***service.builder.addAddress - 它有啥作用？

Posted 2023-02-19

【中文标题】***service.builder.addAddress - 它有啥作用？

【英文标题】：***service.builder.addAddress - what does it do?***service.builder.addAddress - 它有什么作用？

【发布时间】：2018-09-20 03:50:33

【问题描述】：

根据官方文档：

Add a network address to the *** interface. Both IPv4 and IPv6 addresses are supported. At least one address must be set before calling establish(). Adding an address implicitly allows traffic from that address family (i.e., IPv4 or IPv6) to be routed over the ***. @see #allowFamily

但是，我仍然不清楚，挖掘 dns66 的源代码和 Netguard 的源代码也没有多大帮助。

我不确定它应该是服务器地址，但我想不出其他任何有意义的东西。如果我想在establish()之前实现local***，我应该设置什么地址？

这是 dns66 的来源，但我不明白它为什么要添加这些地址（如果一切“失败”，它怎么知道 192.168.50.1 会起作用）？：

    // Determine a prefix we can use. These are all reserved prefixes for example
    // use, so it's possible they might be blocked.
    for (String prefix : new String[]"192.0.2", "198.51.100", "203.0.113") 
        try 
            builder.addAddress(prefix + ".1", 24);
         catch (IllegalArgumentException e) 
            continue;
        

        format = prefix + ".%d";
        break;
    

    // For fancy reasons, this is the 2001:db8::/120 subnet of the /32 subnet reserved for
    // documentation purposes. We should do this differently. Anyone have a free /120 subnet
    // for us to use?
    byte[] ipv6Template = new byte[]32, 1, 13, (byte) (184 & 0xFF), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;

    if (hasIpV6Servers(config, dnsServers)) 
        try 
            InetAddress addr = Inet6Address.getByAddress(ipv6Template);
            Log.d(TAG, "configure: Adding IPv6 address" + addr);
            builder.addAddress(addr, 120);
         catch (Exception e) 
            e.printStackTrace();

            ipv6Template = null;
        
     else 
        ipv6Template = null;
    

    if (format == null) 
        Log.w(TAG, "configure: Could not find a prefix to use, directly using DNS servers");
        builder.addAddress("192.168.50.1", 24);
    

【参考方案1】：

您基本上添加了Bridge（提供整个互联网的路由器）的IP， 对我来说，这样做就足够了：

import android.net.***Service.Builder;

// ...

boolean is_ip_version_6_supported = true;

Builder builder = new Builder();
builder.setSession("My App's session");

// Specify address of the bridge (or router providing the whole internet),
// to use for IP version 4 and 6 connection capturing (like a firewall).
builder.addAddress("10.1.10.1", 32);
if (is_ip_version_6_supported) 
  builder.addAddress("fd00:1:fd00:1:fd00:1:fd00:1", 128);


// ...

注意：我也是初学者，所以，请随时编辑和改进我的帖子；-) 无论如何，您的应用程序将负责将本地捕获的数据包转发到 *** 服务器并将远程的响应数据包注入本地。