percona-server-5.7.36-39/sql/rpl_master.cc

/* Copyright (c) 2010, 2021, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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,
   51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */


#ifdef HAVE_REPLICATION
#include "rpl_master.h"

#include "hash.h"                               // HASH
#include "m_string.h"                           // strmake
#include "auth_common.h"                        // check_global_access
#include "binlog.h"                             // mysql_bin_log
#include "debug_sync.h"                         // DEBUG_SYNC
#include "log.h"                                // sql_print_information
#include "mysqld_thd_manager.h"                 // Global_THD_manager
#include "rpl_binlog_sender.h"                  // Binlog_sender
#include "rpl_filter.h"                         // binlog_filter
#include "rpl_handler.h"                        // RUN_HOOK
#include "sql_class.h"                          // THD
#include "rpl_group_replication.h"              // is_group_replication_running
#include "mutex_lock.h"                         // Mutex_lock
#include "pfs_file_provider.h"
#include "mysql/psi/mysql_file.h"


int max_binlog_dump_events = 0; // unlimited
my_bool opt_sporadic_binlog_dump_fail = 0;

#define SLAVE_LIST_CHUNK 128
#define SLAVE_ERRMSG_SIZE (FN_REFLEN+64)
HASH slave_list;
extern TYPELIB binlog_checksum_typelib;


#define get_object(p, obj, msg) \
{\
  uint len; \
  if (p >= p_end) \
  { \
    my_error(ER_MALFORMED_PACKET, MYF(0)); \
    my_free(si); \
    return 1; \
  } \
  len= (uint)*p++;  \
  if (p + len > p_end || len >= sizeof(obj)) \
  {\
    errmsg= msg;\
    goto err; \
  }\
  strmake(obj,(char*) p,len); \
  p+= len; \
}\

extern "C" uint32
*slave_list_key(SLAVE_INFO* si, size_t *len,
		my_bool not_used MY_ATTRIBUTE((unused)))
{
  *len = 4;
  return &si->server_id;
}

extern "C" void slave_info_free(void *s)
{
  my_free(s);
}

#ifdef HAVE_PSI_INTERFACE
static PSI_mutex_key key_LOCK_slave_list;

static PSI_mutex_info all_slave_list_mutexes[]=
{
  { &key_LOCK_slave_list, "LOCK_slave_list", PSI_FLAG_GLOBAL}
};

static void init_all_slave_list_mutexes(void)
{
  int count;

  count= array_elements(all_slave_list_mutexes);
  mysql_mutex_register("sql", all_slave_list_mutexes, count);
}
#endif /* HAVE_PSI_INTERFACE */

void init_slave_list()
{
#ifdef HAVE_PSI_INTERFACE
  init_all_slave_list_mutexes();
#endif

  my_hash_init(&slave_list, system_charset_info, SLAVE_LIST_CHUNK, 0, 0,
               (my_hash_get_key) slave_list_key,
               (my_hash_free_key) slave_info_free, 0,
               key_memory_SLAVE_INFO);
  mysql_mutex_init(key_LOCK_slave_list, &LOCK_slave_list, MY_MUTEX_INIT_FAST);
}

void end_slave_list()
{
  /* No protection by a mutex needed as we are only called at shutdown */
  if (my_hash_inited(&slave_list))
  {
    my_hash_free(&slave_list);
    mysql_mutex_destroy(&LOCK_slave_list);
  }
}

/**
  Register slave in 'slave_list' hash table.

  @return
    0	ok
  @return
    1	Error.   Error message sent to client
*/

int register_slave(THD* thd, uchar* packet, size_t packet_length)
{
  int res;
  SLAVE_INFO *si;
  uchar *p= packet, *p_end= packet + packet_length;
  const char *errmsg= "Wrong parameters to function register_slave";

  if (check_access(thd, REPL_SLAVE_ACL, any_db, NULL, NULL, 0, 0))
    return 1;
  if (!(si = (SLAVE_INFO*)my_malloc(key_memory_SLAVE_INFO,
                                    sizeof(SLAVE_INFO), MYF(MY_WME))))
    goto err2;

