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2019-09-05Cleanup: move "create_block" from block processor over to data writerDavid Oberhollenzer
It only has one user and is quite specialized actually. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-04Store number of file blocks in generic inode structDavid Oberhollenzer
This simplifies things a little bit. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-04Split fstree inode serialization, move independend part to libsquashfs.soDavid Oberhollenzer
This commit adds a function to libsquashfs.so for writing generic inodes to a meta writer and another function to libsqfshelper.a that turns a tree node to an inode. That way, the tree serialization code can be expressed in terms of those functions and a bulk of the independend code can be moved over to libsquashfs.so Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-04Add fstree independend directory writer to libsquashfs.soDavid Oberhollenzer
This commit adds a directory writer to libsquashfs that wrapps a meta data writer and provides a higher-level interface for writing directory entries. Under the hood it enforces the rules that squashfs insists upon. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-02Move fstree independend parts of xattr_reader to libsquashfs.soDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-01Internalize the layout of the id_table_t structureDavid Oberhollenzer
As an opaque struct it has a chance to change its layout in the future without breaking ABI compatibiliy. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-01Move command line processing stuff out of compressor codeDavid Oberhollenzer
This commit moves stuff like printing help text, command line option processing and enumerating available processors on stdout out of the generic compressor code. The option string is replaced with a structure that directly exposese the tweakable parameters for all compressors. A function for parsing the command line arguments into this structure is added in sqfshelper. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-01Add C++ gurads to publicly exported functionsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-01API cleanup: Shuffle declarations aroundDavid Oberhollenzer
Move declarations for stuff that is defined in libsquashfs.so into the public headers and declarations for stuff that isn't, out of there. Also move the meta reader/writer helper functions to their respective headers. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-01Break up squashfs.h into topic related headersDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-01Install libsquashfs.so headers on the system in "sqfs" subdirectoryDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-09-01Move some application specific stuff out of libutilDavid Oberhollenzer
This commit does the following: - canonicalize_name is moved to libfstree - source_date_epoch is only used inside libfstree, so it's also moved over and can later be completely internalized - print_version is moved over to sqfshelper. Mainly so it doesn't end up in libsquashfs.so for no sane reason. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-31Turn libsquashfs.a into a shared libraryDavid Oberhollenzer
This of course entails turning the entire project over to libtool magic. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-31Split libsquashfs.a into low seperate librariesDavid Oberhollenzer
The idea is to make libsquashfs.a independend of libfstree.a, so it becomes a general purpose squashfs manipulation library. All the high level glue code for libfstree.a and utilites that are overly specific with to tools are moved to a seperate librarby. This commit makes the first step by moving the stuff with dependencies on libfstree to a seperate library. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-31Merge libcompress.a into libsquashfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-27Bump patch level version numberv0.6.1David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-27Merge alloc_flex conditionals into oneDavid Oberhollenzer
It is shorter and less confusing for coverity. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-26Add a change logDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-26Tune the paranoia down a bitDavid Oberhollenzer
size_t is guaranteed to be large enough to measure the size of things in memory, so when doing exactely that (e.g. strlen(a) + strlen(b)), checking for overflow is pointless since both objects are already in memory. If the addition would overflow, the two strings would occupy more memory than addressable. (Possible exception being some kind of harward style architecture with the two strings being in different kinds of memory of course.) Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-26Move tar_fuzz program over to testsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-25Add minimal test program for fuzzing the fstree_from_file parserDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-25Propperly set errno in read_inode_slink error pathDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-25Size accounting + alloc() overflow checking, round #3David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-24Add minimal test program for fuzzing the tar parserDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Check against format limits in meta_reader_read_dir_headerDavid Oberhollenzer
The SquashFS kernel implementation insists that a directory header is followed by no more than an upper bound of entries, way less than what the filed itself actually supports. This commit makes sure that the meta_reader_read_dir_header function also enforces that same limit. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Size accounting + alloc() overflow checking, round #2David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Do bounds checking in metadata readerDavid Oberhollenzer
In all cases where metadata blocks are read, we can roughly (in some cases even preciesly) say in what range those metadata blocks will be, so it makes sense to throw an error if an attempt is made to wander outside this range. Furthermore, when reading from an uncompressed block, it is more reasonable to check against the actual block bounds than to padd it with 0 bytes. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Some simple search/replace cases for allocationDavid Oberhollenzer
This commit exchanges some malloc(x + y * z) patterns that can be found with a simple git grep and are obvious for the new wrappers. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Add wrappers for calloc style functions with size overflow checkingDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Add primitives for unsigned addition/multiplication with overflowDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-22deserialize_tree: filter out directory loopsDavid Oberhollenzer
The tree deserializer does a recursive depth-first search to populate the directory tree, moving back and forth between the directory listing containing the inode references and the inode table pointing to the list of child inodes. It is completely unaware of hard links and creates duplicate nodes instead. It is possible to create a malicious SquashFS image that contains a directory that contains as child a reference to its own inode. This can also be done transitively (i.e. directory contains its own parent or grand parent), leading to infinite recursion (actually finite, since it terminates once all stack memory is exhausted). This commit adds a simple check to see if a node has the same inode number as any of its would-be parents. If it does, the node is discarded and a warning message is emitted. Other cases with arbitrary layers of indirection could be constructed as well (e.g. dir 'a' contains hard link to 'b' and 'b' one back to 'a'), but the sub hierarchies are always expanded, this check should catch that too. Reported-by: Zachary Dremann <dremann@gmail.com> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-22Fix uint64_t printf for compatility with 32 bit systemsv0.6David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-22Fix resource leak in compare_dir_entries error pathDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Bump version number for next releaseDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Fix "no attributes" sentinel value for xattr readerDavid Oberhollenzer
An inode can be of extended type for reasons other than having extended attributes and simply set the xattr ID to 0xFFFFFFFF to indicate that it doesn't have extended attributes. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Update man pagesDavid Oberhollenzer
- Add "see also" references - Make some adjustments as suggested by man-pages(7) - Clarify environment variable behaviour Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Update sqfsdiff documentationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Fix timestamp comparison for directory sourceDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Also extract files in sqfsdiff that only exist in one of the two sourcesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Fix usage of EXIT_* constants in sqfsdiffDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Use "old" and "new" prefix when extracting files in sqfsdiffDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Make unified dir to sqfs comparison workDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Isolate sqfsdiff global state and split off option processingDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Rename difftool.h to sqfsdiff.hDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Consistently use old/new nomenclature in sqfsdiffDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Cleanup difftool dir entry comparionDavid Oberhollenzer
- Replace a/b nomenclature with old/new - Remove special case handling that isn't needed Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Merge functionality of file on disk and file in sqfs compare functionsDavid Oberhollenzer
Moving towards unified sqfs vs sqfs, sqfs vs dir, dir vs sqfs comparisions. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-20Change CLI of sqfsdiff to specify images through long optionsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-20Remove fscompare programDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-20Add explicit padding to tree_node_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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