« back to all changes in this revision
Viewing changes to plugin/mysql_protocol/net_serv.cc
- browse files at revision 971.7.10
- compare with another revision
- compare with revision 971.1.39
- download diff
- download tarball
- view history from revision 971.7.10
- Committer: Eric Day
- Date: 2009-11-10 21:50:22 UTC
- mto: This revision was merged to the branch mainline in revision 1218.
- Revision ID: eday@oddments.org-20091110215022-0b2nqmurv7b2l6wo
Duplicated oldlibdrizzle module, one for Drizzle protocol and one for MySQL, per Brian's request from merge proposal. Port options are now --drizzle-protocol-port and --mysql-protocol-port.
- files added:
- plugin/mysql_protocol
- files renamed:
- plugin/oldlibdrizzle/ => plugin/drizzle_protocol/
- files modified:
- plugin/drizzle_protocol/oldlibdrizzle.cc
added
removed
plugin/mysql_protocol/net_serv.cc
1
/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3
*
4
* Copyright (C) 2008 Sun Microsystems, Inc.
5
*
6
* This program is free software; you can redistribute it and/or modify
7
* it under the terms of the GNU General Public License as published by
8
* the Free Software Foundation; either version 2 of the License, or
9
* (at your option) any later version.
10
*
11
* This program is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14
* GNU General Public License for more details.
15
*
16
* You should have received a copy of the GNU General Public License
17
* along with this program; if not, write to the Free Software
18
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19
*/
20
21
#include <drizzled/global.h>
22
#include <drizzled/session.h>
23
24
#include <assert.h>
25
#include <stdio.h>
26
#include <stdlib.h>
27
#include <string.h>
28
#include <signal.h>
29
#include <errno.h>
30
#include <sys/socket.h>
31
#include <sys/poll.h>
32
#include <zlib.h>
33
#include <algorithm>
34
35
#include "errmsg.h"
36
#include "vio.h"
37
#include "net_serv.h"
38
39
using namespace std;
40
41
/*
42
The following handles the differences when this is linked between the
43
client and the server.
44
45
This gives an error if a too big packet is found
46
The server can change this with the -O switch, but because the client
47
can't normally do this the client should have a bigger max_allowed_packet.
48
*/
49
50
51
#define MAX_PACKET_LENGTH (256L*256L*256L-1)
52
const char *not_error_sqlstate= "00000";
53
54
static bool net_write_buff(NET *net, const unsigned char *packet, uint32_t len);
55
static int drizzleclient_net_real_write(NET *net, const unsigned char *packet, size_t len);
56
57
/** Init with packet info. */
58
59
bool drizzleclient_net_init(NET *net, Vio* vio, uint32_t buffer_length)
60
{
61
net->vio = vio;
62
net->max_packet= (uint32_t) buffer_length;
63
net->max_packet_size= max(buffer_length, global_system_variables.max_allowed_packet);
64
65
if (!(net->buff=(unsigned char*) malloc((size_t) net->max_packet+
66
NET_HEADER_SIZE + COMP_HEADER_SIZE)))
67
return(1);
68
net->buff_end=net->buff+net->max_packet;
69
net->error=0; net->return_status=0;
70
net->pkt_nr=net->compress_pkt_nr=0;
71
net->write_pos=net->read_pos = net->buff;
72
net->last_error[0]=0;
73
net->compress=0; net->reading_or_writing=0;
74
net->where_b = net->remain_in_buf=0;
75
net->last_errno=0;
76
net->unused= 0;
77
78
if (vio != 0) /* If real connection */
79
{
80
net->fd = drizzleclient_vio_fd(vio); /* For perl DBI/DBD */
81
drizzleclient_vio_fastsend(vio);
82
}
83
return(0);
84
}
85
86
bool drizzleclient_net_init_sock(NET * net, int sock, int flags,
87
uint32_t buffer_length)
88
{
89
90
Vio *drizzleclient_vio_tmp= drizzleclient_vio_new(sock, VIO_TYPE_TCPIP, flags);
91
if (drizzleclient_vio_tmp == NULL)
92
return true;
93
else
94
if (drizzleclient_net_init(net, drizzleclient_vio_tmp, buffer_length))
95
{
96
/* Only delete the temporary vio if we didn't already attach it to the
97
* NET object.
