/* packet-dcerpc-ndr.c
 * Routines for DCERPC NDR dissection
 * Copyright 2001, Todd Sabin <tas@webspan.net>
 *
 * $Id$
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <glib.h>

#include <epan/packet.h>
#include <epan/emem.h>
#include "packet-dcerpc.h"


/*
 * The NDR routines are for use by dcerpc subdissetors.  They're
 * primarily for making sure things are aligned properly according
 * to the rules of NDR.
 */

int
dissect_ndr_uint8(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                  proto_tree *tree, guint8 *drep,
                  int hfindex, guint8 *pdata)
{
    dcerpc_info *di;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }

    /* no alignment needed */
    return dissect_dcerpc_uint8(tvb, offset, pinfo,
                                tree, drep, hfindex, pdata);
}

int
PIDL_dissect_uint8(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                   proto_tree *tree, guint8 *drep,
                   int hfindex, guint32 param _U_)
{
    dcerpc_info *di;
    guint8       val;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }

    /* no alignment needed */
    offset = dissect_dcerpc_uint8(tvb, offset, pinfo,
                                  tree, drep, hfindex, &val);

    if (param&PIDL_SET_COL_INFO) {
        header_field_info *hf_info;
        char *valstr;

        hf_info = proto_registrar_get_nth(hfindex);

        valstr = ep_alloc(64);
        valstr[0]=0;

        switch (hf_info->display) {
        case BASE_DEC:
            if (hf_info->strings) {
                g_snprintf(valstr, 64, "%s(%d)",val_to_str(val, hf_info->strings, "Unknown:%u"), val);
            } else {
                g_snprintf(valstr, 64, "%d", val);
            }
            break;
        case BASE_HEX:
            if (hf_info->strings) {
                g_snprintf(valstr, 64, "%s(0x%02x)",val_to_str(val, hf_info->strings, "Unknown:%u"), val);
            } else {
                g_snprintf(valstr, 64, "0x%02x", val);
            }
            break;
        default:
            REPORT_DISSECTOR_BUG("Invalid hf->display value");
        }

        if (check_col(pinfo->cinfo, COL_INFO)) {
            col_append_fstr(pinfo->cinfo, COL_INFO," %s:%s", hf_info->name, valstr);
        }
    }

    return offset;
}


int
dissect_ndr_uint16(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                   proto_tree *tree, guint8 *drep,
                   int hfindex, guint16 *pdata)
{
    dcerpc_info *di;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }


    if (!di->no_align && (offset % 2)) {
        offset++;
    }
    return dissect_dcerpc_uint16(tvb, offset, pinfo,
                                 tree, drep, hfindex, pdata);
}

int
PIDL_dissect_uint16(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                    proto_tree *tree, guint8 *drep,
                    int hfindex, guint32 param _U_)
{
    dcerpc_info *di;
    guint16      val;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }


    if (!di->no_align && (offset % 2)) {
        offset++;
    }
    offset = dissect_dcerpc_uint16(tvb, offset, pinfo,
                                   tree, drep, hfindex, &val);

    if (param&PIDL_SET_COL_INFO) {
        header_field_info *hf_info;
        char *valstr;

        hf_info = proto_registrar_get_nth(hfindex);

        valstr = ep_alloc(64);
        valstr[0]=0;

        switch (hf_info->display) {
        case BASE_DEC:
            if (hf_info->strings) {
                g_snprintf(valstr, 64, "%s(%d)",val_to_str(val, hf_info->strings, "Unknown:%u"), val);
            } else {
                g_snprintf(valstr, 64, "%d", val);
            }
            break;
        case BASE_HEX:
            if (hf_info->strings) {
                g_snprintf(valstr, 64, "%s(0x%04x)",val_to_str(val, hf_info->strings, "Unknown:%u"), val);
            } else {
                g_snprintf(valstr, 64, "0x%04x", val);
            }
            break;
        default:
            REPORT_DISSECTOR_BUG("Invalid hf->display value");
        }

        if (check_col(pinfo->cinfo, COL_INFO)) {
            col_append_fstr(pinfo->cinfo, COL_INFO," %s:%s", hf_info->name, valstr);
        }
    }

    return offset;
}

int
dissect_ndr_uint32(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                   proto_tree *tree, guint8 *drep,
                   int hfindex, guint32 *pdata)
{
    dcerpc_info *di;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }


    if (!di->no_align && (offset % 4)) {
        offset += 4 - (offset % 4);
    }
    return dissect_dcerpc_uint32(tvb, offset, pinfo,
                                 tree, drep, hfindex, pdata);
}

