diff options
Diffstat (limited to 'util/ip.lua')
| -rw-r--r-- | util/ip.lua | 52 |
1 files changed, 50 insertions, 2 deletions
diff --git a/util/ip.lua b/util/ip.lua index 856bf034..62649c9b 100644 --- a/util/ip.lua +++ b/util/ip.lua @@ -12,7 +12,17 @@ local ip_mt = { __index = function (ip, key) return (ip_methods[key])(ip); end, local hex2bits = { ["0"] = "0000", ["1"] = "0001", ["2"] = "0010", ["3"] = "0011", ["4"] = "0100", ["5"] = "0101", ["6"] = "0110", ["7"] = "0111", ["8"] = "1000", ["9"] = "1001", ["A"] = "1010", ["B"] = "1011", ["C"] = "1100", ["D"] = "1101", ["E"] = "1110", ["F"] = "1111" }; local function new_ip(ipStr, proto) - if proto ~= "IPv4" and proto ~= "IPv6" then + if not proto then + local sep = ipStr:match("^%x+(.)"); + if sep == ":" or (not(sep) and ipStr:sub(1,1) == ":") then + proto = "IPv6" + elseif sep == "." then + proto = "IPv4" + end + if not proto then + return nil, "invalid address"; + end + elseif proto ~= "IPv4" and proto ~= "IPv6" then return nil, "invalid protocol"; end if proto == "IPv6" and ipStr:find('.', 1, true) then @@ -192,5 +202,43 @@ function ip_methods:scope() return value; end +function ip_methods:private() + local private = self.scope ~= 0xE; + if not private and self.proto == "IPv4" then + local ip = self.addr; + local fields = {}; + ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end); + if fields[1] == 127 or fields[1] == 10 or (fields[1] == 192 and fields[2] == 168) + or (fields[1] == 172 and (fields[2] >= 16 or fields[2] <= 32)) then + private = true; + end + end + self.private = private; + return private; +end + +local function parse_cidr(cidr) + local bits; + local ip_len = cidr:find("/", 1, true); + if ip_len then + bits = tonumber(cidr:sub(ip_len+1, -1)); + cidr = cidr:sub(1, ip_len-1); + end + return new_ip(cidr), bits; +end + +local function match(ipA, ipB, bits) + local common_bits = commonPrefixLength(ipA, ipB); + if not bits then + return ipA == ipB; + end + if bits and ipB.proto == "IPv4" then + common_bits = common_bits - 96; -- v6 mapped addresses always share these bits + end + return common_bits >= bits; +end + return {new_ip = new_ip, - commonPrefixLength = commonPrefixLength}; + commonPrefixLength = commonPrefixLength, + parse_cidr = parse_cidr, + match=match}; |