mirror of
https://github.com/MariaDB/server.git
synced 2025-10-31 15:50:51 +03:00
0a35bd923f
(Removes some warnings about UNIX_TIMESTAMP from the slave.err logs) Marked federated_server as a '--big-test' Change error in net_clear to 'Note', as it interfered with mysql-test-run.
1145 lines
31 KiB
C++
1145 lines
31 KiB
C++
/* Copyright (C) 2000 MySQL AB
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
|
|
|
|
/*
|
|
This file is the net layer API for the MySQL client/server protocol,
|
|
which is a tightly coupled, proprietary protocol owned by MySQL AB.
|
|
Any re-implementations of this protocol must also be under GPL
|
|
unless one has got an license from MySQL AB stating otherwise.
|
|
*/
|
|
|
|
/*
|
|
Write and read of logical packets to/from socket
|
|
|
|
Writes are cached into net_buffer_length big packets.
|
|
Read packets are reallocated dynamicly when reading big packets.
|
|
Each logical packet has the following pre-info:
|
|
3 byte length & 1 byte package-number.
|
|
|
|
This file needs to be written in C as it's used by the libmysql client as a
|
|
C file.
|
|
*/
|
|
|
|
/*
|
|
HFTODO this must be hidden if we don't want client capabilities in
|
|
embedded library
|
|
*/
|
|
#include <my_global.h>
|
|
#include <mysql.h>
|
|
#include <mysql_embed.h>
|
|
#include <mysql_com.h>
|
|
#include <mysqld_error.h>
|
|
#include <my_sys.h>
|
|
#include <m_string.h>
|
|
#include <my_net.h>
|
|
#include <violite.h>
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#ifdef __NETWARE__
|
|
#include <sys/select.h>
|
|
#endif
|
|
|
|
#ifdef EMBEDDED_LIBRARY
|
|
#undef MYSQL_SERVER
|
|
#undef MYSQL_CLIENT
|
|
#define MYSQL_CLIENT
|
|
#endif /*EMBEDDED_LIBRARY */
|
|
|
|
|
|
/*
|
|
The following handles the differences when this is linked between the
|
|
client and the server.
|
|
|
|
This gives an error if a too big packet is found
|
|
The server can change this with the -O switch, but because the client
|
|
can't normally do this the client should have a bigger max_allowed_packet.
|
|
*/
|
|
|
|
#if defined(__WIN__) || !defined(MYSQL_SERVER)
|
|
/* The following is because alarms doesn't work on windows. */
|
|
#define NO_ALARM
|
|
#endif
|
|
|
|
#ifndef NO_ALARM
|
|
#include "my_pthread.h"
|
|
void sql_print_error(const char *format,...);
|
|
#else
|
|
#define DONT_USE_THR_ALARM
|
|
#endif /* NO_ALARM */
|
|
|
|
#include "thr_alarm.h"
|
|
|
|
#ifdef MYSQL_SERVER
|
|
/*
|
|
The following variables/functions should really not be declared
|
|
extern, but as it's hard to include mysql_priv.h here, we have to
|
|
live with this for a while.
