forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
This saves many dissectors the need to find the data dissector and store a handle to it. There were also some that were finding it, but not using it. For others this was the only reason for their handoff function, so it could be eliminated. Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b Reviewed-on: https://code.wireshark.org/review/14530 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
282 lines
7.6 KiB
C
282 lines
7.6 KiB
C
/* packet-rmcp.c
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* Routines for RMCP packet dissection
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*
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* Duncan Laurie <duncan@sun.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-tftp.c
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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void proto_register_rmcp(void);
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void proto_register_rsp(void);
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void proto_reg_handoff_rmcp(void);
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void proto_reg_handoff_rsp(void);
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/*
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* See
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* http://www.dmtf.org/standards/standard_alert.php
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* http://www.dmtf.org/standards/documents/ASF/DSP0136.pdf
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* (the ASF specification includes RMCP)
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*/
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static int proto_rmcp = -1;
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static int hf_rmcp_version = -1;
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static int hf_rmcp_reserved = -1;
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static int hf_rmcp_sequence = -1;
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static int hf_rmcp_class = -1;
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static int hf_rmcp_type = -1;
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static int hf_rmcp_trailer = -1;
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static int proto_rsp = -1;
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static int hf_rsp_session_id = -1;
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static int hf_rsp_sequence = -1;
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static gint ett_rmcp = -1;
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static gint ett_rmcp_typeclass = -1;
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static gint ett_rsp = -1;
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static dissector_table_t rmcp_dissector_table;
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#define UDP_PORT_RMCP 623
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#define UDP_PORT_RMCP_SECURE 664
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#define RMCP_TYPE_MASK 0x80
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#define RMCP_TYPE_NORM 0x00
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#define RMCP_TYPE_ACK 0x01
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static const value_string rmcp_type_vals[] = {
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{ RMCP_TYPE_NORM, "Normal RMCP" },
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{ RMCP_TYPE_ACK, "RMCP ACK" },
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{ 0, NULL }
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};
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#define RMCP_CLASS_MASK 0x1f
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#define RMCP_CLASS_ASF 0x06
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#define RMCP_CLASS_IPMI 0x07
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#define RMCP_CLASS_OEM 0x08
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static const value_string rmcp_class_vals[] = {
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{ RMCP_CLASS_ASF, "ASF" },
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{ RMCP_CLASS_IPMI, "IPMI" },
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{ RMCP_CLASS_OEM, "OEM" },
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{ 0, NULL }
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};
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static int
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dissect_rmcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_tree *rmcp_tree = NULL, *field_tree;
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proto_item *ti;
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tvbuff_t *next_tvb;
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guint8 rmcp_class;
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const gchar *class_str;
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guint8 type;
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guint len;
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/*
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* Check whether it's a known class value; if not, assume it's
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* not RMCP.
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*/
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if (!tvb_bytes_exist(tvb, 3, 1))
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return 0; /* class value byte not present */
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rmcp_class = tvb_get_guint8(tvb, 3);
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/* Get the normal/ack bit from the RMCP class */
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type = (rmcp_class & RMCP_TYPE_MASK) >> 7;
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rmcp_class &= RMCP_CLASS_MASK;
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class_str = try_val_to_str(rmcp_class, rmcp_class_vals);
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if (class_str == NULL)
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return 0; /* unknown class value */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RMCP");
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s, Class: %s",
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val_to_str(type, rmcp_type_vals, "Unknown (0x%02x)"),
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class_str);
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_rmcp, tvb, 0, 4,
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"Remote Management Control Protocol, Class: %s",
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class_str);
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rmcp_tree = proto_item_add_subtree(ti, ett_rmcp);
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proto_tree_add_item(rmcp_tree, hf_rmcp_version, tvb, 0, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(rmcp_tree, hf_rmcp_reserved, tvb, 1, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(rmcp_tree, hf_rmcp_sequence, tvb, 2, 1, ENC_LITTLE_ENDIAN);
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field_tree = proto_tree_add_subtree_format(rmcp_tree, tvb, 3, 1,
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ett_rmcp_typeclass, NULL, "Type: %s, Class: %s",
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val_to_str(type, rmcp_type_vals, "Unknown (0x%02x)"),
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class_str);
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proto_tree_add_item(field_tree, hf_rmcp_class, tvb, 3, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(field_tree, hf_rmcp_type, tvb, 3, 1, ENC_LITTLE_ENDIAN);
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}
