Exemple #1
0
    col_set_str(pinfo->cinfo, COL_PROTOCOL, "WSMP");

    col_set_str(pinfo->cinfo, COL_INFO, "WAVE Short Message Protocol IEEE P1609.3");

    /* create display subtree for the protocol */
    ti = proto_tree_add_item(tree, proto_wsmp, tvb, 0, -1, ENC_NA);

    wsmp_tree = proto_item_add_subtree(ti, ett_wsmp);

    offset = 0;
    proto_tree_add_item(wsmp_tree,
                        hf_wsmp_version, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset++;

    psid    = tvb_get_guint8(tvb, offset);
    psidLen = (guint32)wme_getpsidlen((guint8*)&psid);


    if (psidLen == 2)
        psid = tvb_get_ntohs(tvb, offset);
    else if (psidLen == 3)
        psid = tvb_get_ntoh24(tvb, offset);
    else if (psidLen == 4)
        psid = tvb_get_ntohl(tvb, offset);

    proto_tree_add_item(wsmp_tree,
                        hf_wsmp_psid, tvb, offset, psidLen, ENC_BIG_ENDIAN);
    offset += psidLen;


    /* TLV decoder that does not display the T and L elements */
Exemple #2
0
static void
dissect_wsmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
    /* Set up structures needed to add the protocol subtree and manage it */
    proto_item *ti, *wsmdata_item;
    proto_tree *wsmp_tree, *wsmdata_tree;
    tvbuff_t   *wsmdata_tvb;
    guint16     wsmlength, offset;
    guint32     psidLen, psid;
    guint8      elemenId, elemenLen, msb, supLen;

    /* Make entries in Protocol column and Info column on summary display */
    col_set_str(pinfo->cinfo, COL_PROTOCOL, "WSMP");

    col_set_str(pinfo->cinfo, COL_INFO, "WAVE Short Message Protocol IEEE P1609.3");

    /* create display subtree for the protocol */
    ti = proto_tree_add_item(tree, proto_wsmp, tvb, 0, -1, ENC_NA);

    wsmp_tree = proto_item_add_subtree(ti, ett_wsmp);

    offset = 0;
    proto_tree_add_item(wsmp_tree,
                        hf_wsmp_version, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset++;

    psid    = tvb_get_guint8(tvb, offset);
    psidLen = (guint32)wme_getpsidlen((guint8*)&psid);


    if (psidLen == 2)
        psid = tvb_get_ntohs(tvb, offset);
    else if (psidLen == 3)
    {
        psid = tvb_get_ntohl(tvb, offset);
        psid = psid & 0x00FFFF; /* three bytes */

    }
    else if (psidLen == 4)
        psid = tvb_get_ntohl(tvb, offset);

    proto_tree_add_item(wsmp_tree,
                        hf_wsmp_psid, tvb, offset, psidLen, ENC_BIG_ENDIAN);
    offset += psidLen;


    elemenId = tvb_get_guint8(tvb, offset);
    while ((elemenId != WSMP) && (elemenId != WSMP_S) && (elemenId != WSMP_I))
    {
        offset++;
        if (elemenId == CHANNUM)
        {
            /* channel number */
            elemenLen = tvb_get_guint8(tvb, offset);
            offset++;
            proto_tree_add_item(wsmp_tree,
                                hf_wsmp_channel, tvb, offset, elemenLen, ENC_BIG_ENDIAN);
            offset += elemenLen;
        }
        else if (elemenId == DATARATE)
        {
            /* Data rate  */
            elemenLen = tvb_get_guint8(tvb, offset);
            offset++;
            proto_tree_add_item(wsmp_tree,
                                hf_wsmp_rate, tvb, offset, elemenLen, ENC_BIG_ENDIAN);
            offset += elemenLen;
        }
        else if (elemenId == TRANSMITPW)
        {
            /* Transmit power */
            elemenLen = tvb_get_guint8(tvb, offset);
            offset++;
            proto_tree_add_item(wsmp_tree,
                                hf_wsmp_txpower, tvb, offset, elemenLen, ENC_BIG_ENDIAN);
            offset += elemenLen;
        }
        elemenId  = tvb_get_guint8(tvb, offset);
    }

    proto_tree_add_item(wsmp_tree,
                        hf_wsmp_WAVEid, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset++;

    wsmlength = tvb_get_letohs( tvb, offset);
    proto_tree_add_item(wsmp_tree,
                        hf_wsmp_wsmlength, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    if (elemenId == WSMP_S)
    {
        msb    = 1;
        supLen = 0;
        while (msb)
        {
            msb = tvb_get_guint8(tvb, offset + supLen);
            msb = msb & 0x80;
            supLen++;
        }
        proto_tree_add_item(wsmp_tree,
                            hf_wsmp_WSMP_S_data, tvb, offset, supLen, ENC_BIG_ENDIAN);
        wsmlength -= supLen;
        offset    += supLen;
    }

    wsmdata_item = proto_tree_add_text (wsmp_tree, tvb, offset, wsmlength,
                                        "Wave Short Message");
    wsmdata_tree = proto_item_add_subtree(wsmdata_item, ett_wsmdata);

    wsmdata_tvb  = tvb_new_subset(tvb, offset, -1, wsmlength);

    /* TODO: Branch on the application context and display accordingly
     * Default: call the data dissector
     */
    if (psid == 0xbff0)
    {
        call_dissector(data_handle, wsmdata_tvb, pinfo, wsmdata_tree);
    }
}