Comments (8)
mpartel
commented on September 17, 2024
1
Works on Linux, so appears to be a limitation of MacOS or fuse-t.
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slonopotamus
commented on September 17, 2024
Works on Linux
Confirming, btw. Next time I'll first test on Linux before creating an issue :D Sorry for the noise.
Reported to:
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mpartel
commented on September 17, 2024
Actually I may have been hasty :)
Some things need MacOS-specific functions. But I just checked and didn't find any obvious API related to domain sockets.
You (sorry, I've no access to a mac at the moment) could check with bindfs -d -f ... what, if any, call nc ends up making into bindfs. If no call is made then it's pretty clearly a fuse problem. Otherwise, perhaps we need an additional special case in mknod or something.
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slonopotamus
commented on September 17, 2024
Output of bindfs -d -f ... produced during nc -U <path> -l:
With macFUSE:
unique: 2, opcode: GETATTR (3), nodeid: 1, insize: 56, pid: 405
getattr /
unique: 2, success, outsize: 136
unique: 3, opcode: GETXATTR (22), nodeid: 1, insize: 77, pid: 405
getxattr / com.apple.FinderInfo 32 0
unique: 3, success, outsize: 48
unique: 2, opcode: GETATTR (3), nodeid: 1, insize: 56, pid: 111
getattr /
unique: 2, success, outsize: 136
unique: 3, opcode: LOOKUP (1), nodeid: 1, insize: 45, pid: 698
LOOKUP /sock
getattr /sock
unique: 3, error: -2 (No such file or directory), outsize: 16
unique: 2, opcode: MKNOD (8), nodeid: 1, insize: 61, pid: 698
mknod /sock 0140755 0x0 umask=0000
unique: 2, error: -22 (Invalid argument), outsize: 16
With fuse-t:
unique: 39, opcode: STATFS (17), nodeid: 1, insize: 40, pid: 0
statfs_x /
unique: 39, success, outsize: 96
unique: 40, opcode: GETATTR (3), nodeid: 1, insize: 56, pid: 0
getattr /
unique: 40, success, outsize: 136
unique: 41, opcode: LOOKUP (1), nodeid: 1, insize: 45, pid: 0
LOOKUP /sock
getattr /sock
unique: 41, error: -2 (No such file or directory), outsize: 16
So, it looks like we have different bugs here?
- macFUSE passes
mknodcall to bindfs, but bindfs fails to handle it - fuse-t doesn't pass
mknodto bindfs at all
For the reference, here's how nc -U sock -l through bindfs looks on Linux:
unique: 64, opcode: GETATTR (3), nodeid: 1, insize: 56, pid: 16753
getattr[NULL] /
unique: 64, success, outsize: 120
unique: 66, opcode: LOOKUP (1), nodeid: 1, insize: 45, pid: 16753
LOOKUP /sock
getattr[NULL] /sock
unique: 66, error: -2 (No such file or directory), outsize: 16
unique: 68, opcode: GETATTR (3), nodeid: 1, insize: 56, pid: 16753
getattr[NULL] /
unique: 68, success, outsize: 120
unique: 70, opcode: LOOKUP (1), nodeid: 1, insize: 45, pid: 16753
LOOKUP /sock
getattr[NULL] /sock
unique: 70, error: -2 (No such file or directory), outsize: 16
unique: 72, opcode: GETATTR (3), nodeid: 1, insize: 56, pid: 16753
getattr[NULL] /
unique: 72, success, outsize: 120
unique: 74, opcode: MKNOD (8), nodeid: 1, insize: 61, pid: 16753
mknod /sock 0140755 0x0 umask=0022
getattr[NULL] /sock
NODEID: 3
unique: 74, success, outsize: 144
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slonopotamus
commented on September 17, 2024
In macos-fuse-t/fuse-t#31, I was given this link: https://libfuse.github.io/doxygen/example_2passthrough__helpers_8h_source.html. mknod in bindfs doesn't currently have any special handling for S_ISSOCK. Maybe it should?
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slonopotamus
commented on September 17, 2024
@mpartel what do you think?
My current understanding is that
- There's missing functionality in fuse-t: it doesn't call
mknodat all - There's missing support for
S_ISSOCKin bindfsmknodimplementation - macFUSE works properly
I suggest reopening this issue and will try to fix №2 (and send a PR).
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mpartel
commented on September 17, 2024
Yes, that seems likely. Thanks! And apologies, this week it's especially difficult for me to anything mac-related.
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slonopotamus
commented on September 17, 2024
See #133. With those fixes, I'm able to talk with nc over AF_UNIX socket created inside bindfs-mounted dir.
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