Add VPP Communications Library (VCL)

- VCL library
- client/server test application
- test script (make test integration tbd)
- gdb command file templates
- vppcom test config file

Change-Id: I21eab7aa09b4e5dc3412acf5c2eab07415c2fc0f
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>

9 files changed, 4795 insertions, 1 deletions

diff --git a/src/uri.am b/src/uri.am
index fb7570ff..ae6feb6f 100644
--- a/src/uri.am
+++ b/src/uri.am
@@ -11,7 +11,34 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-noinst_PROGRAMS += uri_udp_test uri_tcp_test uri_socket_test uri_socket_server
+lib_LTLIBRARIES += libvppcom.la
+
+libvppcom_la_SOURCES =
+libvppcom_la_DEPENDENCIES = 	\
+	libvppinfra.la		\
+	libvlib.la		\
+	libsvmdb.la		\
+	libsvm.la 		\
+	libvlibmemory.la 	\
+	libvlibmemoryclient.la
+
+libvppcom_la_LIBADD = $(libvppcom_la_DEPENDENCIES) -lpthread
+
+libvppcom_la_SOURCES +=				\
+  uri/vppcom.c
+
+nobase_include_HEADERS +=			\
+  uri/vppcom.h
+
+noinst_PROGRAMS +=				\
+	uri_udp_test				\
+	uri_tcp_test				\
+	uri_socket_test				\
+	uri_socket_server			\
+	vcl_test_server				\
+	vcl_test_client				\
+	sock_test_server			\
+	sock_test_client
 
 uri_udp_test_SOURCES = uri/uri_udp_test.c
 uri_udp_test_LDADD = libvlibmemoryclient.la libsvm.la \
@@ -26,3 +53,15 @@ uri_socket_test_LDADD = libvppinfra.la -lpthread -lm -lrt
 
 uri_socket_server_SOURCES = uri/uri_socket_server.c
 uri_socket_server_LDADD = libvppinfra.la -lpthread -lm -lrt
+
+vcl_test_server_SOURCES = uri/vcl_test_server.c
+vcl_test_server_LDADD = libvppcom.la
+
+vcl_test_client_SOURCES = uri/vcl_test_client.c
+vcl_test_client_LDADD = libvppcom.la 
+
+sock_test_server_SOURCES = uri/sock_test_server.c
+sock_test_client_SOURCES = uri/sock_test_client.c
+
+nobase_include_HEADERS +=			\
+  uri/sock_test.h
diff --git a/src/uri/sock_test.h b/src/uri/sock_test.h
new file mode 100644
index 00000000..281ba6fd
--- /dev/null
+++ b/src/uri/sock_test.h
@@ -0,0 +1,415 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __sock_test_h__
+#define __sock_test_h__
+
+#include <netdb.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define SOCK_TEST_TOKEN_HELP           "#H"
+#define SOCK_TEST_TOKEN_EXIT           "#X"
+#define SOCK_TEST_TOKEN_VERBOSE        "#V"
+#define SOCK_TEST_TOKEN_TXBUF_SIZE     "#T:"
+#define SOCK_TEST_TOKEN_NUM_TEST_SCKTS "#I:"
+#define SOCK_TEST_TOKEN_NUM_WRITES     "#N:"
+#define SOCK_TEST_TOKEN_RXBUF_SIZE     "#R:"
+#define SOCK_TEST_TOKEN_SHOW_CFG       "#C"
+#define SOCK_TEST_TOKEN_RUN_UNI        "#U"
+#define SOCK_TEST_TOKEN_RUN_BI         "#B"
+
+#define SOCK_TEST_BANNER_STRING \
+  "============================================\n"
+#define SOCK_TEST_SEPARATOR_STRING \
+  "  -----------------------------\n"
+
+#define ONE_GIG                       (1024*1024*1024)
+#define SOCK_TEST_SERVER_PORT         22000
+#define SOCK_TEST_LOCALHOST_IPADDR    "127.0.0.1"
+
+#define SOCK_TEST_CFG_CTRL_MAGIC      0xfeedface
+#define SOCK_TEST_CFG_NUM_WRITES_DEF  1000000
+#define SOCK_TEST_CFG_TXBUF_SIZE_DEF  8192
+#define SOCK_TEST_CFG_RXBUF_SIZE_DEF  (64*SOCK_TEST_CFG_TXBUF_SIZE_DEF)
+#define SOCK_TEST_CFG_BUF_SIZE_MIN    128
+#define SOCK_TEST_CFG_MAX_TEST_SCKTS  5
+
+typedef enum
+{
+  SOCK_TEST_TYPE_NONE,
+  SOCK_TEST_TYPE_ECHO,
+  SOCK_TEST_TYPE_UNI,
+  SOCK_TEST_TYPE_BI,
+  SOCK_TEST_TYPE_EXIT,
+} sock_test_t;
+
+typedef struct  __attribute__ ((packed))
+{
+  uint32_t magic;
+  uint32_t test;
+  uint32_t ctrl_handle;
+  uint32_t num_test_sockets;
+  uint32_t verbose;
+  uint64_t rxbuf_size;
+  uint64_t txbuf_size;
+  uint64_t num_writes;
+  uint64_t total_bytes;
+} sock_test_cfg_t;
+
+typedef struct
+{
+  uint64_t rx_xacts;
+  uint64_t rx_bytes;
+  uint32_t rx_eagain;
+  uint32_t rx_incomp;
+  uint64_t tx_xacts;
+  uint64_t tx_bytes;
+  uint32_t tx_eagain;
+  uint32_t tx_incomp;
+  struct timespec start;
+  struct timespec stop;
+} sock_test_stats_t;
+
+typedef struct
+{
+  int fd;
+  uint32_t txbuf_size;
+  char *txbuf;
+  uint32_t rxbuf_size;
+  char *rxbuf;
+  sock_test_cfg_t cfg;
+  sock_test_stats_t stats;
+} sock_test_socket_t;
+
+static inline void
+sock_test_stats_accumulate (sock_test_stats_t * accum,
+                            sock_test_stats_t * incr)
+{
+  accum->rx_xacts += incr->rx_xacts;
+  accum->rx_bytes += incr->rx_bytes;
+  accum->rx_eagain += incr->rx_eagain;
+  accum->rx_incomp += incr->rx_incomp;
+  accum->tx_xacts += incr->tx_xacts;
+  accum->tx_bytes += incr->tx_bytes;
+  accum->tx_eagain += incr->tx_eagain;
+  accum->tx_incomp += incr->tx_incomp;
+}
+
+static inline void
+sock_test_cfg_init (sock_test_cfg_t *cfg)
+{
+  cfg->magic = SOCK_TEST_CFG_CTRL_MAGIC;
+  cfg->test = SOCK_TEST_TYPE_NONE;
+  cfg->ctrl_handle = ~0;
+  cfg->num_test_sockets = 1;
+  cfg->verbose = 0;
+  cfg->rxbuf_size = SOCK_TEST_CFG_RXBUF_SIZE_DEF;
+  cfg->num_writes = SOCK_TEST_CFG_NUM_WRITES_DEF;
+  cfg->txbuf_size = SOCK_TEST_CFG_TXBUF_SIZE_DEF;
+  cfg->total_bytes = cfg->num_writes * cfg->txbuf_size;
+}
+
+static inline int
+sock_test_cfg_verify (sock_test_cfg_t *cfg, sock_test_cfg_t *valid_cfg)
+{
+  /* Note: txbuf & rxbuf on server are the same buffer,
+   *       so txbuf_size is not included in this check.
+   */
+  return ((cfg->magic == valid_cfg->magic)
+          && (cfg->test == valid_cfg->test)
+          && (cfg->verbose == valid_cfg->verbose)
+          && (cfg->rxbuf_size == valid_cfg->rxbuf_size)
+          && (cfg->num_writes == valid_cfg->num_writes)
+          && (cfg->total_bytes == valid_cfg->total_bytes));
+}
+
+static inline void
+sock_test_buf_alloc (sock_test_cfg_t *cfg, uint8_t is_rxbuf, uint8_t **buf,
+                     uint32_t *bufsize)
+{
+  uint32_t alloc_size = is_rxbuf ? cfg->rxbuf_size : cfg->txbuf_size;
+  uint8_t *lb = realloc (*buf, (size_t) alloc_size);
+
+  if (lb)
+    {
+      if (is_rxbuf)
+        cfg->rxbuf_size = *bufsize = alloc_size;
+      else
+        cfg->txbuf_size = *bufsize = alloc_size;
+      
+      *buf = lb;
+    }
+  else
+    {
+      int errno_val = errno;
+      perror ("ERROR in sock_test_buf_alloc()");
+      fprintf (stderr, "ERROR: Buffer allocation failed (errno = %d)!\n"
+               "       Using buffer size %d instead of desired"
+               " size (%d)\n", errno_val, *bufsize, alloc_size);
+    }
+}
+
+static inline void
+sock_test_socket_buf_alloc (sock_test_socket_t *socket)
+{
+  socket->rxbuf_size = socket->cfg.rxbuf_size;
+  socket->txbuf_size = socket->cfg.txbuf_size;
+  sock_test_buf_alloc (&socket->cfg, 0 /* is_rxbuf */ ,
+		       (uint8_t **) &socket->txbuf, &socket->txbuf_size);
+  sock_test_buf_alloc (&socket->cfg, 1 /* is_rxbuf */ ,
+		       (uint8_t **) &socket->rxbuf, &socket->rxbuf_size);
+}
+
+static inline char *
+sock_test_type_str (sock_test_t t)
+{
+  switch (t)
+    {
+    case SOCK_TEST_TYPE_NONE:
+      return "NONE";
+
+    case SOCK_TEST_TYPE_ECHO:
+      return "ECHO";
+
+    case SOCK_TEST_TYPE_UNI:
+      return "UNI";
+
+    case SOCK_TEST_TYPE_BI:
+      return "BI";
+
+    case SOCK_TEST_TYPE_EXIT:
+      return "EXIT";
+
+    default:
+      return "Unknown";
+    }
+}
+
+static inline void
+sock_test_cfg_dump (sock_test_cfg_t * cfg, uint8_t is_client)
+{
+  char *spc = "     ";
+  
+  printf ("  test config (%p):\n"
+          SOCK_TEST_SEPARATOR_STRING
+	  "                 magic:  0x%08x\n"
+	  "%-5s             test:  %s (%d)\n"
+	  "           ctrl handle:  %d (0x%x)\n"
+	  "%-5s num test sockets:  %u (0x%08x)\n"
+	  "%-5s          verbose:  %s (%d)\n"
+	  "%-5s       rxbuf size:  %lu (0x%08lx)\n"
+	  "%-5s       txbuf size:  %lu (0x%08lx)\n"
+	  "%-5s       num writes:  %lu (0x%08lx)\n"
+	  "       client tx bytes:  %lu (0x%08lx)\n"
+          SOCK_TEST_SEPARATOR_STRING,
+	  (void *) cfg, cfg->magic,
+          is_client && (cfg->test == SOCK_TEST_TYPE_UNI) ?
+          "'"SOCK_TEST_TOKEN_RUN_UNI"'" :
+          is_client && (cfg->test == SOCK_TEST_TYPE_BI) ?
+           "'"SOCK_TEST_TOKEN_RUN_BI"'" : spc,
+          sock_test_type_str (cfg->test), cfg->test,
+          cfg->ctrl_handle, cfg->ctrl_handle,
+          is_client ? "'"SOCK_TEST_TOKEN_NUM_TEST_SCKTS"'" : spc,
+          cfg->num_test_sockets, cfg->num_test_sockets,
+          is_client ? "'"SOCK_TEST_TOKEN_VERBOSE"'" : spc,
+          cfg->verbose ? "on" : "off", cfg->verbose,
+          is_client ? "'"SOCK_TEST_TOKEN_RXBUF_SIZE"'" : spc,
+          cfg->rxbuf_size, cfg->rxbuf_size,
+          is_client ? "'"SOCK_TEST_TOKEN_TXBUF_SIZE"'" : spc,
+          cfg->txbuf_size, cfg->txbuf_size,
+          is_client ? "'"SOCK_TEST_TOKEN_NUM_WRITES"'" : spc,
+          cfg->num_writes, cfg->num_writes,
+          cfg->total_bytes, cfg->total_bytes);
+}
+
+static inline void
+sock_test_stats_dump (char * header, sock_test_stats_t * stats,
+                      uint8_t show_rx, uint8_t show_tx,
+                      uint8_t verbose)
+{
+  struct timespec diff;
+  double duration, rate;
+  uint64_t total_bytes;
+  
+  if ((stats->stop.tv_nsec - stats->start.tv_nsec) < 0)
+    {
+      diff.tv_sec = stats->stop.tv_sec - stats->start.tv_sec - 1;
+      diff.tv_nsec = stats->stop.tv_nsec - stats->start.tv_nsec + 1000000000;
+    }
+  else
+    {
+      diff.tv_sec = stats->stop.tv_sec - stats->start.tv_sec;
+      diff.tv_nsec = stats->stop.tv_nsec - stats->start.tv_nsec;
+    }
+  duration = (double) diff.tv_sec + (1e-9 * diff.tv_nsec);
+
+  total_bytes = stats->tx_bytes + stats->rx_bytes;
+  rate = (double) total_bytes * 8 / duration / ONE_GIG;
+  printf ("\n%s: Streamed %lu bytes\n"
+          "  in %lf seconds (%lf Gbps %s-duplex)!\n",
+              header, total_bytes, duration, rate,
+          (show_rx && show_tx) ? "full" : "half");
+
+  if (show_tx)
+    {
+      printf (SOCK_TEST_SEPARATOR_STRING
+              "  tx stats (0x%p):\n"
+              SOCK_TEST_SEPARATOR_STRING
+              "         writes:  %lu (0x%08lx)\n"
+              "       tx bytes:  %lu (0x%08lx)\n"
+              "      tx eagain:  %u (0x%08x)\n"
+              "  tx incomplete:  %u (0x%08x)\n",
+              (void *)stats, stats->tx_xacts, stats->tx_xacts,
+              stats->tx_bytes, stats->tx_bytes,
+              stats->tx_eagain, stats->tx_eagain,
+              stats->tx_incomp, stats->tx_incomp);
+    }
+  if (show_rx)
+    {
+      printf (SOCK_TEST_SEPARATOR_STRING
+              "  rx stats (0x%p):\n"
+              SOCK_TEST_SEPARATOR_STRING
+              "          reads:  %lu (0x%08lx)\n"
+              "       rx bytes:  %lu (0x%08lx)\n"
+              "      rx eagain:  %u (0x%08x)\n"
+              "  rx incomplete:  %u (0x%08x)\n",
+              (void *)stats, stats->rx_xacts, stats->rx_xacts,
+              stats->rx_bytes, stats->rx_bytes,
+              stats->rx_eagain, stats->rx_eagain,
+              stats->rx_incomp, stats->rx_incomp);
+    }
+  if (verbose)
+    printf ("   start.tv_sec:  %ld\n"
+            "  start.tv_nsec:  %ld\n"
+            "    stop.tv_sec:  %ld\n"
+            "   stop.tv_nsec:  %ld\n",
+            stats->start.tv_sec, stats->start.tv_nsec,
+            stats->stop.tv_sec, stats->stop.tv_nsec);
+            
+  printf (SOCK_TEST_SEPARATOR_STRING);
+}
+
+static inline int
+sock_test_read (int fd, uint8_t *buf, uint32_t nbytes,
+                sock_test_stats_t *stats)
+{
+  int rx_bytes, errno_val;
+  
+  do
+    {
+      if (stats)
+        stats->rx_xacts++;
+#ifdef VCL_TEST
+      rx_bytes = vppcom_session_read (fd, buf, nbytes);
+
+      if (rx_bytes < 0)
+        {
+          errno = -rx_bytes;
+          rx_bytes = -1;
+        }
+#else
+      rx_bytes = read (fd, buf, nbytes);
+#endif
+      if (stats)
+        {
+          if ((rx_bytes == 0) ||
+              ((rx_bytes < 0) && ((errno == EAGAIN) || (errno == EWOULDBLOCK))))
+            stats->rx_eagain++;
+          else if (rx_bytes < nbytes)
+            stats->rx_incomp++;
+        }
+    }
+  while ((rx_bytes == 0) ||
+         ((rx_bytes < 0) && ((errno == EAGAIN) || (errno == EWOULDBLOCK))));
+  
+  if (rx_bytes < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in sock_test_read()");
+      fprintf (stderr, "ERROR: socket read failed (errno = %d)!\n",
+               errno_val);
+      errno = errno_val;
+    }
+  else if (stats)
+    stats->rx_bytes += rx_bytes;
+
+  return (rx_bytes);
+}
+
+static inline int
+sock_test_write (int fd, uint8_t *buf, uint32_t nbytes,
+                 sock_test_stats_t *stats, uint32_t verbose)
+{
+  int tx_bytes = 0;
+  int nbytes_left = nbytes;
+  int rv, errno_val;
+
+  do
+    {
+      if (stats)
+        stats->tx_xacts++;
+#ifdef VCL_TEST
+      rv = vppcom_session_write (fd, buf, nbytes_left);
+      if (rv < 0)
+        {
+          errno = -rv;
+          rv = -1;
+        }
+#else
+      rv = write (fd, buf, nbytes_left);
+#endif
+      if (rv < 0)
+        {
+          if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
+            {
+              if (stats)
+                stats->tx_eagain++;
+              continue;
+            }
+          else
+            break;
+        }
+      tx_bytes += rv;
+     
+      if (tx_bytes != nbytes)
+        {
+          nbytes_left = nbytes_left - rv;
+          if (stats)
+            stats->tx_incomp++;
+          if (verbose)
+            {
+              printf ("WARNING: bytes written (%d) != bytes to write (%d)!\n",
+                      tx_bytes, nbytes);
+            }
+        }
+     
+    } while (tx_bytes != nbytes);
+
+  if (tx_bytes < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in sock_test_write()");
+      fprintf (stderr, "ERROR: socket write failed (errno = %d)!\n",
+               errno_val);
+    }
+  else if (stats)
+    stats->tx_bytes += tx_bytes;
+  
+  return (tx_bytes);
+}
+
+#endif /* __sock_test_h__ */
diff --git a/src/uri/sock_test_client.c b/src/uri/sock_test_client.c
new file mode 100644
index 00000000..26d096be
--- /dev/null
+++ b/src/uri/sock_test_client.c
@@ -0,0 +1,1070 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <time.h>
+#include <arpa/inet.h>
+#include <uri/sock_test.h>
+
+typedef struct
+{
+#ifdef VCL_TEST
+  vppcom_endpt_t server_endpt;
+#endif
+  struct sockaddr_in server_addr;
+  sock_test_socket_t ctrl_socket;
+  sock_test_socket_t *test_socket;
+  uint32_t num_test_sockets;
+  uint8_t dump_cfg;
+} sock_client_main_t;
+
+sock_client_main_t sock_client_main;
+
+
+static int
+sock_test_cfg_sync (sock_test_socket_t * socket)
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  sock_test_cfg_t *rl_cfg = (sock_test_cfg_t *) socket->rxbuf;
+  int rx_bytes, tx_bytes;
+
+  if (socket->cfg.verbose)
+    sock_test_cfg_dump (&socket->cfg, 1 /* is_client */ );
+
+  tx_bytes = sock_test_write (socket->fd, (uint8_t *) & ctrl->cfg,
+			      sizeof (ctrl->cfg), NULL, ctrl->cfg.verbose);
+  if (tx_bytes < 0)
+    {
+      fprintf (stderr, "ERROR: write test cfg failed (%d)!\n", tx_bytes);
+      return tx_bytes;
+    }
+
+  rx_bytes = sock_test_read (socket->fd, (uint8_t *) socket->rxbuf,
+			     sizeof (sock_test_cfg_t), NULL);
+  if (rx_bytes < 0)
+    return rx_bytes;
+
+  if (rl_cfg->magic != SOCK_TEST_CFG_CTRL_MAGIC)
+    {
+      fprintf (stderr, "ERROR: Bad server reply cfg -- aborting!\n");
+      return -1;
+    }
+  if (socket->cfg.verbose)
+    {
+      printf ("CLIENT (fd %d): Got config back from server.\n", socket->fd);
+      sock_test_cfg_dump (rl_cfg, 1 /* is_client */ );
+    }
+  if ((rx_bytes != sizeof (sock_test_cfg_t))
+      || !sock_test_cfg_verify (rl_cfg, &ctrl->cfg))
+    {
+      fprintf (stderr,
+	       "ERROR: Invalid config received from server -- aborting!\n");
+      sock_test_cfg_dump (rl_cfg, 1 /* is_client */ );
+      return -1;
+    }
+  ctrl->cfg.ctrl_handle = ((ctrl->cfg.ctrl_handle == ~0) ?
