1 files changed, 163 insertions, 0 deletions
diff --git a/pkg/vpn/launcher.go b/pkg/vpn/launcher.go
new file mode 100644
index 0000000..e18fdc6
--- /dev/null
+++ b/pkg/vpn/launcher.go
@@ -0,0 +1,163 @@
+// +build !linux
+// Copyright (C) 2018 LEAP
+//
+// 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.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package vpn
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"0xacab.org/leap/bitmask-vpn/pkg/config"
+	"0xacab.org/leap/bitmask-vpn/pkg/vpn/bonafide"
+)
+
+type launcher struct {
+	helperAddr string
+}
+
+const initialHelperPort = 7171
+
+func probeHelperPort(port int) int {
+	// this should be enough for a local reply
+	timeout := time.Duration(500 * time.Millisecond)
+	c := http.Client{Timeout: timeout}
+	for {
+		if smellsLikeOurHelperSpirit(port, &c) {
+			return port
+		}
+		port++
+		if port > 65535 {
+			break
+		}
+	}
+	return 0
+}
+
+func smellsLikeOurHelperSpirit(port int, c *http.Client) bool {
+	uri := "http://localhost:" + strconv.Itoa(port) + "/version"
+	log.Println("probing for helper at", uri)
+	resp, err := c.Get(uri)
+	if err != nil {
+		return false
+	}
+	if resp.StatusCode == 200 {
+		ver, err := ioutil.ReadAll(resp.Body)
+		defer resp.Body.Close()
+		if err != nil {
+			return false
+		}
+		if strings.Contains(string(ver), config.ApplicationName) {
+			return true
+		} else {
+			log.Println("Another helper replied to our version request:", string(ver))
+		}
+	}
+	return false
+}
+
+func newLauncher() (*launcher, error) {
+	helperPort := probeHelperPort(initialHelperPort)
+	helperAddr := "http://localhost:" + strconv.Itoa(helperPort)
+	return &launcher{helperAddr}, nil
+}
+
+func (l *launcher) close() error {
+	return nil
+}
+
+func (l *launcher) check() (helpers bool, priviledge bool, err error) {
+	return true, true, nil
+}
+
+func (l *launcher) openvpnStart(flags ...string) error {
+	byteFlags, err := json.Marshal(flags)
+	if err != nil {
+		return err
+	}
+	return l.send("/openvpn/start", byteFlags)
+}
+
+func (l *launcher) openvpnStop() error {
+	return l.send("/openvpn/stop", nil)
+}
+
+func (l *launcher) firewallStart(gateways []bonafide.Gateway) error {
+	ipList := make([]string, len(gateways))
+	for i, gw := range gateways {
+		ipList[i] = gw.IPAddress
+	}
+	byteIPs, err := json.Marshal(ipList)
+	if err != nil {
+		return err
+	}
+	return l.send("/firewall/start", byteIPs)
+}
+
+func (l *launcher) firewallStop() error {
+	return l.send("/firewall/stop", nil)
+}
+
+func (l *launcher) firewallIsUp() bool {
+	var isup bool = false
+	res, err := http.Post(l.helperAddr+"/firewall/isup", "", nil)
+	if err != nil {
+		return false
+	}
+	defer res.Body.Close()
+
+	if res.StatusCode != http.StatusOK {
+		fmt.Printf("Got an error status code for firewall/isup: %v\n", res.StatusCode)
+		isup = false
+	} else {
+		upStr, err := ioutil.ReadAll(res.Body)
+		if err != nil {
+			fmt.Errorf("Error getting body for firewall/isup: %q", err)
+			return false
+		}
+		isup, err = strconv.ParseBool(string(upStr))
+		if err != nil {
+			fmt.Errorf("Error parsing body for firewall/isup: %q", err)
+			return false
+		}
+	}
+	return isup
+}
+
+func (l *launcher) send(path string, body []byte) error {
+	var reader io.Reader
+	if body != nil {
+		reader = bytes.NewReader(body)
+	}
+	res, err := http.Post(l.helperAddr+path, "", reader)
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+
+	resErr, err := ioutil.ReadAll(res.Body)
+	if len(resErr) > 0 {
+		return fmt.Errorf("Helper returned an error: %q", resErr)
+	}
+	return err
+}