使用Nokogiri

时间:2017-07-27 22:10:44

标签: ruby-on-rails ruby nokogiri

我正在尝试解析一些nmap XML以通过Nokogiri检索各种值,但是有很长时间才能计算出递归。我想要的是获取ip_address和任何具有port子元素的status='open'元素。我希望能够将每个组放入一个JSON对象中以保存到数据库列中以供以后显示:

到目前为止,这是我的代码:

require 'nokogiri'
require 'json'

doc = File.open("network_ports.xml") { |f| Nokogiri::XML(f) }

doc.xpath('//host').each do |host|
  @ip_address = host.at_xpath("address[@addrtype='ipv4']").at_xpath("@addr").value
  puts "Found Host: #{@ip_address}"
  host.xpath('ports/port').each do |port|    
    if port.at_xpath("state[@state='open']")
      puts port.at_xpath("port[@portid]").value
    end
  end
end

但是我的输出现在被破坏,出现以下错误:

port_parser.rb:11:in `block (2 levels) in <main>': undefined method `value' for nil:NilClass (NoMethodError)

文件中的一些相同输入:

<host starttime="1501187906" endtime="1501189103"><status state="up" reason="syn-ack" reason_ttl="0"/>
<address addr="10.10.10.1" addrtype="ipv4"/>
<hostnames>
<hostname name="eclipse" type="PTR"/>
</hostnames>
<ports><extraports state="closed" count="996">
<extrareasons reason="conn-refused" count="996"/>
</extraports>
<port protocol="tcp" portid="53"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="domain" product="dnsmasq" version="2.45" method="probed" conf="10"><cpe>cpe:/a:thekelleys:dnsmasq:2.45</cpe></service></port>
<port protocol="tcp" portid="80"><state state="filtered" reason="syn-ack" reason_ttl="0"/><service name="http" product="DD-WRT milli_httpd" hostname="eclipse" method="probed" conf="10"/></port>
<port protocol="tcp" portid="443"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="https" tunnel="ssl" method="table" conf="3"/></port>
<port protocol="tcp" portid="2222"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="ssh" product="Dropbear sshd" version="0.52" extrainfo="protocol 2.0" ostype="Linux" method="probed" conf="10"><cpe>cpe:/a:matt_johnston:dropbear_ssh_server:0.52</cpe><cpe>cpe:/o:linux:linux_kernel</cpe></service></port>
</ports>
<times srtt="4727" rttvar="1840" to="100000"/>
</host>

我遇到了一个问题,因为我依赖于state元素中的嵌套port元素,我需要能够获取portid属性值吗?

最后,我只是希望得到一些输出:

Found host: 10.10.10.1
    port 22/tcp open
    port 23/tcp open
Found host: 10.10.10.2
    port 443/tcp open
    port 5432/tcp open
etc...

如果您对清理代码有任何建议,我也很满意!

2 个答案:

答案 0 :(得分:1)

除了

之外,您的代码的所有内容似乎都运行良好
puts port.at_xpath("port[@portid]").value

您已经在port元素,因此您只需要xpath @portid

puts port.at_xpath("@portid").value

,以及您的示例 network_ports.xml ,输出

# Found Host: 10.10.10.1
# 53
# 443
# 2222

答案 1 :(得分:0)

您知道NMAP gem吗?

require 'nmap/xml'

Nmap::XML.new('scan.xml') do |xml|
  xml.each_host do |host|
    puts "[#{host.ip}]"

    host.each_port do |port|
      puts "  #{port.number}/#{port.protocol}\t#{port.state}\t#{port.service}"
    end
  end
end