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 |
8e41b68e WD |
10 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 3 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 | 19 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 20 | * with this program; if not, visit the http://fsf.org website. |
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 | 30 | #include "rsync.h" |
1b42f628 | 31 | #include "ifuncs.h" |
720b47f2 | 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; |
3ea6e0e7 | 44 | extern int inc_recurse; |
8ef246e0 | 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; |
ba525f77 | 50 | extern int protect_args; |
b9f592fb WD |
51 | extern int checksum_seed; |
52 | extern int protocol_version; | |
47c11975 | 53 | extern int remove_source_files; |
cdf236aa | 54 | extern int preserve_hard_links; |
a800434a | 55 | extern struct stats stats; |
19531e1f | 56 | extern struct file_list *cur_flist; |
332cf6df | 57 | #ifdef ICONV_OPTION |
ba525f77 | 58 | extern int filesfrom_convert; |
332cf6df WD |
59 | extern iconv_t ic_send, ic_recv; |
60 | #endif | |
720b47f2 | 61 | |
a86179f4 | 62 | const char phase_unknown[] = "unknown"; |
9e2409ab | 63 | int ignore_timeout = 0; |
b9f592fb | 64 | int batch_fd = -1; |
04c722d5 | 65 | int msgdone_cnt = 0; |
805edf9d | 66 | |
cb2e1f18 | 67 | /* Ignore an EOF error if non-zero. See whine_about_eof(). */ |
574c2500 | 68 | int kluge_around_eof = 0; |
7a55d06e | 69 | |
d17e1dd2 WD |
70 | int msg_fd_in = -1; |
71 | int msg_fd_out = -1; | |
cdf236aa WD |
72 | int sock_f_in = -1; |
73 | int sock_f_out = -1; | |
7a55d06e | 74 | |
8ef246e0 WD |
75 | static int iobuf_f_in = -1; |
76 | static char *iobuf_in; | |
77 | static size_t iobuf_in_siz; | |
78 | static size_t iobuf_in_ndx; | |
79 | static size_t iobuf_in_remaining; | |
80 | ||
81 | static int iobuf_f_out = -1; | |
82 | static char *iobuf_out; | |
83 | static int iobuf_out_cnt; | |
84 | ||
85 | int flist_forward_from = -1; | |
86 | ||
1f75bb10 WD |
87 | static int io_multiplexing_out; |
88 | static int io_multiplexing_in; | |
3b0a30eb WD |
89 | static time_t last_io_in; |
90 | static time_t last_io_out; | |
1f75bb10 WD |
91 | static int no_flush; |
92 | ||
b9f592fb WD |
93 | static int write_batch_monitor_in = -1; |
94 | static int write_batch_monitor_out = -1; | |
95 | ||
56014c8c WD |
96 | static int io_filesfrom_f_in = -1; |
97 | static int io_filesfrom_f_out = -1; | |
ba525f77 WD |
98 | static xbuf ff_buf = EMPTY_XBUF; |
99 | static char ff_lastchar; | |
332cf6df | 100 | #ifdef ICONV_OPTION |
ba525f77 | 101 | static xbuf iconv_buf = EMPTY_XBUF; |
332cf6df | 102 | #endif |
954bbed8 | 103 | static int defer_forwarding_messages = 0; |
3b0a30eb | 104 | static int select_timeout = SELECT_TIMEOUT; |
d6081c82 WD |
105 | static int active_filecnt = 0; |
106 | static OFF_T active_bytecnt = 0; | |
720b47f2 | 107 | |
351e23ad WD |
108 | static char int_byte_extra[64] = { |
109 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (00 - 3F)/4 */ | |
110 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (40 - 7F)/4 */ | |
111 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* (80 - BF)/4 */ | |
112 | 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6, /* (C0 - FF)/4 */ | |
482f48cc WD |
113 | }; |
114 | ||
29349024 WD |
115 | enum festatus { FES_SUCCESS, FES_REDO, FES_NO_SEND }; |
116 | ||
dde5b772 | 117 | static void readfd(int fd, char *buffer, size_t N); |
8ef246e0 WD |
118 | static void writefd(int fd, const char *buf, size_t len); |
119 | static void writefd_unbuffered(int fd, const char *buf, size_t len); | |
332cf6df | 120 | static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert); |
ff41a59f | 121 | |
c6816b94 WD |
122 | struct flist_ndx_item { |
123 | struct flist_ndx_item *next; | |
124 | int ndx; | |
d17e1dd2 WD |
125 | }; |
126 | ||
c6816b94 WD |
127 | struct flist_ndx_list { |
128 | struct flist_ndx_item *head, *tail; | |
129 | }; | |
130 | ||
cdf236aa | 131 | static struct flist_ndx_list redo_list, hlink_list; |
d17e1dd2 | 132 | |
08c88178 WD |
133 | struct msg_list_item { |
134 | struct msg_list_item *next; | |
332cf6df | 135 | char convert; |
954bbed8 | 136 | char buf[1]; |
d17e1dd2 WD |
137 | }; |
138 | ||
08c88178 WD |
139 | struct msg_list { |
140 | struct msg_list_item *head, *tail; | |
141 | }; | |
142 | ||
e4c877cf | 143 | static struct msg_list msg_queue; |
d17e1dd2 | 144 | |
c6816b94 | 145 | static void flist_ndx_push(struct flist_ndx_list *lp, int ndx) |
d17e1dd2 | 146 | { |
c6816b94 WD |
147 | struct flist_ndx_item *item; |
148 | ||
149 | if (!(item = new(struct flist_ndx_item))) | |
150 | out_of_memory("flist_ndx_push"); | |
151 | item->next = NULL; | |
152 | item->ndx = ndx; | |
153 | if (lp->tail) | |
154 | lp->tail->next = item; | |
d17e1dd2 | 155 | else |
c6816b94 WD |
156 | lp->head = item; |
157 | lp->tail = item; | |
158 | } | |
159 | ||
160 | static int flist_ndx_pop(struct flist_ndx_list *lp) | |
161 | { | |
162 | struct flist_ndx_item *next; | |
163 | int ndx; | |
164 | ||
165 | if (!lp->head) | |
166 | return -1; | |
167 | ||
168 | ndx = lp->head->ndx; | |
169 | next = lp->head->next; | |
170 | free(lp->head); | |
171 | lp->head = next; | |
172 | if (!next) | |
173 | lp->tail = NULL; | |
174 | ||
175 | return ndx; | |
d17e1dd2 WD |
176 | } |
177 | ||
29349024 WD |
178 | static void got_flist_entry_status(enum festatus status, const char *buf) |
179 | { | |
180 | int ndx = IVAL(buf, 0); | |
181 | struct file_list *flist = flist_for_ndx(ndx); | |
182 | ||
183 | assert(flist != NULL); | |
29349024 WD |
184 | |
185 | if (remove_source_files) { | |
186 | active_filecnt--; | |
187 | active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]); | |
188 | } | |
189 | ||
190 | if (inc_recurse) | |
191 | flist->in_progress--; | |
192 | ||
193 | switch (status) { | |
194 | case FES_SUCCESS: | |
195 | if (remove_source_files) | |
196 | send_msg(MSG_SUCCESS, buf, 4, 0); | |
197 | if (preserve_hard_links) { | |
198 | struct file_struct *file = flist->files[ndx - flist->ndx_start]; | |
37ce1679 | 199 | if (F_IS_HLINKED(file)) { |
29349024 | 200 | flist_ndx_push(&hlink_list, ndx); |
37ce1679 WD |
201 | flist->in_progress++; |
202 | } | |
29349024 WD |
203 | } |
204 | break; | |
205 | case FES_REDO: | |
206 | if (inc_recurse) | |
207 | flist->to_redo++; | |
208 | flist_ndx_push(&redo_list, ndx); | |
209 | break; | |
210 | case FES_NO_SEND: | |
211 | break; | |
212 | } | |
213 | } | |
214 | ||
8d9dc9f9 AT |
215 | static void check_timeout(void) |
216 | { | |
217 | time_t t; | |
90ba34e2 | 218 | |
9e2409ab | 219 | if (!io_timeout || ignore_timeout) |
d17e1dd2 | 220 | return; |
8d9dc9f9 | 221 | |
3b0a30eb WD |
222 | if (!last_io_in) { |
223 | last_io_in = time(NULL); | |
8d9dc9f9 AT |
224 | return; |
225 | } | |
226 | ||
227 | t = time(NULL); | |
228 | ||
3b0a30eb | 229 | if (t - last_io_in >= io_timeout) { |
0adb99b9 | 230 | if (!am_server && !am_daemon) { |
4ccfd96c | 231 | rprintf(FERROR, "io timeout after %d seconds -- exiting\n", |
3b0a30eb | 232 | (int)(t-last_io_in)); |
0adb99b9 | 233 | } |
65417579 | 234 | exit_cleanup(RERR_TIMEOUT); |
8d9dc9f9 AT |
235 | } |
236 | } | |
237 | ||
1f75bb10 WD |
238 | /* Note the fds used for the main socket (which might really be a pipe |
239 | * for a local transfer, but we can ignore that). */ | |
240 | void io_set_sock_fds(int f_in, int f_out) | |
241 | { | |
242 | sock_f_in = f_in; | |
243 | sock_f_out = f_out; | |
244 | } | |
245 | ||
3b0a30eb WD |
246 | void set_io_timeout(int secs) |
247 | { | |
248 | io_timeout = secs; | |
249 | ||
250 | if (!io_timeout || io_timeout > SELECT_TIMEOUT) | |
251 | select_timeout = SELECT_TIMEOUT; | |
252 | else | |
253 | select_timeout = io_timeout; | |
254 | ||
255 | allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2; | |
256 | } | |
257 | ||
98f8c9a5 WD |
258 | /* Setup the fd used to receive MSG_* messages. Only needed during the |
259 | * early stages of being a local sender (up through the sending of the | |
260 | * file list) or when we're the generator (to fetch the messages from | |
261 | * the receiver). */ | |
d17e1dd2 WD |
262 | void set_msg_fd_in(int fd) |
263 | { | |
264 | msg_fd_in = fd; | |
265 | } | |
266 | ||
98f8c9a5 WD |
267 | /* Setup the fd used to send our MSG_* messages. Only needed when |
268 | * we're the receiver (to send our messages to the generator). */ | |
d17e1dd2 WD |
269 | void set_msg_fd_out(int fd) |
270 | { | |
