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CONTRIBUTING.md

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Summary

This instruction describes how to pragmatically upgrade the openssl d-bindings to match the C-headers version, in this case current version is 1.1.0h.

Steps

Preparation

  1. Get d-step tool with: 
    curl \
    --location \
    https://github.com/jacob-carlborg/dstep/releases/download/v1.0.0/dstep-1.0.0-linux-x86_64.tar.xz \
    | tar -x --xz --location /usr/local/bin
    See more @ https://github.com/jacob-carlborg/dstep/releases.
  2. Clone openssl with git clone https://github.com/openssl/openssl and checkout correct tag, example cd openssl && git checkout OpenSSL_1_1_0h.
  3. Headers with suffix ".h.in" need to be parsed to .h before generation, Configure openssl with ./configure and build generated file with make build_generated.

Check dependencies

A good approach is to convert the files in ascending order for no of dependencies. Example when converting x509, use order: x509_vfy.h which is used by 1 other file, x509v3.h is used by 3 other files, x509.h is used by 11 other files.

grep -r 'include <openssl/x509_vfy.h>$' C/
grep -r 'include <openssl/x509v3.h>$' C/
grep -r 'include <openssl/x509.h>$' C/

Generate module from C header

  1. Generate d-module from the openssl c-header with dstep --space-after-function-name=false -Iinclude/ include/openssl/<file>. Commit the change.

Manual patching

Below is a checklist for common known issues which needs manual work:

  1. d-step doesn't resolve includes. Translate "import" statements from #include in header-file accordingly, and possible check in the old .d-file for special cases.
  2. Function aliases in C-headers without argument list, example #define alias-name function are generated as enum types. This gives compilation error similar to "missing argument for parameter #1". Replace "enum" with "alias" accordingly.
  3. Many struct definitions is removed, instead a declaration ia added into types.d, Example grep -r 'struct X509_pubkey_st' C/ shows that struct definition is removed from x509.h and instead a declaration is added in types.h. Other types might be removed, check the header-file and adjust accordingly if the type is missing when compiling.
  4. Check the header-file for "ifdef|ifndef", search for "OPENSSL_*" where some statements has historically been translated into "version" in d-modules.
  5. Macros STACK_OF, DEFINE_STACK_OF: in version 1.1.0h the macro STACK_OF in safestack.d has changed. During generation it's properly expanded into a type prefixed with stack_st. Since other dependent modules might not be uplifted, a declaration sometimes need to be inserted to make it compile. It will result in "type missing "stack_st_...". Check in which header the macro DEFINE_STACK_OF(<type>) is defined in and manually add struct stack_st_<type-name> to make it compile. However these functions will not work properly during linkage until safestack.d is uplifted, see macro DEFINE_STACK_OF in safestack.h.