98
*/
99
if (drizzleclient_vio_tmp && (net->vio != drizzleclient_vio_tmp))
100
drizzleclient_vio_delete(drizzleclient_vio_tmp);
101
else
102
{
103
(void) shutdown(sock, SHUT_RDWR);
104
(void) close(sock);
105
}
106
return true;
107
}
108
return false;
109
}
110
111
void drizzleclient_net_end(NET *net)
112
{
113
if (net->buff != NULL)
114
free(net->buff);
115
net->buff= NULL;
116
return;
117
}
118
119
void drizzleclient_net_close(NET *net)
120
{
121
if (net->vio != NULL)
122
{
123
drizzleclient_vio_delete(net->vio);
124
net->vio= 0;
125
}
126
}
127
128
bool drizzleclient_net_peer_addr(NET *net, char *buf, uint16_t *port, size_t buflen)
129
{
130
return drizzleclient_vio_peer_addr(net->vio, buf, port, buflen);
131
}
132
133
void drizzleclient_net_keepalive(NET *net, bool flag)
134
{
135
drizzleclient_vio_keepalive(net->vio, flag);
136
}
137
138
int drizzleclient_net_get_sd(NET *net)
139
{
140
return net->vio->sd;
141
}
142
143
bool drizzleclient_net_more_data(NET *net)
144
{
145
return (net->vio == 0 || net->vio->read_pos < net->vio->read_end);
146
}
147
148
/** Realloc the packet buffer. */
149
150
static bool drizzleclient_net_realloc(NET *net, size_t length)
151
{
152
unsigned char *buff;
153
size_t pkt_length;
154
155
if (length >= net->max_packet_size)
156
{
157
/* @todo: 1 and 2 codes are identical. */
158
net->error= 1;
159
net->last_errno= CR_NET_PACKET_TOO_LARGE;
160
return(1);
161
}
162
pkt_length = (length+IO_SIZE-1) & ~(IO_SIZE-1);
163
/*
164
We must allocate some extra bytes for the end 0 and to be able to
165
read big compressed blocks
166
*/
167
if (!(buff= (unsigned char*) realloc((char*) net->buff, pkt_length +
168
NET_HEADER_SIZE + COMP_HEADER_SIZE)))
169
{
170
/* @todo: 1 and 2 codes are identical. */
171
net->error= 1;
172
net->last_errno= CR_OUT_OF_MEMORY;
173
/* In the server the error is reported by MY_WME flag. */
174
return(1);
175
}
176
net->buff=net->write_pos=buff;
177
net->buff_end=buff+(net->max_packet= (uint32_t) pkt_length);
178
return(0);
179
}
180
181
182
/**
183
Check if there is any data to be read from the socket.
184
185
@param sd socket descriptor
186
187
@retval
188
0 No data to read
189
@retval
190
1 Data or EOF to read
191
@retval
192
-1 Don't know if data is ready or not
193
*/
194
195
static bool net_data_is_ready(int sd)
196
{
197
struct pollfd ufds;
198
int res;
199
200
ufds.fd= sd;
201
ufds.events= POLLIN | POLLPRI;
202
if (!(res= poll(&ufds, 1, 0)))
203
return 0;
204
if (res < 0 || !(ufds.revents & (POLLIN | POLLPRI)))
205
return 0;
206
return 1;
207
}
208
209
/**
210
Remove unwanted characters from connection
211
and check if disconnected.
212
213
Read from socket until there is nothing more to read. Discard
214
what is read.
215
216
If there is anything when to read 'drizzleclient_net_clear' is called this
217
normally indicates an error in the protocol.
218
219
When connection is properly closed (for TCP it means with
220
a FIN packet), then select() considers a socket "ready to read",
221
in the sense that there's EOF to read, but read() returns 0.
