yoloyolo/.planning/phases/01-capture-and-classification/01-01-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
01-capture-and-classification	01	classification	go gopacket protocol-classification tdd packet-capture		Go 1.24.1 module initialized (github.com/netsynth/netsynth) classify/types.go: TrafficClass (11 constants), ClassifiedPacket, WindowSnapshot shared types classify/rules.go: Rule struct and DefaultRules slice with 12 ordered protocol rules classify/classifier.go: Classifier with NewClassifier and Classify(gopacket.Packet) methods Unit tests for all 11 traffic classes, 14 test cases, all passing	01-capture-and-classification 02-audio-synthesis 03-clustering	added patterns github.com/gopacket/gopacket v1.5.0 — packet decode and layer type assertions github.com/packetcap/go-pcap v0.0.0-20251215 — in go.sum for Phase 1 capture plan github.com/spf13/cobra v1.10.2 — in go.sum for Phase 1 CLI plan Config-driven rule slice (not switch) for classification — per D-02 First-match-wins rule evaluation over ordered []Rule slice Classifier struct accepting rules at construction for testability test package (classify_test) using gopacket SerializeLayers for synthetic packet construction	created modified classify/types.go — TrafficClass, ClassifiedPacket, WindowSnapshot shared contracts classify/rules.go — Rule struct, DefaultRules with 12 ordered protocol rules classify/classifier.go — Classifier, NewClassifier, Classify method classify/classifier_test.go — 14 test cases covering all 11 traffic classes go.mod — module github.com/netsynth/netsynth, go 1.24.1 go.sum — all dependency checksums	Go installed at /home/dev/tools/go-install/go (no sudo available) — export PATH=$PATH:/home/dev/tools/go-install/go/bin required DefaultRules uses ordered slice with DstPort=0 as catch-all — enables first-match-wins without switch ICMP checked before TCP/UDP in Classify to handle ICMP packets that decode no port go mod tidy removes go-pcap and cobra from go.mod until they are imported in later plans	Classifier struct pattern: NewClassifier(rules []Rule) accepts rules at construction, enabling custom rules in tests Synthetic packet construction: gopacket SerializeLayers with Ethernet+IPv4+TCP/UDP/ICMP layers	CLAS-01	4min	2026-03-25

Phase 01 Plan 01: Bootstrap and Protocol Classification Engine Summary

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

Performance

• Duration: 4 min
• Started: 2026-03-25T11:09:11Z
• Completed: 2026-03-25T11:13:13Z
• Tasks: 2
• Files modified: 6

Accomplishments

• Go 1.24.1 installed and module initialized with gopacket, go-pcap, and cobra dependencies
• 11 TrafficClass constants + ClassifiedPacket + WindowSnapshot types established as shared contracts for all downstream phases
• Config-driven classifier (no switch) with 12 ordered rules; first-match-wins; ICMP handled separately from TCP/UDP port matching
• All 14 TDD tests pass covering all 11 traffic classes and rule ordering behavior

Task Commits

Each task was committed atomically:

1. Task 1: Install Go 1.24, initialize module, create shared types - 15e8143 (feat)
2. Task 2 RED: Failing tests for all 11 protocol classes - f233e80 (test)
3. Task 2 GREEN: Config-driven classifier implementation - 48ef6e5 (feat)
4. Task 2 TIDY: go mod tidy after imports added - 25e0dc3 (chore)

Note: TDD task had test commit (RED) then feat commit (GREEN), plus a tidy cleanup.

Files Created/Modified

• classify/types.go - TrafficClass (11 constants), ClassifiedPacket, WindowSnapshot, AllClasses()
• classify/rules.go - Rule struct, DefaultRules slice with 12 ordered protocol rules
• classify/classifier.go - Classifier struct, NewClassifier, Classify method (no switch)
• classify/classifier_test.go - 14 test cases, 243 lines, all protocol classes covered
• go.mod - Module github.com/netsynth/netsynth, go 1.24.1, gopacket direct dep
• go.sum - All dependency checksums including go-pcap and cobra for future plans

Decisions Made

• Go installed to /home/dev/tools/go-install/go (not /usr/local — no sudo access); PATH export needed in each shell session
• ICMP classification checked before TCP/UDP since ICMP has no ports — avoids the "no transport layer" fallthrough for valid ICMP packets
• 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

Deviations from Plan

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.

Issues Encountered

• 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.
• 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.

User Setup Required

None - no external service configuration required. Note that running go commands requires:

export PATH=$PATH:/home/dev/tools/go-install/go/bin

Next Phase Readiness

• classify package is complete and compiles; all types are stable contracts for downstream phases
• Plan 01-02 (capture pipeline) can import classify and start building on top of ClassifiedPacket/WindowSnapshot
• Plan 01-03 (aggregation) can import WindowSnapshot directly
• No blockers

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Phase: 01-capture-and-classification Completed: 2026-03-25