Class: Resolv::Hosts

Overview

Hosts is a hostname resolver that uses the system hosts file.

.new(filename = DefaultFileName) ⇒ Hosts constructor

Creates a new Hosts, using filename for its data source.

#each_address(name, &proc)

Iterates over all IP addresses for name retrieved from the hosts file.
#each_name(address, &proc)

Iterates over all hostnames for address retrieved from the hosts file.
#getaddress(name)

Gets the IP address of name from the hosts file.
#getaddresses(name)

Gets all IP addresses for name from the hosts file.
#getname(address)

Gets the hostname of address from the hosts file.
#getnames(address)

Gets all hostnames for address from the hosts file.

Creates a new Hosts, using filename for its data source.

[ GitHub ]

# File 'lib/resolv.rb', line 181


def initialize(filename = DefaultFileName)
  @filename = filename
  @mutex = Thread::Mutex.new
  @initialized = nil
end

Iterates over all IP addresses for name retrieved from the hosts file.

[ GitHub ]

# File 'lib/resolv.rb', line 238


def each_address(name, &proc)
  lazy_initialize
  if @name2addr.include?(name)
    @name2addr[name].each(&proc)
  end
end

Iterates over all hostnames for address retrieved from the hosts file.

[ GitHub ]

# File 'lib/resolv.rb', line 265


def each_name(address, &proc)
  lazy_initialize
  @addr2name[address]&.each(&proc)
end

Gets the IP address of name from the hosts file.

Raises:

[ GitHub ]

# File 'lib/resolv.rb', line 221


def getaddress(name)
  each_address(name) {|address| return address}
  raise ResolvError.new("#{@filename} has no name: #{name}")
end

Gets all IP addresses for name from the hosts file.

[ GitHub ]

# File 'lib/resolv.rb', line 229


def getaddresses(name)
  ret = []
  each_address(name) {|address| ret << address}
  return ret
end

Gets the hostname of address from the hosts file.

Raises:

[ GitHub ]

# File 'lib/resolv.rb', line 248


def getname(address)
  each_name(address) {|name| return name}
  raise ResolvError.new("#{@filename} has no address: #{address}")
end

Gets all hostnames for address from the hosts file.

[ GitHub ]

# File 'lib/resolv.rb', line 256


def getnames(address)
  ret = []
  each_name(address) {|name| ret << name}
  return ret
end