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|
package setup
import (
"fmt"
"net"
"os"
"github.com/miekg/coredns/middleware"
"github.com/miekg/coredns/middleware/file"
)
// File sets up the file middleware.
func File(c *Controller) (middleware.Middleware, error) {
zones, err := fileParse(c)
if err != nil {
return nil, err
}
// Add startup functions to notify the master(s).
for _, n := range zones.Names {
c.Startup = append(c.Startup, func() error {
zones.Z[n].StartupOnce.Do(func() {
if len(zones.Z[n].TransferTo) > 0 {
zones.Z[n].Notify()
}
zones.Z[n].Reload(nil)
})
return nil
})
}
return func(next middleware.Handler) middleware.Handler {
return file.File{Next: next, Zones: zones}
}, nil
}
func fileParse(c *Controller) (file.Zones, error) {
z := make(map[string]*file.Zone)
names := []string{}
for c.Next() {
if c.Val() == "file" {
// file db.file [zones...]
if !c.NextArg() {
return file.Zones{}, c.ArgErr()
}
fileName := c.Val()
origins := c.ServerBlockHosts
args := c.RemainingArgs()
if len(args) > 0 {
origins = args
}
reader, err := os.Open(fileName)
if err != nil {
// bail out
return file.Zones{}, err
}
for i, _ := range origins {
origins[i] = middleware.Host(origins[i]).Normalize()
zone, err := file.Parse(reader, origins[i], fileName)
if err == nil {
z[origins[i]] = zone
} else {
return file.Zones{}, err
}
names = append(names, origins[i])
}
noReload := false
for c.NextBlock() {
t, _, e := transferParse(c)
if e != nil {
return file.Zones{}, e
}
switch c.Val() {
case "no_reload":
noReload = true
}
// discard from, here, maybe check and show log when we do?
for _, origin := range origins {
if t != nil {
z[origin].TransferTo = append(z[origin].TransferTo, t...)
}
z[origin].NoReload = noReload
}
}
}
}
return file.Zones{Z: z, Names: names}, nil
}
// transferParse parses transfer statements: 'transfer to [address...]'.
func transferParse(c *Controller) (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] != "*" {
if x := net.ParseIP(tos[i]); x == nil {
return nil, nil, fmt.Errorf("must specify an IP addres: `%s'", tos[i])
}
tos[i] = middleware.Addr(tos[i]).Normalize()
}
}
}
if value == "from" {
froms = c.RemainingArgs()
for i, _ := range froms {
if froms[i] != "*" {
if x := net.ParseIP(froms[i]); x == nil {
return nil, nil, fmt.Errorf("must specify an IP addres: `%s'", froms[i])
}
froms[i] = middleware.Addr(froms[i]).Normalize()
} else {
return nil, nil, fmt.Errorf("can't use '*' in transfer from")
}
}
}
}
return
}
|
