mirror of
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318000cffc
Add "real ip:<ip_or_localhost>" part to the aborted message Only for proxy-protocoled connection, so it does not not to cause confusion to normal users.
1504 lines
42 KiB
C++
1504 lines
42 KiB
C++
/* Copyright (c) 2000, 2016, Oracle and/or its affiliates.
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Copyright (c) 2012, 2022, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
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/**
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@file
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This file is the net layer API for the MySQL client/server protocol.
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Write and read of logical packets to/from socket.
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Writes are cached into net_buffer_length big packets.
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Read packets are reallocated dynamicly when reading big packets.
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Each logical packet has the following pre-info:
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3 byte length & 1 byte package-number.
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This file needs to be written in C as it's used by the libmysql client as a
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C file.
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*/
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/*
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HFTODO this must be hidden if we don't want client capabilities in
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embedded library
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*/
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#include "mariadb.h"
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#include <mysql.h>
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#include <mysql_com.h>
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#include <mysqld_error.h>
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#include <my_sys.h>
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#include <m_string.h>
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#include <my_net.h>
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#include <violite.h>
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#include <signal.h>
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#include "probes_mysql.h"
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#include <debug_sync.h>
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#include "proxy_protocol.h"
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PSI_memory_key key_memory_NET_buff;
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PSI_memory_key key_memory_NET_compress_packet;
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#ifdef EMBEDDED_LIBRARY
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#undef MYSQL_SERVER
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#undef MYSQL_CLIENT
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#define MYSQL_CLIENT
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#endif /*EMBEDDED_LIBRARY */
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/*
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to reduce the number of ifdef's in the code
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*/
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#ifdef EXTRA_DEBUG
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#define EXTRA_DEBUG_fprintf fprintf
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#define EXTRA_DEBUG_fflush fflush
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#define EXTRA_DEBUG_ASSERT DBUG_ASSERT
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#else
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static void inline EXTRA_DEBUG_fprintf(...) {}
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#ifndef MYSQL_SERVER
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static int inline EXTRA_DEBUG_fflush(...) { return 0; }
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#endif
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#endif /* EXTRA_DEBUG */
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#ifdef MYSQL_SERVER
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#include <sql_class.h>
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#include <sql_connect.h>
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static void inline MYSQL_SERVER_my_error(uint error, myf flags)
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{
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my_error(error,
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flags | MYF(global_system_variables.log_warnings > 3 ? ME_ERROR_LOG : 0));
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}
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#else
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static void inline MYSQL_SERVER_my_error(...) {}
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#endif
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#ifndef EXTRA_DEBUG_ASSERT
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# define EXTRA_DEBUG_ASSERT(X) do {} while(0)
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#endif
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/*
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The following handles the differences when this is linked between the
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client and the server.
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This gives an error if a too big packet is found.
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The server can change this, but because the client can't normally do this
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the client should have a bigger max_allowed_packet.
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*/
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#if defined(_WIN32) || !defined(MYSQL_SERVER)
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/* The following is because alarms doesn't work on windows. */
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#ifndef NO_ALARM
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#define NO_ALARM
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#endif
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#endif
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#ifndef NO_ALARM
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#include "my_pthread.h"
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void sql_print_error(const char *format,...);
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#else
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#define DONT_USE_THR_ALARM
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#endif /* NO_ALARM */
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#include "thr_alarm.h"
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#ifdef MYSQL_SERVER
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/*
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The following variables/functions should really not be declared
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extern, but as it's hard to include sql_priv.h here, we have to
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live with this for a while.
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*/
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extern ulonglong test_flags;
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extern ulong bytes_sent, bytes_received, net_big_packet_count;
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#ifdef HAVE_QUERY_CACHE
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#define USE_QUERY_CACHE
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extern void query_cache_insert(void *thd, const char *packet, size_t length,
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unsigned pkt_nr);
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#endif // HAVE_QUERY_CACHE
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#define update_statistics(A) A
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extern my_bool thd_net_is_killed(THD *thd);
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/* Additional instrumentation hooks for the server */
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#include "mysql_com_server.h"
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#else
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#define update_statistics(A)
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#define thd_net_is_killed(A) 0
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#endif
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static my_bool net_write_buff(NET *, const uchar *, size_t len);
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my_bool net_allocate_new_packet(NET *net, void *thd, uint my_flags);
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/** Init with packet info. */
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my_bool my_net_init(NET *net, Vio *vio, void *thd, uint my_flags)
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{
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DBUG_ENTER("my_net_init");
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DBUG_PRINT("enter", ("my_flags: %u", my_flags));
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net->vio = vio;
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net->read_timeout= 0;
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net->write_timeout= 0;
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my_net_local_init(net); /* Set some limits */
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if (net_allocate_new_packet(net, thd, my_flags))
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DBUG_RETURN(1);
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net->error=0; net->return_status=0;
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net->pkt_nr=net->compress_pkt_nr=0;
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net->last_error[0]=0;
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net->compress=0; net->reading_or_writing=0;
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net->where_b = net->remain_in_buf=0;
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net->net_skip_rest_factor= 0;
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net->last_errno=0;
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net->pkt_nr_can_be_reset= 0;
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net->using_proxy_protocol= 0;
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net->thread_specific_malloc= MY_TEST(my_flags & MY_THREAD_SPECIFIC);
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net->thd= 0;
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#ifdef MYSQL_SERVER
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net->extension= NULL;
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net->thd= thd;
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#endif
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if (vio)
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{
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/* For perl DBI/DBD. */
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net->fd= vio_fd(vio);
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#if defined(MYSQL_SERVER) && !defined(_WIN32)
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if (!(test_flags & TEST_BLOCKING))
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{
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my_bool old_mode;
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vio_blocking(vio, FALSE, &old_mode);
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}
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#endif
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vio_fastsend(vio);
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}
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DBUG_RETURN(0);
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}
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/**
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Allocate and assign new net buffer
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@note In case of error the old buffer left
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@retval TRUE error
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@retval FALSE success
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*/
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my_bool net_allocate_new_packet(NET *net, void *thd, uint my_flags)
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{
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uchar *tmp;
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DBUG_ENTER("net_allocate_new_packet");
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if (!(tmp= (uchar*) my_malloc(key_memory_NET_buff,
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(size_t) net->max_packet +
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NET_HEADER_SIZE + COMP_HEADER_SIZE + 1,
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MYF(MY_WME | my_flags))))
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DBUG_RETURN(1);
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net->buff= tmp;
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net->buff_end=net->buff+net->max_packet;
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net->write_pos=net->read_pos = net->buff;
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DBUG_RETURN(0);
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}
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void net_end(NET *net)
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{
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DBUG_ENTER("net_end");
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my_free(net->buff);
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net->buff=0;
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net->using_proxy_protocol= 0;
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DBUG_VOID_RETURN;
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}
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/** Realloc the packet buffer. */
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my_bool net_realloc(NET *net, size_t length)
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{
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uchar *buff;
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size_t pkt_length;
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DBUG_ENTER("net_realloc");
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DBUG_PRINT("enter",("length: %lu", (ulong) length));
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if (length >= net->max_packet_size)
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{
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DBUG_PRINT("error", ("Packet too large. Max size: %lu",
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net->max_packet_size));
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/* @todo: 1 and 2 codes are identical. */
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net->error= 1;
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net->last_errno= ER_NET_PACKET_TOO_LARGE;
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MYSQL_SERVER_my_error(ER_NET_PACKET_TOO_LARGE, MYF(0));
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DBUG_RETURN(1);
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}
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pkt_length = (length+IO_SIZE-1) & ~(IO_SIZE-1);
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/*
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We must allocate some extra bytes for the end 0 and to be able to
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read big compressed blocks + 1 safety byte since uint3korr() in
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my_real_read() may actually read 4 bytes depending on build flags and
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platform.
