Pierre-Olivier Mercier
7e50f404a1
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.
28 lines
837 B
Go
28 lines
837 B
Go
package checker
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import (
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"context"
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"fmt"
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sdk "git.happydns.org/checker-sdk-go/checker"
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)
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type rulePresent struct{}
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func RulePresent() sdk.CheckRule { return &rulePresent{} }
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func (rulePresent) Name() string { return "srv_records_present" }
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func (rulePresent) Description() string {
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return "At least one SRV record is published for this service."
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}
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func (rulePresent) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
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d, cs := getData(ctx, obs)
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if cs != nil {
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return []sdk.CheckState{*cs}
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}
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if len(d.Records) == 0 {
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return []sdk.CheckState{{Status: sdk.StatusCrit, Code: "srv_missing",
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Message: "No SRV records published."}}
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}
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return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_present",
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Message: fmt.Sprintf("%d SRV record(s) published.", len(d.Records))}}
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}
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