![Guy Harris](/assets/img/avatar_default.png)
it serves the same purpose as the register routine in a built-in dissector, and don't require all dissectors to have one, as they might just be taps. Get rid of the stats tree's init routine, as it's just a tap, and as it doesn't do anything. Update the idl2eth Python script to generate plugins with register routines. svn path=/trunk/; revision=13644
252 lines
6.4 KiB
C
252 lines
6.4 KiB
C
/* packet-rudp.c
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* Routines for Reliable UDP Protocol.
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* Copyright 2004, Duncan Sargeant <dunc-ethereal@rcpt.to>
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-data.c, README.developer, and various other files.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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* Reliable UDP is a lightweight protocol for providing TCP-like flow
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* control over UDP. Cisco published an PFC a long time ago, and
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* their actual implementation is slightly different, having no
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* checksum field.
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*
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* I've cheated here - RUDP could be used for anything, but I've only
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* seen it used to switched telephony calls, so we just call the Cisco SM
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* dissector from here.
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*
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* Here are some links:
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*
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* http://www.watersprings.org/pub/id/draft-ietf-sigtran-reliable-udp-00.txt
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* http://www.javvin.com/protocolRUDP.html
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* http://www.cisco.com/univercd/cc/td/doc/product/access/sc/rel7/omts/omts_apb.htm#30052
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gmodule.h>
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#include <epan/packet.h>
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/* Define version if we are not building ethereal statically */
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#include "moduleinfo.h"
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#ifndef ENABLE_STATIC
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G_MODULE_EXPORT const gchar version[] = VERSION;
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#endif
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static int proto_rudp = -1;
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static int hf_rudp_flags = -1;
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static int hf_rudp_flags_syn = -1;
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static int hf_rudp_flags_ack = -1;
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static int hf_rudp_flags_eak = -1;
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static int hf_rudp_flags_rst = -1;
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static int hf_rudp_flags_nul = -1;
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static int hf_rudp_flags_chk = -1;
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static int hf_rudp_flags_tcs = -1;
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static int hf_rudp_flags_0 = -1;
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static int hf_rudp_hlen = -1;
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static int hf_rudp_seq = -1;
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static int hf_rudp_ack = -1;
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/* static int hf_rudp_cksum = -1; */
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static gint ett_rudp = -1;
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static gint ett_rudp_flags = -1;
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static void
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dissect_rudp(tvbuff_t *tvb, packet_info *pinfo _U_ , proto_tree *tree)
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{
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tvbuff_t * next_tvb = NULL;
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proto_tree *rudp_tree = NULL, *flags_tree;
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proto_item *ti = NULL;
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int flags[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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int i;
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guint8 hlen;
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flags[0] = hf_rudp_flags_syn;
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flags[1] = hf_rudp_flags_ack;
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flags[2] = hf_rudp_flags_eak;
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flags[3] = hf_rudp_flags_rst;
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flags[4] = hf_rudp_flags_nul;
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flags[5] = hf_rudp_flags_chk;
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flags[6] = hf_rudp_flags_tcs;
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flags[7] = hf_rudp_flags_0;
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hlen = tvb_get_guint8(tvb, 1);
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RUDP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_rudp, tvb, 0, hlen, FALSE);
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rudp_tree = proto_item_add_subtree(ti, ett_rudp);
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ti = proto_tree_add_item(rudp_tree, hf_rudp_flags, tvb, 0, 1, FALSE);
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flags_tree = proto_item_add_subtree(ti, ett_rudp_flags);
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for (i = 0; i < 8; i++)
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proto_tree_add_item(flags_tree, flags[i], tvb, 0, 1, FALSE);
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proto_tree_add_item(rudp_tree, hf_rudp_hlen, tvb, 1, 1, FALSE);
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proto_tree_add_item(rudp_tree, hf_rudp_seq, tvb, 2, 1, FALSE);
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proto_tree_add_item(rudp_tree, hf_rudp_ack, tvb, 3, 1, FALSE);
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}
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next_tvb = tvb_new_subset(tvb, hlen, -1, -1);
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if (tvb_length(next_tvb) && find_dissector("sm"))
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call_dissector(find_dissector("sm"), next_tvb, pinfo, tree);
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}
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void
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proto_register_rudp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_rudp_flags,
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{ "RUDP Header flags", "rudp.flags",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_rudp_flags_syn,
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{ "Syn", "rudp.flags.syn",
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FT_BOOLEAN, 8, NULL, 0x80,
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"", HFILL }
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},
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{ &hf_rudp_flags_ack,
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{ "Ack", "rudp.flags.ack",
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FT_BOOLEAN, 8, NULL, 0x40,
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"", HFILL }
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},
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{ &hf_rudp_flags_eak,
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{ "Eak", "rudp.flags.eak",
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FT_BOOLEAN, 8, NULL, 0x20,
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"Extended Ack", HFILL }
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},
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{ &hf_rudp_flags_rst,
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{ "RST", "rudp.flags.rst",
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FT_BOOLEAN, 8, NULL, 0x10,
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"Reset flag", HFILL }
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},
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{ &hf_rudp_flags_nul,
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{ "NULL", "rudp.flags.nul",
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FT_BOOLEAN, 8, NULL, 0x08,
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"Null flag", HFILL }
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},
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{ &hf_rudp_flags_chk,
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{ "CHK", "rudp.flags.chk",
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FT_BOOLEAN, 8, NULL, 0x04,
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"Checksum is on header or body", HFILL }
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},
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{ &hf_rudp_flags_tcs,
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{ "TCS", "rudp.flags.tcs",
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FT_BOOLEAN, 8, NULL, 0x02,
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"Transfer Connection System", HFILL }
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},
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{ &hf_rudp_flags_0,
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{ "0", "rudp.flags.0",
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FT_BOOLEAN, 8, NULL, 0x01,
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"", HFILL }
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},
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{ &hf_rudp_hlen,
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{ "Header Length", "rudp.hlen",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_rudp_seq,
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{ "Seq", "rudp.seq",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Sequence Number", HFILL }
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},
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{ &hf_rudp_ack,
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{ "Ack", "rudp.ack",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Acknowledgement Number", HFILL }
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},
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/*
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A checksum is specified in the RFC, but Cisco don't use one.
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{ &hf_rudp_cksum,
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{ "Checksum", "rudp.cksum",
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FT_UINT16, 8, NULL, 0x0,
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"", HFILL }
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},
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*/
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_rudp,
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&ett_rudp_flags,
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};
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if (proto_rudp == -1) {
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proto_rudp = proto_register_protocol (
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"Reliable UDP", /* name */
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"RUDP", /* short name */
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"rudp" /* abbrev */
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);
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}
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proto_register_field_array(proto_rudp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_rudp(void) {
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static dissector_handle_t rudp_handle = NULL;
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if (!rudp_handle) {
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rudp_handle = create_dissector_handle(dissect_rudp, proto_rudp);
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}
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dissector_add("udp.port", 7000, rudp_handle);
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}
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#ifndef ENABLE_STATIC
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G_MODULE_EXPORT void
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plugin_register(void)
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{
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/* register the new protocol, protocol fields, and subtrees */
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if (proto_rudp == -1) { /* execute protocol initialization only once */
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proto_register_rudp();
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}
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}
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G_MODULE_EXPORT void
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plugin_reg_handoff(void){
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proto_reg_handoff_rudp();
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}
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#endif
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