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*/
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if (!(buff= (uchar*) my_realloc(key_memory_NET_buff,
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(char*) net->buff, pkt_length +
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NET_HEADER_SIZE + COMP_HEADER_SIZE + 1,
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MYF(MY_WME | (net->thread_specific_malloc
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? MY_THREAD_SPECIFIC : 0)))))
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{
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/* @todo: 1 and 2 codes are identical. */
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net->error= 1;
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net->last_errno= ER_OUT_OF_RESOURCES;
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/* In the server the error is reported by MY_WME flag. */
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DBUG_RETURN(1);
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}
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net->buff=net->write_pos=buff;
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net->buff_end=buff+(net->max_packet= (ulong) pkt_length);
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DBUG_RETURN(0);
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}
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/**
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Check if there is any data to be read from the socket.
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@param sd socket descriptor
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@retval
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0 No data to read
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@retval
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1 Data or EOF to read
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@retval
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-1 Don't know if data is ready or not
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*/
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#if !defined(EMBEDDED_LIBRARY) && defined(DBUG_OFF)
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static int net_data_is_ready(my_socket sd)
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{
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#ifdef HAVE_POLL
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struct pollfd ufds;
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int res;
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ufds.fd= sd;
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ufds.events= POLLIN | POLLPRI;
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if (!(res= poll(&ufds, 1, 0)))
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return 0;
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if (res < 0 || !(ufds.revents & (POLLIN | POLLPRI)))
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return 0;
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return 1;
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#else
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fd_set sfds;
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struct timeval tv;
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int res;
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#ifndef _WIN32
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/* Windows uses an _array_ of 64 fd's as default, so it's safe */
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if (sd >= FD_SETSIZE)
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return -1;
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#define NET_DATA_IS_READY_CAN_RETURN_MINUS_ONE
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#endif
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FD_ZERO(&sfds);
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FD_SET(sd, &sfds);
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tv.tv_sec= tv.tv_usec= 0;
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if ((res= select((int) (sd + 1), &sfds, NULL, NULL, &tv)) < 0)
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return 0;
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else
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return MY_TEST(res ? FD_ISSET(sd, &sfds) : 0);
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#endif /* HAVE_POLL */
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}
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#endif /* EMBEDDED_LIBRARY */
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/**
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Clear (reinitialize) the NET structure for a new command.
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@remark Performs debug checking of the socket buffer to
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ensure that the protocol sequence is correct.
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- Read from socket until there is nothing more to read. Discard
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what is read.
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- Initialize net for new net_read/net_write calls.
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If there is anything when to read 'net_clear' is called this
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normally indicates an error in the protocol. Normally one should not
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need to do clear the communication buffer. If one compiles without
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-DUSE_NET_CLEAR then one wins one read call / query.
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When connection is properly closed (for TCP it means with
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a FIN packet), then select() considers a socket "ready to read",
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in the sense that there's EOF to read, but read() returns 0.
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@param net NET handler
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@param clear_buffer if <> 0, then clear all data from comm buff
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*/
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void net_clear(NET *net, my_bool clear_buffer __attribute__((unused)))
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{
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DBUG_ENTER("net_clear");
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/*
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We don't do a clear in case of not DBUG_OFF to catch bugs in the
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protocol handling.
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*/
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#if (!defined(EMBEDDED_LIBRARY) && defined(DBUG_OFF)) || defined(USE_NET_CLEAR)
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if (clear_buffer)
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{
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size_t count;
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int ready;
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while ((ready= net_data_is_ready(vio_fd(net->vio))) > 0)
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{
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/* The socket is ready */
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if ((long) (count= vio_read(net->vio, net->buff,
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(size_t) net->max_packet)) > 0)
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{
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DBUG_PRINT("info",("skipped %ld bytes from file: %s",
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(long) count, vio_description(net->vio)));
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EXTRA_DEBUG_fprintf(stderr,"Note: net_clear() skipped %ld bytes from file: %s\n",
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(long) count, vio_description(net->vio));
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}
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else
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{
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DBUG_PRINT("info",("socket ready but only EOF to read - disconnected"));
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net->error= 2;
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break;
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}
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}
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#ifdef NET_DATA_IS_READY_CAN_RETURN_MINUS_ONE
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/* 'net_data_is_ready' returned "don't know" */
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if (ready == -1)
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{
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/* Read unblocking to clear net */
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my_bool old_mode;
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if (!vio_blocking(net->vio, FALSE, &old_mode))
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{
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while ((long) (count= vio_read(net->vio, net->buff,
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(size_t) net->max_packet)) > 0)
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DBUG_PRINT("info",("skipped %ld bytes from file: %s",
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(long) count, vio_description(net->vio)));
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vio_blocking(net->vio, TRUE, &old_mode);
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}
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}
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#endif /* NET_DATA_IS_READY_CAN_RETURN_MINUS_ONE */
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}
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#endif /* EMBEDDED_LIBRARY */
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net->pkt_nr=net->compress_pkt_nr=0; /* Ready for new command */
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net->write_pos=net->buff;
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DBUG_VOID_RETURN;
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}
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/** Flush write_buffer if not empty. */
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my_bool net_flush(NET *net)
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{
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my_bool error= 0;
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DBUG_ENTER("net_flush");
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if (net->buff != net->write_pos)
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{
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error= MY_TEST(net_real_write(net, net->buff,
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(size_t) (net->write_pos - net->buff)));
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net->write_pos= net->buff;
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}
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/* Sync packet number if using compression */
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if (net->compress)
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net->pkt_nr=net->compress_pkt_nr;
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DBUG_RETURN(error);
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}
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/*****************************************************************************
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** Write something to server/client buffer
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*****************************************************************************/
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/**
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Write a logical packet with packet header.
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Format: Packet length (3 bytes), packet number (1 byte)
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When compression is used, a 3 byte compression length is added.
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@note If compression is used, the original packet is modified!
