WIP: Use "D-Bus over TCP/IP over Ethernet over BLE" for communicating with the watch

app/build.gradle.kts

@@ -12,6 +12,16 @@ android {
         targetSdk = 33
         versionCode = 29
         versionName = "0.29"
+        ndk.abiFilters.clear()
+        ndk.abiFilters.add("arm64-v8a")
+        ndk.abiFilters.add("armeabi-v7a")
+        ndk.abiFilters.add("x86")
+        ndk.abiFilters.add("x86_64")
+        externalNativeBuild {
+            cmake {
+                cppFlags += ""
+            }
+        }
     }
     buildTypes {
         named("release") {
@@ -31,6 +41,9 @@ android {
                 srcDir("src/main/lib/material-intro-screen/material-intro-screen/src/main/res/")
                 srcDir("src/main/lib/powerampapi/poweramp_api_lib/res/")
             }
+            jniLibs {
+                srcDir("src/main/cpp/lib")
+            }
         }
     }
 
@@ -43,6 +56,12 @@ android {
         disable += "MissingTranslation"
     }
     namespace = "org.asteroidos.sync"
+    externalNativeBuild {
+        cmake {
+            path = file("src/main/cpp/CMakeLists.txt")
+            version = "3.22.1"
+        }
+    }
 }
 
 repositories {

app/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,43 @@
+
+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html.
+# For more examples on how to use CMake, see https://github.com/android/ndk-samples.
+
+# Sets the minimum CMake version required for this project.
+cmake_minimum_required(VERSION 3.22.1)
+
+# Declares the project name. The project name can be accessed via ${ PROJECT_NAME},
+# Since this is the top level CMakeLists.txt, the project name is also accessible
+# with ${CMAKE_PROJECT_NAME} (both CMake variables are in-sync within the top level
+# build script scope).
+project("sync")
+
+add_subdirectory(libslirp)
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+#
+# In this top level CMakeLists.txt, ${CMAKE_PROJECT_NAME} is used to define
+# the target library name; in the sub-module's CMakeLists.txt, ${PROJECT_NAME}
+# is preferred for the same purpose.
+#
+# In order to load a library into your app from Java/Kotlin, you must call
+# System.loadLibrary() and pass the name of the library defined here;
+# for GameActivity/NativeActivity derived applications, the same library name must be
+# used in the AndroidManifest.xml file.
+add_library(${CMAKE_PROJECT_NAME} SHARED
+    # List C/C++ source files with relative paths to this CMakeLists.txt.
+    sync.cpp)
+
+# Specifies libraries CMake should link to your target library. You
+# can link libraries from various origins, such as libraries defined in this
+# build script, prebuilt third-party libraries, or Android system libraries.
+target_link_libraries(${CMAKE_PROJECT_NAME}
+    slirp
+    android
+    log)
+
+target_compile_options(${CMAKE_PROJECT_NAME} PRIVATE
+    -fvisibility=hidden)

app/src/main/cpp/libslirp/.clang-format

@@ -0,0 +1,58 @@
+# https://clang.llvm.org/docs/ClangFormat.html
+# https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+---
+Language:        Cpp
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false # although we like it, it creates churn
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlinesLeft: true
+AlignOperands:   true
+AlignTrailingComments: false # churn
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterReturnType: None # AlwaysBreakAfterDefinitionReturnType is taken into account
+AlwaysBreakBeforeMultilineStrings: false
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterControlStatement: false
+  AfterEnum:       false
+  AfterFunction:   true
+  AfterStruct:     false
+  AfterUnion:      false
+  BeforeElse:      false
+  IndentBraces:    false
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: false
+BreakStringLiterals: true
+ColumnLimit:     80
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: false
+DerivePointerAlignment: false
+DisableFormat:   false
+IndentCaseLabels: false
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: '.*_BEGIN$' # only PREC_BEGIN ?
+MacroBlockEnd:   '.*_END$'
+MaxEmptyLinesToKeep: 2
+PointerAlignment: Right
+ReflowComments:  true
+SortIncludes:    false
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInContainerLiterals: true
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard:        Auto
+UseTab:          Never
+...

app/src/main/cpp/libslirp/.gitignore

@@ -0,0 +1,11 @@
+*.[aod]
+*.gcda
+*.gcno
+*.gcov
+*.lib
+*.obj
+/build/
+/TAGS
+/cscope*
+/src/libslirp-version.h
+/tags