222
223
@param net NET handler
224
@param clear_buffer if <> 0, then clear all data from comm buff
225
*/
226
227
void drizzleclient_net_clear(NET *net, bool clear_buffer)
228
{
229
if (clear_buffer)
230
{
231
while (net_data_is_ready(net->vio->sd) > 0)
232
{
233
/* The socket is ready */
234
if (drizzleclient_vio_read(net->vio, net->buff,
235
(size_t) net->max_packet) <= 0)
236
{
237
net->error= 2;
238
break;
239
}
240
}
241
}
242
net->pkt_nr=net->compress_pkt_nr=0; /* Ready for new command */
243
net->write_pos=net->buff;
244
return;
245
}
246
247
248
/** Flush write_buffer if not empty. */
249
250
bool drizzleclient_net_flush(NET *net)
251
{
252
bool error= 0;
253
if (net->buff != net->write_pos)
254
{
255
error=drizzleclient_net_real_write(net, net->buff,
256
(size_t) (net->write_pos - net->buff)) ? 1 : 0;
257
net->write_pos=net->buff;
258
}
259
/* Sync packet number if using compression */
260
if (net->compress)
261
net->pkt_nr=net->compress_pkt_nr;
262
return(error);
263
}
264
265
266
/*****************************************************************************
267
** Write something to server/client buffer
268
*****************************************************************************/
269
270
/**
271
Write a logical packet with packet header.
272
273
Format: Packet length (3 bytes), packet number(1 byte)
274
When compression is used a 3 byte compression length is added
275
276
@note
277
If compression is used the original package is modified!
278
*/
279
280
bool
281
drizzleclient_net_write(NET *net,const unsigned char *packet,size_t len)
282
{
283
unsigned char buff[NET_HEADER_SIZE];
284
if (unlikely(!net->vio)) /* nowhere to write */
285
return 0;
286
/*
287
Big packets are handled by splitting them in packets of MAX_PACKET_LENGTH
288
length. The last packet is always a packet that is < MAX_PACKET_LENGTH.
289
(The last packet may even have a length of 0)
290
*/
291
while (len >= MAX_PACKET_LENGTH)
292
{
293
const uint32_t z_size = MAX_PACKET_LENGTH;
294
int3store(buff, z_size);
295
buff[3]= (unsigned char) net->pkt_nr++;
296
if (net_write_buff(net, buff, NET_HEADER_SIZE) ||
297
net_write_buff(net, packet, z_size))
298
return 1;
299
packet += z_size;
300
len-= z_size;
301
}
302
/* Write last packet */
303
int3store(buff,len);
304
buff[3]= (unsigned char) net->pkt_nr++;
305
if (net_write_buff(net, buff, NET_HEADER_SIZE))
306
return 1;
307
return net_write_buff(net,packet,len) ? 1 : 0;
308
}
309
310
/**
311
Send a command to the server.
312
313
The reason for having both header and packet is so that libdrizzle
314
can easy add a header to a special command (like prepared statements)
315
without having to re-alloc the string.
316
317
As the command is part of the first data packet, we have to do some data
318
juggling to put the command in there, without having to create a new
319
packet.
320
321
This function will split big packets into sub-packets if needed.
322
(Each sub packet can only be 2^24 bytes)
323
324
@param net NET handler
325
@param command Command in MySQL server (enum enum_server_command)
326
@param header Header to write after command
327
@param head_len Length of header
328
@param packet Query or parameter to query
329
@param len Length of packet
330
331
@retval
332
0 ok
333
@retval
334
1 error
335
*/
336
337
bool
338
drizzleclient_net_write_command(NET *net,unsigned char command,
339
const unsigned char *header, size_t head_len,
340
const unsigned char *packet, size_t len)
341
{
342
uint32_t length=len+1+head_len; /* 1 extra byte for command */
343
unsigned char buff[NET_HEADER_SIZE+1];
344
uint32_t header_size=NET_HEADER_SIZE+1;
345
346
buff[4]=command; /* For first packet */
347
348
if (length >= MAX_PACKET_LENGTH)
349
{
350
/* Take into account that we have the command in the first header */
351
len= MAX_PACKET_LENGTH - 1 - head_len;
352
do
353
{
354
int3store(buff, MAX_PACKET_LENGTH);
355
buff[3]= (unsigned char) net->pkt_nr++;
356
if (net_write_buff(net, buff, header_size) ||
357
net_write_buff(net, header, head_len) ||
358
net_write_buff(net, packet, len))
359
return(1);
360
packet+= len;
361
length-= MAX_PACKET_LENGTH;
362
len= MAX_PACKET_LENGTH;
363
head_len= 0;
364
header_size= NET_HEADER_SIZE;
365
} while (length >= MAX_PACKET_LENGTH);
366
len=length; /* Data left to be written */
367
}
368
int3store(buff,length);
369
buff[3]= (unsigned char) net->pkt_nr++;
370
return((net_write_buff(net, buff, header_size) ||
371
(head_len && net_write_buff(net, header, head_len)) ||
372
net_write_buff(net, packet, len) || drizzleclient_net_flush(net)) ? 1 : 0 );
373
}
374
375
/**
376
Caching the data in a local buffer before sending it.
377
378
Fill up net->buffer and send it to the client when full.
379
380
If the rest of the to-be-sent-packet is bigger than buffer,
381
send it in one big block (to avoid copying to internal buffer).
382
If not, copy the rest of the data to the buffer and return without
383
sending data.
384
385
@param net Network handler
386
@param packet Packet to send
387
@param len Length of packet
388
389
@note
390
The cached buffer can be sent as it is with 'drizzleclient_net_flush()'.
391
In this code we have to be careful to not send a packet longer than
392
MAX_PACKET_LENGTH to drizzleclient_net_real_write() if we are using the compressed
393
protocol as we store the length of the compressed packet in 3 bytes.
394
395
@retval
396
0 ok
397
@retval
398
1
399
*/
400
401
static bool
402
net_write_buff(NET *net, const unsigned char *packet, uint32_t len)
403
{
404
uint32_t left_length;
405
if (net->compress && net->max_packet > MAX_PACKET_LENGTH)
406
left_length= MAX_PACKET_LENGTH - (net->write_pos - net->buff);
407
else
408
left_length= (uint32_t) (net->buff_end - net->write_pos);
409
410
if (len > left_length)
411
{
412
if (net->write_pos != net->buff)
413
{
414
/* Fill up already used packet and write it */
415
memcpy(net->write_pos,packet,left_length);
416
if (drizzleclient_net_real_write(net, net->buff,
417
(size_t) (net->write_pos - net->buff) + left_length))
418
return 1;
419
net->write_pos= net->buff;
420
packet+= left_length;
421
len-= left_length;
422
}
423
if (net->compress)
424
{
425
/*
426
We can't have bigger packets than 16M with compression
427
Because the uncompressed length is stored in 3 bytes
428
*/
429
left_length= MAX_PACKET_LENGTH;
430
while (len > left_length)
431
{
432
if (drizzleclient_net_real_write(net, packet, left_length))
433
return 1;
434
packet+= left_length;
435
len-= left_length;
436
}
437
}
438
if (len > net->max_packet)
439
return drizzleclient_net_real_write(net, packet, len) ? 1 : 0;
440
/* Send out rest of the blocks as full sized blocks */
441
}
442
memcpy(net->write_pos,packet,len);
443
net->write_pos+= len;
444
return 0;
445
}
446
447
448
/**
449
Read and write one packet using timeouts.
450
If needed, the packet is compressed before sending.
451
452
@todo
453
- TODO is it needed to set this variable if we have no socket
454
*/
455
456
/*
457
TODO: rewrite this in a manner to do non-block writes. If a write can not be made, and we are
458
in the server, yield to another process and come back later.
