1 /* -*- c-file-style: "linux" -*-
3 * Copyright (C) 1996-2001 by Andrew Tridgell
4 * Copyright (C) Paul Mackerras 1996
5 * Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 * Socket and pipe I/O utilities used in rsync.
27 * rsync provides its own multiplexing system, which is used to send
28 * stderr and stdout over a single socket. We need this because
29 * stdout normally carries the binary data stream, and stderr all our
32 * For historical reasons this is off during the start of the
33 * connection, but it's switched on quite early using
34 * io_start_multiplex_out() and io_start_multiplex_in().
39 /** If no timeout is specified then use a 60 second select timeout */
40 #define SELECT_TIMEOUT 60
43 extern size_t bwlimit_writemax;
45 extern int io_timeout;
49 extern int am_generator;
51 extern int csum_length;
52 extern int checksum_seed;
53 extern int protocol_version;
54 extern char *filesfrom_host;
55 extern struct stats stats;
57 const char phase_unknown[] = "unknown";
58 int select_timeout = SELECT_TIMEOUT;
59 int ignore_timeout = 0;
61 int batch_gen_fd = -1;
64 * The connection might be dropped at some point; perhaps because the
65 * remote instance crashed. Just giving the offset on the stream is
66 * not very helpful. So instead we try to make io_phase_name point to
69 * For buffered/multiplexed I/O these names will be somewhat
70 * approximate; perhaps for ease of support we would rather make the
71 * buffer always flush when a single application-level I/O finishes.
73 * @todo Perhaps we want some simple stack functionality, but there's
74 * no need to overdo it.
76 const char *io_write_phase = phase_unknown;
77 const char *io_read_phase = phase_unknown;
79 /* Ignore an EOF error if non-zero. See whine_about_eof(). */
80 int kluge_around_eof = 0;
85 static int io_multiplexing_out;
86 static int io_multiplexing_in;
87 static int sock_f_in = -1;
88 static int sock_f_out = -1;
89 static time_t last_io;
92 static int write_batch_monitor_in = -1;
93 static int write_batch_monitor_out = -1;
95 static int io_filesfrom_f_in = -1;
96 static int io_filesfrom_f_out = -1;
97 static char io_filesfrom_buf[2048];
98 static char *io_filesfrom_bp;
99 static char io_filesfrom_lastchar;
100 static int io_filesfrom_buflen;
101 static size_t contiguous_write_len = 0;
103 static void read_loop(int fd, char *buf, size_t len);
106 struct redo_list *next;
110 static struct redo_list *redo_list_head;
111 static struct redo_list *redo_list_tail;
114 struct msg_list *next;
119 static struct msg_list *msg_list_head;
120 static struct msg_list *msg_list_tail;
122 static void redo_list_add(int num)
124 struct redo_list *rl;
126 if (!(rl = new(struct redo_list)))
127 exit_cleanup(RERR_MALLOC);
131 redo_list_tail->next = rl;
137 static void check_timeout(void)
141 if (!io_timeout || ignore_timeout)
145 last_io = time(NULL);
151 if (t - last_io >= io_timeout) {
152 if (!am_server && !am_daemon) {
153 rprintf(FERROR, "io timeout after %d seconds -- exiting\n",
156 exit_cleanup(RERR_TIMEOUT);
160 /* Note the fds used for the main socket (which might really be a pipe
161 * for a local transfer, but we can ignore that). */
162 void io_set_sock_fds(int f_in, int f_out)
168 /* Setup the fd used to receive MSG_* messages. Only needed during the
169 * early stages of being a local sender (up through the sending of the
170 * file list) or when we're the generator (to fetch the messages from
172 void set_msg_fd_in(int fd)
177 /* Setup the fd used to send our MSG_* messages. Only needed when
178 * we're the receiver (to send our messages to the generator). */
179 void set_msg_fd_out(int fd)
182 set_nonblocking(msg_fd_out);
185 /* Add a message to the pending MSG_* list. */
186 static void msg_list_add(int code, char *buf, int len)
190 if (!(ml = new(struct msg_list)))
191 exit_cleanup(RERR_MALLOC);
193 if (!(ml->buf = new_array(char, len+4)))
194 exit_cleanup(RERR_MALLOC);
195 SIVAL(ml->buf, 0, ((code+MPLEX_BASE)<<24) | len);
196 memcpy(ml->buf+4, buf, len);
199 msg_list_tail->next = ml;
205 void send_msg(enum msgcode code, char *buf, int len)
207 if (msg_fd_out < 0) {
208 io_multiplex_write(code, buf, len);
211 msg_list_add(code, buf, len);
212 msg_list_push(NORMAL_FLUSH);
215 /* Read a message from the MSG_* fd and handle it. This is called either
216 * during the early stages of being a local sender (up through the sending
217 * of the file list) or when we're the generator (to fetch the messages
218 * from the receiver). */
219 static void read_msg_fd(void)
226 /* Temporarily disable msg_fd_in. This is needed to avoid looping back
227 * to this routine from writefd_unbuffered(). */
230 read_loop(fd, buf, 4);
233 len = tag & 0xFFFFFF;
234 tag = (tag >> 24) - MPLEX_BASE;
238 if (len != 0 || !am_generator) {
239 rprintf(FERROR, "invalid message %d:%d\n", tag, len);
240 exit_cleanup(RERR_STREAMIO);
245 if (len != 4 || !am_generator) {
246 rprintf(FERROR, "invalid message %d:%d\n", tag, len);
247 exit_cleanup(RERR_STREAMIO);
249 read_loop(fd, buf, 4);
250 redo_list_add(IVAL(buf,0));
253 if (len >= (int)sizeof buf || !am_generator) {
254 rprintf(FERROR, "invalid message %d:%d\n", tag, len);
255 exit_cleanup(RERR_STREAMIO);
257 read_loop(fd, buf, len);
258 io_multiplex_write(MSG_DELETED, buf, len);
261 if (len != 4 || !am_generator) {
262 rprintf(FERROR, "invalid message %d:%d\n", tag, len);
263 exit_cleanup(RERR_STREAMIO);
265 read_loop(fd, buf, len);
266 io_multiplex_write(MSG_SUCCESS, buf, len);
275 read_loop(fd, buf, n);
276 rwrite((enum logcode)tag, buf, n);
281 rprintf(FERROR, "unknown message %d:%d\n", tag, len);
282 exit_cleanup(RERR_STREAMIO);
288 /* Try to push messages off the list onto the wire. If we leave with more
289 * to do, return 0. On error, return -1. If everything flushed, return 1.
290 * This is only active in the receiver. */
291 int msg_list_push(int flush_it_all)
293 static int written = 0;
300 while (msg_list_head) {
301 struct msg_list *ml = msg_list_head;
302 int n = write(msg_fd_out, ml->buf + written, ml->len - written);
306 if (errno != EWOULDBLOCK && errno != EAGAIN)
311 FD_SET(msg_fd_out, &fds);
312 tv.tv_sec = select_timeout;
314 if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv))
316 } else if ((written += n) == ml->len) {
318 msg_list_head = ml->next;
320 msg_list_tail = NULL;
328 int get_redo_num(void)
330 struct redo_list *next;
333 while (!redo_list_head)
336 num = redo_list_head->num;
337 next = redo_list_head->next;
338 free(redo_list_head);
339 redo_list_head = next;
341 redo_list_tail = NULL;
347 * When we're the receiver and we have a local --files-from list of names
348 * that needs to be sent over the socket to the sender, we have to do two
349 * things at the same time: send the sender a list of what files we're
350 * processing and read the incoming file+info list from the sender. We do
351 * this by augmenting the read_timeout() function to copy this data. It
352 * uses the io_filesfrom_buf to read a block of data from f_in (when it is
353 * ready, since it might be a pipe) and then blast it out f_out (when it
354 * is ready to receive more data).
356 void io_set_filesfrom_fds(int f_in, int f_out)
358 io_filesfrom_f_in = f_in;
359 io_filesfrom_f_out = f_out;
360 io_filesfrom_bp = io_filesfrom_buf;
361 io_filesfrom_lastchar = '\0';
362 io_filesfrom_buflen = 0;
365 /* It's almost always an error to get an EOF when we're trying to read from the
366 * network, because the protocol is (for the most part) self-terminating.
368 * There is one case for the receiver when it is at the end of the transfer
369 * (hanging around reading any keep-alive packets that might come its way): if
370 * the sender dies before the generator's kill-signal comes through, we can end
371 * up here needing to loop until the kill-signal arrives. In this situation,
372 * kluge_around_eof will be < 0.
