Class: IP::V4

Inherits:

IP

• Object
• IP
• IP::V4

Defined in:

lib/ip/base.rb,
lib/ip/socket.rb

Constant Summary

PROTO =

"v4".freeze

ADDR_BITS =

32

MASK =

(1 << ADDR_BITS) - 1

AF =

Socket::AF_INET

Constants inherited from IP

PROTO_TO_CLASS

Instance Attribute Summary

Attributes inherited from IP

#ctx, #pfxlen

Class Method Summary

• .parse(str) ⇒ Object

  Parse a string; return an V4 instance if it’s a valid IPv4 address, nil otherwise.

Instance Method Summary

• #to_addr ⇒ Object

  Return just the address part as a String in dotted decimal form.

• #to_arpa ⇒ Object

  return the arpa version of the address for reverse DNS: en.wikipedia.org/wiki/Reverse_DNS_lookup.

Methods inherited from IP

#&, #+, #-, #<=>, #^, #af, #broadcast, #divide_by_hosts, #divide_by_subnets, #eql?, #freeze, from_cpal, #hash, #initialize, #inspect, #ipv4_compat?, #ipv4_mapped?, #is_in?, #mask, #mask!, #native, #netmask, #network, #offset, #offset?, orig_new, #proto, #reset_pfxlen!, #size, #split, #succ, #succ!, #to_a, #to_addrlen, #to_ah, #to_b, #to_cpal, #to_cphl, #to_hex, #to_i, #to_irange, #to_range, #to_s, #to_sockaddr, #wildmask, #|, #~

Constructor Details

This class inherits a constructor from IP

Class Method Details

.parse(str) ⇒ Object

Parse a string; return an V4 instance if it’s a valid IPv4 address, nil otherwise

# File 'lib/ip/base.rb', line 325

def self.parse(str)
  if str =~ /\A(\d+)\.(\d+)\.(\d+)\.(\d+)(?:\/(\d+))?(?:@(.*))?\z/
    pfxlen = ($5 || ADDR_BITS).to_i
    return nil if pfxlen > 32
    addrs = [$1.to_i, $2.to_i, $3.to_i, $4.to_i]
    return nil if addrs.find { |n| n>255 }
    addr = (((((addrs[0] << 8) | addrs[1]) << 8) | addrs[2]) << 8) | addrs[3]
    new(addr, pfxlen, $6)
  end
end

Instance Method Details

#to_addr ⇒ Object

Return just the address part as a String in dotted decimal form

# File 'lib/ip/base.rb', line 337

def to_addr
  sprintf("%d.%d.%d.%d",
    (@addr>>24)&0xff, (@addr>>16)&0xff, (@addr>>8)&0xff, @addr&0xff)
end

#to_arpa ⇒ Object

return the arpa version of the address for reverse DNS: en.wikipedia.org/wiki/Reverse_DNS_lookup

# File 'lib/ip/base.rb', line 342

def to_arpa
  sprintf("%d.%d.%d.%d.in-addr.arpa.",
    @addr&0xff, (@addr>>8)&0xff, (@addr>>16)&0xff,(@addr>>24)&0xff)
end