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; |
d17e1dd2 WD |
46 | extern int am_server; |
47 | extern int am_daemon; | |
48 | extern int am_sender; | |
98f8c9a5 | 49 | extern int am_generator; |
e626b29e | 50 | extern int eol_nulls; |
188fed95 | 51 | extern int csum_length; |
b9f592fb WD |
52 | extern int checksum_seed; |
53 | extern int protocol_version; | |
d19320fd | 54 | extern char *filesfrom_host; |
a800434a | 55 | extern struct stats stats; |
720b47f2 | 56 | |
a86179f4 | 57 | const char phase_unknown[] = "unknown"; |
e626b29e | 58 | int select_timeout = SELECT_TIMEOUT; |
9e2409ab | 59 | int ignore_timeout = 0; |
b9f592fb | 60 | int batch_fd = -1; |
b0ad5429 | 61 | int batch_gen_fd = -1; |
805edf9d | 62 | |
98b332ed MP |
63 | /** |
64 | * The connection might be dropped at some point; perhaps because the | |
65 | * remote instance crashed. Just giving the offset on the stream is | |
66 | * not very helpful. So instead we try to make io_phase_name point to | |
67 | * something useful. | |
eca2adb4 | 68 | * |
6ed6d7f5 | 69 | * For buffered/multiplexed I/O these names will be somewhat |
805edf9d | 70 | * approximate; perhaps for ease of support we would rather make the |
6ed6d7f5 | 71 | * buffer always flush when a single application-level I/O finishes. |
805edf9d | 72 | * |
eca2adb4 MP |
73 | * @todo Perhaps we want some simple stack functionality, but there's |
74 | * no need to overdo it. | |
98b332ed | 75 | **/ |
805edf9d MP |
76 | const char *io_write_phase = phase_unknown; |
77 | const char *io_read_phase = phase_unknown; | |
98b332ed | 78 | |
cb2e1f18 | 79 | /* Ignore an EOF error if non-zero. See whine_about_eof(). */ |
574c2500 | 80 | int kluge_around_eof = 0; |
7a55d06e | 81 | |
d17e1dd2 WD |
82 | int msg_fd_in = -1; |
83 | int msg_fd_out = -1; | |
7a55d06e | 84 | |
1f75bb10 WD |
85 | static int io_multiplexing_out; |
86 | static int io_multiplexing_in; | |
87 | static int sock_f_in = -1; | |
88 | static int sock_f_out = -1; | |
89 | static time_t last_io; | |
90 | static int no_flush; | |
91 | ||
b9f592fb WD |
92 | static int write_batch_monitor_in = -1; |
93 | static int write_batch_monitor_out = -1; | |
94 | ||
56014c8c WD |
95 | static int io_filesfrom_f_in = -1; |
96 | static int io_filesfrom_f_out = -1; | |
97 | static char io_filesfrom_buf[2048]; | |
98 | static char *io_filesfrom_bp; | |
99 | static char io_filesfrom_lastchar; | |
100 | static int io_filesfrom_buflen; | |
af436313 | 101 | static size_t contiguous_write_len = 0; |
720b47f2 | 102 | |
9dd891bb | 103 | static void read_loop(int fd, char *buf, size_t len); |
ff41a59f | 104 | |
c6816b94 WD |
105 | struct flist_ndx_item { |
106 | struct flist_ndx_item *next; | |
107 | int ndx; | |
d17e1dd2 WD |
108 | }; |
109 | ||
c6816b94 WD |
110 | struct flist_ndx_list { |
111 | struct flist_ndx_item *head, *tail; | |
112 | }; | |
113 | ||
114 | static struct flist_ndx_list redo_list; | |
d17e1dd2 WD |
115 | |
116 | struct msg_list { | |
117 | struct msg_list *next; | |
118 | char *buf; | |
119 | int len; | |
120 | }; | |
121 | ||
122 | static struct msg_list *msg_list_head; | |
123 | static struct msg_list *msg_list_tail; | |
124 | ||
c6816b94 | 125 | static void flist_ndx_push(struct flist_ndx_list *lp, int ndx) |
d17e1dd2 | 126 | { |
c6816b94 WD |
127 | struct flist_ndx_item *item; |
128 | ||
129 | if (!(item = new(struct flist_ndx_item))) | |
130 | out_of_memory("flist_ndx_push"); | |
131 | item->next = NULL; | |
132 | item->ndx = ndx; | |
133 | if (lp->tail) | |
134 | lp->tail->next = item; | |
d17e1dd2 | 135 | else |
c6816b94 WD |
136 | lp->head = item; |
137 | lp->tail = item; | |
138 | } | |
139 | ||
140 | static int flist_ndx_pop(struct flist_ndx_list *lp) | |
141 | { | |
142 | struct flist_ndx_item *next; | |
143 | int ndx; | |
144 | ||
145 | if (!lp->head) | |
146 | return -1; | |
147 | ||
148 | ndx = lp->head->ndx; | |
149 | next = lp->head->next; | |
150 | free(lp->head); | |
151 | lp->head = next; | |
152 | if (!next) | |
153 | lp->tail = NULL; | |
154 | ||
155 | return ndx; | |
d17e1dd2 WD |
156 | } |
157 | ||
8d9dc9f9 AT |
158 | static void check_timeout(void) |
159 | { | |
160 | time_t t; | |
90ba34e2 | 161 | |
9e2409ab | 162 | if (!io_timeout || ignore_timeout) |
d17e1dd2 | 163 | return; |
8d9dc9f9 AT |
164 | |
165 | if (!last_io) { | |
166 | last_io = time(NULL); | |
167 | return; | |
168 | } | |
169 | ||
170 | t = time(NULL); | |
171 | ||
1f75bb10 | 172 | if (t - last_io >= io_timeout) { |
0adb99b9 | 173 | if (!am_server && !am_daemon) { |
4ccfd96c | 174 | rprintf(FERROR, "io timeout after %d seconds -- exiting\n", |
0adb99b9 AT |
175 | (int)(t-last_io)); |
176 | } | |
65417579 | 177 | exit_cleanup(RERR_TIMEOUT); |
8d9dc9f9 AT |
178 | } |
179 | } | |
180 | ||
1f75bb10 WD |
181 | /* Note the fds used for the main socket (which might really be a pipe |
182 | * for a local transfer, but we can ignore that). */ | |
183 | void io_set_sock_fds(int f_in, int f_out) | |
184 | { | |
185 | sock_f_in = f_in; | |
186 | sock_f_out = f_out; | |
187 | } | |
188 | ||
98f8c9a5 WD |
189 | /* Setup the fd used to receive MSG_* messages. Only needed during the |
190 | * early stages of being a local sender (up through the sending of the | |
191 | * file list) or when we're the generator (to fetch the messages from | |
192 | * the receiver). */ | |
d17e1dd2 WD |
193 | void set_msg_fd_in(int fd) |
194 | { | |
195 | msg_fd_in = fd; | |
196 | } | |
197 | ||
98f8c9a5 WD |
198 | /* Setup the fd used to send our MSG_* messages. Only needed when |
199 | * we're the receiver (to send our messages to the generator). */ | |
d17e1dd2 WD |
200 | void set_msg_fd_out(int fd) |
201 | { | |
202 | msg_fd_out = fd; | |
203 | set_nonblocking(msg_fd_out); | |
204 | } | |
205 | ||
206 | /* Add a message to the pending MSG_* list. */ | |
207 | static void msg_list_add(int code, char *buf, int len) | |
554e0a8d | 208 | { |
d17e1dd2 WD |
209 | struct msg_list *ml; |
210 | ||
211 | if (!(ml = new(struct msg_list))) | |
c6816b94 | 212 | out_of_memory("msg_list_add"); |
d17e1dd2 WD |
213 | ml->next = NULL; |
214 | if (!(ml->buf = new_array(char, len+4))) | |
c6816b94 | 215 | out_of_memory("msg_list_add"); |
d17e1dd2 WD |
216 | SIVAL(ml->buf, 0, ((code+MPLEX_BASE)<<24) | len); |
217 | memcpy(ml->buf+4, buf, len); | |
218 | ml->len = len+4; | |
219 | if (msg_list_tail) | |
220 | msg_list_tail->next = ml; | |
221 | else | |
222 | msg_list_head = ml; | |
223 | msg_list_tail = ml; | |
554e0a8d AT |
224 | } |
225 | ||
d17e1dd2 WD |
226 | void send_msg(enum msgcode code, char *buf, int len) |
227 | { | |
0d67e00a WD |
228 | if (msg_fd_out < 0) { |
229 | io_multiplex_write(code, buf, len); | |
230 | return; | |
231 | } | |
d17e1dd2 WD |
232 | msg_list_add(code, buf, len); |
233 | msg_list_push(NORMAL_FLUSH); | |
234 | } | |
235 | ||
98f8c9a5 WD |
236 | /* Read a message from the MSG_* fd and handle it. This is called either |
237 | * during the early stages of being a local sender (up through the sending | |
238 | * of the file list) or when we're the generator (to fetch the messages | |
239 | * from the receiver). */ | |
d17e1dd2 | 240 | static void read_msg_fd(void) |
554e0a8d | 241 | { |
f9c6b3e7 | 242 | char buf[2048]; |
06ce139f | 243 | size_t n; |
d17e1dd2 | 244 | int fd = msg_fd_in; |
ff41a59f AT |
245 | int tag, len; |
246 | ||
00bdf899 | 247 | /* Temporarily disable msg_fd_in. This is needed to avoid looping back |
af436313 | 248 | * to this routine from writefd_unbuffered(). */ |
d17e1dd2 | 249 | msg_fd_in = -1; |
554e0a8d | 250 | |
ff41a59f AT |
251 | read_loop(fd, buf, 4); |
252 | tag = IVAL(buf, 0); | |
253 | ||
254 | len = tag & 0xFFFFFF; | |
d17e1dd2 | 255 | tag = (tag >> 24) - MPLEX_BASE; |
ff41a59f | 256 | |
d17e1dd2 WD |
257 | switch (tag) { |
258 | case MSG_DONE: | |
98f8c9a5 | 259 | if (len != 0 || !am_generator) { |
13c7bcbb | 260 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
d17e1dd2 | 261 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 262 | } |
c6816b94 | 263 | flist_ndx_push(&redo_list, -1); |
d17e1dd2 WD |
264 | break; |
265 | case MSG_REDO: | |
98f8c9a5 | 266 | if (len != 4 || !am_generator) { |
13c7bcbb | 267 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
d17e1dd2 | 268 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 269 | } |
d17e1dd2 | 270 | read_loop(fd, buf, 4); |
c6816b94 | 271 | flist_ndx_push(&redo_list, IVAL(buf,0)); |
d17e1dd2 | 272 | break; |
0d67e00a WD |
273 | case MSG_DELETED: |
274 | if (len >= (int)sizeof buf || !am_generator) { | |
275 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); | |
276 | exit_cleanup(RERR_STREAMIO); | |
277 | } | |
278 | read_loop(fd, buf, len); | |
279 | io_multiplex_write(MSG_DELETED, buf, len); | |
280 | break; | |
9981c27e WD |
281 | case MSG_SUCCESS: |
282 | if (len != 4 || !am_generator) { | |
283 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); | |
284 | exit_cleanup(RERR_STREAMIO); | |
285 | } | |
286 | read_loop(fd, buf, len); | |
287 | io_multiplex_write(MSG_SUCCESS, buf, len); | |
288 | break; | |
d17e1dd2 WD |
289 | case MSG_INFO: |
290 | case MSG_ERROR: | |
291 | case MSG_LOG: | |
292 | while (len) { | |
293 | n = len; | |
294 | if (n >= sizeof buf) | |
295 | n = sizeof buf - 1; | |
296 | read_loop(fd, buf, n); | |
297 | rwrite((enum logcode)tag, buf, n); | |
298 | len -= n; | |
299 | } | |
300 | break; | |
301 | default: | |
13c7bcbb | 302 | rprintf(FERROR, "unknown message %d:%d\n", tag, len); |
d17e1dd2 WD |
303 | exit_cleanup(RERR_STREAMIO); |
304 | } | |
305 | ||
306 | msg_fd_in = fd; | |
307 | } | |
308 | ||
309 | /* Try to push messages off the list onto the wire. If we leave with more | |
310 | * to do, return 0. On error, return -1. If everything flushed, return 1. | |
f9c6b3e7 | 311 | * This is only active in the receiver. */ |
d17e1dd2 WD |
312 | int msg_list_push(int flush_it_all) |
313 | { | |
314 | static int written = 0; | |
315 | struct timeval tv; | |
316 | fd_set fds; | |
317 | ||
318 | if (msg_fd_out < 0) | |
319 | return -1; | |
320 | ||
321 | while (msg_list_head) { | |
322 | struct msg_list *ml = msg_list_head; | |
323 | int n = write(msg_fd_out, ml->buf + written, ml->len - written); | |
324 | if (n < 0) { | |
325 | if (errno == EINTR) | |
326 | continue; | |
327 | if (errno != EWOULDBLOCK && errno != EAGAIN) | |
328 | return -1; | |
329 | if (!flush_it_all) | |
330 | return 0; | |
331 | FD_ZERO(&fds); | |
332 | FD_SET(msg_fd_out, &fds); | |
e626b29e | 333 | tv.tv_sec = select_timeout; |
d17e1dd2 WD |
334 | tv.tv_usec = 0; |
335 | if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv)) | |
336 | check_timeout(); | |
337 | } else if ((written += n) == ml->len) { | |
338 | free(ml->buf); | |
339 | msg_list_head = ml->next; | |
340 | if (!msg_list_head) | |
341 | msg_list_tail = NULL; | |
342 | free(ml); | |
343 | written = 0; | |
344 | } | |
554e0a8d | 345 | } |
d17e1dd2 WD |
346 | return 1; |
347 | } | |
348 | ||
349 | int get_redo_num(void) | |
350 | { | |
c6816b94 | 351 | while (!redo_list.head) { |
d17e1dd2 | 352 | read_msg_fd(); |
c6816b94 | 353 | } |
554e0a8d | 354 | |
c6816b94 | 355 | return flist_ndx_pop(&redo_list); |
554e0a8d AT |
356 | } |
357 | ||
56014c8c WD |
358 | /** |
359 | * When we're the receiver and we have a local --files-from list of names | |
360 | * that needs to be sent over the socket to the sender, we have to do two | |
361 | * things at the same time: send the sender a list of what files we're | |
362 | * processing and read the incoming file+info list from the sender. We do | |
363 | * this by augmenting the read_timeout() function to copy this data. It | |
364 | * uses the io_filesfrom_buf to read a block of data from f_in (when it is | |
365 | * ready, since it might be a pipe) and then blast it out f_out (when it | |
366 | * is ready to receive more data). | |
367 | */ | |
368 | void io_set_filesfrom_fds(int f_in, int f_out) | |
369 | { | |
370 | io_filesfrom_f_in = f_in; | |
371 | io_filesfrom_f_out = f_out; | |
372 | io_filesfrom_bp = io_filesfrom_buf; | |
373 | io_filesfrom_lastchar = '\0'; | |
374 | io_filesfrom_buflen = 0; | |
375 | } | |
720b47f2 | 376 | |
cb2e1f18 WD |
377 | /* It's almost always an error to get an EOF when we're trying to read from the |
378 | * network, because the protocol is (for the most part) self-terminating. | |
880da007 | 379 | * |
cb2e1f18 WD |
380 | * There is one case for the receiver when it is at the end of the transfer |
381 | * (hanging around reading any keep-alive packets that might come its way): if | |
382 | * the sender dies before the generator's kill-signal comes through, we can end | |
383 | * up here needing to loop until the kill-signal arrives. In this situation, | |
384 | * kluge_around_eof will be < 0. | |
385 | * | |
386 | * There is another case for older protocol versions (< 24) where the module | |
387 | * listing was not terminated, so we must ignore an EOF error in that case and | |
388 | * exit. In this situation, kluge_around_eof will be > 0. */ | |
1f75bb10 | 389 | static void whine_about_eof(int fd) |
7a55d06e | 390 | { |
574c2500 | 391 | if (kluge_around_eof && fd == sock_f_in) { |
55bb7fff | 392 | int i; |
574c2500 WD |
393 | if (kluge_around_eof > 0) |
394 | exit_cleanup(0); | |
55bb7fff WD |
395 | /* If we're still here after 10 seconds, exit with an error. */ |
396 | for (i = 10*1000/20; i--; ) | |
574c2500 WD |
397 | msleep(20); |
398 | } | |
3151cbae | 399 | |
00bdf899 | 400 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
dca68b0a WD |
401 | "(%.0f bytes received so far) [%s]\n", |
402 | (double)stats.total_read, who_am_i()); | |
00bdf899 WD |
403 | |
404 | exit_cleanup(RERR_STREAMIO); | |
7a55d06e | 405 | } |
720b47f2 | 406 | |
7a55d06e | 407 | |
880da007 | 408 | /** |
6ed6d7f5 | 409 | * Read from a socket with I/O timeout. return the number of bytes |
c3563c46 MP |
410 | * read. If no bytes can be read then exit, never return a number <= 0. |
411 | * | |
8886f8d0 MP |
412 | * TODO: If the remote shell connection fails, then current versions |
413 | * actually report an "unexpected EOF" error here. Since it's a | |
414 | * fairly common mistake to try to use rsh when ssh is required, we | |
415 | * should trap that: if we fail to read any data at all, we should | |
416 | * give a better explanation. We can tell whether the connection has | |
417 | * started by looking e.g. at whether the remote version is known yet. | |
c3563c46 | 418 | */ |
3151cbae | 419 | static int read_timeout(int fd, char *buf, size_t len) |
8d9dc9f9 | 420 | { |
d62bcc17 | 421 | int n, ret = 0; |
4c36ddbe | 422 | |
d17e1dd2 | 423 | io_flush(NORMAL_FLUSH); |
ea2111d1 | 424 | |
4c36ddbe | 425 | while (ret == 0) { |
7a55d06e | 426 | /* until we manage to read *something* */ |
56014c8c | 427 | fd_set r_fds, w_fds; |
4c36ddbe | 428 | struct timeval tv; |
1ea087a7 | 429 | int maxfd = fd; |
a57873b7 | 430 | int count; |
4c36ddbe | 431 | |
56014c8c | 432 | FD_ZERO(&r_fds); |
a7026ba9 | 433 | FD_ZERO(&w_fds); |
56014c8c | 434 | FD_SET(fd, &r_fds); |
af436313 | 435 | if (msg_list_head) { |
4033b80b | 436 | FD_SET(msg_fd_out, &w_fds); |
1ea087a7 WD |
437 | if (msg_fd_out > maxfd) |
438 | maxfd = msg_fd_out; | |
56014c8c | 439 | } |
3309507d | 440 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
441 | int new_fd; |
442 | if (io_filesfrom_buflen == 0) { | |
3309507d | 443 | if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
444 | FD_SET(io_filesfrom_f_in, &r_fds); |
445 | new_fd = io_filesfrom_f_in; | |
446 | } else { | |
447 | io_filesfrom_f_out = -1; | |
448 | new_fd = -1; | |
449 | } | |
450 | } else { | |
56014c8c WD |
451 | FD_SET(io_filesfrom_f_out, &w_fds); |
452 | new_fd = io_filesfrom_f_out; | |
453 | } | |
1ea087a7 WD |
454 | if (new_fd > maxfd) |
455 | maxfd = new_fd; | |
554e0a8d AT |
456 | } |
457 | ||
e626b29e | 458 | tv.tv_sec = select_timeout; |
4c36ddbe AT |
459 | tv.tv_usec = 0; |
460 | ||
554e0a8d AT |
461 | errno = 0; |
462 | ||
a7026ba9 | 463 | count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); |
a57873b7 | 464 | |
a57873b7 | 465 | if (count <= 0) { |
f89b9368 | 466 | if (errno == EBADF) |
554e0a8d | 467 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 468 | check_timeout(); |
4c36ddbe AT |
469 | continue; |
470 | } | |
471 | ||
af436313 | 472 | if (msg_list_head && FD_ISSET(msg_fd_out, &w_fds)) |
4033b80b | 473 | msg_list_push(NORMAL_FLUSH); |
554e0a8d | 474 | |
3309507d | 475 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
476 | if (io_filesfrom_buflen) { |
477 | if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { | |
478 | int l = write(io_filesfrom_f_out, | |
479 | io_filesfrom_bp, | |
480 | io_filesfrom_buflen); | |
481 | if (l > 0) { | |
482 | if (!(io_filesfrom_buflen -= l)) | |
483 | io_filesfrom_bp = io_filesfrom_buf; | |
484 | else | |
485 | io_filesfrom_bp += l; | |
486 | } else { | |
487 | /* XXX should we complain? */ | |
488 | io_filesfrom_f_out = -1; | |
489 | } | |
490 | } | |
3309507d | 491 | } else if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
492 | if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { |
493 | int l = read(io_filesfrom_f_in, | |
494 | io_filesfrom_buf, | |
495 | sizeof io_filesfrom_buf); | |
496 | if (l <= 0) { | |
497 | /* Send end-of-file marker */ | |
498 | io_filesfrom_buf[0] = '\0'; | |
499 | io_filesfrom_buf[1] = '\0'; | |
500 | io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1; | |
501 | io_filesfrom_f_in = -1; | |
502 | } else { | |
56014c8c WD |
503 | if (!eol_nulls) { |
504 | char *s = io_filesfrom_buf + l; | |
505 | /* Transform CR and/or LF into '\0' */ | |
506 | while (s-- > io_filesfrom_buf) { | |
507 | if (*s == '\n' || *s == '\r') | |
508 | *s = '\0'; | |
509 | } | |
510 | } | |
511 | if (!io_filesfrom_lastchar) { | |
512 | /* Last buf ended with a '\0', so don't | |
513 | * let this buf start with one. */ | |
514 | while (l && !*io_filesfrom_bp) | |
515 | io_filesfrom_bp++, l--; | |
516 | } | |
517 | if (!l) | |
518 | io_filesfrom_bp = io_filesfrom_buf; | |
519 | else { | |
520 | char *f = io_filesfrom_bp; | |
521 | char *t = f; | |
522 | char *eob = f + l; | |
523 | /* Eliminate any multi-'\0' runs. */ | |
524 | while (f != eob) { | |
525 | if (!(*t++ = *f++)) { | |
526 | while (f != eob && !*f) | |
527 | f++, l--; | |
528 | } | |
529 | } | |
530 | io_filesfrom_lastchar = f[-1]; | |
531 | } | |
532 | io_filesfrom_buflen = l; | |
533 | } | |
534 | } | |
535 | } | |
536 | } | |
537 | ||
f89b9368 WD |
538 | if (!FD_ISSET(fd, &r_fds)) |
539 | continue; | |
554e0a8d | 540 | |
4c36ddbe AT |
541 | n = read(fd, buf, len); |
542 | ||
1ea087a7 WD |
543 | if (n <= 0) { |
544 | if (n == 0) | |
1f75bb10 | 545 | whine_about_eof(fd); /* Doesn't return. */ |
d62bcc17 WD |
546 | if (errno == EINTR || errno == EWOULDBLOCK |
547 | || errno == EAGAIN) | |
7a55d06e | 548 | continue; |
1f75bb10 WD |
549 | |
550 | /* Don't write errors on a dead socket. */ | |
551 | if (fd == sock_f_in) | |
7f459268 | 552 | close_multiplexing_out(); |
1f75bb10 WD |
553 | rsyserr(FERROR, errno, "read error"); |
554 | exit_cleanup(RERR_STREAMIO); | |
8d9dc9f9 | 555 | } |
00bdf899 WD |
556 | |
557 | buf += n; | |
558 | len -= n; | |
559 | ret += n; | |
1f75bb10 WD |
560 | |
561 | if (io_timeout && fd == sock_f_in) | |
00bdf899 | 562 | last_io = time(NULL); |
4c36ddbe | 563 | } |
8d9dc9f9 | 564 | |
4c36ddbe AT |
565 | return ret; |
566 | } | |
8d9dc9f9 | 567 | |
56014c8c WD |
568 | /** |
569 | * Read a line into the "fname" buffer (which must be at least MAXPATHLEN | |
570 | * characters long). | |
571 | */ | |
572 | int read_filesfrom_line(int fd, char *fname) | |
573 | { | |
574 | char ch, *s, *eob = fname + MAXPATHLEN - 1; | |
575 | int cnt; | |
d19320fd | 576 | int reading_remotely = filesfrom_host != NULL; |
56014c8c WD |
577 | int nulls = eol_nulls || reading_remotely; |
578 | ||
579 | start: | |
580 | s = fname; | |
581 | while (1) { | |
582 | cnt = read(fd, &ch, 1); | |
583 | if (cnt < 0 && (errno == EWOULDBLOCK | |
584 | || errno == EINTR || errno == EAGAIN)) { | |
585 | struct timeval tv; | |
586 | fd_set fds; | |
587 | FD_ZERO(&fds); | |
588 | FD_SET(fd, &fds); | |
e626b29e | 589 | tv.tv_sec = select_timeout; |
56014c8c WD |
590 | tv.tv_usec = 0; |
591 | if (!select(fd+1, &fds, NULL, NULL, &tv)) | |
592 | check_timeout(); | |
593 | continue; | |
594 | } | |
595 | if (cnt != 1) | |
596 | break; | |
597 | if (nulls? !ch : (ch == '\r' || ch == '\n')) { | |
598 | /* Skip empty lines if reading locally. */ | |
599 | if (!reading_remotely && s == fname) | |
600 | continue; | |
601 | break; | |
602 | } | |
603 | if (s < eob) | |
604 | *s++ = ch; | |
605 | } | |
606 | *s = '\0'; | |
7a55d06e | 607 | |
6b45fcf1 WD |
608 | /* Dump comments. */ |
609 | if (*fname == '#' || *fname == ';') | |
56014c8c WD |
610 | goto start; |
611 | ||
612 | return s - fname; | |
613 | } | |
7a55d06e MP |
614 | |
615 | ||
1f75bb10 WD |
616 | static char *iobuf_out; |
617 | static int iobuf_out_cnt; | |
618 | ||
619 | void io_start_buffering_out(void) | |
620 | { | |
621 | if (iobuf_out) | |
622 | return; | |
623 | if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) | |
624 | out_of_memory("io_start_buffering_out"); | |
625 | iobuf_out_cnt = 0; | |
626 | } | |
627 | ||
628 | ||
629 | static char *iobuf_in; | |
630 | static size_t iobuf_in_siz; | |
631 | ||
632 | void io_start_buffering_in(void) | |
633 | { | |
634 | if (iobuf_in) | |
635 | return; | |
636 | iobuf_in_siz = 2 * IO_BUFFER_SIZE; | |
637 | if (!(iobuf_in = new_array(char, iobuf_in_siz))) | |
638 | out_of_memory("io_start_buffering_in"); | |
639 | } | |
640 | ||
641 | ||
642 | void io_end_buffering(void) | |
643 | { | |
644 | io_flush(NORMAL_FLUSH); | |
645 | if (!io_multiplexing_out) { | |
646 | free(iobuf_out); | |
647 | iobuf_out = NULL; | |
648 | } | |
649 | } | |
650 | ||
651 | ||
9e2409ab WD |
652 | void maybe_send_keepalive(int allowed_lull, int ndx) |
653 | { | |
654 | if (time(NULL) - last_io >= allowed_lull) { | |
655 | if (!iobuf_out || !iobuf_out_cnt) { | |
3221f451 WD |
656 | if (protocol_version < 29) |
657 | return; /* there's nothing we can do */ | |
9e2409ab WD |
658 | write_int(sock_f_out, ndx); |
659 | write_shortint(sock_f_out, ITEM_IS_NEW); | |
660 | } | |
661 | if (iobuf_out) | |
662 | io_flush(NORMAL_FLUSH); | |
663 | } | |
664 | } | |
665 | ||
666 | ||
880da007 MP |
667 | /** |
668 | * Continue trying to read len bytes - don't return until len has been | |
669 | * read. | |
670 | **/ | |
3151cbae | 671 | static void read_loop(int fd, char *buf, size_t len) |
4c36ddbe AT |
672 | { |
673 | while (len) { | |
674 | int n = read_timeout(fd, buf, len); | |
675 | ||
676 | buf += n; | |
677 | len -= n; | |
8d9dc9f9 AT |
678 | } |
679 | } | |
680 | ||
7a55d06e MP |
681 | |
682 | /** | |
683 | * Read from the file descriptor handling multiplexing - return number | |
684 | * of bytes read. | |
d62bcc17 WD |
685 | * |
686 | * Never returns <= 0. | |
7a55d06e | 687 | */ |
c399d22a | 688 | static int readfd_unbuffered(int fd, char *buf, size_t len) |
8d9dc9f9 | 689 | { |
6fe25398 | 690 | static size_t remaining; |
1f75bb10 | 691 | static size_t iobuf_in_ndx; |
909ce14f | 692 | int tag, ret = 0; |
0d67e00a | 693 | char line[MAXPATHLEN+1]; |
8d9dc9f9 | 694 | |
1f75bb10 | 695 | if (!iobuf_in || fd != sock_f_in) |
4c36ddbe | 696 | return read_timeout(fd, buf, len); |
8d9dc9f9 | 697 | |
76c21947 | 698 | if (!io_multiplexing_in && remaining == 0) { |
1f75bb10 WD |
699 | remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); |
700 | iobuf_in_ndx = 0; | |
76c21947 WD |
701 | } |
702 | ||
8d9dc9f9 AT |
703 | while (ret == 0) { |
704 | if (remaining) { | |
705 | len = MIN(len, remaining); | |
1f75bb10 WD |
706 | memcpy(buf, iobuf_in + iobuf_in_ndx, len); |
707 | iobuf_in_ndx += len; | |
8d9dc9f9 AT |
708 | remaining -= len; |
709 | ret = len; | |
76c21947 | 710 | break; |
8d9dc9f9 AT |
711 | } |
712 | ||
909ce14f | 713 | read_loop(fd, line, 4); |
ff41a59f | 714 | tag = IVAL(line, 0); |
679e7657 | 715 | |
8d9dc9f9 | 716 | remaining = tag & 0xFFFFFF; |
d17e1dd2 | 717 | tag = (tag >> 24) - MPLEX_BASE; |
8d9dc9f9 | 718 | |
d17e1dd2 WD |
719 | switch (tag) { |
720 | case MSG_DATA: | |
1f75bb10 WD |
721 | if (remaining > iobuf_in_siz) { |
722 | if (!(iobuf_in = realloc_array(iobuf_in, char, | |
723 | remaining))) | |
c399d22a | 724 | out_of_memory("readfd_unbuffered"); |
1f75bb10 | 725 | iobuf_in_siz = remaining; |
76c21947 | 726 | } |
1f75bb10 WD |
727 | read_loop(fd, iobuf_in, remaining); |
728 | iobuf_in_ndx = 0; | |
d17e1dd2 | 729 | break; |
0d67e00a WD |
730 | case MSG_DELETED: |
731 | if (remaining >= sizeof line) { | |
732 | rprintf(FERROR, "invalid multi-message %d:%ld\n", | |
733 | tag, (long)remaining); | |
734 | exit_cleanup(RERR_STREAMIO); | |
735 | } | |
736 | read_loop(fd, line, remaining); | |
737 | line[remaining] = '\0'; | |
738 | /* A directory name was sent with the trailing null */ | |
739 | if (remaining > 0 && !line[remaining-1]) | |
740 | log_delete(line, S_IFDIR); | |
741 | else | |
742 | log_delete(line, S_IFREG); | |
743 | remaining = 0; | |
744 | break; | |
9981c27e WD |
745 | case MSG_SUCCESS: |
746 | if (remaining != 4) { | |
747 | rprintf(FERROR, "invalid multi-message %d:%ld\n", | |
748 | tag, (long)remaining); | |
749 | exit_cleanup(RERR_STREAMIO); | |
750 | } | |
751 | read_loop(fd, line, remaining); | |
752 | successful_send(IVAL(line, 0)); | |
753 | remaining = 0; | |
754 | break; | |
d17e1dd2 WD |
755 | case MSG_INFO: |
756 | case MSG_ERROR: | |
757 | if (remaining >= sizeof line) { | |
bd9fca47 WD |
758 | rprintf(FERROR, |
759 | "[%s] multiplexing overflow %d:%ld\n\n", | |
760 | who_am_i(), tag, (long)remaining); | |
d17e1dd2 WD |
761 | exit_cleanup(RERR_STREAMIO); |
762 | } | |
763 | read_loop(fd, line, remaining); | |
764 | rwrite((enum logcode)tag, line, remaining); | |
765 | remaining = 0; | |
766 | break; | |
767 | default: | |
bd9fca47 WD |
768 | rprintf(FERROR, "[%s] unexpected tag %d\n", |
769 | who_am_i(), tag); | |
65417579 | 770 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 771 | } |
8d9dc9f9 AT |
772 | } |
773 | ||
76c21947 | 774 | if (remaining == 0) |
d17e1dd2 | 775 | io_flush(NORMAL_FLUSH); |
76c21947 | 776 | |
8d9dc9f9 AT |
777 | return ret; |
778 | } | |
779 | ||
780 | ||
909ce14f | 781 | |
880da007 MP |
782 | /** |
783 | * Do a buffered read from @p fd. Don't return until all @p n bytes | |
784 | * have been read. If all @p n can't be read then exit with an | |
785 | * error. | |
786 | **/ | |
3151cbae | 787 | static void readfd(int fd, char *buffer, size_t N) |
720b47f2 | 788 | { |
6ba9279f | 789 | int ret; |
d62bcc17 | 790 | size_t total = 0; |
3151cbae | 791 | |
6ba9279f | 792 | while (total < N) { |
c399d22a | 793 | ret = readfd_unbuffered(fd, buffer + total, N-total); |
6ba9279f | 794 | total += ret; |
7f28dbee | 795 | } |
1b7c47cb | 796 | |
b9f592fb WD |
797 | if (fd == write_batch_monitor_in) { |
798 | if ((size_t)write(batch_fd, buffer, total) != total) | |
799 | exit_cleanup(RERR_FILEIO); | |
800 | } | |
1f75bb10 WD |
801 | |
802 | if (fd == sock_f_in) | |
803 | stats.total_read += total; | |
720b47f2 AT |
804 | } |
805 | ||
806 | ||
0d67e00a | 807 | int read_shortint(int f) |
9361f839 WD |
808 | { |
809 | uchar b[2]; | |
810 | readfd(f, (char *)b, 2); | |
811 | return (b[1] << 8) + b[0]; | |
812 | } | |
813 | ||
814 | ||
b7922338 | 815 | int32 read_int(int f) |
720b47f2 | 816 | { |
4c36ddbe | 817 | char b[4]; |
d730b113 AT |
818 | int32 ret; |
819 | ||
4c36ddbe | 820 | readfd(f,b,4); |
d730b113 | 821 | ret = IVAL(b,0); |
f89b9368 WD |
822 | if (ret == (int32)0xffffffff) |
823 | return -1; | |
d730b113 | 824 | return ret; |
720b47f2 AT |
825 | } |
826 | ||
71c46176 | 827 | int64 read_longint(int f) |
3a6a366f | 828 | { |
71c46176 | 829 | int64 ret; |
3a6a366f AT |
830 | char b[8]; |
831 | ret = read_int(f); | |
71c46176 | 832 | |
f89b9368 | 833 | if ((int32)ret != (int32)0xffffffff) |
8de330a3 | 834 | return ret; |
71c46176 | 835 | |
031fa9ad WD |
836 | #if SIZEOF_INT64 < 8 |
837 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
838 | exit_cleanup(RERR_UNSUPPORTED); | |
839 | #else | |
91c4da3f S |
840 | readfd(f,b,8); |
841 | ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); | |
031fa9ad | 842 | #endif |
71c46176 | 843 | |
3a6a366f AT |
844 | return ret; |
845 | } | |
846 | ||
9dd891bb | 847 | void read_buf(int f,char *buf,size_t len) |
720b47f2 | 848 | { |
4c36ddbe | 849 | readfd(f,buf,len); |
720b47f2 AT |
850 | } |
851 | ||
9dd891bb | 852 | void read_sbuf(int f,char *buf,size_t len) |
575f2fca | 853 | { |
93095cbe | 854 | readfd(f, buf, len); |
af436313 | 855 | buf[len] = '\0'; |
575f2fca AT |
856 | } |
857 | ||
9361f839 | 858 | uchar read_byte(int f) |
182dca5c | 859 | { |
9361f839 | 860 | uchar c; |
93095cbe | 861 | readfd(f, (char *)&c, 1); |
4c36ddbe | 862 | return c; |
182dca5c | 863 | } |
720b47f2 | 864 | |
46e99b09 WD |
865 | int read_vstring(int f, char *buf, int bufsize) |
866 | { | |
867 | int len = read_byte(f); | |
868 | ||
869 | if (len & 0x80) | |
870 | len = (len & ~0x80) * 0x100 + read_byte(f); | |
871 | ||
872 | if (len >= bufsize) { | |
873 | rprintf(FERROR, "over-long vstring received (%d > %d)\n", | |
874 | len, bufsize - 1); | |
875 | exit_cleanup(RERR_PROTOCOL); | |
876 | } | |
877 | ||
878 | if (len) | |
879 | readfd(f, buf, len); | |
880 | buf[len] = '\0'; | |
881 | return len; | |
882 | } | |
883 | ||
188fed95 WD |
884 | /* Populate a sum_struct with values from the socket. This is |
885 | * called by both the sender and the receiver. */ | |
886 | void read_sum_head(int f, struct sum_struct *sum) | |
887 | { | |
888 | sum->count = read_int(f); | |
889 | sum->blength = read_int(f); | |
890 | if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { | |
67dde161 WD |
891 | rprintf(FERROR, "[%s] Invalid block length %ld\n", |
892 | who_am_i(), (long)sum->blength); | |
188fed95 WD |
893 | exit_cleanup(RERR_PROTOCOL); |
894 | } | |
895 | sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); | |
896 | if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) { | |
67dde161 WD |
897 | rprintf(FERROR, "[%s] Invalid checksum length %d\n", |
898 | who_am_i(), sum->s2length); | |
188fed95 WD |
899 | exit_cleanup(RERR_PROTOCOL); |
900 | } | |
901 | sum->remainder = read_int(f); | |
902 | if (sum->remainder < 0 || sum->remainder > sum->blength) { | |
67dde161 WD |
903 | rprintf(FERROR, "[%s] Invalid remainder length %ld\n", |
904 | who_am_i(), (long)sum->remainder); | |
188fed95 WD |
905 | exit_cleanup(RERR_PROTOCOL); |
906 | } | |
907 | } | |
908 | ||
c207d7ec WD |
909 | /* Send the values from a sum_struct over the socket. Set sum to |
910 | * NULL if there are no checksums to send. This is called by both | |
911 | * the generator and the sender. */ | |
912 | void write_sum_head(int f, struct sum_struct *sum) | |
913 | { | |
914 | static struct sum_struct null_sum; | |
915 | ||
916 | if (sum == NULL) | |
917 | sum = &null_sum; | |
918 | ||
919 | write_int(f, sum->count); | |
920 | write_int(f, sum->blength); | |
921 | if (protocol_version >= 27) | |
922 | write_int(f, sum->s2length); | |
923 | write_int(f, sum->remainder); | |
924 | } | |
925 | ||
880da007 | 926 | |
08571358 MP |
927 | /** |
928 | * Sleep after writing to limit I/O bandwidth usage. | |
929 | * | |
930 | * @todo Rather than sleeping after each write, it might be better to | |
931 | * use some kind of averaging. The current algorithm seems to always | |
932 | * use a bit less bandwidth than specified, because it doesn't make up | |
933 | * for slow periods. But arguably this is a feature. In addition, we | |
934 | * ought to take the time used to write the data into account. | |
71e58630 WD |
935 | * |
936 | * During some phases of big transfers (file FOO is uptodate) this is | |
937 | * called with a small bytes_written every time. As the kernel has to | |
938 | * round small waits up to guarantee that we actually wait at least the | |
939 | * requested number of microseconds, this can become grossly inaccurate. | |
940 | * We therefore keep track of the bytes we've written over time and only | |
941 | * sleep when the accumulated delay is at least 1 tenth of a second. | |
08571358 MP |
942 | **/ |
943 | static void sleep_for_bwlimit(int bytes_written) | |
944 | { | |
71e58630 WD |
945 | static struct timeval prior_tv; |
946 | static long total_written = 0; | |
947 | struct timeval tv, start_tv; | |
948 | long elapsed_usec, sleep_usec; | |
949 | ||
950 | #define ONE_SEC 1000000L /* # of microseconds in a second */ | |
08571358 MP |
951 | |
952 | if (!bwlimit) | |
953 | return; | |
e681e820 | 954 | |
71e58630 WD |
955 | total_written += bytes_written; |
956 | ||
957 | gettimeofday(&start_tv, NULL); | |
958 | if (prior_tv.tv_sec) { | |
959 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC | |
960 | + (start_tv.tv_usec - prior_tv.tv_usec); | |
961 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); | |
962 | if (total_written < 0) | |
963 | total_written = 0; | |
964 | } | |
3151cbae | 965 | |
71e58630 WD |
966 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
967 | if (sleep_usec < ONE_SEC / 10) { | |
968 | prior_tv = start_tv; | |
969 | return; | |
970 | } | |
08571358 | 971 | |
71e58630 WD |
972 | tv.tv_sec = sleep_usec / ONE_SEC; |
973 | tv.tv_usec = sleep_usec % ONE_SEC; | |
98b332ed | 974 | select(0, NULL, NULL, NULL, &tv); |
71e58630 WD |
975 | |
976 | gettimeofday(&prior_tv, NULL); | |
977 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC | |
978 | + (prior_tv.tv_usec - start_tv.tv_usec); | |
979 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); | |
08571358 MP |
980 | } |
981 | ||
982 | ||
1f75bb10 | 983 | /* Write len bytes to the file descriptor fd, looping as necessary to get |
af436313 WD |
984 | * the job done and also (in certain circumstnces) reading any data on |
985 | * msg_fd_in to avoid deadlock. | |
880da007 MP |
986 | * |
987 | * This function underlies the multiplexing system. The body of the | |
1f75bb10 | 988 | * application never calls this function directly. */ |
9dd891bb | 989 | static void writefd_unbuffered(int fd,char *buf,size_t len) |
720b47f2 | 990 | { |
1ea087a7 | 991 | size_t n, total = 0; |
8d9dc9f9 | 992 | fd_set w_fds, r_fds; |
1ea087a7 | 993 | int maxfd, count, ret; |
8d9dc9f9 | 994 | struct timeval tv; |
720b47f2 | 995 | |
e44f9a12 AT |
996 | no_flush++; |
997 | ||
4c36ddbe | 998 | while (total < len) { |
8d9dc9f9 | 999 | FD_ZERO(&w_fds); |
8d9dc9f9 | 1000 | FD_SET(fd,&w_fds); |
1ea087a7 | 1001 | maxfd = fd; |
4c36ddbe | 1002 | |
af436313 | 1003 | if (msg_fd_in >= 0 && len-total >= contiguous_write_len) { |
56014c8c | 1004 | FD_ZERO(&r_fds); |
d17e1dd2 | 1005 | FD_SET(msg_fd_in,&r_fds); |
1ea087a7 WD |
1006 | if (msg_fd_in > maxfd) |
1007 | maxfd = msg_fd_in; | |
8d9dc9f9 | 1008 | } |
41cfde6b WD |
1009 | if (fd != sock_f_out && iobuf_out_cnt && no_flush == 1) { |
1010 | FD_SET(sock_f_out, &w_fds); | |
1011 | if (sock_f_out > maxfd) | |
1012 | maxfd = sock_f_out; | |
1013 | } | |
8d9dc9f9 | 1014 | |
e626b29e | 1015 | tv.tv_sec = select_timeout; |
8d9dc9f9 | 1016 | tv.tv_usec = 0; |
4c36ddbe | 1017 | |
554e0a8d | 1018 | errno = 0; |
1ea087a7 | 1019 | count = select(maxfd + 1, msg_fd_in >= 0 ? &r_fds : NULL, |
d17e1dd2 | 1020 | &w_fds, NULL, &tv); |
4c36ddbe AT |
1021 | |
1022 | if (count <= 0) { | |
1ea087a7 | 1023 | if (count < 0 && errno == EBADF) |
554e0a8d | 1024 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 1025 | check_timeout(); |
8d9dc9f9 AT |
1026 | continue; |
1027 | } | |
4c36ddbe | 1028 | |
d17e1dd2 WD |
1029 | if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds)) |
1030 | read_msg_fd(); | |
554e0a8d | 1031 | |
41cfde6b WD |
1032 | if (!FD_ISSET(fd, &w_fds)) { |
1033 | if (fd != sock_f_out && iobuf_out_cnt) { | |
1034 | no_flush--; | |
1035 | io_flush(NORMAL_FLUSH); | |
1036 | no_flush++; | |
1037 | } | |
1ea087a7 | 1038 | continue; |
41cfde6b | 1039 | } |
4c36ddbe | 1040 | |
1ea087a7 WD |
1041 | n = len - total; |
1042 | if (bwlimit && n > bwlimit_writemax) | |
1043 | n = bwlimit_writemax; | |
1044 | ret = write(fd, buf + total, n); | |
1045 | ||
1046 | if (ret <= 0) { | |
3309507d WD |
1047 | if (ret < 0) { |
1048 | if (errno == EINTR) | |
1049 | continue; | |
1050 | if (errno == EWOULDBLOCK || errno == EAGAIN) { | |
1051 | msleep(1); | |
1052 | continue; | |
1053 | } | |
f0359dd0 AT |
1054 | } |
1055 | ||
1ea087a7 | 1056 | /* Don't try to write errors back across the stream. */ |
1f75bb10 | 1057 | if (fd == sock_f_out) |
7f459268 | 1058 | close_multiplexing_out(); |
1ea087a7 | 1059 | rsyserr(FERROR, errno, |
dca68b0a WD |
1060 | "writefd_unbuffered failed to write %ld bytes: phase \"%s\" [%s]", |
1061 | (long)len, io_write_phase, who_am_i()); | |
d1b31da7 WD |
1062 | /* If the other side is sending us error messages, try |
1063 | * to grab any messages they sent before they died. */ | |
7f459268 | 1064 | while (fd == sock_f_out && io_multiplexing_in) { |
ef0c03ff | 1065 | io_timeout = select_timeout = 30; |
9e2409ab | 1066 | ignore_timeout = 0; |
d1b31da7 WD |
1067 | readfd_unbuffered(sock_f_in, io_filesfrom_buf, |
1068 | sizeof io_filesfrom_buf); | |
1069 | } | |
1ea087a7 WD |
1070 | exit_cleanup(RERR_STREAMIO); |
1071 | } | |
4c36ddbe | 1072 | |
1ea087a7 | 1073 | total += ret; |
a800434a | 1074 | |
1f75bb10 WD |
1075 | if (fd == sock_f_out) { |
1076 | if (io_timeout) | |
1077 | last_io = time(NULL); | |
1078 | sleep_for_bwlimit(ret); | |
1079 | } | |
4c36ddbe | 1080 | } |
e44f9a12 AT |
1081 | |
1082 | no_flush--; | |
720b47f2 AT |
1083 | } |
1084 | ||
8d9dc9f9 | 1085 | |
880da007 MP |
1086 | /** |
1087 | * Write an message to a multiplexed stream. If this fails then rsync | |
1088 | * exits. | |
1089 | **/ | |
1f75bb10 | 1090 | static void mplex_write(enum msgcode code, char *buf, size_t len) |
ff41a59f AT |
1091 | { |
1092 | char buffer[4096]; | |
06ce139f | 1093 | size_t n = len; |
8d9dc9f9 | 1094 | |
ff41a59f AT |
1095 | SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); |
1096 | ||
af436313 WD |
1097 | /* When the generator reads messages from the msg_fd_in pipe, it can |
1098 | * cause output to occur down the socket. Setting contiguous_write_len | |
1099 | * prevents the reading of msg_fd_in once we actually start to write | |
1100 | * this sequence of data (though we might read it before the start). */ | |
1101 | if (am_generator && msg_fd_in >= 0) | |
1102 | contiguous_write_len = len + 4; | |
1103 | ||
c399d22a | 1104 | if (n > sizeof buffer - 4) |
3151cbae | 1105 | n = sizeof buffer - 4; |
ff41a59f AT |
1106 | |
1107 | memcpy(&buffer[4], buf, n); | |
1f75bb10 | 1108 | writefd_unbuffered(sock_f_out, buffer, n+4); |
ff41a59f AT |
1109 | |
1110 | len -= n; | |
1111 | buf += n; | |
1112 | ||
1ea087a7 | 1113 | if (len) |
1f75bb10 | 1114 | writefd_unbuffered(sock_f_out, buf, len); |
af436313 WD |
1115 | |
1116 | if (am_generator && msg_fd_in >= 0) | |
1117 | contiguous_write_len = 0; | |
d6dead6b AT |
1118 | } |
1119 | ||
ff41a59f | 1120 | |
d17e1dd2 | 1121 | void io_flush(int flush_it_all) |
d6dead6b | 1122 | { |
d17e1dd2 | 1123 | msg_list_push(flush_it_all); |
90ba34e2 | 1124 | |
1f75bb10 | 1125 | if (!iobuf_out_cnt || no_flush) |
d17e1dd2 | 1126 | return; |
8d9dc9f9 | 1127 | |
d17e1dd2 | 1128 | if (io_multiplexing_out) |
1f75bb10 | 1129 | mplex_write(MSG_DATA, iobuf_out, iobuf_out_cnt); |
d17e1dd2 | 1130 | else |
1f75bb10 WD |
1131 | writefd_unbuffered(sock_f_out, iobuf_out, iobuf_out_cnt); |
1132 | iobuf_out_cnt = 0; | |
8d9dc9f9 AT |
1133 | } |
1134 | ||
0ba48136 | 1135 | |
9dd891bb | 1136 | static void writefd(int fd,char *buf,size_t len) |
d6dead6b | 1137 | { |
4033b80b WD |
1138 | if (fd == msg_fd_out) { |
1139 | rprintf(FERROR, "Internal error: wrong write used in receiver.\n"); | |
1140 | exit_cleanup(RERR_PROTOCOL); | |
1141 | } | |
90ba34e2 | 1142 | |
1f75bb10 WD |
1143 | if (fd == sock_f_out) |
1144 | stats.total_written += len; | |
1145 | ||
b9f592fb WD |
1146 | if (fd == write_batch_monitor_out) { |
1147 | if ((size_t)write(batch_fd, buf, len) != len) | |
1148 | exit_cleanup(RERR_FILEIO); | |
1149 | } | |
1150 | ||
1f75bb10 | 1151 | if (!iobuf_out || fd != sock_f_out) { |
4c36ddbe AT |
1152 | writefd_unbuffered(fd, buf, len); |
1153 | return; | |
1154 | } | |
d6dead6b AT |
1155 | |
1156 | while (len) { | |
1f75bb10 | 1157 | int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt); |
d6dead6b | 1158 | if (n > 0) { |
1f75bb10 | 1159 | memcpy(iobuf_out+iobuf_out_cnt, buf, n); |
d6dead6b AT |
1160 | buf += n; |
1161 | len -= n; | |
1f75bb10 | 1162 | iobuf_out_cnt += n; |
d6dead6b | 1163 | } |
3151cbae | 1164 | |
1f75bb10 | 1165 | if (iobuf_out_cnt == IO_BUFFER_SIZE) |
d17e1dd2 | 1166 | io_flush(NORMAL_FLUSH); |
d6dead6b | 1167 | } |
d6dead6b | 1168 | } |
720b47f2 AT |
1169 | |
1170 | ||
0d67e00a | 1171 | void write_shortint(int f, int x) |
9361f839 WD |
1172 | { |
1173 | uchar b[2]; | |
1174 | b[0] = x; | |
1175 | b[1] = x >> 8; | |
1176 | writefd(f, (char *)b, 2); | |
1177 | } | |
1178 | ||
1179 | ||
b7922338 | 1180 | void write_int(int f,int32 x) |
720b47f2 | 1181 | { |
8d9dc9f9 AT |
1182 | char b[4]; |
1183 | SIVAL(b,0,x); | |
4c36ddbe | 1184 | writefd(f,b,4); |
720b47f2 AT |
1185 | } |
1186 | ||
7a24c346 | 1187 | |
805edf9d MP |
1188 | void write_int_named(int f, int32 x, const char *phase) |
1189 | { | |
1190 | io_write_phase = phase; | |
1191 | write_int(f, x); | |
1192 | io_write_phase = phase_unknown; | |
1193 | } | |
1194 | ||
1195 | ||
7a24c346 MP |
1196 | /* |
1197 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any | |
1198 | * 64-bit types on this platform. | |
1199 | */ | |
71c46176 | 1200 | void write_longint(int f, int64 x) |
3a6a366f | 1201 | { |
3a6a366f | 1202 | char b[8]; |
3a6a366f | 1203 | |
91c4da3f | 1204 | if (x <= 0x7FFFFFFF) { |
3a6a366f AT |
1205 | write_int(f, (int)x); |
1206 | return; | |
1207 | } | |
1208 | ||
031fa9ad WD |
1209 | #if SIZEOF_INT64 < 8 |
1210 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1211 | exit_cleanup(RERR_UNSUPPORTED); | |
1212 | #else | |
8de330a3 | 1213 | write_int(f, (int32)0xFFFFFFFF); |
3a6a366f AT |
1214 | SIVAL(b,0,(x&0xFFFFFFFF)); |
1215 | SIVAL(b,4,((x>>32)&0xFFFFFFFF)); | |
1216 | ||
4c36ddbe | 1217 | writefd(f,b,8); |
031fa9ad | 1218 | #endif |
3a6a366f AT |
1219 | } |
1220 | ||
9dd891bb | 1221 | void write_buf(int f,char *buf,size_t len) |
720b47f2 | 1222 | { |
4c36ddbe | 1223 | writefd(f,buf,len); |
720b47f2 AT |
1224 | } |
1225 | ||
880da007 | 1226 | /** Write a string to the connection */ |
cf338ab1 | 1227 | void write_sbuf(int f, char *buf) |
f0fca04e | 1228 | { |
93095cbe | 1229 | writefd(f, buf, strlen(buf)); |
f0fca04e AT |
1230 | } |
1231 | ||
9361f839 | 1232 | void write_byte(int f, uchar c) |
182dca5c | 1233 | { |
93095cbe | 1234 | writefd(f, (char *)&c, 1); |
182dca5c AT |
1235 | } |
1236 | ||
46e99b09 WD |
1237 | void write_vstring(int f, char *str, int len) |
1238 | { | |
1239 | uchar lenbuf[3], *lb = lenbuf; | |
1240 | ||
1241 | if (len > 0x7F) { | |
1242 | if (len > 0x7FFF) { | |
1243 | rprintf(FERROR, | |
1244 | "attempting to send over-long vstring (%d > %d)\n", | |
1245 | len, 0x7FFF); | |
1246 | exit_cleanup(RERR_PROTOCOL); | |
1247 | } | |
1248 | *lb++ = len / 0x100 + 0x80; | |
1249 | } | |
1250 | *lb = len; | |
1251 | ||
1252 | writefd(f, (char*)lenbuf, lb - lenbuf + 1); | |
1253 | if (len) | |
1254 | writefd(f, str, len); | |
1255 | } | |
1256 | ||
7a55d06e | 1257 | |
914cc65c | 1258 | /** |
6ed6d7f5 WD |
1259 | * Read a line of up to @p maxlen characters into @p buf (not counting |
1260 | * the trailing null). Strips the (required) trailing newline and all | |
1261 | * carriage returns. | |
914cc65c | 1262 | * |
6ed6d7f5 | 1263 | * @return 1 for success; 0 for I/O error or truncation. |
914cc65c | 1264 | **/ |
9dd891bb | 1265 | int read_line(int f, char *buf, size_t maxlen) |
f0fca04e AT |
1266 | { |
1267 | while (maxlen) { | |
528bfcd7 | 1268 | buf[0] = 0; |
f0fca04e | 1269 | read_buf(f, buf, 1); |
914cc65c MP |
1270 | if (buf[0] == 0) |
1271 | return 0; | |
6ed6d7f5 | 1272 | if (buf[0] == '\n') |
f0fca04e | 1273 | break; |
f0fca04e AT |
1274 | if (buf[0] != '\r') { |
1275 | buf++; | |
1276 | maxlen--; | |
1277 | } | |
1278 | } | |
6ed6d7f5 WD |
1279 | *buf = '\0'; |
1280 | return maxlen > 0; | |
f0fca04e AT |
1281 | } |
1282 | ||
1283 | ||
1284 | void io_printf(int fd, const char *format, ...) | |
1285 | { | |
d62bcc17 | 1286 | va_list ap; |
f0fca04e AT |
1287 | char buf[1024]; |
1288 | int len; | |
3151cbae | 1289 | |
f0fca04e | 1290 | va_start(ap, format); |
3151cbae | 1291 | len = vsnprintf(buf, sizeof buf, format, ap); |
f0fca04e AT |
1292 | va_end(ap); |
1293 | ||
f89b9368 WD |
1294 | if (len < 0) |
1295 | exit_cleanup(RERR_STREAMIO); | |
f0fca04e AT |
1296 | |
1297 | write_sbuf(fd, buf); | |
1298 | } | |
8d9dc9f9 AT |
1299 | |
1300 | ||
d17e1dd2 | 1301 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1302 | void io_start_multiplex_out(void) |
8d9dc9f9 | 1303 | { |
d17e1dd2 | 1304 | io_flush(NORMAL_FLUSH); |
1f75bb10 | 1305 | io_start_buffering_out(); |
8d9dc9f9 AT |
1306 | io_multiplexing_out = 1; |
1307 | } | |
1308 | ||
d17e1dd2 | 1309 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1310 | void io_start_multiplex_in(void) |
8d9dc9f9 | 1311 | { |
d17e1dd2 | 1312 | io_flush(NORMAL_FLUSH); |
1f75bb10 | 1313 | io_start_buffering_in(); |
8d9dc9f9 AT |
1314 | io_multiplexing_in = 1; |
1315 | } | |
1316 | ||
d17e1dd2 WD |
1317 | /** Write an message to the multiplexed data stream. */ |
1318 | int io_multiplex_write(enum msgcode code, char *buf, size_t len) | |
8d9dc9f9 | 1319 | { |
f89b9368 WD |
1320 | if (!io_multiplexing_out) |
1321 | return 0; | |
8d9dc9f9 | 1322 | |
d17e1dd2 | 1323 | io_flush(NORMAL_FLUSH); |
1b7c47cb | 1324 | stats.total_written += (len+4); |
1f75bb10 | 1325 | mplex_write(code, buf, len); |
8d9dc9f9 AT |
1326 | return 1; |
1327 | } | |
1328 | ||
7f459268 WD |
1329 | void close_multiplexing_in(void) |
1330 | { | |
1331 | io_multiplexing_in = 0; | |
1332 | } | |
1333 | ||
d17e1dd2 | 1334 | /** Stop output multiplexing. */ |
7f459268 | 1335 | void close_multiplexing_out(void) |
554e0a8d AT |
1336 | { |
1337 | io_multiplexing_out = 0; | |
1338 | } | |
1339 | ||
b9f592fb WD |
1340 | void start_write_batch(int fd) |
1341 | { | |
741d6544 WD |
1342 | write_stream_flags(batch_fd); |
1343 | ||
b9f592fb WD |
1344 | /* Some communication has already taken place, but we don't |
1345 | * enable batch writing until here so that we can write a | |
1346 | * canonical record of the communication even though the | |
1347 | * actual communication so far depends on whether a daemon | |
1348 | * is involved. */ | |
1349 | write_int(batch_fd, protocol_version); | |
1350 | write_int(batch_fd, checksum_seed); | |
b9f592fb WD |
1351 | |
1352 | if (am_sender) | |
1353 | write_batch_monitor_out = fd; | |
1354 | else | |
1355 | write_batch_monitor_in = fd; | |
1356 | } | |
1357 | ||
1358 | void stop_write_batch(void) | |
1359 | { | |
1360 | write_batch_monitor_out = -1; | |
1361 | write_batch_monitor_in = -1; | |
1362 | } |