initial commit

.gitignore

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+*.iml
+.gradle
+/local.properties
+.idea
+/.idea/caches/build_file_checksums.ser
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+.DS_Store
+/build
+/captures
+/release
+.externalNativeBuild
+elf-cleaner.sh

README.md

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+# Riru
+
+Riru is a very simple thing. It provides ability to modules to run their code in apps' or system server's process.
+
+## Requirements
+
+* Rooted Android 6.0+ devices 
+* Magisk (use to replace system file, temporarily only provide Magisk zip)
+
+## How it work?
+
+In short, replace a shared library which will loaded by zygote process.
+
+First we need to find that library. The library needs to be as simple as possible, so we found libmemtrack, with only 10 exported functions. Then we can provide a library named libmemtrack with all its functions, so the functionality will not be affected and we will able to in the zygote process.
+
+Now the next question, how to know if we are in a app process or a system server process. We found some JNI functions (`com.android.internal.os.Zygote#nativeForkAndSpecialize` & `com.android.internal.os.Zygote#nativeForkSystemServer`) will be called when a app or system server is forked. So we just need to replace these functions to ours. This part is violent, just search method name in memory. At the end, `JNINativeMethod` of these methods can be found, then we can call RegisterNatives again to replace them.
+
+## Why Riru is made?
+
+There is only one `libmemtrack.so`, if someone wants do something by replace it, others can't. So I made Riru to occupy libmemtrack, but provide ability to make modules.
+
+## Build Requirements
+
+1. Android NDK (add directory with `ndk-build` to `PATH`)
+2. `zip` to create zip file (add to `PATH`)
+3. (Windows only) Envirment to run `build.sh` script
+
+## Build core
+
+Run `gradlew :riru-core:zip` in command line or Android Studio, zip will be saved to `release`
+
+## Build your own module
+
+1. Copy `riru-module-template` and rename to your name
+2. Change module name in `riru-your-module/build.sh` `riru-your-module/template_override/module.prop` `riru-your-module/template_override/riru_module.prop` `riru-your-module/jni/main/Android.mk`
+3. Write your code
+4. Run `:riru-your-module:zip` task in command line or Android Studio, zip will be saved to `release`
+
+## Install
+
+Current only support Magisk.
+
+1. Install core zip in Magisk
+2. Install module zip in Magisk

build.gradle

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+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.2.0-beta05'
+
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
+
+ext {
+    minSdkVersion = 23
+    targetSdkVersion = 28
+}

build.sh

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+#!/bin/bash
+MODULE_NAME=$1
+if [ "$MODULE_NAME" == "" ]; then
+  echo "Usage: sh build.sh <module name> [<version name>]"
+  exit 1
+fi
+
+if [ ! -d "$MODULE_NAME" ]; then
+  echo "$MODULE_NAME not exists"
+  exit 1
+fi
+
+VERSION=$2
+[[ "$VERSION" == "" ]] && VERSION=v1
+
+LIBS_OUTPUT=$MODULE_NAME/build/ndkBuild/libs
+NDK_OUT=$MODULE_NAME/build/ndkBuild/obj
+
+# build
+NDK_BUILD=ndk-build
+[[ "$OSTYPE" == "msys" ]] && NDK_BUILD=ndk-build.cmd
+
+(cd $MODULE_NAME; $NDK_BUILD NDK_LIBS_OUT=build/ndkBuild/libs NDK_OUT=build/ndkBuild/obj)
+
+# elf cleaner
+function run_elf_cleaner {
+  for file in $1/*
+  do
+    if [ -f $file ]; then
+        clean_elf $file > /dev/null
+    fi
+  done
+}
+
+if [ -f elf-cleaner.sh ]; then
+  source elf-cleaner.sh
+  run_elf_cleaner $LIBS_OUTPUT/arm64-v8a
+  run_elf_cleaner $LIBS_OUTPUT/armeabi-v7a
+fi
+
+# create tmp dir
+TMP_DIR=build/zip
+TMP_DIR_MAGISK=$TMP_DIR/magisk
+
+rm -rf $TMP_DIR
+mkdir -p $TMP_DIR
+
+cp -a template/magisk/. $TMP_DIR_MAGISK
+
+# copy files
+mkdir -p $TMP_DIR_MAGISK/system/lib64
+mkdir -p $TMP_DIR_MAGISK/system/lib
+cp -a $LIBS_OUTPUT/arm64-v8a/. $TMP_DIR_MAGISK/system/lib64
+cp -a $LIBS_OUTPUT/armeabi-v7a/. $TMP_DIR_MAGISK/system/lib
+
+# run custom script
+if [ -f $MODULE_NAME/build.sh ]; then
+  source $MODULE_NAME/build.sh
+  copy_files
+fi
+
+# zip
+mkdir -p release
+ZIP_NAME=magisk-$MODULE_NAME-arm-"$VERSION".zip
+rm -f release/$ZIP_NAME
+rm -f $TMP_DIR_MAGISK/$ZIP_NAME
+(cd $TMP_DIR_MAGISK; zip -r $ZIP_NAME * > /dev/null)
+mv $TMP_DIR_MAGISK/$ZIP_NAME release/$ZIP_NAME
+
+# clean tmp dir
+rm -rf $TMP_DIR

gradle.properties

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+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx1536m
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true

gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

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+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"