doubang9906
2018-09-21 20:06
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已采纳

从php文件执行脚本

I have a php file which is called by a website:

example: serial_tx.php?v=W100

Within the php I write a log file where I can see which string v I received (W100 in this case).

The webserver is hosted on a Raspberry Pi and should send this data to the uart.

The files locations:

/SCRIPTS/serial_tx.php
/SCRIPTS/c/jmsend/serial_tx  // the executable, compiled from a C script

If I am in the root of the webserver and, from the console of my Pi, I run

sudo /var/www/html/SCRIPTS/c/jmsend/serial_tx W100

I get the command sent correctly.

With the php file I tried with system, shell_exec and exec without success.

shell_exec("sudo /var/www/html/SCRIPTS/c/jmsend/serial_tx ".$ric);

$ric is the received command. I tried with different path settings too (starting from Pi root or webserver root). All the files have a 777 as permissions.

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我有一个由网站调用的php文件：

示例 ：serial_tx.php？v = W100

在php中我写了一个日志文件，在那里我可以看到我收到的字符串v（在这种情况下为W100）。 \ n

网络服务器托管在Raspberry Pi上，应将此数据发送给uart。

文件位置： 

   /SCRIPTS/serial_tx.php
/SCRIPTS/c/jmsend/serial_tx //可执行文件，从C脚本编译
   
 
 
如果我在根目录中 网络服务器，从我的Pi控制台，我运行 
 
 
  sudo / var / www / html / SCRIPTS / c / jmsend / serial_tx W100 
  <  / pre> 
 
 
我正确发送命令。 
 
 
使用php文件我尝试使用system，shell_exec和exec但没有成功。 
 \  n 
  shell_exec（“sudo / var / www / html / SCRIPTS / c / jmsend / serial_tx”。$ ric）; 
   
 
 
  $ ric 是收到的命令。
我尝试了不同的路径设置（从Pi ro开始 ot或webserver root）。
所有文件都有777作为权限。
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1条回答 默认 最新

  • dongmoyu0336 2018-09-21 20:53
    已采纳

    Something like this in /etc/sudoers should work to allow your web server user to run that particular command without issue:

    Cmnd_Alias SERIAL = /var/www/html/SCRIPTS/c/jmsend/serial_tx *
www-data ALL=(ALL) NOPASSWD: SERIAL

    Note that you must escape user input before using it:

    $ric = escapeshellarg($_GET["v"]);
shell_exec("sudo /var/www/html/SCRIPTS/c/jmsend/serial_tx $ric");

    You should also be aware of the differences between exec() and shell_exec(), specifically that you can't check for a failure using shell_exec().

    $ric = escapeshellarg($_GET["v"]);
exec("sudo /var/www/html/SCRIPTS/c/jmsend/serial_tx $ric", $output, $return);
if ($return !== 0) {
    // let the user know something didn't work
}

    This assumes, of course, that your executable is written to return appropriate error codes.

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