Android中如何自己制作su

浏览数：24 / 时间：2015年06月11日

本文原博客：http://hubingforever.blog.163.com/blog/static/171040579201372915716149/

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 <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <sys/select.h>
#include <sys/time.h>
#include <unistd.h>
#include <limits.h>
#include <fcntl.h>
#include <errno.h>
#include <endian.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <stdint.h>
#include <pwd.h>

#include <private/android_filesystem_config.h>
#include <cutils/properties.h>
#include <cutils/log.h>

#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)