Zend 扩展，获取 echo 的参数？

发布于 2024-12-07 19:18:47 字数 473 浏览 2 评论 0原文

我们已经制作了一个 Zend 扩展，我们想要写入 zval 的 echo 的地址应该写出，但我们无法弄清楚如何接收它们，因为我们注意到 echo "test"; 之间存在差异；和$a =“测试”；回显 $a;

.... Some stuff that overrides the echo opcode ....

FILE *tmpfile;
int echo_handler(ZEND_OPCODE_HANDLER_ARGS)
{
    zend_op *opline = execute_data->opline;
    tmpfile = fopen("/tmp/echo.test","a+");
    fprintf(tmpfile,"Echo was called\n");
    fclose(tmpfile);

    return ZEND_USER_OPCODE_DISPATCH;
}

无论参数是否是变量，我们如何获取参数？

原文

We have made a Zend extension which we want to write the addresses of the zval's echo is supposed to write out, but we cannot figure how to receive them because we have noticed that there is difference between echo "test"; and $a = "test"; echo $a;

.... Some stuff that overrides the echo opcode ....

FILE *tmpfile;
int echo_handler(ZEND_OPCODE_HANDLER_ARGS)
{
    zend_op *opline = execute_data->opline;
    tmpfile = fopen("/tmp/echo.test","a+");
    fprintf(tmpfile,"Echo was called\n");
    fclose(tmpfile);

    return ZEND_USER_OPCODE_DISPATCH;
}

How do we get the arguments no matter if it is a variable or not?

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吃不饱 2024-12-14 19:18:47

echo 的处理程序

static int ZEND_FASTCALL  ZEND_ECHO_SPEC_CONST_HANDLER(ZEND_OPCODE_HANDLER_ARGS)
{
    zend_op *opline = EX(opline);

    zval z_copy;
    zval *z = &opline->op1.u.constant;

    if (IS_CONST != IS_CONST &&
        Z_TYPE_P(z) == IS_OBJECT && Z_OBJ_HT_P(z)->get_method != NULL &&
        zend_std_cast_object_tostring(z, &z_copy, IS_STRING TSRMLS_CC) == SUCCESS) {
        zend_print_variable(&z_copy);
        zval_dtor(&z_copy);
    } else {
        zend_print_variable(z);
    }

    ZEND_VM_NEXT_OPCODE();
}

来自 Zend/zend_vm_execute.h，正如您所看到的，它基本上所做的就是调用 zend_print_variable()。

挂钩该功能，您应该走在正确的轨道上。

奖励：它也适用于print语句。

The handler for echo is

static int ZEND_FASTCALL  ZEND_ECHO_SPEC_CONST_HANDLER(ZEND_OPCODE_HANDLER_ARGS)
{
    zend_op *opline = EX(opline);

    zval z_copy;
    zval *z = &opline->op1.u.constant;

    if (IS_CONST != IS_CONST &&
        Z_TYPE_P(z) == IS_OBJECT && Z_OBJ_HT_P(z)->get_method != NULL &&
        zend_std_cast_object_tostring(z, &z_copy, IS_STRING TSRMLS_CC) == SUCCESS) {
        zend_print_variable(&z_copy);
        zval_dtor(&z_copy);
    } else {
        zend_print_variable(z);
    }

    ZEND_VM_NEXT_OPCODE();
}

from Zend/zend_vm_execute.h, and as you can see all it basically does is to call zend_print_variable().

Hook that function and you should be on the right track.

Bonus: it works for print statements too.

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