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IDProjectCategoryView StatusDate SubmittedLast Update
0003369Doomseeker[All Projects] Bugpublic2018-02-10 03:282018-02-15 18:15
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PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
Summary0003369: Wadseeker desperately needs a way to compare downloaded wads to wads being requested by server
DescriptionOn multiple occasions Wadseeker has downloaded incorrect files which are modified but have the same name across multiple websites. It makes little sense that the game should launch with incorrect files.
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User avatar (0019027)
Korshun (reporter)
2018-02-10 12:59
edited on: 2018-02-10 13:05

How would it do that if Zandronum servers don't publish wad hashes until you've tried to connect?

How about making Zandronum servers publish a list of wad hashes along with wad names? According to [^] , introducing SQF_PWADHASHES won't break backwards compatibility.

EDIT: the comma breaks the URL.

EDIT2: publishing wad hashes would also allow directly querying for wads by hash, instead of downloading by name and verifying using the hash. [^] has that functionality and can provide many download links for any wad hash, but I haven't seen any other places that allow querying by wad hash.

User avatar (0019028)
Blzut3 (administrator)
2018-02-10 21:53

For some reason I thought we already added hashes to the protocol, but don't see it in the source (probably was thinking of SQF_DATA_MD5SUM which is no longer used). In any case though Odamex already exposes thing information so it could be made part of our API today.
User avatar (0019029)
Zalewa (developer)
2018-02-11 09:30

If we could recognize hosted WADs by hash and download them by this hash, there still would remain a problem of having duplicate WADs on disk.

In "ye olde" times, especially when it was about WADs designed for multiplayer, the creators were usually aware of the duplicated WADs problem and incorporated WAD's version number in to the WAD's file name. It was simple: you changed something in the WAD, then you also changed its name and, thanks to this, there were no incompatible "duplicates" being hosted over different servers. I can understand keeping the same filename when the WAD is designed for single player, but if the author claims "multiplayer: designed for" then the author should be aware how big of a problem it is to release an incompatible version with the same name.

However, let's assume that the server browser can differentiate WADs by hashes. It also detects that the user, in their "WAD downloads" directory, already has the WAD with the same name. What should it do?

a) Tell the user that there's a duplicate and let them choose to overwrite or cancel the download, optionally allowing to ignore the problem? In the last case the issue or pressing "Ignore" all the time will become annoying.

b) Incorporate the hash into the duplicated WAD's filename when it's downloaded? If we see "mod.wad" but hash mismatches we can always look for "mod_abcdef1234567890hashishash.wad". If that is not found we can always ask to download & rename.
User avatar (0019030)
Blzut3 (administrator)
2018-02-11 09:55

At the very least supporting checking the hash if the plugin supports it and telling the user that there's a mismatch before launching would be useful.

I don't think HTTP provides any standardized way of asking for a content match by hash, so as far as fetching goes outside of something like wad-archive I think the only option is to get a full list of URLs and try them one by one until a match is found. Off hand the only thing we could possibly do to improve that is implement a custom header that hosts could choose to do something with, but I wouldn't expect any sizable number of servers to comply. (Web browser caching relies on the "Etag" header which appears to be an arbitrary server side value so not useful to us.)

I like your idea on auto-renaming files with the hash if there's a duplicate. My initial thought was to just blindly overwrite (assuming the user accepts the usual "would you like to download" dialog), but that sounds like it would be fairly easy to implement and solve the problem nicely.

From the impression I got when Marcaek when he told me of the issue I would assume the bigger problem is Wadseeker picking the wrong version for people without any version of the wad since an older version happens to be hosted on one of our default locations. With that in mind having Wadseeker hash check and reject would be useful even if the duplicate problem isn't solved.
User avatar (0019032)
WubTheCaptain (developer)
2018-02-12 22:14

Is the future of Wadseeker to be a WAD downloader or a WAD (file) manager? In Doomseeker (a server browser)?
User avatar (0019033)
Blzut3 (administrator)
2018-02-13 04:01

Not sure where your question comes from. The goal is to get people into servers with the right wads loaded in the case of Doomseeker. For Wadseeker it to find and download the correct wad.
User avatar (0019055)
WubTheCaptain (developer)
2018-02-15 18:15

Quote from Blzut3
The goal is to get people into servers with the right wads loaded in the case of Doomseeker. For Wadseeker it to find and download the correct wad.

Oh sorry, I was thinking a bit naively. I'm inclined to support this, then.

Issue Community Support
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Supporters: Korshun Zalewa WubTheCaptain
Opponents: No one explicitly opposes this issue yet.

- Issue History
Date Modified Username Field Change
2018-02-10 03:28 Marcaek New Issue
2018-02-10 12:59 Korshun Note Added: 0019027
2018-02-10 13:00 Korshun Note Edited: 0019027 View Revisions
2018-02-10 13:05 Korshun Note Edited: 0019027 View Revisions
2018-02-10 21:53 Blzut3 Note Added: 0019028
2018-02-11 05:08 Blzut3 Project Zandronum => Doomseeker
2018-02-11 09:30 Zalewa Note Added: 0019029
2018-02-11 09:55 Blzut3 Note Added: 0019030
2018-02-12 22:12 WubTheCaptain Severity major => feature
2018-02-12 22:12 WubTheCaptain Status new => acknowledged
2018-02-12 22:12 WubTheCaptain Product Version 3.0 =>
2018-02-12 22:14 WubTheCaptain Note Added: 0019032
2018-02-13 04:01 Blzut3 Note Added: 0019033
2018-02-15 18:15 WubTheCaptain Note Added: 0019055

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