diff --git a/xup/xup.c b/xup/xup.c
index 8ddc079f..8e28e7ab 100644
--- a/xup/xup.c
+++ b/xup/xup.c
@@ -20,6 +20,7 @@
 
 #include "xup.h"
 #include "log.h"
+#include "trans.h"
 
 #define LOG_LEVEL 1
 #define LLOG(_level, _args) \
@@ -27,98 +28,14 @@
 #define LLOGLN(_level, _args) \
     do { if (_level < LOG_LEVEL) { g_writeln _args ; } } while (0)
 
-/******************************************************************************/
-/* returns error */
-int DEFAULT_CC
-lib_recv(struct mod *mod, char *data, int len)
-{
-    int rcvd;
-
-    if (mod->sck_closed)
-    {
-        return 1;
-    }
-
-    while (len > 0)
-    {
-        rcvd = g_tcp_recv(mod->sck, data, len, 0);
-
-        if (rcvd == -1)
-        {
-            if (g_tcp_last_error_would_block(mod->sck))
-            {
-                if (mod->server_is_term(mod))
-                {
-                    return 1;
-                }
-
-                g_tcp_can_recv(mod->sck, 10);
-            }
-            else
-            {
-                return 1;
-            }
-        }
-        else if (rcvd == 0)
-        {
-            mod->sck_closed = 1;
-            return 1;
-        }
-        else
-        {
-            data += rcvd;
-            len -= rcvd;
-        }
-    }
-
-    return 0;
-}
+static int APP_CC
+lib_mod_process_message(struct mod *mod, struct stream *s);
 
-/*****************************************************************************/
-/* returns error */
-int DEFAULT_CC
-lib_send(struct mod *mod, char *data, int len)
+/******************************************************************************/
+static int APP_CC
+lib_send_copy(struct mod *mod, struct stream *s)
 {
-    int sent;
-
-    if (mod->sck_closed)
-    {
-        return 1;
-    }
-
-    while (len > 0)
-    {
-        sent = g_tcp_send(mod->sck, data, len, 0);
-
-        if (sent == -1)
-        {
-            if (g_tcp_last_error_would_block(mod->sck))
-            {
-                if (mod->server_is_term(mod))
-                {
-                    return 1;
-                }
-
-                g_tcp_can_send(mod->sck, 10);
-            }
-            else
-            {
-                return 1;
-            }
-        }
-        else if (sent == 0)
-        {
-            mod->sck_closed = 1;
-            return 1;
-        }
-        else
-        {
-            data += sent;
-            len -= sent;
-        }
-    }
-
-    return 0;
+    return trans_write_copy_s(mod->trans, s);
 }
 
 /******************************************************************************/
@@ -144,7 +61,7 @@ lib_mod_log_peer(struct mod *mod)
     int gid;
 
     my_pid = g_getpid();
-    if (g_sck_get_peer_cred(mod->sck, &pid, &uid, &gid) == 0)
+    if (g_sck_get_peer_cred(mod->trans->sck, &pid, &uid, &gid) == 0)
     {
         log_message(LOG_LEVEL_INFO, "lib_mod_log_peer: xrdp_pid=%d connected "
                     "to X11rdp_pid=%d X11rdp_uid=%d X11rdp_gid=%d "
@@ -161,6 +78,57 @@ lib_mod_log_peer(struct mod *mod)
     return 0;
 }
 
+/******************************************************************************/
+static int APP_CC
+lib_data_in(struct trans *trans)
+{
+    struct mod *self;
+    struct stream *s;
+    int len;
+
+    if (trans == 0)
+    {
+        return 1;
+    }
+
+    self = (struct mod *)(trans->callback_data);
+    s = trans_get_in_s(trans);
+
+    if (s == 0)
+    {
+        return 1;
+    }
+
+    switch (trans->extra_flags)
+    {
+        case 1:
+            s->p = s->data;
+            in_uint8s(s, 4); /* processed later in lib_mod_process_message */
+            in_uint32_le(s, len);
+            if (len < 0 || len > 128 * 1024)
+            {
+                g_writeln("lib_data_in: bad size");
+                return 1;
+            }
+            trans->header_size = len + 8;
+            trans->extra_flags = 2;
+            break;
+        case 2:
+            s->p = s->data;
+            if (lib_mod_process_message(self, s) != 0)
+            {
+                g_writeln("lib_data_in: lib_mod_process_message failed");
+                return 1;
+            }
+            init_stream(s, 0);
+            trans->header_size = 8;
+            trans->extra_flags = 1;
+            break;
+    }
+
+    return 0;
+}
+
 /******************************************************************************/
 /* return error */
 int DEFAULT_CC
@@ -169,7 +137,6 @@ lib_mod_connect(struct mod *mod)
     int error;
     int len;
     int i;
-    int index;
     int use_uds;
     struct stream *s;
     char con_port[256];
@@ -207,64 +174,34 @@ lib_mod_connect(struct mod *mod)
     mod->sck_closed = 0;
     i = 0;
 
-    while (1)
+    if (use_uds)
     {
-        if (use_uds)
+        mod->trans = trans_create(TRANS_MODE_UNIX, 8 * 8192, 8192);
+        if (mod->trans == 0)
         {
-            mod->sck = g_tcp_local_socket();
-            if (mod->sck < 0)
-            {
-                free_stream(s);
-                return 1;
-            }
+            free_stream(s);
+            return 1;
         }
-        else
+    }
+    else
+    {
+        mod->trans = trans_create(TRANS_MODE_TCP, 8 * 8192, 8192);
+        if (mod->trans == 0)
         {
-            mod->sck = g_tcp_socket();
-            if (mod->sck < 0)
-            {
-                free_stream(s);
-                return 1;
-            }
-
-            g_tcp_set_non_blocking(mod->sck);
-            g_tcp_set_no_delay(mod->sck);
+            free_stream(s);
+            return 1;
         }
+    }
 
-        /* mod->server_msg(mod, "connecting...", 0); */
+    while (1)
+    {
 
-        if (use_uds)
-        {
-            error = g_tcp_local_connect(mod->sck, con_port);
-        }
-        else
-        {
-            error = g_tcp_connect(mod->sck, mod->ip, con_port);
-        }
+        /* mod->server_msg(mod, "connecting...", 0); */
 
-        if (error == -1)
+        error = -1;
+        if (trans_connect(mod->trans, mod->ip, con_port, 3000) == 0)
         {
-            if (g_tcp_last_error_would_block(mod->sck))
-            {
-                error = 0;
-                index = 0;
-
-                while (!g_tcp_can_send(mod->sck, 100))
-                {
-                    index++;
-
-                    if ((index >= 30) || mod->server_is_term(mod))
-                    {
-                        mod->server_msg(mod, "connect timeout", 0);
-                        error = 1;
-                        break;
-                    }
-                }
-            }
-            else
-            {
-                /* mod->server_msg(mod, "connect error", 0); */
-            }
+            error = 0;
         }
 
         if (error == 0)
@@ -272,8 +209,6 @@ lib_mod_connect(struct mod *mod)
             break;
         }
 
-        g_tcp_close(mod->sck);
-        mod->sck = 0;
         i++;
 
         if (i >= 60)
@@ -308,7 +243,7 @@ lib_mod_connect(struct mod *mod)
         len = (int)(s->end - s->data);
         s_pop_layer(s, iso_hdr);
         out_uint32_le(s, len);
-        lib_send(mod, s->data, len);
+        lib_send_copy(mod, s);
     }
 
     if (error == 0)
@@ -326,7 +261,7 @@ lib_mod_connect(struct mod *mod)
         len = (int)(s->end - s->data);
         s_pop_layer(s, iso_hdr);
         out_uint32_le(s, len);
-        lib_send(mod, s->data, len);
+        lib_send_copy(mod, s);
     }
 
     if (error == 0)
@@ -348,13 +283,15 @@ lib_mod_connect(struct mod *mod)
         len = (int)(s->end - s->data);
         s_pop_layer(s, iso_hdr);
         out_uint32_le(s, len);
-        lib_send(mod, s->data, len);
+        lib_send_copy(mod, s);
     }
 
     free_stream(s);
 
     if (error != 0)
     {
+        trans_delete(mod->trans);
+        mod->trans = 0;
         mod->server_msg(mod, "some problem", 0);
         LIB_DEBUG(mod, "out lib_mod_connect error");
         return 1;
@@ -362,7 +299,11 @@ lib_mod_connect(struct mod *mod)
     else
     {
         mod->server_msg(mod, "connected ok", 0);
-        mod->sck_obj = g_create_wait_obj_from_socket(mod->sck, 0);
+        mod->trans->trans_data_in = lib_data_in;
+        mod->trans->header_size = 8;
+        mod->trans->callback_data = mod;
+        mod->trans->no_stream_init_on_data_in = 1;
+        mod->trans->extra_flags = 1;
     }
 
     LIB_DEBUG(mod, "out lib_mod_connect");
@@ -411,7 +352,7 @@ lib_mod_event(struct mod *mod, int msg, tbus param1, tbus param2,
                     len = (int)(s->end - s->data);
                     s_pop_layer(s, iso_hdr);
                     out_uint32_le(s, len);
-                    lib_send(mod, s->data, len);
+                    lib_send_copy(mod, s);
                 }
             }
 
