lib, irmd, ipcpd: Add name querying to IPCPs

This adds the ability to query IPCPs if a name can be reached through
them, e.g. if a name is available in a DIF. This means that in the
shim-udp a DNS query is performed, in the shim-eth-llc an ARP-like
query has been added, in the local a check is done to see if the name
is registered, and in the normal currently no application is reachable
through it.

1 files changed, 28 insertions, 4 deletions

diff --git a/src/irmd/ipcp.c b/src/irmd/ipcp.c
index 33f7650a..29327df4 100644
--- a/src/irmd/ipcp.c
+++ b/src/irmd/ipcp.c
@@ -20,15 +20,14 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#define OUROBOROS_PREFIX "irmd/ipcp"
+
 #include <ouroboros/config.h>
+#include <ouroboros/logs.h>
 #include <ouroboros/errno.h>
 #include <ouroboros/utils.h>
 #include <ouroboros/sockets.h>
 
-#define OUROBOROS_PREFIX "irmd/ipcp"
-
-#include <ouroboros/logs.h>
-
 #include "ipcp.h"
 
 #include <stdlib.h>
@@ -302,6 +301,31 @@ int ipcp_name_unreg(pid_t  api,
         return ret;
 }
 
+int ipcp_name_query(pid_t api,
+                    char * name)
+{
+        ipcp_msg_t msg = IPCP_MSG__INIT;
+        ipcp_msg_t * recv_msg = NULL;
+        int ret = -1;
+
+        msg.code = IPCP_MSG_CODE__IPCP_NAME_QUERY;
+        msg.name = name;
+
+        recv_msg = send_recv_ipcp_msg(api, &msg);
+        if (recv_msg == NULL)
+                return -1;
+
+        if (recv_msg->has_result == false) {
+                ipcp_msg__free_unpacked(recv_msg, NULL);
+                return -1;
+        }
+
+        ret = recv_msg->result;
+        ipcp_msg__free_unpacked(recv_msg, NULL);
+
+        return ret;
+}
+
 int ipcp_flow_alloc(pid_t         api,
                     int           port_id,
                     pid_t         n_api,