forked from LeakIX/go-smb2
/
dtyp.go
150 lines (124 loc) · 2.89 KB
/
dtyp.go
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// ref: MS-DTYP
package smb2
import (
"strconv"
"strings"
)
type Filetime struct {
LowDateTime uint32
HighDateTime uint32
}
func (ft *Filetime) Size() int {
return 8
}
func (ft *Filetime) Encode(p []byte) {
le.PutUint32(p[:4], ft.LowDateTime)
le.PutUint32(p[4:8], ft.HighDateTime)
}
func (ft *Filetime) Nanoseconds() int64 {
nsec := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime)
nsec -= 116444736000000000
nsec *= 100
return nsec
}
func NsecToFiletime(nsec int64) (ft *Filetime) {
nsec /= 100
nsec += 116444736000000000
return &Filetime{
LowDateTime: uint32(nsec & 0xffffffff),
HighDateTime: uint32(nsec >> 32 & 0xffffffff),
}
}
type FiletimeDecoder []byte
func (ft FiletimeDecoder) LowDateTime() uint32 {
return le.Uint32(ft[:4])
}
func (ft FiletimeDecoder) HighDateTime() uint32 {
return le.Uint32(ft[4:8])
}
func (ft FiletimeDecoder) Nanoseconds() int64 {
nsec := int64(ft.HighDateTime())<<32 + int64(ft.LowDateTime())
nsec -= 116444736000000000
nsec *= 100
return nsec
}
func (ft FiletimeDecoder) Decode() *Filetime {
return &Filetime{
LowDateTime: ft.LowDateTime(),
HighDateTime: ft.HighDateTime(),
}
}
type Sid struct {
Revision uint8
IdentifierAuthority uint64
SubAuthority []uint32
}
func (sid *Sid) String() string {
list := make([]string, 0, 3+len(sid.SubAuthority))
list = append(list, "S")
list = append(list, strconv.Itoa(int(sid.Revision)))
if sid.IdentifierAuthority < uint64(1<<32) {
list = append(list, strconv.FormatUint(sid.IdentifierAuthority, 10))
} else {
list = append(list, "0x"+strconv.FormatUint(sid.IdentifierAuthority, 16))
}
for _, a := range sid.SubAuthority {
list = append(list, strconv.FormatUint(uint64(a), 10))
}
return strings.Join(list, "-")
}
func (sid *Sid) Size() int {
return 8 + len(sid.SubAuthority)*4
}
func (sid *Sid) Encode(p []byte) {
p[0] = sid.Revision
p[1] = uint8(len(sid.SubAuthority))
for j := 0; j < 6; j++ {
p[2+j] = byte(sid.IdentifierAuthority >> uint64(8*(6-j)))
}
off := 8
for _, u := range sid.SubAuthority {
le.PutUint32(p[off:off+4], u)
off += 4
}
}
type SidDecoder []byte
func (c SidDecoder) IsInvalid() bool {
if len(c) < 8 {
return true
}
if len(c) < 8+int(c.SubAuthorityCount())*4 {
return true
}
return false
}
func (c SidDecoder) Revision() uint8 {
return c[0]
}
func (c SidDecoder) SubAuthorityCount() uint8 {
return c[1]
}
func (c SidDecoder) IdentifierAuthority() uint64 {
var u uint64
for j := 0; j < 6; j++ {
u += uint64(c[7-j]) << uint64(8*j)
}
return u
}
func (c SidDecoder) SubAuthority() []uint32 {
count := c.SubAuthorityCount()
as := make([]uint32, count)
off := 8
for i := uint8(0); i < count; i++ {
as[i] = le.Uint32(c[off : off+4])
off += 4
}
return as
}
func (c SidDecoder) Decode() *Sid {
return &Sid{
Revision: c.Revision(),
IdentifierAuthority: c.IdentifierAuthority(),
SubAuthority: c.SubAuthority(),
}
}