1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package userd
import (
"fmt"
"github.com/godbus/dbus/v5"
"github.com/snapcore/snapd/sandbox/cgroup"
)
var snapFromSender = snapFromSenderImpl
func snapFromSenderImpl(conn *dbus.Conn, sender dbus.Sender) (string, error) {
pid, err := connectionPid(conn, sender)
if err != nil {
return "", fmt.Errorf("cannot get connection pid: %v", err)
}
snap, err := cgroup.SnapNameFromPid(pid)
if err != nil {
return "", fmt.Errorf("cannot find snap for connection: %v", err)
}
// Check that the sender is still connected to the bus: if it
// has disconnected between the GetConnectionUnixProcessID
// call and when we poked around in /proc, then it is possible
// that the process ID was reused.
if !nameHasOwner(conn, sender) {
return "", fmt.Errorf("sender is no longer connected to the bus")
}
return snap, nil
}
func connectionPid(conn *dbus.Conn, sender dbus.Sender) (pid int, err error) {
call := conn.BusObject().Call("org.freedesktop.DBus.GetConnectionUnixProcessID", 0, sender)
if call.Err != nil {
return 0, call.Err
}
call.Store(&pid)
return pid, nil
}
func nameHasOwner(conn *dbus.Conn, sender dbus.Sender) bool {
call := conn.BusObject().Call("org.freedesktop.DBus.NameHasOwner", 0, sender)
if call.Err != nil {
return false
}
var hasOwner bool
call.Store(&hasOwner)
return hasOwner
}
|
