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-- SPDX-License-Identifier: GPL-3.0-or-later
local upg_dir = '@systemd_work_dir@/.upgrade-4-to-5'
local out = upg_dir..'/kresd.conf.net'
local sockets = {
{ file='kresd.socket', kind='dns' },
{ file='kresd-tls.socket', kind='tls' },
{ file='kresd-doh.socket', kind='doh2' },
{ file='kresd-webmgmt.socket', kind='webmgmt' },
}
-- globals
addr_port = {}
outfile = io.open(out, 'w')
if outfile == nil then
-- this is technically an error, but upgrade script shouldn't fail in scriptlets
os.exit(0) -- make no changes and exit
end
outfile:write("-- Suggested network interface configuration\n")
outfile:write("-- See https://knot-resolver.readthedocs.io/en/stable/upgrading.html\n\n")
outfile:write("-- Please remove any unused or undesired interfaces and add them to\n")
outfile:write("-- @etc_dir@/kresd.conf\n\n")
local function write_net_listen(addr, port, kind)
-- make sure (addr, port) combination is unique
for _, val in ipairs(addr_port) do
if val.addr == addr and val.port == port then
return
end
end
table.insert(addr_port, { addr=addr, port=port })
outfile:write(
"net.listen('"..addr.."', "..tostring(port)..
", { kind = '"..kind.."', freebind = true })\n")
end
local function convert(line, kind, ipv6only)
local patterns = {
'^[^=]+=(%d+%.%d+%.%d+%.%d+):(%d+)', -- IPv4
'^[^=]+=%[([^%]]+)%]:(%d+)', -- IPv6
'^[^=]+=(/.*)', -- UNIX
}
-- Datagram is either implied (dns) or unsupported (tls/doh/webmgmt)
if not line:match('^Listen.*Stream') then
return
end
for _, pattern in ipairs(patterns) do
local addr, port = line:match(pattern)
if addr ~= nil then
write_net_listen(addr, port, kind)
if not ipv6only then
if addr:match('^::$') then
write_net_listen('0.0.0.0', port, kind)
end
if addr:match('^::1$') then
write_net_listen('127.0.0.1', port, kind)
end
end
end
end
return
end
for _, socket in pairs(sockets) do
local ipv6only = false
local ipv6only_f = io.open(upg_dir..'/'..socket.file..'.v6only', 'r')
if ipv6only_f ~= nil then
ipv6only = true
io.close(ipv6only_f)
end
local sockinfo = io.open(upg_dir..'/'..socket.file, 'r')
if sockinfo ~= nil then
for line in sockinfo:lines() do
convert(line, socket.kind, ipv6only)
end
end
end
outfile:write("\n")
io.close(outfile)
os.exit(0)
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