icmp and raw sockets on linux

[Jamie Le Tual]

Although I've only just sent in the pdf form for an ora, I've already
submitted a pull request, https://github.com/openjdk/jdk/pull/1502 wherein
an attempt is first made to use an IPPROTO_ICMP socket before falling back
on RAW_SOCK and finally tcp echo.

I suppose now I have to wait until I am able to open an issue in the bug
tracker so I can associate the pull request to it.

Does anyone know what a unit test for this might look like? To cover the
use cases the code has to be invoked by both a privileged and unprivileged
user, and I'm not sure how to go about setting up a unit test.




On Sun, 29 Nov 2020 at 02:37, Alan Bateman <Alan.Bateman at oracle.com> wrote:

> On 28/11/2020 02:42, Jamie Le Tual wrote:
>
> :
>
> It all seems to check out (at least on my machine,) the icmp packets look
> good in wireshark, so the first thing I'm wondering is what the catch must
> be, because this seems like a simple solution and I'm wondering why it was
> never done like this.
>
> The isReachable methods were added in Java 5 so they pre-date the kernel
> support for non-privileged ICMP. It seems a good idea to explore this now
> and work through any implications for using it.
>
> -Alan.
>
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