Pierre-Olivier Mercier
cc500d9dc4
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.
75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
package checker
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import (
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"time"
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sdk "git.happydns.org/checker-sdk-go/checker"
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)
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var Version = "built-in"
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func Definition() *sdk.CheckerDefinition {
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return &sdk.CheckerDefinition{
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ID: "srv",
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Name: "SRV Records Tester",
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Version: Version,
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Availability: sdk.CheckerAvailability{
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ApplyToService: true,
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LimitToServices: []string{"svcs.UnknownSRV"},
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},
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HasHTMLReport: true,
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ObservationKeys: []sdk.ObservationKey{ObservationKeySRV},
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Options: sdk.CheckerOptionsDocumentation{
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UserOpts: []sdk.CheckerOptionDocumentation{
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{
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Id: "tcpTimeout",
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Type: "number",
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Label: "TCP connect timeout (ms)",
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Default: float64(3000),
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Description: "Max time to wait for a TCP handshake on each target.",
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},
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{
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Id: "udpTimeout",
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Type: "number",
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Label: "UDP probe timeout (ms)",
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Default: float64(2000),
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Description: "Max time to wait for a UDP response or ICMP unreachable.",
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},
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},
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ServiceOpts: []sdk.CheckerOptionDocumentation{
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{
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Id: "service",
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Label: "Service",
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AutoFill: sdk.AutoFillService,
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Hide: true,
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},
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{
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Id: "subdomain",
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Label: "Subdomain",
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AutoFill: sdk.AutoFillSubdomain,
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Hide: true,
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},
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{
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Id: "domain",
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Label: "Domain",
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AutoFill: sdk.AutoFillDomainName,
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Hide: true,
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},
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},
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},
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Rules: []sdk.CheckRule{
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RulePresent(),
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RuleNullTarget(),
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RuleTargetNotCNAME(),
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RuleTargetsResolve(),
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RuleTCPReachable(),
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RuleUDPReachable(),
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RuleRedundancy(),
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},
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Interval: &sdk.CheckIntervalSpec{
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Min: 5 * time.Minute,
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Max: 7 * 24 * time.Hour,
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Default: 6 * time.Hour,
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},
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}
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}
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