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> | |
7 | * Copyright (C) 2003, 2004, 2005, 2006 Wayne Davison | |
d62bcc17 | 8 | * |
880da007 MP |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
d62bcc17 | 13 | * |
880da007 MP |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
d62bcc17 | 18 | * |
e7c67065 WD |
19 | * You should have received a copy of the GNU General Public License along |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
880da007 | 22 | */ |
720b47f2 | 23 | |
0f78b815 WD |
24 | /* Rsync provides its own multiplexing system, which is used to send |
25 | * stderr and stdout over a single socket. | |
87ee2481 MP |
26 | * |
27 | * For historical reasons this is off during the start of the | |
28 | * connection, but it's switched on quite early using | |
0f78b815 | 29 | * io_start_multiplex_out() and io_start_multiplex_in(). */ |
720b47f2 | 30 | |
720b47f2 AT |
31 | #include "rsync.h" |
32 | ||
880da007 | 33 | /** If no timeout is specified then use a 60 second select timeout */ |
8cd9fd4e AT |
34 | #define SELECT_TIMEOUT 60 |
35 | ||
7a55d06e | 36 | extern int bwlimit; |
71e58630 | 37 | extern size_t bwlimit_writemax; |
6ba9279f | 38 | extern int io_timeout; |
cdf236aa | 39 | extern int allowed_lull; |
d17e1dd2 WD |
40 | extern int am_server; |
41 | extern int am_daemon; | |
42 | extern int am_sender; | |
98f8c9a5 | 43 | extern int am_generator; |
8ef246e0 WD |
44 | extern int incremental; |
45 | extern int io_error; | |
e626b29e | 46 | extern int eol_nulls; |
8ef246e0 | 47 | extern int flist_eof; |
3b0a30eb | 48 | extern int read_batch; |
188fed95 | 49 | extern int csum_length; |
b9f592fb WD |
50 | extern int checksum_seed; |
51 | extern int protocol_version; | |
47c11975 | 52 | extern int remove_source_files; |
cdf236aa | 53 | extern int preserve_hard_links; |
d19320fd | 54 | extern char *filesfrom_host; |
a800434a | 55 | extern struct stats stats; |
8ef246e0 | 56 | extern struct file_list *cur_flist, *first_flist; |
720b47f2 | 57 | |
a86179f4 | 58 | const char phase_unknown[] = "unknown"; |
9e2409ab | 59 | int ignore_timeout = 0; |
b9f592fb | 60 | int batch_fd = -1; |
8ef246e0 | 61 | int done_cnt = 0; |
805edf9d | 62 | |
cb2e1f18 | 63 | /* Ignore an EOF error if non-zero. See whine_about_eof(). */ |
574c2500 | 64 | int kluge_around_eof = 0; |
7a55d06e | 65 | |
d17e1dd2 WD |
66 | int msg_fd_in = -1; |
67 | int msg_fd_out = -1; | |
cdf236aa WD |
68 | int sock_f_in = -1; |
69 | int sock_f_out = -1; | |
7a55d06e | 70 | |
8ef246e0 WD |
71 | static int iobuf_f_in = -1; |
72 | static char *iobuf_in; | |
73 | static size_t iobuf_in_siz; | |
74 | static size_t iobuf_in_ndx; | |
75 | static size_t iobuf_in_remaining; | |
76 | ||
77 | static int iobuf_f_out = -1; | |
78 | static char *iobuf_out; | |
79 | static int iobuf_out_cnt; | |
80 | ||
81 | int flist_forward_from = -1; | |
82 | ||
1f75bb10 WD |
83 | static int io_multiplexing_out; |
84 | static int io_multiplexing_in; | |
3b0a30eb WD |
85 | static time_t last_io_in; |
86 | static time_t last_io_out; | |
1f75bb10 WD |
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; | |
954bbed8 | 98 | static int defer_forwarding_messages = 0; |
3b0a30eb | 99 | static int select_timeout = SELECT_TIMEOUT; |
d6081c82 WD |
100 | static int active_filecnt = 0; |
101 | static OFF_T active_bytecnt = 0; | |
720b47f2 | 102 | |
c09af06d WD |
103 | static char int_byte_cnt[64] = { |
104 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* (00 - 3F)/4 */ | |
105 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* (40 - 7F)/4 */ | |
106 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, /* (80 - BF)/4 */ | |
107 | 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 8, 9, /* (C0 - FF)/4 */ | |
482f48cc WD |
108 | }; |
109 | ||
dde5b772 | 110 | static void readfd(int fd, char *buffer, size_t N); |
8ef246e0 WD |
111 | static void writefd(int fd, const char *buf, size_t len); |
112 | static void writefd_unbuffered(int fd, const char *buf, size_t len); | |
113 | static void decrement_active_files(int ndx); | |
114 | static void decrement_flist_in_progress(int ndx, int redo); | |
ff41a59f | 115 | |
c6816b94 WD |
116 | struct flist_ndx_item { |
117 | struct flist_ndx_item *next; | |
118 | int ndx; | |
d17e1dd2 WD |
119 | }; |
120 | ||
c6816b94 WD |
121 | struct flist_ndx_list { |
122 | struct flist_ndx_item *head, *tail; | |
123 | }; | |
124 | ||
cdf236aa | 125 | static struct flist_ndx_list redo_list, hlink_list; |
d17e1dd2 | 126 | |
08c88178 WD |
127 | struct msg_list_item { |
128 | struct msg_list_item *next; | |
d17e1dd2 | 129 | int len; |
954bbed8 | 130 | char buf[1]; |
d17e1dd2 WD |
131 | }; |
132 | ||
08c88178 WD |
133 | struct msg_list { |
134 | struct msg_list_item *head, *tail; | |
135 | }; | |
136 | ||
3be97bf9 | 137 | static struct msg_list msg2sndr; |
d17e1dd2 | 138 | |
c6816b94 | 139 | static void flist_ndx_push(struct flist_ndx_list *lp, int ndx) |
d17e1dd2 | 140 | { |
c6816b94 WD |
141 | struct flist_ndx_item *item; |
142 | ||
143 | if (!(item = new(struct flist_ndx_item))) | |
144 | out_of_memory("flist_ndx_push"); | |
145 | item->next = NULL; | |
146 | item->ndx = ndx; | |
147 | if (lp->tail) | |
148 | lp->tail->next = item; | |
d17e1dd2 | 149 | else |
c6816b94 WD |
150 | lp->head = item; |
151 | lp->tail = item; | |
152 | } | |
153 | ||
154 | static int flist_ndx_pop(struct flist_ndx_list *lp) | |
155 | { | |
156 | struct flist_ndx_item *next; | |
157 | int ndx; | |
158 | ||
159 | if (!lp->head) | |
160 | return -1; | |
161 | ||
162 | ndx = lp->head->ndx; | |
163 | next = lp->head->next; | |
164 | free(lp->head); | |
165 | lp->head = next; | |
166 | if (!next) | |
167 | lp->tail = NULL; | |
168 | ||
169 | return ndx; | |
d17e1dd2 WD |
170 | } |
171 | ||
8d9dc9f9 AT |
172 | static void check_timeout(void) |
173 | { | |
174 | time_t t; | |
90ba34e2 | 175 | |
9e2409ab | 176 | if (!io_timeout || ignore_timeout) |
d17e1dd2 | 177 | return; |
8d9dc9f9 | 178 | |
3b0a30eb WD |
179 | if (!last_io_in) { |
180 | last_io_in = time(NULL); | |
8d9dc9f9 AT |
181 | return; |
182 | } | |
183 | ||
184 | t = time(NULL); | |
185 | ||
3b0a30eb | 186 | if (t - last_io_in >= io_timeout) { |
0adb99b9 | 187 | if (!am_server && !am_daemon) { |
4ccfd96c | 188 | rprintf(FERROR, "io timeout after %d seconds -- exiting\n", |
3b0a30eb | 189 | (int)(t-last_io_in)); |
0adb99b9 | 190 | } |
65417579 | 191 | exit_cleanup(RERR_TIMEOUT); |
8d9dc9f9 AT |
192 | } |
193 | } | |
194 | ||
1f75bb10 WD |
195 | /* Note the fds used for the main socket (which might really be a pipe |
196 | * for a local transfer, but we can ignore that). */ | |
197 | void io_set_sock_fds(int f_in, int f_out) | |
198 | { | |
199 | sock_f_in = f_in; | |
200 | sock_f_out = f_out; | |
201 | } | |
202 | ||
3b0a30eb WD |
203 | void set_io_timeout(int secs) |
204 | { | |
205 | io_timeout = secs; | |
206 | ||
207 | if (!io_timeout || io_timeout > SELECT_TIMEOUT) | |
208 | select_timeout = SELECT_TIMEOUT; | |
209 | else | |
210 | select_timeout = io_timeout; | |
211 | ||
212 | allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2; | |
213 | } | |
214 | ||
98f8c9a5 WD |
215 | /* Setup the fd used to receive MSG_* messages. Only needed during the |
216 | * early stages of being a local sender (up through the sending of the | |
217 | * file list) or when we're the generator (to fetch the messages from | |
218 | * the receiver). */ | |
d17e1dd2 WD |
219 | void set_msg_fd_in(int fd) |
220 | { | |
221 | msg_fd_in = fd; | |
222 | } | |
223 | ||
98f8c9a5 WD |
224 | /* Setup the fd used to send our MSG_* messages. Only needed when |
225 | * we're the receiver (to send our messages to the generator). */ | |
