Make ahost a dependency of adig to prevent issues with them both
referencing ares_strcasecmp.c and ares_getopt.c. This appears to be
a bug in the Cmake generator for MSVC project files.
Fixes#796
Fix By: Brad House (@bradh352)
`ares__hosts_entry_to_hostent()` would allocate a separate buffer for
each address, but `ares_free_hostent()` expects a single allocation to
hold all addresses.
This PR fixes this issue and simplifies the logic by using the
already-existing `ares__addrinfo2hostent()` to write the hostent instead
of coming up with yet another way to write the structure.
Fixes#823
Fix By: Brad House (@bradh352)
UDP is connectionless, but systems use ICMP unreachable messages to
indicate there is no ability to reach the host or port, which can result
in a `send()` returning an error like `ECONNREFUSED`. We need to handle
non-retryable codes like that to treat it as a connection failure so we
requeue any queries on that connection to another connection/server
immediately. Otherwise what happens is we just wait on the timeout to
expire which can greatly increase the time required to get a definitive
message.
This also adds a test case to verify the behavior.
Fixes#819
Fix By: Brad Houes (@bradh352)
c-ares utilizes recursion for some operations, and some of these
processes can have unintended side effects, such as if a callback
is called that then recurses into the same function. This can cause
strange cleanup conditions that lead to crashes.
Try to disassociate queries with connections as early as possible and
move cleaning up unneeded connections to its own scan rather than
trying to detect each time a query is disassociated from a connection.
Fix By: Brad House (@bradh352)
We've had reports of user-after-free type crashes in Windows cleanup
code for the Event Thread. In evaluating the code, it appeared there
were some memory leaks on per-connection handles that may have remained
open during shutdown, while trying to resolve that it became apparent
the methodology chosen may not have been the right one for interfacing
with the Windows AFD system as stability issues were seen during this
debugging process.
Since this system is completely undocumented, there was no clear
resolution path other than to switch to the *other* methodology which
involves directly opening `\Device\Afd`, rather than spawning a "peer
socket" to use to queue AFD operations.
The original methodology chosen more closely resembled what is employed
by [libuv](https://github.com/libuv/libuv) and given its widespread use
was the reason it was used. The new methodology more closely resembles
[wepoll](https://github.com/piscisaureus/wepoll).
Its not clear if there are any scalability or performance advantages or
disadvantages for either method. They both seem like different ways to
do the same thing, but this current way does seem more stable.
Fixes#798
Fix By: Brad House (@bradh352)
AppVeyor has gotten progressively slower over the last year or so. Move
some Windows builds to GitHub actions which is considerably faster.
Fix By: Brad House (@bradh352)
On some broken MacOS SDK versions, if HAVE_UNISTD_H is defined, it
must be defined to 1, otherwise it will cause build errors. Autotools
always defines to 1, but CMake doesn't.
Fixes Issue: #787
Fix By: Brad House (@bradh352)
The query cache wasn't properly flushing on server list changes
and was attempting to flush even when the server list didn't
actually change.
Fix By: Brad House (@bradh352)
Due to a logic flaw dns name compression writing was not properly implemented
which would result in the name prefix not being written for a partial match.
Fixes Bug: #757
Fix By: Brad House (@bradh352)
The DNS message protocol when using non-binary strings needs to be in
the ASCII printable range. The function prototype does elude to this
but it was not actually validating the string was in anyway valid and
could be used. DNS parsing will now fail if an expected string isn't
an ASCII string.
Fixes Issue: #769
Fix By: Brad House (@bradh352)
salen validation should be greater than or equal to the required
storage size. Its not uncommon to use `struct sockaddr_storage` in
modern code which is definitely larger than `struct sockaddr_in` and
on some systems even larger than `struct sockaddr_in6`.
Fixes Issue: #752
Fix By: Brad House (@bradh352)
If an invalid event thread system was provided, it would crash during cleanup due to a NULL pointer dereference.
Fixes Issue: #749
Fix By: Brad House (@bradh352)
If initializing using default settings fails, there may be a memory leak of
search domains that were set by system configuration.
Fixes Issue: #724
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)
In some circumstances a file descriptor can be closed, then a new
file descriptor pointing to a different endpoint can be opened. These
events must not be merged, a delete must always be processed since
they are not actually pointing to the same connection even though
the file descriptor itself is the same, the OS just re-used 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)
Brad House
Gregor Jasny
Volker Schlecht
Faraz
Vojtěch Vobr
Cheng Zhao
Cristian Rodríguez