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server.go
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server.go
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// Copyright (C) 2020, IrineSistiana
//
// This file is part of mosdns.
//
// mosdns is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// mosdns is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package plainserver
import (
"errors"
"fmt"
"github.com/IrineSistiana/mosdns/dispatcher/handler"
"github.com/IrineSistiana/mosdns/dispatcher/mlog"
"github.com/IrineSistiana/mosdns/dispatcher/utils"
"github.com/sirupsen/logrus"
"io"
"net"
)
const PluginType = "plain_server"
func init() {
handler.RegInitFunc(PluginType, Init)
}
type plainServerPlugin struct {
tag string
logger *logrus.Entry
args *Args
shutdownChan chan struct{}
startedListener []io.Closer
}
func (s *plainServerPlugin) Tag() string {
return s.tag
}
func (s *plainServerPlugin) Type() string {
return PluginType
}
type Args struct {
Listen []string `yaml:"listen"`
Entry string `yaml:"entry"`
}
func Init(tag string, argsMap map[string]interface{}) (p handler.Plugin, err error) {
args := new(Args)
err = handler.WeakDecode(argsMap, args)
if err != nil {
return nil, handler.NewErrFromTemplate(handler.ETInvalidArgs, err)
}
if len(args.Listen) == 0 {
return nil, errors.New("no address to listen")
}
if len(args.Entry) == 0 {
return nil, errors.New("empty entry")
}
sp := &plainServerPlugin{
tag: tag,
logger: mlog.NewPluginLogger(tag),
args: args,
shutdownChan: make(chan struct{}),
}
h := &handler.DefaultServerHandler{
Logger: sp.logger,
Entry: sp.args.Entry,
}
server := &singleServer{
logger: sp.logger,
shutdownChan: sp.shutdownChan,
}
for _, addr := range args.Listen {
protocol, host := utils.ParseAddr(addr)
addr = utils.TryAddPort(host, 53)
switch protocol {
case "", "udp":
l, err := net.ListenPacket("udp", addr)
if err != nil {
sp.shutDown()
return nil, err
}
sp.startedListener = append(sp.startedListener, l)
sp.logger.Infof("udp server started at %s", l.LocalAddr())
go func() {
if err := server.serveUDP(l, h); err != nil {
handler.PluginFatalErr(tag, fmt.Sprintf("udp server %s exited: %v", l.LocalAddr(), err))
} else {
sp.logger.Infof("udp server %s exited", l.LocalAddr())
}
}()
case "tcp":
l, err := net.Listen("tcp", addr)
if err != nil {
sp.shutDown()
return nil, err
}
sp.startedListener = append(sp.startedListener, l)
sp.logger.Infof("tcp server started at %s", l.Addr())
go func() {
if err := server.serveTCP(l, h); err != nil {
handler.PluginFatalErr(tag, fmt.Sprintf("tcp server %s exited: %v", l.Addr(), err))
} else {
sp.logger.Infof("tcp server %s exited", l.Addr())
}
}()
default:
return nil, fmt.Errorf("unsupported protocol: %s", protocol)
}
}
return sp, nil
}
// shutDown closes all server listeners.
func (s *plainServerPlugin) shutDown() {
close(s.shutdownChan)
for _, l := range s.startedListener {
l.Close()
}
}
type singleServer struct {
logger *logrus.Entry
shutdownChan chan struct{}
}