Add multi network dialing

constant/network.go

@@ -1,8 +1,50 @@
 package constant
 
+import (
+	"github.com/sagernet/sing/common"
+	F "github.com/sagernet/sing/common/format"
+)
+
 const (
 	InterfaceTypeWIFI     = "wifi"
 	InterfaceTypeCellular = "cellular"
 	InterfaceTypeEthernet = "ethernet"
 	InterfaceTypeOther    = "other"
 )
+
+type NetworkStrategy int
+
+const (
+	NetworkStrategyDefault NetworkStrategy = iota
+	NetworkStrategyFallback
+	NetworkStrategyHybrid
+	NetworkStrategyWIFI
+	NetworkStrategyCellular
+	NetworkStrategyEthernet
+	NetworkStrategyWIFIOnly
+	NetworkStrategyCellularOnly
+	NetworkStrategyEthernetOnly
+)
+
+var (
+	NetworkStrategyToString = map[NetworkStrategy]string{
+		NetworkStrategyDefault:      "default",
+		NetworkStrategyFallback:     "fallback",
+		NetworkStrategyHybrid:       "hybrid",
+		NetworkStrategyWIFI:         "wifi",
+		NetworkStrategyCellular:     "cellular",
+		NetworkStrategyEthernet:     "ethernet",
+		NetworkStrategyWIFIOnly:     "wifi_only",
+		NetworkStrategyCellularOnly: "cellular_only",
+		NetworkStrategyEthernetOnly: "ethernet_only",
+	}
+	StringToNetworkStrategy = common.ReverseMap(NetworkStrategyToString)
+)
+
+func (s NetworkStrategy) String() string {
+	name, loaded := NetworkStrategyToString[s]
+	if !loaded {
+		return F.ToString(int(s))
+	}
+	return name
+}