我目前在 Suricata 中设置了以下 DNS 查询警报规则（用于测试目的）：
alert dns any any -> any any (msg:”Test dns_query option”; dns_query; content:”google”; nocase; sid:1;)
当它捕获包含单词“google”的DNS事件时触发，例如在这个数据包中：
{"timestamp":"2017-06-08T15:58:59.907085+0000","flow_id":1798294020028434,"in_iface":"ens33","event_type":"dns","src_ip":"172.16.10.132","src_port":53,"dest_ip":"192.168.160.140","dest_port":52385,"proto":"UDP","dns":{"type":"answer","id":57334,"rcode":"NOERROR","rrname":"www.google.com","rrtype":"A","ttl":300,"rdata":"172.217.12.164"}}
但是，我不想搜索包含“google”的资源记录名称，而是想使用这种相同类型的警报来触发解析为环回的 IP 地址，就像以下数据包的情况一样（注意该rdata字段）：
{"timestamp":"2017-06-08T15:59:37.120927+0000","flow_id":36683121284050,"in_iface":"ens33","event_type":"dns","src_ip":"172.16.10.132","src_port":53,"dest_ip":"192.168.160.140","dest_port":62260,"proto":"UDP","dns":{"type":"answer","id":53553,"rcode":"NOERROR","rrname":"outlook1.us","rrtype":"A","ttl":120,"rdata":"127.0.0.1"}}
正如我所注意到的，contentSuricata 规则部分仅搜索字符串。我当前的规则在与 rrname/domain 的文本匹配时触发，我将如何使规则在 rdata/IP 地址上触发？
ps 出于好奇，我尝试将警报内容部分中的“google”替换为“127.0.0.1”，但正如预期的那样，这也不起作用。