diff options
| author | Jens Georg <mail@jensge.org> | 2022-09-18 08:50:45 +0200 |
|---|---|---|
| committer | Jens Georg <mail@jensge.org> | 2022-09-18 08:50:45 +0200 |
| commit | 7ecb930d93714b34e751d63a1db47028a2bbf7fe (patch) | |
| tree | dce1f8923b32a8797d31f46011784b91988cece7 | |
| parent | 6eeaf27aec6ff11f325ff633b52bd56dbc1435aa (diff) | |
| download | gssdp-7ecb930d93714b34e751d63a1db47028a2bbf7fe.tar.gz | |
client: Do not accept multicast packets on lo
All multicast packets are also received on lo. If we answer those, we
cause the remote site to receive locations for the wrong addresses on
their lo interface.
This was added because of missing announcements previously, not sure
what exactly has changed since then
Fixes #24
| -rw-r--r-- | libgssdp/gssdp-client.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/libgssdp/gssdp-client.c b/libgssdp/gssdp-client.c index 60aeb06..a81f81d 100644 --- a/libgssdp/gssdp-client.c +++ b/libgssdp/gssdp-client.c @@ -1726,19 +1726,29 @@ socket_source_cb (GSSDPSocketSource *socket_source, GSSDPClient *client) msg = GSSDP_PKTINFO6_MESSAGE (messages[i]); msg_ifindex = gssdp_pktinfo6_message_get_ifindex (msg); local_addr = gssdp_pktinfo6_message_get_local_addr (msg); - } else + } else { continue; + } /* message needs to be on correct interface or on * loopback (as kernel can be smart and route things * there even if sent to another network) */ - if (!((msg_ifindex == priv->device.index || - msg_ifindex == LOOPBACK_IFINDEX) && - (g_inet_address_equal (local_addr, - priv->device.host_addr) || - g_inet_address_equal (local_addr, group_addr)))) { - goto out; - } else { + if (g_inet_address_equal (local_addr, group_addr)) { + // This is a multicast packet. If the index is not our index, ignore + if (msg_ifindex != priv->device.index) { + goto out; + } + break; + } + + if (g_inet_address_equal (local_addr, + priv->device.host_addr)) { + // This is a "normal" packet. We can receive those + + if (msg_ifindex != priv->device.index && + msg_ifindex != LOOPBACK_IFINDEX) { + goto out; + } break; } } |