Android中如何自己制作su

在Android源码的system\extras(比如Android4.0\system\extras)下新建一个目录,比如su_robin目录

在su_robin目录下包含以三个文件:
su.h文件
 
   

#ifndef SU_h 
#define SU_h 1
#ifdef LOG_TAG
#undef LOG_TAG
#endif
#define LOG_TAG "robin"
#define REQUESTOR "com.noshufou.android.su"
#define REQUESTOR_DATA_PATH "/data/data/" REQUESTOR
#define REQUESTOR_CACHE_PATH "/dev/" REQUESTOR
#define REQUESTOR_DATABASES_PATH REQUESTOR_DATA_PATH "/databases"
#define REQUESTOR_DATABASE_PATH REQUESTOR_DATABASES_PATH "/permissions.sqlite"
/* intent actions */
#define ACTION_REQUEST REQUESTOR ".REQUEST"
#define ACTION_RESULT  REQUESTOR ".RESULT"
#define DEFAULT_SHELL "/system/bin/sh"
#ifdef SU_LEGACY_BUILD
#define VERSION_EXTRA "l"
#else
#define VERSION_EXTRA ""
#endif
#define VERSION "3.1.1" VERSION_EXTRA
#define VERSION_CODE 17
#define DATABASE_VERSION 6
#define PROTO_VERSION 0
struct su_initiator {
    pid_t pid ;
    unsigned uid ;
    char bin [ PATH_MAX ];
    char args [ 4096 ];
};
struct su_request {
    unsigned uid ;
    int login ;
    int keepenv ;
    char * shell ;
    char * command ;
    char ** argv ;
    int argc ;
    int optind ;
};
struct su_context {
    struct su_initiator from ;
    struct su_request to ;
    mode_t umask ;
};
enum {
    DB_INTERACTIVE ,
    DB_DENY ,
    DB_ALLOW
};
#endif

注意,这里的很多东西是多余。
su.c文件
 
    

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "su.h"
int main ( int argc , char * argv [])
{
LOGI ( "hello !robin-su begin %d !" , getuid ());
printf ( "hello !robin-su begin" );
int uid = 0 ;
int gid = 0 ;
if ( setgid ( gid ) || setuid ( uid )) {
LOGI ( "robin su: permission denied\n" );
fprintf ( stderr , "su: permission denied\n" );
return 1 ;
}
  char command [ 1024 ];
LOGI("hello !robin-su end %d !",getuid());
printf ( "hello !robin-su end" );
/* Default exec shell. */
   execlp ( "/system/bin/sh" , "sh" , NULL );
   fprintf ( stderr , "su: exec failed\n" );
return 1 ;
}

Android.mk文件
 
   

LOCAL_PATH := $ ( call my - dir )
include $ ( CLEAR_VARS )
LOCAL_MODULE := sur
LOCAL_SRC_FILES := su . c
LOCAL_STATIC_LIBRARIES := \
    liblog \
    libc \
LOCAL_MODULE_PATH := $ ( TARGET_OUT_OPTIONAL_EXECUTABLES )
LOCAL_MODULE_TAGS := eng debug
LOCAL_FORCE_STATIC_EXECUTABLE := true
include $ ( BUILD_EXECUTABLE )

编译Android源码,生成rom
如果你还不知道如何编译Android源码,请参照
http://source.android.com/source/building-running.html
在out\target\product\generic\system\xbin目录下找到生成的可执行文件 sur,就是我们自己制作的su文件
通过adb push命令将其推送到手机上的 system\xbin目录,
通过执行系统原来自己带的su切换到root用户,对手机上sur文件执行 chmod  6 777 sur命令。 
使文件属性变为 rwsrwsrwx,如下所示
rw s rwsrwx root     root        58960 2013-08-29 11:31  sur
然后你可以 通过执行系统原来自己带的sur切换到root用户
关于 chmod  6 777 sur 命令请参考《 chmod命令基本篇 》和 请参考《 chmod命令高级篇( SetUID与SetGID标识位)
关于 setuid 请参考《 setuid()与setgid()的使用 
结束!


原文地址:http://hubingforever.blog.163.com/blog/static/171040579201372915716149/

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