Raise copyright years

[govpn.git] / common.go

diff --git a/common.go b/common.go
index fbafd56ab680de6afc61eb50f41890e1ed1babfc..f9c5d1a44e04d8435b7f2c7a2335d4f29a74cf78 100644 (file)
--- a/common.go
+++ b/common.go
@@ -1,11 +1,10 @@
 /*
 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
@@ -27,35 +26,43 @@ import (
 
 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
        }
 }