tunnel: enable {Pre,Post}{Up,Down} scripts gated behind admin knob

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

4 files changed, 26 insertions, 1 deletions

diff --git a/conf/config.go b/conf/config.go
index 1ce1988d..9eb6157e 100644
--- a/conf/config.go
+++ b/conf/config.go
@@ -49,6 +49,10 @@ type Interface struct {
 	MTU        uint16
 	DNS        []net.IP
 	DNSSearch  []string
+	PreUp      string
+	PostUp     string
+	PreDown    string
+	PostDown   string
 }
 
 type Peer struct {
diff --git a/conf/filewriter_windows.go b/conf/filewriter_windows.go
index 9fb1f566..8860ba31 100644
--- a/conf/filewriter_windows.go
+++ b/conf/filewriter_windows.go
@@ -69,4 +69,4 @@ func writeEncryptedFile(destination string, contents []byte) error {
 		return err
 	}
 	return nil
-}
\ No newline at end of file
+}
diff --git a/conf/parser.go b/conf/parser.go
index da21e796..17b0e21f 100644
--- a/conf/parser.go
+++ b/conf/parser.go
@@ -282,6 +282,14 @@ func FromWgQuick(s string, name string) (*Config, error) {
 						conf.Interface.DNS = append(conf.Interface.DNS, a)
 					}
 				}
+			case "preup":
+				conf.Interface.PreUp = val
+			case "postup":
+				conf.Interface.PostUp = val
+			case "predown":
+				conf.Interface.PreDown = val
+			case "postdown":
+				conf.Interface.PostDown = val
 			default:
 				return nil, &ParseError{l18n.Sprintf("Invalid key for [Interface] section"), key}
 			}
diff --git a/conf/writer.go b/conf/writer.go
index 365e65e9..6b16f843 100644
--- a/conf/writer.go
+++ b/conf/writer.go
@@ -41,6 +41,19 @@ func (conf *Config) ToWgQuick() string {
 		output.WriteString(fmt.Sprintf("MTU = %d\n", conf.Interface.MTU))
 	}
 
+	if len(conf.Interface.PreUp) > 0 {
+		output.WriteString(fmt.Sprintf("PreUp = %s\n", conf.Interface.PreUp))
+	}
+	if len(conf.Interface.PostUp) > 0 {
+		output.WriteString(fmt.Sprintf("PostUp = %s\n", conf.Interface.PostUp))
+	}
+	if len(conf.Interface.PreDown) > 0 {
+		output.WriteString(fmt.Sprintf("PreDown = %s\n", conf.Interface.PreDown))
+	}
+	if len(conf.Interface.PostDown) > 0 {
+		output.WriteString(fmt.Sprintf("PostDown = %s\n", conf.Interface.PostDown))
+	}
+
 	for _, peer := range conf.Peers {
 		output.WriteString("\n[Peer]\n")