459
*/
460
static int
461
drizzleclient_net_real_write(NET *net, const unsigned char *packet, size_t len)
462
{
463
size_t length;
464
const unsigned char *pos, *end;
465
uint32_t retry_count= 0;
466
467
/* Backup of the original SO_RCVTIMEO timeout */
468
469
if (net->error == 2)
470
return(-1); /* socket can't be used */
471
472
net->reading_or_writing=2;
473
if (net->compress)
474
{
475
size_t complen;
476
unsigned char *b;
477
const uint32_t header_length=NET_HEADER_SIZE+COMP_HEADER_SIZE;
478
if (!(b= (unsigned char*) malloc(len + NET_HEADER_SIZE +
479
COMP_HEADER_SIZE)))
480
{
481
net->error= 2;
482
net->last_errno= CR_OUT_OF_MEMORY;
483
/* In the server, the error is reported by MY_WME flag. */
484
net->reading_or_writing= 0;
485
return(1);
486
}
487
memcpy(b+header_length,packet,len);
488
489
complen= len * 120 / 100 + 12;
490
unsigned char * compbuf= (unsigned char *) malloc(complen);
491
if (compbuf != NULL)
492
{
493
uLongf tmp_complen= complen;
494
int res= compress((Bytef*) compbuf, &tmp_complen,
495
(Bytef*) (b+header_length),
496
len);
497
complen= tmp_complen;
498
499
free(compbuf);
500
501
if ((res != Z_OK) || (complen >= len))
502
complen= 0;
503
else
504
{
505
size_t tmplen= complen;
506
complen= len;
507
len= tmplen;
508
}
509
}
510
else
511
{
512
complen=0;
513
}
514
int3store(&b[NET_HEADER_SIZE],complen);
515
int3store(b,len);
516
b[3]=(unsigned char) (net->compress_pkt_nr++);
517
len+= header_length;
518
packet= b;
519
}
520
521
pos= packet;
522
end=pos+len;
523
/* Loop until we have read everything */
524
while (pos != end)
525
{
526
assert(pos);
527
if ((long) (length= drizzleclient_vio_write(net->vio, pos, (size_t) (end-pos))) <= 0)
528
{
529
/*
530
* We could end up here with net->vio == NULL
531
* See LP bug#436685
532
* If that is the case, we exit the while loop
533
*/
534
if (net->vio == NULL)
535
break;
536
537
const bool interrupted= drizzleclient_vio_should_retry(net->vio);
538
/*
539
If we read 0, or we were interrupted this means that
540
we need to switch to blocking mode and wait until the timeout
541
on the socket kicks in.
542
*/
543
if ((interrupted || length == 0))
544
{
545
bool old_mode;
546
547
while (drizzleclient_vio_blocking(net->vio, true, &old_mode) < 0)
548
{
549
if (drizzleclient_vio_should_retry(net->vio) && retry_count++ < net->retry_count)
550
continue;
551
net->error= 2; /* Close socket */
552
net->last_errno= CR_NET_PACKET_TOO_LARGE;
553
goto end;
554
}
555
retry_count=0;
556
continue;
557
}
558
else
559
{
560
if (retry_count++ < net->retry_count)
561
continue;
562
}
563
564
if (drizzleclient_vio_errno(net->vio) == EINTR)
565
{
566
continue;
567
}
568
net->error= 2; /* Close socket */
569
net->last_errno= (interrupted ? CR_NET_WRITE_INTERRUPTED :
570
CR_NET_ERROR_ON_WRITE);
571
break;
572
}
573
pos+=length;
574
}
575
end:
576
if ((net->compress) && (packet != NULL))
577
free((char*) packet);
578
net->reading_or_writing=0;
579
580
return(((int) (pos != end)));
581
}
582
583
584
/**
585
Reads one packet to net->buff + net->where_b.
586
Long packets are handled by drizzleclient_net_read().
587
This function reallocates the net->buff buffer if necessary.
588
589
@return
590
Returns length of packet.
591
*/
592
593
static uint32_t
594
my_real_read(NET *net, size_t *complen)
595
{
596
unsigned char *pos;
597
size_t length;
598
uint32_t i,retry_count=0;
599
size_t len=packet_error;
600
uint32_t remain= (net->compress ? NET_HEADER_SIZE+COMP_HEADER_SIZE :
601
NET_HEADER_SIZE);
602
603
*complen = 0;
604
605
net->reading_or_writing= 1;
606
/* Read timeout is set in drizzleclient_net_set_read_timeout */
607
608
pos = net->buff + net->where_b; /* net->packet -4 */
609
610
for (i= 0; i < 2 ; i++)
611
{
612
while (remain > 0)
613
{
614
/* First read is done with non blocking mode */
615
if ((long) (length= drizzleclient_vio_read(net->vio, pos, remain)) <= 0L)
616
{
617
if (net->vio == NULL)
618
goto end;
619
620
const bool interrupted = drizzleclient_vio_should_retry(net->vio);
621
622
if (interrupted)
623
{ /* Probably in MIT threads */
624
if (retry_count++ < net->retry_count)
625
continue;
626
}
627
if (drizzleclient_vio_errno(net->vio) == EINTR)
628
{
629
continue;
630
}
631
len= packet_error;
632
net->error= 2; /* Close socket */
633
net->last_errno= (drizzleclient_vio_was_interrupted(net->vio) ?