d17e1dd2 WD |
226 | void set_msg_fd_out(int fd) |
227 | { | |
228 | msg_fd_out = fd; | |
229 | set_nonblocking(msg_fd_out); | |
230 | } | |
231 | ||
232 | /* Add a message to the pending MSG_* list. */ | |
4a19c3b2 | 233 | static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len) |
554e0a8d | 234 | { |
954bbed8 WD |
235 | struct msg_list_item *m; |
236 | int sz = len + 4 + sizeof m[0] - 1; | |
d17e1dd2 | 237 | |
954bbed8 | 238 | if (!(m = (struct msg_list_item *)new_array(char, sz))) |
c6816b94 | 239 | out_of_memory("msg_list_add"); |
954bbed8 WD |
240 | m->next = NULL; |
241 | m->len = len + 4; | |
242 | SIVAL(m->buf, 0, ((code+MPLEX_BASE)<<24) | len); | |
243 | memcpy(m->buf + 4, buf, len); | |
244 | if (lst->tail) | |
245 | lst->tail->next = m; | |
d17e1dd2 | 246 | else |
954bbed8 WD |
247 | lst->head = m; |
248 | lst->tail = m; | |
554e0a8d AT |
249 | } |
250 | ||
3be97bf9 WD |
251 | static void msg2sndr_flush(void) |
252 | { | |
253 | while (msg2sndr.head && io_multiplexing_out) { | |
254 | struct msg_list_item *m = msg2sndr.head; | |
255 | if (!(msg2sndr.head = m->next)) | |
256 | msg2sndr.tail = NULL; | |
257 | stats.total_written += m->len; | |
258 | defer_forwarding_messages = 1; | |
259 | writefd_unbuffered(sock_f_out, m->buf, m->len); | |
260 | defer_forwarding_messages = 0; | |
261 | free(m); | |
262 | } | |
263 | } | |
264 | ||
98f8c9a5 WD |
265 | /* Read a message from the MSG_* fd and handle it. This is called either |
266 | * during the early stages of being a local sender (up through the sending | |
267 | * of the file list) or when we're the generator (to fetch the messages | |
268 | * from the receiver). */ | |
d17e1dd2 | 269 | static void read_msg_fd(void) |
554e0a8d | 270 | { |
f9c6b3e7 | 271 | char buf[2048]; |
06ce139f | 272 | size_t n; |
8ef246e0 | 273 | struct file_list *flist; |
d17e1dd2 | 274 | int fd = msg_fd_in; |
ff41a59f AT |
275 | int tag, len; |
276 | ||
00bdf899 | 277 | /* Temporarily disable msg_fd_in. This is needed to avoid looping back |
af436313 | 278 | * to this routine from writefd_unbuffered(). */ |
3be97bf9 | 279 | no_flush++; |
d17e1dd2 | 280 | msg_fd_in = -1; |
be21e29c | 281 | defer_forwarding_messages++; |
554e0a8d | 282 | |
dde5b772 | 283 | readfd(fd, buf, 4); |
ff41a59f AT |
284 | tag = IVAL(buf, 0); |
285 | ||
286 | len = tag & 0xFFFFFF; | |
d17e1dd2 | 287 | tag = (tag >> 24) - MPLEX_BASE; |
ff41a59f | 288 | |
d17e1dd2 WD |
289 | switch (tag) { |
290 | case MSG_DONE: | |
98f8c9a5 | 291 | if (len != 0 || !am_generator) { |
8ef246e0 WD |
292 | invalid_msg: |
293 | rprintf(FERROR, "invalid message %d:%d [%s%s]\n", | |
294 | tag, len, who_am_i(), | |
295 | incremental ? "/incremental" : ""); | |
d17e1dd2 | 296 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 297 | } |
8ef246e0 | 298 | done_cnt++; |
d17e1dd2 WD |
299 | break; |
300 | case MSG_REDO: | |
8ef246e0 WD |
301 | if (len != 4 || !am_generator) |
302 | goto invalid_msg; | |
dde5b772 | 303 | readfd(fd, buf, 4); |
47c11975 | 304 | if (remove_source_files) |
d6081c82 | 305 | decrement_active_files(IVAL(buf,0)); |
c6816b94 | 306 | flist_ndx_push(&redo_list, IVAL(buf,0)); |
8ef246e0 WD |
307 | if (incremental) |
308 | decrement_flist_in_progress(IVAL(buf,0), 1); | |
309 | break; | |
310 | case MSG_FLIST: | |
311 | if (len != 4 || !am_generator || !incremental) | |
312 | goto invalid_msg; | |
dde5b772 | 313 | readfd(fd, buf, 4); |
8ef246e0 WD |
314 | /* Read extra file list from receiver. */ |
315 | assert(iobuf_in != NULL); | |
316 | assert(iobuf_f_in == fd); | |
317 | flist = recv_file_list(fd); | |
318 | flist->parent_ndx = IVAL(buf,0); | |
319 | break; | |
320 | case MSG_FLIST_EOF: | |
321 | if (len != 0 || !am_generator || !incremental) | |
322 | goto invalid_msg; | |
323 | flist_eof = 1; | |
d17e1dd2 | 324 | break; |
0d67e00a | 325 | case MSG_DELETED: |
8ef246e0 WD |
326 | if (len >= (int)sizeof buf || !am_generator) |
327 | goto invalid_msg; | |
dde5b772 | 328 | readfd(fd, buf, len); |
12ccc73a | 329 | send_msg(MSG_DELETED, buf, len); |
0d67e00a | 330 | break; |
9981c27e | 331 | case MSG_SUCCESS: |
8ef246e0 WD |
332 | if (len != 4 || !am_generator) |
333 | goto invalid_msg; | |
dde5b772 | 334 | readfd(fd, buf, len); |
47c11975 | 335 | if (remove_source_files) { |
d6081c82 | 336 | decrement_active_files(IVAL(buf,0)); |
12ccc73a | 337 | send_msg(MSG_SUCCESS, buf, len); |
d6081c82 | 338 | } |
cdf236aa WD |
339 | if (preserve_hard_links) |
340 | flist_ndx_push(&hlink_list, IVAL(buf,0)); | |
8ef246e0 WD |
341 | if (incremental) |
342 | decrement_flist_in_progress(IVAL(buf,0), 0); | |
343 | break; | |
344 | case MSG_NO_SEND: | |
345 | if (len != 4 || !am_generator) | |
346 | goto invalid_msg; | |
dde5b772 | 347 | readfd(fd, buf, len); |
8ef246e0 WD |
348 | if (incremental) |
349 | decrement_flist_in_progress(IVAL(buf,0), 0); | |
9981c27e | 350 | break; |
72f2d1b3 | 351 | case MSG_SOCKERR: |
64119c79 | 352 | case MSG_CLIENT: |
8ef246e0 WD |
353 | if (!am_generator) |
354 | goto invalid_msg; | |
64119c79 | 355 | if (tag == MSG_SOCKERR) |
8ef246e0 | 356 | io_end_multiplex_out(); |
72f2d1b3 | 357 | /* FALL THROUGH */ |
d17e1dd2 WD |
358 | case MSG_INFO: |
359 | case MSG_ERROR: | |
360 | case MSG_LOG: | |
361 | while (len) { | |
362 | n = len; | |
363 | if (n >= sizeof buf) | |
364 | n = sizeof buf - 1; | |
dde5b772 | 365 | readfd(fd, buf, n); |
54b0dfa0 | 366 | rwrite((enum logcode)tag, buf, n); |
d17e1dd2 WD |
367 | len -= n; |
368 | } | |
369 | break; | |
370 | default: | |
f8b9da1a WD |
371 | rprintf(FERROR, "unknown message %d:%d [%s]\n", |
372 | tag, len, who_am_i()); | |
d17e1dd2 WD |
373 | exit_cleanup(RERR_STREAMIO); |
374 | } | |
375 | ||
3be97bf9 | 376 | no_flush--; |
d17e1dd2 | 377 | msg_fd_in = fd; |
3be97bf9 WD |
378 | if (!--defer_forwarding_messages) |
379 | msg2sndr_flush(); | |
d17e1dd2 WD |
380 | } |
381 | ||
d6081c82 | 382 | /* This is used by the generator to limit how many file transfers can |
47c11975 | 383 | * be active at once when --remove-source-files is specified. Without |
d6081c82 WD |
384 | * this, sender-side deletions were mostly happening at the end. */ |
385 | void increment_active_files(int ndx, int itemizing, enum logcode code) | |
386 | { | |
387 | /* TODO: tune these limits? */ | |
5b986297 | 388 | while (active_filecnt >= (active_bytecnt >= 128*1024 ? 10 : 50)) { |
1e1ca253 | 389 | #ifdef SUPPORT_HARD_LINKS |
d6081c82 WD |
390 | if (hlink_list.head) |
391 | check_for_finished_hlinks(itemizing, code); | |
1e1ca253 | 392 | #endif |
3be97bf9 | 393 | io_flush(NORMAL_FLUSH); |
d6081c82 WD |
394 | read_msg_fd(); |
395 | } | |
396 | ||
397 | active_filecnt++; | |
8ef246e0 | 398 | active_bytecnt += F_LENGTH(cur_flist->files[ndx]); |
d6081c82 WD |
399 | } |
400 | ||
8ef246e0 | 401 | static void decrement_active_files(int ndx) |
d6081c82 | 402 | { |
8ef246e0 WD |
403 | struct file_list *flist = flist_for_ndx(ndx); |
404 | assert(flist != NULL); | |
d6081c82 | 405 | active_filecnt--; |
8ef246e0 WD |
406 | active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]); |
407 | } | |
408 | ||
409 | static void decrement_flist_in_progress(int ndx, int redo) | |
410 | { | |
411 | struct file_list *flist = cur_flist ? cur_flist : first_flist; | |
412 | ||
413 | while (ndx < flist->ndx_start) { | |
414 | if (flist == first_flist) { | |
415 | invalid_ndx: | |
416 | rprintf(FERROR, | |
417 | "Invalid file index: %d (%d - %d) [%s]\n", | |
418 | ndx, first_flist->ndx_start, | |
419 | first_flist->prev->ndx_start + first_flist->prev->count - 1, | |
420 | who_am_i()); | |
421 | exit_cleanup(RERR_PROTOCOL); | |
422 | } | |
423 | flist = flist->prev; | |
424 | } | |
