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package file
import (
"os"
"path/filepath"
"time"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/parse"
"github.com/coredns/coredns/plugin/pkg/upstream"
"github.com/mholt/caddy"
)
func init() {
caddy.RegisterPlugin("file", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
zones, err := fileParse(c)
if err != nil {
return plugin.Error("file", err)
}
// Add startup functions to notify the master(s).
for _, n := range zones.Names {
z := zones.Z[n]
c.OnStartup(func() error {
z.StartupOnce.Do(func() {
if len(z.TransferTo) > 0 {
z.Notify()
}
z.Reload()
})
return nil
})
}
for _, n := range zones.Names {
z := zones.Z[n]
c.OnShutdown(z.OnShutdown)
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
return File{Next: next, Zones: zones}
})
return nil
}
func fileParse(c *caddy.Controller) (Zones, error) {
z := make(map[string]*Zone)
names := []string{}
config := dnsserver.GetConfig(c)
for c.Next() {
// file db.file [zones...]
if !c.NextArg() {
return Zones{}, c.ArgErr()
}
fileName := c.Val()
origins := make([]string, len(c.ServerBlockKeys))
copy(origins, c.ServerBlockKeys)
args := c.RemainingArgs()
if len(args) > 0 {
origins = args
}
if !filepath.IsAbs(fileName) && config.Root != "" {
fileName = filepath.Join(config.Root, fileName)
}
reader, err := os.Open(fileName)
if err != nil {
// bail out
return Zones{}, err
}
for i := range origins {
origins[i] = plugin.Host(origins[i]).Normalize()
zone, err := Parse(reader, origins[i], fileName, 0)
if err == nil {
z[origins[i]] = zone
} else {
return Zones{}, err
}
names = append(names, origins[i])
}
reload := 1 * time.Minute
upstr := upstream.New()
t := []string{}
var e error
for c.NextBlock() {
switch c.Val() {
case "transfer":
t, _, e = parse.Transfer(c, false)
if e != nil {
return Zones{}, e
}
case "reload":
d, err := time.ParseDuration(c.RemainingArgs()[0])
if err != nil {
return Zones{}, plugin.Error("file", err)
}
reload = d
case "no_reload":
log.Warning("NO_RELOAD of directory is deprecated. Use RELOAD (set to 0) instead. See https://coredns.io/plugins/file/#syntax")
reload = 0
case "upstream":
// ignore args, will be error later.
c.RemainingArgs() // clear buffer
default:
return Zones{}, c.Errf("unknown property '%s'", c.Val())
}
for _, origin := range origins {
if t != nil {
z[origin].TransferTo = append(z[origin].TransferTo, t...)
}
z[origin].ReloadInterval = reload
z[origin].Upstream = upstr
}
}
}
return Zones{Z: z, Names: names}, nil
}
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