Commit | Line | Data |
---|---|---|
0f78b815 WD |
1 | /* |
2 | * Socket and pipe I/O utilities used in rsync. | |
d62bcc17 | 3 | * |
0f78b815 WD |
4 | * Copyright (C) 1996-2001 Andrew Tridgell |
5 | * Copyright (C) 1996 Paul Mackerras | |
6 | * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org> | |
ba2133d6 | 7 | * Copyright (C) 2003-2007 Wayne Davison |
d62bcc17 | 8 | * |
880da007 | 9 | * This program is free software; you can redistribute it and/or modify |
ba2133d6 WD |
10 | * it under the terms of the GNU General Public License version 2 as |
11 | * published by the Free Software Foundation. | |
d62bcc17 | 12 | * |
880da007 MP |
13 | * This program is distributed in the hope that it will be useful, |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
d62bcc17 | 17 | * |
e7c67065 WD |
18 | * You should have received a copy of the GNU General Public License along |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
880da007 | 21 | */ |
720b47f2 | 22 | |
0f78b815 WD |
23 | /* Rsync provides its own multiplexing system, which is used to send |
24 | * stderr and stdout over a single socket. | |
87ee2481 MP |
25 | * |
26 | * For historical reasons this is off during the start of the | |
27 | * connection, but it's switched on quite early using | |
0f78b815 | 28 | * io_start_multiplex_out() and io_start_multiplex_in(). */ |
720b47f2 | 29 | |
720b47f2 AT |
30 | #include "rsync.h" |
31 | ||
880da007 | 32 | /** If no timeout is specified then use a 60 second select timeout */ |
8cd9fd4e AT |
33 | #define SELECT_TIMEOUT 60 |
34 | ||
7a55d06e | 35 | extern int bwlimit; |
71e58630 | 36 | extern size_t bwlimit_writemax; |
6ba9279f | 37 | extern int io_timeout; |
cdf236aa | 38 | extern int allowed_lull; |
d17e1dd2 WD |
39 | extern int am_server; |
40 | extern int am_daemon; | |
41 | extern int am_sender; | |
98f8c9a5 | 42 | extern int am_generator; |
3ea6e0e7 | 43 | extern int inc_recurse; |
8ef246e0 | 44 | extern int io_error; |
e626b29e | 45 | extern int eol_nulls; |
8ef246e0 | 46 | extern int flist_eof; |
3b0a30eb | 47 | extern int read_batch; |
188fed95 | 48 | extern int csum_length; |
b9f592fb WD |
49 | extern int checksum_seed; |
50 | extern int protocol_version; | |
47c11975 | 51 | extern int remove_source_files; |
cdf236aa | 52 | extern int preserve_hard_links; |
d19320fd | 53 | extern char *filesfrom_host; |
a800434a | 54 | extern struct stats stats; |
8ef246e0 | 55 | extern struct file_list *cur_flist, *first_flist; |
720b47f2 | 56 | |
a86179f4 | 57 | const char phase_unknown[] = "unknown"; |
9e2409ab | 58 | int ignore_timeout = 0; |
b9f592fb | 59 | int batch_fd = -1; |
04c722d5 | 60 | int msgdone_cnt = 0; |
805edf9d | 61 | |
cb2e1f18 | 62 | /* Ignore an EOF error if non-zero. See whine_about_eof(). */ |
574c2500 | 63 | int kluge_around_eof = 0; |
7a55d06e | 64 | |
d17e1dd2 WD |
65 | int msg_fd_in = -1; |
66 | int msg_fd_out = -1; | |
cdf236aa WD |
67 | int sock_f_in = -1; |
68 | int sock_f_out = -1; | |
7a55d06e | 69 | |
8ef246e0 WD |
70 | static int iobuf_f_in = -1; |
71 | static char *iobuf_in; | |
72 | static size_t iobuf_in_siz; | |
73 | static size_t iobuf_in_ndx; | |
74 | static size_t iobuf_in_remaining; | |
75 | ||
76 | static int iobuf_f_out = -1; | |
77 | static char *iobuf_out; | |
78 | static int iobuf_out_cnt; | |
79 | ||
80 | int flist_forward_from = -1; | |
81 | ||
1f75bb10 WD |
82 | static int io_multiplexing_out; |
83 | static int io_multiplexing_in; | |
3b0a30eb WD |
84 | static time_t last_io_in; |
85 | static time_t last_io_out; | |
1f75bb10 WD |
86 | static int no_flush; |
87 | ||
b9f592fb WD |
88 | static int write_batch_monitor_in = -1; |
89 | static int write_batch_monitor_out = -1; | |
90 | ||
56014c8c WD |
91 | static int io_filesfrom_f_in = -1; |
92 | static int io_filesfrom_f_out = -1; | |
93 | static char io_filesfrom_buf[2048]; | |
94 | static char *io_filesfrom_bp; | |
95 | static char io_filesfrom_lastchar; | |
96 | static int io_filesfrom_buflen; | |
954bbed8 | 97 | static int defer_forwarding_messages = 0; |
3b0a30eb | 98 | static int select_timeout = SELECT_TIMEOUT; |
d6081c82 WD |
99 | static int active_filecnt = 0; |
100 | static OFF_T active_bytecnt = 0; | |
720b47f2 | 101 | |
351e23ad WD |
102 | static char int_byte_extra[64] = { |
103 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (00 - 3F)/4 */ | |
104 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (40 - 7F)/4 */ | |
105 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* (80 - BF)/4 */ | |
106 | 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6, /* (C0 - FF)/4 */ | |
482f48cc WD |
107 | }; |
108 | ||
dde5b772 | 109 | static void readfd(int fd, char *buffer, size_t N); |
8ef246e0 WD |
110 | static void writefd(int fd, const char *buf, size_t len); |
111 | static void writefd_unbuffered(int fd, const char *buf, size_t len); | |
112 | static void decrement_active_files(int ndx); | |
113 | static void decrement_flist_in_progress(int ndx, int redo); | |
ff41a59f | 114 | |
c6816b94 WD |
115 | struct flist_ndx_item { |
116 | struct flist_ndx_item *next; | |
117 | int ndx; | |
d17e1dd2 WD |
118 | }; |
119 | ||
c6816b94 WD |
120 | struct flist_ndx_list { |
121 | struct flist_ndx_item *head, *tail; | |
122 | }; | |
123 | ||
cdf236aa | 124 | static struct flist_ndx_list redo_list, hlink_list; |
d17e1dd2 | 125 | |
08c88178 WD |
126 | struct msg_list_item { |
127 | struct msg_list_item *next; | |
d17e1dd2 | 128 | int len; |
954bbed8 | 129 | char buf[1]; |
d17e1dd2 WD |
130 | }; |
131 | ||
08c88178 WD |
132 | struct msg_list { |
133 | struct msg_list_item *head, *tail; | |
134 | }; | |
135 | ||
e4c877cf | 136 | static struct msg_list msg_queue; |
d17e1dd2 | 137 | |
c6816b94 | 138 | static void flist_ndx_push(struct flist_ndx_list *lp, int ndx) |
d17e1dd2 | 139 | { |
c6816b94 WD |
140 | struct flist_ndx_item *item; |
141 | ||
142 | if (!(item = new(struct flist_ndx_item))) | |
143 | out_of_memory("flist_ndx_push"); | |
144 | item->next = NULL; | |
145 | item->ndx = ndx; | |
146 | if (lp->tail) | |
147 | lp->tail->next = item; | |
d17e1dd2 | 148 | else |
c6816b94 WD |
149 | lp->head = item; |
150 | lp->tail = item; | |
151 | } | |
152 | ||
153 | static int flist_ndx_pop(struct flist_ndx_list *lp) | |
154 | { | |
155 | struct flist_ndx_item *next; | |
156 | int ndx; | |
157 | ||
158 | if (!lp->head) | |
159 | return -1; | |
160 | ||
161 | ndx = lp->head->ndx; | |
162 | next = lp->head->next; | |
163 | free(lp->head); | |
164 | lp->head = next; | |
165 | if (!next) | |
166 | lp->tail = NULL; | |
167 | ||
168 | return ndx; | |
d17e1dd2 WD |
169 | } |
170 | ||
8d9dc9f9 AT |
171 | static void check_timeout(void) |
172 | { | |
173 | time_t t; | |
90ba34e2 | 174 | |
9e2409ab | 175 | if (!io_timeout || ignore_timeout) |
d17e1dd2 | 176 | return; |
8d9dc9f9 | 177 | |
3b0a30eb WD |
178 | if (!last_io_in) { |
179 | last_io_in = time(NULL); | |
8d9dc9f9 AT |
180 | return; |
181 | } | |
182 | ||
183 | t = time(NULL); | |
184 | ||
3b0a30eb | 185 | if (t - last_io_in >= io_timeout) { |
0adb99b9 | 186 | if (!am_server && !am_daemon) { |
4ccfd96c | 187 | rprintf(FERROR, "io timeout after %d seconds -- exiting\n", |
3b0a30eb | 188 | (int)(t-last_io_in)); |
0adb99b9 | 189 | } |
65417579 | 190 | exit_cleanup(RERR_TIMEOUT); |
8d9dc9f9 AT |
191 | } |
192 | } | |
193 | ||
1f75bb10 WD |
194 | /* Note the fds used for the main socket (which might really be a pipe |
195 | * for a local transfer, but we can ignore that). */ | |
196 | void io_set_sock_fds(int f_in, int f_out) | |
197 | { | |
198 | sock_f_in = f_in; | |
199 | sock_f_out = f_out; | |
200 | } | |
201 | ||
3b0a30eb WD |
202 | void set_io_timeout(int secs) |
203 | { | |
204 | io_timeout = secs; | |
205 | ||
206 | if (!io_timeout || io_timeout > SELECT_TIMEOUT) | |
207 | select_timeout = SELECT_TIMEOUT; | |
208 | else | |
209 | select_timeout = io_timeout; | |
210 | ||