+			   rl_cfg->ctrl_handle : ctrl->cfg.ctrl_handle);
+
+  return 0;
+}
+
+static void
+echo_test_client ()
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  sock_test_socket_t *tsock;
+  int rx_bytes, tx_bytes, nbytes;
+  uint32_t i, n;
+  int rv;
+  int nfds = 0;
+  fd_set wr_fdset, rd_fdset;
+  fd_set _wfdset, *wfdset = &_wfdset;
+  fd_set _rfdset, *rfdset = &_rfdset;
+
+  FD_ZERO (&wr_fdset);
+  FD_ZERO (&rd_fdset);
+  memset (&ctrl->stats, 0, sizeof (ctrl->stats));
+  ctrl->cfg.total_bytes = nbytes = strlen (ctrl->txbuf) + 1;
+  for (n = 0; n != ctrl->cfg.num_test_sockets; n++)
+    {
+      tsock = &scm->test_socket[n];
+      tsock->cfg = ctrl->cfg;
+      sock_test_socket_buf_alloc (tsock);
+      sock_test_cfg_sync (tsock);
+
+      memcpy (tsock->txbuf, ctrl->txbuf, nbytes);
+      memset (&tsock->stats, 0, sizeof (tsock->stats));
+
+      FD_SET (tsock->fd, &wr_fdset);
+      FD_SET (tsock->fd, &rd_fdset);
+      nfds = ((tsock->fd + 1) > nfds) ? (tsock->fd + 1) : nfds;
+    }
+
+  nfds++;
+  clock_gettime (CLOCK_REALTIME, &ctrl->stats.start);
+  while (n)
+    {
+      _wfdset = wr_fdset;
+      _rfdset = rd_fdset;
+
+#ifdef VCL_TEST
+      rv = vppcom_select (nfds, (uint64_t *) rfdset, (uint64_t *) wfdset,
+			  NULL, 0);
+#else
+      {
+	struct timeval timeout;
+	timeout.tv_sec = 0;
+	timeout.tv_usec = 0;
+	rv = select (nfds, rfdset, wfdset, NULL, &timeout);
+      }
+#endif
+      if (rv < 0)
+	{
+	  perror ("select()");
+	  fprintf (stderr, "\nERROR: select() failed -- aborting test!\n");
+	  return;
+	}
+      else if (rv == 0)
+	continue;
+
+      for (i = 0; i < ctrl->cfg.num_test_sockets; i++)
+	{
+	  tsock = &scm->test_socket[i];
+	  if (!((tsock->stats.stop.tv_sec == 0) &&
+		(tsock->stats.stop.tv_nsec == 0)))
+	    continue;
+
+	  if (FD_ISSET (tsock->fd, wfdset) &&
+	      (tsock->stats.tx_bytes < ctrl->cfg.total_bytes))
+
+	    {
+	      tx_bytes =
+		sock_test_write (tsock->fd, (uint8_t *) tsock->txbuf, nbytes,
+				 &tsock->stats, ctrl->cfg.verbose);
+	      if (tx_bytes < 0)
+		{
+		  fprintf (stderr, "\nERROR: sock_test_write(%d) failed "
+			   "-- aborting test!\n", tsock->fd);
+		  return;
+		}
+
+	      printf ("CLIENT (fd %d): TX (%d bytes) - '%s'\n",
+		      tsock->fd, tx_bytes, tsock->txbuf);
+	    }
+
+	  if ((FD_ISSET (tsock->fd, rfdset)) &&
+	      (tsock->stats.rx_bytes < ctrl->cfg.total_bytes))
+	    {
+	      rx_bytes =
+		sock_test_read (tsock->fd, (uint8_t *) tsock->rxbuf,
+				nbytes, &tsock->stats);
+	      if (rx_bytes > 0)
+		{
+		  printf ("CLIENT (fd %d): RX (%d bytes) - '%s'\n",
+			  tsock->fd, rx_bytes, tsock->rxbuf);
+
+		  if (tsock->stats.rx_bytes != tsock->stats.tx_bytes)
+		    printf
+		      ("WARNING: bytes read (%lu) != bytes written (%lu)!\n",
+		       tsock->stats.rx_bytes, tsock->stats.tx_bytes);
+		}
+	    }
+
+	  if (tsock->stats.rx_bytes >= ctrl->cfg.total_bytes)
+	    {
+	      clock_gettime (CLOCK_REALTIME, &tsock->stats.stop);
+	      n--;
+	    }
+	}
+    }
+  clock_gettime (CLOCK_REALTIME, &ctrl->stats.stop);
+
+  for (i = 0; i < ctrl->cfg.num_test_sockets; i++)
+    {
+      tsock = &scm->test_socket[i];
+      tsock->stats.start = ctrl->stats.start;
+
+      if (ctrl->cfg.verbose)
+	{
+	  static char buf[64];
+
+	  sprintf (buf, "CLIENT (fd %d) RESULTS", tsock->fd);
+	  sock_test_stats_dump (buf, &tsock->stats,
+				1 /* show_rx */ , 1 /* show tx */ ,
+				ctrl->cfg.verbose);
+	}
+
+      sock_test_stats_accumulate (&ctrl->stats, &tsock->stats);
+    }
+
+  if (ctrl->cfg.verbose)
+    {
+      sock_test_stats_dump ("CLIENT RESULTS", &ctrl->stats,
+			    1 /* show_rx */ , 1 /* show tx */ ,
+			    ctrl->cfg.verbose);
+      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+
+      if (ctrl->cfg.verbose > 1)
+	{
+	  printf ("  ctrl socket info\n"
+		  SOCK_TEST_SEPARATOR_STRING
+		  "          fd:  %d (0x%08x)\n"
+		  "       rxbuf:  %p\n"
+		  "  rxbuf size:  %u (0x%08x)\n"
+		  "       txbuf:  %p\n"
+		  "  txbuf size:  %u (0x%08x)\n"
+		  SOCK_TEST_SEPARATOR_STRING,
+		  ctrl->fd, (uint32_t) ctrl->fd,
+		  ctrl->rxbuf, ctrl->rxbuf_size, ctrl->rxbuf_size,
+		  ctrl->txbuf, ctrl->txbuf_size, ctrl->txbuf_size);
+	}
+    }
+}
+
+static void
+stream_test_client (sock_test_t test)
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  sock_test_socket_t *tsock;
+  int tx_bytes;
+  uint32_t i, n;
+  int rv;
+  int nfds = 0;
+  fd_set wr_fdset, rd_fdset;
+  fd_set _wfdset, *wfdset = &_wfdset;
+  fd_set _rfdset, *rfdset = (test == SOCK_TEST_TYPE_BI) ? &_rfdset : 0;
+
+  ctrl->cfg.total_bytes = ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
+  ctrl->cfg.ctrl_handle = ~0;
+
+  printf ("\n" SOCK_TEST_BANNER_STRING
+	  "CLIENT (fd %d): %s-directional Stream Test!\n\n"
+	  "CLIENT (fd %d): Sending config to server on ctrl socket...\n",
+	  ctrl->fd, test == SOCK_TEST_TYPE_BI ? "Bi" : "Uni", ctrl->fd);
+
+  if (sock_test_cfg_sync (ctrl))
+    {
+      fprintf (stderr, "ERROR: test cfg sync failed -- aborting!");
+      return;
+    }
+
+  FD_ZERO (&wr_fdset);
+  FD_ZERO (&rd_fdset);
+  memset (&ctrl->stats, 0, sizeof (ctrl->stats));
+  for (n = 0; n != ctrl->cfg.num_test_sockets; n++)
+    {
+      tsock = &scm->test_socket[n];
+      tsock->cfg = ctrl->cfg;
+      sock_test_socket_buf_alloc (tsock);
+      printf ("CLIENT (fd %d): Sending config to server on "
+	      "test socket %d...\n", tsock->fd, n);
+      sock_test_cfg_sync (tsock);
+
+      /* Fill payload with incrementing uint32's */
+      for (i = 0; i < tsock->txbuf_size; i++)
+	tsock->txbuf[i] = i & 0xff;
+
+      memset (&tsock->stats, 0, sizeof (tsock->stats));
+      FD_SET (tsock->fd, &wr_fdset);
+      FD_SET (tsock->fd, &rd_fdset);
+      nfds = ((tsock->fd + 1) > nfds) ? (tsock->fd + 1) : nfds;
+    }
+
+  nfds++;
+  clock_gettime (CLOCK_REALTIME, &ctrl->stats.start);
+  while (n)
+    {
+      _wfdset = wr_fdset;
+      _rfdset = rd_fdset;
+
+#ifdef VCL_TEST
+      rv = vppcom_select (nfds, (uint64_t *) rfdset, (uint64_t *) wfdset,
+			  NULL, 0);
+#else
+      {
+	struct timeval timeout;
+	timeout.tv_sec = 0;
+	timeout.tv_usec = 0;
+	rv = select (nfds, rfdset, wfdset, NULL, &timeout);
+      }
+#endif
+      if (rv < 0)
+	{
+	  perror ("select()");
+	  fprintf (stderr, "\nERROR: select() failed -- aborting test!\n");
+	  return;
+	}
+      else if (rv == 0)
+	continue;
+
+      for (i = 0; i < ctrl->cfg.num_test_sockets; i++)
+	{
+	  tsock = &scm->test_socket[i];
+	  if (!((tsock->stats.stop.tv_sec == 0) &&
+		(tsock->stats.stop.tv_nsec == 0)))
+	    continue;
+
+	  if (FD_ISSET (tsock->fd, wfdset) &&
+	      (tsock->stats.tx_bytes < ctrl->cfg.total_bytes))
+	    {
+	      tx_bytes =
+		sock_test_write (tsock->fd, (uint8_t *) tsock->txbuf,
+				 ctrl->cfg.txbuf_size, &tsock->stats,
+				 ctrl->cfg.verbose);
+	      if (tx_bytes < 0)
+		{
+		  fprintf (stderr, "\nERROR: sock_test_write(%d) failed "
+			   "-- aborting test!\n", tsock->fd);
+		  return;
+		}
+	    }
+
+	  if ((test == SOCK_TEST_TYPE_BI) &&
+	      FD_ISSET (tsock->fd, rfdset) &&
+	      (tsock->stats.rx_bytes < ctrl->cfg.total_bytes))
+	    {
+	      (void) sock_test_read (tsock->fd,
+				     (uint8_t *) tsock->rxbuf,
+				     tsock->rxbuf_size, &tsock->stats);
+	    }
+
+	  if (((test == SOCK_TEST_TYPE_UNI) &&
+	       (tsock->stats.tx_bytes >= ctrl->cfg.total_bytes)) ||
+	      ((test == SOCK_TEST_TYPE_BI) &&
+	       (tsock->stats.rx_bytes >= ctrl->cfg.total_bytes)))
+	    {
+	      clock_gettime (CLOCK_REALTIME, &tsock->stats.stop);
+	      n--;
+	    }
+	}
+    }
+  clock_gettime (CLOCK_REALTIME, &ctrl->stats.stop);
+
+  printf ("CLIENT (fd %d): Sending config to server on ctrl socket...\n",
+	  ctrl->fd);
+
+  if (sock_test_cfg_sync (ctrl))
+    {
+      fprintf (stderr, "ERROR: test cfg sync failed -- aborting!");
+      return;
+    }
+
+  for (i = 0; i < ctrl->cfg.num_test_sockets; i++)
+    {
+      tsock = &scm->test_socket[i];
+
+      if (ctrl->cfg.verbose)
+	{
+	  static char buf[64];
+
+	  sprintf (buf, "CLIENT (fd %d) RESULTS", tsock->fd);
+	  sock_test_stats_dump (buf, &tsock->stats,
+				test == SOCK_TEST_TYPE_BI /* show_rx */ ,
+				1 /* show tx */ , ctrl->cfg.verbose);
+	}
+
+      sock_test_stats_accumulate (&ctrl->stats, &tsock->stats);
+    }
+
+  sock_test_stats_dump ("CLIENT RESULTS", &ctrl->stats,
+			test == SOCK_TEST_TYPE_BI /* show_rx */ ,
+			1 /* show tx */ , ctrl->cfg.verbose);
+  sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+
+  if (ctrl->cfg.verbose)
+    {
+      printf ("  ctrl socket info\n"
+	      SOCK_TEST_SEPARATOR_STRING
+	      "          fd:  %d (0x%08x)\n"
+	      "       rxbuf:  %p\n"
+	      "  rxbuf size:  %u (0x%08x)\n"
+	      "       txbuf:  %p\n"
+	      "  txbuf size:  %u (0x%08x)\n"
+	      SOCK_TEST_SEPARATOR_STRING,
+	      ctrl->fd, (uint32_t) ctrl->fd,
+	      ctrl->rxbuf, ctrl->rxbuf_size, ctrl->rxbuf_size,
+	      ctrl->txbuf, ctrl->txbuf_size, ctrl->txbuf_size);
+    }
+
+  ctrl->cfg.test = SOCK_TEST_TYPE_ECHO;
+  if (sock_test_cfg_sync (ctrl))
+    fprintf (stderr, "ERROR: post-test cfg sync failed!");
+
+  printf ("CLIENT (fd %d): %s-directional Stream Test Complete!\n"
+	  SOCK_TEST_BANNER_STRING "\n", ctrl->fd,
+	  test == SOCK_TEST_TYPE_BI ? "Bi" : "Uni");
+}
+
+static void
+exit_client (void)
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  sock_test_socket_t *tsock;
+  int i;
+
+  for (i = 0; i < ctrl->cfg.num_test_sockets; i++)
+    {
+      tsock = &scm->test_socket[i];
+      tsock->cfg.test = SOCK_TEST_TYPE_EXIT;
+
+      if (ctrl->cfg.verbose)
+	{
+	  printf ("\nCLIENT (fd %d): Sending exit cfg to server...\n",
+		  tsock->fd);
+	  sock_test_cfg_dump (&tsock->cfg, 1 /* is_client */ );
+	}
+      (void) sock_test_write (tsock->fd, (uint8_t *) & tsock->cfg,
+			      sizeof (tsock->cfg), &tsock->stats,
+			      ctrl->cfg.verbose);
+    }
+
+  ctrl->cfg.test = SOCK_TEST_TYPE_EXIT;
+  if (ctrl->cfg.verbose)
+    {
+      printf ("\nCLIENT (fd %d): Sending exit cfg to server...\n", ctrl->fd);
+      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+    }
+  (void) sock_test_write (ctrl->fd, (uint8_t *) & ctrl->cfg,
+			  sizeof (ctrl->cfg), &ctrl->stats,
+			  ctrl->cfg.verbose);
+  printf ("\nCLIENT: So long and thanks for all the fish!\n\n");
+  sleep (1);
+}
+
+static int
+sock_test_connect_test_sockets (uint32_t num_test_sockets)
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  sock_test_socket_t *tsock;
+  int i, rv, errno_val;
+
+  if (num_test_sockets < 1)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  if (num_test_sockets < scm->num_test_sockets)
+    {
+      for (i = scm->num_test_sockets - 1; i >= num_test_sockets; i--)
+	{
+	  tsock = &scm->test_socket[i];
+#ifdef VCL_TEST
+	  vppcom_session_close (tsock->fd);
+#else
+	  close (tsock->fd);
+#endif
+	  free (tsock->txbuf);
+	  free (tsock->rxbuf);
+	}
+    }
+
+  else if (num_test_sockets > scm->num_test_sockets)
+    {
+      tsock = realloc (scm->test_socket,
+		       sizeof (sock_test_socket_t) * num_test_sockets);
+      if (!tsock)
+	{
+	  errno_val = errno;
+	  perror ("ERROR in sock_test_connect_test_sockets()");
+	  fprintf (stderr, "ERROR: socket failed (errno = %d)!\n", errno_val);
+	  return -1;
+	}
+
+      scm->test_socket = tsock;
+      for (i = scm->num_test_sockets; i < num_test_sockets; i++)
+	{
+	  tsock = &scm->test_socket[i];
+#ifdef VCL_TEST
+	  tsock->fd =
+	    vppcom_session_create (VPPCOM_VRF_DEFAULT, VPPCOM_PROTO_TCP,
+				   0 /* is_nonblocking */ );
+	  if (tsock->fd < 0)
+	    {
+	      errno = -tsock->fd;
+	      tsock->fd = -1;
+	    }
+#else
+	  tsock->fd = socket (AF_INET, SOCK_STREAM, 0);
+#endif
+	  if (tsock->fd < 0)
+	    {
+	      errno_val = errno;
+	      perror ("ERROR in sock_test_connect_test_sockets()");
+	      fprintf (stderr, "ERROR: socket failed (errno = %d)!\n",
+		       errno_val);
+	      return tsock->fd;
+	    }
+
+#ifdef VCL_TEST
+	  rv = vppcom_session_connect (tsock->fd, &scm->server_endpt);
+#else
+	  rv =
+	    connect (tsock->fd, (struct sockaddr *) &scm->server_addr,
+		     sizeof (scm->server_addr));
+#endif
+	  if (rv < 0)
+	    {
+	      errno_val = errno;
+	      perror ("ERROR in main()");
+	      fprintf (stderr, "ERROR: connect failed (errno = %d)!\n",
+		       errno_val);
+	    }
+	  tsock->cfg = ctrl->cfg;
+	  sock_test_socket_buf_alloc (tsock);
+	  sock_test_cfg_sync (tsock);
+
+	  printf ("CLIENT (fd %d): Test socket %d connected.\n",
+		  tsock->fd, i);
+	}
+    }
+
+  scm->num_test_sockets = num_test_sockets;
+  printf ("CLIENT: All sockets (%d) connected!\n", scm->num_test_sockets + 1);
+  return 0;
+}
+
+static void
+dump_help (void)
+{
+#define INDENT "\n  "
+
+  printf ("Test configuration commands:"
+	  INDENT SOCK_TEST_TOKEN_HELP
+	  "\t\t\tDisplay help."
+	  INDENT SOCK_TEST_TOKEN_EXIT
+	  "\t\t\tExit test client & server."
+	  INDENT SOCK_TEST_TOKEN_SHOW_CFG
+	  "\t\t\tShow the current test cfg."
+	  INDENT SOCK_TEST_TOKEN_RUN_UNI
+	  "\t\t\tRun the Uni-directional test."
+	  INDENT SOCK_TEST_TOKEN_RUN_BI
+	  "\t\t\tRun the Bi-directional test."
+	  INDENT SOCK_TEST_TOKEN_VERBOSE
+	  "\t\t\tToggle verbose setting."
+	  INDENT SOCK_TEST_TOKEN_RXBUF_SIZE
+	  "<rxbuf size>\tRx buffer size (bytes)."
+	  INDENT SOCK_TEST_TOKEN_TXBUF_SIZE
+	  "<txbuf size>\tTx buffer size (bytes)."
+	  INDENT SOCK_TEST_TOKEN_NUM_WRITES
+	  "<# of writes>\tNumber of txbuf writes to server." "\n");
+}
+
+static void
+cfg_txbuf_size_set (void)
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  char *p = ctrl->txbuf + strlen (SOCK_TEST_TOKEN_TXBUF_SIZE);
+  uint64_t txbuf_size = strtoull ((const char *) p, NULL, 10);
+
+  if (txbuf_size >= SOCK_TEST_CFG_BUF_SIZE_MIN)
+    {
+      ctrl->cfg.txbuf_size = txbuf_size;
+      ctrl->cfg.total_bytes = ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
+      sock_test_buf_alloc (&ctrl->cfg, 0 /* is_rxbuf */ ,
+			   (uint8_t **) & ctrl->txbuf, &ctrl->txbuf_size);
+      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+    }
+  else
+    fprintf (stderr,
+	     "ERROR: Invalid txbuf size (%lu) < minimum buf size (%u)!\n",
+	     txbuf_size, SOCK_TEST_CFG_BUF_SIZE_MIN);
+}
+
+static void
+cfg_num_writes_set (void)
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  char *p = ctrl->txbuf + strlen (SOCK_TEST_TOKEN_NUM_WRITES);
+  uint32_t num_writes = strtoul ((const char *) p, NULL, 10);
+
+  if (num_writes > 0)
+    {
+      ctrl->cfg.num_writes = num_writes;
+      ctrl->cfg.total_bytes = ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
+      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+    }
+  else
+    {
+      fprintf (stderr, "ERROR: invalid num writes: %u\n", num_writes);
+    }
+}
+
+static void
+cfg_num_test_sockets_set (void)
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  char *p = ctrl->txbuf + strlen (SOCK_TEST_TOKEN_NUM_TEST_SCKTS);
+  uint32_t num_test_sockets = strtoul ((const char *) p, NULL, 10);
+
+  if ((num_test_sockets > 0) &&
+      (num_test_sockets <= SOCK_TEST_CFG_MAX_TEST_SCKTS))
+    {
+      ctrl->cfg.num_test_sockets = num_test_sockets;
+      sock_test_connect_test_sockets (num_test_sockets);
+      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+    }
+  else
+    {
+      fprintf (stderr, "ERROR: invalid num test sockets: %u, (%d max)\n",
+	       num_test_sockets, SOCK_TEST_CFG_MAX_TEST_SCKTS);
+    }
+}
+
+static void
+cfg_rxbuf_size_set (void)
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  char *p = ctrl->txbuf + strlen (SOCK_TEST_TOKEN_RXBUF_SIZE);
+  uint64_t rxbuf_size = strtoull ((const char *) p, NULL, 10);
+
+  if (rxbuf_size >= SOCK_TEST_CFG_BUF_SIZE_MIN)
+    {
+      ctrl->cfg.rxbuf_size = rxbuf_size;
+      sock_test_buf_alloc (&ctrl->cfg, 1 /* is_rxbuf */ ,
+			   (uint8_t **) & ctrl->rxbuf, &ctrl->rxbuf_size);
+      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+    }
+  else
+    fprintf (stderr,
+	     "ERROR: Invalid rxbuf size (%lu) < minimum buf size (%u)!\n",
+	     rxbuf_size, SOCK_TEST_CFG_BUF_SIZE_MIN);
+}
+
+static void
+cfg_verbose_toggle (void)
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+
+  ctrl->cfg.verbose = ctrl->cfg.verbose ? 0 : 1;
+  sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+
+}
+
+static sock_test_t
+parse_input ()
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  sock_test_t rv = SOCK_TEST_TYPE_NONE;
+
+  if (!strcmp (SOCK_TEST_TOKEN_EXIT, ctrl->txbuf))
+    rv = SOCK_TEST_TYPE_EXIT;
+
+  else if (!strcmp (SOCK_TEST_TOKEN_HELP, ctrl->txbuf))
+    dump_help ();
+
+  else if (!strcmp (SOCK_TEST_TOKEN_SHOW_CFG, ctrl->txbuf))
+    scm->dump_cfg = 1;
+
+  else if (!strcmp (SOCK_TEST_TOKEN_VERBOSE, ctrl->txbuf))
+    cfg_verbose_toggle ();
+
+  else if (!strncmp (SOCK_TEST_TOKEN_TXBUF_SIZE, ctrl->txbuf,
+		     strlen (SOCK_TEST_TOKEN_TXBUF_SIZE)))
+    cfg_txbuf_size_set ();
+
+  else if (!strncmp (SOCK_TEST_TOKEN_NUM_TEST_SCKTS, ctrl->txbuf,
+		     strlen (SOCK_TEST_TOKEN_NUM_TEST_SCKTS)))
+    cfg_num_test_sockets_set ();
+
+  else if (!strncmp (SOCK_TEST_TOKEN_NUM_WRITES, ctrl->txbuf,
+		     strlen (SOCK_TEST_TOKEN_NUM_WRITES)))
+    cfg_num_writes_set ();
+
+  else if (!strncmp (SOCK_TEST_TOKEN_RXBUF_SIZE, ctrl->txbuf,
+		     strlen (SOCK_TEST_TOKEN_RXBUF_SIZE)))
+    cfg_rxbuf_size_set ();
+
+  else if (!strncmp (SOCK_TEST_TOKEN_RUN_UNI, ctrl->txbuf,
+		     strlen (SOCK_TEST_TOKEN_RUN_UNI)))
+    rv = ctrl->cfg.test = SOCK_TEST_TYPE_UNI;
+
+  else if (!strncmp (SOCK_TEST_TOKEN_RUN_BI, ctrl->txbuf,
+		     strlen (SOCK_TEST_TOKEN_RUN_BI)))
+    rv = ctrl->cfg.test = SOCK_TEST_TYPE_BI;
+
+  else
+    rv = SOCK_TEST_TYPE_ECHO;
+
+  return rv;
+}
+
+void
+print_usage_and_exit (void)
+{
+  fprintf (stderr,
+	   "sock_test_client [OPTIONS] <ipaddr> <port>\n"
+	   "  OPTIONS\n"
+	   "  -h               Print this message and exit.\n"
+	   "  -c               Print test config before test.\n"
+	   "  -w <dir>         Write test results to <dir>.\n"
+	   "  -X               Exit after running test.\n"
+	   "  -E               Run Echo test.\n"
+	   "  -N <num-writes>  Test Cfg: number of writes.\n"
+	   "  -R <rxbuf-size>  Test Cfg: rx buffer size.\n"
+	   "  -T <txbuf-size>  Test Cfg: tx buffer size.\n"
+	   "  -U               Run Uni-directional test.\n"
+	   "  -B               Run Bi-directional test.\n"
+	   "  -V               Verbose mode.\n");
+  exit (1);
+}
+
+int
+main (int argc, char **argv)
+{
+  sock_client_main_t *scm = &sock_client_main;
+  sock_test_socket_t *ctrl = &scm->ctrl_socket;
+  int c, rv, errno_val;
+  sock_test_t post_test = SOCK_TEST_TYPE_NONE;
+
+  sock_test_cfg_init (&ctrl->cfg);
+  sock_test_socket_buf_alloc (ctrl);
+
+  opterr = 0;
+  while ((c = getopt (argc, argv, "chn:w:XE:I:N:R:T:UBV")) != -1)
+    switch (c)
+      {
+      case 'c':
+	scm->dump_cfg = 1;
+	break;
+
+      case 's':
+	if (sscanf (optarg, "0x%x", &ctrl->cfg.num_test_sockets) != 1)
+	  if (sscanf (optarg, "%u", &ctrl->cfg.num_test_sockets) != 1)
+	    {
+	      fprintf (stderr, "ERROR: Invalid value for option -%c!\n", c);
+	      print_usage_and_exit ();
+	    }
+	if (!ctrl->cfg.num_test_sockets ||
+	    (ctrl->cfg.num_test_sockets > FD_SETSIZE))
+	  {
+	    fprintf (stderr, "ERROR: Invalid number of sockets (%d)"
+		     "specified for option -%c!\n"
+		     "       Valid range is 1 - %d\n",
+		     ctrl->cfg.num_test_sockets, c, FD_SETSIZE);
+	    print_usage_and_exit ();
+	  }
+	break;
+
+      case 'w':
+	fprintf (stderr, "Writing test results to files is TBD.\n");
+	break;
+
+      case 'X':
+	post_test = SOCK_TEST_TYPE_EXIT;
+	break;
+
+      case 'E':
+	if (strlen (optarg) > ctrl->txbuf_size)
+	  {
+	    fprintf (stderr,
+		     "ERROR: Option -%c value larger than txbuf size (%d)!\n",
+		     optopt, ctrl->txbuf_size);
+	    print_usage_and_exit ();
+	  }
+	strcpy (ctrl->txbuf, optarg);
+	ctrl->cfg.test = SOCK_TEST_TYPE_ECHO;
+	break;
+
+      case 'I':
+	if (sscanf (optarg, "0x%x", &ctrl->cfg.num_test_sockets) != 1)
+	  if (sscanf (optarg, "%d", &ctrl->cfg.num_test_sockets) != 1)
+	    {
+	      fprintf (stderr, "ERROR: Invalid value for option -%c!\n", c);
+	      print_usage_and_exit ();
+	    }
+	if (ctrl->cfg.num_test_sockets > SOCK_TEST_CFG_MAX_TEST_SCKTS)
+	  {
+	    fprintf (stderr, "ERROR: value greater than max number test"
+		     " sockets (%d)!", SOCK_TEST_CFG_MAX_TEST_SCKTS);
+	    print_usage_and_exit ();
+	  }
+	break;
+
+      case 'N':
+	if (sscanf (optarg, "0x%lx", &ctrl->cfg.num_writes) != 1)
+	  if (sscanf (optarg, "%ld", &ctrl->cfg.num_writes) != 1)
+	    {
+	      fprintf (stderr, "ERROR: Invalid value for option -%c!\n", c);
+	      print_usage_and_exit ();
+	    }
+	ctrl->cfg.total_bytes = ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
+	break;
+
+      case 'R':
+	if (sscanf (optarg, "0x%lx", &ctrl->cfg.rxbuf_size) != 1)
+	  if (sscanf (optarg, "%ld", &ctrl->cfg.rxbuf_size) != 1)
+	    {
+	      fprintf (stderr, "ERROR: Invalid value for option -%c!\n", c);
+	      print_usage_and_exit ();
+	    }
+	if (ctrl->cfg.rxbuf_size >= SOCK_TEST_CFG_BUF_SIZE_MIN)
+	  {
+	    ctrl->rxbuf_size = ctrl->cfg.rxbuf_size;
+	    sock_test_buf_alloc (&ctrl->cfg, 1 /* is_rxbuf */ ,
+				 (uint8_t **) & ctrl->rxbuf,
+				 &ctrl->rxbuf_size);
+	  }
+	else
+	  {
+	    fprintf (stderr,
+		     "ERROR: rxbuf size (%lu) less than minumum (%u)\n",
+		     ctrl->cfg.rxbuf_size, SOCK_TEST_CFG_BUF_SIZE_MIN);
+	    print_usage_and_exit ();
+	  }
+
+	break;
+
+      case 'T':
+	if (sscanf (optarg, "0x%lx", &ctrl->cfg.txbuf_size) != 1)
+	  if (sscanf (optarg, "%ld", &ctrl->cfg.txbuf_size) != 1)
+	    {
+	      fprintf (stderr, "ERROR: Invalid value for option -%c!\n", c);
+	      print_usage_and_exit ();
+	    }
+	if (ctrl->cfg.txbuf_size >= SOCK_TEST_CFG_BUF_SIZE_MIN)
+	  {
+	    ctrl->txbuf_size = ctrl->cfg.txbuf_size;
+	    sock_test_buf_alloc (&ctrl->cfg, 0 /* is_rxbuf */ ,
+				 (uint8_t **) & ctrl->txbuf,
+				 &ctrl->txbuf_size);
+	    ctrl->cfg.total_bytes =
+	      ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
+	  }
+	else
+	  {
+	    fprintf (stderr,
+		     "ERROR: txbuf size (%lu) less than minumum (%u)!\n",
+		     ctrl->cfg.txbuf_size, SOCK_TEST_CFG_BUF_SIZE_MIN);
+	    print_usage_and_exit ();
+	  }
+	break;
+
+      case 'U':
+	ctrl->cfg.test = SOCK_TEST_TYPE_UNI;
+	break;
+
+      case 'B':
+	ctrl->cfg.test = SOCK_TEST_TYPE_BI;
+	break;
+
+      case 'V':
+	ctrl->cfg.verbose = 1;
+	break;
+
+      case '?':
+	switch (optopt)
+	  {
+	  case 'E':
+	  case 'I':
+	  case 'N':
+	  case 'R':
+	  case 'T':
+	  case 'w':
+	    fprintf (stderr, "ERROR: Option -%c requires an argument.\n",
+		     optopt);
+	  default:
+	    if (isprint (optopt))
+	      fprintf (stderr, "ERROR: Unknown option `-%c'.\n", optopt);
+	    else
+	      fprintf (stderr, "ERROR: Unknown option character `\\x%x'.\n",
+		       optopt);
+	  }
+	/* fall thru */
+      case 'h':
+      default:
+	print_usage_and_exit ();
+      }
+
+  if (argc < (optind + 2))
+    {
+      fprintf (stderr, "ERROR: Insufficient number of arguments!\n");
+      print_usage_and_exit ();
+    }
+
+#ifdef VCL_TEST
+  ctrl->fd = vppcom_app_create ("vcl_test_client");
+  if (ctrl->fd < 0)
+    {
+      errno = -ctrl->fd;
+      ctrl->fd = -1;
+    }
+  else
+    {
+      ctrl->fd = vppcom_session_create (VPPCOM_VRF_DEFAULT, VPPCOM_PROTO_TCP,
+					0 /* is_nonblocking */ );
+      if (ctrl->fd < 0)
+	{
+	  errno = -ctrl->fd;
+	  ctrl->fd = -1;
+	}
+    }
+#else
+  ctrl->fd = socket (AF_INET, SOCK_STREAM, 0);
+#endif
+
+  if (ctrl->fd < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "ERROR: socket failed (errno = %d)!\n", errno_val);
+      return ctrl->fd;
+    }
+
+  memset (&scm->server_addr, 0, sizeof (scm->server_addr));
+
+  scm->server_addr.sin_family = AF_INET;
+  inet_pton (AF_INET, argv[optind++], &(scm->server_addr.sin_addr));
+  scm->server_addr.sin_port = htons (atoi (argv[optind]));
+
+#ifdef VCL_TEST
+  scm->server_endpt.vrf = VPPCOM_VRF_DEFAULT;
+  scm->server_endpt.is_ip4 = (scm->server_addr.sin_family == AF_INET);
+  scm->server_endpt.ip = (uint8_t *) & scm->server_addr.sin_addr;
+  scm->server_endpt.port = (uint16_t) scm->server_addr.sin_port;
+#endif
+
+  do
+    {
+      printf ("\nCLIENT: Connecting to server...\n");
+
+#ifdef VCL_TEST
+      rv = vppcom_session_connect (ctrl->fd, &scm->server_endpt);
+#else
+      rv =
+	connect (ctrl->fd, (struct sockaddr *) &scm->server_addr,
+		 sizeof (scm->server_addr));
+#endif
+      if (rv < 0)
+	{
+	  errno_val = errno;
+	  perror ("ERROR in main()");
+	  fprintf (stderr, "ERROR: connect failed (errno = %d)!\n",
+		   errno_val);
+	}
+
+      sock_test_cfg_sync (ctrl);
+      printf ("CLIENT (fd %d): Control socket connected.\n", ctrl->fd);
+    }
+  while (rv < 0);
+
+  sock_test_connect_test_sockets (ctrl->cfg.num_test_sockets);
+
+  while (ctrl->cfg.test != SOCK_TEST_TYPE_EXIT)
+    {
+      if (scm->dump_cfg)
+	{
+	  sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+	  scm->dump_cfg = 0;
+	}
+
+      switch (ctrl->cfg.test)
+	{
+	case SOCK_TEST_TYPE_ECHO:
+	  echo_test_client ();
+	  break;
+
+	case SOCK_TEST_TYPE_UNI:
+	case SOCK_TEST_TYPE_BI:
+	  stream_test_client (ctrl->cfg.test);
+	  break;
+
+	case SOCK_TEST_TYPE_EXIT:
+	  continue;
+
+	case SOCK_TEST_TYPE_NONE:
+	default:
+	  break;
+	}
+      switch (post_test)
+	{
+	case SOCK_TEST_TYPE_EXIT:
+	  switch (ctrl->cfg.test)
+	    {
+	    case SOCK_TEST_TYPE_EXIT:
+	    case SOCK_TEST_TYPE_UNI:
+	    case SOCK_TEST_TYPE_BI:
+	    case SOCK_TEST_TYPE_ECHO:
+	      ctrl->cfg.test = SOCK_TEST_TYPE_EXIT;
+	      continue;
+
+	    case SOCK_TEST_TYPE_NONE:
+	    default:
+	      break;
+	    }
+	  break;
+
+	case SOCK_TEST_TYPE_NONE:
+	case SOCK_TEST_TYPE_ECHO:
+	case SOCK_TEST_TYPE_UNI:
+	case SOCK_TEST_TYPE_BI:
+	default:
+	  break;
+	}
+
+      memset (ctrl->txbuf, 0, ctrl->txbuf_size);
+      memset (ctrl->rxbuf, 0, ctrl->rxbuf_size);
+
+      printf ("\nType some characters and hit <return>\n"
+	      "('" SOCK_TEST_TOKEN_HELP "' for help): ");
+
+      if (fgets (ctrl->txbuf, ctrl->txbuf_size, stdin) != NULL)
+	{
+	  if (strlen (ctrl->txbuf) == 1)
+	    {
+	      printf ("\nCLIENT: Nothing to send!  Please try again...\n");
+	      continue;
+	    }
+	  ctrl->txbuf[strlen (ctrl->txbuf) - 1] = 0;	// chomp the newline.
