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Diffstat (limited to 'pkg/pid/pid.go')
-rw-r--r--pkg/pid/pid.go114
1 files changed, 114 insertions, 0 deletions
diff --git a/pkg/pid/pid.go b/pkg/pid/pid.go
new file mode 100644
index 0000000..1124210
--- /dev/null
+++ b/pkg/pid/pid.go
@@ -0,0 +1,114 @@
+// Copyright (C) 2018-2020 LEAP
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// 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 pid
+
+import (
+ "fmt"
+ "io/ioutil"
+ "log"
+ "os"
+ "path/filepath"
+ "strconv"
+ "strings"
+ "syscall"
+
+ "0xacab.org/leap/bitmask-vpn/pkg/config"
+ "github.com/keybase/go-ps"
+)
+
+var pidFile = filepath.Join(config.Path, "systray.pid")
+
+func AcquirePID() error {
+ pid := syscall.Getpid()
+ current, err := getPID()
+ if err != nil {
+ return err
+ }
+
+ if current != pid && pidRunning(current) {
+ return fmt.Errorf("Another systray is running with pid: %d", current)
+ }
+
+ return setPID(pid)
+}
+
+func ReleasePID() error {
+ pid := syscall.Getpid()
+ current, err := getPID()
+ if err != nil {
+ return err
+ }
+ if current != 0 && current != pid {
+ return fmt.Errorf("Can't release pid file, is not own by this process")
+ }
+
+ if current == pid {
+ return os.Remove(pidFile)
+ }
+ return nil
+}
+
+func getPID() (int, error) {
+ _, err := os.Stat(pidFile)
+ if os.IsNotExist(err) {
+ return 0, nil
+ }
+ if err != nil {
+ return 0, err
+ }
+
+ file, err := os.Open(pidFile)
+ if err != nil {
+ return 0, err
+ }
+ defer file.Close()
+
+ b, err := ioutil.ReadAll(file)
+ if err != nil {
+ return 0, err
+ }
+ if len(b) == 0 {
+ return 0, nil
+ }
+ return strconv.Atoi(string(b))
+}
+
+func setPID(pid int) error {
+ file, err := os.Create(pidFile)
+ if err != nil {
+ return err
+ }
+ defer file.Close()
+
+ _, err = file.WriteString(fmt.Sprintf("%d", pid))
+ return err
+}
+
+func pidRunning(pid int) bool {
+ if pid == 0 {
+ return false
+ }
+ proc, err := ps.FindProcess(pid)
+ if err != nil {
+ log.Printf("An error ocurred finding process: %v", err)
+ return false
+ }
+ if proc == nil {
+ return false
+ }
+ log.Printf("There is a running process with the pid %d and executable: %s", pid, proc.Executable())
+ return strings.Contains(os.Args[0], proc.Executable())
+}