WTFnet/docs/requirement_docs.md

---

# README.md

````markdown
# WTFnet

**WTFnet** is a pure CLI toolbox for diagnosing network problems on **Linux (Debian/Ubuntu)** and **Windows**.

> _"What the f\*ck is my networking doing?"_

It combines system network inspection, port/process visibility, DNS poisoning checks, HTTP/TLS diagnostics, GeoIP enrichment, ARP/NDP neighbor tables, and lightweight discovery tools — all in one consistent CLI.

## Goals

- **Pure CLI** (no REPL / no TUI)
- **Fast + scriptable** output (`--json` supported everywhere)
- **First-class support:** Linux (Debian/Ubuntu), Windows
- **Rust implementation**
- **Graceful degradation** when OS APIs differ or privileges are missing

## Quickstart

### Show interfaces & IPs
```bash
wtfnet sys ifaces
wtfnet sys ip --all
wtfnet sys route
````

### Find which process owns port 443

```bash
wtfnet ports who 443
wtfnet ports listen --tcp
```

### DNS poisoning detection (multi-resolver compare)

```bash
wtfnet dns detect example.com
wtfnet dns detect example.com --servers 1.1.1.1,8.8.8.8,9.9.9.9 --repeat 3
```

### HTTP + TLS diagnostics

```bash
wtfnet http head https://example.com --show-headers --http2-only
wtfnet tls handshake example.com:443 --show-chain
wtfnet tls verify example.com:443
```

### GeoIP lookup (local GeoLite2 DBs)

```bash
wtfnet geoip 8.8.8.8
wtfnet probe tcping example.com:443 --geoip
```

### Neighbor table (ARP / NDP)

```bash
wtfnet neigh list
wtfnet neigh list --ipv4
wtfnet neigh list --ipv6
```

### Generate a diagnostic report bundle

```bash
wtfnet diag --bundle out.zip
```

## Output modes

* Default: readable tables / summaries
* Machine-readable: `--json`
* Pretty JSON: `--json --pretty`
* Logs go to **stderr** (JSON output stays clean)

Example:

```bash
wtfnet sys ip --json --pretty > ip.json
```

## Logging

```bash
wtfnet --log-level debug sys route
wtfnet --log-format json sys dns
wtfnet --log-file wtfnet.log diag
```

Environment variables:

* `NETTOOL_LOG_LEVEL`
* `NETTOOL_LOG_FORMAT`
* `NETTOOL_LOG_FILE`

## License

TBD

