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io: preserve ipv4/ipv6 flags when resolving InetSocketAddress 

The original InetSocketAddress struct may have has_ipv4 and
has_ipv6 fields set, which will control both the ai_family
used during DNS resolution, and later use of the V6ONLY
flag.

Currently the standalone DNS resolver code drops the
has_ipv4 & has_ipv6 flags after resolving, which means
the later bind() code won't correctly set V6ONLY.

This fixes the following scenarios

  -vnc :0,ipv4=off
  -vnc :0,ipv6=on
  -vnc :::0,ipv4=off
  -vnc :::0,ipv6=on

which all mistakenly accepted IPv4 clients

Acked-by: Gerd Hoffmann <kraxel@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2017-05-17 14:34:36 +01:00
parent 94bc0d1978
commit 563a3987b9
1 changed files with 4 additions and 2 deletions
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6
io/dns-resolver.c
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@ -116,8 +116,10 @@ static int qio_dns_resolver_lookup_sync_inet(QIODNSResolver *resolver,
.numeric = true,
.has_to = iaddr->has_to,
.to = iaddr->to,
.has_ipv4 = false,
.has_ipv6 = false,
.has_ipv4 = iaddr->has_ipv4,
.ipv4 = iaddr->ipv4,
.has_ipv6 = iaddr->has_ipv6,
.ipv6 = iaddr->ipv6,
};
(*addrs)[i] = newaddr;