platform: Refactoring libbox to use gRPC-based protocol

route/platform_searcher.go

@@ -0,0 +1,45 @@
+package route
+
+import (
+	"context"
+	"net/netip"
+	"syscall"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/process"
+	N "github.com/sagernet/sing/common/network"
+)
+
+type platformSearcher struct {
+	platform adapter.PlatformInterface
+}
+
+func newPlatformSearcher(platform adapter.PlatformInterface) process.Searcher {
+	return &platformSearcher{platform: platform}
+}
+
+func (s *platformSearcher) FindProcessInfo(ctx context.Context, network string, source netip.AddrPort, destination netip.AddrPort) (*adapter.ConnectionOwner, error) {
+	if !s.platform.UsePlatformConnectionOwnerFinder() {
+		return nil, process.ErrNotFound
+	}
+
+	var ipProtocol int32
+	switch N.NetworkName(network) {
+	case N.NetworkTCP:
+		ipProtocol = syscall.IPPROTO_TCP
+	case N.NetworkUDP:
+		ipProtocol = syscall.IPPROTO_UDP
+	default:
+		return nil, process.ErrNotFound
+	}
+
+	request := &adapter.FindConnectionOwnerRequest{
+		IpProtocol:         ipProtocol,
+		SourceAddress:      source.Addr().String(),
+		SourcePort:         int32(source.Port()),
+		DestinationAddress: destination.Addr().String(),
+		DestinationPort:    int32(destination.Port()),
+	}
+
+	return s.platform.FindConnectionOwner(request)
+}