374 * There is another case for older protocol versions (< 24) where the module
375 * listing was not terminated, so we must ignore an EOF error in that case and
376 * exit. In this situation, kluge_around_eof will be > 0. */
377 static void whine_about_eof(int fd)
379 if (kluge_around_eof && fd == sock_f_in) {
381 if (kluge_around_eof > 0)
383 /* If we're still here after 10 seconds, exit with an error. */
384 for (i = 10*1000/20; i--; )
388 rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed "
389 "(%.0f bytes received so far) [%s]\n",
390 (double)stats.total_read, who_am_i());
392 exit_cleanup(RERR_STREAMIO);
397 * Read from a socket with I/O timeout. return the number of bytes
398 * read. If no bytes can be read then exit, never return a number <= 0.
400 * TODO: If the remote shell connection fails, then current versions
401 * actually report an "unexpected EOF" error here. Since it's a
402 * fairly common mistake to try to use rsh when ssh is required, we
403 * should trap that: if we fail to read any data at all, we should
404 * give a better explanation. We can tell whether the connection has
405 * started by looking e.g. at whether the remote version is known yet.
407 static int read_timeout(int fd, char *buf, size_t len)
411 io_flush(NORMAL_FLUSH);
414 /* until we manage to read *something* */
424 FD_SET(msg_fd_out, &w_fds);
425 if (msg_fd_out > maxfd)
428 if (io_filesfrom_f_out >= 0) {
430 if (io_filesfrom_buflen == 0) {
431 if (io_filesfrom_f_in >= 0) {
432 FD_SET(io_filesfrom_f_in, &r_fds);
433 new_fd = io_filesfrom_f_in;
435 io_filesfrom_f_out = -1;
439 FD_SET(io_filesfrom_f_out, &w_fds);
440 new_fd = io_filesfrom_f_out;
446 tv.tv_sec = select_timeout;
451 count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv);
455 exit_cleanup(RERR_SOCKETIO);
460 if (msg_list_head && FD_ISSET(msg_fd_out, &w_fds))
461 msg_list_push(NORMAL_FLUSH);
463 if (io_filesfrom_f_out >= 0) {
464 if (io_filesfrom_buflen) {
465 if (FD_ISSET(io_filesfrom_f_out, &w_fds)) {
466 int l = write(io_filesfrom_f_out,
468 io_filesfrom_buflen);
470 if (!(io_filesfrom_buflen -= l))
471 io_filesfrom_bp = io_filesfrom_buf;
473 io_filesfrom_bp += l;
475 /* XXX should we complain? */
476 io_filesfrom_f_out = -1;
479 } else if (io_filesfrom_f_in >= 0) {
480 if (FD_ISSET(io_filesfrom_f_in, &r_fds)) {
481 int l = read(io_filesfrom_f_in,
483 sizeof io_filesfrom_buf);
485 /* Send end-of-file marker */
486 io_filesfrom_buf[0] = '\0';
487 io_filesfrom_buf[1] = '\0';
488 io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1;
489 io_filesfrom_f_in = -1;
492 char *s = io_filesfrom_buf + l;
493 /* Transform CR and/or LF into '\0' */
494 while (s-- > io_filesfrom_buf) {
495 if (*s == '\n' || *s == '\r')
499 if (!io_filesfrom_lastchar) {
500 /* Last buf ended with a '\0', so don't
501 * let this buf start with one. */
502 while (l && !*io_filesfrom_bp)
503 io_filesfrom_bp++, l--;
506 io_filesfrom_bp = io_filesfrom_buf;
508 char *f = io_filesfrom_bp;
511 /* Eliminate any multi-'\0' runs. */
513 if (!(*t++ = *f++)) {
514 while (f != eob && !*f)
518 io_filesfrom_lastchar = f[-1];
520 io_filesfrom_buflen = l;
526 if (!FD_ISSET(fd, &r_fds))
529 n = read(fd, buf, len);
533 whine_about_eof(fd); /* Doesn't return. */
534 if (errno == EINTR || errno == EWOULDBLOCK
538 /* Don't write errors on a dead socket. */
540 close_multiplexing_out();
541 rsyserr(FERROR, errno, "read error");
542 exit_cleanup(RERR_STREAMIO);
549 if (io_timeout && fd == sock_f_in)
550 last_io = time(NULL);
557 * Read a line into the "fname" buffer (which must be at least MAXPATHLEN
560 int read_filesfrom_line(int fd, char *fname)
562 char ch, *s, *eob = fname + MAXPATHLEN - 1;
564 int reading_remotely = filesfrom_host != NULL;
565 int nulls = eol_nulls || reading_remotely;
570 cnt = read(fd, &ch, 1);
