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

app/build.gradle.kts

@@ -14,9 +14,6 @@ android {
         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 += ""
@@ -42,7 +39,7 @@ android {
                 srcDir("src/main/lib/powerampapi/poweramp_api_lib/res/")
             }
             jniLibs {
-                srcDir("src/main/cpp/lib")
+                srcDir("/work/android-root/lib")
             }
         }
     }
@@ -82,4 +79,5 @@ dependencies {
     implementation("org.osmdroid:osmdroid-android:6.1.16")
     implementation("no.nordicsemi.android.support.v18:scanner:1.6.0")
     implementation("no.nordicsemi.android:ble:2.7.2")
+    implementation("com.google.guava:guava:33.1.0-android")
 }

app/src/main/cpp/CMakeLists.txt

@@ -14,6 +14,17 @@ project("sync")
 
 add_subdirectory(libslirp)
 
+find_program(BASH bash)
+
+set(ENV{ANDROID_NDK_HOME} ${CMAKE_ANDROID_NDK})
+set(ENV{ABI} ${CMAKE_ANDROID_ARCH_ABI})
+execute_process(COMMAND ${BASH} ${CMAKE_CURRENT_SOURCE_DIR}/build_depends.sh)
+
+link_directories(/tmp/android-root/lib/${CMAKE_ANDROID_ARCH_ABI})
+include_directories(/tmp/android-root/include)
+
+set(ENV{PKG_CONFIG_PATH} /tmp/android-root/lib/${CMAKE_ANDROID_ARCH_ABI}/pkgconfig)
+
 # 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.

app/src/main/cpp/build_depends.sh

@@ -0,0 +1,133 @@
+#!/usr/bin/env bash
+#
+# AsteroidOSSync
+# Copyright (c) 2024 AsteroidOS
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+set -Eeo pipefail
+ANDROID_NDK_HOME=${ANDROID_NDK_HOME:?please supply a valid \$ANDROID_SDK_HOME}
+ABI=${ABI:?please supply a valid android \$ABI}
+case "${ABI}" in
+  arm64-v8a)
+    LINUX_ABI=aarch64
+    ;;
+  armeabi-v7a)
+    LINUX_ABI=arm
+    ;;
+  x86_64)
+    LINUX_ABI=x86_64
+    ;;
+  x86)
+    LINUX_ABI=i686-pc
+    ;;
+  *)
+    exit 1
+    ;;
+esac
+SYSROOT=${ANDROID_NDK_HOME}/toolchains/llvm/prebuilt/linux-x86_64/sysroot
+
+>&2 echo "Android NDK in ${ANDROID_NDK_HOME}"
+export PATH=$PATH:${ANDROID_NDK_HOME}/toolchains/llvm/prebuilt/linux-x86_64/bin
+
+PREFIX=${PREFIX:-/tmp/android-root/}
+
+GLIB_VERSION=${GLIB_VERSION:-2.80.0}
+GLIB_URL=https://download.gnome.org/sources/glib/${GLIB_VERSION%.*}/glib-${GLIB_VERSION}.tar.xz
+GLIB_CACHE=${XDG_CACHE_DIR:-/tmp}/glib-${GLIB_VERSION}.tar.xz
+
+LIBICONV_VERSION=${LIBICONV_VERSION:-1.17}
+LIBICONV_URL=https://ftp.gnu.org/pub/gnu/libiconv/libiconv-${LIBICONV_VERSION}.tar.gz
+LIBICONV_CACHE=${XDG_CACHE_DIR:-/tmp}/libiconv-${LIBICONV_VERSION}.tar.gz
+export CFLAGS=--sysroot="${SYSROOT}"
+export CPPFLAGS=--sysroot="${SYSROOT}"
+export CC=${LINUX_ABI}-linux-android21-clang
+export CXX=${LINUX_ABI}-linux-android21-clang++
+export AR=llvm-ar
+export RANLIB=llvm-ranlib
+
+pushd "$(mktemp -d)"
+
+  [[ ! -f "${LIBICONV_CACHE}" ]] \
+    && wget -O "${LIBICONV_CACHE}" "${LIBICONV_URL}"
+  bsdtar --strip-components=1 -xf "${LIBICONV_CACHE}"
+
+  mkdir -p build
+  pushd build
+
+  ../configure --host=${LINUX_ABI}-linux-android --with-sysroot="${SYSROOT}" --prefix="${PREFIX}" --libdir="${PREFIX}/lib/${ABI}"
+  make -j14
+  make install
+
+  popd # build
+
+popd
+
+pushd "$(mktemp -d)"
+
+  [[ ! -f "${GLIB_CACHE}" ]] \
+    && wget -O "${GLIB_CACHE}" "${GLIB_URL}"
+  bsdtar --strip-components=1 -xf "${GLIB_CACHE}"
+
+  >&2 echo "Will build GLib"
+
+  _CROSS_FILE=$(mktemp)
+  >&2 echo "Will setup cross"
+  cat <<EOF. >"${_CROSS_FILE}"
+[built-in options]
+c_args = ['-I${PREFIX}/include']
+c_link_args = ['-L${PREFIX}/lib/${ABI}']
+
+[constants]
+arch = '${LINUX_ABI}-linux-android'
+
+[binaries]
+ar = 'llvm-ar'
+c = '${LINUX_ABI}-linux-android21-clang'
+as = [c]
+cpp = '${LINUX_ABI}-linux-android21-clang++'
+ranlib = 'llvm-ranlib'
+strip = 'llvm-strip'
+pkgconfig = '/usr/bin/pkg-config'
+cmake = '/usr/bin/cmake'
+
+[properties]
+sys_root = '${ANDROID_NDK_HOME}/toolchains/llvm/prebuilt/linux-x86_64/sysroot'
+pkg_config_libdir = '${PREFIX}/lib/${ABI}/pkgconfig'
+
+[host_machine]
+system = 'android'
+cpu_family = '${LINUX_ABI}'
+cpu = '${LINUX_ABI}'
+endian = 'little'
+EOF.
+
+  patch <<EOF. ||:
+--- meson.build        2024-03-07 22:35:05.000000000 +0100
++++ meson.build        2024-04-27 11:44:38.569868768 +0200
+@@ -2170 +2170 @@
+-  libiconv = dependency('iconv')
++  libiconv = [cc.find_library('iconv', required : true, dirs : ['/work/android-root/lib'])]
+EOF.
+
+
+  >&2 echo "Will configure in ${PWD}/_builddir/"
+  >&2 meson setup ./_builddir/ ./ --cross-file="${_CROSS_FILE}" --prefix="${PREFIX}" --libdir="lib/${ABI}"
+  >&2 echo "Will build"
+  >&2 ninja -C ./_builddir/
+  >&2 echo "Will install"
+  >&2 ninja -C ./_builddir/ install
+  >&2 echo "All depends ready"
+
+popd