634
CR_NET_READ_INTERRUPTED :
635
CR_NET_READ_ERROR);
636
ER(net->last_errno);
637
goto end;
638
}
639
remain -= (uint32_t) length;
640
pos+= length;
641
}
642
if (i == 0)
643
{ /* First parts is packet length */
644
uint32_t helping;
645
646
if (net->buff[net->where_b + 3] != (unsigned char) net->pkt_nr)
647
{
648
len= packet_error;
649
/* Not a NET error on the client. XXX: why? */
650
goto end;
651
}
652
net->compress_pkt_nr= ++net->pkt_nr;
653
if (net->compress)
654
{
655
/*
656
If the packet is compressed then complen > 0 and contains the
657
number of bytes in the uncompressed packet
658
*/
659
*complen=uint3korr(&(net->buff[net->where_b + NET_HEADER_SIZE]));
660
}
661
662
len=uint3korr(net->buff+net->where_b);
663
if (!len) /* End of big multi-packet */
664
goto end;
665
helping = max(len,*complen) + net->where_b;
666
/* The necessary size of net->buff */
667
if (helping >= net->max_packet)
668
{
669
if (drizzleclient_net_realloc(net,helping))
670
{
671
len= packet_error; /* Return error and close connection */
672
goto end;
673
}
674
}
675
pos=net->buff + net->where_b;
676
remain = (uint32_t) len;
677
}
678
}
679
680
end:
681
net->reading_or_writing= 0;
682
683
return(len);
684
}
685
686
687
/**
688
Read a packet from the client/server and return it without the internal
689
package header.
690
691
If the packet is the first packet of a multi-packet packet
692
(which is indicated by the length of the packet = 0xffffff) then
693
all sub packets are read and concatenated.
694
695
If the packet was compressed, its uncompressed and the length of the
696
uncompressed packet is returned.
697
698
@return
699
The function returns the length of the found packet or packet_error.
700
net->read_pos points to the read data.
701
*/
702
703
uint32_t
704
drizzleclient_net_read(NET *net)
705
{
706
size_t len, complen;
707
708
if (!net->compress)
709
{
710
len = my_real_read(net,&complen);
711
if (len == MAX_PACKET_LENGTH)
712
{
713
/* First packet of a multi-packet. Concatenate the packets */
714
uint32_t save_pos = net->where_b;
715
size_t total_length= 0;
716
do
717
{
718
net->where_b += len;
719
total_length += len;
720
len = my_real_read(net,&complen);
721
} while (len == MAX_PACKET_LENGTH);
722
if (len != packet_error)
723
len+= total_length;
724
net->where_b = save_pos;
725
}
726
net->read_pos = net->buff + net->where_b;
727
if (len != packet_error)
728
net->read_pos[len]=0; /* Safeguard for drizzleclient_use_result */
729
return len;
730
}
731
else
732
{
733
/* We are using the compressed protocol */
734
735
uint32_t buf_length;
736
uint32_t start_of_packet;
737
uint32_t first_packet_offset;
738
uint32_t read_length, multi_byte_packet=0;
739
740
if (net->remain_in_buf)
741
{
742
buf_length= net->buf_length; /* Data left in old packet */
743
first_packet_offset= start_of_packet= (net->buf_length -
744
net->remain_in_buf);
745
/* Restore the character that was overwritten by the end 0 */
746
net->buff[start_of_packet]= net->save_char;
747
}
748
else
749
{
750
/* reuse buffer, as there is nothing in it that we need */
751
buf_length= start_of_packet= first_packet_offset= 0;
752
}
753
for (;;)
754
{
755
uint32_t packet_len;
756
757
if (buf_length - start_of_packet >= NET_HEADER_SIZE)
758
{
759
read_length = uint3korr(net->buff+start_of_packet);
760
if (!read_length)
761
{
762
/* End of multi-byte packet */
763
