path: root/epan/dissectors/packet-fcsp.c

/* packet-fc-sp.c
 * Routines for Fibre Channel Security Protocol (FC-SP)
 * This decoder is for FC-SP version 1.1
 * Copyright 2003, Dinesh G Dutt <ddutt@cisco.com>
 *
 * 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 <epan/to_str.h>
#include <epan/expert.h>

void proto_register_fcsp(void);

/* Message Codes */
#define FC_AUTH_MSG_AUTH_REJECT        0x0A
#define FC_AUTH_MSG_AUTH_NEGOTIATE     0x0B
#define FC_AUTH_MSG_AUTH_DONE          0x0C
#define FC_AUTH_DHCHAP_CHALLENGE       0x10
#define FC_AUTH_DHCHAP_REPLY           0x11
#define FC_AUTH_DHCHAP_SUCCESS         0x12
#define FC_AUTH_FCAP_REQUEST           0x13
#define FC_AUTH_FCAP_ACKNOWLEDGE       0x14
#define FC_AUTH_FCAP_CONFIRM           0x15
#define FC_AUTH_FCPAP_INIT             0x16
#define FC_AUTH_FCPAP_ACCEPT           0x17
#define FC_AUTH_FCPAP_COMPLETE         0x18

#define FC_AUTH_NAME_TYPE_WWN          0x1

#define FC_AUTH_PROTO_TYPE_DHCHAP      0x1
#define FC_AUTH_PROTO_TYPE_FCAP        0x2

#define FC_AUTH_DHCHAP_HASH_MD5        0x5
#define FC_AUTH_DHCHAP_HASH_SHA1       0x6

#define FC_AUTH_DHCHAP_PARAM_HASHLIST  0x1
#define FC_AUTH_DHCHAP_PARAM_DHgIDLIST 0x2

/* Initialize the protocol and registered fields */
static int proto_fcsp;
static int hf_auth_proto_ver;
static int hf_auth_msg_code;
static int hf_auth_flags;
static int hf_auth_len;
static int hf_auth_tid;
static int hf_auth_initiator_wwn;
static int hf_auth_initiator_name;
static int hf_auth_usable_proto;
static int hf_auth_rjt_code;
static int hf_auth_rjt_codedet;
static int hf_auth_responder_wwn;
static int hf_auth_responder_name;
/* static int hf_auth_dhchap_groupid; */
/* static int hf_auth_dhchap_hashid; */
static int hf_auth_dhchap_chal_len;
static int hf_auth_dhchap_val_len;
static int hf_auth_dhchap_rsp_len;
static int hf_auth_initiator_name_type;
static int hf_auth_initiator_name_len;
static int hf_auth_responder_name_len;
static int hf_auth_responder_name_type;
static int hf_auth_proto_type;
static int hf_auth_proto_param_len;
static int hf_auth_dhchap_param_tag;
static int hf_auth_dhchap_param_len;
static int hf_auth_dhchap_hash_type;
static int hf_auth_dhchap_group_type;
static int hf_auth_dhchap_dhvalue;
static int hf_auth_dhchap_chal_value;
static int hf_auth_dhchap_rsp_value;

/* Initialize the subtree pointers */
static int ett_fcsp;

static expert_field ei_auth_fcap_undecoded;

static const value_string fcauth_msgcode_vals[] = {
    {FC_AUTH_MSG_AUTH_REJECT,    "AUTH_Reject"},
    {FC_AUTH_MSG_AUTH_NEGOTIATE, "AUTH_Negotiate"},
    {FC_AUTH_MSG_AUTH_DONE,      "AUTH_Done"},
    {FC_AUTH_DHCHAP_CHALLENGE,   "DHCHAP_Challenge"},
    {FC_AUTH_DHCHAP_REPLY,       "DHCHAP_Reply"},
    {FC_AUTH_DHCHAP_SUCCESS,     "DHCHAP_Success"},
    {FC_AUTH_FCAP_REQUEST,       "FCAP_Request"},
    {FC_AUTH_FCAP_ACKNOWLEDGE,   "FCAP_Acknowledge"},
    {FC_AUTH_FCAP_CONFIRM,       "FCAP_Confirm"},
    {FC_AUTH_FCPAP_INIT,         "FCPAP_Init"},
    {FC_AUTH_FCPAP_ACCEPT,       "FCPAP_Accept"},
    {FC_AUTH_FCPAP_COMPLETE,     "FCPAP_Complete"},
    {0, NULL},
};

static const value_string fcauth_rjtcode_vals[] = {
    {0x01, "Authentication Failure"},
    {0x02, "Logical Error"},
    {0, NULL},
};

