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android 新增native binder service 方式（一）

article 2025/2/28 21:01:06

关于之前说的native service 之前有写过类似的文章，今天主要介绍下如何通过binder 方式跨进程调用和回调,结合网上的各种文章，总结了3种常见的添加方式，供大家参考。

一，aidl 文件定义

先看下整体的目录结构

libserviceaidl 就是我定义的aidi接口

IService.aidl

package com.test;

import com.test.IServiceCallback;

interface IService {
    void registerCallback(IServiceCallback callback);
    void call(int type);
    int  callMcu(int file,in byte[] type); 
}

IServiceCallback.aidl

package com.test;

interface IServiceCallback{
    void onEventString(int eventCode, String eventMessage);
    void onEventbyte(out byte[] data);
}

通过Android.bp 编译成so

cc_library_shared {
    name: "libserviceaidl",

    aidl: {
        export_aidl_headers: true,
        local_include_dirs: ["aidl"],
        include_dirs: [
        ],
    },

    srcs: [
        ":serviceaidl",
    ],

    shared_libs: [
        "libbase",
        "libcutils",
        "libutils",
        "liblog",
        "libbinder",
        "libgui",
    ],


    cflags: [
        "-Werror",
        "-Wall",
        "-Wextra",
    ],
}

filegroup {
    name: "serviceaidl",
    srcs: [
        "aidl/com/test/IService.aidl",
        "aidl/com/test/IServiceCallback.aidl",
    ],
    path: "aidl",
}

make libserviceaidl 

会生成libserviceaidl.so ,需要push 到我们系统对应目录，这样调用的binder 库就定义好了。

二，编译Native service 

Android.bp 添加aidl 库依赖

cc_binary {
    name: "testservverfirst",
    srcs: ["servertest.cpp",
           ],
    shared_libs: [
        "liblog",
        "libcutils",
        "libutils",
        "libbinder",
         "libserviceaidl",// 上面编译生成的
    ],

    init_rc: ["testservver.rc"],
}


cc_binary {
    name: "clienttest",
        srcs: ["clienttest.cpp", 
          ],

    shared_libs: [
        "liblog",
        "libcutils",
        "libutils",
        "libbinder",
         "libserviceaidl",
    ],
}

servertest.cpp 源文件

#define LOG_TAG "testservverfirst"
#include <log/log.h>

#include <unistd.h>
#include <stdlib.h>
#include <utils/RefBase.h>
#include <utils/Log.h>
#include <binder/TextOutput.h>
#include <binder/IInterface.h>
#include <binder/IBinder.h>
#include <binder/ProcessState.h>
#include <binder/IServiceManager.h>
#include <binder/IPCThreadState.h>
#include <termios.h> 
#include <utils/String16.h>
#include <com/test/BnService.h>


using namespace std;
using namespace android;

class TestService : public com::test::BnService
{
    public:

    TestService(){
    }

    binder::Status nativecall(int i) 
    {
        ALOGI("server nativecall function is running %d",i);
        if(mycallback != nullptr){
            mycallback->onEventString(4,String16("callbacksuccuess"));
        }
        
        return binder::Status();
    }

    binder::Status  callMcu(int32_t file,const vector<uint8_t>& type, int32_t* _aidl_return){
        *_aidl_return = 1;
        ALOGI("server callMcu function is running _aidl_return",*_aidl_return);
        return binder::Status();
    }

    binder::Status  call(int32_t type){
        ALOGI("server call function is running call",type);
        return binder::Status();
    }


    // 实现回调注册
    binder::Status registerCallback(const sp<com::test::IServiceCallback>& callback){
        mycallback  = callback;
        return binder::Status();
    }

    private:
        sp<::com::test::IServiceCallback> mycallback;
    
};

int main(int argc, char const *argv[])
{
    ALOGD("Server is runing");
    //发布服务
    defaultServiceManager()->addService(String16("TestService"), new TestService());
    ProcessState::self()->startThreadPool();
    IPCThreadState::self()->joinThreadPool();
    
    return 0;
}

编译testservverfirst　，会生成testservverfirst　可执行文件，我们push 到系统/system/bin/ 下

手动执行：./system/bin/testservverfirst 会看到

01-18 17:59:16.174  4144  4144 D testservverfirst: Server is runing

说明我们的native service 运行成功了，也可以通过命令查看：

查看native service 是否运行成功

device:/ # ps -A| grep testservverfirst                                                                                                                                                                  
root           4144   3449   15340   4952 binder_ioctl_write_read 0 S testservverfirst

