Commit | Line | Data |
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7a24c346 | 1 | /* -*- c-file-style: "linux" -*- |
d62bcc17 WD |
2 | * |
3 | * Copyright (C) 1996-2001 by Andrew Tridgell | |
880da007 MP |
4 | * Copyright (C) Paul Mackerras 1996 |
5 | * Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org> | |
d62bcc17 | 6 | * |
880da007 MP |
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. | |
d62bcc17 | 11 | * |
880da007 MP |
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. | |
d62bcc17 | 16 | * |
880da007 MP |
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. | |
20 | */ | |
720b47f2 | 21 | |
87ee2481 | 22 | /** |
87ee2481 MP |
23 | * @file io.c |
24 | * | |
6ed6d7f5 | 25 | * Socket and pipe I/O utilities used in rsync. |
87ee2481 MP |
26 | * |
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 | |
30 | * error messages. | |
31 | * | |
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(). | |
35 | **/ | |
720b47f2 | 36 | |
720b47f2 AT |
37 | #include "rsync.h" |
38 | ||
880da007 | 39 | /** If no timeout is specified then use a 60 second select timeout */ |
8cd9fd4e AT |
40 | #define SELECT_TIMEOUT 60 |
41 | ||
7a55d06e | 42 | extern int bwlimit; |
71e58630 | 43 | extern size_t bwlimit_writemax; |
720b47f2 | 44 | extern int verbose; |
6ba9279f | 45 | extern int io_timeout; |
cdf236aa | 46 | extern int allowed_lull; |
d17e1dd2 WD |
47 | extern int am_server; |
48 | extern int am_daemon; | |
49 | extern int am_sender; | |
98f8c9a5 | 50 | extern int am_generator; |
e626b29e | 51 | extern int eol_nulls; |
3b0a30eb | 52 | extern int read_batch; |
188fed95 | 53 | extern int csum_length; |
b9f592fb WD |
54 | extern int checksum_seed; |
55 | extern int protocol_version; | |
cdf236aa WD |
56 | extern int remove_sent_files; |
57 | extern int preserve_hard_links; | |
d19320fd | 58 | extern char *filesfrom_host; |
a800434a | 59 | extern struct stats stats; |
cdf236aa | 60 | extern struct file_list *the_file_list; |
720b47f2 | 61 | |
a86179f4 | 62 | const char phase_unknown[] = "unknown"; |
9e2409ab | 63 | int ignore_timeout = 0; |
b9f592fb | 64 | int batch_fd = -1; |
b0ad5429 | 65 | int batch_gen_fd = -1; |
805edf9d | 66 | |
98b332ed MP |
67 | /** |
68 | * The connection might be dropped at some point; perhaps because the | |
69 | * remote instance crashed. Just giving the offset on the stream is | |
70 | * not very helpful. So instead we try to make io_phase_name point to | |
71 | * something useful. | |
eca2adb4 | 72 | * |
6ed6d7f5 | 73 | * For buffered/multiplexed I/O these names will be somewhat |
805edf9d | 74 | * approximate; perhaps for ease of support we would rather make the |
6ed6d7f5 | 75 | * buffer always flush when a single application-level I/O finishes. |
805edf9d | 76 | * |
eca2adb4 MP |
77 | * @todo Perhaps we want some simple stack functionality, but there's |
78 | * no need to overdo it. | |
98b332ed | 79 | **/ |
805edf9d MP |
80 | const char *io_write_phase = phase_unknown; |
81 | const char *io_read_phase = phase_unknown; | |
98b332ed | 82 | |
cb2e1f18 | 83 | /* Ignore an EOF error if non-zero. See whine_about_eof(). */ |
574c2500 | 84 | int kluge_around_eof = 0; |
7a55d06e | 85 | |
d17e1dd2 WD |
86 | int msg_fd_in = -1; |
87 | int msg_fd_out = -1; | |
cdf236aa WD |
88 | int sock_f_in = -1; |
89 | int sock_f_out = -1; | |
7a55d06e | 90 | |
1f75bb10 WD |
91 | static int io_multiplexing_out; |
92 | static int io_multiplexing_in; | |
3b0a30eb WD |
93 | static time_t last_io_in; |
94 | static time_t last_io_out; | |
1f75bb10 WD |
95 | static int no_flush; |
96 | ||
b9f592fb WD |
97 | static int write_batch_monitor_in = -1; |
98 | static int write_batch_monitor_out = -1; | |
99 | ||
56014c8c WD |
100 | static int io_filesfrom_f_in = -1; |
101 | static int io_filesfrom_f_out = -1; | |
102 | static char io_filesfrom_buf[2048]; | |
103 | static char *io_filesfrom_bp; | |
104 | static char io_filesfrom_lastchar; | |
105 | static int io_filesfrom_buflen; | |
af436313 | 106 | static size_t contiguous_write_len = 0; |
3b0a30eb | 107 | static int select_timeout = SELECT_TIMEOUT; |
720b47f2 | 108 | |
9dd891bb | 109 | static void read_loop(int fd, char *buf, size_t len); |
ff41a59f | 110 | |
c6816b94 WD |
111 | struct flist_ndx_item { |
112 | struct flist_ndx_item *next; | |
113 | int ndx; | |
d17e1dd2 WD |
114 | }; |
115 | ||
c6816b94 WD |
116 | struct flist_ndx_list { |
117 | struct flist_ndx_item *head, *tail; | |
118 | }; | |
119 | ||
cdf236aa | 120 | static struct flist_ndx_list redo_list, hlink_list; |
d17e1dd2 | 121 | |
08c88178 WD |
122 | struct msg_list_item { |
123 | struct msg_list_item *next; | |
d17e1dd2 WD |
124 | char *buf; |
125 | int len; | |
126 | }; | |
127 | ||
08c88178 WD |
128 | struct msg_list { |
129 | struct msg_list_item *head, *tail; | |
130 | }; | |
131 | ||
132 | static struct msg_list msg_list; | |
d17e1dd2 | 133 | |
c6816b94 | 134 | static void flist_ndx_push(struct flist_ndx_list *lp, int ndx) |
d17e1dd2 | 135 | { |
c6816b94 WD |
136 | struct flist_ndx_item *item; |
137 | ||
138 | if (!(item = new(struct flist_ndx_item))) | |
139 | out_of_memory("flist_ndx_push"); | |
140 | item->next = NULL; | |
141 | item->ndx = ndx; | |
142 | if (lp->tail) | |
143 | lp->tail->next = item; | |
d17e1dd2 | 144 | else |
c6816b94 WD |
145 | lp->head = item; |
146 | lp->tail = item; | |
147 | } | |
148 | ||
149 | static int flist_ndx_pop(struct flist_ndx_list *lp) | |
150 | { | |
151 | struct flist_ndx_item *next; | |
152 | int ndx; | |
153 | ||
154 | if (!lp->head) | |
155 | return -1; | |
156 | ||
157 | ndx = lp->head->ndx; | |
158 | next = lp->head->next; | |
159 | free(lp->head); | |
160 | lp->head = next; | |
161 | if (!next) | |
162 | lp->tail = NULL; | |
163 | ||
164 | return ndx; | |
d17e1dd2 WD |
165 | } |
166 | ||
8d9dc9f9 AT |
167 | static void check_timeout(void) |
168 | { | |
169 | time_t t; | |
90ba34e2 | 170 | |
9e2409ab | 171 | if (!io_timeout || ignore_timeout) |
d17e1dd2 | 172 | return; |
8d9dc9f9 | 173 | |
3b0a30eb WD |
174 | if (!last_io_in) { |
175 | last_io_in = time(NULL); | |
8d9dc9f9 AT |
176 | return; |
177 | } | |
178 | ||
179 | t = time(NULL); | |
180 | ||
3b0a30eb | 181 | if (t - last_io_in >= io_timeout) { |
0adb99b9 | 182 | if (!am_server && !am_daemon) { |