app/src/main/cpp/sync.cpp

@@ -1,5 +1,6 @@
 #include <jni.h>
 #include <stdlib.h>
+//#include <arpa/inet.h>
 
 #include "libslirp/src/libvdeslirp.h"
 
@@ -46,14 +47,14 @@ JNIEXPORT void JNICALL Java_org_asteroidos_sync_connectivity_SlirpService_finali
     env->SetLongField(thisObject, fid, 0L);
 }
 
-JNIEXPORT long JNICALL Java_org_asteroidos_sync_connectivity_SlirpService_vdeRecv
+JNIEXPORT jlong JNICALL Java_org_asteroidos_sync_connectivity_SlirpService_vdeRecv
         (JNIEnv* env, jobject thisObject, jobject dbb, jlong offset, jlong count) {
 
     void *buf = reinterpret_cast<char *>(env->GetDirectBufferAddress(dbb)) + offset;
     return vdeslirp_recv(GET_MYSLIRP(env, thisObject), buf, count);
 }
 
-JNIEXPORT long JNICALL Java_org_asteroidos_sync_connectivity_SlirpService_vdeSend
+JNIEXPORT jlong JNICALL Java_org_asteroidos_sync_connectivity_SlirpService_vdeSend
         (JNIEnv* env, jobject thisObject, jobject dbb, jlong offset, jlong count) {
 
     void *buf = reinterpret_cast<char *>(env->GetDirectBufferAddress(dbb)) + offset;
@@ -75,4 +76,31 @@ JNIEXPORT jobject JNICALL Java_org_asteroidos_sync_connectivity_SlirpService_get
     return ret;
 }
 
+JNIEXPORT jint JNICALL Java_org_asteroidos_sync_connectivity_SlirpService_vdeAddUnixFwd
+        (JNIEnv* env, jobject thisObject, jstring path, jstring ip, jint port) {
+    const char *c_path = env->GetStringUTFChars(path, nullptr);
+    const char *c_ip = env->GetStringUTFChars(ip, nullptr);
+
+    struct in_addr addr{ inet_addr(c_ip) };
+    int rv = vdeslirp_add_unixfwd(GET_MYSLIRP(env, thisObject), const_cast<char *>(c_path), &addr, port);
+
+    env->ReleaseStringUTFChars(path, c_path);
+    env->ReleaseStringUTFChars(ip, c_ip);
+
+    return rv;
+}
+
+JNIEXPORT jint JNICALL Java_org_asteroidos_sync_connectivity_SlirpService_vdeAddFwd
+        (JNIEnv* env, jobject thisObject, jboolean udp, jstring hostip, jint hostport, jstring ip, jint port) {
+    const char *c_hostip = env->GetStringUTFChars(hostip, nullptr);
+    const char *c_ip = env->GetStringUTFChars(ip, nullptr);
+
+    int rv = vdeslirp_add_fwd(GET_MYSLIRP(env, thisObject), udp, (struct in_addr){inet_addr(c_hostip) }, hostport, (struct in_addr){inet_addr(c_ip) }, port);
+
+    env->ReleaseStringUTFChars(hostip, c_hostip);
+    env->ReleaseStringUTFChars(ip, c_ip);
+
+    return rv;
+}
+
 }