docs(01-01): complete bootstrap and protocol classification plan
- Add 01-01-SUMMARY.md documenting outcomes, commits, and decisions - STATE.md: advance to plan 2/4, record metrics, add key decisions - ROADMAP.md: update phase 1 progress (1/4 plans complete) - REQUIREMENTS.md: mark CLAS-01 complete
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phase: 01-capture-and-classification
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plan: 01
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subsystem: classification
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tags: [go, gopacket, protocol-classification, tdd, packet-capture]
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# Dependency graph
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requires: []
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provides:
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- "Go 1.24.1 module initialized (github.com/netsynth/netsynth)"
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- "classify/types.go: TrafficClass (11 constants), ClassifiedPacket, WindowSnapshot shared types"
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- "classify/rules.go: Rule struct and DefaultRules slice with 12 ordered protocol rules"
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- "classify/classifier.go: Classifier with NewClassifier and Classify(gopacket.Packet) methods"
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- "Unit tests for all 11 traffic classes, 14 test cases, all passing"
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affects:
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- 01-capture-and-classification
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- 02-audio-synthesis
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- 03-clustering
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# Tech tracking
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tech-stack:
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added:
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- "github.com/gopacket/gopacket v1.5.0 — packet decode and layer type assertions"
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- "github.com/packetcap/go-pcap v0.0.0-20251215 — in go.sum for Phase 1 capture plan"
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- "github.com/spf13/cobra v1.10.2 — in go.sum for Phase 1 CLI plan"
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patterns:
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- "Config-driven rule slice (not switch) for classification — per D-02"
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- "First-match-wins rule evaluation over ordered []Rule slice"
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- "Classifier struct accepting rules at construction for testability"
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- "test package (classify_test) using gopacket SerializeLayers for synthetic packet construction"
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key-files:
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created:
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- "classify/types.go — TrafficClass, ClassifiedPacket, WindowSnapshot shared contracts"
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- "classify/rules.go — Rule struct, DefaultRules with 12 ordered protocol rules"
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- "classify/classifier.go — Classifier, NewClassifier, Classify method"
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- "classify/classifier_test.go — 14 test cases covering all 11 traffic classes"
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- "go.mod — module github.com/netsynth/netsynth, go 1.24.1"
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- "go.sum — all dependency checksums"
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modified: []
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key-decisions:
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- "Go installed at /home/dev/tools/go-install/go (no sudo available) — export PATH=$PATH:/home/dev/tools/go-install/go/bin required"
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- "DefaultRules uses ordered slice with DstPort=0 as catch-all — enables first-match-wins without switch"
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- "ICMP checked before TCP/UDP in Classify to handle ICMP packets that decode no port"
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- "go mod tidy removes go-pcap and cobra from go.mod until they are imported in later plans"
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patterns-established:
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- "Classifier struct pattern: NewClassifier(rules []Rule) accepts rules at construction, enabling custom rules in tests"
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- "Synthetic packet construction: gopacket SerializeLayers with Ethernet+IPv4+TCP/UDP/ICMP layers"
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requirements-completed: [CLAS-01]
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# Metrics
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duration: 4min
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completed: 2026-03-25
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---
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# Phase 01 Plan 01: Bootstrap and Protocol Classification Engine Summary
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**Config-driven packet classifier with 12 protocol rules identifying ICMP, DNS, HTTPS, HTTP, SSH, SMTP, NTP, DHCP, other-TCP, other-UDP, and unknown traffic via ordered []Rule slice**
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## Performance
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- **Duration:** 4 min
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- **Started:** 2026-03-25T11:09:11Z
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- **Completed:** 2026-03-25T11:13:13Z
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- **Tasks:** 2
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- **Files modified:** 6
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## Accomplishments
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- Go 1.24.1 installed and module initialized with gopacket, go-pcap, and cobra dependencies
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- 11 TrafficClass constants + ClassifiedPacket + WindowSnapshot types established as shared contracts for all downstream phases
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- Config-driven classifier (no switch) with 12 ordered rules; first-match-wins; ICMP handled separately from TCP/UDP port matching
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- All 14 TDD tests pass covering all 11 traffic classes and rule ordering behavior
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Install Go 1.24, initialize module, create shared types** - `15e8143` (feat)
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2. **Task 2 RED: Failing tests for all 11 protocol classes** - `f233e80` (test)
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3. **Task 2 GREEN: Config-driven classifier implementation** - `48ef6e5` (feat)
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4. **Task 2 TIDY: go mod tidy after imports added** - `25e0dc3` (chore)
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_Note: TDD task had test commit (RED) then feat commit (GREEN), plus a tidy cleanup._
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## Files Created/Modified
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- `classify/types.go` - TrafficClass (11 constants), ClassifiedPacket, WindowSnapshot, AllClasses()
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- `classify/rules.go` - Rule struct, DefaultRules slice with 12 ordered protocol rules
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- `classify/classifier.go` - Classifier struct, NewClassifier, Classify method (no switch)
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- `classify/classifier_test.go` - 14 test cases, 243 lines, all protocol classes covered
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- `go.mod` - Module github.com/netsynth/netsynth, go 1.24.1, gopacket direct dep
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- `go.sum` - All dependency checksums including go-pcap and cobra for future plans
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## Decisions Made
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- Go installed to `/home/dev/tools/go-install/go` (not /usr/local — no sudo access); PATH export needed in each shell session
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- ICMP classification checked before TCP/UDP since ICMP has no ports — avoids the "no transport layer" fallthrough for valid ICMP packets
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- `go mod tidy` trimmed go-pcap and cobra to indirect/removed since they have no code importing them yet; they will be re-added as direct deps when capture and CLI plans import them
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## Deviations from Plan
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None - plan executed exactly as written. The only operational difference was installing Go to `/home/dev/tools/go-install/go` instead of `/usr/local/go` due to lack of sudo access — functionality is identical.
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## Issues Encountered
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- No sudo access — Go 1.24.1 installed to `/home/dev/tools/go-install/go` instead of `/usr/local/go`. PATH must include `/home/dev/tools/go-install/go/bin` in each session.
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- `go mod tidy` removes go-pcap and cobra from go.mod when no code imports them. This is expected Go behavior; these dependencies will become direct when imported in Plans 02-04.
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## User Setup Required
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None - no external service configuration required. Note that running `go` commands requires:
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```
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export PATH=$PATH:/home/dev/tools/go-install/go/bin
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```
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## Next Phase Readiness
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- classify package is complete and compiles; all types are stable contracts for downstream phases
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- Plan 01-02 (capture pipeline) can import classify and start building on top of ClassifiedPacket/WindowSnapshot
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- Plan 01-03 (aggregation) can import WindowSnapshot directly
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- No blockers
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---
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*Phase: 01-capture-and-classification*
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*Completed: 2026-03-25*
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