查看binder service 是否运行成功

130|monaco_go:/ # dumpsys | grep TestService,                                                                                                                                                               
--------- 0.009s was the duration of dumpsys TestService, ending at: 2025-01-18 18:18:52
 

三，编译client 

我们编译一个client 来本地验证下，binder 通信是否成功

make  clienttest

#define LOG_TAG "clienttest"
#include <log/log.h>

#include <stdlib.h>
#include <utils/RefBase.h>
#include <utils/Log.h>
#include <binder/TextOutput.h>
#include <binder/IInterface.h>
#include <binder/IBinder.h>
#include <binder/ProcessState.h>
#include <binder/IServiceManager.h>
#include <binder/IPCThreadState.h>
#include <com/test/BnService.h>


using namespace android;

int main(int argc, char const *argv[])
{
    sp<IServiceManager> sm = defaultServiceManager();
    sp<IBinder> binder = sm->getService(String16("TestService"));
    sp<com::test::IService> simservice = interface_cast<com::test::IService>(binder);
    simservice->call(3);
    return 0;
}


生成的clienttest ,push 到系统system/bin/,手动执行　./system/bin/clienttest,查看service 的log 

01-18 18:00:25.336  4144  4145 I testservverfirst: server call function is running call

说明调用成功了。

四，添加开机启动

这里我们加了一个rc 文件，开机会解析。

testservver.rc

on post-fs
    chown system system /system/bin/testservverfirst
    chmod 0777 /system/bin/testservverfirst
    restorecon_recursive /system/bin/testservverfirst

service testservverfirst /system/bin/testservverfirst
    class core
    console
    disabled
    seclabel u:r:su:s0

