[tao-bugs] [TAO] Changing interface status after startup cause incomplete IOR

[Schuele, Benjamin]

    TAO VERSION: 2.2.0
    ACE VERSION: 6.2.0

    HOST MACHINE and OPERATING SYSTEM:
        Ubuntu 14.04.3 LTS

    THE $ACE_ROOT/ace/config.h FILE 
         #include "ace/config-linux.h"

    COMPILER NAME AND VERSION (AND PATCHLEVEL):
        gcc (Ubuntu 4.8.4-2ubuntu1~14.04) 4.8.4

    THE $ACE_ROOT/include/makeinclude/platform_macros.GNU FILE 
        cross_compile=1
        shared_libs=1
        static_libs=0
        debug=1
        optimize=0
        inline=1
        ssl=0
        no_hidden_visibility=1
        TAO_IDL = /home/..../bin/tao_idl
        include $ACE_ROOT/include/makeinclude/platform_linux.GNU
        TAO_IDL_PREPROCESSOR = /usr/bin/g++

    AREA/CLASS/EXAMPLE AFFECTED:
        TAO/examples/Simple/chat

    DOES THE PROBLEM AFFECT:
        COMPILATION?
            no
        LINKING?
           no
        EXECUTION?
           yes

    SYNOPSIS:
        If a computer running a corba program get an IP (over DHCP) after object generation, the IOR send to other computers misses the new IP.

    DESCRIPTION:
       We have a simple network device and a PC program talking each other with corba. In order to work without name resolution, we use the "-ORBDottedDecimalAddresses 1" option. If the user power up the device and connecting the network cable after the software is started, all GIOP call from the device sending an IOR to the computer misses the new IP. This cause the computer program to not be able to use this object pointer.

    REPEAT BY:
       I was able to reproduce the exact same behavior with the a slightly patched (see patch blow) chat example on two computers. The steps to reproduce are:
         1. start server on computer A with: ./server -ORBObjRefStyle URL -ORBDottedDecimalAddresses 1 -o /media/exchange/chat.ior.txt
         2. copy the chat.ior.txt to computer B
         3. disconnect the network to the computer B
         4. start the client on computer B with: ./client -n remote -ORBDottedDecimalAddresses 1 -ORBObjRefStyle URL -f ./chat.ior.txt
         5. reconnect the network  to the computer B
         6. enter a chat message

       Below you see the error i got on the server. Interestingly the client started on A sees the chat messages from the client on B, but the client on B receives no chat messages at all from the server. The captured GIOP packet below is the "add" call from the client on B to the server on A.

    SAMPLE FIX/WORKAROUND:
     nothing, no idea where the bad things happens in the code.

----------------------------------- error message --------------------------------------------
(28014|140705385342784) EXCEPTION, Failed to send a message

system exception, ID 'IDL:omg.org/CORBA/TRANSIENT:1.0'
OMG minor code (2), described as 'No usable profile in IOR.', completed = NO


----------------------------------- GIOP add call ---------------------------------------------
0000   47 49 4f 50 01 02 01 00 b3 00 00 00 02 00 00 00  GIOP............
0010   03 00 00 00 00 00 00 00 1b 00 00 00 14 01 0f 00  ................
0020   52 53 54 62 c0 de 55 38 db 01 00 00 00 00 00 01  RSTb..U8........
0030   00 00 00 01 00 00 00 00 04 00 00 00 61 64 64 00  ............add.
0040   00 00 00 00 00 00 00 00 11 00 00 00 49 44 4c 3a  ............IDL:
0050   52 65 63 65 69 76 65 72 3a 31 2e 30 00 2e 30 00  Receiver:1.0..0.
0060   01 00 00 00 00 00 00 00 48 00 00 00 01 01 02 00  ........H.......
0070   0a 00 00 00 31 32 37 2e 30 2e 30 2e 31 00 31 cf  ....127.0.0.1.1.
0080   1b 00 00 00 14 01 0f 00 52 53 54 1b de de 55 a8  ........RST...U.
0090   ee 07 00 00 00 00 00 01 00 00 00 01 00 00 00 00  ................
00a0   01 00 00 00 00 00 00 00 08 00 00 00 01 27 ce c1  .............'..
00b0   00 4f 41 54 07 00 00 00 72 65 6d 6f 74 65 00     .OAT....remote.


--------------------------------------- chat.patch -----------------------------------------------------------
--- ACE_wrappers.org/TAO/examples/Simple/chat/Client_i.cpp
+++ ACE_wrappers/TAO/examples/Simple/chat/Client_i.cpp
@@ -94,22 +94,37 @@
                            this->ior_file_name_),
                           -1);
 
-      CORBA::Object_var server_object =
-        orb->string_to_object (this->ior_.c_str ());
-
-      if (CORBA::is_nil (server_object.in ()))
-        ACE_ERROR_RETURN ((LM_ERROR,
-                           ACE_TEXT ("invalid ior <%C>\n"),
-                           this->ior_.c_str ()),
-                          -1);
-
-      this->server_ = Broadcaster::_narrow (server_object.in ());
-      if (CORBA::is_nil (this->server_.in ()))
-        {
-          ACE_ERROR_RETURN ((LM_ERROR,
-                             ACE_TEXT ("Nil Server\n")),
-                            -1);
-        }
+     bool gotException;
+      do
+      {
+         try
+         {
+	      CORBA::Object_var server_object =
+	        orb->string_to_object (this->ior_.c_str ());
+
+	      if (CORBA::is_nil (server_object.in ()))
+	        ACE_ERROR_RETURN ((LM_ERROR,
+	                           ACE_TEXT ("invalid ior <%C>\n"),
+	                           this->ior_.c_str ()),
+	                          -1);
+
+	      this->server_ = Broadcaster::_narrow (server_object.in ());
+	      if (CORBA::is_nil (this->server_.in ()))
+	        {
+	          ACE_ERROR_RETURN ((LM_ERROR,
+	                             ACE_TEXT ("Nil Server\n")),
+	                            -1);
+	        }
+		gotException = false;
+          }
+          catch (const CORBA::Exception& ex)
+	  {
+	    ex._tao_print_exception ("client_i::init\n");
+	    gotException = true;
+	  }
+	}
+	while(gotException);
+
     }
   catch (const CORBA::Exception& ex)
     {
--------------------------------------- chat.patch -----------------------------------------------------------