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Tue, 8 Sep 2020 11:41:55 +0000 (UTC) Date: Tue, 8 Sep 2020 12:41:53 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Thomas Huth Subject: Re: [PATCH] tests/socket-helpers: Only fail socket protocol check if it is really necessary Message-ID: <20200908114153.GG899163@redhat.com> References: <20200908105435.218715-1-thuth@redhat.com> <20200908110715.GF899163@redhat.com> <7a78c69d-28f4-e73b-4acc-fc8dd923db3e@redhat.com> MIME-Version: 1.0 In-Reply-To: <7a78c69d-28f4-e73b-4acc-fc8dd923db3e@redhat.com> User-Agent: Mutt/1.14.6 (2020-07-11) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Disposition: inline Received-SPF: pass client-ip=207.211.31.120; envelope-from=berrange@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/08 00:33:58 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: =?utf-8?Q?Marc-Andr=C3=A9?= Lureau , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Sep 08, 2020 at 01:27:46PM +0200, Thomas Huth wrote: > On 08/09/2020 13.07, Daniel P. Berrangé wrote: > > On Tue, Sep 08, 2020 at 12:54:35PM +0200, Thomas Huth wrote: > >> The tests/test-char test is currently always failing on my system since > >> socket_can_bind_connect("::1", PF_INET6) fails with EINVAL and thus > >> socket_check_protocol_support() is returning -1 for an error. But IPv4 > >> is working fine. The logic in socket_check_protocol_support() seems to > >> be wrong here, if either IPv6 or IPv4 is working, we should not return > >> an error here. Thus rework the function to only return errors if both > >> checks failed. > > > > Can you tell me which exact syscall is giving EINVAL in this scenario ? > > getaddrinfo() fails with -2 (EAI_NONAME ?). The logic in > socket_can_bind_connect() then translates this into EINVAL. Ok, lets just translate EAI_NONAME into EADDRNOTAVAIL as we do for the other getaddrinfo errors we want to treat as soft-failures > > [...] > >> - if (socket_can_bind_connect("::1", PF_INET6) < 0) { > >> - if (errno != EADDRNOTAVAIL) { > >> - return -1; > >> - } > >> - } else { > >> - *has_ipv6 = true; > >> + errv6 = socket_can_bind_connect("::1", PF_INET6); > >> + *has_ipv6 = (errv6 == 0); > >> + > >> + if (!*has_ipv4 && !*has_ipv6 && > >> + (errv4 != EADDRNOTAVAIL || errv6 != EADDRNOTAVAIL)) { > >> + return -1; > >> } > > > > The return value of socket_can_bind_connect is either 0 or -1, > > but you're treating it an errno which isn't right. > > Uh, where's my brown paperbag? ... looks like I need more coffee today... > > Thomas > Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|