源码快照 @ 2026-09-01 (source-only, 剔除非源码素材)

packages/device-link/networkchange/route_linux_parser.go

@@ -0,0 +1,94 @@
+//go:build linux && !android
+
+package networkchange
+
+import (
+	"encoding/hex"
+	"errors"
+	"strconv"
+	"strings"
+)
+
+func parseLinuxIPv4Routes(data []byte) ([]string, error) {
+	entries := make([]string, 0, 1)
+	for lineNumber, line := range strings.Split(string(data), "\n") {
+		fields := strings.Fields(line)
+		if len(fields) == 0 || (lineNumber == 0 && fields[0] == "Iface") {
+			continue
+		}
+		if len(fields) < 8 {
+			return nil, errors.New("default route sample failed")
+		}
+		destination, gateway, flags, metric, mask := fields[1], fields[2], fields[3], fields[6], fields[7]
+		if !isHex(destination, 8) || !isHex(mask, 8) {
+			return nil, errors.New("default route sample failed")
+		}
+		if !isHexZero(destination, 8) || !isHexZero(mask, 8) {
+			continue
+		}
+		if !isHexUint32(flags) || !isHex(gateway, 8) || !isDecimal(metric) {
+			return nil, errors.New("default route sample failed")
+		}
+		if !hasHexFlag(flags, 1) {
+			continue
+		}
+		entries = append(entries, "default-route:ipv4|"+fields[0]+"|"+strings.ToUpper(gateway)+"|"+metric+"|"+strings.ToUpper(flags))
+	}
+	return entries, nil
+}
+
+func parseLinuxIPv6Routes(data []byte) ([]string, error) {
+	entries := make([]string, 0, 1)
+	for _, line := range strings.Split(string(data), "\n") {
+		fields := strings.Fields(line)
+		if len(fields) == 0 {
+			continue
+		}
+		if len(fields) < 10 {
+			return nil, errors.New("default route sample failed")
+		}
+		destination, prefix, nextHop := fields[0], fields[1], fields[4]
+		if !isHex(destination, 32) || !isHex(prefix, 2) {
+			return nil, errors.New("default route sample failed")
+		}
+		if !isHexZero(destination, 32) || !isHexZero(prefix, 2) {
+			continue
+		}
+		metric, flags := fields[5], fields[8]
+		if !isHex(nextHop, 32) || !isHex(metric, 8) || !isHex(flags, 8) {
+			return nil, errors.New("default route sample failed")
+		}
+		if !hasHexFlag(flags, 1) {
+			continue
+		}
+		entries = append(entries, "default-route:ipv6|"+fields[9]+"|"+strings.ToUpper(nextHop)+"|"+strings.ToUpper(metric)+"|"+strings.ToUpper(flags))
+	}
+	return entries, nil
+}
+
+func isHex(value string, length int) bool {
+	if len(value) != length {
+		return false
+	}
+	_, err := hex.DecodeString(value)
+	return err == nil
+}
+
+func isHexZero(value string, length int) bool {
+	return isHex(value, length) && strings.Trim(value, "0") == ""
+}
+
+func hasHexFlag(value string, flag byte) bool {
+	parsed, err := strconv.ParseUint(value, 16, 32)
+	return err == nil && parsed&uint64(flag) != 0
+}
+
+func isHexUint32(value string) bool {
+	_, err := strconv.ParseUint(value, 16, 32)
+	return err == nil
+}
+
+func isDecimal(value string) bool {
+	_, err := strconv.ParseUint(value, 10, 32)
+	return err == nil
+}