[Bug network/14413] New: nsswitch doesn't implement getaddrinfo(), plugins cannot supply link-local IPv6 addresses with scope id

[Bug network/14413] New: nsswitch doesn't implement getaddrinfo(), plugins cannot supply link-local IPv6 addresses with scope id

[psimerda at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14413

             Bug #: 14413
           Summary: nsswitch doesn't implement getaddrinfo(), plugins
                    cannot supply link-local IPv6 addresses with scope id
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
        AssignedTo: unassigned@sourceware.org
        ReportedBy: psimerda@redhat.com
    Classification: Unclassified


GLIBC's name service switch doesn't provide a way to override getaddressinfo()
which is the only function that supports IPv6 link-local addresses.

IPv6 link-local addresses don't work without the interface name (when
written as text) that then translates to scope id.

http://tools.ietf.org/html/rfc2553

glibc-2.15-37.fc17.x86_64

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot supply link-local IPv6 addresses with scope id

[psimerda at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14413

--- Comment #1 from Pavel Šimerda <psimerda at redhat dot com> 2012-07-27 15:15:46 UTC ---
Fedora bug:

https://bugzilla.redhat.com/show_bug.cgi?id=843054

This is actually needed for link-local name resolution (whatever NSS plugin is
used for it then).

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[psimerda at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14413

Pavel Šimerda <psimerda at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|nsswitch doesn't implement  |nsswitch doesn't implement
                   |getaddrinfo(), plugins      |getaddrinfo(), plugins
                   |cannot supply link-local    |cannot provide full
                   |IPv6 addresses with scope   |getaddrinfo features
                   |id                          |

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[psimerda at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14413

--- Comment #2 from Pavel Šimerda <psimerda at redhat dot com> 2012-07-31 13:31:37 UTC ---
There's another usecase for getaddrinfo() in nsswitch and that is avoiding
problems caused by solutions to bug 12377 including bug 12398. See discussions
in these two bug reports.

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[tore at fud dot no]

http://sourceware.org/bugzilla/show_bug.cgi?id=14413

Tore Anderson <tore at fud dot no> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tore at fud dot no

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[aoliva at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=14413

Alexandre Oliva <aoliva at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |aoliva at sourceware dot org

--- Comment #3 from Alexandre Oliva <aoliva at sourceware dot org> ---
Hi, Pavel,

I assume you're speaking of such addresses as ipv6%zone, as specified in RFC
4007.  That RFC only specifies (hex) numeric addresses in standard ipv6 format,
folowed by a % and a zone id, that may be numeric, an interface name, or
somesuch.

Since the address can only be numeric, without involving any lookups, and that
and zone ids specified in that RFC are supported by existing getaddrinfo core
implementation, what would the point be of introducing a getaddrinfo interface
in the nss plugin interface?

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[psimerda at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14413

--- Comment #4 from Pavel Šimerda <psimerda at redhat dot com> ---
Hi Alexandre,

1) scope_id

There are name services that are capable of returning IPv6 link local addresses
such as Multicast DNS. Those IPv6 link local addresses don't work as expected,
though, as they miss the scope_id.

2) AI_ADDRCONFIG

There are name resolution protocols that should avoid querying for IPv4/IPv6
data according to the system configuration when AI_ADDRCONFIG is set. On the
other hand, for literal address translations, Multicast DNS and /etc/hosts,
this is counter-productive, see the linked bug reports.

3) __nss_gethostbyname*

The gethostbyname4 features are not superset of gethostbyname3 features which
means the API is not satisfactory whichever of them is used.

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https://sourceware.org/bugzilla/show_bug.cgi?id\x17007

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
This error cannot happen with unmodified sources, which it would never try to
include <bits/syscall.h>.

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14413

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[psimerda at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14413

Pavel Šimerda <psimerda at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |16826

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Subject: [Bug network/16826] getaddrinfo() doesn't get scope ID for IPv6-only look-ups
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https://sourceware.org/bugzilla/show_bug.cgi?id=16826

Pavel Šimerda <psimerda at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |14413

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From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/17777] New: [wordsize-64] posix_fadvise64, posix_fallocate64 namespace
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https://sourceware.org/bugzilla/show_bug.cgi?id\x17777

            Bug ID: 17777
           Summary: [wordsize-64] posix_fadvise64, posix_fallocate64
                    namespace
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
                CC: drepper.fsp at gmail dot com

On systems using sysdeps/unix/sysv/linux/wordsize-64, posix_fadvise64 and
posix_fallocate64 (non-POSIX) are strong aliases for posix_fadvise and
posix_fallocate (POSIX), meaning references to the latter wrongly bring in
definitions of the former.  They should be weak aliases.

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[gavin at matician dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14413

Gavin <gavin at matician dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gavin at matician dot com

--- Comment #8 from Gavin <gavin at matician dot com> ---
Confirming that this issue still exists as of 2.31.

ssh -v host.local works:

OpenSSH_8.2p1, OpenSSL 1.1.1f  31 Mar 2020
debug1: Reading configuration data /home/gavin/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to host.local [fe80::88aa:55ff:fec5:dd9%wlan0] port 22.
debug1: Connection established.

ssh -v -6 host.local does not work:

OpenSSH_8.2p1, OpenSSL 1.1.1f  31 Mar 2020
debug1: Reading configuration data /home/gavin/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to host.local [fe80::88aa:55ff:fec5:dd9] port 22.
debug1: connect to address fe80::88aa:55ff:fec5:dd9 port 22: Invalid argument

The first case calls get getaddrinfo() with hints->ai_family=AF_UNSPEC, the
second case calls it with hints->ai_family=AF_INET6.

As a workaround until gethostbyname5 comes along, would it make sense to modify
gethostbyname3 such that it stuffs a whole sockaddr_in6 into h_addr, sets
h_length to sizeof(sockaddr_in6), and glibc can take care of it accordingly
depending on the value of h_length?

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=14413

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sam at gentoo dot org

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[matthijsvanduin at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14413

Matthijs van Duin <matthijsvanduin at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |matthijsvanduin at gmail dot com

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[Bug network/14413] nsswitch doesn't implement getaddrinfo(), plugins cannot provide full getaddrinfo features

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=14413

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |toolchain at gentoo dot org

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