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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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src/main.cc
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@ -215,6 +215,7 @@ void usage(int code = 1)
fprintf(stderr, " $BRO_LOG_SUFFIX | ASCII log file extension (.%s)\n", logging::writer::Ascii::LogExt().c_str());
fprintf(stderr, " $BRO_PROFILER_FILE | Output file for script execution statistics (not set)\n");
fprintf(stderr, " $BRO_DISABLE_BROXYGEN | Disable Zeexygen documentation support (%s)\n", getenv("BRO_DISABLE_BROXYGEN") ? "set" : "not set");
fprintf(stderr, " $ZEEK_DNS_RESOLVER | IPv4/IPv6 address of DNS resolver to use (%s)\n", getenv("ZEEK_DNS_RESOLVER") ? getenv("ZEEK_DNS_RESOLVER") : "not set, will use first IPv4 address from /etc/resolv.conf");
fprintf(stderr, "\n");