Incorporate plugin dissector into build in collection.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@27496 f5534014-38df-0310-8fa8-9805f1628bb7

1 files changed, 271 insertions, 0 deletions

diff --git a/epan/dissectors/packet-rudp.c b/epan/dissectors/packet-rudp.c
new file mode 100644
index 0000000000..f6bfe18663
--- /dev/null
+++ b/epan/dissectors/packet-rudp.c
@@ -0,0 +1,271 @@
+/* packet-rudp.c
+ * Routines for Reliable UDP Protocol.
+ * Copyright 2004, Duncan Sargeant <dunc-ethereal@rcpt.to>
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * Copied from packet-data.c, README.developer, and various other files.
+ *
+ * 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.
+
+
+ * Reliable UDP is a lightweight protocol for providing TCP-like flow
+ * control over UDP.  Cisco published an PFC a long time ago, and
+ * their actual implementation is slightly different, having no
+ * checksum field.
+ *
+ * I've cheated here - RUDP could be used for anything, but I've only
+ * seen it used to switched telephony calls, so we just call the Cisco SM
+ * dissector from here.
+ *
+ * Here are some links:
+ * 
+ * http://www.watersprings.org/pub/id/draft-ietf-sigtran-reliable-udp-00.txt
+ * http://www.javvin.com/protocolRUDP.html
+ * http://www.cisco.com/univercd/cc/td/doc/product/access/sc/rel7/omts/omts_apb.htm#30052
+
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+#include <epan/packet.h>
+#include <epan/prefs.h>
+
+/* Disable rudp by default. The previously hardcoded value of
+ * 7000 (used by Cisco) collides with afs and as the draft states:
+ * "RUDP doesn't place any restrictions on which UDP port numbers are used.  
+ *  Valid port numbers are ports not defined in RFC 1700."
+ */
+/* FIXME: The proper solution would be to convert this dissector into
+ *        heuristic dissector, but it isn't complete anyway.
+ */
+static guint udp_port = 0;
+
+void proto_reg_handoff_rudp(void);
+
+static int proto_rudp = -1;
+
+static int hf_rudp_flags = -1;
+static int hf_rudp_flags_syn = -1;
+static int hf_rudp_flags_ack = -1;
+static int hf_rudp_flags_eak = -1;
+static int hf_rudp_flags_rst = -1;
+static int hf_rudp_flags_nul = -1;
+static int hf_rudp_flags_chk = -1;
+static int hf_rudp_flags_tcs = -1;
+static int hf_rudp_flags_0 = -1;
+static int hf_rudp_hlen = -1;
+static int hf_rudp_seq = -1;
+static int hf_rudp_ack = -1;
+static int hf_rudp_cksum = -1;
+
+static gint ett_rudp = -1;
+static gint ett_rudp_flags = -1;
+
+static dissector_handle_t sm_handle = NULL;
+static dissector_handle_t data_handle = NULL;
+
+
+static void
+dissect_rudp(tvbuff_t *tvb, packet_info *pinfo _U_ , proto_tree *tree)
+{
+	tvbuff_t * next_tvb = NULL;
+	proto_tree *rudp_tree = NULL, *flags_tree;
+	proto_item *ti = NULL;
+	int flags[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
+	int i;
+	guint8 hlen;
+
+	flags[0] = hf_rudp_flags_syn;
+	flags[1] = hf_rudp_flags_ack;
+	flags[2] = hf_rudp_flags_eak;
+	flags[3] = hf_rudp_flags_rst;
+	flags[4] = hf_rudp_flags_nul;
+	flags[5] = hf_rudp_flags_chk;
+	flags[6] = hf_rudp_flags_tcs;
+	flags[7] = hf_rudp_flags_0;
+
+	hlen = tvb_get_guint8(tvb, 1);
+
+	if (check_col(pinfo->cinfo, COL_PROTOCOL)) 
+		col_set_str(pinfo->cinfo, COL_PROTOCOL, "RUDP");
+	if (check_col(pinfo->cinfo, COL_INFO)) 
+		col_clear(pinfo->cinfo, COL_INFO);
+
+	if (tree) {
+		ti = proto_tree_add_item(tree, proto_rudp, tvb, 0, hlen, FALSE);
+		rudp_tree = proto_item_add_subtree(ti, ett_rudp);
+
+		ti = proto_tree_add_item(rudp_tree, hf_rudp_flags, tvb, 0, 1, FALSE);
+		flags_tree = proto_item_add_subtree(ti, ett_rudp_flags);
+
+		for (i = 0; i < 8; i++)
+			proto_tree_add_item(flags_tree, flags[i], tvb, 0, 1, FALSE);
+
+		proto_tree_add_item(rudp_tree, hf_rudp_hlen, tvb, 1, 1, FALSE);
