Implement DLTClient for UDP multicast (#240)

* Add UDP multicast support on client side

UDP multicast support is already present on server side. This
patch add seemless support for UDP multicast on client side
in dlt-receive.

Signed-off-by: Joao Sousa <joao.sa.sousa@ctw.bmwgroup.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/src/shared/dlt_common.c b/src/shared/dlt_common.c
index eb620f5..823bca7 100644
--- a/src/shared/dlt_common.c
+++ b/src/shared/dlt_common.c
@@ -2014,6 +2014,8 @@ DltReturnValue dlt_receiver_free_unix_socket(DltReceiver *receiver)
 
 int dlt_receiver_receive(DltReceiver *receiver, DltReceiverType from_src)
 {
+    socklen_t addrlen;
+
     if (receiver == NULL)
         return -1;
 
@@ -2035,12 +2037,23 @@ int dlt_receiver_receive(DltReceiver *receiver, DltReceiverType from_src)
                                    receiver->buf + receiver->lastBytesRcvd,
                                    receiver->buffersize - receiver->lastBytesRcvd,
                                    0);
-    else
+    else if (from_src == DLT_RECEIVE_FD)
         /* wait for data from fd */
         receiver->bytesRcvd = read(receiver->fd,
                                    receiver->buf + receiver->lastBytesRcvd,
                                    receiver->buffersize - receiver->lastBytesRcvd);
 
+    else {
+        /* wait for data from UDP socket */
+        addrlen = sizeof(receiver->addr);
+        receiver->bytesRcvd = recvfrom(receiver->fd,
+                                       receiver->buf + receiver->lastBytesRcvd,
+                                       receiver->buffersize - receiver->lastBytesRcvd,
+                                       0,
+                                       (struct sockaddr *)&(receiver->addr),
+                                       &addrlen);
+    }
+
     if (receiver->bytesRcvd <= 0) {
         receiver->bytesRcvd = 0;