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