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server.go
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server.go
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package main
import (
"crypto/tls"
"time"
"github.com/miekg/dns"
"github.com/semihalev/log"
)
// Server type
type Server struct {
host string
tlsHost string
tlsCertificate string
tlsPrivateKey string
rTimeout time.Duration
wTimeout time.Duration
}
// Run starts the server
func (s *Server) Run() {
handler := NewHandler()
tcpHandler := dns.NewServeMux()
tcpHandler.HandleFunc(".", handler.TCP)
udpHandler := dns.NewServeMux()
udpHandler.HandleFunc(".", handler.UDP)
tcpServer := &dns.Server{
Addr: s.host,
Net: "tcp",
Handler: tcpHandler,
ReadTimeout: s.rTimeout,
WriteTimeout: s.wTimeout,
ReusePort: true,
}
udpServer := &dns.Server{
Addr: s.host,
Net: "udp",
Handler: udpHandler,
UDPSize: dns.DefaultMsgSize,
ReadTimeout: s.rTimeout,
WriteTimeout: s.wTimeout,
ReusePort: true,
}
go s.start(udpServer)
go s.start(tcpServer)
if s.tlsHost != "" {
cert, err := tls.LoadX509KeyPair(s.tlsCertificate, s.tlsPrivateKey)
if err != nil {
log.Crit("TLS certificate load failed", "error", err.Error())
return
}
tlsServer := &dns.Server{
Addr: s.tlsHost,
Net: "tcp-tls",
TLSConfig: &tls.Config{Certificates: []tls.Certificate{cert}},
Handler: tcpHandler,
ReadTimeout: s.rTimeout,
WriteTimeout: s.wTimeout,
}
go s.start(tlsServer)
}
}
func (s *Server) start(ds *dns.Server) {
log.Info("DNS server listening...", "net", ds.Net, "addr", ds.Addr)
if err := ds.ListenAndServe(); err != nil {
log.Crit("DNS listener failed", "net", ds.Net, "addr", ds.Addr, "error", err.Error())
}
}