[Bug network/14965] New: remove AI_ADDRCONFIG from getaddrinfo() flags

[Bug network/14965] New: remove AI_ADDRCONFIG from getaddrinfo() flags

[psimerda at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14965

             Bug #: 14965
           Summary: remove AI_ADDRCONFIG from getaddrinfo() flags
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
        AssignedTo: unassigned@sourceware.org
        ReportedBy: psimerda@redhat.com
    Classification: Unclassified


AI_ADDRCONFIG can be beneficial to applications when it's only used for the
connect(), sendto(), etc. See a detailed description of this topic:

https://fedoraproject.org/wiki/Networking/NameResolution/ADDRCONFIG

The defaults are only used when an application doesn't supply hints. But,
virtually any application that wants to connect() wants to also specify at
least the transport protocol (TCP, UDP). That means that applications that
would benefit from AI_ADDRCONFIG won't use the defaults anyway.

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[Bug network/14965] remove AI_ADDRCONFIG from default getaddrinfo() flags

[psimerda at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14965

Pavel Šimerda <psimerda at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|remove AI_ADDRCONFIG from   |remove AI_ADDRCONFIG from
                   |getaddrinfo() flags         |default getaddrinfo() flags

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[Bug network/14965] remove AI_ADDRCONFIG from default getaddrinfo() flags

[psimerda at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14965

--- Comment #1 from Pavel Šimerda <psimerda at redhat dot com> 2013-01-03 14:53:54 UTC ---
Created attachment 6793
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6793
getaddrinfo: use zero ai_flags by default

    According to POSIX1-2008, AI_V4MAPPED flag shall be ignored unless
ai_family
    equals AF_INET6. In the default hints, ai_family is AF_UNSPEC. Therefore
    AI_V4MAPPED is redundant.

    AI_ADDRCONFIG can potentially be beneficial to applications that use
    getaddrinfo() results to immediately call connect(), sendto() and
    similar functions to avoid querying redundant DNS records according
    to the current address configuration.

    Those applications will also need to specify ai_socktype and/or
    ai_protocol and therefore will not use hints=NULL. As AI_DEFAULT is not
    a part of the public API, such applications will not be able to use the
    default flags at all.

    Please note that POSIX1-2008 doesn't define any default flags at all.

    Resolves: #14415, #14965

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[Bug network/14965] remove AI_ADDRCONFIG from default getaddrinfo() flags

[psimerda at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14965

Pavel Šimerda <psimerda at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at sourceware    |psimerda at redhat dot com
                   |dot org                     |

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[Bug network/14965] remove AI_ADDRCONFIG from default getaddrinfo() flags

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14965

Florian Weimer <fweimer at redhat dot com> changed:

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

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