/*
 * Copyright (c) 2015 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.
 */
/*
 * pg_cli.c: packet generator cli
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <sys/stat.h>

#include <vnet/vnet.h>
#include <vnet/pg/pg.h>

#include <strings.h>
#include <vppinfra/pcap.h>


/* Root of all packet generator cli commands. */
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (vlib_cli_pg_command, static) = {
  .path = "packet-generator",
  .short_help = "Packet generator commands",
};
/* *INDENT-ON* */

void
pg_enable_disable (u32 stream_index, int is_enable)
{
  pg_main_t *pg = &pg_main;
  pg_stream_t *s;

  if (stream_index == ~0)
    {
      /* No stream specified: enable/disable all streams. */
      /* *INDENT-OFF* */
        pool_foreach (s, pg->streams, ({
            pg_stream_enable_disable (pg, s, is_enable);
        }));
	/* *INDENT-ON* */
    }
  else
    {
      /* enable/disable specified stream. */
      s = pool_elt_at_index (pg->streams, stream_index);
      pg_stream_enable_disable (pg, s, is_enable);
    }
}

clib_error_t *
pg_capture (pg_capture_args_t * a)
{
  pg_main_t *pg = &pg_main;
  pg_interface_t *pi;

  if (a->is_enabled == 1)
    {
      struct stat sb;
      if (stat (a->pcap_file_name, &sb) != -1)
	return clib_error_return (0, "pcap file '%s' already exists.",
				  a->pcap_file_name);
    }

  pi = pool_elt_at_index (pg->interfaces, a->dev_instance);
  vec_free (pi->pcap_file_name);
  if ((pi->pcap_main.flags & PCAP_MAIN_INIT_DONE))
    pcap_close (&pi->pcap_main);
  clib_memset (&pi->pcap_main, 0, sizeof (pi->pcap_main));
  pi->pcap_main.file_descriptor = -1;

  if (a->is_enabled == 0)
    return 0;

  pi->pcap_file_name = a->pcap_file_name;
  pi->pcap_main.file_name = (char *) pi->pcap_file_name;
  pi->pcap_main.n_packets_to_capture = a->count;
  pi->pcap_main.packet_type = PCAP_PACKET_TYPE_ethernet;

  return 0;
}

static clib_error_t *
enable_disable_stream (vlib_main_t * vm,
		       unformat_input_t * input, vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  pg_main_t *pg = &pg_main;
  int is_enable = cmd->function_arg != 0;
  u32 stream_index = ~0;

  if (!unformat_user (input, unformat_line_input, line_input))
    goto doit;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U", unformat_hash_vec_string,
		    pg->stream_index_by_name, &stream_index))
	;
      else
	return clib_error_create ("unknown input `%U'",
				  format_unformat_error, line_input);
    }
  unformat_free (line_input);

doit:
  pg_enable_disable (stream_index, is_enable);

  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (enable_streams_cli, static) = {
  .path = "packet-generator enable-stream",
  .short_help = "Enable packet generator streams",
  .function = enable_disable_stream,
  .function_arg = 1,		/* is_enable */
};
/* *INDENT-ON* */

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (disable_streams_cli, static) = {
  .path = "packet-generator disable-stream",
  .short_help = "Disable packet generator streams",
  .function = enable_disable_stream,
  .function_arg = 0,		/* is_enable */
};
/* *INDENT-ON* */

static u8 *
format_pg_edit_group (u8 * s, va_list * va)
{
  pg_edit_group_t *g = va_arg (*va, pg_edit_group_t *);

  s =
    format (s, "hdr-size %d, offset %d, ", g->n_packet_bytes,
	    g->start_byte_offset);
  if (g->edit_function)
    {
      u8 *function_name;
      u8 *junk_after_name;
      function_name = format (0, "%U%c", format_clib_elf_symbol_with_address,
			      g->edit_function, 0);
      junk_after_name = function_name;
      while (*junk_after_name && *junk_after_name != ' ')
	junk_after_name++;
      *junk_after_name = 0;
      s = format (s, "edit-function %s, ", function_name);
      vec_free (function_name);
    }

  return s;
}

static u8 *
format_pg_stream (u8 * s, va_list * va)
{
  pg_stream_t *t = va_arg (*va, pg_stream_t *);
  int verbose = va_arg (*va, int);

  if (!t)
    return format (s, "%-16s%=12s%=16s%s",
		   "Name", "Enabled", "Count", "Parameters");

  s = format (s, "%-16v%=12s%=16Ld",
	      t->name,
	      pg_stream_is_enabled (t) ? "Yes" : "No",
	      t->n_packets_generated);

  int indent = format_get_indent (s);

  s = format (s, "limit %Ld, ", t->n_packets_limit);
  s = format (s, "rate %.2e pps, ", t->rate_packets_per_second);
  s = format (s, "size %d%c%d, ",
	      t->min_packet_bytes,
	      t->packet_size_edit_type == PG_EDIT_RANDOM ? '+' : '-',
	      t->max_packet_bytes);
  s = format (s, "buffer-size %d, ", t->buffer_bytes);
  s = format (s, "worker %d, ", t->worker_index);

  if (verbose)
    {
      pg_edit_group_t *g;
  /* *INDENT-OFF* */
  vec_foreach (g, t->edit_groups)
    {
      s = format (s, "\n%U%U", format_white_space, indent, format_pg_edit_group, g);
    }
  /* *INDENT-ON* */
    }

  return s;
}

static clib_error_t *
show_streams (vlib_main_t * vm,
	      unformat_input_t * input, vlib_cli_command_t * cmd)
{
  pg_main_t *pg = &pg_main;
  pg_stream_t *s;
  int verbose = 0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "verbose"))
	verbose = 1;
      else
	break;
    }

  if (pool_elts (pg->streams) == 0)
    {
      vlib_cli_output (vm, "no streams currently defined");
      goto done;
    }

  vlib_cli_output (vm, "%U", format_pg_stream, 0, 0);
  /* *INDENT-OFF* */
  pool_foreach (s, pg->streams, ({
      vlib_cli_output (vm, "%U", format_pg_stream, s, verbose);
    }));
  /* *INDENT-ON* */

done:
  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_streams_cli, static) = {
  .path = "show packet-generator ",
  .short_help = "show packet-generator [verbose]",
  .function = show_streams,
};
/* *INDENT-ON* */

static clib_error_t *
pg_pcap_read (pg_stream_t * s, char *file_name)
{
#ifndef CLIB_UNIX
  return clib_error_return (0, "no pcap support");
#else
  pcap_main_t pm;
  clib_error_t *error;
  clib_memset (&pm, 0, sizeof (pm));
  pm.file_name = file_name;
  error = pcap_read (&pm);
  s->replay_packet_templates = pm.packets_read;
  s->replay_packet_timestamps = pm.timestamps;
  s->min_packet_bytes = pm.min_packet_bytes;
  s->max_packet_bytes = pm.max_packet_bytes;
  s->buffer_bytes = pm.max_packet_bytes;

  if (s->n_packets_limit == 0)
    s->n_packets_limit = vec_len (pm.packets_read);

  return error;
#endif /* CLIB_UNIX */
}

static uword
unformat_pg_stream_parameter (unformat_input_t * input, va_list * args)
{
  pg_stream_t *s = va_arg (*args, pg_stream_t *);
  f64 x;

  if (unformat (input, "limit %f", &x))
    s->n_packets_limit = x;

  else if (unformat (input, "rate %f", &x))
    s->rate_packets_per_second = x;

  else if (unformat (input, "size %d-%d", &s->min_packet_bytes,
		     &s->max_packet_bytes))
    s->packet_size_edit_type = PG_EDIT_INCREMENT;

  else if (unformat (input, "size %d+%d", &s->min_packet_bytes,
		     &s->max_packet_bytes))
    s->packet_size_edit_type = PG_EDIT_RANDOM;

  else if (unformat (input, "buffer-size %d", &s->buffer_bytes))
    ;

  else
    return 0;

  return 1;
}

static clib_error_t *
validate_stream (pg_stream_t * s)
{
  if (s->max_packet_bytes < s->min_packet_bytes)
    return clib_error_create ("max-size < min-size");

  u32 hdr_size = pg_edit_group_n_bytes (s, 0);
  if (s->min_packet_bytes < hdr_size)
    return clib_error_create ("min-size < total header size %d", hdr_size);
  if (s->buffer_bytes == 0)
    return clib_error_create ("buffer-size must be positive");

  if (s->rate_packets_per_second < 0)
    return clib_error_create ("negative rate");

  return 0;
}

static clib_error_t *
new_stream (vlib_main_t * vm,
	    unformat_input_t * input, vlib_cli_command_t * cmd)
{
  clib_error_t *error = 0;
  u8 *tmp = 0;
  u32 maxframe, hw_if_index;
  unformat_input_t sub_input = { 0 };
  int sub_input_given = 0;
  vnet_main_t *vnm = vnet_get_main ();
  pg_main_t *pg = &pg_main;
  pg_stream_t s = { 0 };
  char *pcap_file_name;

