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兑现PHP的编译执行分离(separating compilation and execution)

Jun 13, 2016 pm 01:19 PM
array compile execute file zend

实现PHP的编译执行分离(separating compilation and execution)

刚刚在PHP群内和大家聊天,应承了大家要写一个关于如何实现PHP源码加密的文章,借着这会QA在冒烟的机会,就这个问题,我写点思路。
我以前的文章介绍过,ZE(Zend engine)执行一个PHP脚本会经历编译->执行,只不过它每次执行都会去重新编译PHP文件。并没有实现编译和执行分离。
在ZE的编译和执行阶段,有俩个重要的函数:
ZEND_API zend_op_array *(*zend_compile_file)(zend_file_handle *file_handle, int type TSRMLS_DC);

ZEND_API void (*zend_execute)(zend_op_array *op_array TSRMLS_DC);
zend_compile_file负责将要执行的脚本文件编译成由ZE的基本指令序列构成的op codes,然后将op codes交由zend_execute执行,从而得到我们脚本的结果。
所以,我们完全可以通过修改默认的zend_complie_file和zend_execute来实现,PHP的执行和编译分离,进一步,我们还可以再这个基础上实现,对我们脚本的加密和解密。
我们通过一个PHP扩展模块来实现这个功能,首先,我们需要在模块初始化的时候:
PHP_MINIT_FUNCTION(sample)
{
?old_compile_file = zend_compile_file; //保存现场
?old_execute = zend_execute;
?zend_compile_file = my_compile_file; //截获
?zend_execute = my_execute;
?return SUCCESS;
}
在我们的my_compile_file中,判断我们的文件是否是编译过的文件,假设后缀名是*.ze。
static zend_op_array *my_compile_file(zend_file_handle *file_handle, int type TSRMLS_DC)
{
?if(strstr(file_handle->filename, ".ze") != NULL){
?? //是编译过的文件。直接返回文件内容.
?}
?zend_op_array *op_array;
?op_array = old_compile_file (file_handle, type TSRMLS_CC); //调用默认的compile,截获输出
?if(op_array){
?? //保存op_array;
?}
?return op_array;
}
这样,我们就实现了,对已经编译文件的支持,和对文件编译的支持。
然后,需要编写我们的执行函数:
static void my_execute(zend_op_array *op_array TSRMLS_DC)
{
?old_execute(op_array TSRMLS_DC); //简单交由默认执行函数执行。
}
也许你要问为什么要包装以后的执行函数,呵呵,我只是为了说明,一种方式,就是可以截获这个东东而已。有什么用?就看读者你有什么要求能通过这个方式实现了: )。
写到这里,你也许就明白了,如果想要对文件加密,那么就定义个加密文件类型,比如*.zec,然后在my_compile_file中,判断文件类型,如果是加密文件,那么就执行解密,嘿嘿,简单吧?
至于怎么加密,那就要问你自己了,你想用什么方式,但是,记住,要可逆的哦~~^_^。

?

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