Added +unexpected option so dig will print replies from unexpected

sources.

bin/dig/dig.c

@@ -235,6 +235,8 @@ help(void) {
 "                 +tries=###          (Set number of UDP attempts) [3]\n"
 "                 +[no]ttlid          (Control display of ttls in records)\n"
 "                 +[no]ttlunits       (Display TTLs in human-readable units)\n"
+"                 +[no]unexpected     (Print replies from unexpected sources\n"
+"                                      default=off)\n"
 "                 +[no]unknownformat  (Print RDATA in RFC 3597 \"unknown\" "
 					"format)\n"
 "                 +[no]vc             (TCP mode (+[no]tcp))\n"
@@ -1667,8 +1669,25 @@ plus_option(char *option, bool is_batchfile,
 		}
 		break;
 	case 'u':
+		switch (cmd[1]) {
+		case 'n':
+			switch (cmd[2]) {
+			case 'e':
+				FULLCHECK("unexpected");
+				lookup->accept_reply_unexpected_src = true;
+				break;
+			case 'k':
 				FULLCHECK("unknownformat");
 				lookup->print_unknown_format = state;
+				break;
+			default:
+				goto invalid_option;
+			}
+			break;
+		default:
+			goto invalid_option;
+		}
+
 		break;
 	case 'v':
 		FULLCHECK("vc");

bin/dig/dighost.c

@@ -3602,9 +3602,11 @@ recv_done(isc_task_t *task, isc_event_t *event) {
 			sizeof(buf2));
 			printf(";; reply from unexpected source: %s,"
 			" expected %s\n", buf1, buf2);
+			if (!l->accept_reply_unexpected_src) {
 				match = false;
 			}
 		}
+	}
 
 	result = dns_message_peekheader(&b, &id, &msgflags);
 	if (result != ISC_R_SUCCESS || l->sendmsg->id != id) {

bin/dig/include/dig/dig.h

@@ -141,7 +141,9 @@ struct dig_lookup {
 		idnin,
 		idnout,
 		expandaaaa,
-		qr;
+		qr,
+		accept_reply_unexpected_src;  /*%  print replies from unexpected 
+					           sources. */
 	char textname[MXNAME]; /*% Name we're going to be looking up */
 	char cmdline[MXNAME];
 	dns_rdatatype_t rdtype;