-
Notifications
You must be signed in to change notification settings - Fork 0
/
io.c
1917 lines (1689 loc) · 44.4 KB
/
io.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Socket and pipe I/O utilities used in rsync.
*
* Copyright (C) 1996-2001 Andrew Tridgell
* Copyright (C) 1996 Paul Mackerras
* Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
* Copyright (C) 2003-2009 Wayne Davison
*
* 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; either version 3 of the License, or
* (at your option) any later version.
*
* 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, visit the http://fsf.org website.
*/
/* Rsync provides its own multiplexing system, which is used to send
* stderr and stdout over a single socket.
*
* For historical reasons this is off during the start of the
* connection, but it's switched on quite early using
* io_start_multiplex_out() and io_start_multiplex_in(). */
#include "rsync.h"
#include "ifuncs.h"
/** If no timeout is specified then use a 60 second select timeout */
#define SELECT_TIMEOUT 60
extern int bwlimit;
extern size_t bwlimit_writemax;
extern int io_timeout;
extern int am_server;
extern int am_daemon;
extern int am_sender;
extern int am_generator;
extern int inc_recurse;
extern int io_error;
extern int eol_nulls;
extern int flist_eof;
extern int list_only;
extern int read_batch;
extern int compat_flags;
extern int protect_args;
extern int checksum_seed;
extern int protocol_version;
extern int remove_source_files;
extern int preserve_hard_links;
extern struct stats stats;
extern struct file_list *cur_flist;
#ifdef ICONV_OPTION
extern int filesfrom_convert;
extern iconv_t ic_send, ic_recv;
#endif
int csum_length = SHORT_SUM_LENGTH; /* initial value */
int allowed_lull = 0;
int ignore_timeout = 0;
int batch_fd = -1;
int msgdone_cnt = 0;
/* Ignore an EOF error if non-zero. See whine_about_eof(). */
int kluge_around_eof = 0;
int msg_fd_in = -1;
int msg_fd_out = -1;
int sock_f_in = -1;
int sock_f_out = -1;
static int iobuf_f_in = -1;
static char *iobuf_in;
static size_t iobuf_in_siz;
static size_t iobuf_in_ndx;
static size_t iobuf_in_remaining;
static int iobuf_f_out = -1;
static char *iobuf_out;
static int iobuf_out_cnt;
int flist_forward_from = -1;
static int io_multiplexing_out;
static int io_multiplexing_in;
static time_t last_io_in;
static time_t last_io_out;
static int no_flush;
static int write_batch_monitor_in = -1;
static int write_batch_monitor_out = -1;
static int io_filesfrom_f_in = -1;
static int io_filesfrom_f_out = -1;
static xbuf ff_buf = EMPTY_XBUF;
static char ff_lastchar;
#ifdef ICONV_OPTION
static xbuf iconv_buf = EMPTY_XBUF;
#endif
static int defer_forwarding_messages = 0, keep_defer_forwarding = 0;
static int select_timeout = SELECT_TIMEOUT;
static int active_filecnt = 0;
static OFF_T active_bytecnt = 0;
static int first_message = 1;
static char int_byte_extra[64] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (00 - 3F)/4 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (40 - 7F)/4 */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* (80 - BF)/4 */
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6, /* (C0 - FF)/4 */
};
#define REMOTE_OPTION_ERROR "rsync: on remote machine: -"
#define REMOTE_OPTION_ERROR2 ": unknown option"
enum festatus { FES_SUCCESS, FES_REDO, FES_NO_SEND };
static void check_timeout(void)
{
time_t t, chk;
if (!io_timeout || ignore_timeout)
return;
t = time(NULL);
if (!last_io_in)
last_io_in = t;
chk = MAX(last_io_out, last_io_in);
if (t - chk >= io_timeout) {
if (am_server || am_daemon)
exit_cleanup(RERR_TIMEOUT);
rprintf(FERROR, "[%s] io timeout after %d seconds -- exiting\n",
who_am_i(), (int)(t-chk));
exit_cleanup(RERR_TIMEOUT);
}
}
static void readfd(int fd, char *buffer, size_t N);
static void writefd(int fd, const char *buf, size_t len);
static void writefd_unbuffered(int fd, const char *buf, size_t len);
static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert);
static flist_ndx_list redo_list, hlink_list;
struct msg_list_item {
struct msg_list_item *next;
char convert;
char buf[1];
};
struct msg_list {
struct msg_list_item *head, *tail;
};
static struct msg_list msg_queue;
static void got_flist_entry_status(enum festatus status, const char *buf)
{
int ndx = IVAL(buf, 0);
struct file_list *flist = flist_for_ndx(ndx, "got_flist_entry_status");
if (remove_source_files) {
active_filecnt--;
active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]);
}
if (inc_recurse)
flist->in_progress--;
switch (status) {
case FES_SUCCESS:
if (remove_source_files)
send_msg(MSG_SUCCESS, buf, 4, 0);
if (preserve_hard_links) {
struct file_struct *file = flist->files[ndx - flist->ndx_start];
if (F_IS_HLINKED(file)) {
flist_ndx_push(&hlink_list, ndx);
flist->in_progress++;
}
}
break;
case FES_REDO:
if (read_batch) {
if (inc_recurse)
flist->in_progress++;
break;
}
if (inc_recurse)
flist->to_redo++;
flist_ndx_push(&redo_list, ndx);
break;
case FES_NO_SEND:
break;
}
}
/* Note the fds used for the main socket (which might really be a pipe
* for a local transfer, but we can ignore that). */
void io_set_sock_fds(int f_in, int f_out)
{
sock_f_in = f_in;
sock_f_out = f_out;
}
void set_io_timeout(int secs)
{
io_timeout = secs;
allowed_lull = (io_timeout + 1) / 2;
if (!io_timeout || allowed_lull > SELECT_TIMEOUT)
select_timeout = SELECT_TIMEOUT;
else
select_timeout = allowed_lull;
if (read_batch)
allowed_lull = 0;
}
/* Setup the fd used to receive MSG_* messages. Only needed during the
* early stages of being a local sender (up through the sending of the
* file list) or when we're the generator (to fetch the messages from
* the receiver). */
void set_msg_fd_in(int fd)
{
msg_fd_in = fd;
}
/* Setup the fd used to send our MSG_* messages. Only needed when
* we're the receiver (to send our messages to the generator). */
void set_msg_fd_out(int fd)
{
msg_fd_out = fd;
set_nonblocking(msg_fd_out);
}
/* Add a message to the pending MSG_* list. */
static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len, int convert)
{
struct msg_list_item *m;
int sz = len + 4 + sizeof m[0] - 1;
if (!(m = (struct msg_list_item *)new_array(char, sz)))
out_of_memory("msg_list_add");
m->next = NULL;
m->convert = convert;
SIVAL(m->buf, 0, ((code+MPLEX_BASE)<<24) | len);
memcpy(m->buf + 4, buf, len);
if (lst->tail)
lst->tail->next = m;
else
lst->head = m;
lst->tail = m;
}
static inline int flush_a_msg(int fd)
{
struct msg_list_item *m = msg_queue.head;
int len = IVAL(m->buf, 0) & 0xFFFFFF;
int tag = *((uchar*)m->buf+3) - MPLEX_BASE;
if (!(msg_queue.head = m->next))
msg_queue.tail = NULL;
defer_forwarding_messages++;
mplex_write(fd, tag, m->buf + 4, len, m->convert);
defer_forwarding_messages--;
free(m);
return len;
}
static void msg_flush(void)
{
if (am_generator) {
while (msg_queue.head && io_multiplexing_out)
stats.total_written += flush_a_msg(sock_f_out) + 4;
} else {
while (msg_queue.head)
(void)flush_a_msg(msg_fd_out);
}
}
