gstreamer/gst-libs/gst/netbuffer/gstnetbuffer.c
2011-03-08 17:01:41 +00:00

386 lines
10 KiB
C

/* GStreamer
* Copyright (C) <2005> Wim Taymans <wim@fluendo.com>
*
* 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.
*/
/**
* SECTION:gstnetbuffer
* @short_description: Buffer for use in network sources and sinks
*
* #GstNetBuffer is a subclass of a normal #GstBuffer that contains two
* additional metadata fields of type #GstNetAddress named 'to' and 'from'. The
* buffer can be used to store additional information about the origin of the
* buffer data and is used in various network elements to track the to and from
* addresses.
*
* Last reviewed on 2006-08-21 (0.10.10)
*/
#include <string.h>
#include "gstnetbuffer.h"
static void
meta_net_address_transform (GstBuffer * transbuf, GstMetaNetAddress * meta,
GstBuffer * buffer, GstMetaTransformData * data)
{
GstMetaNetAddress *naddr;
switch (data->type) {
case GST_META_TRANSFORM_TRIM:
case GST_META_TRANSFORM_MAKE_WRITABLE:
case GST_META_TRANSFORM_COPY:
default:
/* always copy */
naddr = gst_buffer_add_meta_net_address (transbuf);
memcpy (&naddr->naddr, &meta->naddr, sizeof (meta->naddr));
break;
}
}
const GstMetaInfo *
gst_meta_net_address_get_info (void)
{
static const GstMetaInfo *meta_info = NULL;
if (meta_info == NULL) {
meta_info = gst_meta_register ("GstMetaNetAddress", "GstMetaNetAddress",
sizeof (GstMetaNetAddress),
(GstMetaInitFunction) NULL,
(GstMetaFreeFunction) NULL,
(GstMetaTransformFunction) meta_net_address_transform,
(GstMetaSerializeFunction) NULL, (GstMetaDeserializeFunction) NULL);
}
return meta_info;
}
/**
* gst_netaddress_set_ip4_address:
* @naddr: a network address
* @address: an IPv4 network address.
* @port: a port number to set.
*
* Set @naddr with the IPv4 @address and @port pair.
*
* Note that @port and @address must be expressed in network byte order,
* use g_htons() and g_htonl() to convert them to network byte order.
*/
void
gst_netaddress_set_ip4_address (GstNetAddress * naddr, guint32 address,
guint16 port)
{
g_return_if_fail (naddr != NULL);
naddr->type = GST_NET_TYPE_IP4;
naddr->address.ip4 = address;
naddr->port = port;
}
/**
* gst_netaddress_set_ip6_address:
* @naddr: a network address
* @address: an IPv6 network address.
* @port: a port number to set.
*
* Set @naddr with the IPv6 @address and @port pair.
*
* Note that @port must be expressed in network byte order, use g_htons() to convert
* it to network byte order.
*/
void
gst_netaddress_set_ip6_address (GstNetAddress * naddr, guint8 address[16],
guint16 port)
{
g_return_if_fail (naddr != NULL);
naddr->type = GST_NET_TYPE_IP6;
memcpy (&naddr->address.ip6, address, 16);
naddr->port = port;
}
/**
* gst_netaddress_get_net_type:
* @naddr: a network address
*
* Get the type of address stored in @naddr.
*
* Returns: the network type stored in @naddr.
*/
GstNetType
gst_netaddress_get_net_type (const GstNetAddress * naddr)
{
g_return_val_if_fail (naddr != NULL, GST_NET_TYPE_UNKNOWN);
return naddr->type;
}
/**
* gst_netaddress_get_ip4_address:
* @naddr: a network address
* @address: a location to store the address.
* @port: a location to store the port.
*
* Get the IPv4 address stored in @naddr into @address. This function requires
* that the address type of @naddr is of type #GST_NET_TYPE_IP4.
*
* Note that @port and @address are expressed in network byte order, use
* g_ntohs() and g_ntohl() to convert them to host order.
*
* Returns: TRUE if the address could be retrieved.
*/
gboolean
gst_netaddress_get_ip4_address (const GstNetAddress * naddr, guint32 * address,
guint16 * port)
{
g_return_val_if_fail (naddr != NULL, FALSE);
if (naddr->type == GST_NET_TYPE_UNKNOWN || naddr->type == GST_NET_TYPE_IP6)
return FALSE;
if (address)
*address = naddr->address.ip4;
if (port)
*port = naddr->port;
return TRUE;
}
/**
* gst_netaddress_get_ip6_address:
* @naddr: a network address
* @address: a location to store the result.
* @port: a location to store the port.
*
* Get the IPv6 address stored in @naddr into @address.
*
* If @naddr is of type GST_NET_TYPE_IP4, the transitional IP6 address is
* returned.
*
* Note that @port is expressed in network byte order, use g_ntohs() to convert
* it to host order.
*
* Returns: TRUE if the address could be retrieved.
