/* GStreamer

 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>

 * Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <gst/gst-i18n-plugin.h>

#include "gsttcp.h"

#include "gsttcpserversrc.h"

#include <string.h>             /* memset */

#include <unistd.h>

#include <sys/ioctl.h>

#include <fcntl.h>

GST_DEBUG_CATEGORY_STATIC (tcpserversrc_debug);

#define GST_CAT_DEFAULT tcpserversrc_debug

#define TCP_DEFAULT_LISTEN_HOST         NULL    /* listen on all interfaces */

#define TCP_BACKLOG                     1       /* client connection queue */

static const GstElementDetails gst_tcp_server_src_details =

GST_ELEMENT_DETAILS ("TCP server source",

    "Source/Network",

    "Receive data as a server over the network via TCP",

    "Thomas Vander Stichele <thomas at apestaart dot org>");

static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",

    GST_PAD_SRC,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS_ANY);

enum

{

  PROP_0,

  PROP_HOST,

  PROP_PORT,

  PROP_PROTOCOL

};

GST_BOILERPLATE (GstTCPServerSrc, gst_tcp_server_src, GstPushSrc,

    GST_TYPE_PUSH_SRC);

static void gst_tcp_server_src_finalize (GObject * gobject);

static gboolean gst_tcp_server_src_start (GstBaseSrc * bsrc);

static gboolean gst_tcp_server_src_stop (GstBaseSrc * bsrc);

static gboolean gst_tcp_server_src_unlock (GstBaseSrc * bsrc);

static GstFlowReturn gst_tcp_server_src_create (GstPushSrc * psrc,

    GstBuffer ** buf);

static void gst_tcp_server_src_set_property (GObject * object, guint prop_id,

    const GValue * value, GParamSpec * pspec);

static void gst_tcp_server_src_get_property (GObject * object, guint prop_id,

    GValue * value, GParamSpec * pspec);

static void

gst_tcp_server_src_base_init (gpointer g_class)

{

  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_add_pad_template (element_class,

      gst_static_pad_template_get (&srctemplate));

  gst_element_class_set_details (element_class, &gst_tcp_server_src_details);

}

static void

gst_tcp_server_src_class_init (GstTCPServerSrcClass * klass)

{

  GObjectClass *gobject_class;

  GstBaseSrcClass *gstbasesrc_class;

  GstPushSrcClass *gstpush_src_class;

  gobject_class = (GObjectClass *) klass;

  gstbasesrc_class = (GstBaseSrcClass *) klass;

  gstpush_src_class = (GstPushSrcClass *) klass;

  gobject_class->set_property = gst_tcp_server_src_set_property;

  gobject_class->get_property = gst_tcp_server_src_get_property;

  gobject_class->finalize = gst_tcp_server_src_finalize;

  g_object_class_install_property (gobject_class, PROP_HOST,

      g_param_spec_string ("host", "Host", "The hostname to listen as",

  g_object_class_install_property (gobject_class, PROP_PORT,

      g_param_spec_int ("port", "Port", "The port to listen to",

  g_object_class_install_property (gobject_class, PROP_PROTOCOL,

      g_param_spec_enum ("protocol", "Protocol", "The protocol to wrap data in",

  gstbasesrc_class->start = gst_tcp_server_src_start;

  gstbasesrc_class->stop = gst_tcp_server_src_stop;

  gstbasesrc_class->unlock = gst_tcp_server_src_unlock;

  gstpush_src_class->create = gst_tcp_server_src_create;

  GST_DEBUG_CATEGORY_INIT (tcpserversrc_debug, "tcpserversrc", 0,

      "TCP Server Source");

}

static void

gst_tcp_server_src_init (GstTCPServerSrc * src, GstTCPServerSrcClass * g_class)

{

  src->server_port = TCP_DEFAULT_PORT;

  src->host = g_strdup (TCP_DEFAULT_HOST);

  src->server_sock_fd.fd = -1;

  src->client_sock_fd.fd = -1;

  src->protocol = GST_TCP_PROTOCOL_NONE;

  GST_OBJECT_FLAG_UNSET (src, GST_TCP_SERVER_SRC_OPEN);

}

static void

gst_tcp_server_src_finalize (GObject * gobject)

{

  GstTCPServerSrc *src = GST_TCP_SERVER_SRC (gobject);

  g_free (src->host);

  G_OBJECT_CLASS (parent_class)->finalize (gobject);

}

static GstFlowReturn

gst_tcp_server_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)

{

  GstTCPServerSrc *src;

  GstFlowReturn ret = GST_FLOW_OK;

  src = GST_TCP_SERVER_SRC (psrc);

  if (!GST_OBJECT_FLAG_IS_SET (src, GST_TCP_SERVER_SRC_OPEN))

    goto wrong_state;

restart:

  if (src->client_sock_fd.fd >= 0) {

    /* if we have a client, wait for read */

    gst_poll_fd_ctl_read (src->fdset, &src->server_sock_fd, FALSE);

    gst_poll_fd_ctl_read (src->fdset, &src->client_sock_fd, TRUE);

