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 |
17a4977b | 103 | static int defer_forwarding_messages = 0, defer_forwarding_keep = 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; |
17a4977b | 443 | if (!--defer_forwarding_messages && !no_flush) |
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 | ||
17a4977b | 483 | defer_forwarding_keep = 1; /* defer_forwarding_messages++ on return */ |
3be97bf9 | 484 | writefd_unbuffered(fd, buffer, n+4); |
17a4977b | 485 | defer_forwarding_keep = 0; |
3be97bf9 WD |
486 | |
487 | len -= n; | |
488 | buf += n; | |
489 | ||
332cf6df WD |
490 | #ifdef ICONV_OPTION |
491 | if (convert) { | |
ba525f77 WD |
492 | xbuf outbuf, inbuf; |
493 | ||
494 | INIT_CONST_XBUF(outbuf, buffer); | |
495 | INIT_XBUF(inbuf, (char*)buf, len, -1); | |
496 | ||
ba525f77 WD |
497 | do { |
498 | iconvbufs(ic_send, &inbuf, &outbuf, | |
499 | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE); | |
500 | writefd_unbuffered(fd, outbuf.buf, outbuf.len); | |
501 | } while (inbuf.len); | |
332cf6df WD |
502 | } else |
503 | #endif | |
17a4977b | 504 | if (len) |
3be97bf9 | 505 | writefd_unbuffered(fd, buf, len); |
17a4977b WD |
506 | |
507 | if (!--defer_forwarding_messages && !no_flush) | |
508 | msg_flush(); | |
d17e1dd2 WD |
509 | } |
510 | ||
332cf6df | 511 | int send_msg(enum msgcode code, const char *buf, int len, int convert) |
37f35d89 WD |
512 | { |
513 | if (msg_fd_out < 0) { | |
12ccc73a | 514 | if (!defer_forwarding_messages) |
332cf6df | 515 | return io_multiplex_write(code, buf, len, convert); |
12ccc73a WD |
516 | if (!io_multiplexing_out) |
517 | return 0; | |
332cf6df | 518 | msg_list_add(&msg_queue, code, buf, len, convert); |
12ccc73a | 519 | return 1; |
37f35d89 | 520 | } |
e4c877cf | 521 | if (flist_forward_from >= 0) |
332cf6df | 522 | msg_list_add(&msg_queue, code, buf, len, convert); |
e4c877cf | 523 | else |
332cf6df | 524 | mplex_write(msg_fd_out, code, buf, len, convert); |
12ccc73a | 525 | return 1; |
37f35d89 WD |
526 | } |
527 | ||
155d9206 WD |
528 | void send_msg_int(enum msgcode code, int num) |
529 | { | |
530 | char numbuf[4]; | |
531 | SIVAL(numbuf, 0, num); | |
332cf6df | 532 | send_msg(code, numbuf, 4, 0); |
155d9206 WD |
533 | } |
534 | ||
8ef246e0 | 535 | void wait_for_receiver(void) |
d17e1dd2 | 536 | { |
2a5df862 WD |
537 | if (iobuf_out_cnt) |
538 | io_flush(NORMAL_FLUSH); | |
539 | else | |
540 | read_msg_fd(); | |
8ef246e0 | 541 | } |
554e0a8d | 542 | |
8ef246e0 WD |
543 | int get_redo_num(void) |
544 | { | |
c6816b94 | 545 | return flist_ndx_pop(&redo_list); |
554e0a8d AT |
546 | } |
547 | ||
cdf236aa WD |
548 | int get_hlink_num(void) |
549 | { | |
550 | return flist_ndx_pop(&hlink_list); | |
551 | } | |
552 | ||
56014c8c WD |
553 | /** |
554 | * When we're the receiver and we have a local --files-from list of names | |
555 | * that needs to be sent over the socket to the sender, we have to do two | |
556 | * things at the same time: send the sender a list of what files we're | |
557 | * processing and read the incoming file+info list from the sender. We do | |
558 | * this by augmenting the read_timeout() function to copy this data. It | |
ba525f77 WD |
559 | * uses ff_buf to read a block of data from f_in (when it is ready, since |
560 | * it might be a pipe) and then blast it out f_out (when it is ready to | |
561 | * receive more data). | |
56014c8c WD |
562 | */ |
563 | void io_set_filesfrom_fds(int f_in, int f_out) | |
564 | { | |
565 | io_filesfrom_f_in = f_in; | |
566 | io_filesfrom_f_out = f_out; | |
ba525f77 WD |
567 | alloc_xbuf(&ff_buf, 2048); |
568 | #ifdef ICONV_OPTION | |
569 | if (protect_args) | |
570 | alloc_xbuf(&iconv_buf, 1024); | |
571 | #endif | |
56014c8c | 572 | } |
720b47f2 | 573 | |
cb2e1f18 WD |
574 | /* It's almost always an error to get an EOF when we're trying to read from the |
575 | * network, because the protocol is (for the most part) self-terminating. | |
880da007 | 576 | * |
cb2e1f18 WD |
577 | * There is one case for the receiver when it is at the end of the transfer |
578 | * (hanging around reading any keep-alive packets that might come its way): if | |
579 | * the sender dies before the generator's kill-signal comes through, we can end | |
580 | * up here needing to loop until the kill-signal arrives. In this situation, | |
581 | * kluge_around_eof will be < 0. | |
582 | * | |
583 | * There is another case for older protocol versions (< 24) where the module | |
584 | * listing was not terminated, so we must ignore an EOF error in that case and | |
585 | * exit. In this situation, kluge_around_eof will be > 0. */ | |
1f75bb10 | 586 | static void whine_about_eof(int fd) |
7a55d06e | 587 | { |
574c2500 | 588 | if (kluge_around_eof && fd == sock_f_in) { |
55bb7fff | 589 | int i; |
574c2500 WD |
590 | if (kluge_around_eof > 0) |
591 | exit_cleanup(0); | |
55bb7fff WD |
592 | /* If we're still here after 10 seconds, exit with an error. */ |
593 | for (i = 10*1000/20; i--; ) | |
574c2500 WD |
594 | msleep(20); |
595 | } | |
3151cbae | 596 | |
00bdf899 | 597 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
dca68b0a WD |
598 | "(%.0f bytes received so far) [%s]\n", |
599 | (double)stats.total_read, who_am_i()); | |
00bdf899 WD |
600 | |
601 | exit_cleanup(RERR_STREAMIO); | |
7a55d06e | 602 | } |
720b47f2 | 603 | |
880da007 | 604 | /** |
6ed6d7f5 | 605 | * Read from a socket with I/O timeout. return the number of bytes |
c3563c46 MP |
606 | * read. If no bytes can be read then exit, never return a number <= 0. |
607 | * | |
8886f8d0 MP |
608 | * TODO: If the remote shell connection fails, then current versions |
609 | * actually report an "unexpected EOF" error here. Since it's a | |
610 | * fairly common mistake to try to use rsh when ssh is required, we | |
611 | * should trap that: if we fail to read any data at all, we should | |
612 | * give a better explanation. We can tell whether the connection has | |
613 | * started by looking e.g. at whether the remote version is known yet. | |
c3563c46 | 614 | */ |
3151cbae | 615 | static int read_timeout(int fd, char *buf, size_t len) |
8d9dc9f9 | 616 | { |
d8aeda1e | 617 | int n, cnt = 0; |
4c36ddbe | 618 | |
dde5b772 | 619 | io_flush(FULL_FLUSH); |
ea2111d1 | 620 | |
d8aeda1e | 621 | while (cnt == 0) { |
7a55d06e | 622 | /* until we manage to read *something* */ |
56014c8c | 623 | fd_set r_fds, w_fds; |
