58 lines
2.4 KiB
CMake
58 lines
2.4 KiB
CMake
#.rst
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# FindLibreSSL
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# ------------
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#
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# Detect if OpenSSL is in fact LibreSSL, and recovers LibreSSL version.
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#
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# Requires running FindOpenSSL previously
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#
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# Result Variables
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# ^^^^^^^^^^^^^^^^
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#
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# ``LIBRESSL_VERSION``
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# This is set to ``$major.$minor.$revision$patch`` (e.g. ``2.3.1f``).
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#
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# ``IS_LIBRESSL``
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# Boolean, set to TRUE if LibreSSL, FALSE otherwise
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#
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# just copy/pasted from OpenSSL module with a few substitutions
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if(OPENSSL_INCLUDE_DIR AND EXISTS "${OPENSSL_INCLUDE_DIR}/openssl/opensslv.h")
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file(STRINGS "${OPENSSL_INCLUDE_DIR}/openssl/opensslv.h" libressl_version_str
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REGEX "^#[\t ]*define[\t ]+LIBRESSL_VERSION_NUMBER[\t ]+0x([0-9a-fA-F])+.*")
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if(libressl_version_str)
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# The version number is encoded as 0xMNNFFPPS: major minor fix patch status
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# The status gives if this is a developer or prerelease and is ignored here.
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# Major, minor, and fix directly translate into the version numbers shown in
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# the string. The patch field translates to the single character suffix that
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# indicates the bug fix state, which 00 -> nothing, 01 -> a, 02 -> b and so
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# on.
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string(REGEX REPLACE "^.*LIBRESSL_VERSION_NUMBER[\t ]+0x([0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F]).*$"
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"\\1;\\2;\\3;\\4;\\5" LIBRESSL_VERSION_LIST "${libressl_version_str}")
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list(GET LIBRESSL_VERSION_LIST 0 LIBRESSL_VERSION_MAJOR)
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list(GET LIBRESSL_VERSION_LIST 1 LIBRESSL_VERSION_MINOR)
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from_hex("${LIBRESSL_VERSION_MINOR}" LIBRESSL_VERSION_MINOR)
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list(GET LIBRESSL_VERSION_LIST 2 LIBRESSL_VERSION_FIX)
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from_hex("${LIBRESSL_VERSION_FIX}" LIBRESSL_VERSION_FIX)
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list(GET LIBRESSL_VERSION_LIST 3 LIBRESSL_VERSION_PATCH)
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if (NOT LIBRESSL_VERSION_PATCH STREQUAL "00")
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from_hex("${LIBRESSL_VERSION_PATCH}" _tmp)
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# 96 is the ASCII code of 'a' minus 1
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math(EXPR LIBRESSL_VERSION_PATCH_ASCII "${_tmp} + 96")
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unset(_tmp)
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# Once anyone knows how OpenSSL would call the patch versions beyond 'z'
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# this should be updated to handle that, too. This has not happened yet
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# so it is simply ignored here for now.
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string(ASCII "${LIBRESSL_VERSION_PATCH_ASCII}" LIBRESSL_VERSION_PATCH_STRING)
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endif ()
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set(LIBRESSL_VERSION "${LIBRESSL_VERSION_MAJOR}.${LIBRESSL_VERSION_MINOR}.${LIBRESSL_VERSION_FIX}${LIBRESSL_VERSION_PATCH_STRING}")
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set(IS_LIBRESSL TRUE)
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else ()
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set(IS_LIBRESSL FALSE)
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endif ()
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endif ()
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