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therealaleph
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The val.town founder asked us not to promote using their service. This commit removes every val.town reference from the codebase and rewrites the exit-node guides to be platform-agnostic. Changes: - Renamed assets/exit_node/valtown.ts → assets/exit_node/exit_node.ts. TypeScript itself is unchanged — same web-standard Request/Response/ fetch API that runs on any serverless runtime. - Rewrote assets/exit_node/README.md and README.fa.md to recommend Deno Deploy as the primary host for users who want a free serverless TS endpoint, with fly.io and your-own-VPS as alternatives. CF Workers is explicitly called out as not-helpful (CF outbound is still on CF's flagged IP space). - Updated all val.town mentions in source comments (src/config.rs, src/domain_fronter.rs, src/bin/ui.rs) to neutral wording. - Updated config.exit-node.example.json `_comment` strings and the example URL. - Updated main README.md FAQ entries (Persian + English) and docs/guide.md / docs/guide.fa.md. - Old changelog files (v1.9.4 / v1.9.5 / v1.9.9) had val.town mentions retroactively replaced too — same redaction principle. - Bumped to v1.9.10 with a changelog noting the rename + Telegram channel brief format from earlier today. Users who already have an exit node deployed (on whichever host they picked) don't need to change anything — the wire protocol is identical and the renamed script is byte-identical to the old one. Tests: 179 lib + 35 tunnel-node green. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
184 lines
8.5 KiB
Markdown
184 lines
8.5 KiB
Markdown
# Exit node — bypassing CF anti-bot for ChatGPT / Claude / Grok / X
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Many Cloudflare-fronted services flag traffic from Google datacenter
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IPs as bots and serve a Turnstile / CAPTCHA / 502 challenge instead of
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the real page. `UrlFetchApp.fetch()` in Apps Script always exits from
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Google's datacenter IP space, so for sites like:
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- **chatgpt.com / openai.com**
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- **claude.ai**
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- **grok.com / x.com**
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…mhrv-rs's normal apps_script-mode path returns errors like `Relay
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error: json: key must be a string at line 2 column 1` or `502 Relay
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error` because Code.gs is wrapping a CF challenge HTML page that the
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client can't parse as relay JSON.
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The **exit node** is a small TypeScript HTTP handler you deploy on a
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serverless TypeScript host you control. It sits between Apps Script
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and the destination, so the request chain becomes:
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```
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Browser ─┐ ┌─→ Destination
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│ │ (chatgpt.com)
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▼ │
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mhrv-rs │
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│ │
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│ TLS to Google IP, SNI=www.google.com (DPI cover)│
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▼ │
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Apps Script (Google datacenter) │
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│ │
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│ UrlFetchApp.fetch(EXIT_NODE_URL) │
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▼ │
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your exit node (non-Google IP) │
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│ │
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│ fetch(real_url) │
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└──────────────────────────────────────────────────┘
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```
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The destination sees the exit node's outbound IP, not a Google
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datacenter IP. CF's anti-bot heuristic doesn't fire and the real page
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comes back.
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**Important property preserved:** the user-side leg (Iran ISP →
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Apps Script) is unchanged. The ISP only sees TLS to a Google IP — the
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second hop happens entirely inside Apps Script's outbound, invisible
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from the user's network. The DPI evasion property mhrv-rs is built
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around stays intact.
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## Setup
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The handler in [`exit_node.ts`](exit_node.ts) is plain TypeScript that
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uses only web-standard APIs (`Request`, `Response`, `fetch`). It runs
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on any platform with a serverless-fetch runtime.
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### Generic steps (apply to every host)
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1. **Open `exit_node.ts`** and replace the placeholder PSK at the top:
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```ts
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const PSK = "<your-strong-secret>";
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```
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Generate a strong secret with `openssl rand -hex 32`. **Do not leave
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the placeholder** — the script is deliberately fail-closed (returns
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503 on every request until the placeholder is replaced) so a fresh
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deploy without configuration can't accidentally serve as an open
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relay.
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2. **Deploy** to your chosen host (see options below).
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3. **Copy the public URL** of the deployed handler.
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4. **In `mhrv-rs` config.json**, add an `exit_node` block:
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```json
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"exit_node": {
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"enabled": true,
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"relay_url": "https://your-deployed-exit-node.example.com",
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"psk": "<the same PSK you set in step 1>",
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"mode": "selective",
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"hosts": ["chatgpt.com", "claude.ai", "x.com", "grok.com", "openai.com"]
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}
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```
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5. **Restart mhrv-rs** (Disconnect + Connect, or kill + restart the
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binary).
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6. **Test** — open `chatgpt.com` or `grok.com` from a browser pointed
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at mhrv-rs's proxy. You should see the real login page, not a CF
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challenge.
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A complete example config is at
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[`config.exit-node.example.json`](../../config.exit-node.example.json)
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in the repo root.
