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Code Issues Releases Activity

PTR should handle "Classless in-addr.arpa delegation" RFC2317 (#149)

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* Handle IPv4 "Classless in-addr.arpa delegation" RFC2317 (partial).
* Validate PTR name when in RFC2317 "Classless in-addr.arpa delegation" domains.
* Update docs
* Set CanUsePTR for Route53 and Google CloudDNS.
* BIND: Replace "/" with "_" in filenames.
This commit is contained in:
Tom Limoncelli
2017-07-10 19:24:55 -04:00
committed by GitHub
parent 9e66402e0b
commit e563c53658
9 changed files with 203 additions and 25 deletions
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17
pkg/transform/arpa.go
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@@ -4,6 +4,8 @@ import (
"fmt"
"net"
"strings"
"github.com/pkg/errors"
)
func ReverseDomainName(cidr string) (string, error) {
@@ -16,11 +18,26 @@ func ReverseDomainName(cidr string) (string, error) {
return "", err
}
base = strings.TrimRight(base, ".")
if !a.Equal(c.IP) {
return "", errors.Errorf("CIDR %v has 1 bits beyond the mask", cidr)
}
bits, total := c.Mask.Size()
var toTrim int
if bits == 0 {
return "", fmt.Errorf("Cannot use /0 in reverse cidr")
}
// Handle IPv4 "Classless in-addr.arpa delegation" RFC2317:
if total == 32 && bits >= 25 && bits < 32 {
// first address / netmask . Class-b-arpa.
fparts := strings.Split(c.IP.String(), ".")
first := fparts[3]
bparts := strings.SplitN(base, ".", 2)
return fmt.Sprintf("%s/%d.%s", first, bits, bparts[1]), nil
}
// Handle IPv4 Class-full and IPv6:
if total == 32 {
if bits%8 != 0 {
return "", fmt.Errorf("IPv4 mask must be multiple of 8 bits")