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diff --git a/src/mds-server/interception_condition.h b/src/mds-server/interception_condition.h
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+/**
+ * mds — A micro-display server
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef MDS_MDS_SERVER_INTERCEPTION_CONDITION_H
+#define MDS_MDS_SERVER_INTERCEPTION_CONDITION_H
+
+
+#include <stddef.h>
+#include <stdint.h>
+
+
+/**
+ * A condition for a message being intercepted by a client
+ */
+typedef struct interception_condition
+{
+  /**
+   * The header of messages to intercept, optionally with a value,
+   * empty (most not be NULL) for all messages.
+   */
+  char* condition;
+  
+  /**
+   * The hash of the header of messages to intercept
+   */
+  size_t header_hash;
+  
+  /**
+   * The interception priority. The client should be
+   * consistent with the priority for conditions that
+   * are not mutually exclusive.
+   */
+  int64_t priority;
+  
+  /**
+   * Whether the messages may get modified by the client
+   */
+  int modifying;
+  
+} interception_condition_t;
+
+
+/**
+ * Calculate the buffer size need to marshal an interception condition
+ * 
+ * @param   this  The interception condition
+ * @return        The number of bytes to allocate to the output buffer
+ */
+size_t interception_condition_marshal_size(const interception_condition_t* restrict this) __attribute__((pure));
+
+/**
+ * Marshals an interception condition
+ * 
+ * @param   this  The interception condition
+ * @param   data  Output buffer for the marshalled data
+ * @return        The number of bytes that have been written (everything will be written)
+ */
+size_t interception_condition_marshal(const interception_condition_t* restrict this, char* restrict data);
+
+/**
+ * Unmarshals an interception condition
+ * 
+ * @param   this  Memory slot in which to store the new interception condition
+ * @param   data  In buffer with the marshalled data
+ * @return        Zero on error, errno will be set accordingly, otherwise the number of read bytes.
+ *                Destroy the interception condition on error.
+ */
+size_t interception_condition_unmarshal(interception_condition_t* restrict this, char* restrict data);
+
+
+#endif
+