53 lines
1.1 KiB
Go
53 lines
1.1 KiB
Go
package dnstest
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import (
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"net"
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"github.com/miekg/dns"
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)
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// A Server is an DNS server listening on a system-chosen port on the local
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// loopback interface, for use in end-to-end DNS tests.
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type Server struct {
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Addr string // Address where the server listening.
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s1 *dns.Server // udp
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s2 *dns.Server // tcp
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}
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// NewServer starts and returns a new Server. The caller should call Close when
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// finished, to shut it down.
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func NewServer(f dns.HandlerFunc) *Server {
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dns.HandleFunc(".", f)
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ch1 := make(chan bool)
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ch2 := make(chan bool)
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l, _ := net.Listen("tcp", ":0")
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if l == nil {
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return nil
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}
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p, _ := net.ListenPacket("udp", l.Addr().String())
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if p == nil {
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l.Close()
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return nil // yes, this may crash some test, but this is better than hanging
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}
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s1 := &dns.Server{PacketConn: p}
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s2 := &dns.Server{Listener: l}
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s1.NotifyStartedFunc = func() { close(ch1) }
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s2.NotifyStartedFunc = func() { close(ch2) }
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go s1.ActivateAndServe()
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go s2.ActivateAndServe()
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<-ch1
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<-ch2
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return &Server{s1: s1, s2: s2, Addr: p.LocalAddr().String()}
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}
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// Close shuts down the server.
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func (s *Server) Close() {
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s.s1.Shutdown()
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s.s2.Shutdown()
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}
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