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  * 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 <epan/addr_resolv.h>
  16
  17 void proto_register_wfleet_hdlc(void);
  18 void proto_reg_handoff_wfleet_hdlc(void);
  19
  20 static int proto_wfleet_hdlc;
  21 static int hf_wfleet_hdlc_addr;
  22 static int hf_wfleet_hdlc_cmd;
  23
  24 static int ett_wfleet_hdlc;
  25
  26 static dissector_handle_t eth_withoutfcs_handle;
  27 static dissector_handle_t wfleet_hdlc_handle;
  28
  29 static const value_string wfleet_hdlc_cmd_vals[] = {
  30   { 0x03, "Un-numbered I frame"},
  31   { 0,    NULL}
  32 };
  33
  34 static int
  35 dissect_wfleet_hdlc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  36 {
  37   proto_item *ti;
  38   proto_tree *fh_tree = NULL;
  39   tvbuff_t   *next_tvb;
  40   uint8_t    addr;
  41   uint8_t    cmd;
  42
  43   col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A");
  44   col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A");
  45   col_set_str(pinfo->cinfo, COL_PROTOCOL, "WHDLC");
  46   col_clear(pinfo->cinfo, COL_INFO);
  47
  48   addr = tvb_get_uint8(tvb, 0);
  49   cmd = tvb_get_uint8(tvb, 1);
  50
  51   if (tree) {
  52     ti = proto_tree_add_item(tree, proto_wfleet_hdlc, tvb, 0, 2, ENC_NA);
  53     fh_tree = proto_item_add_subtree(ti, ett_wfleet_hdlc);
  54
  55     proto_tree_add_uint(fh_tree, hf_wfleet_hdlc_addr, tvb, 0, 1, addr);
  56     proto_tree_add_uint(fh_tree, hf_wfleet_hdlc_cmd, tvb, 1, 1, cmd);
  57
  58   }
  59
  60   /*
  61    * Build a tvb of the piece past the first two bytes and call the
  62    * ethernet dissector
  63    */
  64
  65   next_tvb = tvb_new_subset_remaining(tvb, 2);
  66
  67   call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);
  68   return tvb_captured_length(tvb);
  69 }
  70
  71 void
  72 proto_register_wfleet_hdlc(void)
  73 {
  74   static hf_register_info hf[] = {
  75     { &hf_wfleet_hdlc_addr,
  76       { "Address", "wfleet_hdlc.address", FT_UINT8, BASE_HEX,
  77         NULL, 0x0, NULL, HFILL }},
  78     { &hf_wfleet_hdlc_cmd,
  79       { "Command", "wfleet_hdlc.command", FT_UINT8, BASE_HEX,
  80         VALS(wfleet_hdlc_cmd_vals), 0x0, NULL, HFILL }},
  81   };
  82   static int *ett[] = {
  83     &ett_wfleet_hdlc,
  84   };
  85
  86   proto_wfleet_hdlc = proto_register_protocol("Wellfleet HDLC", "WHDLC", "whdlc");
  87   proto_register_field_array(proto_wfleet_hdlc, hf, array_length(hf));
  88   proto_register_subtree_array(ett, array_length(ett));
  89
  90   wfleet_hdlc_handle = register_dissector("wfleet_hdlc", dissect_wfleet_hdlc, proto_wfleet_hdlc);
  91
  92 }
  93
  94 void
  95 proto_reg_handoff_wfleet_hdlc(void)
  96 {
  97   dissector_add_uint("wtap_encap", WTAP_ENCAP_WFLEET_HDLC, wfleet_hdlc_handle);
  98
  99   /*
 100    * Find the eth dissector and save a ref to it
 101    */
 102
 103   eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_wfleet_hdlc);
 104 }
 105
 106 /*
 107  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 108  *
 109  * Local Variables:
 110  * c-basic-offset: 2
 111  * tab-width: 8
 112  * indent-tabs-mode: nil
 113  * End:
 114  *
 115  * ex: set shiftwidth=2 tabstop=8 expandtab:
 116  * :indentSize=2:tabSize=8:noTabs=true:
 117  */