271 | msg_fd_out = fd; | |
272 | set_nonblocking(msg_fd_out); | |
273 | } | |
274 | ||
275 | /* Add a message to the pending MSG_* list. */ | |
332cf6df | 276 | static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len, int convert) |
554e0a8d | 277 | { |
954bbed8 WD |
278 | struct msg_list_item *m; |
279 | int sz = len + 4 + sizeof m[0] - 1; | |
d17e1dd2 | 280 | |
954bbed8 | 281 | if (!(m = (struct msg_list_item *)new_array(char, sz))) |
c6816b94 | 282 | out_of_memory("msg_list_add"); |
954bbed8 | 283 | m->next = NULL; |
332cf6df | 284 | m->convert = convert; |
954bbed8 WD |
285 | SIVAL(m->buf, 0, ((code+MPLEX_BASE)<<24) | len); |
286 | memcpy(m->buf + 4, buf, len); | |
287 | if (lst->tail) | |
288 | lst->tail->next = m; | |
d17e1dd2 | 289 | else |
954bbed8 WD |
290 | lst->head = m; |
291 | lst->tail = m; | |
554e0a8d AT |
292 | } |
293 | ||
e4c877cf | 294 | static void msg_flush(void) |
3be97bf9 | 295 | { |
e4c877cf WD |
296 | if (am_generator) { |
297 | while (msg_queue.head && io_multiplexing_out) { | |
298 | struct msg_list_item *m = msg_queue.head; | |
332cf6df WD |
299 | int len = IVAL(m->buf, 0) & 0xFFFFFF; |
300 | int tag = *((uchar*)m->buf+3) - MPLEX_BASE; | |
e4c877cf WD |
301 | if (!(msg_queue.head = m->next)) |
302 | msg_queue.tail = NULL; | |
332cf6df | 303 | stats.total_written += len + 4; |
e4c877cf | 304 | defer_forwarding_messages++; |
332cf6df | 305 | mplex_write(sock_f_out, tag, m->buf + 4, len, m->convert); |
e4c877cf WD |
306 | defer_forwarding_messages--; |
307 | free(m); | |
308 | } | |
309 | } else { | |
310 | while (msg_queue.head) { | |
311 | struct msg_list_item *m = msg_queue.head; | |
332cf6df WD |
312 | int len = IVAL(m->buf, 0) & 0xFFFFFF; |
313 | int tag = *((uchar*)m->buf+3) - MPLEX_BASE; | |
e4c877cf WD |
314 | if (!(msg_queue.head = m->next)) |
315 | msg_queue.tail = NULL; | |
316 | defer_forwarding_messages++; | |
332cf6df | 317 | mplex_write(msg_fd_out, tag, m->buf + 4, len, m->convert); |
e4c877cf WD |
318 | defer_forwarding_messages--; |
319 | free(m); | |
320 | } | |
3be97bf9 WD |
321 | } |
322 | } | |
323 | ||
98f8c9a5 WD |
324 | /* Read a message from the MSG_* fd and handle it. This is called either |
325 | * during the early stages of being a local sender (up through the sending | |
326 | * of the file list) or when we're the generator (to fetch the messages | |
327 | * from the receiver). */ | |
d17e1dd2 | 328 | static void read_msg_fd(void) |
554e0a8d | 329 | { |
f9c6b3e7 | 330 | char buf[2048]; |
06ce139f | 331 | size_t n; |
8ef246e0 | 332 | struct file_list *flist; |
d17e1dd2 | 333 | int fd = msg_fd_in; |
ff41a59f AT |
334 | int tag, len; |
335 | ||
00bdf899 | 336 | /* Temporarily disable msg_fd_in. This is needed to avoid looping back |
af436313 | 337 | * to this routine from writefd_unbuffered(). */ |
3be97bf9 | 338 | no_flush++; |
d17e1dd2 | 339 | msg_fd_in = -1; |
be21e29c | 340 | defer_forwarding_messages++; |
554e0a8d | 341 | |
dde5b772 | 342 | readfd(fd, buf, 4); |
ff41a59f AT |
343 | tag = IVAL(buf, 0); |
344 | ||
345 | len = tag & 0xFFFFFF; | |
d17e1dd2 | 346 | tag = (tag >> 24) - MPLEX_BASE; |
ff41a59f | 347 | |
d17e1dd2 WD |
348 | switch (tag) { |
349 | case MSG_DONE: | |
cc7b86bf | 350 | if (len < 0 || len > 1 || !am_generator) { |
8ef246e0 WD |
351 | invalid_msg: |
352 | rprintf(FERROR, "invalid message %d:%d [%s%s]\n", | |
353 | tag, len, who_am_i(), | |
3ea6e0e7 | 354 | inc_recurse ? "/inc" : ""); |
d17e1dd2 | 355 | exit_cleanup(RERR_STREAMIO); |
13c7bcbb | 356 | } |
cc7b86bf WD |
357 | if (len) { |
358 | readfd(fd, buf, len); | |
351e23ad | 359 | stats.total_read = read_varlong(fd, 3); |
cc7b86bf | 360 | } |
04c722d5 | 361 | msgdone_cnt++; |
d17e1dd2 WD |
362 | break; |
363 | case MSG_REDO: | |
8ef246e0 WD |
364 | if (len != 4 || !am_generator) |
365 | goto invalid_msg; | |
dde5b772 | 366 | readfd(fd, buf, 4); |
29349024 | 367 | got_flist_entry_status(FES_REDO, buf); |
8ef246e0 WD |
368 | break; |
369 | case MSG_FLIST: | |
3ea6e0e7 | 370 | if (len != 4 || !am_generator || !inc_recurse) |
8ef246e0 | 371 | goto invalid_msg; |
dde5b772 | 372 | readfd(fd, buf, 4); |
8ef246e0 WD |
373 | /* Read extra file list from receiver. */ |
374 | assert(iobuf_in != NULL); | |
375 | assert(iobuf_f_in == fd); | |
1faa1a6d WD |
376 | if (verbose > 3) { |
377 | rprintf(FINFO, "[%s] receiving flist for dir %d\n", | |
378 | who_am_i(), IVAL(buf,0)); | |
379 | } | |
8ef246e0 WD |
380 | flist = recv_file_list(fd); |
381 | flist->parent_ndx = IVAL(buf,0); | |
da131912 WD |
382 | #ifdef SUPPORT_HARD_LINKS |
383 | if (preserve_hard_links) | |
384 | match_hard_links(flist); | |
385 | #endif | |
8ef246e0 WD |
386 | break; |
387 | case MSG_FLIST_EOF: | |
3ea6e0e7 | 388 | if (len != 0 || !am_generator || !inc_recurse) |
8ef246e0 WD |
389 | goto invalid_msg; |
390 | flist_eof = 1; | |
d17e1dd2 | 391 | break; |
e5f35681 WD |
392 | case MSG_IO_ERROR: |
393 | if (len != 4) | |
394 | goto invalid_msg; | |
395 | readfd(fd, buf, len); | |
396 | io_error |= IVAL(buf, 0); | |
397 | break; | |
0d67e00a | 398 | case MSG_DELETED: |
8ef246e0 WD |
399 | if (len >= (int)sizeof buf || !am_generator) |
400 | goto invalid_msg; | |
dde5b772 | 401 | readfd(fd, buf, len); |
332cf6df | 402 | send_msg(MSG_DELETED, buf, len, 1); |
0d67e00a | 403 | break; |
9981c27e | 404 | case MSG_SUCCESS: |
8ef246e0 WD |
405 | if (len != 4 || !am_generator) |
406 | goto invalid_msg; | |
29349024 WD |
407 | readfd(fd, buf, 4); |
408 | got_flist_entry_status(FES_SUCCESS, buf); | |
8ef246e0 WD |
409 | break; |
410 | case MSG_NO_SEND: | |
411 | if (len != 4 || !am_generator) | |
412 | goto invalid_msg; | |
29349024 WD |
413 | readfd(fd, buf, 4); |
414 | got_flist_entry_status(FES_NO_SEND, buf); | |
9981c27e | 415 | break; |
72f2d1b3 | 416 | case MSG_SOCKERR: |
64119c79 | 417 | case MSG_CLIENT: |
8ef246e0 WD |
418 | if (!am_generator) |
419 | goto invalid_msg; | |
64119c79 | 420 | if (tag == MSG_SOCKERR) |
8ef246e0 | 421 | io_end_multiplex_out(); |
72f2d1b3 | 422 | /* FALL THROUGH */ |
d17e1dd2 WD |
423 | case MSG_INFO: |
424 | case MSG_ERROR: | |
425 | case MSG_LOG: | |
426 | while (len) { | |
427 | n = len; | |
428 | if (n >= sizeof buf) | |
429 | n = sizeof buf - 1; | |
dde5b772 | 430 | readfd(fd, buf, n); |
332cf6df | 431 | rwrite((enum logcode)tag, buf, n, !am_generator); |
d17e1dd2 WD |
432 | len -= n; |
433 | } | |
434 | break; | |
435 | default: | |
f8b9da1a WD |
436 | rprintf(FERROR, "unknown message %d:%d [%s]\n", |
437 | tag, len, who_am_i()); | |
d17e1dd2 WD |
438 | exit_cleanup(RERR_STREAMIO); |
439 | } | |
440 | ||
3be97bf9 | 441 | no_flush--; |
d17e1dd2 | 442 | msg_fd_in = fd; |
3be97bf9 | 443 | if (!--defer_forwarding_messages) |
e4c877cf | 444 | msg_flush(); |
d17e1dd2 WD |
445 | } |
446 | ||
d6081c82 | 447 | /* This is used by the generator to limit how many file transfers can |
47c11975 | 448 | * be active at once when --remove-source-files is specified. Without |
d6081c82 WD |
449 | * this, sender-side deletions were mostly happening at the end. */ |
450 | void increment_active_files(int ndx, int itemizing, enum logcode code) | |
451 | { | |
452 | /* TODO: tune these limits? */ | |
5b986297 | 453 | while (active_filecnt >= (active_bytecnt >= 128*1024 ? 10 : 50)) { |
04c722d5 WD |
454 | check_for_finished_files(itemizing, code, 0); |
455 | if (iobuf_out_cnt) | |
456 | io_flush(NORMAL_FLUSH); | |
457 | else | |
458 | read_msg_fd(); | |
d6081c82 WD |
459 | } |
460 | ||
461 | active_filecnt++; | |
121bfb2b | 462 | active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]); |
d6081c82 WD |
463 | } |
464 | ||
3be97bf9 | 465 | /* Write an message to a multiplexed stream. If this fails, rsync exits. */ |
332cf6df | 466 | static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert) |
d17e1dd2 | 467 | { |
332cf6df | 468 | char buffer[BIGPATHBUFLEN]; /* Oversized for use by iconv code. */ |
3be97bf9 | 469 | size_t n = len; |
d17e1dd2 | 470 | |
3be97bf9 WD |
471 | SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); |
472 | ||
332cf6df WD |
473 | #ifdef ICONV_OPTION |
474 | if (convert && ic_send == (iconv_t)-1) | |
475 | #endif | |
476 | convert = 0; | |
477 | ||
478 | if (convert || n > 1024 - 4) /* BIGPATHBUFLEN can handle 1024 bytes */ | |
3be97bf9 WD |
479 | n = 0; |
480 | else | |
481 | memcpy(buffer + 4, buf, n); | |
482 | ||
483 | writefd_unbuffered(fd, buffer, n+4); | |
484 | ||
485 | len -= n; | |
486 | buf += n; | |
487 | ||
332cf6df WD |