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*/
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my_bool my_net_write(NET *net, const uchar *packet, size_t len)
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{
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uchar buff[NET_HEADER_SIZE];
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if (unlikely(!net->vio)) /* nowhere to write */
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return 0;
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MYSQL_NET_WRITE_START(len);
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/*
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Big packets are handled by splitting them in packets of MAX_PACKET_LENGTH
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length. The last packet is always a packet that is < MAX_PACKET_LENGTH.
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(The last packet may even have a length of 0)
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*/
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while (len >= MAX_PACKET_LENGTH)
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{
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const ulong z_size = MAX_PACKET_LENGTH;
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int3store(buff, z_size);
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buff[3]= (uchar) net->pkt_nr++;
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if (net_write_buff(net, buff, NET_HEADER_SIZE) ||
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net_write_buff(net, packet, z_size))
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{
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MYSQL_NET_WRITE_DONE(1);
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return 1;
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}
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packet += z_size;
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len-= z_size;
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}
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/* Write last packet */
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int3store(buff,len);
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buff[3]= (uchar) net->pkt_nr++;
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if (net_write_buff(net, buff, NET_HEADER_SIZE))
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{
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MYSQL_NET_WRITE_DONE(1);
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return 1;
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}
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#ifndef DEBUG_DATA_PACKETS
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DBUG_DUMP("packet_header", buff, NET_HEADER_SIZE);
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#endif
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my_bool rc= MY_TEST(net_write_buff(net, packet, len));
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MYSQL_NET_WRITE_DONE(rc);
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return rc;
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}
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|
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/**
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Send a command to the server.
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The reason for having both header and packet is so that libmysql
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can easy add a header to a special command (like prepared statements)
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without having to re-alloc the string.
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As the command is part of the first data packet, we have to do some data
|
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juggling to put the command in there, without having to create a new
|
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packet.
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This function will split big packets into sub-packets if needed.
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(Each sub packet can only be 2^24 bytes)
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@param net NET handler
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@param command Command in MySQL server (enum enum_server_command)
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@param header Header to write after command
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@param head_len Length of header
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@param packet Query or parameter to query
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@param len Length of packet
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@retval
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0 ok
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@retval
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1 error
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*/
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my_bool
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net_write_command(NET *net,uchar command,
|
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const uchar *header, size_t head_len,
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const uchar *packet, size_t len)
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|
{
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size_t length=len+1+head_len; /* 1 extra byte for command */
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uchar buff[NET_HEADER_SIZE+1];
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uint header_size=NET_HEADER_SIZE+1;
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my_bool rc;
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DBUG_ENTER("net_write_command");
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DBUG_PRINT("enter",("length: %lu", (ulong) len));
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|
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#ifdef ENABLED_DEBUG_SYNC
|
|
DBUG_EXECUTE_IF("simulate_error_on_packet_write",
|
|
{
|
|
if (command == COM_BINLOG_DUMP)
|
|
{
|
|
net->last_errno = ER_NET_ERROR_ON_WRITE;
|
|
DBUG_ASSERT(!debug_sync_set_action(
|
|
(THD *)net->thd,
|
|
STRING_WITH_LEN("now SIGNAL parked WAIT_FOR continue")));
|
|
DBUG_RETURN(true);
|
|
}
|
|
};);
|
|
#endif
|
|
MYSQL_NET_WRITE_START(length);
|
|
|
|
buff[4]=command; /* For first packet */
|
|
|
|
if (length >= MAX_PACKET_LENGTH)
|
|
{
|
|
/* Take into account that we have the command in the first header */
|
|
len= MAX_PACKET_LENGTH - 1 - head_len;
|
|
do
|
|
{
|
|
int3store(buff, MAX_PACKET_LENGTH);
|
|
buff[3]= (uchar) net->pkt_nr++;
|
|
if (net_write_buff(net, buff, header_size) ||
|
|
net_write_buff(net, header, head_len) ||
|
|
net_write_buff(net, packet, len))
|
|
{
|
|
MYSQL_NET_WRITE_DONE(1);
|
|
DBUG_RETURN(1);
|
|
}
|
|
packet+= len;
|
|
length-= MAX_PACKET_LENGTH;
|
|
len= MAX_PACKET_LENGTH;
|
|
head_len= 0;
|
|
header_size= NET_HEADER_SIZE;
|
|
} while (length >= MAX_PACKET_LENGTH);
|
|
len=length; /* Data left to be written */
|
|
}
|
|
int3store(buff,length);
|
|
buff[3]= (uchar) net->pkt_nr++;
|
|
rc= MY_TEST(net_write_buff(net, buff, header_size) ||
|
|
(head_len && net_write_buff(net, header, head_len)) ||
|
|
net_write_buff(net, packet, len) || net_flush(net));
|
|
MYSQL_NET_WRITE_DONE(rc);
|
|
DBUG_RETURN(rc);
|
|
}
|
|
|
|
/**
|
|
Caching the data in a local buffer before sending it.
|
|
|
|
Fill up net->buffer and send it to the client when full.
|
|
|
|
If the rest of the to-be-sent-packet is bigger than buffer,
|
|
send it in one big block (to avoid copying to internal buffer).
|
|
If not, copy the rest of the data to the buffer and return without
|
|
sending data.
|
|
|
|
@param net Network handler
|
|
@param packet Packet to send
|
|
@param len Length of packet
|
|
|
|
@note
|
|
The cached buffer can be sent as it is with 'net_flush()'.
|
|
In this code we have to be careful to not send a packet longer than
|
|
MAX_PACKET_LENGTH to net_real_write() if we are using the compressed
|
|
protocol as we store the length of the compressed packet in 3 bytes.
|
|
|
|
@retval
|
|
0 ok
|
|
@retval
|
|
1
|
|
*/
|
|
|
|
static my_bool
|
|
net_write_buff(NET *net, const uchar *packet, size_t len)
|
|
{
|
|
size_t left_length;
|
|
if (net->compress && net->max_packet > MAX_PACKET_LENGTH)
|
|
left_length= (MAX_PACKET_LENGTH - (net->write_pos - net->buff));
|
|
else
|
|
left_length= (net->buff_end - net->write_pos);
|
|
|
|
#ifdef DEBUG_DATA_PACKETS
|
|
DBUG_DUMP("data_written", packet, len);
|
|
#endif
|
|
if (len > left_length)
|
|
{
|
|
if (net->write_pos != net->buff)
|
|
{
|
|
/* Fill up already used packet and write it */
|
|
memcpy((char*) net->write_pos,packet,left_length);
|
|
if (net_real_write(net, net->buff,
|
|
(size_t) (net->write_pos - net->buff) + left_length))
|
|
return 1;
|
|
net->write_pos= net->buff;
|
|
packet+= left_length;
|
|
len-= left_length;
|
|
}
|
|
if (net->compress)
|
|
{
|
|
/*
|
|
We can't have bigger packets than 16M with compression
|
|
Because the uncompressed length is stored in 3 bytes
|
|
*/
|
|
left_length= MAX_PACKET_LENGTH;
|
|
while (len > left_length)
|
|
{
|
|
if (net_real_write(net, packet, left_length))
|
|
return 1;
|
|
packet+= left_length;
|
|
len-= left_length;
|
|
}
|
|
}
|
|
if (len > net->max_packet)
|
|
return net_real_write(net, packet, len) ? 1 : 0;
|
|
/* Send out rest of the blocks as full sized blocks */
|
|
}
|
|
if (len)
|
|
memcpy((char*) net->write_pos,packet,len);
|
|
net->write_pos+= len;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
Read and write one packet using timeouts.
