/* packet-swipe.c

 * swIPe IP Security Protocol

 *

 * http://www.crypto.com/papers/swipe.id.txt

 *

 * Copyright 2014 by Michael Mann

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

#include "config.h"

#include <epan/packet.h>

#include "packet-iana-data.h"

void proto_register_swipe(void);

void proto_reg_handoff_swipe(void);

/* Routing Header Types */

static const value_string swipe_packet_type_vals[] = {

    { 0, "Plain encapsulation" },

    { 1, "Packet is authenticated but not encrypted" },

    { 2, "Packet is encrypted" },

    { 3, "Packet is both authenticated and encrypted" },

    { 0, NULL }

};

/* Initialize the protocol and registered fields */

static int proto_swipe;

static int hf_swipe_packet_type;

static int hf_swipe_len;

static int hf_swipe_policy_id;

static int hf_swipe_packet_seq;

static int hf_swipe_authenticator;

/* Initialize the subtree pointers */

static int ett_swipe;

static dissector_handle_t swipe_handle;

static dissector_handle_t ipv6_handle;

static int

dissect_swipe(tvbuff_t *tvb, packet_info * pinfo, proto_tree *tree, void* data _U_)

{

    int             header_len, offset = 0;

    proto_tree      *swipe_tree;

    proto_item      *ti;

    tvbuff_t        *next_tvb;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "swIPe");

    col_clear(pinfo->cinfo, COL_INFO);

    header_len = tvb_get_uint8(tvb, offset + 1);

    if (tree)

    {

        ti = proto_tree_add_item(tree, proto_swipe, tvb, offset, header_len, ENC_NA);

        swipe_tree = proto_item_add_subtree(ti, ett_swipe);

        /* Packet Type */

        proto_tree_add_item(swipe_tree, hf_swipe_packet_type, tvb, offset, 1, ENC_BIG_ENDIAN);

        /* Header Length */

        proto_tree_add_item(swipe_tree, hf_swipe_len, tvb, offset + 1, 1, ENC_BIG_ENDIAN);

        /* Policy ID */

        proto_tree_add_item(swipe_tree, hf_swipe_policy_id, tvb, offset + 2, 2, ENC_BIG_ENDIAN);

        /* Packet Sequence Number */

        proto_tree_add_item(swipe_tree, hf_swipe_packet_seq, tvb, offset + 4, 4, ENC_BIG_ENDIAN);

        if (header_len > 8)

            proto_tree_add_item(swipe_tree, hf_swipe_authenticator, tvb, offset + 8, header_len - 8, ENC_NA);

    }

    next_tvb = tvb_new_subset_remaining(tvb, header_len);

    call_dissector(ipv6_handle, next_tvb, pinfo, tree);

    return tvb_captured_length(tvb);

}

/* Register the protocol with Wireshark */

void

proto_register_swipe(void)

{

    /* Setup list of header fields */

    static hf_register_info hf[] = {

        { &hf_swipe_packet_type,      { "Packet type",      "swipe.packet_type",      FT_UINT8, BASE_DEC, VALS(swipe_packet_type_vals), 0x0, NULL, HFILL } },

        { &hf_swipe_len,     { "Header Length",     "swipe.len",     FT_UINT8,  BASE_DEC, NULL,                      0x0, NULL, HFILL } },

        { &hf_swipe_policy_id,    { "Policy identifier",    "swipe.policy_id",    FT_UINT16, BASE_DEC, NULL,                      0x0, NULL, HFILL } },

        { &hf_swipe_packet_seq,     { "Packet sequence number",     "swipe.packet_seq",     FT_UINT32, BASE_DEC, NULL,                      0x0, NULL, HFILL } },

        { &hf_swipe_authenticator,   { "Authenticator",   "swipe.authenticator",   FT_BYTES, BASE_NONE, NULL,                      0x0, NULL, HFILL } },

    };

    /* Setup protocol subtree array */

    static int *ett[] = {

        &ett_swipe

    };

    /* Register the protocol name and description */

    proto_swipe = proto_register_protocol("swIPe IP Security Protocol", "swIPe", "swipe");

    /* Register the dissector handle */

    swipe_handle = register_dissector("swipe", dissect_swipe, proto_swipe);

    /* Required function calls to register the header fields and subtrees used */

    proto_register_field_array(proto_swipe, hf, array_length(hf));

    proto_register_subtree_array(ett, array_length(ett));

}

void

proto_reg_handoff_swipe(void)

{

    dissector_add_uint("ip.proto", IP_PROTO_SWIPE_DEPRECATED, swipe_handle);

    ipv6_handle = find_dissector_add_dependency("ipv6", proto_swipe );

}

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