Nsca tools library

Introduction

This library is based Nagios's NSCA server but written in Go.

The goal is to have a library to receive the nsca calls and do whatever you want with the data you receive. Working on that for another application I'm writing.

The technical documentation is available on godoc: https://godoc.org/github.com/tubemogul/nscatools

Prerequisites

For now, due to libmcrypt specificities, this library uses directly the C bindings of libmcrypt, so you will need the libmcrypt4 and libmcrypt-dev packages installed (at least that's their names on Debian-based systems).

Usage examples

Create a NSCA server

This example shows how to use this library to the detail of every packets you receive. Not very useful as is but simple enough for everybody to understand it.

package main

import (
  nsrv "github.com/tubemogul/nscatools"
  "log"
  "os"
)

var dbg *log.Logger

func printData(p *nsrv.DataPacket) error {
  dbg.Printf("version: %d\n", p.Version)
  dbg.Printf("crc: %d\n", p.Crc)
  dbg.Printf("timestamp: %d\n", p.Timestamp)
  dbg.Printf("state: %d\n", p.State)
  dbg.Printf("hostname: %s\n", p.HostName)
  dbg.Printf("service: %s\n", p.Service)
  dbg.Printf("Plugin output: %s\n", p.PluginOutput)
  return nil
}

func main() {
  debugHandle := os.Stdout
  dbg = log.New(debugHandle, "[DEBUG] ", log.Ldate|log.Ltime|log.Lshortfile)

  cfg := nsrv.NewConfig("localhost", 5667, nsrv.EncryptXOR, "toto", printData)
  nsrv.StartServer(cfg, true)
}

To do functionnal testing, you can, for example, use the following send_nsca.cfg file:

password=toto
encryption_method=1

And use the following command:

echo "myhost mysvc 1 mymessage" | sudo /usr/sbin/send_nsca -H 127.0.0.1 -p 5667 -d ' ' -c send_nsca.cfg

Create a NSCA client

This example shows how to implement a nsca client using this library. You can use it directly with the running server you created in the previous example.

package main

import (
  "fmt"
  nsrv "github.com/tubemogul/nscatools"
)

func main() {
  cfg := nsrv.NewConfig("localhost", 5667, nsrv.EncryptXOR, "toto", nil)
  err := nsrv.SendStatus(cfg, "myHost", "my service", nsrv.StateWarning, "You'd better fix me before I go critical")
  if err != nil {
    fmt.Printf("SendStatus returned an error: %s\n", err)
  } else {
    fmt.Println("Packet sent successfuly")
  }
}

Using the Makefile

• make lint: runs golint on your files (requires github.com/golang/lint/golint installed)
• make fmt: checks that the files are compliant with the gofmt format
• make vet: runs go tool vet on your files to ensure there's no problems
• make test: runs make lint, make fmt, make vet before running all the test, printing also the percentage of code coverage
• make race: runs the tests with the -race option to detect race conditions
• make bench: runs the benchmarks
• make gocov: runs a gocov report (requires github.com/axw/gocov/gocov)
• make install: runs make test before running a clean and install
• make / make all: run make test, make race and make bench

Contributions

Contributions to this project are welcome, though please file an issue. before starting work on anything major as someone else could already be working on it.

Contributions that do not provide the corresponding tests will not be accepted. Contributions that do not pass the basic gofmt, vet and other basic checks provided in the Makefile will not be accepted. It's just a question of trying to keep a basic code standard. Thanks for your help! :)

TODO

For now the following algorithms are not properly handled, so they need to be fixed:

• 3WAY
• ARCFOUR
• WAKE
• ENIGMA
• SAFER64
• SAFER128

Nice to have:

• get rid of the libmcrypt C bindings to rely only on pure Go
• write examples
• write more benchmark