Use ADNS, so that IPv4 reverse DNS lookups are non-blocking. Since

ADNS does not yet support IPv6, reverse lookups of IPv6 addresses are
still blocking.  (Bug 627).

ChangeLog

+2003-08-06  Per Cederqvist  <ceder@ceder.dyndns.org>
+
+	Use ADNS, so that IPv4 reverse DNS lookups are non-blocking.
+	Since ADNS does not yet support IPv6, reverse lookups of IPv6
+	addresses are still blocking.  (Bug 627).
+	* src/server/prot-a.c (prot_a_parse_packet): Skip whitespace when
+	blocking the client waiting for a DNS reply.
+	* src/server/connections.c (parse_unparsed): Return immediately if
+	the session became blocked by DNS.
+	(dns_resolution): Schedule an idle check, as a client may have
+	become unblocked.  Don't call isc_enable() here.  Instead, add the
+	session to the run-queue.  There may be pending input in the input
+	buffer.  Handle ADNS errors.
+	(login_request): Check the return value of isc_resolve_remote().
+	(read_from_connection): Return if the session is blocked by DNS.
+	* src/server/testsuite/lyskomd.0/regexp-match-cov.exp: After the
+	adns integration, we need to ignore 25 unreachable blocks.
+	* src/server/testsuite/lyskomd.0/aux-items-cov.exp: After the
+	adns integration, we need to ignore 25 unreachable blocks.
+	* src/server/testsuite/config/unix.exp (check_valgrind): After the
+	adns integration, we need to ignore 25 unreachable blocks.
+
+	Added the ability to do reverse queries to the oop adns adapter.
+	* src/libraries/liboop/oop-adns.h, src/libraries/liboop/adns.c
+	(oop_adns_submit): New argument: errcode.
+	(oop_adns_submit_reverse): New function.
+
 2003-08-05  Per Cederqvist  <ceder@ceder.dyndns.org>
 
 	Update testsuite: clients that hasn't completed the handshake