571 if (cnt < 0 && (errno == EWOULDBLOCK
572 || errno == EINTR || errno == EAGAIN)) {
577 tv.tv_sec = select_timeout;
579 if (!select(fd+1, &fds, NULL, NULL, &tv))
585 if (nulls? !ch : (ch == '\r' || ch == '\n')) {
586 /* Skip empty lines if reading locally. */
587 if (!reading_remotely && s == fname)
597 if (*fname == '#' || *fname == ';')
604 static char *iobuf_out;
605 static int iobuf_out_cnt;
607 void io_start_buffering_out(void)
611 if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE)))
612 out_of_memory("io_start_buffering_out");
617 static char *iobuf_in;
618 static size_t iobuf_in_siz;
620 void io_start_buffering_in(void)
624 iobuf_in_siz = 2 * IO_BUFFER_SIZE;
625 if (!(iobuf_in = new_array(char, iobuf_in_siz)))
626 out_of_memory("io_start_buffering_in");
630 void io_end_buffering(void)
632 io_flush(NORMAL_FLUSH);
633 if (!io_multiplexing_out) {
640 void maybe_send_keepalive(int allowed_lull, int ndx)
642 if (time(NULL) - last_io >= allowed_lull) {
643 if (!iobuf_out || !iobuf_out_cnt) {
644 if (protocol_version < 29)
645 return; /* there's nothing we can do */
646 write_int(sock_f_out, ndx);
647 write_shortint(sock_f_out, ITEM_IS_NEW);
650 io_flush(NORMAL_FLUSH);
656 * Continue trying to read len bytes - don't return until len has been
659 static void read_loop(int fd, char *buf, size_t len)
662 int n = read_timeout(fd, buf, len);
671 * Read from the file descriptor handling multiplexing - return number
674 * Never returns <= 0.
676 static int readfd_unbuffered(int fd, char *buf, size_t len)
678 static size_t remaining;
679 static size_t iobuf_in_ndx;
681 char line[MAXPATHLEN+1];
683 if (!iobuf_in || fd != sock_f_in)
684 return read_timeout(fd, buf, len);
686 if (!io_multiplexing_in && remaining == 0) {
687 remaining = read_timeout(fd, iobuf_in, iobuf_in_siz);
693 len = MIN(len, remaining);
694 memcpy(buf, iobuf_in + iobuf_in_ndx, len);
701 read_loop(fd, line, 4);
704 remaining = tag & 0xFFFFFF;
705 tag = (tag >> 24) - MPLEX_BASE;
709 if (remaining > iobuf_in_siz) {
710 if (!(iobuf_in = realloc_array(iobuf_in, char,
712 out_of_memory("readfd_unbuffered");
713 iobuf_in_siz = remaining;
715 read_loop(fd, iobuf_in, remaining);
719 if (remaining >= sizeof line) {
720 rprintf(FERROR, "invalid multi-message %d:%ld\n",
721 tag, (long)remaining);
722 exit_cleanup(RERR_STREAMIO);
724 read_loop(fd, line, remaining);
725 line[remaining] = '\0';
726 /* A directory name was sent with the trailing null */
727 if (remaining > 0 && !line[remaining-1])
728 log_delete(line, S_IFDIR);
730 log_delete(line, S_IFREG);
734 if (remaining != 4) {
735 rprintf(FERROR, "invalid multi-message %d:%ld\n",
736 tag, (long)remaining);
737 exit_cleanup(RERR_STREAMIO);
739 read_loop(fd, line, remaining);
740 successful_send(IVAL(line, 0));
745 if (remaining >= sizeof line) {
747 "[%s] multiplexing overflow %d:%ld\n\n",
748 who_am_i(), tag, (long)remaining);
749 exit_cleanup(RERR_STREAMIO);
751 read_loop(fd, line, remaining);
752 rwrite((enum logcode)tag, line, remaining);
756 rprintf(FERROR, "[%s] unexpected tag %d\n",
758 exit_cleanup(RERR_STREAMIO);
763 io_flush(NORMAL_FLUSH);
771 * Do a buffered read from @p fd. Don't return until all @p n bytes
772 * have been read. If all @p n can't be read then exit with an
775 static void readfd(int fd, char *buffer, size_t N)
781 ret = readfd_unbuffered(fd, buffer + total, N-total);
785 if (fd == write_batch_monitor_in) {
786 if ((size_t)write(batch_fd, buffer, total) != total)
787 exit_cleanup(RERR_FILEIO);
791 stats.total_read += total;
795 int read_shortint(int f)
798 readfd(f, (char *)b, 2);
799 return (b[1] << 8) + b[0];
803 int32 read_int(int f)
810 if (ret == (int32)0xffffffff)
815 int64 read_longint(int f)
821 if ((int32)ret != (int32)0xffffffff)
825 rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
826 exit_cleanup(RERR_UNSUPPORTED);
