WIP netiquette

1 files changed, 53 insertions, 0 deletions

diff --git a/docker/netiquette/src/injector/iptables.mjs b/docker/netiquette/src/injector/iptables.mjs
new file mode 100644
index 0000000..584b560
--- /dev/null
+++ b/docker/netiquette/src/injector/iptables.mjs
@@ -0,0 +1,53 @@
+'use strict'
+
+let l;
+export default l = async (path, readFile, exec, log) => {
+
+  const load_static_rules = async path => 
+    (await readFile(path, 'utf-8'))
+      .split('\n')
+      .filter(e => e)
+
+  const get_current_rules = async () => 
+    (await exec('iptables -S INPUT'))
+      .stdout
+      .split('\n')
+      .filter(e => e.match(/^-A INPUT/g))
+
+  const compute_rules_to_add = (current, target) =>
+    target.filter(r => !current.includes(r))
+
+  const compute_rules_to_del = (current, target) =>
+    current
+      .filter(r => !target.includes(r))
+      .map(r => r.replace(/^-A INPUT/g, '-D INPUT'))
+
+  const update_rules = async (current, target) =>
+    await Promise.all([
+      ...compute_rules_to_del(current, target),
+      ...compute_rules_to_add(current, target)
+    ].map(r => exec(`iptables ${r}`)))
+
+  const build_target_rules = (tag_list) => 
+    tag_list
+      .map(t => /^public_port=(\d+)(-(\d+))?\/(udp|tcp)/g.exec(t))
+      .filter(t => t)
+      .map(t => new Object({ start: t[1], stop: t[3], protocol: t[4] }))
+      .map(t => t.stop
+        ? `-A INPUT -p ${t.protocol} --match multiport --dports ${t.start}:${t.stop} -j ACCEPT`
+        : `-A INPUT -p ${t.protocol} --dport ${t.start} -j ACCEPT`)
+
+  const do_log = (tag_list, r) => {
+    //log('[iptables]', tag_list)
+    log(`[iptables] ran ${r.length} commands`)
+  }
+  
+  const static_rules = path ? await load_static_rules(path) : []
+  log(`[iptables] initialized with ${static_rules.length} static rules`)
+  return async tag_list =>
+    do_log(
+      tag_list,
+      await update_rules(
+        await get_current_rules(),
+        [...static_rules, ...build_target_rules(tag_list)]))
+}