98 lines
3.9 KiB
CoffeeScript
98 lines
3.9 KiB
CoffeeScript
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long2ip = (long) ->
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a = (long & (0xff << 24)) >>> 24;
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b = (long & (0xff << 16)) >>> 16;
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c = (long & (0xff << 8)) >>> 8;
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d = long & 0xff;
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return [a, b, c, d].join('.')
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ip2long = (ip) ->
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b = (ip + '').split('.');
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if b.length is 0 or b.length > 4 then throw new Error('Invalid IP')
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for byte, i in b
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if isNaN parseInt(byte, 10) then throw new Error("Invalid byte: #{byte}")
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if byte < 0 or byte > 255 then throw new Error("Invalid byte: #{byte}")
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return ((b[0] or 0) << 24 | (b[1] or 0) << 16 | (b[2] or 0) << 8 | (b[3] or 0)) >>> 0
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class Netmask
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constructor: (net, mask) ->
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throw new Error("Missing `net' parameter") unless typeof net is 'string'
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unless mask
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# try to find the mask in the net (i.e.: 1.2.3.4/24 or 1.2.3.4/255.255.255.0)
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[net, mask] = net.split('/', 2)
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unless mask
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switch net.split('.').length
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when 1 then mask = 8
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when 2 then mask = 16
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when 3 then mask = 24
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when 4 then mask = 32
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else throw new Error("Invalid net address: #{net}")
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if typeof mask is 'string' and mask.indexOf('.') > -1
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# Compute bitmask, the netmask as a number of bits in the network portion of the address for this block (eg.: 24)
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try
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@maskLong = ip2long(mask)
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catch error
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throw new Error("Invalid mask: #{mask}")
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for i in [32..0]
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if @maskLong == (0xffffffff << (32 - i)) >>> 0
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@bitmask = i
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break
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else if mask
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# The mask was passed as bitmask, compute the mask as long from it
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@bitmask = parseInt(mask, 10)
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@maskLong = 0
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if @bitmask > 0
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@maskLong = (0xffffffff << (32 - @bitmask)) >>> 0
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else
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throw new Error("Invalid mask: empty")
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try
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@netLong = (ip2long(net) & @maskLong) >>> 0
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catch error
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throw new Error("Invalid net address: #{net}")
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throw new Error("Invalid mask for ip4: #{mask}") unless @bitmask <= 32
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# The number of IP address in the block (eg.: 254)
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@size = Math.pow(2, 32 - @bitmask)
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# The address of the network block as a string (eg.: 216.240.32.0)
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@base = long2ip(@netLong)
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# The netmask as a string (eg.: 255.255.255.0)
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@mask = long2ip(@maskLong)
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# The host mask, the opposite of the netmask (eg.: 0.0.0.255)
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@hostmask = long2ip(~@maskLong)
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# The first usable address of the block
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@first = if @bitmask <= 30 then long2ip(@netLong + 1) else @base
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# The last usable address of the block
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@last = if @bitmask <= 30 then long2ip(@netLong + @size - 2) else long2ip(@netLong + @size - 1)
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# The block's broadcast address: the last address of the block (eg.: 192.168.1.255)
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@broadcast = if @bitmask <= 30 then long2ip(@netLong + @size - 1)
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# Returns true if the given ip or netmask is contained in the block
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contains: (ip) ->
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if typeof ip is 'string' and (ip.indexOf('/') > 0 or ip.split('.').length isnt 4)
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ip = new Netmask(ip)
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if ip instanceof Netmask
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return @contains(ip.base) and @contains((ip.broadcast || ip.last))
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else
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return (ip2long(ip) & @maskLong) >>> 0 == ((@netLong & @maskLong)) >>> 0
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# Returns the Netmask object for the block which follow this one
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next: (count=1) ->
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return new Netmask(long2ip(@netLong + (@size * count)), @mask)
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forEach: (fn) ->
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range = [ip2long(@first)..ip2long(@last)]
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fn long2ip(long), long, index for long, index in range
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# Returns the complete netmask formatted as `base/bitmask`
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toString: ->
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return @base + "/" + @bitmask
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exports.ip2long = ip2long
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exports.long2ip = long2ip
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exports.Netmask = Netmask
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