  /* 4 bytes for the server id */
  if (p + 4 > p_end)
  {
    my_error(ER_MALFORMED_PACKET, MYF(0));
    my_free(si);
    return 1;
  }

  thd->server_id= si->server_id= uint4korr(p);
  p+= 4;
  get_object(p,si->host, "Failed to register slave: too long 'report-host'");
  get_object(p,si->user, "Failed to register slave: too long 'report-user'");
  get_object(p,si->password, "Failed to register slave; too long 'report-password'");
  if (p+10 > p_end)
    goto err;
  si->port= uint2korr(p);
  p += 2;
  /*
     We need to by pass the bytes used in the fake rpl_recovery_rank
     variable. It was removed in patch for BUG#13963. But this would
     make a server with that patch unable to connect to an old master.
     See: BUG#49259
  */
  p += 4;
  if (!(si->master_id= uint4korr(p)))
    si->master_id= server_id;
  si->thd= thd;

  mysql_mutex_lock(&LOCK_slave_list);
  unregister_slave(thd, false, false/*need_lock_slave_list=false*/);
  res= my_hash_insert(&slave_list, (uchar*) si);
  mysql_mutex_unlock(&LOCK_slave_list);
  return res;

err:
  my_free(si);
  my_message(ER_UNKNOWN_ERROR, errmsg, MYF(0)); /* purecov: inspected */
err2:
  return 1;
}

void unregister_slave(THD* thd, bool only_mine, bool need_lock_slave_list)
{
  if (thd->server_id && my_hash_inited(&slave_list))
  {
    if (need_lock_slave_list)
      mysql_mutex_lock(&LOCK_slave_list);
    else
      mysql_mutex_assert_owner(&LOCK_slave_list);

    SLAVE_INFO* old_si;
    if ((old_si = (SLAVE_INFO*)my_hash_search(&slave_list,
                                              (uchar*)&thd->server_id, 4)) &&
	(!only_mine || old_si->thd == thd))
    my_hash_delete(&slave_list, (uchar*)old_si);

    if (need_lock_slave_list)
      mysql_mutex_unlock(&LOCK_slave_list);
  }
}


/**
  Execute a SHOW SLAVE HOSTS statement.

  @param thd Pointer to THD object for the client thread executing the
  statement.

  @retval FALSE success
  @retval TRUE failure
*/
bool show_slave_hosts(THD* thd)
{
  List<Item> field_list;
  Protocol *protocol= thd->get_protocol();
  DBUG_ENTER("show_slave_hosts");

  field_list.push_back(new Item_return_int("Server_id", 10,
					   MYSQL_TYPE_LONG));
  field_list.push_back(new Item_empty_string("Host", 20));
  if (opt_show_slave_auth_info)
  {
    field_list.push_back(new Item_empty_string("User",20));
    field_list.push_back(new Item_empty_string("Password",20));
  }
  field_list.push_back(new Item_return_int("Port", 7, MYSQL_TYPE_LONG));
  field_list.push_back(new Item_return_int("Master_id", 10,
					   MYSQL_TYPE_LONG));
  field_list.push_back(new Item_empty_string("Slave_UUID", UUID_LENGTH));

  if (thd->send_result_metadata(&field_list,
                                Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
    DBUG_RETURN(TRUE);

  mysql_mutex_lock(&LOCK_slave_list);

  for (uint i = 0; i < slave_list.records; ++i)
  {
    SLAVE_INFO* si = (SLAVE_INFO*) my_hash_element(&slave_list, i);
    protocol->start_row();
    protocol->store((uint32) si->server_id);
    protocol->store(si->host, &my_charset_bin);
    if (opt_show_slave_auth_info)
    {
      protocol->store(si->user, &my_charset_bin);
      protocol->store(si->password, &my_charset_bin);
    }
    protocol->store((uint32) si->port);
    protocol->store((uint32) si->master_id);

    /* get slave's UUID */
    String slave_uuid;
    if (get_slave_uuid(si->thd, &slave_uuid))
      protocol->store(slave_uuid.c_ptr_safe(), &my_charset_bin);
    if (protocol->end_row())
    {
      mysql_mutex_unlock(&LOCK_slave_list);
      DBUG_RETURN(TRUE);
    }
  }
  mysql_mutex_unlock(&LOCK_slave_list);
  my_eof(thd);
  DBUG_RETURN(FALSE);
}

/**
  If there are less than BYTES bytes left to read in the packet,
  report error.
*/
#define CHECK_PACKET_SIZE(BYTES)                                        \
  do {                                                                  \
    if (packet_bytes_todo < BYTES)                                      \
      goto error_malformed_packet;                                      \
  } while (0)

/**
  Auxiliary macro used to define READ_INT and READ_STRING.