+
+	  /* Parse input for keywords */
+	  ctrl->cfg.test = parse_input ();
+	}
+    }
+
+  exit_client ();
+#ifdef VCL_TEST
+  vppcom_session_close (ctrl->fd);
+  vppcom_app_destroy ();
+#else
+  close (ctrl->fd);
+#endif
+  return 0;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/uri/sock_test_server.c b/src/uri/sock_test_server.c
new file mode 100644
index 00000000..52c60dc4
--- /dev/null
+++ b/src/uri/sock_test_server.c
@@ -0,0 +1,586 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <ctype.h>
+#include <uri/sock_test.h>
+
+typedef struct
+{
+  uint8_t is_alloc;
+  int fd;
+  uint8_t *buf;
+  uint32_t buf_size;
+  sock_test_cfg_t cfg;
+  sock_test_stats_t stats;
+#ifdef VCL_TEST
+  vppcom_endpt_t endpt;
+  uint8_t ip[16];
+#endif
+} sock_server_conn_t;
+
+#define SOCK_SERVER_MAX_TEST_CONN  10
+typedef struct
+{
+  int listen_fd;
+  size_t num_conn;
+  size_t conn_pool_size;
+  sock_server_conn_t *conn_pool;
+  int nfds;
+  fd_set rd_fdset;
+  fd_set wr_fdset;
+  struct timeval timeout;
+} sock_server_main_t;
+
+sock_server_main_t sock_server_main;
+
+static inline int
+get_nfds (void)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int i, nfds;
+
+  for (nfds = i = 0; i < FD_SETSIZE; i++)
+    {
+      if (FD_ISSET (i, &ssm->rd_fdset) || FD_ISSET (i, &ssm->wr_fdset))
+	nfds = i + 1;
+    }
+  return nfds;
+}
+
+static inline void
+conn_fdset_set (sock_server_conn_t * conn, fd_set * fdset)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+
+  FD_SET (conn->fd, fdset);
+  ssm->nfds = get_nfds ();
+}
+
+static inline void
+conn_fdset_clr (sock_server_conn_t * conn, fd_set * fdset)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+
+  FD_CLR (conn->fd, fdset);
+  ssm->nfds = get_nfds ();
+}
+
+static inline void
+conn_pool_expand (size_t expand_size)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  sock_server_conn_t *conn_pool;
+  size_t new_size = ssm->conn_pool_size + expand_size;
+  int i;
+
+  conn_pool = realloc (ssm->conn_pool, new_size * sizeof (*ssm->conn_pool));
+  if (conn_pool)
+    {
+      for (i = ssm->conn_pool_size; i < new_size; i++)
+	{
+	  sock_server_conn_t *conn = &conn_pool[i];
+	  memset (conn, 0, sizeof (*conn));
+	  sock_test_cfg_init (&conn->cfg);
+	  sock_test_buf_alloc (&conn->cfg, 1 /* is_rxbuf */ ,
+			       &conn->buf, &conn->buf_size);
+	  conn->cfg.txbuf_size = conn->cfg.rxbuf_size;
+	}
+
+      ssm->conn_pool = conn_pool;
+      ssm->conn_pool_size = new_size;
+    }
+  else
+    {
+      int errno_val = errno;
+      perror ("ERROR in conn_pool_expand()");
+      fprintf (stderr, "ERROR: Memory allocation failed (errno = %d)!\n",
+	       errno_val);
+    }
+}
+
+static inline sock_server_conn_t *
+conn_pool_alloc (void)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int i;
+
+  for (i = 0; i < ssm->conn_pool_size; i++)
+    {
+      if (!ssm->conn_pool[i].is_alloc)
+	{
+#ifdef VCL_TEST
+	  ssm->conn_pool[i].endpt.ip = ssm->conn_pool[i].ip;
+#endif
+	  ssm->conn_pool[i].is_alloc = 1;
+	  return (&ssm->conn_pool[i]);
+	}
+    }
+
+  return 0;
+}
+
+static inline void
+conn_pool_free (sock_server_conn_t * conn)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+
+  conn_fdset_clr (conn, &ssm->rd_fdset);
+  conn_fdset_clr (conn, &ssm->wr_fdset);
+  conn->fd = 0;
+  conn->is_alloc = 0;
+}
+
+static inline void
+sync_config_and_reply (sock_server_conn_t * conn, sock_test_cfg_t * rx_cfg)
+{
+  conn->cfg = *rx_cfg;
+  sock_test_buf_alloc (&conn->cfg, 1 /* is_rxbuf */ ,
+		       &conn->buf, &conn->buf_size);
+  conn->cfg.txbuf_size = conn->cfg.rxbuf_size;
+
+  if (conn->cfg.verbose)
+    {
+      printf ("\nSERVER (fd %d): Replying to cfg message!\n", conn->fd);
+      sock_test_cfg_dump (&conn->cfg, 0 /* is_client */ );
+    }
+  (void) sock_test_write (conn->fd, (uint8_t *) & conn->cfg,
+			  sizeof (conn->cfg), NULL, conn->cfg.verbose);
+}
+
+static void
+stream_test_server_start_stop (sock_server_conn_t * conn,
+			       sock_test_cfg_t * rx_cfg)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int client_fd = conn->fd;
+  sock_test_t test = rx_cfg->test;
+
+  if (rx_cfg->ctrl_handle == conn->fd)
+    {
+      int i;
+      clock_gettime (CLOCK_REALTIME, &conn->stats.stop);
+
+      for (i = 0; i < ssm->conn_pool_size; i++)
+	{
+	  sock_server_conn_t *tc = &ssm->conn_pool[i];
+
+	  if (tc->cfg.ctrl_handle == conn->fd)
+	    {
+	      sock_test_stats_accumulate (&conn->stats, &tc->stats);
+
+	      if (conn->cfg.verbose)
+		{
+		  static char buf[64];
+
+		  sprintf (buf, "SERVER (fd %d) RESULTS", tc->fd);
+		  sock_test_stats_dump (buf, &tc->stats, 1 /* show_rx */ ,
+					test == SOCK_TEST_TYPE_BI
+					/* show tx */ ,
+					conn->cfg.verbose);
+		}
+	    }
+	}
+
+      sock_test_stats_dump ("SERVER RESULTS", &conn->stats, 1 /* show_rx */ ,
+			    (test == SOCK_TEST_TYPE_BI) /* show_tx */ ,
+			    conn->cfg.verbose);
+      sock_test_cfg_dump (&conn->cfg, 0 /* is_client */ );
+      if (conn->cfg.verbose)
+	{
+	  printf ("  sock server main\n"
+		  SOCK_TEST_SEPARATOR_STRING
+		  "       buf:  %p\n"
+		  "  buf size:  %u (0x%08x)\n"
+		  SOCK_TEST_SEPARATOR_STRING,
+		  conn->buf, conn->buf_size, conn->buf_size);
+	}
+
+      sync_config_and_reply (conn, rx_cfg);
+      printf ("\nSERVER (fd %d): %s-directional Stream Test Complete!\n"
+	      SOCK_TEST_BANNER_STRING "\n", conn->fd,
+	      test == SOCK_TEST_TYPE_BI ? "Bi" : "Uni");
+    }
+  else
+    {
+      printf ("\n" SOCK_TEST_BANNER_STRING
+	      "SERVER (fd %d): %s-directional Stream Test!\n"
+	      "  Sending client the test cfg to start streaming data...\n",
+	      client_fd, test == SOCK_TEST_TYPE_BI ? "Bi" : "Uni");
+
+      rx_cfg->ctrl_handle = (rx_cfg->ctrl_handle == ~0) ? conn->fd :
+	rx_cfg->ctrl_handle;
+
+      sync_config_and_reply (conn, rx_cfg);
+
+      /* read the 1st chunk, record start time */
+      memset (&conn->stats, 0, sizeof (conn->stats));
+      clock_gettime (CLOCK_REALTIME, &conn->stats.start);
+    }
+}
+
+
+static inline void
+stream_test_server (sock_server_conn_t * conn, int rx_bytes)
+{
+  int client_fd = conn->fd;
+  sock_test_t test = conn->cfg.test;
+
+  if (test == SOCK_TEST_TYPE_BI)
+    (void) sock_test_write (client_fd, conn->buf, rx_bytes, &conn->stats,
+			    conn->cfg.verbose);
+
+  if (conn->stats.rx_bytes >= conn->cfg.total_bytes)
+    {
+      clock_gettime (CLOCK_REALTIME, &conn->stats.stop);
+    }
+}
+
+static inline void
+new_client (void)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int client_fd;
+  sock_server_conn_t *conn;
+
+  if (ssm->conn_pool_size < (ssm->num_conn + SOCK_SERVER_MAX_TEST_CONN + 1))
+    conn_pool_expand (SOCK_SERVER_MAX_TEST_CONN + 1);
+
+  conn = conn_pool_alloc ();
+  if (!conn)
+    {
+      fprintf (stderr, "\nERROR: No free connections!\n");
+      return;
+    }
+
+#ifdef VCL_TEST
+  client_fd = vppcom_session_accept (ssm->listen_fd, &conn->endpt,
+				     -1.0 /* wait forever */ );
+#else
+  client_fd = accept (ssm->listen_fd, (struct sockaddr *) NULL, NULL);
+#endif
+  if (client_fd < 0)
+    {
+      int errno_val;
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "ERROR: accept failed (errno = %d)!\n", errno_val);
+    }
+
+  printf ("SERVER: Got a connection -- fd = %d (0x%08x)!\n",
+	  client_fd, client_fd);
+
+  conn->fd = client_fd;
+  conn_fdset_set (conn, &ssm->rd_fdset);
+}
+
+int
+main (int argc, char **argv)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int client_fd, rv, main_rv = 0;
+  int tx_bytes, rx_bytes, nbytes;
+  sock_server_conn_t *conn;
+  sock_test_cfg_t *rx_cfg;
+  uint32_t xtra = 0;
+  uint64_t xtra_bytes = 0;
+  struct sockaddr_in servaddr;
+  int errno_val;
+  int v, i;
+  uint16_t port = SOCK_TEST_SERVER_PORT;
+  fd_set _rfdset, *rfdset = &_rfdset;
+#ifdef VCL_TEST
+  vppcom_endpt_t endpt;
+#else
+  fd_set _wfdset, *wfdset = &_wfdset;
+#endif
+
+  if ((argc == 2) && (sscanf (argv[1], "%d", &v) == 1))
+    port = (uint16_t) v;
+
+  conn_pool_expand (SOCK_SERVER_MAX_TEST_CONN + 1);
+
+#ifdef VCL_TEST
+  rv = vppcom_app_create ("vcl_test_server");
+  if (rv)
+    {
+      errno = -rv;
+      ssm->listen_fd = -1;
+    }
+  else
+    {
+      ssm->listen_fd =
+	vppcom_session_create (VPPCOM_VRF_DEFAULT, VPPCOM_PROTO_TCP,
+			       0 /* is_nonblocking */ );
+    }
+#else
+  ssm->listen_fd = socket (AF_INET, SOCK_STREAM, 0);
+#endif
+  if (ssm->listen_fd < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "ERROR: socket() failed (errno = %d)!\n", errno_val);
+      return ssm->listen_fd;
+    }
+
+  memset (&servaddr, 0, sizeof (servaddr));
+
+  servaddr.sin_family = AF_INET;
+  servaddr.sin_addr.s_addr = htons (INADDR_ANY);
+  servaddr.sin_port = htons (port);
+
+#ifdef VCL_TEST
+  endpt.vrf = VPPCOM_VRF_DEFAULT;
+  endpt.is_ip4 = (servaddr.sin_family == AF_INET);
+  endpt.ip = (uint8_t *) & servaddr.sin_addr;
+  endpt.port = (uint16_t) servaddr.sin_port;
+
+  rv = vppcom_session_bind (ssm->listen_fd, &endpt);
+  if (rv)
+    {
+      errno = -rv;
+      rv = -1;
+    }
+#else
+  rv =
+    bind (ssm->listen_fd, (struct sockaddr *) &servaddr, sizeof (servaddr));
+#endif
+  if (rv < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "ERROR: bind failed (errno = %d)!\n", errno_val);
+      return rv;
+    }
+
+#ifdef VCL_TEST
+  rv = vppcom_session_listen (ssm->listen_fd, 10);
+  if (rv)
+    {
+      errno = -rv;
+      rv = -1;
+    }
+#else
+  rv = listen (ssm->listen_fd, 10);
+#endif
+  if (rv < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "ERROR: listen failed (errno = %d)!\n", errno_val);
+      return rv;
+    }
+
+  FD_ZERO (&ssm->wr_fdset);
+  FD_ZERO (&ssm->rd_fdset);
+
+  FD_SET (ssm->listen_fd, &ssm->rd_fdset);
+  ssm->nfds = ssm->listen_fd + 1;
+
+  printf ("\nSERVER: Waiting for a client to connect on port %d...\n", port);
+
+  while (1)
+    {
+      _rfdset = ssm->rd_fdset;
+
+#ifdef VCL_TEST
+      rv = vppcom_select (ssm->nfds, (uint64_t *) rfdset, NULL, NULL, 0);
+#else
+      {
+	struct timeval timeout;
+	timeout = ssm->timeout;
+	_wfdset = ssm->wr_fdset;
+	rv = select (ssm->nfds, rfdset, wfdset, NULL, &timeout);
+      }
+#endif
+      if (rv < 0)
+	{
+	  perror ("select()");
+	  fprintf (stderr, "\nERROR: select() failed -- aborting!\n");
+	  main_rv = -1;
+	  goto done;
+	}
+      else if (rv == 0)
+	continue;
+
+      if (FD_ISSET (ssm->listen_fd, rfdset))
+	new_client ();
+
+      for (i = 0; i < ssm->conn_pool_size; i++)
+	{
+	  if (!ssm->conn_pool[i].is_alloc)
+	    continue;
+
+	  conn = &ssm->conn_pool[i];
+	  client_fd = conn->fd;
+
+	  if (FD_ISSET (client_fd, rfdset))
+	    {
+	      rx_bytes = sock_test_read (client_fd, conn->buf,
+					 conn->buf_size, &conn->stats);
+	      if (rx_bytes > 0)
+		{
+		  rx_cfg = (sock_test_cfg_t *) conn->buf;
+		  if (rx_cfg->magic == SOCK_TEST_CFG_CTRL_MAGIC)
+		    {
+		      if (rx_cfg->verbose)
+			{
+			  printf ("SERVER (fd %d): Received a cfg message!\n",
+				  client_fd);
+			  sock_test_cfg_dump (rx_cfg, 0 /* is_client */ );
+			}
+
+		      if (rx_bytes != sizeof (*rx_cfg))
+			{
+			  printf ("SERVER (fd %d): Invalid cfg message "
+				  "size (%d)!\n  Should be %lu bytes.\n",
+				  client_fd, rx_bytes, sizeof (*rx_cfg));
+			  conn->cfg.rxbuf_size = 0;
+			  conn->cfg.num_writes = 0;
+			  if (conn->cfg.verbose)
+			    {
+			      printf ("SERVER (fd %d): Replying to "
+				      "cfg message!\n", client_fd);
+			      sock_test_cfg_dump (rx_cfg, 0 /* is_client */ );
+			    }
+			  sock_test_write (client_fd, (uint8_t *) & conn->cfg,
+					   sizeof (conn->cfg), NULL,
+					   conn->cfg.verbose);
+			  continue;
+			}
+
+		      switch (rx_cfg->test)
+			{
+			case SOCK_TEST_TYPE_NONE:
+			case SOCK_TEST_TYPE_ECHO:
+			  sync_config_and_reply (conn, rx_cfg);
+			  break;
+
+			case SOCK_TEST_TYPE_BI:
+			case SOCK_TEST_TYPE_UNI:
+			  stream_test_server_start_stop (conn, rx_cfg);
+			  break;
+
+			case SOCK_TEST_TYPE_EXIT:
+			  printf ("SERVER: Have a great day, "
+				  "connection %d!\n", client_fd);
+#ifdef VCL_TEST
+			  vppcom_session_close (client_fd);
+#else
+			  close (client_fd);
+#endif
+			  conn_pool_free (conn);
+
+			  if (ssm->nfds == (ssm->listen_fd + 1))
+			    {
+			      printf ("SERVER: All client connections "
+				      "closed.\n\nSERVER: "
+				      "May the force be with you!\n\n");
+			      goto done;
+			    }
+			  break;
+
+			default:
+			  fprintf (stderr, "ERROR: Unknown test type!\n");
+			  sock_test_cfg_dump (rx_cfg, 0 /* is_client */ );
+			  break;
+			}
+		      continue;
+		    }
+
+		  else if ((conn->cfg.test == SOCK_TEST_TYPE_UNI) ||
+			   (conn->cfg.test == SOCK_TEST_TYPE_BI))
+		    {
+		      stream_test_server (conn, rx_bytes);
+		      continue;
+		    }
+
+		  else if (strlen ((char *) conn->buf))
+		    printf ("\nSERVER (fd %d): RX (%d bytes) - '%s'\n",
+			    conn->fd, rx_bytes, conn->buf);
+		}
+	      else		// rx_bytes < 0
+		{
+		  if (errno == ECONNRESET)
+		    {
+		      printf ("\nSERVER: Connection reset by remote peer.\n"
+			      "  Y'all have a great day now!\n\n");
+		      break;
+		    }
+		  else
+		    continue;
+		}
+
+	      if (isascii (conn->buf[0]) && strlen ((const char *) conn->buf))
+		{
+		  if (xtra)
+		    fprintf (stderr,
+			     "ERROR: FIFO not drained in previous test!\n"
+			     "       extra chunks %u (0x%x)\n"
+			     "        extra bytes %lu (0x%lx)\n",
+			     xtra, xtra, xtra_bytes, xtra_bytes);
+
+		  xtra = 0;
+		  xtra_bytes = 0;
+
+		  if (conn->cfg.verbose)
+		    printf ("SERVER (fd %d): Echoing back\n", client_fd);
+
+		  nbytes = strlen ((const char *) conn->buf) + 1;
+
+		  tx_bytes = sock_test_write (client_fd, conn->buf,
+					      nbytes, &conn->stats,
+					      conn->cfg.verbose);
+		  if (tx_bytes >= 0)
+		    printf ("SERVER (fd %d): TX (%d bytes) - '%s'\n",
+			    conn->fd, tx_bytes, conn->buf);
+		}
+
+	      else		// Extraneous read data from non-echo tests???
+		{
+		  xtra++;
+		  xtra_bytes += rx_bytes;
+		}
+	    }
+	}
+    }
+
+done:
+#ifdef VCL_TEST
+  vppcom_session_close (ssm->listen_fd);
+  vppcom_app_destroy ();
+#else
+  close (ssm->listen_fd);
+#endif
+  if (ssm->conn_pool)
+    free (ssm->conn_pool);
+
+  return main_rv;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/uri/vcl_test_client.c b/src/uri/vcl_test_client.c
new file mode 100644
index 00000000..7ab8824f
--- /dev/null
+++ b/src/uri/vcl_test_client.c
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define VCL_TEST
+
+#include <uri/vppcom.h>
+#include <uri/sock_test_client.c>
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/uri/vcl_test_server.c b/src/uri/vcl_test_server.c
new file mode 100644
index 00000000..660d705e
--- /dev/null
+++ b/src/uri/vcl_test_server.c
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define VCL_TEST
+
+#include <uri/vppcom.h>
+#include <uri/sock_test_server.c>
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/uri/vppcom.c b/src/uri/vppcom.c
new file mode 100644
index 00000000..44208cc0
--- /dev/null
+++ b/src/uri/vppcom.c
@@ -0,0 +1,2453 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <svm/svm_fifo_segment.h>
+#include <vlibmemory/api.h>
+#include <vpp/api/vpe_msg_enum.h>
+#include <vnet/session/application_interface.h>
+#include <uri/vppcom.h>
+#include <vlib/unix/unix.h>
+#include <vppinfra/vec_bootstrap.h>
+
+#define vl_typedefs		/* define message structures */
+#include <vpp/api/vpe_all_api_h.h>
+#undef vl_typedefs
+
+/* declare message handlers for each api */
+
+#define vl_endianfun		/* define message structures */
+#include <vpp/api/vpe_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...)
+#define vl_printfun
+#include <vpp/api/vpe_all_api_h.h>
+#undef vl_printfun
+
+#if (CLIB_DEBUG > 0)
+/* Set VPPCOM_DEBUG 2 for connection debug, 3 for read/write debug output */
+#define VPPCOM_DEBUG 1
+#else
+#define VPPCOM_DEBUG 0
+#endif
+
+/*
+ * VPPCOM Private definitions and functions.
