gstreamer/gst/rtsp-server/rtsp-address-pool.c

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/* GStreamer
* Copyright (C) 2012 Wim Taymans <wim.taymans at gmail.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
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/**
* SECTION:rtsp-address-pool
* @short_description: A pool of network addresses
* @see_also: #GstRTSPStream, #GstRTSPStreamTransport
*
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* The #GstRTSPAddressPool is an object that maintains a collection of network
* addresses. It is used to allocate server ports and server multicast addresses
* but also to reserve client provided destination addresses.
*
* A range of addresses can be added with gst_rtsp_address_pool_add_range().
* Both multicast and unicast addresses can be added.
*
* With gst_rtsp_address_pool_acquire_address() an unused address and port range
* can be acquired from the pool. With gst_rtsp_address_pool_reserve_address() a
* specific address can be retrieved. Both methods return a boxed
* #GstRTSPAddress that should be freed with gst_rtsp_address_free() after
* usage, which brings the address back into the pool.
*
* Last reviewed on 2013-07-16 (1.0.0)
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*/
#include <string.h>
#include <gio/gio.h>
#include "rtsp-address-pool.h"
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/**
* gst_rtsp_address_copy:
* @addr: a #GstRTSPAddress
*
* Make a copy of @addr.
*
* Returns: a copy of @addr.
*/
GstRTSPAddress *
gst_rtsp_address_copy (GstRTSPAddress * addr)
{
GstRTSPAddress *copy;
g_return_val_if_fail (addr != NULL, NULL);
copy = g_slice_dup (GstRTSPAddress, addr);
/* only release to the pool when the original is freed. It's a bit
* weird but this will do for now as it avoid us to use refcounting. */
copy->pool = NULL;
copy->address = g_strdup (copy->address);
return copy;
}
static void gst_rtsp_address_pool_release_address (GstRTSPAddressPool * pool,
GstRTSPAddress * addr);
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/**
* gst_rtsp_address_free:
* @addr: a #GstRTSPAddress
*
* Free @addr and releasing it back into the pool when owned by a
* pool.
*/
void
gst_rtsp_address_free (GstRTSPAddress * addr)
{
g_return_if_fail (addr != NULL);
if (addr->pool) {
/* unrefs the pool and sets it to NULL */
gst_rtsp_address_pool_release_address (addr->pool, addr);
}
g_free (addr->address);
g_slice_free (GstRTSPAddress, addr);
}
G_DEFINE_BOXED_TYPE (GstRTSPAddress, gst_rtsp_address,
(GBoxedCopyFunc) gst_rtsp_address_copy,
(GBoxedFreeFunc) gst_rtsp_address_free);
GST_DEBUG_CATEGORY_STATIC (rtsp_address_pool_debug);
#define GST_CAT_DEFAULT rtsp_address_pool_debug
#define GST_RTSP_ADDRESS_POOL_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_RTSP_ADDRESS_POOL, GstRTSPAddressPoolPrivate))
struct _GstRTSPAddressPoolPrivate
{
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GMutex lock; /* protects everything in this struct */
GList *addresses;
GList *allocated;
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gboolean has_unicast_addresses;
};
#define ADDR_IS_IPV4(a) ((a)->size == 4)
#define ADDR_IS_IPV6(a) ((a)->size == 16)
#define ADDR_IS_EVEN_PORT(a) (((a)->port & 1) == 0)
typedef struct
{
guint8 bytes[16];
gsize size;
guint16 port;
} Addr;
typedef struct
{
Addr min;
Addr max;
guint8 ttl;
} AddrRange;
#define RANGE_IS_SINGLE(r) (memcmp ((r)->min.bytes, (r)->max.bytes, (r)->min.size) == 0)
#define gst_rtsp_address_pool_parent_class parent_class
G_DEFINE_TYPE_WITH_PRIVATE (GstRTSPAddressPool, gst_rtsp_address_pool,
G_TYPE_OBJECT);
static void gst_rtsp_address_pool_finalize (GObject * obj);
static void
gst_rtsp_address_pool_class_init (GstRTSPAddressPoolClass * klass)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = gst_rtsp_address_pool_finalize;
GST_DEBUG_CATEGORY_INIT (rtsp_address_pool_debug, "rtspaddresspool", 0,
"GstRTSPAddressPool");
}
static void
gst_rtsp_address_pool_init (GstRTSPAddressPool * pool)
{
pool->priv = gst_rtsp_address_pool_get_instance_private (pool);
g_mutex_init (&pool->priv->lock);
}
static void
free_range (AddrRange * range)
{
g_slice_free (AddrRange, range);
}
static void
gst_rtsp_address_pool_finalize (GObject * obj)
{
GstRTSPAddressPool *pool;
pool = GST_RTSP_ADDRESS_POOL (obj);
g_list_free_full (pool->priv->addresses, (GDestroyNotify) free_range);
g_list_free_full (pool->priv->allocated, (GDestroyNotify) free_range);
g_mutex_clear (&pool->priv->lock);
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
/**
* gst_rtsp_address_pool_new:
*
* Make a new #GstRTSPAddressPool.
