90 lines
1.6 KiB
Go
90 lines
1.6 KiB
Go
// Copyright 2011 Miek Gieben. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// DNS server implementation
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package dns
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import (
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"os"
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"net"
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)
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// For both -> logging
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func ServeUDP(l *net.UDPConn, f func(*Conn, *Msg)) os.Error {
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for {
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m := make([]byte, DefaultMsgSize)
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n, addr, e := l.ReadFromUDP(m)
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if e != nil {
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continue
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}
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m = m[:n]
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d := new(Conn)
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d.UDP = l
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d.Addr = addr
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msg := new(Msg)
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if !msg.Unpack(m) {
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continue
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}
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go f(d, msg)
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}
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panic("not reached")
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}
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func ServeTCP(l *net.TCPListener, f func(*Conn, *Msg)) os.Error {
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for {
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c, e := l.AcceptTCP()
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if e != nil {
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return e
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}
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d := new(Conn)
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d.TCP = c
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d.Addr = c.RemoteAddr()
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m := make([]byte, MaxMsgSize) // This may start to hurt someday.
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n, e := d.Read(m)
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if e != nil {
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continue
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}
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m = m[:n]
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msg := new(Msg)
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if !msg.Unpack(m) {
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// Logging??
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continue
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}
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go f(d, msg)
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}
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panic("not reached")
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}
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func ListenAndServeTCP(addr string, f func(*Conn, *Msg)) os.Error {
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a, err := net.ResolveTCPAddr(addr)
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if err != nil {
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return err
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}
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l, err := net.ListenTCP("tcp", a)
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if err != nil {
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return err
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}
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err = ServeTCP(l, f)
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return err
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}
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func ListenAndServeUDP(addr string, f func(*Conn, *Msg)) os.Error {
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a, err := net.ResolveUDPAddr(addr)
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if err != nil {
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return err
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}
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l, err := net.ListenUDP("udp", a)
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if err != nil {
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return err
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}
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err = ServeUDP(l, f)
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return err
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}
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