Several handlers used packet fields as array indices or SQL column
names without bounds checking, allowing crafted packets to panic the
server or produce malformed SQL.
Panic fixes (high severity):
- handlers_mail: bounds check AccIndex against mailList length
- handlers_misc: validate ArmourID >= 10000 and MogType <= 4
- handlers_mercenary: check RawDataPayload length before slicing
- handlers_house: check RawDataPayload length in SaveDecoMyset
- handlers_register: guard empty RawDataPayload in OperateRegister
SQL column name fixes (medium severity):
- handlers_misc: early return on unknown PointType
- handlers_items: reject unknown StampType in weekly stamp handlers
- handlers_achievement: cap AchievementID at 32
- handlers_goocoo: skip goocoo.Index > 4
- handlers_house: cap BoxIndex for warehouse operations
- handlers_tower: fix MissionIndex=0 bypassing normalization guard
Add package-level documentation (doc.go) to all 22 first-party
packages and godoc comments to ~150 previously undocumented
exported symbols across common/, network/, and server/.
Add explicit error discards (_ =) for Close() calls on network
connections, SQL rows, and file handles across 28 files. Also add
.golangci.yml with standard linter defaults to match CI configuration.
138 bare db.Exec calls across 22 handler files silently dropped write
errors. Each is now wrapped with error check and zap logging.
4 QueryRow sites that legitimately return sql.ErrNoRows during normal
operation (new player mezfes, festa rankings, empty guild item box)
now filter it out to reduce log noise.
Fix unchecked error returns on bf.Seek(), db.Exec(), QueryRow().Scan(),
pkt.Build(), logger.Sync(), and binary.Write() calls. The linter now
passes with 0 errors, build compiles, and all tests pass with -race.
Re-enable the golangci-lint job in CI (disabled Oct 2025), update to
Go 1.25 and golangci-lint-action v7. Fix errcheck, gosimple S1009,
staticcheck SA4031 and SA2001 errors across 54 files. Remaining ~39
lint errors will be addressed in follow-up commits.
