dsh-port-map

dsh-port-map

Port, service and Caddy route map for DeepSeek Harness.

dsh-port-map answers the questions a busy server keeps asking: what is on 9094? which unit owns this port? is every Caddy route still pointing at something alive? what is exposed to the internet?

Every tool is read-only. Nothing is opened, closed or reconfigured.

Tools

Tool	Kind	What it does
listening_ports	read-only	TCP listening sockets: port, bound address, reachability scope (public / localhost / interface), process, and the systemd unit or docker container that owns it. Filters: scope, port.
service_map	read-only	The reverse view: every unit/container with the ports it listens on, plus the ports nothing claims.
caddy_routes	read-only	Parses the Caddyfile into site → path → reverse_proxy upstream, then checks each upstream against the listening sockets.
url_check	read-only	HTTP status, latency and content type for an allow-listed host. A redirect is reported, not followed.

Example output

Listening TCP sockets (39):
  port  address         scope     owner
   8790  127.0.0.1       localhost dsh-web.service
  1933  127.0.0.1       localhost docker:openviking
  9090  0.0.0.0         public    map-service.service

Bound to all interfaces: 22, 443, 8642, 8799, 9090, 9091, 9094, 11434

Caddy routes (11) from /etc/caddy/Caddyfile:
  example.org /panel → 127.0.0.1:8788 · up (vps-panel.service)
  example.org /gone  → 127.0.0.1:9999 · DOWN

Install

dsh plugin --profile web add dsh-port-map
systemctl restart dsh-web   # or restart your DSH process

- id: port-map
  config:
    caddyfile: /etc/caddy/Caddyfile
    urlCheck:
      hosts:
        - 127.0.0.1
        - localhost
        - example.org
      timeoutMs: 10000
    docker: true
    safety:
      timeoutMs: 15000
      maxOutputBytes: 65536

Configuration

Key	Default	Meaning
caddyfile	/etc/caddy/Caddyfile	File parsed by caddy_routes.
urlCheck.hosts	["127.0.0.1", "localhost"]	Hosts url_check may request; everything else is refused.
urlCheck.timeoutMs	10000	Per-request timeout.
docker	true	Resolve container names for published ports.
safety.timeoutMs	15000	Default command timeout.
safety.maxOutputBytes	65536	Output cap per call.

How the owner is resolved

1. ss -tlnpH gives the socket, its bound address and the owning PID.
2. The PID's cgroup gives the systemd unit (/proc/<pid>/cgroup).
3. A docker-proxy socket is matched to its container through the published port (docker ps --format '{{.Names}}\t{{.Ports}}'), so the map shows docker:openviking rather than docker.service.

Nothing is guessed: an unclaimed socket is reported as unowned:<process>.

Honest limits

• Read-only: it reports, it does not fix. No firewall changes, no restarts.
• The Caddyfile parser understands site blocks, handle/handle_path and reverse_proxy (with or without an options block). !!js expressions, imported snippets or php_fastcgi-style directives are not modelled and are simply not reported.
• Docker name resolution needs docker ps to work for the current user; without it the socket is still listed with its docker:<id> marker.
• url_check never follows a redirect, so a redirect chain is reported as one hop, not resolved to the final page.

Requirements

• DSH >= 0.2.1-rc.4 (Node ^22.19.0 || >=24.0.0).
• ss (iproute2) for the socket tools; docker optional; the Caddyfile optional.

Development

npm run link-peers
node --test

License

MIT