*
* Returns: (transfer full): a new #GstRTSPAddressPool
*/
GstRTSPAddressPool *
gst_rtsp_address_pool_new (void)
{
GstRTSPAddressPool *pool;
pool = g_object_new (GST_TYPE_RTSP_ADDRESS_POOL, NULL);
return pool;
}
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/**
* gst_rtsp_address_pool_clear:
* @pool: a #GstRTSPAddressPool
*
* Clear all addresses in @pool. There should be no outstanding
* allocations.
*/
void
gst_rtsp_address_pool_clear (GstRTSPAddressPool * pool)
{
GstRTSPAddressPoolPrivate *priv;
g_return_if_fail (GST_IS_RTSP_ADDRESS_POOL (pool));
g_return_if_fail (pool->priv->allocated == NULL);
priv = pool->priv;
g_mutex_lock (&priv->lock);
g_list_free_full (priv->addresses, (GDestroyNotify) free_range);
priv->addresses = NULL;
g_mutex_unlock (&priv->lock);
}
static gboolean
fill_address (const gchar * address, guint16 port, Addr * addr,
gboolean is_multicast)
{
GInetAddress *inet;
inet = g_inet_address_new_from_string (address);
if (inet == NULL)
return FALSE;
if (is_multicast != g_inet_address_get_is_multicast (inet)) {
g_object_unref (inet);
return FALSE;
}
addr->size = g_inet_address_get_native_size (inet);
memcpy (addr->bytes, g_inet_address_to_bytes (inet), addr->size);
g_object_unref (inet);
addr->port = port;
return TRUE;
}
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static gchar *
get_address_string (Addr * addr)
{
gchar *res;
GInetAddress *inet;
inet = g_inet_address_new_from_bytes (addr->bytes,
addr->size == 4 ? G_SOCKET_FAMILY_IPV4 : G_SOCKET_FAMILY_IPV6);
res = g_inet_address_to_string (inet);
g_object_unref (inet);
return res;
}
/**
* gst_rtsp_address_pool_add_range:
* @pool: a #GstRTSPAddressPool
* @min_address: a minimum address to add
* @max_address: a maximum address to add
* @min_port: the minimum port
* @max_port: the maximum port
* @ttl: a TTL or 0 for unicast addresses
*
* Adds the addresses from @min_addess to @max_address (inclusive)
* to @pool. The valid port range for the addresses will be from @min_port to
* @max_port inclusive.
*
* When @ttl is 0, @min_address and @max_address should be unicast addresses.
* @min_address and @max_address can be set to
* #GST_RTSP_ADDRESS_POOL_ANY_IPV4 or #GST_RTSP_ADDRESS_POOL_ANY_IPV6 to bind
* to all available IPv4 or IPv6 addresses.
*
* When @ttl > 0, @min_address and @max_address should be multicast addresses.
*
* Returns: %TRUE if the addresses could be added.
