# 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 for DoH.
- GeoIP offline lookup via GeoLite2 Country/ASN.
- Subnet calculator: subnet/contains/overlap/summarize.

## 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 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 detect example.com --transport doh --servers 1.1.1.1 --tls-name cloudflare-dns.com
wtfn dns watch --duration 10s --filter example.com

# 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
```

## Supported flags
Global flags:
- `--json` / `--pretty`
- `--no-color` / `--quiet`
- `-v` / `-vv`
- `--log-level <error|warn|info|debug|trace>`
- `--log-format <text|json>`
- `--log-file <path>`

Command flags (implemented):
- `sys ip`: `--all`, `--iface <name>`
- `sys route`: `--ipv4`, `--ipv6`, `--to <ip>`
- `ports listen`: `--tcp`, `--udp`, `--port <n>`
- `neigh list`: `--ipv4`, `--ipv6`, `--iface <name>`
- `probe ping`: `--count <n>`, `--timeout-ms <n>`, `--interval-ms <n>`, `--no-geoip`
- `probe tcping`: `--count <n>`, `--timeout-ms <n>`, `--no-geoip`
- `probe trace`: `--max-hops <n>`, `--timeout-ms <n>`, `--udp`, `--port <n>`, `--no-geoip`
- `dns query`: `--server <ip[:port]>`, `--transport <udp|tcp|dot|doh>`, `--tls-name <name>`, `--socks5 <url>`, `--timeout-ms <n>`
- `dns detect`: `--servers <csv>`, `--transport <udp|tcp|dot|doh>`, `--tls-name <name>`, `--socks5 <url>`, `--repeat <n>`, `--timeout-ms <n>`
- `dns watch`: `--duration <Ns|Nms>`, `--iface <name>`, `--filter <pattern>`

## 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 and package
```bash
cmake -S . -B build
cmake --build build
cmake --build build --target package
```

Install:
```bash
cmake --build build --target install
```

## 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)
- TLS extras: OCSP stapling indicator, more chain parsing
- ports conns improvements (top talkers / summary)
- better baseline/diff for system roots
- smarter "diagnose <domain>" workflow mode

## Current stage
Implemented:
- Core CLI with JSON output and logging.
- sys, ports, neigh, cert roots.
- geoip, probe, dns query/detect/watch.
- DoT/DoH + SOCKS5 proxy for DoH.
- calc subcrate with subnet/contains/overlap/summarize.
- CMake/Makefile build + package + install targets.

In progress:
- http, tls, discover, diag.

## License
MIT (see `LICENSE`).