android 添加 adb root 67754400 命令获取root权限

      上次添加adb reboot factory 的代码看懂还不是很难，结果今天师傅让我把这个命令加到另一款手机里面，加是加进去了，功能也有了，但几乎没怎么看懂....从来没了解过MK文件的原理和语法，不过还是记录下来，赶快奋斗吧~~骚年~

PS：这个功能的修改方法应该还有很大的发展空间，因为修改过后进入shell，虽然可以获取root权限，但adb root disable命令也就变得没有用了，权限回不去，不过貌似基本没人会把权限改回去。。。就看什么时候我能看懂再优化成可进可退的了~~

 （1）build/corn/main.mk文件修改:

  ifeq(true,$(strip$(enable_target_debugging)))

................................

else # ！enable_target_debugging

        ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable = 0改为

        ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable = 1

     再添加：

      # Include the debugging/testing OTA keys in this build.

     INCLUDE_TEST_OTA_KEYS :=true

(2) dediatek/config/x160v/ProjectConfig.mk文件修改：

    MTK_USER_ROOT_SWITCH = no改为

    MTK_USER_ROOT_SWITCH = yes

(3)system/core/adb/Android.mk文件修改：

ifneq(,$filter userdebug eng user , $(TARGET_BUILD_VARIANT)))

................

LOCAL_CFLAGS += -DSECRETCODE = \"67754400\"

(4)system/core/adb/services.c文件修改：

void restart_root_service(int fd ,void *cookie)函数内添加：

         char *p_magic = (char *)cookie;

         char magic[100];

         if(getuid() == 0){

             if((strncmp(p_magic,"disable",7) == 0)||(strncmp(p_magic,"d",1) == 0)){

                 property_set("service.adb.root","0");

                 snprintf(buf,sizeof(buf),"adbd is already running as shell\n");

                 writex(fd,buf,strlen(buf));

                 adb_close(fd);

                 return;

                 }

                 else{

                 snprintf(buf,sizeof(buf),"adbd is already running as root \n");

                 writex(fd,buf,strlen(buf));

                 adb_close(fd);

                 }

                 return;

           }else...........

..............................

           property_set("service.adb.root","1");

           snprintf(buf,sizeof(buf),"restarting adbd as root\n");

           writex(fd,buf,strlen(buf));

           adb_close(fd);

            sprintf(magic,"%s",SECRETCODE);

            if((strlen(p_magic) == 8)&&(strncmp(magic,p_magic,8) == 0)){

                     property_set("service.adb.root","1");

                     snprintf(buf,sizeof(buf),"restarting adbd as root ~~\n");

                     writex(fd,buf,strlen(buf));

                      adb_close(fd);

                      return;

               }else{

                      snprintf(buf,sizeof(buf),"adbd can not run as root because of error password\n");

                     writex(fd,buf,strlen(buf));

                      adb_close(fd);

                      return;

                  }

int service_to_fd(const char *name)函数修改

  ret = create_service_thread(restart_root_service,NULL);改为

  ret = create_service_thread(restart_root_service,(void*)(name + 5));