132 lines
2.3 KiB
Go
132 lines
2.3 KiB
Go
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package main
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// Adapted from https://github.com/maxymania/go-system/blob/master/posix_acl/posix_acl.go
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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)
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const (
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aclUserOwner = 0x0001
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aclUser = 0x0002
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aclGroupOwner = 0x0004
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aclGroup = 0x0008
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aclMask = 0x0010
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aclOthers = 0x0020
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)
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type aclSID uint64
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type aclElem struct {
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Tag uint16
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Perm uint16
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ID uint32
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}
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type acl struct {
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Version uint32
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List []aclElement
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}
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type aclElement struct {
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aclSID
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Perm uint16
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}
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func (a *aclSID) setUID(uid uint32) {
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*a = aclSID(uid) | (aclUser << 32)
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}
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func (a *aclSID) setGID(gid uint32) {
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*a = aclSID(gid) | (aclGroup << 32)
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}
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func (a *aclSID) setType(tp int) {
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*a = aclSID(tp) << 32
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}
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func (a aclSID) getType() int {
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return int(a >> 32)
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}
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func (a aclSID) getID() uint32 {
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return uint32(a & 0xffffffff)
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}
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func (a aclSID) String() string {
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switch a >> 32 {
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case aclUserOwner:
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return "user::"
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case aclUser:
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return fmt.Sprintf("user:%v:", a.getID())
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case aclGroupOwner:
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return "group::"
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case aclGroup:
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return fmt.Sprintf("group:%v:", a.getID())
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case aclMask:
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return "mask::"
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case aclOthers:
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return "other::"
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}
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return "?:"
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}
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func (a aclElement) String() string {
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str := ""
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if (a.Perm & 4) != 0 {
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str += "r"
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} else {
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str += "-"
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}
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if (a.Perm & 2) != 0 {
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str += "w"
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} else {
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str += "-"
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}
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if (a.Perm & 1) != 0 {
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str += "x"
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} else {
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str += "-"
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}
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return fmt.Sprintf("%v%v", a.aclSID, str)
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}
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func (a *acl) decode(xattr []byte) {
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var elem aclElement
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ae := new(aclElem)
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nr := bytes.NewReader(xattr)
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e := binary.Read(nr, binary.LittleEndian, &a.Version)
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if e != nil {
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a.Version = 0
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return
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}
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if len(a.List) > 0 {
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a.List = a.List[:0]
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}
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for binary.Read(nr, binary.LittleEndian, ae) == nil {
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elem.aclSID = (aclSID(ae.Tag) << 32) | aclSID(ae.ID)
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elem.Perm = ae.Perm
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a.List = append(a.List, elem)
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}
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}
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func (a *acl) encode() []byte {
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buf := new(bytes.Buffer)
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ae := new(aclElem)
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binary.Write(buf, binary.LittleEndian, &a.Version)
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for _, elem := range a.List {
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ae.Tag = uint16(elem.getType())
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ae.Perm = elem.Perm
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ae.ID = elem.getID()
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binary.Write(buf, binary.LittleEndian, ae)
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}
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return buf.Bytes()
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}
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func (a *acl) String() string {
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var finalacl string
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for _, acl := range a.List {
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finalacl += acl.String() + "\n"
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}
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return finalacl
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}
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