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Network Health Check

Configurable command line application that can be used to test network conditions are as expected.

Very early work in progress version!

Quickstart

Installation

pip install netcheck

Individual Assertions

By default netcheck won't output anything if the check passes.

$ poetry run netcheck dns

Pass the -v flag to see what is going on:

$ poetry run netcheck dns -v
DNS check with nameserver None looking up host 'github.com'
✔ Passed (as expected)
{
  "type": "dns",
  "nameserver": null,
  "host": "github.com",
  "timeout": 10,
  "result": {
    "A": [
      "20.248.137.48"
    ]
  }
}

Each check can be configured, e.g. you can specify the server and host for a dns check, and tell netcheck whether a particular configuration is expected to pass or fail:

$ poetry run netcheck dns --server 1.1.1.1 --host hardbyte.nz --should-pass -v
DNS check with nameserver 1.1.1.1 looking up host 'hardbyte.nz'
✔ Passed (as expected)
{
  "type": "dns",
  "nameserver": "1.1.1.1",
  "host": "hardbyte.nz",
  "timeout": 10,
  "result": {
    "A": [
      "209.58.165.79"
    ]
  }
}

A few other individual examples:

$ netcheck dns --server=1.1.1.1 --host=made.updomain --should-fail -v
DNS check with nameserver 1.1.1.1 looking up host 'made.updomain'
❌ Failed. As expected.
{
  "type": "dns",
  "nameserver": "1.1.1.1",
  "host": "made.updomain",
  "timeout": 10,
  "result": {
    "exception-type": "NXDOMAIN",
    "exception": "The DNS query name does not exist: made.updomain."
  }
}

$ netcheck http --method=get --url=https://s3.ap-southeast-2.amazonaws.com --should-pass
$ poetry run netcheck http --method=post --url=https://s3.ap-southeast-2.amazonaws.com --should-fail -v
http check with url 'https://s3.ap-southeast-2.amazonaws.com'
❌ Failed. As expected.
{
  "type": "http",
  "method": "post",
  "url": "https://s3.ap-southeast-2.amazonaws.com",
  "result": {
    "status-code": 405,
    "exception-type": "HTTPError",
    "exception": "405 Client Error: Method Not Allowed for url: https://s3.ap-southeast-2.amazonaws.com/"
  }
}

Configuration via file

The main way to run netcheck is passing in a list of assertions. A json file can be provided with a list of assertions to be checked:

{
  "assertions": [
    {"name":  "deny-cloudflare-dns", "rules": [{"type": "dns", "server":  "1.1.1.1", "host": "github.com", "expected": "pass"}] }
  ]
}

And the command can be called:

$ poetry run netcheck run --config config.json 
Loaded 2 assertions
Running test 'cloudflare-dns'
Running test 'github-status'

Or with --verbose:

$ poetry run netcheck run --config tests/testdata/simple-config.json -v
Loaded 2 assertions
Running test 'cloudflare-dns'
DNS check with nameserver 1.1.1.1 looking up host 'github.com' Passed (as expected)
{
  "type": "dns",
  "nameserver": "1.1.1.1",
  "host": "github.com",
  "timeout": 10,
  "result": {
    "A": [
      "20.248.137.48"
    ]
  }
}
Running test 'github-status'
http check with url 'https://github.com/status' Passed (as expected)
{
  "type": "http",
  "method": "get",
  "url": "https://github.com/status",
  "result": {
    "status-code": 200
  }
}

Development

Build and publish with poetry. First update the version.

poetry version patch
poetry build
poetry publish

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