88 lines
2.3 KiB
Go
88 lines
2.3 KiB
Go
|
package dns
|
||
|
|
|
||
|
|
import (
|
||
|
|
"net"
|
||
|
|
"reflect"
|
||
|
|
"strconv"
|
||
|
|
)
|
||
|
|
|
||
|
|
// NumField returns the number of rdata fields r has.
|
||
|
|
func NumField(r RR) int {
|
||
|
|
return reflect.ValueOf(r).Elem().NumField() - 1 // Remove RR_Header
|
||
|
|
}
|
||
|
|
|
||
|
|
// Field returns the rdata field i as a string. Fields are indexed starting from 1.
|
||
|
|
// RR types that holds slice data, for instance the NSEC type bitmap will return a single
|
||
|
|
// string where the types are concatenated using a space.
|
||
|
|
// Accessing non existing fields will cause a panic.
|
||
|
|
func Field(r RR, i int) string {
|
||
|
|
if i == 0 {
|
||
|
|
return ""
|
||
|
|
}
|
||
|
|
d := reflect.ValueOf(r).Elem().Field(i)
|
||
|
|
switch k := d.Kind(); k {
|
||
|
|
case reflect.String:
|
||
|
|
return d.String()
|
||
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
||
|
|
return strconv.FormatInt(d.Int(), 10)
|
||
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
||
|
|
return strconv.FormatUint(d.Uint(), 10)
|
||
|
|
case reflect.Slice:
|
||
|
|
switch reflect.ValueOf(r).Elem().Type().Field(i).Tag {
|
||
|
|
case `dns:"a"`:
|
||
|
|
// TODO(miek): Hmm store this as 16 bytes
|
||
|
|
if d.Len() < net.IPv6len {
|
||
|
|
return net.IPv4(byte(d.Index(0).Uint()),
|
||
|
|
byte(d.Index(1).Uint()),
|
||
|
|
byte(d.Index(2).Uint()),
|
||
|
|
byte(d.Index(3).Uint())).String()
|
||
|
|
}
|
||
|
|
return net.IPv4(byte(d.Index(12).Uint()),
|
||
|
|
byte(d.Index(13).Uint()),
|
||
|
|
byte(d.Index(14).Uint()),
|
||
|
|
byte(d.Index(15).Uint())).String()
|
||
|
|
case `dns:"aaaa"`:
|
||
|
|
return net.IP{
|
||
|
|
byte(d.Index(0).Uint()),
|
||
|
|
byte(d.Index(1).Uint()),
|
||
|
|
byte(d.Index(2).Uint()),
|
||
|
|
byte(d.Index(3).Uint()),
|
||
|
|
byte(d.Index(4).Uint()),
|
||
|
|
byte(d.Index(5).Uint()),
|
||
|
|
byte(d.Index(6).Uint()),
|
||
|
|
byte(d.Index(7).Uint()),
|
||
|
|
byte(d.Index(8).Uint()),
|
||
|
|
byte(d.Index(9).Uint()),
|
||
|
|
byte(d.Index(10).Uint()),
|
||
|
|
byte(d.Index(11).Uint()),
|
||
|
|
byte(d.Index(12).Uint()),
|
||
|
|
byte(d.Index(13).Uint()),
|
||
|
|
byte(d.Index(14).Uint()),
|
||
|
|
byte(d.Index(15).Uint()),
|
||
|
|
}.String()
|
||
|
|
case `dns:"nsec"`:
|
||
|
|
if d.Len() == 0 {
|
||
|
|
return ""
|
||
|
|
}
|
||
|
|
s := Type(d.Index(0).Uint()).String()
|
||
|
|
for i := 1; i < d.Len(); i++ {
|
||
|
|
s += " " + Type(d.Index(i).Uint()).String()
|
||
|
|
}
|
||
|
|
return s
|
||
|
|
default:
|
||
|
|
// if it does not have a tag its a string slice
|
||
|
|
fallthrough
|
||
|
|
case `dns:"txt"`:
|
||
|
|
if d.Len() == 0 {
|
||
|
|
return ""
|
||
|
|
}
|
||
|
|
s := d.Index(0).String()
|
||
|
|
for i := 1; i < d.Len(); i++ {
|
||
|
|
s += " " + d.Index(i).String()
|
||
|
|
}
|
||
|
|
return s
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return ""
|
||
|
|
}
|