epan/dissectors/packet-cimetrics.c

   1 /* packet-cimetrics.c
   2  * Routines for Cimetrics LLC OUI dissection
   3  * Copyright 2008 Steve Karg <skarg@users.sourceforge.net> Alabama
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * SPDX-License-Identifier: GPL-2.0-or-later
  10  */
  11
  12 #include "config.h"
  13
  14 #include <epan/packet.h>
  15 #include "packet-llc.h"
  16 #include <epan/oui.h>
  17 #include "packet-mstp.h"
  18
  19 void proto_register_cimetrics(void);
  20 void proto_reg_handoff_cimetrics(void);
  21
  22 /* Probably should be a preference, but here for now */
  23 #define BACNET_MSTP_SUMMARY_IN_TREE
  24
  25 /* the U+4 device does MS/TP, uLAN, Modbus */
  26 static const value_string cimetrics_pid_vals[] = {
  27         { 0x0001,       "U+4 MS/TP" },
  28         { 0,            NULL }
  29 };
  30
  31 static int proto_cimetrics_mstp;
  32 static int hf_llc_cimetrics_pid;
  33 static int ett_cimetrics_mstp;
  34
  35 static int hf_cimetrics_mstp_timer;
  36 static int hf_cimetrics_mstp_value;
  37
  38 static dissector_handle_t cimetric_handle;
  39
  40 static int
  41 dissect_cimetrics_mstp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  42 {
  43         proto_item *ti;
  44         proto_tree *subtree;
  45         int offset = 0;
  46 #ifdef BACNET_MSTP_SUMMARY_IN_TREE
  47         uint8_t mstp_frame_type = 0;
  48         uint8_t mstp_frame_source = 0;
  49         uint8_t mstp_frame_destination = 0;
  50 #endif
  51
  52 #ifdef BACNET_MSTP_SUMMARY_IN_TREE
  53         mstp_frame_type = tvb_get_uint8(tvb, offset+3);
  54         mstp_frame_destination = tvb_get_uint8(tvb, offset+4);
  55         mstp_frame_source = tvb_get_uint8(tvb, offset+5);
  56         ti = proto_tree_add_protocol_format(tree,
  57                 proto_cimetrics_mstp, tvb, offset, 9,
  58                 "BACnet MS/TP, Src (%u), Dst (%u), %s",
  59                 mstp_frame_source, mstp_frame_destination,
  60                 mstp_frame_type_text(mstp_frame_type));
  61 #else
  62         ti = proto_tree_add_item(tree, proto_cimetrics_mstp, tvb, offset, 9, ENC_NA);
  63 #endif
  64         subtree = proto_item_add_subtree(ti, ett_cimetrics_mstp);
  65         proto_tree_add_item(subtree, hf_cimetrics_mstp_timer, tvb,
  66                         offset++, 2, ENC_LITTLE_ENDIAN);
  67         offset++;
  68         proto_tree_add_item(subtree, hf_cimetrics_mstp_value, tvb,
  69                         offset++, 1, ENC_LITTLE_ENDIAN);
  70         dissect_mstp(tvb, pinfo, tree, subtree, offset);
  71         return tvb_captured_length(tvb);
  72 }
  73
  74 void
  75 proto_register_cimetrics(void)
  76 {
  77         static hf_register_info hf[] = {
  78                 { &hf_cimetrics_mstp_timer,
  79                   { "Delta Time", "cimetrics.mstp_timer",
  80                     FT_UINT16, BASE_DEC, NULL, 0,
  81                     "Milliseconds", HFILL }
  82                 },
  83                 { &hf_cimetrics_mstp_value,
  84                   { "8-bit value", "cimetrics.mstp_value",
  85                     FT_UINT8, BASE_DEC, NULL, 0,
  86                     NULL, HFILL }
  87                 }
  88         };
  89         static hf_register_info hf2[] = {
  90                 { &hf_llc_cimetrics_pid,
  91                   { "PID", "llc.cimetrics_pid",
  92                     FT_UINT16, BASE_HEX, VALS(cimetrics_pid_vals), 0,
  93                     NULL, HFILL }
  94                 }
  95         };
  96         static int *ett[] = {
  97                 &ett_cimetrics_mstp
  98         };
  99
 100         proto_cimetrics_mstp = proto_register_protocol("Cimetrics MS/TP",
 101                                                        "Cimetrics MS/TP", "cimetrics");
 102
 103         proto_register_field_array(proto_cimetrics_mstp, hf, array_length(hf));
 104         proto_register_subtree_array(ett, array_length(ett));
 105
 106         cimetric_handle = register_dissector("cimetrics", dissect_cimetrics_mstp, proto_cimetrics_mstp);
 107
 108         llc_add_oui(OUI_CIMETRICS, "llc.cimetrics_pid",
 109                     "LLC Cimetrics OUI PID", hf2, proto_cimetrics_mstp);
 110 }
 111
 112 void
 113 proto_reg_handoff_cimetrics(void)
 114 {
 115         dissector_add_uint("llc.cimetrics_pid", 1, cimetric_handle);
 116 }
 117
 118 /*
 119  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 120  *
 121  * Local variables:
 122  * c-basic-offset: 8
 123  * tab-width: 8
 124  * indent-tabs-mode: t
 125  * End:
 126  *
 127  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 128  * :indentSize=8:tabSize=8:noTabs=false:
 129  */