*/
gboolean
gst_rtsp_address_pool_add_range (GstRTSPAddressPool * pool,
const gchar * min_address, const gchar * max_address,
guint16 min_port, guint16 max_port, guint8 ttl)
{
AddrRange *range;
GstRTSPAddressPoolPrivate *priv;
gboolean is_multicast;
g_return_val_if_fail (GST_IS_RTSP_ADDRESS_POOL (pool), FALSE);
g_return_val_if_fail (min_port <= max_port, FALSE);
priv = pool->priv;
is_multicast = ttl != 0;
range = g_slice_new0 (AddrRange);
if (!fill_address (min_address, min_port, &range->min, is_multicast))
goto invalid;
if (!fill_address (max_address, max_port, &range->max, is_multicast))
goto invalid;
if (range->min.size != range->max.size)
goto invalid;
if (memcmp (range->min.bytes, range->max.bytes, range->min.size) > 0)
goto invalid;
range->ttl = ttl;
GST_DEBUG_OBJECT (pool, "adding %s-%s:%u-%u ttl %u", min_address, max_address,
min_port, max_port, ttl);
g_mutex_lock (&priv->lock);
priv->addresses = g_list_prepend (priv->addresses, range);
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if (!is_multicast)
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priv->has_unicast_addresses = TRUE;
g_mutex_unlock (&priv->lock);
return TRUE;
/* ERRORS */
invalid:
{
GST_ERROR_OBJECT (pool, "invalid address range %s-%s", min_address,
max_address);
g_slice_free (AddrRange, range);
return FALSE;
}
}
static void
inc_address (Addr * addr, guint count)
{
gint i;
guint carry;
carry = count;
for (i = addr->size - 1; i >= 0 && carry > 0; i--) {
carry += addr->bytes[i];
addr->bytes[i] = carry & 0xff;
carry >>= 8;
}
}
/* tells us the number of addresses between min_addr and max_addr */
static guint
diff_address (Addr * max_addr, Addr * min_addr)
{
gint i;
guint result = 0;
g_return_val_if_fail (min_addr->size == max_addr->size, 0);
for (i = 0; i < min_addr->size; i++) {
g_return_val_if_fail (result < (1 << 24), result);
result <<= 8;
result += max_addr->bytes[i] - min_addr->bytes[i];
}
return result;
}
static AddrRange *
split_range (GstRTSPAddressPool * pool, AddrRange * range, guint skip_addr,
guint skip_port, gint n_ports)
{
GstRTSPAddressPoolPrivate *priv = pool->priv;
AddrRange *temp;
if (skip_addr) {
temp = g_slice_dup (AddrRange, range);
memcpy (temp->max.bytes, temp->min.bytes, temp->min.size);
inc_address (&temp->max, skip_addr - 1);
priv->addresses = g_list_prepend (priv->addresses, temp);
inc_address (&range->min, skip_addr);
}
if (!RANGE_IS_SINGLE (range)) {
/* min and max are not the same, we have more than one address. */
temp = g_slice_dup (AddrRange, range);
/* increment the range min address */
inc_address (&temp->min, 1);
/* and store back in pool */
priv->addresses = g_list_prepend (priv->addresses, temp);
/* adjust range with only the first address */
memcpy (range->max.bytes, range->min.bytes, range->min.size);
}
/* range now contains only one single address */
if (skip_port > 0) {
/* make a range with the skipped ports */
temp = g_slice_dup (AddrRange, range);
temp->max.port = temp->min.port + skip_port - 1;
/* and store back in pool */
priv->addresses = g_list_prepend (priv->addresses, temp);
/* increment range port */
range->min.port += skip_port;
}
/* range now contains single address with desired port number */
if (range->max.port - range->min.port + 1 > n_ports) {
/* make a range with the remaining ports */
temp = g_slice_dup (AddrRange, range);
temp->min.port += n_ports;
/* and store back in pool */
priv->addresses = g_list_prepend (priv->addresses, temp);
/* and truncate port */
range->max.port = range->min.port + n_ports - 1;
}
return range;
}
/**
* gst_rtsp_address_pool_acquire_address:
* @pool: a #GstRTSPAddressPool
* @flags: flags
* @n_ports: the amount of ports
*
* Take an address and ports from @pool. @flags can be used to control the
* allocation. @n_ports consecutive ports will be allocated of which the first
* one can be found in @port.
*
* Returns: (nullable): a #GstRTSPAddress that should be freed with
* gst_rtsp_address_free after use or %NULL when no address could be
* acquired.
