C ++无粘结剂addService（）

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问题描述

是否可以使用C ++ API粘结剂两个非特权进程间通信？

所有的例子，我发现（如 https://github.com/mcr/Android-HelloWorldService）依靠通过注册服务 ServiceManager-＆GT; addService（）非根深蒂固的电话上执行时会抛出以下错误：

  E /的ServiceManager：add_service（'my.test.service'，0x48）的uid = 2000  - 权限被拒绝

解决方案

在文件框架/本地/命令/的ServiceManager / service_manager.c的

AOSP（Android开源项目）内
你可以找到下面的方法：

  INT svc_can_register（将uid_t UID，常量uint16_t *名）
{
    为size_t N;    如果（（UID == 0）||（UID == AID_SYSTEM））
        返回1;    为（N = 0; N＆LT;的sizeof（允许）/ sizeof的（允许[0]）; N ++）
        如果（允许（UID == [n]的.uid）及＆放大器; str16eq（姓名，允许[n]的。名称））
            返回1;    返回0;
}

和略高于：

  / * TODO：
 *这些应该来自一个配置文件或者是
 *基于某种形式的一些命名空间规则（媒体
 * UID可以注册媒体。*等）
 * /
静态结构{
    将uid_t UID;
    为const char *名称;
}允许[] = {
    {AID_MEDIA，media.audio_flinger}，
    {AID_MEDIA，media.log}，
    {AID_MEDIA，media.player}，
    {AID_MEDIA，media.camera}，
    {AID_MEDIA，media.audio_policy}，
    {AID_DRM，drm.drmManager}，
    {AID_NFC，NFC}，
    {AID_BLUETOOTH，蓝牙}，
    {AID_RADIO，radio.phone}，
    {AID_RADIO，radio.sms}，
    {AID_RADIO，radio.phonesubinfo}，
    {AID_RADIO，radio.simphonebook}，
/ * TODO：删除电话服务更新后：* /
    {AID_RADIO，手机}，
    {AID_RADIO，SIP}，
    {AID_RADIO，主义}，
    {AID_RADIO，iphonesubinfo}，
    {AID_RADIO，simphonebook}，
    {AID_MEDIA，common_time.clock}，
    {AID_MEDIA，common_time.config}，
    {AID_KEYSTORE，android.security.keystore}，
};

和进一步下跌：

 如果（！svc_can_register（UID，S））{
    ALOGE（add_service（'％s'的，％x）的UID =％d个 - 许可被拒绝\\ n
         STR8（S），拉手，UID）;
    返回-1;
}

结论：/系统/ bin中的二进制系统/的ServiceManager不允许它。（出于安全原因）
可能的解决方案：

杀死和重用PID和服务的名称列出

重新编译自己的ServiceManager二进制和使用这一个

注入你code在这个二元，让大家

修改PID的ServiceManager读取（改的ioctl响应的ServiceManager在binder.h得到（同一目录））

或只是开始你的二进制具有root权限的服务器。客户端可以连接没有根，但服务器需要它。

Is it possible to use C++ Binder API to communicate between two non-privileged processes?

All examples I found (e.g. https://github.com/mcr/Android-HelloWorldService) rely on registering service via ServiceManager->addService() which throws following error when executing on a non-rooted phone:

E/ServiceManager﹕ add_service('my.test.service',0x48) uid=2000 - PERMISSION DENIED

解决方案

Inside the AOSP (Android Open Source Project) in the file frameworks/native/cmds/servicemanager/service_manager.cyou can find the following method:

int svc_can_register(uid_t uid, const uint16_t *name)
{
    size_t n;

    if ((uid == 0) || (uid == AID_SYSTEM))
        return 1;

    for (n = 0; n < sizeof(allowed) / sizeof(allowed[0]); n++)
        if ((uid == allowed[n].uid) && str16eq(name, allowed[n].name))
            return 1;

    return 0;
}

and a bit above:

/* TODO:
 * These should come from a config file or perhaps be
 * based on some namespace rules of some sort (media
 * uid can register media.*, etc)
 */
static struct {
    uid_t uid;
    const char *name;
} allowed[] = {
    { AID_MEDIA, "media.audio_flinger" },
    { AID_MEDIA, "media.log" },
    { AID_MEDIA, "media.player" },
    { AID_MEDIA, "media.camera" },
    { AID_MEDIA, "media.audio_policy" },
    { AID_DRM,   "drm.drmManager" },
    { AID_NFC,   "nfc" },
    { AID_BLUETOOTH, "bluetooth" },
    { AID_RADIO, "radio.phone" },
    { AID_RADIO, "radio.sms" },
    { AID_RADIO, "radio.phonesubinfo" },
    { AID_RADIO, "radio.simphonebook" },
/* TODO: remove after phone services are updated: */
    { AID_RADIO, "phone" },
    { AID_RADIO, "sip" },
    { AID_RADIO, "isms" },
    { AID_RADIO, "iphonesubinfo" },
    { AID_RADIO, "simphonebook" },
    { AID_MEDIA, "common_time.clock" },
    { AID_MEDIA, "common_time.config" },
    { AID_KEYSTORE, "android.security.keystore" },
};

and further down:

if (!svc_can_register(uid, s)) {
    ALOGE("add_service('%s',%x) uid=%d - PERMISSION DENIED\n",
         str8(s), handle, uid);
    return -1;
}

Conclusion: the system binary in /system/bin/servicemanager doesn't allow it. (for security reasons)Possible solutions:

kill and reuse PID and name of service listed
recompile your own servicemanager binary and use this one
inject your code in this binary, to allow everyone
change the PID servicemanager reads (change the ioctl response servicemanager gets in binder.h (same directory))
or just start your server in a binary having root permissions. Clients can connect without root, but the server needs it.

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