dirmngr: Add option --standard-resolver.
* dirmngr/dirmngr.c (oStandardResolver): New constant. (opts): New option --standard-resolver. (parse_rereadable_options): Set option. * dirmngr/dns-stuff.c: Refactor all code to support the new option. (standard_resolver): New var. (enable_standard_resolver, standard_resolver_p): New func. * dirmngr/http.c (connect_server): Remove USE_DNS_SRV build conditional. * dirmngr/ks-engine-hkp.c (map_host): Ditto. * dirmngr/server.c (cmd_getinfo) <dnsinfo>: Take care of new option * configure.ac (HAVE_ADNS_IF_TORMODE): Remove var ADNSLIB. ac_define USE_ADNS in the adns checking code. Remove options --disable-dns-srv and --disable-dns-cert. Always look for the system resolver. Print warning if no system resolver was found. (USE_DNS_CERT, USE_DNS_SRV): Remove ac_defines. (HAVE_SYSTEM_RESOLVER): New ac_define. (USE_DNS_SRV): Remove am_conditional; not used anyway.
This option allows for runtime switching to the system's standard
resolver. This is mainly useful to work around possible bugs in the
optional resolver libraries (as of now ADNS). Note that on Windows
there is no code to use systems's resolver and thus for full
functionality dirmngr must be build with a separate resolver.
This patch also does way with configure options to disable the use of
CERT and SRV records.
- Signed-off-by: Werner Koch <wk@gnupg.org>