211 | allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2; | |
212 | } | |
213 | ||
98f8c9a5 WD |
214 | /* Setup the fd used to receive MSG_* messages. Only needed during the |
215 | * early stages of being a local sender (up through the sending of the | |
216 | * file list) or when we're the generator (to fetch the messages from | |
217 | * the receiver). */ | |
d17e1dd2 WD |
218 | void set_msg_fd_in(int fd) |
219 | { | |
220 | msg_fd_in = fd; | |
221 | } | |
222 | ||
98f8c9a5 WD |
223 | /* Setup the fd used to send our MSG_* messages. Only needed when |
224 | * we're the receiver (to send our messages to the generator). */ | |
d17e1dd2 WD |
225 | void set_msg_fd_out(int fd) |
226 | { | |
227 | msg_fd_out = fd; | |
228 | set_nonblocking(msg_fd_out); | |
229 | } | |
230 | ||
231 | /* Add a message to the pending MSG_* list. */ | |
4a19c3b2 | 232 | static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len) |
554e0a8d | 233 | { |
954bbed8 WD |
234 | struct msg_list_item *m; |
235 | int sz = len + 4 + sizeof m[0] - 1; | |
d17e1dd2 | 236 | |
954bbed8 | 237 | if (!(m = (struct msg_list_item *)new_array(char, sz))) |
c6816b94 | 238 | out_of_memory("msg_list_add"); |
954bbed8 WD |
239 | m->next = NULL; |
240 | m->len = len + 4; | |
241 | SIVAL(m->buf, 0, ((code+MPLEX_BASE)<<24) | len); | |
242 | memcpy(m->buf + 4, buf, len); | |
243 | if (lst->tail) | |
244 | lst->tail->next = m; | |
d17e1dd2 | 245 | else |
954bbed8 WD |
246 | lst->head = m; |
247 | lst->tail = m; | |
554e0a8d AT |
248 | } |
249 | ||
e4c877cf | 250 | static void msg_flush(void) |
3be97bf9 | 251 | { |
e4c877cf WD |
252 | if (am_generator) { |
253 | while (msg_queue.head && io_multiplexing_out) { | |
254 | struct msg_list_item *m = msg_queue.head; | |
255 | if (!(msg_queue.head = m->next)) | |
256 | msg_queue.tail = NULL; | |
257 | stats.total_written += m->len; | |
258 | defer_forwarding_messages++; | |
259 | writefd_unbuffered(sock_f_out, m->buf, m->len); | |
260 | defer_forwarding_messages--; | |
261 | free(m); | |
262 | } | |
263 | } else { | |
264 | while (msg_queue.head) { | |
265 | struct msg_list_item *m = msg_queue.head; | |
266 | if (!(msg_queue.head = m->next)) | |
267 | msg_queue.tail = NULL; | |
268 | defer_forwarding_messages++; | |
269 | writefd_unbuffered(msg_fd_out, m->buf, m->len); | |
270 | defer_forwarding_messages--; | |
271 | free(m); | |
272 | } | |
3be97bf9 WD |
273 | } |
274 | } | |
275 | ||
98f8c9a5 WD |
276 | /* Read a message from the MSG_* fd and handle it. This is called either |
277 | * during the early stages of being a local sender (up through the sending | |
278 | * of the file list) or when we're the generator (to fetch the messages | |
279 | * from the receiver). */ | |
d17e1dd2 | 280 | static void read_msg_fd(void) |
554e0a8d | 281 | { |
f9c6b3e7 | 282 | char buf[2048]; |
06ce139f | 283 | size_t n; |
8ef246e0 | 284 | struct file_list *flist; |
d17e1dd2 | 285 | int fd = msg_fd_in; |
ff41a59f AT |
286 | int tag, len; |
287 | ||
00bdf899 | 288 | /* Temporarily disable msg_fd_in. This is needed to avoid looping back |
af436313 | 289 | * to this routine from writefd_unbuffered(). */ |
3be97bf9 | 290 | no_flush++; |
d17e1dd2 | 291 | msg_fd_in = -1; |
be21e29c | 292 | defer_forwarding_messages++; |
554e0a8d | 293 | |
dde5b772 | 294 | readfd(fd, buf, 4); |
ff41a59f AT |
295 | tag = IVAL(buf, 0); |
296 | ||
297 | len = tag & 0xFFFFFF; | |
d17e1dd2 | 298 | tag = (tag >> 24) - MPLEX_BASE; |
ff41a59f | 299 | |
d17e1dd2 WD |
300 | switch (tag) { |
301 | case MSG_DONE: | |
cc7b86bf | 302 | if (len < 0 || len > 1 || !am_generator) { |
8ef246e0 WD |
303 | invalid_msg: |
304 | rprintf(FERROR, "invalid message %d:%d [%s%s]\n", | |
305 | tag, len, who_am_i(), | |
3ea6e0e7 | 306 | inc_recurse ? "/inc" : ""); |
d17e1dd2 | 307 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 308 | } |
cc7b86bf WD |
309 | if (len) { |
310 | readfd(fd, buf, len); | |
351e23ad | 311 | stats.total_read = read_varlong(fd, 3); |
cc7b86bf | 312 | } |
04c722d5 | 313 | msgdone_cnt++; |
d17e1dd2 WD |
314 | break; |
315 | case MSG_REDO: | |
8ef246e0 WD |
316 | if (len != 4 || !am_generator) |
317 | goto invalid_msg; | |
dde5b772 | 318 | readfd(fd, buf, 4); |
47c11975 | 319 | if (remove_source_files) |
d6081c82 | 320 | decrement_active_files(IVAL(buf,0)); |
c6816b94 | 321 | flist_ndx_push(&redo_list, IVAL(buf,0)); |
3ea6e0e7 | 322 | if (inc_recurse) |
8ef246e0 WD |
323 | decrement_flist_in_progress(IVAL(buf,0), 1); |
324 | break; | |
325 | case MSG_FLIST: | |
3ea6e0e7 | 326 | if (len != 4 || !am_generator || !inc_recurse) |
8ef246e0 | 327 | goto invalid_msg; |
dde5b772 | 328 | readfd(fd, buf, 4); |
8ef246e0 WD |
329 | /* Read extra file list from receiver. */ |
330 | assert(iobuf_in != NULL); | |
331 | assert(iobuf_f_in == fd); | |
332 | flist = recv_file_list(fd); | |
333 | flist->parent_ndx = IVAL(buf,0); | |
334 | break; | |
335 | case MSG_FLIST_EOF: | |
3ea6e0e7 | 336 | if (len != 0 || !am_generator || !inc_recurse) |
8ef246e0 WD |
337 | goto invalid_msg; |
338 | flist_eof = 1; | |
d17e1dd2 | 339 | break; |
0d67e00a | 340 | case MSG_DELETED: |
8ef246e0 WD |
341 | if (len >= (int)sizeof buf || !am_generator) |
342 | goto invalid_msg; | |
dde5b772 | 343 | readfd(fd, buf, len); |
12ccc73a | 344 | send_msg(MSG_DELETED, buf, len); |
0d67e00a | 345 | break; |
9981c27e | 346 | case MSG_SUCCESS: |
8ef246e0 WD |
347 | if (len != 4 || !am_generator) |
348 | goto invalid_msg; | |
dde5b772 | 349 | readfd(fd, buf, len); |
47c11975 | 350 | if (remove_source_files) { |
d6081c82 | 351 | decrement_active_files(IVAL(buf,0)); |
12ccc73a | 352 | send_msg(MSG_SUCCESS, buf, len); |
d6081c82 | 353 | } |
cdf236aa WD |
354 | if (preserve_hard_links) |
355 | flist_ndx_push(&hlink_list, IVAL(buf,0)); | |
3ea6e0e7 | 356 | if (inc_recurse) |
8ef246e0 WD |
357 | decrement_flist_in_progress(IVAL(buf,0), 0); |
358 | break; | |
359 | case MSG_NO_SEND: | |
360 | if (len != 4 || !am_generator) | |
361 | goto invalid_msg; | |
dde5b772 | 362 | readfd(fd, buf, len); |
3ea6e0e7 | 363 | if (inc_recurse) |
8ef246e0 | 364 | decrement_flist_in_progress(IVAL(buf,0), 0); |
9981c27e | 365 | break; |
72f2d1b3 | 366 | case MSG_SOCKERR: |
64119c79 | 367 | case MSG_CLIENT: |
8ef246e0 WD |
368 | if (!am_generator) |
369 | goto invalid_msg; | |
64119c79 | 370 | if (tag == MSG_SOCKERR) |
8ef246e0 | 371 | io_end_multiplex_out(); |
72f2d1b3 | 372 | /* FALL THROUGH */ |
d17e1dd2 WD |
373 | case MSG_INFO: |
374 | case MSG_ERROR: | |
375 | case MSG_LOG: | |
376 | while (len) { | |
377 | n = len; | |
378 | if (n >= sizeof buf) | |
379 | n = sizeof buf - 1; | |
dde5b772 | 380 | readfd(fd, buf, n); |
54b0dfa0 | 381 | rwrite((enum logcode)tag, buf, n); |
d17e1dd2 WD |
382 | len -= n; |
383 | } | |
384 | break; | |
385 | default: | |
f8b9da1a WD |
386 | rprintf(FERROR, "unknown message %d:%d [%s]\n", |
387 | tag, len, who_am_i()); | |
d17e1dd2 WD |
388 | exit_cleanup(RERR_STREAMIO); |
389 | } | |
390 | ||
3be97bf9 | 391 | no_flush--; |
d17e1dd2 | 392 | msg_fd_in = fd; |
3be97bf9 | 393 | if (!--defer_forwarding_messages) |
e4c877cf | 394 | msg_flush(); |
d17e1dd2 WD |
395 | } |
396 | ||
d6081c82 | 397 | /* This is used by the generator to limit how many file transfers can |
47c11975 | 398 | * be active at once when --remove-source-files is specified. Without |
d6081c82 WD |
399 | * this, sender-side deletions were mostly happening at the end. */ |
400 | void increment_active_files(int ndx, int itemizing, enum logcode code) | |
401 | { | |
402 | /* TODO: tune these limits? */ | |
5b986297 | 403 | while (active_filecnt >= (active_bytecnt >= 128*1024 ? 10 : 50)) { |
04c722d5 WD |
404 | check_for_finished_files(itemizing, code, 0); |
405 | if (iobuf_out_cnt) | |
406 | io_flush(NORMAL_FLUSH); | |
407 | else | |
408 | read_msg_fd(); | |
d6081c82 WD |
409 | } |
410 | ||
411 | active_filecnt++; | |
121bfb2b | 412 | active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]); |
d6081c82 WD |
413 | } |
414 | ||
8ef246e0 | 415 | static void decrement_active_files(int ndx) |
d6081c82 | 416 | { |
8ef246e0 WD |
417 | struct file_list *flist = flist_for_ndx(ndx); |
418 | assert(flist != NULL); | |
d6081c82 | 419 | active_filecnt--; |
8ef246e0 WD |
420 | active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]); |
421 | } | |
422 | ||
423 | static void decrement_flist_in_progress(int ndx, int redo) | |
424 | { | |
425 | struct file_list *flist = cur_flist ? cur_flist : first_flist; | |
426 | ||
427 | while (ndx < flist->ndx_start) { | |
428 | if (flist == first_flist) { | |
429 | invalid_ndx: | |
430 | rprintf(FERROR, | |
431 | "Invalid file index: %d (%d - %d) [%s]\n", | |
432 | ndx, first_flist->ndx_start, | |
433 | first_flist->prev->ndx_start + first_flist->prev->count - 1, | |
434 | who_am_i()); | |
435 | exit_cleanup(RERR_PROTOCOL); | |
436 | } | |
437 | flist = flist->prev; | |
438 | } | |
439 | while (ndx >= flist->ndx_start + flist->count) { | |
440 | if (!(flist = flist->next)) | |
441 | goto invalid_ndx; | |
442 | } | |
443 | ||
444 | flist->in_progress--; | |
445 | if (redo) | |
446 | flist->to_redo++; | |
d6081c82 WD |
447 | } |
448 | ||
3be97bf9 WD |
449 | /* Write an message to a multiplexed stream. If this fails, rsync exits. */ |
450 | static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len) | |
d17e1dd2 | 451 | { |
3be97bf9 WD |
452 | char buffer[1024]; |
453 | size_t n = len; | |
d17e1dd2 | 454 | |
3be97bf9 WD |
455 | SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); |
456 | ||
457 | if (n > sizeof buffer - 4) | |
458 | n = 0; | |
459 | else | |
460 | memcpy(buffer + 4, buf, n); | |
461 | ||
462 | writefd_unbuffered(fd, buffer, n+4); | |
463 | ||
464 | len -= n; | |
465 | buf += n; | |
466 | ||
467 | if (len) { | |
468 | defer_forwarding_messages++; | |
469 | writefd_unbuffered(fd, buf, len); | |
470 | if (!--defer_forwarding_messages) | |
e4c877cf | 471 | msg_flush(); |
8ef246e0 | 472 | } |
d17e1dd2 WD |
473 | } |
474 | ||
4a19c3b2 | 475 | int send_msg(enum msgcode code, const char *buf, int len) |
37f35d89 WD |
476 | { |
477 | if (msg_fd_out < 0) { | |
12ccc73a WD |
478 | if (!defer_forwarding_messages) |
479 | return io_multiplex_write(code, buf, len); | |
480 | if (!io_multiplexing_out) | |
481 | return 0; | |
e4c877cf | 482 | msg_list_add(&msg_queue, code, buf, len); |
12ccc73a | 483 | return 1; |
37f35d89 | 484 | } |
e4c877cf WD |
485 | if (flist_forward_from >= 0) |
486 | msg_list_add(&msg_queue, code, buf, len); | |
487 | else | |
488 | mplex_write(msg_fd_out, code, buf, len); | |
12ccc73a | 489 | return 1; |
37f35d89 WD |
490 | } |
491 | ||
155d9206 WD |
492 | void send_msg_int(enum msgcode code, int num) |
493 | { | |
494 | char numbuf[4]; | |
495 | SIVAL(numbuf, 0, num); | |
496 | send_msg(code, numbuf, 4); | |
497 | } | |
498 | ||
8ef246e0 | 499 | void wait_for_receiver(void) |
d17e1dd2 | 500 | { |
2a5df862 WD |
501 | if (iobuf_out_cnt) |
502 | io_flush(NORMAL_FLUSH); | |
503 | else | |
504 | read_msg_fd(); | |
8ef246e0 | 505 | } |
554e0a8d | 506 | |
8ef246e0 WD |
507 | int get_redo_num(void) |
508 | { | |
c6816b94 | 509 | return flist_ndx_pop(&redo_list); |
554e0a8d AT |
510 | } |
511 | ||
cdf236aa WD |
512 | int get_hlink_num(void) |
513 | { | |
514 | return flist_ndx_pop(&hlink_list); | |
515 | } | |
516 | ||
56014c8c WD |
517 | /** |
518 | * When we're the receiver and we have a local --files-from list of names | |
519 | * that needs to be sent over the socket to the sender, we have to do two | |
520 | * things at the same time: send the sender a list of what files we're | |
521 | * processing and read the incoming file+info list from the sender. We do | |
522 | * this by augmenting the read_timeout() function to copy this data. It | |
523 | * uses the io_filesfrom_buf to read a block of data from f_in (when it is | |
524 | * ready, since it might be a pipe) and then blast it out f_out (when it | |
525 | * is ready to receive more data). | |
526 | */ | |
527 | void io_set_filesfrom_fds(int f_in, int f_out) | |
528 | { | |
529 | io_filesfrom_f_in = f_in; | |
530 | io_filesfrom_f_out = f_out; | |
531 | io_filesfrom_bp = io_filesfrom_buf; | |
532 | io_filesfrom_lastchar = '\0'; | |
533 | io_filesfrom_buflen = 0; | |
534 | } | |
720b47f2 | 535 | |
cb2e1f18 WD |
536 | /* It's almost always an error to get an EOF when we're trying to read from the |
537 | * network, because the protocol is (for the most part) self-terminating. | |
880da007 | 538 | * |
cb2e1f18 WD |
539 | * There is one case for the receiver when it is at the end of the transfer |
540 | * (hanging around reading any keep-alive packets that might come its way): if | |
541 | * the sender dies before the generator's kill-signal comes through, we can end | |
542 | * up here needing to loop until the kill-signal arrives. In this situation, | |
543 | * kluge_around_eof will be < 0. | |
544 | * | |
545 | * There is another case for older protocol versions (< 24) where the module | |
546 | * listing was not terminated, so we must ignore an EOF error in that case and | |
547 | * exit. In this situation, kluge_around_eof will be > 0. */ | |
1f75bb10 | 548 | static void whine_about_eof(int fd) |
7a55d06e | 549 | { |
574c2500 | 550 | if (kluge_around_eof && fd == sock_f_in) { |
55bb7fff | 551 | int i; |
574c2500 WD |
552 | if (kluge_around_eof > 0) |
553 | exit_cleanup(0); | |
55bb7fff WD |
554 | /* If we're still here after 10 seconds, exit with an error. */ |
555 | for (i = 10*1000/20; i--; ) | |
574c2500 WD |
556 | msleep(20); |
557 | } | |
3151cbae | 558 | |
00bdf899 | 559 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
dca68b0a WD |
560 | "(%.0f bytes received so far) [%s]\n", |
561 | (double)stats.total_read, who_am_i()); | |
00bdf899 WD |
562 | |
563 | exit_cleanup(RERR_STREAMIO); | |
7a55d06e | 564 | } |
720b47f2 | 565 | |
880da007 | 566 | /** |
6ed6d7f5 | 567 | * Read from a socket with I/O timeout. return the number of bytes |
c3563c46 MP |
568 | * read. If no bytes can be read then exit, never return a number <= 0. |
569 | * | |
8886f8d0 MP |
570 | * TODO: If the remote shell connection fails, then current versions |
571 | * actually report an "unexpected EOF" error here. Since it's a | |
572 | * fairly common mistake to try to use rsh when ssh is required, we | |
573 | * should trap that: if we fail to read any data at all, we should | |
574 | * give a better explanation. We can tell whether the connection has | |
575 | * started by looking e.g. at whether the remote version is known yet. | |
c3563c46 | 576 | */ |
3151cbae | 577 | static int read_timeout(int fd, char *buf, size_t len) |
8d9dc9f9 | 578 | { |
d8aeda1e | 579 | int n, cnt = 0; |
4c36ddbe | 580 | |
dde5b772 | 581 | io_flush(FULL_FLUSH); |
ea2111d1 | 582 | |
d8aeda1e | 583 | while (cnt == 0) { |
7a55d06e | 584 | /* until we manage to read *something* */ |
56014c8c | 585 | fd_set r_fds, w_fds; |
4c36ddbe | 586 | struct timeval tv; |
1ea087a7 | 587 | int maxfd = fd; |
a57873b7 | 588 | int count; |
4c36ddbe | 589 | |
56014c8c | 590 | FD_ZERO(&r_fds); |
a7026ba9 | 591 | FD_ZERO(&w_fds); |
56014c8c | 592 | FD_SET(fd, &r_fds); |
3309507d | 593 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
594 | int new_fd; |
595 | if (io_filesfrom_buflen == 0) { | |
3309507d | 596 | if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
597 | FD_SET(io_filesfrom_f_in, &r_fds); |
598 | new_fd = io_filesfrom_f_in; | |
599 | } else { | |
600 | io_filesfrom_f_out = -1; | |
601 | new_fd = -1; | |
602 | } | |
603 | } else { | |
56014c8c WD |
604 | FD_SET(io_filesfrom_f_out, &w_fds); |
605 | new_fd = io_filesfrom_f_out; | |
606 | } | |
1ea087a7 WD |
607 | if (new_fd > maxfd) |
608 | maxfd = new_fd; | |
554e0a8d AT |
609 | } |
610 | ||
e626b29e | 611 | tv.tv_sec = select_timeout; |
4c36ddbe AT |