  Check that there are at least BYTES more bytes to read, then read
  the bytes using the given DECODER, then advance the reading
  position.
*/
#define READ(DECODE, BYTES)                                             \
  do {                                                                  \
    CHECK_PACKET_SIZE(BYTES);                                           \
    DECODE;                                                             \
    packet_position+= BYTES;                                            \
    packet_bytes_todo-= BYTES;                                          \
  } while (0)


/**
  Check that there are at least BYTES more bytes to read, then read
  the bytes and decode them into the given integer VAR, then advance
  the reading position.
*/
#define READ_INT(VAR, BYTES)                                            \
  READ(VAR= uint ## BYTES ## korr(packet_position), BYTES)

/**
  Check that there are at least BYTES more bytes to read and that
  BYTES+1 is not greater than BUFFER_SIZE, then read the bytes into
  the given variable VAR, then advance the reading position.
*/
#define READ_STRING(VAR, BYTES, BUFFER_SIZE)                            \
  do {                                                                  \
    if (BUFFER_SIZE <= BYTES)                                           \
      goto error_malformed_packet;                                      \
    READ(memcpy(VAR, packet_position, BYTES), BYTES);                   \
    VAR[BYTES]= '\0';                                                   \
  } while (0)


bool com_binlog_dump(THD *thd, char *packet, size_t packet_length)
{
  DBUG_ENTER("com_binlog_dump");
  ulong pos;
  ushort flags= 0;
  const uchar* packet_position= (uchar *) packet;
  size_t packet_bytes_todo= packet_length;

  assert(!thd->status_var_aggregated);
  thd->status_var.com_other++;
  thd->enable_slow_log= opt_log_slow_admin_statements;
  if (check_global_access(thd, REPL_SLAVE_ACL))
    DBUG_RETURN(false);

  /*
    4 bytes is too little, but changing the protocol would break
    compatibility.  This has been fixed in the new protocol. @see
    com_binlog_dump_gtid().
  */
  READ_INT(pos, 4);
  READ_INT(flags, 2);
  READ_INT(thd->server_id, 4);

  DBUG_PRINT("info", ("pos=%lu flags=%d server_id=%d", pos, flags, thd->server_id));

  kill_zombie_dump_threads(thd);

  query_logger.general_log_print(thd, thd->get_command(), "Log: '%s'  Pos: %ld",
                                 packet + 10, (long) pos);
  mysql_binlog_send(thd, thd->mem_strdup(packet + 10), (my_off_t) pos, NULL, flags);

  unregister_slave(thd, true, true/*need_lock_slave_list=true*/);
  /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
  DBUG_RETURN(true);

error_malformed_packet:
  my_error(ER_MALFORMED_PACKET, MYF(0));
  DBUG_RETURN(true);
}


bool com_binlog_dump_gtid(THD *thd, char *packet, size_t packet_length)
{
  DBUG_ENTER("com_binlog_dump_gtid");
  /*
    Before going GA, we need to make this protocol extensible without
    breaking compatitibilty. /Alfranio.
  */
  ushort flags= 0;
  uint32 data_size= 0;
  uint64 pos= 0;
  char name[FN_REFLEN + 1];
  uint32 name_size= 0;
  char* gtid_string= NULL;
  const uchar* packet_position= (uchar *) packet;
  size_t packet_bytes_todo= packet_length;
  Sid_map sid_map(NULL/*no sid_lock because this is a completely local object*/);
  Gtid_set slave_gtid_executed(&sid_map);

  assert(!thd->status_var_aggregated);
  thd->status_var.com_other++;
  thd->enable_slow_log= opt_log_slow_admin_statements;
  if (check_global_access(thd, REPL_SLAVE_ACL))
    DBUG_RETURN(false);