|
|
If needed, the packet is compressed before sending.
|
|
|
|
@todo
|
|
- TODO is it needed to set this variable if we have no socket
|
|
*/
|
|
|
|
int
|
|
net_real_write(NET *net,const uchar *packet, size_t len)
|
|
{
|
|
size_t length;
|
|
const uchar *pos,*end;
|
|
thr_alarm_t alarmed;
|
|
#ifndef NO_ALARM
|
|
ALARM alarm_buff;
|
|
#endif
|
|
uint retry_count=0;
|
|
my_bool net_blocking = vio_is_blocking(net->vio);
|
|
DBUG_ENTER("net_real_write");
|
|
|
|
#if defined(MYSQL_SERVER)
|
|
THD *thd= (THD *)net->thd;
|
|
#if defined(USE_QUERY_CACHE)
|
|
query_cache_insert(thd, (char*) packet, len, net->pkt_nr);
|
|
#endif
|
|
if (likely(thd))
|
|
{
|
|
/*
|
|
Wait until pending operations (currently it is engine
|
|
asynchronous group commit) are finished before replying
|
|
to the client, to keep durability promise.
|
|
*/
|
|
thd->async_state.wait_for_pending_ops();
|
|
}
|
|
#endif
|
|
|
|
if (unlikely(net->error == 2))
|
|
DBUG_RETURN(-1); /* socket can't be used */
|
|
|
|
net->reading_or_writing=2;
|
|
#ifdef HAVE_COMPRESS
|
|
if (net->compress)
|
|
{
|
|
size_t complen;
|
|
uchar *b;
|
|
uint header_length=NET_HEADER_SIZE+COMP_HEADER_SIZE;
|
|
if (!(b= (uchar*) my_malloc(key_memory_NET_compress_packet,
|
|
len + NET_HEADER_SIZE + COMP_HEADER_SIZE + 1,
|
|
MYF(MY_WME | (net->thread_specific_malloc
|
|
? MY_THREAD_SPECIFIC : 0)))))
|
|
{
|
|
net->error= 2;
|
|
net->last_errno= ER_OUT_OF_RESOURCES;
|
|
/* In the server, the error is reported by MY_WME flag. */
|
|
net->reading_or_writing= 0;
|
|
DBUG_RETURN(1);
|
|
}
|
|
memcpy(b+header_length,packet,len);
|
|
|
|
/* Don't compress error packets (compress == 2) */
|
|
if (net->compress == 2 || my_compress(b+header_length, &len, &complen))
|
|
complen=0;
|
|
int3store(&b[NET_HEADER_SIZE],complen);
|
|
int3store(b,len);
|
|
b[3]=(uchar) (net->compress_pkt_nr++);
|
|
len+= header_length;
|
|
packet= b;
|
|
}
|
|
#endif /* HAVE_COMPRESS */
|
|
|
|
#ifdef DEBUG_DATA_PACKETS
|
|
DBUG_DUMP("data_written", packet, len);
|
|
#endif
|
|
|
|
#ifndef NO_ALARM
|
|
thr_alarm_init(&alarmed);
|
|
if (net_blocking)
|
|
thr_alarm(&alarmed, net->write_timeout, &alarm_buff);
|
|
#else
|
|
alarmed=0;
|
|
/* Write timeout is set in my_net_set_write_timeout */
|
|
#endif /* NO_ALARM */
|
|
|
|
pos= packet;
|
|
end=pos+len;
|
|
while (pos != end)
|
|
{
|
|
if ((long) (length= vio_write(net->vio,pos,(size_t) (end-pos))) <= 0)
|
|
{
|
|
my_bool interrupted = vio_should_retry(net->vio);
|
|
#if !defined(_WIN32)
|
|
if ((interrupted || length == 0) && !thr_alarm_in_use(&alarmed))
|
|
{
|
|
if (!thr_alarm(&alarmed, net->write_timeout, &alarm_buff))
|
|
{ /* Always true for client */
|
|
my_bool old_mode;
|
|
while (vio_blocking(net->vio, TRUE, &old_mode) < 0)
|
|
{
|
|
if (vio_should_retry(net->vio) && retry_count++ < net->retry_count)
|
|
continue;
|
|
EXTRA_DEBUG_fprintf(stderr,
|
|
"%s: my_net_write: fcntl returned error %d, aborting thread\n",
|
|
my_progname,vio_errno(net->vio));
|
|
net->error= 2; /* Close socket */
|
|
net->last_errno= ER_NET_PACKET_TOO_LARGE;
|
|
MYSQL_SERVER_my_error(ER_NET_PACKET_TOO_LARGE, MYF(0));
|
|
goto end;
|
|
}
|
|
retry_count=0;
|
|
continue;
|
|
}
|
|
}
|
|
else
|
|
#endif /* !defined(_WIN32) */
|
|
if (thr_alarm_in_use(&alarmed) && !thr_got_alarm(&alarmed) &&
|
|
interrupted)
|
|
{
|
|
if (retry_count++ < net->retry_count)
|
|
continue;
|
|
EXTRA_DEBUG_fprintf(stderr, "%s: write looped, aborting thread\n",
|
|
my_progname);
|
|
}
|
|
#ifndef MYSQL_SERVER
|
|
if (vio_errno(net->vio) == SOCKET_EINTR)
|
|
{
|
|
DBUG_PRINT("warning",("Interrupted write. Retrying..."));
|
|
continue;
|
|
}
|
|
#endif /* !defined(MYSQL_SERVER) */
|
|
net->error= 2; /* Close socket */
|
|
net->last_errno= (interrupted ? ER_NET_WRITE_INTERRUPTED :
|
|
ER_NET_ERROR_ON_WRITE);
|
|
#ifdef MYSQL_SERVER
|
|
if (global_system_variables.log_warnings > 3)
|
|
{
|
|
my_printf_error(net->last_errno,
|
|
"Could not write packet: fd: %lld state: %d "
|
|
"errno: %d vio_errno: %d length: %ld",
|
|
MYF(ME_ERROR_LOG),
|
|
(longlong) vio_fd(net->vio), (int) net->vio->state,
|
|
vio_errno(net->vio), net->last_errno, (ulong) (end-pos));
|
|
break;
|
|
}
|
|
#endif
|
|
MYSQL_SERVER_my_error(net->last_errno, MYF(0));
|
|
break;
|
|
}
|
|
pos+=length;
|
|
update_statistics(thd_increment_bytes_sent(net->thd, length));
|
|
}
|
|
#ifndef _WIN32
|
|
end:
|
|
#endif
|
|
#ifdef HAVE_COMPRESS
|
|
if (net->compress)
|
|
my_free((void*) packet);
|
|
#endif
|
|
if (thr_alarm_in_use(&alarmed))
|
|
{
|
|
my_bool old_mode;
|
|
thr_end_alarm(&alarmed);
|
|
if (!net_blocking)
|
|
vio_blocking(net->vio, net_blocking, &old_mode);
|
|
}
|
|
net->reading_or_writing=0;
|
|
DBUG_RETURN(((int) (pos != end)));
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
** Read something from server/clinet
|
|
*****************************************************************************/
|
|
|
|
#ifndef NO_ALARM
|
|
|
|
static my_bool net_safe_read(NET *net, uchar *buff, size_t length,
|
|
thr_alarm_t *alarmed)
|
|
{
|
|
uint retry_count=0;
|
|
while (length > 0)
|
|
{
|
|
size_t tmp;
|
|
if ((long) (tmp= vio_read(net->vio, buff, length)) <= 0)
|
|
{
|
|
my_bool interrupted = vio_should_retry(net->vio);
|
|
if (!thr_got_alarm(alarmed) && interrupted)
|
|
{ /* Probably in MIT threads */
|
|
if (retry_count++ < net->retry_count)
|
|
continue;
|
|
}
|
|
return 1;
|
|
}
|
|
length-= tmp;
|
|
buff+= tmp;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
Help function to clear the commuication buffer when we get a too big packet.
