Class: Dnsruby::Hosts
- Inherits:
-
Object
- Object
- Dnsruby::Hosts
- Defined in:
- lib/dnsruby/hosts.rb
Overview
hostnames lookup methods.
Constant Summary collapse
- DefaultFileName =
'/etc/hosts'
Instance Method Summary collapse
-
#each_address(name, &proc) ⇒ Object
Iterates over all IP addresses for
name
retrieved from the hosts file. -
#each_name(address, &proc) ⇒ Object
Iterates over all hostnames for
address
retrieved from the hosts file. -
#getaddress(name) ⇒ Object
Gets the first IP address for
name
from the hosts file. -
#getaddresses(name) ⇒ Object
Gets all IP addresses for
name
from the hosts file. -
#getname(address) ⇒ Object
Gets the first hostname of
address
from the hosts file. -
#getnames(address) ⇒ Object
Gets all hostnames for
address
from the hosts file. -
#initialize(filename = DefaultFileName) ⇒ Hosts
constructor
Creates a new Dnsruby::Hosts using
filename
for its data source. -
#lazy_initialize ⇒ Object
:nodoc:.
Constructor Details
#initialize(filename = DefaultFileName) ⇒ Hosts
Creates a new Dnsruby::Hosts using filename
for its data source
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# File 'lib/dnsruby/hosts.rb', line 43 def initialize(filename = DefaultFileName) @filename = filename @mutex = Mutex.new @initialized = nil end |
Instance Method Details
#each_address(name, &proc) ⇒ Object
Iterates over all IP addresses for name
retrieved from the hosts file
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# File 'lib/dnsruby/hosts.rb', line 98 def each_address(name, &proc) lazy_initialize if @name2addr.include?(name) @name2addr[name].each(&proc) end end |
#each_name(address, &proc) ⇒ Object
Iterates over all hostnames for address
retrieved from the hosts file
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# File 'lib/dnsruby/hosts.rb', line 119 def each_name(address, &proc) lazy_initialize if @addr2name.include?(address) @addr2name[address].each(&proc) end end |
#getaddress(name) ⇒ Object
Gets the first IP address for name
from the hosts file
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# File 'lib/dnsruby/hosts.rb', line 85 def getaddress(name) each_address(name) {|address| return address} raise ResolvError.new("#{@filename} has no name: #{name}") end |
#getaddresses(name) ⇒ Object
Gets all IP addresses for name
from the hosts file
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# File 'lib/dnsruby/hosts.rb', line 91 def getaddresses(name) ret = [] each_address(name) {|address| ret << address} return ret end |
#getname(address) ⇒ Object
Gets the first hostname of address
from the hosts file
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# File 'lib/dnsruby/hosts.rb', line 106 def getname(address) each_name(address) {|name| return name} raise ResolvError.new("#{@filename} has no address: #{address}") end |
#getnames(address) ⇒ Object
Gets all hostnames for address
from the hosts file
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# File 'lib/dnsruby/hosts.rb', line 112 def getnames(address) ret = [] each_name(address) {|name| ret << name} return ret end |
#lazy_initialize ⇒ Object
:nodoc:
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# File 'lib/dnsruby/hosts.rb', line 49 def lazy_initialize# :nodoc: @mutex.synchronize { unless @initialized @name2addr = {} @addr2name = {} begin open(@filename) {|f| f.each {|line| line.sub!(/#.*/, '') addr, hostname, *aliases = line.split(/\s+/) next unless addr addr.untaint hostname.untaint @addr2name[addr] = [] unless @addr2name.include? addr @addr2name[addr] << hostname @addr2name[addr] += aliases @name2addr[hostname] = [] unless @name2addr.include? hostname @name2addr[hostname] << addr aliases.each {|n| n.untaint @name2addr[n] = [] unless @name2addr.include? n @name2addr[n] << addr } } } rescue Exception # Java won't find this file if running on Windows end @name2addr.each {|name, arr| arr.reverse!} @initialized = true end } self end |