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setup.go
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setup.go
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package file
import (
"fmt"
"os"
"path"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/middleware"
"github.com/coredns/coredns/middleware/pkg/dnsutil"
"github.com/coredns/coredns/middleware/proxy"
"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 middleware.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
})
}
dnsserver.GetConfig(c).AddMiddleware(func(next middleware.Handler) middleware.Handler {
return File{Next: next, Zones: zones}
})
return nil
}
func fileParse(c *caddy.Controller) (Zones, error) {
z := make(map[string]*Zone)
names := []string{}
origins := []string{}
config := dnsserver.GetConfig(c)
for c.Next() {
if c.Val() == "file" {
// 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 !path.IsAbs(fileName) && config.Root != "" {
fileName = path.Join(config.Root, fileName)
}
reader, err := os.Open(fileName)
if err != nil {
// bail out
return Zones{}, err
}
for i := range origins {
origins[i] = middleware.Host(origins[i]).Normalize()
zone, err := Parse(reader, origins[i], fileName)
if err == nil {
z[origins[i]] = zone
} else {
return Zones{}, err
}
names = append(names, origins[i])
}
noReload := false
prxy := proxy.Proxy{}
for c.NextBlock() {
t, _, e := TransferParse(c, false)
if e != nil {
return Zones{}, e
}
switch c.Val() {
case "no_reload":
noReload = true
case "upstream":
args := c.RemainingArgs()
if len(args) == 0 {
return Zones{}, c.ArgErr()
}
ups, err := dnsutil.ParseHostPortOrFile(args...)
if err != nil {
return Zones{}, err
}
prxy = proxy.NewLookup(ups)
}
for _, origin := range origins {
if t != nil {
z[origin].TransferTo = append(z[origin].TransferTo, t...)
}
z[origin].NoReload = noReload
z[origin].Proxy = prxy
}
}
}
}
return Zones{Z: z, Names: names}, nil
}
// TransferParse parses transfer statements: 'transfer to [address...]'.
func TransferParse(c *caddy.Controller, secondary bool) (tos, froms []string, err error) {
what := c.Val()
if !c.NextArg() {
return nil, nil, c.ArgErr()
}
value := c.Val()
switch what {
case "transfer":
if value == "to" {
tos = c.RemainingArgs()
for i := range tos {
if tos[i] != "*" {
normalized, err := dnsutil.ParseHostPort(tos[i], "53")
if err != nil {
return nil, nil, err
}
tos[i] = normalized
}
}
}
if value == "from" {
if !secondary {
return nil, nil, fmt.Errorf("can't use `transfer from` when not being a secondary")
}
froms = c.RemainingArgs()
for i := range froms {
if froms[i] != "*" {
normalized, err := dnsutil.ParseHostPort(froms[i], "53")
if err != nil {
return nil, nil, err
}
froms[i] = normalized
} else {
return nil, nil, fmt.Errorf("can't use '*' in transfer from")
}
}
}
}
return
}