~drizzle-trunk/drizzle/development

/*

 * Drizzle Client & Protocol Library

 *

 * Copyright (C) 2008 Eric Day (eday@oddments.org)

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are

 * met:

 *

 *     * Redistributions of source code must retain the above copyright

 * notice, this list of conditions and the following disclaimer.

 *

 *     * Redistributions in binary form must reproduce the above

 * copyright notice, this list of conditions and the following disclaimer

 * in the documentation and/or other materials provided with the

 * distribution.

 *

 *     * The names of its contributors may not be used to endorse or

 * promote products derived from this software without specific prior

 * written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 */

/**

 * @file

 * @brief Packing definitions

 */

#include "common.h"

/*

 * Private declarations

 */

/**

 * @addtogroup drizzle_pack_private Private Packing Functions

 * @ingroup drizzle_pack

 * @{

 */

/**

 * Compute hash from password and scramble.

 */

static drizzle_return_t _pack_scramble_hash(drizzle_con_st *con,

                                            uint8_t *buffer);

/** @} */

/*

 * Public definitions

 */

uint8_t *drizzle_pack_length(uint64_t number, uint8_t *ptr)

{

  if (number < 251)

  {

    ptr[0]= (uint8_t)number;

    ptr++;

  }

  else if (number < 65536)

  {

    ptr[0]= 252;

    ptr++;

    drizzle_set_byte2(ptr, number);

    ptr+= 2;

  }

  else if (number < 16777216)

  {

    ptr[0]= 253;

    ptr++;

    drizzle_set_byte3(ptr, number);

    ptr+= 3;

  }

  else

  {

    ptr[0]= 254;

    ptr++;

    drizzle_set_byte8(ptr, number);

    ptr+= 8;

  }

  return ptr;

}

uint64_t drizzle_unpack_length(drizzle_con_st *con, drizzle_return_t *ret_ptr)

{

  uint64_t length;

  uint8_t bytes;

  if (con->buffer_ptr[0] < 251)

  {

    length= (uint64_t)(con->buffer_ptr[0]);

    bytes= 1;

  }

  else if (con->buffer_ptr[0] == 251)

  {

    con->buffer_ptr++;

    con->buffer_size--;

    con->packet_size--;

    *ret_ptr= DRIZZLE_RETURN_NULL_SIZE;

    return 0;

  }

  else if (con->buffer_ptr[0] == 252 && con->buffer_size > 2)

  {

    length= drizzle_get_byte2(con->buffer_ptr + 1);

    bytes= 3;

  }

  else if (con->buffer_ptr[0] == 253 && con->buffer_size > 3)

  {

    length= drizzle_get_byte3(con->buffer_ptr + 1);

    bytes= 4;

  }

  else if (con->buffer_size > 8)

  {

    length= drizzle_get_byte8(con->buffer_ptr + 1);

    bytes= 9;

  }

  else

  {

    *ret_ptr= DRIZZLE_RETURN_IO_WAIT;

    return 0;

  }

  con->buffer_ptr+= bytes;

  con->buffer_size-= bytes;

  con->packet_size-= bytes;

  *ret_ptr= DRIZZLE_RETURN_OK;

  return length;

}

uint8_t *drizzle_pack_string(char *string, uint8_t *ptr)

{

  uint64_t size= strlen(string);

  ptr= drizzle_pack_length(size, ptr);

  if (size > 0)

  {

    memcpy(ptr, string, (size_t)size);

    ptr+= size;

  }

  return ptr;

}

drizzle_return_t drizzle_unpack_string(drizzle_con_st *con, char *buffer,

                                       uint64_t max_length)

{

  drizzle_return_t ret= DRIZZLE_RETURN_OK;

  uint64_t length;

  length= drizzle_unpack_length(con, &ret);

  if (ret != DRIZZLE_RETURN_OK)

  {

    if (ret == DRIZZLE_RETURN_NULL_SIZE)

    {

      drizzle_set_error(con->drizzle, "drizzle_unpack_string",

                        "unexpected NULL length");

    }

    return ret;

  }

  if (length < max_length)

  {

    if (length > 0)

      memcpy(buffer, con->buffer_ptr, (size_t)length);

    buffer[length]= 0;

  }

  else

  {

    memcpy(buffer, con->buffer_ptr, (size_t)(max_length - 1));

    buffer[max_length - 1]= 0;

  }

  con->buffer_ptr+= length;

  con->buffer_size-= (size_t)length;

  con->packet_size-= (size_t)length;

  return DRIZZLE_RETURN_OK;

}

uint8_t *drizzle_pack_auth(drizzle_con_st *con, uint8_t *ptr,

                           drizzle_return_t *ret_ptr)

{

  if (con->user[0] != 0)

  {

    memcpy(ptr, con->user, strlen(con->user));

    ptr+= strlen(con->user);

  }

  ptr[0]= 0;

  ptr++;

  if (con->options & DRIZZLE_CON_RAW_SCRAMBLE && con->scramble != NULL)

  {

    ptr[0]= DRIZZLE_MAX_SCRAMBLE_SIZE;

    ptr++;

    memcpy(ptr, con->scramble, DRIZZLE_MAX_SCRAMBLE_SIZE);

    ptr+= DRIZZLE_MAX_SCRAMBLE_SIZE;

  }

  else if (con->password[0] == 0)

  {

    ptr[0]= 0;

    ptr++;

    con->packet_size-= DRIZZLE_MAX_SCRAMBLE_SIZE;

  }

  else

  {

    ptr[0]= DRIZZLE_MAX_SCRAMBLE_SIZE;

    ptr++;

    if (con->options & DRIZZLE_CON_MYSQL)

    {

      *ret_ptr= _pack_scramble_hash(con, ptr);

      if (*ret_ptr != DRIZZLE_RETURN_OK)

        return ptr;

    }

    else

      snprintf((char *)ptr, DRIZZLE_MAX_SCRAMBLE_SIZE, "%s", con->password);

    ptr+= DRIZZLE_MAX_SCRAMBLE_SIZE;

  }

  if (con->db[0] != 0)

  {

    memcpy(ptr, con->db, strlen(con->db));

    ptr+= strlen(con->db);

  }

  ptr[0]= 0;

  ptr++;

  *ret_ptr= DRIZZLE_RETURN_OK;

  return ptr;

}

/*

 * Private definitions

 */

static drizzle_return_t _pack_scramble_hash(drizzle_con_st *con,

                                            uint8_t *buffer)

{

  SHA1_CTX ctx;

  uint8_t hash_tmp1[SHA1_DIGEST_LENGTH];

  uint8_t hash_tmp2[SHA1_DIGEST_LENGTH];

  uint32_t x;

  if (SHA1_DIGEST_LENGTH != DRIZZLE_MAX_SCRAMBLE_SIZE)

  {

    drizzle_set_error(con->drizzle, "_pack_scramble_hash",

                      "SHA1 hash size mismatch:%u:%u", SHA1_DIGEST_LENGTH,

                      DRIZZLE_MAX_SCRAMBLE_SIZE);

    return DRIZZLE_RETURN_INTERNAL_ERROR;

  }

  if (con->scramble == NULL)

  {

    drizzle_set_error(con->drizzle, "_pack_scramble_hash",

                      "no scramble buffer");

    return DRIZZLE_RETURN_NO_SCRAMBLE;

  }

  /* First hash the password. */

  SHA1Init(&ctx);

  SHA1Update(&ctx, (uint8_t *)(con->password), strlen(con->password));

  SHA1Final(hash_tmp1, &ctx);

  /* Second, hash the password hash. */

  SHA1Init(&ctx);

  SHA1Update(&ctx, hash_tmp1, SHA1_DIGEST_LENGTH);

  SHA1Final(hash_tmp2, &ctx);

  /* Third, hash the scramble and the double password hash. */

  SHA1Init(&ctx);

  SHA1Update(&ctx, con->scramble, SHA1_DIGEST_LENGTH);

  SHA1Update(&ctx, hash_tmp2, SHA1_DIGEST_LENGTH);

  SHA1Final(buffer, &ctx);

  /* Fourth, xor the last hash against the first password hash. */

  for (x= 0; x < SHA1_DIGEST_LENGTH; x++)

    buffer[x]= buffer[x] ^ hash_tmp1[x];

  return DRIZZLE_RETURN_OK;

}