  READ_INT(flags,2);
  READ_INT(thd->server_id, 4);
  READ_INT(name_size, 4);
  READ_STRING(name, name_size, sizeof(name));
  READ_INT(pos, 8);
  DBUG_PRINT("info", ("pos=%llu flags=%d server_id=%d", pos, flags, thd->server_id));
  READ_INT(data_size, 4);
  CHECK_PACKET_SIZE(data_size);
  if (slave_gtid_executed.add_gtid_encoding(packet_position, data_size) !=
      RETURN_STATUS_OK)
    DBUG_RETURN(true);
  slave_gtid_executed.to_string(&gtid_string);
  DBUG_PRINT("info", ("Slave %d requested to read %s at position %llu gtid set "
                      "'%s'.", thd->server_id, name, pos, gtid_string));

  kill_zombie_dump_threads(thd);
  query_logger.general_log_print(thd, thd->get_command(),
                                 "Log: '%s' Pos: %llu GTIDs: '%s'",
                                 name, pos, gtid_string);
  my_free(gtid_string);
  mysql_binlog_send(thd, name, (my_off_t) pos, &slave_gtid_executed, flags);

  unregister_slave(thd, true, true/*need_lock_slave_list=true*/);
  /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
  DBUG_RETURN(true);

error_malformed_packet:
  my_error(ER_MALFORMED_PACKET, MYF(0));
  DBUG_RETURN(true);
}

void mysql_binlog_send(THD* thd, char* log_ident, my_off_t pos,
                       Gtid_set* slave_gtid_executed, uint32 flags)
{
  Binlog_sender sender(thd, log_ident, pos, slave_gtid_executed, flags);

  sender.run();
}

/**
  An auxiliary function extracts slave UUID.

  @param[in]    thd  THD to access a user variable
  @param[out]   value String to return UUID value.

  @return       if success value is returned else NULL is returned.
*/
String *get_slave_uuid(THD *thd, String *value)
{
  uchar name[]= "slave_uuid";

  if (value == NULL)
    return NULL;

  /* Protects thd->user_vars. */
  Mutex_lock lock_guard(&thd->LOCK_thd_data);

  user_var_entry *entry=
    (user_var_entry*) my_hash_search(&thd->user_vars, name, sizeof(name)-1);
  if (entry && entry->length() > 0)
  {
    value->copy(entry->ptr(), entry->length(), NULL);
    return value;
  }
  return NULL;
}

/**
  Callback function used by kill_zombie_dump_threads() function to
  to find zombie dump thread from the thd list.

  @note It acquires LOCK_thd_data mutex when it finds matching thd.
  It is the responsibility of the caller to release this mutex.
*/
class Find_zombie_dump_thread : public Find_THD_Impl
{
public:
  Find_zombie_dump_thread(String value): m_slave_uuid(value) {}
  virtual bool operator()(THD *thd)
  {
    THD *cur_thd= current_thd;
    if (thd != cur_thd && (thd->get_command() == COM_BINLOG_DUMP ||
                               thd->get_command() == COM_BINLOG_DUMP_GTID))
    {
      String tmp_uuid;
      bool is_zombie_thread= false;
      get_slave_uuid(thd, &tmp_uuid);
      if (m_slave_uuid.length())
      {
        is_zombie_thread= (tmp_uuid.length() &&
                           !strncmp(m_slave_uuid.c_ptr(),
                                    tmp_uuid.c_ptr(), UUID_LENGTH));
      }
      else
      {
        /*
          Check if it is a 5.5 slave's dump thread i.e., server_id should be
          same && dump thread should not contain 'UUID'.
        */
        is_zombie_thread= ((thd->server_id == cur_thd->server_id) &&
                           !tmp_uuid.length());
      }
      if (is_zombie_thread)
      {
        mysql_mutex_lock(&thd->LOCK_thd_data);
        return true;
      }
    }
    return false;
  }
private:
  String m_slave_uuid;
};

/*

  Kill all Binlog_dump threads which previously talked to the same slave
  ("same" means with the same UUID(for slave versions >= 5.6) or same server id
  (for slave versions < 5.6). Indeed, if the slave stops, if the
  Binlog_dump thread is waiting (mysql_cond_wait) for binlog update, then it
  will keep existing until a query is written to the binlog. If the master is
  idle, then this could last long, and if the slave reconnects, we could have 2
  Binlog_dump threads in SHOW PROCESSLIST, until a query is written to the
  binlog. To avoid this, when the slave reconnects and sends COM_BINLOG_DUMP,
  the master kills any existing thread with the slave's UUID/server id (if this id is
  not zero; it will be true for real slaves, but false for mysqlbinlog when it
  sends COM_BINLOG_DUMP to get a remote binlog dump).

