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package bufsize
import (
"strconv"
"github.com/coredns/caddy"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
)
func init() { plugin.Register("bufsize", setup) }
func setup(c *caddy.Controller) error {
bufsize, err := parse(c)
if err != nil {
return plugin.Error("bufsize", err)
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
return Bufsize{Next: next, Size: bufsize}
})
return nil
}
func parse(c *caddy.Controller) (int, error) {
const defaultBufSize = 512
for c.Next() {
args := c.RemainingArgs()
switch len(args) {
case 0:
// Nothing specified; use 512 as default
return defaultBufSize, nil
case 1:
// Specified value is needed to verify
bufsize, err := strconv.Atoi(args[0])
if err != nil {
return -1, plugin.Error("bufsize", c.ArgErr())
}
// Follows RFC 6891
if bufsize < 512 || bufsize > 4096 {
return -1, plugin.Error("bufsize", c.ArgErr())
}
return bufsize, nil
default:
// Only 1 argument is acceptable
return -1, plugin.Error("bufsize", c.ArgErr())
}
}
return -1, plugin.Error("bufsize", c.ArgErr())
}
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