build: export openssl symbols on windows

Export symbols from the bundled openssl for add-ons to link against.

Fixes: https://github.com/nodejs/node-v0.x-archive/issues/4051
PR-URL: https://github.com/nodejs/node/pull/6274
Reviewed-By: James M Snell <jasnell@gmail.com>

node.gyp

@@ -109,6 +109,13 @@
       }, {
         'node_target_type%': 'executable',
       }],
+      [ 'OS=="win" and '
+        'node_use_openssl=="true" and '
+        'node_shared_openssl=="false"', {
+        'use_openssl_def': 1,
+      }, {
+        'use_openssl_def': 0,
+      }],
     ],
   },
 
@@ -358,6 +365,9 @@
                         '-Wl,--no-whole-archive',
                       ],
                     }],
+                    ['use_openssl_def==1', {
+                      'sources': ['<(SHARED_INTERMEDIATE_DIR)/openssl.def'],
+                    }],
                   ],
                 }],
               ],
@@ -534,6 +544,52 @@
         }],
       ],
     },
+    {
+      'target_name': 'mkssldef',
+      'type': 'none',
+      # TODO(bnoordhuis) Make all platforms export the same list of symbols.
+      # Teach mkssldef.py to generate linker maps that UNIX linkers understand.
+      'conditions': [
+        [ 'use_openssl_def==1', {
+          'variables': {
+            'mkssldef_flags': [
+              # Categories to export.
+              '-CAES,BF,BIO,DES,DH,DSA,EC,ECDH,ECDSA,ENGINE,EVP,HMAC,MD4,MD5,'
+              'NEXTPROTONEG,PSK,RC2,RC4,RSA,SHA,SHA0,SHA1,SHA256,SHA512,TLSEXT',
+              # Defines.
+              '-DWIN32',
+              # Symbols to filter from the export list.
+              '-X^DSO',
+              '-X^_',
+              '-X^private_',
+            ],
+          },
+          'conditions': [
+            ['openssl_fips!=""', {
+              'variables': { 'mkssldef_flags': ['-DOPENSSL_FIPS'] },
+            }],
+          ],
+          'actions': [
+            {
+              'action_name': 'mkssldef',
+              'inputs': [
+                'deps/openssl/openssl/util/libeay.num',
+                'deps/openssl/openssl/util/ssleay.num',
+              ],
+              'outputs': ['<(SHARED_INTERMEDIATE_DIR)/openssl.def'],
+              'action': [
+                'python',
+                'tools/mkssldef.py',
+                '<@(mkssldef_flags)',
+                '-o',
+                '<@(_outputs)',
+                '<@(_inputs)',
+              ],
+            },
+          ],
+        }],
+      ],
+    },
     # generate ETW header and resource files
     {
       'target_name': 'node_etw',

test/addons/openssl-binding/binding.cc

@@ -0,0 +1,35 @@
+#include "node.h"
+#include "../../../src/util.h"
+#include "../../../src/util-inl.h"
+
+#include <assert.h>
+#include <openssl/rand.h>
+
+namespace {
+
+inline void RandomBytes(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  assert(info[0]->IsArrayBufferView());
+  auto view = info[0].As<v8::ArrayBufferView>();
+  auto byte_offset = view->ByteOffset();
+  auto byte_length = view->ByteLength();
+  assert(view->HasBuffer());
+  auto buffer = view->Buffer();
+  auto contents = buffer->GetContents();
+  auto data = static_cast<unsigned char*>(contents.Data()) + byte_offset;
+  assert(RAND_poll());
+  auto rval = RAND_bytes(data, static_cast<int>(byte_length));
+  info.GetReturnValue().Set(rval > 0);
+}
+
+inline void Initialize(v8::Local<v8::Object> exports,
+                       v8::Local<v8::Value> module,
+                       v8::Local<v8::Context> context) {
+  auto isolate = context->GetIsolate();
+  auto key = v8::String::NewFromUtf8(isolate, "randomBytes");
+  auto value = v8::FunctionTemplate::New(isolate, RandomBytes)->GetFunction();
+  assert(exports->Set(context, key, value).IsJust());
+}
+
+}  // anonymous namespace
+
+NODE_MODULE_CONTEXT_AWARE(binding, Initialize)

test/addons/openssl-binding/binding.gyp

@@ -0,0 +1,9 @@
+{
+  'targets': [
+    {
+      'target_name': 'binding',
+      'sources': ['binding.cc'],
+      'include_dirs': ['../../../deps/openssl/openssl/include'],
+    },
+  ]
+}

test/addons/openssl-binding/test.js

@@ -0,0 +1,8 @@
+'use strict';
+
+require('../../common');
+const assert = require('assert');
+const binding = require('./build/Release/binding');
+const bytes = new Uint8Array(1024);
+assert(binding.randomBytes(bytes));
+assert(bytes.reduce((v, a) => v + a) > 0);

tools/mkssldef.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+
+from __future__ import print_function
+import re
+import sys
+
+categories = []
+defines = []
+excludes = []
+
+if __name__ == '__main__':
+  out = sys.stdout
+  filenames = sys.argv[1:]
+
+  while filenames and filenames[0].startswith('-'):
+    option = filenames.pop(0)
+    if option == '-o': out = open(filenames.pop(0), 'w')
+    elif option.startswith('-C'): categories += option[2:].split(',')
+    elif option.startswith('-D'): defines += option[2:].split(',')
+    elif option.startswith('-X'): excludes += option[2:].split(',')
+
+  excludes = map(re.compile, excludes)
+  exported = []
+
+  for filename in filenames:
+    for line in open(filename).readlines():
+      name, _, meta, _ = re.split('\s+', line)
+      if any(map(lambda p: p.match(name), excludes)): continue
+      meta = meta.split(':')
+      assert meta[0] in ('EXIST', 'NOEXIST')
+      assert meta[2] in ('FUNCTION', 'VARIABLE')
+      if meta[0] != 'EXIST': continue
+      if meta[2] != 'FUNCTION': continue
+      def satisfy(expr, rules):
+        def test(expr):
+          if expr.startswith('!'): return not expr[1:] in rules
+          return expr == '' or expr in rules
+        return all(map(test, expr.split(',')))
+      if not satisfy(meta[1], defines): continue
+      if not satisfy(meta[3], categories): continue
+      exported.append(name)
+
+  print('EXPORTS', file=out)
+  for name in sorted(exported): print('    ', name, file=out)