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package system
import (
"errors"
"fmt"
"os"
"hakurei.app/system/acl"
"hakurei.app/system/wayland"
)
// Wayland appends [WaylandOp] to [I].
func (sys *I) Wayland(syncFd **os.File, dst, src, appID, instanceID string) *I {
sys.ops = append(sys.ops, &WaylandOp{syncFd, dst, src, appID, instanceID, wayland.Conn{}})
return sys
}
// WaylandOp maintains a wayland socket with security-context-v1 attached via [wayland].
// The socket stops accepting connections once the pipe referred to by sync is closed.
// The socket is pathname only and is destroyed on revert.
type WaylandOp struct {
sync **os.File
dst, src string
appID, instanceID string
conn wayland.Conn
}
func (w *WaylandOp) Type() Enablement { return Process }
func (w *WaylandOp) apply(sys *I) error {
if w.sync == nil {
// this is a misuse of the API; do not return a wrapped error
return errors.New("invalid sync")
}
// the Wayland op is not repeatable
if *w.sync != nil {
// this is a misuse of the API; do not return a wrapped error
return errors.New("attempted to attach multiple wayland sockets")
}
if err := w.conn.Attach(w.src); err != nil {
return newOpError("wayland", err, false)
} else {
msg.Verbosef("wayland attached on %q", w.src)
}
if sp, err := w.conn.Bind(w.dst, w.appID, w.instanceID); err != nil {
return newOpError("wayland", err, false)
} else {
*w.sync = sp
msg.Verbosef("wayland listening on %q", w.dst)
if err = os.Chmod(w.dst, 0); err != nil {
return newOpError("wayland", err, false)
}
return newOpError("wayland", acl.Update(w.dst, sys.uid, acl.Read, acl.Write, acl.Execute), false)
}
}
func (w *WaylandOp) revert(_ *I, ec *Criteria) error {
if ec.hasType(w) {
msg.Verbosef("removing wayland socket on %q", w.dst)
if err := os.Remove(w.dst); err != nil && !errors.Is(err, os.ErrNotExist) {
return newOpError("wayland", err, true)
}
msg.Verbosef("detaching from wayland on %q", w.src)
return newOpError("wayland", w.conn.Close(), true)
} else {
msg.Verbosef("skipping wayland cleanup on %q", w.dst)
return nil
}
}
func (w *WaylandOp) Is(o Op) bool {
target, ok := o.(*WaylandOp)
return ok && w != nil && target != nil &&
w.dst == target.dst && w.src == target.src &&
w.appID == target.appID && w.instanceID == target.instanceID
}
func (w *WaylandOp) Path() string { return w.dst }
func (w *WaylandOp) String() string { return fmt.Sprintf("wayland socket at %q", w.dst) }
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