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219bfd0493
* middleware/metrics: add more metrics middleware/cache: Add metrics for number of elements in the cache. Also export the total size. Update README to detail the new metrics. middleware/metrics Move metrics into subpackage called "vars". This breaks the import cycle and is cleaner. This allows vars.Report to be used in the the dnsserver to log refused queries. middleware/metrics: tests Add tests to the metrics framework. The metrics/test subpackage allows scraping of the local server. Do a few test scrape of the metrics that are defined in the metrics middleware. This also allows metrics integration tests to check if the caching and dnssec middleware export their metrics correctly. * update README * typos * fix tests
62 lines
1.5 KiB
Go
62 lines
1.5 KiB
Go
// Package chaos implements a middleware that answer to 'CH version.bind TXT' type queries.
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package chaos
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import (
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"os"
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"github.com/miekg/coredns/middleware"
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"github.com/miekg/coredns/request"
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"github.com/miekg/dns"
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"golang.org/x/net/context"
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)
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// Chaos allows CoreDNS to reply to CH TXT queries and return author or
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// version information.
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type Chaos struct {
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Next middleware.Handler
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Version string
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Authors map[string]bool
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}
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// ServeDNS implements the middleware.Handler interface.
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func (c Chaos) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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state := request.Request{W: w, Req: r}
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if state.QClass() != dns.ClassCHAOS || state.QType() != dns.TypeTXT {
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return c.Next.ServeDNS(ctx, w, r)
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}
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m := new(dns.Msg)
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m.SetReply(r)
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hdr := dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeTXT, Class: dns.ClassCHAOS, Ttl: 0}
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switch state.Name() {
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default:
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return c.Next.ServeDNS(ctx, w, r)
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case "authors.bind.":
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for a := range c.Authors {
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m.Answer = append(m.Answer, &dns.TXT{Hdr: hdr, Txt: []string{trim(a)}})
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}
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case "version.bind.", "version.server.":
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m.Answer = []dns.RR{&dns.TXT{Hdr: hdr, Txt: []string{trim(c.Version)}}}
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case "hostname.bind.", "id.server.":
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hostname, err := os.Hostname()
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if err != nil {
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hostname = "localhost"
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}
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m.Answer = []dns.RR{&dns.TXT{Hdr: hdr, Txt: []string{trim(hostname)}}}
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}
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state.SizeAndDo(m)
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w.WriteMsg(m)
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return 0, nil
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}
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func (c Chaos) Name() string { return "chaos" }
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func trim(s string) string {
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if len(s) < 256 {
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return s
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}
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return s[:255]
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}
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