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)
Alpine linux doesn't use glibc but instead musl c, so provides a good alternative test bed. We are also adding the oldest non-EOL ubuntu version so we can test against older linux variants to prevent surprises.
This patch also migrates more tests to use cmake and ninja in order to reduce overall build times as we seem to run out of credits on Cirrus-CI pretty quickly.
Fix By: Brad House (@bradh352)
There is a reported build issue where getrandom() is detected
but compile fails due to a missing prototype. This commit attempts
to resolve that issue.
Fixes Bug: #665
Fix By: Brad House (@bradh352)
This patch added the `SOCK_DNS` flag when running on OpenBSD. Allowing a reduced set of `pledge(2)` promises. Before this patch. The "stdio rpath inet" promises must be used in order to resolve any records. After the patch inet can be replaced with dns which only allows communication on destination port 53, instead of on all ports.
Side note: I checked the OpenBSD kernel source code. Even though the socket document says the DNS port (typically 53)., The OpenBSD 7.4 kernel only allows 53.
Fix By: Martin Chang (@marty1885)
New test cases depend on internal symbols for calculating timeouts.
Disable those test features if symbol hiding is enabled.
Fixes Bug: #664
Fix By: Brad House (@bradh352)
When doing ares_gethostbyname() or ares_getaddrinfo() with AF_UNSPEC, if ares_cancel() was called after one address class was returned but before the other address class, it would return ARES_SUCCESS rather than ARES_ECANCELLED.
Test case has been added for this specific condition.
Fixes Bug: #662
Fix By: Brad House (@bradh352)
GoogleTest should be unbundled. Google changed their guidance a few years back and modern versions of google test cannot build the bundling code file.
This PR also updates to use C++14 as is required by modern GoogleTest versions.
Fixes Bug: #506
Fix By: Brad House (@bradh352)
The parser for the sortlist has been rewritten to use the ares__buf_*() functions. This also resolves some known bugs in accepting invalid sortlist entries which should have caused parse failures.
Fixes Bug: #501
Fix By: Brad House (@bradh352)
As of c-ares 1.22.0, server timeouts were erroneously not incrementing server failures meaning the server in use wouldn't rotate. There was apparently never a test case for this condition.
This PR fixes the bug and adds a test case to ensure it behaves properly.
Fixes Bug: #650
Fix By: Brad House (@bradh352)
Some environments may send router advertisements on a link setting their link-local (fe80::/10) address as a valid DNS server to the remote system. This will cause a DNS entry to be created like `fe80::1%iface`, since all link-local network interfaces are technically part of the same /10 subnet, it must be told what interface to send packets through explicitly if there are multiple physical interfaces.
This PR adds support for the %iface modifier when setting DNS servers via `/etc/resolv.conf` as well as via `ares_set_servers_csv()`.
For MacOS and iOS it is assumed that libresolve will set the `sin6_scope_id` and should be supported, but my test systems don't seem to read the Router Advertisement for RDNSS link-local. Specifying the link-local dns server on MacOS via adig has been tested and confirmed working.
For Windows, this is similar to MacOS in that the system doesn't seem to honor the RDNSS RA, but specifying manually has been tested to work.
At this point, Android support does not exist.
Fixes Bug #462
Supersedes PR #463
Fix By: Brad House (@bradh352) and Serhii Purik (@sergvpurik)
On 32bit systems, a codeblock that would intentionally never
be executed was emitting a warning. Rework the code to
prevent the warning. More code, no behavior difference, but
keeps people from complaining about the warning...
Fixes Bug: #645
Fix By: Brad House (@bradh352)
Brad House
Gregor Jasny
Martin Chang