|
|
*/
|
|
extern uint test_flags;
|
|
extern ulong bytes_sent, bytes_received, net_big_packet_count;
|
|
extern pthread_mutex_t LOCK_bytes_sent , LOCK_bytes_received;
|
|
#ifndef MYSQL_INSTANCE_MANAGER
|
|
#ifdef HAVE_QUERY_CACHE
|
|
#define USE_QUERY_CACHE
|
|
extern void query_cache_init_query(NET *net);
|
|
extern void query_cache_insert(NET *net, const char *packet, ulong length);
|
|
#endif // HAVE_QUERY_CACHE
|
|
#define update_statistics(A) A
|
|
#endif /* MYSQL_INSTANCE_MANGER */
|
|
#endif /* defined(MYSQL_SERVER) && !defined(MYSQL_INSTANCE_MANAGER) */
|
|
|
|
#if !defined(MYSQL_SERVER) || defined(MYSQL_INSTANCE_MANAGER)
|
|
#define update_statistics(A)
|
|
#define thd_increment_bytes_sent(N)
|
|
#endif
|
|
|
|
#define TEST_BLOCKING 8
|
|
#define MAX_PACKET_LENGTH (256L*256L*256L-1)
|
|
|
|
static my_bool net_write_buff(NET *net,const char *packet,ulong len);
|
|
|
|
|
|
/* Init with packet info */
|
|
|
|
my_bool my_net_init(NET *net, Vio* vio)
|
|
{
|
|
DBUG_ENTER("my_net_init");
|
|
my_net_local_init(net); /* Set some limits */
|
|
if (!(net->buff=(uchar*) my_malloc((uint32) net->max_packet+
|
|
NET_HEADER_SIZE + COMP_HEADER_SIZE,
|
|
MYF(MY_WME))))
|
|
DBUG_RETURN(1);
|
|
net->buff_end=net->buff+net->max_packet;
|
|
net->vio = vio;
|
|
net->no_send_ok= net->no_send_eof= net->no_send_error= 0;
|
|
net->error=0; net->return_errno=0; net->return_status=0;
|
|
net->pkt_nr=net->compress_pkt_nr=0;
|
|
net->write_pos=net->read_pos = net->buff;
|
|
net->last_error[0]=0;
|
|
net->compress=0; net->reading_or_writing=0;
|
|
net->where_b = net->remain_in_buf=0;
|
|
net->last_errno=0;
|
|
#ifdef USE_QUERY_CACHE
|
|
query_cache_init_query(net);
|
|
#else
|
|
net->query_cache_query= 0;
|
|
#endif
|
|
net->report_error= 0;
|
|
|
|
if (vio != 0) /* If real connection */
|
|
{
|
|
net->fd = vio_fd(vio); /* For perl DBI/DBD */
|
|
#if defined(MYSQL_SERVER) && !defined(__WIN__)
|
|
if (!(test_flags & TEST_BLOCKING))
|
|
{
|
|
my_bool old_mode;
|
|
vio_blocking(vio, FALSE, &old_mode);
|
|
}
|
|
#endif
|
|
vio_fastsend(vio);
|
|
}
|
|
DBUG_RETURN(0);
|
|
}
|
|
|
|
|
|
void net_end(NET *net)
|
|
{
|
|
DBUG_ENTER("net_end");
|
|
my_free((gptr) net->buff,MYF(MY_ALLOW_ZERO_PTR));
|
|
net->buff=0;
|
|
DBUG_VOID_RETURN;
|
|
}
|
|
|
|
|
|
/* Realloc the packet buffer */
|
|
|
|
my_bool net_realloc(NET *net, ulong length)
|
|
{
|
|
uchar *buff;
|
|
ulong pkt_length;
|
|
DBUG_ENTER("net_realloc");
|
|
DBUG_PRINT("enter",("length: %lu", length));
|
|
|
|
if (length >= net->max_packet_size)
|
|
{
|
|
DBUG_PRINT("error", ("Packet too large. Max size: %lu",
|
|
net->max_packet_size));
|
|
net->error= 1;
|
|
net->report_error= 1;
|
|
net->last_errno= ER_NET_PACKET_TOO_LARGE;
|
|
DBUG_RETURN(1);
|
|
}
|
|
pkt_length = (length+IO_SIZE-1) & ~(IO_SIZE-1);
|
|
/*
|
|
We must allocate some extra bytes for the end 0 and to be able to
|
|
read big compressed blocks
|
|
*/
|
|
if (!(buff=(uchar*) my_realloc((char*) net->buff, (uint32) pkt_length +
|
|
NET_HEADER_SIZE + COMP_HEADER_SIZE,
|
|
MYF(MY_WME))))
|
|
{
|
|
net->error= 1;
|
|
net->report_error= 1;
|
|
net->last_errno= ER_OUT_OF_RESOURCES;
|
|
DBUG_RETURN(1);
|
|
}
|
|
net->buff=net->write_pos=buff;
|
|
net->buff_end=buff+(net->max_packet=pkt_length);
|
|
DBUG_RETURN(0);
|
|
}
|
|
|
|
|
|
/*
|
|
Check if there is any data to be read from the socket
|
|
|
|
SYNOPSIS
|
|
net_data_is_ready()
|
|
sd socket descriptor
|
|
|
|
DESCRIPTION
|
|
Check if there is any data to be read from the socket.
