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v2: * Code refine. * For DnsCache, the minimum value of TTL is selected between CNAME and A/AAAA record. According RFC 1034 - 3.6.2, if the query name is an alias, the name server will include the CNAME record in the response and restart the query at the domain name specified in the data field of the CNAME record. RFC also provides one example server action when A query received: Suppose a name server was processing a query with for USCISIC.ARPA, asking for type A information, and had the following resource records: USC-ISIC.ARPA IN CNAME C.ISI.EDU C.ISI.EDU IN A 10.0.0.52 Both of these RRs would be returned in the response to the type A query. Currently, DnsDxe driver doesn't handle the CNAME type response, which will cause any exception result. The driver need continue the packet parsing while CNAME type record parsed. So, this patch is used to handle it correctly. Cc: Hegde Nagaraj P <nagaraj-p.hegde@hpe.com> Cc: Fu Siyuan <siyuan.fu@intel.com> Cc: Ye Ting <ting.ye@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com> Reviewed-by: Fu Siyuan <siyuan.fu@intel.com> Tested-by: Hegde Nagaraj P <nagaraj-p.hegde@hpe.com>