/*
 * Copyright (c) 2019 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 <stdio.h>
#include <signal.h>

#include <hs_apps/sapi/vpp_echo_common.h>

/*
 *
 *  Binary API Messages
 *
 */

void
echo_send_attach (echo_main_t * em)
{
  vl_api_application_attach_t *bmp;
  vl_api_application_tls_cert_add_t *cert_mp;
  vl_api_application_tls_key_add_t *key_mp;

  bmp = vl_msg_api_alloc (sizeof (*bmp));
  clib_memset (bmp, 0, sizeof (*bmp));

  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_ATTACH);
  bmp->client_index = em->my_client_index;
  bmp->context = ntohl (0xfeedface);
  bmp->options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_ACCEPT_REDIRECT;
  bmp->options[APP_OPTIONS_FLAGS] |= APP_OPTIONS_FLAGS_ADD_SEGMENT;
  bmp->options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] = 16;
  bmp->options[APP_OPTIONS_RX_FIFO_SIZE] = em->fifo_size;
  bmp->options[APP_OPTIONS_TX_FIFO_SIZE] = em->fifo_size;
  bmp->options[APP_OPTIONS_ADD_SEGMENT_SIZE] = 128 << 20;
  bmp->options[APP_OPTIONS_SEGMENT_SIZE] = 256 << 20;
  bmp->options[APP_OPTIONS_EVT_QUEUE_SIZE] = em->evt_q_size;
  if (em->appns_id)
    {
      bmp->namespace_id_len = vec_len (em->appns_id);
      clib_memcpy_fast (bmp->namespace_id, em->appns_id,
			bmp->namespace_id_len);
      bmp->options[APP_OPTIONS_FLAGS] |= em->appns_flags;
      bmp->options[APP_OPTIONS_NAMESPACE_SECRET] = em->appns_secret;
    }
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);

  cert_mp = vl_msg_api_alloc (sizeof (*cert_mp) + test_srv_crt_rsa_len);
  clib_memset (cert_mp, 0, sizeof (*cert_mp));
  cert_mp->_vl_msg_id = ntohs (VL_API_APPLICATION_TLS_CERT_ADD);
  cert_mp->client_index = em->my_client_index;
  cert_mp->context = ntohl (0xfeedface);
  cert_mp->cert_len = clib_host_to_net_u16 (test_srv_crt_rsa_len);
  clib_memcpy_fast (cert_mp->cert, test_srv_crt_rsa, test_srv_crt_rsa_len);
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & cert_mp);

  key_mp = vl_msg_api_alloc (sizeof (*key_mp) + test_srv_key_rsa_len);
  clib_memset (key_mp, 0, sizeof (*key_mp) + test_srv_key_rsa_len);
  key_mp->_vl_msg_id = ntohs (VL_API_APPLICATION_TLS_KEY_ADD);
  key_mp->client_index = em->my_client_index;
  key_mp->context = ntohl (0xfeedface);
  key_mp->key_len = clib_host_to_net_u16 (test_srv_key_rsa_len);
  clib_memcpy_fast (key_mp->key, test_srv_key_rsa, test_srv_key_rsa_len);
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & key_mp);
}

void
echo_send_detach (echo_main_t * em)
{
  vl_api_application_detach_t *bmp;
  bmp = vl_msg_api_alloc (sizeof (*bmp));
  clib_memset (bmp, 0, sizeof (*bmp));

  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_DETACH);
  bmp->client_index = em->my_client_index;
  bmp->context = ntohl (0xfeedface);
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);
}

void
echo_send_listen (echo_main_t * em)
{
  vl_api_bind_uri_t *bmp;
  bmp = vl_msg_api_alloc (sizeof (*bmp));
  clib_memset (bmp, 0, sizeof (*bmp));

  bmp->_vl_msg_id = ntohs (VL_API_BIND_URI);
  bmp->client_index = em->my_client_index;
  bmp->context = ntohl (0xfeedface);
  memcpy (bmp->uri, em->uri, vec_len (em->uri));
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);
}

void
echo_send_unbind (echo_main_t * em)
{
  vl_api_unbind_uri_t *ump;

