Class: IPAddress::Ipv4

Inherits:
Object
  • Object
show all
Defined in:
lib/ipaddress/ipv4.rb

Class Method Summary collapse

Class Method Details

.create(str) ⇒ Object 



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# File 'lib/ipaddress/ipv4.rb', line 39

def self.create(str)
  tmp = IPAddress.split_at_slash(str)
  ip = tmp[0]
  netmask = tmp[1]
  if (!IPAddress.is_valid_ipv4(ip))
    #puts "-1"
    return nil
  end

  ip_prefix_num = 32
  if (netmask)
    ip_prefix_num = IPAddress.parse_netmask_to_prefix(netmask)
    if (ip_prefix_num.nil?)
      ##puts "-2"
      return nil
    end
  end

  ip_prefix = Prefix32.create(ip_prefix_num)
  if (ip_prefix.nil?)
    #puts "-3"
    return nil
  end

  split_number = IPAddress.split_to_u32(ip)
  if (split_number.nil?)
    #puts "-4"
    return nil
  end

  return IPAddress.new({
    ip_bits: IpBits.v4(),
    host_address: split_number,
    prefix: ip_prefix,
    mapped: nil,
    vt_is_private: -> (a) { Ipv4.ipv4_is_private(a) },
    vt_is_loopback: -> (a) { Ipv4.ipv4_is_loopback(a) },
    vt_to_ipv6: -> (a) { Ipv4.to_ipv6(a) }
  })
end

.from_number(addr, prefix_num) ⇒ Object 



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# File 'lib/ipaddress/ipv4.rb', line 22

def self.from_number(addr, prefix_num)
  prefix = Prefix32.create(prefix_num)
  if (!prefix)
    return nil
  end

  return IPAddress.new({
    ip_bits: IpBits.v4(),
    host_address: addr.clone(),
    prefix: prefix,
    mapped: nil,
    vt_is_private: ->(a) {Ipv4.ipv4_is_private },
    vt_is_loopback: ->(a) {Ipv4.ipv4_is_loopback},
    vt_to_ipv6: ->(a) {Ipv4.to_ipv6}
  })
end

.ipv4_is_loopback(my) ⇒ Object 



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# File 'lib/ipaddress/ipv4.rb', line 87

def self.ipv4_is_loopback(my)
  return IPAddress.parse("127.0.0.0/8").includes(my)
end

.ipv4_is_private(my) ⇒ Object 



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# File 'lib/ipaddress/ipv4.rb', line 80

def self.ipv4_is_private(my)
  return !!([IPAddress.parse("10.0.0.0/8"),
          IPAddress.parse("172.16.0.0/12"),
          IPAddress.parse("192.168.0.0/16")]
    .find{|i|  i.includes(my)})
end

.is_class_a(my) ⇒ Object

Checks whether the ip address belongs to a

RFC 791 CLASS A network, no matter
what the subnet mask is.

Example:

  ip = IPAddress("10.0.0.1/24")

  ip.a?
    # => true



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# File 'lib/ipaddress/ipv4.rb', line 114

def self.is_class_a(my)
  # console.log("is_class_a:", my.to_string(), Crunchy.from_string("80000000", 16), my.is_ipv4());
  return my.is_ipv4() && my.host_address.lt(Crunchy.from_string("80000000", 16))
end

.is_class_b(my) ⇒ Object

Checks whether the ip address belongs to a

RFC 791 CLASS B network, no matter
what the subnet mask is.

Example:

  ip = IPAddress("172.16.10.1/24")

  ip.b?
    # => true



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# File 'lib/ipaddress/ipv4.rb', line 130

def self.is_class_b(my)
  return my.is_ipv4() &&
    Crunchy.from_string("80000000", 16).lte(my.host_address) &&
    my.host_address.lt(Crunchy.from_string("c0000000", 16))
end

.is_class_c(my) ⇒ Object

Checks whether the ip address belongs to a

RFC 791 CLASS C network, no matter
what the subnet mask is.

Example:

  ip = IPAddress("192.168.1.1/30")

  ip.c?
    # => true



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# File 'lib/ipaddress/ipv4.rb', line 147

def self.is_class_c(my)
  return my.is_ipv4() &&
    Crunchy.from_string("c0000000", 16).lte(my.host_address) &&
    my.host_address.lt(Crunchy.from_string("e0000000", 16))
end

.parse_classful(ip_si) ⇒ Object

Creates a new IPv4 address object by parsing the

address in a classful way.

Classful addresses have a fixed netmask based on the
class they belong to:

* Class A, from 0.0.0.0 to 127.255.255.255
* Class B, from 128.0.0.0 to 191.255.255.255
* Class C, D and E, from 192.0.0.0 to 255.255.255.254

Example:

  ip = IPAddress::IPv4.parse_classful "10.0.0.1"

  ip.netmask
    # => "255.0.0.0"
  ip.a?
    # => true

Note that classes C, D and E will all have a default
prefix of /24 or 255.255.255.0



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# File 'lib/ipaddress/ipv4.rb', line 175

def self.parse_classful(ip_si)
  if (!IPAddress.is_valid_ipv4(ip_si))
    return nil
  end

  o_ip = IPAddress.parse(ip_si)
  if (o_ip.nil?)
    return o_ip
  end

  ip = o_ip
  if (Ipv4.is_class_a(ip))
    ip.prefix = Prefix32.create(8)
  elsif (Ipv4.is_class_b(ip))
    ip.prefix = Prefix32.create(16)
  elsif (Ipv4.is_class_c(ip))
    ip.prefix = Prefix32.create(24)
  end

  return ip
end

.parse_data(data) ⇒ Object 



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# File 'lib/ipaddress/ipv4.rb', line 11

def self.parse_data(data)
  ret = 0
  shift = 24
  data.unpack("C*")[0..4].each do |i|
    ret |= i << shift
    shift -= 8
  end

  Ipv4.from_number(Crunchy.from_number(ret), 32)
end

.to_ipv6(ia) ⇒ Object 



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# File 'lib/ipaddress/ipv4.rb', line 91

def self.to_ipv6(ia)
  return IPAddress.new({
    ip_bits: IpBits.v6(),
    host_address: ia.host_address.clone(),
    prefix: Prefix128.create(ia.prefix.num),
    mapped: nil,
    vt_is_private: ->(a) { Ipv6.ipv6_is_private(a) },
    vt_is_loopback: ->(a) { Ipv6.ipv6_is_loopback(a) },
    vt_to_ipv6: ->(a) { Ipv6.to_ipv6(a) }
  })
end