mirror of https://github.com/aredn/aredn.git
90 lines
2.6 KiB
Lua
Executable File
90 lines
2.6 KiB
Lua
Executable File
#!/usr/bin/lua
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--[[
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Part of AREDN® -- Used for creating Amateur Radio Emergency Data Networks
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Copyright (C) 2023 Tim Wilkinson
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See Contributors file for additional contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation version 3 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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Additional Terms:
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Additional use restrictions exist on the AREDN® trademark and logo.
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See AREDNLicense.txt for more info.
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Attributions to the AREDN® Project must be retained in the source code.
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If importing this code into a new or existing project attribution
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to the AREDN® project must be added to the source code.
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You must not misrepresent the origin of the material contained within.
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Modified versions must be modified to attribute to the original source
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and be marked in reasonable ways as differentiate it from the original
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version
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--]]
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require("uci")
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require("aredn.olsr")
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local dns_file = "/tmp/dnsmasq.d/supernode.conf"
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local c = uci.cursor()
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-- Supernodes themselves dont need supernode nameservers
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if c:get("aredn", "@supernode[0]", "enable") == "1" then
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os.exit(0)
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end
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-- Ignore supernodes?
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if c:get("aredn", "@supernode[0]", "support") == "0" then
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os.exit(0)
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end
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-- Find the closest supernode to use as a nameserver
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local sn = {}
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for _, hna in ipairs(aredn.olsr.getOLSRHNA())
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do
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if hna.genmask == 8 and hna.destination == "10.0.0.0" then
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sn[hna.gateway] = true
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break
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end
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end
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local best = { destination = nil, etx = 99999999 }
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for _, route in ipairs(aredn.olsr.getOLSRRoutes())
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do
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if sn[route.destination] and route.etx < best.etx then
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best = route
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end
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end
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if not best.destination then
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os.exit(0)
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end
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-- Update the dns and restart network if necessary
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local dns = "#" .. best.destination .. "\nserver=/local.mesh/" .. best.destination .. "\nrev-server=10.0.0.0/8," ..best.destination .. "\nrev-server=172.31.0.0/16," .. best.destination .. "\nrev-server=172.30.0.0/16," .. best.destination .. "\n"
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local odns = ""
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local f = io.open(dns_file)
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if f then
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odns = f:read("*a")
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f:close()
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end
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if odns ~= dns then
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f = io.open(dns_file, "w+")
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if f then
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f:write(dns)
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f:close()
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os.execute("/etc/init.d/dnsmasq restart")
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end
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end
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