IPv4 only support

Author: zpl-zak

.github/workflows/tests.yml

@@ -43,6 +43,21 @@ jobs:
         run: cd build ; .\Debug\enet_test.exe
       - name: Run unit tests with extra peers
         run: cd build ; .\Debug\enet_test_extra_peers.exe
+      - name: Run unit tests with IPv4-only mode
+        run: cd build ; .\Debug\enet_test_ipv4_only.exe
+
+  build-win-ipv4:
+    name: Test Windows (IPv4-only)
+    runs-on: windows-latest
+    needs: [prep]
+    steps:
+      - uses: actions/checkout@v1
+      - name: Run cmake generator with IPv4-only
+        run: cmake -B build_ipv4 -DENET_TEST=1 -DENET_IPV4_ONLY=ON
+      - name: Run Windows build (IPv4-only)
+        run: cmake --build build_ipv4
+      - name: Run unit tests (IPv4-only)
+        run: cd build_ipv4 ; .\Debug\enet_test.exe
 
   build-lin:
     name: Test Linux
@@ -58,6 +73,21 @@ jobs:
         run: build/enet_test
       - name: Test build on Linux with extra peers
         run: build/enet_test_extra_peers
+      - name: Test build on Linux with IPv4-only mode
+        run: build/enet_test_ipv4_only
+
+  build-lin-ipv4:
+    name: Test Linux (IPv4-only)
+    runs-on: ubuntu-latest
+    needs: [prep]
+    steps:
+      - uses: actions/checkout@v1
+      - name: Run cmake generator with IPv4-only
+        run: cmake -B build_ipv4 -DENET_TEST=1 -DENET_IPV4_ONLY=ON
+      - name: Run build on Linux (IPv4-only)
+        run: cmake --build build_ipv4
+      - name: Test build on Linux (IPv4-only)
+        run: build_ipv4/enet_test
 
   build-mac:
     name: Test macOS
@@ -77,18 +107,18 @@ jobs:
   done:
     name: Notify about status
     runs-on: ubuntu-latest
-    needs: [build-mac, build-lin, build-win]
+    needs: [build-mac, build-lin, build-win, build-lin-ipv4, build-win-ipv4]
     if: "always()"
     steps:
       - uses: inlife/actiord-action@v1
-        if: ${{ contains(needs.build-mac.result, 'success') && contains(needs.build-lin.result, 'success') && contains(needs.build-win.result, 'success') }}
+        if: ${{ contains(needs.build-mac.result, 'success') && contains(needs.build-lin.result, 'success') && contains(needs.build-win.result, 'success') && contains(needs.build-lin-ipv4.result, 'success') && contains(needs.build-win-ipv4.result, 'success') }}
         with:
           url: ${{ secrets.ACTIORD_URL }}
           icon: https://avatars1.githubusercontent.com/u/26773913?s=200&v=4
           state: succeeded
 
       - uses: inlife/actiord-action@v1
-        if: ${{ !(contains(needs.build-mac.result, 'success') && contains(needs.build-lin.result, 'success') && contains(needs.build-win.result, 'success')) }}
+        if: ${{ !(contains(needs.build-mac.result, 'success') && contains(needs.build-lin.result, 'success') && contains(needs.build-win.result, 'success') && contains(needs.build-lin-ipv4.result, 'success') && contains(needs.build-win-ipv4.result, 'success')) }}
         with:
           url: ${{ secrets.ACTIORD_URL }}
           discord_token: ${{ secrets.DISCORD_TOKEN }}

CMakeLists.txt

@@ -8,11 +8,16 @@ option(ENET_STATIC "Build enet as a static library" ON)
 option(ENET_SHARED "Build enet as a shared library" OFF)
 option(ENET_TEST  "Build enet tests" ON)
 option(ENET_USE_MORE_PEERS  "Build enet with up to 65k peers support" OFF)
+option(ENET_IPV4_ONLY "Build enet with IPv4-only support (no IPv6)" OFF)
 
 if (ENET_USE_MORE_PEERS)
     add_definitions(-DENET_USE_MORE_PEERS)
 endif()
 
+if (ENET_IPV4_ONLY)
+    add_definitions(-DENET_IPV4_ONLY)
+endif()
+
 # -----------------------------
 # 2) Static library
 # -----------------------------
@@ -96,6 +101,11 @@ if(ENET_TEST)
         ${CMAKE_CURRENT_SOURCE_DIR}/include
         ${CMAKE_CURRENT_SOURCE_DIR}/test/units/include
     )
+
+    # Test with IPv4-only mode
+    add_executable(enet_test_ipv4_only test/build.c)
+    target_link_libraries(enet_test_ipv4_only PRIVATE enet_test_interface)
+    target_compile_definitions(enet_test_ipv4_only PRIVATE ENET_IPV4_ONLY)
 endif()
 
 # -----------------------------