# SPDX-License-Identifier: GPL-2.0-only
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#
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# Configuration for DNS Resolver
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#
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config DNS_RESOLVER
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tristate "DNS Resolver support"
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depends on NET && KEYS
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help
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Saying Y here will include support for the DNS Resolver key type
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which can be used to make upcalls to perform DNS lookups in
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userspace.
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DNS Resolver is used to query DNS server for information. Examples
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being resolving a UNC hostname element to an IP address for CIFS or
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performing a DNS query for AFSDB records so that AFS can locate a
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cell's volume location database servers.
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DNS Resolver is used by the CIFS and AFS modules, and would support
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SMB2 later. DNS Resolver is supported by the userspace upcall
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helper "/sbin/dns.resolver" via /etc/request-key.conf.
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See <file:Documentation/networking/dns_resolver.rst> for further
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information.
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To compile this as a module, choose M here: the module will be called
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dnsresolver.
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If unsure, say N.
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