Add c_protocol to slap_conn to track protocol version used by client.

Is initialized to 0 (unknown) and then set to 2 or 3 on bind.  Should
also be 0->3 if a special (or any) operation occurs before the bind.

servers/slapd/bind.c

@@ -135,6 +135,8 @@ do_bind(
 			free( cred.bv_val );
 		}
 
+		conn->c_protocol = version;
+
 		send_ldap_result( conn, op, LDAP_SUCCESS, NULL, NULL );
 		return;
 	}
@@ -152,6 +154,7 @@ do_bind(
 			free( cred.bv_val );
 		}
 		if ( cred.bv_len == 0 ) {
+			conn->c_protocol = version;
 			send_ldap_result( conn, op, LDAP_SUCCESS,
 				NULL, NULL );
 		} else if ( default_referral && *default_referral ) {
@@ -173,6 +176,8 @@ do_bind(
 		if ( (*be->be_bind)( be, conn, op, ndn, method, &cred, &edn ) == 0 ) {
 			pthread_mutex_lock( &conn->c_dnmutex );
 
+			conn->c_protocol = version;
+
 			if ( conn->c_cdn != NULL ) {
 				free( conn->c_cdn );
 			}

servers/slapd/result.c

@@ -455,6 +455,7 @@ close_connection( Connection *conn, int opconnid, int opid )
 		close( conn->c_sb.sb_sd );
 		conn->c_sb.sb_sd = -1;
 		conn->c_version = 0;
+		conn->c_protocol = 0;
 	}
 	pthread_mutex_unlock( &new_conn_mutex );
 }

servers/slapd/slap.h

@@ -319,6 +319,7 @@ typedef struct slap_conn {
 	char		*c_cdn;		/* DN provided by the client */
 	char		*c_dn;		/* DN bound to this conn  */
 	pthread_mutex_t	c_dnmutex;	/* mutex for c_dn field		  */
+	int		c_protocol;	/* version of the LDAP protocol used by client */
 	int		c_authtype;	/* auth method used to bind c_dn  */
 #ifdef LDAP_COMPAT
 	int		c_version;	/* for compatibility w/2.0, 3.0	  */