+ */
+typedef enum
+{
+  STATE_APP_START,
+  STATE_APP_CONN_VPP,
+  STATE_APP_ENABLED,
+  STATE_APP_ATTACHED,
+} app_state_t;
+
+typedef enum
+{
+  STATE_START,
+  STATE_CONNECT,
+  STATE_LISTEN,
+  STATE_ACCEPT,
+  STATE_DISCONNECT,
+  STATE_FAILED
+} session_state_t;
+
+typedef struct
+{
+  volatile session_state_t state;
+
+  svm_fifo_t *server_rx_fifo;
+  svm_fifo_t *server_tx_fifo;
+  u32 sm_seg_index;
+  u64 vpp_session_handle;
+  unix_shared_memory_queue_t *event_queue;
+
+  /* Socket configuration state */
+  u8 is_server;
+  u8 is_listen;
+  u8 is_cut_thru;
+  u8 is_nonblocking;
+  u32 vrf;
+  u8 is_ip4;
+  u8 ip[16];
+  u16 port;
+  u8 proto;
+  u64 client_queue_address;
+  u64 options[16];
+} session_t;
+
+typedef struct vppcom_cfg_t_
+{
+  u64 heapsize;
+  u64 segment_baseva;
+  u32 segment_size;
+  u32 add_segment_size;
+  u32 preallocated_fifo_pairs;
+  u32 rx_fifo_size;
+  u32 tx_fifo_size;
+  u32 event_queue_size;
+  u32 listen_queue_size;
+  f64 app_timeout;
+  f64 session_timeout;
+  f64 accept_timeout;
+} vppcom_cfg_t;
+
+typedef struct vppcom_main_t_
+{
+  u8 init;
+  u32 *client_session_index_fifo;
+  volatile u32 bind_session_index;
+  u32 tx_event_id;
+  int main_cpu;
+
+  /* vpe input queue */
+  unix_shared_memory_queue_t *vl_input_queue;
+
+  /* API client handle */
+  u32 my_client_index;
+
+  /* Session pool */
+  clib_spinlock_t sessions_lockp;
+  session_t *sessions;
+
+  /* Hash table for disconnect processing */
+  uword *session_index_by_vpp_handles;
+
+  /* Select bitmaps */
+  clib_bitmap_t *rd_bitmap;
+  clib_bitmap_t *wr_bitmap;
+  clib_bitmap_t *ex_bitmap;
+
+  /* Our event queue */
+  unix_shared_memory_queue_t *app_event_queue;
+
+  /* unique segment name counter */
+  u32 unique_segment_index;
+
+  pid_t my_pid;
+
+  /* For deadman timers */
+  clib_time_t clib_time;
+
+  /* State of the connection, shared between msg RX thread and main thread */
+  volatile app_state_t app_state;
+
+  vppcom_cfg_t cfg;
+
+  /* VNET_API_ERROR_FOO -> "Foo" hash table */
+  uword *error_string_by_error_number;
+} vppcom_main_t;
+
+vppcom_main_t vppcom_main = {.my_client_index = ~0 };
+
+static const char *
+vppcom_app_state_str (app_state_t state)
+{
+  char *st;
+
+  switch (state)
+    {
+    case STATE_APP_START:
+      st = "STATE_APP_START";
+      break;
+
+    case STATE_APP_CONN_VPP:
+      st = "STATE_APP_CONN_VPP";
+      break;
+
+    case STATE_APP_ENABLED:
+      st = "STATE_APP_ENABLED";
+      break;
+
+    case STATE_APP_ATTACHED:
+      st = "STATE_APP_ATTACHED";
+      break;
+
+    default:
+      st = "UNKNOWN_APP_STATE";
+      break;
+    }
+
+  return st;
+}
+
+static const char *
+vppcom_session_state_str (session_state_t state)
+{
+  char *st;
+
+  switch (state)
+    {
+    case STATE_START:
+      st = "STATE_START";
+      break;
+
+    case STATE_CONNECT:
+      st = "STATE_CONNECT";
+      break;
+
+    case STATE_LISTEN:
+      st = "STATE_LISTEN";
+      break;
+
+    case STATE_ACCEPT:
+      st = "STATE_ACCEPT";
+      break;
+
+    case STATE_DISCONNECT:
+      st = "STATE_DISCONNECT";
+      break;
+
+    case STATE_FAILED:
+      st = "STATE_FAILED";
+      break;
+
+    default:
+      st = "UNKNOWN_STATE";
+      break;
+    }
+
+  return st;
+}
+
+/*
+ * VPPCOM Utility Functions
+ */
+static inline int
+vppcom_session_at_index (u32 session_index, session_t * volatile *sess)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+
+  /* Assumes that caller has acquired spinlock: vcm->sessions_lockp */
+  if (PREDICT_FALSE ((session_index == ~0) ||
+		     pool_is_free_index (vcm->sessions, session_index)))
+    {
+      clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		    vcm->my_pid, session_index);
+      return VPPCOM_EBADFD;
+    }
+  *sess = pool_elt_at_index (vcm->sessions, session_index);
+  return VPPCOM_OK;
+}
+
+static int
+vppcom_connect_to_vpp (char *app_name)
+{
+  api_main_t *am = &api_main;
+  vppcom_main_t *vcm = &vppcom_main;
+
+  if (VPPCOM_DEBUG > 0)
+    printf ("\nConnecting to VPP api...");
+  if (vl_client_connect_to_vlib ("/vpe-api", app_name, 32) < 0)
+    {
+      clib_warning ("[%d] connect to vpp (%s) failed!",
+		    vcm->my_pid, app_name);
+      return VPPCOM_ECONNREFUSED;
+    }
+
+  vcm->vl_input_queue = am->shmem_hdr->vl_input_queue;
+  vcm->my_client_index = am->my_client_index;
+  if (VPPCOM_DEBUG > 0)
+    printf (" connected!\n");
+
+  vcm->app_state = STATE_APP_CONN_VPP;
+  return VPPCOM_OK;
+}
+
+static u8 *
+format_api_error (u8 * s, va_list * args)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  i32 error = va_arg (*args, u32);
+  uword *p;
+
+  p = hash_get (vcm->error_string_by_error_number, -error);
+
+  if (p)
+    s = format (s, "%s (%d)", p[0], error);
+  else
+    s = format (s, "%d", error);
+  return s;
+}
+
+static void
+vppcom_init_error_string_table (void)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+
+  vcm->error_string_by_error_number = hash_create (0, sizeof (uword));
+
+#define _(n,v,s) hash_set (vcm->error_string_by_error_number, -v, s);
+  foreach_vnet_api_error;
+#undef _
+
+  hash_set (vcm->error_string_by_error_number, 99, "Misc");
+}
+
+static inline int
+vppcom_wait_for_app_state_change (app_state_t app_state)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  f64 timeout = clib_time_now (&vcm->clib_time) + vcm->cfg.app_timeout;
+
+  while (clib_time_now (&vcm->clib_time) < timeout)
+    {
+      if (vcm->app_state == app_state)
+	return VPPCOM_OK;
+    }
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] timeout waiting for state %s (%d)", vcm->my_pid,
+		  vppcom_app_state_str (app_state), app_state);
+  return VPPCOM_ETIMEDOUT;
+}
+
+static inline int
+vppcom_wait_for_session_state_change (u32 session_index,
+				      session_state_t state,
+				      f64 wait_for_time)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  f64 timeout = clib_time_now (&vcm->clib_time) + wait_for_time;
+  session_t *volatile session;
+  int rv;
+
+  do
+    {
+      clib_spinlock_lock (&vcm->sessions_lockp);
+      rv = vppcom_session_at_index (session_index, &session);
+      if (PREDICT_FALSE (rv))
+	{
+	  clib_spinlock_unlock (&vcm->sessions_lockp);
+	  return rv;
+	}
+      if (session->state == state)
+	{
+	  clib_spinlock_unlock (&vcm->sessions_lockp);
+	  return VPPCOM_OK;
+	}
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+    }
+  while (clib_time_now (&vcm->clib_time) < timeout);
+
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] timeout waiting for state %s (%d)", vcm->my_pid,
+		  vppcom_session_state_str (state), state);
+  return VPPCOM_ETIMEDOUT;
+}
+
+static inline int
+vppcom_wait_for_client_session_index (f64 wait_for_time)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  f64 timeout = clib_time_now (&vcm->clib_time) + wait_for_time;
+
+  do
+    {
+      if (clib_fifo_elts (vcm->client_session_index_fifo))
+	return VPPCOM_OK;
+    }
+  while (clib_time_now (&vcm->clib_time) < timeout);
+
+  if (wait_for_time == 0)
+    return VPPCOM_EAGAIN;
+
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] timeout waiting for client_session_index",
+		  vcm->my_pid);
+  return VPPCOM_ETIMEDOUT;
+}
+
+/*
+ * VPP-API message functions
+ */
+static void
+vppcom_send_session_enable_disable (u8 is_enable)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vl_api_session_enable_disable_t *bmp;
+  bmp = vl_msg_api_alloc (sizeof (*bmp));
+  memset (bmp, 0, sizeof (*bmp));
+
+  bmp->_vl_msg_id = ntohs (VL_API_SESSION_ENABLE_DISABLE);
+  bmp->client_index = vcm->my_client_index;
+  bmp->context = htonl (0xfeedface);
+  bmp->is_enable = is_enable;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
+}
+
+static int
+vppcom_app_session_enable (void)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  int rv;
+
+  if (vcm->app_state != STATE_APP_ENABLED)
+    {
+      vppcom_send_session_enable_disable (1 /* is_enabled == TRUE */ );
+      rv = vppcom_wait_for_app_state_change (STATE_APP_ENABLED);
+      if (PREDICT_FALSE (rv))
+	{
+	  if (VPPCOM_DEBUG > 0)
+	    clib_warning ("[%d] Session enable timed out, rv = %s (%d)",
+			  vcm->my_pid, vppcom_retval_str (rv), rv);
+	  return rv;
+	}
+    }
+  return VPPCOM_OK;
+}
+
+static void
+  vl_api_session_enable_disable_reply_t_handler
+  (vl_api_session_enable_disable_reply_t * mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+
+  if (mp->retval)
+    {
+      clib_warning ("[%d] session_enable_disable failed: %U", vcm->my_pid,
+		    format_api_error, ntohl (mp->retval));
+    }
+  else
+    vcm->app_state = STATE_APP_ENABLED;
+}
+
+static void
+vppcom_app_send_attach (void)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vl_api_application_attach_t *bmp;
+  bmp = vl_msg_api_alloc (sizeof (*bmp));
+  memset (bmp, 0, sizeof (*bmp));
+
+  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_ATTACH);
+  bmp->client_index = vcm->my_client_index;
+  bmp->context = htonl (0xfeedface);
+  bmp->options[APP_OPTIONS_FLAGS] =
+    APP_OPTIONS_FLAGS_USE_FIFO | APP_OPTIONS_FLAGS_ADD_SEGMENT;
+  bmp->options[SESSION_OPTIONS_SEGMENT_SIZE] = vcm->cfg.segment_size;
+  bmp->options[SESSION_OPTIONS_ADD_SEGMENT_SIZE] = vcm->cfg.add_segment_size;
+  bmp->options[SESSION_OPTIONS_RX_FIFO_SIZE] = vcm->cfg.rx_fifo_size;
+  bmp->options[SESSION_OPTIONS_TX_FIFO_SIZE] = vcm->cfg.tx_fifo_size;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
+}
+
+static int
+vppcom_app_attach (void)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  int rv;
+
+  vppcom_app_send_attach ();
+  rv = vppcom_wait_for_app_state_change (STATE_APP_ATTACHED);
+  if (PREDICT_FALSE (rv))
+    {
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] application attach timed out, rv = %s (%d)",
+		      vcm->my_pid, vppcom_retval_str (rv), rv);
+      return rv;
+    }
+  return VPPCOM_OK;
+}
+
+static void
+vppcom_app_detach (void)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vl_api_application_detach_t *bmp;
+  bmp = vl_msg_api_alloc (sizeof (*bmp));
+  memset (bmp, 0, sizeof (*bmp));
+
+  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_DETACH);
+  bmp->client_index = vcm->my_client_index;
+  bmp->context = htonl (0xfeedface);
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
+}
+
+static void
+vl_api_application_attach_reply_t_handler (vl_api_application_attach_reply_t *
+					   mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  static svm_fifo_segment_create_args_t _a;
+  svm_fifo_segment_create_args_t *a = &_a;
+  int rv;
+
+  memset (a, 0, sizeof (*a));
+  if (mp->retval)
+    {
+      clib_warning ("[%d] attach failed: %U", vcm->my_pid,
+		    format_api_error, ntohl (mp->retval));
+      return;
+    }
+
+  if (mp->segment_name_length == 0)
+    {
+      clib_warning ("[%d] segment_name_length zero", vcm->my_pid);
+      return;
+    }
+
+  a->segment_name = (char *) mp->segment_name;
+  a->segment_size = mp->segment_size;
+
+  ASSERT (mp->app_event_queue_address);
+
+  /* Attach to the segment vpp created */
+  rv = svm_fifo_segment_attach (a);
+  vec_reset_length (a->new_segment_indices);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_warning ("[%d] svm_fifo_segment_attach ('%s') failed", vcm->my_pid,
+		    mp->segment_name);
+      return;
+    }
+
+  vcm->app_event_queue =
+    uword_to_pointer (mp->app_event_queue_address,
+		      unix_shared_memory_queue_t *);
+
+  vcm->app_state = STATE_APP_ATTACHED;
+}
+
+static void
+vl_api_application_detach_reply_t_handler (vl_api_application_detach_reply_t *
+					   mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+
+  if (mp->retval)
+    clib_warning ("[%d] detach failed: %U", vcm->my_pid, format_api_error,
+		  ntohl (mp->retval));
+
+  vcm->app_state = STATE_APP_ENABLED;
+}
+
+static void
+vl_api_disconnect_session_reply_t_handler (vl_api_disconnect_session_reply_t *
+					   mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  uword *p;
+
+  p = hash_get (vcm->session_index_by_vpp_handles, mp->handle);
+  if (p)
+    {
+      session_t *session = 0;
+      int rv;
+      clib_spinlock_lock (&vcm->sessions_lockp);
+      rv = vppcom_session_at_index (p[0], &session);
+      if (PREDICT_FALSE (rv))
+	{
+	  if (VPPCOM_DEBUG > 1)
+	    clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+			  vcm->my_pid, p[0]);
+	}
+      hash_unset (vcm->session_index_by_vpp_handles, mp->handle);
+      session->state = STATE_DISCONNECT;
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+    }
+  else
+    {
+      if (VPPCOM_DEBUG > 1)
+	clib_warning ("[%d] couldn't find session key %llx", vcm->my_pid,
+		      mp->handle);
+    }
+
+  if (mp->retval)
+    clib_warning ("[%d] disconnect_session failed: %U", vcm->my_pid,
+		  format_api_error, ntohl (mp->retval));
+}
+
+static void
+vl_api_map_another_segment_t_handler (vl_api_map_another_segment_t * mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  static svm_fifo_segment_create_args_t _a;
+  svm_fifo_segment_create_args_t *a = &_a;
+  int rv;
+
+  memset (a, 0, sizeof (*a));
+  a->segment_name = (char *) mp->segment_name;
+  a->segment_size = mp->segment_size;
+  /* Attach to the segment vpp created */
+  rv = svm_fifo_segment_attach (a);
+  vec_reset_length (a->new_segment_indices);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_warning ("[%d] svm_fifo_segment_attach ('%s') failed",
+		    vcm->my_pid, mp->segment_name);
+      return;
+    }
+  if (VPPCOM_DEBUG > 1)
+    clib_warning ("[%d] mapped new segment '%s' size %d", vcm->my_pid,
+		  mp->segment_name, mp->segment_size);
+}
+
+static void
+vl_api_disconnect_session_t_handler (vl_api_disconnect_session_t * mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  vl_api_disconnect_session_reply_t *rmp;
+  uword *p;
+  int rv = 0;
+
+  p = hash_get (vcm->session_index_by_vpp_handles, mp->handle);
+  if (p)
+    {
+      int rval;
+      clib_spinlock_lock (&vcm->sessions_lockp);
+      rval = vppcom_session_at_index (p[0], &session);
+      if (PREDICT_FALSE (rval))
+	{
+	  if (VPPCOM_DEBUG > 1)
+	    clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+			  vcm->my_pid, p[0]);
+	}
+      else
+	pool_put (vcm->sessions, session);
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      hash_unset (vcm->session_index_by_vpp_handles, mp->handle);
+    }
+  else
+    {
+      clib_warning ("[%d] couldn't find session key %llx", vcm->my_pid,
+		    mp->handle);
+      rv = -11;
+    }
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  memset (rmp, 0, sizeof (*rmp));
+
+  rmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION_REPLY);
+  rmp->retval = htonl (rv);
+  rmp->handle = mp->handle;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & rmp);
+}
+
+static void
+vl_api_reset_session_t_handler (vl_api_reset_session_t * mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  vl_api_reset_session_reply_t *rmp;
+  uword *p;
+  int rv = 0;
+
+  p = hash_get (vcm->session_index_by_vpp_handles, mp->handle);
+  if (p)
+    {
+      int rval;
+      clib_spinlock_lock (&vcm->sessions_lockp);
+      rval = vppcom_session_at_index (p[0], &session);
+      if (PREDICT_FALSE (rval))
+	{
+	  if (VPPCOM_DEBUG > 1)
+	    clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+			  vcm->my_pid, p[0]);
+	}
+      else
+	pool_put (vcm->sessions, session);
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      hash_unset (vcm->session_index_by_vpp_handles, mp->handle);
+    }
+  else
+    {
+      clib_warning ("[%d] couldn't find session key %llx", vcm->my_pid,
+		    mp->handle);
+      rv = -11;
+    }
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_RESET_SESSION_REPLY);
+  rmp->retval = htonl (rv);
+  rmp->handle = mp->handle;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & rmp);
+}
+
+static void
+vl_api_connect_sock_reply_t_handler (vl_api_connect_sock_reply_t * mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session;
+  u32 session_index;
+  svm_fifo_t *rx_fifo, *tx_fifo;
+  u8 is_cut_thru = 0;
+  int rv;
+
+  if (mp->retval)
+    {
+      clib_warning ("[%d] connect failed: %U", vcm->my_pid, format_api_error,
+		    ntohl (mp->retval));
+      return;
+    }
+
+  session_index = ntohl (mp->app_connect);
+  if (VPPCOM_DEBUG > 1)
+    clib_warning ("[%d] app_connect = %d 0x%08x", vcm->my_pid,
+		  session_index, session_index);
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  if (pool_is_free_index (vcm->sessions, session_index))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 1)
+	clib_warning ("[%d] invalid session, sid %d is closed!",
+		      vcm->my_pid, session_index);
+      return;
+    }
+
+  /* We've been redirected */
+  if (mp->segment_name_length > 0)
+    {
+      static svm_fifo_segment_create_args_t _a;
+      svm_fifo_segment_create_args_t *a = &_a;
+
+      is_cut_thru = 1;
+      memset (a, 0, sizeof (*a));
+      a->segment_name = (char *) mp->segment_name;
+      if (VPPCOM_DEBUG > 1)
+	clib_warning ("[%d] cut-thru segment: %s", vcm->my_pid,
+		      a->segment_name);
+      rv = svm_fifo_segment_attach (a);
+      vec_reset_length (a->new_segment_indices);
+      if (PREDICT_FALSE (rv))
+	{
+	  clib_warning ("[%d] sm_fifo_segment_attach ('%s') failed",
+			vcm->my_pid, a->segment_name);
+	  return;
+	}
+    }
+
+  /*
+   * Setup session
+   */
+  if (VPPCOM_DEBUG > 1)
+    clib_warning ("[%d] client sid %d", vcm->my_pid, session_index);
+
+  session = pool_elt_at_index (vcm->sessions, session_index);
+  session->is_cut_thru = is_cut_thru;
+  session->event_queue = uword_to_pointer (mp->vpp_event_queue_address,
+					   unix_shared_memory_queue_t *);
+
+  rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
+  rx_fifo->client_session_index = session_index;
+  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
+  tx_fifo->client_session_index = session_index;
+
+  session->server_rx_fifo = rx_fifo;
+  session->server_tx_fifo = tx_fifo;
+  session->vpp_session_handle = mp->handle;
+  session->state = STATE_CONNECT;
+
+  /* Add it to lookup table */
+  hash_set (vcm->session_index_by_vpp_handles, mp->handle, session_index);
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+}
+
+static void
+vppcom_send_connect_sock (session_t * session, u32 session_index)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vl_api_connect_sock_t *cmp;
+
+  /* Assumes caller as acquired the spinlock: vcm->sessions_lockp */
+  session->is_server = 0;
+  cmp = vl_msg_api_alloc (sizeof (*cmp));
+  memset (cmp, 0, sizeof (*cmp));
+  cmp->_vl_msg_id = ntohs (VL_API_CONNECT_SOCK);
+  cmp->client_index = vcm->my_client_index;
+  cmp->context = htonl (0xfeedface);
+  cmp->app_connect = session_index;
+
+  if (VPPCOM_DEBUG > 1)
+    clib_warning ("[%d] session_index = %d 0x%08x, app_connect = %d 0x%08x",
+		  vcm->my_pid, session_index, session_index,
+		  cmp->app_connect, cmp->app_connect);
+
+  cmp->vrf = session->vrf;
+  cmp->is_ip4 = session->is_ip4;
+  clib_memcpy (cmp->ip, session->ip, (session->is_ip4 ?
