Function send_client_reply_packet

sql-common/client.c:2574–2783

sends a client authentication packet (second packet in the 3-way handshake) Packet format (when the server is 4.0 or earlier): Bytes Content ----- ---- 2 client capabilities 3 max packet size n user name, \0-terminated 9 scramble_323, \0-terminated Packet format (when the server is 4.1 or newer): Bytes

  @retval 1 error
*/
static int send_client_reply_packet(MCPVIO_EXT *mpvio,
                                    const uchar *data, int data_len)
{
  MYSQL *mysql= mpvio->mysql;
  NET *net= &mysql->net;
  char *buff, *end;
  size_t buff_size;
  size_t connect_attrs_len=
    (mysql->server_capabilities & CLIENT_CONNECT_ATTRS &&
     mysql->options.extension) ?
    mysql->options.extension->connection_attributes_length : 0;

  DBUG_ASSERT(connect_attrs_len < MAX_CONNECTION_ATTR_STORAGE_LENGTH);

  
  /*
    see end= buff+32 below, fixed size of the packet is 32 bytes.
     +9 because data is a length encoded binary where meta data size is max 9.
  */
  buff_size= 33 + USERNAME_LENGTH + data_len + 9 + NAME_LEN + NAME_LEN + connect_attrs_len + 9;
  buff= my_alloca(buff_size);

  mysql->client_flag|= mysql->options.client_flag;
  mysql->client_flag|= CLIENT_CAPABILITIES;

  if (mysql->client_flag & CLIENT_MULTI_STATEMENTS)
    mysql->client_flag|= CLIENT_MULTI_RESULTS;

#if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
  if (mysql->options.ssl_key || mysql->options.ssl_cert ||
      mysql->options.ssl_ca || mysql->options.ssl_capath ||
      mysql->options.ssl_cipher ||
      (mysql->options.extension && mysql->options.extension->ssl_crl) || 
      (mysql->options.extension && mysql->options.extension->ssl_crlpath))
    mysql->options.use_ssl= 1;
  if (mysql->options.use_ssl)
    mysql->client_flag|= CLIENT_SSL;
#endif /* HAVE_OPENSSL && !EMBEDDED_LIBRARY*/
  if (mpvio->db)
    mysql->client_flag|= CLIENT_CONNECT_WITH_DB;
  else
    mysql->client_flag&= ~CLIENT_CONNECT_WITH_DB;

  /* Remove options that server doesn't support */
  mysql->client_flag= mysql->client_flag &
                       (~(CLIENT_COMPRESS | CLIENT_SSL | CLIENT_PROTOCOL_41) 
                       | mysql->server_capabilities);

#ifndef HAVE_COMPRESS
  mysql->client_flag&= ~CLIENT_COMPRESS;
#endif

  if (mysql->client_flag & CLIENT_PROTOCOL_41)
  {
    /* 4.1 server and 4.1 client has a 32 byte option flag */
    int4store(buff,mysql->client_flag);
    int4store(buff+4, net->max_packet_size);
    buff[8]= (char) mysql->charset->number;