It does set ECONNREFUSED explicitly. So let's reuse ServerRefusedError
for it too (it was so far only used when we got a REFUSED DNS answer),
which allows tst_QDnsLookup to handle this as an ignorable failure.
For almost everything else, it sets ETIMEDOUT to indicate "no answer",
which isn't useful. So let's inspect the reply to see if it has
something.
Change-Id: I455fe22ef4ad4b2f9b01fffd17c771ffa4a998be
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
(cherry picked from commit f19e9f2521ff7784223ec34fc6794583f4faa2a5)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
Use qt_ACE_do directly from QtCore, to avoid going through Latin1
(US-ASCII) multiple times.
Drive-by reduce the size of the buffers from PACKETSZ (512) to the
maximum name a label can be (255 plus 1 for the null, just in case).
Drive-by replace the last QString::fromWCharArray with QStringView,
saving an unnecessary memory allocation before calling
QtPrivate::convertToLatin1().
Change-Id: I3e3bfef633af4130a03afffd175d8be1feb5d74b
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Testing for "res_ninit" when WrapResolv.cmake has already checked for
far more complex functions was pointless. Instead, just accept the
library that was found by find_package() as good enough and rename the
feature as "libresolv".
Amends 4a46ba1209907796f4a14f6feb35ed4d70155d7d and
68b625901f9eb7c34e3d7aa302e1c0a454d3190b.
Change-Id: Ib5ce7a497e034ebabb2cfffd1762c0afa2fac6e0
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
We were getting InvalidReplyError because it was simply unknown, which
is not very useful. Previously, the Unix code used res_nquery(), which
does not return timeouts as a condition. It returns -1 if a timeout did
happen, but the content in errno could be a left-over from a previous
timeout (see the "Not a typewriter"[1] problem).
With the rewrite to using res_nmkquery() and res_nsend() from the
previous commits, we can rely on errno being set properly by
res_nsend().
$ $objdir/tests/manual/qdnslookup/qdnslookup @0.0.0.1
; <<>> QDnsLookup 6.6.0 <<>> qdnslookup @0.0.0.1
;; status: TimeoutError (Request timed out)
;; QUESTION:
;qt-project.org IN A
;; Query time: 10008 ms
;; SERVER: 0.0.0.1#53
Tested on FreeBSD, Linux, macOS, and Windows.
[1] https://en.wikipedia.org/wiki/Not_a_typewriter
Change-Id: I3e3bfef633af4130a03afffd175e31958247f9b1
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
The current code was inefficient when replies exceeded the initial
buffer size because the res_nsend() function switched to VC to get the
full reply, but that wouldn't fit our buffer before we enlarged it. This
commit tells res_nsend() to only use UDP or only use TCP, avoiding the
two unnecessary transactions in the lookup.
Since we don't get that second TCP reply now that would tell us the size
of the reply, we must allocate the largest possible buffer for a DNS
reply.
Change-Id: I3e3bfef633af4130a03afffd175e73d2e9fa9bf1
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
The current code is inefficient when dealing with replies exceeding the
PACKETSZ default size. This commit adds an EDNS0 footer to the DNS query
informing the DNS server how big our buffer is. We choose a larger
buffer than the old PACKETSZ so more will fit before a Virtual Circuit
(TCP socket) is required.
The choice is based on IPv6 requirements for the minimum MTU. Any
network incapable of transmitting frames with that big a payload must
support fragmenting and reassembly at the Layer 2 level, below IP.
Ethernet MTU is usually 1500, so we leave a bit on the table, but this
avoids having to discover our Path MTU to the DNS server.
This is incomplete: DNS queries above the 1232-byte limit still perform
the same query four times.
Change-Id: I3e3bfef633af4130a03afffd175e72f7fbc9265d
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
The current code is inefficient when dealing with replies exceeding the
PACKETSZ default size and especially those that require the use of a
Virtual Circuit (TCP socket). When the TC (Truncated) bit is set in the
DNS reply header, res_nquery() automatically switches to VC so it is
able to return the full size of the reply to us. This means we make the
same request four times:
1) over UDP, getting ~512 bytes of data
2) over TCP, getting the full reply but returning ~512 to us
3) over UDP again, getting (maybe) 1400 bytes of data
4) over TCP again, getting all the data
This commit splits res_nquery() into its two component functions,
res_nmkquery() and res_nsend(). This is incomplete: the four queries
above still happen.