|
|
|
|
@param net Communication handle
|
|
@param remain Bytes to read
|
|
@param alarmed Parameter for thr_alarm()
|
|
@param alarm_buff Parameter for thr_alarm()
|
|
|
|
@retval
|
|
0 Was able to read the whole packet
|
|
@retval
|
|
1 Got mailformed packet from client
|
|
*/
|
|
|
|
static my_bool my_net_skip_rest(NET *net, uint32 remain, thr_alarm_t *alarmed,
|
|
ALARM *alarm_buff)
|
|
{
|
|
longlong limit= net->max_packet_size*net->net_skip_rest_factor;
|
|
uint32 old=remain;
|
|
DBUG_ENTER("my_net_skip_rest");
|
|
DBUG_PRINT("enter",("bytes_to_skip: %u", (uint) remain));
|
|
|
|
/* The following is good for debugging */
|
|
update_statistics(thd_increment_net_big_packet_count(net->thd, 1));
|
|
|
|
if (!thr_alarm_in_use(alarmed))
|
|
{
|
|
my_bool old_mode;
|
|
if (thr_alarm(alarmed,net->read_timeout, alarm_buff) ||
|
|
vio_blocking(net->vio, TRUE, &old_mode) < 0)
|
|
DBUG_RETURN(1); /* Can't setup, abort */
|
|
}
|
|
for (;;)
|
|
{
|
|
while (remain > 0)
|
|
{
|
|
size_t length= MY_MIN(remain, net->max_packet);
|
|
if (net_safe_read(net, net->buff, length, alarmed))
|
|
DBUG_RETURN(1);
|
|
update_statistics(thd_increment_bytes_received(net->thd, length));
|
|
remain -= (uint32) length;
|
|
limit-= length;
|
|
if (limit < 0)
|
|
DBUG_RETURN(1);
|
|
}
|
|
if (old != MAX_PACKET_LENGTH)
|
|
break;
|
|
if (net_safe_read(net, net->buff, NET_HEADER_SIZE, alarmed))
|
|
DBUG_RETURN(1);
|
|
limit-= NET_HEADER_SIZE;
|
|
old=remain= uint3korr(net->buff);
|
|
net->pkt_nr++;
|
|
}
|
|
DBUG_RETURN(0);
|
|
}
|
|
#endif /* NO_ALARM */
|
|
|
|
|
|
/**
|
|
Try to parse and process proxy protocol header.
|
|
|
|
This function is called in case MySQL packet header cannot be parsed.
|
|
It checks if proxy header was sent, and that it was send from allowed remote
|
|
host, as defined by proxy-protocol-networks parameter.
|
|
|
|
If proxy header is parsed, then THD and ACL structures and changed to indicate
|
|
the new peer address and port.
|
|
|
|
Note, that proxy header can only be sent either when the connection is established,
|
|
or as the client reply packet to
|
|
*/
|
|
#undef IGNORE /* for Windows */
|
|
typedef enum { RETRY, ABORT, IGNORE} handle_proxy_header_result;
|
|
static handle_proxy_header_result handle_proxy_header(NET *net)
|
|
{
|
|
#if !defined(MYSQL_SERVER) || defined(EMBEDDED_LIBRARY)
|
|
return IGNORE;
|
|
#else
|
|
THD *thd= (THD *)net->thd;
|
|
|
|
if (!has_proxy_protocol_header(net) || !thd ||
|
|
thd->get_command() != COM_CONNECT)
|
|
return IGNORE;
|
|
|
|
/*
|
|
Proxy information found in the first 4 bytes received so far.
|
|
Read and parse proxy header , change peer ip address and port in THD.
|
|
*/
|
|
proxy_peer_info peer_info;
|
|
|
|
if (!thd->net.vio)
|
|
{
|
|
DBUG_ASSERT(0);
|
|
return ABORT;
|
|
}
|
|
|
|
if (!is_proxy_protocol_allowed((sockaddr *)&(thd->net.vio->remote)))
|
|
{
|
|
/* proxy-protocol-networks variable needs to be set to allow this remote address */
|
|
my_printf_error(ER_HOST_NOT_PRIVILEGED, "Proxy header is not accepted from %s",
|
|
MYF(0), thd->main_security_ctx.ip);
|
|
return ABORT;
|
|
}
|
|
|
|
if (parse_proxy_protocol_header(net, &peer_info))
|
|
{
|
|
/* Failed to parse proxy header*/
|
|
my_printf_error(ER_UNKNOWN_ERROR, "Failed to parse proxy header", MYF(0));
|
|
return ABORT;
|
|
}
|
|
|
|
if (peer_info.is_local_command)
|
|
/* proxy header indicates LOCAL connection, no action necessary */
|
|
return RETRY;
|
|
/* Change peer address in THD and ACL structures.*/
|
|
uint host_errors;
|
|
net->using_proxy_protocol= 1;
|
|
return (handle_proxy_header_result)thd_set_peer_addr(thd,
|
|
&(peer_info.peer_addr), NULL, peer_info.port,
|
|
false, &host_errors);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
Reads one packet to net->buff + net->where_b.
|
|
Long packets are handled by my_net_read().
|
|
This function reallocates the net->buff buffer if necessary.
|
|
|
|
@return
|
|
Returns length of packet.
