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, 20 insertions, 5 deletions

diff --git a/src/ipcpd/local/main.c b/src/ipcpd/local/main.c
index 192607c1..b8783d9d 100644
--- a/src/ipcpd/local/main.c
+++ b/src/ipcpd/local/main.c
@@ -20,17 +20,18 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#define OUROBOROS_PREFIX "ipcpd/local"
+
 #include <ouroboros/config.h>
-#include "ipcp.h"
+#include <ouroboros/logs.h>
 #include <ouroboros/errno.h>
 #include <ouroboros/dev.h>
 #include <ouroboros/fcntl.h>
 #include <ouroboros/fqueue.h>
 #include <ouroboros/ipcp-dev.h>
 #include <ouroboros/local-dev.h>
-#define OUROBOROS_PREFIX "ipcpd/local"
 
-#include <ouroboros/logs.h>
+#include "ipcp.h"
 
 #include <string.h>
 #include <signal.h>
@@ -176,7 +177,7 @@ static int ipcp_local_name_reg(char * name)
 {
         pthread_rwlock_rdlock(&ipcpi.state_lock);
 
-        if (ipcp_data_add_reg_entry(ipcpi.data, name)) {
+        if (ipcp_data_reg_add_entry(ipcpi.data, name)) {
                 pthread_rwlock_unlock(&ipcpi.state_lock);
                 LOG_DBG("Failed to add %s to local registry.", name);
                 return -1;
@@ -193,7 +194,7 @@ static int ipcp_local_name_unreg(char * name)
 {
         pthread_rwlock_rdlock(&ipcpi.state_lock);
 
-        ipcp_data_del_reg_entry(ipcpi.data, name);
+        ipcp_data_reg_del_entry(ipcpi.data, name);
 
         pthread_rwlock_unlock(&ipcpi.state_lock);
 
@@ -202,6 +203,19 @@ static int ipcp_local_name_unreg(char * name)
         return 0;
 }
 
+static int ipcp_local_name_query(char * name)
+{
+        int ret;
+
+        pthread_rwlock_rdlock(&ipcpi.state_lock);
+
+        ret = (ipcp_data_reg_has(ipcpi.data, name) ? 0 : -1);
+
+        pthread_rwlock_unlock(&ipcpi.state_lock);
+
+        return ret;
+}
+
 static int ipcp_local_flow_alloc(int           fd,
                                  char *        dst_name,
                                  char *        src_ae_name,
@@ -302,6 +316,7 @@ static struct ipcp_ops local_ops = {
         .ipcp_enroll          = NULL,                       /* shim */
         .ipcp_name_reg        = ipcp_local_name_reg,
         .ipcp_name_unreg      = ipcp_local_name_unreg,
+        .ipcp_name_query      = ipcp_local_name_query,
         .ipcp_flow_alloc      = ipcp_local_flow_alloc,
         .ipcp_flow_alloc_resp = ipcp_local_flow_alloc_resp,
         .ipcp_flow_dealloc    = ipcp_local_flow_dealloc