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sslutil: synchronize hostname matching logic with CPython...

sslutil: synchronize hostname matching logic with CPython sslutil contains its own hostname matching logic. CPython has code for the same intent. However, it is only available to Python 2.7.9+ (or distributions that have backported 2.7.9's ssl module improvements). This patch effectively imports CPython's hostname matching code from its ssl.py into sslutil.py. The hostname matching code itself is pretty similar. However, the DNS name matching code is much more robust and spec conformant. As the test changes show, this changes some behavior around wildcard handling and IDNA matching. The new behavior allows wildcards in the middle of words (e.g. 'f*.com' matches 'foo.com') This is spec compliant according to RFC 6125 Section 6.5.3 item 3. There is one test where the matcher is more strict. Before, '*.a.com' matched '.a.com'. Now it doesn't match. Strictly speaking this is a security vulnerability.

Matt Harbison - - Load All Authors

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      https://bz.mercurial-scm.org/672

      # 0-2-4

      #  \ \ \

      #   1-3-5

      #

      # rename in #1, content change in #4.

        $ hg init

        $ touch 1

        $ touch 2

        $ hg commit -Am init  # 0

        adding 1

        adding 2

        $ hg rename 1 1a

        $ hg commit -m rename # 1

        $ hg co -C 0

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        $ echo unrelated >> 2

        $ hg ci -m unrelated1 # 2

        created new head

        $ hg merge --debug 1

          searching for copies back to rev 1

          unmatched files in other:

           1a

          all copies found (* = to merge, ! = divergent, % = renamed and deleted):

           src: '1' -> dst: '1a' 

          checking for directory renames

        resolving manifests

         branchmerge: True, force: False, partial: False

         ancestor: 81f4b099af3d, local: c64f439569a9+, remote: c12dcd37c90a

         1: other deleted -> r

        removing 1

         1a: remote created -> g

        getting 1a

         2: remote unchanged -> k

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        (branch merge, don't forget to commit)

        $ hg ci -m merge1 # 3

        $ hg co -C 2

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        $ echo hello >> 1

        $ hg ci -m unrelated2 # 4

        created new head

        $ hg co -C 3

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        $ hg merge -y --debug 4

          searching for copies back to rev 1

          unmatched files in local:

           1a

          all copies found (* = to merge, ! = divergent, % = renamed and deleted):

           src: '1' -> dst: '1a' *

          checking for directory renames

        resolving manifests

         branchmerge: True, force: False, partial: False

         ancestor: c64f439569a9, local: e327dca35ac8+, remote: 746e9549ea96

         preserving 1a for resolve of 1a

        starting 4 threads for background file closing (?)

         1a: local copied/moved from 1 -> m (premerge)

        picked tool ':merge' for 1a (binary False symlink False changedelete False)

        merging 1a and 1 to 1a

        my 1a@e327dca35ac8+ other 1@746e9549ea96 ancestor 1@c64f439569a9

         premerge successful

        0 files updated, 1 files merged, 0 files removed, 0 files unresolved

        (branch merge, don't forget to commit)

        $ hg co -C 4

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        $ hg merge -y --debug 3

          searching for copies back to rev 1

          unmatched files in other:

           1a

          all copies found (* = to merge, ! = divergent, % = renamed and deleted):

           src: '1' -> dst: '1a' *

          checking for directory renames

        resolving manifests

         branchmerge: True, force: False, partial: False

         ancestor: c64f439569a9, local: 746e9549ea96+, remote: e327dca35ac8

         preserving 1 for resolve of 1a

        removing 1

        starting 4 threads for background file closing (?)

         1a: remote moved from 1 -> m (premerge)

        picked tool ':merge' for 1a (binary False symlink False changedelete False)

        merging 1 and 1a to 1a

        my 1a@746e9549ea96+ other 1a@e327dca35ac8 ancestor 1@c64f439569a9

         premerge successful

        0 files updated, 1 files merged, 0 files removed, 0 files unresolved

        (branch merge, don't forget to commit)

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				https://bz.mercurial-scm.org/672

				# 0-2-4
				# \ \ \
				# 1-3-5
				#
				# rename in #1, content change in #4.

				$ hg init

				$ touch 1
				$ touch 2
				$ hg commit -Am init # 0
				adding 1
				adding 2

				$ hg rename 1 1a
				$ hg commit -m rename # 1

				$ hg co -C 0
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved

				$ echo unrelated >> 2
				$ hg ci -m unrelated1 # 2
				created new head

				$ hg merge --debug 1
				searching for copies back to rev 1
				unmatched files in other:
				1a
				all copies found (* = to merge, ! = divergent, % = renamed and deleted):
				src: '1' -> dst: '1a'
				checking for directory renames
				resolving manifests
				branchmerge: True, force: False, partial: False
				ancestor: 81f4b099af3d, local: c64f439569a9+, remote: c12dcd37c90a
				1: other deleted -> r
				removing 1
				1a: remote created -> g
				getting 1a
				2: remote unchanged -> k
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved
				(branch merge, don't forget to commit)

				$ hg ci -m merge1 # 3

				$ hg co -C 2
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved

				$ echo hello >> 1
				$ hg ci -m unrelated2 # 4
				created new head

				$ hg co -C 3
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved

				$ hg merge -y --debug 4
				searching for copies back to rev 1
				unmatched files in local:
				1a
				all copies found (* = to merge, ! = divergent, % = renamed and deleted):
				src: '1' -> dst: '1a' *
				checking for directory renames
				resolving manifests
				branchmerge: True, force: False, partial: False
				ancestor: c64f439569a9, local: e327dca35ac8+, remote: 746e9549ea96
				preserving 1a for resolve of 1a
				starting 4 threads for background file closing (?)
				1a: local copied/moved from 1 -> m (premerge)
				picked tool ':merge' for 1a (binary False symlink False changedelete False)
				merging 1a and 1 to 1a
				my 1a@e327dca35ac8+ other 1@746e9549ea96 ancestor 1@c64f439569a9
				premerge successful
				0 files updated, 1 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)

				$ hg co -C 4
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved

				$ hg merge -y --debug 3
				searching for copies back to rev 1
				unmatched files in other:
				1a
				all copies found (* = to merge, ! = divergent, % = renamed and deleted):
				src: '1' -> dst: '1a' *
				checking for directory renames
				resolving manifests
				branchmerge: True, force: False, partial: False
				ancestor: c64f439569a9, local: 746e9549ea96+, remote: e327dca35ac8
				preserving 1 for resolve of 1a
				removing 1
				starting 4 threads for background file closing (?)
				1a: remote moved from 1 -> m (premerge)
				picked tool ':merge' for 1a (binary False symlink False changedelete False)
				merging 1 and 1a to 1a
				my 1a@746e9549ea96+ other 1a@e327dca35ac8 ancestor 1@c64f439569a9
				premerge successful
				0 files updated, 1 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)