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Adding multiple questions on a single DNS query is not supportted by most DNS servers. This patch issues two separate DNS queries sequentially for ipv4 and then for ipv6. Fixes: https://savannah.gnu.org/bugs/?39710 * grub-core/net/bootp.c (parse_dhcp_vendor): Add DNS option. * grub-core/net/dns.c (grub_dns_qtype_id): New enum. * (grub_net_dns_lookup): Now using separated dns packages. * (grub_cmd_nslookup): Add error condition. * (grub_cmd_list_dns): Print DNS option. * (grub_cmd_add_dns): Add four parameters: --only-ipv4, * --only-ipv6, --prefer-ipv4, and --prefer-ipv6. * include/grub/net.h (grub_dns_option_t): New enum. * (grub_net_network_level_address): option added. Also-by: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com> Signed-off-by: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. Please look at the GRUB Wiki <http://grub.enbug.org> for testing procedures. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'