epan/dissectors/packet-pa-hbbackup.c

   1 /* packet-hbbak.c
   2  * Routines for ethertype 0x8988 Paloalto heartbeat backup traffic via mgmt
   3  *
   4  * Copyright 2020 Joerg Mayer (see AUTHORS file)
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * SPDX-License-Identifier: GPL-2.0-or-later
  11  */
  12
  13 /* 2do:
  14  * - Find out the meaning of the 6 bytes header: timestamp?
  15  * - Handle trailer bytes correctly
  16  */
  17
  18 #include "config.h"
  19
  20 #include <epan/packet.h>
  21 #include <epan/etypes.h>
  22
  23 void proto_reg_handoff_hbbak(void);
  24 void proto_register_hbbak(void);
  25
  26 #define PROTO_SHORT_NAME "PA-HB-Bak"
  27 #define PROTO_LONG_NAME "Palo Alto Heartbeat Backup"
  28
  29 #define HBBAK_SIZE 8
  30
  31 static int proto_hbbak;
  32 static int hf_hbbak_unknown1;
  33 static int hf_hbbak_etype_outer;
  34 static int hf_hbbak_trailer;
  35
  36 static int ett_hbbak;
  37
  38 static dissector_handle_t hbbak_handle;
  39 static dissector_handle_t ethertype_handle;
  40
  41 static int
  42 dissect_hbbak(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  43 {
  44         proto_tree *ti, *hbbak_tree;
  45         int offset = 0;
  46         uint16_t eth_type_outer;
  47         ethertype_data_t ethertype_data;
  48
  49         col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
  50         col_clear(pinfo->cinfo, COL_INFO);
  51         col_add_fstr(pinfo->cinfo, COL_INFO, PROTO_LONG_NAME);
  52
  53         hbbak_tree = NULL;
  54         ti = proto_tree_add_item(tree, proto_hbbak, tvb, offset, HBBAK_SIZE, ENC_NA);
  55         hbbak_tree = proto_item_add_subtree(ti, ett_hbbak);
  56
  57         proto_tree_add_item(hbbak_tree, hf_hbbak_unknown1, tvb, offset, 6, ENC_NA);
  58         offset += 6;
  59         eth_type_outer = tvb_get_ntohs(tvb, offset);
  60         proto_tree_add_uint(hbbak_tree, hf_hbbak_etype_outer, tvb,
  61                             offset, 2, eth_type_outer);
  62
  63         ethertype_data.etype = eth_type_outer;
  64         ethertype_data.payload_offset = HBBAK_SIZE;
  65         ethertype_data.fh_tree = hbbak_tree;
  66         ethertype_data.trailer_id = hf_hbbak_trailer;
  67         ethertype_data.fcs_len = 0;
  68
  69         call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, &ethertype_data);
  70
  71         return tvb_captured_length(tvb);
  72 }
  73
  74 void
  75 proto_register_hbbak(void)
  76 {
  77         static hf_register_info hf[] = {
  78                 { &hf_hbbak_unknown1,
  79                 { "Unknown1", "hbbak.unknown1", FT_BYTES, BASE_NONE, NULL,
  80                         0x0, NULL, HFILL }},
  81
  82                 { &hf_hbbak_etype_outer,
  83                 { "Type", "hbbak.etype", FT_UINT16, BASE_HEX, VALS(etype_vals),
  84                         0x0, NULL, HFILL }},
  85
  86                 { &hf_hbbak_trailer,
  87                 { "Trailer", "hbbak.trailer", FT_BYTES, BASE_NONE, NULL,
  88                         0x0, NULL, HFILL }},
  89
  90         };
  91
  92         static int *ett[] = {
  93                 &ett_hbbak,
  94         };
  95
  96         proto_hbbak = proto_register_protocol(PROTO_LONG_NAME, PROTO_LONG_NAME, "hbbak");
  97         proto_register_field_array(proto_hbbak, hf, array_length(hf));
  98         proto_register_subtree_array(ett, array_length(ett));
  99         hbbak_handle = register_dissector("hbbak", dissect_hbbak, proto_hbbak);
 100 }
 101
 102 void
 103 proto_reg_handoff_hbbak(void)
 104 {
 105
 106         ethertype_handle = find_dissector_add_dependency("ethertype", proto_hbbak);
 107
 108         dissector_add_uint("ethertype", ETHERTYPE_PA_HBBACKUP, hbbak_handle);
 109 }
 110
 111 /*
 112  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 113  *
 114  * Local variables:
 115  * c-basic-offset: 8
 116  * tab-width: 8
 117  * indent-tabs-mode: t
 118  * End:
 119  *
 120  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 121  * :indentSize=8:tabSize=8:noTabs=false:
 122  */