  } else {

    /* else wait on server socket for connections */

    gst_poll_fd_ctl_read (src->fdset, &src->server_sock_fd, TRUE);

  }

  /* no action (0) is an error too in our case */

  if ((ret = gst_poll_wait (src->fdset, GST_CLOCK_TIME_NONE)) <= 0) {

    if (ret == -1 && errno == EBUSY)

      goto select_cancelled;

    else

      goto select_error;

  }

  /* if we have no client socket we can accept one now */

  if (src->client_sock_fd.fd < 0) {

    if (gst_poll_fd_can_read (src->fdset, &src->server_sock_fd)) {

      if ((src->client_sock_fd.fd =

              accept (src->server_sock_fd.fd,

                  (struct sockaddr *) &src->client_sin,

                  &src->client_sin_len)) == -1)

        goto accept_error;

      gst_poll_add_fd (src->fdset, &src->client_sock_fd);

    }

    /* and restart now to poll the socket. */

    goto restart;

  }

  GST_LOG_OBJECT (src, "asked for a buffer");

  switch (src->protocol) {

    case GST_TCP_PROTOCOL_NONE:

      ret = gst_tcp_read_buffer (GST_ELEMENT (src), src->client_sock_fd.fd,

          src->fdset, outbuf);

      break;

    case GST_TCP_PROTOCOL_GDP:

      if (!src->caps_received) {

        GstCaps *caps;

        gchar *string;

        ret = gst_tcp_gdp_read_caps (GST_ELEMENT (src), src->client_sock_fd.fd,

            src->fdset, &caps);

        if (ret == GST_FLOW_WRONG_STATE)

          goto gdp_cancelled;

        if (ret != GST_FLOW_OK)

          goto gdp_caps_read_error;

        src->caps_received = TRUE;

        string = gst_caps_to_string (caps);

        GST_DEBUG_OBJECT (src, "Received caps through GDP: %s", string);

        g_free (string);

        gst_pad_set_caps (GST_BASE_SRC_PAD (psrc), caps);

      }

      ret = gst_tcp_gdp_read_buffer (GST_ELEMENT (src), src->client_sock_fd.fd,

          src->fdset, outbuf);

      if (ret == GST_FLOW_OK)

        gst_buffer_set_caps (*outbuf, GST_PAD_CAPS (GST_BASE_SRC_PAD (src)));

      break;

    default:

      /* need to assert as buf == NULL */

      g_assert ("Unhandled protocol type");

      break;

  }

  if (ret == GST_FLOW_OK) {

    GST_LOG_OBJECT (src,

        "Returning buffer from _get of size %d, ts %"

        GST_TIME_FORMAT ", dur %" GST_TIME_FORMAT

        ", offset %" G_GINT64_FORMAT ", offset_end %" G_GINT64_FORMAT,

        GST_BUFFER_SIZE (*outbuf),

        GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (*outbuf)),

        GST_TIME_ARGS (GST_BUFFER_DURATION (*outbuf)),

        GST_BUFFER_OFFSET (*outbuf), GST_BUFFER_OFFSET_END (*outbuf));

  }

  return ret;

wrong_state:

  {

    GST_DEBUG_OBJECT (src, "connection to closed, cannot read data");

    return GST_FLOW_WRONG_STATE;

  }

select_error:

  {

    GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),

        ("Select error: %s", g_strerror (errno)));

    return GST_FLOW_ERROR;

  }

select_cancelled:

  {

    GST_DEBUG_OBJECT (src, "select canceled");

    return GST_FLOW_WRONG_STATE;

  }

accept_error:

  {

    GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),

        ("Could not accept client on server socket: %s", g_strerror (errno)));

    return GST_FLOW_ERROR;

  }

gdp_cancelled:

  {

    GST_DEBUG_OBJECT (src, "reading gdp canceled");

    return GST_FLOW_WRONG_STATE;

  }

gdp_caps_read_error:

  {

    /* if we did not get canceled, report an error */

    if (ret != GST_FLOW_WRONG_STATE) {

      GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),

          ("Could not read caps through GDP"));

    }

    return ret;

  }

}

static void

gst_tcp_server_src_set_property (GObject * object, guint prop_id,

    const GValue * value, GParamSpec * pspec)

{

  GstTCPServerSrc *tcpserversrc = GST_TCP_SERVER_SRC (object);

  switch (prop_id) {

    case PROP_HOST:

      if (!g_value_get_string (value)) {

        g_warning ("host property cannot be NULL");

        break;

