docs: Add comprehensive build documentation for CrowdSec Firewall Bouncer binary

Added BUILD.md with complete guide for building the real crowdsec-firewall-bouncer
binary package from upstream OpenWrt feeds using the SDK.

Documentation includes:
- Build environment setup (SDK, golang, feeds)
- Step-by-step build process with commands
- Package details (binary size, architecture, Go version)
- Deployment instructions for router installation
- Integration with secubox-app-crowdsec-bouncer wrapper
- Version update procedures
- Troubleshooting common build issues
- CI/CD integration examples

Successfully Built Package:
- Version: 0.0.31-r2
- Architecture: aarch64_cortex-a72
- Size: 4.9MB compressed, 14MB binary
- Go Version: 1.23.12
- Build Time: ~52 seconds

The binary package was successfully built and deployed to router 192.168.8.191:
- Service running and active
- Last API pull: 2026-01-06T19:49:45Z
- nftables tables created and operational
- Integration with CrowdSec LAPI confirmed

Build Command:
```
cd secubox-tools/sdk
./scripts/feeds install -p packages golang
./scripts/feeds install crowdsec-firewall-bouncer
make package/feeds/packages/crowdsec-firewall-bouncer/compile V=s -j1
```

Output: bin/packages/aarch64_cortex-a72/packages/crowdsec-firewall-bouncer_0.0.31-r2_aarch64_cortex-a72.ipk

This provides complete control over the binary version and enables self-contained
deployment without relying on external pre-built binaries.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
CyberMind-FR 2026-01-06 20:51:24 +01:00
parent 82d1aa37aa
commit 6bd2914730

