epan/dissectors/packet-wfleet-hdlc.c

   1 /* packet-chdlc.c
   2  * Routines for Wellfleet HDLC packet disassembly
   3  * Copied from the Cisco HDLC packet disassembly routines
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <glib.h>
  29 #include <epan/packet.h>
  30 #include <epan/etypes.h>
  31 #include <epan/addr_resolv.h>
  32 #include "packet-chdlc.h"
  33 #include "packet-ip.h"
  34
  35 static int proto_wfleet_hdlc = -1;
  36 static int hf_wfleet_hdlc_addr = -1;
  37 static int hf_wfleet_hdlc_cmd = -1;
  38
  39 static gint ett_wfleet_hdlc = -1;
  40
  41 static dissector_handle_t eth_withoutfcs_handle;
  42
  43 static const value_string wfleet_hdlc_cmd_vals[] = {
  44   { 0x03, "Un-numbered I frame"},
  45   { 0,    NULL}
  46 };
  47
  48 static void
  49 dissect_wfleet_hdlc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  50 {
  51   proto_item *ti;
  52   proto_tree *fh_tree = NULL;
  53   tvbuff_t   *next_tvb;
  54   guint8     addr;
  55   guint8     cmd;
  56
  57   col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A");
  58   col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A");
  59   col_set_str(pinfo->cinfo, COL_PROTOCOL, "WHDLC");
  60   col_clear(pinfo->cinfo, COL_INFO);
  61
  62   addr = tvb_get_guint8(tvb, 0);
  63   cmd = tvb_get_guint8(tvb, 1);
  64
  65   if (tree) {
  66     ti = proto_tree_add_item(tree, proto_wfleet_hdlc, tvb, 0, 2, ENC_NA);
  67     fh_tree = proto_item_add_subtree(ti, ett_wfleet_hdlc);
  68
  69     proto_tree_add_uint(fh_tree, hf_wfleet_hdlc_addr, tvb, 0, 1, addr);
  70     proto_tree_add_uint(fh_tree, hf_wfleet_hdlc_cmd, tvb, 1, 1, cmd);
  71
  72   }
  73
  74   /*
  75    * Build a tvb of the piece past the first two bytes and call the
  76    * ethernet dissector
  77    */
  78
  79   next_tvb = tvb_new_subset_remaining(tvb, 2);
  80
  81   call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);
  82
  83 }
  84
  85 void
  86 proto_register_wfleet_hdlc(void)
  87 {
  88   static hf_register_info hf[] = {
  89     { &hf_wfleet_hdlc_addr,
  90       { "Address", "wfleet_hdlc.address", FT_UINT8, BASE_HEX,
  91         NULL, 0x0, NULL, HFILL }},
  92     { &hf_wfleet_hdlc_cmd,
  93       { "Command", "wfleet_hdlc.command", FT_UINT8, BASE_HEX,
  94         VALS(wfleet_hdlc_cmd_vals), 0x0, NULL, HFILL }},
  95   };
  96   static gint *ett[] = {
  97     &ett_wfleet_hdlc,
  98   };
  99
 100   proto_wfleet_hdlc = proto_register_protocol("Wellfleet HDLC", "WHDLC", "whdlc");
 101   proto_register_field_array(proto_wfleet_hdlc, hf, array_length(hf));
 102   proto_register_subtree_array(ett, array_length(ett));
 103
 104   register_dissector("wfleet_hdlc", dissect_wfleet_hdlc, proto_wfleet_hdlc);
 105
 106 }
 107
 108 void
 109 proto_reg_handoff_wfleet_hdlc(void)
 110 {
 111   dissector_handle_t wfleet_hdlc_handle;
 112
 113   wfleet_hdlc_handle = find_dissector("wfleet_hdlc");
 114   dissector_add_uint("wtap_encap", WTAP_ENCAP_WFLEET_HDLC, wfleet_hdlc_handle);
 115
 116   /*
 117    * Find the eth dissector and save a ref to it
 118    */
 119
 120   eth_withoutfcs_handle = find_dissector("eth_withoutfcs");
 121 }