829 ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32);
835 void read_buf(int f,char *buf,size_t len)
840 void read_sbuf(int f,char *buf,size_t len)
846 uchar read_byte(int f)
849 readfd(f, (char *)&c, 1);
853 int read_vstring(int f, char *buf, int bufsize)
855 int len = read_byte(f);
858 len = (len & ~0x80) * 0x100 + read_byte(f);
860 if (len >= bufsize) {
861 rprintf(FERROR, "over-long vstring received (%d > %d)\n",
863 exit_cleanup(RERR_PROTOCOL);
872 /* Populate a sum_struct with values from the socket. This is
873 * called by both the sender and the receiver. */
874 void read_sum_head(int f, struct sum_struct *sum)
876 sum->count = read_int(f);
877 sum->blength = read_int(f);
878 if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) {
879 rprintf(FERROR, "[%s] Invalid block length %ld\n",
880 who_am_i(), (long)sum->blength);
881 exit_cleanup(RERR_PROTOCOL);
883 sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f);
884 if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) {
885 rprintf(FERROR, "[%s] Invalid checksum length %d\n",
886 who_am_i(), sum->s2length);
887 exit_cleanup(RERR_PROTOCOL);
889 sum->remainder = read_int(f);
890 if (sum->remainder < 0 || sum->remainder > sum->blength) {
891 rprintf(FERROR, "[%s] Invalid remainder length %ld\n",
892 who_am_i(), (long)sum->remainder);
893 exit_cleanup(RERR_PROTOCOL);
897 /* Send the values from a sum_struct over the socket. Set sum to
898 * NULL if there are no checksums to send. This is called by both
899 * the generator and the sender. */
900 void write_sum_head(int f, struct sum_struct *sum)
902 static struct sum_struct null_sum;
907 write_int(f, sum->count);
908 write_int(f, sum->blength);
909 if (protocol_version >= 27)
910 write_int(f, sum->s2length);
911 write_int(f, sum->remainder);
916 * Sleep after writing to limit I/O bandwidth usage.
918 * @todo Rather than sleeping after each write, it might be better to
919 * use some kind of averaging. The current algorithm seems to always
920 * use a bit less bandwidth than specified, because it doesn't make up
921 * for slow periods. But arguably this is a feature. In addition, we
922 * ought to take the time used to write the data into account.
924 * During some phases of big transfers (file FOO is uptodate) this is
925 * called with a small bytes_written every time. As the kernel has to
926 * round small waits up to guarantee that we actually wait at least the
927 * requested number of microseconds, this can become grossly inaccurate.
928 * We therefore keep track of the bytes we've written over time and only
929 * sleep when the accumulated delay is at least 1 tenth of a second.
931 static void sleep_for_bwlimit(int bytes_written)
933 static struct timeval prior_tv;
934 static long total_written = 0;
935 struct timeval tv, start_tv;
936 long elapsed_usec, sleep_usec;
938 #define ONE_SEC 1000000L /* # of microseconds in a second */
943 total_written += bytes_written;
945 gettimeofday(&start_tv, NULL);
946 if (prior_tv.tv_sec) {
947 elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC
948 + (start_tv.tv_usec - prior_tv.tv_usec);
949 total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024);
950 if (total_written < 0)
954 sleep_usec = total_written * (ONE_SEC/1024) / bwlimit;
955 if (sleep_usec < ONE_SEC / 10) {
960 tv.tv_sec = sleep_usec / ONE_SEC;
961 tv.tv_usec = sleep_usec % ONE_SEC;
962 select(0, NULL, NULL, NULL, &tv);
964 gettimeofday(&prior_tv, NULL);
965 elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC
966 + (prior_tv.tv_usec - start_tv.tv_usec);
967 total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024);
971 /* Write len bytes to the file descriptor fd, looping as necessary to get
972 * the job done and also (in certain circumstnces) reading any data on
973 * msg_fd_in to avoid deadlock.
