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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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After trying removing many instances of `struct stat`, there is only
one user of inode_stat left, so move the function there.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Some of the on-disk format internals are moved to a separate header
and some of the stuff from internal.h is moved to that format header.
C++ guards are added in addtion.
Everything PAX related is moved to pax_header.c, some internal
functions are marked as static.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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On GNU/Linux, *BSD or MacOS we can simply use the system default
library. The copy was primarily only there for the Windows build.
The build script for Windows has now been adapted to download and
compile a shared library from a tarball.
This removes a huge chunk of code from the git tree as well as
the release tarballs. Additionally it gets rid of iffy things like
removing the Zlib copyright/version strings, so the libsquashfs DLL
doesn't export it.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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The idea was originally to use struct stat in the libfstree code, so
we can simply hose data read from a directory into the fstree_t. The
struct was then also used with libtar, for simpler interoperation,
but it turned out to introduce a lot of platform quirks and causes
more trouble than it's worth.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If rdsquashfs unpacks a directory tree that contains a symlink,
followed by something else with the exact same name, it will
follow the symlink and can be tricked into writing to an
arbitrary filesystem location controlled by the SquashFS image.
Because there might actually be a reasonable use case, where an
image is unpacked into an directory existing directory tree, with
symlinks that should be followed, this is solved as follows:
- Before unpacking, recursively sort the directory by filename.
- FAIL if (after sorting) two consequtive entries at the same
hierarchy level have the same name.
This solution is more generic and prevents the unpacker from accessing
the same thing twice in generall, thus also excluding the symlink issue.
Hardlinks are already unfolded into duplicate tree nodes by the tree
reader (with loop detection) so that should not prompt further issues.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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The data is processed 2G at a time to avoid this exact issue, but the
check was skipped on 64 bit systems, since the function *used to* use
size_t instead of sqfs_u32.
This commit removes the second check.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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On systems like Windows, the dynamic library and applications can
easily end up being linked against different runtime libraries, so
applications cannot be expected to be able to free() any malloc'd
pointer that the library returns.
This commit adds an sqfs_free function so the application can pass
pointers back to the library to call the correct free() implementation.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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The base path is passed to the fstree_from_file function and in turn
to the individual callbacks.
The line parsing function is modified to allow '*' as mode, uid and gid
for specifically marked callbacks.
A glob callback is added that internally uses the fstree_from_dir scanning
functions in combination with a filter callback.
Directory scanning flags are parsed from the extra arguments before
interpreting it as a path fragment.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This commit mainly serves the static analysis tooling.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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- Instead of using the fstree root, let the caller specify it.
- Add a flag to prevent recursion into sub directories.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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In addition to skipping non-prefixed files and stripping the prefix
off of entries we accept, the targets of links also have to be altered,
since they can be absolute paths with the root prefix attached.
This can affect symbolic links as well. Altough they are allowed to
point into nowhere, across filesystem boundaries, they may also be
absolute paths refering to existing locations in the filesystem, so
no distinction is made by default.
However, the later may be intended (e.g. only a subdirectory is packed
into SquashFS and then mounted at that location), so a command line
switch is added to disable symlink retargetting.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If rdsquashfs describes a filesystem, is configured to use a prefix-path
and a file contains a space, the resulting input path has the prefix
printed as is and the rest of the string in quotation marks.
gensquashfs simply takes the entire rest of the line as is as its
input path and no longer finds the file.
Fix this by omitting the escapes and quotation marks for the
input path.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Modify the man pages and help texts to mention compression support, make
the help option display a list of supported compressors.
Also clarify the squashfs compressor list in the help text to state that
the list shows block compressors supported for SquashFS compression.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If tar2sqfs and sqfs2tar want to use comperssion via libfstream, they
need to link against the compressor libraries.
Also, libfstream may need the apropriate cflags to access the headers
on some platforms.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This commit rewrites the libtar write paths to use libfstream insead of
a FILE pointer. Also, the libcommon file extraction function is remodeled
to use libfstream.
In accordance, rdsquashfs, sqfs2tar and sqfsdiff have some minor
adjustments made to work with the ported libtar and libcommon.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Behave the same way as the POSIX port and do not treat
that as an error.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This commit adds a --stat option to rdsquashfs that dumps a lot of
information about and inode that tunred out to be usefull in
debugging.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If a SquashFS archive contains file names with '..', '/' or similar
nonsense in them, the unpacking code already refuses to process them,
but the 'describe' code path simply triggers an assert that might not
be there if the binary was compiled with NDEBUG defined.
This commit replaces the assert with propper error handling that also
reports on why things are failing and adds an additional check in the
describe_tree function that tests if the file name is sane.
Reported-by: Zachary Dremann <dremann@gmail.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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On a current Fedora 31, when cross compiling with mingw, pkg config
manages to find the Selinux library, but not the header. The configure
script disables WITH_SELINUX, but the library variable is still set,
causing a linker error further down the line.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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- Move the xattr extraction and repacking to xattr.c
- Don't on-the-fly delete the tar xattr list, use the function
from libtar.a
- Split minor tasks into static helper functions
- creating a libtar xattr struct from libsqfs xattr data
- finding a hard link entry from current path and inode number
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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- Split up the huge file in bin/ into one small file per sub directory
- Remove the stub in doc/
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This commit breaks tar2sqfs.c into multiple files:
- options.c contains the command line argument processing
- process_tarball.c contains the main tar repacking code
- tar2sqfs.c contains what is left (the main function)
- A header is added for gluing it all together.
No actual code is changed. The tar repacking code is slightly modified
to pass the sqfs writer and input file pointer around as argument rather
than using a global variable.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This comit breaks sqfs2tar into multiple files:
- options.c contains the command line argument processing
- write_tree.c contains the code for generating the actual tar archive
- sqfs2tar.c contains what is left
- A header is added for glueing it all together.
No actual code is changed.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This commit modifies sqfsdiff to extract the compressor options from
the squashfs image and store them in a compressor configuration if
possible. The failure path is modified to *not* burst into flames on
error, because those options are not required by any compressor to
read data from the disk and pretty much every vendor modifed SquashFS
has messed with those to the point that they cannot be propperly
decoded (or the flag is set and there are no options).
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Its purely informational, but make sure other programs don't print
out scary messages that imply the data has been ineficiently.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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