go.mongodb.org/mongo-driver/v2 v2.5.0 // indirect
golang.org/x/arch v0.24.0 // indirect
golang.org/x/crypto v0.49.0 // indirect
golang.org/x/mod v0.33.0 // indirect
golang.org/x/net v0.51.0 // indirect
golang.org/x/sync v0.20.0 // indirect
golang.org/x/sys v0.42.0 // indirect
golang.org/x/text v0.35.0 // indirect
golang.org/x/tools v0.42.0 // indirect
google.golang.org/protobuf v1.36.11 // indirect
)

104
go.sum Normal file
View file

@ -0,0 +1,104 @@
git.happydns.org/checker-sdk-go v1.5.0 h1:5uD5Cm6xJ+lwnhbJ09iCXGHbYS9zRh+Yh0NeBHkAPBY=
git.happydns.org/checker-sdk-go v1.5.0/go.mod h1:aNAcfYFfbhvH9kJhE0Njp5GX0dQbxdRB0rJ0KvSC5nI=
git.happydns.org/checker-tls v0.6.2 h1:8oKia1XlD+tklyqrwzmUgFH1Kw8VLSLLF9suZ7Qr14E=
git.happydns.org/checker-tls v0.6.2/go.mod h1:9tpnxg0iOwS+7If64DRG1jqYonUAgxOBuxwfF5mVkL4=
git.happydns.org/happyDomain v0.7.0 h1:NV82/NbcSeRm0+IUZqaK3Vu9Ovl5+vv4AigUJZMdwws=
git.happydns.org/happyDomain v0.7.0/go.mod h1:5tgkmqFE65kK359rY49V++49wgZ0gco+Gh9X6tbL+bY=
github.com/bytedance/gopkg v0.1.3 h1:TPBSwH8RsouGCBcMBktLt1AymVo2TVsBVCY4b6TnZ/M=
github.com/bytedance/gopkg v0.1.3/go.mod h1:576VvJ+eJgyCzdjS+c4+77QF3p7ubbtiKARP3TxducM=
github.com/bytedance/sonic v1.15.0 h1:/PXeWFaR5ElNcVE84U0dOHjiMHQOwNIx3K4ymzh/uSE=
github.com/bytedance/sonic v1.15.0/go.mod h1:tFkWrPz0/CUCLEF4ri4UkHekCIcdnkqXw9VduqpJh0k=
github.com/bytedance/sonic/loader v0.5.0 h1:gXH3KVnatgY7loH5/TkeVyXPfESoqSBSBEiDd5VjlgE=
github.com/bytedance/sonic/loader v0.5.0/go.mod h1:AR4NYCk5DdzZizZ5djGqQ92eEhCCcdf5x77udYiSJRo=
github.com/cloudwego/base64x v0.1.6 h1:t11wG9AECkCDk5fMSoxmufanudBtJ+/HemLstXDLI2M=
github.com/cloudwego/base64x v0.1.6/go.mod h1:OFcloc187FXDaYHvrNIjxSe8ncn0OOM8gEHfghB2IPU=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/gabriel-vasile/mimetype v1.4.13 h1:46nXokslUBsAJE/wMsp5gtO500a4F3Nkz9Ufpk2AcUM=
github.com/gabriel-vasile/mimetype v1.4.13/go.mod h1:d+9Oxyo1wTzWdyVUPMmXFvp4F9tea18J8ufA774AB3s=
github.com/gin-contrib/sse v1.1.0 h1:n0w2GMuUpWDVp7qSpvze6fAu9iRxJY4Hmj6AmBOU05w=
github.com/gin-contrib/sse v1.1.0/go.mod h1:hxRZ5gVpWMT7Z0B0gSNYqqsSCNIJMjzvm6fqCz9vjwM=
github.com/gin-gonic/gin v1.12.0 h1:b3YAbrZtnf8N//yjKeU2+MQsh2mY5htkZidOM7O0wG8=
github.com/gin-gonic/gin v1.12.0/go.mod h1:VxccKfsSllpKshkBWgVgRniFFAzFb9csfngsqANjnLc=
github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
github.com/go-playground/validator/v10 v10.30.1 h1:f3zDSN/zOma+w6+1Wswgd9fLkdwy06ntQJp0BBvFG0w=
github.com/go-playground/validator/v10 v10.30.1/go.mod h1:oSuBIQzuJxL//3MelwSLD5hc2Tu889bF0Idm9Dg26cM=
github.com/goccy/go-json v0.10.5 h1:Fq85nIqj+gXn/S5ahsiTlK3TmC85qgirsdTP/+DeaC4=
github.com/goccy/go-json v0.10.5/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
github.com/goccy/go-yaml v1.19.2 h1:PmFC1S6h8ljIz6gMRBopkjP1TVT7xuwrButHID66PoM=
github.com/goccy/go-yaml v1.19.2/go.mod h1:XBurs7gK8ATbW4ZPGKgcbrY1Br56PdM69F7LkFRi1kA=
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
github.com/json-iterator/go v1.1.13-0.20220915233716-71ac16282d12 h1:9Nu54bhS/H/Kgo2/7xNSUuC5G28VR8ljfrLKU2G4IjU=
github.com/json-iterator/go v1.1.13-0.20220915233716-71ac16282d12/go.mod h1:TBzl5BIHNXfS9+C35ZyJaklL7mLDbgUkcgXzSLa8Tk0=
github.com/klauspost/cpuid/v2 v2.3.0 h1:S4CRMLnYUhGeDFDqkGriYKdfoFlDnMtqTiI/sFzhA9Y=
