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; | |
e626b29e | 54 | extern char *remote_filesfrom_file; |
a800434a | 55 | extern struct stats stats; |
720b47f2 | 56 | |
a86179f4 | 57 | const char phase_unknown[] = "unknown"; |
e626b29e | 58 | int select_timeout = SELECT_TIMEOUT; |
b9f592fb | 59 | int batch_fd = -1; |
b0ad5429 | 60 | int batch_gen_fd = -1; |
805edf9d | 61 | |
98b332ed MP |
62 | /** |
63 | * The connection might be dropped at some point; perhaps because the | |
64 | * remote instance crashed. Just giving the offset on the stream is | |
65 | * not very helpful. So instead we try to make io_phase_name point to | |
66 | * something useful. | |
eca2adb4 | 67 | * |
6ed6d7f5 | 68 | * For buffered/multiplexed I/O these names will be somewhat |
805edf9d | 69 | * approximate; perhaps for ease of support we would rather make the |
6ed6d7f5 | 70 | * buffer always flush when a single application-level I/O finishes. |
805edf9d | 71 | * |
eca2adb4 MP |
72 | * @todo Perhaps we want some simple stack functionality, but there's |
73 | * no need to overdo it. | |
98b332ed | 74 | **/ |
805edf9d MP |
75 | const char *io_write_phase = phase_unknown; |
76 | const char *io_read_phase = phase_unknown; | |
98b332ed | 77 | |
7a55d06e MP |
78 | /** Ignore EOF errors while reading a module listing if the remote |
79 | version is 24 or less. */ | |
80 | int kludge_around_eof = False; | |
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; | |
720b47f2 | 101 | |
9dd891bb | 102 | static void read_loop(int fd, char *buf, size_t len); |
ff41a59f | 103 | |
d17e1dd2 WD |
104 | struct redo_list { |
105 | struct redo_list *next; | |
106 | int num; | |
107 | }; | |
108 | ||
109 | static struct redo_list *redo_list_head; | |
110 | static struct redo_list *redo_list_tail; | |
111 | ||
112 | struct msg_list { | |
113 | struct msg_list *next; | |
114 | char *buf; | |
115 | int len; | |
116 | }; | |
117 | ||
118 | static struct msg_list *msg_list_head; | |
119 | static struct msg_list *msg_list_tail; | |
120 | ||
121 | static void redo_list_add(int num) | |
122 | { | |
123 | struct redo_list *rl; | |
124 | ||
125 | if (!(rl = new(struct redo_list))) | |
126 | exit_cleanup(RERR_MALLOC); | |
127 | rl->next = NULL; | |
128 | rl->num = num; | |
129 | if (redo_list_tail) | |
130 | redo_list_tail->next = rl; | |
131 | else | |
132 | redo_list_head = rl; | |
133 | redo_list_tail = rl; | |
134 | } | |
135 | ||
8d9dc9f9 AT |
136 | static void check_timeout(void) |
137 | { | |
138 | time_t t; | |
90ba34e2 | 139 | |
d17e1dd2 WD |
140 | if (!io_timeout) |
141 | return; | |
8d9dc9f9 AT |
142 | |
143 | if (!last_io) { | |
144 | last_io = time(NULL); | |
145 | return; | |
146 | } | |
147 | ||
148 | t = time(NULL); | |
149 | ||
1f75bb10 | 150 | if (t - last_io >= io_timeout) { |
0adb99b9 | 151 | if (!am_server && !am_daemon) { |
d62bcc17 | 152 | rprintf(FERROR, "io timeout after %d seconds - exiting\n", |
0adb99b9 AT |
153 | (int)(t-last_io)); |
154 | } | |
65417579 | 155 | exit_cleanup(RERR_TIMEOUT); |
8d9dc9f9 AT |
156 | } |
157 | } | |
158 | ||
1f75bb10 WD |
159 | /* Note the fds used for the main socket (which might really be a pipe |
160 | * for a local transfer, but we can ignore that). */ | |
161 | void io_set_sock_fds(int f_in, int f_out) | |
162 | { | |
163 | sock_f_in = f_in; | |
164 | sock_f_out = f_out; | |
165 | } | |
166 | ||
98f8c9a5 WD |
167 | /* Setup the fd used to receive MSG_* messages. Only needed during the |
168 | * early stages of being a local sender (up through the sending of the | |
169 | * file list) or when we're the generator (to fetch the messages from | |
170 | * the receiver). */ | |
d17e1dd2 WD |
171 | void set_msg_fd_in(int fd) |
172 | { | |
173 | msg_fd_in = fd; | |
174 | } | |
175 | ||
98f8c9a5 WD |
176 | /* Setup the fd used to send our MSG_* messages. Only needed when |
177 | * we're the receiver (to send our messages to the generator). */ | |
d17e1dd2 WD |
178 | void set_msg_fd_out(int fd) |
179 | { | |
180 | msg_fd_out = fd; | |
181 | set_nonblocking(msg_fd_out); | |
182 | } | |
183 | ||
184 | /* Add a message to the pending MSG_* list. */ | |
185 | static void msg_list_add(int code, char *buf, int len) | |
554e0a8d | 186 | { |
d17e1dd2 WD |
187 | struct msg_list *ml; |
188 | ||
189 | if (!(ml = new(struct msg_list))) | |
190 | exit_cleanup(RERR_MALLOC); | |
191 | ml->next = NULL; | |
192 | if (!(ml->buf = new_array(char, len+4))) | |
193 | exit_cleanup(RERR_MALLOC); | |
194 | SIVAL(ml->buf, 0, ((code+MPLEX_BASE)<<24) | len); | |
195 | memcpy(ml->buf+4, buf, len); | |
196 | ml->len = len+4; | |
197 | if (msg_list_tail) | |
198 | msg_list_tail->next = ml; | |
199 | else | |
200 | msg_list_head = ml; | |
201 | msg_list_tail = ml; | |
554e0a8d AT |
202 | } |
203 | ||
d17e1dd2 WD |
204 | void send_msg(enum msgcode code, char *buf, int len) |
205 | { | |
206 | msg_list_add(code, buf, len); | |
207 | msg_list_push(NORMAL_FLUSH); | |
208 | } | |
209 | ||
98f8c9a5 WD |
210 | /* Read a message from the MSG_* fd and handle it. This is called either |
211 | * during the early stages of being a local sender (up through the sending | |