Change-Id: I3e3bfef633af4130a03afffd175e728d96d6a604
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Any resolution error that is caused by an invalid request, invalid reply
(only happens on Unix), or a system error can be printed as a warning,
using category "qt.network.dnslookup". Those warnings are disabled by
default.
Change-Id: I5f7f427ded124479baa6fffd175fc40b3e21c969
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
I couldn't make my Windows 10 or 11 query a non-standard port. It kept
complaining about "The parameter is incorrect.", so as a result the unit
test doesn't actually test the new feature there. I can't find a single
example of this on the Internet; my speculation is that the backend API
that DnsQueryEx uses does not support setting port numbers
(DnsQuery_{A,W} didn't offer that option).
[ChangeLog][QtNetwork][QDnsLookup] Added setNameserverPort().
Change-Id: I3e3bfef633af4130a03afffd175d60a581cc0a9c
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
This also updates a few messages and transfers the translation context
from QDnsLookupRunnable to QDnsLookup.
Change-Id: I3e3bfef633af4130a03afffd175e86715e4a25e3
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Simplifies arguments and will allow me to add stateful helper methods.
Change-Id: I3e3bfef633af4130a03afffd175d6044829a96f2
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
This is neater with a simple offset and avoids the potential UB code this
was carrying in:
p += size;
(p < response + responseLength)
It's UB to add to a pointer a size that moves it past the end of its
array. In practice we don't expect this to happen because of
construction (p is always pointing to a heap or auxiliary-thread stack
buffer), but in theory it could happen that said buffer is too close to
the end of the virtual address space and adding `size` causes it to
overflow back to small values.
Change-Id: I5f7f427ded124479baa6fffd175f59939c15c666
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
There's nothing saying the server can't supply those to us, so let's
explicitly skip them. The Windows version already does this because the
windns.h API only supports records of class IN.
Test for this after setNameserverPort() is added.
Pick-to: 6.5
Change-Id: I3e3bfef633af4130a03afffd175e6ddc756c91c5
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
This API is found on FreeBSD, Darwin, Solaris, AIX, and Android Bionic.
That means we complement IPv6 support for most platforms.
Test on macOS:
$ $objdir/tests/manual/qdnslookup/qdnslookup @fe80::1e1b:dff:fee2:49e6%en0
; <<>> QDnsLookup 6.6.0
;; status: NoError
;; QUESTION:
;qt-project.org IN A
;; ANSWER:
qt-project.org 3336 IN A 52.18.144.254
;; Query time: 2 ms
;; SERVER: fe80::1e1b:dff:fee2:49e6%en0#53
Dnsmasq log on the server confirms it was queried.
Change-Id: I3e3bfef633af4130a03afffd175d59c67faa463f
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Instead of using #if, this now uses SFINAE to detect the presence of the
glibc extensions to set IPv6 nameserver addresses. It's also possible
that this fixes some bugs that have always been there, but never checked
because we don't have a way to unit-test explicit name servers.
To that effect, this commit adds a manual unit test that mimics the BIND
tool "dig". When running:
./qdnslookup qt-project.org any @dns.google
it printed for me:
; <<>> QDnsLookup 6.6.0
;; status: NoError
;; QUESTION:
;qt-project.org IN ANY
;; ANSWER:
qt-project.org 3600 IN MX 10 mx.qt-project.org
qt-project.org 3600 IN NS ns14.cloudns.net
qt-project.org 3600 IN NS ns11.cloudns.net
qt-project.org 3600 IN NS ns12.cloudns.net
qt-project.org 3600 IN NS ns13.cloudns.net
qt-project.org 3600 IN A 52.18.144.254
qt-project.org 3600 IN TXT "v=spf1 mx ip4:193.209.87.4 include:spf.protection.outlook.com ~all"
;; Query time: 241 ms
;; SERVER: 2001:4860:4860::8844#53
strace confirms the DNS queries were sent to the correct address.
Change-Id: I3e3bfef633af4130a03afffd175d56a92371ed16
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
The DNS Records are variable length and encode their size in 16 bits
before the Record Data (RDATA). Ensure that both the RDATA and the
Record header fields before it fall inside the buffer we have.
Additionally reject any replies containing more than one query records.
[ChangeLog][QtNetwork][QDnsLookup] Fixed a bug that could cause a buffer
overflow in Unix systems while parsing corrupt, malicious, or truncated
replies.