425 | while (ndx >= flist->ndx_start + flist->count) { | |
426 | if (!(flist = flist->next)) | |
427 | goto invalid_ndx; | |
428 | } | |
429 | ||
430 | flist->in_progress--; | |
431 | if (redo) | |
432 | flist->to_redo++; | |
d6081c82 WD |
433 | } |
434 | ||
3be97bf9 WD |
435 | /* Write an message to a multiplexed stream. If this fails, rsync exits. */ |
436 | static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len) | |
d17e1dd2 | 437 | { |
3be97bf9 WD |
438 | char buffer[1024]; |
439 | size_t n = len; | |
d17e1dd2 | 440 | |
3be97bf9 WD |
441 | SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); |
442 | ||
443 | if (n > sizeof buffer - 4) | |
444 | n = 0; | |
445 | else | |
446 | memcpy(buffer + 4, buf, n); | |
447 | ||
448 | writefd_unbuffered(fd, buffer, n+4); | |
449 | ||
450 | len -= n; | |
451 | buf += n; | |
452 | ||
453 | if (len) { | |
454 | defer_forwarding_messages++; | |
455 | writefd_unbuffered(fd, buf, len); | |
456 | if (!--defer_forwarding_messages) | |
457 | msg2sndr_flush(); | |
8ef246e0 | 458 | } |
d17e1dd2 WD |
459 | } |
460 | ||
4a19c3b2 | 461 | int send_msg(enum msgcode code, const char *buf, int len) |
37f35d89 WD |
462 | { |
463 | if (msg_fd_out < 0) { | |
12ccc73a WD |
464 | if (!defer_forwarding_messages) |
465 | return io_multiplex_write(code, buf, len); | |
466 | if (!io_multiplexing_out) | |
467 | return 0; | |
468 | msg_list_add(&msg2sndr, code, buf, len); | |
469 | return 1; | |
37f35d89 | 470 | } |
3be97bf9 | 471 | mplex_write(msg_fd_out, code, buf, len); |
12ccc73a | 472 | return 1; |
37f35d89 WD |
473 | } |
474 | ||
155d9206 WD |
475 | void send_msg_int(enum msgcode code, int num) |
476 | { | |
477 | char numbuf[4]; | |
478 | SIVAL(numbuf, 0, num); | |
479 | send_msg(code, numbuf, 4); | |
480 | } | |
481 | ||
8ef246e0 | 482 | void wait_for_receiver(void) |
d17e1dd2 | 483 | { |
3be97bf9 | 484 | io_flush(NORMAL_FLUSH); |
8ef246e0 WD |
485 | read_msg_fd(); |
486 | } | |
554e0a8d | 487 | |
8ef246e0 WD |
488 | int get_redo_num(void) |
489 | { | |
c6816b94 | 490 | return flist_ndx_pop(&redo_list); |
554e0a8d AT |
491 | } |
492 | ||
cdf236aa WD |
493 | int get_hlink_num(void) |
494 | { | |
495 | return flist_ndx_pop(&hlink_list); | |
496 | } | |
497 | ||
56014c8c WD |
498 | /** |
499 | * When we're the receiver and we have a local --files-from list of names | |
500 | * that needs to be sent over the socket to the sender, we have to do two | |
501 | * things at the same time: send the sender a list of what files we're | |
502 | * processing and read the incoming file+info list from the sender. We do | |
503 | * this by augmenting the read_timeout() function to copy this data. It | |
504 | * uses the io_filesfrom_buf to read a block of data from f_in (when it is | |
505 | * ready, since it might be a pipe) and then blast it out f_out (when it | |
506 | * is ready to receive more data). | |
507 | */ | |
508 | void io_set_filesfrom_fds(int f_in, int f_out) | |
509 | { | |
510 | io_filesfrom_f_in = f_in; | |
511 | io_filesfrom_f_out = f_out; | |
512 | io_filesfrom_bp = io_filesfrom_buf; | |
513 | io_filesfrom_lastchar = '\0'; | |
514 | io_filesfrom_buflen = 0; | |
515 | } | |
720b47f2 | 516 | |
cb2e1f18 WD |
517 | /* It's almost always an error to get an EOF when we're trying to read from the |
518 | * network, because the protocol is (for the most part) self-terminating. | |
880da007 | 519 | * |
cb2e1f18 WD |
520 | * There is one case for the receiver when it is at the end of the transfer |
521 | * (hanging around reading any keep-alive packets that might come its way): if | |
522 | * the sender dies before the generator's kill-signal comes through, we can end | |
523 | * up here needing to loop until the kill-signal arrives. In this situation, | |
524 | * kluge_around_eof will be < 0. | |
525 | * | |
526 | * There is another case for older protocol versions (< 24) where the module | |
527 | * listing was not terminated, so we must ignore an EOF error in that case and | |
528 | * exit. In this situation, kluge_around_eof will be > 0. */ | |
1f75bb10 | 529 | static void whine_about_eof(int fd) |
7a55d06e | 530 | { |
574c2500 | 531 | if (kluge_around_eof && fd == sock_f_in) { |
55bb7fff | 532 | int i; |
574c2500 WD |
533 | if (kluge_around_eof > 0) |
534 | exit_cleanup(0); | |
55bb7fff WD |
535 | /* If we're still here after 10 seconds, exit with an error. */ |
536 | for (i = 10*1000/20; i--; ) | |
574c2500 WD |
537 | msleep(20); |
538 | } | |
3151cbae | 539 | |
00bdf899 | 540 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
dca68b0a WD |
541 | "(%.0f bytes received so far) [%s]\n", |
542 | (double)stats.total_read, who_am_i()); | |
00bdf899 WD |
543 | |
544 | exit_cleanup(RERR_STREAMIO); | |
7a55d06e | 545 | } |
720b47f2 | 546 | |
880da007 | 547 | /** |
6ed6d7f5 | 548 | * Read from a socket with I/O timeout. return the number of bytes |
c3563c46 MP |
549 | * read. If no bytes can be read then exit, never return a number <= 0. |
550 | * | |
8886f8d0 MP |
551 | * TODO: If the remote shell connection fails, then current versions |
552 | * actually report an "unexpected EOF" error here. Since it's a | |
553 | * fairly common mistake to try to use rsh when ssh is required, we | |
554 | * should trap that: if we fail to read any data at all, we should | |
555 | * give a better explanation. We can tell whether the connection has | |
556 | * started by looking e.g. at whether the remote version is known yet. | |
c3563c46 | 557 | */ |
3151cbae | 558 | static int read_timeout(int fd, char *buf, size_t len) |
8d9dc9f9 | 559 | { |
d8aeda1e | 560 | int n, cnt = 0; |
4c36ddbe | 561 | |
dde5b772 | 562 | io_flush(FULL_FLUSH); |
ea2111d1 | 563 | |
d8aeda1e | 564 | while (cnt == 0) { |
7a55d06e | 565 | /* until we manage to read *something* */ |
56014c8c | 566 | fd_set r_fds, w_fds; |
4c36ddbe | 567 | struct timeval tv; |
1ea087a7 | 568 | int maxfd = fd; |
a57873b7 | 569 | int count; |
4c36ddbe | 570 | |
56014c8c | 571 | FD_ZERO(&r_fds); |
a7026ba9 | 572 | FD_ZERO(&w_fds); |
56014c8c | 573 | FD_SET(fd, &r_fds); |
3309507d | 574 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
575 | int new_fd; |
576 | if (io_filesfrom_buflen == 0) { | |
3309507d | 577 | if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
578 | FD_SET(io_filesfrom_f_in, &r_fds); |
579 | new_fd = io_filesfrom_f_in; | |
580 | } else { | |
581 | io_filesfrom_f_out = -1; | |
582 | new_fd = -1; | |
583 | } | |
584 | } else { | |
56014c8c WD |
585 | FD_SET(io_filesfrom_f_out, &w_fds); |
586 | new_fd = io_filesfrom_f_out; | |
587 | } | |
1ea087a7 WD |
588 | if (new_fd > maxfd) |
589 | maxfd = new_fd; | |
554e0a8d AT |
590 | } |
591 | ||
e626b29e | 592 | tv.tv_sec = select_timeout; |
4c36ddbe AT |
593 | tv.tv_usec = 0; |
594 | ||
554e0a8d AT |
595 | errno = 0; |
596 | ||
a7026ba9 | 597 | count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); |
a57873b7 | 598 | |
a57873b7 | 599 | if (count <= 0) { |
f89b9368 | 600 | if (errno == EBADF) |
554e0a8d | 601 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 602 | check_timeout(); |
4c36ddbe AT |
603 | continue; |
604 | } | |
605 | ||
3309507d | 606 | if (io_filesfrom_f_out >= 0) { |
56014c8c WD |
607 | if (io_filesfrom_buflen) { |
608 | if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { | |
609 | int l = write(io_filesfrom_f_out, | |
610 | io_filesfrom_bp, | |
611 | io_filesfrom_buflen); | |
612 | if (l > 0) { | |
613 | if (!(io_filesfrom_buflen -= l)) | |
614 | io_filesfrom_bp = io_filesfrom_buf; | |
615 | else | |
616 | io_filesfrom_bp += l; | |
617 | } else { | |
618 | /* XXX should we complain? */ | |
619 | io_filesfrom_f_out = -1; | |
620 | } | |
621 | } | |
