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require 'mauve/sender'
require 'mauve/proto'
require 'ipaddr'
require 'socket'
#
# This class encapsulates the raising and clearing of alerts via Mauve.
#
# There is a helper method to update any alerts with details of whether the
# affected host is inside/outside the Bytemark network.
#
#
class Alerter
attr_reader :details
BYTEMARK_RANGES = %w(80.68.80.0/20 89.16.160.0/19 212.110.160.0/19 46.43.0.0/18 91.223.58.0/24 213.138.96.0/19 5.153.224.0/21 2001:41c8::/32).collect{|i| IPAddr.new(i)}
def initialize( test_details )
@details = test_details
end
#
# Expand to a message indicating whether a hostname is inside bytemark.
#
def expand_inside_bytemark( host )
target = host
if ( target =~ /https?:\/\/([^\/]+)/ )
target = $1.dup
end
#
# Resolved IP of the target
#
resolved = nil
#
# Resolve the target to an IP, unless it is already an address.
#
if ( ( target =~ /^([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)$/ ) ||
( target =~ /^([0-9a-f:]+)$/ ) )
resolved = target
else
begin
Socket.getaddrinfo(target, 'echo').each do |a|
resolved = a[3] if ( a )
end
rescue SocketError
resolved = nil
end
end
#
# Did we get an error?
#
return "" unless ( !resolved.nil? )
#
# Make any HTTP target a link in the details.
#
if ( host =~ /^http/ )
host = "<a href=\"#{host}\">#{host}</a>"
end
#
# Test trange, and format the appropriate message.
#
if ( BYTEMARK_RANGES.any?{|range| range.include?(IPAddr.new(resolved.to_s))} )
return "<p>#{host} resolves to #{resolved} which is inside the Bytemark network.</p>"
else
return "<p>#{host} resolves to #{resolved} which is not inside the Bytemark network.</p>"
end
end
#
# Resolve an IP address
#
def document_address( address )
raise ArgumentError, "Address must not be nil" if ( address.nil? )
begin
Resolv.new.getname(address)
rescue
nil
end
end
#
# Raise the alert.
#
def raise( detail )
#
# Is this alert affecting a machine inside/outside our network
#
inside = expand_inside_bytemark( @details["target_host"] )
#
# Document the hostname if the alert relates to an IP address.
#
resolved = ""
if ( ( @details["target_host"] =~ /^([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)$/ ) ||
( @details["target_host"] =~ /^([0-9a-f:]+)$/ ) )
resolved = document_address( @details["target_host"] )
if ( resolved.nil? )
resolved = ""
else
resolved = "The IP address #{@details["target_host"]} resolves to #{resolved}."
end
end
update = Mauve::Proto::AlertUpdate.new
update.alert = []
update.source = "custodian"
# be explicit about raising/clearing
update.replace = false
alert = Mauve::Proto::Alert.new
# e.g. ping-example.vm.bytemark.co.uk
# e.g. http-http://example.com/page1
alert.id = "#{@details['test_type']}-#{@details['target_host']}"
alert.subject = @details['target_host']
alert.summary = @details['test_alert']
alert.detail = "#{inside} <p>The #{@details['test_type']} test failed against #{@details['target_host']}: #{detail}</p><p>#{resolved}</p>"
alert.raise_time = Time.now.to_i
update.alert << alert
Mauve::Sender.new("alert.bytemark.co.uk").send(update)
end
#
# Clear the alert.
#
def clear
#
# Is this alert affecting a machine inside/outside our network
#
inside = expand_inside_bytemark( @details["target_host"] )
#
# Document the hostname if the alert relates to an IP address.
#
resolved = ""
if ( ( @details["target_host"] =~ /^([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)$/ ) ||
( @details["target_host"] =~ /^([0-9a-f:]+)$/ ) )
resolved = document_address( @details["target_host"] )
if ( resolved.nil? )
resolved = ""
else
resolved = "The IP address #{@details["target_host"]} resolves to #{resolved}."
end
end
update = Mauve::Proto::AlertUpdate.new
update.alert = []
update.source = "custodian"
# be explicit about raising/clearing
update.replace = false
alert = Mauve::Proto::Alert.new
# e.g. ping-example.vm.bytemark.co.uk
# e.g. http-http://example.com/page1
alert.id = "#{@details['test_type']}-#{@details['target_host']}"
alert.subject = @details['target_host']
alert.summary = @details['test_alert']
alert.detail = "#{inside} <p>The #{@details['test_type']} test succeeded against #{@details['target_host']}</p><p>#{resolved}</p>"
alert.clear_time = Time.now.to_i
update.alert << alert
Mauve::Sender.new("alert.bytemark.co.uk").send(update)
end
end
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