4c36ddbe | 624 | struct timeval tv; |
1ea087a7 | 625 | int maxfd = fd; |
a57873b7 | 626 | int count; |
4c36ddbe | 627 | |
56014c8c | 628 | FD_ZERO(&r_fds); |
a7026ba9 | 629 | FD_ZERO(&w_fds); |
56014c8c | 630 | FD_SET(fd, &r_fds); |
3309507d | 631 | if (io_filesfrom_f_out >= 0) { |
56014c8c | 632 | int new_fd; |
ba525f77 | 633 | if (ff_buf.len == 0) { |
3309507d | 634 | if (io_filesfrom_f_in >= 0) { |
56014c8c WD |
635 | FD_SET(io_filesfrom_f_in, &r_fds); |
636 | new_fd = io_filesfrom_f_in; | |
637 | } else { | |
638 | io_filesfrom_f_out = -1; | |
639 | new_fd = -1; | |
640 | } | |
641 | } else { | |
56014c8c WD |
642 | FD_SET(io_filesfrom_f_out, &w_fds); |
643 | new_fd = io_filesfrom_f_out; | |
644 | } | |
1ea087a7 WD |
645 | if (new_fd > maxfd) |
646 | maxfd = new_fd; | |
554e0a8d AT |
647 | } |
648 | ||
e626b29e | 649 | tv.tv_sec = select_timeout; |
4c36ddbe AT |
650 | tv.tv_usec = 0; |
651 | ||
554e0a8d AT |
652 | errno = 0; |
653 | ||
a7026ba9 | 654 | count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); |
a57873b7 | 655 | |
a57873b7 | 656 | if (count <= 0) { |
2a5df862 WD |
657 | if (errno == EBADF) { |
658 | defer_forwarding_messages = 0; | |
554e0a8d | 659 | exit_cleanup(RERR_SOCKETIO); |
2a5df862 | 660 | } |
bd717af8 | 661 | check_timeout(); |
4c36ddbe AT |
662 | continue; |
663 | } | |
664 | ||
3309507d | 665 | if (io_filesfrom_f_out >= 0) { |
ba525f77 | 666 | if (ff_buf.len) { |
56014c8c WD |
667 | if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { |
668 | int l = write(io_filesfrom_f_out, | |
ba525f77 WD |
669 | ff_buf.buf + ff_buf.pos, |
670 | ff_buf.len); | |
56014c8c | 671 | if (l > 0) { |
ba525f77 WD |
672 | if (!(ff_buf.len -= l)) |
673 | ff_buf.pos = 0; | |
56014c8c | 674 | else |
ba525f77 | 675 | ff_buf.pos += l; |
47cffb77 | 676 | } else if (errno != EINTR) { |
56014c8c WD |
677 | /* XXX should we complain? */ |
678 | io_filesfrom_f_out = -1; | |
679 | } | |
680 | } | |
3309507d | 681 | } else if (io_filesfrom_f_in >= 0) { |
56014c8c | 682 | if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { |
22955408 | 683 | #ifdef ICONV_OPTION |
ba525f77 | 684 | xbuf *ibuf = filesfrom_convert ? &iconv_buf : &ff_buf; |
22955408 WD |
685 | #else |
686 | xbuf *ibuf = &ff_buf; | |
687 | #endif | |
ba525f77 | 688 | int l = read(io_filesfrom_f_in, ibuf->buf, ibuf->size); |
56014c8c | 689 | if (l <= 0) { |
47cffb77 WD |
690 | if (l == 0 || errno != EINTR) { |
691 | /* Send end-of-file marker */ | |
ba525f77 WD |
692 | memcpy(ff_buf.buf, "\0\0", 2); |
693 | ff_buf.len = ff_lastchar? 2 : 1; | |
694 | ff_buf.pos = 0; | |
47cffb77 WD |
695 | io_filesfrom_f_in = -1; |
696 | } | |
56014c8c | 697 | } else { |
22955408 | 698 | #ifdef ICONV_OPTION |
ba525f77 WD |
699 | if (filesfrom_convert) { |
700 | iconv_buf.pos = 0; | |
701 | iconv_buf.len = l; | |
702 | iconvbufs(ic_send, &iconv_buf, &ff_buf, | |
703 | ICB_EXPAND_OUT|ICB_INCLUDE_BAD|ICB_INCLUDE_INCOMPLETE); | |
704 | l = ff_buf.len; | |
705 | } | |
22955408 | 706 | #endif |
56014c8c | 707 | if (!eol_nulls) { |
ba525f77 | 708 | char *s = ff_buf.buf + l; |
56014c8c | 709 | /* Transform CR and/or LF into '\0' */ |
ba525f77 | 710 | while (s-- > ff_buf.buf) { |
56014c8c WD |
711 | if (*s == '\n' || *s == '\r') |
712 | *s = '\0'; | |
713 | } | |
714 | } | |
ba525f77 | 715 | if (!ff_lastchar) { |
56014c8c WD |
716 | /* Last buf ended with a '\0', so don't |
717 | * let this buf start with one. */ | |
ba525f77 WD |
718 | while (l && ff_buf.buf[ff_buf.pos] == '\0') |
719 | ff_buf.pos++, l--; | |
56014c8c WD |
720 | } |
721 | if (!l) | |
ba525f77 | 722 | ff_buf.pos = 0; |
56014c8c | 723 | else { |
ba525f77 | 724 | char *f = ff_buf.buf + ff_buf.pos; |
56014c8c WD |
725 | char *t = f; |
726 | char *eob = f + l; | |
727 | /* Eliminate any multi-'\0' runs. */ | |
728 | while (f != eob) { | |
729 | if (!(*t++ = *f++)) { | |
730 | while (f != eob && !*f) | |
731 | f++, l--; | |
732 | } | |
733 | } | |
ba525f77 | 734 | ff_lastchar = f[-1]; |
56014c8c | 735 | } |
ba525f77 | 736 | ff_buf.len = l; |
56014c8c WD |
737 | } |
738 | } | |
739 | } | |
740 | } | |
741 | ||
f89b9368 WD |
742 | if (!FD_ISSET(fd, &r_fds)) |
743 | continue; | |
554e0a8d | 744 | |
4c36ddbe AT |
745 | n = read(fd, buf, len); |
746 | ||
1ea087a7 WD |
747 | if (n <= 0) { |
748 | if (n == 0) | |
1f75bb10 | 749 | whine_about_eof(fd); /* Doesn't return. */ |
d62bcc17 WD |
750 | if (errno == EINTR || errno == EWOULDBLOCK |
751 | || errno == EAGAIN) | |
7a55d06e | 752 | continue; |
1f75bb10 WD |
753 | |
754 | /* Don't write errors on a dead socket. */ | |
72f2d1b3 | 755 | if (fd == sock_f_in) { |
8ef246e0 | 756 | io_end_multiplex_out(); |
72f2d1b3 WD |
757 | rsyserr(FSOCKERR, errno, "read error"); |
758 | } else | |
759 | rsyserr(FERROR, errno, "read error"); | |
1f75bb10 | 760 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 761 | } |
00bdf899 WD |
762 | |
763 | buf += n; | |
764 | len -= n; | |
d8aeda1e | 765 | cnt += n; |
1f75bb10 | 766 | |
3b0a30eb WD |
767 | if (fd == sock_f_in && io_timeout) |
768 | last_io_in = time(NULL); | |
4c36ddbe | 769 | } |
8d9dc9f9 | 770 | |
d8aeda1e | 771 | return cnt; |
4c36ddbe | 772 | } |
8d9dc9f9 | 773 | |
67b8f3df | 774 | /* Read a line into the "buf" buffer. */ |
ba525f77 | 775 | int read_line(int fd, char *buf, size_t bufsiz, int flags) |
56014c8c | 776 | { |
ba525f77 | 777 | char ch, *s, *eob; |
56014c8c | 778 | int cnt; |
56014c8c | 779 | |
ba525f77 WD |
780 | #ifdef ICONV_OPTION |
781 | if (flags & RL_CONVERT && iconv_buf.size < bufsiz) | |
782 | realloc_xbuf(&iconv_buf, bufsiz + 1024); | |
783 | #endif | |
784 | ||
56014c8c | 785 | start: |
22955408 | 786 | #ifdef ICONV_OPTION |
ba525f77 | 787 | s = flags & RL_CONVERT ? iconv_buf.buf : buf; |
22955408 WD |
788 | #else |
789 | s = buf; | |
790 | #endif | |
ba525f77 | 791 | eob = s + bufsiz - 1; |
56014c8c WD |
792 | while (1) { |
793 | cnt = read(fd, &ch, 1); | |
794 | if (cnt < 0 && (errno == EWOULDBLOCK | |
795 | || errno == EINTR || errno == EAGAIN)) { | |
796 | struct timeval tv; | |
6c850772 WD |
797 | fd_set r_fds, e_fds; |
798 | FD_ZERO(&r_fds); | |
799 | FD_SET(fd, &r_fds); | |
800 | FD_ZERO(&e_fds); | |
801 | FD_SET(fd, &e_fds); | |
e626b29e | 802 | tv.tv_sec = select_timeout; |
56014c8c | 803 | tv.tv_usec = 0; |
6c850772 | 804 | if (!select(fd+1, &r_fds, NULL, &e_fds, &tv)) |
56014c8c | 805 | check_timeout(); |
35c8fd76 WD |
806 | /*if (FD_ISSET(fd, &e_fds)) |