975 * This function underlies the multiplexing system. The body of the
976 * application never calls this function directly. */
977 static void writefd_unbuffered(int fd,char *buf,size_t len)
981 int maxfd, count, ret;
986 while (total < len) {
991 if (msg_fd_in >= 0 && len-total >= contiguous_write_len) {
993 FD_SET(msg_fd_in,&r_fds);
994 if (msg_fd_in > maxfd)
997 if (fd != sock_f_out && iobuf_out_cnt && no_flush == 1) {
998 FD_SET(sock_f_out, &w_fds);
999 if (sock_f_out > maxfd)
1003 tv.tv_sec = select_timeout;
1007 count = select(maxfd + 1, msg_fd_in >= 0 ? &r_fds : NULL,
1011 if (count < 0 && errno == EBADF)
1012 exit_cleanup(RERR_SOCKETIO);
1017 if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds))
1020 if (!FD_ISSET(fd, &w_fds)) {
1021 if (fd != sock_f_out && iobuf_out_cnt) {
1023 io_flush(NORMAL_FLUSH);
1030 if (bwlimit && n > bwlimit_writemax)
1031 n = bwlimit_writemax;
1032 ret = write(fd, buf + total, n);
1038 if (errno == EWOULDBLOCK || errno == EAGAIN) {
1044 /* Don't try to write errors back across the stream. */
1045 if (fd == sock_f_out)
1046 close_multiplexing_out();
1047 rsyserr(FERROR, errno,
1048 "writefd_unbuffered failed to write %ld bytes: phase \"%s\" [%s]",
1049 (long)len, io_write_phase, who_am_i());
1050 /* If the other side is sending us error messages, try
1051 * to grab any messages they sent before they died. */
1052 while (fd == sock_f_out && io_multiplexing_in) {
1053 io_timeout = select_timeout = 30;
1055 readfd_unbuffered(sock_f_in, io_filesfrom_buf,
1056 sizeof io_filesfrom_buf);
1058 exit_cleanup(RERR_STREAMIO);
1063 if (fd == sock_f_out) {
1065 last_io = time(NULL);
1066 sleep_for_bwlimit(ret);
1075 * Write an message to a multiplexed stream. If this fails then rsync
1078 static void mplex_write(enum msgcode code, char *buf, size_t len)
1083 SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len);
1085 /* When the generator reads messages from the msg_fd_in pipe, it can
1086 * cause output to occur down the socket. Setting contiguous_write_len
1087 * prevents the reading of msg_fd_in once we actually start to write
1088 * this sequence of data (though we might read it before the start). */
1089 if (am_generator && msg_fd_in >= 0)
1090 contiguous_write_len = len + 4;
1092 if (n > sizeof buffer - 4)
1093 n = sizeof buffer - 4;
1095 memcpy(&buffer[4], buf, n);
1096 writefd_unbuffered(sock_f_out, buffer, n+4);
1102 writefd_unbuffered(sock_f_out, buf, len);
1104 if (am_generator && msg_fd_in >= 0)
1105 contiguous_write_len = 0;
1109 void io_flush(int flush_it_all)
1111 msg_list_push(flush_it_all);
1113 if (!iobuf_out_cnt || no_flush)
1116 if (io_multiplexing_out)
1117 mplex_write(MSG_DATA, iobuf_out, iobuf_out_cnt);
1119 writefd_unbuffered(sock_f_out, iobuf_out, iobuf_out_cnt);
1124 static void writefd(int fd,char *buf,size_t len)
1126 if (fd == msg_fd_out) {
1127 rprintf(FERROR, "Internal error: wrong write used in receiver.\n");
1128 exit_cleanup(RERR_PROTOCOL);
1131 if (fd == sock_f_out)
1132 stats.total_written += len;
1134 if (fd == write_batch_monitor_out) {
1135 if ((size_t)write(batch_fd, buf, len) != len)
1136 exit_cleanup(RERR_FILEIO);
1139 if (!iobuf_out || fd != sock_f_out) {
1140 writefd_unbuffered(fd, buf, len);
1145 int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt);
1147 memcpy(iobuf_out+iobuf_out_cnt, buf, n);
1153 if (iobuf_out_cnt == IO_BUFFER_SIZE)
1154 io_flush(NORMAL_FLUSH);
1159 void write_shortint(int f, int x)
1164 writefd(f, (char *)b, 2);
1168 void write_int(int f,int32 x)
1176 void write_int_named(int f, int32 x, const char *phase)
1178 io_write_phase = phase;
1180 io_write_phase = phase_unknown;
1185 * Note: int64 may actually be a 32-bit type if ./configure couldn't find any
1186 * 64-bit types on this platform.