*/
GstRTSPAddress *
gst_rtsp_address_pool_acquire_address (GstRTSPAddressPool * pool,
GstRTSPAddressFlags flags, gint n_ports)
{
GstRTSPAddressPoolPrivate *priv;
GList *walk, *next;
AddrRange *result;
GstRTSPAddress *addr;
g_return_val_if_fail (GST_IS_RTSP_ADDRESS_POOL (pool), NULL);
g_return_val_if_fail (n_ports > 0, NULL);
priv = pool->priv;
result = NULL;
addr = NULL;
g_mutex_lock (&priv->lock);
/* go over available ranges */
for (walk = priv->addresses; walk; walk = next) {
AddrRange *range;
gint ports, skip;
range = walk->data;
next = walk->next;
/* check address type when given */
if (flags & GST_RTSP_ADDRESS_FLAG_IPV4 && !ADDR_IS_IPV4 (&range->min))
continue;
if (flags & GST_RTSP_ADDRESS_FLAG_IPV6 && !ADDR_IS_IPV6 (&range->min))
continue;
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if (flags & GST_RTSP_ADDRESS_FLAG_MULTICAST && range->ttl == 0)
continue;
if (flags & GST_RTSP_ADDRESS_FLAG_UNICAST && range->ttl != 0)
continue;
/* check for enough ports */
ports = range->max.port - range->min.port + 1;
if (flags & GST_RTSP_ADDRESS_FLAG_EVEN_PORT
&& !ADDR_IS_EVEN_PORT (&range->min))
skip = 1;
else
skip = 0;
if (ports - skip < n_ports)
continue;
/* we found a range, remove from the list */
priv->addresses = g_list_delete_link (priv->addresses, walk);
/* now split and exit our loop */
result = split_range (pool, range, 0, skip, n_ports);
priv->allocated = g_list_prepend (priv->allocated, result);
break;
}
g_mutex_unlock (&priv->lock);
if (result) {
addr = g_slice_new0 (GstRTSPAddress);
addr->pool = g_object_ref (pool);
addr->address = get_address_string (&result->min);
addr->n_ports = n_ports;
addr->port = result->min.port;
addr->ttl = result->ttl;
addr->priv = result;
GST_DEBUG_OBJECT (pool, "got address %s:%u ttl %u", addr->address,
addr->port, addr->ttl);
}
return addr;
}
/**
* gst_rtsp_address_pool_release_address:
* @pool: a #GstRTSPAddressPool
* @id: an address id
*
* Release a previously acquired address (with
* gst_rtsp_address_pool_acquire_address()) back into @pool.
*/
static void
gst_rtsp_address_pool_release_address (GstRTSPAddressPool * pool,
GstRTSPAddress * addr)
{
GstRTSPAddressPoolPrivate *priv;
GList *find;
AddrRange *range;
g_return_if_fail (GST_IS_RTSP_ADDRESS_POOL (pool));
g_return_if_fail (addr != NULL);
g_return_if_fail (addr->pool == pool);
priv = pool->priv;
range = addr->priv;
/* we don't want to free twice */
addr->priv = NULL;
addr->pool = NULL;
g_mutex_lock (&priv->lock);
find = g_list_find (priv->allocated, range);
if (find == NULL)
goto not_found;
priv->allocated = g_list_delete_link (priv->allocated, find);
/* FIXME, merge and do something clever */
priv->addresses = g_list_prepend (priv->addresses, range);
g_mutex_unlock (&priv->lock);
g_object_unref (pool);
return;
/* ERRORS */
not_found:
{
g_warning ("Released unknown address %p", addr);
g_mutex_unlock (&priv->lock);
return;
}
}
static void
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dump_range (AddrRange * range, GstRTSPAddressPool * pool)
{
gchar *addr1, *addr2;
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addr1 = get_address_string (&range->min);
addr2 = get_address_string (&range->max);
g_print (" address %s-%s, port %u-%u, ttl %u\n", addr1, addr2,
range->min.port, range->max.port, range->ttl);
g_free (addr1);
g_free (addr2);
}
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/**
* gst_rtsp_address_pool_dump:
* @pool: a #GstRTSPAddressPool
*
* Dump the free and allocated addresses to stdout.
*/
void
gst_rtsp_address_pool_dump (GstRTSPAddressPool * pool)
{
GstRTSPAddressPoolPrivate *priv;
g_return_if_fail (GST_IS_RTSP_ADDRESS_POOL (pool));
priv = pool->priv;
g_mutex_lock (&priv->lock);
g_print ("free:\n");
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g_list_foreach (priv->addresses, (GFunc) dump_range, pool);
g_print ("allocated:\n");
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g_list_foreach (priv->allocated, (GFunc) dump_range, pool);
g_mutex_unlock (&priv->lock);
}
static GList *
find_address_in_ranges (GList * addresses, Addr * addr, guint port,
guint n_ports, guint ttl)
{
GList *walk, *next;
/* go over available ranges */
for (walk = addresses; walk; walk = next) {
AddrRange *range;
range = walk->data;
next = walk->next;
/* Not the right type of address */
if (range->min.size != addr->size)
continue;
/* Check that the address is in the interval */
if (memcmp (range->min.bytes, addr->bytes, addr->size) > 0 ||
memcmp (range->max.bytes, addr->bytes, addr->size) < 0)
continue;
/* Make sure the requested ports are inside the range */
if (port < range->min.port || port + n_ports - 1 > range->max.port)
continue;
if (ttl != range->ttl)
continue;
break;
}
return walk;
}
/**
* gst_rtsp_address_pool_reserve_address:
* @pool: a #GstRTSPAddressPool
* @ip_address: The IP address to reserve
* @port: The first port to reserve
* @n_ports: The number of ports
* @ttl: The requested ttl
* @address: (out): storage for a #GstRTSPAddress
*
* Take a specific address and ports from @pool. @n_ports consecutive
* ports will be allocated of which the first one can be found in
* @port.