4ccfd96c | 183 | rprintf(FERROR, "io timeout after %d seconds -- exiting\n", |
3b0a30eb | 184 | (int)(t-last_io_in)); |
0adb99b9 | 185 | } |
65417579 | 186 | exit_cleanup(RERR_TIMEOUT); |
8d9dc9f9 AT |
187 | } |
188 | } | |
189 | ||
1f75bb10 WD |
190 | /* Note the fds used for the main socket (which might really be a pipe |
191 | * for a local transfer, but we can ignore that). */ | |
192 | void io_set_sock_fds(int f_in, int f_out) | |
193 | { | |
194 | sock_f_in = f_in; | |
195 | sock_f_out = f_out; | |
196 | } | |
197 | ||
3b0a30eb WD |
198 | void set_io_timeout(int secs) |
199 | { | |
200 | io_timeout = secs; | |
201 | ||
202 | if (!io_timeout || io_timeout > SELECT_TIMEOUT) | |
203 | select_timeout = SELECT_TIMEOUT; | |
204 | else | |
205 | select_timeout = io_timeout; | |
206 | ||
207 | allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2; | |
208 | } | |
209 | ||
98f8c9a5 WD |
210 | /* Setup the fd used to receive MSG_* messages. Only needed during the |
211 | * early stages of being a local sender (up through the sending of the | |
212 | * file list) or when we're the generator (to fetch the messages from | |
213 | * the receiver). */ | |
d17e1dd2 WD |
214 | void set_msg_fd_in(int fd) |
215 | { | |
216 | msg_fd_in = fd; | |
217 | } | |
218 | ||
98f8c9a5 WD |
219 | /* Setup the fd used to send our MSG_* messages. Only needed when |
220 | * we're the receiver (to send our messages to the generator). */ | |
d17e1dd2 WD |
221 | void set_msg_fd_out(int fd) |
222 | { | |
223 | msg_fd_out = fd; | |
224 | set_nonblocking(msg_fd_out); | |
225 | } | |
226 | ||
227 | /* Add a message to the pending MSG_* list. */ | |
228 | static void msg_list_add(int code, char *buf, int len) | |
554e0a8d | 229 | { |
08c88178 | 230 | struct msg_list_item *ml; |
d17e1dd2 | 231 | |
08c88178 | 232 | if (!(ml = new(struct msg_list_item))) |
c6816b94 | 233 | out_of_memory("msg_list_add"); |
d17e1dd2 WD |
234 | ml->next = NULL; |
235 | if (!(ml->buf = new_array(char, len+4))) | |
c6816b94 | 236 | out_of_memory("msg_list_add"); |
d17e1dd2 WD |
237 | SIVAL(ml->buf, 0, ((code+MPLEX_BASE)<<24) | len); |
238 | memcpy(ml->buf+4, buf, len); | |
239 | ml->len = len+4; | |
08c88178 WD |
240 | if (msg_list.tail) |
241 | msg_list.tail->next = ml; | |
d17e1dd2 | 242 | else |
08c88178 WD |
243 | msg_list.head = ml; |
244 | msg_list.tail = ml; | |
554e0a8d AT |
245 | } |
246 | ||
98f8c9a5 WD |
247 | /* Read a message from the MSG_* fd and handle it. This is called either |
248 | * during the early stages of being a local sender (up through the sending | |
249 | * of the file list) or when we're the generator (to fetch the messages | |
250 | * from the receiver). */ | |
d17e1dd2 | 251 | static void read_msg_fd(void) |
554e0a8d | 252 | { |
f9c6b3e7 | 253 | char buf[2048]; |
06ce139f | 254 | size_t n; |
d17e1dd2 | 255 | int fd = msg_fd_in; |
ff41a59f AT |
256 | int tag, len; |
257 | ||
00bdf899 | 258 | /* Temporarily disable msg_fd_in. This is needed to avoid looping back |
af436313 | 259 | * to this routine from writefd_unbuffered(). */ |
d17e1dd2 | 260 | msg_fd_in = -1; |
554e0a8d | 261 | |
ff41a59f AT |
262 | read_loop(fd, buf, 4); |
263 | tag = IVAL(buf, 0); | |
264 | ||
265 | len = tag & 0xFFFFFF; | |
d17e1dd2 | 266 | tag = (tag >> 24) - MPLEX_BASE; |
ff41a59f | 267 | |
d17e1dd2 WD |
268 | switch (tag) { |
269 | case MSG_DONE: | |
98f8c9a5 | 270 | if (len != 0 || !am_generator) { |
13c7bcbb | 271 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
d17e1dd2 | 272 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 273 | } |
c6816b94 | 274 | flist_ndx_push(&redo_list, -1); |
d17e1dd2 WD |
275 | break; |
276 | case MSG_REDO: | |
98f8c9a5 | 277 | if (len != 4 || !am_generator) { |
13c7bcbb | 278 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
d17e1dd2 | 279 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 280 | } |
d17e1dd2 | 281 | read_loop(fd, buf, 4); |
c6816b94 | 282 | flist_ndx_push(&redo_list, IVAL(buf,0)); |
d17e1dd2 | 283 | break; |
0d67e00a WD |
284 | case MSG_DELETED: |
285 | if (len >= (int)sizeof buf || !am_generator) { | |
286 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); | |
287 | exit_cleanup(RERR_STREAMIO); | |
288 | } | |
289 | read_loop(fd, buf, len); | |
290 | io_multiplex_write(MSG_DELETED, buf, len); | |
291 | break; | |
9981c27e WD |
292 | case MSG_SUCCESS: |
293 | if (len != 4 || !am_generator) { | |
294 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); | |
295 | exit_cleanup(RERR_STREAMIO); | |
296 | } | |
297 | read_loop(fd, buf, len); | |
cdf236aa WD |
298 | if (remove_sent_files) |
299 | io_multiplex_write(MSG_SUCCESS, buf, len); | |
300 | if (preserve_hard_links) | |
301 | flist_ndx_push(&hlink_list, IVAL(buf,0)); | |
9981c27e | 302 | break; |
d17e1dd2 WD |
303 | case MSG_INFO: |
304 | case MSG_ERROR: | |
305 | case MSG_LOG: | |
306 | while (len) { | |
307 | n = len; | |
308 | if (n >= sizeof buf) | |
309 | n = sizeof buf - 1; | |
310 | read_loop(fd, buf, n); | |
311 | rwrite((enum logcode)tag, buf, n); | |
312 | len -= n; | |
313 | } | |
314 | break; | |
315 | default: | |
13c7bcbb | 316 | rprintf(FERROR, "unknown message %d:%d\n", tag, len); |
d17e1dd2 WD |
317 | exit_cleanup(RERR_STREAMIO); |
318 | } | |
319 | ||
320 | msg_fd_in = fd; | |
321 | } | |
322 | ||
323 | /* Try to push messages off the list onto the wire. If we leave with more | |
324 | * to do, return 0. On error, return -1. If everything flushed, return 1. | |
f9c6b3e7 | 325 | * This is only active in the receiver. */ |
37f35d89 | 326 | static int msg_list_flush(int flush_it_all) |
d17e1dd2 WD |
327 | { |
328 | static int written = 0; | |
329 | struct timeval tv; | |
330 | fd_set fds; | |
331 | ||
332 | if (msg_fd_out < 0) | |
333 | return -1; | |
334 | ||
08c88178 WD |
335 | while (msg_list.head) { |
336 | struct msg_list_item *ml = msg_list.head; | |
d17e1dd2 WD |
337 | int n = write(msg_fd_out, ml->buf + written, ml->len - written); |
338 | if (n < 0) { | |
339 | if (errno == EINTR) | |
340 | continue; | |
341 | if (errno != EWOULDBLOCK && errno != EAGAIN) | |
342 | return -1; | |
343 | if (!flush_it_all) | |
344 | return 0; | |
345 | FD_ZERO(&fds); | |
346 | FD_SET(msg_fd_out, &fds); | |
e626b29e | 347 | tv.tv_sec = select_timeout; |
d17e1dd2 WD |
348 | tv.tv_usec = 0; |
349 | if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv)) | |
350 | check_timeout(); | |
351 | } else if ((written += n) == ml->len) { | |
352 | free(ml->buf); | |
08c88178 WD |
353 | msg_list.head = ml->next; |
354 | if (!msg_list.head) | |
355 | msg_list.tail = NULL; | |
d17e1dd2 WD |
356 | free(ml); |
357 | written = 0; | |
358 | } | |
554e0a8d | 359 | } |
d17e1dd2 WD |
360 | return 1; |
361 | } | |
362 | ||
37f35d89 WD |
363 | void send_msg(enum msgcode code, char *buf, int len) |
364 | { | |
365 | if (msg_fd_out < 0) { | |
366 | io_multiplex_write(code, buf, len); | |
367 | return; | |
368 | } | |
369 | msg_list_add(code, buf, len); | |
370 | msg_list_flush(NORMAL_FLUSH); | |
371 | } | |
372 | ||
cdf236aa | 373 | int get_redo_num(int itemizing, enum logcode code) |
d17e1dd2 | 374 | { |
cdf236aa WD |
375 | while (1) { |
376 | if (hlink_list.head) | |
377 | check_for_finished_hlinks(itemizing, code); | |
378 | if (redo_list.head) | |
379 | break; | |
d17e1dd2 | 380 | read_msg_fd(); |
c6816b94 | 381 | } |
554e0a8d | 382 | |
c6816b94 | 383 | return flist_ndx_pop(&redo_list); |
554e0a8d AT |
384 | } |
385 | ||
cdf236aa WD |
386 | int get_hlink_num(void) |
387 | { | |
388 | return flist_ndx_pop(&hlink_list); | |
389 | } | |
390 | ||
56014c8c WD |
391 | /** |
392 | * When we're the receiver and we have a local --files-from list of names | |
393 | * that needs to be sent over the socket to the sender, we have to do two | |
394 | * things at the same time: send the sender a list of what files we're | |
395 | * processing and read the incoming file+info list from the sender. We do | |
396 | * this by augmenting the read_timeout() function to copy this data. It | |
397 | * uses the io_filesfrom_buf to read a block of data from f_in (when it is | |
398 | * ready, since it might be a pipe) and then blast it out f_out (when it | |
399 | * is ready to receive more data). | |
400 | */ | |
401 | void io_set_filesfrom_fds(int f_in, int f_out) | |
402 | { | |
403 | io_filesfrom_f_in = f_in; | |
404 | io_filesfrom_f_out = f_out; | |
405 | io_filesfrom_bp = io_filesfrom_buf; | |
406 | io_filesfrom_lastchar = '\0'; | |
407 | io_filesfrom_buflen = 0; | |
408 | } | |
720b47f2 | 409 | |
cb2e1f18 WD |
410 | /* It's almost always an error to get an EOF when we're trying to read from the |
411 | * network, because the protocol is (for the most part) self-terminating. | |
880da007 | 412 | * |
cb2e1f18 WD |
413 | * There is one case for the receiver when it is at the end of the transfer |
414 | * (hanging around reading any keep-alive packets that might come its way): if | |
415 | * the sender dies before the generator's kill-signal comes through, we can end | |
416 | * up here needing to loop until the kill-signal arrives. In this situation, | |
417 | * kluge_around_eof will be < 0. | |
418 | * | |
419 | * There is another case for older protocol versions (< 24) where the module | |
420 | * listing was not terminated, so we must ignore an EOF error in that case and | |
421 | * exit. In this situation, kluge_around_eof will be > 0. */ | |
1f75bb10 | 422 | static void whine_about_eof(int fd) |
7a55d06e | 423 | { |
574c2500 | 424 | if (kluge_around_eof && fd == sock_f_in) { |
55bb7fff | 425 | int i; |
574c2500 WD |
426 | if (kluge_around_eof > 0) |
427 | exit_cleanup(0); | |
55bb7fff WD |
428 | /* If we're still here after 10 seconds, exit with an error. */ |
429 | for (i = 10*1000/20; i--; ) | |
574c2500 WD |
430 | msleep(20); |
431 | } | |
3151cbae | 432 | |
00bdf899 | 433 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
dca68b0a WD |
434 | "(%.0f bytes received so far) [%s]\n", |
435 | (double)stats.total_read, who_am_i()); | |
00bdf899 WD |
436 | |
437 | exit_cleanup(RERR_STREAMIO); | |
7a55d06e | 438 | } |
720b47f2 | 439 | |
7a55d06e | 440 | |
880da007 | 441 | /** |
6ed6d7f5 | 442 | * Read from a socket with I/O timeout. return the number of bytes |
c3563c46 MP |
443 | * read. If no bytes can be read then exit, never return a number <= 0. |
444 | * | |
8886f8d0 MP |
445 | * TODO: If the remote shell connection fails, then current versions |
446 | * actually report an "unexpected EOF" error here. Since it's a | |
447 | * fairly common mistake to try to use rsh when ssh is required, we | |
448 | * should trap that: if we fail to read any data at all, we should | |
449 | * give a better explanation. We can tell whether the connection has | |
450 | * started by looking e.g. at whether the remote version is known yet. | |
c3563c46 | 451 | */ |
3151cbae | 452 | static int read_timeout(int fd, char *buf, size_t len) |
8d9dc9f9 | 453 | { |
d62bcc17 | 454 | int n, ret = 0; |
4c36ddbe | 455 | |
d17e1dd2 | 456 | io_flush(NORMAL_FLUSH); |
ea2111d1 | 457 | |
4c36ddbe | 458 | while (ret == 0) { |
7a55d06e | 459 | /* until we manage to read *something* */ |
56014c8c | 460 | fd_set r_fds, w_fds; |
4c36ddbe | 461 | struct timeval tv; |
1ea087a7 | 462 | int maxfd = fd; |
a57873b7 | 463 | int count; |
4c36ddbe | 464 | |
56014c8c | 465 | FD_ZERO(&r_fds); |
a7026ba9 | 466 | FD_ZERO(&w_fds); |
56014c8c | 467 | FD_SET(fd, &r_fds); |
08c88178 | 468 | if (msg_list.head) { |
4033b80b | 469 | FD_SET(msg_fd_out, &w_fds); |
1ea087a7 WD |
470 | if (msg_fd_out > maxfd) |
471 | maxfd = msg_fd_out; | |
56014c8c | 472 | } |
3309507d | 473 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
474 | int new_fd; |
475 | if (io_filesfrom_buflen == 0) { | |
3309507d | 476 | if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
477 | FD_SET(io_filesfrom_f_in, &r_fds); |
478 | new_fd = io_filesfrom_f_in; | |
479 | } else { | |
480 | io_filesfrom_f_out = -1; | |
481 | new_fd = -1; | |
482 | } | |
483 | } else { | |
56014c8c WD |
484 | FD_SET(io_filesfrom_f_out, &w_fds); |
485 | new_fd = io_filesfrom_f_out; | |
486 | } | |
1ea087a7 WD |
487 | if (new_fd > maxfd) |
488 | maxfd = new_fd; | |
554e0a8d AT |
489 | } |
490 | ||
e626b29e | 491 | tv.tv_sec = select_timeout; |
4c36ddbe AT |
492 | tv.tv_usec = 0; |
493 | ||
554e0a8d AT |
494 | errno = 0; |
495 | ||
a7026ba9 | 496 | count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); |
a57873b7 | 497 | |
a57873b7 | 498 | if (count <= 0) { |
f89b9368 | 499 | if (errno == EBADF) |