|
|
|
|
RETURN VALUES
|
|
0 No data to read
|
|
1 Data or EOF to read
|
|
-1 Don't know if data is ready or not
|
|
*/
|
|
|
|
#if !defined(EMBEDDED_LIBRARY)
|
|
|
|
static int net_data_is_ready(my_socket sd)
|
|
{
|
|
#ifdef HAVE_POLL
|
|
struct pollfd ufds;
|
|
int res;
|
|
|
|
ufds.fd= sd;
|
|
ufds.events= POLLIN | POLLPRI;
|
|
if (!(res= poll(&ufds, 1, 0)))
|
|
return 0;
|
|
if (res < 0 || !(ufds.revents & (POLLIN | POLLPRI)))
|
|
return 0;
|
|
return 1;
|
|
#else
|
|
fd_set sfds;
|
|
struct timeval tv;
|
|
int res;
|
|
|
|
#ifndef __WIN__
|
|
/* Windows uses an _array_ of 64 fd's as default, so it's safe */
|
|
if (sd >= FD_SETSIZE)
|
|
return -1;
|
|
#define NET_DATA_IS_READY_CAN_RETURN_MINUS_ONE
|
|
#endif
|
|
|
|
FD_ZERO(&sfds);
|
|
FD_SET(sd, &sfds);
|
|
|
|
tv.tv_sec= tv.tv_usec= 0;
|
|
|
|
if ((res= select(sd+1, &sfds, NULL, NULL, &tv)) < 0)
|
|
return 0;
|
|
else
|
|
return test(res ? FD_ISSET(sd, &sfds) : 0);
|
|
#endif /* HAVE_POLL */
|
|
}
|
|
|
|
#endif /* EMBEDDED_LIBRARY */
|
|
|
|
/*
|
|
Remove unwanted characters from connection
|
|
and check if disconnected
|
|
|
|
SYNOPSIS
|
|
net_clear()
|
|
net NET handler
|
|
clear_buffer If <> 0, then clear all data from communication buffer
|
|
|
|
DESCRIPTION
|
|
Read from socket until there is nothing more to read. Discard
|
|
what is read.
|
|
|
|
If there is anything when to read 'net_clear' is called this
|
|
normally indicates an error in the protocol.
|
|
|
|
When connection is properly closed (for TCP it means with
|
|
a FIN packet), then select() considers a socket "ready to read",
|
|
in the sense that there's EOF to read, but read() returns 0.
|
|
|
|
*/
|
|
|
|
void net_clear(NET *net, my_bool clear_buffer)
|
|
{
|
|
#if !defined(EMBEDDED_LIBRARY)
|
|
int count, ready;
|
|
#endif
|
|
DBUG_ENTER("net_clear");
|
|
|
|
#if !defined(EMBEDDED_LIBRARY)
|
|
if (clear_buffer)
|
|
{
|
|
while ((ready= net_data_is_ready(net->vio->sd)) > 0)
|
|
{
|
|
/* The socket is ready */
|
|
if ((count= vio_read(net->vio, (char*) (net->buff),
|
|
(uint32) net->max_packet)) > 0)
|
|
{
|
|
DBUG_PRINT("info",("skipped %d bytes from file: %s",
|
|
count, vio_description(net->vio)));
|
|
#if defined(EXTRA_DEBUG)
|
|
fprintf(stderr,"Note: net_clear() skipped %d bytes from file: %s\n",
|
|
count, vio_description(net->vio));
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
DBUG_PRINT("info",("socket ready but only EOF to read - disconnected"));
|
|
net->error= 2;
|
|
break;
|
|
}
|
|
}
|
|
#ifdef NET_DATA_IS_READY_CAN_RETURN_MINUS_ONE
|
|
/* 'net_data_is_ready' returned "don't know" */
|
|
if (ready == -1)
|
|
{
|
|
/* Read unblocking to clear net */
|
|
my_bool old_mode;
|
|
if (!vio_blocking(net->vio, FALSE, &old_mode))
|
|
{
|
|
while ((count= vio_read(net->vio, (char*) (net->buff),
|
|
(uint32) net->max_packet)) > 0)
|
|
DBUG_PRINT("info",("skipped %d bytes from file: %s",
|
|
count, vio_description(net->vio)));
|
|
vio_blocking(net->vio, TRUE, &old_mode);
|
|
}
|
|
}
|
|
#endif /* NET_DATA_IS_READY_CAN_RETURN_MINUS_ONE */
|
|
}
|
|
#endif /* EMBEDDED_LIBRARY */
|
|
net->pkt_nr=net->compress_pkt_nr=0; /* Ready for new command */
|
|
net->write_pos=net->buff;
|
|
DBUG_VOID_RETURN;
|
|
}
|
|
|
|
|
|
/* Flush write_buffer if not empty. */
|
|
|
|
my_bool net_flush(NET *net)
|
|
{
|
|
my_bool error= 0;
|
|
DBUG_ENTER("net_flush");
|
|
if (net->buff != net->write_pos)
|
|
{
|
|
error=test(net_real_write(net,(char*) net->buff,
|
|
(ulong) (net->write_pos - net->buff)));
|
|
net->write_pos=net->buff;
|
|
}
|
|
/* Sync packet number if using compression */
|
|
if (net->compress)
|
|
net->pkt_nr=net->compress_pkt_nr;
|
|
DBUG_RETURN(error);
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
** Write something to server/client buffer
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
Write a logical packet with packet header
|
|
Format: Packet length (3 bytes), packet number(1 byte)
|
|
When compression is used a 3 byte compression length is added
|
|
|
|
NOTE
|
|
If compression is used the original package is modified!
|
|
*/
|
|
|
|
my_bool
|
|
my_net_write(NET *net,const char *packet,ulong len)
|
|
{
|
|
uchar buff[NET_HEADER_SIZE];
|
|
if (unlikely(!net->vio)) /* nowhere to write */
|
|
return 0;
|
|
/*
|
|
Big packets are handled by splitting them in packets of MAX_PACKET_LENGTH
|
|
length. The last packet is always a packet that is < MAX_PACKET_LENGTH.
|
|
(The last packet may even have a length of 0)
|
|
*/
|
|
while (len >= MAX_PACKET_LENGTH)
|
|
{
|
|
const ulong z_size = MAX_PACKET_LENGTH;
|
|
int3store(buff, z_size);
|
|
buff[3]= (uchar) net->pkt_nr++;
|
|
if (net_write_buff(net, (char*) buff, NET_HEADER_SIZE) ||
|
|
net_write_buff(net, packet, z_size))
|
|
return 1;
|
|
packet += z_size;
|
|
len-= z_size;
|
|
}
|
|
/* Write last packet */
|
|
int3store(buff,len);
|
|
buff[3]= (uchar) net->pkt_nr++;
|
|
if (net_write_buff(net,(char*) buff,NET_HEADER_SIZE))
|
|
return 1;
|
|
#ifndef DEBUG_DATA_PACKETS
|
|
DBUG_DUMP("packet_header",(char*) buff,NET_HEADER_SIZE);
|
|
#endif
|
|
return test(net_write_buff(net,packet,len));
|
|
}
|
|
|
|
/*
|
|
Send a command to the server.
|
|
|
|
SYNOPSIS
|
|
net_write_command()
|
|
net NET handler
|
|
command Command in MySQL server (enum enum_server_command)
|
|
header Header to write after command
|
|
head_len Length of header
|
|
packet Query or parameter to query
|
|
len Length of packet
|
|
|
|
DESCRIPTION
|
|
The reason for having both header and packet is so that libmysql
|
|
can easy add a header to a special command (like prepared statements)
|
|
without having to re-alloc the string.
|
|
|
|
As the command is part of the first data packet, we have to do some data
|
|
juggling to put the command in there, without having to create a new
|
|
packet.
|
|
This function will split big packets into sub-packets if needed.
