Commit ea725a64 authored by Julien's avatar Julien Committed by Philip Withnall

gio: add g_socket_join_multicast_group_ssm (IGMPv3 SSM)

It adds support for source-specific multicast IGMPv3.

Allow receiving data only from a specified source when joining
a multicast group.

g_socket_join_multicast_group_ssm can be called multiple times
to allow receiving data from more than one source.

Support IPv4 and IPv6.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=740791
parent a79ca79a
......@@ -364,6 +364,9 @@
/* Define if you have the 'sig_atomic_t' type. */
#mesondefine HAVE_SIG_ATOMIC_T
/* Define if there is support for the ioctl request SIOCGIFADDR. */
#mesondefine HAVE_SIOCGIFADDR
/* Define to 1 if you have the `snprintf' function. */
#mesondefine HAVE_SNPRINTF
......
......@@ -951,6 +951,22 @@ fi
AC_CHECK_FUNCS(endservent if_nametoindex if_indextoname sendmmsg recvmmsg)
AC_MSG_CHECKING([for SIOCGIFADDR])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[
#include <sys/ioctl.h>
#include <net/if.h>
]],
[[
struct ifreq ifr;
ioctl(0, SIOCGIFADDR, &ifr);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SIOCGIFADDR, 1, [SIOCGIFADDR is available])
], [
AC_MSG_RESULT(no)
])
AS_IF([test $glib_native_win32 = yes], [
# <wspiapi.h> in the Windows SDK and in mingw-w64 has wrappers for
# inline workarounds for getaddrinfo, getnameinfo and freeaddrinfo if
......
......@@ -2095,6 +2095,8 @@ g_socket_get_credentials
<SUBSECTION>
g_socket_join_multicast_group
g_socket_leave_multicast_group
g_socket_join_multicast_group_ssm
g_socket_leave_multicast_group_ssm
g_socket_get_multicast_loopback
g_socket_set_multicast_loopback
g_socket_get_multicast_ttl
......
......@@ -44,6 +44,10 @@
# include <sys/ioctl.h>
#endif
#ifdef HAVE_SIOCGIFADDR
#include <net/if.h>
#endif
#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif
......@@ -59,6 +63,7 @@
#include "gdatagrambased.h"
#include "gioenumtypes.h"
#include "ginetaddress.h"
#include "ginetsocketaddress.h"
#include "ginitable.h"
#include "gioerror.h"
#include "gioenums.h"
......@@ -2272,6 +2277,9 @@ g_socket_multicast_group_operation (GSocket *socket,
* in RFC 4604 is used. Note that on older platforms this may fail
* with a %G_IO_ERROR_NOT_SUPPORTED error.
*
* To bind to a given source-specific multicast address, use
* g_socket_join_multicast_group_ssm() instead.
*
* Returns: %TRUE on success, %FALSE on error.
*
* Since: 2.32
......@@ -2301,6 +2309,9 @@ g_socket_join_multicast_group (GSocket *socket,
* @socket remains bound to its address and port, and can still receive
* unicast messages after calling this.
*
* To unbind to a given source-specific multicast address, use
* g_socket_leave_multicast_group_ssm() instead.
*
* Returns: %TRUE on success, %FALSE on error.
*
* Since: 2.32
......@@ -2315,6 +2326,282 @@ g_socket_leave_multicast_group (GSocket *socket,
return g_socket_multicast_group_operation (socket, group, source_specific, iface, FALSE, error);
}
static gboolean
g_socket_multicast_group_operation_ssm (GSocket *socket,
GInetAddress *group,
GInetAddress *source_specific,
const gchar *iface,
gboolean join_group,
GError **error)
{
gint result;
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
g_return_val_if_fail (socket->priv->type == G_SOCKET_TYPE_DATAGRAM, FALSE);
g_return_val_if_fail (G_IS_INET_ADDRESS (group), FALSE);
g_return_val_if_fail (iface == NULL || *iface != '\0', FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (!source_specific)
{
return g_socket_multicast_group_operation (socket, group, FALSE, iface,
join_group, error);
}
if (!check_socket (socket, error))
return FALSE;
switch (g_inet_address_get_family (group))
{
case G_SOCKET_FAMILY_INVALID:
case G_SOCKET_FAMILY_UNIX:
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
join_group ?
_("Error joining multicast group: %s") :
