Dashboards & Visualizations

Issue with mvindex in dashboard eval when using negative index value

eurban
Explorer

We are using Splunk 7.2.7.

When I use a negative index value in mvindex in a search eval, it works fine.

However, when I use a negative index value in a dashboard eval, it fails.

Here is a dashboard to demonstrate the issue.

alt text

Click on the "populate_tokens" cell in each row to populate the tokens that will display on the right-hand panel.

<dashboard>
  <label>mvindex Demo</label>
  <row>
    <panel>
      <title></title>
      <table>
        <search>
          <query>| makeresults
| eval ipv6_addr="[1:2:3:4:5:6:7:8]:80"
| append [| makeresults | eval ipv6_addr="[1:2:3:4:5:6:7:8]:443"]
| eval ipv6_port_mvindex_neg1 = mvindex(split(ipv6_addr,":"),-1)
| eval ipv6_port_mvindex_pos8 = mvindex(split(ipv6_addr,":"),8)
| eval populate_tokens = ""
| fields - _time
| fields ipv6_addr, ipv6_port_mvindex_pos8, ipv6_port_mvindex_neg1, populate_tokens</query>
          <earliest>-4h</earliest>
          <latest>now</latest>
          <sampleRatio>1</sampleRatio>
        </search>
        <option name="count">100</option>
        <option name="dataOverlayMode">none</option>
        <option name="drilldown">cell</option>
        <option name="percentagesRow">false</option>
        <option name="rowNumbers">true</option>
        <option name="totalsRow">false</option>
        <option name="wrap">true</option>
        <drilldown>
          <condition field="ipv6_addr"></condition>
          <condition field="ipv6_port_mvindex_pos8"></condition>
          <condition field="ipv6_port_mvindex_neg1"></condition>
          <condition field="populate_tokens">
            <eval token="ipv6_addr">$row.ipv6_addr$</eval>
            <eval token="row_ipv6_port_mvindex_neg1">$row.ipv6_port_mvindex_neg1$</eval>
            <eval token="row_ipv6_port_mvindex_pos8">$row.ipv6_port_mvindex_pos8$</eval>
            <eval token="mvindex_ipv6_port_mvindex_neg1">mvindex(split($row.ipv6_addr$,":"),-1)</eval>
            <eval token="mvindex_ipv6_port_mvindex_pos8">mvindex(split($row.ipv6_addr$,":"),8)</eval>
          </condition>
        </drilldown>
      </table>
    </panel>
    <panel>
      <html>
        <body>
          <h1>Token output</h1>
          <table style="width:100%">
            <tr>
              <th>Token name</th>
              <th>Token value</th>
            </tr>
            <tr>
              <td>ipv6_addr</td>
              <td>$ipv6_addr$</td>
            </tr>
            <tr>
              <td>row_ipv6_port_mvindex_neg1</td>
              <td>$row_ipv6_port_mvindex_neg1$</td>
            </tr>
            <tr>
              <td>row_ipv6_port_mvindex_pos8</td>
              <td>$row_ipv6_port_mvindex_pos8$</td>
            </tr>
            <tr>
              <td>mvindex_ipv6_port_mvindex_neg1</td>
              <td>$mvindex_ipv6_port_mvindex_neg1$</td>
            </tr>
            <tr>
              <td>mvindex_ipv6_port_mvindex_pos8</td>
              <td>$mvindex_ipv6_port_mvindex_pos8$</td>
            </tr>
          </table>
        </body>
      </html>
    </panel>
  </row>
</dashboard>
0 Karma

Sev
New Member

I know this Question is old and probably not relevant for you anymore, however I stumbled over the same Issue and wanted to share a possible solution.

I could not find any documentation on why mvindex is not working with negative values in the Dasboards, however there is a workaround.

 

<eval token="mvIndexValue">mvcount(<mvfield>)-1</eval>
<eval token="lastValue">mvindex(<mvfield>, $mvIndexValue$)</eval>

 

I think it's pretty ugly, but so far I have not found a better solution 😕

0 Karma
Get Updates on the Splunk Community!

Detecting Remote Code Executions With the Splunk Threat Research Team

WATCH NOWRemote code execution (RCE) vulnerabilities pose a significant risk to organizations. If exploited, ...

Enter the Splunk Community Dashboard Challenge for Your Chance to Win!

The Splunk Community Dashboard Challenge is underway! This is your chance to showcase your skills in creating ...

.conf24 | Session Scheduler is Live!!

.conf24 is happening June 11 - 14 in Las Vegas, and we are thrilled to announce that the conference catalog ...