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2016-11-13Fix warnings building with MSVC on Windows (#165)Hugh Bellamy
2016-06-06buffer: proper safety checks for unbounded memoryVicent Marti
The previous work for unbounded memory usage and overflows on the buffer API had several shortcomings: 1. The total size of the buffer was limited by arbitrarily small precision on the storage type for buffer indexes (typedef'd as `bufsize_t`). This is not a good design pattern in secure applications, particualarly since it requires the addition of helper functions to cast to/from the native `size` types and the custom type for the buffer, and check for overflows. 2. The library was calling `abort` on overflow and memory allocation failures. This is not a good practice for production libraries, since it turns a potential RCE into a trivial, guaranteed DoS to the whole application that is linked against the library. It defeats the whole point of performing overflow or allocation checks when the checks will crash the library and the enclosing program anyway. 3. The default size limits for buffers were essentially unbounded (capped to the precision of the storage type) and could lead to DoS attacks by simple memory exhaustion (particularly critical in 32-bit platforms). This is not a good practice for a library that handles arbitrary user input. Hence, this patchset provides slight (but in my opinion critical) improvements on this area, copying some of the patterns we've used in the past for high throughput, security sensitive Markdown parsers: 1. The storage type for buffer sizes is now platform native (`ssize_t`). Ideally, this would be a `size_t`, but several parts of the code expect buffer indexes to be possibly negative. Either way, switching to a `size` type is an strict improvement, particularly in 64-bit platforms. All the helpers that assured that values cannot escape the `size` range have been removed, since they are superfluous. 2. The overflow checks have been removed. Instead, the maximum size for a buffer has been set to a safe value for production usage (32mb) that can be proven not to overflow in practice. Users that need to parse particularly large Markdown documents can increase this value. A static, compile-time check has been added to ensure that the maximum buffer size cannot overflow on any growth operations. 3. The library no longer aborts on buffer overflow. The CMark library now follows the convention of other Markdown implementations (such as Hoedown and Sundown) and silently handles buffer overflows and allocation failures by dropping data from the buffer. The result is that pathological Markdown documents that try to exploit the library will instead generate truncated (but valid, and safe) outputs. All tests after these small refactorings have been verified to pass. --- NOTE: Regarding 32 bit overflows, generating test cases that crash the library is trivial (any input document larger than 2gb will crash CMark), but most Python implementations have issues with large strings to begin with, so a test case cannot be added to the pathological tests suite, since it's written in Python.
2016-06-06Fix character type detection in commonmark.cNick Wellnhofer
- Implement cmark_isalpha. - Check for ASCII character before implicit cast to char. - Use internal ctype functions in commonmark.c. Fixes test failures on Windows and undefined behavior.
2016-06-01Coerce realurllen to int.John MacFarlane
This is an alternate solution for pull request #132, which introduced a new warning on the comparison: latex.c:191:20: warning: comparison of integers of different signs: 'size_t' (aka 'unsigned long') and 'bufsize_t' (aka 'int') [-Wsign-compare] if (realurllen == link_text->as.literal.len && ~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
2016-06-01- Changed type from int to size_t to fix implicit type conversion warningBenedict Cohen
2016-04-09Reformatted.John MacFarlane
2016-04-09Fixed a number of issues relating to line wrapping.John MacFarlane
- Extend CMARK_OPT_NOBREAKS to all renderers and add `--nobreaks`. - Do not autowrap, regardless of width parameter, if CMARK_OPT_NOBREAKS is set. - Fixed CMARK_OPT_HARDBREAKS for LaTeX and man renderers. - Ensure that no auto-wrapping occurs if CMARK_OPT_NOBREAKS is enabled, or if output is CommonMark and CMARK_OPT_HARDBREAKS is enabled. - Updated man pages.
2016-03-12Don't use variable length arraysNick Wellnhofer
They're not supported by MSVC.
2016-03-12Switch from "inline" to "CMARK_INLINE"Nick Wellnhofer
Newer MSVC versions support enough of C99 to be able to compile cmark in plain C mode. Only the "inline" keyword is still unsupported. We have to use "__inline" instead.
2016-01-18Merge branch 'master' of https://github.com/mbenelli/cmark into mbenelli-masterJohn MacFarlane
2015-12-28Reformat sources.John MacFarlane
2015-12-28Rename NODE_HTML -> NODE_HTML_BLOCK, NODE_INLINE_HTML -> NODE_HTML_INLINE.John MacFarlane
API change. Sorry, but this is the time to break things, before 1.0 is released. This matches the recent changes to CommonMark.dtd.
