[Bug network/21668] resolv: res_init cross-thread broadcast introduces race conditions

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https://sourceware.org/bugzilla/show_bug.cgi?id=21668

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=352f4ff9a268b81ef5d4b2413f582565806e4790

commit 352f4ff9a268b81ef5d4b2413f582565806e4790
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Jun 30 21:10:23 2017 +0200

    resolv: Introduce struct resolv_context [BZ #21668]

    struct resolv_context objects provide a temporary resolver context
    which does not change during a name lookup operation.  Only when the
    outmost context is created, the stub resolver configuration is
    verified to be current (at present, only against previous res_init
    calls).  Subsequent attempts to obtain the context will reuse the
    result of the initial verification operation.

    struct resolv_context can also be extended in the future to store
    data which needs to be deallocated during thread cancellation.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                    |   85 ++++++++++++
 include/resolv.h             |   23 ----
 nscd/aicache.c               |   21 ++--
 nss/digits_dots.c            |   21 +++-
 nss/getXXbyYY.c              |   28 ++++-
 nss/getXXbyYY_r.c            |   34 +++--
 nss/getnssent_r.c            |   42 +++++--
 nss/nsswitch.h               |   10 ++
 resolv/Makefile              |    3 +-
 resolv/Versions              |   10 +-
 resolv/compat-gethnamaddr.c  |   95 +++++++++-----
 resolv/nss_dns/dns-canon.c   |   19 ++-
 resolv/nss_dns/dns-host.c    |  104 +++++++++------
 resolv/nss_dns/dns-network.c |   21 ++-
 resolv/res-close.c           |    3 +
 resolv/res_libc.c            |   31 -----
 resolv/res_mkquery.c         |   92 ++++++++-----
 resolv/res_query.c           |  298 ++++++++++++++++++++++++------------------
 resolv/res_send.c            |   44 +++++--
 resolv/res_use_inet6.h       |   49 +++++++
 resolv/resolv-internal.h     |   36 +++++-
 resolv/resolv_context.c      |  201 ++++++++++++++++++++++++++++
 resolv/resolv_context.h      |   95 +++++++++++++
 sysdeps/posix/getaddrinfo.c  |   39 +++---
 24 files changed, 1033 insertions(+), 371 deletions(-)
 create mode 100644 resolv/res_use_inet6.h
 create mode 100644 resolv/resolv_context.c
 create mode 100644 resolv/resolv_context.h

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