Runtime error when IPv6 log client

[thelittlefireman]

hi,

I've got a nil issue when bouncer is using a nginx log which contains an ipv6.

2020/12/28 21:59:25 [error] 9518#9518: *80 lua entry thread aborted: runtime error: /usr/local/lib/lua/crowdsec/CrowdSec.lua:18: attempt to perform arithmetic on local 'o1' (a nil value)#012stack traceback:#012coroutine 0:#012#011/usr/local/lib/lua/crowdsec/CrowdSec.lua: in function 'ipToInt'#012#011/usr/local/lib/lua/crowdsec/CrowdSec.lua:70: in function 'allowIp'#012#011access_by_lua(main-lua.conf:166):105: in main chunk, client: 2a01:e0a:169:7f90::d73a:9b9d, server: nextcloud.mydomain, request: "PROPFIND /remote.php/dav/files/user/ HTTP/1.1", host: "nextcloud.mydomain"

original nginx log :

==> /var/log/access.log <==
2a01:e0a:169:7f90::d73a:9b9d - user nextcloud.mydomain [28/Dec/2020:21:59:25 +0100] "PROPFIND /remote.php/dav/files/user/ HTTP/1.1" 500 170 "-" "Mozilla/5.0 (Linux) mirall/3.1.1-20201225.075704.75c329f4f-1.0~groovy1 (Nextcloud)"

[thelittlefireman]

solution

function ipv6toInt ( str )
    local o1,o2,o3,o4,o5,o5,o6,o7,o8 = str:match("(%w+):(%w+):(%w+):(%w+):(%w+):(%w+):(%w+):(%w+)" )
    print (o1)
    local num = 0
    if o1 ~= nil then
        num=num+2^56*tonumber(o1,16)
    end
    if o2 ~= nil then
        num=num+2^48*tonumber(o2,16)
    end
    if o3 ~= nil then
        num=num+2^40*tonumber(o3,16)
    end
    if o4 ~= nil then
        num=num+2^32*tonumber(o4,16)
    end
    if o5 ~= nil then
        num=num+2^24*tonumber(o5,16)
    end
    if o6 ~= nil then
        num=num+2^16*tonumber(o6,16)
    end
    if o7 ~= nil then
        num=num+2^8*tonumber(o7,16)
    end
    if o8 ~= nil then
        num=num+tonumber(o8,16)
    end
    return num
end

function ipToInt( str )
	local num = 0
	if str and type(str)=="string" then
                if str:find(".", 4,true) then
		            local o1,o2,o3,o4 = str:match("(%d+)%.(%d+)%.(%d+)%.(%d+)" )
		            num = 2^24*o1 + 2^16*o2 + 2^8*o3 + o4
                else
                    num = ipv6toInt (str)
                end
	end
    return num
end


print(ipToInt("2a01:e0a:169:7f90::d73a:9b9d"))
print(ipToInt("0000:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF"))
print(ipToInt("0.0.3.0"))

[thelittlefireman]

wrong test