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udpsrc: receive control messages only in multicast

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Control messages are used only in multicast mode - to detect if the destination
address is not ours and possibly drop the packet. However in non-multicast
modes the messages are still allocated and freed even if not used. Therefore
request control messages from g_socket_receive_message() only in multicast
mode.

https://bugzilla.gnome.org/show_bug.cgi?id=772841
This commit is contained in:
Petr Kulhavy 2016-11-12 23:34:23 +01:00 committed by Sebastian Dröge
parent 55297bdbad
commit 1fc572d740
1 changed files with 27 additions and 25 deletions
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52
gst/udp/gstudpsrc.c
View file

@ -847,6 +847,7 @@ gst_udpsrc_create (GstPushSrc * psrc, GstBuffer ** buf)
gssize res;
gsize offset;
GSocketControlMessage **msgs = NULL;
GSocketControlMessage ***p_msgs;
gint n_msgs = 0, i;
udpsrc = GST_UDPSRC_CAST (psrc);
@ -854,6 +855,11 @@ gst_udpsrc_create (GstPushSrc * psrc, GstBuffer ** buf)
if (!gst_udpsrc_ensure_mem (udpsrc))
goto memory_alloc_error;
/* optimization: use messages only in multicast mode */
p_msgs =
(g_inet_address_get_is_multicast (g_inet_socket_address_get_address
(udpsrc->addr))) ? &msgs : NULL;
/* Retrieve sender address unless we've been configured not to do so */
p_saddr = (udpsrc->retrieve_sender_address) ? &saddr : NULL;
@ -898,7 +904,7 @@ retry:
res =
g_socket_receive_message (udpsrc->used_socket, p_saddr, udpsrc->vec, 2,
&msgs, &n_msgs, &flags, udpsrc->cancellable, &err);
p_msgs, &n_msgs, &flags, udpsrc->cancellable, &err);
if (G_UNLIKELY (res < 0)) {
/* G_IO_ERROR_HOST_UNREACHABLE for a UDP socket means that a packet sent
@ -923,44 +929,40 @@ retry:
/* Retry if multicast and the destination address is not ours. We don't want
* to receive arbitrary packets */
{
if (p_msgs) {
GInetAddress *iaddr = g_inet_socket_address_get_address (udpsrc->addr);
gboolean skip_packet = FALSE;
gsize iaddr_size = g_inet_address_get_native_size (iaddr);
const guint8 *iaddr_bytes = g_inet_address_to_bytes (iaddr);
if (g_inet_address_get_is_multicast (iaddr)) {
for (i = 0; i < n_msgs && !skip_packet; i++) {
for (i = 0; i < n_msgs && !skip_packet; i++) {
#ifdef IP_PKTINFO
if (GST_IS_IP_PKTINFO_MESSAGE (msgs[i])) {
GstIPPktinfoMessage *msg = GST_IP_PKTINFO_MESSAGE (msgs[i]);
if (GST_IS_IP_PKTINFO_MESSAGE (msgs[i])) {
GstIPPktinfoMessage *msg = GST_IP_PKTINFO_MESSAGE (msgs[i]);
if (sizeof (msg->addr) == iaddr_size
&& memcmp (iaddr_bytes, &msg->addr, sizeof (msg->addr)))
skip_packet = TRUE;
}
if (sizeof (msg->addr) == iaddr_size
&& memcmp (iaddr_bytes, &msg->addr, sizeof (msg->addr)))
skip_packet = TRUE;
}
#endif
#ifdef IPV6_PKTINFO
if (GST_IS_IPV6_PKTINFO_MESSAGE (msgs[i])) {
GstIPV6PktinfoMessage *msg = GST_IPV6_PKTINFO_MESSAGE (msgs[i]);
if (GST_IS_IPV6_PKTINFO_MESSAGE (msgs[i])) {
GstIPV6PktinfoMessage *msg = GST_IPV6_PKTINFO_MESSAGE (msgs[i]);
if (sizeof (msg->addr) == iaddr_size
&& memcmp (iaddr_bytes, &msg->addr, sizeof (msg->addr)))
skip_packet = TRUE;
}
if (sizeof (msg->addr) == iaddr_size
&& memcmp (iaddr_bytes, &msg->addr, sizeof (msg->addr)))
skip_packet = TRUE;
}
#endif
#ifdef IP_RECVDSTADDR
if (GST_IS_IP_RECVDSTADDR_MESSAGE (msgs[i])) {
GstIPRecvdstaddrMessage *msg = GST_IP_RECVDSTADDR_MESSAGE (msgs[i]);
if (GST_IS_IP_RECVDSTADDR_MESSAGE (msgs[i])) {
GstIPRecvdstaddrMessage *msg = GST_IP_RECVDSTADDR_MESSAGE (msgs[i]);
if (sizeof (msg->addr) == iaddr_size
&& memcmp (iaddr_bytes, &msg->addr, sizeof (msg->addr)))
skip_packet = TRUE;
}
#endif
if (sizeof (msg->addr) == iaddr_size
&& memcmp (iaddr_bytes, &msg->addr, sizeof (msg->addr)))
skip_packet = TRUE;
}
#endif
}
for (i = 0; i < n_msgs; i++) {