|
|
(Each sub packet can only be 2^24 bytes)
|
|
|
|
RETURN VALUES
|
|
0 ok
|
|
1 error
|
|
*/
|
|
|
|
my_bool
|
|
net_write_command(NET *net,uchar command,
|
|
const char *header, ulong head_len,
|
|
const char *packet, ulong len)
|
|
{
|
|
ulong length=len+1+head_len; /* 1 extra byte for command */
|
|
uchar buff[NET_HEADER_SIZE+1];
|
|
uint header_size=NET_HEADER_SIZE+1;
|
|
DBUG_ENTER("net_write_command");
|
|
DBUG_PRINT("enter",("length: %lu", len));
|
|
|
|
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,(char*) buff, header_size) ||
|
|
net_write_buff(net, header, head_len) ||
|
|
net_write_buff(net, packet, len))
|
|
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++;
|
|
DBUG_RETURN(test(net_write_buff(net, (char*) buff, header_size) ||
|
|
(head_len && net_write_buff(net, (char*) header, head_len)) ||
|
|
net_write_buff(net, packet, len) || net_flush(net)));
|
|
}
|
|
|
|
/*
|
|
Caching the data in a local buffer before sending it.
|
|
|
|
SYNOPSIS
|
|
net_write_buff()
|
|
net Network handler
|
|
packet Packet to send
|
|
len Length of packet
|
|
|
|
DESCRIPTION
|
|
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.
|
|
|
|
NOTES
|
|
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.
|
|
|
|
RETURN
|
|
0 ok
|
|
1
|
|
*/
|
|
|
|
static my_bool
|
|
net_write_buff(NET *net,const char *packet,ulong len)
|
|
{
|
|
ulong left_length;
|
|
if (net->compress && net->max_packet > MAX_PACKET_LENGTH)
|
|
left_length= MAX_PACKET_LENGTH - (net->write_pos - net->buff);
|
|
else
|
|
left_length= (ulong) (net->buff_end - net->write_pos);
|
|
|
|
#ifdef DEBUG_DATA_PACKETS
|
|
DBUG_DUMP("data", 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,(char*) net->buff,
|
|
(ulong) (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 */
|
|
}
|
|
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.
|
|
*/
|
|
|
|
int
|
|
net_real_write(NET *net,const char *packet,ulong len)
|
|
{
|
|
long int length;
|
|
char *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) && defined(USE_QUERY_CACHE)
|
|
query_cache_insert(net, packet, len);
|
|
#endif
|
|
|
|
if (net->error == 2)
|
|
DBUG_RETURN(-1); /* socket can't be used */
|
|
|
|
net->reading_or_writing=2;
|
|
#ifdef HAVE_COMPRESS
|
|
if (net->compress)
|
|
{
|
|
ulong complen;
|
|
uchar *b;
|
|
uint header_length=NET_HEADER_SIZE+COMP_HEADER_SIZE;
|
|
if (!(b=(uchar*) my_malloc((uint32) len + NET_HEADER_SIZE +
|
|
COMP_HEADER_SIZE, MYF(MY_WME))))
|
|
{
|
|
#ifdef MYSQL_SERVER
|
|
net->last_errno= ER_OUT_OF_RESOURCES;
|
|
net->error= 2;
|
|
/* TODO is it needed to set this variable if we have no socket */
|
|
net->report_error= 1;
|
|
#endif
|
|
net->reading_or_writing= 0;
|
|
DBUG_RETURN(1);
|
|
}
|
|
memcpy(b+header_length,packet,len);
|
|
|
|
if (my_compress((byte*) 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= (char*) b;
|
|
}
|
|
#endif /* HAVE_COMPRESS */
|
|
|
|
#ifdef DEBUG_DATA_PACKETS
|
|
DBUG_DUMP("data",packet,len);
|
|
#endif
|
|
|
|
#ifndef NO_ALARM
|
|
thr_alarm_init(&alarmed);
|
|
if (net_blocking)
|
|
thr_alarm(&alarmed,(uint) net->write_timeout,&alarm_buff);
|
|
#else
|
|
alarmed=0;
|
|
/* Write timeout is set in net_set_write_timeout */
|
|
#endif /* NO_ALARM */
|
|
|
|
pos=(char*) packet; end=pos+len;
|
|
while (pos != end)
|
|
{
|
|
if ((long) (length=vio_write(net->vio,pos,(uint32) (end-pos))) <= 0)