static void check_for_d_option_error(const char *msg)
{
static char rsync263_opts[] = "BCDHIKLPRSTWabceghlnopqrtuvxz";
char *colon;
int saw_d = 0;
if (*msg != 'r'
|| strncmp(msg, REMOTE_OPTION_ERROR, sizeof REMOTE_OPTION_ERROR - 1) != 0)
return;
msg += sizeof REMOTE_OPTION_ERROR - 1;
if (*msg == '-' || (colon = strchr(msg, ':')) == NULL
|| strncmp(colon, REMOTE_OPTION_ERROR2, sizeof REMOTE_OPTION_ERROR2 - 1) != 0)
return;
for ( ; *msg != ':'; msg++) {
if (*msg == 'd')
saw_d = 1;
else if (*msg == 'e')
break;
else if (strchr(rsync263_opts, *msg) == NULL)
return;
}
if (saw_d) {
rprintf(FWARNING,
"*** Try using \"--old-d\" if remote rsync is <= 2.6.3 ***\n");
}
}
/* Read a message from the MSG_* fd and handle it. This is called either
* during the early stages of being a local sender (up through the sending
* of the file list) or when we're the generator (to fetch the messages
* from the receiver). */
static void read_msg_fd(void)
{
char buf[2048];
size_t n;
struct file_list *flist;
int fd = msg_fd_in;
int tag, len;
/* Temporarily disable msg_fd_in. This is needed to avoid looping back
* to this routine from writefd_unbuffered(). */
no_flush++;
msg_fd_in = -1;
defer_forwarding_messages++;
readfd(fd, buf, 4);
tag = IVAL(buf, 0);
len = tag & 0xFFFFFF;
tag = (tag >> 24) - MPLEX_BASE;
switch (tag) {
case MSG_DONE:
if (len < 0 || len > 1 || !am_generator) {
invalid_msg:
rprintf(FERROR, "invalid message %d:%d [%s%s]\n",
tag, len, who_am_i(),
inc_recurse ? "/inc" : "");
exit_cleanup(RERR_STREAMIO);
}
if (len) {
readfd(fd, buf, len);
stats.total_read = read_varlong(fd, 3);
}
msgdone_cnt++;
break;
case MSG_REDO:
if (len != 4 || !am_generator)
goto invalid_msg;
readfd(fd, buf, 4);
got_flist_entry_status(FES_REDO, buf);
break;
case MSG_FLIST:
if (len != 4 || !am_generator || !inc_recurse)
goto invalid_msg;
readfd(fd, buf, 4);
/* Read extra file list from receiver. */
assert(iobuf_in != NULL);
assert(iobuf_f_in == fd);
if (verbose > 3) {
rprintf(FINFO, "[%s] receiving flist for dir %d\n",
who_am_i(), IVAL(buf,0));
}
flist = recv_file_list(fd);
flist->parent_ndx = IVAL(buf,0);
#ifdef SUPPORT_HARD_LINKS
if (preserve_hard_links)
match_hard_links(flist);
#endif
break;
case MSG_FLIST_EOF:
if (len != 0 || !am_generator || !inc_recurse)
goto invalid_msg;
flist_eof = 1;
break;
case MSG_IO_ERROR:
if (len != 4)
goto invalid_msg;
readfd(fd, buf, len);
io_error |= IVAL(buf, 0);
break;
case MSG_DELETED:
if (len >= (int)sizeof buf || !am_generator)
goto invalid_msg;
readfd(fd, buf, len);
send_msg(MSG_DELETED, buf, len, 1);
break;
case MSG_SUCCESS:
if (len != 4 || !am_generator)
goto invalid_msg;
readfd(fd, buf, 4);
got_flist_entry_status(FES_SUCCESS, buf);
break;
case MSG_NO_SEND:
if (len != 4 || !am_generator)
goto invalid_msg;
readfd(fd, buf, 4);
got_flist_entry_status(FES_NO_SEND, buf);
break;
case MSG_ERROR_SOCKET:
case MSG_ERROR_UTF8:
case MSG_CLIENT:
if (!am_generator)
goto invalid_msg;
if (tag == MSG_ERROR_SOCKET)
io_end_multiplex_out();
/* FALL THROUGH */
case MSG_INFO:
case MSG_ERROR:
case MSG_ERROR_XFER:
case MSG_WARNING:
case MSG_LOG:
while (len) {
n = len;
if (n >= sizeof buf)
n = sizeof buf - 1;
readfd(fd, buf, n);
rwrite((enum logcode)tag, buf, n, !am_generator);
len -= n;
}
break;
default:
rprintf(FERROR, "unknown message %d:%d [%s]\n",
tag, len, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
no_flush--;
msg_fd_in = fd;
if (!--defer_forwarding_messages && !no_flush)
msg_flush();
}
/* This is used by the generator to limit how many file transfers can
