/* packet-pulse.c
 * Routines for pulse dissection
 * Copyright 2013, Masatake YAMATO <yamato@redhat.com>
 * Copyright 2013, Red Hat, Inc.
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */


/* About pulse, see
    http://sourceware.org/piranha/ */

# include "config.h"

#include <epan/packet.h>

#define PORT_PULSE 539 /* Not IANA registered */

void proto_register_pulse(void);
void proto_reg_handoff_pulse(void);

static dissector_handle_t pulse_handle;

static int  proto_pulse;
static int  hf_pulse_magic;
static int ett_pulse;

/* piranha/pulse.c */
#define PULSE_HEARTBEAT_RUNNING_MAGIC     0xbdaddbda
#define PULSE_HEARTBEAT_STOPPED_MAGIC     0xadbddabd

static const value_string pulse_magic_type[] = {
    { PULSE_HEARTBEAT_RUNNING_MAGIC,   "running" },
    { PULSE_HEARTBEAT_STOPPED_MAGIC,   "stopped" },
    { 0, NULL                                    }
};

static int
dissect_pulse(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_)
{
    proto_item *item;
    proto_tree *tree;

    uint32_t magic;
    const char* magic_str;
    unsigned endian;

    if (tvb_captured_length(tvb) < 4)
        return 0;

    /* Try to read MAGIC in both endians */
    endian = ENC_LITTLE_ENDIAN;
    magic = tvb_get_letohl(tvb, 0);
    magic_str = try_val_to_str(magic, pulse_magic_type);
    if (magic_str == NULL) {
      magic = tvb_get_ntohl(tvb, 0);
      magic_str = try_val_to_str(magic, pulse_magic_type);
      if (magic_str == NULL) {
        return 0;
      }
      endian = ENC_BIG_ENDIAN;
    }

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "PULSE");
    col_set_str(pinfo->cinfo, COL_INFO, magic_str);

    if (parent_tree) {
        item = proto_tree_add_item(parent_tree, proto_pulse, tvb, 0,
                                   -1, endian);
        tree = proto_item_add_subtree(item, ett_pulse);
        proto_tree_add_item(tree, hf_pulse_magic, tvb, 0, 4, endian);
    }
    return 4;
}

void
proto_register_pulse(void)
{
    static hf_register_info hf[] = {
        { &hf_pulse_magic,
          { "Magic", "pulse.magic",
            FT_UINT32, BASE_HEX, VALS(pulse_magic_type), 0x0,
            NULL, HFILL }},
    };

    static int *ett[] = {
        &ett_pulse,
    };


    proto_pulse = proto_register_protocol("PULSE protocol for Linux Virtual Server redundancy", "PULSE", "pulse");
    proto_register_field_array(proto_pulse, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));

    pulse_handle = register_dissector("pulse", dissect_pulse, proto_pulse);
}

void
proto_reg_handoff_pulse(void)
{
    dissector_add_uint_with_preference("udp.port", PORT_PULSE, pulse_handle);
}

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */
