libxrdp: work on fastpath, length issue

libxrdp/libxrdp.c

@@ -29,6 +29,7 @@ libxrdp_init(tbus id, struct trans *trans)
 
     session = (struct xrdp_session *)g_malloc(sizeof(struct xrdp_session), 1);
     session->id = id;
+    session->trans = trans;
     session->rdp = xrdp_rdp_create(session, trans);
     session->orders = xrdp_orders_create(session, (struct xrdp_rdp *)session->rdp);
     session->client_info = &(((struct xrdp_rdp *)session->rdp)->client_info);

libxrdp/xrdp_fastpath.c

@@ -58,22 +58,23 @@ xrdp_fastpath_recv(struct xrdp_fastpath *self, struct stream *s)
     int fp_hdr;
     int len = 0;
     int byte;
-    int hdr_len = 2; /* fastpath header lenght - can be 2 or 3 bytes long, depends on length */
+    int hdr_len = 2; /* fastpath header length - can be 2 or 3 bytes long, depends on length */
     DEBUG(("  in xrdp_fastpath_recv"));
 
     /* read the first fastpath byte
      * (we already received it via iso layer */
+    // receive fastpath first length packet
+    init_stream(s, hdr_len);
+    if (trans_force_read_s(self->trans, s, hdr_len) != 0)
+    {
+       return 1;
+    }
     in_uint8(s, fp_hdr); /* fpInputHeader (1 byte) */
 
     self->numEvents = (fp_hdr & 0x3C) >> 2;
     self->secFlags = (fp_hdr & 0xC0) >> 6;
 
     // receive fastpath first length packet
-    if (trans_force_read_s(self->trans, s, 1) != 0)
-    {
-       return 1;
-    }
-
     in_uint8(s, byte); /* length 1 */
 
     if (byte & 0x80)
@@ -81,7 +82,8 @@ xrdp_fastpath_recv(struct xrdp_fastpath *self, struct stream *s)
       byte &= ~(0x80);
       len = (byte << 8);
       // receive fastpath second length packet
-      if (xrdp_tcp_recv(self->tcp_layer, s, 1) != 0)
+      init_stream(s, 1);
+      if (trans_force_read_s(self->trans, s, 1) != 0)
       {
          return 1;
       }
@@ -94,10 +96,11 @@ xrdp_fastpath_recv(struct xrdp_fastpath *self, struct stream *s)
       len = byte;
     }
 
-    //g_writeln("len= %d , numEvents= %d, secFlags= %d, bytesleft: %d", len, self->numEvents, self->secFlags, (s->p - s->data));
+    g_writeln("len= %d , numEvents= %d, secFlags= %d, bytesleft: %d", len, self->numEvents, self->secFlags, (s->p - s->data));
 
     // receive the left bytes
-    if (xrdp_tcp_recv(self->tcp_layer, s, len - hdr_len) != 0)
+    init_stream(s, len - hdr_len);
+    if (trans_force_read_s(self->trans, s, len - hdr_len) != 0)
     {
        return 1;
     }
@@ -166,10 +169,10 @@ xrdp_fastpath_send_update_pdu(struct xrdp_fastpath *self, tui8 updateCode,
 //        s_copy(s_send, s, len);
         s_mark_end(s_send);
 
-        if (xrdp_tcp_send(self->tcp_layer, s_send) != 0)
+//        if (xrdp_tcp_send(self->tcp_layer, s_send) != 0)
-        {
+//        {
-            return 1;
+//            return 1;
-        }
+//        }
     }
 
     return 0;
@@ -220,12 +223,12 @@ xrdp_fastpath_process_data(struct xrdp_fastpath *self, struct stream *s,
 
     encryptionFlags = (header & 0xc0) >> 6;
     numberEvents = (header & 0x3c) >> 2;
-    xrdp_tcp_recv(self->tcp_layer, s, 1);
+//    xrdp_tcp_recv(self->tcp_layer, s, 1);
     in_uint8(s, length);
 
     if (length & 0x80)
     {
-        xrdp_tcp_recv(self->tcp_layer, s, 1);
+//        xrdp_tcp_recv(self->tcp_layer, s, 1);
         in_uint8(s, length2);
         length = (length & 0x7f) << 8 + length2 - 3;
     }
@@ -234,7 +237,7 @@ xrdp_fastpath_process_data(struct xrdp_fastpath *self, struct stream *s,
         length -= 2;
     }
 