````

---

# REQUIREMENTS.md

```markdown
# WTFnet — Requirements (v0.2)

## 1. Product overview

### 1.1 Purpose
WTFnet is a **single-executable CLI toolbox** for diagnosing network problems:
- inspect IP/interface/route/DNS
- probe connectivity (ICMP/TCP/path)
- detect **DNS poisoning**
- inspect **trusted root certificates**
- map **listening ports → processes**
- run **HTTP/TLS diagnostics**
- view **ARP/NDP neighbor cache**
- perform lightweight **service discovery**
- export a consistent report bundle for incident response

### 1.2 Design goals
- Pure CLI: no REPL / no TUI
- Script-friendly: stable output & exit codes
- First-class support: **Linux (Debian/Ubuntu)** + **Windows**
- Rust implementation
- Works without admin where possible; warns clearly when privileges required

---

## 2. Platform support

### 2.1 First-class OS targets
- Linux: Debian / Ubuntu
- Windows 10/11 + Windows Server

### 2.2 Best-effort targets
- macOS (not required for v0.x)

---

## 3. CLI UX requirements

### 3.1 Global flags
All commands MUST support:
- `--json` (machine output)
- `--pretty` (pretty JSON)
- `--no-color`
- `--quiet`
- `-v`, `-vv` (verbosity)
- logging flags (see §4)

### 3.2 Exit codes
- `0`: success
- `1`: generic failure
- `2`: invalid args
- `3`: insufficient permissions
- `4`: timeout/unreachable category
- `5`: partial success (some checks failed; still produced results)

---

## 4. Logging requirements

### 4.1 Goals
- Debug WTFnet itself in production environments
- Preserve clean stdout for piping / JSON mode

### 4.2 Behavior
- Logs MUST go to **stderr**
- Command output MUST go to **stdout**
- JSON output must remain valid even with debug logs enabled

### 4.3 Controls
Flags:
- `--log-level <error|warn|info|debug|trace>` (default `info`)
- `--log-format <text|json>` (default `text`)
- `--log-file <path>` (optional; write logs there; may also tee stderr)

Env vars:
- `NETTOOL_LOG_LEVEL`
- `NETTOOL_LOG_FORMAT`
- `NETTOOL_LOG_FILE`

### 4.4 Sensitive logging policy
- Do NOT log secrets by default (tokens, cookies, passwords)
- HTTP response bodies are hidden by default
- Provide explicit `--show-secrets` / `--show-body` gates where relevant

---

## 5. Functional requirements

### 5.1 System inspection (`sys`)
#### 5.1.1 Interfaces & addresses
Must provide:
- interface name/index, state, MTU, MAC
- IPv4/IPv6 addresses with prefix + scope
- DNS servers + search domains (best-effort)
- default gateway mapping (best-effort)

Commands:
- `wtfnet sys ifaces`
- `wtfnet sys ip --all`
- `wtfnet sys route`
- `wtfnet sys dns`

#### 5.1.2 Routing table
Outputs:
- destination/prefix, gateway/next hop, interface, metric

---

### 5.2 Certificate inspection (`cert`)
Must list system-wide trusted roots:
- subject, issuer
- validity range
- serial number
- SHA1 + SHA256 fingerprint
- key algorithm + size
- OS store origin (Windows store / Linux path)

Commands:
- `wtfnet cert roots`
- `wtfnet cert roots --filter subject="DigiCert"`
- `wtfnet cert roots --export baseline.json`
- `wtfnet cert roots --diff baseline.json`

---

### 5.3 Active probing (`probe`)
#### 5.3.1 ping
- IPv4/IPv6
- count/timeout/interval
- summary: min/avg/max latency, packet loss

#### 5.3.2 tcping
- hostname or IP:port
- resolution result
- connect latency
- failure classification

#### 5.3.3 trace
- hop list with RTT and IP
- IPv4/IPv6 best-effort

#### 5.3.4 GeoIP enrichment integration
All probe commands must support:
- `--geoip` to attach GeoIP info to targets/resolved IPs/hops

---

### 5.4 GeoIP (`geoip`)
#### 5.4.1 Local DB support (GeoLite2 Country + ASN)
- Country DB + ASN DB used offline
- degrade gracefully if missing

DB configuration:
- flags:
  - `--country-db <path>`
  - `--asn-db <path>`
- env vars:
  - `NETTOOL_GEOIP_COUNTRY_DB`
  - `NETTOOL_GEOIP_ASN_DB`

Commands:
- `wtfnet geoip <ip>`
- `wtfnet geoip status`

Outputs:
- country + ISO code if available
- ASN number + org name
- DB source/version timestamp if detectable