  ump = vl_msg_api_alloc (sizeof (*ump));
  clib_memset (ump, 0, sizeof (*ump));

  ump->_vl_msg_id = ntohs (VL_API_UNBIND_URI);
  ump->client_index = em->my_client_index;
  memcpy (ump->uri, em->uri, vec_len (em->uri));
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & ump);
}

void
echo_send_connect (u8 * uri, u32 opaque)
{
  echo_main_t *em = &echo_main;
  vl_api_connect_uri_t *cmp;
  cmp = vl_msg_api_alloc (sizeof (*cmp));
  clib_memset (cmp, 0, sizeof (*cmp));
  cmp->_vl_msg_id = ntohs (VL_API_CONNECT_URI);
  cmp->client_index = em->my_client_index;
  cmp->context = ntohl (opaque);
  memcpy (cmp->uri, uri, vec_len (uri));
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & cmp);
}

void
echo_send_disconnect_session (u64 handle, u32 opaque)
{
  echo_main_t *em = &echo_main;
  vl_api_disconnect_session_t *dmp;
  dmp = vl_msg_api_alloc (sizeof (*dmp));
  clib_memset (dmp, 0, sizeof (*dmp));
  dmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION);
  dmp->client_index = em->my_client_index;
  dmp->handle = handle;
  ECHO_LOG (1, "Disconnect session 0x%lx", dmp->handle);
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & dmp);
}

/*
 *
 *  Helpers
 *
 */

static int
ssvm_segment_attach (char *name, ssvm_segment_type_t type, int fd)
{
  fifo_segment_create_args_t _a, *a = &_a;
  fifo_segment_main_t *sm = &echo_main.segment_main;
  int rv;

  clib_memset (a, 0, sizeof (*a));
  a->segment_name = (char *) name;
  a->segment_type = type;

  if (type == SSVM_SEGMENT_MEMFD)
    a->memfd_fd = fd;

  if ((rv = fifo_segment_attach (sm, a)))
    return rv;
  vec_reset_length (a->new_segment_indices);
  return 0;
}

static inline void
echo_segment_handle_add_del (echo_main_t * em, u64 segment_handle, u8 add)
{
  clib_spinlock_lock (&em->segment_handles_lock);
  if (add)
    hash_set (em->shared_segment_handles, segment_handle, 1);
  else
    hash_unset (em->shared_segment_handles, segment_handle);
  clib_spinlock_unlock (&em->segment_handles_lock);
}

/*
 *
 *  Binary API callbacks
 *
 */

static void
vl_api_application_attach_reply_t_handler (vl_api_application_attach_reply_t *
					   mp)
{
  echo_main_t *em = &echo_main;
  int *fds = 0, i;
  u32 n_fds = 0;
  u64 segment_handle;
  segment_handle = clib_net_to_host_u64 (mp->segment_handle);
  ECHO_LOG (1, "Attached returned app %u", htons (mp->app_index));

  if (mp->retval)
    {
      ECHO_FAIL (ECHO_FAIL_VL_API_APP_ATTACH, "attach failed: %U",
		 format_api_error, clib_net_to_host_u32 (mp->retval));
      return;
    }

  if (mp->segment_name_length == 0)
    {
      ECHO_FAIL (ECHO_FAIL_VL_API_MISSING_SEGMENT_NAME,
		 "segment_name_length zero");
      return;
    }

  ASSERT (mp->app_event_queue_address);
  em->our_event_queue = uword_to_pointer (mp->app_event_queue_address,
					  svm_msg_q_t *);

  if (mp->n_fds)
    {
      vec_validate (fds, mp->n_fds);
      if (vl_socket_client_recv_fd_msg (fds, mp->n_fds, 5))
	{
	  ECHO_FAIL (ECHO_FAIL_VL_API_RECV_FD_MSG,
		     "vl_socket_client_recv_fd_msg failed");
	  goto failed;
	}