807 | rprintf(FINFO, "select exception on fd %d\n", fd); */ | |
56014c8c WD |
808 | continue; |
809 | } | |
810 | if (cnt != 1) | |
811 | break; | |
ba525f77 | 812 | if (flags & RL_EOL_NULLS ? ch == '\0' : (ch == '\r' || ch == '\n')) { |
67b8f3df | 813 | /* Skip empty lines if dumping comments. */ |
ba525f77 | 814 | if (flags & RL_DUMP_COMMENTS && s == buf) |
56014c8c WD |
815 | continue; |
816 | break; | |
817 | } | |
818 | if (s < eob) | |
819 | *s++ = ch; | |
820 | } | |
821 | *s = '\0'; | |
7a55d06e | 822 | |
ba525f77 | 823 | if (flags & RL_DUMP_COMMENTS && (*buf == '#' || *buf == ';')) |
56014c8c WD |
824 | goto start; |
825 | ||
ba525f77 WD |
826 | #ifdef ICONV_OPTION |
827 | if (flags & RL_CONVERT) { | |
828 | xbuf outbuf; | |
829 | INIT_XBUF(outbuf, buf, 0, bufsiz); | |
830 | iconv_buf.pos = 0; | |
831 | iconv_buf.len = s - iconv_buf.buf; | |
832 | iconvbufs(ic_recv, &iconv_buf, &outbuf, | |
833 | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE); | |
834 | outbuf.buf[outbuf.len] = '\0'; | |
835 | return outbuf.len; | |
836 | } | |
837 | #endif | |
838 | ||
67b8f3df WD |
839 | return s - buf; |
840 | } | |
841 | ||
842 | int read_args(int f_in, char *mod_name, char *buf, size_t bufsiz, int rl_nulls, | |
843 | char ***argv_p, int *argc_p, char **request_p) | |
844 | { | |
845 | int maxargs = MAX_ARGS; | |
846 | int dot_pos = 0; | |
847 | int argc = 0; | |
848 | char **argv, *p; | |
22955408 WD |
849 | int rl_flags = (rl_nulls ? RL_EOL_NULLS : 0); |
850 | ||
851 | #ifdef ICONV_OPTION | |
852 | rl_flags |= (protect_args && ic_recv != (iconv_t)-1 ? RL_CONVERT : 0); | |
853 | #endif | |
67b8f3df WD |
854 | |
855 | if (!(argv = new_array(char *, maxargs))) | |
856 | out_of_memory("read_args"); | |
857 | if (mod_name) | |
858 | argv[argc++] = "rsyncd"; | |
859 | ||
860 | while (1) { | |
ba525f77 | 861 | if (read_line(f_in, buf, bufsiz, rl_flags) == 0) |
67b8f3df WD |
862 | break; |
863 | ||
864 | if (argc == maxargs) { | |
865 | maxargs += MAX_ARGS; | |
866 | if (!(argv = realloc_array(argv, char *, maxargs))) | |
867 | out_of_memory("read_args"); | |
868 | } | |
869 | ||
870 | if (dot_pos) { | |
871 | if (request_p) { | |
872 | *request_p = strdup(buf); | |
873 | request_p = NULL; | |
874 | } | |
875 | if (mod_name) | |
876 | glob_expand_module(mod_name, buf, &argv, &argc, &maxargs); | |
877 | else | |
878 | glob_expand(buf, &argv, &argc, &maxargs); | |
879 | } else { | |
880 | if (!(p = strdup(buf))) | |
881 | out_of_memory("read_args"); | |
882 | argv[argc++] = p; | |
883 | if (*p == '.' && p[1] == '\0') | |
884 | dot_pos = argc; | |
885 | } | |
886 | } | |
887 | ||
888 | *argc_p = argc; | |
889 | *argv_p = argv; | |
890 | ||
891 | return dot_pos ? dot_pos : argc; | |
56014c8c | 892 | } |
7a55d06e | 893 | |
8ef246e0 | 894 | int io_start_buffering_out(int f_out) |
1f75bb10 | 895 | { |
8ef246e0 WD |
896 | if (iobuf_out) { |
897 | assert(f_out == iobuf_f_out); | |
898 | return 0; | |
899 | } | |
1f75bb10 WD |
900 | if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) |
901 | out_of_memory("io_start_buffering_out"); | |
902 | iobuf_out_cnt = 0; | |
8ef246e0 WD |
903 | iobuf_f_out = f_out; |
904 | return 1; | |
1f75bb10 WD |
905 | } |
906 | ||
8ef246e0 | 907 | int io_start_buffering_in(int f_in) |
1f75bb10 | 908 | { |
8ef246e0 WD |
909 | if (iobuf_in) { |
910 | assert(f_in == iobuf_f_in); | |
911 | return 0; | |
912 | } | |
1f75bb10 WD |
913 | iobuf_in_siz = 2 * IO_BUFFER_SIZE; |
914 | if (!(iobuf_in = new_array(char, iobuf_in_siz))) | |
915 | out_of_memory("io_start_buffering_in"); | |
8ef246e0 WD |
916 | iobuf_f_in = f_in; |
917 | return 1; | |
1f75bb10 WD |
918 | } |
919 | ||
8ef246e0 | 920 | void io_end_buffering_in(void) |
1f75bb10 | 921 | { |
8ef246e0 WD |
922 | if (!iobuf_in) |
923 | return; | |
924 | free(iobuf_in); | |
925 | iobuf_in = NULL; | |
926 | iobuf_in_ndx = 0; | |
927 | iobuf_in_remaining = 0; | |
928 | iobuf_f_in = -1; | |
929 | } | |
930 | ||
931 | void io_end_buffering_out(void) | |
932 | { | |
933 | if (!iobuf_out) | |
934 | return; | |
935 | io_flush(FULL_FLUSH); | |
936 | free(iobuf_out); | |
937 | iobuf_out = NULL; | |
938 | iobuf_f_out = -1; | |
1f75bb10 WD |
939 | } |
940 | ||
be91bd81 | 941 | void maybe_flush_socket(int important) |
626bec8e | 942 | { |
be91bd81 WD |
943 | if (iobuf_out && iobuf_out_cnt |
944 | && (important || time(NULL) - last_io_out >= 5)) | |
626bec8e WD |
945 | io_flush(NORMAL_FLUSH); |
946 | } | |
947 | ||
cdf236aa | 948 | void maybe_send_keepalive(void) |
9e2409ab | 949 | { |
3b0a30eb | 950 | if (time(NULL) - last_io_out >= allowed_lull) { |
9e2409ab | 951 | if (!iobuf_out || !iobuf_out_cnt) { |
3221f451 WD |
952 | if (protocol_version < 29) |
953 | return; /* there's nothing we can do */ | |
8ef246e0 | 954 | if (protocol_version >= 30) |
332cf6df | 955 | send_msg(MSG_NOOP, "", 0, 0); |
8ef246e0 | 956 | else { |
9decb4d2 | 957 | write_int(sock_f_out, cur_flist->used); |
8ef246e0 WD |
958 | write_shortint(sock_f_out, ITEM_IS_NEW); |
959 | } | |
9e2409ab WD |
960 | } |
961 | if (iobuf_out) | |
962 | io_flush(NORMAL_FLUSH); | |
963 | } | |
964 | } | |
965 | ||
8ef246e0 WD |
966 | void start_flist_forward(int f_in) |
967 | { | |
968 | assert(iobuf_out != NULL); | |
969 | assert(iobuf_f_out == msg_fd_out); | |
970 | flist_forward_from = f_in; | |
971 | } | |
972 | ||
973 | void stop_flist_forward() | |
974 | { | |
8ef246e0 | 975 | flist_forward_from = -1; |
dde5b772 | 976 | io_flush(FULL_FLUSH); |
8ef246e0 WD |
977 | } |
978 | ||
880da007 MP |
979 | /** |
980 | * Continue trying to read len bytes - don't return until len has been | |
981 | * read. | |
982 | **/ | |
3151cbae | 983 | static void read_loop(int fd, char *buf, size_t len) |
4c36ddbe AT |
984 | { |
985 | while (len) { | |
986 | int n = read_timeout(fd, buf, len); | |
987 | ||
988 | buf += n; | |
989 | len -= n; | |
8d9dc9f9 AT |
990 | } |
991 | } | |
992 | ||
7a55d06e MP |
993 | /** |
994 | * Read from the file descriptor handling multiplexing - return number | |
995 | * of bytes read. | |
d62bcc17 WD |
996 | * |
997 | * Never returns <= 0. | |
7a55d06e | 998 | */ |
c399d22a | 999 | static int readfd_unbuffered(int fd, char *buf, size_t len) |
8d9dc9f9 | 1000 | { |
f2a4853c | 1001 | size_t msg_bytes; |
d8aeda1e | 1002 | int tag, cnt = 0; |
33544bf4 | 1003 | char line[BIGPATHBUFLEN]; |
8d9dc9f9 | 1004 | |
8ef246e0 | 1005 | if (!iobuf_in || fd != iobuf_f_in) |