---

### 5.5 DNS diagnostics (`dns`)
#### 5.5.1 Query
Commands:
- `wtfnet dns query <domain> <type> [--server <ip>] [--tcp]`

Outputs:
- rcode, answer set + TTL, timing, server used

#### 5.5.2 Active poisoning detection
Commands:
- `wtfnet dns detect example.com`
- `wtfnet dns detect example.com --servers 1.1.1.1,8.8.8.8 --repeat 5`

Heuristics to flag suspicious:
- major answer divergence across resolvers
- abnormal TTL patterns
- unexpected private/reserved results
- NXDOMAIN injection patterns

Output verdict:
- `clean | suspicious | inconclusive`
with evidence list

#### 5.5.3 Passive watch (best-effort)
Commands:
- `wtfnet dns watch --duration 30s [--iface eth0] [--filter example.com]`

Must:
- be time-bounded
- clearly document privilege requirements (pcap)

---

### 5.6 Ports & processes (`ports`)
Must show listening sockets and owners:
- proto, local addr:port, state
- PID, PPID (best-effort), process name/path
- user/owner (best-effort)

Commands:
- `wtfnet ports listen --tcp|--udp`
- `wtfnet ports who <port>`

(Optional)
- `wtfnet ports conns`

---

### 5.7 Subnet calculator (`calc`)
Commands:
- `wtfnet calc subnet <cidr|ip mask>`
- `wtfnet calc contains <cidrA> <cidrB>`
- `wtfnet calc overlap <cidrA> <cidrB>`
- `wtfnet calc summarize <cidr1> <cidr2> ...`

---

### 5.8 HTTP diagnostics (`http`)
Goals:
- verify endpoint health and protocol negotiation
- help debug redirect loops, TLS errors, HTTP version issues

Commands:
- `wtfnet http head <url>`
- `wtfnet http get <url>`

Flags:
- `--http1-only`
- `--http2-only`
- `--http3` (best-effort optional)
- `--timeout 3s`
- `--follow-redirects [N]`
- `--header "K: V"` (repeatable)
- `--show-headers`
- `--show-body` (off by default)
- `--max-body <bytes>`
- `--geoip`

Required outputs:
- resolved IP(s)
- negotiated HTTP version (1.1/2/3)
- status code
- optional headers/body
- timing breakdown (best-effort):
  - DNS
  - connect / QUIC handshake
  - TLS handshake
  - TTFB
  - total

---

### 5.9 TLS diagnostics (`tls`)
Commands:
- `wtfnet tls handshake <host:port>`
- `wtfnet tls cert <host:port>`
- `wtfnet tls verify <host:port>`
- `wtfnet tls alpn <host:port>`

Flags:
- `--sni <hostname>`
- `--alpn h2,http/1.1`
- `--insecure`
- `--show-chain`
- `--geoip`

Outputs:
- TLS version + cipher
- ALPN negotiated
- chain summary (subject/issuer/validity/SAN best-effort)
- verification verdict + error category

---

### 5.10 Neighbor table (`neigh`)
Commands:
- `wtfnet neigh list [--ipv4|--ipv6] [--iface eth0]`

Outputs:
- IP → MAC/LLADDR mapping
- interface
- state (reachable/stale/failed if available)

---

### 5.11 Discovery services (`discover`)
Purpose: lightweight local discovery, bounded and safe.

Commands:
- `wtfnet discover mdns --duration 3s`
- `wtfnet discover ssdp --duration 3s`
(optional)
- `wtfnet discover llmnr --duration 3s`
- `wtfnet discover nbns --duration 3s`

Outputs:
- service/device name
- IP/port if present
- protocol and service type

---

### 5.12 Diagnostic bundle (`diag`)
Commands:
- `wtfnet diag`
- `wtfnet diag --out report.json --json`
- `wtfnet diag --bundle out.zip`

Bundle must include:
- sys snapshot
- routes
- dns config + optional detect check
- ports listen
- neighbor snapshot
- meta.json (OS, version, timestamp, privilege hints)

---

## 6. Non-functional requirements

- robust error handling (no panics)
- partial results allowed (exit code `5`)
- no indefinite hangs (timeouts everywhere)
- privacy: never exfiltrate data; don’t log secrets by default

---

## 7. Acceptance criteria (v0.2)
On Linux (Debian/Ubuntu) and Windows:
- sys inspection works
- cert roots listing/filter works
- ping + tcping works (IPv4/IPv6 best-effort)
- dns query + detect works with verdict+evidence
- ports listen/who works (best-effort PID mapping)
- http head/get works with HTTP/2 support
- tls handshake/verify works with clear output
- neigh list works (ARP/NDP snapshot)
- logging behaves correctly without breaking JSON output
````