Pick-to: 5.15 6.2 6.5 6.5.1
Change-Id: I3e3bfef633af4130a03afffd175e4b9547654b95
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Jani Heikkinen <jani.heikkinen@qt.io>
There's little need for us to dynamically load it. The reasons why that
was necessary aren't in the public history (Qt 4.5 already had it[1]). I
remember writing the code in 2007-2008, I just don't remember why.
On modern Linux and FreeBSD, there's no libresolv.so any more and those
symbols have been rolled up into libc.so. It's still necessary on Darwin
systems, so this commit introduces WrapResolv.
It also resolves the unity build issues relating to libresolv symbols.
[1] https://code.qt.io/cgit/qt/qt.git/tree/src/network/kernel/qhostinfo_unix.cpp?h=v4.5.1
Task-number: QTBUG-109394
Change-Id: Ic5799e4d000b6c9395109e008780643bac52122b
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Replace the current license disclaimer in files by
a SPDX-License-Identifier.
Files that have to be modified by hand are modified.
License files are organized under LICENSES directory.
Task-number: QTBUG-67283
Change-Id: Id880c92784c40f3bbde861c0d93f58151c18b9f1
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
This is required to remove the ; from the macro with Qt 6.
Task-number: QTBUG-82978
Change-Id: I3f0b6717956ca8fa486bed9817b89dfa19f5e0e1
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Move away from using 0 as pointer literal.
Done using clang-tidy. This is not complete as
run-clang-tidy can't handle all of qtbase in one go.
Change-Id: I1076a21f32aac0dab078af6f175f7508145eece0
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
The current code only tries to load the required functions from
LIBRESOLV_SO (if defined) and resolv, but on FreeBSD they are in libc:
https://www.freebsd.org/cgi/man.cgi?query=res_query&sektion=3&apropos=0&manpath=freebsd
This commit changes the code so that, after failing to load the
non-existent libraries, it attempts to load the functions with dlsym()
using the special handle RTLD_DEFAULT, which searches for the specified
symbol in the loaded libraries.
Task-number: QTBUG-74844
Change-Id: If97aaae233cabbfa01c30d26d9a7fb01ec3ff5c2
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
When the response from res_nquery is too big for the buffer used to receive it
(of size PACKETSZ, a mere 512 bytes), the returned responseLength is the
size of the data that would have been delivered, had there been enough space.
Trying to process all of the data, including what wasn't delivered, leads to
reading past the end of the buffer, which either causes a crash or leads to
rubbish (from the stack) in the resulting QDnsRecords. Easy to reproduce
using many long TXT records.
Replace the array with a QVarLengthArray; when the response is big, resize()
and retry, so as to actually get all of the data, so that we can process
it all. A follow-up patch will fix the case when even the second call/resize
buffer is not enough and we have to use TCP.
Task-number: QTBUG-64742
Change-Id: I173beb531e11a3828fd9c97f437afc192766035e
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
For the windows file system engine, we add an extra macro to use
library loading if configured to do so, but avoid it on WinRT, as
none of the symbols would be found.
We also QT_REQUIRE_CONFIG(library) in the library headers and
exclude the sources from the build if library loading is disabled.
This, in turn, makes it necessary to clean up some header inclusions.
Change-Id: I2b152cb5b47a2658996b6f4702b038536a5704ec
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Fix compiling under OpenBSD by using Q_OS_OPENBSD define for missing
include file and adding required typedef. Obtained from OpenBSD ports
patches for qt-5.5.1 at
http://cvsweb.openbsd.org/cgi-bin/cvsweb/ports/x11/qt5/patches/
Change-Id: Ide223bffb6b116e8341d0eb39329af4d7a0be6a0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Q_GLOBAL_STATIC does the thread-safe protection for us. And who said we
could only use non-POD types? We can just use a boolean!
Change-Id: Ifea6e497f11a461db432ffff1449b0a88d75d194
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
From Qt 5.7 -> LGPL v2.1 isn't an option anymore, see
http://blog.qt.io/blog/2016/01/13/new-agreement-with-the-kde-free-qt-foundation/
Updated license headers to use new LGPL header instead of LGPL21 one
(in those files which will be under LGPL v3)
Change-Id: I046ec3e47b1876cd7b4b0353a576b352e3a946d9
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
Add a const char * message with QDnsLookupRunnable's translation
context and use that for untranslated warnings and errorString.
Change-Id: I1b6c9fb259fb9ff824a0c3829b2c00c36aaecdfa
Reviewed-by: Richard J. Moore <rich@kde.org>
This information is already registered by the QMessageLogger ctor.