4c36ddbe | 1006 | return read_timeout(fd, buf, len); |
8d9dc9f9 | 1007 | |
8ef246e0 WD |
1008 | if (!io_multiplexing_in && iobuf_in_remaining == 0) { |
1009 | iobuf_in_remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); | |
1f75bb10 | 1010 | iobuf_in_ndx = 0; |
76c21947 WD |
1011 | } |
1012 | ||
d8aeda1e | 1013 | while (cnt == 0) { |
8ef246e0 WD |
1014 | if (iobuf_in_remaining) { |
1015 | len = MIN(len, iobuf_in_remaining); | |
1f75bb10 WD |
1016 | memcpy(buf, iobuf_in + iobuf_in_ndx, len); |
1017 | iobuf_in_ndx += len; | |
8ef246e0 | 1018 | iobuf_in_remaining -= len; |
d8aeda1e | 1019 | cnt = len; |
76c21947 | 1020 | break; |
8d9dc9f9 AT |
1021 | } |
1022 | ||
909ce14f | 1023 | read_loop(fd, line, 4); |
ff41a59f | 1024 | tag = IVAL(line, 0); |
679e7657 | 1025 | |
f2a4853c | 1026 | msg_bytes = tag & 0xFFFFFF; |
d17e1dd2 | 1027 | tag = (tag >> 24) - MPLEX_BASE; |
8d9dc9f9 | 1028 | |
d17e1dd2 WD |
1029 | switch (tag) { |
1030 | case MSG_DATA: | |
f2a4853c | 1031 | if (msg_bytes > iobuf_in_siz) { |
1f75bb10 | 1032 | if (!(iobuf_in = realloc_array(iobuf_in, char, |
f2a4853c | 1033 | msg_bytes))) |
c399d22a | 1034 | out_of_memory("readfd_unbuffered"); |
f2a4853c | 1035 | iobuf_in_siz = msg_bytes; |
76c21947 | 1036 | } |
f2a4853c | 1037 | read_loop(fd, iobuf_in, msg_bytes); |
8ef246e0 | 1038 | iobuf_in_remaining = msg_bytes; |
1f75bb10 | 1039 | iobuf_in_ndx = 0; |
d17e1dd2 | 1040 | break; |
8ef246e0 WD |
1041 | case MSG_NOOP: |
1042 | if (am_sender) | |
1043 | maybe_send_keepalive(); | |
1044 | break; | |
1045 | case MSG_IO_ERROR: | |
1046 | if (msg_bytes != 4) | |
1047 | goto invalid_msg; | |
1048 | read_loop(fd, line, msg_bytes); | |
e5f35681 | 1049 | send_msg_int(MSG_IO_ERROR, IVAL(line, 0)); |
8ef246e0 WD |
1050 | io_error |= IVAL(line, 0); |
1051 | break; | |
0d67e00a | 1052 | case MSG_DELETED: |
f2a4853c WD |
1053 | if (msg_bytes >= sizeof line) |
1054 | goto overflow; | |
332cf6df WD |
1055 | #ifdef ICONV_OPTION |
1056 | if (ic_recv != (iconv_t)-1) { | |
ba525f77 WD |
1057 | xbuf outbuf, inbuf; |
1058 | char ibuf[512]; | |
332cf6df | 1059 | int add_null = 0; |
ba525f77 WD |
1060 | int pos = 0; |
1061 | ||
1062 | INIT_CONST_XBUF(outbuf, line); | |
1063 | inbuf.buf = ibuf; | |
1064 | ||
332cf6df | 1065 | while (msg_bytes) { |
ba525f77 WD |
1066 | inbuf.len = msg_bytes > sizeof ibuf |
1067 | ? sizeof ibuf : msg_bytes; | |
1068 | read_loop(fd, inbuf.buf, inbuf.len); | |
1069 | if (!(msg_bytes -= inbuf.len) | |
1070 | && !ibuf[inbuf.len-1]) | |
1071 | inbuf.len--, add_null = 1; | |
1072 | if (iconvbufs(ic_send, &inbuf, &outbuf, | |
1073 | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE) < 0) | |
1074 | goto overflow; | |
1075 | pos = -1; | |
1076 | } | |
1077 | if (add_null) { | |
1078 | if (outbuf.len == outbuf.size) | |
1079 | goto overflow; | |
1080 | outbuf.buf[outbuf.len++] = '\0'; | |
332cf6df | 1081 | } |
ba525f77 | 1082 | msg_bytes = outbuf.len; |
332cf6df WD |
1083 | } else |
1084 | #endif | |
1085 | read_loop(fd, line, msg_bytes); | |
0d67e00a | 1086 | /* A directory name was sent with the trailing null */ |
f2a4853c | 1087 | if (msg_bytes > 0 && !line[msg_bytes-1]) |
0d67e00a | 1088 | log_delete(line, S_IFDIR); |
12bda6f7 WD |
1089 | else { |
1090 | line[msg_bytes] = '\0'; | |
0d67e00a | 1091 | log_delete(line, S_IFREG); |
12bda6f7 | 1092 | } |
0d67e00a | 1093 | break; |
9981c27e | 1094 | case MSG_SUCCESS: |
f2a4853c | 1095 | if (msg_bytes != 4) { |
8ef246e0 | 1096 | invalid_msg: |
cdf236aa | 1097 | rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n", |
f2a4853c | 1098 | tag, (long)msg_bytes, who_am_i()); |
9981c27e WD |
1099 | exit_cleanup(RERR_STREAMIO); |
1100 | } | |
f2a4853c | 1101 | read_loop(fd, line, msg_bytes); |
9981c27e | 1102 | successful_send(IVAL(line, 0)); |
9981c27e | 1103 | break; |
8ef246e0 WD |
1104 | case MSG_NO_SEND: |
1105 | if (msg_bytes != 4) | |
1106 | goto invalid_msg; | |
1107 | read_loop(fd, line, msg_bytes); | |
1108 | send_msg_int(MSG_NO_SEND, IVAL(line, 0)); | |
1109 | break; | |
d17e1dd2 WD |
1110 | case MSG_INFO: |
1111 | case MSG_ERROR: | |
f2a4853c WD |
1112 | if (msg_bytes >= sizeof line) { |
1113 | overflow: | |
bd9fca47 | 1114 | rprintf(FERROR, |
cdf236aa | 1115 | "multiplexing overflow %d:%ld [%s]\n", |
f2a4853c | 1116 | tag, (long)msg_bytes, who_am_i()); |
d17e1dd2 WD |
1117 | exit_cleanup(RERR_STREAMIO); |
1118 | } | |
f2a4853c | 1119 | read_loop(fd, line, msg_bytes); |
332cf6df | 1120 | rwrite((enum logcode)tag, line, msg_bytes, 1); |
d17e1dd2 WD |
1121 | break; |
1122 | default: | |
cdf236aa WD |
1123 | rprintf(FERROR, "unexpected tag %d [%s]\n", |
1124 | tag, who_am_i()); | |
65417579 | 1125 | exit_cleanup(RERR_STREAMIO); |
8d9dc9f9 | 1126 | } |
8d9dc9f9 AT |
1127 | } |
1128 | ||
8ef246e0 | 1129 | if (iobuf_in_remaining == 0) |
d17e1dd2 | 1130 | io_flush(NORMAL_FLUSH); |
76c21947 | 1131 | |
d8aeda1e | 1132 | return cnt; |
8d9dc9f9 AT |
1133 | } |
1134 | ||
dde5b772 WD |
1135 | /* Do a buffered read from fd. Don't return until all N bytes have |
1136 | * been read. If all N can't be read then exit with an error. */ | |
3151cbae | 1137 | static void readfd(int fd, char *buffer, size_t N) |
720b47f2 | 1138 | { |
d8aeda1e | 1139 | int cnt; |
d62bcc17 | 1140 | size_t total = 0; |
3151cbae | 1141 | |
6ba9279f | 1142 | while (total < N) { |
d8aeda1e WD |
1143 | cnt = readfd_unbuffered(fd, buffer + total, N-total); |
1144 | total += cnt; | |
7f28dbee | 1145 | } |
1b7c47cb | 1146 | |
b9f592fb WD |
1147 | if (fd == write_batch_monitor_in) { |
1148 | if ((size_t)write(batch_fd, buffer, total) != total) | |
1149 | exit_cleanup(RERR_FILEIO); | |
1150 | } | |
1f75bb10 | 1151 | |
8ef246e0 WD |
1152 | if (fd == flist_forward_from) |
1153 | writefd(iobuf_f_out, buffer, total); | |
1154 | ||
1f75bb10 WD |
1155 | if (fd == sock_f_in) |
1156 | stats.total_read += total; | |
720b47f2 AT |
1157 | } |
1158 | ||
3a993aa4 | 1159 | unsigned short read_shortint(int f) |
9361f839 | 1160 | { |
482f48cc WD |
1161 | char b[2]; |
1162 | readfd(f, b, 2); | |
1163 | return (UVAL(b, 1) << 8) + UVAL(b, 0); | |
9361f839 WD |
1164 | } |
1165 | ||
b7922338 | 1166 | int32 read_int(int f) |
720b47f2 | 1167 | { |
4c36ddbe | 1168 | char b[4]; |
d8aeda1e | 1169 | int32 num; |
d730b113 | 1170 | |
482f48cc WD |
1171 | readfd(f, b, 4); |
1172 | num = IVAL(b, 0); | |
1173 | #if SIZEOF_INT32 > 4 | |
1174 | if (num & (int32)0x80000000) | |