212 | * of the file list) or when we're the generator (to fetch the messages | |
213 | * from the receiver). */ | |
d17e1dd2 | 214 | static void read_msg_fd(void) |
554e0a8d | 215 | { |
f9c6b3e7 | 216 | char buf[2048]; |
06ce139f | 217 | size_t n; |
d17e1dd2 | 218 | int fd = msg_fd_in; |
ff41a59f AT |
219 | int tag, len; |
220 | ||
00bdf899 WD |
221 | /* Temporarily disable msg_fd_in. This is needed to avoid looping back |
222 | * to this routine from read_timeout() and writefd_unbuffered(). */ | |
d17e1dd2 | 223 | msg_fd_in = -1; |
554e0a8d | 224 | |
ff41a59f AT |
225 | read_loop(fd, buf, 4); |
226 | tag = IVAL(buf, 0); | |
227 | ||
228 | len = tag & 0xFFFFFF; | |
d17e1dd2 | 229 | tag = (tag >> 24) - MPLEX_BASE; |
ff41a59f | 230 | |
d17e1dd2 WD |
231 | switch (tag) { |
232 | case MSG_DONE: | |
98f8c9a5 | 233 | if (len != 0 || !am_generator) { |
13c7bcbb | 234 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
d17e1dd2 | 235 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 236 | } |
d17e1dd2 WD |
237 | redo_list_add(-1); |
238 | break; | |
239 | case MSG_REDO: | |
98f8c9a5 | 240 | if (len != 4 || !am_generator) { |
13c7bcbb | 241 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
d17e1dd2 | 242 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 243 | } |
d17e1dd2 WD |
244 | read_loop(fd, buf, 4); |
245 | redo_list_add(IVAL(buf,0)); | |
246 | break; | |
247 | case MSG_INFO: | |
248 | case MSG_ERROR: | |
249 | case MSG_LOG: | |
250 | while (len) { | |
251 | n = len; | |
252 | if (n >= sizeof buf) | |
253 | n = sizeof buf - 1; | |
254 | read_loop(fd, buf, n); | |
255 | rwrite((enum logcode)tag, buf, n); | |
256 | len -= n; | |
257 | } | |
258 | break; | |
259 | default: | |
13c7bcbb | 260 | rprintf(FERROR, "unknown message %d:%d\n", tag, len); |
d17e1dd2 WD |
261 | exit_cleanup(RERR_STREAMIO); |
262 | } | |
263 | ||
264 | msg_fd_in = fd; | |
265 | } | |
266 | ||
267 | /* Try to push messages off the list onto the wire. If we leave with more | |
268 | * to do, return 0. On error, return -1. If everything flushed, return 1. | |
f9c6b3e7 | 269 | * This is only active in the receiver. */ |
d17e1dd2 WD |
270 | int msg_list_push(int flush_it_all) |
271 | { | |
272 | static int written = 0; | |
273 | struct timeval tv; | |
274 | fd_set fds; | |
275 | ||
276 | if (msg_fd_out < 0) | |
277 | return -1; | |
278 | ||
279 | while (msg_list_head) { | |
280 | struct msg_list *ml = msg_list_head; | |
281 | int n = write(msg_fd_out, ml->buf + written, ml->len - written); | |
282 | if (n < 0) { | |
283 | if (errno == EINTR) | |
284 | continue; | |
285 | if (errno != EWOULDBLOCK && errno != EAGAIN) | |
286 | return -1; | |
287 | if (!flush_it_all) | |
288 | return 0; | |
289 | FD_ZERO(&fds); | |
290 | FD_SET(msg_fd_out, &fds); | |
e626b29e | 291 | tv.tv_sec = select_timeout; |
d17e1dd2 WD |
292 | tv.tv_usec = 0; |
293 | if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv)) | |
294 | check_timeout(); | |
295 | } else if ((written += n) == ml->len) { | |
296 | free(ml->buf); | |
297 | msg_list_head = ml->next; | |
298 | if (!msg_list_head) | |
299 | msg_list_tail = NULL; | |
300 | free(ml); | |
301 | written = 0; | |
302 | } | |
554e0a8d | 303 | } |
d17e1dd2 WD |
304 | return 1; |
305 | } | |
306 | ||
307 | int get_redo_num(void) | |
308 | { | |
309 | struct redo_list *next; | |
310 | int num; | |
311 | ||
312 | while (!redo_list_head) | |
313 | read_msg_fd(); | |
554e0a8d | 314 | |
d17e1dd2 WD |
315 | num = redo_list_head->num; |
316 | next = redo_list_head->next; | |
317 | free(redo_list_head); | |
318 | redo_list_head = next; | |
319 | if (!next) | |
320 | redo_list_tail = NULL; | |
321 | ||
322 | return num; | |
554e0a8d AT |
323 | } |
324 | ||
56014c8c WD |
325 | /** |
326 | * When we're the receiver and we have a local --files-from list of names | |
327 | * that needs to be sent over the socket to the sender, we have to do two | |
328 | * things at the same time: send the sender a list of what files we're | |
329 | * processing and read the incoming file+info list from the sender. We do | |
330 | * this by augmenting the read_timeout() function to copy this data. It | |
331 | * uses the io_filesfrom_buf to read a block of data from f_in (when it is | |
332 | * ready, since it might be a pipe) and then blast it out f_out (when it | |
333 | * is ready to receive more data). | |
334 | */ | |
335 | void io_set_filesfrom_fds(int f_in, int f_out) | |
336 | { | |
337 | io_filesfrom_f_in = f_in; | |
338 | io_filesfrom_f_out = f_out; | |
339 | io_filesfrom_bp = io_filesfrom_buf; | |
340 | io_filesfrom_lastchar = '\0'; | |
341 | io_filesfrom_buflen = 0; | |
342 | } | |
720b47f2 | 343 | |
880da007 MP |
344 | /** |
345 | * It's almost always an error to get an EOF when we're trying to read | |
346 | * from the network, because the protocol is self-terminating. | |
347 | * | |
348 | * However, there is one unfortunate cases where it is not, which is | |
349 | * rsync <2.4.6 sending a list of modules on a server, since the list | |
