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Ticket Resolution Summary Owner Reporter
#18174 duplicate Improper desktop shortcut is created for VM Roman Valov
Description

VirtualBox 6.0 BETA 3

Steps:

Open VirtualBox Right-click any VM Select - Create shortcut on Desktop

Shortcut is created but has improper executable VirtualBox.exe instead of VirtualBoxVM.exe

#18172 invalid CentOS7 with Guest Additions won't increase resolution and the desktop panels keep freezing -> please use forums nsuper
Description

I updated several packages today using the Application Installer, and since the restart, my CentOS7 guest won't fill my whole VirtualBox window (resolution stuck at 1024x768 while it's normally 1920x1070) and the desktop panels have started freezing.

#18171 fixed wrong RCODE from DNS AAAA query with --natdnshostresolver1 (with suggested fix) => Fixed in SVN ncopa
Description

The natdnshostresolver returns NOTIMP (rcode 4) on AAAA queries. This causes 5 seconds delays with musl libc, which similar to Go's stupresolver does both A and AAAA queries on hostname lookups. Problem was reported to Alpine Linux and to the musl libc mailing list, where the response was that this is is a bug in VirtualBox.

Example tcpdump:

22:34:45.724471 IP 10.0.2.15.52190 > 10.0.2.3.53: 27848+ A? www.google.com. (32)
22:34:45.724542 IP 10.0.2.15.52190 > 10.0.2.3.53: 28141+ AAAA? www.google.com. (32)
22:34:45.812045 IP 10.0.2.3.53 > 10.0.2.15.52190: 27848 1/0/0 A 216.58.194.164 (48)
22:34:45.812068 IP 10.0.2.3.53 > 10.0.2.15.52190: 28141 NotImp 0/0/0 (32)
22:34:48.228641 IP 10.0.2.15.52190 > 10.0.2.3.53: 28141+ AAAA? www.google.com. (32)
22:34:48.228965 IP 10.0.2.3.53 > 10.0.2.15.52190: 28141 NotImp 0/0/0 (32)

According RFC 1035:

OPCODE A four bit field that specifies kind of query in this message.

...

RCODE Response code - this 4 bit field is set as part of responses. The values have the following interpretation:

...

4 Not Implemented - The name server does not support the requested kind of query.

The fix is to return RCode_NXDomain instead of RCode_NotImp:

https://www.virtualbox.org/browser/vbox/trunk/src/VBox/Devices/Network/slirp/hostres.c?rev=59202#L408

402	    if (   qtype != Type_A
403	        && qtype != Type_CNAME
404	        && qtype != Type_PTR
405	        && qtype != Type_ANY)
406	    {
407	        LogErr(("NAT: hostres: unsupported qtype %d\n", qtype));
408	        return refuse(pData, m, RCode_NotImp);
409	    }
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