static const value_string fcauth_rjtcode_detail_vals[] = {
    {0x01, "Authentication Mechanism Not Usable"},
    {0x02, "DH Group Not Usable"},
    {0x03, "Hash Algorithm Not Usable"},
    {0x04, "Authentication Protocol Instance Already Started"},
    {0x05, "Authentication Failed "},
    {0x06, "Incorrect Payload "},
    {0x07, "Incorrect Authentication Protocol Message"},
    {0x08, "Protocol Reset"},
    {0, NULL},
};

static const value_string fcauth_dhchap_param_vals[] = {
    {FC_AUTH_DHCHAP_PARAM_HASHLIST,  "HashList"},
    {FC_AUTH_DHCHAP_PARAM_DHgIDLIST, "DHgIDList"},
    {0, NULL},
};

static const value_string fcauth_dhchap_hash_algo_vals[] = {
    {FC_AUTH_DHCHAP_HASH_MD5,  "MD5"},
    {FC_AUTH_DHCHAP_HASH_SHA1, "SHA-1"},
    {0, NULL},
};

static const value_string fcauth_name_type_vals[] = {
    {FC_AUTH_NAME_TYPE_WWN, "WWN"},
    {0, NULL},
};

static const value_string fcauth_proto_type_vals[] = {
    {FC_AUTH_PROTO_TYPE_DHCHAP, "DHCHAP"},
    {FC_AUTH_PROTO_TYPE_FCAP,   "FCAP"},
    {0, NULL},
};

static const value_string fcauth_dhchap_dhgid_vals[] = {
    {0, "DH NULL"},
    {1, "DH Group 1024"},
    {2, "DH Group 1280"},
    {3, "DH Group 1536"},
    {4, "DH Group 2048"},
    {0, NULL},
};

/* this format is required because a script is used to build the C function
   that calls all the protocol registration.
*/

static void dissect_fcsp_dhchap_auth_param(tvbuff_t *tvb, proto_tree *tree,
                                     int offset, int32_t total_len)
{
    uint16_t auth_param_tag;
    uint16_t param_len, i;

    if (tree) {
        total_len -= 4;

        while (total_len > 0) {
            proto_tree_add_item(tree, hf_auth_dhchap_param_tag, tvb, offset,
                                2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tree, hf_auth_dhchap_param_len, tvb, offset+2,
                                2, ENC_BIG_ENDIAN);

            auth_param_tag = tvb_get_ntohs(tvb, offset);
            param_len = tvb_get_ntohs(tvb, offset+2)*4;

            switch (auth_param_tag) {
            case FC_AUTH_DHCHAP_PARAM_HASHLIST:
                offset += 4;
                total_len -= 4;
                for (i = 0; i < param_len; i += 4) {
                    proto_tree_add_item(tree, hf_auth_dhchap_hash_type, tvb,
                                        offset, 4, ENC_BIG_ENDIAN);
                    offset += 4;
                }
                break;
            case FC_AUTH_DHCHAP_PARAM_DHgIDLIST:
                offset += 4;
                total_len -= 4;
                for (i = 0; i < param_len; i += 4) {
                    proto_tree_add_item(tree, hf_auth_dhchap_group_type, tvb,
                                        offset, 4, ENC_BIG_ENDIAN);
                    offset += 4;
                }
                break;
            default:
                /* If we don't recognize the auth_param_tag and the param_len
                 * is 0 then just return to prevent an infinite loop. See
                 * https://gitlab.com/wireshark/wireshark/-/issues/8359
                 */
                if (param_len == 0) {
                    return;
                }
                break;
            }

            total_len -= param_len;
        }
    }
}

static void dissect_fcsp_dhchap_challenge(tvbuff_t *tvb, proto_tree *tree)
{
    int     offset = 12;
    uint16_t name_type;
    uint16_t param_len, name_len;

    if (tree) {
        proto_tree_add_item(tree, hf_auth_responder_name_type, tvb, offset,
                            2, ENC_BIG_ENDIAN);
        name_type = tvb_get_ntohs(tvb, offset);

        proto_tree_add_item(tree, hf_auth_responder_name_len, tvb, offset+2,
                            2, ENC_BIG_ENDIAN);

        name_len = tvb_get_ntohs(tvb, offset+2);

        if (name_type == FC_AUTH_NAME_TYPE_WWN) {
            proto_tree_add_item(tree, hf_auth_responder_wwn, tvb, offset+4,
                                  8, ENC_NA);
        }
        else {
            proto_tree_add_item(tree, hf_auth_responder_name, tvb, offset+4,
                                name_len, ENC_NA);
        }
        offset += (4+name_len);

