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util.ip: Simplify creation of IPv6-mapped IPv4 addresses

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This commit is contained in:
Kim Alvefur 2017-12-01 04:33:49 +01:00
parent 84da11d50e
commit 405739ef2f
1 changed files with 1 additions and 14 deletions
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15
util/ip.lua
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@ -155,22 +155,9 @@ local function precedence(ip)
end
end
local function toV4mapped(ip)
local fields = {};
local ret = "::ffff:";
ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
ret = ret .. ("%02x"):format(fields[1]);
ret = ret .. ("%02x"):format(fields[2]);
ret = ret .. ":"
ret = ret .. ("%02x"):format(fields[3]);
ret = ret .. ("%02x"):format(fields[4]);
return new_ip(ret, "IPv6");
end
function ip_methods:toV4mapped()
if self.proto ~= "IPv4" then return nil, "No IPv4 address" end
local value = toV4mapped(self.addr);
self.toV4mapped = value;
local value = new_ip("::ffff:" .. self.normal);
return value;
end