Repair vlib API socket server

- Teach vpp_api_test to send/receive API messages over sockets
- Add memfd-based shared memory
- Add api messages to create memfd-based shared memory segments
- vpp_api_test supports both socket and shared memory segment connections
- vpp_api_test pivot from socket to shared memory API messaging
- add socket client support to libvlibclient.so
- dead client reaper sends ping messages, container-friendly
- dead client reaper falls back to kill (<pid>, 0) live checking
  if e.g. a python app goes silent for tens of seconds
- handle ping messages in python client support code
- teach show api ring about pairwise shared-memory segments
- fix ip probing of already resolved destinations (VPP-998)

We'll need this work to implement proper host-stack client isolation

Change-Id: Ic23b65f75c854d0393d9a2e9d6b122a9551be769
Signed-off-by: Dave Barach <dave@barachs.net>
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 31 insertions, 7 deletions

diff --git a/src/vat/main.c b/src/vat/main.c
index 1bad2ebb14d..e2c9b70889a 100644
--- a/src/vat/main.c
+++ b/src/vat/main.c
@@ -190,6 +190,17 @@ do_one_file (vat_main_t * vam)
 	  vam->regenerate_interface_table = 0;
 	  api_sw_interface_dump (vam);
 	}
+
+      /* Hack to pick up new client index after memfd_segment_create pivot */
+      if (vam->client_index_invalid)
+	{
+	  vat_main_t *vam = &vat_main;
+	  api_main_t *am = &api_main;
+
+	  vam->vl_input_queue = am->shmem_hdr->vl_input_queue;
+	  vam->my_client_index = am->my_client_index;
+	  vam->client_index_invalid = 0;
+	}
     }
 }
 
@@ -313,6 +324,8 @@ main (int argc, char **argv)
 			  eval_current_line);
 
   init_error_string_table (vam);
+  vec_validate (vam->cmd_reply, 0);
+  vec_reset_length (vam->cmd_reply);
 
   unformat_init_command_line (a, argv);
 
@@ -326,6 +339,12 @@ main (int argc, char **argv)
 	interactive = 0;
       else if (unformat (a, "json"))
 	json_output = 1;
+      else if (unformat (a, "socket-name %s", &vam->socket_name))
+	;
+      else if (unformat (a, "default-socket"))
+	{
+	  vam->socket_name = format (0, "%s%c", API_SOCKET_FILE, 0);
+	}
       else if (unformat (a, "plugin_path %s", (u8 *) & vat_plugin_path))
 	vec_add1 (vat_plugin_path, 0);
       else if (unformat (a, "plugin_name_filter %s",
@@ -337,9 +356,12 @@ main (int argc, char **argv)
 	}
       else
 	{
-	  fformat (stderr,
-		   "%s: usage [in <f1> ... in <fn>] [out <fn>] [script] [json]\n",
-		   argv[0]);
+	  fformat
+	    (stderr,
+	     "%s: usage [in <f1> ... in <fn>] [out <fn>] [script] [json]\n"
+	     "[plugin_path <path>][default-socket][socket-name <name>]\n"
+	     "[plugin_name_filter <filter>][chroot prefix <path>]\n",
+	     argv[0]);
 	  exit (1);
 	}
     }
@@ -363,7 +385,11 @@ main (int argc, char **argv)
 
   setup_signal_handlers ();
 
-  if (connect_to_vpe ("vpp_api_test") < 0)
+  if (vam->socket_name && vat_socket_connect (vam))
+    fformat (stderr, "WARNING: socket connection failed");
+
+  if (vam->socket_client_main.socket_fd == 0
+      && connect_to_vpe ("vpp_api_test") < 0)
     {
       svm_region_exit ();
       fformat (stderr, "Couldn't connect to vpe, exiting...\n");
@@ -373,9 +399,7 @@ main (int argc, char **argv)
   vam->json_output = json_output;
 
   if (!json_output)
-    {
-      api_sw_interface_dump (vam);
-    }
+    api_sw_interface_dump (vam);
 
   vec_validate (vam->inbuf, 4096);