3309507d | 622 | } else if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
623 | if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { |
624 | int l = read(io_filesfrom_f_in, | |
625 | io_filesfrom_buf, | |
626 | sizeof io_filesfrom_buf); | |
627 | if (l <= 0) { | |
628 | /* Send end-of-file marker */ | |
629 | io_filesfrom_buf[0] = '\0'; | |
630 | io_filesfrom_buf[1] = '\0'; | |
631 | io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1; | |
632 | io_filesfrom_f_in = -1; | |
633 | } else { | |
56014c8c WD |
634 | if (!eol_nulls) { |
635 | char *s = io_filesfrom_buf + l; | |
636 | /* Transform CR and/or LF into '\0' */ | |
637 | while (s-- > io_filesfrom_buf) { | |
638 | if (*s == '\n' || *s == '\r') | |
639 | *s = '\0'; | |
640 | } | |
641 | } | |
642 | if (!io_filesfrom_lastchar) { | |
643 | /* Last buf ended with a '\0', so don't | |
644 | * let this buf start with one. */ | |
645 | while (l && !*io_filesfrom_bp) | |
646 | io_filesfrom_bp++, l--; | |
647 | } | |
648 | if (!l) | |
649 | io_filesfrom_bp = io_filesfrom_buf; | |
650 | else { | |
651 | char *f = io_filesfrom_bp; | |
652 | char *t = f; | |
653 | char *eob = f + l; | |
654 | /* Eliminate any multi-'\0' runs. */ | |
655 | while (f != eob) { | |
656 | if (!(*t++ = *f++)) { | |
657 | while (f != eob && !*f) | |
658 | f++, l--; | |
659 | } | |
660 | } | |
661 | io_filesfrom_lastchar = f[-1]; | |
662 | } | |
663 | io_filesfrom_buflen = l; | |
664 | } | |
665 | } | |
666 | } | |
667 | } | |
668 | ||
f89b9368 WD |
669 | if (!FD_ISSET(fd, &r_fds)) |
670 | continue; | |
554e0a8d | 671 | |
4c36ddbe AT |
672 | n = read(fd, buf, len); |
673 | ||
1ea087a7 WD |
674 | if (n <= 0) { |
675 | if (n == 0) | |
1f75bb10 | 676 | whine_about_eof(fd); /* Doesn't return. */ |
d62bcc17 WD |
677 | if (errno == EINTR || errno == EWOULDBLOCK |
678 | || errno == EAGAIN) | |
7a55d06e | 679 | continue; |
1f75bb10 WD |
680 | |
681 | /* Don't write errors on a dead socket. */ | |
72f2d1b3 | 682 | if (fd == sock_f_in) { |
8ef246e0 | 683 | io_end_multiplex_out(); |
72f2d1b3 WD |
684 | rsyserr(FSOCKERR, errno, "read error"); |
685 | } else | |
686 | rsyserr(FERROR, errno, "read error"); | |
1f75bb10 | 687 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 688 | } |
00bdf899 WD |
689 | |
690 | buf += n; | |
691 | len -= n; | |
d8aeda1e | 692 | cnt += n; |
1f75bb10 | 693 | |
3b0a30eb WD |
694 | if (fd == sock_f_in && io_timeout) |
695 | last_io_in = time(NULL); | |
4c36ddbe | 696 | } |
8d9dc9f9 | 697 | |
d8aeda1e | 698 | return cnt; |
4c36ddbe | 699 | } |
8d9dc9f9 | 700 | |
56014c8c WD |
701 | /** |
702 | * Read a line into the "fname" buffer (which must be at least MAXPATHLEN | |
703 | * characters long). | |
704 | */ | |
705 | int read_filesfrom_line(int fd, char *fname) | |
706 | { | |
707 | char ch, *s, *eob = fname + MAXPATHLEN - 1; | |
708 | int cnt; | |
d19320fd | 709 | int reading_remotely = filesfrom_host != NULL; |
56014c8c WD |
710 | int nulls = eol_nulls || reading_remotely; |
711 | ||
712 | start: | |
713 | s = fname; | |
714 | while (1) { | |
715 | cnt = read(fd, &ch, 1); | |
716 | if (cnt < 0 && (errno == EWOULDBLOCK | |
717 | || errno == EINTR || errno == EAGAIN)) { | |
718 | struct timeval tv; | |
6c850772 WD |
719 | fd_set r_fds, e_fds; |
720 | FD_ZERO(&r_fds); | |
721 | FD_SET(fd, &r_fds); | |
722 | FD_ZERO(&e_fds); | |
723 | FD_SET(fd, &e_fds); | |
e626b29e | 724 | tv.tv_sec = select_timeout; |
56014c8c | 725 | tv.tv_usec = 0; |
6c850772 | 726 | if (!select(fd+1, &r_fds, NULL, &e_fds, &tv)) |
56014c8c | 727 | check_timeout(); |
6c850772 WD |
728 | if (FD_ISSET(fd, &e_fds)) { |
729 | rsyserr(FINFO, errno, | |
730 | "select exception on fd %d", fd); | |
731 | } | |
56014c8c WD |
732 | continue; |
733 | } | |
734 | if (cnt != 1) | |
735 | break; | |
736 | if (nulls? !ch : (ch == '\r' || ch == '\n')) { | |
737 | /* Skip empty lines if reading locally. */ | |
738 | if (!reading_remotely && s == fname) | |
739 | continue; | |
740 | break; | |
741 | } | |
742 | if (s < eob) | |
743 | *s++ = ch; | |
744 | } | |
745 | *s = '\0'; | |
7a55d06e | 746 | |
6b45fcf1 WD |
747 | /* Dump comments. */ |
748 | if (*fname == '#' || *fname == ';') | |
56014c8c WD |
749 | goto start; |
750 | ||
751 | return s - fname; | |
752 | } | |
7a55d06e | 753 | |
8ef246e0 | 754 | int io_start_buffering_out(int f_out) |
1f75bb10 | 755 | { |
8ef246e0 WD |
756 | if (iobuf_out) { |
757 | assert(f_out == iobuf_f_out); | |
758 | return 0; | |
759 | } | |
1f75bb10 WD |
760 | if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) |
761 | out_of_memory("io_start_buffering_out"); | |
762 | iobuf_out_cnt = 0; | |
8ef246e0 WD |
763 | iobuf_f_out = f_out; |
764 | return 1; | |
1f75bb10 WD |
765 | } |
766 | ||
8ef246e0 | 767 | int io_start_buffering_in(int f_in) |
1f75bb10 | 768 | { |
8ef246e0 WD |
769 | if (iobuf_in) { |
770 | assert(f_in == iobuf_f_in); | |
771 | return 0; | |
772 | } | |
1f75bb10 WD |
773 | iobuf_in_siz = 2 * IO_BUFFER_SIZE; |
774 | if (!(iobuf_in = new_array(char, iobuf_in_siz))) | |
775 | out_of_memory("io_start_buffering_in"); | |
8ef246e0 WD |
776 | iobuf_f_in = f_in; |
777 | return 1; | |
1f75bb10 WD |
778 | } |
779 | ||
8ef246e0 | 780 | void io_end_buffering_in(void) |
1f75bb10 | 781 | { |
8ef246e0 WD |
782 | if (!iobuf_in) |
783 | return; | |
784 | free(iobuf_in); | |
785 | iobuf_in = NULL; | |
786 | iobuf_in_ndx = 0; | |
787 | iobuf_in_remaining = 0; | |
788 | iobuf_f_in = -1; | |
789 | } | |
790 | ||
791 | void io_end_buffering_out(void) | |
792 | { | |
793 | if (!iobuf_out) | |
794 | return; | |
795 | io_flush(FULL_FLUSH); | |
796 | free(iobuf_out); | |
797 | iobuf_out = NULL; | |
798 | iobuf_f_out = -1; | |
1f75bb10 WD |
799 | } |
800 | ||
626bec8e WD |
801 | void maybe_flush_socket(void) |
802 | { | |
3b0a30eb | 803 | if (iobuf_out && iobuf_out_cnt && time(NULL) - last_io_out >= 5) |
626bec8e WD |
804 | io_flush(NORMAL_FLUSH); |
805 | } | |
806 | ||
cdf236aa | 807 | void maybe_send_keepalive(void) |
9e2409ab | 808 | { |
3b0a30eb | 809 | if (time(NULL) - last_io_out >= allowed_lull) { |
9e2409ab | 810 | if (!iobuf_out || !iobuf_out_cnt) { |
3221f451 WD |
811 | if (protocol_version < 29) |
812 | return; /* there's nothing we can do */ | |
8ef246e0 WD |
813 | if (protocol_version >= 30) |
814 | send_msg(MSG_NOOP, "", 0); | |
815 | else { | |
816 | write_int(sock_f_out, cur_flist->count); | |
817 | write_shortint(sock_f_out, ITEM_IS_NEW); | |
818 | } | |
9e2409ab WD |
819 | } |
820 | if (iobuf_out) | |
821 | io_flush(NORMAL_FLUSH); | |
822 | } | |
823 | } | |
824 | ||
8ef246e0 WD |
825 | void start_flist_forward(int f_in) |
826 | { | |
827 | assert(iobuf_out != NULL); | |
828 | assert(iobuf_f_out == msg_fd_out); | |
829 | flist_forward_from = f_in; | |
830 | } | |
831 | ||
832 | void stop_flist_forward() | |
833 | { | |
8ef246e0 | 834 | flist_forward_from = -1; |
dde5b772 | 835 | io_flush(FULL_FLUSH); |
8ef246e0 WD |
836 | } |
837 | ||
880da007 MP |
838 | /** |
839 | * Continue trying to read len bytes - don't return until len has been | |
840 | * read. | |
841 | **/ | |
3151cbae | 842 | static void read_loop(int fd, char *buf, size_t len) |
4c36ddbe AT |
843 | { |
844 | while (len) { | |
845 | int n = read_timeout(fd, buf, len); | |
846 | ||
847 | buf += n; | |
848 | len -= n; | |
8d9dc9f9 AT |
849 | } |
850 | } | |
851 | ||
7a55d06e MP |
852 | /** |
853 | * Read from the file descriptor handling multiplexing - return number | |
854 | * of bytes read. | |
d62bcc17 WD |
855 | * |
856 | * Never returns <= 0. | |
7a55d06e | 857 | */ |
c399d22a | 858 | static int readfd_unbuffered(int fd, char *buf, size_t len) |
8d9dc9f9 | 859 | { |
f2a4853c | 860 | size_t msg_bytes; |
