bool NetlinkListener::onDataAvailable(SocketClient *cli)
{
int socket = cli->getSocket();
ssize_t count;
uid_t uid = -1;
bool require_group = true;
if (mFormat == NETLINK_FORMAT_BINARY_UNICAST) {
require_group = false;
}
count = TEMP_FAILURE_RETRY(uevent_kernel_recv(socket,
mBuffer, sizeof(mBuffer), require_group, &uid));
if (count < 0) {
if (uid > 0)
LOG_EVENT_INT(65537, uid);
SLOGE("recvmsg failed (%s)", strerror(errno));
return false;
}
NetlinkEvent *evt = new NetlinkEvent();
if (evt->decode(mBuffer, count, mFormat)) {
onEvent(evt);
} else if (mFormat != NETLINK_FORMAT_BINARY) {
// Don't complain if parseBinaryNetlinkMessage returns false. That can
// just mean that the buffer contained no messages we're interested in.
SLOGE("Error decoding NetlinkEvent");
}
delete evt;
return true;
}
/**
* Like the above, but passes a uid_t in by pointer. In the event that this
* fails due to a bad uid check, the uid_t will be set to the uid of the
* socket's peer.
*
* If this method rejects a netlink message from outside the kernel, it
* returns -1, sets errno to EIO, and sets "user" to the UID associated with the
* message. If the peer UID cannot be determined, "user" is set to -1."
*/
ssize_t uevent_kernel_multicast_uid_recv(int socket, void *buffer, size_t length, uid_t *uid)
{
return uevent_kernel_recv(socket, buffer, length, true, uid);
}
