More allow_zero_length_clientid fixes.

Closes #1429. Thanks to Dustin Sallings.

ChangeLog.txt

@@ -1,6 +1,7 @@
 Broker:
-- allow_zero_length_clientid wasn't being used by the default listener, making
+- Various fixes for `allow_zero_length_clientid` config, where this option was
-  it impossible to turn this option off.
+  not being set correctly. Closes #1429.
+
 
 1.6.7 - 20190925
 ================

src/conf.c

@@ -271,6 +271,7 @@ void config__init(struct mosquitto_db *db, struct mosquitto__config *config)
 	config->default_listener.max_connections = -1;
 	config->default_listener.protocol = mp_mqtt;
 	config->default_listener.security_options.allow_anonymous = -1;
+	config->default_listener.security_options.allow_zero_length_clientid = true;
 	config->default_listener.maximum_qos = 2;
 	config->default_listener.max_topic_alias = 10;
 }
@@ -471,6 +472,7 @@ int config__parse_args(struct mosquitto_db *db, struct mosquitto__config *config
 			|| config->default_listener.security_options.psk_file
 			|| config->default_listener.security_options.auth_plugin_config_count
 			|| config->default_listener.security_options.allow_anonymous != -1
+			|| config->default_listener.security_options.allow_zero_length_clientid != true
 			){
 
 		config->listener_count++;
@@ -1389,6 +1391,7 @@ int config__read_file_core(struct mosquitto__config *config, bool reload, struct
 						}
 
 						cur_listener->security_options.allow_anonymous = -1;
+						cur_listener->security_options.allow_zero_length_clientid = true;
 						cur_listener->protocol = mp_mqtt;
 						cur_listener->port = tmp_int;
 						cur_listener->maximum_qos = 2;

test/broker/01-connect-zero-length-id.py

@@ -11,9 +11,11 @@ def write_config(filename, port1, port2, per_listener, allow_zero):
     with open(filename, 'w') as f:
         f.write("per_listener_settings %s\n" % (per_listener))
         f.write("port %d\n" % (port2))
-        f.write("allow_zero_length_clientid %s\n" % (allow_zero))
+        if allow_zero != "":
+            f.write("allow_zero_length_clientid %s\n" % (allow_zero))
         f.write("listener %d\n" % (port1))
-        f.write("allow_zero_length_clientid %s\n" % (allow_zero))
+        if allow_zero != "":
+            f.write("allow_zero_length_clientid %s\n" % (allow_zero))
 
 
 def do_test(per_listener, proto_ver, clean_start, allow_zero, client_port, expect_fail):
@@ -53,6 +55,7 @@ def do_test(per_listener, proto_ver, clean_start, allow_zero, client_port, expec
         if rc:
             print(stde.decode('utf-8'))
             print("per_listener:%s proto_ver:%d client_port:%d clean_start:%d allow_zero:%s" % (per_listener, proto_ver, client_port, clean_start, allow_zero))
+            print("port1:%d port2:%d" % (port1, port2))
             exit(rc)
 
 
@@ -80,6 +83,16 @@ if test_v4 == True:
     do_test(per_listener="true", proto_ver=4, client_port=port2, clean_start=False, allow_zero="true", expect_fail=True)
     do_test(per_listener="true", proto_ver=4, client_port=port2, clean_start=False, allow_zero="false", expect_fail=True)
 
+    do_test(per_listener="false", proto_ver=4, client_port=port1, clean_start=True, allow_zero="", expect_fail=False)
+    do_test(per_listener="false", proto_ver=4, client_port=port1, clean_start=False, allow_zero="", expect_fail=True)
+    do_test(per_listener="true", proto_ver=4, client_port=port1, clean_start=True, allow_zero="", expect_fail=False)
+    do_test(per_listener="true", proto_ver=4, client_port=port1, clean_start=False, allow_zero="", expect_fail=True)
+
+    do_test(per_listener="false", proto_ver=4, client_port=port2, clean_start=True, allow_zero="", expect_fail=False)
+    do_test(per_listener="false", proto_ver=4, client_port=port2, clean_start=False, allow_zero="", expect_fail=True)
+    do_test(per_listener="true", proto_ver=4, client_port=port2, clean_start=True, allow_zero="", expect_fail=False)
+    do_test(per_listener="true", proto_ver=4, client_port=port2, clean_start=False, allow_zero="", expect_fail=True)
+
 if test_v5 == True:
     do_test(per_listener="false", proto_ver=5, client_port=port1, clean_start=True, allow_zero="true", expect_fail=False)
     do_test(per_listener="false", proto_ver=5, client_port=port1, clean_start=True, allow_zero="false", expect_fail=True)
@@ -99,4 +112,14 @@ if test_v5 == True:
     do_test(per_listener="true", proto_ver=5, client_port=port2, clean_start=False, allow_zero="true", expect_fail=False)
     do_test(per_listener="true", proto_ver=5, client_port=port2, clean_start=False, allow_zero="false", expect_fail=True)
 
+    do_test(per_listener="false", proto_ver=5, client_port=port1, clean_start=True, allow_zero="", expect_fail=False)
+    do_test(per_listener="false", proto_ver=5, client_port=port1, clean_start=False, allow_zero="", expect_fail=False)
+    do_test(per_listener="true", proto_ver=5, client_port=port1, clean_start=True, allow_zero="", expect_fail=False)
+    do_test(per_listener="true", proto_ver=5, client_port=port1, clean_start=False, allow_zero="", expect_fail=False)
+
+    do_test(per_listener="false", proto_ver=5, client_port=port2, clean_start=True, allow_zero="", expect_fail=False)
+    do_test(per_listener="false", proto_ver=5, client_port=port2, clean_start=False, allow_zero="", expect_fail=False)
+    do_test(per_listener="true", proto_ver=5, client_port=port2, clean_start=True, allow_zero="", expect_fail=False)
+    do_test(per_listener="true", proto_ver=5, client_port=port2, clean_start=False, allow_zero="", expect_fail=False)
+
 exit(0)