2 GoVPN -- simple secure free software virtual private network daemon
3 Copyright (C) 2014-2017 Sergey Matveev <stargrave@stargrave.org>
4 2016-2017 Bruno Clermont <bruno@robotinfra.com>
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
26 "github.com/pkg/errors"
29 // PeerContext holds info about a peer that connect or disconnect
30 // used for Up, PreUp and Down
31 type PeerContext struct {
37 // TunnelAction is an action for either client or server that is
38 // executed when tunnel goes down
39 type TunnelAction func(PeerContext) error
41 // TunnelPreUpAction is an action for client or server that is executed
42 // after user is authenticated
43 type TunnelPreUpAction func(PeerContext) (*TAP, error)
45 // RunScriptAction converts the path to a script into a TunnelAction
46 func RunScriptAction(path *string) TunnelAction {
50 return func(ctx PeerContext) error {
51 _, err := ScriptCall(*path, ctx.Config.Iface, ctx.RemoteAddress)
52 return errors.Wrapf(err, "ScriptCall path=%q interface=%q remote=%q", *path, ctx.Config.Iface, ctx.RemoteAddress)
56 // ScriptCall calls external program/script.
57 // You have to specify path to it and (inteface name as a rule) something
58 // that will be the first argument when calling it. Function will return
59 // it's output and possible error.
60 func ScriptCall(path, ifaceName, remoteAddr string) ([]byte, error) {
64 if _, err := os.Stat(path); err != nil && os.IsNotExist(err) {
65 return nil, errors.Wrap(err, "os.Path")
67 cmd := exec.Command(path)
68 cmd.Env = append(cmd.Env, environmentKeyInterface+"="+ifaceName)
69 cmd.Env = append(cmd.Env, environmentKeyRemote+"="+remoteAddr)
70 out, err := cmd.CombinedOutput()
71 return out, errors.Wrap(err, "cmd.CombinedOutput")