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; |
188fed95 | 52 | extern int csum_length; |
b9f592fb WD |
53 | extern int checksum_seed; |
54 | extern int protocol_version; | |
cdf236aa WD |
55 | extern int remove_sent_files; |
56 | extern int preserve_hard_links; | |
d19320fd | 57 | extern char *filesfrom_host; |
a800434a | 58 | extern struct stats stats; |
cdf236aa | 59 | extern struct file_list *the_file_list; |
720b47f2 | 60 | |
a86179f4 | 61 | const char phase_unknown[] = "unknown"; |
e626b29e | 62 | int select_timeout = SELECT_TIMEOUT; |
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; | |
1f75bb10 WD |
93 | static time_t last_io; |
94 | static int no_flush; | |
95 | ||
b9f592fb WD |
96 | static int write_batch_monitor_in = -1; |
97 | static int write_batch_monitor_out = -1; | |
98 | ||
56014c8c WD |
99 | static int io_filesfrom_f_in = -1; |
100 | static int io_filesfrom_f_out = -1; | |
101 | static char io_filesfrom_buf[2048]; | |
102 | static char *io_filesfrom_bp; | |
103 | static char io_filesfrom_lastchar; | |
104 | static int io_filesfrom_buflen; | |
af436313 | 105 | static size_t contiguous_write_len = 0; |
720b47f2 | 106 | |
9dd891bb | 107 | static void read_loop(int fd, char *buf, size_t len); |
ff41a59f | 108 | |
c6816b94 WD |
109 | struct flist_ndx_item { |
110 | struct flist_ndx_item *next; | |
111 | int ndx; | |
d17e1dd2 WD |
112 | }; |
113 | ||
c6816b94 WD |
114 | struct flist_ndx_list { |
115 | struct flist_ndx_item *head, *tail; | |
116 | }; | |
117 | ||
cdf236aa | 118 | static struct flist_ndx_list redo_list, hlink_list; |
d17e1dd2 WD |
119 | |
120 | struct msg_list { | |
121 | struct msg_list *next; | |
122 | char *buf; | |
123 | int len; | |
124 | }; | |
125 | ||
126 | static struct msg_list *msg_list_head; | |
127 | static struct msg_list *msg_list_tail; | |
128 | ||
c6816b94 | 129 | static void flist_ndx_push(struct flist_ndx_list *lp, int ndx) |
d17e1dd2 | 130 | { |
c6816b94 WD |
131 | struct flist_ndx_item *item; |
132 | ||
133 | if (!(item = new(struct flist_ndx_item))) | |
134 | out_of_memory("flist_ndx_push"); | |
135 | item->next = NULL; | |
136 | item->ndx = ndx; | |
137 | if (lp->tail) | |
138 | lp->tail->next = item; | |
d17e1dd2 | 139 | else |
c6816b94 WD |
140 | lp->head = item; |
141 | lp->tail = item; | |
142 | } | |
143 | ||
144 | static int flist_ndx_pop(struct flist_ndx_list *lp) | |
145 | { | |
146 | struct flist_ndx_item *next; | |
147 | int ndx; | |
148 | ||
149 | if (!lp->head) | |
150 | return -1; | |
151 | ||
152 | ndx = lp->head->ndx; | |
153 | next = lp->head->next; | |
154 | free(lp->head); | |
155 | lp->head = next; | |
156 | if (!next) | |
157 | lp->tail = NULL; | |
158 | ||
159 | return ndx; | |
d17e1dd2 WD |
160 | } |
161 | ||
8d9dc9f9 AT |
162 | static void check_timeout(void) |
163 | { | |
164 | time_t t; | |
90ba34e2 | 165 | |
9e2409ab | 166 | if (!io_timeout || ignore_timeout) |
d17e1dd2 | 167 | return; |
8d9dc9f9 AT |
168 | |
169 | if (!last_io) { | |
170 | last_io = time(NULL); | |
171 | return; | |
172 | } | |
173 | ||
174 | t = time(NULL); | |
175 | ||
1f75bb10 | 176 | if (t - last_io >= io_timeout) { |
0adb99b9 | 177 | if (!am_server && !am_daemon) { |
4ccfd96c | 178 | rprintf(FERROR, "io timeout after %d seconds -- exiting\n", |
0adb99b9 AT |
179 | (int)(t-last_io)); |
180 | } | |
65417579 | 181 | exit_cleanup(RERR_TIMEOUT); |
8d9dc9f9 AT |
182 | } |
183 | } | |
184 | ||
1f75bb10 WD |
185 | /* Note the fds used for the main socket (which might really be a pipe |
186 | * for a local transfer, but we can ignore that). */ | |
187 | void io_set_sock_fds(int f_in, int f_out) | |
188 | { | |
189 | sock_f_in = f_in; | |
190 | sock_f_out = f_out; | |
191 | } | |
192 | ||
98f8c9a5 WD |
193 | /* Setup the fd used to receive MSG_* messages. Only needed during the |
194 | * early stages of being a local sender (up through the sending of the | |
195 | * file list) or when we're the generator (to fetch the messages from | |
196 | * the receiver). */ | |
d17e1dd2 WD |
197 | void set_msg_fd_in(int fd) |
198 | { | |
199 | msg_fd_in = fd; | |
200 | } | |
201 | ||
98f8c9a5 WD |
202 | /* Setup the fd used to send our MSG_* messages. Only needed when |
203 | * we're the receiver (to send our messages to the generator). */ | |
d17e1dd2 WD |
204 | void set_msg_fd_out(int fd) |
205 | { | |
206 | msg_fd_out = fd; | |
207 | set_nonblocking(msg_fd_out); | |
208 | } | |
209 | ||
210 | /* Add a message to the pending MSG_* list. */ | |
211 | static void msg_list_add(int code, char *buf, int len) | |
554e0a8d | 212 | { |
d17e1dd2 WD |
213 | struct msg_list *ml; |
214 | ||
215 | if (!(ml = new(struct msg_list))) | |
c6816b94 | 216 | out_of_memory("msg_list_add"); |
d17e1dd2 WD |
217 | ml->next = NULL; |
218 | if (!(ml->buf = new_array(char, len+4))) | |
c6816b94 | 219 | out_of_memory("msg_list_add"); |
d17e1dd2 WD |
220 | SIVAL(ml->buf, 0, ((code+MPLEX_BASE)<<24) | len); |
221 | memcpy(ml->buf+4, buf, len); | |
222 | ml->len = len+4; | |
223 | if (msg_list_tail) | |
224 | msg_list_tail->next = ml; | |
225 | else | |
226 | msg_list_head = ml; | |
227 | msg_list_tail = ml; | |
554e0a8d AT |
228 | } |
229 | ||
d17e1dd2 WD |
230 | void send_msg(enum msgcode code, char *buf, int len) |
231 | { | |
0d67e00a WD |
232 | if (msg_fd_out < 0) { |
233 | io_multiplex_write(code, buf, len); | |
234 | return; | |
235 | } | |
d17e1dd2 WD |
236 | msg_list_add(code, buf, len); |
237 | msg_list_push(NORMAL_FLUSH); | |
238 | } | |
239 | ||
98f8c9a5 WD |
240 | /* Read a message from the MSG_* fd and handle it. This is called either |
241 | * during the early stages of being a local sender (up through the sending | |
242 | * of the file list) or when we're the generator (to fetch the messages | |
243 | * from the receiver). */ | |
