2015-01-12 13:31:16 +00:00
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/* packet-hcrt.c
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*
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* Routines for Hotline Command-Response Transaction (HCrt)
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* Protocol specifications (draft) are available here
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* https://github.com/ShepardSiegel/hotline/tree/master/doc
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*
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* Copyright 2013 Dario Lombardo (lomato@gmail.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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2018-02-12 11:23:27 +00:00
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* SPDX-License-Identifier: GPL-2.0-or-later
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2015-01-12 13:31:16 +00:00
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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static int proto_hcrt = -1;
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2015-01-29 09:22:17 +00:00
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#define HCRT_UDP_PORTS_DEFAULT "47000"
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2015-01-12 13:31:16 +00:00
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static gint ethertype_pref = 0xf052;
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static int hf_hcrt_header = -1;
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static int hf_hcrt_message_tag = -1;
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static int hf_hcrt_message_type = -1;
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static int hf_hcrt_am = -1;
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static int hf_hcrt_do = -1;
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static int hf_hcrt_1st_dword_enable = -1;
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static int hf_hcrt_last_dword_enable = -1;
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static int hf_hcrt_resp_code = -1;
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static int hf_hcrt_adl = -1;
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static int hf_hcrt_last = -1;
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static int hf_hcrt_body = -1;
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static int hf_hcrt_addr_32 = -1;
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static int hf_hcrt_addr_64 = -1;
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static int hf_hcrt_data_32 = -1;
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static int hf_hcrt_data_64 = -1;
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static int hf_hcrt_command_nop = -1;
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static gint ett_hcrt = -1;
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static gint ett_hcrt_msg = -1;
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static gint ett_hcrt_hdr = -1;
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static gint ett_hcrt_body = -1;
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static expert_field ei_hcrt_error = EI_INIT;
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void proto_reg_handoff_hcrt(void);
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2015-01-27 10:53:05 +00:00
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void proto_register_hcrt(void);
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2015-01-12 13:31:16 +00:00
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#define HCRT_HDR_LEN 4
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#define HCRT_NOP 0x0
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#define HCRT_WRITE 0x1
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#define HCRT_READ 0x2
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#define HCRT_RESPONSE 0x3
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#define ADDR_MODE_32 1
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#define ADDR_MODE_64 2
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/* Message types */
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static const value_string hcrt_message_types[] = {
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{0x00, "NOP"},
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{0x01, "Write"},
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{0x02, "Read"},
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{0x03, "Response"},
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{0, NULL}
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};
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/* Addressing modes */
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static const value_string hcrt_ams[] = {
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{0x0, "32 bit"},
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{0x1, "64 bit"},
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{0, NULL}
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};
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/* Discovery operations */
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static const true_false_string hcrt_dos = {
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"DO",
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"not DO",
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};
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static const value_string dword_enable_vals[] = {
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{0xF, "4B"},
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{0xC, "2B (MS)"},
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{0x3, "2B (LS)"},
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{0x8, "1B (B3)"},
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{0x4, "1B (B2)"},
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{0x2, "1B (B1)"},
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{0x1, "1B (B0)"},
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{0, NULL}
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};
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static const value_string response_codes[] = {
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{0x0, "OK"},
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{0x1, "Timeout"},
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{0x2, "Error"},
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{0x3, "Reserved"},
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{0x4, "Reserved"},
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{0x5, "Reserved"},
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{0x6, "Reserved"},
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{0x7, "Reserved"},
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{0x8, "Reserved"},
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{0x9, "Reserved"},
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{0xa, "Reserved"},
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{0xb, "Reserved"},
