epan/dissectors/packet-pulse.c

   1 /* packet-pulse.c
   2  * Routines for pulse dissection
   3  * Copyright 2013, Masatake YAMATO <yamato@redhat.com>
   4  * Copyright 2013, Red Hat, Inc.
   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
  14 /* About pulse, see
  15     http://sourceware.org/piranha/ */
  16
  17 # include "config.h"
  18
  19 #include <epan/packet.h>
  20
  21 #define PORT_PULSE 539 /* Not IANA registered */
  22
  23 void proto_register_pulse(void);
  24 void proto_reg_handoff_pulse(void);
  25
  26 static dissector_handle_t pulse_handle;
  27
  28 static int  proto_pulse;
  29 static int  hf_pulse_magic;
  30 static int ett_pulse;
  31
  32 /* piranha/pulse.c */
  33 #define PULSE_HEARTBEAT_RUNNING_MAGIC     0xbdaddbda
  34 #define PULSE_HEARTBEAT_STOPPED_MAGIC     0xadbddabd
  35
  36 static const value_string pulse_magic_type[] = {
  37     { PULSE_HEARTBEAT_RUNNING_MAGIC,   "running" },
  38     { PULSE_HEARTBEAT_STOPPED_MAGIC,   "stopped" },
  39     { 0, NULL                                    }
  40 };
  41
  42 static int
  43 dissect_pulse(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_)
  44 {
  45     proto_item *item;
  46     proto_tree *tree;
  47
  48     uint32_t magic;
  49     const char* magic_str;
  50     unsigned endian;
  51
  52     if (tvb_captured_length(tvb) < 4)
  53         return 0;
  54
  55     /* Try to read MAGIC in both endians */
  56     endian = ENC_LITTLE_ENDIAN;
  57     magic = tvb_get_letohl(tvb, 0);
  58     magic_str = try_val_to_str(magic, pulse_magic_type);
  59     if (magic_str == NULL) {
  60       magic = tvb_get_ntohl(tvb, 0);
  61       magic_str = try_val_to_str(magic, pulse_magic_type);
  62       if (magic_str == NULL) {
  63         return 0;
  64       }
  65       endian = ENC_BIG_ENDIAN;
  66     }
  67
  68     col_set_str(pinfo->cinfo, COL_PROTOCOL, "PULSE");
  69     col_set_str(pinfo->cinfo, COL_INFO, magic_str);
  70
  71     if (parent_tree) {
  72         item = proto_tree_add_item(parent_tree, proto_pulse, tvb, 0,
  73                                    -1, endian);
  74         tree = proto_item_add_subtree(item, ett_pulse);
  75         proto_tree_add_item(tree, hf_pulse_magic, tvb, 0, 4, endian);
  76     }
  77     return 4;
  78 }
  79
  80 void
  81 proto_register_pulse(void)
  82 {
  83     static hf_register_info hf[] = {
  84         { &hf_pulse_magic,
  85           { "Magic", "pulse.magic",
  86             FT_UINT32, BASE_HEX, VALS(pulse_magic_type), 0x0,
  87             NULL, HFILL }},
  88     };
  89
  90     static int *ett[] = {
  91         &ett_pulse,
  92     };
  93
  94
  95     proto_pulse = proto_register_protocol("PULSE protocol for Linux Virtual Server redundancy", "PULSE", "pulse");
  96     proto_register_field_array(proto_pulse, hf, array_length(hf));
  97     proto_register_subtree_array(ett, array_length(ett));
  98
  99     pulse_handle = register_dissector("pulse", dissect_pulse, proto_pulse);
 100 }
 101
 102 void
 103 proto_reg_handoff_pulse(void)
 104 {
 105     dissector_add_uint_with_preference("udp.port", PORT_PULSE, pulse_handle);
 106 }
 107
 108 /*
 109  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 110  *
 111  * Local variables:
 112  * c-basic-offset: 4
 113  * tab-width: 8
 114  * indent-tabs-mode: nil
 115  * End:
 116  *
 117  * vi: set shiftwidth=4 tabstop=8 expandtab:
 118  * :indentSize=4:tabSize=8:noTabs=true:
 119  */