1175 | num |= ~(int32)0xffffffff; | |
1176 | #endif | |
d8aeda1e | 1177 | return num; |
720b47f2 AT |
1178 | } |
1179 | ||
351e23ad | 1180 | int32 read_varint(int f) |
3a6a366f | 1181 | { |
351e23ad WD |
1182 | union { |
1183 | char b[5]; | |
1184 | int32 x; | |
1185 | } u; | |
1186 | uchar ch; | |
1187 | int extra; | |
1188 | ||
1189 | u.x = 0; | |
1190 | readfd(f, (char*)&ch, 1); | |
1191 | extra = int_byte_extra[ch / 4]; | |
1192 | if (extra) { | |
1193 | uchar bit = ((uchar)1<<(8-extra)); | |
1194 | if (extra >= (int)sizeof u.b) { | |
1195 | rprintf(FERROR, "Overflow in read_varint()\n"); | |
1196 | exit_cleanup(RERR_STREAMIO); | |
1197 | } | |
1198 | readfd(f, u.b, extra); | |
1199 | u.b[extra] = ch & (bit-1); | |
1200 | } else | |
1201 | u.b[0] = ch; | |
1202 | #if CAREFUL_ALIGNMENT | |
1203 | u.x = IVAL(u.b,0); | |
1204 | #endif | |
1205 | #if SIZEOF_INT32 > 4 | |
1206 | if (u.x & (int32)0x80000000) | |
1207 | u.x |= ~(int32)0xffffffff; | |
1208 | #endif | |
1209 | return u.x; | |
1210 | } | |
71c46176 | 1211 | |
351e23ad WD |
1212 | int64 read_varlong(int f, uchar min_bytes) |
1213 | { | |
1214 | union { | |
1215 | char b[9]; | |
1216 | int64 x; | |
1217 | } u; | |
1218 | char b2[8]; | |
1219 | int extra; | |
71c46176 | 1220 | |
031fa9ad | 1221 | #if SIZEOF_INT64 < 8 |
351e23ad | 1222 | memset(u.b, 0, 8); |
031fa9ad | 1223 | #else |
351e23ad | 1224 | u.x = 0; |
031fa9ad | 1225 | #endif |
351e23ad WD |
1226 | readfd(f, b2, min_bytes); |
1227 | memcpy(u.b, b2+1, min_bytes-1); | |
1228 | extra = int_byte_extra[CVAL(b2, 0) / 4]; | |
1229 | if (extra) { | |
1230 | uchar bit = ((uchar)1<<(8-extra)); | |
1231 | if (min_bytes + extra > (int)sizeof u.b) { | |
1232 | rprintf(FERROR, "Overflow in read_varlong()\n"); | |
1233 | exit_cleanup(RERR_STREAMIO); | |
1234 | } | |
1235 | readfd(f, u.b + min_bytes - 1, extra); | |
1236 | u.b[min_bytes + extra - 1] = CVAL(b2, 0) & (bit-1); | |
4ea4acf1 | 1237 | #if SIZEOF_INT64 < 8 |
351e23ad | 1238 | if (min_bytes + extra > 5 || u.b[4] || CVAL(u.b,3) & 0x80) { |
4ea4acf1 WD |
1239 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
1240 | exit_cleanup(RERR_UNSUPPORTED); | |
1241 | } | |
1242 | #endif | |
351e23ad WD |
1243 | } else |
1244 | u.b[min_bytes + extra - 1] = CVAL(b2, 0); | |
1245 | #if SIZEOF_INT64 < 8 | |
1246 | u.x = IVAL(u.b,0); | |
1247 | #elif CAREFUL_ALIGNMENT | |
1248 | u.x = IVAL(u.b,0) | (((int64)IVAL(u.b,4))<<32); | |
1249 | #endif | |
1250 | return u.x; | |
1251 | } | |
1252 | ||
1253 | int64 read_longint(int f) | |
1254 | { | |
4ea4acf1 | 1255 | #if SIZEOF_INT64 >= 8 |
351e23ad | 1256 | char b[9]; |
4ea4acf1 | 1257 | #endif |
351e23ad | 1258 | int32 num = read_int(f); |
71c46176 | 1259 | |
351e23ad WD |
1260 | if (num != (int32)0xffffffff) |
1261 | return num; | |
1262 | ||
1263 | #if SIZEOF_INT64 < 8 | |
1264 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1265 | exit_cleanup(RERR_UNSUPPORTED); | |
1266 | #else | |
1267 | readfd(f, b, 8); | |
1268 | return IVAL(b,0) | (((int64)IVAL(b,4))<<32); | |
1269 | #endif | |
3a6a366f AT |
1270 | } |
1271 | ||
4a19c3b2 | 1272 | void read_buf(int f, char *buf, size_t len) |
720b47f2 | 1273 | { |
4c36ddbe | 1274 | readfd(f,buf,len); |
720b47f2 AT |
1275 | } |
1276 | ||
4a19c3b2 | 1277 | void read_sbuf(int f, char *buf, size_t len) |
575f2fca | 1278 | { |
93095cbe | 1279 | readfd(f, buf, len); |
af436313 | 1280 | buf[len] = '\0'; |
575f2fca AT |
1281 | } |
1282 | ||
9361f839 | 1283 | uchar read_byte(int f) |
182dca5c | 1284 | { |
9361f839 | 1285 | uchar c; |
93095cbe | 1286 | readfd(f, (char *)&c, 1); |
4c36ddbe | 1287 | return c; |
182dca5c | 1288 | } |
720b47f2 | 1289 | |
46e99b09 WD |
1290 | int read_vstring(int f, char *buf, int bufsize) |
1291 | { | |
1292 | int len = read_byte(f); | |
1293 | ||
1294 | if (len & 0x80) | |
1295 | len = (len & ~0x80) * 0x100 + read_byte(f); | |
1296 | ||
1297 | if (len >= bufsize) { | |
1298 | rprintf(FERROR, "over-long vstring received (%d > %d)\n", | |
1299 | len, bufsize - 1); | |
9a6ed83f | 1300 | return -1; |
46e99b09 WD |
1301 | } |
1302 | ||
1303 | if (len) | |
1304 | readfd(f, buf, len); | |
1305 | buf[len] = '\0'; | |
1306 | return len; | |
1307 | } | |
1308 | ||
188fed95 WD |
1309 | /* Populate a sum_struct with values from the socket. This is |
1310 | * called by both the sender and the receiver. */ | |
1311 | void read_sum_head(int f, struct sum_struct *sum) | |
1312 | { | |
1313 | sum->count = read_int(f); | |
c638caa6 WD |
1314 | if (sum->count < 0) { |
1315 | rprintf(FERROR, "Invalid checksum count %ld [%s]\n", | |
1316 | (long)sum->count, who_am_i()); | |
1317 | exit_cleanup(RERR_PROTOCOL); | |
1318 | } | |
188fed95 WD |
1319 | sum->blength = read_int(f); |
1320 | if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { | |
cdf236aa WD |
1321 | rprintf(FERROR, "Invalid block length %ld [%s]\n", |
1322 | (long)sum->blength, who_am_i()); | |
188fed95 WD |
1323 | exit_cleanup(RERR_PROTOCOL); |
1324 | } | |
1325 | sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); | |
a0456b9c | 1326 | if (sum->s2length < 0 || sum->s2length > MAX_DIGEST_LEN) { |
cdf236aa WD |
1327 | rprintf(FERROR, "Invalid checksum length %d [%s]\n", |
1328 | sum->s2length, who_am_i()); | |
188fed95 WD |
1329 | exit_cleanup(RERR_PROTOCOL); |
1330 | } | |
1331 | sum->remainder = read_int(f); | |
1332 | if (sum->remainder < 0 || sum->remainder > sum->blength) { | |
cdf236aa WD |
1333 | rprintf(FERROR, "Invalid remainder length %ld [%s]\n", |
1334 | (long)sum->remainder, who_am_i()); | |
188fed95 WD |
1335 | exit_cleanup(RERR_PROTOCOL); |
1336 | } | |
1337 | } | |
1338 | ||
c207d7ec WD |
1339 | /* Send the values from a sum_struct over the socket. Set sum to |
1340 | * NULL if there are no checksums to send. This is called by both | |
1341 | * the generator and the sender. */ | |
1342 | void write_sum_head(int f, struct sum_struct *sum) | |
1343 | { | |
1344 | static struct sum_struct null_sum; | |
1345 | ||
1346 | if (sum == NULL) | |
1347 | sum = &null_sum; | |
1348 | ||
1349 | write_int(f, sum->count); | |
1350 | write_int(f, sum->blength); | |
1351 | if (protocol_version >= 27) | |
1352 | write_int(f, sum->s2length); | |
1353 | write_int(f, sum->remainder); | |
1354 | } | |
1355 | ||
08571358 MP |
1356 | /** |
1357 | * Sleep after writing to limit I/O bandwidth usage. | |
1358 | * | |
1359 | * @todo Rather than sleeping after each write, it might be better to | |