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### Hosting options
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The script is one self-contained file. Pick whichever host you can
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sign up for and trust:
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| Host | Notes |
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|---|---|
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| **Deno Deploy** ([deno.com/deploy](https://deno.com/deploy)) | Free tier covers personal use. Deploy via `deployctl deploy --prod exit_node.ts` or via GitHub Actions. Same web-standard API as the script expects. |
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| **fly.io** | Free tier with limits. Wrap the handler in a thin server (`Deno.serve(handler)` for Deno or an Express wrapper for Node) + add a Dockerfile. Persistent IPs, picks geographic region. |
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| **Your own VPS** | Run `deno run --allow-net wrapper.ts` where `wrapper.ts` does `Deno.serve({ port: 8443 }, handler)`. Most control, ~$3-5/mo. |
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| **Cloudflare Workers** | **Doesn't help.** CF Workers exit through CF's own IP space, which CF anti-bot still flags as worker-internal traffic. |
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For most users running locally, Deno Deploy is the fastest setup. For
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a long-term deployment you control end-to-end, your own small VPS is
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ideal.
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## `selective` vs `full`
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| Mode | What it does | When to use |
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|---|---|---|
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| `selective` (default) | Only hosts in `hosts` route via the exit node; everything else takes the normal Apps Script path | Recommended. The exit-node hop adds ~200-500ms per request, so reserve it for sites that actually need a non-Google IP. |
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| `full` | Every request routes via the exit node | Only when your entire workload is CF-anti-bot affected, or when your exit node is faster than Apps Script on your network path (rare). Burns the exit node's runtime budget on sites that don't need it. |
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## Behaviour on failure
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If the exit node is unreachable, returns 5xx, or returns a malformed
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response, mhrv-rs **automatically falls back to the regular Apps
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Script relay**. The log shows a `warn: exit node failed for ... —
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falling back to direct Apps Script` line. The CF-affected sites then
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fail (CF challenge), but every other site keeps working — a downed
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exit node doesn't take you fully offline.
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## Security model
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The PSK is the only thing keeping the deployed endpoint from being a
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public open proxy. Treat it like a password:
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- **Don't commit** the PSK to source control. Most TypeScript hosts
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default deployed code to private; keep it that way.
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- **Don't share publicly.** Anyone with both the URL and the PSK can
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use the deployment as their own proxy and burn your runtime quota.
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- **Rotate** if you suspect a leak. Change the PSK in the deployed
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source, redeploy, then update `psk` in `mhrv-rs` config.json and
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restart.
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The script also includes a **loop guard** (refuses to fetch its own
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host) and a **placeholder check** (returns 503 if `PSK ===
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"CHANGE_ME_TO_A_STRONG_SECRET"`) so a fresh deploy without
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configuration can't be accidentally served as an open relay.
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## Why isn't this on by default?
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- Adds ~200-500ms per request through the exit-node hop
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- Burns the host's free-tier runtime quota
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- No benefit for sites that don't have CF anti-bot
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- Requires signing up for a separate third-party platform
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So `enabled: false` is the default. Users who specifically need
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ChatGPT / Claude / Grok opt in; everyone else runs lighter.
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## Troubleshooting
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**`exit node refused or errored: unauthorized`** — PSK mismatch.
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Double-check `psk` in `config.json` matches the `PSK` constant in your
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deployed source character-for-character. Whitespace and quoting
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matter.
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**`exit_node misconfigured: PSK is still the placeholder`** — you
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forgot to replace `CHANGE_ME_TO_A_STRONG_SECRET` in the source. Edit
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the deployed file, save, redeploy.
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**`exit node failed for ...: connection refused`** — the URL is wrong
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or the deployment isn't live. Verify by hitting the URL in a browser
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— it should respond with `{"e":"method_not_allowed"}` (the script
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expects POST).
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**`exit node failed for ...: timeout`** — the host's outbound or the
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destination is slow. Try a different region, or accept the latency
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trade-off.
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**Site still shows a CF challenge after enabling the exit node** —
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CF has flagged your host's IP too. Some hosting providers' outbound
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IP space is on CF's bot blocklist. Workarounds: try a different host
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(your own VPS gives you a clean IP), or add the affected site to
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`passthrough_hosts` to bypass the MITM and use your real ISP IP.
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## See also
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- [Persian (راهنمای فارسی)](README.fa.md) version of this doc
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- [`exit_node.ts`](exit_node.ts) — the handler source (with hardening)
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- [`config.exit-node.example.json`](../../config.exit-node.example.json)
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— complete example mhrv-rs config
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- Issue [#382](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/issues/382)
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— canonical thread tracking Cloudflare anti-bot
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- Issue [#309](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/issues/309)
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— roadmap for CF WARP integration (alternative approach, longer-horizon)
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