/usr/lib/ruby/vendor_ruby/ohai/mixin/ec2_metadata.rb is in ohai 8.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | #
# Author:: Tim Dysinger (<tim@dysinger.net>)
# Author:: Benjamin Black (<bb@opscode.com>)
# Author:: Christopher Brown (<cb@opscode.com>)
# Copyright:: Copyright (c) 2009 Opscode, Inc.
# 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 'net/http'
require 'socket'
module Ohai
module Mixin
##
# This code parses the EC2 Instance Metadata API to provide details
# of the running instance.
#
# Earlier version of this code assumed a specific version of the
# metadata API was available. Unfortunately the API versions
# supported by a particular instance are determined at instance
# launch and are not extended over the life of the instance. As such
# the earlier code would fail depending on the age of the instance.
#
# The updated code probes the instance metadata endpoint for
# available versions, determines the most advanced version known to
# work and executes the metadata retrieval using that version.
#
# If no compatible version is found, an empty hash is returned.
#
module Ec2Metadata
EC2_METADATA_ADDR = "169.254.169.254" unless defined?(EC2_METADATA_ADDR)
EC2_SUPPORTED_VERSIONS = %w[ 1.0 2007-01-19 2007-03-01 2007-08-29 2007-10-10 2007-12-15
2008-02-01 2008-09-01 2009-04-04 2011-01-01 2011-05-01 2012-01-12 ]
EC2_ARRAY_VALUES = %w(security-groups)
EC2_ARRAY_DIR = %w(network/interfaces/macs)
EC2_JSON_DIR = %w(iam)
def can_metadata_connect?(addr, port, timeout=2)
t = Socket.new(Socket::Constants::AF_INET, Socket::Constants::SOCK_STREAM, 0)
saddr = Socket.pack_sockaddr_in(port, addr)
connected = false
begin
t.connect_nonblock(saddr)
rescue Errno::EINPROGRESS
r,w,e = IO::select(nil,[t],nil,timeout)
if !w.nil?
connected = true
else
begin
t.connect_nonblock(saddr)
rescue Errno::EISCONN
t.close
connected = true
rescue SystemCallError
end
end
rescue SystemCallError
end
Ohai::Log.debug("can_metadata_connect? == #{connected}")
connected
end
def best_api_version
response = http_client.get("/")
if response.code == '404'
Ohai::Log.debug("Received HTTP 404 from metadata server while determining API version, assuming 'latest'")
return "latest"
elsif response.code != '200'
raise "Unable to determine EC2 metadata version (returned #{response.code} response)"
end
# Note: Sorting the list of versions may have unintended consequences in
# non-EC2 environments. It appears to be safe in EC2 as of 2013-04-12.
versions = response.body.split("\n")
versions = response.body.split("\n").sort
until (versions.empty? || EC2_SUPPORTED_VERSIONS.include?(versions.last)) do
pv = versions.pop
Ohai::Log.debug("EC2 shows unsupported metadata version: #{pv}") unless pv == 'latest'
end
Ohai::Log.debug("EC2 metadata version: #{versions.last}")
if versions.empty?
raise "Unable to determine EC2 metadata version (no supported entries found)"
end
versions.last
end
def http_client
Net::HTTP.start(EC2_METADATA_ADDR).tap {|h| h.read_timeout = 600}
end
# Get metadata for a given path and API version
#
# @details
# Typically, a 200 response is expected for valid metadata.
# On certain instance types, traversing the provided metadata path
# produces a 404 for some unknown reason. In that event, return
# `nil` and continue the run instead of failing it.
def metadata_get(id, api_version)
path = "/#{api_version}/meta-data/#{id}"
response = http_client.get(path)
case response.code
when '200'
response.body
when '404'
Ohai::Log.debug("Encountered 404 response retreiving EC2 metadata path: #{path} ; continuing.")
nil
else
raise "Encountered error retrieving EC2 metadata (#{path} returned #{response.code} response)"
end
end
def fetch_metadata(id='', api_version=nil)
api_version ||= best_api_version
return Hash.new if api_version.nil?
metadata = Hash.new
retrieved_metadata = metadata_get(id, api_version)
if retrieved_metadata
retrieved_metadata.split("\n").each do |o|
key = expand_path("#{id}#{o}")
if key[-1..-1] != '/'
metadata[metadata_key(key)] =
if EC2_ARRAY_VALUES.include? key
retr_meta = metadata_get(key, api_version)
retr_meta ? retr_meta.split("\n") : retr_meta
else
metadata_get(key, api_version)
end
elsif not key.eql?(id) and not key.eql?('/')
name = key[0..-2]
sym = metadata_key(name)
if EC2_ARRAY_DIR.include?(name)
metadata[sym] = fetch_dir_metadata(key, api_version)
elsif EC2_JSON_DIR.include?(name)
metadata[sym] = fetch_json_dir_metadata(key, api_version)
else
fetch_metadata(key, api_version).each{|k,v| metadata[k] = v}
end
end
end
metadata
end
end
def fetch_dir_metadata(id, api_version)
metadata = Hash.new
retrieved_metadata = metadata_get(id, api_version)
if retrieved_metadata
retrieved_metadata.split("\n").each do |o|
key = expand_path(o)
if key[-1..-1] != '/'
retr_meta = metadata_get("#{id}#{key}", api_version)
metadata[metadata_key(key)] = retr_meta ? retr_meta : ''
elsif not key.eql?('/')
metadata[key[0..-2]] = fetch_dir_metadata("#{id}#{key}", api_version)
end
end
metadata
end
end
def fetch_json_dir_metadata(id, api_version)
metadata = Hash.new
retrieved_metadata = metadata_get(id, api_version)
if retrieved_metadata
retrieved_metadata.split("\n").each do |o|
key = expand_path(o)
if key[-1..-1] != '/'
retr_meta = metadata_get("#{id}#{key}", api_version)
data = retr_meta ? retr_meta : ''
json = StringIO.new(data)
parser = FFI_Yajl::Parser.new
metadata[metadata_key(key)] = parser.parse(json)
elsif not key.eql?('/')
metadata[key[0..-2]] = fetch_json_dir_metadata("#{id}#{key}", api_version)
end
end
metadata
end
end
def fetch_userdata()
api_version = best_api_version
return nil if api_version.nil?
response = http_client.get("/#{api_version}/user-data/")
response.code == "200" ? response.body : nil
end
private
def expand_path(file_name)
path = file_name.gsub(/\=.*$/, '/')
# ignore "./" and "../"
path.gsub(%r{/\.\.?(?:/|$)}, '/').
sub(%r{^\.\.?(?:/|$)}, '').
sub(%r{^$}, '/')
end
def metadata_key(key)
key.gsub(/\-|\//, '_')
end
end
end
end
|