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; | |
e626b29e | 49 | extern int eol_nulls; |
b9f592fb WD |
50 | extern int checksum_seed; |
51 | extern int protocol_version; | |
e626b29e | 52 | extern char *remote_filesfrom_file; |
a800434a | 53 | extern struct stats stats; |
720b47f2 | 54 | |
a86179f4 | 55 | const char phase_unknown[] = "unknown"; |
e626b29e | 56 | int select_timeout = SELECT_TIMEOUT; |
b9f592fb | 57 | int batch_fd = -1; |
805edf9d | 58 | |
98b332ed MP |
59 | /** |
60 | * The connection might be dropped at some point; perhaps because the | |
61 | * remote instance crashed. Just giving the offset on the stream is | |
62 | * not very helpful. So instead we try to make io_phase_name point to | |
63 | * something useful. | |
eca2adb4 | 64 | * |
6ed6d7f5 | 65 | * For buffered/multiplexed I/O these names will be somewhat |
805edf9d | 66 | * approximate; perhaps for ease of support we would rather make the |
6ed6d7f5 | 67 | * buffer always flush when a single application-level I/O finishes. |
805edf9d | 68 | * |
eca2adb4 MP |
69 | * @todo Perhaps we want some simple stack functionality, but there's |
70 | * no need to overdo it. | |
98b332ed | 71 | **/ |
805edf9d MP |
72 | const char *io_write_phase = phase_unknown; |
73 | const char *io_read_phase = phase_unknown; | |
98b332ed | 74 | |
7a55d06e MP |
75 | /** Ignore EOF errors while reading a module listing if the remote |
76 | version is 24 or less. */ | |
77 | int kludge_around_eof = False; | |
78 | ||
d17e1dd2 WD |
79 | int msg_fd_in = -1; |
80 | int msg_fd_out = -1; | |
7a55d06e | 81 | |
1f75bb10 WD |
82 | static int io_multiplexing_out; |
83 | static int io_multiplexing_in; | |
84 | static int sock_f_in = -1; | |
85 | static int sock_f_out = -1; | |
86 | static time_t last_io; | |
87 | static int no_flush; | |
88 | ||
b9f592fb WD |
89 | static int write_batch_monitor_in = -1; |
90 | static int write_batch_monitor_out = -1; | |
91 | ||
56014c8c WD |
92 | static int io_filesfrom_f_in = -1; |
93 | static int io_filesfrom_f_out = -1; | |
94 | static char io_filesfrom_buf[2048]; | |
95 | static char *io_filesfrom_bp; | |
96 | static char io_filesfrom_lastchar; | |
97 | static int io_filesfrom_buflen; | |
720b47f2 | 98 | |
9dd891bb | 99 | static void read_loop(int fd, char *buf, size_t len); |
ff41a59f | 100 | |
d17e1dd2 WD |
101 | struct redo_list { |
102 | struct redo_list *next; | |
103 | int num; | |
104 | }; | |
105 | ||
106 | static struct redo_list *redo_list_head; | |
107 | static struct redo_list *redo_list_tail; | |
108 | ||
109 | struct msg_list { | |
110 | struct msg_list *next; | |
111 | char *buf; | |
112 | int len; | |
113 | }; | |
114 | ||
115 | static struct msg_list *msg_list_head; | |
116 | static struct msg_list *msg_list_tail; | |
117 | ||
118 | static void redo_list_add(int num) | |
119 | { | |
120 | struct redo_list *rl; | |
121 | ||
122 | if (!(rl = new(struct redo_list))) | |
123 | exit_cleanup(RERR_MALLOC); | |
124 | rl->next = NULL; | |
125 | rl->num = num; | |
126 | if (redo_list_tail) | |
127 | redo_list_tail->next = rl; | |
128 | else | |
129 | redo_list_head = rl; | |
130 | redo_list_tail = rl; | |
131 | } | |
132 | ||
8d9dc9f9 AT |
133 | static void check_timeout(void) |
134 | { | |
135 | time_t t; | |
90ba34e2 | 136 | |
d17e1dd2 WD |
137 | if (!io_timeout) |
138 | return; | |
8d9dc9f9 AT |
139 | |
140 | if (!last_io) { | |
141 | last_io = time(NULL); | |
142 | return; | |
143 | } | |
144 | ||
145 | t = time(NULL); | |
146 | ||
1f75bb10 | 147 | if (t - last_io >= io_timeout) { |
0adb99b9 | 148 | if (!am_server && !am_daemon) { |
d62bcc17 | 149 | rprintf(FERROR, "io timeout after %d seconds - exiting\n", |
0adb99b9 AT |
150 | (int)(t-last_io)); |
151 | } | |
65417579 | 152 | exit_cleanup(RERR_TIMEOUT); |
8d9dc9f9 AT |
153 | } |
154 | } | |
155 | ||
1f75bb10 WD |
156 | /* Note the fds used for the main socket (which might really be a pipe |
157 | * for a local transfer, but we can ignore that). */ | |
158 | void io_set_sock_fds(int f_in, int f_out) | |
159 | { | |
160 | sock_f_in = f_in; | |
161 | sock_f_out = f_out; | |
162 | } | |
163 | ||
d17e1dd2 WD |
164 | /** Setup the fd used to receive MSG_* messages. Only needed when |
165 | * we're the generator because the sender and receiver both use the | |
6ed6d7f5 | 166 | * multiplexed I/O setup. */ |
d17e1dd2 WD |
167 | void set_msg_fd_in(int fd) |
168 | { | |
169 | msg_fd_in = fd; | |
170 | } | |
171 | ||
172 | /** Setup the fd used to send our MSG_* messages. Only needed when | |
173 | * we're the receiver because the generator and the sender both use | |
6ed6d7f5 | 174 | * the multiplexed I/O setup. */ |
d17e1dd2 WD |
175 | void set_msg_fd_out(int fd) |
176 | { | |
177 | msg_fd_out = fd; | |
178 | set_nonblocking(msg_fd_out); | |
179 | } | |
180 | ||
