BitTorrent errorCode=26 Detected directory traversal directive

[SumatraPeter]

I've got a bunch of .torrent files that aria2 simply won't download, or even print the file list of with -S. For each one I get an error similar to the following:

Exception: [bittorrent_helper.cc:277] errorCode=26 Detected directory traversal directive in MTCDC From Z to A 012 Stz-Star S/Star Trek/Icon

What gives? I don't know what makes that 0 (zero) byte "Icon" or "Icon_" file problematic, but I have no issues opening or downloading the torrent or even skipping that file with a client like uTorrent for example:

I'm also attaching one of the problematic .torrent files below. If you need more of the same do let me know.

Problem_Torrent.zip

[anson2416]

I met the same issue.

[SumatraPeter]

I'm not sure whether this program is even being maintained/updated now. :(

[zzzhr1990]

the same problem.
magnet:?xt=urn:btih:645F8207DF3A5AB56CF74BDD839303B228CBC83C&dn=SKMJ053mp4

[SumatraPeter]

@zzzhr1990: Confirmed with your torrent, and here it is in case some developer is ever interested in fixing this bug one day...

Problem_Torrent_2.zip

@tatsuhiro-t @nmaier Any chance of getting this bug fixed? 🙂

[zzzhr1990]

@zzzhr1990: Confirmed with your torrent, and here it is in case some developer is ever interested in fixing this bug one day...
Problem_Torrent_2.zip
@tatsuhiro-t @nmaier Any chance of getting this bug fixed? 🙂

Well, there's something wrong with this torrent file:
magnet:?xt=urn:btih:645F8207DF3A5AB56CF74BDD839303B228CBC83C&dn=SKMJ053mp4
one of the filename in metata ends up '/' (empty directory)
so util::detectDirTraversal(utf8Name) returns false.
in src/bittorrent_helper.cc line 275, can we just ignore this file instead of throw error?

[zzzhr1990]

Well, there's something wrong with this torrent file

@zzzhr1990: Perhaps English is not your first language. As I said above, I have confirmed that the torrent you mentioned does exhibit the same "errorCode=26 Detected directory traversal directive" bug, and thus I have downloaded and attached the torrent with my previous comment. Now it is up to an aria2 dev to actually study these torrents and fix the issue.

sorry, I changed my comment, one of the filename in metdata ends up '/' (empty directory), the cause error 26. can we just ignore this illegal filename and continue add extractFileEntries loop?

[SumatraPeter]

one of the filename in metdata ends up '/' (empty directory), the cause error 26

I am not a dev so cannot say for sure whether the cause is the same with my torrent too (attached above in Problem_Torrent.zip). Given that the same error is thrown, perhaps yes...

can we just ignore this illegal filename and continue add extractFileEntries loop?

Whatever way this bug is fixed is fine with me. 🙂 As torrent clients like uTorrent have been able to successfully handle such torrents for years now (even ancient versions don't throw an error), I expect the same sort of robustness with aria2 as well. Simply throwing an error 26 and aborting is not the sort of behavior I expect from an otherwise fine utility like this!

[DebuAqua]

I met the same issue.
Is it possible to let aria2 skip the problematic file and proceed to downloading?

[SumatraPeter]

Unfortunately this seems to be yet another abandoned FOSS project.

[Loli0721]

Same question.
There is no option to skip empty files that report errors.
Is this project no longer maintained?