start_of_packet += NET_HEADER_SIZE;
764
break;
765
}
766
if (read_length + NET_HEADER_SIZE <= buf_length - start_of_packet)
767
{
768
if (multi_byte_packet)
769
{
770
/* Remove packet header for second packet */
771
memmove(net->buff + first_packet_offset + start_of_packet,
772
net->buff + first_packet_offset + start_of_packet +
773
NET_HEADER_SIZE,
774
buf_length - start_of_packet);
775
start_of_packet += read_length;
776
buf_length -= NET_HEADER_SIZE;
777
}
778
else
779
start_of_packet+= read_length + NET_HEADER_SIZE;
780
781
if (read_length != MAX_PACKET_LENGTH) /* last package */
782
{
783
multi_byte_packet= 0; /* No last zero len packet */
784
break;
785
}
786
multi_byte_packet= NET_HEADER_SIZE;
787
/* Move data down to read next data packet after current one */
788
if (first_packet_offset)
789
{
790
memmove(net->buff,net->buff+first_packet_offset,
791
buf_length-first_packet_offset);
792
buf_length-=first_packet_offset;
793
start_of_packet -= first_packet_offset;
794
first_packet_offset=0;
795
}
796
continue;
797
}
798
}
799
/* Move data down to read next data packet after current one */
800
if (first_packet_offset)
801
{
802
memmove(net->buff,net->buff+first_packet_offset,
803
buf_length-first_packet_offset);
804
buf_length-=first_packet_offset;
805
start_of_packet -= first_packet_offset;
806
first_packet_offset=0;
807
}
808
809
net->where_b=buf_length;
810
if ((packet_len = my_real_read(net,&complen)) == packet_error)
811
return packet_error;
812
813
if (complen)
814
{
815
unsigned char * compbuf= (unsigned char *) malloc(complen);
816
if (compbuf != NULL)
817
{
818
uLongf tmp_complen= complen;
819
int error= uncompress((Bytef*) compbuf, &tmp_complen,
820
(Bytef*) (net->buff + net->where_b),
821
(uLong)packet_len);
822
complen= tmp_complen;
823
824
if (error != Z_OK)
825
{
826
net->error= 2; /* caller will close socket */
827
net->last_errno= CR_NET_UNCOMPRESS_ERROR;
828
}
829
else
830
{
831
memcpy((net->buff + net->where_b), compbuf, complen);
832
}
833
free(compbuf);
834
}
835
}
836
else
837
complen= packet_len;
838
839
}
840
buf_length+= complen;
841
842
net->read_pos= net->buff+ first_packet_offset + NET_HEADER_SIZE;
843
net->buf_length= buf_length;
844
net->remain_in_buf= (uint32_t) (buf_length - start_of_packet);
845
len = ((uint32_t) (start_of_packet - first_packet_offset) - NET_HEADER_SIZE -
846
multi_byte_packet);
847
net->save_char= net->read_pos[len]; /* Must be saved */
848
net->read_pos[len]=0; /* Safeguard for drizzleclient_use_result */
849
}
850
return len;
851
}
852
853
854
void drizzleclient_net_set_read_timeout(NET *net, uint32_t timeout)
855
{
856
net->read_timeout= timeout;
857
#ifndef __sun
858
if (net->vio)
859
drizzleclient_vio_timeout(net->vio, 0, timeout);
860
#endif
861
return;
862
}
863
864
865
void drizzleclient_net_set_write_timeout(NET *net, uint32_t timeout)
866
{
867
net->write_timeout= timeout;
868
#ifndef __sun
869
if (net->vio)
870
drizzleclient_vio_timeout(net->vio, 1, timeout);
871
#endif
872
return;
873
}
874
/**
875
Clear possible error state of struct NET
876
877
@param net clear the state of the argument
878
*/
879
880
void drizzleclient_drizzleclient_net_clear_error(NET *net)
881
{
882
net->last_errno= 0;
883
net->last_error[0]= '\0';
884
strcpy(net->sqlstate, not_error_sqlstate);
885
}
886
Loggerhead is a web-based interface for Breezy
Version: 2.0.1