|
|
*/
|
|
|
|
static ulong
|
|
my_real_read(NET *net, size_t *complen,
|
|
my_bool header __attribute__((unused)))
|
|
{
|
|
uchar *pos;
|
|
size_t length;
|
|
uint i,retry_count=0;
|
|
ulong len=packet_error;
|
|
my_bool expect_error_packet __attribute__((unused))= 0;
|
|
thr_alarm_t alarmed;
|
|
#ifndef NO_ALARM
|
|
ALARM alarm_buff;
|
|
#endif
|
|
|
|
retry:
|
|
|
|
my_bool net_blocking=vio_is_blocking(net->vio);
|
|
uint32 remain= (net->compress ? NET_HEADER_SIZE+COMP_HEADER_SIZE :
|
|
NET_HEADER_SIZE);
|
|
#ifdef MYSQL_SERVER
|
|
size_t count= remain;
|
|
struct st_net_server *server_extension= 0;
|
|
|
|
if (header)
|
|
{
|
|
server_extension= static_cast<st_net_server*> (net->extension);
|
|
if (server_extension != NULL)
|
|
{
|
|
void *user_data= server_extension->m_user_data;
|
|
server_extension->m_before_header(net, user_data, count);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
*complen = 0;
|
|
|
|
net->reading_or_writing=1;
|
|
thr_alarm_init(&alarmed);
|
|
#ifndef NO_ALARM
|
|
if (net_blocking)
|
|
thr_alarm(&alarmed,net->read_timeout,&alarm_buff);
|
|
#else
|
|
/* Read timeout is set in my_net_set_read_timeout */
|
|
#endif /* NO_ALARM */
|
|
|
|
pos = net->buff + net->where_b; /* net->packet -4 */
|
|
for (i=0 ; i < 2 ; i++)
|
|
{
|
|
while (remain > 0)
|
|
{
|
|
/* First read is done with non blocking mode */
|
|
if ((long) (length= vio_read(net->vio, pos, remain)) <= 0L)
|
|
{
|
|
my_bool interrupted = vio_should_retry(net->vio);
|
|
|
|
DBUG_PRINT("info",("vio_read returned %ld errno: %d",
|
|
(long) length, vio_errno(net->vio)));
|
|
|
|
if (i== 0 && unlikely(thd_net_is_killed((THD*) net->thd)))
|
|
{
|
|
DBUG_PRINT("info", ("thd is killed"));
|
|
len= packet_error;
|
|
net->error= 0;
|
|
net->last_errno= ER_CONNECTION_KILLED;
|
|
MYSQL_SERVER_my_error(net->last_errno, MYF(0));
|
|
goto end;
|
|
}
|
|
|
|
#if !defined(_WIN32) && defined(MYSQL_SERVER)
|
|
/*
|
|
We got an error that there was no data on the socket. We now set up
|
|
an alarm to not 'read forever', change the socket to the blocking
|
|
mode and try again
|
|
*/
|
|
if ((interrupted || length == 0) && !thr_alarm_in_use(&alarmed))
|
|
{
|
|
if (!thr_alarm(&alarmed,net->read_timeout,&alarm_buff)) /* Don't wait too long */
|
|
{
|
|
my_bool old_mode;
|
|
while (vio_blocking(net->vio, TRUE, &old_mode) < 0)
|
|
{
|
|
if (vio_should_retry(net->vio) &&
|
|
retry_count++ < net->retry_count)
|
|
continue;
|
|
DBUG_PRINT("error",
|
|
("fcntl returned error %d, aborting thread",
|
|
vio_errno(net->vio)));
|
|
EXTRA_DEBUG_fprintf(stderr,
|
|
"%s: read: fcntl returned error %d, aborting thread\n",
|
|
my_progname,vio_errno(net->vio));
|
|
len= packet_error;
|
|
net->error= 2; /* Close socket */
|
|
net->last_errno= ER_NET_FCNTL_ERROR;
|
|
MYSQL_SERVER_my_error(ER_NET_FCNTL_ERROR, MYF(0));
|
|
goto end;
|
|
}
|
|
retry_count=0;
|
|
continue;
|
|
}
|
|
}
|
|
#endif /* (!defined(_WIN32) && defined(MYSQL_SERVER) */
|
|
if (thr_alarm_in_use(&alarmed) && !thr_got_alarm(&alarmed) &&
|
|
interrupted)
|
|
{ /* Probably in MIT threads */
|
|
if (retry_count++ < net->retry_count)
|
|
continue;
|
|
EXTRA_DEBUG_fprintf(stderr, "%s: read looped with error %d on "
|
|
"file %lld, aborting thread\n",
|
|
my_progname, vio_errno(net->vio),
|
|
(longlong) vio_fd(net->vio));
|
|
}
|
|
#ifndef MYSQL_SERVER
|
|
if (length != 0 && vio_should_retry(net->vio))
|
|
{
|
|
DBUG_PRINT("warning",("Interrupted read. Retrying..."));
|
|
continue;
|
|
}
|
|
#endif
|
|
DBUG_PRINT("error",("Could not read packet: remain: %u errno: %d length: %ld",
|
|
remain, vio_errno(net->vio), (long) length));
|
|
len= packet_error;
|
|
net->error= 2; /* Close socket */
|
|
net->last_errno= (vio_was_timeout(net->vio) ?
|
|
ER_NET_READ_INTERRUPTED :
|
|
ER_NET_READ_ERROR);
|
|
#ifdef MYSQL_SERVER
|
|
if (global_system_variables.log_warnings > 3)
|
|
{
|
|
my_printf_error(net->last_errno,
|
|
"Could not read packet: fd: %lld state: %d "
|
|
"remain: %u errno: %d vio_errno: %d "
|
|
"length: %lld",
|
|
MYF(ME_ERROR_LOG),
|
|
(longlong) vio_fd(net->vio), (int) net->vio->state,
|
|
remain, vio_errno(net->vio), net->last_errno,
|
|
(longlong) length);
|
|
}
|
|
else
|
|
my_error(net->last_errno, MYF(0));
|
|
#endif /* MYSQL_SERVER */
|
|
goto end;
|
|
}
|
|
remain -= (uint32) length;
|
|
pos+= length;
|
|
update_statistics(thd_increment_bytes_received(net->thd, length));
|
|
}
|
|
|
|
#ifdef DEBUG_DATA_PACKETS
|
|
DBUG_DUMP("data_read", net->buff+net->where_b, length);
|
|
#endif
|
|
if (i == 0)
|
|
{ /* First parts is packet length */
|
|
size_t helping;
|
|
#ifndef DEBUG_DATA_PACKETS
|
|
DBUG_DUMP("packet_header", net->buff+net->where_b,
|
|
NET_HEADER_SIZE);
|
|
#endif
|
|
if (net->buff[net->where_b + 3] != (uchar) net->pkt_nr)
|
|
{
|
|
if (net->pkt_nr_can_be_reset)
|
|
{
|
|
/*
|
|
We are using a protocol like semi-sync where master and slave
|
|
sends packets in parallel.
