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Feat/exposure explain - #17
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Any target containing "-" was sent to the IP range parser, so ordinary host names such as my-server.example.com or tcpcat-dedicated failed with "invalid range format" instead of being resolved. Only targets made of digits, dots and a dash (10.0.0.1-20, 10.0.0.1-10.0.0.20) are now treated as ranges; isHostname uses the same test so TLS SNI keeps the name.
`tcpcat inventory` (Linux, run on the host) lists every listening TCP socket from /proc with its owner: process, systemd unit, Docker container (docker-proxy attributed to the container publishing the port), Kubernetes pod, plus NodePort/LoadBalancer Services. Secret-looking arguments are redacted; nothing is sent on the network. `tcpcat explain <inventory.json> <scan.json>` joins it with a scan taken from outside and classifies each port: - EXPOSED: reachable and owned by a local listener, with the owner and a concrete fix (Redis, PostgreSQL, MySQL/MariaDB, MongoDB, SSH, Docker, Node/Python/Java apps, ...) - FORWARDED: reachable with no local listener for that address (DNAT, Docker/Kubernetes mapping, cloud load balancer); a matching Kubernetes Service takes precedence over a local listener on the same port, since external traffic is redirected before local delivery - SHIELDED: listens on every interface but only the firewall blocks it - LOCAL / UNTESTED --expect declares intentionally public ports; exit 1 when anything else is reachable, so it can gate CI. --target handles hosts behind 1:1 NAT.
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gofmt -l .produces no outputgo vet ./...passesgo test -race ./...passesREADME.md/docs/for user-facing changesTest plan