Add a function to request the number of active queries from an ares
channel. This will return the number of inflight requests to dns
servers. Some functions like `ares_getaddrinfo()` when using `AF_UNSPEC`
may enqueue multiple queries which will be reflected in this count.
In the future, if we implement support for queuing (e.g. for throttling
purposes), and/or implement support for tracking user-requested queries
(e.g. for cancelation), we can provide additional functions for
inspecting those queues.
Fix By: Brad House (@bradh352)
ares__strsplit provides a newly allocated buffer, so suffix list in
line variable isn't referenced anymore. Related ares_free seems to
have gone missing during refactoring made in #594
Fix By: Vojtěch Vobr (@vojtechvobr)
It may be useful to wait for the queue to be empty under certain conditions (mainly test cases), expose a function to efficiently do this and rework test cases to use it.
Fix By: Brad House (@bradh352)
CMake was unconditionally setting output locations globally, but
it should not do that if it is not the top-level project (e.g.
during chain building). Detect this fact and only set the output
location when top level.
Fixes Issue: #708
Fix By: Anthony Alayo (@anthonyalayo)
In 2020, it was agreed this is optimal maximum size and all
major server software was updated to reflect this.
see https://www.dnsflagday.net/2020/#faq
Fix By: Cristian Rodríguez (@crrodriguez)
Regression introduced in 1.26.0, building c-ares with threading disabled results in ares_init{_options}() failing.
Also adds a new CI test case to prevent this regression in the future.
Fixes Bug: #699
Fix By: Brad House (@bradh352)
This PR implements an event thread to process all events on file descriptors registered by c-ares. Prior to this feature, integrators were required to understand the internals of c-ares and how to monitor file descriptors and timeouts and process events.
Implements OS-specific efficient polling such as epoll(), kqueue(), or IOCP, and falls back to poll() or select() if otherwise unsupported. At this point, it depends on basic threading primitives such as pthreads or windows threads.
If enabled via the ARES_OPT_EVENT_THREAD option passed to ares_init_options(), then socket callbacks cannot be used.
Fixes Bug: #611
Fix By: Brad House (@bradh352)
This pull request adds six flags to instruct the parser under various circumstances to skip parsing of the returned RR records so the raw data can be retrieved.
Fixes Bug: #686
Fix By: Erik Lax (@eriklax)
The previous build system allowed overwriting of CFLAGS/CPPFLAGS/CXXFLAGS on the make command line. Switch to using AM_CFLAGS/AM_CPPFLAGS/AM_CXXFLAGS when we set our own flags for building which ensures they are kept even when a user tries to override.
Fixes Bug: #694
Fix By: Brad House (@bradh352)
It appears as though we should never sanity check the RR name vs the question name as some DNS servers may return results for alias records.
Fixes Bug: #683
Fix By: Brad House (@bradh352)
External integrations don't need sys/random.h in order to compile, remove the dependency. Try to fix building on legacy MacOS versions.
Fixes Issue: #682
Fix By: Brad House (@bradh352)
* cmake: avoid warning about non-existing include dir
In the Debian build logs I noticed the following warning:
cc1: warning: /build/c-ares-1.25.0/test/include: No such file or directory [-Wmissing-include-dirs]
This happened because ${CMAKE_INSTALL_INCLUDEDIR} had been added to
caresinternal. I believe it has been copied from the "real" lib
where it's used in the INSTALL_INTERFACE context. But because
caresinternal is never installed we don't need that include here.
* cmake: drop CARES_TOPLEVEL_DIR variable
The CARES_TOPLEVEL_DIR variable is the same as the automatically
created PROJECT_SOURCE_DIR variable. Let's stick to the official
one. Also because it is already used at places where CARES_TOPLEVEL_DIR
is used as well.
Fix By: Gregor Jasny (@gjasny)
Completely rework the autotools build system, issues have cropped up due to the complexity and could cause issues on even semi-modern Linux systems (Ubuntu 20.04 for example).
Changes include:
Remove all curl/xc/cares m4 helper files, they go overboard on detections of functions and datatypes. Go back to more plain autoconf macros as they've come a long way over the years.
Use known systems and heuristics to determine datatypes for functions like send() and recv(), rather than the error prone detection which required thousands of permutations and might still get it wrong.
Remove unneeded configure arguments like --enable-debug or --enable-optimize, its more common for people to simply pass their own CFLAGS on the command line.
Only require CARES_STATICLIB definition on Windows static builds, its not necessary ever for other systems, even when hiding non-public symbols.
Remove some function and definition detections that were never used in c-ares
The test framework is now embedded into the toplevel configure system, there was no need to chain build the test system as it is never built externally to c-ares.
As a side-effect of the changes, a configure run completes in about 25% of the original time.
This has been tested on various Linux distributions (of varying age), FreeBSD, MacOS, Windows (via MSYS2 with Mingw), and Solaris10/11 (by @dfandrich), AIX 7.3 (by @dfandrich). It is not unlikely that this may have broken more esoteric or legacy systems, and we'll likely need to be ready to accept bug reports and patches, but it has removed over 10k lines of build system code. It is very likely any issues that crop up will add far fewer lines of code to fix such systems.
Fixes Bug: #670
Fix By: Brad House (@bradh352)
Old MacOS SDKs (like 10.8) require you include `sys/socket.h` before you include `net/if.h` as reported by MacPorts. Using a new SDK but with setting the macos target version does not have the same issue.
Fixes Issue: #672
Fix By: Brad House (@bradh352)
* get rid of clashes with curl namespace
* remove warnings due to deprecated functionality
* reorder some macro calls to get rid of warnings due to being called in the wrong order
Fix By: Brad House (@bradh352)
We want to limit as much as possible any hand written parsers.
ares__buf_split() uses the new memory-safe parsing routines. This
adds a couple of additional flags to remove duplicates which the
existing split code did.
Fix By: Brad House (@bradh352)
In order to be sure a different server is chosen on the next query,
a read error should result in the failure count being updated
first before requeing the request to a different server.
Fix By: Brad House (@bradh352)
ahost wasn't printing both ipv4 and ipv6 addresses. This day and age, it really should.
This PR also adds the ability to specify the servers to use.
Fix By: Brad House (@bradh352)
If the ability to enumerate interface ip addresses does not exist
on a system, the stub function contained the wrong prototype.
Fixes Bug: #668
Fix By: Brad House (@bradh352)
Brad House
Vojtěch Vobr
Cheng Zhao
Cristian Rodríguez
Andriy Utkin
Erik Lax
Gregor Jasny