  SYNOPSIS
    kill_zombie_dump_threads()
    @param thd newly connected dump thread object

*/

void kill_zombie_dump_threads(THD *thd)
{
  String slave_uuid;
  get_slave_uuid(thd, &slave_uuid);
  if (slave_uuid.length() == 0 && thd->server_id == 0)
    return;

  Find_zombie_dump_thread find_zombie_dump_thread(slave_uuid);
  THD *tmp= Global_THD_manager::get_instance()->
                                find_thd(&find_zombie_dump_thread);
  if (tmp)
  {
    /*
      Here we do not call kill_one_thread() as
      it will be slow because it will iterate through the list
      again. We just to do kill the thread ourselves.
    */
    if (log_warnings > 1)
    {
      if (slave_uuid.length())
      {
        sql_print_information("While initializing dump thread for slave with "
                              "UUID <%s>, found a zombie dump thread with the "
                              "same UUID. Master is killing the zombie dump "
                              "thread(%u).", slave_uuid.c_ptr(),
                              tmp->thread_id());
      }
      else
      {
        sql_print_information("While initializing dump thread for slave with "
                              "server_id <%u>, found a zombie dump thread with the "
                              "same server_id. Master is killing the zombie dump "
                              "thread(%u).", thd->server_id,
                              tmp->thread_id());
      }
    }
    tmp->duplicate_slave_id= true;
    tmp->awake(THD::KILL_QUERY);
    mysql_mutex_unlock(&tmp->LOCK_thd_data);
  }
}

/**
  Execute a RESET MASTER statement.

  @param thd Pointer to THD object of the client thread executing the
  statement.

  @retval false success
  @retval true error
*/
bool reset_master(THD* thd)
{
  bool ret= false;

  /*
    RESET MASTER command should ignore 'read-only' and 'super_read_only'
    options so that it can update 'mysql.gtid_executed' replication repository
    table.

    Please note that skip_readonly_check flag should be set even when binary log
    is not enabled, as RESET MASTER command will clear 'gtid_executed' table.
  */
  thd->set_skip_readonly_check();
  if (is_group_replication_running())
  {
    my_error(ER_CANT_RESET_MASTER, MYF(0), "Group Replication is running");
    return true;
  }

  if (mysql_bin_log.is_open())
  {
    /*
      mysql_bin_log.reset_logs will delete the binary logs *and* clear
      gtid_state.  It is important to do both these operations from
      within reset_logs, since the operations can then use the same
      lock.  I.e., if we would remove the call to gtid_state->clear
      from reset_logs and call gtid_state->clear explicitly from this
      function instead, it would be possible for a concurrent thread
      to commit between the point where the binary log was removed and
      the point where the gtid_executed table is cleared. This would
      lead to an inconsistent state.
    */
    ret= mysql_bin_log.reset_logs(thd);
  }
  else
  {
    global_sid_lock->wrlock();
    ret= (gtid_state->clear(thd) != 0);
    global_sid_lock->unlock();
  }

  /*
    Only run after_reset_master hook, when all reset operations preceding this
    have succeeded.
  */
  if (!ret)
    (void) RUN_HOOK(binlog_transmit, after_reset_master, (thd, 0 /* flags */));
  return ret;
 }


/**
  Execute a SHOW MASTER STATUS statement.

  @param thd Pointer to THD object for the client thread executing the
  statement.

  @retval false success
  @retval true failure
*/
bool show_master_status(THD* thd)
{
  Protocol *protocol= thd->get_protocol();
  char* gtid_set_buffer= NULL;
  int gtid_set_size= 0;
  List<Item> field_list;

  DBUG_ENTER("show_binlog_info");

  global_sid_lock->wrlock();
  const Gtid_set* gtid_set= gtid_state->get_executed_gtids();
  if ((gtid_set_size= gtid_set->to_string(&gtid_set_buffer)) < 0)
  {
    global_sid_lock->unlock();
    my_eof(thd);
    my_free(gtid_set_buffer);
    DBUG_RETURN(true);
  }
  global_sid_lock->unlock();

  field_list.push_back(new Item_empty_string("File", FN_REFLEN));
  field_list.push_back(new Item_return_int("Position",20,
					   MYSQL_TYPE_LONGLONG));
  field_list.push_back(new Item_empty_string("Binlog_Do_DB",255));
  field_list.push_back(new Item_empty_string("Binlog_Ignore_DB",255));
  field_list.push_back(new Item_empty_string("Executed_Gtid_Set",
                                             gtid_set_size));

