/*
GoVPN -- simple secure free software virtual private network daemon
-Copyright (C) 2014-2015 Sergey Matveev <stargrave@stargrave.org>
+Copyright (C) 2014-2020 Sergey Matveev <stargrave@stargrave.org>
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.
+the Free Software Foundation, version 3 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
const (
TimeoutDefault = 60
+ EtherSize = 14
+ MTUMax = 9000 + EtherSize + 1
+ MTUDefault = 1500 + EtherSize + 1
+
+ ENV_IFACE = "GOVPN_IFACE"
+ ENV_REMOTE = "GOVPN_REMOTE"
)
var (
- MTU int
- Version string
+ Version string = "UNKNOWN"
)
// Call external program/script.
// You have to specify path to it and (inteface name as a rule) something
// that will be the first argument when calling it. Function will return
// it's output and possible error.
-func ScriptCall(path, ifaceName string) ([]byte, error) {
+func ScriptCall(path, ifaceName, remoteAddr string) ([]byte, error) {
if path == "" {
return nil, nil
}
if _, err := os.Stat(path); err != nil && os.IsNotExist(err) {
return nil, err
}
- out, err := exec.Command(path, ifaceName).CombinedOutput()
+ cmd := exec.Command(path)
+ cmd.Env = append(cmd.Env, ENV_IFACE+"="+ifaceName)
+ cmd.Env = append(cmd.Env, ENV_REMOTE+"="+remoteAddr)
+ out, err := cmd.CombinedOutput()
if err != nil {
log.Println("Script error", path, err, string(out))
}
return out, err
}
-// Zero each byte
-func sliceZero(data []byte) {
+// Zero each byte.
+func SliceZero(data []byte) {
for i := 0; i < len(data); i++ {
- data[i] = '\x00'
+ data[i] = 0
}
}