Initial commit

5 files changed, 100 insertions, 0 deletions

diff --git a/docker/tag-config/src/catalog/consul.mjs b/docker/tag-config/src/catalog/consul.mjs
new file mode 100644
index 0000000..655c61f
--- /dev/null
+++ b/docker/tag-config/src/catalog/consul.mjs
@@ -0,0 +1,30 @@
+'use strict'
+
+let l
+export default l = async (node, consul, log, notify) => {
+  const watch = consul.watch({ method: consul.catalog.node.services, options: {node: node}})
+
+  const extract_tags = data => 
+    data ? 
+      Object
+        .keys(data.Services)
+        .map(k => data.Services[k].Tags)
+        .reduce((acc, v) => [...acc, ...v], []) :
+      []
+
+  watch.on('error', err => {
+    console.error('error', err)
+  })
+
+  watch.on('change', async (data, res) => {
+    try {
+      const tags = extract_tags(data)
+      log(`[consul] new update, detected ${tags.length} tags`)
+      await notify(tags)
+    } catch(e) {
+      console.error('failed to notify target', e)
+    }
+  })
+  
+  log('[consul] initialized')
+}
diff --git a/docker/tag-config/src/injector/iptables.mjs b/docker/tag-config/src/injector/iptables.mjs
new file mode 100644
index 0000000..584b560
--- /dev/null
+++ b/docker/tag-config/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)]))
+}
diff --git a/docker/tag-config/src/injector/upnp.mjs b/docker/tag-config/src/injector/upnp.mjs
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/docker/tag-config/src/injector/upnp.mjs
diff --git a/docker/tag-config/src/io/files.mjs b/docker/tag-config/src/io/files.mjs
new file mode 100644
index 0000000..c3eca1b
--- /dev/null
+++ b/docker/tag-config/src/io/files.mjs
@@ -0,0 +1,8 @@
+'use strict'
+
+import fs from 'fs'
+
+export const readFile = (file, opts) => 
+  new Promise((resolve, reject) =>
+    fs.readFile(file, opts, (err, data) => 
+      err ? reject(err) : resolve(data)))
diff --git a/docker/tag-config/src/io/run.mjs b/docker/tag-config/src/io/run.mjs
new file mode 100644
index 0000000..8774043
--- /dev/null
+++ b/docker/tag-config/src/io/run.mjs
@@ -0,0 +1,9 @@
+'use strict'
+
+import child_process from 'child_process'
+
+export const exec = (cmd, opts) =>
+  new Promise((resolve, reject) =>
+    child_process.exec(cmd, opts, (error, stdout, stderr) =>
+      error ? reject({err: error, stdout: stdout, stderr: stderr}) : resolve({stdout: stdout, stderr: stderr})))
+