/usr/lib/ruby/vendor_ruby/ohai/mixin/gce_metadata.rb is in ohai 8.21.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Author:: Ranjib Dey (<dey.ranjib@gmail.com>)
# 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
module GCEMetadata
# Trailing dot to host is added to avoid DNS search path
GCE_METADATA_ADDR = "metadata.google.internal." unless defined?(GCE_METADATA_ADDR)
GCE_METADATA_URL = "/computeMetadata/v1/?recursive=true" unless defined?(GCE_METADATA_URL)
def can_metadata_connect?(addr, port, timeout = 2)
t = Socket.new(Socket::Constants::AF_INET, Socket::Constants::SOCK_STREAM, 0)
begin
saddr = Socket.pack_sockaddr_in(port, addr)
rescue SocketError => e # occurs when non-GCE systems try to resolve metadata.google.internal
Ohai::Log.debug("Mixin GCE: can_metadata_connect? failed setting up socket: #{e}")
return false
end
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("Mixin GCE: can_metadata_connect? == #{connected}")
connected
end
# fetch the meta content with a timeout and the required header
def http_get(uri)
conn = Net::HTTP.start(GCE_METADATA_ADDR)
conn.read_timeout = 6
conn.get(uri, initheader = { "Metadata-Flavor" => "Google" })
end
def fetch_metadata(id = "")
response = http_get("#{GCE_METADATA_URL}/#{id}")
return nil unless response.code == "200"
if json?(response.body)
data = StringIO.new(response.body)
parser = FFI_Yajl::Parser.new
parser.parse(data)
elsif has_trailing_slash?(id) || (id == "")
temp = {}
response.body.split("\n").each do |sub_attr|
temp[sanitize_key(sub_attr)] = fetch_metadata("#{id}#{sub_attr}")
end
temp
else
response.body
end
end
def json?(data)
data = StringIO.new(data)
parser = FFI_Yajl::Parser.new
begin
parser.parse(data)
true
rescue FFI_Yajl::ParseError
false
end
end
def multiline?(data)
data.lines.to_a.size > 1
end
def has_trailing_slash?(data)
!! ( data =~ %r{/$} )
end
def sanitize_key(key)
key.gsub(/\-|\//, "_")
end
end
end
end
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