        proto_tree_add_item(tree, hf_auth_dhchap_hash_type, tvb, offset,
                            4, ENC_BIG_ENDIAN);
        proto_tree_add_item(tree, hf_auth_dhchap_group_type, tvb, offset+4,
                            4, ENC_BIG_ENDIAN);
        proto_tree_add_item(tree, hf_auth_dhchap_chal_len, tvb, offset+8,
                            4, ENC_BIG_ENDIAN);
        param_len = tvb_get_ntohl(tvb, offset+8);

        proto_tree_add_item(tree, hf_auth_dhchap_chal_value, tvb, offset+12,
                            param_len, ENC_NA);
        offset += (param_len + 12);

        proto_tree_add_item(tree, hf_auth_dhchap_val_len, tvb, offset, 4, ENC_BIG_ENDIAN);
        param_len = tvb_get_ntohl(tvb, offset);

        proto_tree_add_item(tree, hf_auth_dhchap_dhvalue, tvb, offset+4,
                            param_len, ENC_NA);
    }
}


static void dissect_fcsp_dhchap_reply(tvbuff_t *tvb, proto_tree *tree)
{
    int     offset = 12;
    uint32_t param_len;

    if (tree) {
        proto_tree_add_item(tree, hf_auth_dhchap_rsp_len, tvb, offset, 4, ENC_BIG_ENDIAN);
        param_len = tvb_get_ntohl(tvb, offset);

        proto_tree_add_item(tree, hf_auth_dhchap_rsp_value, tvb, offset+4,
                            param_len, ENC_NA);
        offset += (param_len + 4);

        proto_tree_add_item(tree, hf_auth_dhchap_val_len, tvb, offset, 4, ENC_BIG_ENDIAN);
        param_len = tvb_get_ntohl(tvb, offset);

        proto_tree_add_item(tree, hf_auth_dhchap_dhvalue, tvb, offset+4,
                            param_len, ENC_NA);
        offset += (param_len + 4);

        proto_tree_add_item(tree, hf_auth_dhchap_chal_len, tvb, offset, 4, ENC_BIG_ENDIAN);
        param_len = tvb_get_ntohl(tvb, offset);

        proto_tree_add_item(tree, hf_auth_dhchap_chal_value, tvb, offset+4,
                            param_len, ENC_NA);
    }
}

static void dissect_fcsp_dhchap_success(tvbuff_t *tvb, proto_tree *tree)
{
    int     offset = 12;
    uint32_t param_len;

    if (tree) {
        proto_tree_add_item(tree, hf_auth_dhchap_rsp_len, tvb, offset, 4, ENC_BIG_ENDIAN);
        param_len = tvb_get_ntohl(tvb, offset);

        proto_tree_add_item(tree, hf_auth_dhchap_rsp_value, tvb, offset+4,
                            param_len, ENC_NA);
    }
}


static void dissect_fcsp_auth_negotiate(tvbuff_t *tvb, proto_tree *tree)
{
    int     offset = 12;
    uint16_t name_type, name_len, proto_type, param_len;
    uint32_t num_protos, i;

    if (tree) {
        proto_tree_add_item(tree, hf_auth_initiator_name_type, tvb, offset,
                            2, ENC_BIG_ENDIAN);
        name_type = tvb_get_ntohs(tvb, offset);

        proto_tree_add_item(tree, hf_auth_initiator_name_len, tvb, offset+2,
                            2, ENC_BIG_ENDIAN);
        name_len = tvb_get_ntohs(tvb, offset+2);

        if (name_type == FC_AUTH_NAME_TYPE_WWN) {
            proto_tree_add_item(tree, hf_auth_initiator_wwn, tvb, offset+4, 8, ENC_NA);
        }
        else {
            proto_tree_add_item(tree, hf_auth_initiator_name, tvb, offset+4,
                                name_len, ENC_NA);
        }

        offset += (4+name_len);

        proto_tree_add_item(tree, hf_auth_usable_proto, tvb, offset, 4, ENC_BIG_ENDIAN);
        num_protos = tvb_get_ntohl(tvb, offset);
        offset += 4;

        for (i = 0; i < num_protos; i++) {
            proto_tree_add_item(tree, hf_auth_proto_param_len, tvb, offset, 4, ENC_BIG_ENDIAN);
            param_len = tvb_get_ntohl(tvb, offset);
            offset += 4;

            if (tvb_bytes_exist(tvb, offset, param_len)) {
                proto_type = tvb_get_ntohl(tvb, offset);