* be active at once when --remove-source-files is specified. Without
* this, sender-side deletions were mostly happening at the end. */
void increment_active_files(int ndx, int itemizing, enum logcode code)
{
while (1) {
/* TODO: tune these limits? */
int limit = active_bytecnt >= 128*1024 ? 10 : 50;
if (active_filecnt < limit)
break;
check_for_finished_files(itemizing, code, 0);
if (active_filecnt < limit)
break;
if (iobuf_out_cnt)
io_flush(NORMAL_FLUSH);
else
read_msg_fd();
}
active_filecnt++;
active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]);
}
/* Write an message to a multiplexed stream. If this fails, rsync exits. */
static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert)
{
char buffer[BIGPATHBUFLEN]; /* Oversized for use by iconv code. */
size_t n = len;
#ifdef ICONV_OPTION
/* We need to convert buf before doing anything else so that we
* can include the (converted) byte length in the message header. */
if (convert && ic_send != (iconv_t)-1) {
xbuf outbuf, inbuf;
INIT_XBUF(outbuf, buffer + 4, 0, sizeof buffer - 4);
INIT_XBUF(inbuf, (char*)buf, len, -1);
iconvbufs(ic_send, &inbuf, &outbuf,
ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
if (inbuf.len > 0) {
rprintf(FERROR, "overflowed conversion buffer in mplex_write");
exit_cleanup(RERR_UNSUPPORTED);
}
n = len = outbuf.len;
} else
#endif
if (n > 1024 - 4) /* BIGPATHBUFLEN can handle 1024 bytes */
n = 0; /* We'd rather do 2 writes than too much memcpy(). */
else
memcpy(buffer + 4, buf, n);
SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len);
keep_defer_forwarding++; /* defer_forwarding_messages++ on return */
writefd_unbuffered(fd, buffer, n+4);
keep_defer_forwarding--;
if (len > n)
writefd_unbuffered(fd, buf+n, len-n);
if (!--defer_forwarding_messages && !no_flush)
msg_flush();
}
int send_msg(enum msgcode code, const char *buf, int len, int convert)
{
if (msg_fd_out < 0) {
if (!defer_forwarding_messages)
return io_multiplex_write(code, buf, len, convert);
if (!io_multiplexing_out)
return 0;
msg_list_add(&msg_queue, code, buf, len, convert);
return 1;
}
if (flist_forward_from >= 0)
msg_list_add(&msg_queue, code, buf, len, convert);
else
mplex_write(msg_fd_out, code, buf, len, convert);
return 1;
}
void send_msg_int(enum msgcode code, int num)
{
char numbuf[4];
SIVAL(numbuf, 0, num);
send_msg(code, numbuf, 4, 0);
}
void wait_for_receiver(void)
{
if (io_flush(NORMAL_FLUSH))
return;
read_msg_fd();
}
int get_redo_num(void)
{
return flist_ndx_pop(&redo_list);
}
int get_hlink_num(void)
{
return flist_ndx_pop(&hlink_list);
}
/**
* When we're the receiver and we have a local --files-from list of names
* that needs to be sent over the socket to the sender, we have to do two
* things at the same time: send the sender a list of what files we're
* processing and read the incoming file+info list from the sender. We do
* this by augmenting the read_timeout() function to copy this data. It
* uses ff_buf to read a block of data from f_in (when it is ready, since
* it might be a pipe) and then blast it out f_out (when it is ready to
* receive more data).
*/
void io_set_filesfrom_fds(int f_in, int f_out)
{
io_filesfrom_f_in = f_in;
io_filesfrom_f_out = f_out;
alloc_xbuf(&ff_buf, 2048);
#ifdef ICONV_OPTION
if (protect_args)
alloc_xbuf(&iconv_buf, 1024);
#endif
}
/* It's almost always an error to get an EOF when we're trying to read from the
* network, because the protocol is (for the most part) self-terminating.
