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address.go
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/
address.go
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package dnsserver
import (
"fmt"
"net"
"strings"
"github.com/miekg/dns"
)
type zoneAddr struct {
Zone string
Port string
}
// String return z.Zone + ":" + z.Port as a string.
func (z zoneAddr) String() string { return z.Zone + ":" + z.Port }
// normalizeZone parses an zone string into a structured format with separate
// host, and port portions, as well as the original input string.
func normalizeZone(str string) (zoneAddr, error) {
var err error
// separate host and port
host, port, err := net.SplitHostPort(str)
if err != nil {
host, port, err = net.SplitHostPort(str + ":")
// no error check here; return err at end of function
}
if len(host) > 255 {
return zoneAddr{}, fmt.Errorf("specified zone is too long: %d > 255", len(host))
}
_, d := dns.IsDomainName(host)
if !d {
return zoneAddr{}, fmt.Errorf("zone is not a valid domain name: %s", host)
}
if port == "" {
port = "53"
}
return zoneAddr{Zone: strings.ToLower(dns.Fqdn(host)), Port: port}, err
}