*/
gboolean
gst_netaddress_get_ip6_address (const GstNetAddress * naddr, guint8 address[16],
guint16 * port)
{
static guint8 ip4_transition[16] =
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF };
g_return_val_if_fail (naddr != NULL, FALSE);
if (naddr->type == GST_NET_TYPE_UNKNOWN)
return FALSE;
if (address) {
if (naddr->type == GST_NET_TYPE_IP6) {
memcpy (address, naddr->address.ip6, 16);
} else { /* naddr->type == GST_NET_TYPE_IP4 */
memcpy (address, ip4_transition, 12);
memcpy (address + 12, (guint8 *) & (naddr->address.ip4), 4);
}
}
if (port)
*port = naddr->port;
return TRUE;
}
/**
* gst_netaddress_get_address_bytes:
* @naddr: a network address
* @address: a location to store the result.
* @port: a location to store the port.
*
* Get just the address bytes stored in @naddr into @address.
*
* Note that @port is expressed in network byte order, use g_ntohs() to convert
* it to host order. IP4 addresses are also stored in network byte order.
*
* Returns: number of bytes actually copied
*
* Since: 0.10.22
*/
gint
gst_netaddress_get_address_bytes (const GstNetAddress * naddr,
guint8 address[16], guint16 * port)
{
gint ret = 0;
g_return_val_if_fail (naddr != NULL, FALSE);
if (naddr->type == GST_NET_TYPE_UNKNOWN)
return 0;
if (address) {
if (naddr->type == GST_NET_TYPE_IP6) {
memcpy (address, naddr->address.ip6, 16);
ret = 16;
} else { /* naddr->type == GST_NET_TYPE_IP4 */
memcpy (address, (guint8 *) & (naddr->address.ip4), 4);
ret = 4;
}
}
if (port)
*port = naddr->port;
return ret;
}
/**
* gst_netaddress_set_address_bytes:
* @naddr: a network address
* @type: the address type (IPv4 or IPV6)
* @address: a location to store the result.
* @port: a location to store the port.
*
* Set just the address bytes stored in @naddr into @address.
*
* Note that @port must be expressed in network byte order, use g_htons() to
* convert it to network byte order order. IP4 address bytes must also be
* stored in network byte order.
*
* Returns: number of bytes actually copied
*
* Since: 0.10.22
*/
gint
gst_netaddress_set_address_bytes (GstNetAddress * naddr, GstNetType type,
guint8 address[16], guint16 port)
{
gint len = 0;
g_return_val_if_fail (naddr != NULL, 0);
naddr->type = type;
switch (naddr->type) {
case GST_NET_TYPE_UNKNOWN:
case GST_NET_TYPE_IP6:
len = 16;
memcpy (naddr->address.ip6, address, 16);
break;
case GST_NET_TYPE_IP4:
len = 4;
memcpy ((guint8 *) & (naddr->address.ip4), address, 4);
break;
}
if (port)
naddr->port = port;
return len;
}
/**
* gst_netaddress_equal:
* @naddr1: The first #GstNetAddress
* @naddr2: The second #GstNetAddress
*
* Compare two #GstNetAddress structures
*
* Returns: TRUE if they are identical, FALSE otherwise
*
* Since: 0.10.18
*/
gboolean
gst_netaddress_equal (const GstNetAddress * naddr1,
const GstNetAddress * naddr2)
{
g_return_val_if_fail (naddr1 != NULL, FALSE);
g_return_val_if_fail (naddr2 != NULL, FALSE);
if (naddr1->type != naddr2->type)
return FALSE;
if (naddr1->port != naddr2->port)
return FALSE;
switch (naddr1->type) {
case GST_NET_TYPE_IP4:
if (naddr1->address.ip4 != naddr2->address.ip4)
return FALSE;
break;
case GST_NET_TYPE_IP6:
if (memcmp (naddr1->address.ip6, naddr2->address.ip6,
sizeof (naddr1->address.ip6)))
return FALSE;
break;
default:
break;
}
return TRUE;
}
/**
* gst_netaddress_to_string:
* @naddr: a #GstNetAddress
* @dest: destination
* @len: len of @dest
*
* Copies a string representation of @naddr into @dest. Up to @len bytes are
* copied.
*
* Returns: the number of bytes which would be produced if the buffer was large
* enough
*
* Since: 0.10.24
*/
gint
gst_netaddress_to_string (const GstNetAddress * naddr, gchar * dest, gulong len)
{
gint result;
g_return_val_if_fail (naddr != NULL, FALSE);
g_return_val_if_fail (dest != NULL, FALSE);
switch (naddr->type) {
case GST_NET_TYPE_IP4:
{
guint32 address;
guint16 port;
gst_netaddress_get_ip4_address (naddr, &address, &port);
address = g_ntohl (address);
result = g_snprintf (dest, len, "%d.%d.%d.%d:%d", (address >> 24) & 0xff,
(address >> 16) & 0xff, (address >> 8) & 0xff, address & 0xff,
g_ntohs (port));
break;
}
case GST_NET_TYPE_IP6:
{
guint8 address[16];
guint16 port;
gst_netaddress_get_ip6_address (naddr, address, &port);
result =
g_snprintf (dest, len, "[%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]:%d",
(address[0] << 8) | address[1], (address[2] << 8) | address[3],
(address[4] << 8) | address[5], (address[6] << 8) | address[7],
(address[8] << 8) | address[9], (address[10] << 8) | address[11],
(address[12] << 8) | address[13], (address[14] << 8) | address[15],
g_ntohs (port));
break;
}
default:
dest[0] = 0;
result = 0;
break;
}
return result;
}