350 | * is terminated by closing the socket. So, for the section of the | |
351 | * program where that is a problem (start_socket_client), | |
352 | * kludge_around_eof is True and we just exit. | |
353 | */ | |
1f75bb10 | 354 | static void whine_about_eof(int fd) |
7a55d06e | 355 | { |
1f75bb10 | 356 | if (kludge_around_eof && fd == sock_f_in) |
3151cbae | 357 | exit_cleanup(0); |
3151cbae | 358 | |
00bdf899 | 359 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
dca68b0a WD |
360 | "(%.0f bytes received so far) [%s]\n", |
361 | (double)stats.total_read, who_am_i()); | |
00bdf899 WD |
362 | |
363 | exit_cleanup(RERR_STREAMIO); | |
7a55d06e | 364 | } |
720b47f2 | 365 | |
7a55d06e | 366 | |
880da007 | 367 | /** |
6ed6d7f5 | 368 | * Read from a socket with I/O timeout. return the number of bytes |
c3563c46 MP |
369 | * read. If no bytes can be read then exit, never return a number <= 0. |
370 | * | |
8886f8d0 MP |
371 | * TODO: If the remote shell connection fails, then current versions |
372 | * actually report an "unexpected EOF" error here. Since it's a | |
373 | * fairly common mistake to try to use rsh when ssh is required, we | |
374 | * should trap that: if we fail to read any data at all, we should | |
375 | * give a better explanation. We can tell whether the connection has | |
376 | * started by looking e.g. at whether the remote version is known yet. | |
c3563c46 | 377 | */ |
3151cbae | 378 | static int read_timeout(int fd, char *buf, size_t len) |
8d9dc9f9 | 379 | { |
d62bcc17 | 380 | int n, ret = 0; |
4c36ddbe | 381 | |
d17e1dd2 | 382 | io_flush(NORMAL_FLUSH); |
ea2111d1 | 383 | |
4c36ddbe | 384 | while (ret == 0) { |
7a55d06e | 385 | /* until we manage to read *something* */ |
56014c8c | 386 | fd_set r_fds, w_fds; |
4c36ddbe | 387 | struct timeval tv; |
1ea087a7 | 388 | int maxfd = fd; |
a57873b7 | 389 | int count; |
4c36ddbe | 390 | |
56014c8c | 391 | FD_ZERO(&r_fds); |
a7026ba9 | 392 | FD_ZERO(&w_fds); |
56014c8c | 393 | FD_SET(fd, &r_fds); |
d17e1dd2 WD |
394 | if (msg_fd_in >= 0) { |
395 | FD_SET(msg_fd_in, &r_fds); | |
1ea087a7 WD |
396 | if (msg_fd_in > maxfd) |
397 | maxfd = msg_fd_in; | |
4033b80b WD |
398 | } else if (msg_list_head) { |
399 | FD_SET(msg_fd_out, &w_fds); | |
1ea087a7 WD |
400 | if (msg_fd_out > maxfd) |
401 | maxfd = msg_fd_out; | |
56014c8c | 402 | } |
3309507d | 403 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
404 | int new_fd; |
405 | if (io_filesfrom_buflen == 0) { | |
3309507d | 406 | if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
407 | FD_SET(io_filesfrom_f_in, &r_fds); |
408 | new_fd = io_filesfrom_f_in; | |
409 | } else { | |
410 | io_filesfrom_f_out = -1; | |
411 | new_fd = -1; | |
412 | } | |
413 | } else { | |
56014c8c WD |
414 | FD_SET(io_filesfrom_f_out, &w_fds); |
415 | new_fd = io_filesfrom_f_out; | |
416 | } | |
1ea087a7 WD |
417 | if (new_fd > maxfd) |
418 | maxfd = new_fd; | |
554e0a8d AT |
419 | } |
420 | ||
e626b29e | 421 | tv.tv_sec = select_timeout; |
4c36ddbe AT |
422 | tv.tv_usec = 0; |
423 | ||
554e0a8d AT |
424 | errno = 0; |
425 | ||
a7026ba9 | 426 | count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); |
a57873b7 | 427 | |
a57873b7 | 428 | if (count <= 0) { |
f89b9368 | 429 | if (errno == EBADF) |
554e0a8d | 430 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 431 | check_timeout(); |
4c36ddbe AT |
432 | continue; |
433 | } | |
434 | ||
d17e1dd2 WD |
435 | if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds)) |
436 | read_msg_fd(); | |
4033b80b WD |
437 | else if (msg_list_head && FD_ISSET(msg_fd_out, &w_fds)) |
438 | msg_list_push(NORMAL_FLUSH); | |
554e0a8d | 439 | |
3309507d | 440 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
441 | if (io_filesfrom_buflen) { |
442 | if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { | |
443 | int l = write(io_filesfrom_f_out, | |
444 | io_filesfrom_bp, | |
445 | io_filesfrom_buflen); | |
446 | if (l > 0) { | |
447 | if (!(io_filesfrom_buflen -= l)) | |
448 | io_filesfrom_bp = io_filesfrom_buf; | |
449 | else | |
450 | io_filesfrom_bp += l; | |
451 | } else { | |
452 | /* XXX should we complain? */ | |
453 | io_filesfrom_f_out = -1; | |
454 | } | |
455 | } | |
3309507d | 456 | } else if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
457 | if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { |
458 | int l = read(io_filesfrom_f_in, | |
459 | io_filesfrom_buf, | |
460 | sizeof io_filesfrom_buf); | |
461 | if (l <= 0) { | |
462 | /* Send end-of-file marker */ | |
463 | io_filesfrom_buf[0] = '\0'; | |
464 | io_filesfrom_buf[1] = '\0'; | |
465 | io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1; | |
466 | io_filesfrom_f_in = -1; | |
467 | } else { | |
56014c8c WD |
468 | if (!eol_nulls) { |
469 | char *s = io_filesfrom_buf + l; | |
470 | /* Transform CR and/or LF into '\0' */ | |
471 | while (s-- > io_filesfrom_buf) { | |
472 | if (*s == '\n' || *s == '\r') | |
473 | *s = '\0'; | |
474 | } | |
475 | } | |
476 | if (!io_filesfrom_lastchar) { | |
477 | /* Last buf ended with a '\0', so don't | |
478 | * let this buf start with one. */ | |
479 | while (l && !*io_filesfrom_bp) | |
480 | io_filesfrom_bp++, l--; | |
481 | } | |
482 | if (!l) | |
483 | io_filesfrom_bp = io_filesfrom_buf; | |
484 | else { | |
485 | char *f = io_filesfrom_bp; | |
486 | char *t = f; | |
487 | char *eob = f + l; | |
488 | /* Eliminate any multi-'\0' runs. */ | |
489 | while (f != eob) { | |
490 | if (!(*t++ = *f++)) { | |
491 | while (f != eob && !*f) | |
492 | f++, l--; | |
493 | } | |
494 | } | |
495 | io_filesfrom_lastchar = f[-1]; | |
496 | } | |
497 | io_filesfrom_buflen = l; | |
498 | } | |
499 | } | |
500 | } | |
501 | } | |
502 | ||
f89b9368 WD |
503 | if (!FD_ISSET(fd, &r_fds)) |
504 | continue; | |
554e0a8d | 505 | |
4c36ddbe AT |
506 | n = read(fd, buf, len); |
507 | ||
1ea087a7 WD |
508 | if (n <= 0) { |
509 | if (n == 0) | |
1f75bb10 | 510 | whine_about_eof(fd); /* Doesn't return. */ |
d62bcc17 WD |
511 | if (errno == EINTR || errno == EWOULDBLOCK |
512 | || errno == EAGAIN) | |
7a55d06e | 513 | continue; |
1f75bb10 WD |
514 | |
515 | /* Don't write errors on a dead socket. */ | |
516 | if (fd == sock_f_in) | |
7f459268 | 517 | close_multiplexing_out(); |
1f75bb10 WD |
518 | rsyserr(FERROR, errno, "read error"); |
519 | exit_cleanup(RERR_STREAMIO); | |
8d9dc9f9 | 520 | } |
00bdf899 WD |
521 | |
522 | buf += n; | |
523 | len -= n; | |
524 | ret += n; | |
1f75bb10 WD |
525 | |
526 | if (io_timeout && fd == sock_f_in) | |
00bdf899 | 527 | last_io = time(NULL); |
4c36ddbe | 528 | } |
8d9dc9f9 | 529 | |
4c36ddbe AT |
530 | return ret; |
531 | } | |
8d9dc9f9 | 532 | |
56014c8c WD |
533 | /** |
534 | * Read a line into the "fname" buffer (which must be at least MAXPATHLEN | |
535 | * characters long). | |
536 | */ | |
537 | int read_filesfrom_line(int fd, char *fname) | |
538 | { | |
539 | char ch, *s, *eob = fname + MAXPATHLEN - 1; | |
540 | int cnt; | |
55d5937d | 541 | int reading_remotely = remote_filesfrom_file != NULL; |
56014c8c WD |
542 | int nulls = eol_nulls || reading_remotely; |
543 | ||
544 | start: | |
545 | s = fname; | |
546 | while (1) { | |
547 | cnt = read(fd, &ch, 1); | |
548 | if (cnt < 0 && (errno == EWOULDBLOCK | |
549 | || errno == EINTR || errno == EAGAIN)) { | |
550 | struct timeval tv; | |
551 | fd_set fds; | |
552 | FD_ZERO(&fds); | |
553 | FD_SET(fd, &fds); | |
e626b29e | 554 | tv.tv_sec = select_timeout; |
56014c8c WD |
555 | tv.tv_usec = 0; |
556 | if (!select(fd+1, &fds, NULL, NULL, &tv)) | |
557 | check_timeout(); | |
558 | continue; | |
559 | } | |
560 | if (cnt != 1) | |
561 | break; | |
562 | if (nulls? !ch : (ch == '\r' || ch == '\n')) { | |
563 | /* Skip empty lines if reading locally. */ | |
564 | if (!reading_remotely && s == fname) | |
565 | continue; | |
566 | break; | |
567 | } | |
568 | if (s < eob) | |
569 | *s++ = ch; | |
570 | } | |
571 | *s = '\0'; | |
7a55d06e | 572 | |
6b45fcf1 WD |
573 | /* Dump comments. */ |
574 | if (*fname == '#' || *fname == ';') | |
56014c8c WD |
575 | goto start; |
576 | ||
577 | return s - fname; | |
578 | } | |
7a55d06e MP |
579 | |
580 | ||
1f75bb10 WD |
581 | static char *iobuf_out; |
582 | static int iobuf_out_cnt; | |
583 | ||
584 | void io_start_buffering_out(void) | |
585 | { | |
586 | if (iobuf_out) | |
587 | return; | |
588 | if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) | |
589 | out_of_memory("io_start_buffering_out"); | |
590 | iobuf_out_cnt = 0; | |
591 | } | |
592 | ||
593 | ||
594 | static char *iobuf_in; | |
595 | static size_t iobuf_in_siz; | |
596 | ||
597 | void io_start_buffering_in(void) | |
598 | { | |
599 | if (iobuf_in) | |
600 | return; | |
601 | iobuf_in_siz = 2 * IO_BUFFER_SIZE; | |
602 | if (!(iobuf_in = new_array(char, iobuf_in_siz))) | |
603 | out_of_memory("io_start_buffering_in"); | |
604 | } | |
605 | ||
606 | ||
607 | void io_end_buffering(void) | |
608 | { | |
609 | io_flush(NORMAL_FLUSH); | |
610 | if (!io_multiplexing_out) { | |
611 | free(iobuf_out); | |
612 | iobuf_out = NULL; | |
613 | } | |
614 | } | |
615 | ||
616 | ||
880da007 MP |
617 | /** |
618 | * Continue trying to read len bytes - don't return until len has been | |
619 | * read. | |
620 | **/ | |
3151cbae | 621 | static void read_loop(int fd, char *buf, size_t len) |
4c36ddbe AT |
622 | { |
623 | while (len) { | |
624 | int n = read_timeout(fd, buf, len); | |
625 | ||
626 | buf += n; | |
627 | len -= n; | |
8d9dc9f9 AT |
628 | } |
629 | } | |
630 | ||
7a55d06e MP |
631 | |
632 | /** | |
633 | * Read from the file descriptor handling multiplexing - return number | |
634 | * of bytes read. | |
d62bcc17 WD |
635 | * |
636 | * Never returns <= 0. | |
7a55d06e | 637 | */ |
c399d22a | 638 | static int readfd_unbuffered(int fd, char *buf, size_t len) |
8d9dc9f9 | 639 | { |
6fe25398 | 640 | static size_t remaining; |
1f75bb10 | 641 | static size_t iobuf_in_ndx; |
909ce14f | 642 | int tag, ret = 0; |
8d9dc9f9 AT |
643 | char line[1024]; |
644 | ||
1f75bb10 | 645 | if (!iobuf_in || fd != sock_f_in) |
4c36ddbe | 646 | return read_timeout(fd, buf, len); |
8d9dc9f9 | 647 | |
76c21947 | 648 | if (!io_multiplexing_in && remaining == 0) { |
1f75bb10 WD |
649 | remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); |
650 | iobuf_in_ndx = 0; | |
76c21947 WD |
651 | } |
652 | ||
8d9dc9f9 AT |
653 | while (ret == 0) { |
654 | if (remaining) { | |
655 | len = MIN(len, remaining); | |
1f75bb10 WD |
656 | memcpy(buf, iobuf_in + iobuf_in_ndx, len); |
657 | iobuf_in_ndx += len; | |
8d9dc9f9 AT |
658 | remaining -= len; |
659 | ret = len; | |
76c21947 | 660 | break; |
8d9dc9f9 AT |
661 | } |
662 | ||
909ce14f | 663 | read_loop(fd, line, 4); |
ff41a59f | 664 | tag = IVAL(line, 0); |
679e7657 | 665 | |
8d9dc9f9 | 666 | remaining = tag & 0xFFFFFF; |
d17e1dd2 | 667 | tag = (tag >> 24) - MPLEX_BASE; |
8d9dc9f9 | 668 | |
d17e1dd2 WD |
669 | switch (tag) { |
670 | case MSG_DATA: | |
1f75bb10 WD |
671 | if (remaining > iobuf_in_siz) { |
672 | if (!(iobuf_in = realloc_array(iobuf_in, char, | |
673 | remaining))) | |
c399d22a | 674 | out_of_memory("readfd_unbuffered"); |
1f75bb10 | 675 | iobuf_in_siz = remaining; |
76c21947 | 676 | } |
1f75bb10 WD |
677 | read_loop(fd, iobuf_in, remaining); |
678 | iobuf_in_ndx = 0; | |
d17e1dd2 WD |
679 | break; |
680 | case MSG_INFO: | |
681 | case MSG_ERROR: | |
682 | if (remaining >= sizeof line) { | |
bd9fca47 WD |
683 | rprintf(FERROR, |
684 | "[%s] multiplexing overflow %d:%ld\n\n", | |
685 | who_am_i(), tag, (long)remaining); | |
d17e1dd2 WD |
686 | exit_cleanup(RERR_STREAMIO); |
687 | } | |
688 | read_loop(fd, line, remaining); | |
689 | rwrite((enum logcode)tag, line, remaining); | |
690 | remaining = 0; | |
691 | break; | |
692 | default: | |
bd9fca47 WD |
693 | rprintf(FERROR, "[%s] unexpected tag %d\n", |
694 | who_am_i(), tag); | |
65417579 | 695 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 696 | } |
8d9dc9f9 AT |
697 | } |
698 | ||
76c21947 | 699 | if (remaining == 0) |
d17e1dd2 | 700 | io_flush(NORMAL_FLUSH); |
76c21947 | 701 | |
8d9dc9f9 AT |
702 | return ret; |
703 | } | |
704 | ||
705 | ||
909ce14f | 706 | |
880da007 MP |
707 | /** |
708 | * Do a buffered read from @p fd. Don't return until all @p n bytes | |
709 | * have been read. If all @p n can't be read then exit with an | |
710 | * error. | |
711 | **/ | |
3151cbae | 712 | static void readfd(int fd, char *buffer, size_t N) |
720b47f2 | 713 | { |
6ba9279f | 714 | int ret; |
d62bcc17 | 715 | size_t total = 0; |
3151cbae | 716 | |
6ba9279f | 717 | while (total < N) { |
c399d22a | 718 | ret = readfd_unbuffered(fd, buffer + total, N-total); |
6ba9279f | 719 | total += ret; |
7f28dbee | 720 | } |
1b7c47cb | 721 | |
b9f592fb WD |
722 | if (fd == write_batch_monitor_in) { |
723 | if ((size_t)write(batch_fd, buffer, total) != total) | |
724 | exit_cleanup(RERR_FILEIO); | |
725 | } | |
1f75bb10 WD |
726 | |
727 | if (fd == sock_f_in) | |
728 | stats.total_read += total; | |
720b47f2 AT |
729 | } |
730 | ||
731 | ||
b7922338 | 732 | int32 read_int(int f) |
720b47f2 | 733 | { |
4c36ddbe | 734 | char b[4]; |
d730b113 AT |
735 | int32 ret; |
736 | ||
4c36ddbe | 737 | readfd(f,b,4); |
d730b113 | 738 | ret = IVAL(b,0); |
f89b9368 WD |
739 | if (ret == (int32)0xffffffff) |
740 | return -1; | |
d730b113 | 741 | return ret; |
720b47f2 AT |
742 | } |
743 | ||
71c46176 | 744 | int64 read_longint(int f) |
3a6a366f | 745 | { |
71c46176 | 746 | int64 ret; |
3a6a366f AT |
747 | char b[8]; |
748 | ret = read_int(f); | |
71c46176 | 749 | |
f89b9368 | 750 | if ((int32)ret != (int32)0xffffffff) |
8de330a3 | 751 | return ret; |
71c46176 | 752 | |
28deecca WD |
753 | #ifdef INT64_IS_OFF_T |
754 | if (sizeof (int64) < 8) { | |
755 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
756 | exit_cleanup(RERR_UNSUPPORTED); | |
757 | } | |
758 | #endif | |
91c4da3f S |
759 | readfd(f,b,8); |
760 | ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); | |
71c46176 | 761 | |
3a6a366f AT |
762 | return ret; |
763 | } | |
764 | ||
9dd891bb | 765 | void read_buf(int f,char *buf,size_t len) |
720b47f2 | 766 | { |
4c36ddbe | 767 | readfd(f,buf,len); |
720b47f2 AT |
768 | } |
769 | ||
9dd891bb | 770 | void read_sbuf(int f,char *buf,size_t len) |
575f2fca | 771 | { |
93095cbe | 772 | readfd(f, buf, len); |
575f2fca AT |
773 | buf[len] = 0; |
774 | } | |
775 | ||
182dca5c AT |
776 | unsigned char read_byte(int f) |
777 | { | |
4c36ddbe | 778 | unsigned char c; |
93095cbe | 779 | readfd(f, (char *)&c, 1); |
4c36ddbe | 780 | return c; |
182dca5c | 781 | } |
720b47f2 | 782 | |
188fed95 WD |
783 | /* Populate a sum_struct with values from the socket. This is |
784 | * called by both the sender and the receiver. */ | |
785 | void read_sum_head(int f, struct sum_struct *sum) | |
786 | { | |
787 | sum->count = read_int(f); | |
788 | sum->blength = read_int(f); | |
789 | if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { | |
790 | rprintf(FERROR, "Invalid block length %ld\n", | |
791 | (long)sum->blength); | |
792 | exit_cleanup(RERR_PROTOCOL); | |
793 | } | |
794 | sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); | |
795 | if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) { | |
796 | rprintf(FERROR, "Invalid checksum length %d\n", sum->s2length); | |
797 | exit_cleanup(RERR_PROTOCOL); | |
798 | } | |
799 | sum->remainder = read_int(f); | |
800 | if (sum->remainder < 0 || sum->remainder > sum->blength) { | |
801 | rprintf(FERROR, "Invalid remainder length %ld\n", | |
802 | (long)sum->remainder); | |
803 | exit_cleanup(RERR_PROTOCOL); | |
804 | } | |
805 | } | |
806 | ||
c207d7ec WD |
807 | /* Send the values from a sum_struct over the socket. Set sum to |
808 | * NULL if there are no checksums to send. This is called by both | |
809 | * the generator and the sender. */ | |
810 | void write_sum_head(int f, struct sum_struct *sum) | |
811 | { | |
812 | static struct sum_struct null_sum; | |
813 | ||
814 | if (sum == NULL) | |
815 | sum = &null_sum; | |
816 | ||
817 | write_int(f, sum->count); | |
818 | write_int(f, sum->blength); | |
819 | if (protocol_version >= 27) | |
820 | write_int(f, sum->s2length); | |
821 | write_int(f, sum->remainder); | |
822 | } | |
823 | ||
880da007 | 824 | |
08571358 MP |
825 | /** |
826 | * Sleep after writing to limit I/O bandwidth usage. | |
827 | * | |
828 | * @todo Rather than sleeping after each write, it might be better to | |
829 | * use some kind of averaging. The current algorithm seems to always | |
830 | * use a bit less bandwidth than specified, because it doesn't make up | |
831 | * for slow periods. But arguably this is a feature. In addition, we | |
832 | * ought to take the time used to write the data into account. | |
71e58630 WD |
833 | * |
834 | * During some phases of big transfers (file FOO is uptodate) this is | |
835 | * called with a small bytes_written every time. As the kernel has to | |
836 | * round small waits up to guarantee that we actually wait at least the | |
837 | * requested number of microseconds, this can become grossly inaccurate. | |
838 | * We therefore keep track of the bytes we've written over time and only | |
839 | * sleep when the accumulated delay is at least 1 tenth of a second. | |
08571358 MP |
840 | **/ |
841 | static void sleep_for_bwlimit(int bytes_written) | |
842 | { | |
71e58630 WD |
843 | static struct timeval prior_tv; |
844 | static long total_written = 0; | |
845 | struct timeval tv, start_tv; | |
846 | long elapsed_usec, sleep_usec; | |
847 | ||
848 | #define ONE_SEC 1000000L /* # of microseconds in a second */ | |
08571358 MP |
849 | |
850 | if (!bwlimit) | |
851 | return; | |
e681e820 | 852 | |
71e58630 WD |
853 | total_written += bytes_written; |
854 | ||
855 | gettimeofday(&start_tv, NULL); | |
856 | if (prior_tv.tv_sec) { | |
857 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC | |
858 | + (start_tv.tv_usec - prior_tv.tv_usec); | |
859 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); | |
860 | if (total_written < 0) | |
861 | total_written = 0; | |
862 | } | |
3151cbae | 863 | |
71e58630 WD |
864 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
865 | if (sleep_usec < ONE_SEC / 10) { | |
866 | prior_tv = start_tv; | |
867 | return; | |
868 | } | |
08571358 | 869 | |
71e58630 WD |
870 | tv.tv_sec = sleep_usec / ONE_SEC; |
871 | tv.tv_usec = sleep_usec % ONE_SEC; | |
98b332ed | 872 | select(0, NULL, NULL, NULL, &tv); |
71e58630 WD |
873 | |
874 | gettimeofday(&prior_tv, NULL); | |
875 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC | |
876 | + (prior_tv.tv_usec - start_tv.tv_usec); | |
877 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); | |
08571358 MP |
878 | } |
879 | ||
880 | ||
1f75bb10 WD |
881 | /* Write len bytes to the file descriptor fd, looping as necessary to get |
882 | * the job done and also (in the generator) reading any data on msg_fd_in | |
883 | * (to avoid deadlock). | |
880da007 MP |
884 | * |
885 | * This function underlies the multiplexing system. The body of the | |
1f75bb10 | 886 | * application never calls this function directly. */ |
9dd891bb | 887 | static void writefd_unbuffered(int fd,char *buf,size_t len) |
720b47f2 | 888 | { |
1ea087a7 | 889 | size_t n, total = 0; |
8d9dc9f9 | 890 | fd_set w_fds, r_fds; |
1ea087a7 | 891 | int maxfd, count, ret; |
8d9dc9f9 | 892 | struct timeval tv; |
720b47f2 | 893 | |
e44f9a12 AT |
894 | no_flush++; |
895 | ||
4c36ddbe | 896 | while (total < len) { |
8d9dc9f9 | 897 | FD_ZERO(&w_fds); |
8d9dc9f9 | 898 | FD_SET(fd,&w_fds); |
1ea087a7 | 899 | maxfd = fd; |
4c36ddbe | 900 | |
d17e1dd2 | 901 | if (msg_fd_in >= 0) { |
56014c8c | 902 | FD_ZERO(&r_fds); |
d17e1dd2 | 903 | FD_SET(msg_fd_in,&r_fds); |
1ea087a7 WD |
904 | if (msg_fd_in > maxfd) |
905 | maxfd = msg_fd_in; | |
8d9dc9f9 | 906 | } |
41cfde6b WD |
907 | if (fd != sock_f_out && iobuf_out_cnt && no_flush == 1) { |
908 | FD_SET(sock_f_out, &w_fds); | |
909 | if (sock_f_out > maxfd) | |
910 | maxfd = sock_f_out; | |
911 | } | |
8d9dc9f9 | 912 | |
e626b29e | 913 | tv.tv_sec = select_timeout; |
8d9dc9f9 | 914 | tv.tv_usec = 0; |
4c36ddbe | 915 | |
554e0a8d | 916 | errno = 0; |
1ea087a7 | 917 | count = select(maxfd + 1, msg_fd_in >= 0 ? &r_fds : NULL, |
d17e1dd2 | 918 | &w_fds, NULL, &tv); |
4c36ddbe AT |
919 | |
920 | if (count <= 0) { | |
1ea087a7 | 921 | if (count < 0 && errno == EBADF) |
554e0a8d | 922 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 923 | check_timeout(); |
8d9dc9f9 AT |
924 | continue; |
925 | } | |
4c36ddbe | 926 | |
d17e1dd2 WD |
927 | if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds)) |
928 | read_msg_fd(); | |
554e0a8d | 929 | |
41cfde6b WD |
930 | if (!FD_ISSET(fd, &w_fds)) { |
931 | if (fd != sock_f_out && iobuf_out_cnt) { | |
932 | no_flush--; | |
933 | io_flush(NORMAL_FLUSH); | |
934 | no_flush++; | |
935 | } | |
1ea087a7 | 936 | continue; |
41cfde6b | 937 | } |
4c36ddbe | 938 | |
1ea087a7 WD |
939 | n = len - total; |
940 | if (bwlimit && n > bwlimit_writemax) | |
941 | n = bwlimit_writemax; | |
942 | ret = write(fd, buf + total, n); | |
943 | ||
944 | if (ret <= 0) { | |
3309507d WD |
945 | if (ret < 0) { |
946 | if (errno == EINTR) | |
947 | continue; | |
948 | if (errno == EWOULDBLOCK || errno == EAGAIN) { | |
949 | msleep(1); | |
950 | continue; | |
951 | } | |
f0359dd0 AT |
952 | } |
953 | ||
1ea087a7 | 954 | /* Don't try to write errors back across the stream. */ |
1f75bb10 | 955 | if (fd == sock_f_out) |
7f459268 | 956 | close_multiplexing_out(); |
1ea087a7 | 957 | rsyserr(FERROR, errno, |
dca68b0a WD |
958 | "writefd_unbuffered failed to write %ld bytes: phase \"%s\" [%s]", |
959 | (long)len, io_write_phase, who_am_i()); | |
d1b31da7 WD |
960 | /* If the other side is sending us error messages, try |
961 | * to grab any messages they sent before they died. */ | |
7f459268 | 962 | while (fd == sock_f_out && io_multiplexing_in) { |
ef0c03ff | 963 | io_timeout = select_timeout = 30; |
d1b31da7 WD |
964 | readfd_unbuffered(sock_f_in, io_filesfrom_buf, |
965 | sizeof io_filesfrom_buf); | |
966 | } | |
1ea087a7 WD |
967 | exit_cleanup(RERR_STREAMIO); |
968 | } | |
4c36ddbe | 969 | |
1ea087a7 | 970 | total += ret; |
a800434a | 971 | |
1f75bb10 WD |
972 | if (fd == sock_f_out) { |
973 | if (io_timeout) | |
974 | last_io = time(NULL); | |
975 | sleep_for_bwlimit(ret); | |
976 | } | |
4c36ddbe | 977 | } |
e44f9a12 AT |
978 | |
979 | no_flush--; | |
720b47f2 AT |
980 | } |
981 | ||
8d9dc9f9 | 982 | |
880da007 MP |
983 | /** |
984 | * Write an message to a multiplexed stream. If this fails then rsync | |
985 | * exits. | |
986 | **/ | |
1f75bb10 | 987 | static void mplex_write(enum msgcode code, char *buf, size_t len) |
ff41a59f AT |
988 | { |
989 | char buffer[4096]; | |
06ce139f | 990 | size_t n = len; |
8d9dc9f9 | 991 | |
ff41a59f AT |
992 | SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); |
993 | ||
c399d22a | 994 | if (n > sizeof buffer - 4) |
3151cbae | 995 | n = sizeof buffer - 4; |
ff41a59f AT |
996 | |
997 | memcpy(&buffer[4], buf, n); | |
1f75bb10 | 998 | writefd_unbuffered(sock_f_out, buffer, n+4); |
ff41a59f AT |
999 | |
1000 | len -= n; | |
1001 | buf += n; | |
1002 | ||
1ea087a7 | 1003 | if (len) |
1f75bb10 | 1004 | writefd_unbuffered(sock_f_out, buf, len); |
d6dead6b AT |
1005 | } |
1006 | ||
ff41a59f | 1007 | |
d17e1dd2 | 1008 | void io_flush(int flush_it_all) |
d6dead6b | 1009 | { |
d17e1dd2 | 1010 | msg_list_push(flush_it_all); |
90ba34e2 | 1011 | |
1f75bb10 | 1012 | if (!iobuf_out_cnt || no_flush) |
d17e1dd2 | 1013 | return; |
8d9dc9f9 | 1014 | |
d17e1dd2 | 1015 | if (io_multiplexing_out) |
1f75bb10 | 1016 | mplex_write(MSG_DATA, iobuf_out, iobuf_out_cnt); |
d17e1dd2 | 1017 | else |
1f75bb10 WD |
1018 | writefd_unbuffered(sock_f_out, iobuf_out, iobuf_out_cnt); |
1019 | iobuf_out_cnt = 0; | |
8d9dc9f9 AT |
1020 | } |
1021 | ||
0ba48136 | 1022 | |
9dd891bb | 1023 | static void writefd(int fd,char *buf,size_t len) |
d6dead6b | 1024 | { |
4033b80b WD |
1025 | if (fd == msg_fd_out) { |
1026 | rprintf(FERROR, "Internal error: wrong write used in receiver.\n"); | |
1027 | exit_cleanup(RERR_PROTOCOL); | |
1028 | } | |
90ba34e2 | 1029 | |
1f75bb10 WD |
1030 | if (fd == sock_f_out) |
1031 | stats.total_written += len; | |
1032 | ||
b9f592fb WD |
1033 | if (fd == write_batch_monitor_out) { |
1034 | if ((size_t)write(batch_fd, buf, len) != len) | |
1035 | exit_cleanup(RERR_FILEIO); | |
1036 | } | |
1037 | ||
1f75bb10 | 1038 | if (!iobuf_out || fd != sock_f_out) { |
4c36ddbe AT |
1039 | writefd_unbuffered(fd, buf, len); |
1040 | return; | |
1041 | } | |
d6dead6b AT |
1042 | |
1043 | while (len) { | |
1f75bb10 | 1044 | int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt); |
d6dead6b | 1045 | if (n > 0) { |
1f75bb10 | 1046 | memcpy(iobuf_out+iobuf_out_cnt, buf, n); |
d6dead6b AT |
1047 | buf += n; |
1048 | len -= n; | |
1f75bb10 | 1049 | iobuf_out_cnt += n; |
d6dead6b | 1050 | } |
3151cbae | 1051 | |
1f75bb10 | 1052 | if (iobuf_out_cnt == IO_BUFFER_SIZE) |
d17e1dd2 | 1053 | io_flush(NORMAL_FLUSH); |
d6dead6b | 1054 | } |
d6dead6b | 1055 | } |
720b47f2 AT |
1056 | |
1057 | ||
b7922338 | 1058 | void write_int(int f,int32 x) |
720b47f2 | 1059 | { |
8d9dc9f9 AT |
1060 | char b[4]; |
1061 | SIVAL(b,0,x); | |
4c36ddbe | 1062 | writefd(f,b,4); |
720b47f2 AT |
1063 | } |
1064 | ||
7a24c346 | 1065 | |
805edf9d MP |
1066 | void write_int_named(int f, int32 x, const char *phase) |
1067 | { | |
1068 | io_write_phase = phase; | |
1069 | write_int(f, x); | |
1070 | io_write_phase = phase_unknown; | |
1071 | } | |
1072 | ||
1073 | ||
7a24c346 MP |
1074 | /* |
1075 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any | |
1076 | * 64-bit types on this platform. | |
1077 | */ | |
71c46176 | 1078 | void write_longint(int f, int64 x) |
3a6a366f | 1079 | { |
3a6a366f | 1080 | char b[8]; |
3a6a366f | 1081 | |
91c4da3f | 1082 | if (x <= 0x7FFFFFFF) { |
3a6a366f AT |
1083 | write_int(f, (int)x); |
1084 | return; | |
1085 | } | |
1086 | ||
28deecca WD |
1087 | #ifdef INT64_IS_OFF_T |
1088 | if (sizeof (int64) < 8) { | |
1089 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1090 | exit_cleanup(RERR_UNSUPPORTED); | |
1091 | } | |
1092 | #endif | |
1093 | ||
8de330a3 | 1094 | write_int(f, (int32)0xFFFFFFFF); |
3a6a366f AT |
1095 | SIVAL(b,0,(x&0xFFFFFFFF)); |
1096 | SIVAL(b,4,((x>>32)&0xFFFFFFFF)); | |
1097 | ||
4c36ddbe | 1098 | writefd(f,b,8); |
3a6a366f AT |
1099 | } |
1100 | ||
9dd891bb | 1101 | void write_buf(int f,char *buf,size_t len) |
720b47f2 | 1102 | { |
4c36ddbe | 1103 | writefd(f,buf,len); |
720b47f2 AT |
1104 | } |
1105 | ||
880da007 | 1106 | /** Write a string to the connection */ |
cf338ab1 | 1107 | void write_sbuf(int f, char *buf) |
f0fca04e | 1108 | { |
93095cbe | 1109 | writefd(f, buf, strlen(buf)); |
f0fca04e AT |
1110 | } |
1111 | ||
182dca5c AT |
1112 | void write_byte(int f,unsigned char c) |
1113 | { | |
93095cbe | 1114 | writefd(f, (char *)&c, 1); |
182dca5c AT |
1115 | } |
1116 | ||
7a55d06e MP |
1117 | |
1118 | ||
914cc65c | 1119 | /** |
6ed6d7f5 WD |
1120 | * Read a line of up to @p maxlen characters into @p buf (not counting |
1121 | * the trailing null). Strips the (required) trailing newline and all | |
1122 | * carriage returns. | |
914cc65c | 1123 | * |
6ed6d7f5 | 1124 | * @return 1 for success; 0 for I/O error or truncation. |
914cc65c | 1125 | **/ |
9dd891bb | 1126 | int read_line(int f, char *buf, size_t maxlen) |
f0fca04e AT |
1127 | { |
1128 | while (maxlen) { | |
528bfcd7 | 1129 | buf[0] = 0; |
f0fca04e | 1130 | read_buf(f, buf, 1); |
914cc65c MP |
1131 | if (buf[0] == 0) |
1132 | return 0; | |
6ed6d7f5 | 1133 | if (buf[0] == '\n') |
f0fca04e | 1134 | break; |
f0fca04e AT |
1135 | if (buf[0] != '\r') { |
1136 | buf++; | |
1137 | maxlen--; | |
1138 | } | |
1139 | } | |
6ed6d7f5 WD |
1140 | *buf = '\0'; |
1141 | return maxlen > 0; | |
f0fca04e AT |
1142 | } |
1143 | ||
1144 | ||
1145 | void io_printf(int fd, const char *format, ...) | |
1146 | { | |
d62bcc17 | 1147 | va_list ap; |
f0fca04e AT |
1148 | char buf[1024]; |
1149 | int len; | |
3151cbae | 1150 | |
f0fca04e | 1151 | va_start(ap, format); |
3151cbae | 1152 | len = vsnprintf(buf, sizeof buf, format, ap); |
f0fca04e AT |
1153 | va_end(ap); |
1154 | ||
f89b9368 WD |
1155 | if (len < 0) |
1156 | exit_cleanup(RERR_STREAMIO); | |
f0fca04e AT |
1157 | |
1158 | write_sbuf(fd, buf); | |
1159 | } | |
8d9dc9f9 AT |
1160 | |
1161 | ||
d17e1dd2 | 1162 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1163 | void io_start_multiplex_out(void) |
8d9dc9f9 | 1164 | { |
d17e1dd2 | 1165 | io_flush(NORMAL_FLUSH); |
1f75bb10 | 1166 | io_start_buffering_out(); |
8d9dc9f9 AT |
1167 | io_multiplexing_out = 1; |
1168 | } | |
1169 | ||
d17e1dd2 | 1170 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1171 | void io_start_multiplex_in(void) |
8d9dc9f9 | 1172 | { |
d17e1dd2 | 1173 | io_flush(NORMAL_FLUSH); |
1f75bb10 | 1174 | io_start_buffering_in(); |
8d9dc9f9 AT |
1175 | io_multiplexing_in = 1; |
1176 | } | |
1177 | ||
d17e1dd2 WD |
1178 | /** Write an message to the multiplexed data stream. */ |
1179 | int io_multiplex_write(enum msgcode code, char *buf, size_t len) | |
8d9dc9f9 | 1180 | { |
f89b9368 WD |
1181 | if (!io_multiplexing_out) |
1182 | return 0; | |
8d9dc9f9 | 1183 | |
d17e1dd2 | 1184 | io_flush(NORMAL_FLUSH); |
1b7c47cb | 1185 | stats.total_written += (len+4); |
1f75bb10 | 1186 | mplex_write(code, buf, len); |
8d9dc9f9 AT |
1187 | return 1; |
1188 | } | |
1189 | ||
7f459268 WD |
1190 | void close_multiplexing_in(void) |
1191 | { | |
1192 | io_multiplexing_in = 0; | |
1193 | } | |
1194 | ||
d17e1dd2 | 1195 | /** Stop output multiplexing. */ |
7f459268 | 1196 | void close_multiplexing_out(void) |
554e0a8d AT |
1197 | { |
1198 | io_multiplexing_out = 0; | |
1199 | } | |
1200 | ||
b9f592fb WD |
1201 | void start_write_batch(int fd) |
1202 | { | |
741d6544 WD |
1203 | write_stream_flags(batch_fd); |
1204 | ||
b9f592fb WD |
1205 | /* Some communication has already taken place, but we don't |
1206 | * enable batch writing until here so that we can write a | |
1207 | * canonical record of the communication even though the | |
1208 | * actual communication so far depends on whether a daemon | |
1209 | * is involved. */ | |
1210 | write_int(batch_fd, protocol_version); | |
1211 | write_int(batch_fd, checksum_seed); | |
b9f592fb WD |
1212 | |
1213 | if (am_sender) | |
1214 | write_batch_monitor_out = fd; | |
1215 | else | |
1216 | write_batch_monitor_in = fd; | |
1217 | } | |
1218 | ||
1219 | void stop_write_batch(void) | |
1220 | { | |
1221 | write_batch_monitor_out = -1; | |
1222 | write_batch_monitor_in = -1; | |
1223 | } |