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Remove 'dns_resolver' option, replace w/ ZEEK_DNS_RESOLVER env. var.

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The later simply doesn't work well in conjunction with hostname
literals.  i.e. "google.com" (without quotes) needs to be resolved
to a set of addresses at parse-time, so if a user wishes to use a
custom resolver, we need that to be configured independently from
the order in which scripts get parsed.  Configuring 'dns_resolver'
via scripting "redef" is clearly dependent on parse order.

Note 'dns_resolver' hasn't been in any release version yet, so
I'm removing it outright, no deprecation.  The ZEEK_DNS_RESOLVER
environment variable now serves the original purpose.
This commit is contained in:
Jon Siwek 2019-04-29 18:09:29 -07:00
parent 49908ac865
commit f7c1cde7c7
5 changed files with 29 additions and 36 deletions
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6
scripts/base/init-bare.zeek
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@ -3743,12 +3743,6 @@ global dns_skip_all_addl = T &redef;
## traffic and do not process it. Set to 0 to turn off this functionality.
global dns_max_queries = 25 &redef;
## The address of the DNS resolver to use. If not changed from the
## unspecified address, ``[::]``, the first nameserver from /etc/resolv.conf
## gets used (IPv6 is currently only supported if set via this option, not
## when parsed from the file).
const dns_resolver = [::] &redef;
## HTTP session statistics.
##
## .. zeek:see:: http_stats