Darwin: Add initial support for macOS

Apple route(4) has some limitations as does getifaddrs(3).
Basically there is no means of being notified of carrier state
because Apple only reports this via media state which is an ioctl.

The good news is that we can build macOS on github so we
can get some BSD traceability at least.

Fixes #524

Author: rsmarples

.github/workflows/build.yml

@@ -10,14 +10,33 @@ env:
   CC: clang
 
 jobs:
+  # macos is a good plaform as we know it ships with a sanitier we can use
+  macos:
+    strategy:
+      matrix:
+        os: [ macos-15, macos-26 ]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - uses: actions/checkout@v6
+
+    - name: Configure
+      run: ./configure --sanitize
+
+    - name: Build
+      run: make
+
+    - name: Tests
+      run: make tests
+
   ubuntu:
     strategy:
       matrix:
         os: [ ubuntu-latest, ubuntu-22.04 ]
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
 
     - name: Configure
       run: ./configure

compat/crypt/sha256.c

@@ -36,7 +36,7 @@
 #ifdef __GLIBC__
 #  include <endian.h>
 #endif
-#ifdef BSD
+#if defined(BSD) || defined(__APPLE__)
 #  ifndef __QNX__
 #    include <sys/endian.h>
 #  endif