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if (!type){ /* do not expect a data block for an ACK */
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next_tvb = tvb_new_subset_remaining(tvb, 4);
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if (!dissector_try_uint(rmcp_dissector_table, rmcp_class, next_tvb, pinfo,
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tree)) {
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len = call_data_dissector(next_tvb, pinfo, tree);
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if (len < tvb_reported_length(next_tvb)) {
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proto_tree_add_item(tree, hf_rmcp_trailer, tvb, 4 + len, -1, ENC_NA);
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}
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}
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}
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return tvb_captured_length(tvb);
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}
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static int
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dissect_rsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_tree *rsp_tree = NULL/*, *field_tree*/;
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proto_item *ti/*, *tf*/;
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tvbuff_t *next_tvb;
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int offset = 0;
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_rsp, tvb, offset, 8,
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"RMCP Security-extension Protocol");
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rsp_tree = proto_item_add_subtree(ti, ett_rsp);
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proto_tree_add_item(rsp_tree, hf_rsp_session_id, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(rsp_tree, hf_rsp_sequence, tvb, offset, 4, ENC_BIG_ENDIAN);
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/*offset += 4;*/
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}
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/* XXX determination of RCMP message length needs to
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* be done according to 3.2.3.3.3 of the specification.
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* This is only valid for session ID equals 0
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*/
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next_tvb = tvb_new_subset_remaining(tvb, 8);
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dissect_rmcp(next_tvb, pinfo, tree, NULL);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_rmcp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_rmcp_version, {
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"Version", "rmcp.version",
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FT_UINT8, BASE_HEX, NULL, 0,
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"RMCP Version", HFILL }},
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{ &hf_rmcp_reserved, {
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"Reserved", "rmcp.version",
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FT_UINT8, BASE_HEX, NULL, 0,
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"RMCP Reserved", HFILL }},
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{ &hf_rmcp_sequence, {
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"Sequence", "rmcp.sequence",
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FT_UINT8, BASE_HEX, NULL, 0,
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"RMCP Sequence", HFILL }},
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{ &hf_rmcp_class, {
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"Class", "rmcp.class",
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FT_UINT8, BASE_HEX,
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VALS(rmcp_class_vals), RMCP_CLASS_MASK,
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"RMCP Class", HFILL }},
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{ &hf_rmcp_type, {
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"Message Type", "rmcp.type",
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FT_UINT8, BASE_HEX,
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VALS(rmcp_type_vals), RMCP_TYPE_MASK,
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"RMCP Message Type", HFILL }},
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{ &hf_rmcp_trailer, {
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"RSP Trailer", "rmcp.trailer",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_rmcp,
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&ett_rmcp_typeclass
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};
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proto_rmcp = proto_register_protocol(
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"Remote Management Control Protocol", "RMCP", "rmcp");
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proto_register_field_array(proto_rmcp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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rmcp_dissector_table = register_dissector_table(
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"rmcp.class", "RMCP Class", proto_rmcp, FT_UINT8, BASE_HEX, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
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}
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void
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proto_register_rsp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_rsp_session_id, {
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"Session ID", "rsp.session_id",
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FT_UINT32, BASE_HEX, NULL, 0,
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"RSP session ID", HFILL }},
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{ &hf_rsp_sequence, {
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"Sequence", "rsp.sequence",
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FT_UINT32, BASE_HEX, NULL, 0,
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"RSP sequence", HFILL }},
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};
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static gint *ett[] = {
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&ett_rsp
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};
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proto_rsp = proto_register_protocol(
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"RMCP Security-extensions Protocol", "RSP", "rsp");
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proto_register_field_array(proto_rsp, 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_rmcp(void)
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{
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dissector_handle_t rmcp_handle;
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rmcp_handle = create_dissector_handle(dissect_rmcp, proto_rmcp);
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dissector_add_uint("udp.port", UDP_PORT_RMCP, rmcp_handle);
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}
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void
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proto_reg_handoff_rsp(void)
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{
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dissector_handle_t rsp_handle;
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rsp_handle = create_dissector_handle(dissect_rsp, proto_rsp);
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dissector_add_uint("udp.port", UDP_PORT_RMCP_SECURE, rsp_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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