                proto_tree_add_item(tree, hf_auth_proto_type, tvb, offset, 4, ENC_BIG_ENDIAN);
                switch (proto_type) {
                case FC_AUTH_PROTO_TYPE_DHCHAP:
                    dissect_fcsp_dhchap_auth_param(tvb, tree, offset+4, param_len);
                    break;
                case FC_AUTH_PROTO_TYPE_FCAP:
                    break;
                default:
                    break;
                }
            }
            offset += param_len;
        }
    }
}

static void dissect_fcsp_auth_done(tvbuff_t *tvb _U_, proto_tree *tree _U_)
{
}

static void dissect_fcsp_auth_rjt(tvbuff_t *tvb, proto_tree *tree)
{
    int offset = 12;

    if (tree) {
        proto_tree_add_item(tree, hf_auth_rjt_code, tvb, offset, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(tree, hf_auth_rjt_codedet, tvb, offset+1, 1, ENC_BIG_ENDIAN);
    }
}

static int dissect_fcsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
    proto_item *ti        = NULL;
    uint8_t     opcode;
    int         offset    = 0;
    proto_tree *fcsp_tree = NULL;

    /* Make entry in the Info column on summary display */
    opcode = tvb_get_uint8(tvb, 2);

    col_add_str(pinfo->cinfo, COL_INFO,
                     val_to_str(opcode, fcauth_msgcode_vals, "0x%x"));

    if (tree) {
        ti = proto_tree_add_protocol_format(tree, proto_fcsp, tvb, 0,
                                             tvb_captured_length(tvb), "FC-SP");
        fcsp_tree = proto_item_add_subtree(ti, ett_fcsp);

        proto_tree_add_item(fcsp_tree, hf_auth_flags, tvb, offset+1, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(fcsp_tree, hf_auth_msg_code, tvb, offset+2, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(fcsp_tree, hf_auth_proto_ver, tvb, offset+3, 1,
                            ENC_BIG_ENDIAN);
        proto_tree_add_item(fcsp_tree, hf_auth_len, tvb, offset+4, 4, ENC_BIG_ENDIAN);
        proto_tree_add_item(fcsp_tree, hf_auth_tid, tvb, offset+8, 4, ENC_BIG_ENDIAN);

        switch (opcode) {
        case FC_AUTH_MSG_AUTH_REJECT:
            dissect_fcsp_auth_rjt(tvb, tree);
            break;
        case FC_AUTH_MSG_AUTH_NEGOTIATE:
            dissect_fcsp_auth_negotiate(tvb, tree);
            break;
        case FC_AUTH_MSG_AUTH_DONE:
            dissect_fcsp_auth_done(tvb, tree);
            break;
        case FC_AUTH_DHCHAP_CHALLENGE:
            dissect_fcsp_dhchap_challenge(tvb, tree);
            break;
        case FC_AUTH_DHCHAP_REPLY:
            dissect_fcsp_dhchap_reply(tvb, tree);
            break;
        case FC_AUTH_DHCHAP_SUCCESS:
            dissect_fcsp_dhchap_success(tvb, tree);
            break;
        case FC_AUTH_FCAP_REQUEST:
        case FC_AUTH_FCAP_ACKNOWLEDGE:
        case FC_AUTH_FCAP_CONFIRM:
        case FC_AUTH_FCPAP_INIT:
        case FC_AUTH_FCPAP_ACCEPT:
        case FC_AUTH_FCPAP_COMPLETE:
            proto_tree_add_expert(fcsp_tree, pinfo, &ei_auth_fcap_undecoded, tvb, offset+12, -1);
            break;
        default:
            break;
        }
    }
    return tvb_captured_length(tvb);
}

void
proto_register_fcsp(void)
{
    /* Setup list of header fields  See Section 1.6.1 for details*/
    static hf_register_info hf[] = {
        { &hf_auth_proto_ver,
          { "Protocol Version", "fcsp.version",
            FT_UINT8, BASE_HEX, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_msg_code,
          { "Message Code", "fcsp.opcode",
            FT_UINT8, BASE_HEX, VALS(fcauth_msgcode_vals), 0x0,
            NULL, HFILL}},

        { &hf_auth_flags,
          { "Flags", "fcsp.flags",
            FT_UINT8, BASE_HEX, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_len,
          { "Packet Length", "fcsp.len",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_tid,
          { "Transaction Identifier", "fcsp.tid",
            FT_UINT32, BASE_HEX, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_initiator_wwn,
          { "Initiator Name (WWN)", "fcsp.initwwn",
            FT_FCWWN, BASE_NONE, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_initiator_name,
          { "Initiator Name (Unknown Type)", "fcsp.initname",
            FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_initiator_name_type,
          { "Initiator Name Type", "fcsp.initnametype",
            FT_UINT16, BASE_HEX, VALS(fcauth_name_type_vals), 0x0,
            NULL, HFILL}},

