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// shunt - configuration
//
// Turns UCI shaped sections into the structures the other modules consume.
// load() reads UCI, parse() is pure and fed literals by the tests.
//
// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright (c) 2026 Dirk Brenken <dev@brenken.org>
export const DEFAULTS = {
enabled: true,
poll_interval: 300,
entry_ttl: 1200,
snoop: true,
snoop_devices: [ 'br-lan' ],
debug: false,
rp_filter_manage: false
};
export const MIN = {
poll_interval: 30,
entry_ttl: 60
};
function to_bool(v, dflt) {
if (v == null)
return dflt;
if (v === true || v === false)
return v;
if (v == '1' || v == 1)
return true;
if (v == '0' || v == 0)
return false;
return null;
}
function uniq(list) {
let seen = {};
let out = [];
for (let v in list) {
if (!seen[v]) {
seen[v] = true;
push(out, v);
}
}
return out;
}
function to_list(v) {
if (v == null)
return [];
if (type(v) == 'array')
return v;
return [ v ];
}
// require('uci') sits inside so the module stays importable without it, and
// parse() stays pure for the tests.
export function load() {
let uci;
try {
uci = require('uci');
}
catch (e) {
return null;
}
let sections = [];
uci.cursor().foreach('shunt', null, (s) => {
let values = {};
for (let k in s)
if (substr(k, 0, 1) != '.')
values[k] = s[k];
push(sections, { type: s['.type'], name: s['.name'], values });
});
return sections;
};
export function parse(sections) {
let g = { ...DEFAULTS };
let policies = [], issues = [];
function reject(section, option, reason) {
push(issues, { section, option, reason });
}
function num_opt(section, values, key) {
let v = values[key];
if (v == null)
return;
let n = +v;
if (type(v) == 'string' && match(v, /^[0-9]+$/) == null || n != n) {
reject(section, key, sprintf('not a number: %J, default %d kept',
v, g[key]));
return;
}
if (n < MIN[key]) {
reject(section, key, sprintf('%d below minimum, clamped to %d',
n, MIN[key]));
n = MIN[key];
}
g[key] = n;
}
function bool_opt(section, values, key) {
let b = to_bool(values[key], g[key]);
if (b === null) {
reject(section, key, sprintf('not a boolean: %J, default kept',
values[key]));
return;
}
g[key] = b;
}
for (let s in (sections ?? [])) {
if (s?.type == 'global') {
let v = s.values ?? {};
bool_opt(s.name ?? 'global', v, 'enabled');
bool_opt(s.name ?? 'global', v, 'snoop');
bool_opt(s.name ?? 'global', v, 'debug');
bool_opt(s.name ?? 'global', v, 'rp_filter_manage');
num_opt(s.name ?? 'global', v, 'poll_interval');
num_opt(s.name ?? 'global', v, 'entry_ttl');
if (v.snoop_device != null) {
let devs = [];
for (let d in to_list(v.snoop_device)) {
if (type(d) == 'string' && length(d))
push(devs, d);
else
reject(s.name ?? 'global', 'snoop_device',
sprintf('not a device name: %J, entry dropped', d));
}
if (length(devs))
g.snoop_devices = uniq(devs);
else
reject(s.name ?? 'global', 'snoop_device',
'no usable device, default kept');
}
continue;
}
if (s?.type != 'policy')
continue;
let v = s.values ?? {};
if (to_bool(v.enabled, true) !== true)
continue;
push(policies, {
name: s.name,
interface: v.interface,
fallback: v.fallback,
gw4: v.gw4,
gw6: v.gw6,
src: to_list(v.src),
src_mac: to_list(v.src_mac),
dport: to_list(v.dport),
proto: to_list(v.proto),
dst: to_list(v.dst),
domains: to_list(v.domain)
});
}
return { global: g, policies, issues };
};
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