/* This is used to dissect the new datatypes, such as pointers and conformance
   data, which is 4 bytes in size in NDR but 8 bytes in NDR64.
*/
int
dissect_ndr_uint3264(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                     proto_tree *tree, guint8 *drep,
                     int hfindex, guint3264 *pdata)
{
    dcerpc_info *di;

    di = pinfo->private_data;

    if (di->call_data->flags & DCERPC_IS_NDR64) {
        return dissect_ndr_uint64(tvb, offset, pinfo, tree, drep, hfindex, pdata);
    } else {
        guint32 val = 0;
        offset = dissect_ndr_uint32(tvb, offset, pinfo, tree, drep, hfindex, &val);
        if (pdata) {
            *pdata = val;
        }
        return offset;
    }
}

/* This is used to dissect the new datatypes, such as enums
   that are 2 bytes in size in NDR but 4 bytes in NDR64.
*/
int
dissect_ndr_uint1632(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                     proto_tree *tree, guint8 *drep,
                     int hfindex, guint1632 *pdata)
{
    dcerpc_info *di;

    di = pinfo->private_data;

    if (di->call_data->flags & DCERPC_IS_NDR64) {
        return dissect_ndr_uint32(tvb, offset, pinfo, tree, drep, hfindex, pdata);
    } else {
        guint16 val = 0;
        offset = dissect_ndr_uint16(tvb, offset, pinfo, tree, drep, hfindex, &val);
        if (pdata) {
            *pdata = val;
        }
        return offset;
    }
}

int
PIDL_dissect_uint32(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                    proto_tree *tree, guint8 *drep,
                    int hfindex, guint32 param)
{
    dcerpc_info *di;
    guint32      val;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }


    if (!di->no_align && (offset % 4)) {
        offset += 4 - (offset % 4);
    }
    offset = dissect_dcerpc_uint32(tvb, offset, pinfo,
                                   tree, drep, hfindex, &val);

    if (param&PIDL_SET_COL_INFO) {
        header_field_info *hf_info;
        char *valstr;

        hf_info = proto_registrar_get_nth(hfindex);

        valstr = ep_alloc(64);
        valstr[0]=0;

        switch (hf_info->display) {
        case BASE_DEC:
            if (hf_info->strings) {
                g_snprintf(valstr, 64, "%s(%d)",val_to_str(val, hf_info->strings, "Unknown:%u"), val);
            } else {
                g_snprintf(valstr, 64, "%d", val);
            }
            break;
        case BASE_HEX:
            if (hf_info->strings) {
                g_snprintf(valstr, 64, "%s(0x%08x)",val_to_str(val, hf_info->strings, "Unknown:%u"), val);
            } else {
                g_snprintf(valstr, 64, "0x%08x", val);
            }
            break;
        default:
            REPORT_DISSECTOR_BUG("Invalid hf->display value");
        }

        if (check_col(pinfo->cinfo, COL_INFO)) {
            col_append_fstr(pinfo->cinfo, COL_INFO," %s:%s", hf_info->name, valstr);
        }
    }

    return offset;
}

/* Double uint32
   This function dissects the 64bit datatype that is common for
   ms interfaces and which is 32bit aligned.
   It is really just 2 uint32's
*/
int
dissect_ndr_duint32(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                    proto_tree *tree, guint8 *drep,
                    int hfindex, guint64 *pdata)
{
    dcerpc_info *di;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }

    if (!di->no_align && (offset % 4)) {
        offset += 4 - (offset % 4);
    }
    return dissect_dcerpc_uint64(tvb, offset, pinfo,
                                 tree, drep, hfindex, pdata);
}

/* uint64 : hyper
   a 64 bit integer  aligned to proper 8 byte boundaries
*/
int
dissect_ndr_uint64(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                   proto_tree *tree, guint8 *drep,
                   int hfindex, guint64 *pdata)
{
    dcerpc_info *di;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }

    if (!di->no_align && (offset % 8)) {
        offset += 8 - (offset % 8);
    }
    return dissect_dcerpc_uint64(tvb, offset, pinfo,
                                 tree, drep, hfindex, pdata);
}

int
PIDL_dissect_uint64(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                    proto_tree *tree, guint8 *drep,
                    int hfindex, guint32 param _U_)
{
    dcerpc_info *di;
    guint64      val;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }

    if (!di->no_align && (offset % 8)) {
        offset += 8 - (offset % 8);
    }
    offset = dissect_dcerpc_uint64(tvb, offset, pinfo,
                                   tree, drep, hfindex, &val);