|
|
{
|
|
my_bool interrupted = vio_should_retry(net->vio);
|
|
#if !defined(__WIN__)
|
|
if ((interrupted || length==0) && !thr_alarm_in_use(&alarmed))
|
|
{
|
|
if (!thr_alarm(&alarmed,(uint) 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;
|
|
#ifdef EXTRA_DEBUG
|
|
fprintf(stderr,
|
|
"%s: my_net_write: fcntl returned error %d, aborting thread\n",
|
|
my_progname,vio_errno(net->vio));
|
|
#endif /* EXTRA_DEBUG */
|
|
#ifdef MYSQL_SERVER
|
|
net->last_errno= ER_NET_ERROR_ON_WRITE;
|
|
#endif
|
|
net->error= 2; /* Close socket */
|
|
net->report_error= 1;
|
|
goto end;
|
|
}
|
|
retry_count=0;
|
|
continue;
|
|
}
|
|
}
|
|
else
|
|
#endif /* !defined(__WIN__) */
|
|
if (thr_alarm_in_use(&alarmed) && !thr_got_alarm(&alarmed) &&
|
|
interrupted)
|
|
{
|
|
if (retry_count++ < net->retry_count)
|
|
continue;
|
|
#ifdef EXTRA_DEBUG
|
|
fprintf(stderr, "%s: write looped, aborting thread\n",
|
|
my_progname);
|
|
#endif /* EXTRA_DEBUG */
|
|
}
|
|
#if defined(THREAD_SAFE_CLIENT) && !defined(MYSQL_SERVER)
|
|
if (vio_errno(net->vio) == SOCKET_EINTR)
|
|
{
|
|
DBUG_PRINT("warning",("Interrupted write. Retrying..."));
|
|
continue;
|
|
}
|
|
#endif /* defined(THREAD_SAFE_CLIENT) && !defined(MYSQL_SERVER) */
|
|
net->error= 2; /* Close socket */
|
|
net->report_error= 1;
|
|
#ifdef MYSQL_SERVER
|
|
net->last_errno= (interrupted ? ER_NET_WRITE_INTERRUPTED :
|
|
ER_NET_ERROR_ON_WRITE);
|
|
#endif /* MYSQL_SERVER */
|
|
break;
|
|
}
|
|
pos+=length;
|
|
update_statistics(thd_increment_bytes_sent(length));
|
|
}
|
|
#ifndef __WIN__
|
|
end:
|
|
#endif
|
|
#ifdef HAVE_COMPRESS
|
|
if (net->compress)
|
|
my_free((char*) packet,MYF(0));
|
|
#endif
|
|
if (thr_alarm_in_use(&alarmed))
|
|
{
|
|
my_bool old_mode;
|
|
thr_end_alarm(&alarmed);
|
|
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, char *buff, uint32 length,
|
|
thr_alarm_t *alarmed)
|
|
{
|
|
uint retry_count=0;
|
|
while (length > 0)
|
|
{
|
|
int tmp;
|
|
if ((tmp=vio_read(net->vio,(char*) net->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;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
Help function to clear the commuication buffer when we get a too big packet.
|
|
|
|
SYNOPSIS
|
|
my_net_skip_rest()
|
|
net Communication handle
|
|
remain Bytes to read
|
|
alarmed Parameter for thr_alarm()
|
|
alarm_buff Parameter for thr_alarm()
|
|
|
|
RETURN VALUES
|
|
0 Was able to read the whole packet
|
|
1 Got mailformed packet from client
|
|
*/
|
|
|
|
static my_bool my_net_skip_rest(NET *net, uint32 remain, thr_alarm_t *alarmed,
|
|
ALARM *alarm_buff)
|
|
{
|
|
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(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)
|
|
{
|
|
uint length= min(remain, net->max_packet);
|
|
if (net_safe_read(net, (char*) net->buff, length, alarmed))
|
|
DBUG_RETURN(1);
|
|
update_statistics(thd_increment_bytes_received(length));
|
|
remain -= (uint32) length;
|
|
}
|
|
if (old != MAX_PACKET_LENGTH)
|
|
break;
|
|
if (net_safe_read(net, (char*) net->buff, NET_HEADER_SIZE, alarmed))
|
|
DBUG_RETURN(1);
|
|
old=remain= uint3korr(net->buff);
|
|
net->pkt_nr++;
|
|
}
|
|
DBUG_RETURN(0);
|
|
}
|
|
#endif /* NO_ALARM */
|
|
|
|
|
|
/*
|
|
Reads one packet to net->buff + net->where_b
|
|
Returns length of packet. Long packets are handled by my_net_read().