554e0a8d | 500 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 501 | check_timeout(); |
4c36ddbe AT |
502 | continue; |
503 | } | |
504 | ||
08c88178 | 505 | if (msg_list.head && FD_ISSET(msg_fd_out, &w_fds)) |
37f35d89 | 506 | msg_list_flush(NORMAL_FLUSH); |
554e0a8d | 507 | |
3309507d | 508 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
509 | if (io_filesfrom_buflen) { |
510 | if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { | |
511 | int l = write(io_filesfrom_f_out, | |
512 | io_filesfrom_bp, | |
513 | io_filesfrom_buflen); | |
514 | if (l > 0) { | |
515 | if (!(io_filesfrom_buflen -= l)) | |
516 | io_filesfrom_bp = io_filesfrom_buf; | |
517 | else | |
518 | io_filesfrom_bp += l; | |
519 | } else { | |
520 | /* XXX should we complain? */ | |
521 | io_filesfrom_f_out = -1; | |
522 | } | |
523 | } | |
3309507d | 524 | } else if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
525 | if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { |
526 | int l = read(io_filesfrom_f_in, | |
527 | io_filesfrom_buf, | |
528 | sizeof io_filesfrom_buf); | |
529 | if (l <= 0) { | |
530 | /* Send end-of-file marker */ | |
531 | io_filesfrom_buf[0] = '\0'; | |
532 | io_filesfrom_buf[1] = '\0'; | |
533 | io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1; | |
534 | io_filesfrom_f_in = -1; | |
535 | } else { | |
56014c8c WD |
536 | if (!eol_nulls) { |
537 | char *s = io_filesfrom_buf + l; | |
538 | /* Transform CR and/or LF into '\0' */ | |
539 | while (s-- > io_filesfrom_buf) { | |
540 | if (*s == '\n' || *s == '\r') | |
541 | *s = '\0'; | |
542 | } | |
543 | } | |
544 | if (!io_filesfrom_lastchar) { | |
545 | /* Last buf ended with a '\0', so don't | |
546 | * let this buf start with one. */ | |
547 | while (l && !*io_filesfrom_bp) | |
548 | io_filesfrom_bp++, l--; | |
549 | } | |
550 | if (!l) | |
551 | io_filesfrom_bp = io_filesfrom_buf; | |
552 | else { | |
553 | char *f = io_filesfrom_bp; | |
554 | char *t = f; | |
555 | char *eob = f + l; | |
556 | /* Eliminate any multi-'\0' runs. */ | |
557 | while (f != eob) { | |
558 | if (!(*t++ = *f++)) { | |
559 | while (f != eob && !*f) | |
560 | f++, l--; | |
561 | } | |
562 | } | |
563 | io_filesfrom_lastchar = f[-1]; | |
564 | } | |
565 | io_filesfrom_buflen = l; | |
566 | } | |
567 | } | |
568 | } | |
569 | } | |
570 | ||
f89b9368 WD |
571 | if (!FD_ISSET(fd, &r_fds)) |
572 | continue; | |
554e0a8d | 573 | |
4c36ddbe AT |
574 | n = read(fd, buf, len); |
575 | ||
1ea087a7 WD |
576 | if (n <= 0) { |
577 | if (n == 0) | |
1f75bb10 | 578 | whine_about_eof(fd); /* Doesn't return. */ |
d62bcc17 WD |
579 | if (errno == EINTR || errno == EWOULDBLOCK |
580 | || errno == EAGAIN) | |
7a55d06e | 581 | continue; |
1f75bb10 WD |
582 | |
583 | /* Don't write errors on a dead socket. */ | |
584 | if (fd == sock_f_in) | |
7f459268 | 585 | close_multiplexing_out(); |
1f75bb10 WD |
586 | rsyserr(FERROR, errno, "read error"); |
587 | exit_cleanup(RERR_STREAMIO); | |
8d9dc9f9 | 588 | } |
00bdf899 WD |
589 | |
590 | buf += n; | |
591 | len -= n; | |
592 | ret += n; | |
1f75bb10 | 593 | |
3b0a30eb WD |
594 | if (fd == sock_f_in && io_timeout) |
595 | last_io_in = time(NULL); | |
4c36ddbe | 596 | } |
8d9dc9f9 | 597 | |
4c36ddbe AT |
598 | return ret; |
599 | } | |
8d9dc9f9 | 600 | |
56014c8c WD |
601 | /** |
602 | * Read a line into the "fname" buffer (which must be at least MAXPATHLEN | |
603 | * characters long). | |
604 | */ | |
605 | int read_filesfrom_line(int fd, char *fname) | |
606 | { | |
607 | char ch, *s, *eob = fname + MAXPATHLEN - 1; | |
608 | int cnt; | |
d19320fd | 609 | int reading_remotely = filesfrom_host != NULL; |
56014c8c WD |
610 | int nulls = eol_nulls || reading_remotely; |
611 | ||
612 | start: | |
613 | s = fname; | |
614 | while (1) { | |
615 | cnt = read(fd, &ch, 1); | |
616 | if (cnt < 0 && (errno == EWOULDBLOCK | |
617 | || errno == EINTR || errno == EAGAIN)) { | |
618 | struct timeval tv; | |
619 | fd_set fds; | |
620 | FD_ZERO(&fds); | |
621 | FD_SET(fd, &fds); | |
e626b29e | 622 | tv.tv_sec = select_timeout; |
56014c8c WD |
623 | tv.tv_usec = 0; |
624 | if (!select(fd+1, &fds, NULL, NULL, &tv)) | |
625 | check_timeout(); | |
626 | continue; | |
627 | } | |
628 | if (cnt != 1) | |
629 | break; | |
630 | if (nulls? !ch : (ch == '\r' || ch == '\n')) { | |
631 | /* Skip empty lines if reading locally. */ | |
632 | if (!reading_remotely && s == fname) | |
633 | continue; | |
634 | break; | |
635 | } | |
636 | if (s < eob) | |
637 | *s++ = ch; | |
638 | } | |
639 | *s = '\0'; | |
7a55d06e | 640 | |
6b45fcf1 WD |
641 | /* Dump comments. */ |
642 | if (*fname == '#' || *fname == ';') | |
56014c8c WD |
643 | goto start; |
644 | ||
645 | return s - fname; | |
646 | } | |
7a55d06e MP |
647 | |
648 | ||
1f75bb10 WD |
649 | static char *iobuf_out; |
650 | static int iobuf_out_cnt; | |
651 | ||
652 | void io_start_buffering_out(void) | |
653 | { | |
654 | if (iobuf_out) | |
655 | return; | |
656 | if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) | |
657 | out_of_memory("io_start_buffering_out"); | |
658 | iobuf_out_cnt = 0; | |
659 | } | |
660 | ||
661 | ||
662 | static char *iobuf_in; | |
663 | static size_t iobuf_in_siz; | |
664 | ||
665 | void io_start_buffering_in(void) | |
666 | { | |
667 | if (iobuf_in) | |
668 | return; | |
669 | iobuf_in_siz = 2 * IO_BUFFER_SIZE; | |
670 | if (!(iobuf_in = new_array(char, iobuf_in_siz))) | |
671 | out_of_memory("io_start_buffering_in"); | |
672 | } | |
673 | ||
674 | ||
675 | void io_end_buffering(void) | |
676 | { | |
677 | io_flush(NORMAL_FLUSH); | |
678 | if (!io_multiplexing_out) { | |
679 | free(iobuf_out); | |
680 | iobuf_out = NULL; | |
681 | } | |
682 | } | |
683 | ||
684 | ||
626bec8e WD |
685 | void maybe_flush_socket(void) |
686 | { | |
3b0a30eb | 687 | if (iobuf_out && iobuf_out_cnt && time(NULL) - last_io_out >= 5) |
626bec8e WD |
688 | io_flush(NORMAL_FLUSH); |
689 | } | |
690 | ||
691 | ||
cdf236aa | 692 | void maybe_send_keepalive(void) |
9e2409ab | 693 | { |
3b0a30eb | 694 | if (time(NULL) - last_io_out >= allowed_lull) { |
9e2409ab | 695 | if (!iobuf_out || !iobuf_out_cnt) { |
3221f451 WD |
696 | if (protocol_version < 29) |
697 | return; /* there's nothing we can do */ | |
cdf236aa | 698 | write_int(sock_f_out, the_file_list->count); |