+		proto_tree_add_item(rudp_tree, hf_rudp_seq, tvb, 2, 1, FALSE);
+		proto_tree_add_item(rudp_tree, hf_rudp_ack, tvb, 3, 1, FALSE);
+
+		/* If the header is more than 4 bytes the next 2 bytes are the checksum */
+		if (hlen > 4) {
+			proto_tree_add_item(rudp_tree, hf_rudp_cksum, tvb, 4, 2, FALSE);
+		}
+
+		/* If we have even more bytes their meaning is unknown - we have seen this
+		 * in live captures */
+		if (hlen > 6) {
+			next_tvb = tvb_new_subset(tvb, 6, hlen-6, hlen-6);
+			call_dissector(data_handle, next_tvb, pinfo, rudp_tree);
+		}
+	}
+
+	next_tvb = tvb_new_subset(tvb, hlen, -1, -1);
+	if (tvb_length(next_tvb) && sm_handle)
+		call_dissector(sm_handle, next_tvb, pinfo, tree);
+}
+
+void
+proto_register_rudp(void)
+{
+
+	static hf_register_info hf[] = {
+		{ &hf_rudp_flags,
+			{ "RUDP Header flags",           "rudp.flags",
+			FT_UINT8, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_rudp_flags_syn,
+			{ "Syn",           "rudp.flags.syn",
+			FT_BOOLEAN, 8, NULL, 0x80,
+			"", HFILL }
+		},
+		{ &hf_rudp_flags_ack,
+			{ "Ack",           "rudp.flags.ack",
+			FT_BOOLEAN, 8, NULL, 0x40,
+			"", HFILL }
+		},
+		{ &hf_rudp_flags_eak,
+			{ "Eak",           "rudp.flags.eak",
+			FT_BOOLEAN, 8, NULL, 0x20,
+			"Extended Ack", HFILL }
+		},
+		{ &hf_rudp_flags_rst,
+			{ "RST",           "rudp.flags.rst",
+			FT_BOOLEAN, 8, NULL, 0x10,
+			"Reset flag", HFILL }
+		},
+		{ &hf_rudp_flags_nul,
+			{ "NULL",           "rudp.flags.nul",
+			FT_BOOLEAN, 8, NULL, 0x08,
+			"Null flag", HFILL }
+		},
+		{ &hf_rudp_flags_chk,
+			{ "CHK",           "rudp.flags.chk",
+			FT_BOOLEAN, 8, NULL, 0x04,
+			"Checksum is on header or body", HFILL }
+		},
+		{ &hf_rudp_flags_tcs,
+			{ "TCS",           "rudp.flags.tcs",
+			FT_BOOLEAN, 8, NULL, 0x02,
+			"Transfer Connection System", HFILL }
+		},
+		{ &hf_rudp_flags_0,
+			{ "0",           "rudp.flags.0",
+			FT_BOOLEAN, 8, NULL, 0x01,
+			"", HFILL }
+		},
+		{ &hf_rudp_hlen,
+			{ "Header Length",           "rudp.hlen",
+			FT_UINT8, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_rudp_seq,
+			{ "Seq",           "rudp.seq",
+			FT_UINT8, BASE_DEC, NULL, 0x0,
+			"Sequence Number", HFILL }
+		},
+		{ &hf_rudp_ack,
+			{ "Ack",           "rudp.ack",
+			FT_UINT8, BASE_DEC, NULL, 0x0,
+			"Acknowledgement Number", HFILL }
+		},
+		{ &hf_rudp_cksum,
+			{ "Checksum",           "rudp.cksum",
+			FT_UINT16, BASE_HEX, NULL, 0x0,
+			"", HFILL }
+		},
+	};
+
+
+/* Setup protocol subtree array */
+	static gint *ett[] = {
+		&ett_rudp,
+		&ett_rudp_flags,
+	};
+
+
+	proto_rudp = proto_register_protocol (
+		"Reliable UDP",		/* name */
+		"RUDP",		/* short name */
+		"rudp"		/* abbrev */
+		);
+
+	proto_register_field_array(proto_rudp, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+	{
+		module_t *rudp_module;
+		rudp_module = prefs_register_protocol(proto_rudp, proto_reg_handoff_rudp);
+		prefs_register_uint_preference(rudp_module,
+			"udp.port",
+			"UDP port for RUDP",
+			"Set the UDP port for Reliable UDP traffic",
+			10,
+			&udp_port);
+	}
+
+}
+
+void
+proto_reg_handoff_rudp(void) {
+
+	static gboolean initialized = FALSE;
+	static dissector_handle_t rudp_handle;
+	static guint saved_udp_port;
+
+	if (!initialized) {
+		rudp_handle = create_dissector_handle(dissect_rudp, proto_rudp);
+		dissector_add_handle("udp.port", rudp_handle);  /* for "decode as" */
+		sm_handle = find_dissector("sm");
+		data_handle = find_dissector("data");
+		initialized = TRUE;
+	} else {
+		if (saved_udp_port != 0) {
+			dissector_delete("udp.port", saved_udp_port, rudp_handle);
+		}
+	}
+
+	if (udp_port != 0) {
+		dissector_add("udp.port", udp_port, rudp_handle);
+	}
+	saved_udp_port = udp_port;
+}