New dissector for Character Generator Protocol (chargen).

Change-Id: I01e0508adc79dda11b3eaee51fa01110b8c83e39
Bug: 10178
Reviewed-on: https://code.wireshark.org/review/2220
Reviewed-by: Bill Meier <wmeier@newsguy.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/epan/dissectors/packet-chargen.c b/epan/dissectors/packet-chargen.c
new file mode 100644
index 0000000000..f8dcb5e4a0
--- /dev/null
+++ b/epan/dissectors/packet-chargen.c
@@ -0,0 +1,114 @@
+/* packet-chargen.c
+ * Routines for chargen packet dissection
+ * Copyright 2014, Dario Lombardo <lomato@gmail.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * Chargen specs taken from RFC 864
+ * http://tools.ietf.org/html/rfc864
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include "config.h"
+
+#include <glib.h>
+
+#include <epan/packet.h>
+#include <epan/wmem/wmem.h>
+
+#define CHARGEN_PORT_UDP 19
+#define CHARGEN_PORT_TCP 19
+
+void proto_register_chargen(void);
+void proto_reg_handoff_chargen(void);
+
+static int proto_chargen = -1;
+
+static int hf_chargen_data = -1;
+
+static gint ett_chargen = -1;
+
+/* dissect_chargen - dissects chargen packet data
+ * tvb - tvbuff for packet data (IN)
+ * pinfo - packet info
+ * proto_tree - resolved protocol tree
+ */
+static void
+dissect_chargen(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+	proto_tree* chargen_tree;
+	proto_item* ti = NULL;
+	guint8* data;
+	guint32 len;
+
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "Chargen");
+	col_set_str(pinfo->cinfo, COL_INFO, "Chargen");
+
+	ti = proto_tree_add_item(tree, proto_chargen, tvb, 0, -1, ENC_NA);
+	chargen_tree = proto_item_add_subtree(ti, ett_chargen);
+
+	len = tvb_reported_length(tvb);
+	data = tvb_get_string_enc(wmem_packet_scope(), tvb, 0, len, ENC_ASCII);
+
+	proto_tree_add_string_format(chargen_tree, hf_chargen_data, tvb, 0,
+		len, "Data", "Data (%u): %s", len, data);
+
+/*	proto_tree_add_item(chargen_tree, hf_chargen_data, tvb, 0, -1, ENC_BIG_ENDIAN); */
+}
+
+void
+proto_register_chargen(void)
+{
+	static hf_register_info hf[] = {
+		{ &hf_chargen_data, {
+			"Data", "chargen.data", FT_STRING, BASE_NONE,
+			NULL, 0, NULL, HFILL }}
+		};
+
+	static gint *ett[] = {
+		&ett_chargen,
+	};
+
+	proto_chargen = proto_register_protocol("Character Generator Protocol", "chargen",
+	    "chargen");
+	proto_register_field_array(proto_chargen, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+}
+
+void
+proto_reg_handoff_chargen(void)
+{
+	dissector_handle_t chargen_handle;
+
+	chargen_handle = create_dissector_handle(dissect_chargen, proto_chargen);
+	dissector_add_uint("udp.port", CHARGEN_PORT_UDP, chargen_handle);
+	dissector_add_uint("tcp.port", CHARGEN_PORT_TCP, chargen_handle);
+}
+
+/*
+ * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */