Uh oh!
There was an error while loading. Please reload this page.
macos: support multiple system resolvers like C - #18
Conversation
On macOS, libresolv supports multiple resolvers. This allows users, VPN clients, etc. to delegate queries for certain domains to other resolvers, in addition to the "Super Resolver" specified by /etc/resolv.conf. An example of this would be using something like dnsmasq or launchdns to resolve a Special Use Domain (described by RFC 6761) for local development like *.localhost or *.test This is supported transparently via the gethostbyname and getaddrinfo C calls, but when replacing use of those APIs w/ Resolv, these resolutions no longer happen automatically.
The "Search Strategy" section of resolver(5) on MacOS 14 says that each configured resolver has an associated domain name, which is specified implicitly by the filename in To make |
| if /darwin/ =~ RUBY_PLATFORM && Dir.exist?('/etc/resolver') | ||
| Dir.each_child('/etc/resolver') do |filename| | ||
| resolver = DNS::Config.parse_resolv_conf("/etc/resolver/#{filename}") | ||
| resolver[:search] = [filename] unless resolver[:search] |
There was a problem hiding this comment.
IIUC, the config filename implicitly specifies domain option, which is the key for DNS routing and is a different thing than search option or the search suffix.
On macOS,
libresolvsupports multiple resolvers. This allows users, VPN clients, etc. to delegate queries for certain domains to other resolvers, in addition to the "Super Resolver" specified by/etc/resolv.conf. An example of this would be using something likednsmasqorlaunchdnsto resolve a Special Use Domain (described by RFC 6761) for local development like*.localhostor*.testThis is supported transparently via the
gethostbynameandgetaddrinfoC calls, but when replacing use of those APIs w/Resolv, these resolutions no longer happen automatically.If I can find a link to the respective man page on macOS about this functionality, I can post that here for review from anyone who doesn't have access to macOS.