From Holger Pfrommer via http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2205

This is a new dissector plugin for Hilscher analyzer frames.
These frames are generated by Hilscher analyzer products and are identified via
their unique source MAC address (this is a reserved MAC from Hilscher-range and
will never be used by another network device). Most likely these frames are
only generated on a virtual network interface or the generating device is
attached directly via patch cable to a real network interface, but not routed
through a network. The Ethernet-header (destination MAC, source MAC and
Length/Type) is not displayed in the protocol tree for these frames as this is
overhead-information which has no practical use in this case.

Note:

This is a heuristic Ethernet dissector which means it gets called for every
Ethernet frame.  So as to not cause a performance hit for most Wireshark users
it has a preference which, by default, disables the dissector.

svn path=/trunk/; revision=24495

1 files changed, 234 insertions, 0 deletions

diff --git a/epan/dissectors/packet-hilscher.c b/epan/dissectors/packet-hilscher.c
new file mode 100644
index 0000000000..c51a490455
--- /dev/null
+++ b/epan/dissectors/packet-hilscher.c
@@ -0,0 +1,234 @@
+/* packet-hilscher.c
+ * Dissector for Hilscher analyzer protocols.
+ * Copyright 2008, Hilscher GmbH, Holger Pfrommer hpfrommer[AT]hilscher.com
+ *
+ * $Id$
+ *
+ * This is a new dissector plugin for Hilscher analyzer frames.
+ * These frames are generated by Hilscher analyzer products and are identified via
+ * their unique source MAC address (this is a reserved MAC from Hilscher-range and
+ * will never be used by another network device). Most likely these frames are
+ * only generated on a virtual network interface or the generating device is
+ * attached directly via patch cable to a real network interface, but not routed
+ * through a network. The Ethernet-header (destination MAC, source MAC and
+ * Length/Type) is not displayed in the protocol tree for these frames as this is
+ * overhead-information which has no practical use in this case.
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald[AT]wireshark.org>
+ * Copyright 1999 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.
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <glib.h>
+#include <epan/packet.h>
+#include <epan/prefs.h>
+
+
+static int  proto_hilscher              = -1;
+static module_t *hilscher_module;
+
+/*  Ethernet heuristic dissectors (such as this one) get called for
+ *  every Ethernet frame Wireshark handles.  In order to not impose that
+ *  performance penalty on everyone this dissector disables itself by
+ *  default.
+ *
+ *  This is done separately from the disabled protocols list mainly so
+ *  we can disable it by default.  XXX Maybe there's a better way.
+ */
+static int  hilscher_enable_dissector = FALSE;
+
+void proto_reg_handoff_hilscher(void);
+
+static gint ett_information_type        = -1;
+static gint ett_gpio_number             = -1;
+static gint ett_gpio_edge               = -1;
+
+static int  hf_information_type         = -1;
+static int  hf_gpio_number              = -1;
+static int  hf_gpio_edge                = -1;
+
+#define  INFO_TYPE_OFFSET    14
+
+static const value_string information_type[] = {
+	{ 0x0, "netANALYZER GPIO event" },
+	{ 0,   NULL }
+};
+
+static const value_string gpio_number[] = {
+	{ 0x0, "GPIO 0" },
+	{ 0x1, "GPIO 1" },
+	{ 0x2, "GPIO 2" },
+	{ 0x3, "GPIO 3" },
+	{ 0,   NULL }
+};
+
+static const value_string gpio_edge[] = {
+	{ 0x0, "positive edge" },
+	{ 0x1, "negative edge" },
+	{ 0,   NULL }
+};
+
+/* netANAYLZER dissector */
+static void
+dissect_hilscher_netanalyzer(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint offset)
+{
+	proto_item  *ti        = NULL;
+	guint       gpio_num;
+	guint       gpio_edge;
+	guchar      *szInfo    = NULL;
+
+	#define MAX_BUFFER 60
+	szInfo=ep_alloc(MAX_BUFFER);
+	szInfo[0]=0;
+
+	if (check_col(pinfo->cinfo, COL_PROTOCOL))
+		col_set_str(pinfo->cinfo, COL_PROTOCOL, "netANALYZER");
+
+	if (tree)
+		ti = proto_tree_add_item(tree, hf_information_type, tvb, offset, 1, FALSE);
+
+	/* GPIO NUMBER */
+	offset++;
+	if (tree)
+		ti = proto_tree_add_item (tree, hf_gpio_number, tvb, offset, 1, FALSE);
+	gpio_num = (tvb_get_guint8(tvb, offset) & 0x03);
+
+	/* GPIO EDGE */
+	offset++;
+	if (tree)
+		ti = proto_tree_add_item (tree, hf_gpio_edge, tvb, offset, 1, FALSE);
+	gpio_edge = (tvb_get_guint8(tvb, offset) & 0x01);
+
+	if (gpio_edge == 0x00)
+		g_snprintf(szInfo, MAX_BUFFER, "netANALYZER event on GPIO %d (positive edge)", gpio_num);
+	else
+		g_snprintf(szInfo, MAX_BUFFER, "netANALYZER event on GPIO %d (negative edge)", gpio_num);
+
+	if (check_col(pinfo->cinfo, COL_INFO))
+		col_add_str(pinfo->cinfo, COL_INFO, szInfo);
+}
+
+
+/* General Hilscher analyzer dissector */
+static gboolean
+dissect_hilscher_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+	guint       info_type;
+	gint        offset;
+
+ 	/* Check that there's enough data */
+	if (tvb_length(tvb) < 14)
+		return FALSE;
+
+	/* check for Hilscher frame, this has a unique source MAC from Hilscher range and ethertype 0x88ff
+	   First 14 bytes must be: xx xx xx xx xx xx 00 02 a2 ff ff ff 88 ff */
+	if ((tvb_get_guint8(tvb, 6) == 0x00) &&
+	    (tvb_get_guint8(tvb, 7) == 0x02) &&
+	    (tvb_get_guint8(tvb, 8) == 0xa2) &&
+	    (tvb_get_guint8(tvb, 9) == 0xff) &&
+	    (tvb_get_guint8(tvb, 10) == 0xff) &&
+	    (tvb_get_guint8(tvb, 11) == 0xff) &&
+	    (tvb_get_guint8(tvb, 12) == 0x88) &&
+	    (tvb_get_guint8(tvb, 13) == 0xff) )
+	{
+
+		/* determine type of analyzer */
+		offset = INFO_TYPE_OFFSET;
+		info_type = tvb_get_guint8(tvb, offset);
+
+		switch (info_type)
+		{
+		/* this is a netANALYZER frame */
+		case 0x00:
+			dissect_hilscher_netanalyzer(tvb, pinfo, tree, offset);
+			break;
+
+		/* this is no Hilscher analyzer frame */
+		default:
+			return FALSE;
+			break;
+		}
+
+	}
+	else
+	{
+		/* this is no Hilscher analyzer frame */
+		return FALSE;
+	}
+
+	  return TRUE;
+}
+
+
+
+void proto_register_hilscher(void)
+{
+  static hf_register_info hf[] = {
+	{ &hf_information_type,
+	  { "Hilscher information block type", "hilscher.information_type",
+	    FT_UINT8, BASE_HEX, VALS(information_type), 0x0, "", HFILL }
+	},
+	{ &hf_gpio_number,
+	  { "Event on", "hilscher.net_analyzer.gpio_number", FT_UINT8,
+	    BASE_HEX, VALS(gpio_number), 0x0, "", HFILL }
+	},
+	{ &hf_gpio_edge,
+		{ "Event type", "hilscher.net_analyzer.gpio_edge", FT_UINT8,
+		  BASE_HEX, VALS(gpio_edge), 0x0, "", HFILL }
+	},
+  };
+
+  static gint *ett[] = {
+	&ett_information_type,
+	&ett_gpio_number,
+	&ett_gpio_edge,
+  };
+
+    if (proto_hilscher == -1)
+    {
+ 	proto_hilscher = proto_register_protocol ("Hilscher analyzer dissector",	/* name */
+						  "Hilscher",		/* short name */
+						  "Hilscher");		/* abbrev */
+    }
+
+    hilscher_module = prefs_register_protocol(proto_hilscher, proto_reg_handoff_hilscher);
+
+    prefs_register_bool_preference(hilscher_module, "enable", "Enable dissector",
+				   "Enable this dissector (default is false)",
+				   &hilscher_enable_dissector);
+
+    proto_register_field_array(proto_hilscher, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+
+}
+
+void proto_reg_handoff_hilscher(void)
+{
+    static int prefs_initialized = FALSE;
+
+    if (!prefs_initialized) {
+	/* add heuristic dissector */
+	heur_dissector_add("eth", dissect_hilscher_heur, proto_hilscher);
+    }
+
+    proto_set_decoding(proto_hilscher, hilscher_enable_dissector);
+}