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package transfer
import (
"github.com/coredns/caddy"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/parse"
"github.com/coredns/coredns/plugin/pkg/transport"
)
func init() {
caddy.RegisterPlugin("transfer", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
t, err := parseTransfer(c)
if err != nil {
return plugin.Error("transfer", err)
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
t.Next = next
return t
})
c.OnStartup(func() error {
// find all plugins that implement Transferer and add them to Transferers
plugins := dnsserver.GetConfig(c).Handlers()
for _, pl := range plugins {
tr, ok := pl.(Transferer)
if !ok {
continue
}
t.Transferers = append(t.Transferers, tr)
}
return nil
})
return nil
}
func parseTransfer(c *caddy.Controller) (*Transfer, error) {
t := &Transfer{}
for c.Next() {
x := &xfr{}
x.Zones = plugin.OriginsFromArgsOrServerBlock(c.RemainingArgs(), c.ServerBlockKeys)
for c.NextBlock() {
switch c.Val() {
case "to":
args := c.RemainingArgs()
if len(args) == 0 {
return nil, c.ArgErr()
}
for _, host := range args {
if host == "*" {
x.to = append(x.to, host)
continue
}
normalized, err := parse.HostPort(host, transport.Port)
if err != nil {
return nil, err
}
x.to = append(x.to, normalized)
}
default:
return nil, plugin.Error("transfer", c.Errf("unknown property %q", c.Val()))
}
}
if len(x.to) == 0 {
return nil, plugin.Error("transfer", c.Err("'to' is required"))
}
t.xfrs = append(t.xfrs, x)
}
return t, nil
}
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