---

# COMMANDS.md

````markdown
# WTFnet — Command Reference

This file documents WTFnet CLI commands and flags.

## Global flags

Applies to all commands:

- `--json` : machine-readable output
- `--pretty` : pretty JSON (requires `--json`)
- `--no-color` : disable ANSI color
- `--quiet` : minimal output
- `-v`, `-vv` : verbose output
- `--log-level <error|warn|info|debug|trace>`
- `--log-format <text|json>`
- `--log-file <path>`

Exit codes: see `REQUIREMENTS.md`

---

## sys

### `wtfnet sys ifaces`
Show interface inventory.

### `wtfnet sys ip [--all] [--iface <name>]`
Show IP addresses.

### `wtfnet sys route [--ipv4|--ipv6] [--to <ip>]`
Show routing table; optionally “route-to target”.

### `wtfnet sys dns`
Show resolver configuration snapshot.

---

## cert

### `wtfnet cert roots`
List trusted root certificates.

Common filters:
- `--filter subject="..."`
- `--expired`
- `--fingerprint <sha256>`

Baseline tools:
- `--export <file.json>`
- `--diff <baseline.json>`

---

## probe

### `wtfnet probe ping <host|ip> [--count N] [--timeout 800ms] [--interval 200ms] [--geoip]`
ICMP echo with stats.

### `wtfnet probe tcping <host:port> [--count N] [--timeout 800ms] [--geoip]`
TCP connect timing.

### `wtfnet probe trace <host|ip> [--max-hops N] [--timeout 800ms] [--geoip]`
Traceroute-like path discovery.

---

## geoip

### `wtfnet geoip <ip|host> [--resolve]`
Geo lookup (offline DB).

### `wtfnet geoip status`
Show DB presence and detected paths.

DB flags:
- `--country-db <path>`
- `--asn-db <path>`

Env vars:
- `NETTOOL_GEOIP_COUNTRY_DB`
- `NETTOOL_GEOIP_ASN_DB`

---

## dns

### `wtfnet dns query <domain> <TYPE> [--server <ip>] [--tcp] [--timeout 2s]`
Dig-like query.

Examples:
```bash
wtfnet dns query example.com A
wtfnet dns query example.com AAAA --server 1.1.1.1
wtfnet dns query example.com A --tcp
````

### `wtfnet dns detect <domain> [--servers <csv>] [--repeat N] [--timeout 2s]`

Compare across resolvers and detect anomalies.

### `wtfnet dns watch [--iface <name>] [--duration 30s] [--filter <pattern>]`

Passive watch (best-effort; may require privileges).

---

## ports

### `wtfnet ports listen [--tcp|--udp] [--port N]`

Show listening sockets.

### `wtfnet ports who <port|ip:port>`

Find owning process.

(Optional)

### `wtfnet ports conns [--top N]`

Show active connections.

---

## calc

### `wtfnet calc subnet <CIDR|ip mask>`

Subnet information.

### `wtfnet calc contains <CIDR-A> <CIDR-B>`

Containment check.

### `wtfnet calc overlap <CIDR-A> <CIDR-B>`

Overlap check.

### `wtfnet calc summarize <CIDR...>`

Summarize multiple networks.

---

## http

### `wtfnet http head <url>`

### `wtfnet http get <url>`

Core flags:

* `--http1-only`
* `--http2-only`
* `--http3` (best-effort)
* `--timeout 3s`
* `--follow-redirects [N]`
* `--header "K: V"` (repeatable)
* `--show-headers`
* `--show-body`
* `--max-body <bytes>`
* `--geoip`

Examples:

```bash
wtfnet http head https://example.com --http2-only --show-headers
wtfnet http get https://example.com --follow-redirects 5
```

---

## tls

### `wtfnet tls handshake <host:port>`

### `wtfnet tls cert <host:port>`

### `wtfnet tls verify <host:port>`

### `wtfnet tls alpn <host:port>`

Flags:

* `--sni <hostname>`
* `--alpn h2,http/1.1`
* `--insecure`
* `--show-chain`
* `--geoip`

Examples:

```bash
wtfnet tls handshake example.com:443 --show-chain
wtfnet tls verify example.com:443
```

---

## neigh

### `wtfnet neigh list [--ipv4|--ipv6] [--iface <name>]`

Show neighbor table (ARP/NDP).

---

## discover

### `wtfnet discover mdns --duration 3s`

### `wtfnet discover ssdp --duration 3s`

(Optional)

### `wtfnet discover llmnr --duration 3s`

### `wtfnet discover nbns --duration 3s`

---

## diag

### `wtfnet diag [--json] [--out <file>]`

Generate report.

### `wtfnet diag --bundle <zip>`

Export support bundle.

Examples:

```bash
wtfnet diag --json --pretty --out report.json
wtfnet diag --bundle out.zip
```

