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package main
import (
"context"
"fmt"
"io"
"net"
"net/url"
"os"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
gen "golang.zx2c4.com/wireguard/android/gen"
"golang.zx2c4.com/wireguard/device"
)
const (
IPPROTO_TCP = 6
)
type UidRequest struct {
Data AddrPortPair
RetCh chan string
}
type LibwgServiceImpl struct {
gen.UnimplementedLibwgServer
logger *device.Logger
httpProxy *HttpProxy
uidRequest chan UidRequest
stopReverse chan bool
}
var service *LibwgServiceImpl
var server *grpc.Server
func NewLibwgService(logger *device.Logger) gen.LibwgServer {
return &LibwgServiceImpl{
logger: logger,
uidRequest: make(chan UidRequest),
stopReverse: make(chan bool),
}
}
func StartGrpc(sock_path string, logger *device.Logger) (int, string) {
if server != nil {
return -1, "Already started"
}
if _, err := os.Stat(sock_path); err == nil {
if err := os.RemoveAll(sock_path); err != nil {
return -1, fmt.Sprintf("Cleanup failed: %v %v", sock_path, err)
}
}
listener, err := net.Listen("unix", sock_path)
if err != nil {
return -1, fmt.Sprintf("Listen failed: %v %v", sock_path, err)
}
server = grpc.NewServer()
service = NewLibwgService(logger).(*LibwgServiceImpl)
gen.RegisterLibwgServer(server, service)
go func() {
server.Serve(listener)
}()
logger.Verbosef("gRPC started")
return 0, ""
}
func (e *LibwgServiceImpl) Version(ctx context.Context, req *gen.VersionRequest) (*gen.VersionResponse, error) {
r := &gen.VersionResponse{
Version: Version(),
}
return r, nil
}
func (e *LibwgServiceImpl) StopGrpc(ctx context.Context, req *gen.StopGrpcRequest) (*gen.StopGrpcResponse, error) {
if server != nil {
server.Stop()
server = nil
service = nil
}
r := &gen.StopGrpcResponse{
}
return r, nil
}
func buildStartHttpProxyError(message string) (*gen.StartHttpProxyResponse, error) {
r := &gen.StartHttpProxyResponse{
Error: &gen.Error{
Message: message,
},
}
return r, nil
}
func (e *LibwgServiceImpl) StartHttpProxy(ctx context.Context, req *gen.StartHttpProxyRequest) (*gen.StartHttpProxyResponse, error) {
var listenPort uint16
if e.httpProxy == nil {
e.httpProxy = NewHttpProxy(e.uidRequest, e.logger)
var err error
listenPort, err = e.httpProxy.Start()
if err != nil {
e.httpProxy = nil
return buildStartHttpProxyError(fmt.Sprintf("Http proxy start failed: %v", err))
}
} else {
listenPort = e.httpProxy.GetAddrPort().Port()
}
content := req.GetPacFileContent()
if content != "" {
err := e.httpProxy.SetPacFileContent(content)
if err != nil {
return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileContent: %v (%s)", content))
}
} else {
pacFileUrl, err := url.Parse(req.GetPacFileUrl())
if err != nil {
return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileUrl: %v (%s)", err, req.GetPacFileUrl()))
}
err = e.httpProxy.SetPacFileUrl(pacFileUrl)
if err != nil {
return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileUrl: %v (%s)", err, pacFileUrl))
}
}
r := &gen.StartHttpProxyResponse{
ListenPort: uint32(listenPort),
}
return r, nil
}
func (e *LibwgServiceImpl) StopHttpProxy(ctx context.Context, req *gen.StopHttpProxyRequest) (*gen.StopHttpProxyResponse, error) {
if e.httpProxy == nil {
r := &gen.StopHttpProxyResponse{
Error: &gen.Error{
Message: fmt.Sprintf("Http proxy not running"),
},
}
return r, nil
}
e.httpProxy.Stop()
e.httpProxy = nil
e.stopReverse <- true
r := &gen.StopHttpProxyResponse{}
return r, nil
}
func (e *LibwgServiceImpl) Reverse(stream gen.Libwg_ReverseServer) error {
e.logger.Verbosef("Reverse enter loop")
for e.httpProxy != nil {
var err error
// err := contextError(stream.Context())
err = stream.Context().Err()
if err != nil {
e.logger.Verbosef("Reverse: context: %v", err)
return err
}
select {
case <-e.stopReverse:
e.logger.Verbosef("Reverse: stop")
break
case uidReq := <-e.uidRequest:
addrPortPair := uidReq.Data
local := addrPortPair.local
remote := addrPortPair.remote
r := &gen.ReverseResponse{
Request: &gen.ReverseResponse_Uid{
Uid: &gen.GetConnectionOwnerUidRequest{
Protocol: IPPROTO_TCP,
Local: &gen.InetSocketAddress{
Address: &gen.InetAddress{
Address: local.Addr().AsSlice(),
},
Port: uint32(local.Port()),
},
Remote: &gen.InetSocketAddress{
Address: &gen.InetAddress{
Address: remote.Addr().AsSlice(),
},
Port: uint32(remote.Port()),
},
},
},
}
stream.Send(r)
req, err := stream.Recv()
if err == io.EOF {
e.logger.Verbosef("no more data")
uidReq.RetCh <- ""
break
}
if err != nil {
err = status.Errorf(codes.Unknown, "cannot receive stream request: %v", err)
e.logger.Verbosef("Reverse: %v", err)
uidReq.RetCh <- ""
return err
}
e.logger.Verbosef("Reverse: received, wait: %v", req)
uidReq.RetCh <- req.GetUid().GetPackage()
}
}
e.logger.Verbosef("Reverse returns")
return nil
}
|