*
* There is one case for the receiver when it is at the end of the transfer
* (hanging around reading any keep-alive packets that might come its way): if
* the sender dies before the generator's kill-signal comes through, we can end
* up here needing to loop until the kill-signal arrives. In this situation,
* kluge_around_eof will be < 0.
*
* There is another case for older protocol versions (< 24) where the module
* listing was not terminated, so we must ignore an EOF error in that case and
* exit. In this situation, kluge_around_eof will be > 0. */
static void whine_about_eof(int fd)
{
if (kluge_around_eof && fd == sock_f_in) {
int i;
if (kluge_around_eof > 0)
exit_cleanup(0);
/* If we're still here after 10 seconds, exit with an error. */
for (i = 10*1000/20; i--; )
msleep(20);
}
rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed "
"(%.0f bytes received so far) [%s]\n",
(double)stats.total_read, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
/**
* Read from a socket with I/O timeout. return the number of bytes
* read. If no bytes can be read then exit, never return a number <= 0.
*
* TODO: If the remote shell connection fails, then current versions
* actually report an "unexpected EOF" error here. Since it's a
* fairly common mistake to try to use rsh when ssh is required, we
* should trap that: if we fail to read any data at all, we should
* give a better explanation. We can tell whether the connection has
* started by looking e.g. at whether the remote version is known yet.
*/
static int read_timeout(int fd, char *buf, size_t len)
{
int n, cnt = 0;
io_flush(FULL_FLUSH);
while (cnt == 0) {
/* until we manage to read *something* */
fd_set r_fds, w_fds;
struct timeval tv;
int maxfd = fd;
int count;
FD_ZERO(&r_fds);
FD_ZERO(&w_fds);
FD_SET(fd, &r_fds);
if (io_filesfrom_f_out >= 0) {
int new_fd;
if (ff_buf.len == 0) {
if (io_filesfrom_f_in >= 0) {
FD_SET(io_filesfrom_f_in, &r_fds);
new_fd = io_filesfrom_f_in;
} else {
io_filesfrom_f_out = -1;
new_fd = -1;
}
} else {
FD_SET(io_filesfrom_f_out, &w_fds);
new_fd = io_filesfrom_f_out;
}
if (new_fd > maxfd)
maxfd = new_fd;
}
tv.tv_sec = select_timeout;
tv.tv_usec = 0;
errno = 0;
count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv);
if (count <= 0) {
if (errno == EBADF) {
defer_forwarding_messages = 0;
exit_cleanup(RERR_SOCKETIO);
}
check_timeout();
continue;
}
if (io_filesfrom_f_out >= 0) {
if (ff_buf.len) {
if (FD_ISSET(io_filesfrom_f_out, &w_fds)) {
int l = write(io_filesfrom_f_out,
ff_buf.buf + ff_buf.pos,
ff_buf.len);
if (l > 0) {
if (!(ff_buf.len -= l))
ff_buf.pos = 0;
else
ff_buf.pos += l;
} else if (errno != EINTR) {
/* XXX should we complain? */
io_filesfrom_f_out = -1;
}
}
} else if (io_filesfrom_f_in >= 0) {
if (FD_ISSET(io_filesfrom_f_in, &r_fds)) {
#ifdef ICONV_OPTION
xbuf *ibuf = filesfrom_convert ? &iconv_buf : &ff_buf;
#else
xbuf *ibuf = &ff_buf;
#endif
int l = read(io_filesfrom_f_in, ibuf->buf, ibuf->size);