|
|
Copy current one as it can be useful for debugging.
|
|
*/
|
|
net->pkt_nr= net->buff[net->where_b + 3];
|
|
}
|
|
else
|
|
{
|
|
#ifndef MYSQL_SERVER
|
|
if (net->buff[net->where_b + 3] == (uchar) (net->pkt_nr -1))
|
|
{
|
|
/*
|
|
If the server was killed then the server may have missed the
|
|
last sent client packet and the packet numbering may be one off.
|
|
*/
|
|
DBUG_PRINT("warning", ("Found possible out of order packets"));
|
|
expect_error_packet= 1;
|
|
}
|
|
else
|
|
#endif
|
|
goto packets_out_of_order;
|
|
}
|
|
}
|
|
net->compress_pkt_nr= ++net->pkt_nr;
|
|
#ifdef HAVE_COMPRESS
|
|
if (net->compress)
|
|
{
|
|
/*
|
|
The following uint3korr() may read 4 bytes, so make sure we don't
|
|
read unallocated or uninitialized memory. The right-hand expression
|
|
must match the size of the buffer allocated in net_realloc().
|
|
*/
|
|
DBUG_ASSERT(net->where_b + NET_HEADER_SIZE + sizeof(uint32) <=
|
|
net->max_packet + NET_HEADER_SIZE + COMP_HEADER_SIZE + 1);
|
|
/*
|
|
If the packet is compressed then complen > 0 and contains the
|
|
number of bytes in the uncompressed packet
|
|
*/
|
|
*complen=uint3korr(&(net->buff[net->where_b + NET_HEADER_SIZE]));
|
|
}
|
|
#endif
|
|
|
|
len=uint3korr(net->buff+net->where_b);
|
|
if (!len) /* End of big multi-packet */
|
|
goto end;
|
|
helping = MY_MAX(len,*complen) + net->where_b;
|
|
/* The necessary size of net->buff */
|
|
if (helping >= net->max_packet)
|
|
{
|
|
if (net_realloc(net,helping))
|
|
{
|
|
#if defined(MYSQL_SERVER) && !defined(NO_ALARM)
|
|
if (!net->compress &&
|
|
!my_net_skip_rest(net, (uint32) len, &alarmed, &alarm_buff))
|
|
net->error= 3; /* Successfully skiped packet */
|
|
#endif
|
|
len= packet_error; /* Return error and close connection */
|
|
goto end;
|
|
}
|
|
}
|
|
pos=net->buff + net->where_b;
|
|
remain = (uint32) len;
|
|
#ifdef MYSQL_SERVER
|
|
if (server_extension != NULL)
|
|
{
|
|
void *user_data= server_extension->m_user_data;
|
|
server_extension->m_after_header(net, user_data, count, 0);
|
|
server_extension= NULL;
|
|
}
|
|
#endif
|
|
}
|
|
#ifndef MYSQL_SERVER
|
|
else if (expect_error_packet)
|
|
{
|
|
/*
|
|
This check is safe both for compressed and not compressed protocol
|
|
as for the compressed protocol errors are not compressed anymore.
|
|
*/
|
|
if (net->buff[net->where_b] != (uchar) 255)
|
|
{
|
|
/* Restore pkt_nr to original value */
|
|
net->pkt_nr--;
|
|
goto packets_out_of_order;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
end:
|
|
if (thr_alarm_in_use(&alarmed))
|
|
{
|
|
my_bool old_mode;
|
|
thr_end_alarm(&alarmed);
|
|
if (!net_blocking)
|
|
vio_blocking(net->vio, net_blocking, &old_mode);
|
|
}
|
|
net->reading_or_writing=0;
|
|
#ifdef DEBUG_DATA_PACKETS
|
|
if (len != packet_error)
|
|
DBUG_DUMP("data_read", net->buff+net->where_b, len);
|
|
#endif
|
|
#ifdef MYSQL_SERVER
|
|
if (server_extension != NULL)
|
|
{
|
|
void *user_data= server_extension->m_user_data;
|
|
server_extension->m_after_header(net, user_data, count, 1);
|
|
DBUG_ASSERT(len == packet_error || len == 0);
|
|
}
|
|
#endif
|
|
return(len);
|
|
|
|
packets_out_of_order:
|
|
{
|
|
switch (handle_proxy_header(net)) {
|
|
case ABORT:
|
|
/* error happened, message is already written. */
|
|
len= packet_error;
|
|
goto end;
|
|
case RETRY:
|
|
goto retry;
|
|
case IGNORE:
|
|
break;
|
|
}
|
|
|
|
DBUG_PRINT("error",
|
|
("Packets out of order (Found: %d, expected %u)",
|
|
(int) net->buff[net->where_b + 3],
|
|
net->pkt_nr));
|
|
EXTRA_DEBUG_ASSERT(0);
|
|
/*
|
|
We don't make noise server side, since the client is expected
|
|
to break the protocol for e.g. --send LOAD DATA .. LOCAL where
|
|
the server expects the client to send a file, but the client
|
|
may reply with a new command instead.
|
|
*/
|
|
#ifndef MYSQL_SERVER
|
|
EXTRA_DEBUG_fflush(stdout);
|
|
EXTRA_DEBUG_fprintf(stderr,"Error: Packets out of order (Found: %d, expected %d)\n",
|
|
(int) net->buff[net->where_b + 3],
|
|
(uint) (uchar) net->pkt_nr);
|
|
EXTRA_DEBUG_fflush(stderr);
|
|
#endif
|
|
len= packet_error;
|
|
MYSQL_SERVER_my_error(ER_NET_PACKETS_OUT_OF_ORDER, MYF(0));
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/* Old interface. See my_net_read_packet() for function description */
|
|
|
|
#undef my_net_read
|
|
|
|
ulong my_net_read(NET *net)
|
|
{
|
|
return my_net_read_packet(net, 0);
|
|
}
|
|
|
|
|
|
/**
|
|
Read a packet from the client/server and return it without the internal
|
|
package header.
|
|
|
|
If the packet is the first packet of a multi-packet packet
|
|
(which is indicated by the length of the packet = 0xffffff) then
|
|
all sub packets are read and concatenated.
|
|
|
|
If the packet was compressed, its uncompressed and the length of the
|
|
uncompressed packet is returned.
|
|
|
|
read_from_server is set when the server is reading a new command
|
|
from the client.
|
|
|
|
@return
|
|
The function returns the length of the found packet or packet_error.
|
|
net->read_pos points to the read data.
