CLI

The ngstone command is built on the stdlib flag package — no cobra, no subcommand framework. There are five verbs: auth, port, config, logout, and version.

Overview#

ngstone <command> [arguments]
 
Commands:
  auth <token>       verify and save an auth token
  port <port|url>    expose a local port or URL through the tunnel
  config             view or set local configuration
  logout             remove the saved auth token
  version            print the ngstone version

ngstone auth#

Verifies a token against the edge's control plane, then saves the token and server address to the config file. Nothing is written to disk until the edge has confirmed the token is valid.

$ ngstone auth <token>
verified against ngstone.site:4443 and saved

A bad token or an unreachable server exits non-zero with a specific, actionable message rather than a generic failure.

ngstone port#

Starts a tunnel to a local port or URL. This is the command that actually opens a connection to the edge and forwards traffic. When stdout is a terminal, it also opens a full-screen inspector dashboard showing every request and response live, with headers, decoded bodies, timing, and replay — see Using the request inspector.

$ ngstone port 3000
$ ngstone port http://127.0.0.1:3000
$ ngstone port 3000 --subdomain demo

The positional argument is either a bare port number (forwarded to http://127.0.0.1:<port>) or a full target URL. Flags may appear before or after it.

ngstone config#

Read or change the local config file without hand-editing JSON.

$ ngstone config set server ngstone.site:4443
server set to ngstone.site:4443
 
$ ngstone config get
token: nst_a1b2…9f3d
server: ngstone.site:4443
 
$ ngstone config get token
nst_a1b2…9f3d
 
$ ngstone config path
/home/you/.config/ngstone/config.json

config get always redacts the token — the middle of the value is replaced with …, only the first and last four characters are shown.

ngstone logout#

Clears the saved token from the config file. The server address is left untouched.

$ ngstone logout
logged out

ngstone version#

Prints the build's version string, injected at compile time via -ldflags.

$ ngstone version
ngstone v0.1.0 (commit 3f1a9c2, built 2026-06-01T12:00:00Z)

No arguments and -h#

Running ngstone with no arguments does not start a tunnel — it prints usage to stderr and exits 1. -h, --help, and -help print the same usage to stdout and exit 0.

Generating a token#

TOKEN=$(openssl rand -base64 32 | tr '+/' '-_' | tr -d '=')
HASH=$(printf '%s' "$TOKEN" | shasum -a 256 | cut -d' ' -f1)   # sha256sum on Linux

Keep $TOKEN for ngstone auth on every machine that will run the agent, and pass $HASH to the edge as -token-sha256 (or $NGSTONE_TOKEN_SHA256). There is exactly one token per edge — rotating it invalidates every agent at once, since it changes what the edge accepts, not something per-agent.

The config file#

ngstone auth, ngstone port, ngstone config, and ngstone logout all read and write the same JSON file:

$XDG_CONFIG_HOME/ngstone/config.json
# falls back to ~/.config/ngstone/config.json if XDG_CONFIG_HOME is unset

The file holds token and server. It's written with mode 0600 inside a 0700 directory, and saved via a temp-file-plus-rename so a crash mid-write can't corrupt it.

Resolution order for both the token and the server address:

Legacy flag form#

A flat-flags invocation is still supported alongside the verbs above, mainly for scripts and the e2e test suite written against it. It starts a tunnel directly — there's no config file involved.

$ ngstone -control ADDR -token TOK -target URL -subdomain NAME \
    -insecure -server-name NAME -pin SPKI -instance-id ID

Prefer ngstone auth plus ngstone port for day-to-day use — the legacy form exists for compatibility, not as the recommended path.