89 lines
2.0 KiB
Go
89 lines
2.0 KiB
Go
package synthetic
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import (
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"fmt"
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"github.com/coredns/caddy"
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"github.com/coredns/coredns/core/dnsserver"
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"github.com/coredns/coredns/plugin"
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"net"
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"strconv"
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"strings"
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)
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// syntheticConfig holds the configuration options for the synthetic plugin.
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type syntheticConfig struct {
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net []*net.IPNet
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forward string
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ttl uint32
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prefix string
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}
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// init registers this plugin.
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func init() { plugin.Register("synthetic", setup) }
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// setup is the function that gets called when the config parser see the token "synthetic".
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func setup(c *caddy.Controller) error {
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var config syntheticConfig
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// Parse the configuration file
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for c.Next() {
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for c.NextBlock() {
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switch v := c.Val(); v {
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// Configuration for forward lookup zones for which to do resolution
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case "net":
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args := c.RemainingArgs()
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for _, arg := range args {
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_, cidr, err := net.ParseCIDR(arg)
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if err == nil {
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config.net = append(config.net, cidr)
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} else {
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return fmt.Errorf("synthetic: invalid reverse lookup cidr: %v", arg)
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}
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}
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// Configuration for reverse lookup zones for the forward lookup zone name
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case "forward":
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args := c.RemainingArgs()
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for _, arg := range args {
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config.forward = arg
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}
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// Configuration for the TTL value
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case "ttl":
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args := c.RemainingArgs()
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for _, arg := range args {
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ttl64, err := strconv.ParseUint(arg, 10, 32)
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if err != nil {
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return fmt.Errorf("synthetic: invalid ttl value: %v", arg)
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}
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config.ttl = uint32(ttl64)
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}
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// configuration for the prefix value (defaults to `ip`)
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case "prefix":
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args := c.RemainingArgs()
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for _, arg := range args {
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config.prefix = arg
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}
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default:
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return c.Errf("unknown property '%s'", v)
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}
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}
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}
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if config.prefix == "" {
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config.prefix = "ip"
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}
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if !strings.HasSuffix(config.prefix, "-") {
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config.prefix = config.prefix + "-"
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}
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dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
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return synthetic{Next: next, Config: config}
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})
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return nil
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}
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