1360 | * use some kind of averaging. The current algorithm seems to always | |
1361 | * use a bit less bandwidth than specified, because it doesn't make up | |
1362 | * for slow periods. But arguably this is a feature. In addition, we | |
1363 | * ought to take the time used to write the data into account. | |
71e58630 WD |
1364 | * |
1365 | * During some phases of big transfers (file FOO is uptodate) this is | |
1366 | * called with a small bytes_written every time. As the kernel has to | |
1367 | * round small waits up to guarantee that we actually wait at least the | |
1368 | * requested number of microseconds, this can become grossly inaccurate. | |
1369 | * We therefore keep track of the bytes we've written over time and only | |
1370 | * sleep when the accumulated delay is at least 1 tenth of a second. | |
08571358 MP |
1371 | **/ |
1372 | static void sleep_for_bwlimit(int bytes_written) | |
1373 | { | |
71e58630 | 1374 | static struct timeval prior_tv; |
0f78b815 | 1375 | static long total_written = 0; |
71e58630 WD |
1376 | struct timeval tv, start_tv; |
1377 | long elapsed_usec, sleep_usec; | |
1378 | ||
1379 | #define ONE_SEC 1000000L /* # of microseconds in a second */ | |
08571358 | 1380 | |
9a0cfff5 | 1381 | if (!bwlimit_writemax) |
08571358 | 1382 | return; |
e681e820 | 1383 | |
0f78b815 | 1384 | total_written += bytes_written; |
71e58630 WD |
1385 | |
1386 | gettimeofday(&start_tv, NULL); | |
1387 | if (prior_tv.tv_sec) { | |
1388 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC | |
1389 | + (start_tv.tv_usec - prior_tv.tv_usec); | |
1390 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); | |
1391 | if (total_written < 0) | |
1392 | total_written = 0; | |
1393 | } | |
3151cbae | 1394 | |
71e58630 WD |
1395 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
1396 | if (sleep_usec < ONE_SEC / 10) { | |
1397 | prior_tv = start_tv; | |
1398 | return; | |
1399 | } | |
08571358 | 1400 | |
71e58630 WD |
1401 | tv.tv_sec = sleep_usec / ONE_SEC; |
1402 | tv.tv_usec = sleep_usec % ONE_SEC; | |
98b332ed | 1403 | select(0, NULL, NULL, NULL, &tv); |
71e58630 WD |
1404 | |
1405 | gettimeofday(&prior_tv, NULL); | |
1406 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC | |
1407 | + (prior_tv.tv_usec - start_tv.tv_usec); | |
1408 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); | |
08571358 MP |
1409 | } |
1410 | ||
1f75bb10 | 1411 | /* Write len bytes to the file descriptor fd, looping as necessary to get |
0fb2fc4a | 1412 | * the job done and also (in certain circumstances) reading any data on |
af436313 | 1413 | * msg_fd_in to avoid deadlock. |
880da007 MP |
1414 | * |
1415 | * This function underlies the multiplexing system. The body of the | |
1f75bb10 | 1416 | * application never calls this function directly. */ |
4a19c3b2 | 1417 | static void writefd_unbuffered(int fd, const char *buf, size_t len) |
720b47f2 | 1418 | { |
1ea087a7 | 1419 | size_t n, total = 0; |
6c850772 | 1420 | fd_set w_fds, r_fds, e_fds; |
d8aeda1e | 1421 | int maxfd, count, cnt, using_r_fds; |
e4c877cf | 1422 | int defer_inc = 0; |
8d9dc9f9 | 1423 | struct timeval tv; |
720b47f2 | 1424 | |
3be97bf9 | 1425 | if (no_flush++) |
e4c877cf | 1426 | defer_forwarding_messages++, defer_inc++; |
e44f9a12 | 1427 | |
4c36ddbe | 1428 | while (total < len) { |
8d9dc9f9 | 1429 | FD_ZERO(&w_fds); |
6c850772 WD |
1430 | FD_SET(fd, &w_fds); |
1431 | FD_ZERO(&e_fds); | |
1432 | FD_SET(fd, &e_fds); | |
1ea087a7 | 1433 | maxfd = fd; |
4c36ddbe | 1434 | |
954bbed8 | 1435 | if (msg_fd_in >= 0) { |
56014c8c | 1436 | FD_ZERO(&r_fds); |
6c850772 | 1437 | FD_SET(msg_fd_in, &r_fds); |
1ea087a7 WD |
1438 | if (msg_fd_in > maxfd) |
1439 | maxfd = msg_fd_in; | |
3eeac9bc WD |
1440 | using_r_fds = 1; |
1441 | } else | |
1442 | using_r_fds = 0; | |
8d9dc9f9 | 1443 | |
e626b29e | 1444 | tv.tv_sec = select_timeout; |
8d9dc9f9 | 1445 | tv.tv_usec = 0; |
4c36ddbe | 1446 | |
554e0a8d | 1447 | errno = 0; |
3eeac9bc | 1448 | count = select(maxfd + 1, using_r_fds ? &r_fds : NULL, |
6c850772 | 1449 | &w_fds, &e_fds, &tv); |
4c36ddbe AT |
1450 | |
1451 | if (count <= 0) { | |
1ea087a7 | 1452 | if (count < 0 && errno == EBADF) |
554e0a8d | 1453 | exit_cleanup(RERR_SOCKETIO); |
bd717af8 | 1454 | check_timeout(); |
8d9dc9f9 AT |
1455 | continue; |
1456 | } | |
4c36ddbe | 1457 | |
35c8fd76 WD |
1458 | /*if (FD_ISSET(fd, &e_fds)) |
1459 | rprintf(FINFO, "select exception on fd %d\n", fd); */ | |
6c850772 | 1460 | |
3eeac9bc | 1461 | if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds)) |
d17e1dd2 | 1462 | read_msg_fd(); |
554e0a8d | 1463 | |
9a6ed83f | 1464 | if (!FD_ISSET(fd, &w_fds)) |
1ea087a7 | 1465 | continue; |
4c36ddbe | 1466 | |
1ea087a7 | 1467 | n = len - total; |
9a0cfff5 | 1468 | if (bwlimit_writemax && n > bwlimit_writemax) |
1ea087a7 | 1469 | n = bwlimit_writemax; |
d8aeda1e | 1470 | cnt = write(fd, buf + total, n); |
1ea087a7 | 1471 | |
d8aeda1e WD |
1472 | if (cnt <= 0) { |
1473 | if (cnt < 0) { | |
3309507d WD |
1474 | if (errno == EINTR) |
1475 | continue; | |
1476 | if (errno == EWOULDBLOCK || errno == EAGAIN) { | |
1477 | msleep(1); | |
1478 | continue; | |
1479 | } | |
f0359dd0 AT |
1480 | } |
1481 | ||
1ea087a7 | 1482 | /* Don't try to write errors back across the stream. */ |
1f75bb10 | 1483 | if (fd == sock_f_out) |
8ef246e0 | 1484 | io_end_multiplex_out(); |
2a5df862 WD |
1485 | /* Don't try to write errors down a failing msg pipe. */ |
1486 | if (am_server && fd == msg_fd_out) | |
1487 | exit_cleanup(RERR_STREAMIO); | |
1ea087a7 | 1488 | rsyserr(FERROR, errno, |
b88c2e8f WD |
1489 | "writefd_unbuffered failed to write %ld bytes [%s]", |
1490 | (long)len, who_am_i()); | |
d1b31da7 WD |
1491 | /* If the other side is sending us error messages, try |
1492 | * to grab any messages they sent before they died. */ | |
f2179fd3 | 1493 | while (!am_server && fd == sock_f_out && io_multiplexing_in) { |
ba525f77 | 1494 | char buf[1024]; |
3b0a30eb | 1495 | set_io_timeout(30); |
9e2409ab | 1496 | ignore_timeout = 0; |
ba525f77 | 1497 | readfd_unbuffered(sock_f_in, buf, sizeof buf); |
d1b31da7 | 1498 | } |
1ea087a7 WD |
1499 | exit_cleanup(RERR_STREAMIO); |
1500 | } | |
4c36ddbe | 1501 | |
d8aeda1e | 1502 | total += cnt; |
e4c877cf | 1503 | defer_forwarding_messages++, defer_inc++; |
a800434a | 1504 | |
1f75bb10 | 1505 | if (fd == sock_f_out) { |
626bec8e | 1506 | if (io_timeout || am_generator) |
3b0a30eb | 1507 | last_io_out = time(NULL); |
d8aeda1e | 1508 | sleep_for_bwlimit(cnt); |
1f75bb10 | 1509 | } |
4c36ddbe | 1510 | } |
e44f9a12 AT |
1511 | |
1512 | no_flush--; | |
17a4977b WD |
1513 | defer_inc -= defer_forwarding_keep; |
1514 | if (!(defer_forwarding_messages -= defer_inc) && !no_flush) | |
e4c877cf | 1515 | msg_flush(); |
d6dead6b AT |
1516 | } |
1517 | ||
dde5b772 | 1518 | void io_flush(int flush_it_all) |
d6dead6b | 1519 | { |
1f75bb10 | 1520 | if (!iobuf_out_cnt || no_flush) |
d17e1dd2 | 1521 | return; |
8d9dc9f9 | 1522 | |
d17e1dd2 | 1523 | if (io_multiplexing_out) |
332cf6df | 1524 | mplex_write(sock_f_out, MSG_DATA, iobuf_out, iobuf_out_cnt, 0); |
d17e1dd2 | 1525 | else |
8ef246e0 | 1526 | writefd_unbuffered(iobuf_f_out, iobuf_out, iobuf_out_cnt); |
1f75bb10 | 1527 | iobuf_out_cnt = 0; |
e4c877cf WD |
1528 | |
1529 | if (flush_it_all && !defer_forwarding_messages) | |
1530 | msg_flush(); | |
8d9dc9f9 AT |
1531 | } |
1532 | ||
4a19c3b2 | 1533 | static void writefd(int fd, const char *buf, size_t len) |
d6dead6b | 1534 | { |
1f75bb10 WD |
1535 | if (fd == sock_f_out) |
1536 | stats.total_written += len; | |
1537 | ||
b9f592fb WD |
1538 | if (fd == write_batch_monitor_out) { |
1539 | if ((size_t)write(batch_fd, buf, len) != len) | |
1540 | exit_cleanup(RERR_FILEIO); | |
1541 | } | |
1542 | ||
8ef246e0 | 1543 | if (!iobuf_out || fd != iobuf_f_out) { |
4c36ddbe AT |
1544 | writefd_unbuffered(fd, buf, len); |
1545 | return; | |
1546 | } | |
d6dead6b AT |
1547 | |
1548 | while (len) { | |
1f75bb10 | 1549 | int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt); |
d6dead6b | 1550 | if (n > 0) { |
1f75bb10 | 1551 | memcpy(iobuf_out+iobuf_out_cnt, buf, n); |
d6dead6b AT |
1552 | buf += n; |
1553 | len -= n; | |
1f75bb10 | 1554 | iobuf_out_cnt += n; |
d6dead6b | 1555 | } |
3151cbae | 1556 | |
1f75bb10 | 1557 | if (iobuf_out_cnt == IO_BUFFER_SIZE) |
d17e1dd2 | 1558 | io_flush(NORMAL_FLUSH); |
d6dead6b | 1559 | } |
d6dead6b | 1560 | } |
720b47f2 | 1561 | |
3a993aa4 | 1562 | void write_shortint(int f, unsigned short x) |
9361f839 | 1563 | { |
3a993aa4 WD |
1564 | char b[2]; |
1565 | b[0] = (char)x; | |
1566 | b[1] = (char)(x >> 8); | |
1567 | writefd(f, b, 2); | |
9361f839 WD |
1568 | } |
1569 | ||
351e23ad WD |
1570 | void write_int(int f, int32 x) |
1571 | { | |
1572 | char b[4]; | |
1573 | SIVAL(b, 0, x); | |
1574 | writefd(f, b, 4); | |
1575 | } | |
1576 | ||
f31514ad | 1577 | void write_varint(int f, int32 x) |
1c3344a1 WD |
1578 | { |
1579 | char b[5]; | |
351e23ad WD |
1580 | uchar bit; |
1581 | int cnt = 4; | |
1582 | ||
1583 | SIVAL(b, 1, x); | |
1584 | ||
1585 | while (cnt > 1 && b[cnt] == 0) | |
1586 | cnt--; | |
1587 | bit = ((uchar)1<<(7-cnt+1)); | |
1588 | if (CVAL(b, cnt) >= bit) { | |
1589 | cnt++; | |
1590 | *b = ~(bit-1); | |
1591 | } else if (cnt > 1) | |
1592 | *b = b[cnt] | ~(bit*2-1); | |
1593 | else | |
1594 | *b = b[cnt]; | |
1595 | ||
1596 | writefd(f, b, cnt); | |
1c3344a1 WD |
1597 | } |
1598 | ||
351e23ad | 1599 | void write_varlong(int f, int64 x, uchar min_bytes) |
720b47f2 | 1600 | { |
351e23ad WD |
1601 | char b[9]; |
1602 | uchar bit; | |
1603 | int cnt = 8; | |
1604 | ||
1605 | SIVAL(b, 1, x); | |
1606 | #if SIZEOF_INT64 >= 8 | |
1607 | SIVAL(b, 5, x >> 32); | |
1608 | #else | |
1609 | if (x <= 0x7FFFFFFF && x >= 0) | |
1610 | memset(b + 5, 0, 4); | |
1611 | else { | |
1612 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); | |
1613 | exit_cleanup(RERR_UNSUPPORTED); | |
1614 | } | |
1615 | #endif | |
1616 | ||
1617 | while (cnt > min_bytes && b[cnt] == 0) | |
1618 | cnt--; | |
1619 | bit = ((uchar)1<<(7-cnt+min_bytes)); | |
1620 | if (CVAL(b, cnt) >= bit) { | |
1621 | cnt++; | |
1622 | *b = ~(bit-1); | |
1623 | } else if (cnt > min_bytes) | |
1624 | *b = b[cnt] | ~(bit*2-1); | |
1625 | else | |
1626 | *b = b[cnt]; | |
1627 | ||
1628 | writefd(f, b, cnt); | |
720b47f2 AT |
1629 | } |
1630 | ||
7a24c346 MP |
1631 | /* |
1632 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any | |
1633 | * 64-bit types on this platform. | |
1634 | */ | |
71c46176 | 1635 | void write_longint(int f, int64 x) |
3a6a366f | 1636 | { |
351e23ad | 1637 | char b[12], * const s = b+4; |
3a6a366f | 1638 | |
351e23ad WD |
1639 | SIVAL(s, 0, x); |
1640 | if (x <= 0x7FFFFFFF && x >= 0) { | |
482f48cc | 1641 | writefd(f, s, 4); |
351e23ad WD |
1642 | return; |
1643 | } | |
3a6a366f | 1644 | |
4ea4acf1 | 1645 | #if SIZEOF_INT64 < 8 |
351e23ad WD |
1646 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
1647 | exit_cleanup(RERR_UNSUPPORTED); | |
4ea4acf1 | 1648 | #else |
351e23ad WD |
1649 | memset(b, 0xFF, 4); |
1650 | SIVAL(s, 4, x >> 32); | |
1651 | writefd(f, b, 12); | |
4ea4acf1 | 1652 | #endif |
3a6a366f AT |
1653 | } |
1654 | ||
4a19c3b2 | 1655 | void write_buf(int f, const char *buf, size_t len) |
720b47f2 | 1656 | { |
4c36ddbe | 1657 | writefd(f,buf,len); |
720b47f2 AT |
1658 | } |
1659 | ||
880da007 | 1660 | /** Write a string to the connection */ |
4a19c3b2 | 1661 | void write_sbuf(int f, const char *buf) |
f0fca04e | 1662 | { |
93095cbe | 1663 | writefd(f, buf, strlen(buf)); |
f0fca04e AT |
1664 | } |
1665 | ||
9361f839 | 1666 | void write_byte(int f, uchar c) |
182dca5c | 1667 | { |
93095cbe | 1668 | writefd(f, (char *)&c, 1); |
182dca5c AT |
1669 | } |
1670 | ||
4a19c3b2 | 1671 | void write_vstring(int f, const char *str, int len) |
46e99b09 WD |
1672 | { |
1673 | uchar lenbuf[3], *lb = lenbuf; | |
1674 | ||
1675 | if (len > 0x7F) { | |
1676 | if (len > 0x7FFF) { | |
1677 | rprintf(FERROR, | |
1678 | "attempting to send over-long vstring (%d > %d)\n", | |
1679 | len, 0x7FFF); | |
1680 | exit_cleanup(RERR_PROTOCOL); | |
1681 | } | |
1682 | *lb++ = len / 0x100 + 0x80; | |
1683 | } | |
1684 | *lb = len; | |
1685 | ||
1686 | writefd(f, (char*)lenbuf, lb - lenbuf + 1); | |
1687 | if (len) | |
1688 | writefd(f, str, len); | |
1689 | } | |
1690 | ||
8a65e0ce WD |
1691 | /* Send a file-list index using a byte-reduction method. */ |
1692 | void write_ndx(int f, int32 ndx) | |
1693 | { | |
1694 | static int32 prev_positive = -1, prev_negative = 1; | |
1695 | int32 diff, cnt = 0; | |
1696 | char b[6]; | |
1697 | ||
1698 | if (protocol_version < 30 || read_batch) { | |
1699 | write_int(f, ndx); | |
1700 | return; | |
1701 | } | |
1702 | ||
1703 | /* Send NDX_DONE as a single-byte 0 with no side effects. Send | |
