diff --git a/.idea/dictionaries/User.xml b/.idea/dictionaries/User.xml
new file mode 100644
index 0000000..c81001a
--- /dev/null
+++ b/.idea/dictionaries/User.xml
@@ -0,0 +1,3 @@
+<component name="ProjectDictionaryState">
+  <dictionary name="User" />
+</component>
\ No newline at end of file
diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
index 2a97893..afe30f3 100644
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -2,5 +2,12 @@
   <profile version="1.0">
     <option name="myName" value="Project Default" />
     <inspection_tool class="CodeBlock2Expr" enabled="true" level="TEXT ATTRIBUTES" enabled_by_default="true" editorAttributes="CONSIDERATION_ATTRIBUTES" />
+    <inspection_tool class="GrazieInspection" enabled="false" level="GRAMMAR_ERROR" enabled_by_default="false" />
+    <inspection_tool class="LanguageDetectionInspection" enabled="false" level="WARNING" enabled_by_default="false" />
+    <inspection_tool class="SpellCheckingInspection" enabled="false" level="TYPO" enabled_by_default="false">
+      <option name="processCode" value="true" />
+      <option name="processLiterals" value="true" />
+      <option name="processComments" value="true" />
+    </inspection_tool>
   </profile>
 </component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5314bc4..be0f224 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -5,6 +5,11 @@
     <option name="linkedExternalProjectsSettings">
       <MakefileProjectSettings>
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
         <option name="version" value="2" />
       </MakefileProjectSettings>
     </option>
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..752333d
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/port-tunnel.iml" filepath="$PROJECT_DIR$/.idea/port-tunnel.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/port-tunnel.iml b/.idea/port-tunnel.iml
new file mode 100644
index 0000000..2614cb6
--- /dev/null
+++ b/.idea/port-tunnel.iml
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module classpath="External" external.linked.project.id="port-tunnel" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="Makefile" type="CPP_MODULE" version="4" />
\ No newline at end of file
diff --git a/src/Connectors.c b/src/Connectors.c
index e949772..00ceb78 100644
--- a/src/Connectors.c
+++ b/src/Connectors.c
@@ -43,7 +43,8 @@ void ConnectorTCP_construct(ConnectorTCP* ptr, knIPV4Endpoint listener_end, knIP
     if(out_mode == OutputMode_Bind){
         tryLast(knSocketTCP_open(true), m_s, ;);
         ptr->main_sock = m_s.value.VoidPtr;
-        tryLast(knSocketTCP_bindAndListen(ptr->main_sock, connector_end), _m7u7, ;);
+        tryLast(knSocketTCP_bind(ptr->main_sock, connector_end), _m7u7, ;);
+        tryLast(knSocketTCP_listen(ptr->main_sock), _m7u77, ;);
     }
     else if(out_mode == OutputMode_Send){
         tryLast(knSocketTCP_open(false), m_s, ;);
diff --git a/src/ListenerTCP.c b/src/ListenerTCP.c
index 3d25c6f..acd4f74 100644
--- a/src/ListenerTCP.c
+++ b/src/ListenerTCP.c
@@ -4,7 +4,8 @@ void ListenerTCP_construct(ListenerTCP* ptr, knIPV4Endpoint listener_end){
     __PipeStorage_construct(&ptr->pipes);
     tryLast(knSocketTCP_open(true), m_s, ;);
     ptr->main_sock = m_s.value.VoidPtr;
-    tryLast(knSocketTCP_bindAndListen(ptr->main_sock, listener_end), _m7u7, ;);
+    tryLast(knSocketTCP_bind(ptr->main_sock, listener_end), _m7u7, ;);
+    tryLast(knSocketTCP_listen(ptr->main_sock), _m7u77, ;);
     ptr->connector_end = knIPV4Endpoint_INVALID;
 }
 
diff --git a/src/port-tunnel.c b/src/port-tunnel.c
index fde7171..6e8ec76 100644
--- a/src/port-tunnel.c
+++ b/src/port-tunnel.c
@@ -22,6 +22,76 @@ int errs(char* err_msg){
     return -1;
 }
 
