1ec8f24b7SThomas Gleixner# SPDX-License-Identifier: GPL-2.0-only 21a4240f4SWang Lei# 31a4240f4SWang Lei# Configuration for DNS Resolver 41a4240f4SWang Lei# 51a4240f4SWang Leiconfig DNS_RESOLVER 61a4240f4SWang Lei tristate "DNS Resolver support" 7*864e898bSMasahiro Yamada depends on KEYS 81a4240f4SWang Lei help 91a4240f4SWang Lei Saying Y here will include support for the DNS Resolver key type 101a4240f4SWang Lei which can be used to make upcalls to perform DNS lookups in 111a4240f4SWang Lei userspace. 121a4240f4SWang Lei 131a4240f4SWang Lei DNS Resolver is used to query DNS server for information. Examples 141a4240f4SWang Lei being resolving a UNC hostname element to an IP address for CIFS or 151a4240f4SWang Lei performing a DNS query for AFSDB records so that AFS can locate a 161a4240f4SWang Lei cell's volume location database servers. 171a4240f4SWang Lei 181a4240f4SWang Lei DNS Resolver is used by the CIFS and AFS modules, and would support 195227bbb0SSteve French SMB2 later. DNS Resolver is supported by the userspace upcall 201a4240f4SWang Lei helper "/sbin/dns.resolver" via /etc/request-key.conf. 211a4240f4SWang Lei 229dfe1361SMauro Carvalho Chehab See <file:Documentation/networking/dns_resolver.rst> for further 231a4240f4SWang Lei information. 241a4240f4SWang Lei 251a4240f4SWang Lei To compile this as a module, choose M here: the module will be called 261a4240f4SWang Lei dnsresolver. 271a4240f4SWang Lei 281a4240f4SWang Lei If unsure, say N. 29