  s.sw_if_index[VLIB_RX] = s.sw_if_index[VLIB_TX] = ~0;
  s.node_index = ~0;
  s.max_packet_bytes = s.min_packet_bytes = 64;
  s.buffer_bytes = vlib_buffer_get_default_data_size (vm);
  s.if_id = 0;
  s.n_max_frame = VLIB_FRAME_SIZE;
  pcap_file_name = 0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "name %v", &tmp))
	{
	  if (s.name)
	    vec_free (s.name);
	  s.name = tmp;
	}

      else if (unformat (input, "node %U",
			 unformat_vnet_hw_interface, vnm, &hw_if_index))
	{
	  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);

	  s.node_index = hi->output_node_index;
	  s.sw_if_index[VLIB_TX] = hi->sw_if_index;
	}

      else if (unformat (input, "source pg%u", &s.if_id))
	;

      else if (unformat (input, "buffer-flags %U",
			 unformat_vnet_buffer_flags, &s.buffer_flags))
	;

      else if (unformat (input, "node %U",
			 unformat_vlib_node, vm, &s.node_index))
	;
      else if (unformat (input, "maxframe %u", &maxframe))
	s.n_max_frame = s.n_max_frame < maxframe ? s.n_max_frame : maxframe;
      else if (unformat (input, "worker %u", &s.worker_index))
	;

      else if (unformat (input, "interface %U",
			 unformat_vnet_sw_interface, vnm,
			 &s.sw_if_index[VLIB_RX]))
	;
      else if (unformat (input, "tx-interface %U",
			 unformat_vnet_sw_interface, vnm,
			 &s.sw_if_index[VLIB_TX]))
	;

      else if (unformat (input, "pcap %s", &pcap_file_name))
	;

      else if (!sub_input_given
	       && unformat (input, "data %U", unformat_input, &sub_input))
	sub_input_given++;

      else if (unformat_user (input, unformat_pg_stream_parameter, &s))
	;

      else
	{
	  error = clib_error_create ("unknown input `%U'",
				     format_unformat_error, input);
	  goto done;
	}
    }

  if (!sub_input_given && !pcap_file_name)
    {
      error = clib_error_create ("no packet data given");
      goto done;
    }

  if (s.node_index == ~0)
    {
      if (pcap_file_name != 0)
	{
	  vlib_node_t *n =
	    vlib_get_node_by_name (vm, (u8 *) "ethernet-input");
	  s.node_index = n->index;
	}
      else
	{
	  error = clib_error_create ("output interface or node not given");
	  goto done;
	}
    }

  {
    pg_node_t *n;

    if (s.node_index < vec_len (pg->nodes))
      n = pg->nodes + s.node_index;
    else
      n = 0;

    if (s.worker_index >= vlib_num_workers ())
      s.worker_index = 0;

    if (pcap_file_name != 0)
      {
	error = pg_pcap_read (&s, pcap_file_name);
	if (error)
	  goto done;
	vec_free (pcap_file_name);
      }

    else if (n && n->unformat_edit
	     && unformat_user (&sub_input, n->unformat_edit, &s))
      ;

    else if (!unformat_user (&sub_input, unformat_pg_payload, &s))
      {
	error = clib_error_create
	  ("failed to parse packet data from `%U'",
	   format_unformat_error, &sub_input);
	goto done;
      }
  }

  error = validate_stream (&s);
  if (error)
    return error;

  pg_stream_add (pg, &s);
  return 0;

done:
  pg_stream_free (&s);
  unformat_free (&sub_input);
  return error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (new_stream_cli, static) = {
  .path = "packet-generator new",
  .function = new_stream,
  .short_help = "Create packet generator stream",
  .long_help =
  "Create packet generator stream\n"
  "\n"
  "Arguments:\n"
  "\n"
  "name STRING          sets stream name\n"
  "interface STRING     interface for stream output \n"
  "node NODE-NAME       node for stream output\n"
  "data STRING          specifies packet data\n"
  "pcap FILENAME        read packet data from pcap file\n"
  "rate PPS             rate to transfer packet data\n"
  "maxframe NPKTS       maximum number of packets per frame\n",
};
/* *INDENT-ON* */

static clib_error_t *
del_stream (vlib_main_t * vm,
	    unformat_input_t * input, vlib_cli_command_t * cmd)
{
  pg_main_t *pg = &pg_main;
  u32 i;

  if (!unformat (input, "%U",
		 &unformat_hash_vec_string, pg->stream_index_by_name, &i))
    return clib_error_create ("expected stream name `%U'",
			      format_unformat_error, input);

  pg_stream_del (pg, i);
  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (del_stream_cli, static) = {
  .path = "packet-generator delete",
  .function = del_stream,
  .short_help = "Delete stream with given name",
};
/* *INDENT-ON* */

static clib_error_t *
change_stream_parameters (vlib_main_t * vm,
			  unformat_input_t * input, vlib_cli_command_t * cmd)
{
  pg_main_t *pg = &pg_main;
  pg_stream_t *s, s_new;
  u32 stream_index = ~0;
  clib_error_t *error;

  if (unformat (input, "%U", unformat_hash_vec_string,
		pg->stream_index_by_name, &stream_index))
    ;
  else
    return clib_error_create ("expecting stream name; got `%U'",
			      format_unformat_error, input);

  s = pool_elt_at_index (pg->streams, stream_index);
  s_new = s[0];