````

---

# CONFIG.md

```markdown
# WTFnet — Configuration

WTFnet supports configuration via:

Priority order:
1) CLI flags
2) Environment variables
3) Config file (optional)
4) Built-in defaults

## Config file location (proposed)

Linux:
- `$XDG_CONFIG_HOME/wtfnet/config.json`
- fallback: `~/.config/wtfnet/config.json`

Windows:
- `%APPDATA%\wtfnet\config.json`

## Example config.json

```json
{
  "geoip": {
    "country_db": "/opt/geoip/GeoLite2-Country.mmdb",
    "asn_db": "/opt/geoip/GeoLite2-ASN.mmdb"
  },
  "dns": {
    "detect_servers": ["1.1.1.1", "8.8.8.8", "9.9.9.9"],
    "timeout_ms": 2000,
    "repeat": 3
  },
  "probe": {
    "timeout_ms": 800,
    "count": 4
  },
  "http": {
    "timeout_ms": 3000,
    "follow_redirects": 3,
    "max_body_bytes": 8192
  },
  "logging": {
    "level": "info",
    "format": "text",
    "file": null
  }
}
````

## Environment variables

GeoIP:

* `NETTOOL_GEOIP_COUNTRY_DB`
* `NETTOOL_GEOIP_ASN_DB`

Lookup order:
1) Environment variable path
2) `data/` next to the CLI binary
3) `data/` in the current working directory

Logging:

* `NETTOOL_LOG_LEVEL`
* `NETTOOL_LOG_FORMAT`
* `NETTOOL_LOG_FILE`

````

---

# OUTPUT_SCHEMA.md

```markdown
# WTFnet — JSON Output Conventions

All commands support `--json`.

## General rules

- Output must be valid JSON to stdout
- Logs always go to stderr
- Prefer stable keys; changes should be additive
- Include metadata about tool version + timestamp

## Common wrapper schema (recommended)

```json
{
  "meta": {
    "tool": "wtfnet",
    "version": "0.2.0",
    "timestamp": "2026-01-15T22:01:00-05:00",
    "os": "linux|windows",
    "arch": "x86_64",
    "privileges": {
      "is_admin": false,
      "notes": ["pcap capture requires elevated privileges"]
    }
  },
  "command": {
    "name": "sys ip",
    "args": ["--all"]
  },
  "data": {},
  "warnings": [],
  "errors": []
}
````

## Error representation

* `errors[]` should contain structured objects:

```json
{
  "code": "PERMISSION_DENIED|TIMEOUT|NOT_SUPPORTED|IO_ERROR",
  "message": "Human readable explanation",
  "details": { "hint": "Try running as admin" }
}
```

## Timing fields (for probe/http/tls)

Use milliseconds:

```json
{
  "timing_ms": {
    "dns_resolve": 12,
    "connect": 40,
    "tls_handshake": 55,
    "ttfb": 70,
    "total": 120
  }
}
```

````

---

# ROADMAP.md

```markdown
# WTFnet — Roadmap

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

## v0.2 (this requirements set)
- 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
````

---

# SECURITY.md

```markdown
# WTFnet — Security & Privacy Notes

## Data handling
- WTFnet performs local inspections and probes.
- It does not upload anything automatically.

## Sensitive output defaults
- HTTP bodies are not printed by default.
- Secrets (Authorization/Cookies) are never logged by default.

## Capture-based features
Some features (e.g. passive DNS watch) may require elevated privileges.
WTFnet must clearly indicate when a feature is:
- unavailable
- permission-limited
- OS-limited
```

---

# docs/platform-notes.md

```markdown
# Platform Notes

## Linux (Debian/Ubuntu)
- sys: netlink (/proc, /sys) sources
- neigh: `ip neigh` equivalent via netlink
- ports: `/proc/net/*` + process mapping

## Windows
- sys: Win32 APIs (IP Helper API etc.)
- ports/process mapping: Windows APIs (best-effort)
- cert roots: Windows certificate store APIs
```

---

# docs/troubleshooting.md

```markdown
# Troubleshooting

## `dns watch` shows permission errors
Passive capture may require elevated privileges or pcap capabilities.
Run as admin/root or configure capture permissions appropriately.

## `ping` not working without admin
Some OS configurations restrict ICMP sockets. Use:
- `wtfnet probe tcping <host:port>` as an alternative reachability test.
```

---