/* Technische Informationen */ ein verweis auf den quellcode ist ja jetzt möglich, oder?
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@ -109,209 +109,13 @@ Ideen dazu werden [[Diskussion:Freifunk Dresden|diskutiert]], um die jetzigen Be
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== Technische Informationen ==
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Bitte konsultiert zuerst das [http://wiki.freifunk-dresden.de/ Wiki Freifunk Dresden] und
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[http://wiki.freifunk-dresden.de/index.php/Knoten_Spezifikation Knoten Spezifikationen] für aktuelle Informationen,
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Derzeit enthält es noch keine techischen Informationen (ist aber in Arbeit).
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<font color="red">Die Informationen hier in diesem Wiki sind derzeit veraltet und sind nicht mehr kompatibel mit dem Freifunk Dresden Netz. Sie sollten daher
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nicht mehr verwendet werden, da es damit zu IP Konflikten kommt.</font>
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Grundsätzlich soll das [http://wiki.freifunk-dresden.de/ Wiki Freifunk Dresden] Informationen, insbesondere auch technische Informationen, bereitstellen. Das ist wohl aber noch nicht der Fall und soll wohl in Arbeit sein.
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=== WLAN-Einstellungen ===
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=== Quellcode ===
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Die detailierten Einstellungen werden [[Intern:Freifunk Dresden|derzeit intern]] beschrieben.
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Der Quellcode soll auf [[#GitHub]] verfügbar sein. Dies gilt insbesondere für die [[#Firmware]].<ref>https://github.com/ddmesh/firmware-freifunk-dresden</ref>
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=== Adressvergabe ===
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==== IP-Adressberechnungs mit Shell- und Lua Script ====
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Die Berechnung kann sich in künftigen Versionen ändern, derzeit wird u.a. eine Aufteilung des Netzwerkes in "original"-FFF und "custom" erwogen. Deshalb ist Vorsicht geboten was die Aktualität des Inhaltes angeht - bitte überprüfen bevor ihr peert.
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Die Scripte deren Algorithmus formalisiert werden soll:
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===== usr/bin/ddmesh-ipcalc.sh =====
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<source lang="bash">
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#!/bin/sh
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if [ "$1" = "" ]
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then
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echo ""
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echo "ddmesh-ipcalc.sh (lua) Stephan Enderlein (c) 2013 V1.7"
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echo ""
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echo "Calculates all the addresses for the ddmesh freifunk node"
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echo "usage: ddmesh-ipcalc.sh [-n node] | [ip]"
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echo ""
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exit 1
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fi
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if [ "$1" = "-n" ]; then
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node=`echo "$2" | sed 's/[\$\`\(\)]/0/g'`
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lua -lddmesh -e "ipcalc.print($node)"
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else
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ip=`echo "$1" | sed 's/[\$\`\(\)]/0/g'`
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lua -lddmesh -e "print(iplookup(\"$ip\"))"
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fi
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</source>
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===== usr/lib/lua/ddmesh.lua =====
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<source lang="lua">
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--[[----------------------------------------------------------------------------------------
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ddmesh.lua
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library for different freifunk functions
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version: 6
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-------------------------------------------------------------------------------------------]]
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----------------- ipcalc ---------------
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ipcalc={}
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ipcalc.data={}
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ipcalc.data.max=2048
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function split(str, delim, maxNb)
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-- Eliminate bad cases...
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if string.find(str, delim) == nil then
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return { str }
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end
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if maxNb == nil or maxNb < 1 then
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maxNb = 0 -- No limit
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end
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local result = {}
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local pat = "(.-)" .. delim .. "()"
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local nb = 0
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local lastPos
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for part, pos in string.gfind(str, pat) do
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nb = nb + 1
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result[nb] = part
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lastPos = pos
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if nb == maxNb then break end
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end
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-- Handle the last field
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if nb ~= maxNb then
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result[nb + 1] = string.sub(str, lastPos)
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end
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return result
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end
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function ipcalc.rCalcIp(ip)
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if ip==nil or ip=="" then return -1 end
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a = split(ip, "[.]")
