From a3054a01dfb6033b75b9ad31189b1202cbedcefc Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Mon, 25 Feb 2019 18:47:12 +0100
Subject: ipc: add base of IPC

---
 service/ipc_server.go | 190 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 190 insertions(+)
 create mode 100644 service/ipc_server.go

(limited to 'service/ipc_server.go')

diff --git a/service/ipc_server.go b/service/ipc_server.go
new file mode 100644
index 00000000..a2a4c9ee
--- /dev/null
+++ b/service/ipc_server.go
@@ -0,0 +1,190 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package service
+
+import (
+	"errors"
+	"golang.org/x/sys/windows"
+	"golang.zx2c4.com/wireguard/windows/conf"
+	"net/rpc"
+	"os"
+	"sync"
+	"sync/atomic"
+)
+
+var managerServices = make(map[*ManagerService]bool)
+var managerServicesLock sync.RWMutex
+var haveQuit uint32
+var quitManagersChan = make(chan struct{}, 1)
+
+type ManagerService struct {
+	notifierHandles     map[windows.Handle]bool
+	notifierHandlesLock sync.RWMutex
+}
+
+func (s *ManagerService) StoredConfig(tunnelName string, config *conf.Config) error {
+	c, err := conf.LoadFromName(tunnelName)
+	if err != nil {
+		return err
+	}
+	*config = *c
+	return nil
+}
+
+func (s *ManagerService) RuntimeConfig(tunnelName string, config *conf.Config) error {
+	//TODO
+
+	return nil
+}
+
+func (s *ManagerService) Start(tunnelName string, state *TunnelState) error {
+	c, err := conf.LoadFromName(tunnelName)
+	if err != nil {
+		return err
+	}
+	path, err := c.Path()
+	if err != nil {
+		return err
+	}
+	return InstallTunnel(path)
+	//TODO: write out *state
+}
+
+func (s *ManagerService) Stop(tunnelName string, state *TunnelState) error {
+	return UninstallTunnel(tunnelName)
+	//TODO: This function should do nothing if the tunnel is already stopped
+	//TODO: write out *state
+}
+
+func (s *ManagerService) Delete(tunnelName string, state *TunnelState) error {
+	err := s.Stop(tunnelName, state)
+	if err != nil {
+		return err
+	}
+	//TODO: wait for stopped somehow
+	if *state != TunnelStopped {
+		return errors.New("Unable to stop tunnel before deleting")
+	}
+	return conf.DeleteName(tunnelName)
+}
+
+func (s *ManagerService) State(tunnelName string, state *TunnelState) error {
+	//TODO
+
+	return nil
+}
+
+func (s *ManagerService) Create(tunnelConfig conf.Config, tunnel *Tunnel) error {
+	err := tunnelConfig.Save()
+	if err != nil {
+		return err
+	}
+	*tunnel = Tunnel{tunnelConfig.Name}
+	return nil
+	//TODO: handle already existing situation
+	//TODO: handle already running and existing situation
+}
+
+func (s *ManagerService) Tunnels(unused uintptr, tunnels *[]Tunnel) error {
+	names, err := conf.ListConfigNames()
+	if err != nil {
+		return err
+	}
+	*tunnels = make([]Tunnel, len(names))
+	for i := 0; i < len(*tunnels); i++ {
+		(*tunnels)[i].Name = names[i]
+	}
+	return nil
+	//TODO: account for running ones that aren't in the configuration store somehow
+}
+
+func (s *ManagerService) Quit(stopTunnelsOnQuit bool, alreadyQuit *bool) error {
+	if !atomic.CompareAndSwapUint32(&haveQuit, 0, 1) {
+		*alreadyQuit = true
+		return nil
+	}
+	*alreadyQuit = false
+
+	// Work around potential race condition of delivering messages to the wrong process by removing from notifications.
+	managerServicesLock.Lock()
+	delete(managerServices, s)
+	managerServicesLock.Unlock()
+
+	if stopTunnelsOnQuit {
+		names, err := conf.ListConfigNames()
+		if err != nil {
+			return err
+		}
+		for _, name := range names {
+			UninstallTunnel(name)
+		}
+	}
+
+	quitManagersChan <- struct{}{}
+	return nil
+}
+
+func (s *ManagerService) RegisterAsNotificationThread(handle windows.Handle, unused *uintptr) error {
+	s.notifierHandlesLock.Lock()
+	s.notifierHandles[handle] = true
+	s.notifierHandlesLock.Unlock()
+	return nil
+}
+
+func (s *ManagerService) UnregisterAsNotificationThread(handle windows.Handle, unused *uintptr) error {
+	s.notifierHandlesLock.Lock()
+	delete(s.notifierHandles, handle)
+	s.notifierHandlesLock.Unlock()
+	return nil
+}
+
+func IPCServerListen(reader *os.File, writer *os.File) error {
+	service := &ManagerService{notifierHandles: make(map[windows.Handle]bool)}
+
+	server := rpc.NewServer()
+	err := server.Register(service)
+	if err != nil {
+		return err
+	}
+
+	go func() {
+		managerServicesLock.Lock()
+		managerServices[service] = true
+		managerServicesLock.Unlock()
+		server.ServeConn(&pipeRWC{reader, writer})
+		managerServicesLock.Lock()
+		delete(managerServices, service)
+		managerServicesLock.Unlock()
+
+	}()
+	return nil
+}
+
+//sys postMessage(hwnd windows.Handle, msg uint, wparam uintptr, lparam uintptr) (err error) = user32.PostMessageW
+
+func notifyAll(f func(handle windows.Handle)) {
+	managerServicesLock.RLock()
+	for m, _ := range managerServices {
+		m.notifierHandlesLock.RLock()
+		for handle, _ := range m.notifierHandles {
+			f(handle)
+		}
+		m.notifierHandlesLock.RUnlock()
+	}
+	managerServicesLock.RUnlock()
+}
+
+func IPCServerNotifyTunnelChange(name string) {
+	notifyAll(func(handle windows.Handle) {
+		//TODO: postthreadmessage
+	})
+}
+
+func IPCServerNotifyTunnelsChange() {
+	notifyAll(func(handle windows.Handle) {
+		postMessage(handle, tunnelsChangedMessage, 0, 0)
+	})
+}
-- 
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