清空 PHP SSH2 流内容，即使使用 stream_set_blocking?

问题描述

我正在开发一种工具，该工具使用 PECL SSH2 扩展通过 SSH2 从远程主机读取 iptables 配置.我能够成功连接到主机、进行身份验证并执行命令.我遇到的麻烦是有时流不包含任何数据.

I am working on a tool that reads an iptables configuration from a remote host over SSH2 using the PECL SSH2 extension. I am able to successfully make the connection to the host, authenticate, and execute commands. The trouble I am having is sometimes the stream doesn't contain any data.

 /**
  * Load the current firewall configuration
  * @return bool
  */
 public function loadRules() {
  $stream = ssh2_exec($this->connection,"~/iptsave;");
  stream_set_blocking($stream,true);
  $iptablesSave = stream_get_contents($stream);
  if(empty($iptablesSave)) {
   return false;
   }
  parent::restore($iptablesSave);
  return true;
  }

大约 25% 的时间，loadRules() 返回 false，即使连接到 locahost 而不是远程系统时也是如此.我能够通过将 ssh2_exec 调用更改为

About 25% of the time, loadRules() returns false, even when connecting to locahost instead of the remote system. I was able to work around the problem by changing the ssh2_exec call to

$stream = ssh2_exec($this->connection,"~/iptsave; sleep .5");

但我担心出了什么问题.

but I am concerned that something is wrong.

推荐答案

phpSecLib 或许可以提供帮助:

phpSecLib may be able to help:

根据这篇文章，它总是返回输出，与 ssh2.so 不同.

According to this post, it always returns the output, unlike ssh2.so.

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