c-ares / c-ares / #355

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ares_getaddrinfo(): do not use search domains if ARES_FLAG_NOSEARCH is set (#638)

c-ares init options defines a flag ARES_FLAG_NOSEARCH that is supposed to prevent search using configured domain suffixes, however when using ares_getaddrinfo() the flag was ignored and domain suffixes were used anyway.

Configuring zero domains to search also does not work (if ndomains == 0 default domain search list is loaded regardless of the flag ARES_OPT_DOMAINS being set).

This change adds a check for the ARES_FLAG_NOSEARCH in as_is_only() function that is used by ares_getaddrinfo() to decide if to try to query next possible name ( next_dns_lookup() )

Fix By: @petrvh

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