_("Error leaving multicast group: %s"),
_("Unsupported socket family"));
return FALSE;
}
break;
case G_SOCKET_FAMILY_IPV4:
{
#ifdef IP_ADD_SOURCE_MEMBERSHIP
gint optname;
struct ip_mreq_source mc_req_src;
if (g_inet_address_get_family (source_specific) !=
G_SOCKET_FAMILY_IPV4)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
join_group ?
_("Error joining multicast group: %s") :
_("Error leaving multicast group: %s"),
_("source-specific not an IPv4 address"));
return FALSE;
}
memset (&mc_req_src, 0, sizeof (mc_req_src));
/* By default use the default IPv4 multicast interface. */
mc_req_src.imr_interface.s_addr = g_htonl (INADDR_ANY);
if (iface)
{
#if defined(G_OS_WIN32) && defined (HAVE_IF_NAMETOINDEX)
guint iface_index = if_nametoindex (iface);
if (iface_index == 0)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errsv),
_("Interface not found: %s"), g_strerror (errsv));
return FALSE;
}
/* (0.0.0.iface_index) only works on Windows. */
mc_req_src.imr_interface.s_addr = g_htonl (iface_index);
#elif defined (HAVE_SIOCGIFADDR)
int ret;
struct ifreq ifr;
struct sockaddr_in *iface_addr;
size_t if_name_len = strlen (iface);
memset (&ifr, 0, sizeof (ifr));
if (if_name_len >= sizeof (ifr.ifr_name))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FILENAME_TOO_LONG,
_("Interface name too long"));
return FALSE;
}
memcpy (ifr.ifr_name, iface, if_name_len);
/* Get the IPv4 address of the given network interface name. */
ret = ioctl (socket->priv->fd, SIOCGIFADDR, &ifr);
if (ret < 0)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errsv),
_("Interface not found: %s"), g_strerror (errsv));
return FALSE;
}
iface_addr = (struct sockaddr_in *) &ifr.ifr_addr;
mc_req_src.imr_interface.s_addr = iface_addr->sin_addr.s_addr;
#endif /* defined(G_OS_WIN32) && defined (HAVE_IF_NAMETOINDEX) */
}
memcpy (&mc_req_src.imr_multiaddr, g_inet_address_to_bytes (group),
g_inet_address_get_native_size (group));
memcpy (&mc_req_src.imr_sourceaddr,
g_inet_address_to_bytes (source_specific),
g_inet_address_get_native_size (source_specific));
optname =
join_group ? IP_ADD_SOURCE_MEMBERSHIP : IP_DROP_SOURCE_MEMBERSHIP;
result = setsockopt (socket->priv->fd, IPPROTO_IP, optname,
&mc_req_src, sizeof (mc_req_src));
#else
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
join_group ?
_("Error joining multicast group: %s") :
_("Error leaving multicast group: %s"),
_("No support for IPv4 source-specific multicast"));
return FALSE;
#endif /* IP_ADD_SOURCE_MEMBERSHIP */
}
break;
case G_SOCKET_FAMILY_IPV6:
{
#ifdef MCAST_JOIN_SOURCE_GROUP
gboolean res;
gint optname;
struct group_source_req mc_req_src;
GSocketAddress *saddr_group, *saddr_source_specific;
guint iface_index = 0;
#if defined (HAVE_IF_NAMETOINDEX)
if (iface)
{
iface_index = if_nametoindex (iface);
if (iface_index == 0)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errsv),
_("Interface not found: %s"), g_strerror (errsv));
return FALSE;
}
}
#endif /* defined (HAVE_IF_NAMETOINDEX) */
mc_req_src.gsr_interface = iface_index;
saddr_group = g_inet_socket_address_new (group, 0);
res = g_socket_address_to_native (saddr_group, &mc_req_src.gsr_group,
sizeof (mc_req_src.gsr_group),
error);
g_object_unref (saddr_group);
if (!res)
return FALSE;
saddr_source_specific = g_inet_socket_address_new (source_specific, 0);
res = g_socket_address_to_native (saddr_source_specific,
&mc_req_src.gsr_source,
sizeof (mc_req_src.gsr_source),
error);
g_object_unref (saddr_source_specific);
if (!res)
return FALSE;
optname =
join_group ? MCAST_JOIN_SOURCE_GROUP : MCAST_LEAVE_SOURCE_GROUP;
result = setsockopt (socket->priv->fd, IPPROTO_IPV6, optname,
&mc_req_src, sizeof (mc_req_src));
#else
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
join_group ?
_("Error joining multicast group: %s") :
_("Error leaving multicast group: %s"),