d8aeda1e | 861 | int tag, cnt = 0; |
33544bf4 | 862 | char line[BIGPATHBUFLEN]; |
8d9dc9f9 | 863 | |
8ef246e0 | 864 | if (!iobuf_in || fd != iobuf_f_in) |
4c36ddbe | 865 | return read_timeout(fd, buf, len); |
8d9dc9f9 | 866 | |
8ef246e0 WD |
867 | if (!io_multiplexing_in && iobuf_in_remaining == 0) { |
868 | iobuf_in_remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); | |
1f75bb10 | 869 | iobuf_in_ndx = 0; |
76c21947 WD |
870 | } |
871 | ||
d8aeda1e | 872 | while (cnt == 0) { |
8ef246e0 WD |
873 | if (iobuf_in_remaining) { |
874 | len = MIN(len, iobuf_in_remaining); | |
1f75bb10 WD |
875 | memcpy(buf, iobuf_in + iobuf_in_ndx, len); |
876 | iobuf_in_ndx += len; | |
8ef246e0 | 877 | iobuf_in_remaining -= len; |
d8aeda1e | 878 | cnt = len; |
76c21947 | 879 | break; |
8d9dc9f9 AT |
880 | } |
881 | ||
909ce14f | 882 | read_loop(fd, line, 4); |
ff41a59f | 883 | tag = IVAL(line, 0); |
679e7657 | 884 | |
f2a4853c | 885 | msg_bytes = tag & 0xFFFFFF; |
d17e1dd2 | 886 | tag = (tag >> 24) - MPLEX_BASE; |
8d9dc9f9 | 887 | |
d17e1dd2 WD |
888 | switch (tag) { |
889 | case MSG_DATA: | |
f2a4853c | 890 | if (msg_bytes > iobuf_in_siz) { |
1f75bb10 | 891 | if (!(iobuf_in = realloc_array(iobuf_in, char, |
f2a4853c | 892 | msg_bytes))) |
c399d22a | 893 | out_of_memory("readfd_unbuffered"); |
f2a4853c | 894 | iobuf_in_siz = msg_bytes; |
76c21947 | 895 | } |
f2a4853c | 896 | read_loop(fd, iobuf_in, msg_bytes); |
8ef246e0 | 897 | iobuf_in_remaining = msg_bytes; |
1f75bb10 | 898 | iobuf_in_ndx = 0; |
d17e1dd2 | 899 | break; |
8ef246e0 WD |
900 | case MSG_NOOP: |
901 | if (am_sender) | |
902 | maybe_send_keepalive(); | |
903 | break; | |
904 | case MSG_IO_ERROR: | |
905 | if (msg_bytes != 4) | |
906 | goto invalid_msg; | |
907 | read_loop(fd, line, msg_bytes); | |
908 | io_error |= IVAL(line, 0); | |
909 | break; | |
0d67e00a | 910 | case MSG_DELETED: |
f2a4853c WD |
911 | if (msg_bytes >= sizeof line) |
912 | goto overflow; | |
913 | read_loop(fd, line, msg_bytes); | |
0d67e00a | 914 | /* A directory name was sent with the trailing null */ |
f2a4853c | 915 | if (msg_bytes > 0 && !line[msg_bytes-1]) |
0d67e00a | 916 | log_delete(line, S_IFDIR); |
12bda6f7 WD |
917 | else { |
918 | line[msg_bytes] = '\0'; | |
0d67e00a | 919 | log_delete(line, S_IFREG); |
12bda6f7 | 920 | } |
0d67e00a | 921 | break; |
9981c27e | 922 | case MSG_SUCCESS: |
f2a4853c | 923 | if (msg_bytes != 4) { |
8ef246e0 | 924 | invalid_msg: |
cdf236aa | 925 | rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n", |
f2a4853c | 926 | tag, (long)msg_bytes, who_am_i()); |
9981c27e WD |
927 | exit_cleanup(RERR_STREAMIO); |
928 | } | |
f2a4853c | 929 | read_loop(fd, line, msg_bytes); |
9981c27e | 930 | successful_send(IVAL(line, 0)); |
9981c27e | 931 | break; |
8ef246e0 WD |
932 | case MSG_NO_SEND: |
933 | if (msg_bytes != 4) | |
934 | goto invalid_msg; | |
935 | read_loop(fd, line, msg_bytes); | |
936 | send_msg_int(MSG_NO_SEND, IVAL(line, 0)); | |
937 | break; | |
d17e1dd2 WD |
938 | case MSG_INFO: |
939 | case MSG_ERROR: | |
f2a4853c WD |
940 | if (msg_bytes >= sizeof line) { |
941 | overflow: | |
bd9fca47 | 942 | rprintf(FERROR, |
cdf236aa | 943 | "multiplexing overflow %d:%ld [%s]\n", |
f2a4853c | 944 | tag, (long)msg_bytes, who_am_i()); |
d17e1dd2 WD |
945 | exit_cleanup(RERR_STREAMIO); |
946 | } | |
f2a4853c WD |
947 | read_loop(fd, line, msg_bytes); |
948 | rwrite((enum logcode)tag, line, msg_bytes); | |
d17e1dd2 WD |
949 | break; |
950 | default: | |
cdf236aa WD |
951 | rprintf(FERROR, "unexpected tag %d [%s]\n", |
952 | tag, who_am_i()); | |
65417579 | 953 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 954 | } |
8d9dc9f9 AT |
955 | } |
956 | ||
8ef246e0 | 957 | if (iobuf_in_remaining == 0) |
d17e1dd2 | 958 | io_flush(NORMAL_FLUSH); |
76c21947 | 959 | |
d8aeda1e | 960 | return cnt; |
8d9dc9f9 AT |
961 | } |
962 | ||
dde5b772 WD |
963 | /* Do a buffered read from fd. Don't return until all N bytes have |
964 | * been read. If all N can't be read then exit with an error. */ | |
3151cbae | 965 | static void readfd(int fd, char *buffer, size_t N) |
720b47f2 | 966 | { |
d8aeda1e | 967 | int cnt; |
d62bcc17 | 968 | size_t total = 0; |
3151cbae | 969 | |
6ba9279f | 970 | while (total < N) { |
d8aeda1e WD |
971 | cnt = readfd_unbuffered(fd, buffer + total, N-total); |
972 | total += cnt; | |
7f28dbee | 973 | } |
1b7c47cb | 974 | |
b9f592fb WD |
975 | if (fd == write_batch_monitor_in) { |
976 | if ((size_t)write(batch_fd, buffer, total) != total) | |
977 | exit_cleanup(RERR_FILEIO); | |
978 | } | |
1f75bb10 | 979 | |
8ef246e0 WD |
980 | if (fd == flist_forward_from) |
981 | writefd(iobuf_f_out, buffer, total); | |
982 | ||
1f75bb10 WD |
983 | if (fd == sock_f_in) |
984 | stats.total_read += total; | |
720b47f2 AT |
985 | } |
986 | ||
3a993aa4 | 987 | unsigned short read_shortint(int f) |
9361f839 | 988 | { |
482f48cc WD |
989 | char b[2]; |
990 | readfd(f, b, 2); | |
991 | return (UVAL(b, 1) << 8) + UVAL(b, 0); | |
9361f839 WD |
992 | } |
993 | ||
b7922338 | 994 | int32 read_int(int f) |
720b47f2 | 995 | { |
4c36ddbe | 996 | char b[4]; |
d8aeda1e | 997 | int32 num; |
d730b113 | 998 | |
482f48cc WD |
999 | readfd(f, b, 4); |
1000 | num = IVAL(b, 0); | |
1001 | #if SIZEOF_INT32 > 4 | |
1002 | if (num & (int32)0x80000000) | |
1003 | num |= ~(int32)0xffffffff; | |
1004 | #endif | |
d8aeda1e | 1005 | return num; |
720b47f2 AT |
1006 | } |
1007 | ||
71c46176 | 1008 | int64 read_longint(int f) |
3a6a366f | 1009 | { |
d8aeda1e | 1010 | int64 num; |
482f48cc WD |
1011 | char b[9]; |
1012 | ||
1013 | if (protocol_version < 30) { | |
1014 | num = read_int(f); | |
71c46176 | 1015 | |
482f48cc WD |
1016 | if ((int32)num != (int32)0xffffffff) |
1017 | return num; | |
71c46176 | 1018 | |
031fa9ad | 1019 | #if SIZEOF_INT64 < 8 |
482f48cc WD |
1020 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
1021 | exit_cleanup(RERR_UNSUPPORTED); | |
031fa9ad | 1022 | #else |
482f48cc WD |
1023 | readfd(f, b, 8); |
1024 | num = IVAL(b,0) | (((int64)IVAL(b,4))<<32); | |
031fa9ad | 1025 | #endif |
482f48cc WD |
1026 | } else { |
1027 | int cnt; | |
1028 | readfd(f, b, 3); | |
c09af06d | 1029 | cnt = int_byte_cnt[CVAL(b, 0) / 4]; |
4ea4acf1 WD |
1030 | #if SIZEOF_INT64 < 8 |
1031 | if (cnt > 5 || (cnt == 5 && (CVAL(b,0)&0x3F || CVAL(b,1)&0x80))) { | |
1032 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1033 | exit_cleanup(RERR_UNSUPPORTED); | |
1034 | } | |
1035 | #endif | |
482f48cc WD |
1036 | if (cnt > 3) |
1037 | readfd(f, b + 3, cnt - 3); | |
1038 | switch (cnt) { | |
1039 | case 3: | |
1040 | num = NVAL3(b, 0); | |
1041 | break; | |
1042 | case 4: | |
1043 | num = NVAL4(b, 0x80); | |
1044 | break; | |
1045 | case 5: | |
1046 | num = NVAL5(b, 0xC0); | |
1047 | break; | |
4ea4acf1 | 1048 | #if SIZEOF_INT64 >= 8 |
482f48cc WD |
1049 | case 6: |
1050 | num = NVAL6(b, 0xE0); | |
1051 | break; | |
1052 | case 7: | |
1053 | num = NVAL7(b, 0xF0); | |
1054 | break; | |
1055 | case 8: | |
1056 | num = NVAL8(b, 0xF8); | |
1057 | break; | |
1058 | case 9: | |
1059 | num = NVAL8(b+1, 0); | |
1060 | break; | |
4ea4acf1 | 1061 | #endif |
482f48cc | 1062 | default: |
4ea4acf1 | 1063 | exit_cleanup(RERR_PROTOCOL); /* impossible... */ |
482f48cc WD |
1064 | } |
1065 | } | |
71c46176 | 1066 | |
d8aeda1e | 1067 | return num; |
3a6a366f AT |
1068 | } |
1069 | ||
4a19c3b2 | 1070 | void read_buf(int f, char *buf, size_t len) |
720b47f2 | 1071 | { |
4c36ddbe | 1072 | readfd(f,buf,len); |
720b47f2 AT |
1073 | } |
1074 | ||
4a19c3b2 | 1075 | void read_sbuf(int f, char *buf, size_t len) |
575f2fca | 1076 | { |
93095cbe | 1077 | readfd(f, buf, len); |
af436313 | 1078 | buf[len] = '\0'; |
575f2fca AT |
1079 | } |