612 | tv.tv_usec = 0; |
613 | ||
554e0a8d AT |
614 | errno = 0; |
615 | ||
a7026ba9 | 616 | count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); |
a57873b7 | 617 | |
a57873b7 | 618 | if (count <= 0) { |
2a5df862 WD |
619 | if (errno == EBADF) { |
620 | defer_forwarding_messages = 0; | |
554e0a8d | 621 | exit_cleanup(RERR_SOCKETIO); |
2a5df862 | 622 | } |
bd717af8 | 623 | check_timeout(); |
4c36ddbe AT |
624 | continue; |
625 | } | |
626 | ||
3309507d | 627 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
628 | if (io_filesfrom_buflen) { |
629 | if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { | |
630 | int l = write(io_filesfrom_f_out, | |
631 | io_filesfrom_bp, | |
632 | io_filesfrom_buflen); | |
633 | if (l > 0) { | |
634 | if (!(io_filesfrom_buflen -= l)) | |
635 | io_filesfrom_bp = io_filesfrom_buf; | |
636 | else | |
637 | io_filesfrom_bp += l; | |
638 | } else { | |
639 | /* XXX should we complain? */ | |
640 | io_filesfrom_f_out = -1; | |
641 | } | |
642 | } | |
3309507d | 643 | } else if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
644 | if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { |
645 | int l = read(io_filesfrom_f_in, | |
646 | io_filesfrom_buf, | |
647 | sizeof io_filesfrom_buf); | |
648 | if (l <= 0) { | |
649 | /* Send end-of-file marker */ | |
650 | io_filesfrom_buf[0] = '\0'; | |
651 | io_filesfrom_buf[1] = '\0'; | |
652 | io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1; | |
653 | io_filesfrom_f_in = -1; | |
654 | } else { | |
56014c8c WD |
655 | if (!eol_nulls) { |
656 | char *s = io_filesfrom_buf + l; | |
657 | /* Transform CR and/or LF into '\0' */ | |
658 | while (s-- > io_filesfrom_buf) { | |
659 | if (*s == '\n' || *s == '\r') | |
660 | *s = '\0'; | |
661 | } | |
662 | } | |
663 | if (!io_filesfrom_lastchar) { | |
664 | /* Last buf ended with a '\0', so don't | |
665 | * let this buf start with one. */ | |
666 | while (l && !*io_filesfrom_bp) | |
667 | io_filesfrom_bp++, l--; | |
668 | } | |
669 | if (!l) | |
670 | io_filesfrom_bp = io_filesfrom_buf; | |
671 | else { | |
672 | char *f = io_filesfrom_bp; | |
673 | char *t = f; | |
674 | char *eob = f + l; | |
675 | /* Eliminate any multi-'\0' runs. */ | |
676 | while (f != eob) { | |
677 | if (!(*t++ = *f++)) { | |
678 | while (f != eob && !*f) | |
679 | f++, l--; | |
680 | } | |
681 | } | |
682 | io_filesfrom_lastchar = f[-1]; | |
683 | } | |
684 | io_filesfrom_buflen = l; | |
685 | } | |
686 | } | |
687 | } | |
688 | } | |
689 | ||
f89b9368 WD |
690 | if (!FD_ISSET(fd, &r_fds)) |
691 | continue; | |
554e0a8d | 692 | |
4c36ddbe AT |
693 | n = read(fd, buf, len); |
694 | ||
1ea087a7 WD |
695 | if (n <= 0) { |
696 | if (n == 0) | |
1f75bb10 | 697 | whine_about_eof(fd); /* Doesn't return. */ |
d62bcc17 WD |
698 | if (errno == EINTR || errno == EWOULDBLOCK |
699 | || errno == EAGAIN) | |
7a55d06e | 700 | continue; |
1f75bb10 WD |
701 | |
702 | /* Don't write errors on a dead socket. */ | |
72f2d1b3 | 703 | if (fd == sock_f_in) { |
8ef246e0 | 704 | io_end_multiplex_out(); |
72f2d1b3 WD |
705 | rsyserr(FSOCKERR, errno, "read error"); |
706 | } else | |
707 | rsyserr(FERROR, errno, "read error"); | |
1f75bb10 | 708 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 709 | } |
00bdf899 WD |
710 | |
711 | buf += n; | |
712 | len -= n; | |
d8aeda1e | 713 | cnt += n; |
1f75bb10 | 714 | |
3b0a30eb WD |
715 | if (fd == sock_f_in && io_timeout) |
716 | last_io_in = time(NULL); | |
4c36ddbe | 717 | } |
8d9dc9f9 | 718 | |
d8aeda1e | 719 | return cnt; |
4c36ddbe | 720 | } |
8d9dc9f9 | 721 | |
56014c8c WD |
722 | /** |
723 | * Read a line into the "fname" buffer (which must be at least MAXPATHLEN | |
724 | * characters long). | |
725 | */ | |
726 | int read_filesfrom_line(int fd, char *fname) | |
727 | { | |
728 | char ch, *s, *eob = fname + MAXPATHLEN - 1; | |
729 | int cnt; | |
d19320fd | 730 | int reading_remotely = filesfrom_host != NULL; |
56014c8c WD |
731 | int nulls = eol_nulls || reading_remotely; |
732 | ||
733 | start: | |
734 | s = fname; | |
735 | while (1) { | |
736 | cnt = read(fd, &ch, 1); | |
737 | if (cnt < 0 && (errno == EWOULDBLOCK | |
738 | || errno == EINTR || errno == EAGAIN)) { | |
739 | struct timeval tv; | |
6c850772 WD |
740 | fd_set r_fds, e_fds; |
741 | FD_ZERO(&r_fds); | |
742 | FD_SET(fd, &r_fds); | |
743 | FD_ZERO(&e_fds); | |
744 | FD_SET(fd, &e_fds); | |
e626b29e | 745 | tv.tv_sec = select_timeout; |
56014c8c | 746 | tv.tv_usec = 0; |
6c850772 | 747 | if (!select(fd+1, &r_fds, NULL, &e_fds, &tv)) |
56014c8c | 748 | check_timeout(); |
6c850772 WD |
749 | if (FD_ISSET(fd, &e_fds)) { |
750 | rsyserr(FINFO, errno, | |
751 | "select exception on fd %d", fd); | |
752 | } | |
56014c8c WD |
753 | continue; |
754 | } | |
755 | if (cnt != 1) | |
756 | break; | |
757 | if (nulls? !ch : (ch == '\r' || ch == '\n')) { | |
758 | /* Skip empty lines if reading locally. */ | |
759 | if (!reading_remotely && s == fname) | |
760 | continue; | |
761 | break; | |
762 | } | |
763 | if (s < eob) | |
764 | *s++ = ch; | |
765 | } | |
766 | *s = '\0'; | |
7a55d06e | 767 | |
6b45fcf1 WD |
768 | /* Dump comments. */ |
769 | if (*fname == '#' || *fname == ';') | |
56014c8c WD |
770 | goto start; |
771 | ||
772 | return s - fname; | |
773 | } | |
7a55d06e | 774 | |
8ef246e0 | 775 | int io_start_buffering_out(int f_out) |
1f75bb10 | 776 | { |
8ef246e0 WD |
777 | if (iobuf_out) { |
778 | assert(f_out == iobuf_f_out); | |
779 | return 0; | |
780 | } | |
1f75bb10 WD |
781 | if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) |
782 | out_of_memory("io_start_buffering_out"); | |
783 | iobuf_out_cnt = 0; | |
8ef246e0 WD |
784 | iobuf_f_out = f_out; |
785 | return 1; | |
1f75bb10 WD |
786 | } |
787 | ||
8ef246e0 | 788 | int io_start_buffering_in(int f_in) |
1f75bb10 | 789 | { |
8ef246e0 WD |
790 | if (iobuf_in) { |
791 | assert(f_in == iobuf_f_in); | |
792 | return 0; | |
793 | } | |
1f75bb10 WD |
794 | iobuf_in_siz = 2 * IO_BUFFER_SIZE; |
795 | if (!(iobuf_in = new_array(char, iobuf_in_siz))) | |
796 | out_of_memory("io_start_buffering_in"); | |
8ef246e0 WD |
797 | iobuf_f_in = f_in; |
798 | return 1; | |
1f75bb10 WD |
799 | } |
800 | ||
8ef246e0 | 801 | void io_end_buffering_in(void) |
1f75bb10 | 802 | { |
8ef246e0 WD |
803 | if (!iobuf_in) |
804 | return; | |
805 | free(iobuf_in); | |
806 | iobuf_in = NULL; | |
807 | iobuf_in_ndx = 0; | |
808 | iobuf_in_remaining = 0; | |
809 | iobuf_f_in = -1; | |
810 | } | |
811 | ||
812 | void io_end_buffering_out(void) | |
813 | { | |
814 | if (!iobuf_out) | |
815 | return; | |
816 | io_flush(FULL_FLUSH); | |
817 | free(iobuf_out); | |
818 | iobuf_out = NULL; | |
819 | iobuf_f_out = -1; | |
1f75bb10 WD |
820 | } |
821 | ||
be91bd81 | 822 | void maybe_flush_socket(int important) |
626bec8e | 823 | { |
be91bd81 WD |
824 | if (iobuf_out && iobuf_out_cnt |
825 | && (important || time(NULL) - last_io_out >= 5)) | |
626bec8e WD |
826 | io_flush(NORMAL_FLUSH); |
827 | } | |
828 | ||
cdf236aa | 829 | void maybe_send_keepalive(void) |
9e2409ab | 830 | { |
3b0a30eb | 831 | if (time(NULL) - last_io_out >= allowed_lull) { |
9e2409ab | 832 | if (!iobuf_out || !iobuf_out_cnt) { |
3221f451 WD |
833 | if (protocol_version < 29) |
834 | return; /* there's nothing we can do */ | |
8ef246e0 WD |
835 | if (protocol_version >= 30) |
836 | send_msg(MSG_NOOP, "", 0); | |
837 | else { | |
838 | write_int(sock_f_out, cur_flist->count); | |
839 | write_shortint(sock_f_out, ITEM_IS_NEW); | |
840 | } | |
9e2409ab WD |
841 | } |
842 | if (iobuf_out) | |
843 | io_flush(NORMAL_FLUSH); | |
844 | } | |
845 | } | |
846 | ||
8ef246e0 WD |
847 | void start_flist_forward(int f_in) |
848 | { | |
849 | assert(iobuf_out != NULL); | |
850 | assert(iobuf_f_out == msg_fd_out); | |
851 | flist_forward_from = f_in; | |
852 | } | |
853 | ||
854 | void stop_flist_forward() | |
855 | { | |
8ef246e0 | 856 | flist_forward_from = -1; |