app/src/main/cpp/libslirp/.gitlab-ci.yml

@@ -0,0 +1,110 @@
+image: fedora:latest
+
+variables:
+  DEPS: meson ninja-build
+        gcc libasan liblsan libubsan pkg-config glib2-devel
+        mingw64-gcc mingw64-pkg-config mingw64-glib2
+        clang-analyzer git-core
+
+before_script:
+  - dnf install -y $DEPS
+  - git fetch --tags https://gitlab.freedesktop.org/slirp/libslirp.git
+  - git describe
+
+build:
+  script:
+    - meson --werror build || (cat build/meson-logs/meson-log.txt && exit 1)
+    - ninja -C build
+    - (cd build && meson test) || (cat build/meson-logs/testlog.txt && exit 1)
+    - ninja -C build scan-build
+
+build-asan:
+  script:
+    - CFLAGS=-fsanitize=address meson --werror build || (cat build/meson-logs/meson-log.txt && exit 1)
+    - ninja -C build
+    - (cd build && ASAN_OPTIONS=detect_leaks=0 meson test) || (cat build/meson-logs/testlog.txt && exit 1)
+
+build-lsan:
+  script:
+    - CFLAGS=-fsanitize=leak meson --werror build || (cat build/meson-logs/meson-log.txt && exit 1)
+    - ninja -C build
+    - (cd build && meson test) || (cat build/meson-logs/testlog.txt && exit 1)
+
+build-usan:
+  script:
+    - CFLAGS=-fsanitize=undefined meson --werror build || (cat build/meson-logs/meson-log.txt && exit 1)
+    - ninja -C build
+    - (cd build && meson test) || (cat build/meson-logs/testlog.txt && exit 1)
+
+fuzz:
+  parallel:
+    matrix:
+      - TARGET: [arp, ip-header, udp, udp-h, tftp, dhcp, icmp, tcp, tcp-h, ndp, ip6-header, udp6, udp6-h, tftp6, icmp6, tcp6, tcp6-h]
+  script:
+    - CC=clang CXX=clang++ meson build -Dllvm-fuzz=true || (cat build/meson-logs/meson-log.txt && exit 1)
+    - ninja -C build
+    - build/fuzzing/fuzz-$TARGET -seed=1234 -runs=1000000 fuzzing/IN_$TARGET
+  artifacts:
+    when: on_failure
+    paths:
+      - crash-*
+      - leak-*
+      - oom-*
+      - timeout-*
+
+build-mingw64:
+  script:
+    - (mkdir buildw && cd buildw && mingw64-meson --werror) || (cat buildw/meson-logs/meson-log.txt && exit 1)
+    - ninja -C buildw
+
+Coverity:
+  only:
+    refs:
+      - master
+      - coverity
+  script:
+  - dnf update -y
+  - dnf install -y curl clang
+  - curl -o /tmp/cov-analysis-linux64.tgz https://scan.coverity.com/download/linux64
+    --form project=$COVERITY_SCAN_PROJECT_NAME --form token=$COVERITY_SCAN_TOKEN
+  - tar xfz /tmp/cov-analysis-linux64.tgz
+  - CC=clang meson build
+  - cov-analysis-linux64-*/bin/cov-build --dir cov-int ninja -C build
+  - tar cfz cov-int.tar.gz cov-int
+  - curl https://scan.coverity.com/builds?project=$COVERITY_SCAN_PROJECT_NAME
+    --form token=$COVERITY_SCAN_TOKEN --form email=$GITLAB_USER_EMAIL
+    --form [email protected] --form version="`git describe --tags`"
+    --form description="`git describe --tags` / $CI_COMMIT_TITLE / $CI_COMMIT_REF_NAME:$CI_PIPELINE_ID "
+
+integration-slirp4netns:
+  variables:
+    SLIRP4NETNS_VERSION: "v1.1.12"
+    # Consumed by `make benchmark`
+    BENCHMARK_IPERF3_DURATION: "10"
+  script:
+  # Install libslirp
+  - meson build
+  - ninja -C build install
+  # Register the path of libslirp.so.0
+  - echo /usr/local/lib64 >/etc/ld.so.conf.d/libslirp.conf
+  - ldconfig
+  # Install the dependencies of slirp4netns and its test suite
+  # TODO: install udhcpc for `slirp4netns/tests/test-slirp4netns-dhcp.sh` (currently skipped, due to lack of udhcpc)
+  - dnf install -y autoconf automake findutils iperf3 iproute iputils jq libcap-devel libseccomp-devel nmap-ncat util-linux
+  # Check whether the runner environment is configured correctly
+  - unshare -rn true || (echo Make sure you have relaxed seccomp and appamor && exit 1)
+  - unshare -rn ip tap add tap0 mode tap || (echo Make sure you have /dev/net/tun && exit 1)
+  # Install slirp4netns
+  - git clone https://github.com/rootless-containers/slirp4netns -b "${SLIRP4NETNS_VERSION}"
+  - cd slirp4netns
+  - ./autogen.sh
+  - ./configure
+  - make
+  - make install
+  - slirp4netns --version
+  # Run slirp4netns integration test
+  - make distcheck || (cat $(find . -name 'test-suite.log' ) && exit 1)
+  # Run benchmark test to ensure that libslirp can actually handle packets, with several MTU configurations
+  - make benchmark MTU=1500
+  - make benchmark MTU=512
+  - make benchmark MTU=65520

app/src/main/cpp/libslirp/.gitpublish

@@ -0,0 +1,3 @@
+[gitpublishprofile "default"]
+base = master
+to = [email protected]