1080 | ||
9361f839 | 1081 | uchar read_byte(int f) |
182dca5c | 1082 | { |
9361f839 | 1083 | uchar c; |
93095cbe | 1084 | readfd(f, (char *)&c, 1); |
4c36ddbe | 1085 | return c; |
182dca5c | 1086 | } |
720b47f2 | 1087 | |
46e99b09 WD |
1088 | int read_vstring(int f, char *buf, int bufsize) |
1089 | { | |
1090 | int len = read_byte(f); | |
1091 | ||
1092 | if (len & 0x80) | |
1093 | len = (len & ~0x80) * 0x100 + read_byte(f); | |
1094 | ||
1095 | if (len >= bufsize) { | |
1096 | rprintf(FERROR, "over-long vstring received (%d > %d)\n", | |
1097 | len, bufsize - 1); | |
9a6ed83f | 1098 | return -1; |
46e99b09 WD |
1099 | } |
1100 | ||
1101 | if (len) | |
1102 | readfd(f, buf, len); | |
1103 | buf[len] = '\0'; | |
1104 | return len; | |
1105 | } | |
1106 | ||
188fed95 WD |
1107 | /* Populate a sum_struct with values from the socket. This is |
1108 | * called by both the sender and the receiver. */ | |
1109 | void read_sum_head(int f, struct sum_struct *sum) | |
1110 | { | |
1111 | sum->count = read_int(f); | |
c638caa6 WD |
1112 | if (sum->count < 0) { |
1113 | rprintf(FERROR, "Invalid checksum count %ld [%s]\n", | |
1114 | (long)sum->count, who_am_i()); | |
1115 | exit_cleanup(RERR_PROTOCOL); | |
1116 | } | |
188fed95 WD |
1117 | sum->blength = read_int(f); |
1118 | if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { | |
cdf236aa WD |
1119 | rprintf(FERROR, "Invalid block length %ld [%s]\n", |
1120 | (long)sum->blength, who_am_i()); | |
188fed95 WD |
1121 | exit_cleanup(RERR_PROTOCOL); |
1122 | } | |
1123 | sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); | |
1124 | if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) { | |
cdf236aa WD |
1125 | rprintf(FERROR, "Invalid checksum length %d [%s]\n", |
1126 | sum->s2length, who_am_i()); | |
188fed95 WD |
1127 | exit_cleanup(RERR_PROTOCOL); |
1128 | } | |
1129 | sum->remainder = read_int(f); | |
1130 | if (sum->remainder < 0 || sum->remainder > sum->blength) { | |
cdf236aa WD |
1131 | rprintf(FERROR, "Invalid remainder length %ld [%s]\n", |
1132 | (long)sum->remainder, who_am_i()); | |
188fed95 WD |
1133 | exit_cleanup(RERR_PROTOCOL); |
1134 | } | |
1135 | } | |
1136 | ||
c207d7ec WD |
1137 | /* Send the values from a sum_struct over the socket. Set sum to |
1138 | * NULL if there are no checksums to send. This is called by both | |
1139 | * the generator and the sender. */ | |
1140 | void write_sum_head(int f, struct sum_struct *sum) | |
1141 | { | |
1142 | static struct sum_struct null_sum; | |
1143 | ||
1144 | if (sum == NULL) | |
1145 | sum = &null_sum; | |
1146 | ||
1147 | write_int(f, sum->count); | |
1148 | write_int(f, sum->blength); | |
1149 | if (protocol_version >= 27) | |
1150 | write_int(f, sum->s2length); | |
1151 | write_int(f, sum->remainder); | |
1152 | } | |
1153 | ||
08571358 MP |
1154 | /** |
1155 | * Sleep after writing to limit I/O bandwidth usage. | |
1156 | * | |
1157 | * @todo Rather than sleeping after each write, it might be better to | |
1158 | * use some kind of averaging. The current algorithm seems to always | |
1159 | * use a bit less bandwidth than specified, because it doesn't make up | |
1160 | * for slow periods. But arguably this is a feature. In addition, we | |
1161 | * ought to take the time used to write the data into account. | |
71e58630 WD |
1162 | * |
1163 | * During some phases of big transfers (file FOO is uptodate) this is | |
1164 | * called with a small bytes_written every time. As the kernel has to | |
1165 | * round small waits up to guarantee that we actually wait at least the | |
1166 | * requested number of microseconds, this can become grossly inaccurate. | |
1167 | * We therefore keep track of the bytes we've written over time and only | |
1168 | * sleep when the accumulated delay is at least 1 tenth of a second. | |
08571358 MP |
1169 | **/ |
1170 | static void sleep_for_bwlimit(int bytes_written) | |
1171 | { | |
71e58630 | 1172 | static struct timeval prior_tv; |
0f78b815 | 1173 | static long total_written = 0; |
71e58630 WD |
1174 | struct timeval tv, start_tv; |
1175 | long elapsed_usec, sleep_usec; | |
1176 | ||
1177 | #define ONE_SEC 1000000L /* # of microseconds in a second */ | |
08571358 | 1178 | |
9a0cfff5 | 1179 | if (!bwlimit_writemax) |
08571358 | 1180 | return; |
e681e820 | 1181 | |
0f78b815 | 1182 | total_written += bytes_written; |
71e58630 WD |
1183 | |
1184 | gettimeofday(&start_tv, NULL); | |
1185 | if (prior_tv.tv_sec) { | |
1186 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC | |
1187 | + (start_tv.tv_usec - prior_tv.tv_usec); | |
1188 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); | |
1189 | if (total_written < 0) | |
1190 | total_written = 0; | |
1191 | } | |
3151cbae | 1192 | |
71e58630 WD |
1193 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
1194 | if (sleep_usec < ONE_SEC / 10) { | |
1195 | prior_tv = start_tv; | |
1196 | return; | |
1197 | } | |
08571358 | 1198 | |
71e58630 WD |
1199 | tv.tv_sec = sleep_usec / ONE_SEC; |
1200 | tv.tv_usec = sleep_usec % ONE_SEC; | |
98b332ed | 1201 | select(0, NULL, NULL, NULL, &tv); |
71e58630 WD |
1202 | |
1203 | gettimeofday(&prior_tv, NULL); | |
1204 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC | |
1205 | + (prior_tv.tv_usec - start_tv.tv_usec); | |
1206 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); | |
08571358 MP |
1207 | } |
1208 | ||
1f75bb10 | 1209 | /* Write len bytes to the file descriptor fd, looping as necessary to get |
0fb2fc4a | 1210 | * the job done and also (in certain circumstances) reading any data on |
af436313 | 1211 | * msg_fd_in to avoid deadlock. |
880da007 MP |
1212 | * |
1213 | * This function underlies the multiplexing system. The body of the | |
1f75bb10 | 1214 | * application never calls this function directly. */ |
4a19c3b2 | 1215 | static void writefd_unbuffered(int fd, const char *buf, size_t len) |
720b47f2 | 1216 | { |
1ea087a7 | 1217 | size_t n, total = 0; |
6c850772 | 1218 | fd_set w_fds, r_fds, e_fds; |
d8aeda1e | 1219 | int maxfd, count, cnt, using_r_fds; |
7d51b837 | 1220 | int defer_save = defer_forwarding_messages; |
8d9dc9f9 | 1221 | struct timeval tv; |
720b47f2 | 1222 | |
3be97bf9 WD |
1223 | if (no_flush++) |
1224 | defer_forwarding_messages = 1; | |
e44f9a12 | 1225 | |
4c36ddbe | 1226 | while (total < len) { |
8d9dc9f9 | 1227 | FD_ZERO(&w_fds); |
6c850772 WD |
1228 | FD_SET(fd, &w_fds); |
1229 | FD_ZERO(&e_fds); | |
1230 | FD_SET(fd, &e_fds); | |
1ea087a7 | 1231 | maxfd = fd; |
4c36ddbe | 1232 | |
954bbed8 | 1233 | if (msg_fd_in >= 0) { |
56014c8c | 1234 | FD_ZERO(&r_fds); |
6c850772 | 1235 | FD_SET(msg_fd_in, &r_fds); |
1ea087a7 WD |
1236 | if (msg_fd_in > maxfd) |
1237 | maxfd = msg_fd_in; | |
3eeac9bc WD |
1238 | using_r_fds = 1; |
1239 | } else | |
1240 | using_r_fds = 0; | |
8d9dc9f9 | 1241 | |
e626b29e | 1242 | tv.tv_sec = select_timeout; |
8d9dc9f9 | 1243 | tv.tv_usec = 0; |
4c36ddbe | 1244 | |
554e0a8d | 1245 | errno = 0; |
3eeac9bc | 1246 | count = select(maxfd + 1, using_r_fds ? &r_fds : NULL, |
6c850772 | 1247 | &w_fds, &e_fds, &tv); |
4c36ddbe AT |
1248 | |
1249 | if (count <= 0) { | |
1ea087a7 | 1250 | if (count < 0 && errno == EBADF) |
554e0a8d | 1251 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 1252 | check_timeout(); |
8d9dc9f9 AT |
1253 | continue; |
1254 | } | |
4c36ddbe | 1255 | |
6c850772 WD |
1256 | if (FD_ISSET(fd, &e_fds)) { |
1257 | rsyserr(FINFO, errno, | |
1258 | "select exception on fd %d", fd); | |
1259 | } | |
1260 | ||
3eeac9bc | 1261 | if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds)) |
d17e1dd2 | 1262 | read_msg_fd(); |
554e0a8d | 1263 | |
9a6ed83f | 1264 | if (!FD_ISSET(fd, &w_fds)) |
