table-from-snmp

#!/usr/bin/env ruby

require 'optparse'
require_relative File.join('..', 'lib', 'snmp_table_viewer')

def parse_command_line
  options = {
    SNMPTableViewer::Formatter::Table => {
      transpose: false,
    },
    snmp: {
      common: {
        version: 'v3',
        host: 'localhost',
        port: 161,
      },
      'v1' => {
        community: 'public',
      },
      'v2' => {
        community: 'public',
      },
      'v3' => {
        auth_protocol: :md5,
        priv_protocol: :des,
      },
    },
    base_oid: '',
    headings:  [],
    formatter: SNMPTableViewer::Formatter::Table,
  }
  snmp_version = 'v3'

  parser = OptionParser.new do |opts|
    opts.banner = "Usage: table-from-snmp [options]"

    opts.on('-h', '--help', '-?', 'Prints this help.') do
      puts opts
      exit
    end

    opts.on('--headings HEADINGS', Array, 'Headings to use in the table (e.g. "A, Bc, D").') do |v|
      options[:headings] += v.map(&:strip)
    end

    opts.on('--headings-for TYPE', String, "Use headings for this table type (#{SNMPTableViewer::HEADINGS_FOR.keys.join('|')}).") do |v|
      options[:headings] += SNMPTableViewer::HEADINGS_FOR[v] || []
    end

    opts.on('--format FORMAT', String, "How to format the output (#{SNMPTableViewer::FORMATTERS.keys.join('|')}) (default table).") do |v|
      options[:formatter] = SNMPTableViewer::FORMATTERS[v.downcase]
    end

    opts.on('--converter CONVERTER', String, "A converter to run on the data before formatting (#{SNMPTableViewer::CONVERTERS.keys.join('|')}).") do |v|
      options[:converter] = SNMPTableViewer::CONVERTERS[v.downcase]
    end


    opts.separator "\nSNMP common options:"

    opts.on('-vVERSION', '--version VERSION', 'SNMP version to use (1|2|3|) (default 3).') do |version|
      snmp_version = "v#{version}"
      options[:snmp][:common][:version] = snmp_version
    end

    opts.on('--host HOST', 'The host to connect to.') do |v|
      options[:snmp][:common][:host] = v
    end

    opts.on('p PORT', '--port PORT', Integer, 'SNMP port to connect to (default 161).') do |v|
      options[:snmp][:common][:port] = v
    end

    opts.on('--base-oid OID', 'The oid at the start of the table. Can by dotted numbers or ifTable') do |v|
      options[:base_oid] = SNMPTableViewer::BASE_OIDS[v.downcase] || v
    end



    opts.separator "\nSNMP version 1 and 2 options:"

    opts.on('-c COMMUNITY', '--comunity COMMUNITY', 'SNMP comunity (default "public").') do |community|
      options[:snmp][snmp_version][:community] = community
    end


    opts.separator "\nSNMP version 3 options:"

    opts.on('-u USER', '--user USER', '--username USER', 'SNMP user.') do |user|
      options[:snmp]['v3'][:username] = user
    end
    opts.on('-l LEVEL', '--security-level LEVEL', 'Security level to use (no_auth|auth_no_priv|auth_priv).') do |level|
      options[:snmp]['v3'][:security_level] = level
    end
    opts.on('-a AUTH_PROTOCOL', '--auth-protocol AUTH_PROTOCOL', 'Authentication protocol to use (MD5|SHA) (default MD5).') do |value|
      options[:snmp]['v3'][:auth_protocol] = value.downcase.to_sym
    end
    opts.on('-A AUTH_PASSWORD', '--auth-password AUTH_PASSWORD', 'Authentication password to use.', String) do |value|
      options[:snmp]['v3'][:auth_password] = value
    end
    opts.on('-x PRIV_PROTOCOL', '--priv-protocol PRIV_PROTOCOL', 'Privacy protocol to use (DES|AES) (default DES).') do |value|
      options[:snmp]['v3'][:priv_protocol] = value.downcase.to_sym
    end
    opts.on('-X PRIV_PASSWORD', '--priv-password PRIV_PASSWORD', 'Privacy password to use.', String) do |value|
      options[:snmp]['v3'][:priv_password] = value
    end


    opts.separator "\nTable formatter options:"
    opts.on('--[no-]transpose-table', 'Transpose the output table (swap rows and columns).') do |v|
      options[SNMPTableViewer::Formatter::Table][:transpose] = v
    end

  end # create parser
  
  parser.parse!(ARGV)
  options
end




options = parse_command_line
snmp_options = options[:snmp][:common].clone
snmp_options.merge!(options[:snmp][snmp_options[:version]])

data = SNMPTableViewer::Fetcher.from_snmp(base_oid: options[:base_oid], **snmp_options)

converter = options[:converter]
data = converter.convert(data) unless converter.nil?

formatter = options[:formatter]
formatter_options = options[formatter] || {}
formatter = formatter.new(data: data, headings: options[:headings])
puts formatter.output(**formatter_options)