if (l <= 0) {
if (l == 0 || errno != EINTR) {
/* Send end-of-file marker */
memcpy(ff_buf.buf, "\0\0", 2);
ff_buf.len = ff_lastchar? 2 : 1;
ff_buf.pos = 0;
io_filesfrom_f_in = -1;
}
} else {
#ifdef ICONV_OPTION
if (filesfrom_convert) {
iconv_buf.pos = 0;
iconv_buf.len = l;
iconvbufs(ic_send, &iconv_buf, &ff_buf,
ICB_EXPAND_OUT|ICB_INCLUDE_BAD|ICB_INCLUDE_INCOMPLETE);
l = ff_buf.len;
}
#endif
if (!eol_nulls) {
char *s = ff_buf.buf + l;
/* Transform CR and/or LF into '\0' */
while (s-- > ff_buf.buf) {
if (*s == '\n' || *s == '\r')
*s = '\0';
}
}
if (!ff_lastchar) {
/* Last buf ended with a '\0', so don't
* let this buf start with one. */
while (l && ff_buf.buf[ff_buf.pos] == '\0')
ff_buf.pos++, l--;
}
if (!l)
ff_buf.pos = 0;
else {
char *f = ff_buf.buf + ff_buf.pos;
char *t = f;
char *eob = f + l;
/* Eliminate any multi-'\0' runs. */
while (f != eob) {
if (!(*t++ = *f++)) {
while (f != eob && !*f)
f++, l--;
}
}
ff_lastchar = f[-1];
}
ff_buf.len = l;
}
}
}
}
if (!FD_ISSET(fd, &r_fds))
continue;
n = read(fd, buf, len);
if (n <= 0) {
if (n == 0)
whine_about_eof(fd); /* Doesn't return. */
if (errno == EINTR || errno == EWOULDBLOCK
|| errno == EAGAIN)
continue;
/* Don't write errors on a dead socket. */
if (fd == sock_f_in) {
io_end_multiplex_out();
rsyserr(FERROR_SOCKET, errno, "read error");
} else
rsyserr(FERROR, errno, "read error");
exit_cleanup(RERR_STREAMIO);
}
buf += n;
len -= n;
cnt += n;
if (fd == sock_f_in && io_timeout)
last_io_in = time(NULL);
}
return cnt;
}
/* Read a line into the "buf" buffer. */
int read_line(int fd, char *buf, size_t bufsiz, int flags)
{
char ch, *s, *eob;
int cnt;
#ifdef ICONV_OPTION
if (flags & RL_CONVERT && iconv_buf.size < bufsiz)
realloc_xbuf(&iconv_buf, bufsiz + 1024);
#endif
start:
#ifdef ICONV_OPTION
s = flags & RL_CONVERT ? iconv_buf.buf : buf;
#else
s = buf;
#endif
eob = s + bufsiz - 1;
while (1) {
cnt = read(fd, &ch, 1);
if (cnt < 0 && (errno == EWOULDBLOCK
|| errno == EINTR || errno == EAGAIN)) {
struct timeval tv;
fd_set r_fds, e_fds;
FD_ZERO(&r_fds);
FD_SET(fd, &r_fds);
FD_ZERO(&e_fds);
FD_SET(fd, &e_fds);
tv.tv_sec = select_timeout;
tv.tv_usec = 0;
if (!select(fd+1, &r_fds, NULL, &e_fds, &tv))
check_timeout();
/*if (FD_ISSET(fd, &e_fds))
rprintf(FINFO, "select exception on fd %d\n", fd); */
continue;
}
if (cnt != 1)
break;
if (flags & RL_EOL_NULLS ? ch == '\0' : (ch == '\r' || ch == '\n')) {
/* Skip empty lines if dumping comments. */
if (flags & RL_DUMP_COMMENTS && s == buf)
continue;
break;
}
if (s < eob)
*s++ = ch;
}
*s = '\0';
if (flags & RL_DUMP_COMMENTS && (*buf == '#' || *buf == ';'))
goto start;
#ifdef ICONV_OPTION
if (flags & RL_CONVERT) {
xbuf outbuf;
INIT_XBUF(outbuf, buf, 0, bufsiz);
iconv_buf.pos = 0;
iconv_buf.len = s - iconv_buf.buf;
iconvbufs(ic_recv, &iconv_buf, &outbuf,
ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
outbuf.buf[outbuf.len] = '\0';
return outbuf.len;
}
#endif
return s - buf;
}
void read_args(int f_in, char *mod_name, char *buf, size_t bufsiz, int rl_nulls,
