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Treat resolver transport failures as inconclusive checks so they do not open outage alerts.
63 строки
1.3 KiB
Go
63 строки
1.3 KiB
Go
package cdns
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import (
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"net"
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"os"
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"strings"
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"time"
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"github.com/miekg/dns"
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)
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// DNS check configuration constants.
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const (
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// Timeout is the DNS query timeout in seconds.
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Timeout float64 = float64(1.5)
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MaxTrials uint = 3
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MaxNameservers uint = 20
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MaxAddresses uint = 10
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EdnsbufferSize uint16 = 4096
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)
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var (
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conf *dns.ClientConfig
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debug = false
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maxTrials = 3
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v4only = true
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v6only = false
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bufsize = EdnsbufferSize
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timeout = time.Duration(float64(Timeout) * float64(time.Second))
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noedns = false
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recursion = false
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tcp = false
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noauthrequired = false
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nodnssec = false
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)
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func init() {
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conf = &dns.ClientConfig{
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Servers: resolversFromEnv(),
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Port: "53",
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}
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}
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func resolversFromEnv() []string {
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const defaults = "188.93.17.19,188.93.16.19,82.117.245.122"
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resolvers := strings.Split(os.Getenv("RSMON_DNS_RESOLVERS"), ",")
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if strings.TrimSpace(os.Getenv("RSMON_DNS_RESOLVERS")) == "" {
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resolvers = strings.Split(defaults, ",")
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}
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valid := make([]string, 0, len(resolvers))
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for _, resolver := range resolvers {
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resolver = strings.TrimSpace(resolver)
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if net.ParseIP(resolver) != nil {
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valid = append(valid, resolver)
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}
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}
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if len(valid) == 0 {
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return strings.Split(defaults, ",")
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}
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return valid
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}
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