d17e1dd2 | 244 | static void read_msg_fd(void) |
554e0a8d | 245 | { |
f9c6b3e7 | 246 | char buf[2048]; |
06ce139f | 247 | size_t n; |
d17e1dd2 | 248 | int fd = msg_fd_in; |
ff41a59f AT |
249 | int tag, len; |
250 | ||
00bdf899 | 251 | /* Temporarily disable msg_fd_in. This is needed to avoid looping back |
af436313 | 252 | * to this routine from writefd_unbuffered(). */ |
d17e1dd2 | 253 | msg_fd_in = -1; |
554e0a8d | 254 | |
ff41a59f AT |
255 | read_loop(fd, buf, 4); |
256 | tag = IVAL(buf, 0); | |
257 | ||
258 | len = tag & 0xFFFFFF; | |
d17e1dd2 | 259 | tag = (tag >> 24) - MPLEX_BASE; |
ff41a59f | 260 | |
d17e1dd2 WD |
261 | switch (tag) { |
262 | case MSG_DONE: | |
98f8c9a5 | 263 | if (len != 0 || !am_generator) { |
13c7bcbb | 264 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
d17e1dd2 | 265 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 266 | } |
c6816b94 | 267 | flist_ndx_push(&redo_list, -1); |
d17e1dd2 WD |
268 | break; |
269 | case MSG_REDO: | |
98f8c9a5 | 270 | if (len != 4 || !am_generator) { |
13c7bcbb | 271 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
d17e1dd2 | 272 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 273 | } |
d17e1dd2 | 274 | read_loop(fd, buf, 4); |
c6816b94 | 275 | flist_ndx_push(&redo_list, IVAL(buf,0)); |
d17e1dd2 | 276 | break; |
0d67e00a WD |
277 | case MSG_DELETED: |
278 | if (len >= (int)sizeof buf || !am_generator) { | |
279 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); | |
280 | exit_cleanup(RERR_STREAMIO); | |
281 | } | |
282 | read_loop(fd, buf, len); | |
283 | io_multiplex_write(MSG_DELETED, buf, len); | |
284 | break; | |
9981c27e WD |
285 | case MSG_SUCCESS: |
286 | if (len != 4 || !am_generator) { | |
287 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); | |
288 | exit_cleanup(RERR_STREAMIO); | |
289 | } | |
290 | read_loop(fd, buf, len); | |
cdf236aa WD |
291 | if (remove_sent_files) |
292 | io_multiplex_write(MSG_SUCCESS, buf, len); | |
293 | if (preserve_hard_links) | |
294 | flist_ndx_push(&hlink_list, IVAL(buf,0)); | |
9981c27e | 295 | break; |
d17e1dd2 WD |
296 | case MSG_INFO: |
297 | case MSG_ERROR: | |
298 | case MSG_LOG: | |
299 | while (len) { | |
300 | n = len; | |
301 | if (n >= sizeof buf) | |
302 | n = sizeof buf - 1; | |
303 | read_loop(fd, buf, n); | |
304 | rwrite((enum logcode)tag, buf, n); | |
305 | len -= n; | |
306 | } | |
307 | break; | |
308 | default: | |
13c7bcbb | 309 | rprintf(FERROR, "unknown message %d:%d\n", tag, len); |
d17e1dd2 WD |
310 | exit_cleanup(RERR_STREAMIO); |
311 | } | |
312 | ||
313 | msg_fd_in = fd; | |
314 | } | |
315 | ||
316 | /* Try to push messages off the list onto the wire. If we leave with more | |
317 | * to do, return 0. On error, return -1. If everything flushed, return 1. | |
f9c6b3e7 | 318 | * This is only active in the receiver. */ |
d17e1dd2 WD |
319 | int msg_list_push(int flush_it_all) |
320 | { | |
321 | static int written = 0; | |
322 | struct timeval tv; | |
323 | fd_set fds; | |
324 | ||
325 | if (msg_fd_out < 0) | |
326 | return -1; | |
327 | ||
328 | while (msg_list_head) { | |
329 | struct msg_list *ml = msg_list_head; | |
330 | int n = write(msg_fd_out, ml->buf + written, ml->len - written); | |
331 | if (n < 0) { | |
332 | if (errno == EINTR) | |
333 | continue; | |
334 | if (errno != EWOULDBLOCK && errno != EAGAIN) | |
335 | return -1; | |
336 | if (!flush_it_all) | |
337 | return 0; | |
338 | FD_ZERO(&fds); | |
339 | FD_SET(msg_fd_out, &fds); | |
e626b29e | 340 | tv.tv_sec = select_timeout; |
d17e1dd2 WD |
341 | tv.tv_usec = 0; |
342 | if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv)) | |
343 | check_timeout(); | |
344 | } else if ((written += n) == ml->len) { | |
345 | free(ml->buf); | |
346 | msg_list_head = ml->next; | |
347 | if (!msg_list_head) | |
348 | msg_list_tail = NULL; | |
349 | free(ml); | |
350 | written = 0; | |
351 | } | |
554e0a8d | 352 | } |
d17e1dd2 WD |
353 | return 1; |
354 | } | |
355 | ||
cdf236aa | 356 | int get_redo_num(int itemizing, enum logcode code) |
d17e1dd2 | 357 | { |
cdf236aa WD |
358 | while (1) { |
359 | if (hlink_list.head) | |
360 | check_for_finished_hlinks(itemizing, code); | |
361 | if (redo_list.head) | |
362 | break; | |
d17e1dd2 | 363 | read_msg_fd(); |
c6816b94 | 364 | } |
554e0a8d | 365 | |
c6816b94 | 366 | return flist_ndx_pop(&redo_list); |
554e0a8d AT |
367 | } |
368 | ||
cdf236aa WD |
369 | int get_hlink_num(void) |
370 | { | |
371 | return flist_ndx_pop(&hlink_list); | |
372 | } | |
373 | ||
56014c8c WD |
374 | /** |
375 | * When we're the receiver and we have a local --files-from list of names | |
376 | * that needs to be sent over the socket to the sender, we have to do two | |
377 | * things at the same time: send the sender a list of what files we're | |
378 | * processing and read the incoming file+info list from the sender. We do | |
379 | * this by augmenting the read_timeout() function to copy this data. It | |
380 | * uses the io_filesfrom_buf to read a block of data from f_in (when it is | |
381 | * ready, since it might be a pipe) and then blast it out f_out (when it | |
382 | * is ready to receive more data). | |
383 | */ | |
384 | void io_set_filesfrom_fds(int f_in, int f_out) | |
385 | { | |
386 | io_filesfrom_f_in = f_in; | |
387 | io_filesfrom_f_out = f_out; | |
388 | io_filesfrom_bp = io_filesfrom_buf; | |
389 | io_filesfrom_lastchar = '\0'; | |
390 | io_filesfrom_buflen = 0; | |
391 | } | |
720b47f2 | 392 | |
cb2e1f18 WD |
393 | /* It's almost always an error to get an EOF when we're trying to read from the |
394 | * network, because the protocol is (for the most part) self-terminating. | |
880da007 | 395 | * |
cb2e1f18 WD |
396 | * There is one case for the receiver when it is at the end of the transfer |
397 | * (hanging around reading any keep-alive packets that might come its way): if | |
398 | * the sender dies before the generator's kill-signal comes through, we can end | |
399 | * up here needing to loop until the kill-signal arrives. In this situation, | |
400 | * kluge_around_eof will be < 0. | |
401 | * | |
402 | * There is another case for older protocol versions (< 24) where the module | |
403 | * listing was not terminated, so we must ignore an EOF error in that case and | |
404 | * exit. In this situation, kluge_around_eof will be > 0. */ | |
1f75bb10 | 405 | static void whine_about_eof(int fd) |
7a55d06e | 406 | { |
574c2500 | 407 | if (kluge_around_eof && fd == sock_f_in) { |
55bb7fff | 408 | int i; |
574c2500 WD |
409 | if (kluge_around_eof > 0) |
410 | exit_cleanup(0); | |
55bb7fff WD |
411 | /* If we're still here after 10 seconds, exit with an error. */ |
412 | for (i = 10*1000/20; i--; ) | |
574c2500 WD |
413 | msleep(20); |
414 | } | |
3151cbae | 415 | |
00bdf899 | 416 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
dca68b0a WD |
417 | "(%.0f bytes received so far) [%s]\n", |
418 | (double)stats.total_read, who_am_i()); | |
00bdf899 WD |
419 | |
420 | exit_cleanup(RERR_STREAMIO); | |
7a55d06e | 421 | } |
720b47f2 | 422 | |
7a55d06e | 423 | |
880da007 | 424 | /** |
6ed6d7f5 | 425 | * Read from a socket with I/O timeout. return the number of bytes |
c3563c46 MP |
426 | * read. If no bytes can be read then exit, never return a number <= 0. |
427 | * | |
8886f8d0 MP |
428 | * TODO: If the remote shell connection fails, then current versions |
429 | * actually report an "unexpected EOF" error here. Since it's a | |
430 | * fairly common mistake to try to use rsh when ssh is required, we | |
431 | * should trap that: if we fail to read any data at all, we should | |
432 | * give a better explanation. We can tell whether the connection has | |
433 | * started by looking e.g. at whether the remote version is known yet. | |
c3563c46 | 434 | */ |
3151cbae | 435 | static int read_timeout(int fd, char *buf, size_t len) |
8d9dc9f9 | 436 | { |
d62bcc17 | 437 | int n, ret = 0; |
4c36ddbe | 438 | |
d17e1dd2 | 439 | io_flush(NORMAL_FLUSH); |
ea2111d1 | 440 | |
4c36ddbe | 441 | while (ret == 0) { |
7a55d06e | 442 | /* until we manage to read *something* */ |
56014c8c | 443 | fd_set r_fds, w_fds; |
4c36ddbe | 444 | struct timeval tv; |
1ea087a7 | 445 | int maxfd = fd; |
a57873b7 | 446 | int count; |
4c36ddbe | 447 | |
56014c8c | 448 | FD_ZERO(&r_fds); |
a7026ba9 | 449 | FD_ZERO(&w_fds); |
56014c8c | 450 | FD_SET(fd, &r_fds); |
af436313 | 451 | if (msg_list_head) { |
4033b80b | 452 | FD_SET(msg_fd_out, &w_fds); |
1ea087a7 WD |
453 | if (msg_fd_out > maxfd) |
454 | maxfd = msg_fd_out; | |
56014c8c | 455 | } |
3309507d | 456 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
457 | int new_fd; |
458 | if (io_filesfrom_buflen == 0) { | |
3309507d | 459 | if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
460 | FD_SET(io_filesfrom_f_in, &r_fds); |
461 | new_fd = io_filesfrom_f_in; | |
462 | } else { | |
463 | io_filesfrom_f_out = -1; | |
464 | new_fd = -1; | |
465 | } | |
466 | } else { | |
56014c8c WD |
467 | FD_SET(io_filesfrom_f_out, &w_fds); |
468 | new_fd = io_filesfrom_f_out; | |
469 | } | |
1ea087a7 WD |
470 | if (new_fd > maxfd) |
471 | maxfd = new_fd; | |
554e0a8d AT |
472 | } |
473 | ||
e626b29e | 474 | tv.tv_sec = select_timeout; |
4c36ddbe AT |
475 | tv.tv_usec = 0; |
476 | ||
554e0a8d AT |
477 | errno = 0; |
478 | ||
a7026ba9 | 479 | count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); |
a57873b7 | 480 | |
a57873b7 | 481 | if (count <= 0) { |
f89b9368 | 482 | if (errno == EBADF) |
554e0a8d | 483 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 484 | check_timeout(); |
4c36ddbe AT |
485 | continue; |
486 | } | |
487 | ||
af436313 | 488 | if (msg_list_head && FD_ISSET(msg_fd_out, &w_fds)) |
4033b80b | 489 | msg_list_push(NORMAL_FLUSH); |
554e0a8d | 490 | |
3309507d | 491 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
492 | if (io_filesfrom_buflen) { |
493 | if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { | |
494 | int l = write(io_filesfrom_f_out, | |
495 | io_filesfrom_bp, | |
496 | io_filesfrom_buflen); | |
497 | if (l > 0) { | |
498 | if (!(io_filesfrom_buflen -= l)) | |
499 | io_filesfrom_bp = io_filesfrom_buf; | |
500 | else | |
501 | io_filesfrom_bp += l; | |
502 | } else { | |
503 | /* XXX should we complain? */ | |
504 | io_filesfrom_f_out = -1; | |
505 | } | |
506 | } | |
3309507d | 507 | } else if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
508 | if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { |
509 | int l = read(io_filesfrom_f_in, | |
510 | io_filesfrom_buf, | |
511 | sizeof io_filesfrom_buf); | |
512 | if (l <= 0) { | |
513 | /* Send end-of-file marker */ | |
514 | io_filesfrom_buf[0] = '\0'; | |
515 | io_filesfrom_buf[1] = '\0'; | |
516 | io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1; | |
517 | io_filesfrom_f_in = -1; | |
518 | } else { | |
56014c8c WD |
519 | if (!eol_nulls) { |
520 | char *s = io_filesfrom_buf + l; | |
521 | /* Transform CR and/or LF into '\0' */ | |
522 | while (s-- > io_filesfrom_buf) { | |
523 | if (*s == '\n' || *s == '\r') | |
524 | *s = '\0'; | |
525 | } | |
526 | } | |
527 | if (!io_filesfrom_lastchar) { | |
528 | /* Last buf ended with a '\0', so don't | |
529 | * let this buf start with one. */ | |
530 | while (l && !*io_filesfrom_bp) | |
531 | io_filesfrom_bp++, l--; | |
532 | } | |
533 | if (!l) | |
534 | io_filesfrom_bp = io_filesfrom_buf; | |
535 | else { | |
536 | char *f = io_filesfrom_bp; | |
537 | char *t = f; | |
538 | char *eob = f + l; | |
539 | /* Eliminate any multi-'\0' runs. */ | |
540 | while (f != eob) { | |