488 | #ifdef ICONV_OPTION |
489 | if (convert) { | |
ba525f77 WD |
490 | xbuf outbuf, inbuf; |
491 | ||
492 | INIT_CONST_XBUF(outbuf, buffer); | |
493 | INIT_XBUF(inbuf, (char*)buf, len, -1); | |
494 | ||
332cf6df | 495 | defer_forwarding_messages++; |
ba525f77 WD |
496 | do { |
497 | iconvbufs(ic_send, &inbuf, &outbuf, | |
498 | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE); | |
499 | writefd_unbuffered(fd, outbuf.buf, outbuf.len); | |
500 | } while (inbuf.len); | |
332cf6df WD |
501 | if (!--defer_forwarding_messages) |
502 | msg_flush(); | |
503 | } else | |
504 | #endif | |
3be97bf9 WD |
505 | if (len) { |
506 | defer_forwarding_messages++; | |
507 | writefd_unbuffered(fd, buf, len); | |
508 | if (!--defer_forwarding_messages) | |
e4c877cf | 509 | msg_flush(); |
8ef246e0 | 510 | } |
d17e1dd2 WD |
511 | } |
512 | ||
332cf6df | 513 | int send_msg(enum msgcode code, const char *buf, int len, int convert) |
37f35d89 WD |
514 | { |
515 | if (msg_fd_out < 0) { | |
12ccc73a | 516 | if (!defer_forwarding_messages) |
332cf6df | 517 | return io_multiplex_write(code, buf, len, convert); |
12ccc73a WD |
518 | if (!io_multiplexing_out) |
519 | return 0; | |
332cf6df | 520 | msg_list_add(&msg_queue, code, buf, len, convert); |
12ccc73a | 521 | return 1; |
37f35d89 | 522 | } |
e4c877cf | 523 | if (flist_forward_from >= 0) |
332cf6df | 524 | msg_list_add(&msg_queue, code, buf, len, convert); |
e4c877cf | 525 | else |
332cf6df | 526 | mplex_write(msg_fd_out, code, buf, len, convert); |
12ccc73a | 527 | return 1; |
37f35d89 WD |
528 | } |
529 | ||
155d9206 WD |
530 | void send_msg_int(enum msgcode code, int num) |
531 | { | |
532 | char numbuf[4]; | |
533 | SIVAL(numbuf, 0, num); | |
332cf6df | 534 | send_msg(code, numbuf, 4, 0); |
155d9206 WD |
535 | } |
536 | ||
8ef246e0 | 537 | void wait_for_receiver(void) |
d17e1dd2 | 538 | { |
2a5df862 WD |
539 | if (iobuf_out_cnt) |
540 | io_flush(NORMAL_FLUSH); | |
541 | else | |
542 | read_msg_fd(); | |
8ef246e0 | 543 | } |
554e0a8d | 544 | |
8ef246e0 WD |
545 | int get_redo_num(void) |
546 | { | |
c6816b94 | 547 | return flist_ndx_pop(&redo_list); |
554e0a8d AT |
548 | } |
549 | ||
cdf236aa WD |
550 | int get_hlink_num(void) |
551 | { | |
552 | return flist_ndx_pop(&hlink_list); | |
553 | } | |
554 | ||
56014c8c WD |
555 | /** |
556 | * When we're the receiver and we have a local --files-from list of names | |
557 | * that needs to be sent over the socket to the sender, we have to do two | |
558 | * things at the same time: send the sender a list of what files we're | |
559 | * processing and read the incoming file+info list from the sender. We do | |
560 | * this by augmenting the read_timeout() function to copy this data. It | |
ba525f77 WD |
561 | * uses ff_buf to read a block of data from f_in (when it is ready, since |
562 | * it might be a pipe) and then blast it out f_out (when it is ready to | |
563 | * receive more data). | |
56014c8c WD |
564 | */ |
565 | void io_set_filesfrom_fds(int f_in, int f_out) | |
566 | { | |
567 | io_filesfrom_f_in = f_in; | |
568 | io_filesfrom_f_out = f_out; | |
ba525f77 WD |
569 | alloc_xbuf(&ff_buf, 2048); |
570 | #ifdef ICONV_OPTION | |
571 | if (protect_args) | |
572 | alloc_xbuf(&iconv_buf, 1024); | |
573 | #endif | |
56014c8c | 574 | } |
720b47f2 | 575 | |
cb2e1f18 WD |
576 | /* It's almost always an error to get an EOF when we're trying to read from the |
577 | * network, because the protocol is (for the most part) self-terminating. | |
880da007 | 578 | * |
cb2e1f18 WD |
579 | * There is one case for the receiver when it is at the end of the transfer |
580 | * (hanging around reading any keep-alive packets that might come its way): if | |
581 | * the sender dies before the generator's kill-signal comes through, we can end | |
582 | * up here needing to loop until the kill-signal arrives. In this situation, | |
583 | * kluge_around_eof will be < 0. | |
584 | * | |
585 | * There is another case for older protocol versions (< 24) where the module | |
586 | * listing was not terminated, so we must ignore an EOF error in that case and | |
587 | * exit. In this situation, kluge_around_eof will be > 0. */ | |
1f75bb10 | 588 | static void whine_about_eof(int fd) |
7a55d06e | 589 | { |
574c2500 | 590 | if (kluge_around_eof && fd == sock_f_in) { |
55bb7fff | 591 | int i; |
574c2500 WD |
592 | if (kluge_around_eof > 0) |
593 | exit_cleanup(0); | |
55bb7fff WD |
594 | /* If we're still here after 10 seconds, exit with an error. */ |
595 | for (i = 10*1000/20; i--; ) | |
574c2500 WD |
596 | msleep(20); |
597 | } | |
3151cbae | 598 | |
00bdf899 | 599 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
dca68b0a WD |
600 | "(%.0f bytes received so far) [%s]\n", |
601 | (double)stats.total_read, who_am_i()); | |
00bdf899 WD |
602 | |
603 | exit_cleanup(RERR_STREAMIO); | |
7a55d06e | 604 | } |
720b47f2 | 605 | |
880da007 | 606 | /** |
6ed6d7f5 | 607 | * Read from a socket with I/O timeout. return the number of bytes |
c3563c46 MP |
608 | * read. If no bytes can be read then exit, never return a number <= 0. |
609 | * | |
8886f8d0 MP |
610 | * TODO: If the remote shell connection fails, then current versions |
611 | * actually report an "unexpected EOF" error here. Since it's a | |
612 | * fairly common mistake to try to use rsh when ssh is required, we | |
613 | * should trap that: if we fail to read any data at all, we should | |
614 | * give a better explanation. We can tell whether the connection has | |
615 | * started by looking e.g. at whether the remote version is known yet. | |
c3563c46 | 616 | */ |
3151cbae | 617 | static int read_timeout(int fd, char *buf, size_t len) |
8d9dc9f9 | 618 | { |
d8aeda1e | 619 | int n, cnt = 0; |
4c36ddbe | 620 | |
dde5b772 | 621 | io_flush(FULL_FLUSH); |
ea2111d1 | 622 | |
d8aeda1e | 623 | while (cnt == 0) { |
7a55d06e | 624 | /* until we manage to read *something* */ |
56014c8c | 625 | fd_set r_fds, w_fds; |
4c36ddbe | 626 | struct timeval tv; |
1ea087a7 | 627 | int maxfd = fd; |
a57873b7 | 628 | int count; |
4c36ddbe | 629 | |
56014c8c | 630 | FD_ZERO(&r_fds); |
a7026ba9 | 631 | FD_ZERO(&w_fds); |
56014c8c | 632 | FD_SET(fd, &r_fds); |
3309507d | 633 | if (io_filesfrom_f_out >= 0) { |
56014c8c | 634 | int new_fd; |
ba525f77 | 635 | if (ff_buf.len == 0) { |
3309507d | 636 | if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
637 | FD_SET(io_filesfrom_f_in, &r_fds); |
638 | new_fd = io_filesfrom_f_in; | |
639 | } else { | |
640 | io_filesfrom_f_out = -1; | |
641 | new_fd = -1; | |
642 | } | |
643 | } else { | |
56014c8c WD |
644 | FD_SET(io_filesfrom_f_out, &w_fds); |
645 | new_fd = io_filesfrom_f_out; | |
646 | } | |
1ea087a7 WD |
647 | if (new_fd > maxfd) |
648 | maxfd = new_fd; | |
554e0a8d AT |
649 | } |
650 | ||
e626b29e | 651 | tv.tv_sec = select_timeout; |
4c36ddbe AT |
652 | tv.tv_usec = 0; |
653 | ||
554e0a8d AT |
654 | errno = 0; |
655 | ||
a7026ba9 | 656 | count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); |
a57873b7 | 657 | |
a57873b7 | 658 | if (count <= 0) { |
2a5df862 WD |
659 | if (errno == EBADF) { |
660 | defer_forwarding_messages = 0; | |
554e0a8d | 661 | exit_cleanup(RERR_SOCKETIO); |
2a5df862 | 662 | } |
bd717af8 | 663 | check_timeout(); |
4c36ddbe AT |
664 | continue; |
665 | } | |
666 | ||
3309507d | 667 | if (io_filesfrom_f_out >= 0) { |
ba525f77 | 668 | if (ff_buf.len) { |
56014c8c WD |
669 | if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { |
670 | int l = write(io_filesfrom_f_out, | |
ba525f77 WD |
671 | ff_buf.buf + ff_buf.pos, |
672 | ff_buf.len); | |
56014c8c | 673 | if (l > 0) { |
ba525f77 WD |
674 | if (!(ff_buf.len -= l)) |
675 | ff_buf.pos = 0; | |
56014c8c | 676 | else |
ba525f77 | 677 | ff_buf.pos += l; |
47cffb77 | 678 | } else if (errno != EINTR) { |
56014c8c WD |
679 | /* XXX should we complain? */ |
680 | io_filesfrom_f_out = -1; | |
681 | } | |
682 | } | |
3309507d | 683 | } else if (io_filesfrom_f_in >= 0) { |
56014c8c | 684 | if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { |
22955408 | 685 | #ifdef ICONV_OPTION |
ba525f77 | 686 | xbuf *ibuf = filesfrom_convert ? &iconv_buf : &ff_buf; |
22955408 WD |
687 | #else |
688 | xbuf *ibuf = &ff_buf; | |
689 | #endif | |
ba525f77 | 690 | int l = read(io_filesfrom_f_in, ibuf->buf, ibuf->size); |
56014c8c | 691 | if (l <= 0) { |
47cffb77 WD |
692 | if (l == 0 || errno != EINTR) { |
693 | /* Send end-of-file marker */ | |
ba525f77 WD |
694 | memcpy(ff_buf.buf, "\0\0", 2); |
