mirror of
https://github.com/token2/snapd.git
synced 2026-03-13 11:15:47 -07:00
86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2015-2019 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package netutil
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import (
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"fmt"
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"net"
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"os"
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"runtime"
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unix "syscall"
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"github.com/coreos/go-systemd/activation"
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"github.com/snapcore/snapd/logger"
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)
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// GetListener tries to get a listener for the given socket path from
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// the listener map, and if it fails it tries to set it up directly.
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func GetListener(socketPath string, listenerMap map[string]net.Listener) (net.Listener, error) {
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if listener, ok := listenerMap[socketPath]; ok {
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return listener, nil
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}
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if c, err := net.Dial("unix", socketPath); err == nil {
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c.Close()
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return nil, fmt.Errorf("socket %q already in use", socketPath)
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}
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if err := os.Remove(socketPath); err != nil && !os.IsNotExist(err) {
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return nil, err
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}
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address, err := net.ResolveUnixAddr("unix", socketPath)
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if err != nil {
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return nil, err
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}
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runtime.LockOSThread()
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oldmask := unix.Umask(0111)
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listener, err := net.ListenUnix("unix", address)
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unix.Umask(oldmask)
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runtime.UnlockOSThread()
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if err != nil {
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return nil, err
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}
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logger.Debugf("socket %q was not activated; listening", socketPath)
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return listener, nil
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}
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// ActivationListeners builds a map of addresses to listeners that were passed
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// during systemd activation
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func ActivationListeners() (lns map[string]net.Listener, err error) {
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// pass false to keep LISTEN_* environment variables passed by systemd
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files := activation.Files(false)
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lns = make(map[string]net.Listener, len(files))
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for _, f := range files {
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ln, err := net.FileListener(f)
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if err != nil {
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return nil, err
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}
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addr := ln.Addr().String()
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lns[addr] = ln
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}
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return lns, nil
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}
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