9e2409ab WD |
699 | write_shortint(sock_f_out, ITEM_IS_NEW); |
700 | } | |
701 | if (iobuf_out) | |
702 | io_flush(NORMAL_FLUSH); | |
703 | } | |
704 | } | |
705 | ||
706 | ||
880da007 MP |
707 | /** |
708 | * Continue trying to read len bytes - don't return until len has been | |
709 | * read. | |
710 | **/ | |
3151cbae | 711 | static void read_loop(int fd, char *buf, size_t len) |
4c36ddbe AT |
712 | { |
713 | while (len) { | |
714 | int n = read_timeout(fd, buf, len); | |
715 | ||
716 | buf += n; | |
717 | len -= n; | |
8d9dc9f9 AT |
718 | } |
719 | } | |
720 | ||
7a55d06e MP |
721 | |
722 | /** | |
723 | * Read from the file descriptor handling multiplexing - return number | |
724 | * of bytes read. | |
d62bcc17 WD |
725 | * |
726 | * Never returns <= 0. | |
7a55d06e | 727 | */ |
c399d22a | 728 | static int readfd_unbuffered(int fd, char *buf, size_t len) |
8d9dc9f9 | 729 | { |
6fe25398 | 730 | static size_t remaining; |
1f75bb10 | 731 | static size_t iobuf_in_ndx; |
f2a4853c | 732 | size_t msg_bytes; |
909ce14f | 733 | int tag, ret = 0; |
33544bf4 | 734 | char line[BIGPATHBUFLEN]; |
8d9dc9f9 | 735 | |
1f75bb10 | 736 | if (!iobuf_in || fd != sock_f_in) |
4c36ddbe | 737 | return read_timeout(fd, buf, len); |
8d9dc9f9 | 738 | |
76c21947 | 739 | if (!io_multiplexing_in && remaining == 0) { |
1f75bb10 WD |
740 | remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); |
741 | iobuf_in_ndx = 0; | |
76c21947 WD |
742 | } |
743 | ||
8d9dc9f9 AT |
744 | while (ret == 0) { |
745 | if (remaining) { | |
746 | len = MIN(len, remaining); | |
1f75bb10 WD |
747 | memcpy(buf, iobuf_in + iobuf_in_ndx, len); |
748 | iobuf_in_ndx += len; | |
8d9dc9f9 AT |
749 | remaining -= len; |
750 | ret = len; | |
76c21947 | 751 | break; |
8d9dc9f9 AT |
752 | } |
753 | ||
909ce14f | 754 | read_loop(fd, line, 4); |
ff41a59f | 755 | tag = IVAL(line, 0); |
679e7657 | 756 | |
f2a4853c | 757 | msg_bytes = tag & 0xFFFFFF; |
d17e1dd2 | 758 | tag = (tag >> 24) - MPLEX_BASE; |
8d9dc9f9 | 759 | |
d17e1dd2 WD |
760 | switch (tag) { |
761 | case MSG_DATA: | |
f2a4853c | 762 | if (msg_bytes > iobuf_in_siz) { |
1f75bb10 | 763 | if (!(iobuf_in = realloc_array(iobuf_in, char, |
f2a4853c | 764 | msg_bytes))) |
c399d22a | 765 | out_of_memory("readfd_unbuffered"); |
f2a4853c | 766 | iobuf_in_siz = msg_bytes; |
76c21947 | 767 | } |
f2a4853c WD |
768 | read_loop(fd, iobuf_in, msg_bytes); |
769 | remaining = msg_bytes; | |
1f75bb10 | 770 | iobuf_in_ndx = 0; |
d17e1dd2 | 771 | break; |
0d67e00a | 772 | case MSG_DELETED: |
f2a4853c WD |
773 | if (msg_bytes >= sizeof line) |
774 | goto overflow; | |
775 | read_loop(fd, line, msg_bytes); | |
776 | line[msg_bytes] = '\0'; | |
0d67e00a | 777 | /* A directory name was sent with the trailing null */ |
f2a4853c | 778 | if (msg_bytes > 0 && !line[msg_bytes-1]) |
0d67e00a WD |
779 | log_delete(line, S_IFDIR); |
780 | else | |
781 | log_delete(line, S_IFREG); | |
0d67e00a | 782 | break; |
9981c27e | 783 | case MSG_SUCCESS: |
f2a4853c | 784 | if (msg_bytes != 4) { |
cdf236aa | 785 | rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n", |
f2a4853c | 786 | tag, (long)msg_bytes, who_am_i()); |
9981c27e WD |
787 | exit_cleanup(RERR_STREAMIO); |
788 | } | |
f2a4853c | 789 | read_loop(fd, line, msg_bytes); |
9981c27e | 790 | successful_send(IVAL(line, 0)); |
9981c27e | 791 | break; |
d17e1dd2 WD |
792 | case MSG_INFO: |
793 | case MSG_ERROR: | |
f2a4853c WD |
794 | if (msg_bytes >= sizeof line) { |
795 | overflow: | |
bd9fca47 | 796 | rprintf(FERROR, |
cdf236aa | 797 | "multiplexing overflow %d:%ld [%s]\n", |
f2a4853c | 798 | tag, (long)msg_bytes, who_am_i()); |
d17e1dd2 WD |
799 | exit_cleanup(RERR_STREAMIO); |
800 | } | |
f2a4853c WD |
801 | read_loop(fd, line, msg_bytes); |
802 | rwrite((enum logcode)tag, line, msg_bytes); | |
d17e1dd2 WD |
803 | break; |
804 | default: | |
cdf236aa WD |
805 | rprintf(FERROR, "unexpected tag %d [%s]\n", |
806 | tag, who_am_i()); | |
65417579 | 807 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 808 | } |
8d9dc9f9 AT |
809 | } |
810 | ||
76c21947 | 811 | if (remaining == 0) |
d17e1dd2 | 812 | io_flush(NORMAL_FLUSH); |
76c21947 | 813 | |
8d9dc9f9 AT |
814 | return ret; |
815 | } | |
816 | ||
817 | ||
909ce14f | 818 | |
880da007 MP |
819 | /** |
820 | * Do a buffered read from @p fd. Don't return until all @p n bytes | |
821 | * have been read. If all @p n can't be read then exit with an | |
822 | * error. | |
823 | **/ | |
3151cbae | 824 | static void readfd(int fd, char *buffer, size_t N) |
720b47f2 | 825 | { |
6ba9279f | 826 | int ret; |
d62bcc17 | 827 | size_t total = 0; |
3151cbae | 828 | |
6ba9279f | 829 | while (total < N) { |
c399d22a | 830 | ret = readfd_unbuffered(fd, buffer + total, N-total); |
6ba9279f | 831 | total += ret; |
7f28dbee | 832 | } |
1b7c47cb | 833 | |
b9f592fb WD |
834 | if (fd == write_batch_monitor_in) { |
835 | if ((size_t)write(batch_fd, buffer, total) != total) | |
836 | exit_cleanup(RERR_FILEIO); | |
837 | } | |
1f75bb10 WD |
838 | |
839 | if (fd == sock_f_in) | |
840 | stats.total_read += total; | |
720b47f2 AT |
841 | } |
842 | ||
843 | ||
0d67e00a | 844 | int read_shortint(int f) |
9361f839 WD |
845 | { |
846 | uchar b[2]; | |
847 | readfd(f, (char *)b, 2); | |
848 | return (b[1] << 8) + b[0]; | |
849 | } | |
850 | ||
851 | ||
b7922338 | 852 | int32 read_int(int f) |
720b47f2 | 853 | { |
4c36ddbe | 854 | char b[4]; |
d730b113 AT |
855 | int32 ret; |
856 | ||
4c36ddbe | 857 | readfd(f,b,4); |
d730b113 | 858 | ret = IVAL(b,0); |
f89b9368 WD |
859 | if (ret == (int32)0xffffffff) |
860 | return -1; | |
d730b113 | 861 | return ret; |
720b47f2 AT |
862 | } |
863 | ||
71c46176 | 864 | int64 read_longint(int f) |
3a6a366f | 865 | { |
71c46176 | 866 | int64 ret; |
3a6a366f AT |
867 | char b[8]; |
868 | ret = read_int(f); | |
71c46176 | 869 | |
f89b9368 | 870 | if ((int32)ret != (int32)0xffffffff) |
8de330a3 | 871 | return ret; |
71c46176 | 872 | |
031fa9ad WD |
873 | #if SIZEOF_INT64 < 8 |
874 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
875 | exit_cleanup(RERR_UNSUPPORTED); | |
876 | #else | |
91c4da3f S |
877 | readfd(f,b,8); |
878 | ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); | |
031fa9ad | 879 | #endif |
71c46176 | 880 | |
3a6a366f AT |
881 | return ret; |
