lib: Exchange protocol info during CACEP

This exchanges a protocol name, a protocol version and concrete syntax
for the protocol upon CACEP. For CDAP, only version 1 and GPB are
supported. No lists for other supported versions or syntaxes are
exchanged (but the proto file supports it). CACEP fails if there is a
mismatch between the protocol names, version and syntax specified by
the communicating parties.

2 files changed, 16 insertions, 0 deletions

diff --git a/include/ouroboros/cacep.h b/include/ouroboros/cacep.h
index 63418bd3..e0737c47 100644
--- a/include/ouroboros/cacep.h
+++ b/include/ouroboros/cacep.h
@@ -26,12 +26,27 @@
 
 #include <ouroboros/irm_config.h>
 
+enum proto_concrete_syntax {
+        PROTO_GPB = 0,
+        PROTO_ASN_1,
+        PROTO_FIXED
+};
+
 struct cacep_info {
+        struct {
+                char *                     protocol;
+                uint32_t                   pref_version;
+                enum proto_concrete_syntax pref_syntax;
+        }        proto;
         char *   name;
         uint64_t addr;
         void *   data;
 };
 
+int                 cacep_info_init(struct cacep_info * info);
+
+void                cacep_info_fini(struct cacep_info * info);
+
 struct cacep_info * cacep_auth(int                       fd,
                                enum pol_cacep            pc,
                                const struct cacep_info * info);
diff --git a/include/ouroboros/cdap.h b/include/ouroboros/cdap.h
index 9f6e2654..cc04cf27 100644
--- a/include/ouroboros/cdap.h
+++ b/include/ouroboros/cdap.h
@@ -31,6 +31,7 @@
 #define F_SYNC 0x0001
 
 #define INVALID_CDAP_KEY -1
+#define CDAP_PROTO "CDAP"
 
 enum cdap_opcode {
         CDAP_READ = 0,