Where, by dropping the << Q_FUNC_INFO in ostream-style qDebug(), only
a string literal remained, converted to printf-style qDebug() on the
go.
Change-Id: I3f261c98fd7bcfa1fead381a75a82713bb75e6f3
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Qt copyrights are now in The Qt Company, so we could update the source
code headers accordingly. In the same go we should also fix the links to
point to qt.io.
Outdated header.LGPL removed (use header.LGPL21 instead)
Old header.LGPL3 renamed to header.LGPL3-COMM to match actual licensing
combination. New header.LGPL-COMM taken in the use file which were
using old header.LGPL3 (src/plugins/platforms/android/extract.cpp)
Added new header.LGPL3 containing Commercial + LGPLv3 + GPLv2 license
combination
Change-Id: I6f49b819a8a20cc4f88b794a8f6726d975e8ffbe
Reviewed-by: Matti Paaso <matti.paaso@theqtcompany.com>
uClibc doesn't have a nsmap member in __res_state. Since it also doesn't have
res_nquery() which is mandatory for QDnsLookup, we can simply disable the code
to fix the build.
Change-Id: Ia872f535519aca3a2de763548c6dd0e3e0ee20d4
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Reviewed-by: Mandeep Sandhu <mandeepsandhu.chd@gmail.com>
The static method QDnsLookupRunnable::query() got an additional parameter for QTBUG-30166, but the #ifdef'd part was not updated.
Change-Id: Ifc317bfae6e02c00936e1922ec77f89fb5faf497
Reviewed-by: Richard J. Moore <rich@kde.org>
Implemented the use of the new QDnsLookup property "nameserver".
On the Linux platform, we can specify both IPv4 and IPv6 addresses
for the nameserver.
On Windows since we are using DnsQuery_W(), which does not have a
way of accepting IPv6 addresses, passing IPv6 nameserver address
is not supported.
On OSX/BSD platforms, specifying IPv6 addresses for nameserver
require access to the __res_state_ext structure which is in a
private header of libresolv (this header is different for BSDs and
OSX). If this feature has to be enabled in the future, we have to
figure out a way to access this struct by either accessing the
private header or by specifying one of our own. Currently, I'm
disabling it till such a solution is arrived at.
Nameserver support on different platforms:
Platform | IPv4 | IPv6
-------------+---------------+---------------
Linux/X11 | supported | supported
-------------+---------------+---------------
Windows | supported | not supported
-------------+---------------+---------------
OSX | supported | not supported
-------------+---------------+---------------
WinRT | not supported | not supported
-------------+---------------+---------------
Others | supported | not supported
| (not tested) |
-------------+---------------+---------------
Task-number: QTBUG-30166
Change-Id: Iedbddf15b9a62738ce4c2cfa0fce051514d64766
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
glibc is nice to us and provides a #define with the actual name. On most
Linux systems, the .so file is installed only if the glibc-devel package
is installed. For all of us Qt developers, it's installed. But for end
users, it might not be.
Change-Id: Id455371db91a074befd3bcd071f285c725d7e7e5
Reviewed-by: Ian Monroe <imonroe@kde.org>
Reviewed-by: Richard J. Moore <rich@kde.org>
Change copyrights and license headers from Nokia to Digia
Change-Id: If1cc974286d29fd01ec6c19dd4719a67f4c3f00e
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Since there is non-atomic data that is protected by 'triedResolve',
the (outer) read from triedResolve needs to have acquire, and the
store needs to have release semantics. The release implied by the
mutex unlock is not good enough because it only synchronises-with
the locking of the same mutex, which not all threads execute.
Change-Id: If46b3ea6ccfdd66ca41ce44d4f45bef2c2c30f72
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Shane Kearns <shane.kearns@accenture.com>
Unify the includes for resolver function on unix-like platforms
to avoid build failures on BSD platforms.
Change-Id: I9accd7077d5a319a2c93642e011492d0fc779394
Reviewed-by: Holger Freyther <holger+qt@freyther.de>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The QDnsLookup class provides asynchronous APIs for performing
DNS lookups. For now, the following lookups are supported:
- A and AAAA
- CNAME as defined per RFC 1035
- MX as defined per RFC 1035
- NS as defined per RFC 1035
- PTR as defined per RFC 1035
- SRV as defined per RFC 2782
- TXT as defined per RFC 1035
Task-number: QTBUG-10481
Change-Id: I46c1741ec23615863eeca3a1231d5e3f8942495e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