dde5b772 | 857 | io_flush(FULL_FLUSH); |
8ef246e0 WD |
858 | } |
859 | ||
880da007 MP |
860 | /** |
861 | * Continue trying to read len bytes - don't return until len has been | |
862 | * read. | |
863 | **/ | |
3151cbae | 864 | static void read_loop(int fd, char *buf, size_t len) |
4c36ddbe AT |
865 | { |
866 | while (len) { | |
867 | int n = read_timeout(fd, buf, len); | |
868 | ||
869 | buf += n; | |
870 | len -= n; | |
8d9dc9f9 AT |
871 | } |
872 | } | |
873 | ||
7a55d06e MP |
874 | /** |
875 | * Read from the file descriptor handling multiplexing - return number | |
876 | * of bytes read. | |
d62bcc17 WD |
877 | * |
878 | * Never returns <= 0. | |
7a55d06e | 879 | */ |
c399d22a | 880 | static int readfd_unbuffered(int fd, char *buf, size_t len) |
8d9dc9f9 | 881 | { |
f2a4853c | 882 | size_t msg_bytes; |
d8aeda1e | 883 | int tag, cnt = 0; |
33544bf4 | 884 | char line[BIGPATHBUFLEN]; |
8d9dc9f9 | 885 | |
8ef246e0 | 886 | if (!iobuf_in || fd != iobuf_f_in) |
4c36ddbe | 887 | return read_timeout(fd, buf, len); |
8d9dc9f9 | 888 | |
8ef246e0 WD |
889 | if (!io_multiplexing_in && iobuf_in_remaining == 0) { |
890 | iobuf_in_remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); | |
1f75bb10 | 891 | iobuf_in_ndx = 0; |
76c21947 WD |
892 | } |
893 | ||
d8aeda1e | 894 | while (cnt == 0) { |
8ef246e0 WD |
895 | if (iobuf_in_remaining) { |
896 | len = MIN(len, iobuf_in_remaining); | |
1f75bb10 WD |
897 | memcpy(buf, iobuf_in + iobuf_in_ndx, len); |
898 | iobuf_in_ndx += len; | |
8ef246e0 | 899 | iobuf_in_remaining -= len; |
d8aeda1e | 900 | cnt = len; |
76c21947 | 901 | break; |
8d9dc9f9 AT |
902 | } |
903 | ||
909ce14f | 904 | read_loop(fd, line, 4); |
ff41a59f | 905 | tag = IVAL(line, 0); |
679e7657 | 906 | |
f2a4853c | 907 | msg_bytes = tag & 0xFFFFFF; |
d17e1dd2 | 908 | tag = (tag >> 24) - MPLEX_BASE; |
8d9dc9f9 | 909 | |
d17e1dd2 WD |
910 | switch (tag) { |
911 | case MSG_DATA: | |
f2a4853c | 912 | if (msg_bytes > iobuf_in_siz) { |
1f75bb10 | 913 | if (!(iobuf_in = realloc_array(iobuf_in, char, |
f2a4853c | 914 | msg_bytes))) |
c399d22a | 915 | out_of_memory("readfd_unbuffered"); |
f2a4853c | 916 | iobuf_in_siz = msg_bytes; |
76c21947 | 917 | } |
f2a4853c | 918 | read_loop(fd, iobuf_in, msg_bytes); |
8ef246e0 | 919 | iobuf_in_remaining = msg_bytes; |
1f75bb10 | 920 | iobuf_in_ndx = 0; |
d17e1dd2 | 921 | break; |
8ef246e0 WD |
922 | case MSG_NOOP: |
923 | if (am_sender) | |
924 | maybe_send_keepalive(); | |
925 | break; | |
926 | case MSG_IO_ERROR: | |
927 | if (msg_bytes != 4) | |
928 | goto invalid_msg; | |
929 | read_loop(fd, line, msg_bytes); | |
930 | io_error |= IVAL(line, 0); | |
931 | break; | |
0d67e00a | 932 | case MSG_DELETED: |
f2a4853c WD |
933 | if (msg_bytes >= sizeof line) |
934 | goto overflow; | |
935 | read_loop(fd, line, msg_bytes); | |
0d67e00a | 936 | /* A directory name was sent with the trailing null */ |
f2a4853c | 937 | if (msg_bytes > 0 && !line[msg_bytes-1]) |
0d67e00a | 938 | log_delete(line, S_IFDIR); |
12bda6f7 WD |
939 | else { |
940 | line[msg_bytes] = '\0'; | |
0d67e00a | 941 | log_delete(line, S_IFREG); |
12bda6f7 | 942 | } |
0d67e00a | 943 | break; |
9981c27e | 944 | case MSG_SUCCESS: |
f2a4853c | 945 | if (msg_bytes != 4) { |
8ef246e0 | 946 | invalid_msg: |
cdf236aa | 947 | rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n", |
f2a4853c | 948 | tag, (long)msg_bytes, who_am_i()); |
9981c27e WD |
949 | exit_cleanup(RERR_STREAMIO); |
950 | } | |
f2a4853c | 951 | read_loop(fd, line, msg_bytes); |
9981c27e | 952 | successful_send(IVAL(line, 0)); |
9981c27e | 953 | break; |
8ef246e0 WD |
954 | case MSG_NO_SEND: |
955 | if (msg_bytes != 4) | |
956 | goto invalid_msg; | |
957 | read_loop(fd, line, msg_bytes); | |
958 | send_msg_int(MSG_NO_SEND, IVAL(line, 0)); | |
959 | break; | |
d17e1dd2 WD |
960 | case MSG_INFO: |
961 | case MSG_ERROR: | |
f2a4853c WD |
962 | if (msg_bytes >= sizeof line) { |
963 | overflow: | |
bd9fca47 | 964 | rprintf(FERROR, |
cdf236aa | 965 | "multiplexing overflow %d:%ld [%s]\n", |
f2a4853c | 966 | tag, (long)msg_bytes, who_am_i()); |
d17e1dd2 WD |
967 | exit_cleanup(RERR_STREAMIO); |
968 | } | |
f2a4853c WD |
969 | read_loop(fd, line, msg_bytes); |
970 | rwrite((enum logcode)tag, line, msg_bytes); | |
d17e1dd2 WD |
971 | break; |
972 | default: | |
cdf236aa WD |
973 | rprintf(FERROR, "unexpected tag %d [%s]\n", |
974 | tag, who_am_i()); | |
65417579 | 975 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 976 | } |
8d9dc9f9 AT |
977 | } |
978 | ||
8ef246e0 | 979 | if (iobuf_in_remaining == 0) |
d17e1dd2 | 980 | io_flush(NORMAL_FLUSH); |
76c21947 | 981 | |
d8aeda1e | 982 | return cnt; |
8d9dc9f9 AT |
983 | } |
984 | ||
dde5b772 WD |
985 | /* Do a buffered read from fd. Don't return until all N bytes have |
986 | * been read. If all N can't be read then exit with an error. */ | |
3151cbae | 987 | static void readfd(int fd, char *buffer, size_t N) |
720b47f2 | 988 | { |
d8aeda1e | 989 | int cnt; |
d62bcc17 | 990 | size_t total = 0; |
3151cbae | 991 | |
6ba9279f | 992 | while (total < N) { |
d8aeda1e WD |
993 | cnt = readfd_unbuffered(fd, buffer + total, N-total); |
994 | total += cnt; | |
7f28dbee | 995 | } |
1b7c47cb | 996 | |
b9f592fb WD |
997 | if (fd == write_batch_monitor_in) { |
998 | if ((size_t)write(batch_fd, buffer, total) != total) | |
999 | exit_cleanup(RERR_FILEIO); | |
1000 | } | |
1f75bb10 | 1001 | |
8ef246e0 WD |
1002 | if (fd == flist_forward_from) |
1003 | writefd(iobuf_f_out, buffer, total); | |
1004 | ||
1f75bb10 WD |
1005 | if (fd == sock_f_in) |
1006 | stats.total_read += total; | |
720b47f2 AT |
1007 | } |
1008 | ||
3a993aa4 | 1009 | unsigned short read_shortint(int f) |
9361f839 | 1010 | { |
482f48cc WD |
1011 | char b[2]; |
1012 | readfd(f, b, 2); | |
1013 | return (UVAL(b, 1) << 8) + UVAL(b, 0); | |
9361f839 WD |
1014 | } |
1015 | ||
b7922338 | 1016 | int32 read_int(int f) |
720b47f2 | 1017 | { |
4c36ddbe | 1018 | char b[4]; |
d8aeda1e | 1019 | int32 num; |
d730b113 | 1020 | |
482f48cc WD |
1021 | readfd(f, b, 4); |
1022 | num = IVAL(b, 0); | |
1023 | #if SIZEOF_INT32 > 4 | |
1024 | if (num & (int32)0x80000000) | |
1025 | num |= ~(int32)0xffffffff; | |
1026 | #endif | |
d8aeda1e | 1027 | return num; |
720b47f2 AT |
1028 | } |
1029 | ||
351e23ad | 1030 | int32 read_varint(int f) |
3a6a366f | 1031 | { |
351e23ad WD |
1032 | union { |
1033 | char b[5]; | |
1034 | int32 x; | |
1035 | } u; | |
1036 | uchar ch; | |
1037 | int extra; | |
1038 | ||
1039 | u.x = 0; | |
1040 | readfd(f, (char*)&ch, 1); | |
1041 | extra = int_byte_extra[ch / 4]; | |
1042 | if (extra) { | |
1043 | uchar bit = ((uchar)1<<(8-extra)); | |
1044 | if (extra >= (int)sizeof u.b) { | |
1045 | rprintf(FERROR, "Overflow in read_varint()\n"); | |
1046 | exit_cleanup(RERR_STREAMIO); | |
1047 | } | |
1048 | readfd(f, u.b, extra); | |
1049 | u.b[extra] = ch & (bit-1); | |
1050 | } else | |
1051 | u.b[0] = ch; | |
1052 | #if CAREFUL_ALIGNMENT | |
1053 | u.x = IVAL(u.b,0); | |
1054 | #endif | |
1055 | #if SIZEOF_INT32 > 4 | |
1056 | if (u.x & (int32)0x80000000) | |
1057 | u.x |= ~(int32)0xffffffff; | |
1058 | #endif | |
1059 | return u.x; | |
1060 | } | |
71c46176 | 1061 | |
351e23ad WD |
1062 | int64 read_varlong(int f, uchar min_bytes) |
1063 | { | |
1064 | union { | |
1065 | char b[9]; | |
1066 | int64 x; | |
1067 | } u; | |
1068 | char b2[8]; | |
1069 | int extra; | |
71c46176 | 1070 | |
031fa9ad | 1071 | #if SIZEOF_INT64 < 8 |
351e23ad | 1072 | memset(u.b, 0, 8); |
031fa9ad | 1073 | #else |
351e23ad | 1074 | u.x = 0; |
031fa9ad | 1075 | #endif |
351e23ad WD |
1076 | readfd(f, b2, min_bytes); |
1077 | memcpy(u.b, b2+1, min_bytes-1); | |
1078 | extra = int_byte_extra[CVAL(b2, 0) / 4]; | |
1079 | if (extra) { | |
1080 | uchar bit = ((uchar)1<<(8-extra)); | |
1081 | if (min_bytes + extra > (int)sizeof u.b) { | |
1082 | rprintf(FERROR, "Overflow in read_varlong()\n"); | |