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# Building CrowdSec Firewall Bouncer Binary
This document explains how to build the real `crowdsec-firewall-bouncer` binary package from the upstream OpenWrt feeds.
## Overview
The `secubox-app-crowdsec-bouncer` package is a lightweight wrapper that provides enhanced configuration and auto-registration. However, it depends on the actual binary package `crowdsec-firewall-bouncer` which must be built separately.
## Build Environment
- **OpenWrt SDK**: Version 24.10.5
- **Architecture**: aarch64_cortex-a72 (MOCHAbin platform)
- **Build System**: OpenWrt SDK with golang support
- **Source**: GitHub `crowdsecurity/cs-firewall-bouncer` v0.0.31
## Prerequisites
1. OpenWrt SDK set up at `secubox-tools/sdk/`
2. Feeds updated (packages feed must be available)
3. Golang build dependencies installed
## Build Process
### Step 1: Install Golang Dependencies
```bash
cd secubox-tools/sdk
./scripts/feeds install -p packages golang
```
This installs the Go compiler and build framework needed for cross-compilation.
### Step 2: Install Package from Feed
```bash
./scripts/feeds install crowdsec-firewall-bouncer
```
This creates a symlink in `package/feeds/packages/crowdsec-firewall-bouncer/` pointing to the upstream package in `feeds/packages/net/crowdsec-firewall-bouncer/`.
### Step 3: Build Package
```bash
make package/feeds/packages/crowdsec-firewall-bouncer/compile V=s -j1
```
Build options:
- `V=s`: Verbose output (useful for debugging)
- `-j1`: Single-threaded build (more stable for Go compilation)
Build time: ~50-60 seconds on a modern system
### Step 4: Locate Built Package
The IPK package is created at:
```
bin/packages/aarch64_cortex-a72/packages/crowdsec-firewall-bouncer_0.0.31-r2_aarch64_cortex-a72.ipk
```
## Package Details
### Binary Information
- **Size**: ~4.9MB (compressed IPK), ~14MB (binary)
- **Binary Path**: `/usr/bin/cs-firewall-bouncer`
- **Architecture**: ELF 64-bit LSB executable, ARM aarch64
- **Linked**: Dynamically linked with musl libc
- **Go Version**: 1.23.12
- **Stripped**: Yes (to reduce size)
### Package Contents
- Binary: `/usr/bin/cs-firewall-bouncer`
- Init Script: `/etc/init.d/crowdsec-firewall-bouncer`
- Config Template: `/etc/config/crowdsec`
## Deployment
### Upload to Router
```bash
scp bin/packages/aarch64_cortex-a72/packages/crowdsec-firewall-bouncer_0.0.31-r2_aarch64_cortex-a72.ipk root@192.168.8.191:/tmp/
```
### Install on Router
```bash
ssh root@192.168.8.191
opkg install --force-reinstall /tmp/crowdsec-firewall-bouncer_0.0.31-r2_aarch64_cortex-a72.ipk
```
Use `--force-reinstall` to upgrade existing installations.
### Verify Installation
```bash
/usr/bin/cs-firewall-bouncer --version
/etc/init.d/crowdsec-firewall-bouncer restart
cscli bouncers list
```
Expected output:
- Service running
- Active API pulls to CrowdSec LAPI
- nftables tables created (crowdsec, crowdsec6)
## Integration with SecuBox Wrapper
The `secubox-app-crowdsec-bouncer` wrapper package:
1. Depends on `+crowdsec-firewall-bouncer` (this binary package)
2. Provides enhanced UCI configuration with router-optimized defaults
3. Adds automatic API key registration via uci-defaults script
4. Configures network interfaces automatically
When installed together:
```bash
opkg install crowdsec-firewall-bouncer_*.ipk
opkg install secubox-app-crowdsec-bouncer_*.ipk
```
The wrapper will detect the binary and configure it automatically.
## Updating to Newer Versions
When upstream releases a new version:
1. Update feeds:
```bash
./scripts/feeds update packages
```
2. Check new version:
```bash
cat feeds/packages/net/crowdsec-firewall-bouncer/Makefile | grep PKG_VERSION
```
3. Rebuild:
```bash
make package/feeds/packages/crowdsec-firewall-bouncer/clean
make package/feeds/packages/crowdsec-firewall-bouncer/compile V=s -j1
```
4. Test on router before deploying to production
## Troubleshooting
### Build Fails - Golang Not Found
**Solution**: Install golang dependencies first
```bash
./scripts/feeds install -a -f golang
```
### Out of Memory During Build
**Solution**: Ensure at least 2GB RAM available or use swap
```bash
free -h # Check memory
```
### Download Timeout
**Solution**: Manually download source
```bash
cd dl/
wget https://codeload.github.com/crowdsecurity/cs-firewall-bouncer/tar.gz/v0.0.31 -O cs-firewall-bouncer-0.0.31.tar.gz
cd ..
make package/feeds/packages/crowdsec-firewall-bouncer/compile V=s
```
### Binary Size Too Large
This is expected - Go binaries include the runtime and dependencies. The 14MB binary is normal for a Go application with networking and nftables integration.
## Build System Details
The build process:
1. Downloads source from GitHub
2. Verifies SHA256 checksum
3. Sets up Go workspace with proper GOPATH
4. Downloads Go module dependencies
5. Cross-compiles using OpenWrt toolchain
6. Injects version info via LDFLAGS
7. Strips binary symbols
8. Creates IPK package with control files
Go build flags:
```makefile
GO_PKG_LDFLAGS_X:=
github.com/crowdsecurity/cs-firewall-bouncer/pkg/version.Version=v0.0.31
github.com/crowdsecurity/cs-firewall-bouncer/pkg/version.BuildDate=<timestamp>
github.com/crowdsecurity/cs-firewall-bouncer/pkg/version.Tag=openwrt-0.0.31-2
github.com/crowdsecurity/cs-firewall-bouncer/pkg/version.GoVersion=1.23.12
```
## CI/CD Integration
For GitHub Actions or automated builds:
```yaml
- name: Build CrowdSec Firewall Bouncer
run: |
cd secubox-tools/sdk
./scripts/feeds install -p packages golang
./scripts/feeds install crowdsec-firewall-bouncer
make package/feeds/packages/crowdsec-firewall-bouncer/compile V=s -j$(nproc)
- name: Upload Package
uses: actions/upload-artifact@v3
with:
name: crowdsec-firewall-bouncer
path: bin/packages/aarch64_cortex-a72/packages/crowdsec-firewall-bouncer_*.ipk
```
## Version History
- **0.0.31-r2** (2026-01-06): First build with OpenWrt SDK, Go 1.23.12
- Built from upstream: `https://github.com/crowdsecurity/cs-firewall-bouncer/releases/tag/v0.0.31`
## References
- Upstream Package: `secubox-tools/sdk/feeds/packages/net/crowdsec-firewall-bouncer/`
- OpenWrt Golang Framework: `feeds/packages/lang/golang/golang-package.mk`
- CrowdSec Documentation: https://docs.crowdsec.net/
- Firewall Bouncer Repo: https://github.com/crowdsecurity/cs-firewall-bouncer