traceroute parser unable to grab IP when using "-n"

Hi! I’m using jc’s traceroute parser to automate networking tests with pytest. it’s pretty damn useful!

I’m using jc version 1.14.3 on debian bullseye for the tests, but I’ve also verified that the same behaviour is happening with jc 1.20.0 in debian sid

I’ve just hit a tiny snag while using it: apparently when we give traceroute a -n argument, the parser is not able to grab the IP adresses anymore.

I’m wondering if the parser needs to match the hostname only conditionally… but I have not yet taken a look at the parser’s code.

Here’s an example of what happens – I’ve added -q 1 just to make the output more concise but the same happens without it (the number of hops seems correct but all of the “ip” fields are empty):

$ jc -p traceroute -n -q1 www.koumbit.org
{
  "destination_ip": "199.58.80.40",
  "destination_name": "www.koumbit.org",
  "hops": [
    {
      "hop": 1,
      "probes": [
        {
          "annotation": null,
          "asn": null,
          "ip": null,
          "name": null,
          "rtt": 0.95
        }
      ]
    },
    {
      "hop": 2,
      "probes": [
        {
          "annotation": null,
          "asn": null,
          "ip": null,
          "name": null,
          "rtt": 12.635
        }
      ]
    },
    {
      "hop": 3,
      "probes": [
        {
          "annotation": null,
          "asn": null,
          "ip": null,
          "name": null,
          "rtt": 20.982
        }
      ]
    },
    {
      "hop": 4,
      "probes": [
        {
          "annotation": null,
          "asn": null,
          "ip": null,
          "name": null,
          "rtt": 19.329
        }
      ]
    },
    {
      "hop": 5,
      "probes": [
        {
          "annotation": null,
          "asn": null,
          "ip": null,
          "name": null,
          "rtt": 20.229
        }
      ]
    },
    {
      "hop": 6,
      "probes": [
        {
          "annotation": null,
          "asn": null,
          "ip": null,
          "name": null,
          "rtt": 20.887
        }
      ]
    },
    {
      "hop": 7,
      "probes": [
        {
          "annotation": null,
          "asn": null,
          "ip": null,
          "name": null,
          "rtt": 20.315
        }
      ]
    },
    {
      "hop": 8,
      "probes": [
        {
          "annotation": null,
          "asn": null,
          "ip": null,
          "name": null,
          "rtt": 21.653
        }
      ]
    }
  ]
}

[lelutin]

nice! I’ve tested again the 4 cases with the new version. ipv4 with(out) -n and ipv6 with(out) -n and it all seems to be working great. many thanks for such a quick fix! 😃

[kellyjonbrazil]

Released in v1.21.0 available via pip. Binaries coming soon.