1083 | exit_cleanup(RERR_STREAMIO); | |
1084 | } | |
1085 | readfd(f, u.b + min_bytes - 1, extra); | |
1086 | u.b[min_bytes + extra - 1] = CVAL(b2, 0) & (bit-1); | |
4ea4acf1 | 1087 | #if SIZEOF_INT64 < 8 |
351e23ad | 1088 | if (min_bytes + extra > 5 || u.b[4] || CVAL(u.b,3) & 0x80) { |
4ea4acf1 WD |
1089 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
1090 | exit_cleanup(RERR_UNSUPPORTED); | |
1091 | } | |
1092 | #endif | |
351e23ad WD |
1093 | } else |
1094 | u.b[min_bytes + extra - 1] = CVAL(b2, 0); | |
1095 | #if SIZEOF_INT64 < 8 | |
1096 | u.x = IVAL(u.b,0); | |
1097 | #elif CAREFUL_ALIGNMENT | |
1098 | u.x = IVAL(u.b,0) | (((int64)IVAL(u.b,4))<<32); | |
1099 | #endif | |
1100 | return u.x; | |
1101 | } | |
1102 | ||
1103 | int64 read_longint(int f) | |
1104 | { | |
4ea4acf1 | 1105 | #if SIZEOF_INT64 >= 8 |
351e23ad | 1106 | char b[9]; |
4ea4acf1 | 1107 | #endif |
351e23ad | 1108 | int32 num = read_int(f); |
71c46176 | 1109 | |
351e23ad WD |
1110 | if (num != (int32)0xffffffff) |
1111 | return num; | |
1112 | ||
1113 | #if SIZEOF_INT64 < 8 | |
1114 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1115 | exit_cleanup(RERR_UNSUPPORTED); | |
1116 | #else | |
1117 | readfd(f, b, 8); | |
1118 | return IVAL(b,0) | (((int64)IVAL(b,4))<<32); | |
1119 | #endif | |
3a6a366f AT |
1120 | } |
1121 | ||
4a19c3b2 | 1122 | void read_buf(int f, char *buf, size_t len) |
720b47f2 | 1123 | { |
4c36ddbe | 1124 | readfd(f,buf,len); |
720b47f2 AT |
1125 | } |
1126 | ||
4a19c3b2 | 1127 | void read_sbuf(int f, char *buf, size_t len) |
575f2fca | 1128 | { |
93095cbe | 1129 | readfd(f, buf, len); |
af436313 | 1130 | buf[len] = '\0'; |
575f2fca AT |
1131 | } |
1132 | ||
9361f839 | 1133 | uchar read_byte(int f) |
182dca5c | 1134 | { |
9361f839 | 1135 | uchar c; |
93095cbe | 1136 | readfd(f, (char *)&c, 1); |
4c36ddbe | 1137 | return c; |
182dca5c | 1138 | } |
720b47f2 | 1139 | |
46e99b09 WD |
1140 | int read_vstring(int f, char *buf, int bufsize) |
1141 | { | |
1142 | int len = read_byte(f); | |
1143 | ||
1144 | if (len & 0x80) | |
1145 | len = (len & ~0x80) * 0x100 + read_byte(f); | |
1146 | ||
1147 | if (len >= bufsize) { | |
1148 | rprintf(FERROR, "over-long vstring received (%d > %d)\n", | |
1149 | len, bufsize - 1); | |
9a6ed83f | 1150 | return -1; |
46e99b09 WD |
1151 | } |
1152 | ||
1153 | if (len) | |
1154 | readfd(f, buf, len); | |
1155 | buf[len] = '\0'; | |
1156 | return len; | |
1157 | } | |
1158 | ||
188fed95 WD |
1159 | /* Populate a sum_struct with values from the socket. This is |
1160 | * called by both the sender and the receiver. */ | |
1161 | void read_sum_head(int f, struct sum_struct *sum) | |
1162 | { | |
1163 | sum->count = read_int(f); | |
c638caa6 WD |
1164 | if (sum->count < 0) { |
1165 | rprintf(FERROR, "Invalid checksum count %ld [%s]\n", | |
1166 | (long)sum->count, who_am_i()); | |
1167 | exit_cleanup(RERR_PROTOCOL); | |
1168 | } | |
188fed95 WD |
1169 | sum->blength = read_int(f); |
1170 | if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { | |
cdf236aa WD |
1171 | rprintf(FERROR, "Invalid block length %ld [%s]\n", |
1172 | (long)sum->blength, who_am_i()); | |
188fed95 WD |
1173 | exit_cleanup(RERR_PROTOCOL); |
1174 | } | |
1175 | sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); | |
a0456b9c | 1176 | if (sum->s2length < 0 || sum->s2length > MAX_DIGEST_LEN) { |
cdf236aa WD |
1177 | rprintf(FERROR, "Invalid checksum length %d [%s]\n", |
1178 | sum->s2length, who_am_i()); | |
188fed95 WD |
1179 | exit_cleanup(RERR_PROTOCOL); |
1180 | } | |
1181 | sum->remainder = read_int(f); | |
1182 | if (sum->remainder < 0 || sum->remainder > sum->blength) { | |
cdf236aa WD |
1183 | rprintf(FERROR, "Invalid remainder length %ld [%s]\n", |
1184 | (long)sum->remainder, who_am_i()); | |
188fed95 WD |
1185 | exit_cleanup(RERR_PROTOCOL); |
1186 | } | |
1187 | } | |
1188 | ||
c207d7ec WD |
1189 | /* Send the values from a sum_struct over the socket. Set sum to |
1190 | * NULL if there are no checksums to send. This is called by both | |
1191 | * the generator and the sender. */ | |
1192 | void write_sum_head(int f, struct sum_struct *sum) | |
1193 | { | |
1194 | static struct sum_struct null_sum; | |
1195 | ||
1196 | if (sum == NULL) | |
1197 | sum = &null_sum; | |
1198 | ||
1199 | write_int(f, sum->count); | |
1200 | write_int(f, sum->blength); | |
1201 | if (protocol_version >= 27) | |
1202 | write_int(f, sum->s2length); | |
1203 | write_int(f, sum->remainder); | |
1204 | } | |
1205 | ||
08571358 MP |
1206 | /** |
1207 | * Sleep after writing to limit I/O bandwidth usage. | |
1208 | * | |
1209 | * @todo Rather than sleeping after each write, it might be better to | |
1210 | * use some kind of averaging. The current algorithm seems to always | |
1211 | * use a bit less bandwidth than specified, because it doesn't make up | |
1212 | * for slow periods. But arguably this is a feature. In addition, we | |
1213 | * ought to take the time used to write the data into account. | |
71e58630 WD |
1214 | * |
1215 | * During some phases of big transfers (file FOO is uptodate) this is | |
1216 | * called with a small bytes_written every time. As the kernel has to | |
1217 | * round small waits up to guarantee that we actually wait at least the | |
1218 | * requested number of microseconds, this can become grossly inaccurate. | |
1219 | * We therefore keep track of the bytes we've written over time and only | |
1220 | * sleep when the accumulated delay is at least 1 tenth of a second. | |
08571358 MP |
1221 | **/ |
1222 | static void sleep_for_bwlimit(int bytes_written) | |
1223 | { | |
71e58630 | 1224 | static struct timeval prior_tv; |
0f78b815 | 1225 | static long total_written = 0; |
71e58630 WD |
1226 | struct timeval tv, start_tv; |
1227 | long elapsed_usec, sleep_usec; | |
1228 | ||
1229 | #define ONE_SEC 1000000L /* # of microseconds in a second */ | |
08571358 | 1230 | |
9a0cfff5 | 1231 | if (!bwlimit_writemax) |
08571358 | 1232 | return; |
e681e820 | 1233 | |
0f78b815 | 1234 | total_written += bytes_written; |
71e58630 WD |
1235 | |
1236 | gettimeofday(&start_tv, NULL); | |
1237 | if (prior_tv.tv_sec) { | |
1238 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC | |
1239 | + (start_tv.tv_usec - prior_tv.tv_usec); | |
1240 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); | |
1241 | if (total_written < 0) | |
1242 | total_written = 0; | |
1243 | } | |
3151cbae | 1244 | |
71e58630 WD |
1245 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
1246 | if (sleep_usec < ONE_SEC / 10) { | |
1247 | prior_tv = start_tv; | |
1248 | return; | |
1249 | } | |
08571358 | 1250 | |
71e58630 WD |
1251 | tv.tv_sec = sleep_usec / ONE_SEC; |
1252 | tv.tv_usec = sleep_usec % ONE_SEC; | |
98b332ed | 1253 | select(0, NULL, NULL, NULL, &tv); |
71e58630 WD |
1254 | |
1255 | gettimeofday(&prior_tv, NULL); | |
1256 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC | |
1257 | + (prior_tv.tv_usec - start_tv.tv_usec); | |
1258 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); | |
08571358 MP |
1259 | } |
1260 | ||
1f75bb10 | 1261 | /* Write len bytes to the file descriptor fd, looping as necessary to get |
0fb2fc4a | 1262 | * the job done and also (in certain circumstances) reading any data on |
af436313 | 1263 | * msg_fd_in to avoid deadlock. |
880da007 MP |
1264 | * |
1265 | * This function underlies the multiplexing system. The body of the | |
1f75bb10 | 1266 | * application never calls this function directly. */ |
4a19c3b2 | 1267 | static void writefd_unbuffered(int fd, const char *buf, size_t len) |
720b47f2 | 1268 | { |
1ea087a7 | 1269 | size_t n, total = 0; |
6c850772 | 1270 | fd_set w_fds, r_fds, e_fds; |
d8aeda1e | 1271 | int maxfd, count, cnt, using_r_fds; |
e4c877cf | 1272 | int defer_inc = 0; |
8d9dc9f9 | 1273 | struct timeval tv; |
720b47f2 | 1274 | |
3be97bf9 | 1275 | if (no_flush++) |
