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setup.go
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setup.go
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package stopdnsrebind
import (
"github.com/coredns/caddy"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/miekg/dns"
)
func init() { plugin.Register("stopdnsrebind", setup) }
func setup(c *caddy.Controller) error {
allowList, err := parse(c)
//parsing err
if err != nil {
return err
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
return Stopdnsrebind{Next: next, AllowList: allowList}
})
return nil
}
func parse(c *caddy.Controller) ([]string, error) {
allowList := []string{}
for c.Next() {
for c.NextBlock() {
if c.Val() != "allow" {
return nil, plugin.Error("stopdnsrebind", c.Err("only allow operation is supported"))
}
for _, d := range c.RemainingArgs() {
_, valid := dns.IsDomainName(d)
if !valid {
return nil, plugin.Error("stopdnsrebind", c.Errf("%s is not a valid domain", d))
}
allowList = append(allowList, d)
}
}
}
return allowList, nil
}