Use IP_RECVDSTADDR in absence of IP_PKTINFO

On FreeBSD-like network stacks, the socket option IP_PKTINFO is unavailable, but the option IP_RECVDSTADDR can be used instead.

This enables vsomeip for the new io-sock network stack on QNX 7.1+.

Co-author: Eric Sjöström <[email protected]> @EriComic
Change-Id: Ie348a09dabf9b48c5de9e5d2d7bf13c1e2973449

Author: danielfr-haleytek

implementation/endpoints/src/udp_server_endpoint_impl.cpp

@@ -862,7 +862,13 @@ udp_server_endpoint_impl::set_multicast_option(
             int its_pktinfo_option(1);
             ::setsockopt(multicast_socket_->native_handle(),
                     (is_v4_ ? IPPROTO_IP : IPPROTO_IPV6),
+#if defined(IP_PKTINFO)
                     (is_v4_ ? IP_PKTINFO : IPV6_RECVPKTINFO),
+#elif defined(IP_RECVDSTADDR)
+                    (is_v4_ ? IP_RECVDSTADDR : IPV6_RECVPKTINFO),
+#else
+                    #error "Platform not supported. Neither IP_PKTINFO nor IP_RECVDSTADDR is defined.";
+#endif
                     &its_pktinfo_option, sizeof(its_pktinfo_option));
 #endif
 

implementation/helper/boost/asio/detail/impl/socket_ops_ext.ipp

@@ -96,6 +96,7 @@ signed_size_type recvfrom(socket_type s, buf* bufs, size_t count,
 		 cmsg != NULL;
 	  	 cmsg = CMSG_NXTHDR(&msg, cmsg))
 	{
+#if defined(IP_PKTINFO)
 	  if (cmsg->cmsg_level != IPPROTO_IP || cmsg->cmsg_type != IP_PKTINFO)
 	  	continue;
 
@@ -104,6 +105,18 @@ signed_size_type recvfrom(socket_type s, buf* bufs, size_t count,
 	  {
 	    da = boost::asio::ip::address_v4(ntohl(pi->ipi_addr.s_addr));
 	  } 
+#elif defined(IP_RECVDSTADDR)
+	  if (cmsg->cmsg_level != IPPROTO_IP || cmsg->cmsg_type != IP_RECVDSTADDR)
+	  	continue;
+
+    struct in_addr *addr = (struct in_addr*) CMSG_DATA(cmsg);
+    if (addr)
+    {
+      da = boost::asio::ip::address_v4(ntohl(addr->s_addr));
+    }
+#else
+    #error "Platform not supported. Neither IP_PKTINFO nor IP_RECVDSTADDR is defined.";
+#endif
 	}      
   }
   return result;