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package pac
import (
"encoding/binary"
"sort"
"gopkg.in/jcmturner/rpc.v0/ndr"
)
// UPNDNSInfo implements https://msdn.microsoft.com/en-us/library/dd240468.aspx
type UPNDNSInfo struct {
UPNLength uint16
UPNOffset uint16
DNSDomainNameLength uint16
DNSDomainNameOffset uint16
Flags uint32
UPN string
DNSDomain string
}
const (
upnNoUPNAttr = 31
)
// Unmarshal bytes into the UPN_DNSInfo struct
func (k *UPNDNSInfo) Unmarshal(b []byte) error {
//The UPN_DNS_INFO structure is a simple structure that is not NDR-encoded.
var p int
var e binary.ByteOrder = binary.LittleEndian
k.UPNLength = ndr.ReadUint16(&b, &p, &e)
k.UPNOffset = ndr.ReadUint16(&b, &p, &e)
k.DNSDomainNameLength = ndr.ReadUint16(&b, &p, &e)
k.DNSDomainNameOffset = ndr.ReadUint16(&b, &p, &e)
k.Flags = ndr.ReadUint32(&b, &p, &e)
ub := b[k.UPNOffset : k.UPNOffset+k.UPNLength]
db := b[k.DNSDomainNameOffset : k.DNSDomainNameOffset+k.DNSDomainNameLength]
u := make([]rune, k.UPNLength/2, k.UPNLength/2)
for i := 0; i < len(u); i++ {
q := i * 2
u[i] = rune(ndr.ReadUint16(&ub, &q, &e))
}
k.UPN = string(u)
d := make([]rune, k.DNSDomainNameLength/2, k.DNSDomainNameLength/2)
for i := 0; i < len(d); i++ {
q := i * 2
d[i] = rune(ndr.ReadUint16(&db, &q, &e))
}
k.DNSDomain = string(d)
l := []int{
p,
int(k.UPNOffset + k.UPNLength),
int(k.DNSDomainNameOffset + k.DNSDomainNameLength),
}
sort.Ints(l)
//Check that there is only zero padding left
for _, v := range b[l[2]:] {
if v != 0 {
return ndr.Malformed{EText: "non-zero padding left over at end of data stream."}
}
}
return nil
}
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