_("No support for IPv6 source-specific multicast"));
return FALSE;
#endif /* MCAST_JOIN_SOURCE_GROUP */
}
break;
default:
g_return_val_if_reached (FALSE);
}
if (result < 0)
{
int errsv = get_socket_errno ();
g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
join_group ?
_("Error joining multicast group: %s") :
_("Error leaving multicast group: %s"),
socket_strerror (errsv));
return FALSE;
}
return TRUE;
}
/**
* g_socket_join_multicast_group_ssm:
* @socket: a #GSocket.
* @group: a #GInetAddress specifying the group address to join.
* @source_specific: (nullable): a #GInetAddress specifying the
* source-specific multicast address or %NULL to ignore.
* @iface: (nullable): Name of the interface to use, or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* Registers @socket to receive multicast messages sent to @group.
* @socket must be a %G_SOCKET_TYPE_DATAGRAM socket, and must have
* been bound to an appropriate interface and port with
* g_socket_bind().
*
* If @iface is %NULL, the system will automatically pick an interface
* to bind to based on @group.
*
* If @source_specific is not %NULL, use source-specific multicast as
* defined in RFC 4604. Note that on older platforms this may fail
* with a %G_IO_ERROR_NOT_SUPPORTED error.
*
* Note that this function can be called multiple times for the same
* @group with different @source_specific in order to receive multicast
* packets from more than one source.
*
* Returns: %TRUE on success, %FALSE on error.
*
* Since: 2.56
*/
gboolean
g_socket_join_multicast_group_ssm (GSocket *socket,
GInetAddress *group,
GInetAddress *source_specific,
const gchar *iface,
GError **error)
{
return g_socket_multicast_group_operation_ssm (socket, group,
source_specific, iface, TRUE, error);
}
/**
* g_socket_leave_multicast_group_ssm:
* @socket: a #GSocket.
* @group: a #GInetAddress specifying the group address to leave.
* @source_specific: (nullable): a #GInetAddress specifying the
* source-specific multicast address or %NULL to ignore.
* @iface: (nullable): Name of the interface to use, or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* Removes @socket from the multicast group defined by @group, @iface,
* and @source_specific (which must all have the same values they had
* when you joined the group).
*
* @socket remains bound to its address and port, and can still receive
* unicast messages after calling this.
*
* Returns: %TRUE on success, %FALSE on error.
*
* Since: 2.56
*/
gboolean
g_socket_leave_multicast_group_ssm (GSocket *socket,
GInetAddress *group,
GInetAddress *source_specific,
const gchar *iface,
GError **error)
{
return g_socket_multicast_group_operation_ssm (socket, group,
source_specific, iface, FALSE, error);
}
/**
* g_socket_speaks_ipv4:
* @socket: a #GSocket
......
......@@ -157,6 +157,18 @@ gboolean g_socket_leave_multicast_group (GSocket
gboolean source_specific,
const gchar *iface,
GError **error);
GLIB_AVAILABLE_IN_2_56
gboolean g_socket_join_multicast_group_ssm (GSocket *socket,
GInetAddress *group,
GInetAddress *source_specific,
const gchar *iface,
GError **error);
GLIB_AVAILABLE_IN_2_56
gboolean g_socket_leave_multicast_group_ssm (GSocket *socket,
GInetAddress *group,
GInetAddress *source_specific,
const gchar *iface,
GError **error);
GLIB_AVAILABLE_IN_ALL
gboolean g_socket_connect (GSocket *socket,
GSocketAddress *address,
......
......@@ -93,6 +93,18 @@ if host_system != 'windows'
name : 'struct ip_mreqn')
glib_conf.set('HAVE_IP_MREQN', '/**/')
endif
if cc.compiles('''#include <sys/ioctl.h>
#include <net/if.h>
int main (int argc, char ** argv) {
struct ifreq ifr;
ioctl(0, SIOCGIFADDR, &ifr);
return 0;
}''',
name : 'ioctl with request SIOCGIFADDR')
glib_conf.set('HAVE_SIOCGIFADDR', '/**/')
endif
endif
network_args_string = ''
......
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