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