Merged revisions 270658 via svnmerge from

Merged revisions 270658 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk

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  r270658 | twilson | 2010-06-15 15:18:04 -0500 (Tue, 15 Jun 2010) | 20 lines

  Make contactdeny apply to src ip when nat=yes

  chan_sip's "contactdeny" feature screens the "to be registered contact".
  In case of nat=yes it should not use the address information from the
  Contact header (which is not used at all for routing), but the source
  IP address of the request.

  Thus, if nat=yes and a client sends a request from a denied IP address
  (e.g. by spoofing the src-IP address) it can bypass the screening.

  This commit makes contactdeny apply to the src ip when nat=yes instead.

  (closes issue #17276)
  Reported by: klaus3000
  Patches:
        patch-asterisk-trunk-contactdeny.txt uploaded by klaus3000 (license 65)
  Tested by: klaus3000

  Review: [full review board URL with trailing slash]
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@270693 65c4cc65-6c06-0410-ace0-fbb531ad65f3