  if (thd->send_result_metadata(&field_list,
                                Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
  {
    my_free(gtid_set_buffer);
    DBUG_RETURN(true);
  }
  protocol->start_row();

  if (mysql_bin_log.is_open())
  {
    LOG_INFO li;
    mysql_bin_log.get_current_log(&li);
    size_t dir_len = dirname_length(li.log_file_name);
    protocol->store(li.log_file_name + dir_len, &my_charset_bin);
    protocol->store((ulonglong) li.pos);
    store(protocol, binlog_filter->get_do_db());
    store(protocol, binlog_filter->get_ignore_db());
    protocol->store(gtid_set_buffer, &my_charset_bin);
    if (protocol->end_row())
    {
      my_free(gtid_set_buffer);
      DBUG_RETURN(true);
    }
  }
  my_eof(thd);
  my_free(gtid_set_buffer);
  DBUG_RETURN(false);
}


/**
  Execute a SHOW BINARY LOGS statement.

  @param thd Pointer to THD object for the client thread executing the
  statement.

  @retval FALSE success
  @retval TRUE failure
*/
bool show_binlogs(THD* thd)
{
  IO_CACHE *index_file;
  LOG_INFO cur;
  File file;
  char fname[FN_REFLEN];
  List<Item> field_list;
  size_t length;
  size_t cur_dir_len;
  Protocol *protocol= thd->get_protocol();
  DBUG_ENTER("show_binlogs");

  if (!mysql_bin_log.is_open())
  {
    my_error(ER_NO_BINARY_LOGGING, MYF(0));
    DBUG_RETURN(TRUE);
  }

  field_list.push_back(new Item_empty_string("Log_name", 255));
  field_list.push_back(new Item_return_int("File_size", 20,
                                           MYSQL_TYPE_LONGLONG));
    if (thd->send_result_metadata(&field_list, Protocol::SEND_NUM_ROWS |
                                    Protocol::SEND_EOF))
    DBUG_RETURN(TRUE);

  mysql_mutex_lock(mysql_bin_log.get_log_lock());
  DEBUG_SYNC(thd, "show_binlogs_after_lock_log_before_lock_index");
  mysql_bin_log.lock_index();
  index_file=mysql_bin_log.get_index_file();

  mysql_bin_log.raw_get_current_log(&cur); // dont take mutex
  mysql_mutex_unlock(mysql_bin_log.get_log_lock()); // lockdep, OK

  cur_dir_len= dirname_length(cur.log_file_name);

  if (reinit_io_cache(index_file, READ_CACHE, (my_off_t)0, 0, 0))
    goto err;

  /* The file ends with EOF or empty line */
  while ((length=my_b_gets(index_file, fname, sizeof(fname))) > 1)
  {
    size_t dir_len;
    ulonglong file_length= 0;                   // Length if open fails
    fname[--length] = '\0';                     // remove the newline

    protocol->start_row();
    dir_len= dirname_length(fname);
    length-= dir_len;
    protocol->store(fname + dir_len, length, &my_charset_bin);

    if (!(strncmp(fname+dir_len, cur.log_file_name+cur_dir_len, length)))
      file_length= cur.pos;  /* The active log, use the active position */
    else
    {
      /* this is an old log, open it and find the size */
      if ((file= mysql_file_open(key_file_binlog,
                                 fname, O_RDONLY | O_SHARE | O_BINARY,
                                 MYF(0))) >= 0)
      {
        file_length= (ulonglong) mysql_file_seek(file, 0L, MY_SEEK_END, MYF(0));
        mysql_file_close(file, MYF(0));
      }
    }
    protocol->store(file_length);
    if (protocol->end_row())
    {
      DBUG_PRINT("info", ("stopping dump thread because protocol->write failed at line %d", __LINE__));
      goto err;
    }
  }
  if(index_file->error == -1)
    goto err;
  mysql_bin_log.unlock_index();
  my_eof(thd);
  DBUG_RETURN(FALSE);

err:
  mysql_bin_log.unlock_index();
  DBUG_RETURN(TRUE);
}

#endif /* HAVE_REPLICATION */