Add UI-controlled TProxy bypass for devices

src/server/tproxySourceBypass.js

@@ -0,0 +1,75 @@
+import { spawnSync } from "node:child_process";
+import { settings } from "./config.js";
+import { deviceCidrs, normalizeCidr } from "./devices.js";
+
+function splitCidrs(value) {
+  return String(value || "")
+    .split(/[\s,]+/)
+    .map((item) => normalizeCidr(item))
+    .filter(Boolean);
+}
+
+function unique(list) {
+  return [...new Set(list)];
+}
+
+export function sourceBypassCidrs(
+  profiles,
+  envCidrs = process.env.TPROXY_BYPASS_SOURCE_CIDRS || "",
+) {
+  return unique([
+    ...splitCidrs(envCidrs),
+    ...deviceCidrs(profiles?.devices || [], "bypass"),
+  ]);
+}
+
+export function buildSourceBypassIptablesCommands(
+  cidrs,
+  { chain = settings.tproxySourceBypassChain } = {},
+) {
+  return [
+    ["-w", "-t", "mangle", "-F", chain],
+    ...cidrs.map((cidr) => [
+      "-w",
+      "-t",
+      "mangle",
+      "-A",
+      chain,
+      "-s",
+      cidr,
+      "-j",
+      "ACCEPT",
+    ]),
+  ];
+}
+
+export function syncTproxySourceBypass(profiles, options = {}) {
+  if (settings.appMode !== "gateway") {
+    return { success: true, skipped: true, cidrs: [] };
+  }
+
+  const chain = options.chain || settings.tproxySourceBypassChain;
+  const cidrs = sourceBypassCidrs(
+    profiles,
+    options.envCidrs ?? process.env.TPROXY_BYPASS_SOURCE_CIDRS,
+  );
+  const commands = buildSourceBypassIptablesCommands(cidrs, { chain });
+
+  for (const args of commands) {
+    const result = spawnSync("iptables", args, {
+      encoding: "utf8",
+      timeout: 1000,
+    });
+    if (result.error || result.status !== 0) {
+      return {
+        success: false,
+        cidrs,
+        error:
+          result.error?.message ||
+          (result.stderr || result.stdout || "iptables command failed").trim(),
+      };
+    }
+  }
+
+  return { success: true, cidrs };
+}