epan/dissectors/packet-lapbether.c

   1 /* packet-lapbether.c
   2  * Routines for lapbether frame disassembly
   3  * Richard Sharpe <rsharpe@ns.aus.com> based on the lapb module by
   4  * Olivier Abad <oabad@noos.fr>
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998
   9  *
  10  * SPDX-License-Identifier: GPL-2.0-or-later
  11  */
  12
  13 #include "config.h"
  14
  15 #include <epan/packet.h>
  16 #include <epan/etypes.h>
  17
  18 void proto_register_lapbether(void);
  19 void proto_reg_handoff_lapbether(void);
  20
  21 static int proto_lapbether;
  22
  23 static int hf_lapbether_length;
  24
  25 static int ett_lapbether;
  26
  27 static dissector_handle_t lapbether_handle;
  28 static dissector_handle_t lapb_handle;
  29
  30 static int
  31 dissect_lapbether(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  32 {
  33     proto_tree *lapbether_tree, *ti;
  34     int         len;
  35     tvbuff_t   *next_tvb;
  36
  37     col_set_str(pinfo->cinfo, COL_PROTOCOL, "LAPBETHER");
  38     col_clear(pinfo->cinfo, COL_INFO);
  39
  40     len = tvb_get_uint8(tvb, 0) + tvb_get_uint8(tvb, 1) * 256;
  41
  42     if (tree) {
  43
  44       ti = proto_tree_add_protocol_format(tree, proto_lapbether, tvb, 0, 2,
  45                                           "LAPBETHER");
  46
  47       lapbether_tree = proto_item_add_subtree(ti, ett_lapbether);
  48       proto_tree_add_uint_format(lapbether_tree, hf_lapbether_length, tvb, 0, 2,
  49                                  len, "Length: %u", len);
  50
  51     }
  52
  53     next_tvb = tvb_new_subset_length(tvb, 2, len);
  54     call_dissector(lapb_handle, next_tvb, pinfo, tree);
  55
  56     return tvb_captured_length(tvb);
  57 }
  58
  59 void
  60 proto_register_lapbether(void)
  61 {
  62     static hf_register_info hf[] = {
  63       { &hf_lapbether_length,
  64         { "Length Field", "lapbether.length", FT_UINT16, BASE_DEC, NULL, 0x0,
  65           "LAPBEther Length Field", HFILL }},
  66
  67     };
  68     static int *ett[] = {
  69         &ett_lapbether,
  70     };
  71
  72     proto_lapbether = proto_register_protocol ("Link Access Procedure Balanced Ethernet (LAPBETHER)",
  73         "LAPBETHER", "lapbether");
  74     proto_register_field_array (proto_lapbether, hf, array_length(hf));
  75     proto_register_subtree_array(ett, array_length(ett));
  76
  77   lapbether_handle = register_dissector("lapbether", dissect_lapbether, proto_lapbether);
  78 }
  79
  80 /* The registration hand-off routine */
  81 void
  82 proto_reg_handoff_lapbether(void)
  83 {
  84   /*
  85    * Get a handle for the LAPB dissector.
  86    */
  87   lapb_handle = find_dissector_add_dependency("lapb", proto_lapbether);
  88
  89   dissector_add_uint("ethertype", ETHERTYPE_DEC, lapbether_handle);
  90
  91 }
  92
  93 /*
  94  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
  95  *
  96  * Local Variables:
  97  * c-basic-offset: 2
  98  * tab-width: 8
  99  * indent-tabs-mode: nil
 100  * End:
 101  *
 102  * ex: set shiftwidth=2 tabstop=8 expandtab:
 103  * :indentSize=2:tabSize=8:noTabs=true:
 104  */