1 | class IPAddr
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2 | # @family is either AF_INET or AF_INET6.
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3 | # @addr is a String represents IP address as an octet string.
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4 | # @mask is a String represents netmask as an octet string.
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5 |
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6 | def initialize(addr='::', family=Socket::AF_UNSPEC)
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7 | a, m = addr.split('/', 2)
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8 | if family == Socket::AF_UNSPEC
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9 | begin
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10 | @addr = IPSocket.pton(Socket::AF_INET, a)
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11 | @family = Socket::AF_INET
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12 | rescue ArgumentError
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13 | @addr = IPSocket.pton(Socket::AF_INET6, a)
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14 | @family = Socket::AF_INET6
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15 | end
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16 | else
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17 | @addr = IPSocket.pton(family, a)
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18 | @family = family
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19 | end
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20 | if m
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21 | initialize_makemask(m)
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22 | _applymask
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23 | else
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24 | if @family == Socket::AF_INET
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25 | @mask = "\xff" * 4
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26 | elsif @family == Socket::AF_INET6
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27 | @mask = "\xff" * 16
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28 | end
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29 | end
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30 | end
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31 |
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32 | def initialize_makemask(m)
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33 | if @family == Socket::AF_INET and m.include?('.')
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34 | @mask = IPSocket.pton(Socket::AF_INET, m)
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35 | elsif @family == Socket::AF_INET6 and m.include?(':')
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36 | @mask = IPSocket.pton(Socket::AF_INET6, m)
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37 | else
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38 | ma = []
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39 | mi = m.to_i
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40 | mlen = (ipv4?) ? 32 : 128
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41 | while mlen > 0
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42 | if mi >= 8
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43 | ma << 0xff
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44 | elsif mi <= 0
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45 | ma << 0
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46 | else
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47 | ma << (0xff ^ (0xff >> mi))
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48 | end
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49 | mi -= 8
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50 | mlen -= 8
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51 | end
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52 | @mask = ma.pack("C*")
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53 | end
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54 | end
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55 |
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56 | def self.new_ntoh(addr)
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57 | raise TypeError, "can't convert to String" unless addr.is_a? String
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58 | if addr.size == 4
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59 | a = IPAddr.new("0.0.0.0")
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60 | f = Socket::AF_INET
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61 | elsif addr.size == 16
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62 | a = IPAddr.new("::")
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63 | f = Socket::AF_INET6
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64 | else
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65 | raise ArgumentError, "length of addr must be 4 or 16"
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66 | end
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67 | a.set2(addr, f)
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68 | end
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69 |
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70 | # private
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71 | def _applymask
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72 | a = @addr.unpack("C*")
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73 | m = @mask.unpack("C*")
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74 | (0...a.size).each { |i| a[i] &= m[i] }
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75 | @addr = a.pack("C*")
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76 | end
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77 |
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78 | # private
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79 | def _mask
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80 | @mask
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81 | end
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82 |
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83 | #def &(other)
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84 | #def <<(num)
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85 |
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86 | def <=>(other)
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87 | if @family == other.family
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88 | @addr <=> other.hton
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89 | else
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90 | nil
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91 | end
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92 | end
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93 |
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94 | def ==(other)
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95 | if other.is_a? String
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96 | self.eql? IPAddr.new(other)
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97 | else
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98 | self.eql? other
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99 | end
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100 | end
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101 |
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102 | #def ===(ipaddr)
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103 | #alias include? ===
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104 | #def >>(num)
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105 |
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106 | def eql?(other)
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107 | @addr == other.hton and @mask == other._mask and @family == other.family
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108 | end
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109 |
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110 | def family
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111 | @family
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112 | end
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113 |
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114 | def hash
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115 | @addr.hash ^ @mask.hash ^ @family.hash
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116 | end
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117 |
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118 | def hton
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119 | @addr
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120 | end
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121 |
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122 | def inspect
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123 | def a2s(a)
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124 | if @family == Socket::AF_INET
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125 | return a.unpack("C*").map { |b| format("%u", b) }.join('.')
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126 | else
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127 | bytes = a.unpack("C*").map { |x| format "%02x", x }
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128 | return (0..7).map { |i| bytes[i*2, 2].join }.join(':')
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129 | end
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130 | end
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131 | format "#<%s: %s:%s/%s>",
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132 | self.class, (ipv4? ? 'IPv4' : 'IPv6'), a2s(@addr), a2s(@mask)
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133 | end
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134 |
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135 | def ipv4?
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136 | @family == Socket::AF_INET
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137 | end
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138 |
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139 | def ipv6?
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140 | @family == Socket::AF_INET6
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141 | end
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142 |
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143 | def mask(prefixlen)
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144 | a = @addr.unpack("C*")
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145 | i = prefixlen.divmod(8)[0] # mruby 1.0.0 lacks Integer#div
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146 | if prefixlen % 8 != 0
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147 | a[i] &= ~(0xff >> (prefixlen % 8))
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148 | i += 1
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149 | end
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150 | (i..a.size-1).each { |i| a[i] = 0 }
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151 | IPAddr.new('::', Socket::AF_INET6).set2(a.pack("C*"), @family)
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152 | end
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153 |
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154 | # private
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155 | def set2(a, f)
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156 | @addr = a
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157 | @family = f
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158 | if @family == Socket::AF_INET
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159 | @mask = "\xff" * 4
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160 | elsif @family == Socket::AF_INET6
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161 | @mask = "\xff" * 16
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162 | end
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163 | self
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164 | end
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165 |
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166 | def to_s
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167 | IPAddr.ntop(@addr)
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168 | end
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169 |
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170 | def ~
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171 | a = @addr.unpack("C*").map { |b| b ^ 0xff }.pack("C*")
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172 | IPAddr.new('::', Socket::AF_INET6).set2(a, @family)
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173 | end
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174 |
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175 | alias to_string to_s
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176 |
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177 | # mruby extension
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178 | def is_netaddr?(prefixlen)
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179 | (self <=> self.mask(prefixlen)) == 0
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180 | end
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181 |
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182 | def is_bcastaddr?(prefixlen)
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183 | i = ~self
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184 | (i <=> i.mask(prefixlen)) == 0
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185 | end
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186 | end
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