@@ -434,7 +375,7 @@ lib_mod_event(struct mod *mod, int msg, tbus param1, tbus param2,
     len = (int)(s->end - s->data);
     s_pop_layer(s, iso_hdr);
     out_uint32_le(s, len);
-    rv = lib_send(mod, s->data, len);
+    rv = lib_send_copy(mod, s);
     free_stream(s);
     LIB_DEBUG(mod, "out lib_mod_event");
     return rv;
@@ -1092,7 +1033,7 @@ send_paint_rect_ack(struct mod *mod, int flags, int x, int y, int cx, int cy,
     len = (int)(s->end - s->data);
     s_pop_layer(s, iso_hdr);
     out_uint32_le(s, len);
-    lib_send(mod, s->data, len);
+    lib_send_copy(mod, s);
     free_stream(s);
     return 0;
 }
@@ -1100,7 +1041,7 @@ send_paint_rect_ack(struct mod *mod, int flags, int x, int y, int cx, int cy,
 /******************************************************************************/
 /* return error */
 static int APP_CC
-process_server_paint_rect_shmem(struct mod *mod, struct stream *s)
+process_server_paint_rect_shmem(struct mod *amod, struct stream *s)
 {
     int rv;
     int x;
@@ -1132,37 +1073,33 @@ process_server_paint_rect_shmem(struct mod *mod, struct stream *s)
 
     bmpdata = 0;
     rv = 0;
-
-    if (flags == 0) /* screen */
+    if (amod->screen_shmem_id_mapped == 0)
     {
-        if (mod->screen_shmem_id_mapped == 0)
+        amod->screen_shmem_id = shmem_id;
+        amod->screen_shmem_pixels = g_shmat(amod->screen_shmem_id);
+        if (amod->screen_shmem_pixels == (void*)-1)
         {
-            mod->screen_shmem_id = shmem_id;
-            mod->screen_shmem_pixels = g_shmat(mod->screen_shmem_id);
-            if (mod->screen_shmem_pixels == (void*)-1)
-            {
-                /* failed */
-                mod->screen_shmem_id = 0;
-                mod->screen_shmem_pixels = 0;
-                mod->screen_shmem_id_mapped = 0;
-            }
-            else
-            {
-                mod->screen_shmem_id_mapped = 1;
-            }
+            /* failed */
+            amod->screen_shmem_id = 0;
+            amod->screen_shmem_pixels = 0;
+            amod->screen_shmem_id_mapped = 0;
         }
-        if (mod->screen_shmem_pixels != 0)
+        else
         {
-            bmpdata = mod->screen_shmem_pixels + shmem_offset;
+            amod->screen_shmem_id_mapped = 1;
         }
     }
+    if (amod->screen_shmem_pixels != 0)
+    {
+        bmpdata = amod->screen_shmem_pixels + shmem_offset;
+    }
     if (bmpdata != 0)
     {
-        rv = mod->server_paint_rect(mod, x, y, cx, cy,
-                                    bmpdata, width, height,
-                                    srcx, srcy);
+        rv = amod->server_paint_rect(amod, x, y, cx, cy,
+                                     bmpdata, width, height,
+                                     srcx, srcy);
     }
-    send_paint_rect_ack(mod, flags, x, y, cx, cy, frame_id);
+    send_paint_rect_ack(amod, flags, x, y, cx, cy, frame_id);
     return rv;
 }
 
@@ -1184,7 +1121,7 @@ send_paint_rect_ex_ack(struct mod *mod, int flags, int frame_id)
     len = (int)(s->end - s->data);
     s_pop_layer(s, iso_hdr);
     out_uint32_le(s, len);
-    lib_send(mod, s->data, len);
+    lib_send_copy(mod, s);
     free_stream(s);
     return 0;
 }
@@ -1421,17 +1358,16 @@ lib_send_client_info(struct mod *mod)
     len = (int)(s->end - s->data);
     s_pop_layer(s, iso_hdr);
     out_uint32_le(s, len);
-    lib_send(mod, s->data, len);
+    lib_send_copy(mod, s);
     free_stream(s);
     return 0;
 }
 
 /******************************************************************************/
 /* return error */
-int DEFAULT_CC
-lib_mod_signal(struct mod *mod)
+static int APP_CC
+lib_mod_process_message(struct mod *mod, struct stream *s)
 {
-    struct stream *s;
     int num_orders;
     int index;
     int rv;
@@ -1439,11 +1375,7 @@ lib_mod_signal(struct mod *mod)
     int type;
     char *phold;
 
-    LIB_DEBUG(mod, "in lib_mod_signal");
-    make_stream(s);
-    init_stream(s, 8192);
-    rv = lib_recv(mod, s->data, 8);
-
+    rv = 0;
     if (rv == 0)
     {
         in_uint16_le(s, type);
@@ -1452,72 +1384,54 @@ lib_mod_signal(struct mod *mod)
 
         if (type == 1) /* original order list */
         {
-            init_stream(s, len);
-            rv = lib_recv(mod, s->data, len);
-
-            if (rv == 0)
+            for (index = 0; index < num_orders; index++)
             {
-                for (index = 0; index < num_orders; index++)
-                {
-                    in_uint16_le(s, type);
-                    rv = lib_mod_process_orders(mod, type, s);
+                in_uint16_le(s, type);
+                rv = lib_mod_process_orders(mod, type, s);
 
-                    if (rv != 0)
-                    {
-                        break;
-                    }
+                if (rv != 0)
+                {
+                    break;
                 }
             }
         }
         else if (type == 2) /* caps */
         {
-            g_writeln("lib_mod_signal: type 2 len %d", len);
-            init_stream(s, len);
-            rv = lib_recv(mod, s->data, len);
-
-            if (rv == 0)
+            g_writeln("lib_mod_process_message: type 2 len %d", len);
+            for (index = 0; index < num_orders; index++)
             {
-                for (index = 0; index < num_orders; index++)
+                phold = s->p;
+                in_uint16_le(s, type);
+                in_uint16_le(s, len);
+
+                switch (type)
                 {
-                    phold = s->p;
-                    in_uint16_le(s, type);
-                    in_uint16_le(s, len);
-
-                    switch (type)
-                    {
-                        default:
-                            g_writeln("lib_mod_signal: unknown cap type %d len %d",
-                                      type, len);
-                            break;
-                    }
-
-                    s->p = phold + len;
+                    default:
+                        g_writeln("lib_mod_process_message: unknown cap type %d len %d",
+                                  type, len);
+                        break;
                 }
 
-                lib_send_client_info(mod);
+                s->p = phold + len;
             }
+
+            lib_send_client_info(mod);
         }
         else if (type == 3) /* order list with len after type */
         {
-            init_stream(s, len);
-            rv = lib_recv(mod, s->data, len);
-
-            if (rv == 0)
+            for (index = 0; index < num_orders; index++)
             {
-                for (index = 0; index < num_orders; index++)
-                {
-                    phold = s->p;
-                    in_uint16_le(s, type);
-                    in_uint16_le(s, len);
-                    rv = lib_mod_process_orders(mod, type, s);
-
-                    if (rv != 0)
-                    {
-                        break;
-                    }
+                phold = s->p;
+                in_uint16_le(s, type);
+                in_uint16_le(s, len);
+                rv = lib_mod_process_orders(mod, type, s);
 
-                    s->p = phold + len;
+                if (rv != 0)
+                {
+                    break;
                 }
+
+                s->p = phold + len;
             }
         }
         else
@@ -1526,11 +1440,18 @@ lib_mod_signal(struct mod *mod)
         }
     }
 
-    free_stream(s);
-    LIB_DEBUG(mod, "out lib_mod_signal");
     return rv;
 }
 
+/******************************************************************************/
+/* return error */
+int DEFAULT_CC
+lib_mod_signal(struct mod *mod)
+{
+    g_writeln("lib_mod_signal: not used");
+    return 0;
+}
+
 /******************************************************************************/
 /* return error */
 int DEFAULT_CC
@@ -1579,19 +1500,14 @@ int DEFAULT_CC
 lib_mod_get_wait_objs(struct mod *mod, tbus *read_objs, int *rcount,
                       tbus *write_objs, int *wcount, int *timeout)
 {
-    int i;
-
-    i = *rcount;
-
     if (mod != 0)
     {
-        if (mod->sck_obj != 0)
+        if (mod->trans != 0)
         {
-            read_objs[i++] = mod->sck_obj;
+            trans_get_wait_objs_rw(mod->trans, read_objs, rcount,
+                                   write_objs, wcount);
         }
     }
-
-    *rcount = i;
     return 0;
 }
 
@@ -1603,15 +1519,11 @@ lib_mod_check_wait_objs(struct mod *mod)
     int rv;
 
     rv = 0;
-
     if (mod != 0)
     {
-        if (mod->sck_obj != 0)
+        if (mod->trans != 0)
         {
-            if (g_is_wait_obj_set(mod->sck_obj))
-            {
-                rv = lib_mod_signal(mod);
-            }
+            rv = trans_check_wait_objs(mod->trans);
         }
     }
 
@@ -1658,9 +1570,7 @@ mod_exit(struct mod *mod)
     {
         return 0;
     }
-
-    g_delete_wait_obj_from_socket(mod->sck_obj);
-    g_tcp_close(mod->sck);
+    trans_delete(mod->trans);
     g_free(mod);
     return 0;
 }
diff --git a/xup/xup.h b/xup/xup.h
index 3a569c7f..b7ec142c 100644
--- a/xup/xup.h
+++ b/xup/xup.h
@@ -162,4 +162,5 @@ struct mod
   int screen_shmem_id;
   int screen_shmem_id_mapped; /* boolean */
   char *screen_shmem_pixels;
+  struct trans *trans;
 };