695 | ff_buf.len = ff_lastchar? 2 : 1; | |
696 | ff_buf.pos = 0; | |
47cffb77 WD |
697 | io_filesfrom_f_in = -1; |
698 | } | |
56014c8c | 699 | } else { |
22955408 | 700 | #ifdef ICONV_OPTION |
ba525f77 WD |
701 | if (filesfrom_convert) { |
702 | iconv_buf.pos = 0; | |
703 | iconv_buf.len = l; | |
704 | iconvbufs(ic_send, &iconv_buf, &ff_buf, | |
705 | ICB_EXPAND_OUT|ICB_INCLUDE_BAD|ICB_INCLUDE_INCOMPLETE); | |
706 | l = ff_buf.len; | |
707 | } | |
22955408 | 708 | #endif |
56014c8c | 709 | if (!eol_nulls) { |
ba525f77 | 710 | char *s = ff_buf.buf + l; |
56014c8c | 711 | /* Transform CR and/or LF into '\0' */ |
ba525f77 | 712 | while (s-- > ff_buf.buf) { |
56014c8c WD |
713 | if (*s == '\n' || *s == '\r') |
714 | *s = '\0'; | |
715 | } | |
716 | } | |
ba525f77 | 717 | if (!ff_lastchar) { |
56014c8c WD |
718 | /* Last buf ended with a '\0', so don't |
719 | * let this buf start with one. */ | |
ba525f77 WD |
720 | while (l && ff_buf.buf[ff_buf.pos] == '\0') |
721 | ff_buf.pos++, l--; | |
56014c8c WD |
722 | } |
723 | if (!l) | |
ba525f77 | 724 | ff_buf.pos = 0; |
56014c8c | 725 | else { |
ba525f77 | 726 | char *f = ff_buf.buf + ff_buf.pos; |
56014c8c WD |
727 | char *t = f; |
728 | char *eob = f + l; | |
729 | /* Eliminate any multi-'\0' runs. */ | |
730 | while (f != eob) { | |
731 | if (!(*t++ = *f++)) { | |
732 | while (f != eob && !*f) | |
733 | f++, l--; | |
734 | } | |
735 | } | |
ba525f77 | 736 | ff_lastchar = f[-1]; |
56014c8c | 737 | } |
ba525f77 | 738 | ff_buf.len = l; |
56014c8c WD |
739 | } |
740 | } | |
741 | } | |
742 | } | |
743 | ||
f89b9368 WD |
744 | if (!FD_ISSET(fd, &r_fds)) |
745 | continue; | |
554e0a8d | 746 | |
4c36ddbe AT |
747 | n = read(fd, buf, len); |
748 | ||
1ea087a7 WD |
749 | if (n <= 0) { |
750 | if (n == 0) | |
1f75bb10 | 751 | whine_about_eof(fd); /* Doesn't return. */ |
d62bcc17 WD |
752 | if (errno == EINTR || errno == EWOULDBLOCK |
753 | || errno == EAGAIN) | |
7a55d06e | 754 | continue; |
1f75bb10 WD |
755 | |
756 | /* Don't write errors on a dead socket. */ | |
72f2d1b3 | 757 | if (fd == sock_f_in) { |
8ef246e0 | 758 | io_end_multiplex_out(); |
72f2d1b3 WD |
759 | rsyserr(FSOCKERR, errno, "read error"); |
760 | } else | |
761 | rsyserr(FERROR, errno, "read error"); | |
1f75bb10 | 762 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 763 | } |
00bdf899 WD |
764 | |
765 | buf += n; | |
766 | len -= n; | |
d8aeda1e | 767 | cnt += n; |
1f75bb10 | 768 | |
3b0a30eb WD |
769 | if (fd == sock_f_in && io_timeout) |
770 | last_io_in = time(NULL); | |
4c36ddbe | 771 | } |
8d9dc9f9 | 772 | |
d8aeda1e | 773 | return cnt; |
4c36ddbe | 774 | } |
8d9dc9f9 | 775 | |
67b8f3df | 776 | /* Read a line into the "buf" buffer. */ |
ba525f77 | 777 | int read_line(int fd, char *buf, size_t bufsiz, int flags) |
56014c8c | 778 | { |
ba525f77 | 779 | char ch, *s, *eob; |
56014c8c | 780 | int cnt; |
56014c8c | 781 | |
ba525f77 WD |
782 | #ifdef ICONV_OPTION |
783 | if (flags & RL_CONVERT && iconv_buf.size < bufsiz) | |
784 | realloc_xbuf(&iconv_buf, bufsiz + 1024); | |
785 | #endif | |
786 | ||
56014c8c | 787 | start: |
22955408 | 788 | #ifdef ICONV_OPTION |
ba525f77 | 789 | s = flags & RL_CONVERT ? iconv_buf.buf : buf; |
22955408 WD |
790 | #else |
791 | s = buf; | |
792 | #endif | |
ba525f77 | 793 | eob = s + bufsiz - 1; |
56014c8c WD |
794 | while (1) { |
795 | cnt = read(fd, &ch, 1); | |
796 | if (cnt < 0 && (errno == EWOULDBLOCK | |
797 | || errno == EINTR || errno == EAGAIN)) { | |
798 | struct timeval tv; | |
6c850772 WD |
799 | fd_set r_fds, e_fds; |
800 | FD_ZERO(&r_fds); | |
801 | FD_SET(fd, &r_fds); | |
802 | FD_ZERO(&e_fds); | |
803 | FD_SET(fd, &e_fds); | |
e626b29e | 804 | tv.tv_sec = select_timeout; |
56014c8c | 805 | tv.tv_usec = 0; |
6c850772 | 806 | if (!select(fd+1, &r_fds, NULL, &e_fds, &tv)) |
56014c8c | 807 | check_timeout(); |
35c8fd76 WD |
808 | /*if (FD_ISSET(fd, &e_fds)) |
809 | rprintf(FINFO, "select exception on fd %d\n", fd); */ | |
56014c8c WD |
810 | continue; |
811 | } | |
812 | if (cnt != 1) | |
813 | break; | |
ba525f77 | 814 | if (flags & RL_EOL_NULLS ? ch == '\0' : (ch == '\r' || ch == '\n')) { |
67b8f3df | 815 | /* Skip empty lines if dumping comments. */ |
ba525f77 | 816 | if (flags & RL_DUMP_COMMENTS && s == buf) |
56014c8c WD |
817 | continue; |
818 | break; | |
819 | } | |
820 | if (s < eob) | |
821 | *s++ = ch; | |
822 | } | |
823 | *s = '\0'; | |
7a55d06e | 824 | |
ba525f77 | 825 | if (flags & RL_DUMP_COMMENTS && (*buf == '#' || *buf == ';')) |
56014c8c WD |
826 | goto start; |
827 | ||
ba525f77 WD |
828 | #ifdef ICONV_OPTION |
829 | if (flags & RL_CONVERT) { | |
830 | xbuf outbuf; | |
831 | INIT_XBUF(outbuf, buf, 0, bufsiz); | |
832 | iconv_buf.pos = 0; | |
833 | iconv_buf.len = s - iconv_buf.buf; | |
834 | iconvbufs(ic_recv, &iconv_buf, &outbuf, | |
835 | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE); | |
836 | outbuf.buf[outbuf.len] = '\0'; | |
837 | return outbuf.len; | |
838 | } | |
839 | #endif | |
840 | ||
67b8f3df WD |
841 | return s - buf; |
842 | } | |
843 | ||
844 | int read_args(int f_in, char *mod_name, char *buf, size_t bufsiz, int rl_nulls, | |
845 | char ***argv_p, int *argc_p, char **request_p) | |
846 | { | |
847 | int maxargs = MAX_ARGS; | |
848 | int dot_pos = 0; | |
849 | int argc = 0; | |
850 | char **argv, *p; | |
22955408 WD |
851 | int rl_flags = (rl_nulls ? RL_EOL_NULLS : 0); |
852 | ||
853 | #ifdef ICONV_OPTION | |
854 | rl_flags |= (protect_args && ic_recv != (iconv_t)-1 ? RL_CONVERT : 0); | |
855 | #endif | |
67b8f3df WD |
856 | |
857 | if (!(argv = new_array(char *, maxargs))) | |
858 | out_of_memory("read_args"); | |
859 | if (mod_name) | |
860 | argv[argc++] = "rsyncd"; | |
861 | ||
862 | while (1) { | |
ba525f77 | 863 | if (read_line(f_in, buf, bufsiz, rl_flags) == 0) |
67b8f3df WD |
864 | break; |
865 | ||
866 | if (argc == maxargs) { | |
867 | maxargs += MAX_ARGS; | |
868 | if (!(argv = realloc_array(argv, char *, maxargs))) | |
869 | out_of_memory("read_args"); | |
870 | } | |
871 | ||
872 | if (dot_pos) { | |
873 | if (request_p) { | |
874 | *request_p = strdup(buf); | |
875 | request_p = NULL; | |
876 | } | |
877 | if (mod_name) | |
878 | glob_expand_module(mod_name, buf, &argv, &argc, &maxargs); | |
879 | else | |
880 | glob_expand(buf, &argv, &argc, &maxargs); | |
881 | } else { | |
882 | if (!(p = strdup(buf))) | |
883 | out_of_memory("read_args"); | |
884 | argv[argc++] = p; | |
885 | if (*p == '.' && p[1] == '\0') | |
886 | dot_pos = argc; | |
887 | } | |
888 | } | |
889 | ||
890 | *argc_p = argc; | |
891 | *argv_p = argv; | |
892 | ||
893 | return dot_pos ? dot_pos : argc; | |
56014c8c | 894 | } |
7a55d06e | 895 | |
8ef246e0 | 896 | int io_start_buffering_out(int f_out) |
1f75bb10 | 897 | { |
8ef246e0 WD |
898 | if (iobuf_out) { |
899 | assert(f_out == iobuf_f_out); | |
900 | return 0; | |
901 | } | |
1f75bb10 WD |
902 | if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) |
903 | out_of_memory("io_start_buffering_out"); | |
904 | iobuf_out_cnt = 0; | |
8ef246e0 WD |
905 | iobuf_f_out = f_out; |
906 | return 1; | |
1f75bb10 WD |
907 | } |
908 | ||
8ef246e0 | 909 | int io_start_buffering_in(int f_in) |
1f75bb10 | 910 | { |
8ef246e0 WD |
911 | if (iobuf_in) { |
912 | assert(f_in == iobuf_f_in); | |
913 | return 0; | |
914 | } | |
1f75bb10 WD |
915 | iobuf_in_siz = 2 * IO_BUFFER_SIZE; |
916 | if (!(iobuf_in = new_array(char, iobuf_in_siz))) | |
917 | out_of_memory("io_start_buffering_in"); | |
8ef246e0 WD |
918 | iobuf_f_in = f_in; |
919 | return 1; | |
1f75bb10 WD |
920 | } |
921 | ||
8ef246e0 | 922 | void io_end_buffering_in(void) |
1f75bb10 | 923 | { |
8ef246e0 WD |
924 | if (!iobuf_in) |
925 | return; | |
926 | free(iobuf_in); | |
927 | iobuf_in = NULL; | |
928 | iobuf_in_ndx = 0; | |
929 | iobuf_in_remaining = 0; | |
930 | iobuf_f_in = -1; | |
931 | } | |
932 | ||
933 | void io_end_buffering_out(void) | |
934 | { | |
935 | if (!iobuf_out) | |
936 | return; | |
937 | io_flush(FULL_FLUSH); | |
938 | free(iobuf_out); | |
939 | iobuf_out = NULL; | |
940 | iobuf_f_out = -1; | |
1f75bb10 WD |
941 | } |
942 | ||
be91bd81 | 943 | void maybe_flush_socket(int important) |
626bec8e | 944 | { |
be91bd81 WD |
945 | if (iobuf_out && iobuf_out_cnt |
946 | && (important || time(NULL) - last_io_out >= 5)) | |
626bec8e WD |
947 | io_flush(NORMAL_FLUSH); |
948 | } | |
949 | ||
cdf236aa | 950 | void maybe_send_keepalive(void) |
9e2409ab | 951 | { |
3b0a30eb | 952 | if (time(NULL) - last_io_out >= allowed_lull) { |
9e2409ab | 953 | if (!iobuf_out || !iobuf_out_cnt) { |
3221f451 WD |
954 | if (protocol_version < 29) |
955 | return; /* there's nothing we can do */ | |
8ef246e0 | 956 | if (protocol_version >= 30) |
332cf6df | 957 | send_msg(MSG_NOOP, "", 0, 0); |
8ef246e0 | 958 | else { |
9decb4d2 | 959 | write_int(sock_f_out, cur_flist->used); |
8ef246e0 WD |
960 | write_shortint(sock_f_out, ITEM_IS_NEW); |
961 | } | |
9e2409ab WD |
962 | } |
963 | if (iobuf_out) | |
964 | io_flush(NORMAL_FLUSH); | |
965 | } | |
966 | } | |
967 | ||
8ef246e0 WD |
968 | void start_flist_forward(int f_in) |
969 | { | |
970 | assert(iobuf_out != NULL); | |
971 | assert(iobuf_f_out == msg_fd_out); | |
972 | flist_forward_from = f_in; | |
973 | } | |
974 | ||
975 | void stop_flist_forward() | |
976 | { | |
8ef246e0 | 977 | flist_forward_from = -1; |
dde5b772 | 978 | io_flush(FULL_FLUSH); |
8ef246e0 WD |
979 | } |
980 | ||
880da007 MP |
981 | /** |
982 | * Continue trying to read len bytes - don't return until len has been | |
983 | * read. | |
984 | **/ | |
3151cbae | 985 | static void read_loop(int fd, char *buf, size_t len) |
4c36ddbe AT |
986 | { |
987 | while (len) { | |
988 | int n = read_timeout(fd, buf, len); | |
989 | ||
990 | buf += n; | |
991 | len -= n; | |
8d9dc9f9 AT |
992 | } |
993 | } | |
994 | ||
7a55d06e MP |
995 | /** |
996 | * Read from the file descriptor handling multiplexing - return number | |
997 | * of bytes read. | |
d62bcc17 WD |
998 | * |
999 | * Never returns <= 0. | |
7a55d06e | 1000 | */ |
c399d22a | 1001 | static int readfd_unbuffered(int fd, char *buf, size_t len) |
8d9dc9f9 | 1002 | { |
f2a4853c | 1003 | size_t msg_bytes; |
d8aeda1e | 1004 | int tag, cnt = 0; |
33544bf4 | 1005 | char line[BIGPATHBUFLEN]; |
8d9dc9f9 | 1006 | |
8ef246e0 | 1007 | if (!iobuf_in || fd != iobuf_f_in) |
4c36ddbe | 1008 | return read_timeout(fd, buf, len); |
8d9dc9f9 | 1009 | |
8ef246e0 WD |
1010 | if (!io_multiplexing_in && iobuf_in_remaining == 0) { |
1011 | iobuf_in_remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); | |
1f75bb10 | 1012 | iobuf_in_ndx = 0; |
76c21947 WD |
1013 | } |
1014 | ||
d8aeda1e | 1015 | while (cnt == 0) { |
8ef246e0 WD |
1016 | if (iobuf_in_remaining) { |
1017 | len = MIN(len, iobuf_in_remaining); | |
1f75bb10 WD |
1018 | memcpy(buf, iobuf_in + iobuf_in_ndx, len); |
1019 | iobuf_in_ndx += len; | |
8ef246e0 | 1020 | iobuf_in_remaining -= len; |
d8aeda1e | 1021 | cnt = len; |
76c21947 | 1022 | break; |
8d9dc9f9 AT |
1023 | } |
1024 | ||
909ce14f | 1025 | read_loop(fd, line, 4); |
ff41a59f | 1026 | tag = IVAL(line, 0); |
679e7657 | 1027 | |
f2a4853c | 1028 | msg_bytes = tag & 0xFFFFFF; |
d17e1dd2 | 1029 | tag = (tag >> 24) - MPLEX_BASE; |
8d9dc9f9 | 1030 | |
d17e1dd2 WD |
1031 | switch (tag) { |
1032 | case MSG_DATA: | |
f2a4853c | 1033 | if (msg_bytes > iobuf_in_siz) { |
1f75bb10 | 1034 | if (!(iobuf_in = realloc_array(iobuf_in, char, |
f2a4853c | 1035 | msg_bytes))) |
c399d22a | 1036 | out_of_memory("readfd_unbuffered"); |
f2a4853c | 1037 | iobuf_in_siz = msg_bytes; |
76c21947 | 1038 | } |
f2a4853c | 1039 | read_loop(fd, iobuf_in, msg_bytes); |
8ef246e0 | 1040 | iobuf_in_remaining = msg_bytes; |
1f75bb10 | 1041 | iobuf_in_ndx = 0; |
d17e1dd2 | 1042 | break; |
8ef246e0 WD |
1043 | case MSG_NOOP: |
1044 | if (am_sender) | |
1045 | maybe_send_keepalive(); | |
1046 | break; | |
1047 | case MSG_IO_ERROR: | |
1048 | if (msg_bytes != 4) | |
1049 | goto invalid_msg; | |
1050 | read_loop(fd, line, msg_bytes); | |
e5f35681 | 1051 | send_msg_int(MSG_IO_ERROR, IVAL(line, 0)); |
8ef246e0 WD |
1052 | io_error |= IVAL(line, 0); |
1053 | break; | |
0d67e00a | 1054 | case MSG_DELETED: |
f2a4853c WD |
1055 | if (msg_bytes >= sizeof line) |
1056 | goto overflow; | |
332cf6df WD |
1057 | #ifdef ICONV_OPTION |
1058 | if (ic_recv != (iconv_t)-1) { | |
ba525f77 WD |
1059 | xbuf outbuf, inbuf; |
1060 | char ibuf[512]; | |
332cf6df | 1061 | int add_null = 0; |
ba525f77 WD |
1062 | int pos = 0; |
1063 | ||
1064 | INIT_CONST_XBUF(outbuf, line); | |
1065 | inbuf.buf = ibuf; | |
1066 | ||
332cf6df | 1067 | while (msg_bytes) { |
ba525f77 WD |
1068 | inbuf.len = msg_bytes > sizeof ibuf |
1069 | ? sizeof ibuf : msg_bytes; | |
1070 | read_loop(fd, inbuf.buf, inbuf.len); | |
1071 | if (!(msg_bytes -= inbuf.len) | |
1072 | && !ibuf[inbuf.len-1]) | |
1073 | inbuf.len--, add_null = 1; | |
1074 | if (iconvbufs(ic_send, &inbuf, &outbuf, | |
1075 | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE) < 0) | |
1076 | goto overflow; | |
1077 | pos = -1; | |
1078 | } | |
1079 | if (add_null) { | |
1080 | if (outbuf.len == outbuf.size) | |
1081 | goto overflow; | |
1082 | outbuf.buf[outbuf.len++] = '\0'; | |
332cf6df | 1083 | } |
ba525f77 | 1084 | msg_bytes = outbuf.len; |
332cf6df WD |
1085 | } else |
1086 | #endif | |
1087 | read_loop(fd, line, msg_bytes); | |
0d67e00a | 1088 | /* A directory name was sent with the trailing null */ |
f2a4853c | 1089 | if (msg_bytes > 0 && !line[msg_bytes-1]) |
0d67e00a | 1090 | log_delete(line, S_IFDIR); |
12bda6f7 WD |
1091 | else { |
1092 | line[msg_bytes] = '\0'; | |
0d67e00a | 1093 | log_delete(line, S_IFREG); |
12bda6f7 | 1094 | } |
0d67e00a | 1095 | break; |
9981c27e | 1096 | case MSG_SUCCESS: |
f2a4853c | 1097 | if (msg_bytes != 4) { |
8ef246e0 | 1098 | invalid_msg: |
cdf236aa | 1099 | rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n", |
f2a4853c | 1100 | tag, (long)msg_bytes, who_am_i()); |
9981c27e WD |
1101 | exit_cleanup(RERR_STREAMIO); |
1102 | } | |
f2a4853c | 1103 | read_loop(fd, line, msg_bytes); |
9981c27e | 1104 | successful_send(IVAL(line, 0)); |
9981c27e | 1105 | break; |
8ef246e0 WD |
1106 | case MSG_NO_SEND: |
1107 | if (msg_bytes != 4) | |
1108 | goto invalid_msg; | |
1109 | read_loop(fd, line, msg_bytes); | |
1110 | send_msg_int(MSG_NO_SEND, IVAL(line, 0)); | |
1111 | break; | |
d17e1dd2 WD |
1112 | case MSG_INFO: |
1113 | case MSG_ERROR: | |
f2a4853c WD |
1114 | if (msg_bytes >= sizeof line) { |
1115 | overflow: | |
bd9fca47 | 1116 | rprintf(FERROR, |
cdf236aa | 1117 | "multiplexing overflow %d:%ld [%s]\n", |
f2a4853c | 1118 | tag, (long)msg_bytes, who_am_i()); |
d17e1dd2 WD |
1119 | exit_cleanup(RERR_STREAMIO); |
1120 | } | |
f2a4853c | 1121 | read_loop(fd, line, msg_bytes); |
332cf6df | 1122 | rwrite((enum logcode)tag, line, msg_bytes, 1); |
d17e1dd2 WD |
1123 | break; |
1124 | default: | |
cdf236aa WD |
1125 | rprintf(FERROR, "unexpected tag %d [%s]\n", |
1126 | tag, who_am_i()); | |
65417579 | 1127 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 1128 | } |
8d9dc9f9 AT |
1129 | } |
1130 | ||
8ef246e0 | 1131 | if (iobuf_in_remaining == 0) |
d17e1dd2 | 1132 | io_flush(NORMAL_FLUSH); |
76c21947 | 1133 | |
d8aeda1e | 1134 | return cnt; |
8d9dc9f9 AT |
1135 | } |
1136 | ||
dde5b772 WD |
1137 | /* Do a buffered read from fd. Don't return until all N bytes have |
1138 | * been read. If all N can't be read then exit with an error. */ | |
3151cbae | 1139 | static void readfd(int fd, char *buffer, size_t N) |
720b47f2 | 1140 | { |
d8aeda1e | 1141 | int cnt; |
d62bcc17 | 1142 | size_t total = 0; |
3151cbae | 1143 | |
6ba9279f | 1144 | while (total < N) { |
d8aeda1e WD |
1145 | cnt = readfd_unbuffered(fd, buffer + total, N-total); |
1146 | total += cnt; | |
7f28dbee | 1147 | } |
1b7c47cb | 1148 | |
b9f592fb WD |
1149 | if (fd == write_batch_monitor_in) { |
1150 | if ((size_t)write(batch_fd, buffer, total) != total) | |
1151 | exit_cleanup(RERR_FILEIO); | |
1152 | } | |
1f75bb10 | 1153 | |
8ef246e0 WD |
1154 | if (fd == flist_forward_from) |
1155 | writefd(iobuf_f_out, buffer, total); | |
1156 | ||
1f75bb10 WD |
1157 | if (fd == sock_f_in) |
1158 | stats.total_read += total; | |
720b47f2 AT |
1159 | } |
1160 | ||
3a993aa4 | 1161 | unsigned short read_shortint(int f) |
9361f839 | 1162 | { |
482f48cc WD |
1163 | char b[2]; |
1164 | readfd(f, b, 2); | |
1165 | return (UVAL(b, 1) << 8) + UVAL(b, 0); | |
9361f839 WD |
1166 | } |
1167 | ||
b7922338 | 1168 | int32 read_int(int f) |
720b47f2 | 1169 | { |
4c36ddbe | 1170 | char b[4]; |
d8aeda1e | 1171 | int32 num; |
d730b113 | 1172 | |
482f48cc WD |
1173 | readfd(f, b, 4); |
1174 | num = IVAL(b, 0); | |
1175 | #if SIZEOF_INT32 > 4 | |
1176 | if (num & (int32)0x80000000) | |
1177 | num |= ~(int32)0xffffffff; | |
1178 | #endif | |
d8aeda1e | 1179 | return num; |
720b47f2 AT |
1180 | } |
1181 | ||
351e23ad | 1182 | int32 read_varint(int f) |
3a6a366f | 1183 | { |
351e23ad WD |
1184 | union { |
1185 | char b[5]; | |
1186 | int32 x; | |
1187 | } u; | |
1188 | uchar ch; | |
1189 | int extra; | |
1190 | ||
1191 | u.x = 0; | |
1192 | readfd(f, (char*)&ch, 1); | |
1193 | extra = int_byte_extra[ch / 4]; | |
1194 | if (extra) { | |
1195 | uchar bit = ((uchar)1<<(8-extra)); | |
1196 | if (extra >= (int)sizeof u.b) { | |
1197 | rprintf(FERROR, "Overflow in read_varint()\n"); | |
1198 | exit_cleanup(RERR_STREAMIO); | |
1199 | } | |
1200 | readfd(f, u.b, extra); | |
1201 | u.b[extra] = ch & (bit-1); | |
1202 | } else | |
1203 | u.b[0] = ch; | |
1204 | #if CAREFUL_ALIGNMENT | |
1205 | u.x = IVAL(u.b,0); | |
1206 | #endif | |
1207 | #if SIZEOF_INT32 > 4 | |
1208 | if (u.x & (int32)0x80000000) | |
1209 | u.x |= ~(int32)0xffffffff; | |
1210 | #endif | |
1211 | return u.x; | |
1212 | } | |
71c46176 | 1213 | |
351e23ad WD |
1214 | int64 read_varlong(int f, uchar min_bytes) |
1215 | { | |
1216 | union { | |
1217 | char b[9]; | |
1218 | int64 x; | |
1219 | } u; | |
1220 | char b2[8]; | |
1221 | int extra; | |
71c46176 | 1222 | |
031fa9ad | 1223 | #if SIZEOF_INT64 < 8 |
351e23ad | 1224 | memset(u.b, 0, 8); |
031fa9ad | 1225 | #else |
351e23ad | 1226 | u.x = 0; |
031fa9ad | 1227 | #endif |
351e23ad WD |
1228 | readfd(f, b2, min_bytes); |
1229 | memcpy(u.b, b2+1, min_bytes-1); | |
1230 | extra = int_byte_extra[CVAL(b2, 0) / 4]; | |
1231 | if (extra) { | |
1232 | uchar bit = ((uchar)1<<(8-extra)); | |
1233 | if (min_bytes + extra > (int)sizeof u.b) { | |
1234 | rprintf(FERROR, "Overflow in read_varlong()\n"); | |
1235 | exit_cleanup(RERR_STREAMIO); | |
1236 | } | |
1237 | readfd(f, u.b + min_bytes - 1, extra); | |
1238 | u.b[min_bytes + extra - 1] = CVAL(b2, 0) & (bit-1); | |
4ea4acf1 | 1239 | #if SIZEOF_INT64 < 8 |
351e23ad | 1240 | if (min_bytes + extra > 5 || u.b[4] || CVAL(u.b,3) & 0x80) { |
4ea4acf1 WD |
1241 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
1242 | exit_cleanup(RERR_UNSUPPORTED); | |
1243 | } | |
1244 | #endif | |
351e23ad WD |
1245 | } else |
1246 | u.b[min_bytes + extra - 1] = CVAL(b2, 0); | |
1247 | #if SIZEOF_INT64 < 8 | |
1248 | u.x = IVAL(u.b,0); | |
1249 | #elif CAREFUL_ALIGNMENT | |
1250 | u.x = IVAL(u.b,0) | (((int64)IVAL(u.b,4))<<32); | |
1251 | #endif | |
1252 | return u.x; | |
1253 | } | |
1254 | ||
1255 | int64 read_longint(int f) | |
1256 | { | |
4ea4acf1 | 1257 | #if SIZEOF_INT64 >= 8 |
351e23ad | 1258 | char b[9]; |
4ea4acf1 | 1259 | #endif |
351e23ad | 1260 | int32 num = read_int(f); |
71c46176 | 1261 | |
351e23ad WD |
1262 | if (num != (int32)0xffffffff) |
1263 | return num; | |
1264 | ||
1265 | #if SIZEOF_INT64 < 8 | |
1266 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1267 | exit_cleanup(RERR_UNSUPPORTED); | |
1268 | #else | |
1269 | readfd(f, b, 8); | |
1270 | return IVAL(b,0) | (((int64)IVAL(b,4))<<32); | |
1271 | #endif | |
3a6a366f AT |
1272 | } |
1273 | ||
4a19c3b2 | 1274 | void read_buf(int f, char *buf, size_t len) |
720b47f2 | 1275 | { |
4c36ddbe | 1276 | readfd(f,buf,len); |
720b47f2 AT |
1277 | } |
1278 | ||
4a19c3b2 | 1279 | void read_sbuf(int f, char *buf, size_t len) |
575f2fca | 1280 | { |
93095cbe | 1281 | readfd(f, buf, len); |
af436313 | 1282 | buf[len] = '\0'; |
575f2fca AT |
1283 | } |
1284 | ||
9361f839 | 1285 | uchar read_byte(int f) |
182dca5c | 1286 | { |
9361f839 | 1287 | uchar c; |
93095cbe | 1288 | readfd(f, (char *)&c, 1); |
4c36ddbe | 1289 | return c; |
182dca5c | 1290 | } |
720b47f2 | 1291 | |
46e99b09 WD |
1292 | int read_vstring(int f, char *buf, int bufsize) |
1293 | { | |
1294 | int len = read_byte(f); | |
1295 | ||
1296 | if (len & 0x80) | |
1297 | len = (len & ~0x80) * 0x100 + read_byte(f); | |
1298 | ||
1299 | if (len >= bufsize) { | |
1300 | rprintf(FERROR, "over-long vstring received (%d > %d)\n", | |
1301 | len, bufsize - 1); | |
9a6ed83f | 1302 | return -1; |
46e99b09 WD |
1303 | } |
1304 | ||
1305 | if (len) | |
1306 | readfd(f, buf, len); | |
1307 | buf[len] = '\0'; | |
1308 | return len; | |
1309 | } | |
1310 | ||
188fed95 WD |
1311 | /* Populate a sum_struct with values from the socket. This is |
1312 | * called by both the sender and the receiver. */ | |
1313 | void read_sum_head(int f, struct sum_struct *sum) | |
1314 | { | |
1315 | sum->count = read_int(f); | |
c638caa6 WD |
1316 | if (sum->count < 0) { |
1317 | rprintf(FERROR, "Invalid checksum count %ld [%s]\n", | |
1318 | (long)sum->count, who_am_i()); | |
1319 | exit_cleanup(RERR_PROTOCOL); | |
1320 | } | |
188fed95 WD |
1321 | sum->blength = read_int(f); |
1322 | if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { | |
cdf236aa WD |
1323 | rprintf(FERROR, "Invalid block length %ld [%s]\n", |
1324 | (long)sum->blength, who_am_i()); | |
188fed95 WD |
1325 | exit_cleanup(RERR_PROTOCOL); |
1326 | } | |
1327 | sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); | |
a0456b9c | 1328 | if (sum->s2length < 0 || sum->s2length > MAX_DIGEST_LEN) { |
cdf236aa WD |
1329 | rprintf(FERROR, "Invalid checksum length %d [%s]\n", |
1330 | sum->s2length, who_am_i()); | |
188fed95 WD |
1331 | exit_cleanup(RERR_PROTOCOL); |
1332 | } | |
1333 | sum->remainder = read_int(f); | |
1334 | if (sum->remainder < 0 || sum->remainder > sum->blength) { | |
cdf236aa WD |
1335 | rprintf(FERROR, "Invalid remainder length %ld [%s]\n", |
1336 | (long)sum->remainder, who_am_i()); | |
188fed95 WD |
1337 | exit_cleanup(RERR_PROTOCOL); |
1338 | } | |
1339 | } | |
1340 | ||
c207d7ec WD |
1341 | /* Send the values from a sum_struct over the socket. Set sum to |
1342 | * NULL if there are no checksums to send. This is called by both | |
1343 | * the generator and the sender. */ | |
1344 | void write_sum_head(int f, struct sum_struct *sum) | |
1345 | { | |
1346 | static struct sum_struct null_sum; | |
1347 | ||
1348 | if (sum == NULL) | |
1349 | sum = &null_sum; | |
1350 | ||
1351 | write_int(f, sum->count); | |
1352 | write_int(f, sum->blength); | |
1353 | if (protocol_version >= 27) | |
1354 | write_int(f, sum->s2length); | |
1355 | write_int(f, sum->remainder); | |
1356 | } | |
1357 | ||
08571358 MP |
1358 | /** |
1359 | * Sleep after writing to limit I/O bandwidth usage. | |
1360 | * | |
1361 | * @todo Rather than sleeping after each write, it might be better to | |
1362 | * use some kind of averaging. The current algorithm seems to always | |
1363 | * use a bit less bandwidth than specified, because it doesn't make up | |
1364 | * for slow periods. But arguably this is a feature. In addition, we | |
1365 | * ought to take the time used to write the data into account. | |
71e58630 WD |
1366 | * |
1367 | * During some phases of big transfers (file FOO is uptodate) this is | |
1368 | * called with a small bytes_written every time. As the kernel has to | |
1369 | * round small waits up to guarantee that we actually wait at least the | |
1370 | * requested number of microseconds, this can become grossly inaccurate. | |
1371 | * We therefore keep track of the bytes we've written over time and only | |
1372 | * sleep when the accumulated delay is at least 1 tenth of a second. | |
08571358 MP |
1373 | **/ |
1374 | static void sleep_for_bwlimit(int bytes_written) | |
1375 | { | |
71e58630 | 1376 | static struct timeval prior_tv; |
0f78b815 | 1377 | static long total_written = 0; |
71e58630 WD |
1378 | struct timeval tv, start_tv; |
1379 | long elapsed_usec, sleep_usec; | |
1380 | ||
1381 | #define ONE_SEC 1000000L /* # of microseconds in a second */ | |
08571358 | 1382 | |
9a0cfff5 | 1383 | if (!bwlimit_writemax) |
08571358 | 1384 | return; |
e681e820 | 1385 | |
0f78b815 | 1386 | total_written += bytes_written; |
71e58630 WD |
1387 | |
1388 | gettimeofday(&start_tv, NULL); | |
1389 | if (prior_tv.tv_sec) { | |
1390 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC | |
1391 | + (start_tv.tv_usec - prior_tv.tv_usec); | |
1392 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); | |
1393 | if (total_written < 0) | |
1394 | total_written = 0; | |
1395 | } | |
3151cbae | 1396 | |
71e58630 WD |
1397 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
1398 | if (sleep_usec < ONE_SEC / 10) { | |
1399 | prior_tv = start_tv; | |
1400 | return; | |
1401 | } | |
08571358 | 1402 | |
71e58630 WD |
1403 | tv.tv_sec = sleep_usec / ONE_SEC; |
1404 | tv.tv_usec = sleep_usec % ONE_SEC; | |
98b332ed | 1405 | select(0, NULL, NULL, NULL, &tv); |
71e58630 WD |
1406 | |
1407 | gettimeofday(&prior_tv, NULL); | |
1408 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC | |
1409 | + (prior_tv.tv_usec - start_tv.tv_usec); | |
1410 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); | |
08571358 MP |
1411 | } |
1412 | ||
1f75bb10 | 1413 | /* Write len bytes to the file descriptor fd, looping as necessary to get |
0fb2fc4a | 1414 | * the job done and also (in certain circumstances) reading any data on |
af436313 | 1415 | * msg_fd_in to avoid deadlock. |
880da007 MP |
1416 | * |
1417 | * This function underlies the multiplexing system. The body of the | |
1f75bb10 | 1418 | * application never calls this function directly. */ |
4a19c3b2 | 1419 | static void writefd_unbuffered(int fd, const char *buf, size_t len) |
720b47f2 | 1420 | { |
1ea087a7 | 1421 | size_t n, total = 0; |
6c850772 | 1422 | fd_set w_fds, r_fds, e_fds; |
d8aeda1e | 1423 | int maxfd, count, cnt, using_r_fds; |
e4c877cf | 1424 | int defer_inc = 0; |
8d9dc9f9 | 1425 | struct timeval tv; |
720b47f2 | 1426 | |
3be97bf9 | 1427 | if (no_flush++) |
e4c877cf | 1428 | defer_forwarding_messages++, defer_inc++; |
e44f9a12 | 1429 | |
4c36ddbe | 1430 | while (total < len) { |
8d9dc9f9 | 1431 | FD_ZERO(&w_fds); |
6c850772 WD |
1432 | FD_SET(fd, &w_fds); |
1433 | FD_ZERO(&e_fds); | |
1434 | FD_SET(fd, &e_fds); | |
1ea087a7 | 1435 | maxfd = fd; |
4c36ddbe | 1436 | |
954bbed8 | 1437 | if (msg_fd_in >= 0) { |
56014c8c | 1438 | FD_ZERO(&r_fds); |
6c850772 | 1439 | FD_SET(msg_fd_in, &r_fds); |
1ea087a7 WD |
1440 | if (msg_fd_in > maxfd) |
1441 | maxfd = msg_fd_in; | |
3eeac9bc WD |
1442 | using_r_fds = 1; |
1443 | } else | |
1444 | using_r_fds = 0; | |
8d9dc9f9 | 1445 | |
e626b29e | 1446 | tv.tv_sec = select_timeout; |
8d9dc9f9 | 1447 | tv.tv_usec = 0; |
4c36ddbe | 1448 | |
554e0a8d | 1449 | errno = 0; |
3eeac9bc | 1450 | count = select(maxfd + 1, using_r_fds ? &r_fds : NULL, |
6c850772 | 1451 | &w_fds, &e_fds, &tv); |
4c36ddbe AT |
1452 | |
1453 | if (count <= 0) { | |
1ea087a7 | 1454 | if (count < 0 && errno == EBADF) |
554e0a8d | 1455 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 1456 | check_timeout(); |
8d9dc9f9 AT |
1457 | continue; |
1458 | } | |
4c36ddbe | 1459 | |
35c8fd76 WD |
1460 | /*if (FD_ISSET(fd, &e_fds)) |
1461 | rprintf(FINFO, "select exception on fd %d\n", fd); */ | |
6c850772 | 1462 | |
3eeac9bc | 1463 | if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds)) |
d17e1dd2 | 1464 | read_msg_fd(); |
554e0a8d | 1465 | |
9a6ed83f | 1466 | if (!FD_ISSET(fd, &w_fds)) |
1ea087a7 | 1467 | continue; |
4c36ddbe | 1468 | |
1ea087a7 | 1469 | n = len - total; |
9a0cfff5 | 1470 | if (bwlimit_writemax && n > bwlimit_writemax) |
1ea087a7 | 1471 | n = bwlimit_writemax; |
d8aeda1e | 1472 | cnt = write(fd, buf + total, n); |
1ea087a7 | 1473 | |
d8aeda1e WD |
1474 | if (cnt <= 0) { |
1475 | if (cnt < 0) { | |
3309507d WD |
1476 | if (errno == EINTR) |
1477 | continue; | |
1478 | if (errno == EWOULDBLOCK || errno == EAGAIN) { | |
1479 | msleep(1); | |
1480 | continue; | |
1481 | } | |
f0359dd0 AT |
1482 | } |
1483 | ||
1ea087a7 | 1484 | /* Don't try to write errors back across the stream. */ |
1f75bb10 | 1485 | if (fd == sock_f_out) |
8ef246e0 | 1486 | io_end_multiplex_out(); |
2a5df862 WD |
1487 | /* Don't try to write errors down a failing msg pipe. */ |
1488 | if (am_server && fd == msg_fd_out) | |
1489 | exit_cleanup(RERR_STREAMIO); | |
1ea087a7 | 1490 | rsyserr(FERROR, errno, |
b88c2e8f WD |
1491 | "writefd_unbuffered failed to write %ld bytes [%s]", |
1492 | (long)len, who_am_i()); | |
d1b31da7 WD |
1493 | /* If the other side is sending us error messages, try |
1494 | * to grab any messages they sent before they died. */ | |
f2179fd3 | 1495 | while (!am_server && fd == sock_f_out && io_multiplexing_in) { |
ba525f77 | 1496 | char buf[1024]; |
3b0a30eb | 1497 | set_io_timeout(30); |
9e2409ab | 1498 | ignore_timeout = 0; |
ba525f77 | 1499 | readfd_unbuffered(sock_f_in, buf, sizeof buf); |
d1b31da7 | 1500 | } |
1ea087a7 WD |
1501 | exit_cleanup(RERR_STREAMIO); |
1502 | } | |
4c36ddbe | 1503 | |
d8aeda1e | 1504 | total += cnt; |
e4c877cf | 1505 | defer_forwarding_messages++, defer_inc++; |
a800434a | 1506 | |
1f75bb10 | 1507 | if (fd == sock_f_out) { |
626bec8e | 1508 | if (io_timeout || am_generator) |
3b0a30eb | 1509 | last_io_out = time(NULL); |
d8aeda1e | 1510 | sleep_for_bwlimit(cnt); |
1f75bb10 | 1511 | } |
4c36ddbe | 1512 | } |
e44f9a12 AT |
1513 | |
1514 | no_flush--; | |
e4c877cf WD |
1515 | if (!(defer_forwarding_messages -= defer_inc)) |
1516 | msg_flush(); | |
d6dead6b AT |
1517 | } |
1518 | ||
dde5b772 | 1519 | void io_flush(int flush_it_all) |
d6dead6b | 1520 | { |
1f75bb10 | 1521 | if (!iobuf_out_cnt || no_flush) |
d17e1dd2 | 1522 | return; |
8d9dc9f9 | 1523 | |
d17e1dd2 | 1524 | if (io_multiplexing_out) |
332cf6df | 1525 | mplex_write(sock_f_out, MSG_DATA, iobuf_out, iobuf_out_cnt, 0); |
d17e1dd2 | 1526 | else |
8ef246e0 | 1527 | writefd_unbuffered(iobuf_f_out, iobuf_out, iobuf_out_cnt); |
1f75bb10 | 1528 | iobuf_out_cnt = 0; |
e4c877cf WD |
1529 | |
1530 | if (flush_it_all && !defer_forwarding_messages) | |
1531 | msg_flush(); | |
8d9dc9f9 AT |
1532 | } |
1533 | ||
4a19c3b2 | 1534 | static void writefd(int fd, const char *buf, size_t len) |
d6dead6b | 1535 | { |
1f75bb10 WD |
1536 | if (fd == sock_f_out) |
1537 | stats.total_written += len; | |
1538 | ||
b9f592fb WD |
1539 | if (fd == write_batch_monitor_out) { |
1540 | if ((size_t)write(batch_fd, buf, len) != len) | |
1541 | exit_cleanup(RERR_FILEIO); | |
1542 | } | |
1543 | ||
8ef246e0 | 1544 | if (!iobuf_out || fd != iobuf_f_out) { |
4c36ddbe AT |
1545 | writefd_unbuffered(fd, buf, len); |
1546 | return; | |
1547 | } | |
d6dead6b AT |
1548 | |
1549 | while (len) { | |
1f75bb10 | 1550 | int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt); |
d6dead6b | 1551 | if (n > 0) { |
1f75bb10 | 1552 | memcpy(iobuf_out+iobuf_out_cnt, buf, n); |
d6dead6b AT |
1553 | buf += n; |
1554 | len -= n; | |
1f75bb10 | 1555 | iobuf_out_cnt += n; |
d6dead6b | 1556 | } |
3151cbae | 1557 | |
1f75bb10 | 1558 | if (iobuf_out_cnt == IO_BUFFER_SIZE) |
d17e1dd2 | 1559 | io_flush(NORMAL_FLUSH); |
d6dead6b | 1560 | } |
d6dead6b | 1561 | } |
720b47f2 | 1562 | |
3a993aa4 | 1563 | void write_shortint(int f, unsigned short x) |
9361f839 | 1564 | { |
3a993aa4 WD |
1565 | char b[2]; |
1566 | b[0] = (char)x; | |
1567 | b[1] = (char)(x >> 8); | |
1568 | writefd(f, b, 2); | |
9361f839 WD |
1569 | } |
1570 | ||
351e23ad WD |
1571 | void write_int(int f, int32 x) |
1572 | { | |
1573 | char b[4]; | |
1574 | SIVAL(b, 0, x); | |
1575 | writefd(f, b, 4); | |
1576 | } | |
1577 | ||
f31514ad | 1578 | void write_varint(int f, int32 x) |
1c3344a1 WD |
1579 | { |
1580 | char b[5]; | |
351e23ad WD |
1581 | uchar bit; |
1582 | int cnt = 4; | |
1583 | ||
1584 | SIVAL(b, 1, x); | |
1585 | ||
1586 | while (cnt > 1 && b[cnt] == 0) | |
1587 | cnt--; | |
1588 | bit = ((uchar)1<<(7-cnt+1)); | |
1589 | if (CVAL(b, cnt) >= bit) { | |
1590 | cnt++; | |
1591 | *b = ~(bit-1); | |
1592 | } else if (cnt > 1) | |
1593 | *b = b[cnt] | ~(bit*2-1); | |
1594 | else | |
1595 | *b = b[cnt]; | |
1596 | ||
1597 | writefd(f, b, cnt); | |
1c3344a1 WD |
1598 | } |
1599 | ||
351e23ad | 1600 | void write_varlong(int f, int64 x, uchar min_bytes) |
720b47f2 | 1601 | { |
351e23ad WD |
1602 | char b[9]; |
1603 | uchar bit; | |
1604 | int cnt = 8; | |
1605 | ||
1606 | SIVAL(b, 1, x); | |
1607 | #if SIZEOF_INT64 >= 8 | |
1608 | SIVAL(b, 5, x >> 32); | |
1609 | #else | |
1610 | if (x <= 0x7FFFFFFF && x >= 0) | |
1611 | memset(b + 5, 0, 4); | |
1612 | else { | |
1613 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1614 | exit_cleanup(RERR_UNSUPPORTED); | |
1615 | } | |
1616 | #endif | |
1617 | ||
1618 | while (cnt > min_bytes && b[cnt] == 0) | |
1619 | cnt--; | |
1620 | bit = ((uchar)1<<(7-cnt+min_bytes)); | |
1621 | if (CVAL(b, cnt) >= bit) { | |
1622 | cnt++; | |
1623 | *b = ~(bit-1); | |
1624 | } else if (cnt > min_bytes) | |
1625 | *b = b[cnt] | ~(bit*2-1); | |
1626 | else | |
1627 | *b = b[cnt]; | |
1628 | ||
1629 | writefd(f, b, cnt); | |
720b47f2 AT |
1630 | } |
1631 | ||
7a24c346 MP |
1632 | /* |
1633 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any | |
1634 | * 64-bit types on this platform. | |
1635 | */ | |
71c46176 | 1636 | void write_longint(int f, int64 x) |
3a6a366f | 1637 | { |
351e23ad | 1638 | char b[12], * const s = b+4; |
3a6a366f | 1639 | |
351e23ad WD |
1640 | SIVAL(s, 0, x); |
1641 | if (x <= 0x7FFFFFFF && x >= 0) { | |
