Improve the handling of out of the blue packets.

When injecting out of the blue packet, don't update the socket under test
if one is available. This allows to use the python code for TCP info to
inspect closed sockets.

Sponsored by:	Netflix.

gtests/net/packetdrill/run_packet.c

@@ -3274,24 +3274,17 @@ static int do_inbound_script_packet(
 			packet_payload_len(live_packet);
 	}
 
-	if (live_packet->ipv4 != NULL) {
-		if (live_packet->ipv4->src_ip.s_addr == 0) {
-			DEBUGP("live_packet->ipv4->src_ip.s_addr == 0\n");
-			state->socket_under_test = setup_new_child_socket(state, packet);
+	if ((state->socket_under_test == NULL) &&
+	    (((live_packet->ipv4 != NULL) &&
+	      (live_packet->ipv4->src_ip.s_addr == htonl(INADDR_ANY))) ||
+	     ((live_packet->ipv6 != NULL) &&
+	      (IN6_IS_ADDR_UNSPECIFIED(&live_packet->ipv6->src_ip))))) {
 			struct tuple live_inbound;
-			socket_get_inbound(&state->socket_under_test->live, &live_inbound);
-			set_packet_tuple(live_packet, &live_inbound);
-		}
-	}
 
-	if (live_packet->ipv6 != NULL) {
-		if (IN6_IS_ADDR_UNSPECIFIED(&live_packet->ipv6->src_ip)) {
-			DEBUGP("live_packet->ipv6->src_ip.s_addr == 0\n");
+			DEBUGP("live_packet has wildcard source address\n");
 			state->socket_under_test = setup_new_child_socket(state, packet);
-			struct tuple live_inbound;
 			socket_get_inbound(&state->socket_under_test->live, &live_inbound);
 			set_packet_tuple(live_packet, &live_inbound);
-		}
 	}
 
 	/* Inject live packet into kernel. */