|
|
*/
|
|
ulong
|
|
my_net_read_packet(NET *net, my_bool read_from_server)
|
|
{
|
|
ulong reallen = 0;
|
|
ulong length;
|
|
DBUG_ENTER("my_net_read_packet");
|
|
length= my_net_read_packet_reallen(net, read_from_server, &reallen);
|
|
DBUG_RETURN(length);
|
|
}
|
|
|
|
|
|
ulong
|
|
my_net_read_packet_reallen(NET *net, my_bool read_from_server, ulong* reallen)
|
|
{
|
|
size_t len, complen;
|
|
|
|
MYSQL_NET_READ_START();
|
|
|
|
*reallen = 0;
|
|
#ifdef HAVE_COMPRESS
|
|
if (!net->compress)
|
|
{
|
|
#endif
|
|
len = my_real_read(net,&complen, read_from_server);
|
|
if (len == MAX_PACKET_LENGTH)
|
|
{
|
|
/* First packet of a multi-packet. Concatenate the packets */
|
|
ulong save_pos = net->where_b;
|
|
size_t total_length= 0;
|
|
do
|
|
{
|
|
net->where_b += (ulong)len;
|
|
total_length += len;
|
|
len = my_real_read(net,&complen, 0);
|
|
} while (len == MAX_PACKET_LENGTH);
|
|
if (likely(len != packet_error))
|
|
len+= total_length;
|
|
net->where_b = save_pos;
|
|
}
|
|
|
|
net->read_pos = net->buff + net->where_b;
|
|
if (likely(len != packet_error))
|
|
{
|
|
net->read_pos[len]=0; /* Safeguard for mysql_use_result */
|
|
*reallen = (ulong)len;
|
|
}
|
|
MYSQL_NET_READ_DONE(0, len);
|
|
return (ulong)len;
|
|
#ifdef HAVE_COMPRESS
|
|
}
|
|
else
|
|
{
|
|
/* We are using the compressed protocol */
|
|
|
|
ulong buf_length;
|
|
ulong start_of_packet;
|
|
ulong first_packet_offset;
|
|
uint read_length, multi_byte_packet=0;
|
|
|
|
if (net->remain_in_buf)
|
|
{
|
|
buf_length= net->buf_length; /* Data left in old packet */
|
|
first_packet_offset= start_of_packet= (net->buf_length -
|
|
net->remain_in_buf);
|
|
/* Restore the character that was overwritten by the end 0 */
|
|
net->buff[start_of_packet]= net->save_char;
|
|
}
|
|
else
|
|
{
|
|
/* reuse buffer, as there is nothing in it that we need */
|
|
buf_length= start_of_packet= first_packet_offset= 0;
|
|
}
|
|
for (;;)
|
|
{
|
|
ulong packet_len;
|
|
|
|
if (buf_length - start_of_packet >= NET_HEADER_SIZE)
|
|
{
|
|
read_length = uint3korr(net->buff+start_of_packet);
|
|
if (!read_length)
|
|
{
|
|
/* End of multi-byte packet */
|
|
start_of_packet += NET_HEADER_SIZE;
|
|
break;
|
|
}
|
|
if (read_length + NET_HEADER_SIZE <= buf_length - start_of_packet)
|
|
{
|
|
if (multi_byte_packet)
|
|
{
|
|
/* Remove packet header for second packet */
|
|
memmove(net->buff + first_packet_offset + start_of_packet,
|
|
net->buff + first_packet_offset + start_of_packet +
|
|
NET_HEADER_SIZE,
|
|
buf_length - start_of_packet);
|
|
start_of_packet += read_length;
|
|
buf_length -= NET_HEADER_SIZE;
|
|
}
|
|
else
|
|
start_of_packet+= read_length + NET_HEADER_SIZE;
|
|
|
|
if (read_length != MAX_PACKET_LENGTH) /* last package */
|
|
{
|
|
multi_byte_packet= 0; /* No last zero len packet */
|
|
break;
|
|
}
|
|
multi_byte_packet= NET_HEADER_SIZE;
|
|
/* Move data down to read next data packet after current one */
|
|
if (first_packet_offset)
|
|
{
|
|
memmove(net->buff,net->buff+first_packet_offset,
|
|
buf_length-first_packet_offset);
|
|
buf_length-=first_packet_offset;
|
|
start_of_packet -= first_packet_offset;
|
|
first_packet_offset=0;
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
/* Move data down to read next data packet after current one */
|
|
if (first_packet_offset)
|
|
{
|
|
memmove(net->buff,net->buff+first_packet_offset,
|
|
buf_length-first_packet_offset);
|
|
buf_length-=first_packet_offset;
|
|
start_of_packet -= first_packet_offset;
|
|
first_packet_offset=0;
|
|
}
|
|
|
|
net->where_b=buf_length;
|
|
if ((packet_len = my_real_read(net,&complen, read_from_server))
|
|
== packet_error)
|
|
{
|
|
MYSQL_NET_READ_DONE(1, 0);
|
|
return packet_error;
|
|
}
|
|
read_from_server= 0;
|
|
if (my_uncompress(net->buff + net->where_b, packet_len,
|
|
&complen))
|
|
{
|
|
net->error= 2; /* caller will close socket */
|
|
net->last_errno= ER_NET_UNCOMPRESS_ERROR;
|
|
MYSQL_SERVER_my_error(ER_NET_UNCOMPRESS_ERROR, MYF(0));
|
|
MYSQL_NET_READ_DONE(1, 0);
|
|
return packet_error;
|
|
}
|
|
buf_length+= (ulong)complen;
|
|
*reallen += packet_len;
|
|
}
|
|
|
|
net->read_pos= net->buff+ first_packet_offset + NET_HEADER_SIZE;
|
|
net->buf_length= buf_length;
|
|
net->remain_in_buf= (ulong) (buf_length - start_of_packet);
|
|
len = ((ulong) (start_of_packet - first_packet_offset) - NET_HEADER_SIZE -
|
|
multi_byte_packet);
|
|
net->save_char= net->read_pos[len]; /* Must be saved */
|
|
net->read_pos[len]=0; /* Safeguard for mysql_use_result */
|
|
}
|
|
#endif /* HAVE_COMPRESS */
|
|
MYSQL_NET_READ_DONE(0, len);
|
|
return (ulong)len;
|
|
}
|
|
|
|
|
|
void my_net_set_read_timeout(NET *net, uint timeout)
|
|
{
|
|
DBUG_ENTER("my_net_set_read_timeout");
|
|
DBUG_PRINT("enter", ("timeout: %d", timeout));
|
|
if (net->read_timeout != timeout)
|
|
{
|
|
net->read_timeout= timeout;
|
|
if (net->vio)
|
|
vio_timeout(net->vio, 0, timeout);
|
|
}
|
|
DBUG_VOID_RETURN;
|
|
}
|
|
|
|
|
|
void my_net_set_write_timeout(NET *net, uint timeout)
|
|
{
|
|
DBUG_ENTER("my_net_set_write_timeout");
|
|
DBUG_PRINT("enter", ("timeout: %d", timeout));
|
|
if (net->write_timeout != timeout)
|
|
{
|
|
net->write_timeout= timeout;
|
|
if (net->vio)
|
|
vio_timeout(net->vio, 1, timeout);
|
|
}
|
|
DBUG_VOID_RETURN;
|
|
}
|