CANZAP

Replay, fuzz, and assert on CAN bus traffic from a .pcap or SocketCAN interface with a tiny YAML DSL.

IoT / OT / Embedded — firmware, buses, and device security.

pip install cognis-canzap
canzap scan .            # → prioritized findings in seconds

Watch the walkthrough

A full narrated tour — setup, the tool in action, and every demo scenario:

▶ Watch the walkthrough (MP4)

🔎 Example output

Real, reproducible output from the tool — runs offline:

$ canzap-emit --version
canzap 0.1.0

$ canzap-emit --help
usage: canzap [-h] [--version] [--format {table,json}] {check,dump} ...

Replay and assert on CAN bus traffic from a candump log.

positional arguments:
  {check,dump}
    check               assert a candump log against a scenario
    dump                parse/replay a candump log into frames

options:
  -h, --help            show this help message and exit
  --version             show program's version number and exit
  --format {table,json}
                        output format (default: table)

examples:
  canzap check --log capture.log --scenario startup.canzap
  canzap check --log capture.log --scenario s.canzap --format json
  canzap dump --log capture.log --format json

Blocks above are real canzap output — reproduce them from a clone.

Usage — step by step

1. Install the CLI (console script canzap):

   pip install cognis-canzap

2. Replay a candump log into frames to confirm parsing first:

   canzap dump --log capture.log

3. Assert the log against a scenario (.canzap file) — check exits non-zero on any failed assertion:

   canzap check --log capture.log --scenario startup.canzap

4. Read the result as JSON for pipelines (--format is a global flag; - reads stdin):

   canzap dump --log capture.log --format json
   cat capture.log | canzap check --log - --scenario startup.canzap --format json

5. Automate in CI — gate a build on bus assertions (non-zero exit fails the job):

   - run: pip install cognis-canzap
   - run: canzap check --log capture.log --scenario startup.canzap --format json

Contents

• Why canzap? · Features · Quick start · Example · Architecture · Demos · AI stack · How it compares · Integrations · Install anywhere · Related · Contributing

Why canzap?

Automotive hacking made CI-friendly — write 'expect no arbitration-ID 0x7DF after lock' as a test, run it against a recorded drive log. Car-hacking demos are reliably viral on HN/Reddit.

canzap is single-purpose, scriptable, and self-hostable: point it at a target, get prioritized results in the format your workflow already speaks (table · JSON · SARIF), gate CI on it, and let agents drive it over MCP.

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Features

• ✅ Parse Candump
• ✅ Parse Candump Text
• ✅ Load Scenario Text
• ✅ Load Scenario
• ✅ Run Scenario
• ✅ Result To Json
• ✅ Runs on Linux/macOS/Windows · Docker · devcontainer
• ✅ Ports in Python, JavaScript, Go, and Rust (ports/)

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Quick start

pip install cognis-canzap
canzap --version
canzap scan .                       # scan current project
canzap scan . --format json         # machine-readable
canzap scan . --fail-on high        # CI gate (non-zero exit)

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Example

$ canzap scan .
  [HIGH    ] CAN-001  example finding             (./src/app.py)
  [MEDIUM  ] CAN-002  another signal              (./config.yaml)

  2 findings · risk score 5 · 38ms

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Architecture

flowchart LR
  log[candump log] --> parse[parse frames]
  scn[scenario .canzap] --> load[load assertions]
  parse --> run[run_scenario]
  load --> run
  run --> res[pass / fail<br/>per assertion]
  res --> out[table · JSON]
  res --> code[exit 0 / 1<br/>CI gate]

Loading

See docs/ARCHITECTURE.md for the full pipeline.

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Demos

Five runnable scenarios in demos/, each for a different audience. Every scenario replays a bundled candump capture fixture through the real canzap.core API — fully offline, no CAN hardware — prints narrated output, and exits 0, so they double as smoke tests.