    if (param&PIDL_SET_COL_INFO) {
        header_field_info *hf_info;
        char *valstr;

        hf_info = proto_registrar_get_nth(hfindex);

        valstr = ep_alloc(64);
        valstr[0]=0;

        switch (hf_info->display) {
        case BASE_DEC:
            if (hf_info->strings) {
                g_snprintf(valstr, 64, "%s(%" G_GINT64_MODIFIER "u)",val_to_str( (guint32) val, hf_info->strings, "Unknown:%u"), val);
            } else {
                g_snprintf(valstr, 64, "%" G_GINT64_MODIFIER "u", val);
            }
            break;
        case BASE_HEX:
            if (hf_info->strings) {
                g_snprintf(valstr, 64, "%s(0x%" G_GINT64_MODIFIER "x)",val_to_str( (guint32) val, hf_info->strings, "Unknown:%u"), val);
            } else {
                g_snprintf(valstr, 64, "0x%" G_GINT64_MODIFIER "x", val);
            }
            break;
        default:
            REPORT_DISSECTOR_BUG("Invalid hf->display value");
        }

        if (check_col(pinfo->cinfo, COL_INFO)) {
            col_append_fstr(pinfo->cinfo, COL_INFO," %s:%s", hf_info->name, valstr);
        }
    }

    return offset;
}

int
dissect_ndr_float(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                  proto_tree *tree, guint8 *drep,
                  int hfindex, gfloat *pdata)
{
    dcerpc_info *di;


    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }

    if (!di->no_align && (offset % 4)) {
        offset += 4 - (offset % 4);
    }
    return dissect_dcerpc_float(tvb, offset, pinfo,
                                tree, drep, hfindex, pdata);
}


int
dissect_ndr_double(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                   proto_tree *tree, guint8 *drep,
                   int hfindex, gdouble *pdata)
{
    dcerpc_info *di;


    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }

    if (!di->no_align && (offset % 8)) {
        offset += 8 - (offset % 8);
    }
    return dissect_dcerpc_double(tvb, offset, pinfo,
                                 tree, drep, hfindex, pdata);
}

/* handles unix 32 bit time_t */
int
dissect_ndr_time_t(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                   proto_tree *tree, guint8 *drep,
                   int hfindex, guint32 *pdata)
{
    dcerpc_info *di;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }


    if (!di->no_align && (offset % 4)) {
        offset += 4 - (offset % 4);
    }
    return dissect_dcerpc_time_t(tvb, offset, pinfo,
                                 tree, drep, hfindex, pdata);
}

int
dissect_ndr_uuid_t(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                   proto_tree *tree, guint8 *drep,
                   int hfindex, e_uuid_t *pdata)
{
    dcerpc_info *di;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }

    /* uuid's are aligned to 4 bytes, due to initial uint32 in struct */
    if (!di->no_align && (offset % 4)) {
        offset += 4 - (offset % 4);
    }
    return dissect_dcerpc_uuid_t(tvb, offset, pinfo,
                                 tree, drep, hfindex, pdata);
}

/*
 * XXX - at least according to the DCE RPC 1.1 "nbase.idl", an
 * "ndr_context_handle" is an unsigned32 "context_handle_attributes"
 * and a uuid_t "context_handle_uuid".  The attributes do not appear to
 * be used, and always appear to be set to 0, in the DCE RPC 1.1 code.
 *
 * Should we display an "ndr_context_handle" with a tree holding the
 * attributes and the uuid_t?
 */
int
dissect_ndr_ctx_hnd(tvbuff_t *tvb, gint offset, packet_info *pinfo,
                    proto_tree *tree, guint8 *drep,
                    int hfindex, e_ctx_hnd *pdata)
{
    static e_ctx_hnd ctx_hnd;
    dcerpc_info *di;

    di = pinfo->private_data;
    if (di->conformant_run) {
        /* just a run to handle conformant arrays, no scalars to dissect */
        return offset;
    }

    if (!di->no_align && (offset % 2)) {
        offset += 4 - (offset % 4);
    }
    ctx_hnd.attributes = dcerpc_tvb_get_ntohl(tvb, offset, drep);
    dcerpc_tvb_get_uuid(tvb, offset+4, drep, &ctx_hnd.uuid);
    if (tree) {
        /* Bytes is bytes - don't worry about the data representation */
        proto_tree_add_item(tree, hfindex, tvb, offset, 20, ENC_NA);
    }
    if (pdata) {
        *pdata = ctx_hnd;
    }
    return offset + 20;
}