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{0xc, "Reserved"},
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{0xd, "Reserved"},
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{0xe, "Reserved"},
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{0xf, "Reserved"},
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{0, NULL}
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};
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static void dissect_hcrt_body(tvbuff_t* tvb, proto_tree* tree , int* offset,
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int type, int addr_mode, int adl, int body_len)
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{
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proto_item* ti_body;
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proto_tree* hcrt_body_tree;
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gint i;
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ti_body = proto_tree_add_item(tree, hf_hcrt_body, tvb, *offset, body_len, ENC_NA);
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hcrt_body_tree = proto_item_add_subtree(ti_body, ett_hcrt_body);
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switch (type) {
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case HCRT_NOP:
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proto_tree_add_item(hcrt_body_tree, hf_hcrt_command_nop, tvb, *offset,
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body_len, ENC_NA);
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break;
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case HCRT_WRITE:
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if (addr_mode == ADDR_MODE_32) {
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/* Address (32) */
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proto_tree_add_item(hcrt_body_tree, hf_hcrt_addr_32, tvb, *offset,
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4, ENC_LITTLE_ENDIAN);
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/* Data */
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for (i = 1; i <= adl; i++) {
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proto_tree_add_item(hcrt_body_tree, hf_hcrt_data_32, tvb,
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*offset + i * 4, 4, ENC_LITTLE_ENDIAN);
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}
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} else {
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/* Address (64) */
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proto_tree_add_item(hcrt_body_tree, hf_hcrt_addr_64, tvb, *offset,
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8, ENC_LITTLE_ENDIAN);
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/* Data */
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for (i = 1; i <= adl; i++)
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proto_tree_add_item(hcrt_body_tree, hf_hcrt_data_64, tvb,
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*offset + i * 8, 8, ENC_LITTLE_ENDIAN);
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}
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break;
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case HCRT_READ:
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if (addr_mode == ADDR_MODE_32) {
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/* Address (32) */
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proto_tree_add_item(hcrt_body_tree, hf_hcrt_addr_32, tvb, *offset, 4,
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ENC_LITTLE_ENDIAN);
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} else {
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/* Address (64) */
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proto_tree_add_item(hcrt_body_tree, hf_hcrt_addr_64, tvb, *offset, 8,
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ENC_LITTLE_ENDIAN);
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}
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break;
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case HCRT_RESPONSE:
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if (body_len > 0) {
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proto_tree_add_item(hcrt_body_tree, hf_hcrt_command_nop, tvb, *offset,
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body_len, ENC_NA);
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}
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break;
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default:
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DISSECTOR_ASSERT_NOT_REACHED();
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break;
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}
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(*offset) += body_len;
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}
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/* Returns true if this is the last message */
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static gboolean dissect_hcrt_header(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree,
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int* offset, guint8 b0_first, guint8 b0_current)
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{
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proto_item* ti_hdr;
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proto_tree* hcrt_hdr_tree;
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gboolean last;
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guint8 type;
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ti_hdr = proto_tree_add_item(tree, hf_hcrt_header, tvb, *offset, 4, ENC_NA);
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hcrt_hdr_tree = proto_item_add_subtree(ti_hdr, ett_hcrt_hdr);
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if (b0_first != b0_current) {
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expert_add_info_format(pinfo, hcrt_hdr_tree, &ei_hcrt_error,
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"Invalid Byte 0 in Header. Must be equal in all HCrt messages. "
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"Expected: %.2X, got: %.2X", b0_first, b0_current);
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}
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type = (b0_current & 0x30) >> 4;
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/* == Byte 0 == */
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/* TAG */
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proto_tree_add_item(hcrt_hdr_tree, hf_hcrt_message_tag, tvb,
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*offset, 1, ENC_NA);
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/* Message Type */
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proto_tree_add_item(hcrt_hdr_tree, hf_hcrt_message_type, tvb,
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*offset, 1, ENC_NA);
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/* Addressing Mode */
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proto_tree_add_item(hcrt_hdr_tree, hf_hcrt_am, tvb,