      if (mp->fd_flags & SESSION_FD_F_VPP_MQ_SEGMENT)
	if (ssvm_segment_attach (0, SSVM_SEGMENT_MEMFD, fds[n_fds++]))
	  {
	    ECHO_FAIL (ECHO_FAIL_VL_API_SVM_FIFO_SEG_ATTACH,
		       "svm_fifo_segment_attach failed on SSVM_SEGMENT_MEMFD");
	    goto failed;
	  }

      if (mp->fd_flags & SESSION_FD_F_MEMFD_SEGMENT)
	if (ssvm_segment_attach ((char *) mp->segment_name,
				 SSVM_SEGMENT_MEMFD, fds[n_fds++]))
	  {
	    ECHO_FAIL (ECHO_FAIL_VL_API_SVM_FIFO_SEG_ATTACH,
		       "svm_fifo_segment_attach ('%s') "
		       "failed on SSVM_SEGMENT_MEMFD", mp->segment_name);
	    goto failed;
	  }
      if (mp->fd_flags & SESSION_FD_F_MQ_EVENTFD)
	svm_msg_q_set_consumer_eventfd (em->our_event_queue, fds[n_fds++]);

      vec_free (fds);
    }
  else
    {
      if (ssvm_segment_attach ((char *) mp->segment_name, SSVM_SEGMENT_SHM,
			       -1))
	{
	  ECHO_FAIL (ECHO_FAIL_VL_API_SVM_FIFO_SEG_ATTACH,
		     "svm_fifo_segment_attach ('%s') "
		     "failed on SSVM_SEGMENT_SHM", mp->segment_name);
	  return;
	}
    }
  echo_segment_handle_add_del (em, segment_handle, 1 /* add */ );
  ECHO_LOG (1, "Mapped segment 0x%lx", segment_handle);

  em->state = STATE_ATTACHED;
  return;
failed:
  for (i = clib_max (n_fds - 1, 0); i < vec_len (fds); i++)
    close (fds[i]);
  vec_free (fds);
}

static void
vl_api_application_detach_reply_t_handler (vl_api_application_detach_reply_t *
					   mp)
{
  if (mp->retval)
    {
      ECHO_FAIL (ECHO_FAIL_VL_API_DETACH_REPLY,
		 "app detach returned with err: %d", mp->retval);
      return;
    }
  echo_main.state = STATE_DETACHED;
}


static void
vl_api_unmap_segment_t_handler (vl_api_unmap_segment_t * mp)
{
  echo_main_t *em = &echo_main;
  u64 segment_handle = clib_net_to_host_u64 (mp->segment_handle);
  echo_segment_handle_add_del (em, segment_handle, 0 /* add */ );
  ECHO_LOG (1, "Unmaped segment 0x%lx", segment_handle);
}

static void
vl_api_map_another_segment_t_handler (vl_api_map_another_segment_t * mp)
{
  fifo_segment_main_t *sm = &echo_main.segment_main;
  fifo_segment_create_args_t _a, *a = &_a;
  echo_main_t *em = &echo_main;
  int *fds = 0, i;
  char *seg_name = (char *) mp->segment_name;
  u64 segment_handle = clib_net_to_host_u64 (mp->segment_handle);

  if (mp->fd_flags & SESSION_FD_F_MEMFD_SEGMENT)
    {
      vec_validate (fds, 1);
      if (vl_socket_client_recv_fd_msg (fds, 1, 5))
	{
	  ECHO_FAIL (ECHO_FAIL_VL_API_RECV_FD_MSG,
		     "vl_socket_client_recv_fd_msg failed");
	  goto failed;
	}

      if (ssvm_segment_attach (seg_name, SSVM_SEGMENT_MEMFD, fds[0]))
	{
	  ECHO_FAIL (ECHO_FAIL_VL_API_SVM_FIFO_SEG_ATTACH,
		     "svm_fifo_segment_attach ('%s') "
		     "failed on SSVM_SEGMENT_MEMFD", seg_name);
	  goto failed;
	}
      vec_free (fds);
    }
  else
    {
      clib_memset (a, 0, sizeof (*a));
      a->segment_name = seg_name;
      a->segment_size = mp->segment_size;
      /* Attach to the segment vpp created */
      if (fifo_segment_attach (sm, a))
	{
	  ECHO_FAIL (ECHO_FAIL_VL_API_FIFO_SEG_ATTACH,
		     "fifo_segment_attach ('%s') failed", seg_name);
	  goto failed;
	}
    }
  echo_segment_handle_add_del (em, segment_handle, 1 /* add */ );
  ECHO_LOG (1, "Mapped segment 0x%lx", segment_handle);
  return;