882 | } | |
883 | ||
9dd891bb | 884 | void read_buf(int f,char *buf,size_t len) |
720b47f2 | 885 | { |
4c36ddbe | 886 | readfd(f,buf,len); |
720b47f2 AT |
887 | } |
888 | ||
9dd891bb | 889 | void read_sbuf(int f,char *buf,size_t len) |
575f2fca | 890 | { |
93095cbe | 891 | readfd(f, buf, len); |
af436313 | 892 | buf[len] = '\0'; |
575f2fca AT |
893 | } |
894 | ||
9361f839 | 895 | uchar read_byte(int f) |
182dca5c | 896 | { |
9361f839 | 897 | uchar c; |
93095cbe | 898 | readfd(f, (char *)&c, 1); |
4c36ddbe | 899 | return c; |
182dca5c | 900 | } |
720b47f2 | 901 | |
46e99b09 WD |
902 | int read_vstring(int f, char *buf, int bufsize) |
903 | { | |
904 | int len = read_byte(f); | |
905 | ||
906 | if (len & 0x80) | |
907 | len = (len & ~0x80) * 0x100 + read_byte(f); | |
908 | ||
909 | if (len >= bufsize) { | |
910 | rprintf(FERROR, "over-long vstring received (%d > %d)\n", | |
911 | len, bufsize - 1); | |
9a6ed83f | 912 | return -1; |
46e99b09 WD |
913 | } |
914 | ||
915 | if (len) | |
916 | readfd(f, buf, len); | |
917 | buf[len] = '\0'; | |
918 | return len; | |
919 | } | |
920 | ||
188fed95 WD |
921 | /* Populate a sum_struct with values from the socket. This is |
922 | * called by both the sender and the receiver. */ | |
923 | void read_sum_head(int f, struct sum_struct *sum) | |
924 | { | |
925 | sum->count = read_int(f); | |
926 | sum->blength = read_int(f); | |
927 | if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { | |
cdf236aa WD |
928 | rprintf(FERROR, "Invalid block length %ld [%s]\n", |
929 | (long)sum->blength, who_am_i()); | |
188fed95 WD |
930 | exit_cleanup(RERR_PROTOCOL); |
931 | } | |
932 | sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); | |
933 | if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) { | |
cdf236aa WD |
934 | rprintf(FERROR, "Invalid checksum length %d [%s]\n", |
935 | sum->s2length, who_am_i()); | |
188fed95 WD |
936 | exit_cleanup(RERR_PROTOCOL); |
937 | } | |
938 | sum->remainder = read_int(f); | |
939 | if (sum->remainder < 0 || sum->remainder > sum->blength) { | |
cdf236aa WD |
940 | rprintf(FERROR, "Invalid remainder length %ld [%s]\n", |
941 | (long)sum->remainder, who_am_i()); | |
188fed95 WD |
942 | exit_cleanup(RERR_PROTOCOL); |
943 | } | |
944 | } | |
945 | ||
c207d7ec WD |
946 | /* Send the values from a sum_struct over the socket. Set sum to |
947 | * NULL if there are no checksums to send. This is called by both | |
948 | * the generator and the sender. */ | |
949 | void write_sum_head(int f, struct sum_struct *sum) | |
950 | { | |
951 | static struct sum_struct null_sum; | |
952 | ||
953 | if (sum == NULL) | |
954 | sum = &null_sum; | |
955 | ||
956 | write_int(f, sum->count); | |
957 | write_int(f, sum->blength); | |
958 | if (protocol_version >= 27) | |
959 | write_int(f, sum->s2length); | |
960 | write_int(f, sum->remainder); | |
961 | } | |
962 | ||
880da007 | 963 | |
08571358 MP |
964 | /** |
965 | * Sleep after writing to limit I/O bandwidth usage. | |
966 | * | |
967 | * @todo Rather than sleeping after each write, it might be better to | |
968 | * use some kind of averaging. The current algorithm seems to always | |
969 | * use a bit less bandwidth than specified, because it doesn't make up | |
970 | * for slow periods. But arguably this is a feature. In addition, we | |
971 | * ought to take the time used to write the data into account. | |
71e58630 WD |
972 | * |
973 | * During some phases of big transfers (file FOO is uptodate) this is | |
974 | * called with a small bytes_written every time. As the kernel has to | |
975 | * round small waits up to guarantee that we actually wait at least the | |
976 | * requested number of microseconds, this can become grossly inaccurate. | |
977 | * We therefore keep track of the bytes we've written over time and only | |
978 | * sleep when the accumulated delay is at least 1 tenth of a second. | |
08571358 MP |
979 | **/ |
980 | static void sleep_for_bwlimit(int bytes_written) | |
981 | { | |
71e58630 WD |
982 | static struct timeval prior_tv; |
983 | static long total_written = 0; | |
984 | struct timeval tv, start_tv; | |
985 | long elapsed_usec, sleep_usec; | |
986 | ||
987 | #define ONE_SEC 1000000L /* # of microseconds in a second */ | |
08571358 MP |
988 | |
989 | if (!bwlimit) | |
990 | return; | |
e681e820 | 991 | |
71e58630 WD |
992 | total_written += bytes_written; |
993 | ||
994 | gettimeofday(&start_tv, NULL); | |
995 | if (prior_tv.tv_sec) { | |
996 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC | |
997 | + (start_tv.tv_usec - prior_tv.tv_usec); | |
998 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); | |
999 | if (total_written < 0) | |
1000 | total_written = 0; | |
1001 | } | |
3151cbae | 1002 | |
71e58630 WD |
1003 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
1004 | if (sleep_usec < ONE_SEC / 10) { | |
1005 | prior_tv = start_tv; | |
1006 | return; | |
1007 | } | |
08571358 | 1008 | |
71e58630 WD |
1009 | tv.tv_sec = sleep_usec / ONE_SEC; |
1010 | tv.tv_usec = sleep_usec % ONE_SEC; | |
98b332ed | 1011 | select(0, NULL, NULL, NULL, &tv); |
71e58630 WD |
1012 | |
1013 | gettimeofday(&prior_tv, NULL); | |
1014 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC | |
1015 | + (prior_tv.tv_usec - start_tv.tv_usec); | |
1016 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); | |
08571358 MP |
1017 | } |
1018 | ||
1019 | ||
1f75bb10 | 1020 | /* Write len bytes to the file descriptor fd, looping as necessary to get |
0fb2fc4a | 1021 | * the job done and also (in certain circumstances) reading any data on |
af436313 | 1022 | * msg_fd_in to avoid deadlock. |
880da007 MP |
1023 | * |
1024 | * This function underlies the multiplexing system. The body of the | |
1f75bb10 | 1025 | * application never calls this function directly. */ |
9dd891bb | 1026 | static void writefd_unbuffered(int fd,char *buf,size_t len) |
720b47f2 | 1027 | { |
1ea087a7 | 1028 | size_t n, total = 0; |
8d9dc9f9 | 1029 | fd_set w_fds, r_fds; |
3eeac9bc | 1030 | int maxfd, count, ret, using_r_fds; |
8d9dc9f9 | 1031 | struct timeval tv; |
720b47f2 | 1032 | |
e44f9a12 AT |
1033 | no_flush++; |
1034 | ||
4c36ddbe | 1035 | while (total < len) { |
8d9dc9f9 | 1036 | FD_ZERO(&w_fds); |
8d9dc9f9 | 1037 | FD_SET(fd,&w_fds); |