541 | if (!(*t++ = *f++)) { | |
542 | while (f != eob && !*f) | |
543 | f++, l--; | |
544 | } | |
545 | } | |
546 | io_filesfrom_lastchar = f[-1]; | |
547 | } | |
548 | io_filesfrom_buflen = l; | |
549 | } | |
550 | } | |
551 | } | |
552 | } | |
553 | ||
f89b9368 WD |
554 | if (!FD_ISSET(fd, &r_fds)) |
555 | continue; | |
554e0a8d | 556 | |
4c36ddbe AT |
557 | n = read(fd, buf, len); |
558 | ||
1ea087a7 WD |
559 | if (n <= 0) { |
560 | if (n == 0) | |
1f75bb10 | 561 | whine_about_eof(fd); /* Doesn't return. */ |
d62bcc17 WD |
562 | if (errno == EINTR || errno == EWOULDBLOCK |
563 | || errno == EAGAIN) | |
7a55d06e | 564 | continue; |
1f75bb10 WD |
565 | |
566 | /* Don't write errors on a dead socket. */ | |
567 | if (fd == sock_f_in) | |
7f459268 | 568 | close_multiplexing_out(); |
1f75bb10 WD |
569 | rsyserr(FERROR, errno, "read error"); |
570 | exit_cleanup(RERR_STREAMIO); | |
8d9dc9f9 | 571 | } |
00bdf899 WD |
572 | |
573 | buf += n; | |
574 | len -= n; | |
575 | ret += n; | |
1f75bb10 WD |
576 | |
577 | if (io_timeout && fd == sock_f_in) | |
00bdf899 | 578 | last_io = time(NULL); |
4c36ddbe | 579 | } |
8d9dc9f9 | 580 | |
4c36ddbe AT |
581 | return ret; |
582 | } | |
8d9dc9f9 | 583 | |
56014c8c WD |
584 | /** |
585 | * Read a line into the "fname" buffer (which must be at least MAXPATHLEN | |
586 | * characters long). | |
587 | */ | |
588 | int read_filesfrom_line(int fd, char *fname) | |
589 | { | |
590 | char ch, *s, *eob = fname + MAXPATHLEN - 1; | |
591 | int cnt; | |
d19320fd | 592 | int reading_remotely = filesfrom_host != NULL; |
56014c8c WD |
593 | int nulls = eol_nulls || reading_remotely; |
594 | ||
595 | start: | |
596 | s = fname; | |
597 | while (1) { | |
598 | cnt = read(fd, &ch, 1); | |
599 | if (cnt < 0 && (errno == EWOULDBLOCK | |
600 | || errno == EINTR || errno == EAGAIN)) { | |
601 | struct timeval tv; | |
602 | fd_set fds; | |
603 | FD_ZERO(&fds); | |
604 | FD_SET(fd, &fds); | |
e626b29e | 605 | tv.tv_sec = select_timeout; |
56014c8c WD |
606 | tv.tv_usec = 0; |
607 | if (!select(fd+1, &fds, NULL, NULL, &tv)) | |
608 | check_timeout(); | |
609 | continue; | |
610 | } | |
611 | if (cnt != 1) | |
612 | break; | |
613 | if (nulls? !ch : (ch == '\r' || ch == '\n')) { | |
614 | /* Skip empty lines if reading locally. */ | |
615 | if (!reading_remotely && s == fname) | |
616 | continue; | |
617 | break; | |
618 | } | |
619 | if (s < eob) | |
620 | *s++ = ch; | |
621 | } | |
622 | *s = '\0'; | |
7a55d06e | 623 | |
6b45fcf1 WD |
624 | /* Dump comments. */ |
625 | if (*fname == '#' || *fname == ';') | |
56014c8c WD |
626 | goto start; |
627 | ||
628 | return s - fname; | |
629 | } | |
7a55d06e MP |
630 | |
631 | ||
1f75bb10 WD |
632 | static char *iobuf_out; |
633 | static int iobuf_out_cnt; | |
634 | ||
635 | void io_start_buffering_out(void) | |
636 | { | |
637 | if (iobuf_out) | |
638 | return; | |
639 | if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) | |
640 | out_of_memory("io_start_buffering_out"); | |
641 | iobuf_out_cnt = 0; | |
642 | } | |
643 | ||
644 | ||
645 | static char *iobuf_in; | |
646 | static size_t iobuf_in_siz; | |
647 | ||
648 | void io_start_buffering_in(void) | |
649 | { | |
650 | if (iobuf_in) | |
651 | return; | |
652 | iobuf_in_siz = 2 * IO_BUFFER_SIZE; | |
653 | if (!(iobuf_in = new_array(char, iobuf_in_siz))) | |
654 | out_of_memory("io_start_buffering_in"); | |
655 | } | |
656 | ||
657 | ||
658 | void io_end_buffering(void) | |
659 | { | |
660 | io_flush(NORMAL_FLUSH); | |
661 | if (!io_multiplexing_out) { | |
662 | free(iobuf_out); | |
663 | iobuf_out = NULL; | |
664 | } | |
665 | } | |
666 | ||
667 | ||
cdf236aa | 668 | void maybe_send_keepalive(void) |
9e2409ab WD |
669 | { |
670 | if (time(NULL) - last_io >= allowed_lull) { | |
671 | if (!iobuf_out || !iobuf_out_cnt) { | |
3221f451 WD |
672 | if (protocol_version < 29) |
673 | return; /* there's nothing we can do */ | |
cdf236aa | 674 | write_int(sock_f_out, the_file_list->count); |
9e2409ab WD |
675 | write_shortint(sock_f_out, ITEM_IS_NEW); |
676 | } | |
677 | if (iobuf_out) | |
678 | io_flush(NORMAL_FLUSH); | |
679 | } | |
680 | } | |
681 | ||
682 | ||
880da007 MP |
683 | /** |
684 | * Continue trying to read len bytes - don't return until len has been | |
685 | * read. | |
686 | **/ | |
3151cbae | 687 | static void read_loop(int fd, char *buf, size_t len) |
4c36ddbe AT |
688 | { |
689 | while (len) { | |
690 | int n = read_timeout(fd, buf, len); | |
691 | ||
692 | buf += n; | |
693 | len -= n; | |
8d9dc9f9 AT |
694 | } |
695 | } | |
696 | ||
7a55d06e MP |
697 | |
698 | /** | |
699 | * Read from the file descriptor handling multiplexing - return number | |
700 | * of bytes read. | |
d62bcc17 WD |
701 | * |
702 | * Never returns <= 0. | |
7a55d06e | 703 | */ |
c399d22a | 704 | static int readfd_unbuffered(int fd, char *buf, size_t len) |
8d9dc9f9 | 705 | { |
6fe25398 | 706 | static size_t remaining; |
1f75bb10 | 707 | static size_t iobuf_in_ndx; |
909ce14f | 708 | int tag, ret = 0; |
0d67e00a | 709 | char line[MAXPATHLEN+1]; |
8d9dc9f9 | 710 | |
1f75bb10 | 711 | if (!iobuf_in || fd != sock_f_in) |
4c36ddbe | 712 | return read_timeout(fd, buf, len); |
8d9dc9f9 | 713 | |
76c21947 | 714 | if (!io_multiplexing_in && remaining == 0) { |
1f75bb10 WD |
715 | remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); |
716 | iobuf_in_ndx = 0; | |
76c21947 WD |
717 | } |
718 | ||
8d9dc9f9 AT |
719 | while (ret == 0) { |
720 | if (remaining) { | |
721 | len = MIN(len, remaining); | |
1f75bb10 WD |
722 | memcpy(buf, iobuf_in + iobuf_in_ndx, len); |
723 | iobuf_in_ndx += len; | |
8d9dc9f9 AT |
724 | remaining -= len; |
725 | ret = len; | |
76c21947 | 726 | break; |
8d9dc9f9 AT |
727 | } |
728 | ||
909ce14f | 729 | read_loop(fd, line, 4); |
ff41a59f | 730 | tag = IVAL(line, 0); |
679e7657 | 731 | |
8d9dc9f9 | 732 | remaining = tag & 0xFFFFFF; |
d17e1dd2 | 733 | tag = (tag >> 24) - MPLEX_BASE; |
8d9dc9f9 | 734 | |
d17e1dd2 WD |
735 | switch (tag) { |
736 | case MSG_DATA: | |
1f75bb10 WD |
737 | if (remaining > iobuf_in_siz) { |
738 | if (!(iobuf_in = realloc_array(iobuf_in, char, | |
739 | remaining))) | |
c399d22a | 740 | out_of_memory("readfd_unbuffered"); |
1f75bb10 | 741 | iobuf_in_siz = remaining; |
76c21947 | 742 | } |
1f75bb10 WD |
743 | read_loop(fd, iobuf_in, remaining); |
744 | iobuf_in_ndx = 0; | |
d17e1dd2 | 745 | break; |
0d67e00a WD |
746 | case MSG_DELETED: |
747 | if (remaining >= sizeof line) { | |
748 | rprintf(FERROR, "invalid multi-message %d:%ld\n", | |
749 | tag, (long)remaining); | |
750 | exit_cleanup(RERR_STREAMIO); | |
751 | } | |
752 | read_loop(fd, line, remaining); | |
753 | line[remaining] = '\0'; | |
754 | /* A directory name was sent with the trailing null */ | |
755 | if (remaining > 0 && !line[remaining-1]) | |
756 | log_delete(line, S_IFDIR); | |
757 | else | |
758 | log_delete(line, S_IFREG); | |
759 | remaining = 0; | |
760 | break; | |
9981c27e WD |
761 | case MSG_SUCCESS: |
762 | if (remaining != 4) { | |
cdf236aa WD |
763 | rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n", |
764 | tag, (long)remaining, who_am_i()); | |
9981c27e WD |
765 | exit_cleanup(RERR_STREAMIO); |
766 | } | |
767 | read_loop(fd, line, remaining); | |
768 | successful_send(IVAL(line, 0)); | |
769 | remaining = 0; | |
770 | break; | |
d17e1dd2 WD |
771 | case MSG_INFO: |
772 | case MSG_ERROR: | |
773 | if (remaining >= sizeof line) { | |
bd9fca47 | 774 | rprintf(FERROR, |
cdf236aa WD |
775 | "multiplexing overflow %d:%ld [%s]\n", |
776 | tag, (long)remaining, who_am_i()); | |
d17e1dd2 WD |
777 | exit_cleanup(RERR_STREAMIO); |
778 | } | |
779 | read_loop(fd, line, remaining); | |
780 | rwrite((enum logcode)tag, line, remaining); | |
781 | remaining = 0; | |
782 | break; | |
783 | default: | |
cdf236aa WD |
784 | rprintf(FERROR, "unexpected tag %d [%s]\n", |
785 | tag, who_am_i()); | |
65417579 | 786 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 787 | } |
8d9dc9f9 AT |
788 | } |
789 | ||
76c21947 | 790 | if (remaining == 0) |
d17e1dd2 | 791 | io_flush(NORMAL_FLUSH); |
76c21947 | 792 | |
8d9dc9f9 AT |
793 | return ret; |
794 | } | |
795 | ||
796 | ||
909ce14f | 797 | |
880da007 MP |
798 | /** |
799 | * Do a buffered read from @p fd. Don't return until all @p n bytes | |
800 | * have been read. If all @p n can't be read then exit with an | |
801 | * error. | |
802 | **/ | |
3151cbae | 803 | static void readfd(int fd, char *buffer, size_t N) |
720b47f2 | 804 | { |
6ba9279f | 805 | int ret; |
d62bcc17 | 806 | size_t total = 0; |
3151cbae | 807 | |
6ba9279f | 808 | while (total < N) { |
c399d22a | 809 | ret = readfd_unbuffered(fd, buffer + total, N-total); |
6ba9279f | 810 | total += ret; |
7f28dbee | 811 | } |
1b7c47cb | 812 | |
b9f592fb WD |
813 | if (fd == write_batch_monitor_in) { |
814 | if ((size_t)write(batch_fd, buffer, total) != total) | |
815 | exit_cleanup(RERR_FILEIO); | |
816 | } | |
1f75bb10 WD |
817 | |
818 | if (fd == sock_f_in) | |
819 | stats.total_read += total; | |
720b47f2 AT |
820 | } |
821 | ||
822 | ||
0d67e00a | 823 | int read_shortint(int f) |
9361f839 WD |
824 | { |
825 | uchar b[2]; | |
826 | readfd(f, (char *)b, 2); | |
827 | return (b[1] << 8) + b[0]; | |
828 | } | |
829 | ||
830 | ||
b7922338 | 831 | int32 read_int(int f) |
720b47f2 | 832 | { |
4c36ddbe | 833 | char b[4]; |
d730b113 AT |
834 | int32 ret; |
835 | ||
4c36ddbe | 836 | readfd(f,b,4); |
d730b113 | 837 | ret = IVAL(b,0); |
f89b9368 WD |
838 | if (ret == (int32)0xffffffff) |
839 | return -1; | |
d730b113 | 840 | return ret; |
720b47f2 AT |
841 | } |
842 | ||
71c46176 | 843 | int64 read_longint(int f) |
3a6a366f | 844 | { |
71c46176 | 845 | int64 ret; |
3a6a366f AT |
846 | char b[8]; |
847 | ret = read_int(f); | |
71c46176 | 848 | |
f89b9368 | 849 | if ((int32)ret != (int32)0xffffffff) |
8de330a3 | 850 | return ret; |
71c46176 | 851 | |
031fa9ad WD |
852 | #if SIZEOF_INT64 < 8 |
853 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
854 | exit_cleanup(RERR_UNSUPPORTED); | |
855 | #else | |
91c4da3f S |
856 | readfd(f,b,8); |
857 | ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); | |
031fa9ad | 858 | #endif |
71c46176 | 859 | |
3a6a366f AT |
860 | return ret; |
861 | } | |
862 | ||
9dd891bb | 863 | void read_buf(int f,char *buf,size_t len) |
720b47f2 | 864 | { |
4c36ddbe | 865 | readfd(f,buf,len); |
720b47f2 AT |
866 | } |
867 | ||
9dd891bb | 868 | void read_sbuf(int f,char *buf,size_t len) |
575f2fca | 869 | { |
93095cbe | 870 | readfd(f, buf, len); |
af436313 | 871 | buf[len] = '\0'; |
575f2fca AT |
872 | } |
873 | ||
9361f839 | 874 | uchar read_byte(int f) |
182dca5c | 875 | { |
9361f839 | 876 | uchar c; |
93095cbe | 877 | readfd(f, (char *)&c, 1); |
4c36ddbe | 878 | return c; |
182dca5c | 879 | } |
720b47f2 | 880 | |
46e99b09 WD |
881 | int read_vstring(int f, char *buf, int bufsize) |
882 | { | |
883 | int len = read_byte(f); | |
884 | ||
885 | if (len & 0x80) | |
886 | len = (len & ~0x80) * 0x100 + read_byte(f); | |
887 | ||
888 | if (len >= bufsize) { | |
889 | rprintf(FERROR, "over-long vstring received (%d > %d)\n", | |
890 | len, bufsize - 1); | |
9a6ed83f | 891 | return -1; |
46e99b09 WD |
892 | } |
893 | ||
894 | if (len) | |
895 | readfd(f, buf, len); | |
896 | buf[len] = '\0'; | |
897 | return len; | |
898 | } | |
899 | ||
188fed95 WD |
900 | /* Populate a sum_struct with values from the socket. This is |
901 | * called by both the sender and the receiver. */ | |
902 | void read_sum_head(int f, struct sum_struct *sum) | |
903 | { | |
904 | sum->count = read_int(f); | |
905 | sum->blength = read_int(f); | |
906 | if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { | |
cdf236aa WD |
907 | rprintf(FERROR, "Invalid block length %ld [%s]\n", |
908 | (long)sum->blength, who_am_i()); | |
188fed95 WD |
909 | exit_cleanup(RERR_PROTOCOL); |
910 | } | |
911 | sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); | |
912 | if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) { | |
cdf236aa WD |
913 | rprintf(FERROR, "Invalid checksum length %d [%s]\n", |
914 | sum->s2length, who_am_i()); | |
188fed95 WD |
915 | exit_cleanup(RERR_PROTOCOL); |
916 | } | |
917 | sum->remainder = read_int(f); | |
918 | if (sum->remainder < 0 || sum->remainder > sum->blength) { | |
cdf236aa WD |
919 | rprintf(FERROR, "Invalid remainder length %ld [%s]\n", |
920 | (long)sum->remainder, who_am_i()); | |
188fed95 WD |
921 | exit_cleanup(RERR_PROTOCOL); |
922 | } | |
923 | } | |
924 | ||
c207d7ec WD |
925 | /* Send the values from a sum_struct over the socket. Set sum to |
926 | * NULL if there are no checksums to send. This is called by both | |
927 | * the generator and the sender. */ | |
928 | void write_sum_head(int f, struct sum_struct *sum) | |
929 | { | |
930 | static struct sum_struct null_sum; | |
931 | ||
932 | if (sum == NULL) | |
933 | sum = &null_sum; | |
934 | ||
935 | write_int(f, sum->count); | |
936 | write_int(f, sum->blength); | |
937 | if (protocol_version >= 27) | |
938 | write_int(f, sum->s2length); | |
939 | write_int(f, sum->remainder); | |
940 | } | |
941 | ||
880da007 | 942 | |
08571358 MP |
943 | /** |
944 | * Sleep after writing to limit I/O bandwidth usage. | |
945 | * | |
946 | * @todo Rather than sleeping after each write, it might be better to | |
947 | * use some kind of averaging. The current algorithm seems to always | |
948 | * use a bit less bandwidth than specified, because it doesn't make up | |
949 | * for slow periods. But arguably this is a feature. In addition, we | |
950 | * ought to take the time used to write the data into account. | |
71e58630 WD |
951 | * |
952 | * During some phases of big transfers (file FOO is uptodate) this is | |
953 | * called with a small bytes_written every time. As the kernel has to | |
954 | * round small waits up to guarantee that we actually wait at least the | |
955 | * requested number of microseconds, this can become grossly inaccurate. | |
956 | * We therefore keep track of the bytes we've written over time and only | |
957 | * sleep when the accumulated delay is at least 1 tenth of a second. | |
08571358 MP |
958 | **/ |
959 | static void sleep_for_bwlimit(int bytes_written) | |
960 | { | |
71e58630 WD |
961 | static struct timeval prior_tv; |
962 | static long total_written = 0; | |
963 | struct timeval tv, start_tv; | |
964 | long elapsed_usec, sleep_usec; | |
965 | ||
966 | #define ONE_SEC 1000000L /* # of microseconds in a second */ | |
08571358 MP |
967 | |
968 | if (!bwlimit) | |
969 | return; | |
e681e820 | 970 | |
71e58630 WD |
971 | total_written += bytes_written; |
972 | ||
973 | gettimeofday(&start_tv, NULL); | |
974 | if (prior_tv.tv_sec) { | |
975 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC | |
976 | + (start_tv.tv_usec - prior_tv.tv_usec); | |
977 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); | |
978 | if (total_written < 0) | |
979 | total_written = 0; | |
980 | } | |
3151cbae | 981 | |
71e58630 WD |
982 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
983 | if (sleep_usec < ONE_SEC / 10) { | |
984 | prior_tv = start_tv; | |
985 | return; | |
986 | } | |
08571358 | 987 | |
71e58630 WD |
988 | tv.tv_sec = sleep_usec / ONE_SEC; |
989 | tv.tv_usec = sleep_usec % ONE_SEC; | |
98b332ed | 990 | select(0, NULL, NULL, NULL, &tv); |
71e58630 WD |
991 | |
992 | gettimeofday(&prior_tv, NULL); | |
993 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC | |
994 | + (prior_tv.tv_usec - start_tv.tv_usec); | |
995 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); | |
08571358 MP |
996 | } |
997 | ||
998 | ||
1f75bb10 | 999 | /* Write len bytes to the file descriptor fd, looping as necessary to get |
af436313 WD |
1000 | * the job done and also (in certain circumstnces) reading any data on |
1001 | * msg_fd_in to avoid deadlock. | |
880da007 MP |
1002 | * |
1003 | * This function underlies the multiplexing system. The body of the | |
1f75bb10 | 1004 | * application never calls this function directly. */ |
9dd891bb | 1005 | static void writefd_unbuffered(int fd,char *buf,size_t len) |
720b47f2 | 1006 | { |
1ea087a7 | 1007 | size_t n, total = 0; |
8d9dc9f9 | 1008 | fd_set w_fds, r_fds; |
1ea087a7 | 1009 | int maxfd, count, ret; |
8d9dc9f9 | 1010 | struct timeval tv; |
720b47f2 | 1011 | |
e44f9a12 AT |
1012 | no_flush++; |
1013 | ||
4c36ddbe | 1014 | while (total < len) { |
8d9dc9f9 | 1015 | FD_ZERO(&w_fds); |
8d9dc9f9 | 1016 | FD_SET(fd,&w_fds); |
1ea087a7 | 1017 | maxfd = fd; |
4c36ddbe | 1018 | |
af436313 | 1019 | if (msg_fd_in >= 0 && len-total >= contiguous_write_len) { |
56014c8c | 1020 | FD_ZERO(&r_fds); |
d17e1dd2 | 1021 | FD_SET(msg_fd_in,&r_fds); |
1ea087a7 WD |
1022 | if (msg_fd_in > maxfd) |
1023 | maxfd = msg_fd_in; | |
8d9dc9f9 | 1024 | } |
41cfde6b WD |
1025 | if (fd != sock_f_out && iobuf_out_cnt && no_flush == 1) { |
1026 | FD_SET(sock_f_out, &w_fds); | |
1027 | if (sock_f_out > maxfd) | |
1028 | maxfd = sock_f_out; | |
1029 | } | |
8d9dc9f9 | 1030 | |
e626b29e | 1031 | tv.tv_sec = select_timeout; |
8d9dc9f9 | 1032 | tv.tv_usec = 0; |
4c36ddbe | 1033 | |
554e0a8d | 1034 | errno = 0; |
1ea087a7 | 1035 | count = select(maxfd + 1, msg_fd_in >= 0 ? &r_fds : NULL, |
d17e1dd2 | 1036 | &w_fds, NULL, &tv); |
4c36ddbe AT |
1037 | |
1038 | if (count <= 0) { | |
1ea087a7 | 1039 | if (count < 0 && errno == EBADF) |
554e0a8d | 1040 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 1041 | check_timeout(); |
8d9dc9f9 AT |
1042 | continue; |
1043 | } | |
4c36ddbe | 1044 | |
d17e1dd2 WD |
1045 | if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds)) |
1046 | read_msg_fd(); | |
554e0a8d | 1047 | |
9a6ed83f | 1048 | if (!FD_ISSET(fd, &w_fds)) |
1ea087a7 | 1049 | continue; |
4c36ddbe | 1050 | |
1ea087a7 WD |
1051 | n = len - total; |
1052 | if (bwlimit && n > bwlimit_writemax) | |
1053 | n = bwlimit_writemax; | |
1054 | ret = write(fd, buf + total, n); | |
1055 | ||
1056 | if (ret <= 0) { | |
3309507d WD |
1057 | if (ret < 0) { |
1058 | if (errno == EINTR) | |
1059 | continue; | |
1060 | if (errno == EWOULDBLOCK || errno == EAGAIN) { | |
1061 | msleep(1); | |
1062 | continue; | |
1063 | } | |
f0359dd0 AT |
1064 | } |
1065 | ||
1ea087a7 | 1066 | /* Don't try to write errors back across the stream. */ |
1f75bb10 | 1067 | if (fd == sock_f_out) |
7f459268 | 1068 | close_multiplexing_out(); |
1ea087a7 | 1069 | rsyserr(FERROR, errno, |
dca68b0a WD |
1070 | "writefd_unbuffered failed to write %ld bytes: phase \"%s\" [%s]", |
1071 | (long)len, io_write_phase, who_am_i()); | |
d1b31da7 WD |
1072 | /* If the other side is sending us error messages, try |
1073 | * to grab any messages they sent before they died. */ | |
7f459268 | 1074 | while (fd == sock_f_out && io_multiplexing_in) { |
ef0c03ff | 1075 | io_timeout = select_timeout = 30; |
9e2409ab | 1076 | ignore_timeout = 0; |
d1b31da7 WD |
1077 | readfd_unbuffered(sock_f_in, io_filesfrom_buf, |
1078 | sizeof io_filesfrom_buf); | |
1079 | } | |
1ea087a7 WD |
1080 | exit_cleanup(RERR_STREAMIO); |
1081 | } | |
4c36ddbe | 1082 | |
1ea087a7 | 1083 | total += ret; |
a800434a | 1084 | |
1f75bb10 WD |
1085 | if (fd == sock_f_out) { |
1086 | if (io_timeout) | |
1087 | last_io = time(NULL); | |
1088 | sleep_for_bwlimit(ret); | |
1089 | } | |
4c36ddbe | 1090 | } |
e44f9a12 AT |
1091 | |
1092 | no_flush--; | |
720b47f2 AT |
1093 | } |
1094 | ||
8d9dc9f9 | 1095 | |
880da007 MP |
1096 | /** |
1097 | * Write an message to a multiplexed stream. If this fails then rsync | |
1098 | * exits. | |
1099 | **/ | |
1f75bb10 | 1100 | static void mplex_write(enum msgcode code, char *buf, size_t len) |
ff41a59f AT |
1101 | { |
1102 | char buffer[4096]; | |
06ce139f | 1103 | size_t n = len; |
8d9dc9f9 | 1104 | |
ff41a59f AT |
1105 | SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); |
1106 | ||
af436313 WD |
1107 | /* When the generator reads messages from the msg_fd_in pipe, it can |
1108 | * cause output to occur down the socket. Setting contiguous_write_len | |
1109 | * prevents the reading of msg_fd_in once we actually start to write | |
1110 | * this sequence of data (though we might read it before the start). */ | |
1111 | if (am_generator && msg_fd_in >= 0) | |
1112 | contiguous_write_len = len + 4; | |
1113 | ||
c399d22a | 1114 | if (n > sizeof buffer - 4) |
3151cbae | 1115 | n = sizeof buffer - 4; |
ff41a59f AT |
1116 | |
1117 | memcpy(&buffer[4], buf, n); | |
1f75bb10 | 1118 | writefd_unbuffered(sock_f_out, buffer, n+4); |
ff41a59f AT |
1119 | |
1120 | len -= n; | |
1121 | buf += n; | |
1122 | ||
1ea087a7 | 1123 | if (len) |
1f75bb10 | 1124 | writefd_unbuffered(sock_f_out, buf, len); |
af436313 WD |
1125 | |
1126 | if (am_generator && msg_fd_in >= 0) | |
1127 | contiguous_write_len = 0; | |
d6dead6b AT |
1128 | } |
1129 | ||
ff41a59f | 1130 | |
d17e1dd2 | 1131 | void io_flush(int flush_it_all) |
d6dead6b | 1132 | { |
d17e1dd2 | 1133 | msg_list_push(flush_it_all); |
90ba34e2 | 1134 | |
1f75bb10 | 1135 | if (!iobuf_out_cnt || no_flush) |
d17e1dd2 | 1136 | return; |
8d9dc9f9 | 1137 | |
d17e1dd2 | 1138 | if (io_multiplexing_out) |
1f75bb10 | 1139 | mplex_write(MSG_DATA, iobuf_out, iobuf_out_cnt); |
d17e1dd2 | 1140 | else |
1f75bb10 WD |
1141 | writefd_unbuffered(sock_f_out, iobuf_out, iobuf_out_cnt); |
1142 | iobuf_out_cnt = 0; | |
8d9dc9f9 AT |
1143 | } |
1144 | ||
0ba48136 | 1145 | |
9dd891bb | 1146 | static void writefd(int fd,char *buf,size_t len) |
d6dead6b | 1147 | { |
4033b80b WD |
1148 | if (fd == msg_fd_out) { |
1149 | rprintf(FERROR, "Internal error: wrong write used in receiver.\n"); | |
1150 | exit_cleanup(RERR_PROTOCOL); | |
1151 | } | |
90ba34e2 | 1152 | |
1f75bb10 WD |
1153 | if (fd == sock_f_out) |
1154 | stats.total_written += len; | |
1155 | ||
b9f592fb WD |
1156 | if (fd == write_batch_monitor_out) { |
1157 | if ((size_t)write(batch_fd, buf, len) != len) | |
1158 | exit_cleanup(RERR_FILEIO); | |
1159 | } | |
1160 | ||
1f75bb10 | 1161 | if (!iobuf_out || fd != sock_f_out) { |
4c36ddbe AT |
1162 | writefd_unbuffered(fd, buf, len); |
1163 | return; | |
1164 | } | |
d6dead6b AT |
1165 | |
1166 | while (len) { | |
1f75bb10 | 1167 | int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt); |
d6dead6b | 1168 | if (n > 0) { |
1f75bb10 | 1169 | memcpy(iobuf_out+iobuf_out_cnt, buf, n); |
d6dead6b AT |
1170 | buf += n; |
1171 | len -= n; | |
1f75bb10 | 1172 | iobuf_out_cnt += n; |
d6dead6b | 1173 | } |
3151cbae | 1174 | |
1f75bb10 | 1175 | if (iobuf_out_cnt == IO_BUFFER_SIZE) |
d17e1dd2 | 1176 | io_flush(NORMAL_FLUSH); |
d6dead6b | 1177 | } |
d6dead6b | 1178 | } |
720b47f2 AT |
1179 | |
1180 | ||
0d67e00a | 1181 | void write_shortint(int f, int x) |
9361f839 WD |
1182 | { |
1183 | uchar b[2]; | |
1184 | b[0] = x; | |
1185 | b[1] = x >> 8; | |
1186 | writefd(f, (char *)b, 2); | |
1187 | } | |
1188 | ||
1189 | ||
b7922338 | 1190 | void write_int(int f,int32 x) |
720b47f2 | 1191 | { |
8d9dc9f9 AT |
1192 | char b[4]; |
1193 | SIVAL(b,0,x); | |
4c36ddbe | 1194 | writefd(f,b,4); |
720b47f2 AT |
1195 | } |
1196 | ||
7a24c346 | 1197 | |
805edf9d MP |
1198 | void write_int_named(int f, int32 x, const char *phase) |
1199 | { | |
1200 | io_write_phase = phase; | |
1201 | write_int(f, x); | |
1202 | io_write_phase = phase_unknown; | |
1203 | } | |
1204 | ||
1205 | ||
7a24c346 MP |
1206 | /* |
1207 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any | |
1208 | * 64-bit types on this platform. | |
1209 | */ | |
71c46176 | 1210 | void write_longint(int f, int64 x) |
3a6a366f | 1211 | { |
3a6a366f | 1212 | char b[8]; |
3a6a366f | 1213 | |
91c4da3f | 1214 | if (x <= 0x7FFFFFFF) { |
3a6a366f AT |
1215 | write_int(f, (int)x); |
1216 | return; | |
1217 | } | |
1218 | ||
031fa9ad WD |
1219 | #if SIZEOF_INT64 < 8 |
1220 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1221 | exit_cleanup(RERR_UNSUPPORTED); | |
1222 | #else | |
8de330a3 | 1223 | write_int(f, (int32)0xFFFFFFFF); |
3a6a366f AT |
1224 | SIVAL(b,0,(x&0xFFFFFFFF)); |
1225 | SIVAL(b,4,((x>>32)&0xFFFFFFFF)); | |
1226 | ||
4c36ddbe | 1227 | writefd(f,b,8); |
031fa9ad | 1228 | #endif |
3a6a366f AT |
1229 | } |
1230 | ||
9dd891bb | 1231 | void write_buf(int f,char *buf,size_t len) |
720b47f2 | 1232 | { |
4c36ddbe | 1233 | writefd(f,buf,len); |
720b47f2 AT |
1234 | } |
1235 | ||
880da007 | 1236 | /** Write a string to the connection */ |
cf338ab1 | 1237 | void write_sbuf(int f, char *buf) |
f0fca04e | 1238 | { |
93095cbe | 1239 | writefd(f, buf, strlen(buf)); |
f0fca04e AT |
1240 | } |
1241 | ||
9361f839 | 1242 | void write_byte(int f, uchar c) |
182dca5c | 1243 | { |
93095cbe | 1244 | writefd(f, (char *)&c, 1); |
182dca5c AT |
1245 | } |
1246 | ||
46e99b09 WD |
1247 | void write_vstring(int f, char *str, int len) |
1248 | { | |
1249 | uchar lenbuf[3], *lb = lenbuf; | |
1250 | ||
1251 | if (len > 0x7F) { | |
1252 | if (len > 0x7FFF) { | |
1253 | rprintf(FERROR, | |
1254 | "attempting to send over-long vstring (%d > %d)\n", | |
1255 | len, 0x7FFF); | |
1256 | exit_cleanup(RERR_PROTOCOL); | |
1257 | } | |
1258 | *lb++ = len / 0x100 + 0x80; | |
1259 | } | |
1260 | *lb = len; | |
1261 | ||
1262 | writefd(f, (char*)lenbuf, lb - lenbuf + 1); | |
1263 | if (len) | |
1264 | writefd(f, str, len); | |
1265 | } | |
1266 | ||
7a55d06e | 1267 | |
914cc65c | 1268 | /** |
6ed6d7f5 WD |
1269 | * Read a line of up to @p maxlen characters into @p buf (not counting |
1270 | * the trailing null). Strips the (required) trailing newline and all | |
1271 | * carriage returns. | |
914cc65c | 1272 | * |
6ed6d7f5 | 1273 | * @return 1 for success; 0 for I/O error or truncation. |
914cc65c | 1274 | **/ |
9dd891bb | 1275 | int read_line(int f, char *buf, size_t maxlen) |
f0fca04e AT |
1276 | { |
1277 | while (maxlen) { | |
528bfcd7 | 1278 | buf[0] = 0; |
f0fca04e | 1279 | read_buf(f, buf, 1); |
914cc65c MP |
1280 | if (buf[0] == 0) |
1281 | return 0; | |
6ed6d7f5 | 1282 | if (buf[0] == '\n') |
f0fca04e | 1283 | break; |
f0fca04e AT |
1284 | if (buf[0] != '\r') { |
1285 | buf++; | |
1286 | maxlen--; | |
1287 | } | |
1288 | } | |
6ed6d7f5 WD |
1289 | *buf = '\0'; |
1290 | return maxlen > 0; | |
f0fca04e AT |
1291 | } |
1292 | ||
1293 | ||
1294 | void io_printf(int fd, const char *format, ...) | |
1295 | { | |
d62bcc17 | 1296 | va_list ap; |
f0fca04e AT |
1297 | char buf[1024]; |
1298 | int len; | |
3151cbae | 1299 | |
f0fca04e | 1300 | va_start(ap, format); |
3151cbae | 1301 | len = vsnprintf(buf, sizeof buf, format, ap); |
f0fca04e AT |
1302 | va_end(ap); |
1303 | ||
f89b9368 WD |
1304 | if (len < 0) |
1305 | exit_cleanup(RERR_STREAMIO); | |
f0fca04e AT |
1306 | |
1307 | write_sbuf(fd, buf); | |
1308 | } | |
8d9dc9f9 AT |
1309 | |
1310 | ||
d17e1dd2 | 1311 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1312 | void io_start_multiplex_out(void) |
8d9dc9f9 | 1313 | { |
d17e1dd2 | 1314 | io_flush(NORMAL_FLUSH); |
1f75bb10 | 1315 | io_start_buffering_out(); |
8d9dc9f9 AT |
1316 | io_multiplexing_out = 1; |
1317 | } | |
1318 | ||
d17e1dd2 | 1319 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1320 | void io_start_multiplex_in(void) |
8d9dc9f9 | 1321 | { |
d17e1dd2 | 1322 | io_flush(NORMAL_FLUSH); |
1f75bb10 | 1323 | io_start_buffering_in(); |
8d9dc9f9 AT |
1324 | io_multiplexing_in = 1; |
1325 | } | |
1326 | ||
d17e1dd2 WD |
1327 | /** Write an message to the multiplexed data stream. */ |
1328 | int io_multiplex_write(enum msgcode code, char *buf, size_t len) | |
8d9dc9f9 | 1329 | { |
f89b9368 WD |
1330 | if (!io_multiplexing_out) |
1331 | return 0; | |
8d9dc9f9 | 1332 | |
d17e1dd2 | 1333 | io_flush(NORMAL_FLUSH); |
1b7c47cb | 1334 | stats.total_written += (len+4); |
1f75bb10 | 1335 | mplex_write(code, buf, len); |
8d9dc9f9 AT |
1336 | return 1; |
1337 | } | |
1338 | ||
7f459268 WD |
1339 | void close_multiplexing_in(void) |
1340 | { | |
1341 | io_multiplexing_in = 0; | |
1342 | } | |
1343 | ||
d17e1dd2 | 1344 | /** Stop output multiplexing. */ |
7f459268 | 1345 | void close_multiplexing_out(void) |
554e0a8d AT |
1346 | { |
1347 | io_multiplexing_out = 0; | |
1348 | } | |
1349 | ||
b9f592fb WD |
1350 | void start_write_batch(int fd) |
1351 | { | |
741d6544 WD |
1352 | write_stream_flags(batch_fd); |
1353 | ||
b9f592fb WD |
1354 | /* Some communication has already taken place, but we don't |
1355 | * enable batch writing until here so that we can write a | |
1356 | * canonical record of the communication even though the | |
1357 | * actual communication so far depends on whether a daemon | |
1358 | * is involved. */ | |
1359 | write_int(batch_fd, protocol_version); | |
1360 | write_int(batch_fd, checksum_seed); | |
b9f592fb WD |
1361 | |
1362 | if (am_sender) | |
1363 | write_batch_monitor_out = fd; | |
1364 | else | |
1365 | write_batch_monitor_in = fd; | |
1366 | } | |
1367 | ||
1368 | void stop_write_batch(void) | |
1369 | { | |
1370 | write_batch_monitor_out = -1; | |
1371 | write_batch_monitor_in = -1; | |
1372 | } |