On 7/31/19 9:06 AM, Mike Gilbert wrote:
> This works around some strange behavior in glibc's getaddrinfo()
> implementation when the AI_ADDRCONFIG flag is set.
>
> For example:
>
> struct addrinfo *res, hints = { .ai_family = AF_INET, .ai_flags =
> AI_ADDRCONFIG };
> getaddrinfo("localhost", NULL, &hints, &res);
>
> This returns no results if there is no non-loopback interface configured with
> an
> IPv4 address.
>
> Bug: https://bugs.gentoo.org/690758
> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=12377#c13
> Signed-off-by: Mike Gilbert <flop...@gentoo.org>
> ---
> lib/portage/process.py | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/lib/portage/process.py b/lib/portage/process.py
> index dfbda75de..c284c04f3 100644
> --- a/lib/portage/process.py
> +++ b/lib/portage/process.py
> @@ -446,6 +446,29 @@ def spawn(mycommand, env=None, opt_name=None,
> fd_pipes=None, returnpid=False,
> # Everything succeeded
> return 0
>
> +def _configure_dummy_interface():
> + """
> + Configure a dummy interface to work around odd behavior in glibc's
> + getaddrinfo() implementation when the AI_ADDRCONFIG flag is set.
> +
> + For example:
> +
> + struct addrinfo *res, hints = { .ai_family = AF_INET, .ai_flags =
> AI_ADDRCONFIG };
> + getaddrinfo("localhost", NULL, &hints, &res);
> +
> + This returns no results if there is no non-loopback interface
> configured with an
> + IPv4 address.
> +
> + Bug: https://bugs.gentoo.org/690758
> + Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=12377#c13
> + """
> + try:
> +
> subprocess.check_call(['ip','link','add','dummy','type','dummy'])
> + subprocess.check_call(['ip','link','set','dummy','up'])
> +
> subprocess.check_call(['ip','address','add','10.0.0.1/8','dev','dummy'])
> + except subprocess.CalledProcessError:
> + writemsg("Unable to configure dummy network interface\n")
> +
> def _exec(binary, mycommand, opt_name, fd_pipes,
> env, gid, groups, uid, umask, cwd,
> pre_exec, close_fds, unshare_net, unshare_ipc, unshare_mount,
> unshare_pid,
> @@ -637,6 +660,7 @@ def _exec(binary, mycommand, opt_name, fd_pipes,
>
> errno.errorcode.get(e.errno, '?')),
>
> noiselevel=-1)
> sock.close()
> +
> _configure_dummy_interface()
> except AttributeError:
> # unshare() not supported by libc
> pass
> Maybe it will suffice to add the address to the loopback interface? -- Thanks, Zac
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