        { &hf_auth_initiator_name_len,
          { "Initiator Name Length", "fcsp.initnamelen",
            FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_usable_proto,
          { "Number of Usable Protocols", "fcsp.usableproto",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_rjt_code,
          { "Reason Code", "fcsp.rjtcode",
            FT_UINT8, BASE_DEC, VALS(fcauth_rjtcode_vals), 0x0,
            NULL, HFILL}},

        { &hf_auth_rjt_codedet,
          { "Reason Code Explanation", "fcsp.rjtcodet",
            FT_UINT8, BASE_DEC, VALS(fcauth_rjtcode_detail_vals), 0x0,
            NULL, HFILL}},

        { &hf_auth_responder_wwn,
          { "Responder Name (WWN)", "fcsp.rspwwn",
            FT_FCWWN, BASE_NONE, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_responder_name,
          { "Responder Name (Unknown Type)", "fcsp.rspname",
            FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_responder_name_type,
          { "Responder Name Type", "fcsp.rspnametype",
            FT_UINT16, BASE_HEX, VALS(fcauth_name_type_vals), 0x0,
            NULL, HFILL}},

        { &hf_auth_responder_name_len,
          { "Responder Name Type", "fcsp.rspnamelen",
            FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL}},

#if 0
        { &hf_auth_dhchap_hashid,
          { "Hash Identifier", "fcsp.dhchap.hashid",
            FT_UINT32, BASE_HEX, NULL, 0x0,
            NULL, HFILL}},
#endif

#if 0
        { &hf_auth_dhchap_groupid,
          { "DH Group Identifier", "fcsp.dhchap.groupid",
            FT_UINT32, BASE_HEX, NULL, 0x0,
            NULL, HFILL}},
#endif

        { &hf_auth_dhchap_chal_len,
          { "Challenge Value Length", "fcsp.dhchap.challen",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_dhchap_val_len,
          { "DH Value Length", "fcsp.dhchap.vallen",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_dhchap_rsp_len,
          { "Response Value Length", "fcsp.dhchap.rsplen",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_proto_type,
          { "Authentication Protocol Type", "fcsp.proto",
            FT_UINT32, BASE_DEC, VALS(fcauth_proto_type_vals), 0x0,
            NULL, HFILL}},

        { &hf_auth_proto_param_len,
          { "Protocol Parameters Length", "fcsp.protoparamlen",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_dhchap_param_tag,
          { "Parameter Tag", "fcsp.dhchap.paramtype",
            FT_UINT16, BASE_HEX, VALS(fcauth_dhchap_param_vals), 0x0,
            NULL, HFILL}},

        { &hf_auth_dhchap_param_len,
          { "Parameter Length", "fcsp.dhchap.paramlen",
            FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_dhchap_hash_type,
          { "Hash Algorithm", "fcsp.dhchap.hashtype",
            FT_UINT32, BASE_DEC, VALS(fcauth_dhchap_hash_algo_vals), 0x0,
            NULL, HFILL}},

        { &hf_auth_dhchap_group_type,
          { "DH Group", "fcsp.dhchap.dhgid",
            FT_UINT32, BASE_DEC, VALS(fcauth_dhchap_dhgid_vals), 0x0,
            NULL, HFILL}},

        { &hf_auth_dhchap_chal_value,
          { "Challenge Value", "fcsp.dhchap.chalval",
            FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_dhchap_dhvalue,
          { "DH Value", "fcsp.dhchap.dhvalue",
            FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL}},

        { &hf_auth_dhchap_rsp_value,
          { "Response Value", "fcsp.dhchap.rspval",
            FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL}},
    };


    /* Setup protocol subtree array */
    static int *ett[] = {
        &ett_fcsp,
    };

    static ei_register_info ei[] = {
        { &ei_auth_fcap_undecoded, { "fcsp.fcap_undecoded", PI_UNDECODED, PI_WARN, "FCAP Decoding Not Supported", EXPFILL }},
    };

    expert_module_t* expert_fcsp;

    /* Register the protocol name and description */
    proto_fcsp = proto_register_protocol("Fibre Channel Security Protocol", "FC-SP", "fcsp");

    register_dissector("fcsp", dissect_fcsp, proto_fcsp);

    proto_register_field_array(proto_fcsp, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
    expert_fcsp = expert_register_protocol(proto_fcsp);
    expert_register_field_array(expert_fcsp, ei, array_length(ei));
}

/*
 * 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:
 */