-    xrdp_tcp_recv(self->tcp_layer, s, length);
+//    xrdp_tcp_recv(self->tcp_layer, s, length);
 
     if (encryptionFlags != 0)
     {

libxrdp/xrdp_iso.c

@@ -111,7 +111,7 @@ xrdp_iso_recv_msg(struct xrdp_iso *self, struct stream *s, int *code, int *len)
 
     if (ver != 3)
     {
-        return 2; // special code for fastpath
+        return 1;
     }
 
     in_uint8s(s, 1);

libxrdp/xrdp_mcs.c

@@ -122,21 +122,11 @@ xrdp_mcs_recv(struct xrdp_mcs *self, struct stream *s, int *chan)
     int len;
     int userid;
     int chanid;
-    int iso_msg;
     DEBUG(("  in xrdp_mcs_recv"));
 
     while (1)
     {
-
+        if (xrdp_iso_recv(self->iso_layer, s) != 0)
-        iso_msg = xrdp_iso_recv(self->iso_layer, s);
-
-        if (iso_msg == 2) // non-TPKT header
-        {
-            DEBUG(("  out xrdp_mcs_recv, non-TPKT header detected, we try fastpath"));
-            return iso_msg;
-        }
-
-        if (iso_msg == 1) // error
         {
             DEBUG(("   out xrdp_mcs_recv, xrdp_iso_recv return non zero"));
             return 1;

libxrdp/xrdp_rdp.c

@@ -299,20 +299,30 @@ xrdp_rdp_recv(struct xrdp_rdp *self, struct stream *s, int *code)
     int len = 0;
     int pdu_code = 0;
     int chan = 0;
+    const tui8 *header;
+    header = (const tui8 *) (self->session->trans->in_s->p);
 
     DEBUG(("in xrdp_rdp_recv"));
 
+    /* not fastpath, do tpkt */
     if (s->next_packet == 0 || s->next_packet >= s->end)
     {
-        chan = 0;
+        /* check for fastpath first */
-        error = xrdp_sec_recv(self->sec_layer, s, &chan);
+        g_writeln("xrdp_rdp_recv: header= 0x%8.8x", header[0]);
 
-        if (error == 2) /* we have fastpath packet! */
+        if ((header[0] & 0x3) == 0 && (header[0] != 0x3c))
         {
-            *code = 2;
+            if (xrdp_sec_recv_fastpath(self->sec_layer, s) != 0)
+            {
+              return 1;
+            }
+            *code = 2; // special code for fastpath
             return 0;
         }
 
+        chan = 0;
+        error = xrdp_sec_recv(self->sec_layer, s, &chan);
+
         if (error == -1) /* special code for send demand active */
         {
             s->next_packet = 0;

libxrdp/xrdp_sec.c

@@ -972,23 +972,12 @@ xrdp_sec_recv(struct xrdp_sec *self, struct stream *s, int *chan)
 {
     int flags;
     int len;
-    int mcs_msg;
     int ver;
     int pad;
 
-
     DEBUG((" in xrdp_sec_recv"));
 
-    mcs_msg = xrdp_mcs_recv(self->mcs_layer, s, chan);
+    if (xrdp_mcs_recv(self->mcs_layer, s, chan) != 0)
-
-    if (mcs_msg == 2)
-    {
-        xrdp_sec_recv_fastpath(self, s);
-        DEBUG((" out xrdp_sec_recv : non-TPKT msg detected, we try fastpath"));
-        return mcs_msg;
-    }
-
-    if (mcs_msg == 1)
     {
         DEBUG((" out xrdp_sec_recv : error"));
         return 1;

xrdp/xrdp_process.c

@@ -123,6 +123,7 @@ xrdp_process_get_pdu_bytes(const char *aheader)
 
     rv = -1;
     header = (const tui8 *) aheader;
+
     if (header[0] == 0x03)
     {
         /* TPKT */