|
|
This function reallocates the net->buff buffer if necessary.
|
|
*/
|
|
|
|
static ulong
|
|
my_real_read(NET *net, ulong *complen)
|
|
{
|
|
uchar *pos;
|
|
long length;
|
|
uint i,retry_count=0;
|
|
ulong len=packet_error;
|
|
thr_alarm_t alarmed;
|
|
#ifndef NO_ALARM
|
|
ALARM alarm_buff;
|
|
#endif
|
|
my_bool net_blocking=vio_is_blocking(net->vio);
|
|
uint32 remain= (net->compress ? NET_HEADER_SIZE+COMP_HEADER_SIZE :
|
|
NET_HEADER_SIZE);
|
|
*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 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 ((int) (length=vio_read(net->vio,(char*) pos,remain)) <= 0L)
|
|
{
|
|
my_bool interrupted = vio_should_retry(net->vio);
|
|
|
|
DBUG_PRINT("info",("vio_read returned %ld errno: %d",
|
|
length, vio_errno(net->vio)));
|
|
#if !defined(__WIN__) || 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 non 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)));
|
|
#ifdef EXTRA_DEBUG
|
|
fprintf(stderr,
|
|
"%s: read: fcntl returned error %d, aborting thread\n",
|
|
my_progname,vio_errno(net->vio));
|
|
#endif /* EXTRA_DEBUG */
|
|
len= packet_error;
|
|
net->error= 2; /* Close socket */
|
|
net->report_error= 1;
|
|
#ifdef MYSQL_SERVER
|
|
net->last_errno= ER_NET_FCNTL_ERROR;
|
|
#endif
|
|
goto end;
|
|
}
|
|
retry_count=0;
|
|
continue;
|
|
}
|
|
}
|
|
#endif /* (!defined(__WIN__) || 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;
|
|
#ifdef EXTRA_DEBUG
|
|
fprintf(stderr, "%s: read looped with error %d, aborting thread\n",
|
|
my_progname,vio_errno(net->vio));
|
|
#endif /* EXTRA_DEBUG */
|
|
}
|
|
#if defined(THREAD_SAFE_CLIENT) && !defined(MYSQL_SERVER)
|
|
if (vio_errno(net->vio) == SOCKET_EINTR)
|
|
{
|
|
DBUG_PRINT("warning",("Interrupted read. Retrying..."));
|
|
continue;
|
|
}
|
|
#endif
|
|
DBUG_PRINT("error",("Couldn't read packet: remain: %u errno: %d length: %ld",
|
|
remain, vio_errno(net->vio), length));
|
|
len= packet_error;
|
|
net->error= 2; /* Close socket */
|
|
net->report_error= 1;
|
|
#ifdef MYSQL_SERVER
|
|
net->last_errno= (vio_was_interrupted(net->vio) ? ER_NET_READ_INTERRUPTED :
|
|
ER_NET_READ_ERROR);
|
|
#endif
|
|
goto end;
|
|
}
|
|
remain -= (uint32) length;
|
|
pos+= (ulong) length;
|
|
update_statistics(thd_increment_bytes_received(length));
|
|
}
|
|
if (i == 0)
|
|
{ /* First parts is packet length */
|
|
ulong helping;
|
|
DBUG_DUMP("packet_header",(char*) net->buff+net->where_b,
|
|
NET_HEADER_SIZE);
|
|
if (net->buff[net->where_b + 3] != (uchar) net->pkt_nr)
|
|
{
|
|
if (net->buff[net->where_b] != (uchar) 255)
|
|
{
|
|
DBUG_PRINT("error",
|
|
("Packets out of order (Found: %d, expected %u)",
|
|
(int) net->buff[net->where_b + 3],
|
|
net->pkt_nr));
|
|
#ifdef EXTRA_DEBUG
|
|
fflush(stdout);
|
|
fprintf(stderr,"Error: Packets out of order (Found: %d, expected %d)\n",
|
|