2015-12-27latex renderer - better handling of internal links.John MacFarlane
Now we render `[foo](#bar)` as `\protect\hyperlink{bar}{foo}`.
2015-12-22Rename hrule -> thematic_break.John MacFarlane
CMARK_NODE_HRULE -> CMARK_NODE_THEMATIC_BREAK. However we've defined the former as the latter to keep backwards compatibility. See jgm/CommonMark 8fa94cb460f5e516b0e57adca33f50a669d51f6c
2015-12-22CMARK_NODE_HEADER -> CMARK_NODE_HEADING.John MacFarlane
Defined CMARK_NODE_HEADER to CMARK_NODE_HEADING to ease the transition.
2015-12-22Rename 'header' -> 'heading'.John MacFarlane
See jgm/CommonMark commit 0cdbcee4e840abd0ac7db93797b2b75ca4104314 Note that we have defined cmark_node_get_header_level = cmark_node_get_heading_level and cmark_node_set_header_level = camrk_node_set_heading_level for backwards compatibility in the API.
2015-12-19Changed API for CUSTOM_BLOCK and CUSTOM_INLINE.John MacFarlane
Instead of using their `as.literal` content, we now give each custom node *two* literal fields, one to be printed on entering the node (before rendering the children, if any), the other on exiting (after rendering children). This gives us the flexibility to have custom nodes with children.
2015-12-19Rename RAW_BLOCK -> CUSTOM_BLOCK, RAW_INLINE -> CUSTOM_INLINE.John MacFarlane
2015-12-19Added RAW_BLOCK and RAW_INLINE node types.John MacFarlane
These are passed through verbatim by all writers, with no escaping. They are never generated by the parser, and do not correspond to CommonMark elements. They are designed to be inserted by filters that postprocess the AST. For example, a filter might convert specially marked code blocks to svg diagrams in HTML and tikz diagrams in LaTeX, passing these through to the renderer as a RAW_BLOCK.
2015-11-02Replaced sprintf with snprintf.Marco Benelli
2015-07-27Use clang-format, llvm style, for formatting.John MacFarlane
* Reformatted all source files. * Added 'format' target to Makefile. * Removed 'astyle' target. * Updated .editorconfig.
2015-07-14astyle reformatting.John MacFarlane
2015-07-12Small cleanups.John MacFarlane
Moved begin_line setting into render.c, so you don't need to worry about it in outc.
2015-07-12Use cmark_render_code_point in renderers.John MacFarlane
2015-07-12latex renderer - simplified using cmark_render_ascii.John MacFarlane
2015-07-12Removed options field from renderer struct.John MacFarlane
Added options argument to render_node function, and rearrange argument order.
2015-07-12Removed enumlevel field of renderer.John MacFarlane
Now we just calculate this in the latex renderer.
2015-07-12latex: Removed need to access render->in_tight_list_item.John MacFarlane
Also removed unneeded function.
2015-07-12cmark_render: ensure final newline.John MacFarlane
This allows us to remove direct manipulation of buffer from the latex and commonmark renderers.
2015-07-11Restructured common renderer code.John MacFarlane
* Added functions for cr, blankline, out to renderer object. * Removed lit (we'll handle this with a macro). * Changed type of out so it takes a regular string instead of a chunk. * Use macros LIT, OUT, BLANKLINE, CR in renderers to simplify code. (Not sure about this, but `renderer->out(renderer, ...)` sure is verbose.)
2015-07-11Rename cmark_render_state -> cmark_renderer.John MacFarlane
2015-07-11Factored out common bits of rendering into separate render module.John MacFarlane
* Added render.c, render.h. * Moved common functions and definitions from latex.c and commonmark.c to render.c, render.h. * Added a wrapper, cmark_render, that creates a renderer given a character-escaper and a node renderer. Closes #63.
2015-07-07Fixed compiler warnings.John MacFarlane
2015-07-06Use sprintf rather than snprintf because we know it won't overflow.John MacFarlane
A rendered int can't be 20 digits.
2015-07-05Another try at getting snprintf part to compile on Windows.John MacFarlane
2015-07-05Fixed typo in Windows fix.John MacFarlane
2015-07-05LaTeX writer: fixed some compile errors on MSVC.John MacFarlane
2015-07-05LaTeX writer: Fixed straight single, double quote.John MacFarlane
Added comments about required packages.
2015-07-05LaTeX renderer: \textbf for strong.John MacFarlane
2015-07-05astyle formatting improvements.John MacFarlane
2015-07-05Added LaTeX renderer.John MacFarlane
* New exported function in API: `cmark_render_latex`. * Added src/latex.hs. * Updated README and man page. * Closes #31.