1ea087a7 | 1265 | continue; |
4c36ddbe | 1266 | |
1ea087a7 | 1267 | n = len - total; |
9a0cfff5 | 1268 | if (bwlimit_writemax && n > bwlimit_writemax) |
1ea087a7 | 1269 | n = bwlimit_writemax; |
d8aeda1e | 1270 | cnt = write(fd, buf + total, n); |
1ea087a7 | 1271 | |
d8aeda1e WD |
1272 | if (cnt <= 0) { |
1273 | if (cnt < 0) { | |
3309507d WD |
1274 | if (errno == EINTR) |
1275 | continue; | |
1276 | if (errno == EWOULDBLOCK || errno == EAGAIN) { | |
1277 | msleep(1); | |
1278 | continue; | |
1279 | } | |
f0359dd0 AT |
1280 | } |
1281 | ||
1ea087a7 | 1282 | /* Don't try to write errors back across the stream. */ |
1f75bb10 | 1283 | if (fd == sock_f_out) |
8ef246e0 | 1284 | io_end_multiplex_out(); |
1ea087a7 | 1285 | rsyserr(FERROR, errno, |
b88c2e8f WD |
1286 | "writefd_unbuffered failed to write %ld bytes [%s]", |
1287 | (long)len, who_am_i()); | |
d1b31da7 WD |
1288 | /* If the other side is sending us error messages, try |
1289 | * to grab any messages they sent before they died. */ | |
7f459268 | 1290 | while (fd == sock_f_out && io_multiplexing_in) { |
3b0a30eb | 1291 | set_io_timeout(30); |
9e2409ab | 1292 | ignore_timeout = 0; |
d1b31da7 WD |
1293 | readfd_unbuffered(sock_f_in, io_filesfrom_buf, |
1294 | sizeof io_filesfrom_buf); | |
1295 | } | |
1ea087a7 WD |
1296 | exit_cleanup(RERR_STREAMIO); |
1297 | } | |
4c36ddbe | 1298 | |
d8aeda1e | 1299 | total += cnt; |
954bbed8 | 1300 | defer_forwarding_messages = 1; |
a800434a | 1301 | |
1f75bb10 | 1302 | if (fd == sock_f_out) { |
626bec8e | 1303 | if (io_timeout || am_generator) |
3b0a30eb | 1304 | last_io_out = time(NULL); |
d8aeda1e | 1305 | sleep_for_bwlimit(cnt); |
1f75bb10 | 1306 | } |
4c36ddbe | 1307 | } |
e44f9a12 AT |
1308 | |
1309 | no_flush--; | |
3be97bf9 | 1310 | if (!(defer_forwarding_messages = defer_save)) |
7d51b837 | 1311 | msg2sndr_flush(); |
d6dead6b AT |
1312 | } |
1313 | ||
dde5b772 | 1314 | void io_flush(int flush_it_all) |
d6dead6b | 1315 | { |
3be97bf9 | 1316 | if (flush_it_all && !defer_forwarding_messages) |
dde5b772 | 1317 | msg2sndr_flush(); |
90ba34e2 | 1318 | |
1f75bb10 | 1319 | if (!iobuf_out_cnt || no_flush) |
d17e1dd2 | 1320 | return; |
8d9dc9f9 | 1321 | |
d17e1dd2 | 1322 | if (io_multiplexing_out) |
3be97bf9 | 1323 | mplex_write(sock_f_out, MSG_DATA, iobuf_out, iobuf_out_cnt); |
d17e1dd2 | 1324 | else |
8ef246e0 | 1325 | writefd_unbuffered(iobuf_f_out, iobuf_out, iobuf_out_cnt); |
1f75bb10 | 1326 | iobuf_out_cnt = 0; |
8d9dc9f9 AT |
1327 | } |
1328 | ||
4a19c3b2 | 1329 | static void writefd(int fd, const char *buf, size_t len) |
d6dead6b | 1330 | { |
1f75bb10 WD |
1331 | if (fd == sock_f_out) |
1332 | stats.total_written += len; | |
1333 | ||
b9f592fb WD |
1334 | if (fd == write_batch_monitor_out) { |
1335 | if ((size_t)write(batch_fd, buf, len) != len) | |
1336 | exit_cleanup(RERR_FILEIO); | |
1337 | } | |
1338 | ||
8ef246e0 | 1339 | if (!iobuf_out || fd != iobuf_f_out) { |
4c36ddbe AT |
1340 | writefd_unbuffered(fd, buf, len); |
1341 | return; | |
1342 | } | |
d6dead6b AT |
1343 | |
1344 | while (len) { | |
1f75bb10 | 1345 | int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt); |
d6dead6b | 1346 | if (n > 0) { |
1f75bb10 | 1347 | memcpy(iobuf_out+iobuf_out_cnt, buf, n); |
d6dead6b AT |
1348 | buf += n; |
1349 | len -= n; | |
1f75bb10 | 1350 | iobuf_out_cnt += n; |
d6dead6b | 1351 | } |
3151cbae | 1352 | |
1f75bb10 | 1353 | if (iobuf_out_cnt == IO_BUFFER_SIZE) |
d17e1dd2 | 1354 | io_flush(NORMAL_FLUSH); |
d6dead6b | 1355 | } |
d6dead6b | 1356 | } |
720b47f2 | 1357 | |
3a993aa4 | 1358 | void write_shortint(int f, unsigned short x) |
9361f839 | 1359 | { |
3a993aa4 WD |
1360 | char b[2]; |
1361 | b[0] = (char)x; | |
1362 | b[1] = (char)(x >> 8); | |
1363 | writefd(f, b, 2); | |
9361f839 WD |
1364 | } |
1365 | ||
482f48cc | 1366 | void write_int(int f, int32 x) |
720b47f2 | 1367 | { |
8d9dc9f9 | 1368 | char b[4]; |
482f48cc WD |
1369 | SIVAL(b, 0, x); |
1370 | writefd(f, b, 4); | |
720b47f2 AT |
1371 | } |
1372 | ||
7a24c346 MP |
1373 | /* |
1374 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any | |
1375 | * 64-bit types on this platform. | |
1376 | */ | |
71c46176 | 1377 | void write_longint(int f, int64 x) |
3a6a366f | 1378 | { |
482f48cc | 1379 | char b[12]; |
3a6a366f | 1380 | |
482f48cc WD |
1381 | #if SIZEOF_INT64 < 8 |
1382 | if (x < 0 || x > 0x7FFFFFFF) { | |
1383 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1384 | exit_cleanup(RERR_UNSUPPORTED); | |
3a6a366f | 1385 | } |
482f48cc | 1386 | #endif |
3a6a366f | 1387 | |
482f48cc WD |
1388 | if (protocol_version < 30) { |
1389 | char * const s = b+4; | |
1390 | SIVAL(s, 0, x); | |
031fa9ad | 1391 | #if SIZEOF_INT64 < 8 |
482f48cc | 1392 | writefd(f, s, 4); |
031fa9ad | 1393 | #else |
482f48cc WD |
1394 | if (x <= 0x7FFFFFFF && x >= 0) { |
1395 | writefd(f, s, 4); | |
1396 | return; | |
1397 | } | |
3a6a366f | 1398 | |
482f48cc WD |
1399 | memset(b, 0xFF, 4); |
1400 | SIVAL(s, 4, x >> 32); | |
1401 | writefd(f, b, 12); | |
1402 | } else if (x < 0) { | |
1403 | goto all_bits; | |
031fa9ad | 1404 | #endif |
482f48cc | 1405 | } else if (x < ((int32)1<<(3*8-1))) { |
3a993aa4 WD |
1406 | b[0] = (char)(x >> 16); |
1407 | b[1] = (char)(x >> 8); | |
1408 | b[2] = (char)x; | |
482f48cc WD |
1409 | writefd(f, b, 3); |
1410 | } else if (x < ((int64)1<<(4*8-2))) { | |
3a993aa4 WD |
1411 | b[0] = (char)((x >> 24) | 0x80); |
1412 | b[1] = (char)(x >> 16); | |
1413 | b[2] = (char)(x >> 8); | |
1414 | b[3] = (char)x; | |
482f48cc | 1415 | writefd(f, b, 4); |
4ea4acf1 WD |
1416 | #if SIZEOF_INT64 < 8 |
1417 | } else { | |
1418 | b[0] = 0xC0; | |
1419 | b[1] = (char)(x >> 24); | |
1420 | b[2] = (char)(x >> 16); | |
1421 | b[3] = (char)(x >> 8); | |
1422 | b[4] = (char)x; | |
1423 | writefd(f, b, 5); | |
1424 | } | |
1425 | #else | |
482f48cc | 1426 | } else if (x < ((int64)1<<(5*8-3))) { |
3a993aa4 WD |
1427 | b[0] = (char)((x >> 32) | 0xC0); |
1428 | b[1] = (char)(x >> 24); | |
1429 | b[2] = (char)(x >> 16); | |
1430 | b[3] = (char)(x >> 8); | |
1431 | b[4] = (char)x; | |
482f48cc | 1432 | writefd(f, b, 5); |
482f48cc | 1433 | } else if (x < ((int64)1<<(6*8-4))) { |
3a993aa4 WD |
1434 | b[0] = (char)((x >> 40) | 0xE0); |
1435 | b[1] = (char)(x >> 32); | |
1436 | b[2] = (char)(x >> 24); | |
1437 | b[3] = (char)(x >> 16); | |
1438 | b[4] = (char)(x >> 8); | |
1439 | b[5] = (char)x; | |
482f48cc WD |
1440 | writefd(f, b, 6); |
1441 | } else if (x < ((int64)1<<(7*8-5))) { | |
3a993aa4 WD |
1442 | b[0] = (char)((x >> 48) | 0xF0); |
1443 | b[1] = (char)(x >> 40); | |
1444 | b[2] = (char)(x >> 32); | |
1445 | b[3] = (char)(x >> 24); | |
1446 | b[4] = (char)(x >> 16); | |
1447 | b[5] = (char)(x >> 8); | |
1448 | b[6] = (char)x; | |
482f48cc WD |
1449 | writefd(f, b, 7); |
1450 | } else if (x < ((int64)1<<(8*8-6))) { | |
3a993aa4 WD |
1451 | b[0] = (char)((x >> 56) | 0xF8); |
1452 | b[1] = (char)(x >> 48); | |
1453 | b[2] = (char)(x >> 40); | |
1454 | b[3] = (char)(x >> 32); | |
1455 | b[4] = (char)(x >> 24); | |
1456 | b[5] = (char)(x >> 16); | |
1457 | b[6] = (char)(x >> 8); | |
1458 | b[7] = (char)x; | |
482f48cc WD |
1459 | writefd(f, b, 8); |
1460 | } else { | |
1461 | all_bits: | |
3a993aa4 WD |
1462 | b[0] = (char)0xFC; |
1463 | b[1] = (char)(x >> 56); | |
1464 | b[2] = (char)(x >> 48); | |
1465 | b[3] = (char)(x >> 40); | |
1466 | b[4] = (char)(x >> 32); | |
1467 | b[5] = (char)(x >> 24); | |
1468 | b[6] = (char)(x >> 16); | |
1469 | b[7] = (char)(x >> 8); | |
1470 | b[8] = (char)x; | |
482f48cc | 1471 | writefd(f, b, 9); |
482f48cc | 1472 | } |
4ea4acf1 | 1473 | #endif |
3a6a366f AT |
1474 | } |
1475 | ||
4a19c3b2 | 1476 | void write_buf(int f, const char *buf, size_t len) |