1704 | * negative nums as a positive after sending a leading 0xFF. */ | |
1705 | if (ndx >= 0) { | |
1706 | diff = ndx - prev_positive; | |
1707 | prev_positive = ndx; | |
1708 | } else if (ndx == NDX_DONE) { | |
1709 | *b = 0; | |
1710 | writefd(f, b, 1); | |
1711 | return; | |
1712 | } else { | |
1713 | b[cnt++] = (char)0xFF; | |
1714 | ndx = -ndx; | |
1715 | diff = ndx - prev_negative; | |
1716 | prev_negative = ndx; | |
1717 | } | |
1718 | ||
1719 | /* A diff of 1 - 253 is sent as a one-byte diff; a diff of 254 - 32767 | |
1720 | * or 0 is sent as a 0xFE + a two-byte diff; otherwise we send 0xFE | |
1721 | * & all 4 bytes of the (non-negative) num with the high-bit set. */ | |
1722 | if (diff < 0xFE && diff > 0) | |
1723 | b[cnt++] = (char)diff; | |
1724 | else if (diff < 0 || diff > 0x7FFF) { | |
1725 | b[cnt++] = (char)0xFE; | |
1726 | b[cnt++] = (char)((ndx >> 24) | 0x80); | |
8a65e0ce | 1727 | b[cnt++] = (char)ndx; |
351e23ad WD |
1728 | b[cnt++] = (char)(ndx >> 8); |
1729 | b[cnt++] = (char)(ndx >> 16); | |
8a65e0ce WD |
1730 | } else { |
1731 | b[cnt++] = (char)0xFE; | |
1732 | b[cnt++] = (char)(diff >> 8); | |
1733 | b[cnt++] = (char)diff; | |
1734 | } | |
1735 | writefd(f, b, cnt); | |
1736 | } | |
1737 | ||
1738 | /* Receive a file-list index using a byte-reduction method. */ | |
1739 | int32 read_ndx(int f) | |
1740 | { | |
1741 | static int32 prev_positive = -1, prev_negative = 1; | |
1742 | int32 *prev_ptr, num; | |
1743 | char b[4]; | |
1744 | ||
1745 | if (protocol_version < 30) | |
1746 | return read_int(f); | |
1747 | ||
1748 | readfd(f, b, 1); | |
1749 | if (CVAL(b, 0) == 0xFF) { | |
1750 | readfd(f, b, 1); | |
1751 | prev_ptr = &prev_negative; | |
1752 | } else if (CVAL(b, 0) == 0) | |
1753 | return NDX_DONE; | |
1754 | else | |
1755 | prev_ptr = &prev_positive; | |
1756 | if (CVAL(b, 0) == 0xFE) { | |
1757 | readfd(f, b, 2); | |
1758 | if (CVAL(b, 0) & 0x80) { | |
351e23ad WD |
1759 | b[3] = CVAL(b, 0) & ~0x80; |
1760 | b[0] = b[1]; | |
1761 | readfd(f, b+1, 2); | |
1762 | num = IVAL(b, 0); | |
8a65e0ce | 1763 | } else |
351e23ad | 1764 | num = (UVAL(b,0)<<8) + UVAL(b,1) + *prev_ptr; |
8a65e0ce | 1765 | } else |
351e23ad | 1766 | num = UVAL(b, 0) + *prev_ptr; |
8a65e0ce WD |
1767 | *prev_ptr = num; |
1768 | if (prev_ptr == &prev_negative) | |
1769 | num = -num; | |
1770 | return num; | |
1771 | } | |
1772 | ||
67b8f3df WD |
1773 | /* Read a line of up to bufsiz-1 characters into buf. Strips |
1774 | * the (required) trailing newline and all carriage returns. | |
1775 | * Returns 1 for success; 0 for I/O error or truncation. */ | |
1776 | int read_line_old(int f, char *buf, size_t bufsiz) | |
f0fca04e | 1777 | { |
67b8f3df WD |
1778 | bufsiz--; /* leave room for the null */ |
1779 | while (bufsiz > 0) { | |
528bfcd7 | 1780 | buf[0] = 0; |
f0fca04e | 1781 | read_buf(f, buf, 1); |
914cc65c MP |
1782 | if (buf[0] == 0) |
1783 | return 0; | |
6ed6d7f5 | 1784 | if (buf[0] == '\n') |
f0fca04e | 1785 | break; |
f0fca04e AT |
1786 | if (buf[0] != '\r') { |
1787 | buf++; | |
67b8f3df | 1788 | bufsiz--; |
f0fca04e AT |
1789 | } |
1790 | } | |
6ed6d7f5 | 1791 | *buf = '\0'; |
67b8f3df | 1792 | return bufsiz > 0; |
f0fca04e AT |
1793 | } |
1794 | ||
f0fca04e AT |
1795 | void io_printf(int fd, const char *format, ...) |
1796 | { | |
d62bcc17 | 1797 | va_list ap; |
33544bf4 | 1798 | char buf[BIGPATHBUFLEN]; |
f0fca04e | 1799 | int len; |
3151cbae | 1800 | |
f0fca04e | 1801 | va_start(ap, format); |
3151cbae | 1802 | len = vsnprintf(buf, sizeof buf, format, ap); |
f0fca04e AT |
1803 | va_end(ap); |
1804 | ||
f89b9368 WD |
1805 | if (len < 0) |
1806 | exit_cleanup(RERR_STREAMIO); | |
f0fca04e | 1807 | |
33544bf4 WD |
1808 | if (len > (int)sizeof buf) { |
1809 | rprintf(FERROR, "io_printf() was too long for the buffer.\n"); | |
1810 | exit_cleanup(RERR_STREAMIO); | |
1811 | } | |
1812 | ||
f0fca04e AT |
1813 | write_sbuf(fd, buf); |
1814 | } | |
8d9dc9f9 | 1815 | |
d17e1dd2 | 1816 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1817 | void io_start_multiplex_out(void) |
8d9dc9f9 | 1818 | { |
d17e1dd2 | 1819 | io_flush(NORMAL_FLUSH); |
8ef246e0 | 1820 | io_start_buffering_out(sock_f_out); |
8d9dc9f9 AT |
1821 | io_multiplexing_out = 1; |
1822 | } | |
1823 | ||
d17e1dd2 | 1824 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
1f75bb10 | 1825 | void io_start_multiplex_in(void) |
8d9dc9f9 | 1826 | { |
d17e1dd2 | 1827 | io_flush(NORMAL_FLUSH); |
8ef246e0 | 1828 | io_start_buffering_in(sock_f_in); |
8d9dc9f9 AT |
1829 | io_multiplexing_in = 1; |
1830 | } | |
1831 | ||
d17e1dd2 | 1832 | /** Write an message to the multiplexed data stream. */ |
332cf6df | 1833 | int io_multiplex_write(enum msgcode code, const char *buf, size_t len, int convert) |
8d9dc9f9 | 1834 | { |
f89b9368 WD |
1835 | if (!io_multiplexing_out) |
1836 | return 0; | |
d17e1dd2 | 1837 | io_flush(NORMAL_FLUSH); |
1b7c47cb | 1838 | stats.total_written += (len+4); |
332cf6df | 1839 | mplex_write(sock_f_out, code, buf, len, convert); |
8d9dc9f9 AT |
1840 | return 1; |
1841 | } | |
1842 | ||
8ef246e0 | 1843 | void io_end_multiplex_in(void) |
7f459268 WD |
1844 | { |
1845 | io_multiplexing_in = 0; | |
8ef246e0 | 1846 | io_end_buffering_in(); |
7f459268 WD |
1847 | } |
1848 | ||
d17e1dd2 | 1849 | /** Stop output multiplexing. */ |
8ef246e0 | 1850 | void io_end_multiplex_out(void) |
554e0a8d AT |
1851 | { |
1852 | io_multiplexing_out = 0; | |
8ef246e0 | 1853 | io_end_buffering_out(); |
554e0a8d AT |
1854 | } |
1855 | ||
b9f592fb WD |
1856 | void start_write_batch(int fd) |
1857 | { | |
1858 | /* Some communication has already taken place, but we don't | |
1859 | * enable batch writing until here so that we can write a | |
1860 | * canonical record of the communication even though the | |
1861 | * actual communication so far depends on whether a daemon | |
1862 | * is involved. */ | |
1863 | write_int(batch_fd, protocol_version); | |
71456d30 WD |
1864 | if (protocol_version >= 30) |
1865 | write_byte(batch_fd, inc_recurse); | |
b9f592fb | 1866 | write_int(batch_fd, checksum_seed); |
b9f592fb WD |
1867 | |
1868 | if (am_sender) | |
1869 | write_batch_monitor_out = fd; | |
1870 | else | |
1871 | write_batch_monitor_in = fd; | |
1872 | } | |
1873 | ||
1874 | void stop_write_batch(void) | |
1875 | { | |
1876 | write_batch_monitor_out = -1; | |
1877 | write_batch_monitor_in = -1; | |
1878 | } |