181 | /* Add a message to the pending MSG_* list. */ | |
182 | static void msg_list_add(int code, char *buf, int len) | |
554e0a8d | 183 | { |
d17e1dd2 WD |
184 | struct msg_list *ml; |
185 | ||
186 | if (!(ml = new(struct msg_list))) | |
187 | exit_cleanup(RERR_MALLOC); | |
188 | ml->next = NULL; | |
189 | if (!(ml->buf = new_array(char, len+4))) | |
190 | exit_cleanup(RERR_MALLOC); | |
191 | SIVAL(ml->buf, 0, ((code+MPLEX_BASE)<<24) | len); | |
192 | memcpy(ml->buf+4, buf, len); | |
193 | ml->len = len+4; | |
194 | if (msg_list_tail) | |
195 | msg_list_tail->next = ml; | |
196 | else | |
197 | msg_list_head = ml; | |
198 | msg_list_tail = ml; | |
554e0a8d AT |
199 | } |
200 | ||
d17e1dd2 WD |
201 | void send_msg(enum msgcode code, char *buf, int len) |
202 | { | |
203 | msg_list_add(code, buf, len); | |
204 | msg_list_push(NORMAL_FLUSH); | |
205 | } | |
206 | ||
207 | /** Read a message from the MSG_* fd and dispatch it. This is only | |
208 | * called by the generator. */ | |
209 | static void read_msg_fd(void) | |
554e0a8d | 210 | { |
f9c6b3e7 | 211 | char buf[2048]; |
06ce139f | 212 | size_t n; |
d17e1dd2 | 213 | int fd = msg_fd_in; |
ff41a59f AT |
214 | int tag, len; |
215 | ||
00bdf899 WD |
216 | /* Temporarily disable msg_fd_in. This is needed to avoid looping back |
217 | * to this routine from read_timeout() and writefd_unbuffered(). */ | |
d17e1dd2 | 218 | msg_fd_in = -1; |
554e0a8d | 219 | |
ff41a59f AT |
220 | read_loop(fd, buf, 4); |
221 | tag = IVAL(buf, 0); | |
222 | ||
223 | len = tag & 0xFFFFFF; | |
d17e1dd2 | 224 | tag = (tag >> 24) - MPLEX_BASE; |
ff41a59f | 225 | |
d17e1dd2 WD |
226 | switch (tag) { |
227 | case MSG_DONE: | |
13c7bcbb WD |
228 | if (len != 0) { |
229 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); | |
d17e1dd2 | 230 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 231 | } |
d17e1dd2 WD |
232 | redo_list_add(-1); |
233 | break; | |
234 | case MSG_REDO: | |
13c7bcbb WD |
235 | if (len != 4) { |
236 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); | |
d17e1dd2 | 237 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 238 | } |
d17e1dd2 WD |
239 | read_loop(fd, buf, 4); |
240 | redo_list_add(IVAL(buf,0)); | |
241 | break; | |
242 | case MSG_INFO: | |
243 | case MSG_ERROR: | |
244 | case MSG_LOG: | |
245 | while (len) { | |
246 | n = len; | |
247 | if (n >= sizeof buf) | |
248 | n = sizeof buf - 1; | |
249 | read_loop(fd, buf, n); | |
250 | rwrite((enum logcode)tag, buf, n); | |
251 | len -= n; | |
252 | } | |
253 | break; | |
254 | default: | |
13c7bcbb | 255 | rprintf(FERROR, "unknown message %d:%d\n", tag, len); |
d17e1dd2 WD |
256 | exit_cleanup(RERR_STREAMIO); |
257 | } | |
258 | ||
259 | msg_fd_in = fd; | |
260 | } | |
261 | ||
262 | /* Try to push messages off the list onto the wire. If we leave with more | |
263 | * to do, return 0. On error, return -1. If everything flushed, return 1. | |
f9c6b3e7 | 264 | * This is only active in the receiver. */ |
d17e1dd2 WD |
265 | int msg_list_push(int flush_it_all) |
266 | { | |
267 | static int written = 0; | |
268 | struct timeval tv; | |
269 | fd_set fds; | |
270 | ||
271 | if (msg_fd_out < 0) | |
272 | return -1; | |
273 | ||
274 | while (msg_list_head) { | |
275 | struct msg_list *ml = msg_list_head; | |
276 | int n = write(msg_fd_out, ml->buf + written, ml->len - written); | |
277 | if (n < 0) { | |
278 | if (errno == EINTR) | |
279 | continue; | |
280 | if (errno != EWOULDBLOCK && errno != EAGAIN) | |
281 | return -1; | |
282 | if (!flush_it_all) | |
283 | return 0; | |
284 | FD_ZERO(&fds); | |
285 | FD_SET(msg_fd_out, &fds); | |
e626b29e | 286 | tv.tv_sec = select_timeout; |
d17e1dd2 WD |
287 | tv.tv_usec = 0; |
288 | if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv)) | |
289 | check_timeout(); | |
290 | } else if ((written += n) == ml->len) { | |
291 | free(ml->buf); | |
292 | msg_list_head = ml->next; | |
293 | if (!msg_list_head) | |
294 | msg_list_tail = NULL; | |
295 | free(ml); | |
296 | written = 0; | |
297 | } | |
554e0a8d | 298 | } |
d17e1dd2 WD |
299 | return 1; |
300 | } | |
301 | ||
302 | int get_redo_num(void) | |
303 | { | |
304 | struct redo_list *next; | |
305 | int num; | |
306 | ||
307 | while (!redo_list_head) | |
308 | read_msg_fd(); | |
554e0a8d | 309 | |
d17e1dd2 WD |
310 | num = redo_list_head->num; |
311 | next = redo_list_head->next; | |
312 | free(redo_list_head); | |
313 | redo_list_head = next; | |
314 | if (!next) | |
315 | redo_list_tail = NULL; | |
316 | ||
317 | return num; | |
554e0a8d AT |
318 | } |
319 | ||
56014c8c WD |
320 | /** |
321 | * When we're the receiver and we have a local --files-from list of names | |
322 | * that needs to be sent over the socket to the sender, we have to do two | |
323 | * things at the same time: send the sender a list of what files we're | |
324 | * processing and read the incoming file+info list from the sender. We do | |
325 | * this by augmenting the read_timeout() function to copy this data. It | |
326 | * uses the io_filesfrom_buf to read a block of data from f_in (when it is | |
327 | * ready, since it might be a pipe) and then blast it out f_out (when it | |
328 | * is ready to receive more data). | |
329 | */ | |
330 | void io_set_filesfrom_fds(int f_in, int f_out) | |
331 | { | |
332 | io_filesfrom_f_in = f_in; | |
333 | io_filesfrom_f_out = f_out; | |
334 | io_filesfrom_bp = io_filesfrom_buf; | |
335 | io_filesfrom_lastchar = '\0'; | |
336 | io_filesfrom_buflen = 0; | |
337 | } | |
720b47f2 | 338 | |
880da007 MP |
339 | /** |
340 | * It's almost always an error to get an EOF when we're trying to read | |
341 | * from the network, because the protocol is self-terminating. | |
342 | * | |
343 | * However, there is one unfortunate cases where it is not, which is | |
344 | * rsync <2.4.6 sending a list of modules on a server, since the list | |
345 | * is terminated by closing the socket. So, for the section of the | |
346 | * program where that is a problem (start_socket_client), | |
347 | * kludge_around_eof is True and we just exit. | |
348 | */ | |
1f75bb10 | 349 | static void whine_about_eof(int fd) |
7a55d06e | 350 | { |
1f75bb10 | 351 | if (kludge_around_eof && fd == sock_f_in) |
3151cbae | 352 | exit_cleanup(0); |
3151cbae | 353 | |
00bdf899 WD |
354 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
355 | "(%.0f bytes read so far)\n", | |
356 | (double)stats.total_read); | |
357 | ||
358 | exit_cleanup(RERR_STREAMIO); | |
7a55d06e | 359 | } |
720b47f2 | 360 | |
7a55d06e | 361 | |
880da007 | 362 | /** |
6ed6d7f5 | 363 | * Read from a socket with I/O timeout. return the number of bytes |
c3563c46 MP |
364 | * read. If no bytes can be read then exit, never return a number <= 0. |
365 | * | |
8886f8d0 MP |
366 | * TODO: If the remote shell connection fails, then current versions |
367 | * actually report an "unexpected EOF" error here. Since it's a | |
368 | * fairly common mistake to try to use rsh when ssh is required, we | |
369 | * should trap that: if we fail to read any data at all, we should | |
370 | * give a better explanation. We can tell whether the connection has | |
371 | * started by looking e.g. at whether the remote version is known yet. | |
c3563c46 | 372 | */ |
3151cbae | 373 | static int read_timeout(int fd, char *buf, size_t len) |
8d9dc9f9 | 374 | { |
d62bcc17 | 375 | int n, ret = 0; |
4c36ddbe | 376 | |
d17e1dd2 | 377 | io_flush(NORMAL_FLUSH); |
ea2111d1 | 378 | |
4c36ddbe | 379 | while (ret == 0) { |
7a55d06e | 380 | /* until we manage to read *something* */ |
56014c8c | 381 | fd_set r_fds, w_fds; |
4c36ddbe | 382 | struct timeval tv; |
1ea087a7 | 383 | int maxfd = fd; |
a57873b7 | 384 | int count; |
4c36ddbe | 385 | |
56014c8c | 386 | FD_ZERO(&r_fds); |
a7026ba9 | 387 | FD_ZERO(&w_fds); |
56014c8c | 388 | FD_SET(fd, &r_fds); |
d17e1dd2 WD |
389 | if (msg_fd_in >= 0) { |
390 | FD_SET(msg_fd_in, &r_fds); | |
1ea087a7 WD |
391 | if (msg_fd_in > maxfd) |
392 | maxfd = msg_fd_in; | |
4033b80b WD |
393 | } else if (msg_list_head) { |
394 | FD_SET(msg_fd_out, &w_fds); | |
1ea087a7 WD |
395 | if (msg_fd_out > maxfd) |
396 | maxfd = msg_fd_out; | |
56014c8c | 397 | } |
3309507d | 398 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
399 | int new_fd; |
400 | if (io_filesfrom_buflen == 0) { | |
3309507d | 401 | if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
402 | FD_SET(io_filesfrom_f_in, &r_fds); |
403 | new_fd = io_filesfrom_f_in; | |
404 | } else { | |
405 | io_filesfrom_f_out = -1; | |
406 | new_fd = -1; | |
407 | } | |
408 | } else { | |
56014c8c WD |
409 | FD_SET(io_filesfrom_f_out, &w_fds); |
410 | new_fd = io_filesfrom_f_out; | |
411 | } | |
1ea087a7 WD |
412 | if (new_fd > maxfd) |
413 | maxfd = new_fd; | |
554e0a8d AT |
414 | } |
415 | ||
e626b29e | 416 | tv.tv_sec = select_timeout; |
4c36ddbe AT |
417 | tv.tv_usec = 0; |
418 | ||
554e0a8d AT |
419 | errno = 0; |
420 | ||
a7026ba9 | 421 | count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); |
a57873b7 | 422 | |
a57873b7 | 423 | if (count <= 0) { |
f89b9368 | 424 | if (errno == EBADF) |
554e0a8d | 425 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 426 | check_timeout(); |
4c36ddbe AT |
427 | continue; |
428 | } | |
429 | ||
d17e1dd2 WD |
430 | if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds)) |
431 | read_msg_fd(); | |
4033b80b WD |
432 | else if (msg_list_head && FD_ISSET(msg_fd_out, &w_fds)) |
433 | msg_list_push(NORMAL_FLUSH); | |
554e0a8d | 434 | |
3309507d | 435 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
436 | if (io_filesfrom_buflen) { |
437 | if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { | |
438 | int l = write(io_filesfrom_f_out, | |
439 | io_filesfrom_bp, | |
440 | io_filesfrom_buflen); | |
441 | if (l > 0) { | |
442 | if (!(io_filesfrom_buflen -= l)) | |
443 | io_filesfrom_bp = io_filesfrom_buf; | |
444 | else | |
445 | io_filesfrom_bp += l; | |
446 | } else { | |
447 | /* XXX should we complain? */ | |
448 | io_filesfrom_f_out = -1; | |
449 | } | |
450 | } | |
3309507d | 451 | } else if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
452 | if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { |
453 | int l = read(io_filesfrom_f_in, | |
454 | io_filesfrom_buf, | |
455 | sizeof io_filesfrom_buf); | |
456 | if (l <= 0) { | |
457 | /* Send end-of-file marker */ | |
458 | io_filesfrom_buf[0] = '\0'; | |
459 | io_filesfrom_buf[1] = '\0'; | |
460 | io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1; | |
461 | io_filesfrom_f_in = -1; | |
462 | } else { | |
56014c8c WD |
463 | if (!eol_nulls) { |
464 | char *s = io_filesfrom_buf + l; | |
465 | /* Transform CR and/or LF into '\0' */ | |
466 | while (s-- > io_filesfrom_buf) { | |
467 | if (*s == '\n' || *s == '\r') | |
468 | *s = '\0'; | |
469 | } | |
470 | } | |
471 | if (!io_filesfrom_lastchar) { | |
472 | /* Last buf ended with a '\0', so don't | |
473 | * let this buf start with one. */ | |
474 | while (l && !*io_filesfrom_bp) | |
475 | io_filesfrom_bp++, l--; | |
476 | } | |
477 | if (!l) | |
478 | io_filesfrom_bp = io_filesfrom_buf; | |
479 | else { | |
480 | char *f = io_filesfrom_bp; | |
481 | char *t = f; | |
482 | char *eob = f + l; | |
483 | /* Eliminate any multi-'\0' runs. */ | |
484 | while (f != eob) { | |
485 | if (!(*t++ = *f++)) { | |
486 | while (f != eob && !*f) | |
487 | f++, l--; | |
488 | } | |
489 | } | |
490 | io_filesfrom_lastchar = f[-1]; | |
491 | } | |
492 | io_filesfrom_buflen = l; | |
493 | } | |
494 | } | |
495 | } | |
496 | } | |
497 | ||
f89b9368 WD |
498 | if (!FD_ISSET(fd, &r_fds)) |
499 | continue; | |
554e0a8d | 500 | |
4c36ddbe AT |
501 | n = read(fd, buf, len); |
502 | ||
1ea087a7 WD |
503 | if (n <= 0) { |
504 | if (n == 0) | |
1f75bb10 | 505 | whine_about_eof(fd); /* Doesn't return. */ |
d62bcc17 WD |
506 | if (errno == EINTR || errno == EWOULDBLOCK |
507 | || errno == EAGAIN) | |
7a55d06e | 508 | continue; |
1f75bb10 WD |
509 | |
510 | /* Don't write errors on a dead socket. */ | |
511 | if (fd == sock_f_in) | |
512 | io_multiplexing_close(); | |
513 | rsyserr(FERROR, errno, "read error"); | |
514 | exit_cleanup(RERR_STREAMIO); | |
8d9dc9f9 | 515 | } |
00bdf899 WD |
516 | |
517 | buf += n; | |
518 | len -= n; | |
519 | ret += n; | |
1f75bb10 WD |
520 | |
521 | if (io_timeout && fd == sock_f_in) | |
00bdf899 | 522 | last_io = time(NULL); |
4c36ddbe | 523 | } |
8d9dc9f9 | 524 | |
4c36ddbe AT |
525 | return ret; |
526 | } | |
8d9dc9f9 | 527 | |
56014c8c WD |
528 | /** |
529 | * Read a line into the "fname" buffer (which must be at least MAXPATHLEN | |
530 | * characters long). | |
531 | */ | |
532 | int read_filesfrom_line(int fd, char *fname) | |
533 | { | |
534 | char ch, *s, *eob = fname + MAXPATHLEN - 1; | |
535 | int cnt; | |
55d5937d | 536 | int reading_remotely = remote_filesfrom_file != NULL; |
56014c8c WD |
537 | int nulls = eol_nulls || reading_remotely; |
538 | ||
539 | start: | |
540 | s = fname; | |
541 | while (1) { | |
542 | cnt = read(fd, &ch, 1); | |
543 | if (cnt < 0 && (errno == EWOULDBLOCK | |
544 | || errno == EINTR || errno == EAGAIN)) { | |
545 | struct timeval tv; | |
546 | fd_set fds; | |
547 | FD_ZERO(&fds); | |
548 | FD_SET(fd, &fds); | |
e626b29e | 549 | tv.tv_sec = select_timeout; |
56014c8c WD |
550 | tv.tv_usec = 0; |
551 | if (!select(fd+1, &fds, NULL, NULL, &tv)) | |
552 | check_timeout(); | |
553 | continue; | |
554 | } | |
555 | if (cnt != 1) | |
556 | break; | |
557 | if (nulls? !ch : (ch == '\r' || ch == '\n')) { | |
558 | /* Skip empty lines if reading locally. */ | |
559 | if (!reading_remotely && s == fname) | |
560 | continue; | |
561 | break; | |
562 | } | |
563 | if (s < eob) | |
564 | *s++ = ch; | |
565 | } | |
566 | *s = '\0'; | |
7a55d06e | 567 | |
6b45fcf1 WD |
568 | /* Dump comments. */ |
569 | if (*fname == '#' || *fname == ';') | |
56014c8c WD |
570 | goto start; |
571 | ||
572 | return s - fname; | |
573 | } | |
7a55d06e MP |
574 | |
575 | ||
1f75bb10 WD |
576 | static char *iobuf_out; |
577 | static int iobuf_out_cnt; | |
578 | ||
579 | void io_start_buffering_out(void) | |
580 | { | |
581 | if (iobuf_out) | |
582 | return; | |
583 | if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) | |
584 | out_of_memory("io_start_buffering_out"); | |
585 | iobuf_out_cnt = 0; | |
586 | } | |
587 | ||
588 | ||
589 | static char *iobuf_in; | |
590 | static size_t iobuf_in_siz; | |
591 | ||
592 | void io_start_buffering_in(void) | |
593 | { | |
594 | if (iobuf_in) | |
595 | return; | |
596 | iobuf_in_siz = 2 * IO_BUFFER_SIZE; | |
597 | if (!(iobuf_in = new_array(char, iobuf_in_siz))) | |
598 | out_of_memory("io_start_buffering_in"); | |
599 | } | |
600 | ||
601 | ||
602 | void io_end_buffering(void) | |
603 | { | |
604 | io_flush(NORMAL_FLUSH); | |
605 | if (!io_multiplexing_out) { | |
606 | free(iobuf_out); | |
607 | iobuf_out = NULL; | |
608 | } | |
609 | } | |
610 | ||
611 | ||
880da007 MP |
612 | /** |
613 | * Continue trying to read len bytes - don't return until len has been | |
614 | * read. | |
615 | **/ | |
3151cbae | 616 | static void read_loop(int fd, char *buf, size_t len) |
4c36ddbe AT |
617 | { |
618 | while (len) { | |
619 | int n = read_timeout(fd, buf, len); | |
620 | ||
621 | buf += n; | |
622 | len -= n; | |
8d9dc9f9 AT |
623 | } |
624 | } | |
625 | ||
7a55d06e MP |
626 | |
627 | /** | |
628 | * Read from the file descriptor handling multiplexing - return number | |
629 | * of bytes read. | |
d62bcc17 WD |
630 | * |
631 | * Never returns <= 0. | |
7a55d06e | 632 | */ |
c399d22a | 633 | static int readfd_unbuffered(int fd, char *buf, size_t len) |
8d9dc9f9 | 634 | { |
6fe25398 | 635 | static size_t remaining; |
1f75bb10 | 636 | static size_t iobuf_in_ndx; |
909ce14f | 637 | int tag, ret = 0; |
8d9dc9f9 AT |
638 | char line[1024]; |
639 | ||
1f75bb10 | 640 | if (!iobuf_in || fd != sock_f_in) |
4c36ddbe | 641 | return read_timeout(fd, buf, len); |
8d9dc9f9 | 642 | |
76c21947 | 643 | if (!io_multiplexing_in && remaining == 0) { |
1f75bb10 WD |
644 | remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); |
645 | iobuf_in_ndx = 0; | |
76c21947 WD |
646 | } |
647 | ||
8d9dc9f9 AT |
648 | while (ret == 0) { |
649 | if (remaining) { | |
650 | len = MIN(len, remaining); | |
1f75bb10 WD |
651 | memcpy(buf, iobuf_in + iobuf_in_ndx, len); |
652 | iobuf_in_ndx += len; | |
8d9dc9f9 AT |
653 | remaining -= len; |
654 | ret = len; | |
76c21947 | 655 | break; |
8d9dc9f9 AT |
656 | } |
657 | ||
909ce14f | 658 | read_loop(fd, line, 4); |
ff41a59f | 659 | tag = IVAL(line, 0); |
679e7657 | 660 | |
8d9dc9f9 | 661 | remaining = tag & 0xFFFFFF; |
d17e1dd2 | 662 | tag = (tag >> 24) - MPLEX_BASE; |
8d9dc9f9 | 663 | |
d17e1dd2 WD |
664 | switch (tag) { |
665 | case MSG_DATA: | |
1f75bb10 WD |
666 | if (remaining > iobuf_in_siz) { |
667 | if (!(iobuf_in = realloc_array(iobuf_in, char, | |
668 | remaining))) | |
c399d22a | 669 | out_of_memory("readfd_unbuffered"); |
1f75bb10 | 670 | iobuf_in_siz = remaining; |
76c21947 | 671 | } |
1f75bb10 WD |
672 | read_loop(fd, iobuf_in, remaining); |
673 | iobuf_in_ndx = 0; | |
d17e1dd2 WD |
674 | break; |
675 | case MSG_INFO: | |
676 | case MSG_ERROR: | |
677 | if (remaining >= sizeof line) { | |
678 | rprintf(FERROR, "multiplexing overflow %d:%ld\n\n", | |
679 | tag, (long)remaining); | |
680 | exit_cleanup(RERR_STREAMIO); | |
681 | } | |
682 | read_loop(fd, line, remaining); | |
683 | rwrite((enum logcode)tag, line, remaining); | |
684 | remaining = 0; | |
685 | break; | |
686 | default: | |
909ce14f | 687 | rprintf(FERROR, "unexpected tag %d\n", tag); |
65417579 | 688 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 689 | } |
8d9dc9f9 AT |
690 | } |
691 | ||
76c21947 | 692 | if (remaining == 0) |
d17e1dd2 | 693 | io_flush(NORMAL_FLUSH); |
76c21947 | 694 | |
8d9dc9f9 AT |
695 | return ret; |
696 | } | |
697 | ||
698 | ||
909ce14f | 699 | |
880da007 MP |
700 | /** |
701 | * Do a buffered read from @p fd. Don't return until all @p n bytes | |
702 | * have been read. If all @p n can't be read then exit with an | |
703 | * error. | |
704 | **/ | |
3151cbae | 705 | static void readfd(int fd, char *buffer, size_t N) |
720b47f2 | 706 | { |
6ba9279f | 707 | int ret; |
d62bcc17 | 708 | size_t total = 0; |
3151cbae | 709 | |
6ba9279f | 710 | while (total < N) { |
c399d22a | 711 | ret = readfd_unbuffered(fd, buffer + total, N-total); |
6ba9279f | 712 | total += ret; |
7f28dbee | 713 | } |
1b7c47cb | 714 | |
b9f592fb WD |
715 | if (fd == write_batch_monitor_in) { |
716 | if ((size_t)write(batch_fd, buffer, total) != total) | |
717 | exit_cleanup(RERR_FILEIO); | |
718 | } | |
1f75bb10 WD |
719 | |
720 | if (fd == sock_f_in) | |
721 | stats.total_read += total; | |
720b47f2 AT |
722 | } |
723 | ||
724 | ||
b7922338 | 725 | int32 read_int(int f) |
720b47f2 | 726 | { |
4c36ddbe | 727 | char b[4]; |
d730b113 AT |
728 | int32 ret; |
729 | ||
4c36ddbe | 730 | readfd(f,b,4); |
d730b113 | 731 | ret = IVAL(b,0); |
f89b9368 WD |
732 | if (ret == (int32)0xffffffff) |
733 | return -1; | |
d730b113 | 734 | return ret; |
720b47f2 AT |
735 | } |
736 | ||
71c46176 | 737 | int64 read_longint(int f) |
3a6a366f | 738 | { |
71c46176 | 739 | int64 ret; |
3a6a366f AT |
740 | char b[8]; |
741 | ret = read_int(f); | |
71c46176 | 742 | |
f89b9368 | 743 | if ((int32)ret != (int32)0xffffffff) |
8de330a3 | 744 | return ret; |
71c46176 | 745 | |
3bee6733 | 746 | #ifdef NO_INT64 |
9486289c | 747 | rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n"); |
65417579 | 748 | exit_cleanup(RERR_UNSUPPORTED); |
71c46176 | 749 | #else |
91c4da3f S |
750 | readfd(f,b,8); |
751 | ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); | |
71c46176 AT |
752 | #endif |
753 | ||
3a6a366f AT |
754 | return ret; |
755 | } | |
756 | ||
9dd891bb | 757 | void read_buf(int f,char *buf,size_t len) |
720b47f2 | 758 | { |
4c36ddbe | 759 | readfd(f,buf,len); |
720b47f2 AT |
760 | } |
761 | ||
9dd891bb | 762 | void read_sbuf(int f,char *buf,size_t len) |
575f2fca | 763 | { |
93095cbe | 764 | readfd(f, buf, len); |
575f2fca AT |
765 | buf[len] = 0; |
766 | } | |
767 | ||
182dca5c AT |
768 | unsigned char read_byte(int f) |
769 | { | |
4c36ddbe | 770 | unsigned char c; |
93095cbe | 771 | readfd(f, (char *)&c, 1); |
4c36ddbe | 772 | return c; |
182dca5c | 773 | } |
720b47f2 | 774 | |
880da007 | 775 | |
08571358 MP |
776 | /** |
777 | * Sleep after writing to limit I/O bandwidth usage. | |
778 | * | |
779 | * @todo Rather than sleeping after each write, it might be better to | |
780 | * use some kind of averaging. The current algorithm seems to always | |
781 | * use a bit less bandwidth than specified, because it doesn't make up | |
782 | * for slow periods. But arguably this is a feature. In addition, we | |
783 | * ought to take the time used to write the data into account. | |
71e58630 WD |
784 | * |
785 | * During some phases of big transfers (file FOO is uptodate) this is | |
786 | * called with a small bytes_written every time. As the kernel has to | |
787 | * round small waits up to guarantee that we actually wait at least the | |
788 | * requested number of microseconds, this can become grossly inaccurate. | |
789 | * We therefore keep track of the bytes we've written over time and only | |
790 | * sleep when the accumulated delay is at least 1 tenth of a second. | |
08571358 MP |
791 | **/ |
792 | static void sleep_for_bwlimit(int bytes_written) | |
793 | { | |
71e58630 WD |
794 | static struct timeval prior_tv; |
795 | static long total_written = 0; | |
796 | struct timeval tv, start_tv; | |
797 | long elapsed_usec, sleep_usec; | |
798 | ||
799 | #define ONE_SEC 1000000L /* # of microseconds in a second */ | |
08571358 MP |
800 | |
801 | if (!bwlimit) | |
802 | return; | |
e681e820 | 803 | |
71e58630 WD |
804 | total_written += bytes_written; |
805 | ||
806 | gettimeofday(&start_tv, NULL); | |
807 | if (prior_tv.tv_sec) { | |
808 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC | |
809 | + (start_tv.tv_usec - prior_tv.tv_usec); | |
810 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); | |
811 | if (total_written < 0) | |
812 | total_written = 0; | |
813 | } | |
3151cbae | 814 | |
71e58630 WD |
815 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
816 | if (sleep_usec < ONE_SEC / 10) { | |
817 | prior_tv = start_tv; | |
818 | return; | |
819 | } | |
08571358 | 820 | |
71e58630 WD |
821 | tv.tv_sec = sleep_usec / ONE_SEC; |
822 | tv.tv_usec = sleep_usec % ONE_SEC; | |
98b332ed | 823 | select(0, NULL, NULL, NULL, &tv); |
71e58630 WD |
824 | |
825 | gettimeofday(&prior_tv, NULL); | |
826 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC | |
827 | + (prior_tv.tv_usec - start_tv.tv_usec); | |
828 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); | |
08571358 MP |
829 | } |
830 | ||
831 | ||
1f75bb10 WD |
832 | /* Write len bytes to the file descriptor fd, looping as necessary to get |
833 | * the job done and also (in the generator) reading any data on msg_fd_in | |
834 | * (to avoid deadlock). | |
880da007 MP |
835 | * |
836 | * This function underlies the multiplexing system. The body of the | |
1f75bb10 | 837 | * application never calls this function directly. */ |
9dd891bb | 838 | static void writefd_unbuffered(int fd,char *buf,size_t len) |
720b47f2 | 839 | { |
1ea087a7 | 840 | size_t n, total = 0; |
8d9dc9f9 | 841 | fd_set w_fds, r_fds; |
1ea087a7 | 842 | int maxfd, count, ret; |
8d9dc9f9 | 843 | struct timeval tv; |
720b47f2 | 844 | |
e44f9a12 AT |
845 | no_flush++; |
846 | ||
4c36ddbe | 847 | while (total < len) { |
8d9dc9f9 | 848 | FD_ZERO(&w_fds); |
8d9dc9f9 | 849 | FD_SET(fd,&w_fds); |
1ea087a7 | 850 | maxfd = fd; |
4c36ddbe | 851 | |
d17e1dd2 | 852 | if (msg_fd_in >= 0) { |
56014c8c | 853 | FD_ZERO(&r_fds); |
d17e1dd2 | 854 | FD_SET(msg_fd_in,&r_fds); |
1ea087a7 WD |
855 | if (msg_fd_in > maxfd) |
856 | maxfd = msg_fd_in; | |
8d9dc9f9 AT |
857 | } |
858 | ||
e626b29e | 859 | tv.tv_sec = select_timeout; |
8d9dc9f9 | 860 | tv.tv_usec = 0; |
4c36ddbe | 861 | |
554e0a8d | 862 | errno = 0; |
1ea087a7 | 863 | count = select(maxfd + 1, msg_fd_in >= 0 ? &r_fds : NULL, |
d17e1dd2 | 864 | &w_fds, NULL, &tv); |
4c36ddbe AT |
865 | |
866 | if (count <= 0) { | |
1ea087a7 | 867 | if (count < 0 && errno == EBADF) |
554e0a8d | 868 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 869 | check_timeout(); |
8d9dc9f9 AT |
870 | continue; |
871 | } | |
4c36ddbe | 872 | |
d17e1dd2 WD |
873 | if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds)) |
874 | read_msg_fd(); | |
554e0a8d | 875 | |
1ea087a7 WD |
876 | if (!FD_ISSET(fd, &w_fds)) |
877 | continue; | |
4c36ddbe | 878 | |
1ea087a7 WD |
879 | n = len - total; |
880 | if (bwlimit && n > bwlimit_writemax) | |
881 | n = bwlimit_writemax; | |
882 | ret = write(fd, buf + total, n); | |
883 | ||
884 | if (ret <= 0) { | |
3309507d WD |
885 | if (ret < 0) { |
886 | if (errno == EINTR) | |
887 | continue; | |
888 | if (errno == EWOULDBLOCK || errno == EAGAIN) { | |
889 | msleep(1); | |
890 | continue; | |
891 | } | |
f0359dd0 AT |
892 | } |
893 | ||
1ea087a7 | 894 | /* Don't try to write errors back across the stream. */ |
1f75bb10 WD |
895 | if (fd == sock_f_out) |
896 | io_multiplexing_close(); | |
1ea087a7 WD |
897 | rsyserr(FERROR, errno, |
898 | "writefd_unbuffered failed to write %ld bytes: phase \"%s\"", | |
899 | (long)len, io_write_phase); | |
900 | exit_cleanup(RERR_STREAMIO); | |
901 | } | |
4c36ddbe | 902 | |
1ea087a7 | 903 | total += ret; |
a800434a | 904 | |
1f75bb10 WD |
905 | if (fd == sock_f_out) { |
906 | if (io_timeout) | |
907 | last_io = time(NULL); | |
908 | sleep_for_bwlimit(ret); | |
909 | } | |
4c36ddbe | 910 | } |
e44f9a12 AT |
911 | |
912 | no_flush--; | |
720b47f2 AT |
913 | } |
914 | ||
8d9dc9f9 | 915 | |
880da007 MP |
916 | /** |
917 | * Write an message to a multiplexed stream. If this fails then rsync | |
918 | * exits. | |
919 | **/ | |
1f75bb10 | 920 | static void mplex_write(enum msgcode code, char *buf, size_t len) |
ff41a59f AT |
921 | { |
922 | char buffer[4096]; | |
06ce139f | 923 | size_t n = len; |
8d9dc9f9 | 924 | |
ff41a59f AT |
925 | SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); |
926 | ||
c399d22a | 927 | if (n > sizeof buffer - 4) |
3151cbae | 928 | n = sizeof buffer - 4; |
ff41a59f AT |
929 | |
930 | memcpy(&buffer[4], buf, n); | |
1f75bb10 | 931 | writefd_unbuffered(sock_f_out, buffer, n+4); |
ff41a59f AT |
932 | |
933 | len -= n; | |
934 | buf += n; | |
935 | ||
1ea087a7 | 936 | if (len) |
1f75bb10 | 937 | writefd_unbuffered(sock_f_out, buf, len); |
d6dead6b AT |
938 | } |
939 | ||
ff41a59f | 940 | |
d17e1dd2 | 941 | void io_flush(int flush_it_all) |
d6dead6b | 942 | { |
d17e1dd2 | 943 | msg_list_push(flush_it_all); |
90ba34e2 | 944 | |
1f75bb10 | 945 | if (!iobuf_out_cnt || no_flush) |
d17e1dd2 | 946 | return; |
8d9dc9f9 | 947 | |
d17e1dd2 | 948 | if (io_multiplexing_out) |
1f75bb10 | 949 | mplex_write(MSG_DATA, iobuf_out, iobuf_out_cnt); |
d17e1dd2 | 950 | else |
1f75bb10 WD |
951 | writefd_unbuffered(sock_f_out, iobuf_out, iobuf_out_cnt); |
952 | iobuf_out_cnt = 0; | |
8d9dc9f9 AT |
953 | } |
954 | ||
0ba48136 | 955 | |
9dd891bb | 956 | static void writefd(int fd,char *buf,size_t len) |
d6dead6b | 957 | { |
4033b80b WD |
958 | if (fd == msg_fd_out) { |
959 | rprintf(FERROR, "Internal error: wrong write used in receiver.\n"); | |
960 | exit_cleanup(RERR_PROTOCOL); | |
961 | } | |
90ba34e2 | 962 | |
1f75bb10 WD |
963 | if (fd == sock_f_out) |
964 | stats.total_written += len; | |
965 | ||
b9f592fb WD |
966 | if (fd == write_batch_monitor_out) { |
967 | if ((size_t)write(batch_fd, buf, len) != len) | |
968 | exit_cleanup(RERR_FILEIO); | |
969 | } | |
970 | ||
1f75bb10 | 971 | if (!iobuf_out || fd != sock_f_out) { |
4c36ddbe AT |
972 | writefd_unbuffered(fd, buf, len); |
973 | return; | |
974 | } | |
d6dead6b AT |
975 | |
976 | while (len) { | |
1f75bb10 | 977 | int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt); |
d6dead6b | 978 | if (n > 0) { |
1f75bb10 | 979 | memcpy(iobuf_out+iobuf_out_cnt, buf, n); |
d6dead6b AT |
980 | buf += n; |
981 | len -= n; | |
1f75bb10 | 982 | iobuf_out_cnt += n; |
d6dead6b | 983 | } |
3151cbae | 984 | |
1f75bb10 | 985 | if (iobuf_out_cnt == IO_BUFFER_SIZE) |
d17e1dd2 | 986 | io_flush(NORMAL_FLUSH); |
d6dead6b | 987 | } |
d6dead6b | 988 | } |
720b47f2 AT |
989 | |
990 | ||
b7922338 | 991 | void write_int(int f,int32 x) |
720b47f2 | 992 | { |
8d9dc9f9 AT |
993 | char b[4]; |
994 | SIVAL(b,0,x); | |
4c36ddbe | 995 | writefd(f,b,4); |
720b47f2 AT |
996 | } |
997 | ||
7a24c346 | 998 | |
805edf9d MP |
999 | void write_int_named(int f, int32 x, const char *phase) |
1000 | { | |
1001 | io_write_phase = phase; | |
1002 | write_int(f, x); | |
1003 | io_write_phase = phase_unknown; | |
1004 | } | |
1005 | ||
1006 | ||
7a24c346 MP |
1007 | /* |
1008 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any | |
1009 | * 64-bit types on this platform. | |
1010 | */ | |
71c46176 | 1011 | void write_longint(int f, int64 x) |
3a6a366f | 1012 | { |
3a6a366f | 1013 | char b[8]; |
3a6a366f | 1014 | |
91c4da3f | 1015 | if (x <= 0x7FFFFFFF) { |
3a6a366f AT |
1016 | write_int(f, (int)x); |
1017 | return; | |
1018 | } | |
1019 | ||
67863f46 S |
1020 | #ifdef NO_INT64 |
1021 | rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n"); | |
1022 | exit_cleanup(RERR_UNSUPPORTED); | |
1023 | #else | |
8de330a3 | 1024 | write_int(f, (int32)0xFFFFFFFF); |
3a6a366f AT |
1025 | SIVAL(b,0,(x&0xFFFFFFFF)); |
1026 | SIVAL(b,4,((x>>32)&0xFFFFFFFF)); | |
1027 | ||
4c36ddbe | 1028 | writefd(f,b,8); |
67863f46 | 1029 | #endif |
3a6a366f AT |
1030 | } |
1031 | ||
9dd891bb | 1032 | void write_buf(int f,char *buf,size_t len) |
720b47f2 | 1033 | { |
4c36ddbe | 1034 | writefd(f,buf,len); |
720b47f2 AT |
1035 | } |
1036 | ||
880da007 | 1037 | /** Write a string to the connection */ |
cf338ab1 | 1038 | void write_sbuf(int f, char *buf) |
f0fca04e | 1039 | { |
93095cbe | 1040 | writefd(f, buf, strlen(buf)); |
f0fca04e AT |
1041 | } |
1042 | ||
182dca5c AT |
1043 | void write_byte(int f,unsigned char c) |
1044 | { | |
93095cbe | 1045 | writefd(f, (char *)&c, 1); |
182dca5c AT |
1046 | } |
1047 | ||
7a55d06e MP |
1048 | |
1049 | ||
914cc65c | 1050 | /** |
6ed6d7f5 WD |
1051 | * Read a line of up to @p maxlen characters into @p buf (not counting |
1052 | * the trailing null). Strips the (required) trailing newline and all | |
1053 | * carriage returns. | |
914cc65c | 1054 | * |
6ed6d7f5 | 1055 | * @return 1 for success; 0 for I/O error or truncation. |
914cc65c | 1056 | **/ |
9dd891bb | 1057 | int read_line(int f, char *buf, size_t maxlen) |
f0fca04e AT |
1058 | { |
1059 | while (maxlen) { | |
528bfcd7 | 1060 | buf[0] = 0; |
f0fca04e | 1061 | read_buf(f, buf, 1); |
914cc65c MP |
1062 | if (buf[0] == 0) |
1063 | return 0; | |
6ed6d7f5 | 1064 | if (buf[0] == '\n') |
f0fca04e | 1065 | break; |
f0fca04e AT |
1066 | if (buf[0] != '\r') { |
1067 | buf++; | |
1068 | maxlen--; | |
1069 | } | |
1070 | } | |
6ed6d7f5 WD |
1071 | *buf = '\0'; |
1072 | return maxlen > 0; | |
f0fca04e AT |
1073 | } |
1074 | ||
1075 | ||
1076 | void io_printf(int fd, const char *format, ...) | |
1077 | { | |
d62bcc17 | 1078 | va_list ap; |
f0fca04e AT |
1079 | char buf[1024]; |
1080 | int len; | |
3151cbae | 1081 | |
f0fca04e | 1082 | va_start(ap, format); |
3151cbae | 1083 | len = vsnprintf(buf, sizeof buf, format, ap); |
f0fca04e AT |
1084 | va_end(ap); |
1085 | ||
f89b9368 WD |
1086 | if (len < 0) |
1087 | exit_cleanup(RERR_STREAMIO); | |
f0fca04e AT |
1088 | |
1089 | write_sbuf(fd, buf); | |
1090 | } | |
8d9dc9f9 AT |
1091 | |
1092 | ||
d17e1dd2 | 1093 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1094 | void io_start_multiplex_out(void) |
8d9dc9f9 | 1095 | { |
d17e1dd2 | 1096 | io_flush(NORMAL_FLUSH); |
1f75bb10 | 1097 | io_start_buffering_out(); |
8d9dc9f9 AT |
1098 | io_multiplexing_out = 1; |
1099 | } | |
1100 | ||
d17e1dd2 | 1101 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1102 | void io_start_multiplex_in(void) |
8d9dc9f9 | 1103 | { |
d17e1dd2 | 1104 | io_flush(NORMAL_FLUSH); |
1f75bb10 | 1105 | io_start_buffering_in(); |
8d9dc9f9 AT |
1106 | io_multiplexing_in = 1; |
1107 | } | |
1108 | ||
d17e1dd2 WD |
1109 | /** Write an message to the multiplexed data stream. */ |
1110 | int io_multiplex_write(enum msgcode code, char *buf, size_t len) | |
8d9dc9f9 | 1111 | { |
f89b9368 WD |
1112 | if (!io_multiplexing_out) |
1113 | return 0; | |
8d9dc9f9 | 1114 | |
d17e1dd2 | 1115 | io_flush(NORMAL_FLUSH); |
1b7c47cb | 1116 | stats.total_written += (len+4); |
1f75bb10 | 1117 | mplex_write(code, buf, len); |
8d9dc9f9 AT |
1118 | return 1; |
1119 | } | |
1120 | ||
d17e1dd2 | 1121 | /** Stop output multiplexing. */ |
554e0a8d AT |
1122 | void io_multiplexing_close(void) |
1123 | { | |
1124 | io_multiplexing_out = 0; | |
1125 | } | |
1126 | ||
b9f592fb WD |
1127 | void start_write_batch(int fd) |
1128 | { | |
1129 | /* Some communication has already taken place, but we don't | |
1130 | * enable batch writing until here so that we can write a | |
1131 | * canonical record of the communication even though the | |
1132 | * actual communication so far depends on whether a daemon | |
1133 | * is involved. */ | |
1134 | write_int(batch_fd, protocol_version); | |
1135 | write_int(batch_fd, checksum_seed); | |
b9f592fb WD |
1136 | |
1137 | if (am_sender) | |
1138 | write_batch_monitor_out = fd; | |
1139 | else | |
1140 | write_batch_monitor_in = fd; | |
1141 | } | |
1142 | ||
1143 | void stop_write_batch(void) | |
1144 | { | |
1145 | write_batch_monitor_out = -1; | |
1146 | write_batch_monitor_in = -1; | |
1147 | } |