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*offset, 1, ENC_NA);
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/* Discovery Operation */
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proto_tree_add_item(hcrt_hdr_tree, hf_hcrt_do, tvb,
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*offset, 1, ENC_NA);
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(*offset)++;
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/* == Byte 1 == */
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if (type != HCRT_RESPONSE) {
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/* 1st DWORD enable */
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proto_tree_add_item(hcrt_hdr_tree, hf_hcrt_1st_dword_enable, tvb,
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*offset, 1, ENC_NA);
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} else {
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/* Response Code */
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proto_tree_add_item(hcrt_hdr_tree, hf_hcrt_resp_code, tvb,
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*offset, 1, ENC_NA);
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}
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if (type != HCRT_RESPONSE) {
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/* Last DWORD enable */
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proto_tree_add_item(hcrt_hdr_tree, hf_hcrt_last_dword_enable, tvb,
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*offset, 1, ENC_NA);
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}
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(*offset)++;
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/* == Byte 2 & 3 == */
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/* ADL */
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proto_tree_add_item(hcrt_hdr_tree, hf_hcrt_adl, tvb, *offset, 2, ENC_LITTLE_ENDIAN);
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/* Last */
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proto_tree_add_item(hcrt_hdr_tree, hf_hcrt_last, tvb, *offset, 2, ENC_LITTLE_ENDIAN);
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/* last */
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last = (tvb_get_letohs(tvb, *offset) & 0x8000) != 0;
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(*offset) += 2;
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return last;
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}
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/* Return true if this is the last message */
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static gboolean dissect_hcrt_message(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree,
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int* offset, guint8 b0_first, int i)
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{
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gboolean last;
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guint adl;
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guint addr_mode;
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guint body_len;
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proto_tree* hcrt_msg_tree;
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guint8 b0_current;
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int type;
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/* Save byte 0 of current packet */
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b0_current = tvb_get_guint8(tvb, *offset);
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/* Get details from header */
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adl = tvb_get_letohs(tvb, *offset + 2) & 0x0FFF;
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addr_mode = (1 + ((b0_current & 0x40) >> 6));
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type = (b0_current & 0x30) >> 4;
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switch (type) {
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case HCRT_NOP:
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body_len = 4 * addr_mode * adl;
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break;
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case HCRT_WRITE:
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body_len = 4 * addr_mode * (adl + 1);
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break;
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case HCRT_READ:
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body_len = 4 * addr_mode;
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break;
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case HCRT_RESPONSE:
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body_len = 4 * addr_mode * adl;
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break;
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default:
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DISSECTOR_ASSERT_NOT_REACHED();
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break;
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}
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hcrt_msg_tree = proto_tree_add_subtree_format(tree, tvb, *offset,
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HCRT_HDR_LEN + body_len, ett_hcrt_msg, NULL, "Message %d", i);
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last = dissect_hcrt_header(tvb, pinfo, hcrt_msg_tree, offset, b0_first, b0_current);
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dissect_hcrt_body(tvb, hcrt_msg_tree, offset, type, addr_mode, adl, body_len);
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return last;
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}
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2015-11-15 21:51:45 +00:00
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static int dissect_hcrt(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree, void* data _U_)
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2015-01-12 13:31:16 +00:00
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{
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guint8 type;
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proto_item* ti;
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proto_tree* hcrt_tree;
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guint offset;
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int i = 1;
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guint8 b0_first;
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guint8 tag;
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guint adl;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "HCrt");
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col_clear(pinfo->cinfo, COL_INFO);
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/* Save byte 0 of first message. Will be checked against byte 0 of other messages */
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b0_first = tvb_get_guint8(tvb, 0);
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tag = b0_first & 0x0F;