+				      sizeof (ip4_address_t) :
+				      sizeof (ip6_address_t)));
+  cmp->port = session->port;
+  cmp->proto = session->proto;
+  clib_memcpy (cmp->options, session->options, sizeof (cmp->options));
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & cmp);
+}
+
+static int
+vppcom_send_disconnect (u32 session_index)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vl_api_disconnect_session_t *dmp;
+  session_t *session = 0;
+  int rv;
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 1)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, session_index);
+      return rv;
+    }
+
+  dmp = vl_msg_api_alloc (sizeof (*dmp));
+  memset (dmp, 0, sizeof (*dmp));
+  dmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION);
+  dmp->client_index = vcm->my_client_index;
+  dmp->handle = session->vpp_session_handle;
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & dmp);
+  return VPPCOM_OK;
+}
+
+static void
+vl_api_bind_sock_reply_t_handler (vl_api_bind_sock_reply_t * mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  int rv;
+
+  if (mp->retval)
+    clib_warning ("[%d] bind failed: %U", vcm->my_pid, format_api_error,
+		  ntohl (mp->retval));
+
+  ASSERT (vcm->bind_session_index != ~0);
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (vcm->bind_session_index, &session);
+  if (rv == VPPCOM_OK)
+    {
+      session->vpp_session_handle = mp->handle;
+      hash_set (vcm->session_index_by_vpp_handles, mp->handle,
+		vcm->bind_session_index);
+      session->state = mp->retval ? STATE_FAILED : STATE_LISTEN;
+      vcm->bind_session_index = ~0;
+    }
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+}
+
+static void
+vl_api_unbind_sock_reply_t_handler (vl_api_unbind_sock_reply_t * mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  int rv;
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (vcm->bind_session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      if (VPPCOM_DEBUG > 1)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, vcm->bind_session_index);
+    }
+
+  if (mp->retval)
+    clib_warning ("[%d] unbind failed: %U", vcm->my_pid, format_api_error,
+		  ntohl (mp->retval));
+
+  vcm->bind_session_index = ~0;
+  session->state = STATE_START;
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+}
+
+u8 *
+format_ip4_address (u8 * s, va_list * args)
+{
+  u8 *a = va_arg (*args, u8 *);
+  return format (s, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
+}
+
+u8 *
+format_ip6_address (u8 * s, va_list * args)
+{
+  ip6_address_t *a = va_arg (*args, ip6_address_t *);
+  u32 i, i_max_n_zero, max_n_zeros, i_first_zero, n_zeros, last_double_colon;
+
+  i_max_n_zero = ARRAY_LEN (a->as_u16);
+  max_n_zeros = 0;
+  i_first_zero = i_max_n_zero;
+  n_zeros = 0;
+  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
+    {
+      u32 is_zero = a->as_u16[i] == 0;
+      if (is_zero && i_first_zero >= ARRAY_LEN (a->as_u16))
+	{
+	  i_first_zero = i;
+	  n_zeros = 0;
+	}
+      n_zeros += is_zero;
+      if ((!is_zero && n_zeros > max_n_zeros)
+	  || (i + 1 >= ARRAY_LEN (a->as_u16) && n_zeros > max_n_zeros))
+	{
+	  i_max_n_zero = i_first_zero;
+	  max_n_zeros = n_zeros;
+	  i_first_zero = ARRAY_LEN (a->as_u16);
+	  n_zeros = 0;
+	}
+    }
+
+  last_double_colon = 0;
+  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
+    {
+      if (i == i_max_n_zero && max_n_zeros > 1)
+	{
+	  s = format (s, "::");
+	  i += max_n_zeros - 1;
+	  last_double_colon = 1;
+	}
+      else
+	{
+	  s = format (s, "%s%x",
+		      (last_double_colon || i == 0) ? "" : ":",
+		      clib_net_to_host_u16 (a->as_u16[i]));
+	  last_double_colon = 0;
+	}
+    }
+
+  return s;
+}
+
+/* Format an IP46 address. */
+u8 *
+format_ip46_address (u8 * s, va_list * args)
+{
+  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
+  ip46_type_t type = va_arg (*args, ip46_type_t);
+  int is_ip4 = 1;
+
+  switch (type)
+    {
+    case IP46_TYPE_ANY:
+      is_ip4 = ip46_address_is_ip4 (ip46);
+      break;
+    case IP46_TYPE_IP4:
+      is_ip4 = 1;
+      break;
+    case IP46_TYPE_IP6:
+      is_ip4 = 0;
+      break;
+    }
+
+  return is_ip4 ?
+    format (s, "%U", format_ip4_address, &ip46->ip4) :
+    format (s, "%U", format_ip6_address, &ip46->ip6);
+}
+
+static void
+vl_api_accept_session_t_handler (vl_api_accept_session_t * mp)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vl_api_accept_session_reply_t *rmp;
+  svm_fifo_t *rx_fifo, *tx_fifo;
+  session_t *session;
+  u32 session_index;
+  int rv = 0;
+
+  if (!clib_fifo_free_elts (vcm->client_session_index_fifo))
+    {
+      clib_warning ("[%d] client session queue is full!", vcm->my_pid);
+      rv = VNET_API_ERROR_QUEUE_FULL;
+      goto send_reply;
+    }
+
+  if (VPPCOM_DEBUG > 1)
+    {
+      u8 *ip_str = format (0, "%U", format_ip46_address, &mp->ip, mp->is_ip4);
+      clib_warning ("[%d] accepted session from: %s:%d", vcm->my_pid, ip_str,
+		    clib_net_to_host_u16 (mp->port));
+      vec_free (ip_str);
+    }
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  /* Allocate local session and set it up */
+  pool_get (vcm->sessions, session);
+  memset (session, 0, sizeof (*session));
+  session_index = session - vcm->sessions;
+
+  rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
+  rx_fifo->client_session_index = session_index;
+  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
+  tx_fifo->client_session_index = session_index;
+
+  session->server_rx_fifo = rx_fifo;
+  session->server_tx_fifo = tx_fifo;
+  session->event_queue = uword_to_pointer (mp->vpp_event_queue_address,
+					   unix_shared_memory_queue_t *);
+  session->state = STATE_ACCEPT;
+  session->is_cut_thru = 0;
+  session->port = ntohs (mp->port);
+  session->is_ip4 = mp->is_ip4;
+  clib_memcpy (session->ip, mp->ip, (mp->is_ip4 ?
+				     sizeof (ip4_address_t) :
+				     sizeof (ip6_address_t)));
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+
+  /* Add it to lookup table */
+  hash_set (vcm->session_index_by_vpp_handles, mp->handle, session_index);
+
+  clib_fifo_add1 (vcm->client_session_index_fifo, session_index);
+
+  /*
+   * Send accept reply to vpp
+   */
+send_reply:
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_ACCEPT_SESSION_REPLY);
+  rmp->retval = htonl (rv);
+  rmp->handle = mp->handle;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & rmp);
+}
+
+/*
+ * Acting as server for redirected connect requests
+ */
+static void
+vl_api_connect_sock_t_handler (vl_api_connect_sock_t * mp)
+{
+  static svm_fifo_segment_create_args_t _a;
+  svm_fifo_segment_create_args_t *a = &_a;
+  vppcom_main_t *vcm = &vppcom_main;
+  u32 session_index;
+  svm_fifo_segment_private_t *seg;
+  unix_shared_memory_queue_t *client_q;
+  vl_api_connect_sock_reply_t *rmp;
+  session_t *session = 0;
+  int rv = 0;
+  svm_fifo_t *rx_fifo;
+  svm_fifo_t *tx_fifo;
+  unix_shared_memory_queue_t *event_q = 0;
+
+  if (!clib_fifo_free_elts (vcm->client_session_index_fifo))
+    {
+      if (VPPCOM_DEBUG > 1)
+	clib_warning ("[%d] client session queue is full!", vcm->my_pid);
+      rv = VNET_API_ERROR_QUEUE_FULL;
+      goto send_reply;
+    }
+
+  /* Create the segment */
+  memset (a, 0, sizeof (*a));
+  a->segment_name = (char *) format ((u8 *) a->segment_name, "%d:segment%d%c",
+				     vcm->my_pid, vcm->unique_segment_index++,
+				     0);
+  a->segment_size = vcm->cfg.segment_size;
+  a->preallocated_fifo_pairs = vcm->cfg.preallocated_fifo_pairs;
+  a->rx_fifo_size = vcm->cfg.rx_fifo_size;
+  a->tx_fifo_size = vcm->cfg.tx_fifo_size;
+
+  rv = svm_fifo_segment_create (a);
+  if (PREDICT_FALSE (rv))
+    {
+      if (VPPCOM_DEBUG > 1)
+	clib_warning ("[%d] svm_fifo_segment_create ('%s') failed",
+		      vcm->my_pid, a->segment_name);
+      vec_reset_length (a->new_segment_indices);
+      rv = VNET_API_ERROR_URI_FIFO_CREATE_FAILED;
+      goto send_reply;
+    }
+
+  if (VPPCOM_DEBUG > 1)
+    clib_warning ("[%d] created segment '%s'", vcm->my_pid, a->segment_name);
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  pool_get (vcm->sessions, session);
+  memset (session, 0, sizeof (*session));
+  session_index = session - vcm->sessions;
+
+  session->sm_seg_index = a->new_segment_indices[0];
+  vec_reset_length (a->new_segment_indices);
+
+  seg = svm_fifo_get_segment (session->sm_seg_index);
+  rx_fifo = session->server_rx_fifo =
+    svm_fifo_segment_alloc_fifo (seg, vcm->cfg.rx_fifo_size,
+				 FIFO_SEGMENT_RX_FREELIST);
+  if (PREDICT_FALSE (!session->server_rx_fifo))
+    {
+      svm_fifo_segment_delete (seg);
+      clib_warning ("[%d] rx fifo alloc failed, size %ld (0x%lx)",
+		    vcm->my_pid, vcm->cfg.rx_fifo_size,
+		    vcm->cfg.rx_fifo_size);
+      rv = VNET_API_ERROR_URI_FIFO_CREATE_FAILED;
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      goto send_reply;
+    }
+
+  tx_fifo = session->server_tx_fifo =
+    svm_fifo_segment_alloc_fifo (seg, vcm->cfg.tx_fifo_size,
+				 FIFO_SEGMENT_TX_FREELIST);
+  if (PREDICT_FALSE (!session->server_tx_fifo))
+    {
+      svm_fifo_segment_delete (seg);
+      if (VPPCOM_DEBUG > 1)
+	clib_warning ("[%d] tx fifo alloc failed, size %ld (0x%lx)",
+		      vcm->my_pid, vcm->cfg.tx_fifo_size,
+		      vcm->cfg.tx_fifo_size);
+      rv = VNET_API_ERROR_URI_FIFO_CREATE_FAILED;
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      goto send_reply;
+    }
+
+  session->server_rx_fifo->master_session_index = session_index;
+  session->server_tx_fifo->master_session_index = session_index;
+  session->client_queue_address = mp->client_queue_address;
+  session->is_cut_thru = 1;
+  session->is_server = 1;
+  session->is_ip4 = mp->is_ip4;
+  session->port = mp->port;
+  {
+    void *oldheap;
+    ssvm_shared_header_t *sh = seg->ssvm.sh;
+
+    ssvm_lock_non_recursive (sh, 1);
+    oldheap = ssvm_push_heap (sh);
+    event_q = session->event_queue =
+      unix_shared_memory_queue_init (vcm->cfg.event_queue_size,
+				     sizeof (session_fifo_event_t),
+				     vcm->my_pid, 0 /* signal not sent */ );
+    ssvm_pop_heap (oldheap);
+    ssvm_unlock_non_recursive (sh);
+  }
+  clib_memcpy (session->ip, mp->ip, (mp->is_ip4 ?
+				     sizeof (ip4_address_t) :
+				     sizeof (ip6_address_t)));
+  session->state = STATE_ACCEPT;
+  if (VPPCOM_DEBUG > 1)
+    clib_warning ("[%d] Connected cut-thru to client: sid %d",
+		  vcm->my_pid, session_index);
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+  clib_fifo_add1 (vcm->client_session_index_fifo, session_index);
+
+send_reply:
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  memset (rmp, 0, sizeof (*rmp));
+
+  rmp->_vl_msg_id = ntohs (VL_API_CONNECT_SOCK_REPLY);
+  rmp->context = mp->context;
+  rmp->app_connect = htonl (mp->app_connect);
+  rmp->retval = htonl (rv);
+  rmp->segment_name_length = vec_len (a->segment_name);
+  clib_memcpy (rmp->segment_name, a->segment_name, vec_len (a->segment_name));
+  vec_reset_length (a->segment_name);
+
+  if (event_q)
+    {
+      rmp->vpp_event_queue_address = pointer_to_uword (event_q);
+      rmp->server_rx_fifo = pointer_to_uword (rx_fifo);
+      rmp->server_tx_fifo = pointer_to_uword (tx_fifo);
+    }
+  client_q =
+    uword_to_pointer (mp->client_queue_address, unix_shared_memory_queue_t *);
+
+  ASSERT (client_q);
+  vl_msg_api_send_shmem (client_q, (u8 *) & rmp);
+}
+
+static void
+vppcom_send_bind_sock (session_t * session)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vl_api_bind_sock_t *bmp;
+
+  /* Assumes caller has acquired spinlock: vcm->sessions_lockp */
+  session->is_server = 1;
+  bmp = vl_msg_api_alloc (sizeof (*bmp));
+  memset (bmp, 0, sizeof (*bmp));
+
+  bmp->_vl_msg_id = ntohs (VL_API_BIND_SOCK);
+  bmp->client_index = vcm->my_client_index;
+  bmp->context = htonl (0xfeedface);
+  bmp->vrf = session->vrf;
+  bmp->is_ip4 = session->is_ip4;
+  clib_memcpy (bmp->ip, session->ip, (session->is_ip4 ?
+				      sizeof (ip4_address_t) :
+				      sizeof (ip6_address_t)));
+  bmp->port = session->port;
+  bmp->proto = session->proto;
+  clib_memcpy (bmp->options, session->options, sizeof (bmp->options));
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
+}
+
+static void
+vppcom_send_unbind_sock (u32 session_index)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vl_api_unbind_sock_t *ump;
+  session_t *session = 0;
+  int rv;
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, session_index);
+      return;
+    }
+
+  ump = vl_msg_api_alloc (sizeof (*ump));
+  memset (ump, 0, sizeof (*ump));
+
+  ump->_vl_msg_id = ntohs (VL_API_UNBIND_SOCK);
+  ump->client_index = vcm->my_client_index;
+  ump->handle = session->vpp_session_handle;
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & ump);
+}
+
+static int
+vppcom_session_unbind_cut_thru (session_t * session)
+{
+  svm_fifo_segment_main_t *sm = &svm_fifo_segment_main;
+  svm_fifo_segment_private_t *seg;
+  int rv = VPPCOM_OK;
+
+  seg = vec_elt_at_index (sm->segments, session->sm_seg_index);
+  svm_fifo_segment_free_fifo (seg, session->server_rx_fifo,
+			      FIFO_SEGMENT_RX_FREELIST);
+  svm_fifo_segment_free_fifo (seg, session->server_tx_fifo,
+			      FIFO_SEGMENT_TX_FREELIST);
+  svm_fifo_segment_delete (seg);
+
+  return rv;
+}
+
+static int
+vppcom_session_unbind (u32 session_index)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  int rv;
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  if (PREDICT_FALSE (pool_is_free_index (vcm->sessions, session_index)))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 1)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, session_index);
+      return VPPCOM_EBADFD;
+    }
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+
+  vcm->bind_session_index = session_index;
+  vppcom_send_unbind_sock (session_index);
+  rv = vppcom_wait_for_session_state_change (session_index, STATE_START,
+					     vcm->cfg.session_timeout);
+  if (PREDICT_FALSE (rv))
+    {
+      vcm->bind_session_index = ~0;
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] server unbind timed out, rv = %s (%d)",
+		      vcm->my_pid, vppcom_retval_str (rv), rv);
+      return rv;
+    }
+  return VPPCOM_OK;
+}
+
+static int
+vppcom_session_disconnect (u32 session_index)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  int rv;
+
+  rv = vppcom_send_disconnect (session_index);
+  if (PREDICT_FALSE (rv))
+    return rv;
+
+  rv = vppcom_wait_for_session_state_change (session_index, STATE_DISCONNECT,
+					     vcm->cfg.session_timeout);
+  if (PREDICT_FALSE (rv))
+    {
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] client disconnect timed out, rv = %s (%d)",
+		      vcm->my_pid, vppcom_retval_str (rv), rv);
+      return rv;
+    }
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  pool_put_index (vcm->sessions, session_index);
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+  return VPPCOM_OK;
+}
+
+#define foreach_sock_msg                                        \
+_(SESSION_ENABLE_DISABLE_REPLY, session_enable_disable_reply)   \
+_(BIND_SOCK_REPLY, bind_sock_reply)                             \
+_(UNBIND_SOCK_REPLY, unbind_sock_reply)                         \
+_(ACCEPT_SESSION, accept_session)                               \
+_(CONNECT_SOCK, connect_sock)                                   \
+_(CONNECT_SOCK_REPLY, connect_sock_reply)                       \
+_(DISCONNECT_SESSION, disconnect_session)                       \
+_(DISCONNECT_SESSION_REPLY, disconnect_session_reply)           \
+_(RESET_SESSION, reset_session)                                 \
+_(APPLICATION_ATTACH_REPLY, application_attach_reply)           \
+_(APPLICATION_DETACH_REPLY, application_detach_reply)           \
+_(MAP_ANOTHER_SEGMENT, map_another_segment)
+
+static void
+vppcom_api_hookup (void)
+{
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
+                           vl_api_##n##_t_handler,              \
+                           vl_noop_handler,                     \
+                           vl_api_##n##_t_endian,               \
+                           vl_api_##n##_t_print,                \
+                           sizeof(vl_api_##n##_t), 1);
+  foreach_sock_msg;
+#undef _
+}
+
+static void
+vppcom_cfg_init (vppcom_cfg_t * vcl_cfg)
+{
+  ASSERT (vcl_cfg);
+
+  vcl_cfg->heapsize = (256ULL << 20);
+  vcl_cfg->segment_baseva = 0x200000000ULL;
+  vcl_cfg->segment_size = (256 << 20);
+  vcl_cfg->add_segment_size = (128 << 20);
+  vcl_cfg->preallocated_fifo_pairs = 8;
+  vcl_cfg->rx_fifo_size = (1 << 20);
+  vcl_cfg->tx_fifo_size = (1 << 20);
+  vcl_cfg->event_queue_size = 2048;
+  vcl_cfg->listen_queue_size = CLIB_CACHE_LINE_BYTES / sizeof (u32);
+  vcl_cfg->app_timeout = 10 * 60.0;
+  vcl_cfg->session_timeout = 10 * 60.0;
+  vcl_cfg->accept_timeout = 60.0;
+}
+
+static void
+vppcom_cfg_heapsize (char *conf_fname)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vppcom_cfg_t *vcl_cfg = &vcm->cfg;
+  FILE *fp;
+  char inbuf[4096];
+  int argc = 1;
+  char **argv = NULL;
+  char *arg = NULL;
+  char *p;
+  int i;
+  u8 *sizep;
+  u32 size;
+
+  fp = fopen (conf_fname, "r");
+  if (fp == NULL)
+    {
+      if (VPPCOM_DEBUG > 0)
+	fprintf (stderr, "open configuration file '%s' failed\n", conf_fname);
+      goto defaulted;
+    }
+  argv = calloc (1, sizeof (char *));
+  if (argv == NULL)
+    goto defaulted;
+
+  while (1)
+    {
+      if (fgets (inbuf, 4096, fp) == 0)
+	break;
+      p = strtok (inbuf, " \t\n");
+      while (p != NULL)
+	{
+	  if (*p == '#')
+	    break;
+	  argc++;
+	  char **tmp = realloc (argv, argc * sizeof (char *));
+	  if (tmp == NULL)
+	    {
+	      fclose (fp);
+	      goto defaulted;
+	    }
+	  argv = tmp;
+	  arg = strndup (p, 1024);
+	  if (arg == NULL)
+	    {
+	      fclose (fp);
+	      goto defaulted;
+	    }
+	  argv[argc - 1] = arg;
+	  p = strtok (NULL, " \t\n");
+	}
+    }
+
+  fclose (fp);
+
+  char **tmp = realloc (argv, (argc + 1) * sizeof (char *));
+  if (tmp == NULL)
+    goto defaulted;
+  argv = tmp;
+  argv[argc] = NULL;
+
+  /*
+   * Look for and parse the "heapsize" config parameter.