on property:sys.xss=2
    setprop xss.home 2
	start testservverfirst  

on property:sys.boot_completed=1
	start testservverfirst

这里我们监听sys.boot_completed 开机完成的属性，来启动服务，还有其他的方式，参考之前写的文章

Android 新增可执行脚本方式总结_android脚本-CSDN博客

五，增加selinux 权限

上面四个步骤，我们走完过后，发现开机服务是启动不了的，因为缺少selinux 权限，这个之前文章也介绍过，这个需要耐心，慢慢添加，大概步骤如下。

主要修改

file_contexts  添加native service 标签

testservverfirst.te　添加native 权限

service.te　添加binder　service 类型

service_contexts　添加binder service 标签

调试的时候记得先关闭selinux 这样方便一次性把权限都加完。



diff --git a/prebuilts/api/30.0/private/testservverfirst.te b/prebuilts/api/30.0/private/testservverfirst.te
new file mode 100644
index 0000000..5a72981
--- /dev/null
+++ b/prebuilts/api/30.0/private/testservverfirst.te
@@ -0,0 +1,15 @@
+type testservverfirst, domain,mlstrustedsubject;
+typeattribute testservverfirst coredomain;
+type testservverfirst_exec, system_file_type, exec_type, file_type;
+binder_use(testservverfirst)
+init_daemon_domain(testservverfirst)
+
+allow testservverfirst servicemanager:binder { call transfer };
+allow testservverfirst testservverfirst_service:service_manager { add find };
+allow testservverfirst tty_device:chr_file { read write };
+allow testservverfirst untrusted_app:binder call;
+
+binder_use(testservverfirst)
+add_service(testservverfirst,testservverfirst_service)
+
+
diff --git a/prebuilts/api/30.0/private/file_contexts b/prebuilts/api/30.0/private/file_contexts
index b774920..37049f6 100644
--- a/prebuilts/api/30.0/private/file_contexts
+++ b/prebuilts/api/30.0/private/file_contexts
@@ -738,3 +738,4 @@
 #############################
 # mount point for read-write product partitions
 /mnt/product(/.*)?          u:object_r:mnt_product_file:s0
+/system/bin/testservverfirst u:object_r:testservverfirst_exec:s0
diff --git a/prebuilts/api/30.0/private/service.te b/prebuilts/api/30.0/private/service.te
index 6c17521..77d585a 100644
--- a/prebuilts/api/30.0/private/service.te
+++ b/prebuilts/api/30.0/private/service.te
@@ -6,3 +6,4 @@
 type statscompanion_service,        system_server_service, service_manager_type;
 type statsmanager_service,          system_api_service, system_server_service, service_manager_type;
 type uce_service,                   service_manager_type;
+type testservverfirst_service,        service_manager_type;
diff --git a/prebuilts/api/30.0/private/service_contexts b/prebuilts/api/30.0/private/service_contexts
index 7c9f396..c1687f7 100644
--- a/prebuilts/api/30.0/private/service_contexts
+++ b/prebuilts/api/30.0/private/service_contexts
@@ -249,3 +249,4 @@
 window                                    u:object_r:window_service:s0
 glasses                                   u:object_r:sim_glasses_service:s0
 *                                         u:object_r:default_android_service:s0
+TestService                            u:object_r:testservverfirst_service:s0
diff --git a/prebuilts/api/30.0/private/untrusted_app.te b/prebuilts/api/30.0/private/untrusted_app.te
index 6e7a99c..97a84e3 100644
--- a/prebuilts/api/30.0/private/untrusted_app.te
+++ b/prebuilts/api/30.0/private/untrusted_app.te
@@ -14,3 +14,5 @@
 untrusted_app_domain(untrusted_app)
 net_domain(untrusted_app)
 bluetooth_domain(untrusted_app)
+allow untrusted_app testservverfirst:binder { transfer call };
+allow untrusted_app testservverfirst_service:service_manager find;
diff --git a/private/testservverfirst.te b/private/testservverfirst.te
new file mode 100644
index 0000000..5a72981
--- /dev/null
+++ b/private/testservverfirst.te
@@ -0,0 +1,15 @@
+type testservverfirst, domain,mlstrustedsubject;
+typeattribute testservverfirst coredomain;
+type testservverfirst_exec, system_file_type, exec_type, file_type;
+binder_use(testservverfirst)
+init_daemon_domain(testservverfirst)
+
+allow testservverfirst servicemanager:binder { call transfer };
+allow testservverfirst testservverfirst_service:service_manager { add find };
+allow testservverfirst tty_device:chr_file { read write };
+allow testservverfirst untrusted_app:binder call;
+
+binder_use(testservverfirst)
+add_service(testservverfirst,testservverfirst_service)
+
+
diff --git a/private/file_contexts b/private/file_contexts
index b774920..37049f6 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -738,3 +738,4 @@
 #############################
 # mount point for read-write product partitions
 /mnt/product(/.*)?          u:object_r:mnt_product_file:s0
+/system/bin/testservverfirst u:object_r:testservverfirst_exec:s0
diff --git a/private/service.te b/private/service.te
index 6c17521..77d585a 100644
--- a/private/service.te
+++ b/private/service.te
@@ -6,3 +6,4 @@
 type statscompanion_service,        system_server_service, service_manager_type;
 type statsmanager_service,          system_api_service, system_server_service, service_manager_type;
 type uce_service,                   service_manager_type;
+type testservverfirst_service,        service_manager_type;
diff --git a/private/service_contexts b/private/service_contexts
index 7c9f396..c1687f7 100755
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -249,3 +249,4 @@
 window                                    u:object_r:window_service:s0
 glasses                                   u:object_r:sim_glasses_service:s0
 *                                         u:object_r:default_android_service:s0
+TestService                            u:object_r:testservverfirst_service:s0
diff --git a/private/untrusted_app.te b/private/untrusted_app.te
index 6e7a99c..97a84e3 100644
--- a/private/untrusted_app.te
+++ b/private/untrusted_app.te
@@ -14,3 +14,5 @@
 untrusted_app_domain(untrusted_app)
 net_domain(untrusted_app)
 bluetooth_domain(untrusted_app)
+allow untrusted_app testservverfirst:binder { transfer call };
+allow untrusted_app testservverfirst_service:service_manager find;


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