ctl: convert record owner letters to lower-case

fixes #668

src/knot/ctl/commands.c

-/*  Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+/*  Copyright (C) 2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -933,6 +933,7 @@ static int create_rrset(knot_rrset_t **rrset, zone_t *zone, ctl_args_t *args,
 		ret = KNOT_EPARSEFAIL;
 		goto parser_failed;
 	}
+	knot_dname_to_lower(scanner->r_owner);
 
 	// Create output rrset.
 	*rrset = knot_rrset_new(scanner->r_owner, scanner->r_type,

tests-extra/tests/ctl/basic/test.py

@@ -215,6 +215,33 @@ isset("TXT" not in resp[ZONE_NAME][ZONE_NAME], "rrset TXT absence in apex")
 isset("A" not in resp[ZONE_NAME]["rrset." + ZONE_NAME], "rrset A absence")
 isset(("node." + ZONE_NAME) not in resp[ZONE_NAME], "node absence")
 
+# Check for proper handling of upper letter-case in the owner name.
+ctl.send_block(cmd="zone-begin")
+resp = ctl.receive_block()
+
+ctl.send_block(cmd="zone-set", zone=ZONE_NAME, owner="lETter", ttl="3600", rtype="TXT", data="text")
+resp = ctl.receive_block()
+
+ctl.send_block(cmd="zone-commit")
+resp = ctl.receive_block()
+
+ctl.send_block(cmd="zone-read", zone=ZONE_NAME, owner="letter")
+resp = ctl.receive_block()
+isset("letter." + ZONE_NAME in resp[ZONE_NAME], "lower-cased and inserted node lETter")
+
+ctl.send_block(cmd="zone-begin")
+resp = ctl.receive_block()
+
+ctl.send_block(cmd="zone-unset", zone=ZONE_NAME, owner="lETter")
+resp = ctl.receive_block()
+
+ctl.send_block(cmd="zone-commit")
+resp = ctl.receive_block()
+
+ctl.send_block(cmd="zone-read", zone=ZONE_NAME)
+resp = ctl.receive_block()
+isset("letter." + ZONE_NAME not in resp[ZONE_NAME], "lower-cased and removed node lETter")
+
 # Purge the zone data.
 ctl.send_block(cmd="zone-purge")
 resp = ctl.receive_block()