# WTFnet

WTFnet is a pure CLI toolbox for diagnosing network problems on Linux and Windows.

## Highlights
- System snapshot: interfaces, IPs, routes, DNS config.
- Ports, neighbors, and trusted root certificates.
- Probing: ping, tcping, traceroute (best-effort).
- DNS: query/detect/watch with GeoIP, DoT/DoH, and SOCKS5 support.
- DNS leak detection with policy profiles and privacy modes (best-effort).
- GeoIP offline lookup via GeoLite2 Country/ASN.
- Subnet calculator: subnet/contains/overlap/summarize.
- Discover: mDNS/SSDP plus LLMNR/NBNS.

## Quickstart
```bash
cargo run -p wtfnet-cli -- sys ifaces
cargo run -p wtfnet-cli -- dns query example.com A
cargo run -p wtfnet-cli -- calc subnet 192.168.1.10 255.255.255.0
```

## Usage examples
```bash
# System snapshot
wtfn sys ifaces
wtfn sys ip --all
wtfn sys route --ipv4
wtfn sys dns

# Ports and neighbors
wtfn ports listen --tcp
wtfn ports who 443
wtfn neigh list --ipv6

# GeoIP and probing
wtfn geoip lookup 8.8.8.8
wtfn probe ping example.com --count 4
wtfn probe tcping example.com:443 --count 4
wtfn probe tcping example.com:443 --socks5 socks5://127.0.0.1:10808
wtfn probe trace example.com:443 --max-hops 20

# DNS
wtfn dns query example.com A
wtfn dns query example.com AAAA --server 1.1.1.1
wtfn dns query example.com A --transport doh --server 1.1.1.1 --tls-name cloudflare-dns.com
wtfn dns query example.com A --transport dot --server 1.1.1.1 --tls-name cloudflare-dns.com --socks5 socks5://127.0.0.1:10808
wtfn dns detect example.com --transport doh --servers 1.1.1.1 --tls-name cloudflare-dns.com
wtfn dns watch --duration 10s --filter example.com
wtfn dns watch --follow
wtfn dns leak status
wtfn dns leak watch --duration 10s --profile proxy-stub
wtfn dns leak watch --follow
wtfn dns leak report report.json

# TLS
wtfn tls handshake example.com:443
wtfn tls handshake example.com:443 --socks5 socks5://127.0.0.1:10808
wtfn tls cert example.com:443
wtfn tls verify example.com:443
wtfn tls alpn example.com:443 --alpn h2,http/1.1

# Discover
wtfn discover mdns --duration 3s
wtfn discover ssdp --duration 3s
wtfn discover llmnr --duration 3s
wtfn discover nbns --duration 3s

# Diag
wtfn diag --out report.json --json
wtfn diag --bundle report.zip

# Calc
wtfn calc contains 192.168.0.0/16 192.168.1.0/24
wtfn calc overlap 10.0.0.0/24 10.0.1.0/24
wtfn calc summarize 10.0.0.0/24 10.0.1.0/24
```

## Command reference
See `docs/COMMANDS.md` for the full list of commands and flags (with descriptions).

## GeoIP data files
GeoLite2 mmdb files should live in `data/`.
Lookup order:
1) `NETTOOL_GEOIP_COUNTRY_DB` / `NETTOOL_GEOIP_ASN_DB`
2) `data/` next to the CLI binary
3) `data/` in the current working directory

## Build

### Only build binary
```bash
cargo build --release
```

### Build and package
1. Prepare GeoLite2 databases (required `GeoLite2-ASN.mmdb` and `GeoLite2-Country.mmdb` ):

```bash
# Place your mmdb files under data/
mkdir data
```

> **Note**: This step requires `python3` and `just`.

2. Use `just` to run build and package command (Note: you don't need bash environment on windows):

```bash
# You will find package under dist/, zip file on windows, tar.gz file on linux
just release
```

## HTTP/3 (experimental)
HTTP/3 support is feature-gated and best-effort. Enable it only when you want to test QUIC
connectivity.

To enable locally for testing:
```bash
cargo run -p wtfnet-cli --features wtfnet-http/http3 -- http head https://cloudflare-quic.com --http3
```

## Roadmap
### v0.1 (MVP)
- sys: ifaces/ip/route/dns
- ports: listen/who
- probe: ping + tcping
- calc: subnet/contains/overlap
- basic logging + --json everywhere

### v0.2 (current requirements)
- dns: query + detect + watch (best-effort)
- geoip: local Country+ASN mmdb integration
- http: head/get (HTTP/2 required; HTTP/3 best-effort optional)
- tls: handshake/verify/cert/alpn
- neigh: ARP/NDP snapshot
- discover: mdns + ssdp (bounded)
- diag: bundle export (zip)

### v0.3 (future upgrades)
- richer trace output (reverse lookup, per-hop loss, per-hop stats)
- HTTP timing accuracy (connect/tls)
- TLS extras: OCSP stapling indicator, richer cert parsing
- ports conns improvements (top talkers / summary)
- better baseline/diff for system roots
- optional LLMNR/NBNS discovery
- optional HTTP/3 (feature-gated; experimental, incomplete)

### v0.4 (current requirements)
- dns leak detection (passive watch + report)
- process attribution (best-effort)
- policy profiles + privacy modes

## Current stage
Implemented:
- Core CLI with JSON output and logging.
- sys, ports, neigh, cert roots.
- geoip, probe, dns query/detect/watch.
- http head/get with timing and GeoIP.
- tls handshake/verify/cert/alpn.
- DoT/DoH + SOCKS5 proxy support.
- discover mdns/ssdp/llmnr/nbns.
- dns leak detection (status/watch/report).
- diag report + bundle.
- calc subcrate with subnet/contains/overlap/summarize.
- CMake/Makefile build + package + install targets.
- Basic unit tests for calc and TLS parsing.

In progress:
- dns leak: DoH heuristic classification (optional).
- dns leak: Leak-D mismatch correlation (optional).

See `docs/implementation_status.md` for a design-vs-implementation view.

## License
MIT (see `LICENSE`).