char ***argv_p, int *argc_p, char **request_p)
{
int maxargs = MAX_ARGS;
int dot_pos = 0;
int argc = 0;
char **argv, *p;
int rl_flags = (rl_nulls ? RL_EOL_NULLS : 0);
#ifdef ICONV_OPTION
rl_flags |= (protect_args && ic_recv != (iconv_t)-1 ? RL_CONVERT : 0);
#endif
if (!(argv = new_array(char *, maxargs)))
out_of_memory("read_args");
if (mod_name && !protect_args)
argv[argc++] = "rsyncd";
while (1) {
if (read_line(f_in, buf, bufsiz, rl_flags) == 0)
break;
if (argc == maxargs-1) {
maxargs += MAX_ARGS;
if (!(argv = realloc_array(argv, char *, maxargs)))
out_of_memory("read_args");
}
if (dot_pos) {
if (request_p) {
*request_p = strdup(buf);
request_p = NULL;
}
if (mod_name)
glob_expand_module(mod_name, buf, &argv, &argc, &maxargs);
else
glob_expand(buf, &argv, &argc, &maxargs);
} else {
if (!(p = strdup(buf)))
out_of_memory("read_args");
argv[argc++] = p;
if (*p == '.' && p[1] == '\0')
dot_pos = argc;
}
}
argv[argc] = NULL;
glob_expand(NULL, NULL, NULL, NULL);
*argc_p = argc;
*argv_p = argv;
}
int io_start_buffering_out(int f_out)
{
if (iobuf_out) {
assert(f_out == iobuf_f_out);
return 0;
}
if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE)))
out_of_memory("io_start_buffering_out");
iobuf_out_cnt = 0;
iobuf_f_out = f_out;
return 1;
}
int io_start_buffering_in(int f_in)
{
if (iobuf_in) {
assert(f_in == iobuf_f_in);
return 0;
}
iobuf_in_siz = 2 * IO_BUFFER_SIZE;
if (!(iobuf_in = new_array(char, iobuf_in_siz)))
out_of_memory("io_start_buffering_in");
iobuf_f_in = f_in;
return 1;
}
void io_end_buffering_in(void)
{
if (!iobuf_in)
return;
free(iobuf_in);
iobuf_in = NULL;
iobuf_in_ndx = 0;
iobuf_in_remaining = 0;
iobuf_f_in = -1;
}
void io_end_buffering_out(void)
{
if (!iobuf_out)
return;
io_flush(FULL_FLUSH);
free(iobuf_out);
iobuf_out = NULL;
iobuf_f_out = -1;
}
void maybe_flush_socket(int important)
{
if (iobuf_out && iobuf_out_cnt
&& (important || time(NULL) - last_io_out >= 5))
io_flush(NORMAL_FLUSH);
}
void maybe_send_keepalive(void)
{
if (time(NULL) - last_io_out >= allowed_lull) {
if (!iobuf_out || !iobuf_out_cnt) {
if (protocol_version < 29)
send_msg(MSG_DATA, "", 0, 0);
else if (protocol_version >= 30)
send_msg(MSG_NOOP, "", 0, 0);
else {
write_int(sock_f_out, cur_flist->used);
write_shortint(sock_f_out, ITEM_IS_NEW);
}
}
if (iobuf_out)
io_flush(NORMAL_FLUSH);
}
}
void start_flist_forward(int f_in)
{
assert(iobuf_out != NULL);
assert(iobuf_f_out == msg_fd_out);
flist_forward_from = f_in;
defer_forwarding_messages++;
}
void stop_flist_forward(void)
{
flist_forward_from = -1;
defer_forwarding_messages--;
io_flush(FULL_FLUSH);
}
/**
* Continue trying to read len bytes - don't return until len has been
* read.
**/
static void read_loop(int fd, char *buf, size_t len)
{
while (len) {
int n = read_timeout(fd, buf, len);
buf += n;
len -= n;
}
}
/**
* Read from the file descriptor handling multiplexing - return number
* of bytes read.
*
* Never returns <= 0.