720b47f2 | 1477 | { |
4c36ddbe | 1478 | writefd(f,buf,len); |
720b47f2 AT |
1479 | } |
1480 | ||
880da007 | 1481 | /** Write a string to the connection */ |
4a19c3b2 | 1482 | void write_sbuf(int f, const char *buf) |
f0fca04e | 1483 | { |
93095cbe | 1484 | writefd(f, buf, strlen(buf)); |
f0fca04e AT |
1485 | } |
1486 | ||
9361f839 | 1487 | void write_byte(int f, uchar c) |
182dca5c | 1488 | { |
93095cbe | 1489 | writefd(f, (char *)&c, 1); |
182dca5c AT |
1490 | } |
1491 | ||
4a19c3b2 | 1492 | void write_vstring(int f, const char *str, int len) |
46e99b09 WD |
1493 | { |
1494 | uchar lenbuf[3], *lb = lenbuf; | |
1495 | ||
1496 | if (len > 0x7F) { | |
1497 | if (len > 0x7FFF) { | |
1498 | rprintf(FERROR, | |
1499 | "attempting to send over-long vstring (%d > %d)\n", | |
1500 | len, 0x7FFF); | |
1501 | exit_cleanup(RERR_PROTOCOL); | |
1502 | } | |
1503 | *lb++ = len / 0x100 + 0x80; | |
1504 | } | |
1505 | *lb = len; | |
1506 | ||
1507 | writefd(f, (char*)lenbuf, lb - lenbuf + 1); | |
1508 | if (len) | |
1509 | writefd(f, str, len); | |
1510 | } | |
1511 | ||
8a65e0ce WD |
1512 | /* Send a file-list index using a byte-reduction method. */ |
1513 | void write_ndx(int f, int32 ndx) | |
1514 | { | |
1515 | static int32 prev_positive = -1, prev_negative = 1; | |
1516 | int32 diff, cnt = 0; | |
1517 | char b[6]; | |
1518 | ||
1519 | if (protocol_version < 30 || read_batch) { | |
1520 | write_int(f, ndx); | |
1521 | return; | |
1522 | } | |
1523 | ||
1524 | /* Send NDX_DONE as a single-byte 0 with no side effects. Send | |
1525 | * negative nums as a positive after sending a leading 0xFF. */ | |
1526 | if (ndx >= 0) { | |
1527 | diff = ndx - prev_positive; | |
1528 | prev_positive = ndx; | |
1529 | } else if (ndx == NDX_DONE) { | |
1530 | *b = 0; | |
1531 | writefd(f, b, 1); | |
1532 | return; | |
1533 | } else { | |
1534 | b[cnt++] = (char)0xFF; | |
1535 | ndx = -ndx; | |
1536 | diff = ndx - prev_negative; | |
1537 | prev_negative = ndx; | |
1538 | } | |
1539 | ||
1540 | /* A diff of 1 - 253 is sent as a one-byte diff; a diff of 254 - 32767 | |
1541 | * or 0 is sent as a 0xFE + a two-byte diff; otherwise we send 0xFE | |
1542 | * & all 4 bytes of the (non-negative) num with the high-bit set. */ | |
1543 | if (diff < 0xFE && diff > 0) | |
1544 | b[cnt++] = (char)diff; | |
1545 | else if (diff < 0 || diff > 0x7FFF) { | |
1546 | b[cnt++] = (char)0xFE; | |
1547 | b[cnt++] = (char)((ndx >> 24) | 0x80); | |
1548 | b[cnt++] = (char)(ndx >> 16); | |
1549 | b[cnt++] = (char)(ndx >> 8); | |
1550 | b[cnt++] = (char)ndx; | |
1551 | } else { | |
1552 | b[cnt++] = (char)0xFE; | |
1553 | b[cnt++] = (char)(diff >> 8); | |
1554 | b[cnt++] = (char)diff; | |
1555 | } | |
1556 | writefd(f, b, cnt); | |
1557 | } | |
1558 | ||
1559 | /* Receive a file-list index using a byte-reduction method. */ | |
1560 | int32 read_ndx(int f) | |
1561 | { | |
1562 | static int32 prev_positive = -1, prev_negative = 1; | |
1563 | int32 *prev_ptr, num; | |
1564 | char b[4]; | |
1565 | ||
1566 | if (protocol_version < 30) | |
1567 | return read_int(f); | |
1568 | ||
1569 | readfd(f, b, 1); | |
1570 | if (CVAL(b, 0) == 0xFF) { | |
1571 | readfd(f, b, 1); | |
1572 | prev_ptr = &prev_negative; | |
1573 | } else if (CVAL(b, 0) == 0) | |
1574 | return NDX_DONE; | |
1575 | else | |
1576 | prev_ptr = &prev_positive; | |
1577 | if (CVAL(b, 0) == 0xFE) { | |
1578 | readfd(f, b, 2); | |
1579 | if (CVAL(b, 0) & 0x80) { | |
1580 | readfd(f, b+2, 2); | |
1581 | num = NVAL4(b, 0x80); | |
1582 | } else | |
1583 | num = NVAL2(b, 0) + *prev_ptr; | |
1584 | } else | |
1585 | num = CVAL(b, 0) + *prev_ptr; | |
1586 | *prev_ptr = num; | |
1587 | if (prev_ptr == &prev_negative) | |
1588 | num = -num; | |
1589 | return num; | |
1590 | } | |
1591 | ||
914cc65c | 1592 | /** |
6ed6d7f5 WD |
1593 | * Read a line of up to @p maxlen characters into @p buf (not counting |
1594 | * the trailing null). Strips the (required) trailing newline and all | |
1595 | * carriage returns. | |
914cc65c | 1596 | * |
6ed6d7f5 | 1597 | * @return 1 for success; 0 for I/O error or truncation. |
914cc65c | 1598 | **/ |
9dd891bb | 1599 | int read_line(int f, char *buf, size_t maxlen) |
f0fca04e AT |
1600 | { |
1601 | while (maxlen) { | |
528bfcd7 | 1602 | buf[0] = 0; |
f0fca04e | 1603 | read_buf(f, buf, 1); |
914cc65c MP |
1604 | if (buf[0] == 0) |
1605 | return 0; | |
6ed6d7f5 | 1606 | if (buf[0] == '\n') |
f0fca04e | 1607 | break; |
f0fca04e AT |
1608 | if (buf[0] != '\r') { |
1609 | buf++; | |
1610 | maxlen--; | |
1611 | } | |
1612 | } | |
6ed6d7f5 WD |
1613 | *buf = '\0'; |
1614 | return maxlen > 0; | |
f0fca04e AT |
1615 | } |
1616 | ||
f0fca04e AT |
1617 | void io_printf(int fd, const char *format, ...) |
1618 | { | |
d62bcc17 | 1619 | va_list ap; |
33544bf4 | 1620 | char buf[BIGPATHBUFLEN]; |
f0fca04e | 1621 | int len; |
3151cbae | 1622 | |
f0fca04e | 1623 | va_start(ap, format); |
3151cbae | 1624 | len = vsnprintf(buf, sizeof buf, format, ap); |
f0fca04e AT |
1625 | va_end(ap); |
1626 | ||
f89b9368 WD |
1627 | if (len < 0) |
1628 | exit_cleanup(RERR_STREAMIO); | |
f0fca04e | 1629 | |
33544bf4 WD |
1630 | if (len > (int)sizeof buf) { |
1631 | rprintf(FERROR, "io_printf() was too long for the buffer.\n"); | |
1632 | exit_cleanup(RERR_STREAMIO); | |
1633 | } | |
1634 | ||
f0fca04e AT |
1635 | write_sbuf(fd, buf); |
1636 | } | |
8d9dc9f9 | 1637 | |
d17e1dd2 | 1638 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1639 | void io_start_multiplex_out(void) |
8d9dc9f9 | 1640 | { |
d17e1dd2 | 1641 | io_flush(NORMAL_FLUSH); |
8ef246e0 | 1642 | io_start_buffering_out(sock_f_out); |
8d9dc9f9 AT |
1643 | io_multiplexing_out = 1; |
1644 | } | |
1645 | ||
d17e1dd2 | 1646 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1647 | void io_start_multiplex_in(void) |
8d9dc9f9 | 1648 | { |
d17e1dd2 | 1649 | io_flush(NORMAL_FLUSH); |
8ef246e0 | 1650 | io_start_buffering_in(sock_f_in); |
8d9dc9f9 AT |
1651 | io_multiplexing_in = 1; |
1652 | } | |
1653 | ||
d17e1dd2 | 1654 | /** Write an message to the multiplexed data stream. */ |
4a19c3b2 | 1655 | int io_multiplex_write(enum msgcode code, const char *buf, size_t len) |
8d9dc9f9 | 1656 | { |
f89b9368 WD |
1657 | if (!io_multiplexing_out) |
1658 | return 0; | |
d17e1dd2 | 1659 | io_flush(NORMAL_FLUSH); |
1b7c47cb | 1660 | stats.total_written += (len+4); |
3be97bf9 | 1661 | mplex_write(sock_f_out, code, buf, len); |
8d9dc9f9 AT |
1662 | return 1; |
1663 | } | |
1664 | ||
8ef246e0 | 1665 | void io_end_multiplex_in(void) |
7f459268 WD |
1666 | { |
1667 | io_multiplexing_in = 0; | |
8ef246e0 | 1668 | io_end_buffering_in(); |
7f459268 WD |
1669 | } |
1670 | ||
d17e1dd2 | 1671 | /** Stop output multiplexing. */ |
8ef246e0 | 1672 | void io_end_multiplex_out(void) |
554e0a8d AT |
1673 | { |
1674 | io_multiplexing_out = 0; | |
8ef246e0 | 1675 | io_end_buffering_out(); |
554e0a8d AT |
1676 | } |
1677 | ||
b9f592fb WD |
1678 | void start_write_batch(int fd) |
1679 | { | |
1680 | /* Some communication has already taken place, but we don't | |
1681 | * enable batch writing until here so that we can write a | |
1682 | * canonical record of the communication even though the | |
1683 | * actual communication so far depends on whether a daemon | |
1684 | * is involved. */ | |
1685 | write_int(batch_fd, protocol_version); | |
1686 | write_int(batch_fd, checksum_seed); | |
b9f592fb WD |
1687 | |
1688 | if (am_sender) | |
1689 | write_batch_monitor_out = fd; | |
1690 | else | |
1691 | write_batch_monitor_in = fd; | |
1692 | } | |
1693 | ||
1694 | void stop_write_batch(void) | |
1695 | { | |
1696 | write_batch_monitor_out = -1; | |
1697 | write_batch_monitor_in = -1; | |
1698 | } |