(int) net->buff[net->where_b + 3],
|
|
(uint) (uchar) net->pkt_nr);
|
|
fflush(stderr);
|
|
DBUG_ASSERT(0);
|
|
#endif
|
|
}
|
|
len= packet_error;
|
|
net->report_error= 1;
|
|
#ifdef MYSQL_SERVER
|
|
net->last_errno=ER_NET_PACKETS_OUT_OF_ORDER;
|
|
#endif
|
|
goto end;
|
|
}
|
|
net->compress_pkt_nr= ++net->pkt_nr;
|
|
#ifdef HAVE_COMPRESS
|
|
if (net->compress)
|
|
{
|
|
/*
|
|
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 = 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;
|
|
}
|
|
}
|
|
|
|
end:
|
|
if (thr_alarm_in_use(&alarmed))
|
|
{
|
|
my_bool old_mode;
|
|
thr_end_alarm(&alarmed);
|
|
vio_blocking(net->vio, net_blocking, &old_mode);
|
|
}
|
|
net->reading_or_writing=0;
|
|
#ifdef DEBUG_DATA_PACKETS
|
|
if (len != packet_error)
|
|
DBUG_DUMP("data",(char*) net->buff+net->where_b, len);
|
|
#endif
|
|
return(len);
|
|
}
|
|
|
|
|
|
/*
|
|
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.
|
|
|
|
The function returns the length of the found packet or packet_error.
|
|
net->read_pos points to the read data.
|
|
*/
|
|
|
|
ulong
|
|
my_net_read(NET *net)
|
|
{
|
|
ulong len,complen;
|
|
|
|
#ifdef HAVE_COMPRESS
|
|
if (!net->compress)
|
|
{
|
|
#endif
|
|
len = my_real_read(net,&complen);
|
|
if (len == MAX_PACKET_LENGTH)
|
|
{
|
|
/* First packet of a multi-packet. Concatenate the packets */
|
|
ulong save_pos = net->where_b;
|
|
ulong total_length=0;
|
|
do
|
|
{
|
|
net->where_b += len;
|
|
total_length += len;
|
|
len = my_real_read(net,&complen);
|
|
} while (len == MAX_PACKET_LENGTH);
|
|
if (len != packet_error)
|
|
len+= total_length;
|
|
net->where_b = save_pos;
|
|
}
|
|
net->read_pos = net->buff + net->where_b;
|
|
if (len != packet_error)
|
|
net->read_pos[len]=0; /* Safeguard for mysql_use_result */
|
|
return 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)) == packet_error)
|
|
return packet_error;
|
|
if (my_uncompress((byte*) net->buff + net->where_b, &packet_len,
|
|
&complen))
|
|
{
|
|
net->error= 2; /* caller will close socket */
|
|
net->report_error= 1;
|
|
#ifdef MYSQL_SERVER
|
|
net->last_errno=ER_NET_UNCOMPRESS_ERROR;
|
|
#endif
|
|
return packet_error;
|
|
}
|
|
buf_length+=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 */
|
|
return len;
|
|
}
|
|
|
|
|
|
void net_set_read_timeout(NET *net, uint timeout)
|
|
{
|
|
DBUG_ENTER("net_set_read_timeout");
|
|
DBUG_PRINT("enter", ("timeout: %d", timeout));
|
|
net->read_timeout= timeout;
|
|
#ifdef NO_ALARM
|
|
vio_timeout(net->vio, 0, timeout);
|
|
#endif
|
|
DBUG_VOID_RETURN;
|
|
}
|
|
|
|
|
|
void net_set_write_timeout(NET *net, uint timeout)
|
|
{
|
|
DBUG_ENTER("net_set_write_timeout");
|
|
DBUG_PRINT("enter", ("timeout: %d", timeout));
|
|
net->write_timeout= timeout;
|
|
#ifdef NO_ALARM
|
|
vio_timeout(net->vio, 1, timeout);
|
|
#endif
|
|
DBUG_VOID_RETURN;
|
|
}
|