482f48cc | 1642 | writefd(f, s, 4); |
351e23ad WD |
1643 | return; |
1644 | } | |
3a6a366f | 1645 | |
4ea4acf1 | 1646 | #if SIZEOF_INT64 < 8 |
351e23ad WD |
1647 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
1648 | exit_cleanup(RERR_UNSUPPORTED); | |
4ea4acf1 | 1649 | #else |
351e23ad WD |
1650 | memset(b, 0xFF, 4); |
1651 | SIVAL(s, 4, x >> 32); | |
1652 | writefd(f, b, 12); | |
4ea4acf1 | 1653 | #endif |
3a6a366f AT |
1654 | } |
1655 | ||
4a19c3b2 | 1656 | void write_buf(int f, const char *buf, size_t len) |
720b47f2 | 1657 | { |
4c36ddbe | 1658 | writefd(f,buf,len); |
720b47f2 AT |
1659 | } |
1660 | ||
880da007 | 1661 | /** Write a string to the connection */ |
4a19c3b2 | 1662 | void write_sbuf(int f, const char *buf) |
f0fca04e | 1663 | { |
93095cbe | 1664 | writefd(f, buf, strlen(buf)); |
f0fca04e AT |
1665 | } |
1666 | ||
9361f839 | 1667 | void write_byte(int f, uchar c) |
182dca5c | 1668 | { |
93095cbe | 1669 | writefd(f, (char *)&c, 1); |
182dca5c AT |
1670 | } |
1671 | ||
4a19c3b2 | 1672 | void write_vstring(int f, const char *str, int len) |
46e99b09 WD |
1673 | { |
1674 | uchar lenbuf[3], *lb = lenbuf; | |
1675 | ||
1676 | if (len > 0x7F) { | |
1677 | if (len > 0x7FFF) { | |
1678 | rprintf(FERROR, | |
1679 | "attempting to send over-long vstring (%d > %d)\n", | |
1680 | len, 0x7FFF); | |
1681 | exit_cleanup(RERR_PROTOCOL); | |
1682 | } | |
1683 | *lb++ = len / 0x100 + 0x80; | |
1684 | } | |
1685 | *lb = len; | |
1686 | ||
1687 | writefd(f, (char*)lenbuf, lb - lenbuf + 1); | |
1688 | if (len) | |
1689 | writefd(f, str, len); | |
1690 | } | |
1691 | ||
8a65e0ce WD |
1692 | /* Send a file-list index using a byte-reduction method. */ |
1693 | void write_ndx(int f, int32 ndx) | |
1694 | { | |
1695 | static int32 prev_positive = -1, prev_negative = 1; | |
1696 | int32 diff, cnt = 0; | |
1697 | char b[6]; | |
1698 | ||
1699 | if (protocol_version < 30 || read_batch) { | |
1700 | write_int(f, ndx); | |
1701 | return; | |
1702 | } | |
1703 | ||
1704 | /* Send NDX_DONE as a single-byte 0 with no side effects. Send | |
1705 | * negative nums as a positive after sending a leading 0xFF. */ | |
1706 | if (ndx >= 0) { | |
1707 | diff = ndx - prev_positive; | |
1708 | prev_positive = ndx; | |
1709 | } else if (ndx == NDX_DONE) { | |
1710 | *b = 0; | |
1711 | writefd(f, b, 1); | |
1712 | return; | |
1713 | } else { | |
1714 | b[cnt++] = (char)0xFF; | |
1715 | ndx = -ndx; | |
1716 | diff = ndx - prev_negative; | |
1717 | prev_negative = ndx; | |
1718 | } | |
1719 | ||
1720 | /* A diff of 1 - 253 is sent as a one-byte diff; a diff of 254 - 32767 | |
1721 | * or 0 is sent as a 0xFE + a two-byte diff; otherwise we send 0xFE | |
1722 | * & all 4 bytes of the (non-negative) num with the high-bit set. */ | |
1723 | if (diff < 0xFE && diff > 0) | |
1724 | b[cnt++] = (char)diff; | |
1725 | else if (diff < 0 || diff > 0x7FFF) { | |
1726 | b[cnt++] = (char)0xFE; | |
1727 | b[cnt++] = (char)((ndx >> 24) | 0x80); | |
8a65e0ce | 1728 | b[cnt++] = (char)ndx; |
351e23ad WD |
1729 | b[cnt++] = (char)(ndx >> 8); |
1730 | b[cnt++] = (char)(ndx >> 16); | |
8a65e0ce WD |
1731 | } else { |
1732 | b[cnt++] = (char)0xFE; | |
1733 | b[cnt++] = (char)(diff >> 8); | |
1734 | b[cnt++] = (char)diff; | |
1735 | } | |
1736 | writefd(f, b, cnt); | |
1737 | } | |
1738 | ||
1739 | /* Receive a file-list index using a byte-reduction method. */ | |
1740 | int32 read_ndx(int f) | |
1741 | { | |
1742 | static int32 prev_positive = -1, prev_negative = 1; | |
1743 | int32 *prev_ptr, num; | |
1744 | char b[4]; | |
1745 | ||
1746 | if (protocol_version < 30) | |
1747 | return read_int(f); | |
1748 | ||
1749 | readfd(f, b, 1); | |
1750 | if (CVAL(b, 0) == 0xFF) { | |
1751 | readfd(f, b, 1); | |
1752 | prev_ptr = &prev_negative; | |
1753 | } else if (CVAL(b, 0) == 0) | |
1754 | return NDX_DONE; | |
1755 | else | |
1756 | prev_ptr = &prev_positive; | |
1757 | if (CVAL(b, 0) == 0xFE) { | |
1758 | readfd(f, b, 2); | |
1759 | if (CVAL(b, 0) & 0x80) { | |
351e23ad WD |
1760 | b[3] = CVAL(b, 0) & ~0x80; |
1761 | b[0] = b[1]; | |
1762 | readfd(f, b+1, 2); | |
1763 | num = IVAL(b, 0); | |
8a65e0ce | 1764 | } else |
351e23ad | 1765 | num = (UVAL(b,0)<<8) + UVAL(b,1) + *prev_ptr; |
8a65e0ce | 1766 | } else |
351e23ad | 1767 | num = UVAL(b, 0) + *prev_ptr; |
8a65e0ce WD |
1768 | *prev_ptr = num; |
1769 | if (prev_ptr == &prev_negative) | |
1770 | num = -num; | |
1771 | return num; | |
1772 | } | |
1773 | ||
67b8f3df WD |
1774 | /* Read a line of up to bufsiz-1 characters into buf. Strips |
1775 | * the (required) trailing newline and all carriage returns. | |
1776 | * Returns 1 for success; 0 for I/O error or truncation. */ | |
1777 | int read_line_old(int f, char *buf, size_t bufsiz) | |
f0fca04e | 1778 | { |
67b8f3df WD |
1779 | bufsiz--; /* leave room for the null */ |
1780 | while (bufsiz > 0) { | |
528bfcd7 | 1781 | buf[0] = 0; |
f0fca04e | 1782 | read_buf(f, buf, 1); |
914cc65c MP |
1783 | if (buf[0] == 0) |
1784 | return 0; | |
6ed6d7f5 | 1785 | if (buf[0] == '\n') |
f0fca04e | 1786 | break; |
f0fca04e AT |
1787 | if (buf[0] != '\r') { |
1788 | buf++; | |
67b8f3df | 1789 | bufsiz--; |
f0fca04e AT |
1790 | } |
1791 | } | |
6ed6d7f5 | 1792 | *buf = '\0'; |
67b8f3df | 1793 | return bufsiz > 0; |
f0fca04e AT |
1794 | } |
1795 | ||
f0fca04e AT |
1796 | void io_printf(int fd, const char *format, ...) |
1797 | { | |
d62bcc17 | 1798 | va_list ap; |
33544bf4 | 1799 | char buf[BIGPATHBUFLEN]; |
f0fca04e | 1800 | int len; |
3151cbae | 1801 | |
f0fca04e | 1802 | va_start(ap, format); |
3151cbae | 1803 | len = vsnprintf(buf, sizeof buf, format, ap); |
f0fca04e AT |
1804 | va_end(ap); |
1805 | ||
f89b9368 WD |
1806 | if (len < 0) |
1807 | exit_cleanup(RERR_STREAMIO); | |
f0fca04e | 1808 | |
33544bf4 WD |
1809 | if (len > (int)sizeof buf) { |
1810 | rprintf(FERROR, "io_printf() was too long for the buffer.\n"); | |
1811 | exit_cleanup(RERR_STREAMIO); | |
1812 | } | |
1813 | ||
f0fca04e AT |
1814 | write_sbuf(fd, buf); |
1815 | } | |
8d9dc9f9 | 1816 | |
d17e1dd2 | 1817 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1818 | void io_start_multiplex_out(void) |
8d9dc9f9 | 1819 | { |
d17e1dd2 | 1820 | io_flush(NORMAL_FLUSH); |
8ef246e0 | 1821 | io_start_buffering_out(sock_f_out); |
8d9dc9f9 AT |
1822 | io_multiplexing_out = 1; |
1823 | } | |
1824 | ||
d17e1dd2 | 1825 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1826 | void io_start_multiplex_in(void) |
8d9dc9f9 | 1827 | { |
d17e1dd2 | 1828 | io_flush(NORMAL_FLUSH); |
8ef246e0 | 1829 | io_start_buffering_in(sock_f_in); |
8d9dc9f9 AT |
1830 | io_multiplexing_in = 1; |
1831 | } | |
1832 | ||
d17e1dd2 | 1833 | /** Write an message to the multiplexed data stream. */ |
332cf6df | 1834 | int io_multiplex_write(enum msgcode code, const char *buf, size_t len, int convert) |
8d9dc9f9 | 1835 | { |
f89b9368 WD |
1836 | if (!io_multiplexing_out) |
1837 | return 0; | |
d17e1dd2 | 1838 | io_flush(NORMAL_FLUSH); |
1b7c47cb | 1839 | stats.total_written += (len+4); |
332cf6df | 1840 | mplex_write(sock_f_out, code, buf, len, convert); |
8d9dc9f9 AT |
1841 | return 1; |
1842 | } | |
1843 | ||
8ef246e0 | 1844 | void io_end_multiplex_in(void) |
7f459268 WD |
1845 | { |
1846 | io_multiplexing_in = 0; | |
8ef246e0 | 1847 | io_end_buffering_in(); |
7f459268 WD |
1848 | } |
1849 | ||
d17e1dd2 | 1850 | /** Stop output multiplexing. */ |
8ef246e0 | 1851 | void io_end_multiplex_out(void) |
554e0a8d AT |
1852 | { |
1853 | io_multiplexing_out = 0; | |
8ef246e0 | 1854 | io_end_buffering_out(); |
554e0a8d AT |
1855 | } |
1856 | ||
b9f592fb WD |
1857 | void start_write_batch(int fd) |
1858 | { | |
1859 | /* Some communication has already taken place, but we don't | |
1860 | * enable batch writing until here so that we can write a | |
1861 | * canonical record of the communication even though the | |
1862 | * actual communication so far depends on whether a daemon | |
1863 | * is involved. */ | |
1864 | write_int(batch_fd, protocol_version); | |
71456d30 WD |
1865 | if (protocol_version >= 30) |
1866 | write_byte(batch_fd, inc_recurse); | |
b9f592fb | 1867 | write_int(batch_fd, checksum_seed); |
b9f592fb WD |
1868 | |
1869 | if (am_sender) | |
1870 | write_batch_monitor_out = fd; | |
1871 | else | |
1872 | write_batch_monitor_in = fd; | |
1873 | } | |
1874 | ||
1875 | void stop_write_batch(void) | |
1876 | { | |
1877 | write_batch_monitor_out = -1; | |
1878 | write_batch_monitor_in = -1; | |
1879 | } |