Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
86df62fd3e
## Summary
Players could not place **any door** while customizing a house, and placing other pieces could disconnect them outright. Staff saw neither problem: `HouseFoundation.Designer_Build` only enforces `ValidPiece` below `GameMaster`.
Original report and diagnosis by @SynPDX.
## Root cause 1 — no door is ever registered
The retail client's `doors.txt` separates its header rows with lines of **bare tabs** (it is the only sheet that does):
```
int<TAB>int<TAB>...<TAB>string
<TAB><TAB><TAB><TAB><TAB><TAB><TAB><TAB><TAB><TAB> <-- 10 tabs, not an empty line
Category<TAB>Piece1<TAB>...<TAB>FeatureMask<TAB>Comment
<TAB><TAB><TAB><TAB><TAB><TAB><TAB><TAB><TAB><TAB>
0<TAB>1657<TAB>1659<TAB>...
```
`Spreadsheet.ReadLine` skipped a line only when `line.Length > 0`. A 10-tab line has length 10, so it was returned as the **names row** — every column ended up named `""`, `GetColumnID("Piece1")` and friends returned `-1`, and not one of the 230 door graphics was registered. Unregistered item IDs keep the `-1` sentinel, and `CheckValidity` rejects those, so `ValidPiece` refused every door.
ClassicUO skips these lines (`string.IsNullOrWhiteSpace` in `HouseCustomizationManager.ParseFile`), which is why the client happily offers doors the server then rejects.
Measured against a retail 7.0.x `doors.txt` using the shipped `Spreadsheet`:
| | `FeatureMask` column | door graphics registered |
|---|---|---|
| before | `-1` | **0** |
| after | `9` | **230** |
## Root cause 2 — `IndexOutOfRangeException` out of the packet handler
Every sheet ends in a cosmetic `Comment` column that ModernUO never reads, and client sheets write an empty comment as a plain newline with no trailing tab. `Split('\t')` then returns one field fewer than the header declares, and the parser indexed past the end:
```
System.IndexOutOfRangeException: Index was outside the bounds of the array.
at Server.Multis.Spreadsheet..ctor(String path)
at Server.Multis.ComponentVerification.LoadSpreadsheet(...)
at Server.Multis.ComponentVerification.IsItemValid(Int32 itemID)
at Server.Multis.HouseFoundation.ValidPiece(Int32 itemID, Boolean roof)
at Server.Multis.HouseFoundation.Designer_Build(NetState state, ...)
```
The client's own parser only requires the columns up to `FeatureMask` — ClassicUO's `CustomHouseMisc.Parse` guards on `scanf.Length >= 12` for a 13-column `misc.txt` — so such a row is valid data listing real pieces. Missing trailing fields are now treated as empty rather than dropping the row, which would unregister every piece the row lists and reproduce the door symptom.
`EnsureLoaded` also set `_loaded` before loading, so once the throw escaped, an all `-1` table stayed cached and rejected everything for players from then on — the same player-visible symptom as #2500.
## Also made explicit rather than accidental
- **Named the table sentinels.** `NotAComponent` (-1) is the anti-cheat guard and the initial state; `NoFeatureRequired` (0) is a piece with no expansion gate — how `walls.txt` encodes pre-AOS base pieces and what `housing.bin` collapses to under `HousingTierMask` (#2500).
- **A sheet with no `FeatureMask` column is refused and logged.** `GetInt32` on a missing column returns 0 = `NoFeatureRequired`, which would have silently marked every piece in that sheet unconditionally placeable regardless of expansion. This was previously only harmless by accident.
- **A sheet matching none of its expected tile columns is refused and logged** — that is what `doors.txt` was doing silently. Individual missing columns stay tolerated, since older sheets predate columns such as `walls.txt`'s `SecondAltWindowS`/`E`.
- **Catch per sheet**, so one unreadable file no longer costs the other six.
- **Header guards**: an empty file or a types-only file raised a `NullReferenceException`; a names row shorter than the types row indexed past the end.
- **Fall back to the component sheets when `housing.bin` cannot be read**, instead of passing `null` into a `SpanReader`.
`_loaded` is still set before loading, deliberately: this runs from the design packet handler, and retrying would re-read every sheet on each subsequent placement attempt.
Sheet precedence is **unchanged** — the client's copies stay authoritative and `Data/Components` remains the fallback.
## Verification
- Retail 7.0.x client `doors.txt` through the shipped `Spreadsheet`: 0 door graphics before, 230 after.
- 5 new tests in `SpreadsheetTests` covering the tab separators, the omitted trailing field, per-row recovery, and both header guards. All 5 fail against `main` and pass here.
- `dotnet build` clean (0 warnings, 0 errors); `UOContent.Tests` 642/642.
|
||
|---|---|---|
| .config | ||
| .github | ||
| branding | ||
| dev-docs | ||
| Distribution/Data | ||
| Projects | ||
| tools | ||
| .cursorrules | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| AGENTS.md | ||
| azure-pipelines.yml | ||
| CLAUDE.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| GEMINI.md | ||
| global.json | ||
| LICENSE | ||
| ModernUO.slnx | ||
| publish.cmd | ||
| publish.ps1 | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
| stylecop.json | ||
| THIRD-PARTY-NOTICES | ||
| version.json | ||
ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
Interactive Mode (Recommended for new users)
Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:
- Check prerequisites (.NET SDK, native libraries)
- Walk you through configuration and platform selection
- Build and publish the server to the
Distributiondirectory - Show deployment instructions for cross-compiled builds
Command Line
./publish.cmd [release|debug] [os] [arch]
os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit
Linux Prerequisites
Fedora, CentOS, RHEL, AlmaLinux, Rocky, etc
dnf upgrade --refresh -y
# RHEL-family distributions (CentOS Stream, AlmaLinux, Rocky, RHEL) need CRB and EPEL enabled.
# Fedora skips this block.
dnf install -y dnf-plugins-core
dnf config-manager --set-enabled crb
dnf install -y epel-release
# Prerequisites
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel liburing-devel
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev
OSX Requirements
brew install icu4c libdeflate zstd argon2
Running the Server
- Follow the publish instructions
- The
Distributiondirectory is portable — copy it to your production server for deployment - Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory - On first run, the server will prompt you to configure game data file locations
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community
Development Tools & Plugins provided with ♥ by
Code Signing Policy
Free code signing provided by SignPath.io, certificate by SignPath Foundation.
This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it
Teams & Roles
Approvers & Committers: Development Team