1ea087a7 | 1038 | maxfd = fd; |
4c36ddbe | 1039 | |
af436313 | 1040 | if (msg_fd_in >= 0 && len-total >= contiguous_write_len) { |
56014c8c | 1041 | FD_ZERO(&r_fds); |
d17e1dd2 | 1042 | FD_SET(msg_fd_in,&r_fds); |
1ea087a7 WD |
1043 | if (msg_fd_in > maxfd) |
1044 | maxfd = msg_fd_in; | |
3eeac9bc WD |
1045 | using_r_fds = 1; |
1046 | } else | |
1047 | using_r_fds = 0; | |
8d9dc9f9 | 1048 | |
e626b29e | 1049 | tv.tv_sec = select_timeout; |
8d9dc9f9 | 1050 | tv.tv_usec = 0; |
4c36ddbe | 1051 | |
554e0a8d | 1052 | errno = 0; |
3eeac9bc | 1053 | count = select(maxfd + 1, using_r_fds ? &r_fds : NULL, |
d17e1dd2 | 1054 | &w_fds, NULL, &tv); |
4c36ddbe AT |
1055 | |
1056 | if (count <= 0) { | |
1ea087a7 | 1057 | if (count < 0 && errno == EBADF) |
554e0a8d | 1058 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 1059 | check_timeout(); |
8d9dc9f9 AT |
1060 | continue; |
1061 | } | |
4c36ddbe | 1062 | |
3eeac9bc | 1063 | if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds)) |
d17e1dd2 | 1064 | read_msg_fd(); |
554e0a8d | 1065 | |
9a6ed83f | 1066 | if (!FD_ISSET(fd, &w_fds)) |
1ea087a7 | 1067 | continue; |
4c36ddbe | 1068 | |
1ea087a7 WD |
1069 | n = len - total; |
1070 | if (bwlimit && n > bwlimit_writemax) | |
1071 | n = bwlimit_writemax; | |
1072 | ret = write(fd, buf + total, n); | |
1073 | ||
1074 | if (ret <= 0) { | |
3309507d WD |
1075 | if (ret < 0) { |
1076 | if (errno == EINTR) | |
1077 | continue; | |
1078 | if (errno == EWOULDBLOCK || errno == EAGAIN) { | |
1079 | msleep(1); | |
1080 | continue; | |
1081 | } | |
f0359dd0 AT |
1082 | } |
1083 | ||
1ea087a7 | 1084 | /* Don't try to write errors back across the stream. */ |
1f75bb10 | 1085 | if (fd == sock_f_out) |
7f459268 | 1086 | close_multiplexing_out(); |
1ea087a7 | 1087 | rsyserr(FERROR, errno, |
dca68b0a WD |
1088 | "writefd_unbuffered failed to write %ld bytes: phase \"%s\" [%s]", |
1089 | (long)len, io_write_phase, who_am_i()); | |
d1b31da7 WD |
1090 | /* If the other side is sending us error messages, try |
1091 | * to grab any messages they sent before they died. */ | |
7f459268 | 1092 | while (fd == sock_f_out && io_multiplexing_in) { |
3b0a30eb | 1093 | set_io_timeout(30); |
9e2409ab | 1094 | ignore_timeout = 0; |
d1b31da7 WD |
1095 | readfd_unbuffered(sock_f_in, io_filesfrom_buf, |
1096 | sizeof io_filesfrom_buf); | |
1097 | } | |
1ea087a7 WD |
1098 | exit_cleanup(RERR_STREAMIO); |
1099 | } | |
4c36ddbe | 1100 | |
1ea087a7 | 1101 | total += ret; |
a800434a | 1102 | |
1f75bb10 | 1103 | if (fd == sock_f_out) { |
626bec8e | 1104 | if (io_timeout || am_generator) |
3b0a30eb | 1105 | last_io_out = time(NULL); |
1f75bb10 WD |
1106 | sleep_for_bwlimit(ret); |
1107 | } | |
4c36ddbe | 1108 | } |
e44f9a12 AT |
1109 | |
1110 | no_flush--; | |
720b47f2 AT |
1111 | } |
1112 | ||
8d9dc9f9 | 1113 | |
880da007 MP |
1114 | /** |
1115 | * Write an message to a multiplexed stream. If this fails then rsync | |
1116 | * exits. | |
1117 | **/ | |
1f75bb10 | 1118 | static void mplex_write(enum msgcode code, char *buf, size_t len) |
ff41a59f | 1119 | { |
33544bf4 | 1120 | char buffer[BIGPATHBUFLEN]; |
06ce139f | 1121 | size_t n = len; |
8d9dc9f9 | 1122 | |
ff41a59f AT |
1123 | SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); |
1124 | ||
af436313 WD |
1125 | /* When the generator reads messages from the msg_fd_in pipe, it can |
1126 | * cause output to occur down the socket. Setting contiguous_write_len | |
1127 | * prevents the reading of msg_fd_in once we actually start to write | |
1128 | * this sequence of data (though we might read it before the start). */ | |
1129 | if (am_generator && msg_fd_in >= 0) | |
1130 | contiguous_write_len = len + 4; | |
1131 | ||
c399d22a | 1132 | if (n > sizeof buffer - 4) |
3151cbae | 1133 | n = sizeof buffer - 4; |
ff41a59f AT |
1134 | |
1135 | memcpy(&buffer[4], buf, n); | |
1f75bb10 | 1136 | writefd_unbuffered(sock_f_out, buffer, n+4); |
ff41a59f AT |
1137 | |
1138 | len -= n; | |
1139 | buf += n; | |
1140 | ||
1ea087a7 | 1141 | if (len) |
1f75bb10 | 1142 | writefd_unbuffered(sock_f_out, buf, len); |
af436313 WD |
1143 | |
1144 | if (am_generator && msg_fd_in >= 0) | |
1145 | contiguous_write_len = 0; | |
d6dead6b AT |
1146 | } |
1147 | ||
ff41a59f | 1148 | |
d17e1dd2 | 1149 | void io_flush(int flush_it_all) |
d6dead6b | 1150 | { |
37f35d89 | 1151 | msg_list_flush(flush_it_all); |
90ba34e2 | 1152 | |
1f75bb10 | 1153 | if (!iobuf_out_cnt || no_flush) |
d17e1dd2 | 1154 | return; |
8d9dc9f9 | 1155 | |
d17e1dd2 | 1156 | if (io_multiplexing_out) |
1f75bb10 | 1157 | mplex_write(MSG_DATA, iobuf_out, iobuf_out_cnt); |
d17e1dd2 | 1158 | else |
1f75bb10 WD |
1159 | writefd_unbuffered(sock_f_out, iobuf_out, iobuf_out_cnt); |
1160 | iobuf_out_cnt = 0; | |
8d9dc9f9 AT |
1161 | } |
1162 | ||
0ba48136 | 1163 | |
9dd891bb | 1164 | static void writefd(int fd,char *buf,size_t len) |
d6dead6b | 1165 | { |
4033b80b WD |
1166 | if (fd == msg_fd_out) { |
1167 | rprintf(FERROR, "Internal error: wrong write used in receiver.\n"); | |
1168 | exit_cleanup(RERR_PROTOCOL); | |
1169 | } | |
90ba34e2 | 1170 | |
1f75bb10 WD |
1171 | if (fd == sock_f_out) |
1172 | stats.total_written += len; | |
1173 | ||
b9f592fb WD |
1174 | if (fd == write_batch_monitor_out) { |
1175 | if ((size_t)write(batch_fd, buf, len) != len) | |
1176 | exit_cleanup(RERR_FILEIO); | |
1177 | } | |
1178 | ||
1f75bb10 | 1179 | if (!iobuf_out || fd != sock_f_out) { |
4c36ddbe AT |
1180 | writefd_unbuffered(fd, buf, len); |
1181 | return; | |
1182 | } | |
d6dead6b AT |
1183 | |
1184 | while (len) { | |
1f75bb10 | 1185 | int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt); |
d6dead6b | 1186 | if (n > 0) { |
1f75bb10 | 1187 | memcpy(iobuf_out+iobuf_out_cnt, buf, n); |
d6dead6b AT |
1188 | buf += n; |
1189 | len -= n; | |
1f75bb10 | 1190 | iobuf_out_cnt += n; |
d6dead6b | 1191 | } |
3151cbae | 1192 | |
1f75bb10 | 1193 | if (iobuf_out_cnt == IO_BUFFER_SIZE) |
d17e1dd2 | 1194 | io_flush(NORMAL_FLUSH); |
d6dead6b | 1195 | } |
d6dead6b | 1196 | } |
720b47f2 AT |
1197 | |
1198 | ||
0d67e00a | 1199 | void write_shortint(int f, int x) |
9361f839 WD |
1200 | { |
1201 | uchar b[2]; | |
1202 | b[0] = x; | |
1203 | b[1] = x >> 8; | |
1204 | writefd(f, (char *)b, 2); | |
1205 | } | |
1206 | ||
1207 | ||
