sing-box/experimental/libbox/service.go

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2022-10-25 04:55:00 +00:00
package libbox
import (
"context"
"net/netip"
"os"
"syscall"
"github.com/sagernet/sing-box"
"github.com/sagernet/sing-box/common/process"
"github.com/sagernet/sing-box/experimental/libbox/internal/procfs"
"github.com/sagernet/sing-box/experimental/libbox/platform"
"github.com/sagernet/sing-tun"
"github.com/sagernet/sing/common/control"
E "github.com/sagernet/sing/common/exceptions"
N "github.com/sagernet/sing/common/network"
)
type BoxService struct {
ctx context.Context
cancel context.CancelFunc
instance *box.Box
}
func NewService(configContent string, platformInterface PlatformInterface) (*BoxService, error) {
options, err := parseConfig(configContent)
if err != nil {
return nil, err
}
options.PlatformInterface = &platformInterfaceWrapper{platformInterface, platformInterface.UseProcFS()}
ctx, cancel := context.WithCancel(context.Background())
instance, err := box.New(ctx, options)
if err != nil {
cancel()
return nil, E.Cause(err, "create service")
}
return &BoxService{
ctx: ctx,
cancel: cancel,
instance: instance,
}, nil
}
func (s *BoxService) Start() error {
return s.instance.Start()
}
func (s *BoxService) Close() error {
s.cancel()
return s.instance.Close()
}
var _ platform.Interface = (*platformInterfaceWrapper)(nil)
type platformInterfaceWrapper struct {
iif PlatformInterface
useProcFS bool
}
func (w *platformInterfaceWrapper) AutoDetectInterfaceControl() control.Func {
return func(network, address string, conn syscall.RawConn) error {
return control.Raw(conn, func(fd uintptr) error {
return w.iif.AutoDetectInterfaceControl(int32(fd))
})
}
}
func (w *platformInterfaceWrapper) OpenTun(options tun.Options) (tun.Tun, error) {
if len(options.IncludeUID) > 0 || len(options.ExcludeUID) > 0 {
return nil, E.New("android: unsupported uid options")
}
if len(options.IncludeAndroidUser) > 0 {
return nil, E.New("android: unsupported android_user option")
}
optionsWrapper := tunOptions(options)
tunInterface, err := w.iif.OpenTun(&optionsWrapper)
if err != nil {
return nil, err
}
tunFd := tunInterface.FileDescriptor()
return &nativeTun{
tunFd: int(tunFd),
tunFile: os.NewFile(uintptr(tunFd), "tun"),
tunMTU: options.MTU,
closer: tunInterface,
}, nil
}
func (w *platformInterfaceWrapper) Write(p []byte) (n int, err error) {
w.iif.WriteLog(string(p))
return len(p), nil
}
func (w *platformInterfaceWrapper) FindProcessInfo(ctx context.Context, network string, source netip.AddrPort, destination netip.AddrPort) (*process.Info, error) {
var uid int32
if w.useProcFS {
uid = procfs.ResolveSocketByProcSearch(network, source, destination)
if uid == -1 {
return nil, E.New("procfs: not found")
}
} else {
var ipProtocol int32
switch N.NetworkName(network) {
case N.NetworkTCP:
ipProtocol = syscall.IPPROTO_TCP
case N.NetworkUDP:
ipProtocol = syscall.IPPROTO_UDP
default:
return nil, E.New("unknown network: ", network)
}
var err error
uid, err = w.iif.FindConnectionOwner(ipProtocol, source.Addr().String(), int32(source.Port()), destination.Addr().String(), int32(destination.Port()))
if err != nil {
return nil, err
}
}
packageName, _ := w.iif.PackageNameByUid(uid)
return &process.Info{UserId: uid, PackageName: packageName}, nil
}