Add file missing from http://anonsvn.wireshark.org/viewvc/viewvc.cgi?view=rev&revision=42806

svn path=/trunk/; revision=42809

1 files changed, 48 insertions, 0 deletions

diff --git a/epan/conv_id.h b/epan/conv_id.h
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+/* conv_id.h
+ * conv_id   2011 Robert Bullen
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifndef __CONV_ID_H__
+#define __CONV_ID_H__
+
+/** conv_id_t is a type that can aid in conversation identification. When
+ *  included in a "conversation key", whatever that may be, in addition to the
+ *  typical { address, port, address, port } quadruple, it helps differentiate
+ *  in case the quadruple is not sufficiently unique. For example, it is not
+ *  uncommon to see a TCP quadruple reused these days, and employing a
+ *  conv_id_t field ensures that each instance of a reused TCP conversation is
+ *  tracked independently. Currently this type is used in both Wireshark's and
+ *  tshark's conversation tables implementations (they are different, hence
+ *  the need for a whole header file for this one silly type alias).
+ *
+ *  The "protocol" or "statistic" code responsible for instantiating the
+ *  "conversation key" is also responsible for assigning its conv_id_t, and
+ *  therefore its interpretation is specific to its assignor. For example, the
+ *  TCP conversations tables in Wireshark and tshark assign the value of
+ *  tcp.stream. If a conv_id_t field is not used, it should be assigned the
+ *  value CONV_ID_UNSET.
+ */
+typedef guint32 conv_id_t;
+#define CONV_ID_UNSET G_MAXUINT32
+
+#endif /* __CONV_ID_H__ */