b7922338 | 1208 | void write_int(int f,int32 x) |
720b47f2 | 1209 | { |
8d9dc9f9 AT |
1210 | char b[4]; |
1211 | SIVAL(b,0,x); | |
4c36ddbe | 1212 | writefd(f,b,4); |
720b47f2 AT |
1213 | } |
1214 | ||
7a24c346 | 1215 | |
805edf9d MP |
1216 | void write_int_named(int f, int32 x, const char *phase) |
1217 | { | |
1218 | io_write_phase = phase; | |
1219 | write_int(f, x); | |
1220 | io_write_phase = phase_unknown; | |
1221 | } | |
1222 | ||
1223 | ||
7a24c346 MP |
1224 | /* |
1225 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any | |
1226 | * 64-bit types on this platform. | |
1227 | */ | |
71c46176 | 1228 | void write_longint(int f, int64 x) |
3a6a366f | 1229 | { |
3a6a366f | 1230 | char b[8]; |
3a6a366f | 1231 | |
91c4da3f | 1232 | if (x <= 0x7FFFFFFF) { |
3a6a366f AT |
1233 | write_int(f, (int)x); |
1234 | return; | |
1235 | } | |
1236 | ||
031fa9ad WD |
1237 | #if SIZEOF_INT64 < 8 |
1238 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1239 | exit_cleanup(RERR_UNSUPPORTED); | |
1240 | #else | |
8de330a3 | 1241 | write_int(f, (int32)0xFFFFFFFF); |
3a6a366f AT |
1242 | SIVAL(b,0,(x&0xFFFFFFFF)); |
1243 | SIVAL(b,4,((x>>32)&0xFFFFFFFF)); | |
1244 | ||
4c36ddbe | 1245 | writefd(f,b,8); |
031fa9ad | 1246 | #endif |
3a6a366f AT |
1247 | } |
1248 | ||
9dd891bb | 1249 | void write_buf(int f,char *buf,size_t len) |
720b47f2 | 1250 | { |
4c36ddbe | 1251 | writefd(f,buf,len); |
720b47f2 AT |
1252 | } |
1253 | ||
880da007 | 1254 | /** Write a string to the connection */ |
cf338ab1 | 1255 | void write_sbuf(int f, char *buf) |
f0fca04e | 1256 | { |
93095cbe | 1257 | writefd(f, buf, strlen(buf)); |
f0fca04e AT |
1258 | } |
1259 | ||
9361f839 | 1260 | void write_byte(int f, uchar c) |
182dca5c | 1261 | { |
93095cbe | 1262 | writefd(f, (char *)&c, 1); |
182dca5c AT |
1263 | } |
1264 | ||
46e99b09 WD |
1265 | void write_vstring(int f, char *str, int len) |
1266 | { | |
1267 | uchar lenbuf[3], *lb = lenbuf; | |
1268 | ||
1269 | if (len > 0x7F) { | |
1270 | if (len > 0x7FFF) { | |
1271 | rprintf(FERROR, | |
1272 | "attempting to send over-long vstring (%d > %d)\n", | |
1273 | len, 0x7FFF); | |
1274 | exit_cleanup(RERR_PROTOCOL); | |
1275 | } | |
1276 | *lb++ = len / 0x100 + 0x80; | |
1277 | } | |
1278 | *lb = len; | |
1279 | ||
1280 | writefd(f, (char*)lenbuf, lb - lenbuf + 1); | |
1281 | if (len) | |
1282 | writefd(f, str, len); | |
1283 | } | |
1284 | ||
7a55d06e | 1285 | |
914cc65c | 1286 | /** |
6ed6d7f5 WD |
1287 | * Read a line of up to @p maxlen characters into @p buf (not counting |
1288 | * the trailing null). Strips the (required) trailing newline and all | |
1289 | * carriage returns. | |
914cc65c | 1290 | * |
6ed6d7f5 | 1291 | * @return 1 for success; 0 for I/O error or truncation. |
914cc65c | 1292 | **/ |
9dd891bb | 1293 | int read_line(int f, char *buf, size_t maxlen) |
f0fca04e AT |
1294 | { |
1295 | while (maxlen) { | |
528bfcd7 | 1296 | buf[0] = 0; |
f0fca04e | 1297 | read_buf(f, buf, 1); |
914cc65c MP |
1298 | if (buf[0] == 0) |
1299 | return 0; | |
6ed6d7f5 | 1300 | if (buf[0] == '\n') |
f0fca04e | 1301 | break; |
f0fca04e AT |
1302 | if (buf[0] != '\r') { |
1303 | buf++; | |
1304 | maxlen--; | |
1305 | } | |
1306 | } | |
6ed6d7f5 WD |
1307 | *buf = '\0'; |
1308 | return maxlen > 0; | |
f0fca04e AT |
1309 | } |
1310 | ||
1311 | ||
1312 | void io_printf(int fd, const char *format, ...) | |
1313 | { | |
d62bcc17 | 1314 | va_list ap; |
33544bf4 | 1315 | char buf[BIGPATHBUFLEN]; |
f0fca04e | 1316 | int len; |
3151cbae | 1317 | |
f0fca04e | 1318 | va_start(ap, format); |
3151cbae | 1319 | len = vsnprintf(buf, sizeof buf, format, ap); |
f0fca04e AT |
1320 | va_end(ap); |
1321 | ||
f89b9368 WD |
1322 | if (len < 0) |
1323 | exit_cleanup(RERR_STREAMIO); | |
f0fca04e | 1324 | |
33544bf4 WD |
1325 | if (len > (int)sizeof buf) { |
1326 | rprintf(FERROR, "io_printf() was too long for the buffer.\n"); | |
1327 | exit_cleanup(RERR_STREAMIO); | |
1328 | } | |
1329 | ||
f0fca04e AT |
1330 | write_sbuf(fd, buf); |
1331 | } | |
8d9dc9f9 AT |
1332 | |
1333 | ||
d17e1dd2 | 1334 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1335 | void io_start_multiplex_out(void) |
8d9dc9f9 | 1336 | { |
d17e1dd2 | 1337 | io_flush(NORMAL_FLUSH); |
1f75bb10 | 1338 | io_start_buffering_out(); |
8d9dc9f9 AT |
1339 | io_multiplexing_out = 1; |
1340 | } | |
1341 | ||
d17e1dd2 | 1342 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1343 | void io_start_multiplex_in(void) |
8d9dc9f9 | 1344 | { |
d17e1dd2 | 1345 | io_flush(NORMAL_FLUSH); |
1f75bb10 | 1346 | io_start_buffering_in(); |
8d9dc9f9 AT |
1347 | io_multiplexing_in = 1; |
1348 | } | |
1349 | ||
d17e1dd2 WD |
1350 | /** Write an message to the multiplexed data stream. */ |
1351 | int io_multiplex_write(enum msgcode code, char *buf, size_t len) | |
8d9dc9f9 | 1352 | { |
f89b9368 WD |
1353 | if (!io_multiplexing_out) |
1354 | return 0; | |
8d9dc9f9 | 1355 | |
d17e1dd2 | 1356 | io_flush(NORMAL_FLUSH); |
1b7c47cb | 1357 | stats.total_written += (len+4); |
1f75bb10 | 1358 | mplex_write(code, buf, len); |
8d9dc9f9 AT |
1359 | return 1; |
1360 | } | |
1361 | ||
7f459268 WD |
1362 | void close_multiplexing_in(void) |
1363 | { | |
1364 | io_multiplexing_in = 0; | |
1365 | } | |
1366 | ||
d17e1dd2 | 1367 | /** Stop output multiplexing. */ |
7f459268 | 1368 | void close_multiplexing_out(void) |
554e0a8d AT |
1369 | { |
1370 | io_multiplexing_out = 0; | |
1371 | } | |
1372 | ||
b9f592fb WD |
1373 | void start_write_batch(int fd) |
1374 | { | |
741d6544 WD |
1375 | write_stream_flags(batch_fd); |
1376 | ||
b9f592fb WD |
1377 | /* Some communication has already taken place, but we don't |
1378 | * enable batch writing until here so that we can write a | |
1379 | * canonical record of the communication even though the | |
1380 | * actual communication so far depends on whether a daemon | |
1381 | * is involved. */ | |
1382 | write_int(batch_fd, protocol_version); | |
1383 | write_int(batch_fd, checksum_seed); | |
b9f592fb WD |
1384 | |
1385 | if (am_sender) | |
1386 | write_batch_monitor_out = fd; | |
1387 | else | |
1388 | write_batch_monitor_in = fd; | |
1389 | } | |
1390 | ||
1391 | void stop_write_batch(void) | |
1392 | { | |
1393 | write_batch_monitor_out = -1; | |
1394 | write_batch_monitor_in = -1; | |
1395 | } |