summaryrefslogtreecommitdiff
path: root/lib/chef/provider/route.rb
blob: f2b7b33419ca1ed0814b3c3d2e618f51e3e4e6a0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
#
# Author:: Bryan McLellan (btm@loftninjas.org), Jesse Nelson (spheromak@gmail.com)
# Copyright:: Copyright 2009-2016, Bryan McLellan
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

require "chef/log"
require "chef/mixin/command"
require "chef/provider"
require "ipaddr"

class Chef
  class Provider
    class Route < Chef::Provider
      include Chef::Mixin::Command

      provides :route

      attr_accessor :is_running

      MASK = { "0.0.0.0"          => "0",
               "128.0.0.0"        => "1",
               "192.0.0.0"        => "2",
               "224.0.0.0"        => "3",
               "240.0.0.0"        => "4",
               "248.0.0.0"        => "5",
               "252.0.0.0"        => "6",
               "254.0.0.0"        => "7",
               "255.0.0.0"        => "8",
               "255.128.0.0"      => "9",
               "255.192.0.0"      => "10",
               "255.224.0.0"      => "11",
               "255.240.0.0"      => "12",
               "255.248.0.0"      => "13",
               "255.252.0.0"      => "14",
               "255.254.0.0"      => "15",
               "255.255.0.0"      => "16",
               "255.255.128.0"    => "17",
               "255.255.192.0"    => "18",
               "255.255.224.0"    => "19",
               "255.255.240.0"    => "20",
               "255.255.248.0"    => "21",
               "255.255.252.0"    => "22",
               "255.255.254.0"    => "23",
               "255.255.255.0"    => "24",
               "255.255.255.128"  => "25",
               "255.255.255.192"  => "26",
               "255.255.255.224"  => "27",
               "255.255.255.240"  => "28",
               "255.255.255.248"  => "29",
               "255.255.255.252"  => "30",
               "255.255.255.254"  => "31",
               "255.255.255.255"  => "32" }.freeze

      def hex2ip(hex_data)
        # Cleanup hex data
        hex_ip = hex_data.to_s.downcase.gsub(/[^0-9a-f]/, "")

        # Check hex data format (IP is a 32bit integer, so should be 8 chars long)
        return nil if hex_ip.length != hex_data.length || hex_ip.length != 8

        # Extract octets from hex data
        octets = hex_ip.scan(/../).reverse.collect { |octet| [octet].pack("H2").unpack("C").first }

        # Validate IP
        ip = octets.join(".")
        begin
          IPAddr.new(ip, Socket::AF_INET).to_s
        rescue ArgumentError
          Chef::Log.debug("Invalid IP address data: hex=#{hex_ip}, ip=#{ip}")
          return nil
        end
      end

      def whyrun_supported?
        true
      end

      def load_current_resource
        self.is_running = false

        # cidr or quad dot mask
        new_ip = if new_resource.netmask
                   IPAddr.new("#{new_resource.target}/#{new_resource.netmask}")
                 else
                   IPAddr.new(new_resource.target)
                 end

        # For linux, we use /proc/net/route file to read proc table info
        return if node[:os] != "linux"

        route_file = ::File.open("/proc/net/route", "r")

        # Read all routes
        while (line = route_file.gets)
          # Get all the fields for a route
          _, destination, gateway, _, _, _, _, mask = line.split

          # Convert hex-encoded values to quad-dotted notation (e.g. 0064A8C0 => 192.168.100.0)
          destination = hex2ip(destination)
          gateway = hex2ip(gateway)
          mask = hex2ip(mask)

          # Skip formatting lines (header, etc)
          next unless destination && gateway && mask
          Chef::Log.debug("#{new_resource} system has route: dest=#{destination} mask=#{mask} gw=#{gateway}")

          # check if what were trying to configure is already there
          # use an ipaddr object with ip/mask this way we can have
          # a new resource be in cidr format (i don't feel like
          # expanding bitmask by hand.
          #
          running_ip = IPAddr.new("#{destination}/#{mask}")
          Chef::Log.debug("#{new_resource} new ip: #{new_ip.inspect} running ip: #{running_ip.inspect}")
          self.is_running = true if running_ip == new_ip && gateway == new_resource.gateway
        end

        route_file.close
      end

      def action_add
        # check to see if load_current_resource found the route
        if is_running
          Chef::Log.debug("#{new_resource} route already active - nothing to do")
        else
          command = generate_command(:add)
          converge_by("run #{command.join(' ')} to add route") do
            shell_out_compact!(command)
            Chef::Log.info("#{new_resource} added")
          end
        end

        # for now we always write the file (ugly but its what it is)
        generate_config
      end

      def action_delete
        if is_running
          command = generate_command(:delete)
          converge_by("run #{command.join(' ')} to delete route ") do
            shell_out_compact!(command)
            Chef::Log.info("#{new_resource} removed")
          end
        else
          Chef::Log.debug("#{new_resource} route does not exist - nothing to do")
        end

        # for now we always write the file (ugly but its what it is)
        generate_config
      end

      def generate_config
        conf = {}
        case node[:platform]
        when "centos", "redhat", "fedora"
          # walk the collection
          run_context.resource_collection.each do |resource|
            next unless resource.is_a? Chef::Resource::Route
            # default to eth0
            dev = if resource.device
                    resource.device
                  else
                    "eth0"
                  end

            conf[dev] = "" if conf[dev].nil?
            case @action
            when :add
              conf[dev] << config_file_contents(:add, target: resource.target, netmask: resource.netmask, gateway: resource.gateway) if resource.action == [:add]
            when :delete
              # need to do this for the case when the last route on an int
              # is removed
              conf[dev] << config_file_contents(:delete)
            end
          end
          conf.each do |k, v|
            network_file_name = "/etc/sysconfig/network-scripts/route-#{k}"
            converge_by("write route route.#{k}\n#{conf[k]} to #{network_file_name}") do
              network_file = ::File.new(network_file_name, "w")
              network_file.puts(conf[k])
              Chef::Log.debug("#{new_resource} writing route.#{k}\n#{conf[k]}")
              network_file.close
            end
          end
        end
      end

      def generate_command(action)
        target = new_resource.target
        target = "#{target}/#{MASK[new_resource.netmask.to_s]}" if new_resource.netmask

        case action
        when :add
          command = [ "ip", "route", "replace", target ]
          command += [ "via", new_resource.gateway ] if new_resource.gateway
          command += [ "dev", new_resource.device ] if new_resource.device
        when :delete
          command = [ "ip", "route", "delete", target ]
          command += [ "via", new_resource.gateway ] if new_resource.gateway
        end

        command
      end

      def config_file_contents(action, options = {})
        content = ""
        case action
        when :add
          content << (options[:target]).to_s
          content << "/#{options[:netmask]}" if options[:netmask]
          content << " via #{options[:gateway]}" if options[:gateway]
          content << "\n"
        end

        content
      end
    end
  end
end