/* 

   Unix SMB/CIFS implementation.

   UUID/GUID functions

   Copyright (C) Theodore Ts'o               1996, 1997,

   Copyright (C) Jim McDonough                     2002.

   Copyright (C) Andrew Tridgell                   2003.

   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 3 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, see <http://www.gnu.org/licenses/>.

*/

#include "replace.h"

#include "lib/util/debug.h"

#include "lib/util/samba_util.h"

#include "lib/util/genrand.h"

#include "librpc/ndr/libndr.h"

#include "librpc/gen_ndr/ndr_misc.h"

#include "lib/util/util_str_hex.h"

_PUBLIC_ void GUID_to_ndr_buf(const struct GUID *guid,

            struct GUID_ndr_buf *buf)

{

  DATA_BLOB b = { .data = buf->buf, .length = sizeof(buf->buf), };

  enum ndr_err_code ndr_err;

  ndr_err = ndr_push_struct_into_fixed_blob(

    &b, guid, (ndr_push_flags_fn_t)ndr_push_GUID);

  SMB_ASSERT(NDR_ERR_CODE_IS_SUCCESS(ndr_err));

}

/**

  build a NDR blob from a GUID

*/

_PUBLIC_ NTSTATUS GUID_to_ndr_blob(const struct GUID *guid, TALLOC_CTX *mem_ctx, DATA_BLOB *b)

{

  struct GUID_ndr_buf buf = { .buf = {0}, };

  GUID_to_ndr_buf(guid, &buf);

  *b = data_blob_talloc(mem_ctx, buf.buf, sizeof(buf.buf));

  if (b->data == NULL) {

    return NT_STATUS_NO_MEMORY;

  }

  return NT_STATUS_OK;

}

/**

  build a GUID from a NDR data blob

*/

_PUBLIC_ NTSTATUS GUID_from_ndr_blob(const DATA_BLOB *b, struct GUID *guid)

{

  enum ndr_err_code ndr_err =

    ndr_pull_struct_blob_all_noalloc(b, guid,

             (ndr_pull_flags_fn_t)ndr_pull_GUID);

  return ndr_map_error2ntstatus(ndr_err);

}

/**

  build a GUID from a string

*/

_PUBLIC_ NTSTATUS GUID_from_data_blob(const DATA_BLOB *s, struct GUID *guid)

{

  bool ok;

  if (s->data == NULL) {

    return NT_STATUS_INVALID_PARAMETER;

  }

  if (s->length == 36) {

    ok = parse_guid_string((char *)s->data, guid);

    return ok ? NT_STATUS_OK : NT_STATUS_INVALID_PARAMETER;

  }

  if (s->length == 38) {

    if (s->data[0] != '{' || s->data[37] != '}') {

      return NT_STATUS_INVALID_PARAMETER;

    }

    ok = parse_guid_string((char *)s->data + 1, guid);

    return ok ? NT_STATUS_OK : NT_STATUS_INVALID_PARAMETER;

  }

  if (s->length == 32) {

    uint8_t buf16[16] = {0};

    DATA_BLOB blob16 = { .data = buf16, .length = sizeof(buf16) };

    size_t rlen = strhex_to_str((char *)blob16.data, blob16.length,

              (const char *)s->data, s->length);

    if (rlen != blob16.length) {

      return NT_STATUS_INVALID_PARAMETER;

    }

    return GUID_from_ndr_blob(&blob16, guid);

  }

  if (s->length == 16) {

    return GUID_from_ndr_blob(s, guid);

  }

  return NT_STATUS_INVALID_PARAMETER;

}

/**

  build a GUID from a string

*/

_PUBLIC_ NTSTATUS GUID_from_string(const char *s, struct GUID *guid)

{

  DATA_BLOB blob = data_blob_string_const(s);

  return GUID_from_data_blob(&blob, guid);

}

/**

 * generate a random GUID

 */

_PUBLIC_ struct GUID GUID_random(void)

{

  struct GUID guid;

  generate_random_buffer((uint8_t *)&guid, sizeof(guid));

  guid.clock_seq[0] = (guid.clock_seq[0] & 0x3F) | 0x80;

  guid.time_hi_and_version = (guid.time_hi_and_version & 0x0FFF) | 0x4000;

  return guid;

}

/**

 * generate an empty GUID 

 */

_PUBLIC_ struct GUID GUID_zero(void)

{

  return (struct GUID) { .time_low = 0 };

}

_PUBLIC_ bool GUID_all_zero(const struct GUID *u)

{

  if (u->time_low != 0 ||

      u->time_mid != 0 ||

      u->time_hi_and_version != 0 ||

      u->clock_seq[0] != 0 ||

      u->clock_seq[1] != 0 ||

      !all_zero(u->node, 6)) {

    return false;

  }

  return true;

}

_PUBLIC_ bool GUID_equal(const struct GUID *u1, const struct GUID *u2)

{

  return (GUID_compare(u1, u2) == 0);

}

_PUBLIC_ int GUID_compare(const struct GUID *u1, const struct GUID *u2)

{

  if (u1->time_low != u2->time_low) {

    return u1->time_low > u2->time_low ? 1 : -1;

  }

  if (u1->time_mid != u2->time_mid) {

    return u1->time_mid > u2->time_mid ? 1 : -1;

  }

  if (u1->time_hi_and_version != u2->time_hi_and_version) {

    return u1->time_hi_and_version > u2->time_hi_and_version ? 1 : -1;

  }

  if (u1->clock_seq[0] != u2->clock_seq[0]) {

    return u1->clock_seq[0] > u2->clock_seq[0] ? 1 : -1;

  }

  if (u1->clock_seq[1] != u2->clock_seq[1]) {

    return u1->clock_seq[1] > u2->clock_seq[1] ? 1 : -1;

  }

  return memcmp(u1->node, u2->node, 6);

}

/**

  its useful to be able to display these in debugging messages

*/

_PUBLIC_ char *GUID_string(TALLOC_CTX *mem_ctx, const struct GUID *guid)

{

  struct GUID_txt_buf buf;

  return talloc_strdup(mem_ctx, GUID_buf_string(guid, &buf));

}

/**

 * Does the same without allocating memory, using the structure buffer.

