mirror of
https://github.com/coredns/coredns.git
synced 2025-11-03 18:53:13 -05:00
31e285994b
Ignore invalid ServerBlockKeys in loop plugin that fail normalization. Retain the default “.” zone instead of indexing into an empty slice. This prevents an index-out-of-range panic triggered by malformed inputs such as "unix://". Added tests to validate and increase test coverage. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>
94 lines
1.8 KiB
Go
94 lines
1.8 KiB
Go
package loop
|
|
|
|
import (
|
|
"net"
|
|
"strconv"
|
|
"time"
|
|
|
|
"github.com/coredns/caddy"
|
|
"github.com/coredns/coredns/core/dnsserver"
|
|
"github.com/coredns/coredns/plugin"
|
|
"github.com/coredns/coredns/plugin/pkg/dnsutil"
|
|
"github.com/coredns/coredns/plugin/pkg/rand"
|
|
)
|
|
|
|
func init() { plugin.Register("loop", setup) }
|
|
|
|
func setup(c *caddy.Controller) error {
|
|
l, err := parse(c)
|
|
if err != nil {
|
|
return plugin.Error("loop", err)
|
|
}
|
|
|
|
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
|
|
l.Next = next
|
|
return l
|
|
})
|
|
|
|
// Send query to ourselves and see if it end up with us again.
|
|
c.OnStartup(func() error {
|
|
// Another Go function, otherwise we block startup and can't send the packet.
|
|
go func() {
|
|
deadline := time.Now().Add(30 * time.Second)
|
|
conf := dnsserver.GetConfig(c)
|
|
lh := ""
|
|
if len(conf.ListenHosts) > 0 {
|
|
lh = conf.ListenHosts[0]
|
|
}
|
|
addr := net.JoinHostPort(lh, conf.Port)
|
|
|
|
for time.Now().Before(deadline) {
|
|
l.setAddress(addr)
|
|
if _, err := l.exchange(addr); err != nil {
|
|
l.reset()
|
|
time.Sleep(1 * time.Second)
|
|
continue
|
|
}
|
|
|
|
go func() {
|
|
time.Sleep(2 * time.Second)
|
|
l.setDisabled()
|
|
}()
|
|
|
|
break
|
|
}
|
|
l.setDisabled()
|
|
}()
|
|
return nil
|
|
})
|
|
|
|
return nil
|
|
}
|
|
|
|
func parse(c *caddy.Controller) (*Loop, error) {
|
|
i := 0
|
|
zones := []string{"."}
|
|
for c.Next() {
|
|
if i > 0 {
|
|
return nil, plugin.ErrOnce
|
|
}
|
|
i++
|
|
if c.NextArg() {
|
|
return nil, c.ArgErr()
|
|
}
|
|
|
|
if len(c.ServerBlockKeys) > 0 {
|
|
z := plugin.Host(c.ServerBlockKeys[0]).NormalizeExact()
|
|
if len(z) > 0 {
|
|
zones = z
|
|
}
|
|
}
|
|
}
|
|
return New(zones[0]), nil
|
|
}
|
|
|
|
// qname returns a random name. <rand.Int()>.<rand.Int().<zone>.
|
|
func qname(zone string) string {
|
|
l1 := strconv.Itoa(r.Int())
|
|
l2 := strconv.Itoa(r.Int())
|
|
|
|
return dnsutil.Join(l1, l2, zone)
|
|
}
|
|
|
|
var r = rand.New(time.Now().UnixNano())
|