1188 void write_longint(int f, int64 x)
1192 if (x <= 0x7FFFFFFF) {
1193 write_int(f, (int)x);
1197 #if SIZEOF_INT64 < 8
1198 rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
1199 exit_cleanup(RERR_UNSUPPORTED);
1201 write_int(f, (int32)0xFFFFFFFF);
1202 SIVAL(b,0,(x&0xFFFFFFFF));
1203 SIVAL(b,4,((x>>32)&0xFFFFFFFF));
1209 void write_buf(int f,char *buf,size_t len)
1214 /** Write a string to the connection */
1215 void write_sbuf(int f, char *buf)
1217 writefd(f, buf, strlen(buf));
1220 void write_byte(int f, uchar c)
1222 writefd(f, (char *)&c, 1);
1225 void write_vstring(int f, char *str, int len)
1227 uchar lenbuf[3], *lb = lenbuf;
1232 "attempting to send over-long vstring (%d > %d)\n",
1234 exit_cleanup(RERR_PROTOCOL);
1236 *lb++ = len / 0x100 + 0x80;
1240 writefd(f, (char*)lenbuf, lb - lenbuf + 1);
1242 writefd(f, str, len);
1247 * Read a line of up to @p maxlen characters into @p buf (not counting
1248 * the trailing null). Strips the (required) trailing newline and all
1251 * @return 1 for success; 0 for I/O error or truncation.
1253 int read_line(int f, char *buf, size_t maxlen)
1257 read_buf(f, buf, 1);
1262 if (buf[0] != '\r') {
1272 void io_printf(int fd, const char *format, ...)
1278 va_start(ap, format);
1279 len = vsnprintf(buf, sizeof buf, format, ap);
1283 exit_cleanup(RERR_STREAMIO);
1285 write_sbuf(fd, buf);
1289 /** Setup for multiplexing a MSG_* stream with the data stream. */
1290 void io_start_multiplex_out(void)
1292 io_flush(NORMAL_FLUSH);
1293 io_start_buffering_out();
1294 io_multiplexing_out = 1;
1297 /** Setup for multiplexing a MSG_* stream with the data stream. */
1298 void io_start_multiplex_in(void)
1300 io_flush(NORMAL_FLUSH);
1301 io_start_buffering_in();
1302 io_multiplexing_in = 1;
1305 /** Write an message to the multiplexed data stream. */
1306 int io_multiplex_write(enum msgcode code, char *buf, size_t len)
1308 if (!io_multiplexing_out)
1311 io_flush(NORMAL_FLUSH);
1312 stats.total_written += (len+4);
1313 mplex_write(code, buf, len);
1317 void close_multiplexing_in(void)
1319 io_multiplexing_in = 0;
1322 /** Stop output multiplexing. */
1323 void close_multiplexing_out(void)
1325 io_multiplexing_out = 0;
1328 void start_write_batch(int fd)
1330 write_stream_flags(batch_fd);
1332 /* Some communication has already taken place, but we don't
1333 * enable batch writing until here so that we can write a
1334 * canonical record of the communication even though the
1335 * actual communication so far depends on whether a daemon
1337 write_int(batch_fd, protocol_version);
1338 write_int(batch_fd, checksum_seed);
1341 write_batch_monitor_out = fd;
1343 write_batch_monitor_in = fd;
1346 void stop_write_batch(void)
1348 write_batch_monitor_out = -1;
1349 write_batch_monitor_in = -1;