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|
package hosts
import (
"log"
"os"
"path"
"strings"
"time"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/mholt/caddy"
)
func init() {
caddy.RegisterPlugin("hosts", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
h, err := hostsParse(c)
if err != nil {
return plugin.Error("hosts", err)
}
parseChan := make(chan bool)
c.OnStartup(func() error {
h.readHosts()
go func() {
ticker := time.NewTicker(5 * time.Second)
for {
select {
case <-parseChan:
return
case <-ticker.C:
h.readHosts()
}
}
}()
return nil
})
c.OnShutdown(func() error {
close(parseChan)
return nil
})
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
h.Next = next
return h
})
return nil
}
func hostsParse(c *caddy.Controller) (Hosts, error) {
var h = Hosts{
Hostsfile: &Hostsfile{
path: "/etc/hosts",
hmap: newHostsMap(),
},
}
config := dnsserver.GetConfig(c)
inline := []string{}
i := 0
for c.Next() {
if i > 0 {
return h, plugin.ErrOnce
}
i++
args := c.RemainingArgs()
if len(args) >= 1 {
h.path = args[0]
args = args[1:]
if !path.IsAbs(h.path) && config.Root != "" {
h.path = path.Join(config.Root, h.path)
}
s, err := os.Stat(h.path)
if err != nil {
if os.IsNotExist(err) {
log.Printf("[WARNING] File does not exist: %s", h.path)
} else {
return h, c.Errf("unable to access hosts file '%s': %v", h.path, err)
}
}
if s != nil && s.IsDir() {
log.Printf("[WARNING] hosts file %q is a directory", h.path)
}
}
origins := make([]string, len(c.ServerBlockKeys))
copy(origins, c.ServerBlockKeys)
if len(args) > 0 {
origins = args
}
for i := range origins {
origins[i] = plugin.Host(origins[i]).Normalize()
}
h.Origins = origins
for c.NextBlock() {
switch c.Val() {
case "fallthrough":
h.Fall.SetZonesFromArgs(c.RemainingArgs())
default:
if len(h.Fall.Zones) == 0 {
line := strings.Join(append([]string{c.Val()}, c.RemainingArgs()...), " ")
inline = append(inline, line)
continue
}
return h, c.Errf("unknown property '%s'", c.Val())
}
}
}
h.initInline(inline)
return h, nil
}
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