6cd086050f
Motivation: The DNS resolver supports search domains. However the ndots are not correctly enforced. The search domain should only be appended under the following scenario [1]: > Resolver queries having fewer than ndots dots (default is 1) in them will be attempted using each component of the search path in turn until a match is found. The DNS resolver current appends the search domains if ndots is 0 which should never happen (because no domain can have less than 0 dots). [1] https://linux.die.net/man/5/resolv.conf Modifications: - Parse /etc/resolv.conf to get the default value for ndots on Unix platforms - The search domain shouldn't be used if ndots is 0 - Avoid failing a promise to trigger the search domain queries in DnsNameResolverContext#resolve Result: More correct usage of search domains in the DNS resolver. Fixes https://github.com/netty/netty/issues/6844. |
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