82 lines
1.9 KiB
Go
82 lines
1.9 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Binary radvd sends IPv6 router advertisements.
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package main
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import (
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"encoding/json"
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"flag"
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"io/ioutil"
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"log"
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"net"
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"os"
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"os/signal"
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"path"
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"syscall"
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"github.com/rtr7/router7/internal/dhcp6"
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"github.com/rtr7/router7/internal/radvd"
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)
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var perm = flag.String("perm", "/perm", "path to replace /perm")
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func logic() error {
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srv, err := radvd.NewServer()
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if err != nil {
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return err
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}
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readConfig := func() error {
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b, err := ioutil.ReadFile(path.Join(*perm, "/dhcp6/wire/lease.json"))
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if err != nil {
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return err
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}
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var cfg dhcp6.Config
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if err := json.Unmarshal(b, &cfg); err != nil {
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return err
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}
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var additional []net.IPNet
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if b, err := ioutil.ReadFile(path.Join(*perm, "/radvd/prefixes.json")); err == nil {
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if err := json.Unmarshal(b, &additional); err != nil {
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return err
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}
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}
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srv.SetPrefixes(append(cfg.Prefixes, additional...))
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return nil
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}
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if err := readConfig(); err != nil {
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log.Printf("cannot announce IPv6 prefixes: %v", err)
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}
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ch := make(chan os.Signal, 1)
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signal.Notify(ch, syscall.SIGUSR1)
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go func() {
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for range ch {
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if err := readConfig(); err != nil {
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log.Printf("readConfig: %v", err)
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}
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}
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}()
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return srv.ListenAndServe("lan0")
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}
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func main() {
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// TODO: drop privileges, run as separate uid?
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flag.Parse()
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if err := logic(); err != nil {
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log.Fatal(err)
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}
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}
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