github.com/klauspost/cpuid/v2 v2.3.0/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
github.com/miekg/dns v1.1.72 h1:vhmr+TF2A3tuoGNkLDFK9zi36F2LS+hKTRW0Uf8kbzI=
github.com/miekg/dns v1.1.72/go.mod h1:+EuEPhdHOsfk6Wk5TT2CzssZdqkmFhf8r+aVyDEToIs=
github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/quic-go/qpack v0.6.0 h1:g7W+BMYynC1LbYLSqRt8PBg5Tgwxn214ZZR34VIOjz8=
github.com/quic-go/qpack v0.6.0/go.mod h1:lUpLKChi8njB4ty2bFLX2x4gzDqXwUpaO1DP9qMDZII=
github.com/quic-go/quic-go v0.59.0 h1:OLJkp1Mlm/aS7dpKgTc6cnpynnD2Xg7C1pwL6vy/SAw=
github.com/quic-go/quic-go v0.59.0/go.mod h1:upnsH4Ju1YkqpLXC305eW3yDZ4NfnNbmQRCMWS58IKU=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS4MhqMhdFk5YI=
github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
github.com/ugorji/go/codec v1.3.1 h1:waO7eEiFDwidsBN6agj1vJQ4AG7lh2yqXyOXqhgQuyY=
github.com/ugorji/go/codec v1.3.1/go.mod h1:pRBVtBSKl77K30Bv8R2P+cLSGaTtex6fsA2Wjqmfxj4=
go.mongodb.org/mongo-driver/v2 v2.5.0 h1:yXUhImUjjAInNcpTcAlPHiT7bIXhshCTL3jVBkF3xaE=
go.mongodb.org/mongo-driver/v2 v2.5.0/go.mod h1:yOI9kBsufol30iFsl1slpdq1I0eHPzybRWdyYUs8K/0=
go.uber.org/mock v0.6.0 h1:hyF9dfmbgIX5EfOdasqLsWD6xqpNZlXblLB/Dbnwv3Y=
go.uber.org/mock v0.6.0/go.mod h1:KiVJ4BqZJaMj4svdfmHM0AUx4NJYO8ZNpPnZn1Z+BBU=
golang.org/x/arch v0.24.0 h1:qlJ3M9upxvFfwRM51tTg3Yl+8CP9vCC1E7vlFpgv99Y=
golang.org/x/arch v0.24.0/go.mod h1:dNHoOeKiyja7GTvF9NJS1l3Z2yntpQNzgrjh1cU103A=
golang.org/x/crypto v0.49.0 h1:+Ng2ULVvLHnJ/ZFEq4KdcDd/cfjrrjjNSXNzxg0Y4U4=
golang.org/x/crypto v0.49.0/go.mod h1:ErX4dUh2UM+CFYiXZRTcMpEcN8b/1gxEuv3nODoYtCA=
golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=
golang.org/x/mod v0.33.0/go.mod h1:swjeQEj+6r7fODbD2cqrnje9PnziFuw4bmLbBZFrQ5w=
golang.org/x/net v0.51.0 h1:94R/GTO7mt3/4wIKpcR5gkGmRLOuE/2hNGeWq/GBIFo=
golang.org/x/net v0.51.0/go.mod h1:aamm+2QF5ogm02fjy5Bb7CQ0WMt1/WVM7FtyaTLlA9Y=
golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=
google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

45
main.go Normal file
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// 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/>.
// Command checker-srv is the standalone binary for the SRV checker.
package main
import (
"flag"
"log"
"git.happydns.org/checker-sdk-go/checker/server"
srv "git.happydns.org/checker-srv/checker"
)
var Version = "custom-build"
var listenAddr = flag.String("listen", ":8080", "HTTP listen address")
func main() {
flag.Parse()
srv.Version = Version
httpSrv := server.New(srv.Provider())
if err := httpSrv.ListenAndServe(*listenAddr); err != nil {
log.Fatalf("server error: %v", err)
}
}

36
plugin/plugin.go Normal file
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// 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/>.
// Command plugin is the happyDomain plugin entrypoint for the SRV checker.
package main
import (
sdk "git.happydns.org/checker-sdk-go/checker"
srv "git.happydns.org/checker-srv/checker"
)
var Version = "custom-build"
func NewCheckerPlugin() (*sdk.CheckerDefinition, sdk.ObservationProvider, error) {
srv.Version = Version
prvd := srv.Provider()
return prvd.(sdk.CheckerDefinitionProvider).Definition(), prvd, nil
}