switch core support

add nekobox_core

linux: use sing-box for vpn

go/pkg/iphlpapi/route_windows.go

@@ -0,0 +1,87 @@
+package iphlpapi
+
+import (
+	"fmt"
+	"net"
+	"unsafe"
+)
+
+/*
+对于路由表，预期的方法是：
+查询 0.0.0.0/0 获得原始默认路由
+然后为 vpn 服务器添加默认路由
+之后就根据需要下发vpn路由完事。
+对于0.0.0.0/0 vpn 路由，可以尝试更低的跃点数，也可以尝试分为2个。
+重新连接时可以删除vpn接口的所有非链路路由表。
+路由表格式：
+目标网络 uint32   掩码位数 byte低6位  vpn/默认网关  byte 高1位
+*/
+
+// 太低的值添加路由时会返回 106 错误
+const routeMetric = 93
+
+type RouteRow struct {
+	ForwardDest      [4]byte //目标网络
+	ForwardMask      [4]byte //掩码
+	ForwardPolicy    uint32  //ForwardPolicy:0x0
+	ForwardNextHop   [4]byte //网关
+	ForwardIfIndex   uint32  // 网卡索引 id
+	ForwardType      uint32  //3 本地接口  4 远端接口
+	ForwardProto     uint32  //3静态路由 2本地接口 5EGP网关
+	ForwardAge       uint32  //存在时间 秒
+	ForwardNextHopAS uint32  //下一跳自治域号码 0
+	ForwardMetric1   uint32  //度量衡(跃点数)，根据 ForwardProto 不同意义不同。
+	ForwardMetric2   uint32
+	ForwardMetric3   uint32
+	ForwardMetric4   uint32
+	ForwardMetric5   uint32
+}
+
+func (rr *RouteRow) GetForwardDest() net.IP {
+	return net.IP(rr.ForwardDest[:])
+}
+func (rr *RouteRow) GetForwardMask() net.IP {
+	return net.IP(rr.ForwardMask[:])
+}
+func (rr *RouteRow) GetForwardNextHop() net.IP {
+	return net.IP(rr.ForwardNextHop[:])
+}
+
+func GetRoutes() ([]RouteRow, error) {
+	buf := make([]byte, 4+unsafe.Sizeof(RouteRow{}))
+	buf_len := uint32(len(buf))
+
+	proc_getIpForwardTable.Call(uintptr(unsafe.Pointer(&buf[0])),
+		uintptr(unsafe.Pointer(&buf_len)), 0)
+
+	var r1 uintptr
+	for i := 0; i < 5; i++ {
+		buf = make([]byte, buf_len)
+		r1, _, _ = proc_getIpForwardTable.Call(uintptr(unsafe.Pointer(&buf[0])),
+			uintptr(unsafe.Pointer(&buf_len)), 0)
+		if r1 == 122 {
+			continue
+		}
+		break
+	}
+
+	if r1 != 0 {
+		return nil, fmt.Errorf("Failed to get the routing table, return value：%v", r1)
+	}
+
+	num := *(*uint32)(unsafe.Pointer(&buf[0]))
+	routes := make([]RouteRow, num)
+	sr := uintptr(unsafe.Pointer(&buf[0])) + unsafe.Sizeof(num)
+	rowSize := unsafe.Sizeof(RouteRow{})
+
+	// 安全检查
+	if len(buf) < int((unsafe.Sizeof(num) + rowSize*uintptr(num))) {
+		return nil, fmt.Errorf("System error: GetIpForwardTable returns the number is too long, beyond the buffer。")
+	}
+
+	for i := uint32(0); i < num; i++ {
+		routes[i] = *((*RouteRow)(unsafe.Pointer(sr + (rowSize * uintptr(i)))))
+	}
+
+	return routes, nil
+}