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if #a ~= 4 then return -1 end
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if a[1]==nil or a[1]=="" or tonumber(a[1]) ~= 10 then return -1 end
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if a[2]==nil or a[2]=="" or tonumber(a[2]) ~= 200 and tonumber(a[2]) ~= 201 then return -1 end
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if a[3]==nil or a[3]=="" or tonumber(a[3]) < 0 or tonumber(a[3]) > 255 then return -1 end
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if a[4]==nil or a[4]=="" or tonumber(a[4]) < 0 or tonumber(a[4]) > 255 then return -1 end
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middle = a[3]
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if a[2]=="201" then middle = middle + 256 end
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minor = math.floor(a[4]/64) --x>>6
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node = middle*4+minor --x<<2
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if node < 0 or node > ipcalc.data.max then return -1 end
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return node
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end
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function ipcalc.calc(node)
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--node has to be a number n \in N_0, 0 <= n <= 2048
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if node==nil or node=="" then return -1 end
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node=tonumber(node)
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if node==nil or node=="" then return -1 end
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if node < 0 or node > ipcalc.data.max then return -1 end
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local domain = "freifunk-dresden.de"
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--Ternary Operator in use
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-- major network for nodes n < 1024: 200, for nodes > 1023: 201
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local major = node >= 1024 and 201 or 200 --a[2]
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-- etc.
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local middle = node >= 1024 and math.floor((node-1024) / 4) or math.floor(node / 4) --a[3]
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local minor = (node % 4) * 64
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local meshnet = "10"
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local nodeip = meshnet .. "." .. major .. "." .. middle .. "." .. minor + 1
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local meshnetmask = "255.0.0.0"
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local meshpre = 15
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local meshbroadcast = "10.255.255.255"
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local meshnetwork = "10.200.0.0"
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local dhcpstart = meshnet .. "." .. major .. "." .. middle .. "." .. minor + 2
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local dhcpend = meshnet .. "." .. major .. "." .. middle .. "." .. minor + 63
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local dhcpoffset = 1 --used by config/dhcp
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local dhcplimit = 62 --used by config/dhcp
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local dhcprangepre = 26
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local dhcprangemask = "255.255.255.192"
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local dhcpnetmask = "255.255.255.255"
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local dhcpbroadcast = "10.255.255.255" -- needed, else dnsmasq will not start
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local dhcpnetwork = meshnet .. "." .. major .. "." .. middle .. "." .. minor
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local hna = meshnet .. "." .. major .. "." .. middle .. "." .. minor .. "/" .. dhcprangepre
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local mesh6pre = "48"
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local mesh6net = "fd11:11ae:7466::"
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-- client range
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local mesh6nodenet= "fd11:11ae:7466:" .. string.format("%x", node) .. "::"
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local mesh6ip = mesh6nodenet .. "1"
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local mesh6nodepre= "64"
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-- preparing variabled to be expoted
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ipcalc.data.node = node
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ipcalc.data.domain = domain
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ipcalc.data.hostname = "r" .. node
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ipcalc.data.ip = nodeip
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ipcalc.data.network = meshnetwork
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ipcalc.data.netpre = meshpre
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ipcalc.data.netmask = meshnetmask
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ipcalc.data.broadcast = meshbroadcast
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ipcalc.data.dhcpstart = dhcpstart
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ipcalc.data.dhcpend = dhcpend
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ipcalc.data.dhcpoffset = dhcpoffset
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ipcalc.data.dhcplimit = dhcplimit
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ipcalc.data.dhcprangepre = dhcprangepre
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ipcalc.data.dhcprangemask = dhcprangemask
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ipcalc.data.dhcpnetwork = dhcpnetwork
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ipcalc.data.dhcpbroadcast = dhcpbroadcast
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ipcalc.data.dhcpnetmask = dhcpnetmask
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ipcalc.data.clienthna = hna
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ipcalc.data.mesh6ip = mesh6ip
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ipcalc.data.mesh6net = mesh6net
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ipcalc.data.mesh6pre = mesh6pre
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ipcalc.data.mesh6nodenet = mesh6nodenet
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ipcalc.data.mesh6nodepre = mesh6nodepre
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end
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function ipcalc.print(node)
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if node==nil or node=="" then print("ERROR"); return -1 end
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node=tonumber(node)
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if node==nil then print("ERROR"); return -1 end
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if node < 0 or node > ipcalc.data.max then return -1 end
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ipcalc.calc(node)
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for k,v in pairs(ipcalc.data) do
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print("export _ddmesh_"..k.."="..v)
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end
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end
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--not needed for ip address calculation
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function iplookup(ip)
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if ip==nil then return -1 end
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n=ipcalc.rCalcIp(ip)
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if n == -1 then return -1 end
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ipcalc.calc(n)
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return ipcalc.data.hostname
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end
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--not needed for ip address calculation
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function lookup(node)
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if node==nil then return -1 end
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if string.sub(node,1,1) == "r" then
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n=tonumber(string.sub(node,2))
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else
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n=tonumber(node)
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end
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if n==nil then return -1 end
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if n < 0 or n > ipcalc.data.max then return -1 end
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ipcalc.calc(n)
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return ipcalc.data.ip
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end
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</source>
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----
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=== mögliche Probleme beim Betrieb der Technik ===
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== Metadaten ==
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