82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
package dns64
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import (
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"net"
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"github.com/coredns/coredns/core/dnsserver"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/plugin/pkg/dnsutil"
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"github.com/coredns/coredns/plugin/proxy"
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"github.com/mholt/caddy"
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)
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func init() {
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caddy.RegisterPlugin("dns64", caddy.Plugin{
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ServerType: "dns",
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Action: setup,
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})
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}
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func setup(c *caddy.Controller) error {
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prxy, pref, err := dns64Parse(c)
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if err != nil {
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return plugin.Error("dns64", err)
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}
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dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
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return DNS64{Next: next, Proxy: prxy, Prefix: pref}
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})
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return nil
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}
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func dns64Parse(c *caddy.Controller) (proxy.Proxy, *net.IPNet, error) {
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prxy := proxy.Proxy{}
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_, pref, _ := net.ParseCIDR("64:ff9b::/96")
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for c.Next() {
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args := c.RemainingArgs()
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if len(args) > 0 {
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return prxy, pref, c.ArgErr()
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}
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for c.NextBlock() {
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switch c.Val() {
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case "upstream":
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args := c.RemainingArgs()
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if len(args) == 0 {
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return prxy, pref, c.ArgErr()
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}
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ups, err := dnsutil.ParseHostPortOrFile(args...)
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if err != nil {
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return prxy, pref, err
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}
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prxy = proxy.NewLookup(ups)
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case "prefix":
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if !c.NextArg() {
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return prxy, pref, c.ArgErr()
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}
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_, pref, err := net.ParseCIDR(c.Val())
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// test for valid prefix
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n, total := pref.Mask.Size()
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if total != 128 {
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return prxy, pref, c.Errf("'%s' not a valid IPv6 address", pref)
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}
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if n%8 != 0 || n < 32 || n > 96 {
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return prxy, pref, c.Errf("'%s' not a valid prefix length", pref)
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}
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if err != nil {
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return prxy, pref, err
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}
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default:
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return prxy, pref, c.Errf("unknown property '%s'", c.Val())
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}
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}
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}
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return prxy, pref, nil
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}
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