+   * Manual since none of the clib infra has been bootstrapped yet.
+   *
+   * Format: heapsize <nn>[mM][gG]
+   */
+
+  for (i = 1; i < (argc - 1); i++)
+    {
+      if (!strncmp (argv[i], "heapsize", 8))
+	{
+	  sizep = (u8 *) argv[i + 1];
+	  size = 0;
+	  while (*sizep >= '0' && *sizep <= '9')
+	    {
+	      size *= 10;
+	      size += *sizep++ - '0';
+	    }
+	  if (size == 0)
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] parse error '%s %s', "
+			      "using default heapsize %lld (0x%llx)",
+			      vcm->my_pid, argv[i], argv[i + 1],
+			      vcl_cfg->heapsize, vcl_cfg->heapsize);
+	      goto defaulted;
+	    }
+
+	  if (*sizep == 'g' || *sizep == 'G')
+	    vcl_cfg->heapsize = size << 30;
+	  else if (*sizep == 'm' || *sizep == 'M')
+	    vcl_cfg->heapsize = size << 20;
+	  else
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] parse error '%s %s', "
+			      "using default heapsize %lld (0x%llx)",
+			      vcm->my_pid, argv[i], argv[i + 1],
+			      vcl_cfg->heapsize, vcl_cfg->heapsize);
+	      goto defaulted;
+	    }
+	}
+    }
+
+defaulted:
+  if (!clib_mem_init (0, vcl_cfg->heapsize))
+    clib_warning ("[%d] vppcom heap allocation failure!", vcm->my_pid);
+  else if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] allocated vppcom heapsize %lld (0x%llx)",
+		  vcm->my_pid, vcl_cfg->heapsize, vcl_cfg->heapsize);
+}
+
+static void
+vppcom_cfg_read (char *conf_fname)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vppcom_cfg_t *vcl_cfg = &vcm->cfg;
+  int fd;
+  unformat_input_t _input, *input = &_input;
+  unformat_input_t _line_input, *line_input = &_line_input;
+  u8 vc_cfg_input = 0;
+  u8 *chroot_path;
+  struct stat s;
+  u32 uid, gid;
+
+  fd = open (conf_fname, O_RDONLY);
+  if (fd < 0)
+    {
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] open configuration file '%s' failed!",
+		      vcm->my_pid, conf_fname);
+      goto file_done;
+    }
+
+  if (fstat (fd, &s) < 0)
+    {
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] failed to stat `%s'", vcm->my_pid, conf_fname);
+      goto file_done;
+    }
+
+  if (!(S_ISREG (s.st_mode) || S_ISLNK (s.st_mode)))
+    {
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] not a regular file `%s'", vcm->my_pid,
+		      conf_fname);
+      goto file_done;
+    }
+
+  unformat_init_unix_file (input, fd);
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      unformat_user (input, unformat_line_input, line_input);
+      unformat_skip_white_space (line_input);
+
+      if (unformat (line_input, "vppcom {"))
+	{
+	  vc_cfg_input = 1;
+	  continue;
+	}
+
+      if (vc_cfg_input)
+	{
+	  if (unformat (line_input, "heapsize %s", &chroot_path))
+	    {
+	      vec_terminate_c_string (chroot_path);
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured heapsize %s, "
+			      "actual heapsize %lld (0x%llx)",
+			      vcm->my_pid, chroot_path, vcl_cfg->heapsize,
+			      vcl_cfg->heapsize);
+	      vec_free (chroot_path);
+	    }
+	  else if (unformat (line_input, "api-prefix %s", &chroot_path))
+	    {
+	      vec_terminate_c_string (chroot_path);
+	      vl_set_memory_root_path ((char *) chroot_path);
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured api-prefix %s",
+			      vcm->my_pid, chroot_path);
+	      chroot_path = 0;	/* Don't vec_free() it! */
+	    }
+	  else if (unformat (line_input, "uid %d", &uid))
+	    {
+	      vl_set_memory_uid (uid);
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured uid %d", vcm->my_pid, uid);
+	    }
+	  else if (unformat (line_input, "gid %d", &gid))
+	    {
+	      vl_set_memory_gid (gid);
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured gid %d", vcm->my_pid, gid);
+	    }
+	  else if (unformat (line_input, "segment-baseva 0x%llx",
+			     &vcl_cfg->segment_baseva))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured segment_baseva 0x%llx",
+			      vcm->my_pid, vcl_cfg->segment_baseva);
+	    }
+	  else if (unformat (line_input, "segment-size 0x%lx",
+			     &vcl_cfg->segment_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured segment_size 0x%lx (%ld)",
+			      vcm->my_pid, vcl_cfg->segment_size,
+			      vcl_cfg->segment_size);
+	    }
+	  else if (unformat (line_input, "segment-size %ld",
+			     &vcl_cfg->segment_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured segment_size %ld (0x%lx)",
+			      vcm->my_pid, vcl_cfg->segment_size,
+			      vcl_cfg->segment_size);
+	    }
+	  else if (unformat (line_input, "add-segment-size 0x%lx",
+			     &vcl_cfg->add_segment_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning
+		  ("[%d] configured add_segment_size 0x%lx (%ld)",
+		   vcm->my_pid, vcl_cfg->add_segment_size,
+		   vcl_cfg->add_segment_size);
+	    }
+	  else if (unformat (line_input, "add-segment-size %ld",
+			     &vcl_cfg->add_segment_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning
+		  ("[%d] configured add_segment_size %ld (0x%lx)",
+		   vcm->my_pid, vcl_cfg->add_segment_size,
+		   vcl_cfg->add_segment_size);
+	    }
+	  else if (unformat (line_input, "preallocated-fifo-pairs %d",
+			     &vcl_cfg->preallocated_fifo_pairs))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured preallocated_fifo_pairs "
+			      "%d (0x%x)", vcm->my_pid,
+			      vcl_cfg->preallocated_fifo_pairs,
+			      vcl_cfg->preallocated_fifo_pairs);
+	    }
+	  else if (unformat (line_input, "rx-fifo-size 0x%lx",
+			     &vcl_cfg->rx_fifo_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured rx_fifo_size 0x%lx (%ld)",
+			      vcm->my_pid, vcl_cfg->rx_fifo_size,
+			      vcl_cfg->rx_fifo_size);
+	    }
+	  else if (unformat (line_input, "rx-fifo-size %ld",
+			     &vcl_cfg->rx_fifo_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured rx_fifo_size %ld (0x%lx)",
+			      vcm->my_pid, vcl_cfg->rx_fifo_size,
+			      vcl_cfg->rx_fifo_size);
+	    }
+	  else if (unformat (line_input, "tx-fifo-size 0x%lx",
+			     &vcl_cfg->tx_fifo_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured tx_fifo_size 0x%lx (%ld)",
+			      vcm->my_pid, vcl_cfg->tx_fifo_size,
+			      vcl_cfg->tx_fifo_size);
+	    }
+	  else if (unformat (line_input, "tx-fifo-size %ld",
+			     &vcl_cfg->tx_fifo_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured tx_fifo_size %ld (0x%lx)",
+			      vcm->my_pid, vcl_cfg->tx_fifo_size,
+			      vcl_cfg->tx_fifo_size);
+	    }
+	  else if (unformat (line_input, "event-queue-size 0x%lx",
+			     &vcl_cfg->event_queue_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured event_queue_size 0x%lx (%ld)",
+			      vcm->my_pid, vcl_cfg->event_queue_size,
+			      vcl_cfg->event_queue_size);
+	    }
+	  else if (unformat (line_input, "event-queue-size %ld",
+			     &vcl_cfg->event_queue_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured event_queue_size %ld (0x%lx)",
+			      vcm->my_pid, vcl_cfg->event_queue_size,
+			      vcl_cfg->event_queue_size);
+	    }
+	  else if (unformat (line_input, "listen-queue-size 0x%lx",
+			     &vcl_cfg->listen_queue_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured listen_queue_size 0x%lx (%ld)",
+			      vcm->my_pid, vcl_cfg->listen_queue_size,
+			      vcl_cfg->listen_queue_size);
+	    }
+	  else if (unformat (line_input, "listen-queue-size %ld",
+			     &vcl_cfg->listen_queue_size))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured listen_queue_size %ld (0x%lx)",
+			      vcm->my_pid, vcl_cfg->listen_queue_size,
+			      vcl_cfg->listen_queue_size);
+	    }
+	  else if (unformat (line_input, "app-timeout %f",
+			     &vcl_cfg->app_timeout))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured app_timeout %f",
+			      vcm->my_pid, vcl_cfg->app_timeout);
+	    }
+	  else if (unformat (line_input, "session-timeout %f",
+			     &vcl_cfg->session_timeout))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured session_timeout %f",
+			      vcm->my_pid, vcl_cfg->session_timeout);
+	    }
+	  else if (unformat (line_input, "accept-timeout %f",
+			     &vcl_cfg->accept_timeout))
+	    {
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] configured accept_timeout %f",
+			      vcm->my_pid, vcl_cfg->accept_timeout);
+	    }
+	  else if (unformat (line_input, "}"))
+	    {
+	      vc_cfg_input = 0;
+	      if (VPPCOM_DEBUG > 0)
+		clib_warning ("[%d] completed parsing vppcom config!",
+			      vcm->my_pid);
+	      goto input_done;
+	    }
+	  else
+	    {
+	      if (line_input->buffer[line_input->index] != '#')
+		{
+		  clib_warning ("[%d] Unknown vppcom config option: '%s'",
+				vcm->my_pid, (char *)
+				&line_input->buffer[line_input->index]);
+		}
+	    }
+	}
+    }
+
+input_done:
+  unformat_free (input);
+
+file_done:
+  if (fd > 0)
+    close (fd);
+}
+
+/*
+ * VPPCOM Public API functions
+ */
+int
+vppcom_app_create (char *app_name)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  vppcom_cfg_t *vcl_cfg = &vcm->cfg;
+  u8 *heap;
+  mheap_t *h;
+  int rv;
+
+  if (!vcm->init)
+    {
+      char *conf_fname;
+
+      vcm->init = 1;
+      vcm->my_pid = getpid ();
+      clib_fifo_validate (vcm->client_session_index_fifo,
+			  vcm->cfg.listen_queue_size);
+      vppcom_cfg_init (vcl_cfg);
+      conf_fname = getenv (VPPCOM_CONF_ENV);
+      if (!conf_fname)
+	{
+	  conf_fname = VPPCOM_CONF_DEFAULT;
+	  if (VPPCOM_DEBUG > 0)
+	    clib_warning ("[%d] getenv '%s' failed!", vcm->my_pid,
+			  VPPCOM_CONF_ENV);
+	}
+      vppcom_cfg_heapsize (conf_fname);
+      vppcom_cfg_read (conf_fname);
+      vcm->bind_session_index = ~0;
+      vcm->main_cpu = os_get_thread_index ();
+      heap = clib_mem_get_per_cpu_heap ();
+      h = mheap_header (heap);
+
+      /* make the main heap thread-safe */
+      h->flags |= MHEAP_FLAG_THREAD_SAFE;
+
+      vcm->session_index_by_vpp_handles = hash_create (0, sizeof (uword));
+
+      clib_time_init (&vcm->clib_time);
+      vppcom_init_error_string_table ();
+      svm_fifo_segment_init (vcl_cfg->segment_baseva,
+			     20 /* timeout in secs */ );
+      clib_spinlock_init (&vcm->sessions_lockp);
+      vppcom_api_hookup ();
+    }
+
+  if (vcm->my_client_index == ~0)
+    {
+      vcm->app_state = STATE_APP_START;
+      rv = vppcom_connect_to_vpp (app_name);
+      if (rv)
+	{
+	  clib_warning ("[%s] couldn't connect to VPP.", vcm->my_pid);
+	  return rv;
+	}
+
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] sending session enable", vcm->my_pid);
+
+      rv = vppcom_app_session_enable ();
+      if (rv)
+	{
+	  clib_warning ("[%d] vppcom_app_session_enable() failed!",
+			vcm->my_pid);
+	  return rv;
+	}
+
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] sending app attach", vcm->my_pid);
+
+      rv = vppcom_app_attach ();
+      if (rv)
+	{
+	  clib_warning ("[%d] vppcom_app_attach() failed!", vcm->my_pid);
+	  return rv;
+	}
+    }
+
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] app_name '%s', my_client_index %d (0x%x)",
+		  vcm->my_pid, app_name, vcm->my_client_index,
+		  vcm->my_client_index);
+
+  return VPPCOM_OK;
+}
+
+void
+vppcom_app_destroy (void)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  int rv;
+
+  if (vcm->my_client_index == ~0)
+    return;
+
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] detaching from VPP, my_client_index %d (0x%x)",
+		  vcm->my_pid, vcm->my_client_index, vcm->my_client_index);
+
+  vppcom_app_detach ();
+  rv = vppcom_wait_for_app_state_change (STATE_APP_ENABLED);
+  if (PREDICT_FALSE (rv))
+    {
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] application detach timed out, rv = %s (%d)",
+		      vcm->my_pid, vppcom_retval_str (rv), rv);
+    }
+  vl_client_disconnect_from_vlib ();
+  vcm->my_client_index = ~0;
+  vcm->app_state = STATE_APP_START;
+}
+
+int
+vppcom_session_create (u32 vrf, u8 proto, u8 is_nonblocking)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session;
+  u32 session_index;
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  pool_get (vcm->sessions, session);
+  session_index = session - vcm->sessions;
+
+  session->vrf = vrf;
+  session->proto = proto;
+  session->state = STATE_START;
+  session->is_nonblocking = is_nonblocking;
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] sid %d", vcm->my_pid, session_index);
+
+  return (int) session_index;
+}
+
+int
+vppcom_session_close (uint32_t session_index)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  int rv;
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, session_index);
+      return rv;
+    }
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] sid %d", vcm->my_pid, session_index);
+
+  if (session->is_cut_thru)
+    {
+      if (session->is_server)
+	rv = vppcom_session_unbind_cut_thru (session);
+    }
+  else
+    {
+      rv = (session->is_server) ?
+	vppcom_session_unbind (session_index) :
+	vppcom_session_disconnect (session_index);
+    }
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  pool_put_index (vcm->sessions, session_index);
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+  return rv;
+}
+
+int
+vppcom_session_bind (uint32_t session_index, vppcom_endpt_t * ep)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  int rv;
+
+  if (!ep || !ep->ip)
+    return VPPCOM_EINVAL;
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, session_index);
+      return rv;
+    }
+
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] sid %d", vcm->my_pid, session_index);
+
+  session->vrf = ep->vrf;
+  session->is_ip4 = ep->is_ip4;
+  memset (session->ip, 0, sizeof (*session->ip));
+  clib_memcpy (session->ip, ep->ip, (ep->is_ip4 ?
+				     sizeof (ip4_address_t) :
+				     sizeof (ip6_address_t)));
+  session->port = ep->port;
+
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+  return VPPCOM_OK;
+}
+
+int
+vppcom_session_listen (uint32_t session_index, uint32_t q_len)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  int rv;
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, session_index);
+      return rv;
+    }
+
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] sid %d", vcm->my_pid, session_index);
+
+  ASSERT (vcm->bind_session_index == ~0);
+  vcm->bind_session_index = session_index;
+  vppcom_send_bind_sock (session);
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+  rv = vppcom_wait_for_session_state_change (session_index, STATE_LISTEN,
+					     vcm->cfg.session_timeout);
+  if (PREDICT_FALSE (rv))
+    {
+      vcm->bind_session_index = ~0;
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] server listen timed out, rv = %d (%d)",
+		      vcm->my_pid, vppcom_retval_str (rv), rv);
+      return rv;
+    }
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, session_index);
+      return rv;
+    }
+  session->is_listen = 1;
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+  clib_fifo_validate (vcm->client_session_index_fifo, q_len);
+
+  return VPPCOM_OK;
+}
+
+int
+vppcom_session_accept (uint32_t listen_session_index, vppcom_endpt_t * ep,
+		       double wait_for_time)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  u32 client_session_index;
+  int rv;
+  f64 wait_for;
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (listen_session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, listen_session_index);
+      return rv;
+    }
+
+  if (session->state != STATE_LISTEN)
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] session not in listen state, state = %s",
+		      vcm->my_pid, vppcom_session_state_str (session->state));
+      return VPPCOM_EBADFD;
+    }
+  wait_for = session->is_nonblocking ? 0 :
+    (wait_for_time < 0) ? vcm->cfg.accept_timeout : wait_for_time;
+
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] sid %d, state %s (%d)", vcm->my_pid,
+		  listen_session_index,
+		  vppcom_session_state_str (session->state), session->state);
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+
+  while (1)
+    {
+      rv = vppcom_wait_for_client_session_index (wait_for);
+      if (rv)
+	{
+	  if ((VPPCOM_DEBUG > 0))
+	    clib_warning ("[%d] sid %d, accept timed out, rv = %s (%d)",
+			  vcm->my_pid, listen_session_index,
+			  vppcom_retval_str (rv), rv);
+	  if ((wait_for == 0) || (wait_for_time > 0))
+	    return rv;
+	}
+      else
+	break;
+    }
+
+  clib_fifo_sub1 (vcm->client_session_index_fifo, client_session_index);
+
+  session = 0;
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (client_session_index, &session);
+  ASSERT (rv == VPPCOM_OK);
+  ASSERT (session->is_server);
+
+  if (VPPCOM_DEBUG > 0)
+    clib_warning ("[%d] Got a request: client sid %d", vcm->my_pid,
+		  client_session_index);
+
+  ep->vrf = session->vrf;
+  ep->is_cut_thru = session->is_cut_thru;
+  ep->is_ip4 = session->is_ip4;
+  ep->port = session->port;
+  memset (ep->ip, 0, sizeof (ip6_address_t));
+  clib_memcpy (ep->ip, session->ip, (session->is_ip4 ?