 * Useful for debug messages, so that you do not have to talloc_free the result

 */

_PUBLIC_ char* GUID_buf_string(const struct GUID *guid,

             struct GUID_txt_buf *dst)

{

  if (!guid) {

    return NULL;

  }

  if (sizeof(dst->buf) < 37) {

    return NULL;

  }

  dst->buf[0] = nybble_to_hex_lower(guid->time_low >> 28);

  dst->buf[1] = nybble_to_hex_lower(guid->time_low >> 24);

  dst->buf[2] = nybble_to_hex_lower(guid->time_low >> 20);

  dst->buf[3] = nybble_to_hex_lower(guid->time_low >> 16);

  dst->buf[4] = nybble_to_hex_lower(guid->time_low >> 12);

  dst->buf[5] = nybble_to_hex_lower(guid->time_low >> 8);

  dst->buf[6] = nybble_to_hex_lower(guid->time_low >> 4);

  dst->buf[7] = nybble_to_hex_lower(guid->time_low);

  dst->buf[8] = '-';

  dst->buf[9] = nybble_to_hex_lower(guid->time_mid >> 12);

  dst->buf[10] = nybble_to_hex_lower(guid->time_mid >> 8);

  dst->buf[11] = nybble_to_hex_lower(guid->time_mid >> 4);

  dst->buf[12] = nybble_to_hex_lower(guid->time_mid);

  dst->buf[13] = '-';

  dst->buf[14] = nybble_to_hex_lower(guid->time_hi_and_version >> 12);

  dst->buf[15] = nybble_to_hex_lower(guid->time_hi_and_version >> 8);

  dst->buf[16] = nybble_to_hex_lower(guid->time_hi_and_version >> 4);

  dst->buf[17] = nybble_to_hex_lower(guid->time_hi_and_version);

  dst->buf[18] = '-';

  dst->buf[19] = nybble_to_hex_lower(guid->clock_seq[0] >> 4);

  dst->buf[20] = nybble_to_hex_lower(guid->clock_seq[0]);

  dst->buf[21] = nybble_to_hex_lower(guid->clock_seq[1] >> 4);

  dst->buf[22] = nybble_to_hex_lower(guid->clock_seq[1]);

  dst->buf[23] = '-';

  dst->buf[24] = nybble_to_hex_lower(guid->node[0] >> 4);

  dst->buf[25] = nybble_to_hex_lower(guid->node[0]);

  dst->buf[26] = nybble_to_hex_lower(guid->node[1] >> 4);

  dst->buf[27] = nybble_to_hex_lower(guid->node[1]);

  dst->buf[28] = nybble_to_hex_lower(guid->node[2] >> 4);

  dst->buf[29] = nybble_to_hex_lower(guid->node[2]);

  dst->buf[30] = nybble_to_hex_lower(guid->node[3] >> 4);

  dst->buf[31] = nybble_to_hex_lower(guid->node[3]);

  dst->buf[32] = nybble_to_hex_lower(guid->node[4] >> 4);

  dst->buf[33] = nybble_to_hex_lower(guid->node[4]);

  dst->buf[34] = nybble_to_hex_lower(guid->node[5] >> 4);

  dst->buf[35] = nybble_to_hex_lower(guid->node[5]);

  dst->buf[36] = '\0';

  return dst->buf;

}

_PUBLIC_ char *GUID_string2(TALLOC_CTX *mem_ctx, const struct GUID *guid)

{

  struct GUID_txt_buf buf;

  char *ret = talloc_asprintf(

    mem_ctx, "{%s}", GUID_buf_string(guid, &buf));

  return ret;

}

_PUBLIC_ char *GUID_hexstring(TALLOC_CTX *mem_ctx, const struct GUID *guid)

{

  char *ret = NULL;

  DATA_BLOB guid_blob = { .data = NULL };

  NTSTATUS status;

  status = GUID_to_ndr_blob(guid, mem_ctx, &guid_blob);

  if (NT_STATUS_IS_OK(status)) {

    ret = data_blob_hex_string_upper(mem_ctx, &guid_blob);

  }

  TALLOC_FREE(guid_blob.data);

  return ret;

}

_PUBLIC_ bool ndr_policy_handle_empty(const struct policy_handle *h)

{

  return (h->handle_type == 0 && GUID_all_zero(&h->uuid));

}

_PUBLIC_ bool ndr_policy_handle_equal(const struct policy_handle *hnd1,

          const struct policy_handle *hnd2)

{

  if (!hnd1 || !hnd2) {

    return false;

  }

  return (memcmp(hnd1, hnd2, sizeof(*hnd1)) == 0);

}