+const knIPV4Endpoint listener_end = knIPV4Endpoint_create(knIPV4Address_LOOPBACK, 25565);
+
+Maybe listener() {
+    try(knSocketTCP_open(true), m_sock, ;);
+    kprintf("opened socket\n");
+    knSocketTCP* s = m_sock.value.VoidPtr;
+    try(knSocketTCP_bind(s, listener_end), _m566, knSocketTCP_close(s));
+    try(knSocketTCP_listen(s), _m568, knSocketTCP_close(s));
+    kprintf("listening...\n");
+    try(knSocketTCP_accept(s), m_cs, knSocketTCP_close(s))
+    kprintf("connection has been accepted\n");
+    knSocketTCP* connection = m_cs.value.VoidPtr;
+    InternalPacketMessage msg;
+    try(knSocketTCP_receiveN(connection, &msg, sizeof(InternalPacketMessage), sizeof(InternalPacketMessage)), _m8823, knSocketTCP_close(s))
+    if(msg != InternalPacketMessage_ConnectorHandshake)
+        safethrow("wrong message", ;);
+    kprintf("received connector handshake\n");
+    msg = InternalPacketMessage_ListenerHandshake;
+    try(knSocketTCP_send(connection, &msg, sizeof(msg)), _muu632, knSocketTCP_close(s));
+    kprintf("sent listener handshake\n");
+    knIPV4Endpoint connector_end = connection->remoteEndpoint;
+    try(knSocketTCP_shutdown(connection, knShutdownType_Both), _m7823, knSocketTCP_close(s));
+    try(knSocketTCP_close(connection), _m71823, knSocketTCP_close(s));
+    try(knSocketTCP_close(s), _m718823, ;);
+    
+    try(knSocketTCP_open(false), m_sockc, ;);
+    kprintf("opened connecting socket\n");
+    knSocketTCP* c = m_sockc.value.VoidPtr;
+
+    kprintf("connecting to %s\n", knIPV4Endpoint_toString(connection->remoteEndpoint));
+    sleepMsec(1000);
+    try(knSocketTCP_connect(c, connector_end), _m866, knSocketTCP_close(c));
+
+    return MaybeNull;
+}
+
+Maybe connector() {
+    try(knSocketTCP_open(true), m_sock, ;);
+    kprintf("opened socket\n");
+    knSocketTCP* s = m_sock.value.VoidPtr;
+    sleepMsec(1000);
+    try(knSocketTCP_connect(s, listener_end), _m866, knSocketTCP_close(s));
+    kprintf("connected to listener\n");
+    InternalPacketMessage msg = InternalPacketMessage_ConnectorHandshake;
+    try(knSocketTCP_send(s, &msg, sizeof(msg)), _muu632, ;);
+    kprintf("sent connector handshake\n");
+    try(knSocketTCP_receiveN(s, &msg, sizeof(InternalPacketMessage), sizeof(InternalPacketMessage)), _m8823, ;)
+    if(msg != InternalPacketMessage_ListenerHandshake)
+        safethrow("wrong message", ;);
+    kprintf("received listener handshake\n");
+
+    try(knSocketTCP_open(true), m_l, ;);
+    kprintf("opened listening socket\n");
+    knSocketTCP* l = m_l.value.VoidPtr;
+
+    knIPV4Endpoint public_end = knIPV4Endpoint_INVALID;
+    //TODO: get endpoint from server because s->localEndpoint.port may not match the port in inter network
+
+    try(knSocketTCP_bind(l, public_end), _m173, {knSocketTCP_close(l); knSocketTCP_close(s);});
+    kprintf("bound to %s\n", knIPV4Endpoint_toString(public_end));
+    try(knSocketTCP_listen(l), _m18263, {knSocketTCP_close(l); knSocketTCP_close(s);});
+    kprintf("listening...\n");
+    
+    try(knSocketTCP_accept(l), m_cs, knSocketTCP_close(l))
+    knSocketTCP* connection = m_cs.value.VoidPtr;
+    kprintf("accepted incoming connection\n");
+    
+    return MaybeNull;
+}
+
 #define argIs(STR) cptr_equals(arg, STR)
 
 #define argNext() argv[++argi < argc ? argi : errs(cptr_concat("option '",arg,"' must have a parameter"))]
@@ -46,6 +116,15 @@ int main(int argc, const char* const* argv){
 
     tryLast(kn_tryInit(), _m11257, ;)
 
+    if(argc == 1 || cptr_equals(argv[1], "l")){
+        tryLast(listener(), _m6, ;);
+    }
+    else if(cptr_equals(argv[1], "c")){
+        tryLast(connector(), _m12, ;);
+    }
+    else throw(ERR_KEYNOTFOUND);
+    return 0;
+
     TunnelProtocol tunnel_protocol = TunnelProtocol_None;
     InputMode input_mode = InputMode_None;
     OutputMode output_mode = OutputMode_None;
@@ -167,13 +246,13 @@ int main(int argc, const char* const* argv){
     logDebug(logCtx, "output_mode: %i", output_mode);
     char* temps;
     if(!knIPV4Endpoint_isINVALID(listener_end)){
-        temps = knIPV4Endpoint_toString(&listener_end);
+        temps = knIPV4Endpoint_toString(listener_end);
         logDebug(logCtx, "listener_end: %s", temps);
         free(temps);
     }
     else logDebug(logCtx, "listener_end: INVALID");
     if(!knIPV4Endpoint_isINVALID(connector_end)){
-        temps = knIPV4Endpoint_toString(&connector_end);
+        temps = knIPV4Endpoint_toString(connector_end);
         logDebug(logCtx, "connector_end: %s", temps);
         free(temps);
     }
diff --git a/src/port-tunnel.h b/src/port-tunnel.h
index 098b901..4c6d714 100644
--- a/src/port-tunnel.h
+++ b/src/port-tunnel.h
@@ -185,14 +185,14 @@ void ConnectorTCP_start(ConnectorTCP* ptr);
 ////////////////////////////////////////
 
 typedef union MagicUnion {
-    char array[8];
+    u8 array[8];
     u64 U64;
 } MagicUnion;
 
 typedef enum InternalPacketMessage {
     InternalPacketMessage_ConnectorHandshake,
     InternalPacketMessage_ListenerHandshake,
-} __attribute__((__aligned__(8))) InternalPacketMessage;
+} __attribute__((__aligned__(4))) InternalPacketMessage;
 
 /// connector <-> listener
 typedef struct InternalPacket {
@@ -201,7 +201,7 @@ typedef struct InternalPacket {
     /* 8 bytes */
     union {
         InternalPacketMessage message;
-        char __padding[8];
+        u8 __padding[4];
     };
 } InternalPacket;