33 lines
724 B
Lua
33 lines
724 B
Lua
local M = {}
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local dns = require "dns"
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local dnsbls = {%DNSBL_LIST%}
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local ip = ngx.var.remote_addr
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function M.cached_ko ()
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return ngx.shared.dnsbl_cache:get(ip) == "ko"
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end
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function M.cached ()
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return ngx.shared.dnsbl_cache:get(ip) ~= nil
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end
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function M.check ()
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local rip = dns.ip_to_arpa()
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for k, v in ipairs(dnsbls) do
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local req = rip .. "." .. v
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local ips = dns.get_ips(req)
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for k2, v2 in ipairs(ips) do
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local a,b,c,d = v2:match("([%d]+).([%d]+).([%d]+).([%d]+)")
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if a == "127" then
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ngx.shared.dnsbl_cache:set(ip, "ko", 86400)
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ngx.log(ngx.NOTICE, "ip " .. ip .. " is in DNSBL " .. v)
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return true
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end
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end
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end
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ngx.shared.dnsbl_cache:set(ip, "ok", 86400)
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return false
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end
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return M
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