      }

      g_free (tcpserversrc->host);

      tcpserversrc->host = g_strdup (g_value_get_string (value));

      break;

    case PROP_PORT:

      tcpserversrc->server_port = g_value_get_int (value);

      break;

    case PROP_PROTOCOL:

      tcpserversrc->protocol = g_value_get_enum (value);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

static void

gst_tcp_server_src_get_property (GObject * object, guint prop_id,

    GValue * value, GParamSpec * pspec)

{

  GstTCPServerSrc *tcpserversrc = GST_TCP_SERVER_SRC (object);

  switch (prop_id) {

    case PROP_HOST:

      g_value_set_string (value, tcpserversrc->host);

      break;

    case PROP_PORT:

      g_value_set_int (value, tcpserversrc->server_port);

      break;

    case PROP_PROTOCOL:

      g_value_set_enum (value, tcpserversrc->protocol);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

/* set up server */

static gboolean

gst_tcp_server_src_start (GstBaseSrc * bsrc)

{

  int ret;

  GstTCPServerSrc *src = GST_TCP_SERVER_SRC (bsrc);

  /* reset caps_received flag */

  src->caps_received = FALSE;

  /* create the server listener socket */

  if ((src->server_sock_fd.fd = socket (AF_INET, SOCK_STREAM, 0)) == -1)

    goto socket_error;

  GST_DEBUG_OBJECT (src, "opened receiving server socket with fd %d",

      src->server_sock_fd.fd);

  /* make address reusable */

  ret = 1;

  if (setsockopt (src->server_sock_fd.fd, SOL_SOCKET, SO_REUSEADDR, &ret,

          sizeof (int)) < 0)

    goto sock_opt;

  /* name the socket */

  memset (&src->server_sin, 0, sizeof (src->server_sin));

  src->server_sin.sin_family = AF_INET; /* network socket */

  src->server_sin.sin_port = htons (src->server_port);  /* on port */

  if (src->host) {

    gchar *host;

    if (!(host = gst_tcp_host_to_ip (GST_ELEMENT (src), src->host)))

      goto host_error;

    src->server_sin.sin_addr.s_addr = inet_addr (host);

    g_free (host);

  } else

    src->server_sin.sin_addr.s_addr = htonl (INADDR_ANY);

  /* bind it */

  GST_DEBUG_OBJECT (src, "binding server socket to address");

  if ((ret = bind (src->server_sock_fd.fd, (struct sockaddr *) &src->server_sin,

              sizeof (src->server_sin))) < 0)

    goto bind_error;

  GST_DEBUG_OBJECT (src, "listening on server socket %d with queue of %d",

      src->server_sock_fd.fd, TCP_BACKLOG);

  if (listen (src->server_sock_fd.fd, TCP_BACKLOG) == -1)

    goto listen_error;

  /* create an fdset to keep track of our file descriptors */

  if ((src->fdset = gst_poll_new (TRUE)) == NULL)

    goto socket_pair;

  gst_poll_add_fd (src->fdset, &src->server_sock_fd);

  GST_DEBUG_OBJECT (src, "received client");

  GST_OBJECT_FLAG_SET (src, GST_TCP_SERVER_SRC_OPEN);

  return TRUE;

  /* ERRORS */

socket_error:

  {

    GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL), GST_ERROR_SYSTEM);

    return FALSE;

  }

sock_opt:

  {

    GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL),

        ("Could not setsockopt: %s", g_strerror (errno)));

    gst_tcp_socket_close (&src->server_sock_fd);

    return FALSE;

  }

host_error:

  {

    gst_tcp_socket_close (&src->server_sock_fd);

    return FALSE;

  }

bind_error:

  {

    gst_tcp_socket_close (&src->server_sock_fd);

    switch (errno) {

      default:

        GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),

            ("bind failed: %s", g_strerror (errno)));

        break;

    }

    return FALSE;

  }

listen_error:

  {

    gst_tcp_socket_close (&src->server_sock_fd);

    GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),

        ("Could not listen on server socket: %s", g_strerror (errno)));

    return FALSE;

  }

socket_pair:

  {

    GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ_WRITE, (NULL),

        GST_ERROR_SYSTEM);

    gst_tcp_socket_close (&src->server_sock_fd);

    return FALSE;

  }

}

static gboolean

gst_tcp_server_src_stop (GstBaseSrc * bsrc)

{

  GstTCPServerSrc *src = GST_TCP_SERVER_SRC (bsrc);

  gst_poll_free (src->fdset);

  src->fdset = NULL;

  gst_tcp_socket_close (&src->server_sock_fd);

  gst_tcp_socket_close (&src->client_sock_fd);

  GST_OBJECT_FLAG_UNSET (src, GST_TCP_SERVER_SRC_OPEN);

  return TRUE;

}

/* will be called only between calls to start() and stop() */

static gboolean

gst_tcp_server_src_unlock (GstBaseSrc * bsrc)

{

  GstTCPServerSrc *src = GST_TCP_SERVER_SRC (bsrc);

  gst_poll_set_flushing (src->fdset, TRUE);

  return TRUE;

}