*
* If @ttl is 0, @address should be a unicast address. If @ttl > 0, @address
* should be a valid multicast address.
*
* Returns: #GST_RTSP_ADDRESS_POOL_OK if an address was reserved. The address
* is returned in @address and should be freed with gst_rtsp_address_free
* after use.
*/
GstRTSPAddressPoolResult
gst_rtsp_address_pool_reserve_address (GstRTSPAddressPool * pool,
const gchar * ip_address, guint port, guint n_ports, guint ttl,
GstRTSPAddress ** address)
{
GstRTSPAddressPoolPrivate *priv;
Addr input_addr;
GList *list;
AddrRange *addr_range;
GstRTSPAddress *addr;
gboolean is_multicast;
GstRTSPAddressPoolResult result;
g_return_val_if_fail (GST_IS_RTSP_ADDRESS_POOL (pool),
GST_RTSP_ADDRESS_POOL_EINVAL);
g_return_val_if_fail (ip_address != NULL, GST_RTSP_ADDRESS_POOL_EINVAL);
g_return_val_if_fail (port > 0, GST_RTSP_ADDRESS_POOL_EINVAL);
g_return_val_if_fail (n_ports > 0, GST_RTSP_ADDRESS_POOL_EINVAL);
g_return_val_if_fail (address != NULL, GST_RTSP_ADDRESS_POOL_EINVAL);
priv = pool->priv;
addr_range = NULL;
addr = NULL;
is_multicast = ttl != 0;
if (!fill_address (ip_address, port, &input_addr, is_multicast))
goto invalid;
g_mutex_lock (&priv->lock);
list = find_address_in_ranges (priv->addresses, &input_addr, port, n_ports,
ttl);
if (list != NULL) {
AddrRange *range = list->data;
guint skip_port, skip_addr;
skip_addr = diff_address (&input_addr, &range->min);
skip_port = port - range->min.port;
GST_DEBUG_OBJECT (pool, "diff 0x%08x/%u", skip_addr, skip_port);
/* we found a range, remove from the list */
priv->addresses = g_list_delete_link (priv->addresses, list);
/* now split and exit our loop */
addr_range = split_range (pool, range, skip_addr, skip_port, n_ports);
priv->allocated = g_list_prepend (priv->allocated, addr_range);
}
if (addr_range) {
addr = g_slice_new0 (GstRTSPAddress);
addr->pool = g_object_ref (pool);
addr->address = get_address_string (&addr_range->min);
addr->n_ports = n_ports;
addr->port = addr_range->min.port;
addr->ttl = addr_range->ttl;
addr->priv = addr_range;
result = GST_RTSP_ADDRESS_POOL_OK;
GST_DEBUG_OBJECT (pool, "reserved address %s:%u ttl %u", addr->address,
addr->port, addr->ttl);
} else {
/* We failed to reserve the address. Check if it was because the address
* was already in use or if it wasn't in the pool to begin with */
list = find_address_in_ranges (priv->allocated, &input_addr, port, n_ports,
ttl);
if (list != NULL) {
result = GST_RTSP_ADDRESS_POOL_ERESERVED;
} else {
result = GST_RTSP_ADDRESS_POOL_ERANGE;
}
}
g_mutex_unlock (&priv->lock);
*address = addr;
return result;
/* ERRORS */
invalid:
{
GST_ERROR_OBJECT (pool, "invalid address %s:%u/%u/%u", ip_address,
port, n_ports, ttl);
*address = NULL;
return GST_RTSP_ADDRESS_POOL_EINVAL;
}
}
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/**
* gst_rtsp_address_pool_has_unicast_addresses:
* @pool: a #GstRTSPAddressPool
*
* Used to know if the pool includes any unicast addresses.
*
* Returns: %TRUE if the pool includes any unicast addresses, %FALSE otherwise
*/
gboolean
gst_rtsp_address_pool_has_unicast_addresses (GstRTSPAddressPool * pool)
{
GstRTSPAddressPoolPrivate *priv;
gboolean has_unicast_addresses;
g_return_val_if_fail (GST_IS_RTSP_ADDRESS_POOL (pool), FALSE);
priv = pool->priv;
g_mutex_lock (&priv->lock);
has_unicast_addresses = priv->has_unicast_addresses;
g_mutex_unlock (&priv->lock);
return has_unicast_addresses;
}