support hosts

[ayanamist]

fix #2150

[Mygod]

In our use case, parseNumericAddress is performance critical as it needs to be invoked once for every rule in ACL. That's why we are using inet_pton and parseNumericAddress as a fallback.

You can attach some benchmark for Inetaddresses or keep that in a separate pull request.

[ayanamist]

@Mygod 我这个是给解析hosts文件用的，不可能单独剥离出来。另外实现是从guava里抠的（代码里注释写了port from），不是我自己写的。如果你们不用，那就用另外的实现好了。
目前hosts的实现已经基本ready了，我本来是想着周末测测再推上来的，只是刚好看到你们有类似的需求，所以提前push上来。

[Mygod]

Use this for now:

shadowsocks-android/core/src/main/java/com/github/shadowsocks/utils/Utils.kt

Lines 57 to 58 in 6b60d91

	fun String?.parseNumericAddress(): InetAddress? = Os.inet_pton(OsConstants.AF_INET, this)
	?: Os.inet_pton(OsConstants.AF_INET6, this)?.let { parseNumericAddress.invoke(null, this) as InetAddress }

[ayanamist]

Use this for now:

shadowsocks-android/core/src/main/java/com/github/shadowsocks/utils/Utils.kt

Lines 57 to 58 in 6b60d91

fun String?.parseNumericAddress(): InetAddress? = Os.inet_pton(OsConstants.AF_INET, this)
?: Os.inet_pton(OsConstants.AF_INET6, this)?.let { parseNumericAddress.invoke(null, this) as InetAddress }

已经改了。

[Mygod]

This seems to be missing STORAGE permission but it doesn't matter. Also here's why I don't support using external storage.

[ayanamist]

This seems to be missing STORAGE permission but it doesn't matter. Also here's why I don't support using external storage.

我是看到这里 https://developer.android.com/reference/android/content/Context.html#getExternalFilesDir(java.lang.String) 提到的

Starting in Build.VERSION_CODES.KITKAT, no permissions are required to read or write to the returned path; it's always accessible to the calling app.

所以特意没有声明权限。因为这个目录在sdcard里，Q之前，可以用Solid Explorer等编辑器来直接修改这个文件，类似root后的手机直接修改/etc/hosts一样。这也是因为我没有写UI代码能力的局限之处。如果有UI了，可以不用这样做。

[madeye]

Can we follow the profile import logic to import hosts file?

[Mygod]

I will make it a global option.

[ayanamist]

Can we follow the profile import logic to import hosts file?

这好像是ui部分的改动？这个我无能为力了

[Mygod]

@ayanamist Thank you for your contribution. Please review the code. And before you ask, yes I did expect you to write these UI codes. 😄

I had to rebase this onto preference-1.1 branch (see #2162), which sadly will take a while before it can be merged, but I see you are compiling this repo by yourself so it should not be an issue for you.

I have not tested the hosts functionality yet, you can look into that. Also you are welcome to contribute a similar UI for TV (if not I will do it later).

[ayanamist]

我看现在是用merge的方式把代码从preference-1.1分支合并过来，需要我用rebase的方式重新弄一下吗？另外ui部分我确实搞不定，完全没有android ui知识……

[Mygod]

No everything is fine now. Just give this ui a spin and see if it works properly.

[Mygod]

@madeye @ayanamist Please review the changes and do some testing.

[madeye]

Yeah, I will check this later.

[madeye]

Cool! Test it locally and works very well.

[madeye]

LGTM

[Mygod]

@ayanamist Thoughts? If not, we will merge this into #2162.

[ayanamist]

@ayanamist Thoughts? If not, we will merge this into #2162.

LGTM