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type = (b0_first & 0x30) >> 4;
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adl = tvb_get_letohs(tvb, 2) & 0x0FFF;
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col_add_fstr(pinfo->cinfo, COL_INFO, "Type: %s, Tag: 0x%X, ADL: %u",
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val_to_str(type, hcrt_message_types, "Unknown (0x%02x)"), tag, adl);
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if (adl == 1) {
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if (type == HCRT_READ || type == HCRT_WRITE) {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Address: 0x%.8X", tvb_get_letohl(tvb, 4));
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}
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if (type == HCRT_WRITE) {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Data: 0x%.8X", tvb_get_letohl(tvb, 8));
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}
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}
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offset = 0;
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ti = proto_tree_add_item(tree, proto_hcrt, tvb, 0, -1, ENC_NA);
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hcrt_tree = proto_item_add_subtree(ti, ett_hcrt);
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while (!dissect_hcrt_message(tvb, pinfo, hcrt_tree, &offset, b0_first, i)) {
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i++;
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}
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2015-11-15 21:51:45 +00:00
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return tvb_captured_length(tvb);
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2015-01-12 13:31:16 +00:00
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}
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void proto_register_hcrt(void)
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{
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expert_module_t* expert_hcrt;
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module_t* hcrt_module;
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static hf_register_info hf[] = {
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{ &hf_hcrt_header,
|
|
|
|
{ "Header", "hcrt.hdr",
|
|
|
|
FT_NONE, BASE_NONE,
|
|
|
|
NULL, 0x00,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_message_tag,
|
|
|
|
{ "Tag", "hcrt.tag",
|
|
|
|
FT_UINT8, BASE_HEX,
|
|
|
|
NULL, 0x0F,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_message_type,
|
|
|
|
{ "Type", "hcrt.type",
|
|
|
|
FT_UINT8, BASE_DEC,
|
|
|
|
VALS(hcrt_message_types), 0x30,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_am,
|
|
|
|
{ "Addressing Mode", "hcrt.am",
|
|
|
|
FT_UINT8, BASE_DEC,
|
|
|
|
VALS(hcrt_ams), 0x40,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_do,
|
|
|
|
{ "Discovery Operation", "hcrt.do",
|
|
|
|
FT_BOOLEAN, 8,
|
|
|
|
TFS(&hcrt_dos), 0x80,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_1st_dword_enable,
|
|
|
|
{ "1st DWORD enable", "hcrt.first_dword_enable",
|
|
|
|
FT_UINT8, BASE_HEX,
|
|
|
|
VALS(dword_enable_vals), 0xF0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_last_dword_enable,
|
|
|
|
{ "Last DWORD enable", "hcrt.last_dword_enable",
|
|
|
|
FT_UINT8, BASE_HEX,
|
|
|
|
VALS(dword_enable_vals), 0x0F,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_resp_code,
|
|
|
|
{ "Response code", "hcrt.response_code",
|
|
|
|
FT_UINT8, BASE_HEX,
|
|
|
|
VALS(response_codes), 0xF0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_adl,
|
|
|
|
{ "ADL", "hcrt.adl",
|
|
|
|
FT_UINT16, BASE_DEC,
|
|
|
|
NULL, 0x0FFF,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_last,
|
|
|
|
{ "Last message", "hcrt.last",
|
|
|
|
FT_BOOLEAN, 16,
|
|
|
|
NULL, 0x8000,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_body,
|
|
|
|
{ "Body", "hcrt.body",
|
|
|
|
FT_NONE, BASE_NONE,
|
|
|
|
NULL, 0x00,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_addr_32,
|
|
|
|
{ "Address", "hcrt.address32",
|
|
|
|
FT_UINT32, BASE_HEX,
|
|
|
|
NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_addr_64,
|
|
|
|
{ "Address", "hcrt.address64",
|
|
|
|
FT_UINT64, BASE_HEX,
|
|
|
|
NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_data_32,
|
|
|
|
{ "Data", "hcrt.data32",
|
|
|
|
FT_UINT32, BASE_HEX,
|
|
|
|
NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_data_64,
|
2016-02-21 18:22:41 +00:00
|
|
|
{ "Data", "hcrt.data64",
|
2015-01-12 13:31:16 +00:00
|
|
|
FT_UINT64, BASE_HEX,
|
|
|
|
NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_hcrt_command_nop,
|
|
|
|
{ "Command", "hcrt.command_nop",
|
|
|
|
FT_BYTES, BASE_NONE,
|
|
|
|
NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
static ei_register_info ei[] = {
|
|
|
|
{ &ei_hcrt_error, { "hcrt.error", PI_MALFORMED, PI_ERROR, "Unusual error code", EXPFILL }}
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Setup protocol subtree array */
|
|
|
|
static gint* ett[] = {
|
|
|
|
&ett_hcrt,
|
|
|
|
&ett_hcrt_msg,
|
|
|
|
&ett_hcrt_hdr,
|
|
|
|
&ett_hcrt_body,
|
|
|
|
};
|
|
|
|
|
2016-10-05 20:33:54 +00:00
|
|
|
proto_hcrt = proto_register_protocol ("Hotline Command-Response Transaction protocol", "HCrt", "hcrt");
|
2015-01-12 13:31:16 +00:00
|
|
|
|
|
|
|
proto_register_field_array(proto_hcrt, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
expert_hcrt = expert_register_protocol(proto_hcrt);
|
|
|
|
expert_register_field_array(expert_hcrt, ei, array_length(ei));
|
|
|
|
|
|
|
|
hcrt_module = prefs_register_protocol(proto_hcrt, proto_reg_handoff_hcrt);
|
|
|
|
prefs_register_uint_preference(hcrt_module,
|
|
|
|
"dissector_ethertype",
|
|
|
|
"Ethernet type",
|
|
|
|
"The ethernet type used for L2 communications",
|
|
|
|
10, ðertype_pref);
|
|
|
|
}
|
|
|
|
|
|
|
|
void proto_reg_handoff_hcrt(void)
|
|
|
|
{
|
|
|
|
static dissector_handle_t hcrt_handle;
|
|
|
|
static gboolean hcrt_prefs_initialized = FALSE;
|
|
|
|
static gint hcrt_ethertype;
|
|
|
|
|
|
|
|
if (!hcrt_prefs_initialized) {
|
2015-12-09 03:49:44 +00:00
|
|
|
hcrt_handle = create_dissector_handle(dissect_hcrt, proto_hcrt);
|
2015-01-12 13:31:16 +00:00
|
|
|
/* Also register as a dissector that can be selected by a TCP port number via
|
|
|
|
"decode as" */
|
2016-10-07 20:25:01 +00:00
|
|
|
dissector_add_for_decode_as_with_preference("tcp.port", hcrt_handle);
|
2016-10-05 20:33:54 +00:00
|
|
|
dissector_add_uint_range_with_preference("udp.port", HCRT_UDP_PORTS_DEFAULT, hcrt_handle);
|
2015-01-12 13:31:16 +00:00
|
|
|
hcrt_prefs_initialized = TRUE;
|
|
|
|
} else {
|
|
|
|
dissector_delete_uint("ethertype", hcrt_ethertype, hcrt_handle);
|
|
|
|
}
|
|
|
|
|
|
|
|
hcrt_ethertype = ethertype_pref;
|
|
|
|
|
|
|
|
dissector_add_uint("ethertype", hcrt_ethertype, hcrt_handle);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
|
|
*
|
|
|
|
* Local variables:
|
|
|
|
* c-basic-offset: 4
|
|
|
|
* tab-width: 8
|
|
|
|
* indent-tabs-mode: nil
|
|
|
|
* End:
|
|
|
|
*
|
|
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
|
|
*/
|