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package bind
import (
"errors"
"fmt"
"net"
"github.com/coredns/caddy"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
)
func setup(c *caddy.Controller) error {
config := dnsserver.GetConfig(c)
// addresses will be consolidated over all BIND directives available in that BlocServer
all := []string{}
ifaces, err := net.Interfaces()
if err != nil {
return plugin.Error("bind", fmt.Errorf("failed to get interfaces list: %s", err))
}
for c.Next() {
b, err := parse(c)
if err != nil {
return plugin.Error("bind", err)
}
ips, err := listIP(b.addrs, ifaces)
if err != nil {
return plugin.Error("bind", err)
}
except, err := listIP(b.except, ifaces)
if err != nil {
return plugin.Error("bind", err)
}
for _, ip := range ips {
if !isIn(ip, except) {
all = append(all, ip)
}
}
}
config.ListenHosts = all
return nil
}
func parse(c *caddy.Controller) (*bind, error) {
b := &bind{}
b.addrs = c.RemainingArgs()
if len(b.addrs) == 0 {
return nil, errors.New("at least one address or interface name is expected")
}
for c.NextBlock() {
switch c.Val() {
case "except":
b.except = c.RemainingArgs()
if len(b.except) == 0 {
return nil, errors.New("at least one address or interface must be given to except subdirective")
}
default:
return nil, fmt.Errorf("invalid option %q", c.Val())
}
}
return b, nil
}
// listIP returns a list of IP addresses from a list of arguments which can be either IP-Address or Interface-Name.
func listIP(args []string, ifaces []net.Interface) ([]string, error) {
all := []string{}
var isIface bool
for _, a := range args {
isIface = false
for _, iface := range ifaces {
if a == iface.Name {
isIface = true
addrs, err := iface.Addrs()
if err != nil {
return nil, fmt.Errorf("failed to get the IP addresses of the interface: %q", a)
}
for _, addr := range addrs {
if ipnet, ok := addr.(*net.IPNet); ok {
if ipnet.IP.To4() != nil || (!ipnet.IP.IsLinkLocalMulticast() && !ipnet.IP.IsLinkLocalUnicast()) {
all = append(all, ipnet.IP.String())
}
}
}
}
}
if !isIface {
if net.ParseIP(a) == nil {
return nil, fmt.Errorf("not a valid IP address or interface name: %q", a)
}
all = append(all, a)
}
}
return all, nil
}
// isIn checks if a string array contains an element
func isIn(s string, list []string) bool {
is := false
for _, l := range list {
if s == l {
is = true
}
}
return is
}
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