+				     sizeof (ip4_address_t) :
+				     sizeof (ip6_address_t)));
+  session->state = STATE_LISTEN;
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+  return (int) client_session_index;
+}
+
+int
+vppcom_session_connect (uint32_t session_index, vppcom_endpt_t * server_ep)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  int rv;
+  ip46_address_t *ip46;
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, session_index);
+      return rv;
+    }
+
+  if (session->state == STATE_CONNECT)
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] session, sid (%d) already connected!",
+		      vcm->my_pid, session_index);
+      return VPPCOM_OK;
+    }
+
+  session->vrf = server_ep->vrf;
+  session->is_ip4 = server_ep->is_ip4;
+  ip46 = (ip46_address_t *) session->ip;
+  *ip46 = to_ip46 (!server_ep->is_ip4, server_ep->ip);
+  session->port = server_ep->port;
+
+  if (VPPCOM_DEBUG > 0)
+    {
+      u8 *ip_str = format (0, "%U", format_ip46_address,
+			   &session->ip, session->is_ip4);
+      clib_warning ("[%d] connect sid %d to %s server port %d",
+		    vcm->my_pid, session_index, ip_str,
+		    clib_net_to_host_u16 (session->port));
+      vec_free (ip_str);
+    }
+
+  vppcom_send_connect_sock (session, session_index);
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+  rv = vppcom_wait_for_session_state_change (session_index, STATE_CONNECT,
+					     vcm->cfg.session_timeout);
+  if (PREDICT_FALSE (rv))
+    {
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] connect timed out, rv = %s (%d)",
+		      vcm->my_pid, vppcom_retval_str (rv), rv);
+      return rv;
+    }
+  return VPPCOM_OK;
+}
+
+int
+vppcom_session_read (uint32_t session_index, void *buf, int n)
+{
+  session_fifo_event_t _e, *e = &_e;
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  svm_fifo_t *rx_fifo;
+  int n_read = 0;
+  int rv;
+  char *fifo_str;
+
+  ASSERT (buf);
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, session_index);
+      return rv;
+    }
+
+  if (session->is_cut_thru)
+    {
+      rx_fifo = session->is_server ? session->server_rx_fifo :
+	session->server_tx_fifo;
+      fifo_str = session->is_server ? "server_rx_fifo" : "server_tx_fifo";
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+
+      n_read = svm_fifo_dequeue_nowait (rx_fifo, n, buf);
+
+      if (n_read <= 0)
+	return VPPCOM_EAGAIN;
+
+    }
+  else
+    {
+      rv = unix_shared_memory_queue_sub (session->event_queue, (u8 *) e,
+					 1 /* nowait */ );
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (rv < 0)
+	return VPPCOM_EAGAIN;
+
+      switch (e->event_type)
+	{
+	case FIFO_EVENT_APP_RX:
+	  rx_fifo = e->fifo;
+	  fifo_str = "app_rx_fifo";
+	  n_read = svm_fifo_dequeue_nowait (rx_fifo, n, buf);
+	  break;
+
+	case FIFO_EVENT_DISCONNECT:
+	  return VPPCOM_ECONNRESET;
+
+	default:
+	  if (VPPCOM_DEBUG > 0)
+	    clib_warning ("[%d] unknown event type %d", vcm->my_pid,
+			  e->event_type);
+	  return VPPCOM_EAGAIN;
+	}
+    }
+
+  if (VPPCOM_DEBUG > 2)
+    clib_warning ("[%d] sid %d, read %d bytes from %s (%p)", vcm->my_pid,
+		  session_index, n_read, fifo_str, rx_fifo);
+  return n_read;
+}
+
+static inline int
+vppcom_session_read_ready (session_t * session, u32 session_index)
+{
+  session_fifo_event_t _e, *e = &_e;
+  vppcom_main_t *vcm = &vppcom_main;
+  svm_fifo_t *rx_fifo;
+  int rv;
+  int ready = 0;
+
+  /* Assumes caller has acquired spinlock: vcm->sessions_lockp */
+  if (session->is_cut_thru)
+    {
+      rx_fifo = session->is_server ? session->server_rx_fifo :
+	session->server_tx_fifo;
+
+      ready = svm_fifo_max_dequeue (rx_fifo);
+    }
+  else if (session->is_listen)
+    ready = clib_fifo_elts (vcm->client_session_index_fifo);
+  else
+    {
+      rv = unix_shared_memory_queue_sub (vcm->app_event_queue, (u8 *) e,
+					 1 /* nowait */ );
+      if (rv >= 0)
+	{
+	  switch (e->event_type)
+	    {
+	    case FIFO_EVENT_APP_RX:
+	      rx_fifo = e->fifo;
+	      ready = svm_fifo_max_dequeue (rx_fifo);
+	      break;
+
+	    case FIFO_EVENT_DISCONNECT:
+	      return VPPCOM_ECONNRESET;
+
+	    default:
+	      clib_warning ("[%d] unknown event type %d", vcm->my_pid,
+			    e->event_type);
+	    }
+	}
+    }
+
+  if (VPPCOM_DEBUG > 2)
+    clib_warning ("[%d] sid %d, peek %s (%p), ready = %d", vcm->my_pid,
+		  session_index,
+		  session->is_server ? "server_rx_fifo" : "server_tx_fifo",
+		  rx_fifo, ready);
+
+  return ready;
+}
+
+int
+vppcom_session_write (uint32_t session_index, void *buf, int n)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  session_t *session = 0;
+  svm_fifo_t *tx_fifo;
+  unix_shared_memory_queue_t *q;
+  session_fifo_event_t evt;
+  int rv;
+  char *fifo_str;
+  u8 is_nonblocking;
+
+  ASSERT (buf);
+
+  clib_spinlock_lock (&vcm->sessions_lockp);
+  rv = vppcom_session_at_index (session_index, &session);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      if (VPPCOM_DEBUG > 0)
+	clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+		      vcm->my_pid, session_index);
+      return rv;
+    }
+
+  tx_fifo = ((!session->is_cut_thru || session->is_server) ?
+	     session->server_tx_fifo : session->server_rx_fifo);
+  fifo_str = ((!session->is_cut_thru || session->is_server) ?
+	      "server_tx_fifo" : "server_rx_fifo");
+  is_nonblocking = session->is_nonblocking;
+  clib_spinlock_unlock (&vcm->sessions_lockp);
+
+  do
+    {
+      rv = svm_fifo_enqueue_nowait (tx_fifo, n, buf);
+    }
+  while (!is_nonblocking && (rv <= 0));
+
+  /* If event wasn't set, add one */
+  if ((rv > 0) && svm_fifo_set_event (tx_fifo))
+    {
+      int rval;
+
+      /* Fabricate TX event, send to vpp */
+      evt.fifo = tx_fifo;
+      evt.event_type = FIFO_EVENT_APP_TX;
+      evt.event_id = vcm->tx_event_id++;
+
+      clib_spinlock_lock (&vcm->sessions_lockp);
+      rval = vppcom_session_at_index (session_index, &session);
+      if (PREDICT_FALSE (rval))
+	{
+	  clib_spinlock_unlock (&vcm->sessions_lockp);
+	  if (VPPCOM_DEBUG > 1)
+	    clib_warning ("[%d] invalid session, sid (%d) has been closed!",
+			  vcm->my_pid, session_index);
+	  return rval;
+	}
+      q = session->event_queue;
+      clib_spinlock_unlock (&vcm->sessions_lockp);
+      ASSERT (q);
+      unix_shared_memory_queue_add (q, (u8 *) & evt,
+				    0 /* do wait for mutex */ );
+    }
+
+  if (VPPCOM_DEBUG > 2)
+    clib_warning ("[%d] sid %d, wrote %d bytes to %s (%p)", vcm->my_pid,
+		  session_index, rv, fifo_str, tx_fifo);
+
+  return rv;
+}
+
+static inline int
+vppcom_session_write_ready (session_t * session, u32 session_index)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  svm_fifo_t *tx_fifo;
+  int rv;
+
+  /* Assumes caller has acquired spinlock: vcm->sessions_lockp */
+  tx_fifo = ((!session->is_cut_thru || session->is_server) ?
+	     session->server_tx_fifo : session->server_rx_fifo);
+
+  rv = svm_fifo_max_enqueue (tx_fifo);
+
+  if (VPPCOM_DEBUG > 2)
+    clib_warning ("[%d] sid %d, peek %s (%p), ready = %d", vcm->my_pid,
+		  session_index,
+		  session->is_server ? "server_tx_fifo" : "server_rx_fifo",
+		  tx_fifo, rv);
+  return rv;
+}
+
+int
+vppcom_select (unsigned long n_bits, unsigned long *read_map,
+	       unsigned long *write_map, unsigned long *except_map,
+	       double time_to_wait)
+{
+  vppcom_main_t *vcm = &vppcom_main;
+  u32 session_index;
+  session_t *session = 0;
+  int rv, bits_set = 0;
+  f64 timeout = clib_time_now (&vcm->clib_time) + time_to_wait;
+  u32 minbits = clib_max (n_bits, BITS (uword));
+
+  ASSERT (sizeof (clib_bitmap_t) == sizeof (long int));
+
+  if (read_map)
+    {
+      clib_bitmap_validate (vcm->rd_bitmap, minbits);
+      clib_memcpy (vcm->rd_bitmap, read_map, vec_len (vcm->rd_bitmap));
+      memset (read_map, 0, vec_len (vcm->rd_bitmap));
+    }
+  if (write_map)
+    {
+      clib_bitmap_validate (vcm->wr_bitmap, minbits);
+      clib_memcpy (vcm->wr_bitmap, write_map, vec_len (vcm->wr_bitmap));
+      memset (write_map, 0, vec_len (vcm->wr_bitmap));
+    }
+  if (except_map)
+    {
+      clib_bitmap_validate (vcm->ex_bitmap, minbits);
+      clib_memcpy (vcm->ex_bitmap, except_map, vec_len (vcm->ex_bitmap));
+      memset (except_map, 0, vec_len (vcm->ex_bitmap));
+    }
+
+  do
+    {
+      /* *INDENT-OFF* */
+      clib_bitmap_foreach (session_index, vcm->rd_bitmap,
+        ({
+          clib_spinlock_lock (&vcm->sessions_lockp);
+          rv = vppcom_session_at_index (session_index, &session);
+          if (rv < 0)
+            {
+              clib_spinlock_unlock (&vcm->sessions_lockp);
+              if (VPPCOM_DEBUG > 1)
+                clib_warning ("[%d] session %d specified in "
+                              "read_map is closed.", vcm->my_pid,
+                              session_index);
+              bits_set = VPPCOM_EBADFD;
+              goto select_done;
+            }
+
+          rv = vppcom_session_read_ready (session, session_index);
+          clib_spinlock_unlock (&vcm->sessions_lockp);
+          if (vcm->ex_bitmap &&
+              clib_bitmap_get (vcm->ex_bitmap, session_index) && (rv < 0))
+            {
+              // TBD: clib_warning
+              clib_bitmap_set_no_check (except_map, session_index, 1);
+              bits_set++;
+            }
+          else if (rv > 0)
+            {
+              // TBD: clib_warning
+              clib_bitmap_set_no_check (read_map, session_index, 1);
+              bits_set++;
+            }
+        }));
+
+      clib_bitmap_foreach (session_index, vcm->wr_bitmap,
+        ({
+          clib_spinlock_lock (&vcm->sessions_lockp);
+          rv = vppcom_session_at_index (session_index, &session);
+          if (rv < 0)
+            {
+              clib_spinlock_unlock (&vcm->sessions_lockp);
+              if (VPPCOM_DEBUG > 0)
+                clib_warning ("[%d] session %d specified in "
+                              "write_map is closed.", vcm->my_pid,
+                              session_index);
+              bits_set = VPPCOM_EBADFD;
+              goto select_done;
+            }
+
+          rv = vppcom_session_write_ready (session, session_index);
+          clib_spinlock_unlock (&vcm->sessions_lockp);
+          if (rv > 0)
+            {
+              // TBD: clib_warning
+              clib_bitmap_set_no_check (write_map, session_index, 1);
+              bits_set++;
+            }
+        }));
+
+      clib_bitmap_foreach (session_index, vcm->ex_bitmap,
+        ({
+          clib_spinlock_lock (&vcm->sessions_lockp);
+          rv = vppcom_session_at_index (session_index, &session);
+          if (rv < 0)
+            {
+              clib_spinlock_unlock (&vcm->sessions_lockp);
+              if (VPPCOM_DEBUG > 1)
+                clib_warning ("[%d] session %d specified in "
+                              "except_map is closed.", vcm->my_pid,
+                              session_index);
+              bits_set = VPPCOM_EBADFD;
+              goto select_done;
+            }
+
+          rv = vppcom_session_read_ready (session, session_index);
+          clib_spinlock_unlock (&vcm->sessions_lockp);
+          if (rv < 0)
+            {
+              // TBD: clib_warning
+              clib_bitmap_set_no_check (except_map, session_index, 1);
+              bits_set++;
+            }
+        }));
+      /* *INDENT-ON* */
+    }
+  while (clib_time_now (&vcm->clib_time) < timeout);
+
+select_done:
+  return (bits_set);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/uri/vppcom.h b/src/uri/vppcom.h
new file mode 100644
index 00000000..4b048e03
--- /dev/null
+++ b/src/uri/vppcom.h
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef included_vppcom_h
+#define included_vppcom_h
+
+#include <netdb.h>
+#include <errno.h>
+
+/*
+ * VPPCOM Public API Definitions, Enums, and Data Structures
+ */
+#define INVALID_SESSION_ID   (~0)
+#define VPPCOM_VRF_DEFAULT   0
+#define VPPCOM_CONF_ENV      "VPPCOM_CONF"
+#define VPPCOM_CONF_DEFAULT  "/etc/vpp/vppcom.conf"
+
+typedef enum
+{
+  VPPCOM_PROTO_TCP = 0,
+  VPPCOM_PROTO_UDP,
+} vppcom_proto_t;
+
+typedef enum
+{
+  VPPCOM_IS_IP6 = 0,
+  VPPCOM_IS_IP4,
+} vppcom_is_ip4_t;
+
+typedef struct vppcom_endpt_t_
+{
+  uint32_t vrf;
+  uint8_t is_cut_thru;
+  uint8_t is_ip4;
+  uint8_t *ip;
+  uint16_t port;
+} vppcom_endpt_t;
+
+typedef enum
+{
+  VPPCOM_OK = 0,
+  VPPCOM_EAGAIN = -EAGAIN,
+  VPPCOM_EINVAL = -EINVAL,
+  VPPCOM_EBADFD = -EBADFD,
+  VPPCOM_EAFNOSUPPORT = -EAFNOSUPPORT,
+  VPPCOM_ECONNRESET = -ECONNRESET,
+  VPPCOM_ECONNREFUSED = -ECONNREFUSED,
+  VPPCOM_ETIMEDOUT = -ETIMEDOUT,
+} vppcom_error_t;
+
+/*
+ * VPPCOM Public API Functions
+ */
+static inline const char *
+vppcom_retval_str (int retval)
+{
+  char *st;
+
+  switch (retval)
+    {
+    case VPPCOM_OK:
+      st = "VPPCOM_OK";
+      break;
+
+    case VPPCOM_EAGAIN:
+      st = "VPPCOM_EAGAIN";
+      break;
+
+    case VPPCOM_EINVAL:
+      st = "VPPCOM_EINVAL";
+      break;
+
+    case VPPCOM_EBADFD:
+      st = "VPPCOM_EBADFD";
+      break;
+
+    case VPPCOM_EAFNOSUPPORT:
+      st = "VPPCOM_EAFNOSUPPORT";
+      break;
+
+    case VPPCOM_ECONNRESET:
+      st = "VPPCOM_ECONNRESET";
+      break;
+
+    case VPPCOM_ECONNREFUSED:
+      st = "VPPCOM_ECONNREFUSED";
+      break;
+
+    case VPPCOM_ETIMEDOUT:
+      st = "VPPCOM_ETIMEDOUT";
+      break;
+
+    default:
+      st = "UNKNOWN_STATE";
+      break;
+    }
+
+  return st;
+}
+
+static inline int
+is_vcom_fd (int fd)
+{
+#define VPPCOM_FD_OFFSET (1 << 30)
+  return (fd >= VPPCOM_FD_OFFSET);
+}
+
+/* TBD: make these constructor/destructor function */
+extern int vppcom_app_create (char *app_name);
+extern void vppcom_app_destroy (void);
+
+extern int vppcom_session_create (uint32_t vrf, uint8_t proto,
+				  uint8_t is_nonblocking);
+extern int vppcom_session_close (uint32_t session_index);
+
+extern int vppcom_session_bind (uint32_t session_index, vppcom_endpt_t * ep);
+extern int vppcom_session_listen (uint32_t session_index, uint32_t q_len);
+extern int vppcom_session_accept (uint32_t session_index,
+				  vppcom_endpt_t * client_ep,
+				  double wait_for_time);
+
+extern int vppcom_session_connect (uint32_t session_index,
+				   vppcom_endpt_t * server_ep);
+extern int vppcom_session_read (uint32_t session_index, void *buf, int n);
+extern int vppcom_session_write (uint32_t session_index, void *buf, int n);
+
+extern int vppcom_select (unsigned long n_bits,
+			  unsigned long *read_map,
+			  unsigned long *write_map,
+			  unsigned long *except_map, double wait_for_time);
+
+#endif /* included_vppcom_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/uri/vppcom_test.conf b/src/uri/vppcom_test.conf
new file mode 100644
index 00000000..e5ac4636
--- /dev/null
+++ b/src/uri/vppcom_test.conf
@@ -0,0 +1,25 @@
+# Test VPPCOM config file
+vppcom {
+  heapsize 1
+  api-prefix daw  # this is a comment
+  uid 1020 this is also a comment.
+  gid 1020
+# This is yet another comment!
+  segment-baseva 0x300000000
+  segment-size 0x10000000
+  segment-size 268435456
+  add-segment-size 0x1000000
+  add-segment-size 134217728
+  preallocated-fifo-pairs 16
+  rx-fifo-size 3145728
+  rx-fifo-size 0x300000
+  tx-fifo-size 3145728
+  tx-fifo-size 0x300000
+  event-queue-size 1024
+  event-queue-size 0x400
+  listen-queue-size 32
+  listen-queue-size 0x20
+  app-timeout 54.3
+  session-timeout 66.6
+  accept-timeout 0.1
+}