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat_user (input, unformat_pg_stream_parameter, &s_new))
	;

      else
	return clib_error_create ("unknown input `%U'",
				  format_unformat_error, input);
    }

  error = validate_stream (&s_new);
  if (!error)
    {
      s[0] = s_new;
      pg_stream_change (pg, s);
    }

  return error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (change_stream_parameters_cli, static) = {
  .path = "packet-generator configure",
  .short_help = "Change packet generator stream parameters",
  .function = change_stream_parameters,
};
/* *INDENT-ON* */

static clib_error_t *
pg_capture_cmd_fn (vlib_main_t * vm,
		   unformat_input_t * input, vlib_cli_command_t * cmd)
{
  clib_error_t *error = 0;
  vnet_main_t *vnm = vnet_get_main ();
  unformat_input_t _line_input, *line_input = &_line_input;
  vnet_hw_interface_t *hi = 0;
  u8 *pcap_file_name = 0;
  u32 hw_if_index;
  u32 is_disable = 0;
  u32 count = ~0;

  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U",
		    unformat_vnet_hw_interface, vnm, &hw_if_index))
	{
	  hi = vnet_get_hw_interface (vnm, hw_if_index);
	}

      else if (unformat (line_input, "pcap %s", &pcap_file_name))
	;
      else if (unformat (line_input, "count %u", &count))
	;
      else if (unformat (line_input, "disable"))
	is_disable = 1;

      else
	{
	  error = clib_error_create ("unknown input `%U'",
				     format_unformat_error, line_input);
	  goto done;
	}
    }

  if (!hi)
    {
      error = clib_error_return (0, "Please specify interface name");
      goto done;
    }

  if (hi->dev_class_index != pg_dev_class.index)
    {
      error =
	clib_error_return (0, "Please specify packet-generator interface");
      goto done;
    }

  if (!pcap_file_name && is_disable == 0)
    {
      error = clib_error_return (0, "Please specify pcap file name");
      goto done;
    }


  pg_capture_args_t _a, *a = &_a;

  a->hw_if_index = hw_if_index;
  a->dev_instance = hi->dev_instance;
  a->is_enabled = !is_disable;
  a->pcap_file_name = (char *) pcap_file_name;
  a->count = count;

  error = pg_capture (a);

done:
  unformat_free (line_input);

  return error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (pg_capture_cmd, static) = {
  .path = "packet-generator capture",
  .short_help = "packet-generator capture <interface name> pcap <filename> [count <n>]",
  .function = pg_capture_cmd_fn,
};
/* *INDENT-ON* */

static clib_error_t *
create_pg_if_cmd_fn (vlib_main_t * vm,
		     unformat_input_t * input, vlib_cli_command_t * cmd)
{
  pg_main_t *pg = &pg_main;
  unformat_input_t _line_input, *line_input = &_line_input;
  u32 if_id, gso_enabled = 0, gso_size = 0;
  clib_error_t *error = NULL;

  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "interface pg%u", &if_id))
	;
      else if (unformat (line_input, "gso-enabled"))
	{
	  gso_enabled = 1;
	  if (unformat (line_input, "gso-size %u", &gso_size))
	    ;
	  else
	    {
	      error = clib_error_create ("gso enabled but gso size missing");
	      goto done;
	    }
	}
      else
	{
	  error = clib_error_create ("unknown input `%U'",
				     format_unformat_error, line_input);
	  goto done;
	}
    }

  pg_interface_add_or_get (pg, if_id, gso_enabled, gso_size);

done:
  unformat_free (line_input);

  return error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (create_pg_if_cmd, static) = {
  .path = "create packet-generator",
  .short_help = "create packet-generator interface <interface name> [gso-enabled gso-size <size>]",
  .function = create_pg_if_cmd_fn,
};
/* *INDENT-ON* */

/* Dummy init function so that we can be linked in. */
static clib_error_t *
pg_cli_init (vlib_main_t * vm)
{
  return 0;
}

VLIB_INIT_FUNCTION (pg_cli_init);

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