e4c877cf | 1276 | defer_forwarding_messages++, defer_inc++; |
e44f9a12 | 1277 | |
4c36ddbe | 1278 | while (total < len) { |
8d9dc9f9 | 1279 | FD_ZERO(&w_fds); |
6c850772 WD |
1280 | FD_SET(fd, &w_fds); |
1281 | FD_ZERO(&e_fds); | |
1282 | FD_SET(fd, &e_fds); | |
1ea087a7 | 1283 | maxfd = fd; |
4c36ddbe | 1284 | |
954bbed8 | 1285 | if (msg_fd_in >= 0) { |
56014c8c | 1286 | FD_ZERO(&r_fds); |
6c850772 | 1287 | FD_SET(msg_fd_in, &r_fds); |
1ea087a7 WD |
1288 | if (msg_fd_in > maxfd) |
1289 | maxfd = msg_fd_in; | |
3eeac9bc WD |
1290 | using_r_fds = 1; |
1291 | } else | |
1292 | using_r_fds = 0; | |
8d9dc9f9 | 1293 | |
e626b29e | 1294 | tv.tv_sec = select_timeout; |
8d9dc9f9 | 1295 | tv.tv_usec = 0; |
4c36ddbe | 1296 | |
554e0a8d | 1297 | errno = 0; |
3eeac9bc | 1298 | count = select(maxfd + 1, using_r_fds ? &r_fds : NULL, |
6c850772 | 1299 | &w_fds, &e_fds, &tv); |
4c36ddbe AT |
1300 | |
1301 | if (count <= 0) { | |
1ea087a7 | 1302 | if (count < 0 && errno == EBADF) |
554e0a8d | 1303 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 1304 | check_timeout(); |
8d9dc9f9 AT |
1305 | continue; |
1306 | } | |
4c36ddbe | 1307 | |
6c850772 WD |
1308 | if (FD_ISSET(fd, &e_fds)) { |
1309 | rsyserr(FINFO, errno, | |
1310 | "select exception on fd %d", fd); | |
1311 | } | |
1312 | ||
3eeac9bc | 1313 | if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds)) |
d17e1dd2 | 1314 | read_msg_fd(); |
554e0a8d | 1315 | |
9a6ed83f | 1316 | if (!FD_ISSET(fd, &w_fds)) |
1ea087a7 | 1317 | continue; |
4c36ddbe | 1318 | |
1ea087a7 | 1319 | n = len - total; |
9a0cfff5 | 1320 | if (bwlimit_writemax && n > bwlimit_writemax) |
1ea087a7 | 1321 | n = bwlimit_writemax; |
d8aeda1e | 1322 | cnt = write(fd, buf + total, n); |
1ea087a7 | 1323 | |
d8aeda1e WD |
1324 | if (cnt <= 0) { |
1325 | if (cnt < 0) { | |
3309507d WD |
1326 | if (errno == EINTR) |
1327 | continue; | |
1328 | if (errno == EWOULDBLOCK || errno == EAGAIN) { | |
1329 | msleep(1); | |
1330 | continue; | |
1331 | } | |
f0359dd0 AT |
1332 | } |
1333 | ||
1ea087a7 | 1334 | /* Don't try to write errors back across the stream. */ |
1f75bb10 | 1335 | if (fd == sock_f_out) |
8ef246e0 | 1336 | io_end_multiplex_out(); |
2a5df862 WD |
1337 | /* Don't try to write errors down a failing msg pipe. */ |
1338 | if (am_server && fd == msg_fd_out) | |
1339 | exit_cleanup(RERR_STREAMIO); | |
1ea087a7 | 1340 | rsyserr(FERROR, errno, |
b88c2e8f WD |
1341 | "writefd_unbuffered failed to write %ld bytes [%s]", |
1342 | (long)len, who_am_i()); | |
d1b31da7 WD |
1343 | /* If the other side is sending us error messages, try |
1344 | * to grab any messages they sent before they died. */ | |
7f459268 | 1345 | while (fd == sock_f_out && io_multiplexing_in) { |
3b0a30eb | 1346 | set_io_timeout(30); |
9e2409ab | 1347 | ignore_timeout = 0; |
d1b31da7 WD |
1348 | readfd_unbuffered(sock_f_in, io_filesfrom_buf, |
1349 | sizeof io_filesfrom_buf); | |
1350 | } | |
1ea087a7 WD |
1351 | exit_cleanup(RERR_STREAMIO); |
1352 | } | |
4c36ddbe | 1353 | |
d8aeda1e | 1354 | total += cnt; |
e4c877cf | 1355 | defer_forwarding_messages++, defer_inc++; |
a800434a | 1356 | |
1f75bb10 | 1357 | if (fd == sock_f_out) { |
626bec8e | 1358 | if (io_timeout || am_generator) |
3b0a30eb | 1359 | last_io_out = time(NULL); |
d8aeda1e | 1360 | sleep_for_bwlimit(cnt); |
1f75bb10 | 1361 | } |
4c36ddbe | 1362 | } |
e44f9a12 AT |
1363 | |
1364 | no_flush--; | |
e4c877cf WD |
1365 | if (!(defer_forwarding_messages -= defer_inc)) |
1366 | msg_flush(); | |
d6dead6b AT |
1367 | } |
1368 | ||
dde5b772 | 1369 | void io_flush(int flush_it_all) |
d6dead6b | 1370 | { |
1f75bb10 | 1371 | if (!iobuf_out_cnt || no_flush) |
d17e1dd2 | 1372 | return; |
8d9dc9f9 | 1373 | |
d17e1dd2 | 1374 | if (io_multiplexing_out) |
3be97bf9 | 1375 | mplex_write(sock_f_out, MSG_DATA, iobuf_out, iobuf_out_cnt); |
d17e1dd2 | 1376 | else |
8ef246e0 | 1377 | writefd_unbuffered(iobuf_f_out, iobuf_out, iobuf_out_cnt); |
1f75bb10 | 1378 | iobuf_out_cnt = 0; |
e4c877cf WD |
1379 | |
1380 | if (flush_it_all && !defer_forwarding_messages) | |
1381 | msg_flush(); | |
8d9dc9f9 AT |
1382 | } |
1383 | ||
4a19c3b2 | 1384 | static void writefd(int fd, const char *buf, size_t len) |
d6dead6b | 1385 | { |
1f75bb10 WD |
1386 | if (fd == sock_f_out) |
1387 | stats.total_written += len; | |
1388 | ||
b9f592fb WD |
1389 | if (fd == write_batch_monitor_out) { |
1390 | if ((size_t)write(batch_fd, buf, len) != len) | |
1391 | exit_cleanup(RERR_FILEIO); | |
1392 | } | |
1393 | ||
8ef246e0 | 1394 | if (!iobuf_out || fd != iobuf_f_out) { |
4c36ddbe AT |
1395 | writefd_unbuffered(fd, buf, len); |
1396 | return; | |
1397 | } | |
d6dead6b AT |
1398 | |
1399 | while (len) { | |
1f75bb10 | 1400 | int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt); |
d6dead6b | 1401 | if (n > 0) { |
1f75bb10 | 1402 | memcpy(iobuf_out+iobuf_out_cnt, buf, n); |
d6dead6b AT |
1403 | buf += n; |
1404 | len -= n; | |
1f75bb10 | 1405 | iobuf_out_cnt += n; |
d6dead6b | 1406 | } |
3151cbae | 1407 | |
1f75bb10 | 1408 | if (iobuf_out_cnt == IO_BUFFER_SIZE) |
d17e1dd2 | 1409 | io_flush(NORMAL_FLUSH); |
d6dead6b | 1410 | } |
d6dead6b | 1411 | } |
720b47f2 | 1412 | |
3a993aa4 | 1413 | void write_shortint(int f, unsigned short x) |
9361f839 | 1414 | { |
3a993aa4 WD |
1415 | char b[2]; |
1416 | b[0] = (char)x; | |
1417 | b[1] = (char)(x >> 8); | |
1418 | writefd(f, b, 2); | |
9361f839 WD |
1419 | } |
1420 | ||
351e23ad WD |
1421 | void write_int(int f, int32 x) |
1422 | { | |
1423 | char b[4]; | |
1424 | SIVAL(b, 0, x); | |
1425 | writefd(f, b, 4); | |
1426 | } | |
1427 | ||
f31514ad | 1428 | void write_varint(int f, int32 x) |
1c3344a1 WD |
1429 | { |
1430 | char b[5]; | |
351e23ad WD |
1431 | uchar bit; |
1432 | int cnt = 4; | |
1433 | ||
1434 | SIVAL(b, 1, x); | |
1435 | ||
1436 | while (cnt > 1 && b[cnt] == 0) | |
1437 | cnt--; | |
1438 | bit = ((uchar)1<<(7-cnt+1)); | |
1439 | if (CVAL(b, cnt) >= bit) { | |
1440 | cnt++; | |
1441 | *b = ~(bit-1); | |
1442 | } else if (cnt > 1) | |
1443 | *b = b[cnt] | ~(bit*2-1); | |
1444 | else | |
1445 | *b = b[cnt]; | |
1446 | ||
1447 | writefd(f, b, cnt); | |
1c3344a1 WD |
1448 | } |
1449 | ||
351e23ad | 1450 | void write_varlong(int f, int64 x, uchar min_bytes) |
720b47f2 | 1451 | { |
351e23ad WD |
1452 | char b[9]; |
1453 | uchar bit; | |
1454 | int cnt = 8; | |
1455 | ||
1456 | SIVAL(b, 1, x); | |
1457 | #if SIZEOF_INT64 >= 8 | |
1458 | SIVAL(b, 5, x >> 32); | |
1459 | #else | |
1460 | if (x <= 0x7FFFFFFF && x >= 0) | |
1461 | memset(b + 5, 0, 4); | |
1462 | else { | |
1463 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1464 | exit_cleanup(RERR_UNSUPPORTED); | |
1465 | } | |
1466 | #endif | |
1467 | ||
1468 | while (cnt > min_bytes && b[cnt] == 0) | |
1469 | cnt--; | |
1470 | bit = ((uchar)1<<(7-cnt+min_bytes)); | |
1471 | if (CVAL(b, cnt) >= bit) { | |
1472 | cnt++; | |
1473 | *b = ~(bit-1); | |
1474 | } else if (cnt > min_bytes) | |
1475 | *b = b[cnt] | ~(bit*2-1); | |
1476 | else | |
1477 | *b = b[cnt]; | |
1478 | ||
1479 | writefd(f, b, cnt); | |
720b47f2 AT |
1480 | } |
1481 | ||
7a24c346 MP |
1482 | /* |
1483 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any | |
1484 | * 64-bit types on this platform. | |
1485 | */ | |
71c46176 | 1486 | void write_longint(int f, int64 x) |
3a6a366f | 1487 | { |
351e23ad | 1488 | char b[12], * const s = b+4; |
3a6a366f | 1489 | |
351e23ad WD |
1490 | SIVAL(s, 0, x); |
1491 | if (x <= 0x7FFFFFFF && x >= 0) { | |
482f48cc | 1492 | writefd(f, s, 4); |
351e23ad WD |
1493 | return; |
1494 | } | |
3a6a366f | 1495 | |
4ea4acf1 | 1496 | #if SIZEOF_INT64 < 8 |
351e23ad WD |
1497 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
1498 | exit_cleanup(RERR_UNSUPPORTED); | |
4ea4acf1 | 1499 | #else |
351e23ad WD |
1500 | memset(b, 0xFF, 4); |
1501 | SIVAL(s, 4, x >> 32); | |
1502 | writefd(f, b, 12); | |
4ea4acf1 | 1503 | #endif |
3a6a366f AT |
1504 | } |
1505 | ||
4a19c3b2 | 1506 | void write_buf(int f, const char *buf, size_t len) |
720b47f2 | 1507 | { |
4c36ddbe | 1508 | writefd(f,buf,len); |
720b47f2 AT |
1509 | } |
1510 | ||
880da007 | 1511 | /** Write a string to the connection */ |
4a19c3b2 | 1512 | void write_sbuf(int f, const char *buf) |
f0fca04e | 1513 | { |
93095cbe | 1514 | writefd(f, buf, strlen(buf)); |
f0fca04e AT |
1515 | } |
1516 | ||
9361f839 | 1517 | void write_byte(int f, uchar c) |
182dca5c | 1518 | { |
93095cbe | 1519 | writefd(f, (char *)&c, 1); |
182dca5c AT |
1520 | } |
1521 | ||
4a19c3b2 | 1522 | void write_vstring(int f, const char *str, int len) |
46e99b09 WD |
1523 | { |
1524 | uchar lenbuf[3], *lb = lenbuf; | |
1525 | ||
1526 | if (len > 0x7F) { | |
1527 | if (len > 0x7FFF) { | |
1528 | rprintf(FERROR, | |
1529 | "attempting to send over-long vstring (%d > %d)\n", | |
1530 | len, 0x7FFF); | |
1531 | exit_cleanup(RERR_PROTOCOL); | |
1532 | } | |
1533 | *lb++ = len / 0x100 + 0x80; | |
1534 | } | |
1535 | *lb = len; | |
1536 | ||
1537 | writefd(f, (char*)lenbuf, lb - lenbuf + 1); | |
1538 | if (len) | |
1539 | writefd(f, str, len); | |
1540 | } | |
1541 | ||
8a65e0ce WD |
1542 | /* Send a file-list index using a byte-reduction method. */ |
1543 | void write_ndx(int f, int32 ndx) | |
1544 | { | |
1545 | static int32 prev_positive = -1, prev_negative = 1; | |
1546 | int32 diff, cnt = 0; | |
1547 | char b[6]; | |
1548 | ||
1549 | if (protocol_version < 30 || read_batch) { | |
1550 | write_int(f, ndx); | |
1551 | return; | |
1552 | } | |
1553 | ||
1554 | /* Send NDX_DONE as a single-byte 0 with no side effects. Send | |
1555 | * negative nums as a positive after sending a leading 0xFF. */ | |
1556 | if (ndx >= 0) { | |
1557 | diff = ndx - prev_positive; | |
1558 | prev_positive = ndx; | |
1559 | } else if (ndx == NDX_DONE) { | |
1560 | *b = 0; | |
1561 | writefd(f, b, 1); | |
1562 | return; | |
1563 | } else { | |
1564 | b[cnt++] = (char)0xFF; | |
1565 | ndx = -ndx; | |
1566 | diff = ndx - prev_negative; | |
1567 | prev_negative = ndx; | |
1568 | } | |
1569 | ||
1570 | /* A diff of 1 - 253 is sent as a one-byte diff; a diff of 254 - 32767 | |
1571 | * or 0 is sent as a 0xFE + a two-byte diff; otherwise we send 0xFE | |
1572 | * & all 4 bytes of the (non-negative) num with the high-bit set. */ | |
1573 | if (diff < 0xFE && diff > 0) | |
1574 | b[cnt++] = (char)diff; | |
1575 | else if (diff < 0 || diff > 0x7FFF) { | |
1576 | b[cnt++] = (char)0xFE; | |
1577 | b[cnt++] = (char)((ndx >> 24) | 0x80); | |
8a65e0ce | 1578 | b[cnt++] = (char)ndx; |
351e23ad WD |
1579 | b[cnt++] = (char)(ndx >> 8); |
1580 | b[cnt++] = (char)(ndx >> 16); | |
8a65e0ce WD |
1581 | } else { |
1582 | b[cnt++] = (char)0xFE; | |
1583 | b[cnt++] = (char)(diff >> 8); | |
1584 | b[cnt++] = (char)diff; | |
1585 | } | |
1586 | writefd(f, b, cnt); | |
1587 | } | |
1588 | ||
1589 | /* Receive a file-list index using a byte-reduction method. */ | |
1590 | int32 read_ndx(int f) | |
1591 | { | |
1592 | static int32 prev_positive = -1, prev_negative = 1; | |
1593 | int32 *prev_ptr, num; | |
1594 | char b[4]; | |
1595 | ||
1596 | if (protocol_version < 30) | |
1597 | return read_int(f); | |
1598 | ||
1599 | readfd(f, b, 1); | |
1600 | if (CVAL(b, 0) == 0xFF) { | |
1601 | readfd(f, b, 1); | |
1602 | prev_ptr = &prev_negative; | |
1603 | } else if (CVAL(b, 0) == 0) | |
1604 | return NDX_DONE; | |
1605 | else | |
1606 | prev_ptr = &prev_positive; | |
1607 | if (CVAL(b, 0) == 0xFE) { | |
1608 | readfd(f, b, 2); | |
1609 | if (CVAL(b, 0) & 0x80) { | |
351e23ad WD |
1610 | b[3] = CVAL(b, 0) & ~0x80; |
1611 | b[0] = b[1]; | |
1612 | readfd(f, b+1, 2); | |
1613 | num = IVAL(b, 0); | |
8a65e0ce | 1614 | } else |
351e23ad | 1615 | num = (UVAL(b,0)<<8) + UVAL(b,1) + *prev_ptr; |
8a65e0ce | 1616 | } else |
351e23ad | 1617 | num = UVAL(b, 0) + *prev_ptr; |
8a65e0ce WD |
1618 | *prev_ptr = num; |
1619 | if (prev_ptr == &prev_negative) | |
1620 | num = -num; | |
1621 | return num; | |
1622 | } | |
1623 | ||
914cc65c | 1624 | /** |
6ed6d7f5 WD |
1625 | * Read a line of up to @p maxlen characters into @p buf (not counting |
1626 | * the trailing null). Strips the (required) trailing newline and all | |
1627 | * carriage returns. | |
914cc65c | 1628 | * |
6ed6d7f5 | 1629 | * @return 1 for success; 0 for I/O error or truncation. |
914cc65c | 1630 | **/ |
9dd891bb | 1631 | int read_line(int f, char *buf, size_t maxlen) |
f0fca04e AT |
1632 | { |
1633 | while (maxlen) { | |
528bfcd7 | 1634 | buf[0] = 0; |
f0fca04e | 1635 | read_buf(f, buf, 1); |
914cc65c MP |
1636 | if (buf[0] == 0) |
1637 | return 0; | |
6ed6d7f5 | 1638 | if (buf[0] == '\n') |
f0fca04e | 1639 | break; |
f0fca04e AT |
1640 | if (buf[0] != '\r') { |
1641 | buf++; | |
1642 | maxlen--; | |
1643 | } | |
1644 | } | |
6ed6d7f5 WD |
1645 | *buf = '\0'; |
1646 | return maxlen > 0; | |
f0fca04e AT |
1647 | } |
1648 | ||
f0fca04e AT |
1649 | void io_printf(int fd, const char *format, ...) |
1650 | { | |
d62bcc17 | 1651 | va_list ap; |
33544bf4 | 1652 | char buf[BIGPATHBUFLEN]; |
f0fca04e | 1653 | int len; |
3151cbae | 1654 | |
f0fca04e | 1655 | va_start(ap, format); |
3151cbae | 1656 | len = vsnprintf(buf, sizeof buf, format, ap); |
f0fca04e AT |
1657 | va_end(ap); |
1658 | ||
f89b9368 WD |
1659 | if (len < 0) |
1660 | exit_cleanup(RERR_STREAMIO); | |
f0fca04e | 1661 | |
33544bf4 WD |
1662 | if (len > (int)sizeof buf) { |
1663 | rprintf(FERROR, "io_printf() was too long for the buffer.\n"); | |
1664 | exit_cleanup(RERR_STREAMIO); | |
1665 | } | |
1666 | ||
f0fca04e AT |
1667 | write_sbuf(fd, buf); |
1668 | } | |
8d9dc9f9 | 1669 | |
d17e1dd2 | 1670 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1671 | void io_start_multiplex_out(void) |
8d9dc9f9 | 1672 | { |
d17e1dd2 | 1673 | io_flush(NORMAL_FLUSH); |
8ef246e0 | 1674 | io_start_buffering_out(sock_f_out); |
8d9dc9f9 AT |
1675 | io_multiplexing_out = 1; |
1676 | } | |
1677 | ||
d17e1dd2 | 1678 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1679 | void io_start_multiplex_in(void) |
8d9dc9f9 | 1680 | { |
d17e1dd2 | 1681 | io_flush(NORMAL_FLUSH); |
8ef246e0 | 1682 | io_start_buffering_in(sock_f_in); |
8d9dc9f9 AT |
1683 | io_multiplexing_in = 1; |
1684 | } | |
1685 | ||
d17e1dd2 | 1686 | /** Write an message to the multiplexed data stream. */ |
4a19c3b2 | 1687 | int io_multiplex_write(enum msgcode code, const char *buf, size_t len) |
8d9dc9f9 | 1688 | { |
f89b9368 WD |
1689 | if (!io_multiplexing_out) |
1690 | return 0; | |
d17e1dd2 | 1691 | io_flush(NORMAL_FLUSH); |
1b7c47cb | 1692 | stats.total_written += (len+4); |
3be97bf9 | 1693 | mplex_write(sock_f_out, code, buf, len); |
8d9dc9f9 AT |
1694 | return 1; |
1695 | } | |
1696 | ||
8ef246e0 | 1697 | void io_end_multiplex_in(void) |
7f459268 WD |
1698 | { |
1699 | io_multiplexing_in = 0; | |
8ef246e0 | 1700 | io_end_buffering_in(); |
7f459268 WD |
1701 | } |
1702 | ||
d17e1dd2 | 1703 | /** Stop output multiplexing. */ |
8ef246e0 | 1704 | void io_end_multiplex_out(void) |
554e0a8d AT |
1705 | { |
1706 | io_multiplexing_out = 0; | |
8ef246e0 | 1707 | io_end_buffering_out(); |
554e0a8d AT |
1708 | } |
1709 | ||
b9f592fb WD |
1710 | void start_write_batch(int fd) |
1711 | { | |
1712 | /* Some communication has already taken place, but we don't | |
1713 | * enable batch writing until here so that we can write a | |
1714 | * canonical record of the communication even though the | |
1715 | * actual communication so far depends on whether a daemon | |
1716 | * is involved. */ | |
1717 | write_int(batch_fd, protocol_version); | |
1718 | write_int(batch_fd, checksum_seed); | |
b9f592fb WD |
1719 | |
1720 | if (am_sender) | |
1721 | write_batch_monitor_out = fd; | |
1722 | else | |
1723 | write_batch_monitor_in = fd; | |
1724 | } | |
1725 | ||
1726 | void stop_write_batch(void) | |
1727 | { | |
1728 | write_batch_monitor_out = -1; | |
1729 | write_batch_monitor_in = -1; | |
1730 | } |