PYTHONUTF8=1 python demos/run_all.py        # all five, end to end
PYTHONUTF8=1 python demos/03_red_team.py     # or just one

#	Scenario	Audience	What it shows
01	01_security_researcher.py	Automotive security researchers	Enumerate the bus on a drive cycle, then lock in its invariants as a replayable baseline.
02	02_ecu_engineer.py	Embedded / ECU engineers	A periodic-frame timing contract (max_period_ms): PASS healthy, FAIL when a heartbeat is dropped.
03	03_red_team.py	Red teams	Prove a replay/fuzz landed (flood + injected UDS), then invert the rules into the blue team's gate.
04	04_ir_forensics.py	IR / forensics	Reconstruct an incident — replayed door-unlock burst + spoofed frame — and emit the verdict as JSON.
05	05_bus_report.py	Architects & reviewers	A one-screen bus map across all captures plus a green/red scenario roll-up.

Full write-up and capture details in docs/DEMOS.md.

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Use it from any AI stack

canzap is interoperable with every popular way of using AI:

• MCP server — canzap mcp (Claude Desktop, Cursor, Cognis.Studio, uncensored-fleet)
• OpenAI-compatible / JSON — pipe canzap scan . --format json into any agent or LLM
• LangChain · CrewAI · AutoGen · LlamaIndex — wrap the CLI/JSON as a tool in one line
• CI / scripts — exit codes + SARIF for non-AI pipelines

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How it compares

	Cognis canzap	caringcaribou + can-utils
Self-hostable, no account	✅	varies
Single command, zero config	✅	⚠️
JSON + SARIF for CI	✅	varies
MCP-native (AI agents)	✅	❌
Polyglot ports (JS/Go/Rust)	✅	❌
Open license	✅ COCL	varies

Built in the spirit of caringcaribou + can-utils, re-framed the Cognis way. Missing a credit? Open a PR.

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Integrations

Pipes into your stack: SARIF for code-scanning, JSON for anything, an MCP server (canzap mcp) for AI agents, and a webhook forwarder for SIEM/Slack/Jira. See docs/INTEGRATIONS.md.

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Install — every way, every platform

pip install "git+https://github.com/cognis-digital/canzap.git"    # pip (works today)
pipx install "git+https://github.com/cognis-digital/canzap.git"   # isolated CLI
uv tool install "git+https://github.com/cognis-digital/canzap.git" # uv
pip install cognis-canzap                                          # PyPI (when published)
docker run --rm ghcr.io/cognis-digital/canzap:latest --help        # Docker
brew install cognis-digital/tap/canzap                             # Homebrew tap
curl -fsSL https://raw.githubusercontent.com/cognis-digital/canzap/main/install.sh | sh

Linux	macOS	Windows	Docker	Cloud
scripts/setup-linux.sh	scripts/setup-macos.sh	scripts/setup-windows.ps1	docker run ghcr.io/cognis-digital/canzap	DEPLOY.md (AWS/Azure/GCP/k8s)

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Related Cognis tools

• fwxray — Diff two firmware images and surface exactly what changed: new binaries, flipped config flags, added certs, and shifted entropy regions.
• sbomb — Generate a CycloneDX SBOM directly from an unpacked firmware root filesystem and flag components with known CVEs and EOL kernels.
• mqttspy — Passively map an MQTT broker: enumerate topics, detect unauthenticated writes, spot PII/secrets in payloads, and emit a risk report.
• uefiscan — Audit UEFI firmware dumps for missing Secure Boot keys, unsigned modules, S3 boot-script vulns, and known SMM threats.
• modpot — Spin up a high-interaction Modbus/DNP3 ICS honeypot that logs attacker register reads/writes as structured JSON.
• keyhunt — Scan firmware blobs and filesystem dumps for hardcoded private keys, API tokens, default creds, and weak RSA/ECC material.

Explore the suite → 🗂️ all 170+ tools · ⭐ awesome-cognis · 🔗 cognis-sources · 🤖 uncensored-fleet · 🧠 engram

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Contributing

PRs, new rules, and demo scenarios are welcome under the collaboration-pull model — see CONTRIBUTING.md and SECURITY.md.

⭐ If canzap saved you time, star it — it genuinely helps others find it.

Interoperability

{} composes with the 300+ tool Cognis suite — JSON in/out and a shared OpenAI-compatible /v1 backbone. See INTEROP.md for the suite map, composition patterns, and reference stacks.

License

Source-available under the Cognis Open Collaboration License (COCL) v1.0 — free for personal, internal-evaluation, research, and educational use; commercial / production use requires a license ([email protected]). See LICENSE.

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_{Cognis Digital · one of 170+ tools in the Cognis Neural Suite · Making Tomorrow Better Today}