failed:
  for (i = 0; i < vec_len (fds); i++)
    close (fds[i]);
  vec_free (fds);
}

static void
vl_api_bind_uri_reply_t_handler (vl_api_bind_uri_reply_t * mp)
{
  if (mp->retval)
    {
      ECHO_FAIL (ECHO_FAIL_VL_API_BIND_URI_REPLY, "bind failed: %U",
		 format_api_error, clib_net_to_host_u32 (mp->retval));
    }
}

static void
vl_api_unbind_uri_reply_t_handler (vl_api_unbind_uri_reply_t * mp)
{
  echo_session_t *listen_session;
  echo_main_t *em = &echo_main;
  if (mp->retval != 0)
    {
      ECHO_FAIL (ECHO_FAIL_VL_API_UNBIND_REPLY, "unbind_uri returned %d",
		 ntohl (mp->retval));
      return;
    }
  listen_session = pool_elt_at_index (em->sessions, em->listen_session_index);
  em->proto_cb_vft->cleanup_cb (listen_session, 0 /* parent_died */ );
  em->state = STATE_DISCONNECTED;
}

static void
vl_api_disconnect_session_reply_t_handler (vl_api_disconnect_session_reply_t *
					   mp)
{
  echo_main_t *em = &echo_main;
  echo_session_t *s;

  if (mp->retval)
    {
      ECHO_FAIL (ECHO_FAIL_VL_API_DISCONNECT_SESSION_REPLY,
		 "vpp complained about disconnect: %d", ntohl (mp->retval));
      return;
    }

  ECHO_LOG (1, "Got disonnected reply for session 0x%lx", mp->handle);
  if (!(s = echo_get_session_from_handle (em, mp->handle)))
    return;
  em->proto_cb_vft->disconnected_reply_cb (s);
}

static void
  vl_api_application_tls_cert_add_reply_t_handler
  (vl_api_application_tls_cert_add_reply_t * mp)
{
  if (mp->retval)
    ECHO_FAIL (ECHO_FAIL_VL_API_TLS_CERT_ADD_REPLY,
	       "failed to add application tls cert");
}

static void
  vl_api_application_tls_key_add_reply_t_handler
  (vl_api_application_tls_key_add_reply_t * mp)
{
  if (mp->retval)
    ECHO_FAIL (ECHO_FAIL_VL_API_TLS_KEY_ADD_REPLY,
	       "failed to add application tls key");
}

static void
vl_api_connect_uri_reply_t_handler (vl_api_connect_uri_reply_t * mp)
{
  echo_main_t *em = &echo_main;
  if (mp->retval && (em->proto_cb_vft->connected_cb))
    em->proto_cb_vft->connected_cb ((session_connected_bundled_msg_t *) mp,
				    mp->context, 1 /* is_failed */ );
}

#define foreach_quic_echo_msg                                           \
_(BIND_URI_REPLY, bind_uri_reply)                                       \
_(UNBIND_URI_REPLY, unbind_uri_reply)                                   \
_(DISCONNECT_SESSION_REPLY, disconnect_session_reply)                   \
_(APPLICATION_ATTACH_REPLY, application_attach_reply)                   \
_(APPLICATION_DETACH_REPLY, application_detach_reply)                   \
_(MAP_ANOTHER_SEGMENT, map_another_segment)                             \
_(UNMAP_SEGMENT, unmap_segment)                                         \
_(APPLICATION_TLS_CERT_ADD_REPLY, application_tls_cert_add_reply)       \
_(APPLICATION_TLS_KEY_ADD_REPLY, application_tls_key_add_reply)         \
